+++ /dev/null
-/*
- * EDMA3 support for DaVinci
- *
- * Copyright (C) 2006-2009 Texas Instruments.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-#include <linux/err.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/interrupt.h>
-#include <linux/platform_device.h>
-#include <linux/io.h>
-#include <linux/slab.h>
-#include <linux/edma.h>
-#include <linux/dma-mapping.h>
-#include <linux/of_address.h>
-#include <linux/of_device.h>
-#include <linux/of_irq.h>
-#include <linux/pm_runtime.h>
-
-#include <linux/platform_data/edma.h>
-
-/* Offsets matching "struct edmacc_param" */
-#define PARM_OPT 0x00
-#define PARM_SRC 0x04
-#define PARM_A_B_CNT 0x08
-#define PARM_DST 0x0c
-#define PARM_SRC_DST_BIDX 0x10
-#define PARM_LINK_BCNTRLD 0x14
-#define PARM_SRC_DST_CIDX 0x18
-#define PARM_CCNT 0x1c
-
-#define PARM_SIZE 0x20
-
-/* Offsets for EDMA CC global channel registers and their shadows */
-#define SH_ER 0x00 /* 64 bits */
-#define SH_ECR 0x08 /* 64 bits */
-#define SH_ESR 0x10 /* 64 bits */
-#define SH_CER 0x18 /* 64 bits */
-#define SH_EER 0x20 /* 64 bits */
-#define SH_EECR 0x28 /* 64 bits */
-#define SH_EESR 0x30 /* 64 bits */
-#define SH_SER 0x38 /* 64 bits */
-#define SH_SECR 0x40 /* 64 bits */
-#define SH_IER 0x50 /* 64 bits */
-#define SH_IECR 0x58 /* 64 bits */
-#define SH_IESR 0x60 /* 64 bits */
-#define SH_IPR 0x68 /* 64 bits */
-#define SH_ICR 0x70 /* 64 bits */
-#define SH_IEVAL 0x78
-#define SH_QER 0x80
-#define SH_QEER 0x84
-#define SH_QEECR 0x88
-#define SH_QEESR 0x8c
-#define SH_QSER 0x90
-#define SH_QSECR 0x94
-#define SH_SIZE 0x200
-
-/* Offsets for EDMA CC global registers */
-#define EDMA_REV 0x0000
-#define EDMA_CCCFG 0x0004
-#define EDMA_QCHMAP 0x0200 /* 8 registers */
-#define EDMA_DMAQNUM 0x0240 /* 8 registers (4 on OMAP-L1xx) */
-#define EDMA_QDMAQNUM 0x0260
-#define EDMA_QUETCMAP 0x0280
-#define EDMA_QUEPRI 0x0284
-#define EDMA_EMR 0x0300 /* 64 bits */
-#define EDMA_EMCR 0x0308 /* 64 bits */
-#define EDMA_QEMR 0x0310
-#define EDMA_QEMCR 0x0314
-#define EDMA_CCERR 0x0318
-#define EDMA_CCERRCLR 0x031c
-#define EDMA_EEVAL 0x0320
-#define EDMA_DRAE 0x0340 /* 4 x 64 bits*/
-#define EDMA_QRAE 0x0380 /* 4 registers */
-#define EDMA_QUEEVTENTRY 0x0400 /* 2 x 16 registers */
-#define EDMA_QSTAT 0x0600 /* 2 registers */
-#define EDMA_QWMTHRA 0x0620
-#define EDMA_QWMTHRB 0x0624
-#define EDMA_CCSTAT 0x0640
-
-#define EDMA_M 0x1000 /* global channel registers */
-#define EDMA_ECR 0x1008
-#define EDMA_ECRH 0x100C
-#define EDMA_SHADOW0 0x2000 /* 4 regions shadowing global channels */
-#define EDMA_PARM 0x4000 /* 128 param entries */
-
-#define PARM_OFFSET(param_no) (EDMA_PARM + ((param_no) << 5))
-
-#define EDMA_DCHMAP 0x0100 /* 64 registers */
-
-/* CCCFG register */
-#define GET_NUM_DMACH(x) (x & 0x7) /* bits 0-2 */
-#define GET_NUM_PAENTRY(x) ((x & 0x7000) >> 12) /* bits 12-14 */
-#define GET_NUM_EVQUE(x) ((x & 0x70000) >> 16) /* bits 16-18 */
-#define GET_NUM_REGN(x) ((x & 0x300000) >> 20) /* bits 20-21 */
-#define CHMAP_EXIST BIT(24)
-
-#define EDMA_MAX_DMACH 64
-#define EDMA_MAX_PARAMENTRY 512
-
-/*****************************************************************************/
-struct edma {
- struct device *dev;
- void __iomem *base;
-
- /* how many dma resources of each type */
- unsigned num_channels;
- unsigned num_region;
- unsigned num_slots;
- unsigned num_tc;
- enum dma_event_q default_queue;
-
- /* list of channels with no even trigger; terminated by "-1" */
- const s8 *noevent;
-
- struct edma_soc_info *info;
- int id;
- bool unused_chan_list_done;
- /* The edma_inuse bit for each PaRAM slot is clear unless the
- * channel is in use ... by ARM or DSP, for QDMA, or whatever.
- */
- DECLARE_BITMAP(edma_inuse, EDMA_MAX_PARAMENTRY);
-
- /* The edma_unused bit for each channel is clear unless
- * it is not being used on this platform. It uses a bit
- * of SOC-specific initialization code.
- */
- DECLARE_BITMAP(edma_unused, EDMA_MAX_DMACH);
-
- struct dma_interrupt_data {
- void (*callback)(unsigned channel, unsigned short ch_status,
- void *data);
- void *data;
- } intr_data[EDMA_MAX_DMACH];
-};
-/*****************************************************************************/
-
-static inline unsigned int edma_read(struct edma *cc, int offset)
-{
- return (unsigned int)__raw_readl(cc->base + offset);
-}
-
-static inline void edma_write(struct edma *cc, int offset, int val)
-{
- __raw_writel(val, cc->base + offset);
-}
-static inline void edma_modify(struct edma *cc, int offset, unsigned and,
- unsigned or)
-{
- unsigned val = edma_read(cc, offset);
- val &= and;
- val |= or;
- edma_write(cc, offset, val);
-}
-static inline void edma_and(struct edma *cc, int offset, unsigned and)
-{
- unsigned val = edma_read(cc, offset);
- val &= and;
- edma_write(cc, offset, val);
-}
-static inline void edma_or(struct edma *cc, int offset, unsigned or)
-{
- unsigned val = edma_read(cc, offset);
- val |= or;
- edma_write(cc, offset, val);
-}
-static inline unsigned int edma_read_array(struct edma *cc, int offset, int i)
-{
- return edma_read(cc, offset + (i << 2));
-}
-static inline void edma_write_array(struct edma *cc, int offset, int i,
- unsigned val)
-{
- edma_write(cc, offset + (i << 2), val);
-}
-static inline void edma_modify_array(struct edma *cc, int offset, int i,
- unsigned and, unsigned or)
-{
- edma_modify(cc, offset + (i << 2), and, or);
-}
-static inline void edma_or_array(struct edma *cc, int offset, int i, unsigned or)
-{
- edma_or(cc, offset + (i << 2), or);
-}
-static inline void edma_or_array2(struct edma *cc, int offset, int i, int j,
- unsigned or)
-{
- edma_or(cc, offset + ((i*2 + j) << 2), or);
-}
-static inline void edma_write_array2(struct edma *cc, int offset, int i, int j,
- unsigned val)
-{
- edma_write(cc, offset + ((i*2 + j) << 2), val);
-}
-static inline unsigned int edma_shadow0_read(struct edma *cc, int offset)
-{
- return edma_read(cc, EDMA_SHADOW0 + offset);
-}
-static inline unsigned int edma_shadow0_read_array(struct edma *cc, int offset,
- int i)
-{
- return edma_read(cc, EDMA_SHADOW0 + offset + (i << 2));
-}
-static inline void edma_shadow0_write(struct edma *cc, int offset, unsigned val)
-{
- edma_write(cc, EDMA_SHADOW0 + offset, val);
-}
-static inline void edma_shadow0_write_array(struct edma *cc, int offset, int i,
- unsigned val)
-{
- edma_write(cc, EDMA_SHADOW0 + offset + (i << 2), val);
-}
-static inline unsigned int edma_parm_read(struct edma *cc, int offset,
- int param_no)
-{
- return edma_read(cc, EDMA_PARM + offset + (param_no << 5));
-}
-static inline void edma_parm_write(struct edma *cc, int offset, int param_no,
- unsigned val)
-{
- edma_write(cc, EDMA_PARM + offset + (param_no << 5), val);
-}
-static inline void edma_parm_modify(struct edma *cc, int offset, int param_no,
- unsigned and, unsigned or)
-{
- edma_modify(cc, EDMA_PARM + offset + (param_no << 5), and, or);
-}
-static inline void edma_parm_and(struct edma *cc, int offset, int param_no,
- unsigned and)
-{
- edma_and(cc, EDMA_PARM + offset + (param_no << 5), and);
-}
-static inline void edma_parm_or(struct edma *cc, int offset, int param_no,
- unsigned or)
-{
- edma_or(cc, EDMA_PARM + offset + (param_no << 5), or);
-}
-
-static inline void set_bits(int offset, int len, unsigned long *p)
-{
- for (; len > 0; len--)
- set_bit(offset + (len - 1), p);
-}
-
-static inline void clear_bits(int offset, int len, unsigned long *p)
-{
- for (; len > 0; len--)
- clear_bit(offset + (len - 1), p);
-}
-
-/*****************************************************************************/
-static int arch_num_cc;
-
-/* dummy param set used to (re)initialize parameter RAM slots */
-static const struct edmacc_param dummy_paramset = {
- .link_bcntrld = 0xffff,
- .ccnt = 1,
-};
-
-static const struct of_device_id edma_of_ids[] = {
- { .compatible = "ti,edma3", },
- {}
-};
-
-/*****************************************************************************/
-
-static void map_dmach_queue(struct edma *cc, unsigned ch_no,
- enum dma_event_q queue_no)
-{
- int bit = (ch_no & 0x7) * 4;
-
- /* default to low priority queue */
- if (queue_no == EVENTQ_DEFAULT)
- queue_no = cc->default_queue;
-
- queue_no &= 7;
- edma_modify_array(cc, EDMA_DMAQNUM, (ch_no >> 3),
- ~(0x7 << bit), queue_no << bit);
-}
-
-static void assign_priority_to_queue(struct edma *cc, int queue_no,
- int priority)
-{
- int bit = queue_no * 4;
- edma_modify(cc, EDMA_QUEPRI, ~(0x7 << bit), ((priority & 0x7) << bit));
-}
-
-/**
- * map_dmach_param - Maps channel number to param entry number
- *
- * This maps the dma channel number to param entry numberter. In
- * other words using the DMA channel mapping registers a param entry
- * can be mapped to any channel
- *
- * Callers are responsible for ensuring the channel mapping logic is
- * included in that particular EDMA variant (Eg : dm646x)
- *
- */
-static void map_dmach_param(struct edma *cc)
-{
- int i;
- for (i = 0; i < EDMA_MAX_DMACH; i++)
- edma_write_array(cc, EDMA_DCHMAP , i , (i << 5));
-}
-
-static inline void setup_dma_interrupt(struct edma *cc, unsigned lch,
- void (*callback)(unsigned channel, u16 ch_status, void *data),
- void *data)
-{
- lch = EDMA_CHAN_SLOT(lch);
-
- if (!callback)
- edma_shadow0_write_array(cc, SH_IECR, lch >> 5,
- BIT(lch & 0x1f));
-
- cc->intr_data[lch].callback = callback;
- cc->intr_data[lch].data = data;
-
- if (callback) {
- edma_shadow0_write_array(cc, SH_ICR, lch >> 5, BIT(lch & 0x1f));
- edma_shadow0_write_array(cc, SH_IESR, lch >> 5,
- BIT(lch & 0x1f));
- }
-}
-
-/******************************************************************************
- *
- * DMA interrupt handler
- *
- *****************************************************************************/
-static irqreturn_t dma_irq_handler(int irq, void *data)
-{
- struct edma *cc = data;
- int ctlr;
- u32 sh_ier;
- u32 sh_ipr;
- u32 bank;
-
- ctlr = cc->id;
- if (ctlr < 0)
- return IRQ_NONE;
-
- dev_dbg(cc->dev, "dma_irq_handler\n");
-
- sh_ipr = edma_shadow0_read_array(cc, SH_IPR, 0);
- if (!sh_ipr) {
- sh_ipr = edma_shadow0_read_array(cc, SH_IPR, 1);
- if (!sh_ipr)
- return IRQ_NONE;
- sh_ier = edma_shadow0_read_array(cc, SH_IER, 1);
- bank = 1;
- } else {
- sh_ier = edma_shadow0_read_array(cc, SH_IER, 0);
- bank = 0;
- }
-
- do {
- u32 slot;
- u32 channel;
-
- dev_dbg(cc->dev, "IPR%d %08x\n", bank, sh_ipr);
-
- slot = __ffs(sh_ipr);
- sh_ipr &= ~(BIT(slot));
-
- if (sh_ier & BIT(slot)) {
- channel = (bank << 5) | slot;
- /* Clear the corresponding IPR bits */
- edma_shadow0_write_array(cc, SH_ICR, bank, BIT(slot));
- if (cc->intr_data[channel].callback)
- cc->intr_data[channel].callback(
- EDMA_CTLR_CHAN(ctlr, channel),
- EDMA_DMA_COMPLETE,
- cc->intr_data[channel].data);
- }
- } while (sh_ipr);
-
- edma_shadow0_write(cc, SH_IEVAL, 1);
- return IRQ_HANDLED;
-}
-
-/******************************************************************************
- *
- * DMA error interrupt handler
- *
- *****************************************************************************/
-static irqreturn_t dma_ccerr_handler(int irq, void *data)
-{
- struct edma *cc = data;
- int i;
- int ctlr;
- unsigned int cnt = 0;
-
- ctlr = cc->id;
- if (ctlr < 0)
- return IRQ_NONE;
-
- dev_dbg(cc->dev, "dma_ccerr_handler\n");
-
- if ((edma_read_array(cc, EDMA_EMR, 0) == 0) &&
- (edma_read_array(cc, EDMA_EMR, 1) == 0) &&
- (edma_read(cc, EDMA_QEMR) == 0) &&
- (edma_read(cc, EDMA_CCERR) == 0))
- return IRQ_NONE;
-
- while (1) {
- int j = -1;
- if (edma_read_array(cc, EDMA_EMR, 0))
- j = 0;
- else if (edma_read_array(cc, EDMA_EMR, 1))
- j = 1;
- if (j >= 0) {
- dev_dbg(cc->dev, "EMR%d %08x\n", j,
- edma_read_array(cc, EDMA_EMR, j));
- for (i = 0; i < 32; i++) {
- int k = (j << 5) + i;
- if (edma_read_array(cc, EDMA_EMR, j) &
- BIT(i)) {
- /* Clear the corresponding EMR bits */
- edma_write_array(cc, EDMA_EMCR, j,
- BIT(i));
- /* Clear any SER */
- edma_shadow0_write_array(cc, SH_SECR,
- j, BIT(i));
- if (cc->intr_data[k].callback) {
- cc->intr_data[k].callback(
- EDMA_CTLR_CHAN(ctlr, k),
- EDMA_DMA_CC_ERROR,
- cc->intr_data[k].data);
- }
- }
- }
- } else if (edma_read(cc, EDMA_QEMR)) {
- dev_dbg(cc->dev, "QEMR %02x\n",
- edma_read(cc, EDMA_QEMR));
- for (i = 0; i < 8; i++) {
- if (edma_read(cc, EDMA_QEMR) & BIT(i)) {
- /* Clear the corresponding IPR bits */
- edma_write(cc, EDMA_QEMCR, BIT(i));
- edma_shadow0_write(cc, SH_QSECR,
- BIT(i));
-
- /* NOTE: not reported!! */
- }
- }
- } else if (edma_read(cc, EDMA_CCERR)) {
- dev_dbg(cc->dev, "CCERR %08x\n",
- edma_read(cc, EDMA_CCERR));
- /* FIXME: CCERR.BIT(16) ignored! much better
- * to just write CCERRCLR with CCERR value...
- */
- for (i = 0; i < 8; i++) {
- if (edma_read(cc, EDMA_CCERR) & BIT(i)) {
- /* Clear the corresponding IPR bits */
- edma_write(cc, EDMA_CCERRCLR, BIT(i));
-
- /* NOTE: not reported!! */
- }
- }
- }
- if ((edma_read_array(cc, EDMA_EMR, 0) == 0) &&
- (edma_read_array(cc, EDMA_EMR, 1) == 0) &&
- (edma_read(cc, EDMA_QEMR) == 0) &&
- (edma_read(cc, EDMA_CCERR) == 0))
- break;
- cnt++;
- if (cnt > 10)
- break;
- }
- edma_write(cc, EDMA_EEVAL, 1);
- return IRQ_HANDLED;
-}
-
-static int prepare_unused_channel_list(struct device *dev, void *data)
-{
- struct platform_device *pdev = to_platform_device(dev);
- struct edma *cc = data;
- int i, count;
- struct of_phandle_args dma_spec;
-
- if (dev->of_node) {
- struct platform_device *dma_pdev;
-
- count = of_property_count_strings(dev->of_node, "dma-names");
- if (count < 0)
- return 0;
- for (i = 0; i < count; i++) {
-
- if (of_parse_phandle_with_args(dev->of_node, "dmas",
- "#dma-cells", i,
- &dma_spec))
- continue;
-
- if (!of_match_node(edma_of_ids, dma_spec.np)) {
- of_node_put(dma_spec.np);
- continue;
- }
-
- dma_pdev = of_find_device_by_node(dma_spec.np);
- if (&dma_pdev->dev != cc->dev)
- continue;
-
- clear_bit(EDMA_CHAN_SLOT(dma_spec.args[0]),
- cc->edma_unused);
- of_node_put(dma_spec.np);
- }
- return 0;
- }
-
- /* For non-OF case */
- for (i = 0; i < pdev->num_resources; i++) {
- struct resource *res = &pdev->resource[i];
-
- if ((res->flags & IORESOURCE_DMA) && (int)res->start >= 0) {
- clear_bit(EDMA_CHAN_SLOT(pdev->resource[i].start),
- cc->edma_unused);
- }
- }
-
- return 0;
-}
-
-/*-----------------------------------------------------------------------*/
-
-/* Resource alloc/free: dma channels, parameter RAM slots */
-
-/**
- * edma_alloc_channel - allocate DMA channel and paired parameter RAM
- * @channel: specific channel to allocate; negative for "any unmapped channel"
- * @callback: optional; to be issued on DMA completion or errors
- * @data: passed to callback
- * @eventq_no: an EVENTQ_* constant, used to choose which Transfer
- * Controller (TC) executes requests using this channel. Use
- * EVENTQ_DEFAULT unless you really need a high priority queue.
- *
- * This allocates a DMA channel and its associated parameter RAM slot.
- * The parameter RAM is initialized to hold a dummy transfer.
- *
- * Normal use is to pass a specific channel number as @channel, to make
- * use of hardware events mapped to that channel. When the channel will
- * be used only for software triggering or event chaining, channels not
- * mapped to hardware events (or mapped to unused events) are preferable.
- *
- * DMA transfers start from a channel using edma_start(), or by
- * chaining. When the transfer described in that channel's parameter RAM
- * slot completes, that slot's data may be reloaded through a link.
- *
- * DMA errors are only reported to the @callback associated with the
- * channel driving that transfer, but transfer completion callbacks can
- * be sent to another channel under control of the TCC field in
- * the option word of the transfer's parameter RAM set. Drivers must not
- * use DMA transfer completion callbacks for channels they did not allocate.
- * (The same applies to TCC codes used in transfer chaining.)
- *
- * Returns the number of the channel, else negative errno.
- */
-int edma_alloc_channel(struct edma *cc, int channel,
- void (*callback)(unsigned channel, u16 ch_status, void *data),
- void *data,
- enum dma_event_q eventq_no)
-{
- unsigned done = 0;
- int ret = 0;
-
- if (!cc->unused_chan_list_done) {
- /*
- * Scan all the platform devices to find out the EDMA channels
- * used and clear them in the unused list, making the rest
- * available for ARM usage.
- */
- ret = bus_for_each_dev(&platform_bus_type, NULL, cc,
- prepare_unused_channel_list);
- if (ret < 0)
- return ret;
-
- cc->unused_chan_list_done = true;
- }
-
- if (channel >= 0) {
- if (cc->id != EDMA_CTLR(channel)) {
- dev_err(cc->dev, "%s: ID mismatch for eDMA%d: %d\n",
- __func__, cc->id, EDMA_CTLR(channel));
- return -EINVAL;
- }
- channel = EDMA_CHAN_SLOT(channel);
- }
-
- if (channel < 0) {
- channel = 0;
- for (;;) {
- channel = find_next_bit(cc->edma_unused,
- cc->num_channels, channel);
- if (channel == cc->num_channels)
- break;
- if (!test_and_set_bit(channel, cc->edma_inuse)) {
- done = 1;
- break;
- }
- channel++;
- }
- if (!done)
- return -ENOMEM;
- } else if (channel >= cc->num_channels) {
- return -EINVAL;
- } else if (test_and_set_bit(channel, cc->edma_inuse)) {
- return -EBUSY;
- }
-
- /* ensure access through shadow region 0 */
- edma_or_array2(cc, EDMA_DRAE, 0, channel >> 5, BIT(channel & 0x1f));
-
- /* ensure no events are pending */
- edma_stop(cc, EDMA_CTLR_CHAN(cc->id, channel));
- memcpy_toio(cc->base + PARM_OFFSET(channel), &dummy_paramset,
- PARM_SIZE);
-
- if (callback)
- setup_dma_interrupt(cc, EDMA_CTLR_CHAN(cc->id, channel),
- callback, data);
-
- map_dmach_queue(cc, channel, eventq_no);
-
- return EDMA_CTLR_CHAN(cc->id, channel);
-}
-EXPORT_SYMBOL(edma_alloc_channel);
-
-
-/**
- * edma_free_channel - deallocate DMA channel
- * @channel: dma channel returned from edma_alloc_channel()
- *
- * This deallocates the DMA channel and associated parameter RAM slot
- * allocated by edma_alloc_channel().
- *
- * Callers are responsible for ensuring the channel is inactive, and
- * will not be reactivated by linking, chaining, or software calls to
- * edma_start().
- */
-void edma_free_channel(struct edma *cc, unsigned channel)
-{
-
- if (cc->id != EDMA_CTLR(channel)) {
- dev_err(cc->dev, "%s: ID mismatch for eDMA%d: %d\n", __func__,
- cc->id, EDMA_CTLR(channel));
- return;
- }
- channel = EDMA_CHAN_SLOT(channel);
-
- if (channel >= cc->num_channels)
- return;
-
- setup_dma_interrupt(cc, channel, NULL, NULL);
- /* REVISIT should probably take out of shadow region 0 */
-
- memcpy_toio(cc->base + PARM_OFFSET(channel), &dummy_paramset,
- PARM_SIZE);
- clear_bit(channel, cc->edma_inuse);
-}
-EXPORT_SYMBOL(edma_free_channel);
-
-/**
- * edma_alloc_slot - allocate DMA parameter RAM
- * @slot: specific slot to allocate; negative for "any unused slot"
- *
- * This allocates a parameter RAM slot, initializing it to hold a
- * dummy transfer. Slots allocated using this routine have not been
- * mapped to a hardware DMA channel, and will normally be used by
- * linking to them from a slot associated with a DMA channel.
- *
- * Normal use is to pass EDMA_SLOT_ANY as the @slot, but specific
- * slots may be allocated on behalf of DSP firmware.
- *
- * Returns the number of the slot, else negative errno.
- */
-int edma_alloc_slot(struct edma *cc, int slot)
-{
- if (slot > 0)
- slot = EDMA_CHAN_SLOT(slot);
- if (slot < 0) {
- slot = cc->num_channels;
- for (;;) {
- slot = find_next_zero_bit(cc->edma_inuse, cc->num_slots,
- slot);
- if (slot == cc->num_slots)
- return -ENOMEM;
- if (!test_and_set_bit(slot, cc->edma_inuse))
- break;
- }
- } else if (slot < cc->num_channels || slot >= cc->num_slots) {
- return -EINVAL;
- } else if (test_and_set_bit(slot, cc->edma_inuse)) {
- return -EBUSY;
- }
-
- memcpy_toio(cc->base + PARM_OFFSET(slot), &dummy_paramset, PARM_SIZE);
-
- return slot;
-}
-EXPORT_SYMBOL(edma_alloc_slot);
-
-/**
- * edma_free_slot - deallocate DMA parameter RAM
- * @slot: parameter RAM slot returned from edma_alloc_slot()
- *
- * This deallocates the parameter RAM slot allocated by edma_alloc_slot().
- * Callers are responsible for ensuring the slot is inactive, and will
- * not be activated.
- */
-void edma_free_slot(struct edma *cc, unsigned slot)
-{
-
- slot = EDMA_CHAN_SLOT(slot);
- if (slot < cc->num_channels || slot >= cc->num_slots)
- return;
-
- memcpy_toio(cc->base + PARM_OFFSET(slot), &dummy_paramset, PARM_SIZE);
- clear_bit(slot, cc->edma_inuse);
-}
-EXPORT_SYMBOL(edma_free_slot);
-
-/*-----------------------------------------------------------------------*/
-
-/* Parameter RAM operations (i) -- read/write partial slots */
-
-/**
- * edma_get_position - returns the current transfer point
- * @slot: parameter RAM slot being examined
- * @dst: true selects the dest position, false the source
- *
- * Returns the position of the current active slot
- */
-dma_addr_t edma_get_position(struct edma *cc, unsigned slot, bool dst)
-{
- u32 offs;
-
- slot = EDMA_CHAN_SLOT(slot);
- offs = PARM_OFFSET(slot);
- offs += dst ? PARM_DST : PARM_SRC;
-
- return edma_read(cc, offs);
-}
-
-/**
- * edma_link - link one parameter RAM slot to another
- * @from: parameter RAM slot originating the link
- * @to: parameter RAM slot which is the link target
- *
- * The originating slot should not be part of any active DMA transfer.
- */
-void edma_link(struct edma *cc, unsigned from, unsigned to)
-{
- from = EDMA_CHAN_SLOT(from);
- to = EDMA_CHAN_SLOT(to);
- if (from >= cc->num_slots || to >= cc->num_slots)
- return;
-
- edma_parm_modify(cc, PARM_LINK_BCNTRLD, from, 0xffff0000,
- PARM_OFFSET(to));
-}
-EXPORT_SYMBOL(edma_link);
-
-/*-----------------------------------------------------------------------*/
-
-/* Parameter RAM operations (ii) -- read/write whole parameter sets */
-
-/**
- * edma_write_slot - write parameter RAM data for slot
- * @slot: number of parameter RAM slot being modified
- * @param: data to be written into parameter RAM slot
- *
- * Use this to assign all parameters of a transfer at once. This
- * allows more efficient setup of transfers than issuing multiple
- * calls to set up those parameters in small pieces, and provides
- * complete control over all transfer options.
- */
-void edma_write_slot(struct edma *cc, unsigned slot,
- const struct edmacc_param *param)
-{
- slot = EDMA_CHAN_SLOT(slot);
- if (slot >= cc->num_slots)
- return;
- memcpy_toio(cc->base + PARM_OFFSET(slot), param, PARM_SIZE);
-}
-EXPORT_SYMBOL(edma_write_slot);
-
-/**
- * edma_read_slot - read parameter RAM data from slot
- * @slot: number of parameter RAM slot being copied
- * @param: where to store copy of parameter RAM data
- *
- * Use this to read data from a parameter RAM slot, perhaps to
- * save them as a template for later reuse.
- */
-void edma_read_slot(struct edma *cc, unsigned slot, struct edmacc_param *param)
-{
- slot = EDMA_CHAN_SLOT(slot);
- if (slot >= cc->num_slots)
- return;
- memcpy_fromio(param, cc->base + PARM_OFFSET(slot), PARM_SIZE);
-}
-EXPORT_SYMBOL(edma_read_slot);
-
-/*-----------------------------------------------------------------------*/
-
-/* Various EDMA channel control operations */
-
-/**
- * edma_pause - pause dma on a channel
- * @channel: on which edma_start() has been called
- *
- * This temporarily disables EDMA hardware events on the specified channel,
- * preventing them from triggering new transfers on its behalf
- */
-void edma_pause(struct edma *cc, unsigned channel)
-{
- if (cc->id != EDMA_CTLR(channel)) {
- dev_err(cc->dev, "%s: ID mismatch for eDMA%d: %d\n", __func__,
- cc->id, EDMA_CTLR(channel));
- return;
- }
- channel = EDMA_CHAN_SLOT(channel);
-
- if (channel < cc->num_channels) {
- unsigned int mask = BIT(channel & 0x1f);
-
- edma_shadow0_write_array(cc, SH_EECR, channel >> 5, mask);
- }
-}
-EXPORT_SYMBOL(edma_pause);
-
-/**
- * edma_resume - resumes dma on a paused channel
- * @channel: on which edma_pause() has been called
- *
- * This re-enables EDMA hardware events on the specified channel.
- */
-void edma_resume(struct edma *cc, unsigned channel)
-{
- if (cc->id != EDMA_CTLR(channel)) {
- dev_err(cc->dev, "%s: ID mismatch for eDMA%d: %d\n", __func__,
- cc->id, EDMA_CTLR(channel));
- return;
- }
- channel = EDMA_CHAN_SLOT(channel);
-
- if (channel < cc->num_channels) {
- unsigned int mask = BIT(channel & 0x1f);
-
- edma_shadow0_write_array(cc, SH_EESR, channel >> 5, mask);
- }
-}
-EXPORT_SYMBOL(edma_resume);
-
-int edma_trigger_channel(struct edma *cc, unsigned channel)
-{
- unsigned int mask;
-
- if (cc->id != EDMA_CTLR(channel)) {
- dev_err(cc->dev, "%s: ID mismatch for eDMA%d: %d\n", __func__,
- cc->id, EDMA_CTLR(channel));
- return -EINVAL;
- }
- channel = EDMA_CHAN_SLOT(channel);
- mask = BIT(channel & 0x1f);
-
- edma_shadow0_write_array(cc, SH_ESR, (channel >> 5), mask);
-
- pr_debug("EDMA: ESR%d %08x\n", (channel >> 5),
- edma_shadow0_read_array(cc, SH_ESR, (channel >> 5)));
- return 0;
-}
-EXPORT_SYMBOL(edma_trigger_channel);
-
-/**
- * edma_start - start dma on a channel
- * @channel: channel being activated
- *
- * Channels with event associations will be triggered by their hardware
- * events, and channels without such associations will be triggered by
- * software. (At this writing there is no interface for using software
- * triggers except with channels that don't support hardware triggers.)
- *
- * Returns zero on success, else negative errno.
- */
-int edma_start(struct edma *cc, unsigned channel)
-{
- if (cc->id != EDMA_CTLR(channel)) {
- dev_err(cc->dev, "%s: ID mismatch for eDMA%d: %d\n", __func__,
- cc->id, EDMA_CTLR(channel));
- return -EINVAL;
- }
- channel = EDMA_CHAN_SLOT(channel);
-
- if (channel < cc->num_channels) {
- int j = channel >> 5;
- unsigned int mask = BIT(channel & 0x1f);
-
- /* EDMA channels without event association */
- if (test_bit(channel, cc->edma_unused)) {
- pr_debug("EDMA: ESR%d %08x\n", j,
- edma_shadow0_read_array(cc, SH_ESR, j));
- edma_shadow0_write_array(cc, SH_ESR, j, mask);
- return 0;
- }
-
- /* EDMA channel with event association */
- pr_debug("EDMA: ER%d %08x\n", j,
- edma_shadow0_read_array(cc, SH_ER, j));
- /* Clear any pending event or error */
- edma_write_array(cc, EDMA_ECR, j, mask);
- edma_write_array(cc, EDMA_EMCR, j, mask);
- /* Clear any SER */
- edma_shadow0_write_array(cc, SH_SECR, j, mask);
- edma_shadow0_write_array(cc, SH_EESR, j, mask);
- pr_debug("EDMA: EER%d %08x\n", j,
- edma_shadow0_read_array(cc, SH_EER, j));
- return 0;
- }
-
- return -EINVAL;
-}
-EXPORT_SYMBOL(edma_start);
-
-/**
- * edma_stop - stops dma on the channel passed
- * @channel: channel being deactivated
- *
- * When @lch is a channel, any active transfer is paused and
- * all pending hardware events are cleared. The current transfer
- * may not be resumed, and the channel's Parameter RAM should be
- * reinitialized before being reused.
- */
-void edma_stop(struct edma *cc, unsigned channel)
-{
- if (cc->id != EDMA_CTLR(channel)) {
- dev_err(cc->dev, "%s: ID mismatch for eDMA%d: %d\n", __func__,
- cc->id, EDMA_CTLR(channel));
- return;
- }
- channel = EDMA_CHAN_SLOT(channel);
-
- if (channel < cc->num_channels) {
- int j = channel >> 5;
- unsigned int mask = BIT(channel & 0x1f);
-
- edma_shadow0_write_array(cc, SH_EECR, j, mask);
- edma_shadow0_write_array(cc, SH_ECR, j, mask);
- edma_shadow0_write_array(cc, SH_SECR, j, mask);
- edma_write_array(cc, EDMA_EMCR, j, mask);
-
- /* clear possibly pending completion interrupt */
- edma_shadow0_write_array(cc, SH_ICR, j, mask);
-
- pr_debug("EDMA: EER%d %08x\n", j,
- edma_shadow0_read_array(cc, SH_EER, j));
-
- /* REVISIT: consider guarding against inappropriate event
- * chaining by overwriting with dummy_paramset.
- */
- }
-}
-EXPORT_SYMBOL(edma_stop);
-
-/******************************************************************************
- *
- * It cleans ParamEntry qand bring back EDMA to initial state if media has
- * been removed before EDMA has finished.It is usedful for removable media.
- * Arguments:
- * ch_no - channel no
- *
- * Return: zero on success, or corresponding error no on failure
- *
- * FIXME this should not be needed ... edma_stop() should suffice.
- *
- *****************************************************************************/
-
-void edma_clean_channel(struct edma *cc, unsigned channel)
-{
- if (cc->id != EDMA_CTLR(channel)) {
- dev_err(cc->dev, "%s: ID mismatch for eDMA%d: %d\n", __func__,
- cc->id, EDMA_CTLR(channel));
- return;
- }
- channel = EDMA_CHAN_SLOT(channel);
-
- if (channel < cc->num_channels) {
- int j = (channel >> 5);
- unsigned int mask = BIT(channel & 0x1f);
-
- pr_debug("EDMA: EMR%d %08x\n", j,
- edma_read_array(cc, EDMA_EMR, j));
- edma_shadow0_write_array(cc, SH_ECR, j, mask);
- /* Clear the corresponding EMR bits */
- edma_write_array(cc, EDMA_EMCR, j, mask);
- /* Clear any SER */
- edma_shadow0_write_array(cc, SH_SECR, j, mask);
- edma_write(cc, EDMA_CCERRCLR, BIT(16) | BIT(1) | BIT(0));
- }
-}
-EXPORT_SYMBOL(edma_clean_channel);
-
-/*
- * edma_assign_channel_eventq - move given channel to desired eventq
- * Arguments:
- * channel - channel number
- * eventq_no - queue to move the channel
- *
- * Can be used to move a channel to a selected event queue.
- */
-void edma_assign_channel_eventq(struct edma *cc, unsigned channel,
- enum dma_event_q eventq_no)
-{
- if (cc->id != EDMA_CTLR(channel)) {
- dev_err(cc->dev, "%s: ID mismatch for eDMA%d: %d\n", __func__,
- cc->id, EDMA_CTLR(channel));
- return;
- }
- channel = EDMA_CHAN_SLOT(channel);
-
- if (channel >= cc->num_channels)
- return;
-
- /* default to low priority queue */
- if (eventq_no == EVENTQ_DEFAULT)
- eventq_no = cc->default_queue;
- if (eventq_no >= cc->num_tc)
- return;
-
- map_dmach_queue(cc, channel, eventq_no);
-}
-EXPORT_SYMBOL(edma_assign_channel_eventq);
-
-struct edma *edma_get_data(struct device *edma_dev)
-{
- return dev_get_drvdata(edma_dev);
-}
-
-
-static int edma_setup_from_hw(struct device *dev, struct edma_soc_info *pdata,
- struct edma *edma_cc, int cc_id)
-{
- int i;
- u32 value, cccfg;
- s8 (*queue_priority_map)[2];
-
- /* Decode the eDMA3 configuration from CCCFG register */
- cccfg = edma_read(edma_cc, EDMA_CCCFG);
-
- value = GET_NUM_REGN(cccfg);
- edma_cc->num_region = BIT(value);
-
- value = GET_NUM_DMACH(cccfg);
- edma_cc->num_channels = BIT(value + 1);
-
- value = GET_NUM_PAENTRY(cccfg);
- edma_cc->num_slots = BIT(value + 4);
-
- value = GET_NUM_EVQUE(cccfg);
- edma_cc->num_tc = value + 1;
-
- dev_dbg(dev, "eDMA3 CC%d HW configuration (cccfg: 0x%08x):\n", cc_id,
- cccfg);
- dev_dbg(dev, "num_region: %u\n", edma_cc->num_region);
- dev_dbg(dev, "num_channel: %u\n", edma_cc->num_channels);
- dev_dbg(dev, "num_slot: %u\n", edma_cc->num_slots);
- dev_dbg(dev, "num_tc: %u\n", edma_cc->num_tc);
-
- /* Nothing need to be done if queue priority is provided */
- if (pdata->queue_priority_mapping)
- return 0;
-
- /*
- * Configure TC/queue priority as follows:
- * Q0 - priority 0
- * Q1 - priority 1
- * Q2 - priority 2
- * ...
- * The meaning of priority numbers: 0 highest priority, 7 lowest
- * priority. So Q0 is the highest priority queue and the last queue has
- * the lowest priority.
- */
- queue_priority_map = devm_kzalloc(dev,
- (edma_cc->num_tc + 1) * sizeof(s8),
- GFP_KERNEL);
- if (!queue_priority_map)
- return -ENOMEM;
-
- for (i = 0; i < edma_cc->num_tc; i++) {
- queue_priority_map[i][0] = i;
- queue_priority_map[i][1] = i;
- }
- queue_priority_map[i][0] = -1;
- queue_priority_map[i][1] = -1;
-
- pdata->queue_priority_mapping = queue_priority_map;
- /* Default queue has the lowest priority */
- pdata->default_queue = i - 1;
-
- return 0;
-}
-
-#if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_DMADEVICES)
-
-static int edma_xbar_event_map(struct device *dev, struct device_node *node,
- struct edma_soc_info *pdata, size_t sz)
-{
- const char pname[] = "ti,edma-xbar-event-map";
- struct resource res;
- void __iomem *xbar;
- s16 (*xbar_chans)[2];
- size_t nelm = sz / sizeof(s16);
- u32 shift, offset, mux;
- int ret, i;
-
- xbar_chans = devm_kzalloc(dev, (nelm + 2) * sizeof(s16), GFP_KERNEL);
- if (!xbar_chans)
- return -ENOMEM;
-
- ret = of_address_to_resource(node, 1, &res);
- if (ret)
- return -ENOMEM;
-
- xbar = devm_ioremap(dev, res.start, resource_size(&res));
- if (!xbar)
- return -ENOMEM;
-
- ret = of_property_read_u16_array(node, pname, (u16 *)xbar_chans, nelm);
- if (ret)
- return -EIO;
-
- /* Invalidate last entry for the other user of this mess */
- nelm >>= 1;
- xbar_chans[nelm][0] = xbar_chans[nelm][1] = -1;
-
- for (i = 0; i < nelm; i++) {
- shift = (xbar_chans[i][1] & 0x03) << 3;
- offset = xbar_chans[i][1] & 0xfffffffc;
- mux = readl(xbar + offset);
- mux &= ~(0xff << shift);
- mux |= xbar_chans[i][0] << shift;
- writel(mux, (xbar + offset));
- }
-
- pdata->xbar_chans = (const s16 (*)[2]) xbar_chans;
- return 0;
-}
-
-static int edma_of_parse_dt(struct device *dev,
- struct device_node *node,
- struct edma_soc_info *pdata)
-{
- int ret = 0;
- struct property *prop;
- size_t sz;
- struct edma_rsv_info *rsv_info;
-
- rsv_info = devm_kzalloc(dev, sizeof(struct edma_rsv_info), GFP_KERNEL);
- if (!rsv_info)
- return -ENOMEM;
- pdata->rsv = rsv_info;
-
- prop = of_find_property(node, "ti,edma-xbar-event-map", &sz);
- if (prop)
- ret = edma_xbar_event_map(dev, node, pdata, sz);
-
- return ret;
-}
-
-static struct edma_soc_info *edma_setup_info_from_dt(struct device *dev,
- struct device_node *node)
-{
- struct edma_soc_info *info;
- int ret;
-
- info = devm_kzalloc(dev, sizeof(struct edma_soc_info), GFP_KERNEL);
- if (!info)
- return ERR_PTR(-ENOMEM);
-
- ret = edma_of_parse_dt(dev, node, info);
- if (ret)
- return ERR_PTR(ret);
-
- return info;
-}
-#else
-static struct edma_soc_info *edma_setup_info_from_dt(struct device *dev,
- struct device_node *node)
-{
- return ERR_PTR(-ENOSYS);
-}
-#endif
-
-static int edma_probe(struct platform_device *pdev)
-{
- struct edma_soc_info *info = pdev->dev.platform_data;
- s8 (*queue_priority_mapping)[2];
- int i, off, ln;
- const s16 (*rsv_chans)[2];
- const s16 (*rsv_slots)[2];
- const s16 (*xbar_chans)[2];
- int irq;
- char *irq_name;
- struct resource *mem;
- struct device_node *node = pdev->dev.of_node;
- struct device *dev = &pdev->dev;
- int dev_id = pdev->id;
- struct edma *cc;
- int ret;
- struct platform_device_info edma_dev_info = {
- .name = "edma-dma-engine",
- .dma_mask = DMA_BIT_MASK(32),
- .parent = &pdev->dev,
- };
-
- if (node) {
- info = edma_setup_info_from_dt(dev, node);
- if (IS_ERR(info)) {
- dev_err(dev, "failed to get DT data\n");
- return PTR_ERR(info);
- }
- }
-
- if (!info)
- return -ENODEV;
-
- pm_runtime_enable(dev);
- ret = pm_runtime_get_sync(dev);
- if (ret < 0) {
- dev_err(dev, "pm_runtime_get_sync() failed\n");
- return ret;
- }
-
- mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "edma3_cc");
- if (!mem) {
- dev_dbg(dev, "mem resource not found, using index 0\n");
- mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!mem) {
- dev_err(dev, "no mem resource?\n");
- return -ENODEV;
- }
- }
-
- cc = devm_kzalloc(dev, sizeof(struct edma), GFP_KERNEL);
- if (!cc)
- return -ENOMEM;
-
- cc->dev = dev;
- cc->id = dev_id;
- /* When booting with DT the pdev->id is -1 */
- if (dev_id < 0) {
- cc->id = 0;
- dev_id = arch_num_cc;
- }
- dev_set_drvdata(dev, cc);
-
- cc->base = devm_ioremap_resource(dev, mem);
- if (IS_ERR(cc->base))
- return PTR_ERR(cc->base);
-
- /* Get eDMA3 configuration from IP */
- ret = edma_setup_from_hw(dev, info, cc, dev_id);
- if (ret)
- return ret;
-
- cc->default_queue = info->default_queue;
-
- for (i = 0; i < cc->num_slots; i++)
- memcpy_toio(cc->base + PARM_OFFSET(i), &dummy_paramset,
- PARM_SIZE);
-
- /* Mark all channels as unused */
- memset(cc->edma_unused, 0xff, sizeof(cc->edma_unused));
-
- if (info->rsv) {
-
- /* Clear the reserved channels in unused list */
- rsv_chans = info->rsv->rsv_chans;
- if (rsv_chans) {
- for (i = 0; rsv_chans[i][0] != -1; i++) {
- off = rsv_chans[i][0];
- ln = rsv_chans[i][1];
- clear_bits(off, ln, cc->edma_unused);
- }
- }
-
- /* Set the reserved slots in inuse list */
- rsv_slots = info->rsv->rsv_slots;
- if (rsv_slots) {
- for (i = 0; rsv_slots[i][0] != -1; i++) {
- off = rsv_slots[i][0];
- ln = rsv_slots[i][1];
- set_bits(off, ln, cc->edma_inuse);
- }
- }
- }
-
- /* Clear the xbar mapped channels in unused list */
- xbar_chans = info->xbar_chans;
- if (xbar_chans) {
- for (i = 0; xbar_chans[i][1] != -1; i++) {
- off = xbar_chans[i][1];
- clear_bits(off, 1, cc->edma_unused);
- }
- }
-
- irq = platform_get_irq_byname(pdev, "edma3_ccint");
- if (irq < 0 && node)
- irq = irq_of_parse_and_map(node, 0);
-
- if (irq >= 0) {
- irq_name = devm_kasprintf(dev, GFP_KERNEL, "%s_ccint",
- dev_name(dev));
- ret = devm_request_irq(dev, irq, dma_irq_handler, 0, irq_name,
- cc);
- if (ret) {
- dev_err(dev, "CCINT (%d) failed --> %d\n", irq, ret);
- return ret;
- }
- }
-
- irq = platform_get_irq_byname(pdev, "edma3_ccerrint");
- if (irq < 0 && node)
- irq = irq_of_parse_and_map(node, 2);
-
- if (irq >= 0) {
- irq_name = devm_kasprintf(dev, GFP_KERNEL, "%s_ccerrint",
- dev_name(dev));
- ret = devm_request_irq(dev, irq, dma_ccerr_handler, 0, irq_name,
- cc);
- if (ret) {
- dev_err(dev, "CCERRINT (%d) failed --> %d\n", irq, ret);
- return ret;
- }
- }
-
- for (i = 0; i < cc->num_channels; i++)
- map_dmach_queue(cc, i, info->default_queue);
-
- queue_priority_mapping = info->queue_priority_mapping;
-
- /* Event queue priority mapping */
- for (i = 0; queue_priority_mapping[i][0] != -1; i++)
- assign_priority_to_queue(cc, queue_priority_mapping[i][0],
- queue_priority_mapping[i][1]);
-
- /* Map the channel to param entry if channel mapping logic exist */
- if (edma_read(cc, EDMA_CCCFG) & CHMAP_EXIST)
- map_dmach_param(cc);
-
- for (i = 0; i < cc->num_region; i++) {
- edma_write_array2(cc, EDMA_DRAE, i, 0, 0x0);
- edma_write_array2(cc, EDMA_DRAE, i, 1, 0x0);
- edma_write_array(cc, EDMA_QRAE, i, 0x0);
- }
- cc->info = info;
- arch_num_cc++;
-
- edma_dev_info.id = dev_id;
-
- platform_device_register_full(&edma_dev_info);
-
- return 0;
-}
-
-#ifdef CONFIG_PM_SLEEP
-static int edma_pm_resume(struct device *dev)
-{
- struct edma *cc = dev_get_drvdata(dev);
- int i;
- s8 (*queue_priority_mapping)[2];
-
- queue_priority_mapping = cc->info->queue_priority_mapping;
-
- /* Event queue priority mapping */
- for (i = 0; queue_priority_mapping[i][0] != -1; i++)
- assign_priority_to_queue(cc, queue_priority_mapping[i][0],
- queue_priority_mapping[i][1]);
-
- /* Map the channel to param entry if channel mapping logic */
- if (edma_read(cc, EDMA_CCCFG) & CHMAP_EXIST)
- map_dmach_param(cc);
-
- for (i = 0; i < cc->num_channels; i++) {
- if (test_bit(i, cc->edma_inuse)) {
- /* ensure access through shadow region 0 */
- edma_or_array2(cc, EDMA_DRAE, 0, i >> 5, BIT(i & 0x1f));
-
- setup_dma_interrupt(cc, EDMA_CTLR_CHAN(cc->id, i),
- cc->intr_data[i].callback,
- cc->intr_data[i].data);
- }
- }
-
- return 0;
-}
-#endif
-
-static const struct dev_pm_ops edma_pm_ops = {
- SET_LATE_SYSTEM_SLEEP_PM_OPS(NULL, edma_pm_resume)
-};
-
-static struct platform_driver edma_driver = {
- .driver = {
- .name = "edma",
- .pm = &edma_pm_ops,
- .of_match_table = edma_of_ids,
- },
- .probe = edma_probe,
-};
-
-static int __init edma_init(void)
-{
- return platform_driver_probe(&edma_driver, edma_probe);
-}
-arch_initcall(edma_init);
-
#include <linux/spinlock.h>
#include <linux/of.h>
#include <linux/of_dma.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/pm_runtime.h>
#include <linux/platform_data/edma.h>
#include "dmaengine.h"
#include "virt-dma.h"
+/* Offsets matching "struct edmacc_param" */
+#define PARM_OPT 0x00
+#define PARM_SRC 0x04
+#define PARM_A_B_CNT 0x08
+#define PARM_DST 0x0c
+#define PARM_SRC_DST_BIDX 0x10
+#define PARM_LINK_BCNTRLD 0x14
+#define PARM_SRC_DST_CIDX 0x18
+#define PARM_CCNT 0x1c
+
+#define PARM_SIZE 0x20
+
+/* Offsets for EDMA CC global channel registers and their shadows */
+#define SH_ER 0x00 /* 64 bits */
+#define SH_ECR 0x08 /* 64 bits */
+#define SH_ESR 0x10 /* 64 bits */
+#define SH_CER 0x18 /* 64 bits */
+#define SH_EER 0x20 /* 64 bits */
+#define SH_EECR 0x28 /* 64 bits */
+#define SH_EESR 0x30 /* 64 bits */
+#define SH_SER 0x38 /* 64 bits */
+#define SH_SECR 0x40 /* 64 bits */
+#define SH_IER 0x50 /* 64 bits */
+#define SH_IECR 0x58 /* 64 bits */
+#define SH_IESR 0x60 /* 64 bits */
+#define SH_IPR 0x68 /* 64 bits */
+#define SH_ICR 0x70 /* 64 bits */
+#define SH_IEVAL 0x78
+#define SH_QER 0x80
+#define SH_QEER 0x84
+#define SH_QEECR 0x88
+#define SH_QEESR 0x8c
+#define SH_QSER 0x90
+#define SH_QSECR 0x94
+#define SH_SIZE 0x200
+
+/* Offsets for EDMA CC global registers */
+#define EDMA_REV 0x0000
+#define EDMA_CCCFG 0x0004
+#define EDMA_QCHMAP 0x0200 /* 8 registers */
+#define EDMA_DMAQNUM 0x0240 /* 8 registers (4 on OMAP-L1xx) */
+#define EDMA_QDMAQNUM 0x0260
+#define EDMA_QUETCMAP 0x0280
+#define EDMA_QUEPRI 0x0284
+#define EDMA_EMR 0x0300 /* 64 bits */
+#define EDMA_EMCR 0x0308 /* 64 bits */
+#define EDMA_QEMR 0x0310
+#define EDMA_QEMCR 0x0314
+#define EDMA_CCERR 0x0318
+#define EDMA_CCERRCLR 0x031c
+#define EDMA_EEVAL 0x0320
+#define EDMA_DRAE 0x0340 /* 4 x 64 bits*/
+#define EDMA_QRAE 0x0380 /* 4 registers */
+#define EDMA_QUEEVTENTRY 0x0400 /* 2 x 16 registers */
+#define EDMA_QSTAT 0x0600 /* 2 registers */
+#define EDMA_QWMTHRA 0x0620
+#define EDMA_QWMTHRB 0x0624
+#define EDMA_CCSTAT 0x0640
+
+#define EDMA_M 0x1000 /* global channel registers */
+#define EDMA_ECR 0x1008
+#define EDMA_ECRH 0x100C
+#define EDMA_SHADOW0 0x2000 /* 4 shadow regions */
+#define EDMA_PARM 0x4000 /* PaRAM entries */
+
+#define PARM_OFFSET(param_no) (EDMA_PARM + ((param_no) << 5))
+
+#define EDMA_DCHMAP 0x0100 /* 64 registers */
+
+/* CCCFG register */
+#define GET_NUM_DMACH(x) (x & 0x7) /* bits 0-2 */
+#define GET_NUM_PAENTRY(x) ((x & 0x7000) >> 12) /* bits 12-14 */
+#define GET_NUM_EVQUE(x) ((x & 0x70000) >> 16) /* bits 16-18 */
+#define GET_NUM_REGN(x) ((x & 0x300000) >> 20) /* bits 20-21 */
+#define CHMAP_EXIST BIT(24)
+
/*
* This will go away when the private EDMA API is folded
* into this driver and the platform device(s) are
#define EDMA_MAX_SLOTS MAX_NR_SG
#define EDMA_DESCRIPTORS 16
+#define EDMA_MAX_PARAMENTRY 512
+
+#define EDMA_CHANNEL_ANY -1 /* for edma_alloc_channel() */
+#define EDMA_SLOT_ANY -1 /* for edma_alloc_slot() */
+#define EDMA_CONT_PARAMS_ANY 1001
+#define EDMA_CONT_PARAMS_FIXED_EXACT 1002
+#define EDMA_CONT_PARAMS_FIXED_NOT_EXACT 1003
+
+#define EDMA_MAX_CC 2
+
+/* PaRAM slots are laid out like this */
+struct edmacc_param {
+ u32 opt;
+ u32 src;
+ u32 a_b_cnt;
+ u32 dst;
+ u32 src_dst_bidx;
+ u32 link_bcntrld;
+ u32 src_dst_cidx;
+ u32 ccnt;
+} __packed;
+
+/* fields in edmacc_param.opt */
+#define SAM BIT(0)
+#define DAM BIT(1)
+#define SYNCDIM BIT(2)
+#define STATIC BIT(3)
+#define EDMA_FWID (0x07 << 8)
+#define TCCMODE BIT(11)
+#define EDMA_TCC(t) ((t) << 12)
+#define TCINTEN BIT(20)
+#define ITCINTEN BIT(21)
+#define TCCHEN BIT(22)
+#define ITCCHEN BIT(23)
+
+/*ch_status parameter of callback function possible values*/
+#define EDMA_DMA_COMPLETE 1
+#define EDMA_DMA_CC_ERROR 2
+#define EDMA_DMA_TC1_ERROR 3
+#define EDMA_DMA_TC2_ERROR 4
+
struct edma_pset {
u32 len;
dma_addr_t addr;
};
struct edma_cc {
- struct edma *cc;
- int ctlr;
+ struct device *dev;
+ struct edma_soc_info *info;
+ void __iomem *base;
+ int id;
+
+ /* eDMA3 resource information */
+ unsigned num_channels;
+ unsigned num_region;
+ unsigned num_slots;
+ unsigned num_tc;
+ enum dma_event_q default_queue;
+
+ bool unused_chan_list_done;
+ /* The edma_inuse bit for each PaRAM slot is clear unless the
+ * channel is in use ... by ARM or DSP, for QDMA, or whatever.
+ */
+ DECLARE_BITMAP(edma_inuse, EDMA_MAX_PARAMENTRY);
+
+ /* The edma_unused bit for each channel is clear unless
+ * it is not being used on this platform. It uses a bit
+ * of SOC-specific initialization code.
+ */
+ DECLARE_BITMAP(edma_unused, EDMA_CHANS);
+
+ struct dma_interrupt_data {
+ void (*callback)(unsigned channel, unsigned short ch_status,
+ void *data);
+ void *data;
+ } intr_data[EDMA_CHANS];
+
struct dma_device dma_slave;
struct edma_chan slave_chans[EDMA_CHANS];
- int num_slave_chans;
int dummy_slot;
};
+/* dummy param set used to (re)initialize parameter RAM slots */
+static const struct edmacc_param dummy_paramset = {
+ .link_bcntrld = 0xffff,
+ .ccnt = 1,
+};
+
+static const struct of_device_id edma_of_ids[] = {
+ { .compatible = "ti,edma3", },
+ {}
+};
+
+static inline unsigned int edma_read(struct edma_cc *ecc, int offset)
+{
+ return (unsigned int)__raw_readl(ecc->base + offset);
+}
+
+static inline void edma_write(struct edma_cc *ecc, int offset, int val)
+{
+ __raw_writel(val, ecc->base + offset);
+}
+
+static inline void edma_modify(struct edma_cc *ecc, int offset, unsigned and,
+ unsigned or)
+{
+ unsigned val = edma_read(ecc, offset);
+
+ val &= and;
+ val |= or;
+ edma_write(ecc, offset, val);
+}
+
+static inline void edma_and(struct edma_cc *ecc, int offset, unsigned and)
+{
+ unsigned val = edma_read(ecc, offset);
+
+ val &= and;
+ edma_write(ecc, offset, val);
+}
+
+static inline void edma_or(struct edma_cc *ecc, int offset, unsigned or)
+{
+ unsigned val = edma_read(ecc, offset);
+
+ val |= or;
+ edma_write(ecc, offset, val);
+}
+
+static inline unsigned int edma_read_array(struct edma_cc *ecc, int offset,
+ int i)
+{
+ return edma_read(ecc, offset + (i << 2));
+}
+
+static inline void edma_write_array(struct edma_cc *ecc, int offset, int i,
+ unsigned val)
+{
+ edma_write(ecc, offset + (i << 2), val);
+}
+
+static inline void edma_modify_array(struct edma_cc *ecc, int offset, int i,
+ unsigned and, unsigned or)
+{
+ edma_modify(ecc, offset + (i << 2), and, or);
+}
+
+static inline void edma_or_array(struct edma_cc *ecc, int offset, int i,
+ unsigned or)
+{
+ edma_or(ecc, offset + (i << 2), or);
+}
+
+static inline void edma_or_array2(struct edma_cc *ecc, int offset, int i, int j,
+ unsigned or)
+{
+ edma_or(ecc, offset + ((i * 2 + j) << 2), or);
+}
+
+static inline void edma_write_array2(struct edma_cc *ecc, int offset, int i,
+ int j, unsigned val)
+{
+ edma_write(ecc, offset + ((i * 2 + j) << 2), val);
+}
+
+static inline unsigned int edma_shadow0_read(struct edma_cc *ecc, int offset)
+{
+ return edma_read(ecc, EDMA_SHADOW0 + offset);
+}
+
+static inline unsigned int edma_shadow0_read_array(struct edma_cc *ecc,
+ int offset, int i)
+{
+ return edma_read(ecc, EDMA_SHADOW0 + offset + (i << 2));
+}
+
+static inline void edma_shadow0_write(struct edma_cc *ecc, int offset,
+ unsigned val)
+{
+ edma_write(ecc, EDMA_SHADOW0 + offset, val);
+}
+
+static inline void edma_shadow0_write_array(struct edma_cc *ecc, int offset,
+ int i, unsigned val)
+{
+ edma_write(ecc, EDMA_SHADOW0 + offset + (i << 2), val);
+}
+
+static inline unsigned int edma_parm_read(struct edma_cc *ecc, int offset,
+ int param_no)
+{
+ return edma_read(ecc, EDMA_PARM + offset + (param_no << 5));
+}
+
+static inline void edma_parm_write(struct edma_cc *ecc, int offset,
+ int param_no, unsigned val)
+{
+ edma_write(ecc, EDMA_PARM + offset + (param_no << 5), val);
+}
+
+static inline void edma_parm_modify(struct edma_cc *ecc, int offset,
+ int param_no, unsigned and, unsigned or)
+{
+ edma_modify(ecc, EDMA_PARM + offset + (param_no << 5), and, or);
+}
+
+static inline void edma_parm_and(struct edma_cc *ecc, int offset, int param_no,
+ unsigned and)
+{
+ edma_and(ecc, EDMA_PARM + offset + (param_no << 5), and);
+}
+
+static inline void edma_parm_or(struct edma_cc *ecc, int offset, int param_no,
+ unsigned or)
+{
+ edma_or(ecc, EDMA_PARM + offset + (param_no << 5), or);
+}
+
+static inline void set_bits(int offset, int len, unsigned long *p)
+{
+ for (; len > 0; len--)
+ set_bit(offset + (len - 1), p);
+}
+
+static inline void clear_bits(int offset, int len, unsigned long *p)
+{
+ for (; len > 0; len--)
+ clear_bit(offset + (len - 1), p);
+}
+
+static void edma_map_dmach_to_queue(struct edma_cc *ecc, unsigned ch_no,
+ enum dma_event_q queue_no)
+{
+ int bit = (ch_no & 0x7) * 4;
+
+ /* default to low priority queue */
+ if (queue_no == EVENTQ_DEFAULT)
+ queue_no = ecc->default_queue;
+
+ queue_no &= 7;
+ edma_modify_array(ecc, EDMA_DMAQNUM, (ch_no >> 3), ~(0x7 << bit),
+ queue_no << bit);
+}
+
+static void edma_assign_priority_to_queue(struct edma_cc *ecc, int queue_no,
+ int priority)
+{
+ int bit = queue_no * 4;
+
+ edma_modify(ecc, EDMA_QUEPRI, ~(0x7 << bit), ((priority & 0x7) << bit));
+}
+
+static void edma_direct_dmach_to_param_mapping(struct edma_cc *ecc)
+{
+ int i;
+
+ for (i = 0; i < ecc->num_channels; i++)
+ edma_write_array(ecc, EDMA_DCHMAP, i, (i << 5));
+}
+
+static int prepare_unused_channel_list(struct device *dev, void *data)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct edma_cc *ecc = data;
+ int i, count;
+ struct of_phandle_args dma_spec;
+
+ if (dev->of_node) {
+ struct platform_device *dma_pdev;
+
+ count = of_property_count_strings(dev->of_node, "dma-names");
+ if (count < 0)
+ return 0;
+ for (i = 0; i < count; i++) {
+ if (of_parse_phandle_with_args(dev->of_node, "dmas",
+ "#dma-cells", i,
+ &dma_spec))
+ continue;
+
+ if (!of_match_node(edma_of_ids, dma_spec.np)) {
+ of_node_put(dma_spec.np);
+ continue;
+ }
+
+ dma_pdev = of_find_device_by_node(dma_spec.np);
+ if (&dma_pdev->dev != ecc->dev)
+ continue;
+
+ clear_bit(EDMA_CHAN_SLOT(dma_spec.args[0]),
+ ecc->edma_unused);
+ of_node_put(dma_spec.np);
+ }
+ return 0;
+ }
+
+ /* For non-OF case */
+ for (i = 0; i < pdev->num_resources; i++) {
+ struct resource *res = &pdev->resource[i];
+
+ if ((res->flags & IORESOURCE_DMA) && (int)res->start >= 0) {
+ clear_bit(EDMA_CHAN_SLOT(pdev->resource[i].start),
+ ecc->edma_unused);
+ }
+ }
+
+ return 0;
+}
+
+static void edma_setup_interrupt(struct edma_cc *ecc, unsigned lch,
+ void (*callback)(unsigned channel, u16 ch_status, void *data),
+ void *data)
+{
+ lch = EDMA_CHAN_SLOT(lch);
+
+ if (!callback)
+ edma_shadow0_write_array(ecc, SH_IECR, lch >> 5,
+ BIT(lch & 0x1f));
+
+ ecc->intr_data[lch].callback = callback;
+ ecc->intr_data[lch].data = data;
+
+ if (callback) {
+ edma_shadow0_write_array(ecc, SH_ICR, lch >> 5,
+ BIT(lch & 0x1f));
+ edma_shadow0_write_array(ecc, SH_IESR, lch >> 5,
+ BIT(lch & 0x1f));
+ }
+}
+
+/*
+ * paRAM management functions
+ */
+
+/**
+ * edma_write_slot - write parameter RAM data for slot
+ * @ecc: pointer to edma_cc struct
+ * @slot: number of parameter RAM slot being modified
+ * @param: data to be written into parameter RAM slot
+ *
+ * Use this to assign all parameters of a transfer at once. This
+ * allows more efficient setup of transfers than issuing multiple
+ * calls to set up those parameters in small pieces, and provides
+ * complete control over all transfer options.
+ */
+static void edma_write_slot(struct edma_cc *ecc, unsigned slot,
+ const struct edmacc_param *param)
+{
+ slot = EDMA_CHAN_SLOT(slot);
+ if (slot >= ecc->num_slots)
+ return;
+ memcpy_toio(ecc->base + PARM_OFFSET(slot), param, PARM_SIZE);
+}
+
+/**
+ * edma_read_slot - read parameter RAM data from slot
+ * @ecc: pointer to edma_cc struct
+ * @slot: number of parameter RAM slot being copied
+ * @param: where to store copy of parameter RAM data
+ *
+ * Use this to read data from a parameter RAM slot, perhaps to
+ * save them as a template for later reuse.
+ */
+static void edma_read_slot(struct edma_cc *ecc, unsigned slot,
+ struct edmacc_param *param)
+{
+ slot = EDMA_CHAN_SLOT(slot);
+ if (slot >= ecc->num_slots)
+ return;
+ memcpy_fromio(param, ecc->base + PARM_OFFSET(slot), PARM_SIZE);
+}
+
+/**
+ * edma_alloc_slot - allocate DMA parameter RAM
+ * @ecc: pointer to edma_cc struct
+ * @slot: specific slot to allocate; negative for "any unused slot"
+ *
+ * This allocates a parameter RAM slot, initializing it to hold a
+ * dummy transfer. Slots allocated using this routine have not been
+ * mapped to a hardware DMA channel, and will normally be used by
+ * linking to them from a slot associated with a DMA channel.
+ *
+ * Normal use is to pass EDMA_SLOT_ANY as the @slot, but specific
+ * slots may be allocated on behalf of DSP firmware.
+ *
+ * Returns the number of the slot, else negative errno.
+ */
+static int edma_alloc_slot(struct edma_cc *ecc, int slot)
+{
+ if (slot > 0)
+ slot = EDMA_CHAN_SLOT(slot);
+ if (slot < 0) {
+ slot = ecc->num_channels;
+ for (;;) {
+ slot = find_next_zero_bit(ecc->edma_inuse,
+ ecc->num_slots,
+ slot);
+ if (slot == ecc->num_slots)
+ return -ENOMEM;
+ if (!test_and_set_bit(slot, ecc->edma_inuse))
+ break;
+ }
+ } else if (slot < ecc->num_channels || slot >= ecc->num_slots) {
+ return -EINVAL;
+ } else if (test_and_set_bit(slot, ecc->edma_inuse)) {
+ return -EBUSY;
+ }
+
+ edma_write_slot(ecc, slot, &dummy_paramset);
+
+ return EDMA_CTLR_CHAN(ecc->id, slot);
+}
+
+/**
+ * edma_free_slot - deallocate DMA parameter RAM
+ * @ecc: pointer to edma_cc struct
+ * @slot: parameter RAM slot returned from edma_alloc_slot()
+ *
+ * This deallocates the parameter RAM slot allocated by edma_alloc_slot().
+ * Callers are responsible for ensuring the slot is inactive, and will
+ * not be activated.
+ */
+static void edma_free_slot(struct edma_cc *ecc, unsigned slot)
+{
+ slot = EDMA_CHAN_SLOT(slot);
+ if (slot < ecc->num_channels || slot >= ecc->num_slots)
+ return;
+
+ edma_write_slot(ecc, slot, &dummy_paramset);
+ clear_bit(slot, ecc->edma_inuse);
+}
+
+/**
+ * edma_link - link one parameter RAM slot to another
+ * @ecc: pointer to edma_cc struct
+ * @from: parameter RAM slot originating the link
+ * @to: parameter RAM slot which is the link target
+ *
+ * The originating slot should not be part of any active DMA transfer.
+ */
+static void edma_link(struct edma_cc *ecc, unsigned from, unsigned to)
+{
+ from = EDMA_CHAN_SLOT(from);
+ to = EDMA_CHAN_SLOT(to);
+ if (from >= ecc->num_slots || to >= ecc->num_slots)
+ return;
+
+ edma_parm_modify(ecc, PARM_LINK_BCNTRLD, from, 0xffff0000,
+ PARM_OFFSET(to));
+}
+
+/**
+ * edma_get_position - returns the current transfer point
+ * @ecc: pointer to edma_cc struct
+ * @slot: parameter RAM slot being examined
+ * @dst: true selects the dest position, false the source
+ *
+ * Returns the position of the current active slot
+ */
+static dma_addr_t edma_get_position(struct edma_cc *ecc, unsigned slot,
+ bool dst)
+{
+ u32 offs;
+
+ slot = EDMA_CHAN_SLOT(slot);
+ offs = PARM_OFFSET(slot);
+ offs += dst ? PARM_DST : PARM_SRC;
+
+ return edma_read(ecc, offs);
+}
+
+/*-----------------------------------------------------------------------*/
+/**
+ * edma_start - start dma on a channel
+ * @ecc: pointer to edma_cc struct
+ * @channel: channel being activated
+ *
+ * Channels with event associations will be triggered by their hardware
+ * events, and channels without such associations will be triggered by
+ * software. (At this writing there is no interface for using software
+ * triggers except with channels that don't support hardware triggers.)
+ *
+ * Returns zero on success, else negative errno.
+ */
+static int edma_start(struct edma_cc *ecc, unsigned channel)
+{
+ if (ecc->id != EDMA_CTLR(channel)) {
+ dev_err(ecc->dev, "%s: ID mismatch for eDMA%d: %d\n", __func__,
+ ecc->id, EDMA_CTLR(channel));
+ return -EINVAL;
+ }
+ channel = EDMA_CHAN_SLOT(channel);
+
+ if (channel < ecc->num_channels) {
+ int j = channel >> 5;
+ unsigned int mask = BIT(channel & 0x1f);
+
+ /* EDMA channels without event association */
+ if (test_bit(channel, ecc->edma_unused)) {
+ pr_debug("EDMA: ESR%d %08x\n", j,
+ edma_shadow0_read_array(ecc, SH_ESR, j));
+ edma_shadow0_write_array(ecc, SH_ESR, j, mask);
+ return 0;
+ }
+
+ /* EDMA channel with event association */
+ pr_debug("EDMA: ER%d %08x\n", j,
+ edma_shadow0_read_array(ecc, SH_ER, j));
+ /* Clear any pending event or error */
+ edma_write_array(ecc, EDMA_ECR, j, mask);
+ edma_write_array(ecc, EDMA_EMCR, j, mask);
+ /* Clear any SER */
+ edma_shadow0_write_array(ecc, SH_SECR, j, mask);
+ edma_shadow0_write_array(ecc, SH_EESR, j, mask);
+ pr_debug("EDMA: EER%d %08x\n", j,
+ edma_shadow0_read_array(ecc, SH_EER, j));
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+/**
+ * edma_stop - stops dma on the channel passed
+ * @ecc: pointer to edma_cc struct
+ * @channel: channel being deactivated
+ *
+ * When @lch is a channel, any active transfer is paused and
+ * all pending hardware events are cleared. The current transfer
+ * may not be resumed, and the channel's Parameter RAM should be
+ * reinitialized before being reused.
+ */
+static void edma_stop(struct edma_cc *ecc, unsigned channel)
+{
+ if (ecc->id != EDMA_CTLR(channel)) {
+ dev_err(ecc->dev, "%s: ID mismatch for eDMA%d: %d\n", __func__,
+ ecc->id, EDMA_CTLR(channel));
+ return;
+ }
+ channel = EDMA_CHAN_SLOT(channel);
+
+ if (channel < ecc->num_channels) {
+ int j = channel >> 5;
+ unsigned int mask = BIT(channel & 0x1f);
+
+ edma_shadow0_write_array(ecc, SH_EECR, j, mask);
+ edma_shadow0_write_array(ecc, SH_ECR, j, mask);
+ edma_shadow0_write_array(ecc, SH_SECR, j, mask);
+ edma_write_array(ecc, EDMA_EMCR, j, mask);
+
+ /* clear possibly pending completion interrupt */
+ edma_shadow0_write_array(ecc, SH_ICR, j, mask);
+
+ pr_debug("EDMA: EER%d %08x\n", j,
+ edma_shadow0_read_array(ecc, SH_EER, j));
+
+ /* REVISIT: consider guarding against inappropriate event
+ * chaining by overwriting with dummy_paramset.
+ */
+ }
+}
+
+/**
+ * edma_pause - pause dma on a channel
+ * @ecc: pointer to edma_cc struct
+ * @channel: on which edma_start() has been called
+ *
+ * This temporarily disables EDMA hardware events on the specified channel,
+ * preventing them from triggering new transfers on its behalf
+ */
+static void edma_pause(struct edma_cc *ecc, unsigned channel)
+{
+ if (ecc->id != EDMA_CTLR(channel)) {
+ dev_err(ecc->dev, "%s: ID mismatch for eDMA%d: %d\n", __func__,
+ ecc->id, EDMA_CTLR(channel));
+ return;
+ }
+ channel = EDMA_CHAN_SLOT(channel);
+
+ if (channel < ecc->num_channels) {
+ unsigned int mask = BIT(channel & 0x1f);
+
+ edma_shadow0_write_array(ecc, SH_EECR, channel >> 5, mask);
+ }
+}
+
+/**
+ * edma_resume - resumes dma on a paused channel
+ * @ecc: pointer to edma_cc struct
+ * @channel: on which edma_pause() has been called
+ *
+ * This re-enables EDMA hardware events on the specified channel.
+ */
+static void edma_resume(struct edma_cc *ecc, unsigned channel)
+{
+ if (ecc->id != EDMA_CTLR(channel)) {
+ dev_err(ecc->dev, "%s: ID mismatch for eDMA%d: %d\n", __func__,
+ ecc->id, EDMA_CTLR(channel));
+ return;
+ }
+ channel = EDMA_CHAN_SLOT(channel);
+
+ if (channel < ecc->num_channels) {
+ unsigned int mask = BIT(channel & 0x1f);
+
+ edma_shadow0_write_array(ecc, SH_EESR, channel >> 5, mask);
+ }
+}
+
+static int edma_trigger_channel(struct edma_cc *ecc, unsigned channel)
+{
+ unsigned int mask;
+
+ if (ecc->id != EDMA_CTLR(channel)) {
+ dev_err(ecc->dev, "%s: ID mismatch for eDMA%d: %d\n", __func__,
+ ecc->id, EDMA_CTLR(channel));
+ return -EINVAL;
+ }
+ channel = EDMA_CHAN_SLOT(channel);
+ mask = BIT(channel & 0x1f);
+
+ edma_shadow0_write_array(ecc, SH_ESR, (channel >> 5), mask);
+
+ pr_debug("EDMA: ESR%d %08x\n", (channel >> 5),
+ edma_shadow0_read_array(ecc, SH_ESR, (channel >> 5)));
+ return 0;
+}
+
+/******************************************************************************
+ *
+ * It cleans ParamEntry qand bring back EDMA to initial state if media has
+ * been removed before EDMA has finished.It is usedful for removable media.
+ * Arguments:
+ * ch_no - channel no
+ *
+ * Return: zero on success, or corresponding error no on failure
+ *
+ * FIXME this should not be needed ... edma_stop() should suffice.
+ *
+ *****************************************************************************/
+
+static void edma_clean_channel(struct edma_cc *ecc, unsigned channel)
+{
+ if (ecc->id != EDMA_CTLR(channel)) {
+ dev_err(ecc->dev, "%s: ID mismatch for eDMA%d: %d\n", __func__,
+ ecc->id, EDMA_CTLR(channel));
+ return;
+ }
+ channel = EDMA_CHAN_SLOT(channel);
+
+ if (channel < ecc->num_channels) {
+ int j = (channel >> 5);
+ unsigned int mask = BIT(channel & 0x1f);
+
+ pr_debug("EDMA: EMR%d %08x\n", j,
+ edma_read_array(ecc, EDMA_EMR, j));
+ edma_shadow0_write_array(ecc, SH_ECR, j, mask);
+ /* Clear the corresponding EMR bits */
+ edma_write_array(ecc, EDMA_EMCR, j, mask);
+ /* Clear any SER */
+ edma_shadow0_write_array(ecc, SH_SECR, j, mask);
+ edma_write(ecc, EDMA_CCERRCLR, BIT(16) | BIT(1) | BIT(0));
+ }
+}
+
+/**
+ * edma_alloc_channel - allocate DMA channel and paired parameter RAM
+ * @ecc: pointer to edma_cc struct
+ * @channel: specific channel to allocate; negative for "any unmapped channel"
+ * @callback: optional; to be issued on DMA completion or errors
+ * @data: passed to callback
+ * @eventq_no: an EVENTQ_* constant, used to choose which Transfer
+ * Controller (TC) executes requests using this channel. Use
+ * EVENTQ_DEFAULT unless you really need a high priority queue.
+ *
+ * This allocates a DMA channel and its associated parameter RAM slot.
+ * The parameter RAM is initialized to hold a dummy transfer.
+ *
+ * Normal use is to pass a specific channel number as @channel, to make
+ * use of hardware events mapped to that channel. When the channel will
+ * be used only for software triggering or event chaining, channels not
+ * mapped to hardware events (or mapped to unused events) are preferable.
+ *
+ * DMA transfers start from a channel using edma_start(), or by
+ * chaining. When the transfer described in that channel's parameter RAM
+ * slot completes, that slot's data may be reloaded through a link.
+ *
+ * DMA errors are only reported to the @callback associated with the
+ * channel driving that transfer, but transfer completion callbacks can
+ * be sent to another channel under control of the TCC field in
+ * the option word of the transfer's parameter RAM set. Drivers must not
+ * use DMA transfer completion callbacks for channels they did not allocate.
+ * (The same applies to TCC codes used in transfer chaining.)
+ *
+ * Returns the number of the channel, else negative errno.
+ */
+static int edma_alloc_channel(struct edma_cc *ecc, int channel,
+ void (*callback)(unsigned channel, u16 ch_status, void *data),
+ void *data,
+ enum dma_event_q eventq_no)
+{
+ unsigned done = 0;
+ int ret = 0;
+
+ if (!ecc->unused_chan_list_done) {
+ /*
+ * Scan all the platform devices to find out the EDMA channels
+ * used and clear them in the unused list, making the rest
+ * available for ARM usage.
+ */
+ ret = bus_for_each_dev(&platform_bus_type, NULL, ecc,
+ prepare_unused_channel_list);
+ if (ret < 0)
+ return ret;
+
+ ecc->unused_chan_list_done = true;
+ }
+
+ if (channel >= 0) {
+ if (ecc->id != EDMA_CTLR(channel)) {
+ dev_err(ecc->dev, "%s: ID mismatch for eDMA%d: %d\n",
+ __func__, ecc->id, EDMA_CTLR(channel));
+ return -EINVAL;
+ }
+ channel = EDMA_CHAN_SLOT(channel);
+ }
+
+ if (channel < 0) {
+ channel = 0;
+ for (;;) {
+ channel = find_next_bit(ecc->edma_unused,
+ ecc->num_channels, channel);
+ if (channel == ecc->num_channels)
+ break;
+ if (!test_and_set_bit(channel, ecc->edma_inuse)) {
+ done = 1;
+ break;
+ }
+ channel++;
+ }
+ if (!done)
+ return -ENOMEM;
+ } else if (channel >= ecc->num_channels) {
+ return -EINVAL;
+ } else if (test_and_set_bit(channel, ecc->edma_inuse)) {
+ return -EBUSY;
+ }
+
+ /* ensure access through shadow region 0 */
+ edma_or_array2(ecc, EDMA_DRAE, 0, channel >> 5, BIT(channel & 0x1f));
+
+ /* ensure no events are pending */
+ edma_stop(ecc, EDMA_CTLR_CHAN(ecc->id, channel));
+ edma_write_slot(ecc, channel, &dummy_paramset);
+
+ if (callback)
+ edma_setup_interrupt(ecc, EDMA_CTLR_CHAN(ecc->id, channel),
+ callback, data);
+
+ edma_map_dmach_to_queue(ecc, channel, eventq_no);
+
+ return EDMA_CTLR_CHAN(ecc->id, channel);
+}
+
+/**
+ * edma_free_channel - deallocate DMA channel
+ * @ecc: pointer to edma_cc struct
+ * @channel: dma channel returned from edma_alloc_channel()
+ *
+ * This deallocates the DMA channel and associated parameter RAM slot
+ * allocated by edma_alloc_channel().
+ *
+ * Callers are responsible for ensuring the channel is inactive, and
+ * will not be reactivated by linking, chaining, or software calls to
+ * edma_start().
+ */
+static void edma_free_channel(struct edma_cc *ecc, unsigned channel)
+{
+ if (ecc->id != EDMA_CTLR(channel)) {
+ dev_err(ecc->dev, "%s: ID mismatch for eDMA%d: %d\n", __func__,
+ ecc->id, EDMA_CTLR(channel));
+ return;
+ }
+ channel = EDMA_CHAN_SLOT(channel);
+
+ if (channel >= ecc->num_channels)
+ return;
+
+ edma_setup_interrupt(ecc, channel, NULL, NULL);
+ /* REVISIT should probably take out of shadow region 0 */
+
+ memcpy_toio(ecc->base + PARM_OFFSET(channel), &dummy_paramset,
+ PARM_SIZE);
+ clear_bit(channel, ecc->edma_inuse);
+}
+
+/*
+ * edma_assign_channel_eventq - move given channel to desired eventq
+ * Arguments:
+ * channel - channel number
+ * eventq_no - queue to move the channel
+ *
+ * Can be used to move a channel to a selected event queue.
+ */
+static void edma_assign_channel_eventq(struct edma_cc *ecc, unsigned channel,
+ enum dma_event_q eventq_no)
+{
+ if (ecc->id != EDMA_CTLR(channel)) {
+ dev_err(ecc->dev, "%s: ID mismatch for eDMA%d: %d\n", __func__,
+ ecc->id, EDMA_CTLR(channel));
+ return;
+ }
+ channel = EDMA_CHAN_SLOT(channel);
+
+ if (channel >= ecc->num_channels)
+ return;
+
+ /* default to low priority queue */
+ if (eventq_no == EVENTQ_DEFAULT)
+ eventq_no = ecc->default_queue;
+ if (eventq_no >= ecc->num_tc)
+ return;
+
+ edma_map_dmach_to_queue(ecc, channel, eventq_no);
+}
+
+static irqreturn_t dma_irq_handler(int irq, void *data)
+{
+ struct edma_cc *ecc = data;
+ int ctlr;
+ u32 sh_ier;
+ u32 sh_ipr;
+ u32 bank;
+
+ ctlr = ecc->id;
+ if (ctlr < 0)
+ return IRQ_NONE;
+
+ dev_dbg(ecc->dev, "dma_irq_handler\n");
+
+ sh_ipr = edma_shadow0_read_array(ecc, SH_IPR, 0);
+ if (!sh_ipr) {
+ sh_ipr = edma_shadow0_read_array(ecc, SH_IPR, 1);
+ if (!sh_ipr)
+ return IRQ_NONE;
+ sh_ier = edma_shadow0_read_array(ecc, SH_IER, 1);
+ bank = 1;
+ } else {
+ sh_ier = edma_shadow0_read_array(ecc, SH_IER, 0);
+ bank = 0;
+ }
+
+ do {
+ u32 slot;
+ u32 channel;
+
+ dev_dbg(ecc->dev, "IPR%d %08x\n", bank, sh_ipr);
+
+ slot = __ffs(sh_ipr);
+ sh_ipr &= ~(BIT(slot));
+
+ if (sh_ier & BIT(slot)) {
+ channel = (bank << 5) | slot;
+ /* Clear the corresponding IPR bits */
+ edma_shadow0_write_array(ecc, SH_ICR, bank, BIT(slot));
+ if (ecc->intr_data[channel].callback)
+ ecc->intr_data[channel].callback(
+ EDMA_CTLR_CHAN(ctlr, channel),
+ EDMA_DMA_COMPLETE,
+ ecc->intr_data[channel].data);
+ }
+ } while (sh_ipr);
+
+ edma_shadow0_write(ecc, SH_IEVAL, 1);
+ return IRQ_HANDLED;
+}
+
+/******************************************************************************
+ *
+ * DMA error interrupt handler
+ *
+ *****************************************************************************/
+static irqreturn_t dma_ccerr_handler(int irq, void *data)
+{
+ struct edma_cc *ecc = data;
+ int i;
+ int ctlr;
+ unsigned int cnt = 0;
+
+ ctlr = ecc->id;
+ if (ctlr < 0)
+ return IRQ_NONE;
+
+ dev_dbg(ecc->dev, "dma_ccerr_handler\n");
+
+ if ((edma_read_array(ecc, EDMA_EMR, 0) == 0) &&
+ (edma_read_array(ecc, EDMA_EMR, 1) == 0) &&
+ (edma_read(ecc, EDMA_QEMR) == 0) &&
+ (edma_read(ecc, EDMA_CCERR) == 0))
+ return IRQ_NONE;
+
+ while (1) {
+ int j = -1;
+
+ if (edma_read_array(ecc, EDMA_EMR, 0))
+ j = 0;
+ else if (edma_read_array(ecc, EDMA_EMR, 1))
+ j = 1;
+ if (j >= 0) {
+ dev_dbg(ecc->dev, "EMR%d %08x\n", j,
+ edma_read_array(ecc, EDMA_EMR, j));
+ for (i = 0; i < 32; i++) {
+ int k = (j << 5) + i;
+
+ if (edma_read_array(ecc, EDMA_EMR, j) &
+ BIT(i)) {
+ /* Clear the corresponding EMR bits */
+ edma_write_array(ecc, EDMA_EMCR, j,
+ BIT(i));
+ /* Clear any SER */
+ edma_shadow0_write_array(ecc, SH_SECR,
+ j, BIT(i));
+ if (ecc->intr_data[k].callback) {
+ ecc->intr_data[k].callback(
+ EDMA_CTLR_CHAN(ctlr, k),
+ EDMA_DMA_CC_ERROR,
+ ecc->intr_data[k].data);
+ }
+ }
+ }
+ } else if (edma_read(ecc, EDMA_QEMR)) {
+ dev_dbg(ecc->dev, "QEMR %02x\n",
+ edma_read(ecc, EDMA_QEMR));
+ for (i = 0; i < 8; i++) {
+ if (edma_read(ecc, EDMA_QEMR) & BIT(i)) {
+ /* Clear the corresponding IPR bits */
+ edma_write(ecc, EDMA_QEMCR, BIT(i));
+ edma_shadow0_write(ecc, SH_QSECR,
+ BIT(i));
+
+ /* NOTE: not reported!! */
+ }
+ }
+ } else if (edma_read(ecc, EDMA_CCERR)) {
+ dev_dbg(ecc->dev, "CCERR %08x\n",
+ edma_read(ecc, EDMA_CCERR));
+ /* FIXME: CCERR.BIT(16) ignored! much better
+ * to just write CCERRCLR with CCERR value...
+ */
+ for (i = 0; i < 8; i++) {
+ if (edma_read(ecc, EDMA_CCERR) & BIT(i)) {
+ /* Clear the corresponding IPR bits */
+ edma_write(ecc, EDMA_CCERRCLR, BIT(i));
+
+ /* NOTE: not reported!! */
+ }
+ }
+ }
+ if ((edma_read_array(ecc, EDMA_EMR, 0) == 0) &&
+ (edma_read_array(ecc, EDMA_EMR, 1) == 0) &&
+ (edma_read(ecc, EDMA_QEMR) == 0) &&
+ (edma_read(ecc, EDMA_CCERR) == 0))
+ break;
+ cnt++;
+ if (cnt > 10)
+ break;
+ }
+ edma_write(ecc, EDMA_EEVAL, 1);
+ return IRQ_HANDLED;
+}
+
static inline struct edma_cc *to_edma_cc(struct dma_device *d)
{
return container_of(d, struct edma_cc, dma_slave);
return container_of(c, struct edma_chan, vchan.chan);
}
-static inline struct edma_desc
-*to_edma_desc(struct dma_async_tx_descriptor *tx)
+static inline struct edma_desc *to_edma_desc(struct dma_async_tx_descriptor *tx)
{
return container_of(tx, struct edma_desc, vdesc.tx);
}
/* Dispatch a queued descriptor to the controller (caller holds lock) */
static void edma_execute(struct edma_chan *echan)
{
- struct edma *cc = echan->ecc->cc;
+ struct edma_cc *ecc = echan->ecc;
struct virt_dma_desc *vdesc;
struct edma_desc *edesc;
struct device *dev = echan->vchan.chan.device->dev;
/* Write descriptor PaRAM set(s) */
for (i = 0; i < nslots; i++) {
j = i + edesc->processed;
- edma_write_slot(cc, echan->slot[i], &edesc->pset[j].param);
+ edma_write_slot(ecc, echan->slot[i], &edesc->pset[j].param);
edesc->sg_len += edesc->pset[j].len;
dev_vdbg(echan->vchan.chan.device->dev,
"\n pset[%d]:\n"
edesc->pset[j].param.link_bcntrld);
/* Link to the previous slot if not the last set */
if (i != (nslots - 1))
- edma_link(cc, echan->slot[i], echan->slot[i+1]);
+ edma_link(ecc, echan->slot[i], echan->slot[i + 1]);
}
edesc->processed += nslots;
*/
if (edesc->processed == edesc->pset_nr) {
if (edesc->cyclic)
- edma_link(cc, echan->slot[nslots-1], echan->slot[1]);
+ edma_link(ecc, echan->slot[nslots - 1], echan->slot[1]);
else
- edma_link(cc, echan->slot[nslots-1],
+ edma_link(ecc, echan->slot[nslots - 1],
echan->ecc->dummy_slot);
}
* transfers of MAX_NR_SG
*/
dev_dbg(dev, "missed event on channel %d\n", echan->ch_num);
- edma_clean_channel(cc, echan->ch_num);
- edma_stop(cc, echan->ch_num);
- edma_start(cc, echan->ch_num);
- edma_trigger_channel(cc, echan->ch_num);
+ edma_clean_channel(ecc, echan->ch_num);
+ edma_stop(ecc, echan->ch_num);
+ edma_start(ecc, echan->ch_num);
+ edma_trigger_channel(ecc, echan->ch_num);
echan->missed = 0;
} else if (edesc->processed <= MAX_NR_SG) {
dev_dbg(dev, "first transfer starting on channel %d\n",
echan->ch_num);
- edma_start(cc, echan->ch_num);
+ edma_start(ecc, echan->ch_num);
} else {
dev_dbg(dev, "chan: %d: completed %d elements, resuming\n",
echan->ch_num, edesc->processed);
- edma_resume(cc, echan->ch_num);
+ edma_resume(ecc, echan->ch_num);
}
}
* echan->edesc is NULL and exit.)
*/
if (echan->edesc) {
- edma_stop(echan->ecc->cc, echan->ch_num);
+ edma_stop(echan->ecc, echan->ch_num);
/* Move the cyclic channel back to default queue */
if (echan->edesc->cyclic)
- edma_assign_channel_eventq(echan->ecc->cc,
- echan->ch_num,
+ edma_assign_channel_eventq(echan->ecc, echan->ch_num,
EVENTQ_DEFAULT);
/*
* free the running request descriptor
if (!echan->edesc)
return -EINVAL;
- edma_pause(echan->ecc->cc, echan->ch_num);
+ edma_pause(echan->ecc, echan->ch_num);
return 0;
}
{
struct edma_chan *echan = to_edma_chan(chan);
- edma_resume(echan->ecc->cc, echan->ch_num);
+ edma_resume(echan->ecc, echan->ch_num);
return 0;
}
* @direction: Direction of the transfer
*/
static int edma_config_pset(struct dma_chan *chan, struct edma_pset *epset,
- dma_addr_t src_addr, dma_addr_t dst_addr, u32 burst,
- enum dma_slave_buswidth dev_width, unsigned int dma_length,
- enum dma_transfer_direction direction)
+ dma_addr_t src_addr, dma_addr_t dst_addr, u32 burst,
+ enum dma_slave_buswidth dev_width,
+ unsigned int dma_length,
+ enum dma_transfer_direction direction)
{
struct edma_chan *echan = to_edma_chan(chan);
struct device *dev = chan->device->dev;
return NULL;
}
- edesc = kzalloc(sizeof(*edesc) + sg_len *
- sizeof(edesc->pset[0]), GFP_ATOMIC);
+ edesc = kzalloc(sizeof(*edesc) + sg_len * sizeof(edesc->pset[0]),
+ GFP_ATOMIC);
if (!edesc) {
dev_err(dev, "%s: Failed to allocate a descriptor\n", __func__);
return NULL;
for (i = 0; i < nslots; i++) {
if (echan->slot[i] < 0) {
echan->slot[i] =
- edma_alloc_slot(echan->ecc->cc, EDMA_SLOT_ANY);
+ edma_alloc_slot(echan->ecc, EDMA_SLOT_ANY);
if (echan->slot[i] < 0) {
kfree(edesc);
dev_err(dev, "%s: Failed to allocate slot\n",
if (nslots > MAX_NR_SG)
return NULL;
- edesc = kzalloc(sizeof(*edesc) + nslots *
- sizeof(edesc->pset[0]), GFP_ATOMIC);
+ edesc = kzalloc(sizeof(*edesc) + nslots * sizeof(edesc->pset[0]),
+ GFP_ATOMIC);
if (!edesc) {
dev_err(dev, "%s: Failed to allocate a descriptor\n", __func__);
return NULL;
/* Allocate a PaRAM slot, if needed */
if (echan->slot[i] < 0) {
echan->slot[i] =
- edma_alloc_slot(echan->ecc->cc, EDMA_SLOT_ANY);
+ edma_alloc_slot(echan->ecc, EDMA_SLOT_ANY);
if (echan->slot[i] < 0) {
kfree(edesc);
dev_err(dev, "%s: Failed to allocate slot\n",
}
/* Place the cyclic channel to highest priority queue */
- edma_assign_channel_eventq(echan->ecc->cc, echan->ch_num, EVENTQ_0);
+ edma_assign_channel_eventq(echan->ecc, echan->ch_num, EVENTQ_0);
return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags);
}
static void edma_callback(unsigned ch_num, u16 ch_status, void *data)
{
struct edma_chan *echan = data;
- struct edma *cc = echan->ecc->cc;
+ struct edma_cc *ecc = echan->ecc;
struct device *dev = echan->vchan.chan.device->dev;
struct edma_desc *edesc;
struct edmacc_param p;
vchan_cyclic_callback(&edesc->vdesc);
goto out;
} else if (edesc->processed == edesc->pset_nr) {
- dev_dbg(dev, "Transfer complete, stopping channel %d\n", ch_num);
+ dev_dbg(dev,
+ "Transfer completed on channel %d\n",
+ ch_num);
edesc->residue = 0;
- edma_stop(cc, echan->ch_num);
+ edma_stop(ecc, echan->ch_num);
vchan_cookie_complete(&edesc->vdesc);
echan->edesc = NULL;
} else {
- dev_dbg(dev, "Intermediate transfer complete on channel %d\n", ch_num);
+ dev_dbg(dev,
+ "Sub transfer completed on channel %d\n",
+ ch_num);
- edma_pause(cc, echan->ch_num);
+ edma_pause(ecc, echan->ch_num);
/* Update statistics for tx_status */
edesc->residue -= edesc->sg_len;
}
break;
case EDMA_DMA_CC_ERROR:
- edma_read_slot(cc, echan->slot[0], &p);
+ edma_read_slot(ecc, echan->slot[0], &p);
/*
* Issue later based on missed flag which will be sure
* slot. So we avoid doing so and set the missed flag.
*/
if (p.a_b_cnt == 0 && p.ccnt == 0) {
- dev_dbg(dev, "Error occurred, looks like slot is null, just setting miss\n");
+ dev_dbg(dev, "Error on null slot, setting miss\n");
echan->missed = 1;
} else {
/*
* The slot is already programmed but the event got
* missed, so its safe to issue it here.
*/
- dev_dbg(dev, "Error occurred but slot is non-null, TRIGGERING\n");
- edma_clean_channel(cc, echan->ch_num);
- edma_stop(cc, echan->ch_num);
- edma_start(cc, echan->ch_num);
- edma_trigger_channel(cc, echan->ch_num);
+ dev_dbg(dev, "Missed event, TRIGGERING\n");
+ edma_clean_channel(ecc, echan->ch_num);
+ edma_stop(ecc, echan->ch_num);
+ edma_start(ecc, echan->ch_num);
+ edma_trigger_channel(ecc, echan->ch_num);
}
break;
default:
int a_ch_num;
LIST_HEAD(descs);
- a_ch_num = edma_alloc_channel(echan->ecc->cc, echan->ch_num,
+ a_ch_num = edma_alloc_channel(echan->ecc, echan->ch_num,
edma_callback, echan, EVENTQ_DEFAULT);
if (a_ch_num < 0) {
return 0;
err_wrong_chan:
- edma_free_channel(echan->ecc->cc, a_ch_num);
+ edma_free_channel(echan->ecc, a_ch_num);
err_no_chan:
return ret;
}
int i;
/* Terminate transfers */
- edma_stop(echan->ecc->cc, echan->ch_num);
+ edma_stop(echan->ecc, echan->ch_num);
vchan_free_chan_resources(&echan->vchan);
/* Free EDMA PaRAM slots */
for (i = 1; i < EDMA_MAX_SLOTS; i++) {
if (echan->slot[i] >= 0) {
- edma_free_slot(echan->ecc->cc, echan->slot[i]);
+ edma_free_slot(echan->ecc, echan->slot[i]);
echan->slot[i] = -1;
}
}
/* Free EDMA channel */
if (echan->alloced) {
- edma_free_channel(echan->ecc->cc, echan->ch_num);
+ edma_free_channel(echan->ecc, echan->ch_num);
echan->alloced = false;
}
* We always read the dst/src position from the first RamPar
* pset. That's the one which is active now.
*/
- pos = edma_get_position(edesc->echan->ecc->cc, edesc->echan->slot[0],
- dst);
+ pos = edma_get_position(edesc->echan->ecc, edesc->echan->slot[0], dst);
/*
* Cyclic is simple. Just subtract pset[0].addr from pos.
return ret;
}
-static void __init edma_chan_init(struct edma_cc *ecc,
- struct dma_device *dma,
+static void __init edma_chan_init(struct edma_cc *ecc, struct dma_device *dma,
struct edma_chan *echans)
{
int i, j;
for (i = 0; i < EDMA_CHANS; i++) {
struct edma_chan *echan = &echans[i];
- echan->ch_num = EDMA_CTLR_CHAN(ecc->ctlr, i);
+ echan->ch_num = EDMA_CTLR_CHAN(ecc->id, i);
echan->ecc = ecc;
echan->vchan.desc_free = edma_desc_free;
INIT_LIST_HEAD(&dma->channels);
}
+static int edma_setup_from_hw(struct device *dev, struct edma_soc_info *pdata,
+ struct edma_cc *ecc)
+{
+ int i;
+ u32 value, cccfg;
+ s8 (*queue_priority_map)[2];
+
+ /* Decode the eDMA3 configuration from CCCFG register */
+ cccfg = edma_read(ecc, EDMA_CCCFG);
+
+ value = GET_NUM_REGN(cccfg);
+ ecc->num_region = BIT(value);
+
+ value = GET_NUM_DMACH(cccfg);
+ ecc->num_channels = BIT(value + 1);
+
+ value = GET_NUM_PAENTRY(cccfg);
+ ecc->num_slots = BIT(value + 4);
+
+ value = GET_NUM_EVQUE(cccfg);
+ ecc->num_tc = value + 1;
+
+ dev_dbg(dev, "eDMA3 CC HW configuration (cccfg: 0x%08x):\n", cccfg);
+ dev_dbg(dev, "num_region: %u\n", ecc->num_region);
+ dev_dbg(dev, "num_channels: %u\n", ecc->num_channels);
+ dev_dbg(dev, "num_slots: %u\n", ecc->num_slots);
+ dev_dbg(dev, "num_tc: %u\n", ecc->num_tc);
+
+ /* Nothing need to be done if queue priority is provided */
+ if (pdata->queue_priority_mapping)
+ return 0;
+
+ /*
+ * Configure TC/queue priority as follows:
+ * Q0 - priority 0
+ * Q1 - priority 1
+ * Q2 - priority 2
+ * ...
+ * The meaning of priority numbers: 0 highest priority, 7 lowest
+ * priority. So Q0 is the highest priority queue and the last queue has
+ * the lowest priority.
+ */
+ queue_priority_map = devm_kzalloc(dev, (ecc->num_tc + 1) * sizeof(s8),
+ GFP_KERNEL);
+ if (!queue_priority_map)
+ return -ENOMEM;
+
+ for (i = 0; i < ecc->num_tc; i++) {
+ queue_priority_map[i][0] = i;
+ queue_priority_map[i][1] = i;
+ }
+ queue_priority_map[i][0] = -1;
+ queue_priority_map[i][1] = -1;
+
+ pdata->queue_priority_mapping = queue_priority_map;
+ /* Default queue has the lowest priority */
+ pdata->default_queue = i - 1;
+
+ return 0;
+}
+
+#if IS_ENABLED(CONFIG_OF)
+static int edma_xbar_event_map(struct device *dev, struct edma_soc_info *pdata,
+ size_t sz)
+{
+ const char pname[] = "ti,edma-xbar-event-map";
+ struct resource res;
+ void __iomem *xbar;
+ s16 (*xbar_chans)[2];
+ size_t nelm = sz / sizeof(s16);
+ u32 shift, offset, mux;
+ int ret, i;
+
+ xbar_chans = devm_kzalloc(dev, (nelm + 2) * sizeof(s16), GFP_KERNEL);
+ if (!xbar_chans)
+ return -ENOMEM;
+
+ ret = of_address_to_resource(dev->of_node, 1, &res);
+ if (ret)
+ return -ENOMEM;
+
+ xbar = devm_ioremap(dev, res.start, resource_size(&res));
+ if (!xbar)
+ return -ENOMEM;
+
+ ret = of_property_read_u16_array(dev->of_node, pname, (u16 *)xbar_chans,
+ nelm);
+ if (ret)
+ return -EIO;
+
+ /* Invalidate last entry for the other user of this mess */
+ nelm >>= 1;
+ xbar_chans[nelm][0] = -1;
+ xbar_chans[nelm][1] = -1;
+
+ for (i = 0; i < nelm; i++) {
+ shift = (xbar_chans[i][1] & 0x03) << 3;
+ offset = xbar_chans[i][1] & 0xfffffffc;
+ mux = readl(xbar + offset);
+ mux &= ~(0xff << shift);
+ mux |= xbar_chans[i][0] << shift;
+ writel(mux, (xbar + offset));
+ }
+
+ pdata->xbar_chans = (const s16 (*)[2]) xbar_chans;
+ return 0;
+}
+
+static int edma_of_parse_dt(struct device *dev, struct edma_soc_info *pdata)
+{
+ int ret = 0;
+ struct property *prop;
+ size_t sz;
+ struct edma_rsv_info *rsv_info;
+
+ rsv_info = devm_kzalloc(dev, sizeof(struct edma_rsv_info), GFP_KERNEL);
+ if (!rsv_info)
+ return -ENOMEM;
+ pdata->rsv = rsv_info;
+
+ prop = of_find_property(dev->of_node, "ti,edma-xbar-event-map", &sz);
+ if (prop)
+ ret = edma_xbar_event_map(dev, pdata, sz);
+
+ return ret;
+}
+
+static struct edma_soc_info *edma_setup_info_from_dt(struct device *dev)
+{
+ struct edma_soc_info *info;
+ int ret;
+
+ info = devm_kzalloc(dev, sizeof(struct edma_soc_info), GFP_KERNEL);
+ if (!info)
+ return ERR_PTR(-ENOMEM);
+
+ ret = edma_of_parse_dt(dev, info);
+ if (ret)
+ return ERR_PTR(ret);
+
+ return info;
+}
+#else
+static struct edma_soc_info *edma_setup_info_from_dt(struct device *dev)
+{
+ return ERR_PTR(-EINVAL);
+}
+#endif
+
static int edma_probe(struct platform_device *pdev)
{
- struct edma_cc *ecc;
- struct device_node *parent_node = pdev->dev.parent->of_node;
- struct platform_device *parent_pdev =
- to_platform_device(pdev->dev.parent);
+ struct edma_soc_info *info = pdev->dev.platform_data;
+ s8 (*queue_priority_mapping)[2];
+ int i, off, ln;
+ const s16 (*rsv_chans)[2];
+ const s16 (*rsv_slots)[2];
+ const s16 (*xbar_chans)[2];
+ int irq;
+ char *irq_name;
+ struct resource *mem;
+ struct device_node *node = pdev->dev.of_node;
+ struct device *dev = &pdev->dev;
+ struct edma_cc *ecc;
int ret;
+ if (node) {
+ info = edma_setup_info_from_dt(dev);
+ if (IS_ERR(info)) {
+ dev_err(dev, "failed to get DT data\n");
+ return PTR_ERR(info);
+ }
+ }
+
+ if (!info)
+ return -ENODEV;
+
+ pm_runtime_enable(dev);
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0) {
+ dev_err(dev, "pm_runtime_get_sync() failed\n");
+ return ret;
+ }
+
ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
if (ret)
return ret;
return -ENOMEM;
}
- ecc->cc = edma_get_data(pdev->dev.parent);
- if (!ecc->cc)
- return -ENODEV;
+ ecc->dev = dev;
+ ecc->id = pdev->id;
+ /* When booting with DT the pdev->id is -1 */
+ if (ecc->id < 0)
+ ecc->id = 0;
+
+ mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "edma3_cc");
+ if (!mem) {
+ dev_dbg(dev, "mem resource not found, using index 0\n");
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!mem) {
+ dev_err(dev, "no mem resource?\n");
+ return -ENODEV;
+ }
+ }
+ ecc->base = devm_ioremap_resource(dev, mem);
+ if (IS_ERR(ecc->base))
+ return PTR_ERR(ecc->base);
+
+ platform_set_drvdata(pdev, ecc);
+
+ /* Get eDMA3 configuration from IP */
+ ret = edma_setup_from_hw(dev, info, ecc);
+ if (ret)
+ return ret;
+
+ ecc->default_queue = info->default_queue;
+
+ for (i = 0; i < ecc->num_slots; i++)
+ edma_write_slot(ecc, i, &dummy_paramset);
+
+ /* Mark all channels as unused */
+ memset(ecc->edma_unused, 0xff, sizeof(ecc->edma_unused));
+
+ if (info->rsv) {
+ /* Clear the reserved channels in unused list */
+ rsv_chans = info->rsv->rsv_chans;
+ if (rsv_chans) {
+ for (i = 0; rsv_chans[i][0] != -1; i++) {
+ off = rsv_chans[i][0];
+ ln = rsv_chans[i][1];
+ clear_bits(off, ln, ecc->edma_unused);
+ }
+ }
+
+ /* Set the reserved slots in inuse list */
+ rsv_slots = info->rsv->rsv_slots;
+ if (rsv_slots) {
+ for (i = 0; rsv_slots[i][0] != -1; i++) {
+ off = rsv_slots[i][0];
+ ln = rsv_slots[i][1];
+ set_bits(off, ln, ecc->edma_inuse);
+ }
+ }
+ }
+
+ /* Clear the xbar mapped channels in unused list */
+ xbar_chans = info->xbar_chans;
+ if (xbar_chans) {
+ for (i = 0; xbar_chans[i][1] != -1; i++) {
+ off = xbar_chans[i][1];
+ clear_bits(off, 1, ecc->edma_unused);
+ }
+ }
+
+ irq = platform_get_irq_byname(pdev, "edma3_ccint");
+ if (irq < 0 && node)
+ irq = irq_of_parse_and_map(node, 0);
+
+ if (irq >= 0) {
+ irq_name = devm_kasprintf(dev, GFP_KERNEL, "%s_ccint",
+ dev_name(dev));
+ ret = devm_request_irq(dev, irq, dma_irq_handler, 0, irq_name,
+ ecc);
+ if (ret) {
+ dev_err(dev, "CCINT (%d) failed --> %d\n", irq, ret);
+ return ret;
+ }
+ }
+
+ irq = platform_get_irq_byname(pdev, "edma3_ccerrint");
+ if (irq < 0 && node)
+ irq = irq_of_parse_and_map(node, 2);
+
+ if (irq >= 0) {
+ irq_name = devm_kasprintf(dev, GFP_KERNEL, "%s_ccerrint",
+ dev_name(dev));
+ ret = devm_request_irq(dev, irq, dma_ccerr_handler, 0, irq_name,
+ ecc);
+ if (ret) {
+ dev_err(dev, "CCERRINT (%d) failed --> %d\n", irq, ret);
+ return ret;
+ }
+ }
+
+ for (i = 0; i < ecc->num_channels; i++)
+ edma_map_dmach_to_queue(ecc, i, info->default_queue);
+
+ queue_priority_mapping = info->queue_priority_mapping;
+
+ /* Event queue priority mapping */
+ for (i = 0; queue_priority_mapping[i][0] != -1; i++)
+ edma_assign_priority_to_queue(ecc, queue_priority_mapping[i][0],
+ queue_priority_mapping[i][1]);
- ecc->ctlr = parent_pdev->id;
- if (ecc->ctlr < 0)
- ecc->ctlr = 0;
+ /* Map the channel to param entry if channel mapping logic exist */
+ if (edma_read(ecc, EDMA_CCCFG) & CHMAP_EXIST)
+ edma_direct_dmach_to_param_mapping(ecc);
- ecc->dummy_slot = edma_alloc_slot(ecc->cc, EDMA_SLOT_ANY);
+ for (i = 0; i < ecc->num_region; i++) {
+ edma_write_array2(ecc, EDMA_DRAE, i, 0, 0x0);
+ edma_write_array2(ecc, EDMA_DRAE, i, 1, 0x0);
+ edma_write_array(ecc, EDMA_QRAE, i, 0x0);
+ }
+ ecc->info = info;
+
+ ecc->dummy_slot = edma_alloc_slot(ecc, EDMA_SLOT_ANY);
if (ecc->dummy_slot < 0) {
dev_err(&pdev->dev, "Can't allocate PaRAM dummy slot\n");
return ecc->dummy_slot;
if (ret)
goto err_reg1;
- platform_set_drvdata(pdev, ecc);
-
- if (parent_node) {
- of_dma_controller_register(parent_node, of_dma_xlate_by_chan_id,
+ if (node)
+ of_dma_controller_register(node, of_dma_xlate_by_chan_id,
&ecc->dma_slave);
- }
dev_info(&pdev->dev, "TI EDMA DMA engine driver\n");
return 0;
err_reg1:
- edma_free_slot(ecc->cc, ecc->dummy_slot);
+ edma_free_slot(ecc, ecc->dummy_slot);
return ret;
}
{
struct device *dev = &pdev->dev;
struct edma_cc *ecc = dev_get_drvdata(dev);
- struct device_node *parent_node = pdev->dev.parent->of_node;
- if (parent_node)
- of_dma_controller_free(parent_node);
+ if (pdev->dev.of_node)
+ of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&ecc->dma_slave);
- edma_free_slot(ecc->cc, ecc->dummy_slot);
+ edma_free_slot(ecc, ecc->dummy_slot);
return 0;
}
+#ifdef CONFIG_PM_SLEEP
+static int edma_pm_resume(struct device *dev)
+{
+ struct edma_cc *ecc = dev_get_drvdata(dev);
+ int i;
+ s8 (*queue_priority_mapping)[2];
+
+ queue_priority_mapping = ecc->info->queue_priority_mapping;
+
+ /* Event queue priority mapping */
+ for (i = 0; queue_priority_mapping[i][0] != -1; i++)
+ edma_assign_priority_to_queue(ecc, queue_priority_mapping[i][0],
+ queue_priority_mapping[i][1]);
+
+ /* Map the channel to param entry if channel mapping logic */
+ if (edma_read(ecc, EDMA_CCCFG) & CHMAP_EXIST)
+ edma_direct_dmach_to_param_mapping(ecc);
+
+ for (i = 0; i < ecc->num_channels; i++) {
+ if (test_bit(i, ecc->edma_inuse)) {
+ /* ensure access through shadow region 0 */
+ edma_or_array2(ecc, EDMA_DRAE, 0, i >> 5,
+ BIT(i & 0x1f));
+
+ edma_setup_interrupt(ecc, EDMA_CTLR_CHAN(ecc->id, i),
+ ecc->intr_data[i].callback,
+ ecc->intr_data[i].data);
+ }
+ }
+
+ return 0;
+}
+#endif
+
+static const struct dev_pm_ops edma_pm_ops = {
+ SET_LATE_SYSTEM_SLEEP_PM_OPS(NULL, edma_pm_resume)
+};
+
static struct platform_driver edma_driver = {
.probe = edma_probe,
.remove = edma_remove,
.driver = {
- .name = "edma-dma-engine",
+ .name = "edma",
+ .pm = &edma_pm_ops,
+ .of_match_table = edma_of_ids,
},
};
projects / karo-tx-linux.git / commitdiff