X-Git-Url: https://git.kernelconcepts.de/?a=blobdiff_plain;f=drivers%2Fnet%2Ffec_mxc.c;h=b57247032fa85aaa65ec47c9fcf7668a4cd567df;hb=1fba907f9a8d178eee960294ecffc8ee8bc6b00d;hp=4dbcdca4a03741f5e3bfa3c334bb2fbcbbe8b7ea;hpb=03268374db9133686b738acca212247023840ffc;p=karo-tx-uboot.git diff --git a/drivers/net/fec_mxc.c b/drivers/net/fec_mxc.c index 4dbcdca4a0..b57247032f 100644 --- a/drivers/net/fec_mxc.c +++ b/drivers/net/fec_mxc.c @@ -5,25 +5,13 @@ * (C) Copyright 2007 Pengutronix, Sascha Hauer * (C) Copyright 2007 Pengutronix, Juergen Beisert * - * 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., 59 Temple Place, Suite 330, Boston, - * MA 02111-1307 USA + * SPDX-License-Identifier: GPL-2.0+ */ #include #include #include +#include #include #include "fec_mxc.h" @@ -41,6 +29,14 @@ DECLARE_GLOBAL_DATA_PTR; */ #define FEC_XFER_TIMEOUT 5000 +/* + * The standard 32-byte DMA alignment does not work on mx6solox, which requires + * 64-byte alignment in the DMA RX FEC buffer. + * Introduce the FEC_DMA_RX_MINALIGN which can cover mx6solox needs and also + * satisfies the alignment on other SoCs (32-bytes) + */ +#define FEC_DMA_RX_MINALIGN 64 + #ifndef CONFIG_MII #error "CONFIG_MII has to be defined!" #endif @@ -141,8 +137,12 @@ static void fec_mii_setspeed(struct ethernet_regs *eth) * Set MII_SPEED = (1/(mii_speed * 2)) * System Clock * and do not drop the Preamble. */ - writel((((imx_get_fecclk() / 1000000) + 2) / 5) << 1, - ð->mii_speed); + register u32 speed = DIV_ROUND_UP(imx_get_fecclk(), 5000000); +#ifdef FEC_QUIRK_ENET_MAC + speed--; +#endif + speed <<= 1; + writel(speed, ð->mii_speed); debug("%s: mii_speed %08x\n", __func__, readl(ð->mii_speed)); } @@ -180,13 +180,14 @@ static int fec_mdio_write(struct ethernet_regs *eth, uint8_t phyAddr, return 0; } -int fec_phy_read(struct mii_dev *bus, int phyAddr, int dev_addr, int regAddr) +static int fec_phy_read(struct mii_dev *bus, int phyAddr, int dev_addr, + int regAddr) { return fec_mdio_read(bus->priv, phyAddr, regAddr); } -int fec_phy_write(struct mii_dev *bus, int phyAddr, int dev_addr, int regAddr, - u16 data) +static int fec_phy_write(struct mii_dev *bus, int phyAddr, int dev_addr, + int regAddr, u16 data) { return fec_mdio_write(bus->priv, phyAddr, regAddr, data); } @@ -283,49 +284,34 @@ static int fec_tx_task_disable(struct fec_priv *fec) * @param[in] dsize desired size of each receive buffer * @return 0 on success * - * For this task we need additional memory for the data buffers. And each - * data buffer requires some alignment. Thy must be aligned to a specific - * boundary each. + * Init all RX descriptors to default values. */ -static int fec_rbd_init(struct fec_priv *fec, int count, int dsize) +static void fec_rbd_init(struct fec_priv *fec, int count, int dsize) { uint32_t size; + uint8_t *data; int i; /* - * Allocate memory for the buffers. This allocation respects the - * alignment + * Reload the RX descriptors with default values and wipe + * the RX buffers. */ size = roundup(dsize, ARCH_DMA_MINALIGN); for (i = 0; i < count; i++) { - uint32_t data_ptr = readl(&fec->rbd_base[i].data_pointer); - if (data_ptr == 0) { - uint8_t *data = memalign(ARCH_DMA_MINALIGN, - size); - if (!data) { - printf("%s: error allocating rxbuf %d\n", - __func__, i); - goto err; - } - writel((uint32_t)data, &fec->rbd_base[i].data_pointer); - } /* needs allocation */ - writew(FEC_RBD_EMPTY, &fec->rbd_base[i].status); - writew(0, &fec->rbd_base[i].data_length); + data = (uint8_t *)fec->rbd_base[i].data_pointer; + memset(data, 0, dsize); + flush_dcache_range((uint32_t)data, (uint32_t)data + size); + + fec->rbd_base[i].status = FEC_RBD_EMPTY; + fec->rbd_base[i].data_length = 0; } /* Mark the last RBD to close the ring. */ - writew(FEC_RBD_WRAP | FEC_RBD_EMPTY, &fec->rbd_base[i - 1].status); + fec->rbd_base[i - 1].status = FEC_RBD_WRAP | FEC_RBD_EMPTY; fec->rbd_index = 0; - return 0; - -err: - for (; i >= 0; i--) { - uint32_t data_ptr = readl(&fec->rbd_base[i].data_pointer); - free((void *)data_ptr); - } - - return -ENOMEM; + flush_dcache_range((unsigned)fec->rbd_base, + (unsigned)fec->rbd_base + size); } /** @@ -345,10 +331,12 @@ static void fec_tbd_init(struct fec_priv *fec) unsigned addr = (unsigned)fec->tbd_base; unsigned size = roundup(2 * sizeof(struct fec_bd), ARCH_DMA_MINALIGN); - writew(0x0000, &fec->tbd_base[0].status); - writew(FEC_TBD_WRAP, &fec->tbd_base[1].status); + + memset(fec->tbd_base, 0, size); + fec->tbd_base[0].status = 0; + fec->tbd_base[1].status = FEC_TBD_WRAP; fec->tbd_index = 0; - flush_dcache_range(addr, addr+size); + flush_dcache_range(addr, addr + size); } /** @@ -466,7 +454,7 @@ static int fec_open(struct eth_device *edev) */ writel(readl(&fec->eth->ecntrl) | FEC_ECNTRL_ETHER_EN, &fec->eth->ecntrl); -#if defined(CONFIG_MX25) || defined(CONFIG_MX53) +#if defined(CONFIG_MX25) || defined(CONFIG_MX53) || defined(CONFIG_MX6SL) udelay(100); /* * setup the MII gasket for RMII mode @@ -516,9 +504,7 @@ static int fec_open(struct eth_device *edev) #ifdef FEC_QUIRK_ENET_MAC { u32 ecr = readl(&fec->eth->ecntrl) & ~FEC_ECNTRL_SPEED; - u32 rcr = (readl(&fec->eth->r_cntrl) & - ~(FEC_RCNTRL_RMII | FEC_RCNTRL_RMII_10T)) | - FEC_RCNTRL_RGMII | FEC_RCNTRL_MII_MODE; + u32 rcr = readl(&fec->eth->r_cntrl) & ~FEC_RCNTRL_RMII_10T; if (speed == _1000BASET) ecr |= FEC_ECNTRL_SPEED; else if (speed != _100BASET) @@ -542,52 +528,18 @@ static int fec_init(struct eth_device *dev, bd_t* bd) { struct fec_priv *fec = (struct fec_priv *)dev->priv; uint32_t mib_ptr = (uint32_t)&fec->eth->rmon_t_drop; - uint32_t size; - int i, ret; + int i; /* Initialize MAC address */ fec_set_hwaddr(dev); /* - * Allocate transmit descriptors, there are two in total. This - * allocation respects cache alignment. + * Setup transmit descriptors, there are two in total. */ - if (!fec->tbd_base) { - size = roundup(2 * sizeof(struct fec_bd), - ARCH_DMA_MINALIGN); - fec->tbd_base = memalign(ARCH_DMA_MINALIGN, size); - if (!fec->tbd_base) { - ret = -ENOMEM; - goto err1; - } - memset(fec->tbd_base, 0, size); - fec_tbd_init(fec); - flush_dcache_range((unsigned)fec->tbd_base, size); - } + fec_tbd_init(fec); - /* - * Allocate receive descriptors. This allocation respects cache - * alignment. - */ - if (!fec->rbd_base) { - size = roundup(FEC_RBD_NUM * sizeof(struct fec_bd), - ARCH_DMA_MINALIGN); - fec->rbd_base = memalign(ARCH_DMA_MINALIGN, size); - if (!fec->rbd_base) { - ret = -ENOMEM; - goto err2; - } - memset(fec->rbd_base, 0, size); - /* - * Initialize RxBD ring - */ - if (fec_rbd_init(fec, FEC_RBD_NUM, FEC_MAX_PKT_SIZE) < 0) { - ret = -ENOMEM; - goto err3; - } - flush_dcache_range((unsigned)fec->rbd_base, - (unsigned)fec->rbd_base + size); - } + /* Setup receive descriptors. */ + fec_rbd_init(fec, FEC_RBD_NUM, FEC_MAX_PKT_SIZE); fec_reg_setup(fec); @@ -624,13 +576,6 @@ static int fec_init(struct eth_device *dev, bd_t* bd) #endif fec_open(dev); return 0; - -err3: - free(fec->rbd_base); -err2: - free(fec->tbd_base); -err1: - return ret; } /** @@ -739,6 +684,28 @@ static int fec_send(struct eth_device *dev, void *packet, int length) addr = (uint32_t)fec->tbd_base; flush_dcache_range(addr, addr + size); + /* + * Below we read the DMA descriptor's last four bytes back from the + * DRAM. This is important in order to make sure that all WRITE + * operations on the bus that were triggered by previous cache FLUSH + * have completed. + * + * Otherwise, on MX28, it is possible to observe a corruption of the + * DMA descriptors. Please refer to schematic "Figure 1-2" in MX28RM + * for the bus structure of MX28. The scenario is as follows: + * + * 1) ARM core triggers a series of WRITEs on the AHB_ARB2 bus going + * to DRAM due to flush_dcache_range() + * 2) ARM core writes the FEC registers via AHB_ARB2 + * 3) FEC DMA starts reading/writing from/to DRAM via AHB_ARB3 + * + * Note that 2) does sometimes finish before 1) due to reordering of + * WRITE accesses on the AHB bus, therefore triggering 3) before the + * DMA descriptor is fully written into DRAM. This results in occasional + * corruption of the DMA descriptor. + */ + readl(addr + size - 4); + /* * Enable SmartDMA transmit task */ @@ -754,13 +721,37 @@ static int fec_send(struct eth_device *dev, void *packet, int length) break; } - if (!timeout) + if (!timeout) { ret = -EINVAL; + goto out; + } - invalidate_dcache_range(addr, addr + size); - if (readw(&fec->tbd_base[fec->tbd_index].status) & FEC_TBD_READY) + /* + * The TDAR bit is cleared when the descriptors are all out from TX + * but on mx6solox we noticed that the READY bit is still not cleared + * right after TDAR. + * These are two distinct signals, and in IC simulation, we found that + * TDAR always gets cleared prior than the READY bit of last BD becomes + * cleared. + * In mx6solox, we use a later version of FEC IP. It looks like that + * this intrinsic behaviour of TDAR bit has changed in this newer FEC + * version. + * + * Fix this by polling the READY bit of BD after the TDAR polling, + * which covers the mx6solox case and does not harm the other SoCs. + */ + timeout = FEC_XFER_TIMEOUT; + while (--timeout) { + invalidate_dcache_range(addr, addr + size); + if (!(readw(&fec->tbd_base[fec->tbd_index].status) & + FEC_TBD_READY)) + break; + } + + if (!timeout) ret = -EINVAL; +out: debug("fec_send: status 0x%x index %d ret %i\n", readw(&fec->tbd_base[fec->tbd_index].status), fec->tbd_index, ret); @@ -788,7 +779,7 @@ static int fec_recv(struct eth_device *dev) uint16_t bd_status; uint32_t addr, size, end; int i; - uchar buff[FEC_MAX_PKT_SIZE] __aligned(ARCH_DMA_MINALIGN); + ALLOC_CACHE_ALIGN_BUFFER(uchar, buff, FEC_MAX_PKT_SIZE); /* * Check if any critical events have happened @@ -901,6 +892,74 @@ static void fec_set_dev_name(char *dest, int dev_id) sprintf(dest, (dev_id == -1) ? "FEC" : "FEC%i", dev_id); } +static int fec_alloc_descs(struct fec_priv *fec) +{ + unsigned int size; + int i; + uint8_t *data; + + /* Allocate TX descriptors. */ + size = roundup(2 * sizeof(struct fec_bd), ARCH_DMA_MINALIGN); + fec->tbd_base = memalign(ARCH_DMA_MINALIGN, size); + if (!fec->tbd_base) + goto err_tx; + + /* Allocate RX descriptors. */ + size = roundup(FEC_RBD_NUM * sizeof(struct fec_bd), ARCH_DMA_MINALIGN); + fec->rbd_base = memalign(ARCH_DMA_MINALIGN, size); + if (!fec->rbd_base) + goto err_rx; + + memset(fec->rbd_base, 0, size); + + /* Allocate RX buffers. */ + + /* Maximum RX buffer size. */ + size = roundup(FEC_MAX_PKT_SIZE, FEC_DMA_RX_MINALIGN); + for (i = 0; i < FEC_RBD_NUM; i++) { + data = memalign(FEC_DMA_RX_MINALIGN, size); + if (!data) { + printf("%s: error allocating rxbuf %d\n", __func__, i); + goto err_ring; + } + + memset(data, 0, size); + + fec->rbd_base[i].data_pointer = (uint32_t)data; + fec->rbd_base[i].status = FEC_RBD_EMPTY; + fec->rbd_base[i].data_length = 0; + /* Flush the buffer to memory. */ + flush_dcache_range((uint32_t)data, (uint32_t)data + size); + } + + /* Mark the last RBD to close the ring. */ + fec->rbd_base[i - 1].status = FEC_RBD_WRAP | FEC_RBD_EMPTY; + + fec->rbd_index = 0; + fec->tbd_index = 0; + + return 0; + +err_ring: + for (; i >= 0; i--) + free((void *)fec->rbd_base[i].data_pointer); + free(fec->rbd_base); +err_rx: + free(fec->tbd_base); +err_tx: + return -ENOMEM; +} + +static void fec_free_descs(struct fec_priv *fec) +{ + int i; + + for (i = 0; i < FEC_RBD_NUM; i++) + free((void *)fec->rbd_base[i].data_pointer); + free(fec->rbd_base); + free(fec->tbd_base); +} + #ifdef CONFIG_PHYLIB int fec_probe(bd_t *bd, int dev_id, uint32_t base_addr, struct mii_dev *bus, struct phy_device *phydev) @@ -933,6 +992,10 @@ static int fec_probe(bd_t *bd, int dev_id, uint32_t base_addr, memset(edev, 0, sizeof(*edev)); memset(fec, 0, sizeof(*fec)); + ret = fec_alloc_descs(fec); + if (ret) + goto err3; + edev->priv = fec; edev->init = fec_init; edev->send = fec_send; @@ -951,7 +1014,7 @@ static int fec_probe(bd_t *bd, int dev_id, uint32_t base_addr, while (readl(&fec->eth->ecntrl) & FEC_ECNTRL_RESET) { if (get_timer(start) > (CONFIG_SYS_HZ * 5)) { printf("FEC MXC: Timeout reseting chip\n"); - goto err3; + goto err4; } udelay(10); } @@ -974,8 +1037,12 @@ static int fec_probe(bd_t *bd, int dev_id, uint32_t base_addr, if (fec_get_hwaddr(edev, dev_id, ethaddr) == 0) { debug("got MAC%d address from fuse: %pM\n", dev_id, ethaddr); memcpy(edev->enetaddr, ethaddr, 6); + if (!getenv("ethaddr")) + eth_setenv_enetaddr("ethaddr", ethaddr); } return ret; +err4: + fec_free_descs(fec); err3: free(fec); err2: