* Copyright (c) 2010-2011 NVIDIA Corporation
* NVIDIA Corporation <www.nvidia.com>
*
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * 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 <common.h>
DECLARE_GLOBAL_DATA_PTR;
-static unsigned int i2c_bus_num;
-
/* Information about i2c controller */
struct i2c_bus {
int id;
struct i2c_control *control;
struct i2c_ctlr *regs;
int is_dvc; /* DVC type, rather than I2C */
+ int is_scs; /* single clock source (T114+) */
int inited; /* bus is inited */
};
* 16 to get the right frequency.
*/
clock_start_periph_pll(i2c_bus->periph_id, CLOCK_ID_PERIPH,
- i2c_bus->speed * 2 * 8);
+ i2c_bus->speed * 2 * 8);
+
+ if (i2c_bus->is_scs) {
+ /*
+ * T114 I2C went to a single clock source for standard/fast and
+ * HS clock speeds. The new clock rate setting calculation is:
+ * SCL = CLK_SOURCE.I2C /
+ * (CLK_MULT_STD_FAST_MODE * (I2C_CLK_DIV_STD_FAST_MODE+1) *
+ * I2C FREQUENCY DIVISOR) as per the T114 TRM (sec 30.3.1).
+ *
+ * NOTE: We do this here, after the initial clock/pll start,
+ * because if we read the clk_div reg before the controller
+ * is running, we hang, and we need it for the new calc.
+ */
+ int clk_div_stdfst_mode = readl(&i2c_bus->regs->clk_div) >> 16;
+ debug("%s: CLK_DIV_STD_FAST_MODE setting = %d\n", __func__,
+ clk_div_stdfst_mode);
+
+ clock_start_periph_pll(i2c_bus->periph_id, CLOCK_ID_PERIPH,
+ CLK_MULT_STD_FAST_MODE * (clk_div_stdfst_mode + 1) *
+ i2c_bus->speed * 2);
+ }
/* Reset I2C controller. */
i2c_reset_controller(i2c_bus);
static void send_packet_headers(
struct i2c_bus *i2c_bus,
struct i2c_trans_info *trans,
- u32 packet_id)
+ u32 packet_id,
+ bool end_with_repeated_start)
{
u32 data;
/* Enable Read if it is not a write transaction */
if (!(trans->flags & I2C_IS_WRITE))
data |= PKT_HDR3_READ_MODE_MASK;
+ if (end_with_repeated_start)
+ data |= PKT_HDR3_REPEAT_START_MASK;
/* Write I2C specific header */
writel(data, &i2c_bus->control->tx_fifo);
int_status = readl(&control->int_status);
writel(int_status, &control->int_status);
- send_packet_headers(i2c_bus, trans, 1);
+ send_packet_headers(i2c_bus, trans, 1,
+ trans->flags & I2C_USE_REPEATED_START);
words = DIV_ROUND_UP(trans->num_bytes, 4);
last_bytes = trans->num_bytes & 3;
if (is_write) {
/* deal with word alignment */
- if ((unsigned)dptr & 3) {
+ if ((words == 1) && last_bytes) {
+ local = 0;
+ memcpy(&local, dptr, last_bytes);
+ } else if ((unsigned)dptr & 3) {
memcpy(&local, dptr, sizeof(u32));
- writel(local, &control->tx_fifo);
- debug("pkt data sent (0x%x)\n", local);
} else {
- writel(*wptr, &control->tx_fifo);
- debug("pkt data sent (0x%x)\n", *wptr);
+ local = *wptr;
}
+ writel(local, &control->tx_fifo);
+ debug("pkt data sent (0x%x)\n", local);
if (!wait_for_tx_fifo_empty(control)) {
error = -1;
goto exit;
return error;
}
-static int tegra_i2c_write_data(u32 addr, u8 *data, u32 len)
+static int tegra_i2c_write_data(struct i2c_bus *bus, u32 addr, u8 *data,
+ u32 len, bool end_with_repeated_start)
{
int error;
struct i2c_trans_info trans_info;
trans_info.address = addr;
trans_info.buf = data;
trans_info.flags = I2C_IS_WRITE;
+ if (end_with_repeated_start)
+ trans_info.flags |= I2C_USE_REPEATED_START;
trans_info.num_bytes = len;
trans_info.is_10bit_address = 0;
- error = send_recv_packets(&i2c_controllers[i2c_bus_num], &trans_info);
+ error = send_recv_packets(bus, &trans_info);
if (error)
debug("tegra_i2c_write_data: Error (%d) !!!\n", error);
return error;
}
-static int tegra_i2c_read_data(u32 addr, u8 *data, u32 len)
+static int tegra_i2c_read_data(struct i2c_bus *bus, u32 addr, u8 *data,
+ u32 len)
{
int error;
struct i2c_trans_info trans_info;
trans_info.num_bytes = len;
trans_info.is_10bit_address = 0;
- error = send_recv_packets(&i2c_controllers[i2c_bus_num], &trans_info);
+ error = send_recv_packets(bus, &trans_info);
if (error)
debug("tegra_i2c_read_data: Error (%d) !!!\n", error);
#error "Please enable device tree support to use this driver"
#endif
-unsigned int i2c_get_bus_speed(void)
+/**
+ * Check that a bus number is valid and return a pointer to it
+ *
+ * @param bus_num Bus number to check / return
+ * @return pointer to bus, if valid, else NULL
+ */
+static struct i2c_bus *tegra_i2c_get_bus(struct i2c_adapter *adap)
{
- return i2c_controllers[i2c_bus_num].speed;
+ struct i2c_bus *bus;
+
+ bus = &i2c_controllers[adap->hwadapnr];
+ if (!bus->inited) {
+ debug("%s: Bus %u not available\n", __func__, adap->hwadapnr);
+ return NULL;
+ }
+
+ return bus;
}
-int i2c_set_bus_speed(unsigned int speed)
+static unsigned int tegra_i2c_set_bus_speed(struct i2c_adapter *adap,
+ unsigned int speed)
{
- struct i2c_bus *i2c_bus;
+ struct i2c_bus *bus;
- i2c_bus = &i2c_controllers[i2c_bus_num];
- i2c_bus->speed = speed;
- i2c_init_controller(i2c_bus);
+ bus = tegra_i2c_get_bus(adap);
+ if (!bus)
+ return 0;
+ bus->speed = speed;
+ i2c_init_controller(bus);
return 0;
}
* @param node_list list of nodes to process (any <=0 are ignored)
* @param count number of nodes to process
* @param is_dvc 1 if these are DVC ports, 0 if standard I2C
+ * @param is_scs 1 if this HW uses a single clock source (T114+)
* @return 0 if ok, -1 on error
*/
static int process_nodes(const void *blob, int node_list[], int count,
- int is_dvc)
+ int is_dvc, int is_scs)
{
struct i2c_bus *i2c_bus;
int i;
return -1;
}
+ i2c_bus->is_scs = is_scs;
+
i2c_bus->is_dvc = is_dvc;
if (is_dvc) {
i2c_bus->control =
const void *blob = gd->fdt_blob;
int count;
- /* First get the normal i2c ports */
+ /* First check for newer (T114+) I2C ports */
+ count = fdtdec_find_aliases_for_id(blob, "i2c",
+ COMPAT_NVIDIA_TEGRA114_I2C, node_list,
+ TEGRA_I2C_NUM_CONTROLLERS);
+ if (process_nodes(blob, node_list, count, 0, 1))
+ return;
+
+ /* Now get the older (T20/T30) normal I2C ports */
count = fdtdec_find_aliases_for_id(blob, "i2c",
COMPAT_NVIDIA_TEGRA20_I2C, node_list,
TEGRA_I2C_NUM_CONTROLLERS);
- if (process_nodes(blob, node_list, count, 0))
+ if (process_nodes(blob, node_list, count, 0, 0))
return;
/* Now look for dvc ports */
count = fdtdec_add_aliases_for_id(blob, "i2c",
COMPAT_NVIDIA_TEGRA20_DVC, node_list,
TEGRA_I2C_NUM_CONTROLLERS);
- if (process_nodes(blob, node_list, count, 1))
+ if (process_nodes(blob, node_list, count, 1, 0))
return;
}
-void i2c_init(int speed, int slaveaddr)
+static void tegra_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr)
{
+ /* No i2c support prior to relocation */
+ if (!(gd->flags & GD_FLG_RELOC))
+ return;
+
/* This will override the speed selected in the fdt for that port */
debug("i2c_init(speed=%u, slaveaddr=0x%x)\n", speed, slaveaddr);
i2c_set_bus_speed(speed);
}
/* i2c write version without the register address */
-int i2c_write_data(uchar chip, uchar *buffer, int len)
+static int i2c_write_data(struct i2c_bus *bus, uchar chip, uchar *buffer,
+ int len, bool end_with_repeated_start)
{
int rc;
debug("\n");
/* Shift 7-bit address over for lower-level i2c functions */
- rc = tegra_i2c_write_data(chip << 1, buffer, len);
+ rc = tegra_i2c_write_data(bus, chip << 1, buffer, len,
+ end_with_repeated_start);
if (rc)
debug("i2c_write_data(): rc=%d\n", rc);
}
/* i2c read version without the register address */
-int i2c_read_data(uchar chip, uchar *buffer, int len)
+static int i2c_read_data(struct i2c_bus *bus, uchar chip, uchar *buffer,
+ int len)
{
int rc;
debug("inside i2c_read_data():\n");
/* Shift 7-bit address over for lower-level i2c functions */
- rc = tegra_i2c_read_data(chip << 1, buffer, len);
+ rc = tegra_i2c_read_data(bus, chip << 1, buffer, len);
if (rc) {
debug("i2c_read_data(): rc=%d\n", rc);
return rc;
}
/* Probe to see if a chip is present. */
-int i2c_probe(uchar chip)
+static int tegra_i2c_probe(struct i2c_adapter *adap, uchar chip)
{
+ struct i2c_bus *bus;
int rc;
uchar reg;
debug("i2c_probe: addr=0x%x\n", chip);
+ bus = tegra_i2c_get_bus(adap);
+ if (!bus)
+ return 1;
reg = 0;
- rc = i2c_write_data(chip, ®, 1);
+ rc = i2c_write_data(bus, chip, ®, 1, false);
if (rc) {
debug("Error probing 0x%x.\n", chip);
return 1;
}
/* Read bytes */
-int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
+static int tegra_i2c_read(struct i2c_adapter *adap, uchar chip, uint addr,
+ int alen, uchar *buffer, int len)
{
+ struct i2c_bus *bus;
uint offset;
int i;
- debug("i2c_read: chip=0x%x, addr=0x%x, len=0x%x\n",
- chip, addr, len);
+ debug("i2c_read: chip=0x%x, addr=0x%x, alen=0x%x len=0x%x\n",
+ chip, addr, alen, len);
+ bus = tegra_i2c_get_bus(adap);
+ if (!bus)
+ return 1;
if (!i2c_addr_ok(addr, alen)) {
debug("i2c_read: Bad address %x.%d.\n", addr, alen);
return 1;
data[alen - i - 1] =
(addr + offset) >> (8 * i);
}
- if (i2c_write_data(chip, data, alen)) {
+ if (i2c_write_data(bus, chip, data, alen, true)) {
debug("i2c_read: error sending (0x%x)\n",
addr);
return 1;
}
}
- if (i2c_read_data(chip, buffer + offset, 1)) {
+ if (i2c_read_data(bus, chip, buffer + offset, 1)) {
debug("i2c_read: error reading (0x%x)\n", addr);
return 1;
}
}
/* Write bytes */
-int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
+static int tegra_i2c_write(struct i2c_adapter *adap, uchar chip, uint addr,
+ int alen, uchar *buffer, int len)
{
+ struct i2c_bus *bus;
uint offset;
int i;
- debug("i2c_write: chip=0x%x, addr=0x%x, len=0x%x\n",
- chip, addr, len);
+ debug("i2c_write: chip=0x%x, addr=0x%x, alen=0x%x len=0x%x\n",
+ chip, addr, alen, len);
+ bus = tegra_i2c_get_bus(adap);
+ if (!bus)
+ return 1;
if (!i2c_addr_ok(addr, alen)) {
debug("i2c_write: Bad address %x.%d.\n", addr, alen);
return 1;
for (i = 0; i < alen; i++)
data[alen - i - 1] = (addr + offset) >> (8 * i);
data[alen] = buffer[offset];
- if (i2c_write_data(chip, data, alen + 1)) {
+ if (i2c_write_data(bus, chip, data, alen + 1, false)) {
debug("i2c_write: error sending (0x%x)\n", addr);
return 1;
}
return 0;
}
-#if defined(CONFIG_I2C_MULTI_BUS)
-/*
- * Functions for multiple I2C bus handling
- */
-unsigned int i2c_get_bus_num(void)
-{
- return i2c_bus_num;
-}
-
-int i2c_set_bus_num(unsigned int bus)
-{
- if (bus >= TEGRA_I2C_NUM_CONTROLLERS || !i2c_controllers[bus].inited)
- return -1;
- i2c_bus_num = bus;
-
- return 0;
-}
-#endif
-
int tegra_i2c_get_dvc_bus_num(void)
{
int i;
- for (i = 0; i < CONFIG_SYS_MAX_I2C_BUS; i++) {
+ for (i = 0; i < TEGRA_I2C_NUM_CONTROLLERS; i++) {
struct i2c_bus *bus = &i2c_controllers[i];
if (bus->inited && bus->is_dvc)
return -1;
}
+
+/*
+ * Register soft i2c adapters
+ */
+U_BOOT_I2C_ADAP_COMPLETE(tegra0, tegra_i2c_init, tegra_i2c_probe,
+ tegra_i2c_read, tegra_i2c_write,
+ tegra_i2c_set_bus_speed, 100000, 0, 0)
+U_BOOT_I2C_ADAP_COMPLETE(tegra1, tegra_i2c_init, tegra_i2c_probe,
+ tegra_i2c_read, tegra_i2c_write,
+ tegra_i2c_set_bus_speed, 100000, 0, 1)
+U_BOOT_I2C_ADAP_COMPLETE(tegra2, tegra_i2c_init, tegra_i2c_probe,
+ tegra_i2c_read, tegra_i2c_write,
+ tegra_i2c_set_bus_speed, 100000, 0, 2)
+U_BOOT_I2C_ADAP_COMPLETE(tegra3, tegra_i2c_init, tegra_i2c_probe,
+ tegra_i2c_read, tegra_i2c_write,
+ tegra_i2c_set_bus_speed, 100000, 0, 3)
+#if TEGRA_I2C_NUM_CONTROLLERS > 4
+U_BOOT_I2C_ADAP_COMPLETE(tegra4, tegra_i2c_init, tegra_i2c_probe,
+ tegra_i2c_read, tegra_i2c_write,
+ tegra_i2c_set_bus_speed, 100000, 0, 4)
+#endif
projects / karo-tx-uboot.git / blobdiff