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u-boot/drivers/i2c/mxc_i2c.c
Fabio Estevam 371be1e012 i2c: mxc_i2c: Use hex notation for the base address 
Printing the I2C controller base address in decimal notation
is not helpful.

Change it to hex notation, which is the standard format found
in the Reference Manual and devicetree.

Signed-off-by: Fabio Estevam <festevam@denx.de>
Acked-by: Dhruva Gole <d-gole@ti.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
2023-02-13 09:57:30 +01:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* i2c driver for Freescale i.MX series
*
* (c) 2007 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
* (c) 2011 Marek Vasut <marek.vasut@gmail.com>
* Copyright 2020 NXP
*
* Based on i2c-imx.c from linux kernel:
* Copyright (C) 2005 Torsten Koschorrek <koschorrek at synertronixx.de>
* Copyright (C) 2005 Matthias Blaschke <blaschke at synertronixx.de>
* Copyright (C) 2007 RightHand Technologies, Inc.
* Copyright (C) 2008 Darius Augulis <darius.augulis at teltonika.lt>
*
*/
#include <common.h>
#include <log.h>
#include <asm/arch/clock.h>
#include <asm/arch/imx-regs.h>
#include <asm/global_data.h>
#include <dm/device_compat.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <asm/mach-imx/mxc_i2c.h>
#include <asm/mach-imx/sys_proto.h>
#include <asm/io.h>
#include <i2c.h>
#include <watchdog.h>
#include <dm.h>
#include <dm/pinctrl.h>
#include <fdtdec.h>
DECLARE_GLOBAL_DATA_PTR;
#define I2C_QUIRK_FLAG (1 << 0)
#define IMX_I2C_REGSHIFT 2
#define VF610_I2C_REGSHIFT 0
#define I2C_EARLY_INIT_INDEX 0
#ifdef CFG_SYS_I2C_IFDR_DIV
#define I2C_IFDR_DIV_CONSERVATIVE CFG_SYS_I2C_IFDR_DIV
#else
#define I2C_IFDR_DIV_CONSERVATIVE 0x7e
#endif
/* Register index */
#define IADR 0
#define IFDR 1
#define I2CR 2
#define I2SR 3
#define I2DR 4
#define I2CR_IIEN (1 << 6)
#define I2CR_MSTA (1 << 5)
#define I2CR_MTX (1 << 4)
#define I2CR_TX_NO_AK (1 << 3)
#define I2CR_RSTA (1 << 2)
#define I2SR_ICF (1 << 7)
#define I2SR_IBB (1 << 5)
#define I2SR_IAL (1 << 4)
#define I2SR_IIF (1 << 1)
#define I2SR_RX_NO_AK (1 << 0)
#ifdef I2C_QUIRK_REG
#define I2CR_IEN (0 << 7)
#define I2CR_IDIS (1 << 7)
#define I2SR_IIF_CLEAR (1 << 1)
#else
#define I2CR_IEN (1 << 7)
#define I2CR_IDIS (0 << 7)
#define I2SR_IIF_CLEAR (0 << 1)
#endif
#ifdef I2C_QUIRK_REG
static u16 i2c_clk_div[60][2] = {
{ 20, 0x00 }, { 22, 0x01 }, { 24, 0x02 }, { 26, 0x03 },
{ 28, 0x04 }, { 30, 0x05 }, { 32, 0x09 }, { 34, 0x06 },
{ 36, 0x0A }, { 40, 0x07 }, { 44, 0x0C }, { 48, 0x0D },
{ 52, 0x43 }, { 56, 0x0E }, { 60, 0x45 }, { 64, 0x12 },
{ 68, 0x0F }, { 72, 0x13 }, { 80, 0x14 }, { 88, 0x15 },
{ 96, 0x19 }, { 104, 0x16 }, { 112, 0x1A }, { 128, 0x17 },
{ 136, 0x4F }, { 144, 0x1C }, { 160, 0x1D }, { 176, 0x55 },
{ 192, 0x1E }, { 208, 0x56 }, { 224, 0x22 }, { 228, 0x24 },
{ 240, 0x1F }, { 256, 0x23 }, { 288, 0x5C }, { 320, 0x25 },
{ 384, 0x26 }, { 448, 0x2A }, { 480, 0x27 }, { 512, 0x2B },
{ 576, 0x2C }, { 640, 0x2D }, { 768, 0x31 }, { 896, 0x32 },
{ 960, 0x2F }, { 1024, 0x33 }, { 1152, 0x34 }, { 1280, 0x35 },
{ 1536, 0x36 }, { 1792, 0x3A }, { 1920, 0x37 }, { 2048, 0x3B },
{ 2304, 0x3C }, { 2560, 0x3D }, { 3072, 0x3E }, { 3584, 0x7A },
{ 3840, 0x3F }, { 4096, 0x7B }, { 5120, 0x7D }, { 6144, 0x7E },
};
#else
static u16 i2c_clk_div[50][2] = {
{ 22, 0x20 }, { 24, 0x21 }, { 26, 0x22 }, { 28, 0x23 },
{ 30, 0x00 }, { 32, 0x24 }, { 36, 0x25 }, { 40, 0x26 },
{ 42, 0x03 }, { 44, 0x27 }, { 48, 0x28 }, { 52, 0x05 },
{ 56, 0x29 }, { 60, 0x06 }, { 64, 0x2A }, { 72, 0x2B },
{ 80, 0x2C }, { 88, 0x09 }, { 96, 0x2D }, { 104, 0x0A },
{ 112, 0x2E }, { 128, 0x2F }, { 144, 0x0C }, { 160, 0x30 },
{ 192, 0x31 }, { 224, 0x32 }, { 240, 0x0F }, { 256, 0x33 },
{ 288, 0x10 }, { 320, 0x34 }, { 384, 0x35 }, { 448, 0x36 },
{ 480, 0x13 }, { 512, 0x37 }, { 576, 0x14 }, { 640, 0x38 },
{ 768, 0x39 }, { 896, 0x3A }, { 960, 0x17 }, { 1024, 0x3B },
{ 1152, 0x18 }, { 1280, 0x3C }, { 1536, 0x3D }, { 1792, 0x3E },
{ 1920, 0x1B }, { 2048, 0x3F }, { 2304, 0x1C }, { 2560, 0x1D },
{ 3072, 0x1E }, { 3840, 0x1F }
};
#endif
/*
* Calculate and set proper clock divider
*/
static uint8_t i2c_imx_get_clk(struct mxc_i2c_bus *i2c_bus, unsigned int rate)
{
unsigned int i2c_clk_rate;
unsigned int div;
u8 clk_div;
#if defined(CONFIG_MX31)
struct clock_control_regs *sc_regs =
(struct clock_control_regs *)CCM_BASE;
/* start the required I2C clock */
writel(readl(&sc_regs->cgr0) | (3 << CONFIG_SYS_I2C_CLK_OFFSET),
&sc_regs->cgr0);
#endif
/* Divider value calculation */
#if CONFIG_IS_ENABLED(CLK)
i2c_clk_rate = clk_get_rate(&i2c_bus->per_clk);
#else
i2c_clk_rate = mxc_get_clock(MXC_I2C_CLK);
#endif
div = (i2c_clk_rate + rate - 1) / rate;
if (div < i2c_clk_div[0][0])
clk_div = 0;
else if (div > i2c_clk_div[ARRAY_SIZE(i2c_clk_div) - 1][0])
clk_div = ARRAY_SIZE(i2c_clk_div) - 1;
else
for (clk_div = 0; i2c_clk_div[clk_div][0] < div; clk_div++)
;
/* Store divider value */
return clk_div;
}
/*
* Set I2C Bus speed
*/
static int bus_i2c_set_bus_speed(struct mxc_i2c_bus *i2c_bus, int speed)
{
ulong base = i2c_bus->base;
bool quirk = i2c_bus->driver_data & I2C_QUIRK_FLAG ? true : false;
u8 clk_idx = i2c_imx_get_clk(i2c_bus, speed);
u8 idx = i2c_clk_div[clk_idx][1];
int reg_shift = quirk ? VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
if (!base)
return -EINVAL;
/* Store divider value */
writeb(idx, base + (IFDR << reg_shift));
/* Reset module */
writeb(I2CR_IDIS, base + (I2CR << reg_shift));
writeb(0, base + (I2SR << reg_shift));
return 0;
}
#define ST_BUS_IDLE (0 | (I2SR_IBB << 8))
#define ST_BUS_BUSY (I2SR_IBB | (I2SR_IBB << 8))
#define ST_IIF (I2SR_IIF | (I2SR_IIF << 8))
static int wait_for_sr_state(struct mxc_i2c_bus *i2c_bus, unsigned state)
{
unsigned sr;
ulong elapsed;
bool quirk = i2c_bus->driver_data & I2C_QUIRK_FLAG ? true : false;
int reg_shift = quirk ? VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
ulong base = i2c_bus->base;
ulong start_time = get_timer(0);
for (;;) {
sr = readb(base + (I2SR << reg_shift));
if (sr & I2SR_IAL) {
if (quirk)
writeb(sr | I2SR_IAL, base +
(I2SR << reg_shift));
else
writeb(sr & ~I2SR_IAL, base +
(I2SR << reg_shift));
printf("%s: Arbitration lost sr=%x cr=%x state=%x\n",
__func__, sr, readb(base + (I2CR << reg_shift)),
state);
return -ERESTART;
}
if ((sr & (state >> 8)) == (unsigned char)state)
return sr;
schedule();
elapsed = get_timer(start_time);
if (elapsed > (CONFIG_SYS_HZ / 10)) /* .1 seconds */
break;
}
printf("%s: failed sr=%x cr=%x state=%x\n", __func__,
sr, readb(base + (I2CR << reg_shift)), state);
return -ETIMEDOUT;
}
static int tx_byte(struct mxc_i2c_bus *i2c_bus, u8 byte)
{
int ret;
int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ?
VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
ulong base = i2c_bus->base;
writeb(I2SR_IIF_CLEAR, base + (I2SR << reg_shift));
writeb(byte, base + (I2DR << reg_shift));
ret = wait_for_sr_state(i2c_bus, ST_IIF);
if (ret < 0)
return ret;
if (ret & I2SR_RX_NO_AK)
return -EREMOTEIO;
return 0;
}
/*
* Stub implementations for outer i2c slave operations.
*/
void __i2c_force_reset_slave(void)
{
}
void i2c_force_reset_slave(void)
__attribute__((weak, alias("__i2c_force_reset_slave")));
/*
* Stop I2C transaction
*/
static void i2c_imx_stop(struct mxc_i2c_bus *i2c_bus)
{
int ret;
int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ?
VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
ulong base = i2c_bus->base;
unsigned int temp = readb(base + (I2CR << reg_shift));
temp &= ~(I2CR_MSTA | I2CR_MTX);
writeb(temp, base + (I2CR << reg_shift));
ret = wait_for_sr_state(i2c_bus, ST_BUS_IDLE);
if (ret < 0)
printf("%s:trigger stop failed\n", __func__);
}
/*
* Send start signal, chip address and
* write register address
*/
static int i2c_init_transfer_(struct mxc_i2c_bus *i2c_bus, u8 chip,
u32 addr, int alen)
{
unsigned int temp;
int ret;
bool quirk = i2c_bus->driver_data & I2C_QUIRK_FLAG ? true : false;
ulong base = i2c_bus->base;
int reg_shift = quirk ? VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
/* Reset i2c slave */
i2c_force_reset_slave();
/* Enable I2C controller */
if (quirk)
ret = readb(base + (I2CR << reg_shift)) & I2CR_IDIS;
else
ret = !(readb(base + (I2CR << reg_shift)) & I2CR_IEN);
if (ret) {
writeb(I2CR_IEN, base + (I2CR << reg_shift));
/* Wait for controller to be stable */
udelay(50);
}
if (readb(base + (IADR << reg_shift)) == (chip << 1))
writeb((chip << 1) ^ 2, base + (IADR << reg_shift));
writeb(I2SR_IIF_CLEAR, base + (I2SR << reg_shift));
ret = wait_for_sr_state(i2c_bus, ST_BUS_IDLE);
if (ret < 0)
return ret;
/* Start I2C transaction */
temp = readb(base + (I2CR << reg_shift));
temp |= I2CR_MSTA;
writeb(temp, base + (I2CR << reg_shift));
ret = wait_for_sr_state(i2c_bus, ST_BUS_BUSY);
if (ret < 0)
return ret;
temp |= I2CR_MTX | I2CR_TX_NO_AK;
writeb(temp, base + (I2CR << reg_shift));
if (alen >= 0) {
/* write slave address */
ret = tx_byte(i2c_bus, chip << 1);
if (ret < 0)
return ret;
while (alen--) {
ret = tx_byte(i2c_bus, (addr >> (alen * 8)) & 0xff);
if (ret < 0)
return ret;
}
}
return 0;
}
#if !defined(I2C2_BASE_ADDR)
#define I2C2_BASE_ADDR 0
#endif
#if !defined(I2C3_BASE_ADDR)
#define I2C3_BASE_ADDR 0
#endif
#if !defined(I2C4_BASE_ADDR)
#define I2C4_BASE_ADDR 0
#endif
#if !defined(I2C5_BASE_ADDR)
#define I2C5_BASE_ADDR 0
#endif
#if !defined(I2C6_BASE_ADDR)
#define I2C6_BASE_ADDR 0
#endif
#if !defined(I2C7_BASE_ADDR)
#define I2C7_BASE_ADDR 0
#endif
#if !defined(I2C8_BASE_ADDR)
#define I2C8_BASE_ADDR 0
#endif
static struct mxc_i2c_bus mxc_i2c_buses[] = {
#if defined(CONFIG_ARCH_LS1021A) || defined(CONFIG_VF610) || \
defined(CONFIG_FSL_LAYERSCAPE)
{ 0, I2C1_BASE_ADDR, I2C_QUIRK_FLAG },
{ 1, I2C2_BASE_ADDR, I2C_QUIRK_FLAG },
{ 2, I2C3_BASE_ADDR, I2C_QUIRK_FLAG },
{ 3, I2C4_BASE_ADDR, I2C_QUIRK_FLAG },
{ 4, I2C5_BASE_ADDR, I2C_QUIRK_FLAG },
{ 5, I2C6_BASE_ADDR, I2C_QUIRK_FLAG },
{ 6, I2C7_BASE_ADDR, I2C_QUIRK_FLAG },
{ 7, I2C8_BASE_ADDR, I2C_QUIRK_FLAG },
#else
{ 0, I2C1_BASE_ADDR, 0 },
{ 1, I2C2_BASE_ADDR, 0 },
{ 2, I2C3_BASE_ADDR, 0 },
{ 3, I2C4_BASE_ADDR, 0 },
{ 4, I2C5_BASE_ADDR, 0 },
{ 5, I2C6_BASE_ADDR, 0 },
{ 6, I2C7_BASE_ADDR, 0 },
{ 7, I2C8_BASE_ADDR, 0 },
#endif
};
#if !CONFIG_IS_ENABLED(DM_I2C)
int i2c_idle_bus(struct mxc_i2c_bus *i2c_bus)
{
if (i2c_bus && i2c_bus->idle_bus_fn)
return i2c_bus->idle_bus_fn(i2c_bus->idle_bus_data);
return 0;
}
#else
/*
* See Linux Documentation/devicetree/bindings/i2c/i2c-imx.txt
* "
* scl-gpios: specify the gpio related to SCL pin
* sda-gpios: specify the gpio related to SDA pin
* add pinctrl to configure i2c pins to gpio function for i2c
* bus recovery, call it "gpio" state
* "
*
* The i2c_idle_bus is an implementation following Linux Kernel.
*/
int i2c_idle_bus(struct mxc_i2c_bus *i2c_bus)
{
struct udevice *bus = i2c_bus->bus;
struct dm_i2c_bus *i2c = dev_get_uclass_priv(bus);
struct gpio_desc *scl_gpio = &i2c_bus->scl_gpio;
struct gpio_desc *sda_gpio = &i2c_bus->sda_gpio;
int sda, scl, idle_sclks;
int i, ret = 0;
ulong elapsed, start_time;
if (pinctrl_select_state(bus, "gpio")) {
dev_dbg(bus, "Can not to switch to use gpio pinmux\n");
/*
* GPIO pinctrl for i2c force idle is not a must,
* but it is strongly recommended to be used.
* Because it can help you to recover from bad
* i2c bus state. Do not return failure, because
* it is not a must.
*/
return 0;
}
dm_gpio_set_dir_flags(scl_gpio, GPIOD_IS_IN);
dm_gpio_set_dir_flags(sda_gpio, GPIOD_IS_IN);
scl = dm_gpio_get_value(scl_gpio);
sda = dm_gpio_get_value(sda_gpio);
if ((sda & scl) == 1)
goto exit; /* Bus is idle already */
/*
* In most cases it is just enough to generate 8 + 1 SCLK
* clocks to recover I2C slave device from 'stuck' state
* (when for example SW reset was performed, in the middle of
* I2C transmission).
*
* However, there are devices which send data in packets of
* N bytes (N > 1). In such case we do need N * 8 + 1 SCLK
* clocks.
*/
idle_sclks = 8 + 1;
if (i2c->max_transaction_bytes > 0)
idle_sclks = i2c->max_transaction_bytes * 8 + 1;
/* Send high and low on the SCL line */
for (i = 0; i < idle_sclks; i++) {
dm_gpio_set_dir_flags(scl_gpio, GPIOD_IS_OUT);
dm_gpio_set_value(scl_gpio, 0);
udelay(50);
dm_gpio_set_dir_flags(scl_gpio, GPIOD_IS_IN);
udelay(50);
}
start_time = get_timer(0);
for (;;) {
dm_gpio_set_dir_flags(scl_gpio, GPIOD_IS_IN);
dm_gpio_set_dir_flags(sda_gpio, GPIOD_IS_IN);
scl = dm_gpio_get_value(scl_gpio);
sda = dm_gpio_get_value(sda_gpio);
if ((sda & scl) == 1)
break;
schedule();
elapsed = get_timer(start_time);
if (elapsed > (CONFIG_SYS_HZ / 5)) { /* .2 seconds */
ret = -EBUSY;
printf("%s: failed to clear bus, sda=%d scl=%d\n", __func__, sda, scl);
break;
}
}
exit:
pinctrl_select_state(bus, "default");
return ret;
}
#endif
/*
* Early init I2C for prepare read the clk through I2C.
*/
void i2c_early_init_f(void)
{
ulong base = mxc_i2c_buses[I2C_EARLY_INIT_INDEX].base;
bool quirk = mxc_i2c_buses[I2C_EARLY_INIT_INDEX].driver_data
& I2C_QUIRK_FLAG ? true : false;
int reg_shift = quirk ? VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
/* Set I2C divider value */
writeb(I2C_IFDR_DIV_CONSERVATIVE, base + (IFDR << reg_shift));
/* Reset module */
writeb(I2CR_IDIS, base + (I2CR << reg_shift));
writeb(0, base + (I2SR << reg_shift));
/* Enable I2C */
writeb(I2CR_IEN, base + (I2CR << reg_shift));
}
static int i2c_init_transfer(struct mxc_i2c_bus *i2c_bus, u8 chip,
u32 addr, int alen)
{
int retry;
int ret;
int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ?
VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
if (!i2c_bus->base)
return -EINVAL;
for (retry = 0; retry < 3; retry++) {
ret = i2c_init_transfer_(i2c_bus, chip, addr, alen);
if (ret >= 0)
return 0;
i2c_imx_stop(i2c_bus);
if (ret == -EREMOTEIO)
return ret;
printf("%s: failed for chip 0x%x retry=%d\n", __func__, chip,
retry);
if (ret != -ERESTART)
/* Disable controller */
writeb(I2CR_IDIS, i2c_bus->base + (I2CR << reg_shift));
udelay(100);
if (i2c_idle_bus(i2c_bus) < 0)
break;
}
printf("%s: give up i2c_regs=0x%lx\n", __func__, i2c_bus->base);
return ret;
}
static int i2c_write_data(struct mxc_i2c_bus *i2c_bus, u8 chip, const u8 *buf,
int len)
{
int i, ret = 0;
debug("i2c_write_data: chip=0x%x, len=0x%x\n", chip, len);
debug("write_data: ");
/* use rc for counter */
for (i = 0; i < len; ++i)
debug(" 0x%02x", buf[i]);
debug("\n");
for (i = 0; i < len; i++) {
ret = tx_byte(i2c_bus, buf[i]);
if (ret < 0) {
debug("i2c_write_data(): rc=%d\n", ret);
break;
}
}
return ret;
}
/* Will generate a STOP after the last byte if "last" is true, i.e. this is the
* final message of a transaction. If not, it switches the bus back to TX mode
* and does not send a STOP, leaving the bus in a state where a repeated start
* and address can be sent for another message.
*/
static int i2c_read_data(struct mxc_i2c_bus *i2c_bus, uchar chip, uchar *buf,
int len, bool last)
{
int ret;
unsigned int temp;
int i;
int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ?
VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
ulong base = i2c_bus->base;
debug("i2c_read_data: chip=0x%x, len=0x%x\n", chip, len);
/* setup bus to read data */
temp = readb(base + (I2CR << reg_shift));
temp &= ~(I2CR_MTX | I2CR_TX_NO_AK);
if (len == 1)
temp |= I2CR_TX_NO_AK;
writeb(temp, base + (I2CR << reg_shift));
writeb(I2SR_IIF_CLEAR, base + (I2SR << reg_shift));
/* dummy read to clear ICF */
readb(base + (I2DR << reg_shift));
/* read data */
for (i = 0; i < len; i++) {
ret = wait_for_sr_state(i2c_bus, ST_IIF);
if (ret < 0) {
debug("i2c_read_data(): ret=%d\n", ret);
i2c_imx_stop(i2c_bus);
return ret;
}
if (i == (len - 1)) {
/* Final byte has already been received by master! When
* we read it from I2DR, the master will start another
* cycle. We must program it first to send a STOP or
* switch to TX to avoid this.
*/
if (last) {
i2c_imx_stop(i2c_bus);
} else {
/* Final read, no stop, switch back to tx */
temp = readb(base + (I2CR << reg_shift));
temp |= I2CR_MTX | I2CR_TX_NO_AK;
writeb(temp, base + (I2CR << reg_shift));
}
} else if (i == (len - 2)) {
/* Master has already recevied penultimate byte. When
* we read it from I2DR, master will start RX of final
* byte. We must set TX_NO_AK now so it does not ACK
* that final byte.
*/
temp = readb(base + (I2CR << reg_shift));
temp |= I2CR_TX_NO_AK;
writeb(temp, base + (I2CR << reg_shift));
}
writeb(I2SR_IIF_CLEAR, base + (I2SR << reg_shift));
buf[i] = readb(base + (I2DR << reg_shift));
}
/* reuse ret for counter*/
for (ret = 0; ret < len; ++ret)
debug(" 0x%02x", buf[ret]);
debug("\n");
/* It is not clear to me that this is necessary */
if (last)
i2c_imx_stop(i2c_bus);
return 0;
}
int __enable_i2c_clk(unsigned char enable, unsigned int i2c_num)
{
return 1;
}
int enable_i2c_clk(unsigned char enable, unsigned int i2c_num)
__attribute__((weak, alias("__enable_i2c_clk")));
#if !CONFIG_IS_ENABLED(DM_I2C)
/*
* Read data from I2C device
*
* The transactions use the syntax defined in the Linux kernel I2C docs.
*
* If alen is > 0, then this function will send a transaction of the form:
* S Chip Wr [A] Addr [A] S Chip Rd [A] [data] A ... NA P
* This is a normal I2C register read: writing the register address, then doing
* a repeated start and reading the data.
*
* If alen == 0, then we get this transaction:
* S Chip Wr [A] S Chip Rd [A] [data] A ... NA P
* This is somewhat unusual, though valid, transaction. It addresses the chip
* in write mode, but doesn't actually write any register address or data, then
* does a repeated start and reads data.
*
* If alen < 0, then we get this transaction:
* S Chip Rd [A] [data] A ... NA P
* The chip is addressed in read mode and then data is read. No register
* address is written first. This is perfectly valid on most devices and
* required on some (usually those that don't act like an array of registers).
*/
static int bus_i2c_read(struct mxc_i2c_bus *i2c_bus, u8 chip, u32 addr,
int alen, u8 *buf, int len)
{
int ret = 0;
u32 temp;
int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ?
VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
ulong base = i2c_bus->base;
ret = i2c_init_transfer(i2c_bus, chip, addr, alen);
if (ret < 0)
return ret;
if (alen >= 0) {
temp = readb(base + (I2CR << reg_shift));
temp |= I2CR_RSTA;
writeb(temp, base + (I2CR << reg_shift));
}
ret = tx_byte(i2c_bus, (chip << 1) | 1);
if (ret < 0) {
i2c_imx_stop(i2c_bus);
return ret;
}
ret = i2c_read_data(i2c_bus, chip, buf, len, true);
i2c_imx_stop(i2c_bus);
return ret;
}
/*
* Write data to I2C device
*
* If alen > 0, we get this transaction:
* S Chip Wr [A] addr [A] data [A] ... [A] P
* An ordinary write register command.
*
* If alen == 0, then we get this:
* S Chip Wr [A] data [A] ... [A] P
* This is a simple I2C write.
*
* If alen < 0, then we get this:
* S data [A] ... [A] P
* This is most likely NOT something that should be used. It doesn't send the
* chip address first, so in effect, the first byte of data will be used as the
* address.
*/
static int bus_i2c_write(struct mxc_i2c_bus *i2c_bus, u8 chip, u32 addr,
int alen, const u8 *buf, int len)
{
int ret = 0;
ret = i2c_init_transfer(i2c_bus, chip, addr, alen);
if (ret < 0)
return ret;
ret = i2c_write_data(i2c_bus, chip, buf, len);
i2c_imx_stop(i2c_bus);
return ret;
}
struct mxc_i2c_bus *i2c_get_base(struct i2c_adapter *adap)
{
return &mxc_i2c_buses[adap->hwadapnr];
}
static int mxc_i2c_read(struct i2c_adapter *adap, uint8_t chip,
uint addr, int alen, uint8_t *buffer,
int len)
{
return bus_i2c_read(i2c_get_base(adap), chip, addr, alen, buffer, len);
}
static int mxc_i2c_write(struct i2c_adapter *adap, uint8_t chip,
uint addr, int alen, uint8_t *buffer,
int len)
{
return bus_i2c_write(i2c_get_base(adap), chip, addr, alen, buffer, len);
}
/*
* Test if a chip at a given address responds (probe the chip)
*/
static int mxc_i2c_probe(struct i2c_adapter *adap, uint8_t chip)
{
return bus_i2c_write(i2c_get_base(adap), chip, 0, 0, NULL, 0);
}
void bus_i2c_init(int index, int speed, int unused,
int (*idle_bus_fn)(void *p), void *idle_bus_data)
{
int ret;
if (index >= ARRAY_SIZE(mxc_i2c_buses)) {
debug("Error i2c index\n");
return;
}
if (IS_ENABLED(CONFIG_IMX_MODULE_FUSE)) {
if (i2c_fused((ulong)mxc_i2c_buses[index].base)) {
printf("SoC fuse indicates I2C@0x%lx is unavailable.\n",
(ulong)mxc_i2c_buses[index].base);
return;
}
}
/*
* Warning: Be careful to allow the assignment to a static
* variable here. This function could be called while U-Boot is
* still running in flash memory. So such assignment is equal
* to write data to flash without erasing.
*/
if (idle_bus_fn)
mxc_i2c_buses[index].idle_bus_fn = idle_bus_fn;
if (idle_bus_data)
mxc_i2c_buses[index].idle_bus_data = idle_bus_data;
ret = enable_i2c_clk(1, index);
if (ret < 0) {
debug("I2C-%d clk fail to enable.\n", index);
return;
}
bus_i2c_set_bus_speed(&mxc_i2c_buses[index], speed);
}
/*
* Init I2C Bus
*/
static void mxc_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr)
{
bus_i2c_init(adap->hwadapnr, speed, slaveaddr, NULL, NULL);
}
/*
* Set I2C Speed
*/
static u32 mxc_i2c_set_bus_speed(struct i2c_adapter *adap, uint speed)
{
return bus_i2c_set_bus_speed(i2c_get_base(adap), speed);
}
/*
* Register mxc i2c adapters
*/
#ifdef CONFIG_SYS_I2C_MXC_I2C1
U_BOOT_I2C_ADAP_COMPLETE(mxc0, mxc_i2c_init, mxc_i2c_probe,
mxc_i2c_read, mxc_i2c_write,
mxc_i2c_set_bus_speed,
CONFIG_SYS_MXC_I2C1_SPEED,
CONFIG_SYS_MXC_I2C1_SLAVE, 0)
#endif
#ifdef CONFIG_SYS_I2C_MXC_I2C2
U_BOOT_I2C_ADAP_COMPLETE(mxc1, mxc_i2c_init, mxc_i2c_probe,
mxc_i2c_read, mxc_i2c_write,
mxc_i2c_set_bus_speed,
CONFIG_SYS_MXC_I2C2_SPEED,
CONFIG_SYS_MXC_I2C2_SLAVE, 1)
#endif
#ifdef CONFIG_SYS_I2C_MXC_I2C3
U_BOOT_I2C_ADAP_COMPLETE(mxc2, mxc_i2c_init, mxc_i2c_probe,
mxc_i2c_read, mxc_i2c_write,
mxc_i2c_set_bus_speed,
CONFIG_SYS_MXC_I2C3_SPEED,
CONFIG_SYS_MXC_I2C3_SLAVE, 2)
#endif
#ifdef CONFIG_SYS_I2C_MXC_I2C4
U_BOOT_I2C_ADAP_COMPLETE(mxc3, mxc_i2c_init, mxc_i2c_probe,
mxc_i2c_read, mxc_i2c_write,
mxc_i2c_set_bus_speed,
CONFIG_SYS_MXC_I2C4_SPEED,
CONFIG_SYS_MXC_I2C4_SLAVE, 3)
#endif
#ifdef CONFIG_SYS_I2C_MXC_I2C5
U_BOOT_I2C_ADAP_COMPLETE(mxc4, mxc_i2c_init, mxc_i2c_probe,
mxc_i2c_read, mxc_i2c_write,
mxc_i2c_set_bus_speed,
CONFIG_SYS_MXC_I2C5_SPEED,
CONFIG_SYS_MXC_I2C5_SLAVE, 4)
#endif
#ifdef CONFIG_SYS_I2C_MXC_I2C6
U_BOOT_I2C_ADAP_COMPLETE(mxc5, mxc_i2c_init, mxc_i2c_probe,
mxc_i2c_read, mxc_i2c_write,
mxc_i2c_set_bus_speed,
CONFIG_SYS_MXC_I2C6_SPEED,
CONFIG_SYS_MXC_I2C6_SLAVE, 5)
#endif
#ifdef CONFIG_SYS_I2C_MXC_I2C7
U_BOOT_I2C_ADAP_COMPLETE(mxc6, mxc_i2c_init, mxc_i2c_probe,
mxc_i2c_read, mxc_i2c_write,
mxc_i2c_set_bus_speed,
CONFIG_SYS_MXC_I2C7_SPEED,
CONFIG_SYS_MXC_I2C7_SLAVE, 6)
#endif
#ifdef CONFIG_SYS_I2C_MXC_I2C8
U_BOOT_I2C_ADAP_COMPLETE(mxc7, mxc_i2c_init, mxc_i2c_probe,
mxc_i2c_read, mxc_i2c_write,
mxc_i2c_set_bus_speed,
CONFIG_SYS_MXC_I2C8_SPEED,
CONFIG_SYS_MXC_I2C8_SLAVE, 7)
#endif
#else
static int mxc_i2c_set_bus_speed(struct udevice *bus, unsigned int speed)
{
struct mxc_i2c_bus *i2c_bus = dev_get_priv(bus);
return bus_i2c_set_bus_speed(i2c_bus, speed);
}
static int mxc_i2c_probe(struct udevice *bus)
{
struct mxc_i2c_bus *i2c_bus = dev_get_priv(bus);
const void *fdt = gd->fdt_blob;
int node = dev_of_offset(bus);
fdt_addr_t addr;
int ret, ret2;
i2c_bus->driver_data = dev_get_driver_data(bus);
addr = dev_read_addr(bus);
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
if (IS_ENABLED(CONFIG_IMX_MODULE_FUSE)) {
if (i2c_fused((ulong)addr)) {
printf("SoC fuse indicates I2C@0x%lx is unavailable.\n",
(ulong)addr);
return -ENODEV;
}
}
i2c_bus->base = addr;
i2c_bus->index = dev_seq(bus);
i2c_bus->bus = bus;
/* Enable clk */
#if CONFIG_IS_ENABLED(CLK)
ret = clk_get_by_index(bus, 0, &i2c_bus->per_clk);
if (ret) {
printf("Failed to get i2c clk\n");
return ret;
}
ret = clk_enable(&i2c_bus->per_clk);
if (ret) {
printf("Failed to enable i2c clk\n");
return ret;
}
#else
ret = enable_i2c_clk(1, dev_seq(bus));
if (ret < 0)
return ret;
#endif
/*
* See Documentation/devicetree/bindings/i2c/i2c-imx.txt
* Use gpio to force bus idle when necessary.
*/
ret = fdt_stringlist_search(fdt, node, "pinctrl-names", "gpio");
if (ret < 0) {
debug("i2c bus %d at 0x%2lx, no gpio pinctrl state.\n",
dev_seq(bus), i2c_bus->base);
} else {
ret = gpio_request_by_name_nodev(offset_to_ofnode(node),
"scl-gpios", 0, &i2c_bus->scl_gpio,
GPIOD_IS_OUT);
ret2 = gpio_request_by_name_nodev(offset_to_ofnode(node),
"sda-gpios", 0, &i2c_bus->sda_gpio,
GPIOD_IS_OUT);
if (!dm_gpio_is_valid(&i2c_bus->sda_gpio) ||
!dm_gpio_is_valid(&i2c_bus->scl_gpio) ||
ret || ret2) {
dev_err(bus,
"i2c bus %d at 0x%2lx, fail to request scl/sda gpio\n",
dev_seq(bus), i2c_bus->base);
return -EINVAL;
}
}
/*
* Pinmux settings are in board file now, until pinmux is supported,
* we can set pinmux here in probe function.
*/
debug("i2c : controller bus %d at 0x%lx , speed %d: ",
dev_seq(bus), i2c_bus->base,
i2c_bus->speed);
return 0;
}
/* Sends: S Addr Wr [A|NA] P */
static int mxc_i2c_probe_chip(struct udevice *bus, u32 chip_addr,
u32 chip_flags)
{
int ret;
struct mxc_i2c_bus *i2c_bus = dev_get_priv(bus);
ret = i2c_init_transfer(i2c_bus, chip_addr, 0, 0);
if (ret < 0) {
debug("%s failed, ret = %d\n", __func__, ret);
return ret;
}
i2c_imx_stop(i2c_bus);
return 0;
}
static int mxc_i2c_xfer(struct udevice *bus, struct i2c_msg *msg, int nmsgs)
{
struct mxc_i2c_bus *i2c_bus = dev_get_priv(bus);
int ret = 0;
ulong base = i2c_bus->base;
int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ?
VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT;
int read_mode;
/* Here address len is set to -1 to not send any address at first.
* Otherwise i2c_init_transfer will send the chip address with write
* mode set. This is wrong if the 1st message is read.
*/
ret = i2c_init_transfer(i2c_bus, msg->addr, 0, -1);
if (ret < 0) {
debug("i2c_init_transfer error: %d\n", ret);
return ret;
}
read_mode = -1; /* So it's always different on the first message */
for (; nmsgs > 0; nmsgs--, msg++) {
const int msg_is_read = !!(msg->flags & I2C_M_RD);
debug("i2c_xfer: chip=0x%x, len=0x%x, dir=%c\n", msg->addr,
msg->len, msg_is_read ? 'R' : 'W');
if (msg_is_read != read_mode) {
/* Send repeated start if not 1st message */
if (read_mode != -1) {
debug("i2c_xfer: [RSTART]\n");
ret = readb(base + (I2CR << reg_shift));
ret |= I2CR_RSTA;
writeb(ret, base + (I2CR << reg_shift));
}
debug("i2c_xfer: [ADDR %02x | %c]\n", msg->addr,
msg_is_read ? 'R' : 'W');
ret = tx_byte(i2c_bus, (msg->addr << 1) | msg_is_read);
if (ret < 0) {
debug("i2c_xfer: [STOP]\n");
i2c_imx_stop(i2c_bus);
break;
}
read_mode = msg_is_read;
}
if (msg->flags & I2C_M_RD)
ret = i2c_read_data(i2c_bus, msg->addr, msg->buf,
msg->len, nmsgs == 1 ||
(msg->flags & I2C_M_STOP));
else
ret = i2c_write_data(i2c_bus, msg->addr, msg->buf,
msg->len);
if (ret < 0)
break;
}
if (ret)
debug("i2c_write: error sending\n");
i2c_imx_stop(i2c_bus);
return ret;
}
static const struct dm_i2c_ops mxc_i2c_ops = {
.xfer = mxc_i2c_xfer,
.probe_chip = mxc_i2c_probe_chip,
.set_bus_speed = mxc_i2c_set_bus_speed,
};
static const struct udevice_id mxc_i2c_ids[] = {
{ .compatible = "fsl,imx21-i2c", },
{ .compatible = "fsl,vf610-i2c", .data = I2C_QUIRK_FLAG, },
{}
};
U_BOOT_DRIVER(i2c_mxc) = {
.name = "i2c_mxc",
.id = UCLASS_I2C,
.of_match = mxc_i2c_ids,
.probe = mxc_i2c_probe,
.priv_auto = sizeof(struct mxc_i2c_bus),
.ops = &mxc_i2c_ops,
.flags = DM_FLAG_PRE_RELOC,
};
#endif
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