[U-Boot] [PATCH V3] i2c: mxc: refactor i2c driver and support dm
Peng Fan
Peng.Fan at freescale.com
Mon Apr 27 15:36:00 CEST 2015
1. Introduce a new structure `struct mxc_i2c_bus`, this structure will
used for non-DM and DM.
2. Remove `struct mxc_i2c_regs` structure, but use register offset to access
registers based on `base` entry of `struct mxc_i2c_bus`.
3. Remove most `#ifdef I2C_QUIRK_REG`. Using driver_data to contain platform
flags. A new flag is introduced, I2C_QUIRK_FLAG.
4. Most functions use `struct mxc_i2c_bus` as one of the parameters.
Make most functions common to DM and non-DM, try to avoid duplicated code.
5. Support DM. Pinmux setting is still set by setup_i2c, but we do not
need bus_i2c_init for DM.
6. struct i2c_parms and struct sram_data are removed.
7. Remove bus_i2c_read bus_i2c_write prototype in header file. The frist
paramter of bus_i2c_init is modified to i2c index. Add new prototype
i2c_idle_bus and force_idle_bus. Since bus_i2c_init is not good for
DM I2C and pinctrl is missed, we use a weak function for i2c_idle_bus
for DM part.
Board file take the responsibility to implement this function, like this:
"
int i2c_idle_bus(struct mxc_i2c_bus *i2c_bus)
{
if (i2c_bus->index == 0)
force_idle_bus(i2c_pads_info0);
else if (i2c_bus->index == 1)
force_idle_bus(i2c_pads_info1);
else
xxxxxx
}
"
Signed-off-by: Peng Fan <Peng.Fan at freescale.com>
---
Changes v3:
1. remove bus_i2c_init for DM, introuduce a weak function i2c_idle_bus.
2. remove static return type for force_idle_bus, since we need to call
it in i2c_idle_bus which may be implemented in board file. This does
not hurt for non-DM.
Changes v2:
1. Refactor driver, remove register access based on structure, but use
'base + offset'
2. Introduce mxc_i2c_bus structure
3. Introduce I2C_QUIRK_FLAG and remove most I2C_QUIRK_REG and use
driver_data to contain the flags for different platforms
4. Avoid duplicated code between DM and non-DM part
5. The function name i2c_init_transfer is not changed.
6. Remove bus_i2c_read/write prototype from header file
7. change bus_i2c_init's first parameter to i2c index
8. Rename patch name, since refactor non-DM part.
arch/arm/imx-common/i2c-mxv7.c | 7 +-
arch/arm/include/asm/imx-common/mxc_i2c.h | 38 +-
drivers/i2c/mxc_i2c.c | 575 ++++++++++++++++++++----------
3 files changed, 426 insertions(+), 194 deletions(-)
diff --git a/arch/arm/imx-common/i2c-mxv7.c b/arch/arm/imx-common/i2c-mxv7.c
index 1a632e7..f3a5c3f 100644
--- a/arch/arm/imx-common/i2c-mxv7.c
+++ b/arch/arm/imx-common/i2c-mxv7.c
@@ -12,7 +12,7 @@
#include <asm/imx-common/mxc_i2c.h>
#include <watchdog.h>
-static int force_idle_bus(void *priv)
+int force_idle_bus(void *priv)
{
int i;
int sda, scl;
@@ -99,8 +99,9 @@ int setup_i2c(unsigned i2c_index, int speed, int slave_addr,
if (ret)
goto err_idle;
- bus_i2c_init(i2c_bases[i2c_index], speed, slave_addr,
- force_idle_bus, p);
+#ifndef CONFIG_DM_I2C
+ bus_i2c_init(i2c_index, speed, slave_addr, force_idle_bus, p);
+#endif
return 0;
diff --git a/arch/arm/include/asm/imx-common/mxc_i2c.h b/arch/arm/include/asm/imx-common/mxc_i2c.h
index af86163..355b25e 100644
--- a/arch/arm/include/asm/imx-common/mxc_i2c.h
+++ b/arch/arm/include/asm/imx-common/mxc_i2c.h
@@ -19,6 +19,36 @@ struct i2c_pads_info {
struct i2c_pin_ctrl sda;
};
+/*
+ * Information about i2c controller
+ * struct mxc_i2c_bus - information about the i2c[x] bus
+ * @index: i2c bus index
+ * @base: Address of I2C bus controller
+ * @driver_data: Flags for different platforms, such as I2C_QUIRK_FLAG.
+ * @speed: Speed of I2C bus
+ * @pads_info: pinctrl info for this i2c bus, will be used when pinctrl is ok.
+ * The following two is only to be compatible with non-DM part.
+ * @idle_bus_fn: function to force bus idle
+ * @idle_bus_data: parameter for idle_bus_fun
+ */
+struct mxc_i2c_bus {
+ /*
+ * board file can use this index to locate which i2c_pads_info is for
+ * i2c_idle_bus. When pinmux is implement, this entry can be
+ * discarded. Here we do not use dev->seq, because we do not want to
+ * export device to board file.
+ */
+ int index;
+ ulong base;
+ ulong driver_data;
+ int speed;
+ struct i2c_pads_info *pads_info;
+#ifndef CONFIG_DM_I2C
+ int (*idle_bus_fn)(void *p);
+ void *idle_bus_data;
+#endif
+};
+
#if defined(CONFIG_MX6QDL)
#define I2C_PADS(name, scl_i2c, scl_gpio, scl_gp, sda_i2c, sda_gpio, sda_gp) \
struct i2c_pads_info mx6q_##name = { \
@@ -54,10 +84,8 @@ struct i2c_pads_info {
int setup_i2c(unsigned i2c_index, int speed, int slave_addr,
struct i2c_pads_info *p);
-void bus_i2c_init(void *base, int speed, int slave_addr,
+void bus_i2c_init(int index, int speed, int slave_addr,
int (*idle_bus_fn)(void *p), void *p);
-int bus_i2c_read(void *base, uchar chip, uint addr, int alen, uchar *buf,
- int len);
-int bus_i2c_write(void *base, uchar chip, uint addr, int alen,
- const uchar *buf, int len);
+int force_idle_bus(void *priv);
+int i2c_idle_bus(struct mxc_i2c_bus *i2c_bus);
#endif
diff --git a/drivers/i2c/mxc_i2c.c b/drivers/i2c/mxc_i2c.c
index fc5ee35..02483b0 100644
--- a/drivers/i2c/mxc_i2c.c
+++ b/drivers/i2c/mxc_i2c.c
@@ -18,29 +18,25 @@
#include <asm/arch/clock.h>
#include <asm/arch/imx-regs.h>
#include <asm/errno.h>
+#include <asm/imx-common/mxc_i2c.h>
#include <asm/io.h>
#include <i2c.h>
#include <watchdog.h>
+#include <dm.h>
+#include <fdtdec.h>
DECLARE_GLOBAL_DATA_PTR;
-#ifdef I2C_QUIRK_REG
-struct mxc_i2c_regs {
- uint8_t iadr;
- uint8_t ifdr;
- uint8_t i2cr;
- uint8_t i2sr;
- uint8_t i2dr;
-};
-#else
-struct mxc_i2c_regs {
- uint32_t iadr;
- uint32_t ifdr;
- uint32_t i2cr;
- uint32_t i2sr;
- uint32_t i2dr;
-};
-#endif
+#define I2C_QUIRK_FLAG (1 << 0)
+
+#define IMX_I2C_REGSHIFT 2
+#define VF610_I2C_REGSHIFT 0
+/* 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)
@@ -104,7 +100,6 @@ static u16 i2c_clk_div[50][2] = {
};
#endif
-
#ifndef CONFIG_SYS_MXC_I2C1_SPEED
#define CONFIG_SYS_MXC_I2C1_SPEED 100000
#endif
@@ -125,11 +120,10 @@ static u16 i2c_clk_div[50][2] = {
#define CONFIG_SYS_MXC_I2C3_SLAVE 0
#endif
-
/*
* Calculate and set proper clock divider
*/
-static uint8_t i2c_imx_get_clk(unsigned int rate)
+static uint8_t i2c_imx_get_clk(struct mxc_i2c_bus *i2c_bus, unsigned int rate)
{
unsigned int i2c_clk_rate;
unsigned int div;
@@ -162,18 +156,20 @@ static uint8_t i2c_imx_get_clk(unsigned int rate)
/*
* Set I2C Bus speed
*/
-static int bus_i2c_set_bus_speed(void *base, int speed)
+static int bus_i2c_set_bus_speed(struct mxc_i2c_bus *i2c_bus, int speed)
{
- struct mxc_i2c_regs *i2c_regs = (struct mxc_i2c_regs *)base;
- u8 clk_idx = i2c_imx_get_clk(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;
/* Store divider value */
- writeb(idx, &i2c_regs->ifdr);
+ writeb(idx, base + (IFDR << reg_shift));
/* Reset module */
- writeb(I2CR_IDIS, &i2c_regs->i2cr);
- writeb(0, &i2c_regs->i2sr);
+ writeb(I2CR_IDIS, base + (I2CR << reg_shift));
+ writeb(0, base + (I2SR << reg_shift));
return 0;
}
@@ -181,21 +177,26 @@ static int bus_i2c_set_bus_speed(void *base, int speed)
#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_regs *i2c_regs, unsigned state)
+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(&i2c_regs->i2sr);
+ sr = readb(base + (I2SR << reg_shift));
if (sr & I2SR_IAL) {
-#ifdef I2C_QUIRK_REG
- writeb(sr | I2SR_IAL, &i2c_regs->i2sr);
-#else
- writeb(sr & ~I2SR_IAL, &i2c_regs->i2sr);
-#endif
+ 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(&i2c_regs->i2cr), state);
+ __func__, sr, readb(base + (I2CR << reg_shift)),
+ state);
return -ERESTART;
}
if ((sr & (state >> 8)) == (unsigned char)state)
@@ -206,17 +207,21 @@ static int wait_for_sr_state(struct mxc_i2c_regs *i2c_regs, unsigned state)
break;
}
printf("%s: failed sr=%x cr=%x state=%x\n", __func__,
- sr, readb(&i2c_regs->i2cr), state);
+ sr, readb(base + (I2CR << reg_shift)), state);
return -ETIMEDOUT;
}
-static int tx_byte(struct mxc_i2c_regs *i2c_regs, u8 byte)
+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, &i2c_regs->i2sr);
- writeb(byte, &i2c_regs->i2dr);
- ret = wait_for_sr_state(i2c_regs, ST_IIF);
+ 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)
@@ -225,16 +230,28 @@ static int tx_byte(struct mxc_i2c_regs *i2c_regs, u8 byte)
}
/*
+ * 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_regs *i2c_regs)
+static void i2c_imx_stop(struct mxc_i2c_bus *i2c_bus)
{
int ret;
- unsigned int temp = readb(&i2c_regs->i2cr);
+ 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, &i2c_regs->i2cr);
- ret = wait_for_sr_state(i2c_regs, ST_BUS_IDLE);
+ 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__);
}
@@ -243,66 +260,96 @@ static void i2c_imx_stop(struct mxc_i2c_regs *i2c_regs)
* Send start signal, chip address and
* write register address
*/
-static int i2c_init_transfer_(struct mxc_i2c_regs *i2c_regs,
- uchar chip, uint addr, int alen)
+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 */
-#ifdef I2C_QUIRK_REG
- if (readb(&i2c_regs->i2cr) & I2CR_IDIS) {
-#else
- if (!(readb(&i2c_regs->i2cr) & I2CR_IEN)) {
-#endif
- writeb(I2CR_IEN, &i2c_regs->i2cr);
+ 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(&i2c_regs->iadr) == (chip << 1))
- writeb((chip << 1) ^ 2, &i2c_regs->iadr);
- writeb(I2SR_IIF_CLEAR, &i2c_regs->i2sr);
- ret = wait_for_sr_state(i2c_regs, ST_BUS_IDLE);
+
+ 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(&i2c_regs->i2cr);
+ temp = readb(base + (I2CR << reg_shift));
temp |= I2CR_MSTA;
- writeb(temp, &i2c_regs->i2cr);
+ writeb(temp, base + (I2CR << reg_shift));
- ret = wait_for_sr_state(i2c_regs, ST_BUS_BUSY);
+ ret = wait_for_sr_state(i2c_bus, ST_BUS_BUSY);
if (ret < 0)
return ret;
temp |= I2CR_MTX | I2CR_TX_NO_AK;
- writeb(temp, &i2c_regs->i2cr);
+ writeb(temp, base + (I2CR << reg_shift));
/* write slave address */
- ret = tx_byte(i2c_regs, chip << 1);
+ ret = tx_byte(i2c_bus, chip << 1);
if (ret < 0)
return ret;
while (alen--) {
- ret = tx_byte(i2c_regs, (addr >> (alen * 8)) & 0xff);
+ ret = tx_byte(i2c_bus, (addr >> (alen * 8)) & 0xff);
if (ret < 0)
return ret;
}
return 0;
}
-static int i2c_idle_bus(void *base);
+#ifndef CONFIG_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
+/*
+ * Since pinmux is not supported, implement a weak function here.
+ * You can implement your i2c_bus_idle in board file. When pinctrl
+ * is supported, this can be removed.
+ */
+int __i2c_idle_bus(struct mxc_i2c_bus *i2c_bus)
+{
+ return 0;
+}
+
+int i2c_idle_bus(struct mxc_i2c_bus *i2c_bus)
+ __attribute__((weak, alias("__i2c_idle_bus")));
+#endif
-static int i2c_init_transfer(struct mxc_i2c_regs *i2c_regs,
- uchar chip, uint addr, int alen)
+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;
for (retry = 0; retry < 3; retry++) {
- ret = i2c_init_transfer_(i2c_regs, chip, addr, alen);
+ ret = i2c_init_transfer_(i2c_bus, chip, addr, alen);
if (ret >= 0)
return 0;
- i2c_imx_stop(i2c_regs);
+ i2c_imx_stop(i2c_bus);
if (ret == -ENODEV)
return ret;
@@ -310,54 +357,67 @@ static int i2c_init_transfer(struct mxc_i2c_regs *i2c_regs,
retry);
if (ret != -ERESTART)
/* Disable controller */
- writeb(I2CR_IDIS, &i2c_regs->i2cr);
+ writeb(I2CR_IDIS, i2c_bus->base + (I2CR << reg_shift));
udelay(100);
- if (i2c_idle_bus(i2c_regs) < 0)
+ if (i2c_idle_bus(i2c_bus) < 0)
break;
}
- printf("%s: give up i2c_regs=%p\n", __func__, i2c_regs);
+ printf("%s: give up i2c_regs=0x%lx\n", __func__, i2c_bus->base);
return ret;
}
-/*
- * Read data from I2C device
- */
-int bus_i2c_read(void *base, uchar chip, uint addr, int alen, uchar *buf,
- int len)
+
+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;
+}
+
+static int i2c_read_data(struct mxc_i2c_bus *i2c_bus, uchar chip, uchar *buf,
+ int len)
{
int ret;
unsigned int temp;
int i;
- struct mxc_i2c_regs *i2c_regs = (struct mxc_i2c_regs *)base;
+ 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_regs, chip, addr, alen);
- if (ret < 0)
- return ret;
-
- temp = readb(&i2c_regs->i2cr);
- temp |= I2CR_RSTA;
- writeb(temp, &i2c_regs->i2cr);
-
- ret = tx_byte(i2c_regs, (chip << 1) | 1);
- if (ret < 0) {
- i2c_imx_stop(i2c_regs);
- return ret;
- }
+ debug("i2c_read_data: chip=0x%x, len=0x%x\n", chip, len);
/* setup bus to read data */
- temp = readb(&i2c_regs->i2cr);
+ temp = readb(base + (I2CR << reg_shift));
temp &= ~(I2CR_MTX | I2CR_TX_NO_AK);
if (len == 1)
temp |= I2CR_TX_NO_AK;
- writeb(temp, &i2c_regs->i2cr);
- writeb(I2SR_IIF_CLEAR, &i2c_regs->i2sr);
- readb(&i2c_regs->i2dr); /* dummy read to clear ICF */
+ 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_regs, ST_IIF);
+ ret = wait_for_sr_state(i2c_bus, ST_IIF);
if (ret < 0) {
- i2c_imx_stop(i2c_regs);
+ debug("i2c_read_data(): ret=%d\n", ret);
+ i2c_imx_stop(i2c_bus);
return ret;
}
@@ -366,105 +426,111 @@ int bus_i2c_read(void *base, uchar chip, uint addr, int alen, uchar *buf,
* controller from generating another clock cycle
*/
if (i == (len - 1)) {
- i2c_imx_stop(i2c_regs);
+ i2c_imx_stop(i2c_bus);
} else if (i == (len - 2)) {
- temp = readb(&i2c_regs->i2cr);
+ temp = readb(base + (I2CR << reg_shift));
temp |= I2CR_TX_NO_AK;
- writeb(temp, &i2c_regs->i2cr);
+ writeb(temp, base + (I2CR << reg_shift));
}
- writeb(I2SR_IIF_CLEAR, &i2c_regs->i2sr);
- buf[i] = readb(&i2c_regs->i2dr);
+ writeb(I2SR_IIF_CLEAR, base + (I2SR << reg_shift));
+ buf[i] = readb(base + (I2DR << reg_shift));
}
- i2c_imx_stop(i2c_regs);
+
+ /* reuse ret for counter*/
+ for (ret = 0; ret < len; ++ret)
+ debug(" 0x%02x", buf[ret]);
+ debug("\n");
+
+ i2c_imx_stop(i2c_bus);
return 0;
}
+#ifndef CONFIG_DM_I2C
/*
- * Write data to I2C device
+ * Read data from I2C device
*/
-int bus_i2c_write(void *base, uchar chip, uint addr, int alen,
- const uchar *buf, int len)
+static int bus_i2c_read(struct mxc_i2c_bus *i2c_bus, u8 chip, u32 addr,
+ int alen, u8 *buf, int len)
{
- int ret;
- int i;
- struct mxc_i2c_regs *i2c_regs = (struct mxc_i2c_regs *)base;
+ 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_regs, chip, addr, alen);
+ ret = i2c_init_transfer(i2c_bus, chip, addr, alen);
if (ret < 0)
return ret;
- for (i = 0; i < len; i++) {
- ret = tx_byte(i2c_regs, buf[i]);
- if (ret < 0)
- break;
+ 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;
}
- i2c_imx_stop(i2c_regs);
+
+ ret = i2c_read_data(i2c_bus, chip, buf, len);
+
+ i2c_imx_stop(i2c_bus);
+ return ret;
+}
+
+/*
+ * Write data to I2C device
+ */
+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;
}
-static void * const i2c_bases[] = {
+static struct mxc_i2c_bus mxc_i2c_buses[] = {
#if defined(CONFIG_MX25)
- (void *)IMX_I2C_BASE,
- (void *)IMX_I2C2_BASE,
- (void *)IMX_I2C3_BASE
+ { 0, IMX_I2C_BASE },
+ { 1, IMX_I2C2_BASE },
+ { 2, IMX_I2C3_BASE },
#elif defined(CONFIG_MX27)
- (void *)IMX_I2C1_BASE,
- (void *)IMX_I2C2_BASE
+ { 0, IMX_I2C1_BASE },
+ { 1, IMX_I2C2_BASE },
#elif defined(CONFIG_MX31) || defined(CONFIG_MX35) || \
defined(CONFIG_MX51) || defined(CONFIG_MX53) || \
- defined(CONFIG_MX6) || defined(CONFIG_LS102XA)
- (void *)I2C1_BASE_ADDR,
- (void *)I2C2_BASE_ADDR,
- (void *)I2C3_BASE_ADDR
-#elif defined(CONFIG_VF610)
- (void *)I2C0_BASE_ADDR
+ defined(CONFIG_MX6)
+ { 0, I2C1_BASE_ADDR },
+ { 1, I2C2_BASE_ADDR },
+ { 2, I2C3_BASE_ADDR },
+#elif defined(CONFIG_LS102XA)
+ { 0, I2C1_BASE_ADDR, I2C_QUIRK_FLAG },
+ { 1, I2C2_BASE_ADDR, I2C_QUIRK_FLAG },
+ { 2, I2C3_BASE_ADDR, I2C_QUIRK_FLAG },
+#elif def ined(CONFIG_VF610)
+ { 0, I2C0_BASE_ADDR, I2C_QUIRK_FLAG },
#elif defined(CONFIG_FSL_LSCH3)
- (void *)I2C1_BASE_ADDR,
- (void *)I2C2_BASE_ADDR,
- (void *)I2C3_BASE_ADDR,
- (void *)I2C4_BASE_ADDR
+ { 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 },
#else
#error "architecture not supported"
#endif
+ { }
};
-struct i2c_parms {
- void *base;
- void *idle_bus_data;
- int (*idle_bus_fn)(void *p);
-};
-
-struct sram_data {
- unsigned curr_i2c_bus;
- struct i2c_parms i2c_data[ARRAY_SIZE(i2c_bases)];
-};
-
-void *i2c_get_base(struct i2c_adapter *adap)
+struct mxc_i2c_bus *i2c_get_base(struct i2c_adapter *adap)
{
- return i2c_bases[adap->hwadapnr];
-}
-
-static struct i2c_parms *i2c_get_parms(void *base)
-{
- struct sram_data *srdata = (void *)gd->srdata;
- int i = 0;
- struct i2c_parms *p = srdata->i2c_data;
- while (i < ARRAY_SIZE(srdata->i2c_data)) {
- if (p->base == base)
- return p;
- p++;
- i++;
- }
- printf("Invalid I2C base: %p\n", base);
- return NULL;
-}
-
-static int i2c_idle_bus(void *base)
-{
- struct i2c_parms *p = i2c_get_parms(base);
- if (p && p->idle_bus_fn)
- return p->idle_bus_fn(p->idle_bus_data);
- return 0;
+ return &mxc_i2c_buses[adap->hwadapnr];
}
static int mxc_i2c_read(struct i2c_adapter *adap, uint8_t chip,
@@ -489,29 +555,26 @@ 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(void *base, int speed, int unused,
- int (*idle_bus_fn)(void *p), void *idle_bus_data)
+void bus_i2c_init(int index, int speed, int unused,
+ int (*idle_bus_fn)(void *p), void *idle_bus_data)
{
- struct sram_data *srdata = (void *)gd->srdata;
- int i = 0;
- struct i2c_parms *p = srdata->i2c_data;
- if (!base)
+ int ret;
+
+ if (index >= ARRAY_SIZE(mxc_i2c_buses)) {
+ debug("Error i2c index\n");
return;
- for (;;) {
- if (!p->base || (p->base == base)) {
- p->base = base;
- if (idle_bus_fn) {
- p->idle_bus_fn = idle_bus_fn;
- p->idle_bus_data = idle_bus_data;
- }
- break;
- }
- p++;
- i++;
- if (i >= ARRAY_SIZE(srdata->i2c_data))
- return;
}
- bus_i2c_set_bus_speed(base, speed);
+
+ mxc_i2c_buses[index].idle_bus_fn = idle_bus_fn;
+ 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 ret
+ }
+
+ bus_i2c_set_bus_speed(&mxc_i2c_buses[index], speed);
}
/*
@@ -519,13 +582,13 @@ void bus_i2c_init(void *base, int speed, int unused,
*/
static void mxc_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr)
{
- bus_i2c_init(i2c_get_base(adap), speed, slaveaddr, NULL, NULL);
+ bus_i2c_init(adap->hwadapnr, speed, slaveaddr, NULL, NULL);
}
/*
* Set I2C Speed
*/
-static uint mxc_i2c_set_bus_speed(struct i2c_adapter *adap, uint 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);
}
@@ -552,3 +615,143 @@ U_BOOT_I2C_ADAP_COMPLETE(mxc2, mxc_i2c_init, mxc_i2c_probe,
CONFIG_SYS_MXC_I2C3_SPEED,
CONFIG_SYS_MXC_I2C3_SLAVE, 2)
#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);
+ fdt_addr_t addr;
+ int ret;
+
+ i2c_bus->driver_data = dev_get_driver_data(bus);
+
+ addr = dev_get_addr(bus);
+ if (addr == FDT_ADDR_T_NONE)
+ return -ENODEV;
+
+ i2c_bus->base = addr;
+ i2c_bus->index = bus->seq;
+
+ /* Enable clk */
+ ret = enable_i2c_clk(1, bus->seq);
+ if (ret < 0)
+ return ret;
+
+ ret = i2c_idle_bus(i2c_bus);
+ if (ret < 0) {
+ /* Disable clk */
+ enable_i2c_clk(0, bus->seq);
+ return ret;
+ }
+
+ /*
+ * 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 %lu , speed %d: ",
+ bus->seq, i2c_bus->base,
+ i2c_bus->speed);
+
+ return 0;
+}
+
+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;
+
+ /*
+ * Here the 3rd parameter addr and the 4th one alen are set to 0,
+ * because here we only want to send out chip address. The register
+ * address is wrapped in msg.
+ */
+ ret = i2c_init_transfer(i2c_bus, msg->addr, 0, 0);
+ if (ret < 0) {
+ debug("i2c_init_transfer error: %d\n", ret);
+ return ret;
+ }
+
+ for (; nmsgs > 0; nmsgs--, msg++) {
+ bool next_is_read = nmsgs > 1 && (msg[1].flags & I2C_M_RD);
+ debug("i2c_xfer: chip=0x%x, len=0x%x\n", msg->addr, msg->len);
+ if (msg->flags & I2C_M_RD)
+ ret = i2c_read_data(i2c_bus, msg->addr, msg->buf,
+ msg->len);
+ else {
+ ret = i2c_write_data(i2c_bus, msg->addr, msg->buf,
+ msg->len);
+ if (ret)
+ break;
+ if (next_is_read) {
+ /* Reuse ret */
+ ret = readb(base + (I2CR << reg_shift));
+ ret |= I2CR_RSTA;
+ writeb(ret, base + (I2CR << reg_shift));
+
+ ret = tx_byte(i2c_bus, (msg->addr << 1) | 1);
+ if (ret < 0) {
+ i2c_imx_stop(i2c_bus);
+ 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_alloc_size = sizeof(struct mxc_i2c_bus),
+ .ops = &mxc_i2c_ops,
+};
+#endif
--
1.8.4
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