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, but pinctrl is not included. 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_bus_idle. Since bus_i2c_init is not good for DM I2C and pinctrl is missed, we use a weak function for i2c_idle_bus. 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_bus_idle(i2c_pads_info0); else if (i2c_bus->index == 1) force_bus_idle(i2c_pads_info1); else xxxxxx } " 8. Introduce a weak function, enable_i2c_clk 9. Tested on an i.MX7 platform. Log info: => dm tree Class Probed Name ---------------------------------------- root [ + ] root_driver simple_bus [ ] |-- soc simple_bus [ ] | |-- aips-bus@30000000 simple_bus [ ] | | |-- anatop@30360000 simple_bus [ ] | | `-- snvs@30370000 simple_bus [ ] | |-- aips-bus@30400000 simple_bus [ ] | `-- aips-bus@30800000 i2c [ ] | |-- i2c@30a20000 i2c [ ] | `-- i2c@30a40000 simple_bus [ ] `-- regulators => i2c dev 0 Setting bus to 0 => i2c probe Valid chip addresses: 08 50 => i2c md 8 31 0031: 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08
Signed-off-by: Peng Fan Peng.Fan@freescale.com Acked-by: Simon Glass sjg@chromium.org ---
Changes v4: 1. fix build errors 2. Introduce a weak function enable_i2c_clk. 3. add Simon's Acked-by. 4. Add test log in commit log.
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 | 581 ++++++++++++++++++++---------- 3 files changed, 433 insertions(+), 193 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 42782cb..81adf6f 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 @@ -131,11 +126,10 @@ static u16 i2c_clk_div[50][2] = { #define CONFIG_SYS_MXC_I2C4_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; @@ -168,18 +162,20 @@ 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; }
@@ -187,21 +183,26 @@ 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) @@ -212,17 +213,21 @@ 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) @@ -231,16 +236,28 @@ 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__); } @@ -249,66 +266,96 @@ 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; +}
-static int i2c_init_transfer(struct mxc_i2c_regs *i2c_regs, - uchar chip, uint addr, int alen) +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_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;
@@ -316,54 +363,67 @@ 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; - - ret = i2c_init_transfer(i2c_regs, chip, addr, alen); - if (ret < 0) - return ret; + int reg_shift = i2c_bus->driver_data & I2C_QUIRK_FLAG ? + VF610_I2C_REGSHIFT : IMX_I2C_REGSHIFT; + ulong base = i2c_bus->base;
- 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; }
@@ -372,105 +432,111 @@ 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 + 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 defined(CONFIG_VF610) - (void *)I2C0_BASE_ADDR + { 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) -{ - 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 mxc_i2c_bus *i2c_get_base(struct i2c_adapter *adap) { - 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, @@ -495,29 +561,33 @@ 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) +int __enable_i2c_clk(unsigned char enable, unsigned i2c_num) +{ + return 1; +} +int enable_i2c_clk(unsigned char enable, unsigned i2c_num) + __attribute__((weak, alias("__enable_i2c_clk"))); + +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; + } + + bus_i2c_set_bus_speed(&mxc_i2c_buses[index], speed); }
/* @@ -525,13 +595,13 @@ 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); } @@ -556,6 +626,7 @@ U_BOOT_I2C_ADAP_COMPLETE(mxc2, mxc_i2c_init, mxc_i2c_probe, 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, @@ -563,3 +634,143 @@ U_BOOT_I2C_ADAP_COMPLETE(mxc3, mxc_i2c_init, mxc_i2c_probe, CONFIG_SYS_MXC_I2C4_SPEED, CONFIG_SYS_MXC_I2C4_SLAVE, 3) #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