diff options
Diffstat (limited to 'drivers/i2c/fsl_i2c.c')
| -rw-r--r-- | drivers/i2c/fsl_i2c.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/drivers/i2c/fsl_i2c.c b/drivers/i2c/fsl_i2c.c index 7d99f48467..b8cc647bd3 100644 --- a/drivers/i2c/fsl_i2c.c +++ b/drivers/i2c/fsl_i2c.c @@ -12,6 +12,8 @@ #include <i2c.h> /* Functional interface */ #include <asm/io.h> #include <asm/fsl_i2c.h> /* HW definitions */ +#include <dm.h> +#include <mapmem.h> /* The maximum number of microseconds we will wait until another master has * released the bus. If not defined in the board header file, then use a @@ -34,6 +36,7 @@ DECLARE_GLOBAL_DATA_PTR; +#ifndef CONFIG_DM_I2C static const struct fsl_i2c_base *i2c_base[4] = { (struct fsl_i2c_base *)(CONFIG_SYS_IMMR + CONFIG_SYS_FSL_I2C_OFFSET), #ifdef CONFIG_SYS_FSL_I2C2_OFFSET @@ -46,6 +49,7 @@ static const struct fsl_i2c_base *i2c_base[4] = { (struct fsl_i2c_base *)(CONFIG_SYS_IMMR + CONFIG_SYS_FSL_I2C4_OFFSET) #endif }; +#endif /* I2C speed map for a DFSR value of 1 */ @@ -192,6 +196,7 @@ static unsigned int set_i2c_bus_speed(const struct fsl_i2c_base *base, return speed; } +#ifndef CONFIG_DM_I2C static unsigned int get_i2c_clock(int bus) { if (bus) @@ -199,6 +204,7 @@ static unsigned int get_i2c_clock(int bus) else return gd->arch.i2c1_clk; /* I2C1 clock */ } +#endif static int fsl_i2c_fixup(const struct fsl_i2c_base *base) { @@ -497,6 +503,7 @@ static unsigned int __i2c_set_bus_speed(const struct fsl_i2c_base *base, return 0; } +#ifndef CONFIG_DM_I2C static void fsl_i2c_init(struct i2c_adapter *adap, int speed, int slaveadd) { __i2c_init(i2c_base[adap->hwadapnr], speed, slaveadd, @@ -559,3 +566,99 @@ U_BOOT_I2C_ADAP_COMPLETE(fsl_3, fsl_i2c_init, fsl_i2c_probe_chip, fsl_i2c_read, CONFIG_SYS_FSL_I2C4_SPEED, CONFIG_SYS_FSL_I2C4_SLAVE, 3) #endif +#else /* CONFIG_DM_I2C */ +static int fsl_i2c_probe_chip(struct udevice *bus, u32 chip_addr, + u32 chip_flags) +{ + struct fsl_i2c_dev *dev = dev_get_priv(bus); + return __i2c_probe_chip(dev->base, chip_addr); +} + +static int fsl_i2c_set_bus_speed(struct udevice *bus, unsigned int speed) +{ + struct fsl_i2c_dev *dev = dev_get_priv(bus); + return __i2c_set_bus_speed(dev->base, speed, dev->i2c_clk); +} + +static int fsl_i2c_ofdata_to_platdata(struct udevice *bus) +{ + struct fsl_i2c_dev *dev = dev_get_priv(bus); + u64 reg; + u32 addr, size; + + reg = fdtdec_get_addr(gd->fdt_blob, bus->of_offset, "reg"); + addr = reg >> 32; + size = reg & 0xFFFFFFFF; + + dev->base = map_sysmem(CONFIG_SYS_IMMR + addr, size); + + if (!dev->base) + return -ENOMEM; + + dev->index = fdtdec_get_int(gd->fdt_blob, bus->of_offset, + "cell-index", -1); + dev->slaveadd = fdtdec_get_int(gd->fdt_blob, bus->of_offset, + "u-boot,i2c-slave-addr", 0x7f); + dev->speed = fdtdec_get_int(gd->fdt_blob, bus->of_offset, + "clock-frequency", 400000); + + dev->i2c_clk = dev->index ? gd->arch.i2c2_clk : gd->arch.i2c1_clk; + + return 0; +} + +static int fsl_i2c_probe(struct udevice *bus) +{ + struct fsl_i2c_dev *dev = dev_get_priv(bus); + __i2c_init(dev->base, dev->speed, dev->slaveadd, dev->i2c_clk, + dev->index); + return 0; +} + +static int fsl_i2c_xfer(struct udevice *bus, struct i2c_msg *msg, int nmsgs) +{ + struct fsl_i2c_dev *dev = dev_get_priv(bus); + struct i2c_msg *dmsg, *omsg, dummy; + + memset(&dummy, 0, sizeof(struct i2c_msg)); + + /* We expect either two messages (one with an offset and one with the + * actucal data) or one message (just data) */ + if (nmsgs > 2 || nmsgs == 0) { + debug("%s: Only one or two messages are supported.", __func__); + return -1; + } + + omsg = nmsgs == 1 ? &dummy : msg; + dmsg = nmsgs == 1 ? msg : msg + 1; + + if (dmsg->flags & I2C_M_RD) + return __i2c_read(dev->base, dmsg->addr, omsg->buf, omsg->len, + dmsg->buf, dmsg->len); + else + return __i2c_write(dev->base, dmsg->addr, omsg->buf, omsg->len, + dmsg->buf, dmsg->len); +} + +static const struct dm_i2c_ops fsl_i2c_ops = { + .xfer = fsl_i2c_xfer, + .probe_chip = fsl_i2c_probe_chip, + .set_bus_speed = fsl_i2c_set_bus_speed, +}; + +static const struct udevice_id fsl_i2c_ids[] = { + { .compatible = "fsl-i2c", }, + { /* sentinel */ } +}; + +U_BOOT_DRIVER(i2c_fsl) = { + .name = "i2c_fsl", + .id = UCLASS_I2C, + .of_match = fsl_i2c_ids, + .probe = fsl_i2c_probe, + .ofdata_to_platdata = fsl_i2c_ofdata_to_platdata, + .priv_auto_alloc_size = sizeof(struct fsl_i2c_dev), + .ops = &fsl_i2c_ops, +}; + +#endif /* CONFIG_DM_I2C */ |