From: Bryan Wu pengw@nvidia.com
clk/reset API was tested on T186 platform and previous chip like T210/T124 will still use the old APIs.
Signed-off-by: Bryan Wu pengw@nvidia.com (swarren, simplified some ifdefs, removed indent level inside an ifdef) Signed-off-by: Stephen Warren swarren@nvidia.com Cc: Heiko Schocher hs@denx.de --- drivers/i2c/tegra_i2c.c | 80 ++++++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 76 insertions(+), 4 deletions(-)
diff --git a/drivers/i2c/tegra_i2c.c b/drivers/i2c/tegra_i2c.c index 2fa07f9c57c4..b8cb24ec87d5 100644 --- a/drivers/i2c/tegra_i2c.c +++ b/drivers/i2c/tegra_i2c.c @@ -12,11 +12,16 @@ #include <fdtdec.h> #include <i2c.h> #include <asm/io.h> +#ifdef CONFIG_TEGRA186 +#include <clk.h> +#include <reset.h> +#else #include <asm/arch/clock.h> #include <asm/arch/funcmux.h> -#include <asm/arch/gpio.h> #include <asm/arch/pinmux.h> #include <asm/arch-tegra/clk_rst.h> +#endif +#include <asm/arch/gpio.h> #include <asm/arch-tegra/tegra_i2c.h>
DECLARE_GLOBAL_DATA_PTR; @@ -30,7 +35,12 @@ enum i2c_type { /* Information about i2c controller */ struct i2c_bus { int id; +#ifdef CONFIG_TEGRA186 + struct reset_ctl reset_ctl; + struct clk clk; +#else enum periph_id periph_id; +#endif int speed; int pinmux_config; struct i2c_control *control; @@ -62,12 +72,41 @@ static void set_packet_mode(struct i2c_bus *i2c_bus) static void i2c_reset_controller(struct i2c_bus *i2c_bus) { /* Reset I2C controller. */ +#ifdef CONFIG_TEGRA186 + reset_assert(&i2c_bus->reset_ctl); + udelay(1); + reset_deassert(&i2c_bus->reset_ctl); + udelay(1); +#else reset_periph(i2c_bus->periph_id, 1); +#endif
/* re-program config register to packet mode */ set_packet_mode(i2c_bus); }
+#ifdef CONFIG_TEGRA186 +static int i2c_init_clock(struct i2c_bus *i2c_bus, unsigned rate) +{ + int ret; + + ret = reset_assert(&i2c_bus->reset_ctl); + if (ret) + return ret; + ret = clk_enable(&i2c_bus->clk); + if (ret) + return ret; + ret = clk_set_rate(&i2c_bus->clk, rate); + if (IS_ERR_VALUE(ret)) + return ret; + ret = reset_deassert(&i2c_bus->reset_ctl); + if (ret) + return ret; + + return 0; +} +#endif + static void i2c_init_controller(struct i2c_bus *i2c_bus) { if (!i2c_bus->speed) @@ -78,8 +117,12 @@ static void i2c_init_controller(struct i2c_bus *i2c_bus) * here, in section 23.3.1, but in fact we seem to need a factor of * 16 to get the right frequency. */ +#ifdef CONFIG_TEGRA186 + i2c_init_clock(i2c_bus, i2c_bus->speed * 2 * 8); +#else clock_start_periph_pll(i2c_bus->periph_id, CLOCK_ID_PERIPH, i2c_bus->speed * 2 * 8); +#endif
if (i2c_bus->type == TYPE_114) { /* @@ -94,12 +137,17 @@ static void i2c_init_controller(struct i2c_bus *i2c_bus) * is running, we hang, and we need it for the new calc. */ int clk_div_stdfst_mode = readl(&i2c_bus->regs->clk_div) >> 16; + unsigned rate = CLK_MULT_STD_FAST_MODE * + (clk_div_stdfst_mode + 1) * i2c_bus->speed * 2; debug("%s: CLK_DIV_STD_FAST_MODE setting = %d\n", __func__, clk_div_stdfst_mode);
+#ifdef CONFIG_TEGRA186 + i2c_init_clock(i2c_bus, rate); +#else 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); + rate); +#endif }
/* Reset I2C controller. */ @@ -112,7 +160,9 @@ static void i2c_init_controller(struct i2c_bus *i2c_bus) setbits_le32(&dvc->ctrl3, DVC_CTRL_REG3_I2C_HW_SW_PROG_MASK); }
+#ifndef CONFIG_TEGRA186 funcmux_select(i2c_bus->periph_id, i2c_bus->pinmux_config); +#endif }
static void send_packet_headers( @@ -333,8 +383,12 @@ static int tegra_i2c_set_bus_speed(struct udevice *dev, unsigned int speed) static int tegra_i2c_probe(struct udevice *dev) { struct i2c_bus *i2c_bus = dev_get_priv(dev); +#ifdef CONFIG_TEGRA186 + int ret; +#else const void *blob = gd->fdt_blob; int node = dev->of_offset; +#endif bool is_dvc;
i2c_bus->id = dev->seq; @@ -345,6 +399,18 @@ static int tegra_i2c_probe(struct udevice *dev) * We don't have a binding for pinmux yet. Leave it out for now. So * far no one needs anything other than the default. */ +#ifdef CONFIG_TEGRA186 + ret = reset_get_by_name(dev, "i2c", &i2c_bus->reset_ctl); + if (ret) { + error("reset_get_by_name() failed: %d\n", ret); + return ret; + } + ret = clk_get_by_name(dev, "i2c", &i2c_bus->clk); + if (ret) { + error("clk_get_by_name() failed: %d\n", ret); + return ret; + } +#else i2c_bus->pinmux_config = FUNCMUX_DEFAULT; i2c_bus->periph_id = clock_decode_periph_id(blob, node);
@@ -359,6 +425,7 @@ static int tegra_i2c_probe(struct udevice *dev) */ if (i2c_bus->periph_id == -1) return -EINVAL; +#endif
is_dvc = dev_get_driver_data(dev) == TYPE_DVC; if (is_dvc) { @@ -370,7 +437,12 @@ static int tegra_i2c_probe(struct udevice *dev) i2c_init_controller(i2c_bus); debug("%s: controller bus %d at %p, periph_id %d, speed %d: ", is_dvc ? "dvc" : "i2c", dev->seq, i2c_bus->regs, - i2c_bus->periph_id, i2c_bus->speed); +#ifndef CONFIG_TEGRA186 + i2c_bus->periph_id, +#else + -1, +#endif + i2c_bus->speed);
return 0; }