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i2c: tegra: add i2c interface timing support
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This patch adds I2C interface timing registers support for
proper bus rate configuration along with meeting the I2C spec
setup and hold times based on the tuning performed on Tegra210,
Tegra186 and Tegra194 platforms.

I2C_INTERFACE_TIMING_0 register contains TLOW and THIGH field
and Tegra I2C controller design uses them as a part of internal
clock divisor.

I2C_INTERFACE_TIMING_1 register contains the setup and hold times
for start and stop conditions.

Acked-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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Sowjanya Komatineni authored and Wolfram Sang committed Feb 14, 2019
1 parent 80d4062 commit 0940d24
Showing 1 changed file with 159 additions and 30 deletions.
189 changes: 159 additions & 30 deletions drivers/i2c/busses/i2c-tegra.c
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Original file line number Diff line number Diff line change
Expand Up @@ -126,6 +126,15 @@
#define I2C_MST_FIFO_STATUS_TX_MASK 0xff0000
#define I2C_MST_FIFO_STATUS_TX_SHIFT 16

#define I2C_INTERFACE_TIMING_0 0x94
#define I2C_THIGH_SHIFT 8
#define I2C_INTERFACE_TIMING_1 0x98

#define I2C_STANDARD_MODE 100000
#define I2C_FAST_MODE 400000
#define I2C_FAST_PLUS_MODE 1000000
#define I2C_HS_MODE 3500000

/* Packet header size in bytes */
#define I2C_PACKET_HEADER_SIZE 12

Expand Down Expand Up @@ -160,7 +169,10 @@ enum msg_end_type {
* @has_config_load_reg: Has the config load register to load the new
* configuration.
* @clk_divisor_hs_mode: Clock divisor in HS mode.
* @clk_divisor_std_fast_mode: Clock divisor in standard/fast mode. It is
* @clk_divisor_std_mode: Clock divisor in standard mode. It is
* applicable if there is no fast clock source i.e. single clock
* source.
* @clk_divisor_fast_mode: Clock divisor in fast mode. It is
* applicable if there is no fast clock source i.e. single clock
* source.
* @clk_divisor_fast_plus_mode: Clock divisor in fast mode plus. It is
Expand All @@ -178,21 +190,42 @@ enum msg_end_type {
* @supports_bus_clear: Bus Clear support to recover from bus hang during
* SDA stuck low from device for some unknown reasons.
* @has_apb_dma: Support of APBDMA on corresponding Tegra chip.
* @tlow_std_mode: Low period of the clock in standard mode.
* @thigh_std_mode: High period of the clock in standard mode.
* @tlow_fast_fastplus_mode: Low period of the clock in fast/fast-plus modes.
* @thigh_fast_fastplus_mode: High period of the clock in fast/fast-plus modes.
* @setup_hold_time_std_mode: Setup and hold time for start and stop conditions
* in standard mode.
* @setup_hold_time_fast_fast_plus_mode: Setup and hold time for start and stop
* conditions in fast/fast-plus modes.
* @setup_hold_time_hs_mode: Setup and hold time for start and stop conditions
* in HS mode.
* @has_interface_timing_reg: Has interface timing register to program the tuned
* timing settings.
*/
struct tegra_i2c_hw_feature {
bool has_continue_xfer_support;
bool has_per_pkt_xfer_complete_irq;
bool has_single_clk_source;
bool has_config_load_reg;
int clk_divisor_hs_mode;
int clk_divisor_std_fast_mode;
int clk_divisor_std_mode;
int clk_divisor_fast_mode;
u16 clk_divisor_fast_plus_mode;
bool has_multi_master_mode;
bool has_slcg_override_reg;
bool has_mst_fifo;
const struct i2c_adapter_quirks *quirks;
bool supports_bus_clear;
bool has_apb_dma;
u8 tlow_std_mode;
u8 thigh_std_mode;
u8 tlow_fast_fastplus_mode;
u8 thigh_fast_fastplus_mode;
u32 setup_hold_time_std_mode;
u32 setup_hold_time_fast_fast_plus_mode;
u32 setup_hold_time_hs_mode;
bool has_interface_timing_reg;
};

/**
Expand Down Expand Up @@ -660,11 +693,13 @@ static int tegra_i2c_wait_for_config_load(struct tegra_i2c_dev *i2c_dev)
return 0;
}

static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev)
static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev, bool clk_reinit)
{
u32 val;
int err;
u32 clk_divisor;
u32 clk_divisor, clk_multiplier;
u32 tsu_thd = 0;
u8 tlow, thigh;

err = pm_runtime_get_sync(i2c_dev->dev);
if (err < 0) {
Expand Down Expand Up @@ -694,6 +729,41 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev)
I2C_CLK_DIVISOR_STD_FAST_MODE_SHIFT;
i2c_writel(i2c_dev, clk_divisor, I2C_CLK_DIVISOR);

if (i2c_dev->bus_clk_rate > I2C_STANDARD_MODE &&
i2c_dev->bus_clk_rate <= I2C_FAST_PLUS_MODE) {
tlow = i2c_dev->hw->tlow_fast_fastplus_mode;
thigh = i2c_dev->hw->thigh_fast_fastplus_mode;
tsu_thd = i2c_dev->hw->setup_hold_time_fast_fast_plus_mode;
} else {
tlow = i2c_dev->hw->tlow_std_mode;
thigh = i2c_dev->hw->thigh_std_mode;
tsu_thd = i2c_dev->hw->setup_hold_time_std_mode;
}

if (i2c_dev->hw->has_interface_timing_reg) {
val = (thigh << I2C_THIGH_SHIFT) | tlow;
i2c_writel(i2c_dev, val, I2C_INTERFACE_TIMING_0);
}

/*
* configure setup and hold times only when tsu_thd is non-zero.
* otherwise, preserve the chip default values
*/
if (i2c_dev->hw->has_interface_timing_reg && tsu_thd)
i2c_writel(i2c_dev, tsu_thd, I2C_INTERFACE_TIMING_1);

if (!clk_reinit) {
clk_multiplier = (tlow + thigh + 2);
clk_multiplier *= (i2c_dev->clk_divisor_non_hs_mode + 1);
err = clk_set_rate(i2c_dev->div_clk,
i2c_dev->bus_clk_rate * clk_multiplier);
if (err) {
dev_err(i2c_dev->dev,
"failed changing clock rate: %d\n", err);
goto err;
}
}

if (!i2c_dev->is_dvc) {
u32 sl_cfg = i2c_readl(i2c_dev, I2C_SL_CNFG);

Expand Down Expand Up @@ -1097,7 +1167,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
dmaengine_terminate_sync(i2c_dev->msg_read ?
i2c_dev->rx_dma_chan :
i2c_dev->tx_dma_chan);
tegra_i2c_init(i2c_dev);
tegra_i2c_init(i2c_dev, true);
return -ETIMEDOUT;
}

Expand All @@ -1123,7 +1193,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
if (time_left == 0) {
dev_err(i2c_dev->dev, "i2c transfer timed out\n");

tegra_i2c_init(i2c_dev);
tegra_i2c_init(i2c_dev, true);
return -ETIMEDOUT;
}

Expand All @@ -1135,7 +1205,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
if (likely(i2c_dev->msg_err == I2C_ERR_NONE))
return 0;

tegra_i2c_init(i2c_dev);
tegra_i2c_init(i2c_dev, true);
/* start recovery upon arbitration loss in single master mode */
if (i2c_dev->msg_err == I2C_ERR_ARBITRATION_LOST) {
if (!i2c_dev->is_multimaster_mode)
Expand Down Expand Up @@ -1235,7 +1305,8 @@ static const struct tegra_i2c_hw_feature tegra20_i2c_hw = {
.has_per_pkt_xfer_complete_irq = false,
.has_single_clk_source = false,
.clk_divisor_hs_mode = 3,
.clk_divisor_std_fast_mode = 0,
.clk_divisor_std_mode = 0,
.clk_divisor_fast_mode = 0,
.clk_divisor_fast_plus_mode = 0,
.has_config_load_reg = false,
.has_multi_master_mode = false,
Expand All @@ -1244,14 +1315,23 @@ static const struct tegra_i2c_hw_feature tegra20_i2c_hw = {
.quirks = &tegra_i2c_quirks,
.supports_bus_clear = false,
.has_apb_dma = true,
.tlow_std_mode = 0x4,
.thigh_std_mode = 0x2,
.tlow_fast_fastplus_mode = 0x4,
.thigh_fast_fastplus_mode = 0x2,
.setup_hold_time_std_mode = 0x0,
.setup_hold_time_fast_fast_plus_mode = 0x0,
.setup_hold_time_hs_mode = 0x0,
.has_interface_timing_reg = false,
};

static const struct tegra_i2c_hw_feature tegra30_i2c_hw = {
.has_continue_xfer_support = true,
.has_per_pkt_xfer_complete_irq = false,
.has_single_clk_source = false,
.clk_divisor_hs_mode = 3,
.clk_divisor_std_fast_mode = 0,
.clk_divisor_std_mode = 0,
.clk_divisor_fast_mode = 0,
.clk_divisor_fast_plus_mode = 0,
.has_config_load_reg = false,
.has_multi_master_mode = false,
Expand All @@ -1260,14 +1340,23 @@ static const struct tegra_i2c_hw_feature tegra30_i2c_hw = {
.quirks = &tegra_i2c_quirks,
.supports_bus_clear = false,
.has_apb_dma = true,
.tlow_std_mode = 0x4,
.thigh_std_mode = 0x2,
.tlow_fast_fastplus_mode = 0x4,
.thigh_fast_fastplus_mode = 0x2,
.setup_hold_time_std_mode = 0x0,
.setup_hold_time_fast_fast_plus_mode = 0x0,
.setup_hold_time_hs_mode = 0x0,
.has_interface_timing_reg = false,
};

static const struct tegra_i2c_hw_feature tegra114_i2c_hw = {
.has_continue_xfer_support = true,
.has_per_pkt_xfer_complete_irq = true,
.has_single_clk_source = true,
.clk_divisor_hs_mode = 1,
.clk_divisor_std_fast_mode = 0x19,
.clk_divisor_std_mode = 0x19,
.clk_divisor_fast_mode = 0x19,
.clk_divisor_fast_plus_mode = 0x10,
.has_config_load_reg = false,
.has_multi_master_mode = false,
Expand All @@ -1276,14 +1365,23 @@ static const struct tegra_i2c_hw_feature tegra114_i2c_hw = {
.quirks = &tegra_i2c_quirks,
.supports_bus_clear = true,
.has_apb_dma = true,
.tlow_std_mode = 0x4,
.thigh_std_mode = 0x2,
.tlow_fast_fastplus_mode = 0x4,
.thigh_fast_fastplus_mode = 0x2,
.setup_hold_time_std_mode = 0x0,
.setup_hold_time_fast_fast_plus_mode = 0x0,
.setup_hold_time_hs_mode = 0x0,
.has_interface_timing_reg = false,
};

static const struct tegra_i2c_hw_feature tegra124_i2c_hw = {
.has_continue_xfer_support = true,
.has_per_pkt_xfer_complete_irq = true,
.has_single_clk_source = true,
.clk_divisor_hs_mode = 1,
.clk_divisor_std_fast_mode = 0x19,
.clk_divisor_std_mode = 0x19,
.clk_divisor_fast_mode = 0x19,
.clk_divisor_fast_plus_mode = 0x10,
.has_config_load_reg = true,
.has_multi_master_mode = false,
Expand All @@ -1292,14 +1390,23 @@ static const struct tegra_i2c_hw_feature tegra124_i2c_hw = {
.quirks = &tegra_i2c_quirks,
.supports_bus_clear = true,
.has_apb_dma = true,
.tlow_std_mode = 0x4,
.thigh_std_mode = 0x2,
.tlow_fast_fastplus_mode = 0x4,
.thigh_fast_fastplus_mode = 0x2,
.setup_hold_time_std_mode = 0x0,
.setup_hold_time_fast_fast_plus_mode = 0x0,
.setup_hold_time_hs_mode = 0x0,
.has_interface_timing_reg = true,
};

static const struct tegra_i2c_hw_feature tegra210_i2c_hw = {
.has_continue_xfer_support = true,
.has_per_pkt_xfer_complete_irq = true,
.has_single_clk_source = true,
.clk_divisor_hs_mode = 1,
.clk_divisor_std_fast_mode = 0x19,
.clk_divisor_std_mode = 0x19,
.clk_divisor_fast_mode = 0x19,
.clk_divisor_fast_plus_mode = 0x10,
.has_config_load_reg = true,
.has_multi_master_mode = true,
Expand All @@ -1308,14 +1415,23 @@ static const struct tegra_i2c_hw_feature tegra210_i2c_hw = {
.quirks = &tegra_i2c_quirks,
.supports_bus_clear = true,
.has_apb_dma = true,
.tlow_std_mode = 0x4,
.thigh_std_mode = 0x2,
.tlow_fast_fastplus_mode = 0x4,
.thigh_fast_fastplus_mode = 0x2,
.setup_hold_time_std_mode = 0,
.setup_hold_time_fast_fast_plus_mode = 0,
.setup_hold_time_hs_mode = 0,
.has_interface_timing_reg = true,
};

static const struct tegra_i2c_hw_feature tegra186_i2c_hw = {
.has_continue_xfer_support = true,
.has_per_pkt_xfer_complete_irq = true,
.has_single_clk_source = true,
.clk_divisor_hs_mode = 1,
.clk_divisor_std_fast_mode = 0x19,
.clk_divisor_std_mode = 0x16,
.clk_divisor_fast_mode = 0x19,
.clk_divisor_fast_plus_mode = 0x10,
.has_config_load_reg = true,
.has_multi_master_mode = true,
Expand All @@ -1324,22 +1440,39 @@ static const struct tegra_i2c_hw_feature tegra186_i2c_hw = {
.quirks = &tegra_i2c_quirks,
.supports_bus_clear = true,
.has_apb_dma = false,
.tlow_std_mode = 0x4,
.thigh_std_mode = 0x3,
.tlow_fast_fastplus_mode = 0x4,
.thigh_fast_fastplus_mode = 0x2,
.setup_hold_time_std_mode = 0,
.setup_hold_time_fast_fast_plus_mode = 0,
.setup_hold_time_hs_mode = 0,
.has_interface_timing_reg = true,
};

static const struct tegra_i2c_hw_feature tegra194_i2c_hw = {
.has_continue_xfer_support = true,
.has_per_pkt_xfer_complete_irq = true,
.has_single_clk_source = true,
.clk_divisor_hs_mode = 1,
.clk_divisor_std_fast_mode = 0x19,
.clk_divisor_fast_plus_mode = 0x10,
.clk_divisor_std_mode = 0x4f,
.clk_divisor_fast_mode = 0x3c,
.clk_divisor_fast_plus_mode = 0x16,
.has_config_load_reg = true,
.has_multi_master_mode = true,
.has_slcg_override_reg = true,
.has_mst_fifo = true,
.quirks = &tegra194_i2c_quirks,
.supports_bus_clear = true,
.has_apb_dma = false,
.tlow_std_mode = 0x8,
.thigh_std_mode = 0x7,
.tlow_fast_fastplus_mode = 0x2,
.thigh_fast_fastplus_mode = 0x2,
.setup_hold_time_std_mode = 0x08080808,
.setup_hold_time_fast_fast_plus_mode = 0x02020202,
.setup_hold_time_hs_mode = 0x090909,
.has_interface_timing_reg = true,
};

/* Match table for of_platform binding */
Expand All @@ -1366,7 +1499,6 @@ static int tegra_i2c_probe(struct platform_device *pdev)
phys_addr_t base_phys;
int irq;
int ret = 0;
int clk_multiplier = I2C_CLK_MULTIPLIER_STD_FAST_MODE;

res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base_phys = res->start;
Expand Down Expand Up @@ -1438,20 +1570,17 @@ static int tegra_i2c_probe(struct platform_device *pdev)
}
}

i2c_dev->clk_divisor_non_hs_mode =
i2c_dev->hw->clk_divisor_std_fast_mode;
if (i2c_dev->hw->clk_divisor_fast_plus_mode &&
(i2c_dev->bus_clk_rate == 1000000))
if (i2c_dev->bus_clk_rate > I2C_FAST_MODE &&
i2c_dev->bus_clk_rate <= I2C_FAST_PLUS_MODE)
i2c_dev->clk_divisor_non_hs_mode =
i2c_dev->hw->clk_divisor_fast_plus_mode;

clk_multiplier *= (i2c_dev->clk_divisor_non_hs_mode + 1);
ret = clk_set_rate(i2c_dev->div_clk,
i2c_dev->bus_clk_rate * clk_multiplier);
if (ret) {
dev_err(i2c_dev->dev, "Clock rate change failed %d\n", ret);
goto unprepare_fast_clk;
}
i2c_dev->hw->clk_divisor_fast_plus_mode;
else if (i2c_dev->bus_clk_rate > I2C_STANDARD_MODE &&
i2c_dev->bus_clk_rate <= I2C_FAST_MODE)
i2c_dev->clk_divisor_non_hs_mode =
i2c_dev->hw->clk_divisor_fast_mode;
else
i2c_dev->clk_divisor_non_hs_mode =
i2c_dev->hw->clk_divisor_std_mode;

ret = clk_prepare(i2c_dev->div_clk);
if (ret < 0) {
Expand Down Expand Up @@ -1484,7 +1613,7 @@ static int tegra_i2c_probe(struct platform_device *pdev)
if (ret < 0)
goto disable_div_clk;

ret = tegra_i2c_init(i2c_dev);
ret = tegra_i2c_init(i2c_dev, false);
if (ret) {
dev_err(&pdev->dev, "Failed to initialize i2c controller\n");
goto release_dma;
Expand Down

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