diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-tegra.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-tegra.c | 130 |
1 files changed, 92 insertions, 38 deletions
diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c index 9a08c57bc936..f981ac4e6783 100644 --- a/drivers/i2c/busses/i2c-tegra.c +++ b/drivers/i2c/busses/i2c-tegra.c @@ -27,6 +27,7 @@ #include <linux/slab.h> #include <linux/i2c-tegra.h> #include <linux/of_i2c.h> +#include <linux/of_device.h> #include <linux/module.h> #include <asm/unaligned.h> @@ -114,11 +115,21 @@ enum msg_end_type { }; /** + * struct tegra_i2c_hw_feature : Different HW support on Tegra + * @has_continue_xfer_support: Continue transfer supports. + */ + +struct tegra_i2c_hw_feature { + bool has_continue_xfer_support; +}; + +/** * struct tegra_i2c_dev - per device i2c context * @dev: device reference for power management + * @hw: Tegra i2c hw feature. * @adapter: core i2c layer adapter information - * @clk: clock reference for i2c controller - * @i2c_clk: clock reference for i2c bus + * @div_clk: clock reference for div clock of i2c controller. + * @fast_clk: clock reference for fast clock of i2c controller. * @base: ioremapped registers cookie * @cont_id: i2c controller id, used for for packet header * @irq: irq number of transfer complete interrupt @@ -133,9 +144,10 @@ enum msg_end_type { */ struct tegra_i2c_dev { struct device *dev; + const struct tegra_i2c_hw_feature *hw; struct i2c_adapter adapter; - struct clk *clk; - struct clk *i2c_clk; + struct clk *div_clk; + struct clk *fast_clk; void __iomem *base; int cont_id; int irq; @@ -351,16 +363,40 @@ static void tegra_dvc_init(struct tegra_i2c_dev *i2c_dev) dvc_writel(i2c_dev, val, DVC_CTRL_REG1); } +static inline int tegra_i2c_clock_enable(struct tegra_i2c_dev *i2c_dev) +{ + int ret; + ret = clk_prepare_enable(i2c_dev->fast_clk); + if (ret < 0) { + dev_err(i2c_dev->dev, + "Enabling fast clk failed, err %d\n", ret); + return ret; + } + ret = clk_prepare_enable(i2c_dev->div_clk); + if (ret < 0) { + dev_err(i2c_dev->dev, + "Enabling div clk failed, err %d\n", ret); + clk_disable_unprepare(i2c_dev->fast_clk); + } + return ret; +} + +static inline void tegra_i2c_clock_disable(struct tegra_i2c_dev *i2c_dev) +{ + clk_disable_unprepare(i2c_dev->div_clk); + clk_disable_unprepare(i2c_dev->fast_clk); +} + static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev) { u32 val; int err = 0; - clk_prepare_enable(i2c_dev->clk); + tegra_i2c_clock_enable(i2c_dev); - tegra_periph_reset_assert(i2c_dev->clk); + tegra_periph_reset_assert(i2c_dev->div_clk); udelay(2); - tegra_periph_reset_deassert(i2c_dev->clk); + tegra_periph_reset_deassert(i2c_dev->div_clk); if (i2c_dev->is_dvc) tegra_dvc_init(i2c_dev); @@ -369,7 +405,7 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev) (0x2 << I2C_CNFG_DEBOUNCE_CNT_SHIFT); i2c_writel(i2c_dev, val, I2C_CNFG); i2c_writel(i2c_dev, 0, I2C_INT_MASK); - clk_set_rate(i2c_dev->clk, i2c_dev->bus_clk_rate * 8); + clk_set_rate(i2c_dev->div_clk, i2c_dev->bus_clk_rate * 8); if (!i2c_dev->is_dvc) { u32 sl_cfg = i2c_readl(i2c_dev, I2C_SL_CNFG); @@ -387,7 +423,7 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev) if (tegra_i2c_flush_fifos(i2c_dev)) err = -ETIMEDOUT; - clk_disable_unprepare(i2c_dev->clk); + tegra_i2c_clock_disable(i2c_dev); if (i2c_dev->irq_disabled) { i2c_dev->irq_disabled = 0; @@ -563,7 +599,7 @@ static int tegra_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], if (i2c_dev->is_suspended) return -EBUSY; - clk_prepare_enable(i2c_dev->clk); + tegra_i2c_clock_enable(i2c_dev); for (i = 0; i < num; i++) { enum msg_end_type end_type = MSG_END_STOP; if (i < (num - 1)) { @@ -576,14 +612,19 @@ static int tegra_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], if (ret) break; } - clk_disable_unprepare(i2c_dev->clk); + tegra_i2c_clock_disable(i2c_dev); return ret ?: i; } static u32 tegra_i2c_func(struct i2c_adapter *adap) { - return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR | - I2C_FUNC_PROTOCOL_MANGLING | I2C_FUNC_NOSTART; + struct tegra_i2c_dev *i2c_dev = i2c_get_adapdata(adap); + u32 ret = I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR | + I2C_FUNC_PROTOCOL_MANGLING; + + if (i2c_dev->hw->has_continue_xfer_support) + ret |= I2C_FUNC_NOSTART; + return ret; } static const struct i2c_algorithm tegra_i2c_algo = { @@ -591,13 +632,32 @@ static const struct i2c_algorithm tegra_i2c_algo = { .functionality = tegra_i2c_func, }; +static const struct tegra_i2c_hw_feature tegra20_i2c_hw = { + .has_continue_xfer_support = false, +}; + +static const struct tegra_i2c_hw_feature tegra30_i2c_hw = { + .has_continue_xfer_support = true, +}; + +#if defined(CONFIG_OF) +/* Match table for of_platform binding */ +static const struct of_device_id tegra_i2c_of_match[] __devinitconst = { + { .compatible = "nvidia,tegra30-i2c", .data = &tegra30_i2c_hw, }, + { .compatible = "nvidia,tegra20-i2c", .data = &tegra20_i2c_hw, }, + { .compatible = "nvidia,tegra20-i2c-dvc", .data = &tegra20_i2c_hw, }, + {}, +}; +MODULE_DEVICE_TABLE(of, tegra_i2c_of_match); +#endif + static int __devinit tegra_i2c_probe(struct platform_device *pdev) { struct tegra_i2c_dev *i2c_dev; struct tegra_i2c_platform_data *pdata = pdev->dev.platform_data; struct resource *res; - struct clk *clk; - struct clk *i2c_clk; + struct clk *div_clk; + struct clk *fast_clk; const unsigned int *prop; void __iomem *base; int irq; @@ -622,16 +682,16 @@ static int __devinit tegra_i2c_probe(struct platform_device *pdev) } irq = res->start; - clk = devm_clk_get(&pdev->dev, NULL); - if (IS_ERR(clk)) { + div_clk = devm_clk_get(&pdev->dev, "div-clk"); + if (IS_ERR(div_clk)) { dev_err(&pdev->dev, "missing controller clock"); - return PTR_ERR(clk); + return PTR_ERR(div_clk); } - i2c_clk = devm_clk_get(&pdev->dev, "i2c"); - if (IS_ERR(i2c_clk)) { + fast_clk = devm_clk_get(&pdev->dev, "fast-clk"); + if (IS_ERR(fast_clk)) { dev_err(&pdev->dev, "missing bus clock"); - return PTR_ERR(i2c_clk); + return PTR_ERR(fast_clk); } i2c_dev = devm_kzalloc(&pdev->dev, sizeof(*i2c_dev), GFP_KERNEL); @@ -641,8 +701,8 @@ static int __devinit tegra_i2c_probe(struct platform_device *pdev) } i2c_dev->base = base; - i2c_dev->clk = clk; - i2c_dev->i2c_clk = i2c_clk; + i2c_dev->div_clk = div_clk; + i2c_dev->fast_clk = fast_clk; i2c_dev->adapter.algo = &tegra_i2c_algo; i2c_dev->irq = irq; i2c_dev->cont_id = pdev->id; @@ -659,11 +719,18 @@ static int __devinit tegra_i2c_probe(struct platform_device *pdev) i2c_dev->bus_clk_rate = be32_to_cpup(prop); } - if (pdev->dev.of_node) + i2c_dev->hw = &tegra20_i2c_hw; + + if (pdev->dev.of_node) { + const struct of_device_id *match; + match = of_match_device(of_match_ptr(tegra_i2c_of_match), + &pdev->dev); + i2c_dev->hw = match->data; i2c_dev->is_dvc = of_device_is_compatible(pdev->dev.of_node, "nvidia,tegra20-i2c-dvc"); - else if (pdev->id == 3) + } else if (pdev->id == 3) { i2c_dev->is_dvc = 1; + } init_completion(&i2c_dev->msg_complete); platform_set_drvdata(pdev, i2c_dev); @@ -681,8 +748,6 @@ static int __devinit tegra_i2c_probe(struct platform_device *pdev) return ret; } - clk_prepare_enable(i2c_dev->i2c_clk); - i2c_set_adapdata(&i2c_dev->adapter, i2c_dev); i2c_dev->adapter.owner = THIS_MODULE; i2c_dev->adapter.class = I2C_CLASS_HWMON; @@ -696,7 +761,6 @@ static int __devinit tegra_i2c_probe(struct platform_device *pdev) ret = i2c_add_numbered_adapter(&i2c_dev->adapter); if (ret) { dev_err(&pdev->dev, "Failed to add I2C adapter\n"); - clk_disable_unprepare(i2c_dev->i2c_clk); return ret; } @@ -751,16 +815,6 @@ static SIMPLE_DEV_PM_OPS(tegra_i2c_pm, tegra_i2c_suspend, tegra_i2c_resume); #define TEGRA_I2C_PM NULL #endif -#if defined(CONFIG_OF) -/* Match table for of_platform binding */ -static const struct of_device_id tegra_i2c_of_match[] __devinitconst = { - { .compatible = "nvidia,tegra20-i2c", }, - { .compatible = "nvidia,tegra20-i2c-dvc", }, - {}, -}; -MODULE_DEVICE_TABLE(of, tegra_i2c_of_match); -#endif - static struct platform_driver tegra_i2c_driver = { .probe = tegra_i2c_probe, .remove = __devexit_p(tegra_i2c_remove), |