From 4b775022f6fdcfba6d219f46b2606e77a0dc38d9 Mon Sep 17 00:00:00 2001 From: Jingchang Lu Date: Wed, 7 Aug 2013 17:05:42 +0800 Subject: [PATCH] i2c: imx: add struct to hold more configurable quirks This add struct imx_i2c_hwdata to hold more quirks data which may vary between SoCs, thus the driver can operate on more differences to support more SoCs. Signed-off-by: Jingchang Lu Reviewed-by: Sascha Hauer Signed-off-by: Wolfram Sang --- drivers/i2c/busses/i2c-imx.c | 77 ++++++++++++++++++++++++------------ 1 file changed, 52 insertions(+), 25 deletions(-) diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c index dc9f2ec22a29..ce31196bb5e7 100644 --- a/drivers/i2c/busses/i2c-imx.c +++ b/drivers/i2c/busses/i2c-imx.c @@ -108,9 +108,6 @@ #define I2CR_IEN_OPCODE_0 0x0 #define I2CR_IEN_OPCODE_1 I2CR_IEN -#define IMX_I2SR_CLR_OPCODE I2SR_CLR_OPCODE_W0C -#define IMX_I2CR_IEN_OPCODE I2CR_IEN_OPCODE_1 - /** Variables ****************************************************************** *******************************************************************************/ @@ -127,7 +124,7 @@ struct imx_i2c_clk_pair { u16 val; }; -static struct imx_i2c_clk_pair __initdata i2c_clk_div[] = { +static struct imx_i2c_clk_pair imx_i2c_clk_div[] = { { 22, 0x20 }, { 24, 0x21 }, { 26, 0x22 }, { 28, 0x23 }, { 30, 0x00 }, { 32, 0x24 }, { 36, 0x25 }, { 40, 0x26 }, { 42, 0x03 }, { 44, 0x27 }, { 48, 0x28 }, { 52, 0x05 }, @@ -148,6 +145,15 @@ enum imx_i2c_type { IMX21_I2C, }; +struct imx_i2c_hwdata { + enum imx_i2c_type devtype; + unsigned regshift; + struct imx_i2c_clk_pair *clk_div; + unsigned ndivs; + unsigned i2sr_clr_opcode; + unsigned i2cr_ien_opcode; +}; + struct imx_i2c_struct { struct i2c_adapter adapter; struct clk *clk; @@ -157,16 +163,36 @@ struct imx_i2c_struct { unsigned int disable_delay; int stopped; unsigned int ifdr; /* IMX_I2C_IFDR */ - enum imx_i2c_type devtype; + const struct imx_i2c_hwdata *hwdata; +}; + +static const struct imx_i2c_hwdata imx1_i2c_hwdata = { + .devtype = IMX1_I2C, + .regshift = IMX_I2C_REGSHIFT, + .clk_div = imx_i2c_clk_div, + .ndivs = ARRAY_SIZE(imx_i2c_clk_div), + .i2sr_clr_opcode = I2SR_CLR_OPCODE_W0C, + .i2cr_ien_opcode = I2CR_IEN_OPCODE_1, + +}; + +static const struct imx_i2c_hwdata imx21_i2c_hwdata = { + .devtype = IMX21_I2C, + .regshift = IMX_I2C_REGSHIFT, + .clk_div = imx_i2c_clk_div, + .ndivs = ARRAY_SIZE(imx_i2c_clk_div), + .i2sr_clr_opcode = I2SR_CLR_OPCODE_W0C, + .i2cr_ien_opcode = I2CR_IEN_OPCODE_1, + }; static struct platform_device_id imx_i2c_devtype[] = { { .name = "imx1-i2c", - .driver_data = IMX1_I2C, + .driver_data = (kernel_ulong_t)&imx1_i2c_hwdata, }, { .name = "imx21-i2c", - .driver_data = IMX21_I2C, + .driver_data = (kernel_ulong_t)&imx21_i2c_hwdata, }, { /* sentinel */ } @@ -174,27 +200,27 @@ static struct platform_device_id imx_i2c_devtype[] = { MODULE_DEVICE_TABLE(platform, imx_i2c_devtype); static const struct of_device_id i2c_imx_dt_ids[] = { - { .compatible = "fsl,imx1-i2c", .data = &imx_i2c_devtype[IMX1_I2C], }, - { .compatible = "fsl,imx21-i2c", .data = &imx_i2c_devtype[IMX21_I2C], }, + { .compatible = "fsl,imx1-i2c", .data = &imx1_i2c_hwdata, }, + { .compatible = "fsl,imx21-i2c", .data = &imx21_i2c_hwdata, }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, i2c_imx_dt_ids); static inline int is_imx1_i2c(struct imx_i2c_struct *i2c_imx) { - return i2c_imx->devtype == IMX1_I2C; + return i2c_imx->hwdata->devtype == IMX1_I2C; } static inline void imx_i2c_write_reg(unsigned int val, struct imx_i2c_struct *i2c_imx, unsigned int reg) { - writeb(val, i2c_imx->base + (reg << IMX_I2C_REGSHIFT)); + writeb(val, i2c_imx->base + (reg << i2c_imx->hwdata->regshift)); } static inline unsigned char imx_i2c_read_reg(struct imx_i2c_struct *i2c_imx, unsigned int reg) { - return readb(i2c_imx->base + (reg << IMX_I2C_REGSHIFT)); + return readb(i2c_imx->base + (reg << i2c_imx->hwdata->regshift)); } /** Functions for IMX I2C adapter driver *************************************** @@ -258,8 +284,8 @@ static int i2c_imx_start(struct imx_i2c_struct *i2c_imx) clk_prepare_enable(i2c_imx->clk); imx_i2c_write_reg(i2c_imx->ifdr, i2c_imx, IMX_I2C_IFDR); /* Enable I2C controller */ - imx_i2c_write_reg(IMX_I2SR_CLR_OPCODE, i2c_imx, IMX_I2C_I2SR); - imx_i2c_write_reg(IMX_I2CR_IEN_OPCODE, i2c_imx, IMX_I2C_I2CR); + imx_i2c_write_reg(i2c_imx->hwdata->i2sr_clr_opcode, i2c_imx, IMX_I2C_I2SR); + imx_i2c_write_reg(i2c_imx->hwdata->i2cr_ien_opcode, i2c_imx, IMX_I2C_I2CR); /* Wait controller to be stable */ udelay(50); @@ -303,13 +329,15 @@ static void i2c_imx_stop(struct imx_i2c_struct *i2c_imx) } /* Disable I2C controller */ - imx_i2c_write_reg(IMX_I2CR_IEN_OPCODE ^ I2CR_IEN, i2c_imx, IMX_I2C_I2CR); + temp = i2c_imx->hwdata->i2cr_ien_opcode ^ I2CR_IEN, + imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); clk_disable_unprepare(i2c_imx->clk); } static void __init i2c_imx_set_clk(struct imx_i2c_struct *i2c_imx, unsigned int rate) { + struct imx_i2c_clk_pair *i2c_clk_div = i2c_imx->hwdata->clk_div; unsigned int i2c_clk_rate; unsigned int div; int i; @@ -319,8 +347,8 @@ static void __init i2c_imx_set_clk(struct imx_i2c_struct *i2c_imx, div = (i2c_clk_rate + rate - 1) / rate; if (div < i2c_clk_div[0].div) i = 0; - else if (div > i2c_clk_div[ARRAY_SIZE(i2c_clk_div) - 1].div) - i = ARRAY_SIZE(i2c_clk_div) - 1; + else if (div > i2c_clk_div[i2c_imx->hwdata->ndivs - 1].div) + i = i2c_imx->hwdata->ndivs - 1; else for (i = 0; i2c_clk_div[i].div < div; i++); @@ -355,7 +383,7 @@ static irqreturn_t i2c_imx_isr(int irq, void *dev_id) /* save status register */ i2c_imx->i2csr = temp; temp &= ~I2SR_IIF; - temp |= (IMX_I2SR_CLR_OPCODE & I2SR_IIF); + temp |= (i2c_imx->hwdata->i2sr_clr_opcode & I2SR_IIF); imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2SR); wake_up(&i2c_imx->queue); return IRQ_HANDLED; @@ -537,7 +565,6 @@ static int __init i2c_imx_probe(struct platform_device *pdev) struct imx_i2c_struct *i2c_imx; struct resource *res; struct imxi2c_platform_data *pdata = pdev->dev.platform_data; - const struct platform_device_id *imx_id; void __iomem *base; int irq, ret; u32 bitrate; @@ -563,11 +590,10 @@ static int __init i2c_imx_probe(struct platform_device *pdev) } if (of_id) - imx_id = of_id->data; + i2c_imx->hwdata = of_id->data; else - imx_id = platform_get_device_id(pdev); - - i2c_imx->devtype = imx_id->driver_data; + i2c_imx->hwdata = (struct imx_i2c_hwdata *) + platform_get_device_id(pdev)->driver_data; /* Setup i2c_imx driver structure */ strlcpy(i2c_imx->adapter.name, pdev->name, sizeof(i2c_imx->adapter.name)); @@ -613,8 +639,9 @@ static int __init i2c_imx_probe(struct platform_device *pdev) i2c_imx_set_clk(i2c_imx, bitrate); /* Set up chip registers to defaults */ - imx_i2c_write_reg(IMX_I2CR_IEN_OPCODE ^ I2CR_IEN, i2c_imx, IMX_I2C_I2CR); - imx_i2c_write_reg(IMX_I2SR_CLR_OPCODE, i2c_imx, IMX_I2C_I2SR); + imx_i2c_write_reg(i2c_imx->hwdata->i2cr_ien_opcode ^ I2CR_IEN, + i2c_imx, IMX_I2C_I2CR); + imx_i2c_write_reg(i2c_imx->hwdata->i2sr_clr_opcode, i2c_imx, IMX_I2C_I2SR); /* Add I2C adapter */ ret = i2c_add_numbered_adapter(&i2c_imx->adapter);