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 <b35083@freescale.com>
Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index dc9f2ec..ce31196 100644 (file)
--- 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);