Patchwork [7/8] i2c: imx: add struct to hold more configurable quirks

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Submitter Jingchang Lu
Date Aug. 7, 2013, 9:05 a.m.
Message ID <1375866343-2074-7-git-send-email-b35083@freescale.com>
Download mbox | patch
Permalink /patch/265456/
State Accepted
Headers show

Comments

Jingchang Lu - Aug. 7, 2013, 9:05 a.m.
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>
---
 drivers/i2c/busses/i2c-imx.c | 77 ++++++++++++++++++++++++++++++--------------
 1 file changed, 52 insertions(+), 25 deletions(-)

Patch

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