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authorJingchang Lu <b35083@freescale.com>2013-08-07 11:05:41 +0200
committerWolfram Sang <wsa@the-dreams.de>2013-08-15 16:13:48 +0200
commit171408c21149dd3fd2ed33f19afe2cd558269253 (patch)
tree1c60898b4f9f9c1f923f26415077ad2ec5a4b088 /drivers/i2c
parenti2c: imx: change register offset representation (diff)
downloadlinux-171408c21149dd3fd2ed33f19afe2cd558269253.tar.xz
linux-171408c21149dd3fd2ed33f19afe2cd558269253.zip
i2c: imx: add INT flag and IEN bit operatation codes
This add bits operation macro that differ between SoCs. Interrupt flags clear operation in I2SR differ between SoCs: write zero to clear(w0c) INT flag on i.MX, but write one to clear(w1c) INT flag on Vybrid. I2C module enable operation in I2CR also differ between SoCs: set I2CR_IEN bit enable the module on i.MX, but clear I2CR_IEN bit enable the module on Vybrid. 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>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-imx.c27
1 files changed, 22 insertions, 5 deletions
diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index 8a292a95e86a..dc9f2ec22a29 100644
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -95,6 +95,22 @@
#define I2CR_IIEN 0x40
#define I2CR_IEN 0x80
+/* register bits different operating codes definition:
+ * 1) I2SR: Interrupt flags clear operation differ between SoCs:
+ * - write zero to clear(w0c) INT flag on i.MX,
+ * - but write one to clear(w1c) INT flag on Vybrid.
+ * 2) I2CR: I2C module enable operation also differ between SoCs:
+ * - set I2CR_IEN bit enable the module on i.MX,
+ * - but clear I2CR_IEN bit enable the module on Vybrid.
+ */
+#define I2SR_CLR_OPCODE_W0C 0x0
+#define I2SR_CLR_OPCODE_W1C (I2SR_IAL | I2SR_IIF)
+#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 ******************************************************************
*******************************************************************************/
@@ -242,8 +258,8 @@ 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(0, i2c_imx, IMX_I2C_I2SR);
- imx_i2c_write_reg(I2CR_IEN, i2c_imx, IMX_I2C_I2CR);
+ 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);
/* Wait controller to be stable */
udelay(50);
@@ -287,7 +303,7 @@ static void i2c_imx_stop(struct imx_i2c_struct *i2c_imx)
}
/* Disable I2C controller */
- imx_i2c_write_reg(0, i2c_imx, IMX_I2C_I2CR);
+ imx_i2c_write_reg(IMX_I2CR_IEN_OPCODE ^ I2CR_IEN, i2c_imx, IMX_I2C_I2CR);
clk_disable_unprepare(i2c_imx->clk);
}
@@ -339,6 +355,7 @@ 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);
imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2SR);
wake_up(&i2c_imx->queue);
return IRQ_HANDLED;
@@ -596,8 +613,8 @@ 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(0, i2c_imx, IMX_I2C_I2CR);
- imx_i2c_write_reg(0, i2c_imx, IMX_I2C_I2SR);
+ 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);
/* Add I2C adapter */
ret = i2c_add_numbered_adapter(&i2c_imx->adapter);