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i2c: omap: Add support for 16-bit registers

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The current i2c-omap driver is set up for 32-bit registers, which
corresponds to most OMAP devices.  However, OMAP730/850 based
devices use a 16-bit register size.

This change modifies the driver to perform a runtime CPU type check
to determine the register sizes, and uses a bit shift of either 1
or 2 bits to compute the proper register sizes for all registers.

Signed-off-by: Cory Maccarrone <darkstar6262@gmail.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
This commit is contained in:
Cory Maccarrone 2009-12-12 17:54:02 -08:00 committed by Ben Dooks
parent 96eb7164e3
commit d84d3ea317
1 changed files with 25 additions and 19 deletions
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44
drivers/i2c/busses/i2c-omap.c
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@ -49,24 +49,24 @@
#define OMAP_I2C_TIMEOUT (msecs_to_jiffies(1000))
#define OMAP_I2C_REV_REG 0x00
#define OMAP_I2C_IE_REG 0x04
#define OMAP_I2C_STAT_REG 0x08
#define OMAP_I2C_IV_REG 0x0c
#define OMAP_I2C_IE_REG 0x01
#define OMAP_I2C_STAT_REG 0x02
#define OMAP_I2C_IV_REG 0x03
/* For OMAP3 I2C_IV has changed to I2C_WE (wakeup enable) */
#define OMAP_I2C_WE_REG 0x0c
#define OMAP_I2C_SYSS_REG 0x10
#define OMAP_I2C_BUF_REG 0x14
#define OMAP_I2C_CNT_REG 0x18
#define OMAP_I2C_DATA_REG 0x1c
#define OMAP_I2C_SYSC_REG 0x20
#define OMAP_I2C_CON_REG 0x24
#define OMAP_I2C_OA_REG 0x28
#define OMAP_I2C_SA_REG 0x2c
#define OMAP_I2C_PSC_REG 0x30
#define OMAP_I2C_SCLL_REG 0x34
#define OMAP_I2C_SCLH_REG 0x38
#define OMAP_I2C_SYSTEST_REG 0x3c
#define OMAP_I2C_BUFSTAT_REG 0x40
#define OMAP_I2C_WE_REG 0x03
#define OMAP_I2C_SYSS_REG 0x04
#define OMAP_I2C_BUF_REG 0x05
#define OMAP_I2C_CNT_REG 0x06
#define OMAP_I2C_DATA_REG 0x07
#define OMAP_I2C_SYSC_REG 0x08
#define OMAP_I2C_CON_REG 0x09
#define OMAP_I2C_OA_REG 0x0a
#define OMAP_I2C_SA_REG 0x0b
#define OMAP_I2C_PSC_REG 0x0c
#define OMAP_I2C_SCLL_REG 0x0d
#define OMAP_I2C_SCLH_REG 0x0e
#define OMAP_I2C_SYSTEST_REG 0x0f
#define OMAP_I2C_BUFSTAT_REG 0x10
/* I2C Interrupt Enable Register (OMAP_I2C_IE): */
#define OMAP_I2C_IE_XDR (1 << 14) /* TX Buffer drain int enable */
@ -161,6 +161,7 @@ struct omap_i2c_dev {
struct device *dev;
void __iomem *base; /* virtual */
int irq;
int reg_shift; /* bit shift for I2C register addresses */
struct clk *iclk; /* Interface clock */
struct clk *fclk; /* Functional clock */
struct completion cmd_complete;
@ -189,12 +190,12 @@ struct omap_i2c_dev {
static inline void omap_i2c_write_reg(struct omap_i2c_dev *i2c_dev,
int reg, u16 val)
{
__raw_writew(val, i2c_dev->base + reg);
__raw_writew(val, i2c_dev->base + (reg << i2c_dev->reg_shift));
}
static inline u16 omap_i2c_read_reg(struct omap_i2c_dev *i2c_dev, int reg)
{
return __raw_readw(i2c_dev->base + reg);
return __raw_readw(i2c_dev->base + (reg << i2c_dev->reg_shift));
}
static int __init omap_i2c_get_clocks(struct omap_i2c_dev *dev)
@ -924,6 +925,11 @@ omap_i2c_probe(struct platform_device *pdev)
dev->b_hw = 1; /* Enable hardware fixes */
}
if (cpu_is_omap7xx())
dev->reg_shift = 1;
else
dev->reg_shift = 2;
/* reset ASAP, clearing any IRQs */
omap_i2c_init(dev);