Hi,
On Sun, Nov 04, 2012 at 04:14:27PM +0530, Shubhrajyoti D wrote:
> The revision register on OMAP4 is a 16-bit lo and a 16-bit
> hi. Currently the driver reads only the lower 8-bits.
> Fix the same by preventing the truncating of the rev register
> for OMAP4.
>
> Also use the scheme bit ie bit-14 of the hi register to know if it
> is OMAP_I2C_IP_VERSION_2.
>
> On platforms previous to OMAP4 the offset 0x04 is IE register whose
> bit-14 reset value is 0, the code uses the same to its advantage.
>
> Also since the omap_i2c_read_reg uses reg_map_ip_* a raw_readw is done
> to fetch the revision register.
>
> The dev->regs is populated after reading the rev_hi. A NULL check
> has been added in the resume handler to prevent the access before
> the setting of the regs.
>
> Signed-off-by: Shubhrajyoti D <shubhrajyoti@xxxxxx>
> ---
> drivers/i2c/busses/i2c-omap.c | 61 ++++++++++++++++++++++++++++++++---------
> 1 files changed, 48 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
> index db31eae..72fce6d 100644
> --- a/drivers/i2c/busses/i2c-omap.c
> +++ b/drivers/i2c/busses/i2c-omap.c
> @@ -49,9 +49,10 @@
> #define OMAP_I2C_OMAP1_REV_2 0x20
>
> /* I2C controller revisions present on specific hardware */
> -#define OMAP_I2C_REV_ON_2430 0x36
> -#define OMAP_I2C_REV_ON_3430_3530 0x3C
> -#define OMAP_I2C_REV_ON_3630_4430 0x40
> +#define OMAP_I2C_REV_ON_2430 0x00000036
> +#define OMAP_I2C_REV_ON_3430_3530 0x0000003C
> +#define OMAP_I2C_REV_ON_3630 0x00000040
> +#define OMAP_I2C_REV_ON_4430_PLUS 0x50400002
>
> /* timeout waiting for the controller to respond */
> #define OMAP_I2C_TIMEOUT (msecs_to_jiffies(1000))
> @@ -202,7 +203,7 @@ struct omap_i2c_dev {
> * fifo_size==0 implies no fifo
> * if set, should be trsh+1
> */
> - u8 rev;
> + u32 rev;
> unsigned b_hw:1; /* bad h/w fixes */
> unsigned receiver:1; /* true when we're in receiver mode */
> u16 iestate; /* Saved interrupt register */
> @@ -490,7 +491,7 @@ static void omap_i2c_resize_fifo(struct omap_i2c_dev *dev, u8 size, bool is_rx)
>
> omap_i2c_write_reg(dev, OMAP_I2C_BUF_REG, buf);
>
> - if (dev->rev < OMAP_I2C_REV_ON_3630_4430)
> + if (dev->rev < OMAP_I2C_REV_ON_3630)
> dev->b_hw = 1; /* Enable hardware fixes */
>
> /* calculate wakeup latency constraint for MPU */
> @@ -1052,6 +1053,16 @@ static const struct of_device_id omap_i2c_of_match[] = {
> MODULE_DEVICE_TABLE(of, omap_i2c_of_match);
> #endif
>
> +#define OMAP_I2C_SCHEME(rev) ((rev & 0xc000) >> 14)
> +
> +#define OMAP_I2C_REV_SCHEME_0_MAJOR(rev) (rev >> 4)
> +#define OMAP_I2C_REV_SCHEME_0_MINOR(rev) (rev & 0xf)
> +
> +#define OMAP_I2C_REV_SCHEME_1_MAJOR(rev) ((rev & 0x0700) >> 7)
> +#define OMAP_I2C_REV_SCHEME_1_MINOR(rev) (rev & 0x1f)
> +#define OMAP_I2C_SCHEME_0 0
> +#define OMAP_I2C_SCHEME_1 1
> +
> static int __devinit
> omap_i2c_probe(struct platform_device *pdev)
> {
> @@ -1064,6 +1075,8 @@ omap_i2c_probe(struct platform_device *pdev)
> const struct of_device_id *match;
> int irq;
> int r;
> + u32 rev;
> + u16 minor, major;
>
> /* NOTE: driver uses the static register mapping */
> mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> @@ -1117,11 +1130,6 @@ omap_i2c_probe(struct platform_device *pdev)
>
> dev->reg_shift = (dev->flags >> OMAP_I2C_FLAG_BUS_SHIFT__SHIFT) & 3;
>
> - if (dev->dtrev == OMAP_I2C_IP_VERSION_2)
> - dev->regs = (u8 *)reg_map_ip_v2;
> - else
> - dev->regs = (u8 *)reg_map_ip_v1;
> -
> pm_runtime_enable(dev->dev);
> pm_runtime_set_autosuspend_delay(dev->dev, OMAP_I2C_PM_TIMEOUT);
> pm_runtime_use_autosuspend(dev->dev);
> @@ -1130,7 +1138,31 @@ omap_i2c_probe(struct platform_device *pdev)
> if (IS_ERR_VALUE(r))
> goto err_free_mem;
>
> - dev->rev = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) & 0xff;
> + /*
> + * Read the Rev hi bit-[15:14] ie scheme this is 1 indicates ver2.
> + * On omap3 Offset 4 is IE Reg the bit [15:14] is XDR_IE which is 0
comment is wrong. You talk about 2 bits and document only one of them.
Also, this is valid for all OMAPs until OMAP3, comment should probably
read: On OMAP1/2/3 offset 0x04 is.....
> + * at reset. Also since the omap_i2c_read_reg uses reg_map_ip_* a
> + * raw_readw is done.
> + */
> + rev = __raw_readw(dev->base + 0x04);
> +
> + switch (OMAP_I2C_SCHEME(rev)) {
> + case OMAP_I2C_SCHEME_0:
> + dev->regs = (u8 *)reg_map_ip_v1;
> + dev->rev = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) & 0xff;
drop the 0xff. Top byte is supposed to be zero and if it's not, we want
to know what they hold.
> + minor = OMAP_I2C_REV_SCHEME_0_MAJOR(dev->rev);
> + major = OMAP_I2C_REV_SCHEME_0_MAJOR(dev->rev);
> + break;
> + case OMAP_I2C_SCHEME_1:
> + /* FALLTHROUGH */
> + default:
> + dev->regs = (u8 *)reg_map_ip_v2;
> + rev = (rev << 16) |
> + omap_i2c_read_reg(dev, OMAP_I2C_IP_V2_REVNB_LO);
> + minor = OMAP_I2C_REV_SCHEME_1_MINOR(rev);
> + major = OMAP_I2C_REV_SCHEME_1_MAJOR(rev);
> + dev->rev = rev;
> + }
>
> dev->errata = 0;
>
> @@ -1155,7 +1187,7 @@ omap_i2c_probe(struct platform_device *pdev)
>
> dev->fifo_size = (dev->fifo_size / 2);
>
> - if (dev->rev < OMAP_I2C_REV_ON_3630_4430)
> + if (dev->rev < OMAP_I2C_REV_ON_3630)
> dev->b_hw = 1; /* Enable hardware fixes */
looks like this was applicable to 4430 too, what happened ?
--
balbi
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