On Wed, Oct 14, 2009 at 3:00 PM, <charu@xxxxxx> wrote:
> omap_mcbsp_pollwrite and omap_mcbsp_pollread functions access
> McBSP registers as 16-bit registers.
>
> The McBSP registers (DRR_REG and DXR_REG) are limited to
> 32-bit data accesses (L4 Interconnect). 16-bit and 8-bit is
> not allowed and can corrupt register content.
>
> This patch modifies omap_mcbsp_pollwrite and
> omap_mcbsp_pollread functions to do 32 bit access for above
> mentioned McBSP registers. Data accepted by these
> functions is also modified to 32-bit.
>
> Signed-off-by: Charulatha V <charu@xxxxxx>
> Signed-off-by: Syed Rafiuddin <rafiuddin.syed@xxxxxx>
> ---
> arch/arm/plat-omap/include/mach/mcbsp.h | 4 +-
> arch/arm/plat-omap/mcbsp.c | 46 ++++++++++++++-----------------
> 2 files changed, 23 insertions(+), 27 deletions(-)
>
> diff --git a/arch/arm/plat-omap/include/mach/mcbsp.h b/arch/arm/plat-omap/include/mach/mcbsp.h
> index 7e9cae3..05b0d8d 100644
> --- a/arch/arm/plat-omap/include/mach/mcbsp.h
> +++ b/arch/arm/plat-omap/include/mach/mcbsp.h
> @@ -455,8 +455,8 @@ int omap_mcbsp_spi_master_recv_word_poll(unsigned int id, u32 * word);
> void omap_mcbsp_set_spi_mode(unsigned int id, const struct omap_mcbsp_spi_cfg * spi_cfg);
>
> /* Polled read/write functions */
> -int omap_mcbsp_pollread(unsigned int id, u16 * buf);
> -int omap_mcbsp_pollwrite(unsigned int id, u16 buf);
> +int omap_mcbsp_pollread(unsigned int id, u32 *buf);
> +int omap_mcbsp_pollwrite(unsigned int id, u32 buf);
> int omap_mcbsp_set_io_type(unsigned int id, omap_mcbsp_io_type_t io_type);
>
> #endif
> diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c
> index 88ac976..1f278a2 100644
> --- a/arch/arm/plat-omap/mcbsp.c
> +++ b/arch/arm/plat-omap/mcbsp.c
> @@ -613,7 +613,7 @@ void omap_mcbsp_stop(unsigned int id, int tx, int rx)
> EXPORT_SYMBOL(omap_mcbsp_stop);
>
> /* polled mcbsp i/o operations */
> -int omap_mcbsp_pollwrite(unsigned int id, u16 buf)
> +int omap_mcbsp_pollwrite(unsigned int id, u32 buf)
> {
> struct omap_mcbsp *mcbsp;
> void __iomem *base;
> @@ -626,26 +626,24 @@ int omap_mcbsp_pollwrite(unsigned int id, u16 buf)
> mcbsp = id_to_mcbsp_ptr(id);
> base = mcbsp->io_base;
>
> - writew(buf, base + OMAP_MCBSP_REG_DXR1);
> + OMAP_MCBSP_WRITE(base, DXR, buf);
> /* if frame sync error - clear the error */
> - if (readw(base + OMAP_MCBSP_REG_SPCR2) & XSYNC_ERR) {
> + if (OMAP_MCBSP_READ(base, SPCR2) & XSYNC_ERR) {
> /* clear error */
> - writew(readw(base + OMAP_MCBSP_REG_SPCR2) & (~XSYNC_ERR),
> - base + OMAP_MCBSP_REG_SPCR2);
> + OMAP_MCBSP_WRITE(base, SPCR2, OMAP_MCBSP_READ(base , SPCR2)
remove extra space: 'base ,'
checkpatch.pl should catch these kind of issues.
-vimal
> + & (~XSYNC_ERR));
> /* resend */
> return -1;
> } else {
> /* wait for transmit confirmation */
> int attemps = 0;
> - while (!(readw(base + OMAP_MCBSP_REG_SPCR2) & XRDY)) {
> + while (!(OMAP_MCBSP_READ(base, SPCR2) & XRDY)) {
> if (attemps++ > 1000) {
> - writew(readw(base + OMAP_MCBSP_REG_SPCR2) &
> - (~XRST),
> - base + OMAP_MCBSP_REG_SPCR2);
> + OMAP_MCBSP_WRITE(base, SPCR2,
> + OMAP_MCBSP_READ(base, SPCR2) & (~XRST));
> udelay(10);
> - writew(readw(base + OMAP_MCBSP_REG_SPCR2) |
> - (XRST),
> - base + OMAP_MCBSP_REG_SPCR2);
> + OMAP_MCBSP_WRITE(base, SPCR2,
> + OMAP_MCBSP_READ(base, SPCR2) | (XRST));
> udelay(10);
> dev_err(mcbsp->dev, "Could not write to"
> " McBSP%d Register\n", mcbsp->id);
> @@ -658,7 +656,7 @@ int omap_mcbsp_pollwrite(unsigned int id, u16 buf)
> }
> EXPORT_SYMBOL(omap_mcbsp_pollwrite);
>
> -int omap_mcbsp_pollread(unsigned int id, u16 *buf)
> +int omap_mcbsp_pollread(unsigned int id, u32 *buf)
> {
> struct omap_mcbsp *mcbsp;
> void __iomem *base;
> @@ -671,24 +669,22 @@ int omap_mcbsp_pollread(unsigned int id, u16 *buf)
>
> base = mcbsp->io_base;
> /* if frame sync error - clear the error */
> - if (readw(base + OMAP_MCBSP_REG_SPCR1) & RSYNC_ERR) {
> + if (OMAP_MCBSP_READ(base, SPCR1) & RSYNC_ERR) {
> /* clear error */
> - writew(readw(base + OMAP_MCBSP_REG_SPCR1) & (~RSYNC_ERR),
> - base + OMAP_MCBSP_REG_SPCR1);
> + OMAP_MCBSP_WRITE(base, SPCR1, OMAP_MCBSP_READ(base, SPCR1)
> + & (~RSYNC_ERR));
> /* resend */
> return -1;
> } else {
> /* wait for recieve confirmation */
> int attemps = 0;
> - while (!(readw(base + OMAP_MCBSP_REG_SPCR1) & RRDY)) {
> - if (attemps++ > 1000) {
> - writew(readw(base + OMAP_MCBSP_REG_SPCR1) &
> - (~RRST),
> - base + OMAP_MCBSP_REG_SPCR1);
> + while (!(OMAP_MCBSP_READ(base, SPCR1) & RRDY)) {
> + if (attemps++ > 10000) {
> + OMAP_MCBSP_WRITE(base, SPCR1,
> + OMAP_MCBSP_READ(base, SPCR1) & (~RRST));
> udelay(10);
> - writew(readw(base + OMAP_MCBSP_REG_SPCR1) |
> - (RRST),
> - base + OMAP_MCBSP_REG_SPCR1);
> + OMAP_MCBSP_WRITE(base, SPCR1,
> + OMAP_MCBSP_READ(base, SPCR1) | (RRST));
> udelay(10);
> dev_err(mcbsp->dev, "Could not read from"
> " McBSP%d Register\n", mcbsp->id);
> @@ -696,7 +692,7 @@ int omap_mcbsp_pollread(unsigned int id, u16 *buf)
> }
> }
> }
> - *buf = readw(base + OMAP_MCBSP_REG_DRR1);
> + *buf = OMAP_MCBSP_READ(base, DRR);
>
> return 0;
> }
> --
> 1.6.0.4
>
> --
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--
Regards,
Vimal Singh
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