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| author | Jeff Garzik <jeff@garzik.org> | 2006-09-04 06:41:37 -0400 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2006-09-04 06:41:37 -0400 |
| commit | f9bcda7760e1373615c9f6d9ce24209b0ab97de1 (patch) | |
| tree | f90b3031126c4e4beb8161f38ea436303e2b8b73 /arch/arm/mach-pxa/ssp.c | |
| parent | 9bec2e38527a9f2497b3d976715c672d08d6160d (diff) | |
| parent | c336923b668fdcf0312efbec3b44895d713f4d81 (diff) | |
Merge branch 'master' into upstream
Diffstat (limited to 'arch/arm/mach-pxa/ssp.c')
| -rw-r--r-- | arch/arm/mach-pxa/ssp.c | 35 |
1 files changed, 28 insertions, 7 deletions
diff --git a/arch/arm/mach-pxa/ssp.c b/arch/arm/mach-pxa/ssp.c index 93096befd01..1fddfeaa630 100644 --- a/arch/arm/mach-pxa/ssp.c +++ b/arch/arm/mach-pxa/ssp.c @@ -40,6 +40,8 @@ #define PXA_SSP_PORTS 3 +#define TIMEOUT 100000 + struct ssp_info_ { int irq; u32 clock; @@ -92,13 +94,18 @@ static irqreturn_t ssp_interrupt(int irq, void *dev_id, struct pt_regs *regs) * The caller is expected to perform the necessary locking. * * Returns: - * %-ETIMEDOUT timeout occurred (for future) + * %-ETIMEDOUT timeout occurred * 0 success */ int ssp_write_word(struct ssp_dev *dev, u32 data) { - while (!(SSSR_P(dev->port) & SSSR_TNF)) + int timeout = TIMEOUT; + + while (!(SSSR_P(dev->port) & SSSR_TNF)) { + if (!--timeout) + return -ETIMEDOUT; cpu_relax(); + } SSDR_P(dev->port) = data; @@ -117,15 +124,21 @@ int ssp_write_word(struct ssp_dev *dev, u32 data) * The caller is expected to perform the necessary locking. * * Returns: - * %-ETIMEDOUT timeout occurred (for future) + * %-ETIMEDOUT timeout occurred * 32-bit data success */ -int ssp_read_word(struct ssp_dev *dev) +int ssp_read_word(struct ssp_dev *dev, u32 *data) { - while (!(SSSR_P(dev->port) & SSSR_RNE)) + int timeout = TIMEOUT; + + while (!(SSSR_P(dev->port) & SSSR_RNE)) { + if (!--timeout) + return -ETIMEDOUT; cpu_relax(); + } - return SSDR_P(dev->port); + *data = SSDR_P(dev->port); + return 0; } /** @@ -136,13 +149,21 @@ int ssp_read_word(struct ssp_dev *dev) * * The caller is expected to perform the necessary locking. */ -void ssp_flush(struct ssp_dev *dev) +int ssp_flush(struct ssp_dev *dev) { + int timeout = TIMEOUT * 2; + do { while (SSSR_P(dev->port) & SSSR_RNE) { + if (!--timeout) + return -ETIMEDOUT; (void) SSDR_P(dev->port); } + if (!--timeout) + return -ETIMEDOUT; } while (SSSR_P(dev->port) & SSSR_BSY); + + return 0; } /** |