diff options
Diffstat (limited to 'arch/arm/mach-pxa')
| -rw-r--r-- | arch/arm/mach-pxa/corgi_ssp.c | 20 | ||||
| -rw-r--r-- | arch/arm/mach-pxa/ssp.c | 35 |
2 files changed, 40 insertions, 15 deletions
diff --git a/arch/arm/mach-pxa/corgi_ssp.c b/arch/arm/mach-pxa/corgi_ssp.c index f9421318cb7a..ff6b4ee037f5 100644 --- a/arch/arm/mach-pxa/corgi_ssp.c +++ b/arch/arm/mach-pxa/corgi_ssp.c @@ -47,14 +47,15 @@ static struct corgissp_machinfo *ssp_machinfo; */ unsigned long corgi_ssp_ads7846_putget(ulong data) { - unsigned long ret,flag; + unsigned long flag; + u32 ret = 0; spin_lock_irqsave(&corgi_ssp_lock, flag); if (ssp_machinfo->cs_ads7846 >= 0) GPCR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846); ssp_write_word(&corgi_ssp_dev,data); - ret = ssp_read_word(&corgi_ssp_dev); + ssp_read_word(&corgi_ssp_dev, &ret); if (ssp_machinfo->cs_ads7846 >= 0) GPSR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846); @@ -88,7 +89,9 @@ void corgi_ssp_ads7846_put(ulong data) unsigned long corgi_ssp_ads7846_get(void) { - return ssp_read_word(&corgi_ssp_dev); + u32 ret = 0; + ssp_read_word(&corgi_ssp_dev, &ret); + return ret; } EXPORT_SYMBOL(corgi_ssp_ads7846_putget); @@ -104,6 +107,7 @@ EXPORT_SYMBOL(corgi_ssp_ads7846_get); unsigned long corgi_ssp_dac_put(ulong data) { unsigned long flag, sscr1 = SSCR1_SPH; + u32 tmp; spin_lock_irqsave(&corgi_ssp_lock, flag); @@ -118,7 +122,7 @@ unsigned long corgi_ssp_dac_put(ulong data) GPCR(ssp_machinfo->cs_lcdcon) = GPIO_bit(ssp_machinfo->cs_lcdcon); ssp_write_word(&corgi_ssp_dev,data); /* Read null data back from device to prevent SSP overflow */ - ssp_read_word(&corgi_ssp_dev); + ssp_read_word(&corgi_ssp_dev, &tmp); if (ssp_machinfo->cs_lcdcon >= 0) GPSR(ssp_machinfo->cs_lcdcon) = GPIO_bit(ssp_machinfo->cs_lcdcon); @@ -150,7 +154,7 @@ EXPORT_SYMBOL(corgi_ssp_blduty_set); int corgi_ssp_max1111_get(ulong data) { unsigned long flag; - int voltage,voltage1,voltage2; + long voltage = 0, voltage1 = 0, voltage2 = 0; spin_lock_irqsave(&corgi_ssp_lock, flag); if (ssp_machinfo->cs_max1111 >= 0) @@ -163,15 +167,15 @@ int corgi_ssp_max1111_get(ulong data) /* TB1/RB1 */ ssp_write_word(&corgi_ssp_dev,data); - ssp_read_word(&corgi_ssp_dev); /* null read */ + ssp_read_word(&corgi_ssp_dev, (u32*)&voltage1); /* null read */ /* TB12/RB2 */ ssp_write_word(&corgi_ssp_dev,0); - voltage1=ssp_read_word(&corgi_ssp_dev); + ssp_read_word(&corgi_ssp_dev, (u32*)&voltage1); /* TB13/RB3*/ ssp_write_word(&corgi_ssp_dev,0); - voltage2=ssp_read_word(&corgi_ssp_dev); + ssp_read_word(&corgi_ssp_dev, (u32*)&voltage2); ssp_disable(&corgi_ssp_dev); ssp_config(&corgi_ssp_dev, (SSCR0_National | (SSCR0_DSS & 0x0b )), 0, 0, SSCR0_SerClkDiv(ssp_machinfo->clk_ads7846)); diff --git a/arch/arm/mach-pxa/ssp.c b/arch/arm/mach-pxa/ssp.c index 93096befd017..1fddfeaa630d 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; } /** |
