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Diffstat (limited to 'arch/arm/cpu/pxa/i2c.c')
-rw-r--r--arch/arm/cpu/pxa/i2c.c69
1 files changed, 40 insertions, 29 deletions
diff --git a/arch/arm/cpu/pxa/i2c.c b/arch/arm/cpu/pxa/i2c.c
index 6b72ba1..7aa49ae 100644
--- a/arch/arm/cpu/pxa/i2c.c
+++ b/arch/arm/cpu/pxa/i2c.c
@@ -33,6 +33,7 @@
/* FIXME: this file is PXA255 specific! What about other XScales? */
#include <common.h>
+#include <asm/io.h>
#ifdef CONFIG_HARD_I2C
@@ -93,19 +94,21 @@ struct i2c_msg {
static void i2c_reset( void )
{
- ICR &= ~ICR_IUE; /* disable unit */
- ICR |= ICR_UR; /* reset the unit */
+ writel(readl(ICR) & ~ICR_IUE, ICR); /* disable unit */
+ writel(readl(ICR) | ICR_UR, ICR); /* reset the unit */
udelay(100);
- ICR &= ~ICR_IUE; /* disable unit */
+ writel(readl(ICR) & ~ICR_IUE, ICR); /* disable unit */
#ifdef CONFIG_CPU_MONAHANS
- CKENB |= (CKENB_4_I2C); /* | CKENB_1_PWM1 | CKENB_0_PWM0); */
+ /* | CKENB_1_PWM1 | CKENB_0_PWM0); */
+ writel(readl(CKENB) | (CKENB_4_I2C), CKENB);
#else /* CONFIG_CPU_MONAHANS */
- CKEN |= CKEN14_I2C; /* set the global I2C clock on */
+ /* set the global I2C clock on */
+ writel(readl(CKEN) | CKEN14_I2C, CKEN);
#endif
- ISAR = I2C_PXA_SLAVE_ADDR; /* set our slave address */
- ICR = I2C_ICR_INIT; /* set control register values */
- ISR = I2C_ISR_INIT; /* set clear interrupt bits */
- ICR |= ICR_IUE; /* enable unit */
+ writel(I2C_PXA_SLAVE_ADDR, ISAR); /* set our slave address */
+ writel(I2C_ICR_INIT, ICR); /* set control reg values */
+ writel(I2C_ISR_INIT, ISR); /* set clear interrupt bits */
+ writel(readl(ICR) | ICR_IUE, ICR); /* enable unit */
udelay(100);
}
@@ -159,22 +162,26 @@ int i2c_transfer(struct i2c_msg *msg)
goto transfer_error_bus_busy;
/* start transmission */
- ICR &= ~ICR_START;
- ICR &= ~ICR_STOP;
- IDBR = msg->data;
- if (msg->condition == I2C_COND_START) ICR |= ICR_START;
- if (msg->condition == I2C_COND_STOP) ICR |= ICR_STOP;
- if (msg->acknack == I2C_ACKNAK_SENDNAK) ICR |= ICR_ACKNAK;
- if (msg->acknack == I2C_ACKNAK_SENDACK) ICR &= ~ICR_ACKNAK;
- ICR &= ~ICR_ALDIE;
- ICR |= ICR_TB;
+ writel(readl(ICR) & ~ICR_START, ICR);
+ writel(readl(ICR) & ~ICR_STOP, ICR);
+ writel(msg->data, IDBR);
+ if (msg->condition == I2C_COND_START)
+ writel(readl(ICR) | ICR_START, ICR);
+ if (msg->condition == I2C_COND_STOP)
+ writel(readl(ICR) | ICR_STOP, ICR);
+ if (msg->acknack == I2C_ACKNAK_SENDNAK)
+ writel(readl(ICR) | ICR_ACKNAK, ICR);
+ if (msg->acknack == I2C_ACKNAK_SENDACK)
+ writel(readl(ICR) & ~ICR_ACKNAK, ICR);
+ writel(readl(ICR) & ~ICR_ALDIE, ICR);
+ writel(readl(ICR) | ICR_TB, ICR);
/* transmit register empty? */
if (!i2c_isr_set_cleared(ISR_ITE,0))
goto transfer_error_transmit_timeout;
/* clear 'transmit empty' state */
- ISR |= ISR_ITE;
+ writel(readl(ISR) | ISR_ITE, ISR);
/* wait for ACK from slave */
if (msg->acknack == I2C_ACKNAK_WAITACK)
@@ -189,23 +196,27 @@ int i2c_transfer(struct i2c_msg *msg)
goto transfer_error_bus_busy;
/* start receive */
- ICR &= ~ICR_START;
- ICR &= ~ICR_STOP;
- if (msg->condition == I2C_COND_START) ICR |= ICR_START;
- if (msg->condition == I2C_COND_STOP) ICR |= ICR_STOP;
- if (msg->acknack == I2C_ACKNAK_SENDNAK) ICR |= ICR_ACKNAK;
- if (msg->acknack == I2C_ACKNAK_SENDACK) ICR &= ~ICR_ACKNAK;
- ICR &= ~ICR_ALDIE;
- ICR |= ICR_TB;
+ writel(readl(ICR) & ~ICR_START, ICR);
+ writel(readl(ICR) & ~ICR_STOP, ICR);
+ if (msg->condition == I2C_COND_START)
+ writel(readl(ICR) | ICR_START, ICR);
+ if (msg->condition == I2C_COND_STOP)
+ writel(readl(ICR) | ICR_STOP, ICR);
+ if (msg->acknack == I2C_ACKNAK_SENDNAK)
+ writel(readl(ICR) | ICR_ACKNAK, ICR);
+ if (msg->acknack == I2C_ACKNAK_SENDACK)
+ writel(readl(ICR) & ~ICR_ACKNAK, ICR);
+ writel(readl(ICR) & ~ICR_ALDIE, ICR);
+ writel(readl(ICR) | ICR_TB, ICR);
/* receive register full? */
if (!i2c_isr_set_cleared(ISR_IRF,0))
goto transfer_error_receive_timeout;
- msg->data = IDBR;
+ msg->data = readl(IDBR);
/* clear 'receive empty' state */
- ISR |= ISR_IRF;
+ writel(readl(ISR) | ISR_IRF, ISR);
break;