diff options
Diffstat (limited to 'arch/arm/cpu/pxa/i2c.c')
| -rw-r--r-- | arch/arm/cpu/pxa/i2c.c | 69 |
1 files changed, 40 insertions, 29 deletions
diff --git a/arch/arm/cpu/pxa/i2c.c b/arch/arm/cpu/pxa/i2c.c index 6b72ba13a..7aa49ae4a 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; |