diff options
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/mxc_i2c.c | 72 |
1 files changed, 44 insertions, 28 deletions
diff --git a/drivers/i2c/mxc_i2c.c b/drivers/i2c/mxc_i2c.c index 7f669ff539..fd6db18558 100644 --- a/drivers/i2c/mxc_i2c.c +++ b/drivers/i2c/mxc_i2c.c @@ -23,6 +23,7 @@ */ #include <common.h> +#include <asm/io.h> #if defined(CONFIG_HARD_I2C) @@ -81,15 +82,26 @@ static u16 div[] = { 30, 32, 36, 42, 48, 52, 60, 72, 80, 88, 104, 128, 144, 160, 192, 240, 288, 320, 384, 480, 576, 640, 768, 960, 1152, 1280, 1536, 1920, 2304, 2560, 3072, 3840}; +static inline void i2c_reset(void) +{ + writew(0, I2C_BASE + I2CR); /* Reset module */ + writew(0, I2C_BASE + I2SR); + writew(I2CR_IEN, I2C_BASE + I2CR); +} + void i2c_init(int speed, int unused) { int freq; int i; #if defined(CONFIG_MX31) + struct clock_control_regs *sc_regs = + (struct clock_control_regs *)CCM_BASE; + freq = mx31_get_ipg_clk(); /* start the required I2C clock */ - __REG(CCM_CGR0) = __REG(CCM_CGR0) | (3 << I2C_CLK_OFFSET); + writel(readl(&sc_regs->cgr0) | (3 << I2C_CLK_OFFSET), + &sc_regs->cgr0); #else freq = mxc_get_clock(MXC_IPG_PERCLK); #endif @@ -98,30 +110,28 @@ void i2c_init(int speed, int unused) if (freq / div[i] <= speed) break; - DPRINTF("%s: speed: %d\n",__FUNCTION__, speed); + debug("%s: speed: %d\n", __func__, speed); - __REG16(I2C_BASE + I2CR) = 0; /* Reset module */ - __REG16(I2C_BASE + IFDR) = i; - __REG16(I2C_BASE + I2CR) = I2CR_IEN; - __REG16(I2C_BASE + I2SR) = 0; + writew(i, I2C_BASE + IFDR); + i2c_reset(); } static int wait_busy(void) { int timeout = 10000; - while (!(__REG16(I2C_BASE + I2SR) & I2SR_IIF) && --timeout) + while (!(readw(I2C_BASE + I2SR) & I2SR_IIF) && --timeout) udelay(1); - __REG16(I2C_BASE + I2SR) = 0; /* clear interrupt */ + writew(0, I2C_BASE + I2SR); /* clear interrupt */ return timeout; } static int tx_byte(u8 byte) { - __REG16(I2C_BASE + I2DR) = byte; + writew(byte, I2C_BASE + I2DR); - if (!wait_busy() || __REG16(I2C_BASE + I2SR) & I2SR_RX_NO_AK) + if (!wait_busy() || readw(I2C_BASE + I2SR) & I2SR_RX_NO_AK) return -1; return 0; } @@ -131,27 +141,27 @@ static int rx_byte(void) if (!wait_busy()) return -1; - return __REG16(I2C_BASE + I2DR); + return readw(I2C_BASE + I2DR); } int i2c_probe(uchar chip) { int ret; - __REG16(I2C_BASE + I2CR) = 0; /* Reset module */ - __REG16(I2C_BASE + I2CR) = I2CR_IEN; + writew(0, I2C_BASE + I2CR); /* Reset module */ + writew(I2CR_IEN, I2C_BASE + I2CR); - __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MSTA | I2CR_MTX; + writew(I2CR_IEN | I2CR_MSTA | I2CR_MTX, I2C_BASE + I2CR); ret = tx_byte(chip << 1); - __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MTX; + writew(I2CR_IEN | I2CR_MTX, I2C_BASE + I2CR); return ret; } static int i2c_addr(uchar chip, uint addr, int alen) { - __REG16(I2C_BASE + I2SR) = 0; /* clear interrupt */ - __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MSTA | I2CR_MTX; + writew(0, I2C_BASE + I2SR); + writew(I2CR_IEN | I2CR_MSTA | I2CR_MTX, I2C_BASE + I2CR); if (tx_byte(chip << 1)) return -1; @@ -167,35 +177,40 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len) int timeout = 10000; int ret; - DPRINTF("%s chip: 0x%02x addr: 0x%04x alen: %d len: %d\n",__FUNCTION__, chip, addr, alen, len); + debug("%s chip: 0x%02x addr: 0x%04x alen: %d len: %d\n", + __func__, chip, addr, alen, len); if (i2c_addr(chip, addr, alen)) { printf("i2c_addr failed\n"); return -1; } - __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MSTA | I2CR_MTX | I2CR_RSTA; + writew(I2CR_IEN | I2CR_MSTA | I2CR_MTX | I2CR_RSTA, I2C_BASE + I2CR); if (tx_byte(chip << 1 | 1)) return -1; - __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MSTA | ((len == 1) ? I2CR_TX_NO_AK : 0); + writew(I2CR_IEN | I2CR_MSTA | + ((len == 1) ? I2CR_TX_NO_AK : 0), + I2C_BASE + I2CR); - ret = __REG16(I2C_BASE + I2DR); + ret = readw(I2C_BASE + I2DR); while (len--) { if ((ret = rx_byte()) < 0) return -1; *buf++ = ret; if (len <= 1) - __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MSTA | I2CR_TX_NO_AK; + writew(I2CR_IEN | I2CR_MSTA | + I2CR_TX_NO_AK, + I2C_BASE + I2CR); } wait_busy(); - __REG16(I2C_BASE + I2CR) = I2CR_IEN; + writew(I2CR_IEN, I2C_BASE + I2CR); - while (__REG16(I2C_BASE + I2SR) & I2SR_IBB && --timeout) + while (readw(I2C_BASE + I2SR) & I2SR_IBB && --timeout) udelay(1); return 0; @@ -203,8 +218,9 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len) int i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len) { - int timeout = 10000; - DPRINTF("%s chip: 0x%02x addr: 0x%04x alen: %d len: %d\n",__FUNCTION__, chip, addr, alen, len); + int timeout = I2C_MAX_TIMEOUT; + debug("%s chip: 0x%02x addr: 0x%04x alen: %d len: %d\n", + __func__, chip, addr, alen, len); if (i2c_addr(chip, addr, alen)) return -1; @@ -213,9 +229,9 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len) if (tx_byte(*buf++)) return -1; - __REG16(I2C_BASE + I2CR) = I2CR_IEN; + writew(I2CR_IEN, I2C_BASE + I2CR); - while (__REG16(I2C_BASE + I2SR) & I2SR_IBB && --timeout) + while (readw(I2C_BASE + I2SR) & I2SR_IBB && --timeout) udelay(1); return 0; |