diff options
Diffstat (limited to 'drivers/i2c/mxc_i2c.c')
| -rw-r--r-- | drivers/i2c/mxc_i2c.c | 207 |
1 files changed, 0 insertions, 207 deletions
diff --git a/drivers/i2c/mxc_i2c.c b/drivers/i2c/mxc_i2c.c deleted file mode 100644 index 3c2a9cf..0000000 --- a/drivers/i2c/mxc_i2c.c +++ /dev/null @@ -1,207 +0,0 @@ -/* - * i2c driver for Freescale mx31 - * - * (c) 2007 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de> - * - * See file CREDITS for list of people who contributed to this - * project. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation; either version 2 of - * the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, - * MA 02111-1307 USA - */ - -#include <common.h> - -#if defined(CONFIG_HARD_I2C) && defined(CONFIG_I2C_MXC) - -#include <asm/arch/mx31.h> -#include <asm/arch/mx31-regs.h> - -#define IADR 0x00 -#define IFDR 0x04 -#define I2CR 0x08 -#define I2SR 0x0c -#define I2DR 0x10 - -#define I2CR_IEN (1 << 7) -#define I2CR_IIEN (1 << 6) -#define I2CR_MSTA (1 << 5) -#define I2CR_MTX (1 << 4) -#define I2CR_TX_NO_AK (1 << 3) -#define I2CR_RSTA (1 << 2) - -#define I2SR_ICF (1 << 7) -#define I2SR_IBB (1 << 5) -#define I2SR_IIF (1 << 1) -#define I2SR_RX_NO_AK (1 << 0) - -#ifdef CFG_I2C_MX31_PORT1 -#define I2C_BASE 0x43f80000 -#elif defined(CFG_I2C_MX31_PORT2) -#define I2C_BASE 0x43f98000 -#elif defined(CFG_I2C_MX31_PORT3) -#define I2C_BASE 0x43f84000 -#else -#error "define CFG_I2C_MX31_PORTx to use the mx31 I2C driver" -#endif - -#ifdef DEBUG -#define DPRINTF(args...) printf(args) -#else -#define DPRINTF(args...) -#endif - -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}; - -void i2c_init(int speed, int unused) -{ - int freq = mx31_get_ipg_clk(); - int i; - - for (i = 0; i < 0x1f; i++) - if (freq / div[i] <= speed) - break; - - DPRINTF("%s: speed: %d\n", __FUNCTION__, speed); - - __REG16(I2C_BASE + I2CR) = 0; /* Reset module */ - __REG16(I2C_BASE + IFDR) = i; - __REG16(I2C_BASE + I2CR) = I2CR_IEN; - __REG16(I2C_BASE + I2SR) = 0; -} - -static int wait_busy(void) -{ - int timeout = 10000; - - while (!(__REG16(I2C_BASE + I2SR) & I2SR_IIF) && --timeout) - udelay(1); - __REG16(I2C_BASE + I2SR) = 0; /* clear interrupt */ - - return timeout; -} - -static int tx_byte(u8 byte) -{ - __REG16(I2C_BASE + I2DR) = byte; - - if (!wait_busy() || __REG16(I2C_BASE + I2SR) & I2SR_RX_NO_AK) - return -1; - return 0; -} - -static int rx_byte(void) -{ - if (!wait_busy()) - return -1; - - return __REG16(I2C_BASE + I2DR); -} - -int i2c_probe(uchar chip) -{ - int ret; - - __REG16(I2C_BASE + I2CR) = 0; /* Reset module */ - __REG16(I2C_BASE + I2CR) = I2CR_IEN; - - __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MSTA | I2CR_MTX; - ret = tx_byte(chip << 1); - __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MTX; - - 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; - - if (tx_byte(chip << 1)) - return -1; - - while (alen--) - if (tx_byte((addr >> (alen * 8)) & 0xff)) - return -1; - return 0; -} - -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); - - 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; - - if (tx_byte(chip << 1 | 1)) - return -1; - - __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MSTA | ((len == 1) \ - ? I2CR_TX_NO_AK : 0); - - ret = __REG16(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; - } - - wait_busy(); - - __REG16(I2C_BASE + I2CR) = I2CR_IEN; - - while (__REG16(I2C_BASE + I2SR) & I2SR_IBB && --timeout) - udelay(1); - - return 0; -} - -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); - - if (i2c_addr(chip, addr, alen)) - return -1; - - while (len--) - if (tx_byte(*buf++)) - return -1; - - __REG16(I2C_BASE + I2CR) = I2CR_IEN; - - while (__REG16(I2C_BASE + I2SR) & I2SR_IBB && --timeout) - udelay(1); - - return 0; -} - -#endif /* CONFIG_HARD_I2C */ |