X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=drivers%2Fi2c%2Fmxc_i2c.c;h=06ba4e39f1f5ef40f3589e87f75dae3e98fc5481;hb=c2120fbfbc4d1f6953228f86be8bdbf38bacfdab;hp=1f6ba1f390c56d2c926bf02b376ac50a76ec20e1;hpb=d3c23a790fb24f9cb5cc467b81b0c3ad3eeb1f96;p=platform%2Fkernel%2Fu-boot.git diff --git a/drivers/i2c/mxc_i2c.c b/drivers/i2c/mxc_i2c.c index 1f6ba1f..06ba4e3 100644 --- a/drivers/i2c/mxc_i2c.c +++ b/drivers/i2c/mxc_i2c.c @@ -1,41 +1,45 @@ /* - * i2c driver for Freescale mx31 + * i2c driver for Freescale i.MX series * * (c) 2007 Pengutronix, Sascha Hauer + * (c) 2011 Marek Vasut * - * See file CREDITS for list of people who contributed to this - * project. + * Based on i2c-imx.c from linux kernel: + * Copyright (C) 2005 Torsten Koschorrek + * Copyright (C) 2005 Matthias Blaschke + * Copyright (C) 2007 RightHand Technologies, Inc. + * Copyright (C) 2008 Darius Augulis * - * 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 + * SPDX-License-Identifier: GPL-2.0+ */ #include +#include +#include +#include +#include +#include +#include + +#ifdef I2C_QUIRK_REG +struct mxc_i2c_regs { + uint8_t iadr; + uint8_t ifdr; + uint8_t i2cr; + uint8_t i2sr; + uint8_t i2dr; +}; +#else +struct mxc_i2c_regs { + uint32_t iadr; + uint32_t ifdr; + uint32_t i2cr; + uint32_t i2sr; + uint32_t i2dr; +}; +#endif -#if defined(CONFIG_HARD_I2C) - -#include -#include - -#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) @@ -44,159 +48,485 @@ #define I2SR_ICF (1 << 7) #define I2SR_IBB (1 << 5) +#define I2SR_IAL (1 << 4) #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 +#ifdef I2C_QUIRK_REG +#define I2CR_IEN (0 << 7) +#define I2CR_IDIS (1 << 7) +#define I2SR_IIF_CLEAR (1 << 1) #else -#error "define CFG_I2C_MX31_PORTx to use the mx31 I2C driver" +#define I2CR_IEN (1 << 7) +#define I2CR_IDIS (0 << 7) +#define I2SR_IIF_CLEAR (0 << 1) #endif -#ifdef DEBUG -#define DPRINTF(args...) printf(args) -#else -#define DPRINTF(args...) +#if defined(CONFIG_HARD_I2C) && !defined(CONFIG_SYS_I2C_BASE) +#error "define CONFIG_SYS_I2C_BASE to use the mxc_i2c driver" #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}; +#ifdef I2C_QUIRK_REG +static u16 i2c_clk_div[60][2] = { + { 20, 0x00 }, { 22, 0x01 }, { 24, 0x02 }, { 26, 0x03 }, + { 28, 0x04 }, { 30, 0x05 }, { 32, 0x09 }, { 34, 0x06 }, + { 36, 0x0A }, { 40, 0x07 }, { 44, 0x0C }, { 48, 0x0D }, + { 52, 0x43 }, { 56, 0x0E }, { 60, 0x45 }, { 64, 0x12 }, + { 68, 0x0F }, { 72, 0x13 }, { 80, 0x14 }, { 88, 0x15 }, + { 96, 0x19 }, { 104, 0x16 }, { 112, 0x1A }, { 128, 0x17 }, + { 136, 0x4F }, { 144, 0x1C }, { 160, 0x1D }, { 176, 0x55 }, + { 192, 0x1E }, { 208, 0x56 }, { 224, 0x22 }, { 228, 0x24 }, + { 240, 0x1F }, { 256, 0x23 }, { 288, 0x5C }, { 320, 0x25 }, + { 384, 0x26 }, { 448, 0x2A }, { 480, 0x27 }, { 512, 0x2B }, + { 576, 0x2C }, { 640, 0x2D }, { 768, 0x31 }, { 896, 0x32 }, + { 960, 0x2F }, { 1024, 0x33 }, { 1152, 0x34 }, { 1280, 0x35 }, + { 1536, 0x36 }, { 1792, 0x3A }, { 1920, 0x37 }, { 2048, 0x3B }, + { 2304, 0x3C }, { 2560, 0x3D }, { 3072, 0x3E }, { 3584, 0x7A }, + { 3840, 0x3F }, { 4096, 0x7B }, { 5120, 0x7D }, { 6144, 0x7E }, +}; +#else +static u16 i2c_clk_div[50][2] = { + { 22, 0x20 }, { 24, 0x21 }, { 26, 0x22 }, { 28, 0x23 }, + { 30, 0x00 }, { 32, 0x24 }, { 36, 0x25 }, { 40, 0x26 }, + { 42, 0x03 }, { 44, 0x27 }, { 48, 0x28 }, { 52, 0x05 }, + { 56, 0x29 }, { 60, 0x06 }, { 64, 0x2A }, { 72, 0x2B }, + { 80, 0x2C }, { 88, 0x09 }, { 96, 0x2D }, { 104, 0x0A }, + { 112, 0x2E }, { 128, 0x2F }, { 144, 0x0C }, { 160, 0x30 }, + { 192, 0x31 }, { 224, 0x32 }, { 240, 0x0F }, { 256, 0x33 }, + { 288, 0x10 }, { 320, 0x34 }, { 384, 0x35 }, { 448, 0x36 }, + { 480, 0x13 }, { 512, 0x37 }, { 576, 0x14 }, { 640, 0x38 }, + { 768, 0x39 }, { 896, 0x3A }, { 960, 0x17 }, { 1024, 0x3B }, + { 1152, 0x18 }, { 1280, 0x3C }, { 1536, 0x3D }, { 1792, 0x3E }, + { 1920, 0x1B }, { 2048, 0x3F }, { 2304, 0x1C }, { 2560, 0x1D }, + { 3072, 0x1E }, { 3840, 0x1F } +}; +#endif -void i2c_init(int speed, int unused) +/* + * Calculate and set proper clock divider + */ +static uint8_t i2c_imx_get_clk(unsigned int rate) { - int freq = mx31_get_ipg_clk(); - int i; + unsigned int i2c_clk_rate; + unsigned int div; + u8 clk_div; - for (i = 0; i < 0x1f; i++) - if (freq / div[i] <= speed) - break; +#if defined(CONFIG_MX31) + struct clock_control_regs *sc_regs = + (struct clock_control_regs *)CCM_BASE; - DPRINTF("%s: speed: %d\n",__FUNCTION__, speed); + /* start the required I2C clock */ + writel(readl(&sc_regs->cgr0) | (3 << CONFIG_SYS_I2C_CLK_OFFSET), + &sc_regs->cgr0); +#endif - __REG16(I2C_BASE + I2CR) = 0; /* Reset module */ - __REG16(I2C_BASE + IFDR) = i; - __REG16(I2C_BASE + I2CR) = I2CR_IEN; - __REG16(I2C_BASE + I2SR) = 0; + /* Divider value calculation */ + i2c_clk_rate = mxc_get_clock(MXC_I2C_CLK); + div = (i2c_clk_rate + rate - 1) / rate; + if (div < i2c_clk_div[0][0]) + clk_div = 0; + else if (div > i2c_clk_div[ARRAY_SIZE(i2c_clk_div) - 1][0]) + clk_div = ARRAY_SIZE(i2c_clk_div) - 1; + else + for (clk_div = 0; i2c_clk_div[clk_div][0] < div; clk_div++) + ; + + /* Store divider value */ + return clk_div; } -static int wait_busy(void) +/* + * Set I2C Bus speed + */ +static int bus_i2c_set_bus_speed(void *base, int speed) { - int timeout = 10000; + struct mxc_i2c_regs *i2c_regs = (struct mxc_i2c_regs *)base; + u8 clk_idx = i2c_imx_get_clk(speed); + u8 idx = i2c_clk_div[clk_idx][1]; - while (!(__REG16(I2C_BASE + I2SR) & I2SR_IIF) && --timeout) - udelay(1); - __REG16(I2C_BASE + I2SR) = 0; /* clear interrupt */ + /* Store divider value */ + writeb(idx, &i2c_regs->ifdr); - return timeout; + /* Reset module */ + writeb(I2CR_IDIS, &i2c_regs->i2cr); + writeb(0, &i2c_regs->i2sr); + return 0; } -static int tx_byte(u8 byte) +/* + * Get I2C Speed + */ +static unsigned int bus_i2c_get_bus_speed(void *base) { - __REG16(I2C_BASE + I2DR) = byte; + struct mxc_i2c_regs *i2c_regs = (struct mxc_i2c_regs *)base; + u8 clk_idx = readb(&i2c_regs->ifdr); + u8 clk_div; - if (!wait_busy() || __REG16(I2C_BASE + I2SR) & I2SR_RX_NO_AK) - return -1; + for (clk_div = 0; i2c_clk_div[clk_div][1] != clk_idx; clk_div++) + ; + + return mxc_get_clock(MXC_I2C_CLK) / i2c_clk_div[clk_div][0]; +} + +#define ST_BUS_IDLE (0 | (I2SR_IBB << 8)) +#define ST_BUS_BUSY (I2SR_IBB | (I2SR_IBB << 8)) +#define ST_IIF (I2SR_IIF | (I2SR_IIF << 8)) + +static int wait_for_sr_state(struct mxc_i2c_regs *i2c_regs, unsigned state) +{ + unsigned sr; + ulong elapsed; + ulong start_time = get_timer(0); + for (;;) { + sr = readb(&i2c_regs->i2sr); + if (sr & I2SR_IAL) { +#ifdef I2C_QUIRK_REG + writeb(sr | I2SR_IAL, &i2c_regs->i2sr); +#else + writeb(sr & ~I2SR_IAL, &i2c_regs->i2sr); +#endif + printf("%s: Arbitration lost sr=%x cr=%x state=%x\n", + __func__, sr, readb(&i2c_regs->i2cr), state); + return -ERESTART; + } + if ((sr & (state >> 8)) == (unsigned char)state) + return sr; + WATCHDOG_RESET(); + elapsed = get_timer(start_time); + if (elapsed > (CONFIG_SYS_HZ / 10)) /* .1 seconds */ + break; + } + printf("%s: failed sr=%x cr=%x state=%x\n", __func__, + sr, readb(&i2c_regs->i2cr), state); + return -ETIMEDOUT; +} + +static int tx_byte(struct mxc_i2c_regs *i2c_regs, u8 byte) +{ + int ret; + + writeb(I2SR_IIF_CLEAR, &i2c_regs->i2sr); + writeb(byte, &i2c_regs->i2dr); + ret = wait_for_sr_state(i2c_regs, ST_IIF); + if (ret < 0) + return ret; + if (ret & I2SR_RX_NO_AK) + return -ENODEV; return 0; } -static int rx_byte(void) +/* + * Stop I2C transaction + */ +static void i2c_imx_stop(struct mxc_i2c_regs *i2c_regs) { - if (!wait_busy()) - return -1; + int ret; + unsigned int temp = readb(&i2c_regs->i2cr); - return __REG16(I2C_BASE + I2DR); + temp &= ~(I2CR_MSTA | I2CR_MTX); + writeb(temp, &i2c_regs->i2cr); + ret = wait_for_sr_state(i2c_regs, ST_BUS_IDLE); + if (ret < 0) + printf("%s:trigger stop failed\n", __func__); } -int i2c_probe(uchar chip) +/* + * Send start signal, chip address and + * write register address + */ +static int i2c_init_transfer_(struct mxc_i2c_regs *i2c_regs, + uchar chip, uint addr, int alen) { + unsigned int temp; int ret; - __REG16(I2C_BASE + I2CR) = 0; /* Reset module */ - __REG16(I2C_BASE + I2CR) = I2CR_IEN; + /* Enable I2C controller */ +#ifdef I2C_QUIRK_REG + if (readb(&i2c_regs->i2cr) & I2CR_IDIS) { +#else + if (!(readb(&i2c_regs->i2cr) & I2CR_IEN)) { +#endif + writeb(I2CR_IEN, &i2c_regs->i2cr); + /* Wait for controller to be stable */ + udelay(50); + } + if (readb(&i2c_regs->iadr) == (chip << 1)) + writeb((chip << 1) ^ 2, &i2c_regs->iadr); + writeb(I2SR_IIF_CLEAR, &i2c_regs->i2sr); + ret = wait_for_sr_state(i2c_regs, ST_BUS_IDLE); + if (ret < 0) + return ret; + + /* Start I2C transaction */ + temp = readb(&i2c_regs->i2cr); + temp |= I2CR_MSTA; + writeb(temp, &i2c_regs->i2cr); + + ret = wait_for_sr_state(i2c_regs, ST_BUS_BUSY); + if (ret < 0) + return ret; + + temp |= I2CR_MTX | I2CR_TX_NO_AK; + writeb(temp, &i2c_regs->i2cr); + + /* write slave address */ + ret = tx_byte(i2c_regs, chip << 1); + if (ret < 0) + return ret; + + while (alen--) { + ret = tx_byte(i2c_regs, (addr >> (alen * 8)) & 0xff); + if (ret < 0) + return ret; + } + return 0; +} - __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MSTA | I2CR_MTX; - ret = tx_byte(chip << 1); - __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MTX; +static int i2c_idle_bus(void *base); +static int i2c_init_transfer(struct mxc_i2c_regs *i2c_regs, + uchar chip, uint addr, int alen) +{ + int retry; + int ret; + for (retry = 0; retry < 3; retry++) { + ret = i2c_init_transfer_(i2c_regs, chip, addr, alen); + if (ret >= 0) + return 0; + i2c_imx_stop(i2c_regs); + if (ret == -ENODEV) + return ret; + + printf("%s: failed for chip 0x%x retry=%d\n", __func__, chip, + retry); + if (ret != -ERESTART) + /* Disable controller */ + writeb(I2CR_IDIS, &i2c_regs->i2cr); + udelay(100); + if (i2c_idle_bus(i2c_regs) < 0) + break; + } + printf("%s: give up i2c_regs=%p\n", __func__, i2c_regs); return ret; } -static int i2c_addr(uchar chip, uint addr, int alen) +/* + * Read data from I2C device + */ +int bus_i2c_read(void *base, uchar chip, uint addr, int alen, uchar *buf, + int len) { - __REG16(I2C_BASE + I2SR) = 0; /* clear interrupt */ - __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MSTA | I2CR_MTX; + int ret; + unsigned int temp; + int i; + struct mxc_i2c_regs *i2c_regs = (struct mxc_i2c_regs *)base; - if (tx_byte(chip << 1)) - return -1; + ret = i2c_init_transfer(i2c_regs, chip, addr, alen); + if (ret < 0) + return ret; + + temp = readb(&i2c_regs->i2cr); + temp |= I2CR_RSTA; + writeb(temp, &i2c_regs->i2cr); - while (alen--) - if (tx_byte((addr >> (alen * 8)) & 0xff)) - return -1; + ret = tx_byte(i2c_regs, (chip << 1) | 1); + if (ret < 0) { + i2c_imx_stop(i2c_regs); + return ret; + } + + /* setup bus to read data */ + temp = readb(&i2c_regs->i2cr); + temp &= ~(I2CR_MTX | I2CR_TX_NO_AK); + if (len == 1) + temp |= I2CR_TX_NO_AK; + writeb(temp, &i2c_regs->i2cr); + writeb(I2SR_IIF_CLEAR, &i2c_regs->i2sr); + readb(&i2c_regs->i2dr); /* dummy read to clear ICF */ + + /* read data */ + for (i = 0; i < len; i++) { + ret = wait_for_sr_state(i2c_regs, ST_IIF); + if (ret < 0) { + i2c_imx_stop(i2c_regs); + return ret; + } + + /* + * It must generate STOP before read I2DR to prevent + * controller from generating another clock cycle + */ + if (i == (len - 1)) { + i2c_imx_stop(i2c_regs); + } else if (i == (len - 2)) { + temp = readb(&i2c_regs->i2cr); + temp |= I2CR_TX_NO_AK; + writeb(temp, &i2c_regs->i2cr); + } + writeb(I2SR_IIF_CLEAR, &i2c_regs->i2sr); + buf[i] = readb(&i2c_regs->i2dr); + } + i2c_imx_stop(i2c_regs); return 0; } -int i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len) +/* + * Write data to I2C device + */ +int bus_i2c_write(void *base, uchar chip, uint addr, int alen, + const uchar *buf, int len) { - int timeout = 10000; int ret; + int i; + struct mxc_i2c_regs *i2c_regs = (struct mxc_i2c_regs *)base; - DPRINTF("%s chip: 0x%02x addr: 0x%04x alen: %d len: %d\n",__FUNCTION__, chip, addr, alen, len); + ret = i2c_init_transfer(i2c_regs, chip, addr, alen); + if (ret < 0) + return ret; - if (i2c_addr(chip, addr, alen)) { - printf("i2c_addr failed\n"); - return -1; + for (i = 0; i < len; i++) { + ret = tx_byte(i2c_regs, buf[i]); + if (ret < 0) + break; } + i2c_imx_stop(i2c_regs); + return ret; +} - __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MSTA | I2CR_MTX | I2CR_RSTA; +struct i2c_parms { + void *base; + void *idle_bus_data; + int (*idle_bus_fn)(void *p); +}; - if (tx_byte(chip << 1 | 1)) - return -1; +struct sram_data { + unsigned curr_i2c_bus; + struct i2c_parms i2c_data[3]; +}; - __REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MSTA | ((len == 1) ? I2CR_TX_NO_AK : 0); +/* + * For SPL boot some boards need i2c before SDRAM is initialized so force + * variables to live in SRAM + */ +static struct sram_data __attribute__((section(".data"))) srdata; - ret = __REG16(I2C_BASE + I2DR); +void *get_base(void) +{ +#ifdef CONFIG_SYS_I2C_BASE +#ifdef CONFIG_I2C_MULTI_BUS + void *ret = srdata.i2c_data[srdata.curr_i2c_bus].base; + if (ret) + return ret; +#endif + return (void *)CONFIG_SYS_I2C_BASE; +#elif defined(CONFIG_I2C_MULTI_BUS) + return srdata.i2c_data[srdata.curr_i2c_bus].base; +#else + return srdata.i2c_data[0].base; +#endif +} - 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; +static struct i2c_parms *i2c_get_parms(void *base) +{ + int i = 0; + struct i2c_parms *p = srdata.i2c_data; + while (i < ARRAY_SIZE(srdata.i2c_data)) { + if (p->base == base) + return p; + p++; + i++; } + printf("Invalid I2C base: %p\n", base); + return NULL; +} - wait_busy(); - - __REG16(I2C_BASE + I2CR) = I2CR_IEN; +static int i2c_idle_bus(void *base) +{ + struct i2c_parms *p = i2c_get_parms(base); + if (p && p->idle_bus_fn) + return p->idle_bus_fn(p->idle_bus_data); + return 0; +} - while (__REG16(I2C_BASE + I2SR) & I2SR_IBB && --timeout) - udelay(1); +#ifdef CONFIG_I2C_MULTI_BUS +unsigned int i2c_get_bus_num(void) +{ + return srdata.curr_i2c_bus; +} +int i2c_set_bus_num(unsigned bus_idx) +{ + if (bus_idx >= ARRAY_SIZE(srdata.i2c_data)) + return -1; + if (!srdata.i2c_data[bus_idx].base) + return -1; + srdata.curr_i2c_bus = bus_idx; return 0; } +#endif -int i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len) +int i2c_read(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); + return bus_i2c_read(get_base(), chip, addr, alen, buf, len); +} - if (i2c_addr(chip, addr, alen)) - return -1; +int i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len) +{ + return bus_i2c_write(get_base(), chip, addr, alen, buf, len); +} - while (len--) - if (tx_byte(*buf++)) - return -1; +/* + * Test if a chip at a given address responds (probe the chip) + */ +int i2c_probe(uchar chip) +{ + return bus_i2c_write(get_base(), chip, 0, 0, NULL, 0); +} - __REG16(I2C_BASE + I2CR) = I2CR_IEN; +void bus_i2c_init(void *base, int speed, int unused, + int (*idle_bus_fn)(void *p), void *idle_bus_data) +{ + int i = 0; + struct i2c_parms *p = srdata.i2c_data; + if (!base) + return; + for (;;) { + if (!p->base || (p->base == base)) { + p->base = base; + if (idle_bus_fn) { + p->idle_bus_fn = idle_bus_fn; + p->idle_bus_data = idle_bus_data; + } + break; + } + p++; + i++; + if (i >= ARRAY_SIZE(srdata.i2c_data)) + return; + } + bus_i2c_set_bus_speed(base, speed); +} - while (__REG16(I2C_BASE + I2SR) & I2SR_IBB && --timeout) - udelay(1); +/* + * Init I2C Bus + */ +void i2c_init(int speed, int unused) +{ + bus_i2c_init(get_base(), speed, unused, NULL, NULL); +} - return 0; +/* + * Set I2C Speed + */ +int i2c_set_bus_speed(unsigned int speed) +{ + return bus_i2c_set_bus_speed(get_base(), speed); } -#endif /* CONFIG_HARD_I2C */ +/* + * Get I2C Speed + */ +unsigned int i2c_get_bus_speed(void) +{ + return bus_i2c_get_bus_speed(get_base()); +}