diff options
Diffstat (limited to 'src/soc/samsung/exynos5420/i2c.c')
| -rw-r--r-- | src/soc/samsung/exynos5420/i2c.c | 706 |
1 files changed, 706 insertions, 0 deletions
diff --git a/src/soc/samsung/exynos5420/i2c.c b/src/soc/samsung/exynos5420/i2c.c new file mode 100644 index 0000000000..226862802a --- /dev/null +++ b/src/soc/samsung/exynos5420/i2c.c @@ -0,0 +1,706 @@ +/* + * This file is part of the coreboot project. + * + * (C) Copyright 2002 + * David Mueller, ELSOFT AG, d.mueller@elsoft.ch + * + * 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; version 2 of the License. + * + * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <console/console.h> +#include <delay.h> +#include <timer.h> +#include <arch/io.h> +#include <device/i2c.h> +#include "clk.h" +#include "i2c.h" +#include "pinmux.h" + +#define I2C_WRITE 0 +#define I2C_READ 1 + +#define I2C_OK 0 +#define I2C_NOK 1 +#define I2C_NACK 2 +#define I2C_NOK_LA 3 /* Lost arbitration */ +#define I2C_NOK_TOUT 4 /* time out */ + +/* HSI2C specific register description */ + +/* I2C_CTL Register bits */ +/* FIXME(dhendrix): do we really need to cast these as unsigned? */ +#define HSI2C_FUNC_MODE_I2C (1u << 0) +#define HSI2C_MASTER (1u << 3) +#define HSI2C_RXCHON (1u << 6) /* Write/Send */ +#define HSI2C_TXCHON (1u << 7) /* Read/Receive */ +#define HSI2C_SW_RST (1u << 31) + +/* I2C_FIFO_STAT Register bits */ +#define HSI2C_TX_FIFO_LEVEL (0x7f << 0) +#define HSI2C_TX_FIFO_FULL (1u << 7) +#define HSI2C_TX_FIFO_EMPTY (1u << 8) +#define HSI2C_RX_FIFO_LEVEL (0x7f << 16) +#define HSI2C_RX_FIFO_FULL (1u << 23) +#define HSI2C_RX_FIFO_EMPTY (1u << 24) + +/* I2C_FIFO_CTL Register bits */ +#define HSI2C_RXFIFO_EN (1u << 0) +#define HSI2C_TXFIFO_EN (1u << 1) +#define HSI2C_TXFIFO_TRIGGER_LEVEL (0x20 << 16) +#define HSI2C_RXFIFO_TRIGGER_LEVEL (0x20 << 4) + +/* I2C_TRAILING_CTL Register bits */ +#define HSI2C_TRAILING_COUNT (0xff) + +/* I2C_INT_EN Register bits */ +#define HSI2C_INT_TX_ALMOSTEMPTY_EN (1u << 0) +#define HSI2C_INT_RX_ALMOSTFULL_EN (1u << 1) +#define HSI2C_INT_TRAILING_EN (1u << 6) +#define HSI2C_INT_I2C_EN (1u << 9) + +/* I2C_CONF Register bits */ +#define HSI2C_AUTO_MODE (1u << 31) +#define HSI2C_10BIT_ADDR_MODE (1u << 30) +#define HSI2C_HS_MODE (1u << 29) + +/* I2C_AUTO_CONF Register bits */ +#define HSI2C_READ_WRITE (1u << 16) +#define HSI2C_STOP_AFTER_TRANS (1u << 17) +#define HSI2C_MASTER_RUN (1u << 31) + +/* I2C_TIMEOUT Register bits */ +#define HSI2C_TIMEOUT_EN (1u << 31) + +/* I2C_TRANS_STATUS register bits */ +#define HSI2C_MASTER_BUSY (1u << 17) +#define HSI2C_SLAVE_BUSY (1u << 16) +#define HSI2C_TIMEOUT_AUTO (1u << 4) +#define HSI2C_NO_DEV (1u << 3) +#define HSI2C_NO_DEV_ACK (1u << 2) +#define HSI2C_TRANS_ABORT (1u << 1) +#define HSI2C_TRANS_DONE (1u << 0) + +#define HSI2C_SLV_ADDR_MAS(x) ((x & 0x3ff) << 10) + +/* S3C I2C Controller bits */ +#define I2CSTAT_BSY 0x20 /* Busy bit */ +#define I2CSTAT_NACK 0x01 /* Nack bit */ +#define I2CCON_ACKGEN 0x80 /* Acknowledge generation */ +#define I2CCON_IRPND 0x10 /* Interrupt pending bit */ +#define I2C_MODE_MT 0xC0 /* Master Transmit Mode */ +#define I2C_MODE_MR 0x80 /* Master Receive Mode */ +#define I2C_START_STOP 0x20 /* START / STOP */ +#define I2C_TXRX_ENA 0x10 /* I2C Tx/Rx enable */ + +#define I2C_TIMEOUT_MS 1000 /* 1 second */ + +#define HSI2C_TIMEOUT 100 + +/* The timeouts we live by */ +enum { + I2C_XFER_TIMEOUT_MS = 35, /* xfer to complete */ + I2C_INIT_TIMEOUT_MS = 1000, /* bus free on init */ + I2C_IDLE_TIMEOUT_MS = 100, /* waiting for bus idle */ + I2C_STOP_TIMEOUT_US = 200, /* waiting for stop events */ +}; + +static struct s3c24x0_i2c_bus i2c_buses[] = { + { + .bus_num = 0, + .regs = (struct s3c24x0_i2c *)0x12c60000, + .periph_id = PERIPH_ID_I2C0, + }, + { + .bus_num = 1, + .regs = (struct s3c24x0_i2c *)0x12c70000, + .periph_id = PERIPH_ID_I2C1, + }, + { + .bus_num = 2, + .regs = (struct s3c24x0_i2c *)0x12c80000, + .periph_id = PERIPH_ID_I2C2, + }, + { + .bus_num = 3, + .regs = (struct s3c24x0_i2c *)0x12c90000, + .periph_id = PERIPH_ID_I2C3, + }, + /* I2C4-I2C10 are part of the USI block */ + { + .bus_num = 4, + .hsregs = (struct exynos5_hsi2c *)0x12ca0000, + .periph_id = PERIPH_ID_I2C4, + .is_highspeed = 1, + }, + { + .bus_num = 5, + .hsregs = (struct exynos5_hsi2c *)0x12cb0000, + .periph_id = PERIPH_ID_I2C5, + .is_highspeed = 1, + }, + { + .bus_num = 6, + .hsregs = (struct exynos5_hsi2c *)0x12cc0000, + .periph_id = PERIPH_ID_I2C6, + .is_highspeed = 1, + }, + { + .bus_num = 7, + .hsregs = (struct exynos5_hsi2c *)0x12cd0000, + .periph_id = PERIPH_ID_I2C7, + .is_highspeed = 1, + }, + { + .bus_num = 8, + .hsregs = (struct exynos5_hsi2c *)0x12e00000, + .periph_id = PERIPH_ID_I2C8, + .is_highspeed = 1, + }, + { + .bus_num = 9, + .hsregs = (struct exynos5_hsi2c *)0x12e10000, + .periph_id = PERIPH_ID_I2C9, + .is_highspeed = 1, + }, + { + .bus_num = 10, + .hsregs = (struct exynos5_hsi2c *)0x12e20000, + .periph_id = PERIPH_ID_I2C10, + .is_highspeed = 1, + }, +}; + +/* + * Wait til the byte transfer is completed. + * + * @param i2c- pointer to the appropriate i2c register bank. + * @return I2C_OK, if transmission was ACKED + * I2C_NACK, if transmission was NACKED + * I2C_NOK_TIMEOUT, if transaction did not complete in I2C_TIMEOUT_MS + */ + +static int WaitForXfer(struct s3c24x0_i2c *i2c) +{ + struct mono_time current, end; + + timer_monotonic_get(¤t); + end = current; + mono_time_add_usecs(&end, I2C_TIMEOUT_MS * 1000); + do { + if (read32(&i2c->iiccon) & I2CCON_IRPND) + return (read32(&i2c->iicstat) & I2CSTAT_NACK) ? + I2C_NACK : I2C_OK; + timer_monotonic_get(¤t); + } while (mono_time_before(¤t, &end)); + + printk(BIOS_ERR, "%s timed out\n", __func__); + return I2C_NOK_TOUT; +} + +static void ReadWriteByte(struct s3c24x0_i2c *i2c) +{ + writel(read32(&i2c->iiccon) & ~I2CCON_IRPND, &i2c->iiccon); +} + +static void i2c_ch_init(struct s3c24x0_i2c_bus *bus, int speed, int slaveadd) +{ + unsigned long freq, pres = 16, div; + unsigned long val; + + freq = clock_get_periph_rate(bus->periph_id); + /* calculate prescaler and divisor values */ + if ((freq / pres / (16 + 1)) > speed) + /* set prescaler to 512 */ + pres = 512; + + div = 0; + while ((freq / pres / (div + 1)) > speed) + div++; + + /* set prescaler, divisor according to freq, also set ACKGEN, IRQ */ + val = (div & 0x0F) | 0xA0 | ((pres == 512) ? 0x40 : 0); + write32(val, &bus->regs->iiccon); + + /* init to SLAVE RECEIVE mode and clear I2CADDn */ + write32(0, &bus->regs->iicstat); + write32(slaveadd, &bus->regs->iicadd); + /* program Master Transmit (and implicit STOP) */ + write32(I2C_MODE_MT | I2C_TXRX_ENA, &bus->regs->iicstat); +} + +static int hsi2c_get_clk_details(struct s3c24x0_i2c_bus *i2c_bus, + unsigned int bus_freq_hz) +{ + struct exynos5_hsi2c *hsregs = i2c_bus->hsregs; + unsigned long clkin = clock_get_periph_rate(i2c_bus->periph_id); + unsigned int i = 0, utemp0 = 0, utemp1 = 0; + unsigned int t_ftl_cycle; + + /* FPCLK / FI2C = + * (CLK_DIV + 1) * (TSCLK_L + TSCLK_H + 2) + 8 + 2 * FLT_CYCLE + * uTemp0 = (CLK_DIV + 1) * (TSCLK_L + TSCLK_H + 2) + * uTemp1 = (TSCLK_L + TSCLK_H + 2) + * uTemp2 = TSCLK_L + TSCLK_H + */ + t_ftl_cycle = (read32(&hsregs->usi_conf) >> 16) & 0x7; + utemp0 = (clkin / bus_freq_hz) - 8 - 2 * t_ftl_cycle; + + /* CLK_DIV max is 256 */ + for (i = 0; i < 256; i++) { + utemp1 = utemp0 / (i + 1); + if ((utemp1 < 512) && (utemp1 > 4)) { + i2c_bus->clk_cycle = utemp1 - 2; + i2c_bus->clk_div = i; + return 0; + } + } + printk(BIOS_ERR, "%s: failed?\n", __func__); + return -1; +} + +static void hsi2c_ch_init(struct s3c24x0_i2c_bus *i2c_bus, + unsigned int bus_freq_hz) +{ + struct exynos5_hsi2c *hsregs = i2c_bus->hsregs; + unsigned int t_sr_release; + unsigned int n_clkdiv; + unsigned int t_start_su, t_start_hd; + unsigned int t_stop_su; + unsigned int t_data_su, t_data_hd; + unsigned int t_scl_l, t_scl_h; + u32 i2c_timing_s1; + u32 i2c_timing_s2; + u32 i2c_timing_s3; + u32 i2c_timing_sla; + + hsi2c_get_clk_details(i2c_bus, bus_freq_hz); + + n_clkdiv = i2c_bus->clk_div; + t_scl_l = i2c_bus->clk_cycle / 2; + t_scl_h = i2c_bus->clk_cycle / 2; + t_start_su = t_scl_l; + t_start_hd = t_scl_l; + t_stop_su = t_scl_l; + t_data_su = t_scl_l / 2; + t_data_hd = t_scl_l / 2; + t_sr_release = i2c_bus->clk_cycle; + + i2c_timing_s1 = t_start_su << 24 | t_start_hd << 16 | t_stop_su << 8; + i2c_timing_s2 = t_data_su << 24 | t_scl_l << 8 | t_scl_h << 0; + i2c_timing_s3 = n_clkdiv << 16 | t_sr_release << 0; + i2c_timing_sla = t_data_hd << 0; + + write32(HSI2C_TRAILING_COUNT, &hsregs->usi_trailing_ctl); + + /* Clear to enable Timeout */ + clrsetbits_le32(&hsregs->usi_timeout, HSI2C_TIMEOUT_EN, 0); + + write32(read32(&hsregs->usi_conf) | HSI2C_AUTO_MODE, &hsregs->usi_conf); + + /* Currently operating in Fast speed mode. */ + write32(i2c_timing_s1, &hsregs->usi_timing_fs1); + write32(i2c_timing_s2, &hsregs->usi_timing_fs2); + write32(i2c_timing_s3, &hsregs->usi_timing_fs3); + write32(i2c_timing_sla, &hsregs->usi_timing_sla); + + /* Enable TXFIFO and RXFIFO */ + write32(HSI2C_RXFIFO_EN | HSI2C_TXFIFO_EN, &hsregs->usi_fifo_ctl); + + /* i2c_conf configure */ + write32(readl(&hsregs->usi_conf) | HSI2C_AUTO_MODE, &hsregs->usi_conf); +} + +/* SW reset for the high speed bus */ +static void i2c_reset(struct s3c24x0_i2c_bus *i2c_bus) +{ + struct exynos5_hsi2c *i2c = i2c_bus->hsregs; + u32 i2c_ctl; + + /* Set and clear the bit for reset */ + i2c_ctl = read32(&i2c->usi_ctl); + i2c_ctl |= HSI2C_SW_RST; + write32(i2c_ctl, &i2c->usi_ctl); + + i2c_ctl = read32(&i2c->usi_ctl); + i2c_ctl &= ~HSI2C_SW_RST; + write32(i2c_ctl, &i2c->usi_ctl); + + /* Initialize the configure registers */ + /* FIXME: This just assumes 100KHz as a default bus freq */ + hsi2c_ch_init(i2c_bus, 100000); +} + +void i2c_init(unsigned bus_num, int speed, int slaveadd) +{ + struct s3c24x0_i2c_bus *i2c; + + i2c = &i2c_buses[bus_num]; + + i2c_reset(i2c); + + if (i2c->is_highspeed) + hsi2c_ch_init(i2c, speed); + else + i2c_ch_init(i2c, speed, slaveadd); +} + +/* + * Check whether the transfer is complete. + * Return values: + * 0 - transfer not done + * 1 - transfer finished successfully + * -1 - transfer failed + */ +static int hsi2c_check_transfer(struct exynos5_hsi2c *i2c) +{ + uint32_t status = read32(&i2c->usi_trans_status); + if (status & (HSI2C_TRANS_ABORT | HSI2C_NO_DEV_ACK | + HSI2C_NO_DEV | HSI2C_TIMEOUT_AUTO)) { + if (status & HSI2C_TRANS_ABORT) + printk(BIOS_ERR, + "%s: Transaction aborted.\n", __func__); + if (status & HSI2C_NO_DEV_ACK) + printk(BIOS_ERR, + "%s: No ack from device.\n", __func__); + if (status & HSI2C_NO_DEV) + printk(BIOS_ERR, + "%s: No response from device.\n", __func__); + if (status & HSI2C_TIMEOUT_AUTO) + printk(BIOS_ERR, + "%s: Transaction time out.\n", __func__); + return -1; + } + return !(status & HSI2C_MASTER_BUSY); +} + +/* + * Wait for the transfer to finish. + * Return values: + * 0 - transfer not done + * 1 - transfer finished successfully + * -1 - transfer failed + */ +static int hsi2c_wait_for_transfer(struct exynos5_hsi2c *i2c) +{ + struct mono_time current, end; + + timer_monotonic_get(¤t); + end = current; + mono_time_add_usecs(&end, HSI2C_TIMEOUT * 1000); + while (mono_time_before(¤t, &end)) { + int ret = hsi2c_check_transfer(i2c); + if (ret) + return ret; + udelay(5); + timer_monotonic_get(¤t); + } + return 0; +} + +static int hsi2c_senddata(struct exynos5_hsi2c *i2c, const uint8_t *data, + int len) +{ + while (!hsi2c_check_transfer(i2c) && len) { + if (!(read32(&i2c->usi_fifo_stat) & HSI2C_TX_FIFO_FULL)) { + write32(*data++, &i2c->usi_txdata); + len--; + } + } + return len ? -1 : 0; +} + +static int hsi2c_recvdata(struct exynos5_hsi2c *i2c, uint8_t *data, int len) +{ + while (!hsi2c_check_transfer(i2c) && len) { + if (!(read32(&i2c->usi_fifo_stat) & HSI2C_RX_FIFO_EMPTY)) { + *data++ = read32(&i2c->usi_rxdata); + len--; + } + } + return len ? -1 : 0; +} + +static int hsi2c_write(struct exynos5_hsi2c *i2c, + unsigned char chip, + unsigned char addr[], + unsigned char alen, + const uint8_t data[], + unsigned short len) +{ + uint32_t i2c_auto_conf; + + if (hsi2c_wait_for_transfer(i2c) != 1) + return -1; + + /* chip address */ + write32(HSI2C_SLV_ADDR_MAS(chip), &i2c->i2c_addr); + + /* usi_ctl enable i2c func, master write configure */ + write32((HSI2C_TXCHON | HSI2C_FUNC_MODE_I2C | HSI2C_MASTER), + &i2c->usi_ctl); + + /* auto_conf for write length and stop configure */ + i2c_auto_conf = ((len + alen) | HSI2C_STOP_AFTER_TRANS); + i2c_auto_conf &= ~HSI2C_READ_WRITE; + /* Master run, start xfer */ + i2c_auto_conf |= HSI2C_MASTER_RUN; + write32(i2c_auto_conf, &i2c->usi_auto_conf); + + if (hsi2c_senddata(i2c, addr, alen) || + hsi2c_senddata(i2c, data, len) || + hsi2c_wait_for_transfer(i2c) != 1) { + return -1; + } + + write32(HSI2C_FUNC_MODE_I2C, &i2c->usi_ctl); + return 0; +} + +static int hsi2c_read(struct exynos5_hsi2c *i2c, + unsigned char chip, + unsigned char addr[], + unsigned char alen, + uint8_t data[], + unsigned short len, + int check) +{ + uint32_t i2c_auto_conf; + + /* start read */ + if (hsi2c_wait_for_transfer(i2c) != 1) + return -1; + + /* chip address */ + write32(HSI2C_SLV_ADDR_MAS(chip), &i2c->i2c_addr); + + /* usi_ctl enable i2c func, master write configure */ + write32((HSI2C_TXCHON | HSI2C_FUNC_MODE_I2C | HSI2C_MASTER), + &i2c->usi_ctl); + + /* auto_conf */ + write32(alen | HSI2C_MASTER_RUN | HSI2C_STOP_AFTER_TRANS, + &i2c->usi_auto_conf); + + if (hsi2c_senddata(i2c, addr, alen) || + hsi2c_wait_for_transfer(i2c) != 1) { + return -1; + } + + /* usi_ctl enable i2c func, master WRITE configure */ + write32((HSI2C_RXCHON | HSI2C_FUNC_MODE_I2C | HSI2C_MASTER), + &i2c->usi_ctl); + + /* auto_conf, length and stop configure */ + i2c_auto_conf = (len | HSI2C_STOP_AFTER_TRANS | HSI2C_READ_WRITE); + i2c_auto_conf |= HSI2C_MASTER_RUN; + /* Master run, start xfer */ + write32(i2c_auto_conf, &i2c->usi_auto_conf); + + if (hsi2c_recvdata(i2c, data, len) || + hsi2c_wait_for_transfer(i2c) != 1) { + return -1; + } + + write32(HSI2C_FUNC_MODE_I2C, &i2c->usi_ctl); + return 0; +} + +/* + * cmd_type is 0 for write, 1 for read. + * + * addr_len can take any value from 0-255, it is only limited + * by the char, we could make it larger if needed. If it is + * 0 we skip the address write cycle. + */ +static int i2c_transfer(struct s3c24x0_i2c *i2c, + unsigned char cmd_type, + unsigned char chip, + unsigned char addr[], + unsigned char addr_len, + unsigned char data[], + unsigned short data_len) +{ + int i = 0, result; + struct mono_time current, end; + + if (data == 0 || data_len == 0) { + printk(BIOS_ERR, "i2c_transfer: bad call\n"); + return I2C_NOK; + } + + timer_monotonic_get(¤t); + end = current; + mono_time_add_usecs(&end, I2C_TIMEOUT_MS * 1000); + while (readl(&i2c->iicstat) & I2CSTAT_BSY) { + if (!mono_time_before(¤t, &end)){ + printk(BIOS_ERR, "%s timed out\n", __func__); + return I2C_NOK_TOUT; + } + timer_monotonic_get(¤t); + } + + write32(read32(&i2c->iiccon) | I2CCON_ACKGEN, &i2c->iiccon); + + /* Get the slave chip address going */ + write32(chip, &i2c->iicds); + if ((cmd_type == I2C_WRITE) || (addr && addr_len)) + write32(I2C_MODE_MT | I2C_TXRX_ENA | I2C_START_STOP, + &i2c->iicstat); + else + write32(I2C_MODE_MR | I2C_TXRX_ENA | I2C_START_STOP, + &i2c->iicstat); + + /* Wait for chip address to transmit. */ + result = WaitForXfer(i2c); + if (result != I2C_OK) + goto bailout; + + /* If register address needs to be transmitted - do it now. */ + if (addr && addr_len) { + while ((i < addr_len) && (result == I2C_OK)) { + write32(addr[i++], &i2c->iicds); + ReadWriteByte(i2c); + result = WaitForXfer(i2c); + } + i = 0; + if (result != I2C_OK) + goto bailout; + } + + switch (cmd_type) { + case I2C_WRITE: + while ((i < data_len) && (result == I2C_OK)) { + write32(data[i++], &i2c->iicds); + ReadWriteByte(i2c); + result = WaitForXfer(i2c); + } + break; + + case I2C_READ: + if (addr && addr_len) { + /* + * Register address has been sent, now send slave chip + * address again to start the actual read transaction. + */ + write32(chip, &i2c->iicds); + + /* Generate a re-START. */ + write32(I2C_MODE_MR | I2C_TXRX_ENA | I2C_START_STOP, + &i2c->iicstat); + ReadWriteByte(i2c); + result = WaitForXfer(i2c); + if (result != I2C_OK) + goto bailout; + } + + while ((i < data_len) && (result == I2C_OK)) { + /* disable ACK for final READ */ + if (i == data_len - 1) + write32(readl(&i2c->iiccon) + & ~I2CCON_ACKGEN, + &i2c->iiccon); + ReadWriteByte(i2c); + result = WaitForXfer(i2c); + data[i++] = read32(&i2c->iicds); + } + if (result == I2C_NACK) + result = I2C_OK; /* Normal terminated read. */ + break; + + default: + printk(BIOS_ERR, "i2c_transfer: bad call\n"); + result = I2C_NOK; + break; + } + +bailout: + /* Send STOP. */ + write32(I2C_MODE_MR | I2C_TXRX_ENA, &i2c->iicstat); + ReadWriteByte(i2c); + + return result; +} + +int i2c_read(unsigned bus, unsigned chip, unsigned addr, + unsigned alen, uint8_t *buf, unsigned len) +{ + struct s3c24x0_i2c_bus *i2c; + unsigned char xaddr[4]; + int ret; + + if (alen > 4) { + printk(BIOS_ERR, "I2C read: addr len %d not supported\n", alen); + return 1; + } + + if (alen > 0) { + xaddr[0] = (addr >> 24) & 0xFF; + xaddr[1] = (addr >> 16) & 0xFF; + xaddr[2] = (addr >> 8) & 0xFF; + xaddr[3] = addr & 0xFF; + } + + i2c = &i2c_buses[bus]; + if (i2c->is_highspeed) + ret = hsi2c_read(i2c->hsregs, chip, &xaddr[4 - alen], + alen, buf, len, 0); + else + ret = i2c_transfer(i2c->regs, I2C_READ, chip << 1, + &xaddr[4 - alen], alen, buf, len); + if (ret) { + i2c_reset(i2c); + printk(BIOS_ERR, "I2C read (bus %02x, chip addr %02x) failed: " + "%d\n", bus, chip, ret); + return 1; + } + return 0; +} + +int i2c_write(unsigned bus, unsigned chip, unsigned addr, + unsigned alen, const uint8_t *buf, unsigned len) +{ + struct s3c24x0_i2c_bus *i2c; + unsigned char xaddr[4]; + int ret; + + if (alen > 4) { + printk(BIOS_ERR, "I2C write: addr len %d not supported\n", + alen); + return 1; + } + + if (alen > 0) { + xaddr[0] = (addr >> 24) & 0xFF; + xaddr[1] = (addr >> 16) & 0xFF; + xaddr[2] = (addr >> 8) & 0xFF; + xaddr[3] = addr & 0xFF; + } + + i2c = &i2c_buses[bus]; + if (i2c->is_highspeed) + ret = hsi2c_write(i2c->hsregs, chip, &xaddr[4 - alen], + alen, buf, len); + else + ret = i2c_transfer(i2c->regs, I2C_WRITE, chip << 1, + &xaddr[4 - alen], alen, (void *)buf, len); + + + if (ret != 0) { + i2c_reset(i2c); + printk(BIOS_ERR, "I2C write (bus %02x, chip addr %02x) failed: " + "%d\n", bus, chip, ret); + return 1; + } + return 0; +} |