X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;ds=sidebyside;f=drivers%2Fi2c%2Fs3c24x0_i2c.c;h=dc9b661c1cf754632cc7d673c024f860332e60b4;hb=009902a871dcb1ad60e746280372f47d90f65353;hp=46d25061ee6456a02a2780f5c363788f407981d2;hpb=412665b46134f93464c09405e02f08ac9c62526d;p=u-boot diff --git a/drivers/i2c/s3c24x0_i2c.c b/drivers/i2c/s3c24x0_i2c.c index 46d25061ee..dc9b661c1c 100644 --- a/drivers/i2c/s3c24x0_i2c.c +++ b/drivers/i2c/s3c24x0_i2c.c @@ -2,31 +2,16 @@ * (C) Copyright 2002 * David Mueller, ELSOFT AG, d.mueller@elsoft.ch * - * 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 + * SPDX-License-Identifier: GPL-2.0+ */ /* This code should work for both the S3C2400 and the S3C2410 * as they seem to have the same I2C controller inside. * The different address mapping is handled by the s3c24xx.h files below. */ - #include +#include +#include #include #if (defined CONFIG_EXYNOS4 || defined CONFIG_EXYNOS5) #include @@ -39,8 +24,6 @@ #include #include "s3c24x0_i2c.h" -#ifdef CONFIG_HARD_I2C - #define I2C_WRITE 0 #define I2C_READ 1 @@ -50,6 +33,76 @@ #define I2C_NOK_LA 3 /* Lost arbitration */ #define I2C_NOK_TOUT 4 /* time out */ +/* HSI2C specific register description */ + +/* I2C_CTL Register bits */ +#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_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_TX_UNDERRUN_EN (1u << 2) +#define HSI2C_TX_OVERRUN_EN (1u << 3) +#define HSI2C_RX_UNDERRUN_EN (1u << 4) +#define HSI2C_RX_OVERRUN_EN (1u << 5) +#define HSI2C_INT_TRAILING_EN (1u << 6) +#define HSI2C_INT_I2C_EN (1u << 9) + +#define HSI2C_INT_ERROR_MASK (HSI2C_TX_UNDERRUN_EN |\ + HSI2C_TX_OVERRUN_EN |\ + HSI2C_RX_UNDERRUN_EN |\ + HSI2C_RX_OVERRUN_EN |\ + HSI2C_INT_TRAILING_EN) + +/* 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_SUCCESS (1u << 0) +#define HSI2C_TRANS_ERROR_MASK (HSI2C_TIMEOUT_AUTO |\ + HSI2C_NO_DEV | HSI2C_NO_DEV_ACK |\ + HSI2C_TRANS_ABORT) +#define HSI2C_TRANS_FINISHED_MASK (HSI2C_TRANS_ERROR_MASK | HSI2C_TRANS_SUCCESS) + + +/* I2C_FIFO_STAT Register bits */ +#define HSI2C_RX_FIFO_EMPTY (1u << 24) +#define HSI2C_RX_FIFO_FULL (1u << 23) +#define HSI2C_TX_FIFO_EMPTY (1u << 8) +#define HSI2C_TX_FIFO_FULL (1u << 7) +#define HSI2C_RX_FIFO_LEVEL(x) (((x) >> 16) & 0x7f) +#define HSI2C_TX_FIFO_LEVEL(x) ((x) & 0x7f) + +#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 */ @@ -59,26 +112,60 @@ #define I2C_START_STOP 0x20 /* START / STOP */ #define I2C_TXRX_ENA 0x10 /* I2C Tx/Rx enable */ -#define I2C_TIMEOUT 1 /* 1 second */ +#define I2C_TIMEOUT_MS 10 /* 10 ms */ + +#define HSI2C_TIMEOUT_US 10000 /* 10 ms, finer granularity */ + + +/* To support VCMA9 boards and other who dont define max_i2c_num */ +#ifndef CONFIG_MAX_I2C_NUM +#define CONFIG_MAX_I2C_NUM 1 +#endif +DECLARE_GLOBAL_DATA_PTR; /* * For SPL boot some boards need i2c before SDRAM is initialised so force * variables to live in SRAM */ -static unsigned int g_current_bus __attribute__((section(".data"))); -#ifdef CONFIG_OF_CONTROL -static int i2c_busses __attribute__((section(".data"))); +#ifdef CONFIG_SYS_I2C static struct s3c24x0_i2c_bus i2c_bus[CONFIG_MAX_I2C_NUM] __attribute__((section(".data"))); #endif +enum exynos_i2c_type { + EXYNOS_I2C_STD, + EXYNOS_I2C_HS, +}; + +#ifdef CONFIG_SYS_I2C +/** + * Get a pointer to the given bus index + * + * @bus_idx: Bus index to look up + * @return pointer to bus, or NULL if invalid or not available + */ +static struct s3c24x0_i2c_bus *get_bus(unsigned int bus_idx) +{ + if (bus_idx < ARRAY_SIZE(i2c_bus)) { + struct s3c24x0_i2c_bus *bus; + + bus = &i2c_bus[bus_idx]; + if (bus->active) + return bus; + } + + debug("Undefined bus: %d\n", bus_idx); + return NULL; +} +#endif + #if !(defined CONFIG_EXYNOS4 || defined CONFIG_EXYNOS5) static int GetI2CSDA(void) { struct s3c24x0_gpio *gpio = s3c24x0_get_base_gpio(); -#ifdef CONFIG_S3C2410 +#if defined(CONFIG_S3C2410) || defined(CONFIG_S3C2440) return (readl(&gpio->gpedat) & 0x8000) >> 15; #endif #ifdef CONFIG_S3C2400 @@ -90,7 +177,7 @@ static void SetI2CSCL(int x) { struct s3c24x0_gpio *gpio = s3c24x0_get_base_gpio(); -#ifdef CONFIG_S3C2410 +#if defined(CONFIG_S3C2410) || defined(CONFIG_S3C2440) writel((readl(&gpio->gpedat) & ~0x4000) | (x & 1) << 14, &gpio->gpedat); #endif @@ -100,45 +187,100 @@ static void SetI2CSCL(int x) } #endif +/* + * 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) { - int i; + ulong start_time = get_timer(0); - i = I2C_TIMEOUT * 10000; - while (!(readl(&i2c->iiccon) & I2CCON_IRPND) && (i > 0)) { - udelay(100); - i--; - } + do { + if (readl(&i2c->iiccon) & I2CCON_IRPND) + return (readl(&i2c->iicstat) & I2CSTAT_NACK) ? + I2C_NACK : I2C_OK; + } while (get_timer(start_time) < I2C_TIMEOUT_MS); - return (readl(&i2c->iiccon) & I2CCON_IRPND) ? I2C_OK : I2C_NOK_TOUT; + return I2C_NOK_TOUT; } -static int IsACK(struct s3c24x0_i2c *i2c) +/* + * Wait for transfer completion. + * + * This function reads the interrupt status register waiting for the INT_I2C + * bit to be set, which indicates copletion of a transaction. + * + * @param i2c: pointer to the appropriate register bank + * + * @return: I2C_OK in case of successful completion, I2C_NOK_TIMEOUT in case + * the status bits do not get set in time, or an approrpiate error + * value in case of transfer errors. + */ +static int hsi2c_wait_for_trx(struct exynos5_hsi2c *i2c) { - return !(readl(&i2c->iicstat) & I2CSTAT_NACK); + int i = HSI2C_TIMEOUT_US; + + while (i-- > 0) { + u32 int_status = readl(&i2c->usi_int_stat); + + if (int_status & HSI2C_INT_I2C_EN) { + u32 trans_status = readl(&i2c->usi_trans_status); + + /* Deassert pending interrupt. */ + writel(int_status, &i2c->usi_int_stat); + + if (trans_status & HSI2C_NO_DEV_ACK) { + debug("%s: no ACK from device\n", __func__); + return I2C_NACK; + } + if (trans_status & HSI2C_NO_DEV) { + debug("%s: no device\n", __func__); + return I2C_NOK; + } + if (trans_status & HSI2C_TRANS_ABORT) { + debug("%s: arbitration lost\n", __func__); + return I2C_NOK_LA; + } + if (trans_status & HSI2C_TIMEOUT_AUTO) { + debug("%s: device timed out\n", __func__); + return I2C_NOK_TOUT; + } + return I2C_OK; + } + udelay(1); + } + debug("%s: transaction timeout!\n", __func__); + return I2C_NOK_TOUT; } -static void ReadWriteByte(struct s3c24x0_i2c *i2c) +static void read_write_byte(struct s3c24x0_i2c *i2c) { - writel(readl(&i2c->iiccon) & ~I2CCON_IRPND, &i2c->iiccon); + clrbits_le32(&i2c->iiccon, I2CCON_IRPND); } -static struct s3c24x0_i2c *get_base_i2c(void) +#ifdef CONFIG_SYS_I2C +static struct s3c24x0_i2c *get_base_i2c(int bus) { #ifdef CONFIG_EXYNOS4 struct s3c24x0_i2c *i2c = (struct s3c24x0_i2c *)(samsung_get_base_i2c() + (EXYNOS4_I2C_SPACING - * g_current_bus)); + * bus)); return i2c; #elif defined CONFIG_EXYNOS5 struct s3c24x0_i2c *i2c = (struct s3c24x0_i2c *)(samsung_get_base_i2c() + (EXYNOS5_I2C_SPACING - * g_current_bus)); + * bus)); return i2c; #else return s3c24x0_get_base_i2c(); #endif } +#endif static void i2c_ch_init(struct s3c24x0_i2c *i2c, int speed, int slaveadd) { @@ -167,55 +309,141 @@ static void i2c_ch_init(struct s3c24x0_i2c *i2c, int speed, int slaveadd) writel(I2C_MODE_MT | I2C_TXRX_ENA, &i2c->iicstat); } -/* - * MULTI BUS I2C support - */ - -#ifdef CONFIG_I2C_MULTI_BUS -int i2c_set_bus_num(unsigned int bus) +static int hsi2c_get_clk_details(struct s3c24x0_i2c_bus *i2c_bus) { - struct s3c24x0_i2c *i2c; + struct exynos5_hsi2c *hsregs = i2c_bus->hsregs; + ulong clkin; + unsigned int op_clk = i2c_bus->clock_frequency; + unsigned int i = 0, utemp0 = 0, utemp1 = 0; + unsigned int t_ftl_cycle; - if ((bus < 0) || (bus >= CONFIG_MAX_I2C_NUM)) { - debug("Bad bus: %d\n", bus); - return -1; +#if (defined CONFIG_EXYNOS4 || defined CONFIG_EXYNOS5) + clkin = get_i2c_clk(); +#else + clkin = get_PCLK(); +#endif + /* 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 = (readl(&hsregs->usi_conf) >> 16) & 0x7; + utemp0 = (clkin / op_clk) - 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; + } } + return -EINVAL; +} - g_current_bus = bus; - i2c = get_base_i2c(); - i2c_ch_init(i2c, CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE); - - return 0; +static void hsi2c_ch_init(struct s3c24x0_i2c_bus *i2c_bus) +{ + 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; + + 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; + + writel(HSI2C_TRAILING_COUNT, &hsregs->usi_trailing_ctl); + + /* Clear to enable Timeout */ + clrsetbits_le32(&hsregs->usi_timeout, HSI2C_TIMEOUT_EN, 0); + + /* set AUTO mode */ + writel(readl(&hsregs->usi_conf) | HSI2C_AUTO_MODE, &hsregs->usi_conf); + + /* Enable completion conditions' reporting. */ + writel(HSI2C_INT_I2C_EN, &hsregs->usi_int_en); + + /* Enable FIFOs */ + writel(HSI2C_RXFIFO_EN | HSI2C_TXFIFO_EN, &hsregs->usi_fifo_ctl); + + /* Currently operating in Fast speed mode. */ + writel(i2c_timing_s1, &hsregs->usi_timing_fs1); + writel(i2c_timing_s2, &hsregs->usi_timing_fs2); + writel(i2c_timing_s3, &hsregs->usi_timing_fs3); + writel(i2c_timing_sla, &hsregs->usi_timing_sla); } -unsigned int i2c_get_bus_num(void) +/* SW reset for the high speed bus */ +static void exynos5_i2c_reset(struct s3c24x0_i2c_bus *i2c_bus) { - return g_current_bus; + struct exynos5_hsi2c *i2c = i2c_bus->hsregs; + u32 i2c_ctl; + + /* Set and clear the bit for reset */ + i2c_ctl = readl(&i2c->usi_ctl); + i2c_ctl |= HSI2C_SW_RST; + writel(i2c_ctl, &i2c->usi_ctl); + + i2c_ctl = readl(&i2c->usi_ctl); + i2c_ctl &= ~HSI2C_SW_RST; + writel(i2c_ctl, &i2c->usi_ctl); + + /* Initialize the configure registers */ + hsi2c_ch_init(i2c_bus); } -#endif -void i2c_init(int speed, int slaveadd) +#ifdef CONFIG_SYS_I2C +static void s3c24x0_i2c_init(struct i2c_adapter *adap, int speed, int slaveadd) { struct s3c24x0_i2c *i2c; + struct s3c24x0_i2c_bus *bus; #if !(defined CONFIG_EXYNOS4 || defined CONFIG_EXYNOS5) struct s3c24x0_gpio *gpio = s3c24x0_get_base_gpio(); #endif - int i; + ulong start_time = get_timer(0); - /* By default i2c channel 0 is the current bus */ - g_current_bus = 0; - i2c = get_base_i2c(); + i2c = get_base_i2c(adap->hwadapnr); + bus = &i2c_bus[adap->hwadapnr]; + if (!bus) + return; - /* wait for some time to give previous transfer a chance to finish */ - i = I2C_TIMEOUT * 1000; - while ((readl(&i2c->iicstat) & I2CSTAT_BSY) && (i > 0)) { - udelay(1000); - i--; + /* + * In case the previous transfer is still going, wait to give it a + * chance to finish. + */ + while (readl(&i2c->iicstat) & I2CSTAT_BSY) { + if (get_timer(start_time) > I2C_TIMEOUT_MS) { + printf("%s: I2C bus busy for %p\n", __func__, + &i2c->iicstat); + return; + } } #if !(defined CONFIG_EXYNOS4 || defined CONFIG_EXYNOS5) + int i; + if ((readl(&i2c->iicstat) & I2CSTAT_BSY) || GetI2CSDA() == 0) { -#ifdef CONFIG_S3C2410 +#if defined(CONFIG_S3C2410) || defined(CONFIG_S3C2440) ulong old_gpecon = readl(&gpio->gpecon); #endif #ifdef CONFIG_S3C2400 @@ -224,7 +452,7 @@ void i2c_init(int speed, int slaveadd) /* bus still busy probably by (most) previously interrupted transfer */ -#ifdef CONFIG_S3C2410 +#if defined(CONFIG_S3C2410) || defined(CONFIG_S3C2440) /* set I2CSDA and I2CSCL (GPE15, GPE14) to GPIO */ writel((readl(&gpio->gpecon) & ~0xF0000000) | 0x10000000, &gpio->gpecon); @@ -250,7 +478,7 @@ void i2c_init(int speed, int slaveadd) udelay(1000); /* restore pin functions */ -#ifdef CONFIG_S3C2410 +#if defined(CONFIG_S3C2410) || defined(CONFIG_S3C2440) writel(old_gpecon, &gpio->gpecon); #endif #ifdef CONFIG_S3C2400 @@ -258,7 +486,263 @@ void i2c_init(int speed, int slaveadd) #endif } #endif /* #if !(defined CONFIG_EXYNOS4 || defined CONFIG_EXYNOS5) */ + i2c_ch_init(i2c, speed, slaveadd); + + bus->active = true; + bus->regs = i2c; +} +#endif /* CONFIG_SYS_I2C */ + +/* + * Poll the appropriate bit of the fifo status register until the interface is + * ready to process the next byte or timeout expires. + * + * In addition to the FIFO status register this function also polls the + * interrupt status register to be able to detect unexpected transaction + * completion. + * + * When FIFO is ready to process the next byte, this function returns I2C_OK. + * If in course of polling the INT_I2C assertion is detected, the function + * returns I2C_NOK. If timeout happens before any of the above conditions is + * met - the function returns I2C_NOK_TOUT; + + * @param i2c: pointer to the appropriate i2c register bank. + * @param rx_transfer: set to True if the receive transaction is in progress. + * @return: as described above. + */ +static unsigned hsi2c_poll_fifo(struct exynos5_hsi2c *i2c, bool rx_transfer) +{ + u32 fifo_bit = rx_transfer ? HSI2C_RX_FIFO_EMPTY : HSI2C_TX_FIFO_FULL; + int i = HSI2C_TIMEOUT_US; + + while (readl(&i2c->usi_fifo_stat) & fifo_bit) { + if (readl(&i2c->usi_int_stat) & HSI2C_INT_I2C_EN) { + /* + * There is a chance that assertion of + * HSI2C_INT_I2C_EN and deassertion of + * HSI2C_RX_FIFO_EMPTY happen simultaneously. Let's + * give FIFO status priority and check it one more + * time before reporting interrupt. The interrupt will + * be reported next time this function is called. + */ + if (rx_transfer && + !(readl(&i2c->usi_fifo_stat) & fifo_bit)) + break; + return I2C_NOK; + } + if (!i--) { + debug("%s: FIFO polling timeout!\n", __func__); + return I2C_NOK_TOUT; + } + udelay(1); + } + return I2C_OK; +} + +/* + * Preapre hsi2c transaction, either read or write. + * + * Set up transfer as described in section 27.5.1.2 'I2C Channel Auto Mode' of + * the 5420 UM. + * + * @param i2c: pointer to the appropriate i2c register bank. + * @param chip: slave address on the i2c bus (with read/write bit exlcuded) + * @param len: number of bytes expected to be sent or received + * @param rx_transfer: set to true for receive transactions + * @param: issue_stop: set to true if i2c stop condition should be generated + * after this transaction. + * @return: I2C_NOK_TOUT in case the bus remained busy for HSI2C_TIMEOUT_US, + * I2C_OK otherwise. + */ +static int hsi2c_prepare_transaction(struct exynos5_hsi2c *i2c, + u8 chip, + u16 len, + bool rx_transfer, + bool issue_stop) +{ + u32 conf; + + conf = len | HSI2C_MASTER_RUN; + + if (issue_stop) + conf |= HSI2C_STOP_AFTER_TRANS; + + /* Clear to enable Timeout */ + writel(readl(&i2c->usi_timeout) & ~HSI2C_TIMEOUT_EN, &i2c->usi_timeout); + + /* Set slave address */ + writel(HSI2C_SLV_ADDR_MAS(chip), &i2c->i2c_addr); + + if (rx_transfer) { + /* i2c master, read transaction */ + writel((HSI2C_RXCHON | HSI2C_FUNC_MODE_I2C | HSI2C_MASTER), + &i2c->usi_ctl); + + /* read up to len bytes, stop after transaction is finished */ + writel(conf | HSI2C_READ_WRITE, &i2c->usi_auto_conf); + } else { + /* i2c master, write transaction */ + writel((HSI2C_TXCHON | HSI2C_FUNC_MODE_I2C | HSI2C_MASTER), + &i2c->usi_ctl); + + /* write up to len bytes, stop after transaction is finished */ + writel(conf, &i2c->usi_auto_conf); + } + + /* Reset all pending interrupt status bits we care about, if any */ + writel(HSI2C_INT_I2C_EN, &i2c->usi_int_stat); + + return I2C_OK; +} + +/* + * Wait while i2c bus is settling down (mostly stop gets completed). + */ +static int hsi2c_wait_while_busy(struct exynos5_hsi2c *i2c) +{ + int i = HSI2C_TIMEOUT_US; + + while (readl(&i2c->usi_trans_status) & HSI2C_MASTER_BUSY) { + if (!i--) { + debug("%s: bus busy\n", __func__); + return I2C_NOK_TOUT; + } + udelay(1); + } + return I2C_OK; +} + +static int hsi2c_write(struct exynos5_hsi2c *i2c, + unsigned char chip, + unsigned char addr[], + unsigned char alen, + unsigned char data[], + unsigned short len, + bool issue_stop) +{ + int i, rv = 0; + + if (!(len + alen)) { + /* Writes of zero length not supported in auto mode. */ + debug("%s: zero length writes not supported\n", __func__); + return I2C_NOK; + } + + rv = hsi2c_prepare_transaction + (i2c, chip, len + alen, false, issue_stop); + if (rv != I2C_OK) + return rv; + + /* Move address, if any, and the data, if any, into the FIFO. */ + for (i = 0; i < alen; i++) { + rv = hsi2c_poll_fifo(i2c, false); + if (rv != I2C_OK) { + debug("%s: address write failed\n", __func__); + goto write_error; + } + writel(addr[i], &i2c->usi_txdata); + } + + for (i = 0; i < len; i++) { + rv = hsi2c_poll_fifo(i2c, false); + if (rv != I2C_OK) { + debug("%s: data write failed\n", __func__); + goto write_error; + } + writel(data[i], &i2c->usi_txdata); + } + + rv = hsi2c_wait_for_trx(i2c); + + write_error: + if (issue_stop) { + int tmp_ret = hsi2c_wait_while_busy(i2c); + if (rv == I2C_OK) + rv = tmp_ret; + } + + writel(HSI2C_FUNC_MODE_I2C, &i2c->usi_ctl); /* done */ + return rv; +} + +static int hsi2c_read(struct exynos5_hsi2c *i2c, + unsigned char chip, + unsigned char addr[], + unsigned char alen, + unsigned char data[], + unsigned short len) +{ + int i, rv, tmp_ret; + bool drop_data = false; + + if (!len) { + /* Reads of zero length not supported in auto mode. */ + debug("%s: zero length read adjusted\n", __func__); + drop_data = true; + len = 1; + } + + if (alen) { + /* Internal register adress needs to be written first. */ + rv = hsi2c_write(i2c, chip, addr, alen, NULL, 0, false); + if (rv != I2C_OK) + return rv; + } + + rv = hsi2c_prepare_transaction(i2c, chip, len, true, true); + + if (rv != I2C_OK) + return rv; + + for (i = 0; i < len; i++) { + rv = hsi2c_poll_fifo(i2c, true); + if (rv != I2C_OK) + goto read_err; + if (drop_data) + continue; + data[i] = readl(&i2c->usi_rxdata); + } + + rv = hsi2c_wait_for_trx(i2c); + + read_err: + tmp_ret = hsi2c_wait_while_busy(i2c); + if (rv == I2C_OK) + rv = tmp_ret; + + writel(HSI2C_FUNC_MODE_I2C, &i2c->usi_ctl); /* done */ + return rv; +} + +#ifdef CONFIG_SYS_I2C +static unsigned int s3c24x0_i2c_set_bus_speed(struct i2c_adapter *adap, + unsigned int speed) +#else +static int s3c24x0_i2c_set_bus_speed(struct udevice *dev, unsigned int speed) +#endif +{ + struct s3c24x0_i2c_bus *i2c_bus; + +#ifdef CONFIG_SYS_I2C + i2c_bus = get_bus(adap->hwadapnr); + if (!i2c_bus) + return -EFAULT; +#else + i2c_bus = dev_get_priv(dev); +#endif + i2c_bus->clock_frequency = speed; + + if (i2c_bus->is_highspeed) { + if (hsi2c_get_clk_details(i2c_bus)) + return -EFAULT; + hsi2c_ch_init(i2c_bus); + } else { + i2c_ch_init(i2c_bus->regs, i2c_bus->clock_frequency, + CONFIG_SYS_I2C_S3C24X0_SLAVE); + } + + return 0; } /* @@ -276,7 +760,8 @@ static int i2c_transfer(struct s3c24x0_i2c *i2c, unsigned char data[], unsigned short data_len) { - int i, result; + int i = 0, result; + ulong start_time = get_timer(0); if (data == 0 || data_len == 0) { /*Don't support data transfer of no length or to address 0 */ @@ -284,128 +769,78 @@ static int i2c_transfer(struct s3c24x0_i2c *i2c, return I2C_NOK; } - /* Check I2C bus idle */ - i = I2C_TIMEOUT * 1000; - while ((readl(&i2c->iicstat) & I2CSTAT_BSY) && (i > 0)) { - udelay(1000); - i--; + while (readl(&i2c->iicstat) & I2CSTAT_BSY) { + if (get_timer(start_time) > I2C_TIMEOUT_MS) + return I2C_NOK_TOUT; } - if (readl(&i2c->iicstat) & I2CSTAT_BSY) - return I2C_NOK_TOUT; - writel(readl(&i2c->iiccon) | I2CCON_ACKGEN, &i2c->iiccon); - result = I2C_OK; - switch (cmd_type) { - case I2C_WRITE: - if (addr && addr_len) { - writel(chip, &i2c->iicds); - /* send START */ - writel(I2C_MODE_MT | I2C_TXRX_ENA | I2C_START_STOP, - &i2c->iicstat); - i = 0; - while ((i < addr_len) && (result == I2C_OK)) { - result = WaitForXfer(i2c); - writel(addr[i], &i2c->iicds); - ReadWriteByte(i2c); - i++; - } - i = 0; - while ((i < data_len) && (result == I2C_OK)) { - result = WaitForXfer(i2c); - writel(data[i], &i2c->iicds); - ReadWriteByte(i2c); - i++; - } - } else { - writel(chip, &i2c->iicds); - /* send START */ - writel(I2C_MODE_MT | I2C_TXRX_ENA | I2C_START_STOP, - &i2c->iicstat); - i = 0; - while ((i < data_len) && (result == I2C_OK)) { - result = WaitForXfer(i2c); - writel(data[i], &i2c->iicds); - ReadWriteByte(i2c); - i++; - } + /* Get the slave chip address going */ + writel(chip, &i2c->iicds); + if ((cmd_type == I2C_WRITE) || (addr && addr_len)) + writel(I2C_MODE_MT | I2C_TXRX_ENA | I2C_START_STOP, + &i2c->iicstat); + else + writel(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)) { + writel(addr[i++], &i2c->iicds); + read_write_byte(i2c); + result = WaitForXfer(i2c); } + i = 0; + if (result != I2C_OK) + goto bailout; + } - if (result == I2C_OK) + switch (cmd_type) { + case I2C_WRITE: + while ((i < data_len) && (result == I2C_OK)) { + writel(data[i++], &i2c->iicds); + read_write_byte(i2c); result = WaitForXfer(i2c); - - /* send STOP */ - writel(I2C_MODE_MT | I2C_TXRX_ENA, &i2c->iicstat); - ReadWriteByte(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. + */ writel(chip, &i2c->iicds); - /* send START */ - writel(I2C_MODE_MT | I2C_TXRX_ENA | I2C_START_STOP, - &i2c->iicstat); - result = WaitForXfer(i2c); - if (IsACK(i2c)) { - i = 0; - while ((i < addr_len) && (result == I2C_OK)) { - writel(addr[i], &i2c->iicds); - ReadWriteByte(i2c); - result = WaitForXfer(i2c); - i++; - } - - writel(chip, &i2c->iicds); - /* resend START */ - writel(I2C_MODE_MR | I2C_TXRX_ENA | - I2C_START_STOP, &i2c->iicstat); - ReadWriteByte(i2c); - result = WaitForXfer(i2c); - i = 0; - while ((i < data_len) && (result == I2C_OK)) { - /* disable ACK for final READ */ - if (i == data_len - 1) - writel(readl(&i2c->iiccon) - & ~I2CCON_ACKGEN, - &i2c->iiccon); - ReadWriteByte(i2c); - result = WaitForXfer(i2c); - data[i] = readl(&i2c->iicds); - i++; - } - } else { - result = I2C_NACK; - } - } else { - writel(chip, &i2c->iicds); - /* send START */ + /* Generate a re-START. */ writel(I2C_MODE_MR | I2C_TXRX_ENA | I2C_START_STOP, &i2c->iicstat); + read_write_byte(i2c); result = WaitForXfer(i2c); - if (IsACK(i2c)) { - i = 0; - while ((i < data_len) && (result == I2C_OK)) { - /* disable ACK for final READ */ - if (i == data_len - 1) - writel(readl(&i2c->iiccon) & - ~I2CCON_ACKGEN, - &i2c->iiccon); - ReadWriteByte(i2c); - result = WaitForXfer(i2c); - data[i] = readl(&i2c->iicds); - i++; - } - } else { - result = I2C_NACK; - } + if (result != I2C_OK) + goto bailout; } - /* send STOP */ - writel(I2C_MODE_MR | I2C_TXRX_ENA, &i2c->iicstat); - ReadWriteByte(i2c); + while ((i < data_len) && (result == I2C_OK)) { + /* disable ACK for final READ */ + if (i == data_len - 1) + writel(readl(&i2c->iiccon) + & ~I2CCON_ACKGEN, + &i2c->iiccon); + read_write_byte(i2c); + result = WaitForXfer(i2c); + data[i++] = readl(&i2c->iicds); + } + if (result == I2C_NACK) + result = I2C_OK; /* Normal terminated read. */ break; default: @@ -414,15 +849,31 @@ static int i2c_transfer(struct s3c24x0_i2c *i2c, break; } +bailout: + /* Send STOP. */ + writel(I2C_MODE_MR | I2C_TXRX_ENA, &i2c->iicstat); + read_write_byte(i2c); + return result; } -int i2c_probe(uchar chip) +#ifdef CONFIG_SYS_I2C +static int s3c24x0_i2c_probe(struct i2c_adapter *adap, uchar chip) +#else +static int s3c24x0_i2c_probe(struct udevice *dev, uint chip, uint chip_flags) +#endif { - struct s3c24x0_i2c *i2c; + struct s3c24x0_i2c_bus *i2c_bus; uchar buf[1]; + int ret; - i2c = get_base_i2c(); +#ifdef CONFIG_SYS_I2C + i2c_bus = get_bus(adap->hwadapnr); + if (!i2c_bus) + return -EFAULT; +#else + i2c_bus = dev_get_priv(dev); +#endif buf[0] = 0; /* @@ -430,18 +881,32 @@ int i2c_probe(uchar chip) * address was ed (i.e. there was a chip at that address which * drove the data line low). */ - return i2c_transfer(i2c, I2C_READ, chip << 1, 0, 0, buf, 1) != I2C_OK; + if (i2c_bus->is_highspeed) { + ret = hsi2c_read(i2c_bus->hsregs, + chip, 0, 0, buf, 1); + } else { + ret = i2c_transfer(i2c_bus->regs, + I2C_READ, chip << 1, 0, 0, buf, 1); + } + + return ret != I2C_OK; } -int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len) +#ifdef CONFIG_SYS_I2C +static int s3c24x0_i2c_read(struct i2c_adapter *adap, uchar chip, uint addr, + int alen, uchar *buffer, int len) { - struct s3c24x0_i2c *i2c; + struct s3c24x0_i2c_bus *i2c_bus; uchar xaddr[4]; int ret; + i2c_bus = get_bus(adap->hwadapnr); + if (!i2c_bus) + return -EFAULT; + if (alen > 4) { debug("I2C read: addr len %d not supported\n", alen); - return 1; + return -EADDRNOTAVAIL; } if (alen > 0) { @@ -467,24 +932,36 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len) chip |= ((addr >> (alen * 8)) & CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW); #endif - i2c = get_base_i2c(); - ret = i2c_transfer(i2c, I2C_READ, chip << 1, &xaddr[4 - alen], alen, - buffer, len); - if (ret != 0) { - debug("I2c read: failed %d\n", ret); - return 1; + if (i2c_bus->is_highspeed) + ret = hsi2c_read(i2c_bus->hsregs, chip, &xaddr[4 - alen], + alen, buffer, len); + else + ret = i2c_transfer(i2c_bus->regs, I2C_READ, chip << 1, + &xaddr[4 - alen], alen, buffer, len); + + if (ret) { + if (i2c_bus->is_highspeed) + exynos5_i2c_reset(i2c_bus); + debug("I2c read failed %d\n", ret); + return -EIO; } return 0; } -int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len) +static int s3c24x0_i2c_write(struct i2c_adapter *adap, uchar chip, uint addr, + int alen, uchar *buffer, int len) { - struct s3c24x0_i2c *i2c; + struct s3c24x0_i2c_bus *i2c_bus; uchar xaddr[4]; + int ret; + + i2c_bus = get_bus(adap->hwadapnr); + if (!i2c_bus) + return -EFAULT; if (alen > 4) { debug("I2C write: addr len %d not supported\n", alen); - return 1; + return -EINVAL; } if (alen > 0) { @@ -509,81 +986,480 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len) chip |= ((addr >> (alen * 8)) & CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW); #endif - i2c = get_base_i2c(); - return (i2c_transfer - (i2c, I2C_WRITE, chip << 1, &xaddr[4 - alen], alen, buffer, - len) != 0); + if (i2c_bus->is_highspeed) + ret = hsi2c_write(i2c_bus->hsregs, chip, &xaddr[4 - alen], + alen, buffer, len, true); + else + ret = i2c_transfer(i2c_bus->regs, I2C_WRITE, chip << 1, + &xaddr[4 - alen], alen, buffer, len); + + if (ret != 0) { + if (i2c_bus->is_highspeed) + exynos5_i2c_reset(i2c_bus); + return 1; + } else { + return 0; + } } -#ifdef CONFIG_OF_CONTROL -void board_i2c_init(const void *blob) +#if CONFIG_IS_ENABLED(OF_CONTROL) +static void process_nodes(const void *blob, int node_list[], int count, + int is_highspeed) { - int node_list[CONFIG_MAX_I2C_NUM]; - int count, i; - - count = fdtdec_find_aliases_for_id(blob, "i2c", - COMPAT_SAMSUNG_S3C2440_I2C, node_list, - CONFIG_MAX_I2C_NUM); + struct s3c24x0_i2c_bus *bus; + int i, flags; for (i = 0; i < count; i++) { - struct s3c24x0_i2c_bus *bus; int node = node_list[i]; if (node <= 0) continue; + bus = &i2c_bus[i]; - bus->regs = (struct s3c24x0_i2c *) - fdtdec_get_addr(blob, node, "reg"); + bus->active = true; + bus->is_highspeed = is_highspeed; + + if (is_highspeed) { + flags = PINMUX_FLAG_HS_MODE; + bus->hsregs = (struct exynos5_hsi2c *) + fdtdec_get_addr(blob, node, "reg"); + } else { + flags = 0; + bus->regs = (struct s3c24x0_i2c *) + fdtdec_get_addr(blob, node, "reg"); + } + bus->id = pinmux_decode_periph_id(blob, node); + bus->clock_frequency = fdtdec_get_int(blob, node, + "clock-frequency", + CONFIG_SYS_I2C_S3C24X0_SPEED); bus->node = node; - bus->bus_num = i2c_busses++; - exynos_pinmux_config(bus->id, 0); + bus->bus_num = i; + exynos_pinmux_config(bus->id, flags); + + /* Mark position as used */ + node_list[i] = -1; } } -static struct s3c24x0_i2c_bus *get_bus(unsigned int bus_idx) +void board_i2c_init(const void *blob) { - if (bus_idx < i2c_busses) - return &i2c_bus[bus_idx]; + int node_list[CONFIG_MAX_I2C_NUM]; + int count; - debug("Undefined bus: %d\n", bus_idx); - return NULL; + /* First get the normal i2c ports */ + count = fdtdec_find_aliases_for_id(blob, "i2c", + COMPAT_SAMSUNG_S3C2440_I2C, node_list, + CONFIG_MAX_I2C_NUM); + process_nodes(blob, node_list, count, 0); + + /* Now look for high speed i2c ports */ + count = fdtdec_find_aliases_for_id(blob, "i2c", + COMPAT_SAMSUNG_EXYNOS5_I2C, node_list, + CONFIG_MAX_I2C_NUM); + process_nodes(blob, node_list, count, 1); } int i2c_get_bus_num_fdt(int node) { int i; - for (i = 0; i < i2c_busses; i++) { + for (i = 0; i < ARRAY_SIZE(i2c_bus); i++) { if (node == i2c_bus[i].node) return i; } debug("%s: Can't find any matched I2C bus\n", __func__); - return -1; + return -EINVAL; } int i2c_reset_port_fdt(const void *blob, int node) { - struct s3c24x0_i2c_bus *i2c; + struct s3c24x0_i2c_bus *i2c_bus; int bus; bus = i2c_get_bus_num_fdt(node); if (bus < 0) { debug("could not get bus for node %d\n", node); - return -1; + return bus; } - i2c = get_bus(bus); - if (!i2c) { - debug("get_bus() failed for node node %d\n", node); - return -1; + i2c_bus = get_bus(bus); + if (!i2c_bus) { + debug("get_bus() failed for node %d\n", node); + return -EFAULT; } - i2c_ch_init(i2c->regs, CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE); + if (i2c_bus->is_highspeed) { + if (hsi2c_get_clk_details(i2c_bus)) + return -EINVAL; + hsi2c_ch_init(i2c_bus); + } else { + i2c_ch_init(i2c_bus->regs, i2c_bus->clock_frequency, + CONFIG_SYS_I2C_S3C24X0_SLAVE); + } return 0; } +#endif /* CONFIG_IS_ENABLED(OF_CONTROL) */ + +#ifdef CONFIG_EXYNOS5 +static void exynos_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr) +{ + /* This will override the speed selected in the fdt for that port */ + debug("i2c_init(speed=%u, slaveaddr=0x%x)\n", speed, slaveaddr); + if (i2c_set_bus_speed(speed)) + error("i2c_init: failed to init bus for speed = %d", speed); +} +#endif /* CONFIG_EXYNOS5 */ + +/* + * Register s3c24x0 i2c adapters + */ +#if defined(CONFIG_EXYNOS5420) +U_BOOT_I2C_ADAP_COMPLETE(i2c00, s3c24x0_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 0) +U_BOOT_I2C_ADAP_COMPLETE(i2c01, s3c24x0_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 1) +U_BOOT_I2C_ADAP_COMPLETE(i2c02, s3c24x0_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 2) +U_BOOT_I2C_ADAP_COMPLETE(i2c03, exynos_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 3) +U_BOOT_I2C_ADAP_COMPLETE(i2c04, exynos_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 4) +U_BOOT_I2C_ADAP_COMPLETE(i2c05, exynos_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 5) +U_BOOT_I2C_ADAP_COMPLETE(i2c06, exynos_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 6) +U_BOOT_I2C_ADAP_COMPLETE(i2c07, exynos_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 7) +U_BOOT_I2C_ADAP_COMPLETE(i2c08, exynos_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 8) +U_BOOT_I2C_ADAP_COMPLETE(i2c09, exynos_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 9) +U_BOOT_I2C_ADAP_COMPLETE(i2c10, exynos_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 10) +#elif defined(CONFIG_EXYNOS5250) +U_BOOT_I2C_ADAP_COMPLETE(i2c00, exynos_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 0) +U_BOOT_I2C_ADAP_COMPLETE(i2c01, exynos_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 1) +U_BOOT_I2C_ADAP_COMPLETE(i2c02, exynos_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 2) +U_BOOT_I2C_ADAP_COMPLETE(i2c03, exynos_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 3) +U_BOOT_I2C_ADAP_COMPLETE(i2c04, s3c24x0_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 4) +U_BOOT_I2C_ADAP_COMPLETE(i2c05, s3c24x0_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 5) +U_BOOT_I2C_ADAP_COMPLETE(i2c06, s3c24x0_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 6) +U_BOOT_I2C_ADAP_COMPLETE(i2c07, s3c24x0_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 7) +U_BOOT_I2C_ADAP_COMPLETE(i2c08, s3c24x0_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 8) +U_BOOT_I2C_ADAP_COMPLETE(i2c09, s3c24x0_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 9) +U_BOOT_I2C_ADAP_COMPLETE(s3c10, s3c24x0_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 10) +#elif defined(CONFIG_EXYNOS4) +U_BOOT_I2C_ADAP_COMPLETE(i2c00, s3c24x0_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 0) +U_BOOT_I2C_ADAP_COMPLETE(i2c01, s3c24x0_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 1) +U_BOOT_I2C_ADAP_COMPLETE(i2c02, s3c24x0_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 2) +U_BOOT_I2C_ADAP_COMPLETE(i2c03, s3c24x0_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 3) +U_BOOT_I2C_ADAP_COMPLETE(i2c04, s3c24x0_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 4) +U_BOOT_I2C_ADAP_COMPLETE(i2c05, s3c24x0_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 5) +U_BOOT_I2C_ADAP_COMPLETE(i2c06, s3c24x0_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 6) +U_BOOT_I2C_ADAP_COMPLETE(i2c07, s3c24x0_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 7) +U_BOOT_I2C_ADAP_COMPLETE(i2c08, s3c24x0_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 8) +#else +U_BOOT_I2C_ADAP_COMPLETE(s3c0, s3c24x0_i2c_init, s3c24x0_i2c_probe, + s3c24x0_i2c_read, s3c24x0_i2c_write, + s3c24x0_i2c_set_bus_speed, + CONFIG_SYS_I2C_S3C24X0_SPEED, + CONFIG_SYS_I2C_S3C24X0_SLAVE, 0) #endif +#endif /* CONFIG_SYS_I2C */ + +#ifdef CONFIG_DM_I2C +static int exynos_hs_i2c_xfer(struct udevice *dev, struct i2c_msg *msg, + int nmsgs) +{ + struct s3c24x0_i2c_bus *i2c_bus = dev_get_priv(dev); + struct exynos5_hsi2c *hsregs = i2c_bus->hsregs; + int ret; -#endif /* CONFIG_HARD_I2C */ + for (; nmsgs > 0; nmsgs--, msg++) { + if (msg->flags & I2C_M_RD) { + ret = hsi2c_read(hsregs, msg->addr, 0, 0, msg->buf, + msg->len); + } else { + ret = hsi2c_write(hsregs, msg->addr, 0, 0, msg->buf, + msg->len, true); + } + if (ret) { + exynos5_i2c_reset(i2c_bus); + return -EREMOTEIO; + } + } + + return 0; +} + +static int s3c24x0_do_msg(struct s3c24x0_i2c_bus *i2c_bus, struct i2c_msg *msg, + int seq) +{ + struct s3c24x0_i2c *i2c = i2c_bus->regs; + bool is_read = msg->flags & I2C_M_RD; + uint status; + uint addr; + int ret, i; + + if (!seq) + setbits_le32(&i2c->iiccon, I2CCON_ACKGEN); + + /* Get the slave chip address going */ + addr = msg->addr << 1; + writel(addr, &i2c->iicds); + status = I2C_TXRX_ENA | I2C_START_STOP; + if (is_read) + status |= I2C_MODE_MR; + else + status |= I2C_MODE_MT; + writel(status, &i2c->iicstat); + if (seq) + read_write_byte(i2c); + + /* Wait for chip address to transmit */ + ret = WaitForXfer(i2c); + if (ret) + goto err; + + if (is_read) { + for (i = 0; !ret && i < msg->len; i++) { + /* disable ACK for final READ */ + if (i == msg->len - 1) + clrbits_le32(&i2c->iiccon, I2CCON_ACKGEN); + read_write_byte(i2c); + ret = WaitForXfer(i2c); + msg->buf[i] = readl(&i2c->iicds); + } + if (ret == I2C_NACK) + ret = I2C_OK; /* Normal terminated read */ + } else { + for (i = 0; !ret && i < msg->len; i++) { + writel(msg->buf[i], &i2c->iicds); + read_write_byte(i2c); + ret = WaitForXfer(i2c); + } + } + +err: + return ret; +} + +static int s3c24x0_i2c_xfer(struct udevice *dev, struct i2c_msg *msg, + int nmsgs) +{ + struct s3c24x0_i2c_bus *i2c_bus = dev_get_priv(dev); + struct s3c24x0_i2c *i2c = i2c_bus->regs; + ulong start_time; + int ret, i; + + start_time = get_timer(0); + while (readl(&i2c->iicstat) & I2CSTAT_BSY) { + if (get_timer(start_time) > I2C_TIMEOUT_MS) { + debug("Timeout\n"); + return -ETIMEDOUT; + } + } + + for (ret = 0, i = 0; !ret && i < nmsgs; i++) + ret = s3c24x0_do_msg(i2c_bus, &msg[i], i); + + /* Send STOP */ + writel(I2C_MODE_MR | I2C_TXRX_ENA, &i2c->iicstat); + read_write_byte(i2c); + + return ret ? -EREMOTEIO : 0; +} + +static int s3c_i2c_ofdata_to_platdata(struct udevice *dev) +{ + const void *blob = gd->fdt_blob; + struct s3c24x0_i2c_bus *i2c_bus = dev_get_priv(dev); + int node, flags; + + i2c_bus->is_highspeed = dev_get_driver_data(dev); + node = dev->of_offset; + + if (i2c_bus->is_highspeed) { + flags = PINMUX_FLAG_HS_MODE; + i2c_bus->hsregs = (struct exynos5_hsi2c *)dev_get_addr(dev); + } else { + flags = 0; + i2c_bus->regs = (struct s3c24x0_i2c *)dev_get_addr(dev); + } + + i2c_bus->id = pinmux_decode_periph_id(blob, node); + + i2c_bus->clock_frequency = fdtdec_get_int(blob, node, + "clock-frequency", 100000); + i2c_bus->node = node; + i2c_bus->bus_num = dev->seq; + + exynos_pinmux_config(i2c_bus->id, flags); + + i2c_bus->active = true; + + return 0; +} + +static const struct dm_i2c_ops s3c_i2c_ops = { + .xfer = s3c24x0_i2c_xfer, + .probe_chip = s3c24x0_i2c_probe, + .set_bus_speed = s3c24x0_i2c_set_bus_speed, +}; + +static const struct udevice_id s3c_i2c_ids[] = { + { .compatible = "samsung,s3c2440-i2c", .data = EXYNOS_I2C_STD }, + { } +}; + +U_BOOT_DRIVER(i2c_s3c) = { + .name = "i2c_s3c", + .id = UCLASS_I2C, + .of_match = s3c_i2c_ids, + .ofdata_to_platdata = s3c_i2c_ofdata_to_platdata, + .per_child_auto_alloc_size = sizeof(struct dm_i2c_chip), + .priv_auto_alloc_size = sizeof(struct s3c24x0_i2c_bus), + .ops = &s3c_i2c_ops, +}; + +/* + * TODO(sjg@chromium.org): Move this to a separate file when everything uses + * driver model + */ +static const struct dm_i2c_ops exynos_hs_i2c_ops = { + .xfer = exynos_hs_i2c_xfer, + .probe_chip = s3c24x0_i2c_probe, + .set_bus_speed = s3c24x0_i2c_set_bus_speed, +}; + +static const struct udevice_id exynos_hs_i2c_ids[] = { + { .compatible = "samsung,exynos5-hsi2c", .data = EXYNOS_I2C_HS }, + { } +}; + +U_BOOT_DRIVER(hs_i2c) = { + .name = "i2c_s3c_hs", + .id = UCLASS_I2C, + .of_match = exynos_hs_i2c_ids, + .ofdata_to_platdata = s3c_i2c_ofdata_to_platdata, + .per_child_auto_alloc_size = sizeof(struct dm_i2c_chip), + .priv_auto_alloc_size = sizeof(struct s3c24x0_i2c_bus), + .ops = &exynos_hs_i2c_ops, +}; +#endif /* CONFIG_DM_I2C */