Add support for the Kona I2C controller found on Broadcom mobile SoCs.
Signed-off-by: Darwin Rambo drambo@broadcom.com Reviewed-by: Steve Rae srae@broadcom.com Reviewed-by: Tim Kryger tkryger@linaro.org --- drivers/i2c/Makefile | 1 + drivers/i2c/kona_i2c.c | 730 ++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 731 insertions(+) create mode 100644 drivers/i2c/kona_i2c.c
diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile index fa3a875..36d5e5f 100644 --- a/drivers/i2c/Makefile +++ b/drivers/i2c/Makefile @@ -18,6 +18,7 @@ obj-$(CONFIG_SH_SH7734_I2C) += sh_sh7734_i2c.o obj-$(CONFIG_SYS_I2C) += i2c_core.o obj-$(CONFIG_SYS_I2C_FSL) += fsl_i2c.o obj-$(CONFIG_SYS_I2C_FTI2C010) += fti2c010.o +obj-$(CONFIG_SYS_I2C_KONA) += kona_i2c.o obj-$(CONFIG_SYS_I2C_MXC) += mxc_i2c.o obj-$(CONFIG_SYS_I2C_OMAP24XX) += omap24xx_i2c.o obj-$(CONFIG_SYS_I2C_OMAP34XX) += omap24xx_i2c.o diff --git a/drivers/i2c/kona_i2c.c b/drivers/i2c/kona_i2c.c new file mode 100644 index 0000000..049457a --- /dev/null +++ b/drivers/i2c/kona_i2c.c @@ -0,0 +1,730 @@ +/***************************************************************************** +* +* Copyright 2013 Broadcom Corporation. All rights reserved. +* +* SPDX-License-Identifier: GPL-2.0+ +* +*****************************************************************************/ + +#include <common.h> +#include <asm/io.h> +#include <asm/errno.h> +#include <asm/arch/sysmap.h> +#include <asm/kona-common/clk.h> +#include <i2c.h> + +/* Hardware register offsets and field defintions */ +#define CS_OFFSET 0x00000020 +#define CS_ACK_SHIFT 3 +#define CS_ACK_MASK 0x00000008 +#define CS_ACK_CMD_GEN_START 0x00000000 +#define CS_ACK_CMD_GEN_RESTART 0x00000001 +#define CS_CMD_SHIFT 1 +#define CS_CMD_CMD_NO_ACTION 0x00000000 +#define CS_CMD_CMD_START_RESTART 0x00000001 +#define CS_CMD_CMD_STOP 0x00000002 +#define CS_EN_SHIFT 0 +#define CS_EN_CMD_ENABLE_BSC 0x00000001 + +#define TIM_OFFSET 0x00000024 +#define TIM_PRESCALE_SHIFT 6 +#define TIM_P_SHIFT 3 +#define TIM_NO_DIV_SHIFT 2 +#define TIM_DIV_SHIFT 0 + +#define DAT_OFFSET 0x00000028 + +#define TOUT_OFFSET 0x0000002c + +#define TXFCR_OFFSET 0x0000003c +#define TXFCR_FIFO_FLUSH_MASK 0x00000080 +#define TXFCR_FIFO_EN_MASK 0x00000040 + +#define IER_OFFSET 0x00000044 +#define IER_READ_COMPLETE_INT_MASK 0x00000010 +#define IER_I2C_INT_EN_MASK 0x00000008 +#define IER_FIFO_INT_EN_MASK 0x00000002 +#define IER_NOACK_EN_MASK 0x00000001 + +#define ISR_OFFSET 0x00000048 +#define ISR_RESERVED_MASK 0xffffff60 +#define ISR_CMDBUSY_MASK 0x00000080 +#define ISR_READ_COMPLETE_MASK 0x00000010 +#define ISR_SES_DONE_MASK 0x00000008 +#define ISR_ERR_MASK 0x00000004 +#define ISR_TXFIFOEMPTY_MASK 0x00000002 +#define ISR_NOACK_MASK 0x00000001 + +#define CLKEN_OFFSET 0x0000004c +#define CLKEN_AUTOSENSE_OFF_MASK 0x00000080 +#define CLKEN_M_SHIFT 4 +#define CLKEN_N_SHIFT 1 +#define CLKEN_CLKEN_MASK 0x00000001 + +#define FIFO_STATUS_OFFSET 0x00000054 +#define FIFO_STATUS_RXFIFO_EMPTY_MASK 0x00000004 +#define FIFO_STATUS_TXFIFO_EMPTY_MASK 0x00000010 + +#define HSTIM_OFFSET 0x00000058 +#define HSTIM_HS_MODE_MASK 0x00008000 +#define HSTIM_HS_HOLD_SHIFT 10 +#define HSTIM_HS_HIGH_PHASE_SHIFT 5 +#define HSTIM_HS_SETUP_SHIFT 0 + +#define PADCTL_OFFSET 0x0000005c +#define PADCTL_PAD_OUT_EN_MASK 0x00000004 + +#define RXFCR_OFFSET 0x00000068 +#define RXFCR_NACK_EN_SHIFT 7 +#define RXFCR_READ_COUNT_SHIFT 0 +#define RXFIFORDOUT_OFFSET 0x0000006c + +/* Locally used constants */ +#define MAX_RX_FIFO_SIZE 64U /* bytes */ +#define MAX_TX_FIFO_SIZE 64U /* bytes */ + +#define I2C_TIMEOUT 100000 /* usecs */ + +#define WAIT_INT_CHK 100 /* usecs */ +#if I2C_TIMEOUT % WAIT_INT_CHK +#error I2C_TIMEOUT must be a multiple of WAIT_INT_CHK +#endif + +/* Operations that can be commanded to the controller */ +enum bcm_kona_cmd_t { + BCM_CMD_NOACTION = 0, + BCM_CMD_START, + BCM_CMD_RESTART, + BCM_CMD_STOP, +}; + +enum bus_speed_index { + BCM_SPD_100K = 0, + BCM_SPD_400K, + BCM_SPD_1MHZ, +}; + +/* Internal divider settings for standard mode, fast mode and fast mode plus */ +struct bus_speed_cfg { + uint8_t time_m; /* Number of cycles for setup time */ + uint8_t time_n; /* Number of cycles for hold time */ + uint8_t prescale; /* Prescale divider */ + uint8_t time_p; /* Timing coefficient */ + uint8_t no_div; /* Disable clock divider */ + uint8_t time_div; /* Post-prescale divider */ +}; + +static const struct bus_speed_cfg std_cfg_table[] = { + [BCM_SPD_100K] = {0x01, 0x01, 0x03, 0x06, 0x00, 0x02}, + [BCM_SPD_400K] = {0x05, 0x01, 0x03, 0x05, 0x01, 0x02}, + [BCM_SPD_1MHZ] = {0x01, 0x01, 0x03, 0x01, 0x01, 0x03}, +}; + +struct bcm_kona_i2c_dev { + void *base; + uint speed; + const struct bus_speed_cfg *std_cfg; +}; + +/* Keep these two defines in sync */ +#define DEF_SPD 100000 +#define DEF_SPD_ENUM BCM_SPD_100K + +#define DEF_DEVICE(num) \ +{(void *)CONFIG_SYS_I2C_BASE##num, DEF_SPD, &std_cfg_table[DEF_SPD_ENUM]} + +static struct bcm_kona_i2c_dev g_i2c_devs[CONFIG_SYS_MAX_I2C_BUS] = { +#ifdef CONFIG_SYS_I2C_BASE0 + DEF_DEVICE(0), +#endif +#ifdef CONFIG_SYS_I2C_BASE1 + DEF_DEVICE(1), +#endif +#ifdef CONFIG_SYS_I2C_BASE2 + DEF_DEVICE(2), +#endif +#ifdef CONFIG_SYS_I2C_BASE3 + DEF_DEVICE(3), +#endif +#ifdef CONFIG_SYS_I2C_BASE4 + DEF_DEVICE(4), +#endif +#ifdef CONFIG_SYS_I2C_BASE5 + DEF_DEVICE(5), +#endif +}; + +#define I2C_M_TEN 0x0010 /* ten bit address */ +#define I2C_M_RD 0x0001 /* read data */ +#define I2C_M_NOSTART 0x4000 /* no restart between msgs */ + +struct i2c_msg { + uint16_t addr; + uint16_t flags; + uint16_t len; + uint8_t *buf; +}; + +static void bcm_kona_i2c_send_cmd_to_ctrl(struct bcm_kona_i2c_dev *dev, + enum bcm_kona_cmd_t cmd) +{ + debug("%s, %d\n", __func__, cmd); + + switch (cmd) { + case BCM_CMD_NOACTION: + writel((CS_CMD_CMD_NO_ACTION << CS_CMD_SHIFT) | + (CS_EN_CMD_ENABLE_BSC << CS_EN_SHIFT), + dev->base + CS_OFFSET); + break; + + case BCM_CMD_START: + writel((CS_ACK_CMD_GEN_START << CS_ACK_SHIFT) | + (CS_CMD_CMD_START_RESTART << CS_CMD_SHIFT) | + (CS_EN_CMD_ENABLE_BSC << CS_EN_SHIFT), + dev->base + CS_OFFSET); + break; + + case BCM_CMD_RESTART: + writel((CS_ACK_CMD_GEN_RESTART << CS_ACK_SHIFT) | + (CS_CMD_CMD_START_RESTART << CS_CMD_SHIFT) | + (CS_EN_CMD_ENABLE_BSC << CS_EN_SHIFT), + dev->base + CS_OFFSET); + break; + + case BCM_CMD_STOP: + writel((CS_CMD_CMD_STOP << CS_CMD_SHIFT) | + (CS_EN_CMD_ENABLE_BSC << CS_EN_SHIFT), + dev->base + CS_OFFSET); + break; + + default: + printf("Unknown command %d\n", cmd); + } +} + +static void bcm_kona_i2c_enable_clock(struct bcm_kona_i2c_dev *dev) +{ + writel(readl(dev->base + CLKEN_OFFSET) | CLKEN_CLKEN_MASK, + dev->base + CLKEN_OFFSET); +} + +static void bcm_kona_i2c_disable_clock(struct bcm_kona_i2c_dev *dev) +{ + writel(readl(dev->base + CLKEN_OFFSET) & ~CLKEN_CLKEN_MASK, + dev->base + CLKEN_OFFSET); +} + +/* Wait until at least one of the mask bit(s) are set */ +static unsigned long wait_for_int_timeout(struct bcm_kona_i2c_dev *dev, + unsigned long time_left, + uint32_t mask) +{ + uint32_t status; + + while (time_left) { + status = readl(dev->base + ISR_OFFSET); + + if ((status & ~ISR_RESERVED_MASK) == 0) { + debug("Bogus I2C interrupt 0x%x\n", status); + continue; + } + + /* Must flush the TX FIFO when NAK detected */ + if (status & ISR_NOACK_MASK) + writel(TXFCR_FIFO_FLUSH_MASK | TXFCR_FIFO_EN_MASK, + dev->base + TXFCR_OFFSET); + + writel(status & ~ISR_RESERVED_MASK, dev->base + ISR_OFFSET); + + if (status & mask) { + /* We are done since one of the mask bits are set */ + return time_left; + } + udelay(WAIT_INT_CHK); + time_left -= WAIT_INT_CHK; + } + return 0; +} + +/* Send command to I2C bus */ +static int bcm_kona_send_i2c_cmd(struct bcm_kona_i2c_dev *dev, + enum bcm_kona_cmd_t cmd) +{ + int rc = 0; + unsigned long time_left = I2C_TIMEOUT; + + /* Send the command */ + bcm_kona_i2c_send_cmd_to_ctrl(dev, cmd); + + /* Wait for transaction to finish or timeout */ + time_left = wait_for_int_timeout(dev, time_left, IER_I2C_INT_EN_MASK); + + if (!time_left) { + printf("controller timed out\n"); + rc = -ETIMEDOUT; + } + + /* Clear command */ + bcm_kona_i2c_send_cmd_to_ctrl(dev, BCM_CMD_NOACTION); + + return rc; +} + +/* Read a single RX FIFO worth of data from the i2c bus */ +static int bcm_kona_i2c_read_fifo_single(struct bcm_kona_i2c_dev *dev, + uint8_t *buf, unsigned int len, + unsigned int last_byte_nak) +{ + unsigned long time_left = I2C_TIMEOUT; + + /* Start the RX FIFO */ + writel((last_byte_nak << RXFCR_NACK_EN_SHIFT) | + (len << RXFCR_READ_COUNT_SHIFT), dev->base + RXFCR_OFFSET); + + /* Wait for FIFO read to complete */ + time_left = + wait_for_int_timeout(dev, time_left, IER_READ_COMPLETE_INT_MASK); + + if (!time_left) { + printf("RX FIFO time out\n"); + return -EREMOTEIO; + } + + /* Read data from FIFO */ + for (; len > 0; len--, buf++) + *buf = readl(dev->base + RXFIFORDOUT_OFFSET); + + return 0; +} + +/* Read any amount of data using the RX FIFO from the i2c bus */ +static int bcm_kona_i2c_read_fifo(struct bcm_kona_i2c_dev *dev, + struct i2c_msg *msg) +{ + unsigned int bytes_to_read = MAX_RX_FIFO_SIZE; + unsigned int last_byte_nak = 0; + unsigned int bytes_read = 0; + int rc; + + uint8_t *tmp_buf = msg->buf; + + while (bytes_read < msg->len) { + if (msg->len - bytes_read <= MAX_RX_FIFO_SIZE) { + last_byte_nak = 1; /* NAK last byte of transfer */ + bytes_to_read = msg->len - bytes_read; + } + + rc = bcm_kona_i2c_read_fifo_single(dev, tmp_buf, bytes_to_read, + last_byte_nak); + if (rc < 0) + return -EREMOTEIO; + + bytes_read += bytes_to_read; + tmp_buf += bytes_to_read; + } + + return 0; +} + +/* Write a single byte of data to the i2c bus */ +static int bcm_kona_i2c_write_byte(struct bcm_kona_i2c_dev *dev, uint8_t data, + unsigned int nak_expected) +{ + unsigned long time_left = I2C_TIMEOUT; + unsigned int nak_received; + + /* Clear pending session done interrupt */ + writel(ISR_SES_DONE_MASK, dev->base + ISR_OFFSET); + + /* Send one byte of data */ + writel(data, dev->base + DAT_OFFSET); + + time_left = wait_for_int_timeout(dev, time_left, IER_I2C_INT_EN_MASK); + + if (!time_left) { + debug("controller timed out\n"); + return -ETIMEDOUT; + } + + nak_received = readl(dev->base + CS_OFFSET) & CS_ACK_MASK ? 1 : 0; + + if (nak_received ^ nak_expected) { + debug("unexpected NAK/ACK\n"); + return -EREMOTEIO; + } + + return 0; +} + +/* Write a single TX FIFO worth of data to the i2c bus */ +static int bcm_kona_i2c_write_fifo_single(struct bcm_kona_i2c_dev *dev, + uint8_t *buf, unsigned int len) +{ + int k; + unsigned long time_left = I2C_TIMEOUT; + unsigned int fifo_status; + + /* Write data into FIFO */ + for (k = 0; k < len; k++) + writel(buf[k], (dev->base + DAT_OFFSET)); + + /* Wait for FIFO to empty */ + do { + time_left = + wait_for_int_timeout(dev, time_left, + (IER_FIFO_INT_EN_MASK | + IER_NOACK_EN_MASK)); + fifo_status = readl(dev->base + FIFO_STATUS_OFFSET); + } while (time_left && !(fifo_status & FIFO_STATUS_TXFIFO_EMPTY_MASK)); + + /* Check if there was a NAK */ + if (readl(dev->base + CS_OFFSET) & CS_ACK_MASK) { + printf("unexpected NAK\n"); + return -EREMOTEIO; + } + + /* Check if a timeout occured */ + if (!time_left) { + printf("completion timed out\n"); + return -EREMOTEIO; + } + + return 0; +} + +/* Write any amount of data using TX FIFO to the i2c bus */ +static int bcm_kona_i2c_write_fifo(struct bcm_kona_i2c_dev *dev, + struct i2c_msg *msg) +{ + unsigned int bytes_to_write = MAX_TX_FIFO_SIZE; + unsigned int bytes_written = 0; + int rc; + + uint8_t *tmp_buf = msg->buf; + + while (bytes_written < msg->len) { + if (msg->len - bytes_written <= MAX_TX_FIFO_SIZE) + bytes_to_write = msg->len - bytes_written; + + rc = bcm_kona_i2c_write_fifo_single(dev, tmp_buf, + bytes_to_write); + if (rc < 0) + return -EREMOTEIO; + + bytes_written += bytes_to_write; + tmp_buf += bytes_to_write; + } + + return 0; +} + +/* Send i2c address */ +static int bcm_kona_i2c_do_addr(struct bcm_kona_i2c_dev *dev, + struct i2c_msg *msg) +{ + unsigned char addr; + + if (msg->flags & I2C_M_TEN) { + /* First byte is 11110XX0 where XX is upper 2 bits */ + addr = 0xf0 | ((msg->addr & 0x300) >> 7); + if (bcm_kona_i2c_write_byte(dev, addr, 0) < 0) + return -EREMOTEIO; + + /* Second byte is the remaining 8 bits */ + addr = msg->addr & 0xff; + if (bcm_kona_i2c_write_byte(dev, addr, 0) < 0) + return -EREMOTEIO; + + if (msg->flags & I2C_M_RD) { + /* For read, send restart command */ + if (bcm_kona_send_i2c_cmd(dev, BCM_CMD_RESTART) < 0) + return -EREMOTEIO; + + /* Then re-send the first byte with the read bit set */ + addr = 0xf0 | ((msg->addr & 0x300) >> 7) | 0x01; + if (bcm_kona_i2c_write_byte(dev, addr, 0) < 0) + return -EREMOTEIO; + } + } else { + addr = msg->addr << 1; + + if (msg->flags & I2C_M_RD) + addr |= 1; + + if (bcm_kona_i2c_write_byte(dev, addr, 0) < 0) + return -EREMOTEIO; + } + + return 0; +} + +static void bcm_kona_i2c_enable_autosense(struct bcm_kona_i2c_dev *dev) +{ + writel(readl(dev->base + CLKEN_OFFSET) & ~CLKEN_AUTOSENSE_OFF_MASK, + dev->base + CLKEN_OFFSET); +} + +static void bcm_kona_i2c_config_timing(struct bcm_kona_i2c_dev *dev) +{ + writel(readl(dev->base + HSTIM_OFFSET) & ~HSTIM_HS_MODE_MASK, + dev->base + HSTIM_OFFSET); + + writel((dev->std_cfg->prescale << TIM_PRESCALE_SHIFT) | + (dev->std_cfg->time_p << TIM_P_SHIFT) | + (dev->std_cfg->no_div << TIM_NO_DIV_SHIFT) | + (dev->std_cfg->time_div << TIM_DIV_SHIFT), + dev->base + TIM_OFFSET); + + writel((dev->std_cfg->time_m << CLKEN_M_SHIFT) | + (dev->std_cfg->time_n << CLKEN_N_SHIFT) | + CLKEN_CLKEN_MASK, dev->base + CLKEN_OFFSET); +} + +/* Master transfer function */ +static int bcm_kona_i2c_xfer(struct bcm_kona_i2c_dev *dev, + struct i2c_msg msgs[], int num) +{ + struct i2c_msg *pmsg; + int rc = 0; + int i; + + /* Enable pad output */ + writel(0, dev->base + PADCTL_OFFSET); + + /* Enable internal clocks */ + bcm_kona_i2c_enable_clock(dev); + + /* Send start command */ + rc = bcm_kona_send_i2c_cmd(dev, BCM_CMD_START); + if (rc < 0) { + printf("Start command failed rc = %d\n", rc); + goto xfer_disable_pad; + } + + /* Loop through all messages */ + for (i = 0; i < num; i++) { + pmsg = &msgs[i]; + + /* Send restart for subsequent messages */ + if ((i != 0) && ((pmsg->flags & I2C_M_NOSTART) == 0)) { + rc = bcm_kona_send_i2c_cmd(dev, BCM_CMD_RESTART); + if (rc < 0) { + printf("restart cmd failed rc = %d\n", rc); + goto xfer_send_stop; + } + } + + /* Send slave address */ + if (!(pmsg->flags & I2C_M_NOSTART)) { + rc = bcm_kona_i2c_do_addr(dev, pmsg); + if (rc < 0) { + debug("NAK from addr %2.2x msg#%d rc = %d\n", + pmsg->addr, i, rc); + goto xfer_send_stop; + } + } + + /* Perform data transfer */ + if (pmsg->flags & I2C_M_RD) { + rc = bcm_kona_i2c_read_fifo(dev, pmsg); + if (rc < 0) { + printf("read failure\n"); + goto xfer_send_stop; + } + } else { + rc = bcm_kona_i2c_write_fifo(dev, pmsg); + if (rc < 0) { + printf("write failure"); + goto xfer_send_stop; + } + } + } + + rc = num; + +xfer_send_stop: + /* Send a STOP command */ + bcm_kona_send_i2c_cmd(dev, BCM_CMD_STOP); + +xfer_disable_pad: + /* Disable pad output */ + writel(PADCTL_PAD_OUT_EN_MASK, dev->base + PADCTL_OFFSET); + + /* Stop internal clock */ + bcm_kona_i2c_disable_clock(dev); + + return rc; +} + +static uint bcm_kona_i2c_assign_bus_speed(struct bcm_kona_i2c_dev *dev, + uint speed) +{ + switch (speed) { + case 100000: + dev->std_cfg = &std_cfg_table[BCM_SPD_100K]; + break; + case 400000: + dev->std_cfg = &std_cfg_table[BCM_SPD_400K]; + break; + case 1000000: + dev->std_cfg = &std_cfg_table[BCM_SPD_1MHZ]; + break; + default: + printf("%d hz bus speed not supported\n", speed); + return -EINVAL; + } + dev->speed = speed; + return 0; +} + +static void bcm_kona_i2c_init(struct bcm_kona_i2c_dev *dev) +{ + /* Parse bus speed */ + bcm_kona_i2c_assign_bus_speed(dev, dev->speed); + + /* Enable internal clocks */ + bcm_kona_i2c_enable_clock(dev); + + /* Configure internal dividers */ + bcm_kona_i2c_config_timing(dev); + + /* Disable timeout */ + writel(0, dev->base + TOUT_OFFSET); + + /* Enable autosense */ + bcm_kona_i2c_enable_autosense(dev); + + /* Enable TX FIFO */ + writel(TXFCR_FIFO_FLUSH_MASK | TXFCR_FIFO_EN_MASK, + dev->base + TXFCR_OFFSET); + + /* Mask all interrupts */ + writel(0, dev->base + IER_OFFSET); + + /* Clear all pending interrupts */ + writel(ISR_CMDBUSY_MASK | + ISR_READ_COMPLETE_MASK | + ISR_SES_DONE_MASK | + ISR_ERR_MASK | + ISR_TXFIFOEMPTY_MASK | ISR_NOACK_MASK, dev->base + ISR_OFFSET); + + /* Enable the controller but leave it idle */ + bcm_kona_i2c_send_cmd_to_ctrl(dev, BCM_CMD_NOACTION); + + /* Disable pad output */ + writel(PADCTL_PAD_OUT_EN_MASK, dev->base + PADCTL_OFFSET); +} + +/**************** uboot layer ********************/ +struct bcm_kona_i2c_dev *kona_get_dev(struct i2c_adapter *adap) +{ + return &g_i2c_devs[adap->hwadapnr]; +} + +static void kona_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr) +{ + struct bcm_kona_i2c_dev *dev = kona_get_dev(adap); + + if (clk_bsc_enable(dev->base)) + return; + + bcm_kona_i2c_init(dev); +} + +static int kona_i2c_read(struct i2c_adapter *adap, uchar chip, uint addr, + int alen, uchar *buffer, int len) +{ + /* msg[0] writes the addr, msg[1] reads the data */ + struct i2c_msg msg[2]; + unsigned char msgbuf0[64]; + struct bcm_kona_i2c_dev *dev = kona_get_dev(adap); + + msg[0].addr = chip; + msg[0].flags = 0; + msg[0].len = 1; + msg[0].buf = msgbuf0; /* msgbuf0 contains incrementing reg addr */ + + msg[1].addr = chip; + msg[1].flags = I2C_M_RD; + /* msg[1].buf dest ptr increments each read */ + + msgbuf0[0] = (unsigned char)addr; + msg[1].buf = buffer; + msg[1].len = len; + if (bcm_kona_i2c_xfer(dev, msg, 2) < 0) { + /* Sending 2 i2c messages */ + kona_i2c_init(adap, adap->speed, adap->slaveaddr); + debug("I2C read: I/O error\n"); + return -EIO; + } + return 0; +} + +static int kona_i2c_write(struct i2c_adapter *adap, uchar chip, uint addr, + int alen, uchar *buffer, int len) +{ + struct i2c_msg msg[0]; + unsigned char msgbuf0[64]; + unsigned int i; + struct bcm_kona_i2c_dev *dev = kona_get_dev(adap); + + msg[0].addr = chip; + msg[0].flags = 0; + msg[0].len = 2; /* addr byte plus data */ + msg[0].buf = msgbuf0; + + for (i = 0; i < len; i++) { + msgbuf0[0] = addr++; + msgbuf0[1] = buffer[i]; + if (bcm_kona_i2c_xfer(dev, msg, 1) < 0) { + kona_i2c_init(adap, adap->speed, adap->slaveaddr); + debug("I2C write: I/O error\n"); + return -EIO; + } + } + return 0; +} + +static int kona_i2c_probe(struct i2c_adapter *adap, uchar chip) +{ + uchar tmp; + + /* + * read addr 0x0 of the given chip. + */ + return kona_i2c_read(adap, chip, 0x0, 1, &tmp, 1); +} + +static uint kona_i2c_set_bus_speed(struct i2c_adapter *adap, uint speed) +{ + struct bcm_kona_i2c_dev *dev = kona_get_dev(adap); + return bcm_kona_i2c_assign_bus_speed(dev, speed); +} + +/* + * Register kona i2c adapters. Keep the order below so + * that the bus number matches the adapter number. + */ +#define DEF_ADAPTER(num) \ +U_BOOT_I2C_ADAP_COMPLETE(kona##num, kona_i2c_init, kona_i2c_probe, \ + kona_i2c_read, kona_i2c_write, \ + kona_i2c_set_bus_speed, DEF_SPD, 0x00, num) + +#ifdef CONFIG_SYS_I2C_BASE0 + DEF_ADAPTER(0) +#endif +#ifdef CONFIG_SYS_I2C_BASE1 + DEF_ADAPTER(1) +#endif +#ifdef CONFIG_SYS_I2C_BASE2 + DEF_ADAPTER(2) +#endif +#ifdef CONFIG_SYS_I2C_BASE3 + DEF_ADAPTER(3) +#endif +#ifdef CONFIG_SYS_I2C_BASE4 + DEF_ADAPTER(4) +#endif +#ifdef CONFIG_SYS_I2C_BASE5 + DEF_ADAPTER(5) +#endif