[U-Boot] [PATCH v1 4/6] i2c: kona: Add Kona I2C driver

Darwin Rambo
2014-02-03T21:03:00Z

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..9f18b74
--- /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
--
1.7.9.5