summaryrefslogtreecommitdiffstats
path: root/drivers/i2c/busses/i2c-brcmstb.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/i2c/busses/i2c-brcmstb.c')
-rw-r--r--drivers/i2c/busses/i2c-brcmstb.c747
1 files changed, 747 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-brcmstb.c b/drivers/i2c/busses/i2c-brcmstb.c
new file mode 100644
index 000000000..69383be47
--- /dev/null
+++ b/drivers/i2c/busses/i2c-brcmstb.c
@@ -0,0 +1,747 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// Copyright (C) 2014 Broadcom Corporation
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+
+#define N_DATA_REGS 8
+
+/*
+ * PER_I2C/BSC count register mask depends on 1 byte/4 byte data register
+ * size. Cable modem and DSL SoCs with Peripheral i2c cores use 1 byte per
+ * data register whereas STB SoCs use 4 byte per data register transfer,
+ * account for this difference in total count per transaction and mask to
+ * use.
+ */
+#define BSC_CNT_REG1_MASK(nb) (nb == 1 ? GENMASK(3, 0) : GENMASK(5, 0))
+#define BSC_CNT_REG1_SHIFT 0
+
+/* BSC CTL register field definitions */
+#define BSC_CTL_REG_DTF_MASK 0x00000003
+#define BSC_CTL_REG_SCL_SEL_MASK 0x00000030
+#define BSC_CTL_REG_SCL_SEL_SHIFT 4
+#define BSC_CTL_REG_INT_EN_MASK 0x00000040
+#define BSC_CTL_REG_INT_EN_SHIFT 6
+#define BSC_CTL_REG_DIV_CLK_MASK 0x00000080
+
+/* BSC_IIC_ENABLE r/w enable and interrupt field definitions */
+#define BSC_IIC_EN_RESTART_MASK 0x00000040
+#define BSC_IIC_EN_NOSTART_MASK 0x00000020
+#define BSC_IIC_EN_NOSTOP_MASK 0x00000010
+#define BSC_IIC_EN_NOACK_MASK 0x00000004
+#define BSC_IIC_EN_INTRP_MASK 0x00000002
+#define BSC_IIC_EN_ENABLE_MASK 0x00000001
+
+/* BSC_CTLHI control register field definitions */
+#define BSC_CTLHI_REG_INPUT_SWITCHING_LEVEL_MASK 0x00000080
+#define BSC_CTLHI_REG_DATAREG_SIZE_MASK 0x00000040
+#define BSC_CTLHI_REG_IGNORE_ACK_MASK 0x00000002
+#define BSC_CTLHI_REG_WAIT_DIS_MASK 0x00000001
+
+#define I2C_TIMEOUT 100 /* msecs */
+
+/* Condition mask used for non combined transfer */
+#define COND_RESTART BSC_IIC_EN_RESTART_MASK
+#define COND_NOSTART BSC_IIC_EN_NOSTART_MASK
+#define COND_NOSTOP BSC_IIC_EN_NOSTOP_MASK
+#define COND_START_STOP (COND_RESTART | COND_NOSTART | COND_NOSTOP)
+
+/* BSC data transfer direction */
+#define DTF_WR_MASK 0x00000000
+#define DTF_RD_MASK 0x00000001
+/* BSC data transfer direction combined format */
+#define DTF_RD_WR_MASK 0x00000002
+#define DTF_WR_RD_MASK 0x00000003
+
+#define INT_ENABLE true
+#define INT_DISABLE false
+
+/* BSC block register map structure to cache fields to be written */
+struct bsc_regs {
+ u32 chip_address; /* slave address */
+ u32 data_in[N_DATA_REGS]; /* tx data buffer*/
+ u32 cnt_reg; /* rx/tx data length */
+ u32 ctl_reg; /* control register */
+ u32 iic_enable; /* xfer enable and status */
+ u32 data_out[N_DATA_REGS]; /* rx data buffer */
+ u32 ctlhi_reg; /* more control fields */
+ u32 scl_param; /* reserved */
+};
+
+struct bsc_clk_param {
+ u32 hz;
+ u32 scl_mask;
+ u32 div_mask;
+};
+
+enum bsc_xfer_cmd {
+ CMD_WR,
+ CMD_RD,
+ CMD_WR_NOACK,
+ CMD_RD_NOACK,
+};
+
+static char const *cmd_string[] = {
+ [CMD_WR] = "WR",
+ [CMD_RD] = "RD",
+ [CMD_WR_NOACK] = "WR NOACK",
+ [CMD_RD_NOACK] = "RD NOACK",
+};
+
+enum bus_speeds {
+ SPD_375K,
+ SPD_390K,
+ SPD_187K,
+ SPD_200K,
+ SPD_93K,
+ SPD_97K,
+ SPD_46K,
+ SPD_50K
+};
+
+static const struct bsc_clk_param bsc_clk[] = {
+ [SPD_375K] = {
+ .hz = 375000,
+ .scl_mask = SPD_375K << BSC_CTL_REG_SCL_SEL_SHIFT,
+ .div_mask = 0
+ },
+ [SPD_390K] = {
+ .hz = 390000,
+ .scl_mask = SPD_390K << BSC_CTL_REG_SCL_SEL_SHIFT,
+ .div_mask = 0
+ },
+ [SPD_187K] = {
+ .hz = 187500,
+ .scl_mask = SPD_187K << BSC_CTL_REG_SCL_SEL_SHIFT,
+ .div_mask = 0
+ },
+ [SPD_200K] = {
+ .hz = 200000,
+ .scl_mask = SPD_200K << BSC_CTL_REG_SCL_SEL_SHIFT,
+ .div_mask = 0
+ },
+ [SPD_93K] = {
+ .hz = 93750,
+ .scl_mask = SPD_375K << BSC_CTL_REG_SCL_SEL_SHIFT,
+ .div_mask = BSC_CTL_REG_DIV_CLK_MASK
+ },
+ [SPD_97K] = {
+ .hz = 97500,
+ .scl_mask = SPD_390K << BSC_CTL_REG_SCL_SEL_SHIFT,
+ .div_mask = BSC_CTL_REG_DIV_CLK_MASK
+ },
+ [SPD_46K] = {
+ .hz = 46875,
+ .scl_mask = SPD_187K << BSC_CTL_REG_SCL_SEL_SHIFT,
+ .div_mask = BSC_CTL_REG_DIV_CLK_MASK
+ },
+ [SPD_50K] = {
+ .hz = 50000,
+ .scl_mask = SPD_200K << BSC_CTL_REG_SCL_SEL_SHIFT,
+ .div_mask = BSC_CTL_REG_DIV_CLK_MASK
+ }
+};
+
+struct brcmstb_i2c_dev {
+ struct device *device;
+ void __iomem *base;
+ int irq;
+ struct bsc_regs *bsc_regmap;
+ struct i2c_adapter adapter;
+ struct completion done;
+ u32 clk_freq_hz;
+ int data_regsz;
+};
+
+/* register accessors for both be and le cpu arch */
+#ifdef CONFIG_CPU_BIG_ENDIAN
+#define __bsc_readl(_reg) ioread32be(_reg)
+#define __bsc_writel(_val, _reg) iowrite32be(_val, _reg)
+#else
+#define __bsc_readl(_reg) ioread32(_reg)
+#define __bsc_writel(_val, _reg) iowrite32(_val, _reg)
+#endif
+
+#define bsc_readl(_dev, _reg) \
+ __bsc_readl(_dev->base + offsetof(struct bsc_regs, _reg))
+
+#define bsc_writel(_dev, _val, _reg) \
+ __bsc_writel(_val, _dev->base + offsetof(struct bsc_regs, _reg))
+
+static inline int brcmstb_i2c_get_xfersz(struct brcmstb_i2c_dev *dev)
+{
+ return (N_DATA_REGS * dev->data_regsz);
+}
+
+static inline int brcmstb_i2c_get_data_regsz(struct brcmstb_i2c_dev *dev)
+{
+ return dev->data_regsz;
+}
+
+static void brcmstb_i2c_enable_disable_irq(struct brcmstb_i2c_dev *dev,
+ bool int_en)
+{
+
+ if (int_en)
+ /* Enable BSC CTL interrupt line */
+ dev->bsc_regmap->ctl_reg |= BSC_CTL_REG_INT_EN_MASK;
+ else
+ /* Disable BSC CTL interrupt line */
+ dev->bsc_regmap->ctl_reg &= ~BSC_CTL_REG_INT_EN_MASK;
+
+ barrier();
+ bsc_writel(dev, dev->bsc_regmap->ctl_reg, ctl_reg);
+}
+
+static irqreturn_t brcmstb_i2c_isr(int irq, void *devid)
+{
+ struct brcmstb_i2c_dev *dev = devid;
+ u32 status_bsc_ctl = bsc_readl(dev, ctl_reg);
+ u32 status_iic_intrp = bsc_readl(dev, iic_enable);
+
+ dev_dbg(dev->device, "isr CTL_REG %x IIC_EN %x\n",
+ status_bsc_ctl, status_iic_intrp);
+
+ if (!(status_bsc_ctl & BSC_CTL_REG_INT_EN_MASK))
+ return IRQ_NONE;
+
+ brcmstb_i2c_enable_disable_irq(dev, INT_DISABLE);
+ complete(&dev->done);
+
+ dev_dbg(dev->device, "isr handled");
+ return IRQ_HANDLED;
+}
+
+/* Wait for device to be ready */
+static int brcmstb_i2c_wait_if_busy(struct brcmstb_i2c_dev *dev)
+{
+ unsigned long timeout = jiffies + msecs_to_jiffies(I2C_TIMEOUT);
+
+ while ((bsc_readl(dev, iic_enable) & BSC_IIC_EN_INTRP_MASK)) {
+ if (time_after(jiffies, timeout))
+ return -ETIMEDOUT;
+ cpu_relax();
+ }
+ return 0;
+}
+
+/* i2c xfer completion function, handles both irq and polling mode */
+static int brcmstb_i2c_wait_for_completion(struct brcmstb_i2c_dev *dev)
+{
+ int ret = 0;
+ unsigned long timeout = msecs_to_jiffies(I2C_TIMEOUT);
+
+ if (dev->irq >= 0) {
+ if (!wait_for_completion_timeout(&dev->done, timeout))
+ ret = -ETIMEDOUT;
+ } else {
+ /* we are in polling mode */
+ u32 bsc_intrp;
+ unsigned long time_left = jiffies + timeout;
+
+ do {
+ bsc_intrp = bsc_readl(dev, iic_enable) &
+ BSC_IIC_EN_INTRP_MASK;
+ if (time_after(jiffies, time_left)) {
+ ret = -ETIMEDOUT;
+ break;
+ }
+ cpu_relax();
+ } while (!bsc_intrp);
+ }
+
+ if (dev->irq < 0 || ret == -ETIMEDOUT)
+ brcmstb_i2c_enable_disable_irq(dev, INT_DISABLE);
+
+ return ret;
+}
+
+/* Set xfer START/STOP conditions for subsequent transfer */
+static void brcmstb_set_i2c_start_stop(struct brcmstb_i2c_dev *dev,
+ u32 cond_flag)
+{
+ u32 regval = dev->bsc_regmap->iic_enable;
+
+ dev->bsc_regmap->iic_enable = (regval & ~COND_START_STOP) | cond_flag;
+}
+
+/* Send I2C request check completion */
+static int brcmstb_send_i2c_cmd(struct brcmstb_i2c_dev *dev,
+ enum bsc_xfer_cmd cmd)
+{
+ int rc = 0;
+ struct bsc_regs *pi2creg = dev->bsc_regmap;
+
+ /* Make sure the hardware is ready */
+ rc = brcmstb_i2c_wait_if_busy(dev);
+ if (rc < 0)
+ return rc;
+
+ /* only if we are in interrupt mode */
+ if (dev->irq >= 0)
+ reinit_completion(&dev->done);
+
+ /* enable BSC CTL interrupt line */
+ brcmstb_i2c_enable_disable_irq(dev, INT_ENABLE);
+
+ /* initiate transfer by setting iic_enable */
+ pi2creg->iic_enable |= BSC_IIC_EN_ENABLE_MASK;
+ bsc_writel(dev, pi2creg->iic_enable, iic_enable);
+
+ /* Wait for transaction to finish or timeout */
+ rc = brcmstb_i2c_wait_for_completion(dev);
+ if (rc) {
+ dev_dbg(dev->device, "intr timeout for cmd %s\n",
+ cmd_string[cmd]);
+ goto cmd_out;
+ }
+
+ if ((cmd == CMD_RD || cmd == CMD_WR) &&
+ bsc_readl(dev, iic_enable) & BSC_IIC_EN_NOACK_MASK) {
+ rc = -EREMOTEIO;
+ dev_dbg(dev->device, "controller received NOACK intr for %s\n",
+ cmd_string[cmd]);
+ }
+
+cmd_out:
+ bsc_writel(dev, 0, cnt_reg);
+ bsc_writel(dev, 0, iic_enable);
+
+ return rc;
+}
+
+/* Actual data transfer through the BSC master */
+static int brcmstb_i2c_xfer_bsc_data(struct brcmstb_i2c_dev *dev,
+ u8 *buf, unsigned int len,
+ struct i2c_msg *pmsg)
+{
+ int cnt, byte, i, rc;
+ enum bsc_xfer_cmd cmd;
+ u32 ctl_reg;
+ struct bsc_regs *pi2creg = dev->bsc_regmap;
+ int no_ack = pmsg->flags & I2C_M_IGNORE_NAK;
+ int data_regsz = brcmstb_i2c_get_data_regsz(dev);
+
+ /* see if the transaction needs to check NACK conditions */
+ if (no_ack) {
+ cmd = (pmsg->flags & I2C_M_RD) ? CMD_RD_NOACK
+ : CMD_WR_NOACK;
+ pi2creg->ctlhi_reg |= BSC_CTLHI_REG_IGNORE_ACK_MASK;
+ } else {
+ cmd = (pmsg->flags & I2C_M_RD) ? CMD_RD : CMD_WR;
+ pi2creg->ctlhi_reg &= ~BSC_CTLHI_REG_IGNORE_ACK_MASK;
+ }
+ bsc_writel(dev, pi2creg->ctlhi_reg, ctlhi_reg);
+
+ /* set data transfer direction */
+ ctl_reg = pi2creg->ctl_reg & ~BSC_CTL_REG_DTF_MASK;
+ if (cmd == CMD_WR || cmd == CMD_WR_NOACK)
+ pi2creg->ctl_reg = ctl_reg | DTF_WR_MASK;
+ else
+ pi2creg->ctl_reg = ctl_reg | DTF_RD_MASK;
+
+ /* set the read/write length */
+ bsc_writel(dev, BSC_CNT_REG1_MASK(data_regsz) &
+ (len << BSC_CNT_REG1_SHIFT), cnt_reg);
+
+ /* Write data into data_in register */
+
+ if (cmd == CMD_WR || cmd == CMD_WR_NOACK) {
+ for (cnt = 0, i = 0; cnt < len; cnt += data_regsz, i++) {
+ u32 word = 0;
+
+ for (byte = 0; byte < data_regsz; byte++) {
+ word >>= BITS_PER_BYTE;
+ if ((cnt + byte) < len)
+ word |= buf[cnt + byte] <<
+ (BITS_PER_BYTE * (data_regsz - 1));
+ }
+ bsc_writel(dev, word, data_in[i]);
+ }
+ }
+
+ /* Initiate xfer, the function will return on completion */
+ rc = brcmstb_send_i2c_cmd(dev, cmd);
+
+ if (rc != 0) {
+ dev_dbg(dev->device, "%s failure", cmd_string[cmd]);
+ return rc;
+ }
+
+ /* Read data from data_out register */
+ if (cmd == CMD_RD || cmd == CMD_RD_NOACK) {
+ for (cnt = 0, i = 0; cnt < len; cnt += data_regsz, i++) {
+ u32 data = bsc_readl(dev, data_out[i]);
+
+ for (byte = 0; byte < data_regsz &&
+ (byte + cnt) < len; byte++) {
+ buf[cnt + byte] = data & 0xff;
+ data >>= BITS_PER_BYTE;
+ }
+ }
+ }
+
+ return 0;
+}
+
+/* Write a single byte of data to the i2c bus */
+static int brcmstb_i2c_write_data_byte(struct brcmstb_i2c_dev *dev,
+ u8 *buf, unsigned int nak_expected)
+{
+ enum bsc_xfer_cmd cmd = nak_expected ? CMD_WR : CMD_WR_NOACK;
+
+ bsc_writel(dev, 1, cnt_reg);
+ bsc_writel(dev, *buf, data_in);
+
+ return brcmstb_send_i2c_cmd(dev, cmd);
+}
+
+/* Send i2c address */
+static int brcmstb_i2c_do_addr(struct brcmstb_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);
+ bsc_writel(dev, addr, chip_address);
+
+ /* Second byte is the remaining 8 bits */
+ addr = msg->addr & 0xFF;
+ if (brcmstb_i2c_write_data_byte(dev, &addr, 0) < 0)
+ return -EREMOTEIO;
+
+ if (msg->flags & I2C_M_RD) {
+ /* For read, send restart without stop condition */
+ brcmstb_set_i2c_start_stop(dev, COND_RESTART
+ | COND_NOSTOP);
+ /* Then re-send the first byte with the read bit set */
+ addr = 0xF0 | ((msg->addr & 0x300) >> 7) | 0x01;
+ if (brcmstb_i2c_write_data_byte(dev, &addr, 0) < 0)
+ return -EREMOTEIO;
+
+ }
+ } else {
+ addr = i2c_8bit_addr_from_msg(msg);
+
+ bsc_writel(dev, addr, chip_address);
+ }
+
+ return 0;
+}
+
+/* Master transfer function */
+static int brcmstb_i2c_xfer(struct i2c_adapter *adapter,
+ struct i2c_msg msgs[], int num)
+{
+ struct brcmstb_i2c_dev *dev = i2c_get_adapdata(adapter);
+ struct i2c_msg *pmsg;
+ int rc = 0;
+ int i;
+ int bytes_to_xfer;
+ u8 *tmp_buf;
+ int len = 0;
+ int xfersz = brcmstb_i2c_get_xfersz(dev);
+ u32 cond, cond_per_msg;
+
+ /* Loop through all messages */
+ for (i = 0; i < num; i++) {
+ pmsg = &msgs[i];
+ len = pmsg->len;
+ tmp_buf = pmsg->buf;
+
+ dev_dbg(dev->device,
+ "msg# %d/%d flg %x buf %x len %d\n", i,
+ num - 1, pmsg->flags,
+ pmsg->buf ? pmsg->buf[0] : '0', pmsg->len);
+
+ if (i < (num - 1) && (msgs[i + 1].flags & I2C_M_NOSTART))
+ cond = ~COND_START_STOP;
+ else
+ cond = COND_RESTART | COND_NOSTOP;
+
+ brcmstb_set_i2c_start_stop(dev, cond);
+
+ /* Send slave address */
+ if (!(pmsg->flags & I2C_M_NOSTART)) {
+ rc = brcmstb_i2c_do_addr(dev, pmsg);
+ if (rc < 0) {
+ dev_dbg(dev->device,
+ "NACK for addr %2.2x msg#%d rc = %d\n",
+ pmsg->addr, i, rc);
+ goto out;
+ }
+ }
+
+ cond_per_msg = cond;
+
+ /* Perform data transfer */
+ while (len) {
+ bytes_to_xfer = min(len, xfersz);
+
+ if (len <= xfersz) {
+ if (i == (num - 1))
+ cond_per_msg = cond_per_msg &
+ ~(COND_RESTART | COND_NOSTOP);
+ else
+ cond_per_msg = cond;
+ } else {
+ cond_per_msg = (cond_per_msg & ~COND_RESTART) |
+ COND_NOSTOP;
+ }
+
+ brcmstb_set_i2c_start_stop(dev, cond_per_msg);
+
+ rc = brcmstb_i2c_xfer_bsc_data(dev, tmp_buf,
+ bytes_to_xfer, pmsg);
+ if (rc < 0)
+ goto out;
+
+ len -= bytes_to_xfer;
+ tmp_buf += bytes_to_xfer;
+
+ cond_per_msg = COND_NOSTART | COND_NOSTOP;
+ }
+ }
+
+ rc = num;
+out:
+ return rc;
+
+}
+
+static u32 brcmstb_i2c_functionality(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR
+ | I2C_FUNC_NOSTART | I2C_FUNC_PROTOCOL_MANGLING;
+}
+
+static const struct i2c_algorithm brcmstb_i2c_algo = {
+ .master_xfer = brcmstb_i2c_xfer,
+ .functionality = brcmstb_i2c_functionality,
+};
+
+static void brcmstb_i2c_set_bus_speed(struct brcmstb_i2c_dev *dev)
+{
+ int i = 0, num_speeds = ARRAY_SIZE(bsc_clk);
+ u32 clk_freq_hz = dev->clk_freq_hz;
+
+ for (i = 0; i < num_speeds; i++) {
+ if (bsc_clk[i].hz == clk_freq_hz) {
+ dev->bsc_regmap->ctl_reg &= ~(BSC_CTL_REG_SCL_SEL_MASK
+ | BSC_CTL_REG_DIV_CLK_MASK);
+ dev->bsc_regmap->ctl_reg |= (bsc_clk[i].scl_mask |
+ bsc_clk[i].div_mask);
+ bsc_writel(dev, dev->bsc_regmap->ctl_reg, ctl_reg);
+ break;
+ }
+ }
+
+ /* in case we did not get find a valid speed */
+ if (i == num_speeds) {
+ i = (bsc_readl(dev, ctl_reg) & BSC_CTL_REG_SCL_SEL_MASK) >>
+ BSC_CTL_REG_SCL_SEL_SHIFT;
+ dev_warn(dev->device, "leaving current clock-frequency @ %dHz\n",
+ bsc_clk[i].hz);
+ }
+}
+
+static void brcmstb_i2c_set_bsc_reg_defaults(struct brcmstb_i2c_dev *dev)
+{
+ if (brcmstb_i2c_get_data_regsz(dev) == sizeof(u32))
+ /* set 4 byte data in/out xfers */
+ dev->bsc_regmap->ctlhi_reg = BSC_CTLHI_REG_DATAREG_SIZE_MASK;
+ else
+ dev->bsc_regmap->ctlhi_reg &= ~BSC_CTLHI_REG_DATAREG_SIZE_MASK;
+
+ bsc_writel(dev, dev->bsc_regmap->ctlhi_reg, ctlhi_reg);
+ /* set bus speed */
+ brcmstb_i2c_set_bus_speed(dev);
+}
+
+#define AUTOI2C_CTRL0 0x26c
+#define AUTOI2C_CTRL0_RELEASE_BSC BIT(1)
+
+static int bcm2711_release_bsc(struct brcmstb_i2c_dev *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev->device);
+ struct resource *iomem;
+ void __iomem *autoi2c;
+
+ /* Map hardware registers */
+ iomem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "auto-i2c");
+ autoi2c = devm_ioremap_resource(&pdev->dev, iomem);
+ if (IS_ERR(autoi2c))
+ return PTR_ERR(autoi2c);
+
+ writel(AUTOI2C_CTRL0_RELEASE_BSC, autoi2c + AUTOI2C_CTRL0);
+ devm_iounmap(&pdev->dev, autoi2c);
+
+ /* We need to reset the controller after the release */
+ dev->bsc_regmap->iic_enable = 0;
+ bsc_writel(dev, dev->bsc_regmap->iic_enable, iic_enable);
+
+ return 0;
+}
+
+static int brcmstb_i2c_probe(struct platform_device *pdev)
+{
+ int rc = 0;
+ struct brcmstb_i2c_dev *dev;
+ struct i2c_adapter *adap;
+ struct resource *iomem;
+ const char *int_name;
+
+ /* Allocate memory for private data structure */
+ dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
+
+ dev->bsc_regmap = devm_kzalloc(&pdev->dev, sizeof(*dev->bsc_regmap), GFP_KERNEL);
+ if (!dev->bsc_regmap)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, dev);
+ dev->device = &pdev->dev;
+ init_completion(&dev->done);
+
+ /* Map hardware registers */
+ iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ dev->base = devm_ioremap_resource(dev->device, iomem);
+ if (IS_ERR(dev->base)) {
+ rc = -ENOMEM;
+ goto probe_errorout;
+ }
+
+ if (of_device_is_compatible(dev->device->of_node,
+ "brcm,bcm2711-hdmi-i2c")) {
+ rc = bcm2711_release_bsc(dev);
+ if (rc)
+ goto probe_errorout;
+ }
+
+ rc = of_property_read_string(dev->device->of_node, "interrupt-names",
+ &int_name);
+ if (rc < 0)
+ int_name = NULL;
+
+ /* Get the interrupt number */
+ dev->irq = platform_get_irq_optional(pdev, 0);
+
+ /* disable the bsc interrupt line */
+ brcmstb_i2c_enable_disable_irq(dev, INT_DISABLE);
+
+ /* register the ISR handler */
+ if (dev->irq >= 0) {
+ rc = devm_request_irq(&pdev->dev, dev->irq, brcmstb_i2c_isr,
+ IRQF_SHARED,
+ int_name ? int_name : pdev->name,
+ dev);
+
+ if (rc) {
+ dev_dbg(dev->device, "falling back to polling mode");
+ dev->irq = -1;
+ }
+ }
+
+ if (of_property_read_u32(dev->device->of_node,
+ "clock-frequency", &dev->clk_freq_hz)) {
+ dev_warn(dev->device, "setting clock-frequency@%dHz\n",
+ bsc_clk[0].hz);
+ dev->clk_freq_hz = bsc_clk[0].hz;
+ }
+
+ /* set the data in/out register size for compatible SoCs */
+ if (of_device_is_compatible(dev->device->of_node,
+ "brcm,brcmper-i2c"))
+ dev->data_regsz = sizeof(u8);
+ else
+ dev->data_regsz = sizeof(u32);
+
+ brcmstb_i2c_set_bsc_reg_defaults(dev);
+
+ /* Add the i2c adapter */
+ adap = &dev->adapter;
+ i2c_set_adapdata(adap, dev);
+ adap->owner = THIS_MODULE;
+ strscpy(adap->name, dev_name(&pdev->dev), sizeof(adap->name));
+ adap->algo = &brcmstb_i2c_algo;
+ adap->dev.parent = &pdev->dev;
+ adap->dev.of_node = pdev->dev.of_node;
+ rc = i2c_add_adapter(adap);
+ if (rc)
+ goto probe_errorout;
+
+ dev_info(dev->device, "%s@%dhz registered in %s mode\n",
+ int_name ? int_name : " ", dev->clk_freq_hz,
+ (dev->irq >= 0) ? "interrupt" : "polling");
+
+ return 0;
+
+probe_errorout:
+ return rc;
+}
+
+static int brcmstb_i2c_remove(struct platform_device *pdev)
+{
+ struct brcmstb_i2c_dev *dev = platform_get_drvdata(pdev);
+
+ i2c_del_adapter(&dev->adapter);
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int brcmstb_i2c_suspend(struct device *dev)
+{
+ struct brcmstb_i2c_dev *i2c_dev = dev_get_drvdata(dev);
+
+ i2c_mark_adapter_suspended(&i2c_dev->adapter);
+ return 0;
+}
+
+static int brcmstb_i2c_resume(struct device *dev)
+{
+ struct brcmstb_i2c_dev *i2c_dev = dev_get_drvdata(dev);
+
+ brcmstb_i2c_set_bsc_reg_defaults(i2c_dev);
+ i2c_mark_adapter_resumed(&i2c_dev->adapter);
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(brcmstb_i2c_pm, brcmstb_i2c_suspend,
+ brcmstb_i2c_resume);
+
+static const struct of_device_id brcmstb_i2c_of_match[] = {
+ {.compatible = "brcm,brcmstb-i2c"},
+ {.compatible = "brcm,brcmper-i2c"},
+ {.compatible = "brcm,bcm2711-hdmi-i2c"},
+ {},
+};
+MODULE_DEVICE_TABLE(of, brcmstb_i2c_of_match);
+
+static struct platform_driver brcmstb_i2c_driver = {
+ .driver = {
+ .name = "brcmstb-i2c",
+ .of_match_table = brcmstb_i2c_of_match,
+ .pm = &brcmstb_i2c_pm,
+ },
+ .probe = brcmstb_i2c_probe,
+ .remove = brcmstb_i2c_remove,
+};
+module_platform_driver(brcmstb_i2c_driver);
+
+MODULE_AUTHOR("Kamal Dasu <kdasu@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom Settop I2C Driver");
+MODULE_LICENSE("GPL v2");