@@ -77,6 +77,21 @@ config I2C_AMD8111
This driver can also be built as a module. If so, the module
will be called i2c-amd8111.
+config I2C_HIX5HD2
+ tristate "Hix5hd2 high-speed I2C driver"
+ help
+ Say Y here to include support for high-speed I2C controller in the
+ Hisilicon based hix5hd2 SoCs. Specifically, the following versions
+ of the chipset are supported:
+ Hi3716CV200 (support six I2C module)
+ Hi3719CV100 (support six I2C module)
+ Hi3718CV100 (support six I2C module)
+ Hi3719MV100 (support two I2C module)
+ Hi3718MV100 (support two I2C module)
+
+ This driver can also be built as a module. If so, the module
+ will be called i2c-hix5hd2.
+
config I2C_I801
tristate "Intel 82801 (ICH/PCH)"
depends on PCI
@@ -47,6 +47,7 @@ obj-$(CONFIG_I2C_EG20T) += i2c-eg20t.o
obj-$(CONFIG_I2C_EXYNOS5) += i2c-exynos5.o
obj-$(CONFIG_I2C_GPIO) += i2c-gpio.o
obj-$(CONFIG_I2C_HIGHLANDER) += i2c-highlander.o
+obj-$(CONFIG_I2C_HIX5HD2) += i2c-hix5hd2.o
obj-$(CONFIG_I2C_IBM_IIC) += i2c-ibm_iic.o
obj-$(CONFIG_I2C_IMX) += i2c-imx.o
obj-$(CONFIG_I2C_IOP3XX) += i2c-iop3xx.o
new file mode 100644
@@ -0,0 +1,573 @@
+/*
+ * Copyright (c) 2014 Linaro Ltd.
+ * Copyright (c) 2014 Hisilicon Limited.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * publishhed by the Free Software Foundation.
+ *
+ * Now only support 7 bit address.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+/* Register Map */
+#define HIX5I2C_CTRL 0x00
+#define HIX5I2C_COM 0x04
+#define HIX5I2C_ICR 0x08
+#define HIX5I2C_SR 0x0c
+#define HIX5I2C_SCL_H 0x10
+#define HIX5I2C_SCL_L 0x14
+#define HIX5I2C_TXR 0x18
+#define HIX5I2C_RXR 0x1c
+
+/* I2C_CTRL_REG */
+#define I2C_ENABLE BIT(8)
+#define I2C_UNMASK_TOTAL BIT(7)
+#define I2C_UNMASK_START BIT(6)
+#define I2C_UNMASK_END BIT(5)
+#define I2C_UNMASK_SEND BIT(4)
+#define I2C_UNMASK_RECEIVE BIT(3)
+#define I2C_UNMASK_ACK BIT(2)
+#define I2C_UNMASK_ARBITRATE BIT(1)
+#define I2C_UNMASK_OVER BIT(0)
+#define I2C_UNMASK_ALL (I2C_UNMASK_ACK | I2C_UNMASK_OVER)
+
+/* I2C_COM_REG */
+#define I2C_NO_ACK BIT(4)
+#define I2C_START BIT(3)
+#define I2C_READ BIT(2)
+#define I2C_WRITE BIT(1)
+#define I2C_STOP BIT(0)
+
+/* I2C_ICR_REG */
+#define I2C_CLEAR_START BIT(6)
+#define I2C_CLEAR_END BIT(5)
+#define I2C_CLEAR_SEND BIT(4)
+#define I2C_CLEAR_RECEIVE BIT(3)
+#define I2C_CLEAR_ACK BIT(2)
+#define I2C_CLEAR_ARBITRATE BIT(1)
+#define I2C_CLEAR_OVER BIT(0)
+#define I2C_CLEAR_ALL (I2C_CLEAR_START | I2C_CLEAR_END | \
+ I2C_CLEAR_SEND | I2C_CLEAR_RECEIVE | \
+ I2C_CLEAR_ACK | I2C_CLEAR_ARBITRATE | \
+ I2C_CLEAR_OVER)
+
+/* I2C_SR_REG */
+#define I2C_BUSY BIT(7)
+#define I2C_START_INTR BIT(6)
+#define I2C_END_INTR BIT(5)
+#define I2C_SEND_INTR BIT(4)
+#define I2C_RECEIVE_INTR BIT(3)
+#define I2C_ACK_INTR BIT(2)
+#define I2C_ARBITRATE_INTR BIT(1)
+#define I2C_OVER_INTR BIT(0)
+
+/*
+ * Controller operating frequency, timing values for operation
+ * are calculated against this frequency
+ */
+#define HIX5I2C_NS_TX_CLOCK 100000 /* 100k */
+#define HIX5I2C_HS_TX_CLOCK 400000 /* 400k */
+
+#define HIX5I2C_READ_OPERATION 0x01
+#define HIX5I2C_WRITE_OPERATION 0xfe
+
+enum hix5hd2_i2c_state {
+ HIX5I2C_STAT_RW_ERR = -1,
+ HIX5I2C_STAT_INIT,
+ HIX5I2C_STAT_RW,
+ HIX5I2C_STAT_SND_STOP,
+ HIX5I2C_STAT_RW_SUCCESS,
+};
+
+enum hix5hd2_i2c_speed {
+ HIX5I2C_NORMAL_SPD, /* Fast speed upto 1Mbps */
+ HIX5I2C_HIG_SPD, /* High speed upto 3.4Mbps */
+};
+
+struct hix5hd2_i2c {
+ struct i2c_adapter adap;
+ struct i2c_msg *msg;
+ unsigned int msg_ptr; /* msg index */
+ unsigned int len; /* msg length */
+ int stop;
+ struct completion msg_complete;
+
+ unsigned int irq;
+ void __iomem *regs;
+ struct clk *clk;
+ struct device *dev;
+ spinlock_t lock; /* IRQ synchronization */
+
+ int err;
+ enum hix5hd2_i2c_state state;
+ enum hix5hd2_i2c_speed speed_mode;
+
+ /* Controller frequency */
+ unsigned int s_clock;
+};
+
+static u32 hix5hd2_i2c_clr_pend_irq(struct hix5hd2_i2c *i2c)
+{
+ u32 val = readl_relaxed(i2c->regs + HIX5I2C_SR);
+
+ writel_relaxed(val, i2c->regs + HIX5I2C_ICR);
+
+ return val;
+}
+
+static void hix5hd2_i2c_clr_all_irq(struct hix5hd2_i2c *i2c)
+{
+ writel_relaxed(I2C_CLEAR_ALL, i2c->regs + HIX5I2C_ICR);
+}
+
+static void hix5hd2_i2c_disable_irq(struct hix5hd2_i2c *i2c)
+{
+ writel_relaxed(0, i2c->regs + HIX5I2C_CTRL);
+}
+
+static void hix5hd2_i2c_enable_irq(struct hix5hd2_i2c *i2c)
+{
+ writel_relaxed(I2C_ENABLE | I2C_UNMASK_TOTAL | I2C_UNMASK_ALL,
+ i2c->regs + HIX5I2C_CTRL);
+}
+
+static void hix5hd2_i2c_drv_setrate(struct hix5hd2_i2c *i2c)
+{
+ u32 rate, val;
+ u32 sclh, scll, sysclock;
+
+ /* close all i2c interrupt */
+ val = readl_relaxed(i2c->regs + HIX5I2C_CTRL);
+ writel_relaxed(val & (~I2C_UNMASK_TOTAL), i2c->regs + HIX5I2C_CTRL);
+
+ rate = i2c->s_clock;
+ sysclock = clk_get_rate(i2c->clk);
+ sclh = (sysclock / (rate * 2)) / 2 - 1;
+ writel_relaxed(sclh, i2c->regs + HIX5I2C_SCL_H);
+ scll = (sysclock / (rate * 2)) / 2 - 1;
+ writel_relaxed(scll, i2c->regs + HIX5I2C_SCL_L);
+
+ /* restore original interrupt*/
+ writel_relaxed(val, i2c->regs + HIX5I2C_CTRL);
+
+ dev_dbg(i2c->dev, "%s: sysclock=%d, rate=%d, sclh=%d, scll=%d\n",
+ __func__, sysclock, rate, sclh, scll);
+}
+
+static void hix5hd2_i2c_init(struct hix5hd2_i2c *i2c)
+{
+ hix5hd2_i2c_disable_irq(i2c);
+ hix5hd2_i2c_drv_setrate(i2c);
+ hix5hd2_i2c_clr_all_irq(i2c);
+ hix5hd2_i2c_enable_irq(i2c);
+}
+
+static void hix5hd2_i2c_reset(struct hix5hd2_i2c *i2c)
+{
+ clk_disable_unprepare(i2c->clk);
+ msleep(20);
+ clk_prepare_enable(i2c->clk);
+ hix5hd2_i2c_init(i2c);
+}
+
+static int hix5hd2_i2c_wait_bus_idle(struct hix5hd2_i2c *i2c)
+{
+ unsigned long stop_time;
+ u32 int_status;
+
+ /* wait for 100 milli seconds for the bus to be idle */
+ stop_time = jiffies + msecs_to_jiffies(100);
+ do {
+ int_status = hix5hd2_i2c_clr_pend_irq(i2c);
+ if (!(int_status & I2C_BUSY))
+ return 0;
+
+ usleep_range(50, 200);
+ } while (time_before(jiffies, stop_time));
+
+ return -EBUSY;
+}
+
+static void hix5hd2_rw_over(struct hix5hd2_i2c *i2c)
+{
+ if (HIX5I2C_STAT_SND_STOP == i2c->state)
+ dev_dbg(i2c->dev, "%s: rw and send stop over\n", __func__);
+ else
+ dev_dbg(i2c->dev, "%s: have not data to send\n", __func__);
+
+ i2c->state = HIX5I2C_STAT_RW_SUCCESS;
+ i2c->err = 0;
+}
+
+static void hix5hd2_rw_handle_stop(struct hix5hd2_i2c *i2c)
+{
+ if (i2c->stop) {
+ i2c->state = HIX5I2C_STAT_SND_STOP;
+ writel_relaxed(I2C_STOP, i2c->regs + HIX5I2C_COM);
+ } else {
+ hix5hd2_rw_over(i2c);
+ }
+}
+
+static void hix5hd2_read_handle(struct hix5hd2_i2c *i2c)
+{
+ if (1 == i2c->len) {
+ /* the last byte don't need send ACK */
+ writel_relaxed(I2C_READ | I2C_NO_ACK, i2c->regs + HIX5I2C_COM);
+ } else if (i2c->len > 1) {
+ /* if i2c master receive data will send ACK */
+ writel_relaxed(I2C_READ, i2c->regs + HIX5I2C_COM);
+ } else {
+ hix5hd2_rw_handle_stop(i2c);
+ }
+}
+
+static void hix5hd2_write_handle(struct hix5hd2_i2c *i2c)
+{
+ u8 data;
+
+ if (i2c->len > 0) {
+ data = i2c->msg->buf[i2c->msg_ptr++];
+ writel_relaxed(data, i2c->regs + HIX5I2C_TXR);
+ writel_relaxed(I2C_WRITE, i2c->regs + HIX5I2C_COM);
+ } else {
+ hix5hd2_rw_handle_stop(i2c);
+ }
+}
+
+static int hix5hd2_rw_preprocess(struct hix5hd2_i2c *i2c)
+{
+ u8 data;
+
+ if (HIX5I2C_STAT_INIT == i2c->state) {
+ i2c->state = HIX5I2C_STAT_RW;
+ } else if (HIX5I2C_STAT_RW == i2c->state) {
+ if (i2c->msg->flags & I2C_M_RD) {
+ data = readl_relaxed(i2c->regs + HIX5I2C_RXR);
+ i2c->msg->buf[i2c->msg_ptr++] = data;
+ }
+ i2c->len--;
+ } else {
+ dev_dbg(i2c->dev, "%s: error: i2c->state = %d, len = %d\n",
+ __func__, i2c->state, i2c->len);
+ return -EAGAIN;
+ }
+ return 0;
+}
+
+static irqreturn_t hix5hd2_i2c_irq(int irqno, void *dev_id)
+{
+ struct hix5hd2_i2c *i2c = dev_id;
+ u32 int_status;
+ int ret;
+
+ spin_lock(&i2c->lock);
+
+ int_status = hix5hd2_i2c_clr_pend_irq(i2c);
+
+ /* handle error */
+ if (int_status & I2C_ARBITRATE_INTR) {
+ /*Bus error */
+ dev_dbg(i2c->dev, "ARB bus loss\n");
+ i2c->err = -ENXIO;
+ i2c->state = HIX5I2C_STAT_RW_ERR;
+ goto stop;
+ } else if (int_status & I2C_ACK_INTR) {
+ /* ack error */
+ dev_dbg(i2c->dev, "No ACK from device\n");
+ i2c->err = -ENXIO;
+ i2c->state = HIX5I2C_STAT_RW_ERR;
+ goto stop;
+ }
+
+ if (int_status & I2C_OVER_INTR) {
+ if (i2c->len > 0) {
+ ret = hix5hd2_rw_preprocess(i2c);
+ if (ret) {
+ i2c->err = ret;
+ i2c->state = HIX5I2C_STAT_RW_ERR;
+ goto stop;
+ }
+ if (i2c->msg->flags & I2C_M_RD)
+ hix5hd2_read_handle(i2c);
+ else
+ hix5hd2_write_handle(i2c);
+ } else {
+ hix5hd2_rw_over(i2c);
+ }
+ }
+
+stop:
+ if ((HIX5I2C_STAT_RW_SUCCESS == i2c->state &&
+ i2c->msg->len == i2c->msg_ptr) ||
+ (HIX5I2C_STAT_RW_ERR == i2c->state)) {
+ hix5hd2_i2c_disable_irq(i2c);
+ hix5hd2_i2c_clr_pend_irq(i2c);
+ complete(&i2c->msg_complete);
+ }
+
+ spin_unlock(&i2c->lock);
+
+ return IRQ_HANDLED;
+}
+
+static void hix5hd2_i2c_message_start(struct hix5hd2_i2c *i2c, int stop)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&i2c->lock, flags);
+ hix5hd2_i2c_clr_all_irq(i2c);
+ hix5hd2_i2c_enable_irq(i2c);
+
+ if (i2c->msg->flags & I2C_M_RD)
+ writel_relaxed(i2c->msg->addr | HIX5I2C_READ_OPERATION,
+ i2c->regs + HIX5I2C_TXR);
+ else
+ writel_relaxed(i2c->msg->addr & HIX5I2C_WRITE_OPERATION,
+ i2c->regs + HIX5I2C_TXR);
+
+ writel_relaxed(I2C_WRITE | I2C_START, i2c->regs + HIX5I2C_COM);
+ spin_unlock_irqrestore(&i2c->lock, flags);
+}
+
+static int hix5hd2_i2c_xfer_msg(struct hix5hd2_i2c *i2c,
+ struct i2c_msg *msgs, int stop)
+{
+ unsigned long timeout;
+ int ret;
+
+ i2c->msg = msgs;
+ i2c->msg_ptr = 0;
+ i2c->len = i2c->msg->len;
+ i2c->stop = stop;
+ i2c->err = 0;
+ i2c->state = HIX5I2C_STAT_INIT;
+
+ reinit_completion(&i2c->msg_complete);
+ hix5hd2_i2c_message_start(i2c, stop);
+
+ timeout = wait_for_completion_timeout(&i2c->msg_complete,
+ i2c->adap.timeout);
+ if (timeout == 0) {
+ i2c->state = HIX5I2C_STAT_RW_ERR;
+ i2c->err = -ETIMEDOUT;
+ dev_warn(i2c->dev, "%s timeout=%d\n",
+ msgs->flags & I2C_M_RD ? "rx" : "tx",
+ i2c->adap.timeout);
+ }
+ ret = i2c->state;
+
+ /*
+ * If this is the last message to be transfered (stop == 1)
+ * Then check if the bus can be brought back to idle.
+ */
+ if (i2c->state == HIX5I2C_STAT_RW_SUCCESS && stop)
+ ret = hix5hd2_i2c_wait_bus_idle(i2c);
+
+ if (ret < 0)
+ hix5hd2_i2c_reset(i2c);
+
+ return i2c->err;
+}
+
+static int hix5hd2_i2c_xfer(struct i2c_adapter *adap,
+ struct i2c_msg *msgs, int num)
+{
+ struct hix5hd2_i2c *i2c = i2c_get_adapdata(adap);
+ int i, ret, stop;
+
+ pm_runtime_get_sync(i2c->dev);
+
+ for (i = 0; i < num; i++, msgs++) {
+ stop = (i == num - 1);
+ ret = hix5hd2_i2c_xfer_msg(i2c, msgs, stop);
+ if (ret < 0)
+ goto out;
+ }
+
+ if (i == num) {
+ ret = num;
+ } else {
+ /* Only one message, cannot access the device */
+ if (i == 1)
+ ret = -EREMOTEIO;
+ else
+ ret = i;
+
+ dev_warn(i2c->dev, "xfer message failed\n");
+ }
+
+out:
+ pm_runtime_mark_last_busy(i2c->dev);
+ pm_runtime_put_autosuspend(i2c->dev);
+ return ret;
+}
+
+static u32 hix5hd2_i2c_func(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
+}
+
+static const struct i2c_algorithm hix5hd2_i2c_algorithm = {
+ .master_xfer = hix5hd2_i2c_xfer,
+ .functionality = hix5hd2_i2c_func,
+};
+
+static int hix5hd2_i2c_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct hix5hd2_i2c *i2c;
+ struct resource *mem;
+ unsigned int op_clock;
+ int ret;
+
+ i2c = devm_kzalloc(&pdev->dev, sizeof(struct hix5hd2_i2c), GFP_KERNEL);
+ if (!i2c)
+ return -ENOMEM;
+
+ if (of_property_read_u32(np, "clock-frequency", &op_clock)) {
+ /* use default value */
+ i2c->speed_mode = HIX5I2C_HIG_SPD;
+ i2c->s_clock = HIX5I2C_HS_TX_CLOCK;
+ } else {
+ if (op_clock >= HIX5I2C_HS_TX_CLOCK) {
+ i2c->speed_mode = HIX5I2C_HIG_SPD;
+ i2c->s_clock = HIX5I2C_HS_TX_CLOCK;
+ } else {
+ i2c->speed_mode = HIX5I2C_NORMAL_SPD;
+ i2c->s_clock = op_clock;
+ }
+ }
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ i2c->regs = devm_ioremap_resource(&pdev->dev, mem);
+ if (IS_ERR(i2c->regs))
+ return PTR_ERR(i2c->regs);
+
+ i2c->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(i2c->clk)) {
+ dev_err(&pdev->dev, "cannot get clock\n");
+ return -ENOENT;
+ }
+ clk_prepare_enable(i2c->clk);
+
+ i2c->irq = platform_get_irq(pdev, 0);
+ if (i2c->irq <= 0) {
+ dev_err(&pdev->dev, "cannot find HS-I2C IRQ\n");
+ ret = -EINVAL;
+ goto err_clk;
+ }
+
+ strlcpy(i2c->adap.name, "hix5hd2-i2c", sizeof(i2c->adap.name));
+ i2c->dev = &pdev->dev;
+ i2c->adap.owner = THIS_MODULE;
+ i2c->adap.algo = &hix5hd2_i2c_algorithm;
+ i2c->adap.retries = 3;
+ i2c->adap.dev.of_node = np;
+ i2c->adap.algo_data = i2c;
+ i2c->adap.dev.parent = &pdev->dev;
+ i2c_set_adapdata(&i2c->adap, i2c);
+ platform_set_drvdata(pdev, i2c);
+ spin_lock_init(&i2c->lock);
+ init_completion(&i2c->msg_complete);
+
+ hix5hd2_i2c_init(i2c);
+
+ ret = devm_request_irq(&pdev->dev, i2c->irq, hix5hd2_i2c_irq,
+ IRQF_NO_SUSPEND | IRQF_ONESHOT,
+ dev_name(&pdev->dev), i2c);
+ if (ret != 0) {
+ dev_err(&pdev->dev, "cannot request HS-I2C IRQ %d\n", i2c->irq);
+ goto err_clk;
+ }
+
+ ret = i2c_add_adapter(&i2c->adap);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "failed to add bus to i2c core\n");
+ goto err_clk;
+ }
+
+ pm_suspend_ignore_children(&pdev->dev, true);
+ pm_runtime_set_autosuspend_delay(i2c->dev, MSEC_PER_SEC);
+ pm_runtime_use_autosuspend(i2c->dev);
+ pm_runtime_set_active(i2c->dev);
+ pm_runtime_enable(i2c->dev);
+
+ return ret;
+
+err_clk:
+ clk_disable_unprepare(i2c->clk);
+ return ret;
+}
+
+static int hix5hd2_i2c_remove(struct platform_device *pdev)
+{
+ struct hix5hd2_i2c *i2c = platform_get_drvdata(pdev);
+
+ i2c_del_adapter(&i2c->adap);
+ pm_runtime_disable(i2c->dev);
+ pm_runtime_set_suspended(i2c->dev);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int hix5hd2_i2c_runtime_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct hix5hd2_i2c *i2c = platform_get_drvdata(pdev);
+
+ clk_disable_unprepare(i2c->clk);
+
+ return 0;
+}
+
+static int hix5hd2_i2c_runtime_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct hix5hd2_i2c *i2c = platform_get_drvdata(pdev);
+
+ clk_prepare_enable(i2c->clk);
+ hix5hd2_i2c_init(i2c);
+
+ return 0;
+}
+#endif
+
+static const struct dev_pm_ops hix5hd2_i2c_pm_ops = {
+ SET_PM_RUNTIME_PM_OPS(hix5hd2_i2c_runtime_suspend,
+ hix5hd2_i2c_runtime_resume,
+ NULL)
+};
+
+static const struct of_device_id hix5hd2_i2c_match[] = {
+ { .compatible = "hisilicon,hix5hd2-i2c" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, hix5hd2_i2c_match);
+
+static struct platform_driver hix5hd2_i2c_driver = {
+ .probe = hix5hd2_i2c_probe,
+ .remove = hix5hd2_i2c_remove,
+ .driver = {
+ .name = "hix5hd2-i2c",
+ .pm = &hix5hd2_i2c_pm_ops,
+ .of_match_table = hix5hd2_i2c_match,
+ },
+};
+
+module_platform_driver(hix5hd2_i2c_driver);
+
+MODULE_DESCRIPTION("Hix5hd2 I2C Bus driver");
+MODULE_AUTHOR("Wei Yan <sledge.yanwei@huawei.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:i2c-hix5hd2");