summaryrefslogtreecommitdiffstats
path: root/drivers
diff options
context:
space:
mode:
Diffstat (limited to 'drivers')
-rw-r--r--drivers/i2c/busses/Kconfig10
-rw-r--r--drivers/i2c/busses/Makefile1
-rw-r--r--drivers/i2c/busses/i2c-qcom-cci.c791
3 files changed, 802 insertions, 0 deletions
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 2ddca08f8a76..70a561bff74a 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -885,6 +885,16 @@ config I2C_PXA_SLAVE
is necessary for systems where the PXA may be a target on the
I2C bus.
+config I2C_QCOM_CCI
+ tristate "Qualcomm Camera Control Interface"
+ depends on ARCH_QCOM || COMPILE_TEST
+ help
+ If you say yes to this option, support will be included for the
+ built-in camera control interface on the Qualcomm SoCs.
+
+ This driver can also be built as a module. If so, the module
+ will be called i2c-qcom-cci.
+
config I2C_QCOM_GENI
tristate "Qualcomm Technologies Inc.'s GENI based I2C controller"
depends on ARCH_QCOM || COMPILE_TEST
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 25d60889713c..c852d2737037 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -91,6 +91,7 @@ obj-$(CONFIG_I2C_PNX) += i2c-pnx.o
obj-$(CONFIG_I2C_PUV3) += i2c-puv3.o
obj-$(CONFIG_I2C_PXA) += i2c-pxa.o
obj-$(CONFIG_I2C_PXA_PCI) += i2c-pxa-pci.o
+obj-$(CONFIG_I2C_QCOM_CCI) += i2c-qcom-cci.o
obj-$(CONFIG_I2C_QCOM_GENI) += i2c-qcom-geni.o
obj-$(CONFIG_I2C_QUP) += i2c-qup.o
obj-$(CONFIG_I2C_RIIC) += i2c-riic.o
diff --git a/drivers/i2c/busses/i2c-qcom-cci.c b/drivers/i2c/busses/i2c-qcom-cci.c
new file mode 100644
index 000000000000..f13735beca58
--- /dev/null
+++ b/drivers/i2c/busses/i2c-qcom-cci.c
@@ -0,0 +1,791 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2012-2016, The Linux Foundation. All rights reserved.
+// Copyright (c) 2017-20 Linaro Limited.
+
+#include <linux/clk.h>
+#include <linux/completion.h>
+#include <linux/i2c.h>
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+#define CCI_HW_VERSION 0x0
+#define CCI_RESET_CMD 0x004
+#define CCI_RESET_CMD_MASK 0x0f73f3f7
+#define CCI_RESET_CMD_M0_MASK 0x000003f1
+#define CCI_RESET_CMD_M1_MASK 0x0003f001
+#define CCI_QUEUE_START 0x008
+#define CCI_HALT_REQ 0x034
+#define CCI_HALT_REQ_I2C_M0_Q0Q1 BIT(0)
+#define CCI_HALT_REQ_I2C_M1_Q0Q1 BIT(1)
+
+#define CCI_I2C_Mm_SCL_CTL(m) (0x100 + 0x100 * (m))
+#define CCI_I2C_Mm_SDA_CTL_0(m) (0x104 + 0x100 * (m))
+#define CCI_I2C_Mm_SDA_CTL_1(m) (0x108 + 0x100 * (m))
+#define CCI_I2C_Mm_SDA_CTL_2(m) (0x10c + 0x100 * (m))
+#define CCI_I2C_Mm_MISC_CTL(m) (0x110 + 0x100 * (m))
+
+#define CCI_I2C_Mm_READ_DATA(m) (0x118 + 0x100 * (m))
+#define CCI_I2C_Mm_READ_BUF_LEVEL(m) (0x11c + 0x100 * (m))
+#define CCI_I2C_Mm_Qn_EXEC_WORD_CNT(m, n) (0x300 + 0x200 * (m) + 0x100 * (n))
+#define CCI_I2C_Mm_Qn_CUR_WORD_CNT(m, n) (0x304 + 0x200 * (m) + 0x100 * (n))
+#define CCI_I2C_Mm_Qn_CUR_CMD(m, n) (0x308 + 0x200 * (m) + 0x100 * (n))
+#define CCI_I2C_Mm_Qn_REPORT_STATUS(m, n) (0x30c + 0x200 * (m) + 0x100 * (n))
+#define CCI_I2C_Mm_Qn_LOAD_DATA(m, n) (0x310 + 0x200 * (m) + 0x100 * (n))
+
+#define CCI_IRQ_GLOBAL_CLEAR_CMD 0xc00
+#define CCI_IRQ_MASK_0 0xc04
+#define CCI_IRQ_MASK_0_I2C_M0_RD_DONE BIT(0)
+#define CCI_IRQ_MASK_0_I2C_M0_Q0_REPORT BIT(4)
+#define CCI_IRQ_MASK_0_I2C_M0_Q1_REPORT BIT(8)
+#define CCI_IRQ_MASK_0_I2C_M1_RD_DONE BIT(12)
+#define CCI_IRQ_MASK_0_I2C_M1_Q0_REPORT BIT(16)
+#define CCI_IRQ_MASK_0_I2C_M1_Q1_REPORT BIT(20)
+#define CCI_IRQ_MASK_0_RST_DONE_ACK BIT(24)
+#define CCI_IRQ_MASK_0_I2C_M0_Q0Q1_HALT_ACK BIT(25)
+#define CCI_IRQ_MASK_0_I2C_M1_Q0Q1_HALT_ACK BIT(26)
+#define CCI_IRQ_MASK_0_I2C_M0_ERROR 0x18000ee6
+#define CCI_IRQ_MASK_0_I2C_M1_ERROR 0x60ee6000
+#define CCI_IRQ_CLEAR_0 0xc08
+#define CCI_IRQ_STATUS_0 0xc0c
+#define CCI_IRQ_STATUS_0_I2C_M0_RD_DONE BIT(0)
+#define CCI_IRQ_STATUS_0_I2C_M0_Q0_REPORT BIT(4)
+#define CCI_IRQ_STATUS_0_I2C_M0_Q1_REPORT BIT(8)
+#define CCI_IRQ_STATUS_0_I2C_M1_RD_DONE BIT(12)
+#define CCI_IRQ_STATUS_0_I2C_M1_Q0_REPORT BIT(16)
+#define CCI_IRQ_STATUS_0_I2C_M1_Q1_REPORT BIT(20)
+#define CCI_IRQ_STATUS_0_RST_DONE_ACK BIT(24)
+#define CCI_IRQ_STATUS_0_I2C_M0_Q0Q1_HALT_ACK BIT(25)
+#define CCI_IRQ_STATUS_0_I2C_M1_Q0Q1_HALT_ACK BIT(26)
+#define CCI_IRQ_STATUS_0_I2C_M0_Q0_NACK_ERR BIT(27)
+#define CCI_IRQ_STATUS_0_I2C_M0_Q1_NACK_ERR BIT(28)
+#define CCI_IRQ_STATUS_0_I2C_M1_Q0_NACK_ERR BIT(29)
+#define CCI_IRQ_STATUS_0_I2C_M1_Q1_NACK_ERR BIT(30)
+#define CCI_IRQ_STATUS_0_I2C_M0_ERROR 0x18000ee6
+#define CCI_IRQ_STATUS_0_I2C_M1_ERROR 0x60ee6000
+
+#define CCI_TIMEOUT (msecs_to_jiffies(100))
+#define NUM_MASTERS 2
+#define NUM_QUEUES 2
+
+/* Max number of resources + 1 for a NULL terminator */
+#define CCI_RES_MAX 6
+
+#define CCI_I2C_SET_PARAM 1
+#define CCI_I2C_REPORT 8
+#define CCI_I2C_WRITE 9
+#define CCI_I2C_READ 10
+
+#define CCI_I2C_REPORT_IRQ_EN BIT(8)
+
+enum {
+ I2C_MODE_STANDARD,
+ I2C_MODE_FAST,
+ I2C_MODE_FAST_PLUS,
+};
+
+enum cci_i2c_queue_t {
+ QUEUE_0,
+ QUEUE_1
+};
+
+struct hw_params {
+ u16 thigh; /* HIGH period of the SCL clock in clock ticks */
+ u16 tlow; /* LOW period of the SCL clock */
+ u16 tsu_sto; /* set-up time for STOP condition */
+ u16 tsu_sta; /* set-up time for a repeated START condition */
+ u16 thd_dat; /* data hold time */
+ u16 thd_sta; /* hold time (repeated) START condition */
+ u16 tbuf; /* bus free time between a STOP and START condition */
+ u8 scl_stretch_en;
+ u16 trdhld;
+ u16 tsp; /* pulse width of spikes suppressed by the input filter */
+};
+
+struct cci;
+
+struct cci_master {
+ struct i2c_adapter adap;
+ u16 master;
+ u8 mode;
+ int status;
+ struct completion irq_complete;
+ struct cci *cci;
+};
+
+struct cci_data {
+ unsigned int num_masters;
+ struct i2c_adapter_quirks quirks;
+ u16 queue_size[NUM_QUEUES];
+ unsigned long cci_clk_rate;
+ struct hw_params params[3];
+};
+
+struct cci {
+ struct device *dev;
+ void __iomem *base;
+ unsigned int irq;
+ const struct cci_data *data;
+ struct clk_bulk_data *clocks;
+ int nclocks;
+ struct cci_master master[NUM_MASTERS];
+};
+
+static irqreturn_t cci_isr(int irq, void *dev)
+{
+ struct cci *cci = dev;
+ u32 val, reset = 0;
+ int ret = IRQ_NONE;
+
+ val = readl(cci->base + CCI_IRQ_STATUS_0);
+ writel(val, cci->base + CCI_IRQ_CLEAR_0);
+ writel(0x1, cci->base + CCI_IRQ_GLOBAL_CLEAR_CMD);
+
+ if (val & CCI_IRQ_STATUS_0_RST_DONE_ACK) {
+ complete(&cci->master[0].irq_complete);
+ if (cci->master[1].master)
+ complete(&cci->master[1].irq_complete);
+ ret = IRQ_HANDLED;
+ }
+
+ if (val & CCI_IRQ_STATUS_0_I2C_M0_RD_DONE ||
+ val & CCI_IRQ_STATUS_0_I2C_M0_Q0_REPORT ||
+ val & CCI_IRQ_STATUS_0_I2C_M0_Q1_REPORT) {
+ cci->master[0].status = 0;
+ complete(&cci->master[0].irq_complete);
+ ret = IRQ_HANDLED;
+ }
+
+ if (val & CCI_IRQ_STATUS_0_I2C_M1_RD_DONE ||
+ val & CCI_IRQ_STATUS_0_I2C_M1_Q0_REPORT ||
+ val & CCI_IRQ_STATUS_0_I2C_M1_Q1_REPORT) {
+ cci->master[1].status = 0;
+ complete(&cci->master[1].irq_complete);
+ ret = IRQ_HANDLED;
+ }
+
+ if (unlikely(val & CCI_IRQ_STATUS_0_I2C_M0_Q0Q1_HALT_ACK)) {
+ reset = CCI_RESET_CMD_M0_MASK;
+ ret = IRQ_HANDLED;
+ }
+
+ if (unlikely(val & CCI_IRQ_STATUS_0_I2C_M1_Q0Q1_HALT_ACK)) {
+ reset = CCI_RESET_CMD_M1_MASK;
+ ret = IRQ_HANDLED;
+ }
+
+ if (unlikely(reset))
+ writel(reset, cci->base + CCI_RESET_CMD);
+
+ if (unlikely(val & CCI_IRQ_STATUS_0_I2C_M0_ERROR)) {
+ if (val & CCI_IRQ_STATUS_0_I2C_M0_Q0_NACK_ERR ||
+ val & CCI_IRQ_STATUS_0_I2C_M0_Q1_NACK_ERR)
+ cci->master[0].status = -ENXIO;
+ else
+ cci->master[0].status = -EIO;
+
+ writel(CCI_HALT_REQ_I2C_M0_Q0Q1, cci->base + CCI_HALT_REQ);
+ ret = IRQ_HANDLED;
+ }
+
+ if (unlikely(val & CCI_IRQ_STATUS_0_I2C_M1_ERROR)) {
+ if (val & CCI_IRQ_STATUS_0_I2C_M1_Q0_NACK_ERR ||
+ val & CCI_IRQ_STATUS_0_I2C_M1_Q1_NACK_ERR)
+ cci->master[0].status = -ENXIO;
+ else
+ cci->master[0].status = -EIO;
+
+ writel(CCI_HALT_REQ_I2C_M1_Q0Q1, cci->base + CCI_HALT_REQ);
+ ret = IRQ_HANDLED;
+ }
+
+ return ret;
+}
+
+static int cci_halt(struct cci *cci, u8 master_num)
+{
+ struct cci_master *master;
+ u32 val;
+
+ if (master_num >= cci->data->num_masters) {
+ dev_err(cci->dev, "Unsupported master idx (%u)\n", master_num);
+ return -EINVAL;
+ }
+
+ val = BIT(master_num);
+ master = &cci->master[master_num];
+
+ reinit_completion(&master->irq_complete);
+ writel(val, cci->base + CCI_HALT_REQ);
+
+ if (!wait_for_completion_timeout(&master->irq_complete, CCI_TIMEOUT)) {
+ dev_err(cci->dev, "CCI halt timeout\n");
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
+static int cci_reset(struct cci *cci)
+{
+ /*
+ * we reset the whole controller, here and for implicity use
+ * master[0].xxx for waiting on it.
+ */
+ reinit_completion(&cci->master[0].irq_complete);
+ writel(CCI_RESET_CMD_MASK, cci->base + CCI_RESET_CMD);
+
+ if (!wait_for_completion_timeout(&cci->master[0].irq_complete,
+ CCI_TIMEOUT)) {
+ dev_err(cci->dev, "CCI reset timeout\n");
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
+static int cci_init(struct cci *cci)
+{
+ u32 val = CCI_IRQ_MASK_0_I2C_M0_RD_DONE |
+ CCI_IRQ_MASK_0_I2C_M0_Q0_REPORT |
+ CCI_IRQ_MASK_0_I2C_M0_Q1_REPORT |
+ CCI_IRQ_MASK_0_I2C_M1_RD_DONE |
+ CCI_IRQ_MASK_0_I2C_M1_Q0_REPORT |
+ CCI_IRQ_MASK_0_I2C_M1_Q1_REPORT |
+ CCI_IRQ_MASK_0_RST_DONE_ACK |
+ CCI_IRQ_MASK_0_I2C_M0_Q0Q1_HALT_ACK |
+ CCI_IRQ_MASK_0_I2C_M1_Q0Q1_HALT_ACK |
+ CCI_IRQ_MASK_0_I2C_M0_ERROR |
+ CCI_IRQ_MASK_0_I2C_M1_ERROR;
+ int i;
+
+ writel(val, cci->base + CCI_IRQ_MASK_0);
+
+ for (i = 0; i < cci->data->num_masters; i++) {
+ int mode = cci->master[i].mode;
+ const struct hw_params *hw;
+
+ if (!cci->master[i].cci)
+ continue;
+
+ hw = &cci->data->params[mode];
+
+ val = hw->thigh << 16 | hw->tlow;
+ writel(val, cci->base + CCI_I2C_Mm_SCL_CTL(i));
+
+ val = hw->tsu_sto << 16 | hw->tsu_sta;
+ writel(val, cci->base + CCI_I2C_Mm_SDA_CTL_0(i));
+
+ val = hw->thd_dat << 16 | hw->thd_sta;
+ writel(val, cci->base + CCI_I2C_Mm_SDA_CTL_1(i));
+
+ val = hw->tbuf;
+ writel(val, cci->base + CCI_I2C_Mm_SDA_CTL_2(i));
+
+ val = hw->scl_stretch_en << 8 | hw->trdhld << 4 | hw->tsp;
+ writel(val, cci->base + CCI_I2C_Mm_MISC_CTL(i));
+ }
+
+ return 0;
+}
+
+static int cci_run_queue(struct cci *cci, u8 master, u8 queue)
+{
+ u32 val;
+
+ val = readl(cci->base + CCI_I2C_Mm_Qn_CUR_WORD_CNT(master, queue));
+ writel(val, cci->base + CCI_I2C_Mm_Qn_EXEC_WORD_CNT(master, queue));
+
+ reinit_completion(&cci->master[master].irq_complete);
+ val = BIT(master * 2 + queue);
+ writel(val, cci->base + CCI_QUEUE_START);
+
+ if (!wait_for_completion_timeout(&cci->master[master].irq_complete,
+ CCI_TIMEOUT)) {
+ dev_err(cci->dev, "master %d queue %d timeout\n",
+ master, queue);
+ cci_reset(cci);
+ cci_init(cci);
+ return -ETIMEDOUT;
+ }
+
+ return cci->master[master].status;
+}
+
+static int cci_validate_queue(struct cci *cci, u8 master, u8 queue)
+{
+ u32 val;
+
+ val = readl(cci->base + CCI_I2C_Mm_Qn_CUR_WORD_CNT(master, queue));
+ if (val == cci->data->queue_size[queue])
+ return -EINVAL;
+
+ if (!val)
+ return 0;
+
+ val = CCI_I2C_REPORT | CCI_I2C_REPORT_IRQ_EN;
+ writel(val, cci->base + CCI_I2C_Mm_Qn_LOAD_DATA(master, queue));
+
+ return cci_run_queue(cci, master, queue);
+}
+
+static int cci_i2c_read(struct cci *cci, u16 master,
+ u16 addr, u8 *buf, u16 len)
+{
+ u32 val, words_read, words_exp;
+ u8 queue = QUEUE_1;
+ int i, index = 0, ret;
+ bool first = true;
+
+ /*
+ * Call validate queue to make sure queue is empty before starting.
+ * This is to avoid overflow / underflow of queue.
+ */
+ ret = cci_validate_queue(cci, master, queue);
+ if (ret < 0)
+ return ret;
+
+ val = CCI_I2C_SET_PARAM | (addr & 0x7f) << 4;
+ writel(val, cci->base + CCI_I2C_Mm_Qn_LOAD_DATA(master, queue));
+
+ val = CCI_I2C_READ | len << 4;
+ writel(val, cci->base + CCI_I2C_Mm_Qn_LOAD_DATA(master, queue));
+
+ ret = cci_run_queue(cci, master, queue);
+ if (ret < 0)
+ return ret;
+
+ words_read = readl(cci->base + CCI_I2C_Mm_READ_BUF_LEVEL(master));
+ words_exp = len / 4 + 1;
+ if (words_read != words_exp) {
+ dev_err(cci->dev, "words read = %d, words expected = %d\n",
+ words_read, words_exp);
+ return -EIO;
+ }
+
+ do {
+ val = readl(cci->base + CCI_I2C_Mm_READ_DATA(master));
+
+ for (i = 0; i < 4 && index < len; i++) {
+ if (first) {
+ /* The LS byte of this register represents the
+ * first byte read from the slave during a read
+ * access.
+ */
+ first = false;
+ continue;
+ }
+ buf[index++] = (val >> (i * 8)) & 0xff;
+ }
+ } while (--words_read);
+
+ return 0;
+}
+
+static int cci_i2c_write(struct cci *cci, u16 master,
+ u16 addr, u8 *buf, u16 len)
+{
+ u8 queue = QUEUE_0;
+ u8 load[12] = { 0 };
+ int i = 0, j, ret;
+ u32 val;
+
+ /*
+ * Call validate queue to make sure queue is empty before starting.
+ * This is to avoid overflow / underflow of queue.
+ */
+ ret = cci_validate_queue(cci, master, queue);
+ if (ret < 0)
+ return ret;
+
+ val = CCI_I2C_SET_PARAM | (addr & 0x7f) << 4;
+ writel(val, cci->base + CCI_I2C_Mm_Qn_LOAD_DATA(master, queue));
+
+ load[i++] = CCI_I2C_WRITE | len << 4;
+
+ for (j = 0; j < len; j++)
+ load[i++] = buf[j];
+
+ for (j = 0; j < i; j += 4) {
+ val = load[j];
+ val |= load[j + 1] << 8;
+ val |= load[j + 2] << 16;
+ val |= load[j + 3] << 24;
+ writel(val, cci->base + CCI_I2C_Mm_Qn_LOAD_DATA(master, queue));
+ }
+
+ val = CCI_I2C_REPORT | CCI_I2C_REPORT_IRQ_EN;
+ writel(val, cci->base + CCI_I2C_Mm_Qn_LOAD_DATA(master, queue));
+
+ return cci_run_queue(cci, master, queue);
+}
+
+static int cci_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
+{
+ struct cci_master *cci_master = i2c_get_adapdata(adap);
+ struct cci *cci = cci_master->cci;
+ int i, ret;
+
+ ret = pm_runtime_get_sync(cci->dev);
+ if (ret < 0)
+ goto err;
+
+ for (i = 0; i < num; i++) {
+ if (msgs[i].flags & I2C_M_RD)
+ ret = cci_i2c_read(cci, cci_master->master,
+ msgs[i].addr, msgs[i].buf,
+ msgs[i].len);
+ else
+ ret = cci_i2c_write(cci, cci_master->master,
+ msgs[i].addr, msgs[i].buf,
+ msgs[i].len);
+
+ if (ret < 0)
+ break;
+ }
+
+ if (!ret)
+ ret = num;
+
+err:
+ pm_runtime_mark_last_busy(cci->dev);
+ pm_runtime_put_autosuspend(cci->dev);
+
+ return ret;
+}
+
+static u32 cci_func(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm cci_algo = {
+ .master_xfer = cci_xfer,
+ .functionality = cci_func,
+};
+
+static int cci_enable_clocks(struct cci *cci)
+{
+ return clk_bulk_prepare_enable(cci->nclocks, cci->clocks);
+}
+
+static void cci_disable_clocks(struct cci *cci)
+{
+ clk_bulk_disable_unprepare(cci->nclocks, cci->clocks);
+}
+
+static int __maybe_unused cci_suspend_runtime(struct device *dev)
+{
+ struct cci *cci = dev_get_drvdata(dev);
+
+ cci_disable_clocks(cci);
+ return 0;
+}
+
+static int __maybe_unused cci_resume_runtime(struct device *dev)
+{
+ struct cci *cci = dev_get_drvdata(dev);
+ int ret;
+
+ ret = cci_enable_clocks(cci);
+ if (ret)
+ return ret;
+
+ cci_init(cci);
+ return 0;
+}
+
+static int __maybe_unused cci_suspend(struct device *dev)
+{
+ if (!pm_runtime_suspended(dev))
+ return cci_suspend_runtime(dev);
+
+ return 0;
+}
+
+static int __maybe_unused cci_resume(struct device *dev)
+{
+ cci_resume_runtime(dev);
+ pm_runtime_mark_last_busy(dev);
+ pm_request_autosuspend(dev);
+
+ return 0;
+}
+
+static const struct dev_pm_ops qcom_cci_pm = {
+ SET_SYSTEM_SLEEP_PM_OPS(cci_suspend, cci_resume)
+ SET_RUNTIME_PM_OPS(cci_suspend_runtime, cci_resume_runtime, NULL)
+};
+
+static int cci_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ unsigned long cci_clk_rate = 0;
+ struct device_node *child;
+ struct resource *r;
+ struct cci *cci;
+ int ret, i;
+ u32 val;
+
+ cci = devm_kzalloc(dev, sizeof(*cci), GFP_KERNEL);
+ if (!cci)
+ return -ENOMEM;
+
+ cci->dev = dev;
+ platform_set_drvdata(pdev, cci);
+ cci->data = device_get_match_data(dev);
+ if (!cci->data)
+ return -ENOENT;
+
+ for_each_available_child_of_node(dev->of_node, child) {
+ u32 idx;
+
+ ret = of_property_read_u32(child, "reg", &idx);
+ if (ret) {
+ dev_err(dev, "%pOF invalid 'reg' property", child);
+ continue;
+ }
+
+ if (idx >= cci->data->num_masters) {
+ dev_err(dev, "%pOF invalid 'reg' value: %u (max is %u)",
+ child, idx, cci->data->num_masters - 1);
+ continue;
+ }
+
+ cci->master[idx].adap.quirks = &cci->data->quirks;
+ cci->master[idx].adap.algo = &cci_algo;
+ cci->master[idx].adap.dev.parent = dev;
+ cci->master[idx].adap.dev.of_node = child;
+ cci->master[idx].master = idx;
+ cci->master[idx].cci = cci;
+
+ i2c_set_adapdata(&cci->master[idx].adap, &cci->master[idx]);
+ snprintf(cci->master[idx].adap.name,
+ sizeof(cci->master[idx].adap.name), "Qualcomm-CCI");
+
+ cci->master[idx].mode = I2C_MODE_STANDARD;
+ ret = of_property_read_u32(child, "clock-frequency", &val);
+ if (!ret) {
+ if (val == 400000)
+ cci->master[idx].mode = I2C_MODE_FAST;
+ else if (val == 1000000)
+ cci->master[idx].mode = I2C_MODE_FAST_PLUS;
+ }
+
+ init_completion(&cci->master[idx].irq_complete);
+ }
+
+ /* Memory */
+
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ cci->base = devm_ioremap_resource(dev, r);
+ if (IS_ERR(cci->base))
+ return PTR_ERR(cci->base);
+
+ /* Clocks */
+
+ ret = devm_clk_bulk_get_all(dev, &cci->clocks);
+ if (ret < 1) {
+ dev_err(dev, "failed to get clocks %d\n", ret);
+ return ret;
+ }
+ cci->nclocks = ret;
+
+ /* Retrieve CCI clock rate */
+ for (i = 0; i < cci->nclocks; i++) {
+ if (!strcmp(cci->clocks[i].id, "cci")) {
+ cci_clk_rate = clk_get_rate(cci->clocks[i].clk);
+ break;
+ }
+ }
+
+ if (cci_clk_rate != cci->data->cci_clk_rate) {
+ /* cci clock set by the bootloader or via assigned clock rate
+ * in DT.
+ */
+ dev_warn(dev, "Found %lu cci clk rate while %lu was expected\n",
+ cci_clk_rate, cci->data->cci_clk_rate);
+ }
+
+ ret = cci_enable_clocks(cci);
+ if (ret < 0)
+ return ret;
+
+ /* Interrupt */
+
+ ret = platform_get_irq(pdev, 0);
+ if (ret < 0)
+ goto disable_clocks;
+ cci->irq = ret;
+
+ ret = devm_request_irq(dev, cci->irq, cci_isr, 0, dev_name(dev), cci);
+ if (ret < 0) {
+ dev_err(dev, "request_irq failed, ret: %d\n", ret);
+ goto disable_clocks;
+ }
+
+ val = readl(cci->base + CCI_HW_VERSION);
+ dev_dbg(dev, "CCI HW version = 0x%08x", val);
+
+ ret = cci_reset(cci);
+ if (ret < 0)
+ goto error;
+
+ ret = cci_init(cci);
+ if (ret < 0)
+ goto error;
+
+ for (i = 0; i < cci->data->num_masters; i++) {
+ if (!cci->master[i].cci)
+ continue;
+
+ ret = i2c_add_adapter(&cci->master[i].adap);
+ if (ret < 0)
+ goto error_i2c;
+ }
+
+ pm_runtime_set_autosuspend_delay(dev, MSEC_PER_SEC);
+ pm_runtime_use_autosuspend(dev);
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+
+ return 0;
+
+error_i2c:
+ for (; i >= 0; i--) {
+ if (cci->master[i].cci)
+ i2c_del_adapter(&cci->master[i].adap);
+ }
+error:
+ disable_irq(cci->irq);
+disable_clocks:
+ cci_disable_clocks(cci);
+
+ return ret;
+}
+
+static int cci_remove(struct platform_device *pdev)
+{
+ struct cci *cci = platform_get_drvdata(pdev);
+ int i;
+
+ for (i = 0; i < cci->data->num_masters; i++) {
+ if (cci->master[i].cci)
+ i2c_del_adapter(&cci->master[i].adap);
+ cci_halt(cci, i);
+ }
+
+ disable_irq(cci->irq);
+ pm_runtime_disable(&pdev->dev);
+ pm_runtime_set_suspended(&pdev->dev);
+
+ return 0;
+}
+
+static const struct cci_data cci_v1_data = {
+ .num_masters = 1,
+ .queue_size = { 64, 16 },
+ .quirks = {
+ .max_write_len = 10,
+ .max_read_len = 12,
+ },
+ .cci_clk_rate = 19200000,
+ .params[I2C_MODE_STANDARD] = {
+ .thigh = 78,
+ .tlow = 114,
+ .tsu_sto = 28,
+ .tsu_sta = 28,
+ .thd_dat = 10,
+ .thd_sta = 77,
+ .tbuf = 118,
+ .scl_stretch_en = 0,
+ .trdhld = 6,
+ .tsp = 1
+ },
+ .params[I2C_MODE_FAST] = {
+ .thigh = 20,
+ .tlow = 28,
+ .tsu_sto = 21,
+ .tsu_sta = 21,
+ .thd_dat = 13,
+ .thd_sta = 18,
+ .tbuf = 32,
+ .scl_stretch_en = 0,
+ .trdhld = 6,
+ .tsp = 3
+ },
+};
+
+static const struct cci_data cci_v2_data = {
+ .num_masters = 2,
+ .queue_size = { 64, 16 },
+ .quirks = {
+ .max_write_len = 11,
+ .max_read_len = 12,
+ },
+ .cci_clk_rate = 37500000,
+ .params[I2C_MODE_STANDARD] = {
+ .thigh = 201,
+ .tlow = 174,
+ .tsu_sto = 204,
+ .tsu_sta = 231,
+ .thd_dat = 22,
+ .thd_sta = 162,
+ .tbuf = 227,
+ .scl_stretch_en = 0,
+ .trdhld = 6,
+ .tsp = 3
+ },
+ .params[I2C_MODE_FAST] = {
+ .thigh = 38,
+ .tlow = 56,
+ .tsu_sto = 40,
+ .tsu_sta = 40,
+ .thd_dat = 22,
+ .thd_sta = 35,
+ .tbuf = 62,
+ .scl_stretch_en = 0,
+ .trdhld = 6,
+ .tsp = 3
+ },
+ .params[I2C_MODE_FAST_PLUS] = {
+ .thigh = 16,
+ .tlow = 22,
+ .tsu_sto = 17,
+ .tsu_sta = 18,
+ .thd_dat = 16,
+ .thd_sta = 15,
+ .tbuf = 24,
+ .scl_stretch_en = 0,
+ .trdhld = 3,
+ .tsp = 3
+ },
+};
+
+static const struct of_device_id cci_dt_match[] = {
+ { .compatible = "qcom,msm8916-cci", .data = &cci_v1_data},
+ { .compatible = "qcom,msm8996-cci", .data = &cci_v2_data},
+ { .compatible = "qcom,sdm845-cci", .data = &cci_v2_data},
+ {}
+};
+MODULE_DEVICE_TABLE(of, cci_dt_match);
+
+static struct platform_driver qcom_cci_driver = {
+ .probe = cci_probe,
+ .remove = cci_remove,
+ .driver = {
+ .name = "i2c-qcom-cci",
+ .of_match_table = cci_dt_match,
+ .pm = &qcom_cci_pm,
+ },
+};
+
+module_platform_driver(qcom_cci_driver);
+
+MODULE_DESCRIPTION("Qualcomm Camera Control Interface driver");
+MODULE_AUTHOR("Todor Tomov <todor.tomov@linaro.org>");
+MODULE_AUTHOR("Loic Poulain <loic.poulain@linaro.org>");
+MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-20 18:01:45 +0100