This commit adds basic I2C bus support for the Camera Control Interface
(CCI) controller found on the Qualcomm SoC processors.
CCI versions supported:
- 1.0.8 - found on MSM8916/APQ8016 - support for the only CCI I2C bus;
- 1.4.0 - found on MSM8996/APQ8096 - support for first (out of two)
I2C bus.
Signed-off-by: Todor Tomov <todor.tomov@xxxxxxxxxx>
---
drivers/i2c/busses/Kconfig | 10 +
drivers/i2c/busses/Makefile | 1 +
drivers/i2c/busses/i2c-qcom-cci.c | 793 ++++++++++++++++++++++++++++++++++++++
3 files changed, 804 insertions(+)
create mode 100644 drivers/i2c/busses/i2c-qcom-cci.c
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index c06dce2..5841094 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -832,6 +832,16 @@ 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
+ 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_QUP
tristate "Qualcomm QUP based I2C controller"
depends on ARCH_QCOM
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 47f3ac9..c55e57c 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -83,6 +83,7 @@ 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_QUP) += i2c-qup.o
obj-$(CONFIG_I2C_RIIC) += i2c-riic.o
obj-$(CONFIG_I2C_RK3X) += i2c-rk3x.o
diff --git a/drivers/i2c/busses/i2c-qcom-cci.c b/drivers/i2c/busses/i2c-qcom-cci.c
new file mode 100644
index 0000000..080f0ca
--- /dev/null
+++ b/drivers/i2c/busses/i2c-qcom-cci.c
@@ -0,0 +1,793 @@
+/* Copyright (c) 2012-2016, The Linux Foundation. All rights reserved.
+ * Copyright (C) 2017 Linaro Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#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/platform_device.h>
+#include <linux/of.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 (1 << 0)
+#define CCI_HALT_REQ_I2C_M1_Q0Q1 (1 << 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 (1 << 0)
+#define CCI_IRQ_MASK_0_I2C_M0_Q0_REPORT (1 << 4)
+#define CCI_IRQ_MASK_0_I2C_M0_Q1_REPORT (1 << 8)
+#define CCI_IRQ_MASK_0_I2C_M1_RD_DONE (1 << 12)
+#define CCI_IRQ_MASK_0_I2C_M1_Q0_REPORT (1 << 16)
+#define CCI_IRQ_MASK_0_I2C_M1_Q1_REPORT (1 << 20)
+#define CCI_IRQ_MASK_0_RST_DONE_ACK (1 << 24)
+#define CCI_IRQ_MASK_0_I2C_M0_Q0Q1_HALT_ACK (1 << 25)
+#define CCI_IRQ_MASK_0_I2C_M1_Q0Q1_HALT_ACK (1 << 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 (1 << 0)
+#define CCI_IRQ_STATUS_0_I2C_M0_Q0_REPORT (1 << 4)
+#define CCI_IRQ_STATUS_0_I2C_M0_Q1_REPORT (1 << 8)
+#define CCI_IRQ_STATUS_0_I2C_M1_RD_DONE (1 << 12)
+#define CCI_IRQ_STATUS_0_I2C_M1_Q0_REPORT (1 << 16)
+#define CCI_IRQ_STATUS_0_I2C_M1_Q1_REPORT (1 << 20)
+#define CCI_IRQ_STATUS_0_RST_DONE_ACK (1 << 24)
+#define CCI_IRQ_STATUS_0_I2C_M0_Q0Q1_HALT_ACK (1 << 25)
+#define CCI_IRQ_STATUS_0_I2C_M1_Q0Q1_HALT_ACK (1 << 26)
+#define CCI_IRQ_STATUS_0_I2C_M0_ERROR 0x18000ee6
+#define CCI_IRQ_STATUS_0_I2C_M1_ERROR 0x60ee6000
+
+#define CCI_TIMEOUT_MS 100
+#define NUM_MASTERS 1
+#define NUM_QUEUES 2
+
+#define CCI_RES_MAX 6
+
+enum cci_i2c_cmd {
+ CCI_I2C_SET_PARAM = 1,
+ CCI_I2C_WAIT,
+ CCI_I2C_WAIT_SYNC,
+ CCI_I2C_WAIT_GPIO_EVENT,
+ CCI_I2C_TRIG_I2C_EVENT,
+ CCI_I2C_LOCK,
+ CCI_I2C_UNLOCK,
+ CCI_I2C_REPORT,
+ CCI_I2C_WRITE,
+ CCI_I2C_READ,
+ CCI_I2C_WRITE_DISABLE_P,
+ CCI_I2C_READ_DISABLE_P,
+};
+
+enum {
+ I2C_MODE_STANDARD,
+ I2C_MODE_FAST,
+ I2C_MODE_FAST_PLUS,
+};
+
+enum cci_i2c_queue_t {
+ QUEUE_0,
+ QUEUE_1
+};
+
+enum cci_i2c_master_t {
+ MASTER_0,
+ MASTER_1
+};
+
+struct resources {
+ char *clock[CCI_RES_MAX];
+ u32 clock_rate[CCI_RES_MAX];
+ char *reg[CCI_RES_MAX];
+ char *interrupt[CCI_RES_MAX];
+};
+
+struct hw_params {
+ u16 thigh;
+ u16 tlow;
+ u16 tsu_sto;
+ u16 tsu_sta;
+ u16 thd_dat;
+ u16 thd_sta;
+ u16 tbuf;
+ u8 scl_stretch_en;
+ u16 trdhld;
+ u16 tsp;
+};
+
+struct cci_clock {
+ struct clk *clk;
+ const char *name;
+ u32 freq;
+};
+
+struct cci_master {
+ u32 status;
+ u8 complete_pending;
+ struct completion irq_complete;
+};
+
+struct cci {
+ struct device *dev;
+ struct i2c_adapter adap;
+ void __iomem *base;
+ u32 irq;
+ char irq_name[30];
+ struct cci_clock *clock;
+ int nclocks;
+ u8 mode;
+ u16 queue_size[NUM_QUEUES];
+ struct cci_master master[NUM_MASTERS];
+};
+
+static const struct resources res_v1_0_8 = {
+ .clock = { "camss_top_ahb",
+ "cci_ahb",
+ "camss_ahb",
+ "cci" },
+ .clock_rate = { 0,
+ 80000000,
+ 0,
+ 19200000 },
+ .reg = { "cci" },
+ .interrupt = { "cci" }
+};
+
+static const struct resources res_v1_4_0 = {
+ .clock = { "mmss_mmagic_ahb",
+ "camss_top_ahb",
+ "cci_ahb",
+ "camss_ahb",
+ "cci" },
+ .clock_rate = { 0,
+ 0,
+ 0,
+ 0,
+ 37500000 },
+ .reg = { "cci" },
+ .interrupt = { "cci" }
+};
+
+static const struct hw_params hw_params_v1_0_8[3] = {
+ { /* 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
+ },
+ { /* 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 hw_params hw_params_v1_4_0[3] = {
+ { /* 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
+ },
+ { /* 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
+ },
+ { /* 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 u16 queue_0_size_v1_0_8 = 64;
+static const u16 queue_1_size_v1_0_8 = 16;
+
+static const u16 queue_0_size_v1_4_0 = 64;
+static const u16 queue_1_size_v1_4_0 = 16;
+
+/*
+ * cci_enable_clocks - Enable multiple clocks
+ * @nclocks: Number of clocks in clock array
+ * @clock: Clock array
+ * @dev: Device
+ *
+ * Return 0 on success or a negative error code otherwise
+ */
+int cci_enable_clocks(int nclocks, struct cci_clock *clock, struct device *dev)
+{
+ int ret;
+ int i;
+
+ for (i = 0; i < nclocks; i++) {
+ if (clock[i].freq) {
+ long rate;
+
+ rate = clk_round_rate(clock[i].clk, clock[i].freq);
+ if (rate < 0) {
+ dev_err(dev, "clk round rate failed: %ld\n",
+ rate);
+ goto error;
+ }
+
+ ret = clk_set_rate(clock[i].clk, clock[i].freq);
+ if (ret < 0) {
+ dev_err(dev, "clk set rate failed: %d\n", ret);
+ goto error;
+ }
+ }
+
+ ret = clk_prepare_enable(clock[i].clk);
+ if (ret) {
+ dev_err(dev, "clock enable failed, ret: %d\n", ret);
+ goto error;
+ }
+ }
+
+ return 0;
+
+error:
+ for (i--; i >= 0; i--)
+ clk_disable_unprepare(clock[i].clk);
+
+ return ret;
+}
+
+/*
+ * cci_disable_clocks - Disable multiple clocks
+ * @nclocks: Number of clocks in clock array
+ * @clock: Clock array
+ */
+void cci_disable_clocks(int nclocks, struct cci_clock *clock)
+{
+ int i;
+
+ for (i = nclocks - 1; i >= 0; i--)
+ clk_disable_unprepare(clock[i].clk);
+}
+
+static irqreturn_t cci_isr(int irq, void *dev)
+{
+ struct cci *cci = dev;
+ u32 val;
+
+ 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) {
+ if (cci->master[MASTER_0].complete_pending) {
+ cci->master[MASTER_0].complete_pending = 0;
+ complete(&cci->master[MASTER_0].irq_complete);
+ }
+
+ if (cci->master[MASTER_1].complete_pending) {
+ cci->master[MASTER_1].complete_pending = 0;
+ complete(&cci->master[MASTER_1].irq_complete);
+ }
+ }
+
+ 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[MASTER_0].status = 0;
+ complete(&cci->master[MASTER_0].irq_complete);
+ }
+
+ 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[MASTER_1].status = 0;
+ complete(&cci->master[MASTER_1].irq_complete);
+ }
+
+ if (unlikely(val & CCI_IRQ_STATUS_0_I2C_M0_Q0Q1_HALT_ACK)) {
+ cci->master[MASTER_0].complete_pending = 1;
+ writel(CCI_RESET_CMD_M0_MASK, cci->base + CCI_RESET_CMD);
+ }
+
+ if (unlikely(val & CCI_IRQ_STATUS_0_I2C_M1_Q0Q1_HALT_ACK)) {
+ cci->master[MASTER_1].complete_pending = 1;
+ writel(CCI_RESET_CMD_M1_MASK, cci->base + CCI_RESET_CMD);
+ }
+
+ if (unlikely(val & CCI_IRQ_STATUS_0_I2C_M0_ERROR)) {
+ dev_err_ratelimited(cci->dev, "MASTER_0 error 0x%08x\n", val);
+ cci->master[MASTER_0].status = -EIO;
+ writel(CCI_HALT_REQ_I2C_M0_Q0Q1, cci->base + CCI_HALT_REQ);
+ }
+
+ if (unlikely(val & CCI_IRQ_STATUS_0_I2C_M1_ERROR)) {
+ dev_err_ratelimited(cci->dev, "MASTER_1 error 0x%08x\n", val);
+ cci->master[MASTER_1].status = -EIO;
+ writel(CCI_HALT_REQ_I2C_M1_Q0Q1, cci->base + CCI_HALT_REQ);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int cci_reset(struct cci *cci)
+{
+ unsigned long time;
+
+ cci->master[MASTER_0].complete_pending = 1;
+ writel(CCI_RESET_CMD_MASK, cci->base + CCI_RESET_CMD);
+ time = wait_for_completion_timeout(
+ &cci->master[MASTER_0].irq_complete,
+ msecs_to_jiffies(CCI_TIMEOUT_MS));
+ if (!time) {
+ dev_err(cci->dev, "CCI reset timeout\n");
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
+static int cci_init(struct cci *cci, const struct hw_params *hw)
+{
+ 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 < NUM_MASTERS; i++) {
+ 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));
+
+ cci->master[i].status = 0;
+ }
+
+ return 0;
+}
+
+static int cci_run_queue(struct cci *cci, u8 master, u8 queue)
+{
+ unsigned long time;
+ u32 val;
+ int ret;
+
+ 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));
+
+ val = 1 << ((master * 2) + queue);
+ writel(val, cci->base + CCI_QUEUE_START);
+
+ time = wait_for_completion_timeout(&cci->master[master].irq_complete,
+ CCI_TIMEOUT_MS);
+ if (!time) {
+ dev_err(cci->dev, "master %d queue %d timeout\n",
+ master, queue);
+ return -ETIMEDOUT;
+ }
+
+ ret = cci->master[master].status;
+ if (ret < 0)
+ dev_err(cci->dev, "master %d queue %d error %d\n",
+ master, queue, ret);
+
+ return ret;
+}
+
+static int cci_validate_queue(struct cci *cci, u32 len, u8 master, u8 queue)
+{
+ int ret = 0;
+ u32 val;
+
+ val = readl(cci->base + CCI_I2C_Mm_Qn_CUR_WORD_CNT(master, queue));
+
+ if (val + len + 1 > cci->queue_size[queue]) {
+ val = CCI_I2C_REPORT | (1 << 8);
+ writel(val, cci->base + CCI_I2C_Mm_Qn_LOAD_DATA(master, queue));
+
+ ret = cci_run_queue(cci, master, queue);
+ }
+
+ return ret;
+}
+
+static int cci_i2c_read(struct cci *cci, u16 addr, u8 *buf, u16 len)
+{
+ u8 master = MASTER_0;
+ u8 queue = QUEUE_1;
+ u32 val;
+ u32 words_read, words_exp;
+ int i, index, first;
+ int ret;
+
+ if (len > cci->adap.quirks->max_read_len)
+ return -EOPNOTSUPP;
+
+ /*
+ * Call validate queue to make sure queue is empty before starting.
+ * This is to avoid overflow / underflow of queue.
+ */
+ ret = cci_validate_queue(cci, cci->queue_size[queue], master, queue);
+ if (ret < 0)
+ return ret;
+
+ val = CCI_I2C_SET_PARAM | ((addr >> 1) & 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;
+ }
+
+ index = 0;
+ first = 1;
+ do {
+ val = readl(cci->base + CCI_I2C_Mm_READ_DATA(master));
+
+ for (i = 0; i < 4 && index < len; i++) {
+ if (first) {
+ first = 0;
+ continue;
+ }
+ buf[index++] = (val >> (i * 8)) & 0xff;
+ }
+ } while (--words_read);
+
+ return 0;
+}
+
+static int cci_i2c_write(struct cci *cci, u16 addr, u8 *buf, u16 len)
+{
+ u8 master = MASTER_0;
+ u8 queue = QUEUE_0;
+ u8 load[12] = { 0 };
+ u8 i, j;
+ u32 val;
+ int ret;
+
+ if (len > cci->adap.quirks->max_write_len)
+ return -EOPNOTSUPP;
+
+ /*
+ * Call validate queue to make sure queue is empty before starting.
+ * This is to avoid overflow / underflow of queue.
+ */
+ ret = cci_validate_queue(cci, cci->queue_size[queue], master, queue);
+ if (ret < 0)
+ return ret;
+
+ val = CCI_I2C_SET_PARAM | ((addr >> 1) & 0x7f) << 4;
+ writel(val, cci->base + CCI_I2C_Mm_Qn_LOAD_DATA(master, queue));
+
+ i = 0;
+ 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 | 1 << 8;
+ 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 *cci = i2c_get_adapdata(adap);
+ int i;
+ int ret = 0;
+
+ if (!num)
+ return -EOPNOTSUPP;
+
+ for (i = 0; i < num; i++) {
+ if (msgs[i].flags & I2C_M_RD)
+ ret = cci_i2c_read(cci, msgs[i].addr, msgs[i].buf,
+ msgs[i].len);
+ else
+ ret = cci_i2c_write(cci, msgs[i].addr, msgs[i].buf,
+ msgs[i].len);
+
+ if (ret < 0) {
+ dev_err(cci->dev, "cci i2c xfer error %d", ret);
+ break;
+ }
+ }
+
+ return ret;
+}
+
+static u32 cci_func(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_I2C;
+}
+
+static const struct i2c_algorithm cci_algo = {
+ .master_xfer = cci_xfer,
+ .functionality = cci_func,
+};
+
+static const struct i2c_adapter_quirks cci_quirks_v1_0_8 = {
+ .max_write_len = 10,
+ .max_read_len = 12,
+};
+
+static const struct i2c_adapter_quirks cci_quirks_v1_4_0 = {
+ .max_write_len = 11,
+ .max_read_len = 12,
+};
+
+/*
+ * cci_probe - Probe CCI platform device
+ * @pdev: Pointer to CCI platform device
+ *
+ * Return 0 on success or a negative error code on failure
+ */
+static int cci_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ const struct resources *res;
+ const struct hw_params *hw;
+ struct cci *cci;
+ struct resource *r;
+ int ret = 0;
+ u32 val;
+ int i;
+
+ cci = devm_kzalloc(&pdev->dev, sizeof(*cci), GFP_KERNEL);
+ if (!cci)
+ return -ENOMEM;
+
+ cci->dev = dev;
+ platform_set_drvdata(pdev, cci);
+
+ if (of_device_is_compatible(dev->of_node, "qcom,cci-v1.0.8")) {
+ res = &res_v1_0_8;
+ hw = hw_params_v1_0_8;
+ cci->queue_size[0] = queue_0_size_v1_0_8;
+ cci->queue_size[1] = queue_1_size_v1_0_8;
+ cci->adap.quirks = &cci_quirks_v1_0_8;
+ } else if (of_device_is_compatible(dev->of_node, "qcom,cci-v1.4.0")) {
+ res = &res_v1_4_0;
+ hw = hw_params_v1_4_0;
+ cci->queue_size[0] = queue_0_size_v1_4_0;
+ cci->queue_size[1] = queue_1_size_v1_4_0;
+ cci->adap.quirks = &cci_quirks_v1_4_0;
+ } else {
+ return -EINVAL;
+ }
+
+ cci->adap.algo = &cci_algo;
+ cci->adap.dev.parent = cci->dev;
+ cci->adap.dev.of_node = dev->of_node;
+ i2c_set_adapdata(&cci->adap, cci);
+
+ strlcpy(cci->adap.name, "Qualcomm Camera Control Interface",
+ sizeof(cci->adap.name));
+
+ cci->mode = I2C_MODE_STANDARD;
+ ret = of_property_read_u32(pdev->dev.of_node, "clock-frequency", &val);
+ if (!ret) {
+ if (val == 400000)
+ cci->mode = I2C_MODE_FAST;
+ else if (val == 1000000)
+ cci->mode = I2C_MODE_FAST_PLUS;
+ }
+
+ /* Memory */
+
+ r = platform_get_resource_byname(pdev, IORESOURCE_MEM, res->reg[0]);
+ cci->base = devm_ioremap_resource(dev, r);
+ if (IS_ERR(cci->base)) {
+ dev_err(dev, "could not map memory\n");
+ return PTR_ERR(cci->base);
+ }
+
+ /* Interrupt */
+
+ r = platform_get_resource_byname(pdev, IORESOURCE_IRQ,
+ res->interrupt[0]);
+ if (!r) {
+ dev_err(dev, "missing IRQ\n");
+ return -EINVAL;
+ }
+
+ cci->irq = r->start;
+ snprintf(cci->irq_name, sizeof(cci->irq_name), "%s", dev_name(dev));
+ ret = devm_request_irq(dev, cci->irq, cci_isr,
+ IRQF_TRIGGER_RISING, cci->irq_name, cci);
+ if (ret < 0) {
+ dev_err(dev, "request_irq failed, ret: %d\n", ret);
+ return ret;
+ }
+
+ disable_irq(cci->irq);
+
+ /* Clocks */
+
+ cci->nclocks = 0;
+ while (res->clock[cci->nclocks])
+ cci->nclocks++;
+
+ cci->clock = devm_kzalloc(dev, cci->nclocks *
+ sizeof(*cci->clock), GFP_KERNEL);
+ if (!cci->clock)
+ return -ENOMEM;
+
+ for (i = 0; i < cci->nclocks; i++) {
+ struct cci_clock *clock = &cci->clock[i];
+
+ clock->clk = devm_clk_get(dev, res->clock[i]);
+ if (IS_ERR(clock->clk))
+ return PTR_ERR(clock->clk);
+
+ clock->name = res->clock[i];
+ clock->freq = res->clock_rate[i];
+ }
+
+ ret = cci_enable_clocks(cci->nclocks, cci->clock, dev);
+ if (ret < 0)
+ return ret;
+
+ val = readl_relaxed(cci->base + CCI_HW_VERSION);
+ dev_info(dev, "%s: CCI HW version = 0x%08x", __func__, val);
+
+ init_completion(&cci->master[0].irq_complete);
+ init_completion(&cci->master[1].irq_complete);
+
+ enable_irq(cci->irq);
+
+ ret = cci_reset(cci);
+ if (ret < 0)
+ return ret;
+
+ ret = cci_init(cci, &hw[cci->mode]);
+ if (ret < 0)
+ return ret;
+
+ ret = i2c_add_adapter(&cci->adap);
+
+ return ret;
+}
+
+/*
+ * cci_remove - Remove CCI platform device
+ * @pdev: Pointer to CCI platform device
+ *
+ * Always returns 0.
+ */
+static int cci_remove(struct platform_device *pdev)
+{
+ struct cci *cci = platform_get_drvdata(pdev);
+
+ disable_irq(cci->irq);
+ cci_disable_clocks(cci->nclocks, cci->clock);
+
+ i2c_del_adapter(&cci->adap);
+
+ return 0;
+}
+
+static const struct of_device_id cci_dt_match[] = {
+ { .compatible = "qcom,cci-v1.0.8" },
+ { .compatible = "qcom,cci-v1.4.0" },
+ {}
+};
+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,
+ },
+};
+
+module_platform_driver(qcom_cci_driver);
+
+MODULE_ALIAS("platform:i2c-qcom-cci");
+MODULE_DESCRIPTION("Qualcomm Camera Control Interface driver");
+MODULE_AUTHOR("Todor Tomov <todor.tomov@xxxxxxxxxx>");
+MODULE_LICENSE("GPL v2");
--
2.7.4
