Message-Id: <1507892203-17033-3-git-send-email-todor.tomov@linaro.org>
Date:   Fri, 13 Oct 2017 13:56:41 +0300
From:   Todor Tomov <todor.tomov@...aro.org>
To:     wsa@...-dreams.de, linux-i2c@...r.kernel.org
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Todor Tomov <todor.tomov@...aro.org>
Subject: [PATCH v2 2/4] i2c: Add Qualcomm Camera Control Interface driver

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@...aro.org>
---
 drivers/i2c/busses/Kconfig        |  10 +
 drivers/i2c/busses/Makefile       |   1 +
 drivers/i2c/busses/i2c-qcom-cci.c | 789 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 800 insertions(+)
 create mode 100644 drivers/i2c/busses/i2c-qcom-cci.c

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 45a3f3ca..7becfe7 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -833,6 +833,16 @@ 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..0aadea1
--- /dev/null
+++ b/drivers/i2c/busses/i2c-qcom-cci.c
@@ -0,0 +1,789 @@
+/* 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	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_ERROR		0x18000ee6
+#define CCI_IRQ_STATUS_0_I2C_M1_ERROR		0x60ee6000
+
+#define CCI_TIMEOUT_MS 100
+#define NUM_MASTERS 1
+#define NUM_QUEUES 2
+
+/* Max number of resources + 1 for a NULL terminator */
+#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
+};
+
+struct cci_res {
+	char *clock[CCI_RES_MAX];
+	u32 clock_rate[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 {
+	int status;
+	bool complete_pending;
+	struct completion irq_complete;
+};
+
+struct cci {
+	struct device *dev;
+	struct i2c_adapter adap;
+	void __iomem *base;
+	u32 irq;
+	struct clk_bulk_data *clock;
+	u32 *clock_freq;
+	int nclocks;
+	u16 queue_size[NUM_QUEUES];
+	struct cci_master master[NUM_MASTERS];
+};
+
+static const struct cci_res res_v1_0_8 = {
+	.clock = { "camss_top_ahb",
+		   "cci_ahb",
+		   "camss_ahb",
+		   "cci" },
+	.clock_rate = { 0,
+			80000000,
+			0,
+			19200000 }
+};
+
+static const struct cci_res res_v1_4_0 = {
+	.clock = { "mmss_mmagic_ahb",
+		   "camss_top_ahb",
+		   "cci_ahb",
+		   "camss_ahb",
+		   "cci" },
+	.clock_rate = { 0,
+			0,
+			0,
+			0,
+			37500000 }
+};
+
+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_clock_set_rate() - Set clock frequency rates
+ * @nclocks: Number of clocks
+ * @clock: Clock array
+ * @clock_freq: Clock frequency rate array
+ * @dev: Device
+ *
+ * Return 0 on success or a negative error code otherwise
+ */
+int cci_clock_set_rate(int nclocks, struct clk_bulk_data *clock,
+		       u32 *clock_freq, struct device *dev)
+{
+	int i;
+
+	for (i = 0; i < nclocks; i++)
+		if (clock_freq[i]) {
+			long rate;
+			int ret;
+
+			rate = clk_round_rate(clock[i].clk, clock_freq[i]);
+			if (rate < 0) {
+				dev_err(dev, "clk round rate failed: %ld\n",
+					rate);
+				return rate;
+			}
+
+			ret = clk_set_rate(clock[i].clk, clock_freq[i]);
+			if (ret < 0) {
+				dev_err(dev, "clk set rate failed: %d\n", ret);
+				return ret;
+			}
+		}
+
+	return 0;
+}
+
+static irqreturn_t cci_isr(int irq, void *dev)
+{
+	struct cci *cci = dev;
+	u32 reset = 0;
+	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[0].complete_pending) {
+			cci->master[0].complete_pending = false;
+			complete(&cci->master[0].irq_complete);
+		}
+
+		if (cci->master[1].complete_pending) {
+			cci->master[1].complete_pending = false;
+			complete(&cci->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[0].status = 0;
+		complete(&cci->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[1].status = 0;
+		complete(&cci->master[1].irq_complete);
+	}
+
+	if (unlikely(val & CCI_IRQ_STATUS_0_I2C_M0_Q0Q1_HALT_ACK)) {
+		cci->master[0].complete_pending = true;
+		reset = CCI_RESET_CMD_M0_MASK;
+	}
+
+	if (unlikely(val & CCI_IRQ_STATUS_0_I2C_M1_Q0Q1_HALT_ACK)) {
+		cci->master[1].complete_pending = true;
+		reset = CCI_RESET_CMD_M1_MASK;
+	}
+
+	if (unlikely(reset))
+		writel(reset, 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[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[1].status = -EIO;
+		writel(CCI_HALT_REQ_I2C_M1_Q0Q1, cci->base + CCI_HALT_REQ);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void cci_halt(struct cci *cci)
+{
+	unsigned long time;
+	u32 val = CCI_HALT_REQ_I2C_M0_Q0Q1 | CCI_HALT_REQ_I2C_M1_Q0Q1;
+
+	cci->master[0].complete_pending = true;
+	writel(val, cci->base + CCI_HALT_REQ);
+	time = wait_for_completion_timeout(
+				&cci->master[0].irq_complete,
+				msecs_to_jiffies(CCI_TIMEOUT_MS));
+	if (!time)
+		dev_err(cci->dev, "CCI halt timeout\n");
+}
+
+static int cci_reset(struct cci *cci)
+{
+	unsigned long time;
+
+	cci->master[0].complete_pending = true;
+	writel(CCI_RESET_CMD_MASK, cci->base + CCI_RESET_CMD);
+	time = wait_for_completion_timeout(
+				&cci->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));
+	}
+
+	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 = BIT(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);
+
+		cci_halt(cci);
+
+		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, u8 master, u8 queue)
+{
+	int ret = 0;
+	u32 val;
+
+	val = readl(cci->base + CCI_I2C_Mm_Qn_CUR_WORD_CNT(master, queue));
+
+	if (val == cci->queue_size[queue])
+		return -EINVAL;
+
+	if (val) {
+		val = CCI_I2C_REPORT | BIT(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 = 0;
+	u8 queue = QUEUE_1;
+	u32 val;
+	u32 words_read, words_exp;
+	int i, index;
+	bool first;
+	int ret;
+
+	/*
+	 * 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 >> 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 = true;
+	do {
+		val = readl(cci->base + CCI_I2C_Mm_READ_DATA(master));
+
+		for (i = 0; i < 4 && index < len; i++) {
+			if (first) {
+				first = false;
+				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 = 0;
+	u8 queue = QUEUE_0;
+	u8 load[12] = { 0 };
+	int i, j;
+	u32 val;
+	int ret;
+
+	/*
+	 * 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 >> 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 | BIT(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;
+
+	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;
+		}
+	}
+
+	if (!ret)
+		ret = num;
+
+	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 cci_res *res;
+	const struct hw_params *hw;
+	struct cci *cci;
+	struct resource *r;
+	int ret = 0;
+	u8 mode;
+	u32 val;
+	int i;
+
+	cci = devm_kzalloc(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));
+
+	mode = I2C_MODE_STANDARD;
+	ret = of_property_read_u32(pdev->dev.of_node, "clock-frequency", &val);
+	if (!ret) {
+		if (val == 400000)
+			mode = I2C_MODE_FAST;
+		else if (val == 1000000)
+			mode = I2C_MODE_FAST_PLUS;
+	}
+
+	/* Memory */
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 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 */
+
+	cci->irq = platform_get_irq(pdev, 0);
+	if (cci->irq < 0) {
+		dev_err(dev, "missing IRQ\n");
+		return cci->irq;
+	}
+
+	ret = devm_request_irq(dev, cci->irq, cci_isr,
+			       IRQF_TRIGGER_RISING, dev_name(dev), 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;
+
+	cci->clock_freq = devm_kzalloc(dev, cci->nclocks *
+				       sizeof(*cci->clock_freq), GFP_KERNEL);
+	if (!cci->clock_freq)
+		return -ENOMEM;
+
+	for (i = 0; i < cci->nclocks; i++) {
+		struct clk_bulk_data *clock = &cci->clock[i];
+
+		clock->clk = devm_clk_get(dev, res->clock[i]);
+		if (IS_ERR(clock->clk))
+			return PTR_ERR(clock->clk);
+
+		clock->id = res->clock[i];
+		cci->clock_freq[i] = res->clock_rate[i];
+	}
+
+	ret = cci_clock_set_rate(cci->nclocks, cci->clock,
+				 cci->clock_freq, dev);
+	if (ret < 0)
+		return ret;
+
+	ret = clk_bulk_prepare_enable(cci->nclocks, cci->clock);
+	if (ret < 0)
+		return ret;
+
+	val = readl_relaxed(cci->base + CCI_HW_VERSION);
+	dev_dbg(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)
+		goto error;
+
+	ret = cci_init(cci, &hw[mode]);
+	if (ret < 0)
+		goto error;
+
+	ret = i2c_add_adapter(&cci->adap);
+	if (ret < 0)
+		goto error;
+
+	return 0;
+
+error:
+	clk_bulk_disable_unprepare(cci->nclocks, cci->clock);
+
+	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);
+	clk_bulk_disable_unprepare(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_DESCRIPTION("Qualcomm Camera Control Interface driver");
+MODULE_AUTHOR("Todor Tomov <todor.tomov@...aro.org>");
+MODULE_LICENSE("GPL v2");
-- 
2.7.4

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