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Message-ID: <8db0057e-fb23-48d6-5b8d-586c62b7683a@hisilicon.com>
Date: Wed, 16 Nov 2016 16:00:29 +0800
From: Jiancheng Xue <xuejiancheng@...ilicon.com>
To: <wsa@...-dreams.de>
CC: Pan Wen <wenpan@...ilicon.com>, <robh+dt@...nel.org>,
<mark.rutland@....com>, <linux-i2c@...r.kernel.org>,
<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<howell.yang@...ilicon.com>, <jalen.hsu@...ilicon.com>,
<lvkuanliang@...ilicon.com>, <suwenping@...ilicon.com>,
<raojun@...ilicon.com>, <kevin.lixu@...ilicon.com>
Subject: Re: [PATCH resend v4] i2c: hibvt: add Hisilicon BVT I2C controller
driver
Hi Wolfram,
On 2016/10/21 16:17, Pan Wen wrote:
> add Hisilicon BVT I2C controller driver support.
>
> Signed-off-by: Pan Wen <wenpan@...ilicon.com>
> Acked-by: Rob Herring <robh@...nel.org>
> ---
> change log
> v4:
> Modify the default frequency to 100KHz.
> v3:
> Add a SoC specific compatible string.
> v2:
> 1)Fixed a compile error.
> 2)Dropped the clock-names property.
> .../devicetree/bindings/i2c/i2c-hibvt.txt | 24 +
> drivers/i2c/busses/Kconfig | 10 +
> drivers/i2c/busses/Makefile | 1 +
> drivers/i2c/busses/i2c-hibvt.c | 737 +++++++++++++++++++++
> 4 files changed, 772 insertions(+)
Could you give us some comments on this patch?
If there are some issues about it, please let us know.
Thank you very much!
Best Regards,
Jiancheng
> create mode 100644 Documentation/devicetree/bindings/i2c/i2c-hibvt.txt
> create mode 100644 drivers/i2c/busses/i2c-hibvt.c
>
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-hibvt.txt b/Documentation/devicetree/bindings/i2c/i2c-hibvt.txt
> new file mode 100644
> index 0000000..db3d2e2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i2c/i2c-hibvt.txt
> @@ -0,0 +1,24 @@
> +Hisilicon BVT I2C master controller
> +
> +Required properties:
> +- compatible: should be "hisilicon,hibvt-i2c" and one of the following:
> + "hisilicon,hi3516cv300-i2c"
> +- reg: physical base address of the controller and length of memory mapped.
> + region.
> +- interrupts: interrupt number to the cpu.
> +- clocks: phandles to input clocks.
> +
> +Optional properties:
> +- clock-frequency: Desired I2C bus frequency in Hz, otherwise defaults to 100000.
> +
> +Other properties:
> +see Documentation/devicetree/bindings/i2c/i2c.txt.
> +
> +Examples:
> +i2c_bus0: i2c@...10000 {
> + compatible = "hisilicon,hi3516cv300-i2c", "hisilicon,hibvt-i2c";
> + reg = <0x12110000 0x100>;
> + interrupts = <20>;
> + clocks = <&crg_ctrl HI3516CV300_APB_CLK>;
> + clock-frequency = <100000>;
> +};
> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> index 5c3993b..fc1b679 100644
> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -555,6 +555,16 @@ config I2C_GPIO
> This is a very simple bitbanging I2C driver utilizing the
> arch-neutral GPIO API to control the SCL and SDA lines.
>
> +config I2C_HIBVT
> + tristate "Hisilicon BVT I2C Controller"
> + depends on ARCH_HISI
> + help
> + Say Y here to include support for Hisilicon BVT I2C controller in the
> + Hisilicon BVT SoCs.
> +
> + This driver can also be built as a module. If so, the module
> + will be called i2c-hibvt.
> +
> config I2C_HIGHLANDER
> tristate "Highlander FPGA SMBus interface"
> depends on SH_HIGHLANDER
> diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
> index 37f2819..42ef2e0 100644
> --- a/drivers/i2c/busses/Makefile
> +++ b/drivers/i2c/busses/Makefile
> @@ -51,6 +51,7 @@ obj-$(CONFIG_I2C_EG20T) += i2c-eg20t.o
> obj-$(CONFIG_I2C_EMEV2) += i2c-emev2.o
> obj-$(CONFIG_I2C_EXYNOS5) += i2c-exynos5.o
> obj-$(CONFIG_I2C_GPIO) += i2c-gpio.o
> +obj-$(CONFIG_I2C_HIBVT) += i2c-hibvt.o
> obj-$(CONFIG_I2C_HIGHLANDER) += i2c-highlander.o
> obj-$(CONFIG_I2C_HIX5HD2) += i2c-hix5hd2.o
> obj-$(CONFIG_I2C_IBM_IIC) += i2c-ibm_iic.o
> diff --git a/drivers/i2c/busses/i2c-hibvt.c b/drivers/i2c/busses/i2c-hibvt.c
> new file mode 100644
> index 0000000..e8af63e
> --- /dev/null
> +++ b/drivers/i2c/busses/i2c-hibvt.c
> @@ -0,0 +1,737 @@
> +/*
> + * Hisilicon BVT I2C Controller Driver
> + *
> + * Copyright (c) 2016 HiSilicon Technologies Co., Ltd.
> + *
> + * Authors: wenpan@...ilicon.com
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; either version 2 of the License, or (at your
> + * option) any later version.
> + *
> + * 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.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program. If not, see <http://www.gnu.org/licenses/>.
> + *
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/i2c.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +
> +/*
> + * I2C Registers offsets
> + */
> +#define HIBVT_I2C_GLB 0x0
> +#define HIBVT_I2C_SCL_H 0x4
> +#define HIBVT_I2C_SCL_L 0x8
> +#define HIBVT_I2C_DATA1 0x10
> +#define HIBVT_I2C_TXF 0x20
> +#define HIBVT_I2C_RXF 0x24
> +#define HIBVT_I2C_CMD_BASE 0x30
> +#define HIBVT_I2C_LOOP1 0xb0
> +#define HIBVT_I2C_DST1 0xb4
> +#define HIBVT_I2C_TX_WATER 0xc8
> +#define HIBVT_I2C_RX_WATER 0xcc
> +#define HIBVT_I2C_CTRL1 0xd0
> +#define HIBVT_I2C_STAT 0xd8
> +#define HIBVT_I2C_INTR_RAW 0xe0
> +#define HIBVT_I2C_INTR_EN 0xe4
> +#define HIBVT_I2C_INTR_STAT 0xe8
> +
> +/*
> + * I2C Global Config Register -- HIBVT_I2C_GLB
> + */
> +#define GLB_EN_MASK BIT(0)
> +#define GLB_SDA_HOLD_MASK GENMASK(23, 8)
> +#define GLB_SDA_HOLD_SHIFT (8)
> +
> +/*
> + * I2C Timing CMD Register -- HIBVT_I2C_CMD_BASE + n * 4 (n = 0, 1, 2, ... 31)
> + */
> +#define CMD_EXIT 0x0
> +#define CMD_TX_S 0x1
> +#define CMD_TX_D1_2 0x4
> +#define CMD_TX_D1_1 0x5
> +#define CMD_TX_FIFO 0x9
> +#define CMD_RX_FIFO 0x12
> +#define CMD_RX_ACK 0x13
> +#define CMD_IGN_ACK 0x15
> +#define CMD_TX_ACK 0x16
> +#define CMD_TX_NACK 0x17
> +#define CMD_JMP1 0x18
> +#define CMD_UP_TXF 0x1d
> +#define CMD_TX_RS 0x1e
> +#define CMD_TX_P 0x1f
> +
> +/*
> + * I2C Control Register 1 -- HIBVT_I2C_CTRL1
> + */
> +#define CTRL1_CMD_START_MASK BIT(0)
> +
> +/*
> + * I2C Status Register -- HIBVT_I2C_STAT
> + */
> +#define STAT_RXF_NOE_MASK BIT(16) /* RX FIFO not empty flag */
> +#define STAT_TXF_NOF_MASK BIT(19) /* TX FIFO not full flag */
> +
> +
> +/*
> + * I2C Interrupt status and mask Register --
> + * HIBVT_I2C_INTR_RAW, HIBVT_I2C_STAT, HIBVT_I2C_INTR_STAT
> + */
> +#define INTR_ABORT_MASK (BIT(0) | BIT(11))
> +#define INTR_RX_MASK BIT(2)
> +#define INTR_TX_MASK BIT(4)
> +#define INTR_CMD_DONE_MASK BIT(12)
> +#define INTR_USE_MASK (INTR_ABORT_MASK \
> + |INTR_RX_MASK \
> + | INTR_TX_MASK \
> + | INTR_CMD_DONE_MASK)
> +#define INTR_ALL_MASK GENMASK(31, 0)
> +
> +#define I2C_DEFAULT_FREQUENCY 100000
> +#define I2C_TXF_DEPTH 64
> +#define I2C_RXF_DEPTH 64
> +#define I2C_TXF_WATER 32
> +#define I2C_RXF_WATER 32
> +#define I2C_WAIT_TIMEOUT 0x10000
> +#define I2C_IRQ_TIMEOUT (msecs_to_jiffies(1000))
> +
> +
> +struct hibvt_i2c_dev {
> + struct device *dev;
> + struct i2c_adapter adap;
> + void __iomem *base;
> + struct clk *clk;
> + int irq;
> +
> + unsigned int freq;
> + struct i2c_msg *msg;
> + unsigned int msg_num;
> + unsigned int msg_idx;
> + unsigned int msg_buf_ptr;
> + struct completion msg_complete;
> +
> + spinlock_t lock;
> + int status;
> +};
> +
> +static inline void hibvt_i2c_disable(struct hibvt_i2c_dev *i2c)
> +{
> + unsigned int val;
> +
> + val = readl(i2c->base + HIBVT_I2C_GLB);
> + val &= ~GLB_EN_MASK;
> + writel(val, i2c->base + HIBVT_I2C_GLB);
> +}
> +
> +static inline void hibvt_i2c_enable(struct hibvt_i2c_dev *i2c)
> +{
> + unsigned int val;
> +
> + val = readl(i2c->base + HIBVT_I2C_GLB);
> + val |= GLB_EN_MASK;
> + writel(val, i2c->base + HIBVT_I2C_GLB);
> +}
> +
> +static inline void hibvt_i2c_cfg_irq(struct hibvt_i2c_dev *i2c,
> + unsigned int flag)
> +{
> + writel(flag, i2c->base + HIBVT_I2C_INTR_EN);
> +}
> +
> +static inline void hibvt_i2c_disable_irq(struct hibvt_i2c_dev *i2c,
> + unsigned int flag)
> +{
> + unsigned int val;
> +
> + val = readl(i2c->base + HIBVT_I2C_INTR_EN);
> + val &= ~flag;
> + writel(val, i2c->base + HIBVT_I2C_INTR_EN);
> +}
> +
> +static inline unsigned int hibvt_i2c_clr_irq(struct hibvt_i2c_dev *i2c)
> +{
> + unsigned int val;
> +
> + val = readl(i2c->base + HIBVT_I2C_INTR_STAT);
> + writel(INTR_ALL_MASK, i2c->base + HIBVT_I2C_INTR_RAW);
> +
> + return val;
> +}
> +
> +static inline void hibvt_i2c_cmdreg_set(struct hibvt_i2c_dev *i2c,
> + unsigned int cmd, unsigned int *offset)
> +{
> + dev_dbg(i2c->dev, "hii2c reg: offset=0x%x, cmd=0x%x...\n",
> + *offset * 4, cmd);
> + writel(cmd, i2c->base + HIBVT_I2C_CMD_BASE + *offset * 4);
> + (*offset)++;
> +}
> +
> +/*
> + * config i2c slave addr
> + */
> +static inline void hibvt_i2c_set_addr(struct hibvt_i2c_dev *i2c)
> +{
> + struct i2c_msg *msg = i2c->msg;
> + u16 addr;
> +
> + if (msg->flags & I2C_M_TEN) {
> + /* First byte is 11110XX0 where XX is upper 2 bits */
> + addr = ((msg->addr & 0x300) << 1) | 0xf000;
> + if (msg->flags & I2C_M_RD)
> + addr |= 1 << 8;
> +
> + /* Second byte is the remaining 8 bits */
> + addr |= msg->addr & 0xff;
> + } else {
> + addr = (msg->addr & 0x7f) << 1;
> + if (msg->flags & I2C_M_RD)
> + addr |= 1;
> + }
> +
> + writel(addr, i2c->base + HIBVT_I2C_DATA1);
> +}
> +
> +/*
> + * Start command sequence
> + */
> +static inline void hibvt_i2c_start_cmd(struct hibvt_i2c_dev *i2c)
> +{
> + unsigned int val;
> +
> + val = readl(i2c->base + HIBVT_I2C_CTRL1);
> + val |= CTRL1_CMD_START_MASK;
> + writel(val, i2c->base + HIBVT_I2C_CTRL1);
> +}
> +
> +static int hibvt_i2c_wait_rx_noempty(struct hibvt_i2c_dev *i2c)
> +{
> + unsigned int time_cnt = 0;
> + unsigned int val;
> +
> + do {
> + val = readl(i2c->base + HIBVT_I2C_STAT);
> + if (val & STAT_RXF_NOE_MASK)
> + return 0;
> +
> + udelay(50);
> + } while (time_cnt++ < I2C_WAIT_TIMEOUT);
> +
> + dev_err(i2c->dev, "wait rx no empty timeout, RIS: 0x%x, SR: 0x%x\n",
> + readl(i2c->base + HIBVT_I2C_INTR_RAW), val);
> + return -EIO;
> +}
> +
> +static int hibvt_i2c_wait_tx_nofull(struct hibvt_i2c_dev *i2c)
> +{
> + unsigned int time_cnt = 0;
> + unsigned int val;
> +
> + do {
> + val = readl(i2c->base + HIBVT_I2C_STAT);
> + if (val & STAT_TXF_NOF_MASK)
> + return 0;
> +
> + udelay(50);
> + } while (time_cnt++ < I2C_WAIT_TIMEOUT);
> +
> + dev_err(i2c->dev, "wait rx no empty timeout, RIS: 0x%x, SR: 0x%x\n",
> + readl(i2c->base + HIBVT_I2C_INTR_RAW), val);
> + return -EIO;
> +}
> +
> +static int hibvt_i2c_wait_idle(struct hibvt_i2c_dev *i2c)
> +{
> + unsigned int time_cnt = 0;
> + unsigned int val;
> +
> + do {
> + val = readl(i2c->base + HIBVT_I2C_INTR_RAW);
> + if (val & (INTR_ABORT_MASK)) {
> + dev_err(i2c->dev, "wait idle abort!, RIS: 0x%x\n",
> + val);
> + return -EIO;
> + }
> +
> + if (val & INTR_CMD_DONE_MASK)
> + return 0;
> +
> + udelay(50);
> + } while (time_cnt++ < I2C_WAIT_TIMEOUT);
> +
> + dev_err(i2c->dev, "wait idle timeout, RIS: 0x%x, SR: 0x%x\n",
> + val, readl(i2c->base + HIBVT_I2C_STAT));
> +
> + return -EIO;
> +}
> +
> +static void hibvt_i2c_set_freq(struct hibvt_i2c_dev *i2c)
> +{
> + unsigned int max_freq, freq;
> + unsigned int clk_rate;
> + unsigned int val, sda_hold;
> +
> + freq = i2c->freq;
> + clk_rate = clk_get_rate(i2c->clk);
> + max_freq = clk_rate >> 1;
> +
> + if (freq > max_freq) {
> + i2c->freq = max_freq;
> + freq = i2c->freq;
> + }
> +
> + if (freq <= 100000) {
> + val = clk_rate / (freq * 2) - 1;
> + writel(val, i2c->base + HIBVT_I2C_SCL_H);
> + writel(val, i2c->base + HIBVT_I2C_SCL_L);
> + } else {
> + val = (clk_rate * 36) / (freq * 100);
> + writel(val, i2c->base + HIBVT_I2C_SCL_H);
> + val = (clk_rate * 64) / (freq * 100);
> + writel(val, i2c->base + HIBVT_I2C_SCL_L);
> + }
> +
> + sda_hold = val * 3 / 10;
> + sda_hold = (sda_hold << GLB_SDA_HOLD_SHIFT) & GLB_SDA_HOLD_MASK;
> + val = readl(i2c->base + HIBVT_I2C_GLB);
> + val &= ~GLB_SDA_HOLD_MASK;
> + val |= sda_hold;
> + writel(val, i2c->base + HIBVT_I2C_GLB);
> +}
> +
> +/*
> + * set i2c controller TX and RX FIFO water
> + */
> +static inline void hibvt_i2c_set_water(struct hibvt_i2c_dev *i2c)
> +{
> + writel(I2C_TXF_WATER, i2c->base + HIBVT_I2C_TX_WATER);
> + writel(I2C_RXF_WATER, i2c->base + HIBVT_I2C_RX_WATER);
> +}
> +
> +/*
> + * initialise the controller, set i2c bus interface freq
> + */
> +static void hibvt_i2c_hw_init(struct hibvt_i2c_dev *i2c)
> +{
> + hibvt_i2c_disable(i2c);
> + hibvt_i2c_disable_irq(i2c, INTR_ALL_MASK);
> + hibvt_i2c_set_freq(i2c);
> + hibvt_i2c_set_water(i2c);
> +}
> +
> +/*
> + * hibvt_i2c_cfg_cmd - config i2c controller command sequence
> + *
> + * After all the timing command is configured,
> + * and then start the command, you can i2c communication,
> + * and then only need to read and write i2c fifo.
> + */
> +static void hibvt_i2c_cfg_cmd(struct hibvt_i2c_dev *i2c)
> +{
> + struct i2c_msg *msg = i2c->msg;
> + int offset = 0;
> +
> + if (i2c->msg_idx == 0)
> + hibvt_i2c_cmdreg_set(i2c, CMD_TX_S, &offset);
> + else
> + hibvt_i2c_cmdreg_set(i2c, CMD_TX_RS, &offset);
> +
> + if (msg->flags & I2C_M_TEN) {
> + if (i2c->msg_idx == 0) {
> + hibvt_i2c_cmdreg_set(i2c, CMD_TX_D1_2, &offset);
> + hibvt_i2c_cmdreg_set(i2c, CMD_TX_D1_1, &offset);
> + } else {
> + hibvt_i2c_cmdreg_set(i2c, CMD_TX_D1_2, &offset);
> + }
> + } else {
> + hibvt_i2c_cmdreg_set(i2c, CMD_TX_D1_1, &offset);
> + }
> +
> + if (msg->flags & I2C_M_IGNORE_NAK)
> + hibvt_i2c_cmdreg_set(i2c, CMD_IGN_ACK, &offset);
> + else
> + hibvt_i2c_cmdreg_set(i2c, CMD_RX_ACK, &offset);
> +
> + if (msg->flags & I2C_M_RD) {
> + if (msg->len >= 2) {
> + writel(offset, i2c->base + HIBVT_I2C_DST1);
> + writel(msg->len - 2, i2c->base + HIBVT_I2C_LOOP1);
> + hibvt_i2c_cmdreg_set(i2c, CMD_RX_FIFO, &offset);
> + hibvt_i2c_cmdreg_set(i2c, CMD_TX_ACK, &offset);
> + hibvt_i2c_cmdreg_set(i2c, CMD_JMP1, &offset);
> + }
> + hibvt_i2c_cmdreg_set(i2c, CMD_RX_FIFO, &offset);
> + hibvt_i2c_cmdreg_set(i2c, CMD_TX_NACK, &offset);
> + } else {
> + writel(offset, i2c->base + HIBVT_I2C_DST1);
> + writel(msg->len - 1, i2c->base + HIBVT_I2C_LOOP1);
> + hibvt_i2c_cmdreg_set(i2c, CMD_UP_TXF, &offset);
> + hibvt_i2c_cmdreg_set(i2c, CMD_TX_FIFO, &offset);
> +
> + if (msg->flags & I2C_M_IGNORE_NAK)
> + hibvt_i2c_cmdreg_set(i2c, CMD_IGN_ACK, &offset);
> + else
> + hibvt_i2c_cmdreg_set(i2c, CMD_RX_ACK, &offset);
> +
> + hibvt_i2c_cmdreg_set(i2c, CMD_JMP1, &offset);
> + }
> +
> + if ((i2c->msg_idx == (i2c->msg_num - 1)) || (msg->flags & I2C_M_STOP)) {
> + dev_dbg(i2c->dev, "run to %s %d...TX STOP\n",
> + __func__, __LINE__);
> + hibvt_i2c_cmdreg_set(i2c, CMD_TX_P, &offset);
> + }
> +
> + hibvt_i2c_cmdreg_set(i2c, CMD_EXIT, &offset);
> +}
> +
> +static int hibvt_i2c_polling_xfer_one_msg(struct hibvt_i2c_dev *i2c)
> +{
> + int status;
> + unsigned int val;
> + struct i2c_msg *msg = i2c->msg;
> +
> + dev_dbg(i2c->dev, "[%s,%d]msg->flags=0x%x, len=0x%x\n",
> + __func__, __LINE__, msg->flags, msg->len);
> +
> + hibvt_i2c_enable(i2c);
> + hibvt_i2c_clr_irq(i2c);
> + hibvt_i2c_set_addr(i2c);
> + hibvt_i2c_cfg_cmd(i2c);
> + hibvt_i2c_start_cmd(i2c);
> +
> + i2c->msg_buf_ptr = 0;
> +
> + if (msg->flags & I2C_M_RD) {
> + while (i2c->msg_buf_ptr < msg->len) {
> + status = hibvt_i2c_wait_rx_noempty(i2c);
> + if (status)
> + goto end;
> +
> + val = readl(i2c->base + HIBVT_I2C_RXF);
> + msg->buf[i2c->msg_buf_ptr] = val;
> + i2c->msg_buf_ptr++;
> +
> + }
> + } else {
> + while (i2c->msg_buf_ptr < msg->len) {
> + status = hibvt_i2c_wait_tx_nofull(i2c);
> + if (status)
> + goto end;
> +
> + val = msg->buf[i2c->msg_buf_ptr];
> + writel(val, i2c->base + HIBVT_I2C_TXF);
> + i2c->msg_buf_ptr++;
> + }
> + }
> +
> + status = hibvt_i2c_wait_idle(i2c);
> +end:
> + hibvt_i2c_disable(i2c);
> +
> + return status;
> +}
> +
> +static irqreturn_t hibvt_i2c_isr(int irq, void *dev_id)
> +{
> + struct hibvt_i2c_dev *i2c = dev_id;
> + unsigned int irq_status;
> + struct i2c_msg *msg = i2c->msg;
> +
> + spin_lock(&i2c->lock);
> +
> + irq_status = hibvt_i2c_clr_irq(i2c);
> + dev_dbg(i2c->dev, "%s RIS: 0x%x\n", __func__, irq_status);
> +
> + if (!irq_status) {
> + dev_dbg(i2c->dev, "no irq\n");
> + goto end;
> + }
> +
> + if (irq_status & INTR_ABORT_MASK) {
> + dev_err(i2c->dev, "irq handle abort, RIS: 0x%x\n",
> + irq_status);
> + i2c->status = -EIO;
> + hibvt_i2c_disable_irq(i2c, INTR_ALL_MASK);
> +
> + complete(&i2c->msg_complete);
> + goto end;
> + }
> +
> + if (msg->flags & I2C_M_RD) {
> + while ((readl(i2c->base + HIBVT_I2C_STAT) & STAT_RXF_NOE_MASK)
> + && (i2c->msg_buf_ptr < msg->len)) {
> + msg->buf[i2c->msg_buf_ptr] =
> + readl(i2c->base + HIBVT_I2C_RXF);
> + i2c->msg_buf_ptr++;
> + }
> + } else {
> + while ((readl(i2c->base + HIBVT_I2C_STAT) & STAT_TXF_NOF_MASK)
> + && (i2c->msg_buf_ptr < msg->len)) {
> + writel(msg->buf[i2c->msg_buf_ptr],
> + i2c->base + HIBVT_I2C_TXF);
> + i2c->msg_buf_ptr++;
> + }
> + }
> +
> + if (i2c->msg_buf_ptr >= msg->len)
> + hibvt_i2c_disable_irq(i2c, INTR_TX_MASK | INTR_RX_MASK);
> +
> + if (irq_status & INTR_CMD_DONE_MASK) {
> + dev_dbg(i2c->dev, "cmd done\n");
> + i2c->status = 0;
> + hibvt_i2c_disable_irq(i2c, INTR_ALL_MASK);
> +
> + complete(&i2c->msg_complete);
> + }
> +
> +end:
> + spin_unlock(&i2c->lock);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int hibvt_i2c_interrupt_xfer_one_msg(struct hibvt_i2c_dev *i2c)
> +{
> + int status;
> + struct i2c_msg *msg = i2c->msg;
> + unsigned long timeout;
> + unsigned long flags;
> +
> + dev_dbg(i2c->dev, "[%s,%d]msg->flags=0x%x, len=0x%x\n",
> + __func__, __LINE__, msg->flags, msg->len);
> +
> + reinit_completion(&i2c->msg_complete);
> + i2c->msg_buf_ptr = 0;
> + i2c->status = -EIO;
> +
> + spin_lock_irqsave(&i2c->lock, flags);
> + hibvt_i2c_enable(i2c);
> + hibvt_i2c_clr_irq(i2c);
> + if (msg->flags & I2C_M_RD)
> + hibvt_i2c_cfg_irq(i2c, INTR_USE_MASK & ~INTR_TX_MASK);
> + else
> + hibvt_i2c_cfg_irq(i2c, INTR_USE_MASK & ~INTR_RX_MASK);
> +
> + hibvt_i2c_set_addr(i2c);
> + hibvt_i2c_cfg_cmd(i2c);
> + hibvt_i2c_start_cmd(i2c);
> + spin_unlock_irqrestore(&i2c->lock, flags);
> +
> + timeout = wait_for_completion_timeout(&i2c->msg_complete,
> + I2C_IRQ_TIMEOUT);
> +
> + if (timeout == 0) {
> + hibvt_i2c_disable_irq(i2c, INTR_ALL_MASK);
> + status = -EIO;
> + dev_err(i2c->dev, "%s timeout\n",
> + msg->flags & I2C_M_RD ? "rx" : "tx");
> + } else {
> + status = i2c->status;
> + }
> +
> + hibvt_i2c_disable(i2c);
> +
> + return status;
> +}
> +
> +/*
> + * Master transfer function
> + */
> +static int hibvt_i2c_xfer(struct i2c_adapter *adap,
> + struct i2c_msg *msgs, int num)
> +{
> + struct hibvt_i2c_dev *i2c = i2c_get_adapdata(adap);
> + int status;
> +
> + if (!msgs) {
> + dev_err(i2c->dev, "msgs == NULL\n");
> + return -EIO;
> + }
> +
> + i2c->msg = msgs;
> + i2c->msg_num = num;
> + i2c->msg_idx = 0;
> +
> + if (i2c->irq >= 0) {
> + while (i2c->msg_idx < i2c->msg_num) {
> + status = hibvt_i2c_interrupt_xfer_one_msg(i2c);
> + if (status)
> + break;
> +
> + i2c->msg++;
> + i2c->msg_idx++;
> + }
> + } else {
> + while (i2c->msg_idx < i2c->msg_num) {
> + status = hibvt_i2c_polling_xfer_one_msg(i2c);
> + if (status)
> + break;
> +
> + i2c->msg++;
> + i2c->msg_idx++;
> + }
> + }
> +
> + if (!status || i2c->msg_idx > 0)
> + status = i2c->msg_idx;
> +
> + return status;
> +}
> +
> +static u32 hibvt_i2c_func(struct i2c_adapter *adap)
> +{
> + return I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR
> + | I2C_FUNC_PROTOCOL_MANGLING;
> +}
> +
> +static const struct i2c_algorithm hibvt_i2c_algo = {
> + .master_xfer = hibvt_i2c_xfer,
> + .functionality = hibvt_i2c_func,
> +};
> +
> +static int hibvt_i2c_probe(struct platform_device *pdev)
> +{
> + int status;
> + struct hibvt_i2c_dev *i2c;
> + struct i2c_adapter *adap;
> + struct resource *res;
> +
> + i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL);
> + if (!i2c)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, i2c);
> + i2c->dev = &pdev->dev;
> + spin_lock_init(&i2c->lock);
> + init_completion(&i2c->msg_complete);
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + i2c->base = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(i2c->base)) {
> + dev_err(i2c->dev, "cannot ioremap resource\n");
> + return -ENOMEM;
> + }
> +
> + i2c->clk = devm_clk_get(&pdev->dev, NULL);
> + if (IS_ERR(i2c->clk)) {
> + dev_err(i2c->dev, "cannot get clock\n");
> + return -ENOENT;
> + }
> + clk_prepare_enable(i2c->clk);
> +
> + if (of_property_read_u32(pdev->dev.of_node, "clock-frequency",
> + &i2c->freq)) {
> + dev_warn(i2c->dev, "setting default clock-frequency@...z\n",
> + I2C_DEFAULT_FREQUENCY);
> + i2c->freq = I2C_DEFAULT_FREQUENCY;
> + }
> +
> + /* i2c controller initialization, disable interrupt */
> + hibvt_i2c_hw_init(i2c);
> +
> + i2c->irq = platform_get_irq(pdev, 0);
> + status = devm_request_irq(&pdev->dev, i2c->irq, hibvt_i2c_isr,
> + IRQF_SHARED, dev_name(&pdev->dev), i2c);
> + if (status) {
> + dev_dbg(i2c->dev, "falling back to polling mode");
> + i2c->irq = -1;
> + }
> +
> + adap = &i2c->adap;
> + i2c_set_adapdata(adap, i2c);
> + adap->owner = THIS_MODULE;
> + strlcpy(adap->name, "hibvt-i2c", sizeof(adap->name));
> + adap->dev.parent = &pdev->dev;
> + adap->dev.of_node = pdev->dev.of_node;
> + adap->algo = &hibvt_i2c_algo;
> +
> + /* Add the i2c adapter */
> + status = i2c_add_adapter(adap);
> + if (status) {
> + dev_err(i2c->dev, "failed to add bus to i2c core\n");
> + goto err_add_adapter;
> + }
> +
> + dev_info(i2c->dev, "%s%d@...z registered\n",
> + adap->name, adap->nr, i2c->freq);
> +
> + return 0;
> +
> +err_add_adapter:
> + clk_disable_unprepare(i2c->clk);
> + return status;
> +}
> +
> +static int hibvt_i2c_remove(struct platform_device *pdev)
> +{
> + struct hibvt_i2c_dev *i2c = platform_get_drvdata(pdev);
> +
> + clk_disable_unprepare(i2c->clk);
> + i2c_del_adapter(&i2c->adap);
> +
> + return 0;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int hibvt_i2c_suspend(struct device *dev)
> +{
> + struct hibvt_i2c_dev *i2c = dev_get_drvdata(dev);
> +
> + i2c_lock_adapter(&i2c->adap);
> + clk_disable_unprepare(i2c->clk);
> + i2c_unlock_adapter(&i2c->adap);
> +
> + return 0;
> +}
> +
> +static int hibvt_i2c_resume(struct device *dev)
> +{
> + struct hibvt_i2c_dev *i2c = dev_get_drvdata(dev);
> +
> + i2c_lock_adapter(&i2c->adap);
> + clk_prepare_enable(i2c->clk);
> + hibvt_i2c_hw_init(i2c);
> + i2c_unlock_adapter(&i2c->adap);
> +
> + return 0;
> +}
> +#endif
> +
> +static SIMPLE_DEV_PM_OPS(hibvt_i2c_dev_pm, hibvt_i2c_suspend,
> + hibvt_i2c_resume);
> +
> +static const struct of_device_id hibvt_i2c_match[] = {
> + { .compatible = "hisilicon,hibvt-i2c"},
> + { .compatible = "hisilicon,hi3516cv300-i2c"},
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, hibvt_i2c_match);
> +
> +static struct platform_driver hibvt_i2c_driver = {
> + .driver = {
> + .name = "hibvt-i2c",
> + .of_match_table = hibvt_i2c_match,
> + .pm = &hibvt_i2c_dev_pm,
> + },
> + .probe = hibvt_i2c_probe,
> + .remove = hibvt_i2c_remove,
> +};
> +
> +module_platform_driver(hibvt_i2c_driver);
> +
> +MODULE_AUTHOR("Pan Wen, <wenpan@...ilicon.com>");
> +MODULE_DESCRIPTION("HISILICON BVT I2C Bus driver");
> +MODULE_LICENSE("GPL v2");
>
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