| /* |
| * Copyright (C) 2002 Motorola GSG-China |
| * |
| * 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, write to the Free Software |
| * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
| * USA. |
| * |
| * Author: |
| * Darius Augulis, Teltonika Inc. |
| * |
| * Desc.: |
| * Implementation of I2C Adapter/Algorithm Driver |
| * for I2C Bus integrated in Freescale i.MX/MXC processors |
| * |
| * Derived from Motorola GSG China I2C example driver |
| * |
| * Copyright (C) 2005 Torsten Koschorrek <koschorrek at synertronixx.de |
| * Copyright (C) 2005 Matthias Blaschke <blaschke at synertronixx.de |
| * Copyright (C) 2007 RightHand Technologies, Inc. |
| * Copyright (C) 2008 Darius Augulis <darius.augulis at teltonika.lt> |
| * |
| * Copyright 2013 Freescale Semiconductor, Inc. |
| * |
| */ |
| |
| /** Includes ******************************************************************* |
| *******************************************************************************/ |
| |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/errno.h> |
| #include <linux/err.h> |
| #include <linux/interrupt.h> |
| #include <linux/delay.h> |
| #include <linux/i2c.h> |
| #include <linux/io.h> |
| #include <linux/sched.h> |
| #include <linux/platform_device.h> |
| #include <linux/clk.h> |
| #include <linux/slab.h> |
| #include <linux/of.h> |
| #include <linux/of_device.h> |
| #include <linux/platform_data/i2c-imx.h> |
| |
| /** Defines ******************************************************************** |
| *******************************************************************************/ |
| |
| /* This will be the driver name the kernel reports */ |
| #define DRIVER_NAME "imx-i2c" |
| |
| /* Default value */ |
| #define IMX_I2C_BIT_RATE 100000 /* 100kHz */ |
| |
| /* IMX I2C registers: |
| * the I2C register offset is different between SoCs, |
| * to provid support for all these chips, split the |
| * register offset into a fixed base address and a |
| * variable shift value, then the full register offset |
| * will be calculated by |
| * reg_off = ( reg_base_addr << reg_shift) |
| */ |
| #define IMX_I2C_IADR 0x00 /* i2c slave address */ |
| #define IMX_I2C_IFDR 0x01 /* i2c frequency divider */ |
| #define IMX_I2C_I2CR 0x02 /* i2c control */ |
| #define IMX_I2C_I2SR 0x03 /* i2c status */ |
| #define IMX_I2C_I2DR 0x04 /* i2c transfer data */ |
| |
| #define IMX_I2C_REGSHIFT 2 |
| #define VF610_I2C_REGSHIFT 0 |
| |
| /* Bits of IMX I2C registers */ |
| #define I2SR_RXAK 0x01 |
| #define I2SR_IIF 0x02 |
| #define I2SR_SRW 0x04 |
| #define I2SR_IAL 0x10 |
| #define I2SR_IBB 0x20 |
| #define I2SR_IAAS 0x40 |
| #define I2SR_ICF 0x80 |
| #define I2CR_RSTA 0x04 |
| #define I2CR_TXAK 0x08 |
| #define I2CR_MTX 0x10 |
| #define I2CR_MSTA 0x20 |
| #define I2CR_IIEN 0x40 |
| #define I2CR_IEN 0x80 |
| |
| /* register bits different operating codes definition: |
| * 1) I2SR: Interrupt flags clear operation differ between SoCs: |
| * - write zero to clear(w0c) INT flag on i.MX, |
| * - but write one to clear(w1c) INT flag on Vybrid. |
| * 2) I2CR: I2C module enable operation also differ between SoCs: |
| * - set I2CR_IEN bit enable the module on i.MX, |
| * - but clear I2CR_IEN bit enable the module on Vybrid. |
| */ |
| #define I2SR_CLR_OPCODE_W0C 0x0 |
| #define I2SR_CLR_OPCODE_W1C (I2SR_IAL | I2SR_IIF) |
| #define I2CR_IEN_OPCODE_0 0x0 |
| #define I2CR_IEN_OPCODE_1 I2CR_IEN |
| |
| /** Variables ****************************************************************** |
| *******************************************************************************/ |
| |
| /* |
| * sorted list of clock divider, register value pairs |
| * taken from table 26-5, p.26-9, Freescale i.MX |
| * Integrated Portable System Processor Reference Manual |
| * Document Number: MC9328MXLRM, Rev. 5.1, 06/2007 |
| * |
| * Duplicated divider values removed from list |
| */ |
| struct imx_i2c_clk_pair { |
| u16 div; |
| u16 val; |
| }; |
| |
| static struct imx_i2c_clk_pair imx_i2c_clk_div[] = { |
| { 22, 0x20 }, { 24, 0x21 }, { 26, 0x22 }, { 28, 0x23 }, |
| { 30, 0x00 }, { 32, 0x24 }, { 36, 0x25 }, { 40, 0x26 }, |
| { 42, 0x03 }, { 44, 0x27 }, { 48, 0x28 }, { 52, 0x05 }, |
| { 56, 0x29 }, { 60, 0x06 }, { 64, 0x2A }, { 72, 0x2B }, |
| { 80, 0x2C }, { 88, 0x09 }, { 96, 0x2D }, { 104, 0x0A }, |
| { 112, 0x2E }, { 128, 0x2F }, { 144, 0x0C }, { 160, 0x30 }, |
| { 192, 0x31 }, { 224, 0x32 }, { 240, 0x0F }, { 256, 0x33 }, |
| { 288, 0x10 }, { 320, 0x34 }, { 384, 0x35 }, { 448, 0x36 }, |
| { 480, 0x13 }, { 512, 0x37 }, { 576, 0x14 }, { 640, 0x38 }, |
| { 768, 0x39 }, { 896, 0x3A }, { 960, 0x17 }, { 1024, 0x3B }, |
| { 1152, 0x18 }, { 1280, 0x3C }, { 1536, 0x3D }, { 1792, 0x3E }, |
| { 1920, 0x1B }, { 2048, 0x3F }, { 2304, 0x1C }, { 2560, 0x1D }, |
| { 3072, 0x1E }, { 3840, 0x1F } |
| }; |
| |
| /* Vybrid VF610 clock divider, register value pairs */ |
| static struct imx_i2c_clk_pair vf610_i2c_clk_div[] = { |
| { 20, 0x00 }, { 22, 0x01 }, { 24, 0x02 }, { 26, 0x03 }, |
| { 28, 0x04 }, { 30, 0x05 }, { 32, 0x09 }, { 34, 0x06 }, |
| { 36, 0x0A }, { 40, 0x07 }, { 44, 0x0C }, { 48, 0x0D }, |
| { 52, 0x43 }, { 56, 0x0E }, { 60, 0x45 }, { 64, 0x12 }, |
| { 68, 0x0F }, { 72, 0x13 }, { 80, 0x14 }, { 88, 0x15 }, |
| { 96, 0x19 }, { 104, 0x16 }, { 112, 0x1A }, { 128, 0x17 }, |
| { 136, 0x4F }, { 144, 0x1C }, { 160, 0x1D }, { 176, 0x55 }, |
| { 192, 0x1E }, { 208, 0x56 }, { 224, 0x22 }, { 228, 0x24 }, |
| { 240, 0x1F }, { 256, 0x23 }, { 288, 0x5C }, { 320, 0x25 }, |
| { 384, 0x26 }, { 448, 0x2A }, { 480, 0x27 }, { 512, 0x2B }, |
| { 576, 0x2C }, { 640, 0x2D }, { 768, 0x31 }, { 896, 0x32 }, |
| { 960, 0x2F }, { 1024, 0x33 }, { 1152, 0x34 }, { 1280, 0x35 }, |
| { 1536, 0x36 }, { 1792, 0x3A }, { 1920, 0x37 }, { 2048, 0x3B }, |
| { 2304, 0x3C }, { 2560, 0x3D }, { 3072, 0x3E }, { 3584, 0x7A }, |
| { 3840, 0x3F }, { 4096, 0x7B }, { 5120, 0x7D }, { 6144, 0x7E }, |
| }; |
| |
| enum imx_i2c_type { |
| IMX1_I2C, |
| IMX21_I2C, |
| VF610_I2C, |
| }; |
| |
| struct imx_i2c_hwdata { |
| enum imx_i2c_type devtype; |
| unsigned regshift; |
| struct imx_i2c_clk_pair *clk_div; |
| unsigned ndivs; |
| unsigned i2sr_clr_opcode; |
| unsigned i2cr_ien_opcode; |
| }; |
| |
| struct imx_i2c_struct { |
| struct i2c_adapter adapter; |
| struct clk *clk; |
| void __iomem *base; |
| wait_queue_head_t queue; |
| unsigned long i2csr; |
| unsigned int disable_delay; |
| int stopped; |
| unsigned int ifdr; /* IMX_I2C_IFDR */ |
| const struct imx_i2c_hwdata *hwdata; |
| }; |
| |
| static const struct imx_i2c_hwdata imx1_i2c_hwdata = { |
| .devtype = IMX1_I2C, |
| .regshift = IMX_I2C_REGSHIFT, |
| .clk_div = imx_i2c_clk_div, |
| .ndivs = ARRAY_SIZE(imx_i2c_clk_div), |
| .i2sr_clr_opcode = I2SR_CLR_OPCODE_W0C, |
| .i2cr_ien_opcode = I2CR_IEN_OPCODE_1, |
| |
| }; |
| |
| static const struct imx_i2c_hwdata imx21_i2c_hwdata = { |
| .devtype = IMX21_I2C, |
| .regshift = IMX_I2C_REGSHIFT, |
| .clk_div = imx_i2c_clk_div, |
| .ndivs = ARRAY_SIZE(imx_i2c_clk_div), |
| .i2sr_clr_opcode = I2SR_CLR_OPCODE_W0C, |
| .i2cr_ien_opcode = I2CR_IEN_OPCODE_1, |
| |
| }; |
| |
| static struct imx_i2c_hwdata vf610_i2c_hwdata = { |
| .devtype = VF610_I2C, |
| .regshift = VF610_I2C_REGSHIFT, |
| .clk_div = vf610_i2c_clk_div, |
| .ndivs = ARRAY_SIZE(vf610_i2c_clk_div), |
| .i2sr_clr_opcode = I2SR_CLR_OPCODE_W1C, |
| .i2cr_ien_opcode = I2CR_IEN_OPCODE_0, |
| |
| }; |
| |
| static struct platform_device_id imx_i2c_devtype[] = { |
| { |
| .name = "imx1-i2c", |
| .driver_data = (kernel_ulong_t)&imx1_i2c_hwdata, |
| }, { |
| .name = "imx21-i2c", |
| .driver_data = (kernel_ulong_t)&imx21_i2c_hwdata, |
| }, { |
| /* sentinel */ |
| } |
| }; |
| MODULE_DEVICE_TABLE(platform, imx_i2c_devtype); |
| |
| static const struct of_device_id i2c_imx_dt_ids[] = { |
| { .compatible = "fsl,imx1-i2c", .data = &imx1_i2c_hwdata, }, |
| { .compatible = "fsl,imx21-i2c", .data = &imx21_i2c_hwdata, }, |
| { .compatible = "fsl,vf610-i2c", .data = &vf610_i2c_hwdata, }, |
| { /* sentinel */ } |
| }; |
| MODULE_DEVICE_TABLE(of, i2c_imx_dt_ids); |
| |
| static inline int is_imx1_i2c(struct imx_i2c_struct *i2c_imx) |
| { |
| return i2c_imx->hwdata->devtype == IMX1_I2C; |
| } |
| |
| static inline void imx_i2c_write_reg(unsigned int val, |
| struct imx_i2c_struct *i2c_imx, unsigned int reg) |
| { |
| writeb(val, i2c_imx->base + (reg << i2c_imx->hwdata->regshift)); |
| } |
| |
| static inline unsigned char imx_i2c_read_reg(struct imx_i2c_struct *i2c_imx, |
| unsigned int reg) |
| { |
| return readb(i2c_imx->base + (reg << i2c_imx->hwdata->regshift)); |
| } |
| |
| /** Functions for IMX I2C adapter driver *************************************** |
| *******************************************************************************/ |
| |
| static int i2c_imx_bus_busy(struct imx_i2c_struct *i2c_imx, int for_busy) |
| { |
| unsigned long orig_jiffies = jiffies; |
| unsigned int temp; |
| |
| dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__); |
| |
| while (1) { |
| temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR); |
| if (for_busy && (temp & I2SR_IBB)) |
| break; |
| if (!for_busy && !(temp & I2SR_IBB)) |
| break; |
| if (time_after(jiffies, orig_jiffies + msecs_to_jiffies(500))) { |
| dev_dbg(&i2c_imx->adapter.dev, |
| "<%s> I2C bus is busy\n", __func__); |
| return -ETIMEDOUT; |
| } |
| schedule(); |
| } |
| |
| return 0; |
| } |
| |
| static int i2c_imx_trx_complete(struct imx_i2c_struct *i2c_imx) |
| { |
| wait_event_timeout(i2c_imx->queue, i2c_imx->i2csr & I2SR_IIF, HZ / 10); |
| |
| if (unlikely(!(i2c_imx->i2csr & I2SR_IIF))) { |
| dev_dbg(&i2c_imx->adapter.dev, "<%s> Timeout\n", __func__); |
| return -ETIMEDOUT; |
| } |
| dev_dbg(&i2c_imx->adapter.dev, "<%s> TRX complete\n", __func__); |
| i2c_imx->i2csr = 0; |
| return 0; |
| } |
| |
| static int i2c_imx_acked(struct imx_i2c_struct *i2c_imx) |
| { |
| if (imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR) & I2SR_RXAK) { |
| dev_dbg(&i2c_imx->adapter.dev, "<%s> No ACK\n", __func__); |
| return -EIO; /* No ACK */ |
| } |
| |
| dev_dbg(&i2c_imx->adapter.dev, "<%s> ACK received\n", __func__); |
| return 0; |
| } |
| |
| static int i2c_imx_start(struct imx_i2c_struct *i2c_imx) |
| { |
| unsigned int temp = 0; |
| int result; |
| |
| dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__); |
| |
| result = clk_prepare_enable(i2c_imx->clk); |
| if (result) |
| return result; |
| imx_i2c_write_reg(i2c_imx->ifdr, i2c_imx, IMX_I2C_IFDR); |
| /* Enable I2C controller */ |
| imx_i2c_write_reg(i2c_imx->hwdata->i2sr_clr_opcode, i2c_imx, IMX_I2C_I2SR); |
| imx_i2c_write_reg(i2c_imx->hwdata->i2cr_ien_opcode, i2c_imx, IMX_I2C_I2CR); |
| |
| /* Wait controller to be stable */ |
| udelay(50); |
| |
| /* Start I2C transaction */ |
| temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
| temp |= I2CR_MSTA; |
| imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
| result = i2c_imx_bus_busy(i2c_imx, 1); |
| if (result) |
| return result; |
| i2c_imx->stopped = 0; |
| |
| temp |= I2CR_IIEN | I2CR_MTX | I2CR_TXAK; |
| imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
| return result; |
| } |
| |
| static void i2c_imx_stop(struct imx_i2c_struct *i2c_imx) |
| { |
| unsigned int temp = 0; |
| |
| if (!i2c_imx->stopped) { |
| /* Stop I2C transaction */ |
| dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__); |
| temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
| temp &= ~(I2CR_MSTA | I2CR_MTX); |
| imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
| } |
| if (is_imx1_i2c(i2c_imx)) { |
| /* |
| * This delay caused by an i.MXL hardware bug. |
| * If no (or too short) delay, no "STOP" bit will be generated. |
| */ |
| udelay(i2c_imx->disable_delay); |
| } |
| |
| if (!i2c_imx->stopped) { |
| i2c_imx_bus_busy(i2c_imx, 0); |
| i2c_imx->stopped = 1; |
| } |
| |
| /* Disable I2C controller */ |
| temp = i2c_imx->hwdata->i2cr_ien_opcode ^ I2CR_IEN, |
| imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
| clk_disable_unprepare(i2c_imx->clk); |
| } |
| |
| static void i2c_imx_set_clk(struct imx_i2c_struct *i2c_imx, |
| unsigned int rate) |
| { |
| struct imx_i2c_clk_pair *i2c_clk_div = i2c_imx->hwdata->clk_div; |
| unsigned int i2c_clk_rate; |
| unsigned int div; |
| int i; |
| |
| /* Divider value calculation */ |
| i2c_clk_rate = clk_get_rate(i2c_imx->clk); |
| div = (i2c_clk_rate + rate - 1) / rate; |
| if (div < i2c_clk_div[0].div) |
| i = 0; |
| else if (div > i2c_clk_div[i2c_imx->hwdata->ndivs - 1].div) |
| i = i2c_imx->hwdata->ndivs - 1; |
| else |
| for (i = 0; i2c_clk_div[i].div < div; i++); |
| |
| /* Store divider value */ |
| i2c_imx->ifdr = i2c_clk_div[i].val; |
| |
| /* |
| * There dummy delay is calculated. |
| * It should be about one I2C clock period long. |
| * This delay is used in I2C bus disable function |
| * to fix chip hardware bug. |
| */ |
| i2c_imx->disable_delay = (500000U * i2c_clk_div[i].div |
| + (i2c_clk_rate / 2) - 1) / (i2c_clk_rate / 2); |
| |
| /* dev_dbg() can't be used, because adapter is not yet registered */ |
| #ifdef CONFIG_I2C_DEBUG_BUS |
| dev_dbg(&i2c_imx->adapter.dev, "<%s> I2C_CLK=%d, REQ DIV=%d\n", |
| __func__, i2c_clk_rate, div); |
| dev_dbg(&i2c_imx->adapter.dev, "<%s> IFDR[IC]=0x%x, REAL DIV=%d\n", |
| __func__, i2c_clk_div[i].val, i2c_clk_div[i].div); |
| #endif |
| } |
| |
| static irqreturn_t i2c_imx_isr(int irq, void *dev_id) |
| { |
| struct imx_i2c_struct *i2c_imx = dev_id; |
| unsigned int temp; |
| |
| temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR); |
| if (temp & I2SR_IIF) { |
| /* save status register */ |
| i2c_imx->i2csr = temp; |
| temp &= ~I2SR_IIF; |
| temp |= (i2c_imx->hwdata->i2sr_clr_opcode & I2SR_IIF); |
| imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2SR); |
| wake_up(&i2c_imx->queue); |
| return IRQ_HANDLED; |
| } |
| |
| return IRQ_NONE; |
| } |
| |
| static int i2c_imx_write(struct imx_i2c_struct *i2c_imx, struct i2c_msg *msgs) |
| { |
| int i, result; |
| |
| dev_dbg(&i2c_imx->adapter.dev, "<%s> write slave address: addr=0x%x\n", |
| __func__, msgs->addr << 1); |
| |
| /* write slave address */ |
| imx_i2c_write_reg(msgs->addr << 1, i2c_imx, IMX_I2C_I2DR); |
| result = i2c_imx_trx_complete(i2c_imx); |
| if (result) |
| return result; |
| result = i2c_imx_acked(i2c_imx); |
| if (result) |
| return result; |
| dev_dbg(&i2c_imx->adapter.dev, "<%s> write data\n", __func__); |
| |
| /* write data */ |
| for (i = 0; i < msgs->len; i++) { |
| dev_dbg(&i2c_imx->adapter.dev, |
| "<%s> write byte: B%d=0x%X\n", |
| __func__, i, msgs->buf[i]); |
| imx_i2c_write_reg(msgs->buf[i], i2c_imx, IMX_I2C_I2DR); |
| result = i2c_imx_trx_complete(i2c_imx); |
| if (result) |
| return result; |
| result = i2c_imx_acked(i2c_imx); |
| if (result) |
| return result; |
| } |
| return 0; |
| } |
| |
| static int i2c_imx_read(struct imx_i2c_struct *i2c_imx, struct i2c_msg *msgs) |
| { |
| int i, result; |
| unsigned int temp; |
| |
| dev_dbg(&i2c_imx->adapter.dev, |
| "<%s> write slave address: addr=0x%x\n", |
| __func__, (msgs->addr << 1) | 0x01); |
| |
| /* write slave address */ |
| imx_i2c_write_reg((msgs->addr << 1) | 0x01, i2c_imx, IMX_I2C_I2DR); |
| result = i2c_imx_trx_complete(i2c_imx); |
| if (result) |
| return result; |
| result = i2c_imx_acked(i2c_imx); |
| if (result) |
| return result; |
| |
| dev_dbg(&i2c_imx->adapter.dev, "<%s> setup bus\n", __func__); |
| |
| /* setup bus to read data */ |
| temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
| temp &= ~I2CR_MTX; |
| if (msgs->len - 1) |
| temp &= ~I2CR_TXAK; |
| imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
| imx_i2c_read_reg(i2c_imx, IMX_I2C_I2DR); /* dummy read */ |
| |
| dev_dbg(&i2c_imx->adapter.dev, "<%s> read data\n", __func__); |
| |
| /* read data */ |
| for (i = 0; i < msgs->len; i++) { |
| result = i2c_imx_trx_complete(i2c_imx); |
| if (result) |
| return result; |
| if (i == (msgs->len - 1)) { |
| /* It must generate STOP before read I2DR to prevent |
| controller from generating another clock cycle */ |
| dev_dbg(&i2c_imx->adapter.dev, |
| "<%s> clear MSTA\n", __func__); |
| temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
| temp &= ~(I2CR_MSTA | I2CR_MTX); |
| imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
| i2c_imx_bus_busy(i2c_imx, 0); |
| i2c_imx->stopped = 1; |
| } else if (i == (msgs->len - 2)) { |
| dev_dbg(&i2c_imx->adapter.dev, |
| "<%s> set TXAK\n", __func__); |
| temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
| temp |= I2CR_TXAK; |
| imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
| } |
| msgs->buf[i] = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2DR); |
| dev_dbg(&i2c_imx->adapter.dev, |
| "<%s> read byte: B%d=0x%X\n", |
| __func__, i, msgs->buf[i]); |
| } |
| return 0; |
| } |
| |
| static int i2c_imx_xfer(struct i2c_adapter *adapter, |
| struct i2c_msg *msgs, int num) |
| { |
| unsigned int i, temp; |
| int result; |
| struct imx_i2c_struct *i2c_imx = i2c_get_adapdata(adapter); |
| |
| dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__); |
| |
| /* Start I2C transfer */ |
| result = i2c_imx_start(i2c_imx); |
| if (result) |
| goto fail0; |
| |
| /* read/write data */ |
| for (i = 0; i < num; i++) { |
| if (i) { |
| dev_dbg(&i2c_imx->adapter.dev, |
| "<%s> repeated start\n", __func__); |
| temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
| temp |= I2CR_RSTA; |
| imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
| result = i2c_imx_bus_busy(i2c_imx, 1); |
| if (result) |
| goto fail0; |
| } |
| dev_dbg(&i2c_imx->adapter.dev, |
| "<%s> transfer message: %d\n", __func__, i); |
| /* write/read data */ |
| #ifdef CONFIG_I2C_DEBUG_BUS |
| temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
| dev_dbg(&i2c_imx->adapter.dev, "<%s> CONTROL: IEN=%d, IIEN=%d, " |
| "MSTA=%d, MTX=%d, TXAK=%d, RSTA=%d\n", __func__, |
| (temp & I2CR_IEN ? 1 : 0), (temp & I2CR_IIEN ? 1 : 0), |
| (temp & I2CR_MSTA ? 1 : 0), (temp & I2CR_MTX ? 1 : 0), |
| (temp & I2CR_TXAK ? 1 : 0), (temp & I2CR_RSTA ? 1 : 0)); |
| temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR); |
| dev_dbg(&i2c_imx->adapter.dev, |
| "<%s> STATUS: ICF=%d, IAAS=%d, IBB=%d, " |
| "IAL=%d, SRW=%d, IIF=%d, RXAK=%d\n", __func__, |
| (temp & I2SR_ICF ? 1 : 0), (temp & I2SR_IAAS ? 1 : 0), |
| (temp & I2SR_IBB ? 1 : 0), (temp & I2SR_IAL ? 1 : 0), |
| (temp & I2SR_SRW ? 1 : 0), (temp & I2SR_IIF ? 1 : 0), |
| (temp & I2SR_RXAK ? 1 : 0)); |
| #endif |
| if (msgs[i].flags & I2C_M_RD) |
| result = i2c_imx_read(i2c_imx, &msgs[i]); |
| else |
| result = i2c_imx_write(i2c_imx, &msgs[i]); |
| if (result) |
| goto fail0; |
| } |
| |
| fail0: |
| /* Stop I2C transfer */ |
| i2c_imx_stop(i2c_imx); |
| |
| dev_dbg(&i2c_imx->adapter.dev, "<%s> exit with: %s: %d\n", __func__, |
| (result < 0) ? "error" : "success msg", |
| (result < 0) ? result : num); |
| return (result < 0) ? result : num; |
| } |
| |
| static u32 i2c_imx_func(struct i2c_adapter *adapter) |
| { |
| return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; |
| } |
| |
| static struct i2c_algorithm i2c_imx_algo = { |
| .master_xfer = i2c_imx_xfer, |
| .functionality = i2c_imx_func, |
| }; |
| |
| static int i2c_imx_probe(struct platform_device *pdev) |
| { |
| const struct of_device_id *of_id = of_match_device(i2c_imx_dt_ids, |
| &pdev->dev); |
| struct imx_i2c_struct *i2c_imx; |
| struct resource *res; |
| struct imxi2c_platform_data *pdata = dev_get_platdata(&pdev->dev); |
| void __iomem *base; |
| int irq, ret; |
| u32 bitrate; |
| |
| dev_dbg(&pdev->dev, "<%s>\n", __func__); |
| |
| irq = platform_get_irq(pdev, 0); |
| if (irq < 0) { |
| dev_err(&pdev->dev, "can't get irq number\n"); |
| return -ENOENT; |
| } |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| base = devm_ioremap_resource(&pdev->dev, res); |
| if (IS_ERR(base)) |
| return PTR_ERR(base); |
| |
| i2c_imx = devm_kzalloc(&pdev->dev, sizeof(struct imx_i2c_struct), |
| GFP_KERNEL); |
| if (!i2c_imx) { |
| dev_err(&pdev->dev, "can't allocate interface\n"); |
| return -ENOMEM; |
| } |
| |
| if (of_id) |
| i2c_imx->hwdata = of_id->data; |
| else |
| i2c_imx->hwdata = (struct imx_i2c_hwdata *) |
| platform_get_device_id(pdev)->driver_data; |
| |
| /* Setup i2c_imx driver structure */ |
| strlcpy(i2c_imx->adapter.name, pdev->name, sizeof(i2c_imx->adapter.name)); |
| i2c_imx->adapter.owner = THIS_MODULE; |
| i2c_imx->adapter.algo = &i2c_imx_algo; |
| i2c_imx->adapter.dev.parent = &pdev->dev; |
| i2c_imx->adapter.nr = pdev->id; |
| i2c_imx->adapter.dev.of_node = pdev->dev.of_node; |
| i2c_imx->base = base; |
| |
| /* Get I2C clock */ |
| i2c_imx->clk = devm_clk_get(&pdev->dev, NULL); |
| if (IS_ERR(i2c_imx->clk)) { |
| dev_err(&pdev->dev, "can't get I2C clock\n"); |
| return PTR_ERR(i2c_imx->clk); |
| } |
| |
| ret = clk_prepare_enable(i2c_imx->clk); |
| if (ret) { |
| dev_err(&pdev->dev, "can't enable I2C clock\n"); |
| return ret; |
| } |
| /* Request IRQ */ |
| ret = devm_request_irq(&pdev->dev, irq, i2c_imx_isr, 0, |
| pdev->name, i2c_imx); |
| if (ret) { |
| dev_err(&pdev->dev, "can't claim irq %d\n", irq); |
| return ret; |
| } |
| |
| /* Init queue */ |
| init_waitqueue_head(&i2c_imx->queue); |
| |
| /* Set up adapter data */ |
| i2c_set_adapdata(&i2c_imx->adapter, i2c_imx); |
| |
| /* Set up clock divider */ |
| bitrate = IMX_I2C_BIT_RATE; |
| ret = of_property_read_u32(pdev->dev.of_node, |
| "clock-frequency", &bitrate); |
| if (ret < 0 && pdata && pdata->bitrate) |
| bitrate = pdata->bitrate; |
| i2c_imx_set_clk(i2c_imx, bitrate); |
| |
| /* Set up chip registers to defaults */ |
| imx_i2c_write_reg(i2c_imx->hwdata->i2cr_ien_opcode ^ I2CR_IEN, |
| i2c_imx, IMX_I2C_I2CR); |
| imx_i2c_write_reg(i2c_imx->hwdata->i2sr_clr_opcode, i2c_imx, IMX_I2C_I2SR); |
| |
| /* Add I2C adapter */ |
| ret = i2c_add_numbered_adapter(&i2c_imx->adapter); |
| if (ret < 0) { |
| dev_err(&pdev->dev, "registration failed\n"); |
| return ret; |
| } |
| |
| /* Set up platform driver data */ |
| platform_set_drvdata(pdev, i2c_imx); |
| clk_disable_unprepare(i2c_imx->clk); |
| |
| dev_dbg(&i2c_imx->adapter.dev, "claimed irq %d\n", irq); |
| dev_dbg(&i2c_imx->adapter.dev, "device resources from 0x%x to 0x%x\n", |
| res->start, res->end); |
| dev_dbg(&i2c_imx->adapter.dev, "allocated %d bytes at 0x%x\n", |
| resource_size(res), res->start); |
| dev_dbg(&i2c_imx->adapter.dev, "adapter name: \"%s\"\n", |
| i2c_imx->adapter.name); |
| dev_info(&i2c_imx->adapter.dev, "IMX I2C adapter registered\n"); |
| |
| return 0; /* Return OK */ |
| } |
| |
| static int i2c_imx_remove(struct platform_device *pdev) |
| { |
| struct imx_i2c_struct *i2c_imx = platform_get_drvdata(pdev); |
| |
| /* remove adapter */ |
| dev_dbg(&i2c_imx->adapter.dev, "adapter removed\n"); |
| i2c_del_adapter(&i2c_imx->adapter); |
| |
| /* setup chip registers to defaults */ |
| imx_i2c_write_reg(0, i2c_imx, IMX_I2C_IADR); |
| imx_i2c_write_reg(0, i2c_imx, IMX_I2C_IFDR); |
| imx_i2c_write_reg(0, i2c_imx, IMX_I2C_I2CR); |
| imx_i2c_write_reg(0, i2c_imx, IMX_I2C_I2SR); |
| |
| return 0; |
| } |
| |
| static struct platform_driver i2c_imx_driver = { |
| .probe = i2c_imx_probe, |
| .remove = i2c_imx_remove, |
| .driver = { |
| .name = DRIVER_NAME, |
| .owner = THIS_MODULE, |
| .of_match_table = i2c_imx_dt_ids, |
| }, |
| .id_table = imx_i2c_devtype, |
| }; |
| |
| static int __init i2c_adap_imx_init(void) |
| { |
| return platform_driver_register(&i2c_imx_driver); |
| } |
| subsys_initcall(i2c_adap_imx_init); |
| |
| static void __exit i2c_adap_imx_exit(void) |
| { |
| platform_driver_unregister(&i2c_imx_driver); |
| } |
| module_exit(i2c_adap_imx_exit); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Darius Augulis"); |
| MODULE_DESCRIPTION("I2C adapter driver for IMX I2C bus"); |
| MODULE_ALIAS("platform:" DRIVER_NAME); |