Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2002 Motorola GSG-China |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version 2 |
| 7 | * of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
| 17 | * USA. |
| 18 | * |
| 19 | * Author: |
| 20 | * Darius Augulis, Teltonika Inc. |
| 21 | * |
| 22 | * Desc.: |
| 23 | * Implementation of I2C Adapter/Algorithm Driver |
| 24 | * for I2C Bus integrated in Freescale i.MX/MXC processors |
| 25 | * |
| 26 | * Derived from Motorola GSG China I2C example driver |
| 27 | * |
| 28 | * Copyright (C) 2005 Torsten Koschorrek <koschorrek at synertronixx.de |
| 29 | * Copyright (C) 2005 Matthias Blaschke <blaschke at synertronixx.de |
| 30 | * Copyright (C) 2007 RightHand Technologies, Inc. |
| 31 | * Copyright (C) 2008 Darius Augulis <darius.augulis at teltonika.lt> |
| 32 | * |
Jingchang Lu | d533f04 | 2013-08-07 17:05:36 +0800 | [diff] [blame] | 33 | * Copyright 2013 Freescale Semiconductor, Inc. |
| 34 | * |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 35 | */ |
| 36 | |
| 37 | /** Includes ******************************************************************* |
| 38 | *******************************************************************************/ |
| 39 | |
| 40 | #include <linux/init.h> |
| 41 | #include <linux/kernel.h> |
| 42 | #include <linux/module.h> |
| 43 | #include <linux/errno.h> |
| 44 | #include <linux/err.h> |
| 45 | #include <linux/interrupt.h> |
| 46 | #include <linux/delay.h> |
| 47 | #include <linux/i2c.h> |
| 48 | #include <linux/io.h> |
| 49 | #include <linux/sched.h> |
| 50 | #include <linux/platform_device.h> |
| 51 | #include <linux/clk.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 52 | #include <linux/slab.h> |
Shawn Guo | dfcd04b | 2011-09-08 15:09:35 +0800 | [diff] [blame] | 53 | #include <linux/of.h> |
| 54 | #include <linux/of_device.h> |
Arnd Bergmann | 82906b1 | 2012-08-24 15:14:29 +0200 | [diff] [blame] | 55 | #include <linux/platform_data/i2c-imx.h> |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 56 | |
| 57 | /** Defines ******************************************************************** |
| 58 | *******************************************************************************/ |
| 59 | |
| 60 | /* This will be the driver name the kernel reports */ |
| 61 | #define DRIVER_NAME "imx-i2c" |
| 62 | |
| 63 | /* Default value */ |
| 64 | #define IMX_I2C_BIT_RATE 100000 /* 100kHz */ |
| 65 | |
Jingchang Lu | 8cc7331 | 2013-08-07 17:05:40 +0800 | [diff] [blame] | 66 | /* IMX I2C registers: |
| 67 | * the I2C register offset is different between SoCs, |
| 68 | * to provid support for all these chips, split the |
| 69 | * register offset into a fixed base address and a |
| 70 | * variable shift value, then the full register offset |
| 71 | * will be calculated by |
| 72 | * reg_off = ( reg_base_addr << reg_shift) |
| 73 | */ |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 74 | #define IMX_I2C_IADR 0x00 /* i2c slave address */ |
Jingchang Lu | 8cc7331 | 2013-08-07 17:05:40 +0800 | [diff] [blame] | 75 | #define IMX_I2C_IFDR 0x01 /* i2c frequency divider */ |
| 76 | #define IMX_I2C_I2CR 0x02 /* i2c control */ |
| 77 | #define IMX_I2C_I2SR 0x03 /* i2c status */ |
| 78 | #define IMX_I2C_I2DR 0x04 /* i2c transfer data */ |
| 79 | |
| 80 | #define IMX_I2C_REGSHIFT 2 |
Jingchang Lu | ad90efa | 2013-08-07 17:05:43 +0800 | [diff] [blame] | 81 | #define VF610_I2C_REGSHIFT 0 |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 82 | |
| 83 | /* Bits of IMX I2C registers */ |
| 84 | #define I2SR_RXAK 0x01 |
| 85 | #define I2SR_IIF 0x02 |
| 86 | #define I2SR_SRW 0x04 |
| 87 | #define I2SR_IAL 0x10 |
| 88 | #define I2SR_IBB 0x20 |
| 89 | #define I2SR_IAAS 0x40 |
| 90 | #define I2SR_ICF 0x80 |
| 91 | #define I2CR_RSTA 0x04 |
| 92 | #define I2CR_TXAK 0x08 |
| 93 | #define I2CR_MTX 0x10 |
| 94 | #define I2CR_MSTA 0x20 |
| 95 | #define I2CR_IIEN 0x40 |
| 96 | #define I2CR_IEN 0x80 |
| 97 | |
Jingchang Lu | 171408c | 2013-08-07 17:05:41 +0800 | [diff] [blame] | 98 | /* register bits different operating codes definition: |
| 99 | * 1) I2SR: Interrupt flags clear operation differ between SoCs: |
| 100 | * - write zero to clear(w0c) INT flag on i.MX, |
| 101 | * - but write one to clear(w1c) INT flag on Vybrid. |
| 102 | * 2) I2CR: I2C module enable operation also differ between SoCs: |
| 103 | * - set I2CR_IEN bit enable the module on i.MX, |
| 104 | * - but clear I2CR_IEN bit enable the module on Vybrid. |
| 105 | */ |
| 106 | #define I2SR_CLR_OPCODE_W0C 0x0 |
| 107 | #define I2SR_CLR_OPCODE_W1C (I2SR_IAL | I2SR_IIF) |
| 108 | #define I2CR_IEN_OPCODE_0 0x0 |
| 109 | #define I2CR_IEN_OPCODE_1 I2CR_IEN |
| 110 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 111 | /** Variables ****************************************************************** |
| 112 | *******************************************************************************/ |
| 113 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 114 | /* |
| 115 | * sorted list of clock divider, register value pairs |
| 116 | * taken from table 26-5, p.26-9, Freescale i.MX |
| 117 | * Integrated Portable System Processor Reference Manual |
| 118 | * Document Number: MC9328MXLRM, Rev. 5.1, 06/2007 |
| 119 | * |
| 120 | * Duplicated divider values removed from list |
| 121 | */ |
Jingchang Lu | d533f04 | 2013-08-07 17:05:36 +0800 | [diff] [blame] | 122 | struct imx_i2c_clk_pair { |
| 123 | u16 div; |
| 124 | u16 val; |
| 125 | }; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 126 | |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 127 | static struct imx_i2c_clk_pair imx_i2c_clk_div[] = { |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 128 | { 22, 0x20 }, { 24, 0x21 }, { 26, 0x22 }, { 28, 0x23 }, |
| 129 | { 30, 0x00 }, { 32, 0x24 }, { 36, 0x25 }, { 40, 0x26 }, |
| 130 | { 42, 0x03 }, { 44, 0x27 }, { 48, 0x28 }, { 52, 0x05 }, |
| 131 | { 56, 0x29 }, { 60, 0x06 }, { 64, 0x2A }, { 72, 0x2B }, |
| 132 | { 80, 0x2C }, { 88, 0x09 }, { 96, 0x2D }, { 104, 0x0A }, |
| 133 | { 112, 0x2E }, { 128, 0x2F }, { 144, 0x0C }, { 160, 0x30 }, |
| 134 | { 192, 0x31 }, { 224, 0x32 }, { 240, 0x0F }, { 256, 0x33 }, |
| 135 | { 288, 0x10 }, { 320, 0x34 }, { 384, 0x35 }, { 448, 0x36 }, |
| 136 | { 480, 0x13 }, { 512, 0x37 }, { 576, 0x14 }, { 640, 0x38 }, |
| 137 | { 768, 0x39 }, { 896, 0x3A }, { 960, 0x17 }, { 1024, 0x3B }, |
| 138 | { 1152, 0x18 }, { 1280, 0x3C }, { 1536, 0x3D }, { 1792, 0x3E }, |
| 139 | { 1920, 0x1B }, { 2048, 0x3F }, { 2304, 0x1C }, { 2560, 0x1D }, |
| 140 | { 3072, 0x1E }, { 3840, 0x1F } |
| 141 | }; |
| 142 | |
Jingchang Lu | ad90efa | 2013-08-07 17:05:43 +0800 | [diff] [blame] | 143 | /* Vybrid VF610 clock divider, register value pairs */ |
| 144 | static struct imx_i2c_clk_pair vf610_i2c_clk_div[] = { |
| 145 | { 20, 0x00 }, { 22, 0x01 }, { 24, 0x02 }, { 26, 0x03 }, |
| 146 | { 28, 0x04 }, { 30, 0x05 }, { 32, 0x09 }, { 34, 0x06 }, |
| 147 | { 36, 0x0A }, { 40, 0x07 }, { 44, 0x0C }, { 48, 0x0D }, |
| 148 | { 52, 0x43 }, { 56, 0x0E }, { 60, 0x45 }, { 64, 0x12 }, |
| 149 | { 68, 0x0F }, { 72, 0x13 }, { 80, 0x14 }, { 88, 0x15 }, |
| 150 | { 96, 0x19 }, { 104, 0x16 }, { 112, 0x1A }, { 128, 0x17 }, |
| 151 | { 136, 0x4F }, { 144, 0x1C }, { 160, 0x1D }, { 176, 0x55 }, |
| 152 | { 192, 0x1E }, { 208, 0x56 }, { 224, 0x22 }, { 228, 0x24 }, |
| 153 | { 240, 0x1F }, { 256, 0x23 }, { 288, 0x5C }, { 320, 0x25 }, |
| 154 | { 384, 0x26 }, { 448, 0x2A }, { 480, 0x27 }, { 512, 0x2B }, |
| 155 | { 576, 0x2C }, { 640, 0x2D }, { 768, 0x31 }, { 896, 0x32 }, |
| 156 | { 960, 0x2F }, { 1024, 0x33 }, { 1152, 0x34 }, { 1280, 0x35 }, |
| 157 | { 1536, 0x36 }, { 1792, 0x3A }, { 1920, 0x37 }, { 2048, 0x3B }, |
| 158 | { 2304, 0x3C }, { 2560, 0x3D }, { 3072, 0x3E }, { 3584, 0x7A }, |
| 159 | { 3840, 0x3F }, { 4096, 0x7B }, { 5120, 0x7D }, { 6144, 0x7E }, |
| 160 | }; |
| 161 | |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 162 | enum imx_i2c_type { |
| 163 | IMX1_I2C, |
| 164 | IMX21_I2C, |
Jingchang Lu | ad90efa | 2013-08-07 17:05:43 +0800 | [diff] [blame] | 165 | VF610_I2C, |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 166 | }; |
| 167 | |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 168 | struct imx_i2c_hwdata { |
| 169 | enum imx_i2c_type devtype; |
| 170 | unsigned regshift; |
| 171 | struct imx_i2c_clk_pair *clk_div; |
| 172 | unsigned ndivs; |
| 173 | unsigned i2sr_clr_opcode; |
| 174 | unsigned i2cr_ien_opcode; |
| 175 | }; |
| 176 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 177 | struct imx_i2c_struct { |
| 178 | struct i2c_adapter adapter; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 179 | struct clk *clk; |
| 180 | void __iomem *base; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 181 | wait_queue_head_t queue; |
| 182 | unsigned long i2csr; |
Wolfram Sang | 65de394 | 2009-04-06 16:27:45 +0200 | [diff] [blame] | 183 | unsigned int disable_delay; |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 184 | int stopped; |
Richard Zhao | db3a3d4 | 2009-10-17 17:46:24 +0800 | [diff] [blame] | 185 | unsigned int ifdr; /* IMX_I2C_IFDR */ |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 186 | const struct imx_i2c_hwdata *hwdata; |
| 187 | }; |
| 188 | |
| 189 | static const struct imx_i2c_hwdata imx1_i2c_hwdata = { |
| 190 | .devtype = IMX1_I2C, |
| 191 | .regshift = IMX_I2C_REGSHIFT, |
| 192 | .clk_div = imx_i2c_clk_div, |
| 193 | .ndivs = ARRAY_SIZE(imx_i2c_clk_div), |
| 194 | .i2sr_clr_opcode = I2SR_CLR_OPCODE_W0C, |
| 195 | .i2cr_ien_opcode = I2CR_IEN_OPCODE_1, |
| 196 | |
| 197 | }; |
| 198 | |
| 199 | static const struct imx_i2c_hwdata imx21_i2c_hwdata = { |
| 200 | .devtype = IMX21_I2C, |
| 201 | .regshift = IMX_I2C_REGSHIFT, |
| 202 | .clk_div = imx_i2c_clk_div, |
| 203 | .ndivs = ARRAY_SIZE(imx_i2c_clk_div), |
| 204 | .i2sr_clr_opcode = I2SR_CLR_OPCODE_W0C, |
| 205 | .i2cr_ien_opcode = I2CR_IEN_OPCODE_1, |
| 206 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 207 | }; |
| 208 | |
Jingchang Lu | ad90efa | 2013-08-07 17:05:43 +0800 | [diff] [blame] | 209 | static struct imx_i2c_hwdata vf610_i2c_hwdata = { |
| 210 | .devtype = VF610_I2C, |
| 211 | .regshift = VF610_I2C_REGSHIFT, |
| 212 | .clk_div = vf610_i2c_clk_div, |
| 213 | .ndivs = ARRAY_SIZE(vf610_i2c_clk_div), |
| 214 | .i2sr_clr_opcode = I2SR_CLR_OPCODE_W1C, |
| 215 | .i2cr_ien_opcode = I2CR_IEN_OPCODE_0, |
| 216 | |
| 217 | }; |
| 218 | |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 219 | static struct platform_device_id imx_i2c_devtype[] = { |
| 220 | { |
| 221 | .name = "imx1-i2c", |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 222 | .driver_data = (kernel_ulong_t)&imx1_i2c_hwdata, |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 223 | }, { |
| 224 | .name = "imx21-i2c", |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 225 | .driver_data = (kernel_ulong_t)&imx21_i2c_hwdata, |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 226 | }, { |
| 227 | /* sentinel */ |
| 228 | } |
| 229 | }; |
| 230 | MODULE_DEVICE_TABLE(platform, imx_i2c_devtype); |
| 231 | |
Shawn Guo | dfcd04b | 2011-09-08 15:09:35 +0800 | [diff] [blame] | 232 | static const struct of_device_id i2c_imx_dt_ids[] = { |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 233 | { .compatible = "fsl,imx1-i2c", .data = &imx1_i2c_hwdata, }, |
| 234 | { .compatible = "fsl,imx21-i2c", .data = &imx21_i2c_hwdata, }, |
Jingchang Lu | ad90efa | 2013-08-07 17:05:43 +0800 | [diff] [blame] | 235 | { .compatible = "fsl,vf610-i2c", .data = &vf610_i2c_hwdata, }, |
Shawn Guo | dfcd04b | 2011-09-08 15:09:35 +0800 | [diff] [blame] | 236 | { /* sentinel */ } |
| 237 | }; |
Arnaud Patard \(Rtp\) | 2f641a8 | 2013-06-20 23:07:06 +0200 | [diff] [blame] | 238 | MODULE_DEVICE_TABLE(of, i2c_imx_dt_ids); |
Shawn Guo | dfcd04b | 2011-09-08 15:09:35 +0800 | [diff] [blame] | 239 | |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 240 | static inline int is_imx1_i2c(struct imx_i2c_struct *i2c_imx) |
| 241 | { |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 242 | return i2c_imx->hwdata->devtype == IMX1_I2C; |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 243 | } |
| 244 | |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 245 | static inline void imx_i2c_write_reg(unsigned int val, |
| 246 | struct imx_i2c_struct *i2c_imx, unsigned int reg) |
| 247 | { |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 248 | writeb(val, i2c_imx->base + (reg << i2c_imx->hwdata->regshift)); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 249 | } |
| 250 | |
| 251 | static inline unsigned char imx_i2c_read_reg(struct imx_i2c_struct *i2c_imx, |
| 252 | unsigned int reg) |
| 253 | { |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 254 | return readb(i2c_imx->base + (reg << i2c_imx->hwdata->regshift)); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 255 | } |
| 256 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 257 | /** Functions for IMX I2C adapter driver *************************************** |
| 258 | *******************************************************************************/ |
| 259 | |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 260 | static int i2c_imx_bus_busy(struct imx_i2c_struct *i2c_imx, int for_busy) |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 261 | { |
| 262 | unsigned long orig_jiffies = jiffies; |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 263 | unsigned int temp; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 264 | |
| 265 | dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__); |
| 266 | |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 267 | while (1) { |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 268 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR); |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 269 | if (for_busy && (temp & I2SR_IBB)) |
| 270 | break; |
| 271 | if (!for_busy && !(temp & I2SR_IBB)) |
| 272 | break; |
Arnaud Patard | da9c99f | 2010-03-23 17:28:28 +0100 | [diff] [blame] | 273 | if (time_after(jiffies, orig_jiffies + msecs_to_jiffies(500))) { |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 274 | dev_dbg(&i2c_imx->adapter.dev, |
| 275 | "<%s> I2C bus is busy\n", __func__); |
Arnaud Patard | da9c99f | 2010-03-23 17:28:28 +0100 | [diff] [blame] | 276 | return -ETIMEDOUT; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 277 | } |
| 278 | schedule(); |
| 279 | } |
| 280 | |
| 281 | return 0; |
| 282 | } |
| 283 | |
| 284 | static int i2c_imx_trx_complete(struct imx_i2c_struct *i2c_imx) |
| 285 | { |
Marc Kleine-Budde | e39428d | 2010-06-21 09:27:05 +0200 | [diff] [blame] | 286 | wait_event_timeout(i2c_imx->queue, i2c_imx->i2csr & I2SR_IIF, HZ / 10); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 287 | |
Marc Kleine-Budde | e39428d | 2010-06-21 09:27:05 +0200 | [diff] [blame] | 288 | if (unlikely(!(i2c_imx->i2csr & I2SR_IIF))) { |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 289 | dev_dbg(&i2c_imx->adapter.dev, "<%s> Timeout\n", __func__); |
| 290 | return -ETIMEDOUT; |
| 291 | } |
| 292 | dev_dbg(&i2c_imx->adapter.dev, "<%s> TRX complete\n", __func__); |
| 293 | i2c_imx->i2csr = 0; |
| 294 | return 0; |
| 295 | } |
| 296 | |
| 297 | static int i2c_imx_acked(struct imx_i2c_struct *i2c_imx) |
| 298 | { |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 299 | if (imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR) & I2SR_RXAK) { |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 300 | dev_dbg(&i2c_imx->adapter.dev, "<%s> No ACK\n", __func__); |
| 301 | return -EIO; /* No ACK */ |
| 302 | } |
| 303 | |
| 304 | dev_dbg(&i2c_imx->adapter.dev, "<%s> ACK received\n", __func__); |
| 305 | return 0; |
| 306 | } |
| 307 | |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 308 | static int i2c_imx_start(struct imx_i2c_struct *i2c_imx) |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 309 | { |
| 310 | unsigned int temp = 0; |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 311 | int result; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 312 | |
| 313 | dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__); |
| 314 | |
Fabio Estevam | e5bf216 | 2013-12-04 20:21:37 -0200 | [diff] [blame] | 315 | result = clk_prepare_enable(i2c_imx->clk); |
| 316 | if (result) |
| 317 | return result; |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 318 | imx_i2c_write_reg(i2c_imx->ifdr, i2c_imx, IMX_I2C_IFDR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 319 | /* Enable I2C controller */ |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 320 | imx_i2c_write_reg(i2c_imx->hwdata->i2sr_clr_opcode, i2c_imx, IMX_I2C_I2SR); |
| 321 | imx_i2c_write_reg(i2c_imx->hwdata->i2cr_ien_opcode, i2c_imx, IMX_I2C_I2CR); |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 322 | |
| 323 | /* Wait controller to be stable */ |
| 324 | udelay(50); |
| 325 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 326 | /* Start I2C transaction */ |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 327 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 328 | temp |= I2CR_MSTA; |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 329 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 330 | result = i2c_imx_bus_busy(i2c_imx, 1); |
| 331 | if (result) |
| 332 | return result; |
| 333 | i2c_imx->stopped = 0; |
| 334 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 335 | temp |= I2CR_IIEN | I2CR_MTX | I2CR_TXAK; |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 336 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 337 | return result; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 338 | } |
| 339 | |
| 340 | static void i2c_imx_stop(struct imx_i2c_struct *i2c_imx) |
| 341 | { |
| 342 | unsigned int temp = 0; |
| 343 | |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 344 | if (!i2c_imx->stopped) { |
| 345 | /* Stop I2C transaction */ |
| 346 | dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 347 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 348 | temp &= ~(I2CR_MSTA | I2CR_MTX); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 349 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 350 | } |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 351 | if (is_imx1_i2c(i2c_imx)) { |
Richard Zhao | a4094a7 | 2009-10-17 17:46:23 +0800 | [diff] [blame] | 352 | /* |
| 353 | * This delay caused by an i.MXL hardware bug. |
| 354 | * If no (or too short) delay, no "STOP" bit will be generated. |
| 355 | */ |
| 356 | udelay(i2c_imx->disable_delay); |
| 357 | } |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 358 | |
Valentin Longchamp | a1ee06b | 2010-01-21 18:55:32 +0100 | [diff] [blame] | 359 | if (!i2c_imx->stopped) { |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 360 | i2c_imx_bus_busy(i2c_imx, 0); |
Valentin Longchamp | a1ee06b | 2010-01-21 18:55:32 +0100 | [diff] [blame] | 361 | i2c_imx->stopped = 1; |
| 362 | } |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 363 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 364 | /* Disable I2C controller */ |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 365 | temp = i2c_imx->hwdata->i2cr_ien_opcode ^ I2CR_IEN, |
| 366 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
Richard Zhao | 8391433 | 2011-11-15 14:48:08 +0800 | [diff] [blame] | 367 | clk_disable_unprepare(i2c_imx->clk); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 368 | } |
| 369 | |
Wolfram Sang | 3611431 | 2013-10-08 22:35:34 +0200 | [diff] [blame] | 370 | static void i2c_imx_set_clk(struct imx_i2c_struct *i2c_imx, |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 371 | unsigned int rate) |
| 372 | { |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 373 | struct imx_i2c_clk_pair *i2c_clk_div = i2c_imx->hwdata->clk_div; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 374 | unsigned int i2c_clk_rate; |
| 375 | unsigned int div; |
| 376 | int i; |
| 377 | |
| 378 | /* Divider value calculation */ |
| 379 | i2c_clk_rate = clk_get_rate(i2c_imx->clk); |
| 380 | div = (i2c_clk_rate + rate - 1) / rate; |
Jingchang Lu | d533f04 | 2013-08-07 17:05:36 +0800 | [diff] [blame] | 381 | if (div < i2c_clk_div[0].div) |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 382 | i = 0; |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 383 | else if (div > i2c_clk_div[i2c_imx->hwdata->ndivs - 1].div) |
| 384 | i = i2c_imx->hwdata->ndivs - 1; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 385 | else |
Jingchang Lu | d533f04 | 2013-08-07 17:05:36 +0800 | [diff] [blame] | 386 | for (i = 0; i2c_clk_div[i].div < div; i++); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 387 | |
Richard Zhao | db3a3d4 | 2009-10-17 17:46:24 +0800 | [diff] [blame] | 388 | /* Store divider value */ |
Jingchang Lu | d533f04 | 2013-08-07 17:05:36 +0800 | [diff] [blame] | 389 | i2c_imx->ifdr = i2c_clk_div[i].val; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 390 | |
| 391 | /* |
| 392 | * There dummy delay is calculated. |
| 393 | * It should be about one I2C clock period long. |
| 394 | * This delay is used in I2C bus disable function |
| 395 | * to fix chip hardware bug. |
| 396 | */ |
Jingchang Lu | d533f04 | 2013-08-07 17:05:36 +0800 | [diff] [blame] | 397 | i2c_imx->disable_delay = (500000U * i2c_clk_div[i].div |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 398 | + (i2c_clk_rate / 2) - 1) / (i2c_clk_rate / 2); |
| 399 | |
| 400 | /* dev_dbg() can't be used, because adapter is not yet registered */ |
| 401 | #ifdef CONFIG_I2C_DEBUG_BUS |
Fabio Estevam | 002f002 | 2012-08-01 17:38:15 -0300 | [diff] [blame] | 402 | dev_dbg(&i2c_imx->adapter.dev, "<%s> I2C_CLK=%d, REQ DIV=%d\n", |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 403 | __func__, i2c_clk_rate, div); |
Fabio Estevam | 002f002 | 2012-08-01 17:38:15 -0300 | [diff] [blame] | 404 | dev_dbg(&i2c_imx->adapter.dev, "<%s> IFDR[IC]=0x%x, REAL DIV=%d\n", |
Jingchang Lu | d533f04 | 2013-08-07 17:05:36 +0800 | [diff] [blame] | 405 | __func__, i2c_clk_div[i].val, i2c_clk_div[i].div); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 406 | #endif |
| 407 | } |
| 408 | |
| 409 | static irqreturn_t i2c_imx_isr(int irq, void *dev_id) |
| 410 | { |
| 411 | struct imx_i2c_struct *i2c_imx = dev_id; |
| 412 | unsigned int temp; |
| 413 | |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 414 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 415 | if (temp & I2SR_IIF) { |
| 416 | /* save status register */ |
| 417 | i2c_imx->i2csr = temp; |
| 418 | temp &= ~I2SR_IIF; |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 419 | temp |= (i2c_imx->hwdata->i2sr_clr_opcode & I2SR_IIF); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 420 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2SR); |
Marc Kleine-Budde | e39428d | 2010-06-21 09:27:05 +0200 | [diff] [blame] | 421 | wake_up(&i2c_imx->queue); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 422 | return IRQ_HANDLED; |
| 423 | } |
| 424 | |
| 425 | return IRQ_NONE; |
| 426 | } |
| 427 | |
| 428 | static int i2c_imx_write(struct imx_i2c_struct *i2c_imx, struct i2c_msg *msgs) |
| 429 | { |
| 430 | int i, result; |
| 431 | |
| 432 | dev_dbg(&i2c_imx->adapter.dev, "<%s> write slave address: addr=0x%x\n", |
| 433 | __func__, msgs->addr << 1); |
| 434 | |
| 435 | /* write slave address */ |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 436 | imx_i2c_write_reg(msgs->addr << 1, i2c_imx, IMX_I2C_I2DR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 437 | result = i2c_imx_trx_complete(i2c_imx); |
| 438 | if (result) |
| 439 | return result; |
| 440 | result = i2c_imx_acked(i2c_imx); |
| 441 | if (result) |
| 442 | return result; |
| 443 | dev_dbg(&i2c_imx->adapter.dev, "<%s> write data\n", __func__); |
| 444 | |
| 445 | /* write data */ |
| 446 | for (i = 0; i < msgs->len; i++) { |
| 447 | dev_dbg(&i2c_imx->adapter.dev, |
| 448 | "<%s> write byte: B%d=0x%X\n", |
| 449 | __func__, i, msgs->buf[i]); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 450 | imx_i2c_write_reg(msgs->buf[i], i2c_imx, IMX_I2C_I2DR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 451 | result = i2c_imx_trx_complete(i2c_imx); |
| 452 | if (result) |
| 453 | return result; |
| 454 | result = i2c_imx_acked(i2c_imx); |
| 455 | if (result) |
| 456 | return result; |
| 457 | } |
| 458 | return 0; |
| 459 | } |
| 460 | |
| 461 | static int i2c_imx_read(struct imx_i2c_struct *i2c_imx, struct i2c_msg *msgs) |
| 462 | { |
| 463 | int i, result; |
| 464 | unsigned int temp; |
| 465 | |
| 466 | dev_dbg(&i2c_imx->adapter.dev, |
| 467 | "<%s> write slave address: addr=0x%x\n", |
| 468 | __func__, (msgs->addr << 1) | 0x01); |
| 469 | |
| 470 | /* write slave address */ |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 471 | imx_i2c_write_reg((msgs->addr << 1) | 0x01, i2c_imx, IMX_I2C_I2DR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 472 | result = i2c_imx_trx_complete(i2c_imx); |
| 473 | if (result) |
| 474 | return result; |
| 475 | result = i2c_imx_acked(i2c_imx); |
| 476 | if (result) |
| 477 | return result; |
| 478 | |
| 479 | dev_dbg(&i2c_imx->adapter.dev, "<%s> setup bus\n", __func__); |
| 480 | |
| 481 | /* setup bus to read data */ |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 482 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 483 | temp &= ~I2CR_MTX; |
| 484 | if (msgs->len - 1) |
| 485 | temp &= ~I2CR_TXAK; |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 486 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
| 487 | imx_i2c_read_reg(i2c_imx, IMX_I2C_I2DR); /* dummy read */ |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 488 | |
| 489 | dev_dbg(&i2c_imx->adapter.dev, "<%s> read data\n", __func__); |
| 490 | |
| 491 | /* read data */ |
| 492 | for (i = 0; i < msgs->len; i++) { |
| 493 | result = i2c_imx_trx_complete(i2c_imx); |
| 494 | if (result) |
| 495 | return result; |
| 496 | if (i == (msgs->len - 1)) { |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 497 | /* It must generate STOP before read I2DR to prevent |
| 498 | controller from generating another clock cycle */ |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 499 | dev_dbg(&i2c_imx->adapter.dev, |
| 500 | "<%s> clear MSTA\n", __func__); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 501 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 502 | temp &= ~(I2CR_MSTA | I2CR_MTX); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 503 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 504 | i2c_imx_bus_busy(i2c_imx, 0); |
| 505 | i2c_imx->stopped = 1; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 506 | } else if (i == (msgs->len - 2)) { |
| 507 | dev_dbg(&i2c_imx->adapter.dev, |
| 508 | "<%s> set TXAK\n", __func__); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 509 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 510 | temp |= I2CR_TXAK; |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 511 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 512 | } |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 513 | msgs->buf[i] = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2DR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 514 | dev_dbg(&i2c_imx->adapter.dev, |
| 515 | "<%s> read byte: B%d=0x%X\n", |
| 516 | __func__, i, msgs->buf[i]); |
| 517 | } |
| 518 | return 0; |
| 519 | } |
| 520 | |
| 521 | static int i2c_imx_xfer(struct i2c_adapter *adapter, |
| 522 | struct i2c_msg *msgs, int num) |
| 523 | { |
| 524 | unsigned int i, temp; |
| 525 | int result; |
| 526 | struct imx_i2c_struct *i2c_imx = i2c_get_adapdata(adapter); |
| 527 | |
| 528 | dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__); |
| 529 | |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 530 | /* Start I2C transfer */ |
| 531 | result = i2c_imx_start(i2c_imx); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 532 | if (result) |
| 533 | goto fail0; |
| 534 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 535 | /* read/write data */ |
| 536 | for (i = 0; i < num; i++) { |
| 537 | if (i) { |
| 538 | dev_dbg(&i2c_imx->adapter.dev, |
| 539 | "<%s> repeated start\n", __func__); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 540 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 541 | temp |= I2CR_RSTA; |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 542 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 543 | result = i2c_imx_bus_busy(i2c_imx, 1); |
| 544 | if (result) |
| 545 | goto fail0; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 546 | } |
| 547 | dev_dbg(&i2c_imx->adapter.dev, |
| 548 | "<%s> transfer message: %d\n", __func__, i); |
| 549 | /* write/read data */ |
| 550 | #ifdef CONFIG_I2C_DEBUG_BUS |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 551 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 552 | dev_dbg(&i2c_imx->adapter.dev, "<%s> CONTROL: IEN=%d, IIEN=%d, " |
| 553 | "MSTA=%d, MTX=%d, TXAK=%d, RSTA=%d\n", __func__, |
| 554 | (temp & I2CR_IEN ? 1 : 0), (temp & I2CR_IIEN ? 1 : 0), |
| 555 | (temp & I2CR_MSTA ? 1 : 0), (temp & I2CR_MTX ? 1 : 0), |
| 556 | (temp & I2CR_TXAK ? 1 : 0), (temp & I2CR_RSTA ? 1 : 0)); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 557 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 558 | dev_dbg(&i2c_imx->adapter.dev, |
| 559 | "<%s> STATUS: ICF=%d, IAAS=%d, IBB=%d, " |
| 560 | "IAL=%d, SRW=%d, IIF=%d, RXAK=%d\n", __func__, |
| 561 | (temp & I2SR_ICF ? 1 : 0), (temp & I2SR_IAAS ? 1 : 0), |
| 562 | (temp & I2SR_IBB ? 1 : 0), (temp & I2SR_IAL ? 1 : 0), |
| 563 | (temp & I2SR_SRW ? 1 : 0), (temp & I2SR_IIF ? 1 : 0), |
| 564 | (temp & I2SR_RXAK ? 1 : 0)); |
| 565 | #endif |
| 566 | if (msgs[i].flags & I2C_M_RD) |
| 567 | result = i2c_imx_read(i2c_imx, &msgs[i]); |
| 568 | else |
| 569 | result = i2c_imx_write(i2c_imx, &msgs[i]); |
Arnaud Patard | da9c99f | 2010-03-23 17:28:28 +0100 | [diff] [blame] | 570 | if (result) |
| 571 | goto fail0; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 572 | } |
| 573 | |
| 574 | fail0: |
| 575 | /* Stop I2C transfer */ |
| 576 | i2c_imx_stop(i2c_imx); |
| 577 | |
| 578 | dev_dbg(&i2c_imx->adapter.dev, "<%s> exit with: %s: %d\n", __func__, |
| 579 | (result < 0) ? "error" : "success msg", |
| 580 | (result < 0) ? result : num); |
| 581 | return (result < 0) ? result : num; |
| 582 | } |
| 583 | |
| 584 | static u32 i2c_imx_func(struct i2c_adapter *adapter) |
| 585 | { |
| 586 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; |
| 587 | } |
| 588 | |
| 589 | static struct i2c_algorithm i2c_imx_algo = { |
| 590 | .master_xfer = i2c_imx_xfer, |
| 591 | .functionality = i2c_imx_func, |
| 592 | }; |
| 593 | |
Wolfram Sang | 3611431 | 2013-10-08 22:35:34 +0200 | [diff] [blame] | 594 | static int i2c_imx_probe(struct platform_device *pdev) |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 595 | { |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 596 | const struct of_device_id *of_id = of_match_device(i2c_imx_dt_ids, |
| 597 | &pdev->dev); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 598 | struct imx_i2c_struct *i2c_imx; |
| 599 | struct resource *res; |
Jingoo Han | 6d4028c | 2013-07-30 16:59:33 +0900 | [diff] [blame] | 600 | struct imxi2c_platform_data *pdata = dev_get_platdata(&pdev->dev); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 601 | void __iomem *base; |
Wolfram Sang | 8c88ab0 | 2012-07-08 13:11:43 +0200 | [diff] [blame] | 602 | int irq, ret; |
| 603 | u32 bitrate; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 604 | |
| 605 | dev_dbg(&pdev->dev, "<%s>\n", __func__); |
| 606 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 607 | irq = platform_get_irq(pdev, 0); |
| 608 | if (irq < 0) { |
| 609 | dev_err(&pdev->dev, "can't get irq number\n"); |
Wolfram Sang | a8763f3 | 2013-12-12 22:51:31 +0100 | [diff] [blame^] | 610 | return irq; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 611 | } |
| 612 | |
Wolfram Sang | 3cc2d00 | 2013-05-10 10:16:54 +0200 | [diff] [blame] | 613 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
Thierry Reding | 84dbf80 | 2013-01-21 11:09:03 +0100 | [diff] [blame] | 614 | base = devm_ioremap_resource(&pdev->dev, res); |
| 615 | if (IS_ERR(base)) |
| 616 | return PTR_ERR(base); |
Uwe Kleine-König | 4927fbf | 2010-01-08 17:23:17 +0100 | [diff] [blame] | 617 | |
Richard Zhao | 9f8a3e7 | 2012-06-04 19:04:25 +0800 | [diff] [blame] | 618 | i2c_imx = devm_kzalloc(&pdev->dev, sizeof(struct imx_i2c_struct), |
| 619 | GFP_KERNEL); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 620 | if (!i2c_imx) { |
| 621 | dev_err(&pdev->dev, "can't allocate interface\n"); |
Richard Zhao | 9f8a3e7 | 2012-06-04 19:04:25 +0800 | [diff] [blame] | 622 | return -ENOMEM; |
Darius Augulis | 309c18d | 2009-03-31 14:52:54 +0300 | [diff] [blame] | 623 | } |
| 624 | |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 625 | if (of_id) |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 626 | i2c_imx->hwdata = of_id->data; |
Jingchang Lu | 0fc1347 | 2013-08-07 17:05:38 +0800 | [diff] [blame] | 627 | else |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 628 | i2c_imx->hwdata = (struct imx_i2c_hwdata *) |
| 629 | platform_get_device_id(pdev)->driver_data; |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 630 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 631 | /* Setup i2c_imx driver structure */ |
Wolfram Sang | 973c5ed | 2012-04-19 17:31:01 +0200 | [diff] [blame] | 632 | strlcpy(i2c_imx->adapter.name, pdev->name, sizeof(i2c_imx->adapter.name)); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 633 | i2c_imx->adapter.owner = THIS_MODULE; |
| 634 | i2c_imx->adapter.algo = &i2c_imx_algo; |
| 635 | i2c_imx->adapter.dev.parent = &pdev->dev; |
| 636 | i2c_imx->adapter.nr = pdev->id; |
Shawn Guo | dfcd04b | 2011-09-08 15:09:35 +0800 | [diff] [blame] | 637 | i2c_imx->adapter.dev.of_node = pdev->dev.of_node; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 638 | i2c_imx->base = base; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 639 | |
| 640 | /* Get I2C clock */ |
Fabio Estevam | 1f09c67 | 2012-07-06 15:31:32 -0300 | [diff] [blame] | 641 | i2c_imx->clk = devm_clk_get(&pdev->dev, NULL); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 642 | if (IS_ERR(i2c_imx->clk)) { |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 643 | dev_err(&pdev->dev, "can't get I2C clock\n"); |
Richard Zhao | 9f8a3e7 | 2012-06-04 19:04:25 +0800 | [diff] [blame] | 644 | return PTR_ERR(i2c_imx->clk); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 645 | } |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 646 | |
Jingchang Lu | 46f2832 | 2013-08-07 17:05:37 +0800 | [diff] [blame] | 647 | ret = clk_prepare_enable(i2c_imx->clk); |
| 648 | if (ret) { |
| 649 | dev_err(&pdev->dev, "can't enable I2C clock\n"); |
| 650 | return ret; |
| 651 | } |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 652 | /* Request IRQ */ |
Richard Zhao | 9f8a3e7 | 2012-06-04 19:04:25 +0800 | [diff] [blame] | 653 | ret = devm_request_irq(&pdev->dev, irq, i2c_imx_isr, 0, |
| 654 | pdev->name, i2c_imx); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 655 | if (ret) { |
Richard Zhao | 9f8a3e7 | 2012-06-04 19:04:25 +0800 | [diff] [blame] | 656 | dev_err(&pdev->dev, "can't claim irq %d\n", irq); |
| 657 | return ret; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 658 | } |
| 659 | |
| 660 | /* Init queue */ |
| 661 | init_waitqueue_head(&i2c_imx->queue); |
| 662 | |
| 663 | /* Set up adapter data */ |
| 664 | i2c_set_adapdata(&i2c_imx->adapter, i2c_imx); |
| 665 | |
| 666 | /* Set up clock divider */ |
Shawn Guo | dfcd04b | 2011-09-08 15:09:35 +0800 | [diff] [blame] | 667 | bitrate = IMX_I2C_BIT_RATE; |
| 668 | ret = of_property_read_u32(pdev->dev.of_node, |
| 669 | "clock-frequency", &bitrate); |
| 670 | if (ret < 0 && pdata && pdata->bitrate) |
| 671 | bitrate = pdata->bitrate; |
| 672 | i2c_imx_set_clk(i2c_imx, bitrate); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 673 | |
| 674 | /* Set up chip registers to defaults */ |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 675 | imx_i2c_write_reg(i2c_imx->hwdata->i2cr_ien_opcode ^ I2CR_IEN, |
| 676 | i2c_imx, IMX_I2C_I2CR); |
| 677 | imx_i2c_write_reg(i2c_imx->hwdata->i2sr_clr_opcode, i2c_imx, IMX_I2C_I2SR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 678 | |
| 679 | /* Add I2C adapter */ |
| 680 | ret = i2c_add_numbered_adapter(&i2c_imx->adapter); |
| 681 | if (ret < 0) { |
| 682 | dev_err(&pdev->dev, "registration failed\n"); |
Richard Zhao | 9f8a3e7 | 2012-06-04 19:04:25 +0800 | [diff] [blame] | 683 | return ret; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 684 | } |
| 685 | |
| 686 | /* Set up platform driver data */ |
| 687 | platform_set_drvdata(pdev, i2c_imx); |
Jingchang Lu | 46f2832 | 2013-08-07 17:05:37 +0800 | [diff] [blame] | 688 | clk_disable_unprepare(i2c_imx->clk); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 689 | |
Richard Zhao | 9f8a3e7 | 2012-06-04 19:04:25 +0800 | [diff] [blame] | 690 | dev_dbg(&i2c_imx->adapter.dev, "claimed irq %d\n", irq); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 691 | dev_dbg(&i2c_imx->adapter.dev, "device resources from 0x%x to 0x%x\n", |
Richard Zhao | 9f8a3e7 | 2012-06-04 19:04:25 +0800 | [diff] [blame] | 692 | res->start, res->end); |
| 693 | dev_dbg(&i2c_imx->adapter.dev, "allocated %d bytes at 0x%x\n", |
| 694 | resource_size(res), res->start); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 695 | dev_dbg(&i2c_imx->adapter.dev, "adapter name: \"%s\"\n", |
| 696 | i2c_imx->adapter.name); |
Fabio Estevam | 06d141e | 2012-08-01 17:38:14 -0300 | [diff] [blame] | 697 | dev_info(&i2c_imx->adapter.dev, "IMX I2C adapter registered\n"); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 698 | |
| 699 | return 0; /* Return OK */ |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 700 | } |
| 701 | |
Wolfram Sang | 3611431 | 2013-10-08 22:35:34 +0200 | [diff] [blame] | 702 | static int i2c_imx_remove(struct platform_device *pdev) |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 703 | { |
| 704 | struct imx_i2c_struct *i2c_imx = platform_get_drvdata(pdev); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 705 | |
| 706 | /* remove adapter */ |
| 707 | dev_dbg(&i2c_imx->adapter.dev, "adapter removed\n"); |
| 708 | i2c_del_adapter(&i2c_imx->adapter); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 709 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 710 | /* setup chip registers to defaults */ |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 711 | imx_i2c_write_reg(0, i2c_imx, IMX_I2C_IADR); |
| 712 | imx_i2c_write_reg(0, i2c_imx, IMX_I2C_IFDR); |
| 713 | imx_i2c_write_reg(0, i2c_imx, IMX_I2C_I2CR); |
| 714 | imx_i2c_write_reg(0, i2c_imx, IMX_I2C_I2SR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 715 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 716 | return 0; |
| 717 | } |
| 718 | |
| 719 | static struct platform_driver i2c_imx_driver = { |
Wolfram Sang | 3611431 | 2013-10-08 22:35:34 +0200 | [diff] [blame] | 720 | .probe = i2c_imx_probe, |
| 721 | .remove = i2c_imx_remove, |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 722 | .driver = { |
| 723 | .name = DRIVER_NAME, |
| 724 | .owner = THIS_MODULE, |
Shawn Guo | dfcd04b | 2011-09-08 15:09:35 +0800 | [diff] [blame] | 725 | .of_match_table = i2c_imx_dt_ids, |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 726 | }, |
| 727 | .id_table = imx_i2c_devtype, |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 728 | }; |
| 729 | |
| 730 | static int __init i2c_adap_imx_init(void) |
| 731 | { |
Wolfram Sang | 3611431 | 2013-10-08 22:35:34 +0200 | [diff] [blame] | 732 | return platform_driver_register(&i2c_imx_driver); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 733 | } |
Wolfram Sang | 5d3f333 | 2009-09-19 09:09:50 +0200 | [diff] [blame] | 734 | subsys_initcall(i2c_adap_imx_init); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 735 | |
| 736 | static void __exit i2c_adap_imx_exit(void) |
| 737 | { |
| 738 | platform_driver_unregister(&i2c_imx_driver); |
| 739 | } |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 740 | module_exit(i2c_adap_imx_exit); |
| 741 | |
| 742 | MODULE_LICENSE("GPL"); |
| 743 | MODULE_AUTHOR("Darius Augulis"); |
| 744 | MODULE_DESCRIPTION("I2C adapter driver for IMX I2C bus"); |
| 745 | MODULE_ALIAS("platform:" DRIVER_NAME); |