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> |
| 55 | #include <linux/of_i2c.h> |
Arnd Bergmann | 82906b1 | 2012-08-24 15:14:29 +0200 | [diff] [blame] | 56 | #include <linux/platform_data/i2c-imx.h> |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 57 | |
| 58 | /** Defines ******************************************************************** |
| 59 | *******************************************************************************/ |
| 60 | |
| 61 | /* This will be the driver name the kernel reports */ |
| 62 | #define DRIVER_NAME "imx-i2c" |
| 63 | |
| 64 | /* Default value */ |
| 65 | #define IMX_I2C_BIT_RATE 100000 /* 100kHz */ |
| 66 | |
Jingchang Lu | 8cc7331 | 2013-08-07 17:05:40 +0800 | [diff] [blame] | 67 | /* IMX I2C registers: |
| 68 | * the I2C register offset is different between SoCs, |
| 69 | * to provid support for all these chips, split the |
| 70 | * register offset into a fixed base address and a |
| 71 | * variable shift value, then the full register offset |
| 72 | * will be calculated by |
| 73 | * reg_off = ( reg_base_addr << reg_shift) |
| 74 | */ |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 75 | #define IMX_I2C_IADR 0x00 /* i2c slave address */ |
Jingchang Lu | 8cc7331 | 2013-08-07 17:05:40 +0800 | [diff] [blame] | 76 | #define IMX_I2C_IFDR 0x01 /* i2c frequency divider */ |
| 77 | #define IMX_I2C_I2CR 0x02 /* i2c control */ |
| 78 | #define IMX_I2C_I2SR 0x03 /* i2c status */ |
| 79 | #define IMX_I2C_I2DR 0x04 /* i2c transfer data */ |
| 80 | |
| 81 | #define IMX_I2C_REGSHIFT 2 |
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 | |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 143 | enum imx_i2c_type { |
| 144 | IMX1_I2C, |
| 145 | IMX21_I2C, |
| 146 | }; |
| 147 | |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame^] | 148 | struct imx_i2c_hwdata { |
| 149 | enum imx_i2c_type devtype; |
| 150 | unsigned regshift; |
| 151 | struct imx_i2c_clk_pair *clk_div; |
| 152 | unsigned ndivs; |
| 153 | unsigned i2sr_clr_opcode; |
| 154 | unsigned i2cr_ien_opcode; |
| 155 | }; |
| 156 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 157 | struct imx_i2c_struct { |
| 158 | struct i2c_adapter adapter; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 159 | struct clk *clk; |
| 160 | void __iomem *base; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 161 | wait_queue_head_t queue; |
| 162 | unsigned long i2csr; |
Wolfram Sang | 65de394 | 2009-04-06 16:27:45 +0200 | [diff] [blame] | 163 | unsigned int disable_delay; |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 164 | int stopped; |
Richard Zhao | db3a3d4 | 2009-10-17 17:46:24 +0800 | [diff] [blame] | 165 | unsigned int ifdr; /* IMX_I2C_IFDR */ |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame^] | 166 | const struct imx_i2c_hwdata *hwdata; |
| 167 | }; |
| 168 | |
| 169 | static const struct imx_i2c_hwdata imx1_i2c_hwdata = { |
| 170 | .devtype = IMX1_I2C, |
| 171 | .regshift = IMX_I2C_REGSHIFT, |
| 172 | .clk_div = imx_i2c_clk_div, |
| 173 | .ndivs = ARRAY_SIZE(imx_i2c_clk_div), |
| 174 | .i2sr_clr_opcode = I2SR_CLR_OPCODE_W0C, |
| 175 | .i2cr_ien_opcode = I2CR_IEN_OPCODE_1, |
| 176 | |
| 177 | }; |
| 178 | |
| 179 | static const struct imx_i2c_hwdata imx21_i2c_hwdata = { |
| 180 | .devtype = IMX21_I2C, |
| 181 | .regshift = IMX_I2C_REGSHIFT, |
| 182 | .clk_div = imx_i2c_clk_div, |
| 183 | .ndivs = ARRAY_SIZE(imx_i2c_clk_div), |
| 184 | .i2sr_clr_opcode = I2SR_CLR_OPCODE_W0C, |
| 185 | .i2cr_ien_opcode = I2CR_IEN_OPCODE_1, |
| 186 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 187 | }; |
| 188 | |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 189 | static struct platform_device_id imx_i2c_devtype[] = { |
| 190 | { |
| 191 | .name = "imx1-i2c", |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame^] | 192 | .driver_data = (kernel_ulong_t)&imx1_i2c_hwdata, |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 193 | }, { |
| 194 | .name = "imx21-i2c", |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame^] | 195 | .driver_data = (kernel_ulong_t)&imx21_i2c_hwdata, |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 196 | }, { |
| 197 | /* sentinel */ |
| 198 | } |
| 199 | }; |
| 200 | MODULE_DEVICE_TABLE(platform, imx_i2c_devtype); |
| 201 | |
Shawn Guo | dfcd04b | 2011-09-08 15:09:35 +0800 | [diff] [blame] | 202 | static const struct of_device_id i2c_imx_dt_ids[] = { |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame^] | 203 | { .compatible = "fsl,imx1-i2c", .data = &imx1_i2c_hwdata, }, |
| 204 | { .compatible = "fsl,imx21-i2c", .data = &imx21_i2c_hwdata, }, |
Shawn Guo | dfcd04b | 2011-09-08 15:09:35 +0800 | [diff] [blame] | 205 | { /* sentinel */ } |
| 206 | }; |
Arnaud Patard \(Rtp\) | 2f641a8 | 2013-06-20 23:07:06 +0200 | [diff] [blame] | 207 | MODULE_DEVICE_TABLE(of, i2c_imx_dt_ids); |
Shawn Guo | dfcd04b | 2011-09-08 15:09:35 +0800 | [diff] [blame] | 208 | |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 209 | static inline int is_imx1_i2c(struct imx_i2c_struct *i2c_imx) |
| 210 | { |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame^] | 211 | return i2c_imx->hwdata->devtype == IMX1_I2C; |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 212 | } |
| 213 | |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 214 | static inline void imx_i2c_write_reg(unsigned int val, |
| 215 | struct imx_i2c_struct *i2c_imx, unsigned int reg) |
| 216 | { |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame^] | 217 | writeb(val, i2c_imx->base + (reg << i2c_imx->hwdata->regshift)); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 218 | } |
| 219 | |
| 220 | static inline unsigned char imx_i2c_read_reg(struct imx_i2c_struct *i2c_imx, |
| 221 | unsigned int reg) |
| 222 | { |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame^] | 223 | return readb(i2c_imx->base + (reg << i2c_imx->hwdata->regshift)); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 224 | } |
| 225 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 226 | /** Functions for IMX I2C adapter driver *************************************** |
| 227 | *******************************************************************************/ |
| 228 | |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 229 | 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] | 230 | { |
| 231 | unsigned long orig_jiffies = jiffies; |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 232 | unsigned int temp; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 233 | |
| 234 | dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__); |
| 235 | |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 236 | while (1) { |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 237 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR); |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 238 | if (for_busy && (temp & I2SR_IBB)) |
| 239 | break; |
| 240 | if (!for_busy && !(temp & I2SR_IBB)) |
| 241 | break; |
Arnaud Patard | da9c99f | 2010-03-23 17:28:28 +0100 | [diff] [blame] | 242 | if (time_after(jiffies, orig_jiffies + msecs_to_jiffies(500))) { |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 243 | dev_dbg(&i2c_imx->adapter.dev, |
| 244 | "<%s> I2C bus is busy\n", __func__); |
Arnaud Patard | da9c99f | 2010-03-23 17:28:28 +0100 | [diff] [blame] | 245 | return -ETIMEDOUT; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 246 | } |
| 247 | schedule(); |
| 248 | } |
| 249 | |
| 250 | return 0; |
| 251 | } |
| 252 | |
| 253 | static int i2c_imx_trx_complete(struct imx_i2c_struct *i2c_imx) |
| 254 | { |
Marc Kleine-Budde | e39428d | 2010-06-21 09:27:05 +0200 | [diff] [blame] | 255 | 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] | 256 | |
Marc Kleine-Budde | e39428d | 2010-06-21 09:27:05 +0200 | [diff] [blame] | 257 | if (unlikely(!(i2c_imx->i2csr & I2SR_IIF))) { |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 258 | dev_dbg(&i2c_imx->adapter.dev, "<%s> Timeout\n", __func__); |
| 259 | return -ETIMEDOUT; |
| 260 | } |
| 261 | dev_dbg(&i2c_imx->adapter.dev, "<%s> TRX complete\n", __func__); |
| 262 | i2c_imx->i2csr = 0; |
| 263 | return 0; |
| 264 | } |
| 265 | |
| 266 | static int i2c_imx_acked(struct imx_i2c_struct *i2c_imx) |
| 267 | { |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 268 | if (imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR) & I2SR_RXAK) { |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 269 | dev_dbg(&i2c_imx->adapter.dev, "<%s> No ACK\n", __func__); |
| 270 | return -EIO; /* No ACK */ |
| 271 | } |
| 272 | |
| 273 | dev_dbg(&i2c_imx->adapter.dev, "<%s> ACK received\n", __func__); |
| 274 | return 0; |
| 275 | } |
| 276 | |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 277 | static int i2c_imx_start(struct imx_i2c_struct *i2c_imx) |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 278 | { |
| 279 | unsigned int temp = 0; |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 280 | int result; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 281 | |
| 282 | dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__); |
| 283 | |
Richard Zhao | 8391433 | 2011-11-15 14:48:08 +0800 | [diff] [blame] | 284 | clk_prepare_enable(i2c_imx->clk); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 285 | imx_i2c_write_reg(i2c_imx->ifdr, i2c_imx, IMX_I2C_IFDR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 286 | /* Enable I2C controller */ |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame^] | 287 | imx_i2c_write_reg(i2c_imx->hwdata->i2sr_clr_opcode, i2c_imx, IMX_I2C_I2SR); |
| 288 | 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] | 289 | |
| 290 | /* Wait controller to be stable */ |
| 291 | udelay(50); |
| 292 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 293 | /* Start I2C transaction */ |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 294 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 295 | temp |= I2CR_MSTA; |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 296 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 297 | result = i2c_imx_bus_busy(i2c_imx, 1); |
| 298 | if (result) |
| 299 | return result; |
| 300 | i2c_imx->stopped = 0; |
| 301 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 302 | temp |= I2CR_IIEN | I2CR_MTX | I2CR_TXAK; |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 303 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 304 | return result; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 305 | } |
| 306 | |
| 307 | static void i2c_imx_stop(struct imx_i2c_struct *i2c_imx) |
| 308 | { |
| 309 | unsigned int temp = 0; |
| 310 | |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 311 | if (!i2c_imx->stopped) { |
| 312 | /* Stop I2C transaction */ |
| 313 | dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 314 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 315 | temp &= ~(I2CR_MSTA | I2CR_MTX); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 316 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 317 | } |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 318 | if (is_imx1_i2c(i2c_imx)) { |
Richard Zhao | a4094a7 | 2009-10-17 17:46:23 +0800 | [diff] [blame] | 319 | /* |
| 320 | * This delay caused by an i.MXL hardware bug. |
| 321 | * If no (or too short) delay, no "STOP" bit will be generated. |
| 322 | */ |
| 323 | udelay(i2c_imx->disable_delay); |
| 324 | } |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 325 | |
Valentin Longchamp | a1ee06b | 2010-01-21 18:55:32 +0100 | [diff] [blame] | 326 | if (!i2c_imx->stopped) { |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 327 | i2c_imx_bus_busy(i2c_imx, 0); |
Valentin Longchamp | a1ee06b | 2010-01-21 18:55:32 +0100 | [diff] [blame] | 328 | i2c_imx->stopped = 1; |
| 329 | } |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 330 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 331 | /* Disable I2C controller */ |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame^] | 332 | temp = i2c_imx->hwdata->i2cr_ien_opcode ^ I2CR_IEN, |
| 333 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
Richard Zhao | 8391433 | 2011-11-15 14:48:08 +0800 | [diff] [blame] | 334 | clk_disable_unprepare(i2c_imx->clk); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 335 | } |
| 336 | |
| 337 | static void __init i2c_imx_set_clk(struct imx_i2c_struct *i2c_imx, |
| 338 | unsigned int rate) |
| 339 | { |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame^] | 340 | 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] | 341 | unsigned int i2c_clk_rate; |
| 342 | unsigned int div; |
| 343 | int i; |
| 344 | |
| 345 | /* Divider value calculation */ |
| 346 | i2c_clk_rate = clk_get_rate(i2c_imx->clk); |
| 347 | div = (i2c_clk_rate + rate - 1) / rate; |
Jingchang Lu | d533f04 | 2013-08-07 17:05:36 +0800 | [diff] [blame] | 348 | if (div < i2c_clk_div[0].div) |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 349 | i = 0; |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame^] | 350 | else if (div > i2c_clk_div[i2c_imx->hwdata->ndivs - 1].div) |
| 351 | i = i2c_imx->hwdata->ndivs - 1; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 352 | else |
Jingchang Lu | d533f04 | 2013-08-07 17:05:36 +0800 | [diff] [blame] | 353 | for (i = 0; i2c_clk_div[i].div < div; i++); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 354 | |
Richard Zhao | db3a3d4 | 2009-10-17 17:46:24 +0800 | [diff] [blame] | 355 | /* Store divider value */ |
Jingchang Lu | d533f04 | 2013-08-07 17:05:36 +0800 | [diff] [blame] | 356 | i2c_imx->ifdr = i2c_clk_div[i].val; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 357 | |
| 358 | /* |
| 359 | * There dummy delay is calculated. |
| 360 | * It should be about one I2C clock period long. |
| 361 | * This delay is used in I2C bus disable function |
| 362 | * to fix chip hardware bug. |
| 363 | */ |
Jingchang Lu | d533f04 | 2013-08-07 17:05:36 +0800 | [diff] [blame] | 364 | i2c_imx->disable_delay = (500000U * i2c_clk_div[i].div |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 365 | + (i2c_clk_rate / 2) - 1) / (i2c_clk_rate / 2); |
| 366 | |
| 367 | /* dev_dbg() can't be used, because adapter is not yet registered */ |
| 368 | #ifdef CONFIG_I2C_DEBUG_BUS |
Fabio Estevam | 002f002 | 2012-08-01 17:38:15 -0300 | [diff] [blame] | 369 | 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] | 370 | __func__, i2c_clk_rate, div); |
Fabio Estevam | 002f002 | 2012-08-01 17:38:15 -0300 | [diff] [blame] | 371 | 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] | 372 | __func__, i2c_clk_div[i].val, i2c_clk_div[i].div); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 373 | #endif |
| 374 | } |
| 375 | |
| 376 | static irqreturn_t i2c_imx_isr(int irq, void *dev_id) |
| 377 | { |
| 378 | struct imx_i2c_struct *i2c_imx = dev_id; |
| 379 | unsigned int temp; |
| 380 | |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 381 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 382 | if (temp & I2SR_IIF) { |
| 383 | /* save status register */ |
| 384 | i2c_imx->i2csr = temp; |
| 385 | temp &= ~I2SR_IIF; |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame^] | 386 | temp |= (i2c_imx->hwdata->i2sr_clr_opcode & I2SR_IIF); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 387 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2SR); |
Marc Kleine-Budde | e39428d | 2010-06-21 09:27:05 +0200 | [diff] [blame] | 388 | wake_up(&i2c_imx->queue); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 389 | return IRQ_HANDLED; |
| 390 | } |
| 391 | |
| 392 | return IRQ_NONE; |
| 393 | } |
| 394 | |
| 395 | static int i2c_imx_write(struct imx_i2c_struct *i2c_imx, struct i2c_msg *msgs) |
| 396 | { |
| 397 | int i, result; |
| 398 | |
| 399 | dev_dbg(&i2c_imx->adapter.dev, "<%s> write slave address: addr=0x%x\n", |
| 400 | __func__, msgs->addr << 1); |
| 401 | |
| 402 | /* write slave address */ |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 403 | imx_i2c_write_reg(msgs->addr << 1, i2c_imx, IMX_I2C_I2DR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 404 | result = i2c_imx_trx_complete(i2c_imx); |
| 405 | if (result) |
| 406 | return result; |
| 407 | result = i2c_imx_acked(i2c_imx); |
| 408 | if (result) |
| 409 | return result; |
| 410 | dev_dbg(&i2c_imx->adapter.dev, "<%s> write data\n", __func__); |
| 411 | |
| 412 | /* write data */ |
| 413 | for (i = 0; i < msgs->len; i++) { |
| 414 | dev_dbg(&i2c_imx->adapter.dev, |
| 415 | "<%s> write byte: B%d=0x%X\n", |
| 416 | __func__, i, msgs->buf[i]); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 417 | imx_i2c_write_reg(msgs->buf[i], i2c_imx, IMX_I2C_I2DR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 418 | result = i2c_imx_trx_complete(i2c_imx); |
| 419 | if (result) |
| 420 | return result; |
| 421 | result = i2c_imx_acked(i2c_imx); |
| 422 | if (result) |
| 423 | return result; |
| 424 | } |
| 425 | return 0; |
| 426 | } |
| 427 | |
| 428 | static int i2c_imx_read(struct imx_i2c_struct *i2c_imx, struct i2c_msg *msgs) |
| 429 | { |
| 430 | int i, result; |
| 431 | unsigned int temp; |
| 432 | |
| 433 | dev_dbg(&i2c_imx->adapter.dev, |
| 434 | "<%s> write slave address: addr=0x%x\n", |
| 435 | __func__, (msgs->addr << 1) | 0x01); |
| 436 | |
| 437 | /* write slave address */ |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 438 | 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] | 439 | result = i2c_imx_trx_complete(i2c_imx); |
| 440 | if (result) |
| 441 | return result; |
| 442 | result = i2c_imx_acked(i2c_imx); |
| 443 | if (result) |
| 444 | return result; |
| 445 | |
| 446 | dev_dbg(&i2c_imx->adapter.dev, "<%s> setup bus\n", __func__); |
| 447 | |
| 448 | /* setup bus to read data */ |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 449 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 450 | temp &= ~I2CR_MTX; |
| 451 | if (msgs->len - 1) |
| 452 | temp &= ~I2CR_TXAK; |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 453 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
| 454 | imx_i2c_read_reg(i2c_imx, IMX_I2C_I2DR); /* dummy read */ |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 455 | |
| 456 | dev_dbg(&i2c_imx->adapter.dev, "<%s> read data\n", __func__); |
| 457 | |
| 458 | /* read data */ |
| 459 | for (i = 0; i < msgs->len; i++) { |
| 460 | result = i2c_imx_trx_complete(i2c_imx); |
| 461 | if (result) |
| 462 | return result; |
| 463 | if (i == (msgs->len - 1)) { |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 464 | /* It must generate STOP before read I2DR to prevent |
| 465 | controller from generating another clock cycle */ |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 466 | dev_dbg(&i2c_imx->adapter.dev, |
| 467 | "<%s> clear MSTA\n", __func__); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 468 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 469 | temp &= ~(I2CR_MSTA | I2CR_MTX); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 470 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 471 | i2c_imx_bus_busy(i2c_imx, 0); |
| 472 | i2c_imx->stopped = 1; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 473 | } else if (i == (msgs->len - 2)) { |
| 474 | dev_dbg(&i2c_imx->adapter.dev, |
| 475 | "<%s> set TXAK\n", __func__); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 476 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 477 | temp |= I2CR_TXAK; |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 478 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 479 | } |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 480 | msgs->buf[i] = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2DR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 481 | dev_dbg(&i2c_imx->adapter.dev, |
| 482 | "<%s> read byte: B%d=0x%X\n", |
| 483 | __func__, i, msgs->buf[i]); |
| 484 | } |
| 485 | return 0; |
| 486 | } |
| 487 | |
| 488 | static int i2c_imx_xfer(struct i2c_adapter *adapter, |
| 489 | struct i2c_msg *msgs, int num) |
| 490 | { |
| 491 | unsigned int i, temp; |
| 492 | int result; |
| 493 | struct imx_i2c_struct *i2c_imx = i2c_get_adapdata(adapter); |
| 494 | |
| 495 | dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__); |
| 496 | |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 497 | /* Start I2C transfer */ |
| 498 | result = i2c_imx_start(i2c_imx); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 499 | if (result) |
| 500 | goto fail0; |
| 501 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 502 | /* read/write data */ |
| 503 | for (i = 0; i < num; i++) { |
| 504 | if (i) { |
| 505 | dev_dbg(&i2c_imx->adapter.dev, |
| 506 | "<%s> repeated start\n", __func__); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 507 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 508 | temp |= I2CR_RSTA; |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 509 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 510 | result = i2c_imx_bus_busy(i2c_imx, 1); |
| 511 | if (result) |
| 512 | goto fail0; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 513 | } |
| 514 | dev_dbg(&i2c_imx->adapter.dev, |
| 515 | "<%s> transfer message: %d\n", __func__, i); |
| 516 | /* write/read data */ |
| 517 | #ifdef CONFIG_I2C_DEBUG_BUS |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 518 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 519 | dev_dbg(&i2c_imx->adapter.dev, "<%s> CONTROL: IEN=%d, IIEN=%d, " |
| 520 | "MSTA=%d, MTX=%d, TXAK=%d, RSTA=%d\n", __func__, |
| 521 | (temp & I2CR_IEN ? 1 : 0), (temp & I2CR_IIEN ? 1 : 0), |
| 522 | (temp & I2CR_MSTA ? 1 : 0), (temp & I2CR_MTX ? 1 : 0), |
| 523 | (temp & I2CR_TXAK ? 1 : 0), (temp & I2CR_RSTA ? 1 : 0)); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 524 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 525 | dev_dbg(&i2c_imx->adapter.dev, |
| 526 | "<%s> STATUS: ICF=%d, IAAS=%d, IBB=%d, " |
| 527 | "IAL=%d, SRW=%d, IIF=%d, RXAK=%d\n", __func__, |
| 528 | (temp & I2SR_ICF ? 1 : 0), (temp & I2SR_IAAS ? 1 : 0), |
| 529 | (temp & I2SR_IBB ? 1 : 0), (temp & I2SR_IAL ? 1 : 0), |
| 530 | (temp & I2SR_SRW ? 1 : 0), (temp & I2SR_IIF ? 1 : 0), |
| 531 | (temp & I2SR_RXAK ? 1 : 0)); |
| 532 | #endif |
| 533 | if (msgs[i].flags & I2C_M_RD) |
| 534 | result = i2c_imx_read(i2c_imx, &msgs[i]); |
| 535 | else |
| 536 | result = i2c_imx_write(i2c_imx, &msgs[i]); |
Arnaud Patard | da9c99f | 2010-03-23 17:28:28 +0100 | [diff] [blame] | 537 | if (result) |
| 538 | goto fail0; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 539 | } |
| 540 | |
| 541 | fail0: |
| 542 | /* Stop I2C transfer */ |
| 543 | i2c_imx_stop(i2c_imx); |
| 544 | |
| 545 | dev_dbg(&i2c_imx->adapter.dev, "<%s> exit with: %s: %d\n", __func__, |
| 546 | (result < 0) ? "error" : "success msg", |
| 547 | (result < 0) ? result : num); |
| 548 | return (result < 0) ? result : num; |
| 549 | } |
| 550 | |
| 551 | static u32 i2c_imx_func(struct i2c_adapter *adapter) |
| 552 | { |
| 553 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; |
| 554 | } |
| 555 | |
| 556 | static struct i2c_algorithm i2c_imx_algo = { |
| 557 | .master_xfer = i2c_imx_xfer, |
| 558 | .functionality = i2c_imx_func, |
| 559 | }; |
| 560 | |
| 561 | static int __init i2c_imx_probe(struct platform_device *pdev) |
| 562 | { |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 563 | const struct of_device_id *of_id = of_match_device(i2c_imx_dt_ids, |
| 564 | &pdev->dev); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 565 | struct imx_i2c_struct *i2c_imx; |
| 566 | struct resource *res; |
Shawn Guo | 593702c | 2011-09-08 15:09:34 +0800 | [diff] [blame] | 567 | struct imxi2c_platform_data *pdata = pdev->dev.platform_data; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 568 | void __iomem *base; |
Wolfram Sang | 8c88ab0 | 2012-07-08 13:11:43 +0200 | [diff] [blame] | 569 | int irq, ret; |
| 570 | u32 bitrate; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 571 | |
| 572 | dev_dbg(&pdev->dev, "<%s>\n", __func__); |
| 573 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 574 | irq = platform_get_irq(pdev, 0); |
| 575 | if (irq < 0) { |
| 576 | dev_err(&pdev->dev, "can't get irq number\n"); |
| 577 | return -ENOENT; |
| 578 | } |
| 579 | |
Wolfram Sang | 3cc2d00 | 2013-05-10 10:16:54 +0200 | [diff] [blame] | 580 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
Thierry Reding | 84dbf80 | 2013-01-21 11:09:03 +0100 | [diff] [blame] | 581 | base = devm_ioremap_resource(&pdev->dev, res); |
| 582 | if (IS_ERR(base)) |
| 583 | return PTR_ERR(base); |
Uwe Kleine-König | 4927fbf | 2010-01-08 17:23:17 +0100 | [diff] [blame] | 584 | |
Richard Zhao | 9f8a3e7 | 2012-06-04 19:04:25 +0800 | [diff] [blame] | 585 | i2c_imx = devm_kzalloc(&pdev->dev, sizeof(struct imx_i2c_struct), |
| 586 | GFP_KERNEL); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 587 | if (!i2c_imx) { |
| 588 | dev_err(&pdev->dev, "can't allocate interface\n"); |
Richard Zhao | 9f8a3e7 | 2012-06-04 19:04:25 +0800 | [diff] [blame] | 589 | return -ENOMEM; |
Darius Augulis | 309c18d | 2009-03-31 14:52:54 +0300 | [diff] [blame] | 590 | } |
| 591 | |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 592 | if (of_id) |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame^] | 593 | i2c_imx->hwdata = of_id->data; |
Jingchang Lu | 0fc1347 | 2013-08-07 17:05:38 +0800 | [diff] [blame] | 594 | else |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame^] | 595 | i2c_imx->hwdata = (struct imx_i2c_hwdata *) |
| 596 | platform_get_device_id(pdev)->driver_data; |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 597 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 598 | /* Setup i2c_imx driver structure */ |
Wolfram Sang | 973c5ed | 2012-04-19 17:31:01 +0200 | [diff] [blame] | 599 | strlcpy(i2c_imx->adapter.name, pdev->name, sizeof(i2c_imx->adapter.name)); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 600 | i2c_imx->adapter.owner = THIS_MODULE; |
| 601 | i2c_imx->adapter.algo = &i2c_imx_algo; |
| 602 | i2c_imx->adapter.dev.parent = &pdev->dev; |
| 603 | i2c_imx->adapter.nr = pdev->id; |
Shawn Guo | dfcd04b | 2011-09-08 15:09:35 +0800 | [diff] [blame] | 604 | i2c_imx->adapter.dev.of_node = pdev->dev.of_node; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 605 | i2c_imx->base = base; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 606 | |
| 607 | /* Get I2C clock */ |
Fabio Estevam | 1f09c67 | 2012-07-06 15:31:32 -0300 | [diff] [blame] | 608 | i2c_imx->clk = devm_clk_get(&pdev->dev, NULL); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 609 | if (IS_ERR(i2c_imx->clk)) { |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 610 | dev_err(&pdev->dev, "can't get I2C clock\n"); |
Richard Zhao | 9f8a3e7 | 2012-06-04 19:04:25 +0800 | [diff] [blame] | 611 | return PTR_ERR(i2c_imx->clk); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 612 | } |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 613 | |
Jingchang Lu | 46f2832 | 2013-08-07 17:05:37 +0800 | [diff] [blame] | 614 | ret = clk_prepare_enable(i2c_imx->clk); |
| 615 | if (ret) { |
| 616 | dev_err(&pdev->dev, "can't enable I2C clock\n"); |
| 617 | return ret; |
| 618 | } |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 619 | /* Request IRQ */ |
Richard Zhao | 9f8a3e7 | 2012-06-04 19:04:25 +0800 | [diff] [blame] | 620 | ret = devm_request_irq(&pdev->dev, irq, i2c_imx_isr, 0, |
| 621 | pdev->name, i2c_imx); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 622 | if (ret) { |
Richard Zhao | 9f8a3e7 | 2012-06-04 19:04:25 +0800 | [diff] [blame] | 623 | dev_err(&pdev->dev, "can't claim irq %d\n", irq); |
| 624 | return ret; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 625 | } |
| 626 | |
| 627 | /* Init queue */ |
| 628 | init_waitqueue_head(&i2c_imx->queue); |
| 629 | |
| 630 | /* Set up adapter data */ |
| 631 | i2c_set_adapdata(&i2c_imx->adapter, i2c_imx); |
| 632 | |
| 633 | /* Set up clock divider */ |
Shawn Guo | dfcd04b | 2011-09-08 15:09:35 +0800 | [diff] [blame] | 634 | bitrate = IMX_I2C_BIT_RATE; |
| 635 | ret = of_property_read_u32(pdev->dev.of_node, |
| 636 | "clock-frequency", &bitrate); |
| 637 | if (ret < 0 && pdata && pdata->bitrate) |
| 638 | bitrate = pdata->bitrate; |
| 639 | i2c_imx_set_clk(i2c_imx, bitrate); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 640 | |
| 641 | /* Set up chip registers to defaults */ |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame^] | 642 | imx_i2c_write_reg(i2c_imx->hwdata->i2cr_ien_opcode ^ I2CR_IEN, |
| 643 | i2c_imx, IMX_I2C_I2CR); |
| 644 | 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] | 645 | |
| 646 | /* Add I2C adapter */ |
| 647 | ret = i2c_add_numbered_adapter(&i2c_imx->adapter); |
| 648 | if (ret < 0) { |
| 649 | dev_err(&pdev->dev, "registration failed\n"); |
Richard Zhao | 9f8a3e7 | 2012-06-04 19:04:25 +0800 | [diff] [blame] | 650 | return ret; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 651 | } |
| 652 | |
Shawn Guo | dfcd04b | 2011-09-08 15:09:35 +0800 | [diff] [blame] | 653 | of_i2c_register_devices(&i2c_imx->adapter); |
| 654 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 655 | /* Set up platform driver data */ |
| 656 | platform_set_drvdata(pdev, i2c_imx); |
Jingchang Lu | 46f2832 | 2013-08-07 17:05:37 +0800 | [diff] [blame] | 657 | clk_disable_unprepare(i2c_imx->clk); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 658 | |
Richard Zhao | 9f8a3e7 | 2012-06-04 19:04:25 +0800 | [diff] [blame] | 659 | dev_dbg(&i2c_imx->adapter.dev, "claimed irq %d\n", irq); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 660 | 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] | 661 | res->start, res->end); |
| 662 | dev_dbg(&i2c_imx->adapter.dev, "allocated %d bytes at 0x%x\n", |
| 663 | resource_size(res), res->start); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 664 | dev_dbg(&i2c_imx->adapter.dev, "adapter name: \"%s\"\n", |
| 665 | i2c_imx->adapter.name); |
Fabio Estevam | 06d141e | 2012-08-01 17:38:14 -0300 | [diff] [blame] | 666 | dev_info(&i2c_imx->adapter.dev, "IMX I2C adapter registered\n"); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 667 | |
| 668 | return 0; /* Return OK */ |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 669 | } |
| 670 | |
| 671 | static int __exit i2c_imx_remove(struct platform_device *pdev) |
| 672 | { |
| 673 | struct imx_i2c_struct *i2c_imx = platform_get_drvdata(pdev); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 674 | |
| 675 | /* remove adapter */ |
| 676 | dev_dbg(&i2c_imx->adapter.dev, "adapter removed\n"); |
| 677 | i2c_del_adapter(&i2c_imx->adapter); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 678 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 679 | /* setup chip registers to defaults */ |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 680 | imx_i2c_write_reg(0, i2c_imx, IMX_I2C_IADR); |
| 681 | imx_i2c_write_reg(0, i2c_imx, IMX_I2C_IFDR); |
| 682 | imx_i2c_write_reg(0, i2c_imx, IMX_I2C_I2CR); |
| 683 | imx_i2c_write_reg(0, i2c_imx, IMX_I2C_I2SR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 684 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 685 | return 0; |
| 686 | } |
| 687 | |
| 688 | static struct platform_driver i2c_imx_driver = { |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 689 | .remove = __exit_p(i2c_imx_remove), |
| 690 | .driver = { |
| 691 | .name = DRIVER_NAME, |
| 692 | .owner = THIS_MODULE, |
Shawn Guo | dfcd04b | 2011-09-08 15:09:35 +0800 | [diff] [blame] | 693 | .of_match_table = i2c_imx_dt_ids, |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 694 | }, |
| 695 | .id_table = imx_i2c_devtype, |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 696 | }; |
| 697 | |
| 698 | static int __init i2c_adap_imx_init(void) |
| 699 | { |
| 700 | return platform_driver_probe(&i2c_imx_driver, i2c_imx_probe); |
| 701 | } |
Wolfram Sang | 5d3f333 | 2009-09-19 09:09:50 +0200 | [diff] [blame] | 702 | subsys_initcall(i2c_adap_imx_init); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 703 | |
| 704 | static void __exit i2c_adap_imx_exit(void) |
| 705 | { |
| 706 | platform_driver_unregister(&i2c_imx_driver); |
| 707 | } |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 708 | module_exit(i2c_adap_imx_exit); |
| 709 | |
| 710 | MODULE_LICENSE("GPL"); |
| 711 | MODULE_AUTHOR("Darius Augulis"); |
| 712 | MODULE_DESCRIPTION("I2C adapter driver for IMX I2C bus"); |
| 713 | MODULE_ALIAS("platform:" DRIVER_NAME); |