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 | * |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 14 | * Author: |
| 15 | * Darius Augulis, Teltonika Inc. |
| 16 | * |
| 17 | * Desc.: |
| 18 | * Implementation of I2C Adapter/Algorithm Driver |
| 19 | * for I2C Bus integrated in Freescale i.MX/MXC processors |
| 20 | * |
| 21 | * Derived from Motorola GSG China I2C example driver |
| 22 | * |
| 23 | * Copyright (C) 2005 Torsten Koschorrek <koschorrek at synertronixx.de |
| 24 | * Copyright (C) 2005 Matthias Blaschke <blaschke at synertronixx.de |
| 25 | * Copyright (C) 2007 RightHand Technologies, Inc. |
| 26 | * Copyright (C) 2008 Darius Augulis <darius.augulis at teltonika.lt> |
| 27 | * |
Jingchang Lu | d533f04 | 2013-08-07 17:05:36 +0800 | [diff] [blame] | 28 | * Copyright 2013 Freescale Semiconductor, Inc. |
| 29 | * |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 30 | */ |
| 31 | |
Yao Yuan | 2fbed51 | 2014-11-18 18:31:05 +0800 | [diff] [blame] | 32 | #include <linux/clk.h> |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 33 | #include <linux/completion.h> |
Yao Yuan | 2fbed51 | 2014-11-18 18:31:05 +0800 | [diff] [blame] | 34 | #include <linux/delay.h> |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 35 | #include <linux/dma-mapping.h> |
| 36 | #include <linux/dmaengine.h> |
| 37 | #include <linux/dmapool.h> |
Yao Yuan | 2fbed51 | 2014-11-18 18:31:05 +0800 | [diff] [blame] | 38 | #include <linux/err.h> |
| 39 | #include <linux/errno.h> |
| 40 | #include <linux/i2c.h> |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 41 | #include <linux/init.h> |
Yao Yuan | 2fbed51 | 2014-11-18 18:31:05 +0800 | [diff] [blame] | 42 | #include <linux/interrupt.h> |
| 43 | #include <linux/io.h> |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 44 | #include <linux/kernel.h> |
| 45 | #include <linux/module.h> |
Shawn Guo | dfcd04b | 2011-09-08 15:09:35 +0800 | [diff] [blame] | 46 | #include <linux/of.h> |
| 47 | #include <linux/of_device.h> |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 48 | #include <linux/of_dma.h> |
Gao Pan | 1c4b6c3 | 2015-10-23 20:28:54 +0800 | [diff] [blame] | 49 | #include <linux/of_gpio.h> |
Hou Zhiqiang | 8bb6fd5 | 2015-11-17 17:53:18 +0800 | [diff] [blame] | 50 | #include <linux/pinctrl/consumer.h> |
Arnd Bergmann | 82906b1 | 2012-08-24 15:14:29 +0200 | [diff] [blame] | 51 | #include <linux/platform_data/i2c-imx.h> |
Yao Yuan | 2fbed51 | 2014-11-18 18:31:05 +0800 | [diff] [blame] | 52 | #include <linux/platform_device.h> |
Gao Pan | 588eb93 | 2015-12-11 10:24:09 +0800 | [diff] [blame] | 53 | #include <linux/pm_runtime.h> |
Yao Yuan | 2fbed51 | 2014-11-18 18:31:05 +0800 | [diff] [blame] | 54 | #include <linux/sched.h> |
| 55 | #include <linux/slab.h> |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 56 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 57 | /* This will be the driver name the kernel reports */ |
| 58 | #define DRIVER_NAME "imx-i2c" |
| 59 | |
| 60 | /* Default value */ |
| 61 | #define IMX_I2C_BIT_RATE 100000 /* 100kHz */ |
| 62 | |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 63 | /* |
| 64 | * Enable DMA if transfer byte size is bigger than this threshold. |
| 65 | * As the hardware request, it must bigger than 4 bytes.\ |
| 66 | * I have set '16' here, maybe it's not the best but I think it's |
| 67 | * the appropriate. |
| 68 | */ |
| 69 | #define DMA_THRESHOLD 16 |
| 70 | #define DMA_TIMEOUT 1000 |
| 71 | |
Jingchang Lu | 8cc7331 | 2013-08-07 17:05:40 +0800 | [diff] [blame] | 72 | /* IMX I2C registers: |
| 73 | * the I2C register offset is different between SoCs, |
| 74 | * to provid support for all these chips, split the |
| 75 | * register offset into a fixed base address and a |
| 76 | * variable shift value, then the full register offset |
| 77 | * will be calculated by |
| 78 | * reg_off = ( reg_base_addr << reg_shift) |
| 79 | */ |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 80 | #define IMX_I2C_IADR 0x00 /* i2c slave address */ |
Jingchang Lu | 8cc7331 | 2013-08-07 17:05:40 +0800 | [diff] [blame] | 81 | #define IMX_I2C_IFDR 0x01 /* i2c frequency divider */ |
| 82 | #define IMX_I2C_I2CR 0x02 /* i2c control */ |
| 83 | #define IMX_I2C_I2SR 0x03 /* i2c status */ |
| 84 | #define IMX_I2C_I2DR 0x04 /* i2c transfer data */ |
| 85 | |
| 86 | #define IMX_I2C_REGSHIFT 2 |
Jingchang Lu | ad90efa | 2013-08-07 17:05:43 +0800 | [diff] [blame] | 87 | #define VF610_I2C_REGSHIFT 0 |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 88 | |
| 89 | /* Bits of IMX I2C registers */ |
| 90 | #define I2SR_RXAK 0x01 |
| 91 | #define I2SR_IIF 0x02 |
| 92 | #define I2SR_SRW 0x04 |
| 93 | #define I2SR_IAL 0x10 |
| 94 | #define I2SR_IBB 0x20 |
| 95 | #define I2SR_IAAS 0x40 |
| 96 | #define I2SR_ICF 0x80 |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 97 | #define I2CR_DMAEN 0x02 |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 98 | #define I2CR_RSTA 0x04 |
| 99 | #define I2CR_TXAK 0x08 |
| 100 | #define I2CR_MTX 0x10 |
| 101 | #define I2CR_MSTA 0x20 |
| 102 | #define I2CR_IIEN 0x40 |
| 103 | #define I2CR_IEN 0x80 |
| 104 | |
Jingchang Lu | 171408c | 2013-08-07 17:05:41 +0800 | [diff] [blame] | 105 | /* register bits different operating codes definition: |
| 106 | * 1) I2SR: Interrupt flags clear operation differ between SoCs: |
| 107 | * - write zero to clear(w0c) INT flag on i.MX, |
| 108 | * - but write one to clear(w1c) INT flag on Vybrid. |
| 109 | * 2) I2CR: I2C module enable operation also differ between SoCs: |
| 110 | * - set I2CR_IEN bit enable the module on i.MX, |
| 111 | * - but clear I2CR_IEN bit enable the module on Vybrid. |
| 112 | */ |
| 113 | #define I2SR_CLR_OPCODE_W0C 0x0 |
| 114 | #define I2SR_CLR_OPCODE_W1C (I2SR_IAL | I2SR_IIF) |
| 115 | #define I2CR_IEN_OPCODE_0 0x0 |
| 116 | #define I2CR_IEN_OPCODE_1 I2CR_IEN |
| 117 | |
Gao Pan | 588eb93 | 2015-12-11 10:24:09 +0800 | [diff] [blame] | 118 | #define I2C_PM_TIMEOUT 10 /* ms */ |
| 119 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 120 | /* |
| 121 | * sorted list of clock divider, register value pairs |
| 122 | * taken from table 26-5, p.26-9, Freescale i.MX |
| 123 | * Integrated Portable System Processor Reference Manual |
| 124 | * Document Number: MC9328MXLRM, Rev. 5.1, 06/2007 |
| 125 | * |
| 126 | * Duplicated divider values removed from list |
| 127 | */ |
Jingchang Lu | d533f04 | 2013-08-07 17:05:36 +0800 | [diff] [blame] | 128 | struct imx_i2c_clk_pair { |
| 129 | u16 div; |
| 130 | u16 val; |
| 131 | }; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 132 | |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 133 | static struct imx_i2c_clk_pair imx_i2c_clk_div[] = { |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 134 | { 22, 0x20 }, { 24, 0x21 }, { 26, 0x22 }, { 28, 0x23 }, |
| 135 | { 30, 0x00 }, { 32, 0x24 }, { 36, 0x25 }, { 40, 0x26 }, |
| 136 | { 42, 0x03 }, { 44, 0x27 }, { 48, 0x28 }, { 52, 0x05 }, |
| 137 | { 56, 0x29 }, { 60, 0x06 }, { 64, 0x2A }, { 72, 0x2B }, |
| 138 | { 80, 0x2C }, { 88, 0x09 }, { 96, 0x2D }, { 104, 0x0A }, |
| 139 | { 112, 0x2E }, { 128, 0x2F }, { 144, 0x0C }, { 160, 0x30 }, |
| 140 | { 192, 0x31 }, { 224, 0x32 }, { 240, 0x0F }, { 256, 0x33 }, |
| 141 | { 288, 0x10 }, { 320, 0x34 }, { 384, 0x35 }, { 448, 0x36 }, |
| 142 | { 480, 0x13 }, { 512, 0x37 }, { 576, 0x14 }, { 640, 0x38 }, |
| 143 | { 768, 0x39 }, { 896, 0x3A }, { 960, 0x17 }, { 1024, 0x3B }, |
| 144 | { 1152, 0x18 }, { 1280, 0x3C }, { 1536, 0x3D }, { 1792, 0x3E }, |
| 145 | { 1920, 0x1B }, { 2048, 0x3F }, { 2304, 0x1C }, { 2560, 0x1D }, |
| 146 | { 3072, 0x1E }, { 3840, 0x1F } |
| 147 | }; |
| 148 | |
Jingchang Lu | ad90efa | 2013-08-07 17:05:43 +0800 | [diff] [blame] | 149 | /* Vybrid VF610 clock divider, register value pairs */ |
| 150 | static struct imx_i2c_clk_pair vf610_i2c_clk_div[] = { |
| 151 | { 20, 0x00 }, { 22, 0x01 }, { 24, 0x02 }, { 26, 0x03 }, |
| 152 | { 28, 0x04 }, { 30, 0x05 }, { 32, 0x09 }, { 34, 0x06 }, |
| 153 | { 36, 0x0A }, { 40, 0x07 }, { 44, 0x0C }, { 48, 0x0D }, |
| 154 | { 52, 0x43 }, { 56, 0x0E }, { 60, 0x45 }, { 64, 0x12 }, |
| 155 | { 68, 0x0F }, { 72, 0x13 }, { 80, 0x14 }, { 88, 0x15 }, |
| 156 | { 96, 0x19 }, { 104, 0x16 }, { 112, 0x1A }, { 128, 0x17 }, |
| 157 | { 136, 0x4F }, { 144, 0x1C }, { 160, 0x1D }, { 176, 0x55 }, |
| 158 | { 192, 0x1E }, { 208, 0x56 }, { 224, 0x22 }, { 228, 0x24 }, |
| 159 | { 240, 0x1F }, { 256, 0x23 }, { 288, 0x5C }, { 320, 0x25 }, |
| 160 | { 384, 0x26 }, { 448, 0x2A }, { 480, 0x27 }, { 512, 0x2B }, |
| 161 | { 576, 0x2C }, { 640, 0x2D }, { 768, 0x31 }, { 896, 0x32 }, |
| 162 | { 960, 0x2F }, { 1024, 0x33 }, { 1152, 0x34 }, { 1280, 0x35 }, |
| 163 | { 1536, 0x36 }, { 1792, 0x3A }, { 1920, 0x37 }, { 2048, 0x3B }, |
| 164 | { 2304, 0x3C }, { 2560, 0x3D }, { 3072, 0x3E }, { 3584, 0x7A }, |
| 165 | { 3840, 0x3F }, { 4096, 0x7B }, { 5120, 0x7D }, { 6144, 0x7E }, |
| 166 | }; |
| 167 | |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 168 | enum imx_i2c_type { |
| 169 | IMX1_I2C, |
| 170 | IMX21_I2C, |
Jingchang Lu | ad90efa | 2013-08-07 17:05:43 +0800 | [diff] [blame] | 171 | VF610_I2C, |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 172 | }; |
| 173 | |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 174 | struct imx_i2c_hwdata { |
| 175 | enum imx_i2c_type devtype; |
| 176 | unsigned regshift; |
| 177 | struct imx_i2c_clk_pair *clk_div; |
| 178 | unsigned ndivs; |
| 179 | unsigned i2sr_clr_opcode; |
| 180 | unsigned i2cr_ien_opcode; |
| 181 | }; |
| 182 | |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 183 | struct imx_i2c_dma { |
| 184 | struct dma_chan *chan_tx; |
| 185 | struct dma_chan *chan_rx; |
| 186 | struct dma_chan *chan_using; |
| 187 | struct completion cmd_complete; |
| 188 | dma_addr_t dma_buf; |
| 189 | unsigned int dma_len; |
| 190 | enum dma_transfer_direction dma_transfer_dir; |
| 191 | enum dma_data_direction dma_data_dir; |
| 192 | }; |
| 193 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 194 | struct imx_i2c_struct { |
| 195 | struct i2c_adapter adapter; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 196 | struct clk *clk; |
| 197 | void __iomem *base; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 198 | wait_queue_head_t queue; |
| 199 | unsigned long i2csr; |
Philipp Zabel | 4e355f5 | 2015-01-22 16:17:29 +0100 | [diff] [blame] | 200 | unsigned int disable_delay; |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 201 | int stopped; |
Richard Zhao | db3a3d4 | 2009-10-17 17:46:24 +0800 | [diff] [blame] | 202 | unsigned int ifdr; /* IMX_I2C_IFDR */ |
Fugang Duan | 9b2a6da | 2014-05-20 10:21:45 +0800 | [diff] [blame] | 203 | unsigned int cur_clk; |
| 204 | unsigned int bitrate; |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 205 | const struct imx_i2c_hwdata *hwdata; |
Gao Pan | 1c4b6c3 | 2015-10-23 20:28:54 +0800 | [diff] [blame] | 206 | struct i2c_bus_recovery_info rinfo; |
| 207 | |
| 208 | struct pinctrl *pinctrl; |
| 209 | struct pinctrl_state *pinctrl_pins_default; |
| 210 | struct pinctrl_state *pinctrl_pins_gpio; |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 211 | |
| 212 | struct imx_i2c_dma *dma; |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 213 | }; |
| 214 | |
Dmitriy Baranov | 3bf58bb | 2016-01-25 15:48:32 +0300 | [diff] [blame] | 215 | static const struct imx_i2c_hwdata imx1_i2c_hwdata = { |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 216 | .devtype = IMX1_I2C, |
| 217 | .regshift = IMX_I2C_REGSHIFT, |
| 218 | .clk_div = imx_i2c_clk_div, |
| 219 | .ndivs = ARRAY_SIZE(imx_i2c_clk_div), |
| 220 | .i2sr_clr_opcode = I2SR_CLR_OPCODE_W0C, |
| 221 | .i2cr_ien_opcode = I2CR_IEN_OPCODE_1, |
| 222 | |
| 223 | }; |
| 224 | |
Dmitriy Baranov | 3bf58bb | 2016-01-25 15:48:32 +0300 | [diff] [blame] | 225 | static const struct imx_i2c_hwdata imx21_i2c_hwdata = { |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 226 | .devtype = IMX21_I2C, |
| 227 | .regshift = IMX_I2C_REGSHIFT, |
| 228 | .clk_div = imx_i2c_clk_div, |
| 229 | .ndivs = ARRAY_SIZE(imx_i2c_clk_div), |
| 230 | .i2sr_clr_opcode = I2SR_CLR_OPCODE_W0C, |
| 231 | .i2cr_ien_opcode = I2CR_IEN_OPCODE_1, |
| 232 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 233 | }; |
| 234 | |
Jingchang Lu | ad90efa | 2013-08-07 17:05:43 +0800 | [diff] [blame] | 235 | static struct imx_i2c_hwdata vf610_i2c_hwdata = { |
| 236 | .devtype = VF610_I2C, |
| 237 | .regshift = VF610_I2C_REGSHIFT, |
| 238 | .clk_div = vf610_i2c_clk_div, |
| 239 | .ndivs = ARRAY_SIZE(vf610_i2c_clk_div), |
| 240 | .i2sr_clr_opcode = I2SR_CLR_OPCODE_W1C, |
| 241 | .i2cr_ien_opcode = I2CR_IEN_OPCODE_0, |
| 242 | |
| 243 | }; |
| 244 | |
Krzysztof Kozlowski | e9a02a3 | 2015-05-02 00:54:25 +0900 | [diff] [blame] | 245 | static const struct platform_device_id imx_i2c_devtype[] = { |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 246 | { |
| 247 | .name = "imx1-i2c", |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 248 | .driver_data = (kernel_ulong_t)&imx1_i2c_hwdata, |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 249 | }, { |
| 250 | .name = "imx21-i2c", |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 251 | .driver_data = (kernel_ulong_t)&imx21_i2c_hwdata, |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 252 | }, { |
| 253 | /* sentinel */ |
| 254 | } |
| 255 | }; |
| 256 | MODULE_DEVICE_TABLE(platform, imx_i2c_devtype); |
| 257 | |
Shawn Guo | dfcd04b | 2011-09-08 15:09:35 +0800 | [diff] [blame] | 258 | static const struct of_device_id i2c_imx_dt_ids[] = { |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 259 | { .compatible = "fsl,imx1-i2c", .data = &imx1_i2c_hwdata, }, |
| 260 | { .compatible = "fsl,imx21-i2c", .data = &imx21_i2c_hwdata, }, |
Jingchang Lu | ad90efa | 2013-08-07 17:05:43 +0800 | [diff] [blame] | 261 | { .compatible = "fsl,vf610-i2c", .data = &vf610_i2c_hwdata, }, |
Shawn Guo | dfcd04b | 2011-09-08 15:09:35 +0800 | [diff] [blame] | 262 | { /* sentinel */ } |
| 263 | }; |
Arnaud Patard \(Rtp\) | 2f641a8 | 2013-06-20 23:07:06 +0200 | [diff] [blame] | 264 | MODULE_DEVICE_TABLE(of, i2c_imx_dt_ids); |
Shawn Guo | dfcd04b | 2011-09-08 15:09:35 +0800 | [diff] [blame] | 265 | |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 266 | static inline int is_imx1_i2c(struct imx_i2c_struct *i2c_imx) |
| 267 | { |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 268 | return i2c_imx->hwdata->devtype == IMX1_I2C; |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 269 | } |
| 270 | |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 271 | static inline void imx_i2c_write_reg(unsigned int val, |
| 272 | struct imx_i2c_struct *i2c_imx, unsigned int reg) |
| 273 | { |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 274 | writeb(val, i2c_imx->base + (reg << i2c_imx->hwdata->regshift)); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 275 | } |
| 276 | |
| 277 | static inline unsigned char imx_i2c_read_reg(struct imx_i2c_struct *i2c_imx, |
| 278 | unsigned int reg) |
| 279 | { |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 280 | return readb(i2c_imx->base + (reg << i2c_imx->hwdata->regshift)); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 281 | } |
| 282 | |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 283 | /* Functions for DMA support */ |
| 284 | static void i2c_imx_dma_request(struct imx_i2c_struct *i2c_imx, |
| 285 | dma_addr_t phy_addr) |
| 286 | { |
| 287 | struct imx_i2c_dma *dma; |
| 288 | struct dma_slave_config dma_sconfig; |
| 289 | struct device *dev = &i2c_imx->adapter.dev; |
| 290 | int ret; |
| 291 | |
| 292 | dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL); |
| 293 | if (!dma) |
| 294 | return; |
| 295 | |
| 296 | dma->chan_tx = dma_request_slave_channel(dev, "tx"); |
| 297 | if (!dma->chan_tx) { |
| 298 | dev_dbg(dev, "can't request DMA tx channel\n"); |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 299 | goto fail_al; |
| 300 | } |
| 301 | |
| 302 | dma_sconfig.dst_addr = phy_addr + |
| 303 | (IMX_I2C_I2DR << i2c_imx->hwdata->regshift); |
| 304 | dma_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; |
| 305 | dma_sconfig.dst_maxburst = 1; |
| 306 | dma_sconfig.direction = DMA_MEM_TO_DEV; |
| 307 | ret = dmaengine_slave_config(dma->chan_tx, &dma_sconfig); |
| 308 | if (ret < 0) { |
| 309 | dev_dbg(dev, "can't configure tx channel\n"); |
| 310 | goto fail_tx; |
| 311 | } |
| 312 | |
| 313 | dma->chan_rx = dma_request_slave_channel(dev, "rx"); |
| 314 | if (!dma->chan_rx) { |
| 315 | dev_dbg(dev, "can't request DMA rx channel\n"); |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 316 | goto fail_tx; |
| 317 | } |
| 318 | |
| 319 | dma_sconfig.src_addr = phy_addr + |
| 320 | (IMX_I2C_I2DR << i2c_imx->hwdata->regshift); |
| 321 | dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; |
| 322 | dma_sconfig.src_maxburst = 1; |
| 323 | dma_sconfig.direction = DMA_DEV_TO_MEM; |
| 324 | ret = dmaengine_slave_config(dma->chan_rx, &dma_sconfig); |
| 325 | if (ret < 0) { |
| 326 | dev_dbg(dev, "can't configure rx channel\n"); |
| 327 | goto fail_rx; |
| 328 | } |
| 329 | |
| 330 | i2c_imx->dma = dma; |
| 331 | init_completion(&dma->cmd_complete); |
| 332 | dev_info(dev, "using %s (tx) and %s (rx) for DMA transfers\n", |
| 333 | dma_chan_name(dma->chan_tx), dma_chan_name(dma->chan_rx)); |
| 334 | |
| 335 | return; |
| 336 | |
| 337 | fail_rx: |
| 338 | dma_release_channel(dma->chan_rx); |
| 339 | fail_tx: |
| 340 | dma_release_channel(dma->chan_tx); |
| 341 | fail_al: |
| 342 | devm_kfree(dev, dma); |
Fabio Estevam | 5b66153 | 2015-11-01 14:22:51 -0200 | [diff] [blame] | 343 | dev_info(dev, "can't use DMA, using PIO instead.\n"); |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 344 | } |
| 345 | |
| 346 | static void i2c_imx_dma_callback(void *arg) |
| 347 | { |
| 348 | struct imx_i2c_struct *i2c_imx = (struct imx_i2c_struct *)arg; |
| 349 | struct imx_i2c_dma *dma = i2c_imx->dma; |
| 350 | |
| 351 | dma_unmap_single(dma->chan_using->device->dev, dma->dma_buf, |
| 352 | dma->dma_len, dma->dma_data_dir); |
| 353 | complete(&dma->cmd_complete); |
| 354 | } |
| 355 | |
| 356 | static int i2c_imx_dma_xfer(struct imx_i2c_struct *i2c_imx, |
| 357 | struct i2c_msg *msgs) |
| 358 | { |
| 359 | struct imx_i2c_dma *dma = i2c_imx->dma; |
| 360 | struct dma_async_tx_descriptor *txdesc; |
| 361 | struct device *dev = &i2c_imx->adapter.dev; |
| 362 | struct device *chan_dev = dma->chan_using->device->dev; |
| 363 | |
| 364 | dma->dma_buf = dma_map_single(chan_dev, msgs->buf, |
| 365 | dma->dma_len, dma->dma_data_dir); |
| 366 | if (dma_mapping_error(chan_dev, dma->dma_buf)) { |
| 367 | dev_err(dev, "DMA mapping failed\n"); |
| 368 | goto err_map; |
| 369 | } |
| 370 | |
| 371 | txdesc = dmaengine_prep_slave_single(dma->chan_using, dma->dma_buf, |
| 372 | dma->dma_len, dma->dma_transfer_dir, |
| 373 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
| 374 | if (!txdesc) { |
| 375 | dev_err(dev, "Not able to get desc for DMA xfer\n"); |
| 376 | goto err_desc; |
| 377 | } |
| 378 | |
| 379 | txdesc->callback = i2c_imx_dma_callback; |
| 380 | txdesc->callback_param = i2c_imx; |
| 381 | if (dma_submit_error(dmaengine_submit(txdesc))) { |
| 382 | dev_err(dev, "DMA submit failed\n"); |
| 383 | goto err_submit; |
| 384 | } |
| 385 | |
| 386 | dma_async_issue_pending(dma->chan_using); |
| 387 | return 0; |
| 388 | |
| 389 | err_submit: |
Gao Pan | c552815 | 2016-01-08 13:33:15 +0800 | [diff] [blame] | 390 | dmaengine_terminate_all(dma->chan_using); |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 391 | err_desc: |
| 392 | dma_unmap_single(chan_dev, dma->dma_buf, |
| 393 | dma->dma_len, dma->dma_data_dir); |
| 394 | err_map: |
| 395 | return -EINVAL; |
| 396 | } |
| 397 | |
| 398 | static void i2c_imx_dma_free(struct imx_i2c_struct *i2c_imx) |
| 399 | { |
| 400 | struct imx_i2c_dma *dma = i2c_imx->dma; |
| 401 | |
| 402 | dma->dma_buf = 0; |
| 403 | dma->dma_len = 0; |
| 404 | |
| 405 | dma_release_channel(dma->chan_tx); |
| 406 | dma->chan_tx = NULL; |
| 407 | |
| 408 | dma_release_channel(dma->chan_rx); |
| 409 | dma->chan_rx = NULL; |
| 410 | |
| 411 | dma->chan_using = NULL; |
| 412 | } |
| 413 | |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 414 | 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] | 415 | { |
| 416 | unsigned long orig_jiffies = jiffies; |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 417 | unsigned int temp; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 418 | |
| 419 | dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__); |
| 420 | |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 421 | while (1) { |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 422 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR); |
Haibo Chen | 639a26c | 2014-09-03 13:52:07 +0800 | [diff] [blame] | 423 | |
| 424 | /* check for arbitration lost */ |
| 425 | if (temp & I2SR_IAL) { |
| 426 | temp &= ~I2SR_IAL; |
| 427 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2SR); |
| 428 | return -EAGAIN; |
| 429 | } |
| 430 | |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 431 | if (for_busy && (temp & I2SR_IBB)) |
| 432 | break; |
| 433 | if (!for_busy && !(temp & I2SR_IBB)) |
| 434 | break; |
Arnaud Patard | da9c99f | 2010-03-23 17:28:28 +0100 | [diff] [blame] | 435 | if (time_after(jiffies, orig_jiffies + msecs_to_jiffies(500))) { |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 436 | dev_dbg(&i2c_imx->adapter.dev, |
| 437 | "<%s> I2C bus is busy\n", __func__); |
Arnaud Patard | da9c99f | 2010-03-23 17:28:28 +0100 | [diff] [blame] | 438 | return -ETIMEDOUT; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 439 | } |
| 440 | schedule(); |
| 441 | } |
| 442 | |
| 443 | return 0; |
| 444 | } |
| 445 | |
| 446 | static int i2c_imx_trx_complete(struct imx_i2c_struct *i2c_imx) |
| 447 | { |
Marc Kleine-Budde | e39428d | 2010-06-21 09:27:05 +0200 | [diff] [blame] | 448 | 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] | 449 | |
Marc Kleine-Budde | e39428d | 2010-06-21 09:27:05 +0200 | [diff] [blame] | 450 | if (unlikely(!(i2c_imx->i2csr & I2SR_IIF))) { |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 451 | dev_dbg(&i2c_imx->adapter.dev, "<%s> Timeout\n", __func__); |
| 452 | return -ETIMEDOUT; |
| 453 | } |
| 454 | dev_dbg(&i2c_imx->adapter.dev, "<%s> TRX complete\n", __func__); |
| 455 | i2c_imx->i2csr = 0; |
| 456 | return 0; |
| 457 | } |
| 458 | |
| 459 | static int i2c_imx_acked(struct imx_i2c_struct *i2c_imx) |
| 460 | { |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 461 | if (imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR) & I2SR_RXAK) { |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 462 | dev_dbg(&i2c_imx->adapter.dev, "<%s> No ACK\n", __func__); |
Fabio Estevam | 4c0657a | 2015-10-22 14:41:20 -0200 | [diff] [blame] | 463 | return -ENXIO; /* No ACK */ |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 464 | } |
| 465 | |
| 466 | dev_dbg(&i2c_imx->adapter.dev, "<%s> ACK received\n", __func__); |
| 467 | return 0; |
| 468 | } |
| 469 | |
Fugang Duan | 9b2a6da | 2014-05-20 10:21:45 +0800 | [diff] [blame] | 470 | static void i2c_imx_set_clk(struct imx_i2c_struct *i2c_imx) |
| 471 | { |
| 472 | struct imx_i2c_clk_pair *i2c_clk_div = i2c_imx->hwdata->clk_div; |
| 473 | unsigned int i2c_clk_rate; |
| 474 | unsigned int div; |
| 475 | int i; |
| 476 | |
| 477 | /* Divider value calculation */ |
| 478 | i2c_clk_rate = clk_get_rate(i2c_imx->clk); |
| 479 | if (i2c_imx->cur_clk == i2c_clk_rate) |
| 480 | return; |
Philipp Zabel | 4e355f5 | 2015-01-22 16:17:29 +0100 | [diff] [blame] | 481 | |
| 482 | i2c_imx->cur_clk = i2c_clk_rate; |
Fugang Duan | 9b2a6da | 2014-05-20 10:21:45 +0800 | [diff] [blame] | 483 | |
| 484 | div = (i2c_clk_rate + i2c_imx->bitrate - 1) / i2c_imx->bitrate; |
| 485 | if (div < i2c_clk_div[0].div) |
| 486 | i = 0; |
| 487 | else if (div > i2c_clk_div[i2c_imx->hwdata->ndivs - 1].div) |
| 488 | i = i2c_imx->hwdata->ndivs - 1; |
| 489 | else |
Philipp Zabel | 4e355f5 | 2015-01-22 16:17:29 +0100 | [diff] [blame] | 490 | for (i = 0; i2c_clk_div[i].div < div; i++) |
| 491 | ; |
Fugang Duan | 9b2a6da | 2014-05-20 10:21:45 +0800 | [diff] [blame] | 492 | |
| 493 | /* Store divider value */ |
| 494 | i2c_imx->ifdr = i2c_clk_div[i].val; |
| 495 | |
| 496 | /* |
| 497 | * There dummy delay is calculated. |
| 498 | * It should be about one I2C clock period long. |
| 499 | * This delay is used in I2C bus disable function |
| 500 | * to fix chip hardware bug. |
| 501 | */ |
| 502 | i2c_imx->disable_delay = (500000U * i2c_clk_div[i].div |
| 503 | + (i2c_clk_rate / 2) - 1) / (i2c_clk_rate / 2); |
| 504 | |
| 505 | #ifdef CONFIG_I2C_DEBUG_BUS |
| 506 | dev_dbg(&i2c_imx->adapter.dev, "I2C_CLK=%d, REQ DIV=%d\n", |
| 507 | i2c_clk_rate, div); |
| 508 | dev_dbg(&i2c_imx->adapter.dev, "IFDR[IC]=0x%x, REAL DIV=%d\n", |
| 509 | i2c_clk_div[i].val, i2c_clk_div[i].div); |
| 510 | #endif |
| 511 | } |
| 512 | |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 513 | static int i2c_imx_start(struct imx_i2c_struct *i2c_imx) |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 514 | { |
| 515 | unsigned int temp = 0; |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 516 | int result; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 517 | |
| 518 | dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__); |
| 519 | |
Fugang Duan | 9b2a6da | 2014-05-20 10:21:45 +0800 | [diff] [blame] | 520 | i2c_imx_set_clk(i2c_imx); |
| 521 | |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 522 | imx_i2c_write_reg(i2c_imx->ifdr, i2c_imx, IMX_I2C_IFDR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 523 | /* Enable I2C controller */ |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 524 | imx_i2c_write_reg(i2c_imx->hwdata->i2sr_clr_opcode, i2c_imx, IMX_I2C_I2SR); |
| 525 | 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] | 526 | |
| 527 | /* Wait controller to be stable */ |
Oleksij Rempel | 2b899f3 | 2016-04-26 08:27:46 +0200 | [diff] [blame] | 528 | usleep_range(50, 150); |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 529 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 530 | /* Start I2C transaction */ |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 531 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 532 | temp |= I2CR_MSTA; |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 533 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 534 | result = i2c_imx_bus_busy(i2c_imx, 1); |
| 535 | if (result) |
| 536 | return result; |
| 537 | i2c_imx->stopped = 0; |
| 538 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 539 | temp |= I2CR_IIEN | I2CR_MTX | I2CR_TXAK; |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 540 | temp &= ~I2CR_DMAEN; |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 541 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 542 | return result; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 543 | } |
| 544 | |
| 545 | static void i2c_imx_stop(struct imx_i2c_struct *i2c_imx) |
| 546 | { |
| 547 | unsigned int temp = 0; |
| 548 | |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 549 | if (!i2c_imx->stopped) { |
| 550 | /* Stop I2C transaction */ |
| 551 | dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 552 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 553 | temp &= ~(I2CR_MSTA | I2CR_MTX); |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 554 | if (i2c_imx->dma) |
| 555 | temp &= ~I2CR_DMAEN; |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 556 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 557 | } |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 558 | if (is_imx1_i2c(i2c_imx)) { |
Richard Zhao | a4094a7 | 2009-10-17 17:46:23 +0800 | [diff] [blame] | 559 | /* |
| 560 | * This delay caused by an i.MXL hardware bug. |
| 561 | * If no (or too short) delay, no "STOP" bit will be generated. |
| 562 | */ |
| 563 | udelay(i2c_imx->disable_delay); |
| 564 | } |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 565 | |
Valentin Longchamp | a1ee06b | 2010-01-21 18:55:32 +0100 | [diff] [blame] | 566 | if (!i2c_imx->stopped) { |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 567 | i2c_imx_bus_busy(i2c_imx, 0); |
Valentin Longchamp | a1ee06b | 2010-01-21 18:55:32 +0100 | [diff] [blame] | 568 | i2c_imx->stopped = 1; |
| 569 | } |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 570 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 571 | /* Disable I2C controller */ |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 572 | temp = i2c_imx->hwdata->i2cr_ien_opcode ^ I2CR_IEN, |
| 573 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 574 | } |
| 575 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 576 | static irqreturn_t i2c_imx_isr(int irq, void *dev_id) |
| 577 | { |
| 578 | struct imx_i2c_struct *i2c_imx = dev_id; |
| 579 | unsigned int temp; |
| 580 | |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 581 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 582 | if (temp & I2SR_IIF) { |
| 583 | /* save status register */ |
| 584 | i2c_imx->i2csr = temp; |
| 585 | temp &= ~I2SR_IIF; |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 586 | temp |= (i2c_imx->hwdata->i2sr_clr_opcode & I2SR_IIF); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 587 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2SR); |
Marc Kleine-Budde | e39428d | 2010-06-21 09:27:05 +0200 | [diff] [blame] | 588 | wake_up(&i2c_imx->queue); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 589 | return IRQ_HANDLED; |
| 590 | } |
| 591 | |
| 592 | return IRQ_NONE; |
| 593 | } |
| 594 | |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 595 | static int i2c_imx_dma_write(struct imx_i2c_struct *i2c_imx, |
| 596 | struct i2c_msg *msgs) |
| 597 | { |
| 598 | int result; |
Nicholas Mc Guire | 1ac63fe | 2015-02-08 06:39:56 -0500 | [diff] [blame] | 599 | unsigned long time_left; |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 600 | unsigned int temp = 0; |
| 601 | unsigned long orig_jiffies = jiffies; |
| 602 | struct imx_i2c_dma *dma = i2c_imx->dma; |
| 603 | struct device *dev = &i2c_imx->adapter.dev; |
| 604 | |
| 605 | dma->chan_using = dma->chan_tx; |
| 606 | dma->dma_transfer_dir = DMA_MEM_TO_DEV; |
| 607 | dma->dma_data_dir = DMA_TO_DEVICE; |
| 608 | dma->dma_len = msgs->len - 1; |
| 609 | result = i2c_imx_dma_xfer(i2c_imx, msgs); |
| 610 | if (result) |
| 611 | return result; |
| 612 | |
| 613 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
| 614 | temp |= I2CR_DMAEN; |
| 615 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
| 616 | |
| 617 | /* |
| 618 | * Write slave address. |
| 619 | * The first byte must be transmitted by the CPU. |
| 620 | */ |
| 621 | imx_i2c_write_reg(msgs->addr << 1, i2c_imx, IMX_I2C_I2DR); |
| 622 | reinit_completion(&i2c_imx->dma->cmd_complete); |
Nicholas Mc Guire | 1ac63fe | 2015-02-08 06:39:56 -0500 | [diff] [blame] | 623 | time_left = wait_for_completion_timeout( |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 624 | &i2c_imx->dma->cmd_complete, |
| 625 | msecs_to_jiffies(DMA_TIMEOUT)); |
Nicholas Mc Guire | 1ac63fe | 2015-02-08 06:39:56 -0500 | [diff] [blame] | 626 | if (time_left == 0) { |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 627 | dmaengine_terminate_all(dma->chan_using); |
Nicholas Mc Guire | cb9eaba | 2014-12-27 08:33:53 -0500 | [diff] [blame] | 628 | return -ETIMEDOUT; |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 629 | } |
| 630 | |
| 631 | /* Waiting for transfer complete. */ |
| 632 | while (1) { |
| 633 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR); |
| 634 | if (temp & I2SR_ICF) |
| 635 | break; |
| 636 | if (time_after(jiffies, orig_jiffies + |
| 637 | msecs_to_jiffies(DMA_TIMEOUT))) { |
| 638 | dev_dbg(dev, "<%s> Timeout\n", __func__); |
| 639 | return -ETIMEDOUT; |
| 640 | } |
| 641 | schedule(); |
| 642 | } |
| 643 | |
| 644 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
| 645 | temp &= ~I2CR_DMAEN; |
| 646 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
| 647 | |
| 648 | /* The last data byte must be transferred by the CPU. */ |
| 649 | imx_i2c_write_reg(msgs->buf[msgs->len-1], |
| 650 | i2c_imx, IMX_I2C_I2DR); |
| 651 | result = i2c_imx_trx_complete(i2c_imx); |
| 652 | if (result) |
| 653 | return result; |
| 654 | |
Wolfram Sang | f508493 | 2014-11-19 10:11:39 +0100 | [diff] [blame] | 655 | return i2c_imx_acked(i2c_imx); |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 656 | } |
| 657 | |
| 658 | static int i2c_imx_dma_read(struct imx_i2c_struct *i2c_imx, |
| 659 | struct i2c_msg *msgs, bool is_lastmsg) |
| 660 | { |
| 661 | int result; |
Nicholas Mc Guire | 1ac63fe | 2015-02-08 06:39:56 -0500 | [diff] [blame] | 662 | unsigned long time_left; |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 663 | unsigned int temp; |
| 664 | unsigned long orig_jiffies = jiffies; |
| 665 | struct imx_i2c_dma *dma = i2c_imx->dma; |
| 666 | struct device *dev = &i2c_imx->adapter.dev; |
| 667 | |
| 668 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
| 669 | temp |= I2CR_DMAEN; |
| 670 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
| 671 | |
| 672 | dma->chan_using = dma->chan_rx; |
| 673 | dma->dma_transfer_dir = DMA_DEV_TO_MEM; |
| 674 | dma->dma_data_dir = DMA_FROM_DEVICE; |
| 675 | /* The last two data bytes must be transferred by the CPU. */ |
| 676 | dma->dma_len = msgs->len - 2; |
| 677 | result = i2c_imx_dma_xfer(i2c_imx, msgs); |
| 678 | if (result) |
| 679 | return result; |
| 680 | |
| 681 | reinit_completion(&i2c_imx->dma->cmd_complete); |
Nicholas Mc Guire | 1ac63fe | 2015-02-08 06:39:56 -0500 | [diff] [blame] | 682 | time_left = wait_for_completion_timeout( |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 683 | &i2c_imx->dma->cmd_complete, |
| 684 | msecs_to_jiffies(DMA_TIMEOUT)); |
Nicholas Mc Guire | 1ac63fe | 2015-02-08 06:39:56 -0500 | [diff] [blame] | 685 | if (time_left == 0) { |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 686 | dmaengine_terminate_all(dma->chan_using); |
Nicholas Mc Guire | cb9eaba | 2014-12-27 08:33:53 -0500 | [diff] [blame] | 687 | return -ETIMEDOUT; |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 688 | } |
| 689 | |
| 690 | /* waiting for transfer complete. */ |
| 691 | while (1) { |
| 692 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR); |
| 693 | if (temp & I2SR_ICF) |
| 694 | break; |
| 695 | if (time_after(jiffies, orig_jiffies + |
| 696 | msecs_to_jiffies(DMA_TIMEOUT))) { |
| 697 | dev_dbg(dev, "<%s> Timeout\n", __func__); |
| 698 | return -ETIMEDOUT; |
| 699 | } |
| 700 | schedule(); |
| 701 | } |
| 702 | |
| 703 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
| 704 | temp &= ~I2CR_DMAEN; |
| 705 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
| 706 | |
| 707 | /* read n-1 byte data */ |
| 708 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
| 709 | temp |= I2CR_TXAK; |
| 710 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
| 711 | |
| 712 | msgs->buf[msgs->len-2] = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2DR); |
| 713 | /* read n byte data */ |
| 714 | result = i2c_imx_trx_complete(i2c_imx); |
| 715 | if (result) |
| 716 | return result; |
| 717 | |
| 718 | if (is_lastmsg) { |
| 719 | /* |
| 720 | * It must generate STOP before read I2DR to prevent |
| 721 | * controller from generating another clock cycle |
| 722 | */ |
| 723 | dev_dbg(dev, "<%s> clear MSTA\n", __func__); |
| 724 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
| 725 | temp &= ~(I2CR_MSTA | I2CR_MTX); |
| 726 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
| 727 | i2c_imx_bus_busy(i2c_imx, 0); |
| 728 | i2c_imx->stopped = 1; |
| 729 | } else { |
| 730 | /* |
| 731 | * For i2c master receiver repeat restart operation like: |
| 732 | * read -> repeat MSTA -> read/write |
| 733 | * The controller must set MTX before read the last byte in |
| 734 | * the first read operation, otherwise the first read cost |
| 735 | * one extra clock cycle. |
| 736 | */ |
| 737 | temp = readb(i2c_imx->base + IMX_I2C_I2CR); |
| 738 | temp |= I2CR_MTX; |
| 739 | writeb(temp, i2c_imx->base + IMX_I2C_I2CR); |
| 740 | } |
| 741 | msgs->buf[msgs->len-1] = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2DR); |
| 742 | |
| 743 | return 0; |
| 744 | } |
| 745 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 746 | static int i2c_imx_write(struct imx_i2c_struct *i2c_imx, struct i2c_msg *msgs) |
| 747 | { |
| 748 | int i, result; |
| 749 | |
| 750 | dev_dbg(&i2c_imx->adapter.dev, "<%s> write slave address: addr=0x%x\n", |
| 751 | __func__, msgs->addr << 1); |
| 752 | |
| 753 | /* write slave address */ |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 754 | imx_i2c_write_reg(msgs->addr << 1, i2c_imx, IMX_I2C_I2DR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 755 | result = i2c_imx_trx_complete(i2c_imx); |
| 756 | if (result) |
| 757 | return result; |
| 758 | result = i2c_imx_acked(i2c_imx); |
| 759 | if (result) |
| 760 | return result; |
| 761 | dev_dbg(&i2c_imx->adapter.dev, "<%s> write data\n", __func__); |
| 762 | |
| 763 | /* write data */ |
| 764 | for (i = 0; i < msgs->len; i++) { |
| 765 | dev_dbg(&i2c_imx->adapter.dev, |
| 766 | "<%s> write byte: B%d=0x%X\n", |
| 767 | __func__, i, msgs->buf[i]); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 768 | imx_i2c_write_reg(msgs->buf[i], i2c_imx, IMX_I2C_I2DR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 769 | result = i2c_imx_trx_complete(i2c_imx); |
| 770 | if (result) |
| 771 | return result; |
| 772 | result = i2c_imx_acked(i2c_imx); |
| 773 | if (result) |
| 774 | return result; |
| 775 | } |
| 776 | return 0; |
| 777 | } |
| 778 | |
Fugang Duan | 054b62d | 2014-04-30 14:24:58 +0800 | [diff] [blame] | 779 | static int i2c_imx_read(struct imx_i2c_struct *i2c_imx, struct i2c_msg *msgs, bool is_lastmsg) |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 780 | { |
| 781 | int i, result; |
| 782 | unsigned int temp; |
Kaushal Butala | 8e8782c | 2014-04-04 14:56:10 +0200 | [diff] [blame] | 783 | int block_data = msgs->flags & I2C_M_RECV_LEN; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 784 | |
| 785 | dev_dbg(&i2c_imx->adapter.dev, |
| 786 | "<%s> write slave address: addr=0x%x\n", |
| 787 | __func__, (msgs->addr << 1) | 0x01); |
| 788 | |
| 789 | /* write slave address */ |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 790 | 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] | 791 | result = i2c_imx_trx_complete(i2c_imx); |
| 792 | if (result) |
| 793 | return result; |
| 794 | result = i2c_imx_acked(i2c_imx); |
| 795 | if (result) |
| 796 | return result; |
| 797 | |
| 798 | dev_dbg(&i2c_imx->adapter.dev, "<%s> setup bus\n", __func__); |
| 799 | |
| 800 | /* setup bus to read data */ |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 801 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 802 | temp &= ~I2CR_MTX; |
Kaushal Butala | 8e8782c | 2014-04-04 14:56:10 +0200 | [diff] [blame] | 803 | |
| 804 | /* |
| 805 | * Reset the I2CR_TXAK flag initially for SMBus block read since the |
| 806 | * length is unknown |
| 807 | */ |
| 808 | if ((msgs->len - 1) || block_data) |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 809 | temp &= ~I2CR_TXAK; |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 810 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
| 811 | imx_i2c_read_reg(i2c_imx, IMX_I2C_I2DR); /* dummy read */ |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 812 | |
| 813 | dev_dbg(&i2c_imx->adapter.dev, "<%s> read data\n", __func__); |
| 814 | |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 815 | if (i2c_imx->dma && msgs->len >= DMA_THRESHOLD && !block_data) |
| 816 | return i2c_imx_dma_read(i2c_imx, msgs, is_lastmsg); |
| 817 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 818 | /* read data */ |
| 819 | for (i = 0; i < msgs->len; i++) { |
Kaushal Butala | 8e8782c | 2014-04-04 14:56:10 +0200 | [diff] [blame] | 820 | u8 len = 0; |
Philipp Zabel | 4e355f5 | 2015-01-22 16:17:29 +0100 | [diff] [blame] | 821 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 822 | result = i2c_imx_trx_complete(i2c_imx); |
| 823 | if (result) |
| 824 | return result; |
Kaushal Butala | 8e8782c | 2014-04-04 14:56:10 +0200 | [diff] [blame] | 825 | /* |
| 826 | * First byte is the length of remaining packet |
| 827 | * in the SMBus block data read. Add it to |
| 828 | * msgs->len. |
| 829 | */ |
| 830 | if ((!i) && block_data) { |
| 831 | len = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2DR); |
| 832 | if ((len == 0) || (len > I2C_SMBUS_BLOCK_MAX)) |
| 833 | return -EPROTO; |
| 834 | dev_dbg(&i2c_imx->adapter.dev, |
| 835 | "<%s> read length: 0x%X\n", |
| 836 | __func__, len); |
| 837 | msgs->len += len; |
| 838 | } |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 839 | if (i == (msgs->len - 1)) { |
Fugang Duan | 054b62d | 2014-04-30 14:24:58 +0800 | [diff] [blame] | 840 | if (is_lastmsg) { |
| 841 | /* |
| 842 | * It must generate STOP before read I2DR to prevent |
| 843 | * controller from generating another clock cycle |
| 844 | */ |
| 845 | dev_dbg(&i2c_imx->adapter.dev, |
| 846 | "<%s> clear MSTA\n", __func__); |
| 847 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
| 848 | temp &= ~(I2CR_MSTA | I2CR_MTX); |
| 849 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
| 850 | i2c_imx_bus_busy(i2c_imx, 0); |
| 851 | i2c_imx->stopped = 1; |
| 852 | } else { |
| 853 | /* |
| 854 | * For i2c master receiver repeat restart operation like: |
| 855 | * read -> repeat MSTA -> read/write |
| 856 | * The controller must set MTX before read the last byte in |
| 857 | * the first read operation, otherwise the first read cost |
| 858 | * one extra clock cycle. |
| 859 | */ |
| 860 | temp = readb(i2c_imx->base + IMX_I2C_I2CR); |
| 861 | temp |= I2CR_MTX; |
| 862 | writeb(temp, i2c_imx->base + IMX_I2C_I2CR); |
| 863 | } |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 864 | } else if (i == (msgs->len - 2)) { |
| 865 | dev_dbg(&i2c_imx->adapter.dev, |
| 866 | "<%s> set TXAK\n", __func__); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 867 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 868 | temp |= I2CR_TXAK; |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 869 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 870 | } |
Kaushal Butala | 8e8782c | 2014-04-04 14:56:10 +0200 | [diff] [blame] | 871 | if ((!i) && block_data) |
| 872 | msgs->buf[0] = len; |
| 873 | else |
Dmitriy Baranov | 3bf58bb | 2016-01-25 15:48:32 +0300 | [diff] [blame] | 874 | msgs->buf[i] = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2DR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 875 | dev_dbg(&i2c_imx->adapter.dev, |
| 876 | "<%s> read byte: B%d=0x%X\n", |
| 877 | __func__, i, msgs->buf[i]); |
| 878 | } |
| 879 | return 0; |
| 880 | } |
| 881 | |
| 882 | static int i2c_imx_xfer(struct i2c_adapter *adapter, |
| 883 | struct i2c_msg *msgs, int num) |
| 884 | { |
| 885 | unsigned int i, temp; |
| 886 | int result; |
Fugang Duan | 054b62d | 2014-04-30 14:24:58 +0800 | [diff] [blame] | 887 | bool is_lastmsg = false; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 888 | struct imx_i2c_struct *i2c_imx = i2c_get_adapdata(adapter); |
| 889 | |
| 890 | dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__); |
| 891 | |
Gao Pan | 588eb93 | 2015-12-11 10:24:09 +0800 | [diff] [blame] | 892 | result = pm_runtime_get_sync(i2c_imx->adapter.dev.parent); |
| 893 | if (result < 0) |
| 894 | goto out; |
| 895 | |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 896 | /* Start I2C transfer */ |
| 897 | result = i2c_imx_start(i2c_imx); |
Gao Pan | 1c4b6c3 | 2015-10-23 20:28:54 +0800 | [diff] [blame] | 898 | if (result) { |
| 899 | if (i2c_imx->adapter.bus_recovery_info) { |
| 900 | i2c_recover_bus(&i2c_imx->adapter); |
| 901 | result = i2c_imx_start(i2c_imx); |
| 902 | } |
| 903 | } |
| 904 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 905 | if (result) |
| 906 | goto fail0; |
| 907 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 908 | /* read/write data */ |
| 909 | for (i = 0; i < num; i++) { |
Fugang Duan | 054b62d | 2014-04-30 14:24:58 +0800 | [diff] [blame] | 910 | if (i == num - 1) |
| 911 | is_lastmsg = true; |
| 912 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 913 | if (i) { |
| 914 | dev_dbg(&i2c_imx->adapter.dev, |
| 915 | "<%s> repeated start\n", __func__); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 916 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 917 | temp |= I2CR_RSTA; |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 918 | imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR); |
Dmitriy Baranov | 3bf58bb | 2016-01-25 15:48:32 +0300 | [diff] [blame] | 919 | result = i2c_imx_bus_busy(i2c_imx, 1); |
Richard Zhao | 43309f3 | 2009-10-17 17:46:22 +0800 | [diff] [blame] | 920 | if (result) |
| 921 | goto fail0; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 922 | } |
| 923 | dev_dbg(&i2c_imx->adapter.dev, |
| 924 | "<%s> transfer message: %d\n", __func__, i); |
| 925 | /* write/read data */ |
| 926 | #ifdef CONFIG_I2C_DEBUG_BUS |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 927 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR); |
Philipp Zabel | 4e355f5 | 2015-01-22 16:17:29 +0100 | [diff] [blame] | 928 | dev_dbg(&i2c_imx->adapter.dev, |
| 929 | "<%s> CONTROL: IEN=%d, IIEN=%d, MSTA=%d, MTX=%d, TXAK=%d, RSTA=%d\n", |
| 930 | __func__, |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 931 | (temp & I2CR_IEN ? 1 : 0), (temp & I2CR_IIEN ? 1 : 0), |
| 932 | (temp & I2CR_MSTA ? 1 : 0), (temp & I2CR_MTX ? 1 : 0), |
| 933 | (temp & I2CR_TXAK ? 1 : 0), (temp & I2CR_RSTA ? 1 : 0)); |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 934 | temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 935 | dev_dbg(&i2c_imx->adapter.dev, |
Philipp Zabel | 4e355f5 | 2015-01-22 16:17:29 +0100 | [diff] [blame] | 936 | "<%s> STATUS: ICF=%d, IAAS=%d, IBB=%d, IAL=%d, SRW=%d, IIF=%d, RXAK=%d\n", |
| 937 | __func__, |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 938 | (temp & I2SR_ICF ? 1 : 0), (temp & I2SR_IAAS ? 1 : 0), |
| 939 | (temp & I2SR_IBB ? 1 : 0), (temp & I2SR_IAL ? 1 : 0), |
| 940 | (temp & I2SR_SRW ? 1 : 0), (temp & I2SR_IIF ? 1 : 0), |
| 941 | (temp & I2SR_RXAK ? 1 : 0)); |
| 942 | #endif |
| 943 | if (msgs[i].flags & I2C_M_RD) |
Fugang Duan | 054b62d | 2014-04-30 14:24:58 +0800 | [diff] [blame] | 944 | result = i2c_imx_read(i2c_imx, &msgs[i], is_lastmsg); |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 945 | else { |
| 946 | if (i2c_imx->dma && msgs[i].len >= DMA_THRESHOLD) |
| 947 | result = i2c_imx_dma_write(i2c_imx, &msgs[i]); |
| 948 | else |
| 949 | result = i2c_imx_write(i2c_imx, &msgs[i]); |
| 950 | } |
Arnaud Patard | da9c99f | 2010-03-23 17:28:28 +0100 | [diff] [blame] | 951 | if (result) |
| 952 | goto fail0; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 953 | } |
| 954 | |
| 955 | fail0: |
| 956 | /* Stop I2C transfer */ |
| 957 | i2c_imx_stop(i2c_imx); |
| 958 | |
Gao Pan | 588eb93 | 2015-12-11 10:24:09 +0800 | [diff] [blame] | 959 | pm_runtime_mark_last_busy(i2c_imx->adapter.dev.parent); |
| 960 | pm_runtime_put_autosuspend(i2c_imx->adapter.dev.parent); |
| 961 | |
| 962 | out: |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 963 | dev_dbg(&i2c_imx->adapter.dev, "<%s> exit with: %s: %d\n", __func__, |
| 964 | (result < 0) ? "error" : "success msg", |
| 965 | (result < 0) ? result : num); |
| 966 | return (result < 0) ? result : num; |
| 967 | } |
| 968 | |
Gao Pan | 1c4b6c3 | 2015-10-23 20:28:54 +0800 | [diff] [blame] | 969 | static void i2c_imx_prepare_recovery(struct i2c_adapter *adap) |
| 970 | { |
| 971 | struct imx_i2c_struct *i2c_imx; |
| 972 | |
| 973 | i2c_imx = container_of(adap, struct imx_i2c_struct, adapter); |
| 974 | |
| 975 | pinctrl_select_state(i2c_imx->pinctrl, i2c_imx->pinctrl_pins_gpio); |
| 976 | } |
| 977 | |
| 978 | static void i2c_imx_unprepare_recovery(struct i2c_adapter *adap) |
| 979 | { |
| 980 | struct imx_i2c_struct *i2c_imx; |
| 981 | |
| 982 | i2c_imx = container_of(adap, struct imx_i2c_struct, adapter); |
| 983 | |
| 984 | pinctrl_select_state(i2c_imx->pinctrl, i2c_imx->pinctrl_pins_default); |
| 985 | } |
| 986 | |
Yang Li | fd8961c | 2016-09-12 17:22:30 -0500 | [diff] [blame] | 987 | /* |
| 988 | * We switch SCL and SDA to their GPIO function and do some bitbanging |
| 989 | * for bus recovery. These alternative pinmux settings can be |
| 990 | * described in the device tree by a separate pinctrl state "gpio". If |
| 991 | * this is missing this is not a big problem, the only implication is |
| 992 | * that we can't do bus recovery. |
| 993 | */ |
| 994 | static int i2c_imx_init_recovery_info(struct imx_i2c_struct *i2c_imx, |
Gao Pan | 1c4b6c3 | 2015-10-23 20:28:54 +0800 | [diff] [blame] | 995 | struct platform_device *pdev) |
| 996 | { |
| 997 | struct i2c_bus_recovery_info *rinfo = &i2c_imx->rinfo; |
| 998 | |
Yang Li | fd8961c | 2016-09-12 17:22:30 -0500 | [diff] [blame] | 999 | i2c_imx->pinctrl = devm_pinctrl_get(&pdev->dev); |
| 1000 | if (!i2c_imx->pinctrl || IS_ERR(i2c_imx->pinctrl)) { |
| 1001 | dev_info(&pdev->dev, "can't get pinctrl, bus recovery not supported\n"); |
| 1002 | return PTR_ERR(i2c_imx->pinctrl); |
| 1003 | } |
| 1004 | |
Gao Pan | 1c4b6c3 | 2015-10-23 20:28:54 +0800 | [diff] [blame] | 1005 | i2c_imx->pinctrl_pins_default = pinctrl_lookup_state(i2c_imx->pinctrl, |
| 1006 | PINCTRL_STATE_DEFAULT); |
| 1007 | i2c_imx->pinctrl_pins_gpio = pinctrl_lookup_state(i2c_imx->pinctrl, |
| 1008 | "gpio"); |
Gao Pan | e8e7129 | 2015-11-02 17:05:30 +0800 | [diff] [blame] | 1009 | rinfo->sda_gpio = of_get_named_gpio(pdev->dev.of_node, "sda-gpios", 0); |
| 1010 | rinfo->scl_gpio = of_get_named_gpio(pdev->dev.of_node, "scl-gpios", 0); |
Gao Pan | 1c4b6c3 | 2015-10-23 20:28:54 +0800 | [diff] [blame] | 1011 | |
Stefan Agner | 533169d | 2016-09-26 17:18:58 -0700 | [diff] [blame^] | 1012 | if (rinfo->sda_gpio == -EPROBE_DEFER || |
| 1013 | rinfo->scl_gpio == -EPROBE_DEFER) { |
| 1014 | return -EPROBE_DEFER; |
| 1015 | } else if (!gpio_is_valid(rinfo->sda_gpio) || |
| 1016 | !gpio_is_valid(rinfo->scl_gpio) || |
| 1017 | IS_ERR(i2c_imx->pinctrl_pins_default) || |
| 1018 | IS_ERR(i2c_imx->pinctrl_pins_gpio)) { |
Gao Pan | 1c4b6c3 | 2015-10-23 20:28:54 +0800 | [diff] [blame] | 1019 | dev_dbg(&pdev->dev, "recovery information incomplete\n"); |
Yang Li | fd8961c | 2016-09-12 17:22:30 -0500 | [diff] [blame] | 1020 | return 0; |
Gao Pan | 1c4b6c3 | 2015-10-23 20:28:54 +0800 | [diff] [blame] | 1021 | } |
| 1022 | |
| 1023 | dev_dbg(&pdev->dev, "using scl-gpio %d and sda-gpio %d for recovery\n", |
| 1024 | rinfo->sda_gpio, rinfo->scl_gpio); |
| 1025 | |
| 1026 | rinfo->prepare_recovery = i2c_imx_prepare_recovery; |
| 1027 | rinfo->unprepare_recovery = i2c_imx_unprepare_recovery; |
| 1028 | rinfo->recover_bus = i2c_generic_gpio_recovery; |
| 1029 | i2c_imx->adapter.bus_recovery_info = rinfo; |
Yang Li | fd8961c | 2016-09-12 17:22:30 -0500 | [diff] [blame] | 1030 | |
| 1031 | return 0; |
Gao Pan | 1c4b6c3 | 2015-10-23 20:28:54 +0800 | [diff] [blame] | 1032 | } |
| 1033 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1034 | static u32 i2c_imx_func(struct i2c_adapter *adapter) |
| 1035 | { |
Kaushal Butala | 8e8782c | 2014-04-04 14:56:10 +0200 | [diff] [blame] | 1036 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
| 1037 | | I2C_FUNC_SMBUS_READ_BLOCK_DATA; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1038 | } |
| 1039 | |
| 1040 | static struct i2c_algorithm i2c_imx_algo = { |
| 1041 | .master_xfer = i2c_imx_xfer, |
| 1042 | .functionality = i2c_imx_func, |
| 1043 | }; |
| 1044 | |
Wolfram Sang | 3611431 | 2013-10-08 22:35:34 +0200 | [diff] [blame] | 1045 | static int i2c_imx_probe(struct platform_device *pdev) |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1046 | { |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 1047 | const struct of_device_id *of_id = of_match_device(i2c_imx_dt_ids, |
| 1048 | &pdev->dev); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1049 | struct imx_i2c_struct *i2c_imx; |
| 1050 | struct resource *res; |
Jingoo Han | 6d4028c | 2013-07-30 16:59:33 +0900 | [diff] [blame] | 1051 | struct imxi2c_platform_data *pdata = dev_get_platdata(&pdev->dev); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1052 | void __iomem *base; |
Wolfram Sang | 8c88ab0 | 2012-07-08 13:11:43 +0200 | [diff] [blame] | 1053 | int irq, ret; |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 1054 | dma_addr_t phy_addr; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1055 | |
| 1056 | dev_dbg(&pdev->dev, "<%s>\n", __func__); |
| 1057 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1058 | irq = platform_get_irq(pdev, 0); |
| 1059 | if (irq < 0) { |
| 1060 | dev_err(&pdev->dev, "can't get irq number\n"); |
Wolfram Sang | a8763f3 | 2013-12-12 22:51:31 +0100 | [diff] [blame] | 1061 | return irq; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1062 | } |
| 1063 | |
Wolfram Sang | 3cc2d00 | 2013-05-10 10:16:54 +0200 | [diff] [blame] | 1064 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
Thierry Reding | 84dbf80 | 2013-01-21 11:09:03 +0100 | [diff] [blame] | 1065 | base = devm_ioremap_resource(&pdev->dev, res); |
| 1066 | if (IS_ERR(base)) |
| 1067 | return PTR_ERR(base); |
Uwe Kleine-König | 4927fbf | 2010-01-08 17:23:17 +0100 | [diff] [blame] | 1068 | |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 1069 | phy_addr = (dma_addr_t)res->start; |
Fabio Estevam | d4ffeec | 2014-11-07 00:44:34 -0200 | [diff] [blame] | 1070 | i2c_imx = devm_kzalloc(&pdev->dev, sizeof(*i2c_imx), GFP_KERNEL); |
Jingoo Han | 46797a2 | 2014-05-13 10:51:58 +0900 | [diff] [blame] | 1071 | if (!i2c_imx) |
Richard Zhao | 9f8a3e7 | 2012-06-04 19:04:25 +0800 | [diff] [blame] | 1072 | return -ENOMEM; |
Darius Augulis | 309c18d | 2009-03-31 14:52:54 +0300 | [diff] [blame] | 1073 | |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 1074 | if (of_id) |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 1075 | i2c_imx->hwdata = of_id->data; |
Jingchang Lu | 0fc1347 | 2013-08-07 17:05:38 +0800 | [diff] [blame] | 1076 | else |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 1077 | i2c_imx->hwdata = (struct imx_i2c_hwdata *) |
| 1078 | platform_get_device_id(pdev)->driver_data; |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 1079 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1080 | /* Setup i2c_imx driver structure */ |
Wolfram Sang | 973c5ed | 2012-04-19 17:31:01 +0200 | [diff] [blame] | 1081 | strlcpy(i2c_imx->adapter.name, pdev->name, sizeof(i2c_imx->adapter.name)); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1082 | i2c_imx->adapter.owner = THIS_MODULE; |
| 1083 | i2c_imx->adapter.algo = &i2c_imx_algo; |
| 1084 | i2c_imx->adapter.dev.parent = &pdev->dev; |
Philipp Zabel | 4e355f5 | 2015-01-22 16:17:29 +0100 | [diff] [blame] | 1085 | i2c_imx->adapter.nr = pdev->id; |
Shawn Guo | dfcd04b | 2011-09-08 15:09:35 +0800 | [diff] [blame] | 1086 | i2c_imx->adapter.dev.of_node = pdev->dev.of_node; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1087 | i2c_imx->base = base; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1088 | |
| 1089 | /* Get I2C clock */ |
Fabio Estevam | 1f09c67 | 2012-07-06 15:31:32 -0300 | [diff] [blame] | 1090 | i2c_imx->clk = devm_clk_get(&pdev->dev, NULL); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1091 | if (IS_ERR(i2c_imx->clk)) { |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1092 | dev_err(&pdev->dev, "can't get I2C clock\n"); |
Richard Zhao | 9f8a3e7 | 2012-06-04 19:04:25 +0800 | [diff] [blame] | 1093 | return PTR_ERR(i2c_imx->clk); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1094 | } |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1095 | |
Jingchang Lu | 46f2832 | 2013-08-07 17:05:37 +0800 | [diff] [blame] | 1096 | ret = clk_prepare_enable(i2c_imx->clk); |
| 1097 | if (ret) { |
Gao Pan | 588eb93 | 2015-12-11 10:24:09 +0800 | [diff] [blame] | 1098 | dev_err(&pdev->dev, "can't enable I2C clock, ret=%d\n", ret); |
Jingchang Lu | 46f2832 | 2013-08-07 17:05:37 +0800 | [diff] [blame] | 1099 | return ret; |
| 1100 | } |
Gao Pan | 1c4b6c3 | 2015-10-23 20:28:54 +0800 | [diff] [blame] | 1101 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1102 | /* Request IRQ */ |
Richard Zhao | 9f8a3e7 | 2012-06-04 19:04:25 +0800 | [diff] [blame] | 1103 | ret = devm_request_irq(&pdev->dev, irq, i2c_imx_isr, 0, |
| 1104 | pdev->name, i2c_imx); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1105 | if (ret) { |
Richard Zhao | 9f8a3e7 | 2012-06-04 19:04:25 +0800 | [diff] [blame] | 1106 | dev_err(&pdev->dev, "can't claim irq %d\n", irq); |
Fabio Estevam | a4ce47f | 2014-10-04 09:17:27 -0300 | [diff] [blame] | 1107 | goto clk_disable; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1108 | } |
| 1109 | |
| 1110 | /* Init queue */ |
| 1111 | init_waitqueue_head(&i2c_imx->queue); |
| 1112 | |
| 1113 | /* Set up adapter data */ |
| 1114 | i2c_set_adapdata(&i2c_imx->adapter, i2c_imx); |
| 1115 | |
Gao Pan | 588eb93 | 2015-12-11 10:24:09 +0800 | [diff] [blame] | 1116 | /* Set up platform driver data */ |
| 1117 | platform_set_drvdata(pdev, i2c_imx); |
| 1118 | |
| 1119 | pm_runtime_set_autosuspend_delay(&pdev->dev, I2C_PM_TIMEOUT); |
| 1120 | pm_runtime_use_autosuspend(&pdev->dev); |
| 1121 | pm_runtime_set_active(&pdev->dev); |
| 1122 | pm_runtime_enable(&pdev->dev); |
| 1123 | |
| 1124 | ret = pm_runtime_get_sync(&pdev->dev); |
| 1125 | if (ret < 0) |
| 1126 | goto rpm_disable; |
| 1127 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1128 | /* Set up clock divider */ |
Fugang Duan | 9b2a6da | 2014-05-20 10:21:45 +0800 | [diff] [blame] | 1129 | i2c_imx->bitrate = IMX_I2C_BIT_RATE; |
Shawn Guo | dfcd04b | 2011-09-08 15:09:35 +0800 | [diff] [blame] | 1130 | ret = of_property_read_u32(pdev->dev.of_node, |
Fugang Duan | 9b2a6da | 2014-05-20 10:21:45 +0800 | [diff] [blame] | 1131 | "clock-frequency", &i2c_imx->bitrate); |
Shawn Guo | dfcd04b | 2011-09-08 15:09:35 +0800 | [diff] [blame] | 1132 | if (ret < 0 && pdata && pdata->bitrate) |
Fugang Duan | 9b2a6da | 2014-05-20 10:21:45 +0800 | [diff] [blame] | 1133 | i2c_imx->bitrate = pdata->bitrate; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1134 | |
| 1135 | /* Set up chip registers to defaults */ |
Jingchang Lu | 4b77502 | 2013-08-07 17:05:42 +0800 | [diff] [blame] | 1136 | imx_i2c_write_reg(i2c_imx->hwdata->i2cr_ien_opcode ^ I2CR_IEN, |
| 1137 | i2c_imx, IMX_I2C_I2CR); |
| 1138 | 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] | 1139 | |
Yang Li | fd8961c | 2016-09-12 17:22:30 -0500 | [diff] [blame] | 1140 | /* Init optional bus recovery function */ |
| 1141 | ret = i2c_imx_init_recovery_info(i2c_imx, pdev); |
| 1142 | /* Give it another chance if pinctrl used is not ready yet */ |
| 1143 | if (ret == -EPROBE_DEFER) |
| 1144 | goto rpm_disable; |
Gao Pan | a5f6501 | 2015-12-09 11:08:22 +0800 | [diff] [blame] | 1145 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1146 | /* Add I2C adapter */ |
| 1147 | ret = i2c_add_numbered_adapter(&i2c_imx->adapter); |
Wolfram Sang | ea73440 | 2016-08-09 13:36:17 +0200 | [diff] [blame] | 1148 | if (ret < 0) |
Gao Pan | 588eb93 | 2015-12-11 10:24:09 +0800 | [diff] [blame] | 1149 | goto rpm_disable; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1150 | |
Gao Pan | 588eb93 | 2015-12-11 10:24:09 +0800 | [diff] [blame] | 1151 | pm_runtime_mark_last_busy(&pdev->dev); |
| 1152 | pm_runtime_put_autosuspend(&pdev->dev); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1153 | |
Richard Zhao | 9f8a3e7 | 2012-06-04 19:04:25 +0800 | [diff] [blame] | 1154 | dev_dbg(&i2c_imx->adapter.dev, "claimed irq %d\n", irq); |
Xiubo Li | 64bdfbf | 2014-08-06 11:45:08 +0800 | [diff] [blame] | 1155 | dev_dbg(&i2c_imx->adapter.dev, "device resources: %pR\n", res); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1156 | dev_dbg(&i2c_imx->adapter.dev, "adapter name: \"%s\"\n", |
| 1157 | i2c_imx->adapter.name); |
Fabio Estevam | 06d141e | 2012-08-01 17:38:14 -0300 | [diff] [blame] | 1158 | dev_info(&i2c_imx->adapter.dev, "IMX I2C adapter registered\n"); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1159 | |
Philipp Zabel | 4e355f5 | 2015-01-22 16:17:29 +0100 | [diff] [blame] | 1160 | /* Init DMA config if supported */ |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 1161 | i2c_imx_dma_request(i2c_imx, phy_addr); |
| 1162 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1163 | return 0; /* Return OK */ |
Fabio Estevam | a4ce47f | 2014-10-04 09:17:27 -0300 | [diff] [blame] | 1164 | |
Gao Pan | 588eb93 | 2015-12-11 10:24:09 +0800 | [diff] [blame] | 1165 | rpm_disable: |
| 1166 | pm_runtime_put_noidle(&pdev->dev); |
| 1167 | pm_runtime_disable(&pdev->dev); |
| 1168 | pm_runtime_set_suspended(&pdev->dev); |
| 1169 | pm_runtime_dont_use_autosuspend(&pdev->dev); |
| 1170 | |
Fabio Estevam | a4ce47f | 2014-10-04 09:17:27 -0300 | [diff] [blame] | 1171 | clk_disable: |
| 1172 | clk_disable_unprepare(i2c_imx->clk); |
| 1173 | return ret; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1174 | } |
| 1175 | |
Wolfram Sang | 3611431 | 2013-10-08 22:35:34 +0200 | [diff] [blame] | 1176 | static int i2c_imx_remove(struct platform_device *pdev) |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1177 | { |
| 1178 | struct imx_i2c_struct *i2c_imx = platform_get_drvdata(pdev); |
Gao Pan | 588eb93 | 2015-12-11 10:24:09 +0800 | [diff] [blame] | 1179 | int ret; |
| 1180 | |
| 1181 | ret = pm_runtime_get_sync(&pdev->dev); |
| 1182 | if (ret < 0) |
| 1183 | return ret; |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1184 | |
| 1185 | /* remove adapter */ |
| 1186 | dev_dbg(&i2c_imx->adapter.dev, "adapter removed\n"); |
| 1187 | i2c_del_adapter(&i2c_imx->adapter); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1188 | |
Yao Yuan | ce1a788 | 2014-11-18 18:31:06 +0800 | [diff] [blame] | 1189 | if (i2c_imx->dma) |
| 1190 | i2c_imx_dma_free(i2c_imx); |
| 1191 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1192 | /* setup chip registers to defaults */ |
Jingchang Lu | 1d5ef2a | 2013-08-07 17:05:39 +0800 | [diff] [blame] | 1193 | imx_i2c_write_reg(0, i2c_imx, IMX_I2C_IADR); |
| 1194 | imx_i2c_write_reg(0, i2c_imx, IMX_I2C_IFDR); |
| 1195 | imx_i2c_write_reg(0, i2c_imx, IMX_I2C_I2CR); |
| 1196 | imx_i2c_write_reg(0, i2c_imx, IMX_I2C_I2SR); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1197 | |
Gao Pan | 588eb93 | 2015-12-11 10:24:09 +0800 | [diff] [blame] | 1198 | clk_disable_unprepare(i2c_imx->clk); |
| 1199 | |
| 1200 | pm_runtime_put_noidle(&pdev->dev); |
| 1201 | pm_runtime_disable(&pdev->dev); |
| 1202 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1203 | return 0; |
| 1204 | } |
| 1205 | |
Gao Pan | 588eb93 | 2015-12-11 10:24:09 +0800 | [diff] [blame] | 1206 | #ifdef CONFIG_PM |
| 1207 | static int i2c_imx_runtime_suspend(struct device *dev) |
| 1208 | { |
Dmitriy Baranov | 3bf58bb | 2016-01-25 15:48:32 +0300 | [diff] [blame] | 1209 | struct imx_i2c_struct *i2c_imx = dev_get_drvdata(dev); |
Gao Pan | 588eb93 | 2015-12-11 10:24:09 +0800 | [diff] [blame] | 1210 | |
| 1211 | clk_disable_unprepare(i2c_imx->clk); |
| 1212 | |
| 1213 | return 0; |
| 1214 | } |
| 1215 | |
| 1216 | static int i2c_imx_runtime_resume(struct device *dev) |
| 1217 | { |
Dmitriy Baranov | 3bf58bb | 2016-01-25 15:48:32 +0300 | [diff] [blame] | 1218 | struct imx_i2c_struct *i2c_imx = dev_get_drvdata(dev); |
Gao Pan | 588eb93 | 2015-12-11 10:24:09 +0800 | [diff] [blame] | 1219 | int ret; |
| 1220 | |
| 1221 | ret = clk_prepare_enable(i2c_imx->clk); |
| 1222 | if (ret) |
| 1223 | dev_err(dev, "can't enable I2C clock, ret=%d\n", ret); |
| 1224 | |
| 1225 | return ret; |
| 1226 | } |
| 1227 | |
| 1228 | static const struct dev_pm_ops i2c_imx_pm_ops = { |
| 1229 | SET_RUNTIME_PM_OPS(i2c_imx_runtime_suspend, |
| 1230 | i2c_imx_runtime_resume, NULL) |
| 1231 | }; |
| 1232 | #define I2C_IMX_PM_OPS (&i2c_imx_pm_ops) |
| 1233 | #else |
| 1234 | #define I2C_IMX_PM_OPS NULL |
| 1235 | #endif /* CONFIG_PM */ |
| 1236 | |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1237 | static struct platform_driver i2c_imx_driver = { |
Wolfram Sang | 3611431 | 2013-10-08 22:35:34 +0200 | [diff] [blame] | 1238 | .probe = i2c_imx_probe, |
| 1239 | .remove = i2c_imx_remove, |
Gao Pan | 588eb93 | 2015-12-11 10:24:09 +0800 | [diff] [blame] | 1240 | .driver = { |
| 1241 | .name = DRIVER_NAME, |
| 1242 | .pm = I2C_IMX_PM_OPS, |
Shawn Guo | dfcd04b | 2011-09-08 15:09:35 +0800 | [diff] [blame] | 1243 | .of_match_table = i2c_imx_dt_ids, |
Shawn Guo | 5bdfba2 | 2012-09-14 15:19:00 +0800 | [diff] [blame] | 1244 | }, |
Gao Pan | 588eb93 | 2015-12-11 10:24:09 +0800 | [diff] [blame] | 1245 | .id_table = imx_i2c_devtype, |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1246 | }; |
| 1247 | |
| 1248 | static int __init i2c_adap_imx_init(void) |
| 1249 | { |
Wolfram Sang | 3611431 | 2013-10-08 22:35:34 +0200 | [diff] [blame] | 1250 | return platform_driver_register(&i2c_imx_driver); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1251 | } |
Wolfram Sang | 5d3f333 | 2009-09-19 09:09:50 +0200 | [diff] [blame] | 1252 | subsys_initcall(i2c_adap_imx_init); |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1253 | |
| 1254 | static void __exit i2c_adap_imx_exit(void) |
| 1255 | { |
| 1256 | platform_driver_unregister(&i2c_imx_driver); |
| 1257 | } |
Darius Augulis | aa11e38 | 2009-01-30 10:32:28 +0200 | [diff] [blame] | 1258 | module_exit(i2c_adap_imx_exit); |
| 1259 | |
| 1260 | MODULE_LICENSE("GPL"); |
| 1261 | MODULE_AUTHOR("Darius Augulis"); |
| 1262 | MODULE_DESCRIPTION("I2C adapter driver for IMX I2C bus"); |
| 1263 | MODULE_ALIAS("platform:" DRIVER_NAME); |