Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 OKI SEMICONDUCTOR CO., LTD. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; version 2 of the License. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License |
| 14 | * along with this program; if not, write to the Free Software |
| 15 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. |
| 16 | */ |
| 17 | |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/delay.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/errno.h> |
| 23 | #include <linux/i2c.h> |
| 24 | #include <linux/fs.h> |
| 25 | #include <linux/io.h> |
| 26 | #include <linux/types.h> |
| 27 | #include <linux/interrupt.h> |
| 28 | #include <linux/jiffies.h> |
| 29 | #include <linux/pci.h> |
| 30 | #include <linux/mutex.h> |
| 31 | #include <linux/ktime.h> |
Wolfram Sang | 6dbc2f3 | 2011-02-23 11:11:35 +0100 | [diff] [blame] | 32 | #include <linux/slab.h> |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 33 | |
| 34 | #define PCH_EVENT_SET 0 /* I2C Interrupt Event Set Status */ |
| 35 | #define PCH_EVENT_NONE 1 /* I2C Interrupt Event Clear Status */ |
| 36 | #define PCH_MAX_CLK 100000 /* Maximum Clock speed in MHz */ |
| 37 | #define PCH_BUFFER_MODE_ENABLE 0x0002 /* flag for Buffer mode enable */ |
| 38 | #define PCH_EEPROM_SW_RST_MODE_ENABLE 0x0008 /* EEPROM SW RST enable flag */ |
| 39 | |
| 40 | #define PCH_I2CSADR 0x00 /* I2C slave address register */ |
| 41 | #define PCH_I2CCTL 0x04 /* I2C control register */ |
| 42 | #define PCH_I2CSR 0x08 /* I2C status register */ |
| 43 | #define PCH_I2CDR 0x0C /* I2C data register */ |
| 44 | #define PCH_I2CMON 0x10 /* I2C bus monitor register */ |
| 45 | #define PCH_I2CBC 0x14 /* I2C bus transfer rate setup counter */ |
| 46 | #define PCH_I2CMOD 0x18 /* I2C mode register */ |
| 47 | #define PCH_I2CBUFSLV 0x1C /* I2C buffer mode slave address register */ |
| 48 | #define PCH_I2CBUFSUB 0x20 /* I2C buffer mode subaddress register */ |
| 49 | #define PCH_I2CBUFFOR 0x24 /* I2C buffer mode format register */ |
| 50 | #define PCH_I2CBUFCTL 0x28 /* I2C buffer mode control register */ |
| 51 | #define PCH_I2CBUFMSK 0x2C /* I2C buffer mode interrupt mask register */ |
| 52 | #define PCH_I2CBUFSTA 0x30 /* I2C buffer mode status register */ |
| 53 | #define PCH_I2CBUFLEV 0x34 /* I2C buffer mode level register */ |
| 54 | #define PCH_I2CESRFOR 0x38 /* EEPROM software reset mode format register */ |
| 55 | #define PCH_I2CESRCTL 0x3C /* EEPROM software reset mode ctrl register */ |
| 56 | #define PCH_I2CESRMSK 0x40 /* EEPROM software reset mode */ |
| 57 | #define PCH_I2CESRSTA 0x44 /* EEPROM software reset mode status register */ |
| 58 | #define PCH_I2CTMR 0x48 /* I2C timer register */ |
| 59 | #define PCH_I2CSRST 0xFC /* I2C reset register */ |
| 60 | #define PCH_I2CNF 0xF8 /* I2C noise filter register */ |
| 61 | |
| 62 | #define BUS_IDLE_TIMEOUT 20 |
| 63 | #define PCH_I2CCTL_I2CMEN 0x0080 |
| 64 | #define TEN_BIT_ADDR_DEFAULT 0xF000 |
| 65 | #define TEN_BIT_ADDR_MASK 0xF0 |
| 66 | #define PCH_START 0x0020 |
Tomoya MORINAGA | c249ac2 | 2011-10-12 13:13:02 +0900 | [diff] [blame] | 67 | #define PCH_RESTART 0x0004 |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 68 | #define PCH_ESR_START 0x0001 |
| 69 | #define PCH_BUFF_START 0x1 |
| 70 | #define PCH_REPSTART 0x0004 |
| 71 | #define PCH_ACK 0x0008 |
| 72 | #define PCH_GETACK 0x0001 |
| 73 | #define CLR_REG 0x0 |
| 74 | #define I2C_RD 0x1 |
| 75 | #define I2CMCF_BIT 0x0080 |
| 76 | #define I2CMIF_BIT 0x0002 |
| 77 | #define I2CMAL_BIT 0x0010 |
| 78 | #define I2CBMFI_BIT 0x0001 |
| 79 | #define I2CBMAL_BIT 0x0002 |
| 80 | #define I2CBMNA_BIT 0x0004 |
| 81 | #define I2CBMTO_BIT 0x0008 |
| 82 | #define I2CBMIS_BIT 0x0010 |
| 83 | #define I2CESRFI_BIT 0X0001 |
| 84 | #define I2CESRTO_BIT 0x0002 |
| 85 | #define I2CESRFIIE_BIT 0x1 |
| 86 | #define I2CESRTOIE_BIT 0x2 |
| 87 | #define I2CBMDZ_BIT 0x0040 |
| 88 | #define I2CBMAG_BIT 0x0020 |
| 89 | #define I2CMBB_BIT 0x0020 |
| 90 | #define BUFFER_MODE_MASK (I2CBMFI_BIT | I2CBMAL_BIT | I2CBMNA_BIT | \ |
| 91 | I2CBMTO_BIT | I2CBMIS_BIT) |
| 92 | #define I2C_ADDR_MSK 0xFF |
| 93 | #define I2C_MSB_2B_MSK 0x300 |
| 94 | #define FAST_MODE_CLK 400 |
| 95 | #define FAST_MODE_EN 0x0001 |
| 96 | #define SUB_ADDR_LEN_MAX 4 |
| 97 | #define BUF_LEN_MAX 32 |
| 98 | #define PCH_BUFFER_MODE 0x1 |
| 99 | #define EEPROM_SW_RST_MODE 0x0002 |
| 100 | #define NORMAL_INTR_ENBL 0x0300 |
| 101 | #define EEPROM_RST_INTR_ENBL (I2CESRFIIE_BIT | I2CESRTOIE_BIT) |
| 102 | #define EEPROM_RST_INTR_DISBL 0x0 |
| 103 | #define BUFFER_MODE_INTR_ENBL 0x001F |
| 104 | #define BUFFER_MODE_INTR_DISBL 0x0 |
| 105 | #define NORMAL_MODE 0x0 |
| 106 | #define BUFFER_MODE 0x1 |
| 107 | #define EEPROM_SR_MODE 0x2 |
| 108 | #define I2C_TX_MODE 0x0010 |
| 109 | #define PCH_BUF_TX 0xFFF7 |
| 110 | #define PCH_BUF_RD 0x0008 |
| 111 | #define I2C_ERROR_MASK (I2CESRTO_EVENT | I2CBMIS_EVENT | I2CBMTO_EVENT | \ |
| 112 | I2CBMNA_EVENT | I2CBMAL_EVENT | I2CMAL_EVENT) |
| 113 | #define I2CMAL_EVENT 0x0001 |
| 114 | #define I2CMCF_EVENT 0x0002 |
| 115 | #define I2CBMFI_EVENT 0x0004 |
| 116 | #define I2CBMAL_EVENT 0x0008 |
| 117 | #define I2CBMNA_EVENT 0x0010 |
| 118 | #define I2CBMTO_EVENT 0x0020 |
| 119 | #define I2CBMIS_EVENT 0x0040 |
| 120 | #define I2CESRFI_EVENT 0x0080 |
| 121 | #define I2CESRTO_EVENT 0x0100 |
| 122 | #define PCI_DEVICE_ID_PCH_I2C 0x8817 |
| 123 | |
| 124 | #define pch_dbg(adap, fmt, arg...) \ |
| 125 | dev_dbg(adap->pch_adapter.dev.parent, "%s :" fmt, __func__, ##arg) |
| 126 | |
| 127 | #define pch_err(adap, fmt, arg...) \ |
| 128 | dev_err(adap->pch_adapter.dev.parent, "%s :" fmt, __func__, ##arg) |
| 129 | |
| 130 | #define pch_pci_err(pdev, fmt, arg...) \ |
| 131 | dev_err(&pdev->dev, "%s :" fmt, __func__, ##arg) |
| 132 | |
| 133 | #define pch_pci_dbg(pdev, fmt, arg...) \ |
| 134 | dev_dbg(&pdev->dev, "%s :" fmt, __func__, ##arg) |
| 135 | |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 136 | /* |
| 137 | Set the number of I2C instance max |
| 138 | Intel EG20T PCH : 1ch |
| 139 | OKI SEMICONDUCTOR ML7213 IOH : 2ch |
Tomoya MORINAGA | c3f4661 | 2011-10-28 09:40:10 +0900 | [diff] [blame^] | 140 | OKI SEMICONDUCTOR ML7831 IOH : 1ch |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 141 | */ |
| 142 | #define PCH_I2C_MAX_DEV 2 |
| 143 | |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 144 | /** |
| 145 | * struct i2c_algo_pch_data - for I2C driver functionalities |
| 146 | * @pch_adapter: stores the reference to i2c_adapter structure |
| 147 | * @p_adapter_info: stores the reference to adapter_info structure |
| 148 | * @pch_base_address: specifies the remapped base address |
| 149 | * @pch_buff_mode_en: specifies if buffer mode is enabled |
| 150 | * @pch_event_flag: specifies occurrence of interrupt events |
| 151 | * @pch_i2c_xfer_in_progress: specifies whether the transfer is completed |
| 152 | */ |
| 153 | struct i2c_algo_pch_data { |
| 154 | struct i2c_adapter pch_adapter; |
| 155 | struct adapter_info *p_adapter_info; |
| 156 | void __iomem *pch_base_address; |
| 157 | int pch_buff_mode_en; |
| 158 | u32 pch_event_flag; |
| 159 | bool pch_i2c_xfer_in_progress; |
| 160 | }; |
| 161 | |
| 162 | /** |
| 163 | * struct adapter_info - This structure holds the adapter information for the |
| 164 | PCH i2c controller |
| 165 | * @pch_data: stores a list of i2c_algo_pch_data |
| 166 | * @pch_i2c_suspended: specifies whether the system is suspended or not |
| 167 | * perhaps with more lines and words. |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 168 | * @ch_num: specifies the number of i2c instance |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 169 | * |
| 170 | * pch_data has as many elements as maximum I2C channels |
| 171 | */ |
| 172 | struct adapter_info { |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 173 | struct i2c_algo_pch_data pch_data[PCH_I2C_MAX_DEV]; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 174 | bool pch_i2c_suspended; |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 175 | int ch_num; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 176 | }; |
| 177 | |
| 178 | |
| 179 | static int pch_i2c_speed = 100; /* I2C bus speed in Kbps */ |
| 180 | static int pch_clk = 50000; /* specifies I2C clock speed in KHz */ |
| 181 | static wait_queue_head_t pch_event; |
| 182 | static DEFINE_MUTEX(pch_mutex); |
| 183 | |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 184 | /* Definition for ML7213 by OKI SEMICONDUCTOR */ |
| 185 | #define PCI_VENDOR_ID_ROHM 0x10DB |
| 186 | #define PCI_DEVICE_ID_ML7213_I2C 0x802D |
Tomoya MORINAGA | efbe0f2 | 2011-05-09 16:32:31 +0900 | [diff] [blame] | 187 | #define PCI_DEVICE_ID_ML7223_I2C 0x8010 |
Tomoya MORINAGA | c3f4661 | 2011-10-28 09:40:10 +0900 | [diff] [blame^] | 188 | #define PCI_DEVICE_ID_ML7831_I2C 0x8817 |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 189 | |
Axel Lin | 3527bd5 | 2012-01-12 20:32:04 +0100 | [diff] [blame] | 190 | static DEFINE_PCI_DEVICE_TABLE(pch_pcidev_id) = { |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 191 | { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_PCH_I2C), 1, }, |
| 192 | { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_I2C), 2, }, |
Tomoya MORINAGA | efbe0f2 | 2011-05-09 16:32:31 +0900 | [diff] [blame] | 193 | { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_I2C), 1, }, |
Tomoya MORINAGA | c3f4661 | 2011-10-28 09:40:10 +0900 | [diff] [blame^] | 194 | { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7831_I2C), 1, }, |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 195 | {0,} |
| 196 | }; |
| 197 | |
| 198 | static irqreturn_t pch_i2c_handler(int irq, void *pData); |
| 199 | |
| 200 | static inline void pch_setbit(void __iomem *addr, u32 offset, u32 bitmask) |
| 201 | { |
| 202 | u32 val; |
| 203 | val = ioread32(addr + offset); |
| 204 | val |= bitmask; |
| 205 | iowrite32(val, addr + offset); |
| 206 | } |
| 207 | |
| 208 | static inline void pch_clrbit(void __iomem *addr, u32 offset, u32 bitmask) |
| 209 | { |
| 210 | u32 val; |
| 211 | val = ioread32(addr + offset); |
| 212 | val &= (~bitmask); |
| 213 | iowrite32(val, addr + offset); |
| 214 | } |
| 215 | |
| 216 | /** |
| 217 | * pch_i2c_init() - hardware initialization of I2C module |
| 218 | * @adap: Pointer to struct i2c_algo_pch_data. |
| 219 | */ |
| 220 | static void pch_i2c_init(struct i2c_algo_pch_data *adap) |
| 221 | { |
| 222 | void __iomem *p = adap->pch_base_address; |
| 223 | u32 pch_i2cbc; |
| 224 | u32 pch_i2ctmr; |
| 225 | u32 reg_value; |
| 226 | |
| 227 | /* reset I2C controller */ |
| 228 | iowrite32(0x01, p + PCH_I2CSRST); |
| 229 | msleep(20); |
| 230 | iowrite32(0x0, p + PCH_I2CSRST); |
| 231 | |
| 232 | /* Initialize I2C registers */ |
| 233 | iowrite32(0x21, p + PCH_I2CNF); |
| 234 | |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 235 | pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_I2CCTL_I2CMEN); |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 236 | |
| 237 | if (pch_i2c_speed != 400) |
| 238 | pch_i2c_speed = 100; |
| 239 | |
| 240 | reg_value = PCH_I2CCTL_I2CMEN; |
| 241 | if (pch_i2c_speed == FAST_MODE_CLK) { |
| 242 | reg_value |= FAST_MODE_EN; |
| 243 | pch_dbg(adap, "Fast mode enabled\n"); |
| 244 | } |
| 245 | |
| 246 | if (pch_clk > PCH_MAX_CLK) |
| 247 | pch_clk = 62500; |
| 248 | |
Toshiharu Okada | ff35e8b | 2011-09-26 16:16:23 +0900 | [diff] [blame] | 249 | pch_i2cbc = (pch_clk + (pch_i2c_speed * 4)) / (pch_i2c_speed * 8); |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 250 | /* Set transfer speed in I2CBC */ |
| 251 | iowrite32(pch_i2cbc, p + PCH_I2CBC); |
| 252 | |
| 253 | pch_i2ctmr = (pch_clk) / 8; |
| 254 | iowrite32(pch_i2ctmr, p + PCH_I2CTMR); |
| 255 | |
| 256 | reg_value |= NORMAL_INTR_ENBL; /* Enable interrupts in normal mode */ |
| 257 | iowrite32(reg_value, p + PCH_I2CCTL); |
| 258 | |
| 259 | pch_dbg(adap, |
| 260 | "I2CCTL=%x pch_i2cbc=%x pch_i2ctmr=%x Enable interrupts\n", |
| 261 | ioread32(p + PCH_I2CCTL), pch_i2cbc, pch_i2ctmr); |
| 262 | |
| 263 | init_waitqueue_head(&pch_event); |
| 264 | } |
| 265 | |
| 266 | static inline bool ktime_lt(const ktime_t cmp1, const ktime_t cmp2) |
| 267 | { |
| 268 | return cmp1.tv64 < cmp2.tv64; |
| 269 | } |
| 270 | |
| 271 | /** |
| 272 | * pch_i2c_wait_for_bus_idle() - check the status of bus. |
| 273 | * @adap: Pointer to struct i2c_algo_pch_data. |
| 274 | * @timeout: waiting time counter (us). |
| 275 | */ |
| 276 | static s32 pch_i2c_wait_for_bus_idle(struct i2c_algo_pch_data *adap, |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 277 | s32 timeout) |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 278 | { |
| 279 | void __iomem *p = adap->pch_base_address; |
Tomoya MORINAGA | 93e4ad7 | 2011-10-12 13:13:00 +0900 | [diff] [blame] | 280 | ktime_t ns_val; |
| 281 | |
| 282 | if ((ioread32(p + PCH_I2CSR) & I2CMBB_BIT) == 0) |
| 283 | return 0; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 284 | |
| 285 | /* MAX timeout value is timeout*1000*1000nsec */ |
Tomoya MORINAGA | 93e4ad7 | 2011-10-12 13:13:00 +0900 | [diff] [blame] | 286 | ns_val = ktime_add_ns(ktime_get(), timeout*1000*1000); |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 287 | do { |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 288 | msleep(20); |
Tomoya MORINAGA | 93e4ad7 | 2011-10-12 13:13:00 +0900 | [diff] [blame] | 289 | if ((ioread32(p + PCH_I2CSR) & I2CMBB_BIT) == 0) |
| 290 | return 0; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 291 | } while (ktime_lt(ktime_get(), ns_val)); |
| 292 | |
| 293 | pch_dbg(adap, "I2CSR = %x\n", ioread32(p + PCH_I2CSR)); |
Tomoya MORINAGA | 93e4ad7 | 2011-10-12 13:13:00 +0900 | [diff] [blame] | 294 | pch_err(adap, "%s: Timeout Error.return%d\n", __func__, -ETIME); |
Tomoya MORINAGA | 24597bf | 2011-10-12 13:13:06 +0900 | [diff] [blame] | 295 | pch_i2c_init(adap); |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 296 | |
Tomoya MORINAGA | 93e4ad7 | 2011-10-12 13:13:00 +0900 | [diff] [blame] | 297 | return -ETIME; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 298 | } |
| 299 | |
| 300 | /** |
| 301 | * pch_i2c_start() - Generate I2C start condition in normal mode. |
| 302 | * @adap: Pointer to struct i2c_algo_pch_data. |
| 303 | * |
| 304 | * Generate I2C start condition in normal mode by setting I2CCTL.I2CMSTA to 1. |
| 305 | */ |
| 306 | static void pch_i2c_start(struct i2c_algo_pch_data *adap) |
| 307 | { |
| 308 | void __iomem *p = adap->pch_base_address; |
| 309 | pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL)); |
| 310 | pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_START); |
| 311 | } |
| 312 | |
| 313 | /** |
| 314 | * pch_i2c_wait_for_xfer_complete() - initiates a wait for the tx complete event |
| 315 | * @adap: Pointer to struct i2c_algo_pch_data. |
| 316 | */ |
| 317 | static s32 pch_i2c_wait_for_xfer_complete(struct i2c_algo_pch_data *adap) |
| 318 | { |
Tomoya MORINAGA | c7b41f3 | 2011-10-12 13:13:01 +0900 | [diff] [blame] | 319 | long ret; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 320 | ret = wait_event_timeout(pch_event, |
| 321 | (adap->pch_event_flag != 0), msecs_to_jiffies(50)); |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 322 | |
| 323 | if (ret == 0) { |
| 324 | pch_err(adap, "timeout: %x\n", adap->pch_event_flag); |
Tomoya MORINAGA | cb59f52 | 2011-10-12 13:13:05 +0900 | [diff] [blame] | 325 | adap->pch_event_flag = 0; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 326 | return -ETIMEDOUT; |
| 327 | } |
| 328 | |
| 329 | if (adap->pch_event_flag & I2C_ERROR_MASK) { |
| 330 | pch_err(adap, "error bits set: %x\n", adap->pch_event_flag); |
Tomoya MORINAGA | cb59f52 | 2011-10-12 13:13:05 +0900 | [diff] [blame] | 331 | adap->pch_event_flag = 0; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 332 | return -EIO; |
| 333 | } |
| 334 | |
| 335 | adap->pch_event_flag = 0; |
| 336 | |
| 337 | return 0; |
| 338 | } |
| 339 | |
| 340 | /** |
| 341 | * pch_i2c_getack() - to confirm ACK/NACK |
| 342 | * @adap: Pointer to struct i2c_algo_pch_data. |
| 343 | */ |
| 344 | static s32 pch_i2c_getack(struct i2c_algo_pch_data *adap) |
| 345 | { |
| 346 | u32 reg_val; |
| 347 | void __iomem *p = adap->pch_base_address; |
| 348 | reg_val = ioread32(p + PCH_I2CSR) & PCH_GETACK; |
| 349 | |
| 350 | if (reg_val != 0) { |
| 351 | pch_err(adap, "return%d\n", -EPROTO); |
| 352 | return -EPROTO; |
| 353 | } |
| 354 | |
| 355 | return 0; |
| 356 | } |
| 357 | |
| 358 | /** |
| 359 | * pch_i2c_stop() - generate stop condition in normal mode. |
| 360 | * @adap: Pointer to struct i2c_algo_pch_data. |
| 361 | */ |
| 362 | static void pch_i2c_stop(struct i2c_algo_pch_data *adap) |
| 363 | { |
| 364 | void __iomem *p = adap->pch_base_address; |
| 365 | pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL)); |
| 366 | /* clear the start bit */ |
| 367 | pch_clrbit(adap->pch_base_address, PCH_I2CCTL, PCH_START); |
| 368 | } |
| 369 | |
| 370 | /** |
| 371 | * pch_i2c_repstart() - generate repeated start condition in normal mode |
| 372 | * @adap: Pointer to struct i2c_algo_pch_data. |
| 373 | */ |
| 374 | static void pch_i2c_repstart(struct i2c_algo_pch_data *adap) |
| 375 | { |
| 376 | void __iomem *p = adap->pch_base_address; |
| 377 | pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL)); |
| 378 | pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_REPSTART); |
| 379 | } |
| 380 | |
| 381 | /** |
| 382 | * pch_i2c_writebytes() - write data to I2C bus in normal mode |
| 383 | * @i2c_adap: Pointer to the struct i2c_adapter. |
| 384 | * @last: specifies whether last message or not. |
| 385 | * In the case of compound mode it will be 1 for last message, |
| 386 | * otherwise 0. |
| 387 | * @first: specifies whether first message or not. |
| 388 | * 1 for first message otherwise 0. |
| 389 | */ |
| 390 | static s32 pch_i2c_writebytes(struct i2c_adapter *i2c_adap, |
| 391 | struct i2c_msg *msgs, u32 last, u32 first) |
| 392 | { |
| 393 | struct i2c_algo_pch_data *adap = i2c_adap->algo_data; |
| 394 | u8 *buf; |
| 395 | u32 length; |
| 396 | u32 addr; |
| 397 | u32 addr_2_msb; |
| 398 | u32 addr_8_lsb; |
| 399 | s32 wrcount; |
Tomoya MORINAGA | 12bd314 | 2011-10-12 13:13:03 +0900 | [diff] [blame] | 400 | s32 rtn; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 401 | void __iomem *p = adap->pch_base_address; |
| 402 | |
| 403 | length = msgs->len; |
| 404 | buf = msgs->buf; |
| 405 | addr = msgs->addr; |
| 406 | |
| 407 | /* enable master tx */ |
| 408 | pch_setbit(adap->pch_base_address, PCH_I2CCTL, I2C_TX_MODE); |
| 409 | |
| 410 | pch_dbg(adap, "I2CCTL = %x msgs->len = %d\n", ioread32(p + PCH_I2CCTL), |
| 411 | length); |
| 412 | |
| 413 | if (first) { |
| 414 | if (pch_i2c_wait_for_bus_idle(adap, BUS_IDLE_TIMEOUT) == -ETIME) |
| 415 | return -ETIME; |
| 416 | } |
| 417 | |
| 418 | if (msgs->flags & I2C_M_TEN) { |
Tomoya MORINAGA | c249ac2 | 2011-10-12 13:13:02 +0900 | [diff] [blame] | 419 | addr_2_msb = ((addr & I2C_MSB_2B_MSK) >> 7) & 0x06; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 420 | iowrite32(addr_2_msb | TEN_BIT_ADDR_MASK, p + PCH_I2CDR); |
| 421 | if (first) |
| 422 | pch_i2c_start(adap); |
Tomoya MORINAGA | 12bd314 | 2011-10-12 13:13:03 +0900 | [diff] [blame] | 423 | |
| 424 | rtn = pch_i2c_wait_for_xfer_complete(adap); |
| 425 | if (rtn == 0) { |
| 426 | if (pch_i2c_getack(adap)) { |
| 427 | pch_dbg(adap, "Receive NACK for slave address" |
| 428 | "setting\n"); |
| 429 | return -EIO; |
| 430 | } |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 431 | addr_8_lsb = (addr & I2C_ADDR_MSK); |
| 432 | iowrite32(addr_8_lsb, p + PCH_I2CDR); |
Tomoya MORINAGA | 12bd314 | 2011-10-12 13:13:03 +0900 | [diff] [blame] | 433 | } else if (rtn == -EIO) { /* Arbitration Lost */ |
| 434 | pch_err(adap, "Lost Arbitration\n"); |
| 435 | pch_clrbit(adap->pch_base_address, PCH_I2CSR, |
| 436 | I2CMAL_BIT); |
| 437 | pch_clrbit(adap->pch_base_address, PCH_I2CSR, |
| 438 | I2CMIF_BIT); |
| 439 | pch_i2c_init(adap); |
| 440 | return -EAGAIN; |
| 441 | } else { /* wait-event timeout */ |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 442 | pch_i2c_stop(adap); |
| 443 | return -ETIME; |
| 444 | } |
| 445 | } else { |
| 446 | /* set 7 bit slave address and R/W bit as 0 */ |
| 447 | iowrite32(addr << 1, p + PCH_I2CDR); |
| 448 | if (first) |
| 449 | pch_i2c_start(adap); |
| 450 | } |
| 451 | |
Tomoya MORINAGA | 12bd314 | 2011-10-12 13:13:03 +0900 | [diff] [blame] | 452 | rtn = pch_i2c_wait_for_xfer_complete(adap); |
| 453 | if (rtn == 0) { |
| 454 | if (pch_i2c_getack(adap)) { |
| 455 | pch_dbg(adap, "Receive NACK for slave address" |
| 456 | "setting\n"); |
| 457 | return -EIO; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 458 | } |
Tomoya MORINAGA | 12bd314 | 2011-10-12 13:13:03 +0900 | [diff] [blame] | 459 | } else if (rtn == -EIO) { /* Arbitration Lost */ |
| 460 | pch_err(adap, "Lost Arbitration\n"); |
| 461 | pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMAL_BIT); |
| 462 | pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMIF_BIT); |
Tomoya MORINAGA | 24597bf | 2011-10-12 13:13:06 +0900 | [diff] [blame] | 463 | pch_i2c_init(adap); |
Tomoya MORINAGA | 12bd314 | 2011-10-12 13:13:03 +0900 | [diff] [blame] | 464 | return -EAGAIN; |
| 465 | } else { /* wait-event timeout */ |
Tomoya MORINAGA | 3cf21a7 | 2011-10-12 13:13:04 +0900 | [diff] [blame] | 466 | pch_i2c_stop(adap); |
Tomoya MORINAGA | 12bd314 | 2011-10-12 13:13:03 +0900 | [diff] [blame] | 467 | return -ETIME; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 468 | } |
| 469 | |
Tomoya MORINAGA | 12bd314 | 2011-10-12 13:13:03 +0900 | [diff] [blame] | 470 | for (wrcount = 0; wrcount < length; ++wrcount) { |
| 471 | /* write buffer value to I2C data register */ |
| 472 | iowrite32(buf[wrcount], p + PCH_I2CDR); |
| 473 | pch_dbg(adap, "writing %x to Data register\n", buf[wrcount]); |
| 474 | |
| 475 | rtn = pch_i2c_wait_for_xfer_complete(adap); |
| 476 | if (rtn == 0) { |
| 477 | if (pch_i2c_getack(adap)) { |
| 478 | pch_dbg(adap, "Receive NACK for slave address" |
| 479 | "setting\n"); |
| 480 | return -EIO; |
| 481 | } |
| 482 | pch_clrbit(adap->pch_base_address, PCH_I2CSR, |
| 483 | I2CMCF_BIT); |
| 484 | pch_clrbit(adap->pch_base_address, PCH_I2CSR, |
| 485 | I2CMIF_BIT); |
| 486 | } else { /* wait-event timeout */ |
Tomoya MORINAGA | 3cf21a7 | 2011-10-12 13:13:04 +0900 | [diff] [blame] | 487 | pch_i2c_stop(adap); |
Tomoya MORINAGA | 12bd314 | 2011-10-12 13:13:03 +0900 | [diff] [blame] | 488 | return -ETIME; |
| 489 | } |
| 490 | } |
| 491 | |
| 492 | /* check if this is the last message */ |
| 493 | if (last) |
| 494 | pch_i2c_stop(adap); |
| 495 | else |
| 496 | pch_i2c_repstart(adap); |
| 497 | |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 498 | pch_dbg(adap, "return=%d\n", wrcount); |
| 499 | |
| 500 | return wrcount; |
| 501 | } |
| 502 | |
| 503 | /** |
| 504 | * pch_i2c_sendack() - send ACK |
| 505 | * @adap: Pointer to struct i2c_algo_pch_data. |
| 506 | */ |
| 507 | static void pch_i2c_sendack(struct i2c_algo_pch_data *adap) |
| 508 | { |
| 509 | void __iomem *p = adap->pch_base_address; |
| 510 | pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL)); |
| 511 | pch_clrbit(adap->pch_base_address, PCH_I2CCTL, PCH_ACK); |
| 512 | } |
| 513 | |
| 514 | /** |
| 515 | * pch_i2c_sendnack() - send NACK |
| 516 | * @adap: Pointer to struct i2c_algo_pch_data. |
| 517 | */ |
| 518 | static void pch_i2c_sendnack(struct i2c_algo_pch_data *adap) |
| 519 | { |
| 520 | void __iomem *p = adap->pch_base_address; |
| 521 | pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL)); |
| 522 | pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_ACK); |
| 523 | } |
| 524 | |
| 525 | /** |
Tomoya MORINAGA | c249ac2 | 2011-10-12 13:13:02 +0900 | [diff] [blame] | 526 | * pch_i2c_restart() - Generate I2C restart condition in normal mode. |
| 527 | * @adap: Pointer to struct i2c_algo_pch_data. |
| 528 | * |
| 529 | * Generate I2C restart condition in normal mode by setting I2CCTL.I2CRSTA. |
| 530 | */ |
| 531 | static void pch_i2c_restart(struct i2c_algo_pch_data *adap) |
| 532 | { |
| 533 | void __iomem *p = adap->pch_base_address; |
| 534 | pch_dbg(adap, "I2CCTL = %x\n", ioread32(p + PCH_I2CCTL)); |
| 535 | pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_RESTART); |
| 536 | } |
| 537 | |
| 538 | /** |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 539 | * pch_i2c_readbytes() - read data from I2C bus in normal mode. |
| 540 | * @i2c_adap: Pointer to the struct i2c_adapter. |
| 541 | * @msgs: Pointer to i2c_msg structure. |
| 542 | * @last: specifies whether last message or not. |
| 543 | * @first: specifies whether first message or not. |
| 544 | */ |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 545 | static s32 pch_i2c_readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, |
| 546 | u32 last, u32 first) |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 547 | { |
| 548 | struct i2c_algo_pch_data *adap = i2c_adap->algo_data; |
| 549 | |
| 550 | u8 *buf; |
| 551 | u32 count; |
| 552 | u32 length; |
| 553 | u32 addr; |
| 554 | u32 addr_2_msb; |
Tomoya MORINAGA | c249ac2 | 2011-10-12 13:13:02 +0900 | [diff] [blame] | 555 | u32 addr_8_lsb; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 556 | void __iomem *p = adap->pch_base_address; |
Tomoya MORINAGA | 12bd314 | 2011-10-12 13:13:03 +0900 | [diff] [blame] | 557 | s32 rtn; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 558 | |
| 559 | length = msgs->len; |
| 560 | buf = msgs->buf; |
| 561 | addr = msgs->addr; |
| 562 | |
| 563 | /* enable master reception */ |
| 564 | pch_clrbit(adap->pch_base_address, PCH_I2CCTL, I2C_TX_MODE); |
| 565 | |
| 566 | if (first) { |
| 567 | if (pch_i2c_wait_for_bus_idle(adap, BUS_IDLE_TIMEOUT) == -ETIME) |
| 568 | return -ETIME; |
| 569 | } |
| 570 | |
| 571 | if (msgs->flags & I2C_M_TEN) { |
Tomoya MORINAGA | c249ac2 | 2011-10-12 13:13:02 +0900 | [diff] [blame] | 572 | addr_2_msb = ((addr & I2C_MSB_2B_MSK) >> 7); |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 573 | iowrite32(addr_2_msb | TEN_BIT_ADDR_MASK, p + PCH_I2CDR); |
Tomoya MORINAGA | c249ac2 | 2011-10-12 13:13:02 +0900 | [diff] [blame] | 574 | if (first) |
| 575 | pch_i2c_start(adap); |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 576 | |
Tomoya MORINAGA | c249ac2 | 2011-10-12 13:13:02 +0900 | [diff] [blame] | 577 | rtn = pch_i2c_wait_for_xfer_complete(adap); |
| 578 | if (rtn == 0) { |
| 579 | if (pch_i2c_getack(adap)) { |
| 580 | pch_dbg(adap, "Receive NACK for slave address" |
| 581 | "setting\n"); |
| 582 | return -EIO; |
| 583 | } |
| 584 | addr_8_lsb = (addr & I2C_ADDR_MSK); |
| 585 | iowrite32(addr_8_lsb, p + PCH_I2CDR); |
| 586 | } else if (rtn == -EIO) { /* Arbitration Lost */ |
| 587 | pch_err(adap, "Lost Arbitration\n"); |
| 588 | pch_clrbit(adap->pch_base_address, PCH_I2CSR, |
| 589 | I2CMAL_BIT); |
| 590 | pch_clrbit(adap->pch_base_address, PCH_I2CSR, |
| 591 | I2CMIF_BIT); |
| 592 | pch_i2c_init(adap); |
| 593 | return -EAGAIN; |
| 594 | } else { /* wait-event timeout */ |
| 595 | pch_i2c_stop(adap); |
| 596 | return -ETIME; |
| 597 | } |
| 598 | pch_i2c_restart(adap); |
| 599 | rtn = pch_i2c_wait_for_xfer_complete(adap); |
| 600 | if (rtn == 0) { |
| 601 | if (pch_i2c_getack(adap)) { |
| 602 | pch_dbg(adap, "Receive NACK for slave address" |
| 603 | "setting\n"); |
| 604 | return -EIO; |
| 605 | } |
| 606 | addr_2_msb |= I2C_RD; |
| 607 | iowrite32(addr_2_msb | TEN_BIT_ADDR_MASK, |
| 608 | p + PCH_I2CDR); |
| 609 | } else if (rtn == -EIO) { /* Arbitration Lost */ |
| 610 | pch_err(adap, "Lost Arbitration\n"); |
| 611 | pch_clrbit(adap->pch_base_address, PCH_I2CSR, |
| 612 | I2CMAL_BIT); |
| 613 | pch_clrbit(adap->pch_base_address, PCH_I2CSR, |
| 614 | I2CMIF_BIT); |
| 615 | pch_i2c_init(adap); |
| 616 | return -EAGAIN; |
| 617 | } else { /* wait-event timeout */ |
| 618 | pch_i2c_stop(adap); |
| 619 | return -ETIME; |
| 620 | } |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 621 | } else { |
| 622 | /* 7 address bits + R/W bit */ |
| 623 | addr = (((addr) << 1) | (I2C_RD)); |
| 624 | iowrite32(addr, p + PCH_I2CDR); |
| 625 | } |
| 626 | |
| 627 | /* check if it is the first message */ |
| 628 | if (first) |
| 629 | pch_i2c_start(adap); |
| 630 | |
Tomoya MORINAGA | 12bd314 | 2011-10-12 13:13:03 +0900 | [diff] [blame] | 631 | rtn = pch_i2c_wait_for_xfer_complete(adap); |
| 632 | if (rtn == 0) { |
| 633 | if (pch_i2c_getack(adap)) { |
| 634 | pch_dbg(adap, "Receive NACK for slave address" |
| 635 | "setting\n"); |
| 636 | return -EIO; |
| 637 | } |
| 638 | } else if (rtn == -EIO) { /* Arbitration Lost */ |
| 639 | pch_err(adap, "Lost Arbitration\n"); |
| 640 | pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMAL_BIT); |
| 641 | pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMIF_BIT); |
Tomoya MORINAGA | 24597bf | 2011-10-12 13:13:06 +0900 | [diff] [blame] | 642 | pch_i2c_init(adap); |
Tomoya MORINAGA | 12bd314 | 2011-10-12 13:13:03 +0900 | [diff] [blame] | 643 | return -EAGAIN; |
| 644 | } else { /* wait-event timeout */ |
Tomoya MORINAGA | 3cf21a7 | 2011-10-12 13:13:04 +0900 | [diff] [blame] | 645 | pch_i2c_stop(adap); |
Tomoya MORINAGA | 12bd314 | 2011-10-12 13:13:03 +0900 | [diff] [blame] | 646 | return -ETIME; |
| 647 | } |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 648 | |
Tomoya MORINAGA | 12bd314 | 2011-10-12 13:13:03 +0900 | [diff] [blame] | 649 | if (length == 0) { |
| 650 | pch_i2c_stop(adap); |
| 651 | ioread32(p + PCH_I2CDR); /* Dummy read needs */ |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 652 | |
Tomoya MORINAGA | 12bd314 | 2011-10-12 13:13:03 +0900 | [diff] [blame] | 653 | count = length; |
| 654 | } else { |
| 655 | int read_index; |
| 656 | int loop; |
| 657 | pch_i2c_sendack(adap); |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 658 | |
Tomoya MORINAGA | 12bd314 | 2011-10-12 13:13:03 +0900 | [diff] [blame] | 659 | /* Dummy read */ |
| 660 | for (loop = 1, read_index = 0; loop < length; loop++) { |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 661 | buf[read_index] = ioread32(p + PCH_I2CDR); |
| 662 | |
Tomoya MORINAGA | 12bd314 | 2011-10-12 13:13:03 +0900 | [diff] [blame] | 663 | if (loop != 1) |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 664 | read_index++; |
| 665 | |
Tomoya MORINAGA | 12bd314 | 2011-10-12 13:13:03 +0900 | [diff] [blame] | 666 | rtn = pch_i2c_wait_for_xfer_complete(adap); |
| 667 | if (rtn == 0) { |
| 668 | if (pch_i2c_getack(adap)) { |
| 669 | pch_dbg(adap, "Receive NACK for slave" |
| 670 | "address setting\n"); |
| 671 | return -EIO; |
| 672 | } |
| 673 | } else { /* wait-event timeout */ |
| 674 | pch_i2c_stop(adap); |
| 675 | return -ETIME; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 676 | } |
| 677 | |
Tomoya MORINAGA | 12bd314 | 2011-10-12 13:13:03 +0900 | [diff] [blame] | 678 | } /* end for */ |
| 679 | |
| 680 | pch_i2c_sendnack(adap); |
| 681 | |
| 682 | buf[read_index] = ioread32(p + PCH_I2CDR); /* Read final - 1 */ |
| 683 | |
| 684 | if (length != 1) |
| 685 | read_index++; |
| 686 | |
| 687 | rtn = pch_i2c_wait_for_xfer_complete(adap); |
| 688 | if (rtn == 0) { |
| 689 | if (pch_i2c_getack(adap)) { |
| 690 | pch_dbg(adap, "Receive NACK for slave" |
| 691 | "address setting\n"); |
| 692 | return -EIO; |
| 693 | } |
| 694 | } else { /* wait-event timeout */ |
| 695 | pch_i2c_stop(adap); |
| 696 | return -ETIME; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 697 | } |
Tomoya MORINAGA | 12bd314 | 2011-10-12 13:13:03 +0900 | [diff] [blame] | 698 | |
| 699 | if (last) |
| 700 | pch_i2c_stop(adap); |
| 701 | else |
| 702 | pch_i2c_repstart(adap); |
| 703 | |
| 704 | buf[read_index++] = ioread32(p + PCH_I2CDR); /* Read Final */ |
| 705 | count = read_index; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 706 | } |
| 707 | |
| 708 | return count; |
| 709 | } |
| 710 | |
| 711 | /** |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 712 | * pch_i2c_cb() - Interrupt handler Call back function |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 713 | * @adap: Pointer to struct i2c_algo_pch_data. |
| 714 | */ |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 715 | static void pch_i2c_cb(struct i2c_algo_pch_data *adap) |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 716 | { |
| 717 | u32 sts; |
| 718 | void __iomem *p = adap->pch_base_address; |
| 719 | |
| 720 | sts = ioread32(p + PCH_I2CSR); |
| 721 | sts &= (I2CMAL_BIT | I2CMCF_BIT | I2CMIF_BIT); |
| 722 | if (sts & I2CMAL_BIT) |
| 723 | adap->pch_event_flag |= I2CMAL_EVENT; |
| 724 | |
| 725 | if (sts & I2CMCF_BIT) |
| 726 | adap->pch_event_flag |= I2CMCF_EVENT; |
| 727 | |
| 728 | /* clear the applicable bits */ |
| 729 | pch_clrbit(adap->pch_base_address, PCH_I2CSR, sts); |
| 730 | |
| 731 | pch_dbg(adap, "PCH_I2CSR = %x\n", ioread32(p + PCH_I2CSR)); |
| 732 | |
| 733 | wake_up(&pch_event); |
| 734 | } |
| 735 | |
| 736 | /** |
| 737 | * pch_i2c_handler() - interrupt handler for the PCH I2C controller |
| 738 | * @irq: irq number. |
| 739 | * @pData: cookie passed back to the handler function. |
| 740 | */ |
| 741 | static irqreturn_t pch_i2c_handler(int irq, void *pData) |
| 742 | { |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 743 | u32 reg_val; |
| 744 | int flag; |
| 745 | int i; |
| 746 | struct adapter_info *adap_info = pData; |
| 747 | void __iomem *p; |
| 748 | u32 mode; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 749 | |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 750 | for (i = 0, flag = 0; i < adap_info->ch_num; i++) { |
| 751 | p = adap_info->pch_data[i].pch_base_address; |
| 752 | mode = ioread32(p + PCH_I2CMOD); |
| 753 | mode &= BUFFER_MODE | EEPROM_SR_MODE; |
| 754 | if (mode != NORMAL_MODE) { |
| 755 | pch_err(adap_info->pch_data, |
| 756 | "I2C-%d mode(%d) is not supported\n", mode, i); |
| 757 | continue; |
| 758 | } |
| 759 | reg_val = ioread32(p + PCH_I2CSR); |
| 760 | if (reg_val & (I2CMAL_BIT | I2CMCF_BIT | I2CMIF_BIT)) { |
| 761 | pch_i2c_cb(&adap_info->pch_data[i]); |
| 762 | flag = 1; |
| 763 | } |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 764 | } |
| 765 | |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 766 | return flag ? IRQ_HANDLED : IRQ_NONE; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 767 | } |
| 768 | |
| 769 | /** |
| 770 | * pch_i2c_xfer() - Reading adnd writing data through I2C bus |
| 771 | * @i2c_adap: Pointer to the struct i2c_adapter. |
| 772 | * @msgs: Pointer to i2c_msg structure. |
| 773 | * @num: number of messages. |
| 774 | */ |
| 775 | static s32 pch_i2c_xfer(struct i2c_adapter *i2c_adap, |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 776 | struct i2c_msg *msgs, s32 num) |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 777 | { |
| 778 | struct i2c_msg *pmsg; |
| 779 | u32 i = 0; |
| 780 | u32 status; |
| 781 | u32 msglen; |
| 782 | u32 subaddrlen; |
| 783 | s32 ret; |
| 784 | |
| 785 | struct i2c_algo_pch_data *adap = i2c_adap->algo_data; |
| 786 | |
| 787 | ret = mutex_lock_interruptible(&pch_mutex); |
| 788 | if (ret) |
| 789 | return -ERESTARTSYS; |
| 790 | |
| 791 | if (adap->p_adapter_info->pch_i2c_suspended) { |
| 792 | mutex_unlock(&pch_mutex); |
| 793 | return -EBUSY; |
| 794 | } |
| 795 | |
| 796 | pch_dbg(adap, "adap->p_adapter_info->pch_i2c_suspended is %d\n", |
| 797 | adap->p_adapter_info->pch_i2c_suspended); |
| 798 | /* transfer not completed */ |
| 799 | adap->pch_i2c_xfer_in_progress = true; |
| 800 | |
Tomoya MORINAGA | 07e729c | 2011-06-23 16:17:10 +0900 | [diff] [blame] | 801 | for (i = 0; i < num && ret >= 0; i++) { |
Tomoya MORINAGA | 7a9c42c | 2011-06-09 11:29:29 +0900 | [diff] [blame] | 802 | pmsg = &msgs[i]; |
| 803 | pmsg->flags |= adap->pch_buff_mode_en; |
| 804 | status = pmsg->flags; |
| 805 | pch_dbg(adap, |
| 806 | "After invoking I2C_MODE_SEL :flag= 0x%x\n", status); |
| 807 | /* calculate sub address length and message length */ |
| 808 | /* these are applicable only for buffer mode */ |
| 809 | subaddrlen = pmsg->buf[0]; |
| 810 | /* calculate actual message length excluding |
| 811 | * the sub address fields */ |
| 812 | msglen = (pmsg->len) - (subaddrlen + 1); |
| 813 | |
| 814 | if ((status & (I2C_M_RD)) != false) { |
| 815 | ret = pch_i2c_readbytes(i2c_adap, pmsg, (i + 1 == num), |
| 816 | (i == 0)); |
| 817 | } else { |
| 818 | ret = pch_i2c_writebytes(i2c_adap, pmsg, (i + 1 == num), |
| 819 | (i == 0)); |
| 820 | } |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 821 | } |
| 822 | |
| 823 | adap->pch_i2c_xfer_in_progress = false; /* transfer completed */ |
| 824 | |
| 825 | mutex_unlock(&pch_mutex); |
| 826 | |
Tomoya MORINAGA | 07e729c | 2011-06-23 16:17:10 +0900 | [diff] [blame] | 827 | return (ret < 0) ? ret : num; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 828 | } |
| 829 | |
| 830 | /** |
| 831 | * pch_i2c_func() - return the functionality of the I2C driver |
| 832 | * @adap: Pointer to struct i2c_algo_pch_data. |
| 833 | */ |
| 834 | static u32 pch_i2c_func(struct i2c_adapter *adap) |
| 835 | { |
| 836 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR; |
| 837 | } |
| 838 | |
| 839 | static struct i2c_algorithm pch_algorithm = { |
| 840 | .master_xfer = pch_i2c_xfer, |
| 841 | .functionality = pch_i2c_func |
| 842 | }; |
| 843 | |
| 844 | /** |
| 845 | * pch_i2c_disbl_int() - Disable PCH I2C interrupts |
| 846 | * @adap: Pointer to struct i2c_algo_pch_data. |
| 847 | */ |
| 848 | static void pch_i2c_disbl_int(struct i2c_algo_pch_data *adap) |
| 849 | { |
| 850 | void __iomem *p = adap->pch_base_address; |
| 851 | |
| 852 | pch_clrbit(adap->pch_base_address, PCH_I2CCTL, NORMAL_INTR_ENBL); |
| 853 | |
| 854 | iowrite32(EEPROM_RST_INTR_DISBL, p + PCH_I2CESRMSK); |
| 855 | |
| 856 | iowrite32(BUFFER_MODE_INTR_DISBL, p + PCH_I2CBUFMSK); |
| 857 | } |
| 858 | |
| 859 | static int __devinit pch_i2c_probe(struct pci_dev *pdev, |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 860 | const struct pci_device_id *id) |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 861 | { |
| 862 | void __iomem *base_addr; |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 863 | int ret; |
| 864 | int i, j; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 865 | struct adapter_info *adap_info; |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 866 | struct i2c_adapter *pch_adap; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 867 | |
| 868 | pch_pci_dbg(pdev, "Entered.\n"); |
| 869 | |
| 870 | adap_info = kzalloc((sizeof(struct adapter_info)), GFP_KERNEL); |
| 871 | if (adap_info == NULL) { |
| 872 | pch_pci_err(pdev, "Memory allocation FAILED\n"); |
| 873 | return -ENOMEM; |
| 874 | } |
| 875 | |
| 876 | ret = pci_enable_device(pdev); |
| 877 | if (ret) { |
| 878 | pch_pci_err(pdev, "pci_enable_device FAILED\n"); |
| 879 | goto err_pci_enable; |
| 880 | } |
| 881 | |
| 882 | ret = pci_request_regions(pdev, KBUILD_MODNAME); |
| 883 | if (ret) { |
| 884 | pch_pci_err(pdev, "pci_request_regions FAILED\n"); |
| 885 | goto err_pci_req; |
| 886 | } |
| 887 | |
| 888 | base_addr = pci_iomap(pdev, 1, 0); |
| 889 | |
| 890 | if (base_addr == NULL) { |
| 891 | pch_pci_err(pdev, "pci_iomap FAILED\n"); |
| 892 | ret = -ENOMEM; |
| 893 | goto err_pci_iomap; |
| 894 | } |
| 895 | |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 896 | /* Set the number of I2C channel instance */ |
| 897 | adap_info->ch_num = id->driver_data; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 898 | |
Feng Tang | 0d5fb5e | 2011-11-29 15:19:10 +0800 | [diff] [blame] | 899 | ret = request_irq(pdev->irq, pch_i2c_handler, IRQF_SHARED, |
| 900 | KBUILD_MODNAME, adap_info); |
| 901 | if (ret) { |
| 902 | pch_pci_err(pdev, "request_irq FAILED\n"); |
| 903 | goto err_request_irq; |
| 904 | } |
| 905 | |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 906 | for (i = 0; i < adap_info->ch_num; i++) { |
| 907 | pch_adap = &adap_info->pch_data[i].pch_adapter; |
| 908 | adap_info->pch_i2c_suspended = false; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 909 | |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 910 | adap_info->pch_data[i].p_adapter_info = adap_info; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 911 | |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 912 | pch_adap->owner = THIS_MODULE; |
| 913 | pch_adap->class = I2C_CLASS_HWMON; |
| 914 | strcpy(pch_adap->name, KBUILD_MODNAME); |
| 915 | pch_adap->algo = &pch_algorithm; |
| 916 | pch_adap->algo_data = &adap_info->pch_data[i]; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 917 | |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 918 | /* base_addr + offset; */ |
| 919 | adap_info->pch_data[i].pch_base_address = base_addr + 0x100 * i; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 920 | |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 921 | pch_adap->dev.parent = &pdev->dev; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 922 | |
Feng Tang | 0d5fb5e | 2011-11-29 15:19:10 +0800 | [diff] [blame] | 923 | pch_i2c_init(&adap_info->pch_data[i]); |
Feng Tang | 07e8a51 | 2012-01-12 15:38:02 +0800 | [diff] [blame] | 924 | |
| 925 | pch_adap->nr = i; |
| 926 | ret = i2c_add_numbered_adapter(pch_adap); |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 927 | if (ret) { |
| 928 | pch_pci_err(pdev, "i2c_add_adapter[ch:%d] FAILED\n", i); |
Feng Tang | 0d5fb5e | 2011-11-29 15:19:10 +0800 | [diff] [blame] | 929 | goto err_add_adapter; |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 930 | } |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 931 | } |
| 932 | |
| 933 | pci_set_drvdata(pdev, adap_info); |
| 934 | pch_pci_dbg(pdev, "returns %d.\n", ret); |
| 935 | return 0; |
| 936 | |
Feng Tang | 0d5fb5e | 2011-11-29 15:19:10 +0800 | [diff] [blame] | 937 | err_add_adapter: |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 938 | for (j = 0; j < i; j++) |
| 939 | i2c_del_adapter(&adap_info->pch_data[j].pch_adapter); |
Feng Tang | 0d5fb5e | 2011-11-29 15:19:10 +0800 | [diff] [blame] | 940 | free_irq(pdev->irq, adap_info); |
| 941 | err_request_irq: |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 942 | pci_iounmap(pdev, base_addr); |
| 943 | err_pci_iomap: |
| 944 | pci_release_regions(pdev); |
| 945 | err_pci_req: |
| 946 | pci_disable_device(pdev); |
| 947 | err_pci_enable: |
| 948 | kfree(adap_info); |
| 949 | return ret; |
| 950 | } |
| 951 | |
| 952 | static void __devexit pch_i2c_remove(struct pci_dev *pdev) |
| 953 | { |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 954 | int i; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 955 | struct adapter_info *adap_info = pci_get_drvdata(pdev); |
| 956 | |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 957 | free_irq(pdev->irq, adap_info); |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 958 | |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 959 | for (i = 0; i < adap_info->ch_num; i++) { |
| 960 | pch_i2c_disbl_int(&adap_info->pch_data[i]); |
| 961 | i2c_del_adapter(&adap_info->pch_data[i].pch_adapter); |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 962 | } |
| 963 | |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 964 | if (adap_info->pch_data[0].pch_base_address) |
| 965 | pci_iounmap(pdev, adap_info->pch_data[0].pch_base_address); |
| 966 | |
| 967 | for (i = 0; i < adap_info->ch_num; i++) |
| 968 | adap_info->pch_data[i].pch_base_address = 0; |
| 969 | |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 970 | pci_set_drvdata(pdev, NULL); |
| 971 | |
| 972 | pci_release_regions(pdev); |
| 973 | |
| 974 | pci_disable_device(pdev); |
| 975 | kfree(adap_info); |
| 976 | } |
| 977 | |
| 978 | #ifdef CONFIG_PM |
| 979 | static int pch_i2c_suspend(struct pci_dev *pdev, pm_message_t state) |
| 980 | { |
| 981 | int ret; |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 982 | int i; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 983 | struct adapter_info *adap_info = pci_get_drvdata(pdev); |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 984 | void __iomem *p = adap_info->pch_data[0].pch_base_address; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 985 | |
| 986 | adap_info->pch_i2c_suspended = true; |
| 987 | |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 988 | for (i = 0; i < adap_info->ch_num; i++) { |
| 989 | while ((adap_info->pch_data[i].pch_i2c_xfer_in_progress)) { |
| 990 | /* Wait until all channel transfers are completed */ |
| 991 | msleep(20); |
| 992 | } |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 993 | } |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 994 | |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 995 | /* Disable the i2c interrupts */ |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 996 | for (i = 0; i < adap_info->ch_num; i++) |
| 997 | pch_i2c_disbl_int(&adap_info->pch_data[i]); |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 998 | |
| 999 | pch_pci_dbg(pdev, "I2CSR = %x I2CBUFSTA = %x I2CESRSTA = %x " |
| 1000 | "invoked function pch_i2c_disbl_int successfully\n", |
| 1001 | ioread32(p + PCH_I2CSR), ioread32(p + PCH_I2CBUFSTA), |
| 1002 | ioread32(p + PCH_I2CESRSTA)); |
| 1003 | |
| 1004 | ret = pci_save_state(pdev); |
| 1005 | |
| 1006 | if (ret) { |
| 1007 | pch_pci_err(pdev, "pci_save_state\n"); |
| 1008 | return ret; |
| 1009 | } |
| 1010 | |
| 1011 | pci_enable_wake(pdev, PCI_D3hot, 0); |
| 1012 | pci_disable_device(pdev); |
| 1013 | pci_set_power_state(pdev, pci_choose_state(pdev, state)); |
| 1014 | |
| 1015 | return 0; |
| 1016 | } |
| 1017 | |
| 1018 | static int pch_i2c_resume(struct pci_dev *pdev) |
| 1019 | { |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 1020 | int i; |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 1021 | struct adapter_info *adap_info = pci_get_drvdata(pdev); |
| 1022 | |
| 1023 | pci_set_power_state(pdev, PCI_D0); |
| 1024 | pci_restore_state(pdev); |
| 1025 | |
| 1026 | if (pci_enable_device(pdev) < 0) { |
| 1027 | pch_pci_err(pdev, "pch_i2c_resume:pci_enable_device FAILED\n"); |
| 1028 | return -EIO; |
| 1029 | } |
| 1030 | |
| 1031 | pci_enable_wake(pdev, PCI_D3hot, 0); |
| 1032 | |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 1033 | for (i = 0; i < adap_info->ch_num; i++) |
| 1034 | pch_i2c_init(&adap_info->pch_data[i]); |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 1035 | |
| 1036 | adap_info->pch_i2c_suspended = false; |
| 1037 | |
| 1038 | return 0; |
| 1039 | } |
| 1040 | #else |
| 1041 | #define pch_i2c_suspend NULL |
| 1042 | #define pch_i2c_resume NULL |
| 1043 | #endif |
| 1044 | |
| 1045 | static struct pci_driver pch_pcidriver = { |
| 1046 | .name = KBUILD_MODNAME, |
| 1047 | .id_table = pch_pcidev_id, |
| 1048 | .probe = pch_i2c_probe, |
| 1049 | .remove = __devexit_p(pch_i2c_remove), |
| 1050 | .suspend = pch_i2c_suspend, |
| 1051 | .resume = pch_i2c_resume |
| 1052 | }; |
| 1053 | |
| 1054 | static int __init pch_pci_init(void) |
| 1055 | { |
| 1056 | return pci_register_driver(&pch_pcidriver); |
| 1057 | } |
| 1058 | module_init(pch_pci_init); |
| 1059 | |
| 1060 | static void __exit pch_pci_exit(void) |
| 1061 | { |
| 1062 | pci_unregister_driver(&pch_pcidriver); |
| 1063 | } |
| 1064 | module_exit(pch_pci_exit); |
| 1065 | |
Tomoya MORINAGA | 173442f | 2011-03-01 14:16:23 +0900 | [diff] [blame] | 1066 | MODULE_DESCRIPTION("Intel EG20T PCH/OKI SEMICONDUCTOR ML7213 IOH I2C Driver"); |
Tomoya MORINAGA | e9bc8fa | 2010-11-09 13:25:22 +0900 | [diff] [blame] | 1067 | MODULE_LICENSE("GPL"); |
| 1068 | MODULE_AUTHOR("Tomoya MORINAGA. <tomoya-linux@dsn.okisemi.com>"); |
| 1069 | module_param(pch_i2c_speed, int, (S_IRUSR | S_IWUSR)); |
| 1070 | module_param(pch_clk, int, (S_IRUSR | S_IWUSR)); |