Dirk Brandewie | fe20ff5 | 2011-10-06 11:26:35 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Synopsys DesignWare I2C adapter driver (master only). |
| 3 | * |
| 4 | * Based on the TI DAVINCI I2C adapter driver. |
| 5 | * |
| 6 | * Copyright (C) 2006 Texas Instruments. |
| 7 | * Copyright (C) 2007 MontaVista Software Inc. |
| 8 | * Copyright (C) 2009 Provigent Ltd. |
| 9 | * Copyright (C) 2011 Intel corporation. |
| 10 | * |
| 11 | * ---------------------------------------------------------------------------- |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or modify |
| 14 | * it under the terms of the GNU General Public License as published by |
| 15 | * the Free Software Foundation; either version 2 of the License, or |
| 16 | * (at your option) any later version. |
| 17 | * |
| 18 | * This program is distributed in the hope that it will be useful, |
| 19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 21 | * GNU General Public License for more details. |
| 22 | * |
| 23 | * You should have received a copy of the GNU General Public License |
| 24 | * along with this program; if not, write to the Free Software |
| 25 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 26 | * ---------------------------------------------------------------------------- |
| 27 | * |
| 28 | */ |
| 29 | |
| 30 | #include <linux/kernel.h> |
| 31 | #include <linux/module.h> |
| 32 | #include <linux/delay.h> |
| 33 | #include <linux/i2c.h> |
| 34 | #include <linux/errno.h> |
| 35 | #include <linux/sched.h> |
| 36 | #include <linux/err.h> |
| 37 | #include <linux/interrupt.h> |
| 38 | #include <linux/io.h> |
| 39 | #include <linux/slab.h> |
| 40 | #include <linux/pci.h> |
Dirk Brandewie | 18dbdda | 2011-10-06 11:26:36 -0700 | [diff] [blame] | 41 | #include <linux/pm_runtime.h> |
Dirk Brandewie | fe20ff5 | 2011-10-06 11:26:35 -0700 | [diff] [blame] | 42 | #include "i2c-designware-core.h" |
| 43 | |
| 44 | #define DRIVER_NAME "i2c-designware-pci" |
| 45 | |
| 46 | enum dw_pci_ctl_id_t { |
| 47 | moorestown_0, |
| 48 | moorestown_1, |
| 49 | moorestown_2, |
| 50 | |
| 51 | medfield_0, |
| 52 | medfield_1, |
| 53 | medfield_2, |
| 54 | medfield_3, |
| 55 | medfield_4, |
| 56 | medfield_5, |
| 57 | }; |
| 58 | |
| 59 | struct dw_pci_controller { |
| 60 | u32 bus_num; |
| 61 | u32 bus_cfg; |
| 62 | u32 tx_fifo_depth; |
| 63 | u32 rx_fifo_depth; |
| 64 | u32 clk_khz; |
| 65 | }; |
| 66 | |
| 67 | #define INTEL_MID_STD_CFG (DW_IC_CON_MASTER | \ |
| 68 | DW_IC_CON_SLAVE_DISABLE | \ |
| 69 | DW_IC_CON_RESTART_EN) |
| 70 | |
| 71 | static struct dw_pci_controller dw_pci_controllers[] = { |
| 72 | [moorestown_0] = { |
| 73 | .bus_num = 0, |
| 74 | .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST, |
| 75 | .tx_fifo_depth = 32, |
| 76 | .rx_fifo_depth = 32, |
| 77 | .clk_khz = 25000, |
| 78 | }, |
| 79 | [moorestown_1] = { |
| 80 | .bus_num = 1, |
| 81 | .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST, |
| 82 | .tx_fifo_depth = 32, |
| 83 | .rx_fifo_depth = 32, |
| 84 | .clk_khz = 25000, |
| 85 | }, |
| 86 | [moorestown_2] = { |
| 87 | .bus_num = 2, |
| 88 | .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST, |
| 89 | .tx_fifo_depth = 32, |
| 90 | .rx_fifo_depth = 32, |
| 91 | .clk_khz = 25000, |
| 92 | }, |
| 93 | [medfield_0] = { |
| 94 | .bus_num = 0, |
| 95 | .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST, |
| 96 | .tx_fifo_depth = 32, |
| 97 | .rx_fifo_depth = 32, |
| 98 | .clk_khz = 25000, |
| 99 | }, |
| 100 | [medfield_1] = { |
| 101 | .bus_num = 1, |
| 102 | .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST, |
| 103 | .tx_fifo_depth = 32, |
| 104 | .rx_fifo_depth = 32, |
| 105 | .clk_khz = 25000, |
| 106 | }, |
| 107 | [medfield_2] = { |
| 108 | .bus_num = 2, |
| 109 | .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST, |
| 110 | .tx_fifo_depth = 32, |
| 111 | .rx_fifo_depth = 32, |
| 112 | .clk_khz = 25000, |
| 113 | }, |
| 114 | [medfield_3] = { |
| 115 | .bus_num = 3, |
| 116 | .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_STD, |
| 117 | .tx_fifo_depth = 32, |
| 118 | .rx_fifo_depth = 32, |
| 119 | .clk_khz = 25000, |
| 120 | }, |
| 121 | [medfield_4] = { |
| 122 | .bus_num = 4, |
| 123 | .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST, |
| 124 | .tx_fifo_depth = 32, |
| 125 | .rx_fifo_depth = 32, |
| 126 | .clk_khz = 25000, |
| 127 | }, |
| 128 | [medfield_5] = { |
| 129 | .bus_num = 5, |
| 130 | .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST, |
| 131 | .tx_fifo_depth = 32, |
| 132 | .rx_fifo_depth = 32, |
| 133 | .clk_khz = 25000, |
| 134 | }, |
| 135 | }; |
| 136 | static struct i2c_algorithm i2c_dw_algo = { |
| 137 | .master_xfer = i2c_dw_xfer, |
| 138 | .functionality = i2c_dw_func, |
| 139 | }; |
| 140 | |
Octavian Purdila | 52c2843 | 2011-10-06 11:26:37 -0700 | [diff] [blame] | 141 | static int i2c_dw_pci_suspend(struct device *dev) |
Dirk Brandewie | 18dbdda | 2011-10-06 11:26:36 -0700 | [diff] [blame] | 142 | { |
Octavian Purdila | 52c2843 | 2011-10-06 11:26:37 -0700 | [diff] [blame] | 143 | struct pci_dev *pdev = container_of(dev, struct pci_dev, dev); |
Dirk Brandewie | 18dbdda | 2011-10-06 11:26:36 -0700 | [diff] [blame] | 144 | struct dw_i2c_dev *i2c = pci_get_drvdata(pdev); |
| 145 | int err; |
| 146 | |
| 147 | |
| 148 | i2c_dw_disable(i2c); |
| 149 | |
| 150 | err = pci_save_state(pdev); |
| 151 | if (err) { |
| 152 | dev_err(&pdev->dev, "pci_save_state failed\n"); |
| 153 | return err; |
| 154 | } |
| 155 | |
| 156 | err = pci_set_power_state(pdev, PCI_D3hot); |
| 157 | if (err) { |
| 158 | dev_err(&pdev->dev, "pci_set_power_state failed\n"); |
| 159 | return err; |
| 160 | } |
| 161 | |
| 162 | return 0; |
| 163 | } |
| 164 | |
Octavian Purdila | 52c2843 | 2011-10-06 11:26:37 -0700 | [diff] [blame] | 165 | static int i2c_dw_pci_resume(struct device *dev) |
Dirk Brandewie | 18dbdda | 2011-10-06 11:26:36 -0700 | [diff] [blame] | 166 | { |
Octavian Purdila | 52c2843 | 2011-10-06 11:26:37 -0700 | [diff] [blame] | 167 | struct pci_dev *pdev = container_of(dev, struct pci_dev, dev); |
Dirk Brandewie | 18dbdda | 2011-10-06 11:26:36 -0700 | [diff] [blame] | 168 | struct dw_i2c_dev *i2c = pci_get_drvdata(pdev); |
| 169 | int err; |
| 170 | u32 enabled; |
| 171 | |
| 172 | enabled = i2c_dw_is_enabled(i2c); |
| 173 | if (enabled) |
| 174 | return 0; |
| 175 | |
| 176 | err = pci_set_power_state(pdev, PCI_D0); |
| 177 | if (err) { |
| 178 | dev_err(&pdev->dev, "pci_set_power_state() failed\n"); |
| 179 | return err; |
| 180 | } |
| 181 | |
| 182 | pci_restore_state(pdev); |
| 183 | |
| 184 | i2c_dw_init(i2c); |
Dirk Brandewie | 18dbdda | 2011-10-06 11:26:36 -0700 | [diff] [blame] | 185 | return 0; |
| 186 | } |
| 187 | |
Dirk Brandewie | 18dbdda | 2011-10-06 11:26:36 -0700 | [diff] [blame] | 188 | static int i2c_dw_pci_runtime_idle(struct device *dev) |
| 189 | { |
| 190 | int err = pm_schedule_suspend(dev, 500); |
| 191 | dev_dbg(dev, "runtime_idle called\n"); |
| 192 | |
| 193 | if (err != 0) |
| 194 | return 0; |
| 195 | return -EBUSY; |
| 196 | } |
| 197 | |
| 198 | static const struct dev_pm_ops i2c_dw_pm_ops = { |
Octavian Purdila | 52c2843 | 2011-10-06 11:26:37 -0700 | [diff] [blame] | 199 | .resume = i2c_dw_pci_resume, |
| 200 | .suspend = i2c_dw_pci_suspend, |
| 201 | SET_RUNTIME_PM_OPS(i2c_dw_pci_suspend, i2c_dw_pci_resume, |
| 202 | i2c_dw_pci_runtime_idle) |
Dirk Brandewie | 18dbdda | 2011-10-06 11:26:36 -0700 | [diff] [blame] | 203 | }; |
| 204 | |
Dirk Brandewie | fe20ff5 | 2011-10-06 11:26:35 -0700 | [diff] [blame] | 205 | static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev) |
| 206 | { |
| 207 | return dev->controller->clk_khz; |
| 208 | } |
| 209 | |
| 210 | static int __devinit i2c_dw_pci_probe(struct pci_dev *pdev, |
| 211 | const struct pci_device_id *id) |
| 212 | { |
| 213 | struct dw_i2c_dev *dev; |
| 214 | struct i2c_adapter *adap; |
| 215 | unsigned long start, len; |
| 216 | void __iomem *base; |
| 217 | int r; |
| 218 | struct dw_pci_controller *controller; |
| 219 | |
| 220 | if (id->driver_data >= ARRAY_SIZE(dw_pci_controllers)) { |
| 221 | printk(KERN_ERR "dw_i2c_pci_probe: invalid driver data %ld\n", |
| 222 | id->driver_data); |
| 223 | return -EINVAL; |
| 224 | } |
| 225 | |
| 226 | controller = &dw_pci_controllers[id->driver_data]; |
| 227 | |
| 228 | r = pci_enable_device(pdev); |
| 229 | if (r) { |
| 230 | dev_err(&pdev->dev, "Failed to enable I2C PCI device (%d)\n", |
| 231 | r); |
| 232 | goto exit; |
| 233 | } |
| 234 | |
| 235 | /* Determine the address of the I2C area */ |
| 236 | start = pci_resource_start(pdev, 0); |
| 237 | len = pci_resource_len(pdev, 0); |
| 238 | if (!start || len == 0) { |
| 239 | dev_err(&pdev->dev, "base address not set\n"); |
| 240 | r = -ENODEV; |
| 241 | goto exit; |
| 242 | } |
| 243 | |
| 244 | r = pci_request_region(pdev, 0, DRIVER_NAME); |
| 245 | if (r) { |
| 246 | dev_err(&pdev->dev, "failed to request I2C region " |
| 247 | "0x%lx-0x%lx\n", start, |
| 248 | (unsigned long)pci_resource_end(pdev, 0)); |
| 249 | goto exit; |
| 250 | } |
| 251 | |
| 252 | base = ioremap_nocache(start, len); |
| 253 | if (!base) { |
| 254 | dev_err(&pdev->dev, "I/O memory remapping failed\n"); |
| 255 | r = -ENOMEM; |
| 256 | goto err_release_region; |
| 257 | } |
| 258 | |
| 259 | |
| 260 | dev = kzalloc(sizeof(struct dw_i2c_dev), GFP_KERNEL); |
| 261 | if (!dev) { |
| 262 | r = -ENOMEM; |
| 263 | goto err_release_region; |
| 264 | } |
| 265 | |
| 266 | init_completion(&dev->cmd_complete); |
| 267 | mutex_init(&dev->lock); |
| 268 | dev->clk = NULL; |
| 269 | dev->controller = controller; |
| 270 | dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz; |
| 271 | dev->base = base; |
| 272 | dev->dev = get_device(&pdev->dev); |
| 273 | dev->functionality = |
| 274 | I2C_FUNC_I2C | |
| 275 | I2C_FUNC_SMBUS_BYTE | |
| 276 | I2C_FUNC_SMBUS_BYTE_DATA | |
| 277 | I2C_FUNC_SMBUS_WORD_DATA | |
| 278 | I2C_FUNC_SMBUS_I2C_BLOCK; |
| 279 | dev->master_cfg = controller->bus_cfg; |
| 280 | |
| 281 | pci_set_drvdata(pdev, dev); |
| 282 | |
| 283 | dev->tx_fifo_depth = controller->tx_fifo_depth; |
| 284 | dev->rx_fifo_depth = controller->rx_fifo_depth; |
| 285 | r = i2c_dw_init(dev); |
| 286 | if (r) |
| 287 | goto err_iounmap; |
| 288 | |
| 289 | adap = &dev->adapter; |
| 290 | i2c_set_adapdata(adap, dev); |
| 291 | adap->owner = THIS_MODULE; |
| 292 | adap->class = 0; |
| 293 | adap->algo = &i2c_dw_algo; |
| 294 | adap->dev.parent = &pdev->dev; |
| 295 | adap->nr = controller->bus_num; |
| 296 | snprintf(adap->name, sizeof(adap->name), "i2c-designware-pci-%d", |
| 297 | adap->nr); |
| 298 | |
| 299 | r = request_irq(pdev->irq, i2c_dw_isr, IRQF_SHARED, adap->name, dev); |
| 300 | if (r) { |
| 301 | dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq); |
| 302 | goto err_iounmap; |
| 303 | } |
| 304 | |
| 305 | i2c_dw_disable_int(dev); |
| 306 | i2c_dw_clear_int(dev); |
| 307 | r = i2c_add_numbered_adapter(adap); |
| 308 | if (r) { |
| 309 | dev_err(&pdev->dev, "failure adding adapter\n"); |
| 310 | goto err_free_irq; |
| 311 | } |
| 312 | |
Dirk Brandewie | 18dbdda | 2011-10-06 11:26:36 -0700 | [diff] [blame] | 313 | pm_runtime_put_noidle(&pdev->dev); |
| 314 | pm_runtime_allow(&pdev->dev); |
| 315 | |
Dirk Brandewie | fe20ff5 | 2011-10-06 11:26:35 -0700 | [diff] [blame] | 316 | return 0; |
| 317 | |
| 318 | err_free_irq: |
| 319 | free_irq(pdev->irq, dev); |
| 320 | err_iounmap: |
| 321 | iounmap(dev->base); |
| 322 | pci_set_drvdata(pdev, NULL); |
| 323 | put_device(&pdev->dev); |
| 324 | kfree(dev); |
| 325 | err_release_region: |
| 326 | pci_release_region(pdev, 0); |
| 327 | exit: |
| 328 | return r; |
| 329 | } |
| 330 | |
| 331 | static void __devexit i2c_dw_pci_remove(struct pci_dev *pdev) |
| 332 | { |
| 333 | struct dw_i2c_dev *dev = pci_get_drvdata(pdev); |
| 334 | |
Dirk Brandewie | 18dbdda | 2011-10-06 11:26:36 -0700 | [diff] [blame] | 335 | i2c_dw_disable(dev); |
| 336 | pm_runtime_forbid(&pdev->dev); |
| 337 | pm_runtime_get_noresume(&pdev->dev); |
| 338 | |
Dirk Brandewie | fe20ff5 | 2011-10-06 11:26:35 -0700 | [diff] [blame] | 339 | pci_set_drvdata(pdev, NULL); |
| 340 | i2c_del_adapter(&dev->adapter); |
| 341 | put_device(&pdev->dev); |
| 342 | |
| 343 | free_irq(dev->irq, dev); |
| 344 | kfree(dev); |
| 345 | pci_release_region(pdev, 0); |
| 346 | } |
| 347 | |
| 348 | /* work with hotplug and coldplug */ |
| 349 | MODULE_ALIAS("i2c_designware-pci"); |
| 350 | |
Axel Lin | 3527bd5 | 2012-01-12 20:32:04 +0100 | [diff] [blame] | 351 | static DEFINE_PCI_DEVICE_TABLE(i2_designware_pci_ids) = { |
Dirk Brandewie | fe20ff5 | 2011-10-06 11:26:35 -0700 | [diff] [blame] | 352 | /* Moorestown */ |
| 353 | { PCI_VDEVICE(INTEL, 0x0802), moorestown_0 }, |
| 354 | { PCI_VDEVICE(INTEL, 0x0803), moorestown_1 }, |
| 355 | { PCI_VDEVICE(INTEL, 0x0804), moorestown_2 }, |
| 356 | /* Medfield */ |
| 357 | { PCI_VDEVICE(INTEL, 0x0817), medfield_3,}, |
| 358 | { PCI_VDEVICE(INTEL, 0x0818), medfield_4 }, |
| 359 | { PCI_VDEVICE(INTEL, 0x0819), medfield_5 }, |
| 360 | { PCI_VDEVICE(INTEL, 0x082C), medfield_0 }, |
| 361 | { PCI_VDEVICE(INTEL, 0x082D), medfield_1 }, |
| 362 | { PCI_VDEVICE(INTEL, 0x082E), medfield_2 }, |
| 363 | { 0,} |
| 364 | }; |
| 365 | MODULE_DEVICE_TABLE(pci, i2_designware_pci_ids); |
| 366 | |
| 367 | static struct pci_driver dw_i2c_driver = { |
| 368 | .name = DRIVER_NAME, |
| 369 | .id_table = i2_designware_pci_ids, |
| 370 | .probe = i2c_dw_pci_probe, |
| 371 | .remove = __devexit_p(i2c_dw_pci_remove), |
Dirk Brandewie | 18dbdda | 2011-10-06 11:26:36 -0700 | [diff] [blame] | 372 | .driver = { |
| 373 | .pm = &i2c_dw_pm_ops, |
| 374 | }, |
Dirk Brandewie | fe20ff5 | 2011-10-06 11:26:35 -0700 | [diff] [blame] | 375 | }; |
| 376 | |
Axel Lin | 56f2178 | 2012-07-24 14:13:56 +0200 | [diff] [blame] | 377 | module_pci_driver(dw_i2c_driver); |
Dirk Brandewie | fe20ff5 | 2011-10-06 11:26:35 -0700 | [diff] [blame] | 378 | |
| 379 | MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>"); |
| 380 | MODULE_DESCRIPTION("Synopsys DesignWare PCI I2C bus adapter"); |
| 381 | MODULE_LICENSE("GPL"); |