drivers/i2c/busses/i2c-designware-pcidrv.c

   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>
  41 #include <linux/pm_runtime.h>
  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
 141 static int i2c_dw_pci_suspend(struct device *dev)
 142 {
 143         struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
 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
 165 static int i2c_dw_pci_resume(struct device *dev)
 166 {
 167         struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
 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);
 185         return 0;
 186 }
 187
 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 = {
 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)
 203 };
 204
 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
 313         pm_runtime_put_noidle(&pdev->dev);
 314         pm_runtime_allow(&pdev->dev);
 315
 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
 335         i2c_dw_disable(dev);
 336         pm_runtime_forbid(&pdev->dev);
 337         pm_runtime_get_noresume(&pdev->dev);
 338
 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
 351 static DEFINE_PCI_DEVICE_TABLE(i2_designware_pci_ids) = {
 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),
 372         .driver         = {
 373                 .pm     = &i2c_dw_pm_ops,
 374         },
 375 };
 376
 377 static int __init dw_i2c_init_driver(void)
 378 {
 379         return  pci_register_driver(&dw_i2c_driver);
 380 }
 381 module_init(dw_i2c_init_driver);
 382
 383 static void __exit dw_i2c_exit_driver(void)
 384 {
 385         pci_unregister_driver(&dw_i2c_driver);
 386 }
 387 module_exit(dw_i2c_exit_driver);
 388
 389 MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
 390 MODULE_DESCRIPTION("Synopsys DesignWare PCI I2C bus adapter");
 391 MODULE_LICENSE("GPL");