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 "i2c-designware-core.h"
  42
  43 #define DRIVER_NAME "i2c-designware-pci"
  44
  45 enum dw_pci_ctl_id_t {
  46         moorestown_0,
  47         moorestown_1,
  48         moorestown_2,
  49
  50         medfield_0,
  51         medfield_1,
  52         medfield_2,
  53         medfield_3,
  54         medfield_4,
  55         medfield_5,
  56 };
  57
  58 struct dw_pci_controller {
  59         u32 bus_num;
  60         u32 bus_cfg;
  61         u32 tx_fifo_depth;
  62         u32 rx_fifo_depth;
  63         u32 clk_khz;
  64 };
  65
  66 #define INTEL_MID_STD_CFG  (DW_IC_CON_MASTER |                  \
  67                                 DW_IC_CON_SLAVE_DISABLE |       \
  68                                 DW_IC_CON_RESTART_EN)
  69
  70 static struct  dw_pci_controller  dw_pci_controllers[] = {
  71         [moorestown_0] = {
  72                 .bus_num     = 0,
  73                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
  74                 .tx_fifo_depth = 32,
  75                 .rx_fifo_depth = 32,
  76                 .clk_khz      = 25000,
  77         },
  78         [moorestown_1] = {
  79                 .bus_num     = 1,
  80                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
  81                 .tx_fifo_depth = 32,
  82                 .rx_fifo_depth = 32,
  83                 .clk_khz      = 25000,
  84         },
  85         [moorestown_2] = {
  86                 .bus_num     = 2,
  87                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
  88                 .tx_fifo_depth = 32,
  89                 .rx_fifo_depth = 32,
  90                 .clk_khz      = 25000,
  91         },
  92         [medfield_0] = {
  93                 .bus_num     = 0,
  94                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
  95                 .tx_fifo_depth = 32,
  96                 .rx_fifo_depth = 32,
  97                 .clk_khz      = 25000,
  98         },
  99         [medfield_1] = {
 100                 .bus_num     = 1,
 101                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 102                 .tx_fifo_depth = 32,
 103                 .rx_fifo_depth = 32,
 104                 .clk_khz      = 25000,
 105         },
 106         [medfield_2] = {
 107                 .bus_num     = 2,
 108                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 109                 .tx_fifo_depth = 32,
 110                 .rx_fifo_depth = 32,
 111                 .clk_khz      = 25000,
 112         },
 113         [medfield_3] = {
 114                 .bus_num     = 3,
 115                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_STD,
 116                 .tx_fifo_depth = 32,
 117                 .rx_fifo_depth = 32,
 118                 .clk_khz      = 25000,
 119         },
 120         [medfield_4] = {
 121                 .bus_num     = 4,
 122                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 123                 .tx_fifo_depth = 32,
 124                 .rx_fifo_depth = 32,
 125                 .clk_khz      = 25000,
 126         },
 127         [medfield_5] = {
 128                 .bus_num     = 5,
 129                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 130                 .tx_fifo_depth = 32,
 131                 .rx_fifo_depth = 32,
 132                 .clk_khz      = 25000,
 133         },
 134 };
 135 static struct i2c_algorithm i2c_dw_algo = {
 136         .master_xfer    = i2c_dw_xfer,
 137         .functionality  = i2c_dw_func,
 138 };
 139
 140 static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
 141 {
 142         return dev->controller->clk_khz;
 143 }
 144
 145 static int __devinit i2c_dw_pci_probe(struct pci_dev *pdev,
 146 const struct pci_device_id *id)
 147 {
 148         struct dw_i2c_dev *dev;
 149         struct i2c_adapter *adap;
 150         unsigned long start, len;
 151         void __iomem *base;
 152         int r;
 153         struct  dw_pci_controller *controller;
 154
 155         if (id->driver_data >= ARRAY_SIZE(dw_pci_controllers)) {
 156                 printk(KERN_ERR "dw_i2c_pci_probe: invalid driver data %ld\n",
 157                         id->driver_data);
 158                 return -EINVAL;
 159         }
 160
 161         controller = &dw_pci_controllers[id->driver_data];
 162
 163         r = pci_enable_device(pdev);
 164         if (r) {
 165                 dev_err(&pdev->dev, "Failed to enable I2C PCI device (%d)\n",
 166                         r);
 167                 goto exit;
 168         }
 169
 170         /* Determine the address of the I2C area */
 171         start = pci_resource_start(pdev, 0);
 172         len = pci_resource_len(pdev, 0);
 173         if (!start || len == 0) {
 174                 dev_err(&pdev->dev, "base address not set\n");
 175                 r = -ENODEV;
 176                 goto exit;
 177         }
 178
 179         r = pci_request_region(pdev, 0, DRIVER_NAME);
 180         if (r) {
 181                 dev_err(&pdev->dev, "failed to request I2C region "
 182                         "0x%lx-0x%lx\n", start,
 183                         (unsigned long)pci_resource_end(pdev, 0));
 184                 goto exit;
 185         }
 186
 187         base = ioremap_nocache(start, len);
 188         if (!base) {
 189                 dev_err(&pdev->dev, "I/O memory remapping failed\n");
 190                 r = -ENOMEM;
 191                 goto err_release_region;
 192         }
 193
 194
 195         dev = kzalloc(sizeof(struct dw_i2c_dev), GFP_KERNEL);
 196         if (!dev) {
 197                 r = -ENOMEM;
 198                 goto err_release_region;
 199         }
 200
 201         init_completion(&dev->cmd_complete);
 202         mutex_init(&dev->lock);
 203         dev->clk = NULL;
 204         dev->controller = controller;
 205         dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
 206         dev->base = base;
 207         dev->dev = get_device(&pdev->dev);
 208         dev->functionality =
 209                 I2C_FUNC_I2C |
 210                 I2C_FUNC_SMBUS_BYTE |
 211                 I2C_FUNC_SMBUS_BYTE_DATA |
 212                 I2C_FUNC_SMBUS_WORD_DATA |
 213                 I2C_FUNC_SMBUS_I2C_BLOCK;
 214         dev->master_cfg =  controller->bus_cfg;
 215
 216         pci_set_drvdata(pdev, dev);
 217
 218         dev->tx_fifo_depth = controller->tx_fifo_depth;
 219         dev->rx_fifo_depth = controller->rx_fifo_depth;
 220         r = i2c_dw_init(dev);
 221         if (r)
 222                 goto err_iounmap;
 223
 224         adap = &dev->adapter;
 225         i2c_set_adapdata(adap, dev);
 226         adap->owner = THIS_MODULE;
 227         adap->class = 0;
 228         adap->algo = &i2c_dw_algo;
 229         adap->dev.parent = &pdev->dev;
 230         adap->nr = controller->bus_num;
 231         snprintf(adap->name, sizeof(adap->name), "i2c-designware-pci-%d",
 232                 adap->nr);
 233
 234         r = request_irq(pdev->irq, i2c_dw_isr, IRQF_SHARED, adap->name, dev);
 235         if (r) {
 236                 dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
 237                 goto err_iounmap;
 238         }
 239
 240         i2c_dw_disable_int(dev);
 241         i2c_dw_clear_int(dev);
 242         r = i2c_add_numbered_adapter(adap);
 243         if (r) {
 244                 dev_err(&pdev->dev, "failure adding adapter\n");
 245                 goto err_free_irq;
 246         }
 247
 248         return 0;
 249
 250 err_free_irq:
 251         free_irq(pdev->irq, dev);
 252 err_iounmap:
 253         iounmap(dev->base);
 254         pci_set_drvdata(pdev, NULL);
 255         put_device(&pdev->dev);
 256         kfree(dev);
 257 err_release_region:
 258         pci_release_region(pdev, 0);
 259 exit:
 260         return r;
 261 }
 262
 263 static void __devexit i2c_dw_pci_remove(struct pci_dev *pdev)
 264 {
 265         struct dw_i2c_dev *dev = pci_get_drvdata(pdev);
 266
 267         pci_set_drvdata(pdev, NULL);
 268         i2c_del_adapter(&dev->adapter);
 269         put_device(&pdev->dev);
 270
 271         free_irq(dev->irq, dev);
 272         kfree(dev);
 273         pci_release_region(pdev, 0);
 274 }
 275
 276 /* work with hotplug and coldplug */
 277 MODULE_ALIAS("i2c_designware-pci");
 278
 279 DEFINE_PCI_DEVICE_TABLE(i2_designware_pci_ids) = {
 280         /* Moorestown */
 281         { PCI_VDEVICE(INTEL, 0x0802), moorestown_0 },
 282         { PCI_VDEVICE(INTEL, 0x0803), moorestown_1 },
 283         { PCI_VDEVICE(INTEL, 0x0804), moorestown_2 },
 284         /* Medfield */
 285         { PCI_VDEVICE(INTEL, 0x0817), medfield_3,},
 286         { PCI_VDEVICE(INTEL, 0x0818), medfield_4 },
 287         { PCI_VDEVICE(INTEL, 0x0819), medfield_5 },
 288         { PCI_VDEVICE(INTEL, 0x082C), medfield_0 },
 289         { PCI_VDEVICE(INTEL, 0x082D), medfield_1 },
 290         { PCI_VDEVICE(INTEL, 0x082E), medfield_2 },
 291         { 0,}
 292 };
 293 MODULE_DEVICE_TABLE(pci, i2_designware_pci_ids);
 294
 295 static struct pci_driver dw_i2c_driver = {
 296         .name           = DRIVER_NAME,
 297         .id_table       = i2_designware_pci_ids,
 298         .probe          = i2c_dw_pci_probe,
 299         .remove         = __devexit_p(i2c_dw_pci_remove),
 300 };
 301
 302 static int __init dw_i2c_init_driver(void)
 303 {
 304         return  pci_register_driver(&dw_i2c_driver);
 305 }
 306 module_init(dw_i2c_init_driver);
 307
 308 static void __exit dw_i2c_exit_driver(void)
 309 {
 310         pci_unregister_driver(&dw_i2c_driver);
 311 }
 312 module_exit(dw_i2c_exit_driver);
 313
 314 MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
 315 MODULE_DESCRIPTION("Synopsys DesignWare PCI I2C bus adapter");
 316 MODULE_LICENSE("GPL");