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, 2015 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  *
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/delay.h>
  29 #include <linux/i2c.h>
  30 #include <linux/errno.h>
  31 #include <linux/sched.h>
  32 #include <linux/err.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/io.h>
  35 #include <linux/slab.h>
  36 #include <linux/pci.h>
  37 #include <linux/pm_runtime.h>
  38 #include <linux/acpi.h>
  39 #include "i2c-designware-core.h"
  40
  41 #define DRIVER_NAME "i2c-designware-pci"
  42
  43 enum dw_pci_ctl_id_t {
  44         medfield_0,
  45         medfield_1,
  46         medfield_2,
  47         medfield_3,
  48         medfield_4,
  49         medfield_5,
  50
  51         baytrail,
  52         haswell,
  53 };
  54
  55 struct dw_scl_sda_cfg {
  56         u32 ss_hcnt;
  57         u32 fs_hcnt;
  58         u32 ss_lcnt;
  59         u32 fs_lcnt;
  60         u32 sda_hold;
  61 };
  62
  63 struct dw_pci_controller {
  64         u32 bus_num;
  65         u32 bus_cfg;
  66         u32 tx_fifo_depth;
  67         u32 rx_fifo_depth;
  68         u32 clk_khz;
  69         u32 functionality;
  70         struct dw_scl_sda_cfg *scl_sda_cfg;
  71 };
  72
  73 #define INTEL_MID_STD_CFG  (DW_IC_CON_MASTER |                  \
  74                                 DW_IC_CON_SLAVE_DISABLE |       \
  75                                 DW_IC_CON_RESTART_EN)
  76
  77 #define DW_DEFAULT_FUNCTIONALITY (I2C_FUNC_I2C |                        \
  78                                         I2C_FUNC_SMBUS_BYTE |           \
  79                                         I2C_FUNC_SMBUS_BYTE_DATA |      \
  80                                         I2C_FUNC_SMBUS_WORD_DATA |      \
  81                                         I2C_FUNC_SMBUS_I2C_BLOCK)
  82
  83 /* BayTrail HCNT/LCNT/SDA hold time */
  84 static struct dw_scl_sda_cfg byt_config = {
  85         .ss_hcnt = 0x200,
  86         .fs_hcnt = 0x55,
  87         .ss_lcnt = 0x200,
  88         .fs_lcnt = 0x99,
  89         .sda_hold = 0x6,
  90 };
  91
  92 /* Haswell HCNT/LCNT/SDA hold time */
  93 static struct dw_scl_sda_cfg hsw_config = {
  94         .ss_hcnt = 0x01b0,
  95         .fs_hcnt = 0x48,
  96         .ss_lcnt = 0x01fb,
  97         .fs_lcnt = 0xa0,
  98         .sda_hold = 0x9,
  99 };
 100
 101 static struct dw_pci_controller dw_pci_controllers[] = {
 102         [medfield_0] = {
 103                 .bus_num     = 0,
 104                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 105                 .tx_fifo_depth = 32,
 106                 .rx_fifo_depth = 32,
 107                 .clk_khz      = 25000,
 108         },
 109         [medfield_1] = {
 110                 .bus_num     = 1,
 111                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 112                 .tx_fifo_depth = 32,
 113                 .rx_fifo_depth = 32,
 114                 .clk_khz      = 25000,
 115         },
 116         [medfield_2] = {
 117                 .bus_num     = 2,
 118                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 119                 .tx_fifo_depth = 32,
 120                 .rx_fifo_depth = 32,
 121                 .clk_khz      = 25000,
 122         },
 123         [medfield_3] = {
 124                 .bus_num     = 3,
 125                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_STD,
 126                 .tx_fifo_depth = 32,
 127                 .rx_fifo_depth = 32,
 128                 .clk_khz      = 25000,
 129         },
 130         [medfield_4] = {
 131                 .bus_num     = 4,
 132                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 133                 .tx_fifo_depth = 32,
 134                 .rx_fifo_depth = 32,
 135                 .clk_khz      = 25000,
 136         },
 137         [medfield_5] = {
 138                 .bus_num     = 5,
 139                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 140                 .tx_fifo_depth = 32,
 141                 .rx_fifo_depth = 32,
 142                 .clk_khz      = 25000,
 143         },
 144         [baytrail] = {
 145                 .bus_num = -1,
 146                 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 147                 .tx_fifo_depth = 32,
 148                 .rx_fifo_depth = 32,
 149                 .functionality = I2C_FUNC_10BIT_ADDR,
 150                 .scl_sda_cfg = &byt_config,
 151         },
 152         [haswell] = {
 153                 .bus_num = -1,
 154                 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 155                 .tx_fifo_depth = 32,
 156                 .rx_fifo_depth = 32,
 157                 .functionality = I2C_FUNC_10BIT_ADDR,
 158                 .scl_sda_cfg = &hsw_config,
 159         },
 160 };
 161
 162 #ifdef CONFIG_PM
 163 static int i2c_dw_pci_suspend(struct device *dev)
 164 {
 165         struct pci_dev *pdev = to_pci_dev(dev);
 166
 167         i2c_dw_disable(pci_get_drvdata(pdev));
 168         return 0;
 169 }
 170
 171 static int i2c_dw_pci_resume(struct device *dev)
 172 {
 173         struct pci_dev *pdev = to_pci_dev(dev);
 174
 175         return i2c_dw_init(pci_get_drvdata(pdev));
 176 }
 177 #endif
 178
 179 static UNIVERSAL_DEV_PM_OPS(i2c_dw_pm_ops, i2c_dw_pci_suspend,
 180                             i2c_dw_pci_resume, NULL);
 181
 182 static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
 183 {
 184         return dev->controller->clk_khz;
 185 }
 186
 187 static int i2c_dw_pci_probe(struct pci_dev *pdev,
 188                             const struct pci_device_id *id)
 189 {
 190         struct dw_i2c_dev *dev;
 191         struct i2c_adapter *adap;
 192         int r;
 193         struct  dw_pci_controller *controller;
 194         struct dw_scl_sda_cfg *cfg;
 195
 196         if (id->driver_data >= ARRAY_SIZE(dw_pci_controllers)) {
 197                 dev_err(&pdev->dev, "%s: invalid driver data %ld\n", __func__,
 198                         id->driver_data);
 199                 return -EINVAL;
 200         }
 201
 202         controller = &dw_pci_controllers[id->driver_data];
 203
 204         r = pcim_enable_device(pdev);
 205         if (r) {
 206                 dev_err(&pdev->dev, "Failed to enable I2C PCI device (%d)\n",
 207                         r);
 208                 return r;
 209         }
 210
 211         r = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev));
 212         if (r) {
 213                 dev_err(&pdev->dev, "I/O memory remapping failed\n");
 214                 return r;
 215         }
 216
 217         dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
 218         if (!dev)
 219                 return -ENOMEM;
 220
 221         dev->clk = NULL;
 222         dev->controller = controller;
 223         dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
 224         dev->base = pcim_iomap_table(pdev)[0];
 225         dev->dev = &pdev->dev;
 226         dev->irq = pdev->irq;
 227         dev->functionality = controller->functionality |
 228                                 DW_DEFAULT_FUNCTIONALITY;
 229
 230         dev->master_cfg = controller->bus_cfg;
 231         if (controller->scl_sda_cfg) {
 232                 cfg = controller->scl_sda_cfg;
 233                 dev->ss_hcnt = cfg->ss_hcnt;
 234                 dev->fs_hcnt = cfg->fs_hcnt;
 235                 dev->ss_lcnt = cfg->ss_lcnt;
 236                 dev->fs_lcnt = cfg->fs_lcnt;
 237                 dev->sda_hold_time = cfg->sda_hold;
 238         }
 239
 240         pci_set_drvdata(pdev, dev);
 241
 242         dev->tx_fifo_depth = controller->tx_fifo_depth;
 243         dev->rx_fifo_depth = controller->rx_fifo_depth;
 244
 245         adap = &dev->adapter;
 246         adap->owner = THIS_MODULE;
 247         adap->class = 0;
 248         ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
 249         adap->nr = controller->bus_num;
 250
 251         r = i2c_dw_probe(dev);
 252         if (r)
 253                 return r;
 254
 255         pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
 256         pm_runtime_use_autosuspend(&pdev->dev);
 257         pm_runtime_put_autosuspend(&pdev->dev);
 258         pm_runtime_allow(&pdev->dev);
 259
 260         return 0;
 261 }
 262
 263 static void i2c_dw_pci_remove(struct pci_dev *pdev)
 264 {
 265         struct dw_i2c_dev *dev = pci_get_drvdata(pdev);
 266
 267         i2c_dw_disable(dev);
 268         pm_runtime_forbid(&pdev->dev);
 269         pm_runtime_get_noresume(&pdev->dev);
 270
 271         i2c_del_adapter(&dev->adapter);
 272 }
 273
 274 /* work with hotplug and coldplug */
 275 MODULE_ALIAS("i2c_designware-pci");
 276
 277 static const struct pci_device_id i2_designware_pci_ids[] = {
 278         /* Medfield */
 279         { PCI_VDEVICE(INTEL, 0x0817), medfield_3 },
 280         { PCI_VDEVICE(INTEL, 0x0818), medfield_4 },
 281         { PCI_VDEVICE(INTEL, 0x0819), medfield_5 },
 282         { PCI_VDEVICE(INTEL, 0x082C), medfield_0 },
 283         { PCI_VDEVICE(INTEL, 0x082D), medfield_1 },
 284         { PCI_VDEVICE(INTEL, 0x082E), medfield_2 },
 285         /* Baytrail */
 286         { PCI_VDEVICE(INTEL, 0x0F41), baytrail },
 287         { PCI_VDEVICE(INTEL, 0x0F42), baytrail },
 288         { PCI_VDEVICE(INTEL, 0x0F43), baytrail },
 289         { PCI_VDEVICE(INTEL, 0x0F44), baytrail },
 290         { PCI_VDEVICE(INTEL, 0x0F45), baytrail },
 291         { PCI_VDEVICE(INTEL, 0x0F46), baytrail },
 292         { PCI_VDEVICE(INTEL, 0x0F47), baytrail },
 293         /* Haswell */
 294         { PCI_VDEVICE(INTEL, 0x9c61), haswell },
 295         { PCI_VDEVICE(INTEL, 0x9c62), haswell },
 296         /* Braswell / Cherrytrail */
 297         { PCI_VDEVICE(INTEL, 0x22C1), baytrail },
 298         { PCI_VDEVICE(INTEL, 0x22C2), baytrail },
 299         { PCI_VDEVICE(INTEL, 0x22C3), baytrail },
 300         { PCI_VDEVICE(INTEL, 0x22C4), baytrail },
 301         { PCI_VDEVICE(INTEL, 0x22C5), baytrail },
 302         { PCI_VDEVICE(INTEL, 0x22C6), baytrail },
 303         { PCI_VDEVICE(INTEL, 0x22C7), baytrail },
 304         { 0,}
 305 };
 306 MODULE_DEVICE_TABLE(pci, i2_designware_pci_ids);
 307
 308 static struct pci_driver dw_i2c_driver = {
 309         .name           = DRIVER_NAME,
 310         .id_table       = i2_designware_pci_ids,
 311         .probe          = i2c_dw_pci_probe,
 312         .remove         = i2c_dw_pci_remove,
 313         .driver         = {
 314                 .pm     = &i2c_dw_pm_ops,
 315         },
 316 };
 317
 318 module_pci_driver(dw_i2c_driver);
 319
 320 MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
 321 MODULE_DESCRIPTION("Synopsys DesignWare PCI I2C bus adapter");
 322 MODULE_LICENSE("GPL");