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 "i2c-designware-core.h"
  39
  40 #define DRIVER_NAME "i2c-designware-pci"
  41
  42 enum dw_pci_ctl_id_t {
  43         medfield_0,
  44         medfield_1,
  45         medfield_2,
  46         medfield_3,
  47         medfield_4,
  48         medfield_5,
  49
  50         baytrail,
  51         haswell,
  52 };
  53
  54 struct dw_scl_sda_cfg {
  55         u32 ss_hcnt;
  56         u32 fs_hcnt;
  57         u32 ss_lcnt;
  58         u32 fs_lcnt;
  59         u32 sda_hold;
  60 };
  61
  62 struct dw_pci_controller {
  63         u32 bus_num;
  64         u32 bus_cfg;
  65         u32 tx_fifo_depth;
  66         u32 rx_fifo_depth;
  67         u32 clk_khz;
  68         u32 functionality;
  69         struct dw_scl_sda_cfg *scl_sda_cfg;
  70 };
  71
  72 #define INTEL_MID_STD_CFG  (DW_IC_CON_MASTER |                  \
  73                                 DW_IC_CON_SLAVE_DISABLE |       \
  74                                 DW_IC_CON_RESTART_EN)
  75
  76 #define DW_DEFAULT_FUNCTIONALITY (I2C_FUNC_I2C |                        \
  77                                         I2C_FUNC_SMBUS_BYTE |           \
  78                                         I2C_FUNC_SMBUS_BYTE_DATA |      \
  79                                         I2C_FUNC_SMBUS_WORD_DATA |      \
  80                                         I2C_FUNC_SMBUS_I2C_BLOCK)
  81
  82 /* BayTrail HCNT/LCNT/SDA hold time */
  83 static struct dw_scl_sda_cfg byt_config = {
  84         .ss_hcnt = 0x200,
  85         .fs_hcnt = 0x55,
  86         .ss_lcnt = 0x200,
  87         .fs_lcnt = 0x99,
  88         .sda_hold = 0x6,
  89 };
  90
  91 /* Haswell HCNT/LCNT/SDA hold time */
  92 static struct dw_scl_sda_cfg hsw_config = {
  93         .ss_hcnt = 0x01b0,
  94         .fs_hcnt = 0x48,
  95         .ss_lcnt = 0x01fb,
  96         .fs_lcnt = 0xa0,
  97         .sda_hold = 0x9,
  98 };
  99
 100 static struct dw_pci_controller dw_pci_controllers[] = {
 101         [medfield_0] = {
 102                 .bus_num     = 0,
 103                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 104                 .tx_fifo_depth = 32,
 105                 .rx_fifo_depth = 32,
 106                 .clk_khz      = 25000,
 107         },
 108         [medfield_1] = {
 109                 .bus_num     = 1,
 110                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 111                 .tx_fifo_depth = 32,
 112                 .rx_fifo_depth = 32,
 113                 .clk_khz      = 25000,
 114         },
 115         [medfield_2] = {
 116                 .bus_num     = 2,
 117                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 118                 .tx_fifo_depth = 32,
 119                 .rx_fifo_depth = 32,
 120                 .clk_khz      = 25000,
 121         },
 122         [medfield_3] = {
 123                 .bus_num     = 3,
 124                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_STD,
 125                 .tx_fifo_depth = 32,
 126                 .rx_fifo_depth = 32,
 127                 .clk_khz      = 25000,
 128         },
 129         [medfield_4] = {
 130                 .bus_num     = 4,
 131                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 132                 .tx_fifo_depth = 32,
 133                 .rx_fifo_depth = 32,
 134                 .clk_khz      = 25000,
 135         },
 136         [medfield_5] = {
 137                 .bus_num     = 5,
 138                 .bus_cfg   = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 139                 .tx_fifo_depth = 32,
 140                 .rx_fifo_depth = 32,
 141                 .clk_khz      = 25000,
 142         },
 143         [baytrail] = {
 144                 .bus_num = -1,
 145                 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 146                 .tx_fifo_depth = 32,
 147                 .rx_fifo_depth = 32,
 148                 .functionality = I2C_FUNC_10BIT_ADDR,
 149                 .scl_sda_cfg = &byt_config,
 150         },
 151         [haswell] = {
 152                 .bus_num = -1,
 153                 .bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
 154                 .tx_fifo_depth = 32,
 155                 .rx_fifo_depth = 32,
 156                 .functionality = I2C_FUNC_10BIT_ADDR,
 157                 .scl_sda_cfg = &hsw_config,
 158         },
 159 };
 160
 161 static struct i2c_algorithm i2c_dw_algo = {
 162         .master_xfer    = i2c_dw_xfer,
 163         .functionality  = i2c_dw_func,
 164 };
 165
 166 #ifdef CONFIG_PM
 167 static int i2c_dw_pci_suspend(struct device *dev)
 168 {
 169         struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
 170
 171         i2c_dw_disable(pci_get_drvdata(pdev));
 172         return 0;
 173 }
 174
 175 static int i2c_dw_pci_resume(struct device *dev)
 176 {
 177         struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
 178
 179         return i2c_dw_init(pci_get_drvdata(pdev));
 180 }
 181 #endif
 182
 183 static UNIVERSAL_DEV_PM_OPS(i2c_dw_pm_ops, i2c_dw_pci_suspend,
 184                             i2c_dw_pci_resume, NULL);
 185
 186 static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
 187 {
 188         return dev->controller->clk_khz;
 189 }
 190
 191 static int i2c_dw_pci_probe(struct pci_dev *pdev,
 192                             const struct pci_device_id *id)
 193 {
 194         struct dw_i2c_dev *dev;
 195         struct i2c_adapter *adap;
 196         int r;
 197         struct  dw_pci_controller *controller;
 198         struct dw_scl_sda_cfg *cfg;
 199
 200         if (id->driver_data >= ARRAY_SIZE(dw_pci_controllers)) {
 201                 dev_err(&pdev->dev, "%s: invalid driver data %ld\n", __func__,
 202                         id->driver_data);
 203                 return -EINVAL;
 204         }
 205
 206         controller = &dw_pci_controllers[id->driver_data];
 207
 208         r = pcim_enable_device(pdev);
 209         if (r) {
 210                 dev_err(&pdev->dev, "Failed to enable I2C PCI device (%d)\n",
 211                         r);
 212                 return r;
 213         }
 214
 215         r = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev));
 216         if (r) {
 217                 dev_err(&pdev->dev, "I/O memory remapping failed\n");
 218                 return r;
 219         }
 220
 221         dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
 222         if (!dev)
 223                 return -ENOMEM;
 224
 225         init_completion(&dev->cmd_complete);
 226         mutex_init(&dev->lock);
 227         dev->clk = NULL;
 228         dev->controller = controller;
 229         dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
 230         dev->base = pcim_iomap_table(pdev)[0];
 231         dev->dev = &pdev->dev;
 232         dev->functionality = controller->functionality |
 233                                 DW_DEFAULT_FUNCTIONALITY;
 234
 235         dev->master_cfg = controller->bus_cfg;
 236         if (controller->scl_sda_cfg) {
 237                 cfg = controller->scl_sda_cfg;
 238                 dev->ss_hcnt = cfg->ss_hcnt;
 239                 dev->fs_hcnt = cfg->fs_hcnt;
 240                 dev->ss_lcnt = cfg->ss_lcnt;
 241                 dev->fs_lcnt = cfg->fs_lcnt;
 242                 dev->sda_hold_time = cfg->sda_hold;
 243         }
 244
 245         pci_set_drvdata(pdev, dev);
 246
 247         dev->tx_fifo_depth = controller->tx_fifo_depth;
 248         dev->rx_fifo_depth = controller->rx_fifo_depth;
 249         r = i2c_dw_init(dev);
 250         if (r)
 251                 return r;
 252
 253         adap = &dev->adapter;
 254         i2c_set_adapdata(adap, dev);
 255         adap->owner = THIS_MODULE;
 256         adap->class = 0;
 257         adap->algo = &i2c_dw_algo;
 258         adap->dev.parent = &pdev->dev;
 259         adap->nr = controller->bus_num;
 260
 261         snprintf(adap->name, sizeof(adap->name), "i2c-designware-pci");
 262
 263         r = devm_request_irq(&pdev->dev, pdev->irq, i2c_dw_isr,
 264                         IRQF_SHARED | IRQF_COND_SUSPEND, adap->name, dev);
 265         if (r) {
 266                 dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
 267                 return r;
 268         }
 269
 270         i2c_dw_disable_int(dev);
 271         i2c_dw_clear_int(dev);
 272         r = i2c_add_numbered_adapter(adap);
 273         if (r) {
 274                 dev_err(&pdev->dev, "failure adding adapter\n");
 275                 return r;
 276         }
 277
 278         pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
 279         pm_runtime_use_autosuspend(&pdev->dev);
 280         pm_runtime_put_autosuspend(&pdev->dev);
 281         pm_runtime_allow(&pdev->dev);
 282
 283         return 0;
 284 }
 285
 286 static void i2c_dw_pci_remove(struct pci_dev *pdev)
 287 {
 288         struct dw_i2c_dev *dev = pci_get_drvdata(pdev);
 289
 290         i2c_dw_disable(dev);
 291         pm_runtime_forbid(&pdev->dev);
 292         pm_runtime_get_noresume(&pdev->dev);
 293
 294         i2c_del_adapter(&dev->adapter);
 295 }
 296
 297 /* work with hotplug and coldplug */
 298 MODULE_ALIAS("i2c_designware-pci");
 299
 300 static const struct pci_device_id i2_designware_pci_ids[] = {
 301         /* Medfield */
 302         { PCI_VDEVICE(INTEL, 0x0817), medfield_3 },
 303         { PCI_VDEVICE(INTEL, 0x0818), medfield_4 },
 304         { PCI_VDEVICE(INTEL, 0x0819), medfield_5 },
 305         { PCI_VDEVICE(INTEL, 0x082C), medfield_0 },
 306         { PCI_VDEVICE(INTEL, 0x082D), medfield_1 },
 307         { PCI_VDEVICE(INTEL, 0x082E), medfield_2 },
 308         /* Baytrail */
 309         { PCI_VDEVICE(INTEL, 0x0F41), baytrail },
 310         { PCI_VDEVICE(INTEL, 0x0F42), baytrail },
 311         { PCI_VDEVICE(INTEL, 0x0F43), baytrail },
 312         { PCI_VDEVICE(INTEL, 0x0F44), baytrail },
 313         { PCI_VDEVICE(INTEL, 0x0F45), baytrail },
 314         { PCI_VDEVICE(INTEL, 0x0F46), baytrail },
 315         { PCI_VDEVICE(INTEL, 0x0F47), baytrail },
 316         /* Haswell */
 317         { PCI_VDEVICE(INTEL, 0x9c61), haswell },
 318         { PCI_VDEVICE(INTEL, 0x9c62), haswell },
 319         /* Braswell / Cherrytrail */
 320         { PCI_VDEVICE(INTEL, 0x22C1), baytrail },
 321         { PCI_VDEVICE(INTEL, 0x22C2), baytrail },
 322         { PCI_VDEVICE(INTEL, 0x22C3), baytrail },
 323         { PCI_VDEVICE(INTEL, 0x22C4), baytrail },
 324         { PCI_VDEVICE(INTEL, 0x22C5), baytrail },
 325         { PCI_VDEVICE(INTEL, 0x22C6), baytrail },
 326         { PCI_VDEVICE(INTEL, 0x22C7), baytrail },
 327         { 0,}
 328 };
 329 MODULE_DEVICE_TABLE(pci, i2_designware_pci_ids);
 330
 331 static struct pci_driver dw_i2c_driver = {
 332         .name           = DRIVER_NAME,
 333         .id_table       = i2_designware_pci_ids,
 334         .probe          = i2c_dw_pci_probe,
 335         .remove         = i2c_dw_pci_remove,
 336         .driver         = {
 337                 .pm     = &i2c_dw_pm_ops,
 338         },
 339 };
 340
 341 module_pci_driver(dw_i2c_driver);
 342
 343 MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
 344 MODULE_DESCRIPTION("Synopsys DesignWare PCI I2C bus adapter");
 345 MODULE_LICENSE("GPL");