drivers/spi/spi-dw-pci.c

   1 /*
   2  * PCI interface driver for DW SPI Core
   3  *
   4  * Copyright (c) 2009, 2014 Intel Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  */
  15
  16 #include <linux/interrupt.h>
  17 #include <linux/pci.h>
  18 #include <linux/slab.h>
  19 #include <linux/spi/spi.h>
  20 #include <linux/module.h>
  21
  22 #include "spi-dw.h"
  23
  24 #define DRIVER_NAME "dw_spi_pci"
  25
  26 struct dw_spi_pci {
  27         struct pci_dev  *pdev;
  28         struct dw_spi   dws;
  29 };
  30
  31 struct spi_pci_desc {
  32         int     (*setup)(struct dw_spi *);
  33         u16     num_cs;
  34         u16     bus_num;
  35 };
  36
  37 static struct spi_pci_desc spi_pci_mid_desc_1 = {
  38         .setup = dw_spi_mid_init,
  39         .num_cs = 5,
  40         .bus_num = 0,
  41 };
  42
  43 static struct spi_pci_desc spi_pci_mid_desc_2 = {
  44         .setup = dw_spi_mid_init,
  45         .num_cs = 2,
  46         .bus_num = 1,
  47 };
  48
  49 static int spi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
  50 {
  51         struct dw_spi_pci *dwpci;
  52         struct dw_spi *dws;
  53         struct spi_pci_desc *desc = (struct spi_pci_desc *)ent->driver_data;
  54         int pci_bar = 0;
  55         int ret;
  56
  57         ret = pcim_enable_device(pdev);
  58         if (ret)
  59                 return ret;
  60
  61         dwpci = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_pci),
  62                         GFP_KERNEL);
  63         if (!dwpci)
  64                 return -ENOMEM;
  65
  66         dwpci->pdev = pdev;
  67         dws = &dwpci->dws;
  68
  69         /* Get basic io resource and map it */
  70         dws->paddr = pci_resource_start(pdev, pci_bar);
  71
  72         ret = pcim_iomap_regions(pdev, 1 << pci_bar, pci_name(pdev));
  73         if (ret)
  74                 return ret;
  75
  76         dws->regs = pcim_iomap_table(pdev)[pci_bar];
  77
  78         dws->irq = pdev->irq;
  79
  80         /*
  81          * Specific handling for paltforms, like dma setup,
  82          * clock rate, FIFO depth.
  83          */
  84         if (desc) {
  85                 dws->num_cs = desc->num_cs;
  86                 dws->bus_num = desc->bus_num;
  87
  88                 if (desc->setup) {
  89                         ret = desc->setup(dws);
  90                         if (ret)
  91                                 return ret;
  92                 }
  93         } else {
  94                 return -ENODEV;
  95         }
  96
  97         ret = dw_spi_add_host(&pdev->dev, dws);
  98         if (ret)
  99                 return ret;
 100
 101         /* PCI hook and SPI hook use the same drv data */
 102         pci_set_drvdata(pdev, dwpci);
 103
 104         dev_info(&pdev->dev, "found PCI SPI controller(ID: %04x:%04x)\n",
 105                 pdev->vendor, pdev->device);
 106
 107         return 0;
 108 }
 109
 110 static void spi_pci_remove(struct pci_dev *pdev)
 111 {
 112         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
 113
 114         dw_spi_remove_host(&dwpci->dws);
 115 }
 116
 117 #ifdef CONFIG_PM_SLEEP
 118 static int spi_suspend(struct device *dev)
 119 {
 120         struct pci_dev *pdev = to_pci_dev(dev);
 121         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
 122
 123         return dw_spi_suspend_host(&dwpci->dws);
 124 }
 125
 126 static int spi_resume(struct device *dev)
 127 {
 128         struct pci_dev *pdev = to_pci_dev(dev);
 129         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
 130
 131         return dw_spi_resume_host(&dwpci->dws);
 132 }
 133 #endif
 134
 135 static SIMPLE_DEV_PM_OPS(dw_spi_pm_ops, spi_suspend, spi_resume);
 136
 137 static const struct pci_device_id pci_ids[] = {
 138         /* Intel MID platform SPI controller 0 */
 139         /*
 140          * The access to the device 8086:0801 is disabled by HW, since it's
 141          * exclusively used by SCU to communicate with MSIC.
 142          */
 143         /* Intel MID platform SPI controller 1 */
 144         { PCI_VDEVICE(INTEL, 0x0800), (kernel_ulong_t)&spi_pci_mid_desc_1},
 145         /* Intel MID platform SPI controller 2 */
 146         { PCI_VDEVICE(INTEL, 0x0812), (kernel_ulong_t)&spi_pci_mid_desc_2},
 147         {},
 148 };
 149
 150 static struct pci_driver dw_spi_driver = {
 151         .name =         DRIVER_NAME,
 152         .id_table =     pci_ids,
 153         .probe =        spi_pci_probe,
 154         .remove =       spi_pci_remove,
 155         .driver         = {
 156                 .pm     = &dw_spi_pm_ops,
 157         },
 158 };
 159
 160 module_pci_driver(dw_spi_driver);
 161
 162 MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>");
 163 MODULE_DESCRIPTION("PCI interface driver for DW SPI Core");
 164 MODULE_LICENSE("GPL v2");