drivers/spi/dw_spi_pci.c

   1 /*
   2  * mrst_spi_pci.c - PCI interface driver for DW SPI Core
   3  *
   4  * Copyright (c) 2009, 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  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 #include <linux/interrupt.h>
  21 #include <linux/pci.h>
  22 #include <linux/spi/dw_spi.h>
  23 #include <linux/spi/spi.h>
  24
  25 #define DRIVER_NAME "dw_spi_pci"
  26
  27 struct dw_spi_pci {
  28         struct pci_dev          *pdev;
  29         struct dw_spi           dws;
  30 };
  31
  32 static int __devinit spi_pci_probe(struct pci_dev *pdev,
  33         const struct pci_device_id *ent)
  34 {
  35         struct dw_spi_pci *dwpci;
  36         struct dw_spi *dws;
  37         int pci_bar = 0;
  38         int ret;
  39
  40         printk(KERN_INFO "DW: found PCI SPI controller(ID: %04x:%04x)\n",
  41                 pdev->vendor, pdev->device);
  42
  43         ret = pci_enable_device(pdev);
  44         if (ret)
  45                 return ret;
  46
  47         dwpci = kzalloc(sizeof(struct dw_spi_pci), GFP_KERNEL);
  48         if (!dwpci) {
  49                 ret = -ENOMEM;
  50                 goto err_disable;
  51         }
  52
  53         dwpci->pdev = pdev;
  54         dws = &dwpci->dws;
  55
  56         /* Get basic io resource and map it */
  57         dws->paddr = pci_resource_start(pdev, pci_bar);
  58         dws->iolen = pci_resource_len(pdev, pci_bar);
  59
  60         ret = pci_request_region(pdev, pci_bar, dev_name(&pdev->dev));
  61         if (ret)
  62                 goto err_kfree;
  63
  64         dws->regs = ioremap_nocache((unsigned long)dws->paddr,
  65                                 pci_resource_len(pdev, pci_bar));
  66         if (!dws->regs) {
  67                 ret = -ENOMEM;
  68                 goto err_release_reg;
  69         }
  70
  71         dws->parent_dev = &pdev->dev;
  72         dws->bus_num = 0;
  73         dws->num_cs = 4;
  74         dws->max_freq = 25000000;       /* for Moorestwon */
  75         dws->irq = pdev->irq;
  76         dws->fifo_len = 40;             /* FIFO has 40 words buffer */
  77
  78         ret = dw_spi_add_host(dws);
  79         if (ret)
  80                 goto err_unmap;
  81
  82         /* PCI hook and SPI hook use the same drv data */
  83         pci_set_drvdata(pdev, dwpci);
  84         return 0;
  85
  86 err_unmap:
  87         iounmap(dws->regs);
  88 err_release_reg:
  89         pci_release_region(pdev, pci_bar);
  90 err_kfree:
  91         kfree(dwpci);
  92 err_disable:
  93         pci_disable_device(pdev);
  94         return ret;
  95 }
  96
  97 static void __devexit spi_pci_remove(struct pci_dev *pdev)
  98 {
  99         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
 100
 101         pci_set_drvdata(pdev, NULL);
 102         dw_spi_remove_host(&dwpci->dws);
 103         iounmap(dwpci->dws.regs);
 104         pci_release_region(pdev, 0);
 105         kfree(dwpci);
 106         pci_disable_device(pdev);
 107 }
 108
 109 #ifdef CONFIG_PM
 110 static int spi_suspend(struct pci_dev *pdev, pm_message_t state)
 111 {
 112         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
 113         int ret;
 114
 115         ret = dw_spi_suspend_host(&dwpci->dws);
 116         if (ret)
 117                 return ret;
 118         pci_save_state(pdev);
 119         pci_disable_device(pdev);
 120         pci_set_power_state(pdev, pci_choose_state(pdev, state));
 121         return ret;
 122 }
 123
 124 static int spi_resume(struct pci_dev *pdev)
 125 {
 126         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
 127         int ret;
 128
 129         pci_set_power_state(pdev, PCI_D0);
 130         pci_restore_state(pdev);
 131         ret = pci_enable_device(pdev);
 132         if (ret)
 133                 return ret;
 134         return dw_spi_resume_host(&dwpci->dws);
 135 }
 136 #else
 137 #define spi_suspend     NULL
 138 #define spi_resume      NULL
 139 #endif
 140
 141 static const struct pci_device_id pci_ids[] __devinitdata = {
 142         /* Intel Moorestown platform SPI controller 0 */
 143         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0800) },
 144         {},
 145 };
 146
 147 static struct pci_driver dw_spi_driver = {
 148         .name =         DRIVER_NAME,
 149         .id_table =     pci_ids,
 150         .probe =        spi_pci_probe,
 151         .remove =       __devexit_p(spi_pci_remove),
 152         .suspend =      spi_suspend,
 153         .resume =       spi_resume,
 154 };
 155
 156 static int __init mrst_spi_init(void)
 157 {
 158         return pci_register_driver(&dw_spi_driver);
 159 }
 160
 161 static void __exit mrst_spi_exit(void)
 162 {
 163         pci_unregister_driver(&dw_spi_driver);
 164 }
 165
 166 module_init(mrst_spi_init);
 167 module_exit(mrst_spi_exit);
 168
 169 MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>");
 170 MODULE_DESCRIPTION("PCI interface driver for DW SPI Core");
 171 MODULE_LICENSE("GPL v2");