drivers/spi/dw_spi_pci.c

   1 /*
   2  * dw_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/slab.h>
  23 #include <linux/spi/dw_spi.h>
  24 #include <linux/spi/spi.h>
  25
  26 #define DRIVER_NAME "dw_spi_pci"
  27
  28 struct dw_spi_pci {
  29         struct pci_dev  *pdev;
  30         struct dw_spi   dws;
  31 };
  32
  33 static int __devinit spi_pci_probe(struct pci_dev *pdev,
  34         const struct pci_device_id *ent)
  35 {
  36         struct dw_spi_pci *dwpci;
  37         struct dw_spi *dws;
  38         int pci_bar = 0;
  39         int ret;
  40
  41         printk(KERN_INFO "DW: found PCI SPI controller(ID: %04x:%04x)\n",
  42                 pdev->vendor, pdev->device);
  43
  44         ret = pci_enable_device(pdev);
  45         if (ret)
  46                 return ret;
  47
  48         dwpci = kzalloc(sizeof(struct dw_spi_pci), GFP_KERNEL);
  49         if (!dwpci) {
  50                 ret = -ENOMEM;
  51                 goto err_disable;
  52         }
  53
  54         dwpci->pdev = pdev;
  55         dws = &dwpci->dws;
  56
  57         /* Get basic io resource and map it */
  58         dws->paddr = pci_resource_start(pdev, pci_bar);
  59         dws->iolen = pci_resource_len(pdev, pci_bar);
  60
  61         ret = pci_request_region(pdev, pci_bar, dev_name(&pdev->dev));
  62         if (ret)
  63                 goto err_kfree;
  64
  65         dws->regs = ioremap_nocache((unsigned long)dws->paddr,
  66                                 pci_resource_len(pdev, pci_bar));
  67         if (!dws->regs) {
  68                 ret = -ENOMEM;
  69                 goto err_release_reg;
  70         }
  71
  72         dws->parent_dev = &pdev->dev;
  73         dws->bus_num = 0;
  74         dws->num_cs = 4;
  75         dws->irq = pdev->irq;
  76
  77         /*
  78          * Specific handling for Intel MID paltforms, like dma setup,
  79          * clock rate, FIFO depth.
  80          */
  81         if (pdev->device == 0x0800) {
  82                 ret = dw_spi_mid_init(dws);
  83                 if (ret)
  84                         goto err_unmap;
  85         }
  86
  87         ret = dw_spi_add_host(dws);
  88         if (ret)
  89                 goto err_unmap;
  90
  91         /* PCI hook and SPI hook use the same drv data */
  92         pci_set_drvdata(pdev, dwpci);
  93         return 0;
  94
  95 err_unmap:
  96         iounmap(dws->regs);
  97 err_release_reg:
  98         pci_release_region(pdev, pci_bar);
  99 err_kfree:
 100         kfree(dwpci);
 101 err_disable:
 102         pci_disable_device(pdev);
 103         return ret;
 104 }
 105
 106 static void __devexit spi_pci_remove(struct pci_dev *pdev)
 107 {
 108         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
 109
 110         pci_set_drvdata(pdev, NULL);
 111         dw_spi_remove_host(&dwpci->dws);
 112         iounmap(dwpci->dws.regs);
 113         pci_release_region(pdev, 0);
 114         kfree(dwpci);
 115         pci_disable_device(pdev);
 116 }
 117
 118 #ifdef CONFIG_PM
 119 static int spi_suspend(struct pci_dev *pdev, pm_message_t state)
 120 {
 121         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
 122         int ret;
 123
 124         ret = dw_spi_suspend_host(&dwpci->dws);
 125         if (ret)
 126                 return ret;
 127         pci_save_state(pdev);
 128         pci_disable_device(pdev);
 129         pci_set_power_state(pdev, pci_choose_state(pdev, state));
 130         return ret;
 131 }
 132
 133 static int spi_resume(struct pci_dev *pdev)
 134 {
 135         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
 136         int ret;
 137
 138         pci_set_power_state(pdev, PCI_D0);
 139         pci_restore_state(pdev);
 140         ret = pci_enable_device(pdev);
 141         if (ret)
 142                 return ret;
 143         return dw_spi_resume_host(&dwpci->dws);
 144 }
 145 #else
 146 #define spi_suspend     NULL
 147 #define spi_resume      NULL
 148 #endif
 149
 150 static const struct pci_device_id pci_ids[] __devinitdata = {
 151         /* Intel MID platform SPI controller 0 */
 152         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0800) },
 153         {},
 154 };
 155
 156 static struct pci_driver dw_spi_driver = {
 157         .name =         DRIVER_NAME,
 158         .id_table =     pci_ids,
 159         .probe =        spi_pci_probe,
 160         .remove =       __devexit_p(spi_pci_remove),
 161         .suspend =      spi_suspend,
 162         .resume =       spi_resume,
 163 };
 164
 165 static int __init mrst_spi_init(void)
 166 {
 167         return pci_register_driver(&dw_spi_driver);
 168 }
 169
 170 static void __exit mrst_spi_exit(void)
 171 {
 172         pci_unregister_driver(&dw_spi_driver);
 173 }
 174
 175 module_init(mrst_spi_init);
 176 module_exit(mrst_spi_exit);
 177
 178 MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>");
 179 MODULE_DESCRIPTION("PCI interface driver for DW SPI Core");
 180 MODULE_LICENSE("GPL v2");