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/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->max_freq = 25000000;       /* for Moorestwon */
  76         dws->irq = pdev->irq;
  77         dws->fifo_len = 40;             /* FIFO has 40 words buffer */
  78
  79         ret = dw_spi_add_host(dws);
  80         if (ret)
  81                 goto err_unmap;
  82
  83         /* PCI hook and SPI hook use the same drv data */
  84         pci_set_drvdata(pdev, dwpci);
  85         return 0;
  86
  87 err_unmap:
  88         iounmap(dws->regs);
  89 err_release_reg:
  90         pci_release_region(pdev, pci_bar);
  91 err_kfree:
  92         kfree(dwpci);
  93 err_disable:
  94         pci_disable_device(pdev);
  95         return ret;
  96 }
  97
  98 static void __devexit spi_pci_remove(struct pci_dev *pdev)
  99 {
 100         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
 101
 102         pci_set_drvdata(pdev, NULL);
 103         dw_spi_remove_host(&dwpci->dws);
 104         iounmap(dwpci->dws.regs);
 105         pci_release_region(pdev, 0);
 106         kfree(dwpci);
 107         pci_disable_device(pdev);
 108 }
 109
 110 #ifdef CONFIG_PM
 111 static int spi_suspend(struct pci_dev *pdev, pm_message_t state)
 112 {
 113         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
 114         int ret;
 115
 116         ret = dw_spi_suspend_host(&dwpci->dws);
 117         if (ret)
 118                 return ret;
 119         pci_save_state(pdev);
 120         pci_disable_device(pdev);
 121         pci_set_power_state(pdev, pci_choose_state(pdev, state));
 122         return ret;
 123 }
 124
 125 static int spi_resume(struct pci_dev *pdev)
 126 {
 127         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
 128         int ret;
 129
 130         pci_set_power_state(pdev, PCI_D0);
 131         pci_restore_state(pdev);
 132         ret = pci_enable_device(pdev);
 133         if (ret)
 134                 return ret;
 135         return dw_spi_resume_host(&dwpci->dws);
 136 }
 137 #else
 138 #define spi_suspend     NULL
 139 #define spi_resume      NULL
 140 #endif
 141
 142 static const struct pci_device_id pci_ids[] __devinitdata = {
 143         /* Intel Moorestown platform SPI controller 0 */
 144         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0800) },
 145         {},
 146 };
 147
 148 static struct pci_driver dw_spi_driver = {
 149         .name =         DRIVER_NAME,
 150         .id_table =     pci_ids,
 151         .probe =        spi_pci_probe,
 152         .remove =       __devexit_p(spi_pci_remove),
 153         .suspend =      spi_suspend,
 154         .resume =       spi_resume,
 155 };
 156
 157 static int __init mrst_spi_init(void)
 158 {
 159         return pci_register_driver(&dw_spi_driver);
 160 }
 161
 162 static void __exit mrst_spi_exit(void)
 163 {
 164         pci_unregister_driver(&dw_spi_driver);
 165 }
 166
 167 module_init(mrst_spi_init);
 168 module_exit(mrst_spi_exit);
 169
 170 MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>");
 171 MODULE_DESCRIPTION("PCI interface driver for DW SPI Core");
 172 MODULE_LICENSE("GPL v2");