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Linux/drivers/spi/spi-dw-pci.c

  1 /*
  2  * 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/spi.h>
 24 #include <linux/module.h>
 25 
 26 #include "spi-dw.h"
 27 
 28 #define DRIVER_NAME "dw_spi_pci"
 29 
 30 struct dw_spi_pci {
 31         struct pci_dev  *pdev;
 32         struct dw_spi   dws;
 33 };
 34 
 35 static int spi_pci_probe(struct pci_dev *pdev,
 36         const struct pci_device_id *ent)
 37 {
 38         struct dw_spi_pci *dwpci;
 39         struct dw_spi *dws;
 40         int pci_bar = 0;
 41         int ret;
 42 
 43         dev_info(&pdev->dev, "found PCI SPI controller(ID: %04x:%04x)\n",
 44                 pdev->vendor, pdev->device);
 45 
 46         ret = pcim_enable_device(pdev);
 47         if (ret)
 48                 return ret;
 49 
 50         dwpci = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_pci),
 51                         GFP_KERNEL);
 52         if (!dwpci)
 53                 return -ENOMEM;
 54 
 55         dwpci->pdev = pdev;
 56         dws = &dwpci->dws;
 57 
 58         /* Get basic io resource and map it */
 59         dws->paddr = pci_resource_start(pdev, pci_bar);
 60 
 61         ret = pcim_iomap_regions(pdev, 1, dev_name(&pdev->dev));
 62         if (ret)
 63                 return ret;
 64 
 65         dws->bus_num = 0;
 66         dws->num_cs = 4;
 67         dws->irq = pdev->irq;
 68 
 69         /*
 70          * Specific handling for Intel MID paltforms, like dma setup,
 71          * clock rate, FIFO depth.
 72          */
 73         if (pdev->device == 0x0800) {
 74                 ret = dw_spi_mid_init(dws);
 75                 if (ret)
 76                         return ret;
 77         }
 78 
 79         ret = dw_spi_add_host(&pdev->dev, dws);
 80         if (ret)
 81                 return ret;
 82 
 83         /* PCI hook and SPI hook use the same drv data */
 84         pci_set_drvdata(pdev, dwpci);
 85 
 86         return 0;
 87 }
 88 
 89 static void spi_pci_remove(struct pci_dev *pdev)
 90 {
 91         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
 92 
 93         dw_spi_remove_host(&dwpci->dws);
 94 }
 95 
 96 #ifdef CONFIG_PM
 97 static int spi_suspend(struct pci_dev *pdev, pm_message_t state)
 98 {
 99         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
100         int ret;
101 
102         ret = dw_spi_suspend_host(&dwpci->dws);
103         if (ret)
104                 return ret;
105         pci_save_state(pdev);
106         pci_disable_device(pdev);
107         pci_set_power_state(pdev, pci_choose_state(pdev, state));
108         return ret;
109 }
110 
111 static int spi_resume(struct pci_dev *pdev)
112 {
113         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
114         int ret;
115 
116         pci_set_power_state(pdev, PCI_D0);
117         pci_restore_state(pdev);
118         ret = pci_enable_device(pdev);
119         if (ret)
120                 return ret;
121         return dw_spi_resume_host(&dwpci->dws);
122 }
123 #else
124 #define spi_suspend     NULL
125 #define spi_resume      NULL
126 #endif
127 
128 static const struct pci_device_id pci_ids[] = {
129         /* Intel MID platform SPI controller 0 */
130         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0800) },
131         {},
132 };
133 
134 static struct pci_driver dw_spi_driver = {
135         .name =         DRIVER_NAME,
136         .id_table =     pci_ids,
137         .probe =        spi_pci_probe,
138         .remove =       spi_pci_remove,
139         .suspend =      spi_suspend,
140         .resume =       spi_resume,
141 };
142 
143 module_pci_driver(dw_spi_driver);
144 
145 MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>");
146 MODULE_DESCRIPTION("PCI interface driver for DW SPI Core");
147 MODULE_LICENSE("GPL v2");
148 

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