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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->regs = pcim_iomap_table(pdev)[pci_bar];
 66 
 67         dws->bus_num = 0;
 68         dws->num_cs = 4;
 69         dws->irq = pdev->irq;
 70 
 71         /*
 72          * Specific handling for Intel MID paltforms, like dma setup,
 73          * clock rate, FIFO depth.
 74          */
 75         if (pdev->device == 0x0800) {
 76                 ret = dw_spi_mid_init(dws);
 77                 if (ret)
 78                         return ret;
 79         }
 80 
 81         ret = dw_spi_add_host(&pdev->dev, dws);
 82         if (ret)
 83                 return ret;
 84 
 85         /* PCI hook and SPI hook use the same drv data */
 86         pci_set_drvdata(pdev, dwpci);
 87 
 88         return 0;
 89 }
 90 
 91 static void spi_pci_remove(struct pci_dev *pdev)
 92 {
 93         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
 94 
 95         dw_spi_remove_host(&dwpci->dws);
 96 }
 97 
 98 #ifdef CONFIG_PM
 99 static int spi_suspend(struct pci_dev *pdev, pm_message_t state)
100 {
101         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
102         int ret;
103 
104         ret = dw_spi_suspend_host(&dwpci->dws);
105         if (ret)
106                 return ret;
107         pci_save_state(pdev);
108         pci_disable_device(pdev);
109         pci_set_power_state(pdev, pci_choose_state(pdev, state));
110         return ret;
111 }
112 
113 static int spi_resume(struct pci_dev *pdev)
114 {
115         struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
116         int ret;
117 
118         pci_set_power_state(pdev, PCI_D0);
119         pci_restore_state(pdev);
120         ret = pci_enable_device(pdev);
121         if (ret)
122                 return ret;
123         return dw_spi_resume_host(&dwpci->dws);
124 }
125 #else
126 #define spi_suspend     NULL
127 #define spi_resume      NULL
128 #endif
129 
130 static const struct pci_device_id pci_ids[] = {
131         /* Intel MID platform SPI controller 0 */
132         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0800) },
133         {},
134 };
135 
136 static struct pci_driver dw_spi_driver = {
137         .name =         DRIVER_NAME,
138         .id_table =     pci_ids,
139         .probe =        spi_pci_probe,
140         .remove =       spi_pci_remove,
141         .suspend =      spi_suspend,
142         .resume =       spi_resume,
143 };
144 
145 module_pci_driver(dw_spi_driver);
146 
147 MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>");
148 MODULE_DESCRIPTION("PCI interface driver for DW SPI Core");
149 MODULE_LICENSE("GPL v2");
150 

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