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 printk(KERN_INFO "DW: found PCI SPI controller(ID: %04x:%04x)\n", 44 pdev->vendor, pdev->device); 45 46 ret = pci_enable_device(pdev); 47 if (ret) 48 return ret; 49 50 dwpci = kzalloc(sizeof(struct dw_spi_pci), GFP_KERNEL); 51 if (!dwpci) { 52 ret = -ENOMEM; 53 goto err_disable; 54 } 55 56 dwpci->pdev = pdev; 57 dws = &dwpci->dws; 58 59 /* Get basic io resource and map it */ 60 dws->paddr = pci_resource_start(pdev, pci_bar); 61 dws->iolen = pci_resource_len(pdev, pci_bar); 62 63 ret = pci_request_region(pdev, pci_bar, dev_name(&pdev->dev)); 64 if (ret) 65 goto err_kfree; 66 67 dws->regs = ioremap_nocache((unsigned long)dws->paddr, 68 pci_resource_len(pdev, pci_bar)); 69 if (!dws->regs) { 70 ret = -ENOMEM; 71 goto err_release_reg; 72 } 73 74 dws->parent_dev = &pdev->dev; 75 dws->bus_num = 0; 76 dws->num_cs = 4; 77 dws->irq = pdev->irq; 78 79 /* 80 * Specific handling for Intel MID paltforms, like dma setup, 81 * clock rate, FIFO depth. 82 */ 83 if (pdev->device == 0x0800) { 84 ret = dw_spi_mid_init(dws); 85 if (ret) 86 goto err_unmap; 87 } 88 89 ret = dw_spi_add_host(dws); 90 if (ret) 91 goto err_unmap; 92 93 /* PCI hook and SPI hook use the same drv data */ 94 pci_set_drvdata(pdev, dwpci); 95 return 0; 96 97 err_unmap: 98 iounmap(dws->regs); 99 err_release_reg: 100 pci_release_region(pdev, pci_bar); 101 err_kfree: 102 kfree(dwpci); 103 err_disable: 104 pci_disable_device(pdev); 105 return ret; 106 } 107 108 static void spi_pci_remove(struct pci_dev *pdev) 109 { 110 struct dw_spi_pci *dwpci = pci_get_drvdata(pdev); 111 112 pci_set_drvdata(pdev, NULL); 113 dw_spi_remove_host(&dwpci->dws); 114 iounmap(dwpci->dws.regs); 115 pci_release_region(pdev, 0); 116 kfree(dwpci); 117 pci_disable_device(pdev); 118 } 119 120 #ifdef CONFIG_PM 121 static int spi_suspend(struct pci_dev *pdev, pm_message_t state) 122 { 123 struct dw_spi_pci *dwpci = pci_get_drvdata(pdev); 124 int ret; 125 126 ret = dw_spi_suspend_host(&dwpci->dws); 127 if (ret) 128 return ret; 129 pci_save_state(pdev); 130 pci_disable_device(pdev); 131 pci_set_power_state(pdev, pci_choose_state(pdev, state)); 132 return ret; 133 } 134 135 static int spi_resume(struct pci_dev *pdev) 136 { 137 struct dw_spi_pci *dwpci = pci_get_drvdata(pdev); 138 int ret; 139 140 pci_set_power_state(pdev, PCI_D0); 141 pci_restore_state(pdev); 142 ret = pci_enable_device(pdev); 143 if (ret) 144 return ret; 145 return dw_spi_resume_host(&dwpci->dws); 146 } 147 #else 148 #define spi_suspend NULL 149 #define spi_resume NULL 150 #endif 151 152 static DEFINE_PCI_DEVICE_TABLE(pci_ids) = { 153 /* Intel MID platform SPI controller 0 */ 154 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0800) }, 155 {}, 156 }; 157 158 static struct pci_driver dw_spi_driver = { 159 .name = DRIVER_NAME, 160 .id_table = pci_ids, 161 .probe = spi_pci_probe, 162 .remove = spi_pci_remove, 163 .suspend = spi_suspend, 164 .resume = spi_resume, 165 }; 166 167 module_pci_driver(dw_spi_driver); 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"); 172