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 25 #include "spi-dw.h" 26 27 #define DRIVER_NAME "dw_spi_pci" 28 29 struct dw_spi_pci { 30 struct pci_dev *pdev; 31 struct dw_spi dws; 32 }; 33 34 static int __devinit spi_pci_probe(struct pci_dev *pdev, 35 const struct pci_device_id *ent) 36 { 37 struct dw_spi_pci *dwpci; 38 struct dw_spi *dws; 39 int pci_bar = 0; 40 int ret; 41 42 printk(KERN_INFO "DW: found PCI SPI controller(ID: %04x:%04x)\n", 43 pdev->vendor, pdev->device); 44 45 ret = pci_enable_device(pdev); 46 if (ret) 47 return ret; 48 49 dwpci = kzalloc(sizeof(struct dw_spi_pci), GFP_KERNEL); 50 if (!dwpci) { 51 ret = -ENOMEM; 52 goto err_disable; 53 } 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 dws->iolen = pci_resource_len(pdev, pci_bar); 61 62 ret = pci_request_region(pdev, pci_bar, dev_name(&pdev->dev)); 63 if (ret) 64 goto err_kfree; 65 66 dws->regs = ioremap_nocache((unsigned long)dws->paddr, 67 pci_resource_len(pdev, pci_bar)); 68 if (!dws->regs) { 69 ret = -ENOMEM; 70 goto err_release_reg; 71 } 72 73 dws->parent_dev = &pdev->dev; 74 dws->bus_num = 0; 75 dws->num_cs = 4; 76 dws->irq = pdev->irq; 77 78 /* 79 * Specific handling for Intel MID paltforms, like dma setup, 80 * clock rate, FIFO depth. 81 */ 82 if (pdev->device == 0x0800) { 83 ret = dw_spi_mid_init(dws); 84 if (ret) 85 goto err_unmap; 86 } 87 88 ret = dw_spi_add_host(dws); 89 if (ret) 90 goto err_unmap; 91 92 /* PCI hook and SPI hook use the same drv data */ 93 pci_set_drvdata(pdev, dwpci); 94 return 0; 95 96 err_unmap: 97 iounmap(dws->regs); 98 err_release_reg: 99 pci_release_region(pdev, pci_bar); 100 err_kfree: 101 kfree(dwpci); 102 err_disable: 103 pci_disable_device(pdev); 104 return ret; 105 } 106 107 static void __devexit spi_pci_remove(struct pci_dev *pdev) 108 { 109 struct dw_spi_pci *dwpci = pci_get_drvdata(pdev); 110 111 pci_set_drvdata(pdev, NULL); 112 dw_spi_remove_host(&dwpci->dws); 113 iounmap(dwpci->dws.regs); 114 pci_release_region(pdev, 0); 115 kfree(dwpci); 116 pci_disable_device(pdev); 117 } 118 119 #ifdef CONFIG_PM 120 static int spi_suspend(struct pci_dev *pdev, pm_message_t state) 121 { 122 struct dw_spi_pci *dwpci = pci_get_drvdata(pdev); 123 int ret; 124 125 ret = dw_spi_suspend_host(&dwpci->dws); 126 if (ret) 127 return ret; 128 pci_save_state(pdev); 129 pci_disable_device(pdev); 130 pci_set_power_state(pdev, pci_choose_state(pdev, state)); 131 return ret; 132 } 133 134 static int spi_resume(struct pci_dev *pdev) 135 { 136 struct dw_spi_pci *dwpci = pci_get_drvdata(pdev); 137 int ret; 138 139 pci_set_power_state(pdev, PCI_D0); 140 pci_restore_state(pdev); 141 ret = pci_enable_device(pdev); 142 if (ret) 143 return ret; 144 return dw_spi_resume_host(&dwpci->dws); 145 } 146 #else 147 #define spi_suspend NULL 148 #define spi_resume NULL 149 #endif 150 151 static const struct pci_device_id pci_ids[] __devinitdata = { 152 /* Intel MID platform SPI controller 0 */ 153 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0800) }, 154 {}, 155 }; 156 157 static struct pci_driver dw_spi_driver = { 158 .name = DRIVER_NAME, 159 .id_table = pci_ids, 160 .probe = spi_pci_probe, 161 .remove = __devexit_p(spi_pci_remove), 162 .suspend = spi_suspend, 163 .resume = spi_resume, 164 }; 165 166 static int __init mrst_spi_init(void) 167 { 168 return pci_register_driver(&dw_spi_driver); 169 } 170 171 static void __exit mrst_spi_exit(void) 172 { 173 pci_unregister_driver(&dw_spi_driver); 174 } 175 176 module_init(mrst_spi_init); 177 module_exit(mrst_spi_exit); 178 179 MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>"); 180 MODULE_DESCRIPTION("PCI interface driver for DW SPI Core"); 181 MODULE_LICENSE("GPL v2"); 182