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