/* * PCI interface driver for DW SPI Core * * Copyright (c) 2009, Intel Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, * Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. */ #include <linux/interrupt.h> #include <linux/pci.h> #include <linux/slab.h> #include <linux/spi/spi.h> #include "spi-dw.h" #define DRIVER_NAME "dw_spi_pci" struct dw_spi_pci { struct pci_dev *pdev; struct dw_spi dws; }; static int __devinit spi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent) { struct dw_spi_pci *dwpci; struct dw_spi *dws; int pci_bar = 0; int ret; printk(KERN_INFO "DW: found PCI SPI controller(ID: %04x:%04x)\n", pdev->vendor, pdev->device); ret = pci_enable_device(pdev); if (ret) return ret; dwpci = kzalloc(sizeof(struct dw_spi_pci), GFP_KERNEL); if (!dwpci) { ret = -ENOMEM; goto err_disable; } dwpci->pdev = pdev; dws = &dwpci->dws; /* Get basic io resource and map it */ dws->paddr = pci_resource_start(pdev, pci_bar); dws->iolen = pci_resource_len(pdev, pci_bar); ret = pci_request_region(pdev, pci_bar, dev_name(&pdev->dev)); if (ret) goto err_kfree; dws->regs = ioremap_nocache((unsigned long)dws->paddr, pci_resource_len(pdev, pci_bar)); if (!dws->regs) { ret = -ENOMEM; goto err_release_reg; } dws->parent_dev = &pdev->dev; dws->bus_num = 0; dws->num_cs = 4; dws->irq = pdev->irq; /* * Specific handling for Intel MID paltforms, like dma setup, * clock rate, FIFO depth. */ if (pdev->device == 0x0800) { ret = dw_spi_mid_init(dws); if (ret) goto err_unmap; } ret = dw_spi_add_host(dws); if (ret) goto err_unmap; /* PCI hook and SPI hook use the same drv data */ pci_set_drvdata(pdev, dwpci); return 0; err_unmap: iounmap(dws->regs); err_release_reg: pci_release_region(pdev, pci_bar); err_kfree: kfree(dwpci); err_disable: pci_disable_device(pdev); return ret; } static void __devexit spi_pci_remove(struct pci_dev *pdev) { struct dw_spi_pci *dwpci = pci_get_drvdata(pdev); pci_set_drvdata(pdev, NULL); dw_spi_remove_host(&dwpci->dws); iounmap(dwpci->dws.regs); pci_release_region(pdev, 0); kfree(dwpci); pci_disable_device(pdev); } #ifdef CONFIG_PM static int spi_suspend(struct pci_dev *pdev, pm_message_t state) { struct dw_spi_pci *dwpci = pci_get_drvdata(pdev); int ret; ret = dw_spi_suspend_host(&dwpci->dws); if (ret) return ret; pci_save_state(pdev); pci_disable_device(pdev); pci_set_power_state(pdev, pci_choose_state(pdev, state)); return ret; } static int spi_resume(struct pci_dev *pdev) { struct dw_spi_pci *dwpci = pci_get_drvdata(pdev); int ret; pci_set_power_state(pdev, PCI_D0); pci_restore_state(pdev); ret = pci_enable_device(pdev); if (ret) return ret; return dw_spi_resume_host(&dwpci->dws); } #else #define spi_suspend NULL #define spi_resume NULL #endif static const struct pci_device_id pci_ids[] __devinitdata = { /* Intel MID platform SPI controller 0 */ { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0800) }, {}, }; static struct pci_driver dw_spi_driver = { .name = DRIVER_NAME, .id_table = pci_ids, .probe = spi_pci_probe, .remove = __devexit_p(spi_pci_remove), .suspend = spi_suspend, .resume = spi_resume, }; static int __init mrst_spi_init(void) { return pci_register_driver(&dw_spi_driver); } static void __exit mrst_spi_exit(void) { pci_unregister_driver(&dw_spi_driver); } module_init(mrst_spi_init); module_exit(mrst_spi_exit); MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>"); MODULE_DESCRIPTION("PCI interface driver for DW SPI Core"); MODULE_LICENSE("GPL v2");