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