diff options
Diffstat (limited to 'drivers/spi/spi-dw-pci.c')
| -rw-r--r-- | drivers/spi/spi-dw-pci.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/drivers/spi/spi-dw-pci.c b/drivers/spi/spi-dw-pci.c new file mode 100644 index 00000000000..3f3dc1226ed --- /dev/null +++ b/drivers/spi/spi-dw-pci.c @@ -0,0 +1,147 @@ +/* + * 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 <linux/module.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 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; + + dev_info(&pdev->dev, "found PCI SPI controller(ID: %04x:%04x)\n", + pdev->vendor, pdev->device); + + ret = pcim_enable_device(pdev); + if (ret) + return ret; + + dwpci = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_pci), + GFP_KERNEL); + if (!dwpci) + return -ENOMEM; + + dwpci->pdev = pdev; + dws = &dwpci->dws; + + /* Get basic io resource and map it */ + dws->paddr = pci_resource_start(pdev, pci_bar); + + ret = pcim_iomap_regions(pdev, 1, dev_name(&pdev->dev)); + if (ret) + return ret; + + 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) + return ret; + } + + ret = dw_spi_add_host(&pdev->dev, dws); + if (ret) + return ret; + + /* PCI hook and SPI hook use the same drv data */ + pci_set_drvdata(pdev, dwpci); + + return 0; +} + +static void spi_pci_remove(struct pci_dev *pdev) +{ + struct dw_spi_pci *dwpci = pci_get_drvdata(pdev); + + dw_spi_remove_host(&dwpci->dws); +} + +#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[] = { + /* 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 = spi_pci_remove, + .suspend = spi_suspend, + .resume = spi_resume, +}; + +module_pci_driver(dw_spi_driver); + +MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>"); +MODULE_DESCRIPTION("PCI interface driver for DW SPI Core"); +MODULE_LICENSE("GPL v2"); |