diff options
Diffstat (limited to 'drivers/spi/spi-dw-pci.c')
| -rw-r--r-- | drivers/spi/spi-dw-pci.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/drivers/spi/spi-dw-pci.c b/drivers/spi/spi-dw-pci.c new file mode 100644 index 000000000..6d331e0db --- /dev/null +++ b/drivers/spi/spi-dw-pci.c @@ -0,0 +1,164 @@ +/* + * PCI interface driver for DW SPI Core + * + * Copyright (c) 2009, 2014 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. + */ + +#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; +}; + +struct spi_pci_desc { + int (*setup)(struct dw_spi *); + u16 num_cs; + u16 bus_num; +}; + +static struct spi_pci_desc spi_pci_mid_desc_1 = { + .setup = dw_spi_mid_init, + .num_cs = 5, + .bus_num = 0, +}; + +static struct spi_pci_desc spi_pci_mid_desc_2 = { + .setup = dw_spi_mid_init, + .num_cs = 2, + .bus_num = 1, +}; + +static int spi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent) +{ + struct dw_spi_pci *dwpci; + struct dw_spi *dws; + struct spi_pci_desc *desc = (struct spi_pci_desc *)ent->driver_data; + int pci_bar = 0; + int ret; + + 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 << pci_bar, pci_name(pdev)); + if (ret) + return ret; + + dws->regs = pcim_iomap_table(pdev)[pci_bar]; + + dws->irq = pdev->irq; + + /* + * Specific handling for paltforms, like dma setup, + * clock rate, FIFO depth. + */ + if (desc) { + dws->num_cs = desc->num_cs; + dws->bus_num = desc->bus_num; + + if (desc->setup) { + ret = desc->setup(dws); + if (ret) + return ret; + } + } else { + return -ENODEV; + } + + 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); + + dev_info(&pdev->dev, "found PCI SPI controller(ID: %04x:%04x)\n", + pdev->vendor, pdev->device); + + 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_SLEEP +static int spi_suspend(struct device *dev) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct dw_spi_pci *dwpci = pci_get_drvdata(pdev); + + return dw_spi_suspend_host(&dwpci->dws); +} + +static int spi_resume(struct device *dev) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct dw_spi_pci *dwpci = pci_get_drvdata(pdev); + + return dw_spi_resume_host(&dwpci->dws); +} +#endif + +static SIMPLE_DEV_PM_OPS(dw_spi_pm_ops, spi_suspend, spi_resume); + +static const struct pci_device_id pci_ids[] = { + /* Intel MID platform SPI controller 0 */ + /* + * The access to the device 8086:0801 is disabled by HW, since it's + * exclusively used by SCU to communicate with MSIC. + */ + /* Intel MID platform SPI controller 1 */ + { PCI_VDEVICE(INTEL, 0x0800), (kernel_ulong_t)&spi_pci_mid_desc_1}, + /* Intel MID platform SPI controller 2 */ + { PCI_VDEVICE(INTEL, 0x0812), (kernel_ulong_t)&spi_pci_mid_desc_2}, + {}, +}; + +static struct pci_driver dw_spi_driver = { + .name = DRIVER_NAME, + .id_table = pci_ids, + .probe = spi_pci_probe, + .remove = spi_pci_remove, + .driver = { + .pm = &dw_spi_pm_ops, + }, +}; + +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"); |