| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * PCI interface driver for DW SPI Core |
| * |
| * Copyright (c) 2009, 2014 Intel Corporation. |
| */ |
| |
| #include <linux/interrupt.h> |
| #include <linux/pci.h> |
| #include <linux/pm_runtime.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 spi_pci_desc { |
| int (*setup)(struct dw_spi *); |
| u16 num_cs; |
| u16 bus_num; |
| u32 max_freq; |
| }; |
| |
| 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 struct spi_pci_desc spi_pci_ehl_desc = { |
| .num_cs = 2, |
| .bus_num = -1, |
| .max_freq = 100000000, |
| }; |
| |
| static int spi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent) |
| { |
| 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; |
| |
| dws = devm_kzalloc(&pdev->dev, sizeof(*dws), GFP_KERNEL); |
| if (!dws) |
| return -ENOMEM; |
| |
| /* Get basic io resource and map it */ |
| dws->paddr = pci_resource_start(pdev, pci_bar); |
| pci_set_master(pdev); |
| |
| ret = pcim_iomap_regions(pdev, 1 << pci_bar, pci_name(pdev)); |
| if (ret) |
| return ret; |
| |
| ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES); |
| if (ret < 0) |
| return ret; |
| |
| dws->regs = pcim_iomap_table(pdev)[pci_bar]; |
| dws->irq = pci_irq_vector(pdev, 0); |
| |
| /* |
| * Specific handling for platforms, like dma setup, |
| * clock rate, FIFO depth. |
| */ |
| if (desc) { |
| dws->num_cs = desc->num_cs; |
| dws->bus_num = desc->bus_num; |
| dws->max_freq = desc->max_freq; |
| |
| if (desc->setup) { |
| ret = desc->setup(dws); |
| if (ret) |
| return ret; |
| } |
| } else { |
| pci_free_irq_vectors(pdev); |
| return -ENODEV; |
| } |
| |
| ret = dw_spi_add_host(&pdev->dev, dws); |
| if (ret) { |
| pci_free_irq_vectors(pdev); |
| return ret; |
| } |
| |
| /* PCI hook and SPI hook use the same drv data */ |
| pci_set_drvdata(pdev, dws); |
| |
| dev_info(&pdev->dev, "found PCI SPI controller(ID: %04x:%04x)\n", |
| pdev->vendor, pdev->device); |
| |
| pm_runtime_set_autosuspend_delay(&pdev->dev, 1000); |
| pm_runtime_use_autosuspend(&pdev->dev); |
| pm_runtime_put_autosuspend(&pdev->dev); |
| pm_runtime_allow(&pdev->dev); |
| |
| return 0; |
| } |
| |
| static void spi_pci_remove(struct pci_dev *pdev) |
| { |
| struct dw_spi *dws = pci_get_drvdata(pdev); |
| |
| pm_runtime_forbid(&pdev->dev); |
| pm_runtime_get_noresume(&pdev->dev); |
| |
| dw_spi_remove_host(dws); |
| pci_free_irq_vectors(pdev); |
| } |
| |
| #ifdef CONFIG_PM_SLEEP |
| static int spi_suspend(struct device *dev) |
| { |
| struct dw_spi *dws = dev_get_drvdata(dev); |
| |
| return dw_spi_suspend_host(dws); |
| } |
| |
| static int spi_resume(struct device *dev) |
| { |
| struct dw_spi *dws = dev_get_drvdata(dev); |
| |
| return dw_spi_resume_host(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}, |
| /* Intel Elkhart Lake PSE SPI controllers */ |
| { PCI_VDEVICE(INTEL, 0x4b84), (kernel_ulong_t)&spi_pci_ehl_desc}, |
| { PCI_VDEVICE(INTEL, 0x4b85), (kernel_ulong_t)&spi_pci_ehl_desc}, |
| { PCI_VDEVICE(INTEL, 0x4b86), (kernel_ulong_t)&spi_pci_ehl_desc}, |
| { PCI_VDEVICE(INTEL, 0x4b87), (kernel_ulong_t)&spi_pci_ehl_desc}, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(pci, pci_ids); |
| |
| 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"); |