1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * PCI interface driver for DW SPI Core 4 * 5 * Copyright (c) 2009, 2014 Intel Corporation. 6 */ 7 8 #include <linux/interrupt.h> 9 #include <linux/pci.h> 10 #include <linux/pm_runtime.h> 11 #include <linux/slab.h> 12 #include <linux/spi/spi.h> 13 #include <linux/module.h> 14 15 #include "spi-dw.h" 16 17 #define DRIVER_NAME "dw_spi_pci" 18 19 struct spi_pci_desc { 20 int (*setup)(struct dw_spi *); 21 u16 num_cs; 22 u16 bus_num; 23 u32 max_freq; 24 }; 25 26 static struct spi_pci_desc spi_pci_mid_desc_1 = { 27 .setup = dw_spi_mid_init, 28 .num_cs = 5, 29 .bus_num = 0, 30 }; 31 32 static struct spi_pci_desc spi_pci_mid_desc_2 = { 33 .setup = dw_spi_mid_init, 34 .num_cs = 2, 35 .bus_num = 1, 36 }; 37 38 static struct spi_pci_desc spi_pci_ehl_desc = { 39 .num_cs = 2, 40 .bus_num = -1, 41 .max_freq = 100000000, 42 }; 43 44 static int spi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 45 { 46 struct dw_spi *dws; 47 struct spi_pci_desc *desc = (struct spi_pci_desc *)ent->driver_data; 48 int pci_bar = 0; 49 int ret; 50 51 ret = pcim_enable_device(pdev); 52 if (ret) 53 return ret; 54 55 dws = devm_kzalloc(&pdev->dev, sizeof(*dws), GFP_KERNEL); 56 if (!dws) 57 return -ENOMEM; 58 59 /* Get basic io resource and map it */ 60 dws->paddr = pci_resource_start(pdev, pci_bar); 61 pci_set_master(pdev); 62 63 ret = pcim_iomap_regions(pdev, 1 << pci_bar, pci_name(pdev)); 64 if (ret) 65 return ret; 66 67 ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES); 68 if (ret < 0) 69 return ret; 70 71 dws->regs = pcim_iomap_table(pdev)[pci_bar]; 72 dws->irq = pci_irq_vector(pdev, 0); 73 74 /* 75 * Specific handling for platforms, like dma setup, 76 * clock rate, FIFO depth. 77 */ 78 if (desc) { 79 dws->num_cs = desc->num_cs; 80 dws->bus_num = desc->bus_num; 81 dws->max_freq = desc->max_freq; 82 83 if (desc->setup) { 84 ret = desc->setup(dws); 85 if (ret) 86 return ret; 87 } 88 } else { 89 pci_free_irq_vectors(pdev); 90 return -ENODEV; 91 } 92 93 ret = dw_spi_add_host(&pdev->dev, dws); 94 if (ret) { 95 pci_free_irq_vectors(pdev); 96 return ret; 97 } 98 99 /* PCI hook and SPI hook use the same drv data */ 100 pci_set_drvdata(pdev, dws); 101 102 dev_info(&pdev->dev, "found PCI SPI controller(ID: %04x:%04x)\n", 103 pdev->vendor, pdev->device); 104 105 pm_runtime_set_autosuspend_delay(&pdev->dev, 1000); 106 pm_runtime_use_autosuspend(&pdev->dev); 107 pm_runtime_put_autosuspend(&pdev->dev); 108 pm_runtime_allow(&pdev->dev); 109 110 return 0; 111 } 112 113 static void spi_pci_remove(struct pci_dev *pdev) 114 { 115 struct dw_spi *dws = pci_get_drvdata(pdev); 116 117 pm_runtime_forbid(&pdev->dev); 118 pm_runtime_get_noresume(&pdev->dev); 119 120 dw_spi_remove_host(dws); 121 pci_free_irq_vectors(pdev); 122 } 123 124 #ifdef CONFIG_PM_SLEEP 125 static int spi_suspend(struct device *dev) 126 { 127 struct dw_spi *dws = dev_get_drvdata(dev); 128 129 return dw_spi_suspend_host(dws); 130 } 131 132 static int spi_resume(struct device *dev) 133 { 134 struct dw_spi *dws = dev_get_drvdata(dev); 135 136 return dw_spi_resume_host(dws); 137 } 138 #endif 139 140 static SIMPLE_DEV_PM_OPS(dw_spi_pm_ops, spi_suspend, spi_resume); 141 142 static const struct pci_device_id pci_ids[] = { 143 /* Intel MID platform SPI controller 0 */ 144 /* 145 * The access to the device 8086:0801 is disabled by HW, since it's 146 * exclusively used by SCU to communicate with MSIC. 147 */ 148 /* Intel MID platform SPI controller 1 */ 149 { PCI_VDEVICE(INTEL, 0x0800), (kernel_ulong_t)&spi_pci_mid_desc_1}, 150 /* Intel MID platform SPI controller 2 */ 151 { PCI_VDEVICE(INTEL, 0x0812), (kernel_ulong_t)&spi_pci_mid_desc_2}, 152 /* Intel Elkhart Lake PSE SPI controllers */ 153 { PCI_VDEVICE(INTEL, 0x4b84), (kernel_ulong_t)&spi_pci_ehl_desc}, 154 { PCI_VDEVICE(INTEL, 0x4b85), (kernel_ulong_t)&spi_pci_ehl_desc}, 155 { PCI_VDEVICE(INTEL, 0x4b86), (kernel_ulong_t)&spi_pci_ehl_desc}, 156 { PCI_VDEVICE(INTEL, 0x4b87), (kernel_ulong_t)&spi_pci_ehl_desc}, 157 {}, 158 }; 159 MODULE_DEVICE_TABLE(pci, pci_ids); 160 161 static struct pci_driver dw_spi_driver = { 162 .name = DRIVER_NAME, 163 .id_table = pci_ids, 164 .probe = spi_pci_probe, 165 .remove = spi_pci_remove, 166 .driver = { 167 .pm = &dw_spi_pm_ops, 168 }, 169 }; 170 171 module_pci_driver(dw_spi_driver); 172 173 MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>"); 174 MODULE_DESCRIPTION("PCI interface driver for DW SPI Core"); 175 MODULE_LICENSE("GPL v2"); 176