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/pci.h> 9 #include <linux/pm_runtime.h> 10 #include <linux/slab.h> 11 #include <linux/spi/spi.h> 12 #include <linux/module.h> 13 14 #include "spi-dw.h" 15 16 #define DRIVER_NAME "dw_spi_pci" 17 18 /* HW info for MRST Clk Control Unit, 32b reg per controller */ 19 #define MRST_SPI_CLK_BASE 100000000 /* 100m */ 20 #define MRST_CLK_SPI_REG 0xff11d86c 21 #define CLK_SPI_BDIV_OFFSET 0 22 #define CLK_SPI_BDIV_MASK 0x00000007 23 #define CLK_SPI_CDIV_OFFSET 9 24 #define CLK_SPI_CDIV_MASK 0x00000e00 25 #define CLK_SPI_DISABLE_OFFSET 8 26 27 struct spi_pci_desc { 28 int (*setup)(struct dw_spi *); 29 u16 num_cs; 30 u16 bus_num; 31 u32 max_freq; 32 }; 33 34 static int spi_mid_init(struct dw_spi *dws) 35 { 36 void __iomem *clk_reg; 37 u32 clk_cdiv; 38 39 clk_reg = ioremap(MRST_CLK_SPI_REG, 16); 40 if (!clk_reg) 41 return -ENOMEM; 42 43 /* Get SPI controller operating freq info */ 44 clk_cdiv = readl(clk_reg + dws->bus_num * sizeof(u32)); 45 clk_cdiv &= CLK_SPI_CDIV_MASK; 46 clk_cdiv >>= CLK_SPI_CDIV_OFFSET; 47 dws->max_freq = MRST_SPI_CLK_BASE / (clk_cdiv + 1); 48 49 iounmap(clk_reg); 50 51 dw_spi_dma_setup_mfld(dws); 52 53 return 0; 54 } 55 56 static int spi_generic_init(struct dw_spi *dws) 57 { 58 dw_spi_dma_setup_generic(dws); 59 60 return 0; 61 } 62 63 static struct spi_pci_desc spi_pci_mid_desc_1 = { 64 .setup = spi_mid_init, 65 .num_cs = 5, 66 .bus_num = 0, 67 }; 68 69 static struct spi_pci_desc spi_pci_mid_desc_2 = { 70 .setup = spi_mid_init, 71 .num_cs = 2, 72 .bus_num = 1, 73 }; 74 75 static struct spi_pci_desc spi_pci_ehl_desc = { 76 .setup = spi_generic_init, 77 .num_cs = 2, 78 .bus_num = -1, 79 .max_freq = 100000000, 80 }; 81 82 static int spi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 83 { 84 struct dw_spi *dws; 85 struct spi_pci_desc *desc = (struct spi_pci_desc *)ent->driver_data; 86 int pci_bar = 0; 87 int ret; 88 89 ret = pcim_enable_device(pdev); 90 if (ret) 91 return ret; 92 93 dws = devm_kzalloc(&pdev->dev, sizeof(*dws), GFP_KERNEL); 94 if (!dws) 95 return -ENOMEM; 96 97 /* Get basic io resource and map it */ 98 dws->paddr = pci_resource_start(pdev, pci_bar); 99 pci_set_master(pdev); 100 101 ret = pcim_iomap_regions(pdev, 1 << pci_bar, pci_name(pdev)); 102 if (ret) 103 return ret; 104 105 ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES); 106 if (ret < 0) 107 return ret; 108 109 dws->regs = pcim_iomap_table(pdev)[pci_bar]; 110 dws->irq = pci_irq_vector(pdev, 0); 111 112 /* 113 * Specific handling for platforms, like dma setup, 114 * clock rate, FIFO depth. 115 */ 116 if (desc) { 117 dws->num_cs = desc->num_cs; 118 dws->bus_num = desc->bus_num; 119 dws->max_freq = desc->max_freq; 120 121 if (desc->setup) { 122 ret = desc->setup(dws); 123 if (ret) 124 goto err_free_irq_vectors; 125 } 126 } else { 127 ret = -ENODEV; 128 goto err_free_irq_vectors; 129 } 130 131 ret = dw_spi_add_host(&pdev->dev, dws); 132 if (ret) 133 goto err_free_irq_vectors; 134 135 /* PCI hook and SPI hook use the same drv data */ 136 pci_set_drvdata(pdev, dws); 137 138 dev_info(&pdev->dev, "found PCI SPI controller(ID: %04x:%04x)\n", 139 pdev->vendor, pdev->device); 140 141 pm_runtime_set_autosuspend_delay(&pdev->dev, 1000); 142 pm_runtime_use_autosuspend(&pdev->dev); 143 pm_runtime_put_autosuspend(&pdev->dev); 144 pm_runtime_allow(&pdev->dev); 145 146 return 0; 147 148 err_free_irq_vectors: 149 pci_free_irq_vectors(pdev); 150 return ret; 151 } 152 153 static void spi_pci_remove(struct pci_dev *pdev) 154 { 155 struct dw_spi *dws = pci_get_drvdata(pdev); 156 157 pm_runtime_forbid(&pdev->dev); 158 pm_runtime_get_noresume(&pdev->dev); 159 160 dw_spi_remove_host(dws); 161 pci_free_irq_vectors(pdev); 162 } 163 164 #ifdef CONFIG_PM_SLEEP 165 static int spi_suspend(struct device *dev) 166 { 167 struct dw_spi *dws = dev_get_drvdata(dev); 168 169 return dw_spi_suspend_host(dws); 170 } 171 172 static int spi_resume(struct device *dev) 173 { 174 struct dw_spi *dws = dev_get_drvdata(dev); 175 176 return dw_spi_resume_host(dws); 177 } 178 #endif 179 180 static SIMPLE_DEV_PM_OPS(dw_spi_pm_ops, spi_suspend, spi_resume); 181 182 static const struct pci_device_id pci_ids[] = { 183 /* Intel MID platform SPI controller 0 */ 184 /* 185 * The access to the device 8086:0801 is disabled by HW, since it's 186 * exclusively used by SCU to communicate with MSIC. 187 */ 188 /* Intel MID platform SPI controller 1 */ 189 { PCI_VDEVICE(INTEL, 0x0800), (kernel_ulong_t)&spi_pci_mid_desc_1}, 190 /* Intel MID platform SPI controller 2 */ 191 { PCI_VDEVICE(INTEL, 0x0812), (kernel_ulong_t)&spi_pci_mid_desc_2}, 192 /* Intel Elkhart Lake PSE SPI controllers */ 193 { PCI_VDEVICE(INTEL, 0x4b84), (kernel_ulong_t)&spi_pci_ehl_desc}, 194 { PCI_VDEVICE(INTEL, 0x4b85), (kernel_ulong_t)&spi_pci_ehl_desc}, 195 { PCI_VDEVICE(INTEL, 0x4b86), (kernel_ulong_t)&spi_pci_ehl_desc}, 196 { PCI_VDEVICE(INTEL, 0x4b87), (kernel_ulong_t)&spi_pci_ehl_desc}, 197 {}, 198 }; 199 MODULE_DEVICE_TABLE(pci, pci_ids); 200 201 static struct pci_driver dw_spi_driver = { 202 .name = DRIVER_NAME, 203 .id_table = pci_ids, 204 .probe = spi_pci_probe, 205 .remove = spi_pci_remove, 206 .driver = { 207 .pm = &dw_spi_pm_ops, 208 }, 209 }; 210 211 module_pci_driver(dw_spi_driver); 212 213 MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>"); 214 MODULE_DESCRIPTION("PCI interface driver for DW SPI Core"); 215 MODULE_LICENSE("GPL v2"); 216