drivers/spi/spi-dw-pci.c

   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 <[email protected]>");
 174 MODULE_DESCRIPTION("PCI interface driver for DW SPI Core");
 175 MODULE_LICENSE("GPL v2");