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/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");