drivers/misc/cardreader/alcor_pci.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2018 Oleksij Rempel <linux@rempel-privat.de>
   4  *
   5  * Driver for Alcor Micro AU6601 and AU6621 controllers
   6  */
   7
   8 #include <linux/delay.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/io.h>
  11 #include <linux/irq.h>
  12 #include <linux/mfd/core.h>
  13 #include <linux/module.h>
  14 #include <linux/pci.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/pm.h>
  17
  18 #include <linux/alcor_pci.h>
  19
  20 static DEFINE_IDA(alcor_pci_idr);
  21
  22 static struct mfd_cell alcor_pci_cells[] = {
  23         [ALCOR_SD_CARD] = {
  24                 .name = DRV_NAME_ALCOR_PCI_SDMMC,
  25         },
  26         [ALCOR_MS_CARD] = {
  27                 .name = DRV_NAME_ALCOR_PCI_MS,
  28         },
  29 };
  30
  31 static const struct alcor_dev_cfg alcor_cfg = {
  32         .dma = 0,
  33 };
  34
  35 static const struct alcor_dev_cfg au6621_cfg = {
  36         .dma = 1,
  37 };
  38
  39 static const struct alcor_dev_cfg au6625_cfg = {
  40         .dma = 0,
  41 };
  42
  43 static const struct pci_device_id pci_ids[] = {
  44         { PCI_DEVICE(PCI_ID_ALCOR_MICRO, PCI_ID_AU6601),
  45                 .driver_data = (kernel_ulong_t)&alcor_cfg },
  46         { PCI_DEVICE(PCI_ID_ALCOR_MICRO, PCI_ID_AU6621),
  47                 .driver_data = (kernel_ulong_t)&au6621_cfg },
  48         { PCI_DEVICE(PCI_ID_ALCOR_MICRO, PCI_ID_AU6625),
  49                 .driver_data = (kernel_ulong_t)&au6625_cfg },
  50         {},
  51 };
  52 MODULE_DEVICE_TABLE(pci, pci_ids);
  53
  54 void alcor_write8(struct alcor_pci_priv *priv, u8 val, unsigned int addr)
  55 {
  56         writeb(val, priv->iobase + addr);
  57 }
  58 EXPORT_SYMBOL_GPL(alcor_write8);
  59
  60 void alcor_write16(struct alcor_pci_priv *priv, u16 val, unsigned int addr)
  61 {
  62         writew(val, priv->iobase + addr);
  63 }
  64 EXPORT_SYMBOL_GPL(alcor_write16);
  65
  66 void alcor_write32(struct alcor_pci_priv *priv, u32 val, unsigned int addr)
  67 {
  68         writel(val, priv->iobase + addr);
  69 }
  70 EXPORT_SYMBOL_GPL(alcor_write32);
  71
  72 void alcor_write32be(struct alcor_pci_priv *priv, u32 val, unsigned int addr)
  73 {
  74         iowrite32be(val, priv->iobase + addr);
  75 }
  76 EXPORT_SYMBOL_GPL(alcor_write32be);
  77
  78 u8 alcor_read8(struct alcor_pci_priv *priv, unsigned int addr)
  79 {
  80         return readb(priv->iobase + addr);
  81 }
  82 EXPORT_SYMBOL_GPL(alcor_read8);
  83
  84 u32 alcor_read32(struct alcor_pci_priv *priv, unsigned int addr)
  85 {
  86         return readl(priv->iobase + addr);
  87 }
  88 EXPORT_SYMBOL_GPL(alcor_read32);
  89
  90 u32 alcor_read32be(struct alcor_pci_priv *priv, unsigned int addr)
  91 {
  92         return ioread32be(priv->iobase + addr);
  93 }
  94 EXPORT_SYMBOL_GPL(alcor_read32be);
  95
  96 static int alcor_pci_probe(struct pci_dev *pdev,
  97                            const struct pci_device_id *ent)
  98 {
  99         struct alcor_dev_cfg *cfg;
 100         struct alcor_pci_priv *priv;
 101         int ret, i, bar = 0;
 102
 103         cfg = (void *)ent->driver_data;
 104
 105         ret = pcim_enable_device(pdev);
 106         if (ret)
 107                 return ret;
 108
 109         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 110         if (!priv)
 111                 return -ENOMEM;
 112
 113         ret = ida_alloc(&alcor_pci_idr, GFP_KERNEL);
 114         if (ret < 0)
 115                 return ret;
 116         priv->id = ret;
 117
 118         priv->pdev = pdev;
 119         priv->parent_pdev = pdev->bus->self;
 120         priv->dev = &pdev->dev;
 121         priv->cfg = cfg;
 122         priv->irq = pdev->irq;
 123
 124         ret = pci_request_regions(pdev, DRV_NAME_ALCOR_PCI);
 125         if (ret) {
 126                 dev_err(&pdev->dev, "Cannot request region\n");
 127                 ret = -ENOMEM;
 128                 goto error_free_ida;
 129         }
 130
 131         if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) {
 132                 dev_err(&pdev->dev, "BAR %d is not iomem. Aborting.\n", bar);
 133                 ret = -ENODEV;
 134                 goto error_release_regions;
 135         }
 136
 137         priv->iobase = pcim_iomap(pdev, bar, 0);
 138         if (!priv->iobase) {
 139                 ret = -ENOMEM;
 140                 goto error_release_regions;
 141         }
 142
 143         /* make sure irqs are disabled */
 144         alcor_write32(priv, 0, AU6601_REG_INT_ENABLE);
 145         alcor_write32(priv, 0, AU6601_MS_INT_ENABLE);
 146
 147         ret = dma_set_mask_and_coherent(priv->dev, AU6601_SDMA_MASK);
 148         if (ret) {
 149                 dev_err(priv->dev, "Failed to set DMA mask\n");
 150                 goto error_release_regions;
 151         }
 152
 153         pci_set_master(pdev);
 154         pci_set_drvdata(pdev, priv);
 155
 156         for (i = 0; i < ARRAY_SIZE(alcor_pci_cells); i++) {
 157                 alcor_pci_cells[i].platform_data = priv;
 158                 alcor_pci_cells[i].pdata_size = sizeof(*priv);
 159         }
 160         ret = mfd_add_devices(&pdev->dev, priv->id, alcor_pci_cells,
 161                         ARRAY_SIZE(alcor_pci_cells), NULL, 0, NULL);
 162         if (ret < 0)
 163                 goto error_clear_drvdata;
 164
 165         pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1);
 166
 167         return 0;
 168
 169 error_clear_drvdata:
 170         pci_clear_master(pdev);
 171         pci_set_drvdata(pdev, NULL);
 172 error_release_regions:
 173         pci_release_regions(pdev);
 174 error_free_ida:
 175         ida_free(&alcor_pci_idr, priv->id);
 176         return ret;
 177 }
 178
 179 static void alcor_pci_remove(struct pci_dev *pdev)
 180 {
 181         struct alcor_pci_priv *priv;
 182
 183         priv = pci_get_drvdata(pdev);
 184
 185         mfd_remove_devices(&pdev->dev);
 186
 187         ida_free(&alcor_pci_idr, priv->id);
 188
 189         pci_release_regions(pdev);
 190         pci_clear_master(pdev);
 191         pci_set_drvdata(pdev, NULL);
 192 }
 193
 194 #ifdef CONFIG_PM_SLEEP
 195 static int alcor_suspend(struct device *dev)
 196 {
 197         return 0;
 198 }
 199
 200 static int alcor_resume(struct device *dev)
 201 {
 202         struct alcor_pci_priv *priv = dev_get_drvdata(dev);
 203
 204         pci_disable_link_state(priv->pdev,
 205                                PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1);
 206
 207         return 0;
 208 }
 209 #endif /* CONFIG_PM_SLEEP */
 210
 211 static SIMPLE_DEV_PM_OPS(alcor_pci_pm_ops, alcor_suspend, alcor_resume);
 212
 213 static struct pci_driver alcor_driver = {
 214         .name   =       DRV_NAME_ALCOR_PCI,
 215         .id_table =     pci_ids,
 216         .probe  =       alcor_pci_probe,
 217         .remove =       alcor_pci_remove,
 218         .driver =       {
 219                 .pm     = &alcor_pci_pm_ops
 220         },
 221 };
 222
 223 module_pci_driver(alcor_driver);
 224
 225 MODULE_AUTHOR("Oleksij Rempel <linux@rempel-privat.de>");
 226 MODULE_DESCRIPTION("PCI driver for Alcor Micro AU6601 Secure Digital Host Controller Interface");
 227 MODULE_LICENSE("GPL");