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