drivers/mfd/cs5535-mfd.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * cs5535-mfd.c - core MFD driver for CS5535/CS5536 southbridges
   4  *
   5  * The CS5535 and CS5536 has an ISA bridge on the PCI bus that is
   6  * used for accessing GPIOs, MFGPTs, ACPI, etc.  Each subdevice has
   7  * an IO range that's specified in a single BAR.  The BAR order is
   8  * hardcoded in the CS553x specifications.
   9  *
  10  * Copyright (c) 2010  Andres Salomon <dilinger@queued.net>
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/mfd/core.h>
  15 #include <linux/module.h>
  16 #include <linux/pci.h>
  17 #include <asm/olpc.h>
  18
  19 #define DRV_NAME "cs5535-mfd"
  20
  21 enum cs5535_mfd_bars {
  22         SMB_BAR = 0,
  23         GPIO_BAR = 1,
  24         MFGPT_BAR = 2,
  25         PMS_BAR = 4,
  26         ACPI_BAR = 5,
  27         NR_BARS,
  28 };
  29
  30 static int cs5535_mfd_res_enable(struct platform_device *pdev)
  31 {
  32         struct resource *res;
  33
  34         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
  35         if (!res) {
  36                 dev_err(&pdev->dev, "can't fetch device resource info\n");
  37                 return -EIO;
  38         }
  39
  40         if (!request_region(res->start, resource_size(res), DRV_NAME)) {
  41                 dev_err(&pdev->dev, "can't request region\n");
  42                 return -EIO;
  43         }
  44
  45         return 0;
  46 }
  47
  48 static int cs5535_mfd_res_disable(struct platform_device *pdev)
  49 {
  50         struct resource *res;
  51
  52         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
  53         if (!res) {
  54                 dev_err(&pdev->dev, "can't fetch device resource info\n");
  55                 return -EIO;
  56         }
  57
  58         release_region(res->start, resource_size(res));
  59         return 0;
  60 }
  61
  62 static struct resource cs5535_mfd_resources[NR_BARS];
  63
  64 static struct mfd_cell cs5535_mfd_cells[] = {
  65         {
  66                 .id = SMB_BAR,
  67                 .name = "cs5535-smb",
  68                 .num_resources = 1,
  69                 .resources = &cs5535_mfd_resources[SMB_BAR],
  70         },
  71         {
  72                 .id = GPIO_BAR,
  73                 .name = "cs5535-gpio",
  74                 .num_resources = 1,
  75                 .resources = &cs5535_mfd_resources[GPIO_BAR],
  76         },
  77         {
  78                 .id = MFGPT_BAR,
  79                 .name = "cs5535-mfgpt",
  80                 .num_resources = 1,
  81                 .resources = &cs5535_mfd_resources[MFGPT_BAR],
  82         },
  83         {
  84                 .id = PMS_BAR,
  85                 .name = "cs5535-pms",
  86                 .num_resources = 1,
  87                 .resources = &cs5535_mfd_resources[PMS_BAR],
  88
  89                 .enable = cs5535_mfd_res_enable,
  90                 .disable = cs5535_mfd_res_disable,
  91         },
  92         {
  93                 .id = ACPI_BAR,
  94                 .name = "cs5535-acpi",
  95                 .num_resources = 1,
  96                 .resources = &cs5535_mfd_resources[ACPI_BAR],
  97
  98                 .enable = cs5535_mfd_res_enable,
  99                 .disable = cs5535_mfd_res_disable,
 100         },
 101 };
 102
 103 static const char *olpc_acpi_clones[] = {
 104         "olpc-xo1-pm-acpi",
 105         "olpc-xo1-sci-acpi"
 106 };
 107
 108 static int cs5535_mfd_probe(struct pci_dev *pdev,
 109                 const struct pci_device_id *id)
 110 {
 111         int err, i;
 112
 113         err = pci_enable_device(pdev);
 114         if (err)
 115                 return err;
 116
 117         /* fill in IO range for each cell; subdrivers handle the region */
 118         for (i = 0; i < ARRAY_SIZE(cs5535_mfd_cells); i++) {
 119                 int bar = cs5535_mfd_cells[i].id;
 120                 struct resource *r = &cs5535_mfd_resources[bar];
 121
 122                 r->flags = IORESOURCE_IO;
 123                 r->start = pci_resource_start(pdev, bar);
 124                 r->end = pci_resource_end(pdev, bar);
 125
 126                 /* id is used for temporarily storing BAR; unset it now */
 127                 cs5535_mfd_cells[i].id = 0;
 128         }
 129
 130         err = mfd_add_devices(&pdev->dev, -1, cs5535_mfd_cells,
 131                               ARRAY_SIZE(cs5535_mfd_cells), NULL, 0, NULL);
 132         if (err) {
 133                 dev_err(&pdev->dev, "MFD add devices failed: %d\n", err);
 134                 goto err_disable;
 135         }
 136
 137         if (machine_is_olpc())
 138                 mfd_clone_cell("cs5535-acpi", olpc_acpi_clones, ARRAY_SIZE(olpc_acpi_clones));
 139
 140         dev_info(&pdev->dev, "%zu devices registered.\n",
 141                         ARRAY_SIZE(cs5535_mfd_cells));
 142
 143         return 0;
 144
 145 err_disable:
 146         pci_disable_device(pdev);
 147         return err;
 148 }
 149
 150 static void cs5535_mfd_remove(struct pci_dev *pdev)
 151 {
 152         mfd_remove_devices(&pdev->dev);
 153         pci_disable_device(pdev);
 154 }
 155
 156 static const struct pci_device_id cs5535_mfd_pci_tbl[] = {
 157         { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA) },
 158         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) },
 159         { 0, }
 160 };
 161 MODULE_DEVICE_TABLE(pci, cs5535_mfd_pci_tbl);
 162
 163 static struct pci_driver cs5535_mfd_driver = {
 164         .name = DRV_NAME,
 165         .id_table = cs5535_mfd_pci_tbl,
 166         .probe = cs5535_mfd_probe,
 167         .remove = cs5535_mfd_remove,
 168 };
 169
 170 module_pci_driver(cs5535_mfd_driver);
 171
 172 MODULE_AUTHOR("Andres Salomon <dilinger@queued.net>");
 173 MODULE_DESCRIPTION("MFD driver for CS5535/CS5536 southbridge's ISA PCI device");
 174 MODULE_LICENSE("GPL");