drivers/mfd/cs5535-mfd.c

   1 /*
   2  * cs5535-mfd.c - core MFD driver for CS5535/CS5536 southbridges
   3  *
   4  * The CS5535 and CS5536 has an ISA bridge on the PCI bus that is
   5  * used for accessing GPIOs, MFGPTs, ACPI, etc.  Each subdevice has
   6  * an IO range that's specified in a single BAR.  The BAR order is
   7  * hardcoded in the CS553x specifications.
   8  *
   9  * Copyright (c) 2010  Andres Salomon <dilinger@queued.net>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/mfd/core.h>
  27 #include <linux/module.h>
  28 #include <linux/pci.h>
  29 #include <asm/olpc.h>
  30
  31 #define DRV_NAME "cs5535-mfd"
  32
  33 enum cs5535_mfd_bars {
  34         SMB_BAR = 0,
  35         GPIO_BAR = 1,
  36         MFGPT_BAR = 2,
  37         PMS_BAR = 4,
  38         ACPI_BAR = 5,
  39         NR_BARS,
  40 };
  41
  42 static int cs5535_mfd_res_enable(struct platform_device *pdev)
  43 {
  44         struct resource *res;
  45
  46         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
  47         if (!res) {
  48                 dev_err(&pdev->dev, "can't fetch device resource info\n");
  49                 return -EIO;
  50         }
  51
  52         if (!request_region(res->start, resource_size(res), DRV_NAME)) {
  53                 dev_err(&pdev->dev, "can't request region\n");
  54                 return -EIO;
  55         }
  56
  57         return 0;
  58 }
  59
  60 static int cs5535_mfd_res_disable(struct platform_device *pdev)
  61 {
  62         struct resource *res;
  63
  64         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
  65         if (!res) {
  66                 dev_err(&pdev->dev, "can't fetch device resource info\n");
  67                 return -EIO;
  68         }
  69
  70         release_region(res->start, resource_size(res));
  71         return 0;
  72 }
  73
  74 static struct resource cs5535_mfd_resources[NR_BARS];
  75
  76 static struct mfd_cell cs5535_mfd_cells[] = {
  77         {
  78                 .id = SMB_BAR,
  79                 .name = "cs5535-smb",
  80                 .num_resources = 1,
  81                 .resources = &cs5535_mfd_resources[SMB_BAR],
  82         },
  83         {
  84                 .id = GPIO_BAR,
  85                 .name = "cs5535-gpio",
  86                 .num_resources = 1,
  87                 .resources = &cs5535_mfd_resources[GPIO_BAR],
  88         },
  89         {
  90                 .id = MFGPT_BAR,
  91                 .name = "cs5535-mfgpt",
  92                 .num_resources = 1,
  93                 .resources = &cs5535_mfd_resources[MFGPT_BAR],
  94         },
  95         {
  96                 .id = PMS_BAR,
  97                 .name = "cs5535-pms",
  98                 .num_resources = 1,
  99                 .resources = &cs5535_mfd_resources[PMS_BAR],
 100
 101                 .enable = cs5535_mfd_res_enable,
 102                 .disable = cs5535_mfd_res_disable,
 103         },
 104         {
 105                 .id = ACPI_BAR,
 106                 .name = "cs5535-acpi",
 107                 .num_resources = 1,
 108                 .resources = &cs5535_mfd_resources[ACPI_BAR],
 109
 110                 .enable = cs5535_mfd_res_enable,
 111                 .disable = cs5535_mfd_res_disable,
 112         },
 113 };
 114
 115 #ifdef CONFIG_OLPC
 116 static void cs5535_clone_olpc_cells(void)
 117 {
 118         static const char *acpi_clones[] = {
 119                 "olpc-xo1-pm-acpi",
 120                 "olpc-xo1-sci-acpi"
 121         };
 122
 123         if (!machine_is_olpc())
 124                 return;
 125
 126         mfd_clone_cell("cs5535-acpi", acpi_clones, ARRAY_SIZE(acpi_clones));
 127 }
 128 #else
 129 static void cs5535_clone_olpc_cells(void) { }
 130 #endif
 131
 132 static int cs5535_mfd_probe(struct pci_dev *pdev,
 133                 const struct pci_device_id *id)
 134 {
 135         int err, i;
 136
 137         err = pci_enable_device(pdev);
 138         if (err)
 139                 return err;
 140
 141         /* fill in IO range for each cell; subdrivers handle the region */
 142         for (i = 0; i < ARRAY_SIZE(cs5535_mfd_cells); i++) {
 143                 int bar = cs5535_mfd_cells[i].id;
 144                 struct resource *r = &cs5535_mfd_resources[bar];
 145
 146                 r->flags = IORESOURCE_IO;
 147                 r->start = pci_resource_start(pdev, bar);
 148                 r->end = pci_resource_end(pdev, bar);
 149
 150                 /* id is used for temporarily storing BAR; unset it now */
 151                 cs5535_mfd_cells[i].id = 0;
 152         }
 153
 154         err = mfd_add_devices(&pdev->dev, -1, cs5535_mfd_cells,
 155                               ARRAY_SIZE(cs5535_mfd_cells), NULL, 0, NULL);
 156         if (err) {
 157                 dev_err(&pdev->dev, "MFD add devices failed: %d\n", err);
 158                 goto err_disable;
 159         }
 160         cs5535_clone_olpc_cells();
 161
 162         dev_info(&pdev->dev, "%zu devices registered.\n",
 163                         ARRAY_SIZE(cs5535_mfd_cells));
 164
 165         return 0;
 166
 167 err_disable:
 168         pci_disable_device(pdev);
 169         return err;
 170 }
 171
 172 static void cs5535_mfd_remove(struct pci_dev *pdev)
 173 {
 174         mfd_remove_devices(&pdev->dev);
 175         pci_disable_device(pdev);
 176 }
 177
 178 static const struct pci_device_id cs5535_mfd_pci_tbl[] = {
 179         { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA) },
 180         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) },
 181         { 0, }
 182 };
 183 MODULE_DEVICE_TABLE(pci, cs5535_mfd_pci_tbl);
 184
 185 static struct pci_driver cs5535_mfd_driver = {
 186         .name = DRV_NAME,
 187         .id_table = cs5535_mfd_pci_tbl,
 188         .probe = cs5535_mfd_probe,
 189         .remove = cs5535_mfd_remove,
 190 };
 191
 192 module_pci_driver(cs5535_mfd_driver);
 193
 194 MODULE_AUTHOR("Andres Salomon <dilinger@queued.net>");
 195 MODULE_DESCRIPTION("MFD driver for CS5535/CS5536 southbridge's ISA PCI device");
 196 MODULE_LICENSE("GPL");