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         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
  64         if (!res) {
  65                 dev_err(&pdev->dev, "can't fetch device resource info\n");
  66                 return -EIO;
  67         }
  68
  69         release_region(res->start, resource_size(res));
  70         return 0;
  71 }
  72
  73 static struct resource cs5535_mfd_resources[NR_BARS];
  74
  75 static struct mfd_cell cs5535_mfd_cells[] = {
  76         {
  77                 .id = SMB_BAR,
  78                 .name = "cs5535-smb",
  79                 .num_resources = 1,
  80                 .resources = &cs5535_mfd_resources[SMB_BAR],
  81         },
  82         {
  83                 .id = GPIO_BAR,
  84                 .name = "cs5535-gpio",
  85                 .num_resources = 1,
  86                 .resources = &cs5535_mfd_resources[GPIO_BAR],
  87         },
  88         {
  89                 .id = MFGPT_BAR,
  90                 .name = "cs5535-mfgpt",
  91                 .num_resources = 1,
  92                 .resources = &cs5535_mfd_resources[MFGPT_BAR],
  93         },
  94         {
  95                 .id = PMS_BAR,
  96                 .name = "cs5535-pms",
  97                 .num_resources = 1,
  98                 .resources = &cs5535_mfd_resources[PMS_BAR],
  99
 100                 .enable = cs5535_mfd_res_enable,
 101                 .disable = cs5535_mfd_res_disable,
 102         },
 103         {
 104                 .id = ACPI_BAR,
 105                 .name = "cs5535-acpi",
 106                 .num_resources = 1,
 107                 .resources = &cs5535_mfd_resources[ACPI_BAR],
 108
 109                 .enable = cs5535_mfd_res_enable,
 110                 .disable = cs5535_mfd_res_disable,
 111         },
 112 };
 113
 114 #ifdef CONFIG_OLPC
 115 static void cs5535_clone_olpc_cells(void)
 116 {
 117         const char *acpi_clones[] = { "olpc-xo1-pm-acpi", "olpc-xo1-sci-acpi" };
 118
 119         if (!machine_is_olpc())
 120                 return;
 121
 122         mfd_clone_cell("cs5535-acpi", acpi_clones, ARRAY_SIZE(acpi_clones));
 123 }
 124 #else
 125 static void cs5535_clone_olpc_cells(void) { }
 126 #endif
 127
 128 static int cs5535_mfd_probe(struct pci_dev *pdev,
 129                 const struct pci_device_id *id)
 130 {
 131         int err, i;
 132
 133         err = pci_enable_device(pdev);
 134         if (err)
 135                 return err;
 136
 137         /* fill in IO range for each cell; subdrivers handle the region */
 138         for (i = 0; i < ARRAY_SIZE(cs5535_mfd_cells); i++) {
 139                 int bar = cs5535_mfd_cells[i].id;
 140                 struct resource *r = &cs5535_mfd_resources[bar];
 141
 142                 r->flags = IORESOURCE_IO;
 143                 r->start = pci_resource_start(pdev, bar);
 144                 r->end = pci_resource_end(pdev, bar);
 145
 146                 /* id is used for temporarily storing BAR; unset it now */
 147                 cs5535_mfd_cells[i].id = 0;
 148         }
 149
 150         err = mfd_add_devices(&pdev->dev, -1, cs5535_mfd_cells,
 151                               ARRAY_SIZE(cs5535_mfd_cells), NULL, 0, NULL);
 152         if (err) {
 153                 dev_err(&pdev->dev, "MFD add devices failed: %d\n", err);
 154                 goto err_disable;
 155         }
 156         cs5535_clone_olpc_cells();
 157
 158         dev_info(&pdev->dev, "%zu devices registered.\n",
 159                         ARRAY_SIZE(cs5535_mfd_cells));
 160
 161         return 0;
 162
 163 err_disable:
 164         pci_disable_device(pdev);
 165         return err;
 166 }
 167
 168 static void cs5535_mfd_remove(struct pci_dev *pdev)
 169 {
 170         mfd_remove_devices(&pdev->dev);
 171         pci_disable_device(pdev);
 172 }
 173
 174 static const struct pci_device_id cs5535_mfd_pci_tbl[] = {
 175         { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA) },
 176         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) },
 177         { 0, }
 178 };
 179 MODULE_DEVICE_TABLE(pci, cs5535_mfd_pci_tbl);
 180
 181 static struct pci_driver cs5535_mfd_driver = {
 182         .name = DRV_NAME,
 183         .id_table = cs5535_mfd_pci_tbl,
 184         .probe = cs5535_mfd_probe,
 185         .remove = cs5535_mfd_remove,
 186 };
 187
 188 module_pci_driver(cs5535_mfd_driver);
 189
 190 MODULE_AUTHOR("Andres Salomon <dilinger@queued.net>");
 191 MODULE_DESCRIPTION("MFD driver for CS5535/CS5536 southbridge's ISA PCI device");
 192 MODULE_LICENSE("GPL");