linux/drivers/mfd/cs5535-mfd.c
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   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/init.h>
  27#include <linux/mfd/core.h>
  28#include <linux/module.h>
  29#include <linux/pci.h>
  30#include <asm/olpc.h>
  31
  32#define DRV_NAME "cs5535-mfd"
  33
  34enum cs5535_mfd_bars {
  35        SMB_BAR = 0,
  36        GPIO_BAR = 1,
  37        MFGPT_BAR = 2,
  38        PMS_BAR = 4,
  39        ACPI_BAR = 5,
  40        NR_BARS,
  41};
  42
  43static int cs5535_mfd_res_enable(struct platform_device *pdev)
  44{
  45        struct resource *res;
  46
  47        res = platform_get_resource(pdev, IORESOURCE_IO, 0);
  48        if (!res) {
  49                dev_err(&pdev->dev, "can't fetch device resource info\n");
  50                return -EIO;
  51        }
  52
  53        if (!request_region(res->start, resource_size(res), DRV_NAME)) {
  54                dev_err(&pdev->dev, "can't request region\n");
  55                return -EIO;
  56        }
  57
  58        return 0;
  59}
  60
  61static int cs5535_mfd_res_disable(struct platform_device *pdev)
  62{
  63        struct resource *res;
  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
  74static struct resource cs5535_mfd_resources[NR_BARS];
  75
  76static 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
 116static void cs5535_clone_olpc_cells(void)
 117{
 118        const char *acpi_clones[] = { "olpc-xo1-pm-acpi", "olpc-xo1-sci-acpi" };
 119
 120        if (!machine_is_olpc())
 121                return;
 122
 123        mfd_clone_cell("cs5535-acpi", acpi_clones, ARRAY_SIZE(acpi_clones));
 124}
 125#else
 126static void cs5535_clone_olpc_cells(void) { }
 127#endif
 128
 129static int cs5535_mfd_probe(struct pci_dev *pdev,
 130                const struct pci_device_id *id)
 131{
 132        int err, i;
 133
 134        err = pci_enable_device(pdev);
 135        if (err)
 136                return err;
 137
 138        /* fill in IO range for each cell; subdrivers handle the region */
 139        for (i = 0; i < ARRAY_SIZE(cs5535_mfd_cells); i++) {
 140                int bar = cs5535_mfd_cells[i].id;
 141                struct resource *r = &cs5535_mfd_resources[bar];
 142
 143                r->flags = IORESOURCE_IO;
 144                r->start = pci_resource_start(pdev, bar);
 145                r->end = pci_resource_end(pdev, bar);
 146
 147                /* id is used for temporarily storing BAR; unset it now */
 148                cs5535_mfd_cells[i].id = 0;
 149        }
 150
 151        err = mfd_add_devices(&pdev->dev, -1, cs5535_mfd_cells,
 152                              ARRAY_SIZE(cs5535_mfd_cells), NULL, 0, NULL);
 153        if (err) {
 154                dev_err(&pdev->dev, "MFD add devices failed: %d\n", err);
 155                goto err_disable;
 156        }
 157        cs5535_clone_olpc_cells();
 158
 159        dev_info(&pdev->dev, "%zu devices registered.\n",
 160                        ARRAY_SIZE(cs5535_mfd_cells));
 161
 162        return 0;
 163
 164err_disable:
 165        pci_disable_device(pdev);
 166        return err;
 167}
 168
 169static void cs5535_mfd_remove(struct pci_dev *pdev)
 170{
 171        mfd_remove_devices(&pdev->dev);
 172        pci_disable_device(pdev);
 173}
 174
 175static DEFINE_PCI_DEVICE_TABLE(cs5535_mfd_pci_tbl) = {
 176        { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA) },
 177        { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) },
 178        { 0, }
 179};
 180MODULE_DEVICE_TABLE(pci, cs5535_mfd_pci_tbl);
 181
 182static struct pci_driver cs5535_mfd_driver = {
 183        .name = DRV_NAME,
 184        .id_table = cs5535_mfd_pci_tbl,
 185        .probe = cs5535_mfd_probe,
 186        .remove = cs5535_mfd_remove,
 187};
 188
 189module_pci_driver(cs5535_mfd_driver);
 190
 191MODULE_AUTHOR("Andres Salomon <dilinger@queued.net>");
 192MODULE_DESCRIPTION("MFD driver for CS5535/CS5536 southbridge's ISA PCI device");
 193MODULE_LICENSE("GPL");
 194
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