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 struct resource cs5535_mfd_resources[NR_BARS];
  31
  32 static struct mfd_cell cs5535_mfd_cells[] = {
  33         {
  34                 .name = "cs5535-smb",
  35                 .num_resources = 1,
  36                 .resources = &cs5535_mfd_resources[SMB_BAR],
  37         },
  38         {
  39                 .name = "cs5535-gpio",
  40                 .num_resources = 1,
  41                 .resources = &cs5535_mfd_resources[GPIO_BAR],
  42         },
  43         {
  44                 .name = "cs5535-mfgpt",
  45                 .num_resources = 1,
  46                 .resources = &cs5535_mfd_resources[MFGPT_BAR],
  47         },
  48         {
  49                 .name = "cs5535-pms",
  50                 .num_resources = 1,
  51                 .resources = &cs5535_mfd_resources[PMS_BAR],
  52         },
  53 };
  54
  55 static struct mfd_cell cs5535_olpc_mfd_cells[] = {
  56         {
  57                 .name = "olpc-xo1-pm-acpi",
  58                 .num_resources = 1,
  59                 .resources = &cs5535_mfd_resources[ACPI_BAR],
  60         },
  61         {
  62                 .name = "olpc-xo1-sci-acpi",
  63                 .num_resources = 1,
  64                 .resources = &cs5535_mfd_resources[ACPI_BAR],
  65         },
  66 };
  67
  68 static int cs5535_mfd_probe(struct pci_dev *pdev,
  69                 const struct pci_device_id *id)
  70 {
  71         int err, bar;
  72
  73         err = pci_enable_device(pdev);
  74         if (err)
  75                 return err;
  76
  77         for (bar = 0; bar < NR_BARS; bar++) {
  78                 struct resource *r = &cs5535_mfd_resources[bar];
  79
  80                 r->flags = IORESOURCE_IO;
  81                 r->start = pci_resource_start(pdev, bar);
  82                 r->end = pci_resource_end(pdev, bar);
  83         }
  84
  85         err = pci_request_region(pdev, PMS_BAR, DRV_NAME);
  86         if (err) {
  87                 dev_err(&pdev->dev, "Failed to request PMS_BAR's IO region\n");
  88                 goto err_disable;
  89         }
  90
  91         err = mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE, cs5535_mfd_cells,
  92                               ARRAY_SIZE(cs5535_mfd_cells), NULL, 0, NULL);
  93         if (err) {
  94                 dev_err(&pdev->dev,
  95                         "Failed to add CS5535 sub-devices: %d\n", err);
  96                 goto err_release_pms;
  97         }
  98
  99         if (machine_is_olpc()) {
 100                 err = pci_request_region(pdev, ACPI_BAR, DRV_NAME);
 101                 if (err) {
 102                         dev_err(&pdev->dev,
 103                                 "Failed to request ACPI_BAR's IO region\n");
 104                         goto err_remove_devices;
 105                 }
 106
 107                 err = mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
 108                                       cs5535_olpc_mfd_cells,
 109                                       ARRAY_SIZE(cs5535_olpc_mfd_cells),
 110                                       NULL, 0, NULL);
 111                 if (err) {
 112                         dev_err(&pdev->dev,
 113                                 "Failed to add CS5535 OLPC sub-devices: %d\n",
 114                                 err);
 115                         goto err_release_acpi;
 116                 }
 117         }
 118
 119         dev_info(&pdev->dev, "%zu devices registered.\n",
 120                         ARRAY_SIZE(cs5535_mfd_cells));
 121
 122         return 0;
 123
 124 err_release_acpi:
 125         pci_release_region(pdev, ACPI_BAR);
 126 err_remove_devices:
 127         mfd_remove_devices(&pdev->dev);
 128 err_release_pms:
 129         pci_release_region(pdev, PMS_BAR);
 130 err_disable:
 131         pci_disable_device(pdev);
 132         return err;
 133 }
 134
 135 static void cs5535_mfd_remove(struct pci_dev *pdev)
 136 {
 137         mfd_remove_devices(&pdev->dev);
 138
 139         if (machine_is_olpc())
 140                 pci_release_region(pdev, ACPI_BAR);
 141
 142         pci_release_region(pdev, PMS_BAR);
 143         pci_disable_device(pdev);
 144 }
 145
 146 static const struct pci_device_id cs5535_mfd_pci_tbl[] = {
 147         { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA) },
 148         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) },
 149         { 0, }
 150 };
 151 MODULE_DEVICE_TABLE(pci, cs5535_mfd_pci_tbl);
 152
 153 static struct pci_driver cs5535_mfd_driver = {
 154         .name = DRV_NAME,
 155         .id_table = cs5535_mfd_pci_tbl,
 156         .probe = cs5535_mfd_probe,
 157         .remove = cs5535_mfd_remove,
 158 };
 159
 160 module_pci_driver(cs5535_mfd_driver);
 161
 162 MODULE_AUTHOR("Andres Salomon <dilinger@queued.net>");
 163 MODULE_DESCRIPTION("MFD driver for CS5535/CS5536 southbridge's ISA PCI device");
 164 MODULE_LICENSE("GPL");