drivers/serial/8250_acpi.c

   1 /*
   2  * Copyright (c) 2002-2003 Matthew Wilcox for Hewlett-Packard
   3  * Copyright (C) 2004 Hewlett-Packard Co
   4  *      Bjorn Helgaas <bjorn.helgaas@hp.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  */
  11
  12 #include <linux/acpi.h>
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/tty.h>
  16 #include <linux/serial.h>
  17 #include <linux/serial_core.h>
  18
  19 #include <acpi/acpi_bus.h>
  20
  21 #include <asm/io.h>
  22 #include <asm/serial.h>
  23
  24 struct serial_private {
  25         int     line;
  26         void    *iomem_base;
  27 };
  28
  29 static acpi_status acpi_serial_mmio(struct serial_struct *req,
  30                                     struct acpi_resource_address64 *addr)
  31 {
  32         unsigned long size;
  33
  34         size = addr->max_address_range - addr->min_address_range + 1;
  35         req->iomap_base = addr->min_address_range;
  36         req->iomem_base = ioremap(req->iomap_base, size);
  37         if (!req->iomem_base) {
  38                 printk(KERN_ERR "%s: couldn't ioremap 0x%lx-0x%lx\n",
  39                         __FUNCTION__, req->iomap_base, req->iomap_base + size);
  40                 return AE_ERROR;
  41         }
  42         req->io_type = SERIAL_IO_MEM;
  43         return AE_OK;
  44 }
  45
  46 static acpi_status acpi_serial_port(struct serial_struct *req,
  47                                     struct acpi_resource_io *io)
  48 {
  49         if (io->range_length) {
  50                 req->port = io->min_base_address;
  51                 req->io_type = SERIAL_IO_PORT;
  52         } else
  53                 printk(KERN_ERR "%s: zero-length IO port range?\n", __FUNCTION__);
  54         return AE_OK;
  55 }
  56
  57 static acpi_status acpi_serial_ext_irq(struct serial_struct *req,
  58                                        struct acpi_resource_ext_irq *ext_irq)
  59 {
  60         if (ext_irq->number_of_interrupts > 0)
  61                 req->irq = acpi_register_gsi(ext_irq->interrupts[0],
  62                           ext_irq->edge_level, ext_irq->active_high_low);
  63         return AE_OK;
  64 }
  65
  66 static acpi_status acpi_serial_irq(struct serial_struct *req,
  67                                    struct acpi_resource_irq *irq)
  68 {
  69         if (irq->number_of_interrupts > 0)
  70                 req->irq = acpi_register_gsi(irq->interrupts[0],
  71                           irq->edge_level, irq->active_high_low);
  72         return AE_OK;
  73 }
  74
  75 static acpi_status acpi_serial_resource(struct acpi_resource *res, void *data)
  76 {
  77         struct serial_struct *serial_req = (struct serial_struct *) data;
  78         struct acpi_resource_address64 addr;
  79         acpi_status status;
  80
  81         status = acpi_resource_to_address64(res, &addr);
  82         if (ACPI_SUCCESS(status))
  83                 return acpi_serial_mmio(serial_req, &addr);
  84         else if (res->id == ACPI_RSTYPE_IO)
  85                 return acpi_serial_port(serial_req, &res->data.io);
  86         else if (res->id == ACPI_RSTYPE_EXT_IRQ)
  87                 return acpi_serial_ext_irq(serial_req, &res->data.extended_irq);
  88         else if (res->id == ACPI_RSTYPE_IRQ)
  89                 return acpi_serial_irq(serial_req, &res->data.irq);
  90         return AE_OK;
  91 }
  92
  93 static int acpi_serial_add(struct acpi_device *device)
  94 {
  95         struct serial_private *priv;
  96         acpi_status status;
  97         struct serial_struct serial_req;
  98         int result;
  99
 100         memset(&serial_req, 0, sizeof(serial_req));
 101
 102         priv = kmalloc(sizeof(struct serial_private), GFP_KERNEL);
 103         if (!priv) {
 104                 result = -ENOMEM;
 105                 goto fail;
 106         }
 107         memset(priv, 0, sizeof(*priv));
 108
 109         status = acpi_walk_resources(device->handle, METHOD_NAME__CRS,
 110                                      acpi_serial_resource, &serial_req);
 111         if (ACPI_FAILURE(status)) {
 112                 result = -ENODEV;
 113                 goto fail;
 114         }
 115
 116         if (serial_req.iomem_base)
 117                 priv->iomem_base = serial_req.iomem_base;
 118         else if (!serial_req.port) {
 119                 printk(KERN_ERR "%s: no iomem or port address in %s _CRS\n",
 120                         __FUNCTION__, device->pnp.bus_id);
 121                 result = -ENODEV;
 122                 goto fail;
 123         }
 124
 125         serial_req.baud_base = BASE_BAUD;
 126         serial_req.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;
 127
 128         priv->line = register_serial(&serial_req);
 129         if (priv->line < 0) {
 130                 printk(KERN_WARNING "Couldn't register serial port %s: %d\n",
 131                         device->pnp.bus_id, priv->line);
 132                 result = -ENODEV;
 133                 goto fail;
 134         }
 135
 136         acpi_driver_data(device) = priv;
 137         return 0;
 138
 139 fail:
 140         if (serial_req.iomem_base)
 141                 iounmap(serial_req.iomem_base);
 142         kfree(priv);
 143
 144         return result;
 145 }
 146
 147 static int acpi_serial_remove(struct acpi_device *device, int type)
 148 {
 149         struct serial_private *priv;
 150
 151         if (!device || !acpi_driver_data(device))
 152                 return -EINVAL;
 153
 154         priv = acpi_driver_data(device);
 155         unregister_serial(priv->line);
 156         if (priv->iomem_base)
 157                 iounmap(priv->iomem_base);
 158         kfree(priv);
 159
 160         return 0;
 161 }
 162
 163 static struct acpi_driver acpi_serial_driver = {
 164         .name =         "serial",
 165         .class =        "",
 166         .ids =          "PNP0501",
 167         .ops =  {
 168                 .add =          acpi_serial_add,
 169                 .remove =       acpi_serial_remove,
 170         },
 171 };
 172
 173 static int __init acpi_serial_init(void)
 174 {
 175         return acpi_bus_register_driver(&acpi_serial_driver);
 176 }
 177
 178 static void __exit acpi_serial_exit(void)
 179 {
 180         acpi_bus_unregister_driver(&acpi_serial_driver);
 181 }
 182
 183 module_init(acpi_serial_init);
 184 module_exit(acpi_serial_exit);
 185
 186 MODULE_LICENSE("GPL");
 187 MODULE_DESCRIPTION("Generic 8250/16x50 ACPI serial driver");