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 #ifdef CONFIG_IA64
  62                 req->irq = acpi_register_irq(ext_irq->interrupts[0],
  63                           ext_irq->active_high_low, ext_irq->edge_level);
  64 #else
  65                 req->irq = ext_irq->interrupts[0];
  66 #endif
  67         }
  68         return AE_OK;
  69 }
  70
  71 static acpi_status acpi_serial_irq(struct serial_struct *req,
  72                                    struct acpi_resource_irq *irq)
  73 {
  74         if (irq->number_of_interrupts > 0) {
  75 #ifdef CONFIG_IA64
  76                 req->irq = acpi_register_irq(irq->interrupts[0],
  77                           irq->active_high_low, irq->edge_level);
  78 #else
  79                 req->irq = irq->interrupts[0];
  80 #endif
  81         }
  82         return AE_OK;
  83 }
  84
  85 static acpi_status acpi_serial_resource(struct acpi_resource *res, void *data)
  86 {
  87         struct serial_struct *serial_req = (struct serial_struct *) data;
  88         struct acpi_resource_address64 addr;
  89         acpi_status status;
  90
  91         status = acpi_resource_to_address64(res, &addr);
  92         if (ACPI_SUCCESS(status))
  93                 return acpi_serial_mmio(serial_req, &addr);
  94         else if (res->id == ACPI_RSTYPE_IO)
  95                 return acpi_serial_port(serial_req, &res->data.io);
  96         else if (res->id == ACPI_RSTYPE_EXT_IRQ)
  97                 return acpi_serial_ext_irq(serial_req, &res->data.extended_irq);
  98         else if (res->id == ACPI_RSTYPE_IRQ)
  99                 return acpi_serial_irq(serial_req, &res->data.irq);
 100         return AE_OK;
 101 }
 102
 103 static int acpi_serial_add(struct acpi_device *device)
 104 {
 105         struct serial_private *priv;
 106         acpi_status status;
 107         struct serial_struct serial_req;
 108         int result;
 109
 110         memset(&serial_req, 0, sizeof(serial_req));
 111
 112         priv = kmalloc(sizeof(struct serial_private), GFP_KERNEL);
 113         if (!priv) {
 114                 result = -ENOMEM;
 115                 goto fail;
 116         }
 117         memset(priv, 0, sizeof(*priv));
 118
 119         status = acpi_walk_resources(device->handle, METHOD_NAME__CRS,
 120                                      acpi_serial_resource, &serial_req);
 121         if (ACPI_FAILURE(status)) {
 122                 result = -ENODEV;
 123                 goto fail;
 124         }
 125
 126         if (serial_req.iomem_base)
 127                 priv->iomem_base = serial_req.iomem_base;
 128         else if (!serial_req.port) {
 129                 printk(KERN_ERR "%s: no iomem or port address in %s _CRS\n",
 130                         __FUNCTION__, device->pnp.bus_id);
 131                 result = -ENODEV;
 132                 goto fail;
 133         }
 134
 135         serial_req.baud_base = BASE_BAUD;
 136         serial_req.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF | UPF_RESOURCES;
 137
 138         priv->line = register_serial(&serial_req);
 139         if (priv->line < 0) {
 140                 printk(KERN_WARNING "Couldn't register serial port %s: %d\n",
 141                         device->pnp.bus_id, priv->line);
 142                 result = -ENODEV;
 143                 goto fail;
 144         }
 145
 146         acpi_driver_data(device) = priv;
 147         return 0;
 148
 149 fail:
 150         if (serial_req.iomem_base)
 151                 iounmap(serial_req.iomem_base);
 152         kfree(priv);
 153
 154         return result;
 155 }
 156
 157 static int acpi_serial_remove(struct acpi_device *device, int type)
 158 {
 159         struct serial_private *priv;
 160
 161         if (!device || !acpi_driver_data(device))
 162                 return -EINVAL;
 163
 164         priv = acpi_driver_data(device);
 165         unregister_serial(priv->line);
 166         if (priv->iomem_base)
 167                 iounmap(priv->iomem_base);
 168         kfree(priv);
 169
 170         return 0;
 171 }
 172
 173 static struct acpi_driver acpi_serial_driver = {
 174         .name =         "serial",
 175         .class =        "",
 176         .ids =          "PNP0501",
 177         .ops =  {
 178                 .add =          acpi_serial_add,
 179                 .remove =       acpi_serial_remove,
 180         },
 181 };
 182
 183 static int __init acpi_serial_init(void)
 184 {
 185         return acpi_bus_register_driver(&acpi_serial_driver);
 186 }
 187
 188 static void __exit acpi_serial_exit(void)
 189 {
 190         acpi_bus_unregister_driver(&acpi_serial_driver);
 191 }
 192
 193 module_init(acpi_serial_init);
 194 module_exit(acpi_serial_exit);
 195
 196 MODULE_LICENSE("GPL");
 197 MODULE_DESCRIPTION("Generic 8250/16x50 ACPI serial driver");