drivers/serial/8250_acorn.c

   1 /*
   2  *  linux/drivers/serial/acorn.c
   3  *
   4  *  Copyright (C) 1996-2003 Russell King.
   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 version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <linux/module.h>
  11 #include <linux/types.h>
  12 #include <linux/tty.h>
  13 #include <linux/serial_core.h>
  14 #include <linux/serial.h>
  15 #include <linux/errno.h>
  16 #include <linux/ioport.h>
  17 #include <linux/slab.h>
  18 #include <linux/device.h>
  19 #include <linux/init.h>
  20
  21 #include <asm/io.h>
  22 #include <asm/ecard.h>
  23 #include <asm/string.h>
  24
  25 #define MAX_PORTS       3
  26
  27 struct serial_card_type {
  28         unsigned int    num_ports;
  29         unsigned int    baud_base;
  30         unsigned int    type;
  31         unsigned int    offset[MAX_PORTS];
  32 };
  33
  34 struct serial_card_info {
  35         unsigned int    num_ports;
  36         int             ports[MAX_PORTS];
  37 };
  38
  39 static inline int
  40 serial_register_onedev(unsigned long baddr, void *vaddr, int irq, unsigned int baud_base)
  41 {
  42         struct serial_struct req;
  43
  44         memset(&req, 0, sizeof(req));
  45         req.irq                 = irq;
  46         req.flags               = UPF_AUTOPROBE | UPF_RESOURCES |
  47                                   UPF_SHARE_IRQ;
  48         req.baud_base           = baud_base;
  49         req.io_type             = UPIO_MEM;
  50         req.iomem_base          = vaddr;
  51         req.iomem_reg_shift     = 2;
  52         req.iomap_base          = baddr;
  53
  54         return register_serial(&req);
  55 }
  56
  57 static int __devinit
  58 serial_card_probe(struct expansion_card *ec, const struct ecard_id *id)
  59 {
  60         struct serial_card_info *info;
  61         struct serial_card_type *type = id->data;
  62         unsigned long bus_addr;
  63         unsigned char *virt_addr;
  64         unsigned int port;
  65
  66         info = kmalloc(sizeof(struct serial_card_info), GFP_KERNEL);
  67         if (!info)
  68                 return -ENOMEM;
  69
  70         memset(info, 0, sizeof(struct serial_card_info));
  71         info->num_ports = type->num_ports;
  72
  73         ecard_set_drvdata(ec, info);
  74
  75         bus_addr = ec->resource[type->type].start;
  76         virt_addr = ioremap(bus_addr, ec->resource[type->type].end - bus_addr + 1);
  77         if (!virt_addr) {
  78                 kfree(info);
  79                 return -ENOMEM;
  80         }
  81
  82         for (port = 0; port < info->num_ports; port ++) {
  83                 unsigned long baddr = bus_addr + type->offset[port];
  84                 unsigned char *vaddr = virt_addr + type->offset[port];
  85
  86                 info->ports[port] = serial_register_onedev(baddr, vaddr,
  87                                                 ec->irq, type->baud_base);
  88         }
  89
  90         return 0;
  91 }
  92
  93 static void __devexit serial_card_remove(struct expansion_card *ec)
  94 {
  95         struct serial_card_info *info = ecard_get_drvdata(ec);
  96         int i;
  97
  98         ecard_set_drvdata(ec, NULL);
  99
 100         for (i = 0; i < info->num_ports; i++)
 101                 if (info->ports[i] > 0)
 102                         unregister_serial(info->ports[i]);
 103
 104         kfree(info);
 105 }
 106
 107 static struct serial_card_type atomwide_type = {
 108         .num_ports      = 3,
 109         .baud_base      = 7372800 / 16,
 110         .type           = ECARD_RES_IOCSLOW,
 111         .offset         = { 0x2800, 0x2400, 0x2000 },
 112 };
 113
 114 static struct serial_card_type serport_type = {
 115         .num_ports      = 2,
 116         .baud_base      = 3686400 / 16,
 117         .type           = ECARD_RES_IOCSLOW,
 118         .offset         = { 0x2000, 0x2020 },
 119 };
 120
 121 static const struct ecard_id serial_cids[] = {
 122         { MANU_ATOMWIDE,        PROD_ATOMWIDE_3PSERIAL, &atomwide_type  },
 123         { MANU_SERPORT,         PROD_SERPORT_DSPORT,    &serport_type   },
 124         { 0xffff, 0xffff }
 125 };
 126
 127 static struct ecard_driver serial_card_driver = {
 128         .probe          = serial_card_probe,
 129         .remove         = __devexit_p(serial_card_remove),
 130         .id_table       = serial_cids,
 131         .drv = {
 132                 .name           = "8250_acorn",
 133         },
 134 };
 135
 136 static int __init serial_card_init(void)
 137 {
 138         return ecard_register_driver(&serial_card_driver);
 139 }
 140
 141 static void __exit serial_card_exit(void)
 142 {
 143         ecard_remove_driver(&serial_card_driver);
 144 }
 145
 146 MODULE_AUTHOR("Russell King");
 147 MODULE_DESCRIPTION("Acorn 8250-compatible serial port expansion card driver");
 148 MODULE_LICENSE("GPL");
 149
 150 module_init(serial_card_init);
 151 module_exit(serial_card_exit);