arch/powerpc/platforms/celleb/scc_sio.c

   1 /*
   2  * setup serial port in SCC
   3  *
   4  * (C) Copyright 2006-2007 TOSHIBA CORPORATION
   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  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20
  21 #include <linux/tty.h>
  22 #include <linux/serial.h>
  23 #include <linux/serial_core.h>
  24 #include <linux/console.h>
  25
  26 #include <asm/io.h>
  27 #include <asm/prom.h>
  28
  29 /* sio irq0=0xb00010022 irq0=0xb00010023 irq2=0xb00010024
  30     mmio=0xfff000-0x1000,0xff2000-0x1000 */
  31 static int txx9_serial_bitmap __initdata = 0;
  32
  33 static struct {
  34         uint32_t offset;
  35         uint32_t index;
  36 } txx9_scc_tab[3] __initdata = {
  37         { 0x300, 0 },   /* 0xFFF300 */
  38         { 0x400, 0 },   /* 0xFFF400 */
  39         { 0x800, 1 }    /* 0xFF2800 */
  40 };
  41
  42 static int __init txx9_serial_init(void)
  43 {
  44         extern int early_serial_txx9_setup(struct uart_port *port);
  45         struct device_node *node = NULL;
  46         int i;
  47         struct uart_port req;
  48         struct of_irq irq;
  49         struct resource res;
  50
  51         while ((node = of_find_compatible_node(node,
  52                                 "serial", "toshiba,sio-scc")) != NULL) {
  53                 for (i = 0; i < ARRAY_SIZE(txx9_scc_tab); i++) {
  54                         if (!(txx9_serial_bitmap & (1<<i)))
  55                                 continue;
  56
  57                         if (of_irq_map_one(node, i, &irq))
  58                                 continue;
  59                         if (of_address_to_resource(node,
  60                                 txx9_scc_tab[i].index, &res))
  61                                 continue;
  62
  63                         memset(&req, 0, sizeof(req));
  64                         req.line = i;
  65                         req.iotype = UPIO_MEM;
  66                         req.mapbase = res.start + txx9_scc_tab[i].offset;
  67 #ifdef CONFIG_SERIAL_TXX9_CONSOLE
  68                         req.membase = ioremap(req.mapbase, 0x24);
  69 #endif
  70                         req.irq = irq_create_of_mapping(irq.controller,
  71                                 irq.specifier, irq.size);
  72                         req.flags |= UPF_IOREMAP | UPF_BUGGY_UART
  73                                 /*HAVE_CTS_LINE*/;
  74                         req.uartclk = 83300000;
  75                         early_serial_txx9_setup(&req);
  76                 }
  77         }
  78
  79         return 0;
  80 }
  81
  82 static int __init txx9_serial_config(char *ptr)
  83 {
  84         int     i;
  85
  86         for (;;) {
  87                 switch(get_option(&ptr, &i)) {
  88                 default:
  89                         return 0;
  90                 case 2:
  91                         txx9_serial_bitmap |= 1 << i;
  92                         break;
  93                 case 1:
  94                         txx9_serial_bitmap |= 1 << i;
  95                         return 0;
  96                 }
  97         }
  98 }
  99 __setup("txx9_serial=", txx9_serial_config);
 100
 101 console_initcall(txx9_serial_init);