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scc_sio.c

/*
 * setup serial port in SCC
 *
 * (C) Copyright 2006-2007 TOSHIBA CORPORATION
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <linux/tty.h>
#include <linux/serial.h>
#include <linux/serial_core.h>
#include <linux/console.h>

#include <asm/io.h>
#include <asm/prom.h>

/* sio irq0=0xb00010022 irq0=0xb00010023 irq2=0xb00010024
    mmio=0xfff000-0x1000,0xff2000-0x1000 */
static int txx9_serial_bitmap __initdata = 0;

static struct {
      uint32_t offset;
      uint32_t index;
} txx9_scc_tab[3] __initdata = {
      { 0x300, 0 },     /* 0xFFF300 */
      { 0x400, 0 },     /* 0xFFF400 */
      { 0x800, 1 }      /* 0xFF2800 */
};

static int __init txx9_serial_init(void)
{
      extern int early_serial_txx9_setup(struct uart_port *port);
      struct device_node *node = NULL;
      int i;
      struct uart_port req;
      struct of_irq irq;
      struct resource res;

      while ((node = of_find_compatible_node(node,
                        "serial", "toshiba,sio-scc")) != NULL) {
            for (i = 0; i < ARRAY_SIZE(txx9_scc_tab); i++) {
                  if (!(txx9_serial_bitmap & (1<<i)))
                        continue;

                  if (of_irq_map_one(node, i, &irq))
                        continue;
                  if (of_address_to_resource(node,
                        txx9_scc_tab[i].index, &res))
                        continue;

                  memset(&req, 0, sizeof(req));
                  req.line = i;
                  req.iotype = UPIO_MEM;
                  req.mapbase = res.start + txx9_scc_tab[i].offset;
#ifdef CONFIG_SERIAL_TXX9_CONSOLE
                  req.membase = ioremap(req.mapbase, 0x24);
#endif
                  req.irq = irq_create_of_mapping(irq.controller,
                        irq.specifier, irq.size);
                  req.flags |= UPF_IOREMAP | UPF_BUGGY_UART
                        /*HAVE_CTS_LINE*/;
                  req.uartclk = 83300000;
                  early_serial_txx9_setup(&req);
            }
      }

      return 0;
}

static int __init txx9_serial_config(char *ptr)
{
      int   i;

      for (;;) {
            switch(get_option(&ptr, &i)) {
            default:
                  return 0;
            case 2:
                  txx9_serial_bitmap |= 1 << i;
                  break;
            case 1:
                  txx9_serial_bitmap |= 1 << i;
                  return 0;
            }
      }
}
__setup("txx9_serial=", txx9_serial_config);

console_initcall(txx9_serial_init);

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