LXR linux/arch/powerpc/platforms/cell/celleb_scc

   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 */
  31static int txx9_serial_bitmap __initdata;
  32
  33static 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
  42static 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
  82static 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
 101console_initcall(txx9_serial_init);
 102