LXR linux/arch/mips/pmc-sierra/msp71xx/msp

   1/*
   2 * The setup file for serial related hardware on PMC-Sierra MSP processors.
   3 *
   4 * Copyright 2005 PMC-Sierra, Inc.
   5 *
   6 *  This program is free software; you can redistribute  it and/or modify it
   7 *  under  the terms of  the GNU General  Public License as published by the
   8 *  Free Software Foundation;  either version 2 of the  License, or (at your
   9 *  option) any later version.
  10 *
  11 *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  12 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  13 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  14 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  15 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  16 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  17 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  18 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  19 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  20 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  21 *
  22 *  You should have received a copy of the  GNU General Public License along
  23 *  with this program; if not, write  to the Free Software Foundation, Inc.,
  24 *  675 Mass Ave, Cambridge, MA 02139, USA.
  25 */
  26
  27#include <linux/serial.h>
  28#include <linux/serial_core.h>
  29#include <linux/serial_reg.h>
  30
  31#include <asm/bootinfo.h>
  32#include <asm/io.h>
  33#include <asm/processor.h>
  34#include <asm/serial.h>
  35#include <linux/serial_8250.h>
  36
  37#include <msp_prom.h>
  38#include <msp_int.h>
  39#include <msp_regs.h>
  40
  41void __init msp_serial_setup(void)
  42{
  43        char    *s;
  44        char    *endp;
  45        struct uart_port up;
  46        unsigned int uartclk;
  47
  48        memset(&up, 0, sizeof(up));
  49
  50        /* Check if clock was specified in environment */
  51        s = prom_getenv("uartfreqhz");
  52        if(!(s && *s && (uartclk = simple_strtoul(s, &endp, 10)) && *endp == 0))
  53                uartclk = MSP_BASE_BAUD;
  54        ppfinit("UART clock set to %d\n", uartclk);
  55
  56        /* Initialize first serial port */
  57        up.mapbase      = MSP_UART0_BASE;
  58        up.membase      = ioremap_nocache(up.mapbase, MSP_UART_REG_LEN);
  59        up.irq          = MSP_INT_UART0;
  60        up.uartclk      = uartclk;
  61        up.regshift     = 2;
  62        up.iotype       = UPIO_DWAPB; /* UPIO_MEM like */
  63        up.flags        = ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST;
  64        up.type         = PORT_16550A;
  65        up.line         = 0;
  66        up.private_data         = (void*)UART0_STATUS_REG;
  67        if (early_serial_setup(&up))
  68                printk(KERN_ERR "Early serial init of port 0 failed\n");
  69
  70        /* Initialize the second serial port, if one exists */
  71        switch (mips_machtype) {
  72                case MACH_MSP4200_EVAL:
  73                case MACH_MSP4200_GW:
  74                case MACH_MSP4200_FPGA:
  75                case MACH_MSP7120_EVAL:
  76                case MACH_MSP7120_GW:
  77                case MACH_MSP7120_FPGA:
  78                        /* Enable UART1 on MSP4200 and MSP7120 */
  79                        *GPIO_CFG2_REG = 0x00002299;
  80                        break;
  81
  82                default:
  83                        return; /* No second serial port, good-bye. */
  84        }
  85
  86        up.mapbase      = MSP_UART1_BASE;
  87        up.membase      = ioremap_nocache(up.mapbase, MSP_UART_REG_LEN);
  88        up.irq          = MSP_INT_UART1;
  89        up.line         = 1;
  90        up.private_data         = (void*)UART1_STATUS_REG;
  91        if (early_serial_setup(&up))
  92                printk(KERN_ERR "Early serial init of port 1 failed\n");
  93}
  94