arch/mips/pmc-sierra/msp71xx/msp_serial.c

   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
  41 void __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 }