msp_serial.c
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/*
* The setup file for serial related hardware on PMC-Sierra MSP processors.
*
* Copyright 2005 PMC-Sierra, Inc.
*
* 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* 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.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/serial.h>
#include <linux/serial_core.h>
#include <linux/serial_reg.h>
#include <asm/bootinfo.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/serial.h>
#include <linux/serial_8250.h>
#include <msp_prom.h>
#include <msp_int.h>
#include <msp_regs.h>
#ifdef CONFIG_KGDB
/*
* kgdb uses serial port 1 so the console can remain on port 0.
* To use port 0 change the definition to read as follows:
* #define DEBUG_PORT_BASE KSEG1ADDR(MSP_UART0_BASE)
*/
#define DEBUG_PORT_BASE KSEG1ADDR(MSP_UART1_BASE)
int putDebugChar(char c)
{
volatile uint32_t *uart = (volatile uint32_t *)DEBUG_PORT_BASE;
uint32_t val = (uint32_t)c;
local_irq_disable();
while( !(uart[5] & 0x20) ); /* Wait for TXRDY */
uart[0] = val;
while( !(uart[5] & 0x20) ); /* Wait for TXRDY */
local_irq_enable();
return 1;
}
char getDebugChar(void)
{
volatile uint32_t *uart = (volatile uint32_t *)DEBUG_PORT_BASE;
uint32_t val;
while( !(uart[5] & 0x01) ); /* Wait for RXRDY */
val = uart[0];
return (char)val;
}
void initDebugPort(unsigned int uartclk, unsigned int baudrate)
{
unsigned int baud_divisor = (uartclk + 8 * baudrate)/(16 * baudrate);
/* Enable FIFOs */
writeb(UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
UART_FCR_CLEAR_XMIT | UART_FCR_TRIGGER_4,
(char *)DEBUG_PORT_BASE + (UART_FCR * 4));
/* Select brtc divisor */
writeb(UART_LCR_DLAB, (char *)DEBUG_PORT_BASE + (UART_LCR * 4));
/* Store divisor lsb */
writeb(baud_divisor, (char *)DEBUG_PORT_BASE + (UART_TX * 4));
/* Store divisor msb */
writeb(baud_divisor >> 8, (char *)DEBUG_PORT_BASE + (UART_IER * 4));
/* Set 8N1 mode */
writeb(UART_LCR_WLEN8, (char *)DEBUG_PORT_BASE + (UART_LCR * 4));
/* Disable flow control */
writeb(0, (char *)DEBUG_PORT_BASE + (UART_MCR * 4));
/* Disable receive interrupt(!) */
writeb(0, (char *)DEBUG_PORT_BASE + (UART_IER * 4));
}
#endif
void __init msp_serial_setup(void)
{
char *s;
char *endp;
struct uart_port up;
unsigned int uartclk;
memset(&up, 0, sizeof(up));
/* Check if clock was specified in environment */
s = prom_getenv("uartfreqhz");
if(!(s && *s && (uartclk = simple_strtoul(s, &endp, 10)) && *endp == 0))
uartclk = MSP_BASE_BAUD;
ppfinit("UART clock set to %d\n", uartclk);
/* Initialize first serial port */
up.mapbase = MSP_UART0_BASE;
up.membase = ioremap_nocache(up.mapbase,MSP_UART_REG_LEN);
up.irq = MSP_INT_UART0;
up.uartclk = uartclk;
up.regshift = 2;
up.iotype = UPIO_DWAPB; /* UPIO_MEM like */
up.flags = STD_COM_FLAGS;
up.type = PORT_16550A;
up.line = 0;
up.private_data = (void*)UART0_STATUS_REG;
if (early_serial_setup(&up))
printk(KERN_ERR "Early serial init of port 0 failed\n");
/* Initialize the second serial port, if one exists */
switch (mips_machtype) {
case MACH_MSP4200_EVAL:
case MACH_MSP4200_GW:
case MACH_MSP4200_FPGA:
case MACH_MSP7120_EVAL:
case MACH_MSP7120_GW:
case MACH_MSP7120_FPGA:
/* Enable UART1 on MSP4200 and MSP7120 */
*GPIO_CFG2_REG = 0x00002299;
#ifdef CONFIG_KGDB
/* Initialize UART1 for kgdb since PMON doesn't */
if( DEBUG_PORT_BASE == KSEG1ADDR(MSP_UART1_BASE) ) {
if( mips_machtype == MACH_MSP4200_FPGA
|| mips_machtype == MACH_MSP7120_FPGA )
initDebugPort(uartclk,19200);
else
initDebugPort(uartclk,57600);
}
#endif
break;
default:
return; /* No second serial port, good-bye. */
}
up.mapbase = MSP_UART1_BASE;
up.membase = ioremap_nocache(up.mapbase,MSP_UART_REG_LEN);
up.irq = MSP_INT_UART1;
up.line = 1;
up.private_data = (void*)UART1_STATUS_REG;
if (early_serial_setup(&up))
printk(KERN_ERR "Early serial init of port 1 failed\n");
}