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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/mips/pmc-sierra/msp71xx/msp_serial.c
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/*

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 * The setup file for serial related hardware on PMC-Sierra MSP processors.

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 *

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 * Copyright 2005 PMC-Sierra, Inc.

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 *

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 *  This program is free software; you can redistribute  it and/or modify it

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 *  under  the terms of  the GNU General  Public License as published by the

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 *  Free Software Foundation;  either version 2 of the  License, or (at your

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 *  option) any later version.

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 *

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 *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED

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 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF

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 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN

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 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,

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 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

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 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF

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 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON

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 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT

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 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

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 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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 *

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 *  You should have received a copy of the  GNU General Public License along

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 *  with this program; if not, write  to the Free Software Foundation, Inc.,

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 *  675 Mass Ave, Cambridge, MA 02139, USA.

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 */

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#include <linux/serial.h>

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#include <linux/serial_core.h>

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#include <linux/serial_reg.h>

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#include <asm/bootinfo.h>

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#include <asm/io.h>

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#include <asm/processor.h>

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#include <asm/serial.h>

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#include <linux/serial_8250.h>

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#include <msp_prom.h>

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#include <msp_int.h>

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#include <msp_regs.h>

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void __init msp_serial_setup(void)

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{

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	char    *s;

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	char    *endp;

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	struct uart_port up;

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	unsigned int uartclk;

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	memset(&up, 0, sizeof(up));

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	/* Check if clock was specified in environment */

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	s = prom_getenv("uartfreqhz");

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	if(!(s && *s && (uartclk = simple_strtoul(s, &endp, 10)) && *endp == 0))

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		uartclk = MSP_BASE_BAUD;

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	ppfinit("UART clock set to %d\n", uartclk);

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	/* Initialize first serial port */

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	up.mapbase      = MSP_UART0_BASE;

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	up.membase      = ioremap_nocache(up.mapbase, MSP_UART_REG_LEN);

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	up.irq          = MSP_INT_UART0;

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	up.uartclk      = uartclk;

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	up.regshift     = 2;

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	up.iotype       = UPIO_DWAPB; /* UPIO_MEM like */

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	up.flags        = ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST;

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	up.type         = PORT_16550A;

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	up.line         = 0;

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	up.private_data		= (void*)UART0_STATUS_REG;

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	if (early_serial_setup(&up))

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		printk(KERN_ERR "Early serial init of port 0 failed\n");

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	/* Initialize the second serial port, if one exists */

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	switch (mips_machtype) {

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		case MACH_MSP4200_EVAL:

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		case MACH_MSP4200_GW:

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		case MACH_MSP4200_FPGA:

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		case MACH_MSP7120_EVAL:

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		case MACH_MSP7120_GW:

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		case MACH_MSP7120_FPGA:

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			/* Enable UART1 on MSP4200 and MSP7120 */

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			*GPIO_CFG2_REG = 0x00002299;

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			break;

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		default:

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			return; /* No second serial port, good-bye. */

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	}

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	up.mapbase      = MSP_UART1_BASE;

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	up.membase      = ioremap_nocache(up.mapbase, MSP_UART_REG_LEN);

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	up.irq          = MSP_INT_UART1;

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	up.line         = 1;

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	up.private_data		= (void*)UART1_STATUS_REG;

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	if (early_serial_setup(&up))

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		printk(KERN_ERR "Early serial init of port 1 failed\n");

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}

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