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ea49f8ffae
Add a very basic mmu-less support for coldfire m548x family. This is perhaps also valid for m547x family. The port comprises the serial, tick timer and reboot support. The gpio part compiles but is empty. This gives a functional albeit limited linux for the m548x coldfire family. This has been tested on a Freescale M548xEVB Lite board with a M5484 processor and the default dbug monitor. Signed-off-by: Philippe De Muyter <phdm@macqel.be> Signed-off-by: Greg Ungerer <gerg@uclinux.org>
116 lines
2.7 KiB
C
116 lines
2.7 KiB
C
/***************************************************************************/
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/*
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* linux/arch/m68knommu/platform/548x/config.c
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*
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* Copyright (C) 2010, Philippe De Muyter <phdm@macqel.be>
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*/
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/***************************************************************************/
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#include <linux/kernel.h>
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#include <linux/param.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <asm/machdep.h>
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#include <asm/coldfire.h>
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#include <asm/m548xsim.h>
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#include <asm/mcfuart.h>
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#include <asm/m548xgpt.h>
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/***************************************************************************/
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static struct mcf_platform_uart m548x_uart_platform[] = {
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{
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.mapbase = MCF_MBAR + MCFUART_BASE1,
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.irq = 64 + 35,
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},
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{
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.mapbase = MCF_MBAR + MCFUART_BASE2,
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.irq = 64 + 34,
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},
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{
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.mapbase = MCF_MBAR + MCFUART_BASE3,
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.irq = 64 + 33,
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},
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{
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.mapbase = MCF_MBAR + MCFUART_BASE4,
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.irq = 64 + 32,
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},
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};
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static struct platform_device m548x_uart = {
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.name = "mcfuart",
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.id = 0,
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.dev.platform_data = m548x_uart_platform,
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};
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static struct platform_device *m548x_devices[] __initdata = {
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&m548x_uart,
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};
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/***************************************************************************/
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static void __init m548x_uart_init_line(int line, int irq)
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{
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int rts_cts;
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/* enable io pins */
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switch (line) {
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case 0:
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rts_cts = 0; break;
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case 1:
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rts_cts = MCF_PAR_PSC_RTS_RTS; break;
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case 2:
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rts_cts = MCF_PAR_PSC_RTS_RTS | MCF_PAR_PSC_CTS_CTS; break;
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case 3:
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rts_cts = 0; break;
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}
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__raw_writeb(MCF_PAR_PSC_TXD | rts_cts | MCF_PAR_PSC_RXD,
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MCF_MBAR + MCF_PAR_PSC(line));
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}
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static void __init m548x_uarts_init(void)
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{
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const int nrlines = ARRAY_SIZE(m548x_uart_platform);
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int line;
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for (line = 0; (line < nrlines); line++)
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m548x_uart_init_line(line, m548x_uart_platform[line].irq);
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}
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/***************************************************************************/
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static void mcf548x_reset(void)
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{
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/* disable interrupts and enable the watchdog */
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asm("movew #0x2700, %sr\n");
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__raw_writel(0, MCF_MBAR + MCF_GPT_GMS0);
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__raw_writel(MCF_GPT_GCIR_CNT(1), MCF_MBAR + MCF_GPT_GCIR0);
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__raw_writel(MCF_GPT_GMS_WDEN | MCF_GPT_GMS_CE | MCF_GPT_GMS_TMS(4),
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MCF_MBAR + MCF_GPT_GMS0);
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}
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/***************************************************************************/
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void __init config_BSP(char *commandp, int size)
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{
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mach_reset = mcf548x_reset;
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m548x_uarts_init();
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}
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/***************************************************************************/
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static int __init init_BSP(void)
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{
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platform_add_devices(m548x_devices, ARRAY_SIZE(m548x_devices));
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return 0;
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}
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arch_initcall(init_BSP);
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/***************************************************************************/
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