[MIPS] Wind River 4KC PPMC Eval Board Support

    
Support for the GT-64120-based Wind River 4KC PPMC Evaluation board.

Signed-off-by: Rongkai.Zhan <Rongkai.zhan@windriver.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

7 files changed, 469 insertions, 0 deletions

diff --git a/arch/mips/gt64120/wrppmc/Makefile b/arch/mips/gt64120/wrppmc/Makefile
new file mode 100644
index 0000000..72606b9
--- /dev/null
+++ b/arch/mips/gt64120/wrppmc/Makefile
@@ -0,0 +1,14 @@
+#
+# This file is subject to the terms and conditions of the GNU General Public
+# License.  See the file "COPYING" in the main directory of this archive
+# for more details.
+#
+# Copyright 2006 Wind River System, Inc.
+# Author: Rongkai.Zhan <rongkai.zhan@windriver.com>
+#
+# Makefile for the Wind River MIPS 4KC PPMC Eval Board
+#
+
+obj-y	+= int-handler.o irq.o reset.o setup.o time.o pci.o
+
+EXTRA_AFLAGS := $(CFLAGS)
diff --git a/arch/mips/gt64120/wrppmc/int-handler.S b/arch/mips/gt64120/wrppmc/int-handler.S
new file mode 100644
index 0000000..edee7b3
--- /dev/null
+++ b/arch/mips/gt64120/wrppmc/int-handler.S
@@ -0,0 +1,59 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1995, 1996, 1997, 2003 by Ralf Baechle
+ * Copyright (C) Wind River System Inc. Rongkai.Zhan <rongkai.zhan@windriver.com>
+ */
+#include <asm/asm.h>
+#include <asm/mipsregs.h>
+#include <asm/addrspace.h>
+#include <asm/regdef.h>
+#include <asm/stackframe.h>
+#include <asm/mach-wrppmc/mach-gt64120.h>
+
+	.align	5
+	.set	noat
+NESTED(handle_IRQ, PT_SIZE, sp)
+	SAVE_ALL
+	CLI				# Important: mark KERNEL mode !
+	.set	at
+
+	mfc0	t0, CP0_CAUSE		# get pending interrupts
+	mfc0	t1, CP0_STATUS		# get enabled interrupts
+	and	t0, t0, t1		# get allowed interrupts
+	andi	t0, t0, 0xFF00
+	beqz	t0, 1f
+	move	a1, sp			# Prepare 'struct pt_regs *regs' pointer
+
+	andi	t1, t0, CAUSEF_IP7	# CPU Compare/Count internal timer
+	bnez	t1, handle_cputimer_irq
+	andi	t1, t0, CAUSEF_IP6	# UART 16550 port
+	bnez	t1, handle_uart_irq
+	andi	t1, t0, CAUSEF_IP3	# PCI INT_A
+	bnez	t1, handle_pci_intA_irq
+
+	/* wrong alarm or masked ... */
+1:	j	spurious_interrupt
+	nop
+END(handle_IRQ)
+
+	.align	5
+handle_cputimer_irq:
+	li	a0, WRPPMC_MIPS_TIMER_IRQ
+	jal	do_IRQ
+	j	ret_from_irq
+
+	.align	5
+handle_uart_irq:
+	li	a0, WRPPMC_UART16550_IRQ
+	jal	do_IRQ
+	j	ret_from_irq
+
+	.align	5
+handle_pci_intA_irq:
+	li	a0, WRPPMC_PCI_INTA_IRQ
+	jal	do_IRQ
+	j	ret_from_irq
+
diff --git a/arch/mips/gt64120/wrppmc/irq.c b/arch/mips/gt64120/wrppmc/irq.c
new file mode 100644
index 0000000..8605687
--- /dev/null
+++ b/arch/mips/gt64120/wrppmc/irq.c
@@ -0,0 +1,63 @@
+/*
+ * irq.c: GT64120 Interrupt Controller
+ *
+ * Copyright (C) 2006, Wind River System Inc.
+ * Author: Rongkai.Zhan, <rongkai.zhan@windriver.com>
+ *
+ * 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.
+ */
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kernel_stat.h>
+#include <linux/module.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/timex.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+#include <linux/bitops.h>
+#include <asm/bootinfo.h>
+#include <asm/io.h>
+#include <asm/bitops.h>
+#include <asm/mipsregs.h>
+#include <asm/system.h>
+#include <asm/irq_cpu.h>
+#include <asm/gt64120.h>
+
+extern asmlinkage void handle_IRQ(void);
+
+/**
+ * Initialize GT64120 Interrupt Controller
+ */
+void gt64120_init_pic(void)
+{
+	/* clear CPU Interrupt Cause Registers */
+	GT_WRITE(GT_INTRCAUSE_OFS, (0x1F << 21));
+	GT_WRITE(GT_HINTRCAUSE_OFS, 0x00);
+
+	/* Disable all interrupts from GT64120 bridge chip */
+	GT_WRITE(GT_INTRMASK_OFS, 0x00);
+	GT_WRITE(GT_HINTRMASK_OFS, 0x00);
+	GT_WRITE(GT_PCI0_ICMASK_OFS, 0x00);
+	GT_WRITE(GT_PCI0_HICMASK_OFS, 0x00);
+}
+
+void __init arch_init_irq(void)
+{
+	/* enable all CPU interrupt bits. */
+	set_c0_status(ST0_IM);	/* IE bit is still 0 */
+
+	/* Install MIPS Interrupt Trap Vector */
+	set_except_vector(0, handle_IRQ);
+
+	/* IRQ 0 - 7 are for MIPS common irq_cpu controller */
+	mips_cpu_irq_init(0);
+
+	gt64120_init_pic();
+}
diff --git a/arch/mips/gt64120/wrppmc/pci.c b/arch/mips/gt64120/wrppmc/pci.c
new file mode 100644
index 0000000..2fbe934
--- /dev/null
+++ b/arch/mips/gt64120/wrppmc/pci.c
@@ -0,0 +1,53 @@
+/*
+ * pci.c: GT64120 PCI support.
+ *
+ * Copyright (C) 2006, Wind River System Inc. Rongkai.Zhan <rongkai.zhan@windriver.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+#include <asm/gt64120.h>
+
+extern struct pci_ops gt64120_pci_ops;
+
+static struct resource pci0_io_resource = {
+	.name  = "pci_0 io",
+	.start = GT_PCI_IO_BASE,
+	.end   = GT_PCI_IO_BASE + GT_PCI_IO_SIZE - 1,
+	.flags = IORESOURCE_IO,
+};
+
+static struct resource pci0_mem_resource = {
+	.name  = "pci_0 memory",
+	.start = GT_PCI_MEM_BASE,
+	.end   = GT_PCI_MEM_BASE + GT_PCI_MEM_SIZE - 1,
+	.flags = IORESOURCE_MEM,
+};
+
+static struct pci_controller hose_0 = {
+	.pci_ops	= &gt64120_pci_ops,
+	.io_resource	= &pci0_io_resource,
+	.mem_resource	= &pci0_mem_resource,
+};
+
+static int __init gt64120_pci_init(void)
+{
+	u32 tmp;
+
+	tmp = GT_READ(GT_PCI0_CMD_OFS);		/* Huh??? -- Ralf  */
+	tmp = GT_READ(GT_PCI0_BARE_OFS);
+
+	/* reset the whole PCI I/O space range */
+	ioport_resource.start = GT_PCI_IO_BASE;
+	ioport_resource.end = GT_PCI_IO_BASE + GT_PCI_IO_SIZE - 1;
+
+	register_pci_controller(&hose_0);
+	return 0;
+}
+
+arch_initcall(gt64120_pci_init);
diff --git a/arch/mips/gt64120/wrppmc/reset.c b/arch/mips/gt64120/wrppmc/reset.c
new file mode 100644
index 0000000..b97039c
--- /dev/null
+++ b/arch/mips/gt64120/wrppmc/reset.c
@@ -0,0 +1,50 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1997 Ralf Baechle
+ */
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <asm/io.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+#include <asm/reboot.h>
+#include <asm/system.h>
+#include <asm/cacheflush.h>
+
+void wrppmc_machine_restart(char *command)
+{
+	/*
+	 * Ouch, we're still alive ... This time we take the silver bullet ...
+	 * ... and find that we leave the hardware in a state in which the
+	 * kernel in the flush locks up somewhen during of after the PCI
+	 * detection stuff.
+	 */
+	local_irq_disable();
+	set_c0_status(ST0_BEV | ST0_ERL);
+	change_c0_config(CONF_CM_CMASK, CONF_CM_UNCACHED);
+	flush_cache_all();
+	write_c0_wired(0);
+	__asm__ __volatile__("jr\t%0"::"r"(0xbfc00000));
+}
+
+void wrppmc_machine_halt(void)
+{
+	local_irq_disable();
+
+	printk(KERN_NOTICE "You can safely turn off the power\n");
+	while (1) {
+		__asm__(
+			".set\tmips3\n\t"
+			"wait\n\t"
+			".set\tmips0"
+		);
+	}
+}
+
+void wrppmc_machine_power_off(void)
+{
+	wrppmc_machine_halt();
+}
diff --git a/arch/mips/gt64120/wrppmc/setup.c b/arch/mips/gt64120/wrppmc/setup.c
new file mode 100644
index 0000000..20c591e
--- /dev/null
+++ b/arch/mips/gt64120/wrppmc/setup.c
@@ -0,0 +1,173 @@
+/*
+ * setup.c: Setup pointers to hardware dependent routines.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1996, 1997, 2004 by Ralf Baechle (ralf@linux-mips.org)
+ * Copyright (C) 2006, Wind River System Inc. Rongkai.zhan <rongkai.zhan@windriver.com>
+ */
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/tty.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/pm.h>
+
+#include <asm/io.h>
+#include <asm/bootinfo.h>
+#include <asm/reboot.h>
+#include <asm/time.h>
+#include <asm/gt64120.h>
+
+unsigned long gt64120_base = KSEG1ADDR(0x14000000);
+
+#ifdef WRPPMC_EARLY_DEBUG
+
+static volatile unsigned char * wrppmc_led = \
+	(volatile unsigned char *)KSEG1ADDR(WRPPMC_LED_BASE);
+
+/*
+ * PPMC LED control register:
+ * -) bit[0] controls DS1 LED (1 - OFF, 0 - ON)
+ * -) bit[1] controls DS2 LED (1 - OFF, 0 - ON)
+ * -) bit[2] controls DS4 LED (1 - OFF, 0 - ON)
+ */
+void wrppmc_led_on(int mask)
+{
+	unsigned char value = *wrppmc_led;
+
+	value &= (0xF8 | mask);
+	*wrppmc_led = value;
+}
+
+/* If mask = 0, turn off all LEDs */
+void wrppmc_led_off(int mask)
+{
+	unsigned char value = *wrppmc_led;
+
+	value |= (0x7 & mask);
+	*wrppmc_led = value;
+}
+
+/*
+ * We assume that bootloader has initialized UART16550 correctly
+ */
+void __init wrppmc_early_putc(char ch)
+{
+	static volatile unsigned char *wrppmc_uart = \
+		(volatile unsigned char *)KSEG1ADDR(WRPPMC_UART16550_BASE);
+	unsigned char value;
+
+	/* Wait until Transmit-Holding-Register is empty */
+	while (1) {
+		value = *(wrppmc_uart + 5);
+		if (value & 0x20)
+			break;
+	}
+
+	*wrppmc_uart = ch;
+}
+
+void __init wrppmc_early_printk(const char *fmt, ...)
+{
+	static char pbuf[256] = {'\0', };
+	char *ch = pbuf;
+	va_list args;
+	unsigned int i;
+
+	memset(pbuf, 0, 256);
+	va_start(args, fmt);
+	i = vsprintf(pbuf, fmt, args);
+	va_end(args);
+
+	/* Print the string */
+	while (*ch != '\0') {
+		wrppmc_early_putc(*ch);
+		/* if print '\n', also print '\r' */
+		if (*ch++ == '\n')
+			wrppmc_early_putc('\r');
+	}
+}
+#endif /* WRPPMC_EARLY_DEBUG */
+
+unsigned long __init prom_free_prom_memory(void)
+{
+	return 0;
+}
+
+#ifdef CONFIG_SERIAL_8250
+static void wrppmc_setup_serial(void)
+{
+	struct uart_port up;
+
+	memset(&up, 0x00, sizeof(struct uart_port));
+
+	/*
+	 * A note about mapbase/membase
+	 * -) mapbase is the physical address of the IO port.
+	 * -) membase is an 'ioremapped' cookie.
+	 */
+	up.line = 0;
+	up.type = PORT_16550;
+	up.iotype = UPIO_MEM;
+	up.mapbase = WRPPMC_UART16550_BASE;
+	up.membase = ioremap(up.mapbase, 8);
+	up.irq = WRPPMC_UART16550_IRQ;
+	up.uartclk = WRPPMC_UART16550_CLOCK;
+	up.flags = UPF_SKIP_TEST/* | UPF_BOOT_AUTOCONF */;
+	up.regshift = 0;
+
+	early_serial_setup(&up);
+}
+#endif
+
+void __init plat_setup(void)
+{
+	extern void wrppmc_time_init(void);
+	extern void wrppmc_timer_setup(struct irqaction *);
+	extern void wrppmc_machine_restart(char *command);
+	extern void wrppmc_machine_halt(void);
+	extern void wrppmc_machine_power_off(void);
+
+	_machine_restart = wrppmc_machine_restart;
+	_machine_halt	 = wrppmc_machine_halt;
+	pm_power_off	 = wrppmc_machine_power_off;
+
+	/* Use MIPS Count/Compare Timer */
+	board_time_init   = wrppmc_time_init;
+	board_timer_setup = wrppmc_timer_setup;
+
+	/* This makes the operations of 'in/out[bwl]' to the
+	 * physical address ( < KSEG0) can work via KSEG1
+	 */
+	set_io_port_base(KSEG1);
+
+#ifdef CONFIG_SERIAL_8250
+	wrppmc_setup_serial();
+#endif
+}
+
+const char *get_system_type(void)
+{
+	return "Wind River PPMC (GT64120)";
+}
+
+/*
+ * Initializes basic routines and structures pointers, memory size (as
+ * given by the bios and saves the command line.
+ */
+void __init prom_init(void)
+{
+	mips_machgroup = MACH_GROUP_GALILEO;
+	mips_machtype = MACH_EV64120A;
+
+	add_memory_region(WRPPMC_SDRAM_SCS0_BASE, WRPPMC_SDRAM_SCS0_SIZE, BOOT_MEM_RAM);
+	add_memory_region(WRPPMC_BOOTROM_BASE, WRPPMC_BOOTROM_SIZE, BOOT_MEM_ROM_DATA);
+
+	wrppmc_early_printk("prom_init: GT64120 SDRAM Bank 0: 0x%x - 0x%08lx\n",
+			WRPPMC_SDRAM_SCS0_BASE, (WRPPMC_SDRAM_SCS0_BASE + WRPPMC_SDRAM_SCS0_SIZE));
+}
diff --git a/arch/mips/gt64120/wrppmc/time.c b/arch/mips/gt64120/wrppmc/time.c
new file mode 100644
index 0000000..175d22a
--- /dev/null
+++ b/arch/mips/gt64120/wrppmc/time.c
@@ -0,0 +1,57 @@
+/*
+ * time.c: MIPS CPU Count/Compare timer hookup
+ *
+ * Author: Mark.Zhan, <rongkai.zhan@windriver.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1996, 1997, 2004 by Ralf Baechle (ralf@linux-mips.org)
+ * Copyright (C) 2006, Wind River System Inc.
+ */
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/param.h>	/* for HZ */
+#include <linux/irq.h>
+#include <linux/timex.h>
+#include <linux/interrupt.h>
+
+#include <asm/reboot.h>
+#include <asm/time.h>
+#include <asm/io.h>
+#include <asm/bootinfo.h>
+#include <asm/gt64120.h>
+
+#define WRPPMC_CPU_CLK_FREQ 40000000 /* 40MHZ */
+
+void __init wrppmc_timer_setup(struct irqaction *irq)
+{
+	/* Install ISR for timer interrupt */
+	setup_irq(WRPPMC_MIPS_TIMER_IRQ, irq);
+
+	/* to generate the first timer interrupt */
+	write_c0_compare(mips_hpt_frequency/HZ);
+	write_c0_count(0);
+}
+
+/*
+ * Estimate CPU frequency.  Sets mips_hpt_frequency as a side-effect
+ *
+ * NOTE: We disable all GT64120 timers, and use MIPS processor internal
+ * timer as the source of kernel clock tick.
+ */
+void __init wrppmc_time_init(void)
+{
+	/* Disable GT64120 timers */
+	GT_WRITE(GT_TC_CONTROL_OFS, 0x00);
+	GT_WRITE(GT_TC0_OFS, 0x00);
+	GT_WRITE(GT_TC1_OFS, 0x00);
+	GT_WRITE(GT_TC2_OFS, 0x00);
+	GT_WRITE(GT_TC3_OFS, 0x00);
+
+	/* Use MIPS compare/count internal timer */
+	mips_hpt_frequency = WRPPMC_CPU_CLK_FREQ;
+}