[ARM] 4461/1: MXC platform and i.MX31ADS core support

This patch adds the foundation pieces for
the Freescale MXC platforms, including
i.MX2 and i.MX3 based systems.

The bare-bones MX31 support in this patch
boots to the rootdev panic with 8250 serial
console configured "console=ttyS0,115200".
It assumes that Redboot is the boot loader.

Signed-off-by: Quinn Jensen <quinn.jensen@freescale.com>
Acked-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

12 files changed, 508 insertions, 2 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a44c6da..0658e5d 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -324,6 +324,12 @@ config ARCH_NS9XXX
 
 	  <http://www.digi.com/products/microprocessors/index.jsp>
 
+config ARCH_MXC
+	bool "Freescale MXC/iMX-based"
+	select ARCH_MTD_XIP
+	help
+	  Support for Freescale MXC/iMX-based family of processors
+
 config ARCH_PNX4008
 	bool "Philips Nexperia PNX4008 Mobile"
 	help
@@ -456,6 +462,8 @@ source "arch/arm/mach-realview/Kconfig"
 
 source "arch/arm/mach-at91/Kconfig"
 
+source "arch/arm/plat-mxc/Kconfig"
+
 source "arch/arm/mach-netx/Kconfig"
 
 source "arch/arm/mach-ns9xxx/Kconfig"
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index cbd5010..fa4ea9f 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -137,6 +137,8 @@ endif
  textofs-$(CONFIG_ARCH_NS9XXX)	   := 0x00108000
  machine-$(CONFIG_ARCH_DAVINCI)	   := davinci
  machine-$(CONFIG_ARCH_KS8695)     := ks8695
+  incdir-$(CONFIG_ARCH_MXC)	   := mxc
+ machine-$(CONFIG_ARCH_MX3)	   := mx3
 
 ifeq ($(CONFIG_ARCH_EBSA110),y)
 # This is what happens if you forget the IOCS16 line.
@@ -183,6 +185,7 @@ core-$(CONFIG_VFP)		+= arch/arm/vfp/
 core-$(CONFIG_PLAT_IOP)		+= arch/arm/plat-iop/
 core-$(CONFIG_ARCH_OMAP)	+= arch/arm/plat-omap/
 core-$(CONFIG_PLAT_S3C24XX)		+= arch/arm/plat-s3c24xx/
+core-$(CONFIG_ARCH_MXC)		+= arch/arm/plat-mxc/
 
 drivers-$(CONFIG_OPROFILE)      += arch/arm/oprofile/
 drivers-$(CONFIG_ARCH_CLPS7500)	+= drivers/acorn/char/
diff --git a/arch/arm/mach-mx3/Kconfig b/arch/arm/mach-mx3/Kconfig
new file mode 100644
index 0000000..5fe8606
--- /dev/null
+++ b/arch/arm/mach-mx3/Kconfig
@@ -0,0 +1,12 @@
+menu "MX3 Options"
+	depends on ARCH_MX3
+
+config MACH_MX31ADS
+	bool "Support MX31ADS platforms"
+	default y
+	help
+	  Include support for MX31ADS platform. This includes specific
+	  configurations for the board and its peripherals.
+
+endmenu
+
diff --git a/arch/arm/mach-mx3/Makefile b/arch/arm/mach-mx3/Makefile
new file mode 100644
index 0000000..cbec997
--- /dev/null
+++ b/arch/arm/mach-mx3/Makefile
@@ -0,0 +1,8 @@
+#
+# Makefile for the linux kernel.
+#
+
+# Object file lists.
+
+obj-y			:= mm.o time.o
+obj-$(CONFIG_MACH_MX31ADS)	+= mx31ads.o
diff --git a/arch/arm/mach-mx3/Makefile.boot b/arch/arm/mach-mx3/Makefile.boot
new file mode 100644
index 0000000..e1dd366
--- /dev/null
+++ b/arch/arm/mach-mx3/Makefile.boot
@@ -0,0 +1,3 @@
+   zreladdr-y	:= 0x80008000
+params_phys-y	:= 0x80000100
+initrd_phys-y	:= 0x80800000
diff --git a/arch/arm/mach-mx3/mm.c b/arch/arm/mach-mx3/mm.c
new file mode 100644
index 0000000..41dad48
--- /dev/null
+++ b/arch/arm/mach-mx3/mm.c
@@ -0,0 +1,64 @@
+/*
+ *  Copyright (C) 1999,2000 Arm Limited
+ *  Copyright (C) 2000 Deep Blue Solutions Ltd
+ *  Copyright (C) 2002 Shane Nay (shane@minirl.com)
+ *  Copyright 2005-2007 Freescale Semiconductor, Inc. All Rights Reserved.
+ *    - add MX31 specific definitions
+ *
+ * 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 program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <asm/hardware.h>
+#include <asm/pgtable.h>
+#include <asm/mach/map.h>
+#include <asm/arch/common.h>
+
+/*!
+ * @file mm.c
+ *
+ * @brief This file creates static virtual to physical mappings, common to all MX3 boards.
+ *
+ * @ingroup Memory
+ */
+
+/*!
+ * This table defines static virtual address mappings for I/O regions.
+ * These are the mappings common across all MX3 boards.
+ */
+static struct map_desc mxc_io_desc[] __initdata = {
+	{
+		.virtual	= X_MEMC_BASE_ADDR_VIRT,
+		.pfn		= __phys_to_pfn(X_MEMC_BASE_ADDR),
+		.length		= X_MEMC_SIZE,
+		.type		= MT_DEVICE
+	}, {
+		.virtual	= AVIC_BASE_ADDR_VIRT,
+		.pfn		= __phys_to_pfn(AVIC_BASE_ADDR),
+		.length		= AVIC_SIZE,
+		.type		= MT_NONSHARED_DEVICE
+	},
+};
+
+/*!
+ * This function initializes the memory map. It is called during the
+ * system startup to create static physical to virtual memory mappings
+ * for the IO modules.
+ */
+void __init mxc_map_io(void)
+{
+	iotable_init(mxc_io_desc, ARRAY_SIZE(mxc_io_desc));
+}
diff --git a/arch/arm/mach-mx3/mx31ads.c b/arch/arm/mach-mx3/mx31ads.c
new file mode 100644
index 0000000..7e89bdc
--- /dev/null
+++ b/arch/arm/mach-mx3/mx31ads.c
@@ -0,0 +1,142 @@
+/*
+ *  Copyright (C) 2000 Deep Blue Solutions Ltd
+ *  Copyright (C) 2002 Shane Nay (shane@minirl.com)
+ *  Copyright 2005-2007 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * 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 program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/clk.h>
+#include <linux/serial_8250.h>
+
+#include <asm/hardware.h>
+#include <asm/mach-types.h>
+#include <asm/mach/arch.h>
+#include <asm/memory.h>
+#include <asm/mach/map.h>
+#include <asm/arch/common.h>
+
+/*!
+ * @file mx31ads.c
+ *
+ * @brief This file contains the board-specific initialization routines.
+ *
+ * @ingroup System
+ */
+
+#if defined(CONFIG_SERIAL_8250) || defined(CONFIG_SERIAL_8250_MODULE)
+/*!
+ * The serial port definition structure.
+ */
+static struct plat_serial8250_port serial_platform_data[] = {
+	{
+		.membase  = (void *)(PBC_BASE_ADDRESS + PBC_SC16C652_UARTA),
+		.mapbase  = (unsigned long)(CS4_BASE_ADDR + PBC_SC16C652_UARTA),
+		.irq      = EXPIO_INT_XUART_INTA,
+		.uartclk  = 14745600,
+		.regshift = 0,
+		.iotype   = UPIO_MEM,
+		.flags    = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_AUTO_IRQ,
+	}, {
+		.membase  = (void *)(PBC_BASE_ADDRESS + PBC_SC16C652_UARTB),
+		.mapbase  = (unsigned long)(CS4_BASE_ADDR + PBC_SC16C652_UARTB),
+		.irq      = EXPIO_INT_XUART_INTB,
+		.uartclk  = 14745600,
+		.regshift = 0,
+		.iotype   = UPIO_MEM,
+		.flags    = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_AUTO_IRQ,
+	},
+	{},
+};
+
+static struct platform_device serial_device = {
+	.name	= "serial8250",
+	.id	= 0,
+	.dev	= {
+		.platform_data = serial_platform_data,
+	},
+};
+
+static int __init mxc_init_extuart(void)
+{
+	return platform_device_register(&serial_device);
+}
+#else
+static inline int mxc_init_extuart(void)
+{
+	return 0;
+}
+#endif
+
+/*!
+ * This structure defines static mappings for the i.MX31ADS board.
+ */
+static struct map_desc mx31ads_io_desc[] __initdata = {
+	{
+		.virtual	= AIPS1_BASE_ADDR_VIRT,
+		.pfn		= __phys_to_pfn(AIPS1_BASE_ADDR),
+		.length		= AIPS1_SIZE,
+		.type		= MT_NONSHARED_DEVICE
+	}, {
+		.virtual	= SPBA0_BASE_ADDR_VIRT,
+		.pfn		= __phys_to_pfn(SPBA0_BASE_ADDR),
+		.length		= SPBA0_SIZE,
+		.type		= MT_NONSHARED_DEVICE
+	}, {
+		.virtual	= AIPS2_BASE_ADDR_VIRT,
+		.pfn		= __phys_to_pfn(AIPS2_BASE_ADDR),
+		.length		= AIPS2_SIZE,
+		.type		= MT_NONSHARED_DEVICE
+	}, {
+		.virtual	= CS4_BASE_ADDR_VIRT,
+		.pfn		= __phys_to_pfn(CS4_BASE_ADDR),
+		.length		= CS4_SIZE / 2,
+		.type		= MT_DEVICE
+	},
+};
+
+/*!
+ * Set up static virtual mappings.
+ */
+void __init mx31ads_map_io(void)
+{
+	mxc_map_io();
+	iotable_init(mx31ads_io_desc, ARRAY_SIZE(mx31ads_io_desc));
+}
+
+/*!
+ * Board specific initialization.
+ */
+static void __init mxc_board_init(void)
+{
+	mxc_init_extuart();
+}
+
+/*
+ * The following uses standard kernel macros defined in arch.h in order to
+ * initialize __mach_desc_MX31ADS data structure.
+ */
+MACHINE_START(MX31ADS, "Freescale MX31ADS")
+	/* Maintainer: Freescale Semiconductor, Inc. */
+	.phys_io	= AIPS1_BASE_ADDR,
+	.io_pg_offst	= ((AIPS1_BASE_ADDR_VIRT) >> 18) & 0xfffc,
+	.boot_params    = PHYS_OFFSET + 0x100,
+	.map_io         = mx31ads_map_io,
+	.init_irq       = mxc_init_irq,
+	.init_machine   = mxc_board_init,
+	.timer          = &mxc_timer,
+MACHINE_END
diff --git a/arch/arm/mach-mx3/time.c b/arch/arm/mach-mx3/time.c
new file mode 100644
index 0000000..e81fb5c
--- /dev/null
+++ b/arch/arm/mach-mx3/time.c
@@ -0,0 +1,152 @@
+/*
+ * System Timer Interrupt reconfigured to run in free-run mode.
+ * Author: Vitaly Wool
+ * Copyright 2004 MontaVista Software Inc.
+ * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*!
+ * @file time.c
+ * @brief This file contains OS tick and wdog timer implementations.
+ *
+ * This file contains OS tick and wdog timer implementations.
+ *
+ * @ingroup Timers
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <asm/hardware.h>
+#include <asm/mach/time.h>
+#include <asm/io.h>
+#include <asm/arch/common.h>
+
+/*!
+ * This is the timer interrupt service routine to do required tasks.
+ * It also services the WDOG timer at the frequency of twice per WDOG
+ * timeout value. For example, if the WDOG's timeout value is 4 (2
+ * seconds since the WDOG runs at 0.5Hz), it will be serviced once
+ * every 2/2=1 second.
+ *
+ * @param  irq          GPT interrupt source number (not used)
+ * @param  dev_id       this parameter is not used
+ * @return always returns \b IRQ_HANDLED as defined in
+ *         include/linux/interrupt.h.
+ */
+static irqreturn_t mxc_timer_interrupt(int irq, void *dev_id)
+{
+	unsigned int next_match;
+
+	write_seqlock(&xtime_lock);
+
+	if (__raw_readl(MXC_GPT_GPTSR) & GPTSR_OF1) {
+		do {
+			timer_tick();
+			next_match = __raw_readl(MXC_GPT_GPTOCR1) + LATCH;
+			__raw_writel(GPTSR_OF1, MXC_GPT_GPTSR);
+			__raw_writel(next_match, MXC_GPT_GPTOCR1);
+		} while ((signed long)(next_match -
+				       __raw_readl(MXC_GPT_GPTCNT)) <= 0);
+	}
+
+	write_sequnlock(&xtime_lock);
+
+	return IRQ_HANDLED;
+}
+
+/*!
+ * This function is used to obtain the number of microseconds since the last
+ * timer interrupt. Note that interrupts is disabled by do_gettimeofday().
+ *
+ * @return the number of microseconds since the last timer interrupt.
+ */
+static unsigned long mxc_gettimeoffset(void)
+{
+	unsigned long ticks_to_match, elapsed, usec, tick_usec, i;
+
+	/* Get ticks before next timer match */
+	ticks_to_match =
+	    __raw_readl(MXC_GPT_GPTOCR1) - __raw_readl(MXC_GPT_GPTCNT);
+
+	/* We need elapsed ticks since last match */
+	elapsed = LATCH - ticks_to_match;
+
+	/* Now convert them to usec */
+	/* Insure no overflow when calculating the usec below */
+	for (i = 1, tick_usec = tick_nsec / 1000;; i *= 2) {
+		tick_usec /= i;
+		if ((0xFFFFFFFF / tick_usec) > elapsed)
+			break;
+	}
+	usec = (unsigned long)(elapsed * tick_usec) / (LATCH / i);
+
+	return usec;
+}
+
+/*!
+ * The OS tick timer interrupt structure.
+ */
+static struct irqaction timer_irq = {
+	.name = "MXC Timer Tick",
+	.flags = IRQF_DISABLED | IRQF_TIMER,
+	.handler = mxc_timer_interrupt
+};
+
+/*!
+ * This function is used to initialize the GPT to produce an interrupt
+ * based on HZ.  It is called by start_kernel() during system startup.
+ */
+void __init mxc_init_time(void)
+{
+	u32 reg, v;
+	reg = __raw_readl(MXC_GPT_GPTCR);
+	reg &= ~GPTCR_ENABLE;
+	__raw_writel(reg, MXC_GPT_GPTCR);
+	reg |= GPTCR_SWR;
+	__raw_writel(reg, MXC_GPT_GPTCR);
+
+	while ((__raw_readl(MXC_GPT_GPTCR) & GPTCR_SWR) != 0)
+		cpu_relax();
+
+	reg = GPTCR_FRR | GPTCR_CLKSRC_HIGHFREQ;
+	__raw_writel(reg, MXC_GPT_GPTCR);
+
+	/* TODO: get timer rate from clk driver */
+	v = 66500000;
+
+	__raw_writel((v / CLOCK_TICK_RATE) - 1, MXC_GPT_GPTPR);
+
+	if ((v % CLOCK_TICK_RATE) != 0) {
+		pr_info("\nWARNING: Can't generate CLOCK_TICK_RATE at %d Hz\n",
+			CLOCK_TICK_RATE);
+	}
+	pr_info("Actual CLOCK_TICK_RATE is %d Hz\n",
+		v / ((__raw_readl(MXC_GPT_GPTPR) & 0xFFF) + 1));
+
+	reg = __raw_readl(MXC_GPT_GPTCNT);
+	reg += LATCH;
+	__raw_writel(reg, MXC_GPT_GPTOCR1);
+
+	setup_irq(MXC_INT_GPT, &timer_irq);
+
+	reg = __raw_readl(MXC_GPT_GPTCR);
+	reg =
+	    GPTCR_FRR | GPTCR_CLKSRC_HIGHFREQ | GPTCR_STOPEN | GPTCR_DOZEN |
+	    GPTCR_WAITEN | GPTCR_ENMOD | GPTCR_ENABLE;
+	__raw_writel(reg, MXC_GPT_GPTCR);
+
+	__raw_writel(GPTIR_OF1IE, MXC_GPT_GPTIR);
+}
+
+struct sys_timer mxc_timer = {
+	.init = mxc_init_time,
+	.offset = mxc_gettimeoffset,
+};
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index e7904bc9..699b899 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -345,7 +345,8 @@ config CPU_XSC3
 # ARMv6
 config CPU_V6
 	bool "Support ARM V6 processor"
-	depends on ARCH_INTEGRATOR || MACH_REALVIEW_EB || ARCH_OMAP2
+	depends on ARCH_INTEGRATOR || MACH_REALVIEW_EB || ARCH_OMAP2 || ARCH_MX3
+	default y if ARCH_MX3
 	select CPU_32v6
 	select CPU_ABRT_EV6
 	select CPU_CACHE_V6
@@ -359,7 +360,7 @@ config CPU_V6
 config CPU_32v6K
 	bool "Support ARM V6K processor extensions" if !SMP
 	depends on CPU_V6
-	default y if SMP
+	default y if SMP && !ARCH_MX3
 	help
 	  Say Y here if your ARMv6 processor supports the 'K' extension.
 	  This enables the kernel to use some instructions not present
diff --git a/arch/arm/plat-mxc/Kconfig b/arch/arm/plat-mxc/Kconfig
new file mode 100644
index 0000000..03a65c0
--- /dev/null
+++ b/arch/arm/plat-mxc/Kconfig
@@ -0,0 +1,20 @@
+if ARCH_MXC
+
+menu "Freescale MXC Implementations"
+
+choice
+	prompt "MXC/iMX System Type"
+	default 0
+
+config ARCH_MX3
+	bool "MX3-based"
+	help
+	  This enables support for systems based on the Freescale i.MX3 family
+
+endchoice
+
+source "arch/arm/mach-mx3/Kconfig"
+
+endmenu
+
+endif
diff --git a/arch/arm/plat-mxc/Makefile b/arch/arm/plat-mxc/Makefile
new file mode 100644
index 0000000..66ad9c2
--- /dev/null
+++ b/arch/arm/plat-mxc/Makefile
@@ -0,0 +1,10 @@
+#
+# Makefile for the linux kernel.
+#
+
+# Common support
+obj-y := irq.o
+
+obj-m :=
+obj-n :=
+obj-  :=
diff --git a/arch/arm/plat-mxc/irq.c b/arch/arm/plat-mxc/irq.c
new file mode 100644
index 0000000..87d253b
--- /dev/null
+++ b/arch/arm/plat-mxc/irq.c
@@ -0,0 +1,83 @@
+/*
+ *  Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <asm/hardware.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/mach/irq.h>
+#include <asm/arch/common.h>
+
+/*!
+ * Disable interrupt number "irq" in the AVIC
+ *
+ * @param  irq          interrupt source number
+ */
+static void mxc_mask_irq(unsigned int irq)
+{
+	__raw_writel(irq, AVIC_INTDISNUM);
+}
+
+/*!
+ * Enable interrupt number "irq" in the AVIC
+ *
+ * @param  irq          interrupt source number
+ */
+static void mxc_unmask_irq(unsigned int irq)
+{
+	__raw_writel(irq, AVIC_INTENNUM);
+}
+
+static struct irq_chip mxc_avic_chip = {
+	.mask_ack = mxc_mask_irq,
+	.mask = mxc_mask_irq,
+	.unmask = mxc_unmask_irq,
+};
+
+/*!
+ * This function initializes the AVIC hardware and disables all the
+ * interrupts. It registers the interrupt enable and disable functions
+ * to the kernel for each interrupt source.
+ */
+void __init mxc_init_irq(void)
+{
+	int i;
+	u32 reg;
+
+	/* put the AVIC into the reset value with
+	 * all interrupts disabled
+	 */
+	__raw_writel(0, AVIC_INTCNTL);
+	__raw_writel(0x1f, AVIC_NIMASK);
+
+	/* disable all interrupts */
+	__raw_writel(0, AVIC_INTENABLEH);
+	__raw_writel(0, AVIC_INTENABLEL);
+
+	/* all IRQ no FIQ */
+	__raw_writel(0, AVIC_INTTYPEH);
+	__raw_writel(0, AVIC_INTTYPEL);
+	for (i = 0; i < MXC_MAX_INT_LINES; i++) {
+		set_irq_chip(i, &mxc_avic_chip);
+		set_irq_handler(i, handle_level_irq);
+		set_irq_flags(i, IRQF_VALID);
+	}
+
+	/* Set WDOG2's interrupt the highest priority level (bit 28-31) */
+	reg = __raw_readl(AVIC_NIPRIORITY6);
+	reg |= (0xF << 28);
+	__raw_writel(reg, AVIC_NIPRIORITY6);
+
+	printk(KERN_INFO "MXC IRQ initialized\n");
+}