arm: Add Initial TI-Nspire support

This patch adds support for the TI-Nspire platform.

Changes between v1 and v2:
* Added GENERIC_IRQ_CHIP to platform Kconfig

Signed-off-by: Daniel Tang <dt.tangr@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/mach-nspire/Kconfig

@@ -0,0 +1,16 @@
+config ARCH_NSPIRE
+	bool "TI-NSPIRE based"
+	depends on ARCH_MULTI_V4_V5
+	depends on MMU
+	select CPU_ARM926T
+	select COMMON_CLK
+	select GENERIC_CLOCKEVENTS
+	select GENERIC_IRQ_CHIP
+	select SPARSE_IRQ
+	select ARM_AMBA
+	select ARM_VIC
+	select ARM_TIMER_SP804
+	select USE_OF
+	select CLKSRC_OF
+	help
+	  This enables support for systems using the TI-NSPIRE CPU

arch/arm/mach-nspire/Makefile

@@ -0,0 +1,2 @@
+obj-y				+= nspire.o
+obj-y				+= clcd.o

arch/arm/mach-nspire/clcd.c

@@ -0,0 +1,119 @@
+/*
+ *	linux/arch/arm/mach-nspire/clcd.c
+ *
+ *	Copyright (C) 2013 Daniel Tang <tangrs@tangrs.id.au>
+ *
+ * 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/init.h>
+#include <linux/of.h>
+#include <linux/amba/bus.h>
+#include <linux/amba/clcd.h>
+#include <linux/dma-mapping.h>
+
+static struct clcd_panel nspire_cx_lcd_panel = {
+	.mode		= {
+		.name		= "Color LCD",
+		.refresh	= 60,
+		.xres		= 320,
+		.yres		= 240,
+		.sync		= 0,
+		.vmode		= FB_VMODE_NONINTERLACED,
+		.pixclock	= 1,
+		.hsync_len	= 6,
+		.vsync_len	= 1,
+		.right_margin	= 50,
+		.left_margin	= 38,
+		.lower_margin	= 3,
+		.upper_margin	= 17,
+	},
+	.width		= 65, /* ~6.50 cm */
+	.height		= 49, /* ~4.87 cm */
+	.tim2		= TIM2_IPC,
+	.cntl		= CNTL_LCDTFT | CNTL_LCDVCOMP(1),
+	.bpp		= 16,
+	.caps		= CLCD_CAP_565,
+};
+
+static struct clcd_panel nspire_classic_lcd_panel = {
+	.mode		= {
+		.name		= "Grayscale LCD",
+		.refresh	= 60,
+		.xres		= 320,
+		.yres		= 240,
+		.sync		= FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
+		.vmode		= FB_VMODE_NONINTERLACED,
+		.pixclock	= 1,
+		.hsync_len	= 6,
+		.vsync_len	= 1,
+		.right_margin	= 6,
+		.left_margin	= 6,
+	},
+	.width		= 71, /* 7.11cm */
+	.height		= 53, /* 5.33cm */
+	.tim2		= 0x80007d0,
+	.cntl		= CNTL_LCDMONO8,
+	.bpp		= 8,
+	.grayscale	= 1,
+	.caps		= CLCD_CAP_5551,
+};
+
+int nspire_clcd_setup(struct clcd_fb *fb)
+{
+	struct clcd_panel *panel;
+	size_t panel_size;
+	const char *type;
+	dma_addr_t dma;
+	int err;
+
+	BUG_ON(!fb->dev->dev.of_node);
+
+	err = of_property_read_string(fb->dev->dev.of_node, "lcd-type", &type);
+	if (err) {
+		pr_err("CLCD: Could not find lcd-type property\n");
+		return err;
+	}
+
+	if (!strcmp(type, "cx")) {
+		panel = &nspire_cx_lcd_panel;
+	} else if (!strcmp(type, "classic")) {
+		panel = &nspire_classic_lcd_panel;
+	} else {
+		pr_err("CLCD: Unknown lcd-type %s\n", type);
+		return -EINVAL;
+	}
+
+	panel_size = ((panel->mode.xres * panel->mode.yres) * panel->bpp) / 8;
+	panel_size = ALIGN(panel_size, PAGE_SIZE);
+
+	fb->fb.screen_base = dma_alloc_writecombine(&fb->dev->dev,
+		panel_size, &dma, GFP_KERNEL);
+
+	if (!fb->fb.screen_base) {
+		pr_err("CLCD: unable to map framebuffer\n");
+		return -ENOMEM;
+	}
+
+	fb->fb.fix.smem_start = dma;
+	fb->fb.fix.smem_len = panel_size;
+	fb->panel = panel;
+
+	return 0;
+}
+
+int nspire_clcd_mmap(struct clcd_fb *fb, struct vm_area_struct *vma)
+{
+	return dma_mmap_writecombine(&fb->dev->dev, vma,
+		fb->fb.screen_base, fb->fb.fix.smem_start,
+		fb->fb.fix.smem_len);
+}
+
+void nspire_clcd_remove(struct clcd_fb *fb)
+{
+	dma_free_writecombine(&fb->dev->dev, fb->fb.fix.smem_len,
+		fb->fb.screen_base, fb->fb.fix.smem_start);
+}

arch/arm/mach-nspire/clcd.h

@@ -0,0 +1,14 @@
+/*
+ *	linux/arch/arm/mach-nspire/clcd.h
+ *
+ *	Copyright (C) 2013 Daniel Tang <tangrs@tangrs.id.au>
+ *
+ * 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.
+ *
+ */
+
+int nspire_clcd_setup(struct clcd_fb *fb);
+int nspire_clcd_mmap(struct clcd_fb *fb, struct vm_area_struct *vma);
+void nspire_clcd_remove(struct clcd_fb *fb);

arch/arm/mach-nspire/mmio.h

@@ -0,0 +1,20 @@
+/*
+ *	linux/arch/arm/mach-nspire/mmio.h
+ *
+ *	Copyright (C) 2013 Daniel Tang <tangrs@tangrs.id.au>
+ *
+ * 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.
+ *
+ */
+
+#define NSPIRE_MISC_PHYS_BASE		0x900A0000
+#define NSPIRE_MISC_HWRESET		0x08
+
+#define NSPIRE_PWR_PHYS_BASE		0x900B0000
+#define NSPIRE_PWR_VIRT_BASE		0xFEEB0000
+#define NSPIRE_PWR_BUS_DISABLE1		0x18
+#define NSPIRE_PWR_BUS_DISABLE2		0x20
+
+#define NSPIRE_LCD_PHYS_BASE		0xC0000000

arch/arm/mach-nspire/nspire.c

@@ -0,0 +1,89 @@
+/*
+ *	linux/arch/arm/mach-nspire/nspire.c
+ *
+ *	Copyright (C) 2013 Daniel Tang <tangrs@tangrs.id.au>
+ *
+ * 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/init.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/irqchip.h>
+#include <linux/irqchip/arm-vic.h>
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
+#include <linux/amba/bus.h>
+#include <linux/amba/clcd.h>
+#include <linux/clocksource.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach-types.h>
+#include <asm/mach/map.h>
+
+#include <asm/hardware/timer-sp.h>
+
+#include "mmio.h"
+#include "clcd.h"
+
+static const char *nspire_dt_match[] __initconst = {
+	"ti,nspire",
+	"ti,nspire-cx",
+	"ti,nspire-tp",
+	"ti,nspire-clp",
+	NULL,
+};
+
+static void __init nspire_map_io(void)
+{
+	debug_ll_io_init();
+}
+
+static struct clcd_board nspire_clcd_data = {
+	.name		= "LCD",
+	.caps		= CLCD_CAP_5551 | CLCD_CAP_565,
+	.check		= clcdfb_check,
+	.decode		= clcdfb_decode,
+	.setup		= nspire_clcd_setup,
+	.mmap		= nspire_clcd_mmap,
+	.remove		= nspire_clcd_remove,
+};
+
+
+static struct of_dev_auxdata nspire_auxdata[] __initdata = {
+	OF_DEV_AUXDATA("arm,pl111", NSPIRE_LCD_PHYS_BASE,
+			NULL, &nspire_clcd_data),
+	{ }
+};
+
+static void __init nspire_init(void)
+{
+	of_platform_populate(NULL, of_default_bus_match_table,
+			nspire_auxdata, NULL);
+}
+
+static void __init nspire_init_time(void)
+{
+	of_clk_init(NULL);
+	clocksource_of_init();
+}
+
+static void nspire_restart(char mode, const char *cmd)
+{
+	void __iomem *base = ioremap(NSPIRE_MISC_PHYS_BASE, SZ_4K);
+	if (!base)
+		return;
+
+	writel(2, base + NSPIRE_MISC_HWRESET);
+}
+
+DT_MACHINE_START(NSPIRE, "TI-NSPIRE")
+	.dt_compat	= nspire_dt_match,
+	.map_io		= nspire_map_io,
+	.init_time	= nspire_init_time,
+	.init_machine	= nspire_init,
+	.restart	= nspire_restart,
+MACHINE_END