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>

7 files changed, 260 insertions, 0 deletions

diff --git a/arch/arm/mach-nspire/Kconfig b/arch/arm/mach-nspire/Kconfig
new file mode 100644
index 000000000000..59d8f0a70919
--- /dev/null
+++ b/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
diff --git a/arch/arm/mach-nspire/Makefile b/arch/arm/mach-nspire/Makefile
new file mode 100644
index 000000000000..1bec256eba07
--- /dev/null
+++ b/arch/arm/mach-nspire/Makefile
@@ -0,0 +1,2 @@
+obj-y                           += nspire.o
+obj-y                           += clcd.o
diff --git a/arch/arm/mach-nspire/Makefile.boot b/arch/arm/mach-nspire/Makefile.boot
new file mode 100644
index 000000000000..e69de29bb2d1
--- /dev/null
+++ b/arch/arm/mach-nspire/Makefile.boot
diff --git a/arch/arm/mach-nspire/clcd.c b/arch/arm/mach-nspire/clcd.c
new file mode 100644
index 000000000000..abea12617b17
--- /dev/null
+++ b/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);
+}
diff --git a/arch/arm/mach-nspire/clcd.h b/arch/arm/mach-nspire/clcd.h
new file mode 100644
index 000000000000..8c33d2c18371
--- /dev/null
+++ b/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);
diff --git a/arch/arm/mach-nspire/mmio.h b/arch/arm/mach-nspire/mmio.h
new file mode 100644
index 000000000000..8813471af4cf
--- /dev/null
+++ b/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
diff --git a/arch/arm/mach-nspire/nspire.c b/arch/arm/mach-nspire/nspire.c
new file mode 100644
index 000000000000..99e26092a9f7
--- /dev/null
+++ b/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