ARM: 6597/1: Add basic architecture support for VIA/WonderMedia 85xx …

…SoC's

This adds support for the family of Systems-on-Chip produced initially
by VIA and now its subsidiary WonderMedia that have recently become
widespread in lower-end Chinese ARM-based tablets and netbooks.

Support is included for both VT8500 and WM8505, selectable by a
configuration switch at kernel build time.

Included are basic machine initialization files, register and
interrupt definitions, support for the on-chip interrupt controller,
high-precision OS timer, GPIO lines, necessary macros for early debug,
pulse-width-modulated outputs control, as well as platform device
configurations for the specific drivers implemented elsewhere.

Signed-off-by: Alexey Charkov <alchark@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/Kconfig

@@ -875,6 +875,16 @@ config PLAT_SPEAR
 	help
 	  Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
 
+config ARCH_VT8500
+	bool "VIA/WonderMedia 85xx"
+	select CPU_ARM926T
+	select GENERIC_GPIO
+	select ARCH_HAS_CPUFREQ
+	select GENERIC_CLOCKEVENTS
+	select ARCH_REQUIRE_GPIOLIB
+	select HAVE_PWM
+	help
+	  Support for VIA/WonderMedia VT8500/WM85xx System-on-Chip.
 endchoice
 
 #
@@ -1007,6 +1017,8 @@ source "arch/arm/mach-versatile/Kconfig"
 
 source "arch/arm/mach-vexpress/Kconfig"
 
+source "arch/arm/mach-vt8500/Kconfig"
+
 source "arch/arm/mach-w90x900/Kconfig"
 
 # Definitions to make life easier

arch/arm/Makefile

@@ -190,6 +190,7 @@ machine-$(CONFIG_ARCH_U300)		:= u300
 machine-$(CONFIG_ARCH_U8500)		:= ux500
 machine-$(CONFIG_ARCH_VERSATILE)	:= versatile
 machine-$(CONFIG_ARCH_VEXPRESS)		:= vexpress
+machine-$(CONFIG_ARCH_VT8500)		:= vt8500
 machine-$(CONFIG_ARCH_W90X900)		:= w90x900
 machine-$(CONFIG_ARCH_NUC93X)		:= nuc93x
 machine-$(CONFIG_FOOTBRIDGE)		:= footbridge

arch/arm/boot/compressed/Makefile

@@ -29,6 +29,10 @@ ifeq ($(CONFIG_ARCH_SA1100),y)
 OBJS		+= head-sa1100.o
 endif
 
+ifeq ($(CONFIG_ARCH_VT8500),y)
+OBJS		+= head-vt8500.o
+endif
+
 ifeq ($(CONFIG_CPU_XSCALE),y)
 OBJS		+= head-xscale.o
 endif

arch/arm/boot/compressed/head-vt8500.S

@@ -0,0 +1,46 @@
+/*
+ * linux/arch/arm/boot/compressed/head-vt8500.S
+ *
+ * Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
+ *
+ * VIA VT8500 specific tweaks. This is merged into head.S by the linker.
+ *
+ */
+
+#include <linux/linkage.h>
+#include <asm/mach-types.h>
+
+		.section        ".start", "ax"
+
+__VT8500_start:
+	@ Compare the SCC ID register against a list of known values
+	ldr	r1, .SCCID
+	ldr	r3, [r1]
+
+	@ VT8500 override
+	ldr	r4, .VT8500SCC
+	cmp	r3, r4
+	ldreq	r7, .ID_BV07
+	beq	.Lendvt8500
+
+	@ WM8505 override
+	ldr	r4, .WM8505SCC
+	cmp	r3, r4
+	ldreq	r7, .ID_8505
+	beq	.Lendvt8500
+
+	@ Otherwise, leave the bootloader's machine id untouched
+
+.SCCID:
+	.word	0xd8120000
+.VT8500SCC:
+	.word	0x34000102
+.WM8505SCC:
+	.word	0x34260103
+
+.ID_BV07:
+	.word	MACH_TYPE_BV07
+.ID_8505:
+	.word	MACH_TYPE_WM8505_7IN_NETBOOK
+
+.Lendvt8500:

arch/arm/mach-vt8500/Kconfig

@@ -0,0 +1,73 @@
+if ARCH_VT8500
+
+config VTWM_VERSION_VT8500
+	bool
+
+config VTWM_VERSION_WM8505
+	bool
+
+config MACH_BV07
+	bool "Benign BV07-8500 Mini Netbook"
+	depends on ARCH_VT8500
+	select VTWM_VERSION_VT8500
+	help
+	  Add support for the inexpensive 7-inch netbooks sold by many
+	  Chinese distributors under various names. Note that there are
+	  many hardware implementations in identical exterior, make sure
+	  that yours is indeed based on a VIA VT8500 chip.
+
+config MACH_WM8505_7IN_NETBOOK
+	bool "WM8505 7-inch generic netbook"
+	depends on ARCH_VT8500
+	select VTWM_VERSION_WM8505
+	help
+	  Add support for the inexpensive 7-inch netbooks sold by many
+	  Chinese distributors under various names. Note that there are
+	  many hardware implementations in identical exterior, make sure
+	  that yours is indeed based on a WonderMedia WM8505 chip.
+
+comment "LCD panel size"
+
+config WMT_PANEL_800X480
+	bool "7-inch with 800x480 resolution"
+	depends on (FB_VT8500 || FB_WM8505)
+	default y
+	help
+	  These are found in most of the netbooks in generic cases, as
+	  well as in Eken M001 tablets and possibly elsewhere.
+
+	  To select this panel at runtime, say y here and append
+	  'panel=800x480' to your kernel command line. Otherwise, the
+	  largest one available will be used.
+
+config WMT_PANEL_800X600
+	bool "8-inch with 800x600 resolution"
+	depends on (FB_VT8500 || FB_WM8505)
+	help
+	  These are found in Eken M003 tablets and possibly elsewhere.
+
+	  To select this panel at runtime, say y here and append
+	  'panel=800x600' to your kernel command line. Otherwise, the
+	  largest one available will be used.
+
+config WMT_PANEL_1024X576
+	bool "10-inch with 1024x576 resolution"
+	depends on (FB_VT8500 || FB_WM8505)
+	help
+	  These are found in CherryPal netbooks and possibly elsewhere.
+
+	  To select this panel at runtime, say y here and append
+	  'panel=1024x576' to your kernel command line. Otherwise, the
+	  largest one available will be used.
+
+config WMT_PANEL_1024X600
+	bool "10-inch with 1024x600 resolution"
+	depends on (FB_VT8500 || FB_WM8505)
+	help
+	  These are found in Eken M006 tablets and possibly elsewhere.
+
+	  To select this panel at runtime, say y here and append
+	  'panel=1024x600' to your kernel command line. Otherwise, the
+	  largest one available will be used.
+
+endif

arch/arm/mach-vt8500/Makefile

@@ -0,0 +1,9 @@
+obj-y += devices.o gpio.o irq.o timer.o
+
+obj-$(CONFIG_VTWM_VERSION_VT8500) += devices-vt8500.o
+obj-$(CONFIG_VTWM_VERSION_WM8505) += devices-wm8505.o
+
+obj-$(CONFIG_MACH_BV07) += bv07.o
+obj-$(CONFIG_MACH_WM8505_7IN_NETBOOK) += wm8505_7in.o
+
+obj-$(CONFIG_HAVE_PWM) += pwm.o

arch/arm/mach-vt8500/Makefile.boot

@@ -0,0 +1,3 @@
+   zreladdr-y	:= 0x00008000
+params_phys-y	:= 0x00000100
+initrd_phys-y	:= 0x01000000

arch/arm/mach-vt8500/bv07.c

@@ -0,0 +1,77 @@
+/*
+ *  arch/arm/mach-vt8500/bv07.c
+ *
+ *  Copyright (C) 2010 Alexey Charkov <alchark@gmail.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.
+ *
+ * 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/io.h>
+#include <linux/pm.h>
+
+#include <asm/mach-types.h>
+#include <asm/mach/arch.h>
+
+#include "devices.h"
+
+static void __iomem *pmc_hiber;
+
+static struct platform_device *devices[] __initdata = {
+	&vt8500_device_uart0,
+	&vt8500_device_lcdc,
+	&vt8500_device_ehci,
+	&vt8500_device_ge_rops,
+	&vt8500_device_pwm,
+	&vt8500_device_pwmbl,
+	&vt8500_device_rtc,
+};
+
+static void vt8500_power_off(void)
+{
+	local_irq_disable();
+	writew(5, pmc_hiber);
+	asm("mcr%? p15, 0, %0, c7, c0, 4" : : "r" (0));
+}
+
+void __init bv07_init(void)
+{
+#ifdef CONFIG_FB_VT8500
+	void __iomem *gpio_mux_reg = ioremap(wmt_gpio_base + 0x200, 4);
+	if (gpio_mux_reg) {
+		writel(readl(gpio_mux_reg) | 1, gpio_mux_reg);
+		iounmap(gpio_mux_reg);
+	} else {
+		printk(KERN_ERR "Could not remap the GPIO mux register, display may not work properly!\n");
+	}
+#endif
+	pmc_hiber = ioremap(wmt_pmc_base + 0x12, 2);
+	if (pmc_hiber)
+		pm_power_off = &vt8500_power_off;
+	else
+		printk(KERN_ERR "PMC Hibernation register could not be remapped, not enabling power off!\n");
+
+	vt8500_set_resources();
+	platform_add_devices(devices, ARRAY_SIZE(devices));
+	vt8500_gpio_init();
+}
+
+MACHINE_START(BV07, "Benign BV07 Mini Netbook")
+	.boot_params	= 0x00000100,
+	.reserve	= vt8500_reserve_mem,
+	.map_io		= vt8500_map_io,
+	.init_irq	= vt8500_init_irq,
+	.timer		= &vt8500_timer,
+	.init_machine	= bv07_init,
+MACHINE_END

arch/arm/mach-vt8500/devices-vt8500.c

@@ -0,0 +1,91 @@
+/* linux/arch/arm/mach-vt8500/devices-vt8500.c
+ *
+ * Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/platform_device.h>
+
+#include <mach/vt8500_regs.h>
+#include <mach/vt8500_irqs.h>
+#include <mach/i8042.h>
+#include "devices.h"
+
+void __init vt8500_set_resources(void)
+{
+	struct resource tmp[3];
+
+	tmp[0] = wmt_mmio_res(VT8500_LCDC_BASE, SZ_1K);
+	tmp[1] = wmt_irq_res(IRQ_LCDC);
+	wmt_res_add(&vt8500_device_lcdc, tmp, 2);
+
+	tmp[0] = wmt_mmio_res(VT8500_UART0_BASE, 0x1040);
+	tmp[1] = wmt_irq_res(IRQ_UART0);
+	wmt_res_add(&vt8500_device_uart0, tmp, 2);
+
+	tmp[0] = wmt_mmio_res(VT8500_UART1_BASE, 0x1040);
+	tmp[1] = wmt_irq_res(IRQ_UART1);
+	wmt_res_add(&vt8500_device_uart1, tmp, 2);
+
+	tmp[0] = wmt_mmio_res(VT8500_UART2_BASE, 0x1040);
+	tmp[1] = wmt_irq_res(IRQ_UART2);
+	wmt_res_add(&vt8500_device_uart2, tmp, 2);
+
+	tmp[0] = wmt_mmio_res(VT8500_UART3_BASE, 0x1040);
+	tmp[1] = wmt_irq_res(IRQ_UART3);
+	wmt_res_add(&vt8500_device_uart3, tmp, 2);
+
+	tmp[0] = wmt_mmio_res(VT8500_EHCI_BASE, SZ_512);
+	tmp[1] = wmt_irq_res(IRQ_EHCI);
+	wmt_res_add(&vt8500_device_ehci, tmp, 2);
+
+	tmp[0] = wmt_mmio_res(VT8500_GEGEA_BASE, SZ_256);
+	wmt_res_add(&vt8500_device_ge_rops, tmp, 1);
+
+	tmp[0] = wmt_mmio_res(VT8500_PWM_BASE, 0x44);
+	wmt_res_add(&vt8500_device_pwm, tmp, 1);
+
+	tmp[0] = wmt_mmio_res(VT8500_RTC_BASE, 0x2c);
+	tmp[1] = wmt_irq_res(IRQ_RTC);
+	tmp[2] = wmt_irq_res(IRQ_RTCSM);
+	wmt_res_add(&vt8500_device_rtc, tmp, 3);
+}
+
+static void __init vt8500_set_externs(void)
+{
+	/* Non-resource-aware stuff */
+	wmt_ic_base = VT8500_IC_BASE;
+	wmt_gpio_base = VT8500_GPIO_BASE;
+	wmt_pmc_base = VT8500_PMC_BASE;
+	wmt_i8042_base = VT8500_PS2_BASE;
+
+	wmt_nr_irqs = VT8500_NR_IRQS;
+	wmt_timer_irq = IRQ_PMCOS0;
+	wmt_gpio_ext_irq[0] = IRQ_EXT0;
+	wmt_gpio_ext_irq[1] = IRQ_EXT1;
+	wmt_gpio_ext_irq[2] = IRQ_EXT2;
+	wmt_gpio_ext_irq[3] = IRQ_EXT3;
+	wmt_gpio_ext_irq[4] = IRQ_EXT4;
+	wmt_gpio_ext_irq[5] = IRQ_EXT5;
+	wmt_gpio_ext_irq[6] = IRQ_EXT6;
+	wmt_gpio_ext_irq[7] = IRQ_EXT7;
+	wmt_i8042_kbd_irq = IRQ_PS2KBD;
+	wmt_i8042_aux_irq = IRQ_PS2MOUSE;
+}
+
+void __init vt8500_map_io(void)
+{
+	iotable_init(wmt_io_desc, ARRAY_SIZE(wmt_io_desc));
+
+	/* Should be done before interrupts and timers are initialized */
+	vt8500_set_externs();
+}