[PATCH 3/6 v2] input: Add support for VIA VT8500 and compatibles in i8042

[Alexey Charkov <alchark@gmail.com>]

VIA and WonderMedia Systems-on-Chip feature a standard i8042-compatible
keyboard and mouse controller. This adds necessary glue to enable use
of the standard driver with these systems.

Signed-off-by: Alexey Charkov <alchark@gmail.com>
---

Please review and (if appropriate) commit to a relevant git tree for
further integration in 2.6.38.

Previous version of this code was 'Acked-by: Dmitry Torokhov <dtor@mail.ru>'
This one only differs by using runtime-selected IRQ definitions instead
of static compile-time preprocessor macros.

Relevant register and interrupt definitions are provided by PATCH 1/6 in
this series, so one would need that to make use of this code.

 drivers/input/serio/Kconfig        |    3 +-
 drivers/input/serio/i8042-vt8500.h |   74 ++++++++++++++++++++++++++++++++++++
 drivers/input/serio/i8042.h        |    2 +
 3 files changed, 78 insertions(+), 1 deletions(-)
 create mode 100644 drivers/input/serio/i8042-vt8500.h

diff --git a/drivers/input/serio/Kconfig b/drivers/input/serio/Kconfig
index 6256233..ff799f3 100644
--- a/drivers/input/serio/Kconfig
+++ b/drivers/input/serio/Kconfig
@@ -21,7 +21,8 @@ if SERIO
 config SERIO_I8042
 	tristate "i8042 PC Keyboard controller" if EMBEDDED || !X86
 	default y
-	depends on !PARISC && (!ARM || ARCH_SHARK || FOOTBRIDGE_HOST) && \
+	depends on !PARISC && \
+		  (!ARM || ARCH_SHARK || ARCH_VT8500 || FOOTBRIDGE_HOST) && \
 		   (!SUPERH || SH_CAYMAN) && !M68K && !BLACKFIN
 	help
 	  i8042 is the chip over which the standard AT keyboard and PS/2
diff --git a/drivers/input/serio/i8042-vt8500.h b/drivers/input/serio/i8042-vt8500.h
new file mode 100644
index 0000000..4ff9e1c
--- /dev/null
+++ b/drivers/input/serio/i8042-vt8500.h
@@ -0,0 +1,74 @@
+#ifndef _I8042_VT8500_H
+#define _I8042_VT8500_H
+
+#include <mach/mmio_regs.h>
+#include <mach/irq_defs.h>
+
+/*
+ * 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.
+ */
+
+static void __iomem *regbase;
+
+/*
+ * Names.
+ */
+
+#define I8042_KBD_PHYS_DESC "vt8500ps2/serio0"
+#define I8042_AUX_PHYS_DESC "vt8500ps2/serio1"
+#define I8042_MUX_PHYS_DESC "vt8500ps2/serio%d"
+
+/*
+ * IRQs.
+ */
+
+#define I8042_KBD_IRQ	(wmt_current_irqs->ps2kbd)
+#define I8042_AUX_IRQ	(wmt_current_irqs->ps2mouse)
+
+
+/*
+ * Register numbers.
+ */
+
+#define I8042_COMMAND_REG	(regbase + 0x4)
+#define I8042_STATUS_REG	(regbase + 0x4)
+#define I8042_DATA_REG		(regbase + 0x0)
+
+static inline int i8042_read_data(void)
+{
+	return readl(I8042_DATA_REG);
+}
+
+static inline int i8042_read_status(void)
+{
+	return readl(I8042_STATUS_REG);
+}
+
+static inline void i8042_write_data(int val)
+{
+	writel(val, I8042_DATA_REG);
+}
+
+static inline void i8042_write_command(int val)
+{
+	writel(val, I8042_COMMAND_REG);
+}
+
+static inline int i8042_platform_init(void)
+{
+	i8042_reset = true;
+	regbase = ioremap(wmt_current_regs->ps2, SZ_1K);
+	if (!regbase)
+		return -ENODEV;
+
+	return 0;
+}
+
+static inline void i8042_platform_exit(void)
+{
+	iounmap(regbase);
+}
+
+#endif /* _I8042_VT8500_H */
diff --git a/drivers/input/serio/i8042.h b/drivers/input/serio/i8042.h
index cbc1beb..bdb2aeb 100644
--- a/drivers/input/serio/i8042.h
+++ b/drivers/input/serio/i8042.h
@@ -16,6 +16,8 @@
 
 #if defined(CONFIG_MACH_JAZZ)
 #include "i8042-jazzio.h"
+#elif defined(CONFIG_ARCH_VT8500)
+#include "i8042-vt8500.h"
 #elif defined(CONFIG_SGI_HAS_I8042)
 #include "i8042-ip22io.h"
 #elif defined(CONFIG_SNI_RM)
-- 
1.7.3.2