cs5535-gpio: add AMD CS5535/CS5536 GPIO driver support

This creates a CS5535/CS5536 GPIO driver which uses a gpio_chip backend
(allowing GPIO users to use the generic GPIO API if desired) while also
allowing architecture-specific users directly (via the cs5535_gpio_*
functions).

Tested on an OLPC machine.  Some Leemotes also use CS5536 (with a mips
cpu), which is why this is in drivers/gpio rather than arch/x86.
Currently, it conflicts with older geode GPIO support; once MFGPT support
is reworked to also be more generic, the older geode code will be removed.

Signed-off-by: Andres Salomon <dilinger@collabora.co.uk>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Jordan Crouse <jordan@cosmicpenguin.net>
Cc: David Brownell <david-b@pacbell.net>
Reviewed-by: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 58 insertions, 0 deletions

diff --git a/include/linux/cs5535.h b/include/linux/cs5535.h
new file mode 100644
index 000000000000..cfea689dfa34
--- /dev/null
+++ b/include/linux/cs5535.h
@@ -0,0 +1,58 @@
+/*
+ * AMD CS5535/CS5536 definitions
+ * Copyright (C) 2006  Advanced Micro Devices, Inc.
+ * Copyright (C) 2009  Andres Salomon <dilinger@collabora.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ */
+
+#ifndef _CS5535_H
+#define _CS5535_H
+
+/* MSRs */
+#define MSR_LBAR_SMB            0x5140000B
+#define MSR_LBAR_GPIO           0x5140000C
+#define MSR_LBAR_MFGPT          0x5140000D
+#define MSR_LBAR_ACPI           0x5140000E
+#define MSR_LBAR_PMS            0x5140000F
+
+/* resource sizes */
+#define LBAR_GPIO_SIZE          0xFF
+#define LBAR_MFGPT_SIZE         0x40
+#define LBAR_ACPI_SIZE          0x40
+#define LBAR_PMS_SIZE           0x80
+
+/* GPIOs */
+#define GPIO_OUTPUT_VAL         0x00
+#define GPIO_OUTPUT_ENABLE      0x04
+#define GPIO_OUTPUT_OPEN_DRAIN  0x08
+#define GPIO_OUTPUT_INVERT      0x0C
+#define GPIO_OUTPUT_AUX1        0x10
+#define GPIO_OUTPUT_AUX2        0x14
+#define GPIO_PULL_UP            0x18
+#define GPIO_PULL_DOWN          0x1C
+#define GPIO_INPUT_ENABLE       0x20
+#define GPIO_INPUT_INVERT       0x24
+#define GPIO_INPUT_FILTER       0x28
+#define GPIO_INPUT_EVENT_COUNT  0x2C
+#define GPIO_READ_BACK          0x30
+#define GPIO_INPUT_AUX1         0x34
+#define GPIO_EVENTS_ENABLE      0x38
+#define GPIO_LOCK_ENABLE        0x3C
+#define GPIO_POSITIVE_EDGE_EN   0x40
+#define GPIO_NEGATIVE_EDGE_EN   0x44
+#define GPIO_POSITIVE_EDGE_STS  0x48
+#define GPIO_NEGATIVE_EDGE_STS  0x4C
+
+#define GPIO_MAP_X              0xE0
+#define GPIO_MAP_Y              0xE4
+#define GPIO_MAP_Z              0xE8
+#define GPIO_MAP_W              0xEC
+
+void cs5535_gpio_set(unsigned offset, unsigned int reg);
+void cs5535_gpio_clear(unsigned offset, unsigned int reg);
+int cs5535_gpio_isset(unsigned offset, unsigned int reg);
+
+#endif