goldfish: NAND flash driver

Fold together the NAND driver for Goldfish from Arve with cleanups by
Jun Nakajima and a tidy up to 3.7 and checkpatch.

This provides a virtual flash driver for the Goldfish Android Virtual Platform,
and which is normally used as the root file system when testing emulated
devices.
Signed-off-by: Mike A. Chan <mikechan@google.com>
Signed-off-by: Arve Hjønnevåg <arve@android.com>
[Ported to handle x86]
Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Signed-off-by: Xiaohui Xin <xiaohui.xin@intel.com>
Signed-off-by: Jun Nakajima <jun.nakajima@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
[Ported to 3.4]
Signed-off-by: Tom Keel <thomas.keel@intel.com>
[Ported to 3.7 and tided for checkpatch etc]
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/goldfish/Kconfig

@@ -4,3 +4,9 @@ config GOLDFISH_AUDIO
 	---help---
 	  Emulated audio channel for the Goldfish Android Virtual Device
 
+config MTD_GOLDFISH_NAND
+	tristate "Goldfish NAND device"
+	depends on GOLDFISH
+	help
+	  Drives the emulated NAND flash device on the Google Goldfish
+	  Android virtual device.

drivers/staging/goldfish/Makefile

@@ -3,3 +3,4 @@
 #
 
 obj-$(CONFIG_GOLDFISH_AUDIO) += goldfish_audio.o
+obj-$(CONFIG_MTD_GOLDFISH_NAND)	+= goldfish_nand.o

drivers/staging/goldfish/README

+Audio
+-----
 - Move to using the ALSA framework not faking it
 - Fix the wrong user page DMA (moving to ALSA may fix that too)
+
+NAND
+----
+- Switch from spinlock to mutex
+- Remove excess checking of parameters in calls
+- Use dma coherent memory not kmalloc/__pa for the memory (this is just
+  a cleanliness issue not a correctness one)
+

drivers/staging/goldfish/goldfish_nand_reg.h

+/* drivers/mtd/devices/goldfish_nand_reg.h
+**
+** Copyright (C) 2007 Google, Inc.
+**
+** 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.
+**
+*/
+
+#ifndef GOLDFISH_NAND_REG_H
+#define GOLDFISH_NAND_REG_H
+
+enum nand_cmd {
+	NAND_CMD_GET_DEV_NAME,  /* Write device name for NAND_DEV to NAND_DATA (vaddr) */
+	NAND_CMD_READ,
+	NAND_CMD_WRITE,
+	NAND_CMD_ERASE,
+	NAND_CMD_BLOCK_BAD_GET, /* NAND_RESULT is 1 if block is bad, 0 if it is not */
+	NAND_CMD_BLOCK_BAD_SET,
+	NAND_CMD_READ_WITH_PARAMS,
+	NAND_CMD_WRITE_WITH_PARAMS,
+	NAND_CMD_ERASE_WITH_PARAMS
+};
+
+enum nand_dev_flags {
+	NAND_DEV_FLAG_READ_ONLY = 0x00000001,
+	NAND_DEV_FLAG_CMD_PARAMS_CAP = 0x00000002,
+};
+
+#define NAND_VERSION_CURRENT (1)
+
+enum nand_reg {
+	/* Global */
+	NAND_VERSION        = 0x000,
+	NAND_NUM_DEV        = 0x004,
+	NAND_DEV            = 0x008,
+
+	/* Dev info */
+	NAND_DEV_FLAGS      = 0x010,
+	NAND_DEV_NAME_LEN   = 0x014,
+	NAND_DEV_PAGE_SIZE  = 0x018,
+	NAND_DEV_EXTRA_SIZE = 0x01c,
+	NAND_DEV_ERASE_SIZE = 0x020,
+	NAND_DEV_SIZE_LOW   = 0x028,
+	NAND_DEV_SIZE_HIGH  = 0x02c,
+
+	/* Command */
+	NAND_RESULT         = 0x040,
+	NAND_COMMAND        = 0x044,
+	NAND_DATA           = 0x048,
+	NAND_TRANSFER_SIZE  = 0x04c,
+	NAND_ADDR_LOW       = 0x050,
+	NAND_ADDR_HIGH      = 0x054,
+	NAND_CMD_PARAMS_ADDR_LOW = 0x058,
+	NAND_CMD_PARAMS_ADDR_HIGH = 0x05c,
+};
+
+struct cmd_params {
+	uint32_t dev;
+	uint32_t addr_low;
+	uint32_t addr_high;
+	uint32_t transfer_size;
+	uint32_t data;
+	uint32_t result;
+};
+#endif