Commit 8e404fff authored by Arve Hjønnevåg's avatar Arve Hjønnevåg Committed by Greg Kroah-Hartman
Browse files

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: default avatarMike A. Chan <mikechan@google.com>
Signed-off-by: default avatarArve Hjønnevåg <arve@android.com>
[Ported to handle x86]
Signed-off-by: default avatarSheng Yang <sheng@linux.intel.com>
Signed-off-by: default avatarYunhong Jiang <yunhong.jiang@intel.com>
Signed-off-by: default avatarXiaohui Xin <xiaohui.xin@intel.com>
Signed-off-by: default avatarJun Nakajima <jun.nakajima@intel.com>
Signed-off-by: default avatarBruce Beare <bruce.j.beare@intel.com>
[Ported to 3.4]
Signed-off-by: default avatarTom Keel <thomas.keel@intel.com>
[Ported to 3.7 and tided for checkpatch etc]
Signed-off-by: default avatarAlan Cox <alan@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 2e82b83d

drivers/staging/goldfish/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -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

+1 −0
Original line number Diff line number Diff line
@@ -3,3 +3,4 @@ 
#



obj-$(CONFIG_GOLDFISH_AUDIO) += goldfish_audio.o

obj-$(CONFIG_MTD_GOLDFISH_NAND)	+= goldfish_nand.o

drivers/staging/goldfish/README

+10 −0
Original line number Diff line number Diff line 
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.c

0 → 100644
+444 −0
Original line number Diff line number Diff line 
/*

 * drivers/mtd/devices/goldfish_nand.c

 *

 * Copyright (C) 2007 Google, Inc.

 * Copyright (C) 2012 Intel, Inc.

 * Copyright (C) 2013 Intel, 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.

 *

 */



#include <linux/io.h>

#include <linux/device.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/ioport.h>

#include <linux/vmalloc.h>

#include <linux/init.h>

#include <linux/mtd/mtd.h>

#include <linux/platform_device.h>



#include <asm/div64.h>



#include "goldfish_nand_reg.h"



struct goldfish_nand {

	spinlock_t              lock;

	unsigned char __iomem  *base;

	struct cmd_params       *cmd_params;

	size_t                  mtd_count;

	struct mtd_info         mtd[0];

};



static u32 goldfish_nand_cmd_with_params(struct mtd_info *mtd,

			enum nand_cmd cmd, u64 addr, u32 len,

			void *ptr, u32 *rv)

{

	u32 cmdp;

	struct goldfish_nand *nand = mtd->priv;

	struct cmd_params *cps = nand->cmd_params;

	unsigned char __iomem  *base = nand->base;



	if (cps == NULL)

		return -1;



	switch (cmd) {

	case NAND_CMD_ERASE:

		cmdp = NAND_CMD_ERASE_WITH_PARAMS;

		break;

	case NAND_CMD_READ:

		cmdp = NAND_CMD_READ_WITH_PARAMS;

		break;

	case NAND_CMD_WRITE:

		cmdp = NAND_CMD_WRITE_WITH_PARAMS;

		break;

	default:

		return -1;

	}

	cps->dev = mtd - nand->mtd;

	cps->addr_high = (u32)(addr >> 32);

	cps->addr_low = (u32)addr;

	cps->transfer_size = len;

	cps->data = (u32)ptr;

	writel(cmdp, base + NAND_COMMAND);

	*rv = cps->result;

	return 0;

}



static u32 goldfish_nand_cmd(struct mtd_info *mtd, enum nand_cmd cmd,

				u64 addr, u32 len, void *ptr)

{

	struct goldfish_nand *nand = mtd->priv;

	u32 rv;

	unsigned long irq_flags;

	unsigned char __iomem  *base = nand->base;



	spin_lock_irqsave(&nand->lock, irq_flags);

	if (goldfish_nand_cmd_with_params(mtd, cmd, addr, len, ptr, &rv)) {

		writel(mtd - nand->mtd, base + NAND_DEV);

		writel((u32)(addr >> 32), base + NAND_ADDR_HIGH);

		writel((u32)addr, base + NAND_ADDR_LOW);

		writel(len, base + NAND_TRANSFER_SIZE);

		writel((u32)ptr, base + NAND_DATA);

		writel(cmd, base + NAND_COMMAND);

		rv = readl(base + NAND_RESULT);

	}

	spin_unlock_irqrestore(&nand->lock, irq_flags);

	return rv;

}



static int goldfish_nand_erase(struct mtd_info *mtd, struct erase_info *instr)

{

	loff_t ofs = instr->addr;

	u32 len = instr->len;

	u32 rem;



	if (ofs + len > mtd->size)

		goto invalid_arg;

	rem = do_div(ofs, mtd->writesize);

	if (rem)

		goto invalid_arg;

	ofs *= (mtd->writesize + mtd->oobsize);



	if (len % mtd->writesize)

		goto invalid_arg;

	len = len / mtd->writesize * (mtd->writesize + mtd->oobsize);



	if (goldfish_nand_cmd(mtd, NAND_CMD_ERASE, ofs, len, NULL) != len) {

		pr_err("goldfish_nand_erase: erase failed, start %llx, len %x, dev_size %llx, erase_size %x\n",

			ofs, len, mtd->size, mtd->erasesize);

		return -EIO;

	}



	instr->state = MTD_ERASE_DONE;

	mtd_erase_callback(instr);



	return 0;



invalid_arg:

	pr_err("goldfish_nand_erase: invalid erase, start %llx, len %x, dev_size %llx, erase_size %x\n",

		ofs, len, mtd->size, mtd->erasesize);

	return -EINVAL;

}



static int goldfish_nand_read_oob(struct mtd_info *mtd, loff_t ofs,

				struct mtd_oob_ops *ops)

{

	u32 rem;



	if (ofs + ops->len > mtd->size)

		goto invalid_arg;

	if (ops->datbuf && ops->len && ops->len != mtd->writesize)

		goto invalid_arg;

	if (ops->ooblen + ops->ooboffs > mtd->oobsize)

		goto invalid_arg;



	rem = do_div(ofs, mtd->writesize);

	if (rem)

		goto invalid_arg;

	ofs *= (mtd->writesize + mtd->oobsize);



	if (ops->datbuf)

		ops->retlen = goldfish_nand_cmd(mtd, NAND_CMD_READ, ofs,

						ops->len, ops->datbuf);

	ofs += mtd->writesize + ops->ooboffs;

	if (ops->oobbuf)

		ops->oobretlen = goldfish_nand_cmd(mtd, NAND_CMD_READ, ofs,

						ops->ooblen, ops->oobbuf);

	return 0;



invalid_arg:

	pr_err("goldfish_nand_read_oob: invalid read, start %llx, len %x, ooblen %x, dev_size %llx, write_size %x\n",

		ofs, ops->len, ops->ooblen, mtd->size, mtd->writesize);

	return -EINVAL;

}



static int goldfish_nand_write_oob(struct mtd_info *mtd, loff_t ofs,

				struct mtd_oob_ops *ops)

{

	u32 rem;



	if (ofs + ops->len > mtd->size)

		goto invalid_arg;

	if (ops->len && ops->len != mtd->writesize)

		goto invalid_arg;

	if (ops->ooblen + ops->ooboffs > mtd->oobsize)

		goto invalid_arg;



	rem = do_div(ofs, mtd->writesize);

	if (rem)

		goto invalid_arg;

	ofs *= (mtd->writesize + mtd->oobsize);



	if (ops->datbuf)

		ops->retlen = goldfish_nand_cmd(mtd, NAND_CMD_WRITE, ofs,

						ops->len, ops->datbuf);

	ofs += mtd->writesize + ops->ooboffs;

	if (ops->oobbuf)

		ops->oobretlen = goldfish_nand_cmd(mtd, NAND_CMD_WRITE, ofs,

						ops->ooblen, ops->oobbuf);

	return 0;



invalid_arg:

	pr_err("goldfish_nand_write_oob: invalid write, start %llx, len %x, ooblen %x, dev_size %llx, write_size %x\n",

		ofs, ops->len, ops->ooblen, mtd->size, mtd->writesize);

	return -EINVAL;

}



static int goldfish_nand_read(struct mtd_info *mtd, loff_t from, size_t len,

				size_t *retlen, u_char *buf)

{

	u32 rem;



	if (from + len > mtd->size)

		goto invalid_arg;

	if (len != mtd->writesize)

		goto invalid_arg;



	rem = do_div(from, mtd->writesize);

	if (rem)

		goto invalid_arg;

	from *= (mtd->writesize + mtd->oobsize);



	*retlen = goldfish_nand_cmd(mtd, NAND_CMD_READ, from, len, buf);

	return 0;



invalid_arg:

	pr_err("goldfish_nand_read: invalid read, start %llx, len %x, dev_size %llx, write_size %x\n",

		from, len, mtd->size, mtd->writesize);

	return -EINVAL;

}



static int goldfish_nand_write(struct mtd_info *mtd, loff_t to, size_t len,

				size_t *retlen, const u_char *buf)

{

	u32 rem;



	if (to + len > mtd->size)

		goto invalid_arg;

	if (len != mtd->writesize)

		goto invalid_arg;



	rem = do_div(to, mtd->writesize);

	if (rem)

		goto invalid_arg;

	to *= (mtd->writesize + mtd->oobsize);



	*retlen = goldfish_nand_cmd(mtd, NAND_CMD_WRITE, to, len, (void *)buf);

	return 0;



invalid_arg:

	pr_err("goldfish_nand_write: invalid write, start %llx, len %x, dev_size %llx, write_size %x\n",

		to, len, mtd->size, mtd->writesize);

	return -EINVAL;

}



static int goldfish_nand_block_isbad(struct mtd_info *mtd, loff_t ofs)

{

	u32 rem;



	if (ofs >= mtd->size)

		goto invalid_arg;



	rem = do_div(ofs, mtd->erasesize);

	if (rem)

		goto invalid_arg;

	ofs *= mtd->erasesize / mtd->writesize;

	ofs *= (mtd->writesize + mtd->oobsize);



	return goldfish_nand_cmd(mtd, NAND_CMD_BLOCK_BAD_GET, ofs, 0, NULL);



invalid_arg:

	pr_err("goldfish_nand_block_isbad: invalid arg, ofs %llx, dev_size %llx, write_size %x\n",

		ofs, mtd->size, mtd->writesize);

	return -EINVAL;

}



static int goldfish_nand_block_markbad(struct mtd_info *mtd, loff_t ofs)

{

	u32 rem;



	if (ofs >= mtd->size)

		goto invalid_arg;



	rem = do_div(ofs, mtd->erasesize);

	if (rem)

		goto invalid_arg;

	ofs *= mtd->erasesize / mtd->writesize;

	ofs *= (mtd->writesize + mtd->oobsize);



	if (goldfish_nand_cmd(mtd, NAND_CMD_BLOCK_BAD_SET, ofs, 0, NULL) != 1)

		return -EIO;

	return 0;



invalid_arg:

	pr_err("goldfish_nand_block_markbad: invalid arg, ofs %llx, dev_size %llx, write_size %x\n",

		ofs, mtd->size, mtd->writesize);

	return -EINVAL;

}



static int nand_setup_cmd_params(struct platform_device *pdev,

						struct goldfish_nand *nand)

{

	u64 paddr;

	unsigned char __iomem  *base = nand->base;



	nand->cmd_params = devm_kzalloc(&pdev->dev,

					sizeof(struct cmd_params), GFP_KERNEL);

	if (!nand->cmd_params)

		return -1;



	paddr = __pa(nand->cmd_params);

	writel((u32)(paddr >> 32), base + NAND_CMD_PARAMS_ADDR_HIGH);

	writel((u32)paddr, base + NAND_CMD_PARAMS_ADDR_LOW);

	return 0;

}



static int goldfish_nand_init_device(struct platform_device *pdev,

					struct goldfish_nand *nand, int id)

{

	u32 name_len;

	u32 result;

	u32 flags;

	unsigned long irq_flags;

	unsigned char __iomem  *base = nand->base;

	struct mtd_info *mtd = &nand->mtd[id];

	char *name;



	spin_lock_irqsave(&nand->lock, irq_flags);

	writel(id, base + NAND_DEV);

	flags = readl(base + NAND_DEV_FLAGS);

	name_len = readl(base + NAND_DEV_NAME_LEN);

	mtd->writesize = readl(base + NAND_DEV_PAGE_SIZE);

	mtd->size = readl(base + NAND_DEV_SIZE_LOW);

	mtd->size |= (u64)readl(base + NAND_DEV_SIZE_HIGH) << 32;

	mtd->oobsize = readl(base + NAND_DEV_EXTRA_SIZE);

	mtd->oobavail = mtd->oobsize;

	mtd->erasesize = readl(base + NAND_DEV_ERASE_SIZE) /

			(mtd->writesize + mtd->oobsize) * mtd->writesize;

	do_div(mtd->size, mtd->writesize + mtd->oobsize);

	mtd->size *= mtd->writesize;

	dev_dbg(&pdev->dev, 

		"goldfish nand dev%d: size %llx, page %d, extra %d, erase %d\n",

		       id, mtd->size, mtd->writesize, mtd->oobsize, mtd->erasesize);

	spin_unlock_irqrestore(&nand->lock, irq_flags);



	mtd->priv = nand;



	mtd->name = name = devm_kzalloc(&pdev->dev, name_len + 1, GFP_KERNEL);

	if (name == NULL)

		return -ENOMEM;



	result = goldfish_nand_cmd(mtd, NAND_CMD_GET_DEV_NAME, 0, name_len,

									name);

	if (result != name_len) {

		dev_err(&pdev->dev, 

			"goldfish_nand_init_device failed to get dev name %d != %d\n",

			       result, name_len);

		return -ENODEV;

	}

	((char *) mtd->name)[name_len] = '\0';



	/* Setup the MTD structure */

	mtd->type = MTD_NANDFLASH;

	mtd->flags = MTD_CAP_NANDFLASH;

	if (flags & NAND_DEV_FLAG_READ_ONLY)

		mtd->flags &= ~MTD_WRITEABLE;

	if (flags & NAND_DEV_FLAG_CMD_PARAMS_CAP)

		nand_setup_cmd_params(pdev, nand);



	mtd->owner = THIS_MODULE;

	mtd->_erase = goldfish_nand_erase;

	mtd->_read = goldfish_nand_read;

	mtd->_write = goldfish_nand_write;

	mtd->_read_oob = goldfish_nand_read_oob;

	mtd->_write_oob = goldfish_nand_write_oob;

	mtd->_block_isbad = goldfish_nand_block_isbad;

	mtd->_block_markbad = goldfish_nand_block_markbad;



	if (mtd_device_register(mtd, NULL, 0))

		return -EIO;



	return 0;

}



static int goldfish_nand_probe(struct platform_device *pdev)

{

	u32 num_dev;

	int i;

	int err;

	u32 num_dev_working;

	u32 version;

	struct resource *r;

	struct goldfish_nand *nand;

	unsigned char __iomem  *base;



	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	if (r == NULL)

		return -ENODEV;



	base = devm_ioremap(&pdev->dev, r->start, PAGE_SIZE);

	if (base == NULL)

		return -ENOMEM;



	version = readl(base + NAND_VERSION);

	if (version != NAND_VERSION_CURRENT) {

		dev_err(&pdev->dev, 

			"goldfish_nand_init: version mismatch, got %d, expected %d\n",

				version, NAND_VERSION_CURRENT);

		return -ENODEV;

	}

	num_dev = readl(base + NAND_NUM_DEV);

	if (num_dev == 0)

		return -ENODEV;



	nand = devm_kzalloc(&pdev->dev, sizeof(*nand) + 

				sizeof(struct mtd_info) * num_dev, GFP_KERNEL);

	if (nand == NULL)

		return -ENOMEM;



	spin_lock_init(&nand->lock);

	nand->base = base;

	nand->mtd_count = num_dev;

	platform_set_drvdata(pdev, nand);



	num_dev_working = 0;

	for (i = 0; i < num_dev; i++) {

		err = goldfish_nand_init_device(pdev, nand, i);

		if (err == 0)

			num_dev_working++;

	}

	if (num_dev_working == 0)

		return -ENODEV;

	return 0;

}



static int goldfish_nand_remove(struct platform_device *pdev)

{

	struct goldfish_nand *nand = platform_get_drvdata(pdev);

	int i;

	for (i = 0; i < nand->mtd_count; i++) {

		if (nand->mtd[i].name)

			mtd_device_unregister(&nand->mtd[i]);

	}

	return 0;

}



static struct platform_driver goldfish_nand_driver = {

	.probe		= goldfish_nand_probe,

	.remove		= goldfish_nand_remove,

	.driver = {

		.name = "goldfish_nand"

	}

};



module_platform_driver(goldfish_nand_driver);

MODULE_LICENSE("GPL");

drivers/staging/goldfish/goldfish_nand_reg.h

0 → 100644
+72 −0
Original line number Diff line number Diff line 
/* 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

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