[net-next-2.6.git] / drivers / mtd / maps / sbc_gxx.c

/* sbc_gxx.c -- MTD map driver for Arcom Control Systems SBC-MediaGX,
                SBC-GXm and SBC-GX1 series boards.
 
   Copyright (C) 2001 Arcom Control System Ltd
 
   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

   $Id: sbc_gxx.c,v 1.33 2004/11/28 09:40:40 dwmw2 Exp $

The SBC-MediaGX / SBC-GXx has up to 16 MiB of 
Intel StrataFlash (28F320/28F640) in x8 mode.  

This driver uses the CFI probe and Intel Extended Command Set drivers.

The flash is accessed as follows:

   16 KiB memory window at 0xdc000-0xdffff
   
   Two IO address locations for paging
   
   0x258
       bit 0-7: address bit 14-21
   0x259
       bit 0-1: address bit 22-23
       bit 7:   0 - reset/powered down
                1 - device enabled

The single flash device is divided into 3 partition which appear as 
separate MTD devices.

25/04/2001 AJL (Arcom)  Modified signon strings and partition sizes
                        (to support bzImages up to 638KiB-ish)
*/

// Includes

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <asm/io.h>

#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>

// Defines

// - Hardware specific

#define WINDOW_START 0xdc000

/* Number of bits in offset. */
#define WINDOW_SHIFT 14
#define WINDOW_LENGTH (1 << WINDOW_SHIFT)

/* The bits for the offset into the window. */
#define WINDOW_MASK (WINDOW_LENGTH-1)
#define PAGE_IO 0x258
#define PAGE_IO_SIZE 2

/* bit 7 of 0x259 must be 1 to enable device. */
#define DEVICE_ENABLE 0x8000

// - Flash / Partition sizing

#define MAX_SIZE_KiB             16384
#define BOOT_PARTITION_SIZE_KiB  768
#define DATA_PARTITION_SIZE_KiB  1280
#define APP_PARTITION_SIZE_KiB   6144

// Globals

static volatile int page_in_window = -1; // Current page in window.
static void __iomem *iomapadr;
static DEFINE_SPINLOCK(sbc_gxx_spin);

/* partition_info gives details on the logical partitions that the split the 
 * single flash device into. If the size if zero we use up to the end of the
 * device. */
static struct mtd_partition partition_info[]={
    { .name = "SBC-GXx flash boot partition", 
      .offset = 0, 
      .size =   BOOT_PARTITION_SIZE_KiB*1024 },
    { .name = "SBC-GXx flash data partition", 
      .offset = BOOT_PARTITION_SIZE_KiB*1024, 
      .size = (DATA_PARTITION_SIZE_KiB)*1024 },
    { .name = "SBC-GXx flash application partition", 
      .offset = (BOOT_PARTITION_SIZE_KiB+DATA_PARTITION_SIZE_KiB)*1024 }
};

#define NUM_PARTITIONS 3

static inline void sbc_gxx_page(struct map_info *map, unsigned long ofs)
{
	unsigned long page = ofs >> WINDOW_SHIFT;

	if( page!=page_in_window ) {
		outw( page | DEVICE_ENABLE, PAGE_IO );
		page_in_window = page;
	}
}


static map_word sbc_gxx_read8(struct map_info *map, unsigned long ofs)
{
	map_word ret;
	spin_lock(&sbc_gxx_spin);
	sbc_gxx_page(map, ofs);
	ret.x[0] = readb(iomapadr + (ofs & WINDOW_MASK));
	spin_unlock(&sbc_gxx_spin);
	return ret;
}

static void sbc_gxx_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
{
	while(len) {
		unsigned long thislen = len;
		if (len > (WINDOW_LENGTH - (from & WINDOW_MASK)))
			thislen = WINDOW_LENGTH-(from & WINDOW_MASK);
		
		spin_lock(&sbc_gxx_spin);
		sbc_gxx_page(map, from);
		memcpy_fromio(to, iomapadr + (from & WINDOW_MASK), thislen);
		spin_unlock(&sbc_gxx_spin);
		to += thislen;
		from += thislen;
		len -= thislen;
	}
}

static void sbc_gxx_write8(struct map_info *map, map_word d, unsigned long adr)
{
	spin_lock(&sbc_gxx_spin);
	sbc_gxx_page(map, adr);
	writeb(d.x[0], iomapadr + (adr & WINDOW_MASK));
	spin_unlock(&sbc_gxx_spin);
}

static void sbc_gxx_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
{	
	while(len) {
		unsigned long thislen = len;
		if (len > (WINDOW_LENGTH - (to & WINDOW_MASK)))
			thislen = WINDOW_LENGTH-(to & WINDOW_MASK);
		
		spin_lock(&sbc_gxx_spin);
		sbc_gxx_page(map, to);
		memcpy_toio(iomapadr + (to & WINDOW_MASK), from, thislen);
		spin_unlock(&sbc_gxx_spin);
		to += thislen;
		from += thislen;
		len -= thislen;
	}
}

static struct map_info sbc_gxx_map = {
	.name = "SBC-GXx flash",
	.phys = NO_XIP,
	.size = MAX_SIZE_KiB*1024, /* this must be set to a maximum possible amount
			 of flash so the cfi probe routines find all
			 the chips */
	.bankwidth = 1,
	.read = sbc_gxx_read8,
	.copy_from = sbc_gxx_copy_from,
	.write = sbc_gxx_write8,
	.copy_to = sbc_gxx_copy_to
};

/* MTD device for all of the flash. */
static struct mtd_info *all_mtd;

static void cleanup_sbc_gxx(void)
{
	if( all_mtd ) {
		del_mtd_partitions( all_mtd );
		map_destroy( all_mtd );
	}

	iounmap(iomapadr);
	release_region(PAGE_IO,PAGE_IO_SIZE);
}

static int __init init_sbc_gxx(void)
{
  	iomapadr = ioremap(WINDOW_START, WINDOW_LENGTH);
	if (!iomapadr) {
		printk( KERN_ERR"%s: failed to ioremap memory region\n",
			sbc_gxx_map.name );
		return -EIO;
	}
	
	if (!request_region( PAGE_IO, PAGE_IO_SIZE, "SBC-GXx flash")) {
		printk( KERN_ERR"%s: IO ports 0x%x-0x%x in use\n",
			sbc_gxx_map.name,
			PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1 );
		iounmap(iomapadr);
		return -EAGAIN;
	}
		
	
	printk( KERN_INFO"%s: IO:0x%x-0x%x MEM:0x%x-0x%x\n",
		sbc_gxx_map.name,
		PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1,
		WINDOW_START, WINDOW_START+WINDOW_LENGTH-1 );

	/* Probe for chip. */
	all_mtd = do_map_probe( "cfi_probe", &sbc_gxx_map );
	if( !all_mtd ) {
		cleanup_sbc_gxx();
		return -ENXIO;
	}
	
	all_mtd->owner = THIS_MODULE;

	/* Create MTD devices for each partition. */
	add_mtd_partitions(all_mtd, partition_info, NUM_PARTITIONS );

	return 0;
}

module_init(init_sbc_gxx);
module_exit(cleanup_sbc_gxx);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Arcom Control Systems Ltd.");
MODULE_DESCRIPTION("MTD map driver for SBC-GXm and SBC-GX1 series boards");
Commit	Line	Data
1da177e4 LT	1	/* sbc_gxx.c -- MTD map driver for Arcom Control Systems SBC-MediaGX,
	2	SBC-GXm and SBC-GX1 series boards.
	3
	4	Copyright (C) 2001 Arcom Control System Ltd
	5
	6	This program is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 2 of the License, or
	9	(at your option) any later version.
	10
	11	This program is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
	17	along with this program; if not, write to the Free Software
	18	Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
	19
	20	$Id: sbc_gxx.c,v 1.33 2004/11/28 09:40:40 dwmw2 Exp $
	21
	22	The SBC-MediaGX / SBC-GXx has up to 16 MiB of
	23	Intel StrataFlash (28F320/28F640) in x8 mode.
	24
	25	This driver uses the CFI probe and Intel Extended Command Set drivers.
	26
	27	The flash is accessed as follows:
	28
	29	16 KiB memory window at 0xdc000-0xdffff
	30
	31	Two IO address locations for paging
	32
	33	0x258
	34	bit 0-7: address bit 14-21
	35	0x259
	36	bit 0-1: address bit 22-23
	37	bit 7: 0 - reset/powered down
	38	1 - device enabled
	39
	40	The single flash device is divided into 3 partition which appear as
	41	separate MTD devices.
	42
	43	25/04/2001 AJL (Arcom) Modified signon strings and partition sizes
	44	(to support bzImages up to 638KiB-ish)
	45	*/
	46
	47	// Includes
	48
	49	#include <linux/module.h>
	50	#include <linux/slab.h>
	51	#include <linux/ioport.h>
	52	#include <linux/init.h>
	53	#include <asm/io.h>
	54
	55	#include <linux/mtd/mtd.h>
	56	#include <linux/mtd/map.h>
	57	#include <linux/mtd/partitions.h>
	58
	59	// Defines
	60
	61	// - Hardware specific
	62
	63	#define WINDOW_START 0xdc000
	64
65	/* Number of bits in offset. */
66	#define WINDOW_SHIFT 14
67	#define WINDOW_LENGTH (1 << WINDOW_SHIFT)
68
69	/* The bits for the offset into the window. */
70	#define WINDOW_MASK (WINDOW_LENGTH-1)
71	#define PAGE_IO 0x258
72	#define PAGE_IO_SIZE 2
73
74	/* bit 7 of 0x259 must be 1 to enable device. */
75	#define DEVICE_ENABLE 0x8000
76
77	// - Flash / Partition sizing
78
79	#define MAX_SIZE_KiB 16384
80	#define BOOT_PARTITION_SIZE_KiB 768
81	#define DATA_PARTITION_SIZE_KiB 1280
82	#define APP_PARTITION_SIZE_KiB 6144
83
84	// Globals
85
86	static volatile int page_in_window = -1; // Current page in window.
87	static void __iomem *iomapadr;
88	static DEFINE_SPINLOCK(sbc_gxx_spin);
89
90	/* partition_info gives details on the logical partitions that the split the
91	* single flash device into. If the size if zero we use up to the end of the
92	* device. */
93	static struct mtd_partition partition_info[]={
94	{ .name = "SBC-GXx flash boot partition",
95	.offset = 0,
96	.size = BOOT_PARTITION_SIZE_KiB*1024 },
97	{ .name = "SBC-GXx flash data partition",
98	.offset = BOOT_PARTITION_SIZE_KiB*1024,
99	.size = (DATA_PARTITION_SIZE_KiB)*1024 },
100	{ .name = "SBC-GXx flash application partition",
101	.offset = (BOOT_PARTITION_SIZE_KiB+DATA_PARTITION_SIZE_KiB)*1024 }
102	};
103
104	#define NUM_PARTITIONS 3
105
106	static inline void sbc_gxx_page(struct map_info *map, unsigned long ofs)
107	{
108	unsigned long page = ofs >> WINDOW_SHIFT;
109
110	if( page!=page_in_window ) {
111	outw( page \| DEVICE_ENABLE, PAGE_IO );
112	page_in_window = page;
113	}
114	}
115
116
117	static map_word sbc_gxx_read8(struct map_info *map, unsigned long ofs)
118	{
119	map_word ret;
120	spin_lock(&sbc_gxx_spin);
121	sbc_gxx_page(map, ofs);
122	ret.x[0] = readb(iomapadr + (ofs & WINDOW_MASK));
123	spin_unlock(&sbc_gxx_spin);
124	return ret;
125	}
126
127	static void sbc_gxx_copy_from(struct map_info map, void to, unsigned long from, ssize_t len)
128	{
129	while(len) {
130	unsigned long thislen = len;
131	if (len > (WINDOW_LENGTH - (from & WINDOW_MASK)))
132	thislen = WINDOW_LENGTH-(from & WINDOW_MASK);
133
134	spin_lock(&sbc_gxx_spin);
135	sbc_gxx_page(map, from);
136	memcpy_fromio(to, iomapadr + (from & WINDOW_MASK), thislen);
137	spin_unlock(&sbc_gxx_spin);
138	to += thislen;
139	from += thislen;
140	len -= thislen;
141	}
142	}
143
144	static void sbc_gxx_write8(struct map_info *map, map_word d, unsigned long adr)
145	{
146	spin_lock(&sbc_gxx_spin);
147	sbc_gxx_page(map, adr);
148	writeb(d.x[0], iomapadr + (adr & WINDOW_MASK));
149	spin_unlock(&sbc_gxx_spin);
150	}
151
152	static void sbc_gxx_copy_to(struct map_info map, unsigned long to, const void from, ssize_t len)
153	{
154	while(len) {
155	unsigned long thislen = len;
156	if (len > (WINDOW_LENGTH - (to & WINDOW_MASK)))
157	thislen = WINDOW_LENGTH-(to & WINDOW_MASK);
158
159	spin_lock(&sbc_gxx_spin);
160	sbc_gxx_page(map, to);
161	memcpy_toio(iomapadr + (to & WINDOW_MASK), from, thislen);
162	spin_unlock(&sbc_gxx_spin);
163	to += thislen;
164	from += thislen;
165	len -= thislen;
166	}
167	}
168
169	static struct map_info sbc_gxx_map = {
170	.name = "SBC-GXx flash",
171	.phys = NO_XIP,
172	.size = MAX_SIZE_KiB1024, / this must be set to a maximum possible amount
173	of flash so the cfi probe routines find all
174	the chips */
175	.bankwidth = 1,
176	.read = sbc_gxx_read8,
177	.copy_from = sbc_gxx_copy_from,
178	.write = sbc_gxx_write8,
179	.copy_to = sbc_gxx_copy_to
180	};
181
182	/* MTD device for all of the flash. */
183	static struct mtd_info *all_mtd;
184
185	static void cleanup_sbc_gxx(void)
186	{
187	if( all_mtd ) {
188	del_mtd_partitions( all_mtd );
189	map_destroy( all_mtd );
190	}
191
192	iounmap(iomapadr);
193	release_region(PAGE_IO,PAGE_IO_SIZE);
194	}
195
196	static int __init init_sbc_gxx(void)
197	{
198	iomapadr = ioremap(WINDOW_START, WINDOW_LENGTH);
199	if (!iomapadr) {
200	printk( KERN_ERR"%s: failed to ioremap memory region\n",
201	sbc_gxx_map.name );
202	return -EIO;
203	}
204
205	if (!request_region( PAGE_IO, PAGE_IO_SIZE, "SBC-GXx flash")) {
206	printk( KERN_ERR"%s: IO ports 0x%x-0x%x in use\n",
207	sbc_gxx_map.name,
208	PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1 );
209	iounmap(iomapadr);
210	return -EAGAIN;
211	}
212
213
214	printk( KERN_INFO"%s: IO:0x%x-0x%x MEM:0x%x-0x%x\n",
215	sbc_gxx_map.name,
216	PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1,
217	WINDOW_START, WINDOW_START+WINDOW_LENGTH-1 );
218
219	/* Probe for chip. */
220	all_mtd = do_map_probe( "cfi_probe", &sbc_gxx_map );
221	if( !all_mtd ) {
222	cleanup_sbc_gxx();
223	return -ENXIO;
224	}
225
226	all_mtd->owner = THIS_MODULE;
227
228	/* Create MTD devices for each partition. */
229	add_mtd_partitions(all_mtd, partition_info, NUM_PARTITIONS );
230
231	return 0;
232	}
233
234	module_init(init_sbc_gxx);
235	module_exit(cleanup_sbc_gxx);
236
237	MODULE_LICENSE("GPL");
238	MODULE_AUTHOR("Arcom Control Systems Ltd.");
239	MODULE_DESCRIPTION("MTD map driver for SBC-GXm and SBC-GX1 series boards");