[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / mtd / devices / ms02-nv.c

/*
 *	Copyright (c) 2001 Maciej W. Rozycki
 *
 *	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.
 */

#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mtd/mtd.h>
#include <linux/slab.h>
#include <linux/types.h>

#include <asm/addrspace.h>
#include <asm/bootinfo.h>
#include <asm/dec/ioasic_addrs.h>
#include <asm/dec/kn02.h>
#include <asm/dec/kn03.h>
#include <asm/io.h>
#include <asm/paccess.h>

#include "ms02-nv.h"


static char version[] __initdata =
	"ms02-nv.c: v.1.0.0  13 Aug 2001  Maciej W. Rozycki.\n";

MODULE_AUTHOR("Maciej W. Rozycki <macro@linux-mips.org>");
MODULE_DESCRIPTION("DEC MS02-NV NVRAM module driver");
MODULE_LICENSE("GPL");


/*
 * Addresses we probe for an MS02-NV at.  Modules may be located
 * at any 8MiB boundary within a 0MiB up to 112MiB range or at any 32MiB
 * boundary within a 0MiB up to 448MiB range.  We don't support a module
 * at 0MiB, though.
 */
static ulong ms02nv_addrs[] __initdata = {
	0x07000000, 0x06800000, 0x06000000, 0x05800000, 0x05000000,
	0x04800000, 0x04000000, 0x03800000, 0x03000000, 0x02800000,
	0x02000000, 0x01800000, 0x01000000, 0x00800000
};

static const char ms02nv_name[] = "DEC MS02-NV NVRAM";
static const char ms02nv_res_diag_ram[] = "Diagnostic RAM";
static const char ms02nv_res_user_ram[] = "General-purpose RAM";
static const char ms02nv_res_csr[] = "Control and status register";

static struct mtd_info *root_ms02nv_mtd;


static int ms02nv_read(struct mtd_info *mtd, loff_t from,
			size_t len, size_t *retlen, u_char *buf)
{
	struct ms02nv_private *mp = mtd->priv;

	if (from + len > mtd->size)
		return -EINVAL;

	memcpy(buf, mp->uaddr + from, len);
	*retlen = len;

	return 0;
}

static int ms02nv_write(struct mtd_info *mtd, loff_t to,
			size_t len, size_t *retlen, const u_char *buf)
{
	struct ms02nv_private *mp = mtd->priv;

	if (to + len > mtd->size)
		return -EINVAL;

	memcpy(mp->uaddr + to, buf, len);
	*retlen = len;

	return 0;
}


static inline uint ms02nv_probe_one(ulong addr)
{
	ms02nv_uint *ms02nv_diagp;
	ms02nv_uint *ms02nv_magicp;
	uint ms02nv_diag;
	uint ms02nv_magic;
	size_t size;

	int err;

	/*
	 * The firmware writes MS02NV_ID at MS02NV_MAGIC and also
	 * a diagnostic status at MS02NV_DIAG.
	 */
	ms02nv_diagp = (ms02nv_uint *)(CKSEG1ADDR(addr + MS02NV_DIAG));
	ms02nv_magicp = (ms02nv_uint *)(CKSEG1ADDR(addr + MS02NV_MAGIC));
	err = get_dbe(ms02nv_magic, ms02nv_magicp);
	if (err)
		return 0;
	if (ms02nv_magic != MS02NV_ID)
		return 0;

	ms02nv_diag = *ms02nv_diagp;
	size = (ms02nv_diag & MS02NV_DIAG_SIZE_MASK) << MS02NV_DIAG_SIZE_SHIFT;
	if (size > MS02NV_CSR)
		size = MS02NV_CSR;

	return size;
}

static int __init ms02nv_init_one(ulong addr)
{
	struct mtd_info *mtd;
	struct ms02nv_private *mp;
	struct resource *mod_res;
	struct resource *diag_res;
	struct resource *user_res;
	struct resource *csr_res;
	ulong fixaddr;
	size_t size, fixsize;

	static int version_printed;

	int ret = -ENODEV;

	/* The module decodes 8MiB of address space. */
	mod_res = kzalloc(sizeof(*mod_res), GFP_KERNEL);
	if (!mod_res)
		return -ENOMEM;

	mod_res->name = ms02nv_name;
	mod_res->start = addr;
	mod_res->end = addr + MS02NV_SLOT_SIZE - 1;
	mod_res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
	if (request_resource(&iomem_resource, mod_res) < 0)
		goto err_out_mod_res;

	size = ms02nv_probe_one(addr);
	if (!size)
		goto err_out_mod_res_rel;

	if (!version_printed) {
		printk(KERN_INFO "%s", version);
		version_printed = 1;
	}

	ret = -ENOMEM;
	mtd = kzalloc(sizeof(*mtd), GFP_KERNEL);
	if (!mtd)
		goto err_out_mod_res_rel;
	mp = kzalloc(sizeof(*mp), GFP_KERNEL);
	if (!mp)
		goto err_out_mtd;

	mtd->priv = mp;
	mp->resource.module = mod_res;

	/* Firmware's diagnostic NVRAM area. */
	diag_res = kzalloc(sizeof(*diag_res), GFP_KERNEL);
	if (!diag_res)
		goto err_out_mp;

	diag_res->name = ms02nv_res_diag_ram;
	diag_res->start = addr;
	diag_res->end = addr + MS02NV_RAM - 1;
	diag_res->flags = IORESOURCE_BUSY;
	request_resource(mod_res, diag_res);

	mp->resource.diag_ram = diag_res;

	/* User-available general-purpose NVRAM area. */
	user_res = kzalloc(sizeof(*user_res), GFP_KERNEL);
	if (!user_res)
		goto err_out_diag_res;

	user_res->name = ms02nv_res_user_ram;
	user_res->start = addr + MS02NV_RAM;
	user_res->end = addr + size - 1;
	user_res->flags = IORESOURCE_BUSY;
	request_resource(mod_res, user_res);

	mp->resource.user_ram = user_res;

	/* Control and status register. */
	csr_res = kzalloc(sizeof(*csr_res), GFP_KERNEL);
	if (!csr_res)
		goto err_out_user_res;

	csr_res->name = ms02nv_res_csr;
	csr_res->start = addr + MS02NV_CSR;
	csr_res->end = addr + MS02NV_CSR + 3;
	csr_res->flags = IORESOURCE_BUSY;
	request_resource(mod_res, csr_res);

	mp->resource.csr = csr_res;

	mp->addr = phys_to_virt(addr);
	mp->size = size;

	/*
	 * Hide the firmware's diagnostic area.  It may get destroyed
	 * upon a reboot.  Take paging into account for mapping support.
	 */
	fixaddr = (addr + MS02NV_RAM + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1);
	fixsize = (size - (fixaddr - addr)) & ~(PAGE_SIZE - 1);
	mp->uaddr = phys_to_virt(fixaddr);

	mtd->type = MTD_RAM;
	mtd->flags = MTD_CAP_RAM;
	mtd->size = fixsize;
	mtd->name = (char *)ms02nv_name;
	mtd->owner = THIS_MODULE;
	mtd->read = ms02nv_read;
	mtd->write = ms02nv_write;
	mtd->writesize = 1;

	ret = -EIO;
	if (add_mtd_device(mtd)) {
		printk(KERN_ERR
			"ms02-nv: Unable to register MTD device, aborting!\n");
		goto err_out_csr_res;
	}

	printk(KERN_INFO "mtd%d: %s at 0x%08lx, size %zuMiB.\n",
		mtd->index, ms02nv_name, addr, size >> 20);

	mp->next = root_ms02nv_mtd;
	root_ms02nv_mtd = mtd;

	return 0;


err_out_csr_res:
	release_resource(csr_res);
	kfree(csr_res);
err_out_user_res:
	release_resource(user_res);
	kfree(user_res);
err_out_diag_res:
	release_resource(diag_res);
	kfree(diag_res);
err_out_mp:
	kfree(mp);
err_out_mtd:
	kfree(mtd);
err_out_mod_res_rel:
	release_resource(mod_res);
err_out_mod_res:
	kfree(mod_res);
	return ret;
}

static void __exit ms02nv_remove_one(void)
{
	struct mtd_info *mtd = root_ms02nv_mtd;
	struct ms02nv_private *mp = mtd->priv;

	root_ms02nv_mtd = mp->next;

	del_mtd_device(mtd);

	release_resource(mp->resource.csr);
	kfree(mp->resource.csr);
	release_resource(mp->resource.user_ram);
	kfree(mp->resource.user_ram);
	release_resource(mp->resource.diag_ram);
	kfree(mp->resource.diag_ram);
	release_resource(mp->resource.module);
	kfree(mp->resource.module);
	kfree(mp);
	kfree(mtd);
}


static int __init ms02nv_init(void)
{
	volatile u32 *csr;
	uint stride = 0;
	int count = 0;
	int i;

	switch (mips_machtype) {
	case MACH_DS5000_200:
		csr = (volatile u32 *)CKSEG1ADDR(KN02_SLOT_BASE + KN02_CSR);
		if (*csr & KN02_CSR_BNK32M)
			stride = 2;
		break;
	case MACH_DS5000_2X0:
	case MACH_DS5900:
		csr = (volatile u32 *)CKSEG1ADDR(KN03_SLOT_BASE + IOASIC_MCR);
		if (*csr & KN03_MCR_BNK32M)
			stride = 2;
		break;
	default:
		return -ENODEV;
		break;
	}

	for (i = 0; i < ARRAY_SIZE(ms02nv_addrs); i++)
		if (!ms02nv_init_one(ms02nv_addrs[i] << stride))
			count++;

	return (count > 0) ? 0 : -ENODEV;
}

static void __exit ms02nv_cleanup(void)
{
	while (root_ms02nv_mtd)
		ms02nv_remove_one();
}


module_init(ms02nv_init);
module_exit(ms02nv_cleanup);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright (c) 2001 Maciej W. Rozycki
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version
	7	* 2 of the License, or (at your option) any later version.
1da177e4 LT	8	*/
	9
	10	#include <linux/init.h>
	11	#include <linux/ioport.h>
	12	#include <linux/kernel.h>
	13	#include <linux/module.h>
	14	#include <linux/mtd/mtd.h>
	15	#include <linux/slab.h>
	16	#include <linux/types.h>
	17
	18	#include <asm/addrspace.h>
	19	#include <asm/bootinfo.h>
	20	#include <asm/dec/ioasic_addrs.h>
	21	#include <asm/dec/kn02.h>
	22	#include <asm/dec/kn03.h>
	23	#include <asm/io.h>
	24	#include <asm/paccess.h>
	25
	26	#include "ms02-nv.h"
	27
	28
	29	static char version[] __initdata =
	30	"ms02-nv.c: v.1.0.0 13 Aug 2001 Maciej W. Rozycki.\n";
	31
	32	MODULE_AUTHOR("Maciej W. Rozycki <macro@linux-mips.org>");
	33	MODULE_DESCRIPTION("DEC MS02-NV NVRAM module driver");
	34	MODULE_LICENSE("GPL");
	35
	36
	37	/*
	38	* Addresses we probe for an MS02-NV at. Modules may be located
	39	* at any 8MiB boundary within a 0MiB up to 112MiB range or at any 32MiB
	40	* boundary within a 0MiB up to 448MiB range. We don't support a module
	41	* at 0MiB, though.
	42	*/
	43	static ulong ms02nv_addrs[] __initdata = {
	44	0x07000000, 0x06800000, 0x06000000, 0x05800000, 0x05000000,
	45	0x04800000, 0x04000000, 0x03800000, 0x03000000, 0x02800000,
	46	0x02000000, 0x01800000, 0x01000000, 0x00800000
	47	};
	48
	49	static const char ms02nv_name[] = "DEC MS02-NV NVRAM";
	50	static const char ms02nv_res_diag_ram[] = "Diagnostic RAM";
	51	static const char ms02nv_res_user_ram[] = "General-purpose RAM";
	52	static const char ms02nv_res_csr[] = "Control and status register";
	53
	54	static struct mtd_info *root_ms02nv_mtd;
	55
	56
	57	static int ms02nv_read(struct mtd_info *mtd, loff_t from,
	58	size_t len, size_t retlen, u_char buf)
	59	{
	60	struct ms02nv_private *mp = mtd->priv;
	61
	62	if (from + len > mtd->size)
	63	return -EINVAL;
	64
	65	memcpy(buf, mp->uaddr + from, len);
	66	*retlen = len;
	67
	68	return 0;
	69	}
	70
	71	static int ms02nv_write(struct mtd_info *mtd, loff_t to,
72	size_t len, size_t retlen, const u_char buf)
73	{
74	struct ms02nv_private *mp = mtd->priv;
75
76	if (to + len > mtd->size)
77	return -EINVAL;
78
79	memcpy(mp->uaddr + to, buf, len);
80	*retlen = len;
81
82	return 0;
83	}
84
85
86	static inline uint ms02nv_probe_one(ulong addr)
87	{
88	ms02nv_uint *ms02nv_diagp;
89	ms02nv_uint *ms02nv_magicp;
90	uint ms02nv_diag;
91	uint ms02nv_magic;
92	size_t size;
93
94	int err;
95
96	/*
97	* The firmware writes MS02NV_ID at MS02NV_MAGIC and also
98	* a diagnostic status at MS02NV_DIAG.
99	*/
af2c80e9	100	ms02nv_diagp = (ms02nv_uint *)(CKSEG1ADDR(addr + MS02NV_DIAG));
af2c80e9	101	ms02nv_magicp = (ms02nv_uint *)(CKSEG1ADDR(addr + MS02NV_MAGIC));
1da177e4 LT	102	err = get_dbe(ms02nv_magic, ms02nv_magicp);
	103	if (err)
	104	return 0;
	105	if (ms02nv_magic != MS02NV_ID)
	106	return 0;
	107
	108	ms02nv_diag = *ms02nv_diagp;
	109	size = (ms02nv_diag & MS02NV_DIAG_SIZE_MASK) << MS02NV_DIAG_SIZE_SHIFT;
	110	if (size > MS02NV_CSR)
	111	size = MS02NV_CSR;
	112
	113	return size;
	114	}
	115
	116	static int __init ms02nv_init_one(ulong addr)
	117	{
	118	struct mtd_info *mtd;
	119	struct ms02nv_private *mp;
	120	struct resource *mod_res;
	121	struct resource *diag_res;
	122	struct resource *user_res;
	123	struct resource *csr_res;
	124	ulong fixaddr;
	125	size_t size, fixsize;
	126
	127	static int version_printed;
	128
	129	int ret = -ENODEV;
	130
	131	/* The module decodes 8MiB of address space. */
95b93a0c	132	mod_res = kzalloc(sizeof(*mod_res), GFP_KERNEL);
1da177e4 LT	133	if (!mod_res)
	134	return -ENOMEM;
	135
1da177e4 LT	136	mod_res->name = ms02nv_name;
	137	mod_res->start = addr;
	138	mod_res->end = addr + MS02NV_SLOT_SIZE - 1;
	139	mod_res->flags = IORESOURCE_MEM \| IORESOURCE_BUSY;
	140	if (request_resource(&iomem_resource, mod_res) < 0)
	141	goto err_out_mod_res;
	142
	143	size = ms02nv_probe_one(addr);
	144	if (!size)
	145	goto err_out_mod_res_rel;
	146
	147	if (!version_printed) {
	148	printk(KERN_INFO "%s", version);
	149	version_printed = 1;
	150	}
	151
	152	ret = -ENOMEM;
95b93a0c	153	mtd = kzalloc(sizeof(*mtd), GFP_KERNEL);
1da177e4 LT	154	if (!mtd)
1da177e4 LT	155	goto err_out_mod_res_rel;
95b93a0c	156	mp = kzalloc(sizeof(*mp), GFP_KERNEL);
1da177e4 LT	157	if (!mp)
1da177e4 LT	158	goto err_out_mtd;
1da177e4 LT	159
	160	mtd->priv = mp;
	161	mp->resource.module = mod_res;
	162
	163	/* Firmware's diagnostic NVRAM area. */
95b93a0c	164	diag_res = kzalloc(sizeof(*diag_res), GFP_KERNEL);
1da177e4 LT	165	if (!diag_res)
	166	goto err_out_mp;
	167
1da177e4 LT	168	diag_res->name = ms02nv_res_diag_ram;
	169	diag_res->start = addr;
	170	diag_res->end = addr + MS02NV_RAM - 1;
	171	diag_res->flags = IORESOURCE_BUSY;
	172	request_resource(mod_res, diag_res);
	173
	174	mp->resource.diag_ram = diag_res;
	175
	176	/* User-available general-purpose NVRAM area. */
95b93a0c	177	user_res = kzalloc(sizeof(*user_res), GFP_KERNEL);
1da177e4 LT	178	if (!user_res)
	179	goto err_out_diag_res;
	180
1da177e4 LT	181	user_res->name = ms02nv_res_user_ram;
	182	user_res->start = addr + MS02NV_RAM;
	183	user_res->end = addr + size - 1;
	184	user_res->flags = IORESOURCE_BUSY;
	185	request_resource(mod_res, user_res);
	186
	187	mp->resource.user_ram = user_res;
	188
	189	/* Control and status register. */
95b93a0c	190	csr_res = kzalloc(sizeof(*csr_res), GFP_KERNEL);
1da177e4 LT	191	if (!csr_res)
	192	goto err_out_user_res;
	193
1da177e4 LT	194	csr_res->name = ms02nv_res_csr;
	195	csr_res->start = addr + MS02NV_CSR;
	196	csr_res->end = addr + MS02NV_CSR + 3;
	197	csr_res->flags = IORESOURCE_BUSY;
	198	request_resource(mod_res, csr_res);
	199
	200	mp->resource.csr = csr_res;
	201
	202	mp->addr = phys_to_virt(addr);
	203	mp->size = size;
	204
	205	/*
	206	* Hide the firmware's diagnostic area. It may get destroyed
	207	* upon a reboot. Take paging into account for mapping support.
	208	*/
	209	fixaddr = (addr + MS02NV_RAM + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1);
	210	fixsize = (size - (fixaddr - addr)) & ~(PAGE_SIZE - 1);
	211	mp->uaddr = phys_to_virt(fixaddr);
	212
21c8db9e	213	mtd->type = MTD_RAM;
e1219724	214	mtd->flags = MTD_CAP_RAM;
1da177e4 LT	215	mtd->size = fixsize;
	216	mtd->name = (char *)ms02nv_name;
	217	mtd->owner = THIS_MODULE;
	218	mtd->read = ms02nv_read;
	219	mtd->write = ms02nv_write;
17ffc7ba	220	mtd->writesize = 1;
1da177e4 LT	221
	222	ret = -EIO;
	223	if (add_mtd_device(mtd)) {
	224	printk(KERN_ERR
	225	"ms02-nv: Unable to register MTD device, aborting!\n");
	226	goto err_out_csr_res;
	227	}
	228
af2c80e9	229	printk(KERN_INFO "mtd%d: %s at 0x%08lx, size %zuMiB.\n",
1da177e4 LT	230	mtd->index, ms02nv_name, addr, size >> 20);
	231
	232	mp->next = root_ms02nv_mtd;
	233	root_ms02nv_mtd = mtd;
	234
	235	return 0;
	236
	237
	238	err_out_csr_res:
	239	release_resource(csr_res);
	240	kfree(csr_res);
	241	err_out_user_res:
	242	release_resource(user_res);
	243	kfree(user_res);
	244	err_out_diag_res:
	245	release_resource(diag_res);
	246	kfree(diag_res);
	247	err_out_mp:
	248	kfree(mp);
	249	err_out_mtd:
	250	kfree(mtd);
	251	err_out_mod_res_rel:
	252	release_resource(mod_res);
	253	err_out_mod_res:
	254	kfree(mod_res);
	255	return ret;
	256	}
	257
	258	static void __exit ms02nv_remove_one(void)
	259	{
	260	struct mtd_info *mtd = root_ms02nv_mtd;
	261	struct ms02nv_private *mp = mtd->priv;
	262
	263	root_ms02nv_mtd = mp->next;
	264
	265	del_mtd_device(mtd);
	266
	267	release_resource(mp->resource.csr);
	268	kfree(mp->resource.csr);
	269	release_resource(mp->resource.user_ram);
	270	kfree(mp->resource.user_ram);
	271	release_resource(mp->resource.diag_ram);
	272	kfree(mp->resource.diag_ram);
	273	release_resource(mp->resource.module);
	274	kfree(mp->resource.module);
	275	kfree(mp);
	276	kfree(mtd);
	277	}
	278
	279
	280	static int __init ms02nv_init(void)
	281	{
	282	volatile u32 *csr;
	283	uint stride = 0;
	284	int count = 0;
	285	int i;
	286
	287	switch (mips_machtype) {
	288	case MACH_DS5000_200:
3eb8ceac	289	csr = (volatile u32 *)CKSEG1ADDR(KN02_SLOT_BASE + KN02_CSR);
1da177e4 LT	290	if (*csr & KN02_CSR_BNK32M)
	291	stride = 2;
	292	break;
	293	case MACH_DS5000_2X0:
	294	case MACH_DS5900:
3eb8ceac	295	csr = (volatile u32 *)CKSEG1ADDR(KN03_SLOT_BASE + IOASIC_MCR);
1da177e4 LT	296	if (*csr & KN03_MCR_BNK32M)
	297	stride = 2;
	298	break;
	299	default:
	300	return -ENODEV;
	301	break;
	302	}
	303
87d10f3c	304	for (i = 0; i < ARRAY_SIZE(ms02nv_addrs); i++)
1da177e4 LT	305	if (!ms02nv_init_one(ms02nv_addrs[i] << stride))
	306	count++;
	307
	308	return (count > 0) ? 0 : -ENODEV;
	309	}
	310
	311	static void __exit ms02nv_cleanup(void)
	312	{
	313	while (root_ms02nv_mtd)
	314	ms02nv_remove_one();
	315	}
	316
	317
	318	module_init(ms02nv_init);
	319	module_exit(ms02nv_cleanup);