drivers/mtd/maps/dilnetpc.c - kernel/msm-4.19 - Gitiles

 /* dilnetpc.c -- MTD map driver for SSV DIL/Net PC Boards "DNP" and "ADNP"
  *
  * 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: dilnetpc.c,v 1.20 2005/11/07 11:14:26 gleixner Exp $
  *
  * The DIL/Net PC is a tiny embedded PC board made by SSV Embedded Systems
  * featuring the AMD Elan SC410 processor. There are two variants of this
  * board: DNP/1486 and ADNP/1486. The DNP version has 2 megs of flash
  * ROM (Intel 28F016S3) and 8 megs of DRAM, the ADNP version has 4 megs
  * flash and 16 megs of RAM.
  * For details, see http://www.ssv-embedded.de/ssv/pc104/p169.htm
  * and http://www.ssv-embedded.de/ssv/pc104/p170.htm
  */

 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/string.h>

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

 #include <asm/io.h>

 /*
 ** The DIL/NetPC keeps its BIOS in two distinct flash blocks.
 ** Destroying any of these blocks transforms the DNPC into
 ** a paperweight (albeit not a very useful one, considering
 ** it only weighs a few grams).
 **
 ** Therefore, the BIOS blocks must never be erased or written to
 ** except by people who know exactly what they are doing (e.g.
 ** to install a BIOS update). These partitions are marked read-only
 ** by default, but can be made read/write by undefining
 ** DNPC_BIOS_BLOCKS_WRITEPROTECTED:
 */
 #define DNPC_BIOS_BLOCKS_WRITEPROTECTED

 /*
 ** The ID string (in ROM) is checked to determine whether we
 ** are running on a DNP/1486 or ADNP/1486
 */
 #define BIOSID_BASE	0x000fe100

 #define ID_DNPC	"DNP1486"
 #define ID_ADNP	"ADNP1486"

 /*
 ** Address where the flash should appear in CPU space
 */
 #define FLASH_BASE	0x2000000

 /*
 ** Chip Setup and Control (CSC) indexed register space
 */
 #define CSC_INDEX	0x22
 #define CSC_DATA	0x23

 #define CSC_MMSWAR	0x30	/* MMS window C-F attributes register */
 #define CSC_MMSWDSR	0x31	/* MMS window C-F device select register */

 #define CSC_RBWR	0xa7	/* GPIO Read-Back/Write Register B */

 #define CSC_CR		0xd0	/* internal I/O device disable/Echo */
 				/* Z-bus/configuration register */

 #define CSC_PCCMDCR	0xf1	/* PC card mode and DMA control register */


 /*
 ** PC Card indexed register space:
 */

 #define PCC_INDEX	0x3e0
 #define PCC_DATA	0x3e1

 #define PCC_AWER_B		0x46	/* Socket B Address Window enable register */
 #define PCC_MWSAR_1_Lo	0x58	/* memory window 1 start address low register */
 #define PCC_MWSAR_1_Hi	0x59	/* memory window 1 start address high register */
 #define PCC_MWEAR_1_Lo	0x5A	/* memory window 1 stop address low register */
 #define PCC_MWEAR_1_Hi	0x5B	/* memory window 1 stop address high register */
 #define PCC_MWAOR_1_Lo	0x5C	/* memory window 1 address offset low register */
 #define PCC_MWAOR_1_Hi	0x5D	/* memory window 1 address offset high register */


 /*
 ** Access to SC4x0's Chip Setup and Control (CSC)
 ** and PC Card (PCC) indexed registers:
 */
 static inline void setcsc(int reg, unsigned char data)
 {
 	outb(reg, CSC_INDEX);
 	outb(data, CSC_DATA);
 }

 static inline unsigned char getcsc(int reg)
 {
 	outb(reg, CSC_INDEX);
 	return(inb(CSC_DATA));
 }

 static inline void setpcc(int reg, unsigned char data)
 {
 	outb(reg, PCC_INDEX);
 	outb(data, PCC_DATA);
 }

 static inline unsigned char getpcc(int reg)
 {
 	outb(reg, PCC_INDEX);
 	return(inb(PCC_DATA));
 }


 /*
 ************************************************************
 ** Enable access to DIL/NetPC's flash by mapping it into
 ** the SC4x0's MMS Window C.
 ************************************************************
 */
 static void dnpc_map_flash(unsigned long flash_base, unsigned long flash_size)
 {
 	unsigned long flash_end = flash_base + flash_size - 1;

 	/*
 	** enable setup of MMS windows C-F:
 	*/
 	/* - enable PC Card indexed register space */
 	setcsc(CSC_CR, getcsc(CSC_CR) | 0x2);
 	/* - set PC Card controller to operate in standard mode */
 	setcsc(CSC_PCCMDCR, getcsc(CSC_PCCMDCR) & ~1);

 	/*
 	** Program base address and end address of window
 	** where the flash ROM should appear in CPU address space
 	*/
 	setpcc(PCC_MWSAR_1_Lo, (flash_base >> 12) & 0xff);
 	setpcc(PCC_MWSAR_1_Hi, (flash_base >> 20) & 0x3f);
 	setpcc(PCC_MWEAR_1_Lo, (flash_end >> 12) & 0xff);
 	setpcc(PCC_MWEAR_1_Hi, (flash_end >> 20) & 0x3f);

 	/* program offset of first flash location to appear in this window (0) */
 	setpcc(PCC_MWAOR_1_Lo, ((0 - flash_base) >> 12) & 0xff);
 	setpcc(PCC_MWAOR_1_Hi, ((0 - flash_base)>> 20) & 0x3f);

 	/* set attributes for MMS window C: non-cacheable, write-enabled */
 	setcsc(CSC_MMSWAR, getcsc(CSC_MMSWAR) & ~0x11);

 	/* select physical device ROMCS0 (i.e. flash) for MMS Window C */
 	setcsc(CSC_MMSWDSR, getcsc(CSC_MMSWDSR) & ~0x03);

 	/* enable memory window 1 */
 	setpcc(PCC_AWER_B, getpcc(PCC_AWER_B) | 0x02);

 	/* now disable PC Card indexed register space again */
 	setcsc(CSC_CR, getcsc(CSC_CR) & ~0x2);
 }


 /*
 ************************************************************
 ** Disable access to DIL/NetPC's flash by mapping it into
 ** the SC4x0's MMS Window C.
 ************************************************************
 */
 static void dnpc_unmap_flash(void)
 {
 	/* - enable PC Card indexed register space */
 	setcsc(CSC_CR, getcsc(CSC_CR) | 0x2);

 	/* disable memory window 1 */
 	setpcc(PCC_AWER_B, getpcc(PCC_AWER_B) & ~0x02);

 	/* now disable PC Card indexed register space again */
 	setcsc(CSC_CR, getcsc(CSC_CR) & ~0x2);
 }


 /*
 ************************************************************
 ** Enable/Disable VPP to write to flash
 ************************************************************
 */

 static DEFINE_SPINLOCK(dnpc_spin);
 static int        vpp_counter = 0;
 /*
 ** This is what has to be done for the DNP board ..
 */
 static void dnp_set_vpp(struct map_info *not_used, int on)
 {
 	spin_lock_irq(&dnpc_spin);

 	if (on)
 	{
 		if(++vpp_counter == 1)
 			setcsc(CSC_RBWR, getcsc(CSC_RBWR) & ~0x4);
 	}
 	else
 	{
 		if(--vpp_counter == 0)
 			setcsc(CSC_RBWR, getcsc(CSC_RBWR) | 0x4);
 		else
 			BUG_ON(vpp_counter < 0);
 	}
 	spin_unlock_irq(&dnpc_spin);
 }

 /*
 ** .. and this the ADNP version:
 */
 static void adnp_set_vpp(struct map_info *not_used, int on)
 {
 	spin_lock_irq(&dnpc_spin);

 	if (on)
 	{
 		if(++vpp_counter == 1)
 			setcsc(CSC_RBWR, getcsc(CSC_RBWR) & ~0x8);
 	}
 	else
 	{
 		if(--vpp_counter == 0)
 			setcsc(CSC_RBWR, getcsc(CSC_RBWR) | 0x8);
 		else
 			BUG_ON(vpp_counter < 0);
 	}
 	spin_unlock_irq(&dnpc_spin);
 }


 #define DNP_WINDOW_SIZE		0x00200000	/*  DNP flash size is 2MiB  */
 #define ADNP_WINDOW_SIZE	0x00400000	/* ADNP flash size is 4MiB */
 #define WINDOW_ADDR		FLASH_BASE

 static struct map_info dnpc_map = {
 	.name = "ADNP Flash Bank",
 	.size = ADNP_WINDOW_SIZE,
 	.bankwidth = 1,
 	.set_vpp = adnp_set_vpp,
 	.phys = WINDOW_ADDR
 };

 /*
 ** The layout of the flash is somewhat "strange":
 **
 ** 1.  960 KiB (15 blocks) : Space for ROM Bootloader and user data
 ** 2.   64 KiB (1 block)   : System BIOS
 ** 3.  960 KiB (15 blocks) : User Data (DNP model) or
 ** 3. 3008 KiB (47 blocks) : User Data (ADNP model)
 ** 4.   64 KiB (1 block)   : System BIOS Entry
 */

 static struct mtd_partition partition_info[]=
 {
 	{
 		.name =		"ADNP boot",
 		.offset =	0,
 		.size =		0xf0000,
 	},
 	{
 		.name =		"ADNP system BIOS",
 		.offset =	MTDPART_OFS_NXTBLK,
 		.size =		0x10000,
 #ifdef DNPC_BIOS_BLOCKS_WRITEPROTECTED
 		.mask_flags =	MTD_WRITEABLE,
 #endif
 	},
 	{
 		.name =		"ADNP file system",
 		.offset =	MTDPART_OFS_NXTBLK,
 		.size =		0x2f0000,
 	},
 	{
 		.name =		"ADNP system BIOS entry",
 		.offset =	MTDPART_OFS_NXTBLK,
 		.size =		MTDPART_SIZ_FULL,
 #ifdef DNPC_BIOS_BLOCKS_WRITEPROTECTED
 		.mask_flags =	MTD_WRITEABLE,
 #endif
 	},
 };

 #define NUM_PARTITIONS ARRAY_SIZE(partition_info)

 static struct mtd_info *mymtd;
 static struct mtd_info *lowlvl_parts[NUM_PARTITIONS];
 static struct mtd_info *merged_mtd;

 /*
 ** "Highlevel" partition info:
 **
 ** Using the MTD concat layer, we can re-arrange partitions to our
 ** liking: we construct a virtual MTD device by concatenating the
 ** partitions, specifying the sequence such that the boot block
 ** is immediately followed by the filesystem block (i.e. the stupid
 ** system BIOS block is mapped to a different place). When re-partitioning
 ** this concatenated MTD device, we can set the boot block size to
 ** an arbitrary (though erase block aligned) value i.e. not one that
 ** is dictated by the flash's physical layout. We can thus set the
 ** boot block to be e.g. 64 KB (which is fully sufficient if we want
 ** to boot an etherboot image) or to -say- 1.5 MB if we want to boot
 ** a large kernel image. In all cases, the remainder of the flash
 ** is available as file system space.
 */

 static struct mtd_partition higlvl_partition_info[]=
 {
 	{
 		.name =		"ADNP boot block",
 		.offset =	0,
 		.size =		CONFIG_MTD_DILNETPC_BOOTSIZE,
 	},
 	{
 		.name =		"ADNP file system space",
 		.offset =	MTDPART_OFS_NXTBLK,
 		.size =		ADNP_WINDOW_SIZE-CONFIG_MTD_DILNETPC_BOOTSIZE-0x20000,
 	},
 	{
 		.name =		"ADNP system BIOS + BIOS Entry",
 		.offset =	MTDPART_OFS_NXTBLK,
 		.size =		MTDPART_SIZ_FULL,
 #ifdef DNPC_BIOS_BLOCKS_WRITEPROTECTED
 		.mask_flags =	MTD_WRITEABLE,
 #endif
 	},
 };

 #define NUM_HIGHLVL_PARTITIONS ARRAY_SIZE(higlvl_partition_info)


 static int dnp_adnp_probe(void)
 {
 	char *biosid, rc = -1;

 	biosid = (char*)ioremap(BIOSID_BASE, 16);
 	if(biosid)
 	{
 		if(!strcmp(biosid, ID_DNPC))
 			rc = 1;		/* this is a DNPC  */
 		else if(!strcmp(biosid, ID_ADNP))
 			rc = 0;		/* this is a ADNPC */
 	}
 	iounmap((void *)biosid);
 	return(rc);
 }


 static int __init init_dnpc(void)
 {
 	int is_dnp;

 	/*
 	** determine hardware (DNP/ADNP/invalid)
 	*/
 	if((is_dnp = dnp_adnp_probe()) < 0)
 		return -ENXIO;

 	/*
 	** Things are set up for ADNP by default
 	** -> modify all that needs to be different for DNP
 	*/
 	if(is_dnp)
 	{	/*
 		** Adjust window size, select correct set_vpp function.
 		** The partitioning scheme is identical on both DNP
 		** and ADNP except for the size of the third partition.
 		*/
 		int i;
 		dnpc_map.size          = DNP_WINDOW_SIZE;
 		dnpc_map.set_vpp       = dnp_set_vpp;
 		partition_info[2].size = 0xf0000;

 		/*
 		** increment all string pointers so the leading 'A' gets skipped,
 		** thus turning all occurrences of "ADNP ..." into "DNP ..."
 		*/
 		++dnpc_map.name;
 		for(i = 0; i < NUM_PARTITIONS; i++)
 			++partition_info[i].name;
 		higlvl_partition_info[1].size = DNP_WINDOW_SIZE -
 			CONFIG_MTD_DILNETPC_BOOTSIZE - 0x20000;
 		for(i = 0; i < NUM_HIGHLVL_PARTITIONS; i++)
 			++higlvl_partition_info[i].name;
 	}

 	printk(KERN_NOTICE "DIL/Net %s flash: 0x%lx at 0x%lx\n",
 		is_dnp ? "DNPC" : "ADNP", dnpc_map.size, dnpc_map.phys);

 	dnpc_map.virt = ioremap_nocache(dnpc_map.phys, dnpc_map.size);

 	dnpc_map_flash(dnpc_map.phys, dnpc_map.size);

 	if (!dnpc_map.virt) {
 		printk("Failed to ioremap_nocache\n");
 		return -EIO;
 	}
 	simple_map_init(&dnpc_map);

 	printk("FLASH virtual address: 0x%p\n", dnpc_map.virt);

 	mymtd = do_map_probe("jedec_probe", &dnpc_map);

 	if (!mymtd)
 		mymtd = do_map_probe("cfi_probe", &dnpc_map);

 	/*
 	** If flash probes fail, try to make flashes accessible
 	** at least as ROM. Ajust erasesize in this case since
 	** the default one (128M) will break our partitioning
 	*/
 	if (!mymtd)
 		if((mymtd = do_map_probe("map_rom", &dnpc_map)))
 			mymtd->erasesize = 0x10000;

 	if (!mymtd) {
 		iounmap(dnpc_map.virt);
 		return -ENXIO;
 	}

 	mymtd->owner = THIS_MODULE;

 	/*
 	** Supply pointers to lowlvl_parts[] array to add_mtd_partitions()
 	** -> add_mtd_partitions() will _not_ register MTD devices for
 	** the partitions, but will instead store pointers to the MTD
 	** objects it creates into our lowlvl_parts[] array.
 	** NOTE: we arrange the pointers such that the sequence of the
 	**       partitions gets re-arranged: partition #2 follows
 	**       partition #0.
 	*/
 	partition_info[0].mtdp = &lowlvl_parts[0];
 	partition_info[1].mtdp = &lowlvl_parts[2];
 	partition_info[2].mtdp = &lowlvl_parts[1];
 	partition_info[3].mtdp = &lowlvl_parts[3];

 	add_mtd_partitions(mymtd, partition_info, NUM_PARTITIONS);

 	/*
 	** now create a virtual MTD device by concatenating the for partitions
 	** (in the sequence given by the lowlvl_parts[] array.
 	*/
 	merged_mtd = mtd_concat_create(lowlvl_parts, NUM_PARTITIONS, "(A)DNP Flash Concatenated");
 	if(merged_mtd)
 	{	/*
 		** now partition the new device the way we want it. This time,
 		** we do not supply mtd pointers in higlvl_partition_info, so
 		** add_mtd_partitions() will register the devices.
 		*/
 		add_mtd_partitions(merged_mtd, higlvl_partition_info, NUM_HIGHLVL_PARTITIONS);
 	}

 	return 0;
 }

 static void __exit cleanup_dnpc(void)
 {
 	if(merged_mtd) {
 		del_mtd_partitions(merged_mtd);
 		mtd_concat_destroy(merged_mtd);
 	}

 	if (mymtd) {
 		del_mtd_partitions(mymtd);
 		map_destroy(mymtd);
 	}
 	if (dnpc_map.virt) {
 		iounmap(dnpc_map.virt);
 		dnpc_unmap_flash();
 		dnpc_map.virt = NULL;
 	}
 }

 module_init(init_dnpc);
 module_exit(cleanup_dnpc);

 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Sysgo Real-Time Solutions GmbH");
 MODULE_DESCRIPTION("MTD map driver for SSV DIL/NetPC DNP & ADNP");
	/* dilnetpc.c -- MTD map driver for SSV DIL/Net PC Boards "DNP" and "ADNP"
	*
	* 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: dilnetpc.c,v 1.20 2005/11/07 11:14:26 gleixner Exp $
	*
	* The DIL/Net PC is a tiny embedded PC board made by SSV Embedded Systems
	* featuring the AMD Elan SC410 processor. There are two variants of this
	* board: DNP/1486 and ADNP/1486. The DNP version has 2 megs of flash
	* ROM (Intel 28F016S3) and 8 megs of DRAM, the ADNP version has 4 megs
	* flash and 16 megs of RAM.
	* For details, see http://www.ssv-embedded.de/ssv/pc104/p169.htm
	* and http://www.ssv-embedded.de/ssv/pc104/p170.htm
	*/

	#include <linux/module.h>
	#include <linux/types.h>
	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/string.h>

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

	#include <asm/io.h>

	/*
	** The DIL/NetPC keeps its BIOS in two distinct flash blocks.
	** Destroying any of these blocks transforms the DNPC into
	** a paperweight (albeit not a very useful one, considering
	** it only weighs a few grams).
	**
	** Therefore, the BIOS blocks must never be erased or written to
	** except by people who know exactly what they are doing (e.g.
	** to install a BIOS update). These partitions are marked read-only
	** by default, but can be made read/write by undefining
	** DNPC_BIOS_BLOCKS_WRITEPROTECTED:
	*/
	#define DNPC_BIOS_BLOCKS_WRITEPROTECTED

	/*
	** The ID string (in ROM) is checked to determine whether we
	** are running on a DNP/1486 or ADNP/1486
	*/
	#define BIOSID_BASE 0x000fe100

	#define ID_DNPC "DNP1486"
	#define ID_ADNP "ADNP1486"

	/*
	** Address where the flash should appear in CPU space
	*/
	#define FLASH_BASE 0x2000000

	/*
	** Chip Setup and Control (CSC) indexed register space
	*/
	#define CSC_INDEX 0x22
	#define CSC_DATA 0x23

	#define CSC_MMSWAR 0x30 /* MMS window C-F attributes register */
	#define CSC_MMSWDSR 0x31 /* MMS window C-F device select register */

	#define CSC_RBWR 0xa7 /* GPIO Read-Back/Write Register B */

	#define CSC_CR 0xd0 /* internal I/O device disable/Echo */
	/* Z-bus/configuration register */

	#define CSC_PCCMDCR 0xf1 /* PC card mode and DMA control register */


	/*
	** PC Card indexed register space:
	*/

	#define PCC_INDEX 0x3e0
	#define PCC_DATA 0x3e1

	#define PCC_AWER_B 0x46 /* Socket B Address Window enable register */
	#define PCC_MWSAR_1_Lo 0x58 /* memory window 1 start address low register */
	#define PCC_MWSAR_1_Hi 0x59 /* memory window 1 start address high register */
	#define PCC_MWEAR_1_Lo 0x5A /* memory window 1 stop address low register */
	#define PCC_MWEAR_1_Hi 0x5B /* memory window 1 stop address high register */
	#define PCC_MWAOR_1_Lo 0x5C /* memory window 1 address offset low register */
	#define PCC_MWAOR_1_Hi 0x5D /* memory window 1 address offset high register */


	/*
	** Access to SC4x0's Chip Setup and Control (CSC)
	** and PC Card (PCC) indexed registers:
	*/
	static inline void setcsc(int reg, unsigned char data)
	{
	outb(reg, CSC_INDEX);
	outb(data, CSC_DATA);
	}

	static inline unsigned char getcsc(int reg)
	{
	outb(reg, CSC_INDEX);
	return(inb(CSC_DATA));
	}

	static inline void setpcc(int reg, unsigned char data)
	{
	outb(reg, PCC_INDEX);
	outb(data, PCC_DATA);
	}

	static inline unsigned char getpcc(int reg)
	{
	outb(reg, PCC_INDEX);
	return(inb(PCC_DATA));
	}


	/*
	************************************************************
	** Enable access to DIL/NetPC's flash by mapping it into
	** the SC4x0's MMS Window C.
	************************************************************
	*/
	static void dnpc_map_flash(unsigned long flash_base, unsigned long flash_size)
	{
	unsigned long flash_end = flash_base + flash_size - 1;

	/*
	** enable setup of MMS windows C-F:
	*/
	/* - enable PC Card indexed register space */
	setcsc(CSC_CR, getcsc(CSC_CR) \| 0x2);
	/* - set PC Card controller to operate in standard mode */
	setcsc(CSC_PCCMDCR, getcsc(CSC_PCCMDCR) & ~1);

	/*
	** Program base address and end address of window
	** where the flash ROM should appear in CPU address space
	*/
	setpcc(PCC_MWSAR_1_Lo, (flash_base >> 12) & 0xff);
	setpcc(PCC_MWSAR_1_Hi, (flash_base >> 20) & 0x3f);
	setpcc(PCC_MWEAR_1_Lo, (flash_end >> 12) & 0xff);
	setpcc(PCC_MWEAR_1_Hi, (flash_end >> 20) & 0x3f);

	/* program offset of first flash location to appear in this window (0) */
	setpcc(PCC_MWAOR_1_Lo, ((0 - flash_base) >> 12) & 0xff);
	setpcc(PCC_MWAOR_1_Hi, ((0 - flash_base)>> 20) & 0x3f);

	/* set attributes for MMS window C: non-cacheable, write-enabled */
	setcsc(CSC_MMSWAR, getcsc(CSC_MMSWAR) & ~0x11);

	/* select physical device ROMCS0 (i.e. flash) for MMS Window C */
	setcsc(CSC_MMSWDSR, getcsc(CSC_MMSWDSR) & ~0x03);

	/* enable memory window 1 */
	setpcc(PCC_AWER_B, getpcc(PCC_AWER_B) \| 0x02);

	/* now disable PC Card indexed register space again */
	setcsc(CSC_CR, getcsc(CSC_CR) & ~0x2);
	}


	/*
	************************************************************
	** Disable access to DIL/NetPC's flash by mapping it into
	** the SC4x0's MMS Window C.
	************************************************************
	*/
	static void dnpc_unmap_flash(void)
	{
	/* - enable PC Card indexed register space */
	setcsc(CSC_CR, getcsc(CSC_CR) \| 0x2);

	/* disable memory window 1 */
	setpcc(PCC_AWER_B, getpcc(PCC_AWER_B) & ~0x02);

	/* now disable PC Card indexed register space again */
	setcsc(CSC_CR, getcsc(CSC_CR) & ~0x2);
	}



	/*
	************************************************************
	** Enable/Disable VPP to write to flash
	************************************************************
	*/

	static DEFINE_SPINLOCK(dnpc_spin);
	static int vpp_counter = 0;
	/*
	** This is what has to be done for the DNP board ..
	*/
	static void dnp_set_vpp(struct map_info *not_used, int on)
	{
	spin_lock_irq(&dnpc_spin);

	if (on)
	{
	if(++vpp_counter == 1)
	setcsc(CSC_RBWR, getcsc(CSC_RBWR) & ~0x4);
	}
	else
	{
	if(--vpp_counter == 0)
	setcsc(CSC_RBWR, getcsc(CSC_RBWR) \| 0x4);
	else
	BUG_ON(vpp_counter < 0);
	}
	spin_unlock_irq(&dnpc_spin);
	}

	/*
	** .. and this the ADNP version:
	*/
	static void adnp_set_vpp(struct map_info *not_used, int on)
	{
	spin_lock_irq(&dnpc_spin);

	if (on)
	{
	if(++vpp_counter == 1)
	setcsc(CSC_RBWR, getcsc(CSC_RBWR) & ~0x8);
	}
	else
	{
	if(--vpp_counter == 0)
	setcsc(CSC_RBWR, getcsc(CSC_RBWR) \| 0x8);
	else
	BUG_ON(vpp_counter < 0);
	}
	spin_unlock_irq(&dnpc_spin);
	}



	#define DNP_WINDOW_SIZE 0x00200000 /* DNP flash size is 2MiB */
	#define ADNP_WINDOW_SIZE 0x00400000 /* ADNP flash size is 4MiB */
	#define WINDOW_ADDR FLASH_BASE

	static struct map_info dnpc_map = {
	.name = "ADNP Flash Bank",
	.size = ADNP_WINDOW_SIZE,
	.bankwidth = 1,
	.set_vpp = adnp_set_vpp,
	.phys = WINDOW_ADDR
	};

	/*
	** The layout of the flash is somewhat "strange":
	**
	** 1. 960 KiB (15 blocks) : Space for ROM Bootloader and user data
	** 2. 64 KiB (1 block) : System BIOS
	** 3. 960 KiB (15 blocks) : User Data (DNP model) or
	** 3. 3008 KiB (47 blocks) : User Data (ADNP model)
	** 4. 64 KiB (1 block) : System BIOS Entry
	*/

	static struct mtd_partition partition_info[]=
	{
	{
	.name = "ADNP boot",
	.offset = 0,
	.size = 0xf0000,
	},
	{
	.name = "ADNP system BIOS",
	.offset = MTDPART_OFS_NXTBLK,
	.size = 0x10000,
	#ifdef DNPC_BIOS_BLOCKS_WRITEPROTECTED
	.mask_flags = MTD_WRITEABLE,
	#endif
	},
	{
	.name = "ADNP file system",
	.offset = MTDPART_OFS_NXTBLK,
	.size = 0x2f0000,
	},
	{
	.name = "ADNP system BIOS entry",
	.offset = MTDPART_OFS_NXTBLK,
	.size = MTDPART_SIZ_FULL,
	#ifdef DNPC_BIOS_BLOCKS_WRITEPROTECTED
	.mask_flags = MTD_WRITEABLE,
	#endif
	},
	};

	#define NUM_PARTITIONS ARRAY_SIZE(partition_info)

	static struct mtd_info *mymtd;
	static struct mtd_info *lowlvl_parts[NUM_PARTITIONS];
	static struct mtd_info *merged_mtd;

	/*
	** "Highlevel" partition info:
	**
	** Using the MTD concat layer, we can re-arrange partitions to our
	** liking: we construct a virtual MTD device by concatenating the
	** partitions, specifying the sequence such that the boot block
	** is immediately followed by the filesystem block (i.e. the stupid
	** system BIOS block is mapped to a different place). When re-partitioning
	** this concatenated MTD device, we can set the boot block size to
	** an arbitrary (though erase block aligned) value i.e. not one that
	** is dictated by the flash's physical layout. We can thus set the
	** boot block to be e.g. 64 KB (which is fully sufficient if we want
	** to boot an etherboot image) or to -say- 1.5 MB if we want to boot
	** a large kernel image. In all cases, the remainder of the flash
	** is available as file system space.
	*/

	static struct mtd_partition higlvl_partition_info[]=
	{
	{
	.name = "ADNP boot block",
	.offset = 0,
	.size = CONFIG_MTD_DILNETPC_BOOTSIZE,
	},
	{
	.name = "ADNP file system space",
	.offset = MTDPART_OFS_NXTBLK,
	.size = ADNP_WINDOW_SIZE-CONFIG_MTD_DILNETPC_BOOTSIZE-0x20000,
	},
	{
	.name = "ADNP system BIOS + BIOS Entry",
	.offset = MTDPART_OFS_NXTBLK,
	.size = MTDPART_SIZ_FULL,
	#ifdef DNPC_BIOS_BLOCKS_WRITEPROTECTED
	.mask_flags = MTD_WRITEABLE,
	#endif
	},
	};

	#define NUM_HIGHLVL_PARTITIONS ARRAY_SIZE(higlvl_partition_info)


	static int dnp_adnp_probe(void)
	{
	char *biosid, rc = -1;

	biosid = (char*)ioremap(BIOSID_BASE, 16);
	if(biosid)
	{
	if(!strcmp(biosid, ID_DNPC))
	rc = 1; /* this is a DNPC */
	else if(!strcmp(biosid, ID_ADNP))
	rc = 0; /* this is a ADNPC */
	}
	iounmap((void *)biosid);
	return(rc);
	}


	static int __init init_dnpc(void)
	{
	int is_dnp;

	/*
	** determine hardware (DNP/ADNP/invalid)
	*/
	if((is_dnp = dnp_adnp_probe()) < 0)
	return -ENXIO;

	/*
	** Things are set up for ADNP by default
	** -> modify all that needs to be different for DNP
	*/
	if(is_dnp)
	{ /*
	** Adjust window size, select correct set_vpp function.
	** The partitioning scheme is identical on both DNP
	** and ADNP except for the size of the third partition.
	*/
	int i;
	dnpc_map.size = DNP_WINDOW_SIZE;
	dnpc_map.set_vpp = dnp_set_vpp;
	partition_info[2].size = 0xf0000;

	/*
	** increment all string pointers so the leading 'A' gets skipped,
	** thus turning all occurrences of "ADNP ..." into "DNP ..."
	*/
	++dnpc_map.name;
	for(i = 0; i < NUM_PARTITIONS; i++)
	++partition_info[i].name;
	higlvl_partition_info[1].size = DNP_WINDOW_SIZE -
	CONFIG_MTD_DILNETPC_BOOTSIZE - 0x20000;
	for(i = 0; i < NUM_HIGHLVL_PARTITIONS; i++)
	++higlvl_partition_info[i].name;
	}

	printk(KERN_NOTICE "DIL/Net %s flash: 0x%lx at 0x%lx\n",
	is_dnp ? "DNPC" : "ADNP", dnpc_map.size, dnpc_map.phys);

	dnpc_map.virt = ioremap_nocache(dnpc_map.phys, dnpc_map.size);

	dnpc_map_flash(dnpc_map.phys, dnpc_map.size);

	if (!dnpc_map.virt) {
	printk("Failed to ioremap_nocache\n");
	return -EIO;
	}
	simple_map_init(&dnpc_map);

	printk("FLASH virtual address: 0x%p\n", dnpc_map.virt);

	mymtd = do_map_probe("jedec_probe", &dnpc_map);

	if (!mymtd)
	mymtd = do_map_probe("cfi_probe", &dnpc_map);

	/*
	** If flash probes fail, try to make flashes accessible
	** at least as ROM. Ajust erasesize in this case since
	** the default one (128M) will break our partitioning
	*/
	if (!mymtd)
	if((mymtd = do_map_probe("map_rom", &dnpc_map)))
	mymtd->erasesize = 0x10000;

	if (!mymtd) {
	iounmap(dnpc_map.virt);
	return -ENXIO;
	}

	mymtd->owner = THIS_MODULE;

	/*
	** Supply pointers to lowlvl_parts[] array to add_mtd_partitions()
	** -> add_mtd_partitions() will _not_ register MTD devices for
	** the partitions, but will instead store pointers to the MTD
	** objects it creates into our lowlvl_parts[] array.
	** NOTE: we arrange the pointers such that the sequence of the
	** partitions gets re-arranged: partition #2 follows
	** partition #0.
	*/
	partition_info[0].mtdp = &lowlvl_parts[0];
	partition_info[1].mtdp = &lowlvl_parts[2];
	partition_info[2].mtdp = &lowlvl_parts[1];
	partition_info[3].mtdp = &lowlvl_parts[3];

	add_mtd_partitions(mymtd, partition_info, NUM_PARTITIONS);

	/*
	** now create a virtual MTD device by concatenating the for partitions
	** (in the sequence given by the lowlvl_parts[] array.
	*/
	merged_mtd = mtd_concat_create(lowlvl_parts, NUM_PARTITIONS, "(A)DNP Flash Concatenated");
	if(merged_mtd)
	{ /*
	** now partition the new device the way we want it. This time,
	** we do not supply mtd pointers in higlvl_partition_info, so
	** add_mtd_partitions() will register the devices.
	*/
	add_mtd_partitions(merged_mtd, higlvl_partition_info, NUM_HIGHLVL_PARTITIONS);
	}

	return 0;
	}

	static void __exit cleanup_dnpc(void)
	{
	if(merged_mtd) {
	del_mtd_partitions(merged_mtd);
	mtd_concat_destroy(merged_mtd);
	}

	if (mymtd) {
	del_mtd_partitions(mymtd);
	map_destroy(mymtd);
	}
	if (dnpc_map.virt) {
	iounmap(dnpc_map.virt);
	dnpc_unmap_flash();
	dnpc_map.virt = NULL;
	}
	}

	module_init(init_dnpc);
	module_exit(cleanup_dnpc);

	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Sysgo Real-Time Solutions GmbH");
	MODULE_DESCRIPTION("MTD map driver for SSV DIL/NetPC DNP & ADNP");