/* 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");
