/* 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%llx\n", is_dnp ? "DNPC" : "ADNP", dnpc_map.size, (unsigned long long)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");