1 /* dilnetpc.c -- MTD map driver for SSV DIL/Net PC Boards "DNP" and "ADNP"
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2 of the License, or
6 * (at your option) any later version.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
17 * $Id: dilnetpc.c,v 1.8 2002/03/12 13:07:26 rkaiser Exp $
19 * The DIL/Net PC is a tiny embedded PC board made by SSV Embedded Systems
20 * featuring the AMD Elan SC410 processor. There are two variants of this
21 * board: DNP/1486 and ADNP/1486. The DNP version has 2 megs of flash
22 * ROM (Intel 28F016S3) and 8 megs of DRAM, the ADNP version has 4 megs
23 * flash and 16 megs of RAM.
24 * For details, see http://www.ssv-embedded.de/ssv/pc104/p169.htm
25 * and http://www.ssv-embedded.de/ssv/pc104/p170.htm
28 #include <linux/config.h>
29 #include <linux/module.h>
30 #include <linux/types.h>
31 #include <linux/kernel.h>
33 #include <linux/mtd/mtd.h>
34 #include <linux/mtd/map.h>
35 #include <linux/mtd/partitions.h>
36 #include <linux/mtd/concat.h>
39 ** The DIL/NetPC keeps it's BIOS in two distinct flash blocks.
40 ** Destroying any of these blocks transforms the DNPC into
41 ** a paperweight (albeit not a very useful one, considering
42 ** it only weighs a few grams).
44 ** Therefore, the BIOS blocks must never be erased or written to
45 ** except by people who know exactly what they are doing (e.g.
46 ** to install a BIOS update). These partitions are marked read-only
47 ** by default, but can be made read/write by undefining
48 ** DNPC_BIOS_BLOCKS_WRITEPROTECTED:
50 #define DNPC_BIOS_BLOCKS_WRITEPROTECTED
53 ** The ID string (in ROM) is checked to determine whether we
54 ** are running on a DNP/1486 or ADNP/1486
56 #define BIOSID_BASE 0x000fe100
58 #define ID_DNPC "DNP1486"
59 #define ID_ADNP "ADNP1486"
62 ** Address where the flash should appear in CPU space
64 #define FLASH_BASE 0x2000000
67 ** Chip Setup and Control (CSC) indexed register space
69 #define CSC_INDEX 0x22
72 #define CSC_MMSWAR 0x30 /* MMS window C-F attributes register */
73 #define CSC_MMSWDSR 0x31 /* MMS window C-F device select register */
75 #define CSC_RBWR 0xa7 /* GPIO Read-Back/Write Register B */
77 #define CSC_CR 0xd0 /* internal I/O device disable/Echo */
78 /* Z-bus/configuration register */
80 #define CSC_PCCMDCR 0xf1 /* PC card mode and DMA control register */
84 ** PC Card indexed register space:
87 #define PCC_INDEX 0x3e0
88 #define PCC_DATA 0x3e1
90 #define PCC_AWER_B 0x46 /* Socket B Address Window enable register */
91 #define PCC_MWSAR_1_Lo 0x58 /* memory window 1 start address low register */
92 #define PCC_MWSAR_1_Hi 0x59 /* memory window 1 start address high register */
93 #define PCC_MWEAR_1_Lo 0x5A /* memory window 1 stop address low register */
94 #define PCC_MWEAR_1_Hi 0x5B /* memory window 1 stop address high register */
95 #define PCC_MWAOR_1_Lo 0x5C /* memory window 1 address offset low register */
96 #define PCC_MWAOR_1_Hi 0x5D /* memory window 1 address offset high register */
100 ** Access to SC4x0's Chip Setup and Control (CSC)
101 ** and PC Card (PCC) indexed registers:
103 static inline void setcsc(int reg, unsigned char data)
105 outb(reg, CSC_INDEX);
106 outb(data, CSC_DATA);
109 static inline unsigned char getcsc(int reg)
111 outb(reg, CSC_INDEX);
112 return(inb(CSC_DATA));
115 static inline void setpcc(int reg, unsigned char data)
117 outb(reg, PCC_INDEX);
118 outb(data, PCC_DATA);
121 static inline unsigned char getpcc(int reg)
123 outb(reg, PCC_INDEX);
124 return(inb(PCC_DATA));
129 ************************************************************
130 ** Enable access to DIL/NetPC's flash by mapping it into
131 ** the SC4x0's MMS Window C.
132 ************************************************************
134 static void dnpc_map_flash(unsigned long flash_base, unsigned long flash_size)
136 unsigned long flash_end = flash_base + flash_size - 1;
139 ** enable setup of MMS windows C-F:
141 /* - enable PC Card indexed register space */
142 setcsc(CSC_CR, getcsc(CSC_CR) | 0x2);
143 /* - set PC Card controller to operate in standard mode */
144 setcsc(CSC_PCCMDCR, getcsc(CSC_PCCMDCR) & ~1);
147 ** Program base address and end address of window
148 ** where the flash ROM should appear in CPU address space
150 setpcc(PCC_MWSAR_1_Lo, (flash_base >> 12) & 0xff);
151 setpcc(PCC_MWSAR_1_Hi, (flash_base >> 20) & 0x3f);
152 setpcc(PCC_MWEAR_1_Lo, (flash_end >> 12) & 0xff);
153 setpcc(PCC_MWEAR_1_Hi, (flash_end >> 20) & 0x3f);
155 /* program offset of first flash location to appear in this window (0) */
156 setpcc(PCC_MWAOR_1_Lo, ((0 - flash_base) >> 12) & 0xff);
157 setpcc(PCC_MWAOR_1_Hi, ((0 - flash_base)>> 20) & 0x3f);
159 /* set attributes for MMS window C: non-cacheable, write-enabled */
160 setcsc(CSC_MMSWAR, getcsc(CSC_MMSWAR) & ~0x11);
162 /* select physical device ROMCS0 (i.e. flash) for MMS Window C */
163 setcsc(CSC_MMSWDSR, getcsc(CSC_MMSWDSR) & ~0x03);
165 /* enable memory window 1 */
166 setpcc(PCC_AWER_B, getpcc(PCC_AWER_B) | 0x02);
168 /* now disable PC Card indexed register space again */
169 setcsc(CSC_CR, getcsc(CSC_CR) & ~0x2);
174 ************************************************************
175 ** Disable access to DIL/NetPC's flash by mapping it into
176 ** the SC4x0's MMS Window C.
177 ************************************************************
179 static void dnpc_unmap_flash(void)
181 /* - enable PC Card indexed register space */
182 setcsc(CSC_CR, getcsc(CSC_CR) | 0x2);
184 /* disable memory window 1 */
185 setpcc(PCC_AWER_B, getpcc(PCC_AWER_B) & ~0x02);
187 /* now disable PC Card indexed register space again */
188 setcsc(CSC_CR, getcsc(CSC_CR) & ~0x2);
192 static __u8 dnpc_read8(struct map_info *map, unsigned long ofs)
194 return readb(map->map_priv_1 + ofs);
197 static __u16 dnpc_read16(struct map_info *map, unsigned long ofs)
199 return readw(map->map_priv_1 + ofs);
202 static __u32 dnpc_read32(struct map_info *map, unsigned long ofs)
204 return readl(map->map_priv_1 + ofs);
207 static void dnpc_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
209 memcpy_fromio(to, (void *)(map->map_priv_1 + from), len);
212 static void dnpc_write8(struct map_info *map, __u8 d, unsigned long adr)
214 writeb(d, map->map_priv_1 + adr);
217 static void dnpc_write16(struct map_info *map, __u16 d, unsigned long adr)
219 writew(d, map->map_priv_1 + adr);
222 static void dnpc_write32(struct map_info *map, __u32 d, unsigned long adr)
224 writel(d, map->map_priv_1 + adr);
227 static void dnpc_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
229 memcpy_toio((void *)(map->map_priv_1 + to), from, len);
233 ************************************************************
234 ** Enable/Disable VPP to write to flash
235 ************************************************************
238 static spinlock_t dnpc_spin = SPIN_LOCK_UNLOCKED;
239 static int vpp_counter = 0;
241 ** This is what has to be done for the DNP board ..
243 static void dnp_set_vpp(struct map_info *not_used, int on)
245 spin_lock_irq(&dnpc_spin);
249 if(++vpp_counter == 1)
250 setcsc(CSC_RBWR, getcsc(CSC_RBWR) & ~0x4);
254 if(--vpp_counter == 0)
255 setcsc(CSC_RBWR, getcsc(CSC_RBWR) | 0x4);
256 else if(vpp_counter < 0)
259 spin_unlock_irq(&dnpc_spin);
263 ** .. and this the ADNP version:
265 static void adnp_set_vpp(struct map_info *not_used, int on)
267 spin_lock_irq(&dnpc_spin);
271 if(++vpp_counter == 1)
272 setcsc(CSC_RBWR, getcsc(CSC_RBWR) & ~0x8);
276 if(--vpp_counter == 0)
277 setcsc(CSC_RBWR, getcsc(CSC_RBWR) | 0x8);
278 else if(vpp_counter < 0)
281 spin_unlock_irq(&dnpc_spin);
286 #define DNP_WINDOW_SIZE 0x00200000 /* DNP flash size is 2MiB */
287 #define ADNP_WINDOW_SIZE 0x00400000 /* ADNP flash size is 4MiB */
288 #define WINDOW_ADDR FLASH_BASE
290 static struct map_info dnpc_map = {
291 name: "ADNP Flash Bank",
292 size: ADNP_WINDOW_SIZE,
297 copy_from: dnpc_copy_from,
299 write16: dnpc_write16,
300 write32: dnpc_write32,
301 copy_to: dnpc_copy_to,
302 set_vpp: adnp_set_vpp,
303 map_priv_2: WINDOW_ADDR
307 ** The layout of the flash is somewhat "strange":
309 ** 1. 960 KiB (15 blocks) : Space for ROM Bootloader and user data
310 ** 2. 64 KiB (1 block) : System BIOS
311 ** 3. 960 KiB (15 blocks) : User Data (DNP model) or
312 ** 3. 3008 KiB (47 blocks) : User Data (ADNP model)
313 ** 4. 64 KiB (1 block) : System BIOS Entry
316 static struct mtd_partition partition_info[]=
324 name: "ADNP system BIOS",
325 offset: MTDPART_OFS_NXTBLK,
327 #ifdef DNPC_BIOS_BLOCKS_WRITEPROTECTED
328 mask_flags: MTD_WRITEABLE,
332 name: "ADNP file system",
333 offset: MTDPART_OFS_NXTBLK,
337 name: "ADNP system BIOS entry",
338 offset: MTDPART_OFS_NXTBLK,
339 size: MTDPART_SIZ_FULL,
340 #ifdef DNPC_BIOS_BLOCKS_WRITEPROTECTED
341 mask_flags: MTD_WRITEABLE,
346 #define NUM_PARTITIONS (sizeof(partition_info)/sizeof(partition_info[0]))
348 static struct mtd_info *mymtd;
349 static struct mtd_info *lowlvl_parts[NUM_PARTITIONS];
350 static struct mtd_info *merged_mtd;
353 ** "Highlevel" partition info:
355 ** Using the MTD concat layer, we can re-arrange partitions to our
356 ** liking: we construct a virtual MTD device by concatenating the
357 ** partitions, specifying the sequence such that the boot block
358 ** is immediately followed by the filesystem block (i.e. the stupid
359 ** system BIOS block is mapped to a different place). When re-partitioning
360 ** this concatenated MTD device, we can set the boot block size to
361 ** an arbitrary (though erase block aligned) value i.e. not one that
362 ** is dictated by the flash's physical layout. We can thus set the
363 ** boot block to be e.g. 64 KB (which is fully sufficient if we want
364 ** to boot an etherboot image) or to -say- 1.5 MB if we want to boot
365 ** a large kernel image. In all cases, the remainder of the flash
366 ** is available as file system space.
369 static struct mtd_partition higlvl_partition_info[]=
372 name: "ADNP boot block",
374 size: CONFIG_MTD_DILNETPC_BOOTSIZE,
377 name: "ADNP file system space",
378 offset: MTDPART_OFS_NXTBLK,
379 size: ADNP_WINDOW_SIZE-CONFIG_MTD_DILNETPC_BOOTSIZE-0x20000,
382 name: "ADNP system BIOS + BIOS Entry",
383 offset: MTDPART_OFS_NXTBLK,
384 size: MTDPART_SIZ_FULL,
385 #ifdef DNPC_BIOS_BLOCKS_WRITEPROTECTED
386 mask_flags: MTD_WRITEABLE,
391 #define NUM_HIGHLVL_PARTITIONS (sizeof(higlvl_partition_info)/sizeof(partition_info[0]))
394 static int dnp_adnp_probe(void)
396 char *biosid, rc = -1;
398 biosid = (char*)ioremap(BIOSID_BASE, 16);
401 if(!strcmp(biosid, ID_DNPC))
402 rc = 1; /* this is a DNPC */
403 else if(!strcmp(biosid, ID_ADNP))
404 rc = 0; /* this is a ADNPC */
406 iounmap((void *)biosid);
411 static int __init init_dnpc(void)
416 ** determine hardware (DNP/ADNP/invalid)
418 if((is_dnp = dnp_adnp_probe()) < 0)
422 ** Things are set up for ADNP by default
423 ** -> modify all that needs to be different for DNP
427 ** Adjust window size, select correct set_vpp function.
428 ** The partitioning scheme is identical on both DNP
429 ** and ADNP except for the size of the third partition.
432 dnpc_map.size = DNP_WINDOW_SIZE;
433 dnpc_map.set_vpp = dnp_set_vpp;
434 partition_info[2].size = 0xf0000;
437 ** increment all string pointers so the leading 'A' gets skipped,
438 ** thus turning all occurrences of "ADNP ..." into "DNP ..."
441 for(i = 0; i < NUM_PARTITIONS; i++)
442 ++partition_info[i].name;
443 higlvl_partition_info[1].size = DNP_WINDOW_SIZE -
444 CONFIG_MTD_DILNETPC_BOOTSIZE - 0x20000;
445 for(i = 0; i < NUM_HIGHLVL_PARTITIONS; i++)
446 ++higlvl_partition_info[i].name;
449 printk(KERN_NOTICE "DIL/Net %s flash: 0x%lx at 0x%lx\n",
450 is_dnp ? "DNPC" : "ADNP", dnpc_map.size, dnpc_map.map_priv_2);
452 dnpc_map.map_priv_1 = (unsigned long)ioremap_nocache(dnpc_map.map_priv_2, dnpc_map.size);
454 dnpc_map_flash(dnpc_map.map_priv_2, dnpc_map.size);
456 if (!dnpc_map.map_priv_1) {
457 printk("Failed to ioremap_nocache\n");
461 printk("FLASH virtual address: 0x%lx\n", dnpc_map.map_priv_1);
463 mymtd = do_map_probe("jedec_probe", &dnpc_map);
466 mymtd = do_map_probe("cfi_probe", &dnpc_map);
469 ** If flash probes fail, try to make flashes accessible
470 ** at least as ROM. Ajust erasesize in this case since
471 ** the default one (128M) will break our partitioning
474 if((mymtd = do_map_probe("map_rom", &dnpc_map)))
475 mymtd->erasesize = 0x10000;
478 iounmap((void *)dnpc_map.map_priv_1);
482 mymtd->module = THIS_MODULE;
485 ** Supply pointers to lowlvl_parts[] array to add_mtd_partitions()
486 ** -> add_mtd_partitions() will _not_ register MTD devices for
487 ** the partitions, but will instead store pointers to the MTD
488 ** objects it creates into our lowlvl_parts[] array.
489 ** NOTE: we arrange the pointers such that the sequence of the
490 ** partitions gets re-arranged: partition #2 follows
493 partition_info[0].mtdp = &lowlvl_parts[0];
494 partition_info[1].mtdp = &lowlvl_parts[2];
495 partition_info[2].mtdp = &lowlvl_parts[1];
496 partition_info[3].mtdp = &lowlvl_parts[3];
498 add_mtd_partitions(mymtd, partition_info, NUM_PARTITIONS);
501 ** now create a virtual MTD device by concatenating the for partitions
502 ** (in the sequence given by the lowlvl_parts[] array.
504 merged_mtd = mtd_concat_create(lowlvl_parts, NUM_PARTITIONS, "(A)DNP Flash Concatenated");
507 ** now partition the new device the way we want it. This time,
508 ** we do not supply mtd pointers in higlvl_partition_info, so
509 ** add_mtd_partitions() will register the devices.
511 add_mtd_partitions(merged_mtd, higlvl_partition_info, NUM_HIGHLVL_PARTITIONS);
517 static void __exit cleanup_dnpc(void)
520 del_mtd_partitions(merged_mtd);
521 mtd_concat_destroy(merged_mtd);
525 del_mtd_partitions(mymtd);
528 if (dnpc_map.map_priv_1) {
529 iounmap((void *)dnpc_map.map_priv_1);
531 dnpc_map.map_priv_1 = 0;
535 module_init(init_dnpc);
536 module_exit(cleanup_dnpc);
538 MODULE_LICENSE("GPL");
539 MODULE_AUTHOR("Sysgo Real-Time Solutions GmbH");
540 MODULE_DESCRIPTION("MTD map driver for SSV DIL/NetPC DNP & ADNP");