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 1.20 2005/11/07 11:14:26 gleixner 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/module.h>
29 #include <linux/types.h>
30 #include <linux/kernel.h>
31 #include <linux/init.h>
32 #include <linux/string.h>
34 #include <linux/mtd/mtd.h>
35 #include <linux/mtd/map.h>
36 #include <linux/mtd/partitions.h>
37 #include <linux/mtd/concat.h>
42 ** The DIL/NetPC keeps its BIOS in two distinct flash blocks.
43 ** Destroying any of these blocks transforms the DNPC into
44 ** a paperweight (albeit not a very useful one, considering
45 ** it only weighs a few grams).
47 ** Therefore, the BIOS blocks must never be erased or written to
48 ** except by people who know exactly what they are doing (e.g.
49 ** to install a BIOS update). These partitions are marked read-only
50 ** by default, but can be made read/write by undefining
51 ** DNPC_BIOS_BLOCKS_WRITEPROTECTED:
53 #define DNPC_BIOS_BLOCKS_WRITEPROTECTED
56 ** The ID string (in ROM) is checked to determine whether we
57 ** are running on a DNP/1486 or ADNP/1486
59 #define BIOSID_BASE 0x000fe100
61 #define ID_DNPC "DNP1486"
62 #define ID_ADNP "ADNP1486"
65 ** Address where the flash should appear in CPU space
67 #define FLASH_BASE 0x2000000
70 ** Chip Setup and Control (CSC) indexed register space
72 #define CSC_INDEX 0x22
75 #define CSC_MMSWAR 0x30 /* MMS window C-F attributes register */
76 #define CSC_MMSWDSR 0x31 /* MMS window C-F device select register */
78 #define CSC_RBWR 0xa7 /* GPIO Read-Back/Write Register B */
80 #define CSC_CR 0xd0 /* internal I/O device disable/Echo */
81 /* Z-bus/configuration register */
83 #define CSC_PCCMDCR 0xf1 /* PC card mode and DMA control register */
87 ** PC Card indexed register space:
90 #define PCC_INDEX 0x3e0
91 #define PCC_DATA 0x3e1
93 #define PCC_AWER_B 0x46 /* Socket B Address Window enable register */
94 #define PCC_MWSAR_1_Lo 0x58 /* memory window 1 start address low register */
95 #define PCC_MWSAR_1_Hi 0x59 /* memory window 1 start address high register */
96 #define PCC_MWEAR_1_Lo 0x5A /* memory window 1 stop address low register */
97 #define PCC_MWEAR_1_Hi 0x5B /* memory window 1 stop address high register */
98 #define PCC_MWAOR_1_Lo 0x5C /* memory window 1 address offset low register */
99 #define PCC_MWAOR_1_Hi 0x5D /* memory window 1 address offset high register */
103 ** Access to SC4x0's Chip Setup and Control (CSC)
104 ** and PC Card (PCC) indexed registers:
106 static inline void setcsc(int reg, unsigned char data)
108 outb(reg, CSC_INDEX);
109 outb(data, CSC_DATA);
112 static inline unsigned char getcsc(int reg)
114 outb(reg, CSC_INDEX);
115 return(inb(CSC_DATA));
118 static inline void setpcc(int reg, unsigned char data)
120 outb(reg, PCC_INDEX);
121 outb(data, PCC_DATA);
124 static inline unsigned char getpcc(int reg)
126 outb(reg, PCC_INDEX);
127 return(inb(PCC_DATA));
132 ************************************************************
133 ** Enable access to DIL/NetPC's flash by mapping it into
134 ** the SC4x0's MMS Window C.
135 ************************************************************
137 static void dnpc_map_flash(unsigned long flash_base, unsigned long flash_size)
139 unsigned long flash_end = flash_base + flash_size - 1;
142 ** enable setup of MMS windows C-F:
144 /* - enable PC Card indexed register space */
145 setcsc(CSC_CR, getcsc(CSC_CR) | 0x2);
146 /* - set PC Card controller to operate in standard mode */
147 setcsc(CSC_PCCMDCR, getcsc(CSC_PCCMDCR) & ~1);
150 ** Program base address and end address of window
151 ** where the flash ROM should appear in CPU address space
153 setpcc(PCC_MWSAR_1_Lo, (flash_base >> 12) & 0xff);
154 setpcc(PCC_MWSAR_1_Hi, (flash_base >> 20) & 0x3f);
155 setpcc(PCC_MWEAR_1_Lo, (flash_end >> 12) & 0xff);
156 setpcc(PCC_MWEAR_1_Hi, (flash_end >> 20) & 0x3f);
158 /* program offset of first flash location to appear in this window (0) */
159 setpcc(PCC_MWAOR_1_Lo, ((0 - flash_base) >> 12) & 0xff);
160 setpcc(PCC_MWAOR_1_Hi, ((0 - flash_base)>> 20) & 0x3f);
162 /* set attributes for MMS window C: non-cacheable, write-enabled */
163 setcsc(CSC_MMSWAR, getcsc(CSC_MMSWAR) & ~0x11);
165 /* select physical device ROMCS0 (i.e. flash) for MMS Window C */
166 setcsc(CSC_MMSWDSR, getcsc(CSC_MMSWDSR) & ~0x03);
168 /* enable memory window 1 */
169 setpcc(PCC_AWER_B, getpcc(PCC_AWER_B) | 0x02);
171 /* now disable PC Card indexed register space again */
172 setcsc(CSC_CR, getcsc(CSC_CR) & ~0x2);
177 ************************************************************
178 ** Disable access to DIL/NetPC's flash by mapping it into
179 ** the SC4x0's MMS Window C.
180 ************************************************************
182 static void dnpc_unmap_flash(void)
184 /* - enable PC Card indexed register space */
185 setcsc(CSC_CR, getcsc(CSC_CR) | 0x2);
187 /* disable memory window 1 */
188 setpcc(PCC_AWER_B, getpcc(PCC_AWER_B) & ~0x02);
190 /* now disable PC Card indexed register space again */
191 setcsc(CSC_CR, getcsc(CSC_CR) & ~0x2);
197 ************************************************************
198 ** Enable/Disable VPP to write to flash
199 ************************************************************
202 static DEFINE_SPINLOCK(dnpc_spin);
203 static int vpp_counter = 0;
205 ** This is what has to be done for the DNP board ..
207 static void dnp_set_vpp(struct map_info *not_used, int on)
209 spin_lock_irq(&dnpc_spin);
213 if(++vpp_counter == 1)
214 setcsc(CSC_RBWR, getcsc(CSC_RBWR) & ~0x4);
218 if(--vpp_counter == 0)
219 setcsc(CSC_RBWR, getcsc(CSC_RBWR) | 0x4);
221 BUG_ON(vpp_counter < 0);
223 spin_unlock_irq(&dnpc_spin);
227 ** .. and this the ADNP version:
229 static void adnp_set_vpp(struct map_info *not_used, int on)
231 spin_lock_irq(&dnpc_spin);
235 if(++vpp_counter == 1)
236 setcsc(CSC_RBWR, getcsc(CSC_RBWR) & ~0x8);
240 if(--vpp_counter == 0)
241 setcsc(CSC_RBWR, getcsc(CSC_RBWR) | 0x8);
243 BUG_ON(vpp_counter < 0);
245 spin_unlock_irq(&dnpc_spin);
250 #define DNP_WINDOW_SIZE 0x00200000 /* DNP flash size is 2MiB */
251 #define ADNP_WINDOW_SIZE 0x00400000 /* ADNP flash size is 4MiB */
252 #define WINDOW_ADDR FLASH_BASE
254 static struct map_info dnpc_map = {
255 .name = "ADNP Flash Bank",
256 .size = ADNP_WINDOW_SIZE,
258 .set_vpp = adnp_set_vpp,
263 ** The layout of the flash is somewhat "strange":
265 ** 1. 960 KiB (15 blocks) : Space for ROM Bootloader and user data
266 ** 2. 64 KiB (1 block) : System BIOS
267 ** 3. 960 KiB (15 blocks) : User Data (DNP model) or
268 ** 3. 3008 KiB (47 blocks) : User Data (ADNP model)
269 ** 4. 64 KiB (1 block) : System BIOS Entry
272 static struct mtd_partition partition_info[]=
280 .name = "ADNP system BIOS",
281 .offset = MTDPART_OFS_NXTBLK,
283 #ifdef DNPC_BIOS_BLOCKS_WRITEPROTECTED
284 .mask_flags = MTD_WRITEABLE,
288 .name = "ADNP file system",
289 .offset = MTDPART_OFS_NXTBLK,
293 .name = "ADNP system BIOS entry",
294 .offset = MTDPART_OFS_NXTBLK,
295 .size = MTDPART_SIZ_FULL,
296 #ifdef DNPC_BIOS_BLOCKS_WRITEPROTECTED
297 .mask_flags = MTD_WRITEABLE,
302 #define NUM_PARTITIONS ARRAY_SIZE(partition_info)
304 static struct mtd_info *mymtd;
305 static struct mtd_info *lowlvl_parts[NUM_PARTITIONS];
306 static struct mtd_info *merged_mtd;
309 ** "Highlevel" partition info:
311 ** Using the MTD concat layer, we can re-arrange partitions to our
312 ** liking: we construct a virtual MTD device by concatenating the
313 ** partitions, specifying the sequence such that the boot block
314 ** is immediately followed by the filesystem block (i.e. the stupid
315 ** system BIOS block is mapped to a different place). When re-partitioning
316 ** this concatenated MTD device, we can set the boot block size to
317 ** an arbitrary (though erase block aligned) value i.e. not one that
318 ** is dictated by the flash's physical layout. We can thus set the
319 ** boot block to be e.g. 64 KB (which is fully sufficient if we want
320 ** to boot an etherboot image) or to -say- 1.5 MB if we want to boot
321 ** a large kernel image. In all cases, the remainder of the flash
322 ** is available as file system space.
325 static struct mtd_partition higlvl_partition_info[]=
328 .name = "ADNP boot block",
330 .size = CONFIG_MTD_DILNETPC_BOOTSIZE,
333 .name = "ADNP file system space",
334 .offset = MTDPART_OFS_NXTBLK,
335 .size = ADNP_WINDOW_SIZE-CONFIG_MTD_DILNETPC_BOOTSIZE-0x20000,
338 .name = "ADNP system BIOS + BIOS Entry",
339 .offset = MTDPART_OFS_NXTBLK,
340 .size = MTDPART_SIZ_FULL,
341 #ifdef DNPC_BIOS_BLOCKS_WRITEPROTECTED
342 .mask_flags = MTD_WRITEABLE,
347 #define NUM_HIGHLVL_PARTITIONS ARRAY_SIZE(higlvl_partition_info)
350 static int dnp_adnp_probe(void)
352 char *biosid, rc = -1;
354 biosid = (char*)ioremap(BIOSID_BASE, 16);
357 if(!strcmp(biosid, ID_DNPC))
358 rc = 1; /* this is a DNPC */
359 else if(!strcmp(biosid, ID_ADNP))
360 rc = 0; /* this is a ADNPC */
362 iounmap((void *)biosid);
367 static int __init init_dnpc(void)
372 ** determine hardware (DNP/ADNP/invalid)
374 if((is_dnp = dnp_adnp_probe()) < 0)
378 ** Things are set up for ADNP by default
379 ** -> modify all that needs to be different for DNP
383 ** Adjust window size, select correct set_vpp function.
384 ** The partitioning scheme is identical on both DNP
385 ** and ADNP except for the size of the third partition.
388 dnpc_map.size = DNP_WINDOW_SIZE;
389 dnpc_map.set_vpp = dnp_set_vpp;
390 partition_info[2].size = 0xf0000;
393 ** increment all string pointers so the leading 'A' gets skipped,
394 ** thus turning all occurrences of "ADNP ..." into "DNP ..."
397 for(i = 0; i < NUM_PARTITIONS; i++)
398 ++partition_info[i].name;
399 higlvl_partition_info[1].size = DNP_WINDOW_SIZE -
400 CONFIG_MTD_DILNETPC_BOOTSIZE - 0x20000;
401 for(i = 0; i < NUM_HIGHLVL_PARTITIONS; i++)
402 ++higlvl_partition_info[i].name;
405 printk(KERN_NOTICE "DIL/Net %s flash: 0x%lx at 0x%llx\n",
406 is_dnp ? "DNPC" : "ADNP", dnpc_map.size, (unsigned long long)dnpc_map.phys);
408 dnpc_map.virt = ioremap_nocache(dnpc_map.phys, dnpc_map.size);
410 dnpc_map_flash(dnpc_map.phys, dnpc_map.size);
412 if (!dnpc_map.virt) {
413 printk("Failed to ioremap_nocache\n");
416 simple_map_init(&dnpc_map);
418 printk("FLASH virtual address: 0x%p\n", dnpc_map.virt);
420 mymtd = do_map_probe("jedec_probe", &dnpc_map);
423 mymtd = do_map_probe("cfi_probe", &dnpc_map);
426 ** If flash probes fail, try to make flashes accessible
427 ** at least as ROM. Ajust erasesize in this case since
428 ** the default one (128M) will break our partitioning
431 if((mymtd = do_map_probe("map_rom", &dnpc_map)))
432 mymtd->erasesize = 0x10000;
435 iounmap(dnpc_map.virt);
439 mymtd->owner = THIS_MODULE;
442 ** Supply pointers to lowlvl_parts[] array to add_mtd_partitions()
443 ** -> add_mtd_partitions() will _not_ register MTD devices for
444 ** the partitions, but will instead store pointers to the MTD
445 ** objects it creates into our lowlvl_parts[] array.
446 ** NOTE: we arrange the pointers such that the sequence of the
447 ** partitions gets re-arranged: partition #2 follows
450 partition_info[0].mtdp = &lowlvl_parts[0];
451 partition_info[1].mtdp = &lowlvl_parts[2];
452 partition_info[2].mtdp = &lowlvl_parts[1];
453 partition_info[3].mtdp = &lowlvl_parts[3];
455 add_mtd_partitions(mymtd, partition_info, NUM_PARTITIONS);
458 ** now create a virtual MTD device by concatenating the for partitions
459 ** (in the sequence given by the lowlvl_parts[] array.
461 merged_mtd = mtd_concat_create(lowlvl_parts, NUM_PARTITIONS, "(A)DNP Flash Concatenated");
464 ** now partition the new device the way we want it. This time,
465 ** we do not supply mtd pointers in higlvl_partition_info, so
466 ** add_mtd_partitions() will register the devices.
468 add_mtd_partitions(merged_mtd, higlvl_partition_info, NUM_HIGHLVL_PARTITIONS);
474 static void __exit cleanup_dnpc(void)
477 del_mtd_partitions(merged_mtd);
478 mtd_concat_destroy(merged_mtd);
482 del_mtd_partitions(mymtd);
486 iounmap(dnpc_map.virt);
488 dnpc_map.virt = NULL;
492 module_init(init_dnpc);
493 module_exit(cleanup_dnpc);
495 MODULE_LICENSE("GPL");
496 MODULE_AUTHOR("Sysgo Real-Time Solutions GmbH");
497 MODULE_DESCRIPTION("MTD map driver for SSV DIL/NetPC DNP & ADNP");