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/config.h>
29 #include <linux/module.h>
30 #include <linux/types.h>
31 #include <linux/kernel.h>
32 #include <linux/init.h>
33 #include <linux/string.h>
35 #include <linux/mtd/mtd.h>
36 #include <linux/mtd/map.h>
37 #include <linux/mtd/partitions.h>
38 #include <linux/mtd/concat.h>
43 ** The DIL/NetPC keeps its BIOS in two distinct flash blocks.
44 ** Destroying any of these blocks transforms the DNPC into
45 ** a paperweight (albeit not a very useful one, considering
46 ** it only weighs a few grams).
48 ** Therefore, the BIOS blocks must never be erased or written to
49 ** except by people who know exactly what they are doing (e.g.
50 ** to install a BIOS update). These partitions are marked read-only
51 ** by default, but can be made read/write by undefining
52 ** DNPC_BIOS_BLOCKS_WRITEPROTECTED:
54 #define DNPC_BIOS_BLOCKS_WRITEPROTECTED
57 ** The ID string (in ROM) is checked to determine whether we
58 ** are running on a DNP/1486 or ADNP/1486
60 #define BIOSID_BASE 0x000fe100
62 #define ID_DNPC "DNP1486"
63 #define ID_ADNP "ADNP1486"
66 ** Address where the flash should appear in CPU space
68 #define FLASH_BASE 0x2000000
71 ** Chip Setup and Control (CSC) indexed register space
73 #define CSC_INDEX 0x22
76 #define CSC_MMSWAR 0x30 /* MMS window C-F attributes register */
77 #define CSC_MMSWDSR 0x31 /* MMS window C-F device select register */
79 #define CSC_RBWR 0xa7 /* GPIO Read-Back/Write Register B */
81 #define CSC_CR 0xd0 /* internal I/O device disable/Echo */
82 /* Z-bus/configuration register */
84 #define CSC_PCCMDCR 0xf1 /* PC card mode and DMA control register */
88 ** PC Card indexed register space:
91 #define PCC_INDEX 0x3e0
92 #define PCC_DATA 0x3e1
94 #define PCC_AWER_B 0x46 /* Socket B Address Window enable register */
95 #define PCC_MWSAR_1_Lo 0x58 /* memory window 1 start address low register */
96 #define PCC_MWSAR_1_Hi 0x59 /* memory window 1 start address high register */
97 #define PCC_MWEAR_1_Lo 0x5A /* memory window 1 stop address low register */
98 #define PCC_MWEAR_1_Hi 0x5B /* memory window 1 stop address high register */
99 #define PCC_MWAOR_1_Lo 0x5C /* memory window 1 address offset low register */
100 #define PCC_MWAOR_1_Hi 0x5D /* memory window 1 address offset high register */
104 ** Access to SC4x0's Chip Setup and Control (CSC)
105 ** and PC Card (PCC) indexed registers:
107 static inline void setcsc(int reg, unsigned char data)
109 outb(reg, CSC_INDEX);
110 outb(data, CSC_DATA);
113 static inline unsigned char getcsc(int reg)
115 outb(reg, CSC_INDEX);
116 return(inb(CSC_DATA));
119 static inline void setpcc(int reg, unsigned char data)
121 outb(reg, PCC_INDEX);
122 outb(data, PCC_DATA);
125 static inline unsigned char getpcc(int reg)
127 outb(reg, PCC_INDEX);
128 return(inb(PCC_DATA));
133 ************************************************************
134 ** Enable access to DIL/NetPC's flash by mapping it into
135 ** the SC4x0's MMS Window C.
136 ************************************************************
138 static void dnpc_map_flash(unsigned long flash_base, unsigned long flash_size)
140 unsigned long flash_end = flash_base + flash_size - 1;
143 ** enable setup of MMS windows C-F:
145 /* - enable PC Card indexed register space */
146 setcsc(CSC_CR, getcsc(CSC_CR) | 0x2);
147 /* - set PC Card controller to operate in standard mode */
148 setcsc(CSC_PCCMDCR, getcsc(CSC_PCCMDCR) & ~1);
151 ** Program base address and end address of window
152 ** where the flash ROM should appear in CPU address space
154 setpcc(PCC_MWSAR_1_Lo, (flash_base >> 12) & 0xff);
155 setpcc(PCC_MWSAR_1_Hi, (flash_base >> 20) & 0x3f);
156 setpcc(PCC_MWEAR_1_Lo, (flash_end >> 12) & 0xff);
157 setpcc(PCC_MWEAR_1_Hi, (flash_end >> 20) & 0x3f);
159 /* program offset of first flash location to appear in this window (0) */
160 setpcc(PCC_MWAOR_1_Lo, ((0 - flash_base) >> 12) & 0xff);
161 setpcc(PCC_MWAOR_1_Hi, ((0 - flash_base)>> 20) & 0x3f);
163 /* set attributes for MMS window C: non-cacheable, write-enabled */
164 setcsc(CSC_MMSWAR, getcsc(CSC_MMSWAR) & ~0x11);
166 /* select physical device ROMCS0 (i.e. flash) for MMS Window C */
167 setcsc(CSC_MMSWDSR, getcsc(CSC_MMSWDSR) & ~0x03);
169 /* enable memory window 1 */
170 setpcc(PCC_AWER_B, getpcc(PCC_AWER_B) | 0x02);
172 /* now disable PC Card indexed register space again */
173 setcsc(CSC_CR, getcsc(CSC_CR) & ~0x2);
178 ************************************************************
179 ** Disable access to DIL/NetPC's flash by mapping it into
180 ** the SC4x0's MMS Window C.
181 ************************************************************
183 static void dnpc_unmap_flash(void)
185 /* - enable PC Card indexed register space */
186 setcsc(CSC_CR, getcsc(CSC_CR) | 0x2);
188 /* disable memory window 1 */
189 setpcc(PCC_AWER_B, getpcc(PCC_AWER_B) & ~0x02);
191 /* now disable PC Card indexed register space again */
192 setcsc(CSC_CR, getcsc(CSC_CR) & ~0x2);
198 ************************************************************
199 ** Enable/Disable VPP to write to flash
200 ************************************************************
203 static DEFINE_SPINLOCK(dnpc_spin);
204 static int vpp_counter = 0;
206 ** This is what has to be done for the DNP board ..
208 static void dnp_set_vpp(struct map_info *not_used, int on)
210 spin_lock_irq(&dnpc_spin);
214 if(++vpp_counter == 1)
215 setcsc(CSC_RBWR, getcsc(CSC_RBWR) & ~0x4);
219 if(--vpp_counter == 0)
220 setcsc(CSC_RBWR, getcsc(CSC_RBWR) | 0x4);
221 else if(vpp_counter < 0)
224 spin_unlock_irq(&dnpc_spin);
228 ** .. and this the ADNP version:
230 static void adnp_set_vpp(struct map_info *not_used, int on)
232 spin_lock_irq(&dnpc_spin);
236 if(++vpp_counter == 1)
237 setcsc(CSC_RBWR, getcsc(CSC_RBWR) & ~0x8);
241 if(--vpp_counter == 0)
242 setcsc(CSC_RBWR, getcsc(CSC_RBWR) | 0x8);
243 else if(vpp_counter < 0)
246 spin_unlock_irq(&dnpc_spin);
251 #define DNP_WINDOW_SIZE 0x00200000 /* DNP flash size is 2MiB */
252 #define ADNP_WINDOW_SIZE 0x00400000 /* ADNP flash size is 4MiB */
253 #define WINDOW_ADDR FLASH_BASE
255 static struct map_info dnpc_map = {
256 .name = "ADNP Flash Bank",
257 .size = ADNP_WINDOW_SIZE,
259 .set_vpp = adnp_set_vpp,
264 ** The layout of the flash is somewhat "strange":
266 ** 1. 960 KiB (15 blocks) : Space for ROM Bootloader and user data
267 ** 2. 64 KiB (1 block) : System BIOS
268 ** 3. 960 KiB (15 blocks) : User Data (DNP model) or
269 ** 3. 3008 KiB (47 blocks) : User Data (ADNP model)
270 ** 4. 64 KiB (1 block) : System BIOS Entry
273 static struct mtd_partition partition_info[]=
281 .name = "ADNP system BIOS",
282 .offset = MTDPART_OFS_NXTBLK,
284 #ifdef DNPC_BIOS_BLOCKS_WRITEPROTECTED
285 .mask_flags = MTD_WRITEABLE,
289 .name = "ADNP file system",
290 .offset = MTDPART_OFS_NXTBLK,
294 .name = "ADNP system BIOS entry",
295 .offset = MTDPART_OFS_NXTBLK,
296 .size = MTDPART_SIZ_FULL,
297 #ifdef DNPC_BIOS_BLOCKS_WRITEPROTECTED
298 .mask_flags = MTD_WRITEABLE,
303 #define NUM_PARTITIONS (sizeof(partition_info)/sizeof(partition_info[0]))
305 static struct mtd_info *mymtd;
306 static struct mtd_info *lowlvl_parts[NUM_PARTITIONS];
307 static struct mtd_info *merged_mtd;
310 ** "Highlevel" partition info:
312 ** Using the MTD concat layer, we can re-arrange partitions to our
313 ** liking: we construct a virtual MTD device by concatenating the
314 ** partitions, specifying the sequence such that the boot block
315 ** is immediately followed by the filesystem block (i.e. the stupid
316 ** system BIOS block is mapped to a different place). When re-partitioning
317 ** this concatenated MTD device, we can set the boot block size to
318 ** an arbitrary (though erase block aligned) value i.e. not one that
319 ** is dictated by the flash's physical layout. We can thus set the
320 ** boot block to be e.g. 64 KB (which is fully sufficient if we want
321 ** to boot an etherboot image) or to -say- 1.5 MB if we want to boot
322 ** a large kernel image. In all cases, the remainder of the flash
323 ** is available as file system space.
326 static struct mtd_partition higlvl_partition_info[]=
329 .name = "ADNP boot block",
331 .size = CONFIG_MTD_DILNETPC_BOOTSIZE,
334 .name = "ADNP file system space",
335 .offset = MTDPART_OFS_NXTBLK,
336 .size = ADNP_WINDOW_SIZE-CONFIG_MTD_DILNETPC_BOOTSIZE-0x20000,
339 .name = "ADNP system BIOS + BIOS Entry",
340 .offset = MTDPART_OFS_NXTBLK,
341 .size = MTDPART_SIZ_FULL,
342 #ifdef DNPC_BIOS_BLOCKS_WRITEPROTECTED
343 .mask_flags = MTD_WRITEABLE,
348 #define NUM_HIGHLVL_PARTITIONS (sizeof(higlvl_partition_info)/sizeof(partition_info[0]))
351 static int dnp_adnp_probe(void)
353 char *biosid, rc = -1;
355 biosid = (char*)ioremap(BIOSID_BASE, 16);
358 if(!strcmp(biosid, ID_DNPC))
359 rc = 1; /* this is a DNPC */
360 else if(!strcmp(biosid, ID_ADNP))
361 rc = 0; /* this is a ADNPC */
363 iounmap((void *)biosid);
368 static int __init init_dnpc(void)
373 ** determine hardware (DNP/ADNP/invalid)
375 if((is_dnp = dnp_adnp_probe()) < 0)
379 ** Things are set up for ADNP by default
380 ** -> modify all that needs to be different for DNP
384 ** Adjust window size, select correct set_vpp function.
385 ** The partitioning scheme is identical on both DNP
386 ** and ADNP except for the size of the third partition.
389 dnpc_map.size = DNP_WINDOW_SIZE;
390 dnpc_map.set_vpp = dnp_set_vpp;
391 partition_info[2].size = 0xf0000;
394 ** increment all string pointers so the leading 'A' gets skipped,
395 ** thus turning all occurrences of "ADNP ..." into "DNP ..."
398 for(i = 0; i < NUM_PARTITIONS; i++)
399 ++partition_info[i].name;
400 higlvl_partition_info[1].size = DNP_WINDOW_SIZE -
401 CONFIG_MTD_DILNETPC_BOOTSIZE - 0x20000;
402 for(i = 0; i < NUM_HIGHLVL_PARTITIONS; i++)
403 ++higlvl_partition_info[i].name;
406 printk(KERN_NOTICE "DIL/Net %s flash: 0x%lx at 0x%lx\n",
407 is_dnp ? "DNPC" : "ADNP", dnpc_map.size, dnpc_map.phys);
409 dnpc_map.virt = ioremap_nocache(dnpc_map.phys, dnpc_map.size);
411 dnpc_map_flash(dnpc_map.phys, dnpc_map.size);
413 if (!dnpc_map.virt) {
414 printk("Failed to ioremap_nocache\n");
417 simple_map_init(&dnpc_map);
419 printk("FLASH virtual address: 0x%p\n", dnpc_map.virt);
421 mymtd = do_map_probe("jedec_probe", &dnpc_map);
424 mymtd = do_map_probe("cfi_probe", &dnpc_map);
427 ** If flash probes fail, try to make flashes accessible
428 ** at least as ROM. Ajust erasesize in this case since
429 ** the default one (128M) will break our partitioning
432 if((mymtd = do_map_probe("map_rom", &dnpc_map)))
433 mymtd->erasesize = 0x10000;
436 iounmap(dnpc_map.virt);
440 mymtd->owner = THIS_MODULE;
443 ** Supply pointers to lowlvl_parts[] array to add_mtd_partitions()
444 ** -> add_mtd_partitions() will _not_ register MTD devices for
445 ** the partitions, but will instead store pointers to the MTD
446 ** objects it creates into our lowlvl_parts[] array.
447 ** NOTE: we arrange the pointers such that the sequence of the
448 ** partitions gets re-arranged: partition #2 follows
451 partition_info[0].mtdp = &lowlvl_parts[0];
452 partition_info[1].mtdp = &lowlvl_parts[2];
453 partition_info[2].mtdp = &lowlvl_parts[1];
454 partition_info[3].mtdp = &lowlvl_parts[3];
456 add_mtd_partitions(mymtd, partition_info, NUM_PARTITIONS);
459 ** now create a virtual MTD device by concatenating the for partitions
460 ** (in the sequence given by the lowlvl_parts[] array.
462 merged_mtd = mtd_concat_create(lowlvl_parts, NUM_PARTITIONS, "(A)DNP Flash Concatenated");
465 ** now partition the new device the way we want it. This time,
466 ** we do not supply mtd pointers in higlvl_partition_info, so
467 ** add_mtd_partitions() will register the devices.
469 add_mtd_partitions(merged_mtd, higlvl_partition_info, NUM_HIGHLVL_PARTITIONS);
475 static void __exit cleanup_dnpc(void)
478 del_mtd_partitions(merged_mtd);
479 mtd_concat_destroy(merged_mtd);
483 del_mtd_partitions(mymtd);
487 iounmap(dnpc_map.virt);
489 dnpc_map.virt = NULL;
493 module_init(init_dnpc);
494 module_exit(cleanup_dnpc);
496 MODULE_LICENSE("GPL");
497 MODULE_AUTHOR("Sysgo Real-Time Solutions GmbH");
498 MODULE_DESCRIPTION("MTD map driver for SSV DIL/NetPC DNP & ADNP");