nettel.c revision 85795dac740e63e81aeec8d49aada54ab07656b5 
1/****************************************************************************/
2
3/*
4 *      nettel.c -- mappings for NETtel/SecureEdge/SnapGear (x86) boards.
5 *
6 *      (C) Copyright 2000-2001, Greg Ungerer (gerg@snapgear.com)
7 *      (C) Copyright 2001-2002, SnapGear (www.snapgear.com)
8 */
9
10/****************************************************************************/
11
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/types.h>
15#include <linux/kernel.h>
16#include <linux/mtd/mtd.h>
17#include <linux/mtd/map.h>
18#include <linux/mtd/partitions.h>
19#include <linux/mtd/cfi.h>
20#include <linux/reboot.h>
21#include <linux/err.h>
22#include <linux/kdev_t.h>
23#include <linux/root_dev.h>
24#include <asm/io.h>
25
26/****************************************************************************/
27
28#define INTEL_BUSWIDTH		1
29#define AMD_WINDOW_MAXSIZE	0x00200000
30#define AMD_BUSWIDTH	 	1
31
32/*
33 *	PAR masks and shifts, assuming 64K pages.
34 */
35#define SC520_PAR_ADDR_MASK	0x00003fff
36#define SC520_PAR_ADDR_SHIFT	16
37#define SC520_PAR_TO_ADDR(par) \
38	(((par)&SC520_PAR_ADDR_MASK) << SC520_PAR_ADDR_SHIFT)
39
40#define SC520_PAR_SIZE_MASK	0x01ffc000
41#define SC520_PAR_SIZE_SHIFT	2
42#define SC520_PAR_TO_SIZE(par) \
43	((((par)&SC520_PAR_SIZE_MASK) << SC520_PAR_SIZE_SHIFT) + (64*1024))
44
45#define SC520_PAR(cs, addr, size) \
46	((cs) | \
47	((((size)-(64*1024)) >> SC520_PAR_SIZE_SHIFT) & SC520_PAR_SIZE_MASK) | \
48	(((addr) >> SC520_PAR_ADDR_SHIFT) & SC520_PAR_ADDR_MASK))
49
50#define SC520_PAR_BOOTCS	0x8a000000
51#define	SC520_PAR_ROMCS1	0xaa000000
52#define SC520_PAR_ROMCS2	0xca000000	/* Cache disabled, 64K page */
53
54static void *nettel_mmcrp = NULL;
55
56#ifdef CONFIG_MTD_CFI_INTELEXT
57static struct mtd_info *intel_mtd;
58#endif
59static struct mtd_info *amd_mtd;
60
61/****************************************************************************/
62
63/****************************************************************************/
64
65#ifdef CONFIG_MTD_CFI_INTELEXT
66static struct map_info nettel_intel_map = {
67	.name = "SnapGear Intel",
68	.size = 0,
69	.bankwidth = INTEL_BUSWIDTH,
70};
71
72static struct mtd_partition nettel_intel_partitions[] = {
73	{
74		.name = "SnapGear kernel",
75		.offset = 0,
76		.size = 0x000e0000
77	},
78	{
79		.name = "SnapGear filesystem",
80		.offset = 0x00100000,
81	},
82	{
83		.name = "SnapGear config",
84		.offset = 0x000e0000,
85		.size = 0x00020000
86	},
87	{
88		.name = "SnapGear Intel",
89		.offset = 0
90	},
91	{
92		.name = "SnapGear BIOS Config",
93		.offset = 0x007e0000,
94		.size = 0x00020000
95	},
96	{
97		.name = "SnapGear BIOS",
98		.offset = 0x007e0000,
99		.size = 0x00020000
100	},
101};
102#endif
103
104static struct map_info nettel_amd_map = {
105	.name = "SnapGear AMD",
106	.size = AMD_WINDOW_MAXSIZE,
107	.bankwidth = AMD_BUSWIDTH,
108};
109
110static struct mtd_partition nettel_amd_partitions[] = {
111	{
112		.name = "SnapGear BIOS config",
113		.offset = 0x000e0000,
114		.size = 0x00010000
115	},
116	{
117		.name = "SnapGear BIOS",
118		.offset = 0x000f0000,
119		.size = 0x00010000
120	},
121	{
122		.name = "SnapGear AMD",
123		.offset = 0
124	},
125	{
126		.name = "SnapGear high BIOS",
127		.offset = 0x001f0000,
128		.size = 0x00010000
129	}
130};
131
132#define NUM_AMD_PARTITIONS ARRAY_SIZE(nettel_amd_partitions)
133
134/****************************************************************************/
135
136#ifdef CONFIG_MTD_CFI_INTELEXT
137
138/*
139 *	Set the Intel flash back to read mode since some old boot
140 *	loaders don't.
141 */
142static int nettel_reboot_notifier(struct notifier_block *nb, unsigned long val, void *v)
143{
144	struct cfi_private *cfi = nettel_intel_map.fldrv_priv;
145	unsigned long b;
146
147	/* Make sure all FLASH chips are put back into read mode */
148	for (b = 0; (b < nettel_intel_partitions[3].size); b += 0x100000) {
149		cfi_send_gen_cmd(0xff, 0x55, b, &nettel_intel_map, cfi,
150			cfi->device_type, NULL);
151	}
152	return(NOTIFY_OK);
153}
154
155static struct notifier_block nettel_notifier_block = {
156	nettel_reboot_notifier, NULL, 0
157};
158
159#endif
160
161/****************************************************************************/
162
163static int __init nettel_init(void)
164{
165	volatile unsigned long *amdpar;
166	unsigned long amdaddr, maxsize;
167	int num_amd_partitions=0;
168#ifdef CONFIG_MTD_CFI_INTELEXT
169	volatile unsigned long *intel0par, *intel1par;
170	unsigned long orig_bootcspar, orig_romcs1par;
171	unsigned long intel0addr, intel0size;
172	unsigned long intel1addr, intel1size;
173	int intelboot, intel0cs, intel1cs;
174	int num_intel_partitions;
175#endif
176	int rc = 0;
177
178	nettel_mmcrp = (void *) ioremap_nocache(0xfffef000, 4096);
179	if (nettel_mmcrp == NULL) {
180		printk("SNAPGEAR: failed to disable MMCR cache??\n");
181		return(-EIO);
182	}
183
184	/* Set CPU clock to be 33.000MHz */
185	*((unsigned char *) (nettel_mmcrp + 0xc64)) = 0x01;
186
187	amdpar = (volatile unsigned long *) (nettel_mmcrp + 0xc4);
188
189#ifdef CONFIG_MTD_CFI_INTELEXT
190	intelboot = 0;
191	intel0cs = SC520_PAR_ROMCS1;
192	intel0par = (volatile unsigned long *) (nettel_mmcrp + 0xc0);
193	intel1cs = SC520_PAR_ROMCS2;
194	intel1par = (volatile unsigned long *) (nettel_mmcrp + 0xbc);
195
196	/*
197	 *	Save the CS settings then ensure ROMCS1 and ROMCS2 are off,
198	 *	otherwise they might clash with where we try to map BOOTCS.
199	 */
200	orig_bootcspar = *amdpar;
201	orig_romcs1par = *intel0par;
202	*intel0par = 0;
203	*intel1par = 0;
204#endif
205
206	/*
207	 *	The first thing to do is determine if we have a separate
208	 *	boot FLASH device. Typically this is a small (1 to 2MB)
209	 *	AMD FLASH part. It seems that device size is about the
210	 *	only way to tell if this is the case...
211	 */
212	amdaddr = 0x20000000;
213	maxsize = AMD_WINDOW_MAXSIZE;
214
215	*amdpar = SC520_PAR(SC520_PAR_BOOTCS, amdaddr, maxsize);
216	__asm__ ("wbinvd");
217
218	nettel_amd_map.phys = amdaddr;
219	nettel_amd_map.virt = ioremap_nocache(amdaddr, maxsize);
220	if (!nettel_amd_map.virt) {
221		printk("SNAPGEAR: failed to ioremap() BOOTCS\n");
222		iounmap(nettel_mmcrp);
223		return(-EIO);
224	}
225	simple_map_init(&nettel_amd_map);
226
227	if ((amd_mtd = do_map_probe("jedec_probe", &nettel_amd_map))) {
228		printk(KERN_NOTICE "SNAPGEAR: AMD flash device size = %dK\n",
229			(int)(amd_mtd->size>>10));
230
231		amd_mtd->owner = THIS_MODULE;
232
233		/* The high BIOS partition is only present for 2MB units */
234		num_amd_partitions = NUM_AMD_PARTITIONS;
235		if (amd_mtd->size < AMD_WINDOW_MAXSIZE)
236			num_amd_partitions--;
237		/* Don't add the partition until after the primary INTEL's */
238
239#ifdef CONFIG_MTD_CFI_INTELEXT
240		/*
241		 *	Map the Intel flash into memory after the AMD
242		 *	It has to start on a multiple of maxsize.
243		 */
244		maxsize = SC520_PAR_TO_SIZE(orig_romcs1par);
245		if (maxsize < (32 * 1024 * 1024))
246			maxsize = (32 * 1024 * 1024);
247		intel0addr = amdaddr + maxsize;
248#endif
249	} else {
250#ifdef CONFIG_MTD_CFI_INTELEXT
251		/* INTEL boot FLASH */
252		intelboot++;
253
254		if (!orig_romcs1par) {
255			intel0cs = SC520_PAR_BOOTCS;
256			intel0par = (volatile unsigned long *)
257				(nettel_mmcrp + 0xc4);
258			intel1cs = SC520_PAR_ROMCS1;
259			intel1par = (volatile unsigned long *)
260				(nettel_mmcrp + 0xc0);
261
262			intel0addr = SC520_PAR_TO_ADDR(orig_bootcspar);
263			maxsize = SC520_PAR_TO_SIZE(orig_bootcspar);
264		} else {
265			/* Kernel base is on ROMCS1, not BOOTCS */
266			intel0cs = SC520_PAR_ROMCS1;
267			intel0par = (volatile unsigned long *)
268				(nettel_mmcrp + 0xc0);
269			intel1cs = SC520_PAR_BOOTCS;
270			intel1par = (volatile unsigned long *)
271				(nettel_mmcrp + 0xc4);
272
273			intel0addr = SC520_PAR_TO_ADDR(orig_romcs1par);
274			maxsize = SC520_PAR_TO_SIZE(orig_romcs1par);
275		}
276
277		/* Destroy useless AMD MTD mapping */
278		amd_mtd = NULL;
279		iounmap(nettel_amd_map.virt);
280		nettel_amd_map.virt = NULL;
281#else
282		/* Only AMD flash supported */
283		rc = -ENXIO;
284		goto out_unmap2;
285#endif
286	}
287
288#ifdef CONFIG_MTD_CFI_INTELEXT
289	/*
290	 *	We have determined the INTEL FLASH configuration, so lets
291	 *	go ahead and probe for them now.
292	 */
293
294	/* Set PAR to the maximum size */
295	if (maxsize < (32 * 1024 * 1024))
296		maxsize = (32 * 1024 * 1024);
297	*intel0par = SC520_PAR(intel0cs, intel0addr, maxsize);
298
299	/* Turn other PAR off so the first probe doesn't find it */
300	*intel1par = 0;
301
302	/* Probe for the size of the first Intel flash */
303	nettel_intel_map.size = maxsize;
304	nettel_intel_map.phys = intel0addr;
305	nettel_intel_map.virt = ioremap_nocache(intel0addr, maxsize);
306	if (!nettel_intel_map.virt) {
307		printk("SNAPGEAR: failed to ioremap() ROMCS1\n");
308		rc = -EIO;
309		goto out_unmap2;
310	}
311	simple_map_init(&nettel_intel_map);
312
313	intel_mtd = do_map_probe("cfi_probe", &nettel_intel_map);
314	if (!intel_mtd) {
315		rc = -ENXIO;
316		goto out_unmap1;
317	}
318
319	/* Set PAR to the detected size */
320	intel0size = intel_mtd->size;
321	*intel0par = SC520_PAR(intel0cs, intel0addr, intel0size);
322
323	/*
324	 *	Map second Intel FLASH right after first. Set its size to the
325	 *	same maxsize used for the first Intel FLASH.
326	 */
327	intel1addr = intel0addr + intel0size;
328	*intel1par = SC520_PAR(intel1cs, intel1addr, maxsize);
329	__asm__ ("wbinvd");
330
331	maxsize += intel0size;
332
333	/* Delete the old map and probe again to do both chips */
334	map_destroy(intel_mtd);
335	intel_mtd = NULL;
336	iounmap(nettel_intel_map.virt);
337
338	nettel_intel_map.size = maxsize;
339	nettel_intel_map.virt = ioremap_nocache(intel0addr, maxsize);
340	if (!nettel_intel_map.virt) {
341		printk("SNAPGEAR: failed to ioremap() ROMCS1/2\n");
342		rc = -EIO;
343		goto out_unmap2;
344	}
345
346	intel_mtd = do_map_probe("cfi_probe", &nettel_intel_map);
347	if (! intel_mtd) {
348		rc = -ENXIO;
349		goto out_unmap1;
350	}
351
352	intel1size = intel_mtd->size - intel0size;
353	if (intel1size > 0) {
354		*intel1par = SC520_PAR(intel1cs, intel1addr, intel1size);
355		__asm__ ("wbinvd");
356	} else {
357		*intel1par = 0;
358	}
359
360	printk(KERN_NOTICE "SNAPGEAR: Intel flash device size = %lldKiB\n",
361	       (unsigned long long)(intel_mtd->size >> 10));
362
363	intel_mtd->owner = THIS_MODULE;
364
365	num_intel_partitions = ARRAY_SIZE(nettel_intel_partitions);
366
367	if (intelboot) {
368		/*
369		 *	Adjust offset and size of last boot partition.
370		 *	Must allow for BIOS region at end of FLASH.
371		 */
372		nettel_intel_partitions[1].size = (intel0size + intel1size) -
373			(1024*1024 + intel_mtd->erasesize);
374		nettel_intel_partitions[3].size = intel0size + intel1size;
375		nettel_intel_partitions[4].offset =
376			(intel0size + intel1size) - intel_mtd->erasesize;
377		nettel_intel_partitions[4].size = intel_mtd->erasesize;
378		nettel_intel_partitions[5].offset =
379			nettel_intel_partitions[4].offset;
380		nettel_intel_partitions[5].size =
381			nettel_intel_partitions[4].size;
382	} else {
383		/* No BIOS regions when AMD boot */
384		num_intel_partitions -= 2;
385	}
386	rc = add_mtd_partitions(intel_mtd, nettel_intel_partitions,
387		num_intel_partitions);
388#endif
389
390	if (amd_mtd) {
391		rc = add_mtd_partitions(amd_mtd, nettel_amd_partitions,
392			num_amd_partitions);
393	}
394
395#ifdef CONFIG_MTD_CFI_INTELEXT
396	register_reboot_notifier(&nettel_notifier_block);
397#endif
398
399	return(rc);
400
401#ifdef CONFIG_MTD_CFI_INTELEXT
402out_unmap1:
403	iounmap(nettel_intel_map.virt);
404#endif
405
406out_unmap2:
407	iounmap(nettel_mmcrp);
408	iounmap(nettel_amd_map.virt);
409
410	return(rc);
411
412}
413
414/****************************************************************************/
415
416static void __exit nettel_cleanup(void)
417{
418#ifdef CONFIG_MTD_CFI_INTELEXT
419	unregister_reboot_notifier(&nettel_notifier_block);
420#endif
421	if (amd_mtd) {
422		del_mtd_partitions(amd_mtd);
423		map_destroy(amd_mtd);
424	}
425	if (nettel_mmcrp) {
426		iounmap(nettel_mmcrp);
427		nettel_mmcrp = NULL;
428	}
429	if (nettel_amd_map.virt) {
430		iounmap(nettel_amd_map.virt);
431		nettel_amd_map.virt = NULL;
432	}
433#ifdef CONFIG_MTD_CFI_INTELEXT
434	if (intel_mtd) {
435		del_mtd_partitions(intel_mtd);
436		map_destroy(intel_mtd);
437	}
438	if (nettel_intel_map.virt) {
439		iounmap(nettel_intel_map.virt);
440		nettel_intel_map.virt = NULL;
441	}
442#endif
443}
444
445/****************************************************************************/
446
447module_init(nettel_init);
448module_exit(nettel_cleanup);
449
450MODULE_LICENSE("GPL");
451MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");
452MODULE_DESCRIPTION("SnapGear/SecureEdge FLASH support");
453
454/****************************************************************************/
455