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/arch/mips/powertv/asic/asic_devices.c

http://github.com/mirrors/linux
C | 549 lines | 344 code | 70 blank | 135 comment | 59 complexity | b2293653e37d5bc237556150e8115a7e MD5 | raw file
  1/*
  2 *
  3 * Description:	 Defines the platform resources for Gaia-based settops.
  4 *
  5 * Copyright (C) 2005-2009 Scientific-Atlanta, Inc.
  6 *
  7 * This program is free software; you can redistribute it and/or modify
  8 * it under the terms of the GNU General Public License as published by
  9 * the Free Software Foundation; either version 2 of the License, or
 10 * (at your option) any later version.
 11 *
 12 * This program is distributed in the hope that it will be useful,
 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 15 * GNU General Public License for more details.
 16 *
 17 * You should have received a copy of the GNU General Public License
 18 * along with this program; if not, write to the Free Software
 19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 20 *
 21 * NOTE: The bootloader allocates persistent memory at an address which is
 22 * 16 MiB below the end of the highest address in KSEG0. All fixed
 23 * address memory reservations must avoid this region.
 24 */
 25
 26#include <linux/device.h>
 27#include <linux/kernel.h>
 28#include <linux/init.h>
 29#include <linux/resource.h>
 30#include <linux/serial_reg.h>
 31#include <linux/io.h>
 32#include <linux/bootmem.h>
 33#include <linux/mm.h>
 34#include <linux/platform_device.h>
 35#include <linux/module.h>
 36#include <asm/page.h>
 37#include <linux/swap.h>
 38#include <linux/highmem.h>
 39#include <linux/dma-mapping.h>
 40
 41#include <asm/mach-powertv/asic.h>
 42#include <asm/mach-powertv/asic_regs.h>
 43#include <asm/mach-powertv/interrupts.h>
 44
 45#ifdef CONFIG_BOOTLOADER_DRIVER
 46#include <asm/mach-powertv/kbldr.h>
 47#endif
 48#include <asm/bootinfo.h>
 49
 50#define BOOTLDRFAMILY(byte1, byte0) (((byte1) << 8) | (byte0))
 51
 52/*
 53 * Forward Prototypes
 54 */
 55static void pmem_setup_resource(void);
 56
 57/*
 58 * Global Variables
 59 */
 60enum asic_type asic;
 61
 62unsigned int platform_features;
 63unsigned int platform_family;
 64struct register_map _asic_register_map;
 65EXPORT_SYMBOL(_asic_register_map);		/* Exported for testing */
 66unsigned long asic_phy_base;
 67unsigned long asic_base;
 68EXPORT_SYMBOL(asic_base);			/* Exported for testing */
 69struct resource *gp_resources;
 70
 71/*
 72 * Don't recommend to use it directly, it is usually used by kernel internally.
 73 * Portable code should be using interfaces such as ioremp, dma_map_single, etc.
 74 */
 75unsigned long phys_to_dma_offset;
 76EXPORT_SYMBOL(phys_to_dma_offset);
 77
 78/*
 79 *
 80 * IO Resource Definition
 81 *
 82 */
 83
 84struct resource asic_resource = {
 85	.name  = "ASIC Resource",
 86	.start = 0,
 87	.end   = ASIC_IO_SIZE,
 88	.flags = IORESOURCE_MEM,
 89};
 90
 91/*
 92 * Allow override of bootloader-specified model
 93 * Returns zero on success, a negative errno value on failure.	This parameter
 94 * allows overriding of the bootloader-specified model.
 95 */
 96static char __initdata cmdline[COMMAND_LINE_SIZE];
 97
 98#define FORCEFAMILY_PARAM	"forcefamily"
 99
100/*
101 * check_forcefamily - check for, and parse, forcefamily command line parameter
102 * @forced_family:	Pointer to two-character array in which to store the
103 *			value of the forcedfamily parameter, if any.
104 */
105static __init int check_forcefamily(unsigned char forced_family[2])
106{
107	const char *p;
108
109	forced_family[0] = '\0';
110	forced_family[1] = '\0';
111
112	/* Check the command line for a forcefamily directive */
113	strncpy(cmdline, arcs_cmdline, COMMAND_LINE_SIZE - 1);
114	p = strstr(cmdline, FORCEFAMILY_PARAM);
115	if (p && (p != cmdline) && (*(p - 1) != ' '))
116		p = strstr(p, " " FORCEFAMILY_PARAM "=");
117
118	if (p) {
119		p += strlen(FORCEFAMILY_PARAM "=");
120
121		if (*p == '\0' || *(p + 1) == '\0' ||
122			(*(p + 2) != '\0' && *(p + 2) != ' '))
123			pr_err(FORCEFAMILY_PARAM " must be exactly two "
124				"characters long, ignoring value\n");
125
126		else {
127			forced_family[0] = *p;
128			forced_family[1] = *(p + 1);
129		}
130	}
131
132	return 0;
133}
134
135/*
136 * platform_set_family - determine major platform family type.
137 *
138 * Returns family type; -1 if none
139 * Returns the family type; -1 if none
140 *
141 */
142static __init noinline void platform_set_family(void)
143{
144	unsigned char forced_family[2];
145	unsigned short bootldr_family;
146
147	if (check_forcefamily(forced_family) == 0)
148		bootldr_family = BOOTLDRFAMILY(forced_family[0],
149			forced_family[1]);
150	else
151		bootldr_family = (unsigned short) BOOTLDRFAMILY(
152			CONFIG_BOOTLOADER_FAMILY[0],
153			CONFIG_BOOTLOADER_FAMILY[1]);
154
155	pr_info("Bootloader Family = 0x%04X\n", bootldr_family);
156
157	switch (bootldr_family) {
158	case BOOTLDRFAMILY('R', '1'):
159		platform_family = FAMILY_1500;
160		break;
161	case BOOTLDRFAMILY('4', '4'):
162		platform_family = FAMILY_4500;
163		break;
164	case BOOTLDRFAMILY('4', '6'):
165		platform_family = FAMILY_4600;
166		break;
167	case BOOTLDRFAMILY('A', '1'):
168		platform_family = FAMILY_4600VZA;
169		break;
170	case BOOTLDRFAMILY('8', '5'):
171		platform_family = FAMILY_8500;
172		break;
173	case BOOTLDRFAMILY('R', '2'):
174		platform_family = FAMILY_8500RNG;
175		break;
176	case BOOTLDRFAMILY('8', '6'):
177		platform_family = FAMILY_8600;
178		break;
179	case BOOTLDRFAMILY('B', '1'):
180		platform_family = FAMILY_8600VZB;
181		break;
182	case BOOTLDRFAMILY('E', '1'):
183		platform_family = FAMILY_1500VZE;
184		break;
185	case BOOTLDRFAMILY('F', '1'):
186		platform_family = FAMILY_1500VZF;
187		break;
188	case BOOTLDRFAMILY('8', '7'):
189		platform_family = FAMILY_8700;
190		break;
191	default:
192		platform_family = -1;
193	}
194}
195
196unsigned int platform_get_family(void)
197{
198	return platform_family;
199}
200EXPORT_SYMBOL(platform_get_family);
201
202/*
203 * platform_get_asic - determine the ASIC type.
204 *
205 * Returns the ASIC type, or ASIC_UNKNOWN if unknown
206 *
207 */
208enum asic_type platform_get_asic(void)
209{
210	return asic;
211}
212EXPORT_SYMBOL(platform_get_asic);
213
214/*
215 * set_register_map - set ASIC register configuration
216 * @phys_base:	Physical address of the base of the ASIC registers
217 * @map:	Description of key ASIC registers
218 */
219static void __init set_register_map(unsigned long phys_base,
220	const struct register_map *map)
221{
222	asic_phy_base = phys_base;
223	_asic_register_map = *map;
224	register_map_virtualize(&_asic_register_map);
225	asic_base = (unsigned long)ioremap_nocache(phys_base, ASIC_IO_SIZE);
226}
227
228/**
229 * configure_platform - configuration based on platform type.
230 */
231void __init configure_platform(void)
232{
233	platform_set_family();
234
235	switch (platform_family) {
236	case FAMILY_1500:
237	case FAMILY_1500VZE:
238	case FAMILY_1500VZF:
239		platform_features = FFS_CAPABLE;
240		asic = ASIC_CALLIOPE;
241		set_register_map(CALLIOPE_IO_BASE, &calliope_register_map);
242
243		if (platform_family == FAMILY_1500VZE) {
244			gp_resources = non_dvr_vze_calliope_resources;
245			pr_info("Platform: 1500/Vz Class E - "
246				"CALLIOPE, NON_DVR_CAPABLE\n");
247		} else if (platform_family == FAMILY_1500VZF) {
248			gp_resources = non_dvr_vzf_calliope_resources;
249			pr_info("Platform: 1500/Vz Class F - "
250				"CALLIOPE, NON_DVR_CAPABLE\n");
251		} else {
252			gp_resources = non_dvr_calliope_resources;
253			pr_info("Platform: 1500/RNG100 - CALLIOPE, "
254				"NON_DVR_CAPABLE\n");
255		}
256		break;
257
258	case FAMILY_4500:
259		platform_features = FFS_CAPABLE | PCIE_CAPABLE |
260			DISPLAY_CAPABLE;
261		asic = ASIC_ZEUS;
262		set_register_map(ZEUS_IO_BASE, &zeus_register_map);
263		gp_resources = non_dvr_zeus_resources;
264
265		pr_info("Platform: 4500 - ZEUS, NON_DVR_CAPABLE\n");
266		break;
267
268	case FAMILY_4600:
269	{
270		unsigned int chipversion = 0;
271
272		/* The settop has PCIE but it isn't used, so don't advertise
273		 * it*/
274		platform_features = FFS_CAPABLE | DISPLAY_CAPABLE;
275
276		/* Cronus and Cronus Lite have the same register map */
277		set_register_map(CRONUS_IO_BASE, &cronus_register_map);
278
279		/* ASIC version will determine if this is a real CronusLite or
280		 * Castrati(Cronus) */
281		chipversion  = asic_read(chipver3) << 24;
282		chipversion |= asic_read(chipver2) << 16;
283		chipversion |= asic_read(chipver1) << 8;
284		chipversion |= asic_read(chipver0);
285
286		if ((chipversion == CRONUS_10) || (chipversion == CRONUS_11))
287			asic = ASIC_CRONUS;
288		else
289			asic = ASIC_CRONUSLITE;
290
291		gp_resources = non_dvr_cronuslite_resources;
292		pr_info("Platform: 4600 - %s, NON_DVR_CAPABLE, "
293			"chipversion=0x%08X\n",
294			(asic == ASIC_CRONUS) ? "CRONUS" : "CRONUS LITE",
295			chipversion);
296		break;
297	}
298	case FAMILY_4600VZA:
299		platform_features = FFS_CAPABLE | DISPLAY_CAPABLE;
300		asic = ASIC_CRONUS;
301		set_register_map(CRONUS_IO_BASE, &cronus_register_map);
302		gp_resources = non_dvr_cronus_resources;
303
304		pr_info("Platform: Vz Class A - CRONUS, NON_DVR_CAPABLE\n");
305		break;
306
307	case FAMILY_8500:
308	case FAMILY_8500RNG:
309		platform_features = DVR_CAPABLE | PCIE_CAPABLE |
310			DISPLAY_CAPABLE;
311		asic = ASIC_ZEUS;
312		set_register_map(ZEUS_IO_BASE, &zeus_register_map);
313		gp_resources = dvr_zeus_resources;
314
315		pr_info("Platform: 8500/RNG200 - ZEUS, DVR_CAPABLE\n");
316		break;
317
318	case FAMILY_8600:
319	case FAMILY_8600VZB:
320		platform_features = DVR_CAPABLE | PCIE_CAPABLE |
321			DISPLAY_CAPABLE;
322		asic = ASIC_CRONUS;
323		set_register_map(CRONUS_IO_BASE, &cronus_register_map);
324		gp_resources = dvr_cronus_resources;
325
326		pr_info("Platform: 8600/Vz Class B - CRONUS, "
327			"DVR_CAPABLE\n");
328		break;
329
330	case FAMILY_8700:
331		platform_features = FFS_CAPABLE | PCIE_CAPABLE;
332		asic = ASIC_GAIA;
333		set_register_map(GAIA_IO_BASE, &gaia_register_map);
334		gp_resources = dvr_gaia_resources;
335
336		pr_info("Platform: 8700 - GAIA, DVR_CAPABLE\n");
337		break;
338
339	default:
340		pr_crit("Platform:  UNKNOWN PLATFORM\n");
341		break;
342	}
343
344	switch (asic) {
345	case ASIC_ZEUS:
346		phys_to_dma_offset = 0x30000000;
347		break;
348	case ASIC_CALLIOPE:
349		phys_to_dma_offset = 0x10000000;
350		break;
351	case ASIC_CRONUSLITE:
352		/* Fall through */
353	case ASIC_CRONUS:
354		/*
355		 * TODO: We suppose 0x10000000 aliases into 0x20000000-
356		 * 0x2XXXXXXX. If 0x10000000 aliases into 0x60000000-
357		 * 0x6XXXXXXX, the offset should be 0x50000000, not 0x10000000.
358		 */
359		phys_to_dma_offset = 0x10000000;
360		break;
361	default:
362		phys_to_dma_offset = 0x00000000;
363		break;
364	}
365}
366
367/*
368 * RESOURCE ALLOCATION
369 *
370 */
371/*
372 * Allocates/reserves the Platform memory resources early in the boot process.
373 * This ignores any resources that are designated IORESOURCE_IO
374 */
375void __init platform_alloc_bootmem(void)
376{
377	int i;
378	int total = 0;
379
380	/* Get persistent memory data from command line before allocating
381	 * resources. This need to happen before normal command line parsing
382	 * has been done */
383	pmem_setup_resource();
384
385	/* Loop through looking for resources that want a particular address */
386	for (i = 0; gp_resources[i].flags != 0; i++) {
387		int size = resource_size(&gp_resources[i]);
388		if ((gp_resources[i].start != 0) &&
389			((gp_resources[i].flags & IORESOURCE_MEM) != 0)) {
390			reserve_bootmem(dma_to_phys(gp_resources[i].start),
391				size, 0);
392			total += resource_size(&gp_resources[i]);
393			pr_info("reserve resource %s at %08x (%u bytes)\n",
394				gp_resources[i].name, gp_resources[i].start,
395				resource_size(&gp_resources[i]));
396		}
397	}
398
399	/* Loop through assigning addresses for those that are left */
400	for (i = 0; gp_resources[i].flags != 0; i++) {
401		int size = resource_size(&gp_resources[i]);
402		if ((gp_resources[i].start == 0) &&
403			((gp_resources[i].flags & IORESOURCE_MEM) != 0)) {
404			void *mem = alloc_bootmem_pages(size);
405
406			if (mem == NULL)
407				pr_err("Unable to allocate bootmem pages "
408					"for %s\n", gp_resources[i].name);
409
410			else {
411				gp_resources[i].start =
412					phys_to_dma(virt_to_phys(mem));
413				gp_resources[i].end =
414					gp_resources[i].start + size - 1;
415				total += size;
416				pr_info("allocate resource %s at %08x "
417						"(%u bytes)\n",
418					gp_resources[i].name,
419					gp_resources[i].start, size);
420			}
421		}
422	}
423
424	pr_info("Total Platform driver memory allocation: 0x%08x\n", total);
425
426	/* indicate resources that are platform I/O related */
427	for (i = 0; gp_resources[i].flags != 0; i++) {
428		if ((gp_resources[i].start != 0) &&
429			((gp_resources[i].flags & IORESOURCE_IO) != 0)) {
430			pr_info("reserved platform resource %s at %08x\n",
431				gp_resources[i].name, gp_resources[i].start);
432		}
433	}
434}
435
436/*
437 *
438 * PERSISTENT MEMORY (PMEM) CONFIGURATION
439 *
440 */
441static unsigned long pmemaddr __initdata;
442
443static int __init early_param_pmemaddr(char *p)
444{
445	pmemaddr = (unsigned long)simple_strtoul(p, NULL, 0);
446	return 0;
447}
448early_param("pmemaddr", early_param_pmemaddr);
449
450static long pmemlen __initdata;
451
452static int __init early_param_pmemlen(char *p)
453{
454/* TODO: we can use this code when and if the bootloader ever changes this */
455#if 0
456	pmemlen = (unsigned long)simple_strtoul(p, NULL, 0);
457#else
458	pmemlen = 0x20000;
459#endif
460	return 0;
461}
462early_param("pmemlen", early_param_pmemlen);
463
464/*
465 * Set up persistent memory. If we were given values, we patch the array of
466 * resources. Otherwise, persistent memory may be allocated anywhere at all.
467 */
468static void __init pmem_setup_resource(void)
469{
470	struct resource *resource;
471	resource = asic_resource_get("DiagPersistentMemory");
472
473	if (resource && pmemaddr && pmemlen) {
474		/* The address provided by bootloader is in kseg0. Convert to
475		 * a bus address. */
476		resource->start = phys_to_dma(pmemaddr - 0x80000000);
477		resource->end = resource->start + pmemlen - 1;
478
479		pr_info("persistent memory: start=0x%x	end=0x%x\n",
480			resource->start, resource->end);
481	}
482}
483
484/*
485 *
486 * RESOURCE ACCESS FUNCTIONS
487 *
488 */
489
490/**
491 * asic_resource_get - retrieves parameters for a platform resource.
492 * @name:	string to match resource
493 *
494 * Returns a pointer to a struct resource corresponding to the given name.
495 *
496 * CANNOT BE NAMED platform_resource_get, which would be the obvious choice,
497 * as this function name is already declared
498 */
499struct resource *asic_resource_get(const char *name)
500{
501	int i;
502
503	for (i = 0; gp_resources[i].flags != 0; i++) {
504		if (strcmp(gp_resources[i].name, name) == 0)
505			return &gp_resources[i];
506	}
507
508	return NULL;
509}
510EXPORT_SYMBOL(asic_resource_get);
511
512/**
513 * platform_release_memory - release pre-allocated memory
514 * @ptr:	pointer to memory to release
515 * @size:	size of resource
516 *
517 * This must only be called for memory allocated or reserved via the boot
518 * memory allocator.
519 */
520void platform_release_memory(void *ptr, int size)
521{
522	free_reserved_area(ptr, ptr + size, -1, NULL);
523}
524EXPORT_SYMBOL(platform_release_memory);
525
526/*
527 *
528 * FEATURE AVAILABILITY FUNCTIONS
529 *
530 */
531int platform_supports_dvr(void)
532{
533	return (platform_features & DVR_CAPABLE) != 0;
534}
535
536int platform_supports_ffs(void)
537{
538	return (platform_features & FFS_CAPABLE) != 0;
539}
540
541int platform_supports_pcie(void)
542{
543	return (platform_features & PCIE_CAPABLE) != 0;
544}
545
546int platform_supports_display(void)
547{
548	return (platform_features & DISPLAY_CAPABLE) != 0;
549}