1/*
  2 * BIOS run time interface routines.
  3 *
  4 *  This program is free software; you can redistribute it and/or modify
  5 *  it under the terms of the GNU General Public License as published by
  6 *  the Free Software Foundation; either version 2 of the License, or
  7 *  (at your option) any later version.
  8 *
  9 *  This program is distributed in the hope that it will be useful,
 10 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 11 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12 *  GNU General Public License for more details.
 13 *
 14 *  You should have received a copy of the GNU General Public License
 15 *  along with this program; if not, write to the Free Software
 16 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 17 *
 18 *  Copyright (c) 2008-2009 Silicon Graphics, Inc.  All Rights Reserved.
 19 *  Copyright (c) Russ Anderson <rja@sgi.com>
 20 */
 21
 22#include <linux/efi.h>
 23#include <linux/export.h>
 24#include <asm/efi.h>
 25#include <linux/io.h>
 26#include <asm/uv/bios.h>
 27#include <asm/uv/uv_hub.h>
 28
 29static struct uv_systab uv_systab;
 30
 31s64 uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, u64 a4, u64 a5)
 32{
 33	struct uv_systab *tab = &uv_systab;
 34	s64 ret;
 35
 36	if (!tab->function)
 37		/*
 38		 * BIOS does not support UV systab
 39		 */
 40		return BIOS_STATUS_UNIMPLEMENTED;
 41
 42	ret = efi_call6((void *)__va(tab->function), (u64)which,
 43			a1, a2, a3, a4, a5);
 44	return ret;
 45}
 46EXPORT_SYMBOL_GPL(uv_bios_call);
 47
 48s64 uv_bios_call_irqsave(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
 49					u64 a4, u64 a5)
 50{
 51	unsigned long bios_flags;
 52	s64 ret;
 53
 54	local_irq_save(bios_flags);
 55	ret = uv_bios_call(which, a1, a2, a3, a4, a5);
 56	local_irq_restore(bios_flags);
 57
 58	return ret;
 59}
 60
 61s64 uv_bios_call_reentrant(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
 62					u64 a4, u64 a5)
 63{
 64	s64 ret;
 65
 66	preempt_disable();
 67	ret = uv_bios_call(which, a1, a2, a3, a4, a5);
 68	preempt_enable();
 69
 70	return ret;
 71}
 72
 73
 74long sn_partition_id;
 75EXPORT_SYMBOL_GPL(sn_partition_id);
 76long sn_coherency_id;
 77EXPORT_SYMBOL_GPL(sn_coherency_id);
 78long sn_region_size;
 79EXPORT_SYMBOL_GPL(sn_region_size);
 80long system_serial_number;
 81EXPORT_SYMBOL_GPL(system_serial_number);
 82int uv_type;
 83EXPORT_SYMBOL_GPL(uv_type);
 84
 85
 86s64 uv_bios_get_sn_info(int fc, int *uvtype, long *partid, long *coher,
 87		long *region, long *ssn)
 88{
 89	s64 ret;
 90	u64 v0, v1;
 91	union partition_info_u part;
 92
 93	ret = uv_bios_call_irqsave(UV_BIOS_GET_SN_INFO, fc,
 94				(u64)(&v0), (u64)(&v1), 0, 0);
 95	if (ret != BIOS_STATUS_SUCCESS)
 96		return ret;
 97
 98	part.val = v0;
 99	if (uvtype)
100		*uvtype = part.hub_version;
101	if (partid)
102		*partid = part.partition_id;
103	if (coher)
104		*coher = part.coherence_id;
105	if (region)
106		*region = part.region_size;
107	if (ssn)
108		*ssn = v1;
109	return ret;
110}
111EXPORT_SYMBOL_GPL(uv_bios_get_sn_info);
112
113int
114uv_bios_mq_watchlist_alloc(unsigned long addr, unsigned int mq_size,
115			   unsigned long *intr_mmr_offset)
116{
117	u64 watchlist;
118	s64 ret;
119
120	/*
121	 * bios returns watchlist number or negative error number.
122	 */
123	ret = (int)uv_bios_call_irqsave(UV_BIOS_WATCHLIST_ALLOC, addr,
124			mq_size, (u64)intr_mmr_offset,
125			(u64)&watchlist, 0);
126	if (ret < BIOS_STATUS_SUCCESS)
127		return ret;
128
129	return watchlist;
130}
131EXPORT_SYMBOL_GPL(uv_bios_mq_watchlist_alloc);
132
133int
134uv_bios_mq_watchlist_free(int blade, int watchlist_num)
135{
136	return (int)uv_bios_call_irqsave(UV_BIOS_WATCHLIST_FREE,
137				blade, watchlist_num, 0, 0, 0);
138}
139EXPORT_SYMBOL_GPL(uv_bios_mq_watchlist_free);
140
141s64
142uv_bios_change_memprotect(u64 paddr, u64 len, enum uv_memprotect perms)
143{
144	return uv_bios_call_irqsave(UV_BIOS_MEMPROTECT, paddr, len,
145					perms, 0, 0);
146}
147EXPORT_SYMBOL_GPL(uv_bios_change_memprotect);
148
149s64
150uv_bios_reserved_page_pa(u64 buf, u64 *cookie, u64 *addr, u64 *len)
151{
152	s64 ret;
153
154	ret = uv_bios_call_irqsave(UV_BIOS_GET_PARTITION_ADDR, (u64)cookie,
155					(u64)addr, buf, (u64)len, 0);
156	return ret;
157}
158EXPORT_SYMBOL_GPL(uv_bios_reserved_page_pa);
159
160s64 uv_bios_freq_base(u64 clock_type, u64 *ticks_per_second)
161{
162	return uv_bios_call(UV_BIOS_FREQ_BASE, clock_type,
163			   (u64)ticks_per_second, 0, 0, 0);
164}
165EXPORT_SYMBOL_GPL(uv_bios_freq_base);
166
167/*
168 * uv_bios_set_legacy_vga_target - Set Legacy VGA I/O Target
169 * @decode: true to enable target, false to disable target
170 * @domain: PCI domain number
171 * @bus: PCI bus number
172 *
173 * Returns:
174 *    0: Success
175 *    -EINVAL: Invalid domain or bus number
176 *    -ENOSYS: Capability not available
177 *    -EBUSY: Legacy VGA I/O cannot be retargeted at this time
178 */
179int uv_bios_set_legacy_vga_target(bool decode, int domain, int bus)
180{
181	return uv_bios_call(UV_BIOS_SET_LEGACY_VGA_TARGET,
182				(u64)decode, (u64)domain, (u64)bus, 0, 0);
183}
184EXPORT_SYMBOL_GPL(uv_bios_set_legacy_vga_target);
185
186
187#ifdef CONFIG_EFI
188void uv_bios_init(void)
189{
190	struct uv_systab *tab;
191
192	if ((efi.uv_systab == EFI_INVALID_TABLE_ADDR) ||
193	    (efi.uv_systab == (unsigned long)NULL)) {
194		printk(KERN_CRIT "No EFI UV System Table.\n");
195		uv_systab.function = (unsigned long)NULL;
196		return;
197	}
198
199	tab = (struct uv_systab *)ioremap(efi.uv_systab,
200					sizeof(struct uv_systab));
201	if (strncmp(tab->signature, "UVST", 4) != 0)
202		printk(KERN_ERR "bad signature in UV system table!");
203
204	/*
205	 * Copy table to permanent spot for later use.
206	 */
207	memcpy(&uv_systab, tab, sizeof(struct uv_systab));
208	iounmap(tab);
209
210	printk(KERN_INFO "EFI UV System Table Revision %d\n",
211					uv_systab.revision);
212}
213#else	/* !CONFIG_EFI */
214
215void uv_bios_init(void) { }
216#endif