x86 BIOS interface for RTC on SGI UV (7019cc2d) · Commits · e / devices / android_kernel_teracube_2e

arch/x86/kernel/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -102,6 +102,7 @@ obj-$(CONFIG_OLPC) += olpc.o
		# 64 bit specific files
		ifeq ($(CONFIG_X86_64),y)
		obj-y += genapic_64.o genapic_flat_64.o genx2apic_uv_x.o tlb_uv.o
		obj-y += bios_uv.o
		obj-$(CONFIG_X86_PM_TIMER) += pmtimer_64.o
		obj-$(CONFIG_AUDIT) += audit_64.o

arch/x86/kernel/bios_uv.c

0 → 100644

+48 −0

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		/*
		* BIOS run time interface routines.
		*
		* Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation; either version 2 of the License, or
		* (at your option) any later version.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to the Free Software
		* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
		*/

		#include <asm/uv/bios.h>

		const char *
		x86_bios_strerror(long status)
		{
		const char *str;
		switch (status) {
		case 0: str = "Call completed without error"; break;
		case -1: str = "Not implemented"; break;
		case -2: str = "Invalid argument"; break;
		case -3: str = "Call completed with error"; break;
		default: str = "Unknown BIOS status code"; break;
		}
		return str;
		}

		long
		x86_bios_freq_base(unsigned long which, unsigned long *ticks_per_second,
		unsigned long *drift_info)
		{
		struct uv_bios_retval isrv;

		BIOS_CALL(isrv, BIOS_FREQ_BASE, which, 0, 0, 0, 0, 0, 0);
		*ticks_per_second = isrv.v0;
		*drift_info = isrv.v1;
		return isrv.status;
		}
		EXPORT_SYMBOL_GPL(x86_bios_freq_base);

arch/x86/kernel/genx2apic_uv_x.c

+23 −0

Original line number	Diff line number	Diff line
		@@ -24,6 +24,7 @@
		#include <asm/pgtable.h>
		#include <asm/uv/uv_mmrs.h>
		#include <asm/uv/uv_hub.h>
		#include <asm/uv/bios.h>

		DEFINE_PER_CPU(struct uv_hub_info_s, __uv_hub_info);
		EXPORT_PER_CPU_SYMBOL_GPL(__uv_hub_info);
		@@ -40,6 +41,9 @@ EXPORT_SYMBOL_GPL(uv_cpu_to_blade);
		short uv_possible_blades;
		EXPORT_SYMBOL_GPL(uv_possible_blades);

		unsigned long sn_rtc_cycles_per_second;
		EXPORT_SYMBOL(sn_rtc_cycles_per_second);

		/* Start with all IRQs pointing to boot CPU. IRQ balancing will shift them. */

		static cpumask_t uv_target_cpus(void)
		@@ -272,6 +276,23 @@ static __init void map_mmioh_high(int max_pnode)
		map_high("MMIOH", mmioh.s.base, shift, map_uc);
		}

		static __init void uv_rtc_init(void)
		{
		long status, ticks_per_sec, drift;

		status =
		x86_bios_freq_base(BIOS_FREQ_BASE_REALTIME_CLOCK, &ticks_per_sec,
		&drift);
		if (status != 0 \|\| ticks_per_sec < 100000) {
		printk(KERN_WARNING
		"unable to determine platform RTC clock frequency, "
		"guessing.\n");
		/* BIOS gives wrong value for clock freq. so guess */
		sn_rtc_cycles_per_second = 1000000000000UL / 30000UL;
		} else
		sn_rtc_cycles_per_second = ticks_per_sec;
		}

		static __init void uv_system_init(void)
		{
		union uvh_si_addr_map_config_u m_n_config;
		@@ -326,6 +347,8 @@ static __init void uv_system_init(void)
		gnode_upper = (((unsigned long)node_id.s.node_id) &
		~((1 << n_val) - 1)) << m_val;

		uv_rtc_init();

		for_each_present_cpu(cpu) {
		nid = cpu_to_node(cpu);
		pnode = uv_apicid_to_pnode(per_cpu(x86_cpu_to_apicid, cpu));

include/asm-x86/uv/bios.h

0 → 100644

+68 −0

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		#ifndef _ASM_X86_BIOS_H
		#define _ASM_X86_BIOS_H

		/*
		* BIOS layer definitions.
		*
		* Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation; either version 2 of the License, or
		* (at your option) any later version.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to the Free Software
		* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
		*/

		#include <linux/rtc.h>

		#define BIOS_FREQ_BASE 0x01000001

		enum {
		BIOS_FREQ_BASE_PLATFORM = 0,
		BIOS_FREQ_BASE_INTERVAL_TIMER = 1,
		BIOS_FREQ_BASE_REALTIME_CLOCK = 2
		};

		# define BIOS_CALL(result, a0, a1, a2, a3, a4, a5, a6, a7) \
		do { \
		/* XXX - the real call goes here */ \
		result.status = BIOS_STATUS_UNIMPLEMENTED; \
		isrv.v0 = 0; \
		isrv.v1 = 0; \
		} while (0)

		enum {
		BIOS_STATUS_SUCCESS = 0,
		BIOS_STATUS_UNIMPLEMENTED = -1,
		BIOS_STATUS_EINVAL = -2,
		BIOS_STATUS_ERROR = -3
		};

		struct uv_bios_retval {
		/*
		* A zero status value indicates call completed without error.
		* A negative status value indicates reason of call failure.
		* A positive status value indicates success but an
		* informational value should be printed (e.g., "reboot for
		* change to take effect").
		*/
		s64 status;
		u64 v0;
		u64 v1;
		u64 v2;
		};

		extern long
		x86_bios_freq_base(unsigned long which, unsigned long *ticks_per_second,
		unsigned long *drift_info);
		extern const char *x86_bios_strerror(long status);

		#endif /* _ASM_X86_BIOS_H */