/*
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* intel-mid.c: Intel MID platform setup code
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*
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* (C) Copyright 2008, 2012 Intel Corporation
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* Author: Jacob Pan (jacob.jun.pan@intel.com)
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* Author: Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; version 2
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* of the License.
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*/
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#define pr_fmt(fmt) "intel_mid: " fmt
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/regulator/machine.h>
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#include <linux/scatterlist.h>
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#include <linux/sfi.h>
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#include <linux/irq.h>
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#include <linux/export.h>
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#include <linux/notifier.h>
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#include <asm/setup.h>
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#include <asm/mpspec_def.h>
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#include <asm/hw_irq.h>
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#include <asm/apic.h>
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#include <asm/io_apic.h>
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#include <asm/intel-mid.h>
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#include <asm/intel_mid_vrtc.h>
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#include <asm/io.h>
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#include <asm/i8259.h>
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#include <asm/intel_scu_ipc.h>
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#include <asm/apb_timer.h>
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#include <asm/reboot.h>
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/*
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* the clockevent devices on Moorestown/Medfield can be APBT or LAPIC clock,
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* cmdline option x86_intel_mid_timer can be used to override the configuration
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* to prefer one or the other.
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* at runtime, there are basically three timer configurations:
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* 1. per cpu apbt clock only
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* 2. per cpu always-on lapic clocks only, this is Penwell/Medfield only
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* 3. per cpu lapic clock (C3STOP) and one apbt clock, with broadcast.
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*
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* by default (without cmdline option), platform code first detects cpu type
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* to see if we are on lincroft or penwell, then set up both lapic or apbt
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* clocks accordingly.
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* i.e. by default, medfield uses configuration #2, moorestown uses #1.
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* config #3 is supported but not recommended on medfield.
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*
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* rating and feature summary:
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* lapic (with C3STOP) --------- 100
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* apbt (always-on) ------------ 110
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* lapic (always-on,ARAT) ------ 150
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*/
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enum intel_mid_timer_options intel_mid_timer_options;
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enum intel_mid_cpu_type __intel_mid_cpu_chip;
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EXPORT_SYMBOL_GPL(__intel_mid_cpu_chip);
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static void intel_mid_power_off(void)
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{
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/* Shut down South Complex via PWRMU */
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intel_mid_pwr_power_off();
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/* Only for Tangier, the rest will ignore this command */
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intel_scu_ipc_simple_command(IPCMSG_COLD_OFF, 1);
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};
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static void intel_mid_reboot(void)
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{
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intel_scu_ipc_simple_command(IPCMSG_COLD_RESET, 0);
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}
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static void __init intel_mid_setup_bp_timer(void)
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{
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apbt_time_init();
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setup_boot_APIC_clock();
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}
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static void __init intel_mid_time_init(void)
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{
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sfi_table_parse(SFI_SIG_MTMR, NULL, NULL, sfi_parse_mtmr);
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switch (intel_mid_timer_options) {
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case INTEL_MID_TIMER_APBT_ONLY:
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break;
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case INTEL_MID_TIMER_LAPIC_APBT:
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/* Use apbt and local apic */
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x86_init.timers.setup_percpu_clockev = intel_mid_setup_bp_timer;
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x86_cpuinit.setup_percpu_clockev = setup_secondary_APIC_clock;
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return;
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default:
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if (!boot_cpu_has(X86_FEATURE_ARAT))
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break;
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/* Lapic only, no apbt */
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x86_init.timers.setup_percpu_clockev = setup_boot_APIC_clock;
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x86_cpuinit.setup_percpu_clockev = setup_secondary_APIC_clock;
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return;
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}
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x86_init.timers.setup_percpu_clockev = apbt_time_init;
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}
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static void intel_mid_arch_setup(void)
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{
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if (boot_cpu_data.x86 != 6) {
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pr_err("Unknown Intel MID CPU (%d:%d), default to Penwell\n",
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boot_cpu_data.x86, boot_cpu_data.x86_model);
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__intel_mid_cpu_chip = INTEL_MID_CPU_CHIP_PENWELL;
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goto out;
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}
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switch (boot_cpu_data.x86_model) {
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case 0x35:
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__intel_mid_cpu_chip = INTEL_MID_CPU_CHIP_CLOVERVIEW;
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break;
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case 0x3C:
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case 0x4A:
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__intel_mid_cpu_chip = INTEL_MID_CPU_CHIP_TANGIER;
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x86_platform.legacy.rtc = 1;
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break;
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case 0x27:
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default:
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__intel_mid_cpu_chip = INTEL_MID_CPU_CHIP_PENWELL;
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break;
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}
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out:
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/*
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* Intel MID platforms are using explicitly defined regulators.
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*
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* Let the regulator core know that we do not have any additional
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* regulators left. This lets it substitute unprovided regulators with
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* dummy ones:
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*/
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regulator_has_full_constraints();
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}
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/*
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* Moorestown does not have external NMI source nor port 0x61 to report
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* NMI status. The possible NMI sources are from pmu as a result of NMI
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* watchdog or lock debug. Reading io port 0x61 results in 0xff which
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* misled NMI handler.
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*/
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static unsigned char intel_mid_get_nmi_reason(void)
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{
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return 0;
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}
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/*
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* Moorestown specific x86_init function overrides and early setup
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* calls.
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*/
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void __init x86_intel_mid_early_setup(void)
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{
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x86_init.resources.probe_roms = x86_init_noop;
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x86_init.resources.reserve_resources = x86_init_noop;
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x86_init.timers.timer_init = intel_mid_time_init;
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x86_init.timers.setup_percpu_clockev = x86_init_noop;
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x86_init.timers.wallclock_init = intel_mid_rtc_init;
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x86_init.irqs.pre_vector_init = x86_init_noop;
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x86_init.oem.arch_setup = intel_mid_arch_setup;
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x86_cpuinit.setup_percpu_clockev = apbt_setup_secondary_clock;
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x86_platform.get_nmi_reason = intel_mid_get_nmi_reason;
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x86_init.pci.arch_init = intel_mid_pci_init;
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x86_init.pci.fixup_irqs = x86_init_noop;
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legacy_pic = &null_legacy_pic;
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/*
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* Do nothing for now as everything needed done in
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* x86_intel_mid_early_setup() below.
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*/
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x86_init.acpi.reduced_hw_early_init = x86_init_noop;
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pm_power_off = intel_mid_power_off;
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machine_ops.emergency_restart = intel_mid_reboot;
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/* Avoid searching for BIOS MP tables */
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x86_init.mpparse.find_smp_config = x86_init_noop;
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x86_init.mpparse.get_smp_config = x86_init_uint_noop;
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set_bit(MP_BUS_ISA, mp_bus_not_pci);
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}
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/*
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* if user does not want to use per CPU apb timer, just give it a lower rating
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* than local apic timer and skip the late per cpu timer init.
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*/
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static inline int __init setup_x86_intel_mid_timer(char *arg)
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{
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if (!arg)
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return -EINVAL;
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if (strcmp("apbt_only", arg) == 0)
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intel_mid_timer_options = INTEL_MID_TIMER_APBT_ONLY;
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else if (strcmp("lapic_and_apbt", arg) == 0)
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intel_mid_timer_options = INTEL_MID_TIMER_LAPIC_APBT;
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else {
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pr_warn("X86 INTEL_MID timer option %s not recognised use x86_intel_mid_timer=apbt_only or lapic_and_apbt\n",
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arg);
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return -EINVAL;
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}
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return 0;
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}
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__setup("x86_intel_mid_timer=", setup_x86_intel_mid_timer);
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