2 * intel-mid.c: Intel MID platform setup code
4 * (C) Copyright 2008, 2012 Intel Corporation
5 * Author: Jacob Pan (jacob.jun.pan@intel.com)
6 * Author: Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@intel.com>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; version 2
14 #define pr_fmt(fmt) "intel_mid: " fmt
16 #include <linux/init.h>
17 #include <linux/kernel.h>
18 #include <linux/interrupt.h>
19 #include <linux/regulator/machine.h>
20 #include <linux/scatterlist.h>
21 #include <linux/sfi.h>
22 #include <linux/irq.h>
23 #include <linux/export.h>
24 #include <linux/notifier.h>
26 #include <asm/setup.h>
27 #include <asm/mpspec_def.h>
28 #include <asm/hw_irq.h>
30 #include <asm/io_apic.h>
31 #include <asm/intel-mid.h>
32 #include <asm/intel_mid_vrtc.h>
34 #include <asm/i8259.h>
35 #include <asm/intel_scu_ipc.h>
36 #include <asm/apb_timer.h>
37 #include <asm/reboot.h>
39 #include "intel_mid_weak_decls.h"
42 * the clockevent devices on Moorestown/Medfield can be APBT or LAPIC clock,
43 * cmdline option x86_intel_mid_timer can be used to override the configuration
44 * to prefer one or the other.
45 * at runtime, there are basically three timer configurations:
46 * 1. per cpu apbt clock only
47 * 2. per cpu always-on lapic clocks only, this is Penwell/Medfield only
48 * 3. per cpu lapic clock (C3STOP) and one apbt clock, with broadcast.
50 * by default (without cmdline option), platform code first detects cpu type
51 * to see if we are on lincroft or penwell, then set up both lapic or apbt
53 * i.e. by default, medfield uses configuration #2, moorestown uses #1.
54 * config #3 is supported but not recommended on medfield.
56 * rating and feature summary:
57 * lapic (with C3STOP) --------- 100
58 * apbt (always-on) ------------ 110
59 * lapic (always-on,ARAT) ------ 150
62 enum intel_mid_timer_options intel_mid_timer_options;
64 /* intel_mid_ops to store sub arch ops */
65 static struct intel_mid_ops *intel_mid_ops;
66 /* getter function for sub arch ops*/
67 static void *(*get_intel_mid_ops[])(void) = INTEL_MID_OPS_INIT;
68 enum intel_mid_cpu_type __intel_mid_cpu_chip;
69 EXPORT_SYMBOL_GPL(__intel_mid_cpu_chip);
71 static void intel_mid_power_off(void)
73 /* Shut down South Complex via PWRMU */
74 intel_mid_pwr_power_off();
76 /* Only for Tangier, the rest will ignore this command */
77 intel_scu_ipc_simple_command(IPCMSG_COLD_OFF, 1);
80 static void intel_mid_reboot(void)
82 intel_scu_ipc_simple_command(IPCMSG_COLD_BOOT, 0);
85 static unsigned long __init intel_mid_calibrate_tsc(void)
90 static void __init intel_mid_setup_bp_timer(void)
93 setup_boot_APIC_clock();
96 static void __init intel_mid_time_init(void)
98 sfi_table_parse(SFI_SIG_MTMR, NULL, NULL, sfi_parse_mtmr);
100 switch (intel_mid_timer_options) {
101 case INTEL_MID_TIMER_APBT_ONLY:
103 case INTEL_MID_TIMER_LAPIC_APBT:
104 /* Use apbt and local apic */
105 x86_init.timers.setup_percpu_clockev = intel_mid_setup_bp_timer;
106 x86_cpuinit.setup_percpu_clockev = setup_secondary_APIC_clock;
109 if (!boot_cpu_has(X86_FEATURE_ARAT))
111 /* Lapic only, no apbt */
112 x86_init.timers.setup_percpu_clockev = setup_boot_APIC_clock;
113 x86_cpuinit.setup_percpu_clockev = setup_secondary_APIC_clock;
117 x86_init.timers.setup_percpu_clockev = apbt_time_init;
120 static void intel_mid_arch_setup(void)
122 if (boot_cpu_data.x86 != 6) {
123 pr_err("Unknown Intel MID CPU (%d:%d), default to Penwell\n",
124 boot_cpu_data.x86, boot_cpu_data.x86_model);
125 __intel_mid_cpu_chip = INTEL_MID_CPU_CHIP_PENWELL;
129 switch (boot_cpu_data.x86_model) {
131 __intel_mid_cpu_chip = INTEL_MID_CPU_CHIP_CLOVERVIEW;
135 __intel_mid_cpu_chip = INTEL_MID_CPU_CHIP_TANGIER;
139 __intel_mid_cpu_chip = INTEL_MID_CPU_CHIP_PENWELL;
143 if (__intel_mid_cpu_chip < MAX_CPU_OPS(get_intel_mid_ops))
144 intel_mid_ops = get_intel_mid_ops[__intel_mid_cpu_chip]();
146 intel_mid_ops = get_intel_mid_ops[INTEL_MID_CPU_CHIP_PENWELL]();
147 pr_info("ARCH: Unknown SoC, assuming Penwell!\n");
151 if (intel_mid_ops->arch_setup)
152 intel_mid_ops->arch_setup();
155 * Intel MID platforms are using explicitly defined regulators.
157 * Let the regulator core know that we do not have any additional
158 * regulators left. This lets it substitute unprovided regulators with
161 regulator_has_full_constraints();
164 /* MID systems don't have i8042 controller */
165 static int intel_mid_i8042_detect(void)
171 * Moorestown does not have external NMI source nor port 0x61 to report
172 * NMI status. The possible NMI sources are from pmu as a result of NMI
173 * watchdog or lock debug. Reading io port 0x61 results in 0xff which
174 * misled NMI handler.
176 static unsigned char intel_mid_get_nmi_reason(void)
182 * Moorestown specific x86_init function overrides and early setup
185 void __init x86_intel_mid_early_setup(void)
187 x86_init.resources.probe_roms = x86_init_noop;
188 x86_init.resources.reserve_resources = x86_init_noop;
190 x86_init.timers.timer_init = intel_mid_time_init;
191 x86_init.timers.setup_percpu_clockev = x86_init_noop;
193 x86_init.irqs.pre_vector_init = x86_init_noop;
195 x86_init.oem.arch_setup = intel_mid_arch_setup;
197 x86_cpuinit.setup_percpu_clockev = apbt_setup_secondary_clock;
199 x86_platform.calibrate_tsc = intel_mid_calibrate_tsc;
200 x86_platform.i8042_detect = intel_mid_i8042_detect;
201 x86_init.timers.wallclock_init = intel_mid_rtc_init;
202 x86_platform.get_nmi_reason = intel_mid_get_nmi_reason;
204 x86_init.pci.init = intel_mid_pci_init;
205 x86_init.pci.fixup_irqs = x86_init_noop;
207 legacy_pic = &null_legacy_pic;
209 pm_power_off = intel_mid_power_off;
210 machine_ops.emergency_restart = intel_mid_reboot;
212 /* Avoid searching for BIOS MP tables */
213 x86_init.mpparse.find_smp_config = x86_init_noop;
214 x86_init.mpparse.get_smp_config = x86_init_uint_noop;
215 set_bit(MP_BUS_ISA, mp_bus_not_pci);
219 * if user does not want to use per CPU apb timer, just give it a lower rating
220 * than local apic timer and skip the late per cpu timer init.
222 static inline int __init setup_x86_intel_mid_timer(char *arg)
227 if (strcmp("apbt_only", arg) == 0)
228 intel_mid_timer_options = INTEL_MID_TIMER_APBT_ONLY;
229 else if (strcmp("lapic_and_apbt", arg) == 0)
230 intel_mid_timer_options = INTEL_MID_TIMER_LAPIC_APBT;
232 pr_warn("X86 INTEL_MID timer option %s not recognised use x86_intel_mid_timer=apbt_only or lapic_and_apbt\n",
238 __setup("x86_intel_mid_timer=", setup_x86_intel_mid_timer);