From bc20aa48bbb3068224a1c91f8332971fdb689fad Mon Sep 17 00:00:00 2001 From: David Cohen Date: Mon, 16 Dec 2013 12:07:38 -0800 Subject: x86, intel-mid: Add Merrifield platform support This code was partially based on Mark Brown's previous work. Signed-off-by: David Cohen Link: http://lkml.kernel.org/r/1387224459-25746-4-git-send-email-david.a.cohen@linux.intel.com Signed-off-by: Fei Yang Cc: Mark F. Brown Cc: Kuppuswamy Sathyanarayanan Signed-off-by: H. Peter Anvin --- arch/x86/platform/intel-mid/mrfl.c | 103 +++++++++++++++++++++++++++++++++++++ 1 file changed, 103 insertions(+) create mode 100644 arch/x86/platform/intel-mid/mrfl.c (limited to 'arch/x86/platform/intel-mid/mrfl.c') diff --git a/arch/x86/platform/intel-mid/mrfl.c b/arch/x86/platform/intel-mid/mrfl.c new file mode 100644 index 000000000000..09d10159e7b7 --- /dev/null +++ b/arch/x86/platform/intel-mid/mrfl.c @@ -0,0 +1,103 @@ +/* + * mrfl.c: Intel Merrifield platform specific setup code + * + * (C) Copyright 2013 Intel Corporation + * + * 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; version 2 + * of the License. + */ + +#include + +#include +#include + +#include "intel_mid_weak_decls.h" + +static unsigned long __init tangier_calibrate_tsc(void) +{ + unsigned long fast_calibrate; + u32 lo, hi, ratio, fsb, bus_freq; + + /* *********************** */ + /* Compute TSC:Ratio * FSB */ + /* *********************** */ + + /* Compute Ratio */ + rdmsr(MSR_PLATFORM_INFO, lo, hi); + pr_debug("IA32 PLATFORM_INFO is 0x%x : %x\n", hi, lo); + + ratio = (lo >> 8) & 0xFF; + pr_debug("ratio is %d\n", ratio); + if (!ratio) { + pr_err("Read a zero ratio, force tsc ratio to 4 ...\n"); + ratio = 4; + } + + /* Compute FSB */ + rdmsr(MSR_FSB_FREQ, lo, hi); + pr_debug("Actual FSB frequency detected by SOC 0x%x : %x\n", + hi, lo); + + bus_freq = lo & 0x7; + pr_debug("bus_freq = 0x%x\n", bus_freq); + + if (bus_freq == 0) + fsb = FSB_FREQ_100SKU; + else if (bus_freq == 1) + fsb = FSB_FREQ_100SKU; + else if (bus_freq == 2) + fsb = FSB_FREQ_133SKU; + else if (bus_freq == 3) + fsb = FSB_FREQ_167SKU; + else if (bus_freq == 4) + fsb = FSB_FREQ_83SKU; + else if (bus_freq == 5) + fsb = FSB_FREQ_400SKU; + else if (bus_freq == 6) + fsb = FSB_FREQ_267SKU; + else if (bus_freq == 7) + fsb = FSB_FREQ_333SKU; + else { + BUG(); + pr_err("Invalid bus_freq! Setting to minimal value!\n"); + fsb = FSB_FREQ_100SKU; + } + + /* TSC = FSB Freq * Resolved HFM Ratio */ + fast_calibrate = ratio * fsb; + pr_debug("calculate tangier tsc %lu KHz\n", fast_calibrate); + + /* ************************************ */ + /* Calculate Local APIC Timer Frequency */ + /* ************************************ */ + lapic_timer_frequency = (fsb * 1000) / HZ; + + pr_debug("Setting lapic_timer_frequency = %d\n", + lapic_timer_frequency); + + /* mark tsc clocksource as reliable */ + set_cpu_cap(&boot_cpu_data, X86_FEATURE_TSC_RELIABLE); + + if (fast_calibrate) + return fast_calibrate; + + return 0; +} + +static void __init tangier_arch_setup(void) +{ + x86_platform.calibrate_tsc = tangier_calibrate_tsc; +} + +/* tangier arch ops */ +static struct intel_mid_ops tangier_ops = { + .arch_setup = tangier_arch_setup, +}; + +void * __cpuinit get_tangier_ops() +{ + return &tangier_ops; +} -- cgit v1.2.3 From 47683f7fe5d2abd71bf08b42060bcf95e0ad668f Mon Sep 17 00:00:00 2001 From: Paul Gortmaker Date: Wed, 22 Jan 2014 12:35:25 -0500 Subject: x86: Don't add new __cpuinit users to Merrifield platform code Commit bc20aa48bbb3068224a1c91f8332971fdb689fad ("x86, intel-mid: Add Merrifield platform support") added new instances of __cpuinit usage. We removed this a couple versions ago; we now want to remove the compat no-op stubs. Introducing new users is not what we want to see at this point in time, as it will break once the stubs are gone. This also fixes an out of sync __init vs. __cpuinit -- as the former is real, and the latter is a no-op; hence it would have been a section mismatch. Cc: Fei Yang Cc: H. Peter Anvin Signed-off-by: Paul Gortmaker Acked-by: David Cohen Link: http://lkml.kernel.org/r/1390412125-19439-1-git-send-email-paul.gortmaker@windriver.com Signed-off-by: H. Peter Anvin --- arch/x86/platform/intel-mid/mrfl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/x86/platform/intel-mid/mrfl.c') diff --git a/arch/x86/platform/intel-mid/mrfl.c b/arch/x86/platform/intel-mid/mrfl.c index 09d10159e7b7..28b636a21887 100644 --- a/arch/x86/platform/intel-mid/mrfl.c +++ b/arch/x86/platform/intel-mid/mrfl.c @@ -97,7 +97,7 @@ static struct intel_mid_ops tangier_ops = { .arch_setup = tangier_arch_setup, }; -void * __cpuinit get_tangier_ops() +void *get_tangier_ops() { return &tangier_ops; } -- cgit v1.2.3 From 48102ca7fb2856dde2c75fbd37db45ba630f2967 Mon Sep 17 00:00:00 2001 From: David Cohen Date: Wed, 22 Jan 2014 14:22:49 -0800 Subject: x86, intel-mid: Add missing 'void' to functions without arguments This patch adds missing 'void' to functions that doesn't receive arguments. Signed-off-by: David Cohen Link: http://lkml.kernel.org/r/1390429369-13761-1-git-send-email-david.a.cohen@linux.intel.com Signed-off-by: H. Peter Anvin --- arch/x86/platform/intel-mid/mrfl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/x86/platform/intel-mid/mrfl.c') diff --git a/arch/x86/platform/intel-mid/mrfl.c b/arch/x86/platform/intel-mid/mrfl.c index 28b636a21887..aaca91753d32 100644 --- a/arch/x86/platform/intel-mid/mrfl.c +++ b/arch/x86/platform/intel-mid/mrfl.c @@ -97,7 +97,7 @@ static struct intel_mid_ops tangier_ops = { .arch_setup = tangier_arch_setup, }; -void *get_tangier_ops() +void *get_tangier_ops(void) { return &tangier_ops; } -- cgit v1.2.3