fsi: Add regmap and refactor sbefifo

Merge series from Eddie James <eajames@linux.ibm.com>:

The SBEFIFO hardware can now be attached over a new I2C endpoint interface
called the I2C Responder (I2CR). In order to use the existing SBEFIFO
driver, add a regmap driver for the FSI bus and an endpoint driver for the
I2CR. Then, refactor the SBEFIFO and OCC drivers to clean up and use the
new regmap driver or the I2CR interface.

This branch just has the regmap change so it can be shared with the FSI
code.

1 files changed, 47 insertions, 86 deletions

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index fc3ebeb0bbe5..6ff73c30769f 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -27,6 +27,7 @@
 #include <linux/pm_qos.h>
 #include <trace/events/power.h>
 
+#include <asm/cpu.h>
 #include <asm/div64.h>
 #include <asm/msr.h>
 #include <asm/cpu_device_id.h>
@@ -280,10 +281,10 @@ static struct cpudata **all_cpu_data;
  * structure is used to store those callbacks.
  */
 struct pstate_funcs {
-	int (*get_max)(void);
-	int (*get_max_physical)(void);
-	int (*get_min)(void);
-	int (*get_turbo)(void);
+	int (*get_max)(int cpu);
+	int (*get_max_physical)(int cpu);
+	int (*get_min)(int cpu);
+	int (*get_turbo)(int cpu);
 	int (*get_scaling)(void);
 	int (*get_cpu_scaling)(int cpu);
 	int (*get_aperf_mperf_shift)(void);
@@ -398,16 +399,6 @@ static int intel_pstate_get_cppc_guaranteed(int cpu)
 
 	return cppc_perf.nominal_perf;
 }
-
-static u32 intel_pstate_cppc_nominal(int cpu)
-{
-	u64 nominal_perf;
-
-	if (cppc_get_nominal_perf(cpu, &nominal_perf))
-		return 0;
-
-	return nominal_perf;
-}
 #else /* CONFIG_ACPI_CPPC_LIB */
 static inline void intel_pstate_set_itmt_prio(int cpu)
 {
@@ -531,35 +522,18 @@ static void intel_pstate_hybrid_hwp_adjust(struct cpudata *cpu)
 {
 	int perf_ctl_max_phys = cpu->pstate.max_pstate_physical;
 	int perf_ctl_scaling = cpu->pstate.perf_ctl_scaling;
-	int perf_ctl_turbo = pstate_funcs.get_turbo();
-	int turbo_freq = perf_ctl_turbo * perf_ctl_scaling;
+	int perf_ctl_turbo = pstate_funcs.get_turbo(cpu->cpu);
 	int scaling = cpu->pstate.scaling;
 
 	pr_debug("CPU%d: perf_ctl_max_phys = %d\n", cpu->cpu, perf_ctl_max_phys);
-	pr_debug("CPU%d: perf_ctl_max = %d\n", cpu->cpu, pstate_funcs.get_max());
 	pr_debug("CPU%d: perf_ctl_turbo = %d\n", cpu->cpu, perf_ctl_turbo);
 	pr_debug("CPU%d: perf_ctl_scaling = %d\n", cpu->cpu, perf_ctl_scaling);
 	pr_debug("CPU%d: HWP_CAP guaranteed = %d\n", cpu->cpu, cpu->pstate.max_pstate);
 	pr_debug("CPU%d: HWP_CAP highest = %d\n", cpu->cpu, cpu->pstate.turbo_pstate);
 	pr_debug("CPU%d: HWP-to-frequency scaling factor: %d\n", cpu->cpu, scaling);
 
-	/*
-	 * If the product of the HWP performance scaling factor and the HWP_CAP
-	 * highest performance is greater than the maximum turbo frequency
-	 * corresponding to the pstate_funcs.get_turbo() return value, the
-	 * scaling factor is too high, so recompute it to make the HWP_CAP
-	 * highest performance correspond to the maximum turbo frequency.
-	 */
-	cpu->pstate.turbo_freq = cpu->pstate.turbo_pstate * scaling;
-	if (turbo_freq < cpu->pstate.turbo_freq) {
-		cpu->pstate.turbo_freq = turbo_freq;
-		scaling = DIV_ROUND_UP(turbo_freq, cpu->pstate.turbo_pstate);
-		cpu->pstate.scaling = scaling;
-
-		pr_debug("CPU%d: refined HWP-to-frequency scaling factor: %d\n",
-			 cpu->cpu, scaling);
-	}
-
+	cpu->pstate.turbo_freq = rounddown(cpu->pstate.turbo_pstate * scaling,
+					   perf_ctl_scaling);
 	cpu->pstate.max_freq = rounddown(cpu->pstate.max_pstate * scaling,
 					 perf_ctl_scaling);
 
@@ -1740,7 +1714,7 @@ static void intel_pstate_hwp_enable(struct cpudata *cpudata)
 	intel_pstate_update_epp_defaults(cpudata);
 }
 
-static int atom_get_min_pstate(void)
+static int atom_get_min_pstate(int not_used)
 {
 	u64 value;
 
@@ -1748,7 +1722,7 @@ static int atom_get_min_pstate(void)
 	return (value >> 8) & 0x7F;
 }
 
-static int atom_get_max_pstate(void)
+static int atom_get_max_pstate(int not_used)
 {
 	u64 value;
 
@@ -1756,7 +1730,7 @@ static int atom_get_max_pstate(void)
 	return (value >> 16) & 0x7F;
 }
 
-static int atom_get_turbo_pstate(void)
+static int atom_get_turbo_pstate(int not_used)
 {
 	u64 value;
 
@@ -1834,23 +1808,23 @@ static void atom_get_vid(struct cpudata *cpudata)
 	cpudata->vid.turbo = value & 0x7f;
 }
 
-static int core_get_min_pstate(void)
+static int core_get_min_pstate(int cpu)
 {
 	u64 value;
 
-	rdmsrl(MSR_PLATFORM_INFO, value);
+	rdmsrl_on_cpu(cpu, MSR_PLATFORM_INFO, &value);
 	return (value >> 40) & 0xFF;
 }
 
-static int core_get_max_pstate_physical(void)
+static int core_get_max_pstate_physical(int cpu)
 {
 	u64 value;
 
-	rdmsrl(MSR_PLATFORM_INFO, value);
+	rdmsrl_on_cpu(cpu, MSR_PLATFORM_INFO, &value);
 	return (value >> 8) & 0xFF;
 }
 
-static int core_get_tdp_ratio(u64 plat_info)
+static int core_get_tdp_ratio(int cpu, u64 plat_info)
 {
 	/* Check how many TDP levels present */
 	if (plat_info & 0x600000000) {
@@ -1860,13 +1834,13 @@ static int core_get_tdp_ratio(u64 plat_info)
 		int err;
 
 		/* Get the TDP level (0, 1, 2) to get ratios */
-		err = rdmsrl_safe(MSR_CONFIG_TDP_CONTROL, &tdp_ctrl);
+		err = rdmsrl_safe_on_cpu(cpu, MSR_CONFIG_TDP_CONTROL, &tdp_ctrl);
 		if (err)
 			return err;
 
 		/* TDP MSR are continuous starting at 0x648 */
 		tdp_msr = MSR_CONFIG_TDP_NOMINAL + (tdp_ctrl & 0x03);
-		err = rdmsrl_safe(tdp_msr, &tdp_ratio);
+		err = rdmsrl_safe_on_cpu(cpu, tdp_msr, &tdp_ratio);
 		if (err)
 			return err;
 
@@ -1883,7 +1857,7 @@ static int core_get_tdp_ratio(u64 plat_info)
 	return -ENXIO;
 }
 
-static int core_get_max_pstate(void)
+static int core_get_max_pstate(int cpu)
 {
 	u64 tar;
 	u64 plat_info;
@@ -1891,10 +1865,10 @@ static int core_get_max_pstate(void)
 	int tdp_ratio;
 	int err;
 
-	rdmsrl(MSR_PLATFORM_INFO, plat_info);
+	rdmsrl_on_cpu(cpu, MSR_PLATFORM_INFO, &plat_info);
 	max_pstate = (plat_info >> 8) & 0xFF;
 
-	tdp_ratio = core_get_tdp_ratio(plat_info);
+	tdp_ratio = core_get_tdp_ratio(cpu, plat_info);
 	if (tdp_ratio <= 0)
 		return max_pstate;
 
@@ -1903,7 +1877,7 @@ static int core_get_max_pstate(void)
 		return tdp_ratio;
 	}
 
-	err = rdmsrl_safe(MSR_TURBO_ACTIVATION_RATIO, &tar);
+	err = rdmsrl_safe_on_cpu(cpu, MSR_TURBO_ACTIVATION_RATIO, &tar);
 	if (!err) {
 		int tar_levels;
 
@@ -1918,13 +1892,13 @@ static int core_get_max_pstate(void)
 	return max_pstate;
 }
 
-static int core_get_turbo_pstate(void)
+static int core_get_turbo_pstate(int cpu)
 {
 	u64 value;
 	int nont, ret;
 
-	rdmsrl(MSR_TURBO_RATIO_LIMIT, value);
-	nont = core_get_max_pstate();
+	rdmsrl_on_cpu(cpu, MSR_TURBO_RATIO_LIMIT, &value);
+	nont = core_get_max_pstate(cpu);
 	ret = (value) & 255;
 	if (ret <= nont)
 		ret = nont;
@@ -1952,50 +1926,37 @@ static int knl_get_aperf_mperf_shift(void)
 	return 10;
 }
 
-static int knl_get_turbo_pstate(void)
+static int knl_get_turbo_pstate(int cpu)
 {
 	u64 value;
 	int nont, ret;
 
-	rdmsrl(MSR_TURBO_RATIO_LIMIT, value);
-	nont = core_get_max_pstate();
+	rdmsrl_on_cpu(cpu, MSR_TURBO_RATIO_LIMIT, &value);
+	nont = core_get_max_pstate(cpu);
 	ret = (((value) >> 8) & 0xFF);
 	if (ret <= nont)
 		ret = nont;
 	return ret;
 }
 
-#ifdef CONFIG_ACPI_CPPC_LIB
-static u32 hybrid_ref_perf;
-
-static int hybrid_get_cpu_scaling(int cpu)
+static void hybrid_get_type(void *data)
 {
-	return DIV_ROUND_UP(core_get_scaling() * hybrid_ref_perf,
-			    intel_pstate_cppc_nominal(cpu));
+	u8 *cpu_type = data;
+
+	*cpu_type = get_this_hybrid_cpu_type();
 }
 
-static void intel_pstate_cppc_set_cpu_scaling(void)
+static int hybrid_get_cpu_scaling(int cpu)
 {
-	u32 min_nominal_perf = U32_MAX;
-	int cpu;
+	u8 cpu_type = 0;
 
-	for_each_present_cpu(cpu) {
-		u32 nominal_perf = intel_pstate_cppc_nominal(cpu);
+	smp_call_function_single(cpu, hybrid_get_type, &cpu_type, 1);
+	/* P-cores have a smaller perf level-to-freqency scaling factor. */
+	if (cpu_type == 0x40)
+		return 78741;
 
-		if (nominal_perf && nominal_perf < min_nominal_perf)
-			min_nominal_perf = nominal_perf;
-	}
-
-	if (min_nominal_perf < U32_MAX) {
-		hybrid_ref_perf = min_nominal_perf;
-		pstate_funcs.get_cpu_scaling = hybrid_get_cpu_scaling;
-	}
+	return core_get_scaling();
 }
-#else
-static inline void intel_pstate_cppc_set_cpu_scaling(void)
-{
-}
-#endif /* CONFIG_ACPI_CPPC_LIB */
 
 static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate)
 {
@@ -2025,10 +1986,10 @@ static void intel_pstate_max_within_limits(struct cpudata *cpu)
 
 static void intel_pstate_get_cpu_pstates(struct cpudata *cpu)
 {
-	int perf_ctl_max_phys = pstate_funcs.get_max_physical();
+	int perf_ctl_max_phys = pstate_funcs.get_max_physical(cpu->cpu);
 	int perf_ctl_scaling = pstate_funcs.get_scaling();
 
-	cpu->pstate.min_pstate = pstate_funcs.get_min();
+	cpu->pstate.min_pstate = pstate_funcs.get_min(cpu->cpu);
 	cpu->pstate.max_pstate_physical = perf_ctl_max_phys;
 	cpu->pstate.perf_ctl_scaling = perf_ctl_scaling;
 
@@ -2044,8 +2005,8 @@ static void intel_pstate_get_cpu_pstates(struct cpudata *cpu)
 		}
 	} else {
 		cpu->pstate.scaling = perf_ctl_scaling;
-		cpu->pstate.max_pstate = pstate_funcs.get_max();
-		cpu->pstate.turbo_pstate = pstate_funcs.get_turbo();
+		cpu->pstate.max_pstate = pstate_funcs.get_max(cpu->cpu);
+		cpu->pstate.turbo_pstate = pstate_funcs.get_turbo(cpu->cpu);
 	}
 
 	if (cpu->pstate.scaling == perf_ctl_scaling) {
@@ -3221,9 +3182,9 @@ static unsigned int force_load __initdata;
 
 static int __init intel_pstate_msrs_not_valid(void)
 {
-	if (!pstate_funcs.get_max() ||
-	    !pstate_funcs.get_min() ||
-	    !pstate_funcs.get_turbo())
+	if (!pstate_funcs.get_max(0) ||
+	    !pstate_funcs.get_min(0) ||
+	    !pstate_funcs.get_turbo(0))
 		return -ENODEV;
 
 	return 0;
@@ -3450,7 +3411,7 @@ static int __init intel_pstate_init(void)
 				default_driver = &intel_pstate;
 
 			if (boot_cpu_has(X86_FEATURE_HYBRID_CPU))
-				intel_pstate_cppc_set_cpu_scaling();
+				pstate_funcs.get_cpu_scaling = hybrid_get_cpu_scaling;
 
 			goto hwp_cpu_matched;
 		}