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![Sumit Gupta](/assets/img/avatar_default.png)
Add exit hook and remove OPP table when the device gets unregistered.
This will fix the error messages when the CPU FREQ driver module is
removed and then re-inserted. It also fixes these messages while
onlining the first CPU from a policy whose all CPU's were previously
offlined.
debugfs: File 'cpu5' in directory 'opp' already present!
debugfs: File 'cpu6' in directory 'opp' already present!
debugfs: File 'cpu7' in directory 'opp' already present!
Fixes: f41e1442ac
("cpufreq: tegra194: add OPP support and set bandwidth")
Signed-off-by: Sumit Gupta <sumitg@nvidia.com>
[ Viresh: Dropped irrelevant change from it ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
767 lines
21 KiB
C
767 lines
21 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2020 - 2022, NVIDIA CORPORATION. All rights reserved
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*/
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#include <linux/cpu.h>
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#include <linux/cpufreq.h>
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#include <linux/delay.h>
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#include <linux/dma-mapping.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/units.h>
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#include <asm/smp_plat.h>
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#include <soc/tegra/bpmp.h>
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#include <soc/tegra/bpmp-abi.h>
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#define KHZ 1000
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#define REF_CLK_MHZ 408 /* 408 MHz */
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#define US_DELAY 500
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#define CPUFREQ_TBL_STEP_HZ (50 * KHZ * KHZ)
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#define MAX_CNT ~0U
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#define NDIV_MASK 0x1FF
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#define CORE_OFFSET(cpu) (cpu * 8)
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#define CMU_CLKS_BASE 0x2000
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#define SCRATCH_FREQ_CORE_REG(data, cpu) (data->regs + CMU_CLKS_BASE + CORE_OFFSET(cpu))
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#define MMCRAB_CLUSTER_BASE(cl) (0x30000 + (cl * 0x10000))
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#define CLUSTER_ACTMON_BASE(data, cl) \
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(data->regs + (MMCRAB_CLUSTER_BASE(cl) + data->soc->actmon_cntr_base))
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#define CORE_ACTMON_CNTR_REG(data, cl, cpu) (CLUSTER_ACTMON_BASE(data, cl) + CORE_OFFSET(cpu))
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/* cpufreq transisition latency */
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#define TEGRA_CPUFREQ_TRANSITION_LATENCY (300 * 1000) /* unit in nanoseconds */
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struct tegra_cpu_ctr {
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u32 cpu;
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u32 coreclk_cnt, last_coreclk_cnt;
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u32 refclk_cnt, last_refclk_cnt;
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};
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struct read_counters_work {
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struct work_struct work;
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struct tegra_cpu_ctr c;
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};
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struct tegra_cpufreq_ops {
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void (*read_counters)(struct tegra_cpu_ctr *c);
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void (*set_cpu_ndiv)(struct cpufreq_policy *policy, u64 ndiv);
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void (*get_cpu_cluster_id)(u32 cpu, u32 *cpuid, u32 *clusterid);
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int (*get_cpu_ndiv)(u32 cpu, u32 cpuid, u32 clusterid, u64 *ndiv);
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};
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struct tegra_cpufreq_soc {
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struct tegra_cpufreq_ops *ops;
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int maxcpus_per_cluster;
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unsigned int num_clusters;
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phys_addr_t actmon_cntr_base;
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};
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struct tegra194_cpufreq_data {
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void __iomem *regs;
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struct cpufreq_frequency_table **bpmp_luts;
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const struct tegra_cpufreq_soc *soc;
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bool icc_dram_bw_scaling;
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};
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static struct workqueue_struct *read_counters_wq;
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static int tegra_cpufreq_set_bw(struct cpufreq_policy *policy, unsigned long freq_khz)
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{
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struct tegra194_cpufreq_data *data = cpufreq_get_driver_data();
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struct dev_pm_opp *opp;
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struct device *dev;
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int ret;
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dev = get_cpu_device(policy->cpu);
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if (!dev)
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return -ENODEV;
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opp = dev_pm_opp_find_freq_exact(dev, freq_khz * KHZ, true);
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if (IS_ERR(opp))
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return PTR_ERR(opp);
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ret = dev_pm_opp_set_opp(dev, opp);
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if (ret)
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data->icc_dram_bw_scaling = false;
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dev_pm_opp_put(opp);
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return ret;
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}
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static void tegra_get_cpu_mpidr(void *mpidr)
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{
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*((u64 *)mpidr) = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
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}
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static void tegra234_get_cpu_cluster_id(u32 cpu, u32 *cpuid, u32 *clusterid)
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{
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u64 mpidr;
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smp_call_function_single(cpu, tegra_get_cpu_mpidr, &mpidr, true);
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if (cpuid)
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*cpuid = MPIDR_AFFINITY_LEVEL(mpidr, 1);
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if (clusterid)
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*clusterid = MPIDR_AFFINITY_LEVEL(mpidr, 2);
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}
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static int tegra234_get_cpu_ndiv(u32 cpu, u32 cpuid, u32 clusterid, u64 *ndiv)
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{
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struct tegra194_cpufreq_data *data = cpufreq_get_driver_data();
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void __iomem *freq_core_reg;
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u64 mpidr_id;
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/* use physical id to get address of per core frequency register */
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mpidr_id = (clusterid * data->soc->maxcpus_per_cluster) + cpuid;
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freq_core_reg = SCRATCH_FREQ_CORE_REG(data, mpidr_id);
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*ndiv = readl(freq_core_reg) & NDIV_MASK;
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return 0;
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}
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static void tegra234_set_cpu_ndiv(struct cpufreq_policy *policy, u64 ndiv)
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{
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struct tegra194_cpufreq_data *data = cpufreq_get_driver_data();
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void __iomem *freq_core_reg;
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u32 cpu, cpuid, clusterid;
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u64 mpidr_id;
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for_each_cpu_and(cpu, policy->cpus, cpu_online_mask) {
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data->soc->ops->get_cpu_cluster_id(cpu, &cpuid, &clusterid);
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/* use physical id to get address of per core frequency register */
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mpidr_id = (clusterid * data->soc->maxcpus_per_cluster) + cpuid;
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freq_core_reg = SCRATCH_FREQ_CORE_REG(data, mpidr_id);
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writel(ndiv, freq_core_reg);
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}
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}
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/*
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* This register provides access to two counter values with a single
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* 64-bit read. The counter values are used to determine the average
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* actual frequency a core has run at over a period of time.
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* [63:32] PLLP counter: Counts at fixed frequency (408 MHz)
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* [31:0] Core clock counter: Counts on every core clock cycle
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*/
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static void tegra234_read_counters(struct tegra_cpu_ctr *c)
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{
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struct tegra194_cpufreq_data *data = cpufreq_get_driver_data();
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void __iomem *actmon_reg;
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u32 cpuid, clusterid;
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u64 val;
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data->soc->ops->get_cpu_cluster_id(c->cpu, &cpuid, &clusterid);
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actmon_reg = CORE_ACTMON_CNTR_REG(data, clusterid, cpuid);
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val = readq(actmon_reg);
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c->last_refclk_cnt = upper_32_bits(val);
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c->last_coreclk_cnt = lower_32_bits(val);
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udelay(US_DELAY);
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val = readq(actmon_reg);
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c->refclk_cnt = upper_32_bits(val);
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c->coreclk_cnt = lower_32_bits(val);
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}
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static struct tegra_cpufreq_ops tegra234_cpufreq_ops = {
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.read_counters = tegra234_read_counters,
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.get_cpu_cluster_id = tegra234_get_cpu_cluster_id,
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.get_cpu_ndiv = tegra234_get_cpu_ndiv,
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.set_cpu_ndiv = tegra234_set_cpu_ndiv,
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};
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static const struct tegra_cpufreq_soc tegra234_cpufreq_soc = {
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.ops = &tegra234_cpufreq_ops,
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.actmon_cntr_base = 0x9000,
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.maxcpus_per_cluster = 4,
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.num_clusters = 3,
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};
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static const struct tegra_cpufreq_soc tegra239_cpufreq_soc = {
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.ops = &tegra234_cpufreq_ops,
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.actmon_cntr_base = 0x4000,
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.maxcpus_per_cluster = 8,
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.num_clusters = 1,
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};
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static void tegra194_get_cpu_cluster_id(u32 cpu, u32 *cpuid, u32 *clusterid)
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{
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u64 mpidr;
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smp_call_function_single(cpu, tegra_get_cpu_mpidr, &mpidr, true);
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if (cpuid)
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*cpuid = MPIDR_AFFINITY_LEVEL(mpidr, 0);
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if (clusterid)
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*clusterid = MPIDR_AFFINITY_LEVEL(mpidr, 1);
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}
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/*
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* Read per-core Read-only system register NVFREQ_FEEDBACK_EL1.
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* The register provides frequency feedback information to
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* determine the average actual frequency a core has run at over
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* a period of time.
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* [31:0] PLLP counter: Counts at fixed frequency (408 MHz)
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* [63:32] Core clock counter: counts on every core clock cycle
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* where the core is architecturally clocking
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*/
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static u64 read_freq_feedback(void)
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{
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u64 val = 0;
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asm volatile("mrs %0, s3_0_c15_c0_5" : "=r" (val) : );
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return val;
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}
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static inline u32 map_ndiv_to_freq(struct mrq_cpu_ndiv_limits_response
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*nltbl, u16 ndiv)
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{
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return nltbl->ref_clk_hz / KHZ * ndiv / (nltbl->pdiv * nltbl->mdiv);
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}
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static void tegra194_read_counters(struct tegra_cpu_ctr *c)
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{
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u64 val;
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val = read_freq_feedback();
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c->last_refclk_cnt = lower_32_bits(val);
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c->last_coreclk_cnt = upper_32_bits(val);
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udelay(US_DELAY);
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val = read_freq_feedback();
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c->refclk_cnt = lower_32_bits(val);
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c->coreclk_cnt = upper_32_bits(val);
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}
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static void tegra_read_counters(struct work_struct *work)
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{
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struct tegra194_cpufreq_data *data = cpufreq_get_driver_data();
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struct read_counters_work *read_counters_work;
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struct tegra_cpu_ctr *c;
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/*
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* ref_clk_counter(32 bit counter) runs on constant clk,
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* pll_p(408MHz).
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* It will take = 2 ^ 32 / 408 MHz to overflow ref clk counter
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* = 10526880 usec = 10.527 sec to overflow
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*
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* Like wise core_clk_counter(32 bit counter) runs on core clock.
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* It's synchronized to crab_clk (cpu_crab_clk) which runs at
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* freq of cluster. Assuming max cluster clock ~2000MHz,
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* It will take = 2 ^ 32 / 2000 MHz to overflow core clk counter
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* = ~2.147 sec to overflow
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*/
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read_counters_work = container_of(work, struct read_counters_work,
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work);
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c = &read_counters_work->c;
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data->soc->ops->read_counters(c);
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}
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/*
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* Return instantaneous cpu speed
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* Instantaneous freq is calculated as -
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* -Takes sample on every query of getting the freq.
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* - Read core and ref clock counters;
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* - Delay for X us
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* - Read above cycle counters again
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* - Calculates freq by subtracting current and previous counters
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* divided by the delay time or eqv. of ref_clk_counter in delta time
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* - Return Kcycles/second, freq in KHz
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*
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* delta time period = x sec
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* = delta ref_clk_counter / (408 * 10^6) sec
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* freq in Hz = cycles/sec
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* = (delta cycles / x sec
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* = (delta cycles * 408 * 10^6) / delta ref_clk_counter
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* in KHz = (delta cycles * 408 * 10^3) / delta ref_clk_counter
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*
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* @cpu - logical cpu whose freq to be updated
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* Returns freq in KHz on success, 0 if cpu is offline
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*/
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static unsigned int tegra194_calculate_speed(u32 cpu)
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{
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struct read_counters_work read_counters_work;
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struct tegra_cpu_ctr c;
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u32 delta_refcnt;
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u32 delta_ccnt;
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u32 rate_mhz;
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/*
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* udelay() is required to reconstruct cpu frequency over an
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* observation window. Using workqueue to call udelay() with
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* interrupts enabled.
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*/
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read_counters_work.c.cpu = cpu;
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INIT_WORK_ONSTACK(&read_counters_work.work, tegra_read_counters);
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queue_work_on(cpu, read_counters_wq, &read_counters_work.work);
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flush_work(&read_counters_work.work);
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c = read_counters_work.c;
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if (c.coreclk_cnt < c.last_coreclk_cnt)
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delta_ccnt = c.coreclk_cnt + (MAX_CNT - c.last_coreclk_cnt);
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else
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delta_ccnt = c.coreclk_cnt - c.last_coreclk_cnt;
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if (!delta_ccnt)
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return 0;
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/* ref clock is 32 bits */
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if (c.refclk_cnt < c.last_refclk_cnt)
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delta_refcnt = c.refclk_cnt + (MAX_CNT - c.last_refclk_cnt);
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else
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delta_refcnt = c.refclk_cnt - c.last_refclk_cnt;
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if (!delta_refcnt) {
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pr_debug("cpufreq: %d is idle, delta_refcnt: 0\n", cpu);
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return 0;
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}
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rate_mhz = ((unsigned long)(delta_ccnt * REF_CLK_MHZ)) / delta_refcnt;
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return (rate_mhz * KHZ); /* in KHz */
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}
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static void tegra194_get_cpu_ndiv_sysreg(void *ndiv)
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{
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u64 ndiv_val;
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asm volatile("mrs %0, s3_0_c15_c0_4" : "=r" (ndiv_val) : );
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*(u64 *)ndiv = ndiv_val;
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}
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static int tegra194_get_cpu_ndiv(u32 cpu, u32 cpuid, u32 clusterid, u64 *ndiv)
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{
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return smp_call_function_single(cpu, tegra194_get_cpu_ndiv_sysreg, &ndiv, true);
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}
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static void tegra194_set_cpu_ndiv_sysreg(void *data)
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{
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u64 ndiv_val = *(u64 *)data;
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asm volatile("msr s3_0_c15_c0_4, %0" : : "r" (ndiv_val));
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}
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static void tegra194_set_cpu_ndiv(struct cpufreq_policy *policy, u64 ndiv)
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{
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on_each_cpu_mask(policy->cpus, tegra194_set_cpu_ndiv_sysreg, &ndiv, true);
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}
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static unsigned int tegra194_get_speed(u32 cpu)
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{
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struct tegra194_cpufreq_data *data = cpufreq_get_driver_data();
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struct cpufreq_frequency_table *pos;
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u32 cpuid, clusterid;
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unsigned int rate;
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u64 ndiv;
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int ret;
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data->soc->ops->get_cpu_cluster_id(cpu, &cpuid, &clusterid);
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/* reconstruct actual cpu freq using counters */
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rate = tegra194_calculate_speed(cpu);
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/* get last written ndiv value */
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ret = data->soc->ops->get_cpu_ndiv(cpu, cpuid, clusterid, &ndiv);
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if (WARN_ON_ONCE(ret))
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return rate;
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/*
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* If the reconstructed frequency has acceptable delta from
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* the last written value, then return freq corresponding
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* to the last written ndiv value from freq_table. This is
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* done to return consistent value.
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*/
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cpufreq_for_each_valid_entry(pos, data->bpmp_luts[clusterid]) {
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if (pos->driver_data != ndiv)
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continue;
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if (abs(pos->frequency - rate) > 115200) {
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pr_warn("cpufreq: cpu%d,cur:%u,set:%u,set ndiv:%llu\n",
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cpu, rate, pos->frequency, ndiv);
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} else {
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rate = pos->frequency;
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}
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break;
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}
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return rate;
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}
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static int tegra_cpufreq_init_cpufreq_table(struct cpufreq_policy *policy,
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struct cpufreq_frequency_table *bpmp_lut,
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struct cpufreq_frequency_table **opp_table)
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{
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struct tegra194_cpufreq_data *data = cpufreq_get_driver_data();
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struct cpufreq_frequency_table *freq_table = NULL;
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struct cpufreq_frequency_table *pos;
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struct device *cpu_dev;
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struct dev_pm_opp *opp;
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unsigned long rate;
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int ret, max_opps;
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int j = 0;
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cpu_dev = get_cpu_device(policy->cpu);
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if (!cpu_dev) {
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pr_err("%s: failed to get cpu%d device\n", __func__, policy->cpu);
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return -ENODEV;
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}
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/* Initialize OPP table mentioned in operating-points-v2 property in DT */
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ret = dev_pm_opp_of_add_table_indexed(cpu_dev, 0);
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if (!ret) {
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max_opps = dev_pm_opp_get_opp_count(cpu_dev);
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if (max_opps <= 0) {
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dev_err(cpu_dev, "Failed to add OPPs\n");
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return max_opps;
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}
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/* Disable all opps and cross-validate against LUT later */
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for (rate = 0; ; rate++) {
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opp = dev_pm_opp_find_freq_ceil(cpu_dev, &rate);
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if (IS_ERR(opp))
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break;
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dev_pm_opp_put(opp);
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dev_pm_opp_disable(cpu_dev, rate);
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}
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} else {
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dev_err(cpu_dev, "Invalid or empty opp table in device tree\n");
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data->icc_dram_bw_scaling = false;
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return ret;
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}
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freq_table = kcalloc((max_opps + 1), sizeof(*freq_table), GFP_KERNEL);
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if (!freq_table)
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return -ENOMEM;
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/*
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* Cross check the frequencies from BPMP-FW LUT against the OPP's present in DT.
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* Enable only those DT OPP's which are present in LUT also.
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*/
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cpufreq_for_each_valid_entry(pos, bpmp_lut) {
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opp = dev_pm_opp_find_freq_exact(cpu_dev, pos->frequency * KHZ, false);
|
|
if (IS_ERR(opp))
|
|
continue;
|
|
|
|
ret = dev_pm_opp_enable(cpu_dev, pos->frequency * KHZ);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
freq_table[j].driver_data = pos->driver_data;
|
|
freq_table[j].frequency = pos->frequency;
|
|
j++;
|
|
}
|
|
|
|
freq_table[j].driver_data = pos->driver_data;
|
|
freq_table[j].frequency = CPUFREQ_TABLE_END;
|
|
|
|
*opp_table = &freq_table[0];
|
|
|
|
dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int tegra194_cpufreq_init(struct cpufreq_policy *policy)
|
|
{
|
|
struct tegra194_cpufreq_data *data = cpufreq_get_driver_data();
|
|
int maxcpus_per_cluster = data->soc->maxcpus_per_cluster;
|
|
struct cpufreq_frequency_table *freq_table;
|
|
struct cpufreq_frequency_table *bpmp_lut;
|
|
u32 start_cpu, cpu;
|
|
u32 clusterid;
|
|
int ret;
|
|
|
|
data->soc->ops->get_cpu_cluster_id(policy->cpu, NULL, &clusterid);
|
|
if (clusterid >= data->soc->num_clusters || !data->bpmp_luts[clusterid])
|
|
return -EINVAL;
|
|
|
|
start_cpu = rounddown(policy->cpu, maxcpus_per_cluster);
|
|
/* set same policy for all cpus in a cluster */
|
|
for (cpu = start_cpu; cpu < (start_cpu + maxcpus_per_cluster); cpu++) {
|
|
if (cpu_possible(cpu))
|
|
cpumask_set_cpu(cpu, policy->cpus);
|
|
}
|
|
policy->cpuinfo.transition_latency = TEGRA_CPUFREQ_TRANSITION_LATENCY;
|
|
|
|
bpmp_lut = data->bpmp_luts[clusterid];
|
|
|
|
if (data->icc_dram_bw_scaling) {
|
|
ret = tegra_cpufreq_init_cpufreq_table(policy, bpmp_lut, &freq_table);
|
|
if (!ret) {
|
|
policy->freq_table = freq_table;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
data->icc_dram_bw_scaling = false;
|
|
policy->freq_table = bpmp_lut;
|
|
pr_info("OPP tables missing from DT, EMC frequency scaling disabled\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tegra194_cpufreq_online(struct cpufreq_policy *policy)
|
|
{
|
|
/* We did light-weight tear down earlier, nothing to do here */
|
|
return 0;
|
|
}
|
|
|
|
static int tegra194_cpufreq_offline(struct cpufreq_policy *policy)
|
|
{
|
|
/*
|
|
* Preserve policy->driver_data and don't free resources on light-weight
|
|
* tear down.
|
|
*/
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tegra194_cpufreq_exit(struct cpufreq_policy *policy)
|
|
{
|
|
struct device *cpu_dev = get_cpu_device(policy->cpu);
|
|
|
|
dev_pm_opp_remove_all_dynamic(cpu_dev);
|
|
dev_pm_opp_of_cpumask_remove_table(policy->related_cpus);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tegra194_cpufreq_set_target(struct cpufreq_policy *policy,
|
|
unsigned int index)
|
|
{
|
|
struct cpufreq_frequency_table *tbl = policy->freq_table + index;
|
|
struct tegra194_cpufreq_data *data = cpufreq_get_driver_data();
|
|
|
|
/*
|
|
* Each core writes frequency in per core register. Then both cores
|
|
* in a cluster run at same frequency which is the maximum frequency
|
|
* request out of the values requested by both cores in that cluster.
|
|
*/
|
|
data->soc->ops->set_cpu_ndiv(policy, (u64)tbl->driver_data);
|
|
|
|
if (data->icc_dram_bw_scaling)
|
|
tegra_cpufreq_set_bw(policy, tbl->frequency);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct cpufreq_driver tegra194_cpufreq_driver = {
|
|
.name = "tegra194",
|
|
.flags = CPUFREQ_CONST_LOOPS | CPUFREQ_NEED_INITIAL_FREQ_CHECK |
|
|
CPUFREQ_IS_COOLING_DEV,
|
|
.verify = cpufreq_generic_frequency_table_verify,
|
|
.target_index = tegra194_cpufreq_set_target,
|
|
.get = tegra194_get_speed,
|
|
.init = tegra194_cpufreq_init,
|
|
.exit = tegra194_cpufreq_exit,
|
|
.online = tegra194_cpufreq_online,
|
|
.offline = tegra194_cpufreq_offline,
|
|
.attr = cpufreq_generic_attr,
|
|
};
|
|
|
|
static struct tegra_cpufreq_ops tegra194_cpufreq_ops = {
|
|
.read_counters = tegra194_read_counters,
|
|
.get_cpu_cluster_id = tegra194_get_cpu_cluster_id,
|
|
.get_cpu_ndiv = tegra194_get_cpu_ndiv,
|
|
.set_cpu_ndiv = tegra194_set_cpu_ndiv,
|
|
};
|
|
|
|
static const struct tegra_cpufreq_soc tegra194_cpufreq_soc = {
|
|
.ops = &tegra194_cpufreq_ops,
|
|
.maxcpus_per_cluster = 2,
|
|
.num_clusters = 4,
|
|
};
|
|
|
|
static void tegra194_cpufreq_free_resources(void)
|
|
{
|
|
destroy_workqueue(read_counters_wq);
|
|
}
|
|
|
|
static struct cpufreq_frequency_table *
|
|
tegra_cpufreq_bpmp_read_lut(struct platform_device *pdev, struct tegra_bpmp *bpmp,
|
|
unsigned int cluster_id)
|
|
{
|
|
struct cpufreq_frequency_table *freq_table;
|
|
struct mrq_cpu_ndiv_limits_response resp;
|
|
unsigned int num_freqs, ndiv, delta_ndiv;
|
|
struct mrq_cpu_ndiv_limits_request req;
|
|
struct tegra_bpmp_message msg;
|
|
u16 freq_table_step_size;
|
|
int err, index;
|
|
|
|
memset(&req, 0, sizeof(req));
|
|
req.cluster_id = cluster_id;
|
|
|
|
memset(&msg, 0, sizeof(msg));
|
|
msg.mrq = MRQ_CPU_NDIV_LIMITS;
|
|
msg.tx.data = &req;
|
|
msg.tx.size = sizeof(req);
|
|
msg.rx.data = &resp;
|
|
msg.rx.size = sizeof(resp);
|
|
|
|
err = tegra_bpmp_transfer(bpmp, &msg);
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
if (msg.rx.ret == -BPMP_EINVAL) {
|
|
/* Cluster not available */
|
|
return NULL;
|
|
}
|
|
if (msg.rx.ret)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
/*
|
|
* Make sure frequency table step is a multiple of mdiv to match
|
|
* vhint table granularity.
|
|
*/
|
|
freq_table_step_size = resp.mdiv *
|
|
DIV_ROUND_UP(CPUFREQ_TBL_STEP_HZ, resp.ref_clk_hz);
|
|
|
|
dev_dbg(&pdev->dev, "cluster %d: frequency table step size: %d\n",
|
|
cluster_id, freq_table_step_size);
|
|
|
|
delta_ndiv = resp.ndiv_max - resp.ndiv_min;
|
|
|
|
if (unlikely(delta_ndiv == 0)) {
|
|
num_freqs = 1;
|
|
} else {
|
|
/* We store both ndiv_min and ndiv_max hence the +1 */
|
|
num_freqs = delta_ndiv / freq_table_step_size + 1;
|
|
}
|
|
|
|
num_freqs += (delta_ndiv % freq_table_step_size) ? 1 : 0;
|
|
|
|
freq_table = devm_kcalloc(&pdev->dev, num_freqs + 1,
|
|
sizeof(*freq_table), GFP_KERNEL);
|
|
if (!freq_table)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
for (index = 0, ndiv = resp.ndiv_min;
|
|
ndiv < resp.ndiv_max;
|
|
index++, ndiv += freq_table_step_size) {
|
|
freq_table[index].driver_data = ndiv;
|
|
freq_table[index].frequency = map_ndiv_to_freq(&resp, ndiv);
|
|
}
|
|
|
|
freq_table[index].driver_data = resp.ndiv_max;
|
|
freq_table[index++].frequency = map_ndiv_to_freq(&resp, resp.ndiv_max);
|
|
freq_table[index].frequency = CPUFREQ_TABLE_END;
|
|
|
|
return freq_table;
|
|
}
|
|
|
|
static int tegra194_cpufreq_probe(struct platform_device *pdev)
|
|
{
|
|
const struct tegra_cpufreq_soc *soc;
|
|
struct tegra194_cpufreq_data *data;
|
|
struct tegra_bpmp *bpmp;
|
|
struct device *cpu_dev;
|
|
int err, i;
|
|
|
|
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
soc = of_device_get_match_data(&pdev->dev);
|
|
|
|
if (soc->ops && soc->maxcpus_per_cluster && soc->num_clusters) {
|
|
data->soc = soc;
|
|
} else {
|
|
dev_err(&pdev->dev, "soc data missing\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
data->bpmp_luts = devm_kcalloc(&pdev->dev, data->soc->num_clusters,
|
|
sizeof(*data->bpmp_luts), GFP_KERNEL);
|
|
if (!data->bpmp_luts)
|
|
return -ENOMEM;
|
|
|
|
if (soc->actmon_cntr_base) {
|
|
/* mmio registers are used for frequency request and re-construction */
|
|
data->regs = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(data->regs))
|
|
return PTR_ERR(data->regs);
|
|
}
|
|
|
|
platform_set_drvdata(pdev, data);
|
|
|
|
bpmp = tegra_bpmp_get(&pdev->dev);
|
|
if (IS_ERR(bpmp))
|
|
return PTR_ERR(bpmp);
|
|
|
|
read_counters_wq = alloc_workqueue("read_counters_wq", __WQ_LEGACY, 1);
|
|
if (!read_counters_wq) {
|
|
dev_err(&pdev->dev, "fail to create_workqueue\n");
|
|
err = -EINVAL;
|
|
goto put_bpmp;
|
|
}
|
|
|
|
for (i = 0; i < data->soc->num_clusters; i++) {
|
|
data->bpmp_luts[i] = tegra_cpufreq_bpmp_read_lut(pdev, bpmp, i);
|
|
if (IS_ERR(data->bpmp_luts[i])) {
|
|
err = PTR_ERR(data->bpmp_luts[i]);
|
|
goto err_free_res;
|
|
}
|
|
}
|
|
|
|
tegra194_cpufreq_driver.driver_data = data;
|
|
|
|
/* Check for optional OPPv2 and interconnect paths on CPU0 to enable ICC scaling */
|
|
cpu_dev = get_cpu_device(0);
|
|
if (!cpu_dev) {
|
|
err = -EPROBE_DEFER;
|
|
goto err_free_res;
|
|
}
|
|
|
|
if (dev_pm_opp_of_get_opp_desc_node(cpu_dev)) {
|
|
err = dev_pm_opp_of_find_icc_paths(cpu_dev, NULL);
|
|
if (!err)
|
|
data->icc_dram_bw_scaling = true;
|
|
}
|
|
|
|
err = cpufreq_register_driver(&tegra194_cpufreq_driver);
|
|
if (!err)
|
|
goto put_bpmp;
|
|
|
|
err_free_res:
|
|
tegra194_cpufreq_free_resources();
|
|
put_bpmp:
|
|
tegra_bpmp_put(bpmp);
|
|
return err;
|
|
}
|
|
|
|
static void tegra194_cpufreq_remove(struct platform_device *pdev)
|
|
{
|
|
cpufreq_unregister_driver(&tegra194_cpufreq_driver);
|
|
tegra194_cpufreq_free_resources();
|
|
}
|
|
|
|
static const struct of_device_id tegra194_cpufreq_of_match[] = {
|
|
{ .compatible = "nvidia,tegra194-ccplex", .data = &tegra194_cpufreq_soc },
|
|
{ .compatible = "nvidia,tegra234-ccplex-cluster", .data = &tegra234_cpufreq_soc },
|
|
{ .compatible = "nvidia,tegra239-ccplex-cluster", .data = &tegra239_cpufreq_soc },
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, tegra194_cpufreq_of_match);
|
|
|
|
static struct platform_driver tegra194_ccplex_driver = {
|
|
.driver = {
|
|
.name = "tegra194-cpufreq",
|
|
.of_match_table = tegra194_cpufreq_of_match,
|
|
},
|
|
.probe = tegra194_cpufreq_probe,
|
|
.remove_new = tegra194_cpufreq_remove,
|
|
};
|
|
module_platform_driver(tegra194_ccplex_driver);
|
|
|
|
MODULE_AUTHOR("Mikko Perttunen <mperttunen@nvidia.com>");
|
|
MODULE_AUTHOR("Sumit Gupta <sumitg@nvidia.com>");
|
|
MODULE_DESCRIPTION("NVIDIA Tegra194 cpufreq driver");
|
|
MODULE_LICENSE("GPL v2");
|