From f7cd2d835e0f17cde2e5cead92be0099d7e92a7c Mon Sep 17 00:00:00 2001 From: Sudeep KarkadaNagesha Date: Tue, 29 Oct 2013 12:18:37 +0000 Subject: ARM: vexpress/TC2: add support for CPU DVFS SPC(Serial Power Controller) on TC2 also controls the CPU performance operating points which is essential to provide CPU DVFS. The M3 microcontroller provides two sets of eight performance values, one set for each cluster (CA15 or CA7). Each of this value contains the frequency(kHz) and voltage(mV) at that performance level. It expects these performance level to be passed through the SPC PERF_LVL registers. This patch adds support to populate these performance levels from M3, build the mapping to CPU OPPs at the boot and then use it to get and set the CPU performance level runtime. Signed-off-by: Sudeep KarkadaNagesha Acked-by: Nicolas Pitre Acked-by: Pawel Moll Acked-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki --- arch/arm/mach-vexpress/Kconfig | 12 ++ arch/arm/mach-vexpress/Makefile | 3 +- arch/arm/mach-vexpress/spc.c | 262 +++++++++++++++++++++++++++++++++++++++- arch/arm/mach-vexpress/spc.h | 2 +- arch/arm/mach-vexpress/tc2_pm.c | 7 +- 5 files changed, 281 insertions(+), 5 deletions(-) (limited to 'arch/arm/mach-vexpress') diff --git a/arch/arm/mach-vexpress/Kconfig b/arch/arm/mach-vexpress/Kconfig index 36579544780..c77170c04fd 100644 --- a/arch/arm/mach-vexpress/Kconfig +++ b/arch/arm/mach-vexpress/Kconfig @@ -66,10 +66,22 @@ config ARCH_VEXPRESS_DCSCB This is needed to provide CPU and cluster power management on RTSM implementing big.LITTLE. +config ARCH_VEXPRESS_SPC + bool "Versatile Express Serial Power Controller (SPC)" + select ARCH_HAS_CPUFREQ + select ARCH_HAS_OPP + select PM_OPP + help + The TC2 (A15x2 A7x3) versatile express core tile integrates a logic + block called Serial Power Controller (SPC) that provides the interface + between the dual cluster test-chip and the M3 microcontroller that + carries out power management. + config ARCH_VEXPRESS_TC2_PM bool "Versatile Express TC2 power management" depends on MCPM select ARM_CCI + select ARCH_VEXPRESS_SPC help Support for CPU and cluster power management on Versatile Express with a TC2 (A15x2 A7x3) big.LITTLE core tile. diff --git a/arch/arm/mach-vexpress/Makefile b/arch/arm/mach-vexpress/Makefile index 505e64ab3ea..0997e0b7494 100644 --- a/arch/arm/mach-vexpress/Makefile +++ b/arch/arm/mach-vexpress/Makefile @@ -8,7 +8,8 @@ obj-y := v2m.o obj-$(CONFIG_ARCH_VEXPRESS_CA9X4) += ct-ca9x4.o obj-$(CONFIG_ARCH_VEXPRESS_DCSCB) += dcscb.o dcscb_setup.o CFLAGS_dcscb.o += -march=armv7-a -obj-$(CONFIG_ARCH_VEXPRESS_TC2_PM) += tc2_pm.o spc.o +obj-$(CONFIG_ARCH_VEXPRESS_SPC) += spc.o +obj-$(CONFIG_ARCH_VEXPRESS_TC2_PM) += tc2_pm.o CFLAGS_tc2_pm.o += -march=armv7-a obj-$(CONFIG_SMP) += platsmp.o obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o diff --git a/arch/arm/mach-vexpress/spc.c b/arch/arm/mach-vexpress/spc.c index eefb029197c..de0ca3615c3 100644 --- a/arch/arm/mach-vexpress/spc.c +++ b/arch/arm/mach-vexpress/spc.c @@ -17,14 +17,27 @@ * GNU General Public License for more details. */ +#include #include +#include #include +#include #include +#include #include #define SPCLOG "vexpress-spc: " +#define PERF_LVL_A15 0x00 +#define PERF_REQ_A15 0x04 +#define PERF_LVL_A7 0x08 +#define PERF_REQ_A7 0x0c +#define COMMS 0x10 +#define COMMS_REQ 0x14 +#define PWC_STATUS 0x18 +#define PWC_FLAG 0x1c + /* SPC wake-up IRQs status and mask */ #define WAKE_INT_MASK 0x24 #define WAKE_INT_RAW 0x28 @@ -36,12 +49,45 @@ #define A15_BX_ADDR0 0x68 #define A7_BX_ADDR0 0x78 +/* SPC system config interface registers */ +#define SYSCFG_WDATA 0x70 +#define SYSCFG_RDATA 0x74 + +/* A15/A7 OPP virtual register base */ +#define A15_PERFVAL_BASE 0xC10 +#define A7_PERFVAL_BASE 0xC30 + +/* Config interface control bits */ +#define SYSCFG_START (1 << 31) +#define SYSCFG_SCC (6 << 20) +#define SYSCFG_STAT (14 << 20) + /* wake-up interrupt masks */ #define GBL_WAKEUP_INT_MSK (0x3 << 10) /* TC2 static dual-cluster configuration */ #define MAX_CLUSTERS 2 +/* + * Even though the SPC takes max 3-5 ms to complete any OPP/COMMS + * operation, the operation could start just before jiffie is about + * to be incremented. So setting timeout value of 20ms = 2jiffies@100Hz + */ +#define TIMEOUT_US 20000 + +#define MAX_OPPS 8 +#define CA15_DVFS 0 +#define CA7_DVFS 1 +#define SPC_SYS_CFG 2 +#define STAT_COMPLETE(type) ((1 << 0) << (type << 2)) +#define STAT_ERR(type) ((1 << 1) << (type << 2)) +#define RESPONSE_MASK(type) (STAT_COMPLETE(type) | STAT_ERR(type)) + +struct ve_spc_opp { + unsigned long freq; + unsigned long u_volt; +}; + struct ve_spc_drvdata { void __iomem *baseaddr; /* @@ -49,6 +95,12 @@ struct ve_spc_drvdata { * It corresponds to A15 processors MPIDR[15:8] bitfield */ u32 a15_clusid; + uint32_t cur_rsp_mask; + uint32_t cur_rsp_stat; + struct semaphore sem; + struct completion done; + struct ve_spc_opp *opps[MAX_CLUSTERS]; + int num_opps[MAX_CLUSTERS]; }; static struct ve_spc_drvdata *info; @@ -157,8 +209,197 @@ void ve_spc_powerdown(u32 cluster, bool enable) writel_relaxed(enable, info->baseaddr + pwdrn_reg); } -int __init ve_spc_init(void __iomem *baseaddr, u32 a15_clusid) +static int ve_spc_get_performance(int cluster, u32 *freq) +{ + struct ve_spc_opp *opps = info->opps[cluster]; + u32 perf_cfg_reg = 0; + u32 perf; + + perf_cfg_reg = cluster_is_a15(cluster) ? PERF_LVL_A15 : PERF_LVL_A7; + + perf = readl_relaxed(info->baseaddr + perf_cfg_reg); + if (perf >= info->num_opps[cluster]) + return -EINVAL; + + opps += perf; + *freq = opps->freq; + + return 0; +} + +/* find closest match to given frequency in OPP table */ +static int ve_spc_round_performance(int cluster, u32 freq) +{ + int idx, max_opp = info->num_opps[cluster]; + struct ve_spc_opp *opps = info->opps[cluster]; + u32 fmin = 0, fmax = ~0, ftmp; + + freq /= 1000; /* OPP entries in kHz */ + for (idx = 0; idx < max_opp; idx++, opps++) { + ftmp = opps->freq; + if (ftmp >= freq) { + if (ftmp <= fmax) + fmax = ftmp; + } else { + if (ftmp >= fmin) + fmin = ftmp; + } + } + if (fmax != ~0) + return fmax * 1000; + else + return fmin * 1000; +} + +static int ve_spc_find_performance_index(int cluster, u32 freq) +{ + int idx, max_opp = info->num_opps[cluster]; + struct ve_spc_opp *opps = info->opps[cluster]; + + for (idx = 0; idx < max_opp; idx++, opps++) + if (opps->freq == freq) + break; + return (idx == max_opp) ? -EINVAL : idx; +} + +static int ve_spc_waitforcompletion(int req_type) +{ + int ret = wait_for_completion_interruptible_timeout( + &info->done, usecs_to_jiffies(TIMEOUT_US)); + if (ret == 0) + ret = -ETIMEDOUT; + else if (ret > 0) + ret = info->cur_rsp_stat & STAT_COMPLETE(req_type) ? 0 : -EIO; + return ret; +} + +static int ve_spc_set_performance(int cluster, u32 freq) +{ + u32 perf_cfg_reg, perf_stat_reg; + int ret, perf, req_type; + + if (cluster_is_a15(cluster)) { + req_type = CA15_DVFS; + perf_cfg_reg = PERF_LVL_A15; + perf_stat_reg = PERF_REQ_A15; + } else { + req_type = CA7_DVFS; + perf_cfg_reg = PERF_LVL_A7; + perf_stat_reg = PERF_REQ_A7; + } + + perf = ve_spc_find_performance_index(cluster, freq); + + if (perf < 0) + return perf; + + if (down_timeout(&info->sem, usecs_to_jiffies(TIMEOUT_US))) + return -ETIME; + + init_completion(&info->done); + info->cur_rsp_mask = RESPONSE_MASK(req_type); + + writel(perf, info->baseaddr + perf_cfg_reg); + ret = ve_spc_waitforcompletion(req_type); + + info->cur_rsp_mask = 0; + up(&info->sem); + + return ret; +} + +static int ve_spc_read_sys_cfg(int func, int offset, uint32_t *data) +{ + int ret; + + if (down_timeout(&info->sem, usecs_to_jiffies(TIMEOUT_US))) + return -ETIME; + + init_completion(&info->done); + info->cur_rsp_mask = RESPONSE_MASK(SPC_SYS_CFG); + + /* Set the control value */ + writel(SYSCFG_START | func | offset >> 2, info->baseaddr + COMMS); + ret = ve_spc_waitforcompletion(SPC_SYS_CFG); + + if (ret == 0) + *data = readl(info->baseaddr + SYSCFG_RDATA); + + info->cur_rsp_mask = 0; + up(&info->sem); + + return ret; +} + +static irqreturn_t ve_spc_irq_handler(int irq, void *data) +{ + struct ve_spc_drvdata *drv_data = data; + uint32_t status = readl_relaxed(drv_data->baseaddr + PWC_STATUS); + + if (info->cur_rsp_mask & status) { + info->cur_rsp_stat = status; + complete(&drv_data->done); + } + + return IRQ_HANDLED; +} + +/* + * +--------------------------+ + * | 31 20 | 19 0 | + * +--------------------------+ + * | u_volt | freq(kHz) | + * +--------------------------+ + */ +#define MULT_FACTOR 20 +#define VOLT_SHIFT 20 +#define FREQ_MASK (0xFFFFF) +static int ve_spc_populate_opps(uint32_t cluster) +{ + uint32_t data = 0, off, ret, idx; + struct ve_spc_opp *opps; + + opps = kzalloc(sizeof(*opps) * MAX_OPPS, GFP_KERNEL); + if (!opps) + return -ENOMEM; + + info->opps[cluster] = opps; + + off = cluster_is_a15(cluster) ? A15_PERFVAL_BASE : A7_PERFVAL_BASE; + for (idx = 0; idx < MAX_OPPS; idx++, off += 4, opps++) { + ret = ve_spc_read_sys_cfg(SYSCFG_SCC, off, &data); + if (!ret) { + opps->freq = (data & FREQ_MASK) * MULT_FACTOR; + opps->u_volt = data >> VOLT_SHIFT; + } else { + break; + } + } + info->num_opps[cluster] = idx; + + return ret; +} + +static int ve_init_opp_table(struct device *cpu_dev) +{ + int cluster = topology_physical_package_id(cpu_dev->id); + int idx, ret = 0, max_opp = info->num_opps[cluster]; + struct ve_spc_opp *opps = info->opps[cluster]; + + for (idx = 0; idx < max_opp; idx++, opps++) { + ret = dev_pm_opp_add(cpu_dev, opps->freq * 1000, opps->u_volt); + if (ret) { + dev_warn(cpu_dev, "failed to add opp %lu %lu\n", + opps->freq, opps->u_volt); + return ret; + } + } + return ret; +} + +int __init ve_spc_init(void __iomem *baseaddr, u32 a15_clusid, int irq) { + int ret; info = kzalloc(sizeof(*info), GFP_KERNEL); if (!info) { pr_err(SPCLOG "unable to allocate mem\n"); @@ -168,6 +409,25 @@ int __init ve_spc_init(void __iomem *baseaddr, u32 a15_clusid) info->baseaddr = baseaddr; info->a15_clusid = a15_clusid; + if (irq <= 0) { + pr_err(SPCLOG "Invalid IRQ %d\n", irq); + kfree(info); + return -EINVAL; + } + + init_completion(&info->done); + + readl_relaxed(info->baseaddr + PWC_STATUS); + + ret = request_irq(irq, ve_spc_irq_handler, IRQF_TRIGGER_HIGH + | IRQF_ONESHOT, "vexpress-spc", info); + if (ret) { + pr_err(SPCLOG "IRQ %d request failed\n", irq); + kfree(info); + return -ENODEV; + } + + sema_init(&info->sem, 1); /* * Multi-cluster systems may need this data when non-coherent, during * cluster power-up/power-down. Make sure driver info reaches main diff --git a/arch/arm/mach-vexpress/spc.h b/arch/arm/mach-vexpress/spc.h index 5f7e4a446a1..dbd44c3720f 100644 --- a/arch/arm/mach-vexpress/spc.h +++ b/arch/arm/mach-vexpress/spc.h @@ -15,7 +15,7 @@ #ifndef __SPC_H_ #define __SPC_H_ -int __init ve_spc_init(void __iomem *base, u32 a15_clusid); +int __init ve_spc_init(void __iomem *base, u32 a15_clusid, int irq); void ve_spc_global_wakeup_irq(bool set); void ve_spc_cpu_wakeup_irq(u32 cluster, u32 cpu, bool set); void ve_spc_set_resume_addr(u32 cluster, u32 cpu, u32 addr); diff --git a/arch/arm/mach-vexpress/tc2_pm.c b/arch/arm/mach-vexpress/tc2_pm.c index e6eb4819291..d38130aba46 100644 --- a/arch/arm/mach-vexpress/tc2_pm.c +++ b/arch/arm/mach-vexpress/tc2_pm.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include #include @@ -311,7 +312,7 @@ static void __naked tc2_pm_power_up_setup(unsigned int affinity_level) static int __init tc2_pm_init(void) { - int ret; + int ret, irq; void __iomem *scc; u32 a15_cluster_id, a7_cluster_id, sys_info; struct device_node *np; @@ -336,13 +337,15 @@ static int __init tc2_pm_init(void) tc2_nr_cpus[a15_cluster_id] = (sys_info >> 16) & 0xf; tc2_nr_cpus[a7_cluster_id] = (sys_info >> 20) & 0xf; + irq = irq_of_parse_and_map(np, 0); + /* * A subset of the SCC registers is also used to communicate * with the SPC (power controller). We need to be able to * drive it very early in the boot process to power up * processors, so we initialize the SPC driver here. */ - ret = ve_spc_init(scc + SPC_BASE, a15_cluster_id); + ret = ve_spc_init(scc + SPC_BASE, a15_cluster_id, irq); if (ret) return ret; -- cgit v1.2.3 From 4d910d5bb56c870e5a737b71d4130ec38dc4faea Mon Sep 17 00:00:00 2001 From: Sudeep KarkadaNagesha Date: Tue, 29 Oct 2013 12:18:38 +0000 Subject: ARM: vexpress/TC2: add cpu clock support On TC2, the cpu clocks are controlled by the external M3 microcontroller and SPC provides the interface between the CPU and the power controller. The generic cpufreq drivers use the clock APIs to get the cpu clocks. This patch add virtual spc clocks for all the cpus to control the cpu operating frequency via the clock framework. Signed-off-by: Sudeep KarkadaNagesha Acked-by: Nicolas Pitre Acked-by: Pawel Moll Acked-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki --- arch/arm/mach-vexpress/spc.c | 102 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 102 insertions(+) (limited to 'arch/arm/mach-vexpress') diff --git a/arch/arm/mach-vexpress/spc.c b/arch/arm/mach-vexpress/spc.c index de0ca3615c3..3532e26c911 100644 --- a/arch/arm/mach-vexpress/spc.c +++ b/arch/arm/mach-vexpress/spc.c @@ -17,6 +17,9 @@ * GNU General Public License for more details. */ +#include +#include +#include #include #include #include @@ -438,3 +441,102 @@ int __init ve_spc_init(void __iomem *baseaddr, u32 a15_clusid, int irq) return 0; } + +struct clk_spc { + struct clk_hw hw; + int cluster; +}; + +#define to_clk_spc(spc) container_of(spc, struct clk_spc, hw) +static unsigned long spc_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct clk_spc *spc = to_clk_spc(hw); + u32 freq; + + if (ve_spc_get_performance(spc->cluster, &freq)) + return -EIO; + + return freq * 1000; +} + +static long spc_round_rate(struct clk_hw *hw, unsigned long drate, + unsigned long *parent_rate) +{ + struct clk_spc *spc = to_clk_spc(hw); + + return ve_spc_round_performance(spc->cluster, drate); +} + +static int spc_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct clk_spc *spc = to_clk_spc(hw); + + return ve_spc_set_performance(spc->cluster, rate / 1000); +} + +static struct clk_ops clk_spc_ops = { + .recalc_rate = spc_recalc_rate, + .round_rate = spc_round_rate, + .set_rate = spc_set_rate, +}; + +static struct clk *ve_spc_clk_register(struct device *cpu_dev) +{ + struct clk_init_data init; + struct clk_spc *spc; + + spc = kzalloc(sizeof(*spc), GFP_KERNEL); + if (!spc) { + pr_err("could not allocate spc clk\n"); + return ERR_PTR(-ENOMEM); + } + + spc->hw.init = &init; + spc->cluster = topology_physical_package_id(cpu_dev->id); + + init.name = dev_name(cpu_dev); + init.ops = &clk_spc_ops; + init.flags = CLK_IS_ROOT | CLK_GET_RATE_NOCACHE; + init.num_parents = 0; + + return devm_clk_register(cpu_dev, &spc->hw); +} + +static int __init ve_spc_clk_init(void) +{ + int cpu; + struct clk *clk; + + if (!info) + return 0; /* Continue only if SPC is initialised */ + + if (ve_spc_populate_opps(0) || ve_spc_populate_opps(1)) { + pr_err("failed to build OPP table\n"); + return -ENODEV; + } + + for_each_possible_cpu(cpu) { + struct device *cpu_dev = get_cpu_device(cpu); + if (!cpu_dev) { + pr_warn("failed to get cpu%d device\n", cpu); + continue; + } + clk = ve_spc_clk_register(cpu_dev); + if (IS_ERR(clk)) { + pr_warn("failed to register cpu%d clock\n", cpu); + continue; + } + if (clk_register_clkdev(clk, NULL, dev_name(cpu_dev))) { + pr_warn("failed to register cpu%d clock lookup\n", cpu); + continue; + } + + if (ve_init_opp_table(cpu_dev)) + pr_warn("failed to initialise cpu%d opp table\n", cpu); + } + + return 0; +} +module_init(ve_spc_clk_init); -- cgit v1.2.3 From 9e941b6f42cc2b0d53011d62d639140c84116f59 Mon Sep 17 00:00:00 2001 From: Sudeep KarkadaNagesha Date: Tue, 29 Oct 2013 12:18:40 +0000 Subject: ARM: vexpress/TC2: register vexpress-spc cpufreq device This patch adds vexpress-spc platform device to enables the vexpress SPC cpufreq interface driver. Signed-off-by: Sudeep KarkadaNagesha Acked-by: Pawel Moll Acked-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki --- arch/arm/mach-vexpress/spc.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'arch/arm/mach-vexpress') diff --git a/arch/arm/mach-vexpress/spc.c b/arch/arm/mach-vexpress/spc.c index 3532e26c911..033d34dcbd3 100644 --- a/arch/arm/mach-vexpress/spc.c +++ b/arch/arm/mach-vexpress/spc.c @@ -24,6 +24,7 @@ #include #include #include +#include #include #include #include @@ -537,6 +538,7 @@ static int __init ve_spc_clk_init(void) pr_warn("failed to initialise cpu%d opp table\n", cpu); } + platform_device_register_simple("vexpress-spc-cpufreq", -1, NULL, 0); return 0; } module_init(ve_spc_clk_init); -- cgit v1.2.3