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[2607:f8b0:400e:c03::22b]) by mx.google.com with ESMTPS id iu6si1782605pbc.180.2015.02.03.01.30.41 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 03 Feb 2015 01:30:42 -0800 (PST) Received-SPF: pass (google.com: domain of vincent.yang.fujitsu@gmail.com designates 2607:f8b0:400e:c03::22b as permitted sender) client-ip=2607:f8b0:400e:c03::22b; Received: by mail-pa0-f43.google.com with SMTP id eu11so94066459pac.2; Tue, 03 Feb 2015 01:30:41 -0800 (PST) X-Received: by 10.66.249.133 with SMTP id yu5mr36537193pac.116.1422955840949; Tue, 03 Feb 2015 01:30:40 -0800 (PST) Received: from localhost.localdomain ([124.219.7.128]) by mx.google.com with ESMTPSA id ao9sm1548601pac.17.2015.02.03.01.30.37 (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 03 Feb 2015 01:30:39 -0800 (PST) From: Vincent Yang To: linux-arm-kernel@lists.infradead.org Cc: arnd@arndb.de, olof@lixom.net, arm@kernel.org, linux@arm.linux.org.uk, nicolas.pitre@linaro.org, andy.green@linaro.org, patches@linaro.org, jaswinder.singh@linaro.org, Vincent Yang , Tetsuya Nuriya Subject: [PATCH v5 3/7] ARM: MB86S7X: Add MCPM support Date: Tue, 3 Feb 2015 17:30:28 +0800 Message-Id: <1422955828-6671-1-git-send-email-Vincent.Yang@tw.fujitsu.com> X-Mailer: git-send-email 1.9.0 In-Reply-To: <1422955310-6542-1-git-send-email-Vincent.Yang@tw.fujitsu.com> References: <1422955310-6542-1-git-send-email-Vincent.Yang@tw.fujitsu.com> X-Original-Sender: Vincent.Yang.Fujitsu@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of patch+caf_=patchwork-forward=linaro.org@linaro.org designates 2a00:1450:4010:c03::229 as permitted sender) smtp.mail=patch+caf_=patchwork-forward=linaro.org@linaro.org; dkim=pass header.i=@gmail.com; dmarc=pass (p=NONE dis=NONE) header.from=gmail.com Precedence: list Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org List-ID: X-Google-Group-Id: 836684582541 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , From: Jassi Brar The remote firmware(SCB) owns the SMP control. This MCPM driver gets CPU/CLUSTER power up/down done by SCB over mailbox. Signed-off-by: Jassi Brar Signed-off-by: Andy Green Signed-off-by: Vincent Yang Reviewed-by: Nicolas Pitre Signed-off-by: Tetsuya Nuriya --- arch/arm/mach-mb86s7x/Makefile | 4 +- arch/arm/mach-mb86s7x/mcpm.c | 318 +++++++++++++++++++++++++++++++++++++++++ arch/arm/mach-mb86s7x/smc.S | 27 ++++ drivers/soc/mb86s7x/scb_mhu.c | 14 ++ include/soc/mb86s7x/scb_mhu.h | 8 ++ 5 files changed, 370 insertions(+), 1 deletion(-) create mode 100644 arch/arm/mach-mb86s7x/mcpm.c create mode 100644 arch/arm/mach-mb86s7x/smc.S diff --git a/arch/arm/mach-mb86s7x/Makefile b/arch/arm/mach-mb86s7x/Makefile index 97640b6..00e843c 100644 --- a/arch/arm/mach-mb86s7x/Makefile +++ b/arch/arm/mach-mb86s7x/Makefile @@ -1 +1,3 @@ -obj-$(CONFIG_ARCH_MB86S7X) += board.o +obj-$(CONFIG_ARCH_MB86S7X) += board.o mcpm.o smc.o +CFLAGS_smc.o += -march=armv7-a +CFLAGS_mcpm.o += -march=armv7-a diff --git a/arch/arm/mach-mb86s7x/mcpm.c b/arch/arm/mach-mb86s7x/mcpm.c new file mode 100644 index 0000000..17803a6 --- /dev/null +++ b/arch/arm/mach-mb86s7x/mcpm.c @@ -0,0 +1,318 @@ +/* + * arch/arm/mach-mb86s7x/mcpm.c + * Copyright: (C) 2013-2015 Fujitsu Semiconductor Limited + * Copyright: (C) 2015 Linaro Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include +#include +#include +#include +#include + +#define S7X_MAX_CLUSTER 2 +#define S7X_MAX_CPU 2 + +#define MHU_SHM_OFFSET 0x3800 +#define TRAMPOLINE_OFFSET 0x3c00 +#define RESET_OFFSET (TRAMPOLINE_OFFSET + 0x3fc) + +static arch_spinlock_t mb86s7x_pm_lock = __ARCH_SPIN_LOCK_UNLOCKED; +static int mb86s7x_pm_use_count[S7X_MAX_CLUSTER][S7X_MAX_CPU]; + +struct mb86s7x_cpu_gate { + u32 payload_size; + u32 cluster_class; + u32 cluster_id; + u32 cpu_id; +#define SCB_CPU_STATE_OFF 0x0 +#define SCB_CPU_STATE_ON 0x1 +#define SCB_CPU_STATE_SUSP 0x2 + u32 cpu_state; +}; + +static int mb86s7x_pm_power_up(unsigned int cpu, unsigned int cluster) +{ + int ret = 0; + + if (cluster >= S7X_MAX_CLUSTER || cpu >= S7X_MAX_CPU) + return -EINVAL; + + pr_debug("%s: cpu %u cluster %u\n", __func__, cpu, cluster); + + local_irq_disable(); + arch_spin_lock(&mb86s7x_pm_lock); + + mb86s7x_pm_use_count[cluster][cpu]++; + + if (mb86s7x_pm_use_count[cluster][cpu] == 1) { + struct mb86s7x_cpu_gate cmd; + + mb86s7x_set_wficolor(cluster, cpu, AT_WFI_DO_NOTHING); + arch_spin_unlock(&mb86s7x_pm_lock); + local_irq_enable(); + + cmd.payload_size = sizeof(cmd); + cmd.cluster_class = 0; + cmd.cluster_id = cluster; + cmd.cpu_id = cpu; + cmd.cpu_state = SCB_CPU_STATE_ON; + + pr_debug("%s:%d CMD Cl_Class-%u CL_ID-%u CPU_ID-%u STATE-%u}\n", + __func__, __LINE__, cmd.cluster_class, + cmd.cluster_id, cmd.cpu_id, cmd.cpu_state); + + ret = mb86s7x_send_packet(CMD_CPU_CLOCK_GATE_SET_REQ, + &cmd, sizeof(cmd)); + if (ret < 0) { + pr_err("%s:%d failed!\n", __func__, __LINE__); + return ret; + } + + pr_debug("%s:%d REP Cl_Class-%u CL_ID-%u CPU_ID-%u STATE-%u}\n", + __func__, __LINE__, cmd.cluster_class, + cmd.cluster_id, cmd.cpu_id, cmd.cpu_state); + + if (cmd.cpu_state != SCB_CPU_STATE_ON) + return -ENODEV; + } else if (mb86s7x_pm_use_count[cluster][cpu] == 2) { + arch_spin_unlock(&mb86s7x_pm_lock); + local_irq_enable(); + } else { + /* + * The only possible values are: + * 0 = CPU down + * 1 = CPU (still) up + * 2 = CPU requested to be up before it had a chance + * to actually make itself down. + * Any other value is a bug. + */ + BUG(); + } + + return 0; +} + +static void mb86s7x_pm_suspend(u64 ignored) +{ + unsigned int mpidr, cpu, cluster; + bool last_man = false, skip_wfi = false; + + mpidr = read_cpuid_mpidr(); + cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0); + cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1); + + pr_debug("%s: cpu %u cluster %u\n", __func__, cpu, cluster); + __mcpm_cpu_going_down(cpu, cluster); + + arch_spin_lock(&mb86s7x_pm_lock); + BUG_ON(__mcpm_cluster_state(cluster) != CLUSTER_UP); + + mb86s7x_pm_use_count[cluster][cpu]--; + + if (mb86s7x_pm_use_count[cluster][cpu] == 0) { + if (!mb86s7x_pm_use_count[cluster][0] && + !mb86s7x_pm_use_count[cluster][1]) + last_man = true; + mb86s7x_set_wficolor(cluster, cpu, AT_WFI_DO_POWEROFF); + } else if (mb86s7x_pm_use_count[cluster][cpu] == 1) { + skip_wfi = true; /* Overtaken by a power up */ + } else { + BUG(); + } + + if (!skip_wfi) + gic_cpu_if_down(); + + if (last_man && __mcpm_outbound_enter_critical(cpu, cluster)) { + arch_spin_unlock(&mb86s7x_pm_lock); + + if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A15) { + /* + * On the Cortex-A15 we need to disable + * L2 prefetching before flushing the cache. + */ + asm volatile( + "mcr p15, 1, %0, c15, c0, 3\n\t" + "isb\n\t" + "dsb" + : : "r" (0x400)); + } + + v7_exit_coherency_flush(all); + + cci_disable_port_by_cpu(mpidr); + + __mcpm_outbound_leave_critical(cluster, CLUSTER_DOWN); + } else { + arch_spin_unlock(&mb86s7x_pm_lock); + v7_exit_coherency_flush(louis); + } + + __mcpm_cpu_down(cpu, cluster); + + /* Now we are prepared for power-down, do it: */ + if (!skip_wfi) + wfi(); +} + +static void mb86s7x_pm_power_down(void) +{ + mb86s7x_pm_suspend(0); +} + +static int mb86s7x_wait_for_powerdown(unsigned int cpu, unsigned int cluster) +{ + struct mb86s7x_cpu_gate cmd; + int i, ret; + + BUG_ON(cluster >= S7X_MAX_CLUSTER || cpu >= S7X_MAX_CPU); + + cmd.payload_size = sizeof(cmd); + cmd.cluster_class = 0; + cmd.cluster_id = cluster; + cmd.cpu_id = cpu; + cmd.cpu_state = SCB_CPU_STATE_ON; + + for (i = 0; i < 50; i++) { + ret = mb86s7x_send_packet(CMD_CPU_CLOCK_GATE_GET_REQ, + &cmd, sizeof(cmd)); + if (ret < 0) { + pr_err("%s:%d failed to get CPU status\n", + __func__, __LINE__); + return ret; + } + + pr_debug("%s:%d Cl_Class-%u CL_ID-%u CPU_ID-%u STATE-%u\n", + __func__, __LINE__, + cmd.cluster_class, cmd.cluster_id, + cmd.cpu_id, cmd.cpu_state); + + if (cmd.cpu_state == SCB_CPU_STATE_OFF) + return 0; + + msleep(20); + } + + return -ETIMEDOUT; +} + +static void mb86s7x_pm_powered_up(void) +{ + unsigned int mpidr, cpu, cluster; + + mpidr = read_cpuid_mpidr(); + cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0); + cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1); + + arch_spin_lock(&mb86s7x_pm_lock); + if (!mb86s7x_pm_use_count[cluster][cpu]) + mb86s7x_pm_use_count[cluster][cpu] = 1; + arch_spin_unlock(&mb86s7x_pm_lock); +} + +static const struct mcpm_platform_ops mb86s7x_pm_power_ops = { + .power_up = mb86s7x_pm_power_up, + .power_down = mb86s7x_pm_power_down, + .wait_for_powerdown = mb86s7x_wait_for_powerdown, + .suspend = mb86s7x_pm_suspend, + .powered_up = mb86s7x_pm_powered_up, +}; + +/* + * Enable cluster-level coherency, in preparation for turning on the MMU. + */ +static void __naked mb86s7x_pm_power_up_setup(unsigned int affinity_level) +{ + asm volatile ("\n" +" cmp r0, #1\n" +" bxne lr\n" +" b cci_enable_port_for_self"); +} + +static void __init mb86s7x_cache_off(void) +{ + if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A15) { + /* disable L2 prefetching on the Cortex-A15 */ + asm volatile( + "mcr p15, 1, %0, c15, c0, 3\n\t" + "isb\n\t" + "dsb" + : : "r" (0x400)); + } + v7_exit_coherency_flush(all); +} + +struct mb86s7x_scb_version { + u32 payload_size; + u32 version; + u32 config_version; +}; + +static int __init mb86s7x_mcpm_init(void) +{ + unsigned int mpidr, cpu, cluster; + struct mb86s7x_scb_version cmd; + struct device_node *np; + int ret = -ENODEV; + + np = of_find_compatible_node(NULL, NULL, "fujitsu,mb86s70-scb-1.0"); + if (!np || !of_device_is_available(np) || !cci_probed()) + goto exit; + + mpidr = read_cpuid_mpidr(); + cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0); + cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1); + + pr_info("Booting on cpu_%u cluster_%u\n", cpu, cluster); + mb86s7x_pm_use_count[cluster][cpu] = 1; + + /* reset the wfi 'color' for primary cpu */ + mb86s7x_set_wficolor(cluster, cpu, AT_WFI_DO_NOTHING); + + /* Do SMC to set entry address for CPUs coming online */ + mb86s7x_cpu_entry(virt_to_phys(mcpm_entry_point)); + + cmd.payload_size = sizeof(cmd); + cmd.version = 0; + cmd.config_version = 0; + ret = mb86s7x_send_packet(CMD_SCB_CAPABILITY_GET_REQ, + &cmd, sizeof(cmd)); + if (ret < 0) /* non fatal */ + pr_err("%s:%d failed to get SCB version\n", + __func__, __LINE__); + else + pr_err("MB86S7x SCB version 0x%x:0x%x\n", + cmd.version, cmd.config_version); + + ret = mcpm_platform_register(&mb86s7x_pm_power_ops); + if (!ret) + ret = mcpm_sync_init(mb86s7x_pm_power_up_setup); + if (!ret) + ret = mcpm_loopback(mb86s7x_cache_off); /* turn on the CCI */ + if (!ret) + mcpm_smp_set_ops(); +exit: + of_node_put(np); + return ret; +} +early_initcall(mb86s7x_mcpm_init); diff --git a/arch/arm/mach-mb86s7x/smc.S b/arch/arm/mach-mb86s7x/smc.S new file mode 100644 index 0000000..3ffe4f7 --- /dev/null +++ b/arch/arm/mach-mb86s7x/smc.S @@ -0,0 +1,27 @@ +/* + * SMC command interface to set secondary entry point + * Copyright: (C) 2013-2015 Fujitsu Semiconductor Limited + * Copyright: (C) 2015 Linaro Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include + +.arch_extension sec + +/* void mb86s7x_cpu_entry(unsigned long secondary_entry); */ +ENTRY(mb86s7x_cpu_entry) + stmfd sp!, {r1-r11, lr} + mov r1, r0 + ldr r0, =1 + mrc p15, 0, r3, c1, c0, 0 + mov r4, r3 + and r3, #0xbfffffff + mcr p15, 0, r3, c1, c0, 0 + smc #0 + mcr p15, 0, r4, c1, c0, 0 + ldmfd sp!, {r1-r11, pc} +ENDPROC(mb86s7x_cpu_entry) diff --git a/drivers/soc/mb86s7x/scb_mhu.c b/drivers/soc/mb86s7x/scb_mhu.c index 2fe59c2..b5dd603 100644 --- a/drivers/soc/mb86s7x/scb_mhu.c +++ b/drivers/soc/mb86s7x/scb_mhu.c @@ -89,6 +89,20 @@ static struct mhu_xfer { struct list_head node; } *ax; /* stages of xfer */ +#define WFI_COLOR_OFFSET 0x3f00 + +void mb86s7x_set_wficolor(unsigned clstr, unsigned cpu, unsigned clr) +{ + u8 val; + + val = readb_relaxed(mb86s7x_shm_base + + WFI_COLOR_OFFSET + clstr * 2 + cpu); + val &= ~AT_WFI_COLOR_MASK; + val |= clr; + writeb_relaxed(val, mb86s7x_shm_base + + WFI_COLOR_OFFSET + clstr * 2 + cpu); +} + static int mhu_alloc_xfers(int n, struct list_head *list) { struct mhu_xfer *x = kcalloc(n, sizeof(struct mhu_xfer), GFP_ATOMIC); diff --git a/include/soc/mb86s7x/scb_mhu.h b/include/soc/mb86s7x/scb_mhu.h index 334fa9f..f792950 100644 --- a/include/soc/mb86s7x/scb_mhu.h +++ b/include/soc/mb86s7x/scb_mhu.h @@ -87,6 +87,14 @@ enum { #define CMD_POWERDOMAIN_SET_REP ENC_REP(CMD_POWERDOMAIN_SET_REQ) #define CMD_STG_BLOCK_ERASE_REP ENC_REP(CMD_STG_BLOCK_ERASE_REQ) +#define AT_WFI_DO_NOTHING 0x0 +#define AT_WFI_DO_SUSPEND 0x1 +#define AT_WFI_DO_POWEROFF 0x2 +#define AT_WFI_COLOR_MASK 0x3 + +void mb86s7x_set_wficolor(unsigned clstr, unsigned cpu, unsigned clr); +void mb86s7x_cpu_entry(unsigned long secondary_entry); + /* Helper functions to talk to remote */ int mb86s7x_send_packet(int cmd, void *buf, int len);