From 9a5a110eb9ba137840cacb06cead746a6a238b09 Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Mon, 30 Jun 2014 17:15:37 -0500 Subject: [PATCH 1/5] ARM: add SMP support for Broadcom mobile SoCs This patch adds SMP support for BCM281XX and BCM21664 family SoCs. This feature is controlled with a distinct config option such that an SMP-enabled multi-v7 binary can be configured to run these SoCs in uniprocessor mode. Since this SMP functionality is used for multiple Broadcom mobile chip families the config option is called ARCH_BCM_MOBILE_SMP (for lack of a better name). On SoCs of this type, the secondary core is not held in reset on power-on. Instead it loops in a ROM-based holding pen. To release it, one must write into a special register a jump address whose low-order bits have been replaced with a secondary core's id, then trigger an event with SEV. On receipt of an event, the ROM code will examine the register's contents, and if the low-order bits match its cpu id, it will clear them and write the value back to the register just prior to jumping to the address specified. The location of the special register is defined in the device tree using a "secondary-boot-reg" property in a node whose "enable-method" matches. Derived from code originally provided by Ray Jui Signed-off-by: Alex Elder Signed-off-by: Matt Porter --- arch/arm/mach-bcm/Kconfig | 18 +++- arch/arm/mach-bcm/Makefile | 3 + arch/arm/mach-bcm/kona_smp.c | 202 +++++++++++++++++++++++++++++++++++ 3 files changed, 220 insertions(+), 3 deletions(-) create mode 100644 arch/arm/mach-bcm/kona_smp.c diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig index 41c839167e87..6bafa2dbaece 100644 --- a/arch/arm/mach-bcm/Kconfig +++ b/arch/arm/mach-bcm/Kconfig @@ -9,7 +9,6 @@ config ARCH_BCM_MOBILE bool "Broadcom Mobile SoC Support" if ARCH_MULTI_V7 select ARCH_REQUIRE_GPIOLIB select ARM_ERRATA_754322 - select ARM_ERRATA_764369 if SMP select ARM_ERRATA_775420 select ARM_GIC select GPIO_BCM_KONA @@ -26,16 +25,18 @@ menu "Broadcom Mobile SoC Selection" config ARCH_BCM_281XX bool "Broadcom BCM281XX SoC family" default y + select HAVE_SMP help - Enable support for the the BCM281XX family, which includes + Enable support for the BCM281XX family, which includes BCM11130, BCM11140, BCM11351, BCM28145 and BCM28155 variants. config ARCH_BCM_21664 bool "Broadcom BCM21664 SoC family" default y + select HAVE_SMP help - Enable support for the the BCM21664 family, which includes + Enable support for the BCM21664 family, which includes BCM21663 and BCM21664 variants. config ARCH_BCM_MOBILE_L2_CACHE @@ -49,6 +50,17 @@ config ARCH_BCM_MOBILE_SMC bool depends on ARCH_BCM_281XX || ARCH_BCM_21664 +config ARCH_BCM_MOBILE_SMP + bool "Broadcom mobile SoC SMP support" + depends on (ARCH_BCM_281XX || ARCH_BCM_21664) && SMP + default y + select HAVE_ARM_SCU + select ARM_ERRATA_764369 + help + SMP support for the BCM281XX and BCM21664 SoC families. + Provided as an option so SMP support for SoCs of this type + can be disabled for an SMP-enabled kernel. + endmenu endif diff --git a/arch/arm/mach-bcm/Makefile b/arch/arm/mach-bcm/Makefile index 731292114975..2eaafc848f4d 100644 --- a/arch/arm/mach-bcm/Makefile +++ b/arch/arm/mach-bcm/Makefile @@ -16,6 +16,9 @@ obj-$(CONFIG_ARCH_BCM_281XX) += board_bcm281xx.o # BCM21664 obj-$(CONFIG_ARCH_BCM_21664) += board_bcm21664.o +# BCM281XX and BCM21664 SMP support +obj-$(CONFIG_ARCH_BCM_MOBILE_SMP) += kona_smp.o + # BCM281XX and BCM21664 L2 cache control obj-$(CONFIG_ARCH_BCM_MOBILE_L2_CACHE) += kona_l2_cache.o diff --git a/arch/arm/mach-bcm/kona_smp.c b/arch/arm/mach-bcm/kona_smp.c new file mode 100644 index 000000000000..66a0465528a5 --- /dev/null +++ b/arch/arm/mach-bcm/kona_smp.c @@ -0,0 +1,202 @@ +/* + * Copyright (C) 2014 Broadcom Corporation + * Copyright 2014 Linaro Limited + * + * 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. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include +#include + +#include +#include +#include + +/* Size of mapped Cortex A9 SCU address space */ +#define CORTEX_A9_SCU_SIZE 0x58 + +#define SECONDARY_TIMEOUT_NS NSEC_PER_MSEC /* 1 msec (in nanoseconds) */ +#define BOOT_ADDR_CPUID_MASK 0x3 + +/* Name of device node property defining secondary boot register location */ +#define OF_SECONDARY_BOOT "secondary-boot-reg" + +/* I/O address of register used to coordinate secondary core startup */ +static u32 secondary_boot; + +/* + * Enable the Cortex A9 Snoop Control Unit + * + * By the time this is called we already know there are multiple + * cores present. We assume we're running on a Cortex A9 processor, + * so any trouble getting the base address register or getting the + * SCU base is a problem. + * + * Return 0 if successful or an error code otherwise. + */ +static int __init scu_a9_enable(void) +{ + unsigned long config_base; + void __iomem *scu_base; + + if (!scu_a9_has_base()) { + pr_err("no configuration base address register!\n"); + return -ENXIO; + } + + /* Config base address register value is zero for uniprocessor */ + config_base = scu_a9_get_base(); + if (!config_base) { + pr_err("hardware reports only one core\n"); + return -ENOENT; + } + + scu_base = ioremap((phys_addr_t)config_base, CORTEX_A9_SCU_SIZE); + if (!scu_base) { + pr_err("failed to remap config base (%lu/%u) for SCU\n", + config_base, CORTEX_A9_SCU_SIZE); + return -ENOMEM; + } + + scu_enable(scu_base); + + iounmap(scu_base); /* That's the last we'll need of this */ + + return 0; +} + +static void __init bcm_smp_prepare_cpus(unsigned int max_cpus) +{ + static cpumask_t only_cpu_0 = { CPU_BITS_CPU0 }; + struct device_node *node; + int ret; + + BUG_ON(secondary_boot); /* We're called only once */ + + /* + * This function is only called via smp_ops->smp_prepare_cpu(). + * That only happens if a "/cpus" device tree node exists + * and has an "enable-method" property that selects the SMP + * operations defined herein. + */ + node = of_find_node_by_path("/cpus"); + BUG_ON(!node); + + /* + * Our secondary enable method requires a "secondary-boot-reg" + * property to specify a register address used to request the + * ROM code boot a secondary code. If we have any trouble + * getting this we fall back to uniprocessor mode. + */ + if (of_property_read_u32(node, OF_SECONDARY_BOOT, &secondary_boot)) { + pr_err("%s: missing/invalid " OF_SECONDARY_BOOT " property\n", + node->name); + ret = -ENOENT; /* Arrange to disable SMP */ + goto out; + } + + /* + * Enable the SCU on Cortex A9 based SoCs. If -ENOENT is + * returned, the SoC reported a uniprocessor configuration. + * We bail on any other error. + */ + ret = scu_a9_enable(); +out: + of_node_put(node); + if (ret) { + /* Update the CPU present map to reflect uniprocessor mode */ + BUG_ON(ret != -ENOENT); + pr_warn("disabling SMP\n"); + init_cpu_present(&only_cpu_0); + } +} + +/* + * The ROM code has the secondary cores looping, waiting for an event. + * When an event occurs each core examines the bottom two bits of the + * secondary boot register. When a core finds those bits contain its + * own core id, it performs initialization, including computing its boot + * address by clearing the boot register value's bottom two bits. The + * core signals that it is beginning its execution by writing its boot + * address back to the secondary boot register, and finally jumps to + * that address. + * + * So to start a core executing we need to: + * - Encode the (hardware) CPU id with the bottom bits of the secondary + * start address. + * - Write that value into the secondary boot register. + * - Generate an event to wake up the secondary CPU(s). + * - Wait for the secondary boot register to be re-written, which + * indicates the secondary core has started. + */ +static int bcm_boot_secondary(unsigned int cpu, struct task_struct *idle) +{ + void __iomem *boot_reg; + phys_addr_t boot_func; + u64 start_clock; + u32 cpu_id; + u32 boot_val; + bool timeout = false; + + cpu_id = cpu_logical_map(cpu); + if (cpu_id & ~BOOT_ADDR_CPUID_MASK) { + pr_err("bad cpu id (%u > %u)\n", cpu_id, BOOT_ADDR_CPUID_MASK); + return -EINVAL; + } + + if (!secondary_boot) { + pr_err("required secondary boot register not specified\n"); + return -EINVAL; + } + + boot_reg = ioremap_nocache((phys_addr_t)secondary_boot, sizeof(u32)); + if (!boot_reg) { + pr_err("unable to map boot register for cpu %u\n", cpu_id); + return -ENOSYS; + } + + /* + * Secondary cores will start in secondary_startup(), + * defined in "arch/arm/kernel/head.S" + */ + boot_func = virt_to_phys(secondary_startup); + BUG_ON(boot_func & BOOT_ADDR_CPUID_MASK); + BUG_ON(boot_func > (phys_addr_t)U32_MAX); + + /* The core to start is encoded in the low bits */ + boot_val = (u32)boot_func | cpu_id; + writel_relaxed(boot_val, boot_reg); + + sev(); + + /* The low bits will be cleared once the core has started */ + start_clock = local_clock(); + while (!timeout && readl_relaxed(boot_reg) == boot_val) + timeout = local_clock() - start_clock > SECONDARY_TIMEOUT_NS; + + iounmap(boot_reg); + + if (!timeout) + return 0; + + pr_err("timeout waiting for cpu %u to start\n", cpu_id); + + return -ENOSYS; +} + +static struct smp_operations bcm_smp_ops __initdata = { + .smp_prepare_cpus = bcm_smp_prepare_cpus, + .smp_boot_secondary = bcm_boot_secondary, +}; +CPU_METHOD_OF_DECLARE(bcm_smp_bcm281xx, "brcm,bcm11351-cpu-method", + &bcm_smp_ops); From 67115239ca63f28bda6827a1e2d8098e329a7c23 Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Mon, 30 Jun 2014 17:15:38 -0500 Subject: [PATCH 2/5] ARM: configs: enable SMP in bcm_defconfig Also explicitly set CONFIG_NR_CPUS to 2, limiting it to the most we currently need. Signed-off-by: Ray Jui Signed-off-by: Alex Elder Signed-off-by: Matt Porter --- arch/arm/configs/bcm_defconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm/configs/bcm_defconfig b/arch/arm/configs/bcm_defconfig index 4bf72264b175..fbebcbce1e8c 100644 --- a/arch/arm/configs/bcm_defconfig +++ b/arch/arm/configs/bcm_defconfig @@ -27,6 +27,7 @@ CONFIG_PARTITION_ADVANCED=y CONFIG_ARCH_BCM=y CONFIG_ARCH_BCM_MOBILE=y CONFIG_ARM_THUMBEE=y +CONFIG_SMP=y CONFIG_PREEMPT=y CONFIG_AEABI=y # CONFIG_COMPACTION is not set From 4fbe66d9903425156c193ae44c81c0f7557755c4 Mon Sep 17 00:00:00 2001 From: Marc Carino Date: Thu, 16 Jan 2014 15:00:42 -0800 Subject: [PATCH 3/5] ARM: brcmstb: add infrastructure for ARM-based Broadcom STB SoCs The BCM7xxx series of Broadcom SoCs are used primarily in set-top boxes. This patch adds machine support for the ARM-based Broadcom SoCs. Signed-off-by: Marc Carino Acked-by: Arnd Bergmann Signed-off-by: Brian Norris Signed-off-by: Matt Porter --- arch/arm/configs/multi_v7_defconfig | 1 + arch/arm/mach-bcm/Kconfig | 14 ++ arch/arm/mach-bcm/Makefile | 5 + arch/arm/mach-bcm/brcmstb.c | 28 +++ arch/arm/mach-bcm/brcmstb.h | 19 ++ arch/arm/mach-bcm/headsmp-brcmstb.S | 33 +++ arch/arm/mach-bcm/platsmp-brcmstb.c | 363 ++++++++++++++++++++++++++++ 7 files changed, 463 insertions(+) create mode 100644 arch/arm/mach-bcm/brcmstb.c create mode 100644 arch/arm/mach-bcm/brcmstb.h create mode 100644 arch/arm/mach-bcm/headsmp-brcmstb.S create mode 100644 arch/arm/mach-bcm/platsmp-brcmstb.c diff --git a/arch/arm/configs/multi_v7_defconfig b/arch/arm/configs/multi_v7_defconfig index 534836497998..bf0df396a3cf 100644 --- a/arch/arm/configs/multi_v7_defconfig +++ b/arch/arm/configs/multi_v7_defconfig @@ -19,6 +19,7 @@ CONFIG_MACH_DOVE=y CONFIG_ARCH_BCM=y CONFIG_ARCH_BCM_MOBILE=y CONFIG_ARCH_BCM_5301X=y +CONFIG_ARCH_BRCMSTB=y CONFIG_ARCH_BERLIN=y CONFIG_MACH_BERLIN_BG2=y CONFIG_MACH_BERLIN_BG2CD=y diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig index 6bafa2dbaece..7889866c668d 100644 --- a/arch/arm/mach-bcm/Kconfig +++ b/arch/arm/mach-bcm/Kconfig @@ -99,4 +99,18 @@ config ARCH_BCM_5301X different SoC or with the older BCM47XX and BCM53XX based network SoC using a MIPS CPU, they are supported by arch/mips/bcm47xx +config ARCH_BRCMSTB + bool "Broadcom BCM7XXX based boards" if ARCH_MULTI_V7 + depends on MMU + select ARM_GIC + select MIGHT_HAVE_PCI + select HAVE_SMP + select HAVE_ARM_ARCH_TIMER + help + Say Y if you intend to run the kernel on a Broadcom ARM-based STB + chipset. + + This enables support for Broadcom ARM-based set-top box chipsets, + including the 7445 family of chips. + endif diff --git a/arch/arm/mach-bcm/Makefile b/arch/arm/mach-bcm/Makefile index 2eaafc848f4d..67c492aabf4d 100644 --- a/arch/arm/mach-bcm/Makefile +++ b/arch/arm/mach-bcm/Makefile @@ -33,3 +33,8 @@ obj-$(CONFIG_ARCH_BCM2835) += board_bcm2835.o # BCM5301X obj-$(CONFIG_ARCH_BCM_5301X) += bcm_5301x.o + +ifeq ($(CONFIG_ARCH_BRCMSTB),y) +obj-y += brcmstb.o +obj-$(CONFIG_SMP) += headsmp-brcmstb.o platsmp-brcmstb.o +endif diff --git a/arch/arm/mach-bcm/brcmstb.c b/arch/arm/mach-bcm/brcmstb.c new file mode 100644 index 000000000000..60a5afa06ed7 --- /dev/null +++ b/arch/arm/mach-bcm/brcmstb.c @@ -0,0 +1,28 @@ +/* + * Copyright (C) 2013-2014 Broadcom 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. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include + +#include +#include + +static const char *brcmstb_match[] __initconst = { + "brcm,bcm7445", + "brcm,brcmstb", + NULL +}; + +DT_MACHINE_START(BRCMSTB, "Broadcom STB (Flattened Device Tree)") + .dt_compat = brcmstb_match, +MACHINE_END diff --git a/arch/arm/mach-bcm/brcmstb.h b/arch/arm/mach-bcm/brcmstb.h new file mode 100644 index 000000000000..ec0c3d112b36 --- /dev/null +++ b/arch/arm/mach-bcm/brcmstb.h @@ -0,0 +1,19 @@ +/* + * Copyright (C) 2013-2014 Broadcom 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. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef __BRCMSTB_H__ +#define __BRCMSTB_H__ + +void brcmstb_secondary_startup(void); + +#endif /* __BRCMSTB_H__ */ diff --git a/arch/arm/mach-bcm/headsmp-brcmstb.S b/arch/arm/mach-bcm/headsmp-brcmstb.S new file mode 100644 index 000000000000..199c1ea58248 --- /dev/null +++ b/arch/arm/mach-bcm/headsmp-brcmstb.S @@ -0,0 +1,33 @@ +/* + * SMP boot code for secondary CPUs + * Based on arch/arm/mach-tegra/headsmp.S + * + * Copyright (C) 2010 NVIDIA, Inc. + * Copyright (C) 2013-2014 Broadcom 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. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include + + .section ".text.head", "ax" + +ENTRY(brcmstb_secondary_startup) + /* + * Ensure CPU is in a sane state by disabling all IRQs and switching + * into SVC mode. + */ + setmode PSR_I_BIT | PSR_F_BIT | SVC_MODE, r0 + + bl v7_invalidate_l1 + b secondary_startup +ENDPROC(brcmstb_secondary_startup) diff --git a/arch/arm/mach-bcm/platsmp-brcmstb.c b/arch/arm/mach-bcm/platsmp-brcmstb.c new file mode 100644 index 000000000000..af780e9c23a6 --- /dev/null +++ b/arch/arm/mach-bcm/platsmp-brcmstb.c @@ -0,0 +1,363 @@ +/* + * Broadcom STB CPU SMP and hotplug support for ARM + * + * Copyright (C) 2013-2014 Broadcom 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. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#include "brcmstb.h" + +enum { + ZONE_MAN_CLKEN_MASK = BIT(0), + ZONE_MAN_RESET_CNTL_MASK = BIT(1), + ZONE_MAN_MEM_PWR_MASK = BIT(4), + ZONE_RESERVED_1_MASK = BIT(5), + ZONE_MAN_ISO_CNTL_MASK = BIT(6), + ZONE_MANUAL_CONTROL_MASK = BIT(7), + ZONE_PWR_DN_REQ_MASK = BIT(9), + ZONE_PWR_UP_REQ_MASK = BIT(10), + ZONE_BLK_RST_ASSERT_MASK = BIT(12), + ZONE_PWR_OFF_STATE_MASK = BIT(25), + ZONE_PWR_ON_STATE_MASK = BIT(26), + ZONE_DPG_PWR_STATE_MASK = BIT(28), + ZONE_MEM_PWR_STATE_MASK = BIT(29), + ZONE_RESET_STATE_MASK = BIT(31), + CPU0_PWR_ZONE_CTRL_REG = 1, + CPU_RESET_CONFIG_REG = 2, +}; + +static void __iomem *cpubiuctrl_block; +static void __iomem *hif_cont_block; +static u32 cpu0_pwr_zone_ctrl_reg; +static u32 cpu_rst_cfg_reg; +static u32 hif_cont_reg; + +#ifdef CONFIG_HOTPLUG_CPU +static DEFINE_PER_CPU_ALIGNED(int, per_cpu_sw_state); + +static int per_cpu_sw_state_rd(u32 cpu) +{ + sync_cache_r(SHIFT_PERCPU_PTR(&per_cpu_sw_state, per_cpu_offset(cpu))); + return per_cpu(per_cpu_sw_state, cpu); +} + +static void per_cpu_sw_state_wr(u32 cpu, int val) +{ + per_cpu(per_cpu_sw_state, cpu) = val; + dmb(); + sync_cache_w(SHIFT_PERCPU_PTR(&per_cpu_sw_state, per_cpu_offset(cpu))); + dsb_sev(); +} +#else +static inline void per_cpu_sw_state_wr(u32 cpu, int val) { } +#endif + +static void __iomem *pwr_ctrl_get_base(u32 cpu) +{ + void __iomem *base = cpubiuctrl_block + cpu0_pwr_zone_ctrl_reg; + base += (cpu_logical_map(cpu) * 4); + return base; +} + +static u32 pwr_ctrl_rd(u32 cpu) +{ + void __iomem *base = pwr_ctrl_get_base(cpu); + return readl_relaxed(base); +} + +static void pwr_ctrl_wr(u32 cpu, u32 val) +{ + void __iomem *base = pwr_ctrl_get_base(cpu); + writel(val, base); +} + +static void cpu_rst_cfg_set(u32 cpu, int set) +{ + u32 val; + val = readl_relaxed(cpubiuctrl_block + cpu_rst_cfg_reg); + if (set) + val |= BIT(cpu_logical_map(cpu)); + else + val &= ~BIT(cpu_logical_map(cpu)); + writel_relaxed(val, cpubiuctrl_block + cpu_rst_cfg_reg); +} + +static void cpu_set_boot_addr(u32 cpu, unsigned long boot_addr) +{ + const int reg_ofs = cpu_logical_map(cpu) * 8; + writel_relaxed(0, hif_cont_block + hif_cont_reg + reg_ofs); + writel_relaxed(boot_addr, hif_cont_block + hif_cont_reg + 4 + reg_ofs); +} + +static void brcmstb_cpu_boot(u32 cpu) +{ + pr_info("SMP: Booting CPU%d...\n", cpu); + + /* + * set the reset vector to point to the secondary_startup + * routine + */ + cpu_set_boot_addr(cpu, virt_to_phys(brcmstb_secondary_startup)); + + /* unhalt the cpu */ + cpu_rst_cfg_set(cpu, 0); +} + +static void brcmstb_cpu_power_on(u32 cpu) +{ + /* + * The secondary cores power was cut, so we must go through + * power-on initialization. + */ + u32 tmp; + + pr_info("SMP: Powering up CPU%d...\n", cpu); + + /* Request zone power up */ + pwr_ctrl_wr(cpu, ZONE_PWR_UP_REQ_MASK); + + /* Wait for the power up FSM to complete */ + do { + tmp = pwr_ctrl_rd(cpu); + } while (!(tmp & ZONE_PWR_ON_STATE_MASK)); + + per_cpu_sw_state_wr(cpu, 1); +} + +static int brcmstb_cpu_get_power_state(u32 cpu) +{ + int tmp = pwr_ctrl_rd(cpu); + return (tmp & ZONE_RESET_STATE_MASK) ? 0 : 1; +} + +#ifdef CONFIG_HOTPLUG_CPU + +static void brcmstb_cpu_die(u32 cpu) +{ + v7_exit_coherency_flush(all); + + /* Prevent all interrupts from reaching this CPU. */ + arch_local_irq_disable(); + + /* + * Final full barrier to ensure everything before this instruction has + * quiesced. + */ + isb(); + dsb(); + + per_cpu_sw_state_wr(cpu, 0); + + /* Sit and wait to die */ + wfi(); + + /* We should never get here... */ + panic("Spurious interrupt on CPU %d received!\n", cpu); +} + +static int brcmstb_cpu_kill(u32 cpu) +{ + u32 tmp; + + pr_info("SMP: Powering down CPU%d...\n", cpu); + + while (per_cpu_sw_state_rd(cpu)) + ; + + /* Program zone reset */ + pwr_ctrl_wr(cpu, ZONE_RESET_STATE_MASK | ZONE_BLK_RST_ASSERT_MASK | + ZONE_PWR_DN_REQ_MASK); + + /* Verify zone reset */ + tmp = pwr_ctrl_rd(cpu); + if (!(tmp & ZONE_RESET_STATE_MASK)) + pr_err("%s: Zone reset bit for CPU %d not asserted!\n", + __func__, cpu); + + /* Wait for power down */ + do { + tmp = pwr_ctrl_rd(cpu); + } while (!(tmp & ZONE_PWR_OFF_STATE_MASK)); + + /* Settle-time from Broadcom-internal DVT reference code */ + udelay(7); + + /* Assert reset on the CPU */ + cpu_rst_cfg_set(cpu, 1); + + return 1; +} + +#endif /* CONFIG_HOTPLUG_CPU */ + +static int __init setup_hifcpubiuctrl_regs(struct device_node *np) +{ + int rc = 0; + char *name; + struct device_node *syscon_np = NULL; + + name = "syscon-cpu"; + + syscon_np = of_parse_phandle(np, name, 0); + if (!syscon_np) { + pr_err("can't find phandle %s\n", name); + rc = -EINVAL; + goto cleanup; + } + + cpubiuctrl_block = of_iomap(syscon_np, 0); + if (!cpubiuctrl_block) { + pr_err("iomap failed for cpubiuctrl_block\n"); + rc = -EINVAL; + goto cleanup; + } + + rc = of_property_read_u32_index(np, name, CPU0_PWR_ZONE_CTRL_REG, + &cpu0_pwr_zone_ctrl_reg); + if (rc) { + pr_err("failed to read 1st entry from %s property (%d)\n", name, + rc); + rc = -EINVAL; + goto cleanup; + } + + rc = of_property_read_u32_index(np, name, CPU_RESET_CONFIG_REG, + &cpu_rst_cfg_reg); + if (rc) { + pr_err("failed to read 2nd entry from %s property (%d)\n", name, + rc); + rc = -EINVAL; + goto cleanup; + } + +cleanup: + if (syscon_np) + of_node_put(syscon_np); + + return rc; +} + +static int __init setup_hifcont_regs(struct device_node *np) +{ + int rc = 0; + char *name; + struct device_node *syscon_np = NULL; + + name = "syscon-cont"; + + syscon_np = of_parse_phandle(np, name, 0); + if (!syscon_np) { + pr_err("can't find phandle %s\n", name); + rc = -EINVAL; + goto cleanup; + } + + hif_cont_block = of_iomap(syscon_np, 0); + if (!hif_cont_block) { + pr_err("iomap failed for hif_cont_block\n"); + rc = -EINVAL; + goto cleanup; + } + + /* offset is at top of hif_cont_block */ + hif_cont_reg = 0; + +cleanup: + if (syscon_np) + of_node_put(syscon_np); + + return rc; +} + +static void __init brcmstb_cpu_ctrl_setup(unsigned int max_cpus) +{ + int rc; + struct device_node *np; + char *name; + + name = "brcm,brcmstb-smpboot"; + np = of_find_compatible_node(NULL, NULL, name); + if (!np) { + pr_err("can't find compatible node %s\n", name); + return; + } + + rc = setup_hifcpubiuctrl_regs(np); + if (rc) + return; + + rc = setup_hifcont_regs(np); + if (rc) + return; +} + +static DEFINE_SPINLOCK(boot_lock); + +static void brcmstb_secondary_init(unsigned int cpu) +{ + /* + * Synchronise with the boot thread. + */ + spin_lock(&boot_lock); + spin_unlock(&boot_lock); +} + +static int brcmstb_boot_secondary(unsigned int cpu, struct task_struct *idle) +{ + /* + * set synchronisation state between this boot processor + * and the secondary one + */ + spin_lock(&boot_lock); + + /* Bring up power to the core if necessary */ + if (brcmstb_cpu_get_power_state(cpu) == 0) + brcmstb_cpu_power_on(cpu); + + brcmstb_cpu_boot(cpu); + + /* + * now the secondary core is starting up let it run its + * calibrations, then wait for it to finish + */ + spin_unlock(&boot_lock); + + return 0; +} + +static struct smp_operations brcmstb_smp_ops __initdata = { + .smp_prepare_cpus = brcmstb_cpu_ctrl_setup, + .smp_secondary_init = brcmstb_secondary_init, + .smp_boot_secondary = brcmstb_boot_secondary, +#ifdef CONFIG_HOTPLUG_CPU + .cpu_kill = brcmstb_cpu_kill, + .cpu_die = brcmstb_cpu_die, +#endif +}; + +CPU_METHOD_OF_DECLARE(brcmstb_smp, "brcm,brahma-b15", &brcmstb_smp_ops); From 305787f9016a67fa4644272c0253bbd25ed4a44a Mon Sep 17 00:00:00 2001 From: Brian Norris Date: Tue, 22 Jul 2014 15:58:17 -0700 Subject: [PATCH 4/5] ARM: brcmstb: select GISB arbiter and interrupt drivers Signed-off-by: Brian Norris Acked-by: Florian Fainelli Acked-by: Arnd Bergmann Signed-off-by: Matt Porter --- arch/arm/mach-bcm/Kconfig | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig index 7889866c668d..fc938005ad39 100644 --- a/arch/arm/mach-bcm/Kconfig +++ b/arch/arm/mach-bcm/Kconfig @@ -106,6 +106,8 @@ config ARCH_BRCMSTB select MIGHT_HAVE_PCI select HAVE_SMP select HAVE_ARM_ARCH_TIMER + select BRCMSTB_GISB_ARB + select BRCMSTB_L2_IRQ help Say Y if you intend to run the kernel on a Broadcom ARM-based STB chipset. From 2df94fd66a1135f887bfabef413b568969f5d77b Mon Sep 17 00:00:00 2001 From: Brian Norris Date: Mon, 14 Jul 2014 18:06:03 -0700 Subject: [PATCH 5/5] MAINTAINERS: add entry for Broadcom ARM STB architecture Signed-off-by: Brian Norris Acked-by: Arnd Bergmann Signed-off-by: Matt Porter --- MAINTAINERS | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 61a8f486306b..8e727c467706 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1969,6 +1969,14 @@ F: arch/arm/mach-bcm/bcm_5301x.c F: arch/arm/boot/dts/bcm5301x.dtsi F: arch/arm/boot/dts/bcm470* +BROADCOM BCM7XXX ARM ARCHITECTURE +M: Marc Carino +M: Brian Norris +L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers) +S: Maintained +F: arch/arm/mach-bcm/*brcmstb* +F: arch/arm/boot/dts/bcm7*.dts* + BROADCOM TG3 GIGABIT ETHERNET DRIVER M: Nithin Nayak Sujir M: Michael Chan