diff options
Diffstat (limited to 'target/linux/bcm53xx/patches-4.1/131-ARM-BCM5301X-Implement-SMP-support.patch')
| -rw-r--r-- | target/linux/bcm53xx/patches-4.1/131-ARM-BCM5301X-Implement-SMP-support.patch | 314 |
1 files changed, 314 insertions, 0 deletions
diff --git a/target/linux/bcm53xx/patches-4.1/131-ARM-BCM5301X-Implement-SMP-support.patch b/target/linux/bcm53xx/patches-4.1/131-ARM-BCM5301X-Implement-SMP-support.patch new file mode 100644 index 0000000..bdc7dea --- /dev/null +++ b/target/linux/bcm53xx/patches-4.1/131-ARM-BCM5301X-Implement-SMP-support.patch @@ -0,0 +1,314 @@ +From 707ab07695ea8953a5bb56512e7bb38ca79c5c38 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com> +Date: Thu, 19 Feb 2015 23:27:59 +0100 +Subject: [PATCH V2] ARM: BCM5301X: Implement SMP support +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +Signed-off-by: Rafał Miłecki <zajec5@gmail.com> +--- +V2: Change code after receiving Florian's comments: + 1) Use "mmio-sram" + 2) Remove commented out ASM call + 3) Fix coding style in ASM + 4) Simplify finding OF node +--- + Documentation/devicetree/bindings/arm/bcm4708.txt | 24 ++++ + Documentation/devicetree/bindings/arm/cpus.txt | 1 + + arch/arm/boot/dts/bcm4708.dtsi | 13 ++ + arch/arm/mach-bcm/Makefile | 3 + + arch/arm/mach-bcm/bcm5301x_headsmp.S | 45 ++++++ + arch/arm/mach-bcm/bcm5301x_smp.c | 158 ++++++++++++++++++++++ + 6 files changed, 244 insertions(+) + create mode 100644 arch/arm/mach-bcm/bcm5301x_headsmp.S + create mode 100644 arch/arm/mach-bcm/bcm5301x_smp.c + +--- a/Documentation/devicetree/bindings/arm/bcm/brcm,bcm4708.txt ++++ b/Documentation/devicetree/bindings/arm/bcm/brcm,bcm4708.txt +@@ -6,3 +6,27 @@ Boards with the BCM4708 SoC shall have t + Required root node property: + + compatible = "brcm,bcm4708"; ++ ++Optional sub-node properties: ++ ++compatible = "mmio-sram" for SRAM access with IO memory region ++ This is needed for SMP-capable SoCs which use part of ++ SRAM for storing location of code to be executed by the ++ extra cores. ++ SMP support requires another sub-node with compatible ++ property "brcm,bcm4708-sysram". ++ ++Example: ++ ++ sysram@ffff0000 { ++ compatible = "mmio-sram"; ++ reg = <0xffff0000 0x10000>; ++ #address-cells = <1>; ++ #size-cells = <1>; ++ ranges = <0 0xffff0000 0x10000>; ++ ++ smp-sysram@0 { ++ compatible = "brcm,bcm4708-sysram"; ++ reg = <0x0 0x1000>; ++ }; ++ }; +--- a/Documentation/devicetree/bindings/arm/cpus.txt ++++ b/Documentation/devicetree/bindings/arm/cpus.txt +@@ -189,6 +189,7 @@ nodes to be present and contain the prop + can be one of: + "allwinner,sun6i-a31" + "arm,psci" ++ "brcm,bcm4708-smp" + "brcm,brahma-b15" + "marvell,armada-375-smp" + "marvell,armada-380-smp" +--- a/arch/arm/boot/dts/bcm4708.dtsi ++++ b/arch/arm/boot/dts/bcm4708.dtsi +@@ -15,6 +15,7 @@ + cpus { + #address-cells = <1>; + #size-cells = <0>; ++ enable-method = "brcm,bcm4708-smp"; + + cpu@0 { + device_type = "cpu"; +@@ -31,4 +32,16 @@ + }; + }; + ++ sysram@ffff0000 { ++ compatible = "mmio-sram"; ++ reg = <0xffff0000 0x10000>; ++ #address-cells = <1>; ++ #size-cells = <1>; ++ ranges = <0 0xffff0000 0x10000>; ++ ++ smp-sysram@0 { ++ compatible = "brcm,bcm4708-sysram"; ++ reg = <0x0 0x1000>; ++ }; ++ }; + }; +--- a/arch/arm/mach-bcm/Makefile ++++ b/arch/arm/mach-bcm/Makefile +@@ -36,6 +36,9 @@ obj-$(CONFIG_ARCH_BCM2835) += board_bcm2 + + # BCM5301X + obj-$(CONFIG_ARCH_BCM_5301X) += bcm_5301x.o ++ifeq ($(CONFIG_SMP),y) ++obj-$(CONFIG_ARCH_BCM_5301X) += bcm5301x_smp.o bcm5301x_headsmp.o ++endif + + # BCM63XXx + obj-$(CONFIG_ARCH_BCM_63XX) := bcm63xx.o +--- /dev/null ++++ b/arch/arm/mach-bcm/bcm5301x_headsmp.S +@@ -0,0 +1,45 @@ ++/* ++ * Broadcom BCM470X / BCM5301X ARM platform code. ++ * ++ * Copyright (c) 2003 ARM Limited ++ * All Rights Reserved ++ * ++ * Licensed under the GNU/GPL. See COPYING for details. ++ */ ++#include <linux/linkage.h> ++ ++/* ++ * BCM5301X specific entry point for secondary CPUs. ++ */ ++ENTRY(bcm5301x_secondary_startup) ++ mrc p15, 0, r0, c0, c0, 5 ++ and r0, r0, #15 ++ adr r4, 1f ++ ldmia r4, {r5, r6} ++ sub r4, r4, r5 ++ add r6, r6, r4 ++pen: ldr r7, [r6] ++ cmp r7, r0 ++ bne pen ++ ++ /* ++ * In case L1 cache has unpredictable contents at power-up ++ * clean its contents without flushing. ++ */ ++ bl v7_invalidate_l1 ++ ++ mov r0, #0 ++ mcr p15, 0, r0, c7, c5, 0 /* Invalidate icache */ ++ dsb ++ isb ++ ++ /* ++ * we've been released from the holding pen: secondary_stack ++ * should now contain the SVC stack for this core ++ */ ++ b secondary_startup ++ENDPROC(bcm5301x_secondary_startup) ++ ++ .align 2 ++1: .long . ++ .long pen_release +--- /dev/null ++++ b/arch/arm/mach-bcm/bcm5301x_smp.c +@@ -0,0 +1,158 @@ ++/* ++ * Broadcom BCM470X / BCM5301X ARM platform code. ++ * ++ * Copyright (C) 2002 ARM Ltd. ++ * Copyright (C) 2015 Rafał Miłecki <zajec5@gmail.com> ++ * ++ * Licensed under the GNU/GPL. See COPYING for details. ++ */ ++ ++#include <asm/cacheflush.h> ++#include <asm/delay.h> ++#include <asm/smp_plat.h> ++#include <asm/smp_scu.h> ++ ++#include <linux/clockchips.h> ++#include <linux/of.h> ++#include <linux/of_address.h> ++ ++#define SOC_ROM_LUT_OFF 0x400 ++ ++extern void bcm5301x_secondary_startup(void); ++ ++static void __cpuinit write_pen_release(int val) ++{ ++ pen_release = val; ++ smp_wmb(); ++ sync_cache_w(&pen_release); ++} ++ ++static DEFINE_SPINLOCK(boot_lock); ++ ++static void __init bcm5301x_smp_secondary_set_entry(void (*entry_point)(void)) ++{ ++ void __iomem *sysram_base_addr = NULL; ++ struct device_node *node; ++ ++ node = of_find_compatible_node(NULL, NULL, "brcm,bcm4708-sysram"); ++ if (!of_device_is_available(node)) ++ return; ++ ++ sysram_base_addr = of_iomap(node, 0); ++ if (!sysram_base_addr) { ++ pr_warn("Failed to map sysram\n"); ++ return; ++ } ++ ++ writel(virt_to_phys(entry_point), sysram_base_addr + SOC_ROM_LUT_OFF); ++ ++ dsb_sev(); /* Exit WFI */ ++ mb(); /* make sure write buffer is drained */ ++ ++ iounmap(sysram_base_addr); ++} ++ ++static void __init bcm5301x_smp_prepare_cpus(unsigned int max_cpus) ++{ ++ void __iomem *scu_base; ++ ++ if (!scu_a9_has_base()) { ++ pr_warn("Unknown SCU base\n"); ++ return; ++ } ++ ++ scu_base = ioremap((phys_addr_t)scu_a9_get_base(), SZ_256); ++ if (!scu_base) { ++ pr_err("Failed to remap SCU\n"); ++ return; ++ } ++ ++ /* Initialise the SCU */ ++ scu_enable(scu_base); ++ ++ /* Let CPUs know where to start */ ++ bcm5301x_smp_secondary_set_entry(bcm5301x_secondary_startup); ++ ++ iounmap(scu_base); ++} ++ ++static void __cpuinit bcm5301x_smp_secondary_init(unsigned int cpu) ++{ ++ trace_hardirqs_off(); ++ ++ /* ++ * let the primary processor know we're out of the ++ * pen, then head off into the C entry point ++ */ ++ write_pen_release(-1); ++ ++ /* ++ * Synchronise with the boot thread. ++ */ ++ spin_lock(&boot_lock); ++ spin_unlock(&boot_lock); ++} ++ ++static int __cpuinit bcm5301x_smp_boot_secondary(unsigned int cpu, ++ struct task_struct *idle) ++{ ++ unsigned long timeout; ++ ++ /* ++ * set synchronisation state between this boot processor ++ * and the secondary one ++ */ ++ spin_lock(&boot_lock); ++ ++ /* ++ * The secondary processor is waiting to be released from ++ * the holding pen - release it, then wait for it to flag ++ * that it has been released by resetting pen_release. ++ * ++ * Note that "pen_release" is the hardware CPU ID, whereas ++ * "cpu" is Linux's internal ID. ++ */ ++ write_pen_release(cpu_logical_map(cpu)); ++ ++ /* Send the secondary CPU SEV */ ++ dsb_sev(); ++ ++ udelay(100); ++ ++ /* ++ * Send the secondary CPU a soft interrupt, thereby causing ++ * the boot monitor to read the system wide flags register, ++ * and branch to the address found there. ++ */ ++ arch_send_wakeup_ipi_mask(cpumask_of(cpu)); ++ ++ /* ++ * Timeout set on purpose in jiffies so that on slow processors ++ * that must also have low HZ it will wait longer. ++ */ ++ timeout = jiffies + (HZ * 10); ++ while (time_before(jiffies, timeout)) { ++ smp_rmb(); ++ if (pen_release == -1) ++ break; ++ ++ udelay(10); ++ } ++ ++ /* ++ * now the secondary core is starting up let it run its ++ * calibrations, then wait for it to finish ++ */ ++ spin_unlock(&boot_lock); ++ ++ return pen_release != -1 ? -ENOSYS : 0; ++} ++ ++static struct smp_operations bcm5301x_smp_ops __initdata = { ++ .smp_prepare_cpus = bcm5301x_smp_prepare_cpus, ++ .smp_secondary_init = bcm5301x_smp_secondary_init, ++ .smp_boot_secondary = bcm5301x_smp_boot_secondary, ++}; ++ ++CPU_METHOD_OF_DECLARE(bcm5301x_smp, "brcm,bcm4708-smp", ++ &bcm5301x_smp_ops); |