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Merge tag 'arm-soc/for-4.5/soc' of http://github.com/Broadcom/stblinux into next/soc 

Merge "Broadcom soc changes for v4.5" from Florian Fainelli:

This pull request contains Broadcom SoC changes for 4.5, with the following changes:

- Lucas Stach removes the workaround for an imprecise fault for Broadcom
  BCM5301x SoCs (Northstar) since this is now handled by the ARM/Linux kernel
  directly

- Hauke Merthens enables a bunch of erratas for the Cortex-A9 and PL310 L2
  cache present on early Northstar chips (BCM4708)

- Kapil Hali adds SMP support for the Northstar Plus SoCs by consolidating the
  existing SMP code for Kona SoCs (mobile platforms), fixng the Device Tree
  binding for the Kona platforms (wrong placement for 'enable-method' and
  'secondary-reg') and then finally adds the functional code for the Northstar
  Plus platforms to boot their secondary CPUs

- Jon Mason enables SMP on BCM4708/BCM5301X (Northstar SoCs) by building the generic
  Northstar/Northstar Plus SMP code, and adding the relevant SMP Device Tree nodes

* tag 'arm-soc/for-4.5/soc' of http://github.com/Broadcom/stblinux:
  ARM: BCM: Add SMP support for Broadcom 4708
  ARM: BCM: Add SMP support for Broadcom NSP
  ARM: BCM: Clean up SMP support for Broadcom Kona
  ARM: BCM5310X: activate erratas needed for SoC
  ARM: BCM5301X: remove workaround imprecise abort fault handler
This commit is contained in:
Arnd Bergmann 2015-12-15 18:12:29 +01:00
parent 31ade3b83e 99498905ac
commit 75f287180a
7 changed files with 136 additions and 67 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/boot/dts/bcm11351.dtsi
View File

@ -31,7 +31,6 @@
#address-cells = <1>;
#size-cells = <0>;
enable-method = "brcm,bcm11351-cpu-method";
secondary-boot-reg = <0x3500417c>;
cpu0: cpu@0 {
device_type = "cpu";
@ -42,6 +41,7 @@
cpu1: cpu@1 {
device_type = "cpu";
compatible = "arm,cortex-a9";
secondary-boot-reg = <0x3500417c>;
reg = <1>;
};
};

2
arch/arm/boot/dts/bcm21664.dtsi
View File

@ -31,7 +31,6 @@
#address-cells = <1>;
#size-cells = <0>;
enable-method = "brcm,bcm11351-cpu-method";
secondary-boot-reg = <0x35004178>;
cpu0: cpu@0 {
device_type = "cpu";
@ -42,6 +41,7 @@
cpu1: cpu@1 {
device_type = "cpu";
compatible = "arm,cortex-a9";
secondary-boot-reg = <0x35004178>;
reg = <1>;
};
};

2
arch/arm/boot/dts/bcm4708.dtsi
View File

@ -15,6 +15,7 @@
cpus {
#address-cells = <1>;
#size-cells = <0>;
enable-method = "brcm,bcm-nsp-smp";
cpu@0 {
device_type = "cpu";
@ -27,6 +28,7 @@
device_type = "cpu";
compatible = "arm,cortex-a9";
next-level-cache = <&L2>;
secondary-boot-reg = <0xffff0400>;
reg = <0x1>;
};
};

7
arch/arm/mach-bcm/Kconfig
View File

@ -40,6 +40,8 @@ config ARCH_BCM_NSP
select ARCH_BCM_IPROC
select ARM_ERRATA_754322
select ARM_ERRATA_775420
select ARM_ERRATA_764369 if SMP
select HAVE_SMP
help
Support for Broadcom Northstar Plus SoC.
Broadcom Northstar Plus family of SoCs are used for switching control
@ -52,6 +54,11 @@ config ARCH_BCM_NSP
config ARCH_BCM_5301X
bool "Broadcom BCM470X / BCM5301X ARM SoC" if ARCH_MULTI_V7
select ARCH_BCM_IPROC
select ARM_ERRATA_754322
select ARM_ERRATA_775420
select ARM_ERRATA_764369 if SMP
select HAVE_SMP
help
Support for Broadcom BCM470X and BCM5301X SoCs with ARM CPU cores.

9
arch/arm/mach-bcm/Makefile
View File

@ -16,6 +16,10 @@ obj-$(CONFIG_ARCH_BCM_CYGNUS) += bcm_cygnus.o
# Northstar Plus
obj-$(CONFIG_ARCH_BCM_NSP) += bcm_nsp.o
ifeq ($(CONFIG_ARCH_BCM_NSP),y)
obj-$(CONFIG_SMP) += platsmp.o
endif
# BCM281XX
obj-$(CONFIG_ARCH_BCM_281XX) += board_bcm281xx.o
@ -23,7 +27,7 @@ obj-$(CONFIG_ARCH_BCM_281XX) += board_bcm281xx.o
obj-$(CONFIG_ARCH_BCM_21664) += board_bcm21664.o
# BCM281XX and BCM21664 SMP support
obj-$(CONFIG_ARCH_BCM_MOBILE_SMP) += kona_smp.o
obj-$(CONFIG_ARCH_BCM_MOBILE_SMP) += platsmp.o
# BCM281XX and BCM21664 L2 cache control
obj-$(CONFIG_ARCH_BCM_MOBILE_L2_CACHE) += kona_l2_cache.o
@ -39,6 +43,9 @@ obj-$(CONFIG_ARCH_BCM2835) += board_bcm2835.o
# BCM5301X
obj-$(CONFIG_ARCH_BCM_5301X) += bcm_5301x.o
ifeq ($(CONFIG_ARCH_BCM_5301X),y)
obj-$(CONFIG_SMP) += platsmp.o
endif
# BCM63XXx
ifeq ($(CONFIG_ARCH_BCM_63XX),y)

35
arch/arm/mach-bcm/bcm_5301x.c
View File

@ -9,40 +9,6 @@
#include <asm/hardware/cache-l2x0.h>
#include <asm/mach/arch.h>
#include <asm/siginfo.h>
#include <asm/signal.h>
static bool first_fault = true;
static int bcm5301x_abort_handler(unsigned long addr, unsigned int fsr,
struct pt_regs *regs)
{
if ((fsr == 0x1406 || fsr == 0x1c06) && first_fault) {
first_fault = false;
/*
* These faults with codes 0x1406 (BCM4709) or 0x1c06 happens
* for no good reason, possibly left over from the CFE boot
* loader.
*/
pr_warn("External imprecise Data abort at addr=%#lx, fsr=%#x ignored.\n",
addr, fsr);
/* Returning non-zero causes fault display and panic */
return 0;
}
/* Others should cause a fault */
return 1;
}
static void __init bcm5301x_init_early(void)
{
/* Install our hook */
hook_fault_code(16 + 6, bcm5301x_abort_handler, SIGBUS, BUS_OBJERR,
"imprecise external abort");
}
static const char *const bcm5301x_dt_compat[] __initconst = {
"brcm,bcm4708",
@ -52,6 +18,5 @@ static const char *const bcm5301x_dt_compat[] __initconst = {
DT_MACHINE_START(BCM5301X, "BCM5301X")
.l2c_aux_val = 0,
.l2c_aux_mask = ~0,
.init_early = bcm5301x_init_early,
.dt_compat = bcm5301x_dt_compat,
MACHINE_END

136
arch/arm/mach-bcm/kona_smp.c → arch/arm/mach-bcm/platsmp.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (C) 2014 Broadcom Corporation
* Copyright (C) 2014-2015 Broadcom Corporation
* Copyright 2014 Linaro Limited
*
* This program is free software; you can redistribute it and/or
@ -12,12 +12,17 @@
* GNU General Public License for more details.
*/
#include <linux/init.h>
#include <linux/cpumask.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/jiffies.h>
#include <linux/of.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <asm/cacheflush.h>
#include <asm/smp.h>
#include <asm/smp_plat.h>
#include <asm/smp_scu.h>
@ -30,9 +35,10 @@
/* Name of device node property defining secondary boot register location */
#define OF_SECONDARY_BOOT "secondary-boot-reg"
#define MPIDR_CPUID_BITMASK 0x3
/* I/O address of register used to coordinate secondary core startup */
static u32 secondary_boot;
static u32 secondary_boot_addr;
/*
* Enable the Cortex A9 Snoop Control Unit
@ -75,35 +81,88 @@ static int __init scu_a9_enable(void)
return 0;
}
static int nsp_write_lut(void)
{
void __iomem *sku_rom_lut;
phys_addr_t secondary_startup_phy;
if (!secondary_boot_addr) {
pr_warn("required secondary boot register not specified\n");
return -EINVAL;
}
sku_rom_lut = ioremap_nocache((phys_addr_t)secondary_boot_addr,
sizeof(secondary_boot_addr));
if (!sku_rom_lut) {
pr_warn("unable to ioremap SKU-ROM LUT register\n");
return -ENOMEM;
}
secondary_startup_phy = virt_to_phys(secondary_startup);
BUG_ON(secondary_startup_phy > (phys_addr_t)U32_MAX);
writel_relaxed(secondary_startup_phy, sku_rom_lut);
/* Ensure the write is visible to the secondary core */
smp_wmb();
iounmap(sku_rom_lut);
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;
struct device_node *cpus_node = NULL;
struct device_node *cpu_node = NULL;
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);
cpus_node = of_find_node_by_path("/cpus");
if (!cpus_node)
return;
for_each_child_of_node(cpus_node, cpu_node) {
u32 cpuid;
if (of_node_cmp(cpu_node->type, "cpu"))
continue;
if (of_property_read_u32(cpu_node, "reg", &cpuid)) {
pr_debug("%s: missing reg property\n",
cpu_node->full_name);
ret = -ENOENT;
goto out;
}
/*
* 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.
* "secondary-boot-reg" property should be defined only
* for secondary cpu
*/
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 */
if ((cpuid & MPIDR_CPUID_BITMASK) == 1) {
/*
* Our secondary enable method requires a
* "secondary-boot-reg" property to specify a register
* address used to request the ROM code boot a secondary
* core. If we have any trouble getting this we fall
* back to uniprocessor mode.
*/
if (of_property_read_u32(cpu_node,
OF_SECONDARY_BOOT,
&secondary_boot_addr)) {
pr_warn("%s: no" OF_SECONDARY_BOOT "property\n",
cpu_node->name);
ret = -ENOENT;
goto out;
}
}
}
/*
* Enable the SCU on Cortex A9 based SoCs. If -ENOENT is
@ -112,10 +171,11 @@ static void __init bcm_smp_prepare_cpus(unsigned int max_cpus)
*/
ret = scu_a9_enable();
out:
of_node_put(node);
of_node_put(cpu_node);
of_node_put(cpus_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);
}
@ -139,7 +199,7 @@ out:
* - 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)
static int kona_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
void __iomem *boot_reg;
phys_addr_t boot_func;
@ -154,15 +214,16 @@ static int bcm_boot_secondary(unsigned int cpu, struct task_struct *idle)
return -EINVAL;
}
if (!secondary_boot) {
if (!secondary_boot_addr) {
pr_err("required secondary boot register not specified\n");
return -EINVAL;
}
boot_reg = ioremap_nocache((phys_addr_t)secondary_boot, sizeof(u32));
boot_reg = ioremap_nocache(
(phys_addr_t)secondary_boot_addr, sizeof(u32));
if (!boot_reg) {
pr_err("unable to map boot register for cpu %u\n", cpu_id);
return -ENOSYS;
return -ENOMEM;
}
/*
@ -191,12 +252,39 @@ static int bcm_boot_secondary(unsigned int cpu, struct task_struct *idle)
pr_err("timeout waiting for cpu %u to start\n", cpu_id);
return -ENOSYS;
return -ENXIO;
}
static int nsp_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
int ret;
/*
* After wake up, secondary core branches to the startup
* address programmed at SKU ROM LUT location.
*/
ret = nsp_write_lut();
if (ret) {
pr_err("unable to write startup addr to SKU ROM LUT\n");
goto out;
}
/* Send a CPU wakeup interrupt to the secondary core */
arch_send_wakeup_ipi_mask(cpumask_of(cpu));
out:
return ret;
}
static struct smp_operations bcm_smp_ops __initdata = {
.smp_prepare_cpus = bcm_smp_prepare_cpus,
.smp_boot_secondary = bcm_boot_secondary,
.smp_boot_secondary = kona_boot_secondary,
};
CPU_METHOD_OF_DECLARE(bcm_smp_bcm281xx, "brcm,bcm11351-cpu-method",
&bcm_smp_ops);
struct smp_operations nsp_smp_ops __initdata = {
.smp_prepare_cpus = bcm_smp_prepare_cpus,
.smp_boot_secondary = nsp_boot_secondary,
};
CPU_METHOD_OF_DECLARE(bcm_smp_nsp, "brcm,bcm-nsp-smp", &nsp_smp_ops);