Merge tag 'arm-soc/for-4.2/soc-take2' of http://github.com/broadcom/stblinux into next/soc
Merge mach-bcm changes from Florian Fainelli: This pull request contains the following changes: - Rafal adds an additional fault code to be ignored by the kernel on BCM5301X SoC - BCM63138 SMP support which: * common code to control the PMB bus, to be shared with a reset controller driver in drivers/reset * secondary CPU initialization sequence using PMB helpers * small changes suggested by Russell King to allow platforms to disable VFP * tag 'arm-soc/for-4.2/soc-take2' of http://github.com/broadcom/stblinux: ARM: BCM63xx: Add SMP support for BCM63138 ARM: vfp: Add vfp_disable for problematic platforms ARM: vfp: Add include guards ARM: BCM63xx: Add secondary CPU PMB initialization sequence ARM: BCM63xx: Add Broadcom BCM63xx PMB controller helpers ARM: BCM5301X: Ignore another (BCM4709 specific) fault code
This commit is contained in:
Arnd Bergmann
commit
a4526915b6
@ -5,6 +5,9 @@
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* First, the standard VFP set.
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*/
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#ifndef __ASM_VFP_H
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#define __ASM_VFP_H
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#define FPSID cr0
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#define FPSCR cr1
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#define MVFR1 cr6
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@ -87,3 +90,9 @@
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#define VFPOPDESC_UNUSED_BIT (24)
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#define VFPOPDESC_UNUSED_MASK (0xFF << VFPOPDESC_UNUSED_BIT)
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#define VFPOPDESC_OPDESC_MASK (~(VFPOPDESC_LENGTH_MASK | VFPOPDESC_UNUSED_MASK))
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#ifndef __ASSEMBLY__
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void vfp_disable(void);
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#endif
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#endif /* __ASM_VFP_H */
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@ -38,7 +38,12 @@ obj-$(CONFIG_ARCH_BCM2835) += board_bcm2835.o
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obj-$(CONFIG_ARCH_BCM_5301X) += bcm_5301x.o
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# BCM63XXx
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obj-$(CONFIG_ARCH_BCM_63XX) := bcm63xx.o
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ifeq ($(CONFIG_ARCH_BCM_63XX),y)
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CFLAGS_bcm63xx_headsmp.o += -march=armv7-a
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obj-y += bcm63xx.o
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obj-$(CONFIG_SMP) += bcm63xx_smp.o bcm63xx_headsmp.o \
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bcm63xx_pmb.o
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endif
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ifeq ($(CONFIG_ARCH_BRCMSTB),y)
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CFLAGS_platsmp-brcmstb.o += -march=armv7-a
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23
arch/arm/mach-bcm/bcm63xx_headsmp.S
Normal file
23
arch/arm/mach-bcm/bcm63xx_headsmp.S
Normal file
@ -0,0 +1,23 @@
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/*
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* Copyright (C) 2015, Broadcom Corporation
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/linkage.h>
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#include <linux/init.h>
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#include <asm/assembler.h>
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ENTRY(bcm63138_secondary_startup)
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ARM_BE8(setend be)
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/*
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* L1 cache does have unpredictable contents at power-up clean its
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* contents without flushing
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*/
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bl v7_invalidate_l1
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nop
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b secondary_startup
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ENDPROC(bcm63138_secondary_startup)
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221
arch/arm/mach-bcm/bcm63xx_pmb.c
Normal file
221
arch/arm/mach-bcm/bcm63xx_pmb.c
Normal file
@ -0,0 +1,221 @@
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/*
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* Broadcom BCM63138 PMB initialization for secondary CPU(s)
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*
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* Copyright (C) 2015 Broadcom Corporation
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* Author: Florian Fainelli <f.fainelli@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/io.h>
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#include <linux/spinlock.h>
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#include <linux/reset/bcm63xx_pmb.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include "bcm63xx_smp.h"
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/* ARM Control register definitions */
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#define CORE_PWR_CTRL_SHIFT 0
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#define CORE_PWR_CTRL_MASK 0x3
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#define PLL_PWR_ON BIT(8)
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#define PLL_LDO_PWR_ON BIT(9)
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#define PLL_CLAMP_ON BIT(10)
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#define CPU_RESET_N(x) BIT(13 + (x))
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#define NEON_RESET_N BIT(15)
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#define PWR_CTRL_STATUS_SHIFT 28
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#define PWR_CTRL_STATUS_MASK 0x3
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#define PWR_DOWN_SHIFT 30
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#define PWR_DOWN_MASK 0x3
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/* CPU Power control register definitions */
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#define MEM_PWR_OK BIT(0)
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#define MEM_PWR_ON BIT(1)
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#define MEM_CLAMP_ON BIT(2)
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#define MEM_PWR_OK_STATUS BIT(4)
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#define MEM_PWR_ON_STATUS BIT(5)
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#define MEM_PDA_SHIFT 8
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#define MEM_PDA_MASK 0xf
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#define MEM_PDA_CPU_MASK 0x1
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#define MEM_PDA_NEON_MASK 0xf
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#define CLAMP_ON BIT(15)
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#define PWR_OK_SHIFT 16
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#define PWR_OK_MASK 0xf
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#define PWR_ON_SHIFT 20
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#define PWR_CPU_MASK 0x03
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#define PWR_NEON_MASK 0x01
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#define PWR_ON_MASK 0xf
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#define PWR_OK_STATUS_SHIFT 24
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#define PWR_OK_STATUS_MASK 0xf
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#define PWR_ON_STATUS_SHIFT 28
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#define PWR_ON_STATUS_MASK 0xf
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#define ARM_CONTROL 0x30
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#define ARM_PWR_CONTROL_BASE 0x34
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#define ARM_PWR_CONTROL(x) (ARM_PWR_CONTROL_BASE + (x) * 0x4)
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#define ARM_NEON_L2 0x3c
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/* Perform a value write, then spin until the value shifted by
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* shift is seen, masked with mask and is different from cond.
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*/
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static int bpcm_wr_rd_mask(void __iomem *master,
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unsigned int addr, u32 off, u32 *val,
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u32 shift, u32 mask, u32 cond)
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{
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int ret;
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ret = bpcm_wr(master, addr, off, *val);
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if (ret)
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return ret;
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do {
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ret = bpcm_rd(master, addr, off, val);
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if (ret)
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return ret;
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cpu_relax();
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} while (((*val >> shift) & mask) != cond);
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return ret;
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}
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/* Global lock to serialize accesses to the PMB registers while we
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* are bringing up the secondary CPU
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*/
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static DEFINE_SPINLOCK(pmb_lock);
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static int bcm63xx_pmb_get_resources(struct device_node *dn,
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void __iomem **base,
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unsigned int *cpu,
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unsigned int *addr)
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{
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struct device_node *pmb_dn;
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struct of_phandle_args args;
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int ret;
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ret = of_property_read_u32(dn, "reg", cpu);
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if (ret) {
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pr_err("CPU is missing a reg node\n");
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return ret;
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}
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ret = of_parse_phandle_with_args(dn, "resets", "#reset-cells",
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0, &args);
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if (ret) {
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pr_err("CPU is missing a resets phandle\n");
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return ret;
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}
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pmb_dn = args.np;
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if (args.args_count != 2) {
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pr_err("reset-controller does not conform to reset-cells\n");
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return -EINVAL;
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}
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*base = of_iomap(args.np, 0);
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if (!*base) {
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pr_err("failed remapping PMB register\n");
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return -ENOMEM;
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}
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/* We do not need the number of zones */
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*addr = args.args[0];
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return 0;
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}
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int bcm63xx_pmb_power_on_cpu(struct device_node *dn)
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{
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void __iomem *base;
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unsigned int cpu, addr;
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unsigned long flags;
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u32 val, ctrl;
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int ret;
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ret = bcm63xx_pmb_get_resources(dn, &base, &cpu, &addr);
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if (ret)
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return ret;
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/* We would not know how to enable a third and greater CPU */
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WARN_ON(cpu > 1);
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spin_lock_irqsave(&pmb_lock, flags);
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/* Check if the CPU is already on and save the ARM_CONTROL register
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* value since we will use it later for CPU de-assert once done with
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* the CPU-specific power sequence
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*/
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ret = bpcm_rd(base, addr, ARM_CONTROL, &ctrl);
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if (ret)
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return ret;
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if (ctrl & CPU_RESET_N(cpu)) {
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pr_info("PMB: CPU%d is already powered on\n", cpu);
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ret = 0;
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goto out;
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}
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/* Power on PLL */
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ret = bpcm_rd(base, addr, ARM_PWR_CONTROL(cpu), &val);
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if (ret)
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goto out;
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val |= (PWR_CPU_MASK << PWR_ON_SHIFT);
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ret = bpcm_wr_rd_mask(base, addr, ARM_PWR_CONTROL(cpu), &val,
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PWR_ON_STATUS_SHIFT, PWR_CPU_MASK, PWR_CPU_MASK);
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if (ret)
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goto out;
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val |= (PWR_CPU_MASK << PWR_OK_SHIFT);
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ret = bpcm_wr_rd_mask(base, addr, ARM_PWR_CONTROL(cpu), &val,
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PWR_OK_STATUS_SHIFT, PWR_CPU_MASK, PWR_CPU_MASK);
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if (ret)
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goto out;
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val &= ~CLAMP_ON;
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ret = bpcm_wr(base, addr, ARM_PWR_CONTROL(cpu), val);
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if (ret)
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goto out;
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/* Power on CPU<N> RAM */
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val &= ~(MEM_PDA_MASK << MEM_PDA_SHIFT);
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ret = bpcm_wr(base, addr, ARM_PWR_CONTROL(cpu), val);
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if (ret)
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goto out;
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val |= MEM_PWR_ON;
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ret = bpcm_wr_rd_mask(base, addr, ARM_PWR_CONTROL(cpu), &val,
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0, MEM_PWR_ON_STATUS, MEM_PWR_ON_STATUS);
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if (ret)
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goto out;
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val |= MEM_PWR_OK;
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ret = bpcm_wr_rd_mask(base, addr, ARM_PWR_CONTROL(cpu), &val,
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0, MEM_PWR_OK_STATUS, MEM_PWR_OK_STATUS);
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if (ret)
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goto out;
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val &= ~MEM_CLAMP_ON;
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ret = bpcm_wr(base, addr, ARM_PWR_CONTROL(cpu), val);
|
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if (ret)
|
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goto out;
|
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/* De-assert CPU reset */
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ctrl |= CPU_RESET_N(cpu);
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|
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ret = bpcm_wr(base, addr, ARM_CONTROL, ctrl);
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out:
|
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spin_unlock_irqrestore(&pmb_lock, flags);
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iounmap(base);
|
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return ret;
|
||||
}
|
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169
arch/arm/mach-bcm/bcm63xx_smp.c
Normal file
169
arch/arm/mach-bcm/bcm63xx_smp.c
Normal file
@ -0,0 +1,169 @@
|
||||
/*
|
||||
* Broadcom BCM63138 DSL SoCs SMP support code
|
||||
*
|
||||
* Copyright (C) 2015, Broadcom Corporation
|
||||
*
|
||||
* Licensed under the terms of the GPLv2
|
||||
*/
|
||||
|
||||
#include <linux/delay.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/smp.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/of.h>
|
||||
#include <linux/of_address.h>
|
||||
|
||||
#include <asm/cacheflush.h>
|
||||
#include <asm/smp_scu.h>
|
||||
#include <asm/smp_plat.h>
|
||||
#include <asm/vfp.h>
|
||||
|
||||
#include "bcm63xx_smp.h"
|
||||
|
||||
/* Size of mapped Cortex A9 SCU address space */
|
||||
#define CORTEX_A9_SCU_SIZE 0x58
|
||||
|
||||
/*
|
||||
* 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;
|
||||
unsigned int i, ncores;
|
||||
|
||||
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);
|
||||
|
||||
ncores = scu_base ? scu_get_core_count(scu_base) : 1;
|
||||
|
||||
if (ncores > nr_cpu_ids) {
|
||||
pr_warn("SMP: %u cores greater than maximum (%u), clipping\n",
|
||||
ncores, nr_cpu_ids);
|
||||
ncores = nr_cpu_ids;
|
||||
}
|
||||
|
||||
/* The BCM63138 SoC has two Cortex-A9 CPUs, CPU0 features a complete
|
||||
* and fully functional VFP unit that can be used, but CPU1 does not.
|
||||
* Since we will not be able to trap kernel-mode NEON to force
|
||||
* migration to CPU0, just do not advertise VFP support at all.
|
||||
*
|
||||
* This will make vfp_init bail out and do not attempt to use VFP at
|
||||
* all, for kernel-mode NEON, we do not want to introduce any
|
||||
* conditionals in hot-paths, so we just restrict the system to UP.
|
||||
*/
|
||||
#ifdef CONFIG_VFP
|
||||
if (ncores > 1) {
|
||||
pr_warn("SMP: secondary CPUs lack VFP unit, disabling VFP\n");
|
||||
vfp_disable();
|
||||
|
||||
#ifdef CONFIG_KERNEL_MODE_NEON
|
||||
WARN(1, "SMP: kernel-mode NEON enabled, restricting to UP\n");
|
||||
ncores = 1;
|
||||
#endif
|
||||
}
|
||||
#endif
|
||||
|
||||
for (i = 0; i < ncores; i++)
|
||||
set_cpu_possible(i, true);
|
||||
|
||||
iounmap(scu_base); /* That's the last we'll need of this */
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct of_device_id bcm63138_bootlut_ids[] = {
|
||||
{ .compatible = "brcm,bcm63138-bootlut", },
|
||||
{ /* sentinel */ },
|
||||
};
|
||||
|
||||
#define BOOTLUT_RESET_VECT 0x20
|
||||
|
||||
static int bcm63138_smp_boot_secondary(unsigned int cpu,
|
||||
struct task_struct *idle)
|
||||
{
|
||||
void __iomem *bootlut_base;
|
||||
struct device_node *dn;
|
||||
int ret = 0;
|
||||
u32 val;
|
||||
|
||||
dn = of_find_matching_node(NULL, bcm63138_bootlut_ids);
|
||||
if (!dn) {
|
||||
pr_err("SMP: unable to find bcm63138 boot LUT node\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
bootlut_base = of_iomap(dn, 0);
|
||||
of_node_put(dn);
|
||||
|
||||
if (!bootlut_base) {
|
||||
pr_err("SMP: unable to remap boot LUT base register\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
/* Locate the secondary CPU node */
|
||||
dn = of_get_cpu_node(cpu_logical_map(cpu), NULL);
|
||||
if (!dn) {
|
||||
pr_err("SMP: failed to locate secondary CPU%d node\n", cpu);
|
||||
ret = -ENODEV;
|
||||
goto out;
|
||||
}
|
||||
|
||||
/* Write the secondary init routine to the BootLUT reset vector */
|
||||
val = virt_to_phys(bcm63138_secondary_startup);
|
||||
writel_relaxed(val, bootlut_base + BOOTLUT_RESET_VECT);
|
||||
|
||||
/* Power up the core, will jump straight to its reset vector when we
|
||||
* return
|
||||
*/
|
||||
ret = bcm63xx_pmb_power_on_cpu(dn);
|
||||
if (ret)
|
||||
goto out;
|
||||
out:
|
||||
iounmap(bootlut_base);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void __init bcm63138_smp_prepare_cpus(unsigned int max_cpus)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = scu_a9_enable();
|
||||
if (ret) {
|
||||
pr_warn("SMP: Cortex-A9 SCU setup failed\n");
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
struct smp_operations bcm63138_smp_ops __initdata = {
|
||||
.smp_prepare_cpus = bcm63138_smp_prepare_cpus,
|
||||
.smp_boot_secondary = bcm63138_smp_boot_secondary,
|
||||
};
|
||||
|
||||
CPU_METHOD_OF_DECLARE(bcm63138_smp, "brcm,bcm63138", &bcm63138_smp_ops);
|
||||
9
arch/arm/mach-bcm/bcm63xx_smp.h
Normal file
9
arch/arm/mach-bcm/bcm63xx_smp.h
Normal file
@ -0,0 +1,9 @@
|
||||
#ifndef __BCM63XX_SMP_H
|
||||
#define __BCM63XX_SMP_H
|
||||
|
||||
struct device_node;
|
||||
|
||||
extern void bcm63138_secondary_startup(void);
|
||||
extern int bcm63xx_pmb_power_on_cpu(struct device_node *dn);
|
||||
|
||||
#endif /* __BCM63XX_SMP_H */
|
||||
@ -18,15 +18,16 @@ static bool first_fault = true;
|
||||
static int bcm5301x_abort_handler(unsigned long addr, unsigned int fsr,
|
||||
struct pt_regs *regs)
|
||||
{
|
||||
if (fsr == 0x1c06 && first_fault) {
|
||||
if ((fsr == 0x1406 || fsr == 0x1c06) && first_fault) {
|
||||
first_fault = false;
|
||||
|
||||
/*
|
||||
* These faults with code 0x1c06 happens for no good reason,
|
||||
* possibly left over from the CFE boot loader.
|
||||
* 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);
|
||||
addr, fsr);
|
||||
|
||||
/* Returning non-zero causes fault display and panic */
|
||||
return 0;
|
||||
|
||||
@ -445,6 +445,19 @@ static void vfp_enable(void *unused)
|
||||
set_copro_access(access | CPACC_FULL(10) | CPACC_FULL(11));
|
||||
}
|
||||
|
||||
/* Called by platforms on which we want to disable VFP because it may not be
|
||||
* present on all CPUs within a SMP complex. Needs to be called prior to
|
||||
* vfp_init().
|
||||
*/
|
||||
void vfp_disable(void)
|
||||
{
|
||||
if (VFP_arch) {
|
||||
pr_debug("%s: should be called prior to vfp_init\n", __func__);
|
||||
return;
|
||||
}
|
||||
VFP_arch = 1;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_CPU_PM
|
||||
static int vfp_pm_suspend(void)
|
||||
{
|
||||
|
||||
88
include/linux/reset/bcm63xx_pmb.h
Normal file
88
include/linux/reset/bcm63xx_pmb.h
Normal file
@ -0,0 +1,88 @@
|
||||
/*
|
||||
* Broadcom BCM63xx Processor Monitor Bus shared routines (SMP and reset)
|
||||
*
|
||||
* Copyright (C) 2015, Broadcom Corporation
|
||||
* Author: Florian Fainelli <f.fainelli@gmail.com>
|
||||
*
|
||||
* 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 __BCM63XX_PMB_H
|
||||
#define __BCM63XX_PMB_H
|
||||
|
||||
#include <linux/io.h>
|
||||
#include <linux/types.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/err.h>
|
||||
|
||||
/* PMB Master controller register */
|
||||
#define PMB_CTRL 0x00
|
||||
#define PMC_PMBM_START (1 << 31)
|
||||
#define PMC_PMBM_TIMEOUT (1 << 30)
|
||||
#define PMC_PMBM_SLAVE_ERR (1 << 29)
|
||||
#define PMC_PMBM_BUSY (1 << 28)
|
||||
#define PMC_PMBM_READ (0 << 20)
|
||||
#define PMC_PMBM_WRITE (1 << 20)
|
||||
#define PMB_WR_DATA 0x04
|
||||
#define PMB_TIMEOUT 0x08
|
||||
#define PMB_RD_DATA 0x0C
|
||||
|
||||
#define PMB_BUS_ID_SHIFT 8
|
||||
|
||||
/* Perform the low-level PMB master operation, shared between reads and
|
||||
* writes.
|
||||
*/
|
||||
static inline int __bpcm_do_op(void __iomem *master, unsigned int addr,
|
||||
u32 off, u32 op)
|
||||
{
|
||||
unsigned int timeout = 1000;
|
||||
u32 cmd;
|
||||
|
||||
cmd = (PMC_PMBM_START | op | (addr & 0xff) << 12 | off);
|
||||
writel(cmd, master + PMB_CTRL);
|
||||
do {
|
||||
cmd = readl(master + PMB_CTRL);
|
||||
if (!(cmd & PMC_PMBM_START))
|
||||
return 0;
|
||||
|
||||
if (cmd & PMC_PMBM_SLAVE_ERR)
|
||||
return -EIO;
|
||||
|
||||
if (cmd & PMC_PMBM_TIMEOUT)
|
||||
return -ETIMEDOUT;
|
||||
|
||||
udelay(1);
|
||||
} while (timeout-- > 0);
|
||||
|
||||
return -ETIMEDOUT;
|
||||
}
|
||||
|
||||
static inline int bpcm_rd(void __iomem *master, unsigned int addr,
|
||||
u32 off, u32 *val)
|
||||
{
|
||||
int ret = 0;
|
||||
|
||||
ret = __bpcm_do_op(master, addr, off >> 2, PMC_PMBM_READ);
|
||||
*val = readl(master + PMB_RD_DATA);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline int bpcm_wr(void __iomem *master, unsigned int addr,
|
||||
u32 off, u32 val)
|
||||
{
|
||||
int ret = 0;
|
||||
|
||||
writel(val, master + PMB_WR_DATA);
|
||||
ret = __bpcm_do_op(master, addr, off >> 2, PMC_PMBM_WRITE);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
#endif /* __BCM63XX_PMB_H */
|
||||
Loading…
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Reference in New Issue
Block a user