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

arch/arm/include/asm/vfp.h

···
  * First, the standard VFP set.
  */
 
+#ifndef __ASM_VFP_H
+#define __ASM_VFP_H
+
 #define FPSID			cr0
 #define FPSCR			cr1
 #define MVFR1			cr6
···
 #define VFPOPDESC_UNUSED_BIT	(24)
 #define VFPOPDESC_UNUSED_MASK	(0xFF << VFPOPDESC_UNUSED_BIT)
 #define VFPOPDESC_OPDESC_MASK	(~(VFPOPDESC_LENGTH_MASK | VFPOPDESC_UNUSED_MASK))
+
+#ifndef __ASSEMBLY__
+void vfp_disable(void);
+#endif
+
+#endif /* __ASM_VFP_H */

arch/arm/mach-bcm/Makefile

···
 obj-$(CONFIG_ARCH_BCM_5301X)	+= bcm_5301x.o
 
 # BCM63XXx
-obj-$(CONFIG_ARCH_BCM_63XX)	:= bcm63xx.o
+ifeq ($(CONFIG_ARCH_BCM_63XX),y)
+CFLAGS_bcm63xx_headsmp.o	+= -march=armv7-a
+obj-y				+= bcm63xx.o
+obj-$(CONFIG_SMP)		+= bcm63xx_smp.o bcm63xx_headsmp.o \
+				   bcm63xx_pmb.o
+endif
 
 ifeq ($(CONFIG_ARCH_BRCMSTB),y)
 CFLAGS_platsmp-brcmstb.o	+= -march=armv7-a

arch/arm/mach-bcm/bcm63xx_headsmp.S

···
+/*
+ *  Copyright (C) 2015, Broadcom Corporation
+ *  All Rights Reserved
+ *
+ * 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 <linux/linkage.h>
+#include <linux/init.h>
+#include <asm/assembler.h>
+
+ENTRY(bcm63138_secondary_startup)
+ ARM_BE8(setend	be)
+	/*
+	 * L1 cache does have unpredictable contents at power-up clean its
+	 * contents without flushing
+	 */
+	bl      v7_invalidate_l1
+	nop
+
+	b	secondary_startup
+ENDPROC(bcm63138_secondary_startup)

arch/arm/mach-bcm/bcm63xx_pmb.c

···
+/*
+ * Broadcom BCM63138 PMB initialization for secondary CPU(s)
+ *
+ * Copyright (C) 2015 Broadcom Corporation
+ * Author: Florian Fainelli <[e-mail]>
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/spinlock.h>
+#include <linux/reset/bcm63xx_pmb.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+#include "bcm63xx_smp.h"
+
+/* ARM Control register definitions */
+#define CORE_PWR_CTRL_SHIFT	0
+#define CORE_PWR_CTRL_MASK	0x3
+#define PLL_PWR_ON		BIT(8)
+#define PLL_LDO_PWR_ON		BIT(9)
+#define PLL_CLAMP_ON		BIT(10)
+#define CPU_RESET_N(x)		BIT(13 + (x))
+#define NEON_RESET_N		BIT(15)
+#define PWR_CTRL_STATUS_SHIFT	28
+#define PWR_CTRL_STATUS_MASK	0x3
+#define PWR_DOWN_SHIFT		30
+#define PWR_DOWN_MASK		0x3
+
+/* CPU Power control register definitions */
+#define MEM_PWR_OK		BIT(0)
+#define MEM_PWR_ON		BIT(1)
+#define MEM_CLAMP_ON		BIT(2)
+#define MEM_PWR_OK_STATUS	BIT(4)
+#define MEM_PWR_ON_STATUS	BIT(5)
+#define MEM_PDA_SHIFT		8
+#define MEM_PDA_MASK		0xf
+#define  MEM_PDA_CPU_MASK	0x1
+#define  MEM_PDA_NEON_MASK	0xf
+#define CLAMP_ON		BIT(15)
+#define PWR_OK_SHIFT		16
+#define PWR_OK_MASK		0xf
+#define PWR_ON_SHIFT		20
+#define  PWR_CPU_MASK		0x03
+#define  PWR_NEON_MASK		0x01
+#define PWR_ON_MASK		0xf
+#define PWR_OK_STATUS_SHIFT	24
+#define PWR_OK_STATUS_MASK	0xf
+#define PWR_ON_STATUS_SHIFT	28
+#define PWR_ON_STATUS_MASK	0xf
+
+#define ARM_CONTROL		0x30
+#define ARM_PWR_CONTROL_BASE	0x34
+#define ARM_PWR_CONTROL(x)	(ARM_PWR_CONTROL_BASE + (x) * 0x4)
+#define ARM_NEON_L2		0x3c
+
+/* Perform a value write, then spin until the value shifted by
+ * shift is seen, masked with mask and is different from cond.
+ */
+static int bpcm_wr_rd_mask(void __iomem *master,
+			   unsigned int addr, u32 off, u32 *val,
+			   u32 shift, u32 mask, u32 cond)
+{
+	int ret;
+
+	ret = bpcm_wr(master, addr, off, *val);
+	if (ret)
+		return ret;
+
+	do {
+		ret = bpcm_rd(master, addr, off, val);
+		if (ret)
+			return ret;
+
+		cpu_relax();
+	} while (((*val >> shift) & mask) != cond);
+
+	return ret;
+}
+
+/* Global lock to serialize accesses to the PMB registers while we
+ * are bringing up the secondary CPU
+ */
+static DEFINE_SPINLOCK(pmb_lock);
+
+static int bcm63xx_pmb_get_resources(struct device_node *dn,
+				     void __iomem **base,
+				     unsigned int *cpu,
+				     unsigned int *addr)
+{
+	struct device_node *pmb_dn;
+	struct of_phandle_args args;
+	int ret;
+
+	ret = of_property_read_u32(dn, "reg", cpu);
+	if (ret) {
+		pr_err("CPU is missing a reg node\n");
+		return ret;
+	}
+
+	ret = of_parse_phandle_with_args(dn, "resets", "#reset-cells",
+					 0, &args);
+	if (ret) {
+		pr_err("CPU is missing a resets phandle\n");
+		return ret;
+	}
+
+	pmb_dn = args.np;
+	if (args.args_count != 2) {
+		pr_err("reset-controller does not conform to reset-cells\n");
+		return -EINVAL;
+	}
+
+	*base = of_iomap(args.np, 0);
+	if (!*base) {
+		pr_err("failed remapping PMB register\n");
+		return -ENOMEM;
+	}
+
+	/* We do not need the number of zones */
+	*addr = args.args[0];
+
+	return 0;
+}
+
+int bcm63xx_pmb_power_on_cpu(struct device_node *dn)
+{
+	void __iomem *base;
+	unsigned int cpu, addr;
+	unsigned long flags;
+	u32 val, ctrl;
+	int ret;
+
+	ret = bcm63xx_pmb_get_resources(dn, &base, &cpu, &addr);
+	if (ret)
+		return ret;
+
+	/* We would not know how to enable a third and greater CPU */
+	WARN_ON(cpu > 1);
+
+	spin_lock_irqsave(&pmb_lock, flags);
+
+	/* Check if the CPU is already on and save the ARM_CONTROL register
+	 * value since we will use it later for CPU de-assert once done with
+	 * the CPU-specific power sequence
+	 */
+	ret = bpcm_rd(base, addr, ARM_CONTROL, &ctrl);
+	if (ret)
+		return ret;
+
+	if (ctrl & CPU_RESET_N(cpu)) {
+		pr_info("PMB: CPU%d is already powered on\n", cpu);
+		ret = 0;
+		goto out;
+	}
+
+	/* Power on PLL */
+	ret = bpcm_rd(base, addr, ARM_PWR_CONTROL(cpu), &val);
+	if (ret)
+		goto out;
+
+	val |= (PWR_CPU_MASK << PWR_ON_SHIFT);
+
+	ret = bpcm_wr_rd_mask(base, addr, ARM_PWR_CONTROL(cpu), &val,
+			PWR_ON_STATUS_SHIFT, PWR_CPU_MASK, PWR_CPU_MASK);
+	if (ret)
+		goto out;
+
+	val |= (PWR_CPU_MASK << PWR_OK_SHIFT);
+
+	ret = bpcm_wr_rd_mask(base, addr, ARM_PWR_CONTROL(cpu), &val,
+			PWR_OK_STATUS_SHIFT, PWR_CPU_MASK, PWR_CPU_MASK);
+	if (ret)
+		goto out;
+
+	val &= ~CLAMP_ON;
+
+	ret = bpcm_wr(base, addr, ARM_PWR_CONTROL(cpu), val);
+	if (ret)
+		goto out;
+
+	/* Power on CPU<N> RAM */
+	val &= ~(MEM_PDA_MASK << MEM_PDA_SHIFT);
+
+	ret = bpcm_wr(base, addr, ARM_PWR_CONTROL(cpu), val);
+	if (ret)
+		goto out;
+
+	val |= MEM_PWR_ON;
+
+	ret = bpcm_wr_rd_mask(base, addr, ARM_PWR_CONTROL(cpu), &val,
+			0, MEM_PWR_ON_STATUS, MEM_PWR_ON_STATUS);
+	if (ret)
+		goto out;
+
+	val |= MEM_PWR_OK;
+
+	ret = bpcm_wr_rd_mask(base, addr, ARM_PWR_CONTROL(cpu), &val,
+			0, MEM_PWR_OK_STATUS, MEM_PWR_OK_STATUS);
+	if (ret)
+		goto out;
+
+	val &= ~MEM_CLAMP_ON;
+
+	ret = bpcm_wr(base, addr, ARM_PWR_CONTROL(cpu), val);
+	if (ret)
+		goto out;
+
+	/* De-assert CPU reset */
+	ctrl |= CPU_RESET_N(cpu);
+
+	ret = bpcm_wr(base, addr, ARM_CONTROL, ctrl);
+out:
+	spin_unlock_irqrestore(&pmb_lock, flags);
+	iounmap(base);
+	return ret;
+}

arch/arm/mach-bcm/bcm63xx_smp.c

···
+/*
+ * 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);

arch/arm/mach-bcm/bcm63xx_smp.h

···
+#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 */

arch/arm/mach-bcm/bcm_5301x.c

···
 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;

arch/arm/vfp/vfpmodule.c

···
 	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)
 {

include/linux/reset/bcm63xx_pmb.h

···
+/*
+ * Broadcom BCM63xx Processor Monitor Bus shared routines (SMP and reset)
+ *
+ * Copyright (C) 2015, Broadcom Corporation
+ * Author: Florian Fainelli <[e-mail]>
+ *
+ * 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 */