Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 194 insertions, 0 deletions

diff --git a/arch/arm/mach-sunxi/platsmp.c b/arch/arm/mach-sunxi/platsmp.c
new file mode 100644
index 000000000..052097e78
--- /dev/null
+++ b/arch/arm/mach-sunxi/platsmp.c
@@ -0,0 +1,194 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * SMP support for Allwinner SoCs
+ *
+ * Copyright (C) 2013 Maxime Ripard
+ *
+ * Maxime Ripard <maxime.ripard@free-electrons.com>
+ *
+ * Based on code
+ *  Copyright (C) 2012-2013 Allwinner Ltd.
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/memory.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/smp.h>
+
+#define CPUCFG_CPU_PWR_CLAMP_STATUS_REG(cpu)	((cpu) * 0x40 + 0x64)
+#define CPUCFG_CPU_RST_CTRL_REG(cpu)		(((cpu) + 1) * 0x40)
+#define CPUCFG_CPU_CTRL_REG(cpu)		(((cpu) + 1) * 0x40 + 0x04)
+#define CPUCFG_CPU_STATUS_REG(cpu)		(((cpu) + 1) * 0x40 + 0x08)
+#define CPUCFG_GEN_CTRL_REG			0x184
+#define CPUCFG_PRIVATE0_REG			0x1a4
+#define CPUCFG_PRIVATE1_REG			0x1a8
+#define CPUCFG_DBG_CTL0_REG			0x1e0
+#define CPUCFG_DBG_CTL1_REG			0x1e4
+
+#define PRCM_CPU_PWROFF_REG			0x100
+#define PRCM_CPU_PWR_CLAMP_REG(cpu)		(((cpu) * 4) + 0x140)
+
+static void __iomem *cpucfg_membase;
+static void __iomem *prcm_membase;
+
+static DEFINE_SPINLOCK(cpu_lock);
+
+static void __init sun6i_smp_prepare_cpus(unsigned int max_cpus)
+{
+	struct device_node *node;
+
+	node = of_find_compatible_node(NULL, NULL, "allwinner,sun6i-a31-prcm");
+	if (!node) {
+		pr_err("Missing A31 PRCM node in the device tree\n");
+		return;
+	}
+
+	prcm_membase = of_iomap(node, 0);
+	of_node_put(node);
+	if (!prcm_membase) {
+		pr_err("Couldn't map A31 PRCM registers\n");
+		return;
+	}
+
+	node = of_find_compatible_node(NULL, NULL,
+				       "allwinner,sun6i-a31-cpuconfig");
+	if (!node) {
+		pr_err("Missing A31 CPU config node in the device tree\n");
+		return;
+	}
+
+	cpucfg_membase = of_iomap(node, 0);
+	of_node_put(node);
+	if (!cpucfg_membase)
+		pr_err("Couldn't map A31 CPU config registers\n");
+
+}
+
+static int sun6i_smp_boot_secondary(unsigned int cpu,
+				    struct task_struct *idle)
+{
+	u32 reg;
+	int i;
+
+	if (!(prcm_membase && cpucfg_membase))
+		return -EFAULT;
+
+	spin_lock(&cpu_lock);
+
+	/* Set CPU boot address */
+	writel(__pa_symbol(secondary_startup),
+	       cpucfg_membase + CPUCFG_PRIVATE0_REG);
+
+	/* Assert the CPU core in reset */
+	writel(0, cpucfg_membase + CPUCFG_CPU_RST_CTRL_REG(cpu));
+
+	/* Assert the L1 cache in reset */
+	reg = readl(cpucfg_membase + CPUCFG_GEN_CTRL_REG);
+	writel(reg & ~BIT(cpu), cpucfg_membase + CPUCFG_GEN_CTRL_REG);
+
+	/* Disable external debug access */
+	reg = readl(cpucfg_membase + CPUCFG_DBG_CTL1_REG);
+	writel(reg & ~BIT(cpu), cpucfg_membase + CPUCFG_DBG_CTL1_REG);
+
+	/* Power up the CPU */
+	for (i = 0; i <= 8; i++)
+		writel(0xff >> i, prcm_membase + PRCM_CPU_PWR_CLAMP_REG(cpu));
+	mdelay(10);
+
+	/* Clear CPU power-off gating */
+	reg = readl(prcm_membase + PRCM_CPU_PWROFF_REG);
+	writel(reg & ~BIT(cpu), prcm_membase + PRCM_CPU_PWROFF_REG);
+	mdelay(1);
+
+	/* Deassert the CPU core reset */
+	writel(3, cpucfg_membase + CPUCFG_CPU_RST_CTRL_REG(cpu));
+
+	/* Enable back the external debug accesses */
+	reg = readl(cpucfg_membase + CPUCFG_DBG_CTL1_REG);
+	writel(reg | BIT(cpu), cpucfg_membase + CPUCFG_DBG_CTL1_REG);
+
+	spin_unlock(&cpu_lock);
+
+	return 0;
+}
+
+static const struct smp_operations sun6i_smp_ops __initconst = {
+	.smp_prepare_cpus	= sun6i_smp_prepare_cpus,
+	.smp_boot_secondary	= sun6i_smp_boot_secondary,
+};
+CPU_METHOD_OF_DECLARE(sun6i_a31_smp, "allwinner,sun6i-a31", &sun6i_smp_ops);
+
+static void __init sun8i_smp_prepare_cpus(unsigned int max_cpus)
+{
+	struct device_node *node;
+
+	node = of_find_compatible_node(NULL, NULL, "allwinner,sun8i-a23-prcm");
+	if (!node) {
+		pr_err("Missing A23 PRCM node in the device tree\n");
+		return;
+	}
+
+	prcm_membase = of_iomap(node, 0);
+	of_node_put(node);
+	if (!prcm_membase) {
+		pr_err("Couldn't map A23 PRCM registers\n");
+		return;
+	}
+
+	node = of_find_compatible_node(NULL, NULL,
+				       "allwinner,sun8i-a23-cpuconfig");
+	if (!node) {
+		pr_err("Missing A23 CPU config node in the device tree\n");
+		return;
+	}
+
+	cpucfg_membase = of_iomap(node, 0);
+	of_node_put(node);
+	if (!cpucfg_membase)
+		pr_err("Couldn't map A23 CPU config registers\n");
+
+}
+
+static int sun8i_smp_boot_secondary(unsigned int cpu,
+				    struct task_struct *idle)
+{
+	u32 reg;
+
+	if (!(prcm_membase && cpucfg_membase))
+		return -EFAULT;
+
+	spin_lock(&cpu_lock);
+
+	/* Set CPU boot address */
+	writel(__pa_symbol(secondary_startup),
+	       cpucfg_membase + CPUCFG_PRIVATE0_REG);
+
+	/* Assert the CPU core in reset */
+	writel(0, cpucfg_membase + CPUCFG_CPU_RST_CTRL_REG(cpu));
+
+	/* Assert the L1 cache in reset */
+	reg = readl(cpucfg_membase + CPUCFG_GEN_CTRL_REG);
+	writel(reg & ~BIT(cpu), cpucfg_membase + CPUCFG_GEN_CTRL_REG);
+
+	/* Clear CPU power-off gating */
+	reg = readl(prcm_membase + PRCM_CPU_PWROFF_REG);
+	writel(reg & ~BIT(cpu), prcm_membase + PRCM_CPU_PWROFF_REG);
+	mdelay(1);
+
+	/* Deassert the CPU core reset */
+	writel(3, cpucfg_membase + CPUCFG_CPU_RST_CTRL_REG(cpu));
+
+	spin_unlock(&cpu_lock);
+
+	return 0;
+}
+
+static const struct smp_operations sun8i_smp_ops __initconst = {
+	.smp_prepare_cpus	= sun8i_smp_prepare_cpus,
+	.smp_boot_secondary	= sun8i_smp_boot_secondary,
+};
+CPU_METHOD_OF_DECLARE(sun8i_a23_smp, "allwinner,sun8i-a23", &sun8i_smp_ops);