Merge tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc

Pull ARM SoC platform updates from Arnd Bergmann:
 "SoC platform changes (arch/arm/mach-*). This merge window, the bulk is
  for a few platforms:

   - Andres Färber adds initial support for the Actions Semi S500 (aka
     'owl') platform, a close relative of the S900 platform he adds for
     arm64.

   - in mach-omap2, we remove more legacy code

   - Rockchips gains support for the RV1108 SoC designed for camera
     applications.

   - For Atmel, we gain support for MMU-less SoCs (SAME70/V71/S70/V70)

   - Minor updates for other platforms, including davinci, s3c64xx,
     prima2, stm32, broadcom nsp, amlogic, pxa, imx and renesas"

* tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (74 commits)
  ARM: owl: smp: Drop bogus holding pen
  ARM: owl: Drop custom machine
  ARM: owl: smp: Implement SPS power-gating for CPU2 and CPU3
  soc: actions: owl-sps: Factor out owl_sps_set_pg() for power-gating
  soc: actions: Add Owl SPS
  dt-bindings: power: Add Owl SPS power domains
  MAINTAINERS: Update Actions Semi section with SPS
  ARM: owl: Implement CPU enable-method for S500
  MAINTAINERS: Add Actions Semi Owl section
  ARM: Prepare Actions Semi S500
  ARM: socfpga: Increase max number of GPIOs
  ARM: stm32: Introduce MACH_STM32F469 flag
  ARM: prima2: remove redundant select CPU_V7
  ARM: davinci: fix const warnings
  ARM: shmobile: pm-rmobile: Use GENPD_FLAG_ALWAYS_ON
  ARM: OMAP4: hwmod_data: add SHAM crypto accelerator
  ARM: OMAP4: hwmod data: add des
  ARM: OMAP4: hwmod data: add aes2
  ARM: OMAP4: hwmod data: add aes1
  ARM: pxa: Delete an error message for a failed memory allocation in pxa3xx_u2d_probe()
  ...

1 files changed, 171 insertions, 0 deletions

diff --git a/arch/arm/mach-actions/platsmp.c b/arch/arm/mach-actions/platsmp.c
new file mode 100644
index 000000000000..12a9e331b432
--- /dev/null
+++ b/arch/arm/mach-actions/platsmp.c
@@ -0,0 +1,171 @@
+/*
+ * Actions Semi Leopard
+ *
+ * This file is based on arm realview smp platform.
+ *
+ * Copyright 2012 Actions Semi Inc.
+ * Author: Actions Semi, Inc.
+ *
+ * Copyright (c) 2017 Andreas Färber
+ *
+ * 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/delay.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/smp.h>
+#include <linux/soc/actions/owl-sps.h>
+#include <asm/cacheflush.h>
+#include <asm/smp_plat.h>
+#include <asm/smp_scu.h>
+
+#define OWL_CPU1_ADDR	0x50
+#define OWL_CPU1_FLAG	0x5c
+
+#define OWL_CPUx_FLAG_BOOT	0x55aa
+
+#define OWL_SPS_PG_CTL_PWR_CPU2	BIT(5)
+#define OWL_SPS_PG_CTL_PWR_CPU3	BIT(6)
+#define OWL_SPS_PG_CTL_ACK_CPU2	BIT(21)
+#define OWL_SPS_PG_CTL_ACK_CPU3	BIT(22)
+
+static void __iomem *scu_base_addr;
+static void __iomem *sps_base_addr;
+static void __iomem *timer_base_addr;
+static int ncores;
+
+static DEFINE_SPINLOCK(boot_lock);
+
+void owl_secondary_startup(void);
+
+static int s500_wakeup_secondary(unsigned int cpu)
+{
+	int ret;
+
+	if (cpu > 3)
+		return -EINVAL;
+
+	/* The generic PM domain driver is not available this early. */
+	switch (cpu) {
+	case 2:
+		ret = owl_sps_set_pg(sps_base_addr,
+		                     OWL_SPS_PG_CTL_PWR_CPU2,
+				     OWL_SPS_PG_CTL_ACK_CPU2, true);
+		if (ret)
+			return ret;
+		break;
+	case 3:
+		ret = owl_sps_set_pg(sps_base_addr,
+		                     OWL_SPS_PG_CTL_PWR_CPU3,
+				     OWL_SPS_PG_CTL_ACK_CPU3, true);
+		if (ret)
+			return ret;
+		break;
+	}
+
+	/* wait for CPUx to run to WFE instruction */
+	udelay(200);
+
+	writel(virt_to_phys(owl_secondary_startup),
+	       timer_base_addr + OWL_CPU1_ADDR + (cpu - 1) * 4);
+	writel(OWL_CPUx_FLAG_BOOT,
+	       timer_base_addr + OWL_CPU1_FLAG + (cpu - 1) * 4);
+
+	dsb_sev();
+	mb();
+
+	return 0;
+}
+
+static int s500_smp_boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+	unsigned long timeout;
+	int ret;
+
+	ret = s500_wakeup_secondary(cpu);
+	if (ret)
+		return ret;
+
+	udelay(10);
+
+	spin_lock(&boot_lock);
+
+	smp_send_reschedule(cpu);
+
+	timeout = jiffies + (1 * HZ);
+	while (time_before(jiffies, timeout)) {
+		if (pen_release == -1)
+			break;
+	}
+
+	writel(0, timer_base_addr + OWL_CPU1_ADDR + (cpu - 1) * 4);
+	writel(0, timer_base_addr + OWL_CPU1_FLAG + (cpu - 1) * 4);
+
+	spin_unlock(&boot_lock);
+
+	return 0;
+}
+
+static void __init s500_smp_prepare_cpus(unsigned int max_cpus)
+{
+	struct device_node *node;
+
+	node = of_find_compatible_node(NULL, NULL, "actions,s500-timer");
+	if (!node) {
+		pr_err("%s: missing timer\n", __func__);
+		return;
+	}
+
+	timer_base_addr = of_iomap(node, 0);
+	if (!timer_base_addr) {
+		pr_err("%s: could not map timer registers\n", __func__);
+		return;
+	}
+
+	node = of_find_compatible_node(NULL, NULL, "actions,s500-sps");
+	if (!node) {
+		pr_err("%s: missing sps\n", __func__);
+		return;
+	}
+
+	sps_base_addr = of_iomap(node, 0);
+	if (!sps_base_addr) {
+		pr_err("%s: could not map sps registers\n", __func__);
+		return;
+	}
+
+	if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9) {
+		node = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
+		if (!node) {
+			pr_err("%s: missing scu\n", __func__);
+			return;
+		}
+
+		scu_base_addr = of_iomap(node, 0);
+		if (!scu_base_addr) {
+			pr_err("%s: could not map scu registers\n", __func__);
+			return;
+		}
+
+		/*
+		 * While the number of cpus is gathered from dt, also get the
+		 * number of cores from the scu to verify this value when
+		 * booting the cores.
+		 */
+		ncores = scu_get_core_count(scu_base_addr);
+		pr_debug("%s: ncores %d\n", __func__, ncores);
+
+		scu_enable(scu_base_addr);
+	}
+}
+
+static const struct smp_operations s500_smp_ops __initconst = {
+	.smp_prepare_cpus = s500_smp_prepare_cpus,
+	.smp_boot_secondary = s500_smp_boot_secondary,
+};
+CPU_METHOD_OF_DECLARE(s500_smp, "actions,s500-smp", &s500_smp_ops);