1 files changed, 0 insertions, 263 deletions
diff --git a/arch/arm/mach-vexpress/tc2_pm.c b/arch/arm/mach-vexpress/tc2_pm.c
deleted file mode 100644
index e96c42ae3602..000000000000
--- a/arch/arm/mach-vexpress/tc2_pm.c
+++ /dev/null
@@ -1,263 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * arch/arm/mach-vexpress/tc2_pm.c - TC2 power management support
- *
- * Created by:	Nicolas Pitre, October 2012
- * Copyright:	(C) 2012-2013  Linaro Limited
- *
- * Some portions of this file were originally written by Achin Gupta
- * Copyright:   (C) 2012  ARM Limited
- */
-
-#include <linux/delay.h>
-#include <linux/init.h>
-#include <linux/io.h>
-#include <linux/kernel.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
-#include <linux/errno.h>
-#include <linux/irqchip/arm-gic.h>
-
-#include <asm/mcpm.h>
-#include <asm/proc-fns.h>
-#include <asm/cacheflush.h>
-#include <asm/cputype.h>
-#include <asm/cp15.h>
-
-#include <linux/arm-cci.h>
-
-#include "spc.h"
-
-/* SCC conf registers */
-#define RESET_CTRL		0x018
-#define RESET_A15_NCORERESET(cpu)	(1 << (2 + (cpu)))
-#define RESET_A7_NCORERESET(cpu)	(1 << (16 + (cpu)))
-
-#define A15_CONF		0x400
-#define A7_CONF			0x500
-#define SYS_INFO		0x700
-#define SPC_BASE		0xb00
-
-static void __iomem *scc;
-
-#define TC2_CLUSTERS			2
-#define TC2_MAX_CPUS_PER_CLUSTER	3
-
-static unsigned int tc2_nr_cpus[TC2_CLUSTERS];
-
-static int tc2_pm_cpu_powerup(unsigned int cpu, unsigned int cluster)
-{
-	pr_debug("%s: cpu %u cluster %u\n", __func__, cpu, cluster);
-	if (cluster >= TC2_CLUSTERS || cpu >= tc2_nr_cpus[cluster])
-		return -EINVAL;
-	ve_spc_set_resume_addr(cluster, cpu,
-			       __pa_symbol(mcpm_entry_point));
-	ve_spc_cpu_wakeup_irq(cluster, cpu, true);
-	return 0;
-}
-
-static int tc2_pm_cluster_powerup(unsigned int cluster)
-{
-	pr_debug("%s: cluster %u\n", __func__, cluster);
-	if (cluster >= TC2_CLUSTERS)
-		return -EINVAL;
-	ve_spc_powerdown(cluster, false);
-	return 0;
-}
-
-static void tc2_pm_cpu_powerdown_prepare(unsigned int cpu, unsigned int cluster)
-{
-	pr_debug("%s: cpu %u cluster %u\n", __func__, cpu, cluster);
-	BUG_ON(cluster >= TC2_CLUSTERS || cpu >= TC2_MAX_CPUS_PER_CLUSTER);
-	ve_spc_cpu_wakeup_irq(cluster, cpu, true);
-	/*
-	 * If the CPU is committed to power down, make sure
-	 * the power controller will be in charge of waking it
-	 * up upon IRQ, ie IRQ lines are cut from GIC CPU IF
-	 * to the CPU by disabling the GIC CPU IF to prevent wfi
-	 * from completing execution behind power controller back
-	 */
-	gic_cpu_if_down(0);
-}
-
-static void tc2_pm_cluster_powerdown_prepare(unsigned int cluster)
-{
-	pr_debug("%s: cluster %u\n", __func__, cluster);
-	BUG_ON(cluster >= TC2_CLUSTERS);
-	ve_spc_powerdown(cluster, true);
-	ve_spc_global_wakeup_irq(true);
-}
-
-static void tc2_pm_cpu_cache_disable(void)
-{
-	v7_exit_coherency_flush(louis);
-}
-
-static void tc2_pm_cluster_cache_disable(void)
-{
-	if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A15) {
-		/*
-		 * On the Cortex-A15 we need to disable
-		 * L2 prefetching before flushing the cache.
-		 */
-		asm volatile(
-		"mcr	p15, 1, %0, c15, c0, 3 \n\t"
-		"isb	\n\t"
-		"dsb	"
-		: : "r" (0x400) );
-	}
-
-	v7_exit_coherency_flush(all);
-	cci_disable_port_by_cpu(read_cpuid_mpidr());
-}
-
-static int tc2_core_in_reset(unsigned int cpu, unsigned int cluster)
-{
-	u32 mask = cluster ?
-		  RESET_A7_NCORERESET(cpu)
-		: RESET_A15_NCORERESET(cpu);
-
-	return !(readl_relaxed(scc + RESET_CTRL) & mask);
-}
-
-#define POLL_MSEC 10
-#define TIMEOUT_MSEC 1000
-
-static int tc2_pm_wait_for_powerdown(unsigned int cpu, unsigned int cluster)
-{
-	unsigned tries;
-
-	pr_debug("%s: cpu %u cluster %u\n", __func__, cpu, cluster);
-	BUG_ON(cluster >= TC2_CLUSTERS || cpu >= TC2_MAX_CPUS_PER_CLUSTER);
-
-	for (tries = 0; tries < TIMEOUT_MSEC / POLL_MSEC; ++tries) {
-		pr_debug("%s(cpu=%u, cluster=%u): RESET_CTRL = 0x%08X\n",
-			 __func__, cpu, cluster,
-			 readl_relaxed(scc + RESET_CTRL));
-
-		/*
-		 * We need the CPU to reach WFI, but the power
-		 * controller may put the cluster in reset and
-		 * power it off as soon as that happens, before
-		 * we have a chance to see STANDBYWFI.
-		 *
-		 * So we need to check for both conditions:
-		 */
-		if (tc2_core_in_reset(cpu, cluster) ||
-		    ve_spc_cpu_in_wfi(cpu, cluster))
-			return 0; /* success: the CPU is halted */
-
-		/* Otherwise, wait and retry: */
-		msleep(POLL_MSEC);
-	}
-
-	return -ETIMEDOUT; /* timeout */
-}
-
-static void tc2_pm_cpu_suspend_prepare(unsigned int cpu, unsigned int cluster)
-{
-	ve_spc_set_resume_addr(cluster, cpu, __pa_symbol(mcpm_entry_point));
-}
-
-static void tc2_pm_cpu_is_up(unsigned int cpu, unsigned int cluster)
-{
-	pr_debug("%s: cpu %u cluster %u\n", __func__, cpu, cluster);
-	BUG_ON(cluster >= TC2_CLUSTERS || cpu >= TC2_MAX_CPUS_PER_CLUSTER);
-	ve_spc_cpu_wakeup_irq(cluster, cpu, false);
-	ve_spc_set_resume_addr(cluster, cpu, 0);
-}
-
-static void tc2_pm_cluster_is_up(unsigned int cluster)
-{
-	pr_debug("%s: cluster %u\n", __func__, cluster);
-	BUG_ON(cluster >= TC2_CLUSTERS);
-	ve_spc_powerdown(cluster, false);
-	ve_spc_global_wakeup_irq(false);
-}
-
-static const struct mcpm_platform_ops tc2_pm_power_ops = {
-	.cpu_powerup		= tc2_pm_cpu_powerup,
-	.cluster_powerup	= tc2_pm_cluster_powerup,
-	.cpu_suspend_prepare	= tc2_pm_cpu_suspend_prepare,
-	.cpu_powerdown_prepare	= tc2_pm_cpu_powerdown_prepare,
-	.cluster_powerdown_prepare = tc2_pm_cluster_powerdown_prepare,
-	.cpu_cache_disable	= tc2_pm_cpu_cache_disable,
-	.cluster_cache_disable	= tc2_pm_cluster_cache_disable,
-	.wait_for_powerdown	= tc2_pm_wait_for_powerdown,
-	.cpu_is_up		= tc2_pm_cpu_is_up,
-	.cluster_is_up		= tc2_pm_cluster_is_up,
-};
-
-/*
- * Enable cluster-level coherency, in preparation for turning on the MMU.
- */
-static void __naked tc2_pm_power_up_setup(unsigned int affinity_level)
-{
-	asm volatile (" \n"
-"	cmp	r0, #1 \n"
-"	bxne	lr \n"
-"	b	cci_enable_port_for_self ");
-}
-
-static int __init tc2_pm_init(void)
-{
-	unsigned int mpidr, cpu, cluster;
-	int ret, irq;
-	u32 a15_cluster_id, a7_cluster_id, sys_info;
-	struct device_node *np;
-
-	/*
-	 * The power management-related features are hidden behind
-	 * SCC registers. We need to extract runtime information like
-	 * cluster ids and number of CPUs really available in clusters.
-	 */
-	np = of_find_compatible_node(NULL, NULL,
-			"arm,vexpress-scc,v2p-ca15_a7");
-	scc = of_iomap(np, 0);
-	if (!scc)
-		return -ENODEV;
-
-	a15_cluster_id = readl_relaxed(scc + A15_CONF) & 0xf;
-	a7_cluster_id = readl_relaxed(scc + A7_CONF) & 0xf;
-	if (a15_cluster_id >= TC2_CLUSTERS || a7_cluster_id >= TC2_CLUSTERS)
-		return -EINVAL;
-
-	sys_info = readl_relaxed(scc + SYS_INFO);
-	tc2_nr_cpus[a15_cluster_id] = (sys_info >> 16) & 0xf;
-	tc2_nr_cpus[a7_cluster_id] = (sys_info >> 20) & 0xf;
-
-	irq = irq_of_parse_and_map(np, 0);
-
-	/*
-	 * A subset of the SCC registers is also used to communicate
-	 * with the SPC (power controller). We need to be able to
-	 * drive it very early in the boot process to power up
-	 * processors, so we initialize the SPC driver here.
-	 */
-	ret = ve_spc_init(scc + SPC_BASE, a15_cluster_id, irq);
-	if (ret)
-		return ret;
-
-	if (!cci_probed())
-		return -ENODEV;
-
-	mpidr = read_cpuid_mpidr();
-	cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
-	cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
-	pr_debug("%s: cpu %u cluster %u\n", __func__, cpu, cluster);
-	if (cluster >= TC2_CLUSTERS || cpu >= tc2_nr_cpus[cluster]) {
-		pr_err("%s: boot CPU is out of bound!\n", __func__);
-		return -EINVAL;
-	}
-
-	ret = mcpm_platform_register(&tc2_pm_power_ops);
-	if (!ret) {
-		mcpm_sync_init(tc2_pm_power_up_setup);
-		/* test if we can (re)enable the CCI on our own */
-		BUG_ON(mcpm_loopback(tc2_pm_cluster_cache_disable) != 0);
-		pr_info("TC2 power management initialized\n");
-	}
-	return ret;
-}
-
-early_initcall(tc2_pm_init);