Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 635 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/omap-wakeupgen.c b/arch/arm/mach-omap2/omap-wakeupgen.c
new file mode 100644
index 0000000000..6f0d6120c1
--- /dev/null
+++ b/arch/arm/mach-omap2/omap-wakeupgen.c
@@ -0,0 +1,635 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * OMAP WakeupGen Source file
+ *
+ * OMAP WakeupGen is the interrupt controller extension used along
+ * with ARM GIC to wake the CPU out from low power states on
+ * external interrupts. It is responsible for generating wakeup
+ * event from the incoming interrupts and enable bits. It is
+ * implemented in MPU always ON power domain. During normal operation,
+ * WakeupGen delivers external interrupts directly to the GIC.
+ *
+ * Copyright (C) 2011 Texas Instruments, Inc.
+ *	Santosh Shilimkar <santosh.shilimkar@ti.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/irqchip.h>
+#include <linux/irqdomain.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/cpu.h>
+#include <linux/notifier.h>
+#include <linux/cpu_pm.h>
+
+#include "omap-wakeupgen.h"
+#include "omap-secure.h"
+
+#include "soc.h"
+#include "omap4-sar-layout.h"
+#include "common.h"
+#include "pm.h"
+
+#define AM43XX_NR_REG_BANKS	7
+#define AM43XX_IRQS		224
+#define MAX_NR_REG_BANKS	AM43XX_NR_REG_BANKS
+#define MAX_IRQS		AM43XX_IRQS
+#define DEFAULT_NR_REG_BANKS	5
+#define DEFAULT_IRQS		160
+#define WKG_MASK_ALL		0x00000000
+#define WKG_UNMASK_ALL		0xffffffff
+#define CPU_ENA_OFFSET		0x400
+#define CPU0_ID			0x0
+#define CPU1_ID			0x1
+#define OMAP4_NR_BANKS		4
+#define OMAP4_NR_IRQS		128
+
+#define SYS_NIRQ1_EXT_SYS_IRQ_1	7
+#define SYS_NIRQ2_EXT_SYS_IRQ_2	119
+
+static void __iomem *wakeupgen_base;
+static void __iomem *sar_base;
+static DEFINE_RAW_SPINLOCK(wakeupgen_lock);
+static unsigned int irq_target_cpu[MAX_IRQS];
+static unsigned int irq_banks = DEFAULT_NR_REG_BANKS;
+static unsigned int max_irqs = DEFAULT_IRQS;
+static unsigned int omap_secure_apis;
+
+#ifdef CONFIG_CPU_PM
+static unsigned int wakeupgen_context[MAX_NR_REG_BANKS];
+#endif
+
+struct omap_wakeupgen_ops {
+	void (*save_context)(void);
+	void (*restore_context)(void);
+};
+
+static struct omap_wakeupgen_ops *wakeupgen_ops;
+
+/*
+ * Static helper functions.
+ */
+static inline u32 wakeupgen_readl(u8 idx, u32 cpu)
+{
+	return readl_relaxed(wakeupgen_base + OMAP_WKG_ENB_A_0 +
+				(cpu * CPU_ENA_OFFSET) + (idx * 4));
+}
+
+static inline void wakeupgen_writel(u32 val, u8 idx, u32 cpu)
+{
+	writel_relaxed(val, wakeupgen_base + OMAP_WKG_ENB_A_0 +
+				(cpu * CPU_ENA_OFFSET) + (idx * 4));
+}
+
+static inline void sar_writel(u32 val, u32 offset, u8 idx)
+{
+	writel_relaxed(val, sar_base + offset + (idx * 4));
+}
+
+static inline int _wakeupgen_get_irq_info(u32 irq, u32 *bit_posn, u8 *reg_index)
+{
+	/*
+	 * Each WakeupGen register controls 32 interrupt.
+	 * i.e. 1 bit per SPI IRQ
+	 */
+	*reg_index = irq >> 5;
+	*bit_posn = irq %= 32;
+
+	return 0;
+}
+
+static void _wakeupgen_clear(unsigned int irq, unsigned int cpu)
+{
+	u32 val, bit_number;
+	u8 i;
+
+	if (_wakeupgen_get_irq_info(irq, &bit_number, &i))
+		return;
+
+	val = wakeupgen_readl(i, cpu);
+	val &= ~BIT(bit_number);
+	wakeupgen_writel(val, i, cpu);
+}
+
+static void _wakeupgen_set(unsigned int irq, unsigned int cpu)
+{
+	u32 val, bit_number;
+	u8 i;
+
+	if (_wakeupgen_get_irq_info(irq, &bit_number, &i))
+		return;
+
+	val = wakeupgen_readl(i, cpu);
+	val |= BIT(bit_number);
+	wakeupgen_writel(val, i, cpu);
+}
+
+/*
+ * Architecture specific Mask extension
+ */
+static void wakeupgen_mask(struct irq_data *d)
+{
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&wakeupgen_lock, flags);
+	_wakeupgen_clear(d->hwirq, irq_target_cpu[d->hwirq]);
+	raw_spin_unlock_irqrestore(&wakeupgen_lock, flags);
+	irq_chip_mask_parent(d);
+}
+
+/*
+ * Architecture specific Unmask extension
+ */
+static void wakeupgen_unmask(struct irq_data *d)
+{
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&wakeupgen_lock, flags);
+	_wakeupgen_set(d->hwirq, irq_target_cpu[d->hwirq]);
+	raw_spin_unlock_irqrestore(&wakeupgen_lock, flags);
+	irq_chip_unmask_parent(d);
+}
+
+/*
+ * The sys_nirq pins bypass peripheral modules and are wired directly
+ * to MPUSS wakeupgen. They get automatically inverted for GIC.
+ */
+static int wakeupgen_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	bool inverted = false;
+
+	switch (type) {
+	case IRQ_TYPE_LEVEL_LOW:
+		type &= ~IRQ_TYPE_LEVEL_MASK;
+		type |= IRQ_TYPE_LEVEL_HIGH;
+		inverted = true;
+		break;
+	case IRQ_TYPE_EDGE_FALLING:
+		type &= ~IRQ_TYPE_EDGE_BOTH;
+		type |= IRQ_TYPE_EDGE_RISING;
+		inverted = true;
+		break;
+	default:
+		break;
+	}
+
+	if (inverted && d->hwirq != SYS_NIRQ1_EXT_SYS_IRQ_1 &&
+	    d->hwirq != SYS_NIRQ2_EXT_SYS_IRQ_2)
+		pr_warn("wakeupgen: irq%li polarity inverted in dts\n",
+			d->hwirq);
+
+	return irq_chip_set_type_parent(d, type);
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+static DEFINE_PER_CPU(u32 [MAX_NR_REG_BANKS], irqmasks);
+
+static void _wakeupgen_save_masks(unsigned int cpu)
+{
+	u8 i;
+
+	for (i = 0; i < irq_banks; i++)
+		per_cpu(irqmasks, cpu)[i] = wakeupgen_readl(i, cpu);
+}
+
+static void _wakeupgen_restore_masks(unsigned int cpu)
+{
+	u8 i;
+
+	for (i = 0; i < irq_banks; i++)
+		wakeupgen_writel(per_cpu(irqmasks, cpu)[i], i, cpu);
+}
+
+static void _wakeupgen_set_all(unsigned int cpu, unsigned int reg)
+{
+	u8 i;
+
+	for (i = 0; i < irq_banks; i++)
+		wakeupgen_writel(reg, i, cpu);
+}
+
+/*
+ * Mask or unmask all interrupts on given CPU.
+ *	0 = Mask all interrupts on the 'cpu'
+ *	1 = Unmask all interrupts on the 'cpu'
+ * Ensure that the initial mask is maintained. This is faster than
+ * iterating through GIC registers to arrive at the correct masks.
+ */
+static void wakeupgen_irqmask_all(unsigned int cpu, unsigned int set)
+{
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&wakeupgen_lock, flags);
+	if (set) {
+		_wakeupgen_save_masks(cpu);
+		_wakeupgen_set_all(cpu, WKG_MASK_ALL);
+	} else {
+		_wakeupgen_set_all(cpu, WKG_UNMASK_ALL);
+		_wakeupgen_restore_masks(cpu);
+	}
+	raw_spin_unlock_irqrestore(&wakeupgen_lock, flags);
+}
+#endif
+
+#ifdef CONFIG_CPU_PM
+static inline void omap4_irq_save_context(void)
+{
+	u32 i, val;
+
+	if (omap_rev() == OMAP4430_REV_ES1_0)
+		return;
+
+	for (i = 0; i < irq_banks; i++) {
+		/* Save the CPUx interrupt mask for IRQ 0 to 127 */
+		val = wakeupgen_readl(i, 0);
+		sar_writel(val, WAKEUPGENENB_OFFSET_CPU0, i);
+		val = wakeupgen_readl(i, 1);
+		sar_writel(val, WAKEUPGENENB_OFFSET_CPU1, i);
+
+		/*
+		 * Disable the secure interrupts for CPUx. The restore
+		 * code blindly restores secure and non-secure interrupt
+		 * masks from SAR RAM. Secure interrupts are not suppose
+		 * to be enabled from HLOS. So overwrite the SAR location
+		 * so that the secure interrupt remains disabled.
+		 */
+		sar_writel(0x0, WAKEUPGENENB_SECURE_OFFSET_CPU0, i);
+		sar_writel(0x0, WAKEUPGENENB_SECURE_OFFSET_CPU1, i);
+	}
+
+	/* Save AuxBoot* registers */
+	val = readl_relaxed(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
+	writel_relaxed(val, sar_base + AUXCOREBOOT0_OFFSET);
+	val = readl_relaxed(wakeupgen_base + OMAP_AUX_CORE_BOOT_1);
+	writel_relaxed(val, sar_base + AUXCOREBOOT1_OFFSET);
+
+	/* Save SyncReq generation logic */
+	val = readl_relaxed(wakeupgen_base + OMAP_PTMSYNCREQ_MASK);
+	writel_relaxed(val, sar_base + PTMSYNCREQ_MASK_OFFSET);
+	val = readl_relaxed(wakeupgen_base + OMAP_PTMSYNCREQ_EN);
+	writel_relaxed(val, sar_base + PTMSYNCREQ_EN_OFFSET);
+
+	/* Set the Backup Bit Mask status */
+	val = readl_relaxed(sar_base + SAR_BACKUP_STATUS_OFFSET);
+	val |= SAR_BACKUP_STATUS_WAKEUPGEN;
+	writel_relaxed(val, sar_base + SAR_BACKUP_STATUS_OFFSET);
+
+}
+
+static inline void omap5_irq_save_context(void)
+{
+	u32 i, val;
+
+	for (i = 0; i < irq_banks; i++) {
+		/* Save the CPUx interrupt mask for IRQ 0 to 159 */
+		val = wakeupgen_readl(i, 0);
+		sar_writel(val, OMAP5_WAKEUPGENENB_OFFSET_CPU0, i);
+		val = wakeupgen_readl(i, 1);
+		sar_writel(val, OMAP5_WAKEUPGENENB_OFFSET_CPU1, i);
+		sar_writel(0x0, OMAP5_WAKEUPGENENB_SECURE_OFFSET_CPU0, i);
+		sar_writel(0x0, OMAP5_WAKEUPGENENB_SECURE_OFFSET_CPU1, i);
+	}
+
+	/* Save AuxBoot* registers */
+	val = readl_relaxed(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
+	writel_relaxed(val, sar_base + OMAP5_AUXCOREBOOT0_OFFSET);
+	val = readl_relaxed(wakeupgen_base + OMAP_AUX_CORE_BOOT_0);
+	writel_relaxed(val, sar_base + OMAP5_AUXCOREBOOT1_OFFSET);
+
+	/* Set the Backup Bit Mask status */
+	val = readl_relaxed(sar_base + OMAP5_SAR_BACKUP_STATUS_OFFSET);
+	val |= SAR_BACKUP_STATUS_WAKEUPGEN;
+	writel_relaxed(val, sar_base + OMAP5_SAR_BACKUP_STATUS_OFFSET);
+
+}
+
+static inline void am43xx_irq_save_context(void)
+{
+	u32 i;
+
+	for (i = 0; i < irq_banks; i++) {
+		wakeupgen_context[i] = wakeupgen_readl(i, 0);
+		wakeupgen_writel(0, i, CPU0_ID);
+	}
+}
+
+/*
+ * Save WakeupGen interrupt context in SAR BANK3. Restore is done by
+ * ROM code. WakeupGen IP is integrated along with GIC to manage the
+ * interrupt wakeups from CPU low power states. It manages
+ * masking/unmasking of Shared peripheral interrupts(SPI). So the
+ * interrupt enable/disable control should be in sync and consistent
+ * at WakeupGen and GIC so that interrupts are not lost.
+ */
+static void irq_save_context(void)
+{
+	/* DRA7 has no SAR to save */
+	if (soc_is_dra7xx())
+		return;
+
+	if (wakeupgen_ops && wakeupgen_ops->save_context)
+		wakeupgen_ops->save_context();
+}
+
+/*
+ * Clear WakeupGen SAR backup status.
+ */
+static void irq_sar_clear(void)
+{
+	u32 val;
+	u32 offset = SAR_BACKUP_STATUS_OFFSET;
+	/* DRA7 has no SAR to save */
+	if (soc_is_dra7xx())
+		return;
+
+	if (soc_is_omap54xx())
+		offset = OMAP5_SAR_BACKUP_STATUS_OFFSET;
+
+	val = readl_relaxed(sar_base + offset);
+	val &= ~SAR_BACKUP_STATUS_WAKEUPGEN;
+	writel_relaxed(val, sar_base + offset);
+}
+
+static void am43xx_irq_restore_context(void)
+{
+	u32 i;
+
+	for (i = 0; i < irq_banks; i++)
+		wakeupgen_writel(wakeupgen_context[i], i, CPU0_ID);
+}
+
+static void irq_restore_context(void)
+{
+	if (wakeupgen_ops && wakeupgen_ops->restore_context)
+		wakeupgen_ops->restore_context();
+}
+
+/*
+ * Save GIC and Wakeupgen interrupt context using secure API
+ * for HS/EMU devices.
+ */
+static void irq_save_secure_context(void)
+{
+	u32 ret;
+
+	ret = omap_secure_dispatcher(OMAP4_HAL_SAVEGIC_INDEX,
+				FLAG_START_CRITICAL,
+				0, 0, 0, 0, 0);
+	if (ret != API_HAL_RET_VALUE_OK)
+		pr_err("GIC and Wakeupgen context save failed\n");
+}
+
+/* Define ops for context save and restore for each SoC */
+static struct omap_wakeupgen_ops omap4_wakeupgen_ops = {
+	.save_context = omap4_irq_save_context,
+	.restore_context = irq_sar_clear,
+};
+
+static struct omap_wakeupgen_ops omap5_wakeupgen_ops = {
+	.save_context = omap5_irq_save_context,
+	.restore_context = irq_sar_clear,
+};
+
+static struct omap_wakeupgen_ops am43xx_wakeupgen_ops = {
+	.save_context = am43xx_irq_save_context,
+	.restore_context = am43xx_irq_restore_context,
+};
+#else
+static struct omap_wakeupgen_ops omap4_wakeupgen_ops = {};
+static struct omap_wakeupgen_ops omap5_wakeupgen_ops = {};
+static struct omap_wakeupgen_ops am43xx_wakeupgen_ops = {};
+#endif
+
+#ifdef CONFIG_HOTPLUG_CPU
+static int omap_wakeupgen_cpu_online(unsigned int cpu)
+{
+	wakeupgen_irqmask_all(cpu, 0);
+	return 0;
+}
+
+static int omap_wakeupgen_cpu_dead(unsigned int cpu)
+{
+	wakeupgen_irqmask_all(cpu, 1);
+	return 0;
+}
+
+static void __init irq_hotplug_init(void)
+{
+	cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "arm/omap-wake:online",
+				  omap_wakeupgen_cpu_online, NULL);
+	cpuhp_setup_state_nocalls(CPUHP_ARM_OMAP_WAKE_DEAD,
+				  "arm/omap-wake:dead", NULL,
+				  omap_wakeupgen_cpu_dead);
+}
+#else
+static void __init irq_hotplug_init(void)
+{}
+#endif
+
+#ifdef CONFIG_CPU_PM
+static int irq_notifier(struct notifier_block *self, unsigned long cmd,	void *v)
+{
+	switch (cmd) {
+	case CPU_CLUSTER_PM_ENTER:
+		if (omap_type() == OMAP2_DEVICE_TYPE_GP || soc_is_am43xx())
+			irq_save_context();
+		else
+			irq_save_secure_context();
+		break;
+	case CPU_CLUSTER_PM_EXIT:
+		if (omap_type() == OMAP2_DEVICE_TYPE_GP || soc_is_am43xx())
+			irq_restore_context();
+		break;
+	}
+	return NOTIFY_OK;
+}
+
+static struct notifier_block irq_notifier_block = {
+	.notifier_call = irq_notifier,
+};
+
+static void __init irq_pm_init(void)
+{
+	/* FIXME: Remove this when MPU OSWR support is added */
+	if (!IS_PM44XX_ERRATUM(PM_OMAP4_CPU_OSWR_DISABLE))
+		cpu_pm_register_notifier(&irq_notifier_block);
+}
+#else
+static void __init irq_pm_init(void)
+{}
+#endif
+
+void __iomem *omap_get_wakeupgen_base(void)
+{
+	return wakeupgen_base;
+}
+
+int omap_secure_apis_support(void)
+{
+	return omap_secure_apis;
+}
+
+static struct irq_chip wakeupgen_chip = {
+	.name			= "WUGEN",
+	.irq_eoi		= irq_chip_eoi_parent,
+	.irq_mask		= wakeupgen_mask,
+	.irq_unmask		= wakeupgen_unmask,
+	.irq_retrigger		= irq_chip_retrigger_hierarchy,
+	.irq_set_type		= wakeupgen_irq_set_type,
+	.flags			= IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND,
+#ifdef CONFIG_SMP
+	.irq_set_affinity	= irq_chip_set_affinity_parent,
+#endif
+};
+
+static int wakeupgen_domain_translate(struct irq_domain *d,
+				      struct irq_fwspec *fwspec,
+				      unsigned long *hwirq,
+				      unsigned int *type)
+{
+	if (is_of_node(fwspec->fwnode)) {
+		if (fwspec->param_count != 3)
+			return -EINVAL;
+
+		/* No PPI should point to this domain */
+		if (fwspec->param[0] != 0)
+			return -EINVAL;
+
+		*hwirq = fwspec->param[1];
+		*type = fwspec->param[2];
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+static int wakeupgen_domain_alloc(struct irq_domain *domain,
+				  unsigned int virq,
+				  unsigned int nr_irqs, void *data)
+{
+	struct irq_fwspec *fwspec = data;
+	struct irq_fwspec parent_fwspec;
+	irq_hw_number_t hwirq;
+	int i;
+
+	if (fwspec->param_count != 3)
+		return -EINVAL;	/* Not GIC compliant */
+	if (fwspec->param[0] != 0)
+		return -EINVAL;	/* No PPI should point to this domain */
+
+	hwirq = fwspec->param[1];
+	if (hwirq >= MAX_IRQS)
+		return -EINVAL;	/* Can't deal with this */
+
+	for (i = 0; i < nr_irqs; i++)
+		irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
+					      &wakeupgen_chip, NULL);
+
+	parent_fwspec = *fwspec;
+	parent_fwspec.fwnode = domain->parent->fwnode;
+	return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
+					    &parent_fwspec);
+}
+
+static const struct irq_domain_ops wakeupgen_domain_ops = {
+	.translate	= wakeupgen_domain_translate,
+	.alloc		= wakeupgen_domain_alloc,
+	.free		= irq_domain_free_irqs_common,
+};
+
+/*
+ * Initialise the wakeupgen module.
+ */
+static int __init wakeupgen_init(struct device_node *node,
+				 struct device_node *parent)
+{
+	struct irq_domain *parent_domain, *domain;
+	int i;
+	unsigned int boot_cpu = smp_processor_id();
+	u32 val;
+
+	if (!parent) {
+		pr_err("%pOF: no parent, giving up\n", node);
+		return -ENODEV;
+	}
+
+	parent_domain = irq_find_host(parent);
+	if (!parent_domain) {
+		pr_err("%pOF: unable to obtain parent domain\n", node);
+		return -ENXIO;
+	}
+	/* Not supported on OMAP4 ES1.0 silicon */
+	if (omap_rev() == OMAP4430_REV_ES1_0) {
+		WARN(1, "WakeupGen: Not supported on OMAP4430 ES1.0\n");
+		return -EPERM;
+	}
+
+	/* Static mapping, never released */
+	wakeupgen_base = of_iomap(node, 0);
+	if (WARN_ON(!wakeupgen_base))
+		return -ENOMEM;
+
+	if (cpu_is_omap44xx()) {
+		irq_banks = OMAP4_NR_BANKS;
+		max_irqs = OMAP4_NR_IRQS;
+		omap_secure_apis = 1;
+		wakeupgen_ops = &omap4_wakeupgen_ops;
+	} else if (soc_is_omap54xx()) {
+		wakeupgen_ops = &omap5_wakeupgen_ops;
+	} else if (soc_is_am43xx()) {
+		irq_banks = AM43XX_NR_REG_BANKS;
+		max_irqs = AM43XX_IRQS;
+		wakeupgen_ops = &am43xx_wakeupgen_ops;
+	}
+
+	domain = irq_domain_add_hierarchy(parent_domain, 0, max_irqs,
+					  node, &wakeupgen_domain_ops,
+					  NULL);
+	if (!domain) {
+		iounmap(wakeupgen_base);
+		return -ENOMEM;
+	}
+
+	/* Clear all IRQ bitmasks at wakeupGen level */
+	for (i = 0; i < irq_banks; i++) {
+		wakeupgen_writel(0, i, CPU0_ID);
+		if (!soc_is_am43xx())
+			wakeupgen_writel(0, i, CPU1_ID);
+	}
+
+	/*
+	 * FIXME: Add support to set_smp_affinity() once the core
+	 * GIC code has necessary hooks in place.
+	 */
+
+	/* Associate all the IRQs to boot CPU like GIC init does. */
+	for (i = 0; i < max_irqs; i++)
+		irq_target_cpu[i] = boot_cpu;
+
+	/*
+	 * Enables OMAP5 ES2 PM Mode using ES2_PM_MODE in AMBA_IF_MODE
+	 * 0x0:	ES1 behavior, CPU cores would enter and exit OFF mode together.
+	 * 0x1:	ES2 behavior, CPU cores are allowed to enter/exit OFF mode
+	 * independently.
+	 * This needs to be set one time thanks to always ON domain.
+	 *
+	 * We do not support ES1 behavior anymore. OMAP5 is assumed to be
+	 * ES2.0, and the same is applicable for DRA7.
+	 */
+	if (soc_is_omap54xx() || soc_is_dra7xx()) {
+		val = __raw_readl(wakeupgen_base + OMAP_AMBA_IF_MODE);
+		val |= BIT(5);
+		omap_smc1(OMAP5_MON_AMBA_IF_INDEX, val);
+	}
+
+	irq_hotplug_init();
+	irq_pm_init();
+
+	sar_base = omap4_get_sar_ram_base();
+
+	return 0;
+}
+IRQCHIP_DECLARE(ti_wakeupgen, "ti,omap4-wugen-mpu", wakeupgen_init);