diff options
Diffstat (limited to 'kernel/arch/arm/mach-omap2/omap-wakeupgen.c')
| -rw-r--r-- | kernel/arch/arm/mach-omap2/omap-wakeupgen.c | 544 |
1 files changed, 544 insertions, 0 deletions
diff --git a/kernel/arch/arm/mach-omap2/omap-wakeupgen.c b/kernel/arch/arm/mach-omap2/omap-wakeupgen.c new file mode 100644 index 000000000..3b56722df --- /dev/null +++ b/kernel/arch/arm/mach-omap2/omap-wakeupgen.c @@ -0,0 +1,544 @@ +/* + * 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> + * + * 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/kernel.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/irq.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 + +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; + +/* + * 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); +} + +#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); + +} + +/* + * 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) +{ + if (!sar_base) + sar_base = omap4_get_sar_ram_base(); + + if (soc_is_omap54xx()) + omap5_irq_save_context(); + else + omap4_irq_save_context(); +} + +/* + * Clear WakeupGen SAR backup status. + */ +static void irq_sar_clear(void) +{ + u32 val; + u32 offset = SAR_BACKUP_STATUS_OFFSET; + + 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); +} + +/* + * 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"); +} +#endif + +#ifdef CONFIG_HOTPLUG_CPU +static int irq_cpu_hotplug_notify(struct notifier_block *self, + unsigned long action, void *hcpu) +{ + unsigned int cpu = (unsigned int)hcpu; + + switch (action) { + case CPU_ONLINE: + wakeupgen_irqmask_all(cpu, 0); + break; + case CPU_DEAD: + wakeupgen_irqmask_all(cpu, 1); + break; + } + return NOTIFY_OK; +} + +static struct notifier_block __refdata irq_hotplug_notifier = { + .notifier_call = irq_cpu_hotplug_notify, +}; + +static void __init irq_hotplug_init(void) +{ + register_hotcpu_notifier(&irq_hotplug_notifier); +} +#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) + irq_save_context(); + else + irq_save_secure_context(); + break; + case CPU_CLUSTER_PM_EXIT: + if (omap_type() == OMAP2_DEVICE_TYPE_GP) + irq_sar_clear(); + 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, + .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_xlate(struct irq_domain *domain, + struct device_node *controller, + const u32 *intspec, + unsigned int intsize, + unsigned long *out_hwirq, + unsigned int *out_type) +{ + if (domain->of_node != controller) + return -EINVAL; /* Shouldn't happen, really... */ + if (intsize != 3) + return -EINVAL; /* Not GIC compliant */ + if (intspec[0] != 0) + return -EINVAL; /* No PPI should point to this domain */ + + *out_hwirq = intspec[1]; + *out_type = intspec[2]; + return 0; +} + +static int wakeupgen_domain_alloc(struct irq_domain *domain, + unsigned int virq, + unsigned int nr_irqs, void *data) +{ + struct of_phandle_args *args = data; + struct of_phandle_args parent_args; + irq_hw_number_t hwirq; + int i; + + if (args->args_count != 3) + return -EINVAL; /* Not GIC compliant */ + if (args->args[0] != 0) + return -EINVAL; /* No PPI should point to this domain */ + + hwirq = args->args[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_args = *args; + parent_args.np = domain->parent->of_node; + return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &parent_args); +} + +static struct irq_domain_ops wakeupgen_domain_ops = { + .xlate = wakeupgen_domain_xlate, + .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("%s: no parent, giving up\n", node->full_name); + return -ENODEV; + } + + parent_domain = irq_find_host(parent); + if (!parent_domain) { + pr_err("%s: unable to obtain parent domain\n", node->full_name); + 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; + } else if (soc_is_am43xx()) { + irq_banks = AM43XX_NR_REG_BANKS; + max_irqs = AM43XX_IRQS; + } + + 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(); + + return 0; +} + +/* + * We cannot use the IRQCHIP_DECLARE macro that lives in + * drivers/irqchip, so we're forced to roll our own. Not very nice. + */ +OF_DECLARE_2(irqchip, ti_wakeupgen, "ti,omap4-wugen-mpu", wakeupgen_init); |