diff options
Diffstat (limited to 'arch/arm/mach-ux500')
| -rw-r--r-- | arch/arm/mach-ux500/Kconfig | 48 | ||||
| -rw-r--r-- | arch/arm/mach-ux500/Makefile | 8 | ||||
| -rw-r--r-- | arch/arm/mach-ux500/cpu-db8500.c | 133 | ||||
| -rw-r--r-- | arch/arm/mach-ux500/platsmp.c | 100 | ||||
| -rw-r--r-- | arch/arm/mach-ux500/pm.c | 201 |
5 files changed, 490 insertions, 0 deletions
diff --git a/arch/arm/mach-ux500/Kconfig b/arch/arm/mach-ux500/Kconfig new file mode 100644 index 0000000000..c18def2691 --- /dev/null +++ b/arch/arm/mach-ux500/Kconfig @@ -0,0 +1,48 @@ +# SPDX-License-Identifier: GPL-2.0 +menuconfig ARCH_U8500 + bool "ST-Ericsson U8500 Series" + depends on ARCH_MULTI_V7 + select AB8500_CORE + select ABX500_CORE + select ARM_AMBA + select ARM_ERRATA_754322 + select ARM_ERRATA_764369 if SMP + select ARM_GIC + select CACHE_L2X0 + select CLKSRC_DBX500_PRCMU + select CLKSRC_NOMADIK_MTU + select GPIOLIB + select HAVE_ARM_SCU if SMP + select HAVE_ARM_TWD if SMP + select I2C + select I2C_NOMADIK + select MFD_DB8500_PRCMU + select PINCTRL + select PINCTRL_AB8500 + select PINCTRL_AB8505 + select PINCTRL_ABX500 + select PINCTRL_DB8500 + select PINCTRL_NOMADIK + select PL310_ERRATA_753970 if CACHE_L2X0 + select PM_GENERIC_DOMAINS if PM + select REGULATOR + select REGULATOR_DB8500_PRCMU + select REGULATOR_FIXED_VOLTAGE + select SOC_BUS + select RESET_CONTROLLER + help + Support for ST-Ericsson's Ux500 architecture + +if ARCH_U8500 + +config UX500_SOC_DB8500 + def_bool y + +config UX500_DEBUG_UART + int "Ux500 UART to use for low-level debug" + default 2 + help + Choose the UART on which kernel low-level debug messages should be + output. + +endif diff --git a/arch/arm/mach-ux500/Makefile b/arch/arm/mach-ux500/Makefile new file mode 100644 index 0000000000..270e5676fa --- /dev/null +++ b/arch/arm/mach-ux500/Makefile @@ -0,0 +1,8 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Makefile for the linux kernel, U8500 machine. +# + +obj-y := pm.o +obj-$(CONFIG_UX500_SOC_DB8500) += cpu-db8500.o +obj-$(CONFIG_SMP) += platsmp.o diff --git a/arch/arm/mach-ux500/cpu-db8500.c b/arch/arm/mach-ux500/cpu-db8500.c new file mode 100644 index 0000000000..b1a70f2033 --- /dev/null +++ b/arch/arm/mach-ux500/cpu-db8500.c @@ -0,0 +1,133 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2008-2009 ST-Ericsson SA + * + * Author: Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com> + */ +#include <linux/types.h> +#include <linux/init.h> +#include <linux/device.h> +#include <linux/amba/bus.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/irqchip.h> +#include <linux/irqchip/arm-gic.h> +#include <linux/mfd/dbx500-prcmu.h> +#include <linux/platform_data/arm-ux500-pm.h> +#include <linux/platform_device.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_platform.h> +#include <linux/regulator/machine.h> + +#include <asm/outercache.h> +#include <asm/hardware/cache-l2x0.h> +#include <asm/mach/map.h> +#include <asm/mach/arch.h> + +static int __init ux500_l2x0_unlock(void) +{ + int i; + struct device_node *np; + void __iomem *l2x0_base; + + np = of_find_compatible_node(NULL, NULL, "arm,pl310-cache"); + l2x0_base = of_iomap(np, 0); + of_node_put(np); + if (!l2x0_base) + return -ENODEV; + + /* + * Unlock Data and Instruction Lock if locked. Ux500 U-Boot versions + * apparently locks both caches before jumping to the kernel. The + * l2x0 core will not touch the unlock registers if the l2x0 is + * already enabled, so we do it right here instead. The PL310 has + * 8 sets of registers, one per possible CPU. + */ + for (i = 0; i < 8; i++) { + writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_D_BASE + + i * L2X0_LOCKDOWN_STRIDE); + writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_I_BASE + + i * L2X0_LOCKDOWN_STRIDE); + } + iounmap(l2x0_base); + return 0; +} + +static void ux500_l2c310_write_sec(unsigned long val, unsigned reg) +{ + /* + * We can't write to secure registers as we are in non-secure + * mode, until we have some SMI service available. + */ +} + +/* + * FIXME: Should we set up the GPIO domain here? + * + * The problem is that we cannot put the interrupt resources into the platform + * device until the irqdomain has been added. Right now, we set the GIC interrupt + * domain from init_irq(), then load the gpio driver from + * core_initcall(nmk_gpio_init) and add the platform devices from + * arch_initcall(customize_machine). + * + * This feels fragile because it depends on the gpio device getting probed + * _before_ any device uses the gpio interrupts. +*/ +static void __init ux500_init_irq(void) +{ + struct device_node *np; + struct resource r; + + irqchip_init(); + prcmu_early_init(); + np = of_find_compatible_node(NULL, NULL, "stericsson,db8500-prcmu"); + of_address_to_resource(np, 0, &r); + of_node_put(np); + if (!r.start) { + pr_err("could not find PRCMU base resource\n"); + return; + } + ux500_pm_init(r.start, r.end-r.start); + + /* Unlock before init */ + ux500_l2x0_unlock(); + outer_cache.write_sec = ux500_l2c310_write_sec; +} + +static void ux500_restart(enum reboot_mode mode, const char *cmd) +{ + local_irq_disable(); + local_fiq_disable(); + + prcmu_system_reset(0); +} + +static const struct of_device_id u8500_local_bus_nodes[] = { + /* only create devices below soc node */ + { .compatible = "stericsson,db8500", }, + { .compatible = "simple-bus"}, + { }, +}; + +static void __init u8500_init_machine(void) +{ + of_platform_populate(NULL, u8500_local_bus_nodes, + NULL, NULL); +} + +static const char * stericsson_dt_platform_compat[] = { + "st-ericsson,u8500", + "st-ericsson,u9500", + NULL, +}; + +DT_MACHINE_START(U8500_DT, "ST-Ericsson Ux5x0 platform (Device Tree Support)") + .l2c_aux_val = 0, + .l2c_aux_mask = ~0, + .init_irq = ux500_init_irq, + .init_machine = u8500_init_machine, + .dt_compat = stericsson_dt_platform_compat, + .restart = ux500_restart, +MACHINE_END diff --git a/arch/arm/mach-ux500/platsmp.c b/arch/arm/mach-ux500/platsmp.c new file mode 100644 index 0000000000..656b58bd29 --- /dev/null +++ b/arch/arm/mach-ux500/platsmp.c @@ -0,0 +1,100 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2002 ARM Ltd. + * Copyright (C) 2008 STMicroelctronics. + * Copyright (C) 2009 ST-Ericsson. + * Author: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com> + * + * This file is based on arm realview platform + */ +#include <linux/init.h> +#include <linux/errno.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/smp.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/of_address.h> + +#include <asm/cacheflush.h> +#include <asm/smp_plat.h> +#include <asm/smp_scu.h> + +/* Magic triggers in backup RAM */ +#define UX500_CPU1_JUMPADDR_OFFSET 0x1FF4 +#define UX500_CPU1_WAKEMAGIC_OFFSET 0x1FF0 + +static void __iomem *backupram; + +static void __init ux500_smp_prepare_cpus(unsigned int max_cpus) +{ + struct device_node *np; + static void __iomem *scu_base; + unsigned int ncores; + int i; + + np = of_find_compatible_node(NULL, NULL, "ste,dbx500-backupram"); + if (!np) { + pr_err("No backupram base address\n"); + return; + } + backupram = of_iomap(np, 0); + of_node_put(np); + if (!backupram) { + pr_err("No backupram remap\n"); + return; + } + + np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu"); + if (!np) { + pr_err("No SCU base address\n"); + return; + } + scu_base = of_iomap(np, 0); + of_node_put(np); + if (!scu_base) { + pr_err("No SCU remap\n"); + return; + } + + scu_enable(scu_base); + ncores = scu_get_core_count(scu_base); + for (i = 0; i < ncores; i++) + set_cpu_possible(i, true); + iounmap(scu_base); +} + +static int ux500_boot_secondary(unsigned int cpu, struct task_struct *idle) +{ + /* + * write the address of secondary startup into the backup ram register + * at offset 0x1FF4, then write the magic number 0xA1FEED01 to the + * backup ram register at offset 0x1FF0, which is what boot rom code + * is waiting for. This will wake up the secondary core from WFE. + */ + writel(__pa_symbol(secondary_startup), + backupram + UX500_CPU1_JUMPADDR_OFFSET); + writel(0xA1FEED01, + backupram + UX500_CPU1_WAKEMAGIC_OFFSET); + + /* make sure write buffer is drained */ + mb(); + arch_send_wakeup_ipi_mask(cpumask_of(cpu)); + return 0; +} + +#ifdef CONFIG_HOTPLUG_CPU +static void ux500_cpu_die(unsigned int cpu) +{ + wfi(); +} +#endif + +static const struct smp_operations ux500_smp_ops __initconst = { + .smp_prepare_cpus = ux500_smp_prepare_cpus, + .smp_boot_secondary = ux500_boot_secondary, +#ifdef CONFIG_HOTPLUG_CPU + .cpu_die = ux500_cpu_die, +#endif +}; +CPU_METHOD_OF_DECLARE(ux500_smp, "ste,dbx500-smp", &ux500_smp_ops); diff --git a/arch/arm/mach-ux500/pm.c b/arch/arm/mach-ux500/pm.c new file mode 100644 index 0000000000..dc962d006b --- /dev/null +++ b/arch/arm/mach-ux500/pm.c @@ -0,0 +1,201 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) ST-Ericsson SA 2010-2013 + * Author: Rickard Andersson <rickard.andersson@stericsson.com> for + * ST-Ericsson. + * Author: Daniel Lezcano <daniel.lezcano@linaro.org> for Linaro. + * Author: Ulf Hansson <ulf.hansson@linaro.org> for Linaro. + */ + +#include <linux/kernel.h> +#include <linux/irqchip/arm-gic.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/suspend.h> +#include <linux/platform_data/arm-ux500-pm.h> +#include <linux/of.h> +#include <linux/of_address.h> + +/* ARM WFI Standby signal register */ +#define PRCM_ARM_WFI_STANDBY (prcmu_base + 0x130) +#define PRCM_ARM_WFI_STANDBY_WFI0 0x08 +#define PRCM_ARM_WFI_STANDBY_WFI1 0x10 +#define PRCM_IOCR (prcmu_base + 0x310) +#define PRCM_IOCR_IOFORCE 0x1 + +/* Dual A9 core interrupt management unit registers */ +#define PRCM_A9_MASK_REQ (prcmu_base + 0x328) +#define PRCM_A9_MASK_REQ_PRCM_A9_MASK_REQ 0x1 + +#define PRCM_A9_MASK_ACK (prcmu_base + 0x32c) +#define PRCM_ARMITMSK31TO0 (prcmu_base + 0x11c) +#define PRCM_ARMITMSK63TO32 (prcmu_base + 0x120) +#define PRCM_ARMITMSK95TO64 (prcmu_base + 0x124) +#define PRCM_ARMITMSK127TO96 (prcmu_base + 0x128) +#define PRCM_POWER_STATE_VAL (prcmu_base + 0x25C) +#define PRCM_ARMITVAL31TO0 (prcmu_base + 0x260) +#define PRCM_ARMITVAL63TO32 (prcmu_base + 0x264) +#define PRCM_ARMITVAL95TO64 (prcmu_base + 0x268) +#define PRCM_ARMITVAL127TO96 (prcmu_base + 0x26C) + +static void __iomem *prcmu_base; +static void __iomem *dist_base; + +/* This function decouple the gic from the prcmu */ +int prcmu_gic_decouple(void) +{ + u32 val = readl(PRCM_A9_MASK_REQ); + + /* Set bit 0 register value to 1 */ + writel(val | PRCM_A9_MASK_REQ_PRCM_A9_MASK_REQ, + PRCM_A9_MASK_REQ); + + /* Make sure the register is updated */ + readl(PRCM_A9_MASK_REQ); + + /* Wait a few cycles for the gic mask completion */ + udelay(1); + + return 0; +} + +/* This function recouple the gic with the prcmu */ +int prcmu_gic_recouple(void) +{ + u32 val = readl(PRCM_A9_MASK_REQ); + + /* Set bit 0 register value to 0 */ + writel(val & ~PRCM_A9_MASK_REQ_PRCM_A9_MASK_REQ, PRCM_A9_MASK_REQ); + + return 0; +} + +#define PRCMU_GIC_NUMBER_REGS 5 + +/* + * This function checks if there are pending irq on the gic. It only + * makes sense if the gic has been decoupled before with the + * db8500_prcmu_gic_decouple function. Disabling an interrupt only + * disables the forwarding of the interrupt to any CPU interface. It + * does not prevent the interrupt from changing state, for example + * becoming pending, or active and pending if it is already + * active. Hence, we have to check the interrupt is pending *and* is + * active. + */ +bool prcmu_gic_pending_irq(void) +{ + u32 pr; /* Pending register */ + u32 er; /* Enable register */ + int i; + + /* 5 registers. STI & PPI not skipped */ + for (i = 0; i < PRCMU_GIC_NUMBER_REGS; i++) { + + pr = readl_relaxed(dist_base + GIC_DIST_PENDING_SET + i * 4); + er = readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4); + + if (pr & er) + return true; /* There is a pending interrupt */ + } + + return false; +} + +/* + * This function checks if there are pending interrupt on the + * prcmu which has been delegated to monitor the irqs with the + * db8500_prcmu_copy_gic_settings function. + */ +bool prcmu_pending_irq(void) +{ + u32 it, im; + int i; + + for (i = 0; i < PRCMU_GIC_NUMBER_REGS - 1; i++) { + it = readl(PRCM_ARMITVAL31TO0 + i * 4); + im = readl(PRCM_ARMITMSK31TO0 + i * 4); + if (it & im) + return true; /* There is a pending interrupt */ + } + + return false; +} + +/* + * This function checks if the specified cpu is in WFI. It's usage + * makes sense only if the gic is decoupled with the db8500_prcmu_gic_decouple + * function. Of course passing smp_processor_id() to this function will + * always return false... + */ +bool prcmu_is_cpu_in_wfi(int cpu) +{ + return readl(PRCM_ARM_WFI_STANDBY) & + (cpu ? PRCM_ARM_WFI_STANDBY_WFI1 : PRCM_ARM_WFI_STANDBY_WFI0); +} + +/* + * This function copies the gic SPI settings to the prcmu in order to + * monitor them and abort/finish the retention/off sequence or state. + */ +int prcmu_copy_gic_settings(void) +{ + u32 er; /* Enable register */ + int i; + + /* We skip the STI and PPI */ + for (i = 0; i < PRCMU_GIC_NUMBER_REGS - 1; i++) { + er = readl_relaxed(dist_base + + GIC_DIST_ENABLE_SET + (i + 1) * 4); + writel(er, PRCM_ARMITMSK31TO0 + i * 4); + } + + return 0; +} + +#ifdef CONFIG_SUSPEND +static int ux500_suspend_enter(suspend_state_t state) +{ + cpu_do_idle(); + return 0; +} + +static int ux500_suspend_valid(suspend_state_t state) +{ + return state == PM_SUSPEND_MEM || state == PM_SUSPEND_STANDBY; +} + +static const struct platform_suspend_ops ux500_suspend_ops = { + .enter = ux500_suspend_enter, + .valid = ux500_suspend_valid, +}; +#define UX500_SUSPEND_OPS (&ux500_suspend_ops) +#else +#define UX500_SUSPEND_OPS NULL +#endif + +void __init ux500_pm_init(u32 phy_base, u32 size) +{ + struct device_node *np; + + prcmu_base = ioremap(phy_base, size); + if (!prcmu_base) { + pr_err("could not remap PRCMU for PM functions\n"); + return; + } + np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-gic"); + dist_base = of_iomap(np, 0); + of_node_put(np); + if (!dist_base) { + pr_err("could not remap GIC dist base for PM functions\n"); + return; + } + + /* + * On watchdog reboot the GIC is in some cases decoupled. + * This will make sure that the GIC is correctly configured. + */ + prcmu_gic_recouple(); + + /* Set up ux500 suspend callbacks. */ + suspend_set_ops(UX500_SUSPEND_OPS); +} |