Currently, only the CPU_ON function is supported.
Signed-off-by: Masahiro Yamada yamada.masahiro@socionext.com ---
arch/arm/mach-uniphier/Kconfig | 2 + arch/arm/mach-uniphier/arm32/Makefile | 1 + arch/arm/mach-uniphier/arm32/arm-mpcore.h | 3 + arch/arm/mach-uniphier/arm32/psci.c | 153 ++++++++++++++++++++++++++++++ arch/arm/mach-uniphier/arm32/psci_smp.S | 40 ++++++++ arch/arm/mach-uniphier/debug.h | 68 +++++++++++++ arch/arm/mach-uniphier/sbc/sbc-regs.h | 1 - include/configs/uniphier.h | 3 + 8 files changed, 270 insertions(+), 1 deletion(-) create mode 100644 arch/arm/mach-uniphier/arm32/psci.c create mode 100644 arch/arm/mach-uniphier/arm32/psci_smp.S create mode 100644 arch/arm/mach-uniphier/debug.h
diff --git a/arch/arm/mach-uniphier/Kconfig b/arch/arm/mach-uniphier/Kconfig index a558073..a8a0b90 100644 --- a/arch/arm/mach-uniphier/Kconfig +++ b/arch/arm/mach-uniphier/Kconfig @@ -6,6 +6,8 @@ config SYS_CONFIG_NAME config ARCH_UNIPHIER_32BIT bool select CPU_V7 + select CPU_V7_HAS_NONSEC + select ARMV7_NONSEC
config ARCH_UNIPHIER_64BIT bool diff --git a/arch/arm/mach-uniphier/arm32/Makefile b/arch/arm/mach-uniphier/arm32/Makefile index 5074ebd..6f05d72 100644 --- a/arch/arm/mach-uniphier/arm32/Makefile +++ b/arch/arm/mach-uniphier/arm32/Makefile @@ -8,6 +8,7 @@ obj-$(CONFIG_DEBUG_LL) += debug_ll.o else obj-y += late_lowlevel_init.o obj-y += cache-uniphier.o +obj-$(CONFIG_ARMV7_PSCI) += psci.o psci_smp.o endif
obj-y += timer.o diff --git a/arch/arm/mach-uniphier/arm32/arm-mpcore.h b/arch/arm/mach-uniphier/arm32/arm-mpcore.h index cf7cd46..1a85664 100644 --- a/arch/arm/mach-uniphier/arm32/arm-mpcore.h +++ b/arch/arm/mach-uniphier/arm32/arm-mpcore.h @@ -12,6 +12,9 @@
/* SCU Control Register */ #define SCU_CTRL 0x00 +#define SCU_ENABLE (1 << 0) +#define SCU_STANDBY_ENABLE (1 << 5) + /* SCU Configuration Register */ #define SCU_CONF 0x04 /* SCU CPU Power Status Register */ diff --git a/arch/arm/mach-uniphier/arm32/psci.c b/arch/arm/mach-uniphier/arm32/psci.c new file mode 100644 index 0000000..633a3e0 --- /dev/null +++ b/arch/arm/mach-uniphier/arm32/psci.c @@ -0,0 +1,153 @@ +/* + * Copyright (C) 2016 Socionext Inc. + * Author: Masahiro Yamada yamada.masahiro@socionext.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <linux/bitops.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/psci.h> +#include <linux/sizes.h> +#include <asm/processor.h> +#include <asm/psci.h> +#include <asm/secure.h> + +#include "../debug.h" +#include "../soc-info.h" +#include "arm-mpcore.h" +#include "cache-uniphier.h" + +#define UNIPHIER_SMPCTRL_ROM_RSV2 0x59801208 + +void uniphier_smp_trampoline(void); +void uniphier_smp_trampoline_end(void); +u32 uniphier_smp_booted[CONFIG_ARMV7_PSCI_NR_CPUS]; + +static int uniphier_get_nr_cpus(void) +{ + switch (uniphier_get_soc_type()) { + case SOC_UNIPHIER_SLD3: + case SOC_UNIPHIER_PRO4: + case SOC_UNIPHIER_PRO5: + return 2; + case SOC_UNIPHIER_PXS2: + case SOC_UNIPHIER_LD6B: + return 4; + default: + return 1; + } +} + +static void uniphier_smp_kick_all_cpus(void) +{ + const u32 target_ways = BIT(0); + size_t trmp_size; + u32 trmp_src = (unsigned long)uniphier_smp_trampoline; + u32 trmp_src_end = (unsigned long)uniphier_smp_trampoline_end; + u32 trmp_dest, trmp_dest_end; + int nr_cpus, i; + int timeout = 1000; + + nr_cpus = uniphier_get_nr_cpus(); + if (nr_cpus == 1) + return; + + for (i = 0; i < nr_cpus; i++) /* lock ways for all CPUs */ + uniphier_cache_set_active_ways(i, 0); + uniphier_cache_inv_way(target_ways); + uniphier_cache_enable(); + + /* copy trampoline code */ + uniphier_cache_prefetch_range(trmp_src, trmp_src_end, target_ways); + + trmp_size = trmp_src_end - trmp_src; + + trmp_dest = trmp_src & (SZ_64K - 1); + trmp_dest += SZ_1M - SZ_64K * 2; + + trmp_dest_end = trmp_dest + trmp_size; + + uniphier_cache_touch_range(trmp_dest, trmp_dest_end, target_ways); + + writel(trmp_dest, UNIPHIER_SMPCTRL_ROM_RSV2); + + asm("dsb ishst\n" /* Ensure the write to ROM_RSV2 is visible */ + "sev"); /* Bring up all secondary CPUs from Boot ROM into U-Boot */ + + while (--timeout) { + int all_booted = 1; + + for (i = 1; i < nr_cpus; i++) + if (!uniphier_smp_booted[i]) + all_booted = 0; + if (all_booted) + break; + udelay(1); + + /* barrier here because uniphier_smp_booted[] may be updated */ + cpu_relax(); + } + + if (!timeout) + printf("warning: some of secondary CPUs may not boot\n"); + + uniphier_cache_disable(); +} + +void psci_board_init(void) +{ + unsigned long scu_base; + u32 scu_ctrl, tmp; + + asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (scu_base)); + + scu_ctrl = readl(scu_base + 0x30); + if (!(scu_ctrl & 1)) + writel(scu_ctrl | 0x1, scu_base + 0x30); + + scu_ctrl = readl(scu_base + SCU_CTRL); + scu_ctrl |= SCU_ENABLE | SCU_STANDBY_ENABLE; + writel(scu_ctrl, scu_base + SCU_CTRL); + + tmp = readl(scu_base + SCU_SNSAC); + tmp |= 0xfff; + writel(tmp, scu_base + SCU_SNSAC); + + uniphier_smp_kick_all_cpus(); +} + +void psci_arch_init(void) +{ + u32 actlr; + + asm("mrc p15, 0, %0, c1, c0, 1" : "=r" (actlr)); + actlr |= 0x41; /* set SMP and FW bits */ + asm("mcr p15, 0, %0, c1, c0, 1" : : "r" (actlr)); +} + +u32 uniphier_psci_holding_pen_release __secure_data = 0xffffffff; + +int __secure psci_cpu_on(u32 function_id, u32 cpuid, u32 entry_point) +{ + u32 cpu = cpuid & 0xff; + + debug_puts("[U-Boot PSCI] psci_cpu_on: cpuid="); + debug_puth(cpuid); + debug_puts(", entry_point="); + debug_puth(entry_point); + debug_puts("\n"); + + psci_save_target_pc(cpu, entry_point); + + /* We assume D-cache is off, so do not call flush_dcache() here */ + uniphier_psci_holding_pen_release = cpu; + + /* Send an event to wake up the secondary CPU. */ + asm("dsb ishst\n" + "sev"); + + return PSCI_RET_SUCCESS; +} diff --git a/arch/arm/mach-uniphier/arm32/psci_smp.S b/arch/arm/mach-uniphier/arm32/psci_smp.S new file mode 100644 index 0000000..aa2fa5f --- /dev/null +++ b/arch/arm/mach-uniphier/arm32/psci_smp.S @@ -0,0 +1,40 @@ +/* + * Copyright (C) 2016 Socionext Inc. + * Author: Masahiro Yamada yamada.masahiro@socionext.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <linux/linkage.h> +#include <asm/system.h> + + .section ._secure.text, "ax" + +ENTRY(uniphier_smp_trampoline) + ldr r0, 0f + mrc p15, 0, r1, c1, c0, 0 @ SCTLR (System Control Register) + orr r1, r1, #CR_I @ Enable ICache + bic r1, r1, #(CR_C | CR_M) @ Disable MMU and Dcache + mcr p15, 0, r1, c1, c0, 0 + + bx r0 +0: .word uniphier_secondary_startup + .globl uniphier_smp_trampoline_end +uniphier_smp_trampoline_end: +ENDPROC(uniphier_smp_trampoline) + +LENTRY(uniphier_secondary_startup) + mrc p15, 0, r1, c0, c0, 5 @ MPIDR (Multiprocessor Affinity Reg) + and r1, r1, #0xff + + ldr r2, =uniphier_smp_booted + mov r0, #1 + str r0, [r2, r1, lsl #2] + + ldr r2, =uniphier_psci_holding_pen_release +pen: ldr r0, [r2] + cmp r0, r1 + beq psci_cpu_entry + wfe + b pen +ENDPROC(uniphier_secondary_startup) diff --git a/arch/arm/mach-uniphier/debug.h b/arch/arm/mach-uniphier/debug.h new file mode 100644 index 0000000..bc16f77 --- /dev/null +++ b/arch/arm/mach-uniphier/debug.h @@ -0,0 +1,68 @@ +/* + * Copyright (C) 2016 Socionext Inc. + * Author: Masahiro Yamada yamada.masahiro@socionext.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef __DEBUG_H__ +#define __DEBUG_H__ + +#include <linux/io.h> +#include <linux/serial_reg.h> + +#define DEBUG_UART_BASE 0x54006800 +#define UART_SHIFT 2 + +#define UNIPHIER_UART_TX 0 +#define UNIPHIER_UART_LSR (5 * 4) + +/* All functions are inline so that they can be called from .secure section. */ + +#ifdef DEBUG +static inline void debug_putc(int c) +{ + void __iomem *base = (void __iomem *)DEBUG_UART_BASE; + + while (!(readl(base + UNIPHIER_UART_LSR) & UART_LSR_THRE)) + ; + + writel(c, base + UNIPHIER_UART_TX); +} + +static inline void debug_puts(const char *s) +{ + while (*s) { + if (*s == '\n') + debug_putc('\r'); + + debug_putc(*s++); + } +} + +static inline void debug_puth(unsigned long val) +{ + int i; + unsigned char c; + + for (i = 8; i--; ) { + c = ((val >> (i * 4)) & 0xf); + c += (c >= 10) ? 'a' - 10 : '0'; + debug_putc(c); + } +} +#else +static inline void debug_putc(int c) +{ +} + +static inline void debug_puts(const char *s) +{ +} + +static inline void debug_puth(unsigned long val) +{ +} +#endif + +#endif /* __DEBUG_H__ */ diff --git a/arch/arm/mach-uniphier/sbc/sbc-regs.h b/arch/arm/mach-uniphier/sbc/sbc-regs.h index a5dca74..927b14c 100644 --- a/arch/arm/mach-uniphier/sbc/sbc-regs.h +++ b/arch/arm/mach-uniphier/sbc/sbc-regs.h @@ -75,7 +75,6 @@ #define SBCTRL74 (SBCTRL_BASE + 0x170)
#define PC0CTRL 0x598000c0 -#define ROM_BOOT_ROMRSV2 0x59801208
#ifndef __ASSEMBLY__ #include <linux/io.h> diff --git a/include/configs/uniphier.h b/include/configs/uniphier.h index 9ee125f..f09efba 100644 --- a/include/configs/uniphier.h +++ b/include/configs/uniphier.h @@ -9,6 +9,9 @@ #ifndef __CONFIG_UNIPHIER_COMMON_H__ #define __CONFIG_UNIPHIER_COMMON_H__
+#define CONFIG_ARMV7_PSCI +#define CONFIG_ARMV7_PSCI_NR_CPUS 4 + #define CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS 10
#define CONFIG_SMC911X