[U-Boot] [PATCH 14/14] ARM: uniphier: add PSCI support for UniPhier ARMv7 SoCs
Masahiro Yamada
yamada.masahiro at socionext.com
Wed Aug 10 09:08:49 CEST 2016
Currently, only the CPU_ON function is supported.
Signed-off-by: Masahiro Yamada <yamada.masahiro at 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 at 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 at 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 at 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
--
1.9.1
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