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authorSascha Hauer <s.hauer@pengutronix.de>2017-02-13 09:26:04 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2017-02-13 09:26:04 +0100
commit30139163b75970fcd58df6b6b987883e36571046 (patch)
tree00bd354cefa617f8474cc73994b1a72c11e770a0 /arch/arm/cpu/psci.c
parentbb1a6a2fd3cc41be6db1a1362f311456019317b1 (diff)
parent19df384cec181be4407f82377ffbb3059b1ed748 (diff)
downloadbarebox-30139163b75970fcd58df6b6b987883e36571046.tar.gz
Merge branch 'for-next/imx'
Diffstat (limited to 'arch/arm/cpu/psci.c')
-rw-r--r--arch/arm/cpu/psci.c311
1 files changed, 311 insertions, 0 deletions
diff --git a/arch/arm/cpu/psci.c b/arch/arm/cpu/psci.c
new file mode 100644
index 0000000..d650c23
--- /dev/null
+++ b/arch/arm/cpu/psci.c
@@ -0,0 +1,311 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; version 2.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#define pr_fmt(fmt) "psci: " fmt
+
+#include <common.h>
+#include <asm/psci.h>
+#include <asm/arm-smccc.h>
+#include <asm/secure.h>
+#include <asm/system.h>
+#include <restart.h>
+#include <globalvar.h>
+#include <init.h>
+#include <magicvar.h>
+
+#ifdef CONFIG_ARM_PSCI_DEBUG
+
+/*
+ * PSCI debugging functions. Board code can specify a putc() function
+ * which is used for debugging output. Beware that this function is
+ * called while the kernel is running. This means the kernel could have
+ * turned off clocks, configured other baudrates and other stuff that
+ * might confuse the putc function. So it can well be that the debugging
+ * code itself is the problem when somethings not working. You have been
+ * warned.
+ */
+
+static void (*__putc)(void *ctx, int c);
+static void *putc_ctx;
+
+void psci_set_putc(void (*putcf)(void *ctx, int c), void *ctx)
+{
+ __putc = putcf;
+ putc_ctx = ctx;
+}
+
+void psci_putc(char c)
+{
+ if (__putc)
+ __putc(putc_ctx, c);
+}
+
+int psci_puts(const char *str)
+{
+ int n = 0;
+
+ while (*str) {
+ if (*str == '\n')
+ psci_putc('\r');
+
+ psci_putc(*str);
+ str++;
+ n++;
+ }
+
+ return n;
+}
+
+int psci_printf(const char *fmt, ...)
+{
+ va_list args;
+ uint i;
+ char printbuffer[128];
+
+ va_start(args, fmt);
+ i = vsprintf(printbuffer, fmt, args);
+ va_end(args);
+
+ psci_puts(printbuffer);
+
+ return i;
+}
+#endif
+
+static struct psci_ops *psci_ops;
+
+void psci_set_ops(struct psci_ops *ops)
+{
+ psci_ops = ops;
+}
+
+static unsigned long psci_version(void)
+{
+ psci_printf("%s\n", __func__);
+ return ARM_PSCI_VER_1_0;
+}
+
+static unsigned long psci_cpu_suspend(u32 power_state, unsigned long entry,
+ u32 context_id)
+{
+ psci_printf("%s\n", __func__);
+
+ if (psci_ops->cpu_off)
+ return psci_ops->cpu_suspend(power_state, entry, context_id);
+
+ return ARM_PSCI_RET_NOT_SUPPORTED;
+}
+
+static unsigned long psci_cpu_off(void)
+{
+ psci_printf("%s\n", __func__);
+
+ if (psci_ops->cpu_off)
+ return psci_ops->cpu_off();
+
+ return ARM_PSCI_RET_NOT_SUPPORTED;
+}
+
+static unsigned long cpu_entry[ARM_SECURE_MAX_CPU];
+static unsigned long context[ARM_SECURE_MAX_CPU];
+
+static unsigned long psci_cpu_on(u32 cpu_id, unsigned long entry, u32 context_id)
+{
+ psci_printf("%s: %d 0x%08lx\n", __func__, cpu_id, entry);
+
+ if (cpu_id >= ARM_SECURE_MAX_CPU)
+ return ARM_PSCI_RET_INVAL;
+
+ cpu_entry[cpu_id] = entry;
+ context[cpu_id] = context_id;
+ dsb();
+
+ if (psci_ops->cpu_on)
+ return psci_ops->cpu_on(cpu_id);
+
+ return ARM_PSCI_RET_NOT_SUPPORTED;
+}
+
+static unsigned long psci_system_off(void)
+{
+ psci_printf("%s\n", __func__);
+
+ if (psci_ops->system_reset)
+ psci_ops->system_reset();
+
+ while(1);
+
+ return 0;
+}
+
+static unsigned long psci_system_reset(void)
+{
+ psci_printf("%s\n", __func__);
+
+ if (psci_ops->system_reset)
+ psci_ops->system_reset();
+
+ restart_machine();
+}
+
+void psci_entry(u32 r0, u32 r1, u32 r2, u32 r3, u32 r4, u32 r5, u32 r6,
+ struct arm_smccc_res *res)
+{
+ int mmuon;
+ unsigned long ttb;
+
+ mmuon = get_cr() & CR_M;
+ asm volatile ("mrc p15, 0, %0, c2, c0, 0" : "=r"(ttb));
+
+ psci_printf("%s entry, function: 0x%08x\n", __func__, r0);
+
+ switch (r0) {
+ case ARM_PSCI_0_2_FN_PSCI_VERSION:
+ res->a0 = psci_version();
+ break;
+ case ARM_PSCI_0_2_FN_CPU_SUSPEND:
+ res->a0 = psci_cpu_suspend(r1, r2, r3);
+ break;
+ case ARM_PSCI_0_2_FN_CPU_OFF:
+ res->a0 = psci_cpu_off();
+ break;
+ case ARM_PSCI_0_2_FN_CPU_ON:
+ res->a0 = psci_cpu_on(r1, r2, r3);
+ break;
+ case ARM_PSCI_0_2_FN_SYSTEM_OFF:
+ psci_system_off();
+ break;
+ case ARM_PSCI_0_2_FN_SYSTEM_RESET:
+ psci_system_reset();
+ break;
+ default:
+ res->a0 = ARM_PSCI_RET_NOT_SUPPORTED;
+ break;
+ }
+}
+
+static int of_psci_fixup(struct device_node *root, void *unused)
+{
+ struct device_node *psci;
+ int ret;
+
+ if (bootm_arm_security_state() < ARM_STATE_NONSECURE)
+ return 0;
+
+ psci = of_create_node(root, "/psci");
+ if (!psci)
+ return -EINVAL;
+
+ ret = of_set_property(psci, "compatible", "arm,psci-1.0",
+ strlen("arm,psci-1.0") + 1, 1);
+ if (ret)
+ return ret;
+
+ ret = of_set_property(psci, "method", "smc",
+ strlen("smc") + 1, 1);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+int psci_cpu_entry_c(void)
+{
+ void (*entry)(u32 context);
+ int cpu;
+ u32 context_id;
+
+ __armv7_secure_monitor_install();
+ cpu = psci_get_cpu_id();
+ entry = (void *)cpu_entry[cpu];
+ context_id = context[cpu];
+
+ if (bootm_arm_security_state() == ARM_STATE_HYP)
+ armv7_switch_to_hyp();
+
+ psci_printf("core #%d enter function 0x%p\n", cpu, entry);
+
+ entry(context_id);
+
+ while (1);
+}
+
+static int armv7_psci_init(void)
+{
+ return of_register_fixup(of_psci_fixup, NULL);
+}
+device_initcall(armv7_psci_init);
+
+#ifdef DEBUG
+
+#include <command.h>
+#include <getopt.h>
+#include "mmu.h"
+
+void second_entry(void)
+{
+ struct arm_smccc_res res;
+
+ psci_printf("2nd CPU online, now turn off again\n");
+
+ arm_smccc_smc(ARM_PSCI_0_2_FN_CPU_OFF,
+ 0, 0, 0, 0, 0, 0, 0, &res);
+
+ psci_printf("2nd CPU still alive?\n");
+
+ while (1);
+}
+
+static int do_smc(int argc, char *argv[])
+{
+ int opt;
+ struct arm_smccc_res res = {
+ .a0 = 0xdeadbee0,
+ .a1 = 0xdeadbee1,
+ .a2 = 0xdeadbee2,
+ .a3 = 0xdeadbee3,
+ };
+
+ while ((opt = getopt(argc, argv, "nicz")) > 0) {
+ switch (opt) {
+ case 'n':
+ armv7_secure_monitor_install();
+ break;
+ case 'i':
+ arm_smccc_smc(ARM_PSCI_0_2_FN_PSCI_VERSION,
+ 0, 0, 0, 0, 0, 0, 0, &res);
+ printf("found psci version %ld.%ld\n", res.a0 >> 16, res.a0 & 0xffff);
+ break;
+ case 'c':
+ arm_smccc_smc(ARM_PSCI_0_2_FN_CPU_ON,
+ 1, (unsigned long)second_entry, 0, 0, 0, 0, 0, &res);
+ break;
+ }
+ }
+
+
+ return 0;
+}
+BAREBOX_CMD_HELP_START(smc)
+BAREBOX_CMD_HELP_TEXT("Secure monitor code test command")
+BAREBOX_CMD_HELP_TEXT("")
+BAREBOX_CMD_HELP_TEXT("Options:")
+BAREBOX_CMD_HELP_OPT ("-n", "Install secure monitor and switch to nonsecure mode")
+BAREBOX_CMD_HELP_OPT ("-i", "Show information about installed PSCI version")
+BAREBOX_CMD_HELP_OPT ("-c", "Start secondary CPU core")
+BAREBOX_CMD_HELP_OPT ("-z", "Turn off secondary CPU core")
+BAREBOX_CMD_HELP_END
+
+BAREBOX_CMD_START(smc)
+ .cmd = do_smc,
+ BAREBOX_CMD_DESC("secure monitor test command")
+BAREBOX_CMD_END
+#endif \ No newline at end of file