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-rw-r--r--arch/arm/mach-exynos/firmware.c261
1 files changed, 261 insertions, 0 deletions
diff --git a/arch/arm/mach-exynos/firmware.c b/arch/arm/mach-exynos/firmware.c
new file mode 100644
index 0000000000..a5e22678e2
--- /dev/null
+++ b/arch/arm/mach-exynos/firmware.c
@@ -0,0 +1,261 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (C) 2012 Samsung Electronics.
+// Kyungmin Park <kyungmin.park@samsung.com>
+// Tomasz Figa <t.figa@samsung.com>
+
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/init.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+#include <asm/cacheflush.h>
+#include <asm/cputype.h>
+#include <asm/firmware.h>
+#include <asm/hardware/cache-l2x0.h>
+#include <asm/suspend.h>
+
+#include "common.h"
+#include "smc.h"
+
+#define EXYNOS_BOOT_ADDR 0x8
+#define EXYNOS_BOOT_FLAG 0xc
+
+static void exynos_save_cp15(void)
+{
+ /* Save Power control and Diagnostic registers */
+ asm ("mrc p15, 0, %0, c15, c0, 0\n"
+ "mrc p15, 0, %1, c15, c0, 1\n"
+ : "=r" (cp15_save_power), "=r" (cp15_save_diag)
+ : : "cc");
+}
+
+static int exynos_do_idle(unsigned long mode)
+{
+ switch (mode) {
+ case FW_DO_IDLE_AFTR:
+ if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9)
+ exynos_save_cp15();
+ writel_relaxed(__pa_symbol(exynos_cpu_resume_ns),
+ sysram_ns_base_addr + 0x24);
+ writel_relaxed(EXYNOS_AFTR_MAGIC, sysram_ns_base_addr + 0x20);
+ if (soc_is_exynos3250()) {
+ flush_cache_all();
+ exynos_smc(SMC_CMD_SAVE, OP_TYPE_CORE,
+ SMC_POWERSTATE_IDLE, 0);
+ exynos_smc(SMC_CMD_SHUTDOWN, OP_TYPE_CLUSTER,
+ SMC_POWERSTATE_IDLE, 0);
+ } else
+ exynos_smc(SMC_CMD_CPU0AFTR, 0, 0, 0);
+ break;
+ case FW_DO_IDLE_SLEEP:
+ exynos_smc(SMC_CMD_SLEEP, 0, 0, 0);
+ }
+ return 0;
+}
+
+static int exynos_cpu_boot(int cpu)
+{
+ /*
+ * Exynos3250 doesn't need to send smc command for secondary CPU boot
+ * because Exynos3250 removes WFE in secure mode.
+ *
+ * On Exynos5 devices the call is ignored by trustzone firmware.
+ */
+ if (!soc_is_exynos4210() && !soc_is_exynos4212() &&
+ !soc_is_exynos4412())
+ return 0;
+
+ /*
+ * The second parameter of SMC_CMD_CPU1BOOT command means CPU id.
+ * But, Exynos4212 has only one secondary CPU so second parameter
+ * isn't used for informing secure firmware about CPU id.
+ */
+ if (soc_is_exynos4212())
+ cpu = 0;
+
+ exynos_smc(SMC_CMD_CPU1BOOT, cpu, 0, 0);
+ return 0;
+}
+
+static int exynos_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
+{
+ void __iomem *boot_reg;
+
+ if (!sysram_ns_base_addr)
+ return -ENODEV;
+
+ boot_reg = sysram_ns_base_addr + 0x1c;
+
+ /*
+ * Almost all Exynos-series of SoCs that run in secure mode don't need
+ * additional offset for every CPU, with Exynos4412 being the only
+ * exception.
+ */
+ if (soc_is_exynos4412())
+ boot_reg += 4 * cpu;
+
+ writel_relaxed(boot_addr, boot_reg);
+ return 0;
+}
+
+static int exynos_get_cpu_boot_addr(int cpu, unsigned long *boot_addr)
+{
+ void __iomem *boot_reg;
+
+ if (!sysram_ns_base_addr)
+ return -ENODEV;
+
+ boot_reg = sysram_ns_base_addr + 0x1c;
+
+ if (soc_is_exynos4412())
+ boot_reg += 4 * cpu;
+
+ *boot_addr = readl_relaxed(boot_reg);
+ return 0;
+}
+
+static int exynos_cpu_suspend(unsigned long arg)
+{
+ flush_cache_all();
+ outer_flush_all();
+
+ exynos_smc(SMC_CMD_SLEEP, 0, 0, 0);
+
+ pr_info("Failed to suspend the system\n");
+ writel(0, sysram_ns_base_addr + EXYNOS_BOOT_FLAG);
+ return 1;
+}
+
+static int exynos_suspend(void)
+{
+ if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9)
+ exynos_save_cp15();
+
+ writel(EXYNOS_SLEEP_MAGIC, sysram_ns_base_addr + EXYNOS_BOOT_FLAG);
+ writel(__pa_symbol(exynos_cpu_resume_ns),
+ sysram_ns_base_addr + EXYNOS_BOOT_ADDR);
+
+ return cpu_suspend(0, exynos_cpu_suspend);
+}
+
+static int exynos_resume(void)
+{
+ writel(0, sysram_ns_base_addr + EXYNOS_BOOT_FLAG);
+
+ return 0;
+}
+
+static const struct firmware_ops exynos_firmware_ops = {
+ .do_idle = IS_ENABLED(CONFIG_EXYNOS_CPU_SUSPEND) ? exynos_do_idle : NULL,
+ .set_cpu_boot_addr = exynos_set_cpu_boot_addr,
+ .get_cpu_boot_addr = exynos_get_cpu_boot_addr,
+ .cpu_boot = exynos_cpu_boot,
+ .suspend = IS_ENABLED(CONFIG_PM_SLEEP) ? exynos_suspend : NULL,
+ .resume = IS_ENABLED(CONFIG_EXYNOS_CPU_SUSPEND) ? exynos_resume : NULL,
+};
+
+static void exynos_l2_write_sec(unsigned long val, unsigned reg)
+{
+ static int l2cache_enabled;
+
+ switch (reg) {
+ case L2X0_CTRL:
+ if (val & L2X0_CTRL_EN) {
+ /*
+ * Before the cache can be enabled, due to firmware
+ * design, SMC_CMD_L2X0INVALL must be called.
+ */
+ if (!l2cache_enabled) {
+ exynos_smc(SMC_CMD_L2X0INVALL, 0, 0, 0);
+ l2cache_enabled = 1;
+ }
+ } else {
+ l2cache_enabled = 0;
+ }
+ exynos_smc(SMC_CMD_L2X0CTRL, val, 0, 0);
+ break;
+
+ case L2X0_DEBUG_CTRL:
+ exynos_smc(SMC_CMD_L2X0DEBUG, val, 0, 0);
+ break;
+
+ default:
+ WARN_ONCE(1, "%s: ignoring write to reg 0x%x\n", __func__, reg);
+ }
+}
+
+static void exynos_l2_configure(const struct l2x0_regs *regs)
+{
+ exynos_smc(SMC_CMD_L2X0SETUP1, regs->tag_latency, regs->data_latency,
+ regs->prefetch_ctrl);
+ exynos_smc(SMC_CMD_L2X0SETUP2, regs->pwr_ctrl, regs->aux_ctrl, 0);
+}
+
+bool __init exynos_secure_firmware_available(void)
+{
+ struct device_node *nd;
+ const __be32 *addr;
+
+ nd = of_find_compatible_node(NULL, NULL,
+ "samsung,secure-firmware");
+ if (!nd)
+ return false;
+
+ addr = of_get_address(nd, 0, NULL, NULL);
+ of_node_put(nd);
+ if (!addr) {
+ pr_err("%s: No address specified.\n", __func__);
+ return false;
+ }
+
+ return true;
+}
+
+void __init exynos_firmware_init(void)
+{
+ if (!exynos_secure_firmware_available())
+ return;
+
+ pr_info("Running under secure firmware.\n");
+
+ register_firmware_ops(&exynos_firmware_ops);
+
+ /*
+ * Exynos 4 SoCs (based on Cortex A9 and equipped with L2C-310),
+ * running under secure firmware, require certain registers of L2
+ * cache controller to be written in secure mode. Here .write_sec
+ * callback is provided to perform necessary SMC calls.
+ */
+ if (IS_ENABLED(CONFIG_CACHE_L2X0) &&
+ read_cpuid_part() == ARM_CPU_PART_CORTEX_A9) {
+ outer_cache.write_sec = exynos_l2_write_sec;
+ outer_cache.configure = exynos_l2_configure;
+ }
+}
+
+#define REG_CPU_STATE_ADDR (sysram_ns_base_addr + 0x28)
+#define BOOT_MODE_MASK 0x1f
+
+void exynos_set_boot_flag(unsigned int cpu, unsigned int mode)
+{
+ unsigned int tmp;
+
+ tmp = readl_relaxed(REG_CPU_STATE_ADDR + cpu * 4);
+
+ if (mode & BOOT_MODE_MASK)
+ tmp &= ~BOOT_MODE_MASK;
+
+ tmp |= mode;
+ writel_relaxed(tmp, REG_CPU_STATE_ADDR + cpu * 4);
+}
+
+void exynos_clear_boot_flag(unsigned int cpu, unsigned int mode)
+{
+ unsigned int tmp;
+
+ tmp = readl_relaxed(REG_CPU_STATE_ADDR + cpu * 4);
+ tmp &= ~mode;
+ writel_relaxed(tmp, REG_CPU_STATE_ADDR + cpu * 4);
+}
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