1 files changed, 256 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/omap-secure.c b/arch/arm/mach-omap2/omap-secure.c
new file mode 100644
index 0000000000..29c7350b06
--- /dev/null
+++ b/arch/arm/mach-omap2/omap-secure.c
@@ -0,0 +1,256 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * OMAP Secure API infrastructure.
+ *
+ * Copyright (C) 2011 Texas Instruments, Inc.
+ *	Santosh Shilimkar <santosh.shilimkar@ti.com>
+ * Copyright (C) 2012 Ivaylo Dimitrov <freemangordon@abv.bg>
+ * Copyright (C) 2013 Pali Rohár <pali@kernel.org>
+ */
+
+#include <linux/arm-smccc.h>
+#include <linux/cpu_pm.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/memblock.h>
+#include <linux/of.h>
+
+#include <asm/cacheflush.h>
+#include <asm/memblock.h>
+
+#include "common.h"
+#include "omap-secure.h"
+#include "soc.h"
+
+static phys_addr_t omap_secure_memblock_base;
+
+bool optee_available;
+
+#define OMAP_SIP_SMC_STD_CALL_VAL(func_num) \
+	ARM_SMCCC_CALL_VAL(ARM_SMCCC_STD_CALL, ARM_SMCCC_SMC_32, \
+	ARM_SMCCC_OWNER_SIP, (func_num))
+
+static void __init omap_optee_init_check(void)
+{
+	struct device_node *np;
+
+	/*
+	 * We only check that the OP-TEE node is present and available. The
+	 * OP-TEE kernel driver is not needed for the type of interaction made
+	 * with OP-TEE here so the driver's status is not checked.
+	 */
+	np = of_find_node_by_path("/firmware/optee");
+	if (np && of_device_is_available(np))
+		optee_available = true;
+	of_node_put(np);
+}
+
+/**
+ * omap_sec_dispatcher: Routine to dispatch low power secure
+ * service routines
+ * @idx: The HAL API index
+ * @flag: The flag indicating criticality of operation
+ * @nargs: Number of valid arguments out of four.
+ * @arg1, arg2, arg3 args4: Parameters passed to secure API
+ *
+ * Return the non-zero error value on failure.
+ */
+u32 omap_secure_dispatcher(u32 idx, u32 flag, u32 nargs, u32 arg1, u32 arg2,
+							 u32 arg3, u32 arg4)
+{
+	static u32 buf[NR_CPUS][5];
+	u32 *param;
+	int cpu;
+	u32 ret;
+
+	cpu = get_cpu();
+	param = buf[cpu];
+
+	param[0] = nargs;
+	param[1] = arg1;
+	param[2] = arg2;
+	param[3] = arg3;
+	param[4] = arg4;
+
+	/*
+	 * Secure API needs physical address
+	 * pointer for the parameters
+	 */
+	flush_cache_all();
+	outer_clean_range(__pa(param), __pa(param + 5));
+	ret = omap_smc2(idx, flag, __pa(param));
+
+	put_cpu();
+
+	return ret;
+}
+
+void omap_smccc_smc(u32 fn, u32 arg)
+{
+	struct arm_smccc_res res;
+
+	arm_smccc_smc(OMAP_SIP_SMC_STD_CALL_VAL(fn), arg,
+		      0, 0, 0, 0, 0, 0, &res);
+	WARN(res.a0, "Secure function call 0x%08x failed\n", fn);
+}
+
+void omap_smc1(u32 fn, u32 arg)
+{
+	/*
+	 * If this platform has OP-TEE installed we use ARM SMC calls
+	 * otherwise fall back to the OMAP ROM style calls.
+	 */
+	if (optee_available)
+		omap_smccc_smc(fn, arg);
+	else
+		_omap_smc1(fn, arg);
+}
+
+/* Allocate the memory to save secure ram */
+int __init omap_secure_ram_reserve_memblock(void)
+{
+	u32 size = OMAP_SECURE_RAM_STORAGE;
+
+	size = ALIGN(size, SECTION_SIZE);
+	omap_secure_memblock_base = arm_memblock_steal(size, SECTION_SIZE);
+
+	return 0;
+}
+
+#if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_PM)
+u32 omap3_save_secure_ram(void *addr, int size)
+{
+	static u32 param[5];
+	u32 ret;
+
+	if (size != OMAP3_SAVE_SECURE_RAM_SZ)
+		return OMAP3_SAVE_SECURE_RAM_SZ;
+
+	param[0] = 4;		/* Number of arguments */
+	param[1] = __pa(addr);	/* Physical address for saving */
+	param[2] = 0;
+	param[3] = 1;
+	param[4] = 1;
+
+	ret = save_secure_ram_context(__pa(param));
+
+	return ret;
+}
+#endif
+
+/**
+ * rx51_secure_dispatcher: Routine to dispatch secure PPA API calls
+ * @idx: The PPA API index
+ * @process: Process ID
+ * @flag: The flag indicating criticality of operation
+ * @nargs: Number of valid arguments out of four.
+ * @arg1, arg2, arg3 args4: Parameters passed to secure API
+ *
+ * Return the non-zero error value on failure.
+ *
+ * NOTE: rx51_secure_dispatcher differs from omap_secure_dispatcher because
+ *       it calling omap_smc3() instead omap_smc2() and param[0] is nargs+1
+ */
+static u32 rx51_secure_dispatcher(u32 idx, u32 process, u32 flag, u32 nargs,
+			   u32 arg1, u32 arg2, u32 arg3, u32 arg4)
+{
+	static u32 param[5];
+	u32 ret;
+
+	param[0] = nargs+1; /* RX-51 needs number of arguments + 1 */
+	param[1] = arg1;
+	param[2] = arg2;
+	param[3] = arg3;
+	param[4] = arg4;
+
+	/*
+	 * Secure API needs physical address
+	 * pointer for the parameters
+	 */
+	local_irq_disable();
+	local_fiq_disable();
+	flush_cache_all();
+	outer_clean_range(__pa(param), __pa(param + 5));
+	ret = omap_smc3(idx, process, flag, __pa(param));
+	flush_cache_all();
+	local_fiq_enable();
+	local_irq_enable();
+
+	return ret;
+}
+
+/**
+ * rx51_secure_update_aux_cr: Routine to modify the contents of Auxiliary Control Register
+ *  @set_bits: bits to set in ACR
+ *  @clr_bits: bits to clear in ACR
+ *
+ * Return the non-zero error value on failure.
+*/
+u32 rx51_secure_update_aux_cr(u32 set_bits, u32 clear_bits)
+{
+	u32 acr;
+
+	/* Read ACR */
+	asm volatile ("mrc p15, 0, %0, c1, c0, 1" : "=r" (acr));
+	acr &= ~clear_bits;
+	acr |= set_bits;
+
+	return rx51_secure_dispatcher(RX51_PPA_WRITE_ACR,
+				      0,
+				      FLAG_START_CRITICAL,
+				      1, acr, 0, 0, 0);
+}
+
+/**
+ * rx51_secure_rng_call: Routine for HW random generator
+ */
+u32 rx51_secure_rng_call(u32 ptr, u32 count, u32 flag)
+{
+	return rx51_secure_dispatcher(RX51_PPA_HWRNG,
+				      0,
+				      NO_FLAG,
+				      3, ptr, count, flag, 0);
+}
+
+void __init omap_secure_init(void)
+{
+	omap_optee_init_check();
+}
+
+/*
+ * Dummy dispatcher call after core OSWR and MPU off. Updates the ROM return
+ * address after MMU has been re-enabled after CPU1 has been woken up again.
+ * Otherwise the ROM code will attempt to use the earlier physical return
+ * address that got set with MMU off when waking up CPU1. Only used on secure
+ * devices.
+ */
+static int cpu_notifier(struct notifier_block *nb, unsigned long cmd, void *v)
+{
+	switch (cmd) {
+	case CPU_CLUSTER_PM_EXIT:
+		omap_secure_dispatcher(OMAP4_PPA_SERVICE_0,
+				       FLAG_START_CRITICAL,
+				       0, 0, 0, 0, 0);
+		break;
+	default:
+		break;
+	}
+
+	return NOTIFY_OK;
+}
+
+static struct notifier_block secure_notifier_block = {
+	.notifier_call = cpu_notifier,
+};
+
+static int __init secure_pm_init(void)
+{
+	if (omap_type() == OMAP2_DEVICE_TYPE_GP || !soc_is_omap44xx())
+		return 0;
+
+	cpu_pm_register_notifier(&secure_notifier_block);
+
+	return 0;
+}
+omap_arch_initcall(secure_pm_init);