GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/trusted-firmware/trusted-firmware-a-2.8/plat/nvidia/tegra/drivers/bpmp/bpmp.c

@@ -0,0 +1,231 @@
+/*
+ * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch_helpers.h>
+#include <assert.h>
+#include <bpmp.h>
+#include <common/debug.h>
+#include <drivers/delay_timer.h>
+#include <errno.h>
+#include <lib/mmio.h>
+#include <plat/common/platform.h>
+#include <stdbool.h>
+#include <string.h>
+#include <tegra_def.h>
+
+#define BPMP_TIMEOUT	500 /* 500ms */
+
+static uint32_t channel_base[NR_CHANNELS];
+static uint32_t bpmp_init_state = BPMP_INIT_PENDING;
+
+static uint32_t channel_field(unsigned int ch)
+{
+	return mmio_read_32(TEGRA_RES_SEMA_BASE + STA_OFFSET) & CH_MASK(ch);
+}
+
+static bool master_free(unsigned int ch)
+{
+	return channel_field(ch) == MA_FREE(ch);
+}
+
+static bool master_acked(unsigned int ch)
+{
+	return channel_field(ch) == MA_ACKD(ch);
+}
+
+static void signal_slave(unsigned int ch)
+{
+	mmio_write_32(TEGRA_RES_SEMA_BASE + CLR_OFFSET, CH_MASK(ch));
+}
+
+static void free_master(unsigned int ch)
+{
+	mmio_write_32(TEGRA_RES_SEMA_BASE + CLR_OFFSET,
+		      MA_ACKD(ch) ^ MA_FREE(ch));
+}
+
+/* should be called with local irqs disabled */
+int32_t tegra_bpmp_send_receive_atomic(int mrq, const void *ob_data, int ob_sz,
+		void *ib_data, int ib_sz)
+{
+	unsigned int ch = (unsigned int)plat_my_core_pos();
+	mb_data_t *p = (mb_data_t *)(uintptr_t)channel_base[ch];
+	int32_t ret = -ETIMEDOUT, timeout = 0;
+
+	if (bpmp_init_state == BPMP_INIT_COMPLETE) {
+
+		/* loop until BPMP is free */
+		for (timeout = 0; timeout < BPMP_TIMEOUT; timeout++) {
+			if (master_free(ch) == true) {
+				break;
+			}
+
+			mdelay(1);
+		}
+
+		if (timeout != BPMP_TIMEOUT) {
+
+			/* generate the command struct */
+			p->code = mrq;
+			p->flags = DO_ACK;
+			(void)memcpy((void *)p->data, ob_data, (size_t)ob_sz);
+
+			/* signal command ready to the BPMP */
+			signal_slave(ch);
+			mmio_write_32(TEGRA_PRI_ICTLR_BASE + CPU_IEP_FIR_SET,
+				      (1U << INT_SHR_SEM_OUTBOX_FULL));
+
+			/* loop until the command is executed */
+			for (timeout = 0; timeout < BPMP_TIMEOUT; timeout++) {
+				if (master_acked(ch) == true) {
+					break;
+				}
+
+				mdelay(1);
+			}
+
+			if (timeout != BPMP_TIMEOUT) {
+
+				/* get the command response */
+				(void)memcpy(ib_data, (const void *)p->data,
+					     (size_t)ib_sz);
+
+				/* return error code */
+				ret = p->code;
+
+				/* free this channel */
+				free_master(ch);
+			}
+		}
+
+	} else {
+		/* return error code */
+		ret = -EINVAL;
+	}
+
+	if (timeout == BPMP_TIMEOUT) {
+		ERROR("Timed out waiting for bpmp's response\n");
+	}
+
+	return ret;
+}
+
+int tegra_bpmp_init(void)
+{
+	uint32_t val, base, timeout = BPMP_TIMEOUT;
+	unsigned int ch;
+	int ret = 0;
+
+	if (bpmp_init_state == BPMP_INIT_PENDING) {
+
+		/* check if the bpmp processor is alive. */
+		do {
+			val = mmio_read_32(TEGRA_RES_SEMA_BASE + STA_OFFSET);
+			if (val != SIGN_OF_LIFE) {
+				mdelay(1);
+				timeout--;
+			}
+
+		} while ((val != SIGN_OF_LIFE) && (timeout > 0U));
+
+		if (val == SIGN_OF_LIFE) {
+
+			/* check if clock for the atomics block is enabled */
+			val = mmio_read_32(TEGRA_CAR_RESET_BASE + TEGRA_CLK_ENB_V);
+			if ((val & CAR_ENABLE_ATOMICS) == 0) {
+				ERROR("Clock to the atomics block is disabled\n");
+			}
+
+			/* check if the atomics block is out of reset */
+			val = mmio_read_32(TEGRA_CAR_RESET_BASE + TEGRA_RST_DEV_CLR_V);
+			if ((val & CAR_ENABLE_ATOMICS) == CAR_ENABLE_ATOMICS) {
+				ERROR("Reset to the atomics block is asserted\n");
+			}
+
+			/* base address to get the result from Atomics */
+			base = TEGRA_ATOMICS_BASE + RESULT0_REG_OFFSET;
+
+			/* channel area is setup by BPMP before signaling handshake */
+			for (ch = 0; ch < NR_CHANNELS; ch++) {
+
+				/* issue command to get the channel base address */
+				mmio_write_32(base, (ch << TRIGGER_ID_SHIFT) |
+					      ATOMIC_CMD_GET);
+
+				/* get the base address for the channel */
+				channel_base[ch] = mmio_read_32(base);
+
+				/* increment result register offset */
+				base += 4U;
+			}
+
+			/* mark state as "initialized" */
+			bpmp_init_state = BPMP_INIT_COMPLETE;
+
+			/* the channel values have to be visible across all cpus */
+			flush_dcache_range((uint64_t)channel_base,
+					   sizeof(channel_base));
+			flush_dcache_range((uint64_t)&bpmp_init_state,
+					   sizeof(bpmp_init_state));
+
+			INFO("%s: done\n", __func__);
+
+		} else {
+			ERROR("BPMP not powered on\n");
+
+			/* bpmp is not present in the system */
+			bpmp_init_state = BPMP_NOT_PRESENT;
+
+			/* communication timed out */
+			ret = -ETIMEDOUT;
+		}
+	}
+
+	return ret;
+}
+
+void tegra_bpmp_suspend(void)
+{
+	/* freeze the interface */
+	if (bpmp_init_state == BPMP_INIT_COMPLETE) {
+		bpmp_init_state = BPMP_SUSPEND_ENTRY;
+		flush_dcache_range((uint64_t)&bpmp_init_state,
+				   sizeof(bpmp_init_state));
+	}
+}
+
+void tegra_bpmp_resume(void)
+{
+	uint32_t val, timeout = 0;
+
+	if (bpmp_init_state == BPMP_SUSPEND_ENTRY) {
+
+		/* check if the bpmp processor is alive. */
+		do {
+
+			val = mmio_read_32(TEGRA_RES_SEMA_BASE + STA_OFFSET);
+			if (val != SIGN_OF_LIFE) {
+				mdelay(1);
+				timeout++;
+			}
+
+		} while ((val != SIGN_OF_LIFE) && (timeout < BPMP_TIMEOUT));
+
+		if (val == SIGN_OF_LIFE) {
+
+			INFO("%s: BPMP took %d ms to resume\n", __func__, timeout);
+
+			/* mark state as "initialized" */
+			bpmp_init_state = BPMP_INIT_COMPLETE;
+
+			/* state has to be visible across all cpus */
+			flush_dcache_range((uint64_t)&bpmp_init_state,
+					   sizeof(bpmp_init_state));
+		} else {
+			ERROR("BPMP not powered on\n");
+		}
+	}
+}