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

source/trusted-firmware/trusted-firmware-a-2.8/plat/socionext/uniphier/uniphier_console_setup.c

@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2019-2020, Socionext Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+
+#include <drivers/console.h>
+#include <errno.h>
+#include <lib/mmio.h>
+#include <plat/common/platform.h>
+
+#include "uniphier.h"
+#include "uniphier_console.h"
+
+#define UNIPHIER_UART_OFFSET	0x100
+#define UNIPHIER_UART_NR_PORTS	4
+
+/* These callbacks are implemented in assembly to use crash_console_helpers.S */
+int uniphier_console_putc(int character, struct console *console);
+int uniphier_console_getc(struct console *console);
+void uniphier_console_flush(struct console *console);
+
+static console_t uniphier_console = {
+	.flags = CONSOLE_FLAG_BOOT |
+#if DEBUG
+		 CONSOLE_FLAG_RUNTIME |
+#endif
+		 CONSOLE_FLAG_CRASH |
+		 CONSOLE_FLAG_TRANSLATE_CRLF,
+	.putc = uniphier_console_putc,
+	.getc = uniphier_console_getc,
+	.flush = uniphier_console_flush,
+};
+
+static const uintptr_t uniphier_uart_base[] = {
+	[UNIPHIER_SOC_LD11] = 0x54006800,
+	[UNIPHIER_SOC_LD20] = 0x54006800,
+	[UNIPHIER_SOC_PXS3] = 0x54006800,
+};
+
+/*
+ * There are 4 UART ports available on this platform. By default, we want to
+ * use the same one as used in the previous firmware stage.
+ */
+static uintptr_t uniphier_console_get_base(unsigned int soc)
+{
+	uintptr_t base, end;
+	uint32_t div;
+
+	assert(soc < ARRAY_SIZE(uniphier_uart_base));
+	base = uniphier_uart_base[soc];
+	end = base + UNIPHIER_UART_OFFSET * UNIPHIER_UART_NR_PORTS;
+
+	while (base < end) {
+		div = mmio_read_32(base + UNIPHIER_UART_DLR);
+		if (div)
+			return base;
+		base += UNIPHIER_UART_OFFSET;
+	}
+
+	return 0;
+}
+
+static void uniphier_console_init(uintptr_t base)
+{
+	mmio_write_32(base + UNIPHIER_UART_FCR, UNIPHIER_UART_FCR_ENABLE_FIFO);
+	mmio_write_32(base + UNIPHIER_UART_LCR_MCR,
+		      UNIPHIER_UART_LCR_WLEN8 << 8);
+}
+
+void uniphier_console_setup(unsigned int soc)
+{
+	uintptr_t base;
+
+	base = uniphier_console_get_base(soc);
+	if (!base)
+		plat_error_handler(-EINVAL);
+
+	uniphier_console.base = base;
+	console_register(&uniphier_console);
+
+	/*
+	 * The hardware might be still printing characters queued up in the
+	 * previous firmware stage. Make sure the transmitter is empty before
+	 * any initialization. Otherwise, the console might get corrupted.
+	 */
+	console_flush();
+
+	uniphier_console_init(base);
+}