mediatek: mt8183: add MTK uart driver for controlling clock gate
Add uart clock gate contol for suspend/resume scenario.
Signed-off-by: kenny liang <kenny.liang@mediatek.com>
Change-Id: Id4197b0720630ec6c74aec206a9b206511bf515a
diff --git a/plat/mediatek/mt8183/drivers/uart/uart.c b/plat/mediatek/mt8183/drivers/uart/uart.c
new file mode 100644
index 0000000..3c6a980
--- /dev/null
+++ b/plat/mediatek/mt8183/drivers/uart/uart.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <lib/mmio.h>
+#include <uart.h>
+
+static struct mt_uart uart_save_addr[DRV_SUPPORT_UART_PORTS];
+
+static const unsigned int uart_base_addr[DRV_SUPPORT_UART_PORTS] = {
+ UART0_BASE,
+ UART1_BASE
+};
+
+void mt_uart_restore(void)
+{
+ int uart_idx = UART_PORT0;
+ struct mt_uart *uart;
+ unsigned long base;
+
+ /* Must NOT print any debug log before UART restore */
+ for (uart_idx = UART_PORT0; uart_idx < HW_SUPPORT_UART_PORTS;
+ uart_idx++) {
+
+ uart = &uart_save_addr[uart_idx];
+ base = uart->base;
+
+ mmio_write_32(UART_LCR(base), UART_LCR_MODE_B);
+ mmio_write_32(UART_EFR(base), uart->registers.efr);
+ mmio_write_32(UART_LCR(base), uart->registers.lcr);
+ mmio_write_32(UART_FCR(base), uart->registers.fcr);
+
+ /* baudrate */
+ mmio_write_32(UART_HIGHSPEED(base), uart->registers.highspeed);
+ mmio_write_32(UART_FRACDIV_L(base), uart->registers.fracdiv_l);
+ mmio_write_32(UART_FRACDIV_M(base), uart->registers.fracdiv_m);
+ mmio_write_32(UART_LCR(base),
+ uart->registers.lcr | UART_LCR_DLAB);
+ mmio_write_32(UART_DLL(base), uart->registers.dll);
+ mmio_write_32(UART_DLH(base), uart->registers.dlh);
+ mmio_write_32(UART_LCR(base), uart->registers.lcr);
+ mmio_write_32(UART_SAMPLE_COUNT(base),
+ uart->registers.sample_count);
+ mmio_write_32(UART_SAMPLE_POINT(base),
+ uart->registers.sample_point);
+ mmio_write_32(UART_GUARD(base), uart->registers.guard);
+
+ /* flow control */
+ mmio_write_32(UART_ESCAPE_EN(base), uart->registers.escape_en);
+ mmio_write_32(UART_MCR(base), uart->registers.mcr);
+ mmio_write_32(UART_IER(base), uart->registers.ier);
+ mmio_write_32(UART_SCR(base), uart->registers.scr);
+ }
+}
+
+void mt_uart_save(void)
+{
+ int uart_idx = UART_PORT0;
+ struct mt_uart *uart;
+ unsigned long base;
+
+ for (uart_idx = UART_PORT0; uart_idx < HW_SUPPORT_UART_PORTS;
+ uart_idx++) {
+
+ uart_save_addr[uart_idx].base = uart_base_addr[uart_idx];
+ base = uart_base_addr[uart_idx];
+ uart = &uart_save_addr[uart_idx];
+ uart->registers.lcr = mmio_read_32(UART_LCR(base));
+
+ mmio_write_32(UART_LCR(base), UART_LCR_MODE_B);
+ uart->registers.efr = mmio_read_32(UART_EFR(base));
+ mmio_write_32(UART_LCR(base), uart->registers.lcr);
+ uart->registers.fcr = mmio_read_32(UART_FCR_RD(base));
+
+ /* baudrate */
+ uart->registers.highspeed = mmio_read_32(UART_HIGHSPEED(base));
+ uart->registers.fracdiv_l = mmio_read_32(UART_FRACDIV_L(base));
+ uart->registers.fracdiv_m = mmio_read_32(UART_FRACDIV_M(base));
+ mmio_write_32(UART_LCR(base),
+ uart->registers.lcr | UART_LCR_DLAB);
+ uart->registers.dll = mmio_read_32(UART_DLL(base));
+ uart->registers.dlh = mmio_read_32(UART_DLH(base));
+ mmio_write_32(UART_LCR(base), uart->registers.lcr);
+ uart->registers.sample_count = mmio_read_32(
+ UART_SAMPLE_COUNT(base));
+ uart->registers.sample_point = mmio_read_32(
+ UART_SAMPLE_POINT(base));
+ uart->registers.guard = mmio_read_32(UART_GUARD(base));
+
+ /* flow control */
+ uart->registers.escape_en = mmio_read_32(UART_ESCAPE_EN(base));
+ uart->registers.mcr = mmio_read_32(UART_MCR(base));
+ uart->registers.ier = mmio_read_32(UART_IER(base));
+ uart->registers.scr = mmio_read_32(UART_SCR(base));
+ }
+}
+
+void mt_console_uart_cg(int on)
+{
+ if (on)
+ mmio_write_32(UART_CLOCK_GATE_CLR, UART0_CLOCK_GATE_BIT);
+ else
+ mmio_write_32(UART_CLOCK_GATE_SET, UART0_CLOCK_GATE_BIT);
+}
+
+int mt_console_uart_cg_status(void)
+{
+ return mmio_read_32(UART_CLOCK_GATE_STA) & UART0_CLOCK_GATE_BIT;
+}