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;
+}
diff --git a/plat/mediatek/mt8183/drivers/uart/uart.h b/plat/mediatek/mt8183/drivers/uart/uart.h
new file mode 100644
index 0000000..be04c35
--- /dev/null
+++ b/plat/mediatek/mt8183/drivers/uart/uart.h
@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __UART_H__
+#define __UART_H__
+
+#include <platform_def.h>
+
+/* UART HW information */
+#define HW_SUPPORT_UART_PORTS 2
+#define DRV_SUPPORT_UART_PORTS 2
+
+/* console UART clock cg */
+#define UART_CLOCK_GATE_SET (INFRACFG_AO_BASE + 0x80)
+#define UART_CLOCK_GATE_CLR (INFRACFG_AO_BASE + 0x84)
+#define UART_CLOCK_GATE_STA (INFRACFG_AO_BASE + 0x90)
+#define UART0_CLOCK_GATE_BIT (1U<<22)
+#define UART1_CLOCK_GATE_BIT (1U<<23)
+
+/* UART registers */
+#define UART_RBR(_baseaddr) (_baseaddr + 0x0)
+#define UART_THR(_baseaddr) (_baseaddr + 0x0)
+#define UART_IER(_baseaddr) (_baseaddr + 0x4)
+#define UART_IIR(_baseaddr) (_baseaddr + 0x8)
+#define UART_FCR(_baseaddr) (_baseaddr + 0x8)
+#define UART_LCR(_baseaddr) (_baseaddr + 0xc)
+#define UART_MCR(_baseaddr) (_baseaddr + 0x10)
+#define UART_LSR(_baseaddr) (_baseaddr + 0x14)
+#define UART_MSR(_baseaddr) (_baseaddr + 0x18)
+#define UART_SCR(_baseaddr) (_baseaddr + 0x1c)
+#define UART_DLL(_baseaddr) (_baseaddr + 0x0)
+#define UART_DLH(_baseaddr) (_baseaddr + 0x4)
+#define UART_EFR(_baseaddr) (_baseaddr + 0x8)
+#define UART_XON1(_baseaddr) (_baseaddr + 0x10)
+#define UART_XON2(_baseaddr) (_baseaddr + 0x14)
+#define UART_XOFF1(_baseaddr) (_baseaddr + 0x18)
+#define UART_XOFF2(_baseaddr) (_baseaddr + 0x1c)
+#define UART_AUTOBAUD(_baseaddr) (_baseaddr + 0x20)
+#define UART_HIGHSPEED(_baseaddr) (_baseaddr + 0x24)
+#define UART_SAMPLE_COUNT(_baseaddr) (_baseaddr + 0x28)
+#define UART_SAMPLE_POINT(_baseaddr) (_baseaddr + 0x2c)
+#define UART_AUTOBAUD_REG(_baseaddr) (_baseaddr + 0x30)
+#define UART_RATE_FIX_REG(_baseaddr) (_baseaddr + 0x34)
+#define UART_AUTO_BAUDSAMPLE(_baseaddr) (_baseaddr + 0x38)
+#define UART_GUARD(_baseaddr) (_baseaddr + 0x3c)
+#define UART_ESCAPE_DAT(_baseaddr) (_baseaddr + 0x40)
+#define UART_ESCAPE_EN(_baseaddr) (_baseaddr + 0x44)
+#define UART_SLEEP_EN(_baseaddr) (_baseaddr + 0x48)
+#define UART_DMA_EN(_baseaddr) (_baseaddr + 0x4c)
+#define UART_RXTRI_AD(_baseaddr) (_baseaddr + 0x50)
+#define UART_FRACDIV_L(_baseaddr) (_baseaddr + 0x54)
+#define UART_FRACDIV_M(_baseaddr) (_baseaddr + 0x58)
+#define UART_FCR_RD(_baseaddr) (_baseaddr + 0x5C)
+#define UART_USB_RX_SEL(_baseaddr) (_baseaddr + 0xB0)
+#define UART_SLEEP_REQ(_baseaddr) (_baseaddr + 0xB4)
+#define UART_SLEEP_ACK(_baseaddr) (_baseaddr + 0xB8)
+#define UART_SPM_SEL(_baseaddr) (_baseaddr + 0xBC)
+#define UART_LCR_DLAB 0x0080
+#define UART_LCR_MODE_B 0x00bf
+
+enum uart_port_ID {
+ UART_PORT0 = 0,
+ UART_PORT1
+};
+
+struct mt_uart_register {
+ unsigned int dll;
+ unsigned int dlh;
+ unsigned int ier;
+ unsigned int lcr;
+ unsigned int mcr;
+ unsigned int fcr;
+ unsigned int lsr;
+ unsigned int scr;
+ unsigned int efr;
+ unsigned int highspeed;
+ unsigned int sample_count;
+ unsigned int sample_point;
+ unsigned int fracdiv_l;
+ unsigned int fracdiv_m;
+ unsigned int escape_en;
+ unsigned int guard;
+ unsigned int rx_sel;
+};
+
+struct mt_uart {
+ unsigned long base;
+ struct mt_uart_register registers;
+};
+
+/* external API */
+void mt_uart_save(void);
+void mt_uart_restore(void);
+void mt_console_uart_cg(int on);
+int mt_console_uart_cg_status(void);
+
+#endif /* __UART_H__ */
diff --git a/plat/mediatek/mt8183/include/platform_def.h b/plat/mediatek/mt8183/include/platform_def.h
index f802ac2..dab265b 100644
--- a/plat/mediatek/mt8183/include/platform_def.h
+++ b/plat/mediatek/mt8183/include/platform_def.h
@@ -87,6 +87,7 @@
* UART related constants
******************************************************************************/
#define UART0_BASE (IO_PHYS + 0x01002000)
+#define UART1_BASE (IO_PHYS + 0x01003000)
#define UART_BAUDRATE 115200
#define UART_CLOCK 26000000
diff --git a/plat/mediatek/mt8183/platform.mk b/plat/mediatek/mt8183/platform.mk
index 09fd133..3053a87 100644
--- a/plat/mediatek/mt8183/platform.mk
+++ b/plat/mediatek/mt8183/platform.mk
@@ -13,6 +13,7 @@
-I${MTK_PLAT_SOC}/drivers/gpio/ \
-I${MTK_PLAT_SOC}/drivers/pmic/ \
-I${MTK_PLAT_SOC}/drivers/rtc/ \
+ -I${MTK_PLAT_SOC}/drivers/uart/ \
-I${MTK_PLAT_SOC}/include/
PLAT_BL_COMMON_SOURCES := lib/xlat_tables/aarch64/xlat_tables.c \
@@ -47,6 +48,7 @@
${MTK_PLAT_SOC}/drivers/rtc/rtc.c \
${MTK_PLAT_SOC}/drivers/spmc/mtspmc.c \
${MTK_PLAT_SOC}/drivers/gpio/mtgpio.c \
+ ${MTK_PLAT_SOC}/drivers/uart/uart.c \
${MTK_PLAT_SOC}/plat_pm.c \
${MTK_PLAT_SOC}/plat_topology.c \
${MTK_PLAT_SOC}/plat_mt_gic.c \
