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rk_fiq_debugger: Reset and set uart to loopback mode before init

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The uart may be reinitialized when resume, if uart is in busy
state, which would fail to configure the baud rate. So reset
and set uart to loopback mode can make sure uart is in idle
state.

Change-Id: I54d9ac8de1531cd06da8c223583cd2e330178eff
Signed-off-by: Huibin Hong <huibin.hong@rock-chips.com>
This commit is contained in:
Huibin Hong
2016-09-26 16:09:10 +08:00
committed by Huang, Tao
parent 97ff73ffbc
commit 087633170d
1 changed files with 8 additions and 0 deletions
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8
drivers/soc/rockchip/rk_fiq_debugger.c
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@@ -36,6 +36,7 @@
#include <../drivers/staging/android/fiq_debugger/fiq_debugger.h>
#include <linux/irqchip/arm-gic.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/soc/rockchip/rk_fiq_debugger.h>
#ifdef CONFIG_FIQ_DEBUGGER_EL3_TO_EL1
@@ -48,6 +49,7 @@
#define UART_USR_TX_FIFO_EMPTY 0x04 /* Transmit FIFO empty */
#define UART_USR_TX_FIFO_NOT_FULL 0x02 /* Transmit FIFO not full */
#define UART_USR_BUSY 0x01 /* UART busy indicator */
#define UART_SRR 0x22 /* software reset register */
struct rk_fiq_debugger {
int irq;
@@ -102,6 +104,11 @@ static int debug_port_init(struct platform_device *pdev)
dll = 0xd;
break;
}
/* reset uart */
rk_fiq_write(t, 0x07, UART_SRR);
udelay(10);
/* set uart to loop back mode */
rk_fiq_write(t, 0x10, UART_MCR);
rk_fiq_write(t, 0x83, UART_LCR);
/* set baud rate */
@@ -118,6 +125,7 @@ static int debug_port_init(struct platform_device *pdev)
found unregistered, so it is disable.
hhb@rock-chips.com */
rk_fiq_write(t, 0xc1, UART_FCR);
rk_fiq_write(t, 0x0, UART_MCR);
return 0;
}