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MIPS: Add RTC support for Loongson1C board 

The patch adds RTC support for Loongson1C board, and enable the external
crystal when the RTC is first powered up.

Signed-off-by: Yang Ling <gnaygnil@gmail.com>
Cc: keguang.zhang@gmail.com
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14214/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
hifive-unleashed-5.1
Yang Ling 2016-09-06 10:11:38 +08:00 committed by Ralf Baechle
parent 9f3b8081a4
commit 60219c563c
4 changed files with 19 additions and 6 deletions
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1
arch/mips/include/asm/mach-loongson32/platform.h
View File

@ -30,5 +30,6 @@ void __init ls1x_clk_init(void);
void __init ls1x_dma_set_platdata(struct plat_ls1x_dma *pdata);
void __init ls1x_nand_set_platdata(struct plat_ls1x_nand *pdata);
void __init ls1x_serial_set_uartclk(struct platform_device *pdev);
void __init ls1x_rtc_set_extclk(struct platform_device *pdev);
#endif /* __ASM_MACH_LOONGSON32_PLATFORM_H */

13
arch/mips/loongson32/common/platform.c
View File

@ -23,6 +23,10 @@
#include <dma.h>
#include <nand.h>
#define LS1X_RTC_CTRL ((void __iomem *)KSEG1ADDR(LS1X_RTC_BASE + 0x40))
#define RTC_EXTCLK_OK (BIT(5) | BIT(8))
#define RTC_EXTCLK_EN BIT(8)
/* 8250/16550 compatible UART */
#define LS1X_UART(_id) \
{ \
@ -66,6 +70,15 @@ void __init ls1x_serial_set_uartclk(struct platform_device *pdev)
p->uartclk = clk_get_rate(clk);
}
void __init ls1x_rtc_set_extclk(struct platform_device *pdev)
{
u32 val;
val = __raw_readl(LS1X_RTC_CTRL);
if (!(val & RTC_EXTCLK_OK))
__raw_writel(val | RTC_EXTCLK_EN, LS1X_RTC_CTRL);
}
/* CPUFreq */
static struct plat_ls1x_cpufreq ls1x_cpufreq_pdata = {
.clk_name = "cpu_clk",

2
arch/mips/loongson32/ls1c/Makefile
View File

@ -1,5 +1,5 @@
#
# Makefile for loongson1B based machines.
# Makefile for loongson1C based machines.
#
obj-y += board.o

9
arch/mips/loongson32/ls1c/board.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 2016 Ling Yang <gnaygnil@gmail.com>
* Copyright (c) 2016 Yang Ling <gnaygnil@gmail.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
@ -12,17 +12,16 @@
static struct platform_device *ls1c_platform_devices[] __initdata = {
&ls1x_uart_pdev,
&ls1x_eth0_pdev,
&ls1x_rtc_pdev,
};
static int __init ls1c_platform_init(void)
{
int err;
ls1x_serial_set_uartclk(&ls1x_uart_pdev);
ls1x_rtc_set_extclk(&ls1x_rtc_pdev);
err = platform_add_devices(ls1c_platform_devices,
return platform_add_devices(ls1c_platform_devices,
ARRAY_SIZE(ls1c_platform_devices));
return err;
}
arch_initcall(ls1c_platform_init);