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authorYang Ling <gnaygnil@gmail.com>2016-09-06 05:11:38 +0300
committerRalf Baechle <ralf@linux-mips.org>2016-10-04 17:13:57 +0300
commit60219c563c9b62aac237631a7c9aa092e8396138 (patch)
tree128403687dec398acf1e4656c2030f9c180f6735 /arch/mips/loongson32
parent9f3b8081a4763022ccfabaffc485094be0064fa4 (diff)
downloadlinux-60219c563c9b62aac237631a7c9aa092e8396138.tar.xz
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>
Diffstat (limited to 'arch/mips/loongson32')
-rw-r--r--arch/mips/loongson32/common/platform.c13
-rw-r--r--arch/mips/loongson32/ls1c/Makefile2
-rw-r--r--arch/mips/loongson32/ls1c/board.c9
3 files changed, 18 insertions, 6 deletions
diff --git a/arch/mips/loongson32/common/platform.c b/arch/mips/loongson32/common/platform.c
index 4d12e365dcb0..beff0852c6a4 100644
--- a/arch/mips/loongson32/common/platform.c
+++ b/arch/mips/loongson32/common/platform.c
@@ -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",
diff --git a/arch/mips/loongson32/ls1c/Makefile b/arch/mips/loongson32/ls1c/Makefile
index 891eac482b82..a92c6cd3418d 100644
--- a/arch/mips/loongson32/ls1c/Makefile
+++ b/arch/mips/loongson32/ls1c/Makefile
@@ -1,5 +1,5 @@
#
-# Makefile for loongson1B based machines.
+# Makefile for loongson1C based machines.
#
obj-y += board.o
diff --git a/arch/mips/loongson32/ls1c/board.c b/arch/mips/loongson32/ls1c/board.c
index 3d69bd63ad56..a96bed5e3ea6 100644
--- a/arch/mips/loongson32/ls1c/board.c
+++ b/arch/mips/loongson32/ls1c/board.c
@@ -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);