linux-kernel - [PATCH] MIPS: Add RTC support for Loongson1C board

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Date:   Tue, 6 Sep 2016 10:11:38 +0800
From:   Yang Ling <gnaygnil@...il.com>
To:     keguang.zhang@...il.com, ralf@...ux-mips.org
Cc:     gnaygnil@...il.com, linux-mips@...ux-mips.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] 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@...il.com>
---
 arch/mips/include/asm/mach-loongson32/platform.h |  1 +
 arch/mips/loongson32/common/platform.c           | 13 +++++++++++++
 arch/mips/loongson32/ls1c/Makefile               |  2 +-
 arch/mips/loongson32/ls1c/board.c                |  9 ++++-----
 4 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/arch/mips/include/asm/mach-loongson32/platform.h b/arch/mips/include/asm/mach-loongson32/platform.h
index 672531a..7adc313 100644
--- a/arch/mips/include/asm/mach-loongson32/platform.h
+++ b/arch/mips/include/asm/mach-loongson32/platform.h
@@ -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 */
diff --git a/arch/mips/loongson32/common/platform.c b/arch/mips/loongson32/common/platform.c
index 4d12e36..beff085 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 891eac4..a92c6cd 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 3d69bd6..a96bed5 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@...il.com>
+ * Copyright (c) 2016 Yang Ling <gnaygnil@...il.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);
-- 
1.9.1