From 60219c563c9b62aac237631a7c9aa092e8396138 Mon Sep 17 00:00:00 2001 From: Yang Ling Date: Tue, 6 Sep 2016 10:11:38 +0800 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 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 --- 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 672531aa9bef..7adc31364939 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 4d12e365dcb0..beff0852c6a4 100644 --- a/arch/mips/loongson32/common/platform.c +++ b/arch/mips/loongson32/common/platform.c @@ -23,6 +23,10 @@ #include #include +#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 + * Copyright (c) 2016 Yang Ling * * 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);