diff options
Diffstat (limited to 'target/linux/ramips/patches-3.8/0113-MIPS-ralink-add-support-for-periodic-timer-irq.patch')
-rw-r--r-- | target/linux/ramips/patches-3.8/0113-MIPS-ralink-add-support-for-periodic-timer-irq.patch | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/target/linux/ramips/patches-3.8/0113-MIPS-ralink-add-support-for-periodic-timer-irq.patch b/target/linux/ramips/patches-3.8/0113-MIPS-ralink-add-support-for-periodic-timer-irq.patch new file mode 100644 index 000000000..57ba5b203 --- /dev/null +++ b/target/linux/ramips/patches-3.8/0113-MIPS-ralink-add-support-for-periodic-timer-irq.patch @@ -0,0 +1,228 @@ +From cdbc5a9dbd78a771edb6c211edbc677596cbd17f Mon Sep 17 00:00:00 2001 +From: John Crispin <blogic@openwrt.org> +Date: Sat, 23 Mar 2013 19:44:41 +0100 +Subject: [PATCH 113/121] MIPS: ralink: add support for periodic timer irq + +Adds a driver for the periodic timer found on Ralink SoC. + +Signed-off-by: John Crispin <blogic@openwrt.org> +--- + arch/mips/ralink/Makefile | 2 +- + arch/mips/ralink/timer.c | 192 +++++++++++++++++++++++++++++++++++++++++++++ + 2 files changed, 193 insertions(+), 1 deletion(-) + create mode 100644 arch/mips/ralink/timer.c + +diff --git a/arch/mips/ralink/Makefile b/arch/mips/ralink/Makefile +index 341b4de..cae7d88 100644 +--- a/arch/mips/ralink/Makefile ++++ b/arch/mips/ralink/Makefile +@@ -6,7 +6,7 @@ + # Copyright (C) 2009-2011 Gabor Juhos <juhosg@openwrt.org> + # Copyright (C) 2013 John Crispin <blogic@openwrt.org> + +-obj-y := prom.o of.o reset.o clk.o irq.o pinmux.o ++obj-y := prom.o of.o reset.o clk.o irq.o pinmux.o timer.o + + obj-$(CONFIG_SOC_RT288X) += rt288x.o + obj-$(CONFIG_SOC_RT305X) += rt305x.o +diff --git a/arch/mips/ralink/timer.c b/arch/mips/ralink/timer.c +new file mode 100644 +index 0000000..9a943e8 +--- /dev/null ++++ b/arch/mips/ralink/timer.c +@@ -0,0 +1,192 @@ ++/* ++ * This program is free software; you can redistribute it and/or modify it ++ * under the terms of the GNU General Public License version 2 as published ++ * by the Free Software Foundation. ++ * ++ * Copyright (C) 2013 John Crispin <blogic@openwrt.org> ++*/ ++ ++#include <linux/module.h> ++#include <linux/platform_device.h> ++#include <linux/interrupt.h> ++#include <linux/timer.h> ++#include <linux/of_gpio.h> ++#include <linux/clk.h> ++ ++#include <asm/mach-ralink/ralink_regs.h> ++ ++#define TIMER_REG_TMRSTAT 0x00 ++#define TIMER_REG_TMR0LOAD 0x10 ++#define TIMER_REG_TMR0CTL 0x18 ++ ++#define TMRSTAT_TMR0INT BIT(0) ++ ++#define TMR0CTL_ENABLE BIT(7) ++#define TMR0CTL_MODE_PERIODIC BIT(4) ++#define TMR0CTL_PRESCALER 1 ++#define TMR0CTL_PRESCALE_VAL (0xf - TMR0CTL_PRESCALER) ++#define TMR0CTL_PRESCALE_DIV (65536 / BIT(TMR0CTL_PRESCALER)) ++ ++struct rt_timer { ++ struct device *dev; ++ void __iomem *membase; ++ int irq; ++ unsigned long timer_freq; ++ unsigned long timer_div; ++}; ++ ++static inline void rt_timer_w32(struct rt_timer *rt, u8 reg, u32 val) ++{ ++ __raw_writel(val, rt->membase + reg); ++} ++ ++static inline u32 rt_timer_r32(struct rt_timer *rt, u8 reg) ++{ ++ return __raw_readl(rt->membase + reg); ++} ++ ++static irqreturn_t rt_timer_irq(int irq, void *_rt) ++{ ++ struct rt_timer *rt = (struct rt_timer *) _rt; ++ ++ rt_timer_w32(rt, TIMER_REG_TMR0LOAD, rt->timer_freq / rt->timer_div); ++ rt_timer_w32(rt, TIMER_REG_TMRSTAT, TMRSTAT_TMR0INT); ++ ++ return IRQ_HANDLED; ++} ++ ++ ++static int rt_timer_request(struct rt_timer *rt) ++{ ++ int err = request_irq(rt->irq, rt_timer_irq, IRQF_DISABLED, ++ dev_name(rt->dev), rt); ++ if (err) { ++ dev_err(rt->dev, "failed to request irq\n"); ++ } else { ++ u32 t = TMR0CTL_MODE_PERIODIC | TMR0CTL_PRESCALE_VAL; ++ rt_timer_w32(rt, TIMER_REG_TMR0CTL, t); ++ } ++ return err; ++} ++ ++static void rt_timer_free(struct rt_timer *rt) ++{ ++ free_irq(rt->irq, rt); ++} ++ ++static int rt_timer_config(struct rt_timer *rt, unsigned long divisor) ++{ ++ if (rt->timer_freq < divisor) ++ rt->timer_div = rt->timer_freq; ++ else ++ rt->timer_div = divisor; ++ ++ rt_timer_w32(rt, TIMER_REG_TMR0LOAD, rt->timer_freq / rt->timer_div); ++ ++ return 0; ++} ++ ++static int rt_timer_enable(struct rt_timer *rt) ++{ ++ u32 t; ++ ++ rt_timer_w32(rt, TIMER_REG_TMR0LOAD, rt->timer_freq / rt->timer_div); ++ ++ t = rt_timer_r32(rt, TIMER_REG_TMR0CTL); ++ t |= TMR0CTL_ENABLE; ++ rt_timer_w32(rt, TIMER_REG_TMR0CTL, t); ++ ++ return 0; ++} ++ ++static void rt_timer_disable(struct rt_timer *rt) ++{ ++ u32 t; ++ ++ t = rt_timer_r32(rt, TIMER_REG_TMR0CTL); ++ t &= ~TMR0CTL_ENABLE; ++ rt_timer_w32(rt, TIMER_REG_TMR0CTL, t); ++} ++ ++static int rt_timer_probe(struct platform_device *pdev) ++{ ++ struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); ++ struct rt_timer *rt; ++ struct clk *clk; ++ ++ if (!res) { ++ dev_err(&pdev->dev, "no memory resource found\n"); ++ return -EINVAL; ++ } ++ ++ rt = devm_kzalloc(&pdev->dev, sizeof(*rt), GFP_KERNEL); ++ if (!rt) { ++ dev_err(&pdev->dev, "failed to allocate memory\n"); ++ return -ENOMEM; ++ } ++ ++ rt->irq = platform_get_irq(pdev, 0); ++ if (!rt->irq) { ++ dev_err(&pdev->dev, "failed to load irq\n"); ++ return -ENOENT; ++ } ++ ++ rt->membase = devm_request_and_ioremap(&pdev->dev, res); ++ if (!rt->membase) { ++ dev_err(&pdev->dev, "failed to ioremap\n"); ++ return -ENOMEM; ++ } ++ ++ clk = devm_clk_get(&pdev->dev, NULL); ++ if (IS_ERR(clk)) { ++ dev_err(&pdev->dev, "failed get clock rate\n"); ++ return PTR_ERR(clk); ++ } ++ ++ rt->timer_freq = clk_get_rate(clk) / TMR0CTL_PRESCALE_DIV; ++ if (!rt->timer_freq) ++ return -EINVAL; ++ ++ rt->dev = &pdev->dev; ++ platform_set_drvdata(pdev, rt); ++ ++ rt_timer_request(rt); ++ rt_timer_config(rt, 2); ++ rt_timer_enable(rt); ++ ++ dev_info(&pdev->dev, "maximum frequncy is %luHz\n", rt->timer_freq); ++ ++ return 0; ++} ++ ++static int rt_timer_remove(struct platform_device *pdev) ++{ ++ struct rt_timer *rt = platform_get_drvdata(pdev); ++ ++ rt_timer_disable(rt); ++ rt_timer_free(rt); ++ ++ return 0; ++} ++ ++static const struct of_device_id rt_timer_match[] = { ++ { .compatible = "ralink,rt2880-timer" }, ++ {}, ++}; ++MODULE_DEVICE_TABLE(of, rt_timer_match); ++ ++static struct platform_driver rt_timer_driver = { ++ .probe = rt_timer_probe, ++ .remove = rt_timer_remove, ++ .driver = { ++ .name = "rt-timer", ++ .owner = THIS_MODULE, ++ .of_match_table = rt_timer_match ++ }, ++}; ++ ++module_platform_driver(rt_timer_driver); ++ ++MODULE_DESCRIPTION("Ralink RT2880 timer"); ++MODULE_AUTHOR("John Crispin <blogic@openwrt.org"); ++MODULE_LICENSE("GPL"); +-- +1.7.10.4 + |