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openwrt/target/linux/mvebu/patches-3.10/0167-clocksource-armada-370-xp-Simplify-TIMER_CTRL-regist.patch
Luka Perkov c9ae111a20 mvebu: backport mainline patches from kernel 3.13 
This is a backport of the patches accepted to the Linux mainline related to
mvebu SoC (Armada XP and Armada 370) between Linux v3.12, and Linux v3.13.
This work mainly covers:

* Finishes work for sharing the pxa nand driver(drivers/mtd/nand/pxa3xx_nand.c)
  between the PXA family, and the Armada family.
* timer initialization update, and access function for the Armada family.
* Generic IRQ handling backporting.
* Some bug fixes.

Signed-off-by: Seif Mazareeb <seif.mazareeb@gmail.com>
CC: Luka Perkov <luka@openwrt.org>

SVN-Revision: 39566
2014-02-11 02:07:44 +00:00

175 lines
5.2 KiB
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From 7a5e03909417ccecc85819837d10cbb6ffe1d759 Mon Sep 17 00:00:00 2001
From: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Date: Tue, 13 Aug 2013 11:43:11 -0300
Subject: [PATCH 167/203] clocksource: armada-370-xp: Simplify TIMER_CTRL
register access
This commit creates two functions to access the TIMER_CTRL register:
one for global one for the per-cpu. This makes the code much more
readable. In addition, since the TIMER_CTRL register is also used for
watchdog, this is preparation work for future thread-safe improvements.
Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
drivers/clocksource/time-armada-370-xp.c | 69 ++++++++++++++------------------
1 file changed, 30 insertions(+), 39 deletions(-)
--- a/drivers/clocksource/time-armada-370-xp.c
+++ b/drivers/clocksource/time-armada-370-xp.c
@@ -71,6 +71,18 @@ static u32 ticks_per_jiffy;
static struct clock_event_device __percpu **percpu_armada_370_xp_evt;
+static void timer_ctrl_clrset(u32 clr, u32 set)
+{
+ writel((readl(timer_base + TIMER_CTRL_OFF) & ~clr) | set,
+ timer_base + TIMER_CTRL_OFF);
+}
+
+static void local_timer_ctrl_clrset(u32 clr, u32 set)
+{
+ writel((readl(local_base + TIMER_CTRL_OFF) & ~clr) | set,
+ local_base + TIMER_CTRL_OFF);
+}
+
static u32 notrace armada_370_xp_read_sched_clock(void)
{
return ~readl(timer_base + TIMER0_VAL_OFF);
@@ -83,7 +95,6 @@ static int
armada_370_xp_clkevt_next_event(unsigned long delta,
struct clock_event_device *dev)
{
- u32 u;
/*
* Clear clockevent timer interrupt.
*/
@@ -97,11 +108,8 @@ armada_370_xp_clkevt_next_event(unsigned
/*
* Enable the timer.
*/
- u = readl(local_base + TIMER_CTRL_OFF);
- u = ((u & ~TIMER0_RELOAD_EN) | TIMER0_EN |
- TIMER0_DIV(TIMER_DIVIDER_SHIFT));
- writel(u, local_base + TIMER_CTRL_OFF);
-
+ local_timer_ctrl_clrset(TIMER0_RELOAD_EN,
+ TIMER0_EN | TIMER0_DIV(TIMER_DIVIDER_SHIFT));
return 0;
}
@@ -109,8 +117,6 @@ static void
armada_370_xp_clkevt_mode(enum clock_event_mode mode,
struct clock_event_device *dev)
{
- u32 u;
-
if (mode == CLOCK_EVT_MODE_PERIODIC) {
/*
@@ -122,18 +128,14 @@ armada_370_xp_clkevt_mode(enum clock_eve
/*
* Enable timer.
*/
-
- u = readl(local_base + TIMER_CTRL_OFF);
-
- writel((u | TIMER0_EN | TIMER0_RELOAD_EN |
- TIMER0_DIV(TIMER_DIVIDER_SHIFT)),
- local_base + TIMER_CTRL_OFF);
+ local_timer_ctrl_clrset(0, TIMER0_RELOAD_EN |
+ TIMER0_EN |
+ TIMER0_DIV(TIMER_DIVIDER_SHIFT));
} else {
/*
* Disable timer.
*/
- u = readl(local_base + TIMER_CTRL_OFF);
- writel(u & ~TIMER0_EN, local_base + TIMER_CTRL_OFF);
+ local_timer_ctrl_clrset(TIMER0_EN, 0);
/*
* ACK pending timer interrupt.
@@ -169,18 +171,18 @@ static irqreturn_t armada_370_xp_timer_i
*/
static int __cpuinit armada_370_xp_timer_setup(struct clock_event_device *evt)
{
- u32 u;
+ u32 clr = 0, set = 0;
int cpu = smp_processor_id();
/* Use existing clock_event for cpu 0 */
if (!smp_processor_id())
return 0;
- u = readl(local_base + TIMER_CTRL_OFF);
if (timer25Mhz)
- writel(u | TIMER0_25MHZ, local_base + TIMER_CTRL_OFF);
+ set = TIMER0_25MHZ;
else
- writel(u & ~TIMER0_25MHZ, local_base + TIMER_CTRL_OFF);
+ clr = TIMER0_25MHZ;
+ local_timer_ctrl_clrset(clr, set);
evt->name = armada_370_xp_clkevt.name;
evt->irq = armada_370_xp_clkevt.irq;
@@ -212,7 +214,7 @@ static struct local_timer_ops armada_370
static void __init armada_370_xp_timer_init(struct device_node *np)
{
- u32 u;
+ u32 clr = 0, set = 0;
int res;
timer_base = of_iomap(np, 0);
@@ -221,29 +223,20 @@ static void __init armada_370_xp_timer_i
if (of_find_property(np, "marvell,timer-25Mhz", NULL)) {
/* The fixed 25MHz timer is available so let's use it */
- u = readl(local_base + TIMER_CTRL_OFF);
- writel(u | TIMER0_25MHZ,
- local_base + TIMER_CTRL_OFF);
- u = readl(timer_base + TIMER_CTRL_OFF);
- writel(u | TIMER0_25MHZ,
- timer_base + TIMER_CTRL_OFF);
+ set = TIMER0_25MHZ;
timer_clk = 25000000;
} else {
unsigned long rate = 0;
struct clk *clk = of_clk_get(np, 0);
WARN_ON(IS_ERR(clk));
rate = clk_get_rate(clk);
- u = readl(local_base + TIMER_CTRL_OFF);
- writel(u & ~(TIMER0_25MHZ),
- local_base + TIMER_CTRL_OFF);
-
- u = readl(timer_base + TIMER_CTRL_OFF);
- writel(u & ~(TIMER0_25MHZ),
- timer_base + TIMER_CTRL_OFF);
-
timer_clk = rate / TIMER_DIVIDER;
+
+ clr = TIMER0_25MHZ;
timer25Mhz = false;
}
+ timer_ctrl_clrset(clr, set);
+ local_timer_ctrl_clrset(clr, set);
/*
* We use timer 0 as clocksource, and private(local) timer 0
@@ -265,10 +258,8 @@ static void __init armada_370_xp_timer_i
writel(0xffffffff, timer_base + TIMER0_VAL_OFF);
writel(0xffffffff, timer_base + TIMER0_RELOAD_OFF);
- u = readl(timer_base + TIMER_CTRL_OFF);
-
- writel((u | TIMER0_EN | TIMER0_RELOAD_EN |
- TIMER0_DIV(TIMER_DIVIDER_SHIFT)), timer_base + TIMER_CTRL_OFF);
+ timer_ctrl_clrset(0, TIMER0_EN | TIMER0_RELOAD_EN |
+ TIMER0_DIV(TIMER_DIVIDER_SHIFT));
clocksource_mmio_init(timer_base + TIMER0_VAL_OFF,
"armada_370_xp_clocksource",
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