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clocksource: nomadik-mtu: support of probe

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Support device tree probe of the nomadik-mtu clocksource.

Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
This commit is contained in:
Rabin Vincent 2013-04-03 13:28:26 +02:00 • committed by Linus Walleij
parent f722406faa
commit c7785ea0d2
1 changed files with 58 additions and 12 deletions
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70
drivers/clocksource/nomadik-mtu.c
View file

@ -13,6 +13,9 @@
#include <linux/io.h> #include <linux/io.h>
#include <linux/clockchips.h> #include <linux/clockchips.h>
#include <linux/clocksource.h> #include <linux/clocksource.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/clk.h> #include <linux/clk.h>
#include <linux/jiffies.h> #include <linux/jiffies.h>
#include <linux/delay.h> #include <linux/delay.h>
@ -188,22 +191,15 @@ static struct irqaction nmdk_timer_irq = {
.dev_id = &nmdk_clkevt, .dev_id = &nmdk_clkevt,
}; };
void __init nmdk_timer_init(void __iomem *base, int irq) static void __init __nmdk_timer_init(void __iomem *base, int irq,
struct clk *pclk, struct clk *clk)
{ {
unsigned long rate; unsigned long rate;
struct clk *clk0, *pclk0;
mtu_base = base; mtu_base = base;
pclk0 = clk_get_sys("mtu0", "apb_pclk"); BUG_ON(clk_prepare_enable(pclk));
BUG_ON(IS_ERR(pclk0)); BUG_ON(clk_prepare_enable(clk));
BUG_ON(clk_prepare(pclk0) < 0);
BUG_ON(clk_enable(pclk0) < 0);
clk0 = clk_get_sys("mtu0", NULL);
BUG_ON(IS_ERR(clk0));
BUG_ON(clk_prepare(clk0) < 0);
BUG_ON(clk_enable(clk0) < 0);
/* /*
* Tick rate is 2.4MHz for Nomadik and 2.4Mhz, 100MHz or 133 MHz * Tick rate is 2.4MHz for Nomadik and 2.4Mhz, 100MHz or 133 MHz
@ -213,7 +209,7 @@ void __init nmdk_timer_init(void __iomem *base, int irq)
* to wake-up at a max 127s a head in time. Dividing a 2.4 MHz timer * to wake-up at a max 127s a head in time. Dividing a 2.4 MHz timer
* with 16 gives too low timer resolution. * with 16 gives too low timer resolution.
*/ */
rate = clk_get_rate(clk0); rate = clk_get_rate(clk);
if (rate > 32000000) { if (rate > 32000000) {
rate /= 16; rate /= 16;
clk_prescale = MTU_CRn_PRESCALE_16; clk_prescale = MTU_CRn_PRESCALE_16;
@ -247,3 +243,53 @@ void __init nmdk_timer_init(void __iomem *base, int irq)
mtu_delay_timer.freq = rate; mtu_delay_timer.freq = rate;
register_current_timer_delay(&mtu_delay_timer); register_current_timer_delay(&mtu_delay_timer);
} }
void __init nmdk_timer_init(void __iomem *base, int irq)
{
struct clk *clk0, *pclk0;
pclk0 = clk_get_sys("mtu0", "apb_pclk");
BUG_ON(IS_ERR(pclk0));
clk0 = clk_get_sys("mtu0", NULL);
BUG_ON(IS_ERR(clk0));
__nmdk_timer_init(base, irq, pclk0, clk0);
}
static struct of_device_id nmdk_timer_match[] __initconst = {
{ .compatible = "st,nomadik-mtu" },
{}
};
static void __init nmdk_timer_of_init(void)
{
struct device_node *node;
struct clk *pclk;
struct clk *clk;
void __iomem *base;
int irq;
node = of_find_matching_node(NULL, nmdk_timer_match);
if (!node)
panic("No timer node");
base = of_iomap(node, 0);
if (!base)
panic("Can't remap registers");
pclk = of_clk_get_by_name(node, "apb_pclk");
if (IS_ERR(pclk))
panic("could not get apb_pclk");
clk = of_clk_get_by_name(node, "timclk");
if (IS_ERR(clk))
panic("could not get timclk");
irq = irq_of_parse_and_map(node, 0);
if (irq <= 0)
panic("Can't parse IRQ");
__nmdk_timer_init(base, irq, pclk, clk);
}
CLOCKSOURCE_OF_DECLARE(nomadik_mtu, "st,nomadik-mtu",
nmdk_timer_of_init);