diff options
author | Rabin Vincent <rabin.vincent@stericsson.com> | 2013-04-03 13:28:26 +0200 |
---|---|---|
committer | Linus Walleij <linus.walleij@linaro.org> | 2013-05-12 21:49:56 +0200 |
commit | c7785ea0d279322bf92107d9a4fee195f5148c08 (patch) | |
tree | c06e8a66706e814d920a0cf3c510be84d8dc1096 /drivers/clocksource/nomadik-mtu.c | |
parent | f722406faae2d073cc1d01063d1123c35425939e (diff) | |
download | linux-c7785ea0d279322bf92107d9a4fee195f5148c08.tar.bz2 |
clocksource: nomadik-mtu: support of probe
Support device tree probe of the nomadik-mtu clocksource.
Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Diffstat (limited to 'drivers/clocksource/nomadik-mtu.c')
-rw-r--r-- | drivers/clocksource/nomadik-mtu.c | 70 |
1 files changed, 58 insertions, 12 deletions
diff --git a/drivers/clocksource/nomadik-mtu.c b/drivers/clocksource/nomadik-mtu.c index e405531e1cc5..7982cb0f25f2 100644 --- a/drivers/clocksource/nomadik-mtu.c +++ b/drivers/clocksource/nomadik-mtu.c @@ -13,6 +13,9 @@ #include <linux/io.h> #include <linux/clockchips.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/jiffies.h> #include <linux/delay.h> @@ -188,22 +191,15 @@ static struct irqaction nmdk_timer_irq = { .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; - struct clk *clk0, *pclk0; mtu_base = base; - pclk0 = clk_get_sys("mtu0", "apb_pclk"); - BUG_ON(IS_ERR(pclk0)); - 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); + BUG_ON(clk_prepare_enable(pclk)); + BUG_ON(clk_prepare_enable(clk)); /* * 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 * with 16 gives too low timer resolution. */ - rate = clk_get_rate(clk0); + rate = clk_get_rate(clk); if (rate > 32000000) { rate /= 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; 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); |