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author | Alexander Shiyan <shc_work@mail.ru> | 2013-03-11 13:26:34 +0400 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2013-03-11 22:17:42 +0100 |
commit | 9d9375e6f41a015fedcb17f890a16455f6aca7e6 (patch) | |
tree | 021b9ec8bd4f75d53471ee02f26aaf83691229e5 /arch/arm/mach-clps711x | |
parent | 5976f09410de9173847070c97b3060453015d419 (diff) | |
download | barebox-9d9375e6f41a015fedcb17f890a16455f6aca7e6.tar.gz barebox-9d9375e6f41a015fedcb17f890a16455f6aca7e6.tar.xz |
ARM: clps711x: Add clocksource driver
This patch adds clocksource driver for CLPS711X targets and adds
support to platform to use this new driver.
Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch/arm/mach-clps711x')
-rw-r--r-- | arch/arm/mach-clps711x/clock.c | 51 |
1 files changed, 25 insertions, 26 deletions
diff --git a/arch/arm/mach-clps711x/clock.c b/arch/arm/mach-clps711x/clock.c index 09cbaf961c..e9576622d9 100644 --- a/arch/arm/mach-clps711x/clock.c +++ b/arch/arm/mach-clps711x/clock.c @@ -9,25 +9,18 @@ #include <common.h> #include <init.h> -#include <clock.h> +#include <sizes.h> #include <asm/io.h> #include <linux/clkdev.h> #include <mach/clps711x.h> +#define CLPS711X_OSC_FREQ 3686400 +#define CLPS711X_EXT_FREQ 13000000 + static struct clk { unsigned long rate; -} uart_clk, bus_clk; - -static uint64_t clocksource_read(void) -{ - return ~readw(TC2D); -} - -static struct clocksource cs = { - .read = clocksource_read, - .mask = CLOCKSOURCE_MASK(16), -}; +} uart_clk, bus_clk, timer_clk; unsigned long clk_get_rate(struct clk *clk) { @@ -50,22 +43,19 @@ EXPORT_SYMBOL(clk_disable); static int clocks_init(void) { - int osc, ext, pll, cpu, timer; + int pll, cpu; u32 tmp; - osc = 3686400; - ext = 13000000; - tmp = readl(PLLR) >> 24; if (tmp) - pll = (osc * tmp) / 2; + pll = (CLPS711X_OSC_FREQ * tmp) / 2; else pll = 73728000; /* Default value for old CPUs */ tmp = readl(SYSFLG2); if (tmp & SYSFLG2_CKMODE) { - cpu = ext; - bus_clk.rate = cpu; + cpu = CLPS711X_EXT_FREQ; + bus_clk.rate = CLPS711X_EXT_FREQ; } else { cpu = pll; if (cpu >= 36864000) @@ -74,25 +64,23 @@ static int clocks_init(void) bus_clk.rate = 36864000 / 2; } - uart_clk.rate = bus_clk.rate / 10; + uart_clk.rate = DIV_ROUND_CLOSEST(bus_clk.rate, 10); if (tmp & SYSFLG2_CKMODE) { tmp = readw(SYSCON2); if (tmp & SYSCON2_OSTB) - timer = ext / 26; + timer_clk.rate = DIV_ROUND_CLOSEST(CLPS711X_EXT_FREQ, 26); else - timer = 541440; + timer_clk.rate = DIV_ROUND_CLOSEST(CLPS711X_EXT_FREQ, 24); } else - timer = cpu / 144; + timer_clk.rate = DIV_ROUND_CLOSEST(cpu, 144); tmp = readl(SYSCON1); tmp &= ~SYSCON1_TC2M; /* Free running mode */ tmp |= SYSCON1_TC2S; /* High frequency source */ writel(tmp, SYSCON1); - clocks_calc_mult_shift(&cs.mult, &cs.shift, timer, NSEC_PER_SEC, 10); - - return init_clock(&cs); + return 0; } core_initcall(clocks_init); @@ -100,6 +88,7 @@ static struct clk_lookup clocks_lookups[] = { CLKDEV_CON_ID("bus", &bus_clk), CLKDEV_DEV_ID("clps711x_serial0", &uart_clk), CLKDEV_DEV_ID("clps711x_serial1", &uart_clk), + CLKDEV_DEV_ID("clps711x-cs", &timer_clk), }; static int clkdev_init(void) @@ -109,3 +98,13 @@ static int clkdev_init(void) return 0; } postcore_initcall(clkdev_init); + +static const char *clps711x_clocksrc_name = "clps711x-cs"; + +static __init int clps711x_core_init(void) +{ + add_generic_device(clps711x_clocksrc_name, DEVICE_ID_SINGLE, NULL, + TC2D, SZ_2, IORESOURCE_MEM, NULL); + return 0; +} +coredevice_initcall(clps711x_core_init); |