diff options
Diffstat (limited to 'arch/arm/mach-zynq/timer.c')
| -rw-r--r-- | arch/arm/mach-zynq/timer.c | 146 |
1 files changed, 69 insertions, 77 deletions
diff --git a/arch/arm/mach-zynq/timer.c b/arch/arm/mach-zynq/timer.c index de3df283da7..f9fbc9c1e7a 100644 --- a/arch/arm/mach-zynq/timer.c +++ b/arch/arm/mach-zynq/timer.c @@ -15,39 +15,29 @@ * GNU General Public License for more details. */ -#include <linux/kernel.h> -#include <linux/init.h> #include <linux/interrupt.h> -#include <linux/irq.h> -#include <linux/types.h> -#include <linux/clocksource.h> #include <linux/clockchips.h> -#include <linux/io.h> -#include <linux/of.h> #include <linux/of_address.h> #include <linux/of_irq.h> #include <linux/slab.h> #include <linux/clk-provider.h> - #include "common.h" /* * Timer Register Offset Definitions of Timer 1, Increment base address by 4 * and use same offsets for Timer 2 */ -#define XTTCPSS_CLK_CNTRL_OFFSET 0x00 /* Clock Control Reg, RW */ -#define XTTCPSS_CNT_CNTRL_OFFSET 0x0C /* Counter Control Reg, RW */ -#define XTTCPSS_COUNT_VAL_OFFSET 0x18 /* Counter Value Reg, RO */ -#define XTTCPSS_INTR_VAL_OFFSET 0x24 /* Interval Count Reg, RW */ -#define XTTCPSS_MATCH_1_OFFSET 0x30 /* Match 1 Value Reg, RW */ -#define XTTCPSS_MATCH_2_OFFSET 0x3C /* Match 2 Value Reg, RW */ -#define XTTCPSS_MATCH_3_OFFSET 0x48 /* Match 3 Value Reg, RW */ -#define XTTCPSS_ISR_OFFSET 0x54 /* Interrupt Status Reg, RO */ -#define XTTCPSS_IER_OFFSET 0x60 /* Interrupt Enable Reg, RW */ +#define XTTCPS_CLK_CNTRL_OFFSET 0x00 /* Clock Control Reg, RW */ +#define XTTCPS_CNT_CNTRL_OFFSET 0x0C /* Counter Control Reg, RW */ +#define XTTCPS_COUNT_VAL_OFFSET 0x18 /* Counter Value Reg, RO */ +#define XTTCPS_INTR_VAL_OFFSET 0x24 /* Interval Count Reg, RW */ +#define XTTCPS_ISR_OFFSET 0x54 /* Interrupt Status Reg, RO */ +#define XTTCPS_IER_OFFSET 0x60 /* Interrupt Enable Reg, RW */ -#define XTTCPSS_CNT_CNTRL_DISABLE_MASK 0x1 +#define XTTCPS_CNT_CNTRL_DISABLE_MASK 0x1 -/* Setup the timers to use pre-scaling, using a fixed value for now that will +/* + * Setup the timers to use pre-scaling, using a fixed value for now that will * work across most input frequency, but it may need to be more dynamic */ #define PRESCALE_EXPONENT 11 /* 2 ^ PRESCALE_EXPONENT = PRESCALE */ @@ -57,72 +47,73 @@ #define CNT_CNTRL_RESET (1<<4) /** - * struct xttcpss_timer - This definition defines local timer structure + * struct xttcps_timer - This definition defines local timer structure * * @base_addr: Base address of timer **/ -struct xttcpss_timer { +struct xttcps_timer { void __iomem *base_addr; }; -struct xttcpss_timer_clocksource { - struct xttcpss_timer xttc; +struct xttcps_timer_clocksource { + struct xttcps_timer xttc; struct clocksource cs; }; -#define to_xttcpss_timer_clksrc(x) \ - container_of(x, struct xttcpss_timer_clocksource, cs) +#define to_xttcps_timer_clksrc(x) \ + container_of(x, struct xttcps_timer_clocksource, cs) -struct xttcpss_timer_clockevent { - struct xttcpss_timer xttc; +struct xttcps_timer_clockevent { + struct xttcps_timer xttc; struct clock_event_device ce; struct clk *clk; }; -#define to_xttcpss_timer_clkevent(x) \ - container_of(x, struct xttcpss_timer_clockevent, ce) +#define to_xttcps_timer_clkevent(x) \ + container_of(x, struct xttcps_timer_clockevent, ce) /** - * xttcpss_set_interval - Set the timer interval value + * xttcps_set_interval - Set the timer interval value * * @timer: Pointer to the timer instance * @cycles: Timer interval ticks **/ -static void xttcpss_set_interval(struct xttcpss_timer *timer, +static void xttcps_set_interval(struct xttcps_timer *timer, unsigned long cycles) { u32 ctrl_reg; /* Disable the counter, set the counter value and re-enable counter */ - ctrl_reg = __raw_readl(timer->base_addr + XTTCPSS_CNT_CNTRL_OFFSET); - ctrl_reg |= XTTCPSS_CNT_CNTRL_DISABLE_MASK; - __raw_writel(ctrl_reg, timer->base_addr + XTTCPSS_CNT_CNTRL_OFFSET); + ctrl_reg = __raw_readl(timer->base_addr + XTTCPS_CNT_CNTRL_OFFSET); + ctrl_reg |= XTTCPS_CNT_CNTRL_DISABLE_MASK; + __raw_writel(ctrl_reg, timer->base_addr + XTTCPS_CNT_CNTRL_OFFSET); - __raw_writel(cycles, timer->base_addr + XTTCPSS_INTR_VAL_OFFSET); + __raw_writel(cycles, timer->base_addr + XTTCPS_INTR_VAL_OFFSET); - /* Reset the counter (0x10) so that it starts from 0, one-shot - mode makes this needed for timing to be right. */ + /* + * Reset the counter (0x10) so that it starts from 0, one-shot + * mode makes this needed for timing to be right. + */ ctrl_reg |= CNT_CNTRL_RESET; - ctrl_reg &= ~XTTCPSS_CNT_CNTRL_DISABLE_MASK; - __raw_writel(ctrl_reg, timer->base_addr + XTTCPSS_CNT_CNTRL_OFFSET); + ctrl_reg &= ~XTTCPS_CNT_CNTRL_DISABLE_MASK; + __raw_writel(ctrl_reg, timer->base_addr + XTTCPS_CNT_CNTRL_OFFSET); } /** - * xttcpss_clock_event_interrupt - Clock event timer interrupt handler + * xttcps_clock_event_interrupt - Clock event timer interrupt handler * * @irq: IRQ number of the Timer - * @dev_id: void pointer to the xttcpss_timer instance + * @dev_id: void pointer to the xttcps_timer instance * * returns: Always IRQ_HANDLED - success **/ -static irqreturn_t xttcpss_clock_event_interrupt(int irq, void *dev_id) +static irqreturn_t xttcps_clock_event_interrupt(int irq, void *dev_id) { - struct xttcpss_timer_clockevent *xttce = dev_id; - struct xttcpss_timer *timer = &xttce->xttc; + struct xttcps_timer_clockevent *xttce = dev_id; + struct xttcps_timer *timer = &xttce->xttc; /* Acknowledge the interrupt and call event handler */ - __raw_writel(__raw_readl(timer->base_addr + XTTCPSS_ISR_OFFSET), - timer->base_addr + XTTCPSS_ISR_OFFSET); + __raw_readl(timer->base_addr + XTTCPS_ISR_OFFSET); xttce->ce.event_handler(&xttce->ce); @@ -136,46 +127,46 @@ static irqreturn_t xttcpss_clock_event_interrupt(int irq, void *dev_id) **/ static cycle_t __xttc_clocksource_read(struct clocksource *cs) { - struct xttcpss_timer *timer = &to_xttcpss_timer_clksrc(cs)->xttc; + struct xttcps_timer *timer = &to_xttcps_timer_clksrc(cs)->xttc; return (cycle_t)__raw_readl(timer->base_addr + - XTTCPSS_COUNT_VAL_OFFSET); + XTTCPS_COUNT_VAL_OFFSET); } /** - * xttcpss_set_next_event - Sets the time interval for next event + * xttcps_set_next_event - Sets the time interval for next event * * @cycles: Timer interval ticks * @evt: Address of clock event instance * * returns: Always 0 - success **/ -static int xttcpss_set_next_event(unsigned long cycles, +static int xttcps_set_next_event(unsigned long cycles, struct clock_event_device *evt) { - struct xttcpss_timer_clockevent *xttce = to_xttcpss_timer_clkevent(evt); - struct xttcpss_timer *timer = &xttce->xttc; + struct xttcps_timer_clockevent *xttce = to_xttcps_timer_clkevent(evt); + struct xttcps_timer *timer = &xttce->xttc; - xttcpss_set_interval(timer, cycles); + xttcps_set_interval(timer, cycles); return 0; } /** - * xttcpss_set_mode - Sets the mode of timer + * xttcps_set_mode - Sets the mode of timer * * @mode: Mode to be set * @evt: Address of clock event instance **/ -static void xttcpss_set_mode(enum clock_event_mode mode, +static void xttcps_set_mode(enum clock_event_mode mode, struct clock_event_device *evt) { - struct xttcpss_timer_clockevent *xttce = to_xttcpss_timer_clkevent(evt); - struct xttcpss_timer *timer = &xttce->xttc; + struct xttcps_timer_clockevent *xttce = to_xttcps_timer_clkevent(evt); + struct xttcps_timer *timer = &xttce->xttc; u32 ctrl_reg; switch (mode) { case CLOCK_EVT_MODE_PERIODIC: - xttcpss_set_interval(timer, + xttcps_set_interval(timer, DIV_ROUND_CLOSEST(clk_get_rate(xttce->clk), PRESCALE * HZ)); break; @@ -183,17 +174,17 @@ static void xttcpss_set_mode(enum clock_event_mode mode, case CLOCK_EVT_MODE_UNUSED: case CLOCK_EVT_MODE_SHUTDOWN: ctrl_reg = __raw_readl(timer->base_addr + - XTTCPSS_CNT_CNTRL_OFFSET); - ctrl_reg |= XTTCPSS_CNT_CNTRL_DISABLE_MASK; + XTTCPS_CNT_CNTRL_OFFSET); + ctrl_reg |= XTTCPS_CNT_CNTRL_DISABLE_MASK; __raw_writel(ctrl_reg, - timer->base_addr + XTTCPSS_CNT_CNTRL_OFFSET); + timer->base_addr + XTTCPS_CNT_CNTRL_OFFSET); break; case CLOCK_EVT_MODE_RESUME: ctrl_reg = __raw_readl(timer->base_addr + - XTTCPSS_CNT_CNTRL_OFFSET); - ctrl_reg &= ~XTTCPSS_CNT_CNTRL_DISABLE_MASK; + XTTCPS_CNT_CNTRL_OFFSET); + ctrl_reg &= ~XTTCPS_CNT_CNTRL_DISABLE_MASK; __raw_writel(ctrl_reg, - timer->base_addr + XTTCPSS_CNT_CNTRL_OFFSET); + timer->base_addr + XTTCPS_CNT_CNTRL_OFFSET); break; } } @@ -201,7 +192,7 @@ static void xttcpss_set_mode(enum clock_event_mode mode, static void __init zynq_ttc_setup_clocksource(struct device_node *np, void __iomem *base) { - struct xttcpss_timer_clocksource *ttccs; + struct xttcps_timer_clocksource *ttccs; struct clk *clk; int err; u32 reg; @@ -230,11 +221,11 @@ static void __init zynq_ttc_setup_clocksource(struct device_node *np, ttccs->cs.mask = CLOCKSOURCE_MASK(16); ttccs->cs.flags = CLOCK_SOURCE_IS_CONTINUOUS; - __raw_writel(0x0, ttccs->xttc.base_addr + XTTCPSS_IER_OFFSET); + __raw_writel(0x0, ttccs->xttc.base_addr + XTTCPS_IER_OFFSET); __raw_writel(CLK_CNTRL_PRESCALE | CLK_CNTRL_PRESCALE_EN, - ttccs->xttc.base_addr + XTTCPSS_CLK_CNTRL_OFFSET); + ttccs->xttc.base_addr + XTTCPS_CLK_CNTRL_OFFSET); __raw_writel(CNT_CNTRL_RESET, - ttccs->xttc.base_addr + XTTCPSS_CNT_CNTRL_OFFSET); + ttccs->xttc.base_addr + XTTCPS_CNT_CNTRL_OFFSET); err = clocksource_register_hz(&ttccs->cs, clk_get_rate(clk) / PRESCALE); if (WARN_ON(err)) @@ -244,7 +235,7 @@ static void __init zynq_ttc_setup_clocksource(struct device_node *np, static void __init zynq_ttc_setup_clockevent(struct device_node *np, void __iomem *base) { - struct xttcpss_timer_clockevent *ttcce; + struct xttcps_timer_clockevent *ttcce; int err, irq; u32 reg; @@ -272,17 +263,18 @@ static void __init zynq_ttc_setup_clockevent(struct device_node *np, ttcce->ce.name = np->name; ttcce->ce.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT; - ttcce->ce.set_next_event = xttcpss_set_next_event; - ttcce->ce.set_mode = xttcpss_set_mode; + ttcce->ce.set_next_event = xttcps_set_next_event; + ttcce->ce.set_mode = xttcps_set_mode; ttcce->ce.rating = 200; ttcce->ce.irq = irq; + ttcce->ce.cpumask = cpu_possible_mask; - __raw_writel(0x23, ttcce->xttc.base_addr + XTTCPSS_CNT_CNTRL_OFFSET); + __raw_writel(0x23, ttcce->xttc.base_addr + XTTCPS_CNT_CNTRL_OFFSET); __raw_writel(CLK_CNTRL_PRESCALE | CLK_CNTRL_PRESCALE_EN, - ttcce->xttc.base_addr + XTTCPSS_CLK_CNTRL_OFFSET); - __raw_writel(0x1, ttcce->xttc.base_addr + XTTCPSS_IER_OFFSET); + ttcce->xttc.base_addr + XTTCPS_CLK_CNTRL_OFFSET); + __raw_writel(0x1, ttcce->xttc.base_addr + XTTCPS_IER_OFFSET); - err = request_irq(irq, xttcpss_clock_event_interrupt, IRQF_TIMER, + err = request_irq(irq, xttcps_clock_event_interrupt, IRQF_TIMER, np->name, ttcce); if (WARN_ON(err)) return; @@ -301,12 +293,12 @@ static const __initconst struct of_device_id zynq_ttc_match[] = { }; /** - * xttcpss_timer_init - Initialize the timer + * xttcps_timer_init - Initialize the timer * * Initializes the timer hardware and register the clock source and clock event * timers with Linux kernal timer framework **/ -void __init xttcpss_timer_init(void) +void __init xttcps_timer_init(void) { struct device_node *np; 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