diff options
Diffstat (limited to 'drivers/clocksource/timer-imx-sysctr.c')
| -rw-r--r-- | drivers/clocksource/timer-imx-sysctr.c | 117 |
1 files changed, 87 insertions, 30 deletions
diff --git a/drivers/clocksource/timer-imx-sysctr.c b/drivers/clocksource/timer-imx-sysctr.c index 5a7a951c4efcdf..44525813be1e28 100644 --- a/drivers/clocksource/timer-imx-sysctr.c +++ b/drivers/clocksource/timer-imx-sysctr.c @@ -4,48 +4,62 @@ #include <linux/interrupt.h> #include <linux/clockchips.h> +#include <linux/slab.h> #include "timer-of.h" #define CMP_OFFSET 0x10000 +#define RD_OFFSET 0x20000 #define CNTCV_LO 0x8 #define CNTCV_HI 0xc #define CMPCV_LO (CMP_OFFSET + 0x20) #define CMPCV_HI (CMP_OFFSET + 0x24) #define CMPCR (CMP_OFFSET + 0x2c) +#define CNTCV_LO_IMX95 (RD_OFFSET + 0x8) +#define CNTCV_HI_IMX95 (RD_OFFSET + 0xc) #define SYS_CTR_EN 0x1 #define SYS_CTR_IRQ_MASK 0x2 #define SYS_CTR_CLK_DIV 0x3 -static void __iomem *sys_ctr_base __ro_after_init; -static u32 cmpcr __ro_after_init; +struct sysctr_private { + u32 cmpcr; + u32 lo_off; + u32 hi_off; +}; -static void sysctr_timer_enable(bool enable) +static void sysctr_timer_enable(struct clock_event_device *evt, bool enable) { - writel(enable ? cmpcr | SYS_CTR_EN : cmpcr, sys_ctr_base + CMPCR); + struct timer_of *to = to_timer_of(evt); + struct sysctr_private *priv = to->private_data; + void __iomem *base = timer_of_base(to); + + writel(enable ? priv->cmpcr | SYS_CTR_EN : priv->cmpcr, base + CMPCR); } -static void sysctr_irq_acknowledge(void) +static void sysctr_irq_acknowledge(struct clock_event_device *evt) { /* * clear the enable bit(EN =0) will clear * the status bit(ISTAT = 0), then the interrupt * signal will be negated(acknowledged). */ - sysctr_timer_enable(false); + sysctr_timer_enable(evt, false); } -static inline u64 sysctr_read_counter(void) +static inline u64 sysctr_read_counter(struct clock_event_device *evt) { + struct timer_of *to = to_timer_of(evt); + struct sysctr_private *priv = to->private_data; + void __iomem *base = timer_of_base(to); u32 cnt_hi, tmp_hi, cnt_lo; do { - cnt_hi = readl_relaxed(sys_ctr_base + CNTCV_HI); - cnt_lo = readl_relaxed(sys_ctr_base + CNTCV_LO); - tmp_hi = readl_relaxed(sys_ctr_base + CNTCV_HI); + cnt_hi = readl_relaxed(base + priv->hi_off); + cnt_lo = readl_relaxed(base + priv->lo_off); + tmp_hi = readl_relaxed(base + priv->hi_off); } while (tmp_hi != cnt_hi); return ((u64) cnt_hi << 32) | cnt_lo; @@ -54,22 +68,24 @@ static inline u64 sysctr_read_counter(void) static int sysctr_set_next_event(unsigned long delta, struct clock_event_device *evt) { + struct timer_of *to = to_timer_of(evt); + void __iomem *base = timer_of_base(to); u32 cmp_hi, cmp_lo; u64 next; - sysctr_timer_enable(false); + sysctr_timer_enable(evt, false); - next = sysctr_read_counter(); + next = sysctr_read_counter(evt); next += delta; cmp_hi = (next >> 32) & 0x00fffff; cmp_lo = next & 0xffffffff; - writel_relaxed(cmp_hi, sys_ctr_base + CMPCV_HI); - writel_relaxed(cmp_lo, sys_ctr_base + CMPCV_LO); + writel_relaxed(cmp_hi, base + CMPCV_HI); + writel_relaxed(cmp_lo, base + CMPCV_LO); - sysctr_timer_enable(true); + sysctr_timer_enable(evt, true); return 0; } @@ -81,7 +97,7 @@ static int sysctr_set_state_oneshot(struct clock_event_device *evt) static int sysctr_set_state_shutdown(struct clock_event_device *evt) { - sysctr_timer_enable(false); + sysctr_timer_enable(evt, false); return 0; } @@ -90,7 +106,7 @@ static irqreturn_t sysctr_timer_interrupt(int irq, void *dev_id) { struct clock_event_device *evt = dev_id; - sysctr_irq_acknowledge(); + sysctr_irq_acknowledge(evt); evt->event_handler(evt); @@ -117,34 +133,75 @@ static struct timer_of to_sysctr = { }, }; -static void __init sysctr_clockevent_init(void) +static int __init __sysctr_timer_init(struct device_node *np) { + struct sysctr_private *priv; + void __iomem *base; + int ret; + + priv = kzalloc(sizeof(struct sysctr_private), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + ret = timer_of_init(np, &to_sysctr); + if (ret) { + kfree(priv); + return ret; + } + + if (!of_property_read_bool(np, "nxp,no-divider")) { + /* system counter clock is divided by 3 internally */ + to_sysctr.of_clk.rate /= SYS_CTR_CLK_DIV; + } + to_sysctr.clkevt.cpumask = cpu_possible_mask; + to_sysctr.private_data = priv; + + base = timer_of_base(&to_sysctr); + priv->cmpcr = readl(base + CMPCR) & ~SYS_CTR_EN; + + return 0; +} + +static int __init sysctr_timer_init(struct device_node *np) +{ + struct sysctr_private *priv; + int ret; + + ret = __sysctr_timer_init(np); + if (ret) + return ret; + + priv = to_sysctr.private_data; + priv->lo_off = CNTCV_LO; + priv->hi_off = CNTCV_HI; clockevents_config_and_register(&to_sysctr.clkevt, timer_of_rate(&to_sysctr), 0xff, 0x7fffffff); + + return 0; } -static int __init sysctr_timer_init(struct device_node *np) +static int __init sysctr_timer_imx95_init(struct device_node *np) { - int ret = 0; + struct sysctr_private *priv; + int ret; - ret = timer_of_init(np, &to_sysctr); + ret = __sysctr_timer_init(np); if (ret) return ret; - if (!of_property_read_bool(np, "nxp,no-divider")) { - /* system counter clock is divided by 3 internally */ - to_sysctr.of_clk.rate /= SYS_CTR_CLK_DIV; - } - - sys_ctr_base = timer_of_base(&to_sysctr); - cmpcr = readl(sys_ctr_base + CMPCR); - cmpcr &= ~SYS_CTR_EN; + priv = to_sysctr.private_data; + priv->lo_off = CNTCV_LO_IMX95; + priv->hi_off = CNTCV_HI_IMX95; - sysctr_clockevent_init(); + clockevents_config_and_register(&to_sysctr.clkevt, + timer_of_rate(&to_sysctr), + 0xff, 0x7fffffff); return 0; } + TIMER_OF_DECLARE(sysctr_timer, "nxp,sysctr-timer", sysctr_timer_init); +TIMER_OF_DECLARE(sysctr_timer_imx95, "nxp,imx95-sysctr-timer", sysctr_timer_imx95_init); |