From e8dd273d199f5bbe295a8e3d8b777c5505b6b2e1 Mon Sep 17 00:00:00 2001 From: Salah Triki Date: Thu, 17 Sep 2026 14:00:52 +0100 Subject: iio: proximity: isl29501: Fix return type of isl29501_register_write isl29501_register_write() was returning a u32 instead of an int. Since the function returns negative error codes (such as -ERANGE or return values from i2c_smbus_write_byte_data()), returning an unsigned integer type prevents callers from correctly checking for negative error conditions. Fix this by changing the function return type from u32 to int. This was found through manual code review. Fixes: 1c28799257bc ("iio: light: isl29501: Add support for the ISL29501 ToF sensor.") Signed-off-by: Salah Triki Reviewed-by: Joshua Crofts Cc: stable@vger.kernel.org Signed-off-by: Jonathan Cameron --- drivers/clocksource/mps2-timer.c | 273 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 273 insertions(+) create mode 100644 drivers/clocksource/mps2-timer.c (limited to 'drivers/clocksource/mps2-timer.c') diff --git a/drivers/clocksource/mps2-timer.c b/drivers/clocksource/mps2-timer.c new file mode 100644 index 000000000..ebca55d8c --- /dev/null +++ b/drivers/clocksource/mps2-timer.c @@ -0,0 +1,273 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2015 ARM Limited + * + * Author: Vladimir Murzin + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define TIMER_CTRL 0x0 +#define TIMER_CTRL_ENABLE BIT(0) +#define TIMER_CTRL_IE BIT(3) + +#define TIMER_VALUE 0x4 +#define TIMER_RELOAD 0x8 +#define TIMER_INT 0xc + +struct clockevent_mps2 { + void __iomem *reg; + u32 clock_count_per_tick; + struct clock_event_device clkevt; +}; + +static void __iomem *sched_clock_base; + +static u64 notrace mps2_sched_read(void) +{ + return ~readl_relaxed(sched_clock_base + TIMER_VALUE); +} + +static inline struct clockevent_mps2 *to_mps2_clkevt(struct clock_event_device *c) +{ + return container_of(c, struct clockevent_mps2, clkevt); +} + +static void clockevent_mps2_writel(u32 val, struct clock_event_device *c, u32 offset) +{ + writel_relaxed(val, to_mps2_clkevt(c)->reg + offset); +} + +static int mps2_timer_shutdown(struct clock_event_device *ce) +{ + clockevent_mps2_writel(0, ce, TIMER_RELOAD); + clockevent_mps2_writel(0, ce, TIMER_CTRL); + + return 0; +} + +static int mps2_timer_set_next_event(unsigned long next, struct clock_event_device *ce) +{ + clockevent_mps2_writel(next, ce, TIMER_VALUE); + clockevent_mps2_writel(TIMER_CTRL_IE | TIMER_CTRL_ENABLE, ce, TIMER_CTRL); + + return 0; +} + +static int mps2_timer_set_periodic(struct clock_event_device *ce) +{ + u32 clock_count_per_tick = to_mps2_clkevt(ce)->clock_count_per_tick; + + clockevent_mps2_writel(clock_count_per_tick, ce, TIMER_RELOAD); + clockevent_mps2_writel(clock_count_per_tick, ce, TIMER_VALUE); + clockevent_mps2_writel(TIMER_CTRL_IE | TIMER_CTRL_ENABLE, ce, TIMER_CTRL); + + return 0; +} + +static irqreturn_t mps2_timer_interrupt(int irq, void *dev_id) +{ + struct clockevent_mps2 *ce = dev_id; + u32 status = readl_relaxed(ce->reg + TIMER_INT); + + if (!status) { + pr_warn("spurious interrupt\n"); + return IRQ_NONE; + } + + writel_relaxed(1, ce->reg + TIMER_INT); + + ce->clkevt.event_handler(&ce->clkevt); + + return IRQ_HANDLED; +} + +static int __init mps2_clockevent_init(struct device_node *np) +{ + void __iomem *base; + struct clk *clk = NULL; + struct clockevent_mps2 *ce; + u32 rate; + int irq, ret; + const char *name = "mps2-clkevt"; + + ret = of_property_read_u32(np, "clock-frequency", &rate); + if (ret) { + clk = of_clk_get(np, 0); + if (IS_ERR(clk)) { + ret = PTR_ERR(clk); + pr_err("failed to get clock for clockevent: %d\n", ret); + goto out; + } + + ret = clk_prepare_enable(clk); + if (ret) { + pr_err("failed to enable clock for clockevent: %d\n", ret); + goto out_clk_put; + } + + rate = clk_get_rate(clk); + } + + base = of_iomap(np, 0); + if (!base) { + ret = -EADDRNOTAVAIL; + pr_err("failed to map register for clockevent: %d\n", ret); + goto out_clk_disable; + } + + irq = irq_of_parse_and_map(np, 0); + if (!irq) { + ret = -ENOENT; + pr_err("failed to get irq for clockevent: %d\n", ret); + goto out_iounmap; + } + + ce = kzalloc_obj(*ce); + if (!ce) { + ret = -ENOMEM; + goto out_iounmap; + } + + ce->reg = base; + ce->clock_count_per_tick = DIV_ROUND_CLOSEST(rate, HZ); + ce->clkevt.irq = irq; + ce->clkevt.name = name; + ce->clkevt.rating = 200; + ce->clkevt.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT; + ce->clkevt.cpumask = cpu_possible_mask; + ce->clkevt.set_state_shutdown = mps2_timer_shutdown; + ce->clkevt.set_state_periodic = mps2_timer_set_periodic; + ce->clkevt.set_state_oneshot = mps2_timer_shutdown; + ce->clkevt.set_next_event = mps2_timer_set_next_event; + + /* Ensure timer is disabled */ + writel_relaxed(0, base + TIMER_CTRL); + + ret = request_irq(irq, mps2_timer_interrupt, IRQF_TIMER, name, ce); + if (ret) { + pr_err("failed to request irq for clockevent: %d\n", ret); + goto out_kfree; + } + + clockevents_config_and_register(&ce->clkevt, rate, 0xf, 0xffffffff); + + return 0; + +out_kfree: + kfree(ce); +out_iounmap: + iounmap(base); +out_clk_disable: + /* clk_{disable, unprepare, put}() can handle NULL as a parameter */ + clk_disable_unprepare(clk); +out_clk_put: + clk_put(clk); +out: + return ret; +} + +static int __init mps2_clocksource_init(struct device_node *np) +{ + void __iomem *base; + struct clk *clk = NULL; + u32 rate; + int ret; + const char *name = "mps2-clksrc"; + + ret = of_property_read_u32(np, "clock-frequency", &rate); + if (ret) { + clk = of_clk_get(np, 0); + if (IS_ERR(clk)) { + ret = PTR_ERR(clk); + pr_err("failed to get clock for clocksource: %d\n", ret); + goto out; + } + + ret = clk_prepare_enable(clk); + if (ret) { + pr_err("failed to enable clock for clocksource: %d\n", ret); + goto out_clk_put; + } + + rate = clk_get_rate(clk); + } + + base = of_iomap(np, 0); + if (!base) { + ret = -EADDRNOTAVAIL; + pr_err("failed to map register for clocksource: %d\n", ret); + goto out_clk_disable; + } + + /* Ensure timer is disabled */ + writel_relaxed(0, base + TIMER_CTRL); + + /* ... and set it up as free-running clocksource */ + writel_relaxed(0xffffffff, base + TIMER_VALUE); + writel_relaxed(0xffffffff, base + TIMER_RELOAD); + + writel_relaxed(TIMER_CTRL_ENABLE, base + TIMER_CTRL); + + ret = clocksource_mmio_init(base + TIMER_VALUE, name, + rate, 200, 32, + clocksource_mmio_readl_down); + if (ret) { + pr_err("failed to init clocksource: %d\n", ret); + goto out_iounmap; + } + + sched_clock_base = base; + sched_clock_register(mps2_sched_read, 32, rate); + + return 0; + +out_iounmap: + iounmap(base); +out_clk_disable: + /* clk_{disable, unprepare, put}() can handle NULL as a parameter */ + clk_disable_unprepare(clk); +out_clk_put: + clk_put(clk); +out: + return ret; +} + +static int __init mps2_timer_init(struct device_node *np) +{ + static int has_clocksource, has_clockevent; + int ret; + + if (!has_clocksource) { + ret = mps2_clocksource_init(np); + if (!ret) { + has_clocksource = 1; + return 0; + } + } + + if (!has_clockevent) { + ret = mps2_clockevent_init(np); + if (!ret) { + has_clockevent = 1; + return 0; + } + } + + return 0; +} + +TIMER_OF_DECLARE(mps2_timer, "arm,mps2-timer", mps2_timer_init); -- cgit v1.3.1