+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-
-#include <linux/clockchips.h>
-#include <linux/init.h>
-#include <asm/time.h>
-#include <asm/idle.h>
-#include <linux/interrupt.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
-#include <linux/sched_clock.h>
-
-#include <mach-rtl83xx.h>
-
-/*
- * Timer registers
- * the RTL9300/9310 SoCs have 6 timers, each register block 0x10 apart
- */
-#define RTL9300_TC_DATA 0x0
-#define RTL9300_TC_CNT 0x4
-#define RTL9300_TC_CTRL 0x8
-#define RTL9300_TC_CTRL_MODE BIT(24)
-#define RTL9300_TC_CTRL_EN BIT(28)
-#define RTL9300_TC_INT 0xc
-#define RTL9300_TC_INT_IP BIT(16)
-#define RTL9300_TC_INT_IE BIT(20)
-
-// Timer modes
-#define TIMER_MODE_REPEAT 1
-#define TIMER_MODE_ONCE 0
-
-// Minimum divider is 2
-#define DIVISOR_RTL9300 2
-
-#define N_BITS 28
-
-#define RTL9300_CLOCK_RATE 87500000
-
-struct rtl9300_clk_dev {
- struct clock_event_device clkdev;
- void __iomem *base;
-};
-
-static void __iomem *rtl9300_tc_base(struct clock_event_device *clk)
-{
- struct rtl9300_clk_dev *rtl_clk = container_of(clk, struct rtl9300_clk_dev, clkdev);
-
- return rtl_clk->base;
-}
-
-static irqreturn_t rtl9300_timer_interrupt(int irq, void *dev_id)
-{
- struct rtl9300_clk_dev *rtl_clk = dev_id;
- struct clock_event_device *clk = &rtl_clk->clkdev;
-
- u32 v = readl(rtl_clk->base + RTL9300_TC_INT);
-
- // Acknowledge the IRQ
- v |= RTL9300_TC_INT_IP;
- writel(v, rtl_clk->base + RTL9300_TC_INT);
-
- clk->event_handler(clk);
- return IRQ_HANDLED;
-}
-
-static void rtl9300_clock_stop(void __iomem *base)
-{
- u32 v;
-
- writel(0, base + RTL9300_TC_CTRL);
-
- // Acknowledge possibly pending IRQ
- v = readl(base + RTL9300_TC_INT);
- writel(v | RTL9300_TC_INT_IP, base + RTL9300_TC_INT);
-}
-
-static void rtl9300_timer_start(void __iomem *base, bool periodic)
-{
- u32 v = (periodic ? RTL9300_TC_CTRL_MODE : 0) | RTL9300_TC_CTRL_EN | DIVISOR_RTL9300;
-
- writel(0, base + RTL9300_TC_CNT);
- pr_debug("------------- starting timer base %08x\n", (u32)base);
- writel(v, base + RTL9300_TC_CTRL);
-}
-
-static int rtl9300_next_event(unsigned long delta, struct clock_event_device *clk)
-{
- void __iomem *base = rtl9300_tc_base(clk);
-
- rtl9300_clock_stop(base);
- writel(delta, base + RTL9300_TC_DATA);
- rtl9300_timer_start(base, TIMER_MODE_ONCE);
-
- return 0;
-}
-
-static int rtl9300_state_periodic(struct clock_event_device *clk)
-{
- void __iomem *base = rtl9300_tc_base(clk);
-
- pr_debug("------------- rtl9300_state_periodic %08x\n", (u32)base);
- rtl9300_clock_stop(base);
- writel(RTL9300_CLOCK_RATE / HZ, base + RTL9300_TC_DATA);
- rtl9300_timer_start(base, TIMER_MODE_REPEAT);
- return 0;
-}
-
-static int rtl9300_state_oneshot(struct clock_event_device *clk)
-{
- void __iomem *base = rtl9300_tc_base(clk);
-
- pr_debug("------------- rtl9300_state_oneshot %08x\n", (u32)base);
- rtl9300_clock_stop(base);
- writel(RTL9300_CLOCK_RATE / HZ, base + RTL9300_TC_DATA);
- rtl9300_timer_start(base, TIMER_MODE_ONCE);
- return 0;
-}
-
-static int rtl9300_shutdown(struct clock_event_device *clk)
-{
- void __iomem *base = rtl9300_tc_base(clk);
-
- pr_debug("------------- rtl9300_shutdown %08x\n", (u32)base);
- rtl9300_clock_stop(base);
- return 0;
-}
-
-static void rtl9300_clock_setup(void __iomem *base)
-{
- u32 v;
-
- // Disable timer
- writel(0, base + RTL9300_TC_CTRL);
-
- // Acknowledge possibly pending IRQ
- v = readl(base + RTL9300_TC_INT);
- writel(v | RTL9300_TC_INT_IP, base + RTL9300_TC_INT);
-
- // Setup maximum period (for use as clock-source)
- writel(0x0fffffff, base + RTL9300_TC_DATA);
-}
-
-static DEFINE_PER_CPU(struct rtl9300_clk_dev, rtl9300_clockevent);
-static DEFINE_PER_CPU(char [18], rtl9300_clock_name);
-
-void rtl9300_clockevent_init(void)
-{
- int cpu = smp_processor_id();
- int irq;
- struct rtl9300_clk_dev *rtl_clk = &per_cpu(rtl9300_clockevent, cpu);
- struct clock_event_device *cd = &rtl_clk->clkdev;
- unsigned char *name = per_cpu(rtl9300_clock_name, cpu);
- unsigned long flags = IRQF_PERCPU | IRQF_TIMER;
- struct device_node *node;
-
- pr_info("%s called for cpu%d\n", __func__, cpu);
- BUG_ON(cpu > 3); /* Only have 4 general purpose timers */
-
- node = of_find_compatible_node(NULL, NULL, "realtek,rtl9300clock");
- if (!node) {
- pr_err("No DT entry found for realtek,rtl9300clock\n");
- return;
- }
-
- irq = irq_of_parse_and_map(node, cpu);
- pr_info("%s using IRQ %d\n", __func__, irq);
-
- rtl_clk->base = of_iomap(node, cpu);
- if (!rtl_clk->base) {
- pr_err("cannot map timer for cpu %d", cpu);
- return;
- }
-
- rtl9300_clock_setup(rtl_clk->base);
-
- sprintf(name, "rtl9300-counter-%d", cpu);
- cd->name = name;
- cd->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;
-
- clockevent_set_clock(cd, RTL9300_CLOCK_RATE);
-
- cd->max_delta_ns = clockevent_delta2ns(0x0fffffff, cd);
- cd->max_delta_ticks = 0x0fffffff;
- cd->min_delta_ns = clockevent_delta2ns(0x20, cd);
- cd->min_delta_ticks = 0x20;
- cd->rating = 300;
- cd->irq = irq;
- cd->cpumask = cpumask_of(cpu);
- cd->set_next_event = rtl9300_next_event;
- cd->set_state_shutdown = rtl9300_shutdown;
- cd->set_state_periodic = rtl9300_state_periodic;
- cd->set_state_oneshot = rtl9300_state_oneshot;
- clockevents_register_device(cd);
-
- irq_set_affinity(irq, cd->cpumask);
-
- if (request_irq(irq, rtl9300_timer_interrupt, flags, name, rtl_clk))
- pr_err("Failed to request irq %d (%s)\n", irq, name);
-
- writel(RTL9300_TC_INT_IE, rtl_clk->base + RTL9300_TC_INT);
-}
projects / openwrt / staging / ldir.git / blobdiff