558 lines
12 KiB
C
558 lines
12 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* MPIC timer driver
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*
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* Copyright 2013 Freescale Semiconductor, Inc.
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* Author: Dongsheng Wang <Dongsheng.Wang@freescale.com>
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* Li Yang <leoli@freescale.com>
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_device.h>
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#include <linux/of_irq.h>
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#include <linux/syscore_ops.h>
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#include <sysdev/fsl_soc.h>
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#include <asm/io.h>
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#include <asm/mpic_timer.h>
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#define FSL_GLOBAL_TIMER 0x1
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/* Clock Ratio
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* Divide by 64 0x00000300
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* Divide by 32 0x00000200
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* Divide by 16 0x00000100
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* Divide by 8 0x00000000 (Hardware default div)
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*/
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#define MPIC_TIMER_TCR_CLKDIV 0x00000300
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#define MPIC_TIMER_TCR_ROVR_OFFSET 24
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#define TIMER_STOP 0x80000000
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#define GTCCR_TOG 0x80000000
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#define TIMERS_PER_GROUP 4
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#define MAX_TICKS (~0U >> 1)
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#define MAX_TICKS_CASCADE (~0U)
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#define TIMER_OFFSET(num) (1 << (TIMERS_PER_GROUP - 1 - num))
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struct timer_regs {
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u32 gtccr;
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u32 res0[3];
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u32 gtbcr;
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u32 res1[3];
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u32 gtvpr;
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u32 res2[3];
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u32 gtdr;
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u32 res3[3];
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};
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struct cascade_priv {
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u32 tcr_value; /* TCR register: CASC & ROVR value */
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unsigned int cascade_map; /* cascade map */
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unsigned int timer_num; /* cascade control timer */
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};
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struct timer_group_priv {
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struct timer_regs __iomem *regs;
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struct mpic_timer timer[TIMERS_PER_GROUP];
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struct list_head node;
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unsigned int timerfreq;
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unsigned int idle;
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unsigned int flags;
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spinlock_t lock;
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void __iomem *group_tcr;
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};
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static struct cascade_priv cascade_timer[] = {
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/* cascade timer 0 and 1 */
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{0x1, 0xc, 0x1},
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/* cascade timer 1 and 2 */
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{0x2, 0x6, 0x2},
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/* cascade timer 2 and 3 */
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{0x4, 0x3, 0x3}
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};
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static LIST_HEAD(timer_group_list);
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static void convert_ticks_to_time(struct timer_group_priv *priv,
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const u64 ticks, time64_t *time)
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{
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*time = (u64)div_u64(ticks, priv->timerfreq);
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}
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/* the time set by the user is converted to "ticks" */
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static int convert_time_to_ticks(struct timer_group_priv *priv,
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time64_t time, u64 *ticks)
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{
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u64 max_value; /* prevent u64 overflow */
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max_value = div_u64(ULLONG_MAX, priv->timerfreq);
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if (time > max_value)
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return -EINVAL;
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*ticks = (u64)time * (u64)priv->timerfreq;
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return 0;
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}
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/* detect whether there is a cascade timer available */
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static struct mpic_timer *detect_idle_cascade_timer(
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struct timer_group_priv *priv)
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{
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struct cascade_priv *casc_priv;
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unsigned int map;
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unsigned int array_size = ARRAY_SIZE(cascade_timer);
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unsigned int num;
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unsigned int i;
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unsigned long flags;
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casc_priv = cascade_timer;
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for (i = 0; i < array_size; i++) {
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spin_lock_irqsave(&priv->lock, flags);
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map = casc_priv->cascade_map & priv->idle;
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if (map == casc_priv->cascade_map) {
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num = casc_priv->timer_num;
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priv->timer[num].cascade_handle = casc_priv;
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/* set timer busy */
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priv->idle &= ~casc_priv->cascade_map;
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spin_unlock_irqrestore(&priv->lock, flags);
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return &priv->timer[num];
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}
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spin_unlock_irqrestore(&priv->lock, flags);
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casc_priv++;
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}
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return NULL;
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}
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static int set_cascade_timer(struct timer_group_priv *priv, u64 ticks,
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unsigned int num)
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{
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struct cascade_priv *casc_priv;
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u32 tcr;
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u32 tmp_ticks;
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u32 rem_ticks;
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/* set group tcr reg for cascade */
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casc_priv = priv->timer[num].cascade_handle;
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if (!casc_priv)
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return -EINVAL;
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tcr = casc_priv->tcr_value |
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(casc_priv->tcr_value << MPIC_TIMER_TCR_ROVR_OFFSET);
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setbits32(priv->group_tcr, tcr);
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tmp_ticks = div_u64_rem(ticks, MAX_TICKS_CASCADE, &rem_ticks);
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out_be32(&priv->regs[num].gtccr, 0);
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out_be32(&priv->regs[num].gtbcr, tmp_ticks | TIMER_STOP);
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out_be32(&priv->regs[num - 1].gtccr, 0);
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out_be32(&priv->regs[num - 1].gtbcr, rem_ticks);
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return 0;
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}
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static struct mpic_timer *get_cascade_timer(struct timer_group_priv *priv,
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u64 ticks)
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{
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struct mpic_timer *allocated_timer;
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/* Two cascade timers: Support the maximum time */
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const u64 max_ticks = (u64)MAX_TICKS * (u64)MAX_TICKS_CASCADE;
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int ret;
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if (ticks > max_ticks)
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return NULL;
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/* detect idle timer */
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allocated_timer = detect_idle_cascade_timer(priv);
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if (!allocated_timer)
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return NULL;
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/* set ticks to timer */
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ret = set_cascade_timer(priv, ticks, allocated_timer->num);
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if (ret < 0)
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return NULL;
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return allocated_timer;
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}
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static struct mpic_timer *get_timer(time64_t time)
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{
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struct timer_group_priv *priv;
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struct mpic_timer *timer;
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u64 ticks;
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unsigned int num;
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unsigned int i;
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unsigned long flags;
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int ret;
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list_for_each_entry(priv, &timer_group_list, node) {
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ret = convert_time_to_ticks(priv, time, &ticks);
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if (ret < 0)
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return NULL;
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if (ticks > MAX_TICKS) {
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if (!(priv->flags & FSL_GLOBAL_TIMER))
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return NULL;
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timer = get_cascade_timer(priv, ticks);
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if (!timer)
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continue;
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return timer;
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}
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for (i = 0; i < TIMERS_PER_GROUP; i++) {
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/* one timer: Reverse allocation */
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num = TIMERS_PER_GROUP - 1 - i;
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spin_lock_irqsave(&priv->lock, flags);
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if (priv->idle & (1 << i)) {
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/* set timer busy */
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priv->idle &= ~(1 << i);
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/* set ticks & stop timer */
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out_be32(&priv->regs[num].gtbcr,
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ticks | TIMER_STOP);
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out_be32(&priv->regs[num].gtccr, 0);
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priv->timer[num].cascade_handle = NULL;
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spin_unlock_irqrestore(&priv->lock, flags);
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return &priv->timer[num];
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}
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spin_unlock_irqrestore(&priv->lock, flags);
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}
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}
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return NULL;
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}
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/**
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* mpic_start_timer - start hardware timer
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* @handle: the timer to be started.
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*
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* It will do ->fn(->dev) callback from the hardware interrupt at
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* the 'time64_t' point in the future.
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*/
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void mpic_start_timer(struct mpic_timer *handle)
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{
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struct timer_group_priv *priv = container_of(handle,
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struct timer_group_priv, timer[handle->num]);
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clrbits32(&priv->regs[handle->num].gtbcr, TIMER_STOP);
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}
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EXPORT_SYMBOL(mpic_start_timer);
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/**
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* mpic_stop_timer - stop hardware timer
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* @handle: the timer to be stoped
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*
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* The timer periodically generates an interrupt. Unless user stops the timer.
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*/
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void mpic_stop_timer(struct mpic_timer *handle)
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{
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struct timer_group_priv *priv = container_of(handle,
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struct timer_group_priv, timer[handle->num]);
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struct cascade_priv *casc_priv;
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setbits32(&priv->regs[handle->num].gtbcr, TIMER_STOP);
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casc_priv = priv->timer[handle->num].cascade_handle;
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if (casc_priv) {
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out_be32(&priv->regs[handle->num].gtccr, 0);
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out_be32(&priv->regs[handle->num - 1].gtccr, 0);
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} else {
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out_be32(&priv->regs[handle->num].gtccr, 0);
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}
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}
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EXPORT_SYMBOL(mpic_stop_timer);
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/**
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* mpic_get_remain_time - get timer time
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* @handle: the timer to be selected.
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* @time: time for timer
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*
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* Query timer remaining time.
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*/
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void mpic_get_remain_time(struct mpic_timer *handle, time64_t *time)
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{
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struct timer_group_priv *priv = container_of(handle,
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struct timer_group_priv, timer[handle->num]);
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struct cascade_priv *casc_priv;
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u64 ticks;
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u32 tmp_ticks;
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casc_priv = priv->timer[handle->num].cascade_handle;
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if (casc_priv) {
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tmp_ticks = in_be32(&priv->regs[handle->num].gtccr);
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tmp_ticks &= ~GTCCR_TOG;
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ticks = ((u64)tmp_ticks & UINT_MAX) * (u64)MAX_TICKS_CASCADE;
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tmp_ticks = in_be32(&priv->regs[handle->num - 1].gtccr);
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ticks += tmp_ticks;
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} else {
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ticks = in_be32(&priv->regs[handle->num].gtccr);
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ticks &= ~GTCCR_TOG;
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}
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convert_ticks_to_time(priv, ticks, time);
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}
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EXPORT_SYMBOL(mpic_get_remain_time);
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/**
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* mpic_free_timer - free hardware timer
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* @handle: the timer to be removed.
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*
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* Free the timer.
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*
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* Note: can not be used in interrupt context.
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*/
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void mpic_free_timer(struct mpic_timer *handle)
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{
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struct timer_group_priv *priv = container_of(handle,
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struct timer_group_priv, timer[handle->num]);
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struct cascade_priv *casc_priv;
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unsigned long flags;
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mpic_stop_timer(handle);
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casc_priv = priv->timer[handle->num].cascade_handle;
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free_irq(priv->timer[handle->num].irq, priv->timer[handle->num].dev);
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spin_lock_irqsave(&priv->lock, flags);
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if (casc_priv) {
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u32 tcr;
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tcr = casc_priv->tcr_value | (casc_priv->tcr_value <<
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MPIC_TIMER_TCR_ROVR_OFFSET);
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clrbits32(priv->group_tcr, tcr);
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priv->idle |= casc_priv->cascade_map;
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priv->timer[handle->num].cascade_handle = NULL;
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} else {
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priv->idle |= TIMER_OFFSET(handle->num);
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}
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spin_unlock_irqrestore(&priv->lock, flags);
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}
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EXPORT_SYMBOL(mpic_free_timer);
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/**
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* mpic_request_timer - get a hardware timer
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* @fn: interrupt handler function
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* @dev: callback function of the data
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* @time: time for timer
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*
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* This executes the "request_irq", returning NULL
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* else "handle" on success.
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*/
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struct mpic_timer *mpic_request_timer(irq_handler_t fn, void *dev,
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time64_t time)
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{
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struct mpic_timer *allocated_timer;
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int ret;
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if (list_empty(&timer_group_list))
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return NULL;
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if (time < 0)
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return NULL;
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allocated_timer = get_timer(time);
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if (!allocated_timer)
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return NULL;
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ret = request_irq(allocated_timer->irq, fn,
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IRQF_TRIGGER_LOW, "global-timer", dev);
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if (ret) {
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mpic_free_timer(allocated_timer);
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return NULL;
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}
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||
|
|
allocated_timer->dev = dev;
|
||
|
|
|
||
|
|
return allocated_timer;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(mpic_request_timer);
|
||
|
|
|
||
|
|
static int __init timer_group_get_freq(struct device_node *np,
|
||
|
|
struct timer_group_priv *priv)
|
||
|
|
{
|
||
|
|
u32 div;
|
||
|
|
|
||
|
|
if (priv->flags & FSL_GLOBAL_TIMER) {
|
||
|
|
struct device_node *dn;
|
||
|
|
|
||
|
|
dn = of_find_compatible_node(NULL, NULL, "fsl,mpic");
|
||
|
|
if (dn) {
|
||
|
|
of_property_read_u32(dn, "clock-frequency",
|
||
|
|
&priv->timerfreq);
|
||
|
|
of_node_put(dn);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (priv->timerfreq <= 0)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
if (priv->flags & FSL_GLOBAL_TIMER) {
|
||
|
|
div = (1 << (MPIC_TIMER_TCR_CLKDIV >> 8)) * 8;
|
||
|
|
priv->timerfreq /= div;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int __init timer_group_get_irq(struct device_node *np,
|
||
|
|
struct timer_group_priv *priv)
|
||
|
|
{
|
||
|
|
const u32 all_timer[] = { 0, TIMERS_PER_GROUP };
|
||
|
|
const u32 *p;
|
||
|
|
u32 offset;
|
||
|
|
u32 count;
|
||
|
|
|
||
|
|
unsigned int i;
|
||
|
|
unsigned int j;
|
||
|
|
unsigned int irq_index = 0;
|
||
|
|
unsigned int irq;
|
||
|
|
int len;
|
||
|
|
|
||
|
|
p = of_get_property(np, "fsl,available-ranges", &len);
|
||
|
|
if (p && len % (2 * sizeof(u32)) != 0) {
|
||
|
|
pr_err("%pOF: malformed available-ranges property.\n", np);
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!p) {
|
||
|
|
p = all_timer;
|
||
|
|
len = sizeof(all_timer);
|
||
|
|
}
|
||
|
|
|
||
|
|
len /= 2 * sizeof(u32);
|
||
|
|
|
||
|
|
for (i = 0; i < len; i++) {
|
||
|
|
offset = p[i * 2];
|
||
|
|
count = p[i * 2 + 1];
|
||
|
|
for (j = 0; j < count; j++) {
|
||
|
|
irq = irq_of_parse_and_map(np, irq_index);
|
||
|
|
if (!irq) {
|
||
|
|
pr_err("%pOF: irq parse and map failed.\n", np);
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Set timer idle */
|
||
|
|
priv->idle |= TIMER_OFFSET((offset + j));
|
||
|
|
priv->timer[offset + j].irq = irq;
|
||
|
|
priv->timer[offset + j].num = offset + j;
|
||
|
|
irq_index++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __init timer_group_init(struct device_node *np)
|
||
|
|
{
|
||
|
|
struct timer_group_priv *priv;
|
||
|
|
unsigned int i = 0;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
priv = kzalloc(sizeof(struct timer_group_priv), GFP_KERNEL);
|
||
|
|
if (!priv) {
|
||
|
|
pr_err("%pOF: cannot allocate memory for group.\n", np);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (of_device_is_compatible(np, "fsl,mpic-global-timer"))
|
||
|
|
priv->flags |= FSL_GLOBAL_TIMER;
|
||
|
|
|
||
|
|
priv->regs = of_iomap(np, i++);
|
||
|
|
if (!priv->regs) {
|
||
|
|
pr_err("%pOF: cannot ioremap timer register address.\n", np);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (priv->flags & FSL_GLOBAL_TIMER) {
|
||
|
|
priv->group_tcr = of_iomap(np, i++);
|
||
|
|
if (!priv->group_tcr) {
|
||
|
|
pr_err("%pOF: cannot ioremap tcr address.\n", np);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = timer_group_get_freq(np, priv);
|
||
|
|
if (ret < 0) {
|
||
|
|
pr_err("%pOF: cannot get timer frequency.\n", np);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = timer_group_get_irq(np, priv);
|
||
|
|
if (ret < 0) {
|
||
|
|
pr_err("%pOF: cannot get timer irqs.\n", np);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
spin_lock_init(&priv->lock);
|
||
|
|
|
||
|
|
/* Init FSL timer hardware */
|
||
|
|
if (priv->flags & FSL_GLOBAL_TIMER)
|
||
|
|
setbits32(priv->group_tcr, MPIC_TIMER_TCR_CLKDIV);
|
||
|
|
|
||
|
|
list_add_tail(&priv->node, &timer_group_list);
|
||
|
|
|
||
|
|
return;
|
||
|
|
|
||
|
|
out:
|
||
|
|
if (priv->regs)
|
||
|
|
iounmap(priv->regs);
|
||
|
|
|
||
|
|
if (priv->group_tcr)
|
||
|
|
iounmap(priv->group_tcr);
|
||
|
|
|
||
|
|
kfree(priv);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void mpic_timer_resume(void)
|
||
|
|
{
|
||
|
|
struct timer_group_priv *priv;
|
||
|
|
|
||
|
|
list_for_each_entry(priv, &timer_group_list, node) {
|
||
|
|
/* Init FSL timer hardware */
|
||
|
|
if (priv->flags & FSL_GLOBAL_TIMER)
|
||
|
|
setbits32(priv->group_tcr, MPIC_TIMER_TCR_CLKDIV);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct of_device_id mpic_timer_ids[] = {
|
||
|
|
{ .compatible = "fsl,mpic-global-timer", },
|
||
|
|
{},
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct syscore_ops mpic_timer_syscore_ops = {
|
||
|
|
.resume = mpic_timer_resume,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int __init mpic_timer_init(void)
|
||
|
|
{
|
||
|
|
struct device_node *np = NULL;
|
||
|
|
|
||
|
|
for_each_matching_node(np, mpic_timer_ids)
|
||
|
|
timer_group_init(np);
|
||
|
|
|
||
|
|
register_syscore_ops(&mpic_timer_syscore_ops);
|
||
|
|
|
||
|
|
if (list_empty(&timer_group_list))
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
subsys_initcall(mpic_timer_init);
|