+++ /dev/null
-/*
- * Copyright (c) 2016, Mellanox Technologies. All rights reserved.
- *
- * This software is available to you under a choice of one of two
- * licenses. You may choose to be licensed under the terms of the GNU
- * General Public License (GPL) Version 2, available from the file
- * COPYING in the main directory of this source tree, or the
- * OpenIB.org BSD license below:
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above
- * copyright notice, this list of conditions and the following
- * disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials
- * provided with the distribution.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
- * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
- * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-#include <linux/interrupt.h>
-#include <linux/clocksource.h>
-#include <linux/clockchips.h>
-#include <linux/clk.h>
-#include <linux/of.h>
-#include <linux/of_irq.h>
-#include <linux/cpu.h>
-#include <soc/nps/common.h>
-
-#define NPS_MSU_TICK_LOW 0xC8
-#define NPS_CLUSTER_OFFSET 8
-#define NPS_CLUSTER_NUM 16
-
-/* This array is per cluster of CPUs (Each NPS400 cluster got 256 CPUs) */
-static void *nps_msu_reg_low_addr[NPS_CLUSTER_NUM] __read_mostly;
-
-static int __init nps_get_timer_clk(struct device_node *node,
- unsigned long *timer_freq,
- struct clk **clk)
-{
- int ret;
-
- *clk = of_clk_get(node, 0);
- ret = PTR_ERR_OR_ZERO(*clk);
- if (ret) {
- pr_err("timer missing clk\n");
- return ret;
- }
-
- ret = clk_prepare_enable(*clk);
- if (ret) {
- pr_err("Couldn't enable parent clk\n");
- clk_put(*clk);
- return ret;
- }
-
- *timer_freq = clk_get_rate(*clk);
- if (!(*timer_freq)) {
- pr_err("Couldn't get clk rate\n");
- clk_disable_unprepare(*clk);
- clk_put(*clk);
- return -EINVAL;
- }
-
- return 0;
-}
-
-static u64 nps_clksrc_read(struct clocksource *clksrc)
-{
- int cluster = raw_smp_processor_id() >> NPS_CLUSTER_OFFSET;
-
- return (u64)ioread32be(nps_msu_reg_low_addr[cluster]);
-}
-
-static int __init nps_setup_clocksource(struct device_node *node)
-{
- int ret, cluster;
- struct clk *clk;
- unsigned long nps_timer1_freq;
-
-
- for (cluster = 0; cluster < NPS_CLUSTER_NUM; cluster++)
- nps_msu_reg_low_addr[cluster] =
- nps_host_reg((cluster << NPS_CLUSTER_OFFSET),
- NPS_MSU_BLKID, NPS_MSU_TICK_LOW);
-
- ret = nps_get_timer_clk(node, &nps_timer1_freq, &clk);
- if (ret)
- return ret;
-
- ret = clocksource_mmio_init(nps_msu_reg_low_addr, "nps-tick",
- nps_timer1_freq, 300, 32, nps_clksrc_read);
- if (ret) {
- pr_err("Couldn't register clock source.\n");
- clk_disable_unprepare(clk);
- }
-
- return ret;
-}
-
-TIMER_OF_DECLARE(ezchip_nps400_clksrc, "ezchip,nps400-timer",
- nps_setup_clocksource);
-TIMER_OF_DECLARE(ezchip_nps400_clk_src, "ezchip,nps400-timer1",
- nps_setup_clocksource);
-
-#ifdef CONFIG_EZNPS_MTM_EXT
-#include <soc/nps/mtm.h>
-
-/* Timer related Aux registers */
-#define NPS_REG_TIMER0_TSI 0xFFFFF850
-#define NPS_REG_TIMER0_LIMIT 0x23
-#define NPS_REG_TIMER0_CTRL 0x22
-#define NPS_REG_TIMER0_CNT 0x21
-
-/*
- * Interrupt Enabled (IE) - re-arm the timer
- * Not Halted (NH) - is cleared when working with JTAG (for debug)
- */
-#define TIMER0_CTRL_IE BIT(0)
-#define TIMER0_CTRL_NH BIT(1)
-
-static unsigned long nps_timer0_freq;
-static unsigned long nps_timer0_irq;
-
-static void nps_clkevent_rm_thread(void)
-{
- int thread;
- unsigned int cflags, enabled_threads;
-
- hw_schd_save(&cflags);
-
- enabled_threads = read_aux_reg(NPS_REG_TIMER0_TSI);
-
- /* remove thread from TSI1 */
- thread = read_aux_reg(CTOP_AUX_THREAD_ID);
- enabled_threads &= ~(1 << thread);
- write_aux_reg(NPS_REG_TIMER0_TSI, enabled_threads);
-
- /* Acknowledge and if needed re-arm the timer */
- if (!enabled_threads)
- write_aux_reg(NPS_REG_TIMER0_CTRL, TIMER0_CTRL_NH);
- else
- write_aux_reg(NPS_REG_TIMER0_CTRL,
- TIMER0_CTRL_IE | TIMER0_CTRL_NH);
-
- hw_schd_restore(cflags);
-}
-
-static void nps_clkevent_add_thread(unsigned long delta)
-{
- int thread;
- unsigned int cflags, enabled_threads;
-
- hw_schd_save(&cflags);
-
- /* add thread to TSI1 */
- thread = read_aux_reg(CTOP_AUX_THREAD_ID);
- enabled_threads = read_aux_reg(NPS_REG_TIMER0_TSI);
- enabled_threads |= (1 << thread);
- write_aux_reg(NPS_REG_TIMER0_TSI, enabled_threads);
-
- /* set next timer event */
- write_aux_reg(NPS_REG_TIMER0_LIMIT, delta);
- write_aux_reg(NPS_REG_TIMER0_CNT, 0);
- write_aux_reg(NPS_REG_TIMER0_CTRL,
- TIMER0_CTRL_IE | TIMER0_CTRL_NH);
-
- hw_schd_restore(cflags);
-}
-
-/*
- * Whenever anyone tries to change modes, we just mask interrupts
- * and wait for the next event to get set.
- */
-static int nps_clkevent_set_state(struct clock_event_device *dev)
-{
- nps_clkevent_rm_thread();
- disable_percpu_irq(nps_timer0_irq);
-
- return 0;
-}
-
-static int nps_clkevent_set_next_event(unsigned long delta,
- struct clock_event_device *dev)
-{
- nps_clkevent_add_thread(delta);
- enable_percpu_irq(nps_timer0_irq, IRQ_TYPE_NONE);
-
- return 0;
-}
-
-static DEFINE_PER_CPU(struct clock_event_device, nps_clockevent_device) = {
- .name = "NPS Timer0",
- .features = CLOCK_EVT_FEAT_ONESHOT,
- .rating = 300,
- .set_next_event = nps_clkevent_set_next_event,
- .set_state_oneshot = nps_clkevent_set_state,
- .set_state_oneshot_stopped = nps_clkevent_set_state,
- .set_state_shutdown = nps_clkevent_set_state,
- .tick_resume = nps_clkevent_set_state,
-};
-
-static irqreturn_t timer_irq_handler(int irq, void *dev_id)
-{
- struct clock_event_device *evt = dev_id;
-
- nps_clkevent_rm_thread();
- evt->event_handler(evt);
-
- return IRQ_HANDLED;
-}
-
-static int nps_timer_starting_cpu(unsigned int cpu)
-{
- struct clock_event_device *evt = this_cpu_ptr(&nps_clockevent_device);
-
- evt->cpumask = cpumask_of(smp_processor_id());
-
- clockevents_config_and_register(evt, nps_timer0_freq, 0, ULONG_MAX);
- enable_percpu_irq(nps_timer0_irq, IRQ_TYPE_NONE);
-
- return 0;
-}
-
-static int nps_timer_dying_cpu(unsigned int cpu)
-{
- disable_percpu_irq(nps_timer0_irq);
- return 0;
-}
-
-static int __init nps_setup_clockevent(struct device_node *node)
-{
- struct clk *clk;
- int ret;
-
- nps_timer0_irq = irq_of_parse_and_map(node, 0);
- if (nps_timer0_irq <= 0) {
- pr_err("clockevent: missing irq\n");
- return -EINVAL;
- }
-
- ret = nps_get_timer_clk(node, &nps_timer0_freq, &clk);
- if (ret)
- return ret;
-
- /* Needs apriori irq_set_percpu_devid() done in intc map function */
- ret = request_percpu_irq(nps_timer0_irq, timer_irq_handler,
- "Timer0 (per-cpu-tick)",
- &nps_clockevent_device);
- if (ret) {
- pr_err("Couldn't request irq\n");
- clk_disable_unprepare(clk);
- return ret;
- }
-
- ret = cpuhp_setup_state(CPUHP_AP_ARC_TIMER_STARTING,
- "clockevents/nps:starting",
- nps_timer_starting_cpu,
- nps_timer_dying_cpu);
- if (ret) {
- pr_err("Failed to setup hotplug state\n");
- clk_disable_unprepare(clk);
- free_percpu_irq(nps_timer0_irq, &nps_clockevent_device);
- return ret;
- }
-
- return 0;
-}
-
-TIMER_OF_DECLARE(ezchip_nps400_clk_evt, "ezchip,nps400-timer0",
- nps_setup_clockevent);
-#endif /* CONFIG_EZNPS_MTM_EXT */
projects / linux-2.6-microblaze.git / commitdiff