From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,UNPARSEABLE_RELAY, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 89D67C32789 for ; Fri, 2 Nov 2018 16:51:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4DB6120843 for ; Fri, 2 Nov 2018 16:51:40 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4DB6120843 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=c-sky.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727941AbeKCB7Y (ORCPT ); Fri, 2 Nov 2018 21:59:24 -0400 Received: from smtp2200-217.mail.aliyun.com ([121.197.200.217]:34189 "EHLO smtp2200-217.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726318AbeKCB7Y (ORCPT ); Fri, 2 Nov 2018 21:59:24 -0400 X-Alimail-AntiSpam: AC=CONTINUE;BC=0.07437128|-1;CH=green;FP=0|0|0|0|0|-1|-1|-1;HT=e02c03303;MF=ren_guo@c-sky.com;NM=1;PH=DS;RN=7;RT=7;SR=0;TI=SMTPD_---.DCM6esX_1541177493; Received: from localhost(mailfrom:ren_guo@c-sky.com fp:SMTPD_---.DCM6esX_1541177493) by smtp.aliyun-inc.com(10.147.40.200); Sat, 03 Nov 2018 00:51:33 +0800 From: Guo Ren To: daniel.lezcano@linaro.org, tglx@linutronix.de Cc: arnd@arndb.de, linux-arch@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Guo Ren Subject: [PATCH V13 resend 1/4] clocksource: add C-SKY SMP timer Date: Sat, 3 Nov 2018 00:51:28 +0800 Message-Id: <7becd836e1477d7ac2d3f8538a6d7f5b9651c389.1539579760.git.ren_guo@c-sky.com> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Message-ID: <20181102165128.T2X6BhgakpmDgbF_vZHh__bQ5C-Qk9sja8ts1y6qfk4@z> The driver is for C-SKY SMP timer. It only support oneshot event and 32bit overflow for clocksource. Per cpu core has one timer and all timers share one clock-counter-input the same clocksource. This use mfcr&mtcr instructions to access the regs. Signed-off-by: Guo Ren Cc: Daniel Lezcano Cc: Thomas Gleixner --- Changelog: - Add COMPILE_TEST - Fixup smp boot error, cpuhp_setup_state must after timer_of_init() - Add rollback for timer_of_cleanup. - Use request_percpu_irq separate from time_of. - Remove #define CPUHP_AP_CSKY_TIMER_STARTING. - Add CPUHP_AP_CSKY_TIMER_STARTING in cpuhotplug.h. - Support csky mp timer alpha version. - Just use low-counter with 32bit width as clocksource. - Coding convention with upstream feed-back. --- --- drivers/clocksource/Kconfig | 10 +++ drivers/clocksource/Makefile | 1 + drivers/clocksource/timer-mp-csky.c | 173 ++++++++++++++++++++++++++++++++++++ include/linux/cpuhotplug.h | 1 + 4 files changed, 185 insertions(+) create mode 100644 drivers/clocksource/timer-mp-csky.c diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig index a11f4ba..591c9a8 100644 --- a/drivers/clocksource/Kconfig +++ b/drivers/clocksource/Kconfig @@ -620,4 +620,14 @@ config RISCV_TIMER is accessed via both the SBI and the rdcycle instruction. This is required for all RISC-V systems. +config CSKY_MP_TIMER + bool "SMP Timer for the C-SKY platform" if COMPILE_TEST + depends on CSKY + select TIMER_OF + help + Say yes here to enable C-SKY SMP timer driver used for C-SKY SMP + system. + csky,mptimer is not only used in SMP system, it also could be used + single core system. It's not a mmio reg and it use mtcr/mfcr instruction. + endmenu diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile index db51b24..5ce82d3 100644 --- a/drivers/clocksource/Makefile +++ b/drivers/clocksource/Makefile @@ -79,3 +79,4 @@ obj-$(CONFIG_CLKSRC_ST_LPC) += clksrc_st_lpc.o obj-$(CONFIG_X86_NUMACHIP) += numachip.o obj-$(CONFIG_ATCPIT100_TIMER) += timer-atcpit100.o obj-$(CONFIG_RISCV_TIMER) += riscv_timer.o +obj-$(CONFIG_CSKY_MP_TIMER) += timer-mp-csky.o diff --git a/drivers/clocksource/timer-mp-csky.c b/drivers/clocksource/timer-mp-csky.c new file mode 100644 index 0000000..a8acc43 --- /dev/null +++ b/drivers/clocksource/timer-mp-csky.c @@ -0,0 +1,173 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#include +#include +#include +#include +#include +#include + +#include "timer-of.h" + +#define PTIM_CCVR "cr<3, 14>" +#define PTIM_CTLR "cr<0, 14>" +#define PTIM_LVR "cr<6, 14>" +#define PTIM_TSR "cr<1, 14>" + +static int csky_mptimer_irq; + +static int csky_mptimer_set_next_event(unsigned long delta, + struct clock_event_device *ce) +{ + mtcr(PTIM_LVR, delta); + + return 0; +} + +static int csky_mptimer_shutdown(struct clock_event_device *ce) +{ + mtcr(PTIM_CTLR, 0); + + return 0; +} + +static int csky_mptimer_oneshot(struct clock_event_device *ce) +{ + mtcr(PTIM_CTLR, 1); + + return 0; +} + +static int csky_mptimer_oneshot_stopped(struct clock_event_device *ce) +{ + mtcr(PTIM_CTLR, 0); + + return 0; +} + +static DEFINE_PER_CPU(struct timer_of, csky_to) = { + .flags = TIMER_OF_CLOCK, + .clkevt = { + .rating = 300, + .features = CLOCK_EVT_FEAT_PERCPU | + CLOCK_EVT_FEAT_ONESHOT, + .set_state_shutdown = csky_mptimer_shutdown, + .set_state_oneshot = csky_mptimer_oneshot, + .set_state_oneshot_stopped = csky_mptimer_oneshot_stopped, + .set_next_event = csky_mptimer_set_next_event, + }, +}; + +static irqreturn_t csky_timer_interrupt(int irq, void *dev) +{ + struct timer_of *to = this_cpu_ptr(&csky_to); + + mtcr(PTIM_TSR, 0); + + to->clkevt.event_handler(&to->clkevt); + + return IRQ_HANDLED; +} + +/* + * clock event for percpu + */ +static int csky_mptimer_starting_cpu(unsigned int cpu) +{ + struct timer_of *to = per_cpu_ptr(&csky_to, cpu); + + to->clkevt.cpumask = cpumask_of(cpu); + + clockevents_config_and_register(&to->clkevt, timer_of_rate(to), + 2, ULONG_MAX); + + enable_percpu_irq(csky_mptimer_irq, 0); + + return 0; +} + +static int csky_mptimer_dying_cpu(unsigned int cpu) +{ + disable_percpu_irq(csky_mptimer_irq); + + return 0; +} + +/* + * clock source + */ +static u64 sched_clock_read(void) +{ + return (u64)mfcr(PTIM_CCVR); +} + +static u64 clksrc_read(struct clocksource *c) +{ + return (u64)mfcr(PTIM_CCVR); +} + +struct clocksource csky_clocksource = { + .name = "csky", + .rating = 400, + .mask = CLOCKSOURCE_MASK(32), + .flags = CLOCK_SOURCE_IS_CONTINUOUS, + .read = clksrc_read, +}; + +static int __init csky_mptimer_init(struct device_node *np) +{ + int ret, cpu, cpu_rollback; + struct timer_of *to = NULL; + + /* + * Csky_mptimer is designed for C-SKY SMP multi-processors and + * every core has it's own private irq and regs for clkevt and + * clksrc. + * + * The regs is accessed by cpu instruction: mfcr/mtcr instead of + * mmio map style. So we needn't mmio-address in dts, but we still + * need to give clk and irq number. + * + * We use private irq for the mptimer and irq number is the same + * for every core. So we use request_percpu_irq() in timer_of_init. + */ + csky_mptimer_irq = irq_of_parse_and_map(np, 0); + if (csky_mptimer_irq <= 0) + return -EINVAL; + + ret = request_percpu_irq(csky_mptimer_irq, csky_timer_interrupt, + "csky_mp_timer", &csky_to); + if (ret) + return -EINVAL; + + for_each_possible_cpu(cpu) { + to = per_cpu_ptr(&csky_to, cpu); + ret = timer_of_init(np, to); + if (ret) + goto rollback; + } + + clocksource_register_hz(&csky_clocksource, timer_of_rate(to)); + sched_clock_register(sched_clock_read, 32, timer_of_rate(to)); + + ret = cpuhp_setup_state(CPUHP_AP_CSKY_TIMER_STARTING, + "clockevents/csky/timer:starting", + csky_mptimer_starting_cpu, + csky_mptimer_dying_cpu); + if (ret) + return -EINVAL; + + return 0; + +rollback: + for_each_possible_cpu(cpu_rollback) { + if (cpu_rollback == cpu) + break; + + to = per_cpu_ptr(&csky_to, cpu_rollback); + timer_of_cleanup(to); + } + return -EINVAL; +} +TIMER_OF_DECLARE(csky_mptimer, "csky,mptimer", csky_mptimer_init); diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h index caf40ad..e0cd2ba 100644 --- a/include/linux/cpuhotplug.h +++ b/include/linux/cpuhotplug.h @@ -126,6 +126,7 @@ enum cpuhp_state { CPUHP_AP_MIPS_GIC_TIMER_STARTING, CPUHP_AP_ARC_TIMER_STARTING, CPUHP_AP_RISCV_TIMER_STARTING, + CPUHP_AP_CSKY_TIMER_STARTING, CPUHP_AP_KVM_STARTING, CPUHP_AP_KVM_ARM_VGIC_INIT_STARTING, CPUHP_AP_KVM_ARM_VGIC_STARTING, -- 2.7.4