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Mon, 30 Aug 2021 04:18:37 +0000 From: Anup Patel To: Palmer Dabbelt , Palmer Dabbelt , Paul Walmsley , Thomas Gleixner , Marc Zyngier , Daniel Lezcano , Rob Herring Cc: Atish Patra , Alistair Francis , Anup Patel , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Anup Patel , Bin Meng Subject: [RFC PATCH v3 10/11] clocksource: clint: Add support for ACLINT MTIMER device Date: Mon, 30 Aug 2021 09:47:28 +0530 Message-Id: <20210830041729.237252-11-anup.patel@wdc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210830041729.237252-1-anup.patel@wdc.com> References: <20210830041729.237252-1-anup.patel@wdc.com> X-ClientProxiedBy: MA1PR0101CA0002.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a00:21::12) To SJ0PR04MB7821.namprd04.prod.outlook.com (2603:10b6:a03:3ac::8) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from wdc.com (122.179.63.14) by MA1PR0101CA0002.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a00:21::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4457.18 via Frontend Transport; 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This patch extends the CLINT timer driver to support both CLINT device and ACLINT MTIMER device. Signed-off-by: Anup Patel Reviewed-by: Bin Meng --- drivers/clocksource/timer-clint.c | 46 +++++++++++++++++++++++-------- 1 file changed, 34 insertions(+), 12 deletions(-) diff --git a/drivers/clocksource/timer-clint.c b/drivers/clocksource/timer-clint.c index 3b68ed53fe4a..10bbaf1bcf04 100644 --- a/drivers/clocksource/timer-clint.c +++ b/drivers/clocksource/timer-clint.c @@ -2,8 +2,16 @@ /* * Copyright (C) 2020 Western Digital Corporation or its affiliates. * - * Most of the M-mode (i.e. NoMMU) RISC-V systems usually have a - * CLINT MMIO timer device. + * Most of the M-mode (i.e. NoMMU) RISC-V systems usually have a CLINT + * MMIO device which is a composite device capable of injecting M-mode + * software interrupts and M-mode timer interrupts. + * + * The RISC-V ACLINT specification is modular in nature and defines + * separate devices for M-mode software interrupt (MSWI), M-mode timer + * (MTIMER) and S-mode software interrupt (SSWI). + * + * This is a common timer driver for the CLINT device and the ACLINT + * MTIMER device. */ #define pr_fmt(fmt) "clint: " fmt @@ -21,8 +29,11 @@ #include #include -#ifndef CONFIG_RISCV_M_MODE +#ifdef CONFIG_RISCV_M_MODE #include + +u64 __iomem *clint_time_val; +EXPORT_SYMBOL(clint_time_val); #endif #define CLINT_IPI_OFF 0 @@ -35,11 +46,6 @@ static u64 __iomem *clint_timer_val; static unsigned long clint_timer_freq; static unsigned int clint_timer_irq; -#ifdef CONFIG_RISCV_M_MODE -u64 __iomem *clint_time_val; -EXPORT_SYMBOL(clint_time_val); -#endif - #ifdef CONFIG_64BIT #define clint_get_cycles() readq_relaxed(clint_timer_val) #else @@ -129,7 +135,8 @@ static int __init clint_timer_init_dt(struct device_node *np) { int rc; u32 i, nr_irqs; - void __iomem *base; + void __iomem *base = NULL; + void __iomem *base1 = NULL; struct of_phandle_args oirq; /* @@ -170,8 +177,19 @@ static int __init clint_timer_init_dt(struct device_node *np) return -ENODEV; } - clint_timer_cmp = base + CLINT_TIMER_CMP_OFF; - clint_timer_val = base + CLINT_TIMER_VAL_OFF; + if (of_device_is_compatible(np, "riscv,aclint-mtimer")) { + clint_timer_val = base; + base1 = of_iomap(np, 1); + if (!base1) { + rc = -ENODEV; + pr_err("%pOFP: could not map registers\n", np); + goto fail_iounmap; + } + clint_timer_cmp = base1; + } else { + clint_timer_cmp = base + CLINT_TIMER_CMP_OFF; + clint_timer_val = base + CLINT_TIMER_VAL_OFF; + } clint_timer_freq = riscv_timebase; #ifdef CONFIG_RISCV_M_MODE @@ -213,9 +231,13 @@ static int __init clint_timer_init_dt(struct device_node *np) fail_free_irq: free_irq(clint_timer_irq, &clint_clock_event); fail_iounmap: - iounmap(base); + if (base1) + iounmap(base1); + if (base) + iounmap(base); return rc; } TIMER_OF_DECLARE(clint_timer, "riscv,clint0", clint_timer_init_dt); TIMER_OF_DECLARE(clint_timer1, "sifive,clint0", clint_timer_init_dt); +TIMER_OF_DECLARE(clint_timer2, "riscv,aclint-mtimer", clint_timer_init_dt);