diff options
author | Bin Meng <bmeng.cn@gmail.com> | 2018-12-12 06:12:30 -0800 |
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committer | Andes <uboot@andestech.com> | 2018-12-18 09:56:26 +0800 |
commit | 644a3cd77e840d1be6a714b8ce284d6ef3ad2f06 (patch) | |
tree | 1d9270086f38d553463821a2ea220087d6391867 /arch/riscv/lib/sifive_clint.c | |
parent | 3cfc825261d90472fa11ea72d7ed2d293b744140 (diff) |
riscv: Add a SYSCON driver for SiFive's Core Local Interruptor
This adds U-Boot syscon driver for SiFive's Core Local Interruptor
(CLINT). The CLINT block holds memory-mapped control and status
registers associated with software and timer interrupts.
This driver implements the riscv_get_time() API as required by
the generic RISC-V timer driver, as well as some other APIs that
are needed for handling IPI.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Reviewed-by: Anup Patel <anup@brainfault.org>
Diffstat (limited to 'arch/riscv/lib/sifive_clint.c')
-rw-r--r-- | arch/riscv/lib/sifive_clint.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/arch/riscv/lib/sifive_clint.c b/arch/riscv/lib/sifive_clint.c new file mode 100644 index 0000000000..d24e0d585b --- /dev/null +++ b/arch/riscv/lib/sifive_clint.c @@ -0,0 +1,84 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com> + * + * U-Boot syscon driver for SiFive's Core Local Interruptor (CLINT). + * The CLINT block holds memory-mapped control and status registers + * associated with software and timer interrupts. + */ + +#include <common.h> +#include <dm.h> +#include <regmap.h> +#include <syscon.h> +#include <asm/io.h> +#include <asm/syscon.h> + +/* MSIP registers */ +#define MSIP_REG(base, hart) ((ulong)(base) + (hart) * 4) +/* mtime compare register */ +#define MTIMECMP_REG(base, hart) ((ulong)(base) + 0x4000 + (hart) * 8) +/* mtime register */ +#define MTIME_REG(base) ((ulong)(base) + 0xbff8) + +DECLARE_GLOBAL_DATA_PTR; + +#define CLINT_BASE_GET(void) \ + do { \ + long *ret; \ + \ + if (!gd->arch.clint) { \ + ret = syscon_get_first_range(RISCV_SYSCON_CLINT); \ + if (IS_ERR(ret)) \ + return PTR_ERR(ret); \ + gd->arch.clint = ret; \ + } \ + } while (0) + +int riscv_get_time(u64 *time) +{ + CLINT_BASE_GET(); + + *time = readq((void __iomem *)MTIME_REG(gd->arch.clint)); + + return 0; +} + +int riscv_set_timecmp(int hart, u64 cmp) +{ + CLINT_BASE_GET(); + + writeq(cmp, (void __iomem *)MTIMECMP_REG(gd->arch.clint, hart)); + + return 0; +} + +int riscv_send_ipi(int hart) +{ + CLINT_BASE_GET(); + + writel(1, (void __iomem *)MSIP_REG(gd->arch.clint, hart)); + + return 0; +} + +int riscv_clear_ipi(int hart) +{ + CLINT_BASE_GET(); + + writel(0, (void __iomem *)MSIP_REG(gd->arch.clint, hart)); + + return 0; +} + +static const struct udevice_id sifive_clint_ids[] = { + { .compatible = "riscv,clint0", .data = RISCV_SYSCON_CLINT }, + { } +}; + +U_BOOT_DRIVER(sifive_clint) = { + .name = "sifive_clint", + .id = UCLASS_SYSCON, + .of_match = sifive_clint_ids, + .flags = DM_FLAG_PRE_RELOC, +}; |