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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (C) 2020, Sean Anderson <seanga2@gmail.com>
- * 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 <asm/global_data.h>
- #include <asm/io.h>
- #include <asm/smp.h>
- #include <linux/err.h>
- /* MSIP registers */
- #define MSIP_REG(base, hart) ((ulong)(base) + (hart) * 4)
- DECLARE_GLOBAL_DATA_PTR;
- int riscv_init_ipi(void)
- {
- int ret;
- struct udevice *dev;
- ret = uclass_get_device_by_driver(UCLASS_TIMER,
- DM_DRIVER_GET(sifive_clint), &dev);
- if (ret)
- return ret;
- gd->arch.clint = dev_read_addr_ptr(dev);
- if (!gd->arch.clint)
- return -EINVAL;
- return 0;
- }
- int riscv_send_ipi(int hart)
- {
- writel(1, (void __iomem *)MSIP_REG(gd->arch.clint, hart));
- return 0;
- }
- int riscv_clear_ipi(int hart)
- {
- writel(0, (void __iomem *)MSIP_REG(gd->arch.clint, hart));
- return 0;
- }
- int riscv_get_ipi(int hart, int *pending)
- {
- *pending = readl((void __iomem *)MSIP_REG(gd->arch.clint, hart));
- return 0;
- }
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