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lib: sbi: Add a simple external interrupt handling framework

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Currently, the external interrupt handling is scattered between
sbi_init and sbi_trap. This patch moves all external interrupt
handling into a simple framework called sbi_irqchip.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Xiang W <wxjstz@126.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
This commit is contained in:
Anup Patel
2022-02-18 23:18:41 +05:30
committed by Anup Patel
parent f2ccf2f783
commit f3f4604c19
7 changed files with 109 additions and 34 deletions
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54
lib/sbi/sbi_irqchip.c Normal file
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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2022 Ventana Micro Systems Inc.
*
* Authors:
* Anup Patel <apatel@ventanamicro.com>
*/
#include <sbi/sbi_irqchip.h>
#include <sbi/sbi_platform.h>
static int default_irqfn(struct sbi_trap_regs *regs)
{
return SBI_ENODEV;
}
static int (*ext_irqfn)(struct sbi_trap_regs *regs) = default_irqfn;
void sbi_irqchip_set_irqfn(int (*fn)(struct sbi_trap_regs *regs))
{
if (fn)
ext_irqfn = fn;
}
int sbi_irqchip_process(struct sbi_trap_regs *regs)
{
return ext_irqfn(regs);
}
int sbi_irqchip_init(struct sbi_scratch *scratch, bool cold_boot)
{
int rc;
const struct sbi_platform *plat = sbi_platform_ptr(scratch);
rc = sbi_platform_irqchip_init(plat, cold_boot);
if (rc)
return rc;
if (ext_irqfn != default_irqfn)
csr_set(CSR_MIE, MIP_MEIP);
return 0;
}
void sbi_irqchip_exit(struct sbi_scratch *scratch)
{
const struct sbi_platform *plat = sbi_platform_ptr(scratch);
if (ext_irqfn != default_irqfn)
csr_clear(CSR_MIE, MIP_MEIP);
sbi_platform_irqchip_exit(plat);
}