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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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26
lib/sbi/sbi_trap.c
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@@ -15,6 +15,7 @@
#include <sbi/sbi_hart.h>
#include <sbi/sbi_illegal_insn.h>
#include <sbi/sbi_ipi.h>
#include <sbi/sbi_irqchip.h>
#include <sbi/sbi_misaligned_ldst.h>
#include <sbi/sbi_pmu.h>
#include <sbi/sbi_scratch.h>
@@ -195,27 +196,6 @@ int sbi_trap_redirect(struct sbi_trap_regs *regs,
return 0;
}
static int default_irqfn(struct sbi_trap_regs *regs)
{
return SBI_ENODEV;
}
static int (*ext_irqfn)(struct sbi_trap_regs *regs) = default_irqfn;
/**
* Set external irq handler function
*
* This function is called by OpenSBI platform code to set a handler for
* external interrupts
*
* @param fn function pointer for handling external irqs
*/
void sbi_trap_set_external_irqfn(int (*fn)(struct sbi_trap_regs *regs))
{
if (fn)
ext_irqfn = fn;
}
static int sbi_trap_nonaia_irq(struct sbi_trap_regs *regs, ulong mcause)
{
mcause &= ~(1UL << (__riscv_xlen - 1));
@@ -227,7 +207,7 @@ static int sbi_trap_nonaia_irq(struct sbi_trap_regs *regs, ulong mcause)
sbi_ipi_process();
break;
case IRQ_M_EXT:
return ext_irqfn(regs);
return sbi_irqchip_process(regs);
default:
return SBI_ENOENT;
};
@@ -250,7 +230,7 @@ static int sbi_trap_aia_irq(struct sbi_trap_regs *regs, ulong mcause)
sbi_ipi_process();
break;
case IRQ_M_EXT:
rc = ext_irqfn(regs);
rc = sbi_irqchip_process(regs);
if (rc)
return rc;
break;