131 lines
2.9 KiB
C
131 lines
2.9 KiB
C
/*
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* Copyright (c) 2018 - 2019 Antmicro <www.antmicro.com>
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT litex_eth0
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#include <kernel.h>
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#include <arch/cpu.h>
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#include <init.h>
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#include <irq.h>
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#include <device.h>
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#include <zephyr.h>
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#include <zephyr/types.h>
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#define IRQ_MASK DT_REG_ADDR_BY_NAME(DT_INST(0, vexriscv_intc0), irq_mask)
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#define IRQ_PENDING DT_REG_ADDR_BY_NAME(DT_INST(0, vexriscv_intc0), irq_pending)
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#define TIMER0_IRQ DT_IRQN(DT_INST(0, litex_timer0))
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#define UART0_IRQ DT_IRQN(DT_INST(0, litex_uart0))
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#define ETH0_IRQ DT_IRQN(DT_INST(0, litex_eth0))
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#define I2S_RX_IRQ DT_IRQN(DT_NODELABEL(i2s_rx))
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#define I2S_TX_IRQ DT_IRQN(DT_NODELABEL(i2s_tx))
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static inline void vexriscv_litex_irq_setmask(uint32_t mask)
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{
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__asm__ volatile ("csrw %0, %1" :: "i"(IRQ_MASK), "r"(mask));
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}
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static inline uint32_t vexriscv_litex_irq_getmask(void)
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{
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uint32_t mask;
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__asm__ volatile ("csrr %0, %1" : "=r"(mask) : "i"(IRQ_MASK));
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return mask;
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}
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static inline uint32_t vexriscv_litex_irq_pending(void)
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{
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uint32_t pending;
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__asm__ volatile ("csrr %0, %1" : "=r"(pending) : "i"(IRQ_PENDING));
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return pending;
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}
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static inline void vexriscv_litex_irq_setie(uint32_t ie)
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{
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if (ie) {
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__asm__ volatile ("csrrs x0, mstatus, %0"
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:: "r"(MSTATUS_IEN));
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} else {
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__asm__ volatile ("csrrc x0, mstatus, %0"
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:: "r"(MSTATUS_IEN));
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}
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}
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static void vexriscv_litex_irq_handler(const void *device)
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{
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struct _isr_table_entry *ite;
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uint32_t pending, mask, irqs;
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pending = vexriscv_litex_irq_pending();
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mask = vexriscv_litex_irq_getmask();
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irqs = pending & mask;
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#ifdef CONFIG_LITEX_TIMER
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if (irqs & (1 << TIMER0_IRQ)) {
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ite = &_sw_isr_table[TIMER0_IRQ];
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ite->isr(ite->arg);
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}
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#endif
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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if (irqs & (1 << UART0_IRQ)) {
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ite = &_sw_isr_table[UART0_IRQ];
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ite->isr(ite->arg);
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}
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#endif
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#ifdef CONFIG_ETH_LITEETH
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if (irqs & (1 << ETH0_IRQ)) {
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ite = &_sw_isr_table[ETH0_IRQ];
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ite->isr(ite->arg);
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}
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#endif
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#ifdef CONFIG_I2S
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if (irqs & (1 << I2S_RX_IRQ)) {
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ite = &_sw_isr_table[I2S_RX_IRQ];
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ite->isr(ite->arg);
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}
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if (irqs & (1 << I2S_TX_IRQ)) {
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ite = &_sw_isr_table[I2S_TX_IRQ];
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ite->isr(ite->arg);
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}
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#endif
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}
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void arch_irq_enable(unsigned int irq)
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{
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vexriscv_litex_irq_setmask(vexriscv_litex_irq_getmask() | (1 << irq));
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}
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void arch_irq_disable(unsigned int irq)
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{
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vexriscv_litex_irq_setmask(vexriscv_litex_irq_getmask() & ~(1 << irq));
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}
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int arch_irq_is_enabled(unsigned int irq)
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{
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return vexriscv_litex_irq_getmask() & (1 << irq);
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}
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static int vexriscv_litex_irq_init(const struct device *dev)
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{
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ARG_UNUSED(dev);
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__asm__ volatile ("csrrs x0, mie, %0"
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:: "r"((1 << RISCV_MACHINE_TIMER_IRQ)
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| (1 << RISCV_MACHINE_EXT_IRQ)));
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vexriscv_litex_irq_setie(1);
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IRQ_CONNECT(RISCV_MACHINE_EXT_IRQ, 0, vexriscv_litex_irq_handler,
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NULL, 0);
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return 0;
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}
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SYS_INIT(vexriscv_litex_irq_init, PRE_KERNEL_2,
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CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);
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