| /* |
| * Copyright (c) 2019 Western Digital Corporation or its affiliates |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #define DT_DRV_COMPAT swerv_pic |
| |
| /** |
| * @brief SweRV EH1 PIC driver |
| */ |
| |
| #include <zephyr/kernel.h> |
| #include <zephyr/arch/cpu.h> |
| #include <zephyr/init.h> |
| #include <zephyr/sw_isr_table.h> |
| #include <zephyr/irq.h> |
| |
| #define SWERV_PIC_MAX_NUM CONFIG_NUM_IRQS |
| #define SWERV_PIC_MAX_ID (SWERV_PIC_MAX_NUM + RISCV_MAX_GENERIC_IRQ) |
| #define SWERV_PIC_MAX_PRIO 16 |
| |
| #define SWERV_PIC_mpiccfg 0x3000 |
| #define SWERV_PIC_meipl(s) (0x0 + (s)*4) |
| #define SWERV_PIC_meip(x) (0x1000 + (x)*4) |
| #define SWERV_PIC_meie(s) (0x2000 + (s)*4) |
| #define SWERV_PIC_meigwctrl(s) (0x4000 + (s)*4) |
| #define SWERV_PIC_meigwclr(s) (0x5000 + (s)*4) |
| |
| #define SWERV_PIC_meivt "0xBC8" |
| #define SWERV_PIC_meipt "0xBC9" |
| #define SWERV_PIC_meicpct "0xBCA" |
| #define SWERV_PIC_meicidpl "0xBCB" |
| #define SWERV_PIC_meicurpl "0xBCC" |
| #define SWERV_PIC_meihap "0xFC8" |
| |
| #define swerv_piccsr(csr) SWERV_PIC_##csr |
| |
| #define swerv_pic_readcsr(csr, value) \ |
| volatile("csrr %0, "swerv_piccsr(csr) : "=r" (value)) |
| #define swerv_pic_writecsr(csr, value) \ |
| volatile("csrw "swerv_piccsr(csr)", %0" :: "rK" (value)) |
| |
| static int save_irq; |
| |
| static uint32_t swerv_pic_read(uint32_t reg) |
| { |
| return *(volatile uint32_t *)(DT_INST_REG_ADDR(0) + reg); |
| } |
| |
| static void swerv_pic_write(uint32_t reg, uint32_t val) |
| { |
| *(volatile uint32_t *)(DT_INST_REG_ADDR(0) + reg) = val; |
| } |
| |
| void swerv_pic_irq_enable(uint32_t irq) |
| { |
| uint32_t key; |
| |
| if ((irq >= SWERV_PIC_MAX_ID) || (irq < RISCV_MAX_GENERIC_IRQ)) { |
| return; |
| } |
| |
| key = irq_lock(); |
| swerv_pic_write(SWERV_PIC_meie(irq - RISCV_MAX_GENERIC_IRQ), 1); |
| irq_unlock(key); |
| } |
| |
| void swerv_pic_irq_disable(uint32_t irq) |
| { |
| uint32_t key; |
| |
| if ((irq >= SWERV_PIC_MAX_ID) || (irq < RISCV_MAX_GENERIC_IRQ)) { |
| return; |
| } |
| |
| key = irq_lock(); |
| swerv_pic_write(SWERV_PIC_meie(irq - RISCV_MAX_GENERIC_IRQ), 0); |
| irq_unlock(key); |
| } |
| |
| int swerv_pic_irq_is_enabled(uint32_t irq) |
| { |
| if ((irq >= SWERV_PIC_MAX_ID) || (irq < RISCV_MAX_GENERIC_IRQ)) { |
| return -1; |
| } |
| |
| return swerv_pic_read(SWERV_PIC_meie(irq - RISCV_MAX_GENERIC_IRQ)) |
| & 0x1; |
| } |
| |
| void swerv_pic_set_priority(uint32_t irq, uint32_t priority) |
| { |
| uint32_t key; |
| |
| if (irq <= RISCV_MAX_GENERIC_IRQ) { |
| return; |
| } |
| |
| if ((irq >= SWERV_PIC_MAX_ID) || (irq < RISCV_MAX_GENERIC_IRQ)) { |
| return; |
| } |
| |
| if (priority >= SWERV_PIC_MAX_PRIO) { |
| return; |
| } |
| |
| key = irq_lock(); |
| swerv_pic_write(SWERV_PIC_meipl(irq - RISCV_MAX_GENERIC_IRQ), priority); |
| irq_unlock(key); |
| } |
| |
| int swerv_pic_get_irq(void) |
| { |
| return save_irq; |
| } |
| |
| static void swerv_pic_irq_handler(const void *arg) |
| { |
| uint32_t tmp; |
| uint32_t irq; |
| struct _isr_table_entry *ite; |
| |
| /* trigger the capture of the interrupt source ID */ |
| __asm__ swerv_pic_writecsr(meicpct, 0); |
| |
| __asm__ swerv_pic_readcsr(meihap, tmp); |
| irq = (tmp >> 2) & 0xff; |
| |
| save_irq = irq; |
| |
| if (irq == 0U || irq >= 64) { |
| z_irq_spurious(NULL); |
| } |
| irq += RISCV_MAX_GENERIC_IRQ; |
| |
| /* Call the corresponding IRQ handler in _sw_isr_table */ |
| ite = (struct _isr_table_entry *)&_sw_isr_table[irq]; |
| if (ite->isr) { |
| ite->isr(ite->arg); |
| } |
| |
| swerv_pic_write(SWERV_PIC_meigwclr(irq), 0); |
| } |
| |
| static int swerv_pic_init(void) |
| { |
| int i; |
| |
| /* Init priority order to 0, 0=lowest to 15=highest */ |
| swerv_pic_write(SWERV_PIC_mpiccfg, 0); |
| |
| /* Ensure that all interrupts are disabled initially */ |
| for (i = 1; i < SWERV_PIC_MAX_ID; i++) { |
| swerv_pic_write(SWERV_PIC_meie(i), 0); |
| } |
| |
| /* Set priority of each interrupt line to 0 initially */ |
| for (i = 1; i < SWERV_PIC_MAX_ID; i++) { |
| swerv_pic_write(SWERV_PIC_meipl(i), 15); |
| } |
| |
| /* Set property of each interrupt line to level-triggered/high */ |
| for (i = 1; i < SWERV_PIC_MAX_ID; i++) { |
| swerv_pic_write(SWERV_PIC_meigwctrl(i), (0<<1)|(0<<0)); |
| } |
| |
| /* clear pending of each interrupt line */ |
| for (i = 1; i < SWERV_PIC_MAX_ID; i++) { |
| swerv_pic_write(SWERV_PIC_meigwclr(i), 0); |
| } |
| |
| /* No interrupts masked */ |
| __asm__ swerv_pic_writecsr(meipt, 0); |
| __asm__ swerv_pic_writecsr(meicidpl, 0); |
| __asm__ swerv_pic_writecsr(meicurpl, 0); |
| |
| /* Setup IRQ handler for SweRV PIC driver */ |
| IRQ_CONNECT(RISCV_MACHINE_EXT_IRQ, |
| 0, |
| swerv_pic_irq_handler, |
| NULL, |
| 0); |
| |
| /* Enable IRQ for SweRV PIC driver */ |
| irq_enable(RISCV_MACHINE_EXT_IRQ); |
| |
| return 0; |
| } |
| |
| void arch_irq_enable(unsigned int irq) |
| { |
| uint32_t mie; |
| |
| if (irq > RISCV_MAX_GENERIC_IRQ) { |
| swerv_pic_irq_enable(irq); |
| return; |
| } |
| |
| /* |
| * CSR mie register is updated using atomic instruction csrrs |
| * (atomic read and set bits in CSR register) |
| */ |
| __asm__ volatile ("csrrs %0, mie, %1\n" |
| : "=r" (mie) |
| : "r" (1 << irq)); |
| } |
| |
| void arch_irq_disable(unsigned int irq) |
| { |
| uint32_t mie; |
| |
| if (irq > RISCV_MAX_GENERIC_IRQ) { |
| swerv_pic_irq_disable(irq); |
| return; |
| } |
| |
| /* |
| * Use atomic instruction csrrc to disable device interrupt in mie CSR. |
| * (atomic read and clear bits in CSR register) |
| */ |
| __asm__ volatile ("csrrc %0, mie, %1\n" |
| : "=r" (mie) |
| : "r" (1 << irq)); |
| }; |
| |
| int arch_irq_is_enabled(unsigned int irq) |
| { |
| uint32_t mie; |
| |
| if (irq > RISCV_MAX_GENERIC_IRQ) |
| return swerv_pic_irq_is_enabled(irq); |
| |
| __asm__ volatile ("csrr %0, mie" : "=r" (mie)); |
| |
| return !!(mie & (1 << irq)); |
| } |
| |
| SYS_INIT(swerv_pic_init, PRE_KERNEL_1, CONFIG_INTC_INIT_PRIORITY); |