| /* |
| * Copyright (c) 2015 - 2023 Intel Corporation. |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #define DT_DRV_COMPAT shared_irq |
| |
| #include <errno.h> |
| |
| #include <zephyr/kernel.h> |
| #include <zephyr/device.h> |
| #include <zephyr/shared_irq.h> |
| #include <zephyr/init.h> |
| #include <zephyr/sys/sys_io.h> |
| #include <zephyr/irq.h> |
| |
| #ifdef CONFIG_IOAPIC |
| #include <zephyr/drivers/interrupt_controller/ioapic.h> |
| #endif |
| |
| typedef void (*shared_irq_config_irq_t)(void); |
| |
| struct shared_irq_config { |
| uint32_t irq_num; |
| shared_irq_config_irq_t config; |
| uint32_t client_count; |
| }; |
| |
| struct shared_irq_client { |
| const struct device *isr_dev; |
| isr_t isr_func; |
| uint32_t enabled; |
| }; |
| |
| struct shared_irq_runtime { |
| struct shared_irq_client *const client; |
| }; |
| |
| /** |
| * @brief Register a device ISR |
| * @param dev Pointer to device structure for SHARED_IRQ driver instance. |
| * @param isr_func Pointer to the ISR function for the device. |
| * @param isr_dev Pointer to the device that will service the interrupt. |
| */ |
| static int isr_register(const struct device *dev, isr_t isr_func, |
| const struct device *isr_dev) |
| { |
| struct shared_irq_runtime *clients = dev->data; |
| const struct shared_irq_config *config = dev->config; |
| uint32_t i; |
| |
| for (i = 0U; i < config->client_count; i++) { |
| if (!clients->client[i].isr_dev) { |
| clients->client[i].isr_dev = isr_dev; |
| clients->client[i].isr_func = isr_func; |
| return 0; |
| } |
| } |
| return -EIO; |
| } |
| |
| /** |
| * @brief Enable ISR for device |
| * @param dev Pointer to device structure for SHARED_IRQ driver instance. |
| * @param isr_dev Pointer to the device that will service the interrupt. |
| */ |
| static inline int enable(const struct device *dev, |
| const struct device *isr_dev) |
| { |
| struct shared_irq_runtime *clients = dev->data; |
| const struct shared_irq_config *config = dev->config; |
| uint32_t i; |
| |
| for (i = 0U; i < config->client_count; i++) { |
| if (clients->client[i].isr_dev == isr_dev) { |
| clients->client[i].enabled = 1U; |
| irq_enable(config->irq_num); |
| return 0; |
| } |
| } |
| return -EIO; |
| } |
| |
| static int last_enabled_isr(struct shared_irq_runtime *clients, int count) |
| { |
| uint32_t i; |
| |
| for (i = 0U; i < count; i++) { |
| if (clients->client[i].enabled) { |
| return 0; |
| } |
| } |
| return 1; |
| } |
| /** |
| * @brief Disable ISR for device |
| * @param dev Pointer to device structure for SHARED_IRQ driver instance. |
| * @param isr_dev Pointer to the device that will service the interrupt. |
| */ |
| static inline int disable(const struct device *dev, |
| const struct device *isr_dev) |
| { |
| struct shared_irq_runtime *clients = dev->data; |
| const struct shared_irq_config *config = dev->config; |
| uint32_t i; |
| |
| for (i = 0U; i < config->client_count; i++) { |
| if (clients->client[i].isr_dev == isr_dev) { |
| clients->client[i].enabled = 0U; |
| if (last_enabled_isr(clients, config->client_count)) { |
| irq_disable(config->irq_num); |
| } |
| return 0; |
| } |
| } |
| return -EIO; |
| } |
| |
| void shared_irq_isr(const struct device *dev) |
| { |
| struct shared_irq_runtime *clients = dev->data; |
| const struct shared_irq_config *config = dev->config; |
| uint32_t i; |
| |
| for (i = 0U; i < config->client_count; i++) { |
| if (clients->client[i].isr_dev) { |
| clients->client[i].isr_func(clients->client[i].isr_dev, config->irq_num); |
| } |
| } |
| } |
| |
| static const struct shared_irq_driver_api api_funcs = { |
| .isr_register = isr_register, |
| .enable = enable, |
| .disable = disable, |
| }; |
| |
| |
| int shared_irq_initialize(const struct device *dev) |
| { |
| const struct shared_irq_config *config = dev->config; |
| config->config(); |
| return 0; |
| } |
| |
| /* |
| * INST_SUPPORTS_DEP_ORDS_CNT: Counts the number of "elements" in |
| * DT_SUPPORTS_DEP_ORDS(n). There is a comma after each ordinal(inc. the last) |
| * Hence FOR_EACH adds "+1" once too often which has to be subtracted in the end. |
| */ |
| #define F1(x) 1 |
| #define INST_SUPPORTS_DEP_ORDS_CNT(n) \ |
| (FOR_EACH(F1, (+), DT_INST_SUPPORTS_DEP_ORDS(n)) - 1) |
| |
| #define SHARED_IRQ_CONFIG_FUNC(n) \ |
| void shared_irq_config_func_##n(void) \ |
| { \ |
| IRQ_CONNECT(DT_INST_IRQN(n), \ |
| DT_INST_IRQ(n, priority), \ |
| shared_irq_isr, \ |
| DEVICE_DT_INST_GET(n), \ |
| COND_CODE_1(DT_INST_IRQ_HAS_CELL(n, sense), \ |
| (DT_INST_IRQ(n, sense)), \ |
| (0))); \ |
| } |
| |
| #define SHARED_IRQ_INIT(n) \ |
| SHARED_IRQ_CONFIG_FUNC(n) \ |
| struct shared_irq_client clients_##n[INST_SUPPORTS_DEP_ORDS_CNT(n)]; \ |
| struct shared_irq_runtime shared_irq_data_##n = { \ |
| .client = clients_##n \ |
| }; \ |
| \ |
| const struct shared_irq_config shared_irq_config_##n = { \ |
| .irq_num = DT_INST_IRQN(n), \ |
| .client_count = INST_SUPPORTS_DEP_ORDS_CNT(n), \ |
| .config = shared_irq_config_func_##n \ |
| }; \ |
| DEVICE_DT_INST_DEFINE(n, shared_irq_initialize, \ |
| NULL, \ |
| &shared_irq_data_##n, \ |
| &shared_irq_config_##n, POST_KERNEL, \ |
| CONFIG_SHARED_IRQ_INIT_PRIORITY, \ |
| &api_funcs); |
| |
| DT_INST_FOREACH_STATUS_OKAY(SHARED_IRQ_INIT) |