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https://github.com/brain-hackers/u-boot-brain
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![Simon Glass](/assets/img/avatar_default.png)
At present driver model supports the IRQ uclass but there is no way to request a particular interrupt for a driver. Add a mechanism, similar to clock and reset, to read the interrupts required by a device from the device tree and to request those interrupts. U-Boot itself does not have interrupt-driven handlers, so just provide a means to read and clear an interrupt. This can be useful to handle peripherals which must use an interrupt to determine when data is available, for example. Bring over the basic binding file as well, from Linux v5.4. Note that the older binding is not supported in U-Boot; the newer 'special form' must be used. Add a simple test of the new functionality. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
183 lines
3.5 KiB
C
183 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2019 Google, LLC
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#define LOG_CATEGORY UCLASS_IRQ
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#include <common.h>
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#include <dm.h>
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#include <dt-structs.h>
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#include <irq.h>
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#include <dm/device-internal.h>
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int irq_route_pmc_gpio_gpe(struct udevice *dev, uint pmc_gpe_num)
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{
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const struct irq_ops *ops = irq_get_ops(dev);
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if (!ops->route_pmc_gpio_gpe)
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return -ENOSYS;
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return ops->route_pmc_gpio_gpe(dev, pmc_gpe_num);
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}
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int irq_set_polarity(struct udevice *dev, uint irq, bool active_low)
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{
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const struct irq_ops *ops = irq_get_ops(dev);
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if (!ops->set_polarity)
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return -ENOSYS;
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return ops->set_polarity(dev, irq, active_low);
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}
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int irq_snapshot_polarities(struct udevice *dev)
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{
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const struct irq_ops *ops = irq_get_ops(dev);
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if (!ops->snapshot_polarities)
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return -ENOSYS;
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return ops->snapshot_polarities(dev);
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}
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int irq_restore_polarities(struct udevice *dev)
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{
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const struct irq_ops *ops = irq_get_ops(dev);
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if (!ops->restore_polarities)
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return -ENOSYS;
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return ops->restore_polarities(dev);
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}
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int irq_read_and_clear(struct irq *irq)
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{
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const struct irq_ops *ops = irq_get_ops(irq->dev);
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if (!ops->read_and_clear)
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return -ENOSYS;
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return ops->read_and_clear(irq);
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}
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#if CONFIG_IS_ENABLED(OF_PLATDATA)
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int irq_get_by_index_platdata(struct udevice *dev, int index,
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struct phandle_1_arg *cells, struct irq *irq)
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{
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int ret;
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if (index != 0)
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return -ENOSYS;
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ret = uclass_get_device(UCLASS_IRQ, 0, &irq->dev);
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if (ret)
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return ret;
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irq->id = cells[0].arg[0];
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return 0;
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}
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#else
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static int irq_of_xlate_default(struct irq *irq,
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struct ofnode_phandle_args *args)
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{
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log_debug("(irq=%p)\n", irq);
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if (args->args_count > 1) {
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log_debug("Invaild args_count: %d\n", args->args_count);
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return -EINVAL;
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}
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if (args->args_count)
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irq->id = args->args[0];
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else
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irq->id = 0;
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return 0;
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}
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static int irq_get_by_index_tail(int ret, ofnode node,
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struct ofnode_phandle_args *args,
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const char *list_name, int index,
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struct irq *irq)
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{
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struct udevice *dev_irq;
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const struct irq_ops *ops;
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assert(irq);
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irq->dev = NULL;
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if (ret)
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goto err;
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ret = uclass_get_device_by_ofnode(UCLASS_IRQ, args->node, &dev_irq);
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if (ret) {
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log_debug("uclass_get_device_by_ofnode failed: err=%d\n", ret);
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return ret;
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}
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irq->dev = dev_irq;
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ops = irq_get_ops(dev_irq);
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if (ops->of_xlate)
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ret = ops->of_xlate(irq, args);
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else
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ret = irq_of_xlate_default(irq, args);
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if (ret) {
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log_debug("of_xlate() failed: %d\n", ret);
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return ret;
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}
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return irq_request(dev_irq, irq);
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err:
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log_debug("Node '%s', property '%s', failed to request IRQ index %d: %d\n",
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ofnode_get_name(node), list_name, index, ret);
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return ret;
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}
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int irq_get_by_index(struct udevice *dev, int index, struct irq *irq)
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{
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struct ofnode_phandle_args args;
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int ret;
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ret = dev_read_phandle_with_args(dev, "interrupts-extended",
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"#interrupt-cells", 0, index, &args);
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return irq_get_by_index_tail(ret, dev_ofnode(dev), &args,
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"interrupts-extended", index > 0, irq);
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}
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#endif /* OF_PLATDATA */
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int irq_request(struct udevice *dev, struct irq *irq)
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{
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const struct irq_ops *ops;
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log_debug("(dev=%p, irq=%p)\n", dev, irq);
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if (!irq)
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return 0;
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ops = irq_get_ops(dev);
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irq->dev = dev;
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if (!ops->request)
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return 0;
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return ops->request(irq);
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}
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int irq_first_device_type(enum irq_dev_t type, struct udevice **devp)
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{
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int ret;
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ret = uclass_first_device_drvdata(UCLASS_IRQ, type, devp);
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if (ret)
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return log_msg_ret("find", ret);
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return 0;
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}
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UCLASS_DRIVER(irq) = {
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.id = UCLASS_IRQ,
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.name = "irq",
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};
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