281 lines
7.0 KiB
C
281 lines
7.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2015-2018, The Linux Foundation. All rights reserved.
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*/
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/*
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* Driver for interrupt combiners in the Top-level Control and Status
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* Registers (TCSR) hardware block in Qualcomm Technologies chips.
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* An interrupt combiner in this block combines a set of interrupts by
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* OR'ing the individual interrupt signals into a summary interrupt
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* signal routed to a parent interrupt controller, and provides read-
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* only, 32-bit registers to query the status of individual interrupts.
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* The status bit for IRQ n is bit (n % 32) within register (n / 32)
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* of the given combiner. Thus, each combiner can be described as a set
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* of register offsets and the number of IRQs managed.
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*/
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#define pr_fmt(fmt) "QCOM80B1:" fmt
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#include <linux/acpi.h>
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#include <linux/irqchip/chained_irq.h>
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#include <linux/irqdomain.h>
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#include <linux/platform_device.h>
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#define REG_SIZE 32
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struct combiner_reg {
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void __iomem *addr;
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unsigned long enabled;
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};
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struct combiner {
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struct irq_domain *domain;
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int parent_irq;
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u32 nirqs;
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u32 nregs;
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struct combiner_reg regs[];
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};
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static inline int irq_nr(u32 reg, u32 bit)
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{
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return reg * REG_SIZE + bit;
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}
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/*
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* Handler for the cascaded IRQ.
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*/
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static void combiner_handle_irq(struct irq_desc *desc)
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{
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struct combiner *combiner = irq_desc_get_handler_data(desc);
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struct irq_chip *chip = irq_desc_get_chip(desc);
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u32 reg;
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chained_irq_enter(chip, desc);
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for (reg = 0; reg < combiner->nregs; reg++) {
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int virq;
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int hwirq;
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u32 bit;
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u32 status;
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bit = readl_relaxed(combiner->regs[reg].addr);
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status = bit & combiner->regs[reg].enabled;
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if (bit && !status)
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pr_warn_ratelimited("Unexpected IRQ on CPU%d: (%08x %08lx %p)\n",
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smp_processor_id(), bit,
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combiner->regs[reg].enabled,
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combiner->regs[reg].addr);
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while (status) {
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bit = __ffs(status);
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status &= ~(1 << bit);
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hwirq = irq_nr(reg, bit);
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virq = irq_find_mapping(combiner->domain, hwirq);
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if (virq > 0)
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generic_handle_irq(virq);
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}
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}
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chained_irq_exit(chip, desc);
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}
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static void combiner_irq_chip_mask_irq(struct irq_data *data)
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{
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struct combiner *combiner = irq_data_get_irq_chip_data(data);
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struct combiner_reg *reg = combiner->regs + data->hwirq / REG_SIZE;
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clear_bit(data->hwirq % REG_SIZE, ®->enabled);
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}
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static void combiner_irq_chip_unmask_irq(struct irq_data *data)
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{
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struct combiner *combiner = irq_data_get_irq_chip_data(data);
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struct combiner_reg *reg = combiner->regs + data->hwirq / REG_SIZE;
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set_bit(data->hwirq % REG_SIZE, ®->enabled);
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}
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static struct irq_chip irq_chip = {
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.irq_mask = combiner_irq_chip_mask_irq,
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.irq_unmask = combiner_irq_chip_unmask_irq,
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.name = "qcom-irq-combiner"
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};
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static int combiner_irq_map(struct irq_domain *domain, unsigned int irq,
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irq_hw_number_t hwirq)
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{
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irq_set_chip_and_handler(irq, &irq_chip, handle_level_irq);
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irq_set_chip_data(irq, domain->host_data);
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irq_set_noprobe(irq);
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return 0;
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}
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static void combiner_irq_unmap(struct irq_domain *domain, unsigned int irq)
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{
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irq_domain_reset_irq_data(irq_get_irq_data(irq));
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}
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static int combiner_irq_translate(struct irq_domain *d, struct irq_fwspec *fws,
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unsigned long *hwirq, unsigned int *type)
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{
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struct combiner *combiner = d->host_data;
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if (is_acpi_node(fws->fwnode)) {
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if (WARN_ON((fws->param_count != 2) ||
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(fws->param[0] >= combiner->nirqs) ||
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(fws->param[1] & IORESOURCE_IRQ_LOWEDGE) ||
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(fws->param[1] & IORESOURCE_IRQ_HIGHEDGE)))
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return -EINVAL;
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*hwirq = fws->param[0];
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*type = fws->param[1];
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return 0;
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}
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return -EINVAL;
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}
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static const struct irq_domain_ops domain_ops = {
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.map = combiner_irq_map,
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.unmap = combiner_irq_unmap,
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.translate = combiner_irq_translate
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};
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static acpi_status count_registers_cb(struct acpi_resource *ares, void *context)
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{
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int *count = context;
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if (ares->type == ACPI_RESOURCE_TYPE_GENERIC_REGISTER)
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++(*count);
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return AE_OK;
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}
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static int count_registers(struct platform_device *pdev)
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{
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acpi_handle ahandle = ACPI_HANDLE(&pdev->dev);
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acpi_status status;
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int count = 0;
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if (!acpi_has_method(ahandle, METHOD_NAME__CRS))
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return -EINVAL;
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status = acpi_walk_resources(ahandle, METHOD_NAME__CRS,
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count_registers_cb, &count);
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if (ACPI_FAILURE(status))
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return -EINVAL;
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return count;
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}
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struct get_registers_context {
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struct device *dev;
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struct combiner *combiner;
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int err;
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};
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static acpi_status get_registers_cb(struct acpi_resource *ares, void *context)
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{
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struct get_registers_context *ctx = context;
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struct acpi_resource_generic_register *reg;
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phys_addr_t paddr;
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void __iomem *vaddr;
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if (ares->type != ACPI_RESOURCE_TYPE_GENERIC_REGISTER)
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return AE_OK;
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reg = &ares->data.generic_reg;
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paddr = reg->address;
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if ((reg->space_id != ACPI_SPACE_MEM) ||
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(reg->bit_offset != 0) ||
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(reg->bit_width > REG_SIZE)) {
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dev_err(ctx->dev, "Bad register resource @%pa\n", &paddr);
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ctx->err = -EINVAL;
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return AE_ERROR;
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}
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vaddr = devm_ioremap(ctx->dev, reg->address, REG_SIZE);
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if (!vaddr) {
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dev_err(ctx->dev, "Can't map register @%pa\n", &paddr);
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ctx->err = -ENOMEM;
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return AE_ERROR;
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}
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ctx->combiner->regs[ctx->combiner->nregs].addr = vaddr;
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ctx->combiner->nirqs += reg->bit_width;
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ctx->combiner->nregs++;
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return AE_OK;
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}
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static int get_registers(struct platform_device *pdev, struct combiner *comb)
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{
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acpi_handle ahandle = ACPI_HANDLE(&pdev->dev);
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acpi_status status;
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struct get_registers_context ctx;
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if (!acpi_has_method(ahandle, METHOD_NAME__CRS))
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return -EINVAL;
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ctx.dev = &pdev->dev;
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ctx.combiner = comb;
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ctx.err = 0;
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status = acpi_walk_resources(ahandle, METHOD_NAME__CRS,
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get_registers_cb, &ctx);
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if (ACPI_FAILURE(status))
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return ctx.err;
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return 0;
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}
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static int __init combiner_probe(struct platform_device *pdev)
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{
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struct combiner *combiner;
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int nregs;
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int err;
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nregs = count_registers(pdev);
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if (nregs <= 0) {
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dev_err(&pdev->dev, "Error reading register resources\n");
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return -EINVAL;
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}
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combiner = devm_kzalloc(&pdev->dev, struct_size(combiner, regs, nregs),
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GFP_KERNEL);
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if (!combiner)
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return -ENOMEM;
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err = get_registers(pdev, combiner);
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if (err < 0)
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return err;
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combiner->parent_irq = platform_get_irq(pdev, 0);
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if (combiner->parent_irq <= 0)
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return -EPROBE_DEFER;
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combiner->domain = irq_domain_create_linear(pdev->dev.fwnode, combiner->nirqs,
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&domain_ops, combiner);
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if (!combiner->domain)
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/* Errors printed by irq_domain_create_linear */
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return -ENODEV;
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irq_set_chained_handler_and_data(combiner->parent_irq,
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combiner_handle_irq, combiner);
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dev_info(&pdev->dev, "Initialized with [p=%d,n=%d,r=%p]\n",
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combiner->parent_irq, combiner->nirqs, combiner->regs[0].addr);
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return 0;
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}
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static const struct acpi_device_id qcom_irq_combiner_ids[] = {
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{ "QCOM80B1", },
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{ }
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};
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static struct platform_driver qcom_irq_combiner_probe = {
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.driver = {
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.name = "qcom-irq-combiner",
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.acpi_match_table = ACPI_PTR(qcom_irq_combiner_ids),
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},
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.probe = combiner_probe,
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};
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builtin_platform_driver(qcom_irq_combiner_probe);
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