--- /dev/null
+--- a/drivers/irqchip/irq-realtek-rtl.c
++++ b/drivers/irqchip/irq-realtek-rtl.c
+@@ -21,21 +21,63 @@
+ #define RTL_ICTL_IRR2 0x10
+ #define RTL_ICTL_IRR3 0x14
+
+-#define REG(x) (realtek_ictl_base + x)
++#define RTL_ICTL_NUM_INPUTS 32
++#define RTL_ICTL_NUM_OUTPUTS 15
+
+ static DEFINE_RAW_SPINLOCK(irq_lock);
+-static void __iomem *realtek_ictl_base;
++
++#define REG(offset, cpu) (realtek_ictl_base[cpu] + offset)
++
++static void __iomem *realtek_ictl_base[NR_CPUS];
++static cpumask_t realtek_ictl_cpu_configurable;
++
++struct realtek_ictl_output {
++ /* IRQ controller data */
++ struct fwnode_handle *fwnode;
++ /* Output specific data */
++ unsigned int output_index;
++ struct irq_domain *domain;
++ u32 child_mask;
++};
++
++/*
++ * IRR0-IRR3 store 4 bits per interrupt, but Realtek uses inverted numbering,
++ * placing IRQ 31 in the first four bits. A routing value of '0' means the
++ * interrupt is left disconnected. Routing values {1..15} connect to output
++ * lines {0..14}.
++ */
++#define IRR_OFFSET(idx) (4 * (3 - (idx * 4) / 32))
++#define IRR_SHIFT(idx) ((idx * 4) % 32)
++
++static inline u32 read_irr(void __iomem *irr0, int idx)
++{
++ return (readl(irr0 + IRR_OFFSET(idx)) >> IRR_SHIFT(idx)) & 0xf;
++}
++
++static inline void write_irr(void __iomem *irr0, int idx, u32 value)
++{
++ unsigned int offset = IRR_OFFSET(idx);
++ unsigned int shift = IRR_SHIFT(idx);
++ u32 irr;
++
++ irr = readl(irr0 + offset) & ~(0xf << shift);
++ irr |= (value & 0xf) << shift;
++ writel(irr, irr0 + offset);
++}
+
+ static void realtek_ictl_unmask_irq(struct irq_data *i)
+ {
+ unsigned long flags;
+ u32 value;
++ int cpu;
+
+ raw_spin_lock_irqsave(&irq_lock, flags);
+
+- value = readl(REG(RTL_ICTL_GIMR));
+- value |= BIT(i->hwirq);
+- writel(value, REG(RTL_ICTL_GIMR));
++ for_each_cpu(cpu, &realtek_ictl_cpu_configurable) {
++ value = readl(REG(RTL_ICTL_GIMR, cpu));
++ value |= BIT(i->hwirq);
++ writel(value, REG(RTL_ICTL_GIMR, cpu));
++ }
+
+ raw_spin_unlock_irqrestore(&irq_lock, flags);
+ }
+@@ -44,137 +86,247 @@ static void realtek_ictl_mask_irq(struct
+ {
+ unsigned long flags;
+ u32 value;
++ int cpu;
+
+ raw_spin_lock_irqsave(&irq_lock, flags);
+
+- value = readl(REG(RTL_ICTL_GIMR));
+- value &= ~BIT(i->hwirq);
+- writel(value, REG(RTL_ICTL_GIMR));
++ for_each_cpu(cpu, &realtek_ictl_cpu_configurable) {
++ value = readl(REG(RTL_ICTL_GIMR, cpu));
++ value &= ~BIT(i->hwirq);
++ writel(value, REG(RTL_ICTL_GIMR, cpu));
++ }
+
+ raw_spin_unlock_irqrestore(&irq_lock, flags);
+ }
+
++static int __maybe_unused realtek_ictl_irq_affinity(struct irq_data *i,
++ const struct cpumask *dest, bool force)
++{
++ struct realtek_ictl_output *output = i->domain->host_data;
++ cpumask_t cpu_configure;
++ cpumask_t cpu_disable;
++ cpumask_t cpu_enable;
++ unsigned long flags;
++ int cpu;
++
++ raw_spin_lock_irqsave(&irq_lock, flags);
++
++ cpumask_and(&cpu_configure, cpu_present_mask, &realtek_ictl_cpu_configurable);
++
++ cpumask_and(&cpu_enable, &cpu_configure, dest);
++ cpumask_andnot(&cpu_disable, &cpu_configure, dest);
++
++ for_each_cpu(cpu, &cpu_disable)
++ write_irr(REG(RTL_ICTL_IRR0, cpu), i->hwirq, 0);
++
++ for_each_cpu(cpu, &cpu_enable)
++ write_irr(REG(RTL_ICTL_IRR0, cpu), i->hwirq, output->output_index + 1);
++
++ irq_data_update_effective_affinity(i, &cpu_enable);
++
++ raw_spin_unlock_irqrestore(&irq_lock, flags);
++
++ return IRQ_SET_MASK_OK;
++}
++
+ static struct irq_chip realtek_ictl_irq = {
+ .name = "realtek-rtl-intc",
+ .irq_mask = realtek_ictl_mask_irq,
+ .irq_unmask = realtek_ictl_unmask_irq,
++#ifdef CONFIG_SMP
++ .irq_set_affinity = realtek_ictl_irq_affinity,
++#endif
+ };
+
+ static int intc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
+ {
+- irq_set_chip_and_handler(hw, &realtek_ictl_irq, handle_level_irq);
++ struct realtek_ictl_output *output = d->host_data;
++ unsigned long flags;
++
++ irq_set_chip_and_handler(irq, &realtek_ictl_irq, handle_level_irq);
++
++ raw_spin_lock_irqsave(&irq_lock, flags);
++
++ output->child_mask |= BIT(hw);
++ write_irr(REG(RTL_ICTL_IRR0, 0), hw, output->output_index + 1);
++
++ raw_spin_unlock_irqrestore(&irq_lock, flags);
+
+ return 0;
+ }
+
++static int intc_select(struct irq_domain *d, struct irq_fwspec *fwspec,
++ enum irq_domain_bus_token bus_token)
++{
++ struct realtek_ictl_output *output = d->host_data;
++ bool routed_elsewhere;
++ unsigned long flags;
++ u32 routing_old;
++ int cpu;
++
++ if (fwspec->fwnode != output->fwnode)
++ return false;
++
++ /* Original specifiers had only one parameter */
++ if (fwspec->param_count < 2)
++ return true;
++
++ raw_spin_lock_irqsave(&irq_lock, flags);
++
++ /*
++ * Inputs can only be routed to one output, so they shouldn't be
++ * allowed to end up in multiple domains.
++ */
++ for_each_cpu(cpu, &realtek_ictl_cpu_configurable) {
++ routing_old = read_irr(REG(RTL_ICTL_IRR0, cpu), fwspec->param[0]);
++ routed_elsewhere = routing_old && fwspec->param[1] != routing_old - 1;
++ if (routed_elsewhere) {
++ pr_warn("soc int %d already routed to output %d\n",
++ fwspec->param[0], routing_old - 1);
++ break;
++ }
++ }
++
++ raw_spin_unlock_irqrestore(&irq_lock, flags);
++
++ return !routed_elsewhere && fwspec->param[1] == output->output_index;
++}
++
+ static const struct irq_domain_ops irq_domain_ops = {
+ .map = intc_map,
++ .select = intc_select,
+ .xlate = irq_domain_xlate_onecell,
+ };
+
+ static void realtek_irq_dispatch(struct irq_desc *desc)
+ {
++ struct realtek_ictl_output *output = irq_desc_get_handler_data(desc);
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+- struct irq_domain *domain;
+- unsigned int pending;
++ int cpu = smp_processor_id();
++ unsigned long pending;
++ unsigned int soc_int;
+
+ chained_irq_enter(chip, desc);
+- pending = readl(REG(RTL_ICTL_GIMR)) & readl(REG(RTL_ICTL_GISR));
++ pending = readl(REG(RTL_ICTL_GIMR, cpu)) & readl(REG(RTL_ICTL_GISR, cpu))
++ & output->child_mask;
++
+ if (unlikely(!pending)) {
+ spurious_interrupt();
+ goto out;
+ }
+- domain = irq_desc_get_handler_data(desc);
+- generic_handle_irq(irq_find_mapping(domain, __ffs(pending)));
++
++ for_each_set_bit(soc_int, &pending, RTL_ICTL_NUM_INPUTS)
++ generic_handle_irq(irq_find_mapping(output->domain, soc_int));
++// generic_handle_domain_irq(output->domain, soc_int);
+
+ out:
+ chained_irq_exit(chip, desc);
+ }
+
+-/*
+- * SoC interrupts are cascaded to MIPS CPU interrupts according to the
+- * interrupt-map in the device tree. Each SoC interrupt gets 4 bits for
+- * the CPU interrupt in an Interrupt Routing Register. Max 32 SoC interrupts
+- * thus go into 4 IRRs.
+- */
+-static int __init map_interrupts(struct device_node *node, struct irq_domain *domain)
++static int __init setup_parent_interrupts(struct device_node *node, int *parents,
++ unsigned int num_parents)
+ {
+- struct device_node *cpu_ictl;
+- const __be32 *imap;
+- u32 imaplen, soc_int, cpu_int, tmp, regs[4];
+- int ret, i, irr_regs[] = {
+- RTL_ICTL_IRR3,
+- RTL_ICTL_IRR2,
+- RTL_ICTL_IRR1,
+- RTL_ICTL_IRR0,
+- };
+- u8 mips_irqs_set;
++ struct realtek_ictl_output *outputs;
++ struct realtek_ictl_output *output;
++ struct irq_domain *domain;
++ unsigned int p;
+
+- ret = of_property_read_u32(node, "#address-cells", &tmp);
+- if (ret || tmp)
+- return -EINVAL;
++ outputs = kcalloc(num_parents, sizeof(*outputs), GFP_KERNEL);
++ if (!outputs)
++ return -ENOMEM;
+
+- imap = of_get_property(node, "interrupt-map", &imaplen);
+- if (!imap || imaplen % 3)
+- return -EINVAL;
++ for (p = 0; p < num_parents; p++) {
++ output = outputs + p;
+
+- mips_irqs_set = 0;
+- memset(regs, 0, sizeof(regs));
+- for (i = 0; i < imaplen; i += 3 * sizeof(u32)) {
+- soc_int = be32_to_cpup(imap);
+- if (soc_int > 31)
+- return -EINVAL;
+-
+- cpu_ictl = of_find_node_by_phandle(be32_to_cpup(imap + 1));
+- if (!cpu_ictl)
+- return -EINVAL;
+- ret = of_property_read_u32(cpu_ictl, "#interrupt-cells", &tmp);
+- if (ret || tmp != 1)
+- return -EINVAL;
+- of_node_put(cpu_ictl);
+-
+- cpu_int = be32_to_cpup(imap + 2);
+- if (cpu_int > 7)
+- return -EINVAL;
+-
+- if (!(mips_irqs_set & BIT(cpu_int))) {
+- irq_set_chained_handler_and_data(cpu_int, realtek_irq_dispatch,
+- domain);
+- mips_irqs_set |= BIT(cpu_int);
+- }
++ domain = irq_domain_add_linear(node, RTL_ICTL_NUM_INPUTS, &irq_domain_ops, output);
++ if (!domain)
++ goto domain_err;
+
+- regs[(soc_int * 4) / 32] |= cpu_int << (soc_int * 4) % 32;
+- imap += 3;
+- }
++ output->fwnode = of_node_to_fwnode(node);
++ output->output_index = p;
++ output->domain = domain;
+
+- for (i = 0; i < 4; i++)
+- writel(regs[i], REG(irr_regs[i]));
++ irq_set_chained_handler_and_data(parents[p], realtek_irq_dispatch, output);
++ }
+
+ return 0;
++
++domain_err:
++ while (p--) {
++ irq_set_chained_handler_and_data(parents[p], NULL, NULL);
++ irq_domain_remove(outputs[p].domain);
++ }
++
++ kfree(outputs);
++
++ return -ENOMEM;
+ }
+
+ static int __init realtek_rtl_of_init(struct device_node *node, struct device_node *parent)
+ {
+- struct irq_domain *domain;
+- int ret;
++ int parent_irqs[RTL_ICTL_NUM_OUTPUTS];
++ struct of_phandle_args oirq;
++ unsigned int num_parents;
++ unsigned int soc_irq;
++ unsigned int p;
++ int cpu;
++
++ cpumask_clear(&realtek_ictl_cpu_configurable);
++
++ for (cpu = 0; cpu < NR_CPUS; cpu++) {
++ realtek_ictl_base[cpu] = of_iomap(node, cpu);
++ if (realtek_ictl_base[cpu]) {
++ cpumask_set_cpu(cpu, &realtek_ictl_cpu_configurable);
++
++ /* Disable all cascaded interrupts and clear routing */
++ writel(0, REG(RTL_ICTL_GIMR, cpu));
++ for (soc_irq = 0; soc_irq < RTL_ICTL_NUM_INPUTS; soc_irq++)
++ write_irr(REG(RTL_ICTL_IRR0, cpu), soc_irq, 0);
++ }
++ }
+
+- realtek_ictl_base = of_iomap(node, 0);
+- if (!realtek_ictl_base)
++ if (cpumask_empty(&realtek_ictl_cpu_configurable))
+ return -ENXIO;
+
+- /* Disable all cascaded interrupts */
+- writel(0, REG(RTL_ICTL_GIMR));
++ num_parents = of_irq_count(node);
++ if (num_parents > RTL_ICTL_NUM_OUTPUTS) {
++ pr_err("too many parent interrupts\n");
++ return -EINVAL;
++ }
+
+- domain = irq_domain_add_simple(node, 32, 0,
+- &irq_domain_ops, NULL);
++ for (p = 0; p < num_parents; p++)
++ parent_irqs[p] = of_irq_get(node, p);
+
+- ret = map_interrupts(node, domain);
+- if (ret) {
+- pr_err("invalid interrupt map\n");
+- return ret;
++ if (WARN_ON(!num_parents)) {
++ /*
++ * If DT contains no parent interrupts, assume MIPS CPU IRQ 2
++ * (HW0) is connected to the first output. This is the case for
++ * all known hardware anyway. "interrupt-map" is deprecated, so
++ * don't bother trying to parse that.
++ * Since this is to account for old devicetrees with one-cell
++ * interrupt specifiers, only one output domain is needed.
++ */
++ oirq.np = of_find_compatible_node(NULL, NULL, "mti,cpu-interrupt-controller");
++ if (oirq.np) {
++ oirq.args_count = 1;
++ oirq.args[0] = 2;
++
++ parent_irqs[0] = irq_create_of_mapping(&oirq);
++ num_parents = 1;
++ }
++
++ of_node_put(oirq.np);
+ }
+
+- return 0;
++ /* Ensure we haven't collected any errors before proceeding */
++ for (p = 0; p < num_parents; p++) {
++ if (parent_irqs[p] < 0)
++ return parent_irqs[p];
++ if (!parent_irqs[p])
++ return -ENODEV;
++ }
++
++ return setup_parent_interrupts(node, &parent_irqs[0], num_parents);
+ }
+
+ IRQCHIP_DECLARE(realtek_rtl_intc, "realtek,rtl-intc", realtek_rtl_of_init);
projects / openwrt / openwrt.git / commitdiff