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Date: Thu, 10 Mar 2022 04:21:21 +0900
From: Hector Martin <marcan@...can.st>
To: Thomas Gleixner <tglx@...utronix.de>,
Marc Zyngier <maz@...nel.org>, Rob Herring <robh+dt@...nel.org>
Cc: Hector Martin <marcan@...can.st>, Sven Peter <sven@...npeter.dev>,
Alyssa Rosenzweig <alyssa@...enzweig.io>,
Mark Kettenis <mark.kettenis@...all.nl>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org
Subject: [PATCH v3 5/7] irqchip/apple-aic: Dynamically compute register offsets
This allows us to support AIC variants with different numbers of IRQs
based on capability registers.
Signed-off-by: Hector Martin <marcan@...can.st>
---
drivers/irqchip/irq-apple-aic.c | 72 +++++++++++++++++++++++++--------
1 file changed, 55 insertions(+), 17 deletions(-)
diff --git a/drivers/irqchip/irq-apple-aic.c b/drivers/irqchip/irq-apple-aic.c
index 96480389195d..4b1ba732f476 100644
--- a/drivers/irqchip/irq-apple-aic.c
+++ b/drivers/irqchip/irq-apple-aic.c
@@ -64,7 +64,7 @@
#include <dt-bindings/interrupt-controller/apple-aic.h>
/*
- * AIC registers (MMIO)
+ * AIC v1 registers (MMIO)
*/
#define AIC_INFO 0x0004
@@ -94,16 +94,14 @@
#define AIC_IPI_SELF BIT(31)
#define AIC_TARGET_CPU 0x3000
-#define AIC_SW_SET 0x4000
-#define AIC_SW_CLR 0x4080
-#define AIC_MASK_SET 0x4100
-#define AIC_MASK_CLR 0x4180
#define AIC_CPU_IPI_SET(cpu) (0x5008 + ((cpu) << 7))
#define AIC_CPU_IPI_CLR(cpu) (0x500c + ((cpu) << 7))
#define AIC_CPU_IPI_MASK_SET(cpu) (0x5024 + ((cpu) << 7))
#define AIC_CPU_IPI_MASK_CLR(cpu) (0x5028 + ((cpu) << 7))
+#define AIC_MAX_IRQ 0x400
+
#define MASK_REG(x) (4 * ((x) >> 5))
#define MASK_BIT(x) BIT((x) & GENMASK(4, 0))
@@ -189,17 +187,31 @@ DEFINE_STATIC_KEY_TRUE(use_fast_ipi);
struct aic_info {
int version;
+ /* Register offsets */
+ u32 event;
+ u32 target_cpu;
+ u32 sw_set;
+ u32 sw_clr;
+ u32 mask_set;
+ u32 mask_clr;
+
/* Features */
bool fast_ipi;
};
static const struct aic_info aic1_info = {
.version = 1,
+
+ .event = AIC_EVENT,
+ .target_cpu = AIC_TARGET_CPU,
};
static const struct aic_info aic1_fipi_info = {
.version = 1,
+ .event = AIC_EVENT,
+ .target_cpu = AIC_TARGET_CPU,
+
.fast_ipi = true,
};
@@ -219,7 +231,9 @@ struct aic_irq_chip {
void __iomem *base;
struct irq_domain *hw_domain;
struct irq_domain *ipi_domain;
+
int nr_irq;
+ int max_irq;
struct aic_info info;
};
@@ -254,7 +268,7 @@ static void aic_irq_mask(struct irq_data *d)
u32 irq = AIC_HWIRQ_IRQ(hwirq);
- aic_ic_write(ic, AIC_MASK_SET + MASK_REG(irq), MASK_BIT(irq));
+ aic_ic_write(ic, ic->info.mask_set + MASK_REG(irq), MASK_BIT(irq));
}
static void aic_irq_unmask(struct irq_data *d)
@@ -264,7 +278,7 @@ static void aic_irq_unmask(struct irq_data *d)
u32 irq = AIC_HWIRQ_IRQ(hwirq);
- aic_ic_write(ic, AIC_MASK_CLR + MASK_REG(irq), MASK_BIT(irq));
+ aic_ic_write(ic, ic->info.mask_clr + MASK_REG(irq), MASK_BIT(irq));
}
static void aic_irq_eoi(struct irq_data *d)
@@ -287,7 +301,7 @@ static void __exception_irq_entry aic_handle_irq(struct pt_regs *regs)
* We cannot use a relaxed read here, as reads from DMA buffers
* need to be ordered after the IRQ fires.
*/
- event = readl(ic->base + AIC_EVENT);
+ event = readl(ic->base + ic->info.event);
type = FIELD_GET(AIC_EVENT_TYPE, event);
irq = FIELD_GET(AIC_EVENT_NUM, event);
@@ -319,12 +333,14 @@ static int aic_irq_set_affinity(struct irq_data *d,
struct aic_irq_chip *ic = irq_data_get_irq_chip_data(d);
int cpu;
+ BUG_ON(!ic->info.target_cpu);
+
if (force)
cpu = cpumask_first(mask_val);
else
cpu = cpumask_any_and(mask_val, cpu_online_mask);
- aic_ic_write(ic, AIC_TARGET_CPU + AIC_HWIRQ_IRQ(hwirq) * 4, BIT(cpu));
+ aic_ic_write(ic, ic->info.target_cpu + AIC_HWIRQ_IRQ(hwirq) * 4, BIT(cpu));
irq_data_update_effective_affinity(d, cpumask_of(cpu));
return IRQ_SET_MASK_OK;
@@ -884,8 +900,8 @@ static struct gic_kvm_info vgic_info __initdata = {
static int __init aic_of_ic_init(struct device_node *node, struct device_node *parent)
{
int i;
+ u32 off;
void __iomem *regs;
- u32 info;
struct aic_irq_chip *irqc;
const struct of_device_id *match;
@@ -907,8 +923,30 @@ static int __init aic_of_ic_init(struct device_node *node, struct device_node *p
aic_irqc = irqc;
- info = aic_ic_read(irqc, AIC_INFO);
- irqc->nr_irq = FIELD_GET(AIC_INFO_NR_IRQ, info);
+ switch (irqc->info.version) {
+ case 1: {
+ u32 info;
+
+ info = aic_ic_read(irqc, AIC_INFO);
+ irqc->nr_irq = FIELD_GET(AIC_INFO_NR_IRQ, info);
+ irqc->max_irq = AIC_MAX_IRQ;
+
+ off = irqc->info.target_cpu;
+ off += sizeof(u32) * irqc->max_irq; /* TARGET_CPU */
+
+ break;
+ }
+ }
+
+ irqc->info.sw_set = off;
+ off += sizeof(u32) * (irqc->max_irq >> 5); /* SW_SET */
+ irqc->info.sw_clr = off;
+ off += sizeof(u32) * (irqc->max_irq >> 5); /* SW_CLR */
+ irqc->info.mask_set = off;
+ off += sizeof(u32) * (irqc->max_irq >> 5); /* MASK_SET */
+ irqc->info.mask_clr = off;
+ off += sizeof(u32) * (irqc->max_irq >> 5); /* MASK_CLR */
+ off += sizeof(u32) * (irqc->max_irq >> 5); /* HW_STATE */
if (irqc->info.fast_ipi)
static_branch_enable(&use_fast_ipi);
@@ -936,11 +974,11 @@ static int __init aic_of_ic_init(struct device_node *node, struct device_node *p
set_handle_fiq(aic_handle_fiq);
for (i = 0; i < BITS_TO_U32(irqc->nr_irq); i++)
- aic_ic_write(irqc, AIC_MASK_SET + i * 4, U32_MAX);
+ aic_ic_write(irqc, irqc->info.mask_set + i * 4, U32_MAX);
for (i = 0; i < BITS_TO_U32(irqc->nr_irq); i++)
- aic_ic_write(irqc, AIC_SW_CLR + i * 4, U32_MAX);
+ aic_ic_write(irqc, irqc->info.sw_clr + i * 4, U32_MAX);
for (i = 0; i < irqc->nr_irq; i++)
- aic_ic_write(irqc, AIC_TARGET_CPU + i * 4, 1);
+ aic_ic_write(irqc, irqc->info.target_cpu + i * 4, 1);
if (!is_kernel_in_hyp_mode())
pr_info("Kernel running in EL1, mapping interrupts");
@@ -954,8 +992,8 @@ static int __init aic_of_ic_init(struct device_node *node, struct device_node *p
vgic_set_kvm_info(&vgic_info);
- pr_info("Initialized with %d IRQs, %d FIQs, %d vIPIs\n",
- irqc->nr_irq, AIC_NR_FIQ, AIC_NR_SWIPI);
+ pr_info("Initialized with %d/%d IRQs, %d FIQs, %d vIPIs",
+ irqc->nr_irq, irqc->max_irq, AIC_NR_FIQ, AIC_NR_SWIPI);
return 0;
}
--
2.33.0
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