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openwrt-owl/target/linux/ath79/patches-4.14/0021-MIPS-ath79-turn-pci-ar...

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From 0e7f36bfd68401e8c42933e7f770f270497bb9a8 Mon Sep 17 00:00:00 2001
From: John Crispin <john@phrozen.org>
Date: Tue, 6 Mar 2018 09:23:25 +0100
Subject: [PATCH 21/27] MIPS: ath79: turn pci-ar724x driver into a pure OF
driver
Signed-off-by: John Crispin <john@phrozen.org>
---
arch/mips/pci/pci-ar724x.c | 86 +++++++++++++++++++++-------------------------
1 file changed, 40 insertions(+), 46 deletions(-)
--- a/arch/mips/pci/pci-ar724x.c
+++ b/arch/mips/pci/pci-ar724x.c
@@ -14,8 +14,11 @@
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
+#include <linux/irqchip/chained_irq.h>
#include <asm/mach-ath79/ath79.h>
#include <asm/mach-ath79/ar71xx_regs.h>
+#include <linux/of_irq.h>
+#include <linux/of_pci.h>
#define AR724X_PCI_REG_APP 0x00
#define AR724X_PCI_REG_RESET 0x18
@@ -45,17 +48,20 @@ struct ar724x_pci_controller {
void __iomem *crp_base;
int irq;
- int irq_base;
bool link_up;
bool bar0_is_cached;
u32 bar0_value;
+ struct device_node *np;
struct pci_controller pci_controller;
+ struct irq_domain *domain;
struct resource io_res;
struct resource mem_res;
};
+static struct irq_chip ar724x_pci_irq_chip;
+
static inline bool ar724x_pci_check_link(struct ar724x_pci_controller *apc)
{
u32 reset;
@@ -231,35 +237,31 @@ static struct pci_ops ar724x_pci_ops = {
static void ar724x_pci_irq_handler(struct irq_desc *desc)
{
- struct ar724x_pci_controller *apc;
- void __iomem *base;
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ struct ar724x_pci_controller *apc = irq_desc_get_handler_data(desc);
u32 pending;
- apc = irq_desc_get_handler_data(desc);
- base = apc->ctrl_base;
-
- pending = __raw_readl(base + AR724X_PCI_REG_INT_STATUS) &
- __raw_readl(base + AR724X_PCI_REG_INT_MASK);
+ chained_irq_enter(chip, desc);
+ pending = __raw_readl(apc->ctrl_base + AR724X_PCI_REG_INT_STATUS) &
+ __raw_readl(apc->ctrl_base + AR724X_PCI_REG_INT_MASK);
if (pending & AR724X_PCI_INT_DEV0)
- generic_handle_irq(apc->irq_base + 0);
-
+ generic_handle_irq(irq_linear_revmap(apc->domain, 1));
else
spurious_interrupt();
+ chained_irq_exit(chip, desc);
}
static void ar724x_pci_irq_unmask(struct irq_data *d)
{
struct ar724x_pci_controller *apc;
void __iomem *base;
- int offset;
u32 t;
apc = irq_data_get_irq_chip_data(d);
base = apc->ctrl_base;
- offset = apc->irq_base - d->irq;
- switch (offset) {
+ switch (irq_linear_revmap(apc->domain, d->irq)) {
case 0:
t = __raw_readl(base + AR724X_PCI_REG_INT_MASK);
__raw_writel(t | AR724X_PCI_INT_DEV0,
@@ -273,14 +275,12 @@ static void ar724x_pci_irq_mask(struct i
{
struct ar724x_pci_controller *apc;
void __iomem *base;
- int offset;
u32 t;
apc = irq_data_get_irq_chip_data(d);
base = apc->ctrl_base;
- offset = apc->irq_base - d->irq;
- switch (offset) {
+ switch (irq_linear_revmap(apc->domain, d->irq)) {
case 0:
t = __raw_readl(base + AR724X_PCI_REG_INT_MASK);
__raw_writel(t & ~AR724X_PCI_INT_DEV0,
@@ -305,26 +305,32 @@ static struct irq_chip ar724x_pci_irq_ch
.irq_mask_ack = ar724x_pci_irq_mask,
};
+static int ar724x_pci_irq_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
+{
+ struct ar724x_pci_controller *apc = d->host_data;
+
+ irq_set_chip_and_handler(irq, &ar724x_pci_irq_chip, handle_level_irq);
+ irq_set_chip_data(irq, apc);
+
+ return 0;
+}
+
+static const struct irq_domain_ops ar724x_pci_domain_ops = {
+ .xlate = irq_domain_xlate_onecell,
+ .map = ar724x_pci_irq_map,
+};
+
static void ar724x_pci_irq_init(struct ar724x_pci_controller *apc,
int id)
{
void __iomem *base;
- int i;
base = apc->ctrl_base;
__raw_writel(0, base + AR724X_PCI_REG_INT_MASK);
__raw_writel(0, base + AR724X_PCI_REG_INT_STATUS);
- apc->irq_base = ATH79_PCI_IRQ_BASE + (id * AR724X_PCI_IRQ_COUNT);
-
- for (i = apc->irq_base;
- i < apc->irq_base + AR724X_PCI_IRQ_COUNT; i++) {
- irq_set_chip_and_handler(i, &ar724x_pci_irq_chip,
- handle_level_irq);
- irq_set_chip_data(i, apc);
- }
-
+ apc->domain = irq_domain_add_linear(apc->np, 2, &ar724x_pci_domain_ops, apc);
irq_set_chained_handler_and_data(apc->irq, ar724x_pci_irq_handler,
apc);
}
@@ -394,29 +400,11 @@ static int ar724x_pci_probe(struct platf
if (apc->irq < 0)
return -EINVAL;
- res = platform_get_resource_byname(pdev, IORESOURCE_IO, "io_base");
- if (!res)
- return -EINVAL;
-
- apc->io_res.parent = res;
- apc->io_res.name = "PCI IO space";
- apc->io_res.start = res->start;
- apc->io_res.end = res->end;
- apc->io_res.flags = IORESOURCE_IO;
-
- res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mem_base");
- if (!res)
- return -EINVAL;
-
- apc->mem_res.parent = res;
- apc->mem_res.name = "PCI memory space";
- apc->mem_res.start = res->start;
- apc->mem_res.end = res->end;
- apc->mem_res.flags = IORESOURCE_MEM;
-
+ apc->np = pdev->dev.of_node;
apc->pci_controller.pci_ops = &ar724x_pci_ops;
apc->pci_controller.io_resource = &apc->io_res;
apc->pci_controller.mem_resource = &apc->mem_res;
+ pci_load_of_ranges(&apc->pci_controller, pdev->dev.of_node);
/*
* Do the full PCIE Root Complex Initialization Sequence if the PCIe
@@ -438,10 +426,16 @@ static int ar724x_pci_probe(struct platf
return 0;
}
+static const struct of_device_id ar724x_pci_ids[] = {
+ { .compatible = "qcom,ar7240-pci" },
+ {},
+};
+
static struct platform_driver ar724x_pci_driver = {
.probe = ar724x_pci_probe,
.driver = {
.name = "ar724x-pci",
+ .of_match_table = of_match_ptr(ar724x_pci_ids),
},
};
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