From f55b2b56cd37fa8bcfcb75248c27094eaf09e04c Mon Sep 17 00:00:00 2001
From: Linus Walleij <linus.walleij@linaro.org>
Date: Fri, 1 Mar 2013 02:20:55 +0100
Subject: ARM: integrator: basic PCIv3 device tree support

This registers the memory ranges for I/O, non-prefetched and
prefetched memory and configuration space for the PCIv3 bridge
and let us fetch these basic memory resources from the device
tree in the device tree boot path. Remove the stepping stone
platform device. This is an either/or approach - the platform
data path is mutually exclusive to the plain platform data
path and provided addresses from the device tree have to be
correct.

This adds the interrupt-map property to the PCIv3 DTS file
and makes the bridge obtain mappings from the device tree.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 arch/arm/mach-integrator/pci_v3.c | 177 ++++++++++++++++++++++++++++++++------
 1 file changed, 152 insertions(+), 25 deletions(-)

(limited to 'arch/arm/mach-integrator/pci_v3.c')

diff --git a/arch/arm/mach-integrator/pci_v3.c b/arch/arm/mach-integrator/pci_v3.c
index a3cefdebd136..a0e069d37e14 100644
--- a/arch/arm/mach-integrator/pci_v3.c
+++ b/arch/arm/mach-integrator/pci_v3.c
@@ -28,6 +28,10 @@
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_pci.h>
 #include <video/vga.h>
 
 #include <mach/hardware.h>
@@ -279,7 +283,12 @@
  * the mappings into PCI memory.
  */
 
+/* Filled in by probe */
 static void __iomem *pci_v3_base;
+static struct resource conf_mem; /* FIXME: remap this instead of static map */
+static struct resource io_mem;
+static struct resource non_mem;
+static struct resource pre_mem;
 
 // V3 access routines
 #define v3_writeb(o,v) __raw_writeb(v, pci_v3_base + (unsigned int)(o))
@@ -423,13 +432,13 @@ static void __iomem *v3_open_config_window(struct pci_bus *bus,
 	 * prefetchable), this frees up base1 for re-use by
 	 * configuration memory
 	 */
-	v3_writel(V3_LB_BASE0, v3_addr_to_lb_base(PHYS_PCI_MEM_BASE) |
+	v3_writel(V3_LB_BASE0, v3_addr_to_lb_base(non_mem.start) |
 			V3_LB_BASE_ADR_SIZE_512MB | V3_LB_BASE_ENABLE);
 
 	/*
 	 * Set up base1/map1 to point into configuration space.
 	 */
-	v3_writel(V3_LB_BASE1, v3_addr_to_lb_base(PHYS_PCI_CONFIG_BASE) |
+	v3_writel(V3_LB_BASE1, v3_addr_to_lb_base(conf_mem.start) |
 			V3_LB_BASE_ADR_SIZE_16MB | V3_LB_BASE_ENABLE);
 	v3_writew(V3_LB_MAP1, mapaddress);
 
@@ -441,7 +450,7 @@ static void v3_close_config_window(void)
 	/*
 	 * Reassign base1 for use by prefetchable PCI memory
 	 */
-	v3_writel(V3_LB_BASE1, v3_addr_to_lb_base(PHYS_PCI_MEM_BASE + SZ_256M) |
+	v3_writel(V3_LB_BASE1, v3_addr_to_lb_base(pre_mem.start) |
 			V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_PREFETCH |
 			V3_LB_BASE_ENABLE);
 	v3_writew(V3_LB_MAP1, v3_addr_to_lb_map(PCI_BUS_PREMEM_START) |
@@ -450,7 +459,7 @@ static void v3_close_config_window(void)
 	/*
 	 * And shrink base0 back to a 256M window (NOTE: MAP0 already correct)
 	 */
-	v3_writel(V3_LB_BASE0, v3_addr_to_lb_base(PHYS_PCI_MEM_BASE) |
+	v3_writel(V3_LB_BASE0, v3_addr_to_lb_base(non_mem.start) |
 			V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_ENABLE);
 }
 
@@ -522,20 +531,6 @@ static struct pci_ops pci_v3_ops = {
 	.write	= v3_write_config,
 };
 
-static struct resource non_mem = {
-	.name	= "PCI non-prefetchable",
-	.start	= PHYS_PCI_MEM_BASE + PCI_BUS_NONMEM_START,
-	.end	= PHYS_PCI_MEM_BASE + PCI_BUS_NONMEM_START + PCI_BUS_NONMEM_SIZE - 1,
-	.flags	= IORESOURCE_MEM,
-};
-
-static struct resource pre_mem = {
-	.name	= "PCI prefetchable",
-	.start	= PHYS_PCI_MEM_BASE + PCI_BUS_PREMEM_START,
-	.end	= PHYS_PCI_MEM_BASE + PCI_BUS_PREMEM_START + PCI_BUS_PREMEM_SIZE - 1,
-	.flags	= IORESOURCE_MEM | IORESOURCE_PREFETCH,
-};
-
 static int __init pci_v3_setup_resources(struct pci_sys_data *sys)
 {
 	if (request_resource(&iomem_resource, &non_mem)) {
@@ -659,7 +654,7 @@ static int __init pci_v3_setup(int nr, struct pci_sys_data *sys)
 		return -EINVAL;
 
 	if (nr == 0) {
-		sys->mem_offset = PHYS_PCI_MEM_BASE;
+		sys->mem_offset = non_mem.start;
 		ret = pci_v3_setup_resources(sys);
 	}
 
@@ -697,7 +692,7 @@ static void __init pci_v3_preinit(void)
 	 * Setup window 0 - PCI non-prefetchable memory
 	 *  Local: 0x40000000 Bus: 0x00000000 Size: 256MB
 	 */
-	v3_writel(V3_LB_BASE0, v3_addr_to_lb_base(PHYS_PCI_MEM_BASE) |
+	v3_writel(V3_LB_BASE0, v3_addr_to_lb_base(non_mem.start) |
 			V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_ENABLE);
 	v3_writew(V3_LB_MAP0, v3_addr_to_lb_map(PCI_BUS_NONMEM_START) |
 			V3_LB_MAP_TYPE_MEM);
@@ -706,7 +701,7 @@ static void __init pci_v3_preinit(void)
 	 * Setup window 1 - PCI prefetchable memory
 	 *  Local: 0x50000000 Bus: 0x10000000 Size: 256MB
 	 */
-	v3_writel(V3_LB_BASE1, v3_addr_to_lb_base(PHYS_PCI_MEM_BASE + SZ_256M) |
+	v3_writel(V3_LB_BASE1, v3_addr_to_lb_base(pre_mem.start) |
 			V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_PREFETCH |
 			V3_LB_BASE_ENABLE);
 	v3_writew(V3_LB_MAP1, v3_addr_to_lb_map(PCI_BUS_PREMEM_START) |
@@ -715,7 +710,7 @@ static void __init pci_v3_preinit(void)
 	/*
 	 * Setup window 2 - PCI IO
 	 */
-	v3_writel(V3_LB_BASE2, v3_addr_to_lb_base2(PHYS_PCI_IO_BASE) |
+	v3_writel(V3_LB_BASE2, v3_addr_to_lb_base2(io_mem.start) |
 			V3_LB_BASE_ENABLE);
 	v3_writew(V3_LB_MAP2, v3_addr_to_lb_map2(0));
 
@@ -772,7 +767,7 @@ static void __init pci_v3_postinit(void)
 		       "interrupt: %d\n", ret);
 #endif
 
-	register_isa_ports(PHYS_PCI_MEM_BASE, PHYS_PCI_IO_BASE, 0);
+	register_isa_ports(non_mem.start, io_mem.start, 0);
 }
 
 /*
@@ -837,7 +832,6 @@ static int __init pci_v3_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 
 static struct hw_pci pci_v3 __initdata = {
 	.swizzle		= pci_v3_swizzle,
-	.map_irq		= pci_v3_map_irq,
 	.setup			= pci_v3_setup,
 	.nr_controllers		= 1,
 	.ops			= &pci_v3_ops,
@@ -845,8 +839,107 @@ static struct hw_pci pci_v3 __initdata = {
 	.postinit		= pci_v3_postinit,
 };
 
+#ifdef CONFIG_OF
+
+static int __init pci_v3_map_irq_dt(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+	struct of_irq oirq;
+	int ret;
+
+	ret = of_irq_map_pci(dev, &oirq);
+	if (ret) {
+		dev_err(&dev->dev, "of_irq_map_pci() %d\n", ret);
+		/* Proper return code 0 == NO_IRQ */
+		return 0;
+	}
+
+	return irq_create_of_mapping(oirq.controller, oirq.specifier,
+				     oirq.size);
+}
+
+static int __init pci_v3_dtprobe(struct platform_device *pdev,
+				struct device_node *np)
+{
+	struct of_pci_range_parser parser;
+	struct of_pci_range range;
+	struct resource *res;
+	int irq, ret;
+
+	if (of_pci_range_parser_init(&parser, np))
+		return -EINVAL;
+
+	/* Get base for bridge registers */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "unable to obtain PCIv3 base\n");
+		return -ENODEV;
+	}
+	pci_v3_base = devm_ioremap(&pdev->dev, res->start,
+				   resource_size(res));
+	if (!pci_v3_base) {
+		dev_err(&pdev->dev, "unable to remap PCIv3 base\n");
+		return -ENODEV;
+	}
+
+	/* Get and request error IRQ resource */
+	irq = platform_get_irq(pdev, 0);
+	if (irq <= 0) {
+		dev_err(&pdev->dev, "unable to obtain PCIv3 error IRQ\n");
+		return -ENODEV;
+	}
+	ret = devm_request_irq(&pdev->dev, irq, v3_irq, 0,
+			"PCIv3 error", NULL);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "unable to request PCIv3 error IRQ %d (%d)\n", irq, ret);
+		return ret;
+	}
+
+	for_each_of_pci_range(&parser, &range) {
+		if (!range.flags) {
+			of_pci_range_to_resource(&range, np, &conf_mem);
+			conf_mem.name = "PCIv3 config";
+		}
+		if (range.flags & IORESOURCE_IO) {
+			of_pci_range_to_resource(&range, np, &io_mem);
+			io_mem.name = "PCIv3 I/O";
+		}
+		if ((range.flags & IORESOURCE_MEM) &&
+			!(range.flags & IORESOURCE_PREFETCH)) {
+			of_pci_range_to_resource(&range, np, &non_mem);
+			non_mem.name = "PCIv3 non-prefetched mem";
+		}
+		if ((range.flags & IORESOURCE_MEM) &&
+			(range.flags & IORESOURCE_PREFETCH)) {
+			of_pci_range_to_resource(&range, np, &pre_mem);
+			pre_mem.name = "PCIv3 prefetched mem";
+		}
+	}
+
+	if (!conf_mem.start || !io_mem.start ||
+	    !non_mem.start || !pre_mem.start) {
+		dev_err(&pdev->dev, "missing ranges in device node\n");
+		return -EINVAL;
+	}
+
+	pci_v3.map_irq = pci_v3_map_irq_dt;
+	pci_common_init_dev(&pdev->dev, &pci_v3);
+
+	return 0;
+}
+
+#else
+
+static inline int pci_v3_dtprobe(struct platform_device *pdev,
+				  struct device_node *np)
+{
+	return -EINVAL;
+}
+
+#endif
+
 static int __init pci_v3_probe(struct platform_device *pdev)
 {
+	struct device_node *np = pdev->dev.of_node;
 	int ret;
 
 	/* Remap the Integrator system controller */
@@ -856,6 +949,10 @@ static int __init pci_v3_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
+	/* Device tree probe path */
+	if (np)
+		return pci_v3_dtprobe(pdev, np);
+
 	pci_v3_base = devm_ioremap(&pdev->dev, PHYS_PCI_V3_BASE, SZ_64K);
 	if (!pci_v3_base) {
 		dev_err(&pdev->dev, "unable to remap PCIv3 base\n");
@@ -869,14 +966,44 @@ static int __init pci_v3_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	pci_common_init(&pci_v3);
+	conf_mem.name = "PCIv3 config";
+	conf_mem.start = PHYS_PCI_CONFIG_BASE;
+	conf_mem.end = PHYS_PCI_CONFIG_BASE + SZ_16M - 1;
+	conf_mem.flags = IORESOURCE_MEM;
+
+	io_mem.name = "PCIv3 I/O";
+	io_mem.start = PHYS_PCI_IO_BASE;
+	io_mem.end = PHYS_PCI_IO_BASE + SZ_16M - 1;
+	io_mem.flags = IORESOURCE_MEM;
+
+	non_mem.name = "PCIv3 non-prefetched mem";
+	non_mem.start = PHYS_PCI_MEM_BASE + PCI_BUS_NONMEM_START;
+	non_mem.end = PHYS_PCI_MEM_BASE + PCI_BUS_NONMEM_START +
+		PCI_BUS_NONMEM_SIZE - 1;
+	non_mem.flags = IORESOURCE_MEM;
+
+	pre_mem.name = "PCIv3 prefetched mem";
+	pre_mem.start = PHYS_PCI_MEM_BASE + PCI_BUS_PREMEM_START;
+	pre_mem.end = PHYS_PCI_MEM_BASE + PCI_BUS_PREMEM_START +
+		PCI_BUS_PREMEM_SIZE - 1;
+	pre_mem.flags = IORESOURCE_MEM | IORESOURCE_PREFETCH;
+
+	pci_v3.map_irq = pci_v3_map_irq;
+
+	pci_common_init_dev(&pdev->dev, &pci_v3);
 
 	return 0;
 }
 
+static const struct of_device_id pci_ids[] = {
+	{ .compatible = "v3,v360epc-pci", },
+	{},
+};
+
 static struct platform_driver pci_v3_driver = {
 	.driver = {
 		.name = "pci-v3",
+		.of_match_table = pci_ids,
 	},
 };
 
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