powerpc/4xx: Create 4xx pseudo-platform in platforms/4xx

We have a lot of code in sysdev for supporting 4xx, ie. either 40x or
44x. Instead it would be cleaner if it was all in platforms/4xx.

This is slightly odd in that we don't actually define any machines in
the 4xx platform, as is usual for a platform directory. But still it
seems like a better result to have all this related code in a directory
by itself.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 0 insertions, 212 deletions

diff --git a/arch/powerpc/sysdev/ppc4xx_hsta_msi.c b/arch/powerpc/sysdev/ppc4xx_hsta_msi.c
deleted file mode 100644
index 9926ad67af76..000000000000
--- a/arch/powerpc/sysdev/ppc4xx_hsta_msi.c
+++ /dev/null
@@ -1,212 +0,0 @@
-/*
- * MSI support for PPC4xx SoCs using High Speed Transfer Assist (HSTA) for
- * generation of the interrupt.
- *
- * Copyright © 2013 Alistair Popple <alistair@popple.id.au> IBM Corporation
- *
- * This program is free software; you can redistribute  it and/or modify it
- * under  the terms of  the GNU General  Public License as published by the
- * Free Software Foundation;  either version 2 of the  License, or (at your
- * option) any later version.
- */
-
-#include <linux/kernel.h>
-#include <linux/interrupt.h>
-#include <linux/msi.h>
-#include <linux/of.h>
-#include <linux/of_platform.h>
-#include <linux/pci.h>
-#include <linux/semaphore.h>
-#include <asm/msi_bitmap.h>
-#include <asm/ppc-pci.h>
-
-struct ppc4xx_hsta_msi {
-	struct device *dev;
-
-	/* The ioremapped HSTA MSI IO space */
-	u32 __iomem *data;
-
-	/* Physical address of HSTA MSI IO space */
-	u64 address;
-	struct msi_bitmap bmp;
-
-	/* An array mapping offsets to hardware IRQs */
-	int *irq_map;
-
-	/* Number of hwirqs supported */
-	int irq_count;
-};
-static struct ppc4xx_hsta_msi ppc4xx_hsta_msi;
-
-static int hsta_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
-{
-	struct msi_msg msg;
-	struct msi_desc *entry;
-	int irq, hwirq;
-	u64 addr;
-
-	/* We don't support MSI-X */
-	if (type == PCI_CAP_ID_MSIX) {
-		pr_debug("%s: MSI-X not supported.\n", __func__);
-		return -EINVAL;
-	}
-
-	for_each_pci_msi_entry(entry, dev) {
-		irq = msi_bitmap_alloc_hwirqs(&ppc4xx_hsta_msi.bmp, 1);
-		if (irq < 0) {
-			pr_debug("%s: Failed to allocate msi interrupt\n",
-				 __func__);
-			return irq;
-		}
-
-		hwirq = ppc4xx_hsta_msi.irq_map[irq];
-		if (!hwirq) {
-			pr_err("%s: Failed mapping irq %d\n", __func__, irq);
-			return -EINVAL;
-		}
-
-		/*
-		 * HSTA generates interrupts on writes to 128-bit aligned
-		 * addresses.
-		 */
-		addr = ppc4xx_hsta_msi.address + irq*0x10;
-		msg.address_hi = upper_32_bits(addr);
-		msg.address_lo = lower_32_bits(addr);
-
-		/* Data is not used by the HSTA. */
-		msg.data = 0;
-
-		pr_debug("%s: Setup irq %d (0x%0llx)\n", __func__, hwirq,
-			 (((u64) msg.address_hi) << 32) | msg.address_lo);
-
-		if (irq_set_msi_desc(hwirq, entry)) {
-			pr_err(
-			"%s: Invalid hwirq %d specified in device tree\n",
-			__func__, hwirq);
-			msi_bitmap_free_hwirqs(&ppc4xx_hsta_msi.bmp, irq, 1);
-			return -EINVAL;
-		}
-		pci_write_msi_msg(hwirq, &msg);
-	}
-
-	return 0;
-}
-
-static int hsta_find_hwirq_offset(int hwirq)
-{
-	int irq;
-
-	/* Find the offset given the hwirq */
-	for (irq = 0; irq < ppc4xx_hsta_msi.irq_count; irq++)
-		if (ppc4xx_hsta_msi.irq_map[irq] == hwirq)
-			return irq;
-
-	return -EINVAL;
-}
-
-static void hsta_teardown_msi_irqs(struct pci_dev *dev)
-{
-	struct msi_desc *entry;
-	int irq;
-
-	for_each_pci_msi_entry(entry, dev) {
-		if (!entry->irq)
-			continue;
-
-		irq = hsta_find_hwirq_offset(entry->irq);
-
-		/* entry->irq should always be in irq_map */
-		BUG_ON(irq < 0);
-		irq_set_msi_desc(entry->irq, NULL);
-		msi_bitmap_free_hwirqs(&ppc4xx_hsta_msi.bmp, irq, 1);
-		pr_debug("%s: Teardown IRQ %u (index %u)\n", __func__,
-			 entry->irq, irq);
-	}
-}
-
-static int hsta_msi_probe(struct platform_device *pdev)
-{
-	struct device *dev = &pdev->dev;
-	struct resource *mem;
-	int irq, ret, irq_count;
-	struct pci_controller *phb;
-
-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!mem) {
-		dev_err(dev, "Unable to get mmio space\n");
-		return -EINVAL;
-	}
-
-	irq_count = of_irq_count(dev->of_node);
-	if (!irq_count) {
-		dev_err(dev, "Unable to find IRQ range\n");
-		return -EINVAL;
-	}
-
-	ppc4xx_hsta_msi.dev = dev;
-	ppc4xx_hsta_msi.address = mem->start;
-	ppc4xx_hsta_msi.data = ioremap(mem->start, resource_size(mem));
-	ppc4xx_hsta_msi.irq_count = irq_count;
-	if (!ppc4xx_hsta_msi.data) {
-		dev_err(dev, "Unable to map memory\n");
-		return -ENOMEM;
-	}
-
-	ret = msi_bitmap_alloc(&ppc4xx_hsta_msi.bmp, irq_count, dev->of_node);
-	if (ret)
-		goto out;
-
-	ppc4xx_hsta_msi.irq_map = kmalloc(sizeof(int) * irq_count, GFP_KERNEL);
-	if (!ppc4xx_hsta_msi.irq_map) {
-		ret = -ENOMEM;
-		goto out1;
-	}
-
-	/* Setup a mapping from irq offsets to hardware irq numbers */
-	for (irq = 0; irq < irq_count; irq++) {
-		ppc4xx_hsta_msi.irq_map[irq] =
-			irq_of_parse_and_map(dev->of_node, irq);
-		if (!ppc4xx_hsta_msi.irq_map[irq]) {
-			dev_err(dev, "Unable to map IRQ\n");
-			ret = -EINVAL;
-			goto out2;
-		}
-	}
-
-	list_for_each_entry(phb, &hose_list, list_node) {
-		phb->controller_ops.setup_msi_irqs = hsta_setup_msi_irqs;
-		phb->controller_ops.teardown_msi_irqs = hsta_teardown_msi_irqs;
-	}
-	return 0;
-
-out2:
-	kfree(ppc4xx_hsta_msi.irq_map);
-
-out1:
-	msi_bitmap_free(&ppc4xx_hsta_msi.bmp);
-
-out:
-	iounmap(ppc4xx_hsta_msi.data);
-	return ret;
-}
-
-static const struct of_device_id hsta_msi_ids[] = {
-	{
-		.compatible = "ibm,hsta-msi",
-	},
-	{}
-};
-
-static struct platform_driver hsta_msi_driver = {
-	.probe = hsta_msi_probe,
-	.driver = {
-		.name = "hsta-msi",
-		.of_match_table = hsta_msi_ids,
-	},
-};
-
-static int hsta_msi_init(void)
-{
-	return platform_driver_register(&hsta_msi_driver);
-}
-subsys_initcall(hsta_msi_init);