1 files changed, 393 insertions, 0 deletions
diff --git a/arch/unicore32/kernel/pci.c b/arch/unicore32/kernel/pci.c
new file mode 100644
index 00000000000..374a055a8e6
--- /dev/null
+++ b/arch/unicore32/kernel/pci.c
@@ -0,0 +1,393 @@
+/*
+ * linux/arch/unicore32/kernel/pci.c
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  PCI bios-type initialisation for PCI machines
+ *
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/io.h>
+
+static int debug_pci;
+
+#define CONFIG_CMD(bus, devfn, where)	\
+	(0x80000000 | (bus->number << 16) | (devfn << 8) | (where & ~3))
+
+static int
+puv3_read_config(struct pci_bus *bus, unsigned int devfn, int where,
+			int size, u32 *value)
+{
+	writel(CONFIG_CMD(bus, devfn, where), PCICFG_ADDR);
+	switch (size) {
+	case 1:
+		*value = (readl(PCICFG_DATA) >> ((where & 3) * 8)) & 0xFF;
+		break;
+	case 2:
+		*value = (readl(PCICFG_DATA) >> ((where & 2) * 8)) & 0xFFFF;
+		break;
+	case 4:
+		*value = readl(PCICFG_DATA);
+		break;
+	}
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int
+puv3_write_config(struct pci_bus *bus, unsigned int devfn, int where,
+			int size, u32 value)
+{
+	writel(CONFIG_CMD(bus, devfn, where), PCICFG_ADDR);
+	switch (size) {
+	case 1:
+		writel((readl(PCICFG_DATA) & ~FMASK(8, (where&3)*8))
+			| FIELD(value, 8, (where&3)*8), PCICFG_DATA);
+		break;
+	case 2:
+		writel((readl(PCICFG_DATA) & ~FMASK(16, (where&2)*8))
+			| FIELD(value, 16, (where&2)*8), PCICFG_DATA);
+		break;
+	case 4:
+		writel(value, PCICFG_DATA);
+		break;
+	}
+	return PCIBIOS_SUCCESSFUL;
+}
+
+struct pci_ops pci_puv3_ops = {
+	.read  = puv3_read_config,
+	.write = puv3_write_config,
+};
+
+void pci_puv3_preinit(void)
+{
+	printk(KERN_DEBUG "PCI: PKUnity PCI Controller Initializing ...\n");
+	/* config PCI bridge base */
+	writel(io_v2p(PKUNITY_PCIBRI_BASE), PCICFG_BRIBASE);
+
+	writel(0, PCIBRI_AHBCTL0);
+	writel(io_v2p(PKUNITY_PCIBRI_BASE) | PCIBRI_BARx_MEM, PCIBRI_AHBBAR0);
+	writel(0xFFFF0000, PCIBRI_AHBAMR0);
+	writel(0, PCIBRI_AHBTAR0);
+
+	writel(PCIBRI_CTLx_AT, PCIBRI_AHBCTL1);
+	writel(io_v2p(PKUNITY_PCILIO_BASE) | PCIBRI_BARx_IO, PCIBRI_AHBBAR1);
+	writel(0xFFFF0000, PCIBRI_AHBAMR1);
+	writel(0x00000000, PCIBRI_AHBTAR1);
+
+	writel(PCIBRI_CTLx_PREF, PCIBRI_AHBCTL2);
+	writel(io_v2p(PKUNITY_PCIMEM_BASE) | PCIBRI_BARx_MEM, PCIBRI_AHBBAR2);
+	writel(0xF8000000, PCIBRI_AHBAMR2);
+	writel(0, PCIBRI_AHBTAR2);
+
+	writel(io_v2p(PKUNITY_PCIAHB_BASE) | PCIBRI_BARx_MEM, PCIBRI_BAR1);
+
+	writel(PCIBRI_CTLx_AT | PCIBRI_CTLx_PREF, PCIBRI_PCICTL0);
+	writel(io_v2p(PKUNITY_PCIAHB_BASE) | PCIBRI_BARx_MEM, PCIBRI_PCIBAR0);
+	writel(0xF8000000, PCIBRI_PCIAMR0);
+	writel(PKUNITY_SDRAM_BASE, PCIBRI_PCITAR0);
+
+	writel(readl(PCIBRI_CMD) | PCIBRI_CMD_IO | PCIBRI_CMD_MEM, PCIBRI_CMD);
+}
+
+static int __init pci_puv3_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+	if (dev->bus->number == 0) {
+#ifdef CONFIG_ARCH_FPGA /* 4 pci slots */
+		if      (dev->devfn == 0x00)
+			return IRQ_PCIINTA;
+		else if (dev->devfn == 0x08)
+			return IRQ_PCIINTB;
+		else if (dev->devfn == 0x10)
+			return IRQ_PCIINTC;
+		else if (dev->devfn == 0x18)
+			return IRQ_PCIINTD;
+#endif
+#ifdef CONFIG_PUV3_DB0913 /* 3 pci slots */
+		if      (dev->devfn == 0x30)
+			return IRQ_PCIINTB;
+		else if (dev->devfn == 0x60)
+			return IRQ_PCIINTC;
+		else if (dev->devfn == 0x58)
+			return IRQ_PCIINTD;
+#endif
+#if	defined(CONFIG_PUV3_NB0916) || defined(CONFIG_PUV3_SMW0919)
+		/* only support 2 pci devices */
+		if      (dev->devfn == 0x00)
+			return IRQ_PCIINTC; /* sata */
+#endif
+	}
+	return -1;
+}
+
+/*
+ * Only first 128MB of memory can be accessed via PCI.
+ * We use GFP_DMA to allocate safe buffers to do map/unmap.
+ * This is really ugly and we need a better way of specifying
+ * DMA-capable regions of memory.
+ */
+void __init puv3_pci_adjust_zones(unsigned long *zone_size,
+	unsigned long *zhole_size)
+{
+	unsigned int sz = SZ_128M >> PAGE_SHIFT;
+
+	/*
+	 * Only adjust if > 128M on current system
+	 */
+	if (zone_size[0] <= sz)
+		return;
+
+	zone_size[1] = zone_size[0] - sz;
+	zone_size[0] = sz;
+	zhole_size[1] = zhole_size[0];
+	zhole_size[0] = 0;
+}
+
+/*
+ * If the bus contains any of these devices, then we must not turn on
+ * parity checking of any kind.
+ */
+static inline int pdev_bad_for_parity(struct pci_dev *dev)
+{
+	return 0;
+}
+
+/*
+ * pcibios_fixup_bus - Called after each bus is probed,
+ * but before its children are examined.
+ */
+void pcibios_fixup_bus(struct pci_bus *bus)
+{
+	struct pci_dev *dev;
+	u16 features = PCI_COMMAND_SERR
+		| PCI_COMMAND_PARITY
+		| PCI_COMMAND_FAST_BACK;
+
+	bus->resource[0] = &ioport_resource;
+	bus->resource[1] = &iomem_resource;
+
+	/*
+	 * Walk the devices on this bus, working out what we can
+	 * and can't support.
+	 */
+	list_for_each_entry(dev, &bus->devices, bus_list) {
+		u16 status;
+
+		pci_read_config_word(dev, PCI_STATUS, &status);
+
+		/*
+		 * If any device on this bus does not support fast back
+		 * to back transfers, then the bus as a whole is not able
+		 * to support them.  Having fast back to back transfers
+		 * on saves us one PCI cycle per transaction.
+		 */
+		if (!(status & PCI_STATUS_FAST_BACK))
+			features &= ~PCI_COMMAND_FAST_BACK;
+
+		if (pdev_bad_for_parity(dev))
+			features &= ~(PCI_COMMAND_SERR
+					| PCI_COMMAND_PARITY);
+
+		switch (dev->class >> 8) {
+		case PCI_CLASS_BRIDGE_PCI:
+			pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &status);
+			status |= PCI_BRIDGE_CTL_PARITY
+				| PCI_BRIDGE_CTL_MASTER_ABORT;
+			status &= ~(PCI_BRIDGE_CTL_BUS_RESET
+				| PCI_BRIDGE_CTL_FAST_BACK);
+			pci_write_config_word(dev, PCI_BRIDGE_CONTROL, status);
+			break;
+
+		case PCI_CLASS_BRIDGE_CARDBUS:
+			pci_read_config_word(dev, PCI_CB_BRIDGE_CONTROL,
+					&status);
+			status |= PCI_CB_BRIDGE_CTL_PARITY
+				| PCI_CB_BRIDGE_CTL_MASTER_ABORT;
+			pci_write_config_word(dev, PCI_CB_BRIDGE_CONTROL,
+					status);
+			break;
+		}
+	}
+
+	/*
+	 * Now walk the devices again, this time setting them up.
+	 */
+	list_for_each_entry(dev, &bus->devices, bus_list) {
+		u16 cmd;
+
+		pci_read_config_word(dev, PCI_COMMAND, &cmd);
+		cmd |= features;
+		pci_write_config_word(dev, PCI_COMMAND, cmd);
+
+		pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
+				      L1_CACHE_BYTES >> 2);
+	}
+
+	/*
+	 * Propagate the flags to the PCI bridge.
+	 */
+	if (bus->self && bus->self->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
+		if (features & PCI_COMMAND_FAST_BACK)
+			bus->bridge_ctl |= PCI_BRIDGE_CTL_FAST_BACK;
+		if (features & PCI_COMMAND_PARITY)
+			bus->bridge_ctl |= PCI_BRIDGE_CTL_PARITY;
+	}
+
+	/*
+	 * Report what we did for this bus
+	 */
+	printk(KERN_INFO "PCI: bus%d: Fast back to back transfers %sabled\n",
+		bus->number, (features & PCI_COMMAND_FAST_BACK) ? "en" : "dis");
+}
+EXPORT_SYMBOL(pcibios_fixup_bus);
+
+static int __init pci_common_init(void)
+{
+	struct pci_bus *puv3_bus;
+
+	pci_puv3_preinit();
+
+	puv3_bus = pci_scan_bus(0, &pci_puv3_ops, NULL);
+
+	if (!puv3_bus)
+		panic("PCI: unable to scan bus!");
+
+	pci_fixup_irqs(pci_common_swizzle, pci_puv3_map_irq);
+
+	if (!pci_has_flag(PCI_PROBE_ONLY)) {
+		/*
+		 * Size the bridge windows.
+		 */
+		pci_bus_size_bridges(puv3_bus);
+
+		/*
+		 * Assign resources.
+		 */
+		pci_bus_assign_resources(puv3_bus);
+	}
+
+	return 0;
+}
+subsys_initcall(pci_common_init);
+
+char * __init pcibios_setup(char *str)
+{
+	if (!strcmp(str, "debug")) {
+		debug_pci = 1;
+		return NULL;
+	} else if (!strcmp(str, "firmware")) {
+		pci_add_flags(PCI_PROBE_ONLY);
+		return NULL;
+	}
+	return str;
+}
+
+void pcibios_set_master(struct pci_dev *dev)
+{
+	/* No special bus mastering setup handling */
+}
+
+/*
+ * From arch/i386/kernel/pci-i386.c:
+ *
+ * We need to avoid collisions with `mirrored' VGA ports
+ * and other strange ISA hardware, so we always want the
+ * addresses to be allocated in the 0x000-0x0ff region
+ * modulo 0x400.
+ *
+ * Why? Because some silly external IO cards only decode
+ * the low 10 bits of the IO address. The 0x00-0xff region
+ * is reserved for motherboard devices that decode all 16
+ * bits, so it's ok to allocate at, say, 0x2800-0x28ff,
+ * but we want to try to avoid allocating at 0x2900-0x2bff
+ * which might be mirrored at 0x0100-0x03ff..
+ */
+resource_size_t pcibios_align_resource(void *data, const struct resource *res,
+				resource_size_t size, resource_size_t align)
+{
+	resource_size_t start = res->start;
+
+	if (res->flags & IORESOURCE_IO && start & 0x300)
+		start = (start + 0x3ff) & ~0x3ff;
+
+	start = (start + align - 1) & ~(align - 1);
+
+	return start;
+}
+
+/**
+ * pcibios_enable_device - Enable I/O and memory.
+ * @dev: PCI device to be enabled
+ */
+int pcibios_enable_device(struct pci_dev *dev, int mask)
+{
+	u16 cmd, old_cmd;
+	int idx;
+	struct resource *r;
+
+	pci_read_config_word(dev, PCI_COMMAND, &cmd);
+	old_cmd = cmd;
+	for (idx = 0; idx < 6; idx++) {
+		/* Only set up the requested stuff */
+		if (!(mask & (1 << idx)))
+			continue;
+
+		r = dev->resource + idx;
+		if (!r->start && r->end) {
+			printk(KERN_ERR "PCI: Device %s not available because"
+			       " of resource collisions\n", pci_name(dev));
+			return -EINVAL;
+		}
+		if (r->flags & IORESOURCE_IO)
+			cmd |= PCI_COMMAND_IO;
+		if (r->flags & IORESOURCE_MEM)
+			cmd |= PCI_COMMAND_MEMORY;
+	}
+
+	/*
+	 * Bridges (eg, cardbus bridges) need to be fully enabled
+	 */
+	if ((dev->class >> 16) == PCI_BASE_CLASS_BRIDGE)
+		cmd |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
+
+	if (cmd != old_cmd) {
+		printk("PCI: enabling device %s (%04x -> %04x)\n",
+		       pci_name(dev), old_cmd, cmd);
+		pci_write_config_word(dev, PCI_COMMAND, cmd);
+	}
+	return 0;
+}
+
+int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
+			enum pci_mmap_state mmap_state, int write_combine)
+{
+	unsigned long phys;
+
+	if (mmap_state == pci_mmap_io)
+		return -EINVAL;
+
+	phys = vma->vm_pgoff;
+
+	/*
+	 * Mark this as IO
+	 */
+	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+
+	if (remap_pfn_range(vma, vma->vm_start, phys,
+			     vma->vm_end - vma->vm_start,
+			     vma->vm_page_prot))
+		return -EAGAIN;
+
+	return 0;
+}