patch-2.3.16 linux/arch/arm/kernel/bios32.c

• Lines: 353
• Date: Mon Aug 30 18:14:55 1999
• Orig file: v2.3.15/linux/arch/arm/kernel/bios32.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.15/linux/arch/arm/kernel/bios32.c linux/arch/arm/kernel/bios32.c
@@ -0,0 +1,352 @@
+/*
+ * arch/arm/kernel/bios32.c
+ *
+ * PCI bios-type initialisation for PCI machines
+ *
+ * Bits taken from various places.
+ */
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+
+#include <asm/irq.h>
+#include <asm/system.h>
+
+int have_isa_bridge;
+
+int (*pci_irq_fixup)(struct pci_dev *dev);
+
+extern struct pci_ops *dc21285_init(int pass);
+extern void pcibios_fixup_ebsa285(struct pci_dev *dev);
+extern void hw_init(void);
+
+void
+pcibios_report_device_errors(void)
+{
+	struct pci_dev *dev;
+
+	for (dev = pci_devices; dev; dev = dev->next) {
+		u16 status;
+
+		pci_read_config_word(dev, PCI_STATUS, &status);
+
+		if (status & 0xf900) {
+			pci_write_config_word(dev, PCI_STATUS, status & 0xf900);
+			printk(KERN_DEBUG "PCI: %02x:%02x status = %X\n",
+				dev->bus->number, dev->devfn, status);
+		}
+	}
+}
+
+/*
+ * We don't use this to fix the device, but more our initialisation.
+ * It's not the correct use for this, but it works.  The actions we
+ * take are:
+ * - enable only IO
+ * - set memory region to start at zero
+ * - (0x48) enable all memory requests from ISA to be channeled to PCI
+ * - (0x42) disable ping-pong (as per errata)
+ * - (0x40) enable PCI packet retry
+ * - (0x83) don't use CPU park enable, park on last master, disable GAT bit
+ * - (0x80) default rotating priorities
+ * - (0x81) rotate bank 4
+ */
+static void __init pci_fixup_83c553(struct pci_dev *dev)
+{
+	pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, PCI_BASE_ADDRESS_SPACE_MEMORY);
+	pci_write_config_word(dev, PCI_COMMAND, PCI_COMMAND_IO);
+
+	dev->resource[0].end -= dev->resource[0].start;
+	dev->resource[0].start = 0;
+
+	pci_write_config_byte(dev, 0x48, 0xff);
+	pci_write_config_byte(dev, 0x42, 0x00);
+	pci_write_config_byte(dev, 0x40, 0x22);
+	pci_write_config_byte(dev, 0x83, 0x02);
+	pci_write_config_byte(dev, 0x80, 0xe0);
+	pci_write_config_byte(dev, 0x81, 0x01);
+}
+
+struct pci_fixup pcibios_fixups[] = {
+	{ PCI_FIXUP_HEADER, PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_83C553, pci_fixup_83c553 },
+	{ 0 }
+};
+
+/*
+ * Assign an address to an I/O range.
+ */
+static void __init pcibios_fixup_io_addr(struct pci_dev *dev, struct resource *r, int idx)
+{
+	unsigned int reg = PCI_BASE_ADDRESS_0 + (idx << 2);
+	unsigned int size = r->end - r->start + 1;
+	u32 try;
+
+	/*
+	 * We need to avoid collisions with `mirrored' VGA ports and other strange
+	 * ISA hardware, so we always want the addresses kilobyte aligned.
+	 */
+	if (!size || size > 256) {
+		printk(KERN_ERR "PCI: Cannot assign I/O space to %s, "
+		       "%d bytes are too much.\n", dev->name, size);
+		return;
+	}
+
+	if (allocate_resource(&ioport_resource, r, size, 0x9000, ~0, 1024)) {
+		printk(KERN_ERR "PCI: Unable to find free %d bytes of I/O "
+			"space for %s.\n", size, dev->name);
+		return;
+	}
+
+	printk("PCI: Assigning I/O space %04lx-%04lx to %s\n",
+		r->start, r->end, dev->name);
+
+	pci_write_config_dword(dev, reg, r->start | PCI_BASE_ADDRESS_SPACE_IO);
+	pci_read_config_dword(dev, reg, &try);
+
+	if ((try & PCI_BASE_ADDRESS_IO_MASK) != r->start) {
+		r->start = 0;
+		pci_write_config_dword(dev, reg, 0);
+		printk(KERN_ERR "PCI: I/O address setup failed, got %04x\n", try);
+	}
+}
+
+/*
+ * Assign an address to an memory range.
+ */
+static void __init pcibios_fixup_mem_addr(struct pci_dev *dev, struct resource *r, int idx)
+{
+	unsigned int reg = PCI_BASE_ADDRESS_0 + (idx << 2);
+	unsigned int size = r->end - r->start + 1;
+	u32 try;
+
+	if (!size) {
+		printk(KERN_ERR "PCI: Cannot assign memory space to %s, "
+		       "%d bytes are too much.\n", dev->name, size);
+		return;
+	}
+
+	if (allocate_resource(&iomem_resource, r, size,
+			      0x00100000, 0x0fffffff, 1024)) {
+		printk(KERN_ERR "PCI: Unable to find free %d bytes of memory "
+			"space for %s.\n", size, dev->name);
+		return;
+	}
+
+	printk("PCI: Assigning memory space %08lx-%08lx to %s\n",
+		r->start, r->end, dev->name);
+
+	pci_write_config_dword(dev, reg, r->start);
+	pci_read_config_dword(dev, reg, &try);
+
+	if (try != r->start) {
+		r->start = 0;
+		pci_write_config_dword(dev, reg, 0);
+		printk(KERN_ERR "PCI: memory address setup failed, "
+		       "got %08x\n", try);
+	}
+}
+
+#define _PCI_REGION_IO	1
+#define _PCI_REGION_MEM	2
+
+/*
+ * Fix up one PCI devices regions, enables and interrupt lines
+ */
+static void __init pcibios_fixup_device(struct pci_dev *dev, u16 *cmd)
+{
+	int i, has_regions = 0;
+
+	/*
+	 * Fix up the regions.  Any regions which aren't allocated
+	 * are given a free region.
+	 */
+	for (i = 0; i < 6; i++) {
+		struct resource *r = dev->resource + i;
+
+		if (r->flags & IORESOURCE_IO) {
+			has_regions |= _PCI_REGION_IO;
+
+			if (!r->start || r->end == 0xffffffff)
+				pcibios_fixup_io_addr(dev, r, i);
+		} else if (r->end) {
+			has_regions |= _PCI_REGION_MEM;
+
+			if (!r->start)
+				pcibios_fixup_mem_addr(dev, r, i);
+		}
+	}
+
+	switch (dev->class >> 8) {
+	case PCI_CLASS_BRIDGE_ISA:
+	case PCI_CLASS_BRIDGE_EISA:
+		/*
+		 * If this device is an ISA bridge, set the have_isa_bridge
+		 * flag.  We will then go looking for things like keyboard,
+		 * etc
+		 */
+		have_isa_bridge = !0;
+		/* FALL THROUGH */
+
+	default:
+		/*
+		 * Don't enable VGA-compatible cards since they have
+		 * fixed I/O and memory space.
+		 *
+		 * Don't enabled disabled IDE interfaces either because
+		 * some BIOSes may reallocate the same address when they
+		 * find that no devices are attached. 
+		 */
+		if (has_regions & _PCI_REGION_IO &&
+		    !((*cmd) & PCI_COMMAND_IO)) {
+			printk("PCI: Enabling I/O for %s\n", dev->name);
+			*cmd |= PCI_COMMAND_IO;
+		}
+
+		if (has_regions & _PCI_REGION_MEM &&
+		    !((*cmd) & PCI_COMMAND_MEMORY)) {
+			printk("PCI: Enabling memory for %s\n", dev->name);
+			*cmd |= PCI_COMMAND_MEMORY;
+		}
+	}
+}
+
+/*
+ * Fix base addresses, I/O and memory enables and IRQ's
+ */
+static void __init pcibios_fixup_devices(void)
+{
+	struct pci_dev *dev;
+
+	for (dev = pci_devices; dev; dev = dev->next) {
+		u16 cmd;
+
+		/*
+		 * architecture specific hacks.
+		 * I don't really want this here,
+		 * but I don't see any other place
+		 * for it to live.
+		 */
+		if (machine_is_netwinder() &&
+		    dev->vendor == PCI_VENDOR_ID_DEC &&
+		    dev->device == PCI_DEVICE_ID_DEC_21142)
+			/* Put the chip to sleep in case the driver isn't loaded */
+			pci_write_config_dword(dev, 0x40, 0x80000000);
+
+		/*
+		 * Set latency timer to 32, and a cache line size to 32 bytes.
+		 * Also, set system error enable, parity error enable, and
+		 * fast back to back transaction enable.  Disable ROM.
+		 */
+		pci_write_config_byte(dev, PCI_LATENCY_TIMER, 32);
+		pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 8);
+		pci_write_config_dword(dev, PCI_ROM_ADDRESS, 0);
+		pci_read_config_word(dev, PCI_COMMAND, &cmd);
+
+		cmd |= PCI_COMMAND_FAST_BACK | PCI_COMMAND_SERR |
+		       PCI_COMMAND_PARITY;
+
+		pcibios_fixup_device(dev, &cmd);
+
+		pci_write_config_word(dev, PCI_COMMAND, cmd);
+		pci_read_config_word(dev, PCI_COMMAND, &cmd);
+
+		/*
+		 * now fixup the IRQs, if required
+		 */
+		if (pci_irq_fixup)
+			dev->irq = pci_irq_fixup(dev);
+
+		/*
+		 * If any remaining IRQs are weird, fix it now.
+		 */
+		if (dev->irq >= NR_IRQS)
+			dev->irq = 0;
+
+		/*
+		 * catch any drivers still reading this from the
+		 * device itself.  This can be removed once
+		 * all drivers are fixed. (are there any?)
+		 */
+		pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
+	}
+}
+
+/*
+ * Allocate resources for all PCI devices that have been enabled.
+ * We need to do that before we try to fix up anything.
+ */
+static void __init pcibios_claim_resources(void)
+{
+	struct pci_dev *dev;
+	int idx;
+
+	for (dev = pci_devices; dev; dev = dev->next)
+		for (idx = 0; idx < PCI_NUM_RESOURCES; idx++) {
+			struct resource *a, *r = &dev->resource[idx];
+
+			/*
+			 * Ignore regions that start at 0 or
+			 * end at 0xffffffff
+			 */
+			if (!r->start || r->end == 0xffffffff)
+				continue;
+
+			if (r->flags & IORESOURCE_IO)
+				a = &ioport_resource;
+			else
+				a = &iomem_resource;
+
+			if (request_resource(a, r) < 0)
+				printk(KERN_ERR "PCI: Address space collision "
+					"on region %d of %s\n",
+					idx, dev->name);
+				/* We probably should disable the region,
+				 * shouldn't we?
+				 */
+		}
+}
+
+/*
+ * Called after each bus is probed, but before its children
+ * are examined.
+ *
+ * No fixup of bus required
+ */
+void __init pcibios_fixup_bus(struct pci_bus *bus)
+{
+}
+
+void __init pcibios_init(void)
+{
+	struct pci_ops *ops;
+
+	/*
+	 * Pre-initialisation.  Set up the host bridge.
+	 */
+	ops = dc21285_init(0);
+
+	printk("PCI: Probing PCI hardware\n");
+
+	pci_scan_bus(0, ops, NULL);
+	pcibios_claim_resources();
+	pcibios_fixup_devices();
+
+	/*
+	 * Now clear down any PCI error IRQs and
+	 * register the error handler
+	 */
+	dc21285_init(1);
+
+	/*
+	 * Initialise any other hardware after we've
+	 * got the PCI bus initialised.  We may need
+	 * the PCI bus to talk to this other hardware.
+	 */
+	hw_init();
+}
+
+char * __init pcibios_setup(char *str)
+{
+	return str;
+}