Initial import

1 files changed, 299 insertions, 0 deletions

diff --git a/arch/parisc/kernel/pci.c b/arch/parisc/kernel/pci.c
new file mode 100644
index 000000000..64f2764a8
--- /dev/null
+++ b/arch/parisc/kernel/pci.c
@@ -0,0 +1,299 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1997, 1998 Ralf Baechle
+ * Copyright (C) 1999 SuSE GmbH
+ * Copyright (C) 1999-2001 Hewlett-Packard Company
+ * Copyright (C) 1999-2001 Grant Grundler
+ */
+#include <linux/eisa.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/types.h>
+
+#include <asm/io.h>
+#include <asm/superio.h>
+
+#define DEBUG_RESOURCES 0
+#define DEBUG_CONFIG 0
+
+#if DEBUG_CONFIG
+# define DBGC(x...)	printk(KERN_DEBUG x)
+#else
+# define DBGC(x...)
+#endif
+
+
+#if DEBUG_RESOURCES
+#define DBG_RES(x...)	printk(KERN_DEBUG x)
+#else
+#define DBG_RES(x...)
+#endif
+
+/* To be used as: mdelay(pci_post_reset_delay);
+ *
+ * post_reset is the time the kernel should stall to prevent anyone from
+ * accessing the PCI bus once #RESET is de-asserted. 
+ * PCI spec somewhere says 1 second but with multi-PCI bus systems,
+ * this makes the boot time much longer than necessary.
+ * 20ms seems to work for all the HP PCI implementations to date.
+ *
+ * #define pci_post_reset_delay 50
+ */
+
+struct pci_port_ops *pci_port __read_mostly;
+struct pci_bios_ops *pci_bios __read_mostly;
+
+static int pci_hba_count __read_mostly;
+
+/* parisc_pci_hba used by pci_port->in/out() ops to lookup bus data.  */
+#define PCI_HBA_MAX 32
+static struct pci_hba_data *parisc_pci_hba[PCI_HBA_MAX] __read_mostly;
+
+
+/********************************************************************
+**
+** I/O port space support
+**
+*********************************************************************/
+
+/* EISA port numbers and PCI port numbers share the same interface.  Some
+ * machines have both EISA and PCI adapters installed.  Rather than turn
+ * pci_port into an array, we reserve bus 0 for EISA and call the EISA
+ * routines if the access is to a port on bus 0.  We don't want to fix
+ * EISA and ISA drivers which assume port space is <= 0xffff.
+ */
+
+#ifdef CONFIG_EISA
+#define EISA_IN(size) if (EISA_bus && (b == 0)) return eisa_in##size(addr)
+#define EISA_OUT(size) if (EISA_bus && (b == 0)) return eisa_out##size(d, addr)
+#else
+#define EISA_IN(size)
+#define EISA_OUT(size)
+#endif
+
+#define PCI_PORT_IN(type, size) \
+u##size in##type (int addr) \
+{ \
+	int b = PCI_PORT_HBA(addr); \
+	EISA_IN(size); \
+	if (!parisc_pci_hba[b]) return (u##size) -1; \
+	return pci_port->in##type(parisc_pci_hba[b], PCI_PORT_ADDR(addr)); \
+} \
+EXPORT_SYMBOL(in##type);
+
+PCI_PORT_IN(b,  8)
+PCI_PORT_IN(w, 16)
+PCI_PORT_IN(l, 32)
+
+
+#define PCI_PORT_OUT(type, size) \
+void out##type (u##size d, int addr) \
+{ \
+	int b = PCI_PORT_HBA(addr); \
+	EISA_OUT(size); \
+	if (!parisc_pci_hba[b]) return; \
+	pci_port->out##type(parisc_pci_hba[b], PCI_PORT_ADDR(addr), d); \
+} \
+EXPORT_SYMBOL(out##type);
+
+PCI_PORT_OUT(b,  8)
+PCI_PORT_OUT(w, 16)
+PCI_PORT_OUT(l, 32)
+
+
+
+/*
+ * BIOS32 replacement.
+ */
+static int __init pcibios_init(void)
+{
+	if (!pci_bios)
+		return -1;
+
+	if (pci_bios->init) {
+		pci_bios->init();
+	} else {
+		printk(KERN_WARNING "pci_bios != NULL but init() is!\n");
+	}
+
+	/* Set the CLS for PCI as early as possible. */
+	pci_cache_line_size = pci_dfl_cache_line_size;
+
+	return 0;
+}
+
+
+/* Called from pci_do_scan_bus() *after* walking a bus but before walking PPBs. */
+void pcibios_fixup_bus(struct pci_bus *bus)
+{
+	if (pci_bios->fixup_bus) {
+		pci_bios->fixup_bus(bus);
+	} else {
+		printk(KERN_WARNING "pci_bios != NULL but fixup_bus() is!\n");
+	}
+}
+
+
+/*
+ * Called by pci_set_master() - a driver interface.
+ *
+ * Legacy PDC guarantees to set:
+ *	Map Memory BAR's into PA IO space.
+ *	Map Expansion ROM BAR into one common PA IO space per bus.
+ *	Map IO BAR's into PCI IO space.
+ *	Command (see below)
+ *	Cache Line Size
+ *	Latency Timer
+ *	Interrupt Line
+ *	PPB: secondary latency timer, io/mmio base/limit,
+ *		bus numbers, bridge control
+ *
+ */
+void pcibios_set_master(struct pci_dev *dev)
+{
+	u8 lat;
+
+	/* If someone already mucked with this, don't touch it. */
+	pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
+	if (lat >= 16) return;
+
+	/*
+	** HP generally has fewer devices on the bus than other architectures.
+	** upper byte is PCI_LATENCY_TIMER.
+	*/
+	pci_write_config_word(dev, PCI_CACHE_LINE_SIZE,
+			      (0x80 << 8) | pci_cache_line_size);
+}
+
+
+void __init pcibios_init_bus(struct pci_bus *bus)
+{
+	struct pci_dev *dev = bus->self;
+	unsigned short bridge_ctl;
+
+	/* We deal only with pci controllers and pci-pci bridges. */
+	if (!dev || (dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
+		return;
+
+	/* PCI-PCI bridge - set the cache line and default latency
+	   (32) for primary and secondary buses. */
+	pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, 32);
+
+	pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bridge_ctl);
+	bridge_ctl |= PCI_BRIDGE_CTL_PARITY | PCI_BRIDGE_CTL_SERR;
+	pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bridge_ctl);
+}
+
+/*
+ * pcibios align resources() is called every time generic PCI code
+ * wants to generate a new address. The process of looking for
+ * an available address, each candidate is first "aligned" and
+ * then checked if the resource is available until a match is found.
+ *
+ * Since we are just checking candidates, don't use any fields other
+ * than res->start.
+ */
+resource_size_t pcibios_align_resource(void *data, const struct resource *res,
+				resource_size_t size, resource_size_t alignment)
+{
+	resource_size_t mask, align, start = res->start;
+
+	DBG_RES("pcibios_align_resource(%s, (%p) [%lx,%lx]/%x, 0x%lx, 0x%lx)\n",
+		pci_name(((struct pci_dev *) data)),
+		res->parent, res->start, res->end,
+		(int) res->flags, size, alignment);
+
+	/* If it's not IO, then it's gotta be MEM */
+	align = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
+
+	/* Align to largest of MIN or input size */
+	mask = max(alignment, align) - 1;
+	start += mask;
+	start &= ~mask;
+
+	return start;
+}
+
+
+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 prot;
+
+	/*
+	 * I/O space can be accessed via normal processor loads and stores on
+	 * this platform but for now we elect not to do this and portable
+	 * drivers should not do this anyway.
+	 */
+	if (mmap_state == pci_mmap_io)
+		return -EINVAL;
+
+	if (write_combine)
+		return -EINVAL;
+
+	/*
+	 * Ignore write-combine; for now only return uncached mappings.
+	 */
+	prot = pgprot_val(vma->vm_page_prot);
+	prot |= _PAGE_NO_CACHE;
+	vma->vm_page_prot = __pgprot(prot);
+
+	return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
+		vma->vm_end - vma->vm_start, vma->vm_page_prot);
+}
+
+/*
+ * A driver is enabling the device.  We make sure that all the appropriate
+ * bits are set to allow the device to operate as the driver is expecting.
+ * We enable the port IO and memory IO bits if the device has any BARs of
+ * that type, and we enable the PERR and SERR bits unconditionally.
+ * Drivers that do not need parity (eg graphics and possibly networking)
+ * can clear these bits if they want.
+ */
+int pcibios_enable_device(struct pci_dev *dev, int mask)
+{
+	int err;
+	u16 cmd, old_cmd;
+
+	err = pci_enable_resources(dev, mask);
+	if (err < 0)
+		return err;
+
+	pci_read_config_word(dev, PCI_COMMAND, &cmd);
+	old_cmd = cmd;
+
+	cmd |= (PCI_COMMAND_SERR | PCI_COMMAND_PARITY);
+
+#if 0
+	/* If bridge/bus controller has FBB enabled, child must too. */
+	if (dev->bus->bridge_ctl & PCI_BRIDGE_CTL_FAST_BACK)
+		cmd |= PCI_COMMAND_FAST_BACK;
+#endif
+
+	if (cmd != old_cmd) {
+		dev_info(&dev->dev, "enabling SERR and PARITY (%04x -> %04x)\n",
+			old_cmd, cmd);
+		pci_write_config_word(dev, PCI_COMMAND, cmd);
+	}
+	return 0;
+}
+
+
+/* PA-RISC specific */
+void pcibios_register_hba(struct pci_hba_data *hba)
+{
+	if (pci_hba_count >= PCI_HBA_MAX) {
+		printk(KERN_ERR "PCI: Too many Host Bus Adapters\n");
+		return;
+	}
+
+	parisc_pci_hba[pci_hba_count] = hba;
+	hba->hba_num = pci_hba_count++;
+}
+
+subsys_initcall(pcibios_init);