patch-2.4.4 linux/arch/mips/mips-boards/generic/pci.c

• Lines: 329
• Date: Fri Apr 13 20:26:07 2001
• Orig file: v2.4.3/linux/arch/mips/mips-boards/generic/pci.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.3/linux/arch/mips/mips-boards/generic/pci.c linux/arch/mips/mips-boards/generic/pci.c
@@ -0,0 +1,328 @@
+/*
+ * Carsten Langgaard, carstenl@mips.com
+ * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
+ *
+ *  This program is free software; you can distribute it and/or modify it
+ *  under the terms of the GNU General Public License (Version 2) as
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * MIPS boards specific PCI support.
+ *
+ */
+#include <linux/config.h>
+
+#ifdef CONFIG_PCI
+
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+
+#include <asm/mips-boards/generic.h>
+#include <asm/gt64120.h>
+#ifdef CONFIG_MIPS_MALTA
+#include <asm/mips-boards/malta.h>
+#endif
+
+#define PCI_ACCESS_READ  0
+#define PCI_ACCESS_WRITE 1
+
+static int
+mips_pcibios_config_access(unsigned char access_type, struct pci_dev *dev,
+                           unsigned char where, u32 *data)
+{
+	unsigned char bus = dev->bus->number;
+	unsigned char dev_fn = dev->devfn;
+        u32 intr;
+
+	if ((bus == 0) && (dev_fn >= PCI_DEVFN(31,0)))
+	        return -1; /* Because of a bug in the galileo (for slot 31). */
+
+	/* Clear cause register bits */
+	GT_WRITE(GT_INTRCAUSE_OFS, ~(GT_INTRCAUSE_MASABORT0_BIT | 
+	                             GT_INTRCAUSE_TARABORT0_BIT));
+
+	/* Setup address */
+	GT_WRITE(GT_PCI0_CFGADDR_OFS, 
+		 (bus         << GT_PCI0_CFGADDR_BUSNUM_SHF)   |
+		 (dev_fn      << GT_PCI0_CFGADDR_FUNCTNUM_SHF) |
+		 ((where / 4) << GT_PCI0_CFGADDR_REGNUM_SHF)   |
+		 GT_PCI0_CFGADDR_CONFIGEN_BIT);
+
+	if (access_type == PCI_ACCESS_WRITE) {
+	        if (bus == 0 && dev_fn == 0) {
+		        /* 
+			 * Galileo is acting differently than other devices. 
+			 */
+		        GT_WRITE(GT_PCI0_CFGDATA_OFS, *data);
+		} else {
+		        GT_PCI_WRITE(GT_PCI0_CFGDATA_OFS, *data);
+		}
+	} else {
+	        if (bus == 0 && dev_fn == 0) {
+		        /* 
+			 * Galileo is acting differently than other devices. 
+			 */
+		        GT_READ(GT_PCI0_CFGDATA_OFS, *data);
+		} else {
+		        GT_PCI_READ(GT_PCI0_CFGDATA_OFS, *data);
+		}
+	}
+
+	/* Check for master or target abort */
+	GT_READ(GT_INTRCAUSE_OFS, intr);
+
+	if (intr & (GT_INTRCAUSE_MASABORT0_BIT | GT_INTRCAUSE_TARABORT0_BIT))
+	{
+	        /* Error occured */
+
+	        /* Clear bits */
+	        GT_WRITE( GT_INTRCAUSE_OFS, ~(GT_INTRCAUSE_MASABORT0_BIT | 
+					      GT_INTRCAUSE_TARABORT0_BIT) );
+
+		return -1;
+	}
+
+	return 0;
+}
+
+
+/*
+ * We can't address 8 and 16 bit words directly.  Instead we have to
+ * read/write a 32bit word and mask/modify the data we actually want.
+ */
+static int
+mips_pcibios_read_config_byte (struct pci_dev *dev, int where, u8 *val)
+{
+	u32 data = 0;
+
+	if (mips_pcibios_config_access(PCI_ACCESS_READ, dev, where, &data))
+		return -1;
+
+	*val = (data >> ((where & 3) << 3)) & 0xff;
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+
+static int
+mips_pcibios_read_config_word (struct pci_dev *dev, int where, u16 *val)
+{
+	u32 data = 0;
+
+	if (where & 1)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	if (mips_pcibios_config_access(PCI_ACCESS_READ, dev, where, &data))
+	       return -1;
+
+	*val = (data >> ((where & 3) << 3)) & 0xffff;
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int
+mips_pcibios_read_config_dword (struct pci_dev *dev, int where, u32 *val)
+{
+	u32 data = 0;
+
+	if (where & 3)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+	
+	if (mips_pcibios_config_access(PCI_ACCESS_READ, dev, where, &data))
+		return -1;
+
+	*val = data;
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+
+static int
+mips_pcibios_write_config_byte (struct pci_dev *dev, int where, u8 val)
+{
+	u32 data = 0;
+       
+	if (mips_pcibios_config_access(PCI_ACCESS_READ, dev, where, &data))
+		return -1;
+
+	data = (data & ~(0xff << ((where & 3) << 3))) |
+	       (val << ((where & 3) << 3));
+
+	if (mips_pcibios_config_access(PCI_ACCESS_WRITE, dev, where, &data))
+		return -1;
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int
+mips_pcibios_write_config_word (struct pci_dev *dev, int where, u16 val)
+{
+        u32 data = 0;
+
+	if (where & 1)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+       
+        if (mips_pcibios_config_access(PCI_ACCESS_READ, dev, where, &data))
+	       return -1;
+
+	data = (data & ~(0xffff << ((where & 3) << 3))) | 
+	       (val << ((where & 3) << 3));
+
+	if (mips_pcibios_config_access(PCI_ACCESS_WRITE, dev, where, &data))
+	       return -1;
+
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int
+mips_pcibios_write_config_dword(struct pci_dev *dev, int where, u32 val)
+{
+	if (where & 3)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	if (mips_pcibios_config_access(PCI_ACCESS_WRITE, dev, where, &val))
+	       return -1;
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+struct pci_ops mips_pci_ops = {
+	mips_pcibios_read_config_byte,
+        mips_pcibios_read_config_word,
+	mips_pcibios_read_config_dword,
+	mips_pcibios_write_config_byte,
+	mips_pcibios_write_config_word,
+	mips_pcibios_write_config_dword
+};
+
+void __init pcibios_init(void)
+{
+#ifdef CONFIG_MIPS_MALTA
+	struct pci_dev *pdev;
+	unsigned char reg_val;
+#endif
+
+	printk("PCI: Probing PCI hardware on host bus 0.\n");
+	pci_scan_bus(0, &mips_pci_ops, NULL);
+
+	/* 
+	 * Due to a bug in the Galileo system controller, we need to setup 
+	 * the PCI BAR for the Galileo internal registers.
+	 * This should be done in the bios/bootprom and will be fixed in
+	 * a later revision of YAMON (the MIPS boards boot prom).
+	 */
+	GT_WRITE(GT_PCI0_CFGADDR_OFS,
+		 (0 << GT_PCI0_CFGADDR_BUSNUM_SHF)   |  /* Local bus */
+		 (0 << GT_PCI0_CFGADDR_DEVNUM_SHF)   |  /* GT64120 device */
+		 (0 << GT_PCI0_CFGADDR_FUNCTNUM_SHF) |  /* Function 0 */
+		 ((0x20/4) << GT_PCI0_CFGADDR_REGNUM_SHF) |  /* BAR 4 */
+		 GT_PCI0_CFGADDR_CONFIGEN_BIT );
+
+	/* Perform the write */
+	GT_WRITE( GT_PCI0_CFGDATA_OFS, PHYSADDR(MIPS_GT_BASE)); 
+
+#ifdef CONFIG_MIPS_MALTA
+	pci_for_each_dev(pdev) {
+		if ((pdev->vendor == PCI_VENDOR_ID_INTEL)
+		    && (pdev->device == PCI_DEVICE_ID_INTEL_82371AB)
+		    && (PCI_SLOT(pdev->devfn) == 0x0a)) {
+			/*
+			 * IDE Decode enable.
+			 */
+			pci_read_config_byte(pdev, 0x41, &reg_val);
+        		pci_write_config_byte(pdev, 0x41, reg_val | 0x80);
+			pci_read_config_byte(pdev, 0x43, &reg_val);
+        		pci_write_config_byte(pdev, 0x43, reg_val | 0x80);
+		}
+
+		if ((pdev->vendor == PCI_VENDOR_ID_INTEL)
+		    && (pdev->device == PCI_DEVICE_ID_INTEL_82371AB_0)
+		    && (PCI_SLOT(pdev->devfn) == 0x0a)) {
+			/*
+			 * Set top of main memory accessible by ISA or DMA
+			 * devices to 16 Mb.
+			 */
+			pci_read_config_byte(pdev, 0x69, &reg_val);
+			pci_write_config_byte(pdev, 0x69, reg_val | 0xf0);
+		}
+	}
+
+	/* 
+	 * Activate Floppy Controller in the SMSC FDC37M817 Super I/O 
+	 * Controller.
+	 * This should be done in the bios/bootprom and will be fixed in
+         * a later revision of YAMON (the MIPS boards boot prom).
+	 */
+	/* Entering config state. */
+	SMSC_WRITE(SMSC_CONFIG_ENTER, SMSC_CONFIG_REG); 
+       
+	/* Activate floppy controller. */
+	SMSC_WRITE(SMSC_CONFIG_DEVNUM, SMSC_CONFIG_REG);
+	SMSC_WRITE(SMSC_CONFIG_DEVNUM_FLOPPY, SMSC_DATA_REG);
+	SMSC_WRITE(SMSC_CONFIG_ACTIVATE, SMSC_CONFIG_REG);
+	SMSC_WRITE(SMSC_CONFIG_ACTIVATE_ENABLE, SMSC_DATA_REG);
+
+	/* Exit config state. */
+	SMSC_WRITE(SMSC_CONFIG_EXIT, SMSC_CONFIG_REG);
+#endif
+}
+
+int __init
+pcibios_enable_device(struct pci_dev *dev)
+{
+	/* Not needed, since we enable all devices at startup.  */
+	return 0;
+}
+
+void __init
+pcibios_align_resource(void *data, struct resource *res, unsigned long size)
+{
+}
+
+char * __init
+pcibios_setup(char *str)
+{
+	/* Nothing to do for now.  */
+
+	return str;
+}
+
+struct pci_fixup pcibios_fixups[] = {
+	{ 0 }
+};
+
+void __init
+pcibios_update_resource(struct pci_dev *dev, struct resource *root,
+                        struct resource *res, int resource)
+{
+	unsigned long where, size;
+	u32 reg;
+
+	where = PCI_BASE_ADDRESS_0 + (resource * 4);
+	size = res->end - res->start;
+	pci_read_config_dword(dev, where, &reg);
+	reg = (reg & size) | (((u32)(res->start - root->start)) & ~size);
+	pci_write_config_dword(dev, where, reg);
+}
+
+/*
+ *  Called after each bus is probed, but before its children
+ *  are examined.
+ */
+void __init pcibios_fixup_bus(struct pci_bus *b)
+{
+	pci_read_bridge_bases(b);
+}
+
+#endif /* CONFIG_PCI */