Tsi108 on chip pci controller support.

If there is no pci card, the tsi108/109 pci configure read will
cause a machine check exception to the processor. PCI error should
also be cleared after the read.

Signed-off-by: Alexandre Bounine <alexandreb@tundra.com>
Signed-off-by: Roy Zang <tie-fei.zang@freescale.com>

drivers/tsi108_pci.c

+/*
+ * (C) Copyright 2004 Tundra Semiconductor Corp.
+ * Alex Bounine <alexandreb@tundra.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that 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
+ */
+
+/*
+ * PCI initialisation for the Tsi108 EMU board.
+ */
+
+#include <config.h>
+
+#ifdef CONFIG_TSI108_PCI
+
+#include <common.h>
+#include <pci.h>
+#include <asm/io.h>
+#include <tsi108.h>
+
+struct pci_controller local_hose;
+
+void tsi108_clear_pci_error(void)
+{
+	u32 err_stat, err_addr, pci_stat;
+
+	/*
+	 * Quietly clear errors signalled as result of PCI/X configuration read
+	 * requests.
+	 */
+	/* Read PB Error Log Registers */
+	err_stat = *(volatile u32 *)(CFG_TSI108_CSR_BASE +
+				     TSI108_PB_REG_OFFSET + PB_ERRCS);
+	err_addr = *(volatile u32 *)(CFG_TSI108_CSR_BASE +
+				     TSI108_PB_REG_OFFSET + PB_AERR);
+	if (err_stat & PB_ERRCS_ES) {
+		/* Clear PCI/X bus errors if applicable */
+		if ((err_addr & 0xFF000000) == CFG_PCI_CFG_BASE) {
+			/* Clear error flag */
+			*(u32 *) (CFG_TSI108_CSR_BASE +
+				  TSI108_PB_REG_OFFSET + PB_ERRCS) =
+			    PB_ERRCS_ES;
+
+			/* Clear read error reported in PB_ISR */
+			*(u32 *) (CFG_TSI108_CSR_BASE +
+				  TSI108_PB_REG_OFFSET + PB_ISR) =
+			    PB_ISR_PBS_RD_ERR;
+
+		/* Clear errors reported by PCI CSR (Normally Master Abort) */
+			pci_stat = *(volatile u32 *)(CFG_TSI108_CSR_BASE +
+						     TSI108_PCI_REG_OFFSET +
+						     PCI_CSR);
+			*(volatile u32 *)(CFG_TSI108_CSR_BASE +
+					  TSI108_PCI_REG_OFFSET + PCI_CSR) =
+			    pci_stat;
+
+			*(volatile u32 *)(CFG_TSI108_CSR_BASE +
+					  TSI108_PCI_REG_OFFSET +
+					  PCI_IRP_STAT) = PCI_IRP_STAT_P_CSR;
+		}
+	}
+
+	return;
+}
+
+unsigned int __get_pci_config_dword(u32 addr)
+{
+	unsigned int retval;
+
+	__asm__ __volatile__("       lwbrx %0,0,%1\n"
+			     "1:     eieio\n"
+			     "2:\n"
+			     ".section .fixup,\"ax\"\n"
+			     "3:     li %0,-1\n"
+			     "       b 2b\n"
+			     ".section __ex_table,\"a\"\n"
+			     "       .align 2\n"
+			     "       .long 1b,3b\n"
+			     ".text":"=r"(retval):"r"(addr));
+
+	return (retval);
+}
+
+static int tsi108_read_config_dword(struct pci_controller *hose,
+				    pci_dev_t dev, int offset, u32 * value)
+{
+	dev &= (CFG_PCI_CFG_SIZE - 1);
+	dev |= (CFG_PCI_CFG_BASE | (offset & 0xfc));
+	*value = __get_pci_config_dword(dev);
+	if (0xFFFFFFFF == *value)
+		tsi108_clear_pci_error();
+	return 0;
+}
+
+static int tsi108_write_config_dword(struct pci_controller *hose,
+				     pci_dev_t dev, int offset, u32 value)
+{
+	dev &= (CFG_PCI_CFG_SIZE - 1);
+	dev |= (CFG_PCI_CFG_BASE | (offset & 0xfc));
+
+	out_le32((volatile unsigned *)dev, value);
+
+	return 0;
+}
+
+void pci_init_board(void)
+{
+	struct pci_controller *hose = (struct pci_controller *)&local_hose;
+
+	hose->first_busno = 0;
+	hose->last_busno = 0xff;
+
+	pci_set_region(hose->regions + 0,
+		       CFG_PCI_MEMORY_BUS,
+		       CFG_PCI_MEMORY_PHYS,
+		       CFG_PCI_MEMORY_SIZE, PCI_REGION_MEM | PCI_REGION_MEMORY);
+
+	/* PCI memory space */
+	pci_set_region(hose->regions + 1,
+		       CFG_PCI_MEM_BUS,
+		       CFG_PCI_MEM_PHYS, CFG_PCI_MEM_SIZE, PCI_REGION_MEM);
+
+	/* PCI I/O space */
+	pci_set_region(hose->regions + 2,
+		       CFG_PCI_IO_BUS,
+		       CFG_PCI_IO_PHYS, CFG_PCI_IO_SIZE, PCI_REGION_IO);
+
+	hose->region_count = 3;
+
+	pci_set_ops(hose,
+		    pci_hose_read_config_byte_via_dword,
+		    pci_hose_read_config_word_via_dword,
+		    tsi108_read_config_dword,
+		    pci_hose_write_config_byte_via_dword,
+		    pci_hose_write_config_word_via_dword,
+		    tsi108_write_config_dword);
+
+	pci_register_hose(hose);
+
+	hose->last_busno = pci_hose_scan(hose);
+
+	debug("Done PCI initialization\n");
+	return;
+}
+
+#ifdef CONFIG_OF_FLAT_TREE
+void
+ft_pci_setup(void *blob, bd_t *bd)
+{
+	u32 *p;
+	int len;
+
+	p = (u32 *)ft_get_prop(blob, "/" OF_TSI "/pci@1000/bus-range", &len);
+	if (p != NULL) {
+		p[0] = local_hose.first_busno;
+		p[1] = local_hose.last_busno;
+	}
+
+}
+#endif
+
+#endif	/* CONFIG_TSI108_PCI */