diff options
Diffstat (limited to 'arch/x86/cpu/sc520/sc520_pci.c')
| -rw-r--r-- | arch/x86/cpu/sc520/sc520_pci.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/arch/x86/cpu/sc520/sc520_pci.c b/arch/x86/cpu/sc520/sc520_pci.c new file mode 100644 index 000000000..8cd7ffecd --- /dev/null +++ b/arch/x86/cpu/sc520/sc520_pci.c @@ -0,0 +1,140 @@ +/* + * (C) Copyright 2008-2011 + * Graeme Russ, <graeme.russ@gmail.com> + * + * (C) Copyright 2002 + * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se> + * + * 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 + */ + +#include <common.h> +#include <pci.h> +#include <asm/io.h> +#include <asm/pci.h> +#include <asm/ic/pci.h> +#include <asm/ic/sc520.h> + +static struct { + u8 priority; + u16 level_reg; + u8 level_bit; +} sc520_irq[] = { + { SC520_IRQ0, 0, 0x01 }, + { SC520_IRQ1, 0, 0x02 }, + { SC520_IRQ2, 1, 0x02 }, + { SC520_IRQ3, 0, 0x08 }, + { SC520_IRQ4, 0, 0x10 }, + { SC520_IRQ5, 0, 0x20 }, + { SC520_IRQ6, 0, 0x40 }, + { SC520_IRQ7, 0, 0x80 }, + + { SC520_IRQ8, 1, 0x01 }, + { SC520_IRQ9, 1, 0x02 }, + { SC520_IRQ10, 1, 0x04 }, + { SC520_IRQ11, 1, 0x08 }, + { SC520_IRQ12, 1, 0x10 }, + { SC520_IRQ13, 1, 0x20 }, + { SC520_IRQ14, 1, 0x40 }, + { SC520_IRQ15, 1, 0x80 } +}; + +/* The interrupt used for PCI INTA-INTD */ +int sc520_pci_ints[15] = { + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1 +}; + +/* utility function to configure a pci interrupt */ +int pci_sc520_set_irq(int pci_pin, int irq) +{ + int i; + u8 tmpb; + u16 tmpw; + + debug("set_irq(): map INT%c to IRQ%d\n", pci_pin + 'A', irq); + + if (irq < 0 || irq > 15) { + return -1; /* illegal irq */ + } + + if (pci_pin < 0 || pci_pin > 15) { + return -1; /* illegal pci int pin */ + } + + /* first disable any non-pci interrupt source that use + * this level */ + + /* PCI interrupt mapping (A through D)*/ + for (i=0; i<=3 ;i++) { + if (readb(&sc520_mmcr->pci_int_map[i]) == sc520_irq[irq].priority) + writeb(SC520_IRQ_DISABLED, &sc520_mmcr->pci_int_map[i]); + } + + /* GP IRQ interrupt mapping */ + for (i=0; i<=10 ;i++) { + if (readb(&sc520_mmcr->gp_int_map[i]) == sc520_irq[irq].priority) + writeb(SC520_IRQ_DISABLED, &sc520_mmcr->gp_int_map[i]); + } + + /* Set the trigger to level */ + tmpb = readb(&sc520_mmcr->pic_mode[sc520_irq[irq].level_reg]); + tmpb |= sc520_irq[irq].level_bit; + writeb(tmpb, &sc520_mmcr->pic_mode[sc520_irq[irq].level_reg]); + + + if (pci_pin < 4) { + /* PCI INTA-INTD */ + /* route the interrupt */ + writeb(sc520_irq[irq].priority, &sc520_mmcr->pci_int_map[pci_pin]); + } else { + /* GPIRQ0-GPIRQ10 used for additional PCI INTS */ + writeb(sc520_irq[irq].priority, &sc520_mmcr->gp_int_map[pci_pin - 4]); + + /* also set the polarity in this case */ + tmpw = readw(&sc520_mmcr->intpinpol); + tmpw |= (1 << (pci_pin-4)); + writew(tmpw, &sc520_mmcr->intpinpol); + } + + /* register the pin */ + sc520_pci_ints[pci_pin] = irq; + + + return 0; /* OK */ +} + +void pci_sc520_init(struct pci_controller *hose) +{ + hose->first_busno = 0; + hose->last_busno = 0xff; + hose->region_count = pci_set_regions(hose); + + pci_setup_type1(hose, + SC520_REG_ADDR, + SC520_REG_DATA); + + pci_register_hose(hose); + + hose->last_busno = pci_hose_scan(hose); + + /* enable target memory acceses on host brige */ + pci_write_config_word(0, PCI_COMMAND, + PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER); +} |