/* * Copyright (C) 2001,2002,2005 Broadcom Corporation * Copyright (C) 2004 by Ralf Baechle (ralf@linux-mips.org) * * 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. */ /* * BCM1x80/1x55-specific PCI support * * This module provides the glue between Linux's PCI subsystem * and the hardware. We basically provide glue for accessing * configuration space, and set up the translation for I/O * space accesses. * * To access configuration space, we use ioremap. In the 32-bit * kernel, this consumes either 4 or 8 page table pages, and 16MB of * kernel mapped memory. Hopefully neither of these should be a huge * problem. * * XXX: AT THIS TIME, ONLY the NATIVE PCI-X INTERFACE IS SUPPORTED. */ #include #include #include #include #include #include #include #include #include #include #include #include /* * Macros for calculating offsets into config space given a device * structure or dev/fun/reg */ #define CFGOFFSET(bus,devfn,where) (((bus)<<16)+((devfn)<<8)+(where)) #define CFGADDR(bus,devfn,where) CFGOFFSET((bus)->number,(devfn),where) static void *cfg_space; #define PCI_BUS_ENABLED 1 #define LDT_BUS_ENABLED 2 #define PCI_DEVICE_MODE 4 static int bcm1480_bus_status = 0; #define PCI_BRIDGE_DEVICE 0 #define LDT_BRIDGE_DEVICE 1 /* * Read/write 32-bit values in config space. */ static inline u32 READCFG32(u32 addr) { return *(u32 *)(cfg_space + (addr&~3)); } static inline void WRITECFG32(u32 addr, u32 data) { *(u32 *)(cfg_space + (addr & ~3)) = data; } int pcibios_map_irq(struct pci_dev *dev, u8 slot, u8 pin) { return dev->irq; } /* Do platform specific device initialization at pci_enable_device() time */ int pcibios_plat_dev_init(struct pci_dev *dev) { return 0; } /* * Some checks before doing config cycles: * In PCI Device Mode, hide everything on bus 0 except the LDT host * bridge. Otherwise, access is controlled by bridge MasterEn bits. */ static int bcm1480_pci_can_access(struct pci_bus *bus, int devfn) { if (!(bcm1480_bus_status & (PCI_BUS_ENABLED | PCI_DEVICE_MODE))) return 0; if (bus->number == 0) { if (bcm1480_bus_status & PCI_DEVICE_MODE) return 0; else return 1; } else return 1; } /* * Read/write access functions for various sizes of values * in config space. Return all 1's for disallowed accesses * for a kludgy but adequate simulation of master aborts. */ static int bcm1480_pcibios_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 * val) { u32 data = 0; if ((size == 2) && (where & 1)) return PCIBIOS_BAD_REGISTER_NUMBER; else if ((size == 4) && (where & 3)) return PCIBIOS_BAD_REGISTER_NUMBER; if (bcm1480_pci_can_access(bus, devfn)) data = READCFG32(CFGADDR(bus, devfn, where)); else data = 0xFFFFFFFF; if (size == 1) *val = (data >> ((where & 3) << 3)) & 0xff; else if (size == 2) *val = (data >> ((where & 3) << 3)) & 0xffff; else *val = data; return PCIBIOS_SUCCESSFUL; } static int bcm1480_pcibios_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val) { u32 cfgaddr = CFGADDR(bus, devfn, where); u32 data = 0; if ((size == 2) && (where & 1)) return PCIBIOS_BAD_REGISTER_NUMBER; else if ((size == 4) && (where & 3)) return PCIBIOS_BAD_REGISTER_NUMBER; if (!bcm1480_pci_can_access(bus, devfn)) return PCIBIOS_BAD_REGISTER_NUMBER; data = READCFG32(cfgaddr); if (size == 1) data = (data & ~(0xff << ((where & 3) << 3))) | (val << ((where & 3) << 3)); else if (size == 2) data = (data & ~(0xffff << ((where & 3) << 3))) | (val << ((where & 3) << 3)); else data = val; WRITECFG32(cfgaddr, data); return PCIBIOS_SUCCESSFUL; } struct pci_ops bcm1480_pci_ops = { bcm1480_pcibios_read, bcm1480_pcibios_write, }; static struct resource bcm1480_mem_resource = { .name = "BCM1480 PCI MEM", .start = 0x40000000UL, .end = 0x5fffffffUL, .flags = IORESOURCE_MEM, }; static struct resource bcm1480_io_resource = { .name = "BCM1480 PCI I/O", .start = 0x00000000UL, .end = 0x01ffffffUL, .flags = IORESOURCE_IO, }; struct pci_controller bcm1480_controller = { .pci_ops = &bcm1480_pci_ops, .mem_resource = &bcm1480_mem_resource, .io_resource = &bcm1480_io_resource, }; static int __init bcm1480_pcibios_init(void) { uint32_t cmdreg; uint64_t reg; extern int pci_probe_only; /* CFE will assign PCI resources */ pci_probe_only = 1; /* Avoid ISA compat ranges. */ PCIBIOS_MIN_IO = 0x00008000UL; PCIBIOS_MIN_MEM = 0x01000000UL; /* Set I/O resource limits. */ ioport_resource.end = 0x01ffffffUL; /* 32MB accessible by bcm1480 */ iomem_resource.end = 0xffffffffUL; /* no HT support yet */ cfg_space = ioremap(A_BCM1480_PHYS_PCI_CFG_MATCH_BITS, 16*1024*1024); /* * See if the PCI bus has been configured by the firmware. */ reg = *((volatile uint64_t *) IOADDR(A_SCD_SYSTEM_CFG)); if (!(reg & M_BCM1480_SYS_PCI_HOST)) { bcm1480_bus_status |= PCI_DEVICE_MODE; } else { cmdreg = READCFG32(CFGOFFSET(0, PCI_DEVFN(PCI_BRIDGE_DEVICE, 0), PCI_COMMAND)); if (!(cmdreg & PCI_COMMAND_MASTER)) { printk ("PCI: Skipping PCI probe. Bus is not initialized.\n"); iounmap(cfg_space); return 1; /* XXX */ } bcm1480_bus_status |= PCI_BUS_ENABLED; } /* * Establish mappings in KSEG2 (kernel virtual) to PCI I/O * space. Use "match bytes" policy to make everything look * little-endian. So, you need to also set * CONFIG_SWAP_IO_SPACE, but this is the combination that * works correctly with most of Linux's drivers. * XXX ehs: Should this happen in PCI Device mode? */ set_io_port_base((unsigned long) ioremap(A_BCM1480_PHYS_PCI_IO_MATCH_BYTES, 65536)); isa_slot_offset = (unsigned long) ioremap(A_BCM1480_PHYS_PCI_MEM_MATCH_BYTES, 1024*1024); register_pci_controller(&bcm1480_controller); #ifdef CONFIG_VGA_CONSOLE take_over_console(&vga_con,0,MAX_NR_CONSOLES-1,1); #endif return 0; } arch_initcall(bcm1480_pcibios_init);