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e2fee5723b
The built-in Loongson 2E/2F northbridge in is bonito64-compatible but not identical with it. To avoid influencing the original bonito64 support and make the loongson support more maintainable, it's better to separate the Bonito64 code from the Loongson code. This also prepares the kernel for the coming Loongson 2f machines family support. Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> Cc: Linux-MIPS <linux-mips@linux-mips.org> Cc: yanh@lemote.com Cc: huhb@lemote.com Cc: Zhang Le <r0bertz@gentoo.org> Cc: zhangfx@lemote.com, Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
162 lines
4.1 KiB
C
162 lines
4.1 KiB
C
/*
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* Copyright (C) 1999, 2000, 2004 MIPS Technologies, Inc.
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* All rights reserved.
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* Authors: Carsten Langgaard <carstenl@mips.com>
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* Maciej W. Rozycki <macro@mips.com>
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*
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* This program is free software; you can distribute it and/or modify it
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* under the terms of the GNU General Public License (Version 2) as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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* MIPS boards specific PCI support.
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*/
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#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <asm/mips-boards/bonito64.h>
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#define PCI_ACCESS_READ 0
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#define PCI_ACCESS_WRITE 1
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#define CFG_SPACE_REG(offset) (void *)CKSEG1ADDR(_pcictrl_bonito_pcicfg + (offset))
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#define ID_SEL_BEGIN 10
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#define MAX_DEV_NUM (31 - ID_SEL_BEGIN)
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static int bonito64_pcibios_config_access(unsigned char access_type,
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struct pci_bus *bus,
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unsigned int devfn, int where,
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u32 * data)
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{
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u32 busnum = bus->number;
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u32 addr, type;
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u32 dummy;
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void *addrp;
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int device = PCI_SLOT(devfn);
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int function = PCI_FUNC(devfn);
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int reg = where & ~3;
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if (busnum == 0) {
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/* Type 0 configuration for onboard PCI bus */
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if (device > MAX_DEV_NUM)
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return -1;
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addr = (1 << (device + ID_SEL_BEGIN)) | (function << 8) | reg;
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type = 0;
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} else {
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/* Type 1 configuration for offboard PCI bus */
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addr = (busnum << 16) | (device << 11) | (function << 8) | reg;
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type = 0x10000;
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}
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/* Clear aborts */
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BONITO_PCICMD |= BONITO_PCICMD_MABORT_CLR | BONITO_PCICMD_MTABORT_CLR;
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BONITO_PCIMAP_CFG = (addr >> 16) | type;
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/* Flush Bonito register block */
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dummy = BONITO_PCIMAP_CFG;
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mmiowb();
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addrp = CFG_SPACE_REG(addr & 0xffff);
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if (access_type == PCI_ACCESS_WRITE) {
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writel(cpu_to_le32(*data), addrp);
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/* Wait till done */
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while (BONITO_PCIMSTAT & 0xF);
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} else {
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*data = le32_to_cpu(readl(addrp));
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}
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/* Detect Master/Target abort */
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if (BONITO_PCICMD & (BONITO_PCICMD_MABORT_CLR |
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BONITO_PCICMD_MTABORT_CLR)) {
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/* Error occurred */
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/* Clear bits */
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BONITO_PCICMD |= (BONITO_PCICMD_MABORT_CLR |
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BONITO_PCICMD_MTABORT_CLR);
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return -1;
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}
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return 0;
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}
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/*
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* We can't address 8 and 16 bit words directly. Instead we have to
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* read/write a 32bit word and mask/modify the data we actually want.
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*/
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static int bonito64_pcibios_read(struct pci_bus *bus, unsigned int devfn,
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int where, int size, u32 * val)
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{
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u32 data = 0;
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if ((size == 2) && (where & 1))
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return PCIBIOS_BAD_REGISTER_NUMBER;
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else if ((size == 4) && (where & 3))
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return PCIBIOS_BAD_REGISTER_NUMBER;
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if (bonito64_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where,
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&data))
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return -1;
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if (size == 1)
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*val = (data >> ((where & 3) << 3)) & 0xff;
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else if (size == 2)
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*val = (data >> ((where & 3) << 3)) & 0xffff;
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else
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*val = data;
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return PCIBIOS_SUCCESSFUL;
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}
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static int bonito64_pcibios_write(struct pci_bus *bus, unsigned int devfn,
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int where, int size, u32 val)
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{
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u32 data = 0;
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if ((size == 2) && (where & 1))
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return PCIBIOS_BAD_REGISTER_NUMBER;
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else if ((size == 4) && (where & 3))
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return PCIBIOS_BAD_REGISTER_NUMBER;
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if (size == 4)
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data = val;
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else {
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if (bonito64_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
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where, &data))
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return -1;
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if (size == 1)
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data = (data & ~(0xff << ((where & 3) << 3))) |
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(val << ((where & 3) << 3));
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else if (size == 2)
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data = (data & ~(0xffff << ((where & 3) << 3))) |
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(val << ((where & 3) << 3));
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}
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if (bonito64_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where,
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&data))
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return -1;
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return PCIBIOS_SUCCESSFUL;
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}
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struct pci_ops bonito64_pci_ops = {
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.read = bonito64_pcibios_read,
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.write = bonito64_pcibios_write
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};
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