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Diffstat (limited to 'arch/mips/gt64120/common/pci.c')
| -rw-r--r-- | arch/mips/gt64120/common/pci.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/arch/mips/gt64120/common/pci.c b/arch/mips/gt64120/common/pci.c new file mode 100644 index 00000000000..e9e5419a0d5 --- /dev/null +++ b/arch/mips/gt64120/common/pci.c @@ -0,0 +1,147 @@ +/* + * BRIEF MODULE DESCRIPTION + * Galileo Evaluation Boards PCI support. + * + * The general-purpose functions to read/write and configure the GT64120A's + * PCI registers (function names start with pci0 or pci1) are either direct + * copies of functions written by Galileo Technology, or are modifications + * of their functions to work with Linux 2.4 vs Linux 2.2. These functions + * are Copyright - Galileo Technology. + * + * Other functions are derived from other MIPS PCI implementations, or were + * written by RidgeRun, Inc, Copyright (C) 2000 RidgeRun, Inc. + * glonnon@ridgerun.com, skranz@ridgerun.com, stevej@ridgerun.com + * + * 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN + * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * 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., + * 675 Mass Ave, Cambridge, MA 02139, USA. + */ +#include <linux/init.h> +#include <linux/types.h> +#include <linux/pci.h> +#include <linux/kernel.h> +#include <asm/gt64120.h> + +#define SELF 0 + +/* + * pciXReadConfigReg - Read from a PCI configuration register + * - Make sure the GT is configured as a master before + * reading from another device on the PCI. + * - The function takes care of Big/Little endian conversion. + * INPUTS: regOffset: The register offset as it apears in the GT spec (or PCI + * spec) + * pciDevNum: The device number needs to be addressed. + * RETURNS: data , if the data == 0xffffffff check the master abort bit in the + * cause register to make sure the data is valid + * + * Configuration Address 0xCF8: + * + * 31 30 24 23 16 15 11 10 8 7 2 0 <=bit Number + * |congif|Reserved| Bus |Device|Function|Register|00| + * |Enable| |Number|Number| Number | Number | | <=field Name + * + */ +static unsigned int pci0ReadConfigReg(int offset, struct pci_dev *device) +{ + unsigned int DataForRegCf8; + unsigned int data; + + DataForRegCf8 = ((PCI_SLOT(device->devfn) << 11) | + (PCI_FUNC(device->devfn) << 8) | + (offset & ~0x3)) | 0x80000000; + GT_WRITE(GT_PCI0_CFGADDR_OFS, DataForRegCf8); + + /* + * The casual observer might wonder why the READ is duplicated here, + * rather than immediately following the WRITE, and just have the swap + * in the "if". That's because there is a latency problem with trying + * to read immediately after setting up the address register. The "if" + * check gives enough time for the address to stabilize, so the READ + * can work. + */ + if (PCI_SLOT(device->devfn) == SELF) /* This board */ + return GT_READ(GT_PCI0_CFGDATA_OFS); + else /* PCI is little endian so swap the Data. */ + return __GT_READ(GT_PCI0_CFGDATA_OFS); +} + +/* + * pciXWriteConfigReg - Write to a PCI configuration register + * - Make sure the GT is configured as a master before + * writingto another device on the PCI. + * - The function takes care of Big/Little endian conversion. + * Inputs: unsigned int regOffset: The register offset as it apears in the + * GT spec + * (or any other PCI device spec) + * pciDevNum: The device number needs to be addressed. + * + * Configuration Address 0xCF8: + * + * 31 30 24 23 16 15 11 10 8 7 2 0 <=bit Number + * |congif|Reserved| Bus |Device|Function|Register|00| + * |Enable| |Number|Number| Number | Number | | <=field Name + * + */ +static void pci0WriteConfigReg(unsigned int offset, + struct pci_dev *device, unsigned int data) +{ + unsigned int DataForRegCf8; + + DataForRegCf8 = ((PCI_SLOT(device->devfn) << 11) | + (PCI_FUNC(device->devfn) << 8) | + (offset & ~0x3)) | 0x80000000; + GT_WRITE(GT_PCI0_CFGADDR_OFS, DataForRegCf8); + + if (PCI_SLOT(device->devfn) == SELF) /* This board */ + GT_WRITE(GT_PCI0_CFGDATA_OFS, data); + else /* configuration Transaction over the pci. */ + __GT_WRITE(GT_PCI0_CFGDATA_OFS, data); +} + +extern struct pci_ops gt64120_pci_ops; + +void __init pcibios_init(void) +{ + u32 tmp; + struct pci_dev controller; + + controller.devfn = SELF; + + tmp = GT_READ(GT_PCI0_CMD_OFS); /* Huh??? -- Ralf */ + tmp = GT_READ(GT_PCI0_BARE_OFS); + + /* + * You have to enable bus mastering to configure any other + * card on the bus. + */ + tmp = pci0ReadConfigReg(PCI_COMMAND, &controller); + tmp |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_SERR; + pci0WriteConfigReg(PCI_COMMAND, &controller, tmp); + + /* + * Reset PCI I/O and PCI MEM values to ones supported by EVM. + */ + ioport_resource.start = GT_PCI_IO_BASE; + ioport_resource.end = GT_PCI_IO_BASE + GT_PCI_IO_SIZE - 1; + iomem_resource.start = GT_PCI_MEM_BASE; + iomem_resource.end = GT_PCI_MEM_BASE + GT_PCI_MEM_SIZE - 1; + + pci_scan_bus(0, >64120_pci_ops, NULL); +} |