pci.c
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上传日期:2013-04-10
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- /*
- * Copyright 2002 Momentum Computer
- * Author: Matthew Dharm <mdharm@momenco.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/config.h>
- #include <linux/types.h>
- #include <linux/pci.h>
- #include <linux/kernel.h>
- #include <linux/slab.h>
- #include <linux/version.h>
- #include <asm/pci.h>
- #include <asm/io.h>
- #include "gt64240.h"
- #include <linux/init.h>
- #ifdef CONFIG_PCI
- #define SELF 0
- #define MASTER_ABORT_BIT 0x100
- /*
- * These functions and structures provide the BIOS scan and mapping of the PCI
- * devices.
- */
- #define MAX_PCI_DEVS 10
- void gt64240_board_pcibios_fixup_bus(struct pci_bus* c);
- /* Functions to implement "pci ops" */
- static int galileo_pcibios_read_config_word(struct pci_dev *dev,
- int offset, u16 * val);
- static int galileo_pcibios_read_config_byte(struct pci_dev *dev,
- int offset, u8 * val);
- static int galileo_pcibios_read_config_dword(struct pci_dev *dev,
- int offset, u32 * val);
- static int galileo_pcibios_write_config_byte(struct pci_dev *dev,
- int offset, u8 val);
- static int galileo_pcibios_write_config_word(struct pci_dev *dev,
- int offset, u16 val);
- static int galileo_pcibios_write_config_dword(struct pci_dev *dev,
- int offset, u32 val);
- static void galileo_pcibios_set_master(struct pci_dev *dev);
- /*
- * General-purpose PCI functions.
- */
- /*
- * pci_range_ck -
- *
- * Check if the pci device that are trying to access does really exists
- * on the evaluation board.
- *
- * Inputs :
- * bus - bus number (0 for PCI 0 ; 1 for PCI 1)
- * dev - number of device on the specific pci bus
- *
- * Outpus :
- * 0 - if OK , 1 - if failure
- */
- static __inline__ int pci_range_ck(unsigned char bus, unsigned char dev)
- {
- /* Accessing device 31 crashes the GT-64240. */
- if (dev < 5)
- return 0;
- return -1;
- }
- /*
- * galileo_pcibios_(read/write)_config_(dword/word/byte) -
- *
- * reads/write a dword/word/byte register from the configuration space
- * of a device.
- *
- * Note that bus 0 and bus 1 are local, and we assume all other busses are
- * bridged from bus 1. This is a safe assumption, since any other
- * configuration will require major modifications to the CP7000G
- *
- * Inputs :
- * bus - bus number
- * dev - device number
- * offset - register offset in the configuration space
- * val - value to be written / read
- *
- * Outputs :
- * PCIBIOS_SUCCESSFUL when operation was succesfull
- * PCIBIOS_DEVICE_NOT_FOUND when the bus or dev is errorneous
- * PCIBIOS_BAD_REGISTER_NUMBER when accessing non aligned
- */
- static int galileo_pcibios_read_config_dword(struct pci_dev *device,
- int offset, u32* val)
- {
- int dev, bus, func;
- uint32_t address_reg, data_reg;
- uint32_t address;
- bus = device->bus->number;
- dev = PCI_SLOT(device->devfn);
- func = PCI_FUNC(device->devfn);
- /* verify the range */
- if (pci_range_ck(bus, dev))
- return PCIBIOS_DEVICE_NOT_FOUND;
- /* select the GT-64240 registers to communicate with the PCI bus */
- if (bus == 0) {
- address_reg = PCI_0CONFIGURATION_ADDRESS;
- data_reg = PCI_0CONFIGURATION_DATA_VIRTUAL_REGISTER;
- GT_WRITE(PCI_0ERROR_CAUSE, ~MASTER_ABORT_BIT);
- } else {
- address_reg = PCI_1CONFIGURATION_ADDRESS;
- data_reg = PCI_1CONFIGURATION_DATA_VIRTUAL_REGISTER;
- GT_WRITE(PCI_1ERROR_CAUSE, ~MASTER_ABORT_BIT);
- if (bus == 1)
- bus = 0;
- }
- address = (bus << 16) | (dev << 11) | (func << 8) |
- (offset & 0xfc) | 0x80000000;
- /* start the configuration cycle */
- GT_WRITE(address_reg, address);
- /* read the data */
- GT_READ(data_reg, val);
- return PCIBIOS_SUCCESSFUL;
- }
- static int galileo_pcibios_read_config_word(struct pci_dev *device,
- int offset, u16* val)
- {
- int dev, bus, func;
- uint32_t address_reg, data_reg;
- uint32_t address;
- bus = device->bus->number;
- dev = PCI_SLOT(device->devfn);
- func = PCI_FUNC(device->devfn);
- /* verify the range */
- if (pci_range_ck(bus, dev))
- return PCIBIOS_DEVICE_NOT_FOUND;
- /* select the GT-64240 registers to communicate with the PCI bus */
- if (bus == 0) {
- address_reg = PCI_0CONFIGURATION_ADDRESS;
- data_reg = PCI_0CONFIGURATION_DATA_VIRTUAL_REGISTER;
- GT_WRITE(PCI_0ERROR_CAUSE, ~MASTER_ABORT_BIT);
- } else {
- address_reg = PCI_1CONFIGURATION_ADDRESS;
- data_reg = PCI_1CONFIGURATION_DATA_VIRTUAL_REGISTER;
- GT_WRITE(PCI_1ERROR_CAUSE, ~MASTER_ABORT_BIT);
- if (bus == 1)
- bus = 0;
- }
- address = (bus << 16) | (dev << 11) | (func << 8) |
- (offset & 0xfc) | 0x80000000;
- /* start the configuration cycle */
- GT_WRITE(address_reg, address);
- /* read the data */
- GT_READ_16(data_reg + (offset & 0x3), val);
- return PCIBIOS_SUCCESSFUL;
- }
- static int galileo_pcibios_read_config_byte(struct pci_dev *device,
- int offset, u8* val)
- {
- int dev, bus, func;
- uint32_t address_reg, data_reg;
- uint32_t address;
- bus = device->bus->number;
- dev = PCI_SLOT(device->devfn);
- func = PCI_FUNC(device->devfn);
- /* verify the range */
- if (pci_range_ck(bus, dev))
- return PCIBIOS_DEVICE_NOT_FOUND;
- /* select the GT-64240 registers to communicate with the PCI bus */
- if (bus == 0) {
- address_reg = PCI_0CONFIGURATION_ADDRESS;
- data_reg = PCI_0CONFIGURATION_DATA_VIRTUAL_REGISTER;
- } else {
- address_reg = PCI_1CONFIGURATION_ADDRESS;
- data_reg = PCI_1CONFIGURATION_DATA_VIRTUAL_REGISTER;
- if (bus == 1)
- bus = 0;
- }
- address = (bus << 16) | (dev << 11) | (func << 8) |
- (offset & 0xfc) | 0x80000000;
- /* start the configuration cycle */
- GT_WRITE(address_reg, address);
- /* write the data */
- GT_READ_8(data_reg + (offset & 0x3), val);
- return PCIBIOS_SUCCESSFUL;
- }
- static int galileo_pcibios_write_config_dword(struct pci_dev *device,
- int offset, u32 val)
- {
- int dev, bus, func;
- uint32_t address_reg, data_reg;
- uint32_t address;
- bus = device->bus->number;
- dev = PCI_SLOT(device->devfn);
- func = PCI_FUNC(device->devfn);
- /* verify the range */
- if (pci_range_ck(bus, dev))
- return PCIBIOS_DEVICE_NOT_FOUND;
- /* select the GT-64240 registers to communicate with the PCI bus */
- if (bus == 0) {
- address_reg = PCI_0CONFIGURATION_ADDRESS;
- data_reg = PCI_0CONFIGURATION_DATA_VIRTUAL_REGISTER;
- } else {
- address_reg = PCI_1CONFIGURATION_ADDRESS;
- data_reg = PCI_1CONFIGURATION_DATA_VIRTUAL_REGISTER;
- if (bus == 1)
- bus = 0;
- }
- address = (bus << 16) | (dev << 11) | (func << 8) |
- (offset & 0xfc) | 0x80000000;
- /* start the configuration cycle */
- GT_WRITE(address_reg, address);
- /* write the data */
- GT_WRITE(data_reg, val);
- return PCIBIOS_SUCCESSFUL;
- }
- static int galileo_pcibios_write_config_word(struct pci_dev *device,
- int offset, u16 val)
- {
- int dev, bus, func;
- uint32_t address_reg, data_reg;
- uint32_t address;
- bus = device->bus->number;
- dev = PCI_SLOT(device->devfn);
- func = PCI_FUNC(device->devfn);
- /* verify the range */
- if (pci_range_ck(bus, dev))
- return PCIBIOS_DEVICE_NOT_FOUND;
- /* select the GT-64240 registers to communicate with the PCI bus */
- if (bus == 0) {
- address_reg = PCI_0CONFIGURATION_ADDRESS;
- data_reg = PCI_0CONFIGURATION_DATA_VIRTUAL_REGISTER;
- } else {
- address_reg = PCI_1CONFIGURATION_ADDRESS;
- data_reg = PCI_1CONFIGURATION_DATA_VIRTUAL_REGISTER;
- if (bus == 1)
- bus = 0;
- }
- address = (bus << 16) | (dev << 11) | (func << 8) |
- (offset & 0xfc) | 0x80000000;
- /* start the configuration cycle */
- GT_WRITE(address_reg, address);
- /* write the data */
- GT_WRITE_16(data_reg + (offset & 0x3), val);
- return PCIBIOS_SUCCESSFUL;
- }
- static int galileo_pcibios_write_config_byte(struct pci_dev *device,
- int offset, u8 val)
- {
- int dev, bus, func;
- uint32_t address_reg, data_reg;
- uint32_t address;
- bus = device->bus->number;
- dev = PCI_SLOT(device->devfn);
- func = PCI_FUNC(device->devfn);
- /* verify the range */
- if (pci_range_ck(bus, dev))
- return PCIBIOS_DEVICE_NOT_FOUND;
- /* select the GT-64240 registers to communicate with the PCI bus */
- if (bus == 0) {
- address_reg = PCI_0CONFIGURATION_ADDRESS;
- data_reg = PCI_0CONFIGURATION_DATA_VIRTUAL_REGISTER;
- } else {
- address_reg = PCI_1CONFIGURATION_ADDRESS;
- data_reg = PCI_1CONFIGURATION_DATA_VIRTUAL_REGISTER;
- if (bus == 1)
- bus = 0;
- }
- address = (bus << 16) | (dev << 11) | (func << 8) |
- (offset & 0xfc) | 0x80000000;
- /* start the configuration cycle */
- GT_WRITE(address_reg, address);
- /* write the data */
- GT_WRITE_8(data_reg + (offset & 0x3), val);
- return PCIBIOS_SUCCESSFUL;
- }
- static void galileo_pcibios_set_master(struct pci_dev *dev)
- {
- u16 cmd;
- galileo_pcibios_read_config_word(dev, PCI_COMMAND, &cmd);
- cmd |= PCI_COMMAND_MASTER;
- galileo_pcibios_write_config_word(dev, PCI_COMMAND, cmd);
- }
- /* Externally-expected functions. Do not change function names */
- int pcibios_enable_resources(struct pci_dev *dev)
- {
- u16 cmd, old_cmd;
- u8 tmp1;
- int idx;
- struct resource *r;
- galileo_pcibios_read_config_word(dev, PCI_COMMAND, &cmd);
- old_cmd = cmd;
- for (idx = 0; idx < 6; idx++) {
- r = &dev->resource[idx];
- if (!r->start && r->end) {
- printk(KERN_ERR
- "PCI: Device %s not available because of "
- "resource collisionsn", dev->slot_name);
- return -EINVAL;
- }
- if (r->flags & IORESOURCE_IO)
- cmd |= PCI_COMMAND_IO;
- if (r->flags & IORESOURCE_MEM)
- cmd |= PCI_COMMAND_MEMORY;
- }
- if (cmd != old_cmd) {
- galileo_pcibios_write_config_word(dev, PCI_COMMAND, cmd);
- }
- /*
- * Let's fix up the latency timer and cache line size here. Cache
- * line size = 32 bytes / sizeof dword (4) = 8.
- * Latency timer must be > 8. 32 is random but appears to work.
- */
- galileo_pcibios_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &tmp1);
- if (tmp1 != 8) {
- printk(KERN_WARNING "PCI setting cache line size to 8 from "
- "%dn", tmp1);
- galileo_pcibios_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
- 8);
- }
- galileo_pcibios_read_config_byte(dev, PCI_LATENCY_TIMER, &tmp1);
- if (tmp1 < 32) {
- printk(KERN_WARNING "PCI setting latency timer to 32 from %dn",
- tmp1);
- galileo_pcibios_write_config_byte(dev, PCI_LATENCY_TIMER,
- 32);
- }
- return 0;
- }
- int pcibios_enable_device(struct pci_dev *dev)
- {
- return pcibios_enable_resources(dev);
- }
- void pcibios_update_resource(struct pci_dev *dev, struct resource *root,
- struct resource *res, int resource)
- {
- u32 new, check;
- int reg;
- return;
- #if 0
- new = res->start | (res->flags & PCI_REGION_FLAG_MASK);
- if (resource < 6) {
- reg = PCI_BASE_ADDRESS_0 + 4 * resource;
- } else if (resource == PCI_ROM_RESOURCE) {
- res->flags |= PCI_ROM_ADDRESS_ENABLE;
- reg = dev->rom_base_reg;
- } else {
- /*
- * Somebody might have asked allocation of a non-standard
- * resource
- */
- return;
- }
- pci_write_config_dword(dev, reg, new);
- pci_read_config_dword(dev, reg, &check);
- if ((new ^ check) &
- ((new & PCI_BASE_ADDRESS_SPACE_IO) ? PCI_BASE_ADDRESS_IO_MASK :
- PCI_BASE_ADDRESS_MEM_MASK)) {
- printk(KERN_ERR "PCI: Error while updating region "
- "%s/%d (%08x != %08x)n", dev->slot_name, resource,
- new, check);
- }
- #endif
- }
- void pcibios_align_resource(void *data, struct resource *res,
- unsigned long size, unsigned long align)
- {
- struct pci_dev *dev = data;
- if (res->flags & IORESOURCE_IO) {
- unsigned long start = res->start;
- /* We need to avoid collisions with `mirrored' VGA ports
- and other strange ISA hardware, so we always want the
- addresses kilobyte aligned. */
- if (size > 0x100) {
- printk(KERN_ERR "PCI: I/O Region %s/%d too large"
- " (%ld bytes)n", dev->slot_name,
- dev->resource - res, size);
- }
- start = (start + 1024 - 1) & ~(1024 - 1);
- res->start = start;
- }
- }
- struct pci_ops galileo_pci_ops = {
- galileo_pcibios_read_config_byte,
- galileo_pcibios_read_config_word,
- galileo_pcibios_read_config_dword,
- galileo_pcibios_write_config_byte,
- galileo_pcibios_write_config_word,
- galileo_pcibios_write_config_dword
- };
- struct pci_fixup pcibios_fixups[] = {
- {0}
- };
- void __init pcibios_fixup_bus(struct pci_bus *c)
- {
- gt64240_board_pcibios_fixup_bus(c);
- }
- /********************************************************************
- * pci0P2PConfig - This function set the PCI_0 P2P configurate.
- * For more information on the P2P read PCI spec.
- *
- * Inputs: unsigned int SecondBusLow - Secondery PCI interface Bus Range Lower
- * Boundry.
- * unsigned int SecondBusHigh - Secondry PCI interface Bus Range upper
- * Boundry.
- * unsigned int busNum - The CPI bus number to which the PCI interface
- * is connected.
- * unsigned int devNum - The PCI interface's device number.
- *
- * Returns: true.
- */
- void pci0P2PConfig(unsigned int SecondBusLow,unsigned int SecondBusHigh,
- unsigned int busNum,unsigned int devNum)
- {
- uint32_t regData;
- regData = (SecondBusLow & 0xff) | ((SecondBusHigh & 0xff) << 8) |
- ((busNum & 0xff) << 16) | ((devNum & 0x1f) << 24);
- GT_WRITE(PCI_0P2P_CONFIGURATION, regData);
- }
- /********************************************************************
- * pci1P2PConfig - This function set the PCI_1 P2P configurate.
- * For more information on the P2P read PCI spec.
- *
- * Inputs: unsigned int SecondBusLow - Secondery PCI interface Bus Range Lower
- * Boundry.
- * unsigned int SecondBusHigh - Secondry PCI interface Bus Range upper
- * Boundry.
- * unsigned int busNum - The CPI bus number to which the PCI interface
- * is connected.
- * unsigned int devNum - The PCI interface's device number.
- *
- * Returns: true.
- */
- void pci1P2PConfig(unsigned int SecondBusLow,unsigned int SecondBusHigh,
- unsigned int busNum,unsigned int devNum)
- {
- uint32_t regData;
- regData = (SecondBusLow & 0xff) | ((SecondBusHigh & 0xff) << 8) |
- ((busNum & 0xff) << 16) | ((devNum & 0x1f) << 24);
- GT_WRITE(PCI_1P2P_CONFIGURATION, regData);
- }
- #define PCI0_STATUS_COMMAND_REG 0x4
- #define PCI1_STATUS_COMMAND_REG 0x84
- void __init pcibios_init(void)
- {
- /* Reset PCI I/O and PCI MEM values */
- ioport_resource.start = 0xe0000000;
- ioport_resource.end = 0xe0000000 + 0x20000000 - 1;
- iomem_resource.start = 0xc0000000;
- iomem_resource.end = 0xc0000000 + 0x20000000 - 1;
- pci_scan_bus(0, &galileo_pci_ops, NULL);
- pci_scan_bus(1, &galileo_pci_ops, NULL);
- }
- /*
- * for parsing "pci=" kernel boot arguments.
- */
- char *pcibios_setup(char *str)
- {
- printk(KERN_INFO "rr: pcibios_setupn");
- /* Nothing to do for now. */
- return str;
- }
- unsigned __init int pcibios_assign_all_busses(void)
- {
- return 1;
- }
- #endif /* CONFIG_PCI */