LXR linux/arch/mips/pci/ops-titan-ht.c

   1/*
   2 * Copyright 2003 PMC-Sierra
   3 * Author: Manish Lachwani (lachwani@pmc-sierra.com)
   4 *
   5 *  This program is free software; you can redistribute  it and/or modify it
   6 *  under  the terms of  the GNU General  Public License as published by the
   7 *  Free Software Foundation;  either version 2 of the  License, or (at your
   8 *  option) any later version.
   9 *
  10 *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  11 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  12 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  13 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  14 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  15 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  16 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  17 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  18 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  19 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  20 *
  21 *  You should have received a copy of the  GNU General Public License along
  22 *  with this program; if not, write  to the Free Software Foundation, Inc.,
  23 *  675 Mass Ave, Cambridge, MA 02139, USA.
  24 */
  25
  26#include <linux/types.h>
  27#include <linux/pci.h>
  28#include <linux/kernel.h>
  29#include <linux/delay.h>
  30#include <asm/io.h>
  31
  32#include <asm/titan_dep.h>
  33
  34static int titan_ht_config_read_dword(struct pci_bus *bus, unsigned int devfn,
  35        int offset, u32 *val)
  36{
  37        volatile uint32_t address;
  38        int busno;
  39
  40        busno = bus->number;
  41
  42        address = (busno << 16) | (devfn << 8) | (offset & 0xfc) | 0x80000000;
  43        if (busno != 0)
  44                address |= 1;
  45
  46        /*
  47         * RM9000 HT Errata: Issue back to back HT config
  48         * transcations. Issue a BIU sync before and
  49         * after the HT cycle
  50         */
  51
  52        *(volatile int32_t *) 0xfb0000f0 |= 0x2;
  53
  54        udelay(30);
  55
  56        *(volatile int32_t *) 0xfb0006f8 = address;
  57        *(val) = *(volatile int32_t *) 0xfb0006fc;
  58
  59        udelay(30);
  60
  61        * (volatile int32_t *) 0xfb0000f0 |= 0x2;
  62
  63        return PCIBIOS_SUCCESSFUL;
  64}
  65
  66static int titan_ht_config_read(struct pci_bus *bus, unsigned int devfn,
  67        int offset, int size, u32 *val)
  68{
  69        uint32_t dword;
  70
  71        titan_ht_config_read_dword(bus, devfn, offset, &dword);
  72
  73        dword >>= ((offset & 3) << 3);
  74        dword &= (0xffffffffU >> ((4 - size) << 8));
  75
  76        return PCIBIOS_SUCCESSFUL;
  77}
  78
  79static inline int titan_ht_config_write_dword(struct pci_bus *bus,
  80        unsigned int devfn, int offset, u32 val)
  81{
  82        volatile uint32_t address;
  83        int busno;
  84
  85        busno = bus->number;
  86
  87        address = (busno << 16) | (devfn << 8) | (offset & 0xfc) | 0x80000000;
  88        if (busno != 0)
  89                address |= 1;
  90
  91        *(volatile int32_t *) 0xfb0000f0 |= 0x2;
  92
  93        udelay(30);
  94
  95        *(volatile int32_t *) 0xfb0006f8 = address;
  96        *(volatile int32_t *) 0xfb0006fc = val;
  97
  98        udelay(30);
  99
 100        *(volatile int32_t *) 0xfb0000f0 |= 0x2;
 101
 102        return PCIBIOS_SUCCESSFUL;
 103}
 104
 105static int titan_ht_config_write(struct pci_bus *bus, unsigned int devfn,
 106        int offset, int size, u32 val)
 107{
 108        uint32_t val1, val2, mask;
 109
 110        titan_ht_config_read_dword(bus, devfn, offset, &val2);
 111
 112        val1 = val << ((offset & 3) << 3);
 113        mask = ~(0xffffffffU >> ((4 - size) << 8));
 114        val2 &= ~(mask << ((offset & 3) << 8));
 115
 116        titan_ht_config_write_dword(bus, devfn, offset, val1 | val2);
 117
 118        return PCIBIOS_SUCCESSFUL;
 119}
 120
 121struct pci_ops titan_ht_pci_ops = {
 122        .read   = titan_ht_config_read,
 123        .write  = titan_ht_config_write,
 124};
 125