arch/mips/loongson/common/cs5536/cs5536_pci.c

   1 /*
   2  * read/write operation to the PCI config space of CS5536
   3  *
   4  * Copyright (C) 2007 Lemote, Inc.
   5  * Author : jlliu, liujl@lemote.com
   6  *
   7  * Copyright (C) 2009 Lemote, Inc.
   8  * Author: Wu Zhangjin, wuzhangjin@gmail.com
   9  *
  10  * This program is free software; you can redistribute  it and/or modify it
  11  * under  the terms of  the GNU General  Public License as published by the
  12  * Free Software Foundation;  either version 2 of the  License, or (at your
  13  * option) any later version.
  14  *
  15  *      the Virtual Support Module(VSM) for virtulizing the PCI
  16  *      configure space are defined in cs5536_modulename.c respectively,
  17  *
  18  *      after this virtulizing, user can access the PCI configure space
  19  *      directly as a normal multi-function PCI device which follows
  20  *      the PCI-2.2 spec.
  21  */
  22
  23 #include <linux/types.h>
  24 #include <cs5536/cs5536_vsm.h>
  25
  26 enum {
  27         CS5536_FUNC_START = -1,
  28         CS5536_ISA_FUNC,
  29         reserved_func,
  30         CS5536_IDE_FUNC,
  31         CS5536_ACC_FUNC,
  32         CS5536_OHCI_FUNC,
  33         CS5536_EHCI_FUNC,
  34         CS5536_FUNC_END,
  35 };
  36
  37 static const cs5536_pci_vsm_write vsm_conf_write[] = {
  38         [CS5536_ISA_FUNC]       pci_isa_write_reg,
  39         [reserved_func]         NULL,
  40         [CS5536_IDE_FUNC]       pci_ide_write_reg,
  41         [CS5536_ACC_FUNC]       pci_acc_write_reg,
  42         [CS5536_OHCI_FUNC]      pci_ohci_write_reg,
  43         [CS5536_EHCI_FUNC]      pci_ehci_write_reg,
  44 };
  45
  46 static const cs5536_pci_vsm_read vsm_conf_read[] = {
  47         [CS5536_ISA_FUNC]       pci_isa_read_reg,
  48         [reserved_func]         NULL,
  49         [CS5536_IDE_FUNC]       pci_ide_read_reg,
  50         [CS5536_ACC_FUNC]       pci_acc_read_reg,
  51         [CS5536_OHCI_FUNC]      pci_ohci_read_reg,
  52         [CS5536_EHCI_FUNC]      pci_ehci_read_reg,
  53 };
  54
  55 /*
  56  * write to PCI config space and transfer it to MSR write.
  57  */
  58 void cs5536_pci_conf_write4(int function, int reg, u32 value)
  59 {
  60         if ((function <= CS5536_FUNC_START) || (function >= CS5536_FUNC_END))
  61                 return;
  62         if ((reg < 0) || (reg > 0x100) || ((reg & 0x03) != 0))
  63                 return;
  64
  65         if (vsm_conf_write[function] != NULL)
  66                 vsm_conf_write[function](reg, value);
  67 }
  68
  69 /*
  70  * read PCI config space and transfer it to MSR access.
  71  */
  72 u32 cs5536_pci_conf_read4(int function, int reg)
  73 {
  74         u32 data = 0;
  75
  76         if ((function <= CS5536_FUNC_START) || (function >= CS5536_FUNC_END))
  77                 return 0;
  78         if ((reg < 0) || ((reg & 0x03) != 0))
  79                 return 0;
  80         if (reg > 0x100)
  81                 return 0xffffffff;
  82
  83         if (vsm_conf_read[function] != NULL)
  84                 data = vsm_conf_read[function](reg);
  85
  86         return data;
  87 }