arch/mips/loongson64/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_pci.h>
  25 #include <cs5536/cs5536_vsm.h>
  26
  27 enum {
  28         CS5536_FUNC_START = -1,
  29         CS5536_ISA_FUNC,
  30         reserved_func,
  31         CS5536_IDE_FUNC,
  32         CS5536_ACC_FUNC,
  33         CS5536_OHCI_FUNC,
  34         CS5536_EHCI_FUNC,
  35         CS5536_FUNC_END,
  36 };
  37
  38 static const cs5536_pci_vsm_write vsm_conf_write[] = {
  39         [CS5536_ISA_FUNC]       = pci_isa_write_reg,
  40         [reserved_func]         = NULL,
  41         [CS5536_IDE_FUNC]       = pci_ide_write_reg,
  42         [CS5536_ACC_FUNC]       = pci_acc_write_reg,
  43         [CS5536_OHCI_FUNC]      = pci_ohci_write_reg,
  44         [CS5536_EHCI_FUNC]      = pci_ehci_write_reg,
  45 };
  46
  47 static const cs5536_pci_vsm_read vsm_conf_read[] = {
  48         [CS5536_ISA_FUNC]       = pci_isa_read_reg,
  49         [reserved_func]         = NULL,
  50         [CS5536_IDE_FUNC]       = pci_ide_read_reg,
  51         [CS5536_ACC_FUNC]       = pci_acc_read_reg,
  52         [CS5536_OHCI_FUNC]      = pci_ohci_read_reg,
  53         [CS5536_EHCI_FUNC]      = pci_ehci_read_reg,
  54 };
  55
  56 /*
  57  * write to PCI config space and transfer it to MSR write.
  58  */
  59 void cs5536_pci_conf_write4(int function, int reg, u32 value)
  60 {
  61         if ((function <= CS5536_FUNC_START) || (function >= CS5536_FUNC_END))
  62                 return;
  63         if ((reg < 0) || (reg > 0x100) || ((reg & 0x03) != 0))
  64                 return;
  65
  66         if (vsm_conf_write[function] != NULL)
  67                 vsm_conf_write[function](reg, value);
  68 }
  69
  70 /*
  71  * read PCI config space and transfer it to MSR access.
  72  */
  73 u32 cs5536_pci_conf_read4(int function, int reg)
  74 {
  75         u32 data = 0;
  76
  77         if ((function <= CS5536_FUNC_START) || (function >= CS5536_FUNC_END))
  78                 return 0;
  79         if ((reg < 0) || ((reg & 0x03) != 0))
  80                 return 0;
  81         if (reg > 0x100)
  82                 return 0xffffffff;
  83
  84         if (vsm_conf_read[function] != NULL)
  85                 data = vsm_conf_read[function](reg);
  86
  87         return data;
  88 }