arch/mips/loongson64/common/cs5536/cs5536_pci.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * read/write operation to the PCI config space of CS5536
   4  *
   5  * Copyright (C) 2007 Lemote, Inc.
   6  * Author : jlliu, liujl@lemote.com
   7  *
   8  * Copyright (C) 2009 Lemote, Inc.
   9  * Author: Wu Zhangjin, wuzhangjin@gmail.com
  10  *
  11  *      the Virtual Support Module(VSM) for virtulizing the PCI
  12  *      configure space are defined in cs5536_modulename.c respectively,
  13  *
  14  *      after this virtulizing, user can access the PCI configure space
  15  *      directly as a normal multi-function PCI device which follows
  16  *      the PCI-2.2 spec.
  17  */
  18
  19 #include <linux/types.h>
  20 #include <cs5536/cs5536_pci.h>
  21 #include <cs5536/cs5536_vsm.h>
  22
  23 enum {
  24         CS5536_FUNC_START = -1,
  25         CS5536_ISA_FUNC,
  26         reserved_func,
  27         CS5536_IDE_FUNC,
  28         CS5536_ACC_FUNC,
  29         CS5536_OHCI_FUNC,
  30         CS5536_EHCI_FUNC,
  31         CS5536_FUNC_END,
  32 };
  33
  34 static const cs5536_pci_vsm_write vsm_conf_write[] = {
  35         [CS5536_ISA_FUNC]       = pci_isa_write_reg,
  36         [reserved_func]         = NULL,
  37         [CS5536_IDE_FUNC]       = pci_ide_write_reg,
  38         [CS5536_ACC_FUNC]       = pci_acc_write_reg,
  39         [CS5536_OHCI_FUNC]      = pci_ohci_write_reg,
  40         [CS5536_EHCI_FUNC]      = pci_ehci_write_reg,
  41 };
  42
  43 static const cs5536_pci_vsm_read vsm_conf_read[] = {
  44         [CS5536_ISA_FUNC]       = pci_isa_read_reg,
  45         [reserved_func]         = NULL,
  46         [CS5536_IDE_FUNC]       = pci_ide_read_reg,
  47         [CS5536_ACC_FUNC]       = pci_acc_read_reg,
  48         [CS5536_OHCI_FUNC]      = pci_ohci_read_reg,
  49         [CS5536_EHCI_FUNC]      = pci_ehci_read_reg,
  50 };
  51
  52 /*
  53  * write to PCI config space and transfer it to MSR write.
  54  */
  55 void cs5536_pci_conf_write4(int function, int reg, u32 value)
  56 {
  57         if ((function <= CS5536_FUNC_START) || (function >= CS5536_FUNC_END))
  58                 return;
  59         if ((reg < 0) || (reg > 0x100) || ((reg & 0x03) != 0))
  60                 return;
  61
  62         if (vsm_conf_write[function] != NULL)
  63                 vsm_conf_write[function](reg, value);
  64 }
  65
  66 /*
  67  * read PCI config space and transfer it to MSR access.
  68  */
  69 u32 cs5536_pci_conf_read4(int function, int reg)
  70 {
  71         u32 data = 0;
  72
  73         if ((function <= CS5536_FUNC_START) || (function >= CS5536_FUNC_END))
  74                 return 0;
  75         if ((reg < 0) || ((reg & 0x03) != 0))
  76                 return 0;
  77         if (reg > 0x100)
  78                 return 0xffffffff;
  79
  80         if (vsm_conf_read[function] != NULL)
  81                 data = vsm_conf_read[function](reg);
  82
  83         return data;
  84 }