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 26enum { 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 37static 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 46static 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 */ 58void 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 */ 72u32 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} 88