PCI地址映射的疑问（欢迎熟悉的DX进来指教） (amobbs.com 阿莫电子技术论坛) -

fenglouto 发表于 2009-12-17 15:25:49

PCI地址映射的疑问（欢迎熟悉的DX进来指教）

对于地址映射我是这么理解的，不知道是不是正确？
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对于PCI来说地址分为两部分地址，一个是系统地址，这个地址是对驱动开发人员来说的。一个是本地存储地址，这个是对本地端用户来说的(例如FPGA控制9054，FPGA就是本地用户)，对驱动开发人员来说只有系统地址可见，本地地址是不可见的，对于本地端用户来说，系统地址是不可见的，他只管本地地址，这中间就存在一个映射的问题，或者还有操作系统按资源分配的问题？？
对于这些映射9054有三个寄存器来完成，分别是系统配置寄存器BAR，本地配置寄存器LASxRR,LASxBA，(为了方便说明,用BAR2,LAS0RR,LAS0BA)。
LAS0RR是本地端地址的范围，里面的值是地址范围取反加一，最低4位(对于memory)，或者最低2位(对于IO)是固定属性，这个由系统分配(BIOS),只能读不能写。
LAS0BA的值是LASORR的倍数，如果LAS0RR是1M的地址范围，那么LAS0BA就是0M,1M，2M，3M等等
BAR2是系统地址的偏移地址

在应用程序开发操作硬件的时候，开发人员通过BAR2+offset对9054进行操作，这个地址可以找到PCI9054芯片的内部，然后，PCI9054芯片再把这个PCI地址进行重映射到Local端的内存空间地址，这一步根据LAS0RR寄存器的设置，然后把Local端基址寄存器的高位替换即所谓的重映射。
例如对1M大小的memory进行操作，BAR2里设置的值是7890 0000，那么对于开发人员来说他所知道的地址是0x7890 0000h + offset，9054会根据LAS0RR的值把高12位替换掉，LAS0RR里有多少个1就替换多少位。假设LAS0BA的值为FFE0 0000那么对于本地端用户能看见的地址就是FFE0 0000 + offset
从7890 0000 + offset -------- FFE0 0000 + offset就完成了映射
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不知道是不是这样映射的？欢迎各位指教，另外还有一个问题

PCI可以映射本地两个空间，space0,space1,当这两个空间都要用到时，本地端地址总线上改怎么译码呢？

dspsharc 发表于 2009-12-17 16:54:46

桥片技术实际就是REMAP技术&开窗技术
CPU 地址 <=> PCI 地址 <=> LOCAL 地址
在一般系统里 CPU 地址等于 PCI 地址
你可参考我若干年前做的,早忘了具体定义,得自己芯片看PDF.

-> sysPciShow with PMC
0 0 ID 0x00041057 Motorola, Rev. 1.3
0 5 ID 0x826010e3 Tundra Semiconductor Corp., Rev. 0.1
0 6 ID 0x00061000 SYM 53C860 Ultra SCSI/Narrow, Rev. 0.2
0 8 ID 0x000010e3 Tundra CA91C042 VMEbus Bridge, Rev. 0.2
0 9 0 ID 0x056510ad Symphony W83C553F ISA bridge, Rev. 1.0
0 9 1 ID 0x010510ad Symphony W83C553F IDE controller, Rev. 0.5
0 11 ID 0x00191011 DEC DC21143 PCI/CardBus 10/100 Mbit Ethernet Ctlr, Rev. 4.1
0 14 ID 0x965610b5 PLX Technology, Rev. b.a
value = 0 = 0x0
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-> k0
--------------------------------
sysClkRateGet = 60 , sysAuxClkRateGet = 60
--------------------------------
PLX 9656 PCI card found!
busNo = 0x00000000
deviceNo = 0x0000000e
funcNo = 0x00000000
pDp    = 0x01aa17c0
--------------------------------
base address 0 =       PCI(0x80110000) CPU(0x80110000)
base address 1 =       PCI(0x04000001) CPU(0xf4000000)
base address 2 =       PCI(0x80100000) CPU(0x80100000)
base address 3 =       PCI(0x80000000) CPU(0x80000000)
base address 4 =       PCI(0x00000000) CPU(0x00000000)
base address 5 =       PCI(0x00000000) CPU(0x00000000)
interrupt line =       0x09
interrupt pin =       0x01
--------------------------------
PCI Local configuration
--------------------------------
P9656_BIGEND= 0x00300500
P9656_CNTRL = 0x100d767e
P9656_INTCSR= 0x0f0c0800
P9656_LBRD0 = 0x4a03014f
P9656_LBRD1 = 0x000001c3
P9656_MARBR = 0x012300ff
P9656_DMAARB= 0x012300ff
value = 0 = 0x0
-> pmce2read(&pD)
--------------------------------
Access serial EERPOM
--------------------------------
00: 965610b5ff0000ba8040010900000000
10: 00000000ffff000000000001012300ff
20: 0030050000000000000000004a03014f
30: 00000000000000000000000000000000
40: 00000000965610b5fff0000000100001
50: 000001c300004c060000000000024801
60: 00000000000000000000000000000000
70: 00000000000000000000000000000000
80: 00000000000000000000000000000000
90: 00000000000000000000000000000000
a0: 00000000000000000000000000000000
b0: 00000000000000000000000000000000
c0: 00000000000000000000000000000000
d0: 00000000000000000000000000000000
e0: 00000000000000000000000000000000
f0: 00000000000000000000000000000000
value = 0 = 0x0
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-> speedit
--------------------------------
sysClkRateGet = 60 , sysAuxClkRateGet = 60
--------------------------------
PLX 9656 PCI card found!
busNo = 0x00000000
deviceNo = 0x0000000e
funcNo = 0x00000000
pDp    = 0x01aa17c0
--------------------------------
base address 0 =       PCI(0x80110000) CPU(0x80110000)
base address 1 =       PCI(0x04000001) CPU(0xf4000000)
base address 2 =       PCI(0x80100000) CPU(0x80100000)
base address 3 =       PCI(0x80000000) CPU(0x80000000)
base address 4 =       PCI(0x00000000) CPU(0x00000000)
base address 5 =       PCI(0x00000000) CPU(0x00000000)
interrupt line =       0x09
interrupt pin =       0x01
--------------------------------
PCI Local configuration
--------------------------------
P9656_BIGEND= 0x00300500
P9656_CNTRL = 0x100d767e
P9656_INTCSR= 0x0f0c0980
P9656_LBRD0 = 0x4a03014f
P9656_LBRD1 = 0x000001c3
P9656_MARBR = 0x012300ff
P9656_DMAARB= 0x012300ff
--------------------------------

--------------------------------
PMC DMA1 speed test
--------------------------------
writebuf:0x002d6d50(PCI 0x402d6d50) offset:0-0xffff
readbuf :0x002e6fc0(PCI 0x402e6fc0) offset:0-0xffff
900.0ms 65536.0KB 72.818MB/s for DMA Write Block
433.3ms 65536.0KB 151.237MB/s for DMA Read Block
--------------------------------
PMC DMA0 speed test
--------------------------------
writebuf:0x002d6d50(PCI 0x402d6d50) offset:0-0xffff
readbuf :0x002e6fc0(PCI 0x402e6fc0) offset:0-0xffff
900.0ms 65536.0KB 72.818MB/s for DMA Write Block
450.0ms 65536.0KB 145.635MB/s for DMA Read Block
value = 49 = 0x31 = '1'

翻出老掉压的FPGA程序,可以看出PLX9656的PCI和LOCAL对应地址关系(PLX9054是PLX9656的简化版)

--PCI PCIBAR2~PCIBAR2+0x0000ffff <=> Local 0x00000000~0x0000ffff 64KBytes
--LAS0RR=0xffff0000
--LAS0BA=0x00000001
--
--ADDR ADDR ADDR
--ADDR=H"000" decode BAR2
CONSTANT BAR2_ = H"000";
--ADDR must = H"0" , ADDR
CONSTANT BAR2_H0 = H"00"; --decode for FPGA's inner reg
CONSTANT BAR2_H1 = H"01"; --decode for Z16C30 reg
--BAR2_H0 & ADDR --ADDR
CONSTANT LED_CNTR_OFFSET = H"000"; --H"000" D W/R , default bit ERRFLAG_OKFLAG_HPSEL_LEDSEL_LED3_LED2_LED1_LED0 is 00_0000_0000_0000
CONSTANT CH1_DIR_OFFSET = H"001"; --H"004" D W/R , default bit DCD_CTS_TXD_TXC_RXD_RXC is 001100 ("0" RS422 in;"1" RS422 out)
CONSTANT CH2_DIR_OFFSET = H"002"; --H"008" D W/R , default bit DCD_CTS_TXD_TXC_RXD_RXC is 001100 ("0" RS422 in;"1" RS422 out)
CONSTANT SIMP_N_OFFSET = H"003"; --H"00c" D W/R , default send 256 SIMP
CONSTANT SIMP_TIME_OFFSET = H"004"; --H"010" D W/R , default 5156*0.9697us=5ms SIMP
CONSTANT INT_EN_OFFSET = H"005"; --H"014" D W/R , default is 0
CONSTANT INT_VECT_OFFSET = H"006"; --H"018" D R , read bit USC2RX_USC2TX_USC1RX_USC1TX_FPDPRM_FPDPTM_SIMP
CONSTANT INT_CLR_OFFSET = H"007"; --H"01c" D W , write BITx="1" will clear INTx
--FPDP output clk(CLK20M->CLK20M1->SEL0CLK) delay selector
CONSTANT FPDP_SEL0D_OFFSET = H"008"; --H"020" D W/R , default bit CLK20MD5_CLK20MD4_CLK20MD3_CLK20MD2_CLK20MD1_CLK20M1 is 111110 ("0" SEL Enable;"1" SEL Disable)
--FPDP input clk(SEL2CLK->EXT20M->SEL1CLK)delay selector
CONSTANT FPDP_SEL1D_OFFSET = H"009"; --H"024" D W/R , default bit EXT20MD5_EXT20MD4_EXT20MD3_EXT20MD2_EXT20MD1_EXT20Mis 111110 ("0" SEL Enable;"1" SEL Disable)
--FPDP input, SEL2D set SEL2CLK source , default bit PECLCLK_TTLCLKis 10 ("0" SEL Enable;"1" SEL Disable)
--FPDP i/o , SEL2D set FPDPCLK source , default bit SEL1CLK_CLK20M2 is 01 ("0" SEL Enable;"1" SEL Disable)
----FPDP o    , OSC->CLK20M->CLK20M2->FPDPCLK->FPGA          , SEL2D="10"
----FPDP i    , STROBE->SEL2CLK->EXT20M->SEL1CLK->FPDPCLK->FPGA , SEL2D="01" , default
CONSTANT FPDP_SEL2D_OFFSET = H"00a"; --H"028" DW/R , default is 0110
--FPDP output , SEL3D set TTLCLK out, default bit is 1 ("0" EN)
--FPDP output , SEL3D set PECLCLK out , default bit is 1 ("0" EN)
--FPDP i/o , SEL3D set PECL termination method , default bit METHOD3_METHOD2_METHOD1 is 110 ("0" SEL Enable;"1" SEL Disable)
----term method 1 : 167/250 by FPDP/TM or FPDP/RM
----term method 2 : 330 by FPDP/TM
----term method 3 : 110 by FPDP/RM
CONSTANT FPDP_SEL3D_OFFSET = H"00b"; --H"02c" D W/R , default is 11011
--SEL4D set FPDP/TM SUSPEND* term ("0" EN) , SUSPEND* asserted by FPDP/R or FPDP/RM
--SEL4D set FPDP/TM NRDY* term ("0" EN) , NRDY* asserted by FPDP/R or FPDP/RM
--SEL4D set FPDP/RM DIR* term ("0" EN) , DIR* asserted by FPDP/TM
--SEL4D set FPDP/RM STROB term ("0" EN) , STROB asserted by FPDP/TM
----FPDP/RM , SEL4D = "0011"
----FPDP/TM , SEL4D = "1100"
CONSTANT FPDP_SEL4D_OFFSET = H"00c"; --H"030" D W/R , default is 0011
--FPDP_CNTR FPDP_MODE (W/R , default is 00 , mode0)
-- mode0 : FIFO loopback, FPDP_CNTR = "00"
-- mode1 : FPDP/RM input, FPDP_CNTR = "01"
-- mode2 : FPDP/TM output , FPDP_CNTR = "10"
--FPDP_CNTR RM_NRDYn_OUT (W/R , default is 0 , NRDY* output 0)
--FPDP_CNTR TM_SYNCn_OUT (W , default is 1 , SYNC* output no 0 pulse)
--FPDP_CNTR TM_SUSPENDn_EN (W/R , default is 0 , FPDP/RM's SUSPEND* will not suspend FPDP/TM send)
--FPDP_CNTR TM_NRDYn_EN (W/R , default is 0 , FPDP/RM's NRDY* will not suspend FPDP/TM send)
--FPDP_CNTR RM_SYNCn_EN (W/R , default is 0 , FPDP/TM's SYNC* will not use as frame begin)
--FPDP_CNTR FPDP_FIFO_RST (W/R , default is 1 , FPDP fifo will not aclr by reg)
--FPDP_CNTR FPDP_RST_DVEN (W/R , default is 0 , FPDP fifo will not aclr after DVALIDn"1" 350us)
--
--FPDP_CNTR RM_DIRn_STATUS (R , FPDP/RM's DIR*    is input)
--FPDP_CNTR TM_SUSPENDn_STATUS (R , FPDP/TM's SUSPEND* is input)
--FPDP_CNTR TM_NRDYn_STATUS (R , FPDP/TM's NRDY* is input)
CONSTANT FPDP_CNTR_OFFSET = H"00d"; --H"034" D W/R , default is XXX010001000 (D R only)
--FPDP/RM FIFO HALF FULL
CONSTANT FPDP_FIFOHF_OFFSET = H"00e"; --H"038" D W/R
--FPDP/TM DMA SEND COUNT for fifo empty ok
CONSTANT FPDP_SENDCT_OFFSET = H"00f"; --H"03c" D W/R
--FPDP FIFO STATUS
CONSTANT FPDP_FIFOS_OFFSET = H"010"; --H"040" D R
--USC1_CNTR USC1_DMAW_EN (W/R , default is 0 , USC1 fifo will not DMAW for TxREQn)
--USC1_CNTR USC1_DMAR_EN (W/R , default is 0 , USC1 fifo will not DMAR for RxREQn)
--USC1_CNTR USC1_FIFORX_RST (W/R , default is 1 , USC1 rxfifo will not aclr)
--USC1_CNTR USC1_FIFOTX_RST (W/R , default is 1 , USC1 txfifo will not aclr)
CONSTANT USC1_CNTR_OFFSET = H"011"; --H"044" D W/R , default is 10000000
--USCRX1 FIFO HALF FULL
CONSTANT USC1_FIFOHF_OFFSET = H"012"; --H"048" D W/R
--USCTX1 DMA SEND COUNT for fifo empty ok
CONSTANT USC1_SENDCT_OFFSET = H"013"; --H"04c" D W/R
--USC1 FREQ DIV
CONSTANT USC1_FREQ_OFFSET = H"014"; --H"050" D W/R
--USC1 FIFO STATUS
CONSTANT USC1_FIFOS_OFFSET = H"015"; --H"054" D R
--USC2_CNTR USC2_DMAW_EN (W/R , default is 0 , USC2 fifo will not DMAW for TxREQn)
--USC2_CNTR USC2_DMAR_EN (W/R , default is 0 , USC2 fifo will not DMAR for RxREQn)
--USC2_CNTR USC2_FIFORX_RST (W/R , default is 1 , USC2 rxfifo will not aclr)
--USC2_CNTR USC2_FIFOTX_RST (W/R , default is 1 , USC2 txfifo will not aclr)
CONSTANT USC2_CNTR_OFFSET = H"016"; --H"058" D W/R , default is 10000000
--USCRX2 FIFO HALF FULL
CONSTANT USC2_FIFOHF_OFFSET = H"017"; --H"05c" D W/R
--USCTX2 DMA SEND COUNT for fifo empty ok
CONSTANT USC2_SENDCT_OFFSET = H"018"; --H"060" D W/R
--USC2 FREQ DIV
CONSTANT USC2_FREQ_OFFSET = H"019"; --H"064" D W/R
--USC2 FIFO STATUS
CONSTANT USC2_FIFOS_OFFSET = H"01a"; --H"068" D R
--FPDP DV RST FIFO DELAY TIME
CONSTANT FPDP_DVRST_OFFSET = H"01b"; --H"06c" D W/R

--BAR2_H1 & ADDR
--Z16C30's AD is U/Ln = 0
--Z16C30's AD <=>DLA
--Z16C30's AD is B/Wn = 0
--Z16C30's D/Cn <=>DLA
--Z16C30's A/Bn <=> !DLA

--PCI PCIBAR3~PCIBAR3+0x000fffff <=> Local 0x00100000~0x001fffff 1024KBytes
--LAS1RR=0xfff00000
--LAS1BA=0x00100001
--
--ADDR=H"001" decode BAR3
CONSTANT BAR3_ = H"001";
--ADDR
CONSTANT BAR3_H0 = H"0"; --decode for FPDP's t/r FIFO (ADDR space is 16K*32bit/64Kbytes)
CONSTANT BAR3_H1 = H"1"; --decode for USCx's t/r FIFO
--ADDR
CONSTANT BAR3_H1_H0 = B"00"; --decode for USC1's t/r FIFO (ADDR space is 4K*32bit/16Kbytes)
CONSTANT BAR3_H1_H1 = B"01"; --decode for USC2's t/r FIFO (ADDR space is 4K*32bit/16Kbytes)
CONSTANT BAR3_H1_H2 = B"10"; --NC
CONSTANT BAR3_H1_H3 = B"11"; --NC

dspsharc 发表于 2009-12-17 17:20:38

Access serial EERPOM
--------------------------------
00: 965610b5ff0000ba8040010900000000
10: 00000000ffff000000000001012300ff
20: 0030050000000000000000004a03014f
30: 00000000000000000000000000000000
40: 00000000965610b5fff0000000100001
50: 000001c300004c060000000000024801

--PCI PCIBAR2~PCIBAR2+0x0000ffff <=> Local 0x00000000~0x0000ffff 64KBytes
--LAS0RR=0xffff0000
--LAS0BA=0x00000001

--PCI PCIBAR3~PCIBAR3+0x000fffff <=> Local 0x00100000~0x001fffff 1024KBytes
--LAS1RR=0xfff00000
--LAS1BA=0x00100001
--
看到这些你就应该明白了.至于PCI侧的地址,是OS自动配出来的

fenglouto 发表于 2009-12-17 17:29:19

看您的EEPROM里的值
BAR0 00000000
BAR1 FFFF0000
BAR2 00000001
BAR3 012300FF
BAR4 00300500

BAR4不是保留寄存器，怎么还有值呢？

另外
--PCI PCIBAR2~PCIBAR2+0x0000ffff <=> Local 0x00000000~0x0000ffff 64KBytes
--LAS0RR=0xffff0000
--LAS0BA=0x00000001

--PCI PCIBAR3~PCIBAR3+0x000fffff <=> Local 0x00100000~0x001fffff 1024KBytes
--LAS1RR=0xfff00000
--LAS1BA=0x00100001

您LAS0BA,LAS1BA的最低为都设为1，那都map到I/O space了吧。

您的代码里是用作为space0，space1空间的译码，本地端要知道LAS0BA,LAS1BA的值才能译码，但是本地端应该是不会去读这些寄存器的，那么怎么知道这些值呢？是不是开发之前就协商好了，LASOBA，BAS1BA设置什么样的值会告诉本地控制端？

非常感谢！

fenglouto 发表于 2009-12-17 18:19:34

我看9656DMA的时序图，DMA操作时，写地址为0x128的寄存器DMACSRO,地址总线上的值是 0x0800004a，那么BAR0的值是不是设置为0x08000000？

dspsharc 发表于 2009-12-17 22:31:03

“本地端应该是不会去读这些寄存器的，那么怎么知道这些值呢？”

你应该去了解PCI协议，PCI侧的地址空间（-----PCI的BAR-----）是OS自动分配的。
--LAS0RR=0xffff0000
--LAS0BA=0x00000001
--LAS1RR=0xfff00000
--LAS1BA=0x00100001 等都是------局部总线-----的，决定局部总线REMAP的关系及窗口大小。

“您LAS0BA,LAS1BA的最低为都设为1，那都map到I/O space了吧。 ”此BAR非PCI的BAR，1含义不是那样的，建议认真看PDF

fenglouto 发表于 2009-12-18 10:04:48

LASxBA最低位是我记错了，应该是enable。
非常感谢！！！

dbx12358 发表于 2012-6-5 14:44:05

嗯，很详细。

wangshaosh123 发表于 2012-6-5 21:58:50

~~~~看下王齐的那本PCIe的书讲的不错

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PCI地址映射的疑问（欢迎熟悉的DX进来指教）