IMX6DL PCIE BAR地址映射后无法读写

lie_go · 发表于 2020-3-31 12:23:34

我们使用IMX6DualLite，通过PCIE接口连接一个采集卡，该采集卡原来使用在X86平台驱动正常。现在改用IMX6DualLite时，能识别到该设备ID信息，能读取BAR地址，将BAR地址使用ioremap映射为虚拟地址后，使用readl读取虚拟地址，返回全为零。
BAR地址调试打印信息如下：

BAR0: Reg 0x01100000, Map mem, Adrs 0x01100000, Size 256, vaddr 0xC0B69000, Access RO

BAR1: Reg 0x00001001, Map I/O, Adrs 0x00001000, Size 256, vaddr 0x0, Access RO

BAR2: Reg 0x01100100, Map mem, Adrs 0x01100100, Size 256, vaddr 0xC0B71100, Access RW

BAR3: Reg 0x00000000, Map N/A, Adrs 0x00000000, Size 0, vaddr 0x0, Access RO

BAR4: Reg 0x00000000, Map N/A, Adrs 0x00000000, Size 0, vaddr 0x0, Access RO

BAR5: Reg 0x00000000, Map N/A, Adrs 0x00000000, Size 0, vaddr 0x0, Access RO

Mem Mx u32: rx 00000000, M 0000000F, V 0000000C, tx 0000000C: va 0xC0B6906C

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lie_go · 发表于 2020-3-31 12:25:22

1、开机启动时pcie的信息

pci 0000:02:00.0: BAR 0: assigned [mem 0x01100000-0x011000ff]

pci 0000:02:00.0: BAR 1: assigned [io  0x1000-0x10ff]

pci 0000:02:00.0: BAR 2: assigned [mem 0x01100100-0x011001ff]

2、lspci命令查询

00:00.0 PCI bridge: Device 16c3:abcd (rev 01)

01:00.0 PCI bridge: Tundra Semiconductor Corp. Device 8111 (rev 02)

02:00.0 Signal processing controller: PLX Technology, Inc. PCI9080 32-bit; 33MHz PCI <-> IOBus Bridge (rev 03)

3、pcie 24dsi采集卡驱动的内存映射

BAR0: Reg 0x01100000, Map mem, Adrs 0x01100000, Size  256, vaddr 0xC0A41000, Access RO

BAR1: Reg 0x00001000, Map I/O, Adrs 0x00001000, Size  256, vaddr 0x1000, Access RO

BAR2: Reg 0x01100100, Map mem, Adrs 0x01100100, Size  256, vaddr 0xC0A49100, Access RW

4、驱动内存访问

Mem Mx u32: rx 00000000, M 0000000F, V 0000000C, tx 0000000C: va 0xC0A4106C

读取0xC0A4106C的值为00000000

读取调用函数readl()