Add i.MX8MPlus pci driver in uboot

[#1]

Platform & BSP : i.MX8MPlus EVK , L6.12.3， uboot lf_v2024.04

The attachments enable the i.MX8MPlus pci function in uboot.

lspci in Linux

root@imx8mpevk:~# lspci -nn
00:00.0 PCI bridge [0604]: Synopsys, Inc. DWC_usb3 / PCIe bridge [16c3:abcd] (rev 01)
01:00.0 Ethernet controller [0200]: Marvell Technology Group Ltd. Device [1b4b:2b42] (rev 11)

pci test results in uboot: 

u-boot=> pci
BusDevFun  VendorId   DeviceId   Device Class       Sub-Class
_____________________________________________________________
00.00.00   0x16c3     0xabcd     Bridge device           0x04
01.00.00   0x1b4b     0x2b42     Network controller      0x00

u-boot=> pci bar 00.00.00
ID   Base                Size                Width  Type
----------------------------------------------------------
 0   0x0000000018000000  0x0000000000100000  32     MEM

u-boot=> pci regions 00
Buses 00-01
#   Bus start          Phys start         Size                Flags
0   0x0000000000000000 0x000000001ff80000 0x0000000000010000  io
1   0x0000000018000000 0x0000000018000000 0x0000000007f00000  mem
2   0x0000000040000000 0x0000000040000000 0x0000000016000000  mem sysmem
3   0x0000000058000000 0x0000000058000000 0x00000000a8000000  mem sysmem
4   0x0000000100000000 0x0000000100000000 0x00000000c0000000  mem sysmem

u-boot=> pci header 00.00.00
  vendor ID =                   0x16c3
  device ID =                   0xabcd
  command register ID =         0x0007
  status register =             0x0010
  revision ID =                 0x01
  class code =                  0x06 (Bridge device)
  sub class code =              0x04
  programming interface =       0x00
  cache line =                  0x08
  latency time =                0x00
  header type =                 0x01
  BIST =                        0x00
  base address 0 =              0x18000000
  base address 1 =              0x00000000
  primary bus number =          0x00
  secondary bus number =        0x01
  subordinate bus number =      0x01
  secondary latency timer =     0x00
  IO base =                     0x10
  IO limit =                    0x00
  secondary status =            0x0000
  memory base =                 0x1820
  memory limit =                0x1810
  prefetch memory base =        0xfff0
  prefetch memory limit =       0x0000
  prefetch memory base upper =  0x00000000
  prefetch memory limit upper = 0x00000000
  IO base upper 16 bits =       0x0000
  IO limit upper 16 bits =      0x0000
  expansion ROM base address =  0x18100000
  interrupt line =              0xff
  interrupt pin =               0x01
  bridge control =              0x0000

u-boot=> pci header 01.00.00
  vendor ID =                   0x1b4b
  device ID =                   0x2b42
  command register ID =         0x0006
  status register =             0x0010
  revision ID =                 0x11
  class code =                  0x02 (Network controller)
  sub class code =              0x00
  programming interface =       0x00
  cache line =                  0x08
  latency time =                0x00
  header type =                 0x00
  BIST =                        0x00
  base address 0 =              0x1810000c
  base address 1 =              0x00000000
  base address 2 =              0x1820000c
  base address 3 =              0x00000000
  base address 4 =              0x00000000
  base address 5 =              0x00000000
  cardBus CIS pointer =         0x00000000
  sub system vendor ID =        0x0000
  sub system ID =               0x0000
  expansion ROM base address =  0x00000000
  interrupt line =              0xff
  interrupt pin =               0x01
  min Grant =                   0x00
  max Latency =                 0x00

[xnsmx]

Hi I have an imx8qm, does that need the U-Boot patch in order to enable the PCI/PCIe function in U-Boot?

[Zhiming_Liu]

Hi @xnsmx 

No, default uboot support imx8qm.

[KennithCM_Hsu]

Hi Zhiming ：

Currently, we can correctly scan the host through the patch, but when we use PCI enumeration, it seems we cannot scan other devices. How should we modify this part?

[sypark]

Hi.

I'm using i.mx8mp. Currently I can't use PCI related commands in bootloader.

If I apply this patch, will I be able to use PCI commands in bootloader?

Could you also tell me how to apply the patch?