Hello, to everyone!
Hopefully someone can help me.
My current task is to interface an FPGA from the phyCore-AM355x module running linux 3.2.
The FPGA is connected to the CS1 of the GPMC and should be accessed synchrounos, with address and data (16bit) multiplexed. CS0 is connected to a nand flash.
My problem is that I'm not able to produce any action on the gpmc pins when I try to read something. But I can see some actions for example on the ADV pin during boot.
What I,ve done so far is:
1.) configure the pin mux with the following information:
{"gpmc_ad0.gpmc_ad0", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad1.gpmc_ad1", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad2.gpmc_ad2", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad3.gpmc_ad3", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad4.gpmc_ad4", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad5.gpmc_ad5", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad6.gpmc_ad6", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad7.gpmc_ad7", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad8.gpmc_ad8", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad9.gpmc_ad9", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad10.gpmc_ad10",OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad11.gpmc_ad11",OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad12.gpmc_ad12",OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad13.gpmc_ad13",OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad14.gpmc_ad14",OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad15.gpmc_ad15",OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_wait0.gpmc_wait0", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_wpn.gpmc_wpn", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_csn0.gpmc_csn0", OMAP_MUX_MODE0 | AM33XX_PULL_DISA},
{"gpmc_csn1.gpmc_csn1", OMAP_MUX_MODE0 | AM33XX_PULL_DISA},
{"gpmc_advn_ale.gpmc_advn_ale", OMAP_MUX_MODE0 | AM33XX_PULL_DISA},
{"gpmc_oen_ren.gpmc_oen_ren", OMAP_MUX_MODE0 | AM33XX_PULL_DISA},
{"gpmc_wen.gpmc_wen", OMAP_MUX_MODE0 | AM33XX_PULL_DISA},
{"gpmc_ben0_cle.gpmc_ben0_cle", OMAP_MUX_MODE0 | AM33XX_PULL_DISA},
{"gpmc_clk.gpmc_clk", OMAP_MUX_MODE0 | AM33XX_PULL_DISA | AM33XX_INPUT_EN},
2. request gpmc cs with gpmc_cs_request(cs, 4,&phys_base) in a platform device driver
got base address 0x01000000
3. configuring gpmc cs1 registers in a platform device driver
GPMC_CONFIG1: 0x29001200
GPMC_CONFIG2: 0x00020200
GPMC_CONFIG3: 0x22010110
GPMC_CONFIG4: 0x02016211
GPMC_CONFIG5: 0x01010202
GPMC_CONFIG6: 0x80000000
GPMC_CONFIG7: 0x00000F41
used gpmc timing struct
.sync_clk = 0,
.cs_on = 0,
.cs_rd_off = 11,
.cs_wr_off = 11,
.adv_on = 0,
.adv_rd_off = 2,
.adv_wr_off = 2,
.oe_on = 3,
.we_on = 3,
.we_off = 11,
.oe_off = 11,
.page_burst_access = 1,
.access = 10,
.rd_cycle = 11,
.wr_cycle = 11,
.cs_cycle_delay = 10,
.cs_delay_en = 0,
.wr_access = 0,
.wr_data_mux_bus = 0,
4. remap io with ioremap_nocache(phys_base, 4)
getting base address 0xE0C7A000
5. reading from address 0xE0C7A000 with ioread16(gInfo.mBaseAddr + pAddr)
and nothing happens............ no action on any pin (CS1, CLK, ADV.....)
At the moment I've no idea what I've missed or what I've done wrong.
I believe everything is ok from the linux side because the platform driver shows up in the /proc fs and cat /proc/iomem also shows my driver as well as the nand on the memory regions:
00000000-00000000 : fpga.0
01000000-01000003 : fpga
00000000-00000000 : omap2-nand.0
08000000-08000003 : omap2-nand
Maybe some one can give me a hint?
Best regard Reinhard
