Hello all,
In my project i am currently using custom board TMS320DM365 with ipnc_rdk Version5.0
We have external RAMTRON FM25V02 256Kbit FRAM interfaced to DM365 through SPI2.
I want to do read write operation with the FRAM.
In the board, only spi0 was enabled.
I did the following modifications in the kernel:
In arch/arm/mach-davinci/board-dm368-ipnc.c file:
struct davinci_eeprom_info davinci_spi2_micron_info = {
.eeprom_size = 262144,
.page_size = 262144,,
.page_mask = 0x3FFFF,
.chip_sel = SCS0_SELECT,
.parts = NULL,
.nr_parts = 0,
.commit_delay = 3,
};
struct davinci_spi_config_t davinci_spi2_micron_spi_cfg = {
.wdelay = 0,
.odd_parity = 0,
.parity_enable = 0,
.wait_enable = 0,
.lsb_first = /*1,*/0,
.timer_disable = 0,
.clk_high = 1,//0,
.phase_in = 0,
.clk_internal = 1,
.loop_back = 0,
.cs_hold = 1,
.intr_level = 0,
.pin_op_modes = /*SPI_OPMODE_3PIN,*/SPI_OPMODE_SPISCS_4PIN,
#ifndef CONFIG_SPI_INTERRUPT
.poll_mode = 1,
#endif
};
static struct spi_board_info dm3xx_spi2_board_info[] = {
[0] = {
.modalias = "spidev",
.platform_data = &davinci_spi2_micron_info,
.controller_data = &davinci_spi2_micron_spi_cfg,
.mode = SPI_MODE_0,
.irq = 0,
.max_speed_hz = 14 * 1000 * 1000 /* max sample rate at 3V */ ,
.bus_num = 2,
.chip_select = 0,
},
};
dm365_init_spi2(BIT(0), dm3xx_spi2_board_info,
ARRAY_SIZE(dm3xx_spi2_board_info));
In arch/arm/mach-davinci/dm365.c file:
static u64 dm365_spi2_dma_mask = DMA_BIT_MASK(32);
static u8 chsel[1] = {33};
static struct davinci_spi_platform_data dm365_spi2_pdata = {
.version = SPI_VERSION_1,
.num_chipselect = 1,
.chip_sel = chsel,
.clk_name = "SPICLK",
};
static struct resource dm365_spi2_resources[] = {
{
.start = 0x01c67800,
.end = 0x01c67fff,
.flags = IORESOURCE_MEM,
},
{
.start = IRQ_DM365_SPIINT0_0,
.end = IRQ_DM365_SPIINT0_0,
.flags = IORESOURCE_IRQ,
},
/*//disable dma for spi currently
{
.start = 17,
.flags = IORESOURCE_DMA,
},
{
.start = 16,
.flags = IORESOURCE_DMA,
},
{
.start = EVENTQ_3,
.flags = IORESOURCE_DMA,
},
*/
};
static struct platform_device dm365_spi2_device = {
.name = "spi_davinci",
.id = 2,
.dev = {
.dma_mask = &dm365_spi2_dma_mask,
.coherent_dma_mask = DMA_BIT_MASK(32),
.platform_data = &dm365_spi2_pdata,
},
.num_resources = ARRAY_SIZE(dm365_spi2_resources),
.resource = dm365_spi2_resources,
};
void __init dm365_init_spi2(unsigned chipselect_mask,
struct spi_board_info *info, unsigned len)
{
davinci_cfg_reg(DM365_SPI2_SCLK);
davinci_cfg_reg(DM365_SPI2_SDI);
davinci_cfg_reg(DM365_SPI2_SDO);
/* not all slaves will be wired up */
if (chipselect_mask & BIT(0))
davinci_cfg_reg(DM365_SPI2_SDENA0);
if (chipselect_mask & BIT(1))
davinci_cfg_reg(DM365_SPI2_SDENA1);
spi_register_board_info(info, len);
platform_device_register(&dm365_spi2_device);
}
After doing these modifications, I was able to find /dev/spi2.0 and open this
device.But read and write wont happen. It hangs at ioctl function call.
When i probed for SPI2_CS(which is active low enabled), is still high.And also spi2 clock is not coming.
in arch/arm/mach-davinci/dm365.c file, SPI2 is muxed as follows:
MUX_CFG(DM365, SPI2_SCLK, 4, 10, 3, 1, false)
MUX_CFG(DM365, SPI2_SDI, 4, 6, 3, 1, false)
MUX_CFG(DM365, SPI2_SDO, 4, 8, 3, 1, false)
MUX_CFG(DM365, SPI2_SDENA0, 4, 12, 3, 1, false)
MUX_CFG(DM365, SPI2_SDENA1, 4, 8, 3, 2, false)
Are the SPI2 mux configurations okay?
please let me know what should be done. Is the modifications done by me correct?
Am i in the proper direction?
Also i found RAMTRON FRAM driver from the below link:
http://code.google.com/p/nixduino/source/browse/drivers/mtd/spi/ramtron.c?r=e0987e251ff0eff25a55bf8db13a41f5849f59f7
How to use this driver? How to make ramtron driver available in make menuconfig?
I am doing the spi driver for the first time.
Plaese suggest me the options.
Regards,
Arpitha
