at91sam9g45 mcp2515 linux3.6.9驱动移植要点-百检网

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at91sam9g45 mcp2515 linux3.6.9驱动移植要点

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平台at91sam9g45 linux版本 3.6.91 board-sam9m10g45ek.c 文件添加如下结构体

staticstruct mcp251x_platform_data mcp251x_info = {.oscillator_frequency = 8000000,.board_specific_setup = NULL,//&mcp251x_setup,.power_enable = NULL, //mcp251x_power_enable,.transceiver_enable = NULL,};

staticstructspi_board_info can_spi_devices[] = {{.modalias = "mcp2515",.platform_data = &mcp251x_info,.irq = AT91_PIN_PD18,.max_speed_hz = 2*1000*1000,.chip_select = 0,.bus_num = 0,.mode = SPI_MODE_0,},};在 ek_board_init函数中添加spi设备注册接口at91_add_device_spi(can_spi_devices, ARRAY_SIZE(can_spi_devices));

2 spi-atmel.c文件中修改atmel_spi_devtypes结构体，这样spi控制器才能找到对应的驱动这是这个内核版本的问题，高版本就不需要更改这个地方

static const struct platform_device_id atmel_spi_devtypes[] = {{.name = "spi-at91rm9200",.driver_data = (unsigned long) &at91rm9200_config,}, {.name = "spi-at91sam9260",.driver_data = (unsigned long) &at91sam9260_config,}, {.name = "atmel_spi", //"spi-at91sam9x5",//modify by cs 20180305 for spi.driver_data = (unsigned long) &at91sam9x5_config,}, {/* sentinel */}};

3 在mcp251x.c文件中添加#include

在函数mcp251x_open中添加flags变量和赋值语句，将spi->irq通过gpio_to_irq转为系统认识的中断号，并更改request_threaded_irq入参

unsigned long flags;int ret, irq;flags = IRQF_ONESHOT;if (pdata->irq_flags)flags |= pdata->irq_flags;elseflags |= IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING;//at91系列芯片必须同时定义上升沿和下降沿中断irq = gpio_to_irq(spi->irq);ret = request_threaded_irq(irq, NULL, mcp251x_can_ist,flags,DEVICE_NAME, priv);在函数mcp251x_stop中，添加irq变量，同样将spi->irq通过gpio_to_irq转为系统认识的中断号，并更改free_irq的入参int irq;irq = gpio_to_irq(spi->irq);free_irq(irq, priv);在mcp251x_can_ist函数开始位置添加如下代码，屏蔽上升沿中断int val=gpio_get_value(spi->irq);if (val==1) return IRQ_NONE;4 编译1 关闭dtsBoot options --->[ ] Flattened Device Tree support

2 选择支持can芯片mcp251x[*] Networking support ---> CAN bus subsystem support --->--- CAN bus subsystem support Raw CAN Protocol (raw access with CAN-ID filtering) Broadcast Manager CAN Protocol (with content filtering) CAN Gateway/Router (with netlink configuration)CAN Device Drivers ---> Virtual Local CAN Interface (vcan) Serial / USB serial CAN Adaptors (slcan) Platform CAN drivers with Netlink support[*] CAN bit-timing calculation Atmel AT91 onchip CAN controller Microchip MCP251x SPI CAN controllers Philips/NXP SJA1000 devices ---> Bosch C_CAN/D_CAN devices ---> Bosch CC770 and Intel AN82527 devices --->CAN USB interfaces ---> Softing Gmbh CAN generic support[*] CAN devices debugging messages3 选择支持spi[*] SPI support --->--- SPI support[*] Debug support for SPI drivers*** SPI Master Controller Drivers *** Altera SPI Controller Atmel SPI Controller Utilities for Bitbanging SPI masters GPIO-based bitbanging SPI Master OpenCores tiny SPI Analog Devices AD-FMCOMMS1-EBZ SPI-I2C-bridge driver Xilinx SPI controller common module DesignWare SPI controller core support*** SPI Protocol Masters *** User mode SPI device driver support Infineon TLE62X0 (for power switching)4测试can编译 iproute和canutils并拷贝到设备文件系统中./ip link set can0 down./ip link set can0 type can bitrate 125000./ip link set can0 up./cansend can0 -i 0x800 -e 0x11 0x22 0x33 0x44 0x55 0x66 0x77 0x88 //-e为扩展帧

./cansend can0 -i 0x00 0x11 0x22 0x33 0x44 0x55 0x66 0x77 0x88

./cansend can0 -i 0x02 0x11 0x12 --loop=20./candump can0

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