Freescale MPC85XX系列BSP各设备注册浅析

这几天项目不太忙，于是抽空看了一下关于BSP相关的东西，记下来跟大家分享一下。

我们公司用的产品主要是freescale公司的powerpc系列，期中MPC8548，MPC8572用的比较多。由于要给老外做整个板卡上硬件的测试工作，所以对于板上资源是必须要了解的。本篇文章的侧重点在于板上各设备是如何注册的（只讲设备注册，不讲驱动注册），而对于板上有哪些资源，datasheet上都写得明明白白，在此不再赘述。

 

好了，我们先查看一下在linux-2.6.23内核上的MPC85XX系列的板级资源文件

arch/ppc/syslib/mpc85xx_devices.c

由于文件太大，我把主要部分列出来

static struct fs_platform_info mpc85xx_fcc1_pdata = {.fs_no = fsid_fcc1,.cp_page = CPM_CR_FCC1_PAGE,.cp_block = CPM_CR_FCC1_SBLOCK,.rx_ring = 32,.tx_ring = 32,.rx_copybreak = 240,.use_napi = 0,.napi_weight = 17,.clk_mask= CMX1_CLK_MASK,.clk_route= CMX1_CLK_ROUTE,.clk_trx= (PC_F1RXCLK | PC_F1TXCLK),.mem_offset = FCC1_MEM_OFFSET,};static struct fs_platform_info mpc85xx_fcc2_pdata = {.fs_no = fsid_fcc2,.cp_page = CPM_CR_FCC2_PAGE,.cp_block = CPM_CR_FCC2_SBLOCK,.rx_ring = 32,.tx_ring = 32,.rx_copybreak = 240,.use_napi = 0,.napi_weight = 17,.clk_mask= CMX2_CLK_MASK,.clk_route= CMX2_CLK_ROUTE,.clk_trx= (PC_F2RXCLK | PC_F2TXCLK),.mem_offset = FCC2_MEM_OFFSET,};static struct fs_platform_info mpc85xx_fcc3_pdata = {.fs_no = fsid_fcc3,.cp_page = CPM_CR_FCC3_PAGE,.cp_block = CPM_CR_FCC3_SBLOCK,.rx_ring = 32,.tx_ring = 32,.rx_copybreak = 240,.use_napi = 0,.napi_weight = 17,.clk_mask= CMX3_CLK_MASK,.clk_route= CMX3_CLK_ROUTE,.clk_trx= (PC_F3RXCLK | PC_F3TXCLK),.mem_offset = FCC3_MEM_OFFSET,};static struct plat_serial8250_port serial_platform_data[] = {[0] = {.mapbase= 0x4500,.irq= MPC85xx_IRQ_DUART,.iotype= UPIO_MEM,.flags= UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ,},[1] = {.mapbase= 0x4600,.irq= MPC85xx_IRQ_DUART,.iotype= UPIO_MEM,.flags= UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ,},{ },};struct platform_device ppc_sys_platform_devices[] = {[MPC85xx_TSEC1] = {.name = "fsl-gianfar",.id= 1,.dev.platform_data = &mpc85xx_tsec1_pdata,.num_resources = 4,.resource = (struct resource[]) {{.start= MPC85xx_ENET1_OFFSET,.end= MPC85xx_ENET1_OFFSET +MPC85xx_ENET1_SIZE - 1,.flags= IORESOURCE_MEM,},{.name= "tx",.start= MPC85xx_IRQ_TSEC1_TX,.end= MPC85xx_IRQ_TSEC1_TX,.flags= IORESOURCE_IRQ,},{.name= "rx",.start= MPC85xx_IRQ_TSEC1_RX,.end= MPC85xx_IRQ_TSEC1_RX,.flags= IORESOURCE_IRQ,},{.name= "error",.start= MPC85xx_IRQ_TSEC1_ERROR,.end= MPC85xx_IRQ_TSEC1_ERROR,.flags= IORESOURCE_IRQ,},},},[MPC85xx_TSEC2] = {.name = "fsl-gianfar",.id= 2,.dev.platform_data = &mpc85xx_tsec2_pdata,.num_resources = 4,.resource = (struct resource[]) {{.start= MPC85xx_ENET2_OFFSET,.end= MPC85xx_ENET2_OFFSET +MPC85xx_ENET2_SIZE - 1,.flags= IORESOURCE_MEM,},{.name= "tx",.start= MPC85xx_IRQ_TSEC2_TX,.end= MPC85xx_IRQ_TSEC2_TX,.flags= IORESOURCE_IRQ,},{.name= "rx",.start= MPC85xx_IRQ_TSEC2_RX,.end= MPC85xx_IRQ_TSEC2_RX,.flags= IORESOURCE_IRQ,},{.name= "error",.start= MPC85xx_IRQ_TSEC2_ERROR,.end= MPC85xx_IRQ_TSEC2_ERROR,.flags= IORESOURCE_IRQ,},},},[MPC85xx_FEC] ={.name = "fsl-gianfar",.id= 3,.dev.platform_data = &mpc85xx_fec_pdata,.num_resources = 2,.resource = (struct resource[]) {{.start= MPC85xx_ENET3_OFFSET,.end= MPC85xx_ENET3_OFFSET +MPC85xx_ENET3_SIZE - 1,.flags= IORESOURCE_MEM,},{.start= MPC85xx_IRQ_FEC,.end= MPC85xx_IRQ_FEC,.flags= IORESOURCE_IRQ,},},},[MPC85xx_IIC1] = {.name = "fsl-i2c",.id= 1,.dev.platform_data = &mpc85xx_fsl_i2c_pdata,.num_resources = 2,.resource = (struct resource[]) {{.start= MPC85xx_IIC1_OFFSET,.end= MPC85xx_IIC1_OFFSET +MPC85xx_IIC1_SIZE - 1,.flags= IORESOURCE_MEM,},{.start= MPC85xx_IRQ_IIC1,.end= MPC85xx_IRQ_IIC1,.flags= IORESOURCE_IRQ,},},},[MPC85xx_DMA0] = {.name = "fsl-dma",.id= 0,.num_resources = 2,.resource = (struct resource[]) {{.start= MPC85xx_DMA0_OFFSET,.end= MPC85xx_DMA0_OFFSET +MPC85xx_DMA0_SIZE - 1,.flags= IORESOURCE_MEM,},{.start= MPC85xx_IRQ_DMA0,.end= MPC85xx_IRQ_DMA0,.flags= IORESOURCE_IRQ,},},},[MPC85xx_DMA1] = {.name = "fsl-dma",.id= 1,.num_resources = 2,.resource = (struct resource[]) {{.start= MPC85xx_DMA1_OFFSET,.end= MPC85xx_DMA1_OFFSET +MPC85xx_DMA1_SIZE - 1,.flags= IORESOURCE_MEM,},{.start= MPC85xx_IRQ_DMA1,.end= MPC85xx_IRQ_DMA1,.flags= IORESOURCE_IRQ,},},},[MPC85xx_DMA2] = {.name = "fsl-dma",.id= 2,.num_resources = 2,.resource = (struct resource[]) {{.start= MPC85xx_DMA2_OFFSET,.end= MPC85xx_DMA2_OFFSET +MPC85xx_DMA2_SIZE - 1,.flags= IORESOURCE_MEM,},{.start= MPC85xx_IRQ_DMA2,.end= MPC85xx_IRQ_DMA2,.flags= IORESOURCE_IRQ,},},},[MPC85xx_DMA3] = {.name = "fsl-dma",.id= 3,.num_resources = 2,.resource = (struct resource[]) {{.start= MPC85xx_DMA3_OFFSET,.end= MPC85xx_DMA3_OFFSET +MPC85xx_DMA3_SIZE - 1,.flags= IORESOURCE_MEM,},{.start= MPC85xx_IRQ_DMA3,.end= MPC85xx_IRQ_DMA3,.flags= IORESOURCE_IRQ,},},},[MPC85xx_DUART] = {.name = "serial8250",.id= PLAT8250_DEV_PLATFORM,.dev.platform_data = serial_platform_data,},[MPC85xx_PERFMON] = {.name = "fsl-perfmon",.id= 1,.num_resources = 2,.resource = (struct resource[]) {{.start= MPC85xx_PERFMON_OFFSET,.end= MPC85xx_PERFMON_OFFSET +MPC85xx_PERFMON_SIZE - 1,.flags= IORESOURCE_MEM,},{.start= MPC85xx_IRQ_PERFMON,.end= MPC85xx_IRQ_PERFMON,.flags= IORESOURCE_IRQ,},},},[MPC85xx_SEC2] = {.name = "fsl-sec2",.id= 1,.num_resources = 2,.resource = (struct resource[]) {{.start= MPC85xx_SEC2_OFFSET,.end= MPC85xx_SEC2_OFFSET +MPC85xx_SEC2_SIZE - 1,.flags= IORESOURCE_MEM,},{.start= MPC85xx_IRQ_SEC2,.end= MPC85xx_IRQ_SEC2,.flags= IORESOURCE_IRQ,},},},[MPC85xx_CPM_FCC1] = {.name = "fsl-cpm-fcc",.id= 1,.num_resources = 4,.dev.platform_data = &mpc85xx_fcc1_pdata,.resource = (struct resource[]) {{.name= "fcc_regs",.start= 0x91300,.end= 0x9131F,.flags= IORESOURCE_MEM,},{.name = "fcc_regs_c",.start= 0x91380,.end= 0x9139F,.flags= IORESOURCE_MEM,},{.name= "fcc_pram",.start= 0x88400,.end= 0x884ff,.flags= IORESOURCE_MEM,},{.start= SIU_INT_FCC1,.end= SIU_INT_FCC1,.flags= IORESOURCE_IRQ,},},},[MPC85xx_CPM_FCC2] = {.name = "fsl-cpm-fcc",.id= 2,.num_resources = 4,.dev.platform_data = &mpc85xx_fcc2_pdata,.resource = (struct resource[]) {{.name= "fcc_regs",.start= 0x91320,.end= 0x9133F,.flags= IORESOURCE_MEM,},{.name = "fcc_regs_c",.start= 0x913A0,.end= 0x913CF,.flags= IORESOURCE_MEM,},{.name= "fcc_pram",.start= 0x88500,.end= 0x885ff,.flags= IORESOURCE_MEM,},{.start= SIU_INT_FCC2,.end= SIU_INT_FCC2,.flags= IORESOURCE_IRQ,},},},[MPC85xx_CPM_FCC3] = {.name = "fsl-cpm-fcc",.id= 3,.num_resources = 4,.dev.platform_data = &mpc85xx_fcc3_pdata,.resource = (struct resource[]) {{.name= "fcc_regs",.start= 0x91340,.end= 0x9135F,.flags= IORESOURCE_MEM,},{.name = "fcc_regs_c",.start= 0x913D0,.end= 0x913FF,.flags= IORESOURCE_MEM,},{.name= "fcc_pram",.start= 0x88600,.end= 0x886ff,.flags= IORESOURCE_MEM,},{.start= SIU_INT_FCC3,.end= SIU_INT_FCC3,.flags= IORESOURCE_IRQ,},},},[MPC85xx_CPM_I2C] = {.name = "fsl-cpm-i2c",.id= 1,.num_resources = 2,.resource = (struct resource[]) {{.start= 0x91860,.end= 0x918BF,.flags= IORESOURCE_MEM,},{.start= SIU_INT_I2C,.end= SIU_INT_I2C,.flags= IORESOURCE_IRQ,},},},[MPC85xx_CPM_SCC1] = {.name = "fsl-cpm-scc",.id= 1,.num_resources = 2,.resource = (struct resource[]) {{.start= 0x91A00,.end= 0x91A1F,.flags= IORESOURCE_MEM,},{.start= SIU_INT_SCC1,.end= SIU_INT_SCC1,.flags= IORESOURCE_IRQ,},},},[MPC85xx_CPM_SCC2] = {.name = "fsl-cpm-scc",.id= 2,.num_resources = 2,.resource = (struct resource[]) {{.start= 0x91A20,.end= 0x91A3F,.flags= IORESOURCE_MEM,},{.start= SIU_INT_SCC2,.end= SIU_INT_SCC2,.flags= IORESOURCE_IRQ,},},},[MPC85xx_CPM_SCC3] = {.name = "fsl-cpm-scc",.id= 3,.num_resources = 2,.resource = (struct resource[]) {{.start= 0x91A40,.end= 0x91A5F,.flags= IORESOURCE_MEM,},{.start= SIU_INT_SCC3,.end= SIU_INT_SCC3,.flags= IORESOURCE_IRQ,},},},[MPC85xx_CPM_SCC4] = {.name = "fsl-cpm-scc",.id= 4,.num_resources = 2,.resource = (struct resource[]) {{.start= 0x91A60,.end= 0x91A7F,.flags= IORESOURCE_MEM,},{.start= SIU_INT_SCC4,.end= SIU_INT_SCC4,.flags= IORESOURCE_IRQ,},},},[MPC85xx_CPM_SPI] = {.name = "fsl-cpm-spi",.id= 1,.num_resources = 2,.resource = (struct resource[]) {{.start= 0x91AA0,.end= 0x91AFF,.flags= IORESOURCE_MEM,},{.start= SIU_INT_SPI,.end= SIU_INT_SPI,.flags= IORESOURCE_IRQ,},},},[MPC85xx_CPM_MCC1] = {.name = "fsl-cpm-mcc",.id= 1,.num_resources = 2,.resource = (struct resource[]) {{.start= 0x91B30,.end= 0x91B3F,.flags= IORESOURCE_MEM,},{.start= SIU_INT_MCC1,.end= SIU_INT_MCC1,.flags= IORESOURCE_IRQ,},},},[MPC85xx_CPM_MCC2] = {.name = "fsl-cpm-mcc",.id= 2,.num_resources = 2,.resource = (struct resource[]) {{.start= 0x91B50,.end= 0x91B5F,.flags= IORESOURCE_MEM,},{.start= SIU_INT_MCC2,.end= SIU_INT_MCC2,.flags= IORESOURCE_IRQ,},},},[MPC85xx_CPM_SMC1] = {.name = "fsl-cpm-smc",.id= 1,.num_resources = 2,.resource = (struct resource[]) {{.start= 0x91A80,.end= 0x91A8F,.flags= IORESOURCE_MEM,},{.start= SIU_INT_SMC1,.end= SIU_INT_SMC1,.flags= IORESOURCE_IRQ,},},},[MPC85xx_CPM_SMC2] = {.name = "fsl-cpm-smc",.id= 2,.num_resources = 2,.resource = (struct resource[]) {{.start= 0x91A90,.end= 0x91A9F,.flags= IORESOURCE_MEM,},{.start= SIU_INT_SMC2,.end= SIU_INT_SMC2,.flags= IORESOURCE_IRQ,},},},[MPC85xx_CPM_USB] = {.name = "fsl-cpm-usb",.id= 2,.num_resources = 2,.resource = (struct resource[]) {{.start= 0x91B60,.end= 0x91B7F,.flags= IORESOURCE_MEM,},{.start= SIU_INT_USB,.end= SIU_INT_USB,.flags= IORESOURCE_IRQ,},},},[MPC85xx_eTSEC1] = {.name = "fsl-gianfar",.id= 1,.dev.platform_data = &mpc85xx_etsec1_pdata,.num_resources = 4,.resource = (struct resource[]) {{.start= MPC85xx_ENET1_OFFSET,.end= MPC85xx_ENET1_OFFSET +MPC85xx_ENET1_SIZE - 1,.flags= IORESOURCE_MEM,},{.name= "tx",.start= MPC85xx_IRQ_TSEC1_TX,.end= MPC85xx_IRQ_TSEC1_TX,.flags= IORESOURCE_IRQ,},{.name= "rx",.start= MPC85xx_IRQ_TSEC1_RX,.end= MPC85xx_IRQ_TSEC1_RX,.flags= IORESOURCE_IRQ,},{.name= "error",.start= MPC85xx_IRQ_TSEC1_ERROR,.end= MPC85xx_IRQ_TSEC1_ERROR,.flags= IORESOURCE_IRQ,},},},[MPC85xx_eTSEC2] = {.name = "fsl-gianfar",.id= 2,.dev.platform_data = &mpc85xx_etsec2_pdata,.num_resources = 4,.resource = (struct resource[]) {{.start= MPC85xx_ENET2_OFFSET,.end= MPC85xx_ENET2_OFFSET +MPC85xx_ENET2_SIZE - 1,.flags= IORESOURCE_MEM,},{.name= "tx",.start= MPC85xx_IRQ_TSEC2_TX,.end= MPC85xx_IRQ_TSEC2_TX,.flags= IORESOURCE_IRQ,},{.name= "rx",.start= MPC85xx_IRQ_TSEC2_RX,.end= MPC85xx_IRQ_TSEC2_RX,.flags= IORESOURCE_IRQ,},{.name= "error",.start= MPC85xx_IRQ_TSEC2_ERROR,.end= MPC85xx_IRQ_TSEC2_ERROR,.flags= IORESOURCE_IRQ,},},},[MPC85xx_eTSEC3] = {.name = "fsl-gianfar",.id= 3,.dev.platform_data = &mpc85xx_etsec3_pdata,.num_resources = 4,.resource = (struct resource[]) {{.start= MPC85xx_ENET3_OFFSET,.end= MPC85xx_ENET3_OFFSET +MPC85xx_ENET3_SIZE - 1,.flags= IORESOURCE_MEM,},{.name= "tx",.start= MPC85xx_IRQ_TSEC3_TX,.end= MPC85xx_IRQ_TSEC3_TX,.flags= IORESOURCE_IRQ,},{.name= "rx",.start= MPC85xx_IRQ_TSEC3_RX,.end= MPC85xx_IRQ_TSEC3_RX,.flags= IORESOURCE_IRQ,},{.name= "error",.start= MPC85xx_IRQ_TSEC3_ERROR,.end= MPC85xx_IRQ_TSEC3_ERROR,.flags= IORESOURCE_IRQ,},},},[MPC85xx_eTSEC4] = {.name = "fsl-gianfar",.id= 4,.dev.platform_data = &mpc85xx_etsec4_pdata,.num_resources = 4,.resource = (struct resource[]) {{.start= 0x27000,.end= 0x27fff,.flags= IORESOURCE_MEM,},{.name= "tx",.start= MPC85xx_IRQ_TSEC4_TX,.end= MPC85xx_IRQ_TSEC4_TX,.flags= IORESOURCE_IRQ,},{.name= "rx",.start= MPC85xx_IRQ_TSEC4_RX,.end= MPC85xx_IRQ_TSEC4_RX,.flags= IORESOURCE_IRQ,},{.name= "error",.start= MPC85xx_IRQ_TSEC4_ERROR,.end= MPC85xx_IRQ_TSEC4_ERROR,.flags= IORESOURCE_IRQ,},},},[MPC85xx_IIC2] = {.name = "fsl-i2c",.id= 2,.dev.platform_data = &mpc85xx_fsl_i2c2_pdata,.num_resources = 2,.resource = (struct resource[]) {{.start= 0x03100,.end= 0x031ff,.flags= IORESOURCE_MEM,},{.start= MPC85xx_IRQ_IIC1,.end= MPC85xx_IRQ_IIC1,.flags= IORESOURCE_IRQ,},},},[MPC85xx_MDIO] = {.name = "fsl-gianfar_mdio",.id = 0,.dev.platform_data = &mpc85xx_mdio_pdata,.num_resources = 1,.resource = (struct resource[]) {{.start= 0x24520,.end= 0x2453f,.flags= IORESOURCE_MEM,},},},};static int __init mach_mpc85xx_fixup(struct platform_device *pdev){ppc_sys_fixup_mem_resource(pdev, CCSRBAR);return 0;}static int __init mach_mpc85xx_init(void){ppc_sys_device_fixup = mach_mpc85xx_fixup;return 0;}postcore_initcall(mach_mpc85xx_init);

 

比较多啊，其实还没列完，前面还省略了一部分内容，比如串口部分。

虽然很长，其实内容都一样哈，这些板上资源被定义为平台设备，注意最后

ppc_sys_device_fixup = mach_mpc85xx_fixup;
这里ppc_sys_device_fixup 在内核中是一个全局的函数指针，大家或许已经注意到了，在ppc系列可能有很多处理器类型，这里指向了

MPC85XX系列是因为我们选择了该类型处理器。如果是在其他型号板子资源文件中肯定指向其他了。

 

好，接着看这么多的设备是怎么注册的呢，要看另一个文件

arch/ppc/syslib/ppc_sys.c

 

我只需要看该文件的最后部分

302 static int __init ppc_sys_init(void)303 {304 unsigned int i, dev_id, ret = 0;305 306 BUG_ON(cur_ppc_sys_spec == NULL);307 308 for (i = 0; i < cur_ppc_sys_spec->num_devices; i++) {309 dev_id = cur_ppc_sys_spec->device_list[i];310 if ((dev_id != -1) &&311 !(cur_ppc_sys_spec->config[dev_id] & PPC_SYS_CONFIG_DISABLED)) {312 if (ppc_sys_device_fixup != NULL)313 ppc_sys_device_fixup(&ppc_sys_platform_devices314 [dev_id]);315 if (platform_device_register316 (&ppc_sys_platform_devices[dev_id])) {//这里就是我们的板子上的device了317 ret = 1;318 printk(KERN_ERR319 "unable to register device %d/n",320 dev_id);321 }322 }323 }324 325 ppc_sys_inited = 1;326 return ret;327 }328 329 subsys_initcall(ppc_sys_init);

 

然后在内核起来的时候进行注册各设备。

device向内核注册了，那么与device相关的driver什么时候注册的，driver代码在哪呢？

这些driver代码分散在drivers目录下各目录中，比如dma controller相关的driver在 drivers/dma下，

i2c controller相关的driver在drivers/i2c下。

这里以i2c controller作为例子。

各i2c controller驱动在drivers/i2c/busses/目录下，而各i2c device驱动在drivers/i2c/chips/目录下

我们要查看的i2c controller驱动文件为

drivers/i2c/busses/i2c-mpc.c

 

驱动内容很简单，就不贴出来了。主要就是一个平台设备的驱动，实现了i2c的读写，i2c device的探测，remove等功能。

然后向内核去注册这个驱动。

驱动怎么匹配设备的？

这个我就不关心了，由总线的方法去匹配。这里platform总线匹配方法很简单的。根据struct platform_device 和

struct platform_driver里面的.name域，看名字是否相同进行匹配。

 

写这篇文章主要是为了理清板级设备如何注册。这跟我们平常做设备驱动方法有点不同，我们平常做一个设备驱动，通常把注册设备和注册驱动放在一起。内核则不同，其实都一样的啦，有设备驱动模型在，总能匹配的。