linux编译mmc驱动 Embeded linux之MMC驱动

一、注册平台设备

platform_device_register(&usr_mci_device);

二、填写平台设备结构体

static struct platform_device usr_mci_device= {

.name = "xxx",

.id = 0,

.dev = {

.release = usr_mci_platdev_release,

.dma_mask = &usr_mmc_dmamask,

.coherent_dma_mask = DMA_BIT_MASK(32),

},

.num_resources = ARRAY_SIZE(usr_mci_resources),

.resource = usr_mci_resources,

};

三、填写资源结构体(物理地址查芯片手册)

static struct resource usr_mci_resources[] = {

[0] = {

.start = CONFIG_USR_IOBASE,

.end = CONFIG_USR_IOBASE + USR_MCI_IO_SIZE - 1,

.flags = IORESOURCE_MEM,

},

[1] = {

.start = CONFIG_USR_INTR,

.end = CONFIG_USR_INTR,

.flags = IORESOURCE_IRQ,

},

};

四、注册平台驱动

platform_driver_register(&usr_mci_driver);

五、填写平台驱动结构体

static struct platform_driver usr_mci_driver= {

.probe = usr_mci_probe,

.remove = usr_mci_remove,

.suspend = usr_mci_suspend,

.resume = usr_mci_resume,

.driver = {

.name = DRIVER_NAME,

},

};

六、重写probe函数

static int __devinit usr_mci_probe(struct platform_device *pdev)

七、创建一个自己的设备结构体

struct usr_host {

struct mmc_host*mmc;

spinlock_tlock;

struct mmc_request*mrq;

struct mmc_command*cmd;

struct mmc_data*data;

void __iomem*base;

unsigned intcard_status;

struct scatterlist*dma_sg;

unsigned intdma_sg_num;

unsigned intdma_alloc_size;

unsigned intdma_dir;

dma_addr_tdma_paddr;

unsigned int*dma_vaddr;

struct timer_listtimer;

unsigned intirq;

unsigned intirq_status;

unsigned intis_tuning;

wait_queue_head_tintr_wait;

unsigned longpending_events;

unsigned intid;

};

struct usr_host*host;

八、分配一个包含了mmc_host的自定义结构体(core需要)

structmmc_host *mmc;

mmc = mmc_alloc_host(sizeof(struct usr_host), &pdev->dev);

九、初始化mmc_host结构体

mmc->ops

mmc->f_min

mmc->f_max

mmc->caps

mmc->max_blk_count

mmc->max_segs

mmc->max_seg_size

mmc->max_req_size

mmc->ocr_avail

mmc->ocr

十、初始化usr_host

host=mmc->private;

host->dma_vaddr =dma_alloc_coherent(&pdev->dev, PAGE_SIZE,&host->dma_paddr, GFP_KERNEL);

host->mmc = mmc;

host->id

host->base

十一、初始化SDIO的时钟、驱动能力

十二、SDIO复位

十三、SDIO重上电

十四、设置时钟相位

十五、设置阈值

十六、设置中断状态

十七、设置中断屏蔽

十八、设置DMA搬移数据

十九、设置全局中断使能

二十、设置FIFO突发长度与FIFO大小

二十一、卡检测

二十二、初始化定时器，定时处理函数为卡检测

二十三、获取资源结构体的软中断号

二十四、初始化等待队列

init_waitqueue_head(&host->intr_wait);

二十五、request_irq注册中断

二十六、写中断函数(唤醒等待队列)

static irqreturn_t usr_irq(int irq, void *dev_id)

{

wake_up(&host->intr_wait);

}

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