DM9000驱动的一处差异
快乐虾
http://blog.csdn.net/lights_joy/
本文适用于
ADSP-BF561
优视科技BV561EVB开发板
uclinux-2008r1.5-rc3 / 2010pre
Visual DSP++ 5.0(update 5)
欢迎转载，但请保留作者信息
日前，试了将最新的一版uclinux内核(2010pre)移植到vdsp下，习惯性地从2008r1.5-rc3里面把DM9000的资源定义复制出来：
static struct resource dm9000_bfin_resources[] = {
{
.start = 0x2C000000,
.end = 0x2C000000 + 0x7F,
.flags = IORESOURCE_MEM,
}, {
.start = IRQ_PF44,
.end = IRQ_PF44,
.flags = IORESOURCE_IRQ | IORESOURCE_IRQ_LOWLEVEL,
},
};
static struct platform_device dm9000_bfin_device = {
.name = "dm9000",
.id = -1,
.num_resources = ARRAY_SIZE(dm9000_bfin_resources),
.resource = dm9000_bfin_resources,
};
结果内核运行时提示：
insufficient resources
看一下dm9000的相关代码：
db->addr_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
db->data_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
db->irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (db->addr_res == NULL || db->data_res == NULL ||
db->irq_res == NULL) {
dev_err(db->dev, "insufficient resources/n");
ret = -ENOENT;
goto out;
}
这里需要三个资源定义，而给出的资源只有两个，难怪出错，但是在2008r1.5-rc3版本为什么却可以呢，看下老版本的资源处理：
if (pdev->num_resources < 2) {
ret = -ENODEV;
goto out;
} else if (pdev->num_resources == 2) {
base = pdev->resource[0].start;
if (!request_mem_region(base, 4, ndev->name)) {
ret = -EBUSY;
goto out;
}
ndev->base_addr = base;
ndev->irq = pdev->resource[1].start;
db->io_addr = (void __iomem *)base;
db->io_data = (void __iomem *)(base + 4);
/* ensure at least we have a default set of IO routines */
dm9000_set_io(db, 2);
} else {
db->addr_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
db->data_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
db->irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
………………
}
原来在08r1.5的驱动里面自动判断资源数量，并将第一个内存地址加4后做为io_data的地址！
所以在2010pre版本下的资源定义相应修改为：
static struct resource dm9000_bfin_resources[] = {
{
.start = 0x2C000000,
.end = 0x2C000000 + 0x3,
.flags = IORESOURCE_MEM,
}, {
.start = 0x2C000004,
.end = 0x2C000004 + 0x7F,
.flags = IORESOURCE_MEM,
}, {
.start = IRQ_PF44,
.end = IRQ_PF44,
.flags = IORESOURCE_IRQ | IORESOURCE_IRQ_LOWLEVEL,
},
};
搞定！