| AustinMarton |
01-19-2009 10:36 PM |
Platform_device structure with more than one driver
Hi there, I am working on two drivers for a network device running on uClinux. One is a char driver which controls the configuration registers, and one is a network driver which is responsible for tx/rx of Ethernet frames.
Since the base address and irq configuration could change, we have decided to register them both as a "platform_device".
I have managed to do this successfully with the network driver, but now it comes to doing the same with the character driver I am not sure how to go about it.
Can anyone link me to some sort of outline of the platform device structure? Although it is mentioned a lot I am having difficulty finding any actual definition of how to use it. Does anyone know how this works with two drivers accessing the same resource? Do I need to create two resources with the same address?
Currently my setup.c file looks something like this...
Code:
#if defined(CONFIG_mydriv) && defined(na_mydriv)
#include <linux/mydriv.h>
static struct resource mydriv_resource[] = {
[0] = { /* Address */
.start = na_mydriv + 0, /* 70 */
.end = na_mydriv + 3, /* 73 */
.flags = IORESOURCE_MEM,
},
[1] = { /* Data */
.start = na_mydriv + 4, /* 74 */
.end = na_mydriv + 5, /* 75 */
.flags = IORESOURCE_MEM,
},
[2] = { /* IRQ */
.start = na_mydriv_irq, /* 4 */
.end = na_mydriv_irq, /* 4 */
.flags = IORESOURCE_IRQ | IRQF_TRIGGER_FALLING,
},
[3] = { /* CPU_FRAME_REG */
.start = na_mydriv + 6, /* 76 */
.end = na_mydriv + 7, /* 77 */
.flags = IORESOURCE_MEM,
},
[4] = { /* CMD_STATUS_REG */
.start = na_mydriv + 8, /* 78 */
.end = na_mydriv + 9, /* 79 */
.flags = IORESOURCE_MEM,
},
[5] = { /* INT_REG */
.start = na_mydriv + 10, /* 7A */
.end = na_mydriv + 11, /* 7B */
.flags = IORESOURCE_MEM,
},
[6] = { /* CTL_FRAME_BUF1 */
.start = na_mydriv + 12, /* 7C */
.end = na_mydriv + 13, /* 7D */
.flags = IORESOURCE_MEM,
},
[7] = { /* CTL_FRAME_BUF2 */
.start = na_mydriv + 14, /* 7E */
.end = na_mydriv + 15, /* 7F */
.flags = IORESOURCE_MEM,
}
};
static struct mydriv_plat_data mydriv_platdata = {
.flags = mydriv_PLATF_16BITONLY,
};
static struct platform_device mydriv_device = {
.name = "mydriv",
.id = 0,
.num_resources = ARRAY_SIZE(mydriv_resource),
.resource = mydriv_resource,
.dev = {
.platform_data = &mydriv_platdata,
}
};
static int __init mydriv_device_init(void)
{
/* customizes platform devices, or adds new ones */
platform_device_register(&mydriv_device);
return 0;
}
arch_initcall(mydriv_device_init);
#endif
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