On Apr 17, 2009, at 4:21 PM, Eddie Dawydiuk wrote:
Hello,
In the past I've worked with ARM architectures where I could setup
virtual / physical address mappings so I don't have to ioremap then
pass around pointers. Does PowerPC have an equivalent abstraction?
If not whats the recommended approach?
That is, is there a better approach to the following...
volatile static unsigned char *my_reg = NULL;
static inline void read_func() {
if (!my_reg)
my_reg = (unsigned char *)
ioremap(REG_PHYS_BASE, REG_SIZE);
//do something with the reg
}
static inline void write_func() {
if (!my_reg)
my_reg = (unsigned char *)
ioremap(REG_PHYS_BASE, REG_SIZE);
//do something with the reg
}
Yes have a struct that keeps track of the virt addr and do the mapping
once at init time. This is what most drivers do.
- k
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