I am trying to access the McASP control registers. Reading from the first
one fails with the kernel oops stating "external abort on non-linefetch
(0x1028)". I dont know what that means. A minimum failing example of the
code is below:
#include <linux/module.h>
#include <linux/printk.h>
#include <asm/io.h>
#define MCASP_START 0x48038000
#define MCASP_LENGTH 0x2000
#define PFUNC_REG_OFFSET 0x10
static int start(void)
{
pr_info("Calling for ioremap\n");
void *mcasp = ioremap(MCASP_START, MCASP_LENGTH);
if(mcasp == NULL) {
pr_info("ioremap failed!\n");
return -1;
}
u32 pfunc_reg = ioread32(mcasp + PFUNC_REG_OFFSET); // Kernel Oops here!
pr_info("Success! PFUNC=%08X\n", test);
iounmap(mcasp);
return 0;
}
module_init(start);
I have also tried request_mem_region around it, but that changes nothing.
The sound drivers are not loaded, and the devicetree entry for the McASP is
disabled, so there shouldn't be any problems with conflicts.
Any help is greatly appreciated.
Marc
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