minix/kernel/arch/earm/omap_padconf.c
Thomas Cort 2dab6a5384 kernel: i2c padconf workaround
The padconf library runs in user mode, but to actually affect the
padconf register contents, the processor has to be in privileged
mode. A full server based solution will be developed, but for now
just set the pinmux in the kernel at boot.

Change-Id: I170ed54dae64b27cd9bd8807445231598fb8e3e1
2013-07-15 11:11:13 -04:00

62 lines
1.5 KiB
C

/* temporary padconf work-around
*
* pinmux must be configured in privileged mode on the Cortex-A8. This code
* does a simple static configuration of a few pins. It's only here until
* a proper padconf server that does kernel calls can be developed.
*/
#include "kernel/kernel.h"
#include <sys/types.h>
#include <machine/cpu.h>
#include <minix/mmio.h>
#include <assert.h>
#include <io.h>
#include <stdlib.h>
#include <stdio.h>
#include "omap_padconf.h"
u32_t base = PADCONF_REGISTERS_BASE;
static int kernel_padconf_set(u32_t padconf, u32_t mask, u32_t value);
static int
kernel_padconf_set(u32_t padconf, u32_t mask, u32_t value)
{
assert(padconf <= CONTROL_CONF_USB1_DRVVBUS);
set32(base + padconf, mask, value);
return OK;
}
void
omap3_padconf_init(void)
{
#ifdef AM335X
u32_t pinopts, value;
/* Common options for BeagleBone I2C Pins */
pinopts = CONTROL_CONF_SLEWCTRL | CONTROL_CONF_RXACTIVE |
CONTROL_CONF_PUTYPESEL;
/* I2C0 */
value = pinopts | CONTROL_CONF_MUXMODE(0);
kernel_padconf_set(CONTROL_CONF_I2C0_SDA, 0xffffffff, value);
kernel_padconf_set(CONTROL_CONF_I2C0_SCL, 0xffffffff, value);
/* I2C1 */
value = pinopts | CONTROL_CONF_MUXMODE(2);
kernel_padconf_set(CONTROL_CONF_SPI0_CS0, 0xffffffff, value);
kernel_padconf_set(CONTROL_CONF_SPI0_D1, 0xffffffff, value);
/* I2C2 */
value = pinopts | CONTROL_CONF_MUXMODE(3);
kernel_padconf_set(CONTROL_CONF_UART1_CTSN, 0xffffffff, value);
kernel_padconf_set(CONTROL_CONF_UART1_RTSN, 0xffffffff, value);
#endif
/* nothing to do for DM37XX */
return;
}