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ARM: zynq: Add MIO detection code

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Add run-time MIO pin detection to get actual
pin configuration for specific periphery.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
Michal Simek 2014-04-25 12:21:04 +02:00 committed by Michal Simek
parent 3d456eec43
commit 3cc3fa8672
2 changed files with 51 additions and 0 deletions
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50
arch/arm/cpu/armv7/zynq/slcr.c
View File

@ -17,6 +17,26 @@
#define SLCR_IDCODE_MASK 0x1F000
#define SLCR_IDCODE_SHIFT 12
/*
* zynq_slcr_mio_get_status - Get the status of MIO peripheral.
*
* @peri_name: Name of the peripheral for checking MIO status
* @get_pins: Pointer to array of get pin for this peripheral
* @num_pins: Number of pins for this peripheral
* @mask: Mask value
* @check_val: Required check value to get the status of periph
*/
struct zynq_slcr_mio_get_status {
const char *peri_name;
const int *get_pins;
int num_pins;
u32 mask;
u32 check_val;
};
static const struct zynq_slcr_mio_get_status mio_periphs[] = {
};
static int slcr_lock = 1; /* 1 means locked, 0 means unlocked */
void zynq_slcr_lock(void)
@ -120,3 +140,33 @@ u32 zynq_slcr_get_idcode(void)
return (readl(&slcr_base->pss_idcode) & SLCR_IDCODE_MASK) >>
SLCR_IDCODE_SHIFT;
}
/*
* zynq_slcr_get_mio_pin_status - Get the MIO pin status of peripheral.
*
* @periph: Name of the peripheral
*
* Returns count to indicate the number of pins configured for the
* given @periph.
*/
int zynq_slcr_get_mio_pin_status(const char *periph)
{
const struct zynq_slcr_mio_get_status *mio_ptr;
int val, i, j;
int mio = 0;
for (i = 0; i < ARRAY_SIZE(mio_periphs); i++) {
if (strcmp(periph, mio_periphs[i].peri_name) == 0) {
mio_ptr = &mio_periphs[i];
for (j = 0; j < mio_ptr->num_pins; j++) {
val = readl(&slcr_base->mio_pin
[mio_ptr->get_pins[j]]);
if ((val & mio_ptr->mask) == mio_ptr->check_val)
mio++;
}
break;
}
}
return mio;
}

1
arch/arm/include/asm/arch-zynq/sys_proto.h
View File

@ -15,6 +15,7 @@ extern void zynq_slcr_devcfg_disable(void);
extern void zynq_slcr_devcfg_enable(void);
extern u32 zynq_slcr_get_boot_mode(void);
extern u32 zynq_slcr_get_idcode(void);
extern int zynq_slcr_get_mio_pin_status(const char *periph);
extern void zynq_ddrc_init(void);
extern unsigned int zynq_get_silicon_version(void);