ARM: zynq: Add MIO detection code
Add run-time MIO pin detection to get actual
pin configuration for specific periphery.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/arm/cpu/armv7/zynq/slcr.c b/arch/arm/cpu/armv7/zynq/slcr.c
index 5ba58fa..51894f9 100644
--- a/arch/arm/cpu/armv7/zynq/slcr.c
+++ b/arch/arm/cpu/armv7/zynq/slcr.c
@@ -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 @@
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;
+}
diff --git a/arch/arm/include/asm/arch-zynq/sys_proto.h b/arch/arm/include/asm/arch-zynq/sys_proto.h
index 2445a04..53c30ec 100644
--- a/arch/arm/include/asm/arch-zynq/sys_proto.h
+++ b/arch/arm/include/asm/arch-zynq/sys_proto.h
@@ -15,6 +15,7 @@
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);