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-rw-r--r--arch/arm/mach-tegra/tegra20/clock.c76
1 files changed, 54 insertions, 22 deletions
diff --git a/arch/arm/mach-tegra/tegra20/clock.c b/arch/arm/mach-tegra/tegra20/clock.c
index d11e89b..ec04cf5 100644
--- a/arch/arm/mach-tegra/tegra20/clock.c
+++ b/arch/arm/mach-tegra/tegra20/clock.c
@@ -413,46 +413,78 @@ u32 *get_periph_source_reg(enum periph_id periph_id)
return &clkrst->crc_clk_src[internal_id];
}
-/**
- * Given a peripheral ID and the required source clock, this returns which
- * value should be programmed into the source mux for that peripheral.
- *
- * There is special code here to handle the one source type with 5 sources.
- *
- * @param periph_id peripheral to start
- * @param source PLL id of required parent clock
- * @param mux_bits Set to number of bits in mux register: 2 or 4
- * @param divider_bits Set to number of divider bits (8 or 16)
- * @return mux value (0-4, or -1 if not found)
- */
-int get_periph_clock_source(enum periph_id periph_id,
- enum clock_id parent, int *mux_bits, int *divider_bits)
+int get_periph_clock_info(enum periph_id periph_id, int *mux_bits,
+ int *divider_bits, int *type)
{
- enum clock_type_id type;
enum periphc_internal_id internal_id;
- int mux;
- assert(clock_periph_id_isvalid(periph_id));
+ if (!clock_periph_id_isvalid(periph_id))
+ return -1;
internal_id = periph_id_to_internal_id[periph_id];
- assert(periphc_internal_id_isvalid(internal_id));
+ if (!periphc_internal_id_isvalid(internal_id))
+ return -1;
- type = clock_periph_type[internal_id];
- assert(clock_type_id_isvalid(type));
+ *type = clock_periph_type[internal_id];
+ if (!clock_type_id_isvalid(*type))
+ return -1;
/*
* Special cases here for the clock with a 4-bit source mux and I2C
* with its 16-bit divisor
*/
- if (type == CLOCK_TYPE_PCXTS)
+ if (*type == CLOCK_TYPE_PCXTS)
*mux_bits = MASK_BITS_31_28;
else
*mux_bits = MASK_BITS_31_30;
- if (type == CLOCK_TYPE_PCMT16)
+ if (*type == CLOCK_TYPE_PCMT16)
*divider_bits = 16;
else
*divider_bits = 8;
+ return 0;
+}
+
+enum clock_id get_periph_clock_id(enum periph_id periph_id, int source)
+{
+ enum periphc_internal_id internal_id;
+ int type;
+
+ if (!clock_periph_id_isvalid(periph_id))
+ return CLOCK_ID_NONE;
+
+ internal_id = periph_id_to_internal_id[periph_id];
+ if (!periphc_internal_id_isvalid(internal_id))
+ return CLOCK_ID_NONE;
+
+ type = clock_periph_type[internal_id];
+ if (!clock_type_id_isvalid(type))
+ return CLOCK_ID_NONE;
+
+ return clock_source[type][source];
+}
+
+/**
+ * Given a peripheral ID and the required source clock, this returns which
+ * value should be programmed into the source mux for that peripheral.
+ *
+ * There is special code here to handle the one source type with 5 sources.
+ *
+ * @param periph_id peripheral to start
+ * @param source PLL id of required parent clock
+ * @param mux_bits Set to number of bits in mux register: 2 or 4
+ * @param divider_bits Set to number of divider bits (8 or 16)
+ * @return mux value (0-4, or -1 if not found)
+ */
+int get_periph_clock_source(enum periph_id periph_id,
+ enum clock_id parent, int *mux_bits, int *divider_bits)
+{
+ enum clock_type_id type;
+ int mux, err;
+
+ err = get_periph_clock_info(periph_id, mux_bits, divider_bits, &type);
+ assert(!err);
+
for (mux = 0; mux < CLOCK_MAX_MUX; mux++)
if (clock_source[type][mux] == parent)
return mux;