clk: at91: pmc: add helpers for clock drivers
Add helper for clock drivers. These will be used by following
commits in the process of switching AT91 clock drivers to CCF.
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c
index ca90abe..e403bae 100644
--- a/drivers/clk/at91/pmc.c
+++ b/drivers/clk/at91/pmc.c
@@ -120,3 +120,94 @@
return 0;
}
+
+/**
+ * pmc_read() - read content at address base + off into val
+ *
+ * @base: base address
+ * @off: offset to read from
+ * @val: where the content of base + off is stored
+ *
+ * @return: void
+ */
+void pmc_read(void __iomem *base, unsigned int off, unsigned int *val)
+{
+ *val = readl(base + off);
+}
+
+/**
+ * pmc_write() - write content of val at address base + off
+ *
+ * @base: base address
+ * @off: offset to write to
+ * @val: content to be written at base + off
+ *
+ * @return: void
+ */
+void pmc_write(void __iomem *base, unsigned int off, unsigned int val)
+{
+ writel(val, base + off);
+}
+
+/**
+ * pmc_update_bits() - update a set of bits at address base + off
+ *
+ * @base: base address
+ * @off: offset to be updated
+ * @mask: mask of bits to be updated
+ * @bits: the new value to be updated
+ *
+ * @return: void
+ */
+void pmc_update_bits(void __iomem *base, unsigned int off,
+ unsigned int mask, unsigned int bits)
+{
+ unsigned int tmp;
+
+ tmp = readl(base + off);
+ tmp &= ~mask;
+ writel(tmp | (bits & mask), base + off);
+}
+
+/**
+ * at91_clk_mux_val_to_index() - get parent index in mux table
+ *
+ * @table: clock mux table
+ * @num_parents: clock number of parents
+ * @val: clock id who's mux index should be retrieved
+ *
+ * @return: clock index in mux table or a negative error number in case of
+ * failure
+ */
+int at91_clk_mux_val_to_index(const u32 *table, u32 num_parents, u32 val)
+{
+ int i;
+
+ if (!table || !num_parents)
+ return -EINVAL;
+
+ for (i = 0; i < num_parents; i++) {
+ if (table[i] == val)
+ return i;
+ }
+
+ return -EINVAL;
+}
+
+/**
+ * at91_clk_mux_index_to_val() - get parent ID corresponding to an entry in
+ * clock's mux table
+ *
+ * @table: clock's mux table
+ * @num_parents: clock's number of parents
+ * @index: index in mux table which clock's ID should be retrieved
+ *
+ * @return: clock ID or a negative error number in case of failure
+ */
+int at91_clk_mux_index_to_val(const u32 *table, u32 num_parents, u32 index)
+{
+ if (!table || !num_parents || index < 0 || index > num_parents)
+ return -EINVAL;
+
+ return table[index];
+}
diff --git a/drivers/clk/at91/pmc.h b/drivers/clk/at91/pmc.h
index 517ba1d..b1ab0a9 100644
--- a/drivers/clk/at91/pmc.h
+++ b/drivers/clk/at91/pmc.h
@@ -8,6 +8,12 @@
#define __AT91_PMC_H__
#include <regmap.h>
+#include <linux/bitops.h>
+#include <linux/io.h>
+
+/* Keep a range of 256 available clocks for every clock type. */
+#define AT91_TO_CLK_ID(_t, _i) (((_t) << 8) | ((_i) & 0xff))
+#define AT91_CLK_ID_TO_DID(_i) ((_i) & 0xff)
struct pmc_platdata {
struct at91_pmc *reg_base;
@@ -20,4 +26,11 @@
int at91_clk_of_xlate(struct clk *clk, struct ofnode_phandle_args *args);
int at91_clk_probe(struct udevice *dev);
+int at91_clk_mux_val_to_index(const u32 *table, u32 num_parents, u32 val);
+int at91_clk_mux_index_to_val(const u32 *table, u32 num_parents, u32 index);
+
+void pmc_read(void __iomem *base, unsigned int off, unsigned int *val);
+void pmc_write(void __iomem *base, unsigned int off, unsigned int val);
+void pmc_update_bits(void __iomem *base, unsigned int off, unsigned int mask,
+ unsigned int bits);
#endif