AM35xx: Add clock support for new modules on AM35xx

This patch adds clock support for the following AM35xx modules
	- Ethernet MAC
	- CAN Controller (HECC)
	- New MUSB OTG Controller with integrated Phy
	- Video Processing Front End (VPFE)
	- Additional UART (UART4)

Signed-off-by: Ranjith Lohithakshan <ranjithl@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>

1 files changed, 93 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/clock34xx.c b/arch/arm/mach-omap2/clock34xx.c
index 49d93efc1911..0e4fdba7f20b 100644
--- a/arch/arm/mach-omap2/clock34xx.c
+++ b/arch/arm/mach-omap2/clock34xx.c
@@ -39,6 +39,16 @@
  */
 #define DPLL5_FREQ_FOR_USBHOST          120000000
 
+/*
+ * In AM35xx IPSS, the {ICK,FCK} enable bits for modules are exported
+ * in the same register at a bit offset of 0x8. The EN_ACK for ICK is
+ * at an offset of 4 from ICK enable bit.
+ */
+#define AM35XX_IPSS_ICK_MASK                    0xF
+#define AM35XX_IPSS_ICK_EN_ACK_OFFSET   0x4
+#define AM35XX_IPSS_ICK_FCK_OFFSET              0x8
+#define AM35XX_IPSS_CLK_IDLEST_VAL              0
+
 /* needed by omap3_core_dpll_m2_set_rate() */
 struct clk *sdrc_ick_p, *arm_fck_p;
 
@@ -144,6 +154,89 @@ const struct clkops omap3_clkops_noncore_dpll_ops = {
         .disable        = omap3_noncore_dpll_disable,
 };
 
+/**
+ * am35xx_clk_find_idlest - return clock ACK info for AM35XX IPSS
+ * @clk: struct clk * being enabled
+ * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
+ * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
+ * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
+ *
+ * The interface clocks on AM35xx IPSS reflects the clock idle status
+ * in the enable register itsel at a bit offset of 4 from the enable
+ * bit. A value of 1 indicates that clock is enabled.
+ */
+static void am35xx_clk_find_idlest(struct clk *clk,
+                                            void __iomem **idlest_reg,
+                                            u8 *idlest_bit,
+                                            u8 *idlest_val)
+{
+        *idlest_reg = (__force void __iomem *)(clk->enable_reg);
+        *idlest_bit = clk->enable_bit + AM35XX_IPSS_ICK_EN_ACK_OFFSET;
+        *idlest_val = AM35XX_IPSS_CLK_IDLEST_VAL;
+}
+
+/**
+ * am35xx_clk_find_companion - find companion clock to @clk
+ * @clk: struct clk * to find the companion clock of
+ * @other_reg: void __iomem ** to return the companion clock CM_*CLKEN va in
+ * @other_bit: u8 ** to return the companion clock bit shift in
+ *
+ * Some clocks don't have companion clocks.  For example, modules with
+ * only an interface clock (such as HECC) don't have a companion
+ * clock.  Right now, this code relies on the hardware exporting a bit
+ * in the correct companion register that indicates that the
+ * nonexistent 'companion clock' is active.  Future patches will
+ * associate this type of code with per-module data structures to
+ * avoid this issue, and remove the casts.  No return value.
+ */
+static void am35xx_clk_find_companion(struct clk *clk, void __iomem **other_reg,
+                                            u8 *other_bit)
+{
+        *other_reg = (__force void __iomem *)(clk->enable_reg);
+        if (clk->enable_bit & AM35XX_IPSS_ICK_MASK)
+                *other_bit = clk->enable_bit + AM35XX_IPSS_ICK_FCK_OFFSET;
+        else
+                *other_bit = clk->enable_bit - AM35XX_IPSS_ICK_FCK_OFFSET;
+}
+
+const struct clkops clkops_am35xx_ipss_module_wait = {
+        .enable         = omap2_dflt_clk_enable,
+        .disable        = omap2_dflt_clk_disable,
+        .find_idlest    = am35xx_clk_find_idlest,
+        .find_companion = am35xx_clk_find_companion,
+};
+
+/**
+ * am35xx_clk_ipss_find_idlest - return CM_IDLEST info for IPSS
+ * @clk: struct clk * being enabled
+ * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
+ * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
+ * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
+ *
+ * The IPSS target CM_IDLEST bit is at a different shift from the
+ * CM_{I,F}CLKEN bit.  Pass back the correct info via @idlest_reg
+ * and @idlest_bit.  No return value.
+ */
+static void am35xx_clk_ipss_find_idlest(struct clk *clk,
+                                            void __iomem **idlest_reg,
+                                            u8 *idlest_bit,
+                                            u8 *idlest_val)
+{
+        u32 r;
+
+        r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
+        *idlest_reg = (__force void __iomem *)r;
+        *idlest_bit = AM35XX_ST_IPSS_SHIFT;
+        *idlest_val = OMAP34XX_CM_IDLEST_VAL;
+}
+
+const struct clkops clkops_am35xx_ipss_wait = {
+        .enable         = omap2_dflt_clk_enable,
+        .disable        = omap2_dflt_clk_disable,
+        .find_idlest    = am35xx_clk_ipss_find_idlest,
+        .find_companion = omap2_clk_dflt_find_companion,
+};
+
 int omap3_dpll4_set_rate(struct clk *clk, unsigned long rate)
 {
         /*