[PATCH 03/10] ARM: OMAP: Clock tree updates for OMAP2/3

[Paul Walmsley <paul@pwsan.com>]

Fix some bugs in the OMAP3 clock tree pertaining to the 96MHz clocks.
The 96MHz portion of the clock tree should now have reasonable
fidelity to the 34xx TRM Rev I.  One remaining question mark: it's not
clear exactly which 96MHz source clock the USIM uses.  This patch
sticks with the previous setting.

Add a missing OMAP24xx clock, the SSI L4 interface clock, as
"ssi_l4_ick".

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 arch/arm/mach-omap2/clock24xx.h       |   15 +++++++++
 arch/arm/mach-omap2/clock34xx.h       |   56 +++++++++++++++++++++------------
 arch/arm/mach-omap2/cm-regbits-34xx.h |    8 ++++-
 3 files changed, 57 insertions(+), 22 deletions(-)

diff --git a/arch/arm/mach-omap2/clock24xx.h b/arch/arm/mach-omap2/clock24xx.h
index 242a19d..00ca071 100644
--- a/arch/arm/mach-omap2/clock24xx.h
+++ b/arch/arm/mach-omap2/clock24xx.h
@@ -1290,6 +1290,20 @@ static struct clk ssi_ssr_sst_fck = {
 	.set_rate	= &omap2_clksel_set_rate
 };
 
+/*
+ * Presumably this is the same as SSI_ICLK.
+ * TRM contradicts itself on what clockdomain SSI_ICLK is in
+ */
+static struct clk ssi_l4_ick = {
+	.name		= "ssi_l4_ick",
+	.parent		= &l4_ck,
+	.clkdm_name	= "core_l4_clkdm",
+	.flags		= CLOCK_IN_OMAP242X | CLOCK_IN_OMAP243X,
+	.enable_reg	= OMAP_CM_REGADDR(CORE_MOD, CM_ICLKEN2),
+	.enable_bit	= OMAP24XX_EN_SSI_SHIFT,
+	.recalc		= &followparent_recalc,
+};
+
 
 /*
  * GFX clock domain
@@ -2688,6 +2702,7 @@ static struct clk *onchip_24xx_clks[] __initdata = {
 	&usb_l4_ick,
 	/* L4 domain clocks */
 	&l4_ck,			/* used as both core_l4 and wu_l4 */
+	&ssi_l4_ick,
 	/* virtual meta-group clock */
 	&virt_prcm_set,
 	/* general l4 interface ck, multi-parent functional clk */
diff --git a/arch/arm/mach-omap2/clock34xx.h b/arch/arm/mach-omap2/clock34xx.h
index afa1174..e22749e 100644
--- a/arch/arm/mach-omap2/clock34xx.h
+++ b/arch/arm/mach-omap2/clock34xx.h
@@ -646,6 +646,12 @@ static const struct clksel omap_96m_alwon_fck_clksel[] = {
 	{ .parent = NULL }
 };
 
+/*
+ * DPLL4 generates DPLL4_M2X2_CLK which is then routed into the PRM as
+ * PRM_96M_ALWON_(F)CLK.  Two clocks then emerge from the PRM:
+ * 96M_ALWON_FCLK (called "omap_96m_alwon_fck" below) and
+ * CM_96K_(F)CLK.
+ */
 static struct clk omap_96m_alwon_fck = {
 	.name		= "omap_96m_alwon_fck",
 	.parent		= &dpll4_m2x2_ck,
@@ -654,31 +660,41 @@ static struct clk omap_96m_alwon_fck = {
 	.clksel_mask	= OMAP3430_ST_PERIPH_CLK_MASK,
 	.clksel		= omap_96m_alwon_fck_clksel,
 	.flags		= CLOCK_IN_OMAP343X | RATE_PROPAGATES |
-				 PARENT_CONTROLS_CLOCK,
+				PARENT_CONTROLS_CLOCK,
 	.recalc		= &omap2_clksel_recalc,
 };
 
-static struct clk omap_96m_fck = {
-	.name		= "omap_96m_fck",
+static struct clk cm_96m_fck = {
+	.name		= "cm_96m_fck",
 	.parent		= &omap_96m_alwon_fck,
 	.flags		= CLOCK_IN_OMAP343X | RATE_PROPAGATES |
 				PARENT_CONTROLS_CLOCK,
 	.recalc		= &followparent_recalc,
 };
 
-static const struct clksel cm_96m_fck_clksel[] = {
-	{ .parent = &sys_ck,	    .rates = dpll_bypass_rates },
-	{ .parent = &dpll4_m2x2_ck, .rates = dpll_locked_rates },
+static const struct clksel_rate omap_96m_dpll_rates[] = {
+	{ .div = 1, .val = 0, .flags = RATE_IN_343X | DEFAULT_RATE },
+	{ .div = 0 }
+};
+
+static const struct clksel_rate omap_96m_sys_rates[] = {
+	{ .div = 1, .val = 1, .flags = RATE_IN_343X | DEFAULT_RATE },
+	{ .div = 0 }
+};
+
+static const struct clksel omap_96m_fck_clksel[] = {
+	{ .parent = &cm_96m_fck, .rates = omap_96m_dpll_rates },
+	{ .parent = &sys_ck,	 .rates = omap_96m_sys_rates },
 	{ .parent = NULL }
 };
 
-static struct clk cm_96m_fck = {
-	.name		= "cm_96m_fck",
-	.parent		= &dpll4_m2x2_ck,
+static struct clk omap_96m_fck = {
+	.name		= "omap_96m_fck",
+	.parent		= &sys_ck,
 	.init		= &omap2_init_clksel_parent,
-	.clksel_reg	= OMAP_CM_REGADDR(PLL_MOD, CM_IDLEST),
-	.clksel_mask	= OMAP3430_ST_PERIPH_CLK_MASK,
-	.clksel		= cm_96m_fck_clksel,
+	.clksel_reg	= OMAP_CM_REGADDR(PLL_MOD, CM_CLKSEL1),
+	.clksel_mask	= OMAP3430_SOURCE_96M_MASK,
+	.clksel		= omap_96m_fck_clksel,
 	.flags		= CLOCK_IN_OMAP343X | RATE_PROPAGATES |
 				PARENT_CONTROLS_CLOCK,
 	.recalc		= &omap2_clksel_recalc,
@@ -753,7 +769,7 @@ static struct clk omap_54m_fck = {
 	.recalc		= &omap2_clksel_recalc,
 };
 
-static const struct clksel_rate omap_48m_96md2_rates[] = {
+static const struct clksel_rate omap_48m_cm96m_rates[] = {
 	{ .div = 2, .val = 0, .flags = RATE_IN_343X | DEFAULT_RATE },
 	{ .div = 0 }
 };
@@ -764,7 +780,7 @@ static const struct clksel_rate omap_48m_alt_rates[] = {
 };
 
 static const struct clksel omap_48m_clksel[] = {
-	{ .parent = &cm_96m_fck, .rates = omap_48m_96md2_rates },
+	{ .parent = &cm_96m_fck, .rates = omap_48m_cm96m_rates },
 	{ .parent = &sys_altclk, .rates = omap_48m_alt_rates },
 	{ .parent = NULL }
 };
@@ -961,10 +977,10 @@ static const struct clksel_rate clkout2_src_54m_rates[] = {
 };
 
 static const struct clksel clkout2_src_clksel[] = {
-	{ .parent = &core_ck,		  .rates = clkout2_src_core_rates },
-	{ .parent = &sys_ck,		  .rates = clkout2_src_sys_rates },
-	{ .parent = &omap_96m_alwon_fck,  .rates = clkout2_src_96m_rates },
-	{ .parent = &omap_54m_fck,	  .rates = clkout2_src_54m_rates },
+	{ .parent = &core_ck,		.rates = clkout2_src_core_rates },
+	{ .parent = &sys_ck,		.rates = clkout2_src_sys_rates },
+	{ .parent = &cm_96m_fck,	.rates = clkout2_src_96m_rates },
+	{ .parent = &omap_54m_fck,	.rates = clkout2_src_54m_rates },
 	{ .parent = NULL }
 };
 
@@ -2790,8 +2806,8 @@ static struct clk mcbsp4_ick = {
 };
 
 static const struct clksel mcbsp_234_clksel[] = {
-	{ .parent = &per_96m_fck, .rates = common_mcbsp_96m_rates },
-	{ .parent = &mcbsp_clks,  .rates = common_mcbsp_mcbsp_rates },
+	{ .parent = &core_96m_fck, .rates = common_mcbsp_96m_rates },
+	{ .parent = &mcbsp_clks,   .rates = common_mcbsp_mcbsp_rates },
 	{ .parent = NULL }
 };
 
diff --git a/arch/arm/mach-omap2/cm-regbits-34xx.h b/arch/arm/mach-omap2/cm-regbits-34xx.h
index 219f5c8..a46f93c 100644
--- a/arch/arm/mach-omap2/cm-regbits-34xx.h
+++ b/arch/arm/mach-omap2/cm-regbits-34xx.h
@@ -449,8 +449,12 @@
 #define OMAP3430_CORE_DPLL_MULT_MASK			(0x7ff << 16)
 #define OMAP3430_CORE_DPLL_DIV_SHIFT			8
 #define OMAP3430_CORE_DPLL_DIV_MASK			(0x7f << 8)
-#define OMAP3430_SOURCE_54M				(1 << 5)
-#define OMAP3430_SOURCE_48M				(1 << 3)
+#define OMAP3430_SOURCE_96M_SHIFT			6
+#define OMAP3430_SOURCE_96M_MASK			(1 << 6)
+#define OMAP3430_SOURCE_54M_SHIFT			5
+#define OMAP3430_SOURCE_54M_MASK			(1 << 5)
+#define OMAP3430_SOURCE_48M_SHIFT			3
+#define OMAP3430_SOURCE_48M_MASK			(1 << 3)
 
 /* CM_CLKSEL2_PLL */
 #define OMAP3430_PERIPH_DPLL_MULT_SHIFT			8