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From: Paul Walmsley <paul@pwsan.com>
To: linux-omap-open-source@linux.omap.com
Subject: [PATCH 24/27] omap2 clock: replace omap2_get_crystal_rate() with clock-specific recalc code
Date: Mon, 27 Aug 2007 02:39:20 -0600	[thread overview]
Message-ID: <20070827084124.458092052@pwsan.com> (raw)
In-Reply-To: 20070827083856.549249288@pwsan.com

[-- Attachment #1: use_custom_osc_sys_recalc.patch --]
[-- Type: text/plain, Size: 4094 bytes --]

The OMAP2 clock framework currently uses a nonstandard function to
assign the osc_ck and sys_ck rates, omap2_get_crystal_rate().  By
using custom recalc code for these clocks, we can get rid of it and
rely on the existing clock tree recalculation process.

Signed-off-by: Paul Walmsley <paul@pwsan.com>

---
 arch/arm/mach-omap2/clock.c |   44 ++++++++++++++++++++++++--------------------
 arch/arm/mach-omap2/clock.h |   10 +++++-----
 2 files changed, 29 insertions(+), 25 deletions(-)

Index: linux-omap/arch/arm/mach-omap2/clock.c
===================================================================
--- linux-omap.orig/arch/arm/mach-omap2/clock.c	2007-08-27 02:20:19.000000000 -0600
+++ linux-omap/arch/arm/mach-omap2/clock.c	2007-08-27 02:20:21.000000000 -0600
@@ -113,21 +113,6 @@
 	return;
 }
 
-/* Recalculate SYST_CLK */
-static void omap2_sys_clk_recalc(struct clk * clk)
-{
-	u32 div;
-
-	if (!cpu_is_omap34xx()) {
-		div = prm_read_reg(OMAP24XX_PRCM_CLKSRC_CTRL);
-		/* Test if ext clk divided by 1 or 2 */
-		div &= OMAP_SYSCLKDIV_MASK;
-		div >>= OMAP_SYSCLKDIV_SHIFT;
-		clk->rate = (clk->parent->rate / div);
-	}
-	propagate_rate(clk);
-}
-
 static u32 omap2_get_dpll_rate(struct clk * tclk)
 {
 	long long dpll_clk;
@@ -1045,9 +1030,9 @@
 	.clk_disable_unused	= omap2_clk_disable_unused,
 };
 
-static void __init omap2_get_crystal_rate(struct clk *osc, struct clk *sys)
+static u32 omap2_get_apll_clkin(void)
 {
-	u32 div, aplls, sclk = 13000000;
+	u32 aplls, sclk = 0;
 
 	aplls = cm_read_mod_reg(PLL_MOD, CM_CLKSEL1);
 	aplls &= OMAP24XX_APLLS_CLKIN_MASK;
@@ -1060,12 +1045,30 @@
 	else if (aplls == APLLS_CLKIN_12MHZ)
 		sclk = 12000000;
 
+	return sclk;
+}
+
+static u32 omap2_get_sysclkdiv(void)
+{
+	u32 div;
+
 	div = prm_read_reg(OMAP24XX_PRCM_CLKSRC_CTRL);
 	div &= OMAP_SYSCLKDIV_MASK;
 	div >>= OMAP_SYSCLKDIV_SHIFT;
 
-	osc->rate = sclk * div;
-	sys->rate = sclk;
+	return div;
+}
+
+static void omap2_osc_clk_recalc(struct clk *clk)
+{
+	clk->rate = omap2_get_apll_clkin() * omap2_get_sysclkdiv();
+	propagate_rate(clk);
+}
+
+static void omap2_sys_clk_recalc(struct clk *clk)
+{
+	clk->rate = clk->parent->rate / omap2_get_sysclkdiv();
+	propagate_rate(clk);
 }
 
 /*
@@ -1117,7 +1120,8 @@
 		cpu_mask = RATE_IN_243X;
 
 	clk_init(&omap2_clk_functions);
-	omap2_get_crystal_rate(&osc_ck, &sys_ck);
+
+	omap2_osc_clk_recalc(&osc_ck);
 
 	for (clkp = onchip_clks; clkp < onchip_clks + ARRAY_SIZE(onchip_clks);
 	     clkp++) {
Index: linux-omap/arch/arm/mach-omap2/clock.h
===================================================================
--- linux-omap.orig/arch/arm/mach-omap2/clock.h	2007-08-27 02:20:19.000000000 -0600
+++ linux-omap/arch/arm/mach-omap2/clock.h	2007-08-27 02:20:21.000000000 -0600
@@ -36,6 +36,8 @@
 static u32 omap2_clksel_get_divisor(struct clk *clk);
 static u32 omap2_clksel_to_divisor(struct clk *clk, u32 field_val);
 static u32 omap2_divisor_to_clksel(struct clk *clk, u32 div);
+static void omap2_osc_clk_recalc(struct clk *clk);
+static void omap2_sys_clk_recalc(struct clk *clk);
 static void omap2_dpll_recalc(struct clk *clk);
 static void omap2_fixed_divisor_recalc(struct clk *clk);
 static int omap2_clk_fixed_enable(struct clk *clk);
@@ -598,21 +600,19 @@
 /* Typical 12/13MHz in standalone mode, will be 26Mhz in chassis mode */
 static struct clk osc_ck = {		/* (*12, *13, 19.2, *26, 38.4)MHz */
 	.name		= "osc_ck",
-	.rate		= 26000000,		/* fixed up in clock init */
 	.flags		= CLOCK_IN_OMAP242X | CLOCK_IN_OMAP243X |
-				RATE_FIXED | RATE_PROPAGATES,
+				RATE_PROPAGATES,
 	.enable		= &omap2_enable_osc_ck,
 	.disable	= &omap2_disable_osc_ck,
-	.recalc		= &propagate_rate,
+	.recalc		= &omap2_osc_clk_recalc,
 };
 
 /* With out modem likely 12MHz, with modem likely 13MHz */
 static struct clk sys_ck = {		/* (*12, *13, 19.2, 26, 38.4)MHz */
 	.name		= "sys_ck",		/* ~ ref_clk also */
 	.parent		= &osc_ck,
-	.rate		= 13000000,
 	.flags		= CLOCK_IN_OMAP242X | CLOCK_IN_OMAP243X |
-				RATE_FIXED | ALWAYS_ENABLED | RATE_PROPAGATES,
+				ALWAYS_ENABLED | RATE_PROPAGATES,
 	.recalc		= &omap2_sys_clk_recalc,
 };
 

-- 

  parent reply	other threads:[~2007-08-27  8:39 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-08-27  8:38 [PATCH 00/27] omap2 clock: resend: framework generalization, cleanup Paul Walmsley
2007-08-27  8:38 ` [PATCH 01/27] omap2 clock: dsp_ick parent is dsp_fck, not core_ck Paul Walmsley
2007-08-27  8:38 ` [PATCH 02/27] omap2 clock: generalize initial clock rate setup: recalculate_root_clocks() Paul Walmsley
2007-08-27  8:38 ` [PATCH 03/27] omap2 clock: mark onchip_clksas __initdata Paul Walmsley
2007-08-27  8:39 ` [PATCH 04/27] omap2 clock: remove superfluous omap2_propagate_rate() Paul Walmsley
2007-08-27  8:39 ` [PATCH 05/27] omap2 clock: rename, add comment to omap2_mpu_recalc() Paul Walmsley
2007-08-27  8:39 ` [PATCH 06/27] omap2 clock: add clksel and clksel_rate data Paul Walmsley
2007-08-27  8:39 ` [PATCH 07/27] omap2 clock: init clksel clock parents to hardware reality at clock init Paul Walmsley
2007-08-27  8:39 ` [PATCH 08/27] omap2 clock: convert omap2_clksel_to_divisor and omap2_divisor_to_clksel to use new clksel struct Paul Walmsley
2007-08-27  8:39 ` [PATCH 09/27] omap2 clock: convert omap2_clksel_round_rate " Paul Walmsley
2007-08-27  8:39 ` [PATCH 10/27] omap2 clock: convert omap2_get_clksel " Paul Walmsley
2007-08-27  8:39 ` [PATCH 11/27] omap2 clock: convert omap2_clksel_get_src_field() " Paul Walmsley
2007-08-27  8:39 ` [PATCH 12/27] omap2 clock: stop using clk->src_offset in omap2_clk_set_rate() Paul Walmsley
2007-08-27  8:39 ` [PATCH 13/27] omap2 clock: stop using clk->src_offset in omap2_clk_set_parent() Paul Walmsley
2007-08-27  8:39 ` [PATCH 14/27] omap2 clock: clean out old code from omap2_clksel_recalc() Paul Walmsley
2007-08-27  8:39 ` [PATCH 15/27] omap2 clock: convert remaining clksel clocks to use omap2_clksel_recalc Paul Walmsley
2007-08-27  8:39 ` [PATCH 16/27] omap2 clock: remove all {src, rate}_offset fields from struct clk Paul Walmsley
2007-08-27  8:39 ` [PATCH 17/27] omap2 clock: use the struct clk round_rate field for clksel rate rounding code Paul Walmsley
2007-08-27  8:39 ` [PATCH 18/27] omap2 clock: separate clksel set_rate code into its own function Paul Walmsley
2007-08-27  8:39 ` [PATCH 19/27] omap2 clock: drop RATE_CKCTL from all OMAP2 clocks Paul Walmsley
2007-08-27  8:39 ` [PATCH 20/27] omap2 clock: remove *_SEL* clock flags Paul Walmsley
2007-08-27  8:39 ` [PATCH 21/27] omap2 clock: call clock-specific enable/disable functions if present Paul Walmsley
2007-08-27  8:39 ` [PATCH 22/27] omap2 clock: use custom osc_ck enable/disable routines Paul Walmsley
2007-08-27  8:39 ` [PATCH 23/27] omap2 clock: use standard clk->enable/disable for APLLs Paul Walmsley
2007-08-27  8:39 ` Paul Walmsley [this message]
2007-08-27  8:39 ` [PATCH 25/27] omap2 clock: Standardize DPLL rate recalculation with struct dpll_data Paul Walmsley
2007-08-27  8:39 ` [PATCH 26/27] omap2 clock: generalize clock enable upon framework initialization Paul Walmsley
2007-08-27  8:39 ` [PATCH 27/27] omap2 clock: add three missing clocks: gpmc_fck, sdma_{i, f}ck Paul Walmsley
2007-08-31 18:24 ` [PATCH 00/27] omap2 clock: resend: framework generalization, cleanup Tony Lindgren

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