OMAP2+: clock: add interface clock type code with autoidle support

Add interface clock type code with autoidle enable/disable support.
The clkops structures created in this file will be used for all
OMAP2/3 interface clocks with autoidle support.  They will enable the
clock framework to control interface clock autoidle directly.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Tested-by: Rajendra Nayak <rnayak@ti.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>

3 files changed, 85 insertions, 3 deletions

diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index ae44645551c2..c5b1be9b7328 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -110,19 +110,21 @@ obj-$(CONFIG_ARCH_OMAP3)		+= clockdomain.o \
 obj-$(CONFIG_ARCH_OMAP4)                += clockdomain.o \
                                            clockdomain44xx.o \
                                            clockdomains44xx_data.o
+
 # Clock framework
 obj-$(CONFIG_ARCH_OMAP2)                += $(clock-common) clock2xxx.o \
                                            clkt2xxx_sys.o \
                                            clkt2xxx_dpllcore.o \
                                            clkt2xxx_virt_prcm_set.o \
                                            clkt2xxx_apll.o clkt2xxx_osc.o \
-                                           clkt2xxx_dpll.o
+                                           clkt2xxx_dpll.o clkt_iclk.o
 obj-$(CONFIG_SOC_OMAP2420)              += clock2420_data.o
 obj-$(CONFIG_SOC_OMAP2430)              += clock2430.o clock2430_data.o
 obj-$(CONFIG_ARCH_OMAP3)                += $(clock-common) clock3xxx.o \
                                            clock34xx.o clkt34xx_dpll3m2.o \
                                            clock3517.o clock36xx.o \
-                                           dpll3xxx.o clock3xxx_data.o
+                                           dpll3xxx.o clock3xxx_data.o \
+                                           clkt_iclk.o
 obj-$(CONFIG_ARCH_OMAP4)                += $(clock-common) clock44xx_data.o \
                                            dpll3xxx.o dpll44xx.o
 
diff --git a/arch/arm/mach-omap2/clkt_iclk.c b/arch/arm/mach-omap2/clkt_iclk.c
new file mode 100644
index 000000000000..dd8a6d3dc011
--- /dev/null
+++ b/arch/arm/mach-omap2/clkt_iclk.c
@@ -0,0 +1,73 @@
+/*
+ * OMAP2/3 interface clock control
+ *
+ * Copyright (C) 2011 Nokia Corporation
+ * Paul Walmsley
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#undef DEBUG
+
+#include <linux/kernel.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#include <plat/clock.h>
+#include <plat/prcm.h>
+
+#include "clock.h"
+#include "clock2xxx.h"
+#include "cm2xxx_3xxx.h"
+#include "cm-regbits-24xx.h"
+
+/* Private functions */
+
+/* XXX */
+void omap2_clkt_iclk_allow_idle(struct clk *clk)
+{
+        u32 v, r;
+
+        r = ((__force u32)clk->enable_reg ^ (CM_AUTOIDLE ^ CM_ICLKEN));
+
+        v = __raw_readl((__force void __iomem *)r);
+        v |= (1 << clk->enable_bit);
+        __raw_writel(v, (__force void __iomem *)r);
+}
+
+/* XXX */
+void omap2_clkt_iclk_deny_idle(struct clk *clk)
+{
+        u32 v, r;
+
+        r = ((__force u32)clk->enable_reg ^ (CM_AUTOIDLE ^ CM_ICLKEN));
+
+        v = __raw_readl((__force void __iomem *)r);
+        v &= ~(1 << clk->enable_bit);
+        __raw_writel(v, (__force void __iomem *)r);
+}
+
+/* Public data */
+
+const struct clkops clkops_omap2_iclk_dflt_wait = {
+        .enable         = omap2_dflt_clk_enable,
+        .disable        = omap2_dflt_clk_disable,
+        .find_companion = omap2_clk_dflt_find_companion,
+        .find_idlest    = omap2_clk_dflt_find_idlest,
+        .allow_idle     = omap2_clkt_iclk_allow_idle,
+        .deny_idle      = omap2_clkt_iclk_deny_idle,
+};
+
+const struct clkops clkops_omap2_iclk_dflt = {
+        .enable         = omap2_dflt_clk_enable,
+        .disable        = omap2_dflt_clk_disable,
+        .allow_idle     = omap2_clkt_iclk_allow_idle,
+        .deny_idle      = omap2_clkt_iclk_deny_idle,
+};
+
+const struct clkops clkops_omap2_iclk_idle_only = {
+        .allow_idle     = omap2_clkt_iclk_allow_idle,
+        .deny_idle      = omap2_clkt_iclk_deny_idle,
+};
+
diff --git a/arch/arm/mach-omap2/clock.h b/arch/arm/mach-omap2/clock.h
index 9972d892a4af..5008f14448ef 100644
--- a/arch/arm/mach-omap2/clock.h
+++ b/arch/arm/mach-omap2/clock.h
@@ -2,7 +2,7 @@
  *  linux/arch/arm/mach-omap2/clock.h
  *
  *  Copyright (C) 2005-2009 Texas Instruments, Inc.
- *  Copyright (C) 2004-2009 Nokia Corporation
+ *  Copyright (C) 2004-2011 Nokia Corporation
  *
  *  Contacts:
  *  Richard Woodruff <r-woodruff2@ti.com>
@@ -86,6 +86,10 @@ long omap2_clksel_round_rate(struct clk *clk, unsigned long target_rate);
 int omap2_clksel_set_rate(struct clk *clk, unsigned long rate);
 int omap2_clksel_set_parent(struct clk *clk, struct clk *new_parent);
 
+/* clkt_iclk.c public functions */
+extern void omap2_clkt_iclk_allow_idle(struct clk *clk);
+extern void omap2_clkt_iclk_deny_idle(struct clk *clk);
+
 u32 omap2_get_dpll_rate(struct clk *clk);
 void omap2_init_dpll_parent(struct clk *clk);
 
@@ -148,6 +152,9 @@ extern void omap2_clk_exit_cpufreq_table(struct cpufreq_frequency_table **table)
 #define omap2_clk_exit_cpufreq_table    0
 #endif
 
+extern const struct clkops clkops_omap2_iclk_dflt_wait;
+extern const struct clkops clkops_omap2_iclk_dflt;
+extern const struct clkops clkops_omap2_iclk_idle_only;
 extern const struct clkops clkops_omap2xxx_dpll_ops;
 extern const struct clkops clkops_omap3_noncore_dpll_ops;
 extern const struct clkops clkops_omap3_core_dpll_ops;