OMAP3/4 clock: split into per-chip family files

clock34xx_data.c now contains data for the OMAP34xx family, the
OMAP36xx family, and the OMAP3517 family, so rename it to
clock3xxx_data.c.  Rename clock34xx.c to clock3xxx.c, and move the
chip family-specific clock functions to clock34xx.c, clock36xx.c, or
clock3517.c, as appropriate.  So now "clock3xxx.*" refers to the OMAP3
superset.

The main goal here is to prepare to compile chip family-specific clock
functions only for kernel builds that target that chip family.  To get to
that point, we also need to add CONFIG_SOC_* options for those other
chip families; that will be done in future patches, planned for 2.6.35.

OMAP4 is also affected by this.  It duplicated the OMAP3 non-CORE DPLL
clkops structure.  The OMAP4 variant of this clkops structure has been
removed, and since there was nothing else currently in clock44xx.c, it
too has been removed -- it can always be added back later when there
is some content for it.  (The OMAP4 clock autogeneration scripts have been
updated accordingly.)

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Benoît Cousson <b-cousson@ti.com>
Cc: Rajendra Nayak <rnayak@ti.com>
Cc: Ranjith Lohithakshan <ranjithl@ti.com>
Cc: Tony Lindgren <tony@atomide.com>

1 files changed, 124 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/clock3517.c b/arch/arm/mach-omap2/clock3517.c
new file mode 100644
index 000000000000..b496a9305e1c
--- /dev/null
+++ b/arch/arm/mach-omap2/clock3517.c
@@ -0,0 +1,124 @@
+/*
+ * OMAP3517/3505-specific clock framework functions
+ *
+ * Copyright (C) 2010 Texas Instruments, Inc.
+ * Copyright (C) 2010 Nokia Corporation
+ *
+ * Ranjith Lohithakshan
+ * Paul Walmsley
+ *
+ * Parts of this code are based on code written by
+ * Richard Woodruff, Tony Lindgren, Tuukka Tikkanen, Karthik Dasu,
+ * Russell King
+ *
+ * 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 "clock.h"
+#include "clock3517.h"
+#include "cm.h"
+#include "cm-regbits-34xx.h"
+
+/*
+ * 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
+
+/**
+ * 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,
+};
+
+