clk: pxa: transfer CPU clock setting from pxa2xx-cpufreq

This is the initial stage to transfer the pxa25x and pxa27x CPU clocks
handling from cpufreq to the clock API. More precisely, the clocks
transferred are :
 - cpll : core pll, known also as the CPU core turbo frequency
 - core : core, known also as the CPU actual frequency, being either the
          CPU core turbo frequency or the CPU core run frequency

This transfer is a prequel to shrink the code in pxa2xx-cpufreq.c, so
that it can become, at least in devicetree builds, the casual cpufreq-dt
driver.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

1 files changed, 56 insertions, 1 deletions

diff --git a/drivers/clk/pxa/clk-pxa.h b/drivers/clk/pxa/clk-pxa.h
index d1de805df867..f60a7bccae4e 100644
--- a/drivers/clk/pxa/clk-pxa.h
+++ b/drivers/clk/pxa/clk-pxa.h
@@ -13,6 +13,11 @@
 #ifndef _CLK_PXA_
 #define _CLK_PXA_
 
+#define CLKCFG_TURBO		0x1
+#define CLKCFG_FCS		0x2
+#define CLKCFG_HALFTURBO	0x4
+#define CLKCFG_FASTBUS		0x8
+
 #define PARENTS(name) \
 	static const char *const name ## _parents[] __initconst
 #define MUX_RO_RATE_RO_OPS(name, clk_name)			\
@@ -35,10 +40,27 @@
 			NULL, NULL, CLK_GET_RATE_NOCACHE);	\
 	}
 
-#define RATE_RO_OPS(name, clk_name)			\
+#define RATE_RO_OPS(name, clk_name)				\
+	static struct clk_hw name ## _rate_hw;			\
+	static const struct clk_ops name ## _rate_ops = {		\
+		.recalc_rate = name ## _get_rate,		\
+	};							\
+	static struct clk * __init clk_register_ ## name(void)	\
+	{							\
+		return clk_register_composite(NULL, clk_name,	\
+			name ## _parents,			\
+			ARRAY_SIZE(name ## _parents),		\
+			NULL, NULL,				\
+			&name ## _rate_hw, &name ## _rate_ops,	\
+			NULL, NULL, CLK_GET_RATE_NOCACHE);	\
+	}
+
+#define RATE_OPS(name, clk_name)				\
 	static struct clk_hw name ## _rate_hw;			\
 	static struct clk_ops name ## _rate_ops = {		\
 		.recalc_rate = name ## _get_rate,		\
+		.set_rate = name ## _set_rate,			\
+		.determine_rate = name ## _determine_rate,	\
 	};							\
 	static struct clk * __init clk_register_ ## name(void)	\
 	{							\
@@ -50,6 +72,24 @@
 			NULL, NULL, CLK_GET_RATE_NOCACHE);	\
 	}
 
+#define MUX_OPS(name, clk_name, flags)				\
+	static struct clk_hw name ## _mux_hw;			\
+	static const struct clk_ops name ## _mux_ops = {	\
+		.get_parent = name ## _get_parent,		\
+		.set_parent = name ## _set_parent,		\
+		.determine_rate = name ## _determine_rate,	\
+	};							\
+	static struct clk * __init clk_register_ ## name(void)	\
+	{							\
+		return clk_register_composite(NULL, clk_name,	\
+			name ## _parents,			\
+			ARRAY_SIZE(name ## _parents),		\
+			&name ## _mux_hw, &name ## _mux_ops,	\
+			NULL, NULL,				\
+			NULL, NULL,				\
+			CLK_GET_RATE_NOCACHE | flags); \
+	}
+
 /*
  * CKEN clock type
  * This clock takes it source from 2 possible parents :
@@ -95,6 +135,14 @@ struct desc_clk_cken {
 	PXA_CKEN(dev_id, con_id, name, parents, 1, 1, 1, 1,		\
 		 NULL, cken_reg, cken_bit, flag)
 
+struct pxa2xx_freq {
+	unsigned long cpll;
+	unsigned int membus_khz;
+	unsigned int cccr;
+	unsigned int div2;
+	unsigned int clkcfg;
+};
+
 static int dummy_clk_set_parent(struct clk_hw *hw, u8 index)
 {
 	return 0;
@@ -105,4 +153,11 @@ extern void clkdev_pxa_register(int ckid, const char *con_id,
 extern int clk_pxa_cken_init(const struct desc_clk_cken *clks, int nb_clks);
 void clk_pxa_dt_common_init(struct device_node *np);
 
+void pxa2xx_core_turbo_switch(bool on);
+void pxa2xx_cpll_change(struct pxa2xx_freq *freq,
+			u32 (*mdrefr_dri)(unsigned int), u32 *mdrefr,
+			u32 *cccr);
+int pxa2xx_determine_rate(struct clk_rate_request *req,
+			  struct pxa2xx_freq *freqs,  int nb_freqs);
+
 #endif