[PATCH 2/3 v2] clk: make ICST driver handle the VCO registers
Linus Walleij
linus.walleij at linaro.org
Tue Nov 20 16:54:10 EST 2012
It turns out that all platforms using the ICST VCO are really
just touching two registers, and in the same way as well: one
register with the VCO configuration as such, and one lock register
that makes it possible to write to the VCO.
Factor this register read/write into the ICST driver so we can
reuse it in the IM-PD1 driver.
Signed-off-by: Linus Walleij <linus.walleij at linaro.org>
---
ChangeLog v1->v2:
- Also switch over the RealView (I should pay more attention).
---
drivers/clk/versatile/clk-icst.c | 60 +++++++++++++++++++++++++++++-----
drivers/clk/versatile/clk-icst.h | 14 ++++++--
drivers/clk/versatile/clk-integrator.c | 45 +++----------------------
drivers/clk/versatile/clk-realview.c | 57 ++++++++------------------------
4 files changed, 81 insertions(+), 95 deletions(-)
diff --git a/drivers/clk/versatile/clk-icst.c b/drivers/clk/versatile/clk-icst.c
index 23d2d7e..67ccf4a 100644
--- a/drivers/clk/versatile/clk-icst.c
+++ b/drivers/clk/versatile/clk-icst.c
@@ -17,33 +17,74 @@
#include <linux/clkdev.h>
#include <linux/err.h>
#include <linux/clk-provider.h>
+#include <linux/io.h>
#include "clk-icst.h"
/**
* struct clk_icst - ICST VCO clock wrapper
* @hw: corresponding clock hardware entry
+ * @vcoreg: VCO register address
+ * @lockreg: VCO lock register address
* @params: parameters for this ICST instance
* @rate: current rate
- * @setvco: function to commit ICST settings to hardware
*/
struct clk_icst {
struct clk_hw hw;
+ void __iomem *vcoreg;
+ void __iomem *lockreg;
const struct icst_params *params;
unsigned long rate;
- struct icst_vco (*getvco)(void);
- void (*setvco)(struct icst_vco);
};
#define to_icst(_hw) container_of(_hw, struct clk_icst, hw)
+/**
+ * vco_get() - get ICST VCO settings from a certain register
+ * @vcoreg: register containing the VCO settings
+ */
+static struct icst_vco vco_get(void __iomem *vcoreg)
+{
+ u32 val;
+ struct icst_vco vco;
+
+ val = readl(vcoreg);
+ vco.v = val & 0x1ff;
+ vco.r = (val >> 9) & 0x7f;
+ vco.s = (val >> 16) & 03;
+ return vco;
+}
+
+/**
+ * vco_set() - commit changes to an ICST VCO
+ * @locreg: register to poke to unlock the VCO for writing
+ * @vcoreg: register containing the VCO settings
+ * @vco: ICST VCO parameters to commit
+ */
+static void vco_set(void __iomem *lockreg,
+ void __iomem *vcoreg,
+ struct icst_vco vco)
+{
+ u32 val;
+
+ val = readl(vcoreg) & ~0x7ffff;
+ val |= vco.v | (vco.r << 9) | (vco.s << 16);
+
+ /* This magic unlocks the VCO so it can be controlled */
+ writel(0xa05f, lockreg);
+ writel(val, vcoreg);
+ /* This locks the VCO again */
+ writel(0, lockreg);
+}
+
+
static unsigned long icst_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct clk_icst *icst = to_icst(hw);
struct icst_vco vco;
- vco = icst->getvco();
+ vco = vco_get(icst->vcoreg);
icst->rate = icst_hz(icst->params, vco);
return icst->rate;
}
@@ -66,7 +107,7 @@ static int icst_set_rate(struct clk_hw *hw, unsigned long rate,
vco = icst_hz_to_vco(icst->params, rate);
icst->rate = icst_hz(icst->params, vco);
- icst->setvco(vco);
+ vco_set(icst->vcoreg, icst->lockreg, vco);
return 0;
}
@@ -76,8 +117,9 @@ static const struct clk_ops icst_ops = {
.set_rate = icst_set_rate,
};
-struct clk * __init icst_clk_register(struct device *dev,
- const struct clk_icst_desc *desc)
+struct clk *icst_clk_register(struct device *dev,
+ const struct clk_icst_desc *desc,
+ void __iomem *base)
{
struct clk *clk;
struct clk_icst *icst;
@@ -95,8 +137,8 @@ struct clk * __init icst_clk_register(struct device *dev,
init.num_parents = 0;
icst->hw.init = &init;
icst->params = desc->params;
- icst->getvco = desc->getvco;
- icst->setvco = desc->setvco;
+ icst->vcoreg = base + desc->vco_offset;
+ icst->lockreg = base + desc->lock_offset;
clk = clk_register(dev, &icst->hw);
if (IS_ERR(clk))
diff --git a/drivers/clk/versatile/clk-icst.h b/drivers/clk/versatile/clk-icst.h
index 71b4c56..dad51b6 100644
--- a/drivers/clk/versatile/clk-icst.h
+++ b/drivers/clk/versatile/clk-icst.h
@@ -1,10 +1,18 @@
#include <asm/hardware/icst.h>
+/**
+ * struct clk_icst_desc - descriptor for the ICST VCO
+ * @params: ICST parameters
+ * @vco_offset: offset to the ICST VCO from the provided memory base
+ * @lock_offset: offset to the ICST VCO locking register from the provided
+ * memory base
+ */
struct clk_icst_desc {
const struct icst_params *params;
- struct icst_vco (*getvco)(void);
- void (*setvco)(struct icst_vco);
+ u32 vco_offset;
+ u32 lock_offset;
};
struct clk *icst_clk_register(struct device *dev,
- const struct clk_icst_desc *desc);
+ const struct clk_icst_desc *desc,
+ void __iomem *base);
diff --git a/drivers/clk/versatile/clk-integrator.c b/drivers/clk/versatile/clk-integrator.c
index 3c816ae..08593b4 100644
--- a/drivers/clk/versatile/clk-integrator.c
+++ b/drivers/clk/versatile/clk-integrator.c
@@ -10,7 +10,7 @@
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/err.h>
-#include <linux/io.h>
+#include <linux/platform_data/clk-integrator.h>
#include <mach/hardware.h>
#include <mach/platform.h>
@@ -22,42 +22,6 @@
* Inspired by portions of:
* plat-versatile/clock.c and plat-versatile/include/plat/clock.h
*/
-#define CM_LOCK (__io_address(INTEGRATOR_HDR_BASE)+INTEGRATOR_HDR_LOCK_OFFSET)
-#define CM_AUXOSC (__io_address(INTEGRATOR_HDR_BASE)+0x1c)
-
-/**
- * cp_auxvco_get() - get ICST VCO settings for the Integrator/CP
- * @vco: ICST VCO parameters to update with hardware status
- */
-static struct icst_vco cp_auxvco_get(void)
-{
- u32 val;
- struct icst_vco vco;
-
- val = readl(CM_AUXOSC);
- vco.v = val & 0x1ff;
- vco.r = (val >> 9) & 0x7f;
- vco.s = (val >> 16) & 03;
- return vco;
-}
-
-/**
- * cp_auxvco_set() - commit changes to Integrator/CP ICST VCO
- * @vco: ICST VCO parameters to commit
- */
-static void cp_auxvco_set(struct icst_vco vco)
-{
- u32 val;
-
- val = readl(CM_AUXOSC) & ~0x7ffff;
- val |= vco.v | (vco.r << 9) | (vco.s << 16);
-
- /* This magic unlocks the CM VCO so it can be controlled */
- writel(0xa05f, CM_LOCK);
- writel(val, CM_AUXOSC);
- /* This locks the CM again */
- writel(0, CM_LOCK);
-}
static const struct icst_params cp_auxvco_params = {
.ref = 24000000,
@@ -73,8 +37,8 @@ static const struct icst_params cp_auxvco_params = {
static const struct clk_icst_desc __initdata cp_icst_desc = {
.params = &cp_auxvco_params,
- .getvco = cp_auxvco_get,
- .setvco = cp_auxvco_set,
+ .vco_offset = 0x1c,
+ .lock_offset = INTEGRATOR_HDR_LOCK_OFFSET,
};
/*
@@ -114,6 +78,7 @@ void __init integrator_clk_init(bool is_cp)
clk_register_clkdev(clk, NULL, "sp804");
/* ICST VCO clock used on the Integrator/CP CLCD */
- clk = icst_clk_register(NULL, &cp_icst_desc);
+ clk = icst_clk_register(NULL, &cp_icst_desc,
+ __io_address(INTEGRATOR_HDR_BASE));
clk_register_clkdev(clk, NULL, "clcd");
}
diff --git a/drivers/clk/versatile/clk-realview.c b/drivers/clk/versatile/clk-realview.c
index fd2dbdb..cda07e7 100644
--- a/drivers/clk/versatile/clk-realview.c
+++ b/drivers/clk/versatile/clk-realview.c
@@ -21,38 +21,6 @@
* Implementation of the ARM RealView clock trees.
*/
-static void __iomem *sys_lock;
-static void __iomem *sys_vcoreg;
-
-/**
- * realview_oscvco_get() - get ICST OSC settings for the RealView
- */
-static struct icst_vco realview_oscvco_get(void)
-{
- u32 val;
- struct icst_vco vco;
-
- val = readl(sys_vcoreg);
- vco.v = val & 0x1ff;
- vco.r = (val >> 9) & 0x7f;
- vco.s = (val >> 16) & 03;
- return vco;
-}
-
-static void realview_oscvco_set(struct icst_vco vco)
-{
- u32 val;
-
- val = readl(sys_vcoreg) & ~0x7ffff;
- val |= vco.v | (vco.r << 9) | (vco.s << 16);
-
- /* This magic unlocks the CM VCO so it can be controlled */
- writel(0xa05f, sys_lock);
- writel(val, sys_vcoreg);
- /* This locks the CM again */
- writel(0, sys_lock);
-}
-
static const struct icst_params realview_oscvco_params = {
.ref = 24000000,
.vco_max = ICST307_VCO_MAX,
@@ -65,10 +33,16 @@ static const struct icst_params realview_oscvco_params = {
.idx2s = icst307_idx2s,
};
-static const struct clk_icst_desc __initdata realview_icst_desc = {
+static const struct clk_icst_desc __initdata realview_osc0_desc = {
.params = &realview_oscvco_params,
- .getvco = realview_oscvco_get,
- .setvco = realview_oscvco_set,
+ .vco_offset = REALVIEW_SYS_OSC0_OFFSET,
+ .lock_offset = REALVIEW_SYS_LOCK_OFFSET,
+};
+
+static const struct clk_icst_desc __initdata realview_osc4_desc = {
+ .params = &realview_oscvco_params,
+ .vco_offset = REALVIEW_SYS_OSC4_OFFSET,
+ .lock_offset = REALVIEW_SYS_LOCK_OFFSET,
};
/*
@@ -78,13 +52,6 @@ void __init realview_clk_init(void __iomem *sysbase, bool is_pb1176)
{
struct clk *clk;
- sys_lock = sysbase + REALVIEW_SYS_LOCK_OFFSET;
- if (is_pb1176)
- sys_vcoreg = sysbase + REALVIEW_SYS_OSC0_OFFSET;
- else
- sys_vcoreg = sysbase + REALVIEW_SYS_OSC4_OFFSET;
-
-
/* APB clock dummy */
clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, CLK_IS_ROOT, 0);
clk_register_clkdev(clk, "apb_pclk", NULL);
@@ -116,7 +83,11 @@ void __init realview_clk_init(void __iomem *sysbase, bool is_pb1176)
clk_register_clkdev(clk, NULL, "sp804");
/* ICST VCO clock */
- clk = icst_clk_register(NULL, &realview_icst_desc);
+ if (is_pb1176)
+ clk = icst_clk_register(NULL, &realview_osc0_desc, sysbase);
+ else
+ clk = icst_clk_register(NULL, &realview_osc4_desc, sysbase);
+
clk_register_clkdev(clk, NULL, "dev:clcd");
clk_register_clkdev(clk, NULL, "issp:clcd");
}
--
1.7.11.7
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