[PATCH v2 3/5] ARM: OMAP4: PM: Move DPLL control apis to dpll.c
Rajendra Nayak
rnayak at ti.com
Tue Dec 8 13:31:45 EST 2009
This patch moves all the dpll control api's to a
common file dpll.c. This is in preperation of omap4
support wherein most of these api's can be reused.
Signed-off-by: Rajendra Nayak <rnayak at ti.com>
Cc: Paul Walmsley <paul at pwsan.com>
Cc: Benoit Cousson <b-cousson at ti.com>
---
arch/arm/mach-omap2/Makefile | 3 +-
arch/arm/mach-omap2/clock.h | 13 +
arch/arm/mach-omap2/clock34xx.c | 489 -----------------------------------
arch/arm/mach-omap2/clock34xx.h | 11 -
arch/arm/mach-omap2/clock44xx.h | 8 -
arch/arm/mach-omap2/dpll.c | 532 +++++++++++++++++++++++++++++++++++++++
6 files changed, 547 insertions(+), 509 deletions(-)
create mode 100644 arch/arm/mach-omap2/dpll.c
diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index e3743cf..e5946c1 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -10,7 +10,8 @@ prcm-common = prcm.o powerdomain.o
clock-common = clock.o clock_common_data.o clockdomain.o
obj-$(CONFIG_ARCH_OMAP2) += $(omap-2-3-common) $(prcm-common) $(clock-common)
-obj-$(CONFIG_ARCH_OMAP3) += $(omap-2-3-common) $(prcm-common) $(clock-common)
+obj-$(CONFIG_ARCH_OMAP3) += $(omap-2-3-common) $(prcm-common) $(clock-common) \
+ dpll.o
obj-$(CONFIG_ARCH_OMAP4) += prcm.o clock.o
obj-$(CONFIG_OMAP_MCBSP) += mcbsp.o
diff --git a/arch/arm/mach-omap2/clock.h b/arch/arm/mach-omap2/clock.h
index 87c0805..4df7aa4 100644
--- a/arch/arm/mach-omap2/clock.h
+++ b/arch/arm/mach-omap2/clock.h
@@ -36,6 +36,11 @@
#define OMAP3XXX_EN_DPLL_FRBYPASS 0x6
#define OMAP3XXX_EN_DPLL_LOCKED 0x7
+/* CM_CLKEN_PLL*.EN* bit values - not all are available for every DPLL */
+#define DPLL_LOW_POWER_STOP 0x1
+#define DPLL_LOW_POWER_BYPASS 0x5
+#define DPLL_LOCKED 0x7
+
int omap2_clk_init(void);
int omap2_clk_enable(struct clk *clk);
void omap2_clk_disable(struct clk *clk);
@@ -44,6 +49,14 @@ int omap2_clk_set_rate(struct clk *clk, unsigned long rate);
int omap2_clk_set_parent(struct clk *clk, struct clk *new_parent);
int omap2_dpll_set_rate_tolerance(struct clk *clk, unsigned int tolerance);
long omap2_dpll_round_rate(struct clk *clk, unsigned long target_rate);
+unsigned long omap3_dpll_recalc(struct clk *clk);
+unsigned long omap3_clkoutx2_recalc(struct clk *clk);
+void omap3_dpll_allow_idle(struct clk *clk);
+void omap3_dpll_deny_idle(struct clk *clk);
+u32 omap3_dpll_autoidle_read(struct clk *clk);
+int omap3_noncore_dpll_set_rate(struct clk *clk, unsigned long rate);
+int omap3_noncore_dpll_enable(struct clk *clk);
+void omap3_noncore_dpll_disable(struct clk *clk);
#ifdef CONFIG_OMAP_RESET_CLOCKS
void omap2_clk_disable_unused(struct clk *clk);
diff --git a/arch/arm/mach-omap2/clock34xx.c b/arch/arm/mach-omap2/clock34xx.c
index 7dffbfc..d4217b9 100644
--- a/arch/arm/mach-omap2/clock34xx.c
+++ b/arch/arm/mach-omap2/clock34xx.c
@@ -42,12 +42,6 @@
#include "cm.h"
#include "cm-regbits-34xx.h"
-/* CM_AUTOIDLE_PLL*.AUTO_* bit values */
-#define DPLL_AUTOIDLE_DISABLE 0x0
-#define DPLL_AUTOIDLE_LOW_POWER_STOP 0x1
-
-#define MAX_DPLL_WAIT_TRIES 1000000
-
#define CYCLES_PER_MHZ 1000000
/*
@@ -148,376 +142,11 @@ const struct clkops clkops_omap3430es2_hsotgusb_wait = {
.find_companion = omap2_clk_dflt_find_companion,
};
-/**
- * omap3_dpll_recalc - recalculate DPLL rate
- * @clk: DPLL struct clk
- *
- * Recalculate and propagate the DPLL rate.
- */
-unsigned long omap3_dpll_recalc(struct clk *clk)
-{
- return omap2_get_dpll_rate(clk);
-}
-
-/* _omap3_dpll_write_clken - write clken_bits arg to a DPLL's enable bits */
-static void _omap3_dpll_write_clken(struct clk *clk, u8 clken_bits)
-{
- const struct dpll_data *dd;
- u32 v;
-
- dd = clk->dpll_data;
-
- v = __raw_readl(dd->control_reg);
- v &= ~dd->enable_mask;
- v |= clken_bits << __ffs(dd->enable_mask);
- __raw_writel(v, dd->control_reg);
-}
-
-/* _omap3_wait_dpll_status: wait for a DPLL to enter a specific state */
-static int _omap3_wait_dpll_status(struct clk *clk, u8 state)
-{
- const struct dpll_data *dd;
- int i = 0;
- int ret = -EINVAL;
-
- dd = clk->dpll_data;
-
- state <<= __ffs(dd->idlest_mask);
-
- while (((__raw_readl(dd->idlest_reg) & dd->idlest_mask) != state) &&
- i < MAX_DPLL_WAIT_TRIES) {
- i++;
- udelay(1);
- }
-
- if (i == MAX_DPLL_WAIT_TRIES) {
- printk(KERN_ERR "clock: %s failed transition to '%s'\n",
- clk->name, (state) ? "locked" : "bypassed");
- } else {
- pr_debug("clock: %s transition to '%s' in %d loops\n",
- clk->name, (state) ? "locked" : "bypassed", i);
-
- ret = 0;
- }
-
- return ret;
-}
-
-/* From 3430 TRM ES2 4.7.6.2 */
-static u16 _omap3_dpll_compute_freqsel(struct clk *clk, u8 n)
-{
- unsigned long fint;
- u16 f = 0;
-
- fint = clk->dpll_data->clk_ref->rate / n;
-
- pr_debug("clock: fint is %lu\n", fint);
-
- if (fint >= 750000 && fint <= 1000000)
- f = 0x3;
- else if (fint > 1000000 && fint <= 1250000)
- f = 0x4;
- else if (fint > 1250000 && fint <= 1500000)
- f = 0x5;
- else if (fint > 1500000 && fint <= 1750000)
- f = 0x6;
- else if (fint > 1750000 && fint <= 2100000)
- f = 0x7;
- else if (fint > 7500000 && fint <= 10000000)
- f = 0xB;
- else if (fint > 10000000 && fint <= 12500000)
- f = 0xC;
- else if (fint > 12500000 && fint <= 15000000)
- f = 0xD;
- else if (fint > 15000000 && fint <= 17500000)
- f = 0xE;
- else if (fint > 17500000 && fint <= 21000000)
- f = 0xF;
- else
- pr_debug("clock: unknown freqsel setting for %d\n", n);
-
- return f;
-}
-
-/* Non-CORE DPLL (e.g., DPLLs that do not control SDRC) clock functions */
-
-/*
- * _omap3_noncore_dpll_lock - instruct a DPLL to lock and wait for readiness
- * @clk: pointer to a DPLL struct clk
- *
- * Instructs a non-CORE DPLL to lock. Waits for the DPLL to report
- * readiness before returning. Will save and restore the DPLL's
- * autoidle state across the enable, per the CDP code. If the DPLL
- * locked successfully, return 0; if the DPLL did not lock in the time
- * allotted, or DPLL3 was passed in, return -EINVAL.
- */
-static int _omap3_noncore_dpll_lock(struct clk *clk)
-{
- u8 ai;
- int r;
-
- pr_debug("clock: locking DPLL %s\n", clk->name);
-
- ai = omap3_dpll_autoidle_read(clk);
-
- omap3_dpll_deny_idle(clk);
-
- _omap3_dpll_write_clken(clk, DPLL_LOCKED);
-
- r = _omap3_wait_dpll_status(clk, 1);
-
- if (ai)
- omap3_dpll_allow_idle(clk);
-
- return r;
-}
-
-/*
- * _omap3_noncore_dpll_bypass - instruct a DPLL to bypass and wait for readiness
- * @clk: pointer to a DPLL struct clk
- *
- * Instructs a non-CORE DPLL to enter low-power bypass mode. In
- * bypass mode, the DPLL's rate is set equal to its parent clock's
- * rate. Waits for the DPLL to report readiness before returning.
- * Will save and restore the DPLL's autoidle state across the enable,
- * per the CDP code. If the DPLL entered bypass mode successfully,
- * return 0; if the DPLL did not enter bypass in the time allotted, or
- * DPLL3 was passed in, or the DPLL does not support low-power bypass,
- * return -EINVAL.
- */
-static int _omap3_noncore_dpll_bypass(struct clk *clk)
-{
- int r;
- u8 ai;
-
- if (!(clk->dpll_data->modes & (1 << DPLL_LOW_POWER_BYPASS)))
- return -EINVAL;
-
- pr_debug("clock: configuring DPLL %s for low-power bypass\n",
- clk->name);
-
- ai = omap3_dpll_autoidle_read(clk);
-
- _omap3_dpll_write_clken(clk, DPLL_LOW_POWER_BYPASS);
-
- r = _omap3_wait_dpll_status(clk, 0);
-
- if (ai)
- omap3_dpll_allow_idle(clk);
- else
- omap3_dpll_deny_idle(clk);
-
- return r;
-}
-
-/*
- * _omap3_noncore_dpll_stop - instruct a DPLL to stop
- * @clk: pointer to a DPLL struct clk
- *
- * Instructs a non-CORE DPLL to enter low-power stop. Will save and
- * restore the DPLL's autoidle state across the stop, per the CDP
- * code. If DPLL3 was passed in, or the DPLL does not support
- * low-power stop, return -EINVAL; otherwise, return 0.
- */
-static int _omap3_noncore_dpll_stop(struct clk *clk)
-{
- u8 ai;
-
- if (!(clk->dpll_data->modes & (1 << DPLL_LOW_POWER_STOP)))
- return -EINVAL;
-
- pr_debug("clock: stopping DPLL %s\n", clk->name);
-
- ai = omap3_dpll_autoidle_read(clk);
-
- _omap3_dpll_write_clken(clk, DPLL_LOW_POWER_STOP);
-
- if (ai)
- omap3_dpll_allow_idle(clk);
- else
- omap3_dpll_deny_idle(clk);
-
- return 0;
-}
-
-/**
- * omap3_noncore_dpll_enable - instruct a DPLL to enter bypass or lock mode
- * @clk: pointer to a DPLL struct clk
- *
- * Instructs a non-CORE DPLL to enable, e.g., to enter bypass or lock.
- * The choice of modes depends on the DPLL's programmed rate: if it is
- * the same as the DPLL's parent clock, it will enter bypass;
- * otherwise, it will enter lock. This code will wait for the DPLL to
- * indicate readiness before returning, unless the DPLL takes too long
- * to enter the target state. Intended to be used as the struct clk's
- * enable function. If DPLL3 was passed in, or the DPLL does not
- * support low-power stop, or if the DPLL took too long to enter
- * bypass or lock, return -EINVAL; otherwise, return 0.
- */
-static int omap3_noncore_dpll_enable(struct clk *clk)
-{
- int r;
- struct dpll_data *dd;
-
- dd = clk->dpll_data;
- if (!dd)
- return -EINVAL;
-
- if (clk->rate == dd->clk_bypass->rate) {
- WARN_ON(clk->parent != dd->clk_bypass);
- r = _omap3_noncore_dpll_bypass(clk);
- } else {
- WARN_ON(clk->parent != dd->clk_ref);
- r = _omap3_noncore_dpll_lock(clk);
- }
- /* FIXME: this is dubious - if clk->rate has changed, what about propagating? */
- if (!r)
- clk->rate = omap2_get_dpll_rate(clk);
-
- return r;
-}
-
-/**
- * omap3_noncore_dpll_disable - instruct a DPLL to enter low-power stop
- * @clk: pointer to a DPLL struct clk
- *
- * Instructs a non-CORE DPLL to enter low-power stop. This function is
- * intended for use in struct clkops. No return value.
- */
-static void omap3_noncore_dpll_disable(struct clk *clk)
-{
- _omap3_noncore_dpll_stop(clk);
-}
-
const struct clkops clkops_noncore_dpll_ops = {
.enable = omap3_noncore_dpll_enable,
.disable = omap3_noncore_dpll_disable,
};
-/* Non-CORE DPLL rate set code */
-
-/*
- * omap3_noncore_dpll_program - set non-core DPLL M,N values directly
- * @clk: struct clk * of DPLL to set
- * @m: DPLL multiplier to set
- * @n: DPLL divider to set
- * @freqsel: FREQSEL value to set
- *
- * Program the DPLL with the supplied M, N values, and wait for the DPLL to
- * lock.. Returns -EINVAL upon error, or 0 upon success.
- */
-static int omap3_noncore_dpll_program(struct clk *clk, u16 m, u8 n, u16 freqsel)
-{
- struct dpll_data *dd = clk->dpll_data;
- u32 v;
-
- /* 3430 ES2 TRM: 4.7.6.9 DPLL Programming Sequence */
- _omap3_noncore_dpll_bypass(clk);
-
- /* Set jitter correction */
- v = __raw_readl(dd->control_reg);
- v &= ~dd->freqsel_mask;
- v |= freqsel << __ffs(dd->freqsel_mask);
- __raw_writel(v, dd->control_reg);
-
- /* Set DPLL multiplier, divider */
- v = __raw_readl(dd->mult_div1_reg);
- v &= ~(dd->mult_mask | dd->div1_mask);
- v |= m << __ffs(dd->mult_mask);
- v |= (n - 1) << __ffs(dd->div1_mask);
- __raw_writel(v, dd->mult_div1_reg);
-
- /* We let the clock framework set the other output dividers later */
-
- /* REVISIT: Set ramp-up delay? */
-
- _omap3_noncore_dpll_lock(clk);
-
- return 0;
-}
-
-/**
- * omap3_noncore_dpll_set_rate - set non-core DPLL rate
- * @clk: struct clk * of DPLL to set
- * @rate: rounded target rate
- *
- * Set the DPLL CLKOUT to the target rate. If the DPLL can enter
- * low-power bypass, and the target rate is the bypass source clock
- * rate, then configure the DPLL for bypass. Otherwise, round the
- * target rate if it hasn't been done already, then program and lock
- * the DPLL. Returns -EINVAL upon error, or 0 upon success.
- */
-int omap3_noncore_dpll_set_rate(struct clk *clk, unsigned long rate)
-{
- struct clk *new_parent = NULL;
- u16 freqsel;
- struct dpll_data *dd;
- int ret;
-
- if (!clk || !rate)
- return -EINVAL;
-
- dd = clk->dpll_data;
- if (!dd)
- return -EINVAL;
-
- if (rate == omap2_get_dpll_rate(clk))
- return 0;
-
- /*
- * Ensure both the bypass and ref clocks are enabled prior to
- * doing anything; we need the bypass clock running to reprogram
- * the DPLL.
- */
- omap2_clk_enable(dd->clk_bypass);
- omap2_clk_enable(dd->clk_ref);
-
- if (dd->clk_bypass->rate == rate &&
- (clk->dpll_data->modes & (1 << DPLL_LOW_POWER_BYPASS))) {
- pr_debug("clock: %s: set rate: entering bypass.\n", clk->name);
-
- ret = _omap3_noncore_dpll_bypass(clk);
- if (!ret)
- new_parent = dd->clk_bypass;
- } else {
- if (dd->last_rounded_rate != rate)
- omap2_dpll_round_rate(clk, rate);
-
- if (dd->last_rounded_rate == 0)
- return -EINVAL;
-
- freqsel = _omap3_dpll_compute_freqsel(clk, dd->last_rounded_n);
- if (!freqsel)
- WARN_ON(1);
-
- pr_debug("clock: %s: set rate: locking rate to %lu.\n",
- clk->name, rate);
-
- ret = omap3_noncore_dpll_program(clk, dd->last_rounded_m,
- dd->last_rounded_n, freqsel);
- if (!ret)
- new_parent = dd->clk_ref;
- }
- if (!ret) {
- /*
- * Switch the parent clock in the heirarchy, and make sure
- * that the new parent's usecount is correct. Note: we
- * enable the new parent before disabling the old to avoid
- * any unnecessary hardware disable->enable transitions.
- */
- if (clk->usecount) {
- omap2_clk_enable(new_parent);
- omap2_clk_disable(clk->parent);
- }
- clk_reparent(clk, new_parent);
- clk->rate = rate;
- }
- omap2_clk_disable(dd->clk_ref);
- omap2_clk_disable(dd->clk_bypass);
-
- return 0;
-}
-
int omap3_dpll4_set_rate(struct clk *clk, unsigned long rate)
{
/*
@@ -621,124 +250,6 @@ int omap3_core_dpll_m2_set_rate(struct clk *clk, unsigned long rate)
return 0;
}
-
-/* DPLL autoidle read/set code */
-
-
-/**
- * omap3_dpll_autoidle_read - read a DPLL's autoidle bits
- * @clk: struct clk * of the DPLL to read
- *
- * Return the DPLL's autoidle bits, shifted down to bit 0. Returns
- * -EINVAL if passed a null pointer or if the struct clk does not
- * appear to refer to a DPLL.
- */
-u32 omap3_dpll_autoidle_read(struct clk *clk)
-{
- const struct dpll_data *dd;
- u32 v;
-
- if (!clk || !clk->dpll_data)
- return -EINVAL;
-
- dd = clk->dpll_data;
-
- v = __raw_readl(dd->autoidle_reg);
- v &= dd->autoidle_mask;
- v >>= __ffs(dd->autoidle_mask);
-
- return v;
-}
-
-/**
- * omap3_dpll_allow_idle - enable DPLL autoidle bits
- * @clk: struct clk * of the DPLL to operate on
- *
- * Enable DPLL automatic idle control. This automatic idle mode
- * switching takes effect only when the DPLL is locked, at least on
- * OMAP3430. The DPLL will enter low-power stop when its downstream
- * clocks are gated. No return value.
- */
-void omap3_dpll_allow_idle(struct clk *clk)
-{
- const struct dpll_data *dd;
- u32 v;
-
- if (!clk || !clk->dpll_data)
- return;
-
- dd = clk->dpll_data;
-
- /*
- * REVISIT: CORE DPLL can optionally enter low-power bypass
- * by writing 0x5 instead of 0x1. Add some mechanism to
- * optionally enter this mode.
- */
- v = __raw_readl(dd->autoidle_reg);
- v &= ~dd->autoidle_mask;
- v |= DPLL_AUTOIDLE_LOW_POWER_STOP << __ffs(dd->autoidle_mask);
- __raw_writel(v, dd->autoidle_reg);
-}
-
-/**
- * omap3_dpll_deny_idle - prevent DPLL from automatically idling
- * @clk: struct clk * of the DPLL to operate on
- *
- * Disable DPLL automatic idle control. No return value.
- */
-void omap3_dpll_deny_idle(struct clk *clk)
-{
- const struct dpll_data *dd;
- u32 v;
-
- if (!clk || !clk->dpll_data)
- return;
-
- dd = clk->dpll_data;
-
- v = __raw_readl(dd->autoidle_reg);
- v &= ~dd->autoidle_mask;
- v |= DPLL_AUTOIDLE_DISABLE << __ffs(dd->autoidle_mask);
- __raw_writel(v, dd->autoidle_reg);
-}
-
-/* Clock control for DPLL outputs */
-
-/**
- * omap3_clkoutx2_recalc - recalculate DPLL X2 output virtual clock rate
- * @clk: DPLL output struct clk
- *
- * Using parent clock DPLL data, look up DPLL state. If locked, set our
- * rate to the dpll_clk * 2; otherwise, just use dpll_clk.
- */
-unsigned long omap3_clkoutx2_recalc(struct clk *clk)
-{
- const struct dpll_data *dd;
- unsigned long rate;
- u32 v;
- struct clk *pclk;
-
- /* Walk up the parents of clk, looking for a DPLL */
- pclk = clk->parent;
- while (pclk && !pclk->dpll_data)
- pclk = pclk->parent;
-
- /* clk does not have a DPLL as a parent? */
- WARN_ON(!pclk);
-
- dd = pclk->dpll_data;
-
- WARN_ON(!dd->enable_mask);
-
- v = __raw_readl(dd->control_reg) & dd->enable_mask;
- v >>= __ffs(dd->enable_mask);
- if (v != OMAP3XXX_EN_DPLL_LOCKED)
- rate = clk->parent->rate;
- else
- rate = clk->parent->rate * 2;
- return rate;
-}
-
/* Common clock code */
/*
diff --git a/arch/arm/mach-omap2/clock34xx.h b/arch/arm/mach-omap2/clock34xx.h
index b08809e..9a2c07e 100644
--- a/arch/arm/mach-omap2/clock34xx.h
+++ b/arch/arm/mach-omap2/clock34xx.h
@@ -8,21 +8,10 @@
#ifndef __ARCH_ARM_MACH_OMAP2_CLOCK_34XX_H
#define __ARCH_ARM_MACH_OMAP2_CLOCK_34XX_H
-unsigned long omap3_dpll_recalc(struct clk *clk);
-unsigned long omap3_clkoutx2_recalc(struct clk *clk);
-void omap3_dpll_allow_idle(struct clk *clk);
-void omap3_dpll_deny_idle(struct clk *clk);
-u32 omap3_dpll_autoidle_read(struct clk *clk);
-int omap3_noncore_dpll_set_rate(struct clk *clk, unsigned long rate);
int omap3_dpll4_set_rate(struct clk *clk, unsigned long rate);
int omap3_core_dpll_m2_set_rate(struct clk *clk, unsigned long rate);
void omap3_clk_lock_dpll5(void);
-/* CM_CLKEN_PLL*.EN* bit values - not all are available for every DPLL */
-#define DPLL_LOW_POWER_STOP 0x1
-#define DPLL_LOW_POWER_BYPASS 0x5
-#define DPLL_LOCKED 0x7
-
extern struct clk *sdrc_ick_p;
extern struct clk *arm_fck_p;
diff --git a/arch/arm/mach-omap2/clock44xx.h b/arch/arm/mach-omap2/clock44xx.h
index c1bc4b6..59b9ced 100644
--- a/arch/arm/mach-omap2/clock44xx.h
+++ b/arch/arm/mach-omap2/clock44xx.h
@@ -7,14 +7,6 @@
#ifndef __ARCH_ARM_MACH_OMAP2_CLOCK_44XX_H
#define __ARCH_ARM_MACH_OMAP2_CLOCK_44XX_H
-unsigned long omap3_dpll_recalc(struct clk *clk);
-unsigned long omap3_clkoutx2_recalc(struct clk *clk);
-int omap3_noncore_dpll_set_rate(struct clk *clk, unsigned long rate);
-
-/* DPLL modes */
-#define DPLL_LOW_POWER_STOP 0x1
-#define DPLL_LOW_POWER_BYPASS 0x5
-#define DPLL_LOCKED 0x7
#define OMAP4430_MAX_DPLL_MULT 2048
#define OMAP4430_MAX_DPLL_DIV 128
diff --git a/arch/arm/mach-omap2/dpll.c b/arch/arm/mach-omap2/dpll.c
new file mode 100644
index 0000000..d55f8df
--- /dev/null
+++ b/arch/arm/mach-omap2/dpll.c
@@ -0,0 +1,532 @@
+/*
+ * OMAP3/4 - specific DPLL control functions
+ *
+ * Copyright (C) 2009 Texas Instruments, Inc.
+ * Copyright (C) 2009 Nokia Corporation
+ *
+ * Written by Paul Walmsley
+ * Testing and integration fixes by Jouni Högander
+ *
+ * Parts of this code are based on code written by
+ * Richard Woodruff, Tony Lindgren, Tuukka Tikkanen, Karthik Dasu
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/limits.h>
+#include <linux/bitops.h>
+
+#include <mach/cpu.h>
+#include <mach/clock.h>
+#include <mach/sram.h>
+#include <asm/div64.h>
+#include <asm/clkdev.h>
+
+#include "clock.h"
+#include "prm.h"
+#include "prm-regbits-34xx.h"
+#include "cm.h"
+#include "cm-regbits-34xx.h"
+
+/* CM_AUTOIDLE_PLL*.AUTO_* bit values */
+#define DPLL_AUTOIDLE_DISABLE 0x0
+#define DPLL_AUTOIDLE_LOW_POWER_STOP 0x1
+
+#define MAX_DPLL_WAIT_TRIES 1000000
+
+
+/**
+ * omap3_dpll_recalc - recalculate DPLL rate
+ * @clk: DPLL struct clk
+ *
+ * Recalculate and propagate the DPLL rate.
+ */
+unsigned long omap3_dpll_recalc(struct clk *clk)
+{
+ return omap2_get_dpll_rate(clk);
+}
+
+/* _omap3_dpll_write_clken - write clken_bits arg to a DPLL's enable bits */
+static void _omap3_dpll_write_clken(struct clk *clk, u8 clken_bits)
+{
+ const struct dpll_data *dd;
+ u32 v;
+
+ dd = clk->dpll_data;
+
+ v = __raw_readl(dd->control_reg);
+ v &= ~dd->enable_mask;
+ v |= clken_bits << __ffs(dd->enable_mask);
+ __raw_writel(v, dd->control_reg);
+}
+
+/* _omap3_wait_dpll_status: wait for a DPLL to enter a specific state */
+static int _omap3_wait_dpll_status(struct clk *clk, u8 state)
+{
+ const struct dpll_data *dd;
+ int i = 0;
+ int ret = -EINVAL;
+
+ dd = clk->dpll_data;
+
+ state <<= __ffs(dd->idlest_mask);
+
+ while (((__raw_readl(dd->idlest_reg) & dd->idlest_mask) != state) &&
+ i < MAX_DPLL_WAIT_TRIES) {
+ i++;
+ udelay(1);
+ }
+
+ if (i == MAX_DPLL_WAIT_TRIES) {
+ printk(KERN_ERR "clock: %s failed transition to '%s'\n",
+ clk->name, (state) ? "locked" : "bypassed");
+ } else {
+ pr_debug("clock: %s transition to '%s' in %d loops\n",
+ clk->name, (state) ? "locked" : "bypassed", i);
+
+ ret = 0;
+ }
+
+ return ret;
+}
+
+/* From 3430 TRM ES2 4.7.6.2 */
+static u16 _omap3_dpll_compute_freqsel(struct clk *clk, u8 n)
+{
+ unsigned long fint;
+ u16 f = 0;
+
+ fint = clk->dpll_data->clk_ref->rate / n;
+
+ pr_debug("clock: fint is %lu\n", fint);
+
+ if (fint >= 750000 && fint <= 1000000)
+ f = 0x3;
+ else if (fint > 1000000 && fint <= 1250000)
+ f = 0x4;
+ else if (fint > 1250000 && fint <= 1500000)
+ f = 0x5;
+ else if (fint > 1500000 && fint <= 1750000)
+ f = 0x6;
+ else if (fint > 1750000 && fint <= 2100000)
+ f = 0x7;
+ else if (fint > 7500000 && fint <= 10000000)
+ f = 0xB;
+ else if (fint > 10000000 && fint <= 12500000)
+ f = 0xC;
+ else if (fint > 12500000 && fint <= 15000000)
+ f = 0xD;
+ else if (fint > 15000000 && fint <= 17500000)
+ f = 0xE;
+ else if (fint > 17500000 && fint <= 21000000)
+ f = 0xF;
+ else
+ pr_debug("clock: unknown freqsel setting for %d\n", n);
+
+ return f;
+}
+
+/* Non-CORE DPLL (e.g., DPLLs that do not control SDRC) clock functions */
+
+/*
+ * _omap3_noncore_dpll_lock - instruct a DPLL to lock and wait for readiness
+ * @clk: pointer to a DPLL struct clk
+ *
+ * Instructs a non-CORE DPLL to lock. Waits for the DPLL to report
+ * readiness before returning. Will save and restore the DPLL's
+ * autoidle state across the enable, per the CDP code. If the DPLL
+ * locked successfully, return 0; if the DPLL did not lock in the time
+ * allotted, or DPLL3 was passed in, return -EINVAL.
+ */
+static int _omap3_noncore_dpll_lock(struct clk *clk)
+{
+ u8 ai;
+ int r;
+
+ pr_debug("clock: locking DPLL %s\n", clk->name);
+
+ ai = omap3_dpll_autoidle_read(clk);
+
+ omap3_dpll_deny_idle(clk);
+
+ _omap3_dpll_write_clken(clk, DPLL_LOCKED);
+
+ r = _omap3_wait_dpll_status(clk, 1);
+
+ if (ai)
+ omap3_dpll_allow_idle(clk);
+
+ return r;
+}
+
+/*
+ * _omap3_noncore_dpll_bypass - instruct a DPLL to bypass and wait for readiness
+ * @clk: pointer to a DPLL struct clk
+ *
+ * Instructs a non-CORE DPLL to enter low-power bypass mode. In
+ * bypass mode, the DPLL's rate is set equal to its parent clock's
+ * rate. Waits for the DPLL to report readiness before returning.
+ * Will save and restore the DPLL's autoidle state across the enable,
+ * per the CDP code. If the DPLL entered bypass mode successfully,
+ * return 0; if the DPLL did not enter bypass in the time allotted, or
+ * DPLL3 was passed in, or the DPLL does not support low-power bypass,
+ * return -EINVAL.
+ */
+static int _omap3_noncore_dpll_bypass(struct clk *clk)
+{
+ int r;
+ u8 ai;
+
+ if (!(clk->dpll_data->modes & (1 << DPLL_LOW_POWER_BYPASS)))
+ return -EINVAL;
+
+ pr_debug("clock: configuring DPLL %s for low-power bypass\n",
+ clk->name);
+
+ ai = omap3_dpll_autoidle_read(clk);
+
+ _omap3_dpll_write_clken(clk, DPLL_LOW_POWER_BYPASS);
+
+ r = _omap3_wait_dpll_status(clk, 0);
+
+ if (ai)
+ omap3_dpll_allow_idle(clk);
+ else
+ omap3_dpll_deny_idle(clk);
+
+ return r;
+}
+
+/*
+ * _omap3_noncore_dpll_stop - instruct a DPLL to stop
+ * @clk: pointer to a DPLL struct clk
+ *
+ * Instructs a non-CORE DPLL to enter low-power stop. Will save and
+ * restore the DPLL's autoidle state across the stop, per the CDP
+ * code. If DPLL3 was passed in, or the DPLL does not support
+ * low-power stop, return -EINVAL; otherwise, return 0.
+ */
+static int _omap3_noncore_dpll_stop(struct clk *clk)
+{
+ u8 ai;
+
+ if (!(clk->dpll_data->modes & (1 << DPLL_LOW_POWER_STOP)))
+ return -EINVAL;
+
+ pr_debug("clock: stopping DPLL %s\n", clk->name);
+
+ ai = omap3_dpll_autoidle_read(clk);
+
+ _omap3_dpll_write_clken(clk, DPLL_LOW_POWER_STOP);
+
+ if (ai)
+ omap3_dpll_allow_idle(clk);
+ else
+ omap3_dpll_deny_idle(clk);
+
+ return 0;
+}
+
+/**
+ * omap3_noncore_dpll_enable - instruct a DPLL to enter bypass or lock mode
+ * @clk: pointer to a DPLL struct clk
+ *
+ * Instructs a non-CORE DPLL to enable, e.g., to enter bypass or lock.
+ * The choice of modes depends on the DPLL's programmed rate: if it is
+ * the same as the DPLL's parent clock, it will enter bypass;
+ * otherwise, it will enter lock. This code will wait for the DPLL to
+ * indicate readiness before returning, unless the DPLL takes too long
+ * to enter the target state. Intended to be used as the struct clk's
+ * enable function. If DPLL3 was passed in, or the DPLL does not
+ * support low-power stop, or if the DPLL took too long to enter
+ * bypass or lock, return -EINVAL; otherwise, return 0.
+ */
+int omap3_noncore_dpll_enable(struct clk *clk)
+{
+ int r;
+ struct dpll_data *dd;
+
+ dd = clk->dpll_data;
+ if (!dd)
+ return -EINVAL;
+
+ if (clk->rate == dd->clk_bypass->rate) {
+ WARN_ON(clk->parent != dd->clk_bypass);
+ r = _omap3_noncore_dpll_bypass(clk);
+ } else {
+ WARN_ON(clk->parent != dd->clk_ref);
+ r = _omap3_noncore_dpll_lock(clk);
+ }
+ /*
+ *FIXME: this is dubious - if clk->rate has changed, what about
+ * propagating?
+ */
+ if (!r)
+ clk->rate = omap2_get_dpll_rate(clk);
+
+ return r;
+}
+
+/**
+ * omap3_noncore_dpll_disable - instruct a DPLL to enter low-power stop
+ * @clk: pointer to a DPLL struct clk
+ *
+ * Instructs a non-CORE DPLL to enter low-power stop. This function is
+ * intended for use in struct clkops. No return value.
+ */
+void omap3_noncore_dpll_disable(struct clk *clk)
+{
+ _omap3_noncore_dpll_stop(clk);
+}
+
+
+/* Non-CORE DPLL rate set code */
+
+/*
+ * omap3_noncore_dpll_program - set non-core DPLL M,N values directly
+ * @clk: struct clk * of DPLL to set
+ * @m: DPLL multiplier to set
+ * @n: DPLL divider to set
+ * @freqsel: FREQSEL value to set
+ *
+ * Program the DPLL with the supplied M, N values, and wait for the DPLL to
+ * lock.. Returns -EINVAL upon error, or 0 upon success.
+ */
+int omap3_noncore_dpll_program(struct clk *clk, u16 m, u8 n, u16 freqsel)
+{
+ struct dpll_data *dd = clk->dpll_data;
+ u32 v;
+
+ /* 3430 ES2 TRM: 4.7.6.9 DPLL Programming Sequence */
+ _omap3_noncore_dpll_bypass(clk);
+
+ /* Set jitter correction */
+ v = __raw_readl(dd->control_reg);
+ v &= ~dd->freqsel_mask;
+ v |= freqsel << __ffs(dd->freqsel_mask);
+ __raw_writel(v, dd->control_reg);
+
+ /* Set DPLL multiplier, divider */
+ v = __raw_readl(dd->mult_div1_reg);
+ v &= ~(dd->mult_mask | dd->div1_mask);
+ v |= m << __ffs(dd->mult_mask);
+ v |= (n - 1) << __ffs(dd->div1_mask);
+ __raw_writel(v, dd->mult_div1_reg);
+
+ /* We let the clock framework set the other output dividers later */
+
+ /* REVISIT: Set ramp-up delay? */
+
+ _omap3_noncore_dpll_lock(clk);
+
+ return 0;
+}
+
+/**
+ * omap3_noncore_dpll_set_rate - set non-core DPLL rate
+ * @clk: struct clk * of DPLL to set
+ * @rate: rounded target rate
+ *
+ * Set the DPLL CLKOUT to the target rate. If the DPLL can enter
+ * low-power bypass, and the target rate is the bypass source clock
+ * rate, then configure the DPLL for bypass. Otherwise, round the
+ * target rate if it hasn't been done already, then program and lock
+ * the DPLL. Returns -EINVAL upon error, or 0 upon success.
+ */
+int omap3_noncore_dpll_set_rate(struct clk *clk, unsigned long rate)
+{
+ struct clk *new_parent = NULL;
+ u16 freqsel;
+ struct dpll_data *dd;
+ int ret;
+
+ if (!clk || !rate)
+ return -EINVAL;
+
+ dd = clk->dpll_data;
+ if (!dd)
+ return -EINVAL;
+
+ if (rate == omap2_get_dpll_rate(clk))
+ return 0;
+
+ /*
+ * Ensure both the bypass and ref clocks are enabled prior to
+ * doing anything; we need the bypass clock running to reprogram
+ * the DPLL.
+ */
+ omap2_clk_enable(dd->clk_bypass);
+ omap2_clk_enable(dd->clk_ref);
+
+ if (dd->clk_bypass->rate == rate &&
+ (clk->dpll_data->modes & (1 << DPLL_LOW_POWER_BYPASS))) {
+ pr_debug("clock: %s: set rate: entering bypass.\n", clk->name);
+
+ ret = _omap3_noncore_dpll_bypass(clk);
+ if (!ret)
+ new_parent = dd->clk_bypass;
+ } else {
+ if (dd->last_rounded_rate != rate)
+ omap2_dpll_round_rate(clk, rate);
+
+ if (dd->last_rounded_rate == 0)
+ return -EINVAL;
+
+ freqsel = _omap3_dpll_compute_freqsel(clk, dd->last_rounded_n);
+ if (!freqsel)
+ WARN_ON(1);
+
+ pr_debug("clock: %s: set rate: locking rate to %lu.\n",
+ clk->name, rate);
+
+ ret = omap3_noncore_dpll_program(clk, dd->last_rounded_m,
+ dd->last_rounded_n, freqsel);
+ if (!ret)
+ new_parent = dd->clk_ref;
+ }
+ if (!ret) {
+ /*
+ * Switch the parent clock in the heirarchy, and make sure
+ * that the new parent's usecount is correct. Note: we
+ * enable the new parent before disabling the old to avoid
+ * any unnecessary hardware disable->enable transitions.
+ */
+ if (clk->usecount) {
+ omap2_clk_enable(new_parent);
+ omap2_clk_disable(clk->parent);
+ }
+ clk_reparent(clk, new_parent);
+ clk->rate = rate;
+ }
+ omap2_clk_disable(dd->clk_ref);
+ omap2_clk_disable(dd->clk_bypass);
+
+ return 0;
+}
+
+/* DPLL autoidle read/set code */
+
+/**
+ * omap3_dpll_autoidle_read - read a DPLL's autoidle bits
+ * @clk: struct clk * of the DPLL to read
+ *
+ * Return the DPLL's autoidle bits, shifted down to bit 0. Returns
+ * -EINVAL if passed a null pointer or if the struct clk does not
+ * appear to refer to a DPLL.
+ */
+u32 omap3_dpll_autoidle_read(struct clk *clk)
+{
+ const struct dpll_data *dd;
+ u32 v;
+
+ if (!clk || !clk->dpll_data)
+ return -EINVAL;
+
+ dd = clk->dpll_data;
+
+ v = __raw_readl(dd->autoidle_reg);
+ v &= dd->autoidle_mask;
+ v >>= __ffs(dd->autoidle_mask);
+
+ return v;
+}
+
+/**
+ * omap3_dpll_allow_idle - enable DPLL autoidle bits
+ * @clk: struct clk * of the DPLL to operate on
+ *
+ * Enable DPLL automatic idle control. This automatic idle mode
+ * switching takes effect only when the DPLL is locked, at least on
+ * OMAP3430. The DPLL will enter low-power stop when its downstream
+ * clocks are gated. No return value.
+ */
+void omap3_dpll_allow_idle(struct clk *clk)
+{
+ const struct dpll_data *dd;
+ u32 v;
+
+ if (!clk || !clk->dpll_data)
+ return;
+
+ dd = clk->dpll_data;
+
+ /*
+ * REVISIT: CORE DPLL can optionally enter low-power bypass
+ * by writing 0x5 instead of 0x1. Add some mechanism to
+ * optionally enter this mode.
+ */
+ v = __raw_readl(dd->autoidle_reg);
+ v &= ~dd->autoidle_mask;
+ v |= DPLL_AUTOIDLE_LOW_POWER_STOP << __ffs(dd->autoidle_mask);
+ __raw_writel(v, dd->autoidle_reg);
+}
+
+/**
+ * omap3_dpll_deny_idle - prevent DPLL from automatically idling
+ * @clk: struct clk * of the DPLL to operate on
+ *
+ * Disable DPLL automatic idle control. No return value.
+ */
+void omap3_dpll_deny_idle(struct clk *clk)
+{
+ const struct dpll_data *dd;
+ u32 v;
+
+ if (!clk || !clk->dpll_data)
+ return;
+
+ dd = clk->dpll_data;
+
+ v = __raw_readl(dd->autoidle_reg);
+ v &= ~dd->autoidle_mask;
+ v |= DPLL_AUTOIDLE_DISABLE << __ffs(dd->autoidle_mask);
+ __raw_writel(v, dd->autoidle_reg);
+
+}
+
+/* Clock control for DPLL outputs */
+
+/**
+ * omap3_clkoutx2_recalc - recalculate DPLL X2 output virtual clock rate
+ * @clk: DPLL output struct clk
+ *
+ * Using parent clock DPLL data, look up DPLL state. If locked, set our
+ * rate to the dpll_clk * 2; otherwise, just use dpll_clk.
+ */
+unsigned long omap3_clkoutx2_recalc(struct clk *clk)
+{
+ const struct dpll_data *dd;
+ unsigned long rate;
+ u32 v;
+ struct clk *pclk;
+
+ /* Walk up the parents of clk, looking for a DPLL */
+ pclk = clk->parent;
+ while (pclk && !pclk->dpll_data)
+ pclk = pclk->parent;
+
+ /* clk does not have a DPLL as a parent? */
+ WARN_ON(!pclk);
+
+ dd = pclk->dpll_data;
+
+ WARN_ON(!dd->enable_mask);
+
+ v = __raw_readl(dd->control_reg) & dd->enable_mask;
+ v >>= __ffs(dd->enable_mask);
+ if (v != OMAP3XXX_EN_DPLL_LOCKED)
+ rate = clk->parent->rate;
+ else
+ rate = clk->parent->rate * 2;
+ return rate;
+}
--
1.5.4.7
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