* Cleaned up and modified to use omap shared clock framework by
* Tony Lindgren <tony@atomide.com>
*
+ * Copyright (C) 2007 Texas Instruments, Inc.
+ * Copyright (C) 2007 Nokia Corporation
+ * Paul Walmsley
+ *
* Based on omap1 clock.c, Copyright (C) 2004 - 2005 Nokia corporation
* Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>
*
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
+#undef DEBUG
+
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <asm/arch/clock.h>
#include <asm/arch/sram.h>
+#include <asm/arch/cpu.h>
#include <asm/div64.h>
-#include "prcm-regs.h"
#include "memory.h"
+#include "sdrc.h"
#include "clock.h"
+#include "prm.h"
+#include "prm_regbits_24xx.h"
+#include "cm.h"
+#include "cm_regbits_24xx.h"
+#include "cm_regbits_34xx.h"
-#undef DEBUG
-
-//#define DOWN_VARIABLE_DPLL 1 /* Experimental */
+#define MAX_CLOCK_ENABLE_WAIT 100000
-static struct prcm_config *curr_prcm_set;
-static u32 curr_perf_level = PRCM_FULL_SPEED;
-static struct clk *vclk;
-static struct clk *sclk;
+u8 cpu_mask;
/*-------------------------------------------------------------------------
* Omap2 specific clock functions
*-------------------------------------------------------------------------*/
-/* Recalculate SYST_CLK */
-static void omap2_sys_clk_recalc(struct clk * clk)
+u8 mask_to_shift(u32 mask)
{
- u32 div = PRCM_CLKSRC_CTRL;
- div &= (1 << 7) | (1 << 6); /* Test if ext clk divided by 1 or 2 */
- div >>= clk->rate_offset;
- clk->rate = (clk->parent->rate / div);
- propagate_rate(clk);
+ return ffs(mask) - 1;
}
-static u32 omap2_get_dpll_rate(struct clk * tclk)
+/**
+ * omap2_init_clksel_parent - set a clksel clk's parent field from the hardware
+ * @clk: OMAP clock struct ptr to use
+ *
+ * Given a pointer to a source-selectable struct clk, read the hardware
+ * register and determine what its parent is currently set to. Update the
+ * clk->parent field with the appropriate clk ptr.
+ */
+void omap2_init_clksel_parent(struct clk *clk)
{
- long long dpll_clk;
- int dpll_mult, dpll_div, amult;
+ const struct clksel *clks;
+ const struct clksel_rate *clkr;
+ u32 r, found = 0;
- dpll_mult = (CM_CLKSEL1_PLL >> 12) & 0x03ff; /* 10 bits */
- dpll_div = (CM_CLKSEL1_PLL >> 8) & 0x0f; /* 4 bits */
- dpll_clk = (long long)tclk->parent->rate * dpll_mult;
- do_div(dpll_clk, dpll_div + 1);
- amult = CM_CLKSEL2_PLL & 0x3;
- dpll_clk *= amult;
+ if (!clk->clksel)
+ return;
- return dpll_clk;
-}
+ r = __raw_readl(clk->clksel_reg) & clk->clksel_mask;
+ r >>= mask_to_shift(clk->clksel_mask);
+
+ for (clks = clk->clksel; clks->parent && !found; clks++) {
+ for (clkr = clks->rates; clkr->div && !found; clkr++) {
+ if ((clkr->flags & cpu_mask) && (clkr->val == r)) {
+ if (clk->parent != clks->parent) {
+ pr_debug("clock: inited %s parent "
+ "to %s (was %s)\n",
+ clk->name, clks->parent->name,
+ ((clk->parent) ?
+ clk->parent->name : "NULL"));
+ clk->parent = clks->parent;
+ };
+ found = 1;
+ }
+ }
+ }
-static void omap2_followparent_recalc(struct clk *clk)
-{
- followparent_recalc(clk);
+ if (!found)
+ printk(KERN_ERR "clock: init parent: could not find "
+ "regval %0x for clock %s\n", r, clk->name);
+
+ return;
}
-static void omap2_propagate_rate(struct clk * clk)
+/* Returns the DPLL rate */
+u32 omap2_get_dpll_rate(struct clk *clk)
{
- if (!(clk->flags & RATE_FIXED))
- clk->rate = clk->parent->rate;
+ long long dpll_clk;
+ u32 dpll_mult, dpll_div, dpll;
+ const struct dpll_data *dd;
+
+ dd = clk->dpll_data;
+ /* REVISIT: What do we return on error? */
+ if (!dd)
+ return 0;
- propagate_rate(clk);
+ dpll = cm_read_reg(dd->mult_div1_reg);
+ dpll_mult = dpll & dd->mult_mask;
+ dpll_mult >>= mask_to_shift(dd->mult_mask);
+ dpll_div = dpll & dd->div1_mask;
+ dpll_div >>= mask_to_shift(dd->div1_mask);
+
+ dpll_clk = (long long)clk->parent->rate * dpll_mult;
+ do_div(dpll_clk, dpll_div + 1);
+
+ /* 34XX only */
+ if (dd->div2_reg) {
+ dpll = cm_read_reg(dd->div2_reg);
+ dpll_div = dpll & dd->div2_mask;
+ dpll_div >>= mask_to_shift(dd->div2_mask);
+ do_div(dpll_clk, dpll_div + 1);
+ }
+
+ return dpll_clk;
}
-static void omap2_set_osc_ck(int enable)
+/*
+ * Used for clocks that have the same value as the parent clock,
+ * divided by some factor
+ */
+void omap2_fixed_divisor_recalc(struct clk *clk)
{
- if (enable)
- PRCM_CLKSRC_CTRL &= ~(0x3 << 3);
- else
- PRCM_CLKSRC_CTRL |= 0x3 << 3;
+ WARN_ON(!clk->fixed_div);
+
+ clk->rate = clk->parent->rate / clk->fixed_div;
+
+ if (clk->flags & RATE_PROPAGATES)
+ propagate_rate(clk);
}
-/* Enable an APLL if off */
-static void omap2_clk_fixed_enable(struct clk *clk)
+/**
+ * omap2_wait_clock_ready - wait for clock to enable
+ * @reg: physical address of clock IDLEST register
+ * @mask: value to mask against to determine if the clock is active
+ * @name: name of the clock (for printk)
+ *
+ * Returns 1 if the clock enabled in time, or 0 if it failed to enable
+ * in roughly MAX_CLOCK_ENABLE_WAIT microseconds.
+ */
+int omap2_wait_clock_ready(void __iomem *reg, u32 mask, const char *name)
{
- u32 cval, i=0;
+ int i = 0;
+ int ena = 0;
- if (clk->enable_bit == 0xff) /* Parent will do it */
- return;
+ /*
+ * 24xx uses 0 to indicate not ready, and 1 to indicate ready.
+ * 34xx reverses this, just to keep us on our toes
+ */
+ if (cpu_mask & (RATE_IN_242X | RATE_IN_243X)) {
+ ena = mask;
+ } else if (cpu_mask & RATE_IN_343X) {
+ ena = 0;
+ }
- cval = CM_CLKEN_PLL;
+ /* Wait for lock */
+ while (((cm_read_reg(reg) & mask) != ena) &&
+ (i++ < MAX_CLOCK_ENABLE_WAIT)) {
+ udelay(1);
+ }
- if ((cval & (0x3 << clk->enable_bit)) == (0x3 << clk->enable_bit))
- return;
+ if (i < MAX_CLOCK_ENABLE_WAIT)
+ pr_debug("Clock %s stable after %d loops\n", name, i);
+ else
+ printk(KERN_ERR "Clock %s didn't enable in %d tries\n",
+ name, MAX_CLOCK_ENABLE_WAIT);
- cval &= ~(0x3 << clk->enable_bit);
- cval |= (0x3 << clk->enable_bit);
- CM_CLKEN_PLL = cval;
- if (clk == &apll96_ck)
- cval = (1 << 8);
- else if (clk == &apll54_ck)
- cval = (1 << 6);
+ return (i < MAX_CLOCK_ENABLE_WAIT) ? 1 : 0;
+};
- while (!(CM_IDLEST_CKGEN & cval)) { /* Wait for lock */
- ++i;
- udelay(1);
- if (i == 100000) {
- printk(KERN_ERR "Clock %s didn't lock\n", clk->name);
- break;
- }
- }
-}
+/*
+ * Note: We don't need special code here for INVERT_ENABLE
+ * for the time being since INVERT_ENABLE only applies to clocks enabled by
+ * CM_CLKEN_PLL
+ */
static void omap2_clk_wait_ready(struct clk *clk)
{
- unsigned long reg, other_reg, st_reg;
+ void __iomem *reg, *other_reg, *st_reg;
u32 bit;
- int i;
-
- reg = (unsigned long) clk->enable_reg;
- if (reg == (unsigned long) &CM_FCLKEN1_CORE ||
- reg == (unsigned long) &CM_FCLKEN2_CORE)
- other_reg = (reg & ~0xf0) | 0x10;
- else if (reg == (unsigned long) &CM_ICLKEN1_CORE ||
- reg == (unsigned long) &CM_ICLKEN2_CORE)
- other_reg = (reg & ~0xf0) | 0x00;
+
+ /*
+ * REVISIT: This code is pretty ugly. It would be nice to generalize
+ * it and pull it into struct clk itself somehow.
+ */
+ reg = clk->enable_reg;
+ if (reg == OMAP_CM_REGADDR(CORE_MOD, CM_FCLKEN1) ||
+ reg == OMAP_CM_REGADDR(CORE_MOD, OMAP24XX_CM_FCLKEN2))
+ other_reg = (void __iomem *)(((u32)reg & ~0xf0) | 0x10); /* CM_ICLKEN* */
+ else if (reg == OMAP_CM_REGADDR(CORE_MOD, CM_ICLKEN1) ||
+ reg == OMAP_CM_REGADDR(CORE_MOD, CM_ICLKEN2))
+ other_reg = (void __iomem *)(((u32)reg & ~0xf0) | 0x00); /* CM_FCLKEN* */
else
return;
+ /* REVISIT: What are the appropriate exclusions for 34XX? */
/* No check for DSS or cam clocks */
- if ((reg & 0x0f) == 0) {
- if (clk->enable_bit <= 1 || clk->enable_bit == 31)
+ if (cpu_is_omap24xx() && ((u32)reg & 0x0f) == 0) { /* CM_{F,I}CLKEN1 */
+ if (clk->enable_bit == OMAP24XX_EN_DSS2_SHIFT ||
+ clk->enable_bit == OMAP24XX_EN_DSS1_SHIFT ||
+ clk->enable_bit == OMAP24XX_EN_CAM_SHIFT)
return;
}
+ /* REVISIT: What are the appropriate exclusions for 34XX? */
+ /* OMAP3: ignore DSS-mod clocks */
+ if (cpu_is_omap34xx() &&
+ (((u32)reg & ~0xff) == (u32)OMAP_CM_REGADDR(OMAP3430_DSS_MOD, 0)))
+ return;
+
/* Check if both functional and interface clocks
* are running. */
bit = 1 << clk->enable_bit;
- if (!(__raw_readl(other_reg) & bit))
+ if (!(cm_read_reg(other_reg) & bit))
return;
- st_reg = (other_reg & ~0xf0) | 0x20;
- i = 0;
- while (!(__raw_readl(st_reg) & bit)) {
- i++;
- if (i == 100000) {
- printk(KERN_ERR "Timeout enabling clock %s\n", clk->name);
- break;
- }
- }
- if (i)
- pr_debug("Clock %s stable after %d loops\n", clk->name, i);
+ st_reg = (void __iomem *)(((u32)other_reg & ~0xf0) | 0x20); /* CM_IDLEST* */
+
+ omap2_wait_clock_ready(st_reg, bit, clk->name);
}
/* Enables clock without considering parent dependencies or use count
* REVISIT: Maybe change this to use clk->enable like on omap1?
*/
-static int _omap2_clk_enable(struct clk * clk)
+int _omap2_clk_enable(struct clk *clk)
{
u32 regval32;
- if (clk->flags & ALWAYS_ENABLED)
+ if (clk->flags & (ALWAYS_ENABLED | PARENT_CONTROLS_CLOCK))
return 0;
- if (unlikely(clk == &osc_ck)) {
- omap2_set_osc_ck(1);
- return 0;
- }
+ if (clk->enable)
+ return clk->enable(clk);
if (unlikely(clk->enable_reg == 0)) {
printk(KERN_ERR "clock.c: Enable for %s without enable code\n",
clk->name);
- return 0;
- }
-
- if (clk->enable_reg == (void __iomem *)&CM_CLKEN_PLL) {
- omap2_clk_fixed_enable(clk);
- return 0;
+ return 0; /* REVISIT: -EINVAL */
}
- regval32 = __raw_readl(clk->enable_reg);
- regval32 |= (1 << clk->enable_bit);
- __raw_writel(regval32, clk->enable_reg);
+ regval32 = cm_read_reg(clk->enable_reg);
+ if (clk->flags & INVERT_ENABLE)
+ regval32 &= ~(1 << clk->enable_bit);
+ else
+ regval32 |= (1 << clk->enable_bit);
+ cm_write_reg(regval32, clk->enable_reg);
wmb();
omap2_clk_wait_ready(clk);
return 0;
}
-/* Stop APLL */
-static void omap2_clk_fixed_disable(struct clk *clk)
-{
- u32 cval;
-
- if(clk->enable_bit == 0xff) /* let parent off do it */
- return;
-
- cval = CM_CLKEN_PLL;
- cval &= ~(0x3 << clk->enable_bit);
- CM_CLKEN_PLL = cval;
-}
-
/* Disables clock without considering parent dependencies or use count */
-static void _omap2_clk_disable(struct clk *clk)
+void _omap2_clk_disable(struct clk *clk)
{
u32 regval32;
- if (unlikely(clk == &osc_ck)) {
- omap2_set_osc_ck(0);
+ if (clk->flags & (ALWAYS_ENABLED | PARENT_CONTROLS_CLOCK))
return;
- }
- if (clk->enable_reg == 0)
+ if (clk->disable) {
+ clk->disable(clk);
return;
+ }
- if (clk->enable_reg == (void __iomem *)&CM_CLKEN_PLL) {
- omap2_clk_fixed_disable(clk);
+ if (clk->enable_reg == 0) {
+ /*
+ * 'Independent' here refers to a clock which is not
+ * controlled by its parent.
+ */
+ printk(KERN_ERR "clock: clk_disable called on independent "
+ "clock %s which has no enable_reg\n", clk->name);
return;
}
- regval32 = __raw_readl(clk->enable_reg);
- regval32 &= ~(1 << clk->enable_bit);
- __raw_writel(regval32, clk->enable_reg);
+ regval32 = cm_read_reg(clk->enable_reg);
+ if (clk->flags & INVERT_ENABLE)
+ regval32 |= (1 << clk->enable_bit);
+ else
+ regval32 &= ~(1 << clk->enable_bit);
+ cm_write_reg(regval32, clk->enable_reg);
wmb();
}
-static int omap2_clk_enable(struct clk *clk)
+void omap2_clk_disable(struct clk *clk)
+{
+ if (clk->usecount > 0 && !(--clk->usecount)) {
+ _omap2_clk_disable(clk);
+ if (likely((u32)clk->parent))
+ omap2_clk_disable(clk->parent);
+ }
+}
+
+int omap2_clk_enable(struct clk *clk)
{
int ret = 0;
return ret;
}
-static void omap2_clk_disable(struct clk *clk)
-{
- if (clk->usecount > 0 && !(--clk->usecount)) {
- _omap2_clk_disable(clk);
- if (likely((u32)clk->parent))
- omap2_clk_disable(clk->parent);
- }
-}
-
-/*
- * Uses the current prcm set to tell if a rate is valid.
- * You can go slower, but not faster within a given rate set.
- */
-static u32 omap2_dpll_round_rate(unsigned long target_rate)
-{
- u32 high, low;
-
- if ((CM_CLKSEL2_PLL & 0x3) == 1) { /* DPLL clockout */
- high = curr_prcm_set->dpll_speed * 2;
- low = curr_prcm_set->dpll_speed;
- } else { /* DPLL clockout x 2 */
- high = curr_prcm_set->dpll_speed;
- low = curr_prcm_set->dpll_speed / 2;
- }
-
-#ifdef DOWN_VARIABLE_DPLL
- if (target_rate > high)
- return high;
- else
- return target_rate;
-#else
- if (target_rate > low)
- return high;
- else
- return low;
-#endif
-
-}
-
/*
* Used for clocks that are part of CLKSEL_xyz governed clocks.
* REVISIT: Maybe change to use clk->enable() functions like on omap1?
*/
-static void omap2_clksel_recalc(struct clk * clk)
+void omap2_clksel_recalc(struct clk *clk)
{
- u32 fixed = 0, div = 0;
-
- if (clk == &dpll_ck) {
- clk->rate = omap2_get_dpll_rate(clk);
- fixed = 1;
- div = 0;
- }
+ u32 div = 0;
- if (clk == &iva1_mpu_int_ifck) {
- div = 2;
- fixed = 1;
- }
+ pr_debug("clock: recalc'ing clksel clk %s\n", clk->name);
- if ((clk == &dss1_fck) && ((CM_CLKSEL1_CORE & (0x1f << 8)) == 0)) {
- clk->rate = sys_ck.rate;
+ div = omap2_clksel_get_divisor(clk);
+ if (div == 0)
return;
- }
- if (!fixed) {
- div = omap2_clksel_get_divisor(clk);
- if (div == 0)
- return;
- }
+ if (unlikely(clk->rate == clk->parent->rate / div))
+ return;
+ clk->rate = clk->parent->rate / div;
- if (div != 0) {
- if (unlikely(clk->rate == clk->parent->rate / div))
- return;
- clk->rate = clk->parent->rate / div;
- }
+ pr_debug("clock: new clock rate is %ld (div %d)\n", clk->rate, div);
if (unlikely(clk->flags & RATE_PROPAGATES))
propagate_rate(clk);
}
-/*
- * Finds best divider value in an array based on the source and target
- * rates. The divider array must be sorted with smallest divider first.
+/**
+ * omap2_get_clksel_by_parent - return clksel struct for a given clk & parent
+ * @clk: OMAP struct clk ptr to inspect
+ * @src_clk: OMAP struct clk ptr of the parent clk to search for
+ *
+ * Scan the struct clksel array associated with the clock to find
+ * the element associated with the supplied parent clock address.
+ * Returns a pointer to the struct clksel on success or NULL on error.
*/
-static inline u32 omap2_divider_from_table(u32 size, u32 *div_array,
- u32 src_rate, u32 tgt_rate)
+const struct clksel *omap2_get_clksel_by_parent(struct clk *clk,
+ struct clk *src_clk)
{
- int i, test_rate;
+ const struct clksel *clks;
- if (div_array == NULL)
- return ~1;
+ if (!clk->clksel)
+ return NULL;
- for (i=0; i < size; i++) {
- test_rate = src_rate / *div_array;
- if (test_rate <= tgt_rate)
- return *div_array;
- ++div_array;
+ for (clks = clk->clksel; clks->parent; clks++) {
+ if (clks->parent == src_clk)
+ break; /* Found the requested parent */
}
- return ~0; /* No acceptable divider */
+ if (!clks->parent) {
+ printk(KERN_ERR "clock: Could not find parent clock %s in "
+ "clksel array of clock %s\n", src_clk->name,
+ clk->name);
+ return NULL;
+ }
+
+ return clks;
}
-/*
- * Find divisor for the given clock and target rate.
+/**
+ * omap2_clksel_round_rate_div - find divisor for the given clock and rate
+ * @clk: OMAP struct clk to use
+ * @target_rate: desired clock rate
+ * @new_div: ptr to where we should store the divisor
*
+ * Finds 'best' divider value in an array based on the source and target
+ * rates. The divider array must be sorted with smallest divider first.
* Note that this will not work for clocks which are part of CONFIG_PARTICIPANT,
* they are only settable as part of virtual_prcm set.
+ *
+ * Returns the rounded clock rate or returns 0xffffffff on error.
*/
-static u32 omap2_clksel_round_rate(struct clk *tclk, u32 target_rate,
- u32 *new_div)
+u32 omap2_clksel_round_rate_div(struct clk *clk, unsigned long target_rate,
+ u32 *new_div)
{
- u32 gfx_div[] = {2, 3, 4};
- u32 sysclkout_div[] = {1, 2, 4, 8, 16};
- u32 dss1_div[] = {1, 2, 3, 4, 5, 6, 8, 9, 12, 16};
- u32 vylnq_div[] = {1, 2, 3, 4, 6, 8, 9, 12, 16, 18};
- u32 best_div = ~0, asize = 0;
- u32 *div_array = NULL;
-
- switch (tclk->flags & SRC_RATE_SEL_MASK) {
- case CM_GFX_SEL1:
- asize = 3;
- div_array = gfx_div;
- break;
- case CM_PLL_SEL1:
- return omap2_dpll_round_rate(target_rate);
- case CM_SYSCLKOUT_SEL1:
- asize = 5;
- div_array = sysclkout_div;
- break;
- case CM_CORE_SEL1:
- if(tclk == &dss1_fck){
- if(tclk->parent == &core_ck){
- asize = 10;
- div_array = dss1_div;
- } else {
- *new_div = 0; /* fixed clk */
- return(tclk->parent->rate);
- }
- } else if((tclk == &vlynq_fck) && cpu_is_omap2420()){
- if(tclk->parent == &core_ck){
- asize = 10;
- div_array = vylnq_div;
- } else {
- *new_div = 0; /* fixed clk */
- return(tclk->parent->rate);
- }
- }
- break;
+ unsigned long test_rate;
+ const struct clksel *clks;
+ const struct clksel_rate *clkr;
+ u32 last_div = 0;
+
+ printk(KERN_INFO "clock: clksel_round_rate_div: %s target_rate %ld\n",
+ clk->name, target_rate);
+
+ *new_div = 1;
+
+ clks = omap2_get_clksel_by_parent(clk, clk->parent);
+ if (clks == NULL)
+ return ~0;
+
+ for (clkr = clks->rates; clkr->div; clkr++) {
+ if (!(clkr->flags & cpu_mask))
+ continue;
+
+ /* Sanity check */
+ if (clkr->div <= last_div)
+ printk(KERN_ERR "clock: clksel_rate table not sorted "
+ "for clock %s", clk->name);
+
+ last_div = clkr->div;
+
+ test_rate = clk->parent->rate / clkr->div;
+
+ if (test_rate <= target_rate)
+ break; /* found it */
}
- best_div = omap2_divider_from_table(asize, div_array,
- tclk->parent->rate, target_rate);
- if (best_div == ~0){
- *new_div = 1;
- return best_div; /* signal error */
+ if (!clkr->div) {
+ printk(KERN_ERR "clock: Could not find divisor for target "
+ "rate %ld for clock %s parent %s\n", target_rate,
+ clk->name, clk->parent->name);
+ return ~0;
}
- *new_div = best_div;
- return (tclk->parent->rate / best_div);
+ *new_div = clkr->div;
+
+ printk(KERN_INFO "clock: new_div = %d, new_rate = %ld\n", *new_div,
+ (clk->parent->rate / clkr->div));
+
+ return (clk->parent->rate / clkr->div);
}
-/* Given a clock and a rate apply a clock specific rounding function */
-static long omap2_clk_round_rate(struct clk *clk, unsigned long rate)
+/**
+ * omap2_clksel_round_rate - find rounded rate for the given clock and rate
+ * @clk: OMAP struct clk to use
+ * @target_rate: desired clock rate
+ *
+ * Compatibility wrapper for OMAP clock framework
+ * Finds best target rate based on the source clock and possible dividers.
+ * rates. The divider array must be sorted with smallest divider first.
+ * Note that this will not work for clocks which are part of CONFIG_PARTICIPANT,
+ * they are only settable as part of virtual_prcm set.
+ *
+ * Returns the rounded clock rate or returns 0xffffffff on error.
+ */
+long omap2_clksel_round_rate(struct clk *clk, unsigned long target_rate)
{
- u32 new_div = 0;
- int valid_rate;
+ u32 new_div;
- if (clk->flags & RATE_FIXED)
- return clk->rate;
+ return omap2_clksel_round_rate_div(clk, target_rate, &new_div);
+}
- if (clk->flags & RATE_CKCTL) {
- valid_rate = omap2_clksel_round_rate(clk, rate, &new_div);
- return valid_rate;
- }
+/* Given a clock and a rate apply a clock specific rounding function */
+long omap2_clk_round_rate(struct clk *clk, unsigned long rate)
+{
if (clk->round_rate != 0)
return clk->round_rate(clk, rate);
+ if (clk->flags & RATE_FIXED)
+ printk(KERN_ERR "clock: generic omap2_clk_round_rate called "
+ "on fixed-rate clock %s\n", clk->name);
+
return clk->rate;
}
-/*
- * Check the DLL lock state, and return tue if running in unlock mode.
- * This is needed to compensate for the shifted DLL value in unlock mode.
+/**
+ * omap2_clksel_to_divisor() - turn clksel field value into integer divider
+ * @clk: OMAP struct clk to use
+ * @field_val: register field value to find
+ *
+ * Given a struct clk of a rate-selectable clksel clock, and a register field
+ * value to search for, find the corresponding clock divisor. The register
+ * field value should be pre-masked and shifted down so the LSB is at bit 0
+ * before calling. Returns 0 on error
*/
-static u32 omap2_dll_force_needed(void)
+u32 omap2_clksel_to_divisor(struct clk *clk, u32 field_val)
{
- u32 dll_state = SDRC_DLLA_CTRL; /* dlla and dllb are a set */
+ const struct clksel *clks;
+ const struct clksel_rate *clkr;
- if ((dll_state & (1 << 2)) == (1 << 2))
- return 1;
- else
+ clks = omap2_get_clksel_by_parent(clk, clk->parent);
+ if (clks == NULL)
return 0;
-}
-static u32 omap2_reprogram_sdrc(u32 level, u32 force)
-{
- u32 slow_dll_ctrl, fast_dll_ctrl, m_type;
- u32 prev = curr_perf_level, flags;
-
- if ((curr_perf_level == level) && !force)
- return prev;
-
- m_type = omap2_memory_get_type();
- slow_dll_ctrl = omap2_memory_get_slow_dll_ctrl();
- fast_dll_ctrl = omap2_memory_get_fast_dll_ctrl();
-
- if (level == PRCM_HALF_SPEED) {
- local_irq_save(flags);
- PRCM_VOLTSETUP = 0xffff;
- omap2_sram_reprogram_sdrc(PRCM_HALF_SPEED,
- slow_dll_ctrl, m_type);
- curr_perf_level = PRCM_HALF_SPEED;
- local_irq_restore(flags);
+ for (clkr = clks->rates; clkr->div; clkr++) {
+ if ((clkr->flags & cpu_mask) && (clkr->val == field_val))
+ break;
}
- if (level == PRCM_FULL_SPEED) {
- local_irq_save(flags);
- PRCM_VOLTSETUP = 0xffff;
- omap2_sram_reprogram_sdrc(PRCM_FULL_SPEED,
- fast_dll_ctrl, m_type);
- curr_perf_level = PRCM_FULL_SPEED;
- local_irq_restore(flags);
+
+ if (!clkr->div) {
+ printk(KERN_ERR "clock: Could not find fieldval %d for "
+ "clock %s parent %s\n", field_val, clk->name,
+ clk->parent->name);
+ return 0;
}
- return prev;
+ return clkr->div;
}
-static int omap2_reprogram_dpll(struct clk * clk, unsigned long rate)
+/**
+ * omap2_divisor_to_clksel() - turn clksel integer divisor into a field value
+ * @clk: OMAP struct clk to use
+ * @div: integer divisor to search for
+ *
+ * Given a struct clk of a rate-selectable clksel clock, and a clock divisor,
+ * find the corresponding register field value. The return register value is
+ * the value before left-shifting. Returns 0xffffffff on error
+ */
+u32 omap2_divisor_to_clksel(struct clk *clk, u32 div)
{
- u32 flags, cur_rate, low, mult, div, valid_rate, done_rate;
- u32 bypass = 0;
- struct prcm_config tmpset;
- int ret = -EINVAL;
-
- local_irq_save(flags);
- cur_rate = omap2_get_dpll_rate(&dpll_ck);
- mult = CM_CLKSEL2_PLL & 0x3;
-
- if ((rate == (cur_rate / 2)) && (mult == 2)) {
- omap2_reprogram_sdrc(PRCM_HALF_SPEED, 1);
- } else if ((rate == (cur_rate * 2)) && (mult == 1)) {
- omap2_reprogram_sdrc(PRCM_FULL_SPEED, 1);
- } else if (rate != cur_rate) {
- valid_rate = omap2_dpll_round_rate(rate);
- if (valid_rate != rate)
- goto dpll_exit;
-
- if ((CM_CLKSEL2_PLL & 0x3) == 1)
- low = curr_prcm_set->dpll_speed;
- else
- low = curr_prcm_set->dpll_speed / 2;
-
- tmpset.cm_clksel1_pll = CM_CLKSEL1_PLL;
- tmpset.cm_clksel1_pll &= ~(0x3FFF << 8);
- div = ((curr_prcm_set->xtal_speed / 1000000) - 1);
- tmpset.cm_clksel2_pll = CM_CLKSEL2_PLL;
- tmpset.cm_clksel2_pll &= ~0x3;
- if (rate > low) {
- tmpset.cm_clksel2_pll |= 0x2;
- mult = ((rate / 2) / 1000000);
- done_rate = PRCM_FULL_SPEED;
- } else {
- tmpset.cm_clksel2_pll |= 0x1;
- mult = (rate / 1000000);
- done_rate = PRCM_HALF_SPEED;
- }
- tmpset.cm_clksel1_pll |= ((div << 8) | (mult << 12));
-
- /* Worst case */
- tmpset.base_sdrc_rfr = V24XX_SDRC_RFR_CTRL_BYPASS;
-
- if (rate == curr_prcm_set->xtal_speed) /* If asking for 1-1 */
- bypass = 1;
+ const struct clksel *clks;
+ const struct clksel_rate *clkr;
- omap2_reprogram_sdrc(PRCM_FULL_SPEED, 1); /* For init_mem */
+ /* should never happen */
+ WARN_ON(div == 0);
- /* Force dll lock mode */
- omap2_set_prcm(tmpset.cm_clksel1_pll, tmpset.base_sdrc_rfr,
- bypass);
+ clks = omap2_get_clksel_by_parent(clk, clk->parent);
+ if (clks == NULL)
+ return 0;
- /* Errata: ret dll entry state */
- omap2_init_memory_params(omap2_dll_force_needed());
- omap2_reprogram_sdrc(done_rate, 0);
+ for (clkr = clks->rates; clkr->div; clkr++) {
+ if ((clkr->flags & cpu_mask) && (clkr->div == div))
+ break;
}
- omap2_clksel_recalc(&dpll_ck);
- ret = 0;
-dpll_exit:
- local_irq_restore(flags);
- return(ret);
-}
+ if (!clkr->div) {
+ printk(KERN_ERR "clock: Could not find divisor %d for "
+ "clock %s parent %s\n", div, clk->name,
+ clk->parent->name);
+ return 0;
+ }
-/* Just return the MPU speed */
-static void omap2_mpu_recalc(struct clk * clk)
-{
- clk->rate = curr_prcm_set->mpu_speed;
+ return clkr->val;
}
-/*
- * Look for a rate equal or less than the target rate given a configuration set.
+/**
+ * omap2_get_clksel - find clksel register addr & field mask for a clk
+ * @clk: struct clk to use
+ * @field_mask: ptr to u32 to store the register field mask
*
- * What's not entirely clear is "which" field represents the key field.
- * Some might argue L3-DDR, others ARM, others IVA. This code is simple and
- * just uses the ARM rates.
+ * Returns the address of the clksel register upon success or NULL on error.
*/
-static long omap2_round_to_table_rate(struct clk * clk, unsigned long rate)
+void __iomem *omap2_get_clksel(struct clk *clk, u32 *field_mask)
{
- struct prcm_config * ptr;
- long highest_rate;
-
- if (clk != &virt_prcm_set)
- return -EINVAL;
-
- highest_rate = -EINVAL;
+ if (unlikely((clk->clksel_reg == 0) || (clk->clksel_mask == 0)))
+ return NULL;
- for (ptr = rate_table; ptr->mpu_speed; ptr++) {
- if (ptr->xtal_speed != sys_ck.rate)
- continue;
+ *field_mask = clk->clksel_mask;
- highest_rate = ptr->mpu_speed;
-
- /* Can check only after xtal frequency check */
- if (ptr->mpu_speed <= rate)
- break;
- }
- return highest_rate;
+ return clk->clksel_reg;
}
-/*
- * omap2_convert_field_to_div() - turn field value into integer divider
+/**
+ * omap2_clksel_get_divisor - get current divider applied to parent clock.
+ * @clk: OMAP struct clk to use.
+ *
+ * Returns the integer divisor upon success or 0 on error.
*/
-static u32 omap2_clksel_to_divisor(u32 div_sel, u32 field_val)
+u32 omap2_clksel_get_divisor(struct clk *clk)
{
- u32 i;
- u32 clkout_array[] = {1, 2, 4, 8, 16};
+ u32 field_mask, field_val;
+ void __iomem *div_addr;
- if ((div_sel & SRC_RATE_SEL_MASK) == CM_SYSCLKOUT_SEL1) {
- for (i = 0; i < 5; i++) {
- if (field_val == i)
- return clkout_array[i];
- }
- return ~0;
- } else
- return field_val;
+ div_addr = omap2_get_clksel(clk, &field_mask);
+ if (div_addr == 0)
+ return 0;
+
+ field_val = cm_read_reg(div_addr) & field_mask;
+ field_val >>= mask_to_shift(field_mask);
+
+ return omap2_clksel_to_divisor(clk, field_val);
}
-/*
- * Returns the CLKSEL divider register value
- * REVISIT: This should be cleaned up to work nicely with void __iomem *
- */
-static u32 omap2_get_clksel(u32 *div_sel, u32 *field_mask,
- struct clk *clk)
+int omap2_clksel_set_rate(struct clk *clk, unsigned long rate)
{
- int ret = ~0;
- u32 reg_val, div_off;
- u32 div_addr = 0;
- u32 mask = ~0;
-
- div_off = clk->rate_offset;
-
- switch ((*div_sel & SRC_RATE_SEL_MASK)) {
- case CM_MPU_SEL1:
- div_addr = (u32)&CM_CLKSEL_MPU;
- mask = 0x1f;
- break;
- case CM_DSP_SEL1:
- div_addr = (u32)&CM_CLKSEL_DSP;
- if (cpu_is_omap2420()) {
- if ((div_off == 0) || (div_off == 8))
- mask = 0x1f;
- else if (div_off == 5)
- mask = 0x3;
- } else if (cpu_is_omap2430()) {
- if (div_off == 0)
- mask = 0x1f;
- else if (div_off == 5)
- mask = 0x3;
- }
- break;
- case CM_GFX_SEL1:
- div_addr = (u32)&CM_CLKSEL_GFX;
- if (div_off == 0)
- mask = 0x7;
- break;
- case CM_MODEM_SEL1:
- div_addr = (u32)&CM_CLKSEL_MDM;
- if (div_off == 0)
- mask = 0xf;
- break;
- case CM_SYSCLKOUT_SEL1:
- div_addr = (u32)&PRCM_CLKOUT_CTRL;
- if ((div_off == 3) || (div_off == 11))
- mask= 0x3;
- break;
- case CM_CORE_SEL1:
- div_addr = (u32)&CM_CLKSEL1_CORE;
- switch (div_off) {
- case 0: /* l3 */
- case 8: /* dss1 */
- case 15: /* vylnc-2420 */
- case 20: /* ssi */
- mask = 0x1f; break;
- case 5: /* l4 */
- mask = 0x3; break;
- case 13: /* dss2 */
- mask = 0x1; break;
- case 25: /* usb */
- mask = 0x7; break;
- }
- }
+ u32 field_mask, field_val, reg_val, validrate, new_div = 0;
+ void __iomem *div_addr;
- *field_mask = mask;
+ validrate = omap2_clksel_round_rate_div(clk, rate, &new_div);
+ if (validrate != rate)
+ return -EINVAL;
- if (unlikely(mask == ~0))
- div_addr = 0;
+ div_addr = omap2_get_clksel(clk, &field_mask);
+ if (div_addr == 0)
+ return -EINVAL;
- *div_sel = div_addr;
+ field_val = omap2_divisor_to_clksel(clk, new_div);
+ if (field_val == ~0)
+ return -EINVAL;
- if (unlikely(div_addr == 0))
- return ret;
+ reg_val = cm_read_reg(div_addr);
+ reg_val &= ~field_mask;
+ reg_val |= (field_val << mask_to_shift(field_mask));
+ cm_write_reg(reg_val, div_addr);
+ wmb();
- /* Isolate field */
- reg_val = __raw_readl((void __iomem *)div_addr) & (mask << div_off);
+ clk->rate = clk->parent->rate / new_div;
- /* Normalize back to divider value */
- reg_val >>= div_off;
+ if (clk->flags & DELAYED_APP && cpu_is_omap24xx()) {
+ prm_write_reg(OMAP24XX_VALID_CONFIG, OMAP24XX_PRCM_CLKCFG_CTRL);
+ wmb();
+ }
- return reg_val;
+ return 0;
}
-/*
- * Return divider to be applied to parent clock.
- * Return 0 on error.
- */
-static u32 omap2_clksel_get_divisor(struct clk *clk)
-{
- int ret = 0;
- u32 div, div_sel, div_off, field_mask, field_val;
-
- /* isolate control register */
- div_sel = (SRC_RATE_SEL_MASK & clk->flags);
-
- div_off = clk->rate_offset;
- field_val = omap2_get_clksel(&div_sel, &field_mask, clk);
- if (div_sel == 0)
- return ret;
-
- div_sel = (SRC_RATE_SEL_MASK & clk->flags);
- div = omap2_clksel_to_divisor(div_sel, field_val);
-
- return div;
-}
/* Set the clock rate for a clock source */
-static int omap2_clk_set_rate(struct clk *clk, unsigned long rate)
-
+int omap2_clk_set_rate(struct clk *clk, unsigned long rate)
{
int ret = -EINVAL;
- void __iomem * reg;
- u32 div_sel, div_off, field_mask, field_val, reg_val, validrate;
- u32 new_div = 0;
-
- if (!(clk->flags & CONFIG_PARTICIPANT) && (clk->flags & RATE_CKCTL)) {
- if (clk == &dpll_ck)
- return omap2_reprogram_dpll(clk, rate);
-
- /* Isolate control register */
- div_sel = (SRC_RATE_SEL_MASK & clk->flags);
- div_off = clk->rate_offset;
-
- validrate = omap2_clksel_round_rate(clk, rate, &new_div);
- if (validrate != rate)
- return(ret);
- field_val = omap2_get_clksel(&div_sel, &field_mask, clk);
- if (div_sel == 0)
- return ret;
-
- if (clk->flags & CM_SYSCLKOUT_SEL1) {
- switch (new_div) {
- case 16:
- field_val = 4;
- break;
- case 8:
- field_val = 3;
- break;
- case 4:
- field_val = 2;
- break;
- case 2:
- field_val = 1;
- break;
- case 1:
- field_val = 0;
- break;
- }
- } else
- field_val = new_div;
+ pr_debug("clock: set_rate for clock %s to rate %ld\n", clk->name, rate);
- reg = (void __iomem *)div_sel;
-
- reg_val = __raw_readl(reg);
- reg_val &= ~(field_mask << div_off);
- reg_val |= (field_val << div_off);
- __raw_writel(reg_val, reg);
- wmb();
- clk->rate = clk->parent->rate / field_val;
+ /* CONFIG_PARTICIPANT clocks are changed only in sets via the
+ rate table mechanism, driven by mpu_speed */
+ if (clk->flags & CONFIG_PARTICIPANT)
+ return -EINVAL;
- if (clk->flags & DELAYED_APP) {
- __raw_writel(0x1, (void __iomem *)&PRCM_CLKCFG_CTRL);
- wmb();
- }
- ret = 0;
- } else if (clk->set_rate != 0)
+ /* dpll_ck, core_ck, virt_prcm_set; plus all clksel clocks */
+ if (clk->set_rate != 0)
ret = clk->set_rate(clk, rate);
if (unlikely(ret == 0 && (clk->flags & RATE_PROPAGATES)))
return ret;
}
-/* Converts encoded control register address into a full address */
-static u32 omap2_get_src_field(u32 *type_to_addr, u32 reg_offset,
- struct clk *src_clk, u32 *field_mask)
-{
- u32 val = ~0, src_reg_addr = 0, mask = 0;
-
- /* Find target control register.*/
- switch ((*type_to_addr & SRC_RATE_SEL_MASK)) {
- case CM_CORE_SEL1:
- src_reg_addr = (u32)&CM_CLKSEL1_CORE;
- if (reg_offset == 13) { /* DSS2_fclk */
- mask = 0x1;
- if (src_clk == &sys_ck)
- val = 0;
- if (src_clk == &func_48m_ck)
- val = 1;
- } else if (reg_offset == 8) { /* DSS1_fclk */
- mask = 0x1f;
- if (src_clk == &sys_ck)
- val = 0;
- else if (src_clk == &core_ck) /* divided clock */
- val = 0x10; /* rate needs fixing */
- } else if ((reg_offset == 15) && cpu_is_omap2420()){ /*vlnyq*/
- mask = 0x1F;
- if(src_clk == &func_96m_ck)
- val = 0;
- else if (src_clk == &core_ck)
- val = 0x10;
- }
- break;
- case CM_CORE_SEL2:
- src_reg_addr = (u32)&CM_CLKSEL2_CORE;
- mask = 0x3;
- if (src_clk == &func_32k_ck)
- val = 0x0;
- if (src_clk == &sys_ck)
- val = 0x1;
- if (src_clk == &alt_ck)
- val = 0x2;
- break;
- case CM_WKUP_SEL1:
- src_reg_addr = (u32)&CM_CLKSEL_WKUP;
- mask = 0x3;
- if (src_clk == &func_32k_ck)
- val = 0x0;
- if (src_clk == &sys_ck)
- val = 0x1;
- if (src_clk == &alt_ck)
- val = 0x2;
- break;
- case CM_PLL_SEL1:
- src_reg_addr = (u32)&CM_CLKSEL1_PLL;
- mask = 0x1;
- if (reg_offset == 0x3) {
- if (src_clk == &apll96_ck)
- val = 0;
- if (src_clk == &alt_ck)
- val = 1;
- }
- else if (reg_offset == 0x5) {
- if (src_clk == &apll54_ck)
- val = 0;
- if (src_clk == &alt_ck)
- val = 1;
- }
- break;
- case CM_PLL_SEL2:
- src_reg_addr = (u32)&CM_CLKSEL2_PLL;
- mask = 0x3;
- if (src_clk == &func_32k_ck)
- val = 0x0;
- if (src_clk == &dpll_ck)
- val = 0x2;
- break;
- case CM_SYSCLKOUT_SEL1:
- src_reg_addr = (u32)&PRCM_CLKOUT_CTRL;
- mask = 0x3;
- if (src_clk == &dpll_ck)
- val = 0;
- if (src_clk == &sys_ck)
- val = 1;
- if (src_clk == &func_96m_ck)
- val = 2;
- if (src_clk == &func_54m_ck)
- val = 3;
- break;
- }
-
- if (val == ~0) /* Catch errors in offset */
- *type_to_addr = 0;
- else
- *type_to_addr = src_reg_addr;
- *field_mask = mask;
-
- return val;
-}
-
-static int omap2_clk_set_parent(struct clk *clk, struct clk *new_parent)
+/*
+ * Converts encoded control register address into a full address
+ * On error, *src_addr will be returned as 0.
+ */
+static u32 omap2_clksel_get_src_field(void __iomem **src_addr,
+ struct clk *src_clk, u32 *field_mask,
+ struct clk *clk, u32 *parent_div)
{
- void __iomem * reg;
- u32 src_sel, src_off, field_val, field_mask, reg_val, rate;
- int ret = -EINVAL;
+ const struct clksel *clks;
+ const struct clksel_rate *clkr;
- if (unlikely(clk->flags & CONFIG_PARTICIPANT))
- return ret;
-
- if (clk->flags & SRC_SEL_MASK) { /* On-chip SEL collection */
- src_sel = (SRC_RATE_SEL_MASK & clk->flags);
- src_off = clk->src_offset;
-
- if (src_sel == 0)
- goto set_parent_error;
-
- field_val = omap2_get_src_field(&src_sel, src_off, new_parent,
- &field_mask);
-
- reg = (void __iomem *)src_sel;
+ *parent_div = 0;
+ *src_addr = 0;
- if (clk->usecount > 0)
- _omap2_clk_disable(clk);
-
- /* Set new source value (previous dividers if any in effect) */
- reg_val = __raw_readl(reg) & ~(field_mask << src_off);
- reg_val |= (field_val << src_off);
- __raw_writel(reg_val, reg);
- wmb();
-
- if (clk->flags & DELAYED_APP) {
- __raw_writel(0x1, (void __iomem *)&PRCM_CLKCFG_CTRL);
- wmb();
- }
- if (clk->usecount > 0)
- _omap2_clk_enable(clk);
-
- clk->parent = new_parent;
-
- /* SRC_RATE_SEL_MASK clocks follow their parents rates.*/
- if ((new_parent == &core_ck) && (clk == &dss1_fck))
- clk->rate = new_parent->rate / 0x10;
- else
- clk->rate = new_parent->rate;
+ clks = omap2_get_clksel_by_parent(clk, src_clk);
+ if (clks == NULL)
+ return 0;
- if (unlikely(clk->flags & RATE_PROPAGATES))
- propagate_rate(clk);
+ for (clkr = clks->rates; clkr->div; clkr++) {
+ if (clkr->flags & (cpu_mask | DEFAULT_RATE))
+ break; /* Found the default rate for this platform */
+ }
+ if (!clkr->div) {
+ printk(KERN_ERR "clock: Could not find default rate for "
+ "clock %s parent %s\n", clk->name,
+ src_clk->parent->name);
return 0;
- } else {
- clk->parent = new_parent;
- rate = new_parent->rate;
- omap2_clk_set_rate(clk, rate);
- ret = 0;
}
- set_parent_error:
- return ret;
+ /* Should never happen. Add a clksel mask to the struct clk. */
+ WARN_ON(clk->clksel_mask == 0);
+
+ *field_mask = clk->clksel_mask;
+ *src_addr = clk->clksel_reg;
+ *parent_div = clkr->div;
+
+ return clkr->val;
}
-/* Sets basic clocks based on the specified rate */
-static int omap2_select_table_rate(struct clk * clk, unsigned long rate)
+int omap2_clk_set_parent(struct clk *clk, struct clk *new_parent)
{
- u32 flags, cur_rate, done_rate, bypass = 0;
- u8 cpu_mask = 0;
- struct prcm_config *prcm;
- unsigned long found_speed = 0;
+ void __iomem *src_addr;
+ u32 field_val, field_mask, reg_val, parent_div;
- if (clk != &virt_prcm_set)
+ if (unlikely(clk->flags & CONFIG_PARTICIPANT))
return -EINVAL;
- /* FIXME: Change cpu_is_omap2420() to cpu_is_omap242x() */
- if (cpu_is_omap2420())
- cpu_mask = RATE_IN_242X;
- else if (cpu_is_omap2430())
- cpu_mask = RATE_IN_243X;
-
- for (prcm = rate_table; prcm->mpu_speed; prcm++) {
- if (!(prcm->flags & cpu_mask))
- continue;
-
- if (prcm->xtal_speed != sys_ck.rate)
- continue;
-
- if (prcm->mpu_speed <= rate) {
- found_speed = prcm->mpu_speed;
- break;
- }
- }
-
- if (!found_speed) {
- printk(KERN_INFO "Could not set MPU rate to %luMHz\n",
- rate / 1000000);
+ if (!clk->clksel)
return -EINVAL;
- }
-
- curr_prcm_set = prcm;
- cur_rate = omap2_get_dpll_rate(&dpll_ck);
-
- if (prcm->dpll_speed == cur_rate / 2) {
- omap2_reprogram_sdrc(PRCM_HALF_SPEED, 1);
- } else if (prcm->dpll_speed == cur_rate * 2) {
- omap2_reprogram_sdrc(PRCM_FULL_SPEED, 1);
- } else if (prcm->dpll_speed != cur_rate) {
- local_irq_save(flags);
- if (prcm->dpll_speed == prcm->xtal_speed)
- bypass = 1;
+ field_val = omap2_clksel_get_src_field(&src_addr, new_parent,
+ &field_mask, clk, &parent_div);
+ if (src_addr == 0)
+ return -EINVAL;
- if ((prcm->cm_clksel2_pll & 0x3) == 2)
- done_rate = PRCM_FULL_SPEED;
- else
- done_rate = PRCM_HALF_SPEED;
+ if (clk->usecount > 0)
+ _omap2_clk_disable(clk);
- /* MPU divider */
- CM_CLKSEL_MPU = prcm->cm_clksel_mpu;
+ /* Set new source value (previous dividers if any in effect) */
+ reg_val = __raw_readl(src_addr) & ~field_mask;
+ reg_val |= (field_val << mask_to_shift(field_mask));
+ __raw_writel(reg_val, src_addr);
+ wmb();
- /* dsp + iva1 div(2420), iva2.1(2430) */
- CM_CLKSEL_DSP = prcm->cm_clksel_dsp;
+ if (clk->flags & DELAYED_APP && cpu_is_omap24xx()) {
+ prm_write_reg(OMAP24XX_VALID_CONFIG,
+ OMAP24XX_PRCM_CLKCFG_CTRL);
+ wmb();
+ }
- CM_CLKSEL_GFX = prcm->cm_clksel_gfx;
+ if (clk->usecount > 0)
+ _omap2_clk_enable(clk);
- /* Major subsystem dividers */
- CM_CLKSEL1_CORE = prcm->cm_clksel1_core;
- if (cpu_is_omap2430())
- CM_CLKSEL_MDM = prcm->cm_clksel_mdm;
+ clk->parent = new_parent;
- /* x2 to enter init_mem */
- omap2_reprogram_sdrc(PRCM_FULL_SPEED, 1);
+ /* CLKSEL clocks follow their parents' rates, divided by a divisor */
+ clk->rate = new_parent->rate;
- omap2_set_prcm(prcm->cm_clksel1_pll, prcm->base_sdrc_rfr,
- bypass);
+ if (parent_div > 0)
+ clk->rate /= parent_div;
- omap2_init_memory_params(omap2_dll_force_needed());
- omap2_reprogram_sdrc(done_rate, 0);
+ pr_debug("clock: set parent of %s to %s (new rate %ld)\n",
+ clk->name, clk->parent->name, clk->rate);
- local_irq_restore(flags);
- }
- omap2_clksel_recalc(&dpll_ck);
+ if (unlikely(clk->flags & RATE_PROPAGATES))
+ propagate_rate(clk);
return 0;
}
*-------------------------------------------------------------------------*/
#ifdef CONFIG_OMAP_RESET_CLOCKS
-static void __init omap2_clk_disable_unused(struct clk *clk)
+void omap2_clk_disable_unused(struct clk *clk)
{
- u32 regval32;
+ u32 regval32, v;
+
+ v = (clk->flags & INVERT_ENABLE) ? (1 << clk->enable_bit) : 0;
- regval32 = __raw_readl(clk->enable_reg);
- if ((regval32 & (1 << clk->enable_bit)) == 0)
+ regval32 = cm_read_reg(clk->enable_reg);
+ if ((regval32 & (1 << clk->enable_bit)) == v)
return;
printk(KERN_INFO "Disabling unused clock \"%s\"\n", clk->name);
_omap2_clk_disable(clk);
}
-#else
-#define omap2_clk_disable_unused NULL
#endif
-
-static struct clk_functions omap2_clk_functions = {
- .clk_enable = omap2_clk_enable,
- .clk_disable = omap2_clk_disable,
- .clk_round_rate = omap2_clk_round_rate,
- .clk_set_rate = omap2_clk_set_rate,
- .clk_set_parent = omap2_clk_set_parent,
- .clk_disable_unused = omap2_clk_disable_unused,
-};
-
-static void __init omap2_get_crystal_rate(struct clk *osc, struct clk *sys)
-{
- u32 div, aplls, sclk = 13000000;
-
- aplls = CM_CLKSEL1_PLL;
- aplls &= ((1 << 23) | (1 << 24) | (1 << 25));
- aplls >>= 23; /* Isolate field, 0,2,3 */
-
- if (aplls == 0)
- sclk = 19200000;
- else if (aplls == 2)
- sclk = 13000000;
- else if (aplls == 3)
- sclk = 12000000;
-
- div = PRCM_CLKSRC_CTRL;
- div &= ((1 << 7) | (1 << 6));
- div >>= sys->rate_offset;
-
- osc->rate = sclk * div;
- sys->rate = sclk;
-}
-
-/*
- * Set clocks for bypass mode for reboot to work.
- */
-void omap2_clk_prepare_for_reboot(void)
-{
- u32 rate;
-
- if (vclk == NULL || sclk == NULL)
- return;
-
- rate = clk_get_rate(sclk);
- clk_set_rate(vclk, rate);
-}
-
-/*
- * Switch the MPU rate if specified on cmdline.
- * We cannot do this early until cmdline is parsed.
- */
-static int __init omap2_clk_arch_init(void)
-{
- if (!mpurate)
- return -EINVAL;
-
- if (omap2_select_table_rate(&virt_prcm_set, mpurate))
- printk(KERN_ERR "Could not find matching MPU rate\n");
-
- propagate_rate(&osc_ck); /* update main root fast */
- propagate_rate(&func_32k_ck); /* update main root slow */
-
- printk(KERN_INFO "Switched to new clocking rate (Crystal/DPLL/MPU): "
- "%ld.%01ld/%ld/%ld MHz\n",
- (sys_ck.rate / 1000000), (sys_ck.rate / 100000) % 10,
- (dpll_ck.rate / 1000000), (mpu_ck.rate / 1000000)) ;
-
- return 0;
-}
-arch_initcall(omap2_clk_arch_init);
-
-int __init omap2_clk_init(void)
-{
- struct prcm_config *prcm;
- struct clk ** clkp;
- u32 clkrate;
-
- clk_init(&omap2_clk_functions);
- omap2_get_crystal_rate(&osc_ck, &sys_ck);
-
- for (clkp = onchip_clks; clkp < onchip_clks + ARRAY_SIZE(onchip_clks);
- clkp++) {
-
- if ((*clkp)->flags & CLOCK_IN_OMAP242X && cpu_is_omap2420()) {
- clk_register(*clkp);
- continue;
- }
-
- if ((*clkp)->flags & CLOCK_IN_OMAP243X && cpu_is_omap2430()) {
- clk_register(*clkp);
- continue;
- }
- }
-
- /* Check the MPU rate set by bootloader */
- clkrate = omap2_get_dpll_rate(&dpll_ck);
- for (prcm = rate_table; prcm->mpu_speed; prcm++) {
- if (prcm->xtal_speed != sys_ck.rate)
- continue;
- if (prcm->dpll_speed <= clkrate)
- break;
- }
- curr_prcm_set = prcm;
-
- propagate_rate(&osc_ck); /* update main root fast */
- propagate_rate(&func_32k_ck); /* update main root slow */
-
- printk(KERN_INFO "Clocking rate (Crystal/DPLL/MPU): "
- "%ld.%01ld/%ld/%ld MHz\n",
- (sys_ck.rate / 1000000), (sys_ck.rate / 100000) % 10,
- (dpll_ck.rate / 1000000), (mpu_ck.rate / 1000000)) ;
-
- /*
- * Only enable those clocks we will need, let the drivers
- * enable other clocks as necessary
- */
- clk_enable(&sync_32k_ick);
- clk_enable(&omapctrl_ick);
-
- /* Force the APLLs always active. The clocks are idled
- * automatically by hardware. */
- clk_enable(&apll96_ck);
- clk_enable(&apll54_ck);
-
- if (cpu_is_omap2430())
- clk_enable(&sdrc_ick);
-
- /* Avoid sleeping sleeping during omap2_clk_prepare_for_reboot() */
- vclk = clk_get(NULL, "virt_prcm_set");
- sclk = clk_get(NULL, "sys_ck");
-
- return 0;
-}
projects / linux-2.6-omap-h63xx.git / blobdiff