diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-omap2/Makefile | 3 | ||||
| -rw-r--r-- | arch/arm/mach-omap2/clkt_clksel.c | 417 | ||||
| -rw-r--r-- | arch/arm/mach-omap2/clock.c | 377 | ||||
| -rw-r--r-- | arch/arm/mach-omap2/clock.h | 2 |
4 files changed, 424 insertions, 375 deletions
diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile index 1a135c8e7f1e..9ecc58d2c986 100644 --- a/arch/arm/mach-omap2/Makefile +++ b/arch/arm/mach-omap2/Makefile @@ -9,7 +9,8 @@ omap-2-3-common = irq.o sdrc.o omap_hwmod.o omap-3-4-common = dpll3xxx.o prcm-common = prcm.o powerdomain.o clock-common = clock.o clock_common_data.o \ - clockdomain.o clkt_dpll.o + clockdomain.o clkt_dpll.o \ + clkt_clksel.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) \ diff --git a/arch/arm/mach-omap2/clkt_clksel.c b/arch/arm/mach-omap2/clkt_clksel.c new file mode 100644 index 000000000000..25a2363106de --- /dev/null +++ b/arch/arm/mach-omap2/clkt_clksel.c @@ -0,0 +1,417 @@ +/* + * clkt_clksel.c - OMAP2/3/4 clksel clock functions + * + * Copyright (C) 2005-2008 Texas Instruments, Inc. + * Copyright (C) 2004-2010 Nokia Corporation + * + * Contacts: + * Richard Woodruff <r-woodruff2@ti.com> + * Paul Walmsley + * + * 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. + * + * XXX At some point these clksel clocks should be split into + * "divider" clocks and "mux" clocks to better match the hardware. + * + * XXX Currently these clocks are only used in the OMAP2/3/4 code, but + * many of the OMAP1 clocks should be convertible to use this + * mechanism. + */ +#undef DEBUG + +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/clk.h> +#include <linux/io.h> + +#include <plat/clock.h> + +#include "clock.h" +#include "cm.h" +#include "cm-regbits-24xx.h" +#include "cm-regbits-34xx.h" + +/* Private functions */ + +/** + * _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 const struct clksel *_omap2_get_clksel_by_parent(struct clk *clk, + struct clk *src_clk) +{ + const struct clksel *clks; + + if (!clk->clksel) + return NULL; + + for (clks = clk->clksel; clks->parent; clks++) { + if (clks->parent == src_clk) + break; /* Found the requested parent */ + } + + 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; +} + +/* + * Converts encoded control register address into a full address + * On error, the return value (parent_div) will be 0. + */ +static u32 _omap2_clksel_get_src_field(struct clk *src_clk, struct clk *clk, + u32 *field_val) +{ + const struct clksel *clks; + const struct clksel_rate *clkr; + + clks = _omap2_get_clksel_by_parent(clk, src_clk); + if (!clks) + return 0; + + for (clkr = clks->rates; clkr->div; clkr++) { + if (clkr->flags & cpu_mask && clkr->flags & 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; + } + + /* Should never happen. Add a clksel mask to the struct clk. */ + WARN_ON(clk->clksel_mask == 0); + + *field_val = clkr->val; + + return clkr->div; +} + + +/* Public functions */ + +/** + * 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) +{ + const struct clksel *clks; + const struct clksel_rate *clkr; + u32 r, found = 0; + + if (!clk->clksel) + return; + + r = __raw_readl(clk->clksel_reg) & clk->clksel_mask; + r >>= __ffs(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_reparent(clk, clks->parent); + }; + found = 1; + } + } + } + + if (!found) + printk(KERN_ERR "clock: init parent: could not find " + "regval %0x for clock %s\n", r, clk->name); + + return; +} + +/* + * Used for clocks that are part of CLKSEL_xyz governed clocks. + * REVISIT: Maybe change to use clk->enable() functions like on omap1? + */ +unsigned long omap2_clksel_recalc(struct clk *clk) +{ + unsigned long rate; + u32 div = 0; + + pr_debug("clock: recalc'ing clksel clk %s\n", clk->name); + + div = omap2_clksel_get_divisor(clk); + if (div == 0) + return clk->rate; + + rate = clk->parent->rate / div; + + pr_debug("clock: new clock rate is %ld (div %d)\n", rate, div); + + return 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. + */ +u32 omap2_clksel_round_rate_div(struct clk *clk, unsigned long target_rate, + u32 *new_div) +{ + unsigned long test_rate; + const struct clksel *clks; + const struct clksel_rate *clkr; + u32 last_div = 0; + + pr_debug("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) + return ~0; + + for (clkr = clks->rates; clkr->div; clkr++) { + if (!(clkr->flags & cpu_mask)) + continue; + + /* Sanity check */ + if (clkr->div <= last_div) + pr_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 */ + } + + if (!clkr->div) { + pr_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 = clkr->div; + + pr_debug("clock: new_div = %d, new_rate = %ld\n", *new_div, + (clk->parent->rate / clkr->div)); + + return clk->parent->rate / clkr->div; +} + +/** + * 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; + + return omap2_clksel_round_rate_div(clk, target_rate, &new_div); +} + + +/* 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) + 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; +} + +/** + * 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 + */ +u32 omap2_clksel_to_divisor(struct clk *clk, u32 field_val) +{ + const struct clksel *clks; + const struct clksel_rate *clkr; + + clks = _omap2_get_clksel_by_parent(clk, clk->parent); + if (!clks) + return 0; + + for (clkr = clks->rates; clkr->div; clkr++) { + if ((clkr->flags & cpu_mask) && (clkr->val == field_val)) + break; + } + + 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 clkr->div; +} + +/** + * 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 ~0 on error + */ +u32 omap2_divisor_to_clksel(struct clk *clk, u32 div) +{ + const struct clksel *clks; + const struct clksel_rate *clkr; + + /* should never happen */ + WARN_ON(div == 0); + + clks = _omap2_get_clksel_by_parent(clk, clk->parent); + if (!clks) + return ~0; + + for (clkr = clks->rates; clkr->div; clkr++) { + if ((clkr->flags & cpu_mask) && (clkr->div == div)) + break; + } + + 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; + } + + return clkr->val; +} + +/** + * 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. + */ +u32 omap2_clksel_get_divisor(struct clk *clk) +{ + u32 v; + + if (!clk->clksel_mask) + return 0; + + v = __raw_readl(clk->clksel_reg) & clk->clksel_mask; + v >>= __ffs(clk->clksel_mask); + + return omap2_clksel_to_divisor(clk, v); +} + +int omap2_clksel_set_rate(struct clk *clk, unsigned long rate) +{ + u32 v, field_val, validrate, new_div = 0; + + if (!clk->clksel_mask) + return -EINVAL; + + validrate = omap2_clksel_round_rate_div(clk, rate, &new_div); + if (validrate != rate) + return -EINVAL; + + field_val = omap2_divisor_to_clksel(clk, new_div); + if (field_val == ~0) + return -EINVAL; + + v = __raw_readl(clk->clksel_reg); + v &= ~clk->clksel_mask; + v |= field_val << __ffs(clk->clksel_mask); + __raw_writel(v, clk->clksel_reg); + v = __raw_readl(clk->clksel_reg); /* OCP barrier */ + + clk->rate = clk->parent->rate / new_div; + + omap2xxx_clk_commit(clk); + + return 0; +} + +int omap2_clksel_set_parent(struct clk *clk, struct clk *new_parent) +{ + u32 field_val, v, parent_div; + + if (!clk->clksel) + return -EINVAL; + + parent_div = _omap2_clksel_get_src_field(new_parent, clk, &field_val); + if (!parent_div) + return -EINVAL; + + /* Set new source value (previous dividers if any in effect) */ + v = __raw_readl(clk->clksel_reg); + v &= ~clk->clksel_mask; + v |= field_val << __ffs(clk->clksel_mask); + __raw_writel(v, clk->clksel_reg); + v = __raw_readl(clk->clksel_reg); /* OCP barrier */ + + omap2xxx_clk_commit(clk); + + clk_reparent(clk, new_parent); + + /* CLKSEL clocks follow their parents' rates, divided by a divisor */ + clk->rate = new_parent->rate; + + if (parent_div > 0) + clk->rate /= parent_div; + + pr_debug("clock: set parent of %s to %s (new rate %ld)\n", + clk->name, clk->parent->name, clk->rate); + + return 0; +} diff --git a/arch/arm/mach-omap2/clock.c b/arch/arm/mach-omap2/clock.c index 98196285e80c..d3ebb74873f8 100644 --- a/arch/arm/mach-omap2/clock.c +++ b/arch/arm/mach-omap2/clock.c @@ -43,14 +43,14 @@ u8 cpu_mask; *-------------------------------------------------------------------------*/ /** - * _omap2xxx_clk_commit - commit clock parent/rate changes in hardware + * omap2xxx_clk_commit - commit clock parent/rate changes in hardware * @clk: struct clk * * * If @clk has the DELAYED_APP flag set, meaning that parent/rate changes * don't take effect until the VALID_CONFIG bit is written, write the * VALID_CONFIG bit and wait for the write to complete. No return value. */ -static void _omap2xxx_clk_commit(struct clk *clk) +void omap2xxx_clk_commit(struct clk *clk) { if (!cpu_is_omap24xx()) return; @@ -91,49 +91,6 @@ void omap2_init_clk_clkdm(struct clk *clk) } /** - * 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) -{ - const struct clksel *clks; - const struct clksel_rate *clkr; - u32 r, found = 0; - - if (!clk->clksel) - return; - - r = __raw_readl(clk->clksel_reg) & clk->clksel_mask; - r >>= __ffs(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_reparent(clk, clks->parent); - }; - found = 1; - } - } - } - - if (!found) - printk(KERN_ERR "clock: init parent: could not find " - "regval %0x for clock %s\n", r, clk->name); - - return; -} - -/** * omap2_clk_dflt_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 @@ -335,274 +292,6 @@ err: return ret; } -/* - * Used for clocks that are part of CLKSEL_xyz governed clocks. - * REVISIT: Maybe change to use clk->enable() functions like on omap1? - */ -unsigned long omap2_clksel_recalc(struct clk *clk) -{ - unsigned long rate; - u32 div = 0; - - pr_debug("clock: recalc'ing clksel clk %s\n", clk->name); - - div = omap2_clksel_get_divisor(clk); - if (div == 0) - return clk->rate; - - rate = clk->parent->rate / div; - - pr_debug("clock: new clock rate is %ld (div %d)\n", rate, div); - - return rate; -} - -/** - * 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 const struct clksel *omap2_get_clksel_by_parent(struct clk *clk, - struct clk *src_clk) -{ - const struct clksel *clks; - - if (!clk->clksel) - return NULL; - - for (clks = clk->clksel; clks->parent; clks++) { - if (clks->parent == src_clk) - break; /* Found the requested parent */ - } - - 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; -} - -/** - * 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. - */ -u32 omap2_clksel_round_rate_div(struct clk *clk, unsigned long target_rate, - u32 *new_div) -{ - unsigned long test_rate; - const struct clksel *clks; - const struct clksel_rate *clkr; - u32 last_div = 0; - - pr_debug("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) - return ~0; - - for (clkr = clks->rates; clkr->div; clkr++) { - if (!(clkr->flags & cpu_mask)) - continue; - - /* Sanity check */ - if (clkr->div <= last_div) - pr_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 */ - } - - if (!clkr->div) { - pr_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 = clkr->div; - - pr_debug("clock: new_div = %d, new_rate = %ld\n", *new_div, - (clk->parent->rate / clkr->div)); - - return (clk->parent->rate / clkr->div); -} - -/** - * 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; - - return omap2_clksel_round_rate_div(clk, target_rate, &new_div); -} - - -/* 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) - 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; -} - -/** - * 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 - */ -u32 omap2_clksel_to_divisor(struct clk *clk, u32 field_val) -{ - const struct clksel *clks; - const struct clksel_rate *clkr; - - clks = omap2_get_clksel_by_parent(clk, clk->parent); - if (!clks) - return 0; - - for (clkr = clks->rates; clkr->div; clkr++) { - if ((clkr->flags & cpu_mask) && (clkr->val == field_val)) - break; - } - - 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 clkr->div; -} - -/** - * 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 ~0 on error - */ -u32 omap2_divisor_to_clksel(struct clk *clk, u32 div) -{ - const struct clksel *clks; - const struct clksel_rate *clkr; - - /* should never happen */ - WARN_ON(div == 0); - - clks = omap2_get_clksel_by_parent(clk, clk->parent); - if (!clks) - return ~0; - - for (clkr = clks->rates; clkr->div; clkr++) { - if ((clkr->flags & cpu_mask) && (clkr->div == div)) - break; - } - - 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; - } - - return clkr->val; -} - -/** - * 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. - */ -u32 omap2_clksel_get_divisor(struct clk *clk) -{ - u32 v; - - if (!clk->clksel_mask) - return 0; - - v = __raw_readl(clk->clksel_reg) & clk->clksel_mask; - v >>= __ffs(clk->clksel_mask); - - return omap2_clksel_to_divisor(clk, v); -} - -int omap2_clksel_set_rate(struct clk *clk, unsigned long rate) -{ - u32 v, field_val, validrate, new_div = 0; - - if (!clk->clksel_mask) - return -EINVAL; - - validrate = omap2_clksel_round_rate_div(clk, rate, &new_div); - if (validrate != rate) - return -EINVAL; - - field_val = omap2_divisor_to_clksel(clk, new_div); - if (field_val == ~0) - return -EINVAL; - - v = __raw_readl(clk->clksel_reg); - v &= ~clk->clksel_mask; - v |= field_val << __ffs(clk->clksel_mask); - __raw_writel(v, clk->clksel_reg); - v = __raw_readl(clk->clksel_reg); /* OCP barrier */ - - clk->rate = clk->parent->rate / new_div; - - _omap2xxx_clk_commit(clk); - - return 0; -} - - /* Set the clock rate for a clock source */ int omap2_clk_set_rate(struct clk *clk, unsigned long rate) { @@ -622,75 +311,15 @@ int omap2_clk_set_rate(struct clk *clk, unsigned long rate) return ret; } -/* - * Converts encoded control register address into a full address - * On error, the return value (parent_div) will be 0. - */ -static u32 _omap2_clksel_get_src_field(struct clk *src_clk, struct clk *clk, - u32 *field_val) -{ - const struct clksel *clks; - const struct clksel_rate *clkr; - - clks = omap2_get_clksel_by_parent(clk, src_clk); - if (!clks) - return 0; - - for (clkr = clks->rates; clkr->div; clkr++) { - if (clkr->flags & cpu_mask && clkr->flags & 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; - } - - /* Should never happen. Add a clksel mask to the struct clk. */ - WARN_ON(clk->clksel_mask == 0); - - *field_val = clkr->val; - - return clkr->div; -} - int omap2_clk_set_parent(struct clk *clk, struct clk *new_parent) { - u32 field_val, v, parent_div; - if (clk->flags & CONFIG_PARTICIPANT) return -EINVAL; if (!clk->clksel) return -EINVAL; - parent_div = _omap2_clksel_get_src_field(new_parent, clk, &field_val); - if (!parent_div) - return -EINVAL; - - /* Set new source value (previous dividers if any in effect) */ - v = __raw_readl(clk->clksel_reg); - v &= ~clk->clksel_mask; - v |= field_val << __ffs(clk->clksel_mask); - __raw_writel(v, clk->clksel_reg); - v = __raw_readl(clk->clksel_reg); /* OCP barrier */ - - _omap2xxx_clk_commit(clk); - - clk_reparent(clk, new_parent); - - /* CLKSEL clocks follow their parents' rates, divided by a divisor */ - clk->rate = new_parent->rate; - - if (parent_div > 0) - clk->rate /= parent_div; - - pr_debug("clock: set parent of %s to %s (new rate %ld)\n", - clk->name, clk->parent->name, clk->rate); - - return 0; + return omap2_clksel_set_parent(clk, new_parent); } /*------------------------------------------------------------------------- diff --git a/arch/arm/mach-omap2/clock.h b/arch/arm/mach-omap2/clock.h index 0d70dc09370b..0d21702a3cdd 100644 --- a/arch/arm/mach-omap2/clock.h +++ b/arch/arm/mach-omap2/clock.h @@ -80,6 +80,7 @@ u32 omap2_clksel_to_divisor(struct clk *clk, u32 field_val); u32 omap2_divisor_to_clksel(struct clk *clk, u32 div); long omap2_clksel_round_rate(struct clk *clk, unsigned long target_rate); int omap2_clksel_set_rate(struct clk *clk, unsigned long rate); +int omap2_clksel_set_parent(struct clk *clk, struct clk *new_parent); u32 omap2_get_dpll_rate(struct clk *clk); void omap2_init_dpll_parent(struct clk *clk); int omap2_wait_clock_ready(void __iomem *reg, u32 cval, const char *name); @@ -90,6 +91,7 @@ void omap2_clk_dflt_find_companion(struct clk *clk, void __iomem **other_reg, u8 *other_bit); void omap2_clk_dflt_find_idlest(struct clk *clk, void __iomem **idlest_reg, u8 *idlest_bit); +void omap2xxx_clk_commit(struct clk *clk); extern u8 cpu_mask; |