From b1823d8616b11477e9e0967c727ed5325fb12403 Mon Sep 17 00:00:00 2001 From: Paul Walmsley Date: Tue, 26 Jan 2010 20:13:06 -0700 Subject: OMAP2xxx clock: move the DPLL+CORE composite clock code into mach-omap2/clkt2xxx_dpllcore.c Move the DPLL+CORE composite clock functions from clock2xxx.c to mach-omap2/clkt2xxx_dpllcore.c. This is intended to make the clock code easier to understand, since all of the functions needed to manage the OMAP2 DPLL+CORE clock are now located in their own file, rather than being mixed with other, unrelated functions. Clock debugging is also now more finely-grained, since the DEBUG macro can now be defined for the DPLL+CORE clock alone. This should reduce unnecessary console noise when debugging. Also, if at some future point the mach-omap2/ directory is split into OMAP2/3/4 variants, this clkt file can be placed in the mach-omap2xxx/ directory, rather than shared with other chip types that don't use this clock type. Thanks to Alexander Shishkin for his comments to improve the patch description. Signed-off-by: Paul Walmsley Cc: Richard Woodruff Cc: Alexander Shishkin --- arch/arm/mach-omap2/Makefile | 4 +- arch/arm/mach-omap2/clkt2xxx_dpllcore.c | 173 ++++++++++++++++++++++++++++++++ arch/arm/mach-omap2/clock2xxx.c | 136 ------------------------- 3 files changed, 176 insertions(+), 137 deletions(-) create mode 100644 arch/arm/mach-omap2/clkt2xxx_dpllcore.c (limited to 'arch/arm/mach-omap2') diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile index 9ecc58d2c986..04ce372bb105 100644 --- a/arch/arm/mach-omap2/Makefile +++ b/arch/arm/mach-omap2/Makefile @@ -11,8 +11,10 @@ prcm-common = prcm.o powerdomain.o clock-common = clock.o clock_common_data.o \ clockdomain.o clkt_dpll.o \ clkt_clksel.o +clock-omap2xxx = clkt2xxx_dpllcore.o -obj-$(CONFIG_ARCH_OMAP2) += $(omap-2-3-common) $(prcm-common) $(clock-common) +obj-$(CONFIG_ARCH_OMAP2) += $(omap-2-3-common) $(prcm-common) $(clock-common) \ + $(clock-omap2xxx) obj-$(CONFIG_ARCH_OMAP3) += $(omap-2-3-common) $(prcm-common) $(clock-common) \ $(omap-3-4-common) obj-$(CONFIG_ARCH_OMAP4) += $(omap-3-4-common) $(prcm-common) $(clock-common) diff --git a/arch/arm/mach-omap2/clkt2xxx_dpllcore.c b/arch/arm/mach-omap2/clkt2xxx_dpllcore.c new file mode 100644 index 000000000000..019048434f13 --- /dev/null +++ b/arch/arm/mach-omap2/clkt2xxx_dpllcore.c @@ -0,0 +1,173 @@ +/* + * DPLL + CORE_CLK composite clock functions + * + * Copyright (C) 2005-2008 Texas Instruments, Inc. + * Copyright (C) 2004-2010 Nokia Corporation + * + * Contacts: + * Richard Woodruff + * Paul Walmsley + * + * Based on earlier work by Tuukka Tikkanen, Tony Lindgren, + * Gordon McNutt and RidgeRun, Inc. + * + * 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 The DPLL and CORE clocks should be split into two separate clock + * types. + */ +#undef DEBUG + +#include +#include +#include +#include + +#include +#include +#include + +#include "clock.h" +#include "clock2xxx.h" +#include "opp2xxx.h" +#include "cm.h" +#include "cm-regbits-24xx.h" + +/* #define DOWN_VARIABLE_DPLL 1 */ /* Experimental */ + +/** + * omap2xxx_clk_get_core_rate - return the CORE_CLK rate + * @clk: pointer to the combined dpll_ck + core_ck (currently "dpll_ck") + * + * Returns the CORE_CLK rate. CORE_CLK can have one of three rate + * sources on OMAP2xxx: the DPLL CLKOUT rate, DPLL CLKOUTX2, or 32KHz + * (the latter is unusual). This currently should be called with + * struct clk *dpll_ck, which is a composite clock of dpll_ck and + * core_ck. + */ +unsigned long omap2xxx_clk_get_core_rate(struct clk *clk) +{ + long long core_clk; + u32 v; + + core_clk = omap2_get_dpll_rate(clk); + + v = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2); + v &= OMAP24XX_CORE_CLK_SRC_MASK; + + if (v == CORE_CLK_SRC_32K) + core_clk = 32768; + else + core_clk *= v; + + return core_clk; +} + +/* + * 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 long omap2_dpllcore_round_rate(unsigned long target_rate) +{ + u32 high, low, core_clk_src; + + core_clk_src = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2); + core_clk_src &= OMAP24XX_CORE_CLK_SRC_MASK; + + if (core_clk_src == CORE_CLK_SRC_DPLL) { /* 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 + +} + +unsigned long omap2_dpllcore_recalc(struct clk *clk) +{ + return omap2xxx_clk_get_core_rate(clk); +} + +int omap2_reprogram_dpllcore(struct clk *clk, unsigned long rate) +{ + u32 cur_rate, low, mult, div, valid_rate, done_rate; + u32 bypass = 0; + struct prcm_config tmpset; + const struct dpll_data *dd; + + cur_rate = omap2xxx_clk_get_core_rate(dclk); + mult = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2); + mult &= OMAP24XX_CORE_CLK_SRC_MASK; + + if ((rate == (cur_rate / 2)) && (mult == 2)) { + omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL, 1); + } else if ((rate == (cur_rate * 2)) && (mult == 1)) { + omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL_X2, 1); + } else if (rate != cur_rate) { + valid_rate = omap2_dpllcore_round_rate(rate); + if (valid_rate != rate) + return -EINVAL; + + if (mult == 1) + low = curr_prcm_set->dpll_speed; + else + low = curr_prcm_set->dpll_speed / 2; + + dd = clk->dpll_data; + if (!dd) + return -EINVAL; + + tmpset.cm_clksel1_pll = __raw_readl(dd->mult_div1_reg); + tmpset.cm_clksel1_pll &= ~(dd->mult_mask | + dd->div1_mask); + div = ((curr_prcm_set->xtal_speed / 1000000) - 1); + tmpset.cm_clksel2_pll = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2); + tmpset.cm_clksel2_pll &= ~OMAP24XX_CORE_CLK_SRC_MASK; + if (rate > low) { + tmpset.cm_clksel2_pll |= CORE_CLK_SRC_DPLL_X2; + mult = ((rate / 2) / 1000000); + done_rate = CORE_CLK_SRC_DPLL_X2; + } else { + tmpset.cm_clksel2_pll |= CORE_CLK_SRC_DPLL; + mult = (rate / 1000000); + done_rate = CORE_CLK_SRC_DPLL; + } + tmpset.cm_clksel1_pll |= (div << __ffs(dd->mult_mask)); + tmpset.cm_clksel1_pll |= (mult << __ffs(dd->div1_mask)); + + /* Worst case */ + tmpset.base_sdrc_rfr = SDRC_RFR_CTRL_BYPASS; + + if (rate == curr_prcm_set->xtal_speed) /* If asking for 1-1 */ + bypass = 1; + + /* For omap2xxx_sdrc_init_params() */ + omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL_X2, 1); + + /* Force dll lock mode */ + omap2_set_prcm(tmpset.cm_clksel1_pll, tmpset.base_sdrc_rfr, + bypass); + + /* Errata: ret dll entry state */ + omap2xxx_sdrc_init_params(omap2xxx_sdrc_dll_is_unlocked()); + omap2xxx_sdrc_reprogram(done_rate, 0); + } + + return 0; +} + diff --git a/arch/arm/mach-omap2/clock2xxx.c b/arch/arm/mach-omap2/clock2xxx.c index bef557488fec..419ae80fa1d4 100644 --- a/arch/arm/mach-omap2/clock2xxx.c +++ b/arch/arm/mach-omap2/clock2xxx.c @@ -54,8 +54,6 @@ #define APLLS_CLKIN_13MHZ 2 #define APLLS_CLKIN_12MHZ 3 -/* #define DOWN_VARIABLE_DPLL 1 */ /* Experimental */ - const struct prcm_config *curr_prcm_set; const struct prcm_config *rate_table; @@ -94,34 +92,6 @@ const struct clkops clkops_omap2430_i2chs_wait = { .find_companion = omap2_clk_dflt_find_companion, }; -/** - * omap2xxx_clk_get_core_rate - return the CORE_CLK rate - * @clk: pointer to the combined dpll_ck + core_ck (currently "dpll_ck") - * - * Returns the CORE_CLK rate. CORE_CLK can have one of three rate - * sources on OMAP2xxx: the DPLL CLKOUT rate, DPLL CLKOUTX2, or 32KHz - * (the latter is unusual). This currently should be called with - * struct clk *dpll_ck, which is a composite clock of dpll_ck and - * core_ck. - */ -unsigned long omap2xxx_clk_get_core_rate(struct clk *clk) -{ - long long core_clk; - u32 v; - - core_clk = omap2_get_dpll_rate(clk); - - v = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2); - v &= OMAP24XX_CORE_CLK_SRC_MASK; - - if (v == CORE_CLK_SRC_32K) - core_clk = 32768; - else - core_clk *= v; - - return core_clk; -} - static int omap2_enable_osc_ck(struct clk *clk) { u32 pcc; @@ -215,112 +185,6 @@ const struct clkops clkops_apll54 = { .disable = omap2_clk_apll_disable, }; -/* - * Uses the current prcm set to tell if a rate is valid. - * You can go slower, but not faster within a given rate set. - */ -long omap2_dpllcore_round_rate(unsigned long target_rate) -{ - u32 high, low, core_clk_src; - - core_clk_src = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2); - core_clk_src &= OMAP24XX_CORE_CLK_SRC_MASK; - - if (core_clk_src == CORE_CLK_SRC_DPLL) { /* 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 - -} - -unsigned long omap2_dpllcore_recalc(struct clk *clk) -{ - return omap2xxx_clk_get_core_rate(clk); -} - -int omap2_reprogram_dpllcore(struct clk *clk, unsigned long rate) -{ - u32 cur_rate, low, mult, div, valid_rate, done_rate; - u32 bypass = 0; - struct prcm_config tmpset; - const struct dpll_data *dd; - - cur_rate = omap2xxx_clk_get_core_rate(dclk); - mult = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2); - mult &= OMAP24XX_CORE_CLK_SRC_MASK; - - if ((rate == (cur_rate / 2)) && (mult == 2)) { - omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL, 1); - } else if ((rate == (cur_rate * 2)) && (mult == 1)) { - omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL_X2, 1); - } else if (rate != cur_rate) { - valid_rate = omap2_dpllcore_round_rate(rate); - if (valid_rate != rate) - return -EINVAL; - - if (mult == 1) - low = curr_prcm_set->dpll_speed; - else - low = curr_prcm_set->dpll_speed / 2; - - dd = clk->dpll_data; - if (!dd) - return -EINVAL; - - tmpset.cm_clksel1_pll = __raw_readl(dd->mult_div1_reg); - tmpset.cm_clksel1_pll &= ~(dd->mult_mask | - dd->div1_mask); - div = ((curr_prcm_set->xtal_speed / 1000000) - 1); - tmpset.cm_clksel2_pll = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2); - tmpset.cm_clksel2_pll &= ~OMAP24XX_CORE_CLK_SRC_MASK; - if (rate > low) { - tmpset.cm_clksel2_pll |= CORE_CLK_SRC_DPLL_X2; - mult = ((rate / 2) / 1000000); - done_rate = CORE_CLK_SRC_DPLL_X2; - } else { - tmpset.cm_clksel2_pll |= CORE_CLK_SRC_DPLL; - mult = (rate / 1000000); - done_rate = CORE_CLK_SRC_DPLL; - } - tmpset.cm_clksel1_pll |= (div << __ffs(dd->mult_mask)); - tmpset.cm_clksel1_pll |= (mult << __ffs(dd->div1_mask)); - - /* Worst case */ - tmpset.base_sdrc_rfr = SDRC_RFR_CTRL_BYPASS; - - if (rate == curr_prcm_set->xtal_speed) /* If asking for 1-1 */ - bypass = 1; - - /* For omap2xxx_sdrc_init_params() */ - omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL_X2, 1); - - /* Force dll lock mode */ - omap2_set_prcm(tmpset.cm_clksel1_pll, tmpset.base_sdrc_rfr, - bypass); - - /* Errata: ret dll entry state */ - omap2xxx_sdrc_init_params(omap2xxx_sdrc_dll_is_unlocked()); - omap2xxx_sdrc_reprogram(done_rate, 0); - } - - return 0; -} - /** * omap2_table_mpu_recalc - just return the MPU speed * @clk: virt_prcm_set struct clk -- cgit v1.2.3