From a1391d276866845018920329bc2a3a82ab322af8 Mon Sep 17 00:00:00 2001 From: Rajendra Nayak Date: Tue, 8 Dec 2009 18:47:16 -0700 Subject: [PATCH] ARM: OMAP4: PM: Move DPLL control apis to dpll.c 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 Signed-off-by: Paul Walmsley Cc: Benoit Cousson --- 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 3078ff4d3c71..551df7272247 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 87c08056b303..4df7aa43ef44 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 6dc46dc1ea3a..ded32364f32b 100644 --- a/arch/arm/mach-omap2/clock34xx.c +++ b/arch/arm/mach-omap2/clock34xx.c @@ -43,12 +43,6 @@ #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 /* @@ -149,376 +143,11 @@ 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) { /* @@ -622,124 +251,6 @@ 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 b08809efb0c8..9a2c07eac9ad 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 c1bc4b6eb6b3..59b9ced4daa1 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 000000000000..a39fe9d8c278 --- /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 +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +#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; +}