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-rw-r--r--arch/arm/mach-omap2/clock34xx.c577
1 files changed, 90 insertions, 487 deletions
diff --git a/arch/arm/mach-omap2/clock34xx.c b/arch/arm/mach-omap2/clock34xx.c
index 31bb7010bd4..4596468e50a 100644
--- a/arch/arm/mach-omap2/clock34xx.c
+++ b/arch/arm/mach-omap2/clock34xx.c
@@ -2,13 +2,14 @@
* OMAP3-specific clock framework functions
*
* Copyright (C) 2007-2008 Texas Instruments, Inc.
- * Copyright (C) 2007-2008 Nokia Corporation
+ * Copyright (C) 2007-2011 Nokia Corporation
*
- * Written by Paul Walmsley
- * Testing and integration fixes by Jouni Högander
+ * Paul Walmsley
+ * Jouni Högander
*
* Parts of this code are based on code written by
- * Richard Woodruff, Tony Lindgren, Tuukka Tikkanen, Karthik Dasu
+ * Richard Woodruff, Tony Lindgren, Tuukka Tikkanen, Karthik Dasu,
+ * Russell King
*
* 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
@@ -16,520 +17,122 @@
*/
#undef DEBUG
-#include <linux/module.h>
#include <linux/kernel.h>
-#include <linux/device.h>
-#include <linux/list.h>
-#include <linux/errno.h>
-#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/io.h>
-#include <linux/limits.h>
-#include <linux/bitops.h>
-#include <mach/clock.h>
-#include <mach/sram.h>
-#include <asm/div64.h>
-
-#include "memory.h"
#include "clock.h"
#include "clock34xx.h"
-#include "prm.h"
-#include "prm-regbits-34xx.h"
-#include "cm.h"
+#include "cm3xxx.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.
- */
-static void omap3_dpll_recalc(struct clk *clk)
-{
- clk->rate = omap2_get_dpll_rate(clk);
-
- propagate_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;
- u32 idlest_mask;
-
- dd = clk->dpll_data;
-
- state <<= dd->idlest_bit;
- idlest_mask = 1 << dd->idlest_bit;
-
- while (((__raw_readl(dd->idlest_reg) & 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;
-}
-
-/* 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;
-
- if (clk == &dpll3_ck)
- return -EINVAL;
-
- pr_debug("clock: locking DPLL %s\n", clk->name);
-
- ai = omap3_dpll_autoidle_read(clk);
-
- _omap3_dpll_write_clken(clk, DPLL_LOCKED);
-
- if (ai) {
- /*
- * If no downstream clocks are enabled, CM_IDLEST bit
- * may never become active, so don't wait for DPLL to lock.
- */
- r = 0;
- omap3_dpll_allow_idle(clk);
- } else {
- r = _omap3_wait_dpll_status(clk, 1);
- omap3_dpll_deny_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 == &dpll3_ck)
- return -EINVAL;
-
- 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 == &dpll3_ck)
- return -EINVAL;
-
- 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
+ * omap3430es2_clk_ssi_find_idlest - return CM_IDLEST info for SSI
+ * @clk: struct clk * being enabled
+ * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
+ * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
+ * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
*
- * 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.
+ * The OMAP3430ES2 SSI target CM_IDLEST bit is at a different shift
+ * from the CM_{I,F}CLKEN bit. Pass back the correct info via
+ * @idlest_reg and @idlest_bit. No return value.
*/
-static int omap3_noncore_dpll_enable(struct clk *clk)
+static void omap3430es2_clk_ssi_find_idlest(struct clk_hw_omap *clk,
+ void __iomem **idlest_reg,
+ u8 *idlest_bit,
+ u8 *idlest_val)
{
- int r;
+ u32 r;
- if (clk == &dpll3_ck)
- return -EINVAL;
-
- if (clk->parent->rate == clk_get_rate(clk))
- r = _omap3_noncore_dpll_bypass(clk);
- else
- r = _omap3_noncore_dpll_lock(clk);
-
- return r;
+ r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
+ *idlest_reg = (__force void __iomem *)r;
+ *idlest_bit = OMAP3430ES2_ST_SSI_IDLE_SHIFT;
+ *idlest_val = OMAP34XX_CM_IDLEST_VAL;
}
+const struct clk_hw_omap_ops clkhwops_omap3430es2_ssi_wait = {
+ .find_idlest = omap3430es2_clk_ssi_find_idlest,
+ .find_companion = omap2_clk_dflt_find_companion,
+};
-/**
- * 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 void omap3_noncore_dpll_disable(struct clk *clk)
-{
- if (clk == &dpll3_ck)
- return;
-
- _omap3_noncore_dpll_stop(clk);
-}
-
-/**
- * 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.
- */
-static 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;
-}
+const struct clk_hw_omap_ops clkhwops_omap3430es2_iclk_ssi_wait = {
+ .allow_idle = omap2_clkt_iclk_allow_idle,
+ .deny_idle = omap2_clkt_iclk_deny_idle,
+ .find_idlest = omap3430es2_clk_ssi_find_idlest,
+ .find_companion = omap2_clk_dflt_find_companion,
+};
/**
- * omap3_dpll_allow_idle - enable DPLL autoidle bits
- * @clk: struct clk * of the DPLL to operate on
+ * omap3430es2_clk_dss_usbhost_find_idlest - CM_IDLEST info for DSS, USBHOST
+ * @clk: struct clk * being enabled
+ * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
+ * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
+ * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
*
- * 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.
+ * Some OMAP modules on OMAP3 ES2+ chips have both initiator and
+ * target IDLEST bits. For our purposes, we are concerned with the
+ * target IDLEST bits, which exist at a different bit position than
+ * the *CLKEN bit position for these modules (DSS and USBHOST) (The
+ * default find_idlest code assumes that they are at the same
+ * position.) No return value.
*/
-static void omap3_dpll_allow_idle(struct clk *clk)
+static void omap3430es2_clk_dss_usbhost_find_idlest(struct clk_hw_omap *clk,
+ void __iomem **idlest_reg,
+ u8 *idlest_bit,
+ u8 *idlest_val)
{
- const struct dpll_data *dd;
- u32 v;
-
- if (!clk || !clk->dpll_data)
- return;
+ u32 r;
- 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);
+ r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
+ *idlest_reg = (__force void __iomem *)r;
+ /* USBHOST_IDLE has same shift */
+ *idlest_bit = OMAP3430ES2_ST_DSS_IDLE_SHIFT;
+ *idlest_val = OMAP34XX_CM_IDLEST_VAL;
}
-/**
- * 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.
- */
-static 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);
-}
+const struct clk_hw_omap_ops clkhwops_omap3430es2_dss_usbhost_wait = {
+ .find_idlest = omap3430es2_clk_dss_usbhost_find_idlest,
+ .find_companion = omap2_clk_dflt_find_companion,
+};
-/* Clock control for DPLL outputs */
+const struct clk_hw_omap_ops clkhwops_omap3430es2_iclk_dss_usbhost_wait = {
+ .allow_idle = omap2_clkt_iclk_allow_idle,
+ .deny_idle = omap2_clkt_iclk_deny_idle,
+ .find_idlest = omap3430es2_clk_dss_usbhost_find_idlest,
+ .find_companion = omap2_clk_dflt_find_companion,
+};
/**
- * omap3_clkoutx2_recalc - recalculate DPLL X2 output virtual clock rate
- * @clk: DPLL output struct clk
+ * omap3430es2_clk_hsotgusb_find_idlest - return CM_IDLEST info for HSOTGUSB
+ * @clk: struct clk * being enabled
+ * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
+ * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
+ * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
*
- * Using parent clock DPLL data, look up DPLL state. If locked, set our
- * rate to the dpll_clk * 2; otherwise, just use dpll_clk.
+ * The OMAP3430ES2 HSOTGUSB target CM_IDLEST bit is at a different
+ * shift from the CM_{I,F}CLKEN bit. Pass back the correct info via
+ * @idlest_reg and @idlest_bit. No return value.
*/
-static void omap3_clkoutx2_recalc(struct clk *clk)
+static void omap3430es2_clk_hsotgusb_find_idlest(struct clk_hw_omap *clk,
+ void __iomem **idlest_reg,
+ u8 *idlest_bit,
+ u8 *idlest_val)
{
- const struct dpll_data *dd;
- 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);
+ u32 r;
- dd = pclk->dpll_data;
-
- WARN_ON(!dd->control_reg || !dd->enable_mask);
-
- v = __raw_readl(dd->control_reg) & dd->enable_mask;
- v >>= __ffs(dd->enable_mask);
- if (v != DPLL_LOCKED)
- clk->rate = clk->parent->rate;
- else
- clk->rate = clk->parent->rate * 2;
-
- if (clk->flags & RATE_PROPAGATES)
- propagate_rate(clk);
+ r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
+ *idlest_reg = (__force void __iomem *)r;
+ *idlest_bit = OMAP3430ES2_ST_HSOTGUSB_IDLE_SHIFT;
+ *idlest_val = OMAP34XX_CM_IDLEST_VAL;
}
-/* Common clock code */
-
-/*
- * As it is structured now, this will prevent an OMAP2/3 multiboot
- * kernel from compiling. This will need further attention.
- */
-#if defined(CONFIG_ARCH_OMAP3)
-
-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,
+const struct clk_hw_omap_ops clkhwops_omap3430es2_iclk_hsotgusb_wait = {
+ .allow_idle = omap2_clkt_iclk_allow_idle,
+ .deny_idle = omap2_clkt_iclk_deny_idle,
+ .find_idlest = omap3430es2_clk_hsotgusb_find_idlest,
+ .find_companion = omap2_clk_dflt_find_companion,
};
-/*
- * Set clocks for bypass mode for reboot to work.
- */
-void omap2_clk_prepare_for_reboot(void)
-{
- /* REVISIT: Not ready for 343x */
-#if 0
- u32 rate;
-
- if (vclk == NULL || sclk == NULL)
- return;
-
- rate = clk_get_rate(sclk);
- clk_set_rate(vclk, rate);
-#endif
-}
-
-/* REVISIT: Move this init stuff out into clock.c */
-
-/*
- * 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;
-
- /* REVISIT: not yet ready for 343x */
-#if 0
- if (omap2_select_table_rate(&virt_prcm_set, mpurate))
- printk(KERN_ERR "Could not find matching MPU rate\n");
-#endif
-
- recalculate_root_clocks();
-
- printk(KERN_INFO "Switched to new clocking rate (Crystal/DPLL3/MPU): "
- "%ld.%01ld/%ld/%ld MHz\n",
- (osc_sys_ck.rate / 1000000), (osc_sys_ck.rate / 100000) % 10,
- (core_ck.rate / 1000000), (dpll1_fck.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; */
- u32 cpu_clkflg;
-
- /* REVISIT: Ultimately this will be used for multiboot */
-#if 0
- if (cpu_is_omap242x()) {
- cpu_mask = RATE_IN_242X;
- cpu_clkflg = CLOCK_IN_OMAP242X;
- clkp = onchip_24xx_clks;
- } else if (cpu_is_omap2430()) {
- cpu_mask = RATE_IN_243X;
- cpu_clkflg = CLOCK_IN_OMAP243X;
- clkp = onchip_24xx_clks;
- }
-#endif
- if (cpu_is_omap34xx()) {
- cpu_mask = RATE_IN_343X;
- cpu_clkflg = CLOCK_IN_OMAP343X;
- clkp = onchip_34xx_clks;
-
- /*
- * Update this if there are further clock changes between ES2
- * and production parts
- */
- if (omap_rev() == OMAP3430_REV_ES1_0) {
- /* No 3430ES1-only rates exist, so no RATE_IN_3430ES1 */
- cpu_clkflg |= CLOCK_IN_OMAP3430ES1;
- } else {
- cpu_mask |= RATE_IN_3430ES2;
- cpu_clkflg |= CLOCK_IN_OMAP3430ES2;
- }
- }
-
- clk_init(&omap2_clk_functions);
-
- for (clkp = onchip_34xx_clks;
- clkp < onchip_34xx_clks + ARRAY_SIZE(onchip_34xx_clks);
- clkp++) {
- if ((*clkp)->flags & cpu_clkflg) {
- clk_register(*clkp);
- omap2_init_clk_clkdm(*clkp);
- }
- }
-
- /* REVISIT: Not yet ready for OMAP3 */
-#if 0
- /* Check the MPU rate set by bootloader */
- clkrate = omap2_get_dpll_rate_24xx(&dpll_ck);
- for (prcm = rate_table; prcm->mpu_speed; prcm++) {
- if (!(prcm->flags & cpu_mask))
- continue;
- if (prcm->xtal_speed != sys_ck.rate)
- continue;
- if (prcm->dpll_speed <= clkrate)
- break;
- }
- curr_prcm_set = prcm;
-#endif
-
- recalculate_root_clocks();
-
- printk(KERN_INFO "Clocking rate (Crystal/DPLL/ARM core): "
- "%ld.%01ld/%ld/%ld MHz\n",
- (osc_sys_ck.rate / 1000000), (osc_sys_ck.rate / 100000) % 10,
- (core_ck.rate / 1000000), (arm_fck.rate / 1000000));
-
- /*
- * Only enable those clocks we will need, let the drivers
- * enable other clocks as necessary
- */
- clk_enable_init_clocks();
-
- /* Avoid sleeping during omap2_clk_prepare_for_reboot() */
- /* REVISIT: not yet ready for 343x */
-#if 0
- vclk = clk_get(NULL, "virt_prcm_set");
- sclk = clk_get(NULL, "sys_ck");
-#endif
- return 0;
-}
-
-#endif
+const struct clk_hw_omap_ops clkhwops_omap3430es2_hsotgusb_wait = {
+ .find_idlest = omap3430es2_clk_hsotgusb_find_idlest,
+ .find_companion = omap2_clk_dflt_find_companion,
+};