| /* |
| * linux/arch/arm/mach-omap2/clock.c |
| * |
| * 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. |
| */ |
| #undef DEBUG |
| |
| #include <linux/kernel.h> |
| #include <linux/export.h> |
| #include <linux/list.h> |
| #include <linux/errno.h> |
| #include <linux/err.h> |
| #include <linux/delay.h> |
| #include <linux/clk-provider.h> |
| #include <linux/io.h> |
| #include <linux/bitops.h> |
| #include <linux/clk-private.h> |
| #include <asm/cpu.h> |
| |
| #include <trace/events/power.h> |
| |
| #include "soc.h" |
| #include "clockdomain.h" |
| #include "clock.h" |
| #include "cm.h" |
| #include "cm2xxx.h" |
| #include "cm3xxx.h" |
| #include "cm-regbits-24xx.h" |
| #include "cm-regbits-34xx.h" |
| #include "common.h" |
| |
| /* |
| * MAX_MODULE_ENABLE_WAIT: maximum of number of microseconds to wait |
| * for a module to indicate that it is no longer in idle |
| */ |
| #define MAX_MODULE_ENABLE_WAIT 100000 |
| |
| u16 cpu_mask; |
| |
| /* |
| * clkdm_control: if true, then when a clock is enabled in the |
| * hardware, its clockdomain will first be enabled; and when a clock |
| * is disabled in the hardware, its clockdomain will be disabled |
| * afterwards. |
| */ |
| static bool clkdm_control = true; |
| |
| static LIST_HEAD(clk_hw_omap_clocks); |
| void __iomem *clk_memmaps[CLK_MAX_MEMMAPS]; |
| |
| void omap2_clk_writel(u32 val, struct clk_hw_omap *clk, void __iomem *reg) |
| { |
| if (clk->flags & MEMMAP_ADDRESSING) { |
| struct clk_omap_reg *r = (struct clk_omap_reg *)® |
| writel_relaxed(val, clk_memmaps[r->index] + r->offset); |
| } else { |
| writel_relaxed(val, reg); |
| } |
| } |
| |
| u32 omap2_clk_readl(struct clk_hw_omap *clk, void __iomem *reg) |
| { |
| u32 val; |
| |
| if (clk->flags & MEMMAP_ADDRESSING) { |
| struct clk_omap_reg *r = (struct clk_omap_reg *)® |
| val = readl_relaxed(clk_memmaps[r->index] + r->offset); |
| } else { |
| val = readl_relaxed(reg); |
| } |
| |
| return val; |
| } |
| |
| /* |
| * OMAP2+ specific clock functions |
| */ |
| |
| /* Private functions */ |
| |
| |
| /** |
| * _wait_idlest_generic - wait for a module to leave the idle state |
| * @clk: module clock to wait for (needed for register offsets) |
| * @reg: virtual address of module IDLEST register |
| * @mask: value to mask against to determine if the module is active |
| * @idlest: idle state indicator (0 or 1) for the clock |
| * @name: name of the clock (for printk) |
| * |
| * Wait for a module to leave idle, where its idle-status register is |
| * not inside the CM module. Returns 1 if the module left idle |
| * promptly, or 0 if the module did not leave idle before the timeout |
| * elapsed. XXX Deprecated - should be moved into drivers for the |
| * individual IP block that the IDLEST register exists in. |
| */ |
| static int _wait_idlest_generic(struct clk_hw_omap *clk, void __iomem *reg, |
| u32 mask, u8 idlest, const char *name) |
| { |
| int i = 0, ena = 0; |
| |
| ena = (idlest) ? 0 : mask; |
| |
| omap_test_timeout(((omap2_clk_readl(clk, reg) & mask) == ena), |
| MAX_MODULE_ENABLE_WAIT, i); |
| |
| if (i < MAX_MODULE_ENABLE_WAIT) |
| pr_debug("omap clock: module associated with clock %s ready after %d loops\n", |
| name, i); |
| else |
| pr_err("omap clock: module associated with clock %s didn't enable in %d tries\n", |
| name, MAX_MODULE_ENABLE_WAIT); |
| |
| return (i < MAX_MODULE_ENABLE_WAIT) ? 1 : 0; |
| }; |
| |
| /** |
| * _omap2_module_wait_ready - wait for an OMAP module to leave IDLE |
| * @clk: struct clk * belonging to the module |
| * |
| * If the necessary clocks for the OMAP hardware IP block that |
| * corresponds to clock @clk are enabled, then wait for the module to |
| * indicate readiness (i.e., to leave IDLE). This code does not |
| * belong in the clock code and will be moved in the medium term to |
| * module-dependent code. No return value. |
| */ |
| static void _omap2_module_wait_ready(struct clk_hw_omap *clk) |
| { |
| void __iomem *companion_reg, *idlest_reg; |
| u8 other_bit, idlest_bit, idlest_val, idlest_reg_id; |
| s16 prcm_mod; |
| int r; |
| |
| /* Not all modules have multiple clocks that their IDLEST depends on */ |
| if (clk->ops->find_companion) { |
| clk->ops->find_companion(clk, &companion_reg, &other_bit); |
| if (!(omap2_clk_readl(clk, companion_reg) & (1 << other_bit))) |
| return; |
| } |
| |
| clk->ops->find_idlest(clk, &idlest_reg, &idlest_bit, &idlest_val); |
| r = cm_split_idlest_reg(idlest_reg, &prcm_mod, &idlest_reg_id); |
| if (r) { |
| /* IDLEST register not in the CM module */ |
| _wait_idlest_generic(clk, idlest_reg, (1 << idlest_bit), |
| idlest_val, __clk_get_name(clk->hw.clk)); |
| } else { |
| cm_wait_module_ready(prcm_mod, idlest_reg_id, idlest_bit); |
| }; |
| } |
| |
| /* Public functions */ |
| |
| /** |
| * omap2_init_clk_clkdm - look up a clockdomain name, store pointer in clk |
| * @clk: OMAP clock struct ptr to use |
| * |
| * Convert a clockdomain name stored in a struct clk 'clk' into a |
| * clockdomain pointer, and save it into the struct clk. Intended to be |
| * called during clk_register(). No return value. |
| */ |
| void omap2_init_clk_clkdm(struct clk_hw *hw) |
| { |
| struct clk_hw_omap *clk = to_clk_hw_omap(hw); |
| struct clockdomain *clkdm; |
| const char *clk_name; |
| |
| if (!clk->clkdm_name) |
| return; |
| |
| clk_name = __clk_get_name(hw->clk); |
| |
| clkdm = clkdm_lookup(clk->clkdm_name); |
| if (clkdm) { |
| pr_debug("clock: associated clk %s to clkdm %s\n", |
| clk_name, clk->clkdm_name); |
| clk->clkdm = clkdm; |
| } else { |
| pr_debug("clock: could not associate clk %s to clkdm %s\n", |
| clk_name, clk->clkdm_name); |
| } |
| } |
| |
| /** |
| * omap2_clk_disable_clkdm_control - disable clkdm control on clk enable/disable |
| * |
| * Prevent the OMAP clock code from calling into the clockdomain code |
| * when a hardware clock in that clockdomain is enabled or disabled. |
| * Intended to be called at init time from omap*_clk_init(). No |
| * return value. |
| */ |
| void __init omap2_clk_disable_clkdm_control(void) |
| { |
| clkdm_control = false; |
| } |
| |
| /** |
| * 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 |
| * @other_bit: u8 ** to return the companion clock bit shift in |
| * |
| * 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 |
| * |
| * Convert CM_ICLKEN* <-> CM_FCLKEN*. This conversion assumes it's |
| * just a matter of XORing the bits. |
| * |
| * Some clocks don't have companion clocks. For example, modules with |
| * only an interface clock (such as MAILBOXES) don't have a companion |
| * clock. Right now, this code relies on the hardware exporting a bit |
| * in the correct companion register that indicates that the |
| * nonexistent 'companion clock' is active. Future patches will |
| * associate this type of code with per-module data structures to |
| * avoid this issue, and remove the casts. No return value. |
| */ |
| void omap2_clk_dflt_find_companion(struct clk_hw_omap *clk, |
| void __iomem **other_reg, u8 *other_bit) |
| { |
| u32 r; |
| |
| /* |
| * Convert CM_ICLKEN* <-> CM_FCLKEN*. This conversion assumes |
| * it's just a matter of XORing the bits. |
| */ |
| r = ((__force u32)clk->enable_reg ^ (CM_FCLKEN ^ CM_ICLKEN)); |
| |
| *other_reg = (__force void __iomem *)r; |
| *other_bit = clk->enable_bit; |
| } |
| |
| /** |
| * omap2_clk_dflt_find_idlest - find CM_IDLEST reg va, bit shift for @clk |
| * @clk: struct clk * to find IDLEST info for |
| * @idlest_reg: void __iomem ** to return the CM_IDLEST va in |
| * @idlest_bit: u8 * to return the CM_IDLEST bit shift in |
| * @idlest_val: u8 * to return the idle status indicator |
| * |
| * Return the CM_IDLEST register address and bit shift corresponding |
| * to the module that "owns" this clock. This default code assumes |
| * that the CM_IDLEST bit shift is the CM_*CLKEN bit shift, and that |
| * the IDLEST register address ID corresponds to the CM_*CLKEN |
| * register address ID (e.g., that CM_FCLKEN2 corresponds to |
| * CM_IDLEST2). This is not true for all modules. No return value. |
| */ |
| void omap2_clk_dflt_find_idlest(struct clk_hw_omap *clk, |
| void __iomem **idlest_reg, u8 *idlest_bit, u8 *idlest_val) |
| { |
| u32 r; |
| |
| r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20); |
| *idlest_reg = (__force void __iomem *)r; |
| *idlest_bit = clk->enable_bit; |
| |
| /* |
| * 24xx uses 0 to indicate not ready, and 1 to indicate ready. |
| * 34xx reverses this, just to keep us on our toes |
| * AM35xx uses both, depending on the module. |
| */ |
| if (cpu_is_omap24xx()) |
| *idlest_val = OMAP24XX_CM_IDLEST_VAL; |
| else if (cpu_is_omap34xx()) |
| *idlest_val = OMAP34XX_CM_IDLEST_VAL; |
| else |
| BUG(); |
| |
| } |
| |
| /** |
| * omap2_dflt_clk_enable - enable a clock in the hardware |
| * @hw: struct clk_hw * of the clock to enable |
| * |
| * Enable the clock @hw in the hardware. We first call into the OMAP |
| * clockdomain code to "enable" the corresponding clockdomain if this |
| * is the first enabled user of the clockdomain. Then program the |
| * hardware to enable the clock. Then wait for the IP block that uses |
| * this clock to leave idle (if applicable). Returns the error value |
| * from clkdm_clk_enable() if it terminated with an error, or -EINVAL |
| * if @hw has a null clock enable_reg, or zero upon success. |
| */ |
| int omap2_dflt_clk_enable(struct clk_hw *hw) |
| { |
| struct clk_hw_omap *clk; |
| u32 v; |
| int ret = 0; |
| |
| clk = to_clk_hw_omap(hw); |
| |
| if (clkdm_control && clk->clkdm) { |
| ret = clkdm_clk_enable(clk->clkdm, hw->clk); |
| if (ret) { |
| WARN(1, "%s: could not enable %s's clockdomain %s: %d\n", |
| __func__, __clk_get_name(hw->clk), |
| clk->clkdm->name, ret); |
| return ret; |
| } |
| } |
| |
| if (unlikely(clk->enable_reg == NULL)) { |
| pr_err("%s: %s missing enable_reg\n", __func__, |
| __clk_get_name(hw->clk)); |
| ret = -EINVAL; |
| goto err; |
| } |
| |
| /* FIXME should not have INVERT_ENABLE bit here */ |
| v = omap2_clk_readl(clk, clk->enable_reg); |
| if (clk->flags & INVERT_ENABLE) |
| v &= ~(1 << clk->enable_bit); |
| else |
| v |= (1 << clk->enable_bit); |
| omap2_clk_writel(v, clk, clk->enable_reg); |
| v = omap2_clk_readl(clk, clk->enable_reg); /* OCP barrier */ |
| |
| if (clk->ops && clk->ops->find_idlest) |
| _omap2_module_wait_ready(clk); |
| |
| return 0; |
| |
| err: |
| if (clkdm_control && clk->clkdm) |
| clkdm_clk_disable(clk->clkdm, hw->clk); |
| return ret; |
| } |
| |
| /** |
| * omap2_dflt_clk_disable - disable a clock in the hardware |
| * @hw: struct clk_hw * of the clock to disable |
| * |
| * Disable the clock @hw in the hardware, and call into the OMAP |
| * clockdomain code to "disable" the corresponding clockdomain if all |
| * clocks/hwmods in that clockdomain are now disabled. No return |
| * value. |
| */ |
| void omap2_dflt_clk_disable(struct clk_hw *hw) |
| { |
| struct clk_hw_omap *clk; |
| u32 v; |
| |
| clk = to_clk_hw_omap(hw); |
| if (!clk->enable_reg) { |
| /* |
| * 'independent' here refers to a clock which is not |
| * controlled by its parent. |
| */ |
| pr_err("%s: independent clock %s has no enable_reg\n", |
| __func__, __clk_get_name(hw->clk)); |
| return; |
| } |
| |
| v = omap2_clk_readl(clk, clk->enable_reg); |
| if (clk->flags & INVERT_ENABLE) |
| v |= (1 << clk->enable_bit); |
| else |
| v &= ~(1 << clk->enable_bit); |
| omap2_clk_writel(v, clk, clk->enable_reg); |
| /* No OCP barrier needed here since it is a disable operation */ |
| |
| if (clkdm_control && clk->clkdm) |
| clkdm_clk_disable(clk->clkdm, hw->clk); |
| } |
| |
| /** |
| * omap2_clkops_enable_clkdm - increment usecount on clkdm of @hw |
| * @hw: struct clk_hw * of the clock being enabled |
| * |
| * Increment the usecount of the clockdomain of the clock pointed to |
| * by @hw; if the usecount is 1, the clockdomain will be "enabled." |
| * Only needed for clocks that don't use omap2_dflt_clk_enable() as |
| * their enable function pointer. Passes along the return value of |
| * clkdm_clk_enable(), -EINVAL if @hw is not associated with a |
| * clockdomain, or 0 if clock framework-based clockdomain control is |
| * not implemented. |
| */ |
| int omap2_clkops_enable_clkdm(struct clk_hw *hw) |
| { |
| struct clk_hw_omap *clk; |
| int ret = 0; |
| |
| clk = to_clk_hw_omap(hw); |
| |
| if (unlikely(!clk->clkdm)) { |
| pr_err("%s: %s: no clkdm set ?!\n", __func__, |
| __clk_get_name(hw->clk)); |
| return -EINVAL; |
| } |
| |
| if (unlikely(clk->enable_reg)) |
| pr_err("%s: %s: should use dflt_clk_enable ?!\n", __func__, |
| __clk_get_name(hw->clk)); |
| |
| if (!clkdm_control) { |
| pr_err("%s: %s: clkfw-based clockdomain control disabled ?!\n", |
| __func__, __clk_get_name(hw->clk)); |
| return 0; |
| } |
| |
| ret = clkdm_clk_enable(clk->clkdm, hw->clk); |
| WARN(ret, "%s: could not enable %s's clockdomain %s: %d\n", |
| __func__, __clk_get_name(hw->clk), clk->clkdm->name, ret); |
| |
| return ret; |
| } |
| |
| /** |
| * omap2_clkops_disable_clkdm - decrement usecount on clkdm of @hw |
| * @hw: struct clk_hw * of the clock being disabled |
| * |
| * Decrement the usecount of the clockdomain of the clock pointed to |
| * by @hw; if the usecount is 0, the clockdomain will be "disabled." |
| * Only needed for clocks that don't use omap2_dflt_clk_disable() as their |
| * disable function pointer. No return value. |
| */ |
| void omap2_clkops_disable_clkdm(struct clk_hw *hw) |
| { |
| struct clk_hw_omap *clk; |
| |
| clk = to_clk_hw_omap(hw); |
| |
| if (unlikely(!clk->clkdm)) { |
| pr_err("%s: %s: no clkdm set ?!\n", __func__, |
| __clk_get_name(hw->clk)); |
| return; |
| } |
| |
| if (unlikely(clk->enable_reg)) |
| pr_err("%s: %s: should use dflt_clk_disable ?!\n", __func__, |
| __clk_get_name(hw->clk)); |
| |
| if (!clkdm_control) { |
| pr_err("%s: %s: clkfw-based clockdomain control disabled ?!\n", |
| __func__, __clk_get_name(hw->clk)); |
| return; |
| } |
| |
| clkdm_clk_disable(clk->clkdm, hw->clk); |
| } |
| |
| /** |
| * omap2_dflt_clk_is_enabled - is clock enabled in the hardware? |
| * @hw: struct clk_hw * to check |
| * |
| * Return 1 if the clock represented by @hw is enabled in the |
| * hardware, or 0 otherwise. Intended for use in the struct |
| * clk_ops.is_enabled function pointer. |
| */ |
| int omap2_dflt_clk_is_enabled(struct clk_hw *hw) |
| { |
| struct clk_hw_omap *clk = to_clk_hw_omap(hw); |
| u32 v; |
| |
| v = omap2_clk_readl(clk, clk->enable_reg); |
| |
| if (clk->flags & INVERT_ENABLE) |
| v ^= BIT(clk->enable_bit); |
| |
| v &= BIT(clk->enable_bit); |
| |
| return v ? 1 : 0; |
| } |
| |
| static int __initdata mpurate; |
| |
| /* |
| * By default we use the rate set by the bootloader. |
| * You can override this with mpurate= cmdline option. |
| */ |
| static int __init omap_clk_setup(char *str) |
| { |
| get_option(&str, &mpurate); |
| |
| if (!mpurate) |
| return 1; |
| |
| if (mpurate < 1000) |
| mpurate *= 1000000; |
| |
| return 1; |
| } |
| __setup("mpurate=", omap_clk_setup); |
| |
| /** |
| * omap2_init_clk_hw_omap_clocks - initialize an OMAP clock |
| * @clk: struct clk * to initialize |
| * |
| * Add an OMAP clock @clk to the internal list of OMAP clocks. Used |
| * temporarily for autoidle handling, until this support can be |
| * integrated into the common clock framework code in some way. No |
| * return value. |
| */ |
| void omap2_init_clk_hw_omap_clocks(struct clk *clk) |
| { |
| struct clk_hw_omap *c; |
| |
| if (__clk_get_flags(clk) & CLK_IS_BASIC) |
| return; |
| |
| c = to_clk_hw_omap(__clk_get_hw(clk)); |
| list_add(&c->node, &clk_hw_omap_clocks); |
| } |
| |
| /** |
| * omap2_clk_enable_autoidle_all - enable autoidle on all OMAP clocks that |
| * support it |
| * |
| * Enable clock autoidle on all OMAP clocks that have allow_idle |
| * function pointers associated with them. This function is intended |
| * to be temporary until support for this is added to the common clock |
| * code. Returns 0. |
| */ |
| int omap2_clk_enable_autoidle_all(void) |
| { |
| struct clk_hw_omap *c; |
| |
| list_for_each_entry(c, &clk_hw_omap_clocks, node) |
| if (c->ops && c->ops->allow_idle) |
| c->ops->allow_idle(c); |
| |
| of_ti_clk_allow_autoidle_all(); |
| |
| return 0; |
| } |
| |
| /** |
| * omap2_clk_disable_autoidle_all - disable autoidle on all OMAP clocks that |
| * support it |
| * |
| * Disable clock autoidle on all OMAP clocks that have allow_idle |
| * function pointers associated with them. This function is intended |
| * to be temporary until support for this is added to the common clock |
| * code. Returns 0. |
| */ |
| int omap2_clk_disable_autoidle_all(void) |
| { |
| struct clk_hw_omap *c; |
| |
| list_for_each_entry(c, &clk_hw_omap_clocks, node) |
| if (c->ops && c->ops->deny_idle) |
| c->ops->deny_idle(c); |
| |
| of_ti_clk_deny_autoidle_all(); |
| |
| return 0; |
| } |
| |
| /** |
| * omap2_clk_deny_idle - disable autoidle on an OMAP clock |
| * @clk: struct clk * to disable autoidle for |
| * |
| * Disable autoidle on an OMAP clock. |
| */ |
| int omap2_clk_deny_idle(struct clk *clk) |
| { |
| struct clk_hw_omap *c; |
| |
| if (__clk_get_flags(clk) & CLK_IS_BASIC) |
| return -EINVAL; |
| |
| c = to_clk_hw_omap(__clk_get_hw(clk)); |
| if (c->ops && c->ops->deny_idle) |
| c->ops->deny_idle(c); |
| return 0; |
| } |
| |
| /** |
| * omap2_clk_allow_idle - enable autoidle on an OMAP clock |
| * @clk: struct clk * to enable autoidle for |
| * |
| * Enable autoidle on an OMAP clock. |
| */ |
| int omap2_clk_allow_idle(struct clk *clk) |
| { |
| struct clk_hw_omap *c; |
| |
| if (__clk_get_flags(clk) & CLK_IS_BASIC) |
| return -EINVAL; |
| |
| c = to_clk_hw_omap(__clk_get_hw(clk)); |
| if (c->ops && c->ops->allow_idle) |
| c->ops->allow_idle(c); |
| return 0; |
| } |
| |
| /** |
| * omap2_clk_enable_init_clocks - prepare & enable a list of clocks |
| * @clk_names: ptr to an array of strings of clock names to enable |
| * @num_clocks: number of clock names in @clk_names |
| * |
| * Prepare and enable a list of clocks, named by @clk_names. No |
| * return value. XXX Deprecated; only needed until these clocks are |
| * properly claimed and enabled by the drivers or core code that uses |
| * them. XXX What code disables & calls clk_put on these clocks? |
| */ |
| void omap2_clk_enable_init_clocks(const char **clk_names, u8 num_clocks) |
| { |
| struct clk *init_clk; |
| int i; |
| |
| for (i = 0; i < num_clocks; i++) { |
| init_clk = clk_get(NULL, clk_names[i]); |
| clk_prepare_enable(init_clk); |
| } |
| } |
| |
| const struct clk_hw_omap_ops clkhwops_wait = { |
| .find_idlest = omap2_clk_dflt_find_idlest, |
| .find_companion = omap2_clk_dflt_find_companion, |
| }; |
| |
| /** |
| * omap_clocks_register - register an array of omap_clk |
| * @ocs: pointer to an array of omap_clk to register |
| */ |
| void __init omap_clocks_register(struct omap_clk oclks[], int cnt) |
| { |
| struct omap_clk *c; |
| |
| for (c = oclks; c < oclks + cnt; c++) { |
| clkdev_add(&c->lk); |
| if (!__clk_init(NULL, c->lk.clk)) |
| omap2_init_clk_hw_omap_clocks(c->lk.clk); |
| } |
| } |
| |
| /** |
| * omap2_clk_switch_mpurate_at_boot - switch ARM MPU rate by boot-time argument |
| * @mpurate_ck_name: clk name of the clock to change rate |
| * |
| * Change the ARM MPU clock rate to the rate specified on the command |
| * line, if one was specified. @mpurate_ck_name should be |
| * "virt_prcm_set" on OMAP2xxx and "dpll1_ck" on OMAP34xx/OMAP36xx. |
| * XXX Does not handle voltage scaling - on OMAP2xxx this is currently |
| * handled by the virt_prcm_set clock, but this should be handled by |
| * the OPP layer. XXX This is intended to be handled by the OPP layer |
| * code in the near future and should be removed from the clock code. |
| * Returns -EINVAL if 'mpurate' is zero or if clk_set_rate() rejects |
| * the rate, -ENOENT if the struct clk referred to by @mpurate_ck_name |
| * cannot be found, or 0 upon success. |
| */ |
| int __init omap2_clk_switch_mpurate_at_boot(const char *mpurate_ck_name) |
| { |
| struct clk *mpurate_ck; |
| int r; |
| |
| if (!mpurate) |
| return -EINVAL; |
| |
| mpurate_ck = clk_get(NULL, mpurate_ck_name); |
| if (WARN(IS_ERR(mpurate_ck), "Failed to get %s.\n", mpurate_ck_name)) |
| return -ENOENT; |
| |
| r = clk_set_rate(mpurate_ck, mpurate); |
| if (r < 0) { |
| WARN(1, "clock: %s: unable to set MPU rate to %d: %d\n", |
| mpurate_ck_name, mpurate, r); |
| clk_put(mpurate_ck); |
| return -EINVAL; |
| } |
| |
| calibrate_delay(); |
| clk_put(mpurate_ck); |
| |
| return 0; |
| } |
| |
| /** |
| * omap2_clk_print_new_rates - print summary of current clock tree rates |
| * @hfclkin_ck_name: clk name for the off-chip HF oscillator |
| * @core_ck_name: clk name for the on-chip CORE_CLK |
| * @mpu_ck_name: clk name for the ARM MPU clock |
| * |
| * Prints a short message to the console with the HFCLKIN oscillator |
| * rate, the rate of the CORE clock, and the rate of the ARM MPU clock. |
| * Called by the boot-time MPU rate switching code. XXX This is intended |
| * to be handled by the OPP layer code in the near future and should be |
| * removed from the clock code. No return value. |
| */ |
| void __init omap2_clk_print_new_rates(const char *hfclkin_ck_name, |
| const char *core_ck_name, |
| const char *mpu_ck_name) |
| { |
| struct clk *hfclkin_ck, *core_ck, *mpu_ck; |
| unsigned long hfclkin_rate; |
| |
| mpu_ck = clk_get(NULL, mpu_ck_name); |
| if (WARN(IS_ERR(mpu_ck), "clock: failed to get %s.\n", mpu_ck_name)) |
| return; |
| |
| core_ck = clk_get(NULL, core_ck_name); |
| if (WARN(IS_ERR(core_ck), "clock: failed to get %s.\n", core_ck_name)) |
| return; |
| |
| hfclkin_ck = clk_get(NULL, hfclkin_ck_name); |
| if (WARN(IS_ERR(hfclkin_ck), "Failed to get %s.\n", hfclkin_ck_name)) |
| return; |
| |
| hfclkin_rate = clk_get_rate(hfclkin_ck); |
| |
| pr_info("Switched to new clocking rate (Crystal/Core/MPU): %ld.%01ld/%ld/%ld MHz\n", |
| (hfclkin_rate / 1000000), ((hfclkin_rate / 100000) % 10), |
| (clk_get_rate(core_ck) / 1000000), |
| (clk_get_rate(mpu_ck) / 1000000)); |
| } |