forked from luck/tmp_suning_uos_patched
37f286e908
Tero Kristo to move things a bit closer to becoming a proper device driver. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJUYkHXAAoJEBvUPslcq6Vz0CQP/2SUPXiq5/WXIe0Q1g4V1BmD KQ8Jc9+DHbx3+7PBaG9QwKkPwI9f7xykNYnvqvanwU3FEqIeckL7yvkwZiN68zye 5QbBNPcco2X8mbs6PahDhkRcs5pUSAeqHkxB9hUipP9u0Np1MzmPV0pyltB0CyE4 6TI+F1u57HqqyyioeLdiyOTlIYQucfhqGitMMzgw7Z+YjcqUQBObKiu3f5xWj9kM W9EB2APsY9h9D9OXwz4SmVAV1J6vdCtMkZtPmDdFTlj8Fy3qMd/B7gqRMuTcQcTK L5LMu+n58e4jiuA0So4Hz9DcH+sM/Ui06bNWBFuZ69IGKSWpHKzwDn/tE6+r8cvq oKvdL6Tu3lJv0fa8M1R1JJWYkvZCKGIhiIUc2kMjOYY+Ds8+82M/P3ng0RvPRhAQ 38HA0RjNSlsxhrpY8iFLcme+brHmuneaH/Ekthv+U66Kwfn3mZGJHl+Z5suo4Wu8 ySdjpqh4g5MZeWF2o95P7pTFNT5nopzh3vbLvhRYCChRFenBxrzbcQXarf3LMgbG MVN1c4t1L9fK9bJoOF3kul9X+LsWdtMak6mMesN4RjlY/8X6cI3sfj4ptVJZRdz5 Vq1GPuouSzJ8dHR+tG5l4h9IQc9LrMtt/dVQrTQlvQF0jPP2RVxCWMnvdIG3SmoM fEN/GFYRZslx7uT2hhsg =r4xr -----END PGP SIGNATURE----- Merge tag 'omap-for-v3.19/prcm-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap into next/soc Pull "omap prcm clean-up for v3.19" from Tony Lindgren: Clean-up series for omap PRCM (Power Reset Clock Module) from Tero Kristo to move things a bit closer to becoming a proper device driver. * tag 'omap-for-v3.19/prcm-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap: (26 commits) ARM: OMAP2+: PRM: provide generic API for system reset ARM: OMAP3+: PRM: add generic API for reconfiguring I/O chain ARM: OMAP4: PRM: make PRCM interrupt handler related functions static ARM: OMAP3: PRM: make PRCM interrupt handler related functions static ARM: OMAP4: PRM: make omap4_prm_read/write_inst_reg calls static ARM: AM33xx: PRM: make direct register access functions static ARM: AM33xx: PRM: move global warm reset implementation to driver ARM: OMAP4+: CM: remove omap4_cm1/cm2_* functions ARM: OMAP4: CM: make cminst direct register access functions static ARM: OMAP4: CM: move public definitions from cminst44xx.h to cm44xx.h ARM: OMAP2+: PRM: add generic API for checking hardreset status ARM: OMAP2+: PRM: add generic API for deasserting hardware reset ARM: OMAP2+: PRM: add generic API for asserting hardware reset ARM: AM33xx: PRM: add support for prm_init ARM: AM43xx: hwmod: use OMAP4 hardreset ops instead of the AM33xx version ARM: AM33xx: hwmod: remove am33xx specific module SoC opts ARM: OMAP2/3: CM: make cm_split_idlest_reg SoC calls static ARM: OMAP2+: CM: add common APIs for cm_module_enable/disable ARM: OMAP2+: CM: make clkdm_hwsup operations static ARM: OMAP4+/AM33xx: CM: add common API for cm_wait_module_idle ... Signed-off-by: Arnd Bergmann <arnd@arndb.de>
780 lines
22 KiB
C
780 lines
22 KiB
C
/*
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* linux/arch/arm/mach-omap2/clock.c
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*
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* Copyright (C) 2005-2008 Texas Instruments, Inc.
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* Copyright (C) 2004-2010 Nokia Corporation
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*
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* Contacts:
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* Richard Woodruff <r-woodruff2@ti.com>
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* Paul Walmsley
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#undef DEBUG
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/list.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/delay.h>
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#include <linux/clk-provider.h>
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#include <linux/io.h>
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#include <linux/bitops.h>
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#include <linux/clk-private.h>
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#include <asm/cpu.h>
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#include <trace/events/power.h>
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#include "soc.h"
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#include "clockdomain.h"
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#include "clock.h"
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#include "cm.h"
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#include "cm2xxx.h"
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#include "cm3xxx.h"
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#include "cm-regbits-24xx.h"
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#include "cm-regbits-34xx.h"
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#include "common.h"
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/*
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* MAX_MODULE_ENABLE_WAIT: maximum of number of microseconds to wait
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* for a module to indicate that it is no longer in idle
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*/
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#define MAX_MODULE_ENABLE_WAIT 100000
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u16 cpu_mask;
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/*
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* Clock features setup. Used instead of CPU type checks.
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*/
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struct ti_clk_features ti_clk_features;
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/* DPLL valid Fint frequency band limits - from 34xx TRM Section 4.7.6.2 */
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#define OMAP3430_DPLL_FINT_BAND1_MIN 750000
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#define OMAP3430_DPLL_FINT_BAND1_MAX 2100000
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#define OMAP3430_DPLL_FINT_BAND2_MIN 7500000
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#define OMAP3430_DPLL_FINT_BAND2_MAX 21000000
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/*
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* DPLL valid Fint frequency range for OMAP36xx and OMAP4xxx.
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* From device data manual section 4.3 "DPLL and DLL Specifications".
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*/
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#define OMAP3PLUS_DPLL_FINT_MIN 32000
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#define OMAP3PLUS_DPLL_FINT_MAX 52000000
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/*
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* clkdm_control: if true, then when a clock is enabled in the
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* hardware, its clockdomain will first be enabled; and when a clock
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* is disabled in the hardware, its clockdomain will be disabled
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* afterwards.
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*/
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static bool clkdm_control = true;
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static LIST_HEAD(clk_hw_omap_clocks);
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void __iomem *clk_memmaps[CLK_MAX_MEMMAPS];
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void omap2_clk_writel(u32 val, struct clk_hw_omap *clk, void __iomem *reg)
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{
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if (clk->flags & MEMMAP_ADDRESSING) {
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struct clk_omap_reg *r = (struct clk_omap_reg *)®
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writel_relaxed(val, clk_memmaps[r->index] + r->offset);
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} else {
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writel_relaxed(val, reg);
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}
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}
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u32 omap2_clk_readl(struct clk_hw_omap *clk, void __iomem *reg)
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{
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u32 val;
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if (clk->flags & MEMMAP_ADDRESSING) {
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struct clk_omap_reg *r = (struct clk_omap_reg *)®
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val = readl_relaxed(clk_memmaps[r->index] + r->offset);
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} else {
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val = readl_relaxed(reg);
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}
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return val;
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}
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/*
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* OMAP2+ specific clock functions
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*/
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/* Private functions */
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/**
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* _wait_idlest_generic - wait for a module to leave the idle state
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* @clk: module clock to wait for (needed for register offsets)
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* @reg: virtual address of module IDLEST register
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* @mask: value to mask against to determine if the module is active
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* @idlest: idle state indicator (0 or 1) for the clock
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* @name: name of the clock (for printk)
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*
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* Wait for a module to leave idle, where its idle-status register is
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* not inside the CM module. Returns 1 if the module left idle
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* promptly, or 0 if the module did not leave idle before the timeout
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* elapsed. XXX Deprecated - should be moved into drivers for the
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* individual IP block that the IDLEST register exists in.
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*/
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static int _wait_idlest_generic(struct clk_hw_omap *clk, void __iomem *reg,
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u32 mask, u8 idlest, const char *name)
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{
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int i = 0, ena = 0;
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ena = (idlest) ? 0 : mask;
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omap_test_timeout(((omap2_clk_readl(clk, reg) & mask) == ena),
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MAX_MODULE_ENABLE_WAIT, i);
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if (i < MAX_MODULE_ENABLE_WAIT)
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pr_debug("omap clock: module associated with clock %s ready after %d loops\n",
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name, i);
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else
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pr_err("omap clock: module associated with clock %s didn't enable in %d tries\n",
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name, MAX_MODULE_ENABLE_WAIT);
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return (i < MAX_MODULE_ENABLE_WAIT) ? 1 : 0;
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};
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/**
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* _omap2_module_wait_ready - wait for an OMAP module to leave IDLE
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* @clk: struct clk * belonging to the module
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*
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* If the necessary clocks for the OMAP hardware IP block that
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* corresponds to clock @clk are enabled, then wait for the module to
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* indicate readiness (i.e., to leave IDLE). This code does not
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* belong in the clock code and will be moved in the medium term to
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* module-dependent code. No return value.
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*/
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static void _omap2_module_wait_ready(struct clk_hw_omap *clk)
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{
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void __iomem *companion_reg, *idlest_reg;
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u8 other_bit, idlest_bit, idlest_val, idlest_reg_id;
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s16 prcm_mod;
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int r;
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/* Not all modules have multiple clocks that their IDLEST depends on */
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if (clk->ops->find_companion) {
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clk->ops->find_companion(clk, &companion_reg, &other_bit);
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if (!(omap2_clk_readl(clk, companion_reg) & (1 << other_bit)))
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return;
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}
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clk->ops->find_idlest(clk, &idlest_reg, &idlest_bit, &idlest_val);
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r = cm_split_idlest_reg(idlest_reg, &prcm_mod, &idlest_reg_id);
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if (r) {
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/* IDLEST register not in the CM module */
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_wait_idlest_generic(clk, idlest_reg, (1 << idlest_bit),
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idlest_val, __clk_get_name(clk->hw.clk));
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} else {
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omap_cm_wait_module_ready(0, prcm_mod, idlest_reg_id,
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idlest_bit);
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};
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}
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/* Public functions */
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/**
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* omap2_init_clk_clkdm - look up a clockdomain name, store pointer in clk
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* @clk: OMAP clock struct ptr to use
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*
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* Convert a clockdomain name stored in a struct clk 'clk' into a
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* clockdomain pointer, and save it into the struct clk. Intended to be
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* called during clk_register(). No return value.
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*/
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void omap2_init_clk_clkdm(struct clk_hw *hw)
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{
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struct clk_hw_omap *clk = to_clk_hw_omap(hw);
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struct clockdomain *clkdm;
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const char *clk_name;
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if (!clk->clkdm_name)
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return;
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clk_name = __clk_get_name(hw->clk);
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clkdm = clkdm_lookup(clk->clkdm_name);
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if (clkdm) {
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pr_debug("clock: associated clk %s to clkdm %s\n",
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clk_name, clk->clkdm_name);
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clk->clkdm = clkdm;
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} else {
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pr_debug("clock: could not associate clk %s to clkdm %s\n",
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clk_name, clk->clkdm_name);
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}
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}
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/**
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* omap2_clk_disable_clkdm_control - disable clkdm control on clk enable/disable
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*
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* Prevent the OMAP clock code from calling into the clockdomain code
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* when a hardware clock in that clockdomain is enabled or disabled.
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* Intended to be called at init time from omap*_clk_init(). No
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* return value.
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*/
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void __init omap2_clk_disable_clkdm_control(void)
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{
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clkdm_control = false;
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}
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/**
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* omap2_clk_dflt_find_companion - find companion clock to @clk
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* @clk: struct clk * to find the companion clock of
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* @other_reg: void __iomem ** to return the companion clock CM_*CLKEN va in
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* @other_bit: u8 ** to return the companion clock bit shift in
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*
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* Note: We don't need special code here for INVERT_ENABLE for the
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* time being since INVERT_ENABLE only applies to clocks enabled by
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* CM_CLKEN_PLL
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*
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* Convert CM_ICLKEN* <-> CM_FCLKEN*. This conversion assumes it's
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* just a matter of XORing the bits.
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*
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* Some clocks don't have companion clocks. For example, modules with
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* only an interface clock (such as MAILBOXES) don't have a companion
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* clock. Right now, this code relies on the hardware exporting a bit
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* in the correct companion register that indicates that the
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* nonexistent 'companion clock' is active. Future patches will
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* associate this type of code with per-module data structures to
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* avoid this issue, and remove the casts. No return value.
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*/
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void omap2_clk_dflt_find_companion(struct clk_hw_omap *clk,
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void __iomem **other_reg, u8 *other_bit)
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{
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u32 r;
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/*
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* Convert CM_ICLKEN* <-> CM_FCLKEN*. This conversion assumes
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* it's just a matter of XORing the bits.
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*/
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r = ((__force u32)clk->enable_reg ^ (CM_FCLKEN ^ CM_ICLKEN));
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*other_reg = (__force void __iomem *)r;
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*other_bit = clk->enable_bit;
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}
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/**
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* omap2_clk_dflt_find_idlest - find CM_IDLEST reg va, bit shift for @clk
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* @clk: struct clk * to find IDLEST info for
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* @idlest_reg: void __iomem ** to return the CM_IDLEST va in
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* @idlest_bit: u8 * to return the CM_IDLEST bit shift in
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* @idlest_val: u8 * to return the idle status indicator
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*
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* Return the CM_IDLEST register address and bit shift corresponding
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* to the module that "owns" this clock. This default code assumes
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* that the CM_IDLEST bit shift is the CM_*CLKEN bit shift, and that
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* the IDLEST register address ID corresponds to the CM_*CLKEN
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* register address ID (e.g., that CM_FCLKEN2 corresponds to
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* CM_IDLEST2). This is not true for all modules. No return value.
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*/
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void omap2_clk_dflt_find_idlest(struct clk_hw_omap *clk,
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void __iomem **idlest_reg, u8 *idlest_bit, u8 *idlest_val)
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{
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u32 r;
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r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
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*idlest_reg = (__force void __iomem *)r;
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*idlest_bit = clk->enable_bit;
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/*
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* 24xx uses 0 to indicate not ready, and 1 to indicate ready.
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* 34xx reverses this, just to keep us on our toes
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* AM35xx uses both, depending on the module.
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*/
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*idlest_val = ti_clk_features.cm_idlest_val;
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}
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/**
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* omap2_dflt_clk_enable - enable a clock in the hardware
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* @hw: struct clk_hw * of the clock to enable
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*
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* Enable the clock @hw in the hardware. We first call into the OMAP
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* clockdomain code to "enable" the corresponding clockdomain if this
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* is the first enabled user of the clockdomain. Then program the
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* hardware to enable the clock. Then wait for the IP block that uses
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* this clock to leave idle (if applicable). Returns the error value
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* from clkdm_clk_enable() if it terminated with an error, or -EINVAL
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* if @hw has a null clock enable_reg, or zero upon success.
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*/
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int omap2_dflt_clk_enable(struct clk_hw *hw)
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{
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struct clk_hw_omap *clk;
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u32 v;
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int ret = 0;
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clk = to_clk_hw_omap(hw);
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if (clkdm_control && clk->clkdm) {
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ret = clkdm_clk_enable(clk->clkdm, hw->clk);
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if (ret) {
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WARN(1, "%s: could not enable %s's clockdomain %s: %d\n",
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__func__, __clk_get_name(hw->clk),
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clk->clkdm->name, ret);
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return ret;
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}
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}
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if (unlikely(clk->enable_reg == NULL)) {
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pr_err("%s: %s missing enable_reg\n", __func__,
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__clk_get_name(hw->clk));
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ret = -EINVAL;
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goto err;
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}
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/* FIXME should not have INVERT_ENABLE bit here */
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v = omap2_clk_readl(clk, clk->enable_reg);
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if (clk->flags & INVERT_ENABLE)
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v &= ~(1 << clk->enable_bit);
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else
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v |= (1 << clk->enable_bit);
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omap2_clk_writel(v, clk, clk->enable_reg);
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v = omap2_clk_readl(clk, clk->enable_reg); /* OCP barrier */
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if (clk->ops && clk->ops->find_idlest)
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_omap2_module_wait_ready(clk);
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return 0;
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err:
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if (clkdm_control && clk->clkdm)
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clkdm_clk_disable(clk->clkdm, hw->clk);
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return ret;
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}
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/**
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* omap2_dflt_clk_disable - disable a clock in the hardware
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* @hw: struct clk_hw * of the clock to disable
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*
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* Disable the clock @hw in the hardware, and call into the OMAP
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* clockdomain code to "disable" the corresponding clockdomain if all
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* clocks/hwmods in that clockdomain are now disabled. No return
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* value.
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*/
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void omap2_dflt_clk_disable(struct clk_hw *hw)
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{
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struct clk_hw_omap *clk;
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u32 v;
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clk = to_clk_hw_omap(hw);
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if (!clk->enable_reg) {
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/*
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* 'independent' here refers to a clock which is not
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* controlled by its parent.
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*/
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pr_err("%s: independent clock %s has no enable_reg\n",
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__func__, __clk_get_name(hw->clk));
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return;
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}
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v = omap2_clk_readl(clk, clk->enable_reg);
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if (clk->flags & INVERT_ENABLE)
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v |= (1 << clk->enable_bit);
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else
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v &= ~(1 << clk->enable_bit);
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omap2_clk_writel(v, clk, clk->enable_reg);
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/* No OCP barrier needed here since it is a disable operation */
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if (clkdm_control && clk->clkdm)
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clkdm_clk_disable(clk->clkdm, hw->clk);
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}
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/**
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* omap2_clkops_enable_clkdm - increment usecount on clkdm of @hw
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* @hw: struct clk_hw * of the clock being enabled
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*
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* Increment the usecount of the clockdomain of the clock pointed to
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* by @hw; if the usecount is 1, the clockdomain will be "enabled."
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* Only needed for clocks that don't use omap2_dflt_clk_enable() as
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* their enable function pointer. Passes along the return value of
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* clkdm_clk_enable(), -EINVAL if @hw is not associated with a
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* clockdomain, or 0 if clock framework-based clockdomain control is
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* not implemented.
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*/
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int omap2_clkops_enable_clkdm(struct clk_hw *hw)
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{
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struct clk_hw_omap *clk;
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int ret = 0;
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clk = to_clk_hw_omap(hw);
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if (unlikely(!clk->clkdm)) {
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pr_err("%s: %s: no clkdm set ?!\n", __func__,
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__clk_get_name(hw->clk));
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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));
|
|
}
|
|
|
|
/**
|
|
* ti_clk_init_features - init clock features struct for the SoC
|
|
*
|
|
* Initializes the clock features struct based on the SoC type.
|
|
*/
|
|
void __init ti_clk_init_features(void)
|
|
{
|
|
/* Fint setup for DPLLs */
|
|
if (cpu_is_omap3430()) {
|
|
ti_clk_features.fint_min = OMAP3430_DPLL_FINT_BAND1_MIN;
|
|
ti_clk_features.fint_max = OMAP3430_DPLL_FINT_BAND2_MAX;
|
|
ti_clk_features.fint_band1_max = OMAP3430_DPLL_FINT_BAND1_MAX;
|
|
ti_clk_features.fint_band2_min = OMAP3430_DPLL_FINT_BAND2_MIN;
|
|
} else {
|
|
ti_clk_features.fint_min = OMAP3PLUS_DPLL_FINT_MIN;
|
|
ti_clk_features.fint_max = OMAP3PLUS_DPLL_FINT_MAX;
|
|
}
|
|
|
|
/* Bypass value setup for DPLLs */
|
|
if (cpu_is_omap24xx()) {
|
|
ti_clk_features.dpll_bypass_vals |=
|
|
(1 << OMAP2XXX_EN_DPLL_LPBYPASS) |
|
|
(1 << OMAP2XXX_EN_DPLL_FRBYPASS);
|
|
} else if (cpu_is_omap34xx()) {
|
|
ti_clk_features.dpll_bypass_vals |=
|
|
(1 << OMAP3XXX_EN_DPLL_LPBYPASS) |
|
|
(1 << OMAP3XXX_EN_DPLL_FRBYPASS);
|
|
} else if (soc_is_am33xx() || cpu_is_omap44xx() || soc_is_am43xx() ||
|
|
soc_is_omap54xx() || soc_is_dra7xx()) {
|
|
ti_clk_features.dpll_bypass_vals |=
|
|
(1 << OMAP4XXX_EN_DPLL_LPBYPASS) |
|
|
(1 << OMAP4XXX_EN_DPLL_FRBYPASS) |
|
|
(1 << OMAP4XXX_EN_DPLL_MNBYPASS);
|
|
}
|
|
|
|
/* Jitter correction only available on OMAP343X */
|
|
if (cpu_is_omap343x())
|
|
ti_clk_features.flags |= TI_CLK_DPLL_HAS_FREQSEL;
|
|
|
|
/* Idlest value for interface clocks.
|
|
* 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())
|
|
ti_clk_features.cm_idlest_val = OMAP24XX_CM_IDLEST_VAL;
|
|
else if (cpu_is_omap34xx())
|
|
ti_clk_features.cm_idlest_val = OMAP34XX_CM_IDLEST_VAL;
|
|
|
|
/* On OMAP3430 ES1.0, DPLL4 can't be re-programmed */
|
|
if (omap_rev() == OMAP3430_REV_ES1_0)
|
|
ti_clk_features.flags |= TI_CLK_DPLL4_DENY_REPROGRAM;
|
|
}
|