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92041a9ff0
By default, it is assumed that the UTMI clock is generated from a 12 MHz reference clock (MAINCK). If it's not the case, the FREQ field of the SFR_UTMICKTRIM has to be updated to generate the UTMI clock in the proper way. The UTMI clock has a fixed rate of 480 MHz. In fact, there is no multiplier we can configure. The multiplier is managed internally, depending on the reference clock frequency, to achieve the target of 480 MHz. Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com> Acked-by: Ingo van Lil <inguin@gmx.de> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
203 lines
4.9 KiB
C
203 lines
4.9 KiB
C
/*
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* Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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*/
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#include <linux/clk-provider.h>
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#include <linux/clkdev.h>
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#include <linux/clk/at91_pmc.h>
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#include <linux/of.h>
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#include <linux/mfd/syscon.h>
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#include <linux/regmap.h>
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#include <soc/at91/atmel-sfr.h>
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#include "pmc.h"
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/*
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* The purpose of this clock is to generate a 480 MHz signal. A different
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* rate can't be configured.
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*/
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#define UTMI_RATE 480000000
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struct clk_utmi {
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struct clk_hw hw;
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struct regmap *regmap_pmc;
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struct regmap *regmap_sfr;
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};
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#define to_clk_utmi(hw) container_of(hw, struct clk_utmi, hw)
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static inline bool clk_utmi_ready(struct regmap *regmap)
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{
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unsigned int status;
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regmap_read(regmap, AT91_PMC_SR, &status);
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return status & AT91_PMC_LOCKU;
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}
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static int clk_utmi_prepare(struct clk_hw *hw)
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{
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struct clk_hw *hw_parent;
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struct clk_utmi *utmi = to_clk_utmi(hw);
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unsigned int uckr = AT91_PMC_UPLLEN | AT91_PMC_UPLLCOUNT |
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AT91_PMC_BIASEN;
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unsigned int utmi_ref_clk_freq;
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unsigned long parent_rate;
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/*
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* If mainck rate is different from 12 MHz, we have to configure the
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* FREQ field of the SFR_UTMICKTRIM register to generate properly
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* the utmi clock.
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*/
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hw_parent = clk_hw_get_parent(hw);
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parent_rate = clk_hw_get_rate(hw_parent);
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switch (parent_rate) {
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case 12000000:
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utmi_ref_clk_freq = 0;
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break;
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case 16000000:
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utmi_ref_clk_freq = 1;
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break;
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case 24000000:
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utmi_ref_clk_freq = 2;
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break;
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/*
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* Not supported on SAMA5D2 but it's not an issue since MAINCK
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* maximum value is 24 MHz.
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*/
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case 48000000:
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utmi_ref_clk_freq = 3;
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break;
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default:
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pr_err("UTMICK: unsupported mainck rate\n");
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return -EINVAL;
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}
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if (utmi->regmap_sfr) {
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regmap_update_bits(utmi->regmap_sfr, AT91_SFR_UTMICKTRIM,
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AT91_UTMICKTRIM_FREQ, utmi_ref_clk_freq);
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} else if (utmi_ref_clk_freq) {
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pr_err("UTMICK: sfr node required\n");
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return -EINVAL;
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}
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regmap_update_bits(utmi->regmap_pmc, AT91_CKGR_UCKR, uckr, uckr);
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while (!clk_utmi_ready(utmi->regmap_pmc))
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cpu_relax();
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return 0;
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}
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static int clk_utmi_is_prepared(struct clk_hw *hw)
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{
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struct clk_utmi *utmi = to_clk_utmi(hw);
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return clk_utmi_ready(utmi->regmap_pmc);
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}
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static void clk_utmi_unprepare(struct clk_hw *hw)
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{
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struct clk_utmi *utmi = to_clk_utmi(hw);
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regmap_update_bits(utmi->regmap_pmc, AT91_CKGR_UCKR,
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AT91_PMC_UPLLEN, 0);
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}
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static unsigned long clk_utmi_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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/* UTMI clk rate is fixed. */
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return UTMI_RATE;
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}
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static const struct clk_ops utmi_ops = {
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.prepare = clk_utmi_prepare,
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.unprepare = clk_utmi_unprepare,
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.is_prepared = clk_utmi_is_prepared,
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.recalc_rate = clk_utmi_recalc_rate,
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};
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static struct clk_hw * __init
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at91_clk_register_utmi(struct regmap *regmap_pmc, struct regmap *regmap_sfr,
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const char *name, const char *parent_name)
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{
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struct clk_utmi *utmi;
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struct clk_hw *hw;
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struct clk_init_data init;
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int ret;
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utmi = kzalloc(sizeof(*utmi), GFP_KERNEL);
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if (!utmi)
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return ERR_PTR(-ENOMEM);
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init.name = name;
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init.ops = &utmi_ops;
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init.parent_names = parent_name ? &parent_name : NULL;
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init.num_parents = parent_name ? 1 : 0;
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init.flags = CLK_SET_RATE_GATE;
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utmi->hw.init = &init;
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utmi->regmap_pmc = regmap_pmc;
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utmi->regmap_sfr = regmap_sfr;
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hw = &utmi->hw;
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ret = clk_hw_register(NULL, &utmi->hw);
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if (ret) {
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kfree(utmi);
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hw = ERR_PTR(ret);
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}
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return hw;
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}
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static void __init of_at91sam9x5_clk_utmi_setup(struct device_node *np)
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{
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struct clk_hw *hw;
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const char *parent_name;
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const char *name = np->name;
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struct regmap *regmap_pmc, *regmap_sfr;
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parent_name = of_clk_get_parent_name(np, 0);
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of_property_read_string(np, "clock-output-names", &name);
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regmap_pmc = syscon_node_to_regmap(of_get_parent(np));
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if (IS_ERR(regmap_pmc))
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return;
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/*
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* If the device supports different mainck rates, this value has to be
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* set in the UTMI Clock Trimming register.
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* - 9x5: mainck supports several rates but it is indicated that a
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* 12 MHz is needed in case of USB.
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* - sama5d3 and sama5d2: mainck supports several rates. Configuring
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* the FREQ field of the UTMI Clock Trimming register is mandatory.
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* - sama5d4: mainck is at 12 MHz.
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*
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* We only need to retrieve sama5d3 or sama5d2 sfr regmap.
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*/
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regmap_sfr = syscon_regmap_lookup_by_compatible("atmel,sama5d3-sfr");
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if (IS_ERR(regmap_sfr)) {
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regmap_sfr = syscon_regmap_lookup_by_compatible("atmel,sama5d2-sfr");
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if (IS_ERR(regmap_sfr))
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regmap_sfr = NULL;
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}
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hw = at91_clk_register_utmi(regmap_pmc, regmap_sfr, name, parent_name);
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if (IS_ERR(hw))
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return;
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of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw);
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return;
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}
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CLK_OF_DECLARE(at91sam9x5_clk_utmi, "atmel,at91sam9x5-clk-utmi",
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of_at91sam9x5_clk_utmi_setup);
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