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7029db09b2
SAMA7G5 supports DVFS by changing cpuck. On SAMA7G5 mck0 shares the same
parent with cpuck as seen in the following clock tree:
+----------> cpuck
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FRAC PLL ---> DIV PLL -+-> DIV ---> mck0
mck0 could go b/w 32KHz and 200MHz on SAMA7G5. To avoid mck0 overclocking
while changing FRAC PLL or DIV PLL the commit implements a notifier for
mck0 which applies a safe divider to register (maximum value of the divider
which is 5) on PRE_RATE_CHANGE events (such that changes on PLL to not
overclock mck0) and sets the maximum allowed rate on POST_RATE_CHANGE
events.
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20211011112719.3951784-13-claudiu.beznea@microchip.com
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
268 lines
8 KiB
C
268 lines
8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* drivers/clk/at91/pmc.h
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*
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* Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
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*/
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#ifndef __PMC_H_
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#define __PMC_H_
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#include <linux/io.h>
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#include <linux/irqdomain.h>
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#include <linux/regmap.h>
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#include <linux/spinlock.h>
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#include <dt-bindings/clock/at91.h>
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extern spinlock_t pmc_pcr_lock;
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struct pmc_data {
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unsigned int ncore;
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struct clk_hw **chws;
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unsigned int nsystem;
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struct clk_hw **shws;
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unsigned int nperiph;
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struct clk_hw **phws;
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unsigned int ngck;
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struct clk_hw **ghws;
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unsigned int npck;
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struct clk_hw **pchws;
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struct clk_hw *hwtable[];
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};
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struct clk_range {
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unsigned long min;
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unsigned long max;
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};
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#define CLK_RANGE(MIN, MAX) {.min = MIN, .max = MAX,}
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struct clk_master_layout {
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u32 offset;
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u32 mask;
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u8 pres_shift;
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};
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extern const struct clk_master_layout at91rm9200_master_layout;
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extern const struct clk_master_layout at91sam9x5_master_layout;
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struct clk_master_characteristics {
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struct clk_range output;
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u32 divisors[5];
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u8 have_div3_pres;
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};
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struct clk_pll_layout {
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u32 pllr_mask;
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u32 mul_mask;
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u32 frac_mask;
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u32 div_mask;
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u32 endiv_mask;
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u8 mul_shift;
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u8 frac_shift;
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u8 div_shift;
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u8 endiv_shift;
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};
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extern const struct clk_pll_layout at91rm9200_pll_layout;
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extern const struct clk_pll_layout at91sam9g45_pll_layout;
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extern const struct clk_pll_layout at91sam9g20_pllb_layout;
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extern const struct clk_pll_layout sama5d3_pll_layout;
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struct clk_pll_characteristics {
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struct clk_range input;
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int num_output;
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const struct clk_range *output;
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u16 *icpll;
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u8 *out;
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u8 upll : 1;
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};
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struct clk_programmable_layout {
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u8 pres_mask;
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u8 pres_shift;
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u8 css_mask;
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u8 have_slck_mck;
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u8 is_pres_direct;
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};
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extern const struct clk_programmable_layout at91rm9200_programmable_layout;
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extern const struct clk_programmable_layout at91sam9g45_programmable_layout;
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extern const struct clk_programmable_layout at91sam9x5_programmable_layout;
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struct clk_pcr_layout {
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u32 offset;
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u32 cmd;
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u32 div_mask;
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u32 gckcss_mask;
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u32 pid_mask;
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};
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/**
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* struct at91_clk_pms - Power management state for AT91 clock
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* @rate: clock rate
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* @parent_rate: clock parent rate
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* @status: clock status (enabled or disabled)
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* @parent: clock parent index
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*/
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struct at91_clk_pms {
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unsigned long rate;
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unsigned long parent_rate;
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unsigned int status;
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unsigned int parent;
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};
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#define field_get(_mask, _reg) (((_reg) & (_mask)) >> (ffs(_mask) - 1))
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#define field_prep(_mask, _val) (((_val) << (ffs(_mask) - 1)) & (_mask))
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#define ndck(a, s) (a[s - 1].id + 1)
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#define nck(a) (a[ARRAY_SIZE(a) - 1].id + 1)
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struct pmc_data *pmc_data_allocate(unsigned int ncore, unsigned int nsystem,
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unsigned int nperiph, unsigned int ngck,
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unsigned int npck);
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int of_at91_get_clk_range(struct device_node *np, const char *propname,
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struct clk_range *range);
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struct clk_hw *of_clk_hw_pmc_get(struct of_phandle_args *clkspec, void *data);
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struct clk_hw * __init
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at91_clk_register_audio_pll_frac(struct regmap *regmap, const char *name,
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const char *parent_name);
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struct clk_hw * __init
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at91_clk_register_audio_pll_pad(struct regmap *regmap, const char *name,
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const char *parent_name);
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struct clk_hw * __init
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at91_clk_register_audio_pll_pmc(struct regmap *regmap, const char *name,
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const char *parent_name);
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struct clk_hw * __init
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at91_clk_register_generated(struct regmap *regmap, spinlock_t *lock,
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const struct clk_pcr_layout *layout,
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const char *name, const char **parent_names,
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u32 *mux_table, u8 num_parents, u8 id,
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const struct clk_range *range, int chg_pid);
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struct clk_hw * __init
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at91_clk_register_h32mx(struct regmap *regmap, const char *name,
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const char *parent_name);
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struct clk_hw * __init
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at91_clk_i2s_mux_register(struct regmap *regmap, const char *name,
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const char * const *parent_names,
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unsigned int num_parents, u8 bus_id);
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struct clk_hw * __init
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at91_clk_register_main_rc_osc(struct regmap *regmap, const char *name,
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u32 frequency, u32 accuracy);
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struct clk_hw * __init
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at91_clk_register_main_osc(struct regmap *regmap, const char *name,
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const char *parent_name, bool bypass);
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struct clk_hw * __init
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at91_clk_register_rm9200_main(struct regmap *regmap,
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const char *name,
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const char *parent_name);
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struct clk_hw * __init
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at91_clk_register_sam9x5_main(struct regmap *regmap, const char *name,
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const char **parent_names, int num_parents);
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struct clk_hw * __init
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at91_clk_register_master_pres(struct regmap *regmap, const char *name,
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int num_parents, const char **parent_names,
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const struct clk_master_layout *layout,
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const struct clk_master_characteristics *characteristics,
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spinlock_t *lock, u32 flags, int chg_pid);
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struct clk_hw * __init
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at91_clk_register_master_div(struct regmap *regmap, const char *name,
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const char *parent_names,
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const struct clk_master_layout *layout,
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const struct clk_master_characteristics *characteristics,
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spinlock_t *lock, u32 flags, u32 safe_div);
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struct clk_hw * __init
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at91_clk_sama7g5_register_master(struct regmap *regmap,
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const char *name, int num_parents,
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const char **parent_names, u32 *mux_table,
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spinlock_t *lock, u8 id, bool critical,
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int chg_pid);
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struct clk_hw * __init
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at91_clk_register_peripheral(struct regmap *regmap, const char *name,
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const char *parent_name, u32 id);
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struct clk_hw * __init
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at91_clk_register_sam9x5_peripheral(struct regmap *regmap, spinlock_t *lock,
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const struct clk_pcr_layout *layout,
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const char *name, const char *parent_name,
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u32 id, const struct clk_range *range,
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int chg_pid);
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struct clk_hw * __init
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at91_clk_register_pll(struct regmap *regmap, const char *name,
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const char *parent_name, u8 id,
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const struct clk_pll_layout *layout,
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const struct clk_pll_characteristics *characteristics);
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struct clk_hw * __init
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at91_clk_register_plldiv(struct regmap *regmap, const char *name,
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const char *parent_name);
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struct clk_hw * __init
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sam9x60_clk_register_div_pll(struct regmap *regmap, spinlock_t *lock,
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const char *name, const char *parent_name, u8 id,
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const struct clk_pll_characteristics *characteristics,
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const struct clk_pll_layout *layout, u32 flags,
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u32 safe_div);
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struct clk_hw * __init
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sam9x60_clk_register_frac_pll(struct regmap *regmap, spinlock_t *lock,
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const char *name, const char *parent_name,
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struct clk_hw *parent_hw, u8 id,
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const struct clk_pll_characteristics *characteristics,
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const struct clk_pll_layout *layout, u32 flags);
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struct clk_hw * __init
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at91_clk_register_programmable(struct regmap *regmap, const char *name,
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const char **parent_names, u8 num_parents, u8 id,
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const struct clk_programmable_layout *layout,
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u32 *mux_table);
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struct clk_hw * __init
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at91_clk_register_sam9260_slow(struct regmap *regmap,
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const char *name,
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const char **parent_names,
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int num_parents);
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struct clk_hw * __init
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at91sam9x5_clk_register_smd(struct regmap *regmap, const char *name,
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const char **parent_names, u8 num_parents);
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struct clk_hw * __init
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at91_clk_register_system(struct regmap *regmap, const char *name,
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const char *parent_name, u8 id);
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struct clk_hw * __init
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at91sam9x5_clk_register_usb(struct regmap *regmap, const char *name,
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const char **parent_names, u8 num_parents);
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struct clk_hw * __init
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at91sam9n12_clk_register_usb(struct regmap *regmap, const char *name,
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const char *parent_name);
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struct clk_hw * __init
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sam9x60_clk_register_usb(struct regmap *regmap, const char *name,
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const char **parent_names, u8 num_parents);
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struct clk_hw * __init
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at91rm9200_clk_register_usb(struct regmap *regmap, const char *name,
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const char *parent_name, const u32 *divisors);
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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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struct clk_hw * __init
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at91_clk_sama7g5_register_utmi(struct regmap *regmap, const char *name,
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const char *parent_name);
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#endif /* __PMC_H_ */
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