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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/drivers/clk/at91/pmc.h

76 строки
1.9 KiB
C
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clk: at91: add PMC base support This patch adds at91 PMC (Power Management Controller) base support. All at91 clocks managed by the PMC unit will use this framework. This framework provides the following fonctionalities: - define a new struct at91_pmc to hide PMC internals (lock, PMC memory mapping, irq domain, ...) - read/write helper functions (pmc_read/write) to access PMC registers - lock/unlock helper functions (pmc_lock/unlock) to lock/unlock access to pmc registers - a new irq domain and its associated irq chip to request PMC specific interrupts (useful for clk prepare callbacks) The PMC unit is declared as a dt clk provider (CLK_OF_DECLARE), and every clk using this framework will declare a table of of_at91_clk_init_cb_t and add it to the pmc_clk_ids table. When the pmc dt clock setup function is called (by of_clk_init function), it triggers the registration of every supported child clk (those matching the definitions in pmc_clk_ids). This patch copies at91_pmc_base (memory mapping) and at91sam9_idle (function) from arch/arm/mach-at91/clock.c (which is not compiled if COMMON_CLK_AT91 is enabled). Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com> Acked-by: Mike Turquette <mturquette@linaro.org> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
2013-12-02 18:07:02 +04:00
/*
* drivers/clk/at91/pmc.h
*
* Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#ifndef __PMC_H_
#define __PMC_H_
#include <linux/io.h>
#include <linux/irqdomain.h>
#include <linux/spinlock.h>
struct clk_range {
unsigned long min;
unsigned long max;
};
#define CLK_RANGE(MIN, MAX) {.min = MIN, .max = MAX,}
struct at91_pmc_caps {
u32 available_irqs;
};
struct at91_pmc {
void __iomem *regbase;
int virq;
spinlock_t lock;
const struct at91_pmc_caps *caps;
struct irq_domain *irqdomain;
};
static inline void pmc_lock(struct at91_pmc *pmc)
{
spin_lock(&pmc->lock);
}
static inline void pmc_unlock(struct at91_pmc *pmc)
{
spin_unlock(&pmc->lock);
}
static inline u32 pmc_read(struct at91_pmc *pmc, int offset)
{
return readl(pmc->regbase + offset);
}
static inline void pmc_write(struct at91_pmc *pmc, int offset, u32 value)
{
writel(value, pmc->regbase + offset);
}
int of_at91_get_clk_range(struct device_node *np, const char *propname,
struct clk_range *range);
clk: at91: add PMC main clock This patch adds new at91 main oscillator clock implementation using common clk framework. If rate is not provided during clock registration it is calculated using the slow clock (main clk parent in this case) rate and MCFR register. Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com> Acked-by: Mike Turquette <mturquette@linaro.org> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
2013-10-11 12:44:49 +04:00
extern void __init of_at91rm9200_clk_main_setup(struct device_node *np,
struct at91_pmc *pmc);
clk: at91: add PMC pll clocks This patch adds new at91 pll clock implementation using common clk framework. The pll clock layout describe the PLLX register layout. There are four pll clock layouts: - at91rm9200 - at91sam9g20 - at91sam9g45 - sama5d3 PLL clocks are given characteristics: - min/max clock source rate - ranges of valid clock output rates - values to set in out and icpll fields for each supported output range These characteristics are checked during rate change to avoid over/underclocking. These characteristics are described in atmel's SoC datasheet in "Electrical Characteristics" paragraph. Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com> Acked-by: Mike Turquette <mturquette@linaro.org> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
2013-10-11 12:48:26 +04:00
extern void __init of_at91rm9200_clk_pll_setup(struct device_node *np,
struct at91_pmc *pmc);
extern void __init of_at91sam9g45_clk_pll_setup(struct device_node *np,
struct at91_pmc *pmc);
extern void __init of_at91sam9g20_clk_pllb_setup(struct device_node *np,
struct at91_pmc *pmc);
extern void __init of_sama5d3_clk_pll_setup(struct device_node *np,
struct at91_pmc *pmc);
extern void __init of_at91sam9x5_clk_plldiv_setup(struct device_node *np,
struct at91_pmc *pmc);
clk: at91: add PMC base support This patch adds at91 PMC (Power Management Controller) base support. All at91 clocks managed by the PMC unit will use this framework. This framework provides the following fonctionalities: - define a new struct at91_pmc to hide PMC internals (lock, PMC memory mapping, irq domain, ...) - read/write helper functions (pmc_read/write) to access PMC registers - lock/unlock helper functions (pmc_lock/unlock) to lock/unlock access to pmc registers - a new irq domain and its associated irq chip to request PMC specific interrupts (useful for clk prepare callbacks) The PMC unit is declared as a dt clk provider (CLK_OF_DECLARE), and every clk using this framework will declare a table of of_at91_clk_init_cb_t and add it to the pmc_clk_ids table. When the pmc dt clock setup function is called (by of_clk_init function), it triggers the registration of every supported child clk (those matching the definitions in pmc_clk_ids). This patch copies at91_pmc_base (memory mapping) and at91sam9_idle (function) from arch/arm/mach-at91/clock.c (which is not compiled if COMMON_CLK_AT91 is enabled). Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com> Acked-by: Mike Turquette <mturquette@linaro.org> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
2013-12-02 18:07:02 +04:00
#endif /* __PMC_H_ */