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0ad6125b15
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>
62 lines
1.3 KiB
C
62 lines
1.3 KiB
C
/*
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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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* 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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#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/spinlock.h>
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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 at91_pmc_caps {
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u32 available_irqs;
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};
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struct at91_pmc {
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void __iomem *regbase;
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int virq;
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spinlock_t lock;
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const struct at91_pmc_caps *caps;
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struct irq_domain *irqdomain;
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};
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static inline void pmc_lock(struct at91_pmc *pmc)
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{
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spin_lock(&pmc->lock);
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}
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static inline void pmc_unlock(struct at91_pmc *pmc)
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{
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spin_unlock(&pmc->lock);
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}
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static inline u32 pmc_read(struct at91_pmc *pmc, int offset)
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{
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return readl(pmc->regbase + offset);
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}
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static inline void pmc_write(struct at91_pmc *pmc, int offset, u32 value)
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{
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writel(value, pmc->regbase + offset);
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}
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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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#endif /* __PMC_H_ */
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