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![Alexandre Belloni](/assets/img/avatar_default.png)
The CLK_IGNORE_UNUSED flag was added on all the system clocks because of the ddrck. Now that it is handled by the ram controller driver, we can drop it. Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
183 lines
3.9 KiB
C
183 lines
3.9 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/of_address.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/of_irq.h>
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#include <linux/interrupt.h>
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#include <linux/wait.h>
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#include <linux/sched.h>
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#include "pmc.h"
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#define SYSTEM_MAX_ID 31
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#define SYSTEM_MAX_NAME_SZ 32
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#define to_clk_system(hw) container_of(hw, struct clk_system, hw)
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struct clk_system {
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struct clk_hw hw;
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struct at91_pmc *pmc;
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unsigned int irq;
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wait_queue_head_t wait;
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u8 id;
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};
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static inline int is_pck(int id)
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{
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return (id >= 8) && (id <= 15);
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}
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static irqreturn_t clk_system_irq_handler(int irq, void *dev_id)
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{
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struct clk_system *sys = (struct clk_system *)dev_id;
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wake_up(&sys->wait);
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disable_irq_nosync(sys->irq);
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return IRQ_HANDLED;
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}
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static int clk_system_prepare(struct clk_hw *hw)
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{
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struct clk_system *sys = to_clk_system(hw);
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struct at91_pmc *pmc = sys->pmc;
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u32 mask = 1 << sys->id;
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pmc_write(pmc, AT91_PMC_SCER, mask);
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if (!is_pck(sys->id))
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return 0;
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while (!(pmc_read(pmc, AT91_PMC_SR) & mask)) {
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if (sys->irq) {
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enable_irq(sys->irq);
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wait_event(sys->wait,
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pmc_read(pmc, AT91_PMC_SR) & mask);
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} else
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cpu_relax();
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}
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return 0;
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}
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static void clk_system_unprepare(struct clk_hw *hw)
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{
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struct clk_system *sys = to_clk_system(hw);
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struct at91_pmc *pmc = sys->pmc;
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pmc_write(pmc, AT91_PMC_SCDR, 1 << sys->id);
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}
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static int clk_system_is_prepared(struct clk_hw *hw)
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{
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struct clk_system *sys = to_clk_system(hw);
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struct at91_pmc *pmc = sys->pmc;
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if (!(pmc_read(pmc, AT91_PMC_SCSR) & (1 << sys->id)))
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return 0;
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if (!is_pck(sys->id))
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return 1;
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return !!(pmc_read(pmc, AT91_PMC_SR) & (1 << sys->id));
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}
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static const struct clk_ops system_ops = {
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.prepare = clk_system_prepare,
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.unprepare = clk_system_unprepare,
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.is_prepared = clk_system_is_prepared,
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};
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static struct clk * __init
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at91_clk_register_system(struct at91_pmc *pmc, const char *name,
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const char *parent_name, u8 id, int irq)
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{
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struct clk_system *sys;
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struct clk *clk = NULL;
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struct clk_init_data init;
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int ret;
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if (!parent_name || id > SYSTEM_MAX_ID)
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return ERR_PTR(-EINVAL);
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sys = kzalloc(sizeof(*sys), GFP_KERNEL);
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if (!sys)
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return ERR_PTR(-ENOMEM);
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init.name = name;
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init.ops = &system_ops;
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init.parent_names = &parent_name;
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init.num_parents = 1;
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init.flags = CLK_SET_RATE_PARENT;
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sys->id = id;
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sys->hw.init = &init;
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sys->pmc = pmc;
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sys->irq = irq;
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if (irq) {
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init_waitqueue_head(&sys->wait);
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irq_set_status_flags(sys->irq, IRQ_NOAUTOEN);
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ret = request_irq(sys->irq, clk_system_irq_handler,
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IRQF_TRIGGER_HIGH, name, sys);
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if (ret)
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return ERR_PTR(ret);
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}
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clk = clk_register(NULL, &sys->hw);
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if (IS_ERR(clk))
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kfree(sys);
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return clk;
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}
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static void __init
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of_at91_clk_sys_setup(struct device_node *np, struct at91_pmc *pmc)
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{
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int num;
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int irq = 0;
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u32 id;
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struct clk *clk;
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const char *name;
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struct device_node *sysclknp;
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const char *parent_name;
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num = of_get_child_count(np);
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if (num > (SYSTEM_MAX_ID + 1))
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return;
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for_each_child_of_node(np, sysclknp) {
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if (of_property_read_u32(sysclknp, "reg", &id))
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continue;
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if (of_property_read_string(np, "clock-output-names", &name))
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name = sysclknp->name;
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if (is_pck(id))
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irq = irq_of_parse_and_map(sysclknp, 0);
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parent_name = of_clk_get_parent_name(sysclknp, 0);
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clk = at91_clk_register_system(pmc, name, parent_name, id, irq);
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if (IS_ERR(clk))
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continue;
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of_clk_add_provider(sysclknp, of_clk_src_simple_get, clk);
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}
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}
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void __init of_at91rm9200_clk_sys_setup(struct device_node *np,
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struct at91_pmc *pmc)
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{
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of_at91_clk_sys_setup(np, pmc);
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}
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