![Purna Chandra Mandal](/assets/img/avatar_default.png)
PIC32 clock driver is now implemented as platform driver instead of as part of of_clk_init(). It meants all the clock modules are available quite late in the boot sequence. So request for CPU clock by clk_get_sys() and clk_get_rate() to find c0_timer rate fails. To fix this use PIC32 specific early clock functions implemented for early console support. Signed-off-by: Purna Chandra Mandal <purna.mandal@microchip.com> Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Cc: Joshua Henderson <digitalpeer@digitalpeer.com> Patchwork: https://patchwork.linux-mips.org/patch/13262/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
/*
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* Joshua Henderson <joshua.henderson@microchip.com>
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* Copyright (C) 2015 Microchip Technology Inc. All rights reserved.
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*
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* This program is free software; you can distribute it and/or modify it
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* under the terms of the GNU General Public License (Version 2) as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include <linux/clk-provider.h>
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#include <linux/clocksource.h>
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#include <linux/init.h>
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#include <linux/irqdomain.h>
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#include <linux/of.h>
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#include <linux/of_irq.h>
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#include <asm/time.h>
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#include "pic32mzda.h"
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static const struct of_device_id pic32_infra_match[] = {
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{ .compatible = "microchip,pic32mzda-infra", },
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{ },
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};
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#define DEFAULT_CORE_TIMER_INTERRUPT 0
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static unsigned int pic32_xlate_core_timer_irq(void)
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{
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static struct device_node *node;
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unsigned int irq;
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node = of_find_matching_node(NULL, pic32_infra_match);
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if (WARN_ON(!node))
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goto default_map;
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irq = irq_of_parse_and_map(node, 0);
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if (!irq)
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goto default_map;
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return irq;
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default_map:
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return irq_create_mapping(NULL, DEFAULT_CORE_TIMER_INTERRUPT);
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}
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unsigned int get_c0_compare_int(void)
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{
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return pic32_xlate_core_timer_irq();
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}
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void __init plat_time_init(void)
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{
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unsigned long rate = pic32_get_pbclk(7);
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of_clk_init(NULL);
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pr_info("CPU Clock: %ldMHz\n", rate / 1000000);
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mips_hpt_frequency = rate / 2;
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clocksource_probe();
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}
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