77cf5166f2
As of commit 9a1091ef00 ("irqchip: gic: Support hierarchy irq
domain."), the Lager legacy board support is known to be broken.
The IRQ numbers of the GIC are now virtual, and no longer match the
hardcoded hardware IRQ numbers in the legacy platform board code.
To fix this issue specific to non-multiplatform r8a7790 and Lager:
1) Instantiate the GIC from platform board code and also
2) Skip over the DT arch timer as well as
3) Force delay setup based on DT CPU frequency
With these 3 fixes in place interrupts on Lager are now unbroken.
Partially based on legacy GIC fix by Geert Uytterhoeven, thanks to
him for the initial work.
Signed-off-by: Magnus Damm <damm+renesas@opensource.se>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
117 lines
3.4 KiB
C
117 lines
3.4 KiB
C
/*
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* SH-Mobile Timer
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*
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* Copyright (C) 2010 Magnus Damm
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* Copyright (C) 2002 - 2009 Paul Mundt
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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; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include <linux/platform_device.h>
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#include <linux/clocksource.h>
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#include <linux/delay.h>
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#include <linux/of_address.h>
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static void __init shmobile_setup_delay_hz(unsigned int max_cpu_core_hz,
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unsigned int mult, unsigned int div)
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{
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/* calculate a worst-case loops-per-jiffy value
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* based on maximum cpu core hz setting and the
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* __delay() implementation in arch/arm/lib/delay.S
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*
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* this will result in a longer delay than expected
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* when the cpu core runs on lower frequencies.
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*/
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unsigned int value = HZ * div / mult;
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if (!preset_lpj)
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preset_lpj = max_cpu_core_hz / value;
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}
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void __init shmobile_init_delay(void)
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{
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struct device_node *np, *cpus;
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bool is_a7_a8_a9 = false;
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bool is_a15 = false;
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bool has_arch_timer = false;
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u32 max_freq = 0;
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cpus = of_find_node_by_path("/cpus");
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if (!cpus)
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return;
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for_each_child_of_node(cpus, np) {
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u32 freq;
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if (!of_property_read_u32(np, "clock-frequency", &freq))
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max_freq = max(max_freq, freq);
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if (of_device_is_compatible(np, "arm,cortex-a8") ||
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of_device_is_compatible(np, "arm,cortex-a9")) {
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is_a7_a8_a9 = true;
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} else if (of_device_is_compatible(np, "arm,cortex-a7")) {
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is_a7_a8_a9 = true;
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has_arch_timer = true;
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} else if (of_device_is_compatible(np, "arm,cortex-a15")) {
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is_a15 = true;
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has_arch_timer = true;
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}
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}
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of_node_put(cpus);
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if (!max_freq)
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return;
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#ifdef CONFIG_ARCH_SHMOBILE_LEGACY
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/* Non-multiplatform r8a73a4 SoC cannot use arch timer due
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* to GIC being initialized from C and arch timer via DT */
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if (of_machine_is_compatible("renesas,r8a73a4"))
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has_arch_timer = false;
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/* Non-multiplatform r8a7790 SoC cannot use arch timer due
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* to GIC being initialized from C and arch timer via DT */
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if (of_machine_is_compatible("renesas,r8a7790"))
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has_arch_timer = false;
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#endif
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if (!has_arch_timer || !IS_ENABLED(CONFIG_ARM_ARCH_TIMER)) {
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if (is_a7_a8_a9)
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shmobile_setup_delay_hz(max_freq, 1, 3);
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else if (is_a15)
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shmobile_setup_delay_hz(max_freq, 2, 4);
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}
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}
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static void __init shmobile_late_time_init(void)
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{
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/*
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* Make sure all compiled-in early timers register themselves.
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*
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* Run probe() for two "earlytimer" devices, these will be the
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* clockevents and clocksource devices respectively. In the event
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* that only a clockevents device is available, we -ENODEV on the
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* clocksource and the jiffies clocksource is used transparently
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* instead. No error handling is necessary here.
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*/
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early_platform_driver_register_all("earlytimer");
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early_platform_driver_probe("earlytimer", 2, 0);
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}
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void __init shmobile_earlytimer_init(void)
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{
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late_time_init = shmobile_late_time_init;
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}
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