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138310e18b
* Initial r8a7794 SoC support * Support Cortex-A7 in shmobile_init_delay() -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJUDnyTAAoJENfPZGlqN0++xcUP/RO2TIFpvKKQ69B8v7OJpPKJ yaqZFsg5A0lTHos7as3/4osHQfUtp6dz0Ko9DZIs7EYQ7Xue0OoIJ48O/c9EaPJD zLVvNYuh/LavXHeXnvKyp9ixYzY5f3A26+mx3PZAFJrmlaqAypt5STPNdqmf61ot U/uEwhtXU2hDY0AW865RgvOESDWpRY+YjrVihMgW/EQE+Glq2U6mnmrjANglZyRv /FnifymlhTByH81KauYqLTYbtdoAJFCvOa+ZHqLIZHqu7/K5G29b6TgnlbqanVBp GFIxLVHFqppgyIbJqpmBqHRB5BLL1ISoAV5z5p7K6ujjz73yIMReBoCVP4rZ7ZXh j+t4E7HyzaI5JoGJJyUEmtv4+gqQq486mDYEsJl3r/3ByLT52DglerAFnOhd1fmU VBpFydYfOtpA9LtGJXlxTBDJOecP857Kv81agROLY+NID24dcq1lRImffq88poHQ ck3DRSyagdZWWc7uGxhZqTltJufgazP7odya31roIC2C5q6j5kDON04inxzH0FBU eqNhYEYYgBUYWUBje1cL50WuPboRdvV5kJjAspKNbLt8jAQ+mky9pZqoJbndRdNT kg30WH2WXaMD+naQPh6g07kQPrmuwz0tOtIdcZ598T6k+tXGufwE6OPIR/LsxMIq TSw0JlT6DO8XPSMMGMDs =iaYv -----END PGP SIGNATURE----- Merge tag 'renesas-soc3-for-v3.18' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas into next/soc Pull "Third Round of Renesas ARM Based SoC Soc Updates for v3.18" from Simon Horman: * Initial r8a7794 SoC support * Support Cortex-A7 in shmobile_init_delay() Signed-off-by: Arnd Bergmann <arnd@arndb.de> * tag 'renesas-soc3-for-v3.18' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas: ARM: shmobile: Initial r8a7794 SoC support ARM: shmobile: support Cortex-A7 in shmobile_init_delay()
99 lines
2.8 KiB
C
99 lines
2.8 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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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-a7") ||
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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-a15"))
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is_a15 = true;
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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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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 && !IS_ENABLED(CONFIG_ARM_ARCH_TIMER))
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shmobile_setup_delay_hz(max_freq, 2, 4);
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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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