linux/arch/arm/mach-shmobile/timer.c
Olof Johansson 28111dda37 Third Round of Renesas ARM Based SoC Fixes for v3.19
* Instantiate GIC from C board code in legacy builds on r8a7790 and r8a73a4
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 
 iQIcBAABAgAGBQJUytABAAoJENfPZGlqN0++qrkP/R2n+rHBNvZTW4p88IZcZ37O
 7zRXCkcXLHHVfKp8XHEMrhH/Pc7uIonWgq3SIKHDlK9UwAvfOdLPj2CMGm7bN+Ea
 +fgT6Qe1UP9kgbsH1whovsR3CzjLDqxmlhfjTkrmu5UjFNGQuv/iFVkkzViSCDYd
 YkSIYxybAlH3Nd7xxNFG54LzjCPauY2V76JM76/3j24m+zxZverY8sN46PtKryGg
 /toQzuVeimpz4BtObXZAi7Y7eWvvYUtELGshTTGKBmtRhLWGZDrS+60KpMDVoKtK
 f135X2taKm2jIiKPXCPMQTOWsXBls1TuxIGssiIysPU6t5OCSuNd/M1RiKDhZhE3
 J4L4vCMq/Gn2XbYe2+O0PNkLxuWepSZ4VRzALZCPhP48CYGrazP63JWTnjROcC61
 5bxuUtWMUVHF52hEWf6bXEiAEBNZP7u8kBc02drsscQHM/N3SiFcIxK/nGlIVMjy
 Qt01fYR+zZZ2v5OhQHeEe7lBfUMnKA9+QLHR4dJ32oJvyAFiDImLsrEBiVlTDk47
 gYJXmqGp2GWgB1H2mDiopHg+ERsavK9P7FL9juYG3OdvFPFuQwktJDSpN+Y0GZMV
 wRADV2/ylZBw48DidX86TD3gwtV7gP995nHvQJ2nv+/Kjq58uR4AHwn0wVHPldCE
 cDf5IYwdvD0a42id6zb5
 =/Oq9
 -----END PGP SIGNATURE-----

Merge tag 'renesas-soc-fixes3-for-v3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas into fixes

Merge "Third Round of Renesas ARM Based SoC Fixes for v3.19" from Simon Horman:

* Instantiate GIC from C board code in legacy builds on r8a7790 and r8a73a4

* tag 'renesas-soc-fixes3-for-v3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas:
  ARM: shmobile: r8a7790: Instantiate GIC from C board code in legacy builds
  ARM: shmobile: r8a73a4: Instantiate GIC from C board code in legacy builds

Signed-off-by: Olof Johansson <olof@lixom.net>
2015-02-01 08:51:12 -08:00

113 lines
3.1 KiB
C

/*
* SH-Mobile Timer
*
* Copyright (C) 2010 Magnus Damm
* Copyright (C) 2002 - 2009 Paul Mundt
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/platform_device.h>
#include <linux/clocksource.h>
#include <linux/delay.h>
#include <linux/of_address.h>
static void __init shmobile_setup_delay_hz(unsigned int max_cpu_core_hz,
unsigned int mult, unsigned int div)
{
/* calculate a worst-case loops-per-jiffy value
* based on maximum cpu core hz setting and the
* __delay() implementation in arch/arm/lib/delay.S
*
* this will result in a longer delay than expected
* when the cpu core runs on lower frequencies.
*/
unsigned int value = HZ * div / mult;
if (!preset_lpj)
preset_lpj = max_cpu_core_hz / value;
}
void __init shmobile_init_delay(void)
{
struct device_node *np, *cpus;
bool is_a7_a8_a9 = false;
bool is_a15 = false;
bool has_arch_timer = false;
u32 max_freq = 0;
cpus = of_find_node_by_path("/cpus");
if (!cpus)
return;
for_each_child_of_node(cpus, np) {
u32 freq;
if (!of_property_read_u32(np, "clock-frequency", &freq))
max_freq = max(max_freq, freq);
if (of_device_is_compatible(np, "arm,cortex-a8") ||
of_device_is_compatible(np, "arm,cortex-a9")) {
is_a7_a8_a9 = true;
} else if (of_device_is_compatible(np, "arm,cortex-a7")) {
is_a7_a8_a9 = true;
has_arch_timer = true;
} else if (of_device_is_compatible(np, "arm,cortex-a15")) {
is_a15 = true;
has_arch_timer = true;
}
}
of_node_put(cpus);
if (!max_freq)
return;
#ifdef CONFIG_ARCH_SHMOBILE_LEGACY
/* Non-multiplatform r8a73a4 SoC cannot use arch timer due
* to GIC being initialized from C and arch timer via DT */
if (of_machine_is_compatible("renesas,r8a73a4"))
has_arch_timer = false;
/* Non-multiplatform r8a7790 SoC cannot use arch timer due
* to GIC being initialized from C and arch timer via DT */
if (of_machine_is_compatible("renesas,r8a7790"))
has_arch_timer = false;
#endif
if (!has_arch_timer || !IS_ENABLED(CONFIG_ARM_ARCH_TIMER)) {
if (is_a7_a8_a9)
shmobile_setup_delay_hz(max_freq, 1, 3);
else if (is_a15)
shmobile_setup_delay_hz(max_freq, 2, 4);
}
}
static void __init shmobile_late_time_init(void)
{
/*
* Make sure all compiled-in early timers register themselves.
*
* Run probe() for two "earlytimer" devices, these will be the
* clockevents and clocksource devices respectively. In the event
* that only a clockevents device is available, we -ENODEV on the
* clocksource and the jiffies clocksource is used transparently
* instead. No error handling is necessary here.
*/
early_platform_driver_register_all("earlytimer");
early_platform_driver_probe("earlytimer", 2, 0);
}
void __init shmobile_earlytimer_init(void)
{
late_time_init = shmobile_late_time_init;
}