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ARM: tegra: Trusted Foundations work for 3.15

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This pull request contains a number of cleanups and enhancements for the
 Trusted Foundations firmware used on production Tegra SoCs. The changes
 allow kernels without TF support to run on HW that uses TF, albeit with
 reduced functionality, and also fix the cpuidle feature.
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Merge tag 'tegra-for-3.15-tf' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux into next/soc

Merge "ARM: tegra: Trusted Foundations work for 3.15" from Stephen Warren:

This pull request contains a number of cleanups and enhancements for the
Trusted Foundations firmware used on production Tegra SoCs. The changes
allow kernels without TF support to run on HW that uses TF, albeit with
reduced functionality, and also fix the cpuidle feature.

* tag 'tegra-for-3.15-tf' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux:
  ARM: tegra: cpuidle: use firmware for power down
  ARM: trusted_foundations: implement prepare_idle()
  ARM: firmware: add prepare_idle() operation
  ARM: firmware: enable Trusted Foundations by default
  ARM: trusted_foundations: fallback when TF support is missing
  ARM: trusted_foundations: fix vendor prefix typos

Signed-off-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Olof Johansson 2014-03-20 14:35:13 -07:00
commit 5d4089a4ad
5 changed files with 40 additions and 7 deletions
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3
arch/arm/firmware/Kconfig
View File

@ -11,6 +11,7 @@ menu "Firmware options"
config TRUSTED_FOUNDATIONS
bool "Trusted Foundations secure monitor support"
depends on ARCH_SUPPORTS_TRUSTED_FOUNDATIONS
default y
help
Some devices (including most Tegra-based consumer devices on the
market) are booted with the Trusted Foundations secure monitor
@ -20,7 +21,7 @@ config TRUSTED_FOUNDATIONS
This option allows the kernel to invoke the secure monitor whenever
required on devices using Trusted Foundations. See
arch/arm/include/asm/trusted_foundations.h or the
tl,trusted-foundations device tree binding documentation for details
tlm,trusted-foundations device tree binding documentation for details
on how to use it.
Say n if you don't know what this is about.

20
arch/arm/firmware/trusted_foundations.c
View File

@ -22,6 +22,15 @@
#define TF_SET_CPU_BOOT_ADDR_SMC 0xfffff200
#define TF_CPU_PM 0xfffffffc
#define TF_CPU_PM_S3 0xffffffe3
#define TF_CPU_PM_S2 0xffffffe6
#define TF_CPU_PM_S2_NO_MC_CLK 0xffffffe5
#define TF_CPU_PM_S1 0xffffffe4
#define TF_CPU_PM_S1_NOFLUSH_L2 0xffffffe7
static unsigned long cpu_boot_addr;
static void __naked tf_generic_smc(u32 type, u32 arg1, u32 arg2)
{
asm volatile(
@ -41,13 +50,22 @@ static void __naked tf_generic_smc(u32 type, u32 arg1, u32 arg2)
static int tf_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
{
tf_generic_smc(TF_SET_CPU_BOOT_ADDR_SMC, boot_addr, 0);
cpu_boot_addr = boot_addr;
tf_generic_smc(TF_SET_CPU_BOOT_ADDR_SMC, cpu_boot_addr, 0);
return 0;
}
static int tf_prepare_idle(void)
{
tf_generic_smc(TF_CPU_PM, TF_CPU_PM_S1_NOFLUSH_L2, cpu_boot_addr);
return 0;
}
static const struct firmware_ops trusted_foundations_ops = {
.set_cpu_boot_addr = tf_set_cpu_boot_addr,
.prepare_idle = tf_prepare_idle,
};
void register_trusted_foundations(struct trusted_foundations_platform_data *pd)

4
arch/arm/include/asm/firmware.h
View File

@ -21,6 +21,10 @@
* A filled up structure can be registered with register_firmware_ops().
*/
struct firmware_ops {
/*
* Inform the firmware we intend to enter CPU idle mode
*/
int (*prepare_idle)(void);
/*
* Enters CPU idle mode
*/

13
arch/arm/include/asm/trusted_foundations.h
View File

@ -30,6 +30,8 @@
#include <linux/printk.h>
#include <linux/bug.h>
#include <linux/of.h>
#include <linux/cpu.h>
#include <linux/smp.h>
struct trusted_foundations_platform_data {
unsigned int version_major;
@ -47,10 +49,13 @@ static inline void register_trusted_foundations(
struct trusted_foundations_platform_data *pd)
{
/*
* If we try to register TF, this means the system needs it to continue.
* Its absence if thus a fatal error.
* If the system requires TF and we cannot provide it, continue booting
* but disable features that cannot be provided.
*/
panic("No support for Trusted Foundations, stopping...\n");
pr_err("No support for Trusted Foundations, continuing in degraded mode.\n");
pr_err("Secondary processors as well as CPU PM will be disabled.\n");
setup_max_cpus = 0;
cpu_idle_poll_ctrl(true);
}
static inline void of_register_trusted_foundations(void)
@ -59,7 +64,7 @@ static inline void of_register_trusted_foundations(void)
* If we find the target should enable TF but does not support it,
* fail as the system won't be able to do much anyway
*/
if (of_find_compatible_node(NULL, NULL, "tl,trusted-foundations"))
if (of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations"))
register_trusted_foundations(NULL);
}
#endif /* CONFIG_TRUSTED_FOUNDATIONS */

7
arch/arm/mach-tegra/cpuidle-tegra114.c
View File

@ -19,6 +19,7 @@
#include <linux/cpuidle.h>
#include <linux/cpu_pm.h>
#include <linux/clockchips.h>
#include <asm/firmware.h>
#include <asm/cpuidle.h>
#include <asm/suspend.h>
@ -45,7 +46,11 @@ static int tegra114_idle_power_down(struct cpuidle_device *dev,
clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &dev->cpu);
cpu_suspend(0, tegra30_sleep_cpu_secondary_finish);
call_firmware_op(prepare_idle);
/* Do suspend by ourselves if the firmware does not implement it */
if (call_firmware_op(do_idle) == -ENOSYS)
cpu_suspend(0, tegra30_sleep_cpu_secondary_finish);
clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &dev->cpu);