diff options
| author | Peng Fan | 2020-05-03 21:58:47 +0800 |
|---|---|---|
| committer | Stefano Babic | 2020-05-03 15:45:49 +0200 |
| commit | 4c809aee50f5128f815a7f272cdf2d30a1e1e76e (patch) | |
| tree | 41fba222d2362cf5efe94369a81b3828703c3b95 /drivers/cpu | |
| parent | d8e775539e6d69a2bf9d4de721f6ad1560de7823 (diff) | |
uclass: cpu: Add new API to get udevice for current CPU
When running on SoC with multiple clusters, the boot CPU may
not be fixed, saying booting from cluster A or cluster B.
Add a API that can return the udevice for current boot CPU.
Cpu driver needs to implement is_current_cpu interface for this
feature, otherwise the API only returns the first udevice in
cpu uclass.
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Ye Li <ye.li@nxp.com>
Diffstat (limited to 'drivers/cpu')
| -rw-r--r-- | drivers/cpu/cpu-uclass.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/cpu/cpu-uclass.c b/drivers/cpu/cpu-uclass.c index 457f77b7c89..8352e2eb0bc 100644 --- a/drivers/cpu/cpu-uclass.c +++ b/drivers/cpu/cpu-uclass.c @@ -10,6 +10,7 @@ #include <errno.h> #include <dm/lists.h> #include <dm/root.h> +#include <linux/err.h> int cpu_probe_all(void) { @@ -34,6 +35,39 @@ int cpu_probe_all(void) return 0; } +int cpu_is_current(struct udevice *cpu) +{ + struct cpu_ops *ops = cpu_get_ops(cpu); + + if (ops->is_current) { + if (ops->is_current(cpu)) + return 1; + } + + return -ENOSYS; +} + +struct udevice *cpu_get_current_dev(void) +{ + struct udevice *cpu; + int ret; + + uclass_foreach_dev_probe(UCLASS_CPU, cpu) { + if (cpu_is_current(cpu) > 0) + return cpu; + } + + /* If can't find current cpu device, use the first dev instead */ + ret = uclass_first_device_err(UCLASS_CPU, &cpu); + if (ret) { + debug("%s: Could not get CPU device (err = %d)\n", + __func__, ret); + return NULL; + } + + return cpu; +} + int cpu_get_desc(struct udevice *dev, char *buf, int size) { struct cpu_ops *ops = cpu_get_ops(dev); |