[PATCHv2 4/9] cpu: imx: implement release_core callback
Zhiqiang Hou
Zhiqiang.Hou at nxp.com
Thu Jul 25 11:53:26 CEST 2024
From: Hou Zhiqiang <Zhiqiang.Hou at nxp.com>
Release the secondary cores through the PSCI request.
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou at nxp.com>
---
V2:
- No change.
drivers/cpu/imx8_cpu.c | 26 +++++++++++++++++++++++++-
1 file changed, 25 insertions(+), 1 deletion(-)
diff --git a/drivers/cpu/imx8_cpu.c b/drivers/cpu/imx8_cpu.c
index 4781a565547..5942a28be4b 100644
--- a/drivers/cpu/imx8_cpu.c
+++ b/drivers/cpu/imx8_cpu.c
@@ -1,12 +1,13 @@
// SPDX-License-Identifier: GPL-2.0+
/*
- * Copyright 2019 NXP
+ * Copyright 2019, 2024 NXP
*/
#include <cpu.h>
#include <dm.h>
#include <thermal.h>
#include <asm/global_data.h>
+#include <asm/ptrace.h>
#include <asm/system.h>
#include <firmware/imx/sci/sci.h>
#include <asm/arch/sys_proto.h>
@@ -15,6 +16,7 @@
#include <imx_thermal.h>
#include <linux/bitops.h>
#include <linux/clk-provider.h>
+#include <linux/psci.h>
DECLARE_GLOBAL_DATA_PTR;
@@ -236,12 +238,34 @@ static int cpu_imx_is_current(struct udevice *dev)
return 0;
}
+static int cpu_imx_release_core(const struct udevice *dev, phys_addr_t addr)
+{
+ struct cpu_imx_plat *plat = dev_get_plat(dev);
+ struct pt_regs regs;
+
+ regs.regs[0] = PSCI_0_2_FN64_CPU_ON;
+ regs.regs[1] = plat->mpidr;
+ regs.regs[2] = addr;
+ regs.regs[3] = 0;
+
+ smc_call(®s);
+ if (regs.regs[0]) {
+ printf("Failed to release CPU core (mpidr: 0x%x)\n", plat->mpidr);
+ return -1;
+ }
+
+ printf("Released CPU core (mpidr: 0x%x) to address 0x%llx\n", plat->mpidr, addr);
+
+ return 0;
+}
+
static const struct cpu_ops cpu_imx_ops = {
.get_desc = cpu_imx_get_desc,
.get_info = cpu_imx_get_info,
.get_count = cpu_imx_get_count,
.get_vendor = cpu_imx_get_vendor,
.is_current = cpu_imx_is_current,
+ .release_core = cpu_imx_release_core,
};
static const struct udevice_id cpu_imx_ids[] = {
--
2.43.0
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