1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2018 Nuvoton Technology corporation.
3 // Copyright 2018 Google, Inc.
5 #define pr_fmt(fmt) "nuvoton,npcm7xx-smp: " fmt
7 #include <linux/delay.h>
11 #include <linux/of_address.h>
12 #include <asm/cacheflush.h>
14 #include <asm/smp_plat.h>
15 #include <asm/smp_scu.h>
17 #define NPCM7XX_SCRPAD_REG 0x13c
19 extern void npcm7xx_secondary_startup(void);
21 static int npcm7xx_smp_boot_secondary(unsigned int cpu,
22 struct task_struct *idle)
24 struct device_node *gcr_np;
25 void __iomem *gcr_base;
28 gcr_np = of_find_compatible_node(NULL, NULL, "nuvoton,npcm750-gcr");
30 pr_err("no gcr device node\n");
34 gcr_base = of_iomap(gcr_np, 0);
36 pr_err("could not iomap gcr");
41 /* give boot ROM kernel start address. */
42 iowrite32(__pa_symbol(npcm7xx_secondary_startup), gcr_base +
44 /* make sure the previous write is seen by all observers. */
52 static void __init npcm7xx_smp_prepare_cpus(unsigned int max_cpus)
54 struct device_node *scu_np;
55 void __iomem *scu_base;
57 scu_np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
59 pr_err("no scu device node\n");
62 scu_base = of_iomap(scu_np, 0);
64 pr_err("could not iomap scu");
73 static struct smp_operations npcm7xx_smp_ops __initdata = {
74 .smp_prepare_cpus = npcm7xx_smp_prepare_cpus,
75 .smp_boot_secondary = npcm7xx_smp_boot_secondary,
78 CPU_METHOD_OF_DECLARE(npcm7xx_smp, "nuvoton,npcm750-smp", &npcm7xx_smp_ops);