projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 7bffa14c BH |
1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | // Copyright (c) 2018 Nuvoton Technology corporation. | |
| 3 | // Copyright 2018 Google, Inc. | |
| 4 | ||
| 5 | #define pr_fmt(fmt) "nuvoton,npcm7xx-smp: " fmt | |
| 6 | ||
| 7 | #include <linux/delay.h> | |
| 8 | #include <linux/device.h> | |
| 9 | #include <linux/smp.h> | |
| 10 | #include <linux/io.h> | |
| 11 | #include <linux/of.h> | |
| 12 | #include <linux/of_device.h> | |
| 13 | #include <linux/of_platform.h> | |
| 14 | #include <linux/of_address.h> | |
| 15 | #include <asm/cacheflush.h> | |
| 16 | #include <asm/smp.h> | |
| 17 | #include <asm/smp_plat.h> | |
| 18 | #include <asm/smp_scu.h> | |
| 19 | ||
| 20 | #define NPCM7XX_SCRPAD_REG 0x13c | |
| 21 | ||
| 22 | extern void npcm7xx_secondary_startup(void); | |
| 23 | ||
| 24 | static int npcm7xx_smp_boot_secondary(unsigned int cpu, | |
| 25 | struct task_struct *idle) | |
| 26 | { | |
| 27 | struct device_node *gcr_np; | |
| 28 | void __iomem *gcr_base; | |
| 29 | int ret = 0; | |
| 30 | ||
| 31 | gcr_np = of_find_compatible_node(NULL, NULL, "nuvoton,npcm750-gcr"); | |
| 32 | if (!gcr_np) { | |
| 33 | pr_err("no gcr device node\n"); | |
| 34 | ret = -ENODEV; | |
| 35 | goto out; | |
| 36 | } | |
| 37 | gcr_base = of_iomap(gcr_np, 0); | |
| 38 | if (!gcr_base) { | |
| 39 | pr_err("could not iomap gcr"); | |
| 40 | ret = -ENOMEM; | |
| 41 | goto out; | |
| 42 | } | |
| 43 | ||
| 44 | /* give boot ROM kernel start address. */ | |
| 45 | iowrite32(__pa_symbol(npcm7xx_secondary_startup), gcr_base + | |
| 46 | NPCM7XX_SCRPAD_REG); | |
| 47 | /* make sure the previous write is seen by all observers. */ | |
| 48 | dsb_sev(); | |
| 49 | ||
| 50 | iounmap(gcr_base); | |
| 51 | out: | |
| 52 | return ret; | |
| 53 | } | |
| 54 | ||
| 55 | static void __init npcm7xx_smp_prepare_cpus(unsigned int max_cpus) | |
| 56 | { | |
| 57 | struct device_node *scu_np; | |
| 58 | void __iomem *scu_base; | |
| 59 | ||
| 60 | scu_np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu"); | |
| 61 | if (!scu_np) { | |
| 62 | pr_err("no scu device node\n"); | |
| 63 | return; | |
| 64 | } | |
| 65 | scu_base = of_iomap(scu_np, 0); | |
| 66 | if (!scu_base) { | |
| 67 | pr_err("could not iomap scu"); | |
| 68 | return; | |
| 69 | } | |
| 70 | ||
| 71 | scu_enable(scu_base); | |
| 72 | ||
| 73 | iounmap(scu_base); | |
| 74 | } | |
| 75 | ||
| 76 | static struct smp_operations npcm7xx_smp_ops __initdata = { | |
| 77 | .smp_prepare_cpus = npcm7xx_smp_prepare_cpus, | |
| 78 | .smp_boot_secondary = npcm7xx_smp_boot_secondary, | |
| 79 | }; | |
| 80 | ||
| 81 | CPU_METHOD_OF_DECLARE(npcm7xx_smp, "nuvoton,npcm750-smp", &npcm7xx_smp_ops); |