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Diffstat (limited to '')
| -rw-r--r-- | arch/arm/mach-prima2/platsmp.c | 123 |
1 files changed, 0 insertions, 123 deletions
diff --git a/arch/arm/mach-prima2/platsmp.c b/arch/arm/mach-prima2/platsmp.c deleted file mode 100644 index 8f7bbb57fb20..000000000000 --- a/arch/arm/mach-prima2/platsmp.c +++ /dev/null @@ -1,123 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * plat smp support for CSR Marco dual-core SMP SoCs - * - * Copyright (c) 2012 Cambridge Silicon Radio Limited, a CSR plc group company. - */ - -#include <linux/init.h> -#include <linux/smp.h> -#include <linux/delay.h> -#include <linux/of.h> -#include <linux/of_address.h> -#include <asm/page.h> -#include <asm/mach/map.h> -#include <asm/smp_plat.h> -#include <asm/smp_scu.h> -#include <asm/cacheflush.h> -#include <asm/cputype.h> - -#include "common.h" - -static void __iomem *clk_base; - -static DEFINE_SPINLOCK(boot_lock); - -/* XXX prima2_pen_release is cargo culted code - DO NOT COPY XXX */ -volatile int prima2_pen_release = -1; - -static void sirfsoc_secondary_init(unsigned int cpu) -{ - /* - * let the primary processor know we're out of the - * pen, then head off into the C entry point - */ - prima2_pen_release = -1; - smp_wmb(); - - /* - * Synchronise with the boot thread. - */ - spin_lock(&boot_lock); - spin_unlock(&boot_lock); -} - -static const struct of_device_id clk_ids[] = { - { .compatible = "sirf,atlas7-clkc" }, - {}, -}; - -static int sirfsoc_boot_secondary(unsigned int cpu, struct task_struct *idle) -{ - unsigned long timeout; - struct device_node *np; - - np = of_find_matching_node(NULL, clk_ids); - if (!np) - return -ENODEV; - - clk_base = of_iomap(np, 0); - if (!clk_base) - return -ENOMEM; - - /* - * write the address of secondary startup into the clkc register - * at offset 0x2bC, then write the magic number 0x3CAF5D62 to the - * clkc register at offset 0x2b8, which is what boot rom code is - * waiting for. This would wake up the secondary core from WFE - */ -#define SIRFSOC_CPU1_JUMPADDR_OFFSET 0x2bc - __raw_writel(__pa_symbol(sirfsoc_secondary_startup), - clk_base + SIRFSOC_CPU1_JUMPADDR_OFFSET); - -#define SIRFSOC_CPU1_WAKEMAGIC_OFFSET 0x2b8 - __raw_writel(0x3CAF5D62, - clk_base + SIRFSOC_CPU1_WAKEMAGIC_OFFSET); - - /* make sure write buffer is drained */ - mb(); - - spin_lock(&boot_lock); - - /* - * The secondary processor is waiting to be released from - * the holding pen - release it, then wait for it to flag - * that it has been released by resetting prima2_pen_release. - * - * Note that "prima2_pen_release" is the hardware CPU ID, whereas - * "cpu" is Linux's internal ID. - */ - prima2_pen_release = cpu_logical_map(cpu); - sync_cache_w(&prima2_pen_release); - - /* - * Send the secondary CPU SEV, thereby causing the boot monitor to read - * the JUMPADDR and WAKEMAGIC, and branch to the address found there. - */ - dsb_sev(); - - timeout = jiffies + (1 * HZ); - while (time_before(jiffies, timeout)) { - smp_rmb(); - if (prima2_pen_release == -1) - break; - - udelay(10); - } - - /* - * now the secondary core is starting up let it run its - * calibrations, then wait for it to finish - */ - spin_unlock(&boot_lock); - - return prima2_pen_release != -1 ? -ENOSYS : 0; -} - -const struct smp_operations sirfsoc_smp_ops __initconst = { - .smp_secondary_init = sirfsoc_secondary_init, - .smp_boot_secondary = sirfsoc_boot_secondary, -#ifdef CONFIG_HOTPLUG_CPU - .cpu_die = sirfsoc_cpu_die, -#endif -}; |