diff options
Diffstat (limited to 'target/linux/cns3xxx/files/arch/arm/mach-cns3xxx/platsmp.c')
-rw-r--r-- | target/linux/cns3xxx/files/arch/arm/mach-cns3xxx/platsmp.c | 327 |
1 files changed, 0 insertions, 327 deletions
diff --git a/target/linux/cns3xxx/files/arch/arm/mach-cns3xxx/platsmp.c b/target/linux/cns3xxx/files/arch/arm/mach-cns3xxx/platsmp.c deleted file mode 100644 index cb81d1e752..0000000000 --- a/target/linux/cns3xxx/files/arch/arm/mach-cns3xxx/platsmp.c +++ /dev/null @@ -1,327 +0,0 @@ -/* - * linux/arch/arm/mach-cns3xxx/platsmp.c - * - * Copyright (C) 2002 ARM Ltd. - * Copyright 2012 Gateworks Corporation - * Chris Lang <clang@gateworks.com> - * Tim Harvey <tharvey@gateworks.com> - * - * All Rights Reserved - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ -#include <linux/init.h> -#include <linux/errno.h> -#include <linux/delay.h> -#include <linux/device.h> -#include <linux/jiffies.h> -#include <linux/smp.h> -#include <linux/io.h> - -#include <asm/cacheflush.h> -#include <asm/smp_scu.h> -#include <asm/unified.h> -#include <asm/fiq.h> -#include <mach/smp.h> -#include "cns3xxx.h" - -static struct fiq_handler fh = { - .name = "cns3xxx-fiq" -}; - -struct fiq_req { - union { - struct { - const void *addr; - size_t size; - } map; - struct { - const void *addr; - size_t size; - } unmap; - struct { - const void *start; - const void *end; - } flush; - }; - volatile uint flags; - void __iomem *reg; -} ____cacheline_aligned; - -extern unsigned int fiq_number[2]; - -DEFINE_PER_CPU(struct fiq_req, fiq_data); - -#define FIQ_ENABLED 0x80000000 -#define FIQ_GENERATE 0x00010000 -#define CNS3XXX_MAP_AREA 0x01000000 -#define CNS3XXX_UNMAP_AREA 0x02000000 -#define CNS3XXX_FLUSH_RANGE 0x03000000 - -extern void cns3xxx_secondary_startup(void); -extern unsigned char cns3xxx_fiq_start, cns3xxx_fiq_end; - -#define SCU_CPU_STATUS 0x08 -static void __iomem *scu_base; - -static inline void cns3xxx_set_fiq_regs(unsigned int cpu) -{ - struct pt_regs FIQ_regs; - struct fiq_req *fiq_req = &per_cpu(fiq_data, !cpu); - - FIQ_regs.ARM_r8 = 0; - FIQ_regs.ARM_ip = (unsigned int)fiq_req; - FIQ_regs.ARM_sp = (int) MISC_FIQ_CPU(!cpu); - fiq_req->reg = MISC_FIQ_CPU(!cpu); - - set_fiq_regs(&FIQ_regs); -} - -static void __init cns3xxx_init_fiq(void) -{ - void *fiqhandler_start; - unsigned int fiqhandler_length; - int ret; - - fiqhandler_start = &cns3xxx_fiq_start; - fiqhandler_length = &cns3xxx_fiq_end - &cns3xxx_fiq_start; - - ret = claim_fiq(&fh); - if (ret) - return; - - set_fiq_handler(fiqhandler_start, fiqhandler_length); -} - - -/* - * Write pen_release in a way that is guaranteed to be visible to all - * observers, irrespective of whether they're taking part in coherency - * or not. This is necessary for the hotplug code to work reliably. - */ -static void write_pen_release(int val) -{ - pen_release = val; - smp_wmb(); - __cpuc_flush_dcache_area((void *)&pen_release, sizeof(pen_release)); - outer_clean_range(__pa(&pen_release), __pa(&pen_release + 1)); -} - -static DEFINE_SPINLOCK(boot_lock); - -static void cns3xxx_secondary_init(unsigned int cpu) -{ - /* - * Setup Secondary Core FIQ regs - */ - cns3xxx_set_fiq_regs(1); - - /* - * let the primary processor know we're out of the - * pen, then head off into the C entry point - */ - write_pen_release(-1); - - /* - * Synchronise with the boot thread. - */ - spin_lock(&boot_lock); - spin_unlock(&boot_lock); -} - -static int cns3xxx_boot_secondary(unsigned int cpu, struct task_struct *idle) -{ - unsigned long timeout; - - /* - * Set synchronisation state between this boot processor - * and the secondary one - */ - 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 pen_release. - * - * Note that "pen_release" is the hardware CPU ID, whereas - * "cpu" is Linux's internal ID. - */ - write_pen_release(cpu); - - /* - * Send the secondary CPU a soft interrupt, thereby causing - * the boot monitor to read the system wide flags register, - * and branch to the address found there. - */ - arch_send_wakeup_ipi_mask(cpumask_of(cpu));; - - timeout = jiffies + (1 * HZ); - while (time_before(jiffies, timeout)) { - smp_rmb(); - if (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 pen_release != -1 ? -ENOSYS : 0; -} - -/* - * Initialise the CPU possible map early - this describes the CPUs - * which may be present or become present in the system. - */ -static void __init cns3xxx_smp_init_cpus(void) -{ - unsigned int i, ncores; - unsigned int status; - - scu_base = (void __iomem *) CNS3XXX_TC11MP_SCU_BASE_VIRT; - - /* for CNS3xxx SCU_CPU_STATUS must be examined instead of SCU_CONFIGURATION - * used in scu_get_core_count - */ - status = __raw_readl(scu_base + SCU_CPU_STATUS); - for (i = 0; i < NR_CPUS+1; i++) { - if (((status >> (i*2)) & 0x3) == 0) - set_cpu_possible(i, true); - else - break; - } - ncores = i; -} - -static void __init cns3xxx_smp_prepare_cpus(unsigned int max_cpus) -{ - /* - * enable SCU - */ - scu_enable(scu_base); - - /* - * Write the address of secondary startup into the - * system-wide flags register. The boot monitor waits - * until it receives a soft interrupt, and then the - * secondary CPU branches to this address. - */ - __raw_writel(virt_to_phys(cns3xxx_secondary_startup), - (void __iomem *)(CNS3XXX_MISC_BASE_VIRT + 0x0600)); - - /* - * Setup FIQ's for main cpu - */ - cns3xxx_init_fiq(); - cns3xxx_set_fiq_regs(0); -} - -extern void v6_dma_map_area(const void *, size_t, int); -extern void v6_dma_unmap_area(const void *, size_t, int); -extern void v6_dma_flush_range(const void *, const void *); -extern void v6_flush_kern_dcache_area(void *, size_t); - -void fiq_dma_map_area(const void *addr, size_t size, int dir) -{ - unsigned long flags; - struct fiq_req *req; - - raw_local_irq_save(flags); - /* currently, not possible to take cpu0 down, so only check cpu1 */ - if (!cpu_online(1)) { - raw_local_irq_restore(flags); - v6_dma_map_area(addr, size, dir); - return; - } - - req = this_cpu_ptr(&fiq_data); - req->map.addr = addr; - req->map.size = size; - req->flags = dir | CNS3XXX_MAP_AREA; - smp_mb(); - - writel_relaxed(FIQ_GENERATE, req->reg); - - v6_dma_map_area(addr, size, dir); - while (req->flags) - barrier(); - - raw_local_irq_restore(flags); -} - -void fiq_dma_unmap_area(const void *addr, size_t size, int dir) -{ - unsigned long flags; - struct fiq_req *req; - - raw_local_irq_save(flags); - /* currently, not possible to take cpu0 down, so only check cpu1 */ - if (!cpu_online(1)) { - raw_local_irq_restore(flags); - v6_dma_unmap_area(addr, size, dir); - return; - } - - req = this_cpu_ptr(&fiq_data); - req->unmap.addr = addr; - req->unmap.size = size; - req->flags = dir | CNS3XXX_UNMAP_AREA; - smp_mb(); - - writel_relaxed(FIQ_GENERATE, req->reg); - - v6_dma_unmap_area(addr, size, dir); - while (req->flags) - barrier(); - - raw_local_irq_restore(flags); -} - -void fiq_dma_flush_range(const void *start, const void *end) -{ - unsigned long flags; - struct fiq_req *req; - - raw_local_irq_save(flags); - /* currently, not possible to take cpu0 down, so only check cpu1 */ - if (!cpu_online(1)) { - raw_local_irq_restore(flags); - v6_dma_flush_range(start, end); - return; - } - - req = this_cpu_ptr(&fiq_data); - - req->flush.start = start; - req->flush.end = end; - req->flags = CNS3XXX_FLUSH_RANGE; - smp_mb(); - - writel_relaxed(FIQ_GENERATE, req->reg); - - v6_dma_flush_range(start, end); - - while (req->flags) - barrier(); - - raw_local_irq_restore(flags); -} - -void fiq_flush_kern_dcache_area(void *addr, size_t size) -{ - fiq_dma_flush_range(addr, addr + size); -} - -struct smp_operations cns3xxx_smp_ops __initdata = { - .smp_init_cpus = cns3xxx_smp_init_cpus, - .smp_prepare_cpus = cns3xxx_smp_prepare_cpus, - .smp_secondary_init = cns3xxx_secondary_init, - .smp_boot_secondary = cns3xxx_boot_secondary, -}; |