Anforderungen  |   Konzepte  |   Entwurf  |   Entwicklung  |   Qualitätssicherung  |   Lebenszyklus  |   Steuerung
 
 
 
 

products/sources/formale Sprachen/C/Linux/sound/soc/   (Open Source Betriebssystem Version 6.17.9©)  Datei vom 24.10.2025 mit Größe 9 kB image not shown  

Bilddatei

pl080.c


products/sources/formale Sprachen/C/Linux/arch/arm/mach-spear/pl080.c

// SPDX-License-Identifier: GPL-2.0-only /* * arch/arm/plat-spear/pl080.c * * DMAC pl080 definitions for SPEAr platform * * Copyright (C) 2012 ST Microelectronics * Viresh Kumar */ #include #include #include #include #include #include #include "spear.h" #include "misc_regs.h" #include "pl080.h" static spinlock_t lock = __SPIN_LOCK_UNLOCKED(x); struct { unsigned char busy; unsigned char val; } signals[16] = {{0, 0}, }; int pl080_get_signal(const struct pl08x_channel_data *cd) { unsigned int signal = cd->min_signal, val; unsigned long flags; spin_lock_irqsave(&lock, flags); /* Return if signal is already acquired by somebody else */ if (signals[signal].busy && (signals[signal].val != cd->muxval)) { spin_unlock_irqrestore(&lock, flags); return -EBUSY; } /* If acquiring for the first time, configure it */ if (!signals[signal].busy) { val = readl(DMA_CHN_CFG); /* * Each request line has two bits in DMA_CHN_CFG register. To * goto the bits of current request line, do left shift of * value by 2 * signal number. */ val &= ~(0x3 << (signal * 2)); val |= cd->muxval << (signal * 2); writel(val, DMA_CHN_CFG); } signals[signal].busy++; signals[signal].val = cd->muxval; spin_unlock_irqrestore(&lock, flags); return signal; } void pl080_put_signal(const struct pl08x_channel_data *cd, int signal) { unsigned long flags; spin_lock_irqsave(&lock, flags); /* if signal is not used */ if (!signals[signal].busy) BUG(); signals[signal].busy--; spin_unlock_irqrestore(&lock, flags); }

                                                                                                                                                                                                                                                                                                                                                                                                     

Neuigkeiten

     Aktuelles
     Motto des Tages

Software

     Produkte
     Quellcodebibliothek

Aktivitäten

     Artikel über Sicherheit
     Anleitung zur Aktivierung von SSL

Muße

     Gedichte
     Musik
     Bilder
Jenseits des Üblichen ....
    

Besucherstatistik

Besucherstatistik

Monitoring

Montastic status badge