// SPDX-License-Identifier: GPL-2.0-only /* * arch/arm/mach-netx/pfifo.c * * Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix */ #include <linux/init.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/io.h> #include <mach/hardware.h> #include <mach/netx-regs.h> #include <mach/pfifo.h> static DEFINE_MUTEX(pfifo_lock); static unsigned int pfifo_used = 0; int pfifo_request(unsigned int pfifo_mask) { int err = 0; unsigned int val; mutex_lock(&pfifo_lock); if (pfifo_mask & pfifo_used) { err = -EBUSY; goto out; } pfifo_used |= pfifo_mask; val = readl(NETX_PFIFO_RESET); writel(val | pfifo_mask, NETX_PFIFO_RESET); writel(val, NETX_PFIFO_RESET); out: mutex_unlock(&pfifo_lock); return err; } void pfifo_free(unsigned int pfifo_mask) { mutex_lock(&pfifo_lock); pfifo_used &= ~pfifo_mask; mutex_unlock(&pfifo_lock); } EXPORT_SYMBOL(pfifo_push); EXPORT_SYMBOL(pfifo_pop); EXPORT_SYMBOL(pfifo_fill_level); EXPORT_SYMBOL(pfifo_empty); EXPORT_SYMBOL(pfifo_request); EXPORT_SYMBOL(pfifo_free);