diff options
Diffstat (limited to 'arch/unicore32/kernel/dma.c')
| -rw-r--r-- | arch/unicore32/kernel/dma.c | 179 |
1 files changed, 0 insertions, 179 deletions
diff --git a/arch/unicore32/kernel/dma.c b/arch/unicore32/kernel/dma.c deleted file mode 100644 index 7a0e2d4d6077..000000000000 --- a/arch/unicore32/kernel/dma.c +++ /dev/null @@ -1,179 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * linux/arch/unicore32/kernel/dma.c - * - * Code specific to PKUnity SoC and UniCore ISA - * - * Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn> - * Copyright (C) 2001-2010 Guan Xuetao - */ - -#include <linux/module.h> -#include <linux/init.h> -#include <linux/kernel.h> -#include <linux/interrupt.h> -#include <linux/errno.h> -#include <linux/io.h> - -#include <asm/irq.h> -#include <mach/hardware.h> -#include <mach/dma.h> - -struct dma_channel { - char *name; - puv3_dma_prio prio; - void (*irq_handler)(int, void *); - void (*err_handler)(int, void *); - void *data; -}; - -static struct dma_channel dma_channels[MAX_DMA_CHANNELS]; - -int puv3_request_dma(char *name, puv3_dma_prio prio, - void (*irq_handler)(int, void *), - void (*err_handler)(int, void *), - void *data) -{ - unsigned long flags; - int i, found = 0; - - /* basic sanity checks */ - if (!name) - return -EINVAL; - - local_irq_save(flags); - - do { - /* try grabbing a DMA channel with the requested priority */ - for (i = 0; i < MAX_DMA_CHANNELS; i++) { - if ((dma_channels[i].prio == prio) && - !dma_channels[i].name) { - found = 1; - break; - } - } - /* if requested prio group is full, try a hier priority */ - } while (!found && prio--); - - if (found) { - dma_channels[i].name = name; - dma_channels[i].irq_handler = irq_handler; - dma_channels[i].err_handler = err_handler; - dma_channels[i].data = data; - } else { - printk(KERN_WARNING "No more available DMA channels for %s\n", - name); - i = -ENODEV; - } - - local_irq_restore(flags); - return i; -} -EXPORT_SYMBOL(puv3_request_dma); - -void puv3_free_dma(int dma_ch) -{ - unsigned long flags; - - if (!dma_channels[dma_ch].name) { - printk(KERN_CRIT - "%s: trying to free channel %d which is already freed\n", - __func__, dma_ch); - return; - } - - local_irq_save(flags); - dma_channels[dma_ch].name = NULL; - dma_channels[dma_ch].err_handler = NULL; - local_irq_restore(flags); -} -EXPORT_SYMBOL(puv3_free_dma); - -static irqreturn_t dma_irq_handler(int irq, void *dev_id) -{ - int i, dint; - - dint = readl(DMAC_ITCSR); - for (i = 0; i < MAX_DMA_CHANNELS; i++) { - if (dint & DMAC_CHANNEL(i)) { - struct dma_channel *channel = &dma_channels[i]; - - /* Clear TC interrupt of channel i */ - writel(DMAC_CHANNEL(i), DMAC_ITCCR); - writel(0, DMAC_ITCCR); - - if (channel->name && channel->irq_handler) { - channel->irq_handler(i, channel->data); - } else { - /* - * IRQ for an unregistered DMA channel: - * let's clear the interrupts and disable it. - */ - printk(KERN_WARNING "spurious IRQ for" - " DMA channel %d\n", i); - } - } - } - return IRQ_HANDLED; -} - -static irqreturn_t dma_err_handler(int irq, void *dev_id) -{ - int i, dint; - - dint = readl(DMAC_IESR); - for (i = 0; i < MAX_DMA_CHANNELS; i++) { - if (dint & DMAC_CHANNEL(i)) { - struct dma_channel *channel = &dma_channels[i]; - - /* Clear Err interrupt of channel i */ - writel(DMAC_CHANNEL(i), DMAC_IECR); - writel(0, DMAC_IECR); - - if (channel->name && channel->err_handler) { - channel->err_handler(i, channel->data); - } else { - /* - * IRQ for an unregistered DMA channel: - * let's clear the interrupts and disable it. - */ - printk(KERN_WARNING "spurious IRQ for" - " DMA channel %d\n", i); - } - } - } - return IRQ_HANDLED; -} - -int __init puv3_init_dma(void) -{ - int i, ret; - - /* dma channel priorities on v8 processors: - * ch 0 - 1 <--> (0) DMA_PRIO_HIGH - * ch 2 - 3 <--> (1) DMA_PRIO_MEDIUM - * ch 4 - 5 <--> (2) DMA_PRIO_LOW - */ - for (i = 0; i < MAX_DMA_CHANNELS; i++) { - puv3_stop_dma(i); - dma_channels[i].name = NULL; - dma_channels[i].prio = min((i & 0x7) >> 1, DMA_PRIO_LOW); - } - - ret = request_irq(IRQ_DMA, dma_irq_handler, 0, "DMA", NULL); - if (ret) { - printk(KERN_CRIT "Can't register IRQ for DMA\n"); - return ret; - } - - ret = request_irq(IRQ_DMAERR, dma_err_handler, 0, "DMAERR", NULL); - if (ret) { - printk(KERN_CRIT "Can't register IRQ for DMAERR\n"); - free_irq(IRQ_DMA, "DMA"); - return ret; - } - - return 0; -} - -postcore_initcall(puv3_init_dma); |