/*
* bfin_dma_5xx.c - Blackfin DMA implementation
*
- * Copyright 2004-2006 Analog Devices Inc.
+ * Copyright 2004-2008 Analog Devices Inc.
* Licensed under the GPL-2 or later.
*/
#include <asm/dma.h>
#include <asm/uaccess.h>
-/**************************************************************************
- * Global Variables
-***************************************************************************/
-
-static struct dma_channel dma_ch[MAX_DMA_CHANNELS];
-
-/*------------------------------------------------------------------------------
- * Set the Buffer Clear bit in the Configuration register of specific DMA
- * channel. This will stop the descriptor based DMA operation.
- *-----------------------------------------------------------------------------*/
-static void clear_dma_buffer(unsigned int channel)
-{
- dma_ch[channel].regs->cfg |= RESTART;
- SSYNC();
- dma_ch[channel].regs->cfg &= ~RESTART;
-}
+struct dma_channel dma_ch[MAX_DMA_CHANNELS];
+EXPORT_SYMBOL(dma_ch);
static int __init blackfin_dma_init(void)
{
late_initcall(proc_dma_init);
#endif
-/*------------------------------------------------------------------------------
- * Request the specific DMA channel from the system.
- *-----------------------------------------------------------------------------*/
+/**
+ * request_dma - request a DMA channel
+ *
+ * Request the specific DMA channel from the system if it's available.
+ */
int request_dma(unsigned int channel, const char *device_id)
{
pr_debug("request_dma() : BEGIN \n");
* descriptor/channel
*/
pr_debug("request_dma() : END \n");
- return channel;
+ return 0;
}
EXPORT_SYMBOL(request_dma);
}
EXPORT_SYMBOL(set_dma_callback);
+/**
+ * clear_dma_buffer - clear DMA fifos for specified channel
+ *
+ * Set the Buffer Clear bit in the Configuration register of specific DMA
+ * channel. This will stop the descriptor based DMA operation.
+ */
+static void clear_dma_buffer(unsigned int channel)
+{
+ dma_ch[channel].regs->cfg |= RESTART;
+ SSYNC();
+ dma_ch[channel].regs->cfg &= ~RESTART;
+}
+
void free_dma(unsigned int channel)
{
pr_debug("freedma() : BEGIN \n");
}
EXPORT_SYMBOL(free_dma);
-void dma_enable_irq(unsigned int channel)
-{
- pr_debug("dma_enable_irq() : BEGIN \n");
- enable_irq(dma_ch[channel].irq);
-}
-EXPORT_SYMBOL(dma_enable_irq);
-
-void dma_disable_irq(unsigned int channel)
-{
- pr_debug("dma_disable_irq() : BEGIN \n");
- disable_irq(dma_ch[channel].irq);
-}
-EXPORT_SYMBOL(dma_disable_irq);
-
-int dma_channel_active(unsigned int channel)
-{
- if (dma_ch[channel].chan_status == DMA_CHANNEL_FREE) {
- return 0;
- } else {
- return 1;
- }
-}
-EXPORT_SYMBOL(dma_channel_active);
-
-/*------------------------------------------------------------------------------
-* stop the specific DMA channel.
-*-----------------------------------------------------------------------------*/
-void disable_dma(unsigned int channel)
-{
- pr_debug("stop_dma() : BEGIN \n");
- dma_ch[channel].regs->cfg &= ~DMAEN; /* Clean the enable bit */
- SSYNC();
- dma_ch[channel].chan_status = DMA_CHANNEL_REQUESTED;
- /* Needs to be enabled Later */
- pr_debug("stop_dma() : END \n");
- return;
-}
-EXPORT_SYMBOL(disable_dma);
-
-void enable_dma(unsigned int channel)
-{
- pr_debug("enable_dma() : BEGIN \n");
- dma_ch[channel].chan_status = DMA_CHANNEL_ENABLED;
- dma_ch[channel].regs->curr_x_count = 0;
- dma_ch[channel].regs->curr_y_count = 0;
-
- dma_ch[channel].regs->cfg |= DMAEN; /* Set the enable bit */
- pr_debug("enable_dma() : END \n");
- return;
-}
-EXPORT_SYMBOL(enable_dma);
-
-/*------------------------------------------------------------------------------
-* Set the Start Address register for the specific DMA channel
-* This function can be used for register based DMA,
-* to setup the start address
-* addr: Starting address of the DMA Data to be transferred.
-*-----------------------------------------------------------------------------*/
-void set_dma_start_addr(unsigned int channel, unsigned long addr)
-{
- pr_debug("set_dma_start_addr() : BEGIN \n");
- dma_ch[channel].regs->start_addr = addr;
- pr_debug("set_dma_start_addr() : END\n");
-}
-EXPORT_SYMBOL(set_dma_start_addr);
-
-void set_dma_next_desc_addr(unsigned int channel, unsigned long addr)
-{
- pr_debug("set_dma_next_desc_addr() : BEGIN \n");
- dma_ch[channel].regs->next_desc_ptr = addr;
- pr_debug("set_dma_next_desc_addr() : END\n");
-}
-EXPORT_SYMBOL(set_dma_next_desc_addr);
-
-void set_dma_curr_desc_addr(unsigned int channel, unsigned long addr)
-{
- pr_debug("set_dma_curr_desc_addr() : BEGIN \n");
- dma_ch[channel].regs->curr_desc_ptr = addr;
- pr_debug("set_dma_curr_desc_addr() : END\n");
-}
-EXPORT_SYMBOL(set_dma_curr_desc_addr);
-
-void set_dma_x_count(unsigned int channel, unsigned short x_count)
-{
- dma_ch[channel].regs->x_count = x_count;
-}
-EXPORT_SYMBOL(set_dma_x_count);
-
-void set_dma_y_count(unsigned int channel, unsigned short y_count)
-{
- dma_ch[channel].regs->y_count = y_count;
-}
-EXPORT_SYMBOL(set_dma_y_count);
-
-void set_dma_x_modify(unsigned int channel, short x_modify)
-{
- dma_ch[channel].regs->x_modify = x_modify;
-}
-EXPORT_SYMBOL(set_dma_x_modify);
-
-void set_dma_y_modify(unsigned int channel, short y_modify)
-{
- dma_ch[channel].regs->y_modify = y_modify;
-}
-EXPORT_SYMBOL(set_dma_y_modify);
-
-void set_dma_config(unsigned int channel, unsigned short config)
-{
- dma_ch[channel].regs->cfg = config;
-}
-EXPORT_SYMBOL(set_dma_config);
-
-unsigned short
-set_bfin_dma_config(char direction, char flow_mode,
- char intr_mode, char dma_mode, char width, char syncmode)
-{
- unsigned short config;
-
- config =
- ((direction << 1) | (width << 2) | (dma_mode << 4) |
- (intr_mode << 6) | (flow_mode << 12) | (syncmode << 5));
- return config;
-}
-EXPORT_SYMBOL(set_bfin_dma_config);
-
-void set_dma_sg(unsigned int channel, struct dmasg *sg, int nr_sg)
-{
- dma_ch[channel].regs->cfg |= ((nr_sg & 0x0F) << 8);
- dma_ch[channel].regs->next_desc_ptr = (unsigned int)sg;
-}
-EXPORT_SYMBOL(set_dma_sg);
-
-void set_dma_curr_addr(unsigned int channel, unsigned long addr)
-{
- dma_ch[channel].regs->curr_addr_ptr = addr;
-}
-EXPORT_SYMBOL(set_dma_curr_addr);
-
-/*------------------------------------------------------------------------------
- * Get the DMA status of a specific DMA channel from the system.
- *-----------------------------------------------------------------------------*/
-unsigned short get_dma_curr_irqstat(unsigned int channel)
-{
- return dma_ch[channel].regs->irq_status;
-}
-EXPORT_SYMBOL(get_dma_curr_irqstat);
-
-/*------------------------------------------------------------------------------
- * Clear the DMA_DONE bit in DMA status. Stop the DMA completion interrupt.
- *-----------------------------------------------------------------------------*/
-void clear_dma_irqstat(unsigned int channel)
-{
- dma_ch[channel].regs->irq_status |= 3;
-}
-EXPORT_SYMBOL(clear_dma_irqstat);
-
-/*------------------------------------------------------------------------------
- * Get current DMA xcount of a specific DMA channel from the system.
- *-----------------------------------------------------------------------------*/
-unsigned short get_dma_curr_xcount(unsigned int channel)
-{
- return dma_ch[channel].regs->curr_x_count;
-}
-EXPORT_SYMBOL(get_dma_curr_xcount);
-
-/*------------------------------------------------------------------------------
- * Get current DMA ycount of a specific DMA channel from the system.
- *-----------------------------------------------------------------------------*/
-unsigned short get_dma_curr_ycount(unsigned int channel)
-{
- return dma_ch[channel].regs->curr_y_count;
-}
-EXPORT_SYMBOL(get_dma_curr_ycount);
-
-unsigned long get_dma_next_desc_ptr(unsigned int channel)
-{
- return dma_ch[channel].regs->next_desc_ptr;
-}
-EXPORT_SYMBOL(get_dma_next_desc_ptr);
-
-unsigned long get_dma_curr_desc_ptr(unsigned int channel)
-{
- return dma_ch[channel].regs->curr_desc_ptr;
-}
-EXPORT_SYMBOL(get_dma_curr_desc_ptr);
-
-unsigned long get_dma_curr_addr(unsigned int channel)
-{
- return dma_ch[channel].regs->curr_addr_ptr;
-}
-EXPORT_SYMBOL(get_dma_curr_addr);
-
#ifdef CONFIG_PM
# ifndef MAX_DMA_SUSPEND_CHANNELS
# define MAX_DMA_SUSPEND_CHANNELS MAX_DMA_CHANNELS
spin_lock_irqsave(&mdma_lock, flags);
+ /* Force a sync in case a previous config reset on this channel
+ * occurred. This is needed so subsequent writes to DMA registers
+ * are not spuriously lost/corrupted. Do it under irq lock and
+ * without the anomaly version (because we are atomic already).
+ */
+ __builtin_bfin_ssync();
+
if (bfin_read_MDMA_S0_CONFIG())
while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE))
continue;
* _dma_memcpy - translate C memcpy settings into MDMA settings
*
* Handle all the high level steps before we touch the MDMA registers. So
- * handle caching, tweaking of sizes, and formatting of addresses.
+ * handle direction, tweaking of sizes, and formatting of addresses.
*/
static void *_dma_memcpy(void *pdst, const void *psrc, size_t size)
{
if (size == 0)
return NULL;
- if (bfin_addr_dcachable(src))
- blackfin_dcache_flush_range(src, src + size);
-
- if (bfin_addr_dcachable(dst))
- blackfin_dcache_invalidate_range(dst, dst + size);
-
if (dst % 4 == 0 && src % 4 == 0 && size % 4 == 0) {
conf = WDSIZE_32;
shift = 2;
* up into two pieces. The first transfer is in multiples of 64k and the
* second transfer is the piece smaller than 64k.
*/
-void *dma_memcpy(void *dst, const void *src, size_t size)
+void *dma_memcpy(void *pdst, const void *psrc, size_t size)
{
+ unsigned long dst = (unsigned long)pdst;
+ unsigned long src = (unsigned long)psrc;
size_t bulk, rest;
+
+ if (bfin_addr_dcachable(src))
+ blackfin_dcache_flush_range(src, src + size);
+
+ if (bfin_addr_dcachable(dst))
+ blackfin_dcache_invalidate_range(dst, dst + size);
+
bulk = size & ~0xffff;
rest = size - bulk;
if (bulk)
- _dma_memcpy(dst, src, bulk);
- _dma_memcpy(dst + bulk, src + bulk, rest);
- return dst;
+ _dma_memcpy(pdst, psrc, bulk);
+ _dma_memcpy(pdst + bulk, psrc + bulk, rest);
+ return pdst;
}
EXPORT_SYMBOL(dma_memcpy);
projects / linux-2.6-omap-h63xx.git / blobdiff