diff options
Diffstat (limited to 'arch/blackfin/kernel')
| -rw-r--r-- | arch/blackfin/kernel/bfin_dma_5xx.c | 233 |
1 files changed, 21 insertions, 212 deletions
diff --git a/arch/blackfin/kernel/bfin_dma_5xx.c b/arch/blackfin/kernel/bfin_dma_5xx.c index ed7d2859a626..917b5b8e32c8 100644 --- a/arch/blackfin/kernel/bfin_dma_5xx.c +++ b/arch/blackfin/kernel/bfin_dma_5xx.c @@ -1,7 +1,7 @@ /* * 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. */ @@ -20,22 +20,8 @@ #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) { @@ -92,9 +78,11 @@ static int __init proc_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"); @@ -172,6 +160,19 @@ int set_dma_callback(unsigned int channel, irq_handler_t callback, void *data) } 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"); @@ -194,198 +195,6 @@ void free_dma(unsigned int channel) } 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 |