242 lines
7 KiB
C
242 lines
7 KiB
C
/*
|
|
*
|
|
* BRIEF MODULE DESCRIPTION
|
|
* A DMA channel allocator for Au1000. API is modeled loosely off of
|
|
* linux/kernel/dma.c.
|
|
*
|
|
* Copyright 2000 MontaVista Software Inc.
|
|
* Author: MontaVista Software, Inc.
|
|
* stevel@mvista.com or source@mvista.com
|
|
* Copyright (C) 2005 Ralf Baechle (ralf@linux-mips.org)
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
|
|
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
|
|
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
|
|
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
*/
|
|
#include <linux/config.h>
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/string.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/interrupt.h>
|
|
#include <asm/system.h>
|
|
#include <asm/mach-au1x00/au1000.h>
|
|
#include <asm/mach-au1x00/au1000_dma.h>
|
|
|
|
#if defined(CONFIG_SOC_AU1000) || defined(CONFIG_SOC_AU1500) || defined(CONFIG_SOC_AU1100)
|
|
/*
|
|
* A note on resource allocation:
|
|
*
|
|
* All drivers needing DMA channels, should allocate and release them
|
|
* through the public routines `request_dma()' and `free_dma()'.
|
|
*
|
|
* In order to avoid problems, all processes should allocate resources in
|
|
* the same sequence and release them in the reverse order.
|
|
*
|
|
* So, when allocating DMAs and IRQs, first allocate the DMA, then the IRQ.
|
|
* When releasing them, first release the IRQ, then release the DMA. The
|
|
* main reason for this order is that, if you are requesting the DMA buffer
|
|
* done interrupt, you won't know the irq number until the DMA channel is
|
|
* returned from request_dma.
|
|
*/
|
|
|
|
|
|
DEFINE_SPINLOCK(au1000_dma_spin_lock);
|
|
|
|
struct dma_chan au1000_dma_table[NUM_AU1000_DMA_CHANNELS] = {
|
|
{.dev_id = -1,},
|
|
{.dev_id = -1,},
|
|
{.dev_id = -1,},
|
|
{.dev_id = -1,},
|
|
{.dev_id = -1,},
|
|
{.dev_id = -1,},
|
|
{.dev_id = -1,},
|
|
{.dev_id = -1,}
|
|
};
|
|
EXPORT_SYMBOL(au1000_dma_table);
|
|
|
|
// Device FIFO addresses and default DMA modes
|
|
static const struct dma_dev {
|
|
unsigned int fifo_addr;
|
|
unsigned int dma_mode;
|
|
} dma_dev_table[DMA_NUM_DEV] = {
|
|
{UART0_ADDR + UART_TX, 0},
|
|
{UART0_ADDR + UART_RX, 0},
|
|
{0, 0},
|
|
{0, 0},
|
|
{AC97C_DATA, DMA_DW16 }, // coherent
|
|
{AC97C_DATA, DMA_DR | DMA_DW16 }, // coherent
|
|
{UART3_ADDR + UART_TX, DMA_DW8 | DMA_NC},
|
|
{UART3_ADDR + UART_RX, DMA_DR | DMA_DW8 | DMA_NC},
|
|
{USBD_EP0RD, DMA_DR | DMA_DW8 | DMA_NC},
|
|
{USBD_EP0WR, DMA_DW8 | DMA_NC},
|
|
{USBD_EP2WR, DMA_DW8 | DMA_NC},
|
|
{USBD_EP3WR, DMA_DW8 | DMA_NC},
|
|
{USBD_EP4RD, DMA_DR | DMA_DW8 | DMA_NC},
|
|
{USBD_EP5RD, DMA_DR | DMA_DW8 | DMA_NC},
|
|
{I2S_DATA, DMA_DW32 | DMA_NC},
|
|
{I2S_DATA, DMA_DR | DMA_DW32 | DMA_NC}
|
|
};
|
|
|
|
int au1000_dma_read_proc(char *buf, char **start, off_t fpos,
|
|
int length, int *eof, void *data)
|
|
{
|
|
int i, len = 0;
|
|
struct dma_chan *chan;
|
|
|
|
for (i = 0; i < NUM_AU1000_DMA_CHANNELS; i++) {
|
|
if ((chan = get_dma_chan(i)) != NULL) {
|
|
len += sprintf(buf + len, "%2d: %s\n",
|
|
i, chan->dev_str);
|
|
}
|
|
}
|
|
|
|
if (fpos >= len) {
|
|
*start = buf;
|
|
*eof = 1;
|
|
return 0;
|
|
}
|
|
*start = buf + fpos;
|
|
if ((len -= fpos) > length)
|
|
return length;
|
|
*eof = 1;
|
|
return len;
|
|
}
|
|
|
|
// Device FIFO addresses and default DMA modes - 2nd bank
|
|
static const struct dma_dev dma_dev_table_bank2[DMA_NUM_DEV_BANK2] = {
|
|
{SD0_XMIT_FIFO, DMA_DS | DMA_DW8}, // coherent
|
|
{SD0_RECV_FIFO, DMA_DS | DMA_DR | DMA_DW8}, // coherent
|
|
{SD1_XMIT_FIFO, DMA_DS | DMA_DW8}, // coherent
|
|
{SD1_RECV_FIFO, DMA_DS | DMA_DR | DMA_DW8} // coherent
|
|
};
|
|
|
|
void dump_au1000_dma_channel(unsigned int dmanr)
|
|
{
|
|
struct dma_chan *chan;
|
|
|
|
if (dmanr >= NUM_AU1000_DMA_CHANNELS)
|
|
return;
|
|
chan = &au1000_dma_table[dmanr];
|
|
|
|
printk(KERN_INFO "Au1000 DMA%d Register Dump:\n", dmanr);
|
|
printk(KERN_INFO " mode = 0x%08x\n",
|
|
au_readl(chan->io + DMA_MODE_SET));
|
|
printk(KERN_INFO " addr = 0x%08x\n",
|
|
au_readl(chan->io + DMA_PERIPHERAL_ADDR));
|
|
printk(KERN_INFO " start0 = 0x%08x\n",
|
|
au_readl(chan->io + DMA_BUFFER0_START));
|
|
printk(KERN_INFO " start1 = 0x%08x\n",
|
|
au_readl(chan->io + DMA_BUFFER1_START));
|
|
printk(KERN_INFO " count0 = 0x%08x\n",
|
|
au_readl(chan->io + DMA_BUFFER0_COUNT));
|
|
printk(KERN_INFO " count1 = 0x%08x\n",
|
|
au_readl(chan->io + DMA_BUFFER1_COUNT));
|
|
}
|
|
|
|
|
|
/*
|
|
* Finds a free channel, and binds the requested device to it.
|
|
* Returns the allocated channel number, or negative on error.
|
|
* Requests the DMA done IRQ if irqhandler != NULL.
|
|
*/
|
|
int request_au1000_dma(int dev_id, const char *dev_str,
|
|
irqreturn_t (*irqhandler)(int, void *, struct pt_regs *),
|
|
unsigned long irqflags,
|
|
void *irq_dev_id)
|
|
{
|
|
struct dma_chan *chan;
|
|
const struct dma_dev *dev;
|
|
int i, ret;
|
|
|
|
#if defined(CONFIG_SOC_AU1100)
|
|
if (dev_id < 0 || dev_id >= (DMA_NUM_DEV + DMA_NUM_DEV_BANK2))
|
|
return -EINVAL;
|
|
#else
|
|
if (dev_id < 0 || dev_id >= DMA_NUM_DEV)
|
|
return -EINVAL;
|
|
#endif
|
|
|
|
for (i = 0; i < NUM_AU1000_DMA_CHANNELS; i++) {
|
|
if (au1000_dma_table[i].dev_id < 0)
|
|
break;
|
|
}
|
|
if (i == NUM_AU1000_DMA_CHANNELS)
|
|
return -ENODEV;
|
|
|
|
chan = &au1000_dma_table[i];
|
|
|
|
if (dev_id >= DMA_NUM_DEV) {
|
|
dev_id -= DMA_NUM_DEV;
|
|
dev = &dma_dev_table_bank2[dev_id];
|
|
} else {
|
|
dev = &dma_dev_table[dev_id];
|
|
}
|
|
|
|
if (irqhandler) {
|
|
chan->irq = AU1000_DMA_INT_BASE + i;
|
|
chan->irq_dev = irq_dev_id;
|
|
if ((ret = request_irq(chan->irq, irqhandler, irqflags,
|
|
dev_str, chan->irq_dev))) {
|
|
chan->irq = 0;
|
|
chan->irq_dev = NULL;
|
|
return ret;
|
|
}
|
|
} else {
|
|
chan->irq = 0;
|
|
chan->irq_dev = NULL;
|
|
}
|
|
|
|
// fill it in
|
|
chan->io = DMA_CHANNEL_BASE + i * DMA_CHANNEL_LEN;
|
|
chan->dev_id = dev_id;
|
|
chan->dev_str = dev_str;
|
|
chan->fifo_addr = dev->fifo_addr;
|
|
chan->mode = dev->dma_mode;
|
|
|
|
/* initialize the channel before returning */
|
|
init_dma(i);
|
|
|
|
return i;
|
|
}
|
|
EXPORT_SYMBOL(request_au1000_dma);
|
|
|
|
void free_au1000_dma(unsigned int dmanr)
|
|
{
|
|
struct dma_chan *chan = get_dma_chan(dmanr);
|
|
if (!chan) {
|
|
printk("Trying to free DMA%d\n", dmanr);
|
|
return;
|
|
}
|
|
|
|
disable_dma(dmanr);
|
|
if (chan->irq)
|
|
free_irq(chan->irq, chan->irq_dev);
|
|
|
|
chan->irq = 0;
|
|
chan->irq_dev = NULL;
|
|
chan->dev_id = -1;
|
|
}
|
|
EXPORT_SYMBOL(free_au1000_dma);
|
|
|
|
#endif // AU1000 AU1500 AU1100
|