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linux/arch/mips/au1000/common/dma.c
Sergei Shtylyov c1dcb14ec2 [MIPS] Alchemy common code style cleanup 
Fix many errors and warnings given by checkpatch.pl:

- use of C99 // comments;

- missing space between the type and asterisk in a variable declaration;

- space between the asterisk and function/variable name;

- leading spaces instead of tabs;

- space after opening and before closing parentheses;

- initialization of a 'static' variable to 0;

- missing spaces around assignement/comparison operator;

- brace not on the same line with condition (or 'else') in the 'if'/'switch'
  statement;

- missing space between 'if'/'for'/'while' and opening parenthesis;

- use of assignement in 'if' statement's condition;

- printk() without KERN_* facility level;

- EXPORT_SYMBOL() not following its function immediately;

- unnecessary braces for single-statement block;

- adding new 'typedef' (where including <linux/types.h> will do);

- use of 'extern' in the .c file (where it can be avoided by including header);

- line over 80 characters.

In addition to these changes, also do the following:

- insert missing space after opening brace and/or before closing brace in the
  structure initializers;

- insert spaces between operator and its operands;

- put the function's result type and name/parameters on the same line;

- properly indent multi-line expressions;

- remove commented out code;

- remove useless initializers and code;

- remove needless parentheses;

- fix broken/excess indentation;

- add missing spaces between operator and its operands;

- insert missing and remove excess new lines;

- group 'else' and 'if' together where possible;

- make au1xxx_platform_init() 'static';

- regroup variable declarations in pm_do_freq() for prettier look;

- replace numeric literals with the matching macros;

- fix printk() format specifiers mismatching the argument types;

- make the multi-line comment style consistent with the kernel style elsewhere
  by adding empty first line and/or adding space on their left side;

- make two-line comments that only have one line of text one-line;

- fix typos/errors, capitalize acronyms, etc. in the comments;

- fix/remove obsolete references in the comments;

- reformat some comments;

- add comment about the CPU:counter clock ratio to calc_clock();

- update MontaVista copyright;

- remove Pete Popov's and Steve Longerbeam's old email addresses...

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2008-05-12 16:46:52 +01:00

238 lines
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/*
*
* BRIEF MODULE DESCRIPTION
* A DMA channel allocator for Au1x00. API is modeled loosely off of
* linux/kernel/dma.c.
*
* Copyright 2000, 2008 MontaVista Software Inc.
* Author: MontaVista Software, Inc. <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/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/spinlock.h>
#include <linux/interrupt.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++) {
chan = get_dma_chan(i);
if (chan != NULL)
len += sprintf(buf + len, "%2d: %s\n",
i, chan->dev_str);
}
if (fpos >= len) {
*start = buf;
*eof = 1;
return 0;
}
*start = buf + fpos;
len -= fpos;
if (len > 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,
irq_handler_t irqhandler,
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;
ret = request_irq(chan->irq, irqhandler, irqflags, dev_str,
chan->irq_dev);
if (ret) {
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(KERN_ERR "Error 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 */
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