276 lines
6.7 KiB
C
276 lines
6.7 KiB
C
/*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published
|
|
* by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
|
|
*
|
|
* Copyright (C) 2011 John Crispin <blogic@openwrt.org>
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/io.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/module.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/err.h>
|
|
|
|
#include <lantiq_soc.h>
|
|
#include <xway_dma.h>
|
|
|
|
#define LTQ_DMA_ID 0x08
|
|
#define LTQ_DMA_CTRL 0x10
|
|
#define LTQ_DMA_CPOLL 0x14
|
|
#define LTQ_DMA_CS 0x18
|
|
#define LTQ_DMA_CCTRL 0x1C
|
|
#define LTQ_DMA_CDBA 0x20
|
|
#define LTQ_DMA_CDLEN 0x24
|
|
#define LTQ_DMA_CIS 0x28
|
|
#define LTQ_DMA_CIE 0x2C
|
|
#define LTQ_DMA_PS 0x40
|
|
#define LTQ_DMA_PCTRL 0x44
|
|
#define LTQ_DMA_IRNEN 0xf4
|
|
|
|
#define DMA_DESCPT BIT(3) /* descriptor complete irq */
|
|
#define DMA_TX BIT(8) /* TX channel direction */
|
|
#define DMA_CHAN_ON BIT(0) /* channel on / off bit */
|
|
#define DMA_PDEN BIT(6) /* enable packet drop */
|
|
#define DMA_CHAN_RST BIT(1) /* channel on / off bit */
|
|
#define DMA_RESET BIT(0) /* channel on / off bit */
|
|
#define DMA_IRQ_ACK 0x7e /* IRQ status register */
|
|
#define DMA_POLL BIT(31) /* turn on channel polling */
|
|
#define DMA_CLK_DIV4 BIT(6) /* polling clock divider */
|
|
#define DMA_2W_BURST BIT(1) /* 2 word burst length */
|
|
#define DMA_MAX_CHANNEL 20 /* the soc has 20 channels */
|
|
#define DMA_ETOP_ENDIANNESS (0xf << 8) /* endianness swap etop channels */
|
|
#define DMA_WEIGHT (BIT(17) | BIT(16)) /* default channel wheight */
|
|
|
|
#define ltq_dma_r32(x) ltq_r32(ltq_dma_membase + (x))
|
|
#define ltq_dma_w32(x, y) ltq_w32(x, ltq_dma_membase + (y))
|
|
#define ltq_dma_w32_mask(x, y, z) ltq_w32_mask(x, y, \
|
|
ltq_dma_membase + (z))
|
|
|
|
static void __iomem *ltq_dma_membase;
|
|
|
|
void
|
|
ltq_dma_enable_irq(struct ltq_dma_channel *ch)
|
|
{
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
ltq_dma_w32(ch->nr, LTQ_DMA_CS);
|
|
ltq_dma_w32_mask(0, 1 << ch->nr, LTQ_DMA_IRNEN);
|
|
local_irq_restore(flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ltq_dma_enable_irq);
|
|
|
|
void
|
|
ltq_dma_disable_irq(struct ltq_dma_channel *ch)
|
|
{
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
ltq_dma_w32(ch->nr, LTQ_DMA_CS);
|
|
ltq_dma_w32_mask(1 << ch->nr, 0, LTQ_DMA_IRNEN);
|
|
local_irq_restore(flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ltq_dma_disable_irq);
|
|
|
|
void
|
|
ltq_dma_ack_irq(struct ltq_dma_channel *ch)
|
|
{
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
ltq_dma_w32(ch->nr, LTQ_DMA_CS);
|
|
ltq_dma_w32(DMA_IRQ_ACK, LTQ_DMA_CIS);
|
|
local_irq_restore(flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ltq_dma_ack_irq);
|
|
|
|
void
|
|
ltq_dma_open(struct ltq_dma_channel *ch)
|
|
{
|
|
unsigned long flag;
|
|
|
|
local_irq_save(flag);
|
|
ltq_dma_w32(ch->nr, LTQ_DMA_CS);
|
|
ltq_dma_w32_mask(0, DMA_CHAN_ON, LTQ_DMA_CCTRL);
|
|
ltq_dma_enable_irq(ch);
|
|
local_irq_restore(flag);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ltq_dma_open);
|
|
|
|
void
|
|
ltq_dma_close(struct ltq_dma_channel *ch)
|
|
{
|
|
unsigned long flag;
|
|
|
|
local_irq_save(flag);
|
|
ltq_dma_w32(ch->nr, LTQ_DMA_CS);
|
|
ltq_dma_w32_mask(DMA_CHAN_ON, 0, LTQ_DMA_CCTRL);
|
|
ltq_dma_disable_irq(ch);
|
|
local_irq_restore(flag);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ltq_dma_close);
|
|
|
|
static void
|
|
ltq_dma_alloc(struct ltq_dma_channel *ch)
|
|
{
|
|
unsigned long flags;
|
|
|
|
ch->desc = 0;
|
|
ch->desc_base = dma_alloc_coherent(NULL,
|
|
LTQ_DESC_NUM * LTQ_DESC_SIZE,
|
|
&ch->phys, GFP_ATOMIC);
|
|
memset(ch->desc_base, 0, LTQ_DESC_NUM * LTQ_DESC_SIZE);
|
|
|
|
local_irq_save(flags);
|
|
ltq_dma_w32(ch->nr, LTQ_DMA_CS);
|
|
ltq_dma_w32(ch->phys, LTQ_DMA_CDBA);
|
|
ltq_dma_w32(LTQ_DESC_NUM, LTQ_DMA_CDLEN);
|
|
ltq_dma_w32_mask(DMA_CHAN_ON, 0, LTQ_DMA_CCTRL);
|
|
wmb();
|
|
ltq_dma_w32_mask(0, DMA_CHAN_RST, LTQ_DMA_CCTRL);
|
|
while (ltq_dma_r32(LTQ_DMA_CCTRL) & DMA_CHAN_RST)
|
|
;
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
void
|
|
ltq_dma_alloc_tx(struct ltq_dma_channel *ch)
|
|
{
|
|
unsigned long flags;
|
|
|
|
ltq_dma_alloc(ch);
|
|
|
|
local_irq_save(flags);
|
|
ltq_dma_w32(DMA_DESCPT, LTQ_DMA_CIE);
|
|
ltq_dma_w32_mask(0, 1 << ch->nr, LTQ_DMA_IRNEN);
|
|
ltq_dma_w32(DMA_WEIGHT | DMA_TX, LTQ_DMA_CCTRL);
|
|
local_irq_restore(flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ltq_dma_alloc_tx);
|
|
|
|
void
|
|
ltq_dma_alloc_rx(struct ltq_dma_channel *ch)
|
|
{
|
|
unsigned long flags;
|
|
|
|
ltq_dma_alloc(ch);
|
|
|
|
local_irq_save(flags);
|
|
ltq_dma_w32(DMA_DESCPT, LTQ_DMA_CIE);
|
|
ltq_dma_w32_mask(0, 1 << ch->nr, LTQ_DMA_IRNEN);
|
|
ltq_dma_w32(DMA_WEIGHT, LTQ_DMA_CCTRL);
|
|
local_irq_restore(flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ltq_dma_alloc_rx);
|
|
|
|
void
|
|
ltq_dma_free(struct ltq_dma_channel *ch)
|
|
{
|
|
if (!ch->desc_base)
|
|
return;
|
|
ltq_dma_close(ch);
|
|
dma_free_coherent(NULL, LTQ_DESC_NUM * LTQ_DESC_SIZE,
|
|
ch->desc_base, ch->phys);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ltq_dma_free);
|
|
|
|
void
|
|
ltq_dma_init_port(int p)
|
|
{
|
|
ltq_dma_w32(p, LTQ_DMA_PS);
|
|
switch (p) {
|
|
case DMA_PORT_ETOP:
|
|
/*
|
|
* Tell the DMA engine to swap the endianness of data frames and
|
|
* drop packets if the channel arbitration fails.
|
|
*/
|
|
ltq_dma_w32_mask(0, DMA_ETOP_ENDIANNESS | DMA_PDEN,
|
|
LTQ_DMA_PCTRL);
|
|
break;
|
|
|
|
case DMA_PORT_DEU:
|
|
ltq_dma_w32((DMA_2W_BURST << 4) | (DMA_2W_BURST << 2),
|
|
LTQ_DMA_PCTRL);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(ltq_dma_init_port);
|
|
|
|
static int
|
|
ltq_dma_init(struct platform_device *pdev)
|
|
{
|
|
struct clk *clk;
|
|
struct resource *res;
|
|
unsigned id;
|
|
int i;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
ltq_dma_membase = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(ltq_dma_membase))
|
|
panic("Failed to remap dma resource");
|
|
|
|
/* power up and reset the dma engine */
|
|
clk = clk_get(&pdev->dev, NULL);
|
|
if (IS_ERR(clk))
|
|
panic("Failed to get dma clock");
|
|
|
|
clk_enable(clk);
|
|
ltq_dma_w32_mask(0, DMA_RESET, LTQ_DMA_CTRL);
|
|
|
|
/* disable all interrupts */
|
|
ltq_dma_w32(0, LTQ_DMA_IRNEN);
|
|
|
|
/* reset/configure each channel */
|
|
for (i = 0; i < DMA_MAX_CHANNEL; i++) {
|
|
ltq_dma_w32(i, LTQ_DMA_CS);
|
|
ltq_dma_w32(DMA_CHAN_RST, LTQ_DMA_CCTRL);
|
|
ltq_dma_w32(DMA_POLL | DMA_CLK_DIV4, LTQ_DMA_CPOLL);
|
|
ltq_dma_w32_mask(DMA_CHAN_ON, 0, LTQ_DMA_CCTRL);
|
|
}
|
|
|
|
id = ltq_dma_r32(LTQ_DMA_ID);
|
|
dev_info(&pdev->dev,
|
|
"Init done - hw rev: %X, ports: %d, channels: %d\n",
|
|
id & 0x1f, (id >> 16) & 0xf, id >> 20);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id dma_match[] = {
|
|
{ .compatible = "lantiq,dma-xway" },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, dma_match);
|
|
|
|
static struct platform_driver dma_driver = {
|
|
.probe = ltq_dma_init,
|
|
.driver = {
|
|
.name = "dma-xway",
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = dma_match,
|
|
},
|
|
};
|
|
|
|
int __init
|
|
dma_init(void)
|
|
{
|
|
return platform_driver_register(&dma_driver);
|
|
}
|
|
|
|
postcore_initcall(dma_init);
|