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dmaengine: sun6i: support parameterized compatible strings

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This patch adds support for hardware parameters tied to compatible
strings, so similar hardware can reuse the driver.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Chen-Yu Tsai 2014-11-07 12:15:46 +08:00 committed by Vinod Koul
parent 19bfc77265
commit 25a37c2f12
1 changed files with 60 additions and 34 deletions
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94
drivers/dma/sun6i-dma.c
View file

@ -18,6 +18,7 @@
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of_dma.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <linux/slab.h>
@ -25,24 +26,6 @@
#include "virt-dma.h"
/*
* There's 16 physical channels that can work in parallel.
*
* However we have 30 different endpoints for our requests.
*
* Since the channels are able to handle only an unidirectional
* transfer, we need to allocate more virtual channels so that
* everyone can grab one channel.
*
* Some devices can't work in both direction (mostly because it
* wouldn't make sense), so we have a bit fewer virtual channels than
* 2 channels per endpoints.
*/
#define NR_MAX_CHANNELS 16
#define NR_MAX_REQUESTS 30
#define NR_MAX_VCHANS 53
/*
* Common registers
*/
@ -101,6 +84,19 @@
#define NORMAL_WAIT 8
#define DRQ_SDRAM 1
/*
* Hardware channels / ports representation
*
* The hardware is used in several SoCs, with differing numbers
* of channels and endpoints. This structure ties those numbers
* to a certain compatible string.
*/
struct sun6i_dma_config {
u32 nr_max_channels;
u32 nr_max_requests;
u32 nr_max_vchans;
};
/*
* Hardware representation of the LLI
*
@ -159,6 +155,7 @@ struct sun6i_dma_dev {
struct dma_pool *pool;
struct sun6i_pchan *pchans;
struct sun6i_vchan *vchans;
const struct sun6i_dma_config *cfg;
};
static struct device *chan2dev(struct dma_chan *chan)
@ -432,6 +429,7 @@ static int sun6i_dma_start_desc(struct sun6i_vchan *vchan)
static void sun6i_dma_tasklet(unsigned long data)
{
struct sun6i_dma_dev *sdev = (struct sun6i_dma_dev *)data;
const struct sun6i_dma_config *cfg = sdev->cfg;
struct sun6i_vchan *vchan;
struct sun6i_pchan *pchan;
unsigned int pchan_alloc = 0;
@ -459,7 +457,7 @@ static void sun6i_dma_tasklet(unsigned long data)
}
spin_lock_irq(&sdev->lock);
for (pchan_idx = 0; pchan_idx < NR_MAX_CHANNELS; pchan_idx++) {
for (pchan_idx = 0; pchan_idx < cfg->nr_max_channels; pchan_idx++) {
pchan = &sdev->pchans[pchan_idx];
if (pchan->vchan || list_empty(&sdev->pending))
@ -480,7 +478,7 @@ static void sun6i_dma_tasklet(unsigned long data)
}
spin_unlock_irq(&sdev->lock);
for (pchan_idx = 0; pchan_idx < NR_MAX_CHANNELS; pchan_idx++) {
for (pchan_idx = 0; pchan_idx < cfg->nr_max_channels; pchan_idx++) {
if (!(pchan_alloc & BIT(pchan_idx)))
continue;
@ -502,7 +500,7 @@ static irqreturn_t sun6i_dma_interrupt(int irq, void *dev_id)
int i, j, ret = IRQ_NONE;
u32 status;
for (i = 0; i < 2; i++) {
for (i = 0; i < sdev->cfg->nr_max_channels / DMA_IRQ_CHAN_NR; i++) {
status = readl(sdev->base + DMA_IRQ_STAT(i));
if (!status)
continue;
@ -512,7 +510,7 @@ static irqreturn_t sun6i_dma_interrupt(int irq, void *dev_id)
writel(status, sdev->base + DMA_IRQ_STAT(i));
for (j = 0; (j < 8) && status; j++) {
for (j = 0; (j < DMA_IRQ_CHAN_NR) && status; j++) {
if (status & DMA_IRQ_QUEUE) {
pchan = sdev->pchans + j;
vchan = pchan->vchan;
@ -525,7 +523,7 @@ static irqreturn_t sun6i_dma_interrupt(int irq, void *dev_id)
}
}
status = status >> 4;
status = status >> DMA_IRQ_CHAN_WIDTH;
}
if (!atomic_read(&sdev->tasklet_shutdown))
@ -817,7 +815,7 @@ static struct dma_chan *sun6i_dma_of_xlate(struct of_phandle_args *dma_spec,
struct dma_chan *chan;
u8 port = dma_spec->args[0];
if (port > NR_MAX_REQUESTS)
if (port > sdev->cfg->nr_max_requests)
return NULL;
chan = dma_get_any_slave_channel(&sdev->slave);
@ -850,7 +848,7 @@ static inline void sun6i_dma_free(struct sun6i_dma_dev *sdev)
{
int i;
for (i = 0; i < NR_MAX_VCHANS; i++) {
for (i = 0; i < sdev->cfg->nr_max_vchans; i++) {
struct sun6i_vchan *vchan = &sdev->vchans[i];
list_del(&vchan->vc.chan.device_node);
@ -858,8 +856,36 @@ static inline void sun6i_dma_free(struct sun6i_dma_dev *sdev)
}
}
/*
* For A31:
*
* There's 16 physical channels that can work in parallel.
*
* However we have 30 different endpoints for our requests.
*
* Since the channels are able to handle only an unidirectional
* transfer, we need to allocate more virtual channels so that
* everyone can grab one channel.
*
* Some devices can't work in both direction (mostly because it
* wouldn't make sense), so we have a bit fewer virtual channels than
* 2 channels per endpoints.
*/
static struct sun6i_dma_config sun6i_a31_dma_cfg = {
.nr_max_channels = 16,
.nr_max_requests = 30,
.nr_max_vchans = 53,
};
static struct of_device_id sun6i_dma_match[] = {
{ .compatible = "allwinner,sun6i-a31-dma", .data = &sun6i_a31_dma_cfg },
{ /* sentinel */ }
};
static int sun6i_dma_probe(struct platform_device *pdev)
{
const struct of_device_id *device;
struct sun6i_dma_dev *sdc;
struct resource *res;
int ret, i;
@ -868,6 +894,11 @@ static int sun6i_dma_probe(struct platform_device *pdev)
if (!sdc)
return -ENOMEM;
device = of_match_device(sun6i_dma_match, &pdev->dev);
if (!device)
return -ENODEV;
sdc->cfg = device->data;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
sdc->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(sdc->base))
@ -917,26 +948,26 @@ static int sun6i_dma_probe(struct platform_device *pdev)
sdc->slave.dev = &pdev->dev;
sdc->pchans = devm_kcalloc(&pdev->dev, NR_MAX_CHANNELS,
sdc->pchans = devm_kcalloc(&pdev->dev, sdc->cfg->nr_max_channels,
sizeof(struct sun6i_pchan), GFP_KERNEL);
if (!sdc->pchans)
return -ENOMEM;
sdc->vchans = devm_kcalloc(&pdev->dev, NR_MAX_VCHANS,
sdc->vchans = devm_kcalloc(&pdev->dev, sdc->cfg->nr_max_vchans,
sizeof(struct sun6i_vchan), GFP_KERNEL);
if (!sdc->vchans)
return -ENOMEM;
tasklet_init(&sdc->task, sun6i_dma_tasklet, (unsigned long)sdc);
for (i = 0; i < NR_MAX_CHANNELS; i++) {
for (i = 0; i < sdc->cfg->nr_max_channels; i++) {
struct sun6i_pchan *pchan = &sdc->pchans[i];
pchan->idx = i;
pchan->base = sdc->base + 0x100 + i * 0x40;
}
for (i = 0; i < NR_MAX_VCHANS; i++) {
for (i = 0; i < sdc->cfg->nr_max_vchans; i++) {
struct sun6i_vchan *vchan = &sdc->vchans[i];
INIT_LIST_HEAD(&vchan->node);
@ -1008,11 +1039,6 @@ static int sun6i_dma_remove(struct platform_device *pdev)
return 0;
}
static struct of_device_id sun6i_dma_match[] = {
{ .compatible = "allwinner,sun6i-a31-dma" },
{ /* sentinel */ }
};
static struct platform_driver sun6i_dma_driver = {
.probe = sun6i_dma_probe,
.remove = sun6i_dma_remove,