dmaengine: sun6i: support parameterized compatible strings
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
Vinod Koul
Родитель
19bfc77265
Коммит
25a37c2f12
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@ -18,6 +18,7 @@
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/of_dma.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/reset.h>
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#include <linux/slab.h>
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@ -25,24 +26,6 @@
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#include "virt-dma.h"
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/*
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* There's 16 physical channels that can work in parallel.
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*
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* However we have 30 different endpoints for our requests.
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*
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* Since the channels are able to handle only an unidirectional
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* transfer, we need to allocate more virtual channels so that
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* everyone can grab one channel.
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*
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* Some devices can't work in both direction (mostly because it
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* wouldn't make sense), so we have a bit fewer virtual channels than
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* 2 channels per endpoints.
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*/
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#define NR_MAX_CHANNELS 16
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#define NR_MAX_REQUESTS 30
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#define NR_MAX_VCHANS 53
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/*
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* Common registers
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*/
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@ -101,6 +84,19 @@
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#define NORMAL_WAIT 8
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#define DRQ_SDRAM 1
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/*
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* Hardware channels / ports representation
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*
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* The hardware is used in several SoCs, with differing numbers
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* of channels and endpoints. This structure ties those numbers
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* to a certain compatible string.
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*/
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struct sun6i_dma_config {
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u32 nr_max_channels;
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u32 nr_max_requests;
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u32 nr_max_vchans;
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};
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/*
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* Hardware representation of the LLI
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*
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@ -159,6 +155,7 @@ struct sun6i_dma_dev {
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struct dma_pool *pool;
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struct sun6i_pchan *pchans;
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struct sun6i_vchan *vchans;
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const struct sun6i_dma_config *cfg;
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};
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static struct device *chan2dev(struct dma_chan *chan)
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@ -432,6 +429,7 @@ static int sun6i_dma_start_desc(struct sun6i_vchan *vchan)
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static void sun6i_dma_tasklet(unsigned long data)
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{
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struct sun6i_dma_dev *sdev = (struct sun6i_dma_dev *)data;
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const struct sun6i_dma_config *cfg = sdev->cfg;
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struct sun6i_vchan *vchan;
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struct sun6i_pchan *pchan;
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unsigned int pchan_alloc = 0;
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@ -459,7 +457,7 @@ static void sun6i_dma_tasklet(unsigned long data)
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}
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spin_lock_irq(&sdev->lock);
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for (pchan_idx = 0; pchan_idx < NR_MAX_CHANNELS; pchan_idx++) {
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for (pchan_idx = 0; pchan_idx < cfg->nr_max_channels; pchan_idx++) {
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pchan = &sdev->pchans[pchan_idx];
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if (pchan->vchan || list_empty(&sdev->pending))
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@ -480,7 +478,7 @@ static void sun6i_dma_tasklet(unsigned long data)
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}
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spin_unlock_irq(&sdev->lock);
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for (pchan_idx = 0; pchan_idx < NR_MAX_CHANNELS; pchan_idx++) {
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for (pchan_idx = 0; pchan_idx < cfg->nr_max_channels; pchan_idx++) {
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if (!(pchan_alloc & BIT(pchan_idx)))
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continue;
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@ -502,7 +500,7 @@ static irqreturn_t sun6i_dma_interrupt(int irq, void *dev_id)
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int i, j, ret = IRQ_NONE;
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u32 status;
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for (i = 0; i < 2; i++) {
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for (i = 0; i < sdev->cfg->nr_max_channels / DMA_IRQ_CHAN_NR; i++) {
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status = readl(sdev->base + DMA_IRQ_STAT(i));
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if (!status)
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continue;
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@ -512,7 +510,7 @@ static irqreturn_t sun6i_dma_interrupt(int irq, void *dev_id)
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writel(status, sdev->base + DMA_IRQ_STAT(i));
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for (j = 0; (j < 8) && status; j++) {
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for (j = 0; (j < DMA_IRQ_CHAN_NR) && status; j++) {
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if (status & DMA_IRQ_QUEUE) {
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pchan = sdev->pchans + j;
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vchan = pchan->vchan;
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@ -525,7 +523,7 @@ static irqreturn_t sun6i_dma_interrupt(int irq, void *dev_id)
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}
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}
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status = status >> 4;
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status = status >> DMA_IRQ_CHAN_WIDTH;
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}
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if (!atomic_read(&sdev->tasklet_shutdown))
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@ -817,7 +815,7 @@ static struct dma_chan *sun6i_dma_of_xlate(struct of_phandle_args *dma_spec,
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struct dma_chan *chan;
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u8 port = dma_spec->args[0];
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if (port > NR_MAX_REQUESTS)
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if (port > sdev->cfg->nr_max_requests)
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return NULL;
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chan = dma_get_any_slave_channel(&sdev->slave);
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@ -850,7 +848,7 @@ static inline void sun6i_dma_free(struct sun6i_dma_dev *sdev)
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{
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int i;
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for (i = 0; i < NR_MAX_VCHANS; i++) {
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for (i = 0; i < sdev->cfg->nr_max_vchans; i++) {
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struct sun6i_vchan *vchan = &sdev->vchans[i];
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list_del(&vchan->vc.chan.device_node);
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@ -858,8 +856,36 @@ static inline void sun6i_dma_free(struct sun6i_dma_dev *sdev)
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}
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}
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/*
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* For A31:
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*
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* There's 16 physical channels that can work in parallel.
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*
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* However we have 30 different endpoints for our requests.
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*
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* Since the channels are able to handle only an unidirectional
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* transfer, we need to allocate more virtual channels so that
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* everyone can grab one channel.
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*
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* Some devices can't work in both direction (mostly because it
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* wouldn't make sense), so we have a bit fewer virtual channels than
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* 2 channels per endpoints.
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*/
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static struct sun6i_dma_config sun6i_a31_dma_cfg = {
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.nr_max_channels = 16,
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.nr_max_requests = 30,
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.nr_max_vchans = 53,
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};
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static struct of_device_id sun6i_dma_match[] = {
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{ .compatible = "allwinner,sun6i-a31-dma", .data = &sun6i_a31_dma_cfg },
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{ /* sentinel */ }
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};
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static int sun6i_dma_probe(struct platform_device *pdev)
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{
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const struct of_device_id *device;
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struct sun6i_dma_dev *sdc;
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struct resource *res;
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int ret, i;
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@ -868,6 +894,11 @@ static int sun6i_dma_probe(struct platform_device *pdev)
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if (!sdc)
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return -ENOMEM;
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device = of_match_device(sun6i_dma_match, &pdev->dev);
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if (!device)
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return -ENODEV;
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sdc->cfg = device->data;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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sdc->base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(sdc->base))
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@ -917,26 +948,26 @@ static int sun6i_dma_probe(struct platform_device *pdev)
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sdc->slave.dev = &pdev->dev;
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sdc->pchans = devm_kcalloc(&pdev->dev, NR_MAX_CHANNELS,
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sdc->pchans = devm_kcalloc(&pdev->dev, sdc->cfg->nr_max_channels,
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sizeof(struct sun6i_pchan), GFP_KERNEL);
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if (!sdc->pchans)
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return -ENOMEM;
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sdc->vchans = devm_kcalloc(&pdev->dev, NR_MAX_VCHANS,
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sdc->vchans = devm_kcalloc(&pdev->dev, sdc->cfg->nr_max_vchans,
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sizeof(struct sun6i_vchan), GFP_KERNEL);
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if (!sdc->vchans)
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return -ENOMEM;
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tasklet_init(&sdc->task, sun6i_dma_tasklet, (unsigned long)sdc);
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for (i = 0; i < NR_MAX_CHANNELS; i++) {
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for (i = 0; i < sdc->cfg->nr_max_channels; i++) {
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struct sun6i_pchan *pchan = &sdc->pchans[i];
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pchan->idx = i;
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pchan->base = sdc->base + 0x100 + i * 0x40;
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}
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for (i = 0; i < NR_MAX_VCHANS; i++) {
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for (i = 0; i < sdc->cfg->nr_max_vchans; i++) {
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struct sun6i_vchan *vchan = &sdc->vchans[i];
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INIT_LIST_HEAD(&vchan->node);
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@ -1008,11 +1039,6 @@ static int sun6i_dma_remove(struct platform_device *pdev)
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return 0;
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}
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static struct of_device_id sun6i_dma_match[] = {
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{ .compatible = "allwinner,sun6i-a31-dma" },
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{ /* sentinel */ }
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};
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static struct platform_driver sun6i_dma_driver = {
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.probe = sun6i_dma_probe,
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.remove = sun6i_dma_remove,
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