#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
#include "at_hdmac_regs.h"
*/
static struct dma_async_tx_descriptor *
atc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
- unsigned int sg_len, enum dma_data_direction direction,
+ unsigned int sg_len, enum dma_transfer_direction direction,
unsigned long flags)
{
struct at_dma_chan *atchan = to_at_dma_chan(chan);
dev_vdbg(chan2dev(chan), "prep_slave_sg (%d): %s f0x%lx\n",
sg_len,
- direction == DMA_TO_DEVICE ? "TO DEVICE" : "FROM DEVICE",
+ direction == DMA_MEM_TO_DEV ? "TO DEVICE" : "FROM DEVICE",
flags);
if (unlikely(!atslave || !sg_len)) {
ctrlb = ATC_IEN;
switch (direction) {
- case DMA_TO_DEVICE:
+ case DMA_MEM_TO_DEV:
ctrla |= ATC_DST_WIDTH(reg_width);
ctrlb |= ATC_DST_ADDR_MODE_FIXED
| ATC_SRC_ADDR_MODE_INCR
total_len += len;
}
break;
- case DMA_FROM_DEVICE:
+ case DMA_DEV_TO_MEM:
ctrla |= ATC_SRC_WIDTH(reg_width);
ctrlb |= ATC_DST_ADDR_MODE_INCR
| ATC_SRC_ADDR_MODE_FIXED
*/
static int
atc_dma_cyclic_check_values(unsigned int reg_width, dma_addr_t buf_addr,
- size_t period_len, enum dma_data_direction direction)
+ size_t period_len, enum dma_transfer_direction direction)
{
if (period_len > (ATC_BTSIZE_MAX << reg_width))
goto err_out;
goto err_out;
if (unlikely(buf_addr & ((1 << reg_width) - 1)))
goto err_out;
- if (unlikely(!(direction & (DMA_TO_DEVICE | DMA_FROM_DEVICE))))
+ if (unlikely(!(direction & (DMA_DEV_TO_MEM | DMA_MEM_TO_DEV))))
goto err_out;
return 0;
static int
atc_dma_cyclic_fill_desc(struct at_dma_slave *atslave, struct at_desc *desc,
unsigned int period_index, dma_addr_t buf_addr,
- size_t period_len, enum dma_data_direction direction)
+ size_t period_len, enum dma_transfer_direction direction)
{
u32 ctrla;
unsigned int reg_width = atslave->reg_width;
| period_len >> reg_width;
switch (direction) {
- case DMA_TO_DEVICE:
+ case DMA_MEM_TO_DEV:
desc->lli.saddr = buf_addr + (period_len * period_index);
desc->lli.daddr = atslave->tx_reg;
desc->lli.ctrla = ctrla;
| ATC_DIF(AT_DMA_PER_IF);
break;
- case DMA_FROM_DEVICE:
+ case DMA_DEV_TO_MEM:
desc->lli.saddr = atslave->rx_reg;
desc->lli.daddr = buf_addr + (period_len * period_index);
desc->lli.ctrla = ctrla;
*/
static struct dma_async_tx_descriptor *
atc_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
- size_t period_len, enum dma_data_direction direction)
+ size_t period_len, enum dma_transfer_direction direction)
{
struct at_dma_chan *atchan = to_at_dma_chan(chan);
struct at_dma_slave *atslave = chan->private;
unsigned int i;
dev_vdbg(chan2dev(chan), "prep_dma_cyclic: %s buf@0x%08x - %d (%d/%d)\n",
- direction == DMA_TO_DEVICE ? "TO DEVICE" : "FROM DEVICE",
+ direction == DMA_MEM_TO_DEV ? "TO DEVICE" : "FROM DEVICE",
buf_addr,
periods, buf_len, period_len);
/*-- Module Management -----------------------------------------------*/
+#if defined(CONFIG_OF)
+static const struct of_device_id atmel_dma_dt_ids[] = {
+ {
+ .compatible = "atmel,at91sam9rl-dma",
+ .data = (void *)ATDMA_DEVTYPE_SAM9RL
+ }, {
+ .compatible = "atmel,at91sam9g45-dma",
+ .data = (void *)ATDMA_DEVTYPE_SAM9G45
+ }, { /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, atmel_dma_dt_ids);
+#endif
+
+static struct platform_device_id atdma_devtypes[] = {
+ {
+ .name = "at91sam9rl_dma",
+ .driver_data = ATDMA_DEVTYPE_SAM9RL,
+ }, {
+ .name = "at91sam9g45_dma",
+ .driver_data = ATDMA_DEVTYPE_SAM9G45,
+ }, {
+ /* sentinel */
+ }
+};
+
+static inline enum atdma_devtype __init at_dma_get_driver_data(
+ struct platform_device *pdev)
+{
+ if (pdev->dev.of_node) {
+ const struct of_device_id *match;
+ match = of_match_node(atmel_dma_dt_ids, pdev->dev.of_node);
+ if (match == NULL)
+ return ATDMA_DEVTYPE_UNDEFINED;
+ return (enum atdma_devtype)match->data;
+ }
+ return platform_get_device_id(pdev)->driver_data;
+}
+
/**
* at_dma_off - disable DMA controller
* @atdma: the Atmel HDAMC device
static int __init at_dma_probe(struct platform_device *pdev)
{
- struct at_dma_platform_data *pdata;
struct resource *io;
struct at_dma *atdma;
size_t size;
int irq;
int err;
int i;
+ u32 nr_channels;
+ dma_cap_mask_t cap_mask = {};
+ enum atdma_devtype atdmatype;
+
+ dma_cap_set(DMA_MEMCPY, cap_mask);
- /* get DMA Controller parameters from platform */
- pdata = pdev->dev.platform_data;
- if (!pdata || pdata->nr_channels > AT_DMA_MAX_NR_CHANNELS)
+ /* get DMA parameters from controller type */
+ atdmatype = at_dma_get_driver_data(pdev);
+
+ switch (atdmatype) {
+ case ATDMA_DEVTYPE_SAM9RL:
+ nr_channels = 2;
+ break;
+ case ATDMA_DEVTYPE_SAM9G45:
+ nr_channels = 8;
+ dma_cap_set(DMA_SLAVE, cap_mask);
+ break;
+ default:
return -EINVAL;
+ }
io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!io)
return irq;
size = sizeof(struct at_dma);
- size += pdata->nr_channels * sizeof(struct at_dma_chan);
+ size += nr_channels * sizeof(struct at_dma_chan);
atdma = kzalloc(size, GFP_KERNEL);
if (!atdma)
return -ENOMEM;
- /* discover transaction capabilites from the platform data */
- atdma->dma_common.cap_mask = pdata->cap_mask;
- atdma->all_chan_mask = (1 << pdata->nr_channels) - 1;
+ /* discover transaction capabilities */
+ atdma->dma_common.cap_mask = cap_mask;
+ atdma->all_chan_mask = (1 << nr_channels) - 1;
+ atdma->devtype = atdmatype;
size = resource_size(io);
if (!request_mem_region(io->start, size, pdev->dev.driver->name)) {
/* initialize channels related values */
INIT_LIST_HEAD(&atdma->dma_common.channels);
- for (i = 0; i < pdata->nr_channels; i++, atdma->dma_common.chancnt++) {
+ for (i = 0; i < nr_channels; i++) {
struct at_dma_chan *atchan = &atdma->chan[i];
atchan->chan_common.device = &atdma->dma_common;
atchan->chan_common.cookie = atchan->completed_cookie = 1;
- atchan->chan_common.chan_id = i;
list_add_tail(&atchan->chan_common.device_node,
&atdma->dma_common.channels);
dev_info(&pdev->dev, "Atmel AHB DMA Controller ( %s%s), %d channels\n",
dma_has_cap(DMA_MEMCPY, atdma->dma_common.cap_mask) ? "cpy " : "",
dma_has_cap(DMA_SLAVE, atdma->dma_common.cap_mask) ? "slave " : "",
- atdma->dma_common.chancnt);
+ nr_channels);
dma_async_device_register(&atdma->dma_common);
static struct platform_driver at_dma_driver = {
.remove = __exit_p(at_dma_remove),
.shutdown = at_dma_shutdown,
+ .id_table = atdma_devtypes,
.driver = {
.name = "at_hdmac",
.pm = &at_dma_dev_pm_ops,
+ .of_match_table = of_match_ptr(atmel_dma_dt_ids),
},
};