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// SPDX-License-Identifier: GPL-2.0+
//
// Copyright (c) 2013-2014 Freescale Semiconductor, Inc
// Copyright (c) 2017 Sysam, Angelo Dureghello <angelo@sysam.it>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/dmaengine.h>
#include <linux/platform_device.h>
#include <linux/platform_data/dma-mcf-edma.h>
#include "fsl-edma-common.h"
#define EDMA_CHANNELS 64
#define EDMA_MASK_CH(x) ((x) & GENMASK(5, 0))
static irqreturn_t mcf_edma_tx_handler(int irq, void *dev_id)
{
struct fsl_edma_engine *mcf_edma = dev_id;
struct edma_regs *regs = &mcf_edma->regs;
unsigned int ch;
u64 intmap;
intmap = ioread32(regs->inth);
intmap <<= 32;
intmap |= ioread32(regs->intl);
if (!intmap)
return IRQ_NONE;
for (ch = 0; ch < mcf_edma->n_chans; ch++) {
if (intmap & BIT(ch)) {
iowrite8(EDMA_MASK_CH(ch), regs->cint);
fsl_edma_tx_chan_handler(&mcf_edma->chans[ch]);
}
}
return IRQ_HANDLED;
}
static irqreturn_t mcf_edma_err_handler(int irq, void *dev_id)
{
struct fsl_edma_engine *mcf_edma = dev_id;
struct edma_regs *regs = &mcf_edma->regs;
unsigned int err, ch;
err = ioread32(regs->errl);
if (!err)
return IRQ_NONE;
for (ch = 0; ch < (EDMA_CHANNELS / 2); ch++) {
if (err & BIT(ch)) {
fsl_edma_disable_request(&mcf_edma->chans[ch]);
iowrite8(EDMA_CERR_CERR(ch), regs->cerr);
fsl_edma_err_chan_handler(&mcf_edma->chans[ch]);
}
}
err = ioread32(regs->errh);
if (!err)
return IRQ_NONE;
for (ch = (EDMA_CHANNELS / 2); ch < EDMA_CHANNELS; ch++) {
if (err & (BIT(ch - (EDMA_CHANNELS / 2)))) {
fsl_edma_disable_request(&mcf_edma->chans[ch]);
iowrite8(EDMA_CERR_CERR(ch), regs->cerr);
mcf_edma->chans[ch].status = DMA_ERROR;
mcf_edma->chans[ch].idle = true;
}
}
return IRQ_HANDLED;
}
static int mcf_edma_irq_init(struct platform_device *pdev,
struct fsl_edma_engine *mcf_edma)
{
int ret = 0, i;
struct resource *res;
res = platform_get_resource_byname(pdev,
IORESOURCE_IRQ, "edma-tx-00-15");
if (!res)
return -1;
for (ret = 0, i = res->start; i <= res->end; ++i)
ret |= request_irq(i, mcf_edma_tx_handler, 0, "eDMA", mcf_edma);
if (ret)
return ret;
res = platform_get_resource_byname(pdev,
IORESOURCE_IRQ, "edma-tx-16-55");
if (!res)
return -1;
for (ret = 0, i = res->start; i <= res->end; ++i)
ret |= request_irq(i, mcf_edma_tx_handler, 0, "eDMA", mcf_edma);
if (ret)
return ret;
ret = platform_get_irq_byname(pdev, "edma-tx-56-63");
if (ret != -ENXIO) {
ret = request_irq(ret, mcf_edma_tx_handler,
0, "eDMA", mcf_edma);
if (ret)
return ret;
}
ret = platform_get_irq_byname(pdev, "edma-err");
if (ret != -ENXIO) {
ret = request_irq(ret, mcf_edma_err_handler,
0, "eDMA", mcf_edma);
if (ret)
return ret;
}
return 0;
}
static void mcf_edma_irq_free(struct platform_device *pdev,
struct fsl_edma_engine *mcf_edma)
{
int irq;
struct resource *res;
res = platform_get_resource_byname(pdev,
IORESOURCE_IRQ, "edma-tx-00-15");
if (res) {
for (irq = res->start; irq <= res->end; irq++)
free_irq(irq, mcf_edma);
}
res = platform_get_resource_byname(pdev,
IORESOURCE_IRQ, "edma-tx-16-55");
if (res) {
for (irq = res->start; irq <= res->end; irq++)
free_irq(irq, mcf_edma);
}
irq = platform_get_irq_byname(pdev, "edma-tx-56-63");
if (irq != -ENXIO)
free_irq(irq, mcf_edma);
irq = platform_get_irq_byname(pdev, "edma-err");
if (irq != -ENXIO)
free_irq(irq, mcf_edma);
}
static struct fsl_edma_drvdata mcf_data = {
.flags = FSL_EDMA_DRV_EDMA64,
.setup_irq = mcf_edma_irq_init,
};
static int mcf_edma_probe(struct platform_device *pdev)
{
struct mcf_edma_platform_data *pdata;
struct fsl_edma_engine *mcf_edma;
struct edma_regs *regs;
int ret, i, chans;
pdata = dev_get_platdata(&pdev->dev);
if (!pdata) {
dev_err(&pdev->dev, "no platform data supplied\n");
return -EINVAL;
}
if (!pdata->dma_channels) {
dev_info(&pdev->dev, "setting default channel number to 64");
chans = 64;
} else {
chans = pdata->dma_channels;
}
mcf_edma = devm_kzalloc(&pdev->dev, struct_size(mcf_edma, chans, chans),
GFP_KERNEL);
if (!mcf_edma)
return -ENOMEM;
mcf_edma->n_chans = chans;
/* Set up drvdata for ColdFire edma */
mcf_edma->drvdata = &mcf_data;
mcf_edma->big_endian = 1;
mutex_init(&mcf_edma->fsl_edma_mutex);
mcf_edma->membase = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(mcf_edma->membase))
return PTR_ERR(mcf_edma->membase);
fsl_edma_setup_regs(mcf_edma);
regs = &mcf_edma->regs;
INIT_LIST_HEAD(&mcf_edma->dma_dev.channels);
for (i = 0; i < mcf_edma->n_chans; i++) {
struct fsl_edma_chan *mcf_chan = &mcf_edma->chans[i];
mcf_chan->edma = mcf_edma;
mcf_chan->slave_id = i;
mcf_chan->idle = true;
mcf_chan->dma_dir = DMA_NONE;
mcf_chan->vchan.desc_free = fsl_edma_free_desc;
vchan_init(&mcf_chan->vchan, &mcf_edma->dma_dev);
mcf_chan->tcd = mcf_edma->membase + EDMA_TCD
+ i * sizeof(struct fsl_edma_hw_tcd);
iowrite32(0x0, &mcf_chan->tcd->csr);
}
iowrite32(~0, regs->inth);
iowrite32(~0, regs->intl);
ret = mcf_edma->drvdata->setup_irq(pdev, mcf_edma);
if (ret)
return ret;
dma_cap_set(DMA_PRIVATE, mcf_edma->dma_dev.cap_mask);
dma_cap_set(DMA_SLAVE, mcf_edma->dma_dev.cap_mask);
dma_cap_set(DMA_CYCLIC, mcf_edma->dma_dev.cap_mask);
mcf_edma->dma_dev.dev = &pdev->dev;
mcf_edma->dma_dev.device_alloc_chan_resources =
fsl_edma_alloc_chan_resources;
mcf_edma->dma_dev.device_free_chan_resources =
fsl_edma_free_chan_resources;
mcf_edma->dma_dev.device_config = fsl_edma_slave_config;
mcf_edma->dma_dev.device_prep_dma_cyclic =
fsl_edma_prep_dma_cyclic;
mcf_edma->dma_dev.device_prep_slave_sg = fsl_edma_prep_slave_sg;
mcf_edma->dma_dev.device_tx_status = fsl_edma_tx_status;
mcf_edma->dma_dev.device_pause = fsl_edma_pause;
mcf_edma->dma_dev.device_resume = fsl_edma_resume;
mcf_edma->dma_dev.device_terminate_all = fsl_edma_terminate_all;
mcf_edma->dma_dev.device_issue_pending = fsl_edma_issue_pending;
mcf_edma->dma_dev.src_addr_widths = FSL_EDMA_BUSWIDTHS;
mcf_edma->dma_dev.dst_addr_widths = FSL_EDMA_BUSWIDTHS;
mcf_edma->dma_dev.directions =
BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
mcf_edma->dma_dev.filter.fn = mcf_edma_filter_fn;
mcf_edma->dma_dev.filter.map = pdata->slave_map;
mcf_edma->dma_dev.filter.mapcnt = pdata->slavecnt;
platform_set_drvdata(pdev, mcf_edma);
ret = dma_async_device_register(&mcf_edma->dma_dev);
if (ret) {
dev_err(&pdev->dev,
"Can't register Freescale eDMA engine. (%d)\n", ret);
return ret;
}
/* Enable round robin arbitration */
iowrite32(EDMA_CR_ERGA | EDMA_CR_ERCA, regs->cr);
return 0;
}
static int mcf_edma_remove(struct platform_device *pdev)
{
struct fsl_edma_engine *mcf_edma = platform_get_drvdata(pdev);
mcf_edma_irq_free(pdev, mcf_edma);
fsl_edma_cleanup_vchan(&mcf_edma->dma_dev);
dma_async_device_unregister(&mcf_edma->dma_dev);
return 0;
}
static struct platform_driver mcf_edma_driver = {
.driver = {
.name = "mcf-edma",
},
.probe = mcf_edma_probe,
.remove = mcf_edma_remove,
};
bool mcf_edma_filter_fn(struct dma_chan *chan, void *param)
{
if (chan->device->dev->driver == &mcf_edma_driver.driver) {
struct fsl_edma_chan *mcf_chan = to_fsl_edma_chan(chan);
return (mcf_chan->slave_id == (uintptr_t)param);
}
return false;
}
EXPORT_SYMBOL(mcf_edma_filter_fn);
static int __init mcf_edma_init(void)
{
return platform_driver_register(&mcf_edma_driver);
}
subsys_initcall(mcf_edma_init);
static void __exit mcf_edma_exit(void)
{
platform_driver_unregister(&mcf_edma_driver);
}
module_exit(mcf_edma_exit);
MODULE_ALIAS("platform:mcf-edma");
MODULE_DESCRIPTION("Freescale eDMA engine driver, ColdFire family");
MODULE_LICENSE("GPL v2");
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