a074ae38f8
The DRA7x has more peripherals with DMA requests than the sDMA can handle: 205 vs 127. All DMA requests are routed through the DMA crossbar, which can be configured to route selected incoming DMA requests to specific sDMA request. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
188 lines
4.7 KiB
C
188 lines
4.7 KiB
C
/*
|
|
* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com
|
|
* Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
|
|
*
|
|
* 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.
|
|
*
|
|
*/
|
|
#include <linux/slab.h>
|
|
#include <linux/err.h>
|
|
#include <linux/init.h>
|
|
#include <linux/list.h>
|
|
#include <linux/io.h>
|
|
#include <linux/idr.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/of_dma.h>
|
|
|
|
#define TI_XBAR_OUTPUTS 127
|
|
#define TI_XBAR_INPUTS 256
|
|
|
|
static DEFINE_IDR(map_idr);
|
|
|
|
struct ti_dma_xbar_data {
|
|
void __iomem *iomem;
|
|
|
|
struct dma_router dmarouter;
|
|
|
|
u16 safe_val; /* Value to rest the crossbar lines */
|
|
u32 xbar_requests; /* number of DMA requests connected to XBAR */
|
|
u32 dma_requests; /* number of DMA requests forwarded to DMA */
|
|
};
|
|
|
|
struct ti_dma_xbar_map {
|
|
u16 xbar_in;
|
|
int xbar_out;
|
|
};
|
|
|
|
static inline void ti_dma_xbar_write(void __iomem *iomem, int xbar, u16 val)
|
|
{
|
|
writew_relaxed(val, iomem + (xbar * 2));
|
|
}
|
|
|
|
static void ti_dma_xbar_free(struct device *dev, void *route_data)
|
|
{
|
|
struct ti_dma_xbar_data *xbar = dev_get_drvdata(dev);
|
|
struct ti_dma_xbar_map *map = route_data;
|
|
|
|
dev_dbg(dev, "Unmapping XBAR%u (was routed to %d)\n",
|
|
map->xbar_in, map->xbar_out);
|
|
|
|
ti_dma_xbar_write(xbar->iomem, map->xbar_out, xbar->safe_val);
|
|
idr_remove(&map_idr, map->xbar_out);
|
|
kfree(map);
|
|
}
|
|
|
|
static void *ti_dma_xbar_route_allocate(struct of_phandle_args *dma_spec,
|
|
struct of_dma *ofdma)
|
|
{
|
|
struct platform_device *pdev = of_find_device_by_node(ofdma->of_node);
|
|
struct ti_dma_xbar_data *xbar = platform_get_drvdata(pdev);
|
|
struct ti_dma_xbar_map *map;
|
|
|
|
if (dma_spec->args[0] >= xbar->xbar_requests) {
|
|
dev_err(&pdev->dev, "Invalid XBAR request number: %d\n",
|
|
dma_spec->args[0]);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
/* The of_node_put() will be done in the core for the node */
|
|
dma_spec->np = of_parse_phandle(ofdma->of_node, "dma-masters", 0);
|
|
if (!dma_spec->np) {
|
|
dev_err(&pdev->dev, "Can't get DMA master\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
map = kzalloc(sizeof(*map), GFP_KERNEL);
|
|
if (!map) {
|
|
of_node_put(dma_spec->np);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
map->xbar_out = idr_alloc(&map_idr, NULL, 0, xbar->dma_requests,
|
|
GFP_KERNEL);
|
|
map->xbar_in = (u16)dma_spec->args[0];
|
|
|
|
/* The DMA request is 1 based in sDMA */
|
|
dma_spec->args[0] = map->xbar_out + 1;
|
|
|
|
dev_dbg(&pdev->dev, "Mapping XBAR%u to DMA%d\n",
|
|
map->xbar_in, map->xbar_out);
|
|
|
|
ti_dma_xbar_write(xbar->iomem, map->xbar_out, map->xbar_in);
|
|
|
|
return map;
|
|
}
|
|
|
|
static int ti_dma_xbar_probe(struct platform_device *pdev)
|
|
{
|
|
struct device_node *node = pdev->dev.of_node;
|
|
struct device_node *dma_node;
|
|
struct ti_dma_xbar_data *xbar;
|
|
struct resource *res;
|
|
u32 safe_val;
|
|
void __iomem *iomem;
|
|
int i, ret;
|
|
|
|
if (!node)
|
|
return -ENODEV;
|
|
|
|
xbar = devm_kzalloc(&pdev->dev, sizeof(*xbar), GFP_KERNEL);
|
|
if (!xbar)
|
|
return -ENOMEM;
|
|
|
|
dma_node = of_parse_phandle(node, "dma-masters", 0);
|
|
if (!dma_node) {
|
|
dev_err(&pdev->dev, "Can't get DMA master node\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (of_property_read_u32(dma_node, "dma-requests",
|
|
&xbar->dma_requests)) {
|
|
dev_info(&pdev->dev,
|
|
"Missing XBAR output information, using %u.\n",
|
|
TI_XBAR_OUTPUTS);
|
|
xbar->dma_requests = TI_XBAR_OUTPUTS;
|
|
}
|
|
of_node_put(dma_node);
|
|
|
|
if (of_property_read_u32(node, "dma-requests", &xbar->xbar_requests)) {
|
|
dev_info(&pdev->dev,
|
|
"Missing XBAR input information, using %u.\n",
|
|
TI_XBAR_INPUTS);
|
|
xbar->xbar_requests = TI_XBAR_INPUTS;
|
|
}
|
|
|
|
if (!of_property_read_u32(node, "ti,dma-safe-map", &safe_val))
|
|
xbar->safe_val = (u16)safe_val;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res)
|
|
return -ENODEV;
|
|
|
|
iomem = devm_ioremap_resource(&pdev->dev, res);
|
|
if (!iomem)
|
|
return -ENOMEM;
|
|
|
|
xbar->iomem = iomem;
|
|
|
|
xbar->dmarouter.dev = &pdev->dev;
|
|
xbar->dmarouter.route_free = ti_dma_xbar_free;
|
|
|
|
platform_set_drvdata(pdev, xbar);
|
|
|
|
/* Reset the crossbar */
|
|
for (i = 0; i < xbar->dma_requests; i++)
|
|
ti_dma_xbar_write(xbar->iomem, i, xbar->safe_val);
|
|
|
|
ret = of_dma_router_register(node, ti_dma_xbar_route_allocate,
|
|
&xbar->dmarouter);
|
|
if (ret) {
|
|
/* Restore the defaults for the crossbar */
|
|
for (i = 0; i < xbar->dma_requests; i++)
|
|
ti_dma_xbar_write(xbar->iomem, i, i);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct of_device_id ti_dma_xbar_match[] = {
|
|
{ .compatible = "ti,dra7-dma-crossbar" },
|
|
{},
|
|
};
|
|
|
|
static struct platform_driver ti_dma_xbar_driver = {
|
|
.driver = {
|
|
.name = "ti-dma-crossbar",
|
|
.of_match_table = of_match_ptr(ti_dma_xbar_match),
|
|
},
|
|
.probe = ti_dma_xbar_probe,
|
|
};
|
|
|
|
int omap_dmaxbar_init(void)
|
|
{
|
|
return platform_driver_register(&ti_dma_xbar_driver);
|
|
}
|
|
arch_initcall(omap_dmaxbar_init);
|