ti-dma-crossbar.c
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/*
* 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/of_address.h>
#include <linux/of_device.h>
#include <linux/of_dma.h>
#define TI_XBAR_DRA7 0
#define TI_XBAR_AM335X 1
static const u32 ti_xbar_type[] = {
[TI_XBAR_DRA7] = TI_XBAR_DRA7,
[TI_XBAR_AM335X] = TI_XBAR_AM335X,
};
static const struct of_device_id ti_dma_xbar_match[] = {
{
.compatible = "ti,dra7-dma-crossbar",
.data = &ti_xbar_type[TI_XBAR_DRA7],
},
{
.compatible = "ti,am335x-edma-crossbar",
.data = &ti_xbar_type[TI_XBAR_AM335X],
},
{},
};
/* Crossbar on AM335x/AM437x family */
#define TI_AM335X_XBAR_LINES 64
struct ti_am335x_xbar_data {
void __iomem *iomem;
struct dma_router dmarouter;
u32 xbar_events; /* maximum number of events to select in xbar */
u32 dma_requests; /* number of DMA requests on eDMA */
};
struct ti_am335x_xbar_map {
u16 dma_line;
u16 mux_val;
};
static inline void ti_am335x_xbar_write(void __iomem *iomem, int event, u16 val)
{
writeb_relaxed(val & 0x1f, iomem + event);
}
static void ti_am335x_xbar_free(struct device *dev, void *route_data)
{
struct ti_am335x_xbar_data *xbar = dev_get_drvdata(dev);
struct ti_am335x_xbar_map *map = route_data;
dev_dbg(dev, "Unmapping XBAR event %u on channel %u\n",
map->mux_val, map->dma_line);
ti_am335x_xbar_write(xbar->iomem, map->dma_line, 0);
kfree(map);
}
static void *ti_am335x_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_am335x_xbar_data *xbar = platform_get_drvdata(pdev);
struct ti_am335x_xbar_map *map;
if (dma_spec->args_count != 3)
return ERR_PTR(-EINVAL);
if (dma_spec->args[2] >= xbar->xbar_events) {
dev_err(&pdev->dev, "Invalid XBAR event number: %d\n",
dma_spec->args[2]);
return ERR_PTR(-EINVAL);
}
if (dma_spec->args[0] >= xbar->dma_requests) {
dev_err(&pdev->dev, "Invalid DMA request line 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->dma_line = (u16)dma_spec->args[0];
map->mux_val = (u16)dma_spec->args[2];
dma_spec->args[2] = 0;
dma_spec->args_count = 2;
dev_dbg(&pdev->dev, "Mapping XBAR event%u to DMA%u\n",
map->mux_val, map->dma_line);
ti_am335x_xbar_write(xbar->iomem, map->dma_line, map->mux_val);
return map;
}
static const struct of_device_id ti_am335x_master_match[] = {
{ .compatible = "ti,edma3-tpcc", },
{},
};
static int ti_am335x_xbar_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
const struct of_device_id *match;
struct device_node *dma_node;
struct ti_am335x_xbar_data *xbar;
struct resource *res;
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;
}
match = of_match_node(ti_am335x_master_match, dma_node);
if (!match) {
dev_err(&pdev->dev, "DMA master is not supported\n");
return -EINVAL;
}
if (of_property_read_u32(dma_node, "dma-requests",
&xbar->dma_requests)) {
dev_info(&pdev->dev,
"Missing XBAR output information, using %u.\n",
TI_AM335X_XBAR_LINES);
xbar->dma_requests = TI_AM335X_XBAR_LINES;
}
of_node_put(dma_node);
if (of_property_read_u32(node, "dma-requests", &xbar->xbar_events)) {
dev_info(&pdev->dev,
"Missing XBAR input information, using %u.\n",
TI_AM335X_XBAR_LINES);
xbar->xbar_events = TI_AM335X_XBAR_LINES;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
iomem = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(iomem))
return PTR_ERR(iomem);
xbar->iomem = iomem;
xbar->dmarouter.dev = &pdev->dev;
xbar->dmarouter.route_free = ti_am335x_xbar_free;
platform_set_drvdata(pdev, xbar);
/* Reset the crossbar */
for (i = 0; i < xbar->dma_requests; i++)
ti_am335x_xbar_write(xbar->iomem, i, 0);
ret = of_dma_router_register(node, ti_am335x_xbar_route_allocate,
&xbar->dmarouter);
return ret;
}
/* Crossbar on DRA7xx family */
#define TI_DRA7_XBAR_OUTPUTS 127
#define TI_DRA7_XBAR_INPUTS 256
struct ti_dra7_xbar_data {
void __iomem *iomem;
struct dma_router dmarouter;
struct mutex mutex;
unsigned long *dma_inuse;
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 */
u32 dma_offset;
};
struct ti_dra7_xbar_map {
u16 xbar_in;
int xbar_out;
};
static inline void ti_dra7_xbar_write(void __iomem *iomem, int xbar, u16 val)
{
writew_relaxed(val, iomem + (xbar * 2));
}
static void ti_dra7_xbar_free(struct device *dev, void *route_data)
{
struct ti_dra7_xbar_data *xbar = dev_get_drvdata(dev);
struct ti_dra7_xbar_map *map = route_data;
dev_dbg(dev, "Unmapping XBAR%u (was routed to %d)\n",
map->xbar_in, map->xbar_out);
ti_dra7_xbar_write(xbar->iomem, map->xbar_out, xbar->safe_val);
mutex_lock(&xbar->mutex);
clear_bit(map->xbar_out, xbar->dma_inuse);
mutex_unlock(&xbar->mutex);
kfree(map);
}
static void *ti_dra7_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_dra7_xbar_data *xbar = platform_get_drvdata(pdev);
struct ti_dra7_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);
}
mutex_lock(&xbar->mutex);
map->xbar_out = find_first_zero_bit(xbar->dma_inuse,
xbar->dma_requests);
mutex_unlock(&xbar->mutex);
if (map->xbar_out == xbar->dma_requests) {
dev_err(&pdev->dev, "Run out of free DMA requests\n");
kfree(map);
return ERR_PTR(-ENOMEM);
}
set_bit(map->xbar_out, xbar->dma_inuse);
map->xbar_in = (u16)dma_spec->args[0];
dma_spec->args[0] = map->xbar_out + xbar->dma_offset;
dev_dbg(&pdev->dev, "Mapping XBAR%u to DMA%d\n",
map->xbar_in, map->xbar_out);
ti_dra7_xbar_write(xbar->iomem, map->xbar_out, map->xbar_in);
return map;
}
#define TI_XBAR_EDMA_OFFSET 0
#define TI_XBAR_SDMA_OFFSET 1
static const u32 ti_dma_offset[] = {
[TI_XBAR_EDMA_OFFSET] = 0,
[TI_XBAR_SDMA_OFFSET] = 1,
};
static const struct of_device_id ti_dra7_master_match[] = {
{
.compatible = "ti,omap4430-sdma",
.data = &ti_dma_offset[TI_XBAR_SDMA_OFFSET],
},
{
.compatible = "ti,edma3",
.data = &ti_dma_offset[TI_XBAR_EDMA_OFFSET],
},
{
.compatible = "ti,edma3-tpcc",
.data = &ti_dma_offset[TI_XBAR_EDMA_OFFSET],
},
{},
};
static inline void ti_dra7_xbar_reserve(int offset, int len, unsigned long *p)
{
for (; len > 0; len--)
clear_bit(offset + (len - 1), p);
}
static int ti_dra7_xbar_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
const struct of_device_id *match;
struct device_node *dma_node;
struct ti_dra7_xbar_data *xbar;
struct property *prop;
struct resource *res;
u32 safe_val;
int sz;
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;
}
match = of_match_node(ti_dra7_master_match, dma_node);
if (!match) {
dev_err(&pdev->dev, "DMA master is not supported\n");
return -EINVAL;
}
if (of_property_read_u32(dma_node, "dma-requests",
&xbar->dma_requests)) {
dev_info(&pdev->dev,
"Missing XBAR output information, using %u.\n",
TI_DRA7_XBAR_OUTPUTS);
xbar->dma_requests = TI_DRA7_XBAR_OUTPUTS;
}
of_node_put(dma_node);
xbar->dma_inuse = devm_kcalloc(&pdev->dev,
BITS_TO_LONGS(xbar->dma_requests),
sizeof(unsigned long), GFP_KERNEL);
if (!xbar->dma_inuse)
return -ENOMEM;
if (of_property_read_u32(node, "dma-requests", &xbar->xbar_requests)) {
dev_info(&pdev->dev,
"Missing XBAR input information, using %u.\n",
TI_DRA7_XBAR_INPUTS);
xbar->xbar_requests = TI_DRA7_XBAR_INPUTS;
}
if (!of_property_read_u32(node, "ti,dma-safe-map", &safe_val))
xbar->safe_val = (u16)safe_val;
prop = of_find_property(node, "ti,reserved-dma-request-ranges", &sz);
if (prop) {
const char pname[] = "ti,reserved-dma-request-ranges";
u32 (*rsv_events)[2];
size_t nelm = sz / sizeof(*rsv_events);
int i;
if (!nelm)
return -EINVAL;
rsv_events = kcalloc(nelm, sizeof(*rsv_events), GFP_KERNEL);
if (!rsv_events)
return -ENOMEM;
ret = of_property_read_u32_array(node, pname, (u32 *)rsv_events,
nelm * 2);
if (ret)
return ret;
for (i = 0; i < nelm; i++) {
ti_dra7_xbar_reserve(rsv_events[i][0], rsv_events[i][1],
xbar->dma_inuse);
}
kfree(rsv_events);
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
iomem = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(iomem))
return PTR_ERR(iomem);
xbar->iomem = iomem;
xbar->dmarouter.dev = &pdev->dev;
xbar->dmarouter.route_free = ti_dra7_xbar_free;
xbar->dma_offset = *(u32 *)match->data;
mutex_init(&xbar->mutex);
platform_set_drvdata(pdev, xbar);
/* Reset the crossbar */
for (i = 0; i < xbar->dma_requests; i++) {
if (!test_bit(i, xbar->dma_inuse))
ti_dra7_xbar_write(xbar->iomem, i, xbar->safe_val);
}
ret = of_dma_router_register(node, ti_dra7_xbar_route_allocate,
&xbar->dmarouter);
if (ret) {
/* Restore the defaults for the crossbar */
for (i = 0; i < xbar->dma_requests; i++) {
if (!test_bit(i, xbar->dma_inuse))
ti_dra7_xbar_write(xbar->iomem, i, i);
}
}
return ret;
}
static int ti_dma_xbar_probe(struct platform_device *pdev)
{
const struct of_device_id *match;
int ret;
match = of_match_node(ti_dma_xbar_match, pdev->dev.of_node);
if (unlikely(!match))
return -EINVAL;
switch (*(u32 *)match->data) {
case TI_XBAR_DRA7:
ret = ti_dra7_xbar_probe(pdev);
break;
case TI_XBAR_AM335X:
ret = ti_am335x_xbar_probe(pdev);
break;
default:
dev_err(&pdev->dev, "Unsupported crossbar\n");
ret = -ENODEV;
break;
}
return ret;
}
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,
};
static int omap_dmaxbar_init(void)
{
return platform_driver_register(&ti_dma_xbar_driver);
}
arch_initcall(omap_dmaxbar_init);