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iommu/rockchip: Use OF_IOMMU to attach devices automatically 

Converts the rockchip-iommu driver to use the OF_IOMMU infrastructure,
which allows attaching master devices to their IOMMUs automatically
according to DT properties.

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jeffy Chen 2018-03-23 15:38:11 +08:00 committed by Joerg Roedel
parent 9176a303d9
commit 5fd577c3ea
1 changed files with 41 additions and 96 deletions
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137
drivers/iommu/rockchip-iommu.c
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@ -19,6 +19,7 @@
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_iommu.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
@ -104,6 +105,10 @@ struct rk_iommu {
struct iommu_domain *domain; /* domain to which iommu is attached */
};
struct rk_iommudata {
struct rk_iommu *iommu;
};
static struct device *dma_dev;
static inline void rk_table_flush(struct rk_iommu_domain *dom, dma_addr_t dma,
@ -807,18 +812,9 @@ static size_t rk_iommu_unmap(struct iommu_domain *domain, unsigned long _iova,
static struct rk_iommu *rk_iommu_from_dev(struct device *dev)
{
struct iommu_group *group;
struct device *iommu_dev;
struct rk_iommu *rk_iommu;
struct rk_iommudata *data = dev->archdata.iommu;
group = iommu_group_get(dev);
if (!group)
return NULL;
iommu_dev = iommu_group_get_iommudata(group);
rk_iommu = dev_get_drvdata(iommu_dev);
iommu_group_put(group);
return rk_iommu;
return data ? data->iommu : NULL;
}
static int rk_iommu_attach_device(struct iommu_domain *domain,
@ -989,112 +985,55 @@ static void rk_iommu_domain_free(struct iommu_domain *domain)
iommu_put_dma_cookie(&rk_domain->domain);
}
static bool rk_iommu_is_dev_iommu_master(struct device *dev)
{
struct device_node *np = dev->of_node;
int ret;
/*
* An iommu master has an iommus property containing a list of phandles
* to iommu nodes, each with an #iommu-cells property with value 0.
*/
ret = of_count_phandle_with_args(np, "iommus", "#iommu-cells");
return (ret > 0);
}
static int rk_iommu_group_set_iommudata(struct iommu_group *group,
struct device *dev)
{
struct device_node *np = dev->of_node;
struct platform_device *pd;
int ret;
struct of_phandle_args args;
/*
* An iommu master has an iommus property containing a list of phandles
* to iommu nodes, each with an #iommu-cells property with value 0.
*/
ret = of_parse_phandle_with_args(np, "iommus", "#iommu-cells", 0,
&args);
if (ret) {
dev_err(dev, "of_parse_phandle_with_args(%pOF) => %d\n",
np, ret);
return ret;
}
if (args.args_count != 0) {
dev_err(dev, "incorrect number of iommu params found for %pOF (found %d, expected 0)\n",
args.np, args.args_count);
return -EINVAL;
}
pd = of_find_device_by_node(args.np);
of_node_put(args.np);
if (!pd) {
dev_err(dev, "iommu %pOF not found\n", args.np);
return -EPROBE_DEFER;
}
/* TODO(djkurtz): handle multiple slave iommus for a single master */
iommu_group_set_iommudata(group, &pd->dev, NULL);
return 0;
}
static int rk_iommu_add_device(struct device *dev)
{
struct iommu_group *group;
struct rk_iommu *iommu;
int ret;
if (!rk_iommu_is_dev_iommu_master(dev))
return -ENODEV;
group = iommu_group_get(dev);
if (!group) {
group = iommu_group_alloc();
if (IS_ERR(group)) {
dev_err(dev, "Failed to allocate IOMMU group\n");
return PTR_ERR(group);
}
}
ret = iommu_group_add_device(group, dev);
if (ret)
goto err_put_group;
ret = rk_iommu_group_set_iommudata(group, dev);
if (ret)
goto err_remove_device;
iommu = rk_iommu_from_dev(dev);
if (iommu)
iommu_device_link(&iommu->iommu, dev);
if (!iommu)
return -ENODEV;
group = iommu_group_get_for_dev(dev);
if (IS_ERR(group))
return PTR_ERR(group);
iommu_group_put(group);
iommu_device_link(&iommu->iommu, dev);
return 0;
err_remove_device:
iommu_group_remove_device(dev);
err_put_group:
iommu_group_put(group);
return ret;
}
static void rk_iommu_remove_device(struct device *dev)
{
struct rk_iommu *iommu;
if (!rk_iommu_is_dev_iommu_master(dev))
return;
iommu = rk_iommu_from_dev(dev);
if (iommu)
iommu_device_unlink(&iommu->iommu, dev);
iommu_device_unlink(&iommu->iommu, dev);
iommu_group_remove_device(dev);
}
static int rk_iommu_of_xlate(struct device *dev,
struct of_phandle_args *args)
{
struct platform_device *iommu_dev;
struct rk_iommudata *data;
data = devm_kzalloc(dma_dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
iommu_dev = of_find_device_by_node(args->np);
data->iommu = platform_get_drvdata(iommu_dev);
dev->archdata.iommu = data;
of_dev_put(iommu_dev);
return 0;
}
static const struct iommu_ops rk_iommu_ops = {
.domain_alloc = rk_iommu_domain_alloc,
.domain_free = rk_iommu_domain_free,
@ -1106,7 +1045,9 @@ static const struct iommu_ops rk_iommu_ops = {
.add_device = rk_iommu_add_device,
.remove_device = rk_iommu_remove_device,
.iova_to_phys = rk_iommu_iova_to_phys,
.device_group = generic_device_group,
.pgsize_bitmap = RK_IOMMU_PGSIZE_BITMAP,
.of_xlate = rk_iommu_of_xlate,
};
static int rk_iommu_probe(struct platform_device *pdev)
@ -1178,6 +1119,8 @@ static int rk_iommu_probe(struct platform_device *pdev)
goto err_unprepare_clocks;
iommu_device_set_ops(&iommu->iommu, &rk_iommu_ops);
iommu_device_set_fwnode(&iommu->iommu, &dev->of_node->fwnode);
err = iommu_device_register(&iommu->iommu);
if (err)
goto err_remove_sysfs;
@ -1250,6 +1193,8 @@ static int __init rk_iommu_init(void)
}
subsys_initcall(rk_iommu_init);
IOMMU_OF_DECLARE(rk_iommu_of, "rockchip,iommu");
MODULE_DESCRIPTION("IOMMU API for Rockchip");
MODULE_AUTHOR("Simon Xue <xxm@rock-chips.com> and Daniel Kurtz <djkurtz@chromium.org>");
MODULE_ALIAS("platform:rockchip-iommu");