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iommu/ipmmu-vmsa: Add device tree support 

Make platform data optional when the device is instantiated from DT and
look up the micro-TLB number in the bus master DT node.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
This commit is contained in:
Laurent Pinchart 2014-03-17 01:02:46 +01:00
parent 4a93f21d87
commit 275f5053c7
1 changed files with 47 additions and 8 deletions
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55
drivers/iommu/ipmmu-vmsa.c
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@ -16,6 +16,7 @@
#include <linux/io.h>
#include <linux/iommu.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_data/ipmmu-vmsa.h>
#include <linux/platform_device.h>
#include <linux/sizes.h>
@ -58,6 +59,8 @@ static LIST_HEAD(ipmmu_devices);
* Registers Definition
*/
#define IM_NS_ALIAS_OFFSET 0x800
#define IM_CTX_SIZE 0x40
#define IMCTR 0x0000
@ -1002,16 +1005,33 @@ static phys_addr_t ipmmu_iova_to_phys(struct iommu_domain *io_domain,
static int ipmmu_find_utlb(struct ipmmu_vmsa_device *mmu, struct device *dev)
{
const struct ipmmu_vmsa_master *master = mmu->pdata->masters;
const char *devname = dev_name(dev);
unsigned int i;
struct of_phandle_args args;
int ret;
for (i = 0; i < mmu->pdata->num_masters; ++i, ++master) {
if (strcmp(master->name, devname) == 0)
return master->utlb;
if (mmu->pdata) {
const struct ipmmu_vmsa_master *master = mmu->pdata->masters;
const char *devname = dev_name(dev);
unsigned int i;
for (i = 0; i < mmu->pdata->num_masters; ++i, ++master) {
if (strcmp(master->name, devname) == 0)
return master->utlb;
}
return -1;
}
return -1;
ret = of_parse_phandle_with_args(dev->of_node, "iommus",
"#iommu-cells", 0, &args);
if (ret < 0)
return -1;
of_node_put(args.np);
if (args.np != mmu->dev->of_node || args.args_count != 1)
return -1;
return args.args[0];
}
static int ipmmu_add_device(struct device *dev)
@ -1157,7 +1177,7 @@ static int ipmmu_probe(struct platform_device *pdev)
int irq;
int ret;
if (!pdev->dev.platform_data) {
if (!IS_ENABLED(CONFIG_OF) && !pdev->dev.platform_data) {
dev_err(&pdev->dev, "missing platform data\n");
return -EINVAL;
}
@ -1178,6 +1198,20 @@ static int ipmmu_probe(struct platform_device *pdev)
if (IS_ERR(mmu->base))
return PTR_ERR(mmu->base);
/*
* The IPMMU has two register banks, for secure and non-secure modes.
* The bank mapped at the beginning of the IPMMU address space
* corresponds to the running mode of the CPU. When running in secure
* mode the non-secure register bank is also available at an offset.
*
* Secure mode operation isn't clearly documented and is thus currently
* not implemented in the driver. Furthermore, preliminary tests of
* non-secure operation with the main register bank were not successful.
* Offset the registers base unconditionally to point to the non-secure
* alias space for now.
*/
mmu->base += IM_NS_ALIAS_OFFSET;
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "no IRQ found\n");
@ -1223,9 +1257,14 @@ static int ipmmu_remove(struct platform_device *pdev)
return 0;
}
static const struct of_device_id ipmmu_of_ids[] = {
{ .compatible = "renesas,ipmmu-vmsa", },
};
static struct platform_driver ipmmu_driver = {
.driver = {
.name = "ipmmu-vmsa",
.of_match_table = of_match_ptr(ipmmu_of_ids),
},
.probe = ipmmu_probe,
.remove = ipmmu_remove,