diff options
| author | Suman Anna <s-anna@ti.com> | 2015-01-09 15:21:58 -0600 |
|---|---|---|
| committer | Ohad Ben-Cohen <ohad@wizery.com> | 2015-03-12 10:43:26 +0200 |
| commit | 315491e5d6ee66838a18a8ca0c14e6ffb376e48c (patch) | |
| tree | 308f7c9d3cef5ff6d0cd2508714fe7406dd9718c /drivers/remoteproc | |
| parent | c517d838eb7d07bbe9507871fab3931deccff539 (diff) | |
| download | linux-315491e5d6ee66838a18a8ca0c14e6ffb376e48c.tar.bz2 | |
remoteproc: add IOMMU hardware capability flag
The remoteproc framework currently relies on iommu_present() on
the bus the device is on, to perform MMU management. However, this
logic doesn't scale for multi-arch, especially for processors that
do not have an IOMMU. Replace this logic instead by using a h/w
capability flag for the presence of IOMMU in the rproc structure.
This issue is seen on OMAP platforms when trying to add a remoteproc
driver for a small Cortex M3 called the WkupM3 used for suspend /
resume management on TI AM335/AM437x SoCs. This processor does not
have an MMU. Same is the case with another processor subsystem
PRU-ICSS on AM335/AM437x. All these are platform devices, and the
current iommu_present check will not scale for the same kernel image
to support OMAP4/OMAP5 and AM335/AM437x.
The existing platform implementation drivers - OMAP remoteproc, STE
Modem remoteproc and DA8xx remoteproc, are updated as well to properly
configure the newly added rproc field.
Cc: Robert Tivy <rtivy@ti.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Suman Anna <s-anna@ti.com>
[small change in the commit title and in a single comment]
Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Diffstat (limited to 'drivers/remoteproc')
| -rw-r--r-- | drivers/remoteproc/da8xx_remoteproc.c | 1 | ||||
| -rw-r--r-- | drivers/remoteproc/omap_remoteproc.c | 2 | ||||
| -rw-r--r-- | drivers/remoteproc/remoteproc_core.c | 15 | ||||
| -rw-r--r-- | drivers/remoteproc/ste_modem_rproc.c | 1 |
4 files changed, 6 insertions, 13 deletions
diff --git a/drivers/remoteproc/da8xx_remoteproc.c b/drivers/remoteproc/da8xx_remoteproc.c index 89fd057e5f1d..f8d6a0661c14 100644 --- a/drivers/remoteproc/da8xx_remoteproc.c +++ b/drivers/remoteproc/da8xx_remoteproc.c @@ -224,6 +224,7 @@ static int da8xx_rproc_probe(struct platform_device *pdev) drproc = rproc->priv; drproc->rproc = rproc; + rproc->has_iommu = false; platform_set_drvdata(pdev, rproc); diff --git a/drivers/remoteproc/omap_remoteproc.c b/drivers/remoteproc/omap_remoteproc.c index e85f30370760..b74368a91235 100644 --- a/drivers/remoteproc/omap_remoteproc.c +++ b/drivers/remoteproc/omap_remoteproc.c @@ -202,6 +202,8 @@ static int omap_rproc_probe(struct platform_device *pdev) oproc = rproc->priv; oproc->rproc = rproc; + /* All existing OMAP IPU and DSP processors have an MMU */ + rproc->has_iommu = true; platform_set_drvdata(pdev, rproc); diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c index 3cd85a638afa..11cdb119e4f3 100644 --- a/drivers/remoteproc/remoteproc_core.c +++ b/drivers/remoteproc/remoteproc_core.c @@ -94,19 +94,8 @@ static int rproc_enable_iommu(struct rproc *rproc) struct device *dev = rproc->dev.parent; int ret; - /* - * We currently use iommu_present() to decide if an IOMMU - * setup is needed. - * - * This works for simple cases, but will easily fail with - * platforms that do have an IOMMU, but not for this specific - * rproc. - * - * This will be easily solved by introducing hw capabilities - * that will be set by the remoteproc driver. - */ - if (!iommu_present(dev->bus)) { - dev_dbg(dev, "iommu not found\n"); + if (!rproc->has_iommu) { + dev_dbg(dev, "iommu not present\n"); return 0; } diff --git a/drivers/remoteproc/ste_modem_rproc.c b/drivers/remoteproc/ste_modem_rproc.c index 16b7b7bd805b..dd193f35a1ff 100644 --- a/drivers/remoteproc/ste_modem_rproc.c +++ b/drivers/remoteproc/ste_modem_rproc.c @@ -289,6 +289,7 @@ static int sproc_probe(struct platform_device *pdev) sproc = rproc->priv; sproc->mdev = mdev; sproc->rproc = rproc; + rproc->has_iommu = false; mdev->drv_data = sproc; /* Provide callback functions to modem device */ |