kernel/drivers/memory/tegra30-mc.c, branch linux-rolling-stable

memory: Add NVIDIA Tegra memory controller support

2014-12-04T15:11:47Z

The memory controller on NVIDIA Tegra exposes various knobs that can be used to tune the behaviour of the clients attached to it. Currently this driver sets up the latency allowance registers to the HW defaults. Eventually an API should be exported by this driver (via a custom API or a generic subsystem) to allow clients to register latency requirements. This driver also registers an IOMMU (SMMU) that's implemented by the memory controller. It is supported on Tegra30, Tegra114 and Tegra124 currently. Tegra20 has a GART instead. The Tegra SMMU operates on memory clients and SWGROUPs. A memory client is a unidirectional, special-purpose DMA master. A SWGROUP represents a set of memory clients that form a logical functional unit corresponding to a single device. Typically a device has two clients: one client for read transactions and one client for write transactions, but there are also devices that have only read clients, but many of them (such as the display controllers). Because there is no 1:1 relationship between memory clients and devices the driver keeps a table of memory clients and the SWGROUPs that they belong to per SoC. Note that this is an exception and due to the fact that the SMMU is tightly integrated with the rest of the Tegra SoC. The use of these tables is discouraged in drivers for generic IOMMU devices such as the ARM SMMU because the same IOMMU could be used in any number of SoCs and keeping such tables for each SoC would not scale. Acked-by: Joerg Roedel Signed-off-by: Thierry Reding

tegra: simplify use of devm_ioremap_resource

2013-08-15T22:04:42Z

Remove unneeded error handling on the result of a call to platform_get_resource when the value is passed to devm_ioremap_resource. A simplified version of the semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // @@ expression pdev,res,n,e,e1; expression ret != 0; identifier l; @@ - res = platform_get_resource(pdev, IORESOURCE_MEM, n); ... when != res - if (res == NULL) { ... \(goto l;\|return ret;\) } ... when != res + res = platform_get_resource(pdev, IORESOURCE_MEM, n); e = devm_ioremap_resource(e1, res); // Signed-off-by: Julia Lawall Signed-off-by: Stephen Warren

memory: tegra30-mc: Fix IRQ handler.

2013-06-17T23:46:06Z

In Tegra30 any memory controller interrupt would cause an infinite loop in the IRQ handler. Additionally, a garbage pointer was used to read the MC status registers, which causes wrong values to be printed if a MC error occurred. Signed-off-by: Tuomas Tynkkynen Reviewed-by: Stephen Warren Reviewed-by: Thierry Reding Signed-off-by: Greg Kroah-Hartman

memory: tegra30: Fix build error w/o PM

2013-03-15T18:10:49Z

Make this depend on CONFIG_PM. Signed-off-by: Hiroshi Doyu Reviewed-by: Thierry Reding Signed-off-by: Greg Kroah-Hartman

memory: Convert to devm_ioremap_resource()

2013-01-22T19:41:56Z

Convert all uses of devm_request_and_ioremap() to the newly introduced devm_ioremap_resource() which provides more consistent error handling. devm_ioremap_resource() provides its own error messages so all explicit error messages can be removed from the failure code paths. Signed-off-by: Thierry Reding Signed-off-by: Greg Kroah-Hartman

Drivers: memory: remove __dev* attributes.

2013-01-03T23:57:14Z

CONFIG_HOTPLUG is going away as an option. As a result, the __dev* markings need to be removed. This change removes the use of __devinit, __devexit_p, and __devinitconst, from these drivers. Based on patches originally written by Bill Pemberton, but redone by me in order to handle some of the coding style issues better, by hand. Cc: Bill Pemberton Cc: Hiroshi DOYU Cc: Stephen Warren Cc: Axel Lin Signed-off-by: Greg Kroah-Hartman

memory: tegra{20,30}-mc: Fix reading incorrect register in mc_readl()

2012-09-26T21:04:09Z

The code reading the register does not match the code writing to the register, fix it. Also fix the coding style in mc_writel() for better readability. Signed-off-by: Axel Lin Acked-by: Stephen Warren Tested-by: Stephen Warren Signed-off-by: Greg Kroah-Hartman

memory: tegra{20,30}-mc: Remove empty *_remove()

2012-05-14T19:52:52Z

Remove unnecessary empty functions. Signed-off-by: Hiroshi DOYU Signed-off-by: Greg Kroah-Hartman

memory: tegra{20,30}-mc: Use dev_err_ratelimited()

2012-05-14T15:47:11Z

Introduce a new dev_*_ratelimited() instead of pr_*_ratelimited() for better info to print. Signed-off-by: Hiroshi DOYU Signed-off-by: Greg Kroah-Hartman

ARM: tegra30: MC: Remove unnecessary BUG*()

2012-05-11T22:21:27Z

Accessing interleaved MC register offsets/ranges are verified. BUG*()s in accessors can be removed. Signed-off-by: Hiroshi DOYU Signed-off-by: Greg Kroah-Hartman