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Merge branch 'omap-for-v4.1/ocp2scp' into omap-for-v4.1/fixes-not-urgent

This commit is contained in:
Tony Lindgren 2015-03-26 10:48:49 -07:00
parent afda768f88 cdf61240e1
commit e129fdb9b2
3 changed files with 38 additions and 3 deletions
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3
Documentation/devicetree/bindings/bus/omap-ocp2scp.txt
View File

@ -1,7 +1,8 @@
* OMAP OCP2SCP - ocp interface to scp interface
properties:
- compatible : Should be "ti,omap-ocp2scp"
- compatible : Should be "ti,am437x-ocp2scp" for AM437x processor
Should be "ti,omap-ocp2scp" for all others
- reg : Address and length of the register set for the device
- #address-cells, #size-cells : Must be present if the device has sub-nodes
- ranges : the child address space are mapped 1:1 onto the parent address space

4
arch/arm/boot/dts/am4372.dtsi
View File

@ -787,7 +787,7 @@
};
ocp2scp0: ocp2scp@483a8000 {
compatible = "ti,omap-ocp2scp";
compatible = "ti,am437x-ocp2scp", "ti,omap-ocp2scp";
#address-cells = <1>;
#size-cells = <1>;
ranges;
@ -806,7 +806,7 @@
};
ocp2scp1: ocp2scp@483e8000 {
compatible = "ti,omap-ocp2scp";
compatible = "ti,am437x-ocp2scp", "ti,omap-ocp2scp";
#address-cells = <1>;
#size-cells = <1>;
ranges;

34
drivers/bus/omap-ocp2scp.c
View File

@ -16,6 +16,7 @@
*
*/
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/err.h>
@ -23,6 +24,9 @@
#include <linux/of.h>
#include <linux/of_platform.h>
#define OCP2SCP_TIMING 0x18
#define SYNC2_MASK 0xf
static int ocp2scp_remove_devices(struct device *dev, void *c)
{
struct platform_device *pdev = to_platform_device(dev);
@ -35,6 +39,9 @@ static int ocp2scp_remove_devices(struct device *dev, void *c)
static int omap_ocp2scp_probe(struct platform_device *pdev)
{
int ret;
u32 reg;
void __iomem *regs;
struct resource *res;
struct device_node *np = pdev->dev.of_node;
if (np) {
@ -47,6 +54,32 @@ static int omap_ocp2scp_probe(struct platform_device *pdev)
}
pm_runtime_enable(&pdev->dev);
/*
* As per AM572x TRM: http://www.ti.com/lit/ug/spruhz6/spruhz6.pdf
* under section 26.3.2.2, table 26-26 OCP2SCP TIMING Caution;
* As per OMAP4430 TRM: http://www.ti.com/lit/ug/swpu231ap/swpu231ap.pdf
* under section 23.12.6.2.2 , Table 23-1213 OCP2SCP TIMING Caution;
* As per OMAP4460 TRM: http://www.ti.com/lit/ug/swpu235ab/swpu235ab.pdf
* under section 23.12.6.2.2, Table 23-1213 OCP2SCP TIMING Caution;
* As per OMAP543x TRM http://www.ti.com/lit/pdf/swpu249
* under section 27.3.2.2, Table 27-27 OCP2SCP TIMING Caution;
*
* Read path of OCP2SCP is not working properly due to low reset value
* of SYNC2 parameter in OCP2SCP. Suggested reset value is 0x6 or more.
*/
if (!of_device_is_compatible(np, "ti,am437x-ocp2scp")) {
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(regs))
goto err0;
pm_runtime_get_sync(&pdev->dev);
reg = readl_relaxed(regs + OCP2SCP_TIMING);
reg &= ~(SYNC2_MASK);
reg |= 0x6;
writel_relaxed(reg, regs + OCP2SCP_TIMING);
pm_runtime_put_sync(&pdev->dev);
}
return 0;
@ -67,6 +100,7 @@ static int omap_ocp2scp_remove(struct platform_device *pdev)
#ifdef CONFIG_OF
static const struct of_device_id omap_ocp2scp_id_table[] = {
{ .compatible = "ti,omap-ocp2scp" },
{ .compatible = "ti,am437x-ocp2scp" },
{}
};
MODULE_DEVICE_TABLE(of, omap_ocp2scp_id_table);