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This series fixes an annoying regression to make MUSB working

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on omap4 again. Although it's getting rather late for these
 changes for the -rc cycle, it is important as many devices
 are using MUSB for charging and connectivity.
 
 With the USB PHY changes, MUSB started using the newly added
 drivers/usb/phy/omap-usb2.c driver introduced by commit
 657b306a (usb: phy: add a new driver for omap usb2 phy)
 that is using the newly introduced drivers/bus/omap-ocp2scp.c
 introduced by commit 26a84b3e (drivers: bus: add a new driver
 for omap-ocp2scp).
 
 These changes allowed dropping a lot of PHY related code from
 arch/arm/mach-omap2/omap_phy_internal.c and have it live in
 the device driver like it should with commit c9e4412a (arm: omap:
 phy: remove unused functions from omap-phy-internal.c).
 
 However, MUSB on omap4 broke with these changes for legacy
 platform data boot, and now only works with device tree for
 omap4. Unfortunately we are still few critical bindings away
 from being able to make omap4 usbale with device tree.
 
 Fix the regression properly by adding platform data support
 to the ocp2scp driver so we can avoid adding back the driver
 code to arch/arm/mach-omap2.
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Merge tag 'omap-for-v3.7-rc4/musb-regression-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap into fixes

From Tony Lindgren <tony@atomide.com>:

This series fixes an annoying regression to make MUSB working
on omap4 again. Although it's getting rather late for these
changes for the -rc cycle, it is important as many devices
are using MUSB for charging and connectivity.

With the USB PHY changes, MUSB started using the newly added
drivers/usb/phy/omap-usb2.c driver introduced by commit
657b306a (usb: phy: add a new driver for omap usb2 phy)
that is using the newly introduced drivers/bus/omap-ocp2scp.c
introduced by commit 26a84b3e (drivers: bus: add a new driver
for omap-ocp2scp).

These changes allowed dropping a lot of PHY related code from
arch/arm/mach-omap2/omap_phy_internal.c and have it live in
the device driver like it should with commit c9e4412a (arm: omap:
phy: remove unused functions from omap-phy-internal.c).

However, MUSB on omap4 broke with these changes for legacy
platform data boot, and now only works with device tree for
omap4. Unfortunately we are still few critical bindings away
from being able to make omap4 usbale with device tree.

Fix the regression properly by adding platform data support
to the ocp2scp driver so we can avoid adding back the driver
code to arch/arm/mach-omap2.

* tag 'omap-for-v3.7-rc4/musb-regression-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap:
  ARM: OMAP: ocp2scp: create omap device for ocp2scp
  ARM: OMAP4: add _dev_attr_ to ocp2scp for representing usb_phy
  drivers: bus: ocp2scp: add pdata support

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2012-11-12 17:19:29 +01:00
commit 69178dfeb1
4 changed files with 203 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

79
arch/arm/mach-omap2/devices.c
View File

@ -19,6 +19,7 @@
#include <linux/of.h>
#include <linux/pinctrl/machine.h>
#include <linux/platform_data/omap4-keypad.h>
#include <linux/platform_data/omap_ocp2scp.h>
#include <asm/mach-types.h>
#include <asm/mach/map.h>
@ -613,6 +614,83 @@ static void omap_init_vout(void)
static inline void omap_init_vout(void) {}
#endif
#if defined(CONFIG_OMAP_OCP2SCP) || defined(CONFIG_OMAP_OCP2SCP_MODULE)
static int count_ocp2scp_devices(struct omap_ocp2scp_dev *ocp2scp_dev)
{
int cnt = 0;
while (ocp2scp_dev->drv_name != NULL) {
cnt++;
ocp2scp_dev++;
}
return cnt;
}
static void omap_init_ocp2scp(void)
{
struct omap_hwmod *oh;
struct platform_device *pdev;
int bus_id = -1, dev_cnt = 0, i;
struct omap_ocp2scp_dev *ocp2scp_dev;
const char *oh_name, *name;
struct omap_ocp2scp_platform_data *pdata;
if (!cpu_is_omap44xx())
return;
oh_name = "ocp2scp_usb_phy";
name = "omap-ocp2scp";
oh = omap_hwmod_lookup(oh_name);
if (!oh) {
pr_err("%s: could not find omap_hwmod for %s\n", __func__,
oh_name);
return;
}
pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
if (!pdata) {
pr_err("%s: No memory for ocp2scp pdata\n", __func__);
return;
}
ocp2scp_dev = oh->dev_attr;
dev_cnt = count_ocp2scp_devices(ocp2scp_dev);
if (!dev_cnt) {
pr_err("%s: No devices connected to ocp2scp\n", __func__);
kfree(pdata);
return;
}
pdata->devices = kzalloc(sizeof(struct omap_ocp2scp_dev *)
* dev_cnt, GFP_KERNEL);
if (!pdata->devices) {
pr_err("%s: No memory for ocp2scp pdata devices\n", __func__);
kfree(pdata);
return;
}
for (i = 0; i < dev_cnt; i++, ocp2scp_dev++)
pdata->devices[i] = ocp2scp_dev;
pdata->dev_cnt = dev_cnt;
pdev = omap_device_build(name, bus_id, oh, pdata, sizeof(*pdata), NULL,
0, false);
if (IS_ERR(pdev)) {
pr_err("Could not build omap_device for %s %s\n",
name, oh_name);
kfree(pdata->devices);
kfree(pdata);
return;
}
}
#else
static inline void omap_init_ocp2scp(void) { }
#endif
/*-------------------------------------------------------------------------*/
static int __init omap2_init_devices(void)
@ -640,6 +718,7 @@ static int __init omap2_init_devices(void)
omap_init_sham();
omap_init_aes();
omap_init_vout();
omap_init_ocp2scp();
return 0;
}

28
arch/arm/mach-omap2/omap_hwmod_44xx_data.c
View File

@ -21,6 +21,7 @@
#include <linux/io.h>
#include <linux/platform_data/gpio-omap.h>
#include <linux/power/smartreflex.h>
#include <linux/platform_data/omap_ocp2scp.h>
#include <plat/omap_hwmod.h>
#include <plat/i2c.h>
@ -2681,6 +2682,32 @@ static struct omap_hwmod_class omap44xx_ocp2scp_hwmod_class = {
.sysc = &omap44xx_ocp2scp_sysc,
};
/* ocp2scp dev_attr */
static struct resource omap44xx_usb_phy_and_pll_addrs[] = {
{
.name = "usb_phy",
.start = 0x4a0ad080,
.end = 0x4a0ae000,
.flags = IORESOURCE_MEM,
},
{
/* XXX: Remove this once control module driver is in place */
.name = "ctrl_dev",
.start = 0x4a002300,
.end = 0x4a002303,
.flags = IORESOURCE_MEM,
},
{ }
};
static struct omap_ocp2scp_dev ocp2scp_dev_attr[] = {
{
.drv_name = "omap-usb2",
.res = omap44xx_usb_phy_and_pll_addrs,
},
{ }
};
/* ocp2scp_usb_phy */
static struct omap_hwmod omap44xx_ocp2scp_usb_phy_hwmod = {
.name = "ocp2scp_usb_phy",
@ -2694,6 +2721,7 @@ static struct omap_hwmod omap44xx_ocp2scp_usb_phy_hwmod = {
.modulemode = MODULEMODE_HWCTRL,
},
},
.dev_attr = ocp2scp_dev_attr,
};
/*

68
drivers/bus/omap-ocp2scp.c
View File

@ -22,6 +22,26 @@
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_data/omap_ocp2scp.h>
/**
* _count_resources - count for the number of resources
* @res: struct resource *
*
* Count and return the number of resources populated for the device that is
* connected to ocp2scp.
*/
static unsigned _count_resources(struct resource *res)
{
int cnt = 0;
while (res->start != res->end) {
cnt++;
res++;
}
return cnt;
}
static int ocp2scp_remove_devices(struct device *dev, void *c)
{
@ -34,20 +54,62 @@ static int ocp2scp_remove_devices(struct device *dev, void *c)
static int __devinit omap_ocp2scp_probe(struct platform_device *pdev)
{
int ret;
struct device_node *np = pdev->dev.of_node;
int ret;
unsigned res_cnt, i;
struct device_node *np = pdev->dev.of_node;
struct platform_device *pdev_child;
struct omap_ocp2scp_platform_data *pdata = pdev->dev.platform_data;
struct omap_ocp2scp_dev *dev;
if (np) {
ret = of_platform_populate(np, NULL, NULL, &pdev->dev);
if (ret) {
dev_err(&pdev->dev, "failed to add resources for ocp2scp child\n");
dev_err(&pdev->dev,
"failed to add resources for ocp2scp child\n");
goto err0;
}
} else if (pdata) {
for (i = 0, dev = *pdata->devices; i < pdata->dev_cnt; i++,
dev++) {
res_cnt = _count_resources(dev->res);
pdev_child = platform_device_alloc(dev->drv_name,
PLATFORM_DEVID_AUTO);
if (!pdev_child) {
dev_err(&pdev->dev,
"failed to allocate mem for ocp2scp child\n");
goto err0;
}
ret = platform_device_add_resources(pdev_child,
dev->res, res_cnt);
if (ret) {
dev_err(&pdev->dev,
"failed to add resources for ocp2scp child\n");
goto err1;
}
pdev_child->dev.parent = &pdev->dev;
ret = platform_device_add(pdev_child);
if (ret) {
dev_err(&pdev->dev,
"failed to register ocp2scp child device\n");
goto err1;
}
}
} else {
dev_err(&pdev->dev, "OCP2SCP initialized without plat data\n");
return -EINVAL;
}
pm_runtime_enable(&pdev->dev);
return 0;
err1:
platform_device_put(pdev_child);
err0:
device_for_each_child(&pdev->dev, NULL, ocp2scp_remove_devices);

31
include/linux/platform_data/omap_ocp2scp.h Normal file
View File

@ -0,0 +1,31 @@
/*
* omap_ocp2scp.h -- ocp2scp header file
*
* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Author: Kishon Vijay Abraham I <kishon@ti.com>
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#ifndef __DRIVERS_OMAP_OCP2SCP_H
#define __DRIVERS_OMAP_OCP2SCP_H
struct omap_ocp2scp_dev {
const char *drv_name;
struct resource *res;
};
struct omap_ocp2scp_platform_data {
int dev_cnt;
struct omap_ocp2scp_dev **devices;
};
#endif /* __DRIVERS_OMAP_OCP2SCP_H */