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usb: chipidea: msm: Add proper clk and reset support 

The msm chipidea controller uses two main clks, an AHB clk to
read/write the MMIO registers and a core clk called the system
clk that drives the controller itself. Add support for these clks
as they're required in all designs.

Also add support for an optional third clk that we need to turn
on to reset the controller and wrapper logic and other
"housekeeping" things. This clk was removed in later revisions of
the hardware because the reset methodology no longer required
clks to be enabled to propagate resets.

Acked-by: Peter Chen <peter.chen@nxp.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org>
Signed-off-by: Peter Chen <peter.chen@nxp.com>
This commit is contained in:
Stephen Boyd 2016-12-28 14:57:01 -08:00 committed by Peter Chen
parent ee33f6e70b
commit e9f15a71f1
1 changed files with 68 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

72
drivers/usb/chipidea/ci_hdrc_msm.c
View File

@ -10,11 +10,20 @@
#include <linux/pm_runtime.h>
#include <linux/usb/gadget.h>
#include <linux/usb/chipidea.h>
#include <linux/clk.h>
#include <linux/reset.h>
#include "ci.h"
#define HS_PHY_AHB_MODE 0x0098
struct ci_hdrc_msm {
struct platform_device *ci;
struct clk *core_clk;
struct clk *iface_clk;
struct clk *fs_clk;
};
static void ci_hdrc_msm_notify_event(struct ci_hdrc *ci, unsigned event)
{
struct device *dev = ci->gadget.dev.parent;
@ -52,11 +61,20 @@ static struct ci_hdrc_platform_data ci_hdrc_msm_platdata = {
static int ci_hdrc_msm_probe(struct platform_device *pdev)
{
struct ci_hdrc_msm *ci;
struct platform_device *plat_ci;
struct usb_phy *phy;
struct clk *clk;
struct reset_control *reset;
int ret;
dev_dbg(&pdev->dev, "ci_hdrc_msm_probe\n");
ci = devm_kzalloc(&pdev->dev, sizeof(*ci), GFP_KERNEL);
if (!ci)
return -ENOMEM;
platform_set_drvdata(pdev, ci);
/*
* OTG(PHY) driver takes care of PHY initialization, clock management,
* powering up VBUS, mapping of registers address space and power
@ -68,29 +86,75 @@ static int ci_hdrc_msm_probe(struct platform_device *pdev)
ci_hdrc_msm_platdata.usb_phy = phy;
reset = devm_reset_control_get(&pdev->dev, "core");
if (IS_ERR(reset))
return PTR_ERR(reset);
ci->core_clk = clk = devm_clk_get(&pdev->dev, "core");
if (IS_ERR(clk))
return PTR_ERR(clk);
ci->iface_clk = clk = devm_clk_get(&pdev->dev, "iface");
if (IS_ERR(clk))
return PTR_ERR(clk);
ci->fs_clk = clk = devm_clk_get(&pdev->dev, "fs");
if (IS_ERR(clk)) {
if (PTR_ERR(clk) == -EPROBE_DEFER)
return -EPROBE_DEFER;
ci->fs_clk = NULL;
}
ret = clk_prepare_enable(ci->fs_clk);
if (ret)
return ret;
reset_control_assert(reset);
usleep_range(10000, 12000);
reset_control_deassert(reset);
clk_disable_unprepare(ci->fs_clk);
ret = clk_prepare_enable(ci->core_clk);
if (ret)
return ret;
ret = clk_prepare_enable(ci->iface_clk);
if (ret)
goto err_iface;
plat_ci = ci_hdrc_add_device(&pdev->dev,
pdev->resource, pdev->num_resources,
&ci_hdrc_msm_platdata);
if (IS_ERR(plat_ci)) {
dev_err(&pdev->dev, "ci_hdrc_add_device failed!\n");
return PTR_ERR(plat_ci);
ret = PTR_ERR(plat_ci);
goto err_mux;
}
platform_set_drvdata(pdev, plat_ci);
ci->ci = plat_ci;
pm_runtime_set_active(&pdev->dev);
pm_runtime_no_callbacks(&pdev->dev);
pm_runtime_enable(&pdev->dev);
return 0;
err_mux:
clk_disable_unprepare(ci->iface_clk);
err_iface:
clk_disable_unprepare(ci->core_clk);
return ret;
}
static int ci_hdrc_msm_remove(struct platform_device *pdev)
{
struct platform_device *plat_ci = platform_get_drvdata(pdev);
struct ci_hdrc_msm *ci = platform_get_drvdata(pdev);
pm_runtime_disable(&pdev->dev);
ci_hdrc_remove_device(plat_ci);
ci_hdrc_remove_device(ci->ci);
clk_disable_unprepare(ci->iface_clk);
clk_disable_unprepare(ci->core_clk);
return 0;
}