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greybus: arche-platform: Introduce coldboot_seq fn

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This is preparation for support for different operational states
(defined by arche_platform_state) in the driver, to enable
user/developer to dynamically configure the state.

arche_platform_coldboot_seq() fn will be responsible for
rebooting SVC device.

Testing Done: Tested on EVT1.2 and DB3.5 platform

Signed-off-by: Vaibhav Hiremath <vaibhav.hiremath@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Vaibhav Hiremath 2016-02-13 02:04:03 +05:30 committed by Greg Kroah-Hartman
parent a821adb47d
commit 758ca99de9
1 changed files with 34 additions and 15 deletions
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49
drivers/staging/greybus/arche-platform.c
View file

@ -104,6 +104,32 @@ static void unexport_gpios(struct arche_platform_drvdata *arche_pdata)
gpio_unexport(arche_pdata->svc_sysboot_gpio);
}
static int arche_platform_coldboot_seq(struct arche_platform_drvdata *arche_pdata)
{
int ret;
dev_info(arche_pdata->dev, "Booting from cold boot state\n");
svc_reset_onoff(arche_pdata->svc_reset_gpio,
arche_pdata->is_reset_act_hi);
gpio_set_value(arche_pdata->svc_sysboot_gpio, 0);
usleep_range(100, 200);
ret = clk_prepare_enable(arche_pdata->svc_ref_clk);
if (ret) {
dev_err(arche_pdata->dev, "failed to enable svc_ref_clk: %d\n",
ret);
return ret;
}
/* bring SVC out of reset */
svc_reset_onoff(arche_pdata->svc_reset_gpio,
!arche_pdata->is_reset_act_hi);
return 0;
}
static void arche_platform_cleanup(struct arche_platform_drvdata *arche_pdata)
{
clk_disable_unprepare(arche_pdata->svc_ref_clk);
@ -185,11 +211,6 @@ static int arche_platform_probe(struct platform_device *pdev)
dev_err(dev, "failed to get svc_ref_clk: %d\n", ret);
return ret;
}
ret = clk_prepare_enable(arche_pdata->svc_ref_clk);
if (ret) {
dev_err(dev, "failed to enable svc_ref_clk: %d\n", ret);
return ret;
}
platform_set_drvdata(pdev, arche_pdata);
@ -200,34 +221,32 @@ static int arche_platform_probe(struct platform_device *pdev)
if (arche_pdata->wake_detect_gpio < 0) {
dev_err(dev, "failed to get wake detect gpio\n");
ret = arche_pdata->wake_detect_gpio;
goto exit;
return ret;
}
ret = devm_gpio_request(dev, arche_pdata->wake_detect_gpio, "wake detect");
if (ret) {
dev_err(dev, "Failed requesting wake_detect gpio %d\n",
arche_pdata->wake_detect_gpio);
goto exit;
return ret;
}
/* deassert wake detect */
gpio_direction_output(arche_pdata->wake_detect_gpio, 0);
/* bring SVC out of reset */
svc_reset_onoff(arche_pdata->svc_reset_gpio,
!arche_pdata->is_reset_act_hi);
arche_pdata->dev = &pdev->dev;
INIT_DELAYED_WORK(&arche_pdata->delayed_work, svc_delayed_work);
schedule_delayed_work(&arche_pdata->delayed_work, msecs_to_jiffies(2000));
ret = arche_platform_coldboot_seq(arche_pdata);
if (ret) {
dev_err(dev, "Failed to cold boot svc %d\n", ret);
return ret;
}
export_gpios(arche_pdata);
dev_info(dev, "Device registered successfully\n");
return 0;
exit:
arche_platform_cleanup(arche_pdata);
return ret;
}
static int arche_remove_child(struct device *dev, void *unused)