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Message-ID: <1338375394-16268-4-git-send-email-kishon@ti.com>
Date: Wed, 30 May 2012 16:26:32 +0530
From: Kishon Vijay Abraham I <kishon@...com>
To: <paul@...an.com>, <tony@...mide.com>, <linux@....linux.org.uk>,
<b-cousson@...com>, <arnd@...db.de>, <gregkh@...uxfoundation.org>,
<kishon@...com>, <linux-omap@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <balbi@...com>
Subject: [RFC PATCH 3/5] drivers: misc: omap: add a new driver for ocp2scp
Adds a new driver _ocp2scp_. This driver takes the responsibility of creating
all the devices that is connected to OCP2SCP. In the case of OMAP4, USB2PHY
is connected to ocp2scp.
Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
drivers/misc/Kconfig | 8 ++
drivers/misc/Makefile | 1 +
drivers/misc/omap-ocp2scp.c | 135 ++++++++++++++++++++++++++++
include/linux/platform_data/omap_ocp2scp.h | 31 +++++++
4 files changed, 175 insertions(+), 0 deletions(-)
create mode 100644 drivers/misc/omap-ocp2scp.c
create mode 100644 include/linux/platform_data/omap_ocp2scp.h
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 2661f6e..c70aa15 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -508,6 +508,14 @@ config USB_SWITCH_FSA9480
stereo and mono audio, video, microphone and UART data to use
a common connector port.
+config OMAP_OCP2SCP
+ tristate "OMAP OCP2SCP DRIVER"
+ help
+ Driver to enable ocp2scp module which transforms ocp interface
+ protocol to scp protocol. In OMAP4, USB PHY is connected via
+ OCP2SCP and in OMAP5, both USB PHY and SATA PHY is connected via
+ OCP2SCP.
+
source "drivers/misc/c2port/Kconfig"
source "drivers/misc/eeprom/Kconfig"
source "drivers/misc/cb710/Kconfig"
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 456972f..4d7c8ce 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -50,4 +50,5 @@ obj-y += lis3lv02d/
obj-y += carma/
obj-$(CONFIG_USB_SWITCH_FSA9480) += fsa9480.o
obj-$(CONFIG_ALTERA_STAPL) +=altera-stapl/
+obj-$(CONFIG_OMAP_OCP2SCP) += omap-ocp2scp.o
obj-$(CONFIG_INTEL_MEI) += mei/
diff --git a/drivers/misc/omap-ocp2scp.c b/drivers/misc/omap-ocp2scp.c
new file mode 100644
index 0000000..c53b9f4
--- /dev/null
+++ b/drivers/misc/omap-ocp2scp.c
@@ -0,0 +1,135 @@
+/*
+ * omap-ocp2scp.c - transform ocp interface protocol to scp protocol
+ *
+ * Copyright (C) 2011 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@...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.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/pm_runtime.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)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+
+ platform_device_unregister(pdev);
+
+ return 0;
+}
+
+static int __devinit omap_ocp2scp_probe(struct platform_device *pdev)
+{
+ int ret;
+ unsigned res_cnt, i;
+ struct platform_device *pdev_child;
+ struct omap_ocp2scp_platform_data *pdata;
+ struct omap_ocp2scp_dev *dev;
+
+ pdata = pdev->dev.platform_data;
+ if (!pdata) {
+ dev_err(&pdev->dev, "OCP2SCP initialized without plat data\n");
+ return -EINVAL;
+ }
+
+ 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, -1);
+ if (!pdev_child) {
+ dev_err(&pdev->dev, "failed to allocate memory for ocp2scp child\n");
+ return -ENOMEM;
+ }
+
+ 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 err0;
+ }
+
+ 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 err0;
+ }
+ }
+
+ pm_runtime_enable(&pdev->dev);
+
+ return 0;
+
+err0:
+ platform_device_put(pdev_child);
+ device_for_each_child(&pdev->dev, NULL, ocp2scp_remove_devices);
+
+ return ret;
+}
+
+static int __devexit omap_ocp2scp_remove(struct platform_device *pdev)
+{
+ pm_runtime_disable(&pdev->dev);
+ device_for_each_child(&pdev->dev, NULL, ocp2scp_remove_devices);
+
+ return 0;
+}
+
+static struct platform_driver omap_ocp2scp_driver = {
+ .probe = omap_ocp2scp_probe,
+ .remove = __devexit_p(omap_ocp2scp_remove),
+ .driver = {
+ .name = "omap-ocp2scp",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init omap_ocp2scp_init(void)
+{
+ return platform_driver_register(&omap_ocp2scp_driver);
+}
+arch_initcall(omap_ocp2scp_init);
+
+static void __exit omap_ocp2scp_exit(void)
+{
+ platform_driver_unregister(&omap_ocp2scp_driver);
+}
+module_exit(omap_ocp2scp_exit);
+
+MODULE_ALIAS("platform: omap-ocp2scp");
+MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@...com>");
+MODULE_DESCRIPTION("OMAP OCP2SCP DRIVER");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/platform_data/omap_ocp2scp.h b/include/linux/platform_data/omap_ocp2scp.h
new file mode 100644
index 0000000..dcbbf2a
--- /dev/null
+++ b/include/linux/platform_data/omap_ocp2scp.h
@@ -0,0 +1,31 @@
+/*
+ * omap_ocp2scp.h -- ocp2scp header file
+ *
+ * Copyright (C) 2011 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@...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 */
--
1.7.5.4
--
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