arm: tegra: comms: Intel XMM6260 flashless boot.

Add baseband power drivers to manage gpio for turning on modem,
and re-enumerating modem after modem's boot rom has transferred
control to downloaded modem software.

BUG 828389

Original-Change-Id: Ide96a28b8f0183d8328751d3b3dec92b8068a3c8
Reviewed-on: http://git-master/r/39435
Reviewed-by: Varun Colbert <vcolbert@nvidia.com>
Tested-by: Varun Colbert <vcolbert@nvidia.com>

Rebase-Id: Rb3d170a5460bff29550d664c3f783134d2a3a41f

1 files changed, 359 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/baseband-xmm-power2.c b/arch/arm/mach-tegra/baseband-xmm-power2.c
new file mode 100644
index 000000000000..dd79986813a8
--- /dev/null
+++ b/arch/arm/mach-tegra/baseband-xmm-power2.c
@@ -0,0 +1,359 @@
+/*
+ * arch/arm/mach-tegra/baseband-xmm-power2.c
+ *
+ * Copyright (C) 2011 NVIDIA Corporation
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/delay.h>
+#include <linux/fs.h>
+#include <linux/uaccess.h>
+#include <mach/usb_phy.h>
+#include "baseband-xmm-power.h"
+#include "board.h"
+#include "devices.h"
+
+MODULE_LICENSE("GPL");
+
+static struct baseband_power_platform_data *baseband_power2_driver_data;
+
+static enum {
+	IPC_HSIC_SUS_REQ_UNINIT,
+	IPC_HSIC_SUS_REQ_IRQ_READY,
+	IPC_HSIC_SUS_REQ_INIT,
+	IPC_HSIC_SUS_REQ_L,
+	IPC_HSIC_SUS_REQ_H,
+} ipc_hsic_sus_req_state;
+
+static enum {
+	IPC_AP_WAKE_UNINIT,
+	IPC_AP_WAKE_IRQ_READY,
+	IPC_AP_WAKE_INIT1,
+	IPC_AP_WAKE_INIT2,
+	IPC_AP_WAKE_L,
+	IPC_AP_WAKE_H,
+} ipc_ap_wake_state;
+
+static struct workqueue_struct *workqueue;
+static struct work_struct init1_work;
+static struct work_struct init2_work;
+
+static irqreturn_t ipc_hsic_sus_req_irq(int irq, void *dev_id)
+{
+	int value;
+
+	pr_debug("%s\n", __func__);
+
+	/* check for platform data */
+	if (!baseband_power2_driver_data)
+		return IRQ_HANDLED;
+
+	/* IPC_HSIC_SUS_REQ state machine */
+	if (ipc_hsic_sus_req_state < IPC_HSIC_SUS_REQ_IRQ_READY) {
+		pr_err("%s - spurious irq\n", __func__);
+	} else {
+		value = gpio_get_value(baseband_power2_driver_data->
+			modem.xmm.ipc_hsic_sus_req);
+		if (!value) {
+			pr_debug("%s - falling\n", __func__);
+			ipc_hsic_sus_req_state = IPC_HSIC_SUS_REQ_L;
+		} else {
+			pr_debug("%s - rising\n", __func__);
+			ipc_hsic_sus_req_state = IPC_HSIC_SUS_REQ_H;
+		}
+	}
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t ipc_ap_wake_irq(int irq, void *dev_id)
+{
+	int value;
+
+	pr_debug("%s\n", __func__);
+
+	/* check for platform data */
+	if (!baseband_power2_driver_data)
+		return IRQ_HANDLED;
+
+	/* IPC_AP_WAKE state machine */
+	if (ipc_ap_wake_state < IPC_AP_WAKE_IRQ_READY) {
+		pr_err("%s - spurious irq\n", __func__);
+	} else if (ipc_ap_wake_state == IPC_AP_WAKE_IRQ_READY) {
+		value = gpio_get_value(baseband_power2_driver_data->
+			modem.xmm.ipc_ap_wake);
+		if (!value) {
+			pr_debug("%s - IPC_AP_WAKE_INIT1 - got falling edge\n",
+				__func__);
+			/* go to IPC_AP_WAKE_INIT1 state */
+			ipc_ap_wake_state = IPC_AP_WAKE_INIT1;
+			/* queue work */
+			queue_work(workqueue, &init1_work);
+		} else {
+			pr_debug("%s - IPC_AP_WAKE_INIT1 - wait for falling edge\n",
+				__func__);
+		}
+	} else if (ipc_ap_wake_state == IPC_AP_WAKE_INIT1) {
+		value = gpio_get_value(baseband_power2_driver_data->
+			modem.xmm.ipc_ap_wake);
+		if (!value) {
+			pr_debug("%s - IPC_AP_WAKE_INIT2 - wait for rising edge\n",
+				__func__);
+		} else {
+			pr_debug("%s - IPC_AP_WAKE_INIT2 - got rising edge\n",
+				__func__);
+			/* go to IPC_AP_WAKE_INIT2 state */
+			ipc_ap_wake_state = IPC_AP_WAKE_INIT2;
+			/* queue work */
+			queue_work(workqueue, &init2_work);
+		}
+	} else {
+		value = gpio_get_value(baseband_power2_driver_data->
+			modem.xmm.ipc_ap_wake);
+		if (!value) {
+			pr_debug("%s - falling\n", __func__);
+			ipc_ap_wake_state = IPC_AP_WAKE_L;
+		} else {
+			pr_debug("%s - rising\n", __func__);
+			ipc_ap_wake_state = IPC_AP_WAKE_H;
+		}
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void baseband_xmm_power2_init1_work(struct work_struct *work)
+{
+	int value;
+
+	pr_debug("%s {\n", __func__);
+
+	/* check for platform data */
+	if (!baseband_power2_driver_data)
+		return;
+
+	/* check if IPC_HSIC_ACTIVE high */
+	value = gpio_get_value(baseband_power2_driver_data->
+		modem.xmm.ipc_hsic_active);
+	if (value != 1) {
+		pr_err("%s - expected IPC_HSIC_ACTIVE high!\n", __func__);
+		return;
+	}
+
+	/* wait 30 ms */
+	mdelay(30);
+
+	/* set IPC_HSIC_ACTIVE low */
+	gpio_set_value(baseband_power2_driver_data->
+		modem.xmm.ipc_hsic_active, 0);
+
+	pr_debug("%s }\n", __func__);
+}
+
+static void baseband_xmm_power2_init2_work(struct work_struct *work)
+{
+	int value;
+
+	pr_debug("%s {\n", __func__);
+
+	/* check for platform data */
+	if (!baseband_power2_driver_data)
+		return;
+
+	/* check if IPC_HSIC_ACTIVE low */
+	value = gpio_get_value(baseband_power2_driver_data->
+		modem.xmm.ipc_hsic_active);
+	if (value != 0) {
+		pr_err("%s - expected IPC_HSIC_ACTIVE low!\n", __func__);
+		return;
+	}
+
+	/* wait 1 ms */
+	mdelay(1);
+
+	/* turn on usb host controller */
+	{
+		mm_segment_t oldfs;
+		struct file *filp;
+		oldfs = get_fs();
+		set_fs(KERNEL_DS);
+		filp = filp_open("/sys/devices/platform/tegra-ehci.1/ehci_power", O_RDWR, 0);
+		if (!filp) {
+			pr_err("open ehci_power failed\n");
+		} else {
+			filp->f_op->write(filp, "1", 1, &filp->f_pos);
+			filp_close(filp, NULL);
+		}
+		set_fs(oldfs);
+	}
+
+	/* set IPC_HSIC_ACTIVE high */
+	gpio_set_value(baseband_power2_driver_data->
+		modem.xmm.ipc_hsic_active, 1);
+
+	/* wait 20 ms */
+	mdelay(20);
+
+	/* set IPC_HSIC_ACTIVE low */
+	gpio_set_value(baseband_power2_driver_data->
+		modem.xmm.ipc_hsic_active, 0);
+
+	/* wait 20 ms */
+	mdelay(20);
+
+	/* set IPC_HSIC_ACTIVE high */
+	gpio_set_value(baseband_power2_driver_data->
+		modem.xmm.ipc_hsic_active, 1);
+
+	pr_debug("%s }\n", __func__);
+}
+
+static int baseband_xmm_power2_driver_probe(struct platform_device *device)
+{
+	struct baseband_power_platform_data *data
+		= (struct baseband_power_platform_data *) device->dev.platform_data;
+	int err;
+
+	pr_debug("%s\n", __func__);
+
+	/* save platform data */
+	baseband_power2_driver_data = data;
+
+	/* request baseband irq(s) */
+	ipc_hsic_sus_req_state = IPC_HSIC_SUS_REQ_UNINIT;
+	err = request_irq(gpio_to_irq(data->modem.xmm.ipc_hsic_sus_req),
+		ipc_hsic_sus_req_irq,
+		IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+		"IPC_HSIC_SUS_REQ_IRQ",
+		NULL);
+	if (err < 0) {
+		pr_err("%s - request irq IPC_HSIC_SUS_REQ_IRQ failed\n",
+			__func__);
+		return err;
+	}
+	ipc_hsic_sus_req_state = IPC_HSIC_SUS_REQ_IRQ_READY;
+	ipc_ap_wake_state = IPC_AP_WAKE_UNINIT;
+	err = request_irq(gpio_to_irq(data->modem.xmm.ipc_ap_wake),
+		ipc_ap_wake_irq,
+		IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+		"IPC_AP_WAKE_IRQ",
+		NULL);
+	if (err < 0) {
+		pr_err("%s - request irq IPC_AP_WAKE_IRQ failed\n",
+			__func__);
+		return err;
+	}
+	ipc_ap_wake_state = IPC_AP_WAKE_IRQ_READY;
+
+	/* init work queue */
+	workqueue = create_singlethread_workqueue
+		("baseband_power_workqueue");
+	if (!workqueue) {
+		pr_err("cannot create workqueue\n");
+		return -1;
+	}
+	INIT_WORK(&init1_work, baseband_xmm_power2_init1_work);
+	INIT_WORK(&init2_work, baseband_xmm_power2_init2_work);
+
+	return 0;
+}
+
+static int baseband_xmm_power2_driver_remove(struct platform_device *device)
+{
+	pr_debug("%s\n", __func__);
+
+	/* check for platform data */
+	if (!baseband_power2_driver_data)
+		return 0;
+
+	/* free baseband irq(s) */
+	free_irq(gpio_to_irq(baseband_power2_driver_data
+		->modem.xmm.ipc_ap_wake), NULL);
+	free_irq(gpio_to_irq(baseband_power2_driver_data
+		->modem.xmm.ipc_hsic_sus_req), NULL);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int baseband_xmm_power2_driver_suspend(struct platform_device *device,
+	pm_message_t state)
+{
+	pr_debug("%s\n", __func__);
+
+	/* check for platform data */
+	if (!baseband_power2_driver_data)
+		return 0;
+
+	/* signal bb to suspend hsic */
+	gpio_set_value(baseband_power2_driver_data
+		->modem.xmm.ipc_hsic_active, 0);
+
+	return 0;
+}
+
+static int baseband_xmm_power2_driver_resume(struct platform_device *device)
+{
+	pr_debug("%s\n", __func__);
+
+	/* check for platform data */
+	if (!baseband_power2_driver_data)
+		return 0;
+
+	/* wake bb */
+	gpio_set_value(baseband_power2_driver_data
+		->modem.xmm.ipc_bb_wake, 1);
+
+	/* signal bb to resume hsic */
+	gpio_set_value(baseband_power2_driver_data
+		->modem.xmm.ipc_hsic_active, 1);
+
+	return 0;
+}
+#endif
+
+static struct platform_driver baseband_power2_driver = {
+	.probe = baseband_xmm_power2_driver_probe,
+	.remove = baseband_xmm_power2_driver_remove,
+#ifdef CONFIG_PM
+	.suspend = baseband_xmm_power2_driver_suspend,
+	.resume = baseband_xmm_power2_driver_resume,
+#endif
+	.driver = {
+		.name = "baseband_xmm_power2",
+	},
+};
+
+static int __init baseband_xmm_power2_init(void)
+{
+	pr_debug("%s\n", __func__);
+	return platform_driver_register(&baseband_power2_driver);
+}
+
+static int __exit baseband_xmm_power2_exit(void)
+{
+	pr_debug("%s\n", __func__);
+	platform_driver_unregister(&baseband_power2_driver);
+	return 0;
+}
+
+module_init(baseband_xmm_power2_init)
+module_exit(baseband_xmm_power2_exit)
+