ARM: tegra: baseband: Add PH450 modem init and reset functions

Add PH450 modem init and reset functions for Tegra Enterprise.
Bug 800301

Change-Id: I7068fa87118c2388badb664da3d1a83a3eb49dae
Reviewed-on: http://git-master/r/30920
Reviewed-by: Varun Colbert <vcolbert@nvidia.com>
Tested-by: Varun Colbert <vcolbert@nvidia.com>

Rebase-Id: R5c93eca6b9fd9d45afbc5d42b49d779f6a027a9a

1 files changed, 160 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/board-enterprise-baseband.c b/arch/arm/mach-tegra/board-enterprise-baseband.c
new file mode 100644
index 000000000000..9222f4a074e1
--- /dev/null
+++ b/arch/arm/mach-tegra/board-enterprise-baseband.c
@@ -0,0 +1,160 @@
+/*
+ * arch/arm/mach-tegra/board-enterprise-baseband.c
+ *
+ * Copyright (c) 2011, NVIDIA Corporation.
+ *
+ * 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.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#include <linux/resource.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/err.h>
+#include <linux/platform_data/tegra_usb.h>
+#include <asm/mach-types.h>
+#include <asm/mach/arch.h>
+#include <mach/pinmux.h>
+#include <mach/usb_phy.h>
+#include "devices.h"
+#include "gpio-names.h"
+
+/* T30 BB GPIO */
+#define MODEM_PWR_ON	TEGRA_GPIO_PE0
+#define MODEM_RESET	TEGRA_GPIO_PE1
+
+/* PH450 */
+#define AP2MDM_ACK	TEGRA_GPIO_PE3
+#define MDM2AP_ACK	TEGRA_GPIO_PU5
+#define AP2MDM_ACK2	TEGRA_GPIO_PE2
+#define MDM2AP_ACK2	TEGRA_GPIO_PV0
+
+static int ph450_reset(void);
+static int ph450_handshake(void);
+
+static struct tegra_ulpi_trimmer e1219_trimmer = { 10, 1, 1, 1 };
+
+static struct tegra_ulpi_config ehci2_null_ulpi_phy_config = {
+	.trimmer = &e1219_trimmer,
+	.preinit = ph450_reset,
+	.postinit = ph450_handshake,
+};
+
+static struct tegra_ehci_platform_data ehci2_null_ulpi_platform_data = {
+	.operating_mode = TEGRA_USB_HOST,
+	.power_down_on_bus_suspend = 0,
+	.phy_config = &ehci2_null_ulpi_phy_config,
+	.phy_type = TEGRA_USB_PHY_TYPE_NULL_ULPI,
+};
+
+static int __init tegra_null_ulpi_init(void)
+{
+	tegra_ehci2_device.dev.platform_data = &ehci2_null_ulpi_platform_data;
+	platform_device_register(&tegra_ehci2_device);
+	return 0;
+}
+
+static int __init ph450_init(void)
+{
+	int ret;
+
+	ret = gpio_request(MODEM_PWR_ON, "mdm_power");
+	if (ret)
+		return ret;
+
+	ret = gpio_request(MODEM_RESET, "mdm_reset");
+	if (ret) {
+		gpio_free(MODEM_PWR_ON);
+		return ret;
+	}
+	ret = gpio_request(AP2MDM_ACK2, "ap2mdm_ack2");
+	if (ret) {
+		gpio_free(MODEM_PWR_ON);
+		gpio_free(MODEM_RESET);
+		return ret;
+	}
+	ret = gpio_request(MDM2AP_ACK2, "mdm2ap_ack2");
+	if (ret) {
+		gpio_free(MODEM_PWR_ON);
+		gpio_free(MODEM_RESET);
+		gpio_free(AP2MDM_ACK2);
+		return ret;
+	}
+
+	/* enable pull-up for MDM2AP_ACK2 */
+	tegra_pinmux_set_pullupdown(TEGRA_PINGROUP_GPIO_PV0,
+				    TEGRA_PUPD_PULL_UP);
+
+	tegra_gpio_enable(MODEM_PWR_ON);
+	tegra_gpio_enable(MODEM_RESET);
+	tegra_gpio_enable(AP2MDM_ACK2);
+	tegra_gpio_enable(MDM2AP_ACK2);
+
+	gpio_direction_output(MODEM_PWR_ON, 0);
+	gpio_direction_output(MODEM_RESET, 0);
+	gpio_direction_output(AP2MDM_ACK2, 1);
+	gpio_direction_input(MDM2AP_ACK2);
+
+	return 0;
+}
+
+static int ph450_reset(void)
+{
+	int retry = 100; /* retry for 10 sec */
+
+	gpio_set_value(AP2MDM_ACK2, 1);
+	gpio_set_value(MODEM_PWR_ON, 0);
+	gpio_set_value(MODEM_RESET, 0);
+	mdelay(200);
+	gpio_set_value(MODEM_RESET, 1);
+	mdelay(30);
+	gpio_set_value(MODEM_PWR_ON, 1);
+
+	while (retry) {
+		/* wait for MDM2AP_ACK2 low */
+		int val = gpio_get_value(MDM2AP_ACK2);
+		if (!val) {
+			pr_info("MDM2AP_ACK2 detected\n");
+			return 0;
+		} else {
+			pr_info(".");
+			retry--;
+			mdelay(100);
+		}
+	}
+	return 1;
+}
+
+static int ph450_handshake(void)
+{
+	/* set AP2MDM_ACK2 low */
+	gpio_set_value(AP2MDM_ACK2, 0);
+
+	return 0;
+}
+
+int __init enterprise_baseband_init(void)
+{
+	int ret;
+
+	ret = ph450_init();
+	if (ret) {
+		pr_err("modem init failed\n");
+		return ret;
+	}
+
+	tegra_null_ulpi_init();
+	return 0;
+}