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/*
* arch/arm/mach-omap2/board-blaze-modem.c
*
* Copyright (C) 2011 Texas Instruments
*
* Author: Patrick Combes <p-combes@ti.com>
* Based on a patch from Cedric Baudelet
*
* 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/gpio.h>
#include <linux/delay.h>
#include "board-blaze.h"
#include "mux.h"
#include <plat/omap_hsi.h>
#if defined(CONFIG_USB_EHCI_HCD_OMAP) || defined(CONFIG_USB_OHCI_HCD_OMAP3)
#include <plat/usb.h>
#endif
#define BLAZE_MDM_ONSW 187
#define BLAZE_MDM_PWRSTATE 189
#define MODEM_PWRSTATE_POLLING_MS 10
#define MODEM_PWRSTATE_TIMEOUT (100 / MODEM_PWRSTATE_POLLING_MS)
static int modem_detected;
/*
* Switch-on or switch-off the modem and return modem status
* Pre-requisites:
* - Modem Vbat supplied with
* - BLAZE_MDM_ONSW and BLAZE_MDM_PWRSTATE gpio reserved and PAD configured
*/
static int blaze_modem_switch(int new_state)
{
int modem_pwrrst_ca;
int state;
int i;
/* Control Modem power switch */
gpio_direction_output(BLAZE_MDM_ONSW, new_state);
state = new_state ? 1 : 0;
/* Monitor Modem power state */
i = 0;
while (i < MODEM_PWRSTATE_TIMEOUT) {
modem_pwrrst_ca = gpio_get_value(BLAZE_MDM_PWRSTATE);
if (unlikely(new_state == modem_pwrrst_ca)) {
pr_info("Modem state properly updated to state %d\n",
state);
break;
}
msleep(MODEM_PWRSTATE_POLLING_MS);
i++;
}
return modem_pwrrst_ca;
}
static void blaze_hsi_pad_conf(void)
{
/*
* HSI pad conf: hsi1_ca/ac_wake/flag/data/ready
*/
/* hsi1_cawake */
omap_mux_init_signal("usbb1_ulpitll_clk.hsi1_cawake", \
OMAP_PIN_INPUT_PULLDOWN | \
OMAP_PIN_OFF_NONE | \
OMAP_PIN_OFF_WAKEUPENABLE);
/* hsi1_caflag */
omap_mux_init_signal("usbb1_ulpitll_dir.hsi1_caflag", \
OMAP_PIN_INPUT | \
OMAP_PIN_OFF_NONE);
/* hsi1_cadata */
omap_mux_init_signal("usbb1_ulpitll_stp.hsi1_cadata", \
OMAP_PIN_INPUT | \
OMAP_PIN_OFF_NONE);
/* hsi1_acready */
omap_mux_init_signal("usbb1_ulpitll_nxt.hsi1_acready", \
OMAP_PIN_OUTPUT | \
OMAP_PIN_OFF_OUTPUT_LOW);
/* hsi1_acwake */
omap_mux_init_signal("usbb1_ulpitll_dat0.hsi1_acwake", \
OMAP_PIN_OUTPUT | \
OMAP_PIN_OFF_NONE);
/* hsi1_acdata */
omap_mux_init_signal("usbb1_ulpitll_dat1.hsi1_acdata", \
OMAP_PIN_OUTPUT | \
OMAP_PIN_OFF_NONE);
/* hsi1_acflag */
omap_mux_init_signal("usbb1_ulpitll_dat2.hsi1_acflag", \
OMAP_PIN_OUTPUT | \
OMAP_PIN_OFF_NONE);
/* hsi1_caready */
omap_mux_init_signal("usbb1_ulpitll_dat3.hsi1_caready", \
OMAP_PIN_INPUT_PULLDOWN | \
OMAP_PIN_OFF_NONE);
}
static void blaze_modem_pad_conf(void)
{
pr_info("Update PAD for modem connection\n");
/* Configure PADconf for HSI */
blaze_hsi_pad_conf();
/* gpio_95 */
omap_mux_init_signal("usbb1_ulpitll_dat7.gpio_95", \
OMAP_PIN_INPUT_PULLDOWN | \
OMAP_PIN_OFF_NONE | \
OMAP_PIN_OFF_WAKEUPENABLE);
/* Ensure UART3 Tx will not drive until Modem is up and running */
omap_mux_init_signal("uart3_tx_irtx.uart3_tx_irtx", OMAP_MUX_MODE7);
/*mcbsp2_fsx*/
omap_mux_init_signal("abe_mcbsp2_fsx.abe_mcbsp2_fsx", \
OMAP_PIN_INPUT_PULLDOWN | \
OMAP_PIN_OFF_INPUT_PULLDOWN | \
OMAP_MUX_MODE0);
/*mcbsp2_clkx*/
omap_mux_init_signal("abe_mcbcp2_clkx.abe_mcbsp2_clkx", \
OMAP_PIN_INPUT_PULLDOWN | \
OMAP_PIN_OFF_INPUT_PULLDOWN | \
OMAP_MUX_MODE0);
/*mcbsp2_dr*/
omap_mux_init_signal("abe_mcbsp2_dr.abe_mcbsp2_dr", \
OMAP_PIN_INPUT_PULLDOWN | \
OMAP_PIN_OFF_OUTPUT_LOW | \
OMAP_MUX_MODE0);
}
/*
* Modem is tentatively switched ON to detect it then switched back to OFF
*
* As OMAP4 muxes HSI and USB signals, when HSI is used (for instance HSI
* modem is plugged) HSI pad conf is configured and some USB
* configurations are disabled.
*/
void __init blaze_modem_init(bool force_mux)
{
int modem_enabled;
/* Prepare MDM VBAT */
omap_mux_init_signal("usbb2_ulpitll_clk.gpio_157", \
OMAP_PIN_OUTPUT | \
OMAP_PIN_OFF_NONE);
/* Power on 3V3 Buck/Boost Power Supply for Modem */
if (unlikely(!gpio_is_valid(BLAZE_MDM_PWR_EN_GPIO) ||
gpio_request(BLAZE_MDM_PWR_EN_GPIO, "MODEM VBAT") < 0)) {
pr_err("Cannot control gpio %d\n", BLAZE_MDM_PWR_EN_GPIO);
goto err_pwr;
}
gpio_direction_output(BLAZE_MDM_PWR_EN_GPIO, 1);
/* Prepare MDM_STATE to get modem status */
omap_mux_init_signal("sys_boot5.gpio_189", \
OMAP_PIN_INPUT_PULLDOWN | \
OMAP_PIN_OFF_NONE);
if (unlikely(!gpio_is_valid(BLAZE_MDM_PWRSTATE) ||
gpio_request(BLAZE_MDM_PWRSTATE, "MODEM POWER STATE") < 0)) {
pr_err("Cannot control gpio %d\n", BLAZE_MDM_PWRSTATE);
goto err_pwrstate1;
}
gpio_direction_input(BLAZE_MDM_PWRSTATE);
if (unlikely(gpio_get_value(BLAZE_MDM_PWRSTATE))) {
pr_err("Invalid modem state\n");
goto err_pwrstate2;
}
/* Prepare MDM_ONSW to control modem state */
omap_mux_init_signal("sys_boot3.gpio_187", \
OMAP_PIN_OUTPUT | \
OMAP_PIN_OFF_NONE);
/* Enable Modem ONSW */
if (unlikely(!gpio_is_valid(BLAZE_MDM_ONSW) ||
gpio_request(BLAZE_MDM_ONSW, "MODEM SWITCH ON") < 0)) {
pr_err("Cannot control gpio %d\n", BLAZE_MDM_ONSW);
goto err_onsw;
}
modem_detected = blaze_modem_switch(1);
pr_info("Modem %sdetected\n", modem_detected ? "" : "NOT ");
/* Disable Modem ONSW */
modem_enabled = blaze_modem_switch(0);
if (unlikely(modem_detected && modem_enabled))
pr_err("Modem cannot be switched-off\n");
/* Release PWRSTATE and ONSW */
gpio_free(BLAZE_MDM_ONSW);
err_onsw:
err_pwrstate2:
gpio_free(BLAZE_MDM_PWRSTATE);
err_pwrstate1:
/* Configure omap4 pad for HSI if modem detected */
if (modem_detected || force_mux) {
#if defined(CONFIG_USB_EHCI_HCD_OMAP) || defined(CONFIG_USB_OHCI_HCD_OMAP3)
/* USBB1 I/O pads conflict with HSI1 port */
usbhs_bdata.port_mode[0] = OMAP_USBHS_PORT_MODE_UNUSED;
/* USBB2 I/O pads conflict with McBSP2 port */
usbhs_bdata.port_mode[1] = OMAP_USBHS_PORT_MODE_UNUSED;
#endif
/* Setup modem pad conf for blaze platform */
blaze_modem_pad_conf();
/* Allow HSI omap_device to be registered later */
omap_hsi_allow_registration();
} else {
gpio_direction_output(BLAZE_MDM_PWR_EN_GPIO, 0);
gpio_free(BLAZE_MDM_PWR_EN_GPIO);
}
err_pwr:
return;
}
#include "omap-rfkill-ste.h"
static struct omap_rfkill_ste_platform_data ste_pdata;
static struct platform_device modem_dev = {
.name = "ste-p5780",
.id = -1,
.dev.platform_data = &ste_pdata
};
static int late_blaze_modem_init(void)
{
int ret;
if (modem_detected) {
ret = platform_device_register(&modem_dev);
if (ret)
pr_err("Error registering modem dev: %d\n", ret);
}
return 0;
}
late_initcall(late_blaze_modem_init);
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