/*
* Copyright (C) 2007,2008 Freescale semiconductor, Inc.
*
* Author: Li Yang <LeoLi@freescale.com>
* Jerry Huang <Chang-Ming.Huang@freescale.com>
*
* Initialization based on code from Shlomi Gridish.
*
* 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.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/proc_fs.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/timer.h>
#include <linux/usb.h>
#include <linux/device.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/workqueue.h>
#include <linux/time.h>
#include <linux/fsl_devices.h>
#include <linux/platform_device.h>
#include <linux/uaccess.h>
#include <asm/unaligned.h>
#include "fsl_otg.h"
#define DRIVER_VERSION "Rev. 1.55"
#define DRIVER_AUTHOR "Jerry Huang/Li Yang"
#define DRIVER_DESC "Freescale USB OTG Transceiver Driver"
#define DRIVER_INFO DRIVER_DESC " " DRIVER_VERSION
static const char driver_name[] = "fsl-usb2-otg";
const pm_message_t otg_suspend_state = {
.event = 1,
};
#define HA_DATA_PULSE
static struct usb_dr_mmap *usb_dr_regs;
static struct fsl_otg *fsl_otg_dev;
static int srp_wait_done;
/* FSM timers */
struct fsl_otg_timer *a_wait_vrise_tmr, *a_wait_bcon_tmr, *a_aidl_bdis_tmr,
*b_ase0_brst_tmr, *b_se0_srp_tmr;
/* Driver specific timers */
struct fsl_otg_timer *b_data_pulse_tmr, *b_vbus_pulse_tmr, *b_srp_fail_tmr,
*b_srp_wait_tmr, *a_wait_enum_tmr;
static struct list_head active_timers;
static struct fsl_otg_config fsl_otg_initdata = {
.otg_port = 1,
};
#ifdef CONFIG_PPC32
static u32 _fsl_readl_be(const unsigned __iomem *p)
{
return in_be32(p);
}
static u32 _fsl_readl_le(const unsigned __iomem *p)
{
return in_le32(p);
}
static void _fsl_writel_be(u32 v, unsigned __iomem *p)
{
out_be32(p, v);
}
static void _fsl_writel_le(u32 v, unsigned __iomem *p)
{
out_le32(p, v);
}
static u32 (*_fsl_readl)(const unsigned __iomem *p);
static void (*_fsl_writel)(u32 v, unsigned __iomem *p);
#define fsl_readl(p) (*_fsl_readl)((p))
#define fsl_writel(v, p) (*_fsl_writel)((v), (p))
#else
#define fsl_readl(addr) readl(addr)
#define fsl_writel(val, addr) writel(val, addr)
#endif /* CONFIG_PPC32 */
/* Routines to access transceiver ULPI registers */
u8 view_ulpi(u8 addr)
{
u32 temp;
temp = 0x40000000 | (addr << 16);
fsl_writel(temp, &usb_dr_regs->ulpiview);
udelay(1000);
while (temp & 0x40)
temp = fsl_readl(&usb_dr_regs->ulpiview);
return (le32_to_cpu(temp) & 0x0000ff00) >> 8;
}
int write_ulpi(u8 addr, u8 data)
{
u32 temp;
temp = 0x60000000 | (addr << 16) | data;
fsl_writel(temp, &usb_dr_regs->ulpiview);
return 0;
}
/* -------------------------------------------------------------*/
/* Operations that will be called from OTG Finite State Machine */
/* Charge vbus for vbus pulsing in SRP */
void fsl_otg_chrg_vbus(int on)
{
u32 tmp;
tmp = fsl_readl(&usb_dr_regs->otgsc) & ~OTGSC_INTSTS_MASK;
if (on)
/* stop discharging, start charging */
tmp = (tmp & ~OTGSC_CTRL_VBUS_DISCHARGE) |
OTGSC_CTRL_VBUS_CHARGE;
else
/* stop charging */
tmp &= ~OTGSC_CTRL_VBUS_CHARGE;
fsl_writel(tmp, &usb_dr_regs->otgsc);
}
/* Discharge vbus through a resistor to ground */
void fsl_otg_dischrg_vbus(int on)
{
u32 tmp;
tmp = fsl_readl(&usb_dr_regs->otgsc) & ~OTGSC_INTSTS_MASK;
if (on)
/* stop charging, start discharging */
tmp = (tmp & ~OTGSC_CTRL_VBUS_CHARGE) |
OTGSC_CTRL_VBUS_DISCHARGE;
else
/* stop discharging */
tmp &= ~OTGSC_CTRL_VBUS_DISCHARGE;
fsl_writel(tmp, &usb_dr_regs->otgsc);
}
/* A-device driver vbus, controlled through PP bit in PORTSC */
void fsl_otg_drv_vbus(int on)
{
u32 tmp;
if (on) {
tmp = fsl_readl(&usb_dr_regs->portsc) & ~PORTSC_W1C_BITS;
fsl_writel(tmp | PORTSC_PORT_POWER, &usb_dr_regs->portsc);
} else {
tmp = fsl_readl(&usb_dr_regs->portsc) &
~PORTSC_W1C_BITS & ~PORTSC_PORT_POWER;
fsl_writel(tmp, &usb_dr_regs->portsc);
}
}
/*
* Pull-up D+, signalling connect by periperal. Also used in
* data-line pulsing in SRP
*/
void fsl_otg_loc_conn(int on)
{
u32 tmp;
tmp = fsl_readl(&usb_dr_regs->otgsc) & ~OTGSC_INTSTS_MASK;
if (on)
tmp |= OTGSC_CTRL_DATA_PULSING;
else
tmp &= ~OTGSC_CTRL_DATA_PULSING;
fsl_writel(tmp, &usb_dr_regs->otgsc);
}
/*
* Generate SOF by host. This is controlled through suspend/resume the
* port. In host mode, controller will automatically send SOF.
* Suspend will block the data on the port.
*/
void fsl_otg_loc_sof(int on)
{
u32 tmp;
tmp = fsl_readl(&fsl_otg_dev->dr_mem_map->portsc) & ~PORTSC_W1C_BITS;
if (on)
tmp |= PORTSC_PORT_FORCE_RESUME;
else
tmp |= PORTSC_PORT_SUSPEND;
fsl_writel(tmp, &fsl_otg_dev->dr_mem_map->portsc);
}
/* Start SRP pulsing by data-line pulsing, followed with v-bus pulsing. */
void fsl_otg_start_pulse(void)
{
u32 tmp;
srp_wait_done = 0;
#ifdef HA_DATA_PULSE
tmp = fsl_readl(&usb_dr_regs->otgsc) & ~OTGSC_INTSTS_MASK;
tmp |= OTGSC_HA_DATA_PULSE;
fsl_writel(tmp, &usb_dr_regs->otgsc);
#else
fsl_otg_loc_conn(1);
#endif
fsl_otg_add_timer(b_data_pulse_tmr);
}
void b_data_pulse_end(unsigned long foo)
{
#ifdef HA_DATA_PULSE
#else
fsl_otg_loc_conn(0);
#endif
/* Do VBUS pulse after data pulse */
fsl_otg_pulse_vbus();
}
void fsl_otg_pulse_vbus(void)
{
srp_wait_done = 0;
fsl_otg_chrg_vbus(1);
/* start the timer to end vbus charge */
fsl_otg_add_timer(b_vbus_pulse_tmr);
}
void b_vbus_pulse_end(unsigned long foo)
{
fsl_otg_chrg_vbus(0);
/*
* As USB3300 using the same a_sess_vld and b_sess_vld voltage
* we need to discharge the bus for a while to distinguish
* residual voltage of vbus pulsing and A device pull up
*/
fsl_otg_dischrg_vbus(1);
fsl_otg_add_timer(b_srp_wait_tmr);
}
void b_srp_end(unsigned long foo)
{
fsl_otg_dischrg_vbus(0);
srp_wait_done = 1;
if ((fsl_otg_dev->otg.state == OTG_STATE_B_SRP_INIT) &&
fsl_otg_dev->fsm.b_sess_vld)
fsl_otg_dev->fsm.b_srp_done = 1;
}
/*
* Workaround for a_host suspending too fast. When a_bus_req=0,
* a_host will start by SRP. It needs to set b_hnp_enable before
* actually suspending to start HNP
*/
void a_wait_enum(unsigned long foo)
{
VDBG("a_wait_enum timeout\n");
if (!fsl_otg_dev->otg.host->b_hnp_enable)
fsl_otg_add_timer(a_wait_enum_tmr);
else
otg_statemachine(&fsl_otg_dev->fsm);
}
/* The timeout callback function to set time out bit */
void set_tmout(unsigned long indicator)
{
*(int *)indicator = 1;
}
/* Initialize timers */
int fsl_otg_init_timers(struct otg_fsm *fsm)
{
/* FSM used timers */
a_wait_vrise_tmr = otg_timer_initializer(&set_tmout, TA_WAIT_VRISE,
(unsigned long)&fsm->a_wait_vrise_tmout);
if (!a_wait_vrise_tmr)
return -ENOMEM;
a_wait_bcon_tmr = otg_timer_initializer(&set_tmout, TA_WAIT_BCON,
(unsigned long)&fsm->a_wait_bcon_tmout);
if (!a_wait_bcon_tmr)
return -ENOMEM;
a_aidl_bdis_tmr = otg_timer_initializer(&set_tmout, TA_AIDL_BDIS,
(unsigned long)&fsm->a_aidl_bdis_tmout);
if (!a_aidl_bdis_tmr)
return -ENOMEM;
b_ase0_brst_tmr = otg_timer_initializer(&set_tmout, TB_ASE0_BRST,
(unsigned long)&fsm->b_ase0_brst_tmout);
if (!b_ase0_brst_tmr)
return -ENOMEM;
b_se0_srp_tmr = otg_timer_initializer(&set_tmout, TB_SE0_SRP,
(unsigned long)&fsm->b_se0_srp);
if (!b_se0_srp_tmr)
return -ENOMEM;
b_srp_fail_tmr = otg_timer_initializer(&set_tmout, TB_SRP_FAIL,
(unsigned long)&fsm->b_srp_done);
if (!b_srp_fail_tmr)
return -ENOMEM;
a_wait_enum_tmr = otg_timer_initializer(&a_wait_enum, 10,
(unsigned long)&fsm);
if (!a_wait_enum_tmr)
return -ENOMEM;
/* device driver used timers */
b_srp_wait_tmr = otg_timer_initializer(&b_srp_end, TB_SRP_WAIT, 0);
if (!b_srp_wait_tmr)
return -ENOMEM;
b_data_pulse_tmr = otg_timer_initializer(&b_data_pulse_end,
TB_DATA_PLS, 0);
if (!b_data_pulse_tmr)
return -ENOMEM;
b_vbus_pulse_tmr = otg_timer_initializer(&b_vbus_pulse_end,
TB_VBUS_PLS, 0);
if (!b_vbus_pulse_tmr)
return -ENOMEM;
return 0;
}
/* Uninitialize timers */
void fsl_otg_uninit_timers(void)
{
/* FSM used timers */
if (a_wait_vrise_tmr != NULL)
kfree(a_wait_vrise_tmr);
if (a_wait_bcon_tmr != NULL)
kfree(a_wait_bcon_tmr);
if (a_aidl_bdis_tmr != NULL)
kfree(a_aidl_bdis_tmr);
if (b_ase0_brst_tmr != NULL)
kfree(b_ase0_brst_tmr);
if (b_se0_srp_tmr != NULL)
kfree(b_se0_srp_tmr);
if (b_srp_fail_tmr != NULL)
kfree(b_srp_fail_tmr);
if (a_wait_enum_tmr != NULL)
kfree(a_wait_enum_tmr);
/* device driver used timers */
if (b_srp_wait_tmr != NULL)
kfree(b_srp_wait_tmr);
if (b_data_pulse_tmr != NULL)
kfree(b_data_pulse_tmr);
if (b_vbus_pulse_tmr != NULL)
kfree(b_vbus_pulse_tmr);
}
/* Add timer to timer list */
void fsl_otg_add_timer(void *gtimer)
{
struct fsl_otg_timer *timer = gtimer;
struct fsl_otg_timer *tmp_timer;
/*
* Check if the timer is already in the active list,
* if so update timer count
*/
list_for_each_entry(tmp_timer, &active_timers, list)
if (tmp_timer == timer) {
timer->count = timer->expires;
return;
}
timer->count = timer->expires;
list_add_tail(&timer->list, &active_timers);
}
/* Remove timer from the timer list; clear timeout status */
void fsl_otg_del_timer(void *gtimer)
{
struct fsl_otg_timer *timer = gtimer;
struct fsl_otg_timer *tmp_timer, *del_tmp;
list_for_each_entry_safe(tmp_timer, del_tmp, &active_timers, list)
if (tmp_timer == timer)
list_del(&timer->list);
}
/*
* Reduce timer count by 1, and find timeout conditions.
* Called by fsl_otg 1ms timer interrupt
*/
int fsl_otg_tick_timer(void)
{
struct fsl_otg_timer *tmp_timer, *del_tmp;
int expired = 0;
list_for_each_entry_safe(tmp_timer, del_tmp, &active_timers, list) {
tmp_timer->count--;
/* check if timer expires */
if (!tmp_timer->count) {
list_del(&tmp_timer->list);
tmp_timer->function(tmp_timer->data);
expired = 1;
}
}
return expired;
}
/* Reset controller, not reset the bus */
void otg_reset_controller(void)
{
u32 command;
command = fsl_readl(&usb_dr_regs->usbcmd);
command |= (1 << 1);
fsl_writel(command, &usb_dr_regs->usbcmd);
while (fsl_readl(&usb_dr_regs->usbcmd) & (1 << 1))
;
}
/* Call suspend/resume routines in host driver */
int fsl_otg_start_host(struct otg_fsm *fsm, int on)
{
struct otg_transceiver *xceiv = fsm->transceiver;
struct device *dev;
struct fsl_otg *otg_dev = container_of(xceiv, struct fsl_otg, otg);
u32 retval = 0;
if (!xceiv->host)
return -ENODEV;
dev = xceiv->host->controller;
/*
* Update a_vbus_vld state as a_vbus_vld int is disabled
* in device mode
*/
fsm->a_vbus_vld =
!!(fsl_readl(&usb_dr_regs->otgsc) & OTGSC_STS_A_VBUS_VALID);
if (on) {
/* start fsl usb host controller */
if (otg_dev->host_working)
goto end;
else {
otg_reset_controller();
VDBG("host on......\n");
if (dev->driver->pm && dev->driver->pm->resume) {
retval = dev->driver->pm->resume(dev);
if (fsm->id) {
/* default-b */
fsl_otg_drv_vbus(1);
/*
* Workaround: b_host can't driver
* vbus, but PP in PORTSC needs to
* be 1 for host to work.
* So we set drv_vbus bit in
* transceiver to 0 thru ULPI.
*/
write_ulpi(0x0c, 0x20);
}
}
otg_dev->host_working = 1;
}
} else {
/* stop fsl usb host controller */
if (!otg_dev->host_working)
goto end;
else {
VDBG("host off......\n");
if (dev && dev->driver) {
if (dev->driver->pm && dev->driver->pm->suspend)
retval = dev->driver->pm->suspend(dev);
if (fsm->id)
/* default-b */
fsl_otg_drv_vbus(0);
}
otg_dev->host_working = 0;
}
}
end:
return retval;
}
/*
* Call suspend and resume function in udc driver
* to stop and start udc driver.
*/
int fsl_otg_start_gadget(struct otg_fsm *fsm, int on)
{
struct otg_transceiver *xceiv = fsm->transceiver;
struct device *dev;
if (!xceiv->gadget || !xceiv->gadget->dev.parent)
return -ENODEV;
VDBG("gadget %s\n", on ? "on" : "off");
dev = xceiv->gadget->dev.parent;
if (on) {
if (dev->driver->resume)
dev->driver->resume(dev);
} else {
if (dev->driver->suspend)
dev->driver->suspend(dev, otg_suspend_state);
}
return 0;
}
/*
* Called by initialization code of host driver. Register host controller
* to the OTG. Suspend host for OTG role detection.
*/
static int fsl_otg_set_host(struct otg_transceiver *otg_p, struct usb_bus *host)
{
struct fsl_otg *otg_dev = container_of(otg_p, struct fsl_otg, otg);
if (!otg_p || otg_dev != fsl_otg_dev)
return -ENODEV;
otg_p->host = host;
otg_dev->fsm.a_bus_drop = 0;
otg_dev->fsm.a_bus_req = 1;
if (host) {
VDBG("host off......\n");
otg_p->host->otg_port = fsl_otg_initdata.otg_port;
otg_p->host->is_b_host = otg_dev->fsm.id;
/*
* must leave time for khubd to finish its thing
* before yanking the host driver out from under it,
* so suspend the host after a short delay.
*/
otg_dev->host_working = 1;
schedule_delayed_work(&otg_dev->otg_event, 100);
return 0;
} else {
/* host driver going away */
if (!(fsl_readl(&otg_dev->dr_mem_map->otgsc) &
OTGSC_STS_USB_ID)) {
/* Mini-A cable connected */
struct otg_fsm *fsm = &otg_dev->fsm;
otg_p->state = OTG_STATE_UNDEFINED;
fsm->protocol = PROTO_UNDEF;
}
}
otg_dev->host_working = 0;
otg_statemachine(&otg_dev->fsm);
return 0;
}
/* Called by initialization code of udc. Register udc to OTG. */
static int fsl_otg_set_peripheral(struct otg_transceiver *otg_p,
struct usb_gadget *gadget)
{
struct fsl_otg *otg_dev = container_of(otg_p, struct fsl_otg, otg);
VDBG("otg_dev 0x%x\n", (int)otg_dev);
VDBG("fsl_otg_dev 0x%x\n", (int)fsl_otg_dev);
if (!otg_p || otg_dev != fsl_otg_dev)
return -ENODEV;
if (!gadget) {
if (!otg_dev->otg.default_a)
otg_p->gadget->ops->vbus_draw(otg_p->gadget, 0);
usb_gadget_vbus_disconnect(otg_dev->otg.gadget);
otg_dev->otg.gadget = 0;
otg_dev->fsm.b_bus_req = 0;
otg_statemachine(&otg_dev->fsm);
return 0;
}
otg_p->gadget = gadget;
otg_p->gadget->is_a_peripheral = !otg_dev->fsm.id;
otg_dev->fsm.b_bus_req = 1;
/* start the gadget right away if the ID pin says Mini-B */
DBG("ID pin=%d\n", otg_dev->fsm.id);
if (otg_dev->fsm.id == 1) {
fsl_otg_start_host(&otg_dev->fsm, 0);
otg_drv_vbus(&otg_dev->fsm, 0);
fsl_otg_start_gadget(&otg_dev->fsm, 1);
}
return 0;
}
/* Set OTG port power, only for B-device */
static int fsl_otg_set_power(struct otg_transceiver *otg_p, unsigned mA)
{
if (!fsl_otg_dev)
return -ENODEV;
if (otg_p->state == OTG_STATE_B_PERIPHERAL)
pr_info("FSL OTG: Draw %d mA\n", mA);
return 0;
}
/*
* Delayed pin detect interrupt processing.
*
* When the Mini-A cable is disconnected from the board,
* the pin-detect interrupt happens before the disconnnect
* interrupts for the connected device(s). In order to
* process the disconnect interrupt(s) prior to switching
* roles, the pin-detect interrupts are delayed, and handled
* by this routine.
*/
static void fsl_otg_event(struct work_struct *work)
{
struct fsl_otg *og = container_of(work, struct fsl_otg, otg_event.work);
struct otg_fsm *fsm = &og->fsm;
if (fsm->id) { /* switch to gadget */
fsl_otg_start_host(fsm, 0);
otg_drv_vbus(fsm, 0);
fsl_otg_start_gadget(fsm, 1);
}
}
/* B-device start SRP */
static int fsl_otg_start_srp(struct otg_transceiver *otg_p)
{
struct fsl_otg *otg_dev = container_of(otg_p, struct fsl_otg, otg);
if (!otg_p || otg_dev != fsl_otg_dev
|| otg_p->state != OTG_STATE_B_IDLE)
return -ENODEV;
otg_dev->fsm.b_bus_req = 1;
otg_statemachine(&otg_dev->fsm);
return 0;
}
/* A_host suspend will call this function to start hnp */
static int fsl_otg_start_hnp(struct otg_transceiver *otg_p)
{
struct fsl_otg *otg_dev = container_of(otg_p, struct fsl_otg, otg);
if (!otg_p || otg_dev != fsl_otg_dev)
return -ENODEV;
DBG("start_hnp...n");
/* clear a_bus_req to enter a_suspend state */
otg_dev->fsm.a_bus_req = 0;
otg_statemachine(&otg_dev->fsm);
return 0;
}
/*
* Interrupt handler. OTG/host/peripheral share the same int line.
* OTG driver clears OTGSC interrupts and leaves USB interrupts
* intact. It needs to have knowledge of some USB interrupts
* such as port change.
*/
irqreturn_t fsl_otg_isr(int irq, void *dev_id)
{
struct otg_fsm *fsm = &((struct fsl_otg *)dev_id)->fsm;
struct otg_transceiver *otg = &((struct fsl_otg *)dev_id)->otg;
u32 otg_int_src, otg_sc;
otg_sc = fsl_readl(&usb_dr_regs->otgsc);
otg_int_src = otg_sc & OTGSC_INTSTS_MASK & (otg_sc >> 8);
/* Only clear otg interrupts */
fsl_writel(otg_sc, &usb_dr_regs->otgsc);
/*FIXME: ID change not generate when init to 0 */
fsm->id = (otg_sc & OTGSC_STS_USB_ID) ? 1 : 0;
otg->default_a = (fsm->id == 0);
/* process OTG interrupts */
if (otg_int_src) {
if (otg_int_src & OTGSC_INTSTS_USB_ID) {
fsm->id = (otg_sc & OTGSC_STS_USB_ID) ? 1 : 0;
otg->default_a = (fsm->id == 0);
/* clear conn information */
if (fsm->id)
fsm->b_conn = 0;
else
fsm->a_conn = 0;
if (otg->host)
otg->host->is_b_host = fsm->id;
if (otg->gadget)
otg->gadget->is_a_peripheral = !fsm->id;
VDBG("ID int (ID is %d)\n", fsm->id);
if (fsm->id) { /* switch to gadget */
schedule_delayed_work(
&((struct fsl_otg *)dev_id)->otg_event,
100);
} else { /* switch to host */
cancel_delayed_work(&
((struct fsl_otg *)dev_id)->
otg_event);
fsl_otg_start_gadget(fsm, 0);
otg_drv_vbus(fsm, 1);
fsl_otg_start_host(fsm, 1);
}
return IRQ_HANDLED;
}
}
return IRQ_NONE;
}
static struct otg_fsm_ops fsl_otg_ops = {
.chrg_vbus = fsl_otg_chrg_vbus,
.drv_vbus = fsl_otg_drv_vbus,
.loc_conn = fsl_otg_loc_conn,
.loc_sof = fsl_otg_loc_sof,
.start_pulse = fsl_otg_start_pulse,
.add_timer = fsl_otg_add_timer,
.del_timer = fsl_otg_del_timer,
.start_host = fsl_otg_start_host,
.start_gadget = fsl_otg_start_gadget,
};
/* Initialize the global variable fsl_otg_dev and request IRQ for OTG */
static int fsl_otg_conf(struct platform_device *pdev)
{
struct fsl_otg *fsl_otg_tc;
int status;
if (fsl_otg_dev)
return 0;
/* allocate space to fsl otg device */
fsl_otg_tc = kzalloc(sizeof(struct fsl_otg), GFP_KERNEL);
if (!fsl_otg_tc)
return -ENOMEM;
INIT_DELAYED_WORK(&fsl_otg_tc->otg_event, fsl_otg_event);
INIT_LIST_HEAD(&active_timers);
status = fsl_otg_init_timers(&fsl_otg_tc->fsm);
if (status) {
pr_info("Couldn't init OTG timers\n");
goto err;
}
spin_lock_init(&fsl_otg_tc->fsm.lock);
/* Set OTG state machine operations */
fsl_otg_tc->fsm.ops = &fsl_otg_ops;
/* initialize the otg structure */
fsl_otg_tc->otg.label = DRIVER_DESC;
fsl_otg_tc->otg.set_host = fsl_otg_set_host;
fsl_otg_tc->otg.set_peripheral = fsl_otg_set_peripheral;
fsl_otg_tc->otg.set_power = fsl_otg_set_power;
fsl_otg_tc->otg.start_hnp = fsl_otg_start_hnp;
fsl_otg_tc->otg.start_srp = fsl_otg_start_srp;
fsl_otg_dev = fsl_otg_tc;
/* Store the otg transceiver */
status = otg_set_transceiver(&fsl_otg_tc->otg);
if (status) {
pr_warn(FSL_OTG_NAME ": unable to register OTG transceiver.\n");
goto err;
}
return 0;
err:
fsl_otg_uninit_timers();
kfree(fsl_otg_tc);
return status;
}
/* OTG Initialization */
int usb_otg_start(struct platform_device *pdev)
{
struct fsl_otg *p_otg;
struct otg_transceiver *otg_trans = otg_get_transceiver();
struct otg_fsm *fsm;
int status;
struct resource *res;
u32 temp;
struct fsl_usb2_platform_data *pdata = pdev->dev.platform_data;
p_otg = container_of(otg_trans, struct fsl_otg, otg);
fsm = &p_otg->fsm;
/* Initialize the state machine structure with default values */
SET_OTG_STATE(otg_trans, OTG_STATE_UNDEFINED);
fsm->transceiver = &p_otg->otg;
/* We don't require predefined MEM/IRQ resource index */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENXIO;
/* We don't request_mem_region here to enable resource sharing
* with host/device */
usb_dr_regs = ioremap(res->start, sizeof(struct usb_dr_mmap));
p_otg->dr_mem_map = (struct usb_dr_mmap *)usb_dr_regs;
pdata->regs = (void *)usb_dr_regs;
if (pdata->init && pdata->init(pdev) != 0)
return -EINVAL;
if (pdata->big_endian_mmio) {
_fsl_readl = _fsl_readl_be;
_fsl_writel = _fsl_writel_be;
} else {
_fsl_readl = _fsl_readl_le;
_fsl_writel = _fsl_writel_le;
}
/* request irq */
p_otg->irq = platform_get_irq(pdev, 0);
status = request_irq(p_otg->irq, fsl_otg_isr,
IRQF_SHARED, driver_name, p_otg);
if (status) {
dev_dbg(p_otg->otg.dev, "can't get IRQ %d, error %d\n",
p_otg->irq, status);
iounmap(p_otg->dr_mem_map);
kfree(p_otg);
return status;
}
/* stop the controller */
temp = fsl_readl(&p_otg->dr_mem_map->usbcmd);
temp &= ~USB_CMD_RUN_STOP;
fsl_writel(temp, &p_otg->dr_mem_map->usbcmd);
/* reset the controller */
temp = fsl_readl(&p_otg->dr_mem_map->usbcmd);
temp |= USB_CMD_CTRL_RESET;
fsl_writel(temp, &p_otg->dr_mem_map->usbcmd);
/* wait reset completed */
while (fsl_readl(&p_otg->dr_mem_map->usbcmd) & USB_CMD_CTRL_RESET)
;
/* configure the VBUSHS as IDLE(both host and device) */
temp = USB_MODE_STREAM_DISABLE | (pdata->es ? USB_MODE_ES : 0);
fsl_writel(temp, &p_otg->dr_mem_map->usbmode);
/* configure PHY interface */
temp = fsl_readl(&p_otg->dr_mem_map->portsc);
temp &= ~(PORTSC_PHY_TYPE_SEL | PORTSC_PTW);
switch (pdata->phy_mode) {
case FSL_USB2_PHY_ULPI:
temp |= PORTSC_PTS_ULPI;
break;
case FSL_USB2_PHY_UTMI_WIDE:
temp |= PORTSC_PTW_16BIT;
/* fall through */
case FSL_USB2_PHY_UTMI:
temp |= PORTSC_PTS_UTMI;
/* fall through */
default:
break;
}
fsl_writel(temp, &p_otg->dr_mem_map->portsc);
if (pdata->have_sysif_regs) {
/* configure control enable IO output, big endian register */
temp = __raw_readl(&p_otg->dr_mem_map->control);
temp |= USB_CTRL_IOENB;
__raw_writel(temp, &p_otg->dr_mem_map->control);
}
/* disable all interrupt and clear all OTGSC status */
temp = fsl_readl(&p_otg->dr_mem_map->otgsc);
temp &= ~OTGSC_INTERRUPT_ENABLE_BITS_MASK;
temp |= OTGSC_INTERRUPT_STATUS_BITS_MASK | OTGSC_CTRL_VBUS_DISCHARGE;
fsl_writel(temp, &p_otg->dr_mem_map->otgsc);
/*
* The identification (id) input is FALSE when a Mini-A plug is inserted
* in the devices Mini-AB receptacle. Otherwise, this input is TRUE.
* Also: record initial state of ID pin
*/
if (fsl_readl(&p_otg->dr_mem_map->otgsc) & OTGSC_STS_USB_ID) {
p_otg->otg.state = OTG_STATE_UNDEFINED;
p_otg->fsm.id = 1;
} else {
p_otg->otg.state = OTG_STATE_A_IDLE;
p_otg->fsm.id = 0;
}
DBG("initial ID pin=%d\n", p_otg->fsm.id);
/* enable OTG ID pin interrupt */
temp = fsl_readl(&p_otg->dr_mem_map->otgsc);
temp |= OTGSC_INTR_USB_ID_EN;
temp &= ~(OTGSC_CTRL_VBUS_DISCHARGE | OTGSC_INTR_1MS_TIMER_EN);
fsl_writel(temp, &p_otg->dr_mem_map->otgsc);
return 0;
}
/*
* state file in sysfs
*/
static int show_fsl_usb2_otg_state(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct otg_fsm *fsm = &fsl_otg_dev->fsm;
char *next = buf;
unsigned size = PAGE_SIZE;
unsigned long flags;
int t;
spin_lock_irqsave(&fsm->lock, flags);
/* basic driver infomation */
t = scnprintf(next, size,
DRIVER_DESC "\n" "fsl_usb2_otg version: %s\n\n",
DRIVER_VERSION);
size -= t;
next += t;
/* Registers */
t = scnprintf(next, size,
"OTGSC: 0x%08x\n"
"PORTSC: 0x%08x\n"
"USBMODE: 0x%08x\n"
"USBCMD: 0x%08x\n"
"USBSTS: 0x%08x\n"
"USBINTR: 0x%08x\n",
fsl_readl(&usb_dr_regs->otgsc),
fsl_readl(&usb_dr_regs->portsc),
fsl_readl(&usb_dr_regs->usbmode),
fsl_readl(&usb_dr_regs->usbcmd),
fsl_readl(&usb_dr_regs->usbsts),
fsl_readl(&usb_dr_regs->usbintr));
size -= t;
next += t;
/* State */
t = scnprintf(next, size,
"OTG state: %s\n\n",
otg_state_string(fsl_otg_dev->otg.state));
size -= t;
next += t;
/* State Machine Variables */
t = scnprintf(next, size,
"a_bus_req: %d\n"
"b_bus_req: %d\n"
"a_bus_resume: %d\n"
"a_bus_suspend: %d\n"
"a_conn: %d\n"
"a_sess_vld: %d\n"
"a_srp_det: %d\n"
"a_vbus_vld: %d\n"
"b_bus_resume: %d\n"
"b_bus_suspend: %d\n"
"b_conn: %d\n"
"b_se0_srp: %d\n"
"b_sess_end: %d\n"
"b_sess_vld: %d\n"
"id: %d\n",
fsm->a_bus_req,
fsm->b_bus_req,
fsm->a_bus_resume,
fsm->a_bus_suspend,
fsm->a_conn,
fsm->a_sess_vld,
fsm->a_srp_det,
fsm->a_vbus_vld,
fsm->b_bus_resume,
fsm->b_bus_suspend,
fsm->b_conn,
fsm->b_se0_srp,
fsm->b_sess_end,
fsm->b_sess_vld,
fsm->id);
size -= t;
next += t;
spin_unlock_irqrestore(&fsm->lock, flags);
return PAGE_SIZE - size;
}
static DEVICE_ATTR(fsl_usb2_otg_state, S_IRUGO, show_fsl_usb2_otg_state, NULL);
/* Char driver interface to control some OTG input */
/*
* Handle some ioctl command, such as get otg
* status and set host suspend
*/
static long fsl_otg_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
u32 retval = 0;
switch (cmd) {
case GET_OTG_STATUS:
retval = fsl_otg_dev->host_working;
break;
case SET_A_SUSPEND_REQ:
fsl_otg_dev->fsm.a_suspend_req = arg;
break;
case SET_A_BUS_DROP:
fsl_otg_dev->fsm.a_bus_drop = arg;
break;
case SET_A_BUS_REQ:
fsl_otg_dev->fsm.a_bus_req = arg;
break;
case SET_B_BUS_REQ:
fsl_otg_dev->fsm.b_bus_req = arg;
break;
default:
break;
}
otg_statemachine(&fsl_otg_dev->fsm);
return retval;
}
static int fsl_otg_open(struct inode *inode, struct file *file)
{
return 0;
}
static int fsl_otg_release(struct inode *inode, struct file *file)
{
return 0;
}
static const struct file_operations otg_fops = {
.owner = THIS_MODULE,
.llseek = NULL,
.read = NULL,
.write = NULL,
.unlocked_ioctl = fsl_otg_ioctl,
.open = fsl_otg_open,
.release = fsl_otg_release,
};
static int __devinit fsl_otg_probe(struct platform_device *pdev)
{
int ret;
if (!pdev->dev.platform_data)
return -ENODEV;
/* configure the OTG */
ret = fsl_otg_conf(pdev);
if (ret) {
dev_err(&pdev->dev, "Couldn't configure OTG module\n");
return ret;
}
/* start OTG */
ret = usb_otg_start(pdev);
if (ret) {
dev_err(&pdev->dev, "Can't init FSL OTG device\n");
return ret;
}
ret = register_chrdev(FSL_OTG_MAJOR, FSL_OTG_NAME, &otg_fops);
if (ret) {
dev_err(&pdev->dev, "unable to register FSL OTG device\n");
return ret;
}
ret = device_create_file(&pdev->dev, &dev_attr_fsl_usb2_otg_state);
if (ret)
dev_warn(&pdev->dev, "Can't register sysfs attribute\n");
return ret;
}
static int __devexit fsl_otg_remove(struct platform_device *pdev)
{
struct fsl_usb2_platform_data *pdata = pdev->dev.platform_data;
otg_set_transceiver(NULL);
free_irq(fsl_otg_dev->irq, fsl_otg_dev);
iounmap((void *)usb_dr_regs);
fsl_otg_uninit_timers();
kfree(fsl_otg_dev);
device_remove_file(&pdev->dev, &dev_attr_fsl_usb2_otg_state);
unregister_chrdev(FSL_OTG_MAJOR, FSL_OTG_NAME);
if (pdata->exit)
pdata->exit(pdev);
return 0;
}
struct platform_driver fsl_otg_driver = {
.probe = fsl_otg_probe,
.remove = __devexit_p(fsl_otg_remove),
.driver = {
.name = driver_name,
.owner = THIS_MODULE,
},
};
static int __init fsl_usb_otg_init(void)
{
pr_info(DRIVER_INFO "\n");
return platform_driver_register(&fsl_otg_driver);
}
module_init(fsl_usb_otg_init);
static void __exit fsl_usb_otg_exit(void)
{
platform_driver_unregister(&fsl_otg_driver);
}
module_exit(fsl_usb_otg_exit);
MODULE_DESCRIPTION(DRIVER_INFO);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_LICENSE("GPL");
