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kernel-fxtec-pro1x/drivers/usb/otg/langwell_otg.c
Hao Wu 453f775588 USB: Add Intel Langwell USB OTG Transceiver Drive 
Description:
This driver is used for Intel Langwell* USB OTG controller in Intel
Moorestown* platform. It tries to implement host/device role switch
according to OTG spec.  The actual hsot and device functions are
accomplished in modified EHCI driver and Intel Langwell USB OTG client
controller driver.

* Langwell and Moorestown are names used in development. They are not
  approved official name.

Note:
This patch is the first version Intel Langwell USB OTG Transceiver
driver. The development is not finished, and the bug fixing is on going
for some hardware and software issues. The main purpose of this
submission is for code view.

Supported features:
- Data-line Pulsing SRP
- Support HNP to switch roles
- PCI D0/D3 power management support

Known issues:
- HNP is only tested with another Moorestown platform.
- PCI D0/D3 power management support is not fully tested.
- VBus Pulsing SRP is not support in current version.

Signed-off-by: Hao Wu <hao.wu@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:47 -07:00

1915 lines
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/*
* Intel Langwell USB OTG transceiver driver
* Copyright (C) 2008 - 2009, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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 St - Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
/* This driver helps to switch Langwell OTG controller function between host
* and peripheral. It works with EHCI driver and Langwell client controller
* driver together.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/moduleparam.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb.h>
#include <linux/usb/otg.h>
#include <linux/notifier.h>
#include <asm/ipc_defs.h>
#include <linux/delay.h>
#include "../core/hcd.h"
#include <linux/usb/langwell_otg.h>
#define DRIVER_DESC "Intel Langwell USB OTG transceiver driver"
#define DRIVER_VERSION "3.0.0.32L.0002"
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("Henry Yuan <hang.yuan@intel.com>, Hao Wu <hao.wu@intel.com>");
MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL");
static const char driver_name[] = "langwell_otg";
static int langwell_otg_probe(struct pci_dev *pdev,
const struct pci_device_id *id);
static void langwell_otg_remove(struct pci_dev *pdev);
static int langwell_otg_suspend(struct pci_dev *pdev, pm_message_t message);
static int langwell_otg_resume(struct pci_dev *pdev);
static int langwell_otg_set_host(struct otg_transceiver *otg,
struct usb_bus *host);
static int langwell_otg_set_peripheral(struct otg_transceiver *otg,
struct usb_gadget *gadget);
static int langwell_otg_start_srp(struct otg_transceiver *otg);
static const struct pci_device_id pci_ids[] = {{
.class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
.class_mask = ~0,
.vendor = 0x8086,
.device = 0x0811,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
}, { /* end: all zeroes */ }
};
static struct pci_driver otg_pci_driver = {
.name = (char *) driver_name,
.id_table = pci_ids,
.probe = langwell_otg_probe,
.remove = langwell_otg_remove,
.suspend = langwell_otg_suspend,
.resume = langwell_otg_resume,
};
static const char *state_string(enum usb_otg_state state)
{
switch (state) {
case OTG_STATE_A_IDLE:
return "a_idle";
case OTG_STATE_A_WAIT_VRISE:
return "a_wait_vrise";
case OTG_STATE_A_WAIT_BCON:
return "a_wait_bcon";
case OTG_STATE_A_HOST:
return "a_host";
case OTG_STATE_A_SUSPEND:
return "a_suspend";
case OTG_STATE_A_PERIPHERAL:
return "a_peripheral";
case OTG_STATE_A_WAIT_VFALL:
return "a_wait_vfall";
case OTG_STATE_A_VBUS_ERR:
return "a_vbus_err";
case OTG_STATE_B_IDLE:
return "b_idle";
case OTG_STATE_B_SRP_INIT:
return "b_srp_init";
case OTG_STATE_B_PERIPHERAL:
return "b_peripheral";
case OTG_STATE_B_WAIT_ACON:
return "b_wait_acon";
case OTG_STATE_B_HOST:
return "b_host";
default:
return "UNDEFINED";
}
}
/* HSM timers */
static inline struct langwell_otg_timer *otg_timer_initializer
(void (*function)(unsigned long), unsigned long expires, unsigned long data)
{
struct langwell_otg_timer *timer;
timer = kmalloc(sizeof(struct langwell_otg_timer), GFP_KERNEL);
timer->function = function;
timer->expires = expires;
timer->data = data;
return timer;
}
static struct langwell_otg_timer *a_wait_vrise_tmr, *a_wait_bcon_tmr,
*a_aidl_bdis_tmr, *b_ase0_brst_tmr, *b_se0_srp_tmr, *b_srp_res_tmr,
*b_bus_suspend_tmr;
static struct list_head active_timers;
static struct langwell_otg *the_transceiver;
/* host/client notify transceiver when event affects HNP state */
void langwell_update_transceiver()
{
otg_dbg("transceiver driver is notified\n");
queue_work(the_transceiver->qwork, &the_transceiver->work);
}
EXPORT_SYMBOL(langwell_update_transceiver);
static int langwell_otg_set_host(struct otg_transceiver *otg,
struct usb_bus *host)
{
otg->host = host;
return 0;
}
static int langwell_otg_set_peripheral(struct otg_transceiver *otg,
struct usb_gadget *gadget)
{
otg->gadget = gadget;
return 0;
}
static int langwell_otg_set_power(struct otg_transceiver *otg,
unsigned mA)
{
return 0;
}
/* A-device drives vbus, controlled through PMIC CHRGCNTL register*/
static void langwell_otg_drv_vbus(int on)
{
struct ipc_pmic_reg_data pmic_data = {0};
struct ipc_pmic_reg_data battery_data;
/* Check if battery is attached or not */
battery_data.pmic_reg_data[0].register_address = 0xd2;
battery_data.ioc = 0;
battery_data.num_entries = 1;
if (ipc_pmic_register_read(&battery_data)) {
otg_dbg("Failed to read PMIC register 0xd2.\n");
return;
}
if ((battery_data.pmic_reg_data[0].value & 0x20) == 0) {
otg_dbg("no battery attached\n");
return;
}
/* Workaround for battery attachment issue */
if (battery_data.pmic_reg_data[0].value == 0x34) {
otg_dbg("battery \n");
return;
}
otg_dbg("battery attached\n");
pmic_data.ioc = 0;
pmic_data.pmic_reg_data[0].register_address = 0xD4;
pmic_data.num_entries = 1;
if (on)
pmic_data.pmic_reg_data[0].value = 0x20;
else
pmic_data.pmic_reg_data[0].value = 0xc0;
if (ipc_pmic_register_write(&pmic_data, TRUE))
otg_dbg("Failed to write PMIC.\n");
}
/* charge vbus or discharge vbus through a resistor to ground */
static void langwell_otg_chrg_vbus(int on)
{
u32 val;
val = readl(the_transceiver->regs + CI_OTGSC);
if (on)
writel((val & ~OTGSC_INTSTS_MASK) | OTGSC_VC,
the_transceiver->regs + CI_OTGSC);
else
writel((val & ~OTGSC_INTSTS_MASK) | OTGSC_VD,
the_transceiver->regs + CI_OTGSC);
}
/* Start SRP */
static int langwell_otg_start_srp(struct otg_transceiver *otg)
{
u32 val;
otg_dbg("Start SRP ->\n");
val = readl(the_transceiver->regs + CI_OTGSC);
writel((val & ~OTGSC_INTSTS_MASK) | OTGSC_HADP,
the_transceiver->regs + CI_OTGSC);
/* Check if the data plus is finished or not */
msleep(8);
val = readl(the_transceiver->regs + CI_OTGSC);
if (val & (OTGSC_HADP | OTGSC_DP))
otg_dbg("DataLine SRP Error\n");
/* FIXME: VBus SRP */
return 0;
}
/* stop SOF via bus_suspend */
static void langwell_otg_loc_sof(int on)
{
struct usb_hcd *hcd;
int err;
otg_dbg("loc_sof -> %d\n", on);
hcd = bus_to_hcd(the_transceiver->otg.host);
if (on)
err = hcd->driver->bus_resume(hcd);
else
err = hcd->driver->bus_suspend(hcd);
if (err)
otg_dbg("Failed to resume/suspend bus - %d\n", err);
}
static void langwell_otg_phy_low_power(int on)
{
u32 val;
otg_dbg("phy low power mode-> %d\n", on);
val = readl(the_transceiver->regs + CI_HOSTPC1);
if (on)
writel(val | HOSTPC1_PHCD, the_transceiver->regs + CI_HOSTPC1);
else
writel(val & ~HOSTPC1_PHCD, the_transceiver->regs + CI_HOSTPC1);
}
/* Enable/Disable OTG interrupt */
static void langwell_otg_intr(int on)
{
u32 val;
otg_dbg("interrupt -> %d\n", on);
val = readl(the_transceiver->regs + CI_OTGSC);
if (on) {
val = val | (OTGSC_INTEN_MASK | OTGSC_IDPU);
writel(val, the_transceiver->regs + CI_OTGSC);
} else {
val = val & ~(OTGSC_INTEN_MASK | OTGSC_IDPU);
writel(val, the_transceiver->regs + CI_OTGSC);
}
}
/* set HAAR: Hardware Assist Auto-Reset */
static void langwell_otg_HAAR(int on)
{
u32 val;
otg_dbg("HAAR -> %d\n", on);
val = readl(the_transceiver->regs + CI_OTGSC);
if (on)
writel((val & ~OTGSC_INTSTS_MASK) | OTGSC_HAAR,
the_transceiver->regs + CI_OTGSC);
else
writel((val & ~OTGSC_INTSTS_MASK) & ~OTGSC_HAAR,
the_transceiver->regs + CI_OTGSC);
}
/* set HABA: Hardware Assist B-Disconnect to A-Connect */
static void langwell_otg_HABA(int on)
{
u32 val;
otg_dbg("HABA -> %d\n", on);
val = readl(the_transceiver->regs + CI_OTGSC);
if (on)
writel((val & ~OTGSC_INTSTS_MASK) | OTGSC_HABA,
the_transceiver->regs + CI_OTGSC);
else
writel((val & ~OTGSC_INTSTS_MASK) & ~OTGSC_HABA,
the_transceiver->regs + CI_OTGSC);
}
static int langwell_otg_check_se0_srp(int on)
{
u32 val;
int delay_time = TB_SE0_SRP * 10; /* step is 100us */
otg_dbg("check_se0_srp -> \n");
do {
udelay(100);
if (!delay_time--)
break;
val = readl(the_transceiver->regs + CI_PORTSC1);
val &= PORTSC_LS;
} while (!val);
otg_dbg("check_se0_srp <- \n");
return val;
}
/* The timeout callback function to set time out bit */
static void set_tmout(unsigned long indicator)
{
*(int *)indicator = 1;
}
void langwell_otg_nsf_msg(unsigned long indicator)
{
switch (indicator) {
case 2:
case 4:
case 6:
case 7:
printk(KERN_ERR "OTG:NSF-%lu - deivce not responding\n",
indicator);
break;
case 3:
printk(KERN_ERR "OTG:NSF-%lu - deivce not supported\n",
indicator);
break;
default:
printk(KERN_ERR "Do not have this kind of NSF\n");
break;
}
}
/* Initialize timers */
static void langwell_otg_init_timers(struct otg_hsm *hsm)
{
/* HSM used timers */
a_wait_vrise_tmr = otg_timer_initializer(&set_tmout, TA_WAIT_VRISE,
(unsigned long)&hsm->a_wait_vrise_tmout);
a_wait_bcon_tmr = otg_timer_initializer(&set_tmout, TA_WAIT_BCON,
(unsigned long)&hsm->a_wait_bcon_tmout);
a_aidl_bdis_tmr = otg_timer_initializer(&set_tmout, TA_AIDL_BDIS,
(unsigned long)&hsm->a_aidl_bdis_tmout);
b_ase0_brst_tmr = otg_timer_initializer(&set_tmout, TB_ASE0_BRST,
(unsigned long)&hsm->b_ase0_brst_tmout);
b_se0_srp_tmr = otg_timer_initializer(&set_tmout, TB_SE0_SRP,
(unsigned long)&hsm->b_se0_srp);
b_srp_res_tmr = otg_timer_initializer(&set_tmout, TB_SRP_RES,
(unsigned long)&hsm->b_srp_res_tmout);
b_bus_suspend_tmr = otg_timer_initializer(&set_tmout, TB_BUS_SUSPEND,
(unsigned long)&hsm->b_bus_suspend_tmout);
}
/* Free timers */
static void langwell_otg_free_timers(void)
{
kfree(a_wait_vrise_tmr);
kfree(a_wait_bcon_tmr);
kfree(a_aidl_bdis_tmr);
kfree(b_ase0_brst_tmr);
kfree(b_se0_srp_tmr);
kfree(b_srp_res_tmr);
kfree(b_bus_suspend_tmr);
}
/* Add timer to timer list */
static void langwell_otg_add_timer(void *gtimer)
{
struct langwell_otg_timer *timer = (struct langwell_otg_timer *)gtimer;
struct langwell_otg_timer *tmp_timer;
u32 val32;
/* 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;
if (list_empty(&active_timers)) {
val32 = readl(the_transceiver->regs + CI_OTGSC);
writel(val32 | OTGSC_1MSE, the_transceiver->regs + CI_OTGSC);
}
list_add_tail(&timer->list, &active_timers);
}
/* Remove timer from the timer list; clear timeout status */
static void langwell_otg_del_timer(void *gtimer)
{
struct langwell_otg_timer *timer = (struct langwell_otg_timer *)gtimer;
struct langwell_otg_timer *tmp_timer, *del_tmp;
u32 val32;
list_for_each_entry_safe(tmp_timer, del_tmp, &active_timers, list)
if (tmp_timer == timer)
list_del(&timer->list);
if (list_empty(&active_timers)) {
val32 = readl(the_transceiver->regs + CI_OTGSC);
writel(val32 & ~OTGSC_1MSE, the_transceiver->regs + CI_OTGSC);
}
}
/* Reduce timer count by 1, and find timeout conditions.*/
static int langwell_otg_tick_timer(u32 *int_sts)
{
struct langwell_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;
}
}
if (list_empty(&active_timers)) {
otg_dbg("tick timer: disable 1ms int\n");
*int_sts = *int_sts & ~OTGSC_1MSE;
}
return expired;
}
static void reset_otg(void)
{
u32 val;
int delay_time = 1000;
otg_dbg("reseting OTG controller ...\n");
val = readl(the_transceiver->regs + CI_USBCMD);
writel(val | USBCMD_RST, the_transceiver->regs + CI_USBCMD);
do {
udelay(100);
if (!delay_time--)
otg_dbg("reset timeout\n");
val = readl(the_transceiver->regs + CI_USBCMD);
val &= USBCMD_RST;
} while (val != 0);
otg_dbg("reset done.\n");
}
static void set_host_mode(void)
{
u32 val;
reset_otg();
val = readl(the_transceiver->regs + CI_USBMODE);
val = (val & (~USBMODE_CM)) | USBMODE_HOST;
writel(val, the_transceiver->regs + CI_USBMODE);
}
static void set_client_mode(void)
{
u32 val;
reset_otg();
val = readl(the_transceiver->regs + CI_USBMODE);
val = (val & (~USBMODE_CM)) | USBMODE_DEVICE;
writel(val, the_transceiver->regs + CI_USBMODE);
}
static void init_hsm(void)
{
struct langwell_otg *langwell = the_transceiver;
u32 val32;
/* read OTGSC after reset */
val32 = readl(langwell->regs + CI_OTGSC);
otg_dbg("%s: OTGSC init value = 0x%x\n", __func__, val32);
/* set init state */
if (val32 & OTGSC_ID) {
langwell->hsm.id = 1;
langwell->otg.default_a = 0;
set_client_mode();
langwell->otg.state = OTG_STATE_B_IDLE;
langwell_otg_drv_vbus(0);
} else {
langwell->hsm.id = 0;
langwell->otg.default_a = 1;
set_host_mode();
langwell->otg.state = OTG_STATE_A_IDLE;
}
/* set session indicator */
if (val32 & OTGSC_BSE)
langwell->hsm.b_sess_end = 1;
if (val32 & OTGSC_BSV)
langwell->hsm.b_sess_vld = 1;
if (val32 & OTGSC_ASV)
langwell->hsm.a_sess_vld = 1;
if (val32 & OTGSC_AVV)
langwell->hsm.a_vbus_vld = 1;
/* defautly power the bus */
langwell->hsm.a_bus_req = 1;
langwell->hsm.a_bus_drop = 0;
/* defautly don't request bus as B device */
langwell->hsm.b_bus_req = 0;
/* no system error */
langwell->hsm.a_clr_err = 0;
}
static irqreturn_t otg_dummy_irq(int irq, void *_dev)
{
void __iomem *reg_base = _dev;
u32 val;
u32 int_mask = 0;
val = readl(reg_base + CI_USBMODE);
if ((val & USBMODE_CM) != USBMODE_DEVICE)
return IRQ_NONE;
val = readl(reg_base + CI_USBSTS);
int_mask = val & INTR_DUMMY_MASK;
if (int_mask == 0)
return IRQ_NONE;
/* clear hsm.b_conn here since host driver can't detect it
* otg_dummy_irq called means B-disconnect happened.
*/
if (the_transceiver->hsm.b_conn) {
the_transceiver->hsm.b_conn = 0;
if (spin_trylock(&the_transceiver->wq_lock)) {
queue_work(the_transceiver->qwork,
&the_transceiver->work);
spin_unlock(&the_transceiver->wq_lock);
}
}
/* Clear interrupts */
writel(int_mask, reg_base + CI_USBSTS);
return IRQ_HANDLED;
}
static irqreturn_t otg_irq(int irq, void *_dev)
{
struct langwell_otg *langwell = _dev;
u32 int_sts, int_en;
u32 int_mask = 0;
int flag = 0;
int_sts = readl(langwell->regs + CI_OTGSC);
int_en = (int_sts & OTGSC_INTEN_MASK) >> 8;
int_mask = int_sts & int_en;
if (int_mask == 0)
return IRQ_NONE;
if (int_mask & OTGSC_IDIS) {
otg_dbg("%s: id change int\n", __func__);
langwell->hsm.id = (int_sts & OTGSC_ID) ? 1 : 0;
flag = 1;
}
if (int_mask & OTGSC_DPIS) {
otg_dbg("%s: data pulse int\n", __func__);
langwell->hsm.a_srp_det = (int_sts & OTGSC_DPS) ? 1 : 0;
flag = 1;
}
if (int_mask & OTGSC_BSEIS) {
otg_dbg("%s: b session end int\n", __func__);
langwell->hsm.b_sess_end = (int_sts & OTGSC_BSE) ? 1 : 0;
flag = 1;
}
if (int_mask & OTGSC_BSVIS) {
otg_dbg("%s: b session valid int\n", __func__);
langwell->hsm.b_sess_vld = (int_sts & OTGSC_BSV) ? 1 : 0;
flag = 1;
}
if (int_mask & OTGSC_ASVIS) {
otg_dbg("%s: a session valid int\n", __func__);
langwell->hsm.a_sess_vld = (int_sts & OTGSC_ASV) ? 1 : 0;
flag = 1;
}
if (int_mask & OTGSC_AVVIS) {
otg_dbg("%s: a vbus valid int\n", __func__);
langwell->hsm.a_vbus_vld = (int_sts & OTGSC_AVV) ? 1 : 0;
flag = 1;
}
if (int_mask & OTGSC_1MSS) {
/* need to schedule otg_work if any timer is expired */
if (langwell_otg_tick_timer(&int_sts))
flag = 1;
}
writel((int_sts & ~OTGSC_INTSTS_MASK) | int_mask,
langwell->regs + CI_OTGSC);
if (flag)
queue_work(langwell->qwork, &langwell->work);
return IRQ_HANDLED;
}
static void langwell_otg_work(struct work_struct *work)
{
struct langwell_otg *langwell = container_of(work,
struct langwell_otg, work);
int retval;
otg_dbg("%s: old state = %s\n", __func__,
state_string(langwell->otg.state));
switch (langwell->otg.state) {
case OTG_STATE_UNDEFINED:
case OTG_STATE_B_IDLE:
if (!langwell->hsm.id) {
langwell_otg_del_timer(b_srp_res_tmr);
langwell->otg.default_a = 1;
langwell->hsm.a_srp_det = 0;
langwell_otg_chrg_vbus(0);
langwell_otg_drv_vbus(0);
set_host_mode();
langwell->otg.state = OTG_STATE_A_IDLE;
queue_work(langwell->qwork, &langwell->work);
} else if (langwell->hsm.b_srp_res_tmout) {
langwell->hsm.b_srp_res_tmout = 0;
langwell->hsm.b_bus_req = 0;
langwell_otg_nsf_msg(6);
} else if (langwell->hsm.b_sess_vld) {
langwell_otg_del_timer(b_srp_res_tmr);
langwell->hsm.b_sess_end = 0;
langwell->hsm.a_bus_suspend = 0;
langwell_otg_chrg_vbus(0);
if (langwell->client_ops) {
langwell->client_ops->resume(langwell->pdev);
langwell->otg.state = OTG_STATE_B_PERIPHERAL;
} else
otg_dbg("client driver not loaded.\n");
} else if (langwell->hsm.b_bus_req &&
(langwell->hsm.b_sess_end)) {
/* workaround for b_se0_srp detection */
retval = langwell_otg_check_se0_srp(0);
if (retval) {
langwell->hsm.b_bus_req = 0;
otg_dbg("LS is not SE0, try again later\n");
} else {
/* Start SRP */
langwell_otg_start_srp(&langwell->otg);
langwell_otg_add_timer(b_srp_res_tmr);
}
}
break;
case OTG_STATE_B_SRP_INIT:
if (!langwell->hsm.id) {
langwell->otg.default_a = 1;
langwell->hsm.a_srp_det = 0;
langwell_otg_drv_vbus(0);
langwell_otg_chrg_vbus(0);
langwell->otg.state = OTG_STATE_A_IDLE;
queue_work(langwell->qwork, &langwell->work);
} else if (langwell->hsm.b_sess_vld) {
langwell_otg_chrg_vbus(0);
if (langwell->client_ops) {
langwell->client_ops->resume(langwell->pdev);
langwell->otg.state = OTG_STATE_B_PERIPHERAL;
} else
otg_dbg("client driver not loaded.\n");
}
break;
case OTG_STATE_B_PERIPHERAL:
if (!langwell->hsm.id) {
langwell->otg.default_a = 1;
langwell->hsm.a_srp_det = 0;
langwell_otg_drv_vbus(0);
langwell_otg_chrg_vbus(0);
set_host_mode();
if (langwell->client_ops) {
langwell->client_ops->suspend(langwell->pdev,
PMSG_FREEZE);
} else
otg_dbg("client driver has been removed.\n");
langwell->otg.state = OTG_STATE_A_IDLE;
queue_work(langwell->qwork, &langwell->work);
} else if (!langwell->hsm.b_sess_vld) {
langwell->hsm.b_hnp_enable = 0;
if (langwell->client_ops) {
langwell->client_ops->suspend(langwell->pdev,
PMSG_FREEZE);
} else
otg_dbg("client driver has been removed.\n");
langwell->otg.state = OTG_STATE_B_IDLE;
} else if (langwell->hsm.b_bus_req && langwell->hsm.b_hnp_enable
&& langwell->hsm.a_bus_suspend) {
if (langwell->client_ops) {
langwell->client_ops->suspend(langwell->pdev,
PMSG_FREEZE);
} else
otg_dbg("client driver has been removed.\n");
langwell_otg_HAAR(1);
langwell->hsm.a_conn = 0;
if (langwell->host_ops) {
langwell->host_ops->probe(langwell->pdev,
langwell->host_ops->id_table);
langwell->otg.state = OTG_STATE_B_WAIT_ACON;
} else
otg_dbg("host driver not loaded.\n");
langwell->hsm.a_bus_resume = 0;
langwell->hsm.b_ase0_brst_tmout = 0;
langwell_otg_add_timer(b_ase0_brst_tmr);
}
break;
case OTG_STATE_B_WAIT_ACON:
if (!langwell->hsm.id) {
langwell_otg_del_timer(b_ase0_brst_tmr);
langwell->otg.default_a = 1;
langwell->hsm.a_srp_det = 0;
langwell_otg_drv_vbus(0);
langwell_otg_chrg_vbus(0);
set_host_mode();
langwell_otg_HAAR(0);
if (langwell->host_ops)
langwell->host_ops->remove(langwell->pdev);
else
otg_dbg("host driver has been removed.\n");
langwell->otg.state = OTG_STATE_A_IDLE;
queue_work(langwell->qwork, &langwell->work);
} else if (!langwell->hsm.b_sess_vld) {
langwell_otg_del_timer(b_ase0_brst_tmr);
langwell->hsm.b_hnp_enable = 0;
langwell->hsm.b_bus_req = 0;
langwell_otg_chrg_vbus(0);
langwell_otg_HAAR(0);
if (langwell->host_ops)
langwell->host_ops->remove(langwell->pdev);
else
otg_dbg("host driver has been removed.\n");
langwell->otg.state = OTG_STATE_B_IDLE;
} else if (langwell->hsm.a_conn) {
langwell_otg_del_timer(b_ase0_brst_tmr);
langwell_otg_HAAR(0);
langwell->otg.state = OTG_STATE_B_HOST;
queue_work(langwell->qwork, &langwell->work);
} else if (langwell->hsm.a_bus_resume ||
langwell->hsm.b_ase0_brst_tmout) {
langwell_otg_del_timer(b_ase0_brst_tmr);
langwell_otg_HAAR(0);
langwell_otg_nsf_msg(7);
if (langwell->host_ops)
langwell->host_ops->remove(langwell->pdev);
else
otg_dbg("host driver has been removed.\n");
langwell->hsm.a_bus_suspend = 0;
langwell->hsm.b_bus_req = 0;
if (langwell->client_ops)
langwell->client_ops->resume(langwell->pdev);
else
otg_dbg("client driver not loaded.\n");
langwell->otg.state = OTG_STATE_B_PERIPHERAL;
}
break;
case OTG_STATE_B_HOST:
if (!langwell->hsm.id) {
langwell->otg.default_a = 1;
langwell->hsm.a_srp_det = 0;
langwell_otg_drv_vbus(0);
langwell_otg_chrg_vbus(0);
set_host_mode();
if (langwell->host_ops)
langwell->host_ops->remove(langwell->pdev);
else
otg_dbg("host driver has been removed.\n");
langwell->otg.state = OTG_STATE_A_IDLE;
queue_work(langwell->qwork, &langwell->work);
} else if (!langwell->hsm.b_sess_vld) {
langwell->hsm.b_hnp_enable = 0;
langwell->hsm.b_bus_req = 0;
langwell_otg_chrg_vbus(0);
if (langwell->host_ops)
langwell->host_ops->remove(langwell->pdev);
else
otg_dbg("host driver has been removed.\n");
langwell->otg.state = OTG_STATE_B_IDLE;
} else if ((!langwell->hsm.b_bus_req) ||
(!langwell->hsm.a_conn)) {
langwell->hsm.b_bus_req = 0;
langwell_otg_loc_sof(0);
if (langwell->host_ops)
langwell->host_ops->remove(langwell->pdev);
else
otg_dbg("host driver has been removed.\n");
langwell->hsm.a_bus_suspend = 0;
if (langwell->client_ops)
langwell->client_ops->resume(langwell->pdev);
else
otg_dbg("client driver not loaded.\n");
langwell->otg.state = OTG_STATE_B_PERIPHERAL;
}
break;
case OTG_STATE_A_IDLE:
langwell->otg.default_a = 1;
if (langwell->hsm.id) {
langwell->otg.default_a = 0;
langwell->hsm.b_bus_req = 0;
langwell_otg_drv_vbus(0);
langwell_otg_chrg_vbus(0);
langwell->otg.state = OTG_STATE_B_IDLE;
queue_work(langwell->qwork, &langwell->work);
} else if (langwell->hsm.a_sess_vld) {
langwell_otg_drv_vbus(1);
langwell->hsm.a_srp_det = 1;
langwell->hsm.a_wait_vrise_tmout = 0;
langwell_otg_add_timer(a_wait_vrise_tmr);
langwell->otg.state = OTG_STATE_A_WAIT_VRISE;
queue_work(langwell->qwork, &langwell->work);
} else if (!langwell->hsm.a_bus_drop &&
(langwell->hsm.a_srp_det || langwell->hsm.a_bus_req)) {
langwell_otg_drv_vbus(1);
langwell->hsm.a_wait_vrise_tmout = 0;
langwell_otg_add_timer(a_wait_vrise_tmr);
langwell->otg.state = OTG_STATE_A_WAIT_VRISE;
queue_work(langwell->qwork, &langwell->work);
}
break;
case OTG_STATE_A_WAIT_VRISE:
if (langwell->hsm.id) {
langwell_otg_del_timer(a_wait_vrise_tmr);
langwell->hsm.b_bus_req = 0;
langwell->otg.default_a = 0;
langwell_otg_drv_vbus(0);
langwell->otg.state = OTG_STATE_B_IDLE;
} else if (langwell->hsm.a_vbus_vld) {
langwell_otg_del_timer(a_wait_vrise_tmr);
if (langwell->host_ops)
langwell->host_ops->probe(langwell->pdev,
langwell->host_ops->id_table);
else
otg_dbg("host driver not loaded.\n");
langwell->hsm.b_conn = 0;
langwell->hsm.a_set_b_hnp_en = 0;
langwell->hsm.a_wait_bcon_tmout = 0;
langwell_otg_add_timer(a_wait_bcon_tmr);
langwell->otg.state = OTG_STATE_A_WAIT_BCON;
} else if (langwell->hsm.a_wait_vrise_tmout) {
if (langwell->hsm.a_vbus_vld) {
if (langwell->host_ops)
langwell->host_ops->probe(
langwell->pdev,
langwell->host_ops->id_table);
else
otg_dbg("host driver not loaded.\n");
langwell->hsm.b_conn = 0;
langwell->hsm.a_set_b_hnp_en = 0;
langwell->hsm.a_wait_bcon_tmout = 0;
langwell_otg_add_timer(a_wait_bcon_tmr);
langwell->otg.state = OTG_STATE_A_WAIT_BCON;
} else {
langwell_otg_drv_vbus(0);
langwell->otg.state = OTG_STATE_A_VBUS_ERR;
}
}
break;
case OTG_STATE_A_WAIT_BCON:
if (langwell->hsm.id) {
langwell_otg_del_timer(a_wait_bcon_tmr);
langwell->otg.default_a = 0;
langwell->hsm.b_bus_req = 0;
if (langwell->host_ops)
langwell->host_ops->remove(langwell->pdev);
else
otg_dbg("host driver has been removed.\n");
langwell_otg_drv_vbus(0);
langwell->otg.state = OTG_STATE_B_IDLE;
queue_work(langwell->qwork, &langwell->work);
} else if (!langwell->hsm.a_vbus_vld) {
langwell_otg_del_timer(a_wait_bcon_tmr);
if (langwell->host_ops)
langwell->host_ops->remove(langwell->pdev);
else
otg_dbg("host driver has been removed.\n");
langwell_otg_drv_vbus(0);
langwell->otg.state = OTG_STATE_A_VBUS_ERR;
} else if (langwell->hsm.a_bus_drop ||
(langwell->hsm.a_wait_bcon_tmout &&
!langwell->hsm.a_bus_req)) {
langwell_otg_del_timer(a_wait_bcon_tmr);
if (langwell->host_ops)
langwell->host_ops->remove(langwell->pdev);
else
otg_dbg("host driver has been removed.\n");
langwell_otg_drv_vbus(0);
langwell->otg.state = OTG_STATE_A_WAIT_VFALL;
} else if (langwell->hsm.b_conn) {
langwell_otg_del_timer(a_wait_bcon_tmr);
langwell->hsm.a_suspend_req = 0;
langwell->otg.state = OTG_STATE_A_HOST;
if (!langwell->hsm.a_bus_req &&
langwell->hsm.a_set_b_hnp_en) {
/* It is not safe enough to do a fast
* transistion from A_WAIT_BCON to
* A_SUSPEND */
msleep(10000);
if (langwell->hsm.a_bus_req)
break;
if (request_irq(langwell->pdev->irq,
otg_dummy_irq, IRQF_SHARED,
driver_name, langwell->regs) != 0) {
otg_dbg("request interrupt %d fail\n",
langwell->pdev->irq);
}
langwell_otg_HABA(1);
langwell->hsm.b_bus_resume = 0;
langwell->hsm.a_aidl_bdis_tmout = 0;
langwell_otg_add_timer(a_aidl_bdis_tmr);
langwell_otg_loc_sof(0);
langwell->otg.state = OTG_STATE_A_SUSPEND;
} else if (!langwell->hsm.a_bus_req &&
!langwell->hsm.a_set_b_hnp_en) {
struct pci_dev *pdev = langwell->pdev;
if (langwell->host_ops)
langwell->host_ops->remove(pdev);
else
otg_dbg("host driver removed.\n");
langwell_otg_drv_vbus(0);
langwell->otg.state = OTG_STATE_A_WAIT_VFALL;
}
}
break;
case OTG_STATE_A_HOST:
if (langwell->hsm.id) {
langwell->otg.default_a = 0;
langwell->hsm.b_bus_req = 0;
if (langwell->host_ops)
langwell->host_ops->remove(langwell->pdev);
else
otg_dbg("host driver has been removed.\n");
langwell_otg_drv_vbus(0);
langwell->otg.state = OTG_STATE_B_IDLE;
queue_work(langwell->qwork, &langwell->work);
} else if (langwell->hsm.a_bus_drop ||
(!langwell->hsm.a_set_b_hnp_en && !langwell->hsm.a_bus_req)) {
if (langwell->host_ops)
langwell->host_ops->remove(langwell->pdev);
else
otg_dbg("host driver has been removed.\n");
langwell_otg_drv_vbus(0);
langwell->otg.state = OTG_STATE_A_WAIT_VFALL;
} else if (!langwell->hsm.a_vbus_vld) {
if (langwell->host_ops)
langwell->host_ops->remove(langwell->pdev);
else
otg_dbg("host driver has been removed.\n");
langwell_otg_drv_vbus(0);
langwell->otg.state = OTG_STATE_A_VBUS_ERR;
} else if (langwell->hsm.a_set_b_hnp_en
&& !langwell->hsm.a_bus_req) {
/* Set HABA to enable hardware assistance to signal
* A-connect after receiver B-disconnect. Hardware
* will then set client mode and enable URE, SLE and
* PCE after the assistance. otg_dummy_irq is used to
* clean these ints when client driver is not resumed.
*/
if (request_irq(langwell->pdev->irq,
otg_dummy_irq, IRQF_SHARED, driver_name,
langwell->regs) != 0) {
otg_dbg("request interrupt %d failed\n",
langwell->pdev->irq);
}
/* set HABA */
langwell_otg_HABA(1);
langwell->hsm.b_bus_resume = 0;
langwell->hsm.a_aidl_bdis_tmout = 0;
langwell_otg_add_timer(a_aidl_bdis_tmr);
langwell_otg_loc_sof(0);
langwell->otg.state = OTG_STATE_A_SUSPEND;
} else if (!langwell->hsm.b_conn || !langwell->hsm.a_bus_req) {
langwell->hsm.a_wait_bcon_tmout = 0;
langwell->hsm.a_set_b_hnp_en = 0;
langwell_otg_add_timer(a_wait_bcon_tmr);
langwell->otg.state = OTG_STATE_A_WAIT_BCON;
}
break;
case OTG_STATE_A_SUSPEND:
if (langwell->hsm.id) {
langwell_otg_del_timer(a_aidl_bdis_tmr);
langwell_otg_HABA(0);
free_irq(langwell->pdev->irq, langwell->regs);
langwell->otg.default_a = 0;
langwell->hsm.b_bus_req = 0;
if (langwell->host_ops)
langwell->host_ops->remove(langwell->pdev);
else
otg_dbg("host driver has been removed.\n");
langwell_otg_drv_vbus(0);
langwell->otg.state = OTG_STATE_B_IDLE;
queue_work(langwell->qwork, &langwell->work);
} else if (langwell->hsm.a_bus_req ||
langwell->hsm.b_bus_resume) {
langwell_otg_del_timer(a_aidl_bdis_tmr);
langwell_otg_HABA(0);
free_irq(langwell->pdev->irq, langwell->regs);
langwell->hsm.a_suspend_req = 0;
langwell_otg_loc_sof(1);
langwell->otg.state = OTG_STATE_A_HOST;
} else if (langwell->hsm.a_aidl_bdis_tmout ||
langwell->hsm.a_bus_drop) {
langwell_otg_del_timer(a_aidl_bdis_tmr);
langwell_otg_HABA(0);
free_irq(langwell->pdev->irq, langwell->regs);
if (langwell->host_ops)
langwell->host_ops->remove(langwell->pdev);
else
otg_dbg("host driver has been removed.\n");
langwell_otg_drv_vbus(0);
langwell->otg.state = OTG_STATE_A_WAIT_VFALL;
} else if (!langwell->hsm.b_conn &&
langwell->hsm.a_set_b_hnp_en) {
langwell_otg_del_timer(a_aidl_bdis_tmr);
langwell_otg_HABA(0);
free_irq(langwell->pdev->irq, langwell->regs);
if (langwell->host_ops)
langwell->host_ops->remove(langwell->pdev);
else
otg_dbg("host driver has been removed.\n");
langwell->hsm.b_bus_suspend = 0;
langwell->hsm.b_bus_suspend_vld = 0;
langwell->hsm.b_bus_suspend_tmout = 0;
/* msleep(200); */
if (langwell->client_ops)
langwell->client_ops->resume(langwell->pdev);
else
otg_dbg("client driver not loaded.\n");
langwell_otg_add_timer(b_bus_suspend_tmr);
langwell->otg.state = OTG_STATE_A_PERIPHERAL;
break;
} else if (!langwell->hsm.a_vbus_vld) {
langwell_otg_del_timer(a_aidl_bdis_tmr);
langwell_otg_HABA(0);
free_irq(langwell->pdev->irq, langwell->regs);
if (langwell->host_ops)
langwell->host_ops->remove(langwell->pdev);
else
otg_dbg("host driver has been removed.\n");
langwell_otg_drv_vbus(0);
langwell->otg.state = OTG_STATE_A_VBUS_ERR;
}
break;
case OTG_STATE_A_PERIPHERAL:
if (langwell->hsm.id) {
langwell_otg_del_timer(b_bus_suspend_tmr);
langwell->otg.default_a = 0;
langwell->hsm.b_bus_req = 0;
if (langwell->client_ops)
langwell->client_ops->suspend(langwell->pdev,
PMSG_FREEZE);
else
otg_dbg("client driver has been removed.\n");
langwell_otg_drv_vbus(0);
langwell->otg.state = OTG_STATE_B_IDLE;
queue_work(langwell->qwork, &langwell->work);
} else if (!langwell->hsm.a_vbus_vld) {
langwell_otg_del_timer(b_bus_suspend_tmr);
if (langwell->client_ops)
langwell->client_ops->suspend(langwell->pdev,
PMSG_FREEZE);
else
otg_dbg("client driver has been removed.\n");
langwell_otg_drv_vbus(0);
langwell->otg.state = OTG_STATE_A_VBUS_ERR;
} else if (langwell->hsm.a_bus_drop) {
langwell_otg_del_timer(b_bus_suspend_tmr);
if (langwell->client_ops)
langwell->client_ops->suspend(langwell->pdev,
PMSG_FREEZE);
else
otg_dbg("client driver has been removed.\n");
langwell_otg_drv_vbus(0);
langwell->otg.state = OTG_STATE_A_WAIT_VFALL;
} else if (langwell->hsm.b_bus_suspend) {
langwell_otg_del_timer(b_bus_suspend_tmr);
if (langwell->client_ops)
langwell->client_ops->suspend(langwell->pdev,
PMSG_FREEZE);
else
otg_dbg("client driver has been removed.\n");
if (langwell->host_ops)
langwell->host_ops->probe(langwell->pdev,
langwell->host_ops->id_table);
else
otg_dbg("host driver not loaded.\n");
langwell->hsm.a_set_b_hnp_en = 0;
langwell->hsm.a_wait_bcon_tmout = 0;
langwell_otg_add_timer(a_wait_bcon_tmr);
langwell->otg.state = OTG_STATE_A_WAIT_BCON;
} else if (langwell->hsm.b_bus_suspend_tmout) {
u32 val;
val = readl(langwell->regs + CI_PORTSC1);
if (!(val & PORTSC_SUSP))
break;
if (langwell->client_ops)
langwell->client_ops->suspend(langwell->pdev,
PMSG_FREEZE);
else
otg_dbg("client driver has been removed.\n");
if (langwell->host_ops)
langwell->host_ops->probe(langwell->pdev,
langwell->host_ops->id_table);
else
otg_dbg("host driver not loaded.\n");
langwell->hsm.a_set_b_hnp_en = 0;
langwell->hsm.a_wait_bcon_tmout = 0;
langwell_otg_add_timer(a_wait_bcon_tmr);
langwell->otg.state = OTG_STATE_A_WAIT_BCON;
}
break;
case OTG_STATE_A_VBUS_ERR:
if (langwell->hsm.id) {
langwell->otg.default_a = 0;
langwell->hsm.a_clr_err = 0;
langwell->hsm.a_srp_det = 0;
langwell->otg.state = OTG_STATE_B_IDLE;
queue_work(langwell->qwork, &langwell->work);
} else if (langwell->hsm.a_clr_err) {
langwell->hsm.a_clr_err = 0;
langwell->hsm.a_srp_det = 0;
reset_otg();
init_hsm();
if (langwell->otg.state == OTG_STATE_A_IDLE)
queue_work(langwell->qwork, &langwell->work);
}
break;
case OTG_STATE_A_WAIT_VFALL:
if (langwell->hsm.id) {
langwell->otg.default_a = 0;
langwell->otg.state = OTG_STATE_B_IDLE;
queue_work(langwell->qwork, &langwell->work);
} else if (langwell->hsm.a_bus_req) {
langwell_otg_drv_vbus(1);
langwell->hsm.a_wait_vrise_tmout = 0;
langwell_otg_add_timer(a_wait_vrise_tmr);
langwell->otg.state = OTG_STATE_A_WAIT_VRISE;
} else if (!langwell->hsm.a_sess_vld) {
langwell->hsm.a_srp_det = 0;
langwell_otg_drv_vbus(0);
set_host_mode();
langwell->otg.state = OTG_STATE_A_IDLE;
}
break;
default:
;
}
otg_dbg("%s: new state = %s\n", __func__,
state_string(langwell->otg.state));
}
static ssize_t
show_registers(struct device *_dev, struct device_attribute *attr, char *buf)
{
struct langwell_otg *langwell;
char *next;
unsigned size;
unsigned t;
langwell = the_transceiver;
next = buf;
size = PAGE_SIZE;
t = scnprintf(next, size,
"\n"
"USBCMD = 0x%08x \n"
"USBSTS = 0x%08x \n"
"USBINTR = 0x%08x \n"
"ASYNCLISTADDR = 0x%08x \n"
"PORTSC1 = 0x%08x \n"
"HOSTPC1 = 0x%08x \n"
"OTGSC = 0x%08x \n"
"USBMODE = 0x%08x \n",
readl(langwell->regs + 0x30),
readl(langwell->regs + 0x34),
readl(langwell->regs + 0x38),
readl(langwell->regs + 0x48),
readl(langwell->regs + 0x74),
readl(langwell->regs + 0xb4),
readl(langwell->regs + 0xf4),
readl(langwell->regs + 0xf8)
);
size -= t;
next += t;
return PAGE_SIZE - size;
}
static DEVICE_ATTR(registers, S_IRUGO, show_registers, NULL);
static ssize_t
show_hsm(struct device *_dev, struct device_attribute *attr, char *buf)
{
struct langwell_otg *langwell;
char *next;
unsigned size;
unsigned t;
langwell = the_transceiver;
next = buf;
size = PAGE_SIZE;
t = scnprintf(next, size,
"\n"
"current state = %s\n"
"a_bus_resume = \t%d\n"
"a_bus_suspend = \t%d\n"
"a_conn = \t%d\n"
"a_sess_vld = \t%d\n"
"a_srp_det = \t%d\n"
"a_vbus_vld = \t%d\n"
"b_bus_resume = \t%d\n"
"b_bus_suspend = \t%d\n"
"b_conn = \t%d\n"
"b_se0_srp = \t%d\n"
"b_sess_end = \t%d\n"
"b_sess_vld = \t%d\n"
"id = \t%d\n"
"a_set_b_hnp_en = \t%d\n"
"b_srp_done = \t%d\n"
"b_hnp_enable = \t%d\n"
"a_wait_vrise_tmout = \t%d\n"
"a_wait_bcon_tmout = \t%d\n"
"a_aidl_bdis_tmout = \t%d\n"
"b_ase0_brst_tmout = \t%d\n"
"a_bus_drop = \t%d\n"
"a_bus_req = \t%d\n"
"a_clr_err = \t%d\n"
"a_suspend_req = \t%d\n"
"b_bus_req = \t%d\n"
"b_bus_suspend_tmout = \t%d\n"
"b_bus_suspend_vld = \t%d\n",
state_string(langwell->otg.state),
langwell->hsm.a_bus_resume,
langwell->hsm.a_bus_suspend,
langwell->hsm.a_conn,
langwell->hsm.a_sess_vld,
langwell->hsm.a_srp_det,
langwell->hsm.a_vbus_vld,
langwell->hsm.b_bus_resume,
langwell->hsm.b_bus_suspend,
langwell->hsm.b_conn,
langwell->hsm.b_se0_srp,
langwell->hsm.b_sess_end,
langwell->hsm.b_sess_vld,
langwell->hsm.id,
langwell->hsm.a_set_b_hnp_en,
langwell->hsm.b_srp_done,
langwell->hsm.b_hnp_enable,
langwell->hsm.a_wait_vrise_tmout,
langwell->hsm.a_wait_bcon_tmout,
langwell->hsm.a_aidl_bdis_tmout,
langwell->hsm.b_ase0_brst_tmout,
langwell->hsm.a_bus_drop,
langwell->hsm.a_bus_req,
langwell->hsm.a_clr_err,
langwell->hsm.a_suspend_req,
langwell->hsm.b_bus_req,
langwell->hsm.b_bus_suspend_tmout,
langwell->hsm.b_bus_suspend_vld
);
size -= t;
next += t;
return PAGE_SIZE - size;
}
static DEVICE_ATTR(hsm, S_IRUGO, show_hsm, NULL);
static ssize_t
get_a_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
{
struct langwell_otg *langwell;
char *next;
unsigned size;
unsigned t;
langwell = the_transceiver;
next = buf;
size = PAGE_SIZE;
t = scnprintf(next, size, "%d", langwell->hsm.a_bus_req);
size -= t;
next += t;
return PAGE_SIZE - size;
}
static ssize_t
set_a_bus_req(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct langwell_otg *langwell;
langwell = the_transceiver;
if (!langwell->otg.default_a)
return -1;
if (count > 2)
return -1;
if (buf[0] == '0') {
langwell->hsm.a_bus_req = 0;
otg_dbg("a_bus_req = 0\n");
} else if (buf[0] == '1') {
/* If a_bus_drop is TRUE, a_bus_req can't be set */
if (langwell->hsm.a_bus_drop)
return -1;
langwell->hsm.a_bus_req = 1;
otg_dbg("a_bus_req = 1\n");
}
if (spin_trylock(&langwell->wq_lock)) {
queue_work(langwell->qwork, &langwell->work);
spin_unlock(&langwell->wq_lock);
}
return count;
}
static DEVICE_ATTR(a_bus_req, S_IRUGO | S_IWUGO, get_a_bus_req, set_a_bus_req);
static ssize_t
get_a_bus_drop(struct device *dev, struct device_attribute *attr, char *buf)
{
struct langwell_otg *langwell;
char *next;
unsigned size;
unsigned t;
langwell = the_transceiver;
next = buf;
size = PAGE_SIZE;
t = scnprintf(next, size, "%d", langwell->hsm.a_bus_drop);
size -= t;
next += t;
return PAGE_SIZE - size;
}
static ssize_t
set_a_bus_drop(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct langwell_otg *langwell;
langwell = the_transceiver;
if (!langwell->otg.default_a)
return -1;
if (count > 2)
return -1;
if (buf[0] == '0') {
langwell->hsm.a_bus_drop = 0;
otg_dbg("a_bus_drop = 0\n");
} else if (buf[0] == '1') {
langwell->hsm.a_bus_drop = 1;
langwell->hsm.a_bus_req = 0;
otg_dbg("a_bus_drop = 1, then a_bus_req = 0\n");
}
if (spin_trylock(&langwell->wq_lock)) {
queue_work(langwell->qwork, &langwell->work);
spin_unlock(&langwell->wq_lock);
}
return count;
}
static DEVICE_ATTR(a_bus_drop, S_IRUGO | S_IWUGO,
get_a_bus_drop, set_a_bus_drop);
static ssize_t
get_b_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
{
struct langwell_otg *langwell;
char *next;
unsigned size;
unsigned t;
langwell = the_transceiver;
next = buf;
size = PAGE_SIZE;
t = scnprintf(next, size, "%d", langwell->hsm.b_bus_req);
size -= t;
next += t;
return PAGE_SIZE - size;
}
static ssize_t
set_b_bus_req(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct langwell_otg *langwell;
langwell = the_transceiver;
if (langwell->otg.default_a)
return -1;
if (count > 2)
return -1;
if (buf[0] == '0') {
langwell->hsm.b_bus_req = 0;
otg_dbg("b_bus_req = 0\n");
} else if (buf[0] == '1') {
langwell->hsm.b_bus_req = 1;
otg_dbg("b_bus_req = 1\n");
}
if (spin_trylock(&langwell->wq_lock)) {
queue_work(langwell->qwork, &langwell->work);
spin_unlock(&langwell->wq_lock);
}
return count;
}
static DEVICE_ATTR(b_bus_req, S_IRUGO | S_IWUGO, get_b_bus_req, set_b_bus_req);
static ssize_t
set_a_clr_err(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct langwell_otg *langwell;
langwell = the_transceiver;
if (!langwell->otg.default_a)
return -1;
if (count > 2)
return -1;
if (buf[0] == '1') {
langwell->hsm.a_clr_err = 1;
otg_dbg("a_clr_err = 1\n");
}
if (spin_trylock(&langwell->wq_lock)) {
queue_work(langwell->qwork, &langwell->work);
spin_unlock(&langwell->wq_lock);
}
return count;
}
static DEVICE_ATTR(a_clr_err, S_IWUGO, NULL, set_a_clr_err);
static struct attribute *inputs_attrs[] = {
&dev_attr_a_bus_req.attr,
&dev_attr_a_bus_drop.attr,
&dev_attr_b_bus_req.attr,
&dev_attr_a_clr_err.attr,
NULL,
};
static struct attribute_group debug_dev_attr_group = {
.name = "inputs",
.attrs = inputs_attrs,
};
int langwell_register_host(struct pci_driver *host_driver)
{
int ret = 0;
the_transceiver->host_ops = host_driver;
queue_work(the_transceiver->qwork, &the_transceiver->work);
otg_dbg("host controller driver is registered\n");
return ret;
}
EXPORT_SYMBOL(langwell_register_host);
void langwell_unregister_host(struct pci_driver *host_driver)
{
if (the_transceiver->host_ops)
the_transceiver->host_ops->remove(the_transceiver->pdev);
the_transceiver->host_ops = NULL;
the_transceiver->hsm.a_bus_drop = 1;
queue_work(the_transceiver->qwork, &the_transceiver->work);
otg_dbg("host controller driver is unregistered\n");
}
EXPORT_SYMBOL(langwell_unregister_host);
int langwell_register_peripheral(struct pci_driver *client_driver)
{
int ret = 0;
if (client_driver)
ret = client_driver->probe(the_transceiver->pdev,
client_driver->id_table);
if (!ret) {
the_transceiver->client_ops = client_driver;
queue_work(the_transceiver->qwork, &the_transceiver->work);
otg_dbg("client controller driver is registered\n");
}
return ret;
}
EXPORT_SYMBOL(langwell_register_peripheral);
void langwell_unregister_peripheral(struct pci_driver *client_driver)
{
if (the_transceiver->client_ops)
the_transceiver->client_ops->remove(the_transceiver->pdev);
the_transceiver->client_ops = NULL;
the_transceiver->hsm.b_bus_req = 0;
queue_work(the_transceiver->qwork, &the_transceiver->work);
otg_dbg("client controller driver is unregistered\n");
}
EXPORT_SYMBOL(langwell_unregister_peripheral);
static int langwell_otg_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
unsigned long resource, len;
void __iomem *base = NULL;
int retval;
u32 val32;
struct langwell_otg *langwell;
char qname[] = "langwell_otg_queue";
retval = 0;
otg_dbg("\notg controller is detected.\n");
if (pci_enable_device(pdev) < 0) {
retval = -ENODEV;
goto done;
}
langwell = kzalloc(sizeof *langwell, GFP_KERNEL);
if (langwell == NULL) {
retval = -ENOMEM;
goto done;
}
the_transceiver = langwell;
/* control register: BAR 0 */
resource = pci_resource_start(pdev, 0);
len = pci_resource_len(pdev, 0);
if (!request_mem_region(resource, len, driver_name)) {
retval = -EBUSY;
goto err;
}
langwell->region = 1;
base = ioremap_nocache(resource, len);
if (base == NULL) {
retval = -EFAULT;
goto err;
}
langwell->regs = base;
if (!pdev->irq) {
otg_dbg("No IRQ.\n");
retval = -ENODEV;
goto err;
}
langwell->qwork = create_workqueue(qname);
if (!langwell->qwork) {
otg_dbg("cannot create workqueue %s\n", qname);
retval = -ENOMEM;
goto err;
}
INIT_WORK(&langwell->work, langwell_otg_work);
/* OTG common part */
langwell->pdev = pdev;
langwell->otg.dev = &pdev->dev;
langwell->otg.label = driver_name;
langwell->otg.set_host = langwell_otg_set_host;
langwell->otg.set_peripheral = langwell_otg_set_peripheral;
langwell->otg.set_power = langwell_otg_set_power;
langwell->otg.start_srp = langwell_otg_start_srp;
langwell->otg.state = OTG_STATE_UNDEFINED;
if (otg_set_transceiver(&langwell->otg)) {
otg_dbg("can't set transceiver\n");
retval = -EBUSY;
goto err;
}
reset_otg();
init_hsm();
spin_lock_init(&langwell->lock);
spin_lock_init(&langwell->wq_lock);
INIT_LIST_HEAD(&active_timers);
langwell_otg_init_timers(&langwell->hsm);
if (request_irq(pdev->irq, otg_irq, IRQF_SHARED,
driver_name, langwell) != 0) {
otg_dbg("request interrupt %d failed\n", pdev->irq);
retval = -EBUSY;
goto err;
}
/* enable OTGSC int */
val32 = OTGSC_DPIE | OTGSC_BSEIE | OTGSC_BSVIE |
OTGSC_ASVIE | OTGSC_AVVIE | OTGSC_IDIE | OTGSC_IDPU;
writel(val32, langwell->regs + CI_OTGSC);
retval = device_create_file(&pdev->dev, &dev_attr_registers);
if (retval < 0) {
otg_dbg("Can't register sysfs attribute: %d\n", retval);
goto err;
}
retval = device_create_file(&pdev->dev, &dev_attr_hsm);
if (retval < 0) {
otg_dbg("Can't hsm sysfs attribute: %d\n", retval);
goto err;
}
retval = sysfs_create_group(&pdev->dev.kobj, &debug_dev_attr_group);
if (retval < 0) {
otg_dbg("Can't register sysfs attr group: %d\n", retval);
goto err;
}
if (langwell->otg.state == OTG_STATE_A_IDLE)
queue_work(langwell->qwork, &langwell->work);
return 0;
err:
if (the_transceiver)
langwell_otg_remove(pdev);
done:
return retval;
}
static void langwell_otg_remove(struct pci_dev *pdev)
{
struct langwell_otg *langwell;
langwell = the_transceiver;
if (langwell->qwork) {
flush_workqueue(langwell->qwork);
destroy_workqueue(langwell->qwork);
}
langwell_otg_free_timers();
/* disable OTGSC interrupt as OTGSC doesn't change in reset */
writel(0, langwell->regs + CI_OTGSC);
if (pdev->irq)
free_irq(pdev->irq, langwell);
if (langwell->regs)
iounmap(langwell->regs);
if (langwell->region)
release_mem_region(pci_resource_start(pdev, 0),
pci_resource_len(pdev, 0));
otg_set_transceiver(NULL);
pci_disable_device(pdev);
sysfs_remove_group(&pdev->dev.kobj, &debug_dev_attr_group);
device_remove_file(&pdev->dev, &dev_attr_hsm);
device_remove_file(&pdev->dev, &dev_attr_registers);
kfree(langwell);
langwell = NULL;
}
static void transceiver_suspend(struct pci_dev *pdev)
{
pci_save_state(pdev);
pci_set_power_state(pdev, PCI_D3hot);
langwell_otg_phy_low_power(1);
}
static int langwell_otg_suspend(struct pci_dev *pdev, pm_message_t message)
{
int ret = 0;
struct langwell_otg *langwell;
langwell = the_transceiver;
/* Disbale OTG interrupts */
langwell_otg_intr(0);
if (pdev->irq)
free_irq(pdev->irq, langwell);
/* Prevent more otg_work */
flush_workqueue(langwell->qwork);
spin_lock(&langwell->wq_lock);
/* start actions */
switch (langwell->otg.state) {
case OTG_STATE_A_IDLE:
case OTG_STATE_B_IDLE:
case OTG_STATE_A_WAIT_VFALL:
case OTG_STATE_A_VBUS_ERR:
transceiver_suspend(pdev);
break;
case OTG_STATE_A_WAIT_VRISE:
langwell_otg_del_timer(a_wait_vrise_tmr);
langwell->hsm.a_srp_det = 0;
langwell_otg_drv_vbus(0);
langwell->otg.state = OTG_STATE_A_IDLE;
transceiver_suspend(pdev);
break;
case OTG_STATE_A_WAIT_BCON:
langwell_otg_del_timer(a_wait_bcon_tmr);
if (langwell->host_ops)
ret = langwell->host_ops->suspend(pdev, message);
langwell_otg_drv_vbus(0);
break;
case OTG_STATE_A_HOST:
if (langwell->host_ops)
ret = langwell->host_ops->suspend(pdev, message);
langwell_otg_drv_vbus(0);
langwell_otg_phy_low_power(1);
break;
case OTG_STATE_A_SUSPEND:
langwell_otg_del_timer(a_aidl_bdis_tmr);
langwell_otg_HABA(0);
if (langwell->host_ops)
langwell->host_ops->remove(pdev);
else
otg_dbg("host driver has been removed.\n");
langwell_otg_drv_vbus(0);
transceiver_suspend(pdev);
langwell->otg.state = OTG_STATE_A_WAIT_VFALL;
break;
case OTG_STATE_A_PERIPHERAL:
if (langwell->client_ops)
ret = langwell->client_ops->suspend(pdev, message);
else
otg_dbg("client driver has been removed.\n");
langwell_otg_drv_vbus(0);
transceiver_suspend(pdev);
langwell->otg.state = OTG_STATE_A_WAIT_VFALL;
break;
case OTG_STATE_B_HOST:
if (langwell->host_ops)
langwell->host_ops->remove(pdev);
else
otg_dbg("host driver has been removed.\n");
langwell->hsm.b_bus_req = 0;
transceiver_suspend(pdev);
langwell->otg.state = OTG_STATE_B_IDLE;
break;
case OTG_STATE_B_PERIPHERAL:
if (langwell->client_ops)
ret = langwell->client_ops->suspend(pdev, message);
else
otg_dbg("client driver has been removed.\n");
break;
case OTG_STATE_B_WAIT_ACON:
langwell_otg_del_timer(b_ase0_brst_tmr);
langwell_otg_HAAR(0);
if (langwell->host_ops)
langwell->host_ops->remove(pdev);
else
otg_dbg("host driver has been removed.\n");
langwell->hsm.b_bus_req = 0;
langwell->otg.state = OTG_STATE_B_IDLE;
transceiver_suspend(pdev);
break;
default:
otg_dbg("error state before suspend\n ");
break;
}
spin_unlock(&langwell->wq_lock);
return ret;
}
static void transceiver_resume(struct pci_dev *pdev)
{
pci_restore_state(pdev);
pci_set_power_state(pdev, PCI_D0);
langwell_otg_phy_low_power(0);
}
static int langwell_otg_resume(struct pci_dev *pdev)
{
int ret = 0;
struct langwell_otg *langwell;
langwell = the_transceiver;
spin_lock(&langwell->wq_lock);
switch (langwell->otg.state) {
case OTG_STATE_A_IDLE:
case OTG_STATE_B_IDLE:
case OTG_STATE_A_WAIT_VFALL:
case OTG_STATE_A_VBUS_ERR:
transceiver_resume(pdev);
break;
case OTG_STATE_A_WAIT_BCON:
langwell_otg_add_timer(a_wait_bcon_tmr);
langwell_otg_drv_vbus(1);
if (langwell->host_ops)
ret = langwell->host_ops->resume(pdev);
break;
case OTG_STATE_A_HOST:
langwell_otg_drv_vbus(1);
langwell_otg_phy_low_power(0);
if (langwell->host_ops)
ret = langwell->host_ops->resume(pdev);
break;
case OTG_STATE_B_PERIPHERAL:
if (langwell->client_ops)
ret = langwell->client_ops->resume(pdev);
else
otg_dbg("client driver not loaded.\n");
break;
default:
otg_dbg("error state before suspend\n ");
break;
}
if (request_irq(pdev->irq, otg_irq, IRQF_SHARED,
driver_name, the_transceiver) != 0) {
otg_dbg("request interrupt %d failed\n", pdev->irq);
ret = -EBUSY;
}
/* enable OTG interrupts */
langwell_otg_intr(1);
spin_unlock(&langwell->wq_lock);
queue_work(langwell->qwork, &langwell->work);
return ret;
}
static int __init langwell_otg_init(void)
{
return pci_register_driver(&otg_pci_driver);
}
module_init(langwell_otg_init);
static void __exit langwell_otg_cleanup(void)
{
pci_unregister_driver(&otg_pci_driver);
}
module_exit(langwell_otg_cleanup);
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