diff options
Diffstat (limited to 'drivers/usb/otg/langwell_otg.c')
| -rw-r--r-- | drivers/usb/otg/langwell_otg.c | 2408 |
1 files changed, 2408 insertions, 0 deletions
diff --git a/drivers/usb/otg/langwell_otg.c b/drivers/usb/otg/langwell_otg.c new file mode 100644 index 000000000000..bdc3ea66be69 --- /dev/null +++ b/drivers/usb/otg/langwell_otg.c @@ -0,0 +1,2408 @@ +/* + * Intel Langwell USB OTG transceiver driver + * Copyright (C) 2008 - 2010, 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/usb/hcd.h> +#include <linux/notifier.h> +#include <linux/delay.h> +#include <asm/intel_scu_ipc.h> + +#include <linux/usb/langwell_otg.h> + +#define DRIVER_DESC "Intel Langwell USB OTG transceiver driver" +#define DRIVER_VERSION "July 10, 2010" + +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); + if (timer == NULL) + return timer; + + timer->function = function; + timer->expires = expires; + timer->data = data; + return timer; +} + +static struct langwell_otg_timer *a_wait_vrise_tmr, *a_aidl_bdis_tmr, + *b_se0_srp_tmr, *b_srp_init_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(void) +{ + struct langwell_otg *lnw = the_transceiver; + + dev_dbg(lnw->dev, "transceiver is updated\n"); + + if (!lnw->qwork) + return ; + + queue_work(lnw->qwork, &lnw->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 int langwell_otg_set_vbus(struct otg_transceiver *otg, bool enabled) +{ + struct langwell_otg *lnw = the_transceiver; + u8 r; + + dev_dbg(lnw->dev, "%s <--- %s\n", __func__, enabled ? "on" : "off"); + + /* FIXME: surely we should cache this on the first read. If not use + readv to avoid two transactions */ + if (intel_scu_ipc_ioread8(0x00, &r) < 0) { + dev_dbg(lnw->dev, "Failed to read PMIC register 0xD2"); + return -EBUSY; + } + if ((r & 0x03) != 0x02) { + dev_dbg(lnw->dev, "not NEC PMIC attached\n"); + return -EBUSY; + } + + if (intel_scu_ipc_ioread8(0x20, &r) < 0) { + dev_dbg(lnw->dev, "Failed to read PMIC register 0xD2"); + return -EBUSY; + } + + if ((r & 0x20) == 0) { + dev_dbg(lnw->dev, "no battery attached\n"); + return -EBUSY; + } + + /* Workaround for battery attachment issue */ + if (r == 0x34) { + dev_dbg(lnw->dev, "no battery attached on SH\n"); + return -EBUSY; + } + + dev_dbg(lnw->dev, "battery attached. 2 reg = %x\n", r); + + /* workaround: FW detect writing 0x20/0xc0 to d4 event. + * this is only for NEC PMIC. + */ + + if (intel_scu_ipc_iowrite8(0xD4, enabled ? 0x20 : 0xC0)) + dev_dbg(lnw->dev, "Failed to write PMIC.\n"); + + dev_dbg(lnw->dev, "%s --->\n", __func__); + + return 0; +} + +/* charge vbus or discharge vbus through a resistor to ground */ +static void langwell_otg_chrg_vbus(int on) +{ + struct langwell_otg *lnw = the_transceiver; + u32 val; + + val = readl(lnw->iotg.base + CI_OTGSC); + + if (on) + writel((val & ~OTGSC_INTSTS_MASK) | OTGSC_VC, + lnw->iotg.base + CI_OTGSC); + else + writel((val & ~OTGSC_INTSTS_MASK) | OTGSC_VD, + lnw->iotg.base + CI_OTGSC); +} + +/* Start SRP */ +static int langwell_otg_start_srp(struct otg_transceiver *otg) +{ + struct langwell_otg *lnw = the_transceiver; + struct intel_mid_otg_xceiv *iotg = &lnw->iotg; + u32 val; + + dev_dbg(lnw->dev, "%s --->\n", __func__); + + val = readl(iotg->base + CI_OTGSC); + + writel((val & ~OTGSC_INTSTS_MASK) | OTGSC_HADP, + iotg->base + CI_OTGSC); + + /* Check if the data plus is finished or not */ + msleep(8); + val = readl(iotg->base + CI_OTGSC); + if (val & (OTGSC_HADP | OTGSC_DP)) + dev_dbg(lnw->dev, "DataLine SRP Error\n"); + + /* Disable interrupt - b_sess_vld */ + val = readl(iotg->base + CI_OTGSC); + val &= (~(OTGSC_BSVIE | OTGSC_BSEIE)); + writel(val, iotg->base + CI_OTGSC); + + /* Start VBus SRP, drive vbus to generate VBus pulse */ + iotg->otg.set_vbus(&iotg->otg, true); + msleep(15); + iotg->otg.set_vbus(&iotg->otg, false); + + /* Enable interrupt - b_sess_vld*/ + val = readl(iotg->base + CI_OTGSC); + dev_dbg(lnw->dev, "after VBUS pulse otgsc = %x\n", val); + + val |= (OTGSC_BSVIE | OTGSC_BSEIE); + writel(val, iotg->base + CI_OTGSC); + + /* If Vbus is valid, then update the hsm */ + if (val & OTGSC_BSV) { + dev_dbg(lnw->dev, "no b_sess_vld interrupt\n"); + + lnw->iotg.hsm.b_sess_vld = 1; + langwell_update_transceiver(); + } + + dev_dbg(lnw->dev, "%s <---\n", __func__); + return 0; +} + +/* stop SOF via bus_suspend */ +static void langwell_otg_loc_sof(int on) +{ + struct langwell_otg *lnw = the_transceiver; + struct usb_hcd *hcd; + int err; + + dev_dbg(lnw->dev, "%s ---> %s\n", __func__, on ? "suspend" : "resume"); + + hcd = bus_to_hcd(lnw->iotg.otg.host); + if (on) + err = hcd->driver->bus_resume(hcd); + else + err = hcd->driver->bus_suspend(hcd); + + if (err) + dev_dbg(lnw->dev, "Fail to resume/suspend USB bus - %d\n", err); + + dev_dbg(lnw->dev, "%s <---\n", __func__); +} + +static int langwell_otg_check_otgsc(void) +{ + struct langwell_otg *lnw = the_transceiver; + u32 otgsc, usbcfg; + + dev_dbg(lnw->dev, "check sync OTGSC and USBCFG registers\n"); + + otgsc = readl(lnw->iotg.base + CI_OTGSC); + usbcfg = readl(lnw->usbcfg); + + dev_dbg(lnw->dev, "OTGSC = %08x, USBCFG = %08x\n", + otgsc, usbcfg); + dev_dbg(lnw->dev, "OTGSC_AVV = %d\n", !!(otgsc & OTGSC_AVV)); + dev_dbg(lnw->dev, "USBCFG.VBUSVAL = %d\n", + !!(usbcfg & USBCFG_VBUSVAL)); + dev_dbg(lnw->dev, "OTGSC_ASV = %d\n", !!(otgsc & OTGSC_ASV)); + dev_dbg(lnw->dev, "USBCFG.AVALID = %d\n", + !!(usbcfg & USBCFG_AVALID)); + dev_dbg(lnw->dev, "OTGSC_BSV = %d\n", !!(otgsc & OTGSC_BSV)); + dev_dbg(lnw->dev, "USBCFG.BVALID = %d\n", + !!(usbcfg & USBCFG_BVALID)); + dev_dbg(lnw->dev, "OTGSC_BSE = %d\n", !!(otgsc & OTGSC_BSE)); + dev_dbg(lnw->dev, "USBCFG.SESEND = %d\n", + !!(usbcfg & USBCFG_SESEND)); + + /* Check USBCFG VBusValid/AValid/BValid/SessEnd */ + if (!!(otgsc & OTGSC_AVV) ^ !!(usbcfg & USBCFG_VBUSVAL)) { + dev_dbg(lnw->dev, "OTGSC.AVV != USBCFG.VBUSVAL\n"); + goto err; + } + if (!!(otgsc & OTGSC_ASV) ^ !!(usbcfg & USBCFG_AVALID)) { + dev_dbg(lnw->dev, "OTGSC.ASV != USBCFG.AVALID\n"); + goto err; + } + if (!!(otgsc & OTGSC_BSV) ^ !!(usbcfg & USBCFG_BVALID)) { + dev_dbg(lnw->dev, "OTGSC.BSV != USBCFG.BVALID\n"); + goto err; + } + if (!!(otgsc & OTGSC_BSE) ^ !!(usbcfg & USBCFG_SESEND)) { + dev_dbg(lnw->dev, "OTGSC.BSE != USBCFG.SESSEN\n"); + goto err; + } + + dev_dbg(lnw->dev, "OTGSC and USBCFG are synced\n"); + + return 0; + +err: + dev_warn(lnw->dev, "OTGSC isn't equal to USBCFG\n"); + return -EPIPE; +} + + +static void langwell_otg_phy_low_power(int on) +{ + struct langwell_otg *lnw = the_transceiver; + struct intel_mid_otg_xceiv *iotg = &lnw->iotg; + u8 val, phcd; + int retval; + + dev_dbg(lnw->dev, "%s ---> %s mode\n", + __func__, on ? "Low power" : "Normal"); + + phcd = 0x40; + + val = readb(iotg->base + CI_HOSTPC1 + 2); + + if (on) { + /* Due to hardware issue, after set PHCD, sync will failed + * between USBCFG and OTGSC, so before set PHCD, check if + * sync is in process now. If the answer is "yes", then do + * not touch PHCD bit */ + retval = langwell_otg_check_otgsc(); + if (retval) { + dev_dbg(lnw->dev, "Skip PHCD programming..\n"); + return ; + } + + writeb(val | phcd, iotg->base + CI_HOSTPC1 + 2); + } else + writeb(val & ~phcd, iotg->base + CI_HOSTPC1 + 2); + + dev_dbg(lnw->dev, "%s <--- done\n", __func__); +} + +/* After drv vbus, add 2 ms delay to set PHCD */ +static void langwell_otg_phy_low_power_wait(int on) +{ + struct langwell_otg *lnw = the_transceiver; + + dev_dbg(lnw->dev, "add 2ms delay before programing PHCD\n"); + + mdelay(2); + langwell_otg_phy_low_power(on); +} + +/* Enable/Disable OTG interrupt */ +static void langwell_otg_intr(int on) +{ + struct langwell_otg *lnw = the_transceiver; + struct intel_mid_otg_xceiv *iotg = &lnw->iotg; + u32 val; + + dev_dbg(lnw->dev, "%s ---> %s\n", __func__, on ? "on" : "off"); + + val = readl(iotg->base + CI_OTGSC); + + /* OTGSC_INT_MASK doesn't contains 1msInt */ + if (on) { + val = val | (OTGSC_INT_MASK); + writel(val, iotg->base + CI_OTGSC); + } else { + val = val & ~(OTGSC_INT_MASK); + writel(val, iotg->base + CI_OTGSC); + } + + dev_dbg(lnw->dev, "%s <---\n", __func__); +} + +/* set HAAR: Hardware Assist Auto-Reset */ +static void langwell_otg_HAAR(int on) +{ + struct langwell_otg *lnw = the_transceiver; + struct intel_mid_otg_xceiv *iotg = &lnw->iotg; + u32 val; + + dev_dbg(lnw->dev, "%s ---> %s\n", __func__, on ? "on" : "off"); + + val = readl(iotg->base + CI_OTGSC); + if (on) + writel((val & ~OTGSC_INTSTS_MASK) | OTGSC_HAAR, + iotg->base + CI_OTGSC); + else + writel((val & ~OTGSC_INTSTS_MASK) & ~OTGSC_HAAR, + iotg->base + CI_OTGSC); + + dev_dbg(lnw->dev, "%s <---\n", __func__); +} + +/* set HABA: Hardware Assist B-Disconnect to A-Connect */ +static void langwell_otg_HABA(int on) +{ + struct langwell_otg *lnw = the_transceiver; + struct intel_mid_otg_xceiv *iotg = &lnw->iotg; + u32 val; + + dev_dbg(lnw->dev, "%s ---> %s\n", __func__, on ? "on" : "off"); + + val = readl(iotg->base + CI_OTGSC); + if (on) + writel((val & ~OTGSC_INTSTS_MASK) | OTGSC_HABA, + iotg->base + CI_OTGSC); + else + writel((val & ~OTGSC_INTSTS_MASK) & ~OTGSC_HABA, + iotg->base + CI_OTGSC); + + dev_dbg(lnw->dev, "%s <---\n", __func__); +} + +static int langwell_otg_check_se0_srp(int on) +{ + struct langwell_otg *lnw = the_transceiver; + int delay_time = TB_SE0_SRP * 10; + u32 val; + + dev_dbg(lnw->dev, "%s --->\n", __func__); + + do { + udelay(100); + if (!delay_time--) + break; + val = readl(lnw->iotg.base + CI_PORTSC1); + val &= PORTSC_LS; + } while (!val); + + dev_dbg(lnw->dev, "%s <---\n", __func__); + 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) +{ + struct langwell_otg *lnw = the_transceiver; + + switch (indicator) { + case 2: + case 4: + case 6: + case 7: + dev_warn(lnw->dev, + "OTG:NSF-%lu - deivce not responding\n", indicator); + break; + case 3: + dev_warn(lnw->dev, + "OTG:NSF-%lu - deivce not supported\n", indicator); + break; + default: + dev_warn(lnw->dev, "Do not have this kind of NSF\n"); + break; + } +} + +/* Initialize timers */ +static int 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); + if (a_wait_vrise_tmr == NULL) + return -ENOMEM; + a_aidl_bdis_tmr = otg_timer_initializer(&set_tmout, TA_AIDL_BDIS, + (unsigned long)&hsm->a_aidl_bdis_tmout); + if (a_aidl_bdis_tmr == NULL) + return -ENOMEM; + b_se0_srp_tmr = otg_timer_initializer(&set_tmout, TB_SE0_SRP, + (unsigned long)&hsm->b_se0_srp); + if (b_se0_srp_tmr == NULL) + return -ENOMEM; + b_srp_init_tmr = otg_timer_initializer(&set_tmout, TB_SRP_INIT, + (unsigned long)&hsm->b_srp_init_tmout); + if (b_srp_init_tmr == NULL) + return -ENOMEM; + + return 0; +} + +/* Free timers */ +static void langwell_otg_free_timers(void) +{ + kfree(a_wait_vrise_tmr); + kfree(a_aidl_bdis_tmr); + kfree(b_se0_srp_tmr); + kfree(b_srp_init_tmr); +} + +/* The timeout callback function to set time out bit */ +static void langwell_otg_timer_fn(unsigned long indicator) +{ + struct langwell_otg *lnw = the_transceiver; + + *(int *)indicator = 1; + + dev_dbg(lnw->dev, "kernel timer - timeout\n"); + + langwell_update_transceiver(); +} + +/* kernel timer used instead of HW based interrupt */ +static void langwell_otg_add_ktimer(enum langwell_otg_timer_type timers) +{ + struct langwell_otg *lnw = the_transceiver; + struct intel_mid_otg_xceiv *iotg = &lnw->iotg; + unsigned long j = jiffies; + unsigned long data, time; + + switch (timers) { + case TA_WAIT_VRISE_TMR: + iotg->hsm.a_wait_vrise_tmout = 0; + data = (unsigned long)&iotg->hsm.a_wait_vrise_tmout; + time = TA_WAIT_VRISE; + break; + case TA_WAIT_BCON_TMR: + iotg->hsm.a_wait_bcon_tmout = 0; + data = (unsigned long)&iotg->hsm.a_wait_bcon_tmout; + time = TA_WAIT_BCON; + break; + case TA_AIDL_BDIS_TMR: + iotg->hsm.a_aidl_bdis_tmout = 0; + data = (unsigned long)&iotg->hsm.a_aidl_bdis_tmout; + time = TA_AIDL_BDIS; + break; + case TB_ASE0_BRST_TMR: + iotg->hsm.b_ase0_brst_tmout = 0; + data = (unsigned long)&iotg->hsm.b_ase0_brst_tmout; + time = TB_ASE0_BRST; + break; + case TB_SRP_INIT_TMR: + iotg->hsm.b_srp_init_tmout = 0; + data = (unsigned long)&iotg->hsm.b_srp_init_tmout; + time = TB_SRP_INIT; + break; + case TB_SRP_FAIL_TMR: + iotg->hsm.b_srp_fail_tmout = 0; + data = (unsigned long)&iotg->hsm.b_srp_fail_tmout; + time = TB_SRP_FAIL; + break; + case TB_BUS_SUSPEND_TMR: + iotg->hsm.b_bus_suspend_tmout = 0; + data = (unsigned long)&iotg->hsm.b_bus_suspend_tmout; + time = TB_BUS_SUSPEND; + break; + default: + dev_dbg(lnw->dev, "unkown timer, cannot enable it\n"); + return; + } + + lnw->hsm_timer.data = data; + lnw->hsm_timer.function = langwell_otg_timer_fn; + lnw->hsm_timer.expires = j + time * HZ / 1000; /* milliseconds */ + + add_timer(&lnw->hsm_timer); + + dev_dbg(lnw->dev, "add timer successfully\n"); +} + +/* 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; + struct intel_mid_otg_xceiv *iotg = &the_transceiver->iotg; + 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(iotg->base + CI_OTGSC); + writel(val32 | OTGSC_1MSE, iotg->base + 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 *lnw = the_transceiver; + 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(lnw->iotg.base + CI_OTGSC); + writel(val32 & ~OTGSC_1MSE, lnw->iotg.base + CI_OTGSC); + } +} + +/* Reduce timer count by 1, and find timeout conditions.*/ +static int langwell_otg_tick_timer(u32 *int_sts) +{ + struct langwell_otg *lnw = the_transceiver; + 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)) { + dev_dbg(lnw->dev, "tick timer: disable 1ms int\n"); + *int_sts = *int_sts & ~OTGSC_1MSE; + } + return expired; +} + +static void reset_otg(void) +{ + struct langwell_otg *lnw = the_transceiver; + int delay_time = 1000; + u32 val; + + dev_dbg(lnw->dev, "reseting OTG controller ...\n"); + val = readl(lnw->iotg.base + CI_USBCMD); + writel(val | USBCMD_RST, lnw->iotg.base + CI_USBCMD); + do { + udelay(100); + if (!delay_time--) + dev_dbg(lnw->dev, "reset timeout\n"); + val = readl(lnw->iotg.base + CI_USBCMD); + val &= USBCMD_RST; + } while (val != 0); + dev_dbg(lnw->dev, "reset done.\n"); +} + +static void set_host_mode(void) +{ + struct langwell_otg *lnw = the_transceiver; + u32 val; + + reset_otg(); + val = readl(lnw->iotg.base + CI_USBMODE); + val = (val & (~USBMODE_CM)) | USBMODE_HOST; + writel(val, lnw->iotg.base + CI_USBMODE); +} + +static void set_client_mode(void) +{ + struct langwell_otg *lnw = the_transceiver; + u32 val; + + reset_otg(); + val = readl(lnw->iotg.base + CI_USBMODE); + val = (val & (~USBMODE_CM)) | USBMODE_DEVICE; + writel(val, lnw->iotg.base + CI_USBMODE); +} + +static void init_hsm(void) +{ + struct langwell_otg *lnw = the_transceiver; + struct intel_mid_otg_xceiv *iotg = &lnw->iotg; + u32 val32; + + /* read OTGSC after reset */ + val32 = readl(lnw->iotg.base + CI_OTGSC); + dev_dbg(lnw->dev, "%s: OTGSC init value = 0x%x\n", __func__, val32); + + /* set init state */ + if (val32 & OTGSC_ID) { + iotg->hsm.id = 1; + iotg->otg.default_a = 0; + set_client_mode(); + iotg->otg.state = OTG_STATE_B_IDLE; + } else { + iotg->hsm.id = 0; + iotg->otg.default_a = 1; + set_host_mode(); + iotg->otg.state = OTG_STATE_A_IDLE; + } + + /* set session indicator */ + if (val32 & OTGSC_BSE) + iotg->hsm.b_sess_end = 1; + if (val32 & OTGSC_BSV) + iotg->hsm.b_sess_vld = 1; + if (val32 & OTGSC_ASV) + iotg->hsm.a_sess_vld = 1; + if (val32 & OTGSC_AVV) + iotg->hsm.a_vbus_vld = 1; + + /* defautly power the bus */ + iotg->hsm.a_bus_req = 1; + iotg->hsm.a_bus_drop = 0; + /* defautly don't request bus as B device */ + iotg->hsm.b_bus_req = 0; + /* no system error */ + iotg->hsm.a_clr_err = 0; + + langwell_otg_phy_low_power_wait(1); +} + +static void update_hsm(void) +{ + struct langwell_otg *lnw = the_transceiver; + struct intel_mid_otg_xceiv *iotg = &lnw->iotg; + u32 val32; + + /* read OTGSC */ + val32 = readl(lnw->iotg.base + CI_OTGSC); + dev_dbg(lnw->dev, "%s: OTGSC value = 0x%x\n", __func__, val32); + + iotg->hsm.id = !!(val32 & OTGSC_ID); + iotg->hsm.b_sess_end = !!(val32 & OTGSC_BSE); + iotg->hsm.b_sess_vld = !!(val32 & OTGSC_BSV); + iotg->hsm.a_sess_vld = !!(val32 & OTGSC_ASV); + iotg->hsm.a_vbus_vld = !!(val32 & OTGSC_AVV); +} + +static irqreturn_t otg_dummy_irq(int irq, void *_dev) +{ + struct langwell_otg *lnw = the_transceiver; + 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 (lnw->iotg.hsm.b_conn) { + lnw->iotg.hsm.b_conn = 0; + if (spin_trylock(&lnw->wq_lock)) { + langwell_update_transceiver(); + spin_unlock(&lnw->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 *lnw = _dev; + struct intel_mid_otg_xceiv *iotg = &lnw->iotg; + u32 int_sts, int_en; + u32 int_mask = 0; + int flag = 0; + + int_sts = readl(lnw->iotg.base + 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) { + dev_dbg(lnw->dev, "%s: id change int\n", __func__); + iotg->hsm.id = (int_sts & OTGSC_ID) ? 1 : 0; + dev_dbg(lnw->dev, "id = %d\n", iotg->hsm.id); + flag = 1; + } + if (int_mask & OTGSC_DPIS) { + dev_dbg(lnw->dev, "%s: data pulse int\n", __func__); + iotg->hsm.a_srp_det = (int_sts & OTGSC_DPS) ? 1 : 0; + dev_dbg(lnw->dev, "data pulse = %d\n", iotg->hsm.a_srp_det); + flag = 1; + } + if (int_mask & OTGSC_BSEIS) { + dev_dbg(lnw->dev, "%s: b session end int\n", __func__); + iotg->hsm.b_sess_end = (int_sts & OTGSC_BSE) ? 1 : 0; + dev_dbg(lnw->dev, "b_sess_end = %d\n", iotg->hsm.b_sess_end); + flag = 1; + } + if (int_mask & OTGSC_BSVIS) { + dev_dbg(lnw->dev, "%s: b session valid int\n", __func__); + iotg->hsm.b_sess_vld = (int_sts & OTGSC_BSV) ? 1 : 0; + dev_dbg(lnw->dev, "b_sess_vld = %d\n", iotg->hsm.b_sess_end); + flag = 1; + } + if (int_mask & OTGSC_ASVIS) { + dev_dbg(lnw->dev, "%s: a session valid int\n", __func__); + iotg->hsm.a_sess_vld = (int_sts & OTGSC_ASV) ? 1 : 0; + dev_dbg(lnw->dev, "a_sess_vld = %d\n", iotg->hsm.a_sess_vld); + flag = 1; + } + if (int_mask & OTGSC_AVVIS) { + dev_dbg(lnw->dev, "%s: a vbus valid int\n", __func__); + iotg->hsm.a_vbus_vld = (int_sts & OTGSC_AVV) ? 1 : 0; + dev_dbg(lnw->dev, "a_vbus_vld = %d\n", iotg->hsm.a_vbus_vld); + 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, + lnw->iotg.base + CI_OTGSC); + if (flag) + langwell_update_transceiver(); + + return IRQ_HANDLED; +} + +static int langwell_otg_iotg_notify(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct langwell_otg *lnw = the_transceiver; + struct intel_mid_otg_xceiv *iotg = data; + int flag = 0; + + if (iotg == NULL) + return NOTIFY_BAD; + + if (lnw == NULL) + return NOTIFY_BAD; + + switch (action) { + case MID_OTG_NOTIFY_CONNECT: + dev_dbg(lnw->dev, "Lnw OTG Notify Connect Event\n"); + if (iotg->otg.default_a == 1) + iotg->hsm.b_conn = 1; + else + iotg->hsm.a_conn = 1; + flag = 1; + break; + case MID_OTG_NOTIFY_DISCONN: + dev_dbg(lnw->dev, "Lnw OTG Notify Disconnect Event\n"); + if (iotg->otg.default_a == 1) + iotg->hsm.b_conn = 0; + else + iotg->hsm.a_conn = 0; + flag = 1; + break; + case MID_OTG_NOTIFY_HSUSPEND: + dev_dbg(lnw->dev, "Lnw OTG Notify Host Bus suspend Event\n"); + if (iotg->otg.default_a == 1) + iotg->hsm.a_suspend_req = 1; + else + iotg->hsm.b_bus_req = 0; + flag = 1; + break; + case MID_OTG_NOTIFY_HRESUME: + dev_dbg(lnw->dev, "Lnw OTG Notify Host Bus resume Event\n"); + if (iotg->otg.default_a == 1) + iotg->hsm.b_bus_resume = 1; + flag = 1; + break; + case MID_OTG_NOTIFY_CSUSPEND: + dev_dbg(lnw->dev, "Lnw OTG Notify Client Bus suspend Event\n"); + if (iotg->otg.default_a == 1) { + if (iotg->hsm.b_bus_suspend_vld == 2) { + iotg->hsm.b_bus_suspend = 1; + iotg->hsm.b_bus_suspend_vld = 0; + flag = 1; + } else { + iotg->hsm.b_bus_suspend_vld++; + flag = 0; + } + } else { + if (iotg->hsm.a_bus_suspend == 0) { + iotg->hsm.a_bus_suspend = 1; + flag = 1; + } + } + break; + case MID_OTG_NOTIFY_CRESUME: + dev_dbg(lnw->dev, "Lnw OTG Notify Client Bus resume Event\n"); + if (iotg->otg.default_a == 0) + iotg->hsm.a_bus_suspend = 0; + flag = 0; + break; + case MID_OTG_NOTIFY_HOSTADD: + dev_dbg(lnw->dev, "Lnw OTG Nofity Host Driver Add\n"); + flag = 1; + break; + case MID_OTG_NOTIFY_HOSTREMOVE: + dev_dbg(lnw->dev, "Lnw OTG Nofity Host Driver remove\n"); + flag = 1; + break; + case MID_OTG_NOTIFY_CLIENTADD: + dev_dbg(lnw->dev, "Lnw OTG Nofity Client Driver Add\n"); + flag = 1; + break; + case MID_OTG_NOTIFY_CLIENTREMOVE: + dev_dbg(lnw->dev, "Lnw OTG Nofity Client Driver remove\n"); + flag = 1; + break; + default: + dev_dbg(lnw->dev, "Lnw OTG Nofity unknown notify message\n"); + return NOTIFY_DONE; + } + + if (flag) + langwell_update_transceiver(); + + return NOTIFY_OK; +} + +static void langwell_otg_work(struct work_struct *work) +{ + struct langwell_otg *lnw; + struct intel_mid_otg_xceiv *iotg; + int retval; + struct pci_dev *pdev; + + lnw = container_of(work, struct langwell_otg, work); + iotg = &lnw->iotg; + pdev = to_pci_dev(lnw->dev); + + dev_dbg(lnw->dev, "%s: old state = %s\n", __func__, + state_string(iotg->otg.state)); + + switch (iotg->otg.state) { + case OTG_STATE_UNDEFINED: + case OTG_STATE_B_IDLE: + if (!iotg->hsm.id) { + langwell_otg_del_timer(b_srp_init_tmr); + del_timer_sync(&lnw->hsm_timer); + + iotg->otg.default_a = 1; + iotg->hsm.a_srp_det = 0; + + langwell_otg_chrg_vbus(0); + set_host_mode(); + langwell_otg_phy_low_power(1); + + iotg->otg.state = OTG_STATE_A_IDLE; + langwell_update_transceiver(); + } else if (iotg->hsm.b_sess_vld) { + langwell_otg_del_timer(b_srp_init_tmr); + del_timer_sync(&lnw->hsm_timer); + iotg->hsm.b_sess_end = 0; + iotg->hsm.a_bus_suspend = 0; + langwell_otg_chrg_vbus(0); + + if (lnw->iotg.start_peripheral) { + lnw->iotg.start_peripheral(&lnw->iotg); + iotg->otg.state = OTG_STATE_B_PERIPHERAL; + } else + dev_dbg(lnw->dev, "client driver not loaded\n"); + + } else if (iotg->hsm.b_srp_init_tmout) { + iotg->hsm.b_srp_init_tmout = 0; + dev_warn(lnw->dev, "SRP init timeout\n"); + } else if (iotg->hsm.b_srp_fail_tmout) { + iotg->hsm.b_srp_fail_tmout = 0; + iotg->hsm.b_bus_req = 0; + + /* No silence failure */ + langwell_otg_nsf_msg(6); + } else if (iotg->hsm.b_bus_req && iotg->hsm.b_sess_end) { + del_timer_sync(&lnw->hsm_timer); + /* workaround for b_se0_srp detection */ + retval = langwell_otg_check_se0_srp(0); + if (retval) { + iotg->hsm.b_bus_req = 0; + dev_dbg(lnw->dev, "LS isn't SE0, try later\n"); + } else { + /* clear the PHCD before start srp */ + langwell_otg_phy_low_power(0); + + /* Start SRP */ + langwell_otg_add_timer(b_srp_init_tmr); + iotg->otg.start_srp(&iotg->otg); + langwell_otg_del_timer(b_srp_init_tmr); + langwell_otg_add_ktimer(TB_SRP_FAIL_TMR); + + /* reset PHY low power mode here */ + langwell_otg_phy_low_power_wait(1); + } + } + break; + case OTG_STATE_B_SRP_INIT: + if (!iotg->hsm.id) { + iotg->otg.default_a = 1; + iotg->hsm.a_srp_det = 0; + + /* Turn off VBus */ + iotg->otg.set_vbus(&iotg->otg, false); + langwell_otg_chrg_vbus(0); + set_host_mode(); + langwell_otg_phy_low_power(1); + iotg->otg.state = OTG_STATE_A_IDLE; + langwell_update_transceiver(); + } else if (iotg->hsm.b_sess_vld) { + langwell_otg_chrg_vbus(0); + if (lnw->iotg.start_peripheral) { + lnw->iotg.start_peripheral(&lnw->iotg); + iotg->otg.state = OTG_STATE_B_PERIPHERAL; + } else + dev_dbg(lnw->dev, "client driver not loaded\n"); + } + break; + case OTG_STATE_B_PERIPHERAL: + if (!iotg->hsm.id) { + iotg->otg.default_a = 1; + iotg->hsm.a_srp_det = 0; + + langwell_otg_chrg_vbus(0); + + if (lnw->iotg.stop_peripheral) + lnw->iotg.stop_peripheral(&lnw->iotg); + else + dev_dbg(lnw->dev, + "client driver has been removed.\n"); + + set_host_mode(); + langwell_otg_phy_low_power(1); + iotg->otg.state = OTG_STATE_A_IDLE; + langwell_update_transceiver(); + } else if (!iotg->hsm.b_sess_vld) { + iotg->hsm.b_hnp_enable = 0; + + if (lnw->iotg.stop_peripheral) + lnw->iotg.stop_peripheral(&lnw->iotg); + else + dev_dbg(lnw->dev, + "client driver has been removed.\n"); + + iotg->otg.state = OTG_STATE_B_IDLE; + } else if (iotg->hsm.b_bus_req && iotg->otg.gadget && + iotg->otg.gadget->b_hnp_enable && + iotg->hsm.a_bus_suspend) { + + if (lnw->iotg.stop_peripheral) + lnw->iotg.stop_peripheral(&lnw->iotg); + else + dev_dbg(lnw->dev, + "client driver has been removed.\n"); + + langwell_otg_HAAR(1); + iotg->hsm.a_conn = 0; + + if (lnw->iotg.start_host) { + lnw->iotg.start_host(&lnw->iotg); + iotg->otg.state = OTG_STATE_B_WAIT_ACON; + } else + dev_dbg(lnw->dev, + "host driver not loaded.\n"); + + iotg->hsm.a_bus_resume = 0; + langwell_otg_add_ktimer(TB_ASE0_BRST_TMR); + } + break; + + case OTG_STATE_B_WAIT_ACON: + if (!iotg->hsm.id) { + /* delete hsm timer for b_ase0_brst_tmr */ + del_timer_sync(&lnw->hsm_timer); + + iotg->otg.default_a = 1; + iotg->hsm.a_srp_det = 0; + + langwell_otg_chrg_vbus(0); + + langwell_otg_HAAR(0); + if (lnw->iotg.stop_host) + lnw->iotg.stop_host(&lnw->iotg); + else + dev_dbg(lnw->dev, + "host driver has been removed.\n"); + + set_host_mode(); + langwell_otg_phy_low_power(1); + iotg->otg.state = OTG_STATE_A_IDLE; + langwell_update_transceiver(); + } else if (!iotg->hsm.b_sess_vld) { + /* delete hsm timer for b_ase0_brst_tmr */ + del_timer_sync(&lnw->hsm_timer); + + iotg->hsm.b_hnp_enable = 0; + iotg->hsm.b_bus_req = 0; + + langwell_otg_chrg_vbus(0); + langwell_otg_HAAR(0); + + if (lnw->iotg.stop_host) + lnw->iotg.stop_host(&lnw->iotg); + else + dev_dbg(lnw->dev, + "host driver has been removed.\n"); + + set_client_mode(); + langwell_otg_phy_low_power(1); + iotg->otg.state = OTG_STATE_B_IDLE; + } else if (iotg->hsm.a_conn) { + /* delete hsm timer for b_ase0_brst_tmr */ + del_timer_sync(&lnw->hsm_timer); + + langwell_otg_HAAR(0); + iotg->otg.state = OTG_STATE_B_HOST; + langwell_update_transceiver(); + } else if (iotg->hsm.a_bus_resume || + iotg->hsm.b_ase0_brst_tmout) { + /* delete hsm timer for b_ase0_brst_tmr */ + del_timer_sync(&lnw->hsm_timer); + + langwell_otg_HAAR(0); + langwell_otg_nsf_msg(7); + + if (lnw->iotg.stop_host) + lnw->iotg.stop_host(&lnw->iotg); + else + dev_dbg(lnw->dev, + "host driver has been removed.\n"); + + iotg->hsm.a_bus_suspend = 0; + iotg->hsm.b_bus_req = 0; + + if (lnw->iotg.start_peripheral) + lnw->iotg.start_peripheral(&lnw->iotg); + else + dev_dbg(lnw->dev, + "client driver not loaded.\n"); + + iotg->otg.state = OTG_STATE_B_PERIPHERAL; + } + break; + + case OTG_STATE_B_HOST: + if (!iotg->hsm.id) { + iotg->otg.default_a = 1; + iotg->hsm.a_srp_det = 0; + + langwell_otg_chrg_vbus(0); + + if (lnw->iotg.stop_host) + lnw->iotg.stop_host(&lnw->iotg); + else + dev_dbg(lnw->dev, + "host driver has been removed.\n"); + + set_host_mode(); + langwell_otg_phy_low_power(1); + iotg->otg.state = OTG_STATE_A_IDLE; + langwell_update_transceiver(); + } else if (!iotg->hsm.b_sess_vld) { + iotg->hsm.b_hnp_enable = 0; + iotg->hsm.b_bus_req = 0; + + langwell_otg_chrg_vbus(0); + if (lnw->iotg.stop_host) + lnw->iotg.stop_host(&lnw->iotg); + else + dev_dbg(lnw->dev, + "host driver has been removed.\n"); + + set_client_mode(); + langwell_otg_phy_low_power(1); + iotg->otg.state = OTG_STATE_B_IDLE; + } else if ((!iotg->hsm.b_bus_req) || + (!iotg->hsm.a_conn)) { + iotg->hsm.b_bus_req = 0; + langwell_otg_loc_sof(0); + + if (lnw->iotg.stop_host) + lnw->iotg.stop_host(&lnw->iotg); + else + dev_dbg(lnw->dev, + "host driver has been removed.\n"); + + iotg->hsm.a_bus_suspend = 0; + + if (lnw->iotg.start_peripheral) + lnw->iotg.start_peripheral(&lnw->iotg); + else + dev_dbg(lnw->dev, + "client driver not loaded.\n"); + + iotg->otg.state = OTG_STATE_B_PERIPHERAL; + } + break; + + case OTG_STATE_A_IDLE: + iotg->otg.default_a = 1; + if (iotg->hsm.id) { + iotg->otg.default_a = 0; + iotg->hsm.b_bus_req = 0; + iotg->hsm.vbus_srp_up = 0; + + langwell_otg_chrg_vbus(0); + set_client_mode(); + langwell_otg_phy_low_power(1); + iotg->otg.state = OTG_STATE_B_IDLE; + langwell_update_transceiver(); + } else if (!iotg->hsm.a_bus_drop && + (iotg->hsm.a_srp_det || iotg->hsm.a_bus_req)) { + langwell_otg_phy_low_power(0); + + /* Turn on VBus */ + iotg->otg.set_vbus(&iotg->otg, true); + + iotg->hsm.vbus_srp_up = 0; + iotg->hsm.a_wait_vrise_tmout = 0; + langwell_otg_add_timer(a_wait_vrise_tmr); + iotg->otg.state = OTG_STATE_A_WAIT_VRISE; + langwell_update_transceiver(); + } else if (!iotg->hsm.a_bus_drop && iotg->hsm.a_sess_vld) { + iotg->hsm.vbus_srp_up = 1; + } else if (!iotg->hsm.a_sess_vld && iotg->hsm.vbus_srp_up) { + msleep(10); + langwell_otg_phy_low_power(0); + + /* Turn on VBus */ + iotg->otg.set_vbus(&iotg->otg, true); + iotg->hsm.a_srp_det = 1; + iotg->hsm.vbus_srp_up = 0; + iotg->hsm.a_wait_vrise_tmout = 0; + langwell_otg_add_timer(a_wait_vrise_tmr); + iotg->otg.state = OTG_STATE_A_WAIT_VRISE; + langwell_update_transceiver(); + } else if (!iotg->hsm.a_sess_vld && + !iotg->hsm.vbus_srp_up) { + langwell_otg_phy_low_power(1); + } + break; + case OTG_STATE_A_WAIT_VRISE: + if (iotg->hsm.id) { + langwell_otg_del_timer(a_wait_vrise_tmr); + iotg->hsm.b_bus_req = 0; + iotg->otg.default_a = 0; + + /* Turn off VBus */ + iotg->otg.set_vbus(&iotg->otg, false); + set_client_mode(); + langwell_otg_phy_low_power_wait(1); + iotg->otg.state = OTG_STATE_B_IDLE; + } else if (iotg->hsm.a_vbus_vld) { + langwell_otg_del_timer(a_wait_vrise_tmr); + iotg->hsm.b_conn = 0; + if (lnw->iotg.start_host) + lnw->iotg.start_host(&lnw->iotg); + else { + dev_dbg(lnw->dev, "host driver not loaded.\n"); + break; + } + + langwell_otg_add_ktimer(TA_WAIT_BCON_TMR); + iotg->otg.state = OTG_STATE_A_WAIT_BCON; + } else if (iotg->hsm.a_wait_vrise_tmout) { + iotg->hsm.b_conn = 0; + if (iotg->hsm.a_vbus_vld) { + if (lnw->iotg.start_host) + lnw->iotg.start_host(&lnw->iotg); + else { + dev_dbg(lnw->dev, + "host driver not loaded.\n"); + break; + } + langwell_otg_add_ktimer(TA_WAIT_BCON_TMR); + iotg->otg.state = OTG_STATE_A_WAIT_BCON; + } else { + + /* Turn off VBus */ + iotg->otg.set_vbus(&iotg->otg, false); + langwell_otg_phy_low_power_wait(1); + iotg->otg.state = OTG_STATE_A_VBUS_ERR; + } + } + break; + case OTG_STATE_A_WAIT_BCON: + if (iotg->hsm.id) { + /* delete hsm timer for a_wait_bcon_tmr */ + del_timer_sync(&lnw->hsm_timer); + + iotg->otg.default_a = 0; + iotg->hsm.b_bus_req = 0; + + if (lnw->iotg.stop_host) + lnw->iotg.stop_host(&lnw->iotg); + else + dev_dbg(lnw->dev, + "host driver has been removed.\n"); + + /* Turn off VBus */ + iotg->otg.set_vbus(&iotg->otg, false); + set_client_mode(); + langwell_otg_phy_low_power_wait(1); + iotg->otg.state = OTG_STATE_B_IDLE; + langwell_update_transceiver(); + } else if (!iotg->hsm.a_vbus_vld) { + /* delete hsm timer for a_wait_bcon_tmr */ + del_timer_sync(&lnw->hsm_timer); + + if (lnw->iotg.stop_host) + lnw->iotg.stop_host(&lnw->iotg); + else + dev_dbg(lnw->dev, + "host driver has been removed.\n"); + + /* Turn off VBus */ + iotg->otg.set_vbus(&iotg->otg, false); + langwell_otg_phy_low_power_wait(1); + iotg->otg.state = OTG_STATE_A_VBUS_ERR; + } else if (iotg->hsm.a_bus_drop || + (iotg->hsm.a_wait_bcon_tmout && + !iotg->hsm.a_bus_req)) { + /* delete hsm timer for a_wait_bcon_tmr */ + del_timer_sync(&lnw->hsm_timer); + + if (lnw->iotg.stop_host) + lnw->iotg.stop_host(&lnw->iotg); + else + dev_dbg(lnw->dev, + "host driver has been removed.\n"); + + /* Turn off VBus */ + iotg->otg.set_vbus(&iotg->otg, false); + iotg->otg.state = OTG_STATE_A_WAIT_VFALL; + } else if (iotg->hsm.b_conn) { + /* delete hsm timer for a_wait_bcon_tmr */ + del_timer_sync(&lnw->hsm_timer); + + iotg->hsm.a_suspend_req = 0; + iotg->otg.state = OTG_STATE_A_HOST; + if (iotg->hsm.a_srp_det && iotg->otg.host && + !iotg->otg.host->b_hnp_enable) { + /* SRP capable peripheral-only device */ + iotg->hsm.a_bus_req = 1; + iotg->hsm.a_srp_det = 0; + } else if (!iotg->hsm.a_bus_req && iotg->otg.host && + iotg->otg.host->b_hnp_enable) { + /* It is not safe enough to do a fast + * transistion from A_WAIT_BCON to + * A_SUSPEND */ + msleep(10000); + if (iotg->hsm.a_bus_req) + break; + + if (request_irq(pdev->irq, + otg_dummy_irq, IRQF_SHARED, + driver_name, iotg->base) != 0) { + dev_dbg(lnw->dev, + "request interrupt %d fail\n", + pdev->irq); + } + + langwell_otg_HABA(1); + iotg->hsm.b_bus_resume = 0; + iotg->hsm.a_aidl_bdis_tmout = 0; + + langwell_otg_loc_sof(0); + /* clear PHCD to enable HW timer */ + langwell_otg_phy_low_power(0); + langwell_otg_add_timer(a_aidl_bdis_tmr); + iotg->otg.state = OTG_STATE_A_SUSPEND; + } else if (!iotg->hsm.a_bus_req && iotg->otg.host && + !iotg->otg.host->b_hnp_enable) { + if (lnw->iotg.stop_host) + lnw->iotg.stop_host(&lnw->iotg); + else + dev_dbg(lnw->dev, + "host driver removed.\n"); + + /* Turn off VBus */ + iotg->otg.set_vbus(&iotg->otg, false); + iotg->otg.state = OTG_STATE_A_WAIT_VFALL; + } + } + break; + case OTG_STATE_A_HOST: + if (iotg->hsm.id) { + iotg->otg.default_a = 0; + iotg->hsm.b_bus_req = 0; + + if (lnw->iotg.stop_host) + lnw->iotg.stop_host(&lnw->iotg); + else + dev_dbg(lnw->dev, + "host driver has been removed.\n"); + + /* Turn off VBus */ + iotg->otg.set_vbus(&iotg->otg, false); + set_client_mode(); + langwell_otg_phy_low_power_wait(1); + iotg->otg.state = OTG_STATE_B_IDLE; + langwell_update_transceiver(); + } else if (iotg->hsm.a_bus_drop || + (iotg->otg.host && + !iotg->otg.host->b_hnp_enable && + !iotg->hsm.a_bus_req)) { + if (lnw->iotg.stop_host) + lnw->iotg.stop_host(&lnw->iotg); + else + dev_dbg(lnw->dev, + "host driver has been removed.\n"); + + /* Turn off VBus */ + iotg->otg.set_vbus(&iotg->otg, false); + iotg->otg.state = OTG_STATE_A_WAIT_VFALL; + } else if (!iotg->hsm.a_vbus_vld) { + if (lnw->iotg.stop_host) + lnw->iotg.stop_host(&lnw->iotg); + else + dev_dbg(lnw->dev, + "host driver has been removed.\n"); + + /* Turn off VBus */ + iotg->otg.set_vbus(&iotg->otg, false); + langwell_otg_phy_low_power_wait(1); + iotg->otg.state = OTG_STATE_A_VBUS_ERR; + } else if (iotg->otg.host && + iotg->otg.host->b_hnp_enable && + !iotg->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(pdev->irq, otg_dummy_irq, IRQF_SHARED, + driver_name, iotg->base) != 0) { + dev_dbg(lnw->dev, + "request interrupt %d failed\n", + pdev->irq); + } + + /* set HABA */ + langwell_otg_HABA(1); + iotg->hsm.b_bus_resume = 0; + iotg->hsm.a_aidl_bdis_tmout = 0; + langwell_otg_loc_sof(0); + /* clear PHCD to enable HW timer */ + langwell_otg_phy_low_power(0); + langwell_otg_add_timer(a_aidl_bdis_tmr); + iotg->otg.state = OTG_STATE_A_SUSPEND; + } else if (!iotg->hsm.b_conn || !iotg->hsm.a_bus_req) { + langwell_otg_add_ktimer(TA_WAIT_BCON_TMR); + iotg->otg.state = OTG_STATE_A_WAIT_BCON; + } + break; + case OTG_STATE_A_SUSPEND: + if (iotg->hsm.id) { + langwell_otg_del_timer(a_aidl_bdis_tmr); + langwell_otg_HABA(0); + free_irq(pdev->irq, iotg->base); + iotg->otg.default_a = 0; + iotg->hsm.b_bus_req = 0; + + if (lnw->iotg.stop_host) + lnw->iotg.stop_host(&lnw->iotg); + else + dev_dbg(lnw->dev, + "host driver has been removed.\n"); + + /* Turn off VBus */ + iotg->otg.set_vbus(&iotg->otg, false); + set_client_mode(); + langwell_otg_phy_low_power(1); + iotg->otg.state = OTG_STATE_B_IDLE; + langwell_update_transceiver(); + } else if (iotg->hsm.a_bus_req || + iotg->hsm.b_bus_resume) { + langwell_otg_del_timer(a_aidl_bdis_tmr); + langwell_otg_HABA(0); + free_irq(pdev->irq, iotg->base); + iotg->hsm.a_suspend_req = 0; + langwell_otg_loc_sof(1); + iotg->otg.state = OTG_STATE_A_HOST; + } else if (iotg->hsm.a_aidl_bdis_tmout || + iotg->hsm.a_bus_drop) { + langwell_otg_del_timer(a_aidl_bdis_tmr); + langwell_otg_HABA(0); + free_irq(pdev->irq, iotg->base); + if (lnw->iotg.stop_host) + lnw->iotg.stop_host(&lnw->iotg); + else + dev_dbg(lnw->dev, + "host driver has been removed.\n"); + + /* Turn off VBus */ + iotg->otg.set_vbus(&iotg->otg, false); + iotg->otg.state = OTG_STATE_A_WAIT_VFALL; + } else if (!iotg->hsm.b_conn && iotg->otg.host && + iotg->otg.host->b_hnp_enable) { + langwell_otg_del_timer(a_aidl_bdis_tmr); + langwell_otg_HABA(0); + free_irq(pdev->irq, iotg->base); + + if (lnw->iotg.stop_host) + lnw->iotg.stop_host(&lnw->iotg); + else + dev_dbg(lnw->dev, + "host driver has been removed.\n"); + + iotg->hsm.b_bus_suspend = 0; + iotg->hsm.b_bus_suspend_vld = 0; + + /* msleep(200); */ + if (lnw->iotg.start_peripheral) + lnw->iotg.start_peripheral(&lnw->iotg); + else + dev_dbg(lnw->dev, + "client driver not loaded.\n"); + + langwell_otg_add_ktimer(TB_BUS_SUSPEND_TMR); + iotg->otg.state = OTG_STATE_A_PERIPHERAL; + break; + } else if (!iotg->hsm.a_vbus_vld) { + langwell_otg_del_timer(a_aidl_bdis_tmr); + langwell_otg_HABA(0); + free_irq(pdev->irq, iotg->base); + if (lnw->iotg.stop_host) + lnw->iotg.stop_host(&lnw->iotg); + else + dev_dbg(lnw->dev, + "host driver has been removed.\n"); + + /* Turn off VBus */ + iotg->otg.set_vbus(&iotg->otg, false); + langwell_otg_phy_low_power_wait(1); + iotg->otg.state = OTG_STATE_A_VBUS_ERR; + } + break; + case OTG_STATE_A_PERIPHERAL: + if (iotg->hsm.id) { + /* delete hsm timer for b_bus_suspend_tmr */ + del_timer_sync(&lnw->hsm_timer); + iotg->otg.default_a = 0; + iotg->hsm.b_bus_req = 0; + if (lnw->iotg.stop_peripheral) + lnw->iotg.stop_peripheral(&lnw->iotg); + else + dev_dbg(lnw->dev, + "client driver has been removed.\n"); + + /* Turn off VBus */ + iotg->otg.set_vbus(&iotg->otg, false); + set_client_mode(); + langwell_otg_phy_low_power_wait(1); + iotg->otg.state = OTG_STATE_B_IDLE; + langwell_update_transceiver(); + } else if (!iotg->hsm.a_vbus_vld) { + /* delete hsm timer for b_bus_suspend_tmr */ + del_timer_sync(&lnw->hsm_timer); + + if (lnw->iotg.stop_peripheral) + lnw->iotg.stop_peripheral(&lnw->iotg); + else + dev_dbg(lnw->dev, + "client driver has been removed.\n"); + + /* Turn off VBus */ + iotg->otg.set_vbus(&iotg->otg, false); + langwell_otg_phy_low_power_wait(1); + iotg->otg.state = OTG_STATE_A_VBUS_ERR; + } else if (iotg->hsm.a_bus_drop) { + /* delete hsm timer for b_bus_suspend_tmr */ + del_timer_sync(&lnw->hsm_timer); + + if (lnw->iotg.stop_peripheral) + lnw->iotg.stop_peripheral(&lnw->iotg); + else + dev_dbg(lnw->dev, + "client driver has been removed.\n"); + + /* Turn off VBus */ + iotg->otg.set_vbus(&iotg->otg, false); + iotg->otg.state = OTG_STATE_A_WAIT_VFALL; + } else if (iotg->hsm.b_bus_suspend) { + /* delete hsm timer for b_bus_suspend_tmr */ + del_timer_sync(&lnw->hsm_timer); + + if (lnw->iotg.stop_peripheral) + lnw->iotg.stop_peripheral(&lnw->iotg); + else + dev_dbg(lnw->dev, + "client driver has been removed.\n"); + + if (lnw->iotg.start_host) + lnw->iotg.start_host(&lnw->iotg); + else + dev_dbg(lnw->dev, + "host driver not loaded.\n"); + langwell_otg_add_ktimer(TA_WAIT_BCON_TMR); + iotg->otg.state = OTG_STATE_A_WAIT_BCON; + } else if (iotg->hsm.b_bus_suspend_tmout) { + u32 val; + val = readl(lnw->iotg.base + CI_PORTSC1); + if (!(val & PORTSC_SUSP)) + break; + + if (lnw->iotg.stop_peripheral) + lnw->iotg.stop_peripheral(&lnw->iotg); + else + dev_dbg(lnw->dev, + "client driver has been removed.\n"); + + if (lnw->iotg.start_host) + lnw->iotg.start_host(&lnw->iotg); + else + dev_dbg(lnw->dev, + "host driver not loaded.\n"); + langwell_otg_add_ktimer(TA_WAIT_BCON_TMR); + iotg->otg.state = OTG_STATE_A_WAIT_BCON; + } + break; + case OTG_STATE_A_VBUS_ERR: + if (iotg->hsm.id) { + iotg->otg.default_a = 0; + iotg->hsm.a_clr_err = 0; + iotg->hsm.a_srp_det = 0; + set_client_mode(); + langwell_otg_phy_low_power(1); + iotg->otg.state = OTG_STATE_B_IDLE; + langwell_update_transceiver(); + } else if (iotg->hsm.a_clr_err) { + iotg->hsm.a_clr_err = 0; + iotg->hsm.a_srp_det = 0; + reset_otg(); + init_hsm(); + if (iotg->otg.state == OTG_STATE_A_IDLE) + langwell_update_transceiver(); + } else { + /* FW will clear PHCD bit when any VBus + * event detected. Reset PHCD to 1 again */ + langwell_otg_phy_low_power(1); + } + break; + case OTG_STATE_A_WAIT_VFALL: + if (iotg->hsm.id) { + iotg->otg.default_a = 0; + set_client_mode(); + langwell_otg_phy_low_power(1); + iotg->otg.state = OTG_STATE_B_IDLE; + langwell_update_transceiver(); + } else if (iotg->hsm.a_bus_req) { + + /* Turn on VBus */ + iotg->otg.set_vbus(&iotg->otg, true); + iotg->hsm.a_wait_vrise_tmout = 0; + langwell_otg_add_timer(a_wait_vrise_tmr); + iotg->otg.state = OTG_STATE_A_WAIT_VRISE; + } else if (!iotg->hsm.a_sess_vld) { + iotg->hsm.a_srp_det = 0; + set_host_mode(); + langwell_otg_phy_low_power(1); + iotg->otg.state = OTG_STATE_A_IDLE; + } + break; + default: + ; + } + + dev_dbg(lnw->dev, "%s: new state = %s\n", __func__, + state_string(iotg->otg.state)); +} + +static ssize_t +show_registers(struct device *_dev, struct device_attribute *attr, char *buf) +{ + struct langwell_otg *lnw = the_transceiver; + char *next; + unsigned size, t; + + 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(lnw->iotg.base + 0x30), + readl(lnw->iotg.base + 0x34), + readl(lnw->iotg.base + 0x38), + readl(lnw->iotg.base + 0x48), + readl(lnw->iotg.base + 0x74), + readl(lnw->iotg.base + 0xb4), + readl(lnw->iotg.base + 0xf4), + readl(lnw->iotg.base + 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 *lnw = the_transceiver; + struct intel_mid_otg_xceiv *iotg = &lnw->iotg; + char *next; + unsigned size, t; + + next = buf; + size = PAGE_SIZE; + + if (iotg->otg.host) + iotg->hsm.a_set_b_hnp_en = iotg->otg.host->b_hnp_enable; + + if (iotg->otg.gadget) + iotg->hsm.b_hnp_enable = iotg->otg.gadget->b_hnp_enable; + + 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(iotg->otg.state), + iotg->hsm.a_bus_resume, + iotg->hsm.a_bus_suspend, + iotg->hsm.a_conn, + iotg->hsm.a_sess_vld, + iotg->hsm.a_srp_det, + iotg->hsm.a_vbus_vld, + iotg->hsm.b_bus_resume, + iotg->hsm.b_bus_suspend, + iotg->hsm.b_conn, + iotg->hsm.b_se0_srp, + iotg->hsm.b_sess_end, + iotg->hsm.b_sess_vld, + iotg->hsm.id, + iotg->hsm.a_set_b_hnp_en, + iotg->hsm.b_srp_done, + iotg->hsm.b_hnp_enable, + iotg->hsm.a_wait_vrise_tmout, + iotg->hsm.a_wait_bcon_tmout, + iotg->hsm.a_aidl_bdis_tmout, + iotg->hsm.b_ase0_brst_tmout, + iotg->hsm.a_bus_drop, + iotg->hsm.a_bus_req, + iotg->hsm.a_clr_err, + iotg->hsm.a_suspend_req, + iotg->hsm.b_bus_req, + iotg->hsm.b_bus_suspend_tmout, + iotg->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 *lnw = the_transceiver; + char *next; + unsigned size, t; + + next = buf; + size = PAGE_SIZE; + + t = scnprintf(next, size, "%d", lnw->iotg.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 *lnw = the_transceiver; + struct intel_mid_otg_xceiv *iotg = &lnw->iotg; + + if (!iotg->otg.default_a) + return -1; + if (count > 2) + return -1; + + if (buf[0] == '0') { + iotg->hsm.a_bus_req = 0; + dev_dbg(lnw->dev, "User request: a_bus_req = 0\n"); + } else if (buf[0] == '1') { + /* If a_bus_drop is TRUE, a_bus_req can't be set */ + if (iotg->hsm.a_bus_drop) + return -1; + iotg->hsm.a_bus_req = 1; + dev_dbg(lnw->dev, "User request: a_bus_req = 1\n"); + } + if (spin_trylock(&lnw->wq_lock)) { + langwell_update_transceiver(); + spin_unlock(&lnw->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 *lnw = the_transceiver; + char *next; + unsigned size, t; + + next = buf; + size = PAGE_SIZE; + + t = scnprintf(next, size, "%d", lnw->iotg.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 *lnw = the_transceiver; + struct intel_mid_otg_xceiv *iotg = &lnw->iotg; + + if (!iotg->otg.default_a) + return -1; + if (count > 2) + return -1; + + if (buf[0] == '0') { + iotg->hsm.a_bus_drop = 0; + dev_dbg(lnw->dev, "User request: a_bus_drop = 0\n"); + } else if (buf[0] == '1') { + iotg->hsm.a_bus_drop = 1; + iotg->hsm.a_bus_req = 0; + dev_dbg(lnw->dev, "User request: a_bus_drop = 1\n"); + dev_dbg(lnw->dev, "User request: and a_bus_req = 0\n"); + } + if (spin_trylock(&lnw->wq_lock)) { + langwell_update_transceiver(); + spin_unlock(&lnw->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 *lnw = the_transceiver; + char *next; + unsigned size, t; + + next = buf; + size = PAGE_SIZE; + + t = scnprintf(next, size, "%d", lnw->iotg.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 *lnw = the_transceiver; + struct intel_mid_otg_xceiv *iotg = &lnw->iotg; + + if (iotg->otg.default_a) + return -1; + + if (count > 2) + return -1; + + if (buf[0] == '0') { + iotg->hsm.b_bus_req = 0; + dev_dbg(lnw->dev, "User request: b_bus_req = 0\n"); + } else if (buf[0] == '1') { + iotg->hsm.b_bus_req = 1; + dev_dbg(lnw->dev, "User request: b_bus_req = 1\n"); + } + if (spin_trylock(&lnw->wq_lock)) { + langwell_update_transceiver(); + spin_unlock(&lnw->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 *lnw = the_transceiver; + struct intel_mid_otg_xceiv *iotg = &lnw->iotg; + + if (!iotg->otg.default_a) + return -1; + if (count > 2) + return -1; + + if (buf[0] == '1') { + iotg->hsm.a_clr_err = 1; + dev_dbg(lnw->dev, "User request: a_clr_err = 1\n"); + } + if (spin_trylock(&lnw->wq_lock)) { + langwell_update_transceiver(); + spin_unlock(&lnw->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, +}; + +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 *lnw; + char qname[] = "langwell_otg_queue"; + + retval = 0; + dev_dbg(&pdev->dev, "\notg controller is detected.\n"); + if (pci_enable_device(pdev) < 0) { + retval = -ENODEV; + goto done; + } + + lnw = kzalloc(sizeof *lnw, GFP_KERNEL); + if (lnw == NULL) { + retval = -ENOMEM; + goto done; + } + the_transceiver = lnw; + + /* 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; + } + lnw->region = 1; + + base = ioremap_nocache(resource, len); + if (base == NULL) { + retval = -EFAULT; + goto err; + } + lnw->iotg.base = base; + + if (!request_mem_region(USBCFG_ADDR, USBCFG_LEN, driver_name)) { + retval = -EBUSY; + goto err; + } + lnw->cfg_region = 1; + + /* For the SCCB.USBCFG register */ + base = ioremap_nocache(USBCFG_ADDR, USBCFG_LEN); + if (base == NULL) { + retval = -EFAULT; + goto err; + } + lnw->usbcfg = base; + + if (!pdev->irq) { + dev_dbg(&pdev->dev, "No IRQ.\n"); + retval = -ENODEV; + goto err; + } + + lnw->qwork = create_singlethread_workqueue(qname); + if (!lnw->qwork) { + dev_dbg(&pdev->dev, "cannot create workqueue %s\n", qname); + retval = -ENOMEM; + goto err; + } + INIT_WORK(&lnw->work, langwell_otg_work); + + /* OTG common part */ + lnw->dev = &pdev->dev; + lnw->iotg.otg.dev = lnw->dev; + lnw->iotg.otg.label = driver_name; + lnw->iotg.otg.set_host = langwell_otg_set_host; + lnw->iotg.otg.set_peripheral = langwell_otg_set_peripheral; + lnw->iotg.otg.set_power = langwell_otg_set_power; + lnw->iotg.otg.set_vbus = langwell_otg_set_vbus; + lnw->iotg.otg.start_srp = langwell_otg_start_srp; + lnw->iotg.otg.state = OTG_STATE_UNDEFINED; + + if (otg_set_transceiver(&lnw->iotg.otg)) { + dev_dbg(lnw->dev, "can't set transceiver\n"); + retval = -EBUSY; + goto err; + } + + reset_otg(); + init_hsm(); + + spin_lock_init(&lnw->lock); + spin_lock_init(&lnw->wq_lock); + INIT_LIST_HEAD(&active_timers); + retval = langwell_otg_init_timers(&lnw->iotg.hsm); + if (retval) { + dev_dbg(&pdev->dev, "Failed to init timers\n"); + goto err; + } + + init_timer(&lnw->hsm_timer); + ATOMIC_INIT_NOTIFIER_HEAD(&lnw->iotg.iotg_notifier); + + lnw->iotg_notifier.notifier_call = langwell_otg_iotg_notify; + + retval = intel_mid_otg_register_notifier(&lnw->iotg, + &lnw->iotg_notifier); + if (retval) { + dev_dbg(lnw->dev, "Failed to register notifier\n"); + goto err; + } + + if (request_irq(pdev->irq, otg_irq, IRQF_SHARED, + driver_name, lnw) != 0) { + dev_dbg(lnw->dev, "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, lnw->iotg.base + CI_OTGSC); + + retval = device_create_file(&pdev->dev, &dev_attr_registers); + if (retval < 0) { + dev_dbg(lnw->dev, + "Can't register sysfs attribute: %d\n", retval); + goto err; + } + + retval = device_create_file(&pdev->dev, &dev_attr_hsm); + if (retval < 0) { + dev_dbg(lnw->dev, "Can't hsm sysfs attribute: %d\n", retval); + goto err; + } + + retval = sysfs_create_group(&pdev->dev.kobj, &debug_dev_attr_group); + if (retval < 0) { + dev_dbg(lnw->dev, + "Can't register sysfs attr group: %d\n", retval); + goto err; + } + + if (lnw->iotg.otg.state == OTG_STATE_A_IDLE) + langwell_update_transceiver(); + + 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 *lnw = the_transceiver; + + if (lnw->qwork) { + flush_workqueue(lnw->qwork); + destroy_workqueue(lnw->qwork); + } + intel_mid_otg_unregister_notifier(&lnw->iotg, &lnw->iotg_notifier); + langwell_otg_free_timers(); + + /* disable OTGSC interrupt as OTGSC doesn't change in reset */ + writel(0, lnw->iotg.base + CI_OTGSC); + + if (pdev->irq) + free_irq(pdev->irq, lnw); + if (lnw->usbcfg) + iounmap(lnw->usbcfg); + if (lnw->cfg_region) + release_mem_region(USBCFG_ADDR, USBCFG_LEN); + if (lnw->iotg.base) + iounmap(lnw->iotg.base); + if (lnw->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(lnw); + lnw = 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) +{ + struct langwell_otg *lnw = the_transceiver; + struct intel_mid_otg_xceiv *iotg = &lnw->iotg; + int ret = 0; + + /* Disbale OTG interrupts */ + langwell_otg_intr(0); + + if (pdev->irq) + free_irq(pdev->irq, lnw); + + /* Prevent more otg_work */ + flush_workqueue(lnw->qwork); + destroy_workqueue(lnw->qwork); + lnw->qwork = NULL; + + /* start actions */ + switch (iotg->otg.state) { + case OTG_STATE_A_WAIT_VFALL: + iotg->otg.state = OTG_STATE_A_IDLE; + case OTG_STATE_A_IDLE: + case OTG_STATE_B_IDLE: + case OTG_STATE_A_VBUS_ERR: + transceiver_suspend(pdev); + break; + case OTG_STATE_A_WAIT_VRISE: + langwell_otg_del_timer(a_wait_vrise_tmr); + iotg->hsm.a_srp_det = 0; + + /* Turn off VBus */ + iotg->otg.set_vbus(&iotg->otg, false); + iotg->otg.state = OTG_STATE_A_IDLE; + transceiver_suspend(pdev); + break; + case OTG_STATE_A_WAIT_BCON: + del_timer_sync(&lnw->hsm_timer); + if (lnw->iotg.stop_host) + lnw->iotg.stop_host(&lnw->iotg); + else + dev_dbg(&pdev->dev, "host driver has been removed.\n"); + + iotg->hsm.a_srp_det = 0; + + /* Turn off VBus */ + iotg->otg.set_vbus(&iotg->otg, false); + iotg->otg.state = OTG_STATE_A_IDLE; + transceiver_suspend(pdev); + break; + case OTG_STATE_A_HOST: + if (lnw->iotg.stop_host) + lnw->iotg.stop_host(&lnw->iotg); + else + dev_dbg(&pdev->dev, "host driver has been removed.\n"); + + iotg->hsm.a_srp_det = 0; + + /* Turn off VBus */ + iotg->otg.set_vbus(&iotg->otg, false); + + iotg->otg.state = OTG_STATE_A_IDLE; + transceiver_suspend(pdev); + break; + case OTG_STATE_A_SUSPEND: + langwell_otg_del_timer(a_aidl_bdis_tmr); + langwell_otg_HABA(0); + if (lnw->iotg.stop_host) + lnw->iotg.stop_host(&lnw->iotg); + else + dev_dbg(lnw->dev, "host driver has been removed.\n"); + iotg->hsm.a_srp_det = 0; + + /* Turn off VBus */ + iotg->otg.set_vbus(&iotg->otg, false); + iotg->otg.state = OTG_STATE_A_IDLE; + transceiver_suspend(pdev); + break; + case OTG_STATE_A_PERIPHERAL: + del_timer_sync(&lnw->hsm_timer); + + if (lnw->iotg.stop_peripheral) + lnw->iotg.stop_peripheral(&lnw->iotg); + else + dev_dbg(&pdev->dev, + "client driver has been removed.\n"); + iotg->hsm.a_srp_det = 0; + + /* Turn off VBus */ + iotg->otg.set_vbus(&iotg->otg, false); + iotg->otg.state = OTG_STATE_A_IDLE; + transceiver_suspend(pdev); + break; + case OTG_STATE_B_HOST: + if (lnw->iotg.stop_host) + lnw->iotg.stop_host(&lnw->iotg); + else + dev_dbg(&pdev->dev, "host driver has been removed.\n"); + iotg->hsm.b_bus_req = 0; + iotg->otg.state = OTG_STATE_B_IDLE; + transceiver_suspend(pdev); + break; + case OTG_STATE_B_PERIPHERAL: + if (lnw->iotg.stop_peripheral) + lnw->iotg.stop_peripheral(&lnw->iotg); + else + dev_dbg(&pdev->dev, + "client driver has been removed.\n"); + iotg->otg.state = OTG_STATE_B_IDLE; + transceiver_suspend(pdev); + break; + case OTG_STATE_B_WAIT_ACON: + /* delete hsm timer for b_ase0_brst_tmr */ + del_timer_sync(&lnw->hsm_timer); + + langwell_otg_HAAR(0); + + if (lnw->iotg.stop_host) + lnw->iotg.stop_host(&lnw->iotg); + else + dev_dbg(&pdev->dev, "host driver has been removed.\n"); + iotg->hsm.b_bus_req = 0; + iotg->otg.state = OTG_STATE_B_IDLE; + transceiver_suspend(pdev); + break; + default: + dev_dbg(lnw->dev, "error state before suspend\n"); + break; + } + + return ret; +} + +static void transceiver_resume(struct pci_dev *pdev) +{ + pci_restore_state(pdev); + pci_set_power_state(pdev, PCI_D0); +} + +static int langwell_otg_resume(struct pci_dev *pdev) +{ + struct langwell_otg *lnw = the_transceiver; + int ret = 0; + + transceiver_resume(pdev); + + lnw->qwork = create_singlethread_workqueue("langwell_otg_queue"); + if (!lnw->qwork) { + dev_dbg(&pdev->dev, "cannot create langwell otg workqueuen"); + ret = -ENOMEM; + goto error; + } + + if (request_irq(pdev->irq, otg_irq, IRQF_SHARED, + driver_name, lnw) != 0) { + dev_dbg(&pdev->dev, "request interrupt %d failed\n", pdev->irq); + ret = -EBUSY; + goto error; + } + + /* enable OTG interrupts */ + langwell_otg_intr(1); + + update_hsm(); + + langwell_update_transceiver(); + + return ret; +error: + langwell_otg_intr(0); + transceiver_suspend(pdev); + 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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