--- /dev/null
+/*
+ * 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/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 "3.0.0.32L.0003"
+
+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);
projects / firefly-linux-kernel-4.4.55.git / commitdiff