diff options
Diffstat (limited to 'drivers/usb/musb/stm_musb.c')
| -rw-r--r-- | drivers/usb/musb/stm_musb.c | 638 |
1 files changed, 638 insertions, 0 deletions
diff --git a/drivers/usb/musb/stm_musb.c b/drivers/usb/musb/stm_musb.c new file mode 100644 index 00000000000..5ce3c4a75dc --- /dev/null +++ b/drivers/usb/musb/stm_musb.c @@ -0,0 +1,638 @@ +/* + * Copyright (C) 2009 STMicroelectronics + * Copyright (C) 2009 ST-Ericsson SA + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +/** @file stm_musb.c + * @brief This file contains the USB controller and Phy initialization + * with default as interrupt mode was implemented + */ +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/init.h> +#include <linux/list.h> +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/gpio.h> +#include <linux/delay.h> +#include <linux/mfd/ab8500/ab8500-bm.h> +#include <mach/stm_musb.h> +#include <mach/musb_db8500.h> +#include <mach/prcmu-fw-api.h> +#include "musb_core.h" + +static u8 ulpi_read_register(struct musb *musb, u8 address); +static u8 ulpi_write_register(struct musb *musb, u8 address, u8 data); +/* callback argument for AB8500 callback functions */ +static struct musb *musb_status; +static spinlock_t musb_ulpi_spinlock; +static unsigned musb_power; +#ifdef CONFIG_USB_OTG_20 +static int userrequest; +#endif +static struct workqueue_struct *stm_usb_power_wq; +static struct work_struct stm_prcmu_qos; +static int musb_qos_req; + +#define PERI5_CLK_ENABLE 1 +#define PERI5_CLK_DISABLE 0 + +/** + * musb_set_session() - Start the USB session + * + * This function is used to start the USB sessios in USB host mode + * once the A cable is plugged in + */ +void musb_set_session(void) +{ + u8 val; + void __iomem *regs; + + if (musb_status == NULL) { + printk(KERN_ERR "Error: devctl session cannot be set\n"); + return; + } + regs = musb_status->mregs; + val = musb_readb(regs, MUSB_DEVCTL); + musb_writeb(regs, MUSB_DEVCTL, val | MUSB_DEVCTL_SESSION); +} +EXPORT_SYMBOL(musb_set_session); + + +void stm_prcmu_qos_handler(int value) +{ + if (value) + musb_qos_req = 100; + else + musb_qos_req = 50; + queue_work(stm_usb_power_wq, &stm_prcmu_qos); +} +EXPORT_SYMBOL(stm_prcmu_qos_handler); + +static void stm_prcmu_qos_work(struct work_struct *work) +{ + if (musb_qos_req == 100) { + prcmu_qos_update_requirement(PRCMU_QOS_APE_OPP, + "musb_qos", 100); + } else { + prcmu_qos_update_requirement(PRCMU_QOS_APE_OPP, + "musb_qos", 50); + prcmu_release_usb_wakeup_state(); + } +} + +void stm_set_peripheral_clock(int enable) +{ + if (enable) { + if (musb_status->set_clock) + musb_status->set_clock(musb_status->clock, 1); + else + clk_enable(musb_status->clock); + } else { + if (musb_status->set_clock) + musb_status->set_clock(musb_status->clock, 0); + else + clk_disable(musb_status->clock); + } +} + +#ifdef CONFIG_PM +void stm_musb_context(int enable) +{ + void __iomem *regs; + + if (enable) { + stm_set_peripheral_clock(PERI5_CLK_ENABLE); + musb_restore_context(musb_status); + regs = musb_status->mregs; + } else + stm_set_peripheral_clock(PERI5_CLK_DISABLE); +} +EXPORT_SYMBOL(stm_musb_context); +#endif + +void +ab8500_bm_usb_state_changed_wrapper(u8 bm_usb_state) +{ + if ((bm_usb_state == AB8500_BM_USB_STATE_RESET_HS) || + (bm_usb_state == AB8500_BM_USB_STATE_RESET_FS)) { + musb_power = 0; + } + + /* + * TODO: Instead of using callbacks, we should be using notify + * to tell the battery manager when there is s state change + */ + ab8500_charger_usb_state_changed(bm_usb_state, musb_power); +} + +#ifdef CONFIG_USB_OTG_20 +int musb_adp(void) +{ + if (userrequest == 0) + return 0; + else + return 1; +} +EXPORT_SYMBOL(musb_adp); +#endif + +/* Sys interfaces */ +static struct kobject *usbstatus_kobj; +static ssize_t usb_cable_status + (struct kobject *kobj, struct attribute *attr, char *buf) +{ + u8 is_active = 0; + + if (strcmp(attr->name, "cable_connect") == 0) { + is_active = musb_status->is_active; + sprintf(buf, "%d\n", is_active); + } + return strlen(buf); +} + +static struct attribute usb_cable_connect_attribute = \ + {.name = "cable_connect", .mode = S_IRUGO}; +static struct attribute *usb_status[] = { + &usb_cable_connect_attribute, + NULL +}; + +struct sysfs_ops usb_sysfs_ops = { + .show = usb_cable_status, +}; + +static struct kobj_type ktype_usbstatus = { + .sysfs_ops = &usb_sysfs_ops, + .default_attrs = usb_status, +}; + +/* + * A structure was declared as global for timer in USB host mode + */ +static struct timer_list notify_timer; + +/* TODO: Remove or use!! */ +#ifdef UNUSED_USB_STUFF + +/** + * ulpi_read_register() - Read the usb register from address writing into ULPI + * @musb: struct musb pointer. + * @address: address for reading from ULPI register of USB + * + * This function read the value from the specific address in USB host mode. + */ +static u8 ulpi_read_register(struct musb *musb, u8 address) +{ + void __iomem *mbase = musb->mregs; + unsigned long flags; + int count = 200; + u8 val; + + spin_lock_irqsave(&musb_ulpi_spinlock, flags); + + /* set ULPI register address */ + musb_writeb(mbase, OTG_UREGADDR, address); + + /* request a read access */ + val = musb_readb(mbase, OTG_UREGCTRL); + val |= OTG_UREGCTRL_URW; + musb_writeb(mbase, OTG_UREGCTRL, val); + + /* perform access */ + val = musb_readb(mbase, OTG_UREGCTRL); + val |= OTG_UREGCTRL_REGREQ; + musb_writeb(mbase, OTG_UREGCTRL, val); + + /* wait for completion with a time-out */ + do { + udelay(10); + val = musb_readb(mbase, OTG_UREGCTRL); + count--; + } while (!(val & OTG_UREGCTRL_REGCMP) && (count > 0)); + + /* check for time-out */ + if (!(val & OTG_UREGCTRL_REGCMP) && (count == 0)) { + spin_unlock_irqrestore(&musb_ulpi_spinlock, flags); + if (printk_ratelimit()) + printk(KERN_ALERT "U8500 USB : ULPI read timed out\n"); + return 0; + } + + /* acknowledge completion */ + val &= ~OTG_UREGCTRL_REGCMP; + musb_writeb(mbase, OTG_UREGCTRL, val); + + /* get data */ + val = musb_readb(mbase, OTG_UREGDATA); + spin_unlock_irqrestore(&musb_ulpi_spinlock, flags); + + return val; +} +#endif + +/** + * ulpi_write_register() - Write to a usb phy's ULPI register + * using the Mentor ULPI wrapper functionality + * @musb: struct musb pointer. + * @address: address of ULPI register + * @data: data for ULPI register + * This function writes the value given by data to the specific address + */ +static u8 ulpi_write_register(struct musb *musb, u8 address, u8 data) +{ + void __iomem *mbase = musb->mregs; + unsigned long flags; + int count = 200; + u8 val; + + spin_lock_irqsave(&musb_ulpi_spinlock, flags); + + /* First write to ULPI wrapper registers */ + /* set ULPI register address */ + musb_writeb(mbase, OTG_UREGADDR, address); + + /* request a write access */ + val = musb_readb(mbase, OTG_UREGCTRL); + val &= ~OTG_UREGCTRL_URW; + musb_writeb(mbase, OTG_UREGCTRL, val); + + /* Write data to ULPI wrapper data register */ + musb_writeb(mbase, OTG_UREGDATA, data); + + /* perform access */ + val = musb_readb(mbase, OTG_UREGCTRL); + val |= OTG_UREGCTRL_REGREQ; + musb_writeb(mbase, OTG_UREGCTRL, val); + + /* wait for completion with a time-out */ + do { + udelay(10); + val = musb_readb(mbase, OTG_UREGCTRL); + count--; + } while (!(val & OTG_UREGCTRL_REGCMP) && (count > 0)); + + /* check for time-out */ + if (!(val & OTG_UREGCTRL_REGCMP) && (count == 0)) { + spin_unlock_irqrestore(&musb_ulpi_spinlock, flags); + if (printk_ratelimit()) + printk(KERN_ALERT "U8500 USB : ULPI write timed out\n"); + return 0; + } + + /* acknowledge completion */ + val &= ~OTG_UREGCTRL_REGCMP; + musb_writeb(mbase, OTG_UREGCTRL, val); + + spin_unlock_irqrestore(&musb_ulpi_spinlock, flags); + + return 0; + +} + + +/** + * musb_stm_hs_otg_init() - Initialize the USB for paltform specific. + * @musb: struct musb pointer. + * + * This function initialize the USB with the given musb structure information. + */ +int __init musb_stm_hs_otg_init(struct musb *musb) +{ + u8 val; + + if (musb->clock) + clk_enable(musb->clock); + + /* enable ULPI interface */ + val = musb_readb(musb->mregs, OTG_TOPCTRL); + val |= OTG_TOPCTRL_MODE_ULPI; + musb_writeb(musb->mregs, OTG_TOPCTRL, val); + + /* do soft reset */ + val = musb_readb(musb->mregs, 0x7F); + val |= 0x2; + musb_writeb(musb->mregs, 0x7F, val); + + return 0; +} +/** + * musb_stm_fs_init() - Initialize the file system for the USB. + * @musb: struct musb pointer. + * + * This function initialize the file system of USB. + */ +int __init musb_stm_fs_init(struct musb *musb) +{ + return 0; +} +/** + * musb_platform_enable() - Enable the USB. + * @musb: struct musb pointer. + * + * This function enables the USB. + */ +void musb_platform_enable(struct musb *musb) +{ +} +/** + * musb_platform_disable() - Disable the USB. + * @musb: struct musb pointer. + * + * This function disables the USB. + */ +void musb_platform_disable(struct musb *musb) +{ +} + +/** + * musb_platform_try_idle() - Check the USB state active or not. + * @musb: struct musb pointer. + * @timeout: set the timeout to keep the host in idle mode. + * + * This function keeps the USB host in idle state based on the musb inforamtion. + */ +void musb_platform_try_idle(struct musb *musb, unsigned long timeout) +{ + if (musb->board_mode != MUSB_PERIPHERAL) { + unsigned long default_timeout = + jiffies + msecs_to_jiffies(10); + static unsigned long last_timer; + + if (timeout == 0) + timeout = default_timeout; + + /* Never idle if active, or when VBUS + timeout is not set as host */ + if (musb->is_active || ((musb->a_wait_bcon == 0) + && (musb->xceiv->state == OTG_STATE_A_WAIT_BCON))) { + DBG(4, "%s active, deleting timer\n", + otg_state_string(musb)); + del_timer(¬ify_timer); + last_timer = jiffies; + return; + } + + if (time_after(last_timer, timeout)) { + if (!timer_pending(¬ify_timer)) + last_timer = timeout; + else { + DBG(4, + "Longer idle timer already pending,ignoring\n"); + return; + } + } + last_timer = timeout; + + DBG(4, "%s inactive, for idle timer for %lu ms\n", + otg_state_string(musb), + (unsigned long)jiffies_to_msecs(timeout - jiffies)); + mod_timer(¬ify_timer, timeout); + } +} + +/** + * set_vbus() - Set the Vbus for the USB. + * @musb: struct musb pointer. + * @is_on: set Vbus for USB or not. + * + * This function set the Vbus for USB. + */ +static void set_vbus(struct musb *musb, int is_on) +{ + u8 devctl; + /* HDRC controls CPEN, but beware current surges during device + * connect. They can trigger transient overcurrent conditions + * that must be ignored. + */ + + devctl = musb_readb(musb->mregs, MUSB_DEVCTL); + + if (is_on) { + musb->is_active = 1; + musb->xceiv->default_a = 1; + musb->xceiv->state = OTG_STATE_A_WAIT_VRISE; + devctl |= MUSB_DEVCTL_SESSION; + + MUSB_HST_MODE(musb); + } else { + musb->is_active = 0; + + /* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and + * jumping right to B_IDLE... + */ + + musb->xceiv->default_a = 0; + musb->xceiv->state = OTG_STATE_B_IDLE; + devctl &= ~MUSB_DEVCTL_SESSION; + + MUSB_DEV_MODE(musb); + } + musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); + + DBG(1, "VBUS %s, devctl %02x " + /* otg %3x conf %08x prcm %08x */ "\n", + otg_state_string(musb), + musb_readb(musb->mregs, MUSB_DEVCTL)); + if (!is_on) { + /* Discahrge the VBUS */ + if (musb_status == NULL) + return; + ulpi_write_register(musb_status, ULPI_OCTRL, 0x08); + } +} +/** + * set_power() - Set the power for the USB transceiver. + * @x: struct usb_transceiver pointer. + * @mA: set mA power for USB. + * + * This function set the power for the USB. + */ +static int set_power(struct otg_transceiver *x, unsigned mA) +{ + if (mA > 100) { + /* AB V2 has eye diagram issues when drawing more + * than 100mA from VBUS.So setting charging current + * to 100mA in case of standard host + */ + if (musb_get_abx500_rev() < 0x30) + mA = 100; + else + mA = 300; + } + musb_power = mA; + DBG(1, "Set VBUS Power = %d mA\n", mA); + ab8500_bm_usb_state_changed_wrapper( + AB8500_BM_USB_STATE_CONFIGURED); + return 0; +} +/** + * musb_platform_set_mode() - Set the mode for the USB driver. + * @musb: struct musb pointer. + * @musb_mode: usb mode. + * + * This function set the mode for the USB. + */ +int musb_platform_set_mode(struct musb *musb, u8 musb_mode) +{ + u8 devctl = musb_readb(musb->mregs, MUSB_DEVCTL); + + devctl |= MUSB_DEVCTL_SESSION; + musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); + + switch (musb_mode) { + case MUSB_HOST: + otg_set_host(musb->xceiv, musb->xceiv->host); + break; + case MUSB_PERIPHERAL: + otg_set_peripheral(musb->xceiv, musb->xceiv->gadget); + break; + case MUSB_OTG: + break; + default: + return -EINVAL; + } + return 0; +} +/** + * funct_host_notify_timer() - Initialize the timer for USB host driver. + * @data: usb host data. + * + * This function runs the timer for the USB host mode. + */ +static void funct_host_notify_timer(unsigned long data) +{ + struct musb *musb = (void *)data; + unsigned long flags; + u8 devctl; + + spin_lock_irqsave(&musb->lock, flags); + + devctl = musb_readb(musb->mregs, MUSB_DEVCTL); + + switch (musb->xceiv->state) { + case OTG_STATE_A_WAIT_BCON: + devctl &= ~MUSB_DEVCTL_SESSION; + musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); + + devctl = musb_readb(musb->mregs, MUSB_DEVCTL); + if (devctl & MUSB_DEVCTL_BDEVICE) { + musb->xceiv->state = OTG_STATE_B_IDLE; + MUSB_DEV_MODE(musb); + } else { + musb->xceiv->state = OTG_STATE_A_IDLE; + MUSB_HST_MODE(musb); + } +#ifdef CONFIG_PM + stm_musb_context(USB_DISABLE); +#endif + + break; + default: + break; + } + spin_unlock_irqrestore(&musb->lock, flags); + DBG(1, "otg_state %s devctl %d\n", otg_state_string(musb), devctl); +} + +/** + * musb_platform_init() - Initialize the platform USB driver. + * @musb: struct musb pointer. + * + * This function initialize the USB controller and Phy. + */ +int __init musb_platform_init(struct musb *musb, void *board_data) +{ + int ret; + + usb_nop_xceiv_register(); + + musb->xceiv = otg_get_transceiver(); + if (!musb->xceiv) { + pr_err("U8500 USB : no transceiver configured\n"); + ret = -ENODEV; + goto done; + } + + ret = musb_stm_hs_otg_init(musb); + if (ret < 0) + goto done; + if (is_host_enabled(musb)) + musb->board_set_vbus = set_vbus; + if (is_peripheral_enabled(musb)) + musb->xceiv->set_power = set_power; + + ret = musb_phy_en(musb->board_mode); + if (ret < 0) + goto done; + + if (musb_status == NULL) { + musb_status = musb; + spin_lock_init(&musb_ulpi_spinlock); + } + + /* Registering usb device for sysfs */ + usbstatus_kobj = kzalloc(sizeof(struct kobject), GFP_KERNEL); + + if (usbstatus_kobj == NULL) + ret = -ENOMEM; + usbstatus_kobj->ktype = &ktype_usbstatus; + kobject_init(usbstatus_kobj, usbstatus_kobj->ktype); + + ret = kobject_set_name(usbstatus_kobj, "usb_status"); + if (ret) + kfree(usbstatus_kobj); + + ret = kobject_add(usbstatus_kobj, NULL, "usb_status"); + if (ret) + kfree(usbstatus_kobj); + + if (musb->board_mode != MUSB_PERIPHERAL) { + init_timer(¬ify_timer); + notify_timer.expires = jiffies + msecs_to_jiffies(1000); + notify_timer.function = funct_host_notify_timer; + notify_timer.data = (unsigned long)musb; + add_timer(¬ify_timer); + } + + stm_usb_power_wq = create_singlethread_workqueue( + "stm_usb_power_wq"); + if (stm_usb_power_wq == NULL) + return -ENOMEM; + + INIT_WORK(&stm_prcmu_qos, stm_prcmu_qos_work); + + ret = musb_force_detect(musb->board_mode); + if (ret < 0) + goto done; + return 0; + +done: + usb_nop_xceiv_unregister(); + return ret; +} +/** + * musb_platform_exit() - unregister the platform USB driver. + * @musb: struct musb pointer. + * + * This function unregisters the USB controller. + */ +int musb_platform_exit(struct musb *musb) +{ + musb->clock = 0; + + if (musb->board_mode != MUSB_PERIPHERAL) + del_timer_sync(¬ify_timer); + + usb_nop_xceiv_unregister(); + + musb_status = NULL; + + return 0; +} |