diff options
Diffstat (limited to 'drivers/usb/otg/isp1301_omap.c')
| -rw-r--r-- | drivers/usb/otg/isp1301_omap.c | 1683 |
1 files changed, 1683 insertions, 0 deletions
diff --git a/drivers/usb/otg/isp1301_omap.c b/drivers/usb/otg/isp1301_omap.c new file mode 100644 index 000000000000..e0d56ef2bcb0 --- /dev/null +++ b/drivers/usb/otg/isp1301_omap.c @@ -0,0 +1,1683 @@ +/* + * isp1301_omap - ISP 1301 USB transceiver, talking to OMAP OTG controller + * + * Copyright (C) 2004 Texas Instruments + * Copyright (C) 2004 David Brownell + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/gpio.h> +#include <linux/usb/ch9.h> +#include <linux/usb/gadget.h> +#include <linux/usb.h> +#include <linux/usb/otg.h> +#include <linux/i2c.h> +#include <linux/workqueue.h> + +#include <asm/irq.h> +#include <asm/mach-types.h> + +#include <mach/usb.h> +#include <mach/mux.h> + + +#ifndef DEBUG +#undef VERBOSE +#endif + + +#define DRIVER_VERSION "24 August 2004" +#define DRIVER_NAME (isp1301_driver.driver.name) + +MODULE_DESCRIPTION("ISP1301 USB OTG Transceiver Driver"); +MODULE_LICENSE("GPL"); + +struct isp1301 { + struct otg_transceiver otg; + struct i2c_client *client; + void (*i2c_release)(struct device *dev); + + int irq_type; + + u32 last_otg_ctrl; + unsigned working:1; + + struct timer_list timer; + + /* use keventd context to change the state for us */ + struct work_struct work; + + unsigned long todo; +# define WORK_UPDATE_ISP 0 /* update ISP from OTG */ +# define WORK_UPDATE_OTG 1 /* update OTG from ISP */ +# define WORK_HOST_RESUME 4 /* resume host */ +# define WORK_TIMER 6 /* timer fired */ +# define WORK_STOP 7 /* don't resubmit */ +}; + + +/* bits in OTG_CTRL */ + +#define OTG_XCEIV_OUTPUTS \ + (OTG_ASESSVLD|OTG_BSESSEND|OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID) +#define OTG_XCEIV_INPUTS \ + (OTG_PULLDOWN|OTG_PULLUP|OTG_DRV_VBUS|OTG_PD_VBUS|OTG_PU_VBUS|OTG_PU_ID) +#define OTG_CTRL_BITS \ + (OTG_A_BUSREQ|OTG_A_SETB_HNPEN|OTG_B_BUSREQ|OTG_B_HNPEN|OTG_BUSDROP) + /* and OTG_PULLUP is sometimes written */ + +#define OTG_CTRL_MASK (OTG_DRIVER_SEL| \ + OTG_XCEIV_OUTPUTS|OTG_XCEIV_INPUTS| \ + OTG_CTRL_BITS) + + +/*-------------------------------------------------------------------------*/ + +/* board-specific PM hooks */ + +#if defined(CONFIG_MACH_OMAP_H2) || defined(CONFIG_MACH_OMAP_H3) + +#if defined(CONFIG_TPS65010) || defined(CONFIG_TPS65010_MODULE) + +#include <linux/i2c/tps65010.h> + +#else + +static inline int tps65010_set_vbus_draw(unsigned mA) +{ + pr_debug("tps65010: draw %d mA (STUB)\n", mA); + return 0; +} + +#endif + +static void enable_vbus_draw(struct isp1301 *isp, unsigned mA) +{ + int status = tps65010_set_vbus_draw(mA); + if (status < 0) + pr_debug(" VBUS %d mA error %d\n", mA, status); +} + +static void enable_vbus_source(struct isp1301 *isp) +{ + /* this board won't supply more than 8mA vbus power. + * some boards can switch a 100ma "unit load" (or more). + */ +} + + +/* products will deliver OTG messages with LEDs, GUI, etc */ +static inline void notresponding(struct isp1301 *isp) +{ + printk(KERN_NOTICE "OTG device not responding.\n"); +} + + +#endif + +#if defined(CONFIG_MACH_OMAP_H4) + +static void enable_vbus_draw(struct isp1301 *isp, unsigned mA) +{ + /* H4 controls this by DIP switch S2.4; no soft control. + * ON means the charger is always enabled. Leave it OFF + * unless the OTG port is used only in B-peripheral mode. + */ +} + +static void enable_vbus_source(struct isp1301 *isp) +{ + /* this board won't supply more than 8mA vbus power. + * some boards can switch a 100ma "unit load" (or more). + */ +} + + +/* products will deliver OTG messages with LEDs, GUI, etc */ +static inline void notresponding(struct isp1301 *isp) +{ + printk(KERN_NOTICE "OTG device not responding.\n"); +} + + +#endif + +/*-------------------------------------------------------------------------*/ + +static struct i2c_driver isp1301_driver; + +/* smbus apis are used for portability */ + +static inline u8 +isp1301_get_u8(struct isp1301 *isp, u8 reg) +{ + return i2c_smbus_read_byte_data(isp->client, reg + 0); +} + +static inline int +isp1301_get_u16(struct isp1301 *isp, u8 reg) +{ + return i2c_smbus_read_word_data(isp->client, reg); +} + +static inline int +isp1301_set_bits(struct isp1301 *isp, u8 reg, u8 bits) +{ + return i2c_smbus_write_byte_data(isp->client, reg + 0, bits); +} + +static inline int +isp1301_clear_bits(struct isp1301 *isp, u8 reg, u8 bits) +{ + return i2c_smbus_write_byte_data(isp->client, reg + 1, bits); +} + +/*-------------------------------------------------------------------------*/ + +/* identification */ +#define ISP1301_VENDOR_ID 0x00 /* u16 read */ +#define ISP1301_PRODUCT_ID 0x02 /* u16 read */ +#define ISP1301_BCD_DEVICE 0x14 /* u16 read */ + +#define I2C_VENDOR_ID_PHILIPS 0x04cc +#define I2C_PRODUCT_ID_PHILIPS_1301 0x1301 + +/* operational registers */ +#define ISP1301_MODE_CONTROL_1 0x04 /* u8 read, set, +1 clear */ +# define MC1_SPEED (1 << 0) +# define MC1_SUSPEND (1 << 1) +# define MC1_DAT_SE0 (1 << 2) +# define MC1_TRANSPARENT (1 << 3) +# define MC1_BDIS_ACON_EN (1 << 4) +# define MC1_OE_INT_EN (1 << 5) +# define MC1_UART_EN (1 << 6) +# define MC1_MASK 0x7f +#define ISP1301_MODE_CONTROL_2 0x12 /* u8 read, set, +1 clear */ +# define MC2_GLOBAL_PWR_DN (1 << 0) +# define MC2_SPD_SUSP_CTRL (1 << 1) +# define MC2_BI_DI (1 << 2) +# define MC2_TRANSP_BDIR0 (1 << 3) +# define MC2_TRANSP_BDIR1 (1 << 4) +# define MC2_AUDIO_EN (1 << 5) +# define MC2_PSW_EN (1 << 6) +# define MC2_EN2V7 (1 << 7) +#define ISP1301_OTG_CONTROL_1 0x06 /* u8 read, set, +1 clear */ +# define OTG1_DP_PULLUP (1 << 0) +# define OTG1_DM_PULLUP (1 << 1) +# define OTG1_DP_PULLDOWN (1 << 2) +# define OTG1_DM_PULLDOWN (1 << 3) +# define OTG1_ID_PULLDOWN (1 << 4) +# define OTG1_VBUS_DRV (1 << 5) +# define OTG1_VBUS_DISCHRG (1 << 6) +# define OTG1_VBUS_CHRG (1 << 7) +#define ISP1301_OTG_STATUS 0x10 /* u8 readonly */ +# define OTG_B_SESS_END (1 << 6) +# define OTG_B_SESS_VLD (1 << 7) + +#define ISP1301_INTERRUPT_SOURCE 0x08 /* u8 read */ +#define ISP1301_INTERRUPT_LATCH 0x0A /* u8 read, set, +1 clear */ + +#define ISP1301_INTERRUPT_FALLING 0x0C /* u8 read, set, +1 clear */ +#define ISP1301_INTERRUPT_RISING 0x0E /* u8 read, set, +1 clear */ + +/* same bitfields in all interrupt registers */ +# define INTR_VBUS_VLD (1 << 0) +# define INTR_SESS_VLD (1 << 1) +# define INTR_DP_HI (1 << 2) +# define INTR_ID_GND (1 << 3) +# define INTR_DM_HI (1 << 4) +# define INTR_ID_FLOAT (1 << 5) +# define INTR_BDIS_ACON (1 << 6) +# define INTR_CR_INT (1 << 7) + +/*-------------------------------------------------------------------------*/ + +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"; + } +} + +static inline const char *state_name(struct isp1301 *isp) +{ + return state_string(isp->otg.state); +} + +/*-------------------------------------------------------------------------*/ + +/* NOTE: some of this ISP1301 setup is specific to H2 boards; + * not everything is guarded by board-specific checks, or even using + * omap_usb_config data to deduce MC1_DAT_SE0 and MC2_BI_DI. + * + * ALSO: this currently doesn't use ISP1301 low-power modes + * while OTG is running. + */ + +static void power_down(struct isp1301 *isp) +{ + isp->otg.state = OTG_STATE_UNDEFINED; + + // isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN); + isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND); + + isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_ID_PULLDOWN); + isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0); +} + +static void power_up(struct isp1301 *isp) +{ + // isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN); + isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND); + + /* do this only when cpu is driving transceiver, + * so host won't see a low speed device... + */ + isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0); +} + +#define NO_HOST_SUSPEND + +static int host_suspend(struct isp1301 *isp) +{ +#ifdef NO_HOST_SUSPEND + return 0; +#else + struct device *dev; + + if (!isp->otg.host) + return -ENODEV; + + /* Currently ASSUMES only the OTG port matters; + * other ports could be active... + */ + dev = isp->otg.host->controller; + return dev->driver->suspend(dev, 3, 0); +#endif +} + +static int host_resume(struct isp1301 *isp) +{ +#ifdef NO_HOST_SUSPEND + return 0; +#else + struct device *dev; + + if (!isp->otg.host) + return -ENODEV; + + dev = isp->otg.host->controller; + return dev->driver->resume(dev, 0); +#endif +} + +static int gadget_suspend(struct isp1301 *isp) +{ + isp->otg.gadget->b_hnp_enable = 0; + isp->otg.gadget->a_hnp_support = 0; + isp->otg.gadget->a_alt_hnp_support = 0; + return usb_gadget_vbus_disconnect(isp->otg.gadget); +} + +/*-------------------------------------------------------------------------*/ + +#define TIMER_MINUTES 10 +#define TIMER_JIFFIES (TIMER_MINUTES * 60 * HZ) + +/* Almost all our I2C messaging comes from a work queue's task context. + * NOTE: guaranteeing certain response times might mean we shouldn't + * share keventd's work queue; a realtime task might be safest. + */ +static void isp1301_defer_work(struct isp1301 *isp, int work) +{ + int status; + + if (isp && !test_and_set_bit(work, &isp->todo)) { + (void) get_device(&isp->client->dev); + status = schedule_work(&isp->work); + if (!status && !isp->working) + dev_vdbg(&isp->client->dev, + "work item %d may be lost\n", work); + } +} + +/* called from irq handlers */ +static void a_idle(struct isp1301 *isp, const char *tag) +{ + u32 l; + + if (isp->otg.state == OTG_STATE_A_IDLE) + return; + + isp->otg.default_a = 1; + if (isp->otg.host) { + isp->otg.host->is_b_host = 0; + host_suspend(isp); + } + if (isp->otg.gadget) { + isp->otg.gadget->is_a_peripheral = 1; + gadget_suspend(isp); + } + isp->otg.state = OTG_STATE_A_IDLE; + l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS; + omap_writel(l, OTG_CTRL); + isp->last_otg_ctrl = l; + pr_debug(" --> %s/%s\n", state_name(isp), tag); +} + +/* called from irq handlers */ +static void b_idle(struct isp1301 *isp, const char *tag) +{ + u32 l; + + if (isp->otg.state == OTG_STATE_B_IDLE) + return; + + isp->otg.default_a = 0; + if (isp->otg.host) { + isp->otg.host->is_b_host = 1; + host_suspend(isp); + } + if (isp->otg.gadget) { + isp->otg.gadget->is_a_peripheral = 0; + gadget_suspend(isp); + } + isp->otg.state = OTG_STATE_B_IDLE; + l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS; + omap_writel(l, OTG_CTRL); + isp->last_otg_ctrl = l; + pr_debug(" --> %s/%s\n", state_name(isp), tag); +} + +static void +dump_regs(struct isp1301 *isp, const char *label) +{ +#ifdef DEBUG + u8 ctrl = isp1301_get_u8(isp, ISP1301_OTG_CONTROL_1); + u8 status = isp1301_get_u8(isp, ISP1301_OTG_STATUS); + u8 src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE); + + pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n", + omap_readl(OTG_CTRL), label, state_name(isp), + ctrl, status, src); + /* mode control and irq enables don't change much */ +#endif +} + +/*-------------------------------------------------------------------------*/ + +#ifdef CONFIG_USB_OTG + +/* + * The OMAP OTG controller handles most of the OTG state transitions. + * + * We translate isp1301 outputs (mostly voltage comparator status) into + * OTG inputs; OTG outputs (mostly pullup/pulldown controls) and HNP state + * flags into isp1301 inputs ... and infer state transitions. + */ + +#ifdef VERBOSE + +static void check_state(struct isp1301 *isp, const char *tag) +{ + enum usb_otg_state state = OTG_STATE_UNDEFINED; + u8 fsm = omap_readw(OTG_TEST) & 0x0ff; + unsigned extra = 0; + + switch (fsm) { + + /* default-b */ + case 0x0: + state = OTG_STATE_B_IDLE; + break; + case 0x3: + case 0x7: + extra = 1; + case 0x1: + state = OTG_STATE_B_PERIPHERAL; + break; + case 0x11: + state = OTG_STATE_B_SRP_INIT; + break; + + /* extra dual-role default-b states */ + case 0x12: + case 0x13: + case 0x16: + extra = 1; + case 0x17: + state = OTG_STATE_B_WAIT_ACON; + break; + case 0x34: + state = OTG_STATE_B_HOST; + break; + + /* default-a */ + case 0x36: + state = OTG_STATE_A_IDLE; + break; + case 0x3c: + state = OTG_STATE_A_WAIT_VFALL; + break; + case 0x7d: + state = OTG_STATE_A_VBUS_ERR; + break; + case 0x9e: + case 0x9f: + extra = 1; + case 0x89: + state = OTG_STATE_A_PERIPHERAL; + break; + case 0xb7: + state = OTG_STATE_A_WAIT_VRISE; + break; + case 0xb8: + state = OTG_STATE_A_WAIT_BCON; + break; + case 0xb9: + state = OTG_STATE_A_HOST; + break; + case 0xba: + state = OTG_STATE_A_SUSPEND; + break; + default: + break; + } + if (isp->otg.state == state && !extra) + return; + pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag, + state_string(state), fsm, state_name(isp), + omap_readl(OTG_CTRL)); +} + +#else + +static inline void check_state(struct isp1301 *isp, const char *tag) { } + +#endif + +/* outputs from ISP1301_INTERRUPT_SOURCE */ +static void update_otg1(struct isp1301 *isp, u8 int_src) +{ + u32 otg_ctrl; + + otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK; + otg_ctrl &= ~OTG_XCEIV_INPUTS; + otg_ctrl &= ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD); + + if (int_src & INTR_SESS_VLD) + otg_ctrl |= OTG_ASESSVLD; + else if (isp->otg.state == OTG_STATE_A_WAIT_VFALL) { + a_idle(isp, "vfall"); + otg_ctrl &= ~OTG_CTRL_BITS; + } + if (int_src & INTR_VBUS_VLD) + otg_ctrl |= OTG_VBUSVLD; + if (int_src & INTR_ID_GND) { /* default-A */ + if (isp->otg.state == OTG_STATE_B_IDLE + || isp->otg.state == OTG_STATE_UNDEFINED) { + a_idle(isp, "init"); + return; + } + } else { /* default-B */ + otg_ctrl |= OTG_ID; + if (isp->otg.state == OTG_STATE_A_IDLE + || isp->otg.state == OTG_STATE_UNDEFINED) { + b_idle(isp, "init"); + return; + } + } + omap_writel(otg_ctrl, OTG_CTRL); +} + +/* outputs from ISP1301_OTG_STATUS */ +static void update_otg2(struct isp1301 *isp, u8 otg_status) +{ + u32 otg_ctrl; + + otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK; + otg_ctrl &= ~OTG_XCEIV_INPUTS; + otg_ctrl &= ~(OTG_BSESSVLD | OTG_BSESSEND); + if (otg_status & OTG_B_SESS_VLD) + otg_ctrl |= OTG_BSESSVLD; + else if (otg_status & OTG_B_SESS_END) + otg_ctrl |= OTG_BSESSEND; + omap_writel(otg_ctrl, OTG_CTRL); +} + +/* inputs going to ISP1301 */ +static void otg_update_isp(struct isp1301 *isp) +{ + u32 otg_ctrl, otg_change; + u8 set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP; + + otg_ctrl = omap_readl(OTG_CTRL); + otg_change = otg_ctrl ^ isp->last_otg_ctrl; + isp->last_otg_ctrl = otg_ctrl; + otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS; + + switch (isp->otg.state) { + case OTG_STATE_B_IDLE: + case OTG_STATE_B_PERIPHERAL: + case OTG_STATE_B_SRP_INIT: + if (!(otg_ctrl & OTG_PULLUP)) { + // if (otg_ctrl & OTG_B_HNPEN) { + if (isp->otg.gadget->b_hnp_enable) { + isp->otg.state = OTG_STATE_B_WAIT_ACON; + pr_debug(" --> b_wait_acon\n"); + } + goto pulldown; + } +pullup: + set |= OTG1_DP_PULLUP; + clr |= OTG1_DP_PULLDOWN; + break; + case OTG_STATE_A_SUSPEND: + case OTG_STATE_A_PERIPHERAL: + if (otg_ctrl & OTG_PULLUP) + goto pullup; + /* FALLTHROUGH */ + // case OTG_STATE_B_WAIT_ACON: + default: +pulldown: + set |= OTG1_DP_PULLDOWN; + clr |= OTG1_DP_PULLUP; + break; + } + +# define toggle(OTG,ISP) do { \ + if (otg_ctrl & OTG) set |= ISP; \ + else clr |= ISP; \ + } while (0) + + if (!(isp->otg.host)) + otg_ctrl &= ~OTG_DRV_VBUS; + + switch (isp->otg.state) { + case OTG_STATE_A_SUSPEND: + if (otg_ctrl & OTG_DRV_VBUS) { + set |= OTG1_VBUS_DRV; + break; + } + /* HNP failed for some reason (A_AIDL_BDIS timeout) */ + notresponding(isp); + + /* FALLTHROUGH */ + case OTG_STATE_A_VBUS_ERR: + isp->otg.state = OTG_STATE_A_WAIT_VFALL; + pr_debug(" --> a_wait_vfall\n"); + /* FALLTHROUGH */ + case OTG_STATE_A_WAIT_VFALL: + /* FIXME usbcore thinks port power is still on ... */ + clr |= OTG1_VBUS_DRV; + break; + case OTG_STATE_A_IDLE: + if (otg_ctrl & OTG_DRV_VBUS) { + isp->otg.state = OTG_STATE_A_WAIT_VRISE; + pr_debug(" --> a_wait_vrise\n"); + } + /* FALLTHROUGH */ + default: + toggle(OTG_DRV_VBUS, OTG1_VBUS_DRV); + } + + toggle(OTG_PU_VBUS, OTG1_VBUS_CHRG); + toggle(OTG_PD_VBUS, OTG1_VBUS_DISCHRG); + +# undef toggle + + isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, set); + isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, clr); + + /* HNP switch to host or peripheral; and SRP */ + if (otg_change & OTG_PULLUP) { + u32 l; + + switch (isp->otg.state) { + case OTG_STATE_B_IDLE: + if (clr & OTG1_DP_PULLUP) + break; + isp->otg.state = OTG_STATE_B_PERIPHERAL; + pr_debug(" --> b_peripheral\n"); + break; + case OTG_STATE_A_SUSPEND: + if (clr & OTG1_DP_PULLUP) + break; + isp->otg.state = OTG_STATE_A_PERIPHERAL; + pr_debug(" --> a_peripheral\n"); + break; + default: + break; + } + l = omap_readl(OTG_CTRL); + l |= OTG_PULLUP; + omap_writel(l, OTG_CTRL); + } + + check_state(isp, __func__); + dump_regs(isp, "otg->isp1301"); +} + +static irqreturn_t omap_otg_irq(int irq, void *_isp) +{ + u16 otg_irq = omap_readw(OTG_IRQ_SRC); + u32 otg_ctrl; + int ret = IRQ_NONE; + struct isp1301 *isp = _isp; + + /* update ISP1301 transciever from OTG controller */ + if (otg_irq & OPRT_CHG) { + omap_writew(OPRT_CHG, OTG_IRQ_SRC); + isp1301_defer_work(isp, WORK_UPDATE_ISP); + ret = IRQ_HANDLED; + + /* SRP to become b_peripheral failed */ + } else if (otg_irq & B_SRP_TMROUT) { + pr_debug("otg: B_SRP_TIMEOUT, %06x\n", omap_readl(OTG_CTRL)); + notresponding(isp); + + /* gadget drivers that care should monitor all kinds of + * remote wakeup (SRP, normal) using their own timer + * to give "check cable and A-device" messages. + */ + if (isp->otg.state == OTG_STATE_B_SRP_INIT) + b_idle(isp, "srp_timeout"); + + omap_writew(B_SRP_TMROUT, OTG_IRQ_SRC); + ret = IRQ_HANDLED; + + /* HNP to become b_host failed */ + } else if (otg_irq & B_HNP_FAIL) { + pr_debug("otg: %s B_HNP_FAIL, %06x\n", + state_name(isp), omap_readl(OTG_CTRL)); + notresponding(isp); + + otg_ctrl = omap_readl(OTG_CTRL); + otg_ctrl |= OTG_BUSDROP; + otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS; + omap_writel(otg_ctrl, OTG_CTRL); + + /* subset of b_peripheral()... */ + isp->otg.state = OTG_STATE_B_PERIPHERAL; + pr_debug(" --> b_peripheral\n"); + + omap_writew(B_HNP_FAIL, OTG_IRQ_SRC); + ret = IRQ_HANDLED; + + /* detect SRP from B-device ... */ + } else if (otg_irq & A_SRP_DETECT) { + pr_debug("otg: %s SRP_DETECT, %06x\n", + state_name(isp), omap_readl(OTG_CTRL)); + + isp1301_defer_work(isp, WORK_UPDATE_OTG); + switch (isp->otg.state) { + case OTG_STATE_A_IDLE: + if (!isp->otg.host) + break; + isp1301_defer_work(isp, WORK_HOST_RESUME); + otg_ctrl = omap_readl(OTG_CTRL); + otg_ctrl |= OTG_A_BUSREQ; + otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ) + & ~OTG_XCEIV_INPUTS + & OTG_CTRL_MASK; + omap_writel(otg_ctrl, OTG_CTRL); + break; + default: + break; + } + + omap_writew(A_SRP_DETECT, OTG_IRQ_SRC); + ret = IRQ_HANDLED; + + /* timer expired: T(a_wait_bcon) and maybe T(a_wait_vrise) + * we don't track them separately + */ + } else if (otg_irq & A_REQ_TMROUT) { + otg_ctrl = omap_readl(OTG_CTRL); + pr_info("otg: BCON_TMOUT from %s, %06x\n", + state_name(isp), otg_ctrl); + notresponding(isp); + + otg_ctrl |= OTG_BUSDROP; + otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS; + omap_writel(otg_ctrl, OTG_CTRL); + isp->otg.state = OTG_STATE_A_WAIT_VFALL; + + omap_writew(A_REQ_TMROUT, OTG_IRQ_SRC); + ret = IRQ_HANDLED; + + /* A-supplied voltage fell too low; overcurrent */ + } else if (otg_irq & A_VBUS_ERR) { + otg_ctrl = omap_readl(OTG_CTRL); + printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n", + state_name(isp), otg_irq, otg_ctrl); + + otg_ctrl |= OTG_BUSDROP; + otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS; + omap_writel(otg_ctrl, OTG_CTRL); + isp->otg.state = OTG_STATE_A_VBUS_ERR; + + omap_writew(A_VBUS_ERR, OTG_IRQ_SRC); + ret = IRQ_HANDLED; + + /* switch driver; the transciever code activates it, + * ungating the udc clock or resuming OHCI. + */ + } else if (otg_irq & DRIVER_SWITCH) { + int kick = 0; + + otg_ctrl = omap_readl(OTG_CTRL); + printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n", + state_name(isp), + (otg_ctrl & OTG_DRIVER_SEL) + ? "gadget" : "host", + otg_ctrl); + isp1301_defer_work(isp, WORK_UPDATE_ISP); + + /* role is peripheral */ + if (otg_ctrl & OTG_DRIVER_SEL) { + switch (isp->otg.state) { + case OTG_STATE_A_IDLE: + b_idle(isp, __func__); + break; + default: + break; + } + isp1301_defer_work(isp, WORK_UPDATE_ISP); + + /* role is host */ + } else { + if (!(otg_ctrl & OTG_ID)) { + otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS; + omap_writel(otg_ctrl | OTG_A_BUSREQ, OTG_CTRL); + } + + if (isp->otg.host) { + switch (isp->otg.state) { + case OTG_STATE_B_WAIT_ACON: + isp->otg.state = OTG_STATE_B_HOST; + pr_debug(" --> b_host\n"); + kick = 1; + break; + case OTG_STATE_A_WAIT_BCON: + isp->otg.state = OTG_STATE_A_HOST; + pr_debug(" --> a_host\n"); + break; + case OTG_STATE_A_PERIPHERAL: + isp->otg.state = OTG_STATE_A_WAIT_BCON; + pr_debug(" --> a_wait_bcon\n"); + break; + default: + break; + } + isp1301_defer_work(isp, WORK_HOST_RESUME); + } + } + + omap_writew(DRIVER_SWITCH, OTG_IRQ_SRC); + ret = IRQ_HANDLED; + + if (kick) + usb_bus_start_enum(isp->otg.host, + isp->otg.host->otg_port); + } + + check_state(isp, __func__); + return ret; +} + +static struct platform_device *otg_dev; + +static int otg_init(struct isp1301 *isp) +{ + u32 l; + + if (!otg_dev) + return -ENODEV; + + dump_regs(isp, __func__); + /* some of these values are board-specific... */ + l = omap_readl(OTG_SYSCON_2); + l |= OTG_EN + /* for B-device: */ + | SRP_GPDATA /* 9msec Bdev D+ pulse */ + | SRP_GPDVBUS /* discharge after VBUS pulse */ + // | (3 << 24) /* 2msec VBUS pulse */ + /* for A-device: */ + | (0 << 20) /* 200ms nominal A_WAIT_VRISE timer */ + | SRP_DPW /* detect 167+ns SRP pulses */ + | SRP_DATA | SRP_VBUS /* accept both kinds of SRP pulse */ + ; + omap_writel(l, OTG_SYSCON_2); + + update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE)); + update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS)); + + check_state(isp, __func__); + pr_debug("otg: %s, %s %06x\n", + state_name(isp), __func__, omap_readl(OTG_CTRL)); + + omap_writew(DRIVER_SWITCH | OPRT_CHG + | B_SRP_TMROUT | B_HNP_FAIL + | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT, OTG_IRQ_EN); + + l = omap_readl(OTG_SYSCON_2); + l |= OTG_EN; + omap_writel(l, OTG_SYSCON_2); + + return 0; +} + +static int otg_probe(struct platform_device *dev) +{ + // struct omap_usb_config *config = dev->platform_data; + + otg_dev = dev; + return 0; +} + +static int otg_remove(struct platform_device *dev) +{ + otg_dev = NULL; + return 0; +} + +static struct platform_driver omap_otg_driver = { + .probe = otg_probe, + .remove = otg_remove, + .driver = { + .owner = THIS_MODULE, + .name = "omap_otg", + }, +}; + +static int otg_bind(struct isp1301 *isp) +{ + int status; + + if (otg_dev) + return -EBUSY; + + status = platform_driver_register(&omap_otg_driver); + if (status < 0) + return status; + + if (otg_dev) + status = request_irq(otg_dev->resource[1].start, omap_otg_irq, + IRQF_DISABLED, DRIVER_NAME, isp); + else + status = -ENODEV; + + if (status < 0) + platform_driver_unregister(&omap_otg_driver); + return status; +} + +static void otg_unbind(struct isp1301 *isp) +{ + if (!otg_dev) + return; + free_irq(otg_dev->resource[1].start, isp); +} + +#else + +/* OTG controller isn't clocked */ + +#endif /* CONFIG_USB_OTG */ + +/*-------------------------------------------------------------------------*/ + +static void b_peripheral(struct isp1301 *isp) +{ + u32 l; + + l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS; + omap_writel(l, OTG_CTRL); + + usb_gadget_vbus_connect(isp->otg.gadget); + +#ifdef CONFIG_USB_OTG + enable_vbus_draw(isp, 8); + otg_update_isp(isp); +#else + enable_vbus_draw(isp, 100); + /* UDC driver just set OTG_BSESSVLD */ + isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLUP); + isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_DP_PULLDOWN); + isp->otg.state = OTG_STATE_B_PERIPHERAL; + pr_debug(" --> b_peripheral\n"); + dump_regs(isp, "2periph"); +#endif +} + +static void isp_update_otg(struct isp1301 *isp, u8 stat) +{ + u8 isp_stat, isp_bstat; + enum usb_otg_state state = isp->otg.state; + + if (stat & INTR_BDIS_ACON) + pr_debug("OTG: BDIS_ACON, %s\n", state_name(isp)); + + /* start certain state transitions right away */ + isp_stat = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE); + if (isp_stat & INTR_ID_GND) { + if (isp->otg.default_a) { + switch (state) { + case OTG_STATE_B_IDLE: + a_idle(isp, "idle"); + /* FALLTHROUGH */ + case OTG_STATE_A_IDLE: + enable_vbus_source(isp); + /* FALLTHROUGH */ + case OTG_STATE_A_WAIT_VRISE: + /* we skip over OTG_STATE_A_WAIT_BCON, since + * the HC will transition to A_HOST (or + * A_SUSPEND!) without our noticing except + * when HNP is used. + */ + if (isp_stat & INTR_VBUS_VLD) + isp->otg.state = OTG_STATE_A_HOST; + break; + case OTG_STATE_A_WAIT_VFALL: + if (!(isp_stat & INTR_SESS_VLD)) + a_idle(isp, "vfell"); + break; + default: + if (!(isp_stat & INTR_VBUS_VLD)) + isp->otg.state = OTG_STATE_A_VBUS_ERR; + break; + } + isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS); + } else { + switch (state) { + case OTG_STATE_B_PERIPHERAL: + case OTG_STATE_B_HOST: + case OTG_STATE_B_WAIT_ACON: + usb_gadget_vbus_disconnect(isp->otg.gadget); + break; + default: + break; + } + if (state != OTG_STATE_A_IDLE) + a_idle(isp, "id"); + if (isp->otg.host && state == OTG_STATE_A_IDLE) + isp1301_defer_work(isp, WORK_HOST_RESUME); + isp_bstat = 0; + } + } else { + u32 l; + + /* if user unplugged mini-A end of cable, + * don't bypass A_WAIT_VFALL. + */ + if (isp->otg.default_a) { + switch (state) { + default: + isp->otg.state = OTG_STATE_A_WAIT_VFALL; + break; + case OTG_STATE_A_WAIT_VFALL: + state = OTG_STATE_A_IDLE; + /* khubd may take a while to notice and + * handle this disconnect, so don't go + * to B_IDLE quite yet. + */ + break; + case OTG_STATE_A_IDLE: + host_suspend(isp); + isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, + MC1_BDIS_ACON_EN); + isp->otg.state = OTG_STATE_B_IDLE; + l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK; + l &= ~OTG_CTRL_BITS; + omap_writel(l, OTG_CTRL); + break; + case OTG_STATE_B_IDLE: + break; + } + } + isp_bstat = isp1301_get_u8(isp, ISP1301_OTG_STATUS); + + switch (isp->otg.state) { + case OTG_STATE_B_PERIPHERAL: + case OTG_STATE_B_WAIT_ACON: + case OTG_STATE_B_HOST: + if (likely(isp_bstat & OTG_B_SESS_VLD)) + break; + enable_vbus_draw(isp, 0); +#ifndef CONFIG_USB_OTG + /* UDC driver will clear OTG_BSESSVLD */ + isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, + OTG1_DP_PULLDOWN); + isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, + OTG1_DP_PULLUP); + dump_regs(isp, __func__); +#endif + /* FALLTHROUGH */ + case OTG_STATE_B_SRP_INIT: + b_idle(isp, __func__); + l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS; + omap_writel(l, OTG_CTRL); + /* FALLTHROUGH */ + case OTG_STATE_B_IDLE: + if (isp->otg.gadget && (isp_bstat & OTG_B_SESS_VLD)) { +#ifdef CONFIG_USB_OTG + update_otg1(isp, isp_stat); + update_otg2(isp, isp_bstat); +#endif + b_peripheral(isp); + } else if (!(isp_stat & (INTR_VBUS_VLD|INTR_SESS_VLD))) + isp_bstat |= OTG_B_SESS_END; + break; + case OTG_STATE_A_WAIT_VFALL: + break; + default: + pr_debug("otg: unsupported b-device %s\n", + state_name(isp)); + break; + } + } + + if (state != isp->otg.state) + pr_debug(" isp, %s -> %s\n", + state_string(state), state_name(isp)); + +#ifdef CONFIG_USB_OTG + /* update the OTG controller state to match the isp1301; may + * trigger OPRT_CHG irqs for changes going to the isp1301. + */ + update_otg1(isp, isp_stat); + update_otg2(isp, isp_bstat); + check_state(isp, __func__); +#endif + + dump_regs(isp, "isp1301->otg"); +} + +/*-------------------------------------------------------------------------*/ + +static u8 isp1301_clear_latch(struct isp1301 *isp) +{ + u8 latch = isp1301_get_u8(isp, ISP1301_INTERRUPT_LATCH); + isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, latch); + return latch; +} + +static void +isp1301_work(struct work_struct *work) +{ + struct isp1301 *isp = container_of(work, struct isp1301, work); + int stop; + + /* implicit lock: we're the only task using this device */ + isp->working = 1; + do { + stop = test_bit(WORK_STOP, &isp->todo); + +#ifdef CONFIG_USB_OTG + /* transfer state from otg engine to isp1301 */ + if (test_and_clear_bit(WORK_UPDATE_ISP, &isp->todo)) { + otg_update_isp(isp); + put_device(&isp->client->dev); + } +#endif + /* transfer state from isp1301 to otg engine */ + if (test_and_clear_bit(WORK_UPDATE_OTG, &isp->todo)) { + u8 stat = isp1301_clear_latch(isp); + + isp_update_otg(isp, stat); + put_device(&isp->client->dev); + } + + if (test_and_clear_bit(WORK_HOST_RESUME, &isp->todo)) { + u32 otg_ctrl; + + /* + * skip A_WAIT_VRISE; hc transitions invisibly + * skip A_WAIT_BCON; same. + */ + switch (isp->otg.state) { + case OTG_STATE_A_WAIT_BCON: + case OTG_STATE_A_WAIT_VRISE: + isp->otg.state = OTG_STATE_A_HOST; + pr_debug(" --> a_host\n"); + otg_ctrl = omap_readl(OTG_CTRL); + otg_ctrl |= OTG_A_BUSREQ; + otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ) + & OTG_CTRL_MASK; + omap_writel(otg_ctrl, OTG_CTRL); + break; + case OTG_STATE_B_WAIT_ACON: + isp->otg.state = OTG_STATE_B_HOST; + pr_debug(" --> b_host (acon)\n"); + break; + case OTG_STATE_B_HOST: + case OTG_STATE_B_IDLE: + case OTG_STATE_A_IDLE: + break; + default: + pr_debug(" host resume in %s\n", + state_name(isp)); + } + host_resume(isp); + // mdelay(10); + put_device(&isp->client->dev); + } + + if (test_and_clear_bit(WORK_TIMER, &isp->todo)) { +#ifdef VERBOSE + dump_regs(isp, "timer"); + if (!stop) + mod_timer(&isp->timer, jiffies + TIMER_JIFFIES); +#endif + put_device(&isp->client->dev); + } + + if (isp->todo) + dev_vdbg(&isp->client->dev, + "work done, todo = 0x%lx\n", + isp->todo); + if (stop) { + dev_dbg(&isp->client->dev, "stop\n"); + break; + } + } while (isp->todo); + isp->working = 0; +} + +static irqreturn_t isp1301_irq(int irq, void *isp) +{ + isp1301_defer_work(isp, WORK_UPDATE_OTG); + return IRQ_HANDLED; +} + +static void isp1301_timer(unsigned long _isp) +{ + isp1301_defer_work((void *)_isp, WORK_TIMER); +} + +/*-------------------------------------------------------------------------*/ + +static void isp1301_release(struct device *dev) +{ + struct isp1301 *isp; + + isp = dev_get_drvdata(dev); + + /* FIXME -- not with a "new style" driver, it doesn't!! */ + + /* ugly -- i2c hijacks our memory hook to wait_for_completion() */ + if (isp->i2c_release) + isp->i2c_release(dev); + kfree (isp); +} + +static struct isp1301 *the_transceiver; + +static int __exit isp1301_remove(struct i2c_client *i2c) +{ + struct isp1301 *isp; + + isp = i2c_get_clientdata(i2c); + + isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0); + isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0); + free_irq(i2c->irq, isp); +#ifdef CONFIG_USB_OTG + otg_unbind(isp); +#endif + if (machine_is_omap_h2()) + gpio_free(2); + + isp->timer.data = 0; + set_bit(WORK_STOP, &isp->todo); + del_timer_sync(&isp->timer); + flush_scheduled_work(); + + put_device(&i2c->dev); + the_transceiver = NULL; + + return 0; +} + +/*-------------------------------------------------------------------------*/ + +/* NOTE: three modes are possible here, only one of which + * will be standards-conformant on any given system: + * + * - OTG mode (dual-role), required if there's a Mini-AB connector + * - HOST mode, for when there's one or more A (host) connectors + * - DEVICE mode, for when there's a B/Mini-B (device) connector + * + * As a rule, you won't have an isp1301 chip unless it's there to + * support the OTG mode. Other modes help testing USB controllers + * in isolation from (full) OTG support, or maybe so later board + * revisions can help to support those feature. + */ + +#ifdef CONFIG_USB_OTG + +static int isp1301_otg_enable(struct isp1301 *isp) +{ + power_up(isp); + otg_init(isp); + + /* NOTE: since we don't change this, this provides + * a few more interrupts than are strictly needed. + */ + isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING, + INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND); + isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING, + INTR_VBUS_VLD | INTR_SESS_VLD | INTR_ID_GND); + + dev_info(&isp->client->dev, "ready for dual-role USB ...\n"); + + return 0; +} + +#endif + +/* add or disable the host device+driver */ +static int +isp1301_set_host(struct otg_transceiver *otg, struct usb_bus *host) +{ + struct isp1301 *isp = container_of(otg, struct isp1301, otg); + + if (!otg || isp != the_transceiver) + return -ENODEV; + + if (!host) { + omap_writew(0, OTG_IRQ_EN); + power_down(isp); + isp->otg.host = NULL; + return 0; + } + +#ifdef CONFIG_USB_OTG + isp->otg.host = host; + dev_dbg(&isp->client->dev, "registered host\n"); + host_suspend(isp); + if (isp->otg.gadget) + return isp1301_otg_enable(isp); + return 0; + +#elif !defined(CONFIG_USB_GADGET_OMAP) + // FIXME update its refcount + isp->otg.host = host; + + power_up(isp); + + if (machine_is_omap_h2()) + isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0); + + dev_info(&isp->client->dev, "A-Host sessions ok\n"); + isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING, + INTR_ID_GND); + isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING, + INTR_ID_GND); + + /* If this has a Mini-AB connector, this mode is highly + * nonstandard ... but can be handy for testing, especially with + * the Mini-A end of an OTG cable. (Or something nonstandard + * like MiniB-to-StandardB, maybe built with a gender mender.) + */ + isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_VBUS_DRV); + + dump_regs(isp, __func__); + + return 0; + +#else + dev_dbg(&isp->client->dev, "host sessions not allowed\n"); + return -EINVAL; +#endif + +} + +static int +isp1301_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *gadget) +{ + struct isp1301 *isp = container_of(otg, struct isp1301, otg); +#ifndef CONFIG_USB_OTG + u32 l; +#endif + + if (!otg || isp != the_transceiver) + return -ENODEV; + + if (!gadget) { + omap_writew(0, OTG_IRQ_EN); + if (!isp->otg.default_a) + enable_vbus_draw(isp, 0); + usb_gadget_vbus_disconnect(isp->otg.gadget); + isp->otg.gadget = NULL; + power_down(isp); + return 0; + } + +#ifdef CONFIG_USB_OTG + isp->otg.gadget = gadget; + dev_dbg(&isp->client->dev, "registered gadget\n"); + /* gadget driver may be suspended until vbus_connect () */ + if (isp->otg.host) + return isp1301_otg_enable(isp); + return 0; + +#elif !defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE) + isp->otg.gadget = gadget; + // FIXME update its refcount + + l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK; + l &= ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS); + l |= OTG_ID; + omap_writel(l, OTG_CTRL); + + power_up(isp); + isp->otg.state = OTG_STATE_B_IDLE; + + if (machine_is_omap_h2() || machine_is_omap_h3()) + isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0); + + isp1301_set_bits(isp, ISP1301_INTERRUPT_RISING, + INTR_SESS_VLD); + isp1301_set_bits(isp, ISP1301_INTERRUPT_FALLING, + INTR_VBUS_VLD); + dev_info(&isp->client->dev, "B-Peripheral sessions ok\n"); + dump_regs(isp, __func__); + + /* If this has a Mini-AB connector, this mode is highly + * nonstandard ... but can be handy for testing, so long + * as you don't plug a Mini-A cable into the jack. + */ + if (isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE) & INTR_VBUS_VLD) + b_peripheral(isp); + + return 0; + +#else + dev_dbg(&isp->client->dev, "peripheral sessions not allowed\n"); + return -EINVAL; +#endif +} + + +/*-------------------------------------------------------------------------*/ + +static int +isp1301_set_power(struct otg_transceiver *dev, unsigned mA) +{ + if (!the_transceiver) + return -ENODEV; + if (dev->state == OTG_STATE_B_PERIPHERAL) + enable_vbus_draw(the_transceiver, mA); + return 0; +} + +static int +isp1301_start_srp(struct otg_transceiver *dev) +{ + struct isp1301 *isp = container_of(dev, struct isp1301, otg); + u32 otg_ctrl; + + if (!dev || isp != the_transceiver + || isp->otg.state != OTG_STATE_B_IDLE) + return -ENODEV; + + otg_ctrl = omap_readl(OTG_CTRL); + if (!(otg_ctrl & OTG_BSESSEND)) + return -EINVAL; + + otg_ctrl |= OTG_B_BUSREQ; + otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK; + omap_writel(otg_ctrl, OTG_CTRL); + isp->otg.state = OTG_STATE_B_SRP_INIT; + + pr_debug("otg: SRP, %s ... %06x\n", state_name(isp), + omap_readl(OTG_CTRL)); +#ifdef CONFIG_USB_OTG + check_state(isp, __func__); +#endif + return 0; +} + +static int +isp1301_start_hnp(struct otg_transceiver *dev) +{ +#ifdef CONFIG_USB_OTG + struct isp1301 *isp = container_of(dev, struct isp1301, otg); + u32 l; + + if (!dev || isp != the_transceiver) + return -ENODEV; + if (isp->otg.default_a && (isp->otg.host == NULL + || !isp->otg.host->b_hnp_enable)) + return -ENOTCONN; + if (!isp->otg.default_a && (isp->otg.gadget == NULL + || !isp->otg.gadget->b_hnp_enable)) + return -ENOTCONN; + + /* We want hardware to manage most HNP protocol timings. + * So do this part as early as possible... + */ + switch (isp->otg.state) { + case OTG_STATE_B_HOST: + isp->otg.state = OTG_STATE_B_PERIPHERAL; + /* caller will suspend next */ + break; + case OTG_STATE_A_HOST: +#if 0 + /* autoconnect mode avoids irq latency bugs */ + isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, + MC1_BDIS_ACON_EN); +#endif + /* caller must suspend then clear A_BUSREQ */ + usb_gadget_vbus_connect(isp->otg.gadget); + l = omap_readl(OTG_CTRL); + l |= OTG_A_SETB_HNPEN; + omap_writel(l, OTG_CTRL); + + break; + case OTG_STATE_A_PERIPHERAL: + /* initiated by B-Host suspend */ + break; + default: + return -EILSEQ; + } + pr_debug("otg: HNP %s, %06x ...\n", + state_name(isp), omap_readl(OTG_CTRL)); + check_state(isp, __func__); + return 0; +#else + /* srp-only */ + return -EINVAL; +#endif +} + +/*-------------------------------------------------------------------------*/ + +static int __init +isp1301_probe(struct i2c_client *i2c, const struct i2c_device_id *id) +{ + int status; + struct isp1301 *isp; + + if (the_transceiver) + return 0; + + isp = kzalloc(sizeof *isp, GFP_KERNEL); + if (!isp) + return 0; + + INIT_WORK(&isp->work, isp1301_work); + init_timer(&isp->timer); + isp->timer.function = isp1301_timer; + isp->timer.data = (unsigned long) isp; + + i2c_set_clientdata(i2c, isp); + isp->client = i2c; + + /* verify the chip (shouldn't be necesary) */ + status = isp1301_get_u16(isp, ISP1301_VENDOR_ID); + if (status != I2C_VENDOR_ID_PHILIPS) { + dev_dbg(&i2c->dev, "not philips id: %d\n", status); + goto fail; + } + status = isp1301_get_u16(isp, ISP1301_PRODUCT_ID); + if (status != I2C_PRODUCT_ID_PHILIPS_1301) { + dev_dbg(&i2c->dev, "not isp1301, %d\n", status); + goto fail; + } + isp->i2c_release = i2c->dev.release; + i2c->dev.release = isp1301_release; + + /* initial development used chiprev 2.00 */ + status = i2c_smbus_read_word_data(i2c, ISP1301_BCD_DEVICE); + dev_info(&i2c->dev, "chiprev %x.%02x, driver " DRIVER_VERSION "\n", + status >> 8, status & 0xff); + + /* make like power-on reset */ + isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_MASK); + + isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_BI_DI); + isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, ~MC2_BI_DI); + + isp1301_set_bits(isp, ISP1301_OTG_CONTROL_1, + OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN); + isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, + ~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN)); + + isp1301_clear_bits(isp, ISP1301_INTERRUPT_LATCH, ~0); + isp1301_clear_bits(isp, ISP1301_INTERRUPT_FALLING, ~0); + isp1301_clear_bits(isp, ISP1301_INTERRUPT_RISING, ~0); + +#ifdef CONFIG_USB_OTG + status = otg_bind(isp); + if (status < 0) { + dev_dbg(&i2c->dev, "can't bind OTG\n"); + goto fail; + } +#endif + + if (machine_is_omap_h2()) { + /* full speed signaling by default */ + isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, + MC1_SPEED); + isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, + MC2_SPD_SUSP_CTRL); + + /* IRQ wired at M14 */ + omap_cfg_reg(M14_1510_GPIO2); + if (gpio_request(2, "isp1301") == 0) + gpio_direction_input(2); + isp->irq_type = IRQF_TRIGGER_FALLING; + } + + isp->irq_type |= IRQF_SAMPLE_RANDOM; + status = request_irq(i2c->irq, isp1301_irq, + isp->irq_type, DRIVER_NAME, isp); + if (status < 0) { + dev_dbg(&i2c->dev, "can't get IRQ %d, err %d\n", + i2c->irq, status); + goto fail; + } + + isp->otg.dev = &i2c->dev; + isp->otg.label = DRIVER_NAME; + + isp->otg.set_host = isp1301_set_host, + isp->otg.set_peripheral = isp1301_set_peripheral, + isp->otg.set_power = isp1301_set_power, + isp->otg.start_srp = isp1301_start_srp, + isp->otg.start_hnp = isp1301_start_hnp, + + enable_vbus_draw(isp, 0); + power_down(isp); + the_transceiver = isp; + +#ifdef CONFIG_USB_OTG + update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE)); + update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS)); +#endif + + dump_regs(isp, __func__); + +#ifdef VERBOSE + mod_timer(&isp->timer, jiffies + TIMER_JIFFIES); + dev_dbg(&i2c->dev, "scheduled timer, %d min\n", TIMER_MINUTES); +#endif + + status = otg_set_transceiver(&isp->otg); + if (status < 0) + dev_err(&i2c->dev, "can't register transceiver, %d\n", + status); + + return 0; + +fail: + kfree(isp); + return -ENODEV; +} + +static const struct i2c_device_id isp1301_id[] = { + { "isp1301_omap", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, isp1301_id); + +static struct i2c_driver isp1301_driver = { + .driver = { + .name = "isp1301_omap", + }, + .probe = isp1301_probe, + .remove = __exit_p(isp1301_remove), + .id_table = isp1301_id, +}; + +/*-------------------------------------------------------------------------*/ + +static int __init isp_init(void) +{ + return i2c_add_driver(&isp1301_driver); +} +module_init(isp_init); + +static void __exit isp_exit(void) +{ + if (the_transceiver) + otg_set_transceiver(NULL); + i2c_del_driver(&isp1301_driver); +} +module_exit(isp_exit); + |