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1641 lines
40 KiB
1641 lines
40 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* isp1301_omap - ISP 1301 USB transceiver, talking to OMAP OTG controller |
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* |
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* Copyright (C) 2004 Texas Instruments |
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* Copyright (C) 2004 David Brownell |
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*/ |
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|
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/slab.h> |
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#include <linux/interrupt.h> |
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#include <linux/platform_device.h> |
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#include <linux/gpio.h> |
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#include <linux/usb/ch9.h> |
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#include <linux/usb/gadget.h> |
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#include <linux/usb.h> |
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#include <linux/usb/otg.h> |
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#include <linux/i2c.h> |
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#include <linux/workqueue.h> |
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#include <asm/irq.h> |
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#include <asm/mach-types.h> |
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#include <mach/mux.h> |
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#include <mach/usb.h> |
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#undef VERBOSE |
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#define DRIVER_VERSION "24 August 2004" |
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#define DRIVER_NAME (isp1301_driver.driver.name) |
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MODULE_DESCRIPTION("ISP1301 USB OTG Transceiver Driver"); |
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MODULE_LICENSE("GPL"); |
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struct isp1301 { |
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struct usb_phy phy; |
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struct i2c_client *client; |
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void (*i2c_release)(struct device *dev); |
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int irq_type; |
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u32 last_otg_ctrl; |
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unsigned working:1; |
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struct timer_list timer; |
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/* use keventd context to change the state for us */ |
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struct work_struct work; |
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unsigned long todo; |
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# define WORK_UPDATE_ISP 0 /* update ISP from OTG */ |
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# define WORK_UPDATE_OTG 1 /* update OTG from ISP */ |
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# define WORK_HOST_RESUME 4 /* resume host */ |
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# define WORK_TIMER 6 /* timer fired */ |
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# define WORK_STOP 7 /* don't resubmit */ |
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}; |
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/* bits in OTG_CTRL */ |
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#define OTG_XCEIV_OUTPUTS \ |
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(OTG_ASESSVLD|OTG_BSESSEND|OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID) |
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#define OTG_XCEIV_INPUTS \ |
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(OTG_PULLDOWN|OTG_PULLUP|OTG_DRV_VBUS|OTG_PD_VBUS|OTG_PU_VBUS|OTG_PU_ID) |
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#define OTG_CTRL_BITS \ |
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(OTG_A_BUSREQ|OTG_A_SETB_HNPEN|OTG_B_BUSREQ|OTG_B_HNPEN|OTG_BUSDROP) |
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/* and OTG_PULLUP is sometimes written */ |
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#define OTG_CTRL_MASK (OTG_DRIVER_SEL| \ |
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OTG_XCEIV_OUTPUTS|OTG_XCEIV_INPUTS| \ |
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OTG_CTRL_BITS) |
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/*-------------------------------------------------------------------------*/ |
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|
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/* board-specific PM hooks */ |
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#if defined(CONFIG_MACH_OMAP_H2) || defined(CONFIG_MACH_OMAP_H3) |
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#if IS_REACHABLE(CONFIG_TPS65010) |
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#include <linux/mfd/tps65010.h> |
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#else |
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static inline int tps65010_set_vbus_draw(unsigned mA) |
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{ |
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pr_debug("tps65010: draw %d mA (STUB)\n", mA); |
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return 0; |
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} |
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#endif |
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static void enable_vbus_draw(struct isp1301 *isp, unsigned mA) |
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{ |
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int status = tps65010_set_vbus_draw(mA); |
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if (status < 0) |
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pr_debug(" VBUS %d mA error %d\n", mA, status); |
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} |
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#else |
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static void enable_vbus_draw(struct isp1301 *isp, unsigned mA) |
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{ |
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/* H4 controls this by DIP switch S2.4; no soft control. |
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* ON means the charger is always enabled. Leave it OFF |
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* unless the OTG port is used only in B-peripheral mode. |
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*/ |
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} |
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#endif |
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static void enable_vbus_source(struct isp1301 *isp) |
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{ |
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/* this board won't supply more than 8mA vbus power. |
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* some boards can switch a 100ma "unit load" (or more). |
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*/ |
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} |
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/* products will deliver OTG messages with LEDs, GUI, etc */ |
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static inline void notresponding(struct isp1301 *isp) |
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{ |
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printk(KERN_NOTICE "OTG device not responding.\n"); |
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} |
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/*-------------------------------------------------------------------------*/ |
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static struct i2c_driver isp1301_driver; |
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|
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/* smbus apis are used for portability */ |
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static inline u8 |
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isp1301_get_u8(struct isp1301 *isp, u8 reg) |
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{ |
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return i2c_smbus_read_byte_data(isp->client, reg + 0); |
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} |
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static inline int |
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isp1301_get_u16(struct isp1301 *isp, u8 reg) |
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{ |
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return i2c_smbus_read_word_data(isp->client, reg); |
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} |
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static inline int |
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isp1301_set_bits(struct isp1301 *isp, u8 reg, u8 bits) |
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{ |
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return i2c_smbus_write_byte_data(isp->client, reg + 0, bits); |
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} |
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static inline int |
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isp1301_clear_bits(struct isp1301 *isp, u8 reg, u8 bits) |
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{ |
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return i2c_smbus_write_byte_data(isp->client, reg + 1, bits); |
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} |
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/*-------------------------------------------------------------------------*/ |
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/* identification */ |
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#define ISP1301_VENDOR_ID 0x00 /* u16 read */ |
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#define ISP1301_PRODUCT_ID 0x02 /* u16 read */ |
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#define ISP1301_BCD_DEVICE 0x14 /* u16 read */ |
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#define I2C_VENDOR_ID_PHILIPS 0x04cc |
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#define I2C_PRODUCT_ID_PHILIPS_1301 0x1301 |
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|
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/* operational registers */ |
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#define ISP1301_MODE_CONTROL_1 0x04 /* u8 read, set, +1 clear */ |
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# define MC1_SPEED (1 << 0) |
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# define MC1_SUSPEND (1 << 1) |
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# define MC1_DAT_SE0 (1 << 2) |
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# define MC1_TRANSPARENT (1 << 3) |
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# define MC1_BDIS_ACON_EN (1 << 4) |
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# define MC1_OE_INT_EN (1 << 5) |
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# define MC1_UART_EN (1 << 6) |
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# define MC1_MASK 0x7f |
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#define ISP1301_MODE_CONTROL_2 0x12 /* u8 read, set, +1 clear */ |
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# define MC2_GLOBAL_PWR_DN (1 << 0) |
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# define MC2_SPD_SUSP_CTRL (1 << 1) |
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# define MC2_BI_DI (1 << 2) |
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# define MC2_TRANSP_BDIR0 (1 << 3) |
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# define MC2_TRANSP_BDIR1 (1 << 4) |
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# define MC2_AUDIO_EN (1 << 5) |
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# define MC2_PSW_EN (1 << 6) |
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# define MC2_EN2V7 (1 << 7) |
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#define ISP1301_OTG_CONTROL_1 0x06 /* u8 read, set, +1 clear */ |
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# define OTG1_DP_PULLUP (1 << 0) |
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# define OTG1_DM_PULLUP (1 << 1) |
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# define OTG1_DP_PULLDOWN (1 << 2) |
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# define OTG1_DM_PULLDOWN (1 << 3) |
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# define OTG1_ID_PULLDOWN (1 << 4) |
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# define OTG1_VBUS_DRV (1 << 5) |
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# define OTG1_VBUS_DISCHRG (1 << 6) |
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# define OTG1_VBUS_CHRG (1 << 7) |
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#define ISP1301_OTG_STATUS 0x10 /* u8 readonly */ |
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# define OTG_B_SESS_END (1 << 6) |
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# define OTG_B_SESS_VLD (1 << 7) |
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|
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#define ISP1301_INTERRUPT_SOURCE 0x08 /* u8 read */ |
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#define ISP1301_INTERRUPT_LATCH 0x0A /* u8 read, set, +1 clear */ |
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#define ISP1301_INTERRUPT_FALLING 0x0C /* u8 read, set, +1 clear */ |
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#define ISP1301_INTERRUPT_RISING 0x0E /* u8 read, set, +1 clear */ |
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/* same bitfields in all interrupt registers */ |
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# define INTR_VBUS_VLD (1 << 0) |
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# define INTR_SESS_VLD (1 << 1) |
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# define INTR_DP_HI (1 << 2) |
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# define INTR_ID_GND (1 << 3) |
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# define INTR_DM_HI (1 << 4) |
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# define INTR_ID_FLOAT (1 << 5) |
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# define INTR_BDIS_ACON (1 << 6) |
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# define INTR_CR_INT (1 << 7) |
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/*-------------------------------------------------------------------------*/ |
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static inline const char *state_name(struct isp1301 *isp) |
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{ |
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return usb_otg_state_string(isp->phy.otg->state); |
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} |
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/*-------------------------------------------------------------------------*/ |
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|
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/* NOTE: some of this ISP1301 setup is specific to H2 boards; |
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* not everything is guarded by board-specific checks, or even using |
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* omap_usb_config data to deduce MC1_DAT_SE0 and MC2_BI_DI. |
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* |
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* ALSO: this currently doesn't use ISP1301 low-power modes |
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* while OTG is running. |
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*/ |
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static void power_down(struct isp1301 *isp) |
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{ |
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isp->phy.otg->state = OTG_STATE_UNDEFINED; |
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// isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN); |
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isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND); |
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isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_ID_PULLDOWN); |
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isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0); |
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} |
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static void __maybe_unused power_up(struct isp1301 *isp) |
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{ |
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// isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN); |
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isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND); |
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/* do this only when cpu is driving transceiver, |
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* so host won't see a low speed device... |
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*/ |
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isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0); |
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} |
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#define NO_HOST_SUSPEND |
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static int host_suspend(struct isp1301 *isp) |
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{ |
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#ifdef NO_HOST_SUSPEND |
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return 0; |
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#else |
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struct device *dev; |
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if (!isp->phy.otg->host) |
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return -ENODEV; |
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/* Currently ASSUMES only the OTG port matters; |
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* other ports could be active... |
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*/ |
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dev = isp->phy.otg->host->controller; |
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return dev->driver->suspend(dev, 3, 0); |
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#endif |
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} |
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static int host_resume(struct isp1301 *isp) |
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{ |
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#ifdef NO_HOST_SUSPEND |
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return 0; |
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#else |
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struct device *dev; |
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if (!isp->phy.otg->host) |
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return -ENODEV; |
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dev = isp->phy.otg->host->controller; |
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return dev->driver->resume(dev, 0); |
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#endif |
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} |
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static int gadget_suspend(struct isp1301 *isp) |
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{ |
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isp->phy.otg->gadget->b_hnp_enable = 0; |
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isp->phy.otg->gadget->a_hnp_support = 0; |
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isp->phy.otg->gadget->a_alt_hnp_support = 0; |
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return usb_gadget_vbus_disconnect(isp->phy.otg->gadget); |
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} |
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/*-------------------------------------------------------------------------*/ |
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#define TIMER_MINUTES 10 |
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#define TIMER_JIFFIES (TIMER_MINUTES * 60 * HZ) |
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/* Almost all our I2C messaging comes from a work queue's task context. |
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* NOTE: guaranteeing certain response times might mean we shouldn't |
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* share keventd's work queue; a realtime task might be safest. |
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*/ |
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static void isp1301_defer_work(struct isp1301 *isp, int work) |
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{ |
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int status; |
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if (isp && !test_and_set_bit(work, &isp->todo)) { |
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(void) get_device(&isp->client->dev); |
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status = schedule_work(&isp->work); |
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if (!status && !isp->working) |
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dev_vdbg(&isp->client->dev, |
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"work item %d may be lost\n", work); |
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} |
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} |
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/* called from irq handlers */ |
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static void a_idle(struct isp1301 *isp, const char *tag) |
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{ |
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u32 l; |
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if (isp->phy.otg->state == OTG_STATE_A_IDLE) |
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return; |
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isp->phy.otg->default_a = 1; |
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if (isp->phy.otg->host) { |
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isp->phy.otg->host->is_b_host = 0; |
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host_suspend(isp); |
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} |
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if (isp->phy.otg->gadget) { |
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isp->phy.otg->gadget->is_a_peripheral = 1; |
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gadget_suspend(isp); |
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} |
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isp->phy.otg->state = OTG_STATE_A_IDLE; |
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l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS; |
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omap_writel(l, OTG_CTRL); |
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isp->last_otg_ctrl = l; |
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pr_debug(" --> %s/%s\n", state_name(isp), tag); |
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} |
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/* called from irq handlers */ |
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static void b_idle(struct isp1301 *isp, const char *tag) |
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{ |
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u32 l; |
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if (isp->phy.otg->state == OTG_STATE_B_IDLE) |
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return; |
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isp->phy.otg->default_a = 0; |
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if (isp->phy.otg->host) { |
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isp->phy.otg->host->is_b_host = 1; |
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host_suspend(isp); |
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} |
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if (isp->phy.otg->gadget) { |
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isp->phy.otg->gadget->is_a_peripheral = 0; |
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gadget_suspend(isp); |
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} |
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isp->phy.otg->state = OTG_STATE_B_IDLE; |
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l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS; |
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omap_writel(l, OTG_CTRL); |
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isp->last_otg_ctrl = l; |
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pr_debug(" --> %s/%s\n", state_name(isp), tag); |
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} |
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static void |
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dump_regs(struct isp1301 *isp, const char *label) |
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{ |
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u8 ctrl = isp1301_get_u8(isp, ISP1301_OTG_CONTROL_1); |
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u8 status = isp1301_get_u8(isp, ISP1301_OTG_STATUS); |
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u8 src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE); |
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pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n", |
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omap_readl(OTG_CTRL), label, state_name(isp), |
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ctrl, status, src); |
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/* mode control and irq enables don't change much */ |
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} |
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/*-------------------------------------------------------------------------*/ |
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#ifdef CONFIG_USB_OTG |
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/* |
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* The OMAP OTG controller handles most of the OTG state transitions. |
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* |
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* We translate isp1301 outputs (mostly voltage comparator status) into |
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* OTG inputs; OTG outputs (mostly pullup/pulldown controls) and HNP state |
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* flags into isp1301 inputs ... and infer state transitions. |
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*/ |
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#ifdef VERBOSE |
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static void check_state(struct isp1301 *isp, const char *tag) |
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{ |
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enum usb_otg_state state = OTG_STATE_UNDEFINED; |
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u8 fsm = omap_readw(OTG_TEST) & 0x0ff; |
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unsigned extra = 0; |
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|
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switch (fsm) { |
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|
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/* default-b */ |
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case 0x0: |
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state = OTG_STATE_B_IDLE; |
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break; |
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case 0x3: |
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case 0x7: |
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extra = 1; |
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case 0x1: |
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state = OTG_STATE_B_PERIPHERAL; |
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break; |
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case 0x11: |
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state = OTG_STATE_B_SRP_INIT; |
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break; |
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|
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/* extra dual-role default-b states */ |
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case 0x12: |
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case 0x13: |
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case 0x16: |
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extra = 1; |
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case 0x17: |
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state = OTG_STATE_B_WAIT_ACON; |
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break; |
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case 0x34: |
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state = OTG_STATE_B_HOST; |
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break; |
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|
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/* default-a */ |
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case 0x36: |
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state = OTG_STATE_A_IDLE; |
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break; |
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case 0x3c: |
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state = OTG_STATE_A_WAIT_VFALL; |
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break; |
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case 0x7d: |
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state = OTG_STATE_A_VBUS_ERR; |
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break; |
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case 0x9e: |
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case 0x9f: |
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extra = 1; |
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case 0x89: |
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state = OTG_STATE_A_PERIPHERAL; |
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break; |
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case 0xb7: |
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state = OTG_STATE_A_WAIT_VRISE; |
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break; |
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case 0xb8: |
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state = OTG_STATE_A_WAIT_BCON; |
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break; |
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case 0xb9: |
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state = OTG_STATE_A_HOST; |
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break; |
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case 0xba: |
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state = OTG_STATE_A_SUSPEND; |
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break; |
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default: |
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break; |
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} |
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if (isp->phy.otg->state == state && !extra) |
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return; |
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pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag, |
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usb_otg_state_string(state), fsm, state_name(isp), |
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omap_readl(OTG_CTRL)); |
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} |
|
|
|
#else |
|
|
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static inline void check_state(struct isp1301 *isp, const char *tag) { } |
|
|
|
#endif |
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|
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/* outputs from ISP1301_INTERRUPT_SOURCE */ |
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static void update_otg1(struct isp1301 *isp, u8 int_src) |
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{ |
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u32 otg_ctrl; |
|
|
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otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK; |
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otg_ctrl &= ~OTG_XCEIV_INPUTS; |
|
otg_ctrl &= ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD); |
|
|
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if (int_src & INTR_SESS_VLD) |
|
otg_ctrl |= OTG_ASESSVLD; |
|
else if (isp->phy.otg->state == OTG_STATE_A_WAIT_VFALL) { |
|
a_idle(isp, "vfall"); |
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otg_ctrl &= ~OTG_CTRL_BITS; |
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} |
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if (int_src & INTR_VBUS_VLD) |
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otg_ctrl |= OTG_VBUSVLD; |
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if (int_src & INTR_ID_GND) { /* default-A */ |
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if (isp->phy.otg->state == OTG_STATE_B_IDLE |
|
|| isp->phy.otg->state |
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== OTG_STATE_UNDEFINED) { |
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a_idle(isp, "init"); |
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return; |
|
} |
|
} else { /* default-B */ |
|
otg_ctrl |= OTG_ID; |
|
if (isp->phy.otg->state == OTG_STATE_A_IDLE |
|
|| isp->phy.otg->state == OTG_STATE_UNDEFINED) { |
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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; |
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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->phy.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->phy.otg->gadget->b_hnp_enable) { |
|
isp->phy.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->phy.otg->host)) |
|
otg_ctrl &= ~OTG_DRV_VBUS; |
|
|
|
switch (isp->phy.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->phy.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->phy.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->phy.otg->state) { |
|
case OTG_STATE_B_IDLE: |
|
if (clr & OTG1_DP_PULLUP) |
|
break; |
|
isp->phy.otg->state = OTG_STATE_B_PERIPHERAL; |
|
pr_debug(" --> b_peripheral\n"); |
|
break; |
|
case OTG_STATE_A_SUSPEND: |
|
if (clr & OTG1_DP_PULLUP) |
|
break; |
|
isp->phy.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; |
|
struct usb_otg *otg = isp->phy.otg; |
|
|
|
/* update ISP1301 transceiver 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->phy.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->phy.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->phy.otg->state) { |
|
case OTG_STATE_A_IDLE: |
|
if (!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->phy.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->phy.otg->state = OTG_STATE_A_VBUS_ERR; |
|
|
|
omap_writew(A_VBUS_ERR, OTG_IRQ_SRC); |
|
ret = IRQ_HANDLED; |
|
|
|
/* switch driver; the transceiver 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->phy.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 (otg->host) { |
|
switch (isp->phy.otg->state) { |
|
case OTG_STATE_B_WAIT_ACON: |
|
isp->phy.otg->state = OTG_STATE_B_HOST; |
|
pr_debug(" --> b_host\n"); |
|
kick = 1; |
|
break; |
|
case OTG_STATE_A_WAIT_BCON: |
|
isp->phy.otg->state = OTG_STATE_A_HOST; |
|
pr_debug(" --> a_host\n"); |
|
break; |
|
case OTG_STATE_A_PERIPHERAL: |
|
isp->phy.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(otg->host, otg->host->otg_port); |
|
} |
|
|
|
check_state(isp, __func__); |
|
return ret; |
|
} |
|
|
|
static struct platform_device *otg_dev; |
|
|
|
static int isp1301_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 = { |
|
.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, |
|
0, 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->phy.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->phy.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) |
|
{ |
|
struct usb_otg *otg = isp->phy.otg; |
|
u8 isp_stat, isp_bstat; |
|
enum usb_otg_state state = isp->phy.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 (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->phy.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->phy.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(otg->gadget); |
|
break; |
|
default: |
|
break; |
|
} |
|
if (state != OTG_STATE_A_IDLE) |
|
a_idle(isp, "id"); |
|
if (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 (otg->default_a) { |
|
switch (state) { |
|
default: |
|
isp->phy.otg->state = OTG_STATE_A_WAIT_VFALL; |
|
break; |
|
case OTG_STATE_A_WAIT_VFALL: |
|
state = OTG_STATE_A_IDLE; |
|
/* hub_wq 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->phy.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->phy.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 (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->phy.otg->state) |
|
pr_debug(" isp, %s -> %s\n", |
|
usb_otg_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->phy.otg->state) { |
|
case OTG_STATE_A_WAIT_BCON: |
|
case OTG_STATE_A_WAIT_VRISE: |
|
isp->phy.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->phy.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(struct timer_list *t) |
|
{ |
|
struct isp1301 *isp = from_timer(isp, t, timer); |
|
|
|
isp1301_defer_work(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->phy.otg); |
|
kfree (isp); |
|
} |
|
|
|
static struct isp1301 *the_transceiver; |
|
|
|
static int 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 |
|
set_bit(WORK_STOP, &isp->todo); |
|
del_timer_sync(&isp->timer); |
|
flush_work(&isp->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); |
|
isp1301_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 usb_otg *otg, struct usb_bus *host) |
|
{ |
|
struct isp1301 *isp = container_of(otg->usb_phy, struct isp1301, phy); |
|
|
|
if (isp != the_transceiver) |
|
return -ENODEV; |
|
|
|
if (!host) { |
|
omap_writew(0, OTG_IRQ_EN); |
|
power_down(isp); |
|
otg->host = NULL; |
|
return 0; |
|
} |
|
|
|
#ifdef CONFIG_USB_OTG |
|
otg->host = host; |
|
dev_dbg(&isp->client->dev, "registered host\n"); |
|
host_suspend(isp); |
|
if (otg->gadget) |
|
return isp1301_otg_enable(isp); |
|
return 0; |
|
|
|
#elif !IS_ENABLED(CONFIG_USB_OMAP) |
|
// FIXME update its refcount |
|
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 usb_otg *otg, struct usb_gadget *gadget) |
|
{ |
|
struct isp1301 *isp = container_of(otg->usb_phy, struct isp1301, phy); |
|
|
|
if (isp != the_transceiver) |
|
return -ENODEV; |
|
|
|
if (!gadget) { |
|
omap_writew(0, OTG_IRQ_EN); |
|
if (!otg->default_a) |
|
enable_vbus_draw(isp, 0); |
|
usb_gadget_vbus_disconnect(otg->gadget); |
|
otg->gadget = NULL; |
|
power_down(isp); |
|
return 0; |
|
} |
|
|
|
#ifdef CONFIG_USB_OTG |
|
otg->gadget = gadget; |
|
dev_dbg(&isp->client->dev, "registered gadget\n"); |
|
/* gadget driver may be suspended until vbus_connect () */ |
|
if (otg->host) |
|
return isp1301_otg_enable(isp); |
|
return 0; |
|
|
|
#elif !defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OHCI_HCD_MODULE) |
|
otg->gadget = gadget; |
|
// FIXME update its refcount |
|
|
|
{ |
|
u32 l; |
|
|
|
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->phy.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 usb_phy *dev, unsigned mA) |
|
{ |
|
if (!the_transceiver) |
|
return -ENODEV; |
|
if (dev->otg->state == OTG_STATE_B_PERIPHERAL) |
|
enable_vbus_draw(the_transceiver, mA); |
|
return 0; |
|
} |
|
|
|
static int |
|
isp1301_start_srp(struct usb_otg *otg) |
|
{ |
|
struct isp1301 *isp = container_of(otg->usb_phy, struct isp1301, phy); |
|
u32 otg_ctrl; |
|
|
|
if (isp != the_transceiver || isp->phy.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->phy.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 usb_otg *otg) |
|
{ |
|
#ifdef CONFIG_USB_OTG |
|
struct isp1301 *isp = container_of(otg->usb_phy, struct isp1301, phy); |
|
u32 l; |
|
|
|
if (isp != the_transceiver) |
|
return -ENODEV; |
|
if (otg->default_a && (otg->host == NULL || !otg->host->b_hnp_enable)) |
|
return -ENOTCONN; |
|
if (!otg->default_a && (otg->gadget == NULL |
|
|| !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->phy.otg->state) { |
|
case OTG_STATE_B_HOST: |
|
isp->phy.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(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 |
|
isp1301_probe(struct i2c_client *i2c, const struct i2c_device_id *id) |
|
{ |
|
int status; |
|
struct isp1301 *isp; |
|
int irq; |
|
|
|
if (the_transceiver) |
|
return 0; |
|
|
|
isp = kzalloc(sizeof *isp, GFP_KERNEL); |
|
if (!isp) |
|
return 0; |
|
|
|
isp->phy.otg = kzalloc(sizeof *isp->phy.otg, GFP_KERNEL); |
|
if (!isp->phy.otg) { |
|
kfree(isp); |
|
return 0; |
|
} |
|
|
|
INIT_WORK(&isp->work, isp1301_work); |
|
timer_setup(&isp->timer, isp1301_timer, 0); |
|
|
|
i2c_set_clientdata(i2c, isp); |
|
isp->client = i2c; |
|
|
|
/* verify the chip (shouldn't be necessary) */ |
|
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()) { |
|
struct gpio_desc *gpiod; |
|
|
|
/* 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); |
|
|
|
gpiod = devm_gpiod_get(&i2c->dev, NULL, GPIOD_IN); |
|
if (IS_ERR(gpiod)) { |
|
dev_err(&i2c->dev, "cannot obtain H2 GPIO\n"); |
|
goto fail; |
|
} |
|
gpiod_set_consumer_name(gpiod, "isp1301"); |
|
irq = gpiod_to_irq(gpiod); |
|
isp->irq_type = IRQF_TRIGGER_FALLING; |
|
} else { |
|
irq = i2c->irq; |
|
} |
|
|
|
status = request_irq(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->phy.dev = &i2c->dev; |
|
isp->phy.label = DRIVER_NAME; |
|
isp->phy.set_power = isp1301_set_power; |
|
|
|
isp->phy.otg->usb_phy = &isp->phy; |
|
isp->phy.otg->set_host = isp1301_set_host; |
|
isp->phy.otg->set_peripheral = isp1301_set_peripheral; |
|
isp->phy.otg->start_srp = isp1301_start_srp; |
|
isp->phy.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 = usb_add_phy(&isp->phy, USB_PHY_TYPE_USB2); |
|
if (status < 0) |
|
dev_err(&i2c->dev, "can't register transceiver, %d\n", |
|
status); |
|
|
|
return 0; |
|
|
|
fail: |
|
kfree(isp->phy.otg); |
|
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 = isp1301_remove, |
|
.id_table = isp1301_id, |
|
}; |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
static int __init isp_init(void) |
|
{ |
|
return i2c_add_driver(&isp1301_driver); |
|
} |
|
subsys_initcall(isp_init); |
|
|
|
static void __exit isp_exit(void) |
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{ |
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if (the_transceiver) |
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usb_remove_phy(&the_transceiver->phy); |
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i2c_del_driver(&isp1301_driver); |
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} |
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module_exit(isp_exit); |
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