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1331 lines
30 KiB
1331 lines
30 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* MAX3420 Device Controller driver for USB. |
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* |
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* Author: Jaswinder Singh Brar <[email protected]> |
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* (C) Copyright 2019-2020 Linaro Ltd |
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* |
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* Based on: |
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* o MAX3420E datasheet |
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* https://datasheets.maximintegrated.com/en/ds/MAX3420E.pdf |
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* o MAX342{0,1}E Programming Guides |
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* https://pdfserv.maximintegrated.com/en/an/AN3598.pdf |
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* https://pdfserv.maximintegrated.com/en/an/AN3785.pdf |
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*/ |
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|
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#include <linux/delay.h> |
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#include <linux/device.h> |
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#include <linux/interrupt.h> |
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#include <linux/io.h> |
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#include <linux/module.h> |
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#include <linux/bitfield.h> |
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#include <linux/of_address.h> |
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#include <linux/of_device.h> |
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#include <linux/of_platform.h> |
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#include <linux/of_irq.h> |
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#include <linux/prefetch.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/spi/spi.h> |
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#include <linux/gpio/consumer.h> |
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|
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#define MAX3420_MAX_EPS 4 |
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#define MAX3420_EP_MAX_PACKET 64 /* Same for all Endpoints */ |
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#define MAX3420_EPNAME_SIZE 16 /* Buffer size for endpoint name */ |
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|
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#define MAX3420_ACKSTAT BIT(0) |
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|
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#define MAX3420_SPI_DIR_RD 0 /* read register from MAX3420 */ |
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#define MAX3420_SPI_DIR_WR 1 /* write register to MAX3420 */ |
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|
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/* SPI commands: */ |
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#define MAX3420_SPI_DIR_SHIFT 1 |
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#define MAX3420_SPI_REG_SHIFT 3 |
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|
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#define MAX3420_REG_EP0FIFO 0 |
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#define MAX3420_REG_EP1FIFO 1 |
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#define MAX3420_REG_EP2FIFO 2 |
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#define MAX3420_REG_EP3FIFO 3 |
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#define MAX3420_REG_SUDFIFO 4 |
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#define MAX3420_REG_EP0BC 5 |
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#define MAX3420_REG_EP1BC 6 |
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#define MAX3420_REG_EP2BC 7 |
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#define MAX3420_REG_EP3BC 8 |
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|
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#define MAX3420_REG_EPSTALLS 9 |
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#define ACKSTAT BIT(6) |
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#define STLSTAT BIT(5) |
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#define STLEP3IN BIT(4) |
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#define STLEP2IN BIT(3) |
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#define STLEP1OUT BIT(2) |
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#define STLEP0OUT BIT(1) |
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#define STLEP0IN BIT(0) |
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|
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#define MAX3420_REG_CLRTOGS 10 |
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#define EP3DISAB BIT(7) |
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#define EP2DISAB BIT(6) |
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#define EP1DISAB BIT(5) |
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#define CTGEP3IN BIT(4) |
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#define CTGEP2IN BIT(3) |
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#define CTGEP1OUT BIT(2) |
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|
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#define MAX3420_REG_EPIRQ 11 |
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#define MAX3420_REG_EPIEN 12 |
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#define SUDAVIRQ BIT(5) |
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#define IN3BAVIRQ BIT(4) |
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#define IN2BAVIRQ BIT(3) |
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#define OUT1DAVIRQ BIT(2) |
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#define OUT0DAVIRQ BIT(1) |
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#define IN0BAVIRQ BIT(0) |
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|
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#define MAX3420_REG_USBIRQ 13 |
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#define MAX3420_REG_USBIEN 14 |
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#define OSCOKIRQ BIT(0) |
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#define RWUDNIRQ BIT(1) |
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#define BUSACTIRQ BIT(2) |
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#define URESIRQ BIT(3) |
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#define SUSPIRQ BIT(4) |
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#define NOVBUSIRQ BIT(5) |
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#define VBUSIRQ BIT(6) |
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#define URESDNIRQ BIT(7) |
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|
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#define MAX3420_REG_USBCTL 15 |
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#define HOSCSTEN BIT(7) |
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#define VBGATE BIT(6) |
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#define CHIPRES BIT(5) |
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#define PWRDOWN BIT(4) |
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#define CONNECT BIT(3) |
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#define SIGRWU BIT(2) |
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|
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#define MAX3420_REG_CPUCTL 16 |
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#define IE BIT(0) |
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|
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#define MAX3420_REG_PINCTL 17 |
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#define EP3INAK BIT(7) |
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#define EP2INAK BIT(6) |
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#define EP0INAK BIT(5) |
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#define FDUPSPI BIT(4) |
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#define INTLEVEL BIT(3) |
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#define POSINT BIT(2) |
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#define GPXB BIT(1) |
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#define GPXA BIT(0) |
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#define MAX3420_REG_REVISION 18 |
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|
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#define MAX3420_REG_FNADDR 19 |
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#define FNADDR_MASK 0x7f |
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|
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#define MAX3420_REG_IOPINS 20 |
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#define MAX3420_REG_IOPINS2 21 |
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#define MAX3420_REG_GPINIRQ 22 |
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#define MAX3420_REG_GPINIEN 23 |
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#define MAX3420_REG_GPINPOL 24 |
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#define MAX3420_REG_HIRQ 25 |
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#define MAX3420_REG_HIEN 26 |
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#define MAX3420_REG_MODE 27 |
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#define MAX3420_REG_PERADDR 28 |
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#define MAX3420_REG_HCTL 29 |
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#define MAX3420_REG_HXFR 30 |
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#define MAX3420_REG_HRSL 31 |
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|
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#define ENABLE_IRQ BIT(0) |
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#define IOPIN_UPDATE BIT(1) |
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#define REMOTE_WAKEUP BIT(2) |
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#define CONNECT_HOST GENMASK(4, 3) |
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#define HCONNECT (1 << 3) |
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#define HDISCONNECT (3 << 3) |
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#define UDC_START GENMASK(6, 5) |
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#define START (1 << 5) |
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#define STOP (3 << 5) |
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#define ENABLE_EP GENMASK(8, 7) |
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#define ENABLE (1 << 7) |
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#define DISABLE (3 << 7) |
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#define STALL_EP GENMASK(10, 9) |
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#define STALL (1 << 9) |
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#define UNSTALL (3 << 9) |
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|
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#define MAX3420_CMD(c) FIELD_PREP(GENMASK(7, 3), c) |
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#define MAX3420_SPI_CMD_RD(c) (MAX3420_CMD(c) | (0 << 1)) |
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#define MAX3420_SPI_CMD_WR(c) (MAX3420_CMD(c) | (1 << 1)) |
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struct max3420_req { |
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struct usb_request usb_req; |
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struct list_head queue; |
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struct max3420_ep *ep; |
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}; |
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struct max3420_ep { |
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struct usb_ep ep_usb; |
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struct max3420_udc *udc; |
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struct list_head queue; |
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char name[MAX3420_EPNAME_SIZE]; |
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unsigned int maxpacket; |
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spinlock_t lock; |
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int halted; |
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u32 todo; |
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int id; |
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}; |
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struct max3420_udc { |
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struct usb_gadget gadget; |
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struct max3420_ep ep[MAX3420_MAX_EPS]; |
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struct usb_gadget_driver *driver; |
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struct task_struct *thread_task; |
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int remote_wkp, is_selfpowered; |
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bool vbus_active, softconnect; |
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struct usb_ctrlrequest setup; |
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struct mutex spi_bus_mutex; |
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struct max3420_req ep0req; |
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struct spi_device *spi; |
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struct device *dev; |
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spinlock_t lock; |
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bool suspended; |
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u8 ep0buf[64]; |
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u32 todo; |
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}; |
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#define to_max3420_req(r) container_of((r), struct max3420_req, usb_req) |
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#define to_max3420_ep(e) container_of((e), struct max3420_ep, ep_usb) |
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#define to_udc(g) container_of((g), struct max3420_udc, gadget) |
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|
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#define DRIVER_DESC "MAX3420 USB Device-Mode Driver" |
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static const char driver_name[] = "max3420-udc"; |
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|
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/* Control endpoint configuration.*/ |
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static const struct usb_endpoint_descriptor ep0_desc = { |
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.bEndpointAddress = USB_DIR_OUT, |
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.bmAttributes = USB_ENDPOINT_XFER_CONTROL, |
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.wMaxPacketSize = cpu_to_le16(MAX3420_EP_MAX_PACKET), |
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}; |
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static void spi_ack_ctrl(struct max3420_udc *udc) |
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{ |
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struct spi_device *spi = udc->spi; |
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struct spi_transfer transfer; |
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struct spi_message msg; |
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u8 txdata[1]; |
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memset(&transfer, 0, sizeof(transfer)); |
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spi_message_init(&msg); |
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txdata[0] = MAX3420_ACKSTAT; |
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transfer.tx_buf = txdata; |
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transfer.len = 1; |
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spi_message_add_tail(&transfer, &msg); |
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spi_sync(spi, &msg); |
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} |
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static u8 spi_rd8_ack(struct max3420_udc *udc, u8 reg, int actstat) |
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{ |
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struct spi_device *spi = udc->spi; |
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struct spi_transfer transfer; |
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struct spi_message msg; |
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u8 txdata[2], rxdata[2]; |
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memset(&transfer, 0, sizeof(transfer)); |
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spi_message_init(&msg); |
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txdata[0] = MAX3420_SPI_CMD_RD(reg) | (actstat ? MAX3420_ACKSTAT : 0); |
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transfer.tx_buf = txdata; |
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transfer.rx_buf = rxdata; |
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transfer.len = 2; |
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spi_message_add_tail(&transfer, &msg); |
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spi_sync(spi, &msg); |
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return rxdata[1]; |
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} |
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static u8 spi_rd8(struct max3420_udc *udc, u8 reg) |
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{ |
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return spi_rd8_ack(udc, reg, 0); |
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} |
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static void spi_wr8_ack(struct max3420_udc *udc, u8 reg, u8 val, int actstat) |
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{ |
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struct spi_device *spi = udc->spi; |
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struct spi_transfer transfer; |
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struct spi_message msg; |
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u8 txdata[2]; |
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memset(&transfer, 0, sizeof(transfer)); |
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spi_message_init(&msg); |
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txdata[0] = MAX3420_SPI_CMD_WR(reg) | (actstat ? MAX3420_ACKSTAT : 0); |
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txdata[1] = val; |
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transfer.tx_buf = txdata; |
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transfer.len = 2; |
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spi_message_add_tail(&transfer, &msg); |
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spi_sync(spi, &msg); |
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} |
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static void spi_wr8(struct max3420_udc *udc, u8 reg, u8 val) |
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{ |
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spi_wr8_ack(udc, reg, val, 0); |
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} |
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static void spi_rd_buf(struct max3420_udc *udc, u8 reg, void *buf, u8 len) |
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{ |
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struct spi_device *spi = udc->spi; |
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struct spi_transfer transfer; |
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struct spi_message msg; |
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u8 local_buf[MAX3420_EP_MAX_PACKET + 1] = {}; |
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memset(&transfer, 0, sizeof(transfer)); |
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spi_message_init(&msg); |
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local_buf[0] = MAX3420_SPI_CMD_RD(reg); |
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transfer.tx_buf = &local_buf[0]; |
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transfer.rx_buf = &local_buf[0]; |
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transfer.len = len + 1; |
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spi_message_add_tail(&transfer, &msg); |
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spi_sync(spi, &msg); |
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memcpy(buf, &local_buf[1], len); |
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} |
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static void spi_wr_buf(struct max3420_udc *udc, u8 reg, void *buf, u8 len) |
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{ |
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struct spi_device *spi = udc->spi; |
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struct spi_transfer transfer; |
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struct spi_message msg; |
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u8 local_buf[MAX3420_EP_MAX_PACKET + 1] = {}; |
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memset(&transfer, 0, sizeof(transfer)); |
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spi_message_init(&msg); |
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local_buf[0] = MAX3420_SPI_CMD_WR(reg); |
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memcpy(&local_buf[1], buf, len); |
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transfer.tx_buf = local_buf; |
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transfer.len = len + 1; |
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spi_message_add_tail(&transfer, &msg); |
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spi_sync(spi, &msg); |
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} |
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static int spi_max3420_enable(struct max3420_ep *ep) |
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{ |
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struct max3420_udc *udc = ep->udc; |
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unsigned long flags; |
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u8 epdis, epien; |
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int todo; |
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spin_lock_irqsave(&ep->lock, flags); |
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todo = ep->todo & ENABLE_EP; |
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ep->todo &= ~ENABLE_EP; |
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spin_unlock_irqrestore(&ep->lock, flags); |
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if (!todo || ep->id == 0) |
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return false; |
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epien = spi_rd8(udc, MAX3420_REG_EPIEN); |
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epdis = spi_rd8(udc, MAX3420_REG_CLRTOGS); |
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if (todo == ENABLE) { |
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epdis &= ~BIT(ep->id + 4); |
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epien |= BIT(ep->id + 1); |
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} else { |
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epdis |= BIT(ep->id + 4); |
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epien &= ~BIT(ep->id + 1); |
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} |
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spi_wr8(udc, MAX3420_REG_CLRTOGS, epdis); |
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spi_wr8(udc, MAX3420_REG_EPIEN, epien); |
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return true; |
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} |
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static int spi_max3420_stall(struct max3420_ep *ep) |
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{ |
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struct max3420_udc *udc = ep->udc; |
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unsigned long flags; |
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u8 epstalls; |
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int todo; |
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spin_lock_irqsave(&ep->lock, flags); |
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todo = ep->todo & STALL_EP; |
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ep->todo &= ~STALL_EP; |
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spin_unlock_irqrestore(&ep->lock, flags); |
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if (!todo || ep->id == 0) |
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return false; |
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epstalls = spi_rd8(udc, MAX3420_REG_EPSTALLS); |
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if (todo == STALL) { |
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ep->halted = 1; |
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epstalls |= BIT(ep->id + 1); |
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} else { |
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u8 clrtogs; |
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ep->halted = 0; |
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epstalls &= ~BIT(ep->id + 1); |
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clrtogs = spi_rd8(udc, MAX3420_REG_CLRTOGS); |
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clrtogs |= BIT(ep->id + 1); |
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spi_wr8(udc, MAX3420_REG_CLRTOGS, clrtogs); |
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} |
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spi_wr8(udc, MAX3420_REG_EPSTALLS, epstalls | ACKSTAT); |
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return true; |
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} |
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static int spi_max3420_rwkup(struct max3420_udc *udc) |
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{ |
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unsigned long flags; |
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int wake_remote; |
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u8 usbctl; |
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spin_lock_irqsave(&udc->lock, flags); |
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wake_remote = udc->todo & REMOTE_WAKEUP; |
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udc->todo &= ~REMOTE_WAKEUP; |
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spin_unlock_irqrestore(&udc->lock, flags); |
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if (!wake_remote || !udc->suspended) |
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return false; |
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/* Set Remote-WkUp Signal*/ |
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usbctl = spi_rd8(udc, MAX3420_REG_USBCTL); |
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usbctl |= SIGRWU; |
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spi_wr8(udc, MAX3420_REG_USBCTL, usbctl); |
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msleep_interruptible(5); |
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/* Clear Remote-WkUp Signal*/ |
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usbctl = spi_rd8(udc, MAX3420_REG_USBCTL); |
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usbctl &= ~SIGRWU; |
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spi_wr8(udc, MAX3420_REG_USBCTL, usbctl); |
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udc->suspended = false; |
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return true; |
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} |
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static void max3420_nuke(struct max3420_ep *ep, int status); |
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static void __max3420_stop(struct max3420_udc *udc) |
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{ |
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u8 val; |
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int i; |
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/* clear all pending requests */ |
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for (i = 1; i < MAX3420_MAX_EPS; i++) |
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max3420_nuke(&udc->ep[i], -ECONNRESET); |
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|
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/* Disable IRQ to CPU */ |
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spi_wr8(udc, MAX3420_REG_CPUCTL, 0); |
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val = spi_rd8(udc, MAX3420_REG_USBCTL); |
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val |= PWRDOWN; |
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if (udc->is_selfpowered) |
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val &= ~HOSCSTEN; |
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else |
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val |= HOSCSTEN; |
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spi_wr8(udc, MAX3420_REG_USBCTL, val); |
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} |
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static void __max3420_start(struct max3420_udc *udc) |
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{ |
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u8 val; |
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|
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/* Need this delay if bus-powered, |
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* but even for self-powered it helps stability |
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*/ |
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msleep_interruptible(250); |
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/* configure SPI */ |
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spi_wr8(udc, MAX3420_REG_PINCTL, FDUPSPI); |
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|
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/* Chip Reset */ |
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spi_wr8(udc, MAX3420_REG_USBCTL, CHIPRES); |
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msleep_interruptible(5); |
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spi_wr8(udc, MAX3420_REG_USBCTL, 0); |
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|
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/* Poll for OSC to stabilize */ |
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while (1) { |
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val = spi_rd8(udc, MAX3420_REG_USBIRQ); |
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if (val & OSCOKIRQ) |
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break; |
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cond_resched(); |
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} |
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|
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/* Enable PULL-UP only when Vbus detected */ |
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val = spi_rd8(udc, MAX3420_REG_USBCTL); |
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val |= VBGATE | CONNECT; |
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spi_wr8(udc, MAX3420_REG_USBCTL, val); |
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|
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val = URESDNIRQ | URESIRQ; |
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if (udc->is_selfpowered) |
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val |= NOVBUSIRQ; |
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spi_wr8(udc, MAX3420_REG_USBIEN, val); |
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|
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/* Enable only EP0 interrupts */ |
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val = IN0BAVIRQ | OUT0DAVIRQ | SUDAVIRQ; |
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spi_wr8(udc, MAX3420_REG_EPIEN, val); |
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|
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/* Enable IRQ to CPU */ |
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spi_wr8(udc, MAX3420_REG_CPUCTL, IE); |
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} |
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static int max3420_start(struct max3420_udc *udc) |
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{ |
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unsigned long flags; |
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int todo; |
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|
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spin_lock_irqsave(&udc->lock, flags); |
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todo = udc->todo & UDC_START; |
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udc->todo &= ~UDC_START; |
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spin_unlock_irqrestore(&udc->lock, flags); |
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|
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if (!todo) |
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return false; |
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if (udc->vbus_active && udc->softconnect) |
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__max3420_start(udc); |
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else |
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__max3420_stop(udc); |
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|
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return true; |
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} |
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|
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static irqreturn_t max3420_vbus_handler(int irq, void *dev_id) |
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{ |
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struct max3420_udc *udc = dev_id; |
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unsigned long flags; |
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|
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spin_lock_irqsave(&udc->lock, flags); |
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/* its a vbus change interrupt */ |
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udc->vbus_active = !udc->vbus_active; |
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udc->todo |= UDC_START; |
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usb_udc_vbus_handler(&udc->gadget, udc->vbus_active); |
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usb_gadget_set_state(&udc->gadget, udc->vbus_active |
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? USB_STATE_POWERED : USB_STATE_NOTATTACHED); |
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spin_unlock_irqrestore(&udc->lock, flags); |
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|
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if (udc->thread_task) |
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wake_up_process(udc->thread_task); |
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|
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return IRQ_HANDLED; |
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} |
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|
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static irqreturn_t max3420_irq_handler(int irq, void *dev_id) |
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{ |
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struct max3420_udc *udc = dev_id; |
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struct spi_device *spi = udc->spi; |
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unsigned long flags; |
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|
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spin_lock_irqsave(&udc->lock, flags); |
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if ((udc->todo & ENABLE_IRQ) == 0) { |
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disable_irq_nosync(spi->irq); |
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udc->todo |= ENABLE_IRQ; |
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} |
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spin_unlock_irqrestore(&udc->lock, flags); |
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|
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if (udc->thread_task) |
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wake_up_process(udc->thread_task); |
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|
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return IRQ_HANDLED; |
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} |
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|
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static void max3420_getstatus(struct max3420_udc *udc) |
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{ |
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struct max3420_ep *ep; |
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u16 status = 0; |
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|
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switch (udc->setup.bRequestType & USB_RECIP_MASK) { |
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case USB_RECIP_DEVICE: |
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/* Get device status */ |
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status = udc->gadget.is_selfpowered << USB_DEVICE_SELF_POWERED; |
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status |= (udc->remote_wkp << USB_DEVICE_REMOTE_WAKEUP); |
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break; |
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case USB_RECIP_INTERFACE: |
|
if (udc->driver->setup(&udc->gadget, &udc->setup) < 0) |
|
goto stall; |
|
break; |
|
case USB_RECIP_ENDPOINT: |
|
ep = &udc->ep[udc->setup.wIndex & USB_ENDPOINT_NUMBER_MASK]; |
|
if (udc->setup.wIndex & USB_DIR_IN) { |
|
if (!ep->ep_usb.caps.dir_in) |
|
goto stall; |
|
} else { |
|
if (!ep->ep_usb.caps.dir_out) |
|
goto stall; |
|
} |
|
if (ep->halted) |
|
status = 1 << USB_ENDPOINT_HALT; |
|
break; |
|
default: |
|
goto stall; |
|
} |
|
|
|
status = cpu_to_le16(status); |
|
spi_wr_buf(udc, MAX3420_REG_EP0FIFO, &status, 2); |
|
spi_wr8_ack(udc, MAX3420_REG_EP0BC, 2, 1); |
|
return; |
|
stall: |
|
dev_err(udc->dev, "Can't respond to getstatus request\n"); |
|
spi_wr8(udc, MAX3420_REG_EPSTALLS, STLEP0IN | STLEP0OUT | STLSTAT); |
|
} |
|
|
|
static void max3420_set_clear_feature(struct max3420_udc *udc) |
|
{ |
|
struct max3420_ep *ep; |
|
int set = udc->setup.bRequest == USB_REQ_SET_FEATURE; |
|
unsigned long flags; |
|
int id; |
|
|
|
switch (udc->setup.bRequestType) { |
|
case USB_RECIP_DEVICE: |
|
if (udc->setup.wValue != USB_DEVICE_REMOTE_WAKEUP) |
|
break; |
|
|
|
if (udc->setup.bRequest == USB_REQ_SET_FEATURE) |
|
udc->remote_wkp = 1; |
|
else |
|
udc->remote_wkp = 0; |
|
|
|
return spi_ack_ctrl(udc); |
|
|
|
case USB_RECIP_ENDPOINT: |
|
if (udc->setup.wValue != USB_ENDPOINT_HALT) |
|
break; |
|
|
|
id = udc->setup.wIndex & USB_ENDPOINT_NUMBER_MASK; |
|
ep = &udc->ep[id]; |
|
|
|
spin_lock_irqsave(&ep->lock, flags); |
|
ep->todo &= ~STALL_EP; |
|
if (set) |
|
ep->todo |= STALL; |
|
else |
|
ep->todo |= UNSTALL; |
|
spin_unlock_irqrestore(&ep->lock, flags); |
|
|
|
spi_max3420_stall(ep); |
|
return; |
|
default: |
|
break; |
|
} |
|
|
|
dev_err(udc->dev, "Can't respond to SET/CLEAR FEATURE\n"); |
|
spi_wr8(udc, MAX3420_REG_EPSTALLS, STLEP0IN | STLEP0OUT | STLSTAT); |
|
} |
|
|
|
static void max3420_handle_setup(struct max3420_udc *udc) |
|
{ |
|
struct usb_ctrlrequest setup; |
|
|
|
spi_rd_buf(udc, MAX3420_REG_SUDFIFO, (void *)&setup, 8); |
|
|
|
udc->setup = setup; |
|
udc->setup.wValue = cpu_to_le16(setup.wValue); |
|
udc->setup.wIndex = cpu_to_le16(setup.wIndex); |
|
udc->setup.wLength = cpu_to_le16(setup.wLength); |
|
|
|
switch (udc->setup.bRequest) { |
|
case USB_REQ_GET_STATUS: |
|
/* Data+Status phase form udc */ |
|
if ((udc->setup.bRequestType & |
|
(USB_DIR_IN | USB_TYPE_MASK)) != |
|
(USB_DIR_IN | USB_TYPE_STANDARD)) { |
|
break; |
|
} |
|
return max3420_getstatus(udc); |
|
case USB_REQ_SET_ADDRESS: |
|
/* Status phase from udc */ |
|
if (udc->setup.bRequestType != (USB_DIR_OUT | |
|
USB_TYPE_STANDARD | USB_RECIP_DEVICE)) { |
|
break; |
|
} |
|
spi_rd8_ack(udc, MAX3420_REG_FNADDR, 1); |
|
dev_dbg(udc->dev, "Assigned Address=%d\n", udc->setup.wValue); |
|
return; |
|
case USB_REQ_CLEAR_FEATURE: |
|
case USB_REQ_SET_FEATURE: |
|
/* Requests with no data phase, status phase from udc */ |
|
if ((udc->setup.bRequestType & USB_TYPE_MASK) |
|
!= USB_TYPE_STANDARD) |
|
break; |
|
return max3420_set_clear_feature(udc); |
|
default: |
|
break; |
|
} |
|
|
|
if (udc->driver->setup(&udc->gadget, &setup) < 0) { |
|
/* Stall EP0 */ |
|
spi_wr8(udc, MAX3420_REG_EPSTALLS, |
|
STLEP0IN | STLEP0OUT | STLSTAT); |
|
} |
|
} |
|
|
|
static void max3420_req_done(struct max3420_req *req, int status) |
|
{ |
|
struct max3420_ep *ep = req->ep; |
|
struct max3420_udc *udc = ep->udc; |
|
|
|
if (req->usb_req.status == -EINPROGRESS) |
|
req->usb_req.status = status; |
|
else |
|
status = req->usb_req.status; |
|
|
|
if (status && status != -ESHUTDOWN) |
|
dev_err(udc->dev, "%s done %p, status %d\n", |
|
ep->ep_usb.name, req, status); |
|
|
|
if (req->usb_req.complete) |
|
req->usb_req.complete(&ep->ep_usb, &req->usb_req); |
|
} |
|
|
|
static int max3420_do_data(struct max3420_udc *udc, int ep_id, int in) |
|
{ |
|
struct max3420_ep *ep = &udc->ep[ep_id]; |
|
struct max3420_req *req; |
|
int done, length, psz; |
|
void *buf; |
|
|
|
if (list_empty(&ep->queue)) |
|
return false; |
|
|
|
req = list_first_entry(&ep->queue, struct max3420_req, queue); |
|
buf = req->usb_req.buf + req->usb_req.actual; |
|
|
|
psz = ep->ep_usb.maxpacket; |
|
length = req->usb_req.length - req->usb_req.actual; |
|
length = min(length, psz); |
|
|
|
if (length == 0) { |
|
done = 1; |
|
goto xfer_done; |
|
} |
|
|
|
done = 0; |
|
if (in) { |
|
prefetch(buf); |
|
spi_wr_buf(udc, MAX3420_REG_EP0FIFO + ep_id, buf, length); |
|
spi_wr8(udc, MAX3420_REG_EP0BC + ep_id, length); |
|
if (length < psz) |
|
done = 1; |
|
} else { |
|
psz = spi_rd8(udc, MAX3420_REG_EP0BC + ep_id); |
|
length = min(length, psz); |
|
prefetchw(buf); |
|
spi_rd_buf(udc, MAX3420_REG_EP0FIFO + ep_id, buf, length); |
|
if (length < ep->ep_usb.maxpacket) |
|
done = 1; |
|
} |
|
|
|
req->usb_req.actual += length; |
|
|
|
if (req->usb_req.actual == req->usb_req.length) |
|
done = 1; |
|
|
|
xfer_done: |
|
if (done) { |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&ep->lock, flags); |
|
list_del_init(&req->queue); |
|
spin_unlock_irqrestore(&ep->lock, flags); |
|
|
|
if (ep_id == 0) |
|
spi_ack_ctrl(udc); |
|
|
|
max3420_req_done(req, 0); |
|
} |
|
|
|
return true; |
|
} |
|
|
|
static int max3420_handle_irqs(struct max3420_udc *udc) |
|
{ |
|
u8 epien, epirq, usbirq, usbien, reg[4]; |
|
bool ret = false; |
|
|
|
spi_rd_buf(udc, MAX3420_REG_EPIRQ, reg, 4); |
|
epirq = reg[0]; |
|
epien = reg[1]; |
|
usbirq = reg[2]; |
|
usbien = reg[3]; |
|
|
|
usbirq &= usbien; |
|
epirq &= epien; |
|
|
|
if (epirq & SUDAVIRQ) { |
|
spi_wr8(udc, MAX3420_REG_EPIRQ, SUDAVIRQ); |
|
max3420_handle_setup(udc); |
|
return true; |
|
} |
|
|
|
if (usbirq & VBUSIRQ) { |
|
spi_wr8(udc, MAX3420_REG_USBIRQ, VBUSIRQ); |
|
dev_dbg(udc->dev, "Cable plugged in\n"); |
|
return true; |
|
} |
|
|
|
if (usbirq & NOVBUSIRQ) { |
|
spi_wr8(udc, MAX3420_REG_USBIRQ, NOVBUSIRQ); |
|
dev_dbg(udc->dev, "Cable pulled out\n"); |
|
return true; |
|
} |
|
|
|
if (usbirq & URESIRQ) { |
|
spi_wr8(udc, MAX3420_REG_USBIRQ, URESIRQ); |
|
dev_dbg(udc->dev, "USB Reset - Start\n"); |
|
return true; |
|
} |
|
|
|
if (usbirq & URESDNIRQ) { |
|
spi_wr8(udc, MAX3420_REG_USBIRQ, URESDNIRQ); |
|
dev_dbg(udc->dev, "USB Reset - END\n"); |
|
spi_wr8(udc, MAX3420_REG_USBIEN, URESDNIRQ | URESIRQ); |
|
spi_wr8(udc, MAX3420_REG_EPIEN, SUDAVIRQ | IN0BAVIRQ |
|
| OUT0DAVIRQ); |
|
return true; |
|
} |
|
|
|
if (usbirq & SUSPIRQ) { |
|
spi_wr8(udc, MAX3420_REG_USBIRQ, SUSPIRQ); |
|
dev_dbg(udc->dev, "USB Suspend - Enter\n"); |
|
udc->suspended = true; |
|
return true; |
|
} |
|
|
|
if (usbirq & BUSACTIRQ) { |
|
spi_wr8(udc, MAX3420_REG_USBIRQ, BUSACTIRQ); |
|
dev_dbg(udc->dev, "USB Suspend - Exit\n"); |
|
udc->suspended = false; |
|
return true; |
|
} |
|
|
|
if (usbirq & RWUDNIRQ) { |
|
spi_wr8(udc, MAX3420_REG_USBIRQ, RWUDNIRQ); |
|
dev_dbg(udc->dev, "Asked Host to wakeup\n"); |
|
return true; |
|
} |
|
|
|
if (usbirq & OSCOKIRQ) { |
|
spi_wr8(udc, MAX3420_REG_USBIRQ, OSCOKIRQ); |
|
dev_dbg(udc->dev, "Osc stabilized, start work\n"); |
|
return true; |
|
} |
|
|
|
if (epirq & OUT0DAVIRQ && max3420_do_data(udc, 0, 0)) { |
|
spi_wr8_ack(udc, MAX3420_REG_EPIRQ, OUT0DAVIRQ, 1); |
|
ret = true; |
|
} |
|
|
|
if (epirq & IN0BAVIRQ && max3420_do_data(udc, 0, 1)) |
|
ret = true; |
|
|
|
if (epirq & OUT1DAVIRQ && max3420_do_data(udc, 1, 0)) { |
|
spi_wr8_ack(udc, MAX3420_REG_EPIRQ, OUT1DAVIRQ, 1); |
|
ret = true; |
|
} |
|
|
|
if (epirq & IN2BAVIRQ && max3420_do_data(udc, 2, 1)) |
|
ret = true; |
|
|
|
if (epirq & IN3BAVIRQ && max3420_do_data(udc, 3, 1)) |
|
ret = true; |
|
|
|
return ret; |
|
} |
|
|
|
static int max3420_thread(void *dev_id) |
|
{ |
|
struct max3420_udc *udc = dev_id; |
|
struct spi_device *spi = udc->spi; |
|
int i, loop_again = 1; |
|
unsigned long flags; |
|
|
|
while (!kthread_should_stop()) { |
|
if (!loop_again) { |
|
ktime_t kt = ns_to_ktime(1000 * 1000 * 250); /* 250ms */ |
|
|
|
set_current_state(TASK_INTERRUPTIBLE); |
|
|
|
spin_lock_irqsave(&udc->lock, flags); |
|
if (udc->todo & ENABLE_IRQ) { |
|
enable_irq(spi->irq); |
|
udc->todo &= ~ENABLE_IRQ; |
|
} |
|
spin_unlock_irqrestore(&udc->lock, flags); |
|
|
|
schedule_hrtimeout(&kt, HRTIMER_MODE_REL); |
|
} |
|
loop_again = 0; |
|
|
|
mutex_lock(&udc->spi_bus_mutex); |
|
|
|
/* If bus-vbus_active and disconnected */ |
|
if (!udc->vbus_active || !udc->softconnect) |
|
goto loop; |
|
|
|
if (max3420_start(udc)) { |
|
loop_again = 1; |
|
goto loop; |
|
} |
|
|
|
if (max3420_handle_irqs(udc)) { |
|
loop_again = 1; |
|
goto loop; |
|
} |
|
|
|
if (spi_max3420_rwkup(udc)) { |
|
loop_again = 1; |
|
goto loop; |
|
} |
|
|
|
max3420_do_data(udc, 0, 1); /* get done with the EP0 ZLP */ |
|
|
|
for (i = 1; i < MAX3420_MAX_EPS; i++) { |
|
struct max3420_ep *ep = &udc->ep[i]; |
|
|
|
if (spi_max3420_enable(ep)) |
|
loop_again = 1; |
|
if (spi_max3420_stall(ep)) |
|
loop_again = 1; |
|
} |
|
loop: |
|
mutex_unlock(&udc->spi_bus_mutex); |
|
} |
|
|
|
set_current_state(TASK_RUNNING); |
|
dev_info(udc->dev, "SPI thread exiting\n"); |
|
return 0; |
|
} |
|
|
|
static int max3420_ep_set_halt(struct usb_ep *_ep, int stall) |
|
{ |
|
struct max3420_ep *ep = to_max3420_ep(_ep); |
|
struct max3420_udc *udc = ep->udc; |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&ep->lock, flags); |
|
|
|
ep->todo &= ~STALL_EP; |
|
if (stall) |
|
ep->todo |= STALL; |
|
else |
|
ep->todo |= UNSTALL; |
|
|
|
spin_unlock_irqrestore(&ep->lock, flags); |
|
|
|
wake_up_process(udc->thread_task); |
|
|
|
dev_dbg(udc->dev, "%sStall %s\n", stall ? "" : "Un", ep->name); |
|
return 0; |
|
} |
|
|
|
static int __max3420_ep_enable(struct max3420_ep *ep, |
|
const struct usb_endpoint_descriptor *desc) |
|
{ |
|
unsigned int maxp = usb_endpoint_maxp(desc); |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&ep->lock, flags); |
|
ep->ep_usb.desc = desc; |
|
ep->ep_usb.maxpacket = maxp; |
|
|
|
ep->todo &= ~ENABLE_EP; |
|
ep->todo |= ENABLE; |
|
spin_unlock_irqrestore(&ep->lock, flags); |
|
|
|
return 0; |
|
} |
|
|
|
static int max3420_ep_enable(struct usb_ep *_ep, |
|
const struct usb_endpoint_descriptor *desc) |
|
{ |
|
struct max3420_ep *ep = to_max3420_ep(_ep); |
|
struct max3420_udc *udc = ep->udc; |
|
|
|
__max3420_ep_enable(ep, desc); |
|
|
|
wake_up_process(udc->thread_task); |
|
|
|
return 0; |
|
} |
|
|
|
static void max3420_nuke(struct max3420_ep *ep, int status) |
|
{ |
|
struct max3420_req *req, *r; |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&ep->lock, flags); |
|
|
|
list_for_each_entry_safe(req, r, &ep->queue, queue) { |
|
list_del_init(&req->queue); |
|
|
|
spin_unlock_irqrestore(&ep->lock, flags); |
|
max3420_req_done(req, status); |
|
spin_lock_irqsave(&ep->lock, flags); |
|
} |
|
|
|
spin_unlock_irqrestore(&ep->lock, flags); |
|
} |
|
|
|
static void __max3420_ep_disable(struct max3420_ep *ep) |
|
{ |
|
struct max3420_udc *udc = ep->udc; |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&ep->lock, flags); |
|
|
|
ep->ep_usb.desc = NULL; |
|
|
|
ep->todo &= ~ENABLE_EP; |
|
ep->todo |= DISABLE; |
|
|
|
spin_unlock_irqrestore(&ep->lock, flags); |
|
|
|
dev_dbg(udc->dev, "Disabled %s\n", ep->name); |
|
} |
|
|
|
static int max3420_ep_disable(struct usb_ep *_ep) |
|
{ |
|
struct max3420_ep *ep = to_max3420_ep(_ep); |
|
struct max3420_udc *udc = ep->udc; |
|
|
|
max3420_nuke(ep, -ESHUTDOWN); |
|
|
|
__max3420_ep_disable(ep); |
|
|
|
wake_up_process(udc->thread_task); |
|
|
|
return 0; |
|
} |
|
|
|
static struct usb_request *max3420_alloc_request(struct usb_ep *_ep, |
|
gfp_t gfp_flags) |
|
{ |
|
struct max3420_ep *ep = to_max3420_ep(_ep); |
|
struct max3420_req *req; |
|
|
|
req = kzalloc(sizeof(*req), gfp_flags); |
|
if (!req) |
|
return NULL; |
|
|
|
req->ep = ep; |
|
|
|
return &req->usb_req; |
|
} |
|
|
|
static void max3420_free_request(struct usb_ep *_ep, struct usb_request *_req) |
|
{ |
|
kfree(to_max3420_req(_req)); |
|
} |
|
|
|
static int max3420_ep_queue(struct usb_ep *_ep, struct usb_request *_req, |
|
gfp_t ignored) |
|
{ |
|
struct max3420_req *req = to_max3420_req(_req); |
|
struct max3420_ep *ep = to_max3420_ep(_ep); |
|
struct max3420_udc *udc = ep->udc; |
|
unsigned long flags; |
|
|
|
_req->status = -EINPROGRESS; |
|
_req->actual = 0; |
|
|
|
spin_lock_irqsave(&ep->lock, flags); |
|
list_add_tail(&req->queue, &ep->queue); |
|
spin_unlock_irqrestore(&ep->lock, flags); |
|
|
|
wake_up_process(udc->thread_task); |
|
return 0; |
|
} |
|
|
|
static int max3420_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req) |
|
{ |
|
struct max3420_req *t, *req = to_max3420_req(_req); |
|
struct max3420_ep *ep = to_max3420_ep(_ep); |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&ep->lock, flags); |
|
|
|
/* Pluck the descriptor from queue */ |
|
list_for_each_entry(t, &ep->queue, queue) |
|
if (t == req) { |
|
list_del_init(&req->queue); |
|
break; |
|
} |
|
|
|
spin_unlock_irqrestore(&ep->lock, flags); |
|
|
|
if (t == req) |
|
max3420_req_done(req, -ECONNRESET); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct usb_ep_ops max3420_ep_ops = { |
|
.enable = max3420_ep_enable, |
|
.disable = max3420_ep_disable, |
|
.alloc_request = max3420_alloc_request, |
|
.free_request = max3420_free_request, |
|
.queue = max3420_ep_queue, |
|
.dequeue = max3420_ep_dequeue, |
|
.set_halt = max3420_ep_set_halt, |
|
}; |
|
|
|
static int max3420_wakeup(struct usb_gadget *gadget) |
|
{ |
|
struct max3420_udc *udc = to_udc(gadget); |
|
unsigned long flags; |
|
int ret = -EINVAL; |
|
|
|
spin_lock_irqsave(&udc->lock, flags); |
|
|
|
/* Only if wakeup allowed by host */ |
|
if (udc->remote_wkp) { |
|
udc->todo |= REMOTE_WAKEUP; |
|
ret = 0; |
|
} |
|
|
|
spin_unlock_irqrestore(&udc->lock, flags); |
|
|
|
if (udc->thread_task) |
|
wake_up_process(udc->thread_task); |
|
return ret; |
|
} |
|
|
|
static int max3420_udc_start(struct usb_gadget *gadget, |
|
struct usb_gadget_driver *driver) |
|
{ |
|
struct max3420_udc *udc = to_udc(gadget); |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&udc->lock, flags); |
|
/* hook up the driver */ |
|
driver->driver.bus = NULL; |
|
udc->driver = driver; |
|
udc->gadget.speed = USB_SPEED_FULL; |
|
|
|
udc->gadget.is_selfpowered = udc->is_selfpowered; |
|
udc->remote_wkp = 0; |
|
udc->softconnect = true; |
|
udc->todo |= UDC_START; |
|
spin_unlock_irqrestore(&udc->lock, flags); |
|
|
|
if (udc->thread_task) |
|
wake_up_process(udc->thread_task); |
|
|
|
return 0; |
|
} |
|
|
|
static int max3420_udc_stop(struct usb_gadget *gadget) |
|
{ |
|
struct max3420_udc *udc = to_udc(gadget); |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&udc->lock, flags); |
|
udc->is_selfpowered = udc->gadget.is_selfpowered; |
|
udc->gadget.speed = USB_SPEED_UNKNOWN; |
|
udc->driver = NULL; |
|
udc->softconnect = false; |
|
udc->todo |= UDC_START; |
|
spin_unlock_irqrestore(&udc->lock, flags); |
|
|
|
if (udc->thread_task) |
|
wake_up_process(udc->thread_task); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct usb_gadget_ops max3420_udc_ops = { |
|
.udc_start = max3420_udc_start, |
|
.udc_stop = max3420_udc_stop, |
|
.wakeup = max3420_wakeup, |
|
}; |
|
|
|
static void max3420_eps_init(struct max3420_udc *udc) |
|
{ |
|
int idx; |
|
|
|
INIT_LIST_HEAD(&udc->gadget.ep_list); |
|
|
|
for (idx = 0; idx < MAX3420_MAX_EPS; idx++) { |
|
struct max3420_ep *ep = &udc->ep[idx]; |
|
|
|
spin_lock_init(&ep->lock); |
|
INIT_LIST_HEAD(&ep->queue); |
|
|
|
ep->udc = udc; |
|
ep->id = idx; |
|
ep->halted = 0; |
|
ep->maxpacket = 0; |
|
ep->ep_usb.name = ep->name; |
|
ep->ep_usb.ops = &max3420_ep_ops; |
|
usb_ep_set_maxpacket_limit(&ep->ep_usb, MAX3420_EP_MAX_PACKET); |
|
|
|
if (idx == 0) { /* For EP0 */ |
|
ep->ep_usb.desc = &ep0_desc; |
|
ep->ep_usb.maxpacket = usb_endpoint_maxp(&ep0_desc); |
|
ep->ep_usb.caps.type_control = true; |
|
ep->ep_usb.caps.dir_in = true; |
|
ep->ep_usb.caps.dir_out = true; |
|
snprintf(ep->name, MAX3420_EPNAME_SIZE, "ep0"); |
|
continue; |
|
} |
|
|
|
if (idx == 1) { /* EP1 is OUT */ |
|
ep->ep_usb.caps.dir_in = false; |
|
ep->ep_usb.caps.dir_out = true; |
|
snprintf(ep->name, MAX3420_EPNAME_SIZE, "ep1-bulk-out"); |
|
} else { /* EP2 & EP3 are IN */ |
|
ep->ep_usb.caps.dir_in = true; |
|
ep->ep_usb.caps.dir_out = false; |
|
snprintf(ep->name, MAX3420_EPNAME_SIZE, |
|
"ep%d-bulk-in", idx); |
|
} |
|
ep->ep_usb.caps.type_iso = false; |
|
ep->ep_usb.caps.type_int = false; |
|
ep->ep_usb.caps.type_bulk = true; |
|
|
|
list_add_tail(&ep->ep_usb.ep_list, |
|
&udc->gadget.ep_list); |
|
} |
|
} |
|
|
|
static int max3420_probe(struct spi_device *spi) |
|
{ |
|
struct max3420_udc *udc; |
|
int err, irq; |
|
u8 reg[8]; |
|
|
|
if (spi->master->flags & SPI_MASTER_HALF_DUPLEX) { |
|
dev_err(&spi->dev, "UDC needs full duplex to work\n"); |
|
return -EINVAL; |
|
} |
|
|
|
spi->mode = SPI_MODE_3; |
|
spi->bits_per_word = 8; |
|
|
|
err = spi_setup(spi); |
|
if (err) { |
|
dev_err(&spi->dev, "Unable to setup SPI bus\n"); |
|
return -EFAULT; |
|
} |
|
|
|
udc = devm_kzalloc(&spi->dev, sizeof(*udc), GFP_KERNEL); |
|
if (!udc) |
|
return -ENOMEM; |
|
|
|
udc->spi = spi; |
|
|
|
udc->remote_wkp = 0; |
|
|
|
/* Setup gadget structure */ |
|
udc->gadget.ops = &max3420_udc_ops; |
|
udc->gadget.max_speed = USB_SPEED_FULL; |
|
udc->gadget.speed = USB_SPEED_UNKNOWN; |
|
udc->gadget.ep0 = &udc->ep[0].ep_usb; |
|
udc->gadget.name = driver_name; |
|
|
|
spin_lock_init(&udc->lock); |
|
mutex_init(&udc->spi_bus_mutex); |
|
|
|
udc->ep0req.ep = &udc->ep[0]; |
|
udc->ep0req.usb_req.buf = udc->ep0buf; |
|
INIT_LIST_HEAD(&udc->ep0req.queue); |
|
|
|
/* setup Endpoints */ |
|
max3420_eps_init(udc); |
|
|
|
/* configure SPI */ |
|
spi_rd_buf(udc, MAX3420_REG_EPIRQ, reg, 8); |
|
spi_wr8(udc, MAX3420_REG_PINCTL, FDUPSPI); |
|
|
|
err = usb_add_gadget_udc(&spi->dev, &udc->gadget); |
|
if (err) |
|
return err; |
|
|
|
udc->dev = &udc->gadget.dev; |
|
|
|
spi_set_drvdata(spi, udc); |
|
|
|
irq = of_irq_get_byname(spi->dev.of_node, "udc"); |
|
err = devm_request_irq(&spi->dev, irq, max3420_irq_handler, 0, |
|
"max3420", udc); |
|
if (err < 0) |
|
goto del_gadget; |
|
|
|
udc->thread_task = kthread_create(max3420_thread, udc, |
|
"max3420-thread"); |
|
if (IS_ERR(udc->thread_task)) { |
|
err = PTR_ERR(udc->thread_task); |
|
goto del_gadget; |
|
} |
|
|
|
irq = of_irq_get_byname(spi->dev.of_node, "vbus"); |
|
if (irq <= 0) { /* no vbus irq implies self-powered design */ |
|
udc->is_selfpowered = 1; |
|
udc->vbus_active = true; |
|
udc->todo |= UDC_START; |
|
usb_udc_vbus_handler(&udc->gadget, udc->vbus_active); |
|
usb_gadget_set_state(&udc->gadget, USB_STATE_POWERED); |
|
max3420_start(udc); |
|
} else { |
|
udc->is_selfpowered = 0; |
|
/* Detect current vbus status */ |
|
spi_rd_buf(udc, MAX3420_REG_EPIRQ, reg, 8); |
|
if (reg[7] != 0xff) |
|
udc->vbus_active = true; |
|
|
|
err = devm_request_irq(&spi->dev, irq, |
|
max3420_vbus_handler, 0, "vbus", udc); |
|
if (err < 0) |
|
goto del_gadget; |
|
} |
|
|
|
return 0; |
|
|
|
del_gadget: |
|
usb_del_gadget_udc(&udc->gadget); |
|
return err; |
|
} |
|
|
|
static int max3420_remove(struct spi_device *spi) |
|
{ |
|
struct max3420_udc *udc = spi_get_drvdata(spi); |
|
unsigned long flags; |
|
|
|
usb_del_gadget_udc(&udc->gadget); |
|
|
|
spin_lock_irqsave(&udc->lock, flags); |
|
|
|
kthread_stop(udc->thread_task); |
|
|
|
spin_unlock_irqrestore(&udc->lock, flags); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct of_device_id max3420_udc_of_match[] = { |
|
{ .compatible = "maxim,max3420-udc"}, |
|
{ .compatible = "maxim,max3421-udc"}, |
|
{}, |
|
}; |
|
MODULE_DEVICE_TABLE(of, max3420_udc_of_match); |
|
|
|
static struct spi_driver max3420_driver = { |
|
.driver = { |
|
.name = "max3420-udc", |
|
.of_match_table = of_match_ptr(max3420_udc_of_match), |
|
}, |
|
.probe = max3420_probe, |
|
.remove = max3420_remove, |
|
}; |
|
|
|
module_spi_driver(max3420_driver); |
|
|
|
MODULE_DESCRIPTION(DRIVER_DESC); |
|
MODULE_AUTHOR("Jassi Brar <[email protected]>"); |
|
MODULE_LICENSE("GPL");
|
|
|