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atusb/fw3: split USB driver into chip-specifc and general part

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- usb/usb.c: moved chip-specific functions to usb/atu2.c
- Makefile (USB_OBJS): added usb/atu2.c
- usb/usb.h, usb/usb.c, ep0.c: made argument to my_setup and user_setup
  "const"
- usb/ubs.h (handle_setup): call from chip driver to generic stack
- usb/ubs.h (set_addr): call from generic stack to chip driver
This commit is contained in:
Werner Almesberger 2011-02-14 12:01:11 -03:00
parent 908e04c309
commit 983d330294
5 changed files with 239 additions and 187 deletions
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2
atusb/fw3/Makefile
View File

@ -24,7 +24,7 @@ CC = $(AVR_PREFIX)gcc
OBJCOPY = $(AVR_PREFIX)objcopy
#OBJDUMP = $(AVR_PREFIX)objdump
USB_OBJS = usb.o
USB_OBJS = usb.o atu2.o
OBJS = atusb.o board.o spi.o descr.o ep0.o $(USB_OBJS)
vpath %.c usb/

2
atusb/fw3/ep0.c
View File

@ -57,7 +57,7 @@ static void do_buf_write(void *user)
#define BUILD_OFFSET 7 /* '#' plus "65535" plus ' ' */
static int my_setup(struct setup_request *setup)
static int my_setup(const struct setup_request *setup)
{
unsigned tmp;
uint8_t i;

223
atusb/fw3/usb/atu2.c Normal file
View File

@ -0,0 +1,223 @@
/*
* u/atu2.c - Chip-specific driver for Atmel ATxxxU2 USB chips
*
* Written 2008-2011 by Werner Almesberger
* Copyright 2008-2011 Werner Almesberger
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
/*
* Known issues:
* - no suspend/resume
* - EP0-sized packets cause an (otherwise harmless) SUEND at the end of the
* packet
* - #ifdef hell
*/
/*
* This code follows the register read/write sequences from the examples in
* SiLabs/MCU/Examples/C8051F326_7/USB_Interrupt/Firmware/F326_USB_Main.c and
* SiLabs/MCU/Examples/C8051F326_7/USB_Interrupt/Firmware/F326_USB_ISR.c
*
* More resources:
* http://www.beyondlogic.org/usbnutshell/usb1.htm
*/
#include <stdint.h>
#define F_CPU 8000000UL
#include <util/delay.h>
#include <avr/io.h>
#include "usb.h"
#include "../board.h"
#ifndef NULL
#define NULL 0
#endif
#if 1
#define BUG_ON(cond) do { if (cond) panic(); } while (0)
#else
#define BUG_ON(cond)
#endif
#define NUM_EPS 1
struct ep_descr eps[NUM_EPS];
static uint16_t usb_read_word(void)
{
uint8_t low;
low = UEDATX;
return low | UEDATX << 8;
}
static void enable_addr(void *user)
{
while (!(UEINTX & (1 << TXINI)));
UDADDR |= 1 << ADDEN;
}
int set_addr(uint8_t addr)
{
UDADDR = addr;
usb_send(&eps[0], NULL, 0, enable_addr, NULL);
return 1;
}
static int ep_setup(void)
{
struct setup_request setup;
BUG_ON(UEBCLX < 8);
setup.bmRequestType = UEDATX;
setup.bRequest = UEDATX;
setup.wValue = usb_read_word();
setup.wIndex = usb_read_word();
setup.wLength = usb_read_word();
if (!handle_setup(&setup))
return 0;
if (!(setup.bmRequestType & 0x80) && eps[0].state == EP_IDLE)
usb_send(&eps[0], NULL, 0, NULL, NULL);
return 1;
}
static int ep_rx(struct ep_descr *ep)
{
uint8_t size;
size = UEBCLX;
if (size > ep->end-ep->buf)
return 0;
while (size--)
*ep->buf++ = UEDATX;
if (ep->buf == ep->end) {
ep->state = EP_IDLE;
if (ep->callback)
ep->callback(ep->user);
if (ep == &eps[0])
usb_send(ep, NULL, 0, NULL, NULL);
}
return 1;
}
static void ep_tx(struct ep_descr *ep)
{
uint8_t size = ep->end-ep->buf;
uint8_t left;
if (size > ep->size)
size = ep->size;
for (left = size; left; left--)
UEDATX = *ep->buf++;
if (size == ep->size)
return;
ep->state = EP_IDLE;
}
static void handle_ep(int n)
{
struct ep_descr *ep = eps+n;
UENUM = n;
if (UEINTX & (1 << RXSTPI)) {
/* @@@ EP_RX. EP_TX: cancel */
if (!ep_setup())
goto stall;
UEINTX &= ~(1 << RXSTPI);
}
if (UEINTX & (1 << RXOUTI)) {
/* @@ EP_TX: cancel */
if (ep->state != EP_RX)
goto stall;
if (!ep_rx(ep))
goto stall;
// UEINTX &= ~(1 << RXOUTI);
UEINTX &= ~(1 << RXOUTI | 1 << FIFOCON);
}
if (UEINTX & (1 << STALLEDI)) {
ep->state = EP_IDLE;
UEINTX &= ~(1 << STALLEDI);
}
if (UEINTX & (1 << TXINI)) {
/* @@ EP_RX: cancel */
if (ep->state == EP_TX) {
ep_tx(ep);
UEINTX &= ~(1 << TXINI);
if (ep->state == EP_IDLE && ep->callback)
ep->callback(ep->user);
}
}
return;
stall:
UEINTX &= ~(1 << RXSTPI | 1 << RXOUTI | 1 << STALLEDI);
ep->state = EP_IDLE;
UECONX |= 1 << STALLRQ;
}
void usb_poll(void)
{
uint8_t flags, i;
flags = UEINT;
for (i = 0; i != NUM_EPS; i++)
if (1 || flags & (1 << i))
handle_ep(i);
/* @@@ USB bus reset */
}
static void ep_init(void)
{
UENUM = 0;
UECONX = (1 << RSTDT) | (1 << EPEN); /* enable */
UECFG0X = 0; /* control, direction is ignored */
UECFG1X = 3 << EPSIZE0; /* 64 bytes */
UECFG1X |= 1 << ALLOC;
while (!(UESTA0X & (1 << CFGOK)));
eps[0].state = EP_IDLE;
eps[0].size = 64;
}
void usb_init(void)
{
USBCON |= 1 << FRZCLK; /* freeze the clock */
/* enable the PLL and wait for it to lock */
PLLCSR &= ~(1 << PLLP2 | 1 << PLLP1 | 1 << PLLP0);
PLLCSR |= 1 << PLLE;
while (!(PLLCSR & (1 << PLOCK)));
USBCON &= ~(1 << USBE); /* reset the controller */
USBCON |= 1 << USBE;
USBCON &= ~(1 << FRZCLK); /* thaw the clock */
UDCON &= ~(1 << DETACH); /* attach the pull-up */
UDCON |= 1 << RSTCPU; /* reset CPU on bus reset */
ep_init();
}

194
atusb/fw3/usb/usb.c
View File

@ -29,10 +29,6 @@
#include <stdint.h>
#define F_CPU 8000000UL
#include <util/delay.h>
#include <avr/io.h>
#include "usb.h"
#include "../board.h"
@ -50,17 +46,12 @@ extern void panic(void);
#define BUG_ON(cond)
#endif
struct ep_descr eps[5];
int (*user_setup)(struct setup_request *setup);
int (*user_setup)(const struct setup_request *setup);
int (*user_get_descriptor)(uint8_t type, uint8_t index,
const uint8_t * const *reply, uint8_t *size);
void (*user_reset)(void);
static uint8_t addr;
void usb_io(struct ep_descr *ep, enum ep_state state, uint8_t *buf,
uint8_t size, void (*callback)(void *user), void *user)
{
@ -73,15 +64,6 @@ void usb_io(struct ep_descr *ep, enum ep_state state, uint8_t *buf,
}
static uint16_t usb_read_word(void)
{
uint8_t low;
low = UEDATX;
return low | UEDATX << 8;
}
static int get_descriptor(uint8_t type, uint8_t index, uint16_t length)
{
const uint8_t *reply;
@ -111,33 +93,9 @@ static int get_descriptor(uint8_t type, uint8_t index, uint16_t length)
}
static void enable_addr(void *user)
int handle_setup(const struct setup_request *setup)
{
while (!(UEINTX & (1 << TXINI)));
UDADDR = addr | 1 << ADDEN;
}
/*
* Process a SETUP packet. Hardware ensures that length is 8 bytes.
*/
static int handle_setup(void)
{
struct setup_request setup;
BUG_ON(UEBCLX < 8);
setup.bmRequestType = UEDATX;
setup.bRequest = UEDATX;
setup.wValue = usb_read_word();
setup.wIndex = usb_read_word();
setup.wLength = usb_read_word();
// UEINTX &= ~(1 << RXSTPI);
switch (setup.bmRequestType | setup.bRequest << 8) {
switch (setup->bmRequestType | setup->bRequest << 8) {
/*
* Device request
@ -146,7 +104,7 @@ static int handle_setup(void)
*/
case FROM_DEVICE(GET_STATUS):
if (setup.wLength != 2)
if (setup->wLength != 2)
return 0;
usb_send(&eps[0], "\000", 2, NULL, NULL);
break;
@ -155,13 +113,11 @@ static int handle_setup(void)
case TO_DEVICE(SET_FEATURE):
return 0;
case TO_DEVICE(SET_ADDRESS):
addr = setup.wValue;
UDADDR = addr;
usb_send(&eps[0], NULL, 0, enable_addr, NULL);
set_addr(setup->wValue);
break;
case FROM_DEVICE(GET_DESCRIPTOR):
if (!get_descriptor(setup.wValue >> 8, setup.wValue,
setup.wLength))
if (!get_descriptor(setup->wValue >> 8, setup->wValue,
setup->wLength))
return 0;
break;
case TO_DEVICE(SET_DESCRIPTOR):
@ -170,7 +126,7 @@ static int handle_setup(void)
usb_send(&eps[0], "", 1, NULL, NULL);
break;
case TO_DEVICE(SET_CONFIGURATION):
if (setup.wValue != config_descriptor[5])
if (setup->wValue != config_descriptor[5])
return 0;
break;
@ -191,8 +147,8 @@ static int handle_setup(void)
const uint8_t *interface_descriptor =
config_descriptor+9;
if (setup.wIndex != interface_descriptor[2] ||
setup.wValue != interface_descriptor[3])
if (setup->wIndex != interface_descriptor[2] ||
setup->wValue != interface_descriptor[3])
return 0;
}
break;
@ -213,136 +169,8 @@ static int handle_setup(void)
default:
if (!user_setup)
return 0;
if (!user_setup(&setup))
return 0;
return user_setup(setup);
}
if (!(setup.bmRequestType & 0x80) && eps[0].state == EP_IDLE)
usb_send(&eps[0], NULL, 0, NULL, NULL);
return 1;
}
static int ep_rx(struct ep_descr *ep)
{
uint8_t size;
size = UEBCLX;
if (size > ep->end-ep->buf)
return 0;
while (size--)
*ep->buf++ = UEDATX;
if (ep->buf == ep->end) {
ep->state = EP_IDLE;
if (ep->callback)
ep->callback(ep->user);
if (ep == &eps[0])
usb_send(ep, NULL, 0, NULL, NULL);
}
return 1;
}
static void ep_tx(struct ep_descr *ep)
{
uint8_t size = ep->end-ep->buf;
uint8_t left;
if (size > ep->size)
size = ep->size;
for (left = size; left; left--)
UEDATX = *ep->buf++;
if (size == ep->size)
return;
ep->state = EP_IDLE;
}
static void handle_ep(int n)
{
struct ep_descr *ep = eps+n;
UENUM = n;
if (UEINTX & (1 << RXSTPI)) {
/* @@@ EP_RX. EP_TX: cancel */
if (!handle_setup())
goto stall;
UEINTX &= ~(1 << RXSTPI);
}
if (UEINTX & (1 << RXOUTI)) {
/* @@ EP_TX: cancel */
if (ep->state != EP_RX)
goto stall;
if (!ep_rx(ep))
goto stall;
// UEINTX &= ~(1 << RXOUTI);
UEINTX &= ~(1 << RXOUTI | 1 << FIFOCON);
}
if (UEINTX & (1 << STALLEDI)) {
ep->state = EP_IDLE;
UEINTX &= ~(1 << STALLEDI);
}
if (UEINTX & (1 << TXINI)) {
/* @@ EP_RX: cancel */
if (ep->state == EP_TX) {
ep_tx(ep);
UEINTX &= ~(1 << TXINI);
if (ep->state == EP_IDLE && ep->callback)
ep->callback(ep->user);
}
}
return;
stall:
UEINTX &= ~(1 << RXSTPI | 1 << RXOUTI | 1 << STALLEDI);
ep->state = EP_IDLE;
UECONX |= 1 << STALLRQ;
}
void usb_poll(void)
{
uint8_t flags, i;
flags = UEINT;
for (i = 0; i != NUM_EPS; i++)
if (1 || flags & (1 << i))
handle_ep(i);
/* @@@ USB bus reset */
}
static void ep_init(void)
{
UENUM = 0;
UECONX = (1 << RSTDT) | (1 << EPEN); /* enable */
UECFG0X = 0; /* control, direction is ignored */
UECFG1X = 3 << EPSIZE0; /* 64 bytes */
UECFG1X |= 1 << ALLOC;
while (!(UESTA0X & (1 << CFGOK)));
eps[0].state = EP_IDLE;
eps[0].size = 64;
}
void usb_init(void)
{
USBCON |= 1 << FRZCLK; /* freeze the clock */
/* enable the PLL and wait for it to lock */
PLLCSR &= ~(1 << PLLP2 | 1 << PLLP1 | 1 << PLLP0);
PLLCSR |= 1 << PLLE;
while (!(PLLCSR & (1 << PLOCK)));
USBCON &= ~(1 << USBE); /* reset the controller */
USBCON |= 1 << USBE;
USBCON &= ~(1 << FRZCLK); /* thaw the clock */
UDCON &= ~(1 << DETACH); /* attach the pull-up */
UDCON |= 1 << RSTCPU; /* reset CPU on bus reset */
ep_init();
}

5
atusb/fw3/usb/usb.h
View File

@ -124,7 +124,7 @@ extern const uint8_t device_descriptor[];
extern const uint8_t config_descriptor[];
extern struct ep_descr eps[];
extern int (*user_setup)(struct setup_request *setup);
extern int (*user_setup)(const struct setup_request *setup);
extern int (*user_get_descriptor)(uint8_t type, uint8_t index,
const uint8_t * const *reply, uint8_t *size);
extern void (*user_reset)(void);
@ -139,7 +139,8 @@ extern void (*user_reset)(void);
void usb_io(struct ep_descr *ep, enum ep_state state, uint8_t *buf,
uint8_t size, void (*callback)(void *user), void *user);
int handle_setup(const struct setup_request *setup);
int set_addr(uint8_t addr);
void usb_init(void);
void usb_poll(void);