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// Hardware interface to USB on samd
//
// Copyright (C) 2018-2019 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include <string.h> // memcpy
#include "autoconf.h" // CONFIG_FLASH_START
#include "board/io.h" // readl
#include "board/irq.h" // irq_disable
#include "board/usb_cdc.h" // usb_notify_ep0
#include "board/usb_cdc_ep.h" // USB_CDC_EP_BULK_IN
#include "command.h" // DECL_CONSTANT_STR
#include "internal.h" // enable_pclock
#include "sched.h" // DECL_INIT
/****************************************************************
* USB transfer memory
****************************************************************/
static uint8_t __aligned(4) ep0out[USB_CDC_EP0_SIZE];
static uint8_t __aligned(4) ep0in[USB_CDC_EP0_SIZE];
static uint8_t __aligned(4) acmin[USB_CDC_EP_ACM_SIZE];
static uint8_t __aligned(4) bulkout[USB_CDC_EP_BULK_OUT_SIZE];
static uint8_t __aligned(4) bulkin[USB_CDC_EP_BULK_IN_SIZE];
static UsbDeviceDescriptor usb_desc[USB_CDC_EP_BULK_IN + 1] = {
[0] = { {
{
.ADDR.reg = (uint32_t)ep0out,
.PCKSIZE.reg = USB_DEVICE_PCKSIZE_SIZE(sizeof(ep0out) >> 4),
}, {
.ADDR.reg = (uint32_t)ep0in,
.PCKSIZE.reg = USB_DEVICE_PCKSIZE_SIZE(sizeof(ep0in) >> 4),
},
} },
[USB_CDC_EP_ACM] = { {
{
}, {
.ADDR.reg = (uint32_t)acmin,
.PCKSIZE.reg = USB_DEVICE_PCKSIZE_SIZE(sizeof(acmin) >> 4),
},
} },
[USB_CDC_EP_BULK_OUT] = { {
{
.ADDR.reg = (uint32_t)bulkout,
.PCKSIZE.reg = USB_DEVICE_PCKSIZE_SIZE(sizeof(bulkout) >> 4),
}, {
},
} },
[USB_CDC_EP_BULK_IN] = { {
{
}, {
.ADDR.reg = (uint32_t)bulkin,
.PCKSIZE.reg = USB_DEVICE_PCKSIZE_SIZE(sizeof(bulkin) >> 4),
},
} },
};
#define EP0 USB->DEVICE.DeviceEndpoint[0]
#define EP_ACM USB->DEVICE.DeviceEndpoint[USB_CDC_EP_ACM]
#define EP_BULKOUT USB->DEVICE.DeviceEndpoint[USB_CDC_EP_BULK_OUT]
#define EP_BULKIN USB->DEVICE.DeviceEndpoint[USB_CDC_EP_BULK_IN]
static int_fast8_t
usb_write_packet(uint32_t ep, uint32_t bank, const void *data, uint_fast8_t len)
{
// Check if there is room for this packet
UsbDeviceEndpoint *ude = &USB->DEVICE.DeviceEndpoint[ep];
uint8_t sts = ude->EPSTATUS.reg;
uint8_t bkrdy = (bank ? USB_DEVICE_EPSTATUS_BK1RDY
: USB_DEVICE_EPSTATUS_BK0RDY);
if (sts & bkrdy)
return -1;
// Copy the packet to the given buffer
UsbDeviceDescBank *uddb = &usb_desc[ep].DeviceDescBank[bank];
memcpy((void*)uddb->ADDR.reg, data, len);
// Inform the USB hardware of the available packet
uint32_t pcksize = uddb->PCKSIZE.reg;
uint32_t c = pcksize & ~USB_DEVICE_PCKSIZE_BYTE_COUNT_Msk;
uddb->PCKSIZE.reg = c | USB_DEVICE_PCKSIZE_BYTE_COUNT(len);
ude->EPSTATUSSET.reg = bkrdy;
return len;
}
static int_fast8_t
usb_read_packet(uint32_t ep, uint32_t bank, void *data, uint_fast8_t max_len)
{
// Check if there is a packet ready
UsbDeviceEndpoint *ude = &USB->DEVICE.DeviceEndpoint[ep];
uint8_t sts = ude->EPSTATUS.reg;
uint8_t bkrdy = (bank ? USB_DEVICE_EPSTATUS_BK1RDY
: USB_DEVICE_EPSTATUS_BK0RDY);
if (!(sts & bkrdy))
return -1;
// Copy the packet to the given buffer
UsbDeviceDescBank *uddb = &usb_desc[ep].DeviceDescBank[bank];
uint32_t pcksize = uddb->PCKSIZE.reg;
uint32_t c = pcksize & USB_DEVICE_PCKSIZE_BYTE_COUNT_Msk;
if (c > max_len)
c = max_len;
memcpy(data, (void*)uddb->ADDR.reg, c);
// Notify the USB hardware that the space is now available
ude->EPSTATUSCLR.reg = bkrdy;
return c;
}
/****************************************************************
* Interface
****************************************************************/
int_fast8_t
usb_read_bulk_out(void *data, uint_fast8_t max_len)
{
return usb_read_packet(USB_CDC_EP_BULK_OUT, 0, data, max_len);
}
int_fast8_t
usb_send_bulk_in(void *data, uint_fast8_t len)
{
return usb_write_packet(USB_CDC_EP_BULK_IN, 1, data, len);
}
int_fast8_t
usb_read_ep0(void *data, uint_fast8_t max_len)
{
return usb_read_packet(0, 0, data, max_len);
}
int_fast8_t
usb_read_ep0_setup(void *data, uint_fast8_t max_len)
{
return usb_read_ep0(data, max_len);
}
int_fast8_t
usb_send_ep0(const void *data, uint_fast8_t len)
{
return usb_write_packet(0, 1, data, len);
}
void
usb_stall_ep0(void)
{
EP0.EPSTATUSSET.reg = USB_DEVICE_EPSTATUS_STALLRQ(3);
}
static uint8_t set_address;
void
usb_set_address(uint_fast8_t addr)
{
writeb(&set_address, addr | USB_DEVICE_DADD_ADDEN);
usb_send_ep0(NULL, 0);
}
void
usb_set_configure(void)
{
EP_ACM.EPCFG.reg = USB_DEVICE_EPCFG_EPTYPE1(4);
EP_BULKOUT.EPCFG.reg = USB_DEVICE_EPCFG_EPTYPE0(3);
EP_BULKOUT.EPINTENSET.reg = (
USB_DEVICE_EPINTENSET_TRCPT0 | USB_DEVICE_EPINTENSET_TRCPT1);
EP_BULKIN.EPCFG.reg = USB_DEVICE_EPCFG_EPTYPE1(3);
EP_BULKIN.EPINTENSET.reg = (
USB_DEVICE_EPINTENSET_TRCPT0 | USB_DEVICE_EPINTENSET_TRCPT1);
}
void
usb_request_bootloader(void)
{
if (!CONFIG_FLASH_START)
return;
// Bootloader hack
irq_disable();
#if CONFIG_MACH_SAMD21
writel((void*)0x20007FFC, 0x07738135);
#elif CONFIG_MACH_SAMD51
writel((void*)(HSRAM_ADDR + HSRAM_SIZE - 4), 0xf01669ef);
#endif
NVIC_SystemReset();
}
/****************************************************************
* Setup and interrupts
****************************************************************/
void __visible
USB_Handler(void)
{
uint8_t s = USB->DEVICE.INTFLAG.reg;
if (s & USB_DEVICE_INTFLAG_EORST) {
USB->DEVICE.INTFLAG.reg = USB_DEVICE_INTFLAG_EORST;
// Enable endpoint 0 irqs
EP0.EPINTENSET.reg = (
USB_DEVICE_EPINTENSET_TRCPT0 | USB_DEVICE_EPINTENSET_TRCPT1
| USB_DEVICE_EPINTENSET_RXSTP);
}
uint16_t ep = USB->DEVICE.EPINTSMRY.reg;
if (ep & (1<<0)) {
uint8_t sts = EP0.EPINTFLAG.reg;
EP0.EPINTFLAG.reg = sts;
if (set_address && sts & USB_DEVICE_EPINTFLAG_TRCPT1) {
// Apply address after last "in" message transmitted
USB->DEVICE.DADD.reg = set_address;
set_address = 0;
}
usb_notify_ep0();
}
if (ep & (1<<USB_CDC_EP_BULK_OUT)) {
uint8_t sts = EP_BULKOUT.EPINTFLAG.reg;
EP_BULKOUT.EPINTFLAG.reg = sts;
usb_notify_bulk_out();
}
if (ep & (1<<USB_CDC_EP_BULK_IN)) {
uint8_t sts = EP_BULKIN.EPINTFLAG.reg;
EP_BULKIN.EPINTFLAG.reg = sts;
usb_notify_bulk_in();
}
}
// Aliases for irq handeler on SAMD51
void USB_0_Handler(void) __visible __attribute__((alias("USB_Handler")));
void USB_1_Handler(void) __visible __attribute__((alias("USB_Handler")));
void USB_2_Handler(void) __visible __attribute__((alias("USB_Handler")));
void USB_3_Handler(void) __visible __attribute__((alias("USB_Handler")));
DECL_CONSTANT_STR("RESERVE_PINS_USB", "PA24,PA25");
void
usbserial_init(void)
{
// configure usb clock
enable_pclock(USB_GCLK_ID, ID_USB);
// configure USBD+ and USBD- pins
uint32_t ptype = CONFIG_MACH_SAMD21 ? 'G' : 'H';
gpio_peripheral(GPIO('A', 24), ptype, 0);
gpio_peripheral(GPIO('A', 25), ptype, 0);
uint32_t trim = GET_FUSE(USB_FUSES_TRIM);
uint32_t transp = GET_FUSE(USB_FUSES_TRANSP);
uint32_t transn = GET_FUSE(USB_FUSES_TRANSN);
USB->DEVICE.PADCAL.reg = (USB_PADCAL_TRIM(trim) | USB_PADCAL_TRANSP(transp)
| USB_PADCAL_TRANSN(transn));
// Enable USB in device mode
USB->DEVICE.CTRLA.reg = USB_CTRLA_ENABLE;
USB->DEVICE.DESCADD.reg = (uint32_t)usb_desc;
EP0.EPCFG.reg = USB_DEVICE_EPCFG_EPTYPE0(1) | USB_DEVICE_EPCFG_EPTYPE1(1);
EP_ACM.EPCFG.reg = USB_DEVICE_EPCFG_EPTYPE1(4);
USB->DEVICE.CTRLB.reg = 0;
// enable irqs
USB->DEVICE.INTENSET.reg = USB_DEVICE_INTENSET_EORST;
#if CONFIG_MACH_SAMD21
NVIC_SetPriority(USB_IRQn, 1);
NVIC_EnableIRQ(USB_IRQn);
#elif CONFIG_MACH_SAMD51
NVIC_SetPriority(USB_0_IRQn, 1);
NVIC_SetPriority(USB_1_IRQn, 1);
NVIC_SetPriority(USB_2_IRQn, 1);
NVIC_SetPriority(USB_3_IRQn, 1);
NVIC_EnableIRQ(USB_0_IRQn);
NVIC_EnableIRQ(USB_1_IRQn);
NVIC_EnableIRQ(USB_2_IRQn);
NVIC_EnableIRQ(USB_3_IRQn);
#endif
}
DECL_INIT(usbserial_init);
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