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stm32: Add support for USB on stm32g0 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2021-12-19 12:02:35 -05:00
parent 8d7a6e4ca4
commit 9549a3b4fb
2 changed files with 70 additions and 21 deletions
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2
src/stm32/Kconfig
View File

@ -93,7 +93,7 @@ config MACH_STM32F4x5 # F405, F407, F429 series
bool
config HAVE_STM32_USBFS
bool
default y if MACH_STM32F103 || MACH_STM32F0x2 || MACH_STM32F070
default y if MACH_STM32F103 || MACH_STM32F0x2 || MACH_STM32F070 || MACH_STM32G0
config HAVE_STM32_USBOTG
bool
default y if MACH_STM32F2 || MACH_STM32F4 || MACH_STM32H7

89
src/stm32/usbfs.c
View File

@ -1,4 +1,4 @@
// Hardware interface to "fullspeed USB controller" on stm32f1
// Hardware interface to "fullspeed USB controller"
//
// Copyright (C) 2018-2021 Kevin O'Connor <kevin@koconnor.net>
//
@ -18,11 +18,29 @@
#if CONFIG_MACH_STM32F103
// Transfer memory is accessed with 32bits, but contains only 16bits of data
typedef volatile uint32_t epmword_t;
#define WSIZE 2
#define USBx_IRQn USB_LP_IRQn
#elif CONFIG_MACH_STM32F0
// Transfer memory is accessed with 16bits and contains 16bits of data
typedef volatile uint16_t epmword_t;
#define WSIZE 2
#define USBx_IRQn USB_IRQn
#elif CONFIG_MACH_STM32G0
// Transfer memory is accessed with 32bits and contains 32bits of data
typedef volatile uint32_t epmword_t;
#define WSIZE 4
#define USBx_IRQn USB_UCPD1_2_IRQn
// The stm32g0 has slightly different register names
#define USB USB_DRD_FS
#define USB_PMAADDR USB_DRD_PMAADDR
#define USB_EPADDR_FIELD USB_CHEP_ADDR
#define USB_EP_CTR_RX USB_EP_VTRX
#define USB_EP_CTR_TX USB_EP_VTTX
#define USB_EPRX_STAT USB_EP_RX_STRX
#define USB_EPTX_STAT USB_EP_TX_STTX
#define USB_ISTR_EP_ID USB_ISTR_IDN
#define USB_CNTR_FRES USB_CNTR_USBRST
#endif
@ -32,9 +50,9 @@
// Layout of the USB transfer memory
#define EPM ((epmword_t*)USB_PMAADDR)
#define EPM_EP_DESC(ep) (&EPM[(ep) * 4])
#define EPM_EP_DESC(ep) (&EPM[(ep) * (8 / WSIZE)])
#define EPM_BUF_OFFSET 0x10
#define EPM_EP_BUF_SIZE (64 / 2 + 1)
#define EPM_EP_BUF_SIZE (64 / WSIZE + 1)
#define EPM_EP_TX_BUF(ep) (&EPM[EPM_BUF_OFFSET + (ep)*2*EPM_EP_BUF_SIZE])
#define EPM_EP_RX_BUF(ep) (&EPM[EPM_BUF_OFFSET + (1+(ep)*2)*EPM_EP_BUF_SIZE])
@ -42,15 +60,20 @@
static void
epm_ep_desc_setup(int ep, int rx_size)
{
uint32_t addr_tx = (EPM_EP_TX_BUF(ep) - EPM) * 2, count_tx = 0;
uint32_t addr_rx = (EPM_EP_RX_BUF(ep) - EPM) * 2;
uint32_t addr_tx = (EPM_EP_TX_BUF(ep) - EPM) * WSIZE, count_tx = 0;
uint32_t addr_rx = (EPM_EP_RX_BUF(ep) - EPM) * WSIZE;
uint32_t count_rx = (rx_size <= 30 ? DIV_ROUND_UP(rx_size, 2) << 10
: ((DIV_ROUND_UP(rx_size, 32) - 1) << 10) | 0x8000);
epmword_t *desc = EPM_EP_DESC(ep);
desc[0] = addr_tx;
desc[1] = count_tx;
desc[2] = addr_rx;
desc[3] = count_rx;
if (WSIZE == 2) {
desc[0] = addr_tx;
desc[1] = count_tx;
desc[2] = addr_rx;
desc[3] = count_rx;
} else {
desc[0] = addr_tx | (count_tx << 16);
desc[1] = addr_rx | (count_rx << 16);
}
}
// Return number of read bytes on an rx endpoint
@ -58,7 +81,9 @@ static uint32_t
epm_get_ep_count_rx(int ep)
{
epmword_t *desc = EPM_EP_DESC(ep);
return desc[3] & 0x3ff;
if (WSIZE == 2)
return desc[3] & 0x3ff;
return (desc[1] >> 16) & 0x3ff;
}
// Set number of bytes ready to be transmitted on a tx endpoint
@ -66,7 +91,12 @@ static void
epm_set_ep_count_tx(int ep, uint32_t count)
{
epmword_t *desc = EPM_EP_DESC(ep);
desc[1] = count;
if (WSIZE == 2) {
desc[1] = count;
} else {
uint32_t addr_tx = (EPM_EP_TX_BUF(ep) - EPM) * WSIZE;
desc[0] = addr_tx | (count << 16);
}
}
// Setup the transfer descriptors in dedicated usb memory
@ -88,13 +118,23 @@ btable_read_packet(int ep, uint8_t *dest, int max_len)
if (count > max_len)
count = max_len;
int i;
for (i=0; i<(count/2); i++) {
for (i=0; i<count/WSIZE; i++) {
uint32_t d = *src++;
*dest++ = d;
*dest++ = d >> 8;
if (WSIZE == 4) {
*dest++ = d >> 16;
*dest++ = d >> 24;
}
}
if (count & (WSIZE-1)) {
uint32_t d = *src;
*dest++ = d;
if ((count & (WSIZE-1)) > 1)
*dest++ = d >> 8;
if ((count & (WSIZE-1)) > 2)
*dest++ = d >> 16;
}
if (count & 1)
*dest = *src;
return count;
}
@ -104,12 +144,22 @@ btable_write_packet(int ep, const uint8_t *src, int count)
{
epmword_t *dest = EPM_EP_TX_BUF(ep);
int i;
for (i=0; i<(count/2); i++) {
uint8_t b1 = *src++, b2 = *src++;
*dest++ = b1 | (b2 << 8);
for (i=0; i<count/WSIZE; i++) {
uint8_t b1 = *src++, b2 = *src++, b3 = 0, b4 = 0;
if (WSIZE == 4) {
b3 = *src++;
b4 = *src++;
}
*dest++ = b1 | (b2 << 8) | (b3 << 16) | (b4 << 24);
}
if (count & (WSIZE-1)) {
uint32_t d = *src++;
if ((count & (WSIZE-1)) > 1)
d |= *src++ << 8;
if ((count & (WSIZE-1)) > 2)
d |= *src++ << 16;
*dest = d;
}
if (count & 1)
*dest = *src;
epm_set_ep_count_tx(ep, count);
}
@ -302,7 +352,6 @@ usb_init(void)
// Reset usb controller and enable interrupts
USB->CNTR = USB_CNTR_FRES;
USB->BTABLE = 0;
USB->DADDR = 0;
USB->CNTR = USB_CNTR_RESETM;
USB->ISTR = 0;