254 lines
7.2 KiB
C
254 lines
7.2 KiB
C
#include <irq.h>
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#include <riscv.h>
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#include <string.h>
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#include <usb.h>
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#ifdef CSR_USB_EP_0_OUT_EV_PENDING_ADDR
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#define EP0OUT_BUFFERS 4
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__attribute__((aligned(4)))
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static uint8_t volatile usb_ep0out_buffer_len[EP0OUT_BUFFERS];
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static uint8_t volatile usb_ep0out_buffer[EP0OUT_BUFFERS][256];
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static uint8_t volatile usb_ep0out_last_tok[EP0OUT_BUFFERS];
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static volatile uint8_t usb_ep0out_wr_ptr;
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static volatile uint8_t usb_ep0out_rd_ptr;
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static const int max_byte_length = 64;
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static const uint8_t * volatile current_data;
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static volatile int current_length;
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static volatile int data_offset;
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static volatile int data_to_send;
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static int next_packet_is_empty;
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// Note that our PIDs are only bits 2 and 3 of the token,
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// since all other bits are effectively redundant at this point.
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enum USB_PID {
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USB_PID_OUT = 0,
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USB_PID_SOF = 1,
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USB_PID_IN = 2,
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USB_PID_SETUP = 3,
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};
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enum epfifo_response {
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EPF_ACK = 0,
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EPF_NAK = 1,
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EPF_NONE = 2,
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EPF_STALL = 3,
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};
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#define USB_EV_ERROR 1
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#define USB_EV_PACKET 2
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void usb_idle(void) {
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usb_ep_0_out_ev_enable_write(0);
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usb_ep_0_in_ev_enable_write(0);
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// Reject all incoming data, since there is no handler anymore
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usb_ep_0_out_respond_write(EPF_NAK);
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// Reject outgoing data, since we don't have any to give.
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usb_ep_0_in_respond_write(EPF_NAK);
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irq_setmask(irq_getmask() & ~(1 << USB_INTERRUPT));
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}
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void usb_disconnect(void) {
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usb_ep_0_out_ev_enable_write(0);
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usb_ep_0_in_ev_enable_write(0);
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irq_setmask(irq_getmask() & ~(1 << USB_INTERRUPT));
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usb_pullup_out_write(0);
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}
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void usb_connect(void) {
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usb_ep_0_out_ev_pending_write(usb_ep_0_out_ev_enable_read());
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usb_ep_0_in_ev_pending_write(usb_ep_0_in_ev_pending_read());
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usb_ep_0_out_ev_enable_write(USB_EV_PACKET | USB_EV_ERROR);
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usb_ep_0_in_ev_enable_write(USB_EV_PACKET | USB_EV_ERROR);
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// Accept incoming data by default.
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usb_ep_0_out_respond_write(EPF_ACK);
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// Reject outgoing data, since we have none to give yet.
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usb_ep_0_in_respond_write(EPF_NAK);
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usb_pullup_out_write(1);
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irq_setmask(irq_getmask() | (1 << USB_INTERRUPT));
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}
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void usb_init(void) {
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usb_ep0out_wr_ptr = 0;
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usb_ep0out_rd_ptr = 0;
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usb_pullup_out_write(0);
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return;
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}
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static void process_tx(void) {
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// Don't allow requeueing -- only queue more data if we're
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// currently set up to respond NAK.
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if (usb_ep_0_in_respond_read() != EPF_NAK) {
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return;
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}
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// Prevent us from double-filling the buffer.
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if (!usb_ep_0_in_ibuf_empty_read()) {
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return;
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}
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if (!current_data || !current_length) {
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return;
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}
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data_offset += data_to_send;
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data_to_send = current_length - data_offset;
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// Clamp the data to the maximum packet length
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if (data_to_send > max_byte_length) {
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data_to_send = max_byte_length;
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next_packet_is_empty = 0;
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}
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else if (data_to_send == max_byte_length) {
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next_packet_is_empty = 1;
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}
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else if (next_packet_is_empty) {
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next_packet_is_empty = 0;
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data_to_send = 0;
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}
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else if (current_data == NULL || data_to_send <= 0) {
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next_packet_is_empty = 0;
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current_data = NULL;
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current_length = 0;
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data_offset = 0;
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data_to_send = 0;
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return;
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}
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int this_offset;
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for (this_offset = data_offset; this_offset < (data_offset + data_to_send); this_offset++) {
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usb_ep_0_in_ibuf_head_write(current_data[this_offset]);
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}
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usb_ep_0_in_respond_write(EPF_ACK);
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return;
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}
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void usb_send(const void *data, int total_count) {
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while ((current_length || current_data))// && usb_ep_0_in_respond_read() != EPF_NAK)
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;
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current_data = (uint8_t *)data;
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current_length = total_count;
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data_offset = 0;
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data_to_send = 0;
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process_tx();
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}
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void usb_wait_for_send_done(void) {
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while (current_data && current_length)
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usb_poll();
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while ((usb_ep_0_in_dtb_read() & 1) == 1)
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usb_poll();
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}
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void usb_isr(void) {
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uint8_t ep0o_pending = usb_ep_0_out_ev_pending_read();
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uint8_t ep0i_pending = usb_ep_0_in_ev_pending_read();
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// We got an OUT or a SETUP packet. Copy it to usb_ep0out_buffer
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// and clear the "pending" bit.
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if (ep0o_pending) {
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uint8_t last_tok = usb_ep_0_out_last_tok_read();
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int byte_count = 0;
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usb_ep0out_last_tok[usb_ep0out_wr_ptr] = last_tok;
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volatile uint8_t * obuf = usb_ep0out_buffer[usb_ep0out_wr_ptr];
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if (!usb_ep_0_out_obuf_empty_read()) {
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while (!usb_ep_0_out_obuf_empty_read()) {
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obuf[byte_count++] = usb_ep_0_out_obuf_head_read();
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usb_ep_0_out_obuf_head_write(0);
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}
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}
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if (byte_count >= 2)
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usb_ep0out_buffer_len[usb_ep0out_wr_ptr] = byte_count - 2 /* Strip off CRC16 */;
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usb_ep0out_wr_ptr = (usb_ep0out_wr_ptr + 1) & (EP0OUT_BUFFERS-1);
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if (last_tok == USB_PID_SETUP) {
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usb_ep_0_in_dtb_write(1);
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data_offset = 0;
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current_length = 0;
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current_data = NULL;
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}
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usb_ep_0_out_ev_pending_write(ep0o_pending);
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usb_ep_0_out_respond_write(EPF_ACK);
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}
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// We just got an "IN" token. Send data if we have it.
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if (ep0i_pending) {
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usb_ep_0_in_respond_write(EPF_NAK);
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usb_ep_0_in_ev_pending_write(ep0i_pending);
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}
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return;
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}
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void usb_ack_in(void) {
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while (usb_ep_0_in_respond_read() == EPF_ACK)
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;
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usb_ep_0_in_respond_write(EPF_ACK);
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}
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void usb_ack_out(void) {
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while (usb_ep_0_out_respond_read() == EPF_ACK)
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;
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usb_ep_0_out_respond_write(EPF_ACK);
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}
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void usb_err(void) {
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usb_ep_0_out_respond_write(EPF_STALL);
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usb_ep_0_in_respond_write(EPF_STALL);
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}
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int usb_recv(void *buffer, unsigned int buffer_len) {
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// Set the OUT response to ACK, since we are in a position to receive data now.
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usb_ep_0_out_respond_write(EPF_ACK);
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while (1) {
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if (usb_ep0out_rd_ptr != usb_ep0out_wr_ptr) {
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if (usb_ep0out_last_tok[usb_ep0out_rd_ptr] == USB_PID_OUT) {
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unsigned int ep0_buffer_len = usb_ep0out_buffer_len[usb_ep0out_rd_ptr];
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if (ep0_buffer_len < buffer_len)
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buffer_len = ep0_buffer_len;
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// usb_ep0out_buffer_len[usb_ep0out_rd_ptr] = 0;
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memcpy(buffer, (void *)&usb_ep0out_buffer[usb_ep0out_rd_ptr], buffer_len);
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usb_ep0out_rd_ptr = (usb_ep0out_rd_ptr + 1) & (EP0OUT_BUFFERS-1);
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return buffer_len;
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}
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usb_ep0out_rd_ptr = (usb_ep0out_rd_ptr + 1) & (EP0OUT_BUFFERS-1);
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}
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}
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return 0;
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}
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void usb_poll(void) {
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// If some data was received, then process it.
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while (usb_ep0out_rd_ptr != usb_ep0out_wr_ptr) {
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const struct usb_setup_request *request = (const struct usb_setup_request *)(usb_ep0out_buffer[usb_ep0out_rd_ptr]);
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// uint8_t len = usb_ep0out_buffer_len[usb_ep0out_rd_ptr];
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uint8_t last_tok = usb_ep0out_last_tok[usb_ep0out_rd_ptr];
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// usb_ep0out_buffer_len[usb_ep0out_rd_ptr] = 0;
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usb_ep0out_rd_ptr = (usb_ep0out_rd_ptr + 1) & (EP0OUT_BUFFERS-1);
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if (last_tok == USB_PID_SETUP) {
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usb_setup(request);
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}
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}
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process_tx();
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}
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#endif /* CSR_USB_EP_0_OUT_EV_PENDING_ADDR */ |