--- /dev/null
+/*
+ * Copyright © 2012 Keith Packard <keithp@keithp.com>
+ *
+ * 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; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#include "ao.h"
+#include "ao_usb.h"
+#include "ao_product.h"
+
+#define USB_DEBUG 0
+#define USB_DEBUG_DATA 0
+
+#if USB_DEBUG
+#define debug(format, args...) printf(format, ## args);
+#else
+#define debug(format, args...)
+#endif
+
+#if USB_DEBUG_DATA
+#define debug_data(format, args...) printf(format, ## args);
+#else
+#define debug_data(format, args...)
+#endif
+
+struct ao_task ao_usb_task;
+
+struct ao_usb_setup {
+ uint8_t dir_type_recip;
+ uint8_t request;
+ uint16_t value;
+ uint16_t index;
+ uint16_t length;
+} ao_usb_setup;
+
+static uint8_t ao_usb_ep0_state;
+static const uint8_t * ao_usb_ep0_in_data;
+static uint8_t ao_usb_ep0_in_len;
+static uint8_t ao_usb_ep0_in_pending;
+static uint8_t ao_usb_ep0_in_buf[2];
+static uint8_t ao_usb_ep0_out_len;
+static uint8_t *ao_usb_ep0_out_data;
+static union stm_usb_bdt *ao_usb_bdt;
+static uint16_t ao_usb_sram_addr;
+static uint8_t ao_usb_tx_buffer[AO_USB_IN_SIZE];
+static uint8_t ao_usb_tx_count;
+static uint8_t ao_usb_rx_buffer[AO_USB_OUT_SIZE];
+static uint8_t ao_usb_rx_count, ao_usb_rx_pos;
+
+#define AO_USB_INT_EPR 1
+#define AO_USB_OUT_EPR 2
+#define AO_USB_IN_EPR 3
+
+/*
+ * Pointers into the USB packet buffer area
+ */
+static uint32_t *ao_usb_ep0_tx_buffer;
+static uint32_t *ao_usb_ep0_rx_buffer;
+
+static uint32_t *ao_usb_in_tx_buffer;
+static uint32_t *ao_usb_out_rx_buffer;
+
+static uint8_t ao_usb_in_flushed;
+static uint8_t ao_usb_in_pending;
+static uint8_t ao_usb_out_avail;
+static uint8_t ao_usb_running;
+static uint8_t ao_usb_configuration;
+static uint8_t ueienx_0;
+
+#define AO_USB_EP0_GOT_RESET 1
+#define AO_USB_EP0_GOT_SETUP 2
+#define AO_USB_EP0_GOT_RX_DATA 4
+#define AO_USB_EP0_GOT_TX_ACK 8
+
+static uint8_t ao_usb_ep0_receive;
+static uint8_t ao_usb_address;
+static uint8_t ao_usb_address_pending;
+
+static inline uint32_t set_toggle(uint32_t current_value,
+ uint32_t mask,
+ uint32_t desired_value)
+{
+ return (current_value ^ desired_value) & mask;
+}
+
+static inline uint32_t *ao_usb_packet_buffer_addr(uint16_t sram_addr)
+{
+ return (uint32_t *) (stm_usb_sram + 2 * sram_addr);
+}
+
+static inline uint32_t ao_usb_epr_stat_rx(uint32_t epr) {
+ return (epr >> STM_USB_EPR_STAT_RX) & STM_USB_EPR_STAT_RX_MASK;
+}
+
+static inline uint32_t ao_usb_epr_stat_tx(uint32_t epr) {
+ return (epr >> STM_USB_EPR_STAT_TX) & STM_USB_EPR_STAT_TX_MASK;
+}
+
+static inline uint32_t ao_usb_epr_ctr_rx(uint32_t epr) {
+ return (epr >> STM_USB_EPR_CTR_RX) & 1;
+}
+
+static inline uint32_t ao_usb_epr_ctr_tx(uint32_t epr) {
+ return (epr >> STM_USB_EPR_CTR_TX) & 1;
+}
+
+static inline uint32_t ao_usb_epr_setup(uint32_t epr) {
+ return (epr >> STM_USB_EPR_SETUP) & 1;
+}
+
+static inline uint32_t ao_usb_epr_dtog_rx(uint32_t epr) {
+ return (epr >> STM_USB_EPR_DTOG_RX) & 1;
+}
+
+static inline uint32_t ao_usb_epr_dtog_tx(uint32_t epr) {
+ return (epr >> STM_USB_EPR_DTOG_TX) & 1;
+}
+
+/*
+ * Set current device address and mark the
+ * interface as active
+ */
+void
+ao_usb_set_address(uint8_t address)
+{
+ debug("ao_usb_set_address %02x\n", address);
+ stm_usb.daddr = (1 << STM_USB_DADDR_EF) | address;
+ ao_usb_address_pending = 0;
+}
+
+/*
+ * Set just endpoint 0, for use during startup
+ */
+
+static void
+ao_usb_set_ep0(void)
+{
+ uint32_t epr;
+ int e;
+
+ ao_usb_sram_addr = 0;
+
+ /* buffer table is at the start of USB memory */
+ stm_usb.btable = 0;
+ ao_usb_bdt = (void *) stm_usb_sram;
+
+ ao_usb_sram_addr += 8 * STM_USB_BDT_SIZE;
+
+ /* Set up EP 0 - a Control end point with 32 bytes of in and out buffers */
+
+ ao_usb_bdt[0].single.addr_tx = ao_usb_sram_addr;
+ ao_usb_bdt[0].single.count_tx = 0;
+ ao_usb_ep0_tx_buffer = ao_usb_packet_buffer_addr(ao_usb_sram_addr);
+ ao_usb_sram_addr += AO_USB_CONTROL_SIZE;
+
+ ao_usb_bdt[0].single.addr_rx = ao_usb_sram_addr;
+ ao_usb_bdt[0].single.count_rx = ((1 << STM_USB_BDT_COUNT_RX_BL_SIZE) |
+ (((AO_USB_CONTROL_SIZE / 32) - 1) << STM_USB_BDT_COUNT_RX_NUM_BLOCK));
+ ao_usb_ep0_rx_buffer = ao_usb_packet_buffer_addr(ao_usb_sram_addr);
+ ao_usb_sram_addr += AO_USB_CONTROL_SIZE;
+
+ cli();
+ epr = stm_usb.epr[0];
+ epr = ((STM_USB_EPR_CTR_RX_WRITE_INVARIANT << STM_USB_EPR_CTR_RX) |
+ (STM_USB_EPR_DTOG_RX_WRITE_INVARIANT << STM_USB_EPR_DTOG_RX) |
+ set_toggle(epr,
+ (STM_USB_EPR_STAT_RX_MASK << STM_USB_EPR_STAT_RX),
+ (STM_USB_EPR_STAT_RX_VALID << STM_USB_EPR_STAT_RX)) |
+ (STM_USB_EPR_EP_TYPE_CONTROL << STM_USB_EPR_EP_TYPE) |
+ (0 << STM_USB_EPR_EP_KIND) |
+ (STM_USB_CTR_TX_WRITE_INVARIANT << STM_USB_EPR_CTR_TX) |
+ (STM_USB_EPR_DTOG_TX_WRITE_INVARIANT << STM_USB_EPR_DTOG_TX) |
+ set_toggle(epr,
+ (STM_USB_EPR_STAT_TX_MASK << STM_USB_EPR_STAT_TX),
+ (STM_USB_EPR_STAT_TX_NAK << STM_USB_EPR_STAT_TX)) |
+ (AO_USB_CONTROL_EP << STM_USB_EPR_EA));
+ stm_usb.epr[0] = epr;
+ sei();
+ debug ("epr 0 now %x\n", stm_usb.epr[0]);
+
+ /* Clear all of the other endpoints */
+ for (e = 1; e < 8; e++) {
+ cli();
+ epr = stm_usb.epr[e];
+ epr = ((STM_USB_EPR_CTR_RX_WRITE_INVARIANT << STM_USB_EPR_CTR_RX) |
+ (STM_USB_EPR_DTOG_RX_WRITE_INVARIANT << STM_USB_EPR_DTOG_RX) |
+ set_toggle(epr,
+ (STM_USB_EPR_STAT_RX_MASK << STM_USB_EPR_STAT_RX),
+ (STM_USB_EPR_STAT_RX_DISABLED << STM_USB_EPR_STAT_RX)) |
+ (STM_USB_EPR_EP_TYPE_CONTROL << STM_USB_EPR_EP_TYPE) |
+ (0 << STM_USB_EPR_EP_KIND) |
+ (STM_USB_CTR_TX_WRITE_INVARIANT << STM_USB_EPR_CTR_TX) |
+ (STM_USB_EPR_DTOG_TX_WRITE_INVARIANT << STM_USB_EPR_DTOG_TX) |
+ set_toggle(epr,
+ (STM_USB_EPR_STAT_TX_MASK << STM_USB_EPR_STAT_TX),
+ (STM_USB_EPR_STAT_TX_DISABLED << STM_USB_EPR_STAT_TX)) |
+ (0 << STM_USB_EPR_EA));
+ stm_usb.epr[e] = epr;
+ sei();
+ }
+
+ ao_usb_set_address(0);
+}
+
+static void
+ao_usb_set_configuration(void)
+{
+ uint32_t epr;
+
+ debug ("ao_usb_set_configuration\n");
+
+ /* Set up the INT end point */
+ ao_usb_bdt[AO_USB_INT_EPR].single.addr_tx = ao_usb_sram_addr;
+ ao_usb_bdt[AO_USB_INT_EPR].single.count_tx = 0;
+ ao_usb_in_tx_buffer = ao_usb_packet_buffer_addr(ao_usb_sram_addr);
+ ao_usb_sram_addr += AO_USB_INT_SIZE;
+
+ cli();
+ epr = stm_usb.epr[AO_USB_INT_EPR];
+ epr = ((0 << STM_USB_EPR_CTR_RX) |
+ (epr & (1 << STM_USB_EPR_DTOG_RX)) |
+ set_toggle(epr,
+ (STM_USB_EPR_STAT_RX_MASK << STM_USB_EPR_STAT_RX),
+ (STM_USB_EPR_STAT_RX_DISABLED << STM_USB_EPR_STAT_RX)) |
+ (STM_USB_EPR_EP_TYPE_CONTROL << STM_USB_EPR_EP_TYPE) |
+ (0 << STM_USB_EPR_EP_KIND) |
+ (0 << STM_USB_EPR_CTR_TX) |
+ (epr & (1 << STM_USB_EPR_DTOG_TX)) |
+ set_toggle(epr,
+ (STM_USB_EPR_STAT_TX_MASK << STM_USB_EPR_STAT_TX),
+ (STM_USB_EPR_STAT_TX_NAK << STM_USB_EPR_STAT_TX)) |
+ (AO_USB_INT_EP << STM_USB_EPR_EA));
+ stm_usb.epr[AO_USB_INT_EPR] = epr;
+ sei();
+ debug ("writing epr[%d] 0x%08x wrote 0x%08x\n",
+ AO_USB_INT_EPR, epr, stm_usb.epr[AO_USB_INT_EPR]);
+
+ /* Set up the OUT end point */
+ ao_usb_bdt[AO_USB_OUT_EPR].single.addr_rx = ao_usb_sram_addr;
+ ao_usb_bdt[AO_USB_OUT_EPR].single.count_rx = ((1 << STM_USB_BDT_COUNT_RX_BL_SIZE) |
+ (((AO_USB_OUT_SIZE / 32) - 1) << STM_USB_BDT_COUNT_RX_NUM_BLOCK));
+ ao_usb_out_rx_buffer = ao_usb_packet_buffer_addr(ao_usb_sram_addr);
+ ao_usb_sram_addr += AO_USB_OUT_SIZE;
+
+ cli();
+ epr = stm_usb.epr[AO_USB_OUT_EPR];
+ epr = ((0 << STM_USB_EPR_CTR_RX) |
+ (epr & (1 << STM_USB_EPR_DTOG_RX)) |
+ set_toggle(epr,
+ (STM_USB_EPR_STAT_RX_MASK << STM_USB_EPR_STAT_RX),
+ (STM_USB_EPR_STAT_RX_VALID << STM_USB_EPR_STAT_RX)) |
+ (STM_USB_EPR_EP_TYPE_CONTROL << STM_USB_EPR_EP_TYPE) |
+ (0 << STM_USB_EPR_EP_KIND) |
+ (0 << STM_USB_EPR_CTR_TX) |
+ (epr & (1 << STM_USB_EPR_DTOG_TX)) |
+ set_toggle(epr,
+ (STM_USB_EPR_STAT_TX_MASK << STM_USB_EPR_STAT_TX),
+ (STM_USB_EPR_STAT_TX_DISABLED << STM_USB_EPR_STAT_TX)) |
+ (AO_USB_OUT_EP << STM_USB_EPR_EA));
+ stm_usb.epr[AO_USB_OUT_EPR] = epr;
+ sei();
+ debug ("writing epr[%d] 0x%08x wrote 0x%08x\n",
+ AO_USB_OUT_EPR, epr, stm_usb.epr[AO_USB_OUT_EPR]);
+
+ /* Set up the IN end point */
+ ao_usb_bdt[AO_USB_IN_EPR].single.addr_tx = ao_usb_sram_addr;
+ ao_usb_bdt[AO_USB_IN_EPR].single.count_tx = 0;
+ ao_usb_in_tx_buffer = ao_usb_packet_buffer_addr(ao_usb_sram_addr);
+ ao_usb_sram_addr += AO_USB_IN_SIZE;
+
+ cli();
+ epr = stm_usb.epr[AO_USB_IN_EPR];
+ epr = ((0 << STM_USB_EPR_CTR_RX) |
+ (epr & (1 << STM_USB_EPR_DTOG_RX)) |
+ set_toggle(epr,
+ (STM_USB_EPR_STAT_RX_MASK << STM_USB_EPR_STAT_RX),
+ (STM_USB_EPR_STAT_RX_DISABLED << STM_USB_EPR_STAT_RX)) |
+ (STM_USB_EPR_EP_TYPE_CONTROL << STM_USB_EPR_EP_TYPE) |
+ (0 << STM_USB_EPR_EP_KIND) |
+ (0 << STM_USB_EPR_CTR_TX) |
+ (epr & (1 << STM_USB_EPR_DTOG_TX)) |
+ set_toggle(epr,
+ (STM_USB_EPR_STAT_TX_MASK << STM_USB_EPR_STAT_TX),
+ (STM_USB_EPR_STAT_TX_NAK << STM_USB_EPR_STAT_TX)) |
+ (AO_USB_IN_EP << STM_USB_EPR_EA));
+ stm_usb.epr[AO_USB_IN_EPR] = epr;
+ sei();
+ debug ("writing epr[%d] 0x%08x wrote 0x%08x\n",
+ AO_USB_IN_EPR, epr, stm_usb.epr[AO_USB_IN_EPR]);
+ ao_usb_running = 1;
+}
+
+static uint16_t control_count;
+static uint16_t in_count;
+static uint16_t out_count;
+static uint16_t reset_count;
+
+/*
+ * Write these values to preserve register contents under HW changes
+ */
+
+#define STM_USB_EPR_INVARIANT ((1 << STM_USB_EPR_CTR_RX) | \
+ (STM_USB_EPR_DTOG_RX_WRITE_INVARIANT << STM_USB_EPR_DTOG_RX) | \
+ (STM_USB_EPR_STAT_RX_WRITE_INVARIANT << STM_USB_EPR_STAT_RX) | \
+ (1 << STM_USB_EPR_CTR_TX) | \
+ (STM_USB_EPR_DTOG_TX_WRITE_INVARIANT << STM_USB_EPR_DTOG_TX) | \
+ (STM_USB_EPR_STAT_TX_WRITE_INVARIANT << STM_USB_EPR_STAT_TX))
+
+#define STM_USB_EPR_INVARIANT_MASK ((1 << STM_USB_EPR_CTR_RX) | \
+ (STM_USB_EPR_DTOG_RX_MASK << STM_USB_EPR_DTOG_RX) | \
+ (STM_USB_EPR_STAT_RX_MASK << STM_USB_EPR_STAT_RX) | \
+ (1 << STM_USB_EPR_CTR_TX) | \
+ (STM_USB_EPR_DTOG_TX_MASK << STM_USB_EPR_DTOG_TX) | \
+ (STM_USB_EPR_STAT_TX_MASK << STM_USB_EPR_STAT_TX))
+
+/*
+ * These bits are purely under sw control, so preserve them in the
+ * register by re-writing what was read
+ */
+#define STM_USB_EPR_PRESERVE_MASK ((STM_USB_EPR_EP_TYPE_MASK << STM_USB_EPR_EP_TYPE) | \
+ (1 << STM_USB_EPR_EP_KIND) | \
+ (STM_USB_EPR_EA_MASK << STM_USB_EPR_EA))
+
+void
+stm_usb_lp_isr(void)
+{
+ uint32_t istr = stm_usb.istr;
+
+ if (istr & (1 << STM_USB_ISTR_CTR)) {
+ uint8_t ep = istr & STM_USB_ISTR_EP_ID_MASK;
+ uint32_t epr, epr_write;
+
+ /* Preserve the SW write bits, don't mess with most HW writable bits,
+ * clear the CTR_RX and CTR_TX bits
+ */
+ epr = stm_usb.epr[ep];
+ epr_write = epr;
+ epr_write &= STM_USB_EPR_PRESERVE_MASK;
+ epr_write |= STM_USB_EPR_INVARIANT;
+ epr_write &= ~(1 << STM_USB_EPR_CTR_RX);
+ epr_write &= ~(1 << STM_USB_EPR_CTR_TX);
+ stm_usb.epr[ep] = epr_write;
+
+ switch (ep) {
+ case 0:
+ ++control_count;
+ if (ao_usb_epr_ctr_rx(epr)) {
+ if (ao_usb_epr_setup(epr))
+ ao_usb_ep0_receive |= AO_USB_EP0_GOT_SETUP;
+ else
+ ao_usb_ep0_receive |= AO_USB_EP0_GOT_RX_DATA;
+ }
+ if (ao_usb_epr_ctr_tx(epr))
+ ao_usb_ep0_receive |= AO_USB_EP0_GOT_TX_ACK;
+ ao_wakeup(&ao_usb_ep0_receive);
+ break;
+ case AO_USB_OUT_EPR:
+ ++out_count;
+ if (ao_usb_epr_ctr_rx(epr)) {
+ ao_usb_out_avail = 1;
+ ao_wakeup(&ao_stdin_ready);
+ }
+ break;
+ case AO_USB_IN_EPR:
+ ++in_count;
+ if (ao_usb_epr_ctr_tx(epr)) {
+ ao_usb_in_pending = 0;
+ ao_wakeup(&ao_usb_in_pending);
+ }
+ break;
+ }
+ return;
+ }
+
+ if (istr & (1 << STM_USB_ISTR_RESET)) {
+ ++reset_count;
+ stm_usb.istr &= ~(1 << STM_USB_ISTR_RESET);
+ ao_usb_ep0_receive |= AO_USB_EP0_GOT_RESET;
+ ao_wakeup(&ao_usb_ep0_receive);
+ }
+}
+
+void
+stm_usb_hp_isr(void)
+{
+ stm_usb_lp_isr();
+}
+
+void
+stm_usb_fs_wkup(void)
+{
+ /* USB wakeup, just clear the bit for now */
+ stm_usb.istr &= ~(1 << STM_USB_ISTR_WKUP);
+}
+
+static struct ao_usb_line_coding ao_usb_line_coding = {115200, 0, 0, 8};
+
+/* Walk through the list of descriptors and find a match
+ */
+static void
+ao_usb_get_descriptor(uint16_t value)
+{
+ const uint8_t *descriptor;
+ uint8_t type = value >> 8;
+ uint8_t index = value;
+
+ descriptor = ao_usb_descriptors;
+ while (descriptor[0] != 0) {
+ if (descriptor[1] == type && index-- == 0) {
+ if (type == AO_USB_DESC_CONFIGURATION)
+ ao_usb_ep0_in_len = descriptor[2];
+ else
+ ao_usb_ep0_in_len = descriptor[0];
+ ao_usb_ep0_in_data = descriptor;
+ break;
+ }
+ descriptor += descriptor[0];
+ }
+}
+
+static void
+ao_usb_ep0_set_in_pending(uint8_t in_pending)
+{
+ ao_usb_ep0_in_pending = in_pending;
+
+#if 0
+ if (in_pending)
+ ueienx_0 = ((1 << RXSTPE) | (1 << RXOUTE) | (1 << TXINE)); /* Enable IN interrupt */
+#endif
+}
+
+/* The USB memory holds 16 bit values on 32 bit boundaries
+ * and must be accessed only in 32 bit units. Sigh.
+ */
+
+static inline void
+ao_usb_write_byte(uint8_t byte, uint32_t *base, uint16_t offset)
+{
+ base += offset >> 1;
+ if (offset & 1) {
+ *base = (*base & 0xff) | ((uint32_t) byte << 8);
+ } else {
+ *base = (*base & 0xff00) | byte;
+ }
+}
+
+static inline void
+ao_usb_write_short(uint16_t data, uint32_t *base, uint16_t offset)
+{
+ base[offset>>1] = data;
+}
+
+static void
+ao_usb_write(const uint8_t *src, uint32_t *base, uint16_t offset, uint16_t bytes)
+{
+ if (!bytes)
+ return;
+ if (offset & 1) {
+ debug_data (" %02x", src[0]);
+ ao_usb_write_byte(*src++, base, offset++);
+ bytes--;
+ }
+ while (bytes >= 2) {
+ debug_data (" %02x %02x", src[0], src[1]);
+ ao_usb_write_short((src[1] << 8) | src[0], base, offset);
+ offset += 2;
+ src += 2;
+ bytes -= 2;
+ }
+ if (bytes) {
+ debug_data (" %02x", src[0]);
+ ao_usb_write_byte(*src, base, offset);
+ }
+}
+
+static inline uint8_t
+ao_usb_read_byte(uint32_t *base, uint16_t offset)
+{
+ base += offset >> 1;
+ if (offset & 1)
+ return (*base >> 8) & 0xff;
+ else
+ return *base & 0xff;
+}
+
+static inline uint16_t
+ao_usb_read_short(uint32_t *base, uint16_t offset)
+{
+ return base[offset>>1];
+}
+
+static void
+ao_usb_read(uint8_t *dst, uint32_t *base, uint16_t offset, uint16_t bytes)
+{
+ if (!bytes)
+ return;
+ if (offset & 1) {
+ *dst++ = ao_usb_read_byte(base, offset++);
+ debug_data (" %02x", dst[-1]);
+ bytes--;
+ }
+ while (bytes >= 2) {
+ uint16_t s = ao_usb_read_short(base, offset);
+ dst[0] = s;
+ dst[1] = s >> 8;
+ debug_data (" %02x %02x", dst[0], dst[1]);
+ offset += 2;
+ dst += 2;
+ bytes -= 2;
+ }
+ if (bytes) {
+ *dst = ao_usb_read_byte(base, offset);
+ debug_data (" %02x", dst[0]);
+ }
+}
+
+static inline void
+ao_usb_set_stat_tx(int ep, uint32_t stat_tx) {
+ uint32_t epr_write, epr_old, epr_new, epr_want;
+
+ cli();
+ epr_write = epr_old = stm_usb.epr[ep];
+ epr_write &= STM_USB_EPR_PRESERVE_MASK;
+ epr_write |= STM_USB_EPR_INVARIANT;
+ epr_write |= set_toggle(epr_old,
+ STM_USB_EPR_STAT_TX_MASK << STM_USB_EPR_STAT_TX,
+ stat_tx << STM_USB_EPR_STAT_TX);
+ stm_usb.epr[ep] = epr_write;
+ epr_new = stm_usb.epr[ep];
+ sei();
+ epr_want = (epr_old & ~(STM_USB_EPR_STAT_TX_MASK << STM_USB_EPR_STAT_TX)) |
+ (stat_tx << STM_USB_EPR_STAT_TX);
+ if (epr_new != epr_want) {
+ debug ("**** set_stat_tx to %x. old %08x want %08x write %08x new %08x\n",
+ stat_tx, epr_old, epr_want, epr_write, epr_new);
+ }
+}
+
+/* Send an IN data packet */
+static void
+ao_usb_ep0_flush(void)
+{
+ uint8_t this_len;
+
+ /* Check to see if the endpoint is still busy */
+ if (ao_usb_epr_stat_tx(stm_usb.epr[0]) == STM_USB_EPR_STAT_TX_VALID) {
+ debug("EP0 not accepting IN data\n");
+ ao_usb_ep0_set_in_pending(1);
+ } else {
+ this_len = ao_usb_ep0_in_len;
+ if (this_len > AO_USB_CONTROL_SIZE)
+ this_len = AO_USB_CONTROL_SIZE;
+
+ ao_usb_ep0_in_len -= this_len;
+
+ /* Set IN interrupt enable */
+ if (ao_usb_ep0_in_len == 0 && this_len != AO_USB_CONTROL_SIZE)
+ ao_usb_ep0_set_in_pending(0);
+ else
+ ao_usb_ep0_set_in_pending(1);
+
+ debug_data ("Flush EP0 len %d:", this_len);
+ ao_usb_write(ao_usb_ep0_in_data, ao_usb_ep0_tx_buffer, 0, this_len);
+ debug_data ("\n");
+ ao_usb_ep0_in_data += this_len;
+
+ /* Mark the endpoint as TX valid to send the packet */
+ ao_usb_bdt[0].single.count_tx = this_len;
+ ao_usb_set_stat_tx(0, STM_USB_EPR_STAT_TX_VALID);
+ debug ("queue tx. epr 0 now %08x\n", stm_usb.epr[0]);
+ }
+}
+
+static inline void
+ao_usb_set_stat_rx(int ep, uint32_t stat_rx) {
+ uint32_t epr_write, epr_old, epr_new, epr_want;
+
+ cli();
+ epr_write = epr_old = stm_usb.epr[ep];
+ epr_write &= STM_USB_EPR_PRESERVE_MASK;
+ epr_write |= STM_USB_EPR_INVARIANT;
+ epr_write |= set_toggle(epr_old,
+ STM_USB_EPR_STAT_RX_MASK << STM_USB_EPR_STAT_RX,
+ stat_rx << STM_USB_EPR_STAT_RX);
+ stm_usb.epr[ep] = epr_write;
+ epr_new = stm_usb.epr[ep];
+ sei();
+ epr_want = (epr_old & ~(STM_USB_EPR_STAT_RX_MASK << STM_USB_EPR_STAT_RX)) |
+ (stat_rx << STM_USB_EPR_STAT_RX);
+ if (epr_new != epr_want) {
+ debug ("**** set_stat_rx to %x. old %08x want %08x write %08x new %08x\n",
+ stat_rx, epr_old, epr_want, epr_write, epr_new);
+ }
+}
+
+/* Read data from the ep0 OUT fifo */
+static void
+ao_usb_ep0_fill(void)
+{
+ uint16_t len = ao_usb_bdt[0].single.count_rx & STM_USB_BDT_COUNT_RX_COUNT_RX_MASK;
+
+ if (len > ao_usb_ep0_out_len)
+ len = ao_usb_ep0_out_len;
+ ao_usb_ep0_out_len -= len;
+
+ /* Pull all of the data out of the packet */
+ debug_data ("Fill EP0 len %d:", len);
+ ao_usb_read(ao_usb_ep0_out_data, ao_usb_ep0_rx_buffer, 0, len);
+ debug_data ("\n");
+ ao_usb_ep0_out_data += len;
+
+ /* ACK the packet */
+ ao_usb_set_stat_rx(0, STM_USB_EPR_STAT_RX_VALID);
+}
+
+void
+ao_usb_ep0_queue_byte(uint8_t a)
+{
+ ao_usb_ep0_in_buf[ao_usb_ep0_in_len++] = a;
+}
+
+static void
+ao_usb_ep0_setup(void)
+{
+ /* Pull the setup packet out of the fifo */
+ ao_usb_ep0_out_data = (uint8_t *) &ao_usb_setup;
+ ao_usb_ep0_out_len = 8;
+ ao_usb_ep0_fill();
+ if (ao_usb_ep0_out_len != 0) {
+ debug ("invalid setup packet length\n");
+ return;
+ }
+
+ /* Figure out how to ACK the setup packet */
+ if (ao_usb_setup.dir_type_recip & AO_USB_DIR_IN) {
+ if (ao_usb_setup.length)
+ ao_usb_ep0_state = AO_USB_EP0_DATA_IN;
+ else
+ ao_usb_ep0_state = AO_USB_EP0_IDLE;
+ } else {
+ if (ao_usb_setup.length)
+ ao_usb_ep0_state = AO_USB_EP0_DATA_OUT;
+ else
+ ao_usb_ep0_state = AO_USB_EP0_IDLE;
+ }
+
+ ao_usb_ep0_in_data = ao_usb_ep0_in_buf;
+ ao_usb_ep0_in_len = 0;
+ switch(ao_usb_setup.dir_type_recip & AO_USB_SETUP_TYPE_MASK) {
+ case AO_USB_TYPE_STANDARD:
+ debug ("Standard setup packet\n");
+ switch(ao_usb_setup.dir_type_recip & AO_USB_SETUP_RECIP_MASK) {
+ case AO_USB_RECIP_DEVICE:
+ debug ("Device setup packet\n");
+ switch(ao_usb_setup.request) {
+ case AO_USB_REQ_GET_STATUS:
+ debug ("get status\n");
+ ao_usb_ep0_queue_byte(0);
+ ao_usb_ep0_queue_byte(0);
+ break;
+ case AO_USB_REQ_SET_ADDRESS:
+ debug ("set address %d\n", ao_usb_setup.value);
+ ao_usb_address = ao_usb_setup.value;
+ ao_usb_address_pending = 1;
+ break;
+ case AO_USB_REQ_GET_DESCRIPTOR:
+ debug ("get descriptor %d\n", ao_usb_setup.value);
+ ao_usb_get_descriptor(ao_usb_setup.value);
+ break;
+ case AO_USB_REQ_GET_CONFIGURATION:
+ debug ("get configuration %d\n", ao_usb_configuration);
+ ao_usb_ep0_queue_byte(ao_usb_configuration);
+ break;
+ case AO_USB_REQ_SET_CONFIGURATION:
+ ao_usb_configuration = ao_usb_setup.value;
+ debug ("set configuration %d\n", ao_usb_configuration);
+ ao_usb_set_configuration();
+ break;
+ }
+ break;
+ case AO_USB_RECIP_INTERFACE:
+ debug ("Interface setup packet\n");
+ switch(ao_usb_setup.request) {
+ case AO_USB_REQ_GET_STATUS:
+ ao_usb_ep0_queue_byte(0);
+ ao_usb_ep0_queue_byte(0);
+ break;
+ case AO_USB_REQ_GET_INTERFACE:
+ ao_usb_ep0_queue_byte(0);
+ break;
+ case AO_USB_REQ_SET_INTERFACE:
+ break;
+ }
+ break;
+ case AO_USB_RECIP_ENDPOINT:
+ debug ("Endpoint setup packet\n");
+ switch(ao_usb_setup.request) {
+ case AO_USB_REQ_GET_STATUS:
+ ao_usb_ep0_queue_byte(0);
+ ao_usb_ep0_queue_byte(0);
+ break;
+ }
+ break;
+ }
+ break;
+ case AO_USB_TYPE_CLASS:
+ debug ("Class setup packet\n");
+ switch (ao_usb_setup.request) {
+ case SET_LINE_CODING:
+ debug ("set line coding\n");
+ ao_usb_ep0_out_len = 7;
+ ao_usb_ep0_out_data = (uint8_t *) &ao_usb_line_coding;
+ break;
+ case GET_LINE_CODING:
+ debug ("get line coding\n");
+ ao_usb_ep0_in_len = 7;
+ ao_usb_ep0_in_data = (uint8_t *) &ao_usb_line_coding;
+ break;
+ case SET_CONTROL_LINE_STATE:
+ break;
+ }
+ break;
+ }
+ if (ao_usb_ep0_state != AO_USB_EP0_DATA_OUT) {
+ if (ao_usb_setup.length < ao_usb_ep0_in_len)
+ ao_usb_ep0_in_len = ao_usb_setup.length;
+ ao_usb_ep0_flush();
+ }
+}
+
+/* End point 0 receives all of the control messages. */
+static void
+ao_usb_ep0(void)
+{
+ uint8_t intx, udint;
+
+ debug ("usb task started\n");
+ ao_usb_ep0_state = AO_USB_EP0_IDLE;
+ for (;;) {
+ uint8_t receive;
+ ao_arch_critical(
+ while (!(receive = ao_usb_ep0_receive))
+ ao_sleep(&ao_usb_ep0_receive);
+ ao_usb_ep0_receive = 0;
+ );
+
+ if (receive & AO_USB_EP0_GOT_RESET) {
+ debug ("\treset\n");
+ ao_usb_set_ep0();
+ continue;
+ }
+ if (receive & AO_USB_EP0_GOT_SETUP) {
+ debug ("\tsetup\n");
+ ao_usb_ep0_setup();
+ }
+ if (receive & AO_USB_EP0_GOT_RX_DATA) {
+ debug ("\tgot rx data\n");
+ ao_usb_ep0_fill();
+ ao_usb_ep0_set_in_pending(1);
+ }
+ if (receive & AO_USB_EP0_GOT_TX_ACK) {
+ debug ("\tgot tx ack\n");
+ ao_usb_ep0_flush();
+ if (ao_usb_address_pending) {
+ ao_usb_set_address(ao_usb_address);
+ ao_usb_set_configuration();
+ }
+ }
+ }
+}
+
+/* Queue the current IN buffer for transmission */
+static void
+ao_usb_in_send(void)
+{
+ debug ("send %d\n", ao_usb_tx_count);
+ ao_usb_write(ao_usb_tx_buffer, ao_usb_in_tx_buffer, 0, ao_usb_tx_count);
+ ao_usb_bdt[AO_USB_IN_EPR].single.count_tx = ao_usb_tx_count;
+ ao_usb_set_stat_tx(AO_USB_IN_EPR, STM_USB_EPR_STAT_TX_VALID);
+ ao_usb_in_pending = 1;
+ ao_usb_tx_count = 0;
+}
+
+/* Wait for a free IN buffer */
+static void
+ao_usb_in_wait(void)
+{
+ for (;;) {
+ /* Check if the current buffer is writable */
+ if (ao_usb_tx_count < AO_USB_IN_SIZE)
+ break;
+
+ cli();
+ /* Wait for an IN buffer to be ready */
+ while (ao_usb_in_pending)
+ ao_sleep(&ao_usb_in_pending);
+ sei();
+ }
+}
+
+void
+ao_usb_flush(void) __critical
+{
+ if (!ao_usb_running)
+ return;
+
+ /* Anytime we've sent a character since
+ * the last time we flushed, we'll need
+ * to send a packet -- the only other time
+ * we would send a packet is when that
+ * packet was full, in which case we now
+ * want to send an empty packet
+ */
+ if (!ao_usb_in_flushed) {
+ ao_usb_in_flushed = 1;
+ cli();
+ /* Wait for an IN buffer to be ready */
+ while (ao_usb_in_pending)
+ ao_sleep(&ao_usb_in_pending);
+ sei();
+ ao_usb_in_send();
+ }
+}
+
+void
+ao_usb_putchar(char c) __critical __reentrant
+{
+ if (!ao_usb_running)
+ return;
+
+ ao_usb_in_wait();
+
+ ao_usb_tx_buffer[ao_usb_tx_count++] = (uint8_t) c;
+
+ /* Send the packet when full */
+ if (ao_usb_tx_count == AO_USB_IN_SIZE)
+ ao_usb_in_send();
+ ao_usb_in_flushed = 0;
+}
+
+static void
+ao_usb_out_recv(void)
+{
+ ao_usb_out_avail = 0;
+
+ ao_usb_rx_count = ao_usb_bdt[AO_USB_OUT_EPR].single.count_rx & STM_USB_BDT_COUNT_RX_COUNT_RX_MASK;
+
+ debug ("recv %d\n", ao_usb_rx_count);
+ debug_data("Fill OUT len %d:", ao_usb_rx_count);
+ ao_usb_read(ao_usb_rx_buffer, ao_usb_out_rx_buffer, 0, ao_usb_rx_count);
+ debug_data("\n");
+ ao_usb_rx_pos = 0;
+
+ /* ACK the packet */
+ ao_usb_set_stat_rx(AO_USB_OUT_EPR, STM_USB_EPR_STAT_RX_VALID);
+}
+
+static char
+_ao_usb_pollchar(void)
+{
+ char c;
+
+ if (!ao_usb_running)
+ return AO_READ_AGAIN;
+
+ for (;;) {
+ if (ao_usb_rx_pos != ao_usb_rx_count)
+ break;
+
+ /* Check to see if a packet has arrived */
+ if (!ao_usb_out_avail)
+ return AO_READ_AGAIN;
+ ao_usb_out_recv();
+ }
+
+ /* Pull a character out of the fifo */
+ c = ao_usb_rx_buffer[ao_usb_rx_pos++];
+ return c;
+}
+
+char
+ao_usb_pollchar(void)
+{
+ char c;
+ cli();
+ c = _ao_usb_pollchar();
+ sei();
+ return c;
+}
+
+char
+ao_usb_getchar(void) __critical
+{
+ char c;
+
+ cli();
+ while ((c = _ao_usb_pollchar()) == AO_READ_AGAIN)
+ ao_sleep(&ao_stdin_ready);
+ sei();
+ return c;
+}
+
+void
+ao_usb_disable(void)
+{
+ stm_usb.cntr = (1 << STM_USB_CNTR_FRES);
+ stm_usb.istr = 0;
+
+ /* Disable USB pull-up */
+ stm_syscfg.pmc &= ~(1 << STM_SYSCFG_PMC_USB_PU);
+
+ /* Switch off the device */
+ stm_usb.cntr = (1 << STM_USB_CNTR_PDWN) | (1 << STM_USB_CNTR_FRES);
+
+ /* Disable the interface */
+ stm_rcc.apb1enr &+ ~(1 << STM_RCC_APB1ENR_USBEN);
+}
+
+void
+ao_usb_enable(void)
+{
+ uint16_t tick;
+
+ /* Enable SYSCFG */
+ stm_rcc.apb2enr |= (1 << STM_RCC_APB2ENR_SYSCFGEN);
+
+ /* Disable USB pull-up */
+ stm_syscfg.pmc &= ~(1 << STM_SYSCFG_PMC_USB_PU);
+
+ /* Enable USB device */
+ stm_rcc.apb1enr |= (1 << STM_RCC_APB1ENR_USBEN);
+
+ /* Do not touch the GPIOA configuration; USB takes priority
+ * over GPIO on pins A11 and A12, but if you select alternate
+ * input 10 (the documented correct selection), then USB is
+ * pulled low and doesn't work at all
+ */
+
+ /* Route interrupts */
+ stm_nvic_set_priority(STM_ISR_USB_LP_POS, 3);
+ stm_nvic_set_enable(STM_ISR_USB_LP_POS);
+
+ ao_usb_configuration = 0;
+
+ stm_usb.cntr = (1 << STM_USB_CNTR_FRES);
+
+ /* Clear the power down bit */
+ stm_usb.cntr = 0;
+
+ /* Clear any spurious interrupts */
+ stm_usb.istr = 0;
+
+ debug ("ao_usb_enable\n");
+
+ /* Enable interrupts */
+ stm_usb.cntr = ((1 << STM_USB_CNTR_CTRM) |
+ (0 << STM_USB_CNTR_PMAOVRM) |
+ (0 << STM_USB_CNTR_ERRM) |
+ (0 << STM_USB_CNTR_WKUPM) |
+ (0 << STM_USB_CNTR_SUSPM) |
+ (1 << STM_USB_CNTR_RESETM) |
+ (0 << STM_USB_CNTR_SOFM) |
+ (0 << STM_USB_CNTR_ESOFM) |
+ (0 << STM_USB_CNTR_RESUME) |
+ (0 << STM_USB_CNTR_FSUSP) |
+ (0 << STM_USB_CNTR_LP_MODE) |
+ (0 << STM_USB_CNTR_PDWN) |
+ (0 << STM_USB_CNTR_FRES));
+
+ /* Enable USB pull-up */
+ stm_syscfg.pmc |= (1 << STM_SYSCFG_PMC_USB_PU);
+}
+
+#if USB_DEBUG
+struct ao_task ao_usb_echo_task;
+
+static void
+ao_usb_echo(void)
+{
+ char c;
+
+ for (;;) {
+ c = ao_usb_getchar();
+ ao_usb_putchar(c);
+ ao_usb_flush();
+ }
+}
+#endif
+
+static void
+ao_usb_irq(void)
+{
+ printf ("control: %d out: %d in: %d reset: %d\n",
+ control_count, out_count, in_count, reset_count);
+}
+
+__code struct ao_cmds ao_usb_cmds[] = {
+ { ao_usb_irq, "I\0Show USB interrupt counts" },
+ { 0, NULL }
+};
+
+void
+ao_usb_init(void)
+{
+ ao_usb_enable();
+
+ debug ("ao_usb_init\n");
+ ao_add_task(&ao_usb_task, ao_usb_ep0, "usb");
+#if USB_DEBUG
+ ao_add_task(&ao_usb_echo_task, ao_usb_echo, "usb echo");
+#endif
+ ao_cmd_register(&ao_usb_cmds[0]);
+#if !USB_DEBUG
+ ao_add_stdio(ao_usb_pollchar, ao_usb_putchar, ao_usb_flush);
+#endif
+}
projects / fw / altos / commitdiff