Diff: targets/TARGET_Maxim/USBHAL_Maxim.cpp

Revision:

71:53949e6131f6

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_Maxim/USBHAL_Maxim.cpp	Thu Jul 27 12:14:04 2017 +0100
@@ -0,0 +1,489 @@
+/*******************************************************************************
+ * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
+ * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Except as contained in this notice, the name of Maxim Integrated
+ * Products, Inc. shall not be used except as stated in the Maxim Integrated
+ * Products, Inc. Branding Policy.
+ *
+ * The mere transfer of this software does not imply any licenses
+ * of trade secrets, proprietary technology, copyrights, patents,
+ * trademarks, maskwork rights, or any other form of intellectual
+ * property whatsoever. Maxim Integrated Products, Inc. retains all
+ * ownership rights.
+ *******************************************************************************
+ */
+
+#if defined(TARGET_Maxim)
+
+#include "USBHAL.h"
+#include "usb_regs.h"
+#include "clkman_regs.h"
+
+#if defined(TARGET_MAX32625) || defined(TARGET_MAX32630)
+#include "pwrman_regs.h"
+#endif
+
+#define CONNECT_INTS    (MXC_F_USB_DEV_INTEN_BRST | MXC_F_USB_DEV_INTEN_SETUP | MXC_F_USB_DEV_INTEN_EP_IN | MXC_F_USB_DEV_INTEN_EP_OUT | MXC_F_USB_DEV_INTEN_DMA_ERR)
+
+USBHAL *USBHAL::instance;
+
+typedef struct {
+    volatile uint32_t buf0_desc;
+    volatile uint32_t buf0_address;
+    volatile uint32_t buf1_desc;
+    volatile uint32_t buf1_address;
+} ep_buffer_t;
+
+typedef struct {
+    ep_buffer_t out_buffer;
+    ep_buffer_t in_buffer;
+} ep0_buffer_t;
+
+typedef struct {
+    ep0_buffer_t ep0;
+    ep_buffer_t ep[MXC_USB_NUM_EP - 1];
+} ep_buffer_descriptor_t;
+
+// Static storage for endpoint buffer descriptor table. Must be 512 byte aligned for DMA.
+#ifdef __IAR_SYSTEMS_ICC__
+#pragma data_alignment = 512
+#else
+__attribute__ ((aligned (512))) 
+#endif
+ep_buffer_descriptor_t ep_buffer_descriptor;
+
+// static storage for temporary data buffers. Must be 32 byte aligned.
+#ifdef __IAR_SYSTEMS_ICC__
+#pragma data_alignment = 4
+#else
+__attribute__ ((aligned (4))) 
+#endif
+static uint8_t aligned_buffer[NUMBER_OF_LOGICAL_ENDPOINTS][MXC_USB_MAX_PACKET];
+
+// control packet state
+static enum {
+    CTRL_NONE = 0,
+    CTRL_SETUP,
+    CTRL_OUT,
+    CTRL_IN,
+} control_state;
+
+USBHAL::USBHAL(void)
+{
+    NVIC_DisableIRQ(USB_IRQn);
+
+#if defined(TARGET_MAX32600)
+    // The PLL must be enabled for USB
+    MBED_ASSERT(MXC_CLKMAN->clk_config & MXC_F_CLKMAN_CLK_CONFIG_PLL_ENABLE);
+
+    // Enable the USB clock
+    MXC_CLKMAN->clk_ctrl |= MXC_F_CLKMAN_CLK_CTRL_USB_GATE_N;
+#elif defined(TARGET_MAX32620)
+    // Enable the USB clock
+    MXC_CLKMAN->clk_ctrl |= MXC_F_CLKMAN_CLK_CTRL_USB_CLOCK_ENABLE;
+#endif
+
+    // reset the device
+    MXC_USB->cn = 0;
+    MXC_USB->cn = MXC_F_USB_CN_USB_EN;
+    MXC_USB->dev_inten = 0;
+    MXC_USB->dev_cn = 0;
+    MXC_USB->dev_cn = MXC_F_USB_DEV_CN_URST;
+    MXC_USB->dev_cn = 0;
+
+    // fill in callback arrays
+    epCallback[EP0OUT] = NULL;
+    epCallback[EP0IN]  = NULL;
+    epCallback[EP1OUT] = &USBHAL::EP1_OUT_callback;
+    epCallback[EP1IN ] = &USBHAL::EP1_IN_callback;
+    epCallback[EP2OUT] = &USBHAL::EP2_OUT_callback;
+    epCallback[EP2IN ] = &USBHAL::EP2_IN_callback;
+    epCallback[EP3OUT] = &USBHAL::EP3_OUT_callback;
+    epCallback[EP3IN ] = &USBHAL::EP3_IN_callback;
+    epCallback[EP4OUT] = &USBHAL::EP4_OUT_callback;
+    epCallback[EP4IN ] = &USBHAL::EP4_IN_callback;
+    epCallback[EP5OUT] = &USBHAL::EP5_OUT_callback;
+    epCallback[EP5IN ] = &USBHAL::EP5_IN_callback;
+    epCallback[EP6OUT] = &USBHAL::EP6_OUT_callback;
+    epCallback[EP6IN ] = &USBHAL::EP6_IN_callback;
+    epCallback[EP7OUT] = &USBHAL::EP7_OUT_callback;
+    epCallback[EP7IN ] = &USBHAL::EP7_IN_callback;
+
+    // clear driver state
+    control_state = CTRL_NONE;
+
+    // set the descriptor location
+    MXC_USB->ep_base = (uint32_t)&ep_buffer_descriptor;
+
+    // enable VBUS interrupts
+    MXC_USB->dev_inten = MXC_F_USB_DEV_INTEN_NO_VBUS | MXC_F_USB_DEV_INTEN_VBUS;
+
+    // attach IRQ handler and enable interrupts
+    instance = this;
+    NVIC_SetVector(USB_IRQn, &_usbisr);
+    NVIC_EnableIRQ(USB_IRQn);
+}
+
+USBHAL::~USBHAL(void)
+{
+    MXC_USB->dev_cn = MXC_F_USB_DEV_CN_URST;
+    MXC_USB->dev_cn = 0;
+    MXC_USB->cn = 0;
+}
+
+void USBHAL::connect(void)
+{
+    // enable interrupts
+    MXC_USB->dev_inten |= CONNECT_INTS;
+
+    // allow interrupts on ep0
+    MXC_USB->ep[0] |= MXC_F_USB_EP_INT_EN;
+
+    // pullup enable
+    MXC_USB->dev_cn |= (MXC_F_USB_DEV_CN_CONNECT | MXC_F_USB_DEV_CN_FIFO_MODE);
+}
+
+void USBHAL::disconnect(void)
+{
+    // disable interrupts
+    MXC_USB->dev_inten &= ~CONNECT_INTS;
+
+    // disable pullup
+    MXC_USB->dev_cn &= ~MXC_F_USB_DEV_CN_CONNECT;
+}
+
+void USBHAL::configureDevice(void)
+{
+    // do nothing
+}
+
+void USBHAL::unconfigureDevice(void)
+{
+    // reset endpoints
+    for (int i = 0; i < MXC_USB_NUM_EP; i++) {
+        // Disable endpoint and clear the data toggle
+        MXC_USB->ep[i] &= ~MXC_F_USB_EP_DIR;
+        MXC_USB->ep[i] |= MXC_F_USB_EP_DT;
+    }
+}
+
+void USBHAL::setAddress(uint8_t address)
+{
+    // do nothing
+}
+
+void USBHAL::remoteWakeup(void)
+{
+    // do nothing
+}
+
+static ep_buffer_t *get_desc(uint8_t endpoint)
+{
+    uint8_t epnum = EP_NUM(endpoint);
+    ep_buffer_t *desc;
+
+    if (epnum == 0) {
+        if (IN_EP(endpoint)) {
+            desc = &ep_buffer_descriptor.ep0.in_buffer;
+        } else {
+            desc = &ep_buffer_descriptor.ep0.out_buffer;
+        }
+    } else {
+        desc = &ep_buffer_descriptor.ep[epnum - 1];
+    }
+
+    return desc;
+}
+
+void USBHAL::EP0setup(uint8_t *buffer)
+{
+    // Setup packet is fixed at 8 bytes
+    // Setup registers cannot be read in byte mode
+    uint32_t *ptr32 = (uint32_t*)buffer;
+    ptr32[0] = (uint32_t)MXC_USB->setup0;
+    ptr32[1] = (uint32_t)MXC_USB->setup1;
+}
+
+void USBHAL::EP0read(void)
+{
+    if (control_state == CTRL_IN) {
+        // This is the status stage. ACK.
+        MXC_USB->ep[0] |= MXC_F_USB_EP_ST_ACK;
+        control_state = CTRL_NONE;
+        return;
+    }
+
+    control_state = CTRL_OUT;
+
+    endpointRead(EP0OUT, MAX_PACKET_SIZE_EP0);
+}
+
+void USBHAL::EP0readStage(void)
+{
+    // do nothing
+}
+
+uint32_t USBHAL::EP0getReadResult(uint8_t *buffer)
+{
+    uint32_t size;
+
+    if (MXC_USB->out_owner & 1) {
+        return 0;
+    }
+
+    // get the packet length and contents
+    ep_buffer_t *desc = get_desc(EP0OUT);
+    size = desc->buf0_desc;
+    memcpy(buffer, aligned_buffer[0], size);
+
+    return size;
+}
+
+void USBHAL::EP0write(uint8_t *buffer, uint32_t size)
+{
+    if ((size == 0) && (control_state != CTRL_IN)) {
+        // This is a status stage ACK. Handle in hardware.
+        MXC_USB->ep[0] |= MXC_F_USB_EP_ST_ACK;
+        control_state = CTRL_NONE;
+        return;
+    }
+
+    control_state = CTRL_IN;
+
+    endpointWrite(EP0IN, buffer, size);
+}
+
+void USBHAL::EP0stall(void)
+{
+    stallEndpoint(0);
+}
+
+EP_STATUS USBHAL::endpointRead(uint8_t endpoint, uint32_t maximumSize)
+{
+    uint8_t epnum = EP_NUM(endpoint);
+
+    if ((endpoint >= NUMBER_OF_PHYSICAL_ENDPOINTS) || IN_EP(endpoint)) {
+        return EP_INVALID;
+    }
+
+    if (maximumSize > MXC_USB_MAX_PACKET) {
+        return EP_INVALID;
+    }
+    
+    uint32_t mask = (1 << epnum);
+    if (MXC_USB->out_owner & mask) {
+        return EP_INVALID;
+    }
+
+    ep_buffer_t *desc = get_desc(endpoint);
+    desc->buf0_desc = maximumSize;
+    desc->buf0_address = (uint32_t)aligned_buffer[epnum];
+
+    MXC_USB->out_owner = mask;
+
+    return EP_PENDING;
+}
+
+EP_STATUS USBHAL::endpointReadResult(uint8_t endpoint, uint8_t *data, uint32_t *bytesRead)
+{
+    if ((endpoint >= NUMBER_OF_PHYSICAL_ENDPOINTS) || IN_EP(endpoint)) {
+        return EP_INVALID;
+    }
+
+    uint32_t mask = (1 << EP_NUM(endpoint));
+    if (MXC_USB->out_owner & mask) {
+        return EP_PENDING;
+    }
+
+    // get the packet length and contents
+    ep_buffer_t *desc = get_desc(endpoint);
+    *bytesRead = desc->buf0_desc;
+    memcpy(data, aligned_buffer[EP_NUM(endpoint)], *bytesRead);
+
+    return EP_COMPLETED;
+}
+
+EP_STATUS USBHAL::endpointWrite(uint8_t endpoint, uint8_t *data, uint32_t size)
+{
+    uint8_t epnum = EP_NUM(endpoint);
+
+    if ((endpoint >= NUMBER_OF_PHYSICAL_ENDPOINTS) || OUT_EP(endpoint)) {
+        return EP_INVALID;
+    }
+
+    if (size > MXC_USB_MAX_PACKET) {
+        return EP_INVALID;
+    }
+
+    uint32_t mask = (1 << epnum);
+    if (MXC_USB->in_owner & mask) {
+        return EP_INVALID;
+    }
+
+    memcpy(aligned_buffer[epnum], data, size);
+
+    ep_buffer_t *desc = get_desc(endpoint);
+    desc->buf0_desc = size;
+    desc->buf0_address = (uint32_t)aligned_buffer[epnum];
+
+    // start the DMA
+    MXC_USB->in_owner = mask;
+
+    return EP_PENDING;
+}
+
+EP_STATUS USBHAL::endpointWriteResult(uint8_t endpoint)
+{
+    uint32_t mask = (1 << EP_NUM(endpoint));
+    if (MXC_USB->in_owner & mask) {
+        return EP_PENDING;
+    }
+
+    return EP_COMPLETED;
+}
+
+void USBHAL::stallEndpoint(uint8_t endpoint)
+{
+    uint8_t epnum = EP_NUM(endpoint);
+
+    if (epnum == 0) {
+        MXC_USB->ep[epnum] |= MXC_F_USB_EP_ST_STALL;
+    }
+
+    MXC_USB->ep[epnum] |= MXC_F_USB_EP_STALL;
+}
+
+void USBHAL::unstallEndpoint(uint8_t endpoint)
+{
+    MXC_USB->ep[EP_NUM(endpoint)] &= ~MXC_F_USB_EP_STALL;
+}
+
+bool USBHAL::realiseEndpoint(uint8_t endpoint, uint32_t maxPacket, uint32_t options)
+{
+    uint8_t epnum = EP_NUM(endpoint);
+    uint32_t ep_ctrl;
+
+    if (epnum >= NUMBER_OF_PHYSICAL_ENDPOINTS) {
+        return false;
+    }
+
+    if (IN_EP(endpoint)) {
+        ep_ctrl = (MXC_V_USB_EP_DIR_IN << MXC_F_USB_EP_DIR_POS);
+    } else {
+        ep_ctrl = (MXC_S_USB_EP_DIR_OUT << MXC_F_USB_EP_DIR_POS);
+    }
+
+    ep_ctrl |= (MXC_F_USB_EP_DT | MXC_F_USB_EP_INT_EN);
+
+    MXC_USB->ep[epnum] = ep_ctrl;
+
+    return true;
+}
+
+bool USBHAL::getEndpointStallState(unsigned char endpoint)
+{
+    return !!(MXC_USB->ep[endpoint] & MXC_F_USB_EP_STALL);
+}
+
+void USBHAL::_usbisr(void)
+{
+    instance->usbisr();
+}
+
+void USBHAL::usbisr(void)
+{
+    // get and clear irqs
+    uint32_t irq_flags = MXC_USB->dev_intfl;
+    MXC_USB->dev_intfl = irq_flags;
+
+    // process only enabled interrupts
+    irq_flags &= MXC_USB->dev_inten;
+
+    // suspend 
+    if (irq_flags & MXC_F_USB_DEV_INTFL_SUSP) {
+        suspendStateChanged(1);
+    }
+
+    // bus reset
+    if (irq_flags & MXC_F_USB_DEV_INTFL_BRST) {
+
+        // reset endpoints
+        for (int i = 0; i < MXC_USB_NUM_EP; i++) {
+            // Disable endpoint and clear the data toggle
+            MXC_USB->ep[i] &= ~MXC_F_USB_EP_DIR;
+            MXC_USB->ep[i] |= MXC_F_USB_EP_DT;
+        }
+
+        // clear driver state
+        control_state = CTRL_NONE;
+
+        busReset();
+
+        // no need to process events after reset
+        return;
+    }
+
+    // Setup packet
+    if (irq_flags & MXC_F_USB_DEV_INTFL_SETUP) {
+        control_state = CTRL_SETUP;
+        EP0setupCallback();
+    }
+
+    // IN packets
+    if (irq_flags & MXC_F_USB_DEV_INTFL_EP_IN) {
+        // get and clear IN irqs
+        uint32_t in_irqs = MXC_USB->in_int;
+        MXC_USB->in_int = in_irqs;
+
+        if (in_irqs & 1) {
+            EP0in();
+        }
+
+        for (uint8_t epnum = 1; epnum < NUMBER_OF_LOGICAL_ENDPOINTS; epnum++) {
+            uint32_t irq_mask = (1 << epnum);
+            if (in_irqs & irq_mask) {
+                uint8_t endpoint = (epnum << 1) | DIR_IN;
+                (instance->*(epCallback[endpoint]))();
+            }
+        }
+    }
+
+    // OUT packets
+    if (irq_flags & MXC_F_USB_DEV_INTFL_EP_OUT) {
+        // get and clear OUT irqs
+        uint32_t out_irqs = MXC_USB->out_int;
+        MXC_USB->out_int = out_irqs;
+
+        if (out_irqs & 1) {
+            EP0out();
+        }
+
+        for (uint8_t epnum = 1; epnum < NUMBER_OF_LOGICAL_ENDPOINTS; epnum++) {
+            uint32_t irq_mask = (1 << epnum);
+            if (out_irqs & irq_mask) {
+                uint8_t endpoint = (epnum << 1) | DIR_OUT;
+                (instance->*(epCallback[endpoint]))();
+            }
+        }
+    }
+}
+
+#endif