minix/drivers/usbd/hcd/musb/musb_core.c
2014-07-28 17:05:54 +02:00

914 lines
26 KiB
C
Executable file

/*
* Implementation of low level MUSB core logic (variant independent)
*/
#include <string.h> /* memcpy */
#include <usb/hcd_common.h>
#include <usb/hcd_interface.h>
#include <usb/usb_common.h>
#include "musb_core.h"
#include "musb_regs.h"
/*===========================================================================*
* Local prototypes *
*===========================================================================*/
static void musb_set_state(musb_core_config *);
static int musb_check_rxpktrdy(void *, hcd_reg1);
static void musb_in_stage_cleanup(void *, hcd_reg1);
static void musb_clear_rxpktrdy(void *, hcd_reg1);
static void musb_clear_statuspkt(void *);
static int musb_get_count(void *);
static void musb_read_fifo(void *, void *, int, hcd_reg1);
static void musb_write_fifo(void *, void *, int, hcd_reg1);
/*===========================================================================*
* *
* MUSB core implementation *
* *
*===========================================================================*/
/*===========================================================================*
* musb_set_state *
*===========================================================================*/
static void
musb_set_state(musb_core_config * cfg)
{
void * r;
DEBUG_DUMP;
r = cfg->regs;
USB_ASSERT(cfg->ep <= HCD_LAST_EP, "Invalid EP supplied");
USB_ASSERT(cfg->addr <= HCD_LAST_ADDR, "Invalid address supplied");
/* Set EP and address to be used in next MUSB command */
/* Set EP by selecting INDEX */
HCD_WR1(r, MUSB_REG_INDEX, cfg->ep);
/* Use device with address 'cfg->addr' */
HCD_WR1(r, MUSB_REG_FADDR, cfg->addr);
HCD_WR2(r, MUSB_REG_CONFIG(cfg->ep, MUSB_REG_RXFUNCADDR), cfg->addr);
HCD_WR2(r, MUSB_REG_CONFIG(cfg->ep, MUSB_REG_TXFUNCADDR), cfg->addr);
}
/*===========================================================================*
* musb_check_rxpktrdy *
*===========================================================================*/
static int
musb_check_rxpktrdy(void * cfg, hcd_reg1 ep_num)
{
void * r;
DEBUG_DUMP;
r = ((musb_core_config *)cfg)->regs;
/* Set EP and device address to be used in this command */
musb_set_state((musb_core_config *)cfg);
/* Check for RXPKTRDY */
if (HCD_DEFAULT_EP == ep_num) {
/* Get control status register for EP 0 */
if (HCD_RD2(r, MUSB_REG_HOST_CSR0) &
MUSB_VAL_HOST_CSR0_RXPKTRDY)
return EXIT_SUCCESS;
} else {
/* Get RX status register for any other EP */
if (HCD_RD2(r, MUSB_REG_HOST_RXCSR) &
MUSB_VAL_HOST_RXCSR_RXPKTRDY)
return EXIT_SUCCESS;
}
return EXIT_FAILURE;
}
/*===========================================================================*
* musb_in_stage_cleanup *
*===========================================================================*/
static void
musb_in_stage_cleanup(void * cfg, hcd_reg1 ep_num)
{
DEBUG_DUMP;
musb_clear_rxpktrdy(cfg, ep_num);
/* For control EP 0 also clear STATUSPKT */
if (HCD_DEFAULT_EP == ep_num)
musb_clear_statuspkt(cfg);
}
/*===========================================================================*
* musb_clear_rxpktrdy *
*===========================================================================*/
static void
musb_clear_rxpktrdy(void * cfg, hcd_reg1 ep_num)
{
void * r;
hcd_reg2 host_csr;
DEBUG_DUMP;
r = ((musb_core_config *)cfg)->regs;
/* Set EP and device address to be used in this command */
musb_set_state((musb_core_config *)cfg);
/* Check for RXPKTRDY */
if (HCD_DEFAULT_EP == ep_num) {
/* Get control status register for EP 0 */
host_csr = HCD_RD2(r, MUSB_REG_HOST_CSR0);
/* Clear RXPKTRDY to signal receive completion */
HCD_CLR(host_csr, MUSB_VAL_HOST_CSR0_RXPKTRDY);
HCD_WR2(r, MUSB_REG_HOST_CSR0, host_csr);
} else {
/* Get RX status register for any other EP */
host_csr = HCD_RD2(r, MUSB_REG_HOST_RXCSR);
/* Clear RXPKTRDY to signal receive completion */
HCD_CLR(host_csr, MUSB_VAL_HOST_RXCSR_RXPKTRDY);
HCD_WR2(r, MUSB_REG_HOST_RXCSR, host_csr);
}
}
/*===========================================================================*
* musb_clear_statuspkt *
*===========================================================================*/
static void
musb_clear_statuspkt(void * cfg)
{
void * r;
hcd_reg2 host_csr0;
DEBUG_DUMP;
r = ((musb_core_config *)cfg)->regs;
/* Set EP and device address to be used in this command */
musb_set_state((musb_core_config *)cfg);
/* Get control status register for EP 0 */
host_csr0 = HCD_RD2(r, MUSB_REG_HOST_CSR0);
/* Clear STATUSPKT to signal status packet completion */
HCD_CLR(host_csr0, MUSB_VAL_HOST_CSR0_STATUSPKT);
HCD_WR2(r, MUSB_REG_HOST_CSR0, host_csr0);
}
/*===========================================================================*
* musb_get_count *
*===========================================================================*/
static int
musb_get_count(void * cfg)
{
void * r;
DEBUG_DUMP;
r = ((musb_core_config *)cfg)->regs;
/* Set EP and device address to be used in this command */
musb_set_state((musb_core_config *)cfg);
/* Reserved part returns zero so no need to generalize
* this return for MUSB_REG_RXCOUNT */
return (int)(HCD_RD2(r, MUSB_REG_COUNT0));
}
/*===========================================================================*
* musb_read_fifo *
*===========================================================================*/
static void
musb_read_fifo(void * cfg, void * output, int size, hcd_reg1 fifo_num)
{
void * r;
hcd_reg1 * output_b;
hcd_reg4 * output_w;
hcd_addr fifo_addr;
DEBUG_DUMP;
USB_ASSERT(fifo_num <= HCD_LAST_EP, "Invalid FIFO number");
r = ((musb_core_config *)cfg)->regs;
fifo_addr = MUSB_REG_FIFO0 + (fifo_num * MUSB_REG_FIFO_LEN);
/* TODO: Apparently, FIFO can only be read by:
* 1. initially using words
* 2. using bytes for whatever remains
* Reading bytes first to achieve alignment of remaining data
* will for some reason disable further word based reading
* Such reading method, may not be optimal for unaligned data */
output_w = (hcd_reg4 *)output;
/* Try and copy aligned words */
if (0 == ((hcd_addr)output_w % sizeof(hcd_addr))) {
while (size > (int)(sizeof(*output_w) - 1)) {
*output_w++ = HCD_RD4(r, fifo_addr);
size -= sizeof(*output_w);
}
}
output_b = (hcd_reg1 *)output_w;
/* Then, go with remaining bytes */
while (size > 0) {
*output_b++ = HCD_RD1(r, fifo_addr);
size--;
}
}
/*===========================================================================*
* musb_write_fifo *
*===========================================================================*/
static void
musb_write_fifo(void * cfg, void * input, int size, hcd_reg1 fifo_num)
{
void * r;
hcd_reg1 * input_b;
hcd_reg4 * input_w;
hcd_addr fifo_addr;
DEBUG_DUMP;
USB_ASSERT(fifo_num <= HCD_LAST_EP, "Invalid FIFO number");
r = ((musb_core_config *)cfg)->regs;
fifo_addr = MUSB_REG_FIFO0 + (fifo_num * MUSB_REG_FIFO_LEN);
/* TODO: Apparently, FIFO can only be written by:
* 1. initially using words
* 2. using bytes for whatever remains
* Writing bytes first to achieve alignment of remaining data
* will for some reason disable further word based writing
* Such writing method, may not be optimal for unaligned data */
input_w = (hcd_reg4 *)input;
/* Try and copy aligned words */
if (0 == ((hcd_addr)input_w % sizeof(hcd_addr))) {
while (size > (int)(sizeof(*input_w) - 1)) {
HCD_WR4(r, fifo_addr, *input_w++);
size -= sizeof(*input_w);
}
}
input_b = (hcd_reg1 *)input_w;
/* Then, go with remaining bytes */
while (size > 0) {
HCD_WR1(r, fifo_addr, *input_b++);
size--;
}
}
/*===========================================================================*
* musb_core_start *
*===========================================================================*/
void
musb_core_start(void * cfg)
{
void * r;
hcd_reg1 devctl;
DEBUG_DUMP;
r = ((musb_core_config *)cfg)->regs;
/* Enable all interrupts valid for host */
HCD_WR1(r, MUSB_REG_INTRUSBE,
MUSB_VAL_INTRUSBE_SUSPEND |
MUSB_VAL_INTRUSBE_RESUME |
MUSB_VAL_INTRUSBE_RESET_BABBLE |
/* MUSB_VAL_INTRUSBE_SOF | */
MUSB_VAL_INTRUSBE_CONN |
MUSB_VAL_INTRUSBE_DISCON |
MUSB_VAL_INTRUSBE_SESSREQ |
MUSB_VAL_INTRUSBE_VBUSERR);
/* Start session */
devctl = HCD_RD1(r, MUSB_REG_DEVCTL);
HCD_SET(devctl, MUSB_VAL_DEVCTL_SESSION);
HCD_WR1(r, MUSB_REG_DEVCTL, devctl);
}
/*===========================================================================*
* musb_core_stop *
*===========================================================================*/
void
musb_core_stop(void * cfg)
{
void * r;
hcd_reg1 devctl;
DEBUG_DUMP;
r = ((musb_core_config *)cfg)->regs;
/* Disable all interrupts */
HCD_WR1(r, MUSB_REG_INTRUSBE, MUSB_VAL_INTRUSBE_NONE);
/* Stop session */
devctl = HCD_RD1(r, MUSB_REG_DEVCTL);
HCD_CLR(devctl, MUSB_VAL_DEVCTL_SESSION);
HCD_WR1(r, MUSB_REG_DEVCTL, devctl);
}
/*===========================================================================*
* *
* HCD interface implementation *
* *
*===========================================================================*/
/*===========================================================================*
* musb_setup_device *
*===========================================================================*/
void
musb_setup_device(void * cfg, hcd_reg1 ep, hcd_reg1 addr)
{
DEBUG_DUMP;
/* Assign */
((musb_core_config *)cfg)->ep = ep;
((musb_core_config *)cfg)->addr = addr;
}
/*===========================================================================*
* musb_reset_device *
*===========================================================================*/
int
musb_reset_device(void * cfg, hcd_speed * speed)
{
void * r;
musb_core_config * core;
hcd_reg1 power;
hcd_reg1 host_type0;
DEBUG_DUMP;
core = (musb_core_config *)cfg;
r = core->regs;
/* Set initial parameters */
musb_setup_device(core, HCD_DEFAULT_EP, HCD_DEFAULT_ADDR);
/* Set EP and device address to be used in this command */
musb_set_state(core);
/* Write reset bit and high speed negotiation wait for at least
* 20ms for reset, clear reset bit and wait for device */
power = HCD_RD1(r, MUSB_REG_POWER);
HCD_SET(power, MUSB_VAL_POWER_RESET | MUSB_VAL_POWER_HSEN);
HCD_WR1(r, MUSB_REG_POWER, power);
/* Sleep 25msec */
hcd_os_nanosleep(HCD_NANOSLEEP_MSEC(25));
power = HCD_RD1(r, MUSB_REG_POWER);
HCD_CLR(power, MUSB_VAL_POWER_RESET);
HCD_WR1(r, MUSB_REG_POWER, power);
/* Sleep 25msec */
hcd_os_nanosleep(HCD_NANOSLEEP_MSEC(25));
/* High speed check */
power = HCD_RD1(r, MUSB_REG_POWER);
if (power & MUSB_VAL_POWER_HSMODE) {
/* Set high-speed for EP0 */
host_type0 = HCD_RD1(r, MUSB_REG_HOST_TYPE0);
HCD_CLR(host_type0, MUSB_VAL_HOST_TYPE0_MASK);
HCD_SET(host_type0, MUSB_VAL_HOST_TYPE0_HIGH_SPEED);
HCD_WR1(r, MUSB_REG_HOST_TYPE0, host_type0);
*speed = HCD_SPEED_HIGH;
USB_DBG("High speed USB enabled");
} else {
/* Only full-speed supported */
USB_DBG("High speed USB disabled");
*speed = HCD_SPEED_FULL;
}
return EXIT_SUCCESS;
}
/*===========================================================================*
* musb_setup_stage *
*===========================================================================*/
void
musb_setup_stage(void * cfg, hcd_ctrlrequest * setup)
{
void * r;
char * setup_byte;
musb_core_config * core;
hcd_reg2 host_csr0;
DEBUG_DUMP;
core = (musb_core_config *)cfg;
r = core->regs;
setup_byte = (char*)setup;
USB_ASSERT(0 == core->ep, "Only EP 0 can handle control transfers");
/* Set EP and device address to be used in this command */
musb_set_state(core);
/* Put USB setup data into EP0 FIFO */
HCD_WR4(r, MUSB_REG_FIFO0, HCD_8TO32(&setup_byte[0]));
HCD_WR4(r, MUSB_REG_FIFO0, HCD_8TO32(&setup_byte[sizeof(hcd_reg4)]));
/* Get control status register for EP 0 */
host_csr0 = HCD_RD2(r, MUSB_REG_HOST_CSR0);
/* Send actual packet from FIFO */
HCD_SET(host_csr0, MUSB_VAL_HOST_CSR0_TXPKTRDY |
MUSB_VAL_HOST_CSR0_SETUPPKT);
HCD_WR2(r, MUSB_REG_HOST_CSR0, host_csr0);
}
/*===========================================================================*
* musb_rx_stage *
*===========================================================================*/
void
musb_rx_stage(void * cfg, hcd_datarequest * request)
{
musb_core_config * core;
hcd_reg2 host_rxcsr;
hcd_reg1 host_rxtype;
void * r;
DEBUG_DUMP;
core = (musb_core_config *)cfg;
r = core->regs;
USB_ASSERT(request->max_packet_size <= HCD_MAX_MAXPACKETSIZE,
"Invalid wMaxPacketSize");
USB_ASSERT((core->ep <= HCD_LAST_EP) && (core->ep > HCD_DEFAULT_EP),
"Invalid bulk EP supplied");
/* Set EP and device address to be used in this command */
musb_set_state(core);
/* Evaluate RXTYPE */
host_rxtype = core->ep;
switch (request->type) {
case HCD_TRANSFER_BULK:
host_rxtype |= MUSB_VAL_HOST_XXTYPE_BULK;
break;
case HCD_TRANSFER_INTERRUPT:
host_rxtype |= MUSB_VAL_HOST_XXTYPE_INTERRUPT;
break;
default:
USB_ASSERT(0, "Unsupported transfer type");
}
if (HCD_SPEED_HIGH == request->speed)
host_rxtype |= MUSB_VAL_HOST_XXTYPE_HIGH_SPEED;
else
host_rxtype |= MUSB_VAL_HOST_XXTYPE_FULL_SPEED;
/* Rewrite HOST_RXTYPE */
HCD_WR1(r, MUSB_REG_HOST_RXTYPE, host_rxtype);
/* Rewrite RXMAXP */
HCD_WR2(r, MUSB_REG_RXMAXP, request->max_packet_size);
/* Set HOST_RXINTERVAL (which means interval or NAK limit) */
HCD_WR1(r, MUSB_REG_HOST_RXINTERVAL, request->interval);
#if 0
{
/* Not required by all MUSB implementations, but
* left here just in case */
hcd_reg2 intrrxe;
/* Enable this interrupt */
intrrxe = HCD_RD2(r, MUSB_REG_INTRRXE);
HCD_SET(intrrxe, HCD_BIT(core->ep));
HCD_WR2(r, MUSB_REG_INTRRXE, intrrxe);
}
#endif
/* TODO: One reusable FIFO, no double buffering */
/* TODO: With this, only one device/EP can work at a time. Should this
* be changed, hcd_device_wait/hcd_device_continue calls must be fixed
* accordingly to allow handling multiple EP interrupts */
/* Assign FIFO */
HCD_WR2(r, MUSB_REG_RXFIFOADDR, MUSB_VAL_XXFIFOADDR_EP0_END);
HCD_WR1(r, MUSB_REG_RXFIFOSZ, MUSB_VAL_XXFIFOSZ_4096);
/* Make controller reconfigure */
host_rxcsr = HCD_RD2(r, MUSB_REG_HOST_RXCSR);
if (MUSB_DATATOG_UNKNOWN == core->datatog_rx[core->ep]) {
/* Reset DATA toggle on first transfer */
HCD_SET(host_rxcsr, MUSB_VAL_HOST_RXCSR_CLRDATATOG);
core->datatog_rx[core->ep] = MUSB_DATATOG_INIT;
}
HCD_SET(host_rxcsr, MUSB_VAL_HOST_RXCSR_FLUSHFIFO);
HCD_WR2(r, MUSB_REG_HOST_RXCSR, host_rxcsr);
/* Request packet */
host_rxcsr = HCD_RD2(r, MUSB_REG_HOST_RXCSR);
HCD_SET(host_rxcsr, MUSB_VAL_HOST_RXCSR_REQPKT);
HCD_WR2(r, MUSB_REG_HOST_RXCSR, host_rxcsr);
}
/*===========================================================================*
* musb_tx_stage *
*===========================================================================*/
void
musb_tx_stage(void * cfg, hcd_datarequest * request)
{
musb_core_config * core;
hcd_reg2 host_txcsr;
hcd_reg1 host_txtype;
void * r;
DEBUG_DUMP;
core = (musb_core_config *)cfg;
r = core->regs;
USB_ASSERT(request->max_packet_size <= HCD_MAX_MAXPACKETSIZE,
"Invalid wMaxPacketSize");
USB_ASSERT((core->ep <= HCD_LAST_EP) && (core->ep > HCD_DEFAULT_EP),
"Invalid bulk EP supplied");
/* Set EP and device address to be used in this command */
musb_set_state(core);
/* Evaluate TXTYPE */
host_txtype = core->ep;
switch (request->type) {
case HCD_TRANSFER_BULK:
host_txtype |= MUSB_VAL_HOST_XXTYPE_BULK;
break;
case HCD_TRANSFER_INTERRUPT:
host_txtype |= MUSB_VAL_HOST_XXTYPE_INTERRUPT;
break;
default:
USB_ASSERT(0, "Unsupported transfer type");
}
if (HCD_SPEED_HIGH == request->speed)
host_txtype |= MUSB_VAL_HOST_XXTYPE_HIGH_SPEED;
else
host_txtype |= MUSB_VAL_HOST_XXTYPE_FULL_SPEED;
/* Rewrite HOST_TXTYPE */
HCD_WR1(r, MUSB_REG_HOST_TXTYPE, host_txtype);
/* Rewrite TXMAXP */
HCD_WR2(r, MUSB_REG_TXMAXP, request->max_packet_size);
/* Set HOST_TXINTERVAL (which means interval or NAK limit) */
HCD_WR1(r, MUSB_REG_HOST_TXINTERVAL, request->interval);
#if 0
{
/* Not required by all MUSB implementations, but
* left here just in case */
hcd_reg2 intrtxe;
/* Enable this interrupt */
intrtxe = HCD_RD2(r, MUSB_REG_INTRTXE);
HCD_SET(intrtxe, HCD_BIT(core->ep));
HCD_WR2(r, MUSB_REG_INTRTXE, intrtxe);
}
#endif
/* TODO: One reusable FIFO, no double buffering */
/* TODO: With this, only one device/EP can work at a time. Should this
* be changed, hcd_device_wait/hcd_device_continue calls must be fixed
* accordingly to allow handling multiple EP interrupts */
/* Assign FIFO */
HCD_WR2(r, MUSB_REG_TXFIFOADDR, MUSB_VAL_XXFIFOADDR_EP0_END);
HCD_WR1(r, MUSB_REG_TXFIFOSZ, MUSB_VAL_XXFIFOSZ_4096);
/* Make controller reconfigure */
host_txcsr = HCD_RD2(r, MUSB_REG_HOST_TXCSR);
HCD_CLR(host_txcsr, MUSB_VAL_HOST_TXCSR_DMAMODE);
HCD_CLR(host_txcsr, MUSB_VAL_HOST_TXCSR_FRCDATATOG);
HCD_CLR(host_txcsr, MUSB_VAL_HOST_TXCSR_DMAEN);
HCD_SET(host_txcsr, MUSB_VAL_HOST_TXCSR_MODE);
HCD_CLR(host_txcsr, MUSB_VAL_HOST_TXCSR_ISO);
HCD_CLR(host_txcsr, MUSB_VAL_HOST_TXCSR_AUTOSET);
if (MUSB_DATATOG_UNKNOWN == core->datatog_tx[core->ep]) {
/* Reset DATA toggle on first transfer */
HCD_SET(host_txcsr, MUSB_VAL_HOST_TXCSR_CLRDATATOG);
core->datatog_tx[core->ep] = MUSB_DATATOG_INIT;
}
HCD_SET(host_txcsr, MUSB_VAL_HOST_TXCSR_FLUSHFIFO);
HCD_WR2(r, MUSB_REG_HOST_TXCSR, host_txcsr);
/* Put data in FIFO */
musb_write_fifo(cfg, request->data, request->data_left, core->ep);
/* Request packet */
host_txcsr = HCD_RD2(r, MUSB_REG_HOST_TXCSR);
HCD_SET(host_txcsr, MUSB_VAL_HOST_TXCSR_TXPKTRDY);
HCD_WR2(r, MUSB_REG_HOST_TXCSR, host_txcsr);
}
/*===========================================================================*
* musb_in_data_stage *
*===========================================================================*/
void
musb_in_data_stage(void * cfg)
{
void * r;
hcd_reg2 host_csr0;
DEBUG_DUMP;
r = ((musb_core_config *)cfg)->regs;
/* Set EP and device address to be used in this command */
musb_set_state((musb_core_config *)cfg);
/* Get control status register for EP 0 */
host_csr0 = HCD_RD2(r, MUSB_REG_HOST_CSR0);
/* Request IN DATA stage */
HCD_SET(host_csr0, MUSB_VAL_HOST_CSR0_REQPKT);
HCD_WR2(r, MUSB_REG_HOST_CSR0, host_csr0);
}
/*===========================================================================*
* musb_out_data_stage *
*===========================================================================*/
void
musb_out_data_stage(void * cfg)
{
DEBUG_DUMP;
/* Set EP and device address to be used in this command */
musb_set_state((musb_core_config *)cfg);
/* TODO: Not needed for enumeration but may be needed later, if
* additional control transfers are implemented */
USB_ASSERT(0, "Setup packet's 'DATA OUT' stage not implemented");
}
/*===========================================================================*
* musb_in_status_stage *
*===========================================================================*/
void
musb_in_status_stage(void * cfg)
{
void * r;
hcd_reg2 host_csr0;
DEBUG_DUMP;
r = ((musb_core_config *)cfg)->regs;
/* Set EP and device address to be used in this command */
musb_set_state((musb_core_config *)cfg);
/* Get control status register for EP 0 */
host_csr0 = HCD_RD2(r, MUSB_REG_HOST_CSR0);
/* Request IN STATUS stage */
HCD_SET(host_csr0, MUSB_VAL_HOST_CSR0_REQPKT |
MUSB_VAL_HOST_CSR0_STATUSPKT);
HCD_WR2(r, MUSB_REG_HOST_CSR0, host_csr0);
}
/*===========================================================================*
* musb_out_status_stage *
*===========================================================================*/
void
musb_out_status_stage(void * cfg)
{
void * r;
hcd_reg2 host_csr0;
DEBUG_DUMP;
r = ((musb_core_config *)cfg)->regs;
/* Set EP and device address to be used in this command */
musb_set_state((musb_core_config *)cfg);
/* Get control status register for EP 0 */
host_csr0 = HCD_RD2(r, MUSB_REG_HOST_CSR0);
/* Request OUT STATUS stage */
HCD_SET(host_csr0, MUSB_VAL_HOST_CSR0_TXPKTRDY |
MUSB_VAL_HOST_CSR0_STATUSPKT);
HCD_WR2(r, MUSB_REG_HOST_CSR0, host_csr0);
}
/*===========================================================================*
* musb_read_data *
*===========================================================================*/
int
musb_read_data(void * cfg, hcd_reg1 * buffer, hcd_reg1 ep_num)
{
int count;
DEBUG_DUMP;
/* Check if anything received at all */
if (EXIT_SUCCESS != musb_check_rxpktrdy(cfg, ep_num)) {
USB_MSG("RXPKTRDY not set when receiving");
return HCD_READ_ERR;
}
/* Number of bytes received at any EP */
count = musb_get_count(cfg);
/* Read from given FIFO */
if ((NULL != buffer) && (count > 0))
musb_read_fifo(cfg, buffer, count, ep_num);
/* Cleanup after reading */
musb_in_stage_cleanup(cfg, ep_num);
return count;
}
/*===========================================================================*
* musb_check_error *
*===========================================================================*/
int
musb_check_error(void * cfg, hcd_transfer xfer, hcd_reg1 ep, hcd_direction dir)
{
/* Possible error handling schemes for MUSB */
typedef enum {
MUSB_INVALID_ERROR_CASE,
MUSB_EP0_ERROR_CASE,
MUSB_OUT_ERROR_CASE,
MUSB_IN_ERROR_CASE,
}
musb_error_case;
void * r;
hcd_reg2 host_csr;
musb_error_case error_case;
DEBUG_DUMP;
/* TODO: ISO transfer */
USB_ASSERT(HCD_TRANSFER_ISOCHRONOUS != xfer,
"ISO transfer not supported");
r = ((musb_core_config *)cfg)->regs;
/* Set EP and device address to be used in this command */
musb_set_state((musb_core_config *)cfg);
/* Resolve which error needs to be checked
* so we can use proper MUSB registers */
error_case = MUSB_INVALID_ERROR_CASE;
if (HCD_DEFAULT_EP == ep) {
if (HCD_TRANSFER_CONTROL == xfer)
/* EP0, control, any direction */
error_case = MUSB_EP0_ERROR_CASE;
} else {
if (HCD_TRANSFER_CONTROL != xfer) {
if (HCD_DIRECTION_OUT == dir)
/* EP>0, non-control, out */
error_case = MUSB_OUT_ERROR_CASE;
else if (HCD_DIRECTION_IN == dir)
/* EP>0, non-control, in */
error_case = MUSB_IN_ERROR_CASE;
}
}
/* In MUSB, EP0 has it's own registers for error handling and it also
* seems to be the only way to handle errors for control transfers */
if (MUSB_EP0_ERROR_CASE == error_case) {
/* Get control status register */
host_csr = HCD_RD2(r, MUSB_REG_HOST_CSR0);
/* Check for common errors */
if (host_csr & MUSB_VAL_HOST_CSR0_ERROR) {
USB_MSG("HOST_CSR0 ERROR: %04X", host_csr);
HCD_CLR(host_csr, MUSB_VAL_HOST_CSR0_ERROR);
HCD_WR2(r, MUSB_REG_HOST_CSR0, host_csr);
return EXIT_FAILURE;
}
if (host_csr & MUSB_VAL_HOST_CSR0_RXSTALL) {
USB_MSG("HOST_CSR0 STALL: %04X", host_csr);
HCD_CLR(host_csr, MUSB_VAL_HOST_CSR0_RXSTALL);
HCD_WR2(r, MUSB_REG_HOST_CSR0, host_csr);
return EXIT_FAILURE;
}
if (host_csr & MUSB_VAL_HOST_CSR0_NAK_TIMEOUT) {
USB_MSG("HOST_CSR0 NAK_TIMEOUT: %04X", host_csr);
HCD_CLR(host_csr, MUSB_VAL_HOST_CSR0_NAK_TIMEOUT);
HCD_WR2(r, MUSB_REG_HOST_CSR0, host_csr);
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
if (MUSB_OUT_ERROR_CASE == error_case) {
/* Get TX status register */
host_csr = HCD_RD2(r, MUSB_REG_HOST_TXCSR);
/* Check for common errors */
if (host_csr & MUSB_VAL_HOST_TXCSR_ERROR) {
USB_MSG("HOST_TXCSR ERROR: %04X", host_csr);
HCD_CLR(host_csr, MUSB_VAL_HOST_TXCSR_ERROR);
HCD_WR2(r, MUSB_REG_HOST_TXCSR, host_csr);
return EXIT_FAILURE;
}
if (host_csr & MUSB_VAL_HOST_TXCSR_RXSTALL) {
USB_MSG("HOST_TXCSR STALL: %04X", host_csr);
HCD_CLR(host_csr, MUSB_VAL_HOST_TXCSR_RXSTALL);
HCD_WR2(r, MUSB_REG_HOST_TXCSR, host_csr);
return EXIT_FAILURE;
}
if (host_csr & MUSB_VAL_HOST_TXCSR_NAK_TIMEOUT) {
USB_MSG("HOST_TXCSR NAK_TIMEOUT: %04X", host_csr);
HCD_CLR(host_csr, MUSB_VAL_HOST_TXCSR_NAK_TIMEOUT);
HCD_WR2(r, MUSB_REG_HOST_TXCSR, host_csr);
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
if (MUSB_IN_ERROR_CASE == error_case) {
/* Get RX status register */
host_csr = HCD_RD2(r, MUSB_REG_HOST_RXCSR);
/* Check for common errors */
if (host_csr & MUSB_VAL_HOST_RXCSR_ERROR) {
USB_MSG("HOST_RXCSR ERROR: %04X", host_csr);
HCD_CLR(host_csr, MUSB_VAL_HOST_RXCSR_ERROR);
HCD_WR2(r, MUSB_REG_HOST_RXCSR, host_csr);
return EXIT_FAILURE;
}
if (host_csr & MUSB_VAL_HOST_RXCSR_RXSTALL) {
USB_MSG("HOST_RXCSR STALL: %04X", host_csr);
HCD_CLR(host_csr, MUSB_VAL_HOST_RXCSR_RXSTALL);
HCD_WR2(r, MUSB_REG_HOST_RXCSR, host_csr);
return EXIT_FAILURE;
}
if (host_csr & MUSB_VAL_HOST_RXCSR_NAKTIMEOUT) {
USB_MSG("HOST_RXCSR NAK_TIMEOUT: %04X", host_csr);
HCD_CLR(host_csr, MUSB_VAL_HOST_RXCSR_NAKTIMEOUT);
HCD_WR2(r, MUSB_REG_HOST_RXCSR, host_csr);
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
USB_MSG("Invalid USB transfer error check: 0x%X, 0x%X, 0x%X",
(int)xfer, (int)ep, (int)dir);
return EXIT_FAILURE;
}