#define MAX_TRANSFER_BYTES ((1<<19)-1) /* The low level hardware can transfer a maximum of this number of bytes in each transfer. The field is 19 bits wide */
#define MAX_TRANSFER_PACKETS ((1<<10)-1) /* The low level hardware can transfer a maximum of this number of packets in each transfer. The field is 10 bits wide */
-/* These defines disable the normal read and write csr. This is so I can add
- extra debug stuff to the usb specific version and I won't use the normal
- version by mistake */
+/*
+ * These defines disable the normal read and write csr. This is so I can add
+ * extra debug stuff to the usb specific version and I won't use the normal
+ * version by mistake
+ */
#define cvmx_read_csr use_cvmx_usb_read_csr64_instead_of_cvmx_read_csr
#define cvmx_write_csr use_cvmx_usb_write_csr64_instead_of_cvmx_write_csr
} while (0); \
result; })
-/* This macro logically sets a single field in a CSR. It does the sequence
- read, modify, and write */
+/*
+ * This macro logically sets a single field in a CSR. It does the sequence
+ * read, modify, and write
+ */
#define USB_SET_FIELD32(address, type, field, value) \
do { \
type c; \
__cvmx_usb_append_pipe(&usb->free_pipes, usb->pipe + i);
}
- /* Power On Reset and PHY Initialization */
-
- /* 1. Wait for DCOK to assert (nothing to do) */
- /* 2a. Write USBN0/1_CLK_CTL[POR] = 1 and
- USBN0/1_CLK_CTL[HRST,PRST,HCLK_RST] = 0 */
+ /*
+ * Power On Reset and PHY Initialization
+ *
+ * 1. Wait for DCOK to assert (nothing to do)
+ *
+ * 2a. Write USBN0/1_CLK_CTL[POR] = 1 and
+ * USBN0/1_CLK_CTL[HRST,PRST,HCLK_RST] = 0
+ */
usbn_clk_ctl.u64 = __cvmx_usb_read_csr64(usb, CVMX_USBNX_CLK_CTL(usb->index));
usbn_clk_ctl.s.por = 1;
usbn_clk_ctl.s.hrst = 0;
usbn_clk_ctl.s.prst = 0;
usbn_clk_ctl.s.hclk_rst = 0;
usbn_clk_ctl.s.enable = 0;
- /* 2b. Select the USB reference clock/crystal parameters by writing
- appropriate values to USBN0/1_CLK_CTL[P_C_SEL, P_RTYPE, P_COM_ON] */
+ /*
+ * 2b. Select the USB reference clock/crystal parameters by writing
+ * appropriate values to USBN0/1_CLK_CTL[P_C_SEL, P_RTYPE, P_COM_ON]
+ */
if (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_CLOCK_XO_GND) {
- /* The USB port uses 12/24/48MHz 2.5V board clock
- source at USB_XO. USB_XI should be tied to GND.
- Most Octeon evaluation boards require this setting */
+ /*
+ * The USB port uses 12/24/48MHz 2.5V board clock
+ * source at USB_XO. USB_XI should be tied to GND.
+ * Most Octeon evaluation boards require this setting
+ */
if (OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
usbn_clk_ctl.cn31xx.p_rclk = 1; /* From CN31XX,CN30XX manual */
usbn_clk_ctl.cn31xx.p_xenbn = 0;
break;
}
} else {
- /* The USB port uses a 12MHz crystal as clock source
- at USB_XO and USB_XI */
+ /*
+ * The USB port uses a 12MHz crystal as clock source
+ * at USB_XO and USB_XI
+ */
if (OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
usbn_clk_ctl.cn31xx.p_rclk = 1; /* From CN31XX,CN30XX manual */
usbn_clk_ctl.cn31xx.p_xenbn = 1;
usbn_clk_ctl.s.p_c_sel = 0;
}
- /* 2c. Select the HCLK via writing USBN0/1_CLK_CTL[DIVIDE, DIVIDE2] and
- setting USBN0/1_CLK_CTL[ENABLE] = 1. Divide the core clock down such
- that USB is as close as possible to 125Mhz */
+ /*
+ * 2c. Select the HCLK via writing USBN0/1_CLK_CTL[DIVIDE, DIVIDE2] and
+ * setting USBN0/1_CLK_CTL[ENABLE] = 1. Divide the core clock down
+ * such that USB is as close as possible to 125Mhz
+ */
{
int divisor = (octeon_get_clock_rate()+125000000-1)/125000000;
if (divisor < 4) /* Lower than 4 doesn't seem to work properly */
usbn_clk_ctl.u64);
/* 2e. Wait 64 core-clock cycles for HCLK to stabilize */
cvmx_wait(64);
- /* 3. Program the power-on reset field in the USBN clock-control register:
- USBN_CLK_CTL[POR] = 0 */
+ /*
+ * 3. Program the power-on reset field in the USBN clock-control
+ * register:
+ * USBN_CLK_CTL[POR] = 0
+ */
usbn_clk_ctl.s.por = 0;
__cvmx_usb_write_csr64(usb, CVMX_USBNX_CLK_CTL(usb->index),
usbn_clk_ctl.u64);
/* 4. Wait 1 ms for PHY clock to start */
mdelay(1);
- /* 5. Program the Reset input from automatic test equipment field in the
- USBP control and status register: USBN_USBP_CTL_STATUS[ATE_RESET] = 1 */
+ /*
+ * 5. Program the Reset input from automatic test equipment field in the
+ * USBP control and status register:
+ * USBN_USBP_CTL_STATUS[ATE_RESET] = 1
+ */
usbn_usbp_ctl_status.u64 = __cvmx_usb_read_csr64(usb, CVMX_USBNX_USBP_CTL_STATUS(usb->index));
usbn_usbp_ctl_status.s.ate_reset = 1;
__cvmx_usb_write_csr64(usb, CVMX_USBNX_USBP_CTL_STATUS(usb->index),
usbn_usbp_ctl_status.u64);
/* 6. Wait 10 cycles */
cvmx_wait(10);
- /* 7. Clear ATE_RESET field in the USBN clock-control register:
- USBN_USBP_CTL_STATUS[ATE_RESET] = 0 */
+ /*
+ * 7. Clear ATE_RESET field in the USBN clock-control register:
+ * USBN_USBP_CTL_STATUS[ATE_RESET] = 0
+ */
usbn_usbp_ctl_status.s.ate_reset = 0;
__cvmx_usb_write_csr64(usb, CVMX_USBNX_USBP_CTL_STATUS(usb->index),
usbn_usbp_ctl_status.u64);
- /* 8. Program the PHY reset field in the USBN clock-control register:
- USBN_CLK_CTL[PRST] = 1 */
+ /*
+ * 8. Program the PHY reset field in the USBN clock-control register:
+ * USBN_CLK_CTL[PRST] = 1
+ */
usbn_clk_ctl.s.prst = 1;
__cvmx_usb_write_csr64(usb, CVMX_USBNX_CLK_CTL(usb->index),
usbn_clk_ctl.u64);
- /* 9. Program the USBP control and status register to select host or
- device mode. USBN_USBP_CTL_STATUS[HST_MODE] = 0 for host, = 1 for
- device */
+ /*
+ * 9. Program the USBP control and status register to select host or
+ * device mode. USBN_USBP_CTL_STATUS[HST_MODE] = 0 for host, = 1 for
+ * device
+ */
usbn_usbp_ctl_status.s.hst_mode = 0;
__cvmx_usb_write_csr64(usb, CVMX_USBNX_USBP_CTL_STATUS(usb->index),
usbn_usbp_ctl_status.u64);
/* 10. Wait 1 us */
udelay(1);
- /* 11. Program the hreset_n field in the USBN clock-control register:
- USBN_CLK_CTL[HRST] = 1 */
+ /*
+ * 11. Program the hreset_n field in the USBN clock-control register:
+ * USBN_CLK_CTL[HRST] = 1
+ */
usbn_clk_ctl.s.hrst = 1;
__cvmx_usb_write_csr64(usb, CVMX_USBNX_CLK_CTL(usb->index),
usbn_clk_ctl.u64);
usbn_clk_ctl.u64);
udelay(1);
- /* USB Core Initialization */
-
- /* 1. Read USBC_GHWCFG1, USBC_GHWCFG2, USBC_GHWCFG3, USBC_GHWCFG4 to
- determine USB core configuration parameters. */
- /* Nothing needed */
- /* 2. Program the following fields in the global AHB configuration
- register (USBC_GAHBCFG)
- DMA mode, USBC_GAHBCFG[DMAEn]: 1 = DMA mode, 0 = slave mode
- Burst length, USBC_GAHBCFG[HBSTLEN] = 0
- Nonperiodic TxFIFO empty level (slave mode only),
- USBC_GAHBCFG[NPTXFEMPLVL]
- Periodic TxFIFO empty level (slave mode only),
- USBC_GAHBCFG[PTXFEMPLVL]
- Global interrupt mask, USBC_GAHBCFG[GLBLINTRMSK] = 1 */
+ /*
+ * USB Core Initialization
+ *
+ * 1. Read USBC_GHWCFG1, USBC_GHWCFG2, USBC_GHWCFG3, USBC_GHWCFG4 to
+ * determine USB core configuration parameters.
+ *
+ * Nothing needed
+ *
+ * 2. Program the following fields in the global AHB configuration
+ * register (USBC_GAHBCFG)
+ * DMA mode, USBC_GAHBCFG[DMAEn]: 1 = DMA mode, 0 = slave mode
+ * Burst length, USBC_GAHBCFG[HBSTLEN] = 0
+ * Nonperiodic TxFIFO empty level (slave mode only),
+ * USBC_GAHBCFG[NPTXFEMPLVL]
+ * Periodic TxFIFO empty level (slave mode only),
+ * USBC_GAHBCFG[PTXFEMPLVL]
+ * Global interrupt mask, USBC_GAHBCFG[GLBLINTRMSK] = 1
+ */
{
cvmx_usbcx_gahbcfg_t usbcx_gahbcfg;
/* Due to an errata, CN31XX doesn't support DMA */
__cvmx_usb_write_csr32(usb, CVMX_USBCX_GAHBCFG(usb->index),
usbcx_gahbcfg.u32);
}
- /* 3. Program the following fields in USBC_GUSBCFG register.
- HS/FS timeout calibration, USBC_GUSBCFG[TOUTCAL] = 0
- ULPI DDR select, USBC_GUSBCFG[DDRSEL] = 0
- USB turnaround time, USBC_GUSBCFG[USBTRDTIM] = 0x5
- PHY low-power clock select, USBC_GUSBCFG[PHYLPWRCLKSEL] = 0 */
+ /*
+ * 3. Program the following fields in USBC_GUSBCFG register.
+ * HS/FS timeout calibration, USBC_GUSBCFG[TOUTCAL] = 0
+ * ULPI DDR select, USBC_GUSBCFG[DDRSEL] = 0
+ * USB turnaround time, USBC_GUSBCFG[USBTRDTIM] = 0x5
+ * PHY low-power clock select, USBC_GUSBCFG[PHYLPWRCLKSEL] = 0
+ */
{
cvmx_usbcx_gusbcfg_t usbcx_gusbcfg;
usbcx_gusbcfg.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_GUSBCFG(usb->index));
__cvmx_usb_write_csr32(usb, CVMX_USBCX_GUSBCFG(usb->index),
usbcx_gusbcfg.u32);
}
- /* 4. The software must unmask the following bits in the USBC_GINTMSK
- register.
- OTG interrupt mask, USBC_GINTMSK[OTGINTMSK] = 1
- Mode mismatch interrupt mask, USBC_GINTMSK[MODEMISMSK] = 1 */
+ /*
+ * 4. The software must unmask the following bits in the USBC_GINTMSK
+ * register.
+ * OTG interrupt mask, USBC_GINTMSK[OTGINTMSK] = 1
+ * Mode mismatch interrupt mask, USBC_GINTMSK[MODEMISMSK] = 1
+ */
{
cvmx_usbcx_gintmsk_t usbcx_gintmsk;
int channel;
}
{
- /* Host Port Initialization */
-
- /* 1. Program the host-port interrupt-mask field to unmask,
- USBC_GINTMSK[PRTINT] = 1 */
+ /*
+ * Host Port Initialization
+ *
+ * 1. Program the host-port interrupt-mask field to unmask,
+ * USBC_GINTMSK[PRTINT] = 1
+ */
USB_SET_FIELD32(CVMX_USBCX_GINTMSK(usb->index), cvmx_usbcx_gintmsk_t,
prtintmsk, 1);
USB_SET_FIELD32(CVMX_USBCX_GINTMSK(usb->index), cvmx_usbcx_gintmsk_t,
disconnintmsk, 1);
- /* 2. Program the USBC_HCFG register to select full-speed host or
- high-speed host. */
+ /*
+ * 2. Program the USBC_HCFG register to select full-speed host
+ * or high-speed host.
+ */
{
cvmx_usbcx_hcfg_t usbcx_hcfg;
usbcx_hcfg.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCFG(usb->index));
usbcx_hcfg.s.fslspclksel = 0;
__cvmx_usb_write_csr32(usb, CVMX_USBCX_HCFG(usb->index), usbcx_hcfg.u32);
}
- /* 3. Program the port power bit to drive VBUS on the USB,
- USBC_HPRT[PRTPWR] = 1 */
+ /*
+ * 3. Program the port power bit to drive VBUS on the USB,
+ * USBC_HPRT[PRTPWR] = 1
+ */
USB_SET_FIELD32(CVMX_USBCX_HPRT(usb->index), cvmx_usbcx_hprt_t, prtpwr, 1);
- /* Steps 4-15 from the manual are done later in the port enable */
+ /*
+ * Steps 4-15 from the manual are done later in the port enable
+ */
}
return 0;
usb->usbcx_hprt.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HPRT(usb->index));
- /* If the port is already enabled the just return. We don't need to do
- anything */
+ /*
+ * If the port is already enabled the just return. We don't need to do
+ * anything
+ */
if (usb->usbcx_hprt.s.prtena)
return 0;
/* Program the port reset bit to start the reset process */
USB_SET_FIELD32(CVMX_USBCX_HPRT(usb->index), cvmx_usbcx_hprt_t, prtrst, 1);
- /* Wait at least 50ms (high speed), or 10ms (full speed) for the reset
- process to complete. */
+ /*
+ * Wait at least 50ms (high speed), or 10ms (full speed) for the reset
+ * process to complete.
+ */
mdelay(50);
/* Program the port reset bit to 0, USBC_HPRT[PRTRST] = 0 */
usb->usbcx_hprt.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HPRT(usb->index));
usbcx_ghwcfg3.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_GHWCFG3(usb->index));
- /* 13. Program the USBC_GRXFSIZ register to select the size of the receive
- FIFO (25%). */
+ /*
+ * 13. Program the USBC_GRXFSIZ register to select the size of the
+ * receive FIFO (25%).
+ */
USB_SET_FIELD32(CVMX_USBCX_GRXFSIZ(usb->index), cvmx_usbcx_grxfsiz_t,
rxfdep, usbcx_ghwcfg3.s.dfifodepth / 4);
- /* 14. Program the USBC_GNPTXFSIZ register to select the size and the
- start address of the non- periodic transmit FIFO for nonperiodic
- transactions (50%). */
+ /*
+ * 14. Program the USBC_GNPTXFSIZ register to select the size and the
+ * start address of the non- periodic transmit FIFO for nonperiodic
+ * transactions (50%).
+ */
{
cvmx_usbcx_gnptxfsiz_t siz;
siz.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_GNPTXFSIZ(usb->index));
siz.s.nptxfstaddr = usbcx_ghwcfg3.s.dfifodepth / 4;
__cvmx_usb_write_csr32(usb, CVMX_USBCX_GNPTXFSIZ(usb->index), siz.u32);
}
- /* 15. Program the USBC_HPTXFSIZ register to select the size and start
- address of the periodic transmit FIFO for periodic transactions (25%). */
+ /*
+ * 15. Program the USBC_HPTXFSIZ register to select the size and start
+ * address of the periodic transmit FIFO for periodic transactions
+ * (25%).
+ */
{
cvmx_usbcx_hptxfsiz_t siz;
siz.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HPTXFSIZ(usb->index));
pipe->max_packet = max_packet;
pipe->transfer_type = transfer_type;
pipe->transfer_dir = transfer_dir;
- /* All pipes use interval to rate limit NAK processing. Force an interval
- if one wasn't supplied */
+ /*
+ * All pipes use interval to rate limit NAK processing. Force an
+ * interval if one wasn't supplied
+ */
if (!interval)
interval = 1;
if (__cvmx_usb_pipe_needs_split(usb, pipe)) {
pipe->split_sc_frame = -1;
__cvmx_usb_append_pipe(&usb->idle_pipes, pipe);
- /* We don't need to tell the hardware about this pipe yet since
- it doesn't have any submitted requests */
+ /*
+ * We don't need to tell the hardware about this pipe yet since
+ * it doesn't have any submitted requests
+ */
return __cvmx_usb_get_pipe_handle(usb, pipe);
}
*/
static int __cvmx_usb_fill_tx_hw(cvmx_usb_internal_state_t *usb, cvmx_usb_tx_fifo_t *fifo, int available)
{
- /* We're done either when there isn't anymore space or the software FIFO
- is empty */
+ /*
+ * We're done either when there isn't anymore space or the software FIFO
+ * is empty
+ */
while (available && (fifo->head != fifo->tail)) {
int i = fifo->tail;
const uint32_t *ptr = cvmx_phys_to_ptr(fifo->entry[i].address);
fifo->entry[i].address += words * 4;
fifo->entry[i].size -= words;
- /* Write the HW fifo data. The read every three writes is due
- to an errata on CN3XXX chips */
+ /*
+ * Write the HW fifo data. The read every three writes is due
+ * to an errata on CN3XXX chips
+ */
while (words > 3) {
cvmx_write64_uint32(csr_address, *ptr++);
cvmx_write64_uint32(csr_address, *ptr++);
bytes_to_transfer = sizeof(*header);
/* All Control operations start with a setup going OUT */
USB_SET_FIELD32(CVMX_USBCX_HCCHARX(channel, usb->index), cvmx_usbcx_hccharx_t, epdir, CVMX_USB_DIRECTION_OUT);
- /* Setup send the control header instead of the buffer data. The
- buffer data will be used in the next stage */
+ /*
+ * Setup send the control header instead of the buffer data. The
+ * buffer data will be used in the next stage
+ */
__cvmx_usb_write_csr64(usb, CVMX_USBNX_DMA0_OUTB_CHN0(usb->index) + channel*8, transaction->control_header);
break;
case CVMX_USB_STAGE_SETUP_SPLIT_COMPLETE:
break;
}
- /* Make sure the transfer never exceeds the byte limit of the hardware.
- Further bytes will be sent as continued transactions */
+ /*
+ * Make sure the transfer never exceeds the byte limit of the hardware.
+ * Further bytes will be sent as continued transactions
+ */
if (bytes_to_transfer > MAX_TRANSFER_BYTES) {
/* Round MAX_TRANSFER_BYTES to a multiple of out packet size */
bytes_to_transfer = MAX_TRANSFER_BYTES / pipe->max_packet;
bytes_to_transfer *= pipe->max_packet;
}
- /* Calculate the number of packets to transfer. If the length is zero
- we still need to transfer one packet */
+ /*
+ * Calculate the number of packets to transfer. If the length is zero
+ * we still need to transfer one packet
+ */
packets_to_transfer = (bytes_to_transfer + pipe->max_packet - 1) / pipe->max_packet;
if (packets_to_transfer == 0)
packets_to_transfer = 1;
else if ((packets_to_transfer > 1) && (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA)) {
- /* Limit to one packet when not using DMA. Channels must be restarted
- between every packet for IN transactions, so there is no reason to
- do multiple packets in a row */
+ /*
+ * Limit to one packet when not using DMA. Channels must be
+ * restarted between every packet for IN transactions, so there
+ * is no reason to do multiple packets in a row
+ */
packets_to_transfer = 1;
bytes_to_transfer = packets_to_transfer * pipe->max_packet;
} else if (packets_to_transfer > MAX_TRANSFER_PACKETS) {
- /* Limit the number of packet and data transferred to what the
- hardware can handle */
+ /*
+ * Limit the number of packet and data transferred to what the
+ * hardware can handle
+ */
packets_to_transfer = MAX_TRANSFER_PACKETS;
bytes_to_transfer = packets_to_transfer * pipe->max_packet;
}
int packets_to_transfer;
int bytes_to_transfer = transaction->buffer_length - transaction->actual_bytes;
- /* ISOCHRONOUS transactions store each individual transfer size in the
- packet structure, not the global buffer_length */
+ /*
+ * ISOCHRONOUS transactions store each individual transfer size
+ * in the packet structure, not the global buffer_length
+ */
if (transaction->type == CVMX_USB_TRANSFER_ISOCHRONOUS)
bytes_to_transfer = transaction->iso_packets[0].length - transaction->actual_bytes;
- /* We need to do split transactions when we are talking to non high
- speed devices that are behind a high speed hub */
+ /*
+ * We need to do split transactions when we are talking to non
+ * high speed devices that are behind a high speed hub
+ */
if (__cvmx_usb_pipe_needs_split(usb, pipe)) {
- /* On the start split phase (stage is even) record the frame number we
- will need to send the split complete. We only store the lower two bits
- since the time ahead can only be two frames */
+ /*
+ * On the start split phase (stage is even) record the
+ * frame number we will need to send the split complete.
+ * We only store the lower two bits since the time ahead
+ * can only be two frames
+ */
if ((transaction->stage&1) == 0) {
if (transaction->type == CVMX_USB_TRANSFER_BULK)
pipe->split_sc_frame = (usb->frame_number + 1) & 0x7f;
usbc_hcsplt.s.prtaddr = pipe->hub_port;
usbc_hcsplt.s.compsplt = (transaction->stage == CVMX_USB_STAGE_NON_CONTROL_SPLIT_COMPLETE);
- /* SPLIT transactions can only ever transmit one data packet so
- limit the transfer size to the max packet size */
+ /*
+ * SPLIT transactions can only ever transmit one data
+ * packet so limit the transfer size to the max packet
+ * size
+ */
if (bytes_to_transfer > pipe->max_packet)
bytes_to_transfer = pipe->max_packet;
- /* ISOCHRONOUS OUT splits are unique in that they limit
- data transfers to 188 byte chunks representing the
- begin/middle/end of the data or all */
+ /*
+ * ISOCHRONOUS OUT splits are unique in that they limit
+ * data transfers to 188 byte chunks representing the
+ * begin/middle/end of the data or all
+ */
if (!usbc_hcsplt.s.compsplt &&
(pipe->transfer_dir == CVMX_USB_DIRECTION_OUT) &&
(pipe->transfer_type == CVMX_USB_TRANSFER_ISOCHRONOUS)) {
- /* Clear the split complete frame number as there isn't going
- to be a split complete */
+ /*
+ * Clear the split complete frame number as
+ * there isn't going to be a split complete
+ */
pipe->split_sc_frame = -1;
- /* See if we've started this transfer and sent data */
+ /*
+ * See if we've started this transfer and sent
+ * data
+ */
if (transaction->actual_bytes == 0) {
- /* Nothing sent yet, this is either a begin or the
- entire payload */
+ /*
+ * Nothing sent yet, this is either a
+ * begin or the entire payload
+ */
if (bytes_to_transfer <= 188)
usbc_hcsplt.s.xactpos = 3; /* Entire payload in one go */
else
usbc_hcsplt.s.xactpos = 2; /* First part of payload */
} else {
- /* Continuing the previous data, we must either be
- in the middle or at the end */
+ /*
+ * Continuing the previous data, we must
+ * either be in the middle or at the end
+ */
if (bytes_to_transfer <= 188)
usbc_hcsplt.s.xactpos = 1; /* End of payload */
else
usbc_hcsplt.s.xactpos = 0; /* Middle of payload */
}
- /* Again, the transfer size is limited to 188 bytes */
+ /*
+ * Again, the transfer size is limited to 188
+ * bytes
+ */
if (bytes_to_transfer > 188)
bytes_to_transfer = 188;
}
}
- /* Make sure the transfer never exceeds the byte limit of the hardware.
- Further bytes will be sent as continued transactions */
+ /*
+ * Make sure the transfer never exceeds the byte limit of the
+ * hardware. Further bytes will be sent as continued
+ * transactions
+ */
if (bytes_to_transfer > MAX_TRANSFER_BYTES) {
- /* Round MAX_TRANSFER_BYTES to a multiple of out packet size */
+ /*
+ * Round MAX_TRANSFER_BYTES to a multiple of out packet
+ * size
+ */
bytes_to_transfer = MAX_TRANSFER_BYTES / pipe->max_packet;
bytes_to_transfer *= pipe->max_packet;
}
- /* Calculate the number of packets to transfer. If the length is zero
- we still need to transfer one packet */
+ /*
+ * Calculate the number of packets to transfer. If the length is
+ * zero we still need to transfer one packet
+ */
packets_to_transfer = (bytes_to_transfer + pipe->max_packet - 1) / pipe->max_packet;
if (packets_to_transfer == 0)
packets_to_transfer = 1;
else if ((packets_to_transfer > 1) && (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA)) {
- /* Limit to one packet when not using DMA. Channels must be restarted
- between every packet for IN transactions, so there is no reason to
- do multiple packets in a row */
+ /*
+ * Limit to one packet when not using DMA. Channels must
+ * be restarted between every packet for IN
+ * transactions, so there is no reason to do multiple
+ * packets in a row
+ */
packets_to_transfer = 1;
bytes_to_transfer = packets_to_transfer * pipe->max_packet;
} else if (packets_to_transfer > MAX_TRANSFER_PACKETS) {
- /* Limit the number of packet and data transferred to what the
- hardware can handle */
+ /*
+ * Limit the number of packet and data transferred to
+ * what the hardware can handle
+ */
packets_to_transfer = MAX_TRANSFER_PACKETS;
bytes_to_transfer = packets_to_transfer * pipe->max_packet;
}
/* Update the DATA0/DATA1 toggle */
usbc_hctsiz.s.pid = __cvmx_usb_get_data_pid(pipe);
- /* High speed pipes may need a hardware ping before they start */
+ /*
+ * High speed pipes may need a hardware ping before they start
+ */
if (pipe->flags & __CVMX_USB_PIPE_FLAGS_NEED_PING)
usbc_hctsiz.s.dopng = 1;
{
cvmx_usbcx_hccharx_t usbc_hcchar = {.u32 = 0};
- /* Set the startframe odd/even properly. This is only used for periodic */
+ /*
+ * Set the startframe odd/even properly. This is only used for
+ * periodic
+ */
usbc_hcchar.s.oddfrm = usb->frame_number&1;
- /* Set the number of back to back packets allowed by this endpoint.
- Split transactions interpret "ec" as the number of immediate
- retries of failure. These retries happen too quickly, so we
- disable these entirely for splits */
+ /*
+ * Set the number of back to back packets allowed by this
+ * endpoint. Split transactions interpret "ec" as the number of
+ * immediate retries of failure. These retries happen too
+ * quickly, so we disable these entirely for splits
+ */
if (__cvmx_usb_pipe_needs_split(usb, pipe))
usbc_hcchar.s.ec = 1;
else if (pipe->multi_count < 1)
break;
case CVMX_USB_TRANSFER_ISOCHRONOUS:
if (!__cvmx_usb_pipe_needs_split(usb, pipe)) {
- /* ISO transactions require different PIDs depending on direction
- and how many packets are needed */
+ /*
+ * ISO transactions require different PIDs depending on
+ * direction and how many packets are needed
+ */
if (pipe->transfer_dir == CVMX_USB_DIRECTION_OUT) {
if (pipe->multi_count < 2) /* Need DATA0 */
USB_SET_FIELD32(CVMX_USBCX_HCTSIZX(channel, usb->index), cvmx_usbcx_hctsizx_t, pid, 0);
/* Find a pipe needing service */
pipe = NULL;
if (is_sof) {
- /* Only process periodic pipes on SOF interrupts. This way we are
- sure that the periodic data is sent in the beginning of the
- frame */
+ /*
+ * Only process periodic pipes on SOF interrupts. This
+ * way we are sure that the periodic data is sent in the
+ * beginning of the frame
+ */
pipe = __cvmx_usb_find_ready_pipe(usb, usb->active_pipes + CVMX_USB_TRANSFER_ISOCHRONOUS, usb->frame_number);
if (likely(!pipe))
pipe = __cvmx_usb_find_ready_pipe(usb, usb->active_pipes + CVMX_USB_TRANSFER_INTERRUPT, usb->frame_number);
}
done:
- /* Only enable SOF interrupts when we have transactions pending in the
- future that might need to be scheduled */
+ /*
+ * Only enable SOF interrupts when we have transactions pending in the
+ * future that might need to be scheduled
+ */
need_sof = 0;
for (ttype = CVMX_USB_TRANSFER_CONTROL; ttype <= CVMX_USB_TRANSFER_INTERRUPT; ttype++) {
pipe = usb->active_pipes[ttype].head;
if (usb->active_split == transaction)
usb->active_split = NULL;
- /* Isochronous transactions need extra processing as they might not be done
- after a single data transfer */
+ /*
+ * Isochronous transactions need extra processing as they might not be
+ * done after a single data transfer
+ */
if (unlikely(transaction->type == CVMX_USB_TRANSFER_ISOCHRONOUS)) {
/* Update the number of bytes transferred in this ISO packet */
transaction->iso_packets[0].length = transaction->actual_bytes;
transaction->iso_packets[0].status = complete_code;
- /* If there are more ISOs pending and we succeeded, schedule the next
- one */
+ /*
+ * If there are more ISOs pending and we succeeded, schedule the
+ * next one
+ */
if ((transaction->iso_number_packets > 1) && (complete_code == CVMX_USB_COMPLETE_SUCCESS)) {
transaction->actual_bytes = 0; /* No bytes transferred for this packet as of yet */
transaction->iso_number_packets--; /* One less ISO waiting to transfer */
if (unlikely((transaction->flags & __CVMX_USB_TRANSACTION_FLAGS_IN_USE) == 0))
return -EINVAL;
- /* If the transaction is the HEAD of the queue and scheduled. We need to
- treat it special */
+ /*
+ * If the transaction is the HEAD of the queue and scheduled. We need to
+ * treat it special
+ */
if ((pipe->head == transaction) &&
(pipe->flags & __CVMX_USB_PIPE_FLAGS_SCHEDULED)) {
cvmx_usbcx_hccharx_t usbc_hcchar;
usbc_hcchar.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCCHARX(channel, usb->index));
if (usbc_hcchar.s.chena && usbc_hcchar.s.chdis) {
- /* There seems to be a bug in CN31XX which can cause interrupt
- IN transfers to get stuck until we do a write of HCCHARX
- without changing things */
+ /*
+ * There seems to be a bug in CN31XX which can cause
+ * interrupt IN transfers to get stuck until we do a
+ * write of HCCHARX without changing things
+ */
__cvmx_usb_write_csr32(usb, CVMX_USBCX_HCCHARX(channel, usb->index), usbc_hcchar.u32);
return 0;
}
- /* In non DMA mode the channels don't halt themselves. We need to
- manually disable channels that are left running */
+ /*
+ * In non DMA mode the channels don't halt themselves. We need
+ * to manually disable channels that are left running
+ */
if (!usbc_hcint.s.chhltd) {
if (usbc_hcchar.s.chena) {
cvmx_usbcx_hcintmskx_t hcintmsk;
}
}
} else {
- /* There is are no interrupts that we need to process when the channel is
- still running */
+ /*
+ * There is are no interrupts that we need to process when the
+ * channel is still running
+ */
if (!usbc_hcint.s.chhltd)
return 0;
}
transaction = pipe->head;
CVMX_PREFETCH0(transaction);
- /* Disconnect this pipe from the HW channel. Later the schedule function will
- figure out which pipe needs to go */
+ /*
+ * Disconnect this pipe from the HW channel. Later the schedule
+ * function will figure out which pipe needs to go
+ */
usb->pipe_for_channel[channel] = NULL;
pipe->flags &= ~__CVMX_USB_PIPE_FLAGS_SCHEDULED;
- /* Read the channel config info so we can figure out how much data
- transfered */
+ /*
+ * Read the channel config info so we can figure out how much data
+ * transfered
+ */
usbc_hcchar.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCCHARX(channel, usb->index));
usbc_hctsiz.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCTSIZX(channel, usb->index));
- /* Calculating the number of bytes successfully transferred is dependent on
- the transfer direction */
+ /*
+ * Calculating the number of bytes successfully transferred is dependent
+ * on the transfer direction
+ */
packets_processed = transaction->pktcnt - usbc_hctsiz.s.pktcnt;
if (usbc_hcchar.s.epdir) {
- /* IN transactions are easy. For every byte received the hardware
- decrements xfersize. All we need to do is subtract the current
- value of xfersize from its starting value and we know how many
- bytes were written to the buffer */
+ /*
+ * IN transactions are easy. For every byte received the
+ * hardware decrements xfersize. All we need to do is subtract
+ * the current value of xfersize from its starting value and we
+ * know how many bytes were written to the buffer
+ */
bytes_this_transfer = transaction->xfersize - usbc_hctsiz.s.xfersize;
} else {
- /* OUT transaction don't decrement xfersize. Instead pktcnt is
- decremented on every successful packet send. The hardware does
- this when it receives an ACK, or NYET. If it doesn't
- receive one of these responses pktcnt doesn't change */
+ /*
+ * OUT transaction don't decrement xfersize. Instead pktcnt is
+ * decremented on every successful packet send. The hardware
+ * does this when it receives an ACK, or NYET. If it doesn't
+ * receive one of these responses pktcnt doesn't change
+ */
bytes_this_transfer = packets_processed * usbc_hcchar.s.mps;
- /* The last packet may not be a full transfer if we didn't have
- enough data */
+ /*
+ * The last packet may not be a full transfer if we didn't have
+ * enough data
+ */
if (bytes_this_transfer > transaction->xfersize)
bytes_this_transfer = transaction->xfersize;
}
else
bytes_in_last_packet = bytes_this_transfer;
- /* As a special case, setup transactions output the setup header, not
- the user's data. For this reason we don't count setup data as bytes
- transferred */
+ /*
+ * As a special case, setup transactions output the setup header, not
+ * the user's data. For this reason we don't count setup data as bytes
+ * transferred
+ */
if ((transaction->stage == CVMX_USB_STAGE_SETUP) ||
(transaction->stage == CVMX_USB_STAGE_SETUP_SPLIT_COMPLETE))
bytes_this_transfer = 0;
- /* Add the bytes transferred to the running total. It is important that
- bytes_this_transfer doesn't count any data that needs to be
- retransmitted */
+ /*
+ * Add the bytes transferred to the running total. It is important that
+ * bytes_this_transfer doesn't count any data that needs to be
+ * retransmitted
+ */
transaction->actual_bytes += bytes_this_transfer;
if (transaction->type == CVMX_USB_TRANSFER_ISOCHRONOUS)
buffer_space_left = transaction->iso_packets[0].length - transaction->actual_bytes;
else
buffer_space_left = transaction->buffer_length - transaction->actual_bytes;
- /* We need to remember the PID toggle state for the next transaction. The
- hardware already updated it for the next transaction */
+ /*
+ * We need to remember the PID toggle state for the next transaction.
+ * The hardware already updated it for the next transaction
+ */
pipe->pid_toggle = !(usbc_hctsiz.s.pid == 0);
- /* For high speed bulk out, assume the next transaction will need to do a
- ping before proceeding. If this isn't true the ACK processing below
- will clear this flag */
+ /*
+ * For high speed bulk out, assume the next transaction will need to do
+ * a ping before proceeding. If this isn't true the ACK processing below
+ * will clear this flag
+ */
if ((pipe->device_speed == CVMX_USB_SPEED_HIGH) &&
(pipe->transfer_type == CVMX_USB_TRANSFER_BULK) &&
(pipe->transfer_dir == CVMX_USB_DIRECTION_OUT))
pipe->flags |= __CVMX_USB_PIPE_FLAGS_NEED_PING;
if (usbc_hcint.s.stall) {
- /* STALL as a response means this transaction cannot be completed
- because the device can't process transactions. Tell the user. Any
- data that was transferred will be counted on the actual bytes
- transferred */
+ /*
+ * STALL as a response means this transaction cannot be
+ * completed because the device can't process transactions. Tell
+ * the user. Any data that was transferred will be counted on
+ * the actual bytes transferred
+ */
pipe->pid_toggle = 0;
__cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_STALL);
} else if (usbc_hcint.s.xacterr) {
- /* We know at least one packet worked if we get a ACK or NAK. Reset the retry counter */
+ /*
+ * We know at least one packet worked if we get a ACK or NAK.
+ * Reset the retry counter
+ */
if (usbc_hcint.s.nak || usbc_hcint.s.ack)
transaction->retries = 0;
transaction->retries++;
if (transaction->retries > MAX_RETRIES) {
- /* XactErr as a response means the device signaled something wrong with
- the transfer. For example, PID toggle errors cause these */
+ /*
+ * XactErr as a response means the device signaled
+ * something wrong with the transfer. For example, PID
+ * toggle errors cause these
+ */
__cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_XACTERR);
} else {
- /* If this was a split then clear our split in progress marker */
+ /*
+ * If this was a split then clear our split in progress
+ * marker
+ */
if (usb->active_split == transaction)
usb->active_split = NULL;
- /* Rewind to the beginning of the transaction by anding off the
- split complete bit */
+ /*
+ * Rewind to the beginning of the transaction by anding
+ * off the split complete bit
+ */
transaction->stage &= ~1;
pipe->split_sc_frame = -1;
pipe->next_tx_frame += pipe->interval;
/* We'll retry the exact same transaction again */
transaction->retries++;
} else if (usbc_hcint.s.nyet) {
- /* NYET as a response is only allowed in three cases: as a response to
- a ping, as a response to a split transaction, and as a response to
- a bulk out. The ping case is handled by hardware, so we only have
- splits and bulk out */
+ /*
+ * NYET as a response is only allowed in three cases: as a
+ * response to a ping, as a response to a split transaction, and
+ * as a response to a bulk out. The ping case is handled by
+ * hardware, so we only have splits and bulk out
+ */
if (!__cvmx_usb_pipe_needs_split(usb, pipe)) {
transaction->retries = 0;
- /* If there is more data to go then we need to try again. Otherwise
- this transaction is complete */
+ /*
+ * If there is more data to go then we need to try
+ * again. Otherwise this transaction is complete
+ */
if ((buffer_space_left == 0) || (bytes_in_last_packet < pipe->max_packet))
__cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_SUCCESS);
} else {
- /* Split transactions retry the split complete 4 times then rewind
- to the start split and do the entire transactions again */
+ /*
+ * Split transactions retry the split complete 4 times
+ * then rewind to the start split and do the entire
+ * transactions again
+ */
transaction->retries++;
if ((transaction->retries & 0x3) == 0) {
- /* Rewind to the beginning of the transaction by anding off the
- split complete bit */
+ /*
+ * Rewind to the beginning of the transaction by
+ * anding off the split complete bit
+ */
transaction->stage &= ~1;
pipe->split_sc_frame = -1;
}
}
} else if (usbc_hcint.s.ack) {
transaction->retries = 0;
- /* The ACK bit can only be checked after the other error bits. This is
- because a multi packet transfer may succeed in a number of packets
- and then get a different response on the last packet. In this case
- both ACK and the last response bit will be set. If none of the
- other response bits is set, then the last packet must have been an
- ACK */
-
- /* Since we got an ACK, we know we don't need to do a ping on this
- pipe */
+ /*
+ * The ACK bit can only be checked after the other error bits.
+ * This is because a multi packet transfer may succeed in a
+ * number of packets and then get a different response on the
+ * last packet. In this case both ACK and the last response bit
+ * will be set. If none of the other response bits is set, then
+ * the last packet must have been an ACK
+ *
+ * Since we got an ACK, we know we don't need to do a ping on
+ * this pipe
+ */
pipe->flags &= ~__CVMX_USB_PIPE_FLAGS_NEED_PING;
switch (transaction->type) {
case CVMX_USB_STAGE_DATA:
if (__cvmx_usb_pipe_needs_split(usb, pipe)) {
transaction->stage = CVMX_USB_STAGE_DATA_SPLIT_COMPLETE;
- /* For setup OUT data that are splits, the hardware
- doesn't appear to count transferred data. Here
- we manually update the data transferred */
+ /*
+ * For setup OUT data that are splits,
+ * the hardware doesn't appear to count
+ * transferred data. Here we manually
+ * update the data transferred
+ */
if (!usbc_hcchar.s.epdir) {
if (buffer_space_left < pipe->max_packet)
transaction->actual_bytes += buffer_space_left;
break;
case CVMX_USB_TRANSFER_BULK:
case CVMX_USB_TRANSFER_INTERRUPT:
- /* The only time a bulk transfer isn't complete when
- it finishes with an ACK is during a split transaction. For
- splits we need to continue the transfer if more data is
- needed */
+ /*
+ * The only time a bulk transfer isn't complete when it
+ * finishes with an ACK is during a split transaction.
+ * For splits we need to continue the transfer if more
+ * data is needed
+ */
if (__cvmx_usb_pipe_needs_split(usb, pipe)) {
if (transaction->stage == CVMX_USB_STAGE_NON_CONTROL)
transaction->stage = CVMX_USB_STAGE_NON_CONTROL_SPLIT_COMPLETE;
break;
case CVMX_USB_TRANSFER_ISOCHRONOUS:
if (__cvmx_usb_pipe_needs_split(usb, pipe)) {
- /* ISOCHRONOUS OUT splits don't require a complete split stage.
- Instead they use a sequence of begin OUT splits to transfer
- the data 188 bytes at a time. Once the transfer is complete,
- the pipe sleeps until the next schedule interval */
+ /*
+ * ISOCHRONOUS OUT splits don't require a
+ * complete split stage. Instead they use a
+ * sequence of begin OUT splits to transfer the
+ * data 188 bytes at a time. Once the transfer
+ * is complete, the pipe sleeps until the next
+ * schedule interval
+ */
if (pipe->transfer_dir == CVMX_USB_DIRECTION_OUT) {
- /* If no space left or this wasn't a max size packet then
- this transfer is complete. Otherwise start it again
- to send the next 188 bytes */
+ /*
+ * If no space left or this wasn't a max
+ * size packet then this transfer is
+ * complete. Otherwise start it again to
+ * send the next 188 bytes
+ */
if (!buffer_space_left || (bytes_this_transfer < 188)) {
pipe->next_tx_frame += pipe->interval;
__cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_SUCCESS);
}
} else {
if (transaction->stage == CVMX_USB_STAGE_NON_CONTROL_SPLIT_COMPLETE) {
- /* We are in the incoming data phase. Keep getting
- data until we run out of space or get a small
- packet */
+ /*
+ * We are in the incoming data
+ * phase. Keep getting data
+ * until we run out of space or
+ * get a small packet
+ */
if ((buffer_space_left == 0) || (bytes_in_last_packet < pipe->max_packet)) {
pipe->next_tx_frame += pipe->interval;
__cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_SUCCESS);
/* If this was a split then clear our split in progress marker */
if (usb->active_split == transaction)
usb->active_split = NULL;
- /* NAK as a response means the device couldn't accept the transaction,
- but it should be retried in the future. Rewind to the beginning of
- the transaction by anding off the split complete bit. Retry in the
- next interval */
+ /*
+ * NAK as a response means the device couldn't accept the
+ * transaction, but it should be retried in the future. Rewind
+ * to the beginning of the transaction by anding off the split
+ * complete bit. Retry in the next interval
+ */
transaction->retries = 0;
transaction->stage &= ~1;
pipe->next_tx_frame += pipe->interval;
/* We'll retry the exact same transaction again */
transaction->retries++;
} else {
- /* We get channel halted interrupts with no result bits sets when the
- cable is unplugged */
+ /*
+ * We get channel halted interrupts with no result bits
+ * sets when the cable is unplugged
+ */
__cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_ERROR);
}
}
__cvmx_usb_write_csr32(usb, CVMX_USBCX_GINTSTS(usb->index), usbc_gintsts.u32);
if (usbc_gintsts.s.rxflvl) {
- /* RxFIFO Non-Empty (RxFLvl)
- Indicates that there is at least one packet pending to be read
- from the RxFIFO. */
- /* In DMA mode this is handled by hardware */
+ /*
+ * RxFIFO Non-Empty (RxFLvl)
+ * Indicates that there is at least one packet pending to be
+ * read from the RxFIFO.
+ *
+ * In DMA mode this is handled by hardware
+ */
if (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA)
__cvmx_usb_poll_rx_fifo(usb);
}
}
if (usbc_gintsts.s.disconnint || usbc_gintsts.s.prtint) {
cvmx_usbcx_hprt_t usbc_hprt;
- /* Disconnect Detected Interrupt (DisconnInt)
- Asserted when a device disconnect is detected. */
-
- /* Host Port Interrupt (PrtInt)
- The core sets this bit to indicate a change in port status of one
- of the O2P USB core ports in Host mode. The application must
- read the Host Port Control and Status (HPRT) register to
- determine the exact event that caused this interrupt. The
- application must clear the appropriate status bit in the Host Port
- Control and Status register to clear this bit. */
-
- /* Call the user's port callback */
+ /*
+ * Disconnect Detected Interrupt (DisconnInt)
+ * Asserted when a device disconnect is detected.
+ *
+ * Host Port Interrupt (PrtInt)
+ * The core sets this bit to indicate a change in port status of
+ * one of the O2P USB core ports in Host mode. The application
+ * must read the Host Port Control and Status (HPRT) register to
+ * determine the exact event that caused this interrupt. The
+ * application must clear the appropriate status bit in the Host
+ * Port Control and Status register to clear this bit.
+ *
+ * Call the user's port callback
+ */
__cvmx_usb_perform_callback(usb, NULL, NULL,
CVMX_USB_CALLBACK_PORT_CHANGED,
CVMX_USB_COMPLETE_SUCCESS);
__cvmx_usb_write_csr32(usb, CVMX_USBCX_HPRT(usb->index), usbc_hprt.u32);
}
if (usbc_gintsts.s.hchint) {
- /* Host Channels Interrupt (HChInt)
- The core sets this bit to indicate that an interrupt is pending on
- one of the channels of the core (in Host mode). The application
- must read the Host All Channels Interrupt (HAINT) register to
- determine the exact number of the channel on which the
- interrupt occurred, and then read the corresponding Host
- Channel-n Interrupt (HCINTn) register to determine the exact
- cause of the interrupt. The application must clear the
- appropriate status bit in the HCINTn register to clear this bit. */
+ /*
+ * Host Channels Interrupt (HChInt)
+ * The core sets this bit to indicate that an interrupt is
+ * pending on one of the channels of the core (in Host mode).
+ * The application must read the Host All Channels Interrupt
+ * (HAINT) register to determine the exact number of the channel
+ * on which the interrupt occurred, and then read the
+ * corresponding Host Channel-n Interrupt (HCINTn) register to
+ * determine the exact cause of the interrupt. The application
+ * must clear the appropriate status bit in the HCINTn register
+ * to clear this bit.
+ */
cvmx_usbcx_haint_t usbc_haint;
usbc_haint.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HAINT(usb->index));
while (usbc_haint.u32) {
projects / ~andy / linux / commitdiff