diff options
| -rw-r--r-- | drivers/staging/octeon-usb/cvmx-usb.c | 149 |
1 files changed, 108 insertions, 41 deletions
diff --git a/drivers/staging/octeon-usb/cvmx-usb.c b/drivers/staging/octeon-usb/cvmx-usb.c index 4cf7b8bc81e1..910a657b6292 100644 --- a/drivers/staging/octeon-usb/cvmx-usb.c +++ b/drivers/staging/octeon-usb/cvmx-usb.c @@ -20,16 +20,16 @@ * derived from this software without specific prior written * permission. - * This Software, including technical data, may be subject to U.S. export control - * laws, including the U.S. Export Administration Act and its associated + * This Software, including technical data, may be subject to U.S. export + * control laws, including the U.S. Export Administration Act and its associated * regulations, and may be subject to export or import regulations in other * countries. * TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS" - * AND WITH ALL FAULTS AND CAVIUM NETWORKS MAKES NO PROMISES, REPRESENTATIONS OR + * AND WITH ALL FAULTS AND CAVIUM NETWORKS MAKES NO PROMISES, REPRESENTATIONS OR * WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH RESPECT TO - * THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY REPRESENTATION OR - * DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT DEFECTS, AND CAVIUM + * THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY REPRESENTATION + * OR DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT DEFECTS, AND CAVIUM * SPECIFICALLY DISCLAIMS ALL IMPLIED (IF ANY) WARRANTIES OF TITLE, * MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR A PARTICULAR PURPOSE, LACK OF * VIRUSES, ACCURACY OR COMPLETENESS, QUIET ENJOYMENT, QUIET POSSESSION OR @@ -60,15 +60,38 @@ /* Normal prefetch that use the pref instruction. */ #define CVMX_PREFETCH(address, offset) asm volatile ("pref %[type], %[off](%[rbase])" : : [rbase] "d" (address), [off] "I" (offset), [type] "n" (0)) -#define MAX_RETRIES 3 /* Maximum number of times to retry failed transactions */ -#define MAX_PIPES 32 /* Maximum number of pipes that can be open at once */ -#define MAX_TRANSACTIONS 256 /* Maximum number of outstanding transactions across all pipes */ -#define MAX_CHANNELS 8 /* Maximum number of hardware channels supported by the USB block */ -#define MAX_USB_ADDRESS 127 /* The highest valid USB device address */ -#define MAX_USB_ENDPOINT 15 /* The highest valid USB endpoint number */ -#define MAX_USB_HUB_PORT 15 /* The highest valid port number on a hub */ -#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 */ +/* Maximum number of times to retry failed transactions */ +#define MAX_RETRIES 3 + +/* Maximum number of pipes that can be open at once */ +#define MAX_PIPES 32 + +/* Maximum number of outstanding transactions across all pipes */ +#define MAX_TRANSACTIONS 256 + +/* Maximum number of hardware channels supported by the USB block */ +#define MAX_CHANNELS 8 + +/* The highest valid USB device address */ +#define MAX_USB_ADDRESS 127 + +/* The highest valid USB endpoint number */ +#define MAX_USB_ENDPOINT 15 + +/* The highest valid port number on a hub */ +#define MAX_USB_HUB_PORT 15 + +/* + * 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_BYTES ((1<<19)-1) + +/* + * The low level hardware can transfer a maximum of this number of packets in + * each transfer. The field is 10 bits wide + */ +#define MAX_TRANSFER_PACKETS ((1<<10)-1) enum cvmx_usb_transaction_flags { __CVMX_USB_TRANSACTION_FLAGS_IN_USE = 1<<16, @@ -622,12 +645,15 @@ int cvmx_usb_initialize(struct cvmx_usb_state *state, int usb_port_number) * Most Octeon evaluation boards require this setting */ if (OCTEON_IS_MODEL(OCTEON_CN3XXX)) { - usbn_clk_ctl.cn31xx.p_rclk = 1; /* From CN31XX,CN30XX manual */ + /* From CN31XX,CN30XX manual */ + usbn_clk_ctl.cn31xx.p_rclk = 1; usbn_clk_ctl.cn31xx.p_xenbn = 0; } else if (OCTEON_IS_MODEL(OCTEON_CN56XX) || OCTEON_IS_MODEL(OCTEON_CN50XX)) - usbn_clk_ctl.cn56xx.p_rtype = 2; /* From CN56XX,CN50XX manual */ + /* From CN56XX,CN50XX manual */ + usbn_clk_ctl.cn56xx.p_rtype = 2; else - usbn_clk_ctl.cn52xx.p_rtype = 1; /* From CN52XX manual */ + /* From CN52XX manual */ + usbn_clk_ctl.cn52xx.p_rtype = 1; switch (flags & CVMX_USB_INITIALIZE_FLAGS_CLOCK_MHZ_MASK) { case CVMX_USB_INITIALIZE_FLAGS_CLOCK_12MHZ: @@ -646,12 +672,15 @@ int cvmx_usb_initialize(struct cvmx_usb_state *state, int usb_port_number) * at USB_XO and USB_XI */ if (OCTEON_IS_MODEL(OCTEON_CN3XXX)) { - usbn_clk_ctl.cn31xx.p_rclk = 1; /* From CN31XX,CN30XX manual */ + /* From CN31XX,CN30XX manual */ + usbn_clk_ctl.cn31xx.p_rclk = 1; usbn_clk_ctl.cn31xx.p_xenbn = 1; } else if (OCTEON_IS_MODEL(OCTEON_CN56XX) || OCTEON_IS_MODEL(OCTEON_CN50XX)) - usbn_clk_ctl.cn56xx.p_rtype = 0; /* From CN56XX,CN50XX manual */ + /* From CN56XX,CN50XX manual */ + usbn_clk_ctl.cn56xx.p_rtype = 0; else - usbn_clk_ctl.cn52xx.p_rtype = 0; /* From CN52XX manual */ + /* From CN52XX manual */ + usbn_clk_ctl.cn52xx.p_rtype = 0; usbn_clk_ctl.s.p_c_sel = 0; } @@ -662,7 +691,8 @@ int cvmx_usb_initialize(struct cvmx_usb_state *state, int usb_port_number) */ { int divisor = (octeon_get_clock_rate()+125000000-1)/125000000; - if (divisor < 4) /* Lower than 4 doesn't seem to work properly */ + /* Lower than 4 doesn't seem to work properly */ + if (divisor < 4) divisor = 4; usbn_clk_ctl.s.divide = divisor; usbn_clk_ctl.s.divide2 = 0; @@ -759,9 +789,11 @@ int cvmx_usb_initialize(struct cvmx_usb_state *state, int usb_port_number) usbcx_gahbcfg.u32 = 0; usbcx_gahbcfg.s.dmaen = !(usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA); if (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA) - usb->idle_hardware_channels = 0x1; /* Only use one channel with non DMA */ + /* Only use one channel with non DMA */ + usb->idle_hardware_channels = 0x1; else if (OCTEON_IS_MODEL(OCTEON_CN5XXX)) - usb->idle_hardware_channels = 0xf7; /* CN5XXX have an errata with channel 3 */ + /* CN5XXX have an errata with channel 3 */ + usb->idle_hardware_channels = 0xf7; else usb->idle_hardware_channels = 0xff; usbcx_gahbcfg.s.hbstlen = 0; @@ -809,7 +841,10 @@ int cvmx_usb_initialize(struct cvmx_usb_state *state, int usb_port_number) __cvmx_usb_write_csr32(usb, CVMX_USBCX_GINTMSK(usb->index), usbcx_gintmsk.u32); - /* Disable all channel interrupts. We'll enable them per channel later */ + /* + * Disable all channel interrupts. We'll enable them per channel + * later. + */ for (channel = 0; channel < 8; channel++) __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCINTMSKX(channel, usb->index), 0); } @@ -932,7 +967,10 @@ int cvmx_usb_enable(struct cvmx_usb_state *state) prtena, ==, 1, 100000)) return -ETIMEDOUT; - /* Read the port speed field to get the enumerated speed, USBC_HPRT[PRTSPD]. */ + /* + * Read the port speed field to get the enumerated speed, + * USBC_HPRT[PRTSPD]. + */ 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)); @@ -1384,7 +1422,10 @@ static void __cvmx_usb_fill_tx_fifo(struct cvmx_usb_internal_state *usb, int cha if (usbc_hcsplt.s.spltena && usbc_hcsplt.s.compsplt) return; - /* Find out how many bytes we need to fill and convert it into 32bit words */ + /* + * Find out how many bytes we need to fill and convert it into 32bit + * words. + */ usbc_hctsiz.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCTSIZX(channel, usb->index)); if (!usbc_hctsiz.s.xfersize) return; @@ -1577,13 +1618,19 @@ static void __cvmx_usb_start_channel(struct cvmx_usb_internal_state *usb, usbc_hcintmsk.u32 = 0; usbc_hcintmsk.s.chhltdmsk = 1; if (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA) { - /* Channels need these extra interrupts when we aren't in DMA mode */ + /* + * Channels need these extra interrupts when we aren't + * in DMA mode. + */ usbc_hcintmsk.s.datatglerrmsk = 1; usbc_hcintmsk.s.frmovrunmsk = 1; usbc_hcintmsk.s.bblerrmsk = 1; usbc_hcintmsk.s.xacterrmsk = 1; if (__cvmx_usb_pipe_needs_split(usb, pipe)) { - /* Splits don't generate xfercompl, so we need ACK and NYET */ + /* + * Splits don't generate xfercompl, so we need + * ACK and NYET. + */ usbc_hcintmsk.s.nyetmsk = 1; usbc_hcintmsk.s.ackmsk = 1; } @@ -1677,18 +1724,22 @@ static void __cvmx_usb_start_channel(struct cvmx_usb_internal_state *usb, * begin or the entire payload */ if (bytes_to_transfer <= 188) - usbc_hcsplt.s.xactpos = 3; /* Entire payload in one go */ + /* Entire payload in one go */ + usbc_hcsplt.s.xactpos = 3; else - usbc_hcsplt.s.xactpos = 2; /* First part of payload */ + /* First part of payload */ + usbc_hcsplt.s.xactpos = 2; } else { /* * 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 */ + /* End of payload */ + usbc_hcsplt.s.xactpos = 1; else - usbc_hcsplt.s.xactpos = 0; /* Middle of payload */ + /* Middle of payload */ + usbc_hcsplt.s.xactpos = 0; } /* * Again, the transfer size is limited to 188 @@ -1870,7 +1921,10 @@ static void __cvmx_usb_schedule(struct cvmx_usb_internal_state *usb, int is_sof) enum cvmx_usb_transfer ttype; if (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA) { - /* Without DMA we need to be careful to not schedule something at the end of a frame and cause an overrun */ + /* + * Without DMA we need to be careful to not schedule something + * at the end of a frame and cause an overrun. + */ union cvmx_usbcx_hfnum hfnum = {.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HFNUM(usb->index))}; union cvmx_usbcx_hfir hfir = {.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HFIR(usb->index))}; if (hfnum.s.frrem < hfir.s.frint/4) @@ -2007,9 +2061,12 @@ static void __cvmx_usb_perform_complete(struct cvmx_usb_internal_state *usb, * 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 */ - transaction->iso_packets++; /* Increment to the next location in our packet array */ + /* No bytes transferred for this packet as of yet */ + transaction->actual_bytes = 0; + /* One less ISO waiting to transfer */ + transaction->iso_number_packets--; + /* Increment to the next location in our packet array */ + transaction->iso_packets++; transaction->stage = CVMX_USB_STAGE_NON_CONTROL; goto done; } @@ -2095,7 +2152,8 @@ static int __cvmx_usb_submit_transaction(struct cvmx_usb_internal_state *usb, transaction->buffer = buffer; transaction->buffer_length = buffer_length; transaction->control_header = control_header; - transaction->iso_start_frame = iso_start_frame; // FIXME: This is not used, implement it + /* FIXME: This is not used, implement it. */ + transaction->iso_start_frame = iso_start_frame; transaction->iso_number_packets = iso_number_packets; transaction->iso_packets = iso_packets; transaction->callback = callback; @@ -2406,7 +2464,8 @@ int cvmx_usb_submit_isochronous(struct cvmx_usb_state *state, int pipe_handle, * @pipe_handle: * Pipe handle to cancel requests in. * @submit_handle: - * Handle to transaction to cancel, returned by the submit function. + * Handle to transaction to cancel, returned by the submit + * function. * * Returns: 0 or a negative error code. */ @@ -2445,7 +2504,10 @@ int cvmx_usb_cancel(struct cvmx_usb_state *state, int pipe_handle, int submit_ha CVMX_SYNCW; usbc_hcchar.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCCHARX(pipe->channel, usb->index)); - /* If the channel isn't enabled then the transaction already completed */ + /* + * If the channel isn't enabled then the transaction already + * completed. + */ if (usbc_hcchar.s.chena) { usbc_hcchar.s.chdis = 1; __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCCHARX(pipe->channel, usb->index), usbc_hcchar.u32); @@ -2628,7 +2690,10 @@ static int __cvmx_usb_poll_channel(struct cvmx_usb_internal_state *usb, int chan __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCCHARX(channel, usb->index), usbc_hcchar.u32); return 0; } else if (usbc_hcint.s.xfercompl) { - /* Successful IN/OUT with transfer complete. Channel halt isn't needed */ + /* + * Successful IN/OUT with transfer complete. + * Channel halt isn't needed. + */ } else { cvmx_dprintf("USB%d: Channel %d interrupt without halt\n", usb->index, channel); return 0; @@ -2980,7 +3045,9 @@ static int __cvmx_usb_poll_channel(struct cvmx_usb_internal_state *usb, int chan break; } } else if (usbc_hcint.s.nak) { - /* 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; /* |