diff options
Diffstat (limited to 'drivers/usb/cdns3/gadget.c')
| -rw-r--r-- | drivers/usb/cdns3/gadget.c | 2319 |
1 files changed, 0 insertions, 2319 deletions
diff --git a/drivers/usb/cdns3/gadget.c b/drivers/usb/cdns3/gadget.c deleted file mode 100644 index 4e9e8e43f634..000000000000 --- a/drivers/usb/cdns3/gadget.c +++ /dev/null @@ -1,2319 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Cadence USBSS DRD Driver - gadget side. - * - * Copyright (C) 2018-2019 Cadence Design Systems. - * Copyright (C) 2017-2018 NXP - * - * Authors: Pawel Jez <pjez@cadence.com>, - * Pawel Laszczak <pawell@cadence.com> - * Peter Chen <peter.chen@nxp.com> - */ - -/* - * Work around 1: - * At some situations, the controller may get stale data address in TRB - * at below sequences: - * 1. Controller read TRB includes data address - * 2. Software updates TRBs includes data address and Cycle bit - * 3. Controller read TRB which includes Cycle bit - * 4. DMA run with stale data address - * - * To fix this problem, driver needs to make the first TRB in TD as invalid. - * After preparing all TRBs driver needs to check the position of DMA and - * if the DMA point to the first just added TRB and doorbell is 1, - * then driver must defer making this TRB as valid. This TRB will be make - * as valid during adding next TRB only if DMA is stopped or at TRBERR - * interrupt. - * - * Issue has been fixed in DEV_VER_V3 version of controller. - * - */ - -#include <linux/dma-mapping.h> -#include <linux/usb/gadget.h> -#include <linux/module.h> - -#include "core.h" -#include "gadget-export.h" -#include "gadget.h" -#include "trace.h" -#include "drd.h" - -static int __cdns3_gadget_ep_queue(struct usb_ep *ep, - struct usb_request *request, - gfp_t gfp_flags); - -/** - * cdns3_set_register_bit - set bit in given register. - * @ptr: address of device controller register to be read and changed - * @mask: bits requested to set - */ -void cdns3_set_register_bit(void __iomem *ptr, u32 mask) -{ - mask = readl(ptr) | mask; - writel(mask, ptr); -} - -/** - * cdns3_ep_addr_to_index - Macro converts endpoint address to - * index of endpoint object in cdns3_device.eps[] container - * @ep_addr: endpoint address for which endpoint object is required - * - */ -u8 cdns3_ep_addr_to_index(u8 ep_addr) -{ - return (((ep_addr & 0x7F)) + ((ep_addr & USB_DIR_IN) ? 16 : 0)); -} - -static int cdns3_get_dma_pos(struct cdns3_device *priv_dev, - struct cdns3_endpoint *priv_ep) -{ - int dma_index; - - dma_index = readl(&priv_dev->regs->ep_traddr) - priv_ep->trb_pool_dma; - - return dma_index / TRB_SIZE; -} - -/** - * cdns3_next_request - returns next request from list - * @list: list containing requests - * - * Returns request or NULL if no requests in list - */ -struct usb_request *cdns3_next_request(struct list_head *list) -{ - return list_first_entry_or_null(list, struct usb_request, list); -} - -/** - * cdns3_next_align_buf - returns next buffer from list - * @list: list containing buffers - * - * Returns buffer or NULL if no buffers in list - */ -struct cdns3_aligned_buf *cdns3_next_align_buf(struct list_head *list) -{ - return list_first_entry_or_null(list, struct cdns3_aligned_buf, list); -} - -/** - * select_ep - selects endpoint - * @priv_dev: extended gadget object - * @ep: endpoint address - */ -void cdns3_select_ep(struct cdns3_device *priv_dev, u32 ep) -{ - if (priv_dev->selected_ep == ep) - return; - - priv_dev->selected_ep = ep; - writel(ep, &priv_dev->regs->ep_sel); -} - -dma_addr_t cdns3_trb_virt_to_dma(struct cdns3_endpoint *priv_ep, - struct cdns3_trb *trb) -{ - u32 offset = (char *)trb - (char *)priv_ep->trb_pool; - - return priv_ep->trb_pool_dma + offset; -} - -int cdns3_ring_size(struct cdns3_endpoint *priv_ep) -{ - switch (priv_ep->type) { - case USB_ENDPOINT_XFER_ISOC: - return TRB_ISO_RING_SIZE; - case USB_ENDPOINT_XFER_CONTROL: - return TRB_CTRL_RING_SIZE; - default: - return TRB_RING_SIZE; - } -} - -/** - * cdns3_allocate_trb_pool - Allocates TRB's pool for selected endpoint - * @priv_ep: endpoint object - * - * Function will return 0 on success or -ENOMEM on allocation error - */ -int cdns3_allocate_trb_pool(struct cdns3_endpoint *priv_ep) -{ - struct cdns3_device *priv_dev = priv_ep->cdns3_dev; - int ring_size = cdns3_ring_size(priv_ep); - struct cdns3_trb *link_trb; - - if (!priv_ep->trb_pool) { - priv_ep->trb_pool = dma_alloc_coherent(priv_dev->sysdev, - ring_size, - &priv_ep->trb_pool_dma, - GFP_DMA32 | GFP_ATOMIC); - if (!priv_ep->trb_pool) - return -ENOMEM; - } else { - memset(priv_ep->trb_pool, 0, ring_size); - } - - if (!priv_ep->num) - return 0; - - priv_ep->num_trbs = ring_size / TRB_SIZE; - /* Initialize the last TRB as Link TRB */ - link_trb = (priv_ep->trb_pool + (priv_ep->num_trbs - 1)); - link_trb->buffer = TRB_BUFFER(priv_ep->trb_pool_dma); - link_trb->control = TRB_CYCLE | TRB_TYPE(TRB_LINK) | TRB_TOGGLE; - - return 0; -} - -static void cdns3_free_trb_pool(struct cdns3_endpoint *priv_ep) -{ - struct cdns3_device *priv_dev = priv_ep->cdns3_dev; - - if (priv_ep->trb_pool) { - dma_free_coherent(priv_dev->sysdev, - cdns3_ring_size(priv_ep), - priv_ep->trb_pool, priv_ep->trb_pool_dma); - priv_ep->trb_pool = NULL; - } -} - -/** - * cdns3_ep_stall_flush - Stalls and flushes selected endpoint - * @priv_ep: endpoint object - * - * Endpoint must be selected before call to this function - */ -static void cdns3_ep_stall_flush(struct cdns3_endpoint *priv_ep) -{ - struct cdns3_device *priv_dev = priv_ep->cdns3_dev; - - cdns3_dbg(priv_ep->cdns3_dev, "Stall & flush endpoint %s\n", - priv_ep->name); - - writel(EP_CMD_DFLUSH | EP_CMD_ERDY | EP_CMD_SSTALL, - &priv_dev->regs->ep_cmd); - - /* wait for DFLUSH cleared */ - cdns3_handshake(&priv_dev->regs->ep_cmd, EP_CMD_DFLUSH, 0, 1000); - priv_ep->flags |= EP_STALL; -} - -/** - * cdns3_hw_reset_eps_config - reset endpoints configuration kept by controller. - * @priv_dev: extended gadget object - */ -void cdns3_hw_reset_eps_config(struct cdns3_device *priv_dev) -{ - writel(USB_CONF_CFGRST, &priv_dev->regs->usb_conf); - - cdns3_allow_enable_l1(priv_dev, 0); - priv_dev->hw_configured_flag = 0; - priv_dev->onchip_used_size = 0; - priv_dev->out_mem_is_allocated = 0; - priv_dev->wait_for_setup = 0; -} - -/** - * cdns3_ep_inc_trb - increment a trb index. - * @index: Pointer to the TRB index to increment. - * @cs: Cycle state - * @trb_in_seg: number of TRBs in segment - * - * The index should never point to the link TRB. After incrementing, - * if it is point to the link TRB, wrap around to the beginning and revert - * cycle state bit The - * link TRB is always at the last TRB entry. - */ -static void cdns3_ep_inc_trb(int *index, u8 *cs, int trb_in_seg) -{ - (*index)++; - if (*index == (trb_in_seg - 1)) { - *index = 0; - *cs ^= 1; - } -} - -/** - * cdns3_ep_inc_enq - increment endpoint's enqueue pointer - * @priv_ep: The endpoint whose enqueue pointer we're incrementing - */ -static void cdns3_ep_inc_enq(struct cdns3_endpoint *priv_ep) -{ - priv_ep->free_trbs--; - cdns3_ep_inc_trb(&priv_ep->enqueue, &priv_ep->pcs, priv_ep->num_trbs); -} - -/** - * cdns3_ep_inc_deq - increment endpoint's dequeue pointer - * @priv_ep: The endpoint whose dequeue pointer we're incrementing - */ -static void cdns3_ep_inc_deq(struct cdns3_endpoint *priv_ep) -{ - priv_ep->free_trbs++; - cdns3_ep_inc_trb(&priv_ep->dequeue, &priv_ep->ccs, priv_ep->num_trbs); -} - -void cdns3_move_deq_to_next_trb(struct cdns3_request *priv_req) -{ - struct cdns3_endpoint *priv_ep = priv_req->priv_ep; - int current_trb = priv_req->start_trb; - - while (current_trb != priv_req->end_trb) { - cdns3_ep_inc_deq(priv_ep); - current_trb = priv_ep->dequeue; - } - - cdns3_ep_inc_deq(priv_ep); -} - -/** - * cdns3_allow_enable_l1 - enable/disable permits to transition to L1. - * @priv_dev: Extended gadget object - * @enable: Enable/disable permit to transition to L1. - * - * If bit USB_CONF_L1EN is set and device receive Extended Token packet, - * then controller answer with ACK handshake. - * If bit USB_CONF_L1DS is set and device receive Extended Token packet, - * then controller answer with NYET handshake. - */ -void cdns3_allow_enable_l1(struct cdns3_device *priv_dev, int enable) -{ - if (enable) - writel(USB_CONF_L1EN, &priv_dev->regs->usb_conf); - else - writel(USB_CONF_L1DS, &priv_dev->regs->usb_conf); -} - -enum usb_device_speed cdns3_get_speed(struct cdns3_device *priv_dev) -{ - u32 reg; - - reg = readl(&priv_dev->regs->usb_sts); - - if (DEV_SUPERSPEED(reg)) - return USB_SPEED_SUPER; - else if (DEV_HIGHSPEED(reg)) - return USB_SPEED_HIGH; - else if (DEV_FULLSPEED(reg)) - return USB_SPEED_FULL; - else if (DEV_LOWSPEED(reg)) - return USB_SPEED_LOW; - return USB_SPEED_UNKNOWN; -} - -/** - * cdns3_start_all_request - add to ring all request not started - * @priv_dev: Extended gadget object - * @priv_ep: The endpoint for whom request will be started. - * - * Returns return ENOMEM if transfer ring i not enough TRBs to start - * all requests. - */ -static int cdns3_start_all_request(struct cdns3_device *priv_dev, - struct cdns3_endpoint *priv_ep) -{ - struct cdns3_request *priv_req; - struct usb_request *request; - int ret = 0; - - while (!list_empty(&priv_ep->deferred_req_list)) { - request = cdns3_next_request(&priv_ep->deferred_req_list); - priv_req = to_cdns3_request(request); - - ret = cdns3_ep_run_transfer(priv_ep, request); - if (ret) - return ret; - - list_del(&request->list); - list_add_tail(&request->list, - &priv_ep->pending_req_list); - } - - priv_ep->flags &= ~EP_RING_FULL; - return ret; -} - -/** - * cdns3_gadget_giveback - call struct usb_request's ->complete callback - * @priv_ep: The endpoint to whom the request belongs to - * @priv_req: The request we're giving back - * @status: completion code for the request - * - * Must be called with controller's lock held and interrupts disabled. This - * function will unmap @req and call its ->complete() callback to notify upper - * layers that it has completed. - */ -void cdns3_gadget_giveback(struct cdns3_endpoint *priv_ep, - struct cdns3_request *priv_req, - int status) -{ - struct cdns3_device *priv_dev = priv_ep->cdns3_dev; - struct usb_request *request = &priv_req->request; - - list_del_init(&request->list); - - if (request->status == -EINPROGRESS) - request->status = status; - - usb_gadget_unmap_request_by_dev(priv_dev->sysdev, request, - priv_ep->dir); - - if ((priv_req->flags & REQUEST_UNALIGNED) && - priv_ep->dir == USB_DIR_OUT && !request->status) - memcpy(request->buf, priv_req->aligned_buf->buf, - request->length); - - priv_req->flags &= ~(REQUEST_PENDING | REQUEST_UNALIGNED); - trace_cdns3_gadget_giveback(priv_req); - - if (request->complete) { - spin_unlock(&priv_dev->lock); - usb_gadget_giveback_request(&priv_ep->endpoint, - request); - spin_lock(&priv_dev->lock); - } - - if (request->buf == priv_dev->zlp_buf) - cdns3_gadget_ep_free_request(&priv_ep->endpoint, request); -} - -void cdns3_wa1_restore_cycle_bit(struct cdns3_endpoint *priv_ep) -{ - struct cdns3_device *priv_dev = priv_ep->cdns3_dev; - - /* Work around for stale data address in TRB*/ - if (priv_ep->wa1_set) { - cdns3_dbg(priv_dev, "WA1: update cycle bit\n"); - priv_ep->wa1_set = 0; - priv_ep->wa1_trb_index = 0xFFFF; - if (priv_ep->wa1_cycle_bit) { - priv_ep->wa1_trb->control = - priv_ep->wa1_trb->control | 0x1; - } else { - priv_ep->wa1_trb->control = - priv_ep->wa1_trb->control & ~0x1; - } - } -} - -static int cdns3_prepare_aligned_request_buf(struct cdns3_request *priv_req) -{ - struct cdns3_endpoint *priv_ep = priv_req->priv_ep; - struct cdns3_device *priv_dev = priv_ep->cdns3_dev; - struct cdns3_aligned_buf *buf; - - /* check if buffer is aligned to 8. */ - if (!((uintptr_t)priv_req->request.buf & 0x7)) - return 0; - - buf = priv_req->aligned_buf; - - if (!buf || priv_req->request.length > buf->size) { - buf = kzalloc(sizeof(*buf), GFP_ATOMIC); - if (!buf) - return -ENOMEM; - - buf->size = priv_req->request.length; - - buf->buf = dma_alloc_coherent(priv_dev->sysdev, - buf->size, - &buf->dma, - GFP_ATOMIC); - if (!buf->buf) { - kfree(buf); - return -ENOMEM; - } - - if (priv_req->aligned_buf) { - trace_cdns3_free_aligned_request(priv_req); - priv_req->aligned_buf->in_use = 0; - priv_dev->run_garbage_colector = 1; - } - - buf->in_use = 1; - priv_req->aligned_buf = buf; - - list_add_tail(&buf->list, - &priv_dev->aligned_buf_list); - } - - if (priv_ep->dir == USB_DIR_IN) { - memcpy(buf->buf, priv_req->request.buf, - priv_req->request.length); - } - - priv_req->flags |= REQUEST_UNALIGNED; - trace_cdns3_prepare_aligned_request(priv_req); - - return 0; -} - -static int cdns3_wa1_update_guard(struct cdns3_endpoint *priv_ep, - struct cdns3_trb *trb) -{ - struct cdns3_device *priv_dev = priv_ep->cdns3_dev; - - if (!priv_ep->wa1_set) { - u32 doorbell; - - doorbell = !!(readl(&priv_dev->regs->ep_cmd) & EP_CMD_DRDY); - - if (doorbell) { - priv_ep->wa1_cycle_bit = priv_ep->pcs ? TRB_CYCLE : 0; - priv_ep->wa1_set = 1; - priv_ep->wa1_trb = trb; - priv_ep->wa1_trb_index = priv_ep->enqueue; - cdns3_dbg(priv_dev, "WA1 set guard\n"); - return 0; - } - } - return 1; -} - -static void cdns3_wa1_tray_restore_cycle_bit(struct cdns3_device *priv_dev, - struct cdns3_endpoint *priv_ep) -{ - int dma_index; - u32 doorbell; - - doorbell = !!(readl(&priv_dev->regs->ep_cmd) & EP_CMD_DRDY); - dma_index = cdns3_get_dma_pos(priv_dev, priv_ep); - - if (!doorbell || dma_index != priv_ep->wa1_trb_index) - cdns3_wa1_restore_cycle_bit(priv_ep); -} - -/** - * cdns3_ep_run_transfer - start transfer on no-default endpoint hardware - * @priv_ep: endpoint object - * - * Returns zero on success or negative value on failure - */ -int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep, - struct usb_request *request) -{ - struct cdns3_device *priv_dev = priv_ep->cdns3_dev; - struct cdns3_request *priv_req; - struct cdns3_trb *trb; - dma_addr_t trb_dma; - u32 togle_pcs = 1; - int sg_iter = 0; - int num_trb; - int address; - u32 control; - int pcs; - - if (priv_ep->type == USB_ENDPOINT_XFER_ISOC) - num_trb = priv_ep->interval; - else - num_trb = request->num_sgs ? request->num_sgs : 1; - - if (num_trb > priv_ep->free_trbs) { - priv_ep->flags |= EP_RING_FULL; - return -ENOBUFS; - } - - priv_req = to_cdns3_request(request); - address = priv_ep->endpoint.desc->bEndpointAddress; - - priv_ep->flags |= EP_PENDING_REQUEST; - - /* must allocate buffer aligned to 8 */ - if (priv_req->flags & REQUEST_UNALIGNED) - trb_dma = priv_req->aligned_buf->dma; - else - trb_dma = request->dma; - - trb = priv_ep->trb_pool + priv_ep->enqueue; - priv_req->start_trb = priv_ep->enqueue; - priv_req->trb = trb; - - cdns3_select_ep(priv_ep->cdns3_dev, address); - - /* prepare ring */ - if ((priv_ep->enqueue + num_trb) >= (priv_ep->num_trbs - 1)) { - struct cdns3_trb *link_trb; - int doorbell, dma_index; - u32 ch_bit = 0; - - doorbell = !!(readl(&priv_dev->regs->ep_cmd) & EP_CMD_DRDY); - dma_index = cdns3_get_dma_pos(priv_dev, priv_ep); - - /* Driver can't update LINK TRB if it is current processed. */ - if (doorbell && dma_index == priv_ep->num_trbs - 1) { - priv_ep->flags |= EP_DEFERRED_DRDY; - return -ENOBUFS; - } - - /*updating C bt in Link TRB before starting DMA*/ - link_trb = priv_ep->trb_pool + (priv_ep->num_trbs - 1); - /* - * For TRs size equal 2 enabling TRB_CHAIN for epXin causes - * that DMA stuck at the LINK TRB. - * On the other hand, removing TRB_CHAIN for longer TRs for - * epXout cause that DMA stuck after handling LINK TRB. - * To eliminate this strange behavioral driver set TRB_CHAIN - * bit only for TR size > 2. - */ - if (priv_ep->type == USB_ENDPOINT_XFER_ISOC || - TRBS_PER_SEGMENT > 2) - ch_bit = TRB_CHAIN; - - link_trb->control = ((priv_ep->pcs) ? TRB_CYCLE : 0) | - TRB_TYPE(TRB_LINK) | TRB_TOGGLE | ch_bit; - } - - if (priv_dev->dev_ver <= DEV_VER_V2) - togle_pcs = cdns3_wa1_update_guard(priv_ep, trb); - - /* set incorrect Cycle Bit for first trb*/ - control = priv_ep->pcs ? 0 : TRB_CYCLE; - - do { - u32 length; - u16 td_size = 0; - - /* fill TRB */ - control |= TRB_TYPE(TRB_NORMAL); - trb->buffer = TRB_BUFFER(request->num_sgs == 0 - ? trb_dma : request->sg[sg_iter].dma_address); - - if (likely(!request->num_sgs)) - length = request->length; - else - length = request->sg[sg_iter].length; - - if (likely(priv_dev->dev_ver >= DEV_VER_V2)) - td_size = DIV_ROUND_UP(length, - priv_ep->endpoint.maxpacket); - - trb->length = TRB_BURST_LEN(priv_ep->trb_burst_size) | - TRB_LEN(length); - if (priv_dev->gadget.speed == USB_SPEED_SUPER) - trb->length |= TRB_TDL_SS_SIZE(td_size); - else - control |= TRB_TDL_HS_SIZE(td_size); - - pcs = priv_ep->pcs ? TRB_CYCLE : 0; - - /* - * first trb should be prepared as last to avoid processing - * transfer to early - */ - if (sg_iter != 0) - control |= pcs; - - if (priv_ep->type == USB_ENDPOINT_XFER_ISOC && !priv_ep->dir) { - control |= TRB_IOC | TRB_ISP; - } else { - /* for last element in TD or in SG list */ - if (sg_iter == (num_trb - 1) && sg_iter != 0) - control |= pcs | TRB_IOC | TRB_ISP; - } - - if (sg_iter) - trb->control = control; - else - priv_req->trb->control = control; - - control = 0; - ++sg_iter; - priv_req->end_trb = priv_ep->enqueue; - cdns3_ep_inc_enq(priv_ep); - trb = priv_ep->trb_pool + priv_ep->enqueue; - } while (sg_iter < num_trb); - - trb = priv_req->trb; - - priv_req->flags |= REQUEST_PENDING; - - if (sg_iter == 1) - trb->control |= TRB_IOC | TRB_ISP; - /* - * Memory barrier - cycle bit must be set before other filds in trb. - */ - wmb(); - - /* give the TD to the consumer*/ - if (togle_pcs) - trb->control = trb->control ^ 1; - - if (priv_dev->dev_ver <= DEV_VER_V2) - cdns3_wa1_tray_restore_cycle_bit(priv_dev, priv_ep); - - trace_cdns3_prepare_trb(priv_ep, priv_req->trb); - - /* - * Memory barrier - Cycle Bit must be set before trb->length and - * trb->buffer fields. - */ - wmb(); - - /* - * For DMULT mode we can set address to transfer ring only once after - * enabling endpoint. - */ - if (priv_ep->flags & EP_UPDATE_EP_TRBADDR) { - /* - * Until SW is not ready to handle the OUT transfer the ISO OUT - * Endpoint should be disabled (EP_CFG.ENABLE = 0). - * EP_CFG_ENABLE must be set before updating ep_traddr. - */ - if (priv_ep->type == USB_ENDPOINT_XFER_ISOC && !priv_ep->dir && - !(priv_ep->flags & EP_QUIRK_ISO_OUT_EN)) { - priv_ep->flags |= EP_QUIRK_ISO_OUT_EN; - cdns3_set_register_bit(&priv_dev->regs->ep_cfg, - EP_CFG_ENABLE); - } - - writel(EP_TRADDR_TRADDR(priv_ep->trb_pool_dma + - priv_req->start_trb * TRB_SIZE), - &priv_dev->regs->ep_traddr); - - cdns3_dbg(priv_ep->cdns3_dev, "Update ep_trbaddr for %s to %08x\n", - priv_ep->name, readl(&priv_dev->regs->ep_traddr)); - - priv_ep->flags &= ~EP_UPDATE_EP_TRBADDR; - } - - if (!priv_ep->wa1_set && !(priv_ep->flags & EP_STALL)) { - trace_cdns3_ring(priv_ep); - /*clearing TRBERR and EP_STS_DESCMIS before seting DRDY*/ - writel(EP_STS_TRBERR | EP_STS_DESCMIS, &priv_dev->regs->ep_sts); - writel(EP_CMD_DRDY, &priv_dev->regs->ep_cmd); - trace_cdns3_doorbell_epx(priv_ep->name, - readl(&priv_dev->regs->ep_traddr)); - } - - /* WORKAROUND for transition to L0 */ - __cdns3_gadget_wakeup(priv_dev); - - return 0; -} - -void cdns3_set_hw_configuration(struct cdns3_device *priv_dev) -{ - struct cdns3_endpoint *priv_ep; - struct usb_ep *ep; - int result = 0; - - if (priv_dev->hw_configured_flag) - return; - - writel(USB_CONF_CFGSET, &priv_dev->regs->usb_conf); - writel(EP_CMD_ERDY | EP_CMD_REQ_CMPL, &priv_dev->regs->ep_cmd); - - cdns3_set_register_bit(&priv_dev->regs->usb_conf, - USB_CONF_U1EN | USB_CONF_U2EN); - - /* wait until configuration set */ - result = cdns3_handshake(&priv_dev->regs->usb_sts, - USB_STS_CFGSTS_MASK, 1, 100); - - priv_dev->hw_configured_flag = 1; - - list_for_each_entry(ep, &priv_dev->gadget.ep_list, ep_list) { - if (ep->enabled) { - priv_ep = ep_to_cdns3_ep(ep); - cdns3_start_all_request(priv_dev, priv_ep); - } - } -} - -/** - * cdns3_request_handled - check whether request has been handled by DMA - * - * @priv_ep: extended endpoint object. - * @priv_req: request object for checking - * - * Endpoint must be selected before invoking this function. - * - * Returns false if request has not been handled by DMA, else returns true. - * - * SR - start ring - * ER - end ring - * DQ = priv_ep->dequeue - dequeue position - * EQ = priv_ep->enqueue - enqueue position - * ST = priv_req->start_trb - index of first TRB in transfer ring - * ET = priv_req->end_trb - index of last TRB in transfer ring - * CI = current_index - index of processed TRB by DMA. - * - * As first step, function checks if cycle bit for priv_req->start_trb is - * correct. - * - * some rules: - * 1. priv_ep->dequeue never exceed current_index. - * 2 priv_ep->enqueue never exceed priv_ep->dequeue - * 3. exception: priv_ep->enqueue == priv_ep->dequeue - * and priv_ep->free_trbs is zero. - * This case indicate that TR is full. - * - * Then We can split recognition into two parts: - * Case 1 - priv_ep->dequeue < current_index - * SR ... EQ ... DQ ... CI ... ER - * SR ... DQ ... CI ... EQ ... ER - * - * Request has been handled by DMA if ST and ET is between DQ and CI. - * - * Case 2 - priv_ep->dequeue > current_index - * This situation take place when CI go through the LINK TRB at the end of - * transfer ring. - * SR ... CI ... EQ ... DQ ... ER - * - * Request has been handled by DMA if ET is less then CI or - * ET is greater or equal DQ. - */ -static bool cdns3_request_handled(struct cdns3_endpoint *priv_ep, - struct cdns3_request *priv_req) -{ - struct cdns3_device *priv_dev = priv_ep->cdns3_dev; - struct cdns3_trb *trb = priv_req->trb; - int current_index = 0; - int handled = 0; - int doorbell; - - current_index = cdns3_get_dma_pos(priv_dev, priv_ep); - doorbell = !!(readl(&priv_dev->regs->ep_cmd) & EP_CMD_DRDY); - - trb = &priv_ep->trb_pool[priv_req->start_trb]; - - if ((trb->control & TRB_CYCLE) != priv_ep->ccs) - goto finish; - - if (doorbell == 1 && current_index == priv_ep->dequeue) - goto finish; - - /* The corner case for TRBS_PER_SEGMENT equal 2). */ - if (TRBS_PER_SEGMENT == 2 && priv_ep->type != USB_ENDPOINT_XFER_ISOC) { - handled = 1; - goto finish; - } - - if (priv_ep->enqueue == priv_ep->dequeue && - priv_ep->free_trbs == 0) { - handled = 1; - } else if (priv_ep->dequeue < current_index) { - if ((current_index == (priv_ep->num_trbs - 1)) && - !priv_ep->dequeue) - goto finish; - - if (priv_req->end_trb >= priv_ep->dequeue && - priv_req->end_trb < current_index) - handled = 1; - } else if (priv_ep->dequeue > current_index) { - if (priv_req->end_trb < current_index || - priv_req->end_trb >= priv_ep->dequeue) - handled = 1; - } - -finish: - trace_cdns3_request_handled(priv_req, current_index, handled); - - return handled; -} - -static void cdns3_transfer_completed(struct cdns3_device *priv_dev, - struct cdns3_endpoint *priv_ep) -{ - struct cdns3_request *priv_req; - struct usb_request *request; - struct cdns3_trb *trb; - - while (!list_empty(&priv_ep->pending_req_list)) { - request = cdns3_next_request(&priv_ep->pending_req_list); - priv_req = to_cdns3_request(request); - - /* Re-select endpoint. It could be changed by other CPU during - * handling usb_gadget_giveback_request. - */ - cdns3_select_ep(priv_dev, priv_ep->endpoint.address); - - if (!cdns3_request_handled(priv_ep, priv_req)) - goto prepare_next_td; - - trb = priv_ep->trb_pool + priv_ep->dequeue; - trace_cdns3_complete_trb(priv_ep, trb); - - if (trb != priv_req->trb) - dev_warn(priv_dev->dev, - "request_trb=0x%p, queue_trb=0x%p\n", - priv_req->trb, trb); - - request->actual = TRB_LEN(le32_to_cpu(trb->length)); - cdns3_move_deq_to_next_trb(priv_req); - cdns3_gadget_giveback(priv_ep, priv_req, 0); - - if (priv_ep->type != USB_ENDPOINT_XFER_ISOC && - TRBS_PER_SEGMENT == 2) - break; - } - priv_ep->flags &= ~EP_PENDING_REQUEST; - -prepare_next_td: - cdns3_start_all_request(priv_dev, priv_ep); -} - -void cdns3_rearm_transfer(struct cdns3_endpoint *priv_ep, u8 rearm) -{ - struct cdns3_device *priv_dev = priv_ep->cdns3_dev; - - cdns3_wa1_restore_cycle_bit(priv_ep); - - if (rearm) { - trace_cdns3_ring(priv_ep); - - /* Cycle Bit must be updated before arming DMA. */ - wmb(); - writel(EP_CMD_DRDY, &priv_dev->regs->ep_cmd); - - __cdns3_gadget_wakeup(priv_dev); - - trace_cdns3_doorbell_epx(priv_ep->name, - readl(&priv_dev->regs->ep_traddr)); - } -} - -/** - * cdns3_check_ep_interrupt_proceed - Processes interrupt related to endpoint - * @priv_ep: endpoint object - * - * Returns 0 - */ -static int cdns3_check_ep_interrupt_proceed(struct cdns3_endpoint *priv_ep) -{ - struct cdns3_device *priv_dev = priv_ep->cdns3_dev; - u32 ep_sts_reg; - - cdns3_select_ep(priv_dev, priv_ep->endpoint.address); - - trace_cdns3_epx_irq(priv_dev, priv_ep); - - ep_sts_reg = readl(&priv_dev->regs->ep_sts); - writel(ep_sts_reg, &priv_dev->regs->ep_sts); - - if (ep_sts_reg & EP_STS_TRBERR) { - /* - * For isochronous transfer driver completes request on - * IOC or on TRBERR. IOC appears only when device receive - * OUT data packet. If host disable stream or lost some packet - * then the only way to finish all queued transfer is to do it - * on TRBERR event. - */ - if (priv_ep->type == USB_ENDPOINT_XFER_ISOC && - !priv_ep->wa1_set) { - if (!priv_ep->dir) { - u32 ep_cfg = readl(&priv_dev->regs->ep_cfg); - - ep_cfg &= ~EP_CFG_ENABLE; - writel(ep_cfg, &priv_dev->regs->ep_cfg); - priv_ep->flags &= ~EP_QUIRK_ISO_OUT_EN; - } - cdns3_transfer_completed(priv_dev, priv_ep); - } else { - if (priv_ep->flags & EP_DEFERRED_DRDY) { - priv_ep->flags &= ~EP_DEFERRED_DRDY; - cdns3_start_all_request(priv_dev, priv_ep); - } else { - cdns3_rearm_transfer(priv_ep, priv_ep->wa1_set); - } - } - } - - if ((ep_sts_reg & EP_STS_IOC) || (ep_sts_reg & EP_STS_ISP)) - cdns3_transfer_completed(priv_dev, priv_ep); - - return 0; -} - -/** - * cdns3_check_usb_interrupt_proceed - Processes interrupt related to device - * @priv_dev: extended gadget object - * @usb_ists: bitmap representation of device's reported interrupts - * (usb_ists register value) - */ -static void cdns3_check_usb_interrupt_proceed(struct cdns3_device *priv_dev, - u32 usb_ists) -{ - int speed = 0; - - trace_cdns3_usb_irq(priv_dev, usb_ists); - if (usb_ists & USB_ISTS_L1ENTI) { - /* - * WORKAROUND: CDNS3 controller has issue with hardware resuming - * from L1. To fix it, if any DMA transfer is pending driver - * must starts driving resume signal immediately. - */ - if (readl(&priv_dev->regs->drbl)) - __cdns3_gadget_wakeup(priv_dev); - } - - /* Connection detected */ - if (usb_ists & (USB_ISTS_CON2I | USB_ISTS_CONI)) { - speed = cdns3_get_speed(priv_dev); - priv_dev->gadget.speed = speed; - usb_gadget_set_state(&priv_dev->gadget, USB_STATE_POWERED); - cdns3_ep0_config(priv_dev); - } - - /* Disconnection detected */ - if (usb_ists & (USB_ISTS_DIS2I | USB_ISTS_DISI)) { - if (priv_dev->gadget_driver && - priv_dev->gadget_driver->disconnect) { - spin_unlock(&priv_dev->lock); - priv_dev->gadget_driver->disconnect(&priv_dev->gadget); - spin_lock(&priv_dev->lock); - } - - priv_dev->gadget.speed = USB_SPEED_UNKNOWN; - usb_gadget_set_state(&priv_dev->gadget, USB_STATE_NOTATTACHED); - cdns3_hw_reset_eps_config(priv_dev); - } - - if (usb_ists & (USB_ISTS_L2ENTI | USB_ISTS_U3ENTI)) { - if (priv_dev->gadget_driver && - priv_dev->gadget_driver->suspend) { - spin_unlock(&priv_dev->lock); - priv_dev->gadget_driver->suspend(&priv_dev->gadget); - spin_lock(&priv_dev->lock); - } - } - - if (usb_ists & (USB_ISTS_L2EXTI | USB_ISTS_U3EXTI)) { - if (priv_dev->gadget_driver && - priv_dev->gadget_driver->resume) { - spin_unlock(&priv_dev->lock); - priv_dev->gadget_driver->resume(&priv_dev->gadget); - spin_lock(&priv_dev->lock); - } - } - - /* reset*/ - if (usb_ists & (USB_ISTS_UWRESI | USB_ISTS_UHRESI | USB_ISTS_U2RESI)) { - if (priv_dev->gadget_driver) { - spin_unlock(&priv_dev->lock); - usb_gadget_udc_reset(&priv_dev->gadget, - priv_dev->gadget_driver); - spin_lock(&priv_dev->lock); - - /*read again to check the actual speed*/ - speed = cdns3_get_speed(priv_dev); - priv_dev->gadget.speed = speed; - cdns3_hw_reset_eps_config(priv_dev); - cdns3_ep0_config(priv_dev); - } - } -} - -/** - * cdns3_device_irq_handler- interrupt handler for device part of controller - * - * @irq: irq number for cdns3 core device - * @data: structure of cdns3 - * - * Returns IRQ_HANDLED or IRQ_NONE - */ -static irqreturn_t cdns3_device_irq_handler(int irq, void *data) -{ - struct cdns3_device *priv_dev; - struct cdns3 *cdns = data; - irqreturn_t ret = IRQ_NONE; - unsigned long flags; - u32 reg; - - priv_dev = cdns->gadget_dev; - spin_lock_irqsave(&priv_dev->lock, flags); - - /* check USB device interrupt */ - reg = readl(&priv_dev->regs->usb_ists); - - if (reg) { - writel(reg, &priv_dev->regs->usb_ists); - cdns3_check_usb_interrupt_proceed(priv_dev, reg); - ret = IRQ_HANDLED; - } - - /* check endpoint interrupt */ - reg = readl(&priv_dev->regs->ep_ists); - - if (reg) { - priv_dev->shadow_ep_en |= reg; - reg = ~reg & readl(&priv_dev->regs->ep_ien); - /* mask deferred interrupt. */ - writel(reg, &priv_dev->regs->ep_ien); - ret = IRQ_WAKE_THREAD; - } - - spin_unlock_irqrestore(&priv_dev->lock, flags); - return ret; -} - -/** - * cdns3_device_thread_irq_handler- interrupt handler for device part - * of controller - * - * @irq: irq number for cdns3 core device - * @data: structure of cdns3 - * - * Returns IRQ_HANDLED or IRQ_NONE - */ -static irqreturn_t cdns3_device_thread_irq_handler(int irq, void *data) -{ - struct cdns3_device *priv_dev; - struct cdns3 *cdns = data; - irqreturn_t ret = IRQ_NONE; - unsigned long flags; - u32 ep_ien; - int bit; - u32 reg; - - priv_dev = cdns->gadget_dev; - spin_lock_irqsave(&priv_dev->lock, flags); - - reg = readl(&priv_dev->regs->ep_ists); - - /* handle default endpoint OUT */ - if (reg & EP_ISTS_EP_OUT0) { - cdns3_check_ep0_interrupt_proceed(priv_dev, USB_DIR_OUT); - ret = IRQ_HANDLED; - } - - /* handle default endpoint IN */ - if (reg & EP_ISTS_EP_IN0) { - cdns3_check_ep0_interrupt_proceed(priv_dev, USB_DIR_IN); - ret = IRQ_HANDLED; - } - - /* check if interrupt from non default endpoint, if no exit */ - reg &= ~(EP_ISTS_EP_OUT0 | EP_ISTS_EP_IN0); - if (!reg) - goto irqend; - - for_each_set_bit(bit, (unsigned long *)®, - sizeof(u32) * BITS_PER_BYTE) { - priv_dev->shadow_ep_en |= BIT(bit); - cdns3_check_ep_interrupt_proceed(priv_dev->eps[bit]); - ret = IRQ_HANDLED; - } - - if (priv_dev->run_garbage_colector) { - struct cdns3_aligned_buf *buf, *tmp; - - list_for_each_entry_safe(buf, tmp, &priv_dev->aligned_buf_list, - list) { - if (!buf->in_use) { - list_del(&buf->list); - - spin_unlock_irqrestore(&priv_dev->lock, flags); - dma_free_coherent(priv_dev->sysdev, buf->size, - buf->buf, - buf->dma); - spin_lock_irqsave(&priv_dev->lock, flags); - - kfree(buf); - } - } - - priv_dev->run_garbage_colector = 0; - } - -irqend: - ep_ien = readl(&priv_dev->regs->ep_ien) | priv_dev->shadow_ep_en; - priv_dev->shadow_ep_en = 0; - /* Unmask all handled EP interrupts */ - writel(ep_ien, &priv_dev->regs->ep_ien); - spin_unlock_irqrestore(&priv_dev->lock, flags); - return ret; -} - -/** - * cdns3_ep_onchip_buffer_reserve - Try to reserve onchip buf for EP - * - * The real reservation will occur during write to EP_CFG register, - * this function is used to check if the 'size' reservation is allowed. - * - * @priv_dev: extended gadget object - * @size: the size (KB) for EP would like to allocate - * @is_in: endpoint direction - * - * Return 0 if the required size can met or negative value on failure - */ -static int cdns3_ep_onchip_buffer_reserve(struct cdns3_device *priv_dev, - int size, int is_in) -{ - int remained; - - /* 2KB are reserved for EP0*/ - remained = priv_dev->onchip_buffers - priv_dev->onchip_used_size - 2; - - if (is_in) { - if (remained < size) - return -EPERM; - - priv_dev->onchip_used_size += size; - } else { - int required; - - /** - * ALL OUT EPs are shared the same chunk onchip memory, so - * driver checks if it already has assigned enough |