Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Benjamin Herrenschmidt | 1820 | 100.00% | 1 | 100.00% |
Total | 1820 | 1 |
// SPDX-License-Identifier: GPL-2.0+ /* * aspeed-vhub -- Driver for Aspeed SoC "vHub" USB gadget * * core.c - Top level support * * Copyright 2017 IBM Corporation * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/delay.h> #include <linux/ioport.h> #include <linux/slab.h> #include <linux/errno.h> #include <linux/list.h> #include <linux/interrupt.h> #include <linux/proc_fs.h> #include <linux/prefetch.h> #include <linux/clk.h> #include <linux/usb/gadget.h> #include <linux/of.h> #include <linux/of_gpio.h> #include <linux/regmap.h> #include <linux/dma-mapping.h> #include "vhub.h" void ast_vhub_done(struct ast_vhub_ep *ep, struct ast_vhub_req *req, int status) { bool internal = req->internal; EPVDBG(ep, "completing request @%p, status %d\n", req, status); list_del_init(&req->queue); if (req->req.status == -EINPROGRESS) req->req.status = status; if (req->req.dma) { if (!WARN_ON(!ep->dev)) usb_gadget_unmap_request(&ep->dev->gadget, &req->req, ep->epn.is_in); req->req.dma = 0; } /* * If this isn't an internal EP0 request, call the core * to call the gadget completion. */ if (!internal) { spin_unlock(&ep->vhub->lock); usb_gadget_giveback_request(&ep->ep, &req->req); spin_lock(&ep->vhub->lock); } } void ast_vhub_nuke(struct ast_vhub_ep *ep, int status) { struct ast_vhub_req *req; EPDBG(ep, "Nuking\n"); /* Beware, lock will be dropped & req-acquired by done() */ while (!list_empty(&ep->queue)) { req = list_first_entry(&ep->queue, struct ast_vhub_req, queue); ast_vhub_done(ep, req, status); } } struct usb_request *ast_vhub_alloc_request(struct usb_ep *u_ep, gfp_t gfp_flags) { struct ast_vhub_req *req; req = kzalloc(sizeof(*req), gfp_flags); if (!req) return NULL; return &req->req; } void ast_vhub_free_request(struct usb_ep *u_ep, struct usb_request *u_req) { struct ast_vhub_req *req = to_ast_req(u_req); kfree(req); } static irqreturn_t ast_vhub_irq(int irq, void *data) { struct ast_vhub *vhub = data; irqreturn_t iret = IRQ_NONE; u32 istat; /* Stale interrupt while tearing down */ if (!vhub->ep0_bufs) return IRQ_NONE; spin_lock(&vhub->lock); /* Read and ACK interrupts */ istat = readl(vhub->regs + AST_VHUB_ISR); if (!istat) goto bail; writel(istat, vhub->regs + AST_VHUB_ISR); iret = IRQ_HANDLED; UDCVDBG(vhub, "irq status=%08x, ep_acks=%08x ep_nacks=%08x\n", istat, readl(vhub->regs + AST_VHUB_EP_ACK_ISR), readl(vhub->regs + AST_VHUB_EP_NACK_ISR)); /* Handle generic EPs first */ if (istat & VHUB_IRQ_EP_POOL_ACK_STALL) { u32 i, ep_acks = readl(vhub->regs + AST_VHUB_EP_ACK_ISR); writel(ep_acks, vhub->regs + AST_VHUB_EP_ACK_ISR); for (i = 0; ep_acks && i < AST_VHUB_NUM_GEN_EPs; i++) { u32 mask = VHUB_EP_IRQ(i); if (ep_acks & mask) { ast_vhub_epn_ack_irq(&vhub->epns[i]); ep_acks &= ~mask; } } } /* Handle device interrupts */ if (istat & (VHUB_IRQ_DEVICE1 | VHUB_IRQ_DEVICE2 | VHUB_IRQ_DEVICE3 | VHUB_IRQ_DEVICE4 | VHUB_IRQ_DEVICE5)) { if (istat & VHUB_IRQ_DEVICE1) ast_vhub_dev_irq(&vhub->ports[0].dev); if (istat & VHUB_IRQ_DEVICE2) ast_vhub_dev_irq(&vhub->ports[1].dev); if (istat & VHUB_IRQ_DEVICE3) ast_vhub_dev_irq(&vhub->ports[2].dev); if (istat & VHUB_IRQ_DEVICE4) ast_vhub_dev_irq(&vhub->ports[3].dev); if (istat & VHUB_IRQ_DEVICE5) ast_vhub_dev_irq(&vhub->ports[4].dev); } /* Handle top-level vHub EP0 interrupts */ if (istat & (VHUB_IRQ_HUB_EP0_OUT_ACK_STALL | VHUB_IRQ_HUB_EP0_IN_ACK_STALL | VHUB_IRQ_HUB_EP0_SETUP)) { if (istat & VHUB_IRQ_HUB_EP0_IN_ACK_STALL) ast_vhub_ep0_handle_ack(&vhub->ep0, true); if (istat & VHUB_IRQ_HUB_EP0_OUT_ACK_STALL) ast_vhub_ep0_handle_ack(&vhub->ep0, false); if (istat & VHUB_IRQ_HUB_EP0_SETUP) ast_vhub_ep0_handle_setup(&vhub->ep0); } /* Various top level bus events */ if (istat & (VHUB_IRQ_BUS_RESUME | VHUB_IRQ_BUS_SUSPEND | VHUB_IRQ_BUS_RESET)) { if (istat & VHUB_IRQ_BUS_RESUME) ast_vhub_hub_resume(vhub); if (istat & VHUB_IRQ_BUS_SUSPEND) ast_vhub_hub_suspend(vhub); if (istat & VHUB_IRQ_BUS_RESET) ast_vhub_hub_reset(vhub); } bail: spin_unlock(&vhub->lock); return iret; } void ast_vhub_init_hw(struct ast_vhub *vhub) { u32 ctrl; UDCDBG(vhub,"(Re)Starting HW ...\n"); /* Enable PHY */ ctrl = VHUB_CTRL_PHY_CLK | VHUB_CTRL_PHY_RESET_DIS; /* * We do *NOT* set the VHUB_CTRL_CLK_STOP_SUSPEND bit * to stop the logic clock during suspend because * it causes the registers to become inaccessible and * we haven't yet figured out a good wayt to bring the * controller back into life to issue a wakeup. */ /* * Set some ISO & split control bits according to Aspeed * recommendation * * VHUB_CTRL_ISO_RSP_CTRL: When set tells the HW to respond * with 0 bytes data packet to ISO IN endpoints when no data * is available. * * VHUB_CTRL_SPLIT_IN: This makes a SOF complete a split IN * transaction. */ ctrl |= VHUB_CTRL_ISO_RSP_CTRL | VHUB_CTRL_SPLIT_IN; writel(ctrl, vhub->regs + AST_VHUB_CTRL); udelay(1); /* Set descriptor ring size */ if (AST_VHUB_DESCS_COUNT == 256) { ctrl |= VHUB_CTRL_LONG_DESC; writel(ctrl, vhub->regs + AST_VHUB_CTRL); } else { BUILD_BUG_ON(AST_VHUB_DESCS_COUNT != 32); } /* Reset all devices */ writel(VHUB_SW_RESET_ALL, vhub->regs + AST_VHUB_SW_RESET); udelay(1); writel(0, vhub->regs + AST_VHUB_SW_RESET); /* Disable and cleanup EP ACK/NACK interrupts */ writel(0, vhub->regs + AST_VHUB_EP_ACK_IER); writel(0, vhub->regs + AST_VHUB_EP_NACK_IER); writel(VHUB_EP_IRQ_ALL, vhub->regs + AST_VHUB_EP_ACK_ISR); writel(VHUB_EP_IRQ_ALL, vhub->regs + AST_VHUB_EP_NACK_ISR); /* Default settings for EP0, enable HW hub EP1 */ writel(0, vhub->regs + AST_VHUB_EP0_CTRL); writel(VHUB_EP1_CTRL_RESET_TOGGLE | VHUB_EP1_CTRL_ENABLE, vhub->regs + AST_VHUB_EP1_CTRL); writel(0, vhub->regs + AST_VHUB_EP1_STS_CHG); /* Configure EP0 DMA buffer */ writel(vhub->ep0.buf_dma, vhub->regs + AST_VHUB_EP0_DATA); /* Clear address */ writel(0, vhub->regs + AST_VHUB_CONF); /* Pullup hub (activate on host) */ if (vhub->force_usb1) ctrl |= VHUB_CTRL_FULL_SPEED_ONLY; ctrl |= VHUB_CTRL_UPSTREAM_CONNECT; writel(ctrl, vhub->regs + AST_VHUB_CTRL); /* Enable some interrupts */ writel(VHUB_IRQ_HUB_EP0_IN_ACK_STALL | VHUB_IRQ_HUB_EP0_OUT_ACK_STALL | VHUB_IRQ_HUB_EP0_SETUP | VHUB_IRQ_EP_POOL_ACK_STALL | VHUB_IRQ_BUS_RESUME | VHUB_IRQ_BUS_SUSPEND | VHUB_IRQ_BUS_RESET, vhub->regs + AST_VHUB_IER); } static int ast_vhub_remove(struct platform_device *pdev) { struct ast_vhub *vhub = platform_get_drvdata(pdev); unsigned long flags; int i; if (!vhub || !vhub->regs) return 0; /* Remove devices */ for (i = 0; i < AST_VHUB_NUM_PORTS; i++) ast_vhub_del_dev(&vhub->ports[i].dev); spin_lock_irqsave(&vhub->lock, flags); /* Mask & ack all interrupts */ writel(0, vhub->regs + AST_VHUB_IER); writel(VHUB_IRQ_ACK_ALL, vhub->regs + AST_VHUB_ISR); /* Pull device, leave PHY enabled */ writel(VHUB_CTRL_PHY_CLK | VHUB_CTRL_PHY_RESET_DIS, vhub->regs + AST_VHUB_CTRL); if (vhub->clk) clk_disable_unprepare(vhub->clk); spin_unlock_irqrestore(&vhub->lock, flags); if (vhub->ep0_bufs) dma_free_coherent(&pdev->dev, AST_VHUB_EP0_MAX_PACKET * (AST_VHUB_NUM_PORTS + 1), vhub->ep0_bufs, vhub->ep0_bufs_dma); vhub->ep0_bufs = NULL; return 0; } static int ast_vhub_probe(struct platform_device *pdev) { enum usb_device_speed max_speed; struct ast_vhub *vhub; struct resource *res; int i, rc = 0; vhub = devm_kzalloc(&pdev->dev, sizeof(*vhub), GFP_KERNEL); if (!vhub) return -ENOMEM; spin_lock_init(&vhub->lock); vhub->pdev = pdev; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); vhub->regs = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(vhub->regs)) { dev_err(&pdev->dev, "Failed to map resources\n"); return PTR_ERR(vhub->regs); } UDCDBG(vhub, "vHub@%pR mapped @%p\n", res, vhub->regs); platform_set_drvdata(pdev, vhub); vhub->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(vhub->clk)) { rc = PTR_ERR(vhub->clk); goto err; } rc = clk_prepare_enable(vhub->clk); if (rc) { dev_err(&pdev->dev, "Error couldn't enable clock (%d)\n", rc); goto err; } /* Check if we need to limit the HW to USB1 */ max_speed = usb_get_maximum_speed(&pdev->dev); if (max_speed != USB_SPEED_UNKNOWN && max_speed < USB_SPEED_HIGH) vhub->force_usb1 = true; /* Mask & ack all interrupts before installing the handler */ writel(0, vhub->regs + AST_VHUB_IER); writel(VHUB_IRQ_ACK_ALL, vhub->regs + AST_VHUB_ISR); /* Find interrupt and install handler */ vhub->irq = platform_get_irq(pdev, 0); if (vhub->irq < 0) { dev_err(&pdev->dev, "Failed to get interrupt\n"); rc = vhub->irq; goto err; } rc = devm_request_irq(&pdev->dev, vhub->irq, ast_vhub_irq, 0, KBUILD_MODNAME, vhub); if (rc) { dev_err(&pdev->dev, "Failed to request interrupt\n"); goto err; } /* * Allocate DMA buffers for all EP0s in one chunk, * one per port and one for the vHub itself */ vhub->ep0_bufs = dma_alloc_coherent(&pdev->dev, AST_VHUB_EP0_MAX_PACKET * (AST_VHUB_NUM_PORTS + 1), &vhub->ep0_bufs_dma, GFP_KERNEL); if (!vhub->ep0_bufs) { dev_err(&pdev->dev, "Failed to allocate EP0 DMA buffers\n"); rc = -ENOMEM; goto err; } UDCVDBG(vhub, "EP0 DMA buffers @%p (DMA 0x%08x)\n", vhub->ep0_bufs, (u32)vhub->ep0_bufs_dma); /* Init vHub EP0 */ ast_vhub_init_ep0(vhub, &vhub->ep0, NULL); /* Init devices */ for (i = 0; i < AST_VHUB_NUM_PORTS && rc == 0; i++) rc = ast_vhub_init_dev(vhub, i); if (rc) goto err; /* Init hub emulation */ ast_vhub_init_hub(vhub); /* Initialize HW */ ast_vhub_init_hw(vhub); dev_info(&pdev->dev, "Initialized virtual hub in USB%d mode\n", vhub->force_usb1 ? 1 : 2); return 0; err: ast_vhub_remove(pdev); return rc; } static const struct of_device_id ast_vhub_dt_ids[] = { { .compatible = "aspeed,ast2400-usb-vhub", }, { .compatible = "aspeed,ast2500-usb-vhub", }, { } }; MODULE_DEVICE_TABLE(of, ast_vhub_dt_ids); static struct platform_driver ast_vhub_driver = { .probe = ast_vhub_probe, .remove = ast_vhub_remove, .driver = { .name = KBUILD_MODNAME, .of_match_table = ast_vhub_dt_ids, }, }; module_platform_driver(ast_vhub_driver); MODULE_DESCRIPTION("Aspeed vHub udc driver"); MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); MODULE_LICENSE("GPL");
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