610 lines
14 KiB
C
610 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* aspeed-vhub -- Driver for Aspeed SoC "vHub" USB gadget
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*
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* dev.c - Individual device/gadget management (ie, a port = a gadget)
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*
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* Copyright 2017 IBM Corporation
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/delay.h>
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#include <linux/ioport.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/list.h>
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#include <linux/interrupt.h>
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#include <linux/proc_fs.h>
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#include <linux/prefetch.h>
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#include <linux/clk.h>
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#include <linux/usb/gadget.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/regmap.h>
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#include <linux/dma-mapping.h>
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#include <linux/usb.h>
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#include <linux/usb/hcd.h>
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#include "vhub.h"
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void ast_vhub_dev_irq(struct ast_vhub_dev *d)
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{
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u32 istat = readl(d->regs + AST_VHUB_DEV_ISR);
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writel(istat, d->regs + AST_VHUB_DEV_ISR);
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if (istat & VHUV_DEV_IRQ_EP0_IN_ACK_STALL)
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ast_vhub_ep0_handle_ack(&d->ep0, true);
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if (istat & VHUV_DEV_IRQ_EP0_OUT_ACK_STALL)
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ast_vhub_ep0_handle_ack(&d->ep0, false);
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if (istat & VHUV_DEV_IRQ_EP0_SETUP)
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ast_vhub_ep0_handle_setup(&d->ep0);
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}
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static void ast_vhub_dev_enable(struct ast_vhub_dev *d)
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{
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u32 reg, hmsk, i;
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if (d->enabled)
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return;
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/* Cleanup EP0 state */
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ast_vhub_reset_ep0(d);
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/* Enable device and its EP0 interrupts */
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reg = VHUB_DEV_EN_ENABLE_PORT |
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VHUB_DEV_EN_EP0_IN_ACK_IRQEN |
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VHUB_DEV_EN_EP0_OUT_ACK_IRQEN |
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VHUB_DEV_EN_EP0_SETUP_IRQEN;
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if (d->gadget.speed == USB_SPEED_HIGH)
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reg |= VHUB_DEV_EN_SPEED_SEL_HIGH;
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writel(reg, d->regs + AST_VHUB_DEV_EN_CTRL);
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/* Enable device interrupt in the hub as well */
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hmsk = VHUB_IRQ_DEVICE1 << d->index;
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reg = readl(d->vhub->regs + AST_VHUB_IER);
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reg |= hmsk;
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writel(reg, d->vhub->regs + AST_VHUB_IER);
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/* Set EP0 DMA buffer address */
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writel(d->ep0.buf_dma, d->regs + AST_VHUB_DEV_EP0_DATA);
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/* Clear stall on all EPs */
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for (i = 0; i < d->max_epns; i++) {
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struct ast_vhub_ep *ep = d->epns[i];
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if (ep && (ep->epn.stalled || ep->epn.wedged)) {
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ep->epn.stalled = false;
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ep->epn.wedged = false;
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ast_vhub_update_epn_stall(ep);
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}
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}
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/* Additional cleanups */
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d->wakeup_en = false;
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d->enabled = true;
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}
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static void ast_vhub_dev_disable(struct ast_vhub_dev *d)
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{
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u32 reg, hmsk;
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if (!d->enabled)
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return;
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/* Disable device interrupt in the hub */
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hmsk = VHUB_IRQ_DEVICE1 << d->index;
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reg = readl(d->vhub->regs + AST_VHUB_IER);
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reg &= ~hmsk;
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writel(reg, d->vhub->regs + AST_VHUB_IER);
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/* Then disable device */
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writel(0, d->regs + AST_VHUB_DEV_EN_CTRL);
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d->gadget.speed = USB_SPEED_UNKNOWN;
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d->enabled = false;
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}
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static int ast_vhub_dev_feature(struct ast_vhub_dev *d,
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u16 wIndex, u16 wValue,
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bool is_set)
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{
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u32 val;
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DDBG(d, "%s_FEATURE(dev val=%02x)\n",
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is_set ? "SET" : "CLEAR", wValue);
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if (wValue == USB_DEVICE_REMOTE_WAKEUP) {
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d->wakeup_en = is_set;
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return std_req_complete;
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}
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if (wValue == USB_DEVICE_TEST_MODE) {
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val = readl(d->vhub->regs + AST_VHUB_CTRL);
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val &= ~GENMASK(10, 8);
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val |= VHUB_CTRL_SET_TEST_MODE((wIndex >> 8) & 0x7);
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writel(val, d->vhub->regs + AST_VHUB_CTRL);
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return std_req_complete;
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}
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return std_req_driver;
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}
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static int ast_vhub_ep_feature(struct ast_vhub_dev *d,
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u16 wIndex, u16 wValue, bool is_set)
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{
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struct ast_vhub_ep *ep;
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int ep_num;
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ep_num = wIndex & USB_ENDPOINT_NUMBER_MASK;
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DDBG(d, "%s_FEATURE(ep%d val=%02x)\n",
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is_set ? "SET" : "CLEAR", ep_num, wValue);
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if (ep_num == 0)
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return std_req_complete;
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if (ep_num >= d->max_epns || !d->epns[ep_num - 1])
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return std_req_stall;
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if (wValue != USB_ENDPOINT_HALT)
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return std_req_driver;
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ep = d->epns[ep_num - 1];
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if (WARN_ON(!ep))
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return std_req_stall;
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if (!ep->epn.enabled || !ep->ep.desc || ep->epn.is_iso ||
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ep->epn.is_in != !!(wIndex & USB_DIR_IN))
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return std_req_stall;
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DDBG(d, "%s stall on EP %d\n",
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is_set ? "setting" : "clearing", ep_num);
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ep->epn.stalled = is_set;
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ast_vhub_update_epn_stall(ep);
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return std_req_complete;
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}
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static int ast_vhub_dev_status(struct ast_vhub_dev *d,
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u16 wIndex, u16 wValue)
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{
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u8 st0;
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DDBG(d, "GET_STATUS(dev)\n");
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st0 = d->gadget.is_selfpowered << USB_DEVICE_SELF_POWERED;
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if (d->wakeup_en)
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st0 |= 1 << USB_DEVICE_REMOTE_WAKEUP;
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return ast_vhub_simple_reply(&d->ep0, st0, 0);
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}
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static int ast_vhub_ep_status(struct ast_vhub_dev *d,
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u16 wIndex, u16 wValue)
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{
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int ep_num = wIndex & USB_ENDPOINT_NUMBER_MASK;
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struct ast_vhub_ep *ep;
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u8 st0 = 0;
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DDBG(d, "GET_STATUS(ep%d)\n", ep_num);
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if (ep_num >= d->max_epns)
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return std_req_stall;
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if (ep_num != 0) {
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ep = d->epns[ep_num - 1];
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if (!ep)
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return std_req_stall;
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if (!ep->epn.enabled || !ep->ep.desc || ep->epn.is_iso ||
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ep->epn.is_in != !!(wIndex & USB_DIR_IN))
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return std_req_stall;
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if (ep->epn.stalled)
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st0 |= 1 << USB_ENDPOINT_HALT;
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}
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return ast_vhub_simple_reply(&d->ep0, st0, 0);
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}
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static void ast_vhub_dev_set_address(struct ast_vhub_dev *d, u8 addr)
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{
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u32 reg;
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DDBG(d, "SET_ADDRESS: Got address %x\n", addr);
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reg = readl(d->regs + AST_VHUB_DEV_EN_CTRL);
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reg &= ~VHUB_DEV_EN_ADDR_MASK;
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reg |= VHUB_DEV_EN_SET_ADDR(addr);
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writel(reg, d->regs + AST_VHUB_DEV_EN_CTRL);
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}
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int ast_vhub_std_dev_request(struct ast_vhub_ep *ep,
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struct usb_ctrlrequest *crq)
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{
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struct ast_vhub_dev *d = ep->dev;
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u16 wValue, wIndex;
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/* No driver, we shouldn't be enabled ... */
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if (!d->driver || !d->enabled) {
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EPDBG(ep,
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"Device is wrong state driver=%p enabled=%d\n",
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d->driver, d->enabled);
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return std_req_stall;
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}
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/*
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* Note: we used to reject/stall requests while suspended,
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* we don't do that anymore as we seem to have cases of
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* mass storage getting very upset.
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*/
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/* First packet, grab speed */
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if (d->gadget.speed == USB_SPEED_UNKNOWN) {
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d->gadget.speed = ep->vhub->speed;
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if (d->gadget.speed > d->driver->max_speed)
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d->gadget.speed = d->driver->max_speed;
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DDBG(d, "fist packet, captured speed %d\n",
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d->gadget.speed);
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}
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wValue = le16_to_cpu(crq->wValue);
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wIndex = le16_to_cpu(crq->wIndex);
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switch ((crq->bRequestType << 8) | crq->bRequest) {
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/* SET_ADDRESS */
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case DeviceOutRequest | USB_REQ_SET_ADDRESS:
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ast_vhub_dev_set_address(d, wValue);
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return std_req_complete;
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/* GET_STATUS */
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case DeviceRequest | USB_REQ_GET_STATUS:
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return ast_vhub_dev_status(d, wIndex, wValue);
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case InterfaceRequest | USB_REQ_GET_STATUS:
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return ast_vhub_simple_reply(ep, 0, 0);
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case EndpointRequest | USB_REQ_GET_STATUS:
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return ast_vhub_ep_status(d, wIndex, wValue);
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/* SET/CLEAR_FEATURE */
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case DeviceOutRequest | USB_REQ_SET_FEATURE:
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return ast_vhub_dev_feature(d, wIndex, wValue, true);
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case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
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return ast_vhub_dev_feature(d, wIndex, wValue, false);
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case EndpointOutRequest | USB_REQ_SET_FEATURE:
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return ast_vhub_ep_feature(d, wIndex, wValue, true);
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case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
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return ast_vhub_ep_feature(d, wIndex, wValue, false);
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}
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return std_req_driver;
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}
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static int ast_vhub_udc_wakeup(struct usb_gadget* gadget)
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{
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struct ast_vhub_dev *d = to_ast_dev(gadget);
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unsigned long flags;
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int rc = -EINVAL;
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spin_lock_irqsave(&d->vhub->lock, flags);
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if (!d->wakeup_en)
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goto err;
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DDBG(d, "Device initiated wakeup\n");
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/* Wakeup the host */
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ast_vhub_hub_wake_all(d->vhub);
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rc = 0;
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err:
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spin_unlock_irqrestore(&d->vhub->lock, flags);
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return rc;
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}
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static int ast_vhub_udc_get_frame(struct usb_gadget* gadget)
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{
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struct ast_vhub_dev *d = to_ast_dev(gadget);
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return (readl(d->vhub->regs + AST_VHUB_USBSTS) >> 16) & 0x7ff;
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}
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static void ast_vhub_dev_nuke(struct ast_vhub_dev *d)
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{
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unsigned int i;
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for (i = 0; i < d->max_epns; i++) {
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if (!d->epns[i])
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continue;
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ast_vhub_nuke(d->epns[i], -ESHUTDOWN);
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}
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}
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static int ast_vhub_udc_pullup(struct usb_gadget* gadget, int on)
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{
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struct ast_vhub_dev *d = to_ast_dev(gadget);
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unsigned long flags;
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spin_lock_irqsave(&d->vhub->lock, flags);
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DDBG(d, "pullup(%d)\n", on);
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/* Mark disconnected in the hub */
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ast_vhub_device_connect(d->vhub, d->index, on);
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/*
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* If enabled, nuke all requests if any (there shouldn't be)
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* and disable the port. This will clear the address too.
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*/
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if (d->enabled) {
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ast_vhub_dev_nuke(d);
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ast_vhub_dev_disable(d);
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}
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spin_unlock_irqrestore(&d->vhub->lock, flags);
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return 0;
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}
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static int ast_vhub_udc_start(struct usb_gadget *gadget,
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struct usb_gadget_driver *driver)
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{
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struct ast_vhub_dev *d = to_ast_dev(gadget);
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unsigned long flags;
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spin_lock_irqsave(&d->vhub->lock, flags);
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DDBG(d, "start\n");
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/* We don't do much more until the hub enables us */
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d->driver = driver;
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d->gadget.is_selfpowered = 1;
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spin_unlock_irqrestore(&d->vhub->lock, flags);
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return 0;
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}
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static struct usb_ep *ast_vhub_udc_match_ep(struct usb_gadget *gadget,
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struct usb_endpoint_descriptor *desc,
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struct usb_ss_ep_comp_descriptor *ss)
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{
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struct ast_vhub_dev *d = to_ast_dev(gadget);
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struct ast_vhub_ep *ep;
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struct usb_ep *u_ep;
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unsigned int max, addr, i;
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DDBG(d, "Match EP type %d\n", usb_endpoint_type(desc));
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/*
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* First we need to look for an existing unclaimed EP as another
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* configuration may have already associated a bunch of EPs with
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* this gadget. This duplicates the code in usb_ep_autoconfig_ss()
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* unfortunately.
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*/
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list_for_each_entry(u_ep, &gadget->ep_list, ep_list) {
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if (usb_gadget_ep_match_desc(gadget, u_ep, desc, ss)) {
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DDBG(d, " -> using existing EP%d\n",
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to_ast_ep(u_ep)->d_idx);
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return u_ep;
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}
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}
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/*
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* We didn't find one, we need to grab one from the pool.
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*
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* First let's do some sanity checking
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*/
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switch(usb_endpoint_type(desc)) {
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case USB_ENDPOINT_XFER_CONTROL:
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/* Only EP0 can be a control endpoint */
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return NULL;
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case USB_ENDPOINT_XFER_ISOC:
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/* ISO: limit 1023 bytes full speed, 1024 high/super speed */
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if (gadget_is_dualspeed(gadget))
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max = 1024;
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else
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max = 1023;
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break;
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case USB_ENDPOINT_XFER_BULK:
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if (gadget_is_dualspeed(gadget))
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max = 512;
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else
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max = 64;
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break;
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case USB_ENDPOINT_XFER_INT:
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if (gadget_is_dualspeed(gadget))
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max = 1024;
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else
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max = 64;
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break;
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}
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if (usb_endpoint_maxp(desc) > max)
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return NULL;
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/*
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* Find a free EP address for that device. We can't
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* let the generic code assign these as it would
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* create overlapping numbers for IN and OUT which
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* we don't support, so also create a suitable name
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* that will allow the generic code to use our
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* assigned address.
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*/
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for (i = 0; i < d->max_epns; i++)
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if (d->epns[i] == NULL)
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break;
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if (i >= d->max_epns)
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return NULL;
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addr = i + 1;
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/*
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* Now grab an EP from the shared pool and associate
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* it with our device
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*/
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ep = ast_vhub_alloc_epn(d, addr);
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if (!ep)
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return NULL;
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DDBG(d, "Allocated epn#%d for port EP%d\n",
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ep->epn.g_idx, addr);
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return &ep->ep;
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}
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static int ast_vhub_udc_stop(struct usb_gadget *gadget)
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{
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struct ast_vhub_dev *d = to_ast_dev(gadget);
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unsigned long flags;
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spin_lock_irqsave(&d->vhub->lock, flags);
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DDBG(d, "stop\n");
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d->driver = NULL;
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d->gadget.speed = USB_SPEED_UNKNOWN;
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ast_vhub_dev_nuke(d);
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if (d->enabled)
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ast_vhub_dev_disable(d);
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spin_unlock_irqrestore(&d->vhub->lock, flags);
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return 0;
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}
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static const struct usb_gadget_ops ast_vhub_udc_ops = {
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.get_frame = ast_vhub_udc_get_frame,
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.wakeup = ast_vhub_udc_wakeup,
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.pullup = ast_vhub_udc_pullup,
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.udc_start = ast_vhub_udc_start,
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.udc_stop = ast_vhub_udc_stop,
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.match_ep = ast_vhub_udc_match_ep,
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};
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void ast_vhub_dev_suspend(struct ast_vhub_dev *d)
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{
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if (d->driver && d->driver->suspend) {
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spin_unlock(&d->vhub->lock);
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d->driver->suspend(&d->gadget);
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spin_lock(&d->vhub->lock);
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}
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}
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void ast_vhub_dev_resume(struct ast_vhub_dev *d)
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{
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if (d->driver && d->driver->resume) {
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spin_unlock(&d->vhub->lock);
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d->driver->resume(&d->gadget);
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spin_lock(&d->vhub->lock);
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}
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}
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void ast_vhub_dev_reset(struct ast_vhub_dev *d)
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{
|
|
/* No driver, just disable the device and return */
|
|
if (!d->driver) {
|
|
ast_vhub_dev_disable(d);
|
|
return;
|
|
}
|
|
|
|
/* If the port isn't enabled, just enable it */
|
|
if (!d->enabled) {
|
|
DDBG(d, "Reset of disabled device, enabling...\n");
|
|
ast_vhub_dev_enable(d);
|
|
} else {
|
|
DDBG(d, "Reset of enabled device, resetting...\n");
|
|
spin_unlock(&d->vhub->lock);
|
|
usb_gadget_udc_reset(&d->gadget, d->driver);
|
|
spin_lock(&d->vhub->lock);
|
|
|
|
/*
|
|
* Disable and maybe re-enable HW, this will clear the address
|
|
* and speed setting.
|
|
*/
|
|
ast_vhub_dev_disable(d);
|
|
ast_vhub_dev_enable(d);
|
|
}
|
|
}
|
|
|
|
void ast_vhub_del_dev(struct ast_vhub_dev *d)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&d->vhub->lock, flags);
|
|
if (!d->registered) {
|
|
spin_unlock_irqrestore(&d->vhub->lock, flags);
|
|
return;
|
|
}
|
|
d->registered = false;
|
|
spin_unlock_irqrestore(&d->vhub->lock, flags);
|
|
|
|
usb_del_gadget_udc(&d->gadget);
|
|
device_unregister(d->port_dev);
|
|
kfree(d->epns);
|
|
}
|
|
|
|
static void ast_vhub_dev_release(struct device *dev)
|
|
{
|
|
kfree(dev);
|
|
}
|
|
|
|
int ast_vhub_init_dev(struct ast_vhub *vhub, unsigned int idx)
|
|
{
|
|
struct ast_vhub_dev *d = &vhub->ports[idx].dev;
|
|
struct device *parent = &vhub->pdev->dev;
|
|
int rc;
|
|
|
|
d->vhub = vhub;
|
|
d->index = idx;
|
|
d->name = devm_kasprintf(parent, GFP_KERNEL, "port%d", idx+1);
|
|
d->regs = vhub->regs + 0x100 + 0x10 * idx;
|
|
|
|
ast_vhub_init_ep0(vhub, &d->ep0, d);
|
|
|
|
/*
|
|
* A USB device can have up to 30 endpoints besides control
|
|
* endpoint 0.
|
|
*/
|
|
d->max_epns = min_t(u32, vhub->max_epns, 30);
|
|
d->epns = kcalloc(d->max_epns, sizeof(*d->epns), GFP_KERNEL);
|
|
if (!d->epns)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* The UDC core really needs us to have separate and uniquely
|
|
* named "parent" devices for each port so we create a sub device
|
|
* here for that purpose
|
|
*/
|
|
d->port_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
|
|
if (!d->port_dev) {
|
|
rc = -ENOMEM;
|
|
goto fail_alloc;
|
|
}
|
|
device_initialize(d->port_dev);
|
|
d->port_dev->release = ast_vhub_dev_release;
|
|
d->port_dev->parent = parent;
|
|
dev_set_name(d->port_dev, "%s:p%d", dev_name(parent), idx + 1);
|
|
rc = device_add(d->port_dev);
|
|
if (rc)
|
|
goto fail_add;
|
|
|
|
/* Populate gadget */
|
|
INIT_LIST_HEAD(&d->gadget.ep_list);
|
|
d->gadget.ops = &ast_vhub_udc_ops;
|
|
d->gadget.ep0 = &d->ep0.ep;
|
|
d->gadget.name = KBUILD_MODNAME;
|
|
if (vhub->force_usb1)
|
|
d->gadget.max_speed = USB_SPEED_FULL;
|
|
else
|
|
d->gadget.max_speed = USB_SPEED_HIGH;
|
|
d->gadget.speed = USB_SPEED_UNKNOWN;
|
|
d->gadget.dev.of_node = vhub->pdev->dev.of_node;
|
|
|
|
rc = usb_add_gadget_udc(d->port_dev, &d->gadget);
|
|
if (rc != 0)
|
|
goto fail_udc;
|
|
d->registered = true;
|
|
|
|
return 0;
|
|
fail_udc:
|
|
device_del(d->port_dev);
|
|
fail_add:
|
|
put_device(d->port_dev);
|
|
fail_alloc:
|
|
kfree(d->epns);
|
|
|
|
return rc;
|
|
}
|