| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Felipe Balbi | 6984 | 54.19% | 41 | 17.90% |
| Tony Lindgren | 1779 | 13.80% | 25 | 10.92% |
| Ajay Kumar Gupta | 751 | 5.83% | 13 | 5.68% |
| Bin Liu | 620 | 4.81% | 16 | 6.99% |
| Daniel Mack | 433 | 3.36% | 13 | 5.68% |
| Heikki Krogerus | 337 | 2.61% | 6 | 2.62% |
| Min Guo | 249 | 1.93% | 2 | 0.87% |
| Sebastian Andrzej Siewior | 236 | 1.83% | 13 | 5.68% |
| Paul Cercueil | 195 | 1.51% | 6 | 2.62% |
| Arnaud Mandy | 164 | 1.27% | 1 | 0.44% |
| David Brownell | 154 | 1.19% | 7 | 3.06% |
| Grazvydas Ignotas | 102 | 0.79% | 4 | 1.75% |
| Hans de Goede | 78 | 0.61% | 4 | 1.75% |
| Bryan Wu | 78 | 0.61% | 4 | 1.75% |
| Johan Hovold | 65 | 0.50% | 3 | 1.31% |
| Petr Kulhavy | 54 | 0.42% | 2 | 0.87% |
| Magnus Damm | 50 | 0.39% | 1 | 0.44% |
| Bob Liu | 47 | 0.36% | 1 | 0.44% |
| Sergei Shtylyov | 44 | 0.34% | 4 | 1.75% |
| Uwe Kleine-König | 40 | 0.31% | 3 | 1.31% |
| Hema Kalliguddi | 39 | 0.30% | 2 | 0.87% |
| Roger Quadros | 38 | 0.29% | 1 | 0.44% |
| Roman Alyautdin | 35 | 0.27% | 1 | 0.44% |
| Ben Hutchings | 27 | 0.21% | 1 | 0.44% |
| Anand Gadiyar | 26 | 0.20% | 2 | 0.87% |
| Greg Kroah-Hartman | 23 | 0.18% | 6 | 2.62% |
| Alexandre Bailon | 21 | 0.16% | 2 | 0.87% |
| Pascal Huerst | 18 | 0.14% | 1 | 0.44% |
| Kevin Hilman | 16 | 0.12% | 1 | 0.44% |
| Peter Ujfalusi | 16 | 0.12% | 1 | 0.44% |
| Kees Cook | 13 | 0.10% | 1 | 0.44% |
| George Cherian | 12 | 0.09% | 2 | 0.87% |
| Gustavo A. R. Silva | 12 | 0.09% | 1 | 0.44% |
| Mian Yousaf Kaukab | 12 | 0.09% | 1 | 0.44% |
| Arnd Bergmann | 10 | 0.08% | 2 | 0.87% |
| Merlijn Wajer | 10 | 0.08% | 2 | 0.87% |
| Rasmus Villemoes | 8 | 0.06% | 2 | 0.87% |
| Kishon Vijay Abraham I | 7 | 0.05% | 2 | 0.87% |
| Markus Pargmann | 6 | 0.05% | 1 | 0.44% |
| Andreas Kemnade | 6 | 0.05% | 1 | 0.44% |
| Vikram Pandita | 6 | 0.05% | 1 | 0.44% |
| Mike Frysinger | 6 | 0.05% | 2 | 0.87% |
| Aaro Koskinen | 5 | 0.04% | 1 | 0.44% |
| Matthew Leach | 5 | 0.04% | 1 | 0.44% |
| Alan Stern | 5 | 0.04% | 1 | 0.44% |
| Jérémy Lefaure | 5 | 0.04% | 1 | 0.44% |
| Kay Sievers | 5 | 0.04% | 1 | 0.44% |
| Jonathan Liu | 4 | 0.03% | 1 | 0.44% |
| Yang Yingliang | 4 | 0.03% | 1 | 0.44% |
| Vladimir Zapolskiy | 4 | 0.03% | 1 | 0.44% |
| Sergey Shtylyov | 4 | 0.03% | 1 | 0.44% |
| Jingoo Han | 3 | 0.02% | 1 | 0.44% |
| Varka Bhadram | 2 | 0.02% | 1 | 0.44% |
| Rahul Bedarkar | 2 | 0.02% | 1 | 0.44% |
| Yue haibing | 2 | 0.02% | 1 | 0.44% |
| Bixuan Cui | 1 | 0.01% | 1 | 0.44% |
| Colin Ian King | 1 | 0.01% | 1 | 0.44% |
| Rusty Russell | 1 | 0.01% | 1 | 0.44% |
| Maulik Mankad | 1 | 0.01% | 1 | 0.44% |
| Thomas Petazzoni | 1 | 0.01% | 1 | 0.44% |
| Saurav Girepunje | 1 | 0.01% | 1 | 0.44% |
| Ladislav Michl | 1 | 0.01% | 1 | 0.44% |
| Shubhrajyoti Datta | 1 | 0.01% | 1 | 0.44% |
| Jason Yan | 1 | 0.01% | 1 | 0.44% |
| Alexey Dobriyan | 1 | 0.01% | 1 | 0.44% |
| Ezequiel García | 1 | 0.01% | 1 | 0.44% |
| Total | 12888 | 229 |
// SPDX-License-Identifier: GPL-2.0 /* * MUSB OTG driver core code * * Copyright 2005 Mentor Graphics Corporation * Copyright (C) 2005-2006 by Texas Instruments * Copyright (C) 2006-2007 Nokia Corporation */ /* * Inventra (Multipoint) Dual-Role Controller Driver for Linux. * * This consists of a Host Controller Driver (HCD) and a peripheral * controller driver implementing the "Gadget" API; OTG support is * in the works. These are normal Linux-USB controller drivers which * use IRQs and have no dedicated thread. * * This version of the driver has only been used with products from * Texas Instruments. Those products integrate the Inventra logic * with other DMA, IRQ, and bus modules, as well as other logic that * needs to be reflected in this driver. * * * NOTE: the original Mentor code here was pretty much a collection * of mechanisms that don't seem to have been fully integrated/working * for *any* Linux kernel version. This version aims at Linux 2.6.now, * Key open issues include: * * - Lack of host-side transaction scheduling, for all transfer types. * The hardware doesn't do it; instead, software must. * * This is not an issue for OTG devices that don't support external * hubs, but for more "normal" USB hosts it's a user issue that the * "multipoint" support doesn't scale in the expected ways. That * includes DaVinci EVM in a common non-OTG mode. * * * Control and bulk use dedicated endpoints, and there's as * yet no mechanism to either (a) reclaim the hardware when * peripherals are NAKing, which gets complicated with bulk * endpoints, or (b) use more than a single bulk endpoint in * each direction. * * RESULT: one device may be perceived as blocking another one. * * * Interrupt and isochronous will dynamically allocate endpoint * hardware, but (a) there's no record keeping for bandwidth; * (b) in the common case that few endpoints are available, there * is no mechanism to reuse endpoints to talk to multiple devices. * * RESULT: At one extreme, bandwidth can be overcommitted in * some hardware configurations, no faults will be reported. * At the other extreme, the bandwidth capabilities which do * exist tend to be severely undercommitted. You can't yet hook * up both a keyboard and a mouse to an external USB hub. */ /* * This gets many kinds of configuration information: * - Kconfig for everything user-configurable * - platform_device for addressing, irq, and platform_data * - platform_data is mostly for board-specific information * (plus recentrly, SOC or family details) * * Most of the conditional compilation will (someday) vanish. */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/slab.h> #include <linux/list.h> #include <linux/kobject.h> #include <linux/prefetch.h> #include <linux/platform_device.h> #include <linux/io.h> #include <linux/iopoll.h> #include <linux/dma-mapping.h> #include <linux/usb.h> #include <linux/usb/of.h> #include "musb_core.h" #include "musb_trace.h" #define TA_WAIT_BCON(m) max_t(int, (m)->a_wait_bcon, OTG_TIME_A_WAIT_BCON) #define DRIVER_AUTHOR "Mentor Graphics, Texas Instruments, Nokia" #define DRIVER_DESC "Inventra Dual-Role USB Controller Driver" #define MUSB_VERSION "6.0" #define DRIVER_INFO DRIVER_DESC ", v" MUSB_VERSION #define MUSB_DRIVER_NAME "musb-hdrc" const char musb_driver_name[] = MUSB_DRIVER_NAME; MODULE_DESCRIPTION(DRIVER_INFO); MODULE_AUTHOR(DRIVER_AUTHOR); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:" MUSB_DRIVER_NAME); /*-------------------------------------------------------------------------*/ static inline struct musb *dev_to_musb(struct device *dev) { return dev_get_drvdata(dev); } enum musb_mode musb_get_mode(struct device *dev) { enum usb_dr_mode mode; mode = usb_get_dr_mode(dev); switch (mode) { case USB_DR_MODE_HOST: return MUSB_HOST; case USB_DR_MODE_PERIPHERAL: return MUSB_PERIPHERAL; case USB_DR_MODE_OTG: case USB_DR_MODE_UNKNOWN: default: return MUSB_OTG; } } EXPORT_SYMBOL_GPL(musb_get_mode); /*-------------------------------------------------------------------------*/ static int musb_ulpi_read(struct usb_phy *phy, u32 reg) { void __iomem *addr = phy->io_priv; int i = 0; u8 r; u8 power; int ret; pm_runtime_get_sync(phy->io_dev); /* Make sure the transceiver is not in low power mode */ power = musb_readb(addr, MUSB_POWER); power &= ~MUSB_POWER_SUSPENDM; musb_writeb(addr, MUSB_POWER, power); /* REVISIT: musbhdrc_ulpi_an.pdf recommends setting the * ULPICarKitControlDisableUTMI after clearing POWER_SUSPENDM. */ musb_writeb(addr, MUSB_ULPI_REG_ADDR, (u8)reg); musb_writeb(addr, MUSB_ULPI_REG_CONTROL, MUSB_ULPI_REG_REQ | MUSB_ULPI_RDN_WR); while (!(musb_readb(addr, MUSB_ULPI_REG_CONTROL) & MUSB_ULPI_REG_CMPLT)) { i++; if (i == 10000) { ret = -ETIMEDOUT; goto out; } } r = musb_readb(addr, MUSB_ULPI_REG_CONTROL); r &= ~MUSB_ULPI_REG_CMPLT; musb_writeb(addr, MUSB_ULPI_REG_CONTROL, r); ret = musb_readb(addr, MUSB_ULPI_REG_DATA); out: pm_runtime_put(phy->io_dev); return ret; } static int musb_ulpi_write(struct usb_phy *phy, u32 val, u32 reg) { void __iomem *addr = phy->io_priv; int i = 0; u8 r = 0; u8 power; int ret = 0; pm_runtime_get_sync(phy->io_dev); /* Make sure the transceiver is not in low power mode */ power = musb_readb(addr, MUSB_POWER); power &= ~MUSB_POWER_SUSPENDM; musb_writeb(addr, MUSB_POWER, power); musb_writeb(addr, MUSB_ULPI_REG_ADDR, (u8)reg); musb_writeb(addr, MUSB_ULPI_REG_DATA, (u8)val); musb_writeb(addr, MUSB_ULPI_REG_CONTROL, MUSB_ULPI_REG_REQ); while (!(musb_readb(addr, MUSB_ULPI_REG_CONTROL) & MUSB_ULPI_REG_CMPLT)) { i++; if (i == 10000) { ret = -ETIMEDOUT; goto out; } } r = musb_readb(addr, MUSB_ULPI_REG_CONTROL); r &= ~MUSB_ULPI_REG_CMPLT; musb_writeb(addr, MUSB_ULPI_REG_CONTROL, r); out: pm_runtime_put(phy->io_dev); return ret; } static struct usb_phy_io_ops musb_ulpi_access = { .read = musb_ulpi_read, .write = musb_ulpi_write, }; /*-------------------------------------------------------------------------*/ static u32 musb_default_fifo_offset(u8 epnum) { return 0x20 + (epnum * 4); } /* "flat" mapping: each endpoint has its own i/o address */ static void musb_flat_ep_select(void __iomem *mbase, u8 epnum) { } static u32 musb_flat_ep_offset(u8 epnum, u16 offset) { return 0x100 + (0x10 * epnum) + offset; } /* "indexed" mapping: INDEX register controls register bank select */ static void musb_indexed_ep_select(void __iomem *mbase, u8 epnum) { musb_writeb(mbase, MUSB_INDEX, epnum); } static u32 musb_indexed_ep_offset(u8 epnum, u16 offset) { return 0x10 + offset; } static u32 musb_default_busctl_offset(u8 epnum, u16 offset) { return 0x80 + (0x08 * epnum) + offset; } static u8 musb_default_readb(void __iomem *addr, u32 offset) { u8 data = __raw_readb(addr + offset); trace_musb_readb(__builtin_return_address(0), addr, offset, data); return data; } static void musb_default_writeb(void __iomem *addr, u32 offset, u8 data) { trace_musb_writeb(__builtin_return_address(0), addr, offset, data); __raw_writeb(data, addr + offset); } static u16 musb_default_readw(void __iomem *addr, u32 offset) { u16 data = __raw_readw(addr + offset); trace_musb_readw(__builtin_return_address(0), addr, offset, data); return data; } static void musb_default_writew(void __iomem *addr, u32 offset, u16 data) { trace_musb_writew(__builtin_return_address(0), addr, offset, data); __raw_writew(data, addr + offset); } static u16 musb_default_get_toggle(struct musb_qh *qh, int is_out) { void __iomem *epio = qh->hw_ep->regs; u16 csr; if (is_out) csr = musb_readw(epio, MUSB_TXCSR) & MUSB_TXCSR_H_DATATOGGLE; else csr = musb_readw(epio, MUSB_RXCSR) & MUSB_RXCSR_H_DATATOGGLE; return csr; } static u16 musb_default_set_toggle(struct musb_qh *qh, int is_out, struct urb *urb) { u16 csr; u16 toggle; toggle = usb_gettoggle(urb->dev, qh->epnum, is_out); if (is_out) csr = toggle ? (MUSB_TXCSR_H_WR_DATATOGGLE | MUSB_TXCSR_H_DATATOGGLE) : MUSB_TXCSR_CLRDATATOG; else csr = toggle ? (MUSB_RXCSR_H_WR_DATATOGGLE | MUSB_RXCSR_H_DATATOGGLE) : 0; return csr; } /* * Load an endpoint's FIFO */ static void musb_default_write_fifo(struct musb_hw_ep *hw_ep, u16 len, const u8 *src) { struct musb *musb = hw_ep->musb; void __iomem *fifo = hw_ep->fifo; if (unlikely(len == 0)) return; prefetch((u8 *)src); dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n", 'T', hw_ep->epnum, fifo, len, src); /* we can't assume unaligned reads work */ if (likely((0x01 & (unsigned long) src) == 0)) { u16 index = 0; /* best case is 32bit-aligned source address */ if ((0x02 & (unsigned long) src) == 0) { if (len >= 4) { iowrite32_rep(fifo, src + index, len >> 2); index += len & ~0x03; } if (len & 0x02) { __raw_writew(*(u16 *)&src[index], fifo); index += 2; } } else { if (len >= 2) { iowrite16_rep(fifo, src + index, len >> 1); index += len & ~0x01; } } if (len & 0x01) __raw_writeb(src[index], fifo); } else { /* byte aligned */ iowrite8_rep(fifo, src, len); } } /* * Unload an endpoint's FIFO */ static void musb_default_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst) { struct musb *musb = hw_ep->musb; void __iomem *fifo = hw_ep->fifo; if (unlikely(len == 0)) return; dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n", 'R', hw_ep->epnum, fifo, len, dst); /* we can't assume unaligned writes work */ if (likely((0x01 & (unsigned long) dst) == 0)) { u16 index = 0; /* best case is 32bit-aligned destination address */ if ((0x02 & (unsigned long) dst) == 0) { if (len >= 4) { ioread32_rep(fifo, dst, len >> 2); index = len & ~0x03; } if (len & 0x02) { *(u16 *)&dst[index] = __raw_readw(fifo); index += 2; } } else { if (len >= 2) { ioread16_rep(fifo, dst, len >> 1); index = len & ~0x01; } } if (len & 0x01) dst[index] = __raw_readb(fifo); } else { /* byte aligned */ ioread8_rep(fifo, dst, len); } } /* * Old style IO functions */ u8 (*musb_readb)(void __iomem *addr, u32 offset); EXPORT_SYMBOL_GPL(musb_readb); void (*musb_writeb)(void __iomem *addr, u32 offset, u8 data); EXPORT_SYMBOL_GPL(musb_writeb); u8 (*musb_clearb)(void __iomem *addr, u32 offset); EXPORT_SYMBOL_GPL(musb_clearb); u16 (*musb_readw)(void __iomem *addr, u32 offset); EXPORT_SYMBOL_GPL(musb_readw); void (*musb_writew)(void __iomem *addr, u32 offset, u16 data); EXPORT_SYMBOL_GPL(musb_writew); u16 (*musb_clearw)(void __iomem *addr, u32 offset); EXPORT_SYMBOL_GPL(musb_clearw); u32 musb_readl(void __iomem *addr, u32 offset) { u32 data = __raw_readl(addr + offset); trace_musb_readl(__builtin_return_address(0), addr, offset, data); return data; } EXPORT_SYMBOL_GPL(musb_readl); void musb_writel(void __iomem *addr, u32 offset, u32 data) { trace_musb_writel(__builtin_return_address(0), addr, offset, data); __raw_writel(data, addr + offset); } EXPORT_SYMBOL_GPL(musb_writel); #ifndef CONFIG_MUSB_PIO_ONLY struct dma_controller * (*musb_dma_controller_create)(struct musb *musb, void __iomem *base); EXPORT_SYMBOL(musb_dma_controller_create); void (*musb_dma_controller_destroy)(struct dma_controller *c); EXPORT_SYMBOL(musb_dma_controller_destroy); #endif /* * New style IO functions */ void musb_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst) { return hw_ep->musb->io.read_fifo(hw_ep, len, dst); } void musb_write_fifo(struct musb_hw_ep *hw_ep, u16 len, const u8 *src) { return hw_ep->musb->io.write_fifo(hw_ep, len, src); } static u8 musb_read_devctl(struct musb *musb) { return musb_readb(musb->mregs, MUSB_DEVCTL); } /** * musb_set_host - set and initialize host mode * @musb: musb controller driver data * * At least some musb revisions need to enable devctl session bit in * peripheral mode to switch to host mode. Initializes things to host * mode and sets A_IDLE. SoC glue needs to advance state further * based on phy provided VBUS state. * * Note that the SoC glue code may need to wait for musb to settle * on enable before calling this to avoid babble. */ int musb_set_host(struct musb *musb) { int error = 0; u8 devctl; if (!musb) return -EINVAL; devctl = musb_read_devctl(musb); if (!(devctl & MUSB_DEVCTL_BDEVICE)) { trace_musb_state(musb, devctl, "Already in host mode"); goto init_data; } devctl |= MUSB_DEVCTL_SESSION; musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); error = readx_poll_timeout(musb_read_devctl, musb, devctl, !(devctl & MUSB_DEVCTL_BDEVICE), 5000, 1000000); if (error) { dev_err(musb->controller, "%s: could not set host: %02x\n", __func__, devctl); return error; } devctl = musb_read_devctl(musb); trace_musb_state(musb, devctl, "Host mode set"); init_data: musb->is_active = 1; musb_set_state(musb, OTG_STATE_A_IDLE); MUSB_HST_MODE(musb); return error; } EXPORT_SYMBOL_GPL(musb_set_host); /** * musb_set_peripheral - set and initialize peripheral mode * @musb: musb controller driver data * * Clears devctl session bit and initializes things for peripheral * mode and sets B_IDLE. SoC glue needs to advance state further * based on phy provided VBUS state. */ int musb_set_peripheral(struct musb *musb) { int error = 0; u8 devctl; if (!musb) return -EINVAL; devctl = musb_read_devctl(musb); if (devctl & MUSB_DEVCTL_BDEVICE) { trace_musb_state(musb, devctl, "Already in peripheral mode"); goto init_data; } devctl &= ~MUSB_DEVCTL_SESSION; musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); error = readx_poll_timeout(musb_read_devctl, musb, devctl, devctl & MUSB_DEVCTL_BDEVICE, 5000, 1000000); if (error) { dev_err(musb->controller, "%s: could not set peripheral: %02x\n", __func__, devctl); return error; } devctl = musb_read_devctl(musb); trace_musb_state(musb, devctl, "Peripheral mode set"); init_data: musb->is_active = 0; musb_set_state(musb, OTG_STATE_B_IDLE); MUSB_DEV_MODE(musb); return error; } EXPORT_SYMBOL_GPL(musb_set_peripheral); /*-------------------------------------------------------------------------*/ /* for high speed test mode; see USB 2.0 spec 7.1.20 */ static const u8 musb_test_packet[53] = { /* implicit SYNC then DATA0 to start */ /* JKJKJKJK x9 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* JJKKJJKK x8 */ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, /* JJJJKKKK x8 */ 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, /* JJJJJJJKKKKKKK x8 */ 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* JJJJJJJK x8 */ 0x7f, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd, /* JKKKKKKK x10, JK */ 0xfc, 0x7e, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd, 0x7e /* implicit CRC16 then EOP to end */ }; void musb_load_testpacket(struct musb *musb) { void __iomem *regs = musb->endpoints[0].regs; musb_ep_select(musb->mregs, 0); musb_write_fifo(musb->control_ep, sizeof(musb_test_packet), musb_test_packet); musb_writew(regs, MUSB_CSR0, MUSB_CSR0_TXPKTRDY); } /*-------------------------------------------------------------------------*/ /* * Handles OTG hnp timeouts, such as b_ase0_brst */ static void musb_otg_timer_func(struct timer_list *t) { struct musb *musb = from_timer(musb, t, otg_timer); unsigned long flags; spin_lock_irqsave(&musb->lock, flags); switch (musb_get_state(musb)) { case OTG_STATE_B_WAIT_ACON: musb_dbg(musb, "HNP: b_wait_acon timeout; back to b_peripheral"); musb_g_disconnect(musb); musb_set_state(musb, OTG_STATE_B_PERIPHERAL); musb->is_active = 0; break; case OTG_STATE_A_SUSPEND: case OTG_STATE_A_WAIT_BCON: musb_dbg(musb, "HNP: %s timeout", musb_otg_state_string(musb)); musb_platform_set_vbus(musb, 0); musb_set_state(musb, OTG_STATE_A_WAIT_VFALL); break; default: musb_dbg(musb, "HNP: Unhandled mode %s", musb_otg_state_string(musb)); } spin_unlock_irqrestore(&musb->lock, flags); } /* * Stops the HNP transition. Caller must take care of locking. */ void musb_hnp_stop(struct musb *musb) { struct usb_hcd *hcd = musb->hcd; void __iomem *mbase = musb->mregs; u8 reg; musb_dbg(musb, "HNP: stop from %s", musb_otg_state_string(musb)); switch (musb_get_state(musb)) { case OTG_STATE_A_PERIPHERAL: musb_g_disconnect(musb); musb_dbg(musb, "HNP: back to %s", musb_otg_state_string(musb)); break; case OTG_STATE_B_HOST: musb_dbg(musb, "HNP: Disabling HR"); if (hcd) hcd->self.is_b_host = 0; musb_set_state(musb, OTG_STATE_B_PERIPHERAL); MUSB_DEV_MODE(musb); reg = musb_readb(mbase, MUSB_POWER); reg |= MUSB_POWER_SUSPENDM; musb_writeb(mbase, MUSB_POWER, reg); /* REVISIT: Start SESSION_REQUEST here? */ break; default: musb_dbg(musb, "HNP: Stopping in unknown state %s", musb_otg_state_string(musb)); } /* * When returning to A state after HNP, avoid hub_port_rebounce(), * which cause occasional OPT A "Did not receive reset after connect" * errors. */ musb->port1_status &= ~(USB_PORT_STAT_C_CONNECTION << 16); } static void musb_recover_from_babble(struct musb *musb); static void musb_handle_intr_resume(struct musb *musb, u8 devctl) { musb_dbg(musb, "RESUME (%s)", musb_otg_state_string(musb)); if (devctl & MUSB_DEVCTL_HM) { switch (musb_get_state(musb)) { case OTG_STATE_A_SUSPEND: /* remote wakeup? */ musb->port1_status |= (USB_PORT_STAT_C_SUSPEND << 16) | MUSB_PORT_STAT_RESUME; musb->rh_timer = jiffies + msecs_to_jiffies(USB_RESUME_TIMEOUT); musb_set_state(musb, OTG_STATE_A_HOST); musb->is_active = 1; musb_host_resume_root_hub(musb); schedule_delayed_work(&musb->finish_resume_work, msecs_to_jiffies(USB_RESUME_TIMEOUT)); break; case OTG_STATE_B_WAIT_ACON: musb_set_state(musb, OTG_STATE_B_PERIPHERAL); musb->is_active = 1; MUSB_DEV_MODE(musb); break; default: WARNING("bogus %s RESUME (%s)\n", "host", musb_otg_state_string(musb)); } } else { switch (musb_get_state(musb)) { case OTG_STATE_A_SUSPEND: /* possibly DISCONNECT is upcoming */ musb_set_state(musb, OTG_STATE_A_HOST); musb_host_resume_root_hub(musb); break; case OTG_STATE_B_WAIT_ACON: case OTG_STATE_B_PERIPHERAL: /* disconnect while suspended? we may * not get a disconnect irq... */ if ((devctl & MUSB_DEVCTL_VBUS) != (3 << MUSB_DEVCTL_VBUS_SHIFT) ) { musb->int_usb |= MUSB_INTR_DISCONNECT; musb->int_usb &= ~MUSB_INTR_SUSPEND; break; } musb_g_resume(musb); break; case OTG_STATE_B_IDLE: musb->int_usb &= ~MUSB_INTR_SUSPEND; break; default: WARNING("bogus %s RESUME (%s)\n", "peripheral", musb_otg_state_string(musb)); } } } /* return IRQ_HANDLED to tell the caller to return immediately */ static irqreturn_t musb_handle_intr_sessreq(struct musb *musb, u8 devctl) { void __iomem *mbase = musb->mregs; if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS && (devctl & MUSB_DEVCTL_BDEVICE)) { musb_dbg(musb, "SessReq while on B state"); return IRQ_HANDLED; } musb_dbg(musb, "SESSION_REQUEST (%s)", musb_otg_state_string(musb)); /* IRQ arrives from ID pin sense or (later, if VBUS power * is removed) SRP. responses are time critical: * - turn on VBUS (with silicon-specific mechanism) * - go through A_WAIT_VRISE * - ... to A_WAIT_BCON. * a_wait_vrise_tmout triggers VBUS_ERROR transitions */ musb_writeb(mbase, MUSB_DEVCTL, MUSB_DEVCTL_SESSION); musb->ep0_stage = MUSB_EP0_START; musb_set_state(musb, OTG_STATE_A_IDLE); MUSB_HST_MODE(musb); musb_platform_set_vbus(musb, 1); return IRQ_NONE; } static void musb_handle_intr_vbuserr(struct musb *musb, u8 devctl) { int ignore = 0; /* During connection as an A-Device, we may see a short * current spikes causing voltage drop, because of cable * and peripheral capacitance combined with vbus draw. * (So: less common with truly self-powered devices, where * vbus doesn't act like a power supply.) * * Such spikes are short; usually less than ~500 usec, max * of ~2 msec. That is, they're not sustained overcurrent * errors, though they're reported using VBUSERROR irqs. * * Workarounds: (a) hardware: use self powered devices. * (b) software: ignore non-repeated VBUS errors. * * REVISIT: do delays from lots of DEBUG_KERNEL checks * make trouble here, keeping VBUS < 4.4V ? */ switch (musb_get_state(musb)) { case OTG_STATE_A_HOST: /* recovery is dicey once we've gotten past the * initial stages of enumeration, but if VBUS * stayed ok at the other end of the link, and * another reset is due (at least for high speed, * to redo the chirp etc), it might work OK... */ case OTG_STATE_A_WAIT_BCON: case OTG_STATE_A_WAIT_VRISE: if (musb->vbuserr_retry) { void __iomem *mbase = musb->mregs; musb->vbuserr_retry--; ignore = 1; devctl |= MUSB_DEVCTL_SESSION; musb_writeb(mbase, MUSB_DEVCTL, devctl); } else { musb->port1_status |= USB_PORT_STAT_OVERCURRENT | (USB_PORT_STAT_C_OVERCURRENT << 16); } break; default: break; } dev_printk(ignore ? KERN_DEBUG : KERN_ERR, musb->controller, "VBUS_ERROR in %s (%02x, %s), retry #%d, port1 %08x\n", musb_otg_state_string(musb), devctl, ({ char *s; switch (devctl & MUSB_DEVCTL_VBUS) { case 0 << MUSB_DEVCTL_VBUS_SHIFT: s = "<SessEnd"; break; case 1 << MUSB_DEVCTL_VBUS_SHIFT: s = "<AValid"; break; case 2 << MUSB_DEVCTL_VBUS_SHIFT: s = "<VBusValid"; break; /* case 3 << MUSB_DEVCTL_VBUS_SHIFT: */ default: s = "VALID"; break; } s; }), VBUSERR_RETRY_COUNT - musb->vbuserr_retry, musb->port1_status); /* go through A_WAIT_VFALL then start a new session */ if (!ignore) musb_platform_set_vbus(musb, 0); } static void musb_handle_intr_suspend(struct musb *musb, u8 devctl) { musb_dbg(musb, "SUSPEND (%s) devctl %02x", musb_otg_state_string(musb), devctl); switch (musb_get_state(musb)) { case OTG_STATE_A_PERIPHERAL: /* We also come here if the cable is removed, since * this silicon doesn't report ID-no-longer-grounded. * * We depend on T(a_wait_bcon) to shut us down, and * hope users don't do anything dicey during this * undesired detour through A_WAIT_BCON. */ musb_hnp_stop(musb); musb_host_resume_root_hub(musb); musb_root_disconnect(musb); musb_platform_try_idle(musb, jiffies + msecs_to_jiffies(musb->a_wait_bcon ? : OTG_TIME_A_WAIT_BCON)); break; case OTG_STATE_B_IDLE: if (!musb->is_active) break; fallthrough; case OTG_STATE_B_PERIPHERAL: musb_g_suspend(musb); musb->is_active = musb->g.b_hnp_enable; if (musb->is_active) { musb_set_state(musb, OTG_STATE_B_WAIT_ACON); musb_dbg(musb, "HNP: Setting timer for b_ase0_brst"); mod_timer(&musb->otg_timer, jiffies + msecs_to_jiffies( OTG_TIME_B_ASE0_BRST)); } break; case OTG_STATE_A_WAIT_BCON: if (musb->a_wait_bcon != 0) musb_platform_try_idle(musb, jiffies + msecs_to_jiffies(musb->a_wait_bcon)); break; case OTG_STATE_A_HOST: musb_set_state(musb, OTG_STATE_A_SUSPEND); musb->is_active = musb->hcd->self.b_hnp_enable; break; case OTG_STATE_B_HOST: /* Transition to B_PERIPHERAL, see 6.8.2.6 p 44 */ musb_dbg(musb, "REVISIT: SUSPEND as B_HOST"); break; default: /* "should not happen" */ musb->is_active = 0; break; } } static void musb_handle_intr_connect(struct musb *musb, u8 devctl, u8 int_usb) { struct usb_hcd *hcd = musb->hcd; musb->is_active = 1; musb->ep0_stage = MUSB_EP0_START; musb->intrtxe = musb->epmask; musb_writew(musb->mregs, MUSB_INTRTXE, musb->intrtxe); musb->intrrxe = musb->epmask & 0xfffe; musb_writew(musb->mregs, MUSB_INTRRXE, musb->intrrxe); musb_writeb(musb->mregs, MUSB_INTRUSBE, 0xf7); musb->port1_status &= ~(USB_PORT_STAT_LOW_SPEED |USB_PORT_STAT_HIGH_SPEED |USB_PORT_STAT_ENABLE ); musb->port1_status |= USB_PORT_STAT_CONNECTION |(USB_PORT_STAT_C_CONNECTION << 16); /* high vs full speed is just a guess until after reset */ if (devctl & MUSB_DEVCTL_LSDEV) musb->port1_status |= USB_PORT_STAT_LOW_SPEED; /* indicate new connection to OTG machine */ switch (musb_get_state(musb)) { case OTG_STATE_B_PERIPHERAL: if (int_usb & MUSB_INTR_SUSPEND) { musb_dbg(musb, "HNP: SUSPEND+CONNECT, now b_host"); int_usb &= ~MUSB_INTR_SUSPEND; goto b_host; } else musb_dbg(musb, "CONNECT as b_peripheral???"); break; case OTG_STATE_B_WAIT_ACON: musb_dbg(musb, "HNP: CONNECT, now b_host"); b_host: musb_set_state(musb, OTG_STATE_B_HOST); if (musb->hcd) musb->hcd->self.is_b_host = 1; del_timer(&musb->otg_timer); break; default: if ((devctl & MUSB_DEVCTL_VBUS) == (3 << MUSB_DEVCTL_VBUS_SHIFT)) { musb_set_state(musb, OTG_STATE_A_HOST); if (hcd) hcd->self.is_b_host = 0; } break; } musb_host_poke_root_hub(musb); musb_dbg(musb, "CONNECT (%s) devctl %02x", musb_otg_state_string(musb), devctl); } static void musb_handle_intr_disconnect(struct musb *musb, u8 devctl) { musb_dbg(musb, "DISCONNECT (%s) as %s, devctl %02x", musb_otg_state_string(musb), MUSB_MODE(musb), devctl); switch (musb_get_state(musb)) { case OTG_STATE_A_HOST: case OTG_STATE_A_SUSPEND: musb_host_resume_root_hub(musb); musb_root_disconnect(musb); if (musb->a_wait_bcon != 0) musb_platform_try_idle(musb, jiffies + msecs_to_jiffies(musb->a_wait_bcon)); break; case OTG_STATE_B_HOST: /* REVISIT this behaves for "real disconnect" * cases; make sure the other transitions from * from B_HOST act right too. The B_HOST code * in hnp_stop() is currently not used... */ musb_root_disconnect(musb); if (musb->hcd) musb->hcd->self.is_b_host = 0; musb_set_state(musb, OTG_STATE_B_PERIPHERAL); MUSB_DEV_MODE(musb); musb_g_disconnect(musb); break; case OTG_STATE_A_PERIPHERAL: musb_hnp_stop(musb); musb_root_disconnect(musb); fallthrough; case OTG_STATE_B_WAIT_ACON: case OTG_STATE_B_PERIPHERAL: case OTG_STATE_B_IDLE: musb_g_disconnect(musb); break; default: WARNING("unhandled DISCONNECT transition (%s)\n", musb_otg_state_string(musb)); break; } } /* * mentor saves a bit: bus reset and babble share the same irq. * only host sees babble; only peripheral sees bus reset. */ static void musb_handle_intr_reset(struct musb *musb) { if (is_host_active(musb)) { /* * When BABBLE happens what we can depends on which * platform MUSB is running, because some platforms * implemented proprietary means for 'recovering' from * Babble conditions. One such platform is AM335x. In * most cases, however, the only thing we can do is * drop the session. */ dev_err(musb->controller, "Babble\n"); musb_recover_from_babble(musb); } else { musb_dbg(musb, "BUS RESET as %s", musb_otg_state_string(musb)); switch (musb_get_state(musb)) { case OTG_STATE_A_SUSPEND: musb_g_reset(musb); fallthrough; case OTG_STATE_A_WAIT_BCON: /* OPT TD.4.7-900ms */ /* never use invalid T(a_wait_bcon) */ musb_dbg(musb, "HNP: in %s, %d msec timeout", musb_otg_state_string(musb), TA_WAIT_BCON(musb)); mod_timer(&musb->otg_timer, jiffies + msecs_to_jiffies(TA_WAIT_BCON(musb))); break; case OTG_STATE_A_PERIPHERAL: del_timer(&musb->otg_timer); musb_g_reset(musb); break; case OTG_STATE_B_WAIT_ACON: musb_dbg(musb, "HNP: RESET (%s), to b_peripheral", musb_otg_state_string(musb)); musb_set_state(musb, OTG_STATE_B_PERIPHERAL); musb_g_reset(musb); break; case OTG_STATE_B_IDLE: musb_set_state(musb, OTG_STATE_B_PERIPHERAL); fallthrough; case OTG_STATE_B_PERIPHERAL: musb_g_reset(musb); break; default: musb_dbg(musb, "Unhandled BUS RESET as %s", musb_otg_state_string(musb)); } } } /* * Interrupt Service Routine to record USB "global" interrupts. * Since these do not happen often and signify things of * paramount importance, it seems OK to check them individually; * the order of the tests is specified in the manual * * @param musb instance pointer * @param int_usb register contents * @param devctl */ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb, u8 devctl) { irqreturn_t handled = IRQ_NONE; musb_dbg(musb, "<== DevCtl=%02x, int_usb=0x%x", devctl, int_usb); /* in host mode, the peripheral may issue remote wakeup. * in peripheral mode, the host may resume the link. * spurious RESUME irqs happen too, paired with SUSPEND. */ if (int_usb & MUSB_INTR_RESUME) { musb_handle_intr_resume(musb, devctl); handled = IRQ_HANDLED; } /* see manual for the order of the tests */ if (int_usb & MUSB_INTR_SESSREQ) { if (musb_handle_intr_sessreq(musb, devctl)) return IRQ_HANDLED; handled = IRQ_HANDLED; } if (int_usb & MUSB_INTR_VBUSERROR) { musb_handle_intr_vbuserr(musb, devctl); handled = IRQ_HANDLED; } if (int_usb & MUSB_INTR_SUSPEND) { musb_handle_intr_suspend(musb, devctl); handled = IRQ_HANDLED; } if (int_usb & MUSB_INTR_CONNECT) { musb_handle_intr_connect(musb, devctl, int_usb); handled = IRQ_HANDLED; } if (int_usb & MUSB_INTR_DISCONNECT) { musb_handle_intr_disconnect(musb, devctl); handled = IRQ_HANDLED; } if (int_usb & MUSB_INTR_RESET) { musb_handle_intr_reset(musb); handled = IRQ_HANDLED; } #if 0 /* REVISIT ... this would be for multiplexing periodic endpoints, or * supporting transfer phasing to prevent exceeding ISO bandwidth * limits of a given frame or microframe. * * It's not needed for peripheral side, which dedicates endpoints; * though it _might_ use SOF irqs for other purposes. * * And it's not currently needed for host side, which also dedicates * endpoints, relies on TX/RX interval registers, and isn't claimed * to support ISO transfers yet. */ if (int_usb & MUSB_INTR_SOF) { void __iomem *mbase = musb->mregs; struct musb_hw_ep *ep; u8 epnum; u16 frame; dev_dbg(musb->controller, "START_OF_FRAME\n"); handled = IRQ_HANDLED; /* start any periodic Tx transfers waiting for current frame */ frame = musb_readw(mbase, MUSB_FRAME); ep = musb->endpoints; for (epnum = 1; (epnum < musb->nr_endpoints) && (musb->epmask >= (1 << epnum)); epnum++, ep++) { /* * FIXME handle framecounter wraps (12 bits) * eliminate duplicated StartUrb logic */ if (ep->dwWaitFrame >= frame) { ep->dwWaitFrame = 0; pr_debug("SOF --> periodic TX%s on %d\n", ep->tx_channel ? " DMA" : "", epnum); if (!ep->tx_channel) musb_h_tx_start(musb, epnum); else cppi_hostdma_start(musb, epnum); } } /* end of for loop */ } #endif schedule_delayed_work(&musb->irq_work, 0); return handled; } /*-------------------------------------------------------------------------*/ static void musb_disable_interrupts(struct musb *musb) { void __iomem *mbase = musb->mregs; /* disable interrupts */ musb_writeb(mbase, MUSB_INTRUSBE, 0); musb->intrtxe = 0; musb_writew(mbase, MUSB_INTRTXE, 0); musb->intrrxe = 0; musb_writew(mbase, MUSB_INTRRXE, 0); /* flush pending interrupts */ musb_clearb(mbase, MUSB_INTRUSB); musb_clearw(mbase, MUSB_INTRTX); musb_clearw(mbase, MUSB_INTRRX); } static void musb_enable_interrupts(struct musb *musb) { void __iomem *regs = musb->mregs; /* Set INT enable registers, enable interrupts */ musb->intrtxe = musb->epmask; musb_writew(regs, MUSB_INTRTXE, musb->intrtxe); musb->intrrxe = musb->epmask & 0xfffe; musb_writew(regs, MUSB_INTRRXE, musb->intrrxe); musb_writeb(regs, MUSB_INTRUSBE, 0xf7); } /* * Program the HDRC to start (enable interrupts, dma, etc.). */ void musb_start(struct musb *musb) { void __iomem *regs = musb->mregs; u8 devctl = musb_readb(regs, MUSB_DEVCTL); u8 power; musb_dbg(musb, "<== devctl %02x", devctl); musb_enable_interrupts(musb); musb_writeb(regs, MUSB_TESTMODE, 0); power = MUSB_POWER_ISOUPDATE; /* * treating UNKNOWN as unspecified maximum speed, in which case * we will default to high-speed. */ if (musb->config->maximum_speed == USB_SPEED_HIGH || musb->config->maximum_speed == USB_SPEED_UNKNOWN) power |= MUSB_POWER_HSENAB; musb_writeb(regs, MUSB_POWER, power); musb->is_active = 0; devctl = musb_readb(regs, MUSB_DEVCTL); devctl &= ~MUSB_DEVCTL_SESSION; /* session started after: * (a) ID-grounded irq, host mode; * (b) vbus present/connect IRQ, peripheral mode; * (c) peripheral initiates, using SRP */ if (musb->port_mode != MUSB_HOST && musb_get_state(musb) != OTG_STATE_A_WAIT_BCON && (devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS) { musb->is_active = 1; } else { devctl |= MUSB_DEVCTL_SESSION; } musb_platform_enable(musb); musb_writeb(regs, MUSB_DEVCTL, devctl); } /* * Make the HDRC stop (disable interrupts, etc.); * reversible by musb_start * called on gadget driver unregister * with controller locked, irqs blocked * acts as a NOP unless some role activated the hardware */ void musb_stop(struct musb *musb) { /* stop IRQs, timers, ... */ musb_platform_disable(musb); musb_disable_interrupts(musb); musb_writeb(musb->mregs, MUSB_DEVCTL, 0); /* FIXME * - mark host and/or peripheral drivers unusable/inactive * - disable DMA (and enable it in HdrcStart) * - make sure we can musb_start() after musb_stop(); with * OTG mode, gadget driver module rmmod/modprobe cycles that * - ... */ musb_platform_try_idle(musb, 0); } /*-------------------------------------------------------------------------*/ /* * The silicon either has hard-wired endpoint configurations, or else * "dynamic fifo" sizing. The driver has support for both, though at this * writing only the dynamic sizing is very well tested. Since we switched * away from compile-time hardware parameters, we can no longer rely on * dead code elimination to leave only the relevant one in the object file. * * We don't currently use dynamic fifo setup capability to do anything * more than selecting one of a bunch of predefined configurations. */ static ushort fifo_mode; /* "modprobe ... fifo_mode=1" etc */ module_param(fifo_mode, ushort, 0); MODULE_PARM_DESC(fifo_mode, "initial endpoint configuration"); /* * tables defining fifo_mode values. define more if you like. * for host side, make sure both halves of ep1 are set up. */ /* mode 0 - fits in 2KB */ static struct musb_fifo_cfg mode_0_cfg[] = { { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, }, { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, }, { .hw_ep_num = 2, .style = FIFO_RXTX, .maxpacket = 512, }, { .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, }, { .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, }, }; /* mode 1 - fits in 4KB */ static struct musb_fifo_cfg mode_1_cfg[] = { { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, .mode = BUF_DOUBLE, }, { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, .mode = BUF_DOUBLE, }, { .hw_ep_num = 2, .style = FIFO_RXTX, .maxpacket = 512, .mode = BUF_DOUBLE, }, { .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, }, { .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, }, }; /* mode 2 - fits in 4KB */ static struct musb_fifo_cfg mode_2_cfg[] = { { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, }, { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, }, { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, }, { .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, }, { .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 960, }, { .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 1024, }, }; /* mode 3 - fits in 4KB */ static struct musb_fifo_cfg mode_3_cfg[] = { { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, .mode = BUF_DOUBLE, }, { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, .mode = BUF_DOUBLE, }, { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, }, { .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, }, { .hw_ep_num = 3, .style = FIFO_RXTX, .maxpacket = 256, }, { .hw_ep_num = 4, .style = FIFO_RXTX, .maxpacket = 256, }, }; /* mode 4 - fits in 16KB */ static struct musb_fifo_cfg mode_4_cfg[] = { { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, }, { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, }, { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, }, { .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, }, { .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, }, { .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, }, { .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, }, { .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, }, { .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, }, { .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, }, { .hw_ep_num = 6, .style = FIFO_TX, .maxpacket = 512, }, { .hw_ep_num = 6, .style = FIFO_RX, .maxpacket = 512, }, { .hw_ep_num = 7, .style = FIFO_TX, .maxpacket = 512, }, { .hw_ep_num = 7, .style = FIFO_RX, .maxpacket = 512, }, { .hw_ep_num = 8, .style = FIFO_TX, .maxpacket = 512, }, { .hw_ep_num = 8, .style = FIFO_RX, .maxpacket = 512, }, { .hw_ep_num = 9, .style = FIFO_TX, .maxpacket = 512, }, { .hw_ep_num = 9, .style = FIFO_RX, .maxpacket = 512, }, { .hw_ep_num = 10, .style = FIFO_TX, .maxpacket = 256, }, { .hw_ep_num = 10, .style = FIFO_RX, .maxpacket = 64, }, { .hw_ep_num = 11, .style = FIFO_TX, .maxpacket = 256, }, { .hw_ep_num = 11, .style = FIFO_RX, .maxpacket = 64, }, { .hw_ep_num = 12, .style = FIFO_TX, .maxpacket = 256, }, { .hw_ep_num = 12, .style = FIFO_RX, .maxpacket = 64, }, { .hw_ep_num = 13, .style = FIFO_RXTX, .maxpacket = 4096, }, { .hw_ep_num = 14, .style = FIFO_RXTX, .maxpacket = 1024, }, { .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, }, }; /* mode 5 - fits in 8KB */ static struct musb_fifo_cfg mode_5_cfg[] = { { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, }, { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, }, { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, }, { .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, }, { .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, }, { .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, }, { .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, }, { .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, }, { .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, }, { .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, }, { .hw_ep_num = 6, .style = FIFO_TX, .maxpacket = 32, }, { .hw_ep_num = 6, .style = FIFO_RX, .maxpacket = 32, }, { .hw_ep_num = 7, .style = FIFO_TX, .maxpacket = 32, }, { .hw_ep_num = 7, .style = FIFO_RX, .maxpacket = 32, }, { .hw_ep_num = 8, .style = FIFO_TX, .maxpacket = 32, }, { .hw_ep_num = 8, .style = FIFO_RX, .maxpacket = 32, }, { .hw_ep_num = 9, .style = FIFO_TX, .maxpacket = 32, }, { .hw_ep_num = 9, .style = FIFO_RX, .maxpacket = 32, }, { .hw_ep_num = 10, .style = FIFO_TX, .maxpacket = 32, }, { .hw_ep_num = 10, .style = FIFO_RX, .maxpacket = 32, }, { .hw_ep_num = 11, .style = FIFO_TX, .maxpacket = 32, }, { .hw_ep_num = 11, .style = FIFO_RX, .maxpacket = 32, }, { .hw_ep_num = 12, .style = FIFO_TX, .maxpacket = 32, }, { .hw_ep_num = 12, .style = FIFO_RX, .maxpacket = 32, }, { .hw_ep_num = 13, .style = FIFO_RXTX, .maxpacket = 512, }, { .hw_ep_num = 14, .style = FIFO_RXTX, .maxpacket = 1024, }, { .hw_ep_num = 15, .style = FIFO_RXTX, .maxpacket = 1024, }, }; /* * configure a fifo; for non-shared endpoints, this may be called * once for a tx fifo and once for an rx fifo. * * returns negative errno or offset for next fifo. */ static int fifo_setup(struct musb *musb, struct musb_hw_ep *hw_ep, const struct musb_fifo_cfg *cfg, u16 offset) { void __iomem *mbase = musb->mregs; int size = 0; u16 maxpacket = cfg->maxpacket; u16 c_off = offset >> 3; u8 c_size; /* expect hw_ep has already been zero-initialized */ size = ffs(max(maxpacket, (u16) 8)) - 1; maxpacket = 1 << size; c_size = size - 3; if (cfg->mode == BUF_DOUBLE) { if ((offset + (maxpacket << 1)) > (1 << (musb->config->ram_bits + 2))) return -EMSGSIZE; c_size |= MUSB_FIFOSZ_DPB; } else { if ((offset + maxpacket) > (1 << (musb->config->ram_bits + 2))) return -EMSGSIZE; } /* configure the FIFO */ musb_writeb(mbase, MUSB_INDEX, hw_ep->epnum); /* EP0 reserved endpoint for control, bidirectional; * EP1 reserved for bulk, two unidirectional halves. */ if (hw_ep->epnum == 1) musb->bulk_ep = hw_ep; /* REVISIT error check: be sure ep0 can both rx and tx ... */ switch (cfg->style) { case FIFO_TX: musb_writeb(mbase, MUSB_TXFIFOSZ, c_size); musb_writew(mbase, MUSB_TXFIFOADD, c_off); hw_ep->tx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB); hw_ep->max_packet_sz_tx = maxpacket; break; case FIFO_RX: musb_writeb(mbase, MUSB_RXFIFOSZ, c_size); musb_writew(mbase, MUSB_RXFIFOADD, c_off); hw_ep->rx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB); hw_ep->max_packet_sz_rx = maxpacket; break; case FIFO_RXTX: musb_writeb(mbase, MUSB_TXFIFOSZ, c_size); musb_writew(mbase, MUSB_TXFIFOADD, c_off); hw_ep->rx_double_buffered = !!(c_size & MUSB_FIFOSZ_DPB); hw_ep->max_packet_sz_rx = maxpacket; musb_writeb(mbase, MUSB_RXFIFOSZ, c_size); musb_writew(mbase, MUSB_RXFIFOADD, c_off); hw_ep->tx_double_buffered = hw_ep->rx_double_buffered; hw_ep->max_packet_sz_tx = maxpacket; hw_ep->is_shared_fifo = true; break; } /* NOTE rx and tx endpoint irqs aren't managed separately, * which happens to be ok */ musb->epmask |= (1 << hw_ep->epnum); return offset + (maxpacket << ((c_size & MUSB_FIFOSZ_DPB) ? 1 : 0)); } static struct musb_fifo_cfg ep0_cfg = { .style = FIFO_RXTX, .maxpacket = 64, }; static int ep_config_from_table(struct musb *musb) { const struct musb_fifo_cfg *cfg; unsigned i, n; int offset; struct musb_hw_ep *hw_ep = musb->endpoints; if (musb->config->fifo_cfg) { cfg = musb->config->fifo_cfg; n = musb->config->fifo_cfg_size; goto done; } switch (fifo_mode) { default: fifo_mode = 0; fallthrough; case 0: cfg = mode_0_cfg; n = ARRAY_SIZE(mode_0_cfg); break; case 1: cfg = mode_1_cfg; n = ARRAY_SIZE(mode_1_cfg); break; case 2: cfg = mode_2_cfg; n = ARRAY_SIZE(mode_2_cfg); break; case 3: cfg = mode_3_cfg; n = ARRAY_SIZE(mode_3_cfg); break; case 4: cfg = mode_4_cfg; n = ARRAY_SIZE(mode_4_cfg); break; case 5: cfg = mode_5_cfg; n = ARRAY_SIZE(mode_5_cfg); break; } pr_debug("%s: setup fifo_mode %d\n", musb_driver_name, fifo_mode); done: offset = fifo_setup(musb, hw_ep, &ep0_cfg, 0); /* assert(offset > 0) */ /* NOTE: for RTL versions >= 1.400 EPINFO and RAMINFO would * be better than static musb->config->num_eps and DYN_FIFO_SIZE... */ for (i = 0; i < n; i++) { u8 epn = cfg->hw_ep_num; if (epn >= musb->config->num_eps) { pr_debug("%s: invalid ep %d\n", musb_driver_name, epn); return -EINVAL; } offset = fifo_setup(musb, hw_ep + epn, cfg++, offset); if (offset < 0) { pr_debug("%s: mem overrun, ep %d\n", musb_driver_name, epn); return offset; } epn++; musb->nr_endpoints = max(epn, musb->nr_endpoints); } pr_debug("%s: %d/%d max ep, %d/%d memory\n", musb_driver_name, n + 1, musb->config->num_eps * 2 - 1, offset, (1 << (musb->config->ram_bits + 2))); if (!musb->bulk_ep) { pr_debug("%s: missing bulk\n", musb_driver_name); return -EINVAL; } return 0; } /* * ep_config_from_hw - when MUSB_C_DYNFIFO_DEF is false * @param musb the controller */ static int ep_config_from_hw(struct musb *musb) { u8 epnum = 0; struct musb_hw_ep *hw_ep; void __iomem *mbase = musb->mregs; int ret = 0; musb_dbg(musb, "<== static silicon ep config"); /* FIXME pick up ep0 maxpacket size */ for (epnum = 1; epnum < musb->config->num_eps; epnum++) { musb_ep_select(mbase, epnum); hw_ep = musb->endpoints + epnum; ret = musb_read_fifosize(musb, hw_ep, epnum); if (ret < 0) break; /* FIXME set up hw_ep->{rx,tx}_double_buffered */ /* pick an RX/TX endpoint for bulk */ if (hw_ep->max_packet_sz_tx < 512 || hw_ep->max_packet_sz_rx < 512) continue; /* REVISIT: this algorithm is lazy, we should at least * try to pick a double buffered endpoint. */ if (musb->bulk_ep) continue; musb->bulk_ep = hw_ep; } if (!musb->bulk_ep) { pr_debug("%s: missing bulk\n", musb_driver_name); return -EINVAL; } return 0; } enum { MUSB_CONTROLLER_MHDRC, MUSB_CONTROLLER_HDRC, }; /* Initialize MUSB (M)HDRC part of the USB hardware subsystem; * configure endpoints, or take their config from silicon */ static int musb_core_init(u16 musb_type, struct musb *musb) { u8 reg; char *type; char aInfo[90]; void __iomem *mbase = musb->mregs; int status = 0; int i; /* log core options (read using indexed model) */ reg = musb_read_configdata(mbase); strcpy(aInfo, (reg & MUSB_CONFIGDATA_UTMIDW) ? "UTMI-16" : "UTMI-8"); if (reg & MUSB_CONFIGDATA_DYNFIFO) { strcat(aInfo, ", dyn FIFOs"); musb->dyn_fifo = true; } if (reg & MUSB_CONFIGDATA_MPRXE) { strcat(aInfo, ", bulk combine"); musb->bulk_combine = true; } if (reg & MUSB_CONFIGDATA_MPTXE) { strcat(aInfo, ", bulk split"); musb->bulk_split = true; } if (reg & MUSB_CONFIGDATA_HBRXE) { strcat(aInfo, ", HB-ISO Rx"); musb->hb_iso_rx = true; } if (reg & MUSB_CONFIGDATA_HBTXE) { strcat(aInfo, ", HB-ISO Tx"); musb->hb_iso_tx = true; } if (reg & MUSB_CONFIGDATA_SOFTCONE) strcat(aInfo, ", SoftConn"); pr_debug("%s: ConfigData=0x%02x (%s)\n", musb_driver_name, reg, aInfo); if (MUSB_CONTROLLER_MHDRC == musb_type) { musb->is_multipoint = 1; type = "M"; } else { musb->is_multipoint = 0; type = ""; if (IS_ENABLED(CONFIG_USB) && !IS_ENABLED(CONFIG_USB_OTG_DISABLE_EXTERNAL_HUB)) { pr_err("%s: kernel must disable external hubs, please fix the configuration\n", musb_driver_name); } } /* log release info */ musb->hwvers = musb_readw(mbase, MUSB_HWVERS); pr_debug("%s: %sHDRC RTL version %d.%d%s\n", musb_driver_name, type, MUSB_HWVERS_MAJOR(musb->hwvers), MUSB_HWVERS_MINOR(musb->hwvers), (musb->hwvers & MUSB_HWVERS_RC) ? "RC" : ""); /* configure ep0 */ musb_configure_ep0(musb); /* discover endpoint configuration */ musb->nr_endpoints = 1; musb->epmask = 1; if (musb->dyn_fifo) status = ep_config_from_table(musb); else status = ep_config_from_hw(musb); if (status < 0) return status; /* finish init, and print endpoint config */ for (i = 0; i < musb->nr_endpoints; i++) { struct musb_hw_ep *hw_ep = musb->endpoints + i; hw_ep->fifo = musb->io.fifo_offset(i) + mbase; #if IS_ENABLED(CONFIG_USB_MUSB_TUSB6010) if (musb->ops->quirks & MUSB_IN_TUSB) { hw_ep->fifo_async = musb->async + 0x400 + musb->io.fifo_offset(i); hw_ep->fifo_sync = musb->sync + 0x400 + musb->io.fifo_offset(i); hw_ep->fifo_sync_va = musb->sync_va + 0x400 + musb->io.fifo_offset(i); if (i == 0) hw_ep->conf = mbase - 0x400 + TUSB_EP0_CONF; else hw_ep->conf = mbase + 0x400 + (((i - 1) & 0xf) << 2); } #endif hw_ep->regs = musb->io.ep_offset(i, 0) + mbase; hw_ep->rx_reinit = 1; hw_ep->tx_reinit = 1; if (hw_ep->max_packet_sz_tx) { musb_dbg(musb, "%s: hw_ep %d%s, %smax %d", musb_driver_name, i, hw_ep->is_shared_fifo ? "shared" : "tx", hw_ep->tx_double_buffered ? "doublebuffer, " : "", hw_ep->max_packet_sz_tx); } if (hw_ep->max_packet_sz_rx && !hw_ep->is_shared_fifo) { musb_dbg(musb, "%s: hw_ep %d%s, %smax %d", musb_driver_name, i, "rx", hw_ep->rx_double_buffered ? "doublebuffer, " : "", hw_ep->max_packet_sz_rx); } if (!(hw_ep->max_packet_sz_tx || hw_ep->max_packet_sz_rx)) musb_dbg(musb, "hw_ep %d not configured", i); } return 0; } /*-------------------------------------------------------------------------*/ /* * handle all the irqs defined by the HDRC core. for now we expect: other * irq sources (phy, dma, etc) will be handled first, musb->int_* values * will be assigned, and the irq will already have been acked. * * called in irq context with spinlock held, irqs blocked */ irqreturn_t musb_interrupt(struct musb *musb) { irqreturn_t retval = IRQ_NONE; unsigned long status; unsigned long epnum; u8 devctl; if (!musb->int_usb && !musb->int_tx && !musb->int_rx) return IRQ_NONE; devctl = musb_readb(musb->mregs, MUSB_DEVCTL); trace_musb_isr(musb); /** * According to Mentor Graphics' documentation, flowchart on page 98, * IRQ should be handled as follows: * * . Resume IRQ * . Session Request IRQ * . VBUS Error IRQ * . Suspend IRQ * . Connect IRQ * . Disconnect IRQ * . Reset/Babble IRQ * . SOF IRQ (we're not using this one) * . Endpoint 0 IRQ * . TX Endpoints * . RX Endpoints * * We will be following that flowchart in order to avoid any problems * that might arise with internal Finite State Machine. */ if (musb->int_usb) retval |= musb_stage0_irq(musb, musb->int_usb, devctl); if (musb->int_tx & 1) { if (is_host_active(musb)) retval |= musb_h_ep0_irq(musb); else retval |= musb_g_ep0_irq(musb); /* we have just handled endpoint 0 IRQ, clear it */ musb->int_tx &= ~BIT(0); } status = musb->int_tx; for_each_set_bit(epnum, &status, 16) { retval = IRQ_HANDLED; if (is_host_active(musb)) musb_host_tx(musb, epnum); else musb_g_tx(musb, epnum); } status = musb->int_rx; for_each_set_bit(epnum, &status, 16) { retval = IRQ_HANDLED; if (is_host_active(musb)) musb_host_rx(musb, epnum); else musb_g_rx(musb, epnum); } return retval; } EXPORT_SYMBOL_GPL(musb_interrupt); #ifndef CONFIG_MUSB_PIO_ONLY static bool use_dma = true; /* "modprobe ... use_dma=0" etc */ module_param(use_dma, bool, 0644); MODULE_PARM_DESC(use_dma, "enable/disable use of DMA"); void musb_dma_completion(struct musb *musb, u8 epnum, u8 transmit) { /* called with controller lock already held */ if (!epnum) { if (!is_cppi_enabled(musb)) { /* endpoint 0 */ if (is_host_active(musb)) musb_h_ep0_irq(musb); else musb_g_ep0_irq(musb); } } else { /* endpoints 1..15 */ if (transmit) { if (is_host_active(musb)) musb_host_tx(musb, epnum); else musb_g_tx(musb, epnum); } else { /* receive */ if (is_host_active(musb)) musb_host_rx(musb, epnum); else musb_g_rx(musb, epnum); } } } EXPORT_SYMBOL_GPL(musb_dma_completion); #else #define use_dma 0 #endif static int (*musb_phy_callback)(enum musb_vbus_id_status status); /* * musb_mailbox - optional phy notifier function * @status phy state change * * Optionally gets called from the USB PHY. Note that the USB PHY must be * disabled at the point the phy_callback is registered or unregistered. */ int musb_mailbox(enum musb_vbus_id_status status) { if (musb_phy_callback) return musb_phy_callback(status); return -ENODEV; }; EXPORT_SYMBOL_GPL(musb_mailbox); /*-------------------------------------------------------------------------*/ static ssize_t mode_show(struct device *dev, struct device_attribute *attr, char *buf) { struct musb *musb = dev_to_musb(dev); unsigned long flags; int ret; spin_lock_irqsave(&musb->lock, flags); ret = sprintf(buf, "%s\n", musb_otg_state_string(musb)); spin_unlock_irqrestore(&musb->lock, flags); return ret; } static ssize_t mode_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) { struct musb *musb = dev_to_musb(dev); unsigned long flags; int status; spin_lock_irqsave(&musb->lock, flags); if (sysfs_streq(buf, "host")) status = musb_platform_set_mode(musb, MUSB_HOST); else if (sysfs_streq(buf, "peripheral")) status = musb_platform_set_mode(musb, MUSB_PERIPHERAL); else if (sysfs_streq(buf, "otg")) status = musb_platform_set_mode(musb, MUSB_OTG); else status = -EINVAL; spin_unlock_irqrestore(&musb->lock, flags); return (status == 0) ? n : status; } static DEVICE_ATTR_RW(mode); static ssize_t vbus_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) { struct musb *musb = dev_to_musb(dev); unsigned long flags; unsigned long val; if (sscanf(buf, "%lu", &val) < 1) { dev_err(dev, "Invalid VBUS timeout ms value\n"); return -EINVAL; } spin_lock_irqsave(&musb->lock, flags); /* force T(a_wait_bcon) to be zero/unlimited *OR* valid */ musb->a_wait_bcon = val ? max_t(int, val, OTG_TIME_A_WAIT_BCON) : 0 ; if (musb_get_state(musb) == OTG_STATE_A_WAIT_BCON) musb->is_active = 0; musb_platform_try_idle(musb, jiffies + msecs_to_jiffies(val)); spin_unlock_irqrestore(&musb->lock, flags); return n; } static ssize_t vbus_show(struct device *dev, struct device_attribute *attr, char *buf) { struct musb *musb = dev_to_musb(dev); unsigned long flags; unsigned long val; int vbus; u8 devctl; pm_runtime_get_sync(dev); spin_lock_irqsave(&musb->lock, flags); val = musb->a_wait_bcon; vbus = musb_platform_get_vbus_status(musb); if (vbus < 0) { /* Use default MUSB method by means of DEVCTL register */ devctl = musb_readb(musb->mregs, MUSB_DEVCTL); if ((devctl & MUSB_DEVCTL_VBUS) == (3 << MUSB_DEVCTL_VBUS_SHIFT)) vbus = 1; else vbus = 0; } spin_unlock_irqrestore(&musb->lock, flags); pm_runtime_put_sync(dev); return sprintf(buf, "Vbus %s, timeout %lu msec\n", vbus ? "on" : "off", val); } static DEVICE_ATTR_RW(vbus); /* Gadget drivers can't know that a host is connected so they might want * to start SRP, but users can. This allows userspace to trigger SRP. */ static ssize_t srp_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t n) { struct musb *musb = dev_to_musb(dev); unsigned short srp; if (sscanf(buf, "%hu", &srp) != 1 || (srp != 1)) { dev_err(dev, "SRP: Value must be 1\n"); return -EINVAL; } if (srp == 1) musb_g_wakeup(musb); return n; } static DEVICE_ATTR_WO(srp); static struct attribute *musb_attrs[] = { &dev_attr_mode.attr, &dev_attr_vbus.attr, &dev_attr_srp.attr, NULL }; ATTRIBUTE_GROUPS(musb); #define MUSB_QUIRK_B_INVALID_VBUS_91 (MUSB_DEVCTL_BDEVICE | \ (2 << MUSB_DEVCTL_VBUS_SHIFT) | \ MUSB_DEVCTL_SESSION) #define MUSB_QUIRK_B_DISCONNECT_99 (MUSB_DEVCTL_BDEVICE | \ (3 << MUSB_DEVCTL_VBUS_SHIFT) | \ MUSB_DEVCTL_SESSION) #define MUSB_QUIRK_A_DISCONNECT_19 ((3 << MUSB_DEVCTL_VBUS_SHIFT) | \ MUSB_DEVCTL_SESSION) static bool musb_state_needs_recheck(struct musb *musb, u8 devctl, const char *desc) { if (musb->quirk_retries && !musb->flush_irq_work) { trace_musb_state(musb, devctl, desc); schedule_delayed_work(&musb->irq_work, msecs_to_jiffies(1000)); musb->quirk_retries--; return true; } return false; } /* * Check the musb devctl session bit to determine if we want to * allow PM runtime for the device. In general, we want to keep things * active when the session bit is set except after host disconnect. * * Only called from musb_irq_work. If this ever needs to get called * elsewhere, proper locking must be implemented for musb->session. */ static void musb_pm_runtime_check_session(struct musb *musb) { u8 devctl, s; int error; devctl = musb_readb(musb->mregs, MUSB_DEVCTL); /* Handle session status quirks first */ s = MUSB_DEVCTL_FSDEV | MUSB_DEVCTL_LSDEV | MUSB_DEVCTL_HR; switch (devctl & ~s) { case MUSB_QUIRK_B_DISCONNECT_99: musb_state_needs_recheck(musb, devctl, "Poll devctl in case of suspend after disconnect"); break; case MUSB_QUIRK_B_INVALID_VBUS_91: if (musb_state_needs_recheck(musb, devctl, "Poll devctl on invalid vbus, assume no session")) return; fallthrough; case MUSB_QUIRK_A_DISCONNECT_19: if (musb_state_needs_recheck(musb, devctl, "Poll devctl on possible host mode disconnect")) return; if (!musb->session) break; trace_musb_state(musb, devctl, "Allow PM on possible host mode disconnect"); pm_runtime_mark_last_busy(musb->controller); pm_runtime_put_autosuspend(musb->controller); musb->session = false; return; default: break; } /* No need to do anything if session has not changed */ s = devctl & MUSB_DEVCTL_SESSION; if (s == musb->session) return; /* Block PM or allow PM? */ if (s) { trace_musb_state(musb, devctl, "Block PM on active session"); error = pm_runtime_get_sync(musb->controller); if (error < 0) dev_err(musb->controller, "Could not enable: %i\n", error); musb->quirk_retries = 3; /* * We can get a spurious MUSB_INTR_SESSREQ interrupt on start-up * in B-peripheral mode with nothing connected and the session * bit clears silently. Check status again in 3 seconds. */ if (devctl & MUSB_DEVCTL_BDEVICE) schedule_delayed_work(&musb->irq_work, msecs_to_jiffies(3000)); } else { trace_musb_state(musb, devctl, "Allow PM with no session"); pm_runtime_mark_last_busy(musb->controller); pm_runtime_put_autosuspend(musb->controller); } musb->session = s; } /* Only used to provide driver mode change events */ static void musb_irq_work(struct work_struct *data) { struct musb *musb = container_of(data, struct musb, irq_work.work); int error; error = pm_runtime_resume_and_get(musb->controller); if (error < 0) { dev_err(musb->controller, "Could not enable: %i\n", error); return; } musb_pm_runtime_check_session(musb); if (musb_get_state(musb) != musb->xceiv_old_state) { musb->xceiv_old_state = musb_get_state(musb); sysfs_notify(&musb->controller->kobj, NULL, "mode"); } pm_runtime_mark_last_busy(musb->controller); pm_runtime_put_autosuspend(musb->controller); } static void musb_recover_from_babble(struct musb *musb) { int ret; u8 devctl; musb_disable_interrupts(musb); /* * wait at least 320 cycles of 60MHz clock. That's 5.3us, we will give * it some slack and wait for 10us. */ udelay(10); ret = musb_platform_recover(musb); if (ret) { musb_enable_interrupts(musb); return; } /* drop session bit */ devctl = musb_readb(musb->mregs, MUSB_DEVCTL); devctl &= ~MUSB_DEVCTL_SESSION; musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); /* tell usbcore about it */ musb_root_disconnect(musb); /* * When a babble condition occurs, the musb controller * removes the session bit and the endpoint config is lost. */ if (musb->dyn_fifo) ret = ep_config_from_table(musb); else ret = ep_config_from_hw(musb); /* restart session */ if (ret == 0) musb_start(musb); } /* -------------------------------------------------------------------------- * Init support */ static struct musb *allocate_instance(struct device *dev, const struct musb_hdrc_config *config, void __iomem *mbase) { struct musb *musb; struct musb_hw_ep *ep; int epnum; int ret; musb = devm_kzalloc(dev, sizeof(*musb), GFP_KERNEL); if (!musb) return NULL; INIT_LIST_HEAD(&musb->control); INIT_LIST_HEAD(&musb->in_bulk); INIT_LIST_HEAD(&musb->out_bulk); INIT_LIST_HEAD(&musb->pending_list); musb->vbuserr_retry = VBUSERR_RETRY_COUNT; musb->a_wait_bcon = OTG_TIME_A_WAIT_BCON; musb->mregs = mbase; musb->ctrl_base = mbase; musb->nIrq = -ENODEV; musb->config = config; BUG_ON(musb->config->num_eps > MUSB_C_NUM_EPS); for (epnum = 0, ep = musb->endpoints; epnum < musb->config->num_eps; epnum++, ep++) { ep->musb = musb; ep->epnum = epnum; } musb->controller = dev; ret = musb_host_alloc(musb); if (ret < 0) goto err_free; dev_set_drvdata(dev, musb); return musb; err_free: return NULL; } static void musb_free(struct musb *musb) { /* this has multiple entry modes. it handles fault cleanup after * probe(), where things may be partially set up, as well as rmmod * cleanup after everything's been de-activated. */ if (musb->nIrq >= 0) { if (musb->irq_wake) disable_irq_wake(musb->nIrq); free_irq(musb->nIrq, musb); } musb_host_free(musb); } struct musb_pending_work { int (*callback)(struct musb *musb, void *data); void *data; struct list_head node; }; #ifdef CONFIG_PM /* * Called from musb_runtime_resume(), musb_resume(), and * musb_queue_resume_work(). Callers must take musb->lock. */ static int musb_run_resume_work(struct musb *musb) { struct musb_pending_work *w, *_w; unsigned long flags; int error = 0; spin_lock_irqsave(&musb->list_lock, flags); list_for_each_entry_safe(w, _w, &musb->pending_list, node) { if (w->callback) { error = w->callback(musb, w->data); if (error < 0) { dev_err(musb->controller, "resume callback %p failed: %i\n", w->callback, error); } } list_del(&w->node); devm_kfree(musb->controller, w); } spin_unlock_irqrestore(&musb->list_lock, flags); return error; } #endif /* * Called to run work if device is active or else queue the work to happen * on resume. Caller must take musb->lock and must hold an RPM reference. * * Note that we cowardly refuse queuing work after musb PM runtime * resume is done calling musb_run_resume_work() and return -EINPROGRESS * instead. */ int musb_queue_resume_work(struct musb *musb, int (*callback)(struct musb *musb, void *data), void *data) { struct musb_pending_work *w; unsigned long flags; bool is_suspended; int error; if (WARN_ON(!callback)) return -EINVAL; spin_lock_irqsave(&musb->list_lock, flags); is_suspended = musb->is_runtime_suspended; if (is_suspended) { w = devm_kzalloc(musb->controller, sizeof(*w), GFP_ATOMIC); if (!w) { error = -ENOMEM; goto out_unlock; } w->callback = callback; w->data = data; list_add_tail(&w->node, &musb->pending_list); error = 0; } out_unlock: spin_unlock_irqrestore(&musb->list_lock, flags); if (!is_suspended) error = callback(musb, data); return error; } EXPORT_SYMBOL_GPL(musb_queue_resume_work); static void musb_deassert_reset(struct work_struct *work) { struct musb *musb; unsigned long flags; musb = container_of(work, struct musb, deassert_reset_work.work); spin_lock_irqsave(&musb->lock, flags); if (musb->port1_status & USB_PORT_STAT_RESET) musb_port_reset(musb, false); spin_unlock_irqrestore(&musb->lock, flags); } /* * Perform generic per-controller initialization. * * @dev: the controller (already clocked, etc) * @nIrq: IRQ number * @ctrl: virtual address of controller registers, * not yet corrected for platform-specific offsets */ static int musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl) { int status; struct musb *musb; struct musb_hdrc_platform_data *plat = dev_get_platdata(dev); /* The driver might handle more features than the board; OK. * Fail when the board needs a feature that's not enabled. */ if (!plat) { dev_err(dev, "no platform_data?\n"); status = -ENODEV; goto fail0; } /* allocate */ musb = allocate_instance(dev, plat->config, ctrl); if (!musb) { status = -ENOMEM; goto fail0; } spin_lock_init(&musb->lock); spin_lock_init(&musb->list_lock); musb->min_power = plat->min_power; musb->ops = plat->platform_ops; musb->port_mode = plat->mode; /* * Initialize the default IO functions. At least omap2430 needs * these early. We initialize the platform specific IO functions * later on. */ musb_readb = musb_default_readb; musb_writeb = musb_default_writeb; musb_readw = musb_default_readw; musb_writew = musb_default_writew; /* The musb_platform_init() call: * - adjusts musb->mregs * - sets the musb->isr * - may initialize an integrated transceiver * - initializes musb->xceiv, usually by otg_get_phy() * - stops powering VBUS * * There are various transceiver configurations. * DaVinci, TUSB60x0, and others integrate them. OMAP3 uses * external/discrete ones in various flavors (twl4030 family, * isp1504, non-OTG, etc) mostly hooking up through ULPI. */ status = musb_platform_init(musb); if (status < 0) goto fail1; if (!musb->isr) { status = -ENODEV; goto fail2; } /* Most devices use indexed offset or flat offset */ if (musb->ops->quirks & MUSB_INDEXED_EP) { musb->io.ep_offset = musb_indexed_ep_offset; musb->io.ep_select = musb_indexed_ep_select; } else { musb->io.ep_offset = musb_flat_ep_offset; musb->io.ep_select = musb_flat_ep_select; } if (musb->ops->quirks & MUSB_G_NO_SKB_RESERVE) musb->g.quirk_avoids_skb_reserve = 1; /* At least tusb6010 has its own offsets */ if (musb->ops->ep_offset) musb->io.ep_offset = musb->ops->ep_offset; if (musb->ops->ep_select) musb->io.ep_select = musb->ops->ep_select; if (musb->ops->fifo_mode) fifo_mode = musb->ops->fifo_mode; else fifo_mode = 4; if (musb->ops->fifo_offset) musb->io.fifo_offset = musb->ops->fifo_offset; else musb->io.fifo_offset = musb_default_fifo_offset; if (musb->ops->busctl_offset) musb->io.busctl_offset = musb->ops->busctl_offset; else musb->io.busctl_offset = musb_default_busctl_offset; if (musb->ops->readb) musb_readb = musb->ops->readb; if (musb->ops->writeb) musb_writeb = musb->ops->writeb; if (musb->ops->clearb) musb_clearb = musb->ops->clearb; else musb_clearb = musb_readb; if (musb->ops->readw) musb_readw = musb->ops->readw; if (musb->ops->writew) musb_writew = musb->ops->writew; if (musb->ops->clearw) musb_clearw = musb->ops->clearw; else musb_clearw = musb_readw; #ifndef CONFIG_MUSB_PIO_ONLY if (!musb->ops->dma_init || !musb->ops->dma_exit) { dev_err(dev, "DMA controller not set\n"); status = -ENODEV; goto fail2; } musb_dma_controller_create = musb->ops->dma_init; musb_dma_controller_destroy = musb->ops->dma_exit; #endif if (musb->ops->read_fifo) musb->io.read_fifo = musb->ops->read_fifo; else musb->io.read_fifo = musb_default_read_fifo; if (musb->ops->write_fifo) musb->io.write_fifo = musb->ops->write_fifo; else musb->io.write_fifo = musb_default_write_fifo; if (musb->ops->get_toggle) musb->io.get_toggle = musb->ops->get_toggle; else musb->io.get_toggle = musb_default_get_toggle; if (musb->ops->set_toggle) musb->io.set_toggle = musb->ops->set_toggle; else musb->io.set_toggle = musb_default_set_toggle; if (IS_ENABLED(CONFIG_USB_PHY) && musb->xceiv && !musb->xceiv->io_ops) { musb->xceiv->io_dev = musb->controller; musb->xceiv->io_priv = musb->mregs; musb->xceiv->io_ops = &musb_ulpi_access; } if (musb->ops->phy_callback) musb_phy_callback = musb->ops->phy_callback; /* * We need musb_read/write functions initialized for PM. * Note that at least 2430 glue needs autosuspend delay * somewhere above 300 ms for the hardware to idle properly * after disconnecting the cable in host mode. Let's use * 500 ms for some margin. */ pm_runtime_use_autosuspend(musb->controller); pm_runtime_set_autosuspend_delay(musb->controller, 500); pm_runtime_enable(musb->controller); pm_runtime_get_sync(musb->controller); status = usb_phy_init(musb->xceiv); if (status < 0) goto err_usb_phy_init; if (use_dma && dev->dma_mask) { musb->dma_controller = musb_dma_controller_create(musb, musb->mregs); if (IS_ERR(musb->dma_controller)) { status = PTR_ERR(musb->dma_controller); goto fail2_5; } } /* be sure interrupts are disabled before connecting ISR */ musb_platform_disable(musb); musb_disable_interrupts(musb); musb_writeb(musb->mregs, MUSB_DEVCTL, 0); /* MUSB_POWER_SOFTCONN might be already set, JZ4740 does this. */ musb_writeb(musb->mregs, MUSB_POWER, 0); /* Init IRQ workqueue before request_irq */ INIT_DELAYED_WORK(&musb->irq_work, musb_irq_work); INIT_DELAYED_WORK(&musb->deassert_reset_work, musb_deassert_reset); INIT_DELAYED_WORK(&musb->finish_resume_work, musb_host_finish_resume); /* setup musb parts of the core (especially endpoints) */ status = musb_core_init(plat->config->multipoint ? MUSB_CONTROLLER_MHDRC : MUSB_CONTROLLER_HDRC, musb); if (status < 0) goto fail3; timer_setup(&musb->otg_timer, musb_otg_timer_func, 0); /* attach to the IRQ */ if (request_irq(nIrq, musb->isr, IRQF_SHARED, dev_name(dev), musb)) { dev_err(dev, "request_irq %d failed!\n", nIrq); status = -ENODEV; goto fail3; } musb->nIrq = nIrq; /* FIXME this handles wakeup irqs wrong */ if (enable_irq_wake(nIrq) == 0) { musb->irq_wake = 1; device_init_wakeup(dev, 1); } else { musb->irq_wake = 0; } /* program PHY to use external vBus if required */ if (plat->extvbus) { u8 busctl = musb_readb(musb->mregs, MUSB_ULPI_BUSCONTROL); busctl |= MUSB_ULPI_USE_EXTVBUS; musb_writeb(musb->mregs, MUSB_ULPI_BUSCONTROL, busctl); } MUSB_DEV_MODE(musb); musb_set_state(musb, OTG_STATE_B_IDLE); switch (musb->port_mode) { case MUSB_HOST: status = musb_host_setup(musb, plat->power); if (status < 0) goto fail3; status = musb_platform_set_mode(musb, MUSB_HOST); break; case MUSB_PERIPHERAL: status = musb_gadget_setup(musb); if (status < 0) goto fail3; status = musb_platform_set_mode(musb, MUSB_PERIPHERAL); break; case MUSB_OTG: status = musb_host_setup(musb, plat->power); if (status < 0) goto fail3; status = musb_gadget_setup(musb); if (status) { musb_host_cleanup(musb); goto fail3; } status = musb_platform_set_mode(musb, MUSB_OTG); break; default: dev_err(dev, "unsupported port mode %d\n", musb->port_mode); break; } if (status < 0) goto fail3; musb_init_debugfs(musb); musb->is_initialized = 1; pm_runtime_mark_last_busy(musb->controller); pm_runtime_put_autosuspend(musb->controller); return 0; fail3: cancel_delayed_work_sync(&musb->irq_work); cancel_delayed_work_sync(&musb->finish_resume_work); cancel_delayed_work_sync(&musb->deassert_reset_work); if (musb->dma_controller) musb_dma_controller_destroy(musb->dma_controller); fail2_5: usb_phy_shutdown(musb->xceiv); err_usb_phy_init: pm_runtime_dont_use_autosuspend(musb->controller); pm_runtime_put_sync(musb->controller); pm_runtime_disable(musb->controller); fail2: if (musb->irq_wake) device_init_wakeup(dev, 0); musb_platform_exit(musb); fail1: dev_err_probe(musb->controller, status, "%s failed\n", __func__); musb_free(musb); fail0: return status; } /*-------------------------------------------------------------------------*/ /* all implementations (PCI bridge to FPGA, VLYNQ, etc) should just * bridge to a platform device; this driver then suffices. */ static int musb_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; int irq = platform_get_irq_byname(pdev, "mc"); void __iomem *base; if (irq <= 0) return -ENODEV; base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(base)) return PTR_ERR(base); return musb_init_controller(dev, irq, base); } static void musb_remove(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct musb *musb = dev_to_musb(dev); unsigned long flags; /* this gets called on rmmod. * - Host mode: host may still be active * - Peripheral mode: peripheral is deactivated (or never-activated) * - OTG mode: both roles are deactivated (or never-activated) */ musb_exit_debugfs(musb); cancel_delayed_work_sync(&musb->irq_work); cancel_delayed_work_sync(&musb->finish_resume_work); cancel_delayed_work_sync(&musb->deassert_reset_work); pm_runtime_get_sync(musb->controller); musb_host_cleanup(musb); musb_gadget_cleanup(musb); musb_platform_disable(musb); spin_lock_irqsave(&musb->lock, flags); musb_disable_interrupts(musb); musb_writeb(musb->mregs, MUSB_DEVCTL, 0); spin_unlock_irqrestore(&musb->lock, flags); musb_platform_exit(musb); pm_runtime_dont_use_autosuspend(musb->controller); pm_runtime_put_sync(musb->controller); pm_runtime_disable(musb->controller); musb_phy_callback = NULL; if (musb->dma_controller) musb_dma_controller_destroy(musb->dma_controller); usb_phy_shutdown(musb->xceiv); musb_free(musb); device_init_wakeup(dev, 0); } #ifdef CONFIG_PM static void musb_save_context(struct musb *musb) { int i; void __iomem *musb_base = musb->mregs; void __iomem *epio; musb->context.frame = musb_readw(musb_base, MUSB_FRAME); musb->context.testmode = musb_readb(musb_base, MUSB_TESTMODE); musb->context.busctl = musb_readb(musb_base, MUSB_ULPI_BUSCONTROL); musb->context.power = musb_readb(musb_base, MUSB_POWER); musb->context.intrusbe = musb_readb(musb_base, MUSB_INTRUSBE); musb->context.index = musb_readb(musb_base, MUSB_INDEX); musb->context.devctl = musb_readb(musb_base, MUSB_DEVCTL); for (i = 0; i < musb->config->num_eps; ++i) { epio = musb->endpoints[i].regs; if (!epio) continue; musb_writeb(musb_base, MUSB_INDEX, i); musb->context.index_regs[i].txmaxp = musb_readw(epio, MUSB_TXMAXP); musb->context.index_regs[i].txcsr = musb_readw(epio, MUSB_TXCSR); musb->context.index_regs[i].rxmaxp = musb_readw(epio, MUSB_RXMAXP); musb->context.index_regs[i].rxcsr = musb_readw(epio, MUSB_RXCSR); if (musb->dyn_fifo) { musb->context.index_regs[i].txfifoadd = musb_readw(musb_base, MUSB_TXFIFOADD); musb->context.index_regs[i].rxfifoadd = musb_readw(musb_base, MUSB_RXFIFOADD); musb->context.index_regs[i].txfifosz = musb_readb(musb_base, MUSB_TXFIFOSZ); musb->context.index_regs[i].rxfifosz = musb_readb(musb_base, MUSB_RXFIFOSZ); } musb->context.index_regs[i].txtype = musb_readb(epio, MUSB_TXTYPE); musb->context.index_regs[i].txinterval = musb_readb(epio, MUSB_TXINTERVAL); musb->context.index_regs[i].rxtype = musb_readb(epio, MUSB_RXTYPE); musb->context.index_regs[i].rxinterval = musb_readb(epio, MUSB_RXINTERVAL); musb->context.index_regs[i].txfunaddr = musb_read_txfunaddr(musb, i); musb->context.index_regs[i].txhubaddr = musb_read_txhubaddr(musb, i); musb->context.index_regs[i].txhubport = musb_read_txhubport(musb, i); musb->context.index_regs[i].rxfunaddr = musb_read_rxfunaddr(musb, i); musb->context.index_regs[i].rxhubaddr = musb_read_rxhubaddr(musb, i); musb->context.index_regs[i].rxhubport = musb_read_rxhubport(musb, i); } } static void musb_restore_context(struct musb *musb) { int i; void __iomem *musb_base = musb->mregs; void __iomem *epio; u8 power; musb_writew(musb_base, MUSB_FRAME, musb->context.frame); musb_writeb(musb_base, MUSB_TESTMODE, musb->context.testmode); musb_writeb(musb_base, MUSB_ULPI_BUSCONTROL, musb->context.busctl); /* Don't affect SUSPENDM/RESUME bits in POWER reg */ power = musb_readb(musb_base, MUSB_POWER); power &= MUSB_POWER_SUSPENDM | MUSB_POWER_RESUME; musb->context.power &= ~(MUSB_POWER_SUSPENDM | MUSB_POWER_RESUME); power |= musb->context.power; musb_writeb(musb_base, MUSB_POWER, power); musb_writew(musb_base, MUSB_INTRTXE, musb->intrtxe); musb_writew(musb_base, MUSB_INTRRXE, musb->intrrxe); musb_writeb(musb_base, MUSB_INTRUSBE, musb->context.intrusbe); if (musb->context.devctl & MUSB_DEVCTL_SESSION) musb_writeb(musb_base, MUSB_DEVCTL, musb->context.devctl); for (i = 0; i < musb->config->num_eps; ++i) { epio = musb->endpoints[i].regs; if (!epio) continue; musb_writeb(musb_base, MUSB_INDEX, i); musb_writew(epio, MUSB_TXMAXP, musb->context.index_regs[i].txmaxp); musb_writew(epio, MUSB_TXCSR, musb->context.index_regs[i].txcsr); musb_writew(epio, MUSB_RXMAXP, musb->context.index_regs[i].rxmaxp); musb_writew(epio, MUSB_RXCSR, musb->context.index_regs[i].rxcsr); if (musb->dyn_fifo) { musb_writeb(musb_base, MUSB_TXFIFOSZ, musb->context.index_regs[i].txfifosz); musb_writeb(musb_base, MUSB_RXFIFOSZ, musb->context.index_regs[i].rxfifosz); musb_writew(musb_base, MUSB_TXFIFOADD, musb->context.index_regs[i].txfifoadd); musb_writew(musb_base, MUSB_RXFIFOADD, musb->context.index_regs[i].rxfifoadd); } musb_writeb(epio, MUSB_TXTYPE, musb->context.index_regs[i].txtype); musb_writeb(epio, MUSB_TXINTERVAL, musb->context.index_regs[i].txinterval); musb_writeb(epio, MUSB_RXTYPE, musb->context.index_regs[i].rxtype); musb_writeb(epio, MUSB_RXINTERVAL, musb->context.index_regs[i].rxinterval); musb_write_txfunaddr(musb, i, musb->context.index_regs[i].txfunaddr); musb_write_txhubaddr(musb, i, musb->context.index_regs[i].txhubaddr); musb_write_txhubport(musb, i, musb->context.index_regs[i].txhubport); musb_write_rxfunaddr(musb, i, musb->context.index_regs[i].rxfunaddr); musb_write_rxhubaddr(musb, i, musb->context.index_regs[i].rxhubaddr); musb_write_rxhubport(musb, i, musb->context.index_regs[i].rxhubport); } musb_writeb(musb_base, MUSB_INDEX, musb->context.index); } static int musb_suspend(struct device *dev) { struct musb *musb = dev_to_musb(dev); unsigned long flags; int ret; ret = pm_runtime_get_sync(dev); if (ret < 0) { pm_runtime_put_noidle(dev); return ret; } musb_platform_disable(musb); musb_disable_interrupts(musb); musb->flush_irq_work = true; while (flush_delayed_work(&musb->irq_work)) ; musb->flush_irq_work = false; if (!(musb->ops->quirks & MUSB_PRESERVE_SESSION)) musb_writeb(musb->mregs, MUSB_DEVCTL, 0); WARN_ON(!list_empty(&musb->pending_list)); spin_lock_irqsave(&musb->lock, flags); if (is_peripheral_active(musb)) { /* FIXME force disconnect unless we know USB will wake * the system up quickly enough to respond ... */ } else if (is_host_active(musb)) { /* we know all the children are suspended; sometimes * they will even be wakeup-enabled. */ } musb_save_context(musb); spin_unlock_irqrestore(&musb->lock, flags); return 0; } static int musb_resume(struct device *dev) { struct musb *musb = dev_to_musb(dev); unsigned long flags; int error; u8 devctl; u8 mask; /* * For static cmos like DaVinci, register values were preserved * unless for some reason the whole soc powered down or the USB * module got reset through the PSC (vs just being disabled). * * For the DSPS glue layer though, a full register restore has to * be done. As it shouldn't harm other platforms, we do it * unconditionally. */ musb_restore_context(musb); devctl = musb_readb(musb->mregs, MUSB_DEVCTL); mask = MUSB_DEVCTL_BDEVICE | MUSB_DEVCTL_FSDEV | MUSB_DEVCTL_LSDEV; if ((devctl & mask) != (musb->context.devctl & mask)) musb->port1_status = 0; musb_enable_interrupts(musb); musb_platform_enable(musb); /* session might be disabled in suspend */ if (musb->port_mode == MUSB_HOST && !(musb->ops->quirks & MUSB_PRESERVE_SESSION)) { devctl |= MUSB_DEVCTL_SESSION; musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); } spin_lock_irqsave(&musb->lock, flags); error = musb_run_resume_work(musb); if (error) dev_err(musb->controller, "resume work failed with %i\n", error); spin_unlock_irqrestore(&musb->lock, flags); pm_runtime_mark_last_busy(dev); pm_runtime_put_autosuspend(dev); return 0; } static int musb_runtime_suspend(struct device *dev) { struct musb *musb = dev_to_musb(dev); musb_save_context(musb); musb->is_runtime_suspended = 1; return 0; } static int musb_runtime_resume(struct device *dev) { struct musb *musb = dev_to_musb(dev); unsigned long flags; int error; /* * When pm_runtime_get_sync called for the first time in driver * init, some of the structure is still not initialized which is * used in restore function. But clock needs to be * enabled before any register access, so * pm_runtime_get_sync has to be called. * Also context restore without save does not make * any sense */ if (!musb->is_initialized) return 0; musb_restore_context(musb); spin_lock_irqsave(&musb->lock, flags); error = musb_run_resume_work(musb); if (error) dev_err(musb->controller, "resume work failed with %i\n", error); musb->is_runtime_suspended = 0; spin_unlock_irqrestore(&musb->lock, flags); return 0; } static const struct dev_pm_ops musb_dev_pm_ops = { .suspend = musb_suspend, .resume = musb_resume, .runtime_suspend = musb_runtime_suspend, .runtime_resume = musb_runtime_resume, }; #define MUSB_DEV_PM_OPS (&musb_dev_pm_ops) #else #define MUSB_DEV_PM_OPS NULL #endif static struct platform_driver musb_driver = { .driver = { .name = musb_driver_name, .bus = &platform_bus_type, .pm = MUSB_DEV_PM_OPS, .dev_groups = musb_groups, }, .probe = musb_probe, .remove_new = musb_remove, }; module_platform_driver(musb_driver);
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