| /* |
| * Copyright (c) 2000-2004 by David Brownell |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the |
| * Free Software Foundation; either version 2 of the License, or (at your |
| * option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software Foundation, |
| * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| */ |
| |
| #include <linux/config.h> |
| |
| #ifdef CONFIG_USB_DEBUG |
| #define DEBUG |
| #else |
| #undef DEBUG |
| #endif |
| |
| #include <linux/module.h> |
| #include <linux/pci.h> |
| #include <linux/dmapool.h> |
| #include <linux/kernel.h> |
| #include <linux/delay.h> |
| #include <linux/ioport.h> |
| #include <linux/sched.h> |
| #include <linux/slab.h> |
| #include <linux/smp_lock.h> |
| #include <linux/errno.h> |
| #include <linux/init.h> |
| #include <linux/timer.h> |
| #include <linux/list.h> |
| #include <linux/interrupt.h> |
| #include <linux/reboot.h> |
| #include <linux/usb.h> |
| #include <linux/moduleparam.h> |
| #include <linux/dma-mapping.h> |
| |
| #include "../core/hcd.h" |
| |
| #include <asm/byteorder.h> |
| #include <asm/io.h> |
| #include <asm/irq.h> |
| #include <asm/system.h> |
| #include <asm/unaligned.h> |
| |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| /* |
| * EHCI hc_driver implementation ... experimental, incomplete. |
| * Based on the final 1.0 register interface specification. |
| * |
| * USB 2.0 shows up in upcoming www.pcmcia.org technology. |
| * First was PCMCIA, like ISA; then CardBus, which is PCI. |
| * Next comes "CardBay", using USB 2.0 signals. |
| * |
| * Contains additional contributions by Brad Hards, Rory Bolt, and others. |
| * Special thanks to Intel and VIA for providing host controllers to |
| * test this driver on, and Cypress (including In-System Design) for |
| * providing early devices for those host controllers to talk to! |
| * |
| * HISTORY: |
| * |
| * 2004-05-10 Root hub and PCI suspend/resume support; remote wakeup. (db) |
| * 2004-02-24 Replace pci_* with generic dma_* API calls (dsaxena@plexity.net) |
| * 2003-12-29 Rewritten high speed iso transfer support (by Michal Sojka, |
| * <sojkam@centrum.cz>, updates by DB). |
| * |
| * 2002-11-29 Correct handling for hw async_next register. |
| * 2002-08-06 Handling for bulk and interrupt transfers is mostly shared; |
| * only scheduling is different, no arbitrary limitations. |
| * 2002-07-25 Sanity check PCI reads, mostly for better cardbus support, |
| * clean up HC run state handshaking. |
| * 2002-05-24 Preliminary FS/LS interrupts, using scheduling shortcuts |
| * 2002-05-11 Clear TT errors for FS/LS ctrl/bulk. Fill in some other |
| * missing pieces: enabling 64bit dma, handoff from BIOS/SMM. |
| * 2002-05-07 Some error path cleanups to report better errors; wmb(); |
| * use non-CVS version id; better iso bandwidth claim. |
| * 2002-04-19 Control/bulk/interrupt submit no longer uses giveback() on |
| * errors in submit path. Bugfixes to interrupt scheduling/processing. |
| * 2002-03-05 Initial high-speed ISO support; reduce ITD memory; shift |
| * more checking to generic hcd framework (db). Make it work with |
| * Philips EHCI; reduce PCI traffic; shorten IRQ path (Rory Bolt). |
| * 2002-01-14 Minor cleanup; version synch. |
| * 2002-01-08 Fix roothub handoff of FS/LS to companion controllers. |
| * 2002-01-04 Control/Bulk queuing behaves. |
| * |
| * 2001-12-12 Initial patch version for Linux 2.5.1 kernel. |
| * 2001-June Works with usb-storage and NEC EHCI on 2.4 |
| */ |
| |
| #define DRIVER_VERSION "10 Dec 2004" |
| #define DRIVER_AUTHOR "David Brownell" |
| #define DRIVER_DESC "USB 2.0 'Enhanced' Host Controller (EHCI) Driver" |
| |
| static const char hcd_name [] = "ehci_hcd"; |
| |
| |
| #undef EHCI_VERBOSE_DEBUG |
| #undef EHCI_URB_TRACE |
| |
| #ifdef DEBUG |
| #define EHCI_STATS |
| #endif |
| |
| /* magic numbers that can affect system performance */ |
| #define EHCI_TUNE_CERR 3 /* 0-3 qtd retries; 0 == don't stop */ |
| #define EHCI_TUNE_RL_HS 4 /* nak throttle; see 4.9 */ |
| #define EHCI_TUNE_RL_TT 0 |
| #define EHCI_TUNE_MULT_HS 1 /* 1-3 transactions/uframe; 4.10.3 */ |
| #define EHCI_TUNE_MULT_TT 1 |
| #define EHCI_TUNE_FLS 2 /* (small) 256 frame schedule */ |
| |
| #define EHCI_IAA_JIFFIES (HZ/100) /* arbitrary; ~10 msec */ |
| #define EHCI_IO_JIFFIES (HZ/10) /* io watchdog > irq_thresh */ |
| #define EHCI_ASYNC_JIFFIES (HZ/20) /* async idle timeout */ |
| #define EHCI_SHRINK_JIFFIES (HZ/200) /* async qh unlink delay */ |
| |
| /* Initial IRQ latency: faster than hw default */ |
| static int log2_irq_thresh = 0; // 0 to 6 |
| module_param (log2_irq_thresh, int, S_IRUGO); |
| MODULE_PARM_DESC (log2_irq_thresh, "log2 IRQ latency, 1-64 microframes"); |
| |
| /* initial park setting: slower than hw default */ |
| static unsigned park = 0; |
| module_param (park, uint, S_IRUGO); |
| MODULE_PARM_DESC (park, "park setting; 1-3 back-to-back async packets"); |
| |
| #define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT) |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| #include "ehci.h" |
| #include "ehci-dbg.c" |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| /* |
| * handshake - spin reading hc until handshake completes or fails |
| * @ptr: address of hc register to be read |
| * @mask: bits to look at in result of read |
| * @done: value of those bits when handshake succeeds |
| * @usec: timeout in microseconds |
| * |
| * Returns negative errno, or zero on success |
| * |
| * Success happens when the "mask" bits have the specified value (hardware |
| * handshake done). There are two failure modes: "usec" have passed (major |
| * hardware flakeout), or the register reads as all-ones (hardware removed). |
| * |
| * That last failure should_only happen in cases like physical cardbus eject |
| * before driver shutdown. But it also seems to be caused by bugs in cardbus |
| * bridge shutdown: shutting down the bridge before the devices using it. |
| */ |
| static int handshake (void __iomem *ptr, u32 mask, u32 done, int usec) |
| { |
| u32 result; |
| |
| do { |
| result = readl (ptr); |
| if (result == ~(u32)0) /* card removed */ |
| return -ENODEV; |
| result &= mask; |
| if (result == done) |
| return 0; |
| udelay (1); |
| usec--; |
| } while (usec > 0); |
| return -ETIMEDOUT; |
| } |
| |
| /* force HC to halt state from unknown (EHCI spec section 2.3) */ |
| static int ehci_halt (struct ehci_hcd *ehci) |
| { |
| u32 temp = readl (&ehci->regs->status); |
| |
| if ((temp & STS_HALT) != 0) |
| return 0; |
| |
| temp = readl (&ehci->regs->command); |
| temp &= ~CMD_RUN; |
| writel (temp, &ehci->regs->command); |
| return handshake (&ehci->regs->status, STS_HALT, STS_HALT, 16 * 125); |
| } |
| |
| /* put TDI/ARC silicon into EHCI mode */ |
| static void tdi_reset (struct ehci_hcd *ehci) |
| { |
| u32 __iomem *reg_ptr; |
| u32 tmp; |
| |
| reg_ptr = (u32 __iomem *)(((u8 __iomem *)ehci->regs) + 0x68); |
| tmp = readl (reg_ptr); |
| tmp |= 0x3; |
| writel (tmp, reg_ptr); |
| } |
| |
| /* reset a non-running (STS_HALT == 1) controller */ |
| static int ehci_reset (struct ehci_hcd *ehci) |
| { |
| int retval; |
| u32 command = readl (&ehci->regs->command); |
| |
| command |= CMD_RESET; |
| dbg_cmd (ehci, "reset", command); |
| writel (command, &ehci->regs->command); |
| ehci_to_hcd(ehci)->state = HC_STATE_HALT; |
| ehci->next_statechange = jiffies; |
| retval = handshake (&ehci->regs->command, CMD_RESET, 0, 250 * 1000); |
| |
| if (retval) |
| return retval; |
| |
| if (ehci_is_TDI(ehci)) |
| tdi_reset (ehci); |
| |
| return retval; |
| } |
| |
| /* idle the controller (from running) */ |
| static void ehci_quiesce (struct ehci_hcd *ehci) |
| { |
| u32 temp; |
| |
| #ifdef DEBUG |
| if (!HC_IS_RUNNING (ehci_to_hcd(ehci)->state)) |
| BUG (); |
| #endif |
| |
| /* wait for any schedule enables/disables to take effect */ |
| temp = readl (&ehci->regs->command) << 10; |
| temp &= STS_ASS | STS_PSS; |
| if (handshake (&ehci->regs->status, STS_ASS | STS_PSS, |
| temp, 16 * 125) != 0) { |
| ehci_to_hcd(ehci)->state = HC_STATE_HALT; |
| return; |
| } |
| |
| /* then disable anything that's still active */ |
| temp = readl (&ehci->regs->command); |
| temp &= ~(CMD_ASE | CMD_IAAD | CMD_PSE); |
| writel (temp, &ehci->regs->command); |
| |
| /* hardware can take 16 microframes to turn off ... */ |
| if (handshake (&ehci->regs->status, STS_ASS | STS_PSS, |
| 0, 16 * 125) != 0) { |
| ehci_to_hcd(ehci)->state = HC_STATE_HALT; |
| return; |
| } |
| } |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static void ehci_work(struct ehci_hcd *ehci, struct pt_regs *regs); |
| |
| #include "ehci-hub.c" |
| #include "ehci-mem.c" |
| #include "ehci-q.c" |
| #include "ehci-sched.c" |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static void ehci_watchdog (unsigned long param) |
| { |
| struct ehci_hcd *ehci = (struct ehci_hcd *) param; |
| unsigned long flags; |
| |
| spin_lock_irqsave (&ehci->lock, flags); |
| |
| /* lost IAA irqs wedge things badly; seen with a vt8235 */ |
| if (ehci->reclaim) { |
| u32 status = readl (&ehci->regs->status); |
| |
| if (status & STS_IAA) { |
| ehci_vdbg (ehci, "lost IAA\n"); |
| COUNT (ehci->stats.lost_iaa); |
| writel (STS_IAA, &ehci->regs->status); |
| ehci->reclaim_ready = 1; |
| } |
| } |
| |
| /* stop async processing after it's idled a bit */ |
| if (test_bit (TIMER_ASYNC_OFF, &ehci->actions)) |
| start_unlink_async (ehci, ehci->async); |
| |
| /* ehci could run by timer, without IRQs ... */ |
| ehci_work (ehci, NULL); |
| |
| spin_unlock_irqrestore (&ehci->lock, flags); |
| } |
| |
| #ifdef CONFIG_PCI |
| |
| /* EHCI 0.96 (and later) section 5.1 says how to kick BIOS/SMM/... |
| * off the controller (maybe it can boot from highspeed USB disks). |
| */ |
| static int bios_handoff (struct ehci_hcd *ehci, int where, u32 cap) |
| { |
| struct pci_dev *pdev = to_pci_dev(ehci_to_hcd(ehci)->self.controller); |
| |
| /* always say Linux will own the hardware */ |
| pci_write_config_byte(pdev, where + 3, 1); |
| |
| /* maybe wait a while for BIOS to respond */ |
| if (cap & (1 << 16)) { |
| int msec = 5000; |
| |
| do { |
| msleep(10); |
| msec -= 10; |
| pci_read_config_dword(pdev, where, &cap); |
| } while ((cap & (1 << 16)) && msec); |
| if (cap & (1 << 16)) { |
| ehci_err(ehci, "BIOS handoff failed (%d, %08x)\n", |
| where, cap); |
| // some BIOS versions seem buggy... |
| // return 1; |
| ehci_warn (ehci, "continuing after BIOS bug...\n"); |
| /* disable all SMIs, and clear "BIOS owns" flag */ |
| pci_write_config_dword(pdev, where + 4, 0); |
| pci_write_config_byte(pdev, where + 2, 0); |
| } else |
| ehci_dbg(ehci, "BIOS handoff succeeded\n"); |
| } |
| return 0; |
| } |
| |
| #endif |
| |
| static int |
| ehci_reboot (struct notifier_block *self, unsigned long code, void *null) |
| { |
| struct ehci_hcd *ehci; |
| |
| ehci = container_of (self, struct ehci_hcd, reboot_notifier); |
| |
| /* make BIOS/etc use companion controller during reboot */ |
| writel (0, &ehci->regs->configured_flag); |
| return 0; |
| } |
| |
| static void ehci_port_power (struct ehci_hcd *ehci, int is_on) |
| { |
| unsigned port; |
| |
| if (!HCS_PPC (ehci->hcs_params)) |
| return; |
| |
| ehci_dbg (ehci, "...power%s ports...\n", is_on ? "up" : "down"); |
| for (port = HCS_N_PORTS (ehci->hcs_params); port > 0; ) |
| (void) ehci_hub_control(ehci_to_hcd(ehci), |
| is_on ? SetPortFeature : ClearPortFeature, |
| USB_PORT_FEAT_POWER, |
| port--, NULL, 0); |
| msleep(20); |
| } |
| |
| |
| /* called by khubd or root hub init threads */ |
| |
| static int ehci_hc_reset (struct usb_hcd *hcd) |
| { |
| struct ehci_hcd *ehci = hcd_to_ehci (hcd); |
| u32 temp; |
| unsigned count = 256/4; |
| |
| spin_lock_init (&ehci->lock); |
| |
| ehci->caps = hcd->regs; |
| ehci->regs = hcd->regs + HC_LENGTH (readl (&ehci->caps->hc_capbase)); |
| dbg_hcs_params (ehci, "reset"); |
| dbg_hcc_params (ehci, "reset"); |
| |
| /* cache this readonly data; minimize chip reads */ |
| ehci->hcs_params = readl (&ehci->caps->hcs_params); |
| |
| #ifdef CONFIG_PCI |
| if (hcd->self.controller->bus == &pci_bus_type) { |
| struct pci_dev *pdev = to_pci_dev(hcd->self.controller); |
| |
| switch (pdev->vendor) { |
| case PCI_VENDOR_ID_TDI: |
| if (pdev->device == PCI_DEVICE_ID_TDI_EHCI) { |
| ehci->is_tdi_rh_tt = 1; |
| tdi_reset (ehci); |
| } |
| break; |
| case PCI_VENDOR_ID_AMD: |
| /* AMD8111 EHCI doesn't work, according to AMD errata */ |
| if (pdev->device == 0x7463) { |
| ehci_info (ehci, "ignoring AMD8111 (errata)\n"); |
| return -EIO; |
| } |
| break; |
| } |
| |
| /* optional debug port, normally in the first BAR */ |
| temp = pci_find_capability (pdev, 0x0a); |
| if (temp) { |
| pci_read_config_dword(pdev, temp, &temp); |
| temp >>= 16; |
| if ((temp & (3 << 13)) == (1 << 13)) { |
| temp &= 0x1fff; |
| ehci->debug = hcd->regs + temp; |
| temp = readl (&ehci->debug->control); |
| ehci_info (ehci, "debug port %d%s\n", |
| HCS_DEBUG_PORT(ehci->hcs_params), |
| (temp & DBGP_ENABLED) |
| ? " IN USE" |
| : ""); |
| if (!(temp & DBGP_ENABLED)) |
| ehci->debug = NULL; |
| } |
| } |
| |
| temp = HCC_EXT_CAPS (readl (&ehci->caps->hcc_params)); |
| } else |
| temp = 0; |
| |
| /* EHCI 0.96 and later may have "extended capabilities" */ |
| while (temp && count--) { |
| u32 cap; |
| |
| pci_read_config_dword (to_pci_dev(hcd->self.controller), |
| temp, &cap); |
| ehci_dbg (ehci, "capability %04x at %02x\n", cap, temp); |
| switch (cap & 0xff) { |
| case 1: /* BIOS/SMM/... handoff */ |
| if (bios_handoff (ehci, temp, cap) != 0) |
| return -EOPNOTSUPP; |
| break; |
| case 0: /* illegal reserved capability */ |
| ehci_warn (ehci, "illegal capability!\n"); |
| cap = 0; |
| /* FALLTHROUGH */ |
| default: /* unknown */ |
| break; |
| } |
| temp = (cap >> 8) & 0xff; |
| } |
| if (!count) { |
| ehci_err (ehci, "bogus capabilities ... PCI problems!\n"); |
| return -EIO; |
| } |
| if (ehci_is_TDI(ehci)) |
| ehci_reset (ehci); |
| #endif |
| |
| ehci_port_power (ehci, 0); |
| |
| /* at least the Genesys GL880S needs fixup here */ |
| temp = HCS_N_CC(ehci->hcs_params) * HCS_N_PCC(ehci->hcs_params); |
| temp &= 0x0f; |
| if (temp && HCS_N_PORTS(ehci->hcs_params) > temp) { |
| ehci_dbg (ehci, "bogus port configuration: " |
| "cc=%d x pcc=%d < ports=%d\n", |
| HCS_N_CC(ehci->hcs_params), |
| HCS_N_PCC(ehci->hcs_params), |
| HCS_N_PORTS(ehci->hcs_params)); |
| |
| #ifdef CONFIG_PCI |
| if (hcd->self.controller->bus == &pci_bus_type) { |
| struct pci_dev *pdev; |
| |
| pdev = to_pci_dev(hcd->self.controller); |
| switch (pdev->vendor) { |
| case 0x17a0: /* GENESYS */ |
| /* GL880S: should be PORTS=2 */ |
| temp |= (ehci->hcs_params & ~0xf); |
| ehci->hcs_params = temp; |
| break; |
| case PCI_VENDOR_ID_NVIDIA: |
| /* NF4: should be PCC=10 */ |
| break; |
| } |
| } |
| #endif |
| } |
| |
| /* force HC to halt state */ |
| return ehci_halt (ehci); |
| } |
| |
| static int ehci_start (struct usb_hcd *hcd) |
| { |
| struct ehci_hcd *ehci = hcd_to_ehci (hcd); |
| u32 temp; |
| int retval; |
| u32 hcc_params; |
| u8 sbrn = 0; |
| int first; |
| |
| /* skip some things on restart paths */ |
| first = (ehci->watchdog.data == 0); |
| if (first) { |
| init_timer (&ehci->watchdog); |
| ehci->watchdog.function = ehci_watchdog; |
| ehci->watchdog.data = (unsigned long) ehci; |
| } |
| |
| /* |
| * hw default: 1K periodic list heads, one per frame. |
| * periodic_size can shrink by USBCMD update if hcc_params allows. |
| */ |
| ehci->periodic_size = DEFAULT_I_TDPS; |
| if (first && (retval = ehci_mem_init (ehci, GFP_KERNEL)) < 0) |
| return retval; |
| |
| /* controllers may cache some of the periodic schedule ... */ |
| hcc_params = readl (&ehci->caps->hcc_params); |
| if (HCC_ISOC_CACHE (hcc_params)) // full frame cache |
| ehci->i_thresh = 8; |
| else // N microframes cached |
| ehci->i_thresh = 2 + HCC_ISOC_THRES (hcc_params); |
| |
| ehci->reclaim = NULL; |
| ehci->reclaim_ready = 0; |
| ehci->next_uframe = -1; |
| |
| /* controller state: unknown --> reset */ |
| |
| /* EHCI spec section 4.1 */ |
| if ((retval = ehci_reset (ehci)) != 0) { |
| ehci_mem_cleanup (ehci); |
| return retval; |
| } |
| writel (ehci->periodic_dma, &ehci->regs->frame_list); |
| |
| #ifdef CONFIG_PCI |
| if (hcd->self.controller->bus == &pci_bus_type) { |
| struct pci_dev *pdev; |
| u16 port_wake; |
| |
| pdev = to_pci_dev(hcd->self.controller); |
| |
| /* Serial Bus Release Number is at PCI 0x60 offset */ |
| pci_read_config_byte(pdev, 0x60, &sbrn); |
| |
| /* port wake capability, reported by boot firmware */ |
| pci_read_config_word(pdev, 0x62, &port_wake); |
| hcd->can_wakeup = (port_wake & 1) != 0; |
| |
| /* help hc dma work well with cachelines */ |
| pci_set_mwi (pdev); |
| } |
| #endif |
| |
| /* |
| * dedicate a qh for the async ring head, since we couldn't unlink |
| * a 'real' qh without stopping the async schedule [4.8]. use it |
| * as the 'reclamation list head' too. |
| * its dummy is used in hw_alt_next of many tds, to prevent the qh |
| * from automatically advancing to the next td after short reads. |
| */ |
| if (first) { |
| ehci->async->qh_next.qh = NULL; |
| ehci->async->hw_next = QH_NEXT (ehci->async->qh_dma); |
| ehci->async->hw_info1 = cpu_to_le32 (QH_HEAD); |
| ehci->async->hw_token = cpu_to_le32 (QTD_STS_HALT); |
| ehci->async->hw_qtd_next = EHCI_LIST_END; |
| ehci->async->qh_state = QH_STATE_LINKED; |
| ehci->async->hw_alt_next = QTD_NEXT (ehci->async->dummy->qtd_dma); |
| } |
| writel ((u32)ehci->async->qh_dma, &ehci->regs->async_next); |
| |
| /* |
| * hcc_params controls whether ehci->regs->segment must (!!!) |
| * be used; it constrains QH/ITD/SITD and QTD locations. |
| * pci_pool consistent memory always uses segment zero. |
| * streaming mappings for I/O buffers, like pci_map_single(), |
| * can return segments above 4GB, if the device allows. |
| * |
| * NOTE: the dma mask is visible through dma_supported(), so |
| * drivers can pass this info along ... like NETIF_F_HIGHDMA, |
| * Scsi_Host.highmem_io, and so forth. It's readonly to all |
| * host side drivers though. |
| */ |
| if (HCC_64BIT_ADDR (hcc_params)) { |
| writel (0, &ehci->regs->segment); |
| #if 0 |
| // this is deeply broken on almost all architectures |
| if (!dma_set_mask (hcd->self.controller, DMA_64BIT_MASK)) |
| ehci_info (ehci, "enabled 64bit DMA\n"); |
| #endif |
| } |
| |
| /* clear interrupt enables, set irq latency */ |
| if (log2_irq_thresh < 0 || log2_irq_thresh > 6) |
| log2_irq_thresh = 0; |
| temp = 1 << (16 + log2_irq_thresh); |
| if (HCC_CANPARK(hcc_params)) { |
| /* HW default park == 3, on hardware that supports it (like |
| * NVidia and ALI silicon), maximizes throughput on the async |
| * schedule by avoiding QH fetches between transfers. |
| * |
| * With fast usb storage devices and NForce2, "park" seems to |
| * make problems: throughput reduction (!), data errors... |
| */ |
| if (park) { |
| park = min (park, (unsigned) 3); |
| temp |= CMD_PARK; |
| temp |= park << 8; |
| } |
| ehci_info (ehci, "park %d\n", park); |
| } |
| if (HCC_PGM_FRAMELISTLEN (hcc_params)) { |
| /* periodic schedule size can be smaller than default */ |
| temp &= ~(3 << 2); |
| temp |= (EHCI_TUNE_FLS << 2); |
| switch (EHCI_TUNE_FLS) { |
| case 0: ehci->periodic_size = 1024; break; |
| case 1: ehci->periodic_size = 512; break; |
| case 2: ehci->periodic_size = 256; break; |
| default: BUG (); |
| } |
| } |
| // Philips, Intel, and maybe others need CMD_RUN before the |
| // root hub will detect new devices (why?); NEC doesn't |
| temp |= CMD_RUN; |
| writel (temp, &ehci->regs->command); |
| dbg_cmd (ehci, "init", temp); |
| |
| /* set async sleep time = 10 us ... ? */ |
| |
| /* |
| * Start, enabling full USB 2.0 functionality ... usb 1.1 devices |
| * are explicitly handed to companion controller(s), so no TT is |
| * involved with the root hub. (Except where one is integrated, |
| * and there's no companion controller unless maybe for USB OTG.) |
| */ |
| if (first) { |
| ehci->reboot_notifier.notifier_call = ehci_reboot; |
| register_reboot_notifier (&ehci->reboot_notifier); |
| } |
| |
| hcd->state = HC_STATE_RUNNING; |
| writel (FLAG_CF, &ehci->regs->configured_flag); |
| readl (&ehci->regs->command); /* unblock posted write */ |
| |
| temp = HC_VERSION(readl (&ehci->caps->hc_capbase)); |
| ehci_info (ehci, |
| "USB %x.%x %s, EHCI %x.%02x, driver %s\n", |
| ((sbrn & 0xf0)>>4), (sbrn & 0x0f), |
| first ? "initialized" : "restarted", |
| temp >> 8, temp & 0xff, DRIVER_VERSION); |
| |
| writel (INTR_MASK, &ehci->regs->intr_enable); /* Turn On Interrupts */ |
| |
| if (first) |
| create_debug_files (ehci); |
| |
| return 0; |
| } |
| |
| /* always called by thread; normally rmmod */ |
| |
| static void ehci_stop (struct usb_hcd *hcd) |
| { |
| struct ehci_hcd *ehci = hcd_to_ehci (hcd); |
| |
| ehci_dbg (ehci, "stop\n"); |
| |
| /* Turn off port power on all root hub ports. */ |
| ehci_port_power (ehci, 0); |
| |
| /* no more interrupts ... */ |
| del_timer_sync (&ehci->watchdog); |
| |
| spin_lock_irq(&ehci->lock); |
| if (HC_IS_RUNNING (hcd->state)) |
| ehci_quiesce (ehci); |
| |
| ehci_reset (ehci); |
| writel (0, &ehci->regs->intr_enable); |
| spin_unlock_irq(&ehci->lock); |
| |
| /* let companion controllers work when we aren't */ |
| writel (0, &ehci->regs->configured_flag); |
| unregister_reboot_notifier (&ehci->reboot_notifier); |
| |
| remove_debug_files (ehci); |
| |
| /* root hub is shut down separately (first, when possible) */ |
| spin_lock_irq (&ehci->lock); |
| if (ehci->async) |
| ehci_work (ehci, NULL); |
| spin_unlock_irq (&ehci->lock); |
| ehci_mem_cleanup (ehci); |
| |
| #ifdef EHCI_STATS |
| ehci_dbg (ehci, "irq normal %ld err %ld reclaim %ld (lost %ld)\n", |
| ehci->stats.normal, ehci->stats.error, ehci->stats.reclaim, |
| ehci->stats.lost_iaa); |
| ehci_dbg (ehci, "complete %ld unlink %ld\n", |
| ehci->stats.complete, ehci->stats.unlink); |
| #endif |
| |
| dbg_status (ehci, "ehci_stop completed", readl (&ehci->regs->status)); |
| } |
| |
| static int ehci_get_frame (struct usb_hcd *hcd) |
| { |
| struct ehci_hcd *ehci = hcd_to_ehci (hcd); |
| return (readl (&ehci->regs->frame_index) >> 3) % ehci->periodic_size; |
| } |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| #ifdef CONFIG_PM |
| |
| /* suspend/resume, section 4.3 */ |
| |
| /* These routines rely on the bus (pci, platform, etc) |
| * to handle powerdown and wakeup, and currently also on |
| * transceivers that don't need any software attention to set up |
| * the right sort of wakeup. |
| */ |
| |
| static int ehci_suspend (struct usb_hcd *hcd, pm_message_t message) |
| { |
| struct ehci_hcd *ehci = hcd_to_ehci (hcd); |
| |
| if (time_before (jiffies, ehci->next_statechange)) |
| msleep (100); |
| |
| #ifdef CONFIG_USB_SUSPEND |
| (void) usb_suspend_device (hcd->self.root_hub, message); |
| #else |
| usb_lock_device (hcd->self.root_hub); |
| (void) ehci_hub_suspend (hcd); |
| usb_unlock_device (hcd->self.root_hub); |
| #endif |
| |
| // save (PCI) FLADJ in case of Vaux power loss |
| // ... we'd only use it to handle clock skew |
| |
| return 0; |
| } |
| |
| static int ehci_resume (struct usb_hcd *hcd) |
| { |
| struct ehci_hcd *ehci = hcd_to_ehci (hcd); |
| unsigned port; |
| struct usb_device *root = hcd->self.root_hub; |
| int retval = -EINVAL; |
| |
| // maybe restore (PCI) FLADJ |
| |
| if (time_before (jiffies, ehci->next_statechange)) |
| msleep (100); |
| |
| /* If any port is suspended, we know we can/must resume the HC. */ |
| for (port = HCS_N_PORTS (ehci->hcs_params); port > 0; ) { |
| u32 status; |
| port--; |
| status = readl (&ehci->regs->port_status [port]); |
| if (status & PORT_SUSPEND) { |
| down (&hcd->self.root_hub->serialize); |
| retval = ehci_hub_resume (hcd); |
| up (&hcd->self.root_hub->serialize); |
| break; |
| } |
| if (!root->children [port]) |
| continue; |
| dbg_port (ehci, __FUNCTION__, port + 1, status); |
| usb_set_device_state (root->children[port], |
| USB_STATE_NOTATTACHED); |
| } |
| |
| /* Else reset, to cope with power loss or flush-to-storage |
| * style "resume" having activated BIOS during reboot. |
| */ |
| if (port == 0) { |
| (void) ehci_halt (ehci); |
| (void) ehci_reset (ehci); |
| (void) ehci_hc_reset (hcd); |
| |
| /* emptying the schedule aborts any urbs */ |
| spin_lock_irq (&ehci->lock); |
| if (ehci->reclaim) |
| ehci->reclaim_ready = 1; |
| ehci_work (ehci, NULL); |
| spin_unlock_irq (&ehci->lock); |
| |
| /* restart; khubd will disconnect devices */ |
| retval = ehci_start (hcd); |
| |
| /* here we "know" root ports should always stay powered; |
| * but some controllers may lose all power. |
| */ |
| ehci_port_power (ehci, 1); |
| } |
| |
| return retval; |
| } |
| |
| #endif |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| /* |
| * ehci_work is called from some interrupts, timers, and so on. |
| * it calls driver completion functions, after dropping ehci->lock. |
| */ |
| static void ehci_work (struct ehci_hcd *ehci, struct pt_regs *regs) |
| { |
| timer_action_done (ehci, TIMER_IO_WATCHDOG); |
| if (ehci->reclaim_ready) |
| end_unlink_async (ehci, regs); |
| |
| /* another CPU may drop ehci->lock during a schedule scan while |
| * it reports urb completions. this flag guards against bogus |
| * attempts at re-entrant schedule scanning. |
| */ |
| if (ehci->scanning) |
| return; |
| ehci->scanning = 1; |
| scan_async (ehci, regs); |
| if (ehci->next_uframe != -1) |
| scan_periodic (ehci, regs); |
| ehci->scanning = 0; |
| |
| /* the IO watchdog guards against hardware or driver bugs that |
| * misplace IRQs, and should let us run completely without IRQs. |
| * such lossage has been observed on both VT6202 and VT8235. |
| */ |
| if (HC_IS_RUNNING (ehci_to_hcd(ehci)->state) && |
| (ehci->async->qh_next.ptr != NULL || |
| ehci->periodic_sched != 0)) |
| timer_action (ehci, TIMER_IO_WATCHDOG); |
| } |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static irqreturn_t ehci_irq (struct usb_hcd *hcd, struct pt_regs *regs) |
| { |
| struct ehci_hcd *ehci = hcd_to_ehci (hcd); |
| u32 status; |
| int bh; |
| |
| spin_lock (&ehci->lock); |
| |
| status = readl (&ehci->regs->status); |
| |
| /* e.g. cardbus physical eject */ |
| if (status == ~(u32) 0) { |
| ehci_dbg (ehci, "device removed\n"); |
| goto dead; |
| } |
| |
| status &= INTR_MASK; |
| if (!status) { /* irq sharing? */ |
| spin_unlock(&ehci->lock); |
| return IRQ_NONE; |
| } |
| |
| /* clear (just) interrupts */ |
| writel (status, &ehci->regs->status); |
| readl (&ehci->regs->command); /* unblock posted write */ |
| bh = 0; |
| |
| #ifdef EHCI_VERBOSE_DEBUG |
| /* unrequested/ignored: Frame List Rollover */ |
| dbg_status (ehci, "irq", status); |
| #endif |
| |
| /* INT, ERR, and IAA interrupt rates can be throttled */ |
| |
| /* normal [4.15.1.2] or error [4.15.1.1] completion */ |
| if (likely ((status & (STS_INT|STS_ERR)) != 0)) { |
| if (likely ((status & STS_ERR) == 0)) |
| COUNT (ehci->stats.normal); |
| else |
| COUNT (ehci->stats.error); |
| bh = 1; |
| } |
| |
| /* complete the unlinking of some qh [4.15.2.3] */ |
| if (status & STS_IAA) { |
| COUNT (ehci->stats.reclaim); |
| ehci->reclaim_ready = 1; |
| bh = 1; |
| } |
| |
| /* remote wakeup [4.3.1] */ |
| if ((status & STS_PCD) && hcd->remote_wakeup) { |
| unsigned i = HCS_N_PORTS (ehci->hcs_params); |
| |
| /* resume root hub? */ |
| status = readl (&ehci->regs->command); |
| if (!(status & CMD_RUN)) |
| writel (status | CMD_RUN, &ehci->regs->command); |
| |
| while (i--) { |
| status = readl (&ehci->regs->port_status [i]); |
| if (status & PORT_OWNER) |
| continue; |
| if (!(status & PORT_RESUME) |
| || ehci->reset_done [i] != 0) |
| continue; |
| |
| /* start 20 msec resume signaling from this port, |
| * and make khubd collect PORT_STAT_C_SUSPEND to |
| * stop that signaling. |
| */ |
| ehci->reset_done [i] = jiffies + msecs_to_jiffies (20); |
| mod_timer (&hcd->rh_timer, |
| ehci->reset_done [i] + 1); |
| ehci_dbg (ehci, "port %d remote wakeup\n", i + 1); |
| } |
| } |
| |
| /* PCI errors [4.15.2.4] */ |
| if (unlikely ((status & STS_FATAL) != 0)) { |
| /* bogus "fatal" IRQs appear on some chips... why? */ |
| status = readl (&ehci->regs->status); |
| dbg_cmd (ehci, "fatal", readl (&ehci->regs->command)); |
| dbg_status (ehci, "fatal", status); |
| if (status & STS_HALT) { |
| ehci_err (ehci, "fatal error\n"); |
| dead: |
| ehci_reset (ehci); |
| writel (0, &ehci->regs->configured_flag); |
| /* generic layer kills/unlinks all urbs, then |
| * uses ehci_stop to clean up the rest |
| */ |
| bh = 1; |
| } |
| } |
| |
| if (bh) |
| ehci_work (ehci, regs); |
| spin_unlock (&ehci->lock); |
| return IRQ_HANDLED; |
| } |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| /* |
| * non-error returns are a promise to giveback() the urb later |
| * we drop ownership so next owner (or urb unlink) can get it |
| * |
| * urb + dev is in hcd.self.controller.urb_list |
| * we're queueing TDs onto software and hardware lists |
| * |
| * hcd-specific init for hcpriv hasn't been done yet |
| * |
| * NOTE: control, bulk, and interrupt share the same code to append TDs |
| * to a (possibly active) QH, and the same QH scanning code. |
| */ |
| static int ehci_urb_enqueue ( |
| struct usb_hcd *hcd, |
| struct usb_host_endpoint *ep, |
| struct urb *urb, |
| int mem_flags |
| ) { |
| struct ehci_hcd *ehci = hcd_to_ehci (hcd); |
| struct list_head qtd_list; |
| |
| INIT_LIST_HEAD (&qtd_list); |
| |
| switch (usb_pipetype (urb->pipe)) { |
| // case PIPE_CONTROL: |
| // case PIPE_BULK: |
| default: |
| if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags)) |
| return -ENOMEM; |
| return submit_async (ehci, ep, urb, &qtd_list, mem_flags); |
| |
| case PIPE_INTERRUPT: |
| if (!qh_urb_transaction (ehci, urb, &qtd_list, mem_flags)) |
| return -ENOMEM; |
| return intr_submit (ehci, ep, urb, &qtd_list, mem_flags); |
| |
| case PIPE_ISOCHRONOUS: |
| if (urb->dev->speed == USB_SPEED_HIGH) |
| return itd_submit (ehci, urb, mem_flags); |
| else |
| return sitd_submit (ehci, urb, mem_flags); |
| } |
| } |
| |
| static void unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh) |
| { |
| /* if we need to use IAA and it's busy, defer */ |
| if (qh->qh_state == QH_STATE_LINKED |
| && ehci->reclaim |
| && HC_IS_RUNNING (ehci_to_hcd(ehci)->state)) { |
| struct ehci_qh *last; |
| |
| for (last = ehci->reclaim; |
| last->reclaim; |
| last = last->reclaim) |
| continue; |
| qh->qh_state = QH_STATE_UNLINK_WAIT; |
| last->reclaim = qh; |
| |
| /* bypass IAA if the hc can't care */ |
| } else if (!HC_IS_RUNNING (ehci_to_hcd(ehci)->state) && ehci->reclaim) |
| end_unlink_async (ehci, NULL); |
| |
| /* something else might have unlinked the qh by now */ |
| if (qh->qh_state == QH_STATE_LINKED) |
| start_unlink_async (ehci, qh); |
| } |
| |
| /* remove from hardware lists |
| * completions normally happen asynchronously |
| */ |
| |
| static int ehci_urb_dequeue (struct usb_hcd *hcd, struct urb *urb) |
| { |
| struct ehci_hcd *ehci = hcd_to_ehci (hcd); |
| struct ehci_qh *qh; |
| unsigned long flags; |
| |
| spin_lock_irqsave (&ehci->lock, flags); |
| switch (usb_pipetype (urb->pipe)) { |
| // case PIPE_CONTROL: |
| // case PIPE_BULK: |
| default: |
| qh = (struct ehci_qh *) urb->hcpriv; |
| if (!qh) |
| break; |
| unlink_async (ehci, qh); |
| break; |
| |
| case PIPE_INTERRUPT: |
| qh = (struct ehci_qh *) urb->hcpriv; |
| if (!qh) |
| break; |
| switch (qh->qh_state) { |
| case QH_STATE_LINKED: |
| intr_deschedule (ehci, qh); |
| /* FALL THROUGH */ |
| case QH_STATE_IDLE: |
| qh_completions (ehci, qh, NULL); |
| break; |
| default: |
| ehci_dbg (ehci, "bogus qh %p state %d\n", |
| qh, qh->qh_state); |
| goto done; |
| } |
| |
| /* reschedule QH iff another request is queued */ |
| if (!list_empty (&qh->qtd_list) |
| && HC_IS_RUNNING (hcd->state)) { |
| int status; |
| |
| status = qh_schedule (ehci, qh); |
| spin_unlock_irqrestore (&ehci->lock, flags); |
| |
| if (status != 0) { |
| // shouldn't happen often, but ... |
| // FIXME kill those tds' urbs |
| err ("can't reschedule qh %p, err %d", |
| qh, status); |
| } |
| return status; |
| } |
| break; |
| |
| case PIPE_ISOCHRONOUS: |
| // itd or sitd ... |
| |
| // wait till next completion, do it then. |
| // completion irqs can wait up to 1024 msec, |
| break; |
| } |
| done: |
| spin_unlock_irqrestore (&ehci->lock, flags); |
| return 0; |
| } |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| // bulk qh holds the data toggle |
| |
| static void |
| ehci_endpoint_disable (struct usb_hcd *hcd, struct usb_host_endpoint *ep) |
| { |
| struct ehci_hcd *ehci = hcd_to_ehci (hcd); |
| unsigned long flags; |
| struct ehci_qh *qh, *tmp; |
| |
| /* ASSERT: any requests/urbs are being unlinked */ |
| /* ASSERT: nobody can be submitting urbs for this any more */ |
| |
| rescan: |
| spin_lock_irqsave (&ehci->lock, flags); |
| qh = ep->hcpriv; |
| if (!qh) |
| goto done; |
| |
| /* endpoints can be iso streams. for now, we don't |
| * accelerate iso completions ... so spin a while. |
| */ |
| if (qh->hw_info1 == 0) { |
| ehci_vdbg (ehci, "iso delay\n"); |
| goto idle_timeout; |
| } |
| |
| if (!HC_IS_RUNNING (hcd->state)) |
| qh->qh_state = QH_STATE_IDLE; |
| switch (qh->qh_state) { |
| case QH_STATE_LINKED: |
| for (tmp = ehci->async->qh_next.qh; |
| tmp && tmp != qh; |
| tmp = tmp->qh_next.qh) |
| continue; |
| /* periodic qh self-unlinks on empty */ |
| if (!tmp) |
| goto nogood; |
| unlink_async (ehci, qh); |
| /* FALL THROUGH */ |
| case QH_STATE_UNLINK: /* wait for hw to finish? */ |
| idle_timeout: |
| spin_unlock_irqrestore (&ehci->lock, flags); |
| set_current_state (TASK_UNINTERRUPTIBLE); |
| schedule_timeout (1); |
| goto rescan; |
| case QH_STATE_IDLE: /* fully unlinked */ |
| if (list_empty (&qh->qtd_list)) { |
| qh_put (qh); |
| break; |
| } |
| /* else FALL THROUGH */ |
| default: |
| nogood: |
| /* caller was supposed to have unlinked any requests; |
| * that's not our job. just leak this memory. |
| */ |
| ehci_err (ehci, "qh %p (#%02x) state %d%s\n", |
| qh, ep->desc.bEndpointAddress, qh->qh_state, |
| list_empty (&qh->qtd_list) ? "" : "(has tds)"); |
| break; |
| } |
| ep->hcpriv = NULL; |
| done: |
| spin_unlock_irqrestore (&ehci->lock, flags); |
| return; |
| } |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static const struct hc_driver ehci_driver = { |
| .description = hcd_name, |
| .product_desc = "EHCI Host Controller", |
| .hcd_priv_size = sizeof(struct ehci_hcd), |
| |
| /* |
| * generic hardware linkage |
| */ |
| .irq = ehci_irq, |
| .flags = HCD_MEMORY | HCD_USB2, |
| |
| /* |
| * basic lifecycle operations |
| */ |
| .reset = ehci_hc_reset, |
| .start = ehci_start, |
| #ifdef CONFIG_PM |
| .suspend = ehci_suspend, |
| .resume = ehci_resume, |
| #endif |
| .stop = ehci_stop, |
| |
| /* |
| * managing i/o requests and associated device resources |
| */ |
| .urb_enqueue = ehci_urb_enqueue, |
| .urb_dequeue = ehci_urb_dequeue, |
| .endpoint_disable = ehci_endpoint_disable, |
| |
| /* |
| * scheduling support |
| */ |
| .get_frame_number = ehci_get_frame, |
| |
| /* |
| * root hub support |
| */ |
| .hub_status_data = ehci_hub_status_data, |
| .hub_control = ehci_hub_control, |
| .hub_suspend = ehci_hub_suspend, |
| .hub_resume = ehci_hub_resume, |
| }; |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| /* EHCI 1.0 doesn't require PCI */ |
| |
| #ifdef CONFIG_PCI |
| |
| /* PCI driver selection metadata; PCI hotplugging uses this */ |
| static const struct pci_device_id pci_ids [] = { { |
| /* handle any USB 2.0 EHCI controller */ |
| PCI_DEVICE_CLASS(((PCI_CLASS_SERIAL_USB << 8) | 0x20), ~0), |
| .driver_data = (unsigned long) &ehci_driver, |
| }, |
| { /* end: all zeroes */ } |
| }; |
| MODULE_DEVICE_TABLE (pci, pci_ids); |
| |
| /* pci driver glue; this is a "new style" PCI driver module */ |
| static struct pci_driver ehci_pci_driver = { |
| .name = (char *) hcd_name, |
| .id_table = pci_ids, |
| |
| .probe = usb_hcd_pci_probe, |
| .remove = usb_hcd_pci_remove, |
| |
| #ifdef CONFIG_PM |
| .suspend = usb_hcd_pci_suspend, |
| .resume = usb_hcd_pci_resume, |
| #endif |
| }; |
| |
| #endif /* PCI */ |
| |
| |
| #define DRIVER_INFO DRIVER_VERSION " " DRIVER_DESC |
| |
| MODULE_DESCRIPTION (DRIVER_INFO); |
| MODULE_AUTHOR (DRIVER_AUTHOR); |
| MODULE_LICENSE ("GPL"); |
| |
| static int __init init (void) |
| { |
| if (usb_disabled()) |
| return -ENODEV; |
| |
| pr_debug ("%s: block sizes: qh %Zd qtd %Zd itd %Zd sitd %Zd\n", |
| hcd_name, |
| sizeof (struct ehci_qh), sizeof (struct ehci_qtd), |
| sizeof (struct ehci_itd), sizeof (struct ehci_sitd)); |
| |
| return pci_register_driver (&ehci_pci_driver); |
| } |
| module_init (init); |
| |
| static void __exit cleanup (void) |
| { |
| pci_unregister_driver (&ehci_pci_driver); |
| } |
| module_exit (cleanup); |