| Alek Du | 48f2497 | 2010-06-04 15:47:55 +0800 | [diff] [blame] | 1 | /* ehci-lpm.c EHCI HCD LPM support code |
| 2 | * Copyright (c) 2008 - 2010, Intel Corporation. |
| 3 | * Author: Jacob Pan <jacob.jun.pan@intel.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 17 | */ |
| 18 | |
| 19 | /* this file is part of ehci-hcd.c */ |
| 20 | static int ehci_lpm_set_da(struct ehci_hcd *ehci, int dev_addr, int port_num) |
| 21 | { |
| 22 | u32 __iomem portsc; |
| 23 | |
| 24 | ehci_dbg(ehci, "set dev address %d for port %d\n", dev_addr, port_num); |
| 25 | if (port_num > HCS_N_PORTS(ehci->hcs_params)) { |
| 26 | ehci_dbg(ehci, "invalid port number %d\n", port_num); |
| 27 | return -ENODEV; |
| 28 | } |
| 29 | portsc = ehci_readl(ehci, &ehci->regs->port_status[port_num-1]); |
| 30 | portsc &= ~PORT_DEV_ADDR; |
| 31 | portsc |= dev_addr<<25; |
| 32 | ehci_writel(ehci, portsc, &ehci->regs->port_status[port_num-1]); |
| 33 | return 0; |
| 34 | } |
| 35 | |
| 36 | /* |
| 37 | * this function is used to check if the device support LPM |
| 38 | * if yes, mark the PORTSC register with PORT_LPM bit |
| 39 | */ |
| 40 | static int ehci_lpm_check(struct ehci_hcd *ehci, int port) |
| 41 | { |
| 42 | u32 __iomem *portsc ; |
| 43 | u32 val32; |
| 44 | int retval; |
| 45 | |
| 46 | portsc = &ehci->regs->port_status[port-1]; |
| 47 | val32 = ehci_readl(ehci, portsc); |
| 48 | if (!(val32 & PORT_DEV_ADDR)) { |
| 49 | ehci_dbg(ehci, "LPM: no device attached\n"); |
| 50 | return -ENODEV; |
| 51 | } |
| 52 | val32 |= PORT_LPM; |
| 53 | ehci_writel(ehci, val32, portsc); |
| 54 | msleep(5); |
| 55 | val32 |= PORT_SUSPEND; |
| 56 | ehci_dbg(ehci, "Sending LPM 0x%08x to port %d\n", val32, port); |
| 57 | ehci_writel(ehci, val32, portsc); |
| 58 | /* wait for ACK */ |
| 59 | msleep(10); |
| 60 | retval = handshake(ehci, &ehci->regs->port_status[port-1], PORT_SSTS, |
| 61 | PORTSC_SUSPEND_STS_ACK, 125); |
| 62 | dbg_port(ehci, "LPM", port, val32); |
| 63 | if (retval != -ETIMEDOUT) { |
| 64 | ehci_dbg(ehci, "LPM: device ACK for LPM\n"); |
| 65 | val32 |= PORT_LPM; |
| 66 | /* |
| 67 | * now device should be in L1 sleep, let's wake up the device |
| 68 | * so that we can complete enumeration. |
| 69 | */ |
| 70 | ehci_writel(ehci, val32, portsc); |
| 71 | msleep(10); |
| 72 | val32 |= PORT_RESUME; |
| 73 | ehci_writel(ehci, val32, portsc); |
| 74 | } else { |
| 75 | ehci_dbg(ehci, "LPM: device does not ACK, disable LPM %d\n", |
| 76 | retval); |
| 77 | val32 &= ~PORT_LPM; |
| 78 | retval = -ETIMEDOUT; |
| 79 | ehci_writel(ehci, val32, portsc); |
| 80 | } |
| 81 | |
| 82 | return retval; |
| 83 | } |