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2cdcec4fed
The has_hostpc capability bit indicates that the host controller has the
HOSTPC register extensions, but at the same time enables clock disabling
power saving features with the PHY Low Power Clock Disable (PHCD) bit.
However, some host controllers have the HOSTPC extensions but don't
support the low-power feature, so the PHCD bit must not be set on those
controllers. Add a separate capability bit for the low-power feature
instead, and change all existing users of has_hostpc to use this new
capability bit.
The idea for this commit is taken from an old 2012 commit that never got
merged ("disociate chipidea PHY low power suspend control from hostpc")
Inspired-by: Matthieu CASTET <matthieu.castet@parrot.com>
Signed-off-by: Tuomas Tynkkynen <ttynkkynen@nvidia.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
109 lines
2.5 KiB
C
109 lines
2.5 KiB
C
/*
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* host.c - ChipIdea USB host controller driver
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*
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* Copyright (c) 2012 Intel Corporation
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*
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* Author: Alexander Shishkin
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/io.h>
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#include <linux/usb.h>
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#include <linux/usb/hcd.h>
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#include <linux/usb/chipidea.h>
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#include "../host/ehci.h"
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#include "ci.h"
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#include "bits.h"
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#include "host.h"
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static struct hc_driver __read_mostly ci_ehci_hc_driver;
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static irqreturn_t host_irq(struct ci_hdrc *ci)
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{
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return usb_hcd_irq(ci->irq, ci->hcd);
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}
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static int host_start(struct ci_hdrc *ci)
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{
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struct usb_hcd *hcd;
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struct ehci_hcd *ehci;
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int ret;
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if (usb_disabled())
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return -ENODEV;
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hcd = usb_create_hcd(&ci_ehci_hc_driver, ci->dev, dev_name(ci->dev));
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if (!hcd)
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return -ENOMEM;
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dev_set_drvdata(ci->dev, ci);
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hcd->rsrc_start = ci->hw_bank.phys;
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hcd->rsrc_len = ci->hw_bank.size;
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hcd->regs = ci->hw_bank.abs;
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hcd->has_tt = 1;
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hcd->power_budget = ci->platdata->power_budget;
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hcd->phy = ci->transceiver;
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ehci = hcd_to_ehci(hcd);
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ehci->caps = ci->hw_bank.cap;
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ehci->has_hostpc = ci->hw_bank.lpm;
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ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
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ret = usb_add_hcd(hcd, 0, 0);
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if (ret)
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usb_put_hcd(hcd);
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else
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ci->hcd = hcd;
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if (ci->platdata->flags & CI_HDRC_DISABLE_STREAMING)
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hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS, USBMODE_CI_SDIS);
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return ret;
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}
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static void host_stop(struct ci_hdrc *ci)
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{
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struct usb_hcd *hcd = ci->hcd;
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usb_remove_hcd(hcd);
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usb_put_hcd(hcd);
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}
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int ci_hdrc_host_init(struct ci_hdrc *ci)
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{
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struct ci_role_driver *rdrv;
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if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
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return -ENXIO;
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rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
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if (!rdrv)
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return -ENOMEM;
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rdrv->start = host_start;
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rdrv->stop = host_stop;
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rdrv->irq = host_irq;
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rdrv->name = "host";
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ci->roles[CI_ROLE_HOST] = rdrv;
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ehci_init_driver(&ci_ehci_hc_driver, NULL);
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return 0;
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}
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