/* * otg.c - ChipIdea USB IP core OTG driver * * Copyright (C) 2013 Freescale Semiconductor, Inc. * * Author: Peter Chen * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ /* * This file mainly handles otgsc register, OTG fsm operations for HNP and SRP * are also included. */ #include #include #include #include "ci.h" #include "bits.h" #include "otg.h" #include "otg_fsm.h" /** * hw_read_otgsc returns otgsc register bits value. * @mask: bitfield mask */ u32 hw_read_otgsc(struct ci_hdrc *ci, u32 mask) { struct ci_hdrc_cable *cable; u32 val = hw_read(ci, OP_OTGSC, mask); /* * If using extcon framework for VBUS and/or ID signal * detection overwrite OTGSC register value */ cable = &ci->platdata->vbus_extcon; if (!IS_ERR(cable->edev)) { if (cable->changed) val |= OTGSC_BSVIS; else val &= ~OTGSC_BSVIS; cable->changed = false; if (cable->state) val |= OTGSC_BSV; else val &= ~OTGSC_BSV; } cable = &ci->platdata->id_extcon; if (!IS_ERR(cable->edev)) { if (cable->changed) val |= OTGSC_IDIS; else val &= ~OTGSC_IDIS; cable->changed = false; if (cable->state) val |= OTGSC_ID; else val &= ~OTGSC_ID; } return val; } /** * hw_write_otgsc updates target bits of OTGSC register. * @mask: bitfield mask * @data: to be written */ void hw_write_otgsc(struct ci_hdrc *ci, u32 mask, u32 data) { hw_write(ci, OP_OTGSC, mask | OTGSC_INT_STATUS_BITS, data); } /** * ci_otg_role - pick role based on ID pin state * @ci: the controller */ enum ci_role ci_otg_role(struct ci_hdrc *ci) { enum ci_role role = hw_read_otgsc(ci, OTGSC_ID) ? CI_ROLE_GADGET : CI_ROLE_HOST; return role; } void ci_handle_vbus_change(struct ci_hdrc *ci) { if (!ci->is_otg) return; if (hw_read_otgsc(ci, OTGSC_BSV)) usb_gadget_vbus_connect(&ci->gadget); else usb_gadget_vbus_disconnect(&ci->gadget); } #define CI_VBUS_STABLE_TIMEOUT_MS 5000 static void ci_handle_id_switch(struct ci_hdrc *ci) { enum ci_role role = ci_otg_role(ci); if (role != ci->role) { dev_dbg(ci->dev, "switching from %s to %s\n", ci_role(ci)->name, ci->roles[role]->name); ci_role_stop(ci); if (role == CI_ROLE_GADGET) /* wait vbus lower than OTGSC_BSV */ hw_wait_reg(ci, OP_OTGSC, OTGSC_BSV, 0, CI_VBUS_STABLE_TIMEOUT_MS); ci_role_start(ci, role); } } /** * ci_otg_work - perform otg (vbus/id) event handle * @work: work struct */ static void ci_otg_work(struct work_struct *work) { struct ci_hdrc *ci = container_of(work, struct ci_hdrc, work); if (ci_otg_is_fsm_mode(ci) && !ci_otg_fsm_work(ci)) { enable_irq(ci->irq); return; } pm_runtime_get_sync(ci->dev); if (ci->id_event) { ci->id_event = false; ci_handle_id_switch(ci); } else if (ci->b_sess_valid_event) { ci->b_sess_valid_event = false; ci_handle_vbus_change(ci); } else dev_err(ci->dev, "unexpected event occurs at %s\n", __func__); pm_runtime_put_sync(ci->dev); enable_irq(ci->irq); } /** * ci_hdrc_otg_init - initialize otg struct * ci: the controller */ int ci_hdrc_otg_init(struct ci_hdrc *ci) { INIT_WORK(&ci->work, ci_otg_work); ci->wq = create_freezable_workqueue("ci_otg"); if (!ci->wq) { dev_err(ci->dev, "can't create workqueue\n"); return -ENODEV; } if (ci_otg_is_fsm_mode(ci)) return ci_hdrc_otg_fsm_init(ci); return 0; } /** * ci_hdrc_otg_destroy - destroy otg struct * ci: the controller */ void ci_hdrc_otg_destroy(struct ci_hdrc *ci) { if (ci->wq) { flush_workqueue(ci->wq); destroy_workqueue(ci->wq); } /* Disable all OTG irq and clear status */ hw_write_otgsc(ci, OTGSC_INT_EN_BITS | OTGSC_INT_STATUS_BITS, OTGSC_INT_STATUS_BITS); if (ci_otg_is_fsm_mode(ci)) ci_hdrc_otg_fsm_remove(ci); } ion>
authorLinus Torvalds <torvalds@linux-foundation.org>2016-12-12 21:58:13 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-12 21:58:13 -0800
commite7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba (patch)
treef63906f41699c8e38af9d12b063e2ceab0286ef2 /scripts/coccinelle/api/vma_pages.cocci
parente34bac726d27056081d0250c0e173e4b155aa340 (diff)
parent868c97a846a73e937d835b09b8c885a69df50ec8 (diff)
Merge tag 'docs-4.10' of git://git.lwn.net/linuxHEADmaster
Pull documentation update from Jonathan Corbet: "These are the documentation changes for 4.10. It's another busy cycle for the docs tree, as the sphinx conversion continues. Highlights include: - Further work on PDF output, which remains a bit of a pain but should be more solid now. - Five more DocBook template files converted to Sphinx. Only 27 to go... Lots of plain-text files have also been converted and integrated. - Images in binary formats have been replaced with more source-friendly versions. - Various bits of organizational work, including the renaming of various files discussed at the kernel summit. - New documentation for the device_link mechanism. ... and, of course, lots of typo fixes and small updates" * tag 'docs-4.10' of git://git.lwn.net/linux: (193 commits) dma-buf: Extract dma-buf.rst Update Documentation/00-INDEX docs: 00-INDEX: document directories/files with no docs docs: 00-INDEX: remove non-existing entries docs: 00-INDEX: add missing entries for documentation files/dirs docs: 00-INDEX: consolidate process/ and admin-guide/ description scripts: add a script to check if Documentation/00-INDEX is sane Docs: change sh -> awk in REPORTING-BUGS Documentation/core-api/device_link: Add initial documentation core-api: remove an unexpected unident ppc/idle: Add documentation for powersave=off Doc: Correct typo, "Introdution" => "Introduction" Documentation/atomic_ops.txt: convert to ReST markup Documentation/local_ops.txt: convert to ReST markup Documentation/assoc_array.txt: convert to ReST markup docs-rst: parse-headers.pl: cleanup the documentation docs-rst: fix media cleandocs target docs-rst: media/Makefile: reorganize the rules docs-rst: media: build SVG from graphviz files docs-rst: replace bayer.png by a SVG image ...
Diffstat (limited to 'scripts/coccinelle/api/vma_pages.cocci')