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7f6f710bd2
A reset domain can consist of one or several reset-pins
denoted by name that are assigned to a device.
When the device gets acquired via the Platform RPC API,
the pins are de-asserted, and asserted again when the
device gets released.
A configuration looks like the following:
<device name="mipi_dsi>
<reset-domain name="mipi_dsi_pclk"/>
...
</device>
Fixes #4171
81 lines
2.2 KiB
C++
81 lines
2.2 KiB
C++
/*
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* \brief Platform driver - Device abstraction for i.MX
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* \author Stefan Kalkowski
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* \date 2020-08-17
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*/
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/*
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* Copyright (C) 2020 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#include <imx_device.h>
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#include <clock.h>
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#include <session_component.h>
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bool Driver::Imx_device::acquire(Driver::Session_component & sc)
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{
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bool ret = Driver::Device::acquire(sc);
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if (ret) {
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_power_domain_list.for_each([&] (Power_domain & p) {
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sc.env().gpc.enable(p.name); });
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_reset_domain_list.for_each([&] (Reset_domain & r) {
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sc.env().src.enable(r.name); });
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_clock_list.for_each([&] (Clock & c) {
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Avl_string_base * asb =
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sc.env().ccm.tree.first()->find_by_name(c.name.string());
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if (!asb) {
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Genode::warning("Clock ", c.name, " is unknown! ");
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return;
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}
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Driver::Clock & clock =
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static_cast<Driver::Clock::Clock_tree_element*>(asb)->object();
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if (c.parent.valid()) { clock.set_parent(c.parent); }
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if (c.rate) { clock.set_rate(c.rate); }
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clock.enable();
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});
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sc.update_devices_rom();
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}
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return ret;
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}
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void Driver::Imx_device::release(Session_component & sc)
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{
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_reset_domain_list.for_each([&] (Reset_domain & r) {
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sc.env().src.disable(r.name); });
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_power_domain_list.for_each([&] (Power_domain & p) {
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sc.env().gpc.disable(p.name); });
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_clock_list.for_each([&] (Clock & c) {
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Avl_string_base * asb =
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sc.env().ccm.tree.first()->find_by_name(c.name.string());
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if (!asb) { return; }
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static_cast<Driver::Clock::Clock_tree_element*>(asb)->object().disable();
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});
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return Driver::Device::release(sc);
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}
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void Driver::Imx_device::_report_platform_specifics(Genode::Xml_generator & xml,
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Driver::Session_component & sc)
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{
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_clock_list.for_each([&] (Clock & c) {
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Avl_string_base * asb =
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sc.env().ccm.tree.first()->find_by_name(c.name.string());
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if (!asb || !c.driver_name.valid()) { return; }
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Driver::Clock & clock =
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static_cast<Driver::Clock::Clock_tree_element*>(asb)->object();
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xml.node("clock", [&] () {
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xml.attribute("rate", clock.get_rate());
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xml.attribute("name", c.driver_name);
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});
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});
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}
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