0f6110ea97
With this patch, the driver code gets complemented with DMA support. The support for master DMA, in turn, cleared the way for using interrupts to wait for the completion of transfers, which largely relieves the CPU compared to the polling PIO mode. Consequently, the new version has a much lower CPU footprint. In the current version, both modes of operation PIO and DMA are functional. However, PIO mode is retained for benchmarking purposes only and will possibly be removed to keep the driver simple. It is disabled in the driver's 'main.cc'.
55 lines
1.0 KiB
C++
55 lines
1.0 KiB
C++
/*
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* \brief SD-card driver for OMAP4 platform
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* \author Norman Feske
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* \date 2012-07-03
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*/
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/* Genode includes */
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#include <base/sleep.h>
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#include <base/printf.h>
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#include <cap_session/connection.h>
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/* local includes */
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#include <driver.h>
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/*
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* MMC1: IRQ 83
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*/
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int main(int argc, char **argv)
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{
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using namespace Genode;
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printf("--- OMAP4 SD card driver ---\n");
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/**
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* Factory used by 'Block::Root' at session creation/destruction time
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*/
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struct Driver_factory : Block::Driver_factory
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{
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Block::Driver *create()
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{
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bool use_dma = true;
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return new (env()->heap()) Block::Omap4_driver(use_dma);
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}
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void destroy(Block::Driver *driver)
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{
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Genode::destroy(env()->heap(),
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static_cast<Block::Omap4_driver *>(driver));
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}
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} driver_factory;
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enum { STACK_SIZE = 4096 };
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static Cap_connection cap;
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static Rpc_entrypoint ep(&cap, STACK_SIZE, "block_ep");
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static Block::Root block_root(&ep, env()->heap(), driver_factory);
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env()->parent()->announce(ep.manage(&block_root));
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sleep_forever();
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return 0;
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}
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