WebSVN – HelenOS – Blame – /branches/tracing/uspace/srv/kbd/port/sgcn.c

Rev	Author	Line No.	Line
4377	svoboda	1	/*
		2	* Copyright (c) 2008 Pavel Rimsky
		3	* All rights reserved.
		4	*
		5	* Redistribution and use in source and binary forms, with or without
		6	* modification, are permitted provided that the following conditions
		7	* are met:
		8	*
		9	* - Redistributions of source code must retain the above copyright
		10	* notice, this list of conditions and the following disclaimer.
		11	* - Redistributions in binary form must reproduce the above copyright
		12	* notice, this list of conditions and the following disclaimer in the
		13	* documentation and/or other materials provided with the distribution.
		14	* - The name of the author may not be used to endorse or promote products
		15	* derived from this software without specific prior written permission.
		16	*
		17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
		18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
		19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
		20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
		21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
		22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
		26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		27	*/
		28
		29	/** @addtogroup kbd_port
		30	* @ingroup kbd
		31	* @{
		32	*/
		33	/** @file
		34	* @brief SGCN (Serengeti Console) keyboard port driver.
		35	*/
		36
		37	#include <as.h>
		38	#include <ddi.h>
		39	#include <async.h>
		40	#include <kbd.h>
		41	#include <kbd_port.h>
		42	#include <sysinfo.h>
		43	#include <stdio.h>
		44	#include <thread.h>
		45	#include <bool.h>
		46
		47	#define POLL_INTERVAL 10000
		48
		49	/**
		50	* SGCN buffer header. It is placed at the very beginning of the SGCN
		51	* buffer.
		52	*/
		53	typedef struct {
		54	/** hard-wired to "CON" */
		55	char magic[4];
		56
		57	/** we don't need this */
		58	char unused[8];
		59
		60	/** offset within the SGCN buffer of the input buffer start */
		61	uint32_t in_begin;
		62
		63	/** offset within the SGCN buffer of the input buffer end */
		64	uint32_t in_end;
		65
		66	/** offset within the SGCN buffer of the input buffer read pointer */
		67	uint32_t in_rdptr;
		68
		69	/** offset within the SGCN buffer of the input buffer write pointer */
		70	uint32_t in_wrptr;
		71	} __attribute__ ((packed)) sgcn_buffer_header_t;
		72
		73	/*
		74	* Returns a pointer to the object of a given type which is placed at the given
		75	* offset from the console buffer beginning.
		76	*/
		77	#define SGCN_BUFFER(type, offset) \
		78	((type *) (sram_virt_addr + sram_buffer_offset + (offset)))
		79
		80	/** Returns a pointer to the console buffer header. */
		81	#define SGCN_BUFFER_HEADER (SGCN_BUFFER(sgcn_buffer_header_t, 0))
		82
		83	/**
		84	* Virtual address mapped to SRAM.
		85	*/
		86	static uintptr_t sram_virt_addr;
		87
		88	/**
		89	* SGCN buffer offset within SGCN.
		90	*/
		91	static uintptr_t sram_buffer_offset;
		92
		93	/* polling thread */
		94	static void sgcn_thread_impl(void arg);
		95
		96	static volatile bool polling_disabled = false;
		97
		98	/**
		99	* Initializes the SGCN driver.
		100	* Maps the physical memory (SRAM) and creates the polling thread.
		101	*/
		102	int kbd_port_init(void)
		103	{
		104	sram_virt_addr = (uintptr_t) as_get_mappable_page(sysinfo_value("sram.area.size"));
		105	if (physmem_map((void *) sysinfo_value("sram.address.physical"),
		106	(void *) sram_virt_addr, sysinfo_value("sram.area.size") / PAGE_SIZE,
		107	AS_AREA_READ \| AS_AREA_WRITE) != 0) {
		108	printf("SGCN: uspace driver could not map physical memory.");
		109	return -1;
		110	}
		111
		112	sram_buffer_offset = sysinfo_value("sram.buffer.offset");
		113
		114	thread_id_t tid;
		115	int rc;
		116
		117	rc = thread_create(sgcn_thread_impl, NULL, "kbd_poll", &tid);
		118	if (rc != 0) {
		119	return rc;
		120	}
		121
		122	return 0;
		123	}
		124
		125	void kbd_port_yield(void)
		126	{
		127	polling_disabled = true;
		128	}
		129
		130	void kbd_port_reclaim(void)
		131	{
		132	polling_disabled = false;
		133	}
		134
		135	/**
		136	* Handler of the "key pressed" event. Reads codes of all the pressed keys from
		137	* the buffer.
		138	*/
		139	static void sgcn_key_pressed(void)
		140	{
		141	char c;
		142
		143	uint32_t begin = SGCN_BUFFER_HEADER->in_begin;
		144	uint32_t end = SGCN_BUFFER_HEADER->in_end;
		145	uint32_t size = end - begin;
		146
		147	volatile char buf_ptr = (volatile char )
		148	SGCN_BUFFER(char, SGCN_BUFFER_HEADER->in_rdptr);
		149	volatile uint32_t *in_wrptr_ptr = &(SGCN_BUFFER_HEADER->in_wrptr);
		150	volatile uint32_t *in_rdptr_ptr = &(SGCN_BUFFER_HEADER->in_rdptr);
		151
		152	while (in_rdptr_ptr != in_wrptr_ptr) {
		153	c = *buf_ptr;
		154	in_rdptr_ptr = (((in_rdptr_ptr) - begin + 1) % size) + begin;
		155	buf_ptr = (volatile char *)
		156	SGCN_BUFFER(char, SGCN_BUFFER_HEADER->in_rdptr);
		157	kbd_push_scancode(c);
		158	}
		159	}
		160
		161	/**
		162	* Thread to poll SGCN for keypresses.
		163	*/
		164	static void sgcn_thread_impl(void arg)
		165	{
		166	(void) arg;
		167
		168	while (1) {
		169	if (polling_disabled == false)
		170	sgcn_key_pressed();
		171	usleep(POLL_INTERVAL);
		172	}
		173	}
		174
		175	/** @}
		176	*/

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