WebSVN – HelenOS – Blame – /tags/0.4.1/uspace/srv/kbd/port/sgcn.c

Rev	Author	Line No.	Line
3924	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>
4070	rimsky	44	#include <thread.h>
3924	svoboda	45
4070	rimsky	46	#define POLL_INTERVAL 10000
		47
3924	svoboda	48	/**
		49	* SGCN buffer header. It is placed at the very beginning of the SGCN
		50	* buffer.
		51	*/
		52	typedef struct {
		53	/** hard-wired to "CON" */
		54	char magic[4];
		55
		56	/** we don't need this */
		57	char unused[8];
		58
		59	/** offset within the SGCN buffer of the input buffer start */
		60	uint32_t in_begin;
		61
		62	/** offset within the SGCN buffer of the input buffer end */
		63	uint32_t in_end;
		64
		65	/** offset within the SGCN buffer of the input buffer read pointer */
		66	uint32_t in_rdptr;
		67
		68	/** offset within the SGCN buffer of the input buffer write pointer */
		69	uint32_t in_wrptr;
		70	} __attribute__ ((packed)) sgcn_buffer_header_t;
		71
		72	/*
		73	* Returns a pointer to the object of a given type which is placed at the given
		74	* offset from the console buffer beginning.
		75	*/
		76	#define SGCN_BUFFER(type, offset) \
		77	((type *) (sram_virt_addr + sram_buffer_offset + (offset)))
		78
		79	/** Returns a pointer to the console buffer header. */
		80	#define SGCN_BUFFER_HEADER (SGCN_BUFFER(sgcn_buffer_header_t, 0))
		81
		82	/**
		83	* Virtual address mapped to SRAM.
		84	*/
		85	static uintptr_t sram_virt_addr;
		86
		87	/**
		88	* SGCN buffer offset within SGCN.
		89	*/
		90	static uintptr_t sram_buffer_offset;
		91
4070	rimsky	92	/* polling thread */
		93	static void sgcn_thread_impl(void arg);
3924	svoboda	94
		95
		96	/**
		97	* Initializes the SGCN driver.
4070	rimsky	98	* Maps the physical memory (SRAM) and creates the polling thread.
3924	svoboda	99	*/
		100	int kbd_port_init(void)
		101	{
		102	sram_virt_addr = (uintptr_t) as_get_mappable_page(sysinfo_value("sram.area.size"));
		103	if (physmem_map((void *) sysinfo_value("sram.address.physical"),
		104	(void *) sram_virt_addr, sysinfo_value("sram.area.size") / PAGE_SIZE,
		105	AS_AREA_READ \| AS_AREA_WRITE) != 0) {
		106	printf("SGCN: uspace driver could not map physical memory.");
		107	return -1;
		108	}
		109
		110	sram_buffer_offset = sysinfo_value("sram.buffer.offset");
4070	rimsky	111
		112	thread_id_t tid;
		113	int rc;
		114
		115	rc = thread_create(sgcn_thread_impl, NULL, "kbd_poll", &tid);
		116	if (rc != 0) {
		117	return rc;
		118	}
		119
3924	svoboda	120	return 0;
		121	}
		122
4329	svoboda	123	void kbd_port_yield(void)
		124	{
		125	}
		126
		127	void kbd_port_reclaim(void)
		128	{
		129	}
		130
3924	svoboda	131	/**
		132	* Handler of the "key pressed" event. Reads codes of all the pressed keys from
		133	* the buffer.
		134	*/
4070	rimsky	135	static void sgcn_key_pressed(void)
3924	svoboda	136	{
		137	char c;
		138
		139	uint32_t begin = SGCN_BUFFER_HEADER->in_begin;
		140	uint32_t end = SGCN_BUFFER_HEADER->in_end;
		141	uint32_t size = end - begin;
		142
		143	volatile char buf_ptr = (volatile char )
		144	SGCN_BUFFER(char, SGCN_BUFFER_HEADER->in_rdptr);
		145	volatile uint32_t *in_wrptr_ptr = &(SGCN_BUFFER_HEADER->in_wrptr);
		146	volatile uint32_t *in_rdptr_ptr = &(SGCN_BUFFER_HEADER->in_rdptr);
		147
		148	while (in_rdptr_ptr != in_wrptr_ptr) {
		149	c = *buf_ptr;
		150	in_rdptr_ptr = (((in_rdptr_ptr) - begin + 1) % size) + begin;
		151	buf_ptr = (volatile char *)
		152	SGCN_BUFFER(char, SGCN_BUFFER_HEADER->in_rdptr);
		153	kbd_push_scancode(c);
		154	}
		155	}
		156
4070	rimsky	157	/**
		158	* Thread to poll SGCN for keypresses.
		159	*/
		160	static void sgcn_thread_impl(void arg)
		161	{
		162	(void) arg;
		163
		164	while (1) {
		165	sgcn_key_pressed();
		166	usleep(POLL_INTERVAL);
		167	}
		168	}
		169
		170
3924	svoboda	171	/** @}
		172	*/

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