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/*
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 * Copyright (c) 2008 Pavel Rimsky
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup kbd_port
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 * @ingroup  kbd
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 * @{
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 */
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/** @file
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 * @brief   SGCN (Serengeti Console) keyboard port driver.
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 */
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#include <as.h>
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#include <ddi.h>
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#include <async.h>
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#include <kbd.h>
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#include <kbd_port.h>
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#include <sysinfo.h>
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#include <stdio.h>
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#include <thread.h>
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#include <bool.h>
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#define POLL_INTERVAL       10000
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/**
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 * SGCN buffer header. It is placed at the very beginning of the SGCN
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 * buffer.
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 */
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typedef struct {
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    /** hard-wired to "CON" */
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    char magic[4];
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    /** we don't need this */
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    char unused[8];
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    /** offset within the SGCN buffer of the input buffer start */
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    uint32_t in_begin;
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    /** offset within the SGCN buffer of the input buffer end */
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    uint32_t in_end;
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    /** offset within the SGCN buffer of the input buffer read pointer */
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    uint32_t in_rdptr;
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    /** offset within the SGCN buffer of the input buffer write pointer */
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    uint32_t in_wrptr;
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} __attribute__ ((packed)) sgcn_buffer_header_t;
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/*
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 * Returns a pointer to the object of a given type which is placed at the given
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 * offset from the console buffer beginning.
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 */
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#define SGCN_BUFFER(type, offset) \
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        ((type *) (sram_virt_addr + sram_buffer_offset + (offset)))
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/** Returns a pointer to the console buffer header. */
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#define SGCN_BUFFER_HEADER  (SGCN_BUFFER(sgcn_buffer_header_t, 0))
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/**
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 * Virtual address mapped to SRAM.
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 */
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static uintptr_t sram_virt_addr;
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/**
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 * SGCN buffer offset within SGCN.
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 */
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static uintptr_t sram_buffer_offset;
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/* polling thread */
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static void *sgcn_thread_impl(void *arg);
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static volatile bool polling_disabled = false;
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/**
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 * Initializes the SGCN driver.
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 * Maps the physical memory (SRAM) and creates the polling thread.
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 */
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int kbd_port_init(void)
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{
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    sram_virt_addr = (uintptr_t) as_get_mappable_page(sysinfo_value("sram.area.size"));
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    if (physmem_map((void *) sysinfo_value("sram.address.physical"),
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        (void *) sram_virt_addr, sysinfo_value("sram.area.size") / PAGE_SIZE,
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        AS_AREA_READ | AS_AREA_WRITE) != 0) {
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        printf("SGCN: uspace driver could not map physical memory.");
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        return -1;
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    }
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    sram_buffer_offset = sysinfo_value("sram.buffer.offset");
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    thread_id_t tid;
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    int rc;
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    rc = thread_create(sgcn_thread_impl, NULL, "kbd_poll", &tid);
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    if (rc != 0) {
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        return rc;
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    }
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    return 0;
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}
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void kbd_port_yield(void)
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{
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    polling_disabled = true;
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}
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void kbd_port_reclaim(void)
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{
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    polling_disabled = false;
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}
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/**
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 * Handler of the "key pressed" event. Reads codes of all the pressed keys from
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 * the buffer.
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 */
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static void sgcn_key_pressed(void)
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{
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    char c;
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    uint32_t begin = SGCN_BUFFER_HEADER->in_begin;
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    uint32_t end = SGCN_BUFFER_HEADER->in_end;
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    uint32_t size = end - begin;
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    volatile char *buf_ptr = (volatile char *)
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        SGCN_BUFFER(char, SGCN_BUFFER_HEADER->in_rdptr);
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    volatile uint32_t *in_wrptr_ptr = &(SGCN_BUFFER_HEADER->in_wrptr);
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    volatile uint32_t *in_rdptr_ptr = &(SGCN_BUFFER_HEADER->in_rdptr);
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    while (*in_rdptr_ptr != *in_wrptr_ptr) {
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        c = *buf_ptr;
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        *in_rdptr_ptr = (((*in_rdptr_ptr) - begin + 1) % size) + begin;
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        buf_ptr = (volatile char *)
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            SGCN_BUFFER(char, SGCN_BUFFER_HEADER->in_rdptr);
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        kbd_push_scancode(c);
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    }
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}
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/**
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 * Thread to poll SGCN for keypresses.
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 */
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static void *sgcn_thread_impl(void *arg)
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{
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    (void) arg;
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    while (1) {
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        if (polling_disabled == false)
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            sgcn_key_pressed();
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        usleep(POLL_INTERVAL);
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    }
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}
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/** @}
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 */