isa.c

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/*
 * Copyright (c) 2010 Lenka Trochtova
 * Copyright (c) 2011 Jiri Svoboda
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <assert.h>
#include <stdio.h>
#include <errno.h>
#include <bool.h>
#include <fibril_synch.h>
#include <stdlib.h>
#include <str.h>
#include <str_error.h>
#include <ctype.h>
#include <macros.h>
#include <malloc.h>
#include <dirent.h>
#include <fcntl.h>
#include <sys/stat.h>

#include <ddf/driver.h>
#include <ddf/log.h>
#include <ops/hw_res.h>

#include <devman.h>
#include <ipc/devman.h>
#include <device/hw_res.h>

#define NAME "isa"
#define CHILD_FUN_CONF_PATH "/drv/isa/isa.dev"

#define ISA_FUN(fnode) ((isa_fun_t *) ((fnode)->driver_data))

#define ISA_MAX_HW_RES 4

typedef struct isa_fun {
        ddf_fun_t *fnode;
        hw_resource_list_t hw_resources;
} isa_fun_t;

static hw_resource_list_t *isa_get_fun_resources(ddf_fun_t *fnode)
{
        isa_fun_t *fun = ISA_FUN(fnode);
        assert(fun != NULL);

        return &fun->hw_resources;
}

static bool isa_enable_fun_interrupt(ddf_fun_t *fnode)
{
        /* TODO */

        return false;
}

static hw_res_ops_t isa_fun_hw_res_ops = {
        &isa_get_fun_resources,
        &isa_enable_fun_interrupt
};

static ddf_dev_ops_t isa_fun_ops;

static int isa_add_device(ddf_dev_t *dev);

static driver_ops_t isa_ops = {
        .add_device = &isa_add_device
};

static driver_t isa_driver = {
        .name = NAME,
        .driver_ops = &isa_ops
};

static isa_fun_t *isa_fun_create(ddf_dev_t *dev, const char *name)
{
        isa_fun_t *fun = calloc(1, sizeof(isa_fun_t));
        if (fun == NULL)
                return NULL;

        ddf_fun_t *fnode = ddf_fun_create(dev, fun_inner, name);
        if (fnode == NULL) {
                free(fun);
                return NULL;
        }

        fun->fnode = fnode;
        fnode->driver_data = fun;
        return fun;
}

static char *fun_conf_read(const char *conf_path)
{
        bool suc = false;
        char *buf = NULL;
        bool opened = false;
        int fd;
        size_t len = 0;

        fd = open(conf_path, O_RDONLY);
        if (fd < 0) {
                ddf_msg(LVL_ERROR, "Unable to open %s", conf_path);
                goto cleanup;
        }

        opened = true;

        len = lseek(fd, 0, SEEK_END);
        lseek(fd, 0, SEEK_SET);
        if (len == 0) {
                ddf_msg(LVL_ERROR, "Configuration file '%s' is empty.",
                    conf_path);
                goto cleanup;
        }

        buf = malloc(len + 1);
        if (buf == NULL) {
                ddf_msg(LVL_ERROR, "Memory allocation failed.");
                goto cleanup;
        }

        if (0 >= read(fd, buf, len)) {
                ddf_msg(LVL_ERROR, "Unable to read file '%s'.", conf_path);
                goto cleanup;
        }

        buf[len] = 0;

        suc = true;

cleanup:
        if (!suc && buf != NULL) {
                free(buf);
                buf = NULL;
        }

        if (opened)
                close(fd);

        return buf;
}

static char *str_get_line(char *str, char **next)
{
        char *line = str;

        if (str == NULL) {
                *next = NULL;
                return NULL;
        }

        while (*str != '\0' && *str != '\n') {
                str++;
        }

        if (*str != '\0') {
                *next = str + 1;
        } else {
                *next = NULL;
        }

        *str = '\0';
        return line;
}

static bool line_empty(const char *line)
{
        while (line != NULL && *line != 0) {
                if (!isspace(*line))
                        return false;
                line++;
        }

        return true;
}

static char *get_device_name(char *line)
{
        /* Skip leading spaces. */
        while (*line != '\0' && isspace(*line)) {
                line++;
        }

        /* Get the name part of the rest of the line. */
        strtok(line, ":");

        /* Allocate output buffer. */
        size_t size = str_size(line) + 1;
        char *name = malloc(size);

        if (name != NULL) {
                /* Copy the result to the output buffer. */
                str_cpy(name, size, line);
        }

        return name;
}

static inline char *skip_spaces(char *line)
{
        /* Skip leading spaces. */
        while (*line != '\0' && isspace(*line))
                line++;

        return line;
}

static void isa_fun_set_irq(isa_fun_t *fun, int irq)
{
        size_t count = fun->hw_resources.count;
        hw_resource_t *resources = fun->hw_resources.resources;

        if (count < ISA_MAX_HW_RES) {
                resources[count].type = INTERRUPT;
                resources[count].res.interrupt.irq = irq;

                fun->hw_resources.count++;

                ddf_msg(LVL_NOTE, "Added irq 0x%x to function %s", irq,
                    fun->fnode->name);
        }
}

static void isa_fun_set_io_range(isa_fun_t *fun, size_t addr, size_t len)
{
        size_t count = fun->hw_resources.count;
        hw_resource_t *resources = fun->hw_resources.resources;

        if (count < ISA_MAX_HW_RES) {
                resources[count].type = IO_RANGE;
                resources[count].res.io_range.address = addr;
                resources[count].res.io_range.size = len;
                resources[count].res.io_range.endianness = LITTLE_ENDIAN;

                fun->hw_resources.count++;

                ddf_msg(LVL_NOTE, "Added io range (addr=0x%x, size=0x%x) to "
                    "function %s", (unsigned int) addr, (unsigned int) len,
                    fun->fnode->name);
        }
}

static void fun_parse_irq(isa_fun_t *fun, char *val)
{
        int irq = 0;
        char *end = NULL;

        val = skip_spaces(val);
        irq = (int)strtol(val, &end, 0x10);

        if (val != end)
                isa_fun_set_irq(fun, irq);
}

static void fun_parse_io_range(isa_fun_t *fun, char *val)
{
        size_t addr, len;
        char *end = NULL;

        val = skip_spaces(val);
        addr = strtol(val, &end, 0x10);

        if (val == end)
                return;

        val = skip_spaces(end);
        len = strtol(val, &end, 0x10);

        if (val == end)
                return;

        isa_fun_set_io_range(fun, addr, len);
}

static void get_match_id(char **id, char *val)
{
        char *end = val;

        while (!isspace(*end))
                end++;

        size_t size = end - val + 1;
        *id = (char *)malloc(size);
        str_cpy(*id, size, val);
}

static void fun_parse_match_id(isa_fun_t *fun, char *val)
{
        char *id = NULL;
        int score = 0;
        char *end = NULL;
        int rc;

        val = skip_spaces(val);

        score = (int)strtol(val, &end, 10);
        if (val == end) {
                ddf_msg(LVL_ERROR, "Cannot read match score for function "
                    "%s.", fun->fnode->name);
                return;
        }

        val = skip_spaces(end);
        get_match_id(&id, val);
        if (id == NULL) {
                ddf_msg(LVL_ERROR, "Cannot read match ID for function %s.",
                    fun->fnode->name);
                return;
        }

        ddf_msg(LVL_DEBUG, "Adding match id '%s' with score %d to "
            "function %s", id, score, fun->fnode->name);

        rc = ddf_fun_add_match_id(fun->fnode, id, score);
        if (rc != EOK) {
                ddf_msg(LVL_ERROR, "Failed adding match ID: %s",
                    str_error(rc));
        }
}

static bool prop_parse(isa_fun_t *fun, char *line, const char *prop,
    void (*read_fn)(isa_fun_t *, char *))
{
        size_t proplen = str_size(prop);

        if (str_lcmp(line, prop, proplen) == 0) {
                line += proplen;
                line = skip_spaces(line);
                (*read_fn)(fun, line);

                return true;
        }

        return false;
}

static void fun_prop_parse(isa_fun_t *fun, char *line)
{
        /* Skip leading spaces. */
        line = skip_spaces(line);

        if (!prop_parse(fun, line, "io_range", &fun_parse_io_range) &&
            !prop_parse(fun, line, "irq", &fun_parse_irq) &&
            !prop_parse(fun, line, "match", &fun_parse_match_id)) {

                ddf_msg(LVL_ERROR, "Undefined device property at line '%s'",
                    line);
        }
}

static void fun_hw_res_alloc(isa_fun_t *fun)
{
        fun->hw_resources.resources = 
            (hw_resource_t *)malloc(sizeof(hw_resource_t) * ISA_MAX_HW_RES);
}

static char *isa_fun_read_info(char *fun_conf, ddf_dev_t *dev)
{
        char *line;
        char *fun_name = NULL;

        /* Skip empty lines. */
        while (true) {
                line = str_get_line(fun_conf, &fun_conf);

                if (line == NULL) {
                        /* no more lines */
                        return NULL;
                }

                if (!line_empty(line))
                        break;
        }

        /* Get device name. */
        fun_name = get_device_name(line);
        if (fun_name == NULL)
                return NULL;

        isa_fun_t *fun = isa_fun_create(dev, fun_name);
        if (fun == NULL) {
                free(fun_name);
                return NULL;
        }

        /* Allocate buffer for the list of hardware resources of the device. */
        fun_hw_res_alloc(fun);

        /* Get properties of the device (match ids, irq and io range). */
        while (true) {
                line = str_get_line(fun_conf, &fun_conf);

                if (line_empty(line)) {
                        /* no more device properties */
                        break;
                }

                /*
                 * Get the device's property from the configuration line
                 * and store it in the device structure.
                 */
                fun_prop_parse(fun, line);
        }

        /* Set device operations to the device. */
        fun->fnode->ops = &isa_fun_ops;

        ddf_msg(LVL_DEBUG, "Binding function %s.", fun->fnode->name);

        /* XXX Handle error */
        (void) ddf_fun_bind(fun->fnode);

        return fun_conf;
}

static void fun_conf_parse(char *conf, ddf_dev_t *dev)
{
        while (conf != NULL && *conf != '\0') {
                conf = isa_fun_read_info(conf, dev);
        }
}

static void isa_functions_add(ddf_dev_t *dev)
{
        char *fun_conf;

        fun_conf = fun_conf_read(CHILD_FUN_CONF_PATH);
        if (fun_conf != NULL) {
                fun_conf_parse(fun_conf, dev);
                free(fun_conf);
        }
}

static int isa_add_device(ddf_dev_t *dev)
{
        ddf_msg(LVL_DEBUG, "isa_add_device, device handle = %d",
            (int) dev->handle);

        /* Make the bus device more visible. Does not do anything. */
        ddf_msg(LVL_DEBUG, "Adding a 'ctl' function");

        ddf_fun_t *ctl = ddf_fun_create(dev, fun_exposed, "ctl");
        if (ctl == NULL) {
                ddf_msg(LVL_ERROR, "Failed creating control function.");
                return EXDEV;
        }

        if (ddf_fun_bind(ctl) != EOK) {
                ddf_msg(LVL_ERROR, "Failed binding control function.");
                return EXDEV;
        }

        /* Add functions as specified in the configuration file. */
        isa_functions_add(dev);
        ddf_msg(LVL_NOTE, "Finished enumerating legacy functions");

        return EOK;
}

static void isa_init() 
{
        ddf_log_init(NAME, LVL_ERROR);
        isa_fun_ops.interfaces[HW_RES_DEV_IFACE] = &isa_fun_hw_res_ops;
}

int main(int argc, char *argv[])
{
        printf(NAME ": HelenOS ISA bus driver\n");
        isa_init();
        return ddf_driver_main(&isa_driver);
}

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