blob: c3aa17f1a054f1299a809e2fd6754e55a503428c [file] [log] [blame]
/*
* sconfig, coreboot device tree compiler
*
* Copyright (C) 2010 coresystems GmbH
* written by Patrick Georgi <patrick@georgi-clan.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <ctype.h>
#include "sconfig.h"
#include "sconfig.tab.h"
extern int linenum;
/*
* Maintains list of all the unique chip structures for the board.
* This is shared across base and override device trees since we need to
* generate headers for all chips added by both the trees.
*/
static struct chip chip_header;
/*
* This is intentionally shared between chip and device structure ids because it
* is easier to track the order of parsing for chip and device.
*/
static int count = 0;
typedef enum {
UNSLASH,
SPLIT_1ST,
TO_LOWER,
TO_UPPER,
} translate_t;
/*
* Mainboard is assumed to have a root device whose bus is the parent of all the
* devices that are added by parsing the devicetree file. This device has a
* mainboard chip instance associated with it.
*
*
*
* +------------------------+ +----------------------+
* | Root device | | Mainboard |
* +---------+ (base_root_dev) +--------------->+ instance +
* | | | chip_instance | (mainboard_instance)|
* | +------------------------+ | |
* | | +----------------------+
* | | bus |
* | parent v |
* | +-------------------+ |
* | | Root bus | |
* +----------->+ (base_root_bus) | |
* | | |
* +-------------------+ |
* | |
* | children | chip
* v |
* X |
* (new devices will |
* be added here as |
* children) |
* |
* |
* |
* +-------+----------+
* | |
* | Mainboard chip +----------->X (new chips will be
* | (mainboard_chip) | added here)
* | |
* +------------------+
*
*
*/
/* Root device of primary tree. */
static struct device base_root_dev;
/* Root device of override tree (if applicable). */
static struct device override_root_dev;
static struct chip_instance mainboard_instance;
static struct bus base_root_bus = {
.id = 0,
.dev = &base_root_dev,
};
static struct device base_root_dev = {
.name = "dev_root",
.id = 0,
.chip_instance = &mainboard_instance,
.path = " .type = DEVICE_PATH_ROOT ",
.parent = &base_root_bus,
.enabled = 1,
.bus = &base_root_bus,
};
static struct bus override_root_bus = {
.id = 0,
.dev = &override_root_dev,
};
static struct device override_root_dev = {
.name = "override_root",
.id = 0,
/*
* Override tree root device points to the same mainboard chip instance
* as the base tree root device. It should not cause any side-effects
* since the mainboard chip instance pointer in override tree will just
* be ignored.
*/
.chip_instance = &mainboard_instance,
.path = " .type = DEVICE_PATH_ROOT ",
.parent = &override_root_bus,
.enabled = 1,
.bus = &override_root_bus,
};
static struct chip mainboard_chip = {
.name = "mainboard",
.name_underscore = "mainboard",
.instance = &mainboard_instance,
};
static struct chip_instance mainboard_instance = {
.id = 0,
.chip = &mainboard_chip,
.ref_count = 2,
};
/* This is the parent of all devices added by parsing the devicetree file. */
struct bus *root_parent;
struct queue_entry {
void *data;
struct queue_entry *next;
struct queue_entry *prev;
};
#define S_ALLOC(_s) s_alloc(__func__, _s)
static void *s_alloc(const char *f, size_t s)
{
void *data = calloc(1, s);
if (!data) {
fprintf(stderr, "%s: Failed to alloc mem!\n", f);
exit(1);
}
return data;
}
static struct queue_entry *new_queue_entry(void *data)
{
struct queue_entry *e = S_ALLOC(sizeof(*e));
e->data = data;
e->next = e->prev = e;
return e;
}
static void enqueue_tail(struct queue_entry **q_head, void *data)
{
struct queue_entry *tmp = new_queue_entry(data);
struct queue_entry *q = *q_head;
if (!q) {
*q_head = tmp;
return;
}
q->prev->next = tmp;
tmp->prev = q->prev;
q->prev = tmp;
tmp->next = q;
}
static void *dequeue_tail(struct queue_entry **q_head)
{
struct queue_entry *q = *q_head;
struct queue_entry *tmp;
void *data;
if (!q)
return NULL;
tmp = q->prev;
if (tmp == q)
*q_head = NULL;
else {
tmp->prev->next = q;
q->prev = tmp->prev;
}
data = tmp->data;
free(tmp);
return data;
}
static void *dequeue_head(struct queue_entry **q_head)
{
struct queue_entry *q = *q_head;
struct queue_entry *tmp = q;
void *data;
if (!q)
return NULL;
if (q->next == q)
*q_head = NULL;
else {
q->next->prev = q->prev;
q->prev->next = q->next;
*q_head = q->next;
}
data = tmp->data;
free(tmp);
return data;
}
static void *peek_queue_head(struct queue_entry *q_head)
{
if (!q_head)
return NULL;
return q_head->data;
}
static struct queue_entry *chip_q_head;
void chip_enqueue_tail(void *data)
{
enqueue_tail(&chip_q_head, data);
}
void *chip_dequeue_tail(void)
{
return dequeue_tail(&chip_q_head);
}
int yywrap(void)
{
return 1;
}
void yyerror(char const *str)
{
extern char *yytext;
fprintf(stderr, "line %d: %s: %s\n", linenum + 1, yytext, str);
exit(1);
}
char *translate_name(const char *str, translate_t mode)
{
char *b, *c;
b = c = strdup(str);
while (c && *c) {
if ((mode == SPLIT_1ST) && (*c == '/')) {
*c = 0;
break;
}
if (*c == '/')
*c = '_';
if (*c == '-')
*c = '_';
if (mode == TO_UPPER)
*c = toupper(*c);
if (mode == TO_LOWER)
*c = tolower(*c);
c++;
}
return b;
}
static struct chip *get_chip(char *path)
{
struct chip *h = &chip_header;
while (h->next) {
int result = strcmp(path, h->next->name);
if (result == 0)
return h->next;
if (result < 0)
break;
h = h->next;
}
struct chip *new_chip = S_ALLOC(sizeof(struct chip));
new_chip->next = h->next;
h->next = new_chip;
new_chip->chiph_exists = 1;
new_chip->name = path;
new_chip->name_underscore = translate_name(path, UNSLASH);
struct stat st;
char *chip_h = S_ALLOC(strlen(path) + 18);
sprintf(chip_h, "src/%s", path);
if ((stat(chip_h, &st) == -1) && (errno == ENOENT)) {
/* root_complex gets away without a separate directory, but
* exists on on pretty much all AMD chipsets.
*/
if (!strstr(path, "/root_complex")) {
fprintf(stderr, "ERROR: Chip component %s does not exist.\n",
path);
exit(1);
}
}
sprintf(chip_h, "src/%s/chip.h", path);
if ((stat(chip_h, &st) == -1) && (errno == ENOENT))
new_chip->chiph_exists = 0;
free(chip_h);
return new_chip;
}
struct chip_instance *new_chip_instance(char *path)
{
struct chip *chip = get_chip(path);
struct chip_instance *instance = S_ALLOC(sizeof(*instance));
instance->id = ++count;
instance->chip = chip;
instance->next = chip->instance;
chip->instance = instance;
return instance;
}
static void delete_chip_instance(struct chip_instance *ins)
{
if (ins->ref_count == 0) {
printf("ERROR: ref count for chip instance is zero!!\n");
exit(1);
}
if (--ins->ref_count)
return;
struct chip *c = ins->chip;
/* Get pointer to first instance of the chip. */
struct chip_instance *i = c->instance;
/*
* If chip instance to be deleted is the first instance, then update
* instance pointer of the chip as well.
*/
if (i == ins) {
c->instance = ins->next;
free(ins);
return;
}
/*
* Loop through the instances list of the chip to find and remove the
* given instance.
*/
while (1) {
if (i == NULL) {
printf("ERROR: chip instance not found!\n");
exit(1);
}
if (i->next != ins) {
i = i->next;
continue;
}
i->next = ins->next;
break;
}
free(ins);
}
/*
* Allocate a new bus for the provided device.
* - If this is the first bus being allocated under this device, then its id
* is set to 0 and bus and last_bus are pointed to the newly allocated bus.
* - If this is not the first bus under this device, then its id is set to 1
* plus the id of last bus and newly allocated bus is added to the list of
* buses under the device. last_bus is updated to point to the newly
* allocated bus.
*/
static void alloc_bus(struct device *dev)
{
struct bus *bus = S_ALLOC(sizeof(*bus));
bus->dev = dev;
if (dev->last_bus == NULL) {
bus->id = 0;
dev->bus = bus;
} else {
bus->id = dev->last_bus->id + 1;
dev->last_bus->next_bus = bus;
}
dev->last_bus = bus;
}
/*
* Allocate a new device under the given parent. This function allocates a new
* device structure under the provided parent bus and allocates a bus structure
* under the newly allocated device.
*/
static struct device *alloc_dev(struct bus *parent)
{
struct device *dev = S_ALLOC(sizeof(*dev));
dev->id = ++count;
dev->parent = parent;
dev->subsystem_vendor = -1;
dev->subsystem_device = -1;
alloc_bus(dev);
return dev;
}
/*
* This function scans the children of given bus to see if any device matches
* the new device that is requested.
*
* Returns pointer to the node if found, else NULL.
*/
static struct device *get_dev(struct bus *parent, int path_a, int path_b,
int bustype, struct chip_instance *chip_instance)
{
struct device *child = parent->children;
while (child) {
if ((child->path_a == path_a) && (child->path_b == path_b) &&
(child->bustype == bustype) &&
(child->chip_instance == chip_instance))
return child;
child = child->sibling;
}
return NULL;
}
/*
* Add given node as child of the provided parent. If this is the first child of
* the parent, update parent->children pointer as well.
*/
static void set_new_child(struct bus *parent, struct device *child)
{
struct device *c = parent->children;
if (c) {
while (c->sibling)
c = c->sibling;
c->sibling = child;
} else
parent->children = child;
child->sibling = NULL;
child->parent = parent;
}
struct device *new_device(struct bus *parent,
struct chip_instance *chip_instance,
const int bustype, const char *devnum,
int status)
{
char *tmp;
int path_a;
int path_b = 0;
struct device *new_d;
path_a = strtol(devnum, &tmp, 16);
if (*tmp == '.') {
tmp++;
path_b = strtol(tmp, NULL, 16);
}
/* If device is found under parent, no need to allocate new device. */
new_d = get_dev(parent, path_a, path_b, bustype, chip_instance);
if (new_d) {
alloc_bus(new_d);
return new_d;
}
new_d = alloc_dev(parent);
new_d->bustype = bustype;
new_d->path_a = path_a;
new_d->path_b = path_b;
char *name = S_ALLOC(10);
sprintf(name, "_dev%d", new_d->id);
new_d->name = name;
new_d->enabled = status & 0x01;
new_d->hidden = (status >> 1) & 0x01;
new_d->chip_instance = chip_instance;
chip_instance->ref_count++;
set_new_child(parent, new_d);
switch (bustype) {
case PCI:
new_d->path = ".type=DEVICE_PATH_PCI,{.pci={ .devfn = PCI_DEVFN(0x%x,%d)}}";
break;
case PNP:
new_d->path = ".type=DEVICE_PATH_PNP,{.pnp={ .port = 0x%x, .device = 0x%x }}";
break;
case I2C:
new_d->path = ".type=DEVICE_PATH_I2C,{.i2c={ .device = 0x%x, .mode_10bit = %d }}";
break;
case APIC:
new_d->path = ".type=DEVICE_PATH_APIC,{.apic={ .apic_id = 0x%x }}";
break;
case CPU_CLUSTER:
new_d->path = ".type=DEVICE_PATH_CPU_CLUSTER,{.cpu_cluster={ .cluster = 0x%x }}";
break;
case CPU:
new_d->path = ".type=DEVICE_PATH_CPU,{.cpu={ .id = 0x%x }}";
break;
case DOMAIN:
new_d->path = ".type=DEVICE_PATH_DOMAIN,{.domain={ .domain = 0x%x }}";
break;
case IOAPIC:
new_d->path = ".type=DEVICE_PATH_IOAPIC,{.ioapic={ .ioapic_id = 0x%x }}";
break;
case GENERIC:
new_d->path = ".type=DEVICE_PATH_GENERIC,{.generic={ .id = 0x%x, .subid = 0x%x }}";
break;
case SPI:
new_d->path = ".type=DEVICE_PATH_SPI,{.spi={ .cs = 0x%x }}";
break;
case USB:
new_d->path = ".type=DEVICE_PATH_USB,{.usb={ .port_type = %d, .port_id = %d }}";
break;
case MMIO:
new_d->path = ".type=DEVICE_PATH_MMIO,{.mmio={ .addr = 0x%x }}";
break;
}
return new_d;
}
static void new_resource(struct device *dev, int type, int index, int base)
{
struct resource *r = S_ALLOC(sizeof(struct resource));
r->type = type;
r->index = index;
r->base = base;
if (dev->res) {
struct resource *head = dev->res;
while (head->next)
head = head->next;
head->next = r;
} else {
dev->res = r;
}
}
void add_resource(struct bus *bus, int type, int index, int base)
{
new_resource(bus->dev, type, index, base);
}
void add_register(struct chip_instance *chip_instance, char *name, char *val)
{
struct reg *r = S_ALLOC(sizeof(struct reg));
r->key = name;
r->value = val;
if (chip_instance->reg) {
struct reg *head = chip_instance->reg;
// sorting to be equal to sconfig's behaviour
int sort = strcmp(r->key, head->key);
if (sort == 0) {
printf("ERROR: duplicate 'register' key.\n");
exit(1);
}
if (sort < 0) {
r->next = head;
chip_instance->reg = r;
} else {
while ((head->next)
&& (strcmp(head->next->key, r->key) < 0))
head = head->next;
r->next = head->next;
head->next = r;
}
} else {
chip_instance->reg = r;
}
}
void add_slot_desc(struct bus *bus, char *type, char *length, char *designation,
char *data_width)
{
struct device *dev = bus->dev;
if (dev->bustype != PCI && dev->bustype != DOMAIN) {
printf("ERROR: 'slot_type' only allowed for PCI devices\n");
exit(1);
}
dev->smbios_slot_type = type;
dev->smbios_slot_length = length;
dev->smbios_slot_data_width = data_width;
dev->smbios_slot_designation = designation;
}
void add_pci_subsystem_ids(struct bus *bus, int vendor, int device,
int inherit)
{
struct device *dev = bus->dev;
if (dev->bustype != PCI && dev->bustype != DOMAIN) {
printf("ERROR: 'subsystem' only allowed for PCI devices\n");
exit(1);
}
dev->subsystem_vendor = vendor;
dev->subsystem_device = device;
dev->inherit_subsystem = inherit;
}
void add_ioapic_info(struct bus *bus, int apicid, const char *_srcpin,
int irqpin)
{
int srcpin;
struct device *dev = bus->dev;
if (!_srcpin || strlen(_srcpin) < 4 || strncasecmp(_srcpin, "INT", 3) ||
_srcpin[3] < 'A' || _srcpin[3] > 'D') {
printf("ERROR: malformed ioapic_irq args: %s\n", _srcpin);
exit(1);
}
srcpin = _srcpin[3] - 'A';
if (dev->bustype != PCI && dev->bustype != DOMAIN) {
printf("ERROR: ioapic config only allowed for PCI devices\n");
exit(1);
}
if (srcpin > 3) {
printf("ERROR: srcpin '%d' invalid\n", srcpin);
exit(1);
}
dev->pci_irq_info[srcpin].ioapic_irq_pin = irqpin;
dev->pci_irq_info[srcpin].ioapic_dst_id = apicid;
}
static int dev_has_children(struct device *dev)
{
struct bus *bus = dev->bus;
while (bus) {
if (bus->children)
return 1;
bus = bus->next_bus;
}
return 0;
}
static void pass0(FILE *fil, struct device *ptr, struct device *next)
{
if (ptr == &base_root_dev) {
fprintf(fil, "DEVTREE_CONST struct bus %s_links[];\n",
ptr->name);
return;
}
fprintf(fil, "DEVTREE_CONST static struct device %s;\n", ptr->name);
if (ptr->res)
fprintf(fil, "DEVTREE_CONST struct resource %s_res[];\n",
ptr->name);
if (dev_has_children(ptr))
fprintf(fil, "DEVTREE_CONST struct bus %s_links[];\n",
ptr->name);
if (next)
return;
fprintf(fil,
"DEVTREE_CONST struct device * DEVTREE_CONST last_dev = &%s;\n",
ptr->name);
}
static void emit_resources(FILE *fil, struct device *ptr)
{
if (ptr->res == NULL)
return;
int i = 1;
fprintf(fil, "DEVTREE_CONST struct resource %s_res[] = {\n", ptr->name);
struct resource *r = ptr->res;
while (r) {
fprintf(fil,
"\t\t{ .flags=IORESOURCE_FIXED | IORESOURCE_ASSIGNED | IORESOURCE_");
if (r->type == IRQ)
fprintf(fil, "IRQ");
if (r->type == DRQ)
fprintf(fil, "DRQ");
if (r->type == IO)
fprintf(fil, "IO");
fprintf(fil, ", .index=0x%x, .base=0x%x,", r->index,
r->base);
if (r->next)
fprintf(fil, ".next=&%s_res[%d]},\n", ptr->name,
i++);
else
fprintf(fil, ".next=NULL },\n");
r = r->next;
}
fprintf(fil, "\t };\n");
}
static void emit_bus(FILE *fil, struct bus *bus)
{
fprintf(fil, "\t\t[%d] = {\n", bus->id);
fprintf(fil, "\t\t\t.link_num = %d,\n", bus->id);
fprintf(fil, "\t\t\t.dev = &%s,\n", bus->dev->name);
if (bus->children)
fprintf(fil, "\t\t\t.children = &%s,\n", bus->children->name);
if (bus->next_bus)
fprintf(fil, "\t\t\t.next=&%s_links[%d],\n", bus->dev->name,
bus->id + 1);
else
fprintf(fil, "\t\t\t.next = NULL,\n");
fprintf(fil, "\t\t},\n");
}
static void emit_dev_links(FILE *fil, struct device *ptr)
{
fprintf(fil, "DEVTREE_CONST struct bus %s_links[] = {\n",
ptr->name);
struct bus *bus = ptr->bus;
while (bus) {
emit_bus(fil, bus);
bus = bus->next_bus;
}
fprintf(fil, "\t};\n");
}
static void pass1(FILE *fil, struct device *ptr, struct device *next)
{
int pin;
struct chip_instance *chip_ins = ptr->chip_instance;
int has_children = dev_has_children(ptr);
if (ptr != &base_root_dev)
fprintf(fil, "static ");
fprintf(fil, "DEVTREE_CONST struct device %s = {\n", ptr->name);
fprintf(fil, "#if !DEVTREE_EARLY\n");
/*
* ops field is set to default_dev_ops_root only for the root
* device. For all other devices, it is set by the driver at runtime.
*/
if (ptr == &base_root_dev)
fprintf(fil, "\t.ops = &default_dev_ops_root,\n");
else
fprintf(fil, "\t.ops = NULL,\n");
fprintf(fil, "#endif\n");
fprintf(fil, "\t.bus = &%s_links[%d],\n", ptr->parent->dev->name,
ptr->parent->id);
fprintf(fil, "\t.path = {");
fprintf(fil, ptr->path, ptr->path_a, ptr->path_b);
fprintf(fil, "},\n");
fprintf(fil, "\t.enabled = %d,\n", ptr->enabled);
fprintf(fil, "\t.hidden = %d,\n", ptr->hidden);
fprintf(fil, "\t.on_mainboard = 1,\n");
if (ptr->subsystem_vendor > 0)
fprintf(fil, "\t.subsystem_vendor = 0x%04x,\n",
ptr->subsystem_vendor);
for (pin = 0; pin < 4; pin++) {
if (ptr->pci_irq_info[pin].ioapic_irq_pin > 0)
fprintf(fil,
"\t.pci_irq_info[%d].ioapic_irq_pin = %d,\n",
pin, ptr->pci_irq_info[pin].ioapic_irq_pin);
if (ptr->pci_irq_info[pin].ioapic_dst_id > 0)
fprintf(fil,
"\t.pci_irq_info[%d].ioapic_dst_id = %d,\n",
pin, ptr->pci_irq_info[pin].ioapic_dst_id);
}
if (ptr->subsystem_device > 0)
fprintf(fil, "\t.subsystem_device = 0x%04x,\n",
ptr->subsystem_device);
if (ptr->res) {
fprintf(fil, "\t.resource_list = &%s_res[0],\n",
ptr->name);
}
if (has_children)
fprintf(fil, "\t.link_list = &%s_links[0],\n",
ptr->name);
else
fprintf(fil, "\t.link_list = NULL,\n");
if (ptr->sibling)
fprintf(fil, "\t.sibling = &%s,\n", ptr->sibling->name);
fprintf(fil, "#if !DEVTREE_EARLY\n");
fprintf(fil, "\t.chip_ops = &%s_ops,\n",
chip_ins->chip->name_underscore);
if (chip_ins == &mainboard_instance)
fprintf(fil, "\t.name = mainboard_name,\n");
fprintf(fil, "#endif\n");
if (chip_ins->chip->chiph_exists)
fprintf(fil, "\t.chip_info = &%s_info_%d,\n",
chip_ins->chip->name_underscore, chip_ins->id);
if (next)
fprintf(fil, "\t.next=&%s,\n", next->name);
if (ptr->smbios_slot_type || ptr->smbios_slot_data_width ||
ptr->smbios_slot_designation || ptr->smbios_slot_length) {
fprintf(fil, "#if !DEVTREE_EARLY\n");
fprintf(fil, "#if CONFIG(GENERATE_SMBIOS_TABLES)\n");
}
/* SMBIOS types start at 1, if zero it hasn't been set */
if (ptr->smbios_slot_type)
fprintf(fil, "\t.smbios_slot_type = %s,\n",
ptr->smbios_slot_type);
if (ptr->smbios_slot_data_width)
fprintf(fil, "\t.smbios_slot_data_width = %s,\n",
ptr->smbios_slot_data_width);
if (ptr->smbios_slot_designation)
fprintf(fil, "\t.smbios_slot_designation = \"%s\",\n",
ptr->smbios_slot_designation);
if (ptr->smbios_slot_length)
fprintf(fil, "\t.smbios_slot_length = %s,\n",
ptr->smbios_slot_length);
if (ptr->smbios_slot_type || ptr->smbios_slot_data_width ||
ptr->smbios_slot_designation || ptr->smbios_slot_length) {
fprintf(fil, "#endif\n");
fprintf(fil, "#endif\n");
}
fprintf(fil, "};\n");
emit_resources(fil, ptr);
if (has_children)
emit_dev_links(fil, ptr);
}
static void add_siblings_to_queue(struct queue_entry **bfs_q_head,
struct device *d)
{
while (d) {
enqueue_tail(bfs_q_head, d);
d = d->sibling;
}
}
static void add_children_to_queue(struct queue_entry **bfs_q_head,
struct device *d)
{
struct bus *bus = d->bus;
while (bus) {
if (bus->children)
add_siblings_to_queue(bfs_q_head, bus->children);
bus = bus->next_bus;
}
}
static void walk_device_tree(FILE *fil, struct device *ptr,
void (*func)(FILE *, struct device *,
struct device *))
{
struct queue_entry *bfs_q_head = NULL;
enqueue_tail(&bfs_q_head, ptr);
while ((ptr = dequeue_head(&bfs_q_head))) {
add_children_to_queue(&bfs_q_head, ptr);
func(fil, ptr, peek_queue_head(bfs_q_head));
}
}
static void emit_chip_headers(FILE *fil, struct chip *chip)
{
struct chip *tmp = chip;
fprintf(fil, "#include <device/device.h>\n");
fprintf(fil, "#include <device/pci.h>\n");
while (chip) {
if (chip->chiph_exists)
fprintf(fil, "#include \"%s/chip.h\"\n", chip->name);
chip = chip->next;
}
fprintf(fil, "\n#if !DEVTREE_EARLY\n");
fprintf(fil,
"__attribute__((weak)) struct chip_operations mainboard_ops = {};\n");
chip = tmp;
while (chip) {
fprintf(fil,
"__attribute__((weak)) struct chip_operations %s_ops = {};\n",
chip->name_underscore);
chip = chip->next;
}
fprintf(fil, "#endif\n");
}
static void emit_chip_instance(FILE *fil, struct chip_instance *instance)
{
fprintf(fil, "DEVTREE_CONST struct %s_config %s_info_%d = {",
instance->chip->name_underscore,
instance->chip->name_underscore,
instance->id);
if (instance->reg) {
fprintf(fil, "\n");
struct reg *r = instance->reg;
while (r) {
fprintf(fil, "\t.%s = %s,\n", r->key, r->value);
r = r->next;
}
}
fprintf(fil, "};\n\n");
}
static void emit_chips(FILE *fil)
{
struct chip *chip = chip_header.next;
struct chip_instance *instance;
emit_chip_headers(fil, chip);
for (; chip; chip = chip->next) {
if (!chip->chiph_exists)
continue;
instance = chip->instance;
while (instance) {
emit_chip_instance(fil, instance);
instance = instance->next;
}
}
}
static void inherit_subsystem_ids(FILE *file, struct device *dev,
struct device *next)
{
struct device *p;
if (dev->subsystem_vendor != -1 && dev->subsystem_device != -1) {
/* user already gave us a subsystem vendor/device */
return;
}
for (p = dev; p && p->parent->dev != p; p = p->parent->dev) {
if (p->bustype != PCI && p->bustype != DOMAIN)
continue;
if (p->inherit_subsystem) {
dev->subsystem_vendor = p->subsystem_vendor;
dev->subsystem_device = p->subsystem_device;
break;
}
}
}
static void usage(void)
{
printf("usage: sconfig devicetree_file output_file [override_devicetree_file]\n");
exit(1);
}
enum {
DEVICEFILE_ARG = 1,
OUTPUTFILE_ARG,
OVERRIDE_DEVICEFILE_ARG,
};
#define MANDATORY_ARG_COUNT 3
#define OPTIONAL_ARG_COUNT 1
#define TOTAL_ARG_COUNT (MANDATORY_ARG_COUNT + OPTIONAL_ARG_COUNT)
static void parse_devicetree(const char *file, struct bus *parent)
{
FILE *filec = fopen(file, "r");
if (!filec) {
perror(NULL);
exit(1);
}
yyrestart(filec);
root_parent = parent;
linenum = 0;
yyparse();
fclose(filec);
}
/*
* Match device nodes from base and override tree to see if they are the same
* node.
*/
static int device_match(struct device *a, struct device *b)
{
return ((a->path_a == b->path_a) &&
(a->path_b == b->path_b) &&
(a->bustype == b->bustype) &&
(a->chip_instance->chip ==
b->chip_instance->chip));
}
/*
* Walk through the override subtree in breadth-first manner starting at node to
* see if chip_instance pointer of the node is same as chip_instance pointer of
* override parent that is passed into the function. If yes, then update the
* chip_instance pointer of the node to chip_instance pointer of the base
* parent.
*/
static void update_chip_pointers(struct device *node,
struct chip_instance *base_parent_ci,
struct chip_instance *override_parent_ci)
{
struct queue_entry *q_head = NULL;
enqueue_tail(&q_head, node);
while ((node = dequeue_head(&q_head))) {
if (node->chip_instance != override_parent_ci)
continue;
node->chip_instance = base_parent_ci;
add_children_to_queue(&q_head, node);
}
}
/*
* Add resource to device. If resource is already present, then update its base
* and index. If not, then add a new resource to the device.
*/
static void update_resource(struct device *dev, struct resource *res)
{
struct resource *base_res = dev->res;
while (base_res) {
if (base_res->type == res->type) {
base_res->index = res->index;
base_res->base = res->base;
return;
}
base_res = base_res->next;
}
new_resource(dev, res->type, res->index, res->base);
}
/*
* Add register to chip instance. If register is already present, then update
* its value. If not, then add a new register to the chip instance.
*/
static void update_register(struct chip_instance *c, struct reg *reg)
{
struct reg *base_reg = c->reg;
while (base_reg) {
if (!strcmp(base_reg->key, reg->key)) {
base_reg->value = reg->value;
return;
}
base_reg = base_reg->next;
}
add_register(c, reg->key, reg->value);
}
static void override_devicetree(struct bus *base_parent,
struct bus *override_parent);
/*
* Update the base device properties using the properties of override device. In
* addition to that, call override_devicetree for all the buses under the
* override device.
*
* Override Rules:
* +--------------------+--------------------------------------------+
* | | |
* |struct device member| Rule |
* | | |
* +-----------------------------------------------------------------+
* | | |
* | id | Unchanged. This is used to generate device |
* | | structure name in static.c. So, no need to |
* | | override. |
* | | |
* +-----------------------------------------------------------------+
* | | |
* | enabled | Copy enabled state from override device. |
* | | This allows variants to override device |
* | | state. |
* | | |
* +-----------------------------------------------------------------+
* | | |
* | subsystem_vendor | Copy from override device only if any one |
* | subsystem_device | of the ids is non-zero. |
* | | |
* +-----------------------------------------------------------------+
* | | |
* | inherit_subsystem | Copy from override device only if it is |
* | | non-zero. This allows variant to only |
* | | enable inherit flag for a device. |
* | | |
* +-----------------------------------------------------------------+
* | | |
* | path | Unchanged since these are same for both |
* | path_a | base and override device (Used for |
* | path_b | matching devices). |
* | | |
* +-----------------------------------------------------------------+
* | | |
* | bustype | Unchanged since this is same for both base |
* | | and override device (User for matching |
* | | devices). |
* | | |
* +-----------------------------------------------------------------+
* | | |
* | pci_irq_info | Unchanged. |
* | | |
* +-----------------------------------------------------------------+
* | | |
* | parent | Unchanged. This is meaningful only within |
* | sibling | the parse tree, hence not being copied. |
* | | |
* +-----------------------------------------------------------------+
* | | |
* | res | Each resource that is present in override |
* | | device is copied over to base device: |
* | | 1. If resource of same type is present in |
* | | base device, then index and base of the |
* | | resource is copied. |
* | | 2. If not, then a new resource is allocated|
* | | under the base device using type, index |
* | | and base from override res. |
* | | |
* +-----------------------------------------------------------------+
* | | |
* | chip_instance | Each register of chip_instance is copied |
* | | over from override device to base device: |
* | | 1. If register with same key is present in |
* | | base device, then value of the register |
* | | is copied. |
* | | 2. If not, then a new register is allocated|
* | | under the base chip_instance using key |
* | | and value from override register. |
* | | |
* +-----------------------------------------------------------------+
* | | |
* | bus | Recursively call override_devicetree on |
* | last_bus | each bus of override device. It is assumed |
* | | that bus with id X under base device |
* | | to bus with id X under override device. If |
* | | override device has more buses than base |
* | | device, then new buses are allocated under |
* | | base device. |
* | | |
* +-----------------------------------------------------------------+
*/
static void update_device(struct device *base_dev, struct device *override_dev)
{
/*
* Copy the enabled state of override device to base device. This allows
* override tree to enable or disable a particular device.
*/
base_dev->enabled = override_dev->enabled;
/*
* Copy subsystem vendor and device ids from override device to base
* device only if the ids are non-zero in override device. Else, honor
* the values in base device.
*/
if (override_dev->subsystem_vendor ||
override_dev->subsystem_device) {
base_dev->subsystem_vendor = override_dev->subsystem_vendor;
base_dev->subsystem_device = override_dev->subsystem_device;
}
/*
* Copy value of inherity_subsystem from override device to base device
* only if it is non-zero in override device. This allows override
* tree to only enable inhert flag for a device.
*/
if (override_dev->inherit_subsystem)
base_dev->inherit_subsystem = override_dev->inherit_subsystem;
/*
* Copy resources of override device to base device.
* 1. If resource is already present in base device, then index and base
* of the resource will be copied over.
* 2. If resource is not already present in base device, a new resource
* will be allocated.
*/
struct resource *res = override_dev->res;
while (res) {
update_resource(base_dev, res);
res = res->next;
}
/*
* Copy registers of override chip instance to base chip instance.
* 1. If register key is already present in base chip instance, then
* value for the register is copied over.
* 2. If register key is not already present in base chip instance, then
* a new register will be allocated.
*/
struct reg *reg = override_dev->chip_instance->reg;
while (reg) {
update_register(base_dev->chip_instance, reg);
reg = reg->next;
}
/*
* Now that the device properties are all copied over, look at each bus
* of the override device and run override_devicetree in a recursive
* manner. The assumption here is that first bus of override device
* corresponds to first bus of base device and so on. If base device has
* lesser buses than override tree, then new buses are allocated for it.
*/
struct bus *override_bus = override_dev->bus;
struct bus *base_bus = base_dev->bus;
while (override_bus) {
/*
* If we have more buses in override tree device, then allocate
* a new bus for the base tree device as well.
*/
if (!base_bus) {
alloc_bus(base_dev);
base_bus = base_dev->last_bus;
}
override_devicetree(base_dev->bus, override_dev->bus);
override_bus = override_bus->next_bus;
base_bus = base_bus->next_bus;
}
delete_chip_instance(override_dev->chip_instance);
override_dev->chip_instance = NULL;
}
/*
* Perform copy of device and properties from override parent to base parent.
* This function walks through the override tree in a depth-first manner
* performing following actions:
* 1. If matching device is found in base tree, then copy the properties of
* override device to base tree device. Call override_devicetree recursively on
* the bus of override device.
* 2. If matching device is not found in base tree, then set override tree
* device as new child of base_parent and update the chip pointers in override
* device subtree to ensure the nodes do not point to override tree chip
* instance.
*/
static void override_devicetree(struct bus *base_parent,
struct bus *override_parent)
{
struct device *base_child;
struct device *override_child = override_parent->children;
struct device *next_child;
while (override_child) {
/* Look for a matching device in base tree. */
for (base_child = base_parent->children;
base_child; base_child = base_child->sibling) {
if (device_match(base_child, override_child))
break;
}
next_child = override_child->sibling;
/*
* If matching device is found, copy properties of
* override_child to base_child.
*/
if (base_child)
update_device(base_child, override_child);
else {
/*
* If matching device is not found, set override_child
* as a new child of base_parent.
*/
set_new_child(base_parent, override_child);
/*
* Ensure all nodes in override tree pointing to
* override parent chip_instance now point to base
* parent chip_instance.
*/
update_chip_pointers(override_child,
base_parent->dev->chip_instance,
override_parent->dev->chip_instance);
}
override_child = next_child;
}
}
int main(int argc, char **argv)
{
if ((argc < MANDATORY_ARG_COUNT) || (argc > TOTAL_ARG_COUNT))
usage();
const char *base_devtree = argv[DEVICEFILE_ARG];
const char *outputc = argv[OUTPUTFILE_ARG];
const char *override_devtree;
parse_devicetree(base_devtree, &base_root_bus);
if (argc == TOTAL_ARG_COUNT) {
override_devtree = argv[OVERRIDE_DEVICEFILE_ARG];
parse_devicetree(override_devtree, &override_root_bus);
if (!dev_has_children(&override_root_dev)) {
fprintf(stderr, "ERROR: Override tree needs at least one device!\n");
exit(1);
}
override_devicetree(&base_root_bus, &override_root_bus);
}
FILE *autogen = fopen(outputc, "w");
if (!autogen) {
fprintf(stderr, "Could not open file '%s' for writing: ",
outputc);
perror(NULL);
exit(1);
}
emit_chips(autogen);
walk_device_tree(autogen, &base_root_dev, inherit_subsystem_ids);
fprintf(autogen, "\n/* pass 0 */\n");
walk_device_tree(autogen, &base_root_dev, pass0);
fprintf(autogen, "\n/* pass 1 */\n");
walk_device_tree(autogen, &base_root_dev, pass1);
fclose(autogen);
return 0;
}