switch-coreboot/device/pnp_device.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2004 Linux Networx
 * (Written by Eric Biederman <ebiederman@lnxi.com> for Linux Networx)
 * Copyright (C) 2004 Li-Ta Lo <ollie@lanl.gov>
 * Copyright (C) 2005 Tyan
 * (Written by Yinghai Lu <yhlu@tyan.com> for Tyan)
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include <types.h>
#include <console.h>
#include <string.h>
#include <io.h>
#include <device/device.h>
#include <device/pnp.h>

/* PNP fundamental operations: */

void pnp_write_config(struct device *dev, u8 reg, u8 value)
{
	outb(reg, dev->path.pnp.port);
	outb(value, dev->path.pnp.port + 1);
}

u8 pnp_read_config(struct device *dev, u8 reg)
{
	outb(reg, dev->path.pnp.port);
	return inb(dev->path.pnp.port + 1);
}

void pnp_set_logical_device(struct device *dev)
{
	pnp_write_config(dev, 0x07, dev->path.pnp.device);
}

void pnp_set_enable(struct device *dev, int enable)
{
	pnp_write_config(dev, 0x30, enable ? 0x1 : 0x0);
}

int pnp_read_enable(struct device *dev)
{
	return !!pnp_read_config(dev, 0x30);
}

void pnp_set_iobase(struct device *dev, unsigned int index, unsigned int iobase)
{
	/* Index == 0x60 or 0x62 */
	pnp_write_config(dev, index + 0, (iobase >> 8) & 0xff);
	pnp_write_config(dev, index + 1, iobase & 0xff);
}

void pnp_set_irq(struct device *dev, unsigned int index, unsigned int irq)
{
	/* Index == 0x70 or 0x72 */
	pnp_write_config(dev, index, irq);
}

void pnp_set_drq(struct device *dev, unsigned int index, unsigned int drq)
{
	/* Index == 0x74 */
	pnp_write_config(dev, index, drq & 0xff);
}

/* PNP device operations: */

void pnp_read_resources(struct device *dev)
{
	return;
}

static void pnp_set_resource(struct device *dev, struct resource *resource)
{
	if (!(resource->flags & IORESOURCE_ASSIGNED)) {
		printk(BIOS_ERR,
		       "ERROR: %s %02lx %s size: 0x%010llx not assigned\n",
		       dev_path(dev), resource->index, resource_type(resource),
		       resource->size);
		return;
	}

	/* Now store the resource. */
	if (resource->flags & IORESOURCE_IO) {
		pnp_set_iobase(dev, resource->index, resource->base);
	} else if (resource->flags & IORESOURCE_DRQ) {
		pnp_set_drq(dev, resource->index, resource->base);
	} else if (resource->flags & IORESOURCE_IRQ) {
		pnp_set_irq(dev, resource->index, resource->base);
	} else {
		printk(BIOS_ERR, "ERROR: %s %02lx unknown resource type\n",
		       dev_path(dev), resource->index);
		return;
	}
	resource->flags |= IORESOURCE_STORED;

	report_resource_stored(dev, resource, "");
}

void pnp_set_resources(struct device *dev)
{
	int i;

	/* Select the device. */
	pnp_set_logical_device(dev);

	/* Paranoia says I should disable the device here... */
	for (i = 0; i < dev->resources; i++) {
		pnp_set_resource(dev, &dev->resource[i]);
	}
}

void pnp_enable_resources(struct device *dev)
{
	pnp_set_logical_device(dev);
	pnp_set_enable(dev, 1);
}

void pnp_enable(struct device *dev)
{
	if (!dev->enabled) {
		pnp_set_logical_device(dev);
		pnp_set_enable(dev, 0);
	}
}

struct device_operations pnp_ops = {
	.phase4_read_resources   = pnp_read_resources,
	.phase4_set_resources    = pnp_set_resources,
	.phase5_enable_resources = pnp_enable_resources,
	// .enable               = pnp_enable,
	// FIXME
};

/* PNP chip operations: */

static void pnp_get_ioresource(struct device *dev, unsigned int index,
			       struct io_info *info)
{
	struct resource *resource;
	unsigned int moving, gran, step;

	resource = new_resource(dev, index);

	/* Initialize the resource. */
	resource->limit = 0xffff;
	resource->flags |= IORESOURCE_IO;

	/* Get the resource size. */
	moving = info->mask;
	gran = 15;
	step = 1 << gran;

	/* Find the first bit that moves. */
	while ((moving & step) == 0) {
		gran--;
		step >>= 1;
	}

	/* Now find the first bit that does not move. */
	while ((moving & step) != 0) {
		gran--;
		step >>= 1;
	}

	/* Of the moving bits the last bit in the first group,
	 * tells us the size of this resource.
	 */
	if ((moving & step) == 0) {
		gran++;
		step <<= 1;
	}

	/* Set the resource size and alignment. */
	resource->gran = gran;
	resource->align = gran;
	resource->limit = info->mask | (step - 1);
	resource->size = 1 << gran;
}

static void get_resources(struct device *dev, struct pnp_info *info)
{
	struct resource *resource;

	if (info->flags & PNP_IO0) {
		pnp_get_ioresource(dev, PNP_IDX_IO0, &info->io0);
	}
	if (info->flags & PNP_IO1) {
		pnp_get_ioresource(dev, PNP_IDX_IO1, &info->io1);
	}
	if (info->flags & PNP_IO2) {
		pnp_get_ioresource(dev, PNP_IDX_IO2, &info->io2);
	}
	if (info->flags & PNP_IO3) {
		pnp_get_ioresource(dev, PNP_IDX_IO3, &info->io3);
	}
	if (info->flags & PNP_IRQ0) {
		resource = new_resource(dev, PNP_IDX_IRQ0);
		resource->size = 1;
		resource->flags |= IORESOURCE_IRQ;
	}
	if (info->flags & PNP_IRQ1) {
		resource = new_resource(dev, PNP_IDX_IRQ1);
		resource->size = 1;
		resource->flags |= IORESOURCE_IRQ;
	}
	if (info->flags & PNP_DRQ0) {
		resource = new_resource(dev, PNP_IDX_DRQ0);
		resource->size = 1;
		resource->flags |= IORESOURCE_DRQ;
	}
	if (info->flags & PNP_DRQ1) {
		resource = new_resource(dev, PNP_IDX_DRQ1);
		resource->size = 1;
		resource->flags |= IORESOURCE_DRQ;
	}
}

void pnp_enable_devices(struct device *base_dev, struct device_operations *ops,
			unsigned int functions, struct pnp_info *info)
{
	struct device_path path;
	struct device_id id = {.type = DEVICE_ID_PNP };
	struct device *dev;
	int i;

	path.type = DEVICE_PATH_PNP;
	path.pnp.port = base_dev->path.pnp.port;

	/* Setup the ops and resources on the newly allocated devices. */
	for (i = 0; i < functions; i++) {
		path.pnp.device = info[i].function;
		dev = alloc_find_dev(base_dev->bus, &path, &id);

		/* Don't initialize a device multiple times. */
		if (dev->ops)
			continue;

		if (info[i].ops == 0) {
			dev->ops = ops;
		} else {
			dev->ops = info[i].ops;
		}
		get_resources(dev, &info[i]);
	}
}