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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* This file is part of the coreboot project. */
/* RAM-based driver for SMSC LPC47N217 Super I/O chip. */
#include <arch/io.h>
#include <device/device.h>
#include <device/pnp.h>
#include <console/console.h>
#include <assert.h>
#include "lpc47n217.h"
/* Forward declarations */
static void enable_dev(struct device *dev);
static void lpc47n217_pnp_set_resources(struct device *dev);
static void lpc47n217_pnp_enable_resources(struct device *dev);
static void lpc47n217_pnp_enable(struct device *dev);
static void lpc47n217_init(struct device *dev);
static void lpc47n217_pnp_set_resource(struct device *dev, struct resource *resource);
static void lpc47n217_pnp_set_iobase(struct device *dev, u16 iobase);
static void lpc47n217_pnp_set_drq(struct device *dev, u8 drq);
static void lpc47n217_pnp_set_irq(struct device *dev, u8 irq);
static void lpc47n217_pnp_set_enable(struct device *dev, int enable);
static void pnp_enter_conf_state(struct device *dev);
static void pnp_exit_conf_state(struct device *dev);
struct chip_operations superio_smsc_lpc47n217_ops = {
CHIP_NAME("SMSC LPC47N217 Super I/O")
.enable_dev = enable_dev,
};
static struct device_operations ops = {
.read_resources = pnp_read_resources,
.set_resources = lpc47n217_pnp_set_resources,
.enable_resources = lpc47n217_pnp_enable_resources,
.enable = lpc47n217_pnp_enable,
.init = lpc47n217_init,
};
static struct pnp_info pnp_dev_info[] = {
{ NULL, LPC47N217_PP, PNP_IO0 | PNP_IRQ0 | PNP_DRQ0, 0x07f8, },
{ NULL, LPC47N217_SP1, PNP_IO0 | PNP_IRQ0, 0x07f8, },
{ NULL, LPC47N217_SP2, PNP_IO0 | PNP_IRQ0, 0x07f8, }
};
/**
* Create device structures and allocate resources to devices specified in the
* pnp_dev_info array (above).
*
* @param dev Pointer to structure describing a Super I/O device.
*/
static void enable_dev(struct device *dev)
{
pnp_enable_devices(dev, &ops, ARRAY_SIZE(pnp_dev_info), pnp_dev_info);
}
/**
* Configure the specified Super I/O device with the resources (I/O space,
* etc.) that have been allocate for it.
*
* NOTE: Cannot use pnp_set_resources() here because it assumes chip
* support for logical devices, which the LPC47N217 doesn't have.
*
* @param dev Pointer to structure describing a Super I/O device.
*/
static void lpc47n217_pnp_set_resources(struct device *dev)
{
struct resource *res;
pnp_enter_conf_state(dev);
for (res = dev->resource_list; res; res = res->next)
lpc47n217_pnp_set_resource(dev, res);
/* dump_pnp_device(dev); */
pnp_exit_conf_state(dev);
}
/*
* NOTE: Cannot use pnp_enable_resources() here because it assumes chip
* support for logical devices, which the LPC47N217 doesn't have.
*/
static void lpc47n217_pnp_enable_resources(struct device *dev)
{
pnp_enter_conf_state(dev);
lpc47n217_pnp_set_enable(dev, 1);
pnp_exit_conf_state(dev);
}
/*
* NOTE: Cannot use pnp_set_enable() here because it assumes chip
* support for logical devices, which the LPC47N217 doesn't have.
*/
static void lpc47n217_pnp_enable(struct device *dev)
{
pnp_enter_conf_state(dev);
lpc47n217_pnp_set_enable(dev, !!dev->enabled);
pnp_exit_conf_state(dev);
}
/**
* Initialize the specified Super I/O device.
*
* Devices other than COM ports are ignored. For COM ports, we configure the
* baud rate.
*
* @param dev Pointer to structure describing a Super I/O device.
*/
static void lpc47n217_init(struct device *dev)
{
if (!dev->enabled)
return;
}
static void lpc47n217_pnp_set_resource(struct device *dev, struct resource *resource)
{
if (!(resource->flags & IORESOURCE_ASSIGNED)) {
printk(BIOS_ERR, "ERROR: %s %02lx not allocated\n",
dev_path(dev), resource->index);
return;
}
/* Now store the resource. */
/*
* NOTE: Cannot use pnp_set_XXX() here because they assume chip
* support for logical devices, which the LPC47N217 doesn't have.
*/
if (resource->flags & IORESOURCE_IO) {
lpc47n217_pnp_set_iobase(dev, resource->base);
} else if (resource->flags & IORESOURCE_DRQ) {
lpc47n217_pnp_set_drq(dev, resource->base);
} else if (resource->flags & IORESOURCE_IRQ) {
lpc47n217_pnp_set_irq(dev, 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, "");
}
static void lpc47n217_pnp_set_iobase(struct device *dev, u16 iobase)
{
ASSERT(!(iobase & 0x3));
switch (dev->path.pnp.device) {
case LPC47N217_PP:
pnp_write_config(dev, 0x23, (iobase >> 2) & 0xff);
break;
case LPC47N217_SP1:
pnp_write_config(dev, 0x24, (iobase >> 2) & 0xff);
break;
case LPC47N217_SP2:
pnp_write_config(dev, 0x25, (iobase >> 2) & 0xff);
break;
default:
BUG();
break;
}
}
static void lpc47n217_pnp_set_drq(struct device *dev, u8 drq)
{
const u8 PP_DMA_MASK = 0x0F;
const u8 PP_DMA_SELECTION_REGISTER = 0x26;
u8 current_config, new_config;
if (dev->path.pnp.device == LPC47N217_PP) {
current_config = pnp_read_config(dev,
PP_DMA_SELECTION_REGISTER);
ASSERT(!(drq & ~PP_DMA_MASK)); /* DRQ out of range? */
new_config = (current_config & ~PP_DMA_MASK) | drq;
pnp_write_config(dev, PP_DMA_SELECTION_REGISTER, new_config);
} else {
BUG();
}
}
static void lpc47n217_pnp_set_irq(struct device *dev, u8 irq)
{
u8 irq_config_register = 0, irq_config_mask = 0;
u8 current_config, new_config;
switch (dev->path.pnp.device) {
case LPC47N217_PP:
irq_config_register = 0x27;
irq_config_mask = 0x0F;
break;
case LPC47N217_SP1:
irq_config_register = 0x28;
irq_config_mask = 0xF0;
irq <<= 4;
break;
case LPC47N217_SP2:
irq_config_register = 0x28;
irq_config_mask = 0x0F;
break;
default:
BUG();
return;
}
ASSERT(!(irq & ~irq_config_mask)); /* IRQ out of range? */
current_config = pnp_read_config(dev, irq_config_register);
new_config = (current_config & ~irq_config_mask) | irq;
pnp_write_config(dev, irq_config_register, new_config);
}
static void lpc47n217_pnp_set_enable(struct device *dev, int enable)
{
u8 power_register = 0, power_mask = 0, current_power, new_power;
switch (dev->path.pnp.device) {
case LPC47N217_PP:
power_register = 0x01;
power_mask = 0x04;
break;
case LPC47N217_SP1:
power_register = 0x02;
power_mask = 0x08;
break;
case LPC47N217_SP2:
power_register = 0x02;
power_mask = 0x80;
break;
default:
BUG();
return;
}
current_power = pnp_read_config(dev, power_register);
new_power = current_power & ~power_mask; /* Disable by default. */
if (enable) {
struct resource* ioport_resource;
ioport_resource = find_resource(dev, PNP_IDX_IO0);
lpc47n217_pnp_set_iobase(dev, ioport_resource->base);
new_power |= power_mask; /* Enable. */
} else {
lpc47n217_pnp_set_iobase(dev, 0);
}
pnp_write_config(dev, power_register, new_power);
}
static void pnp_enter_conf_state(struct device *dev)
{
outb(0x55, dev->path.pnp.port);
}
static void pnp_exit_conf_state(struct device *dev)
{
outb(0xaa, dev->path.pnp.port);
}
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