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/*
* Support for 'media5200-platform' compatible boards.
*
* Copyright (C) 2008 Secret Lab Technologies Ltd.
*
* 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; either version 2 of the License, or (at your
* option) any later version.
*
* Description:
* This code implements support for the Freescape Media5200 platform
* (built around the MPC5200 SoC).
*
* Notable characteristic of the Media5200 is the presence of an FPGA
* that has all external IRQ lines routed through it. This file implements
* a cascaded interrupt controller driver which attaches itself to the
* Virtual IRQ subsystem after the primary mpc5200 interrupt controller
* is initialized.
*
*/
#undef DEBUG
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <asm/time.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/mpc52xx.h>
static const struct of_device_id mpc5200_gpio_ids[] __initconst = {
{ .compatible = "fsl,mpc5200-gpio", },
{ .compatible = "mpc5200-gpio", },
{}
};
/* FPGA register set */
#define MEDIA5200_IRQ_ENABLE (0x40c)
#define MEDIA5200_IRQ_STATUS (0x410)
#define MEDIA5200_NUM_IRQS (6)
#define MEDIA5200_IRQ_SHIFT (32 - MEDIA5200_NUM_IRQS)
struct media5200_irq {
void __iomem *regs;
spinlock_t lock;
struct irq_domain *irqhost;
};
struct media5200_irq media5200_irq;
static void media5200_irq_unmask(struct irq_data *d)
{
unsigned long flags;
u32 val;
spin_lock_irqsave(&media5200_irq.lock, flags);
val = in_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE);
val |= 1 << (MEDIA5200_IRQ_SHIFT + irqd_to_hwirq(d));
out_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE, val);
spin_unlock_irqrestore(&media5200_irq.lock, flags);
}
static void media5200_irq_mask(struct irq_data *d)
{
unsigned long flags;
u32 val;
spin_lock_irqsave(&media5200_irq.lock, flags);
val = in_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE);
val &= ~(1 << (MEDIA5200_IRQ_SHIFT + irqd_to_hwirq(d)));
out_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE, val);
spin_unlock_irqrestore(&media5200_irq.lock, flags);
}
static struct irq_chip media5200_irq_chip = {
.name = "Media5200 FPGA",
.irq_unmask = media5200_irq_unmask,
.irq_mask = media5200_irq_mask,
.irq_mask_ack = media5200_irq_mask,
};
static void media5200_irq_cascade(struct irq_desc *desc)
{
struct irq_chip *chip = irq_desc_get_chip(desc);
int sub_virq, val;
u32 status, enable;
/* Mask off the cascaded IRQ */
raw_spin_lock(&desc->lock);
chip->irq_mask(&desc->irq_data);
raw_spin_unlock(&desc->lock);
/* Ask the FPGA for IRQ status. If 'val' is 0, then no irqs
* are pending. 'ffs()' is 1 based */
status = in_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE);
enable = in_be32(media5200_irq.regs + MEDIA5200_IRQ_STATUS);
val = ffs((status & enable) >> MEDIA5200_IRQ_SHIFT);
if (val) {
sub_virq = irq_linear_revmap(media5200_irq.irqhost, val - 1);
/* pr_debug("%s: virq=%i s=%.8x e=%.8x hwirq=%i subvirq=%i\n",
* __func__, virq, status, enable, val - 1, sub_virq);
*/
generic_handle_irq(sub_virq);
}
/* Processing done; can reenable the cascade now */
raw_spin_lock(&desc->lock);
chip->irq_ack(&desc->irq_data);
if (!irqd_irq_disabled(&desc->irq_data))
chip->irq_unmask(&desc->irq_data);
raw_spin_unlock(&desc->lock);
}
static int media5200_irq_map(struct irq_domain *h, unsigned int virq,
irq_hw_number_t hw)
{
pr_debug("%s: h=%p, virq=%i, hwirq=%i\n", __func__, h, virq, (int)hw);
irq_set_chip_data(virq, &media5200_irq);
irq_set_chip_and_handler(virq, &media5200_irq_chip, handle_level_irq);
irq_set_status_flags(virq, IRQ_LEVEL);
return 0;
}
static int media5200_irq_xlate(struct irq_domain *h, struct device_node *ct,
const u32 *intspec, unsigned int intsize,
irq_hw_number_t *out_hwirq,
unsigned int *out_flags)
{
if (intsize != 2)
return -1;
pr_debug("%s: bank=%i, number=%i\n", __func__, intspec[0], intspec[1]);
*out_hwirq = intspec[1];
*out_flags = IRQ_TYPE_NONE;
return 0;
}
static const struct irq_domain_ops media5200_irq_ops = {
.map = media5200_irq_map,
.xlate = media5200_irq_xlate,
};
/*
* Setup Media5200 IRQ mapping
*/
static void __init media5200_init_irq(void)
{
struct device_node *fpga_np;
int cascade_virq;
/* First setup the regular MPC5200 interrupt controller */
mpc52xx_init_irq();
/* Now find the FPGA IRQ */
fpga_np = of_find_compatible_node(NULL, NULL, "fsl,media5200-fpga");
if (!fpga_np)
goto out;
pr_debug("%s: found fpga node: %s\n", __func__, fpga_np->full_name);
media5200_irq.regs = of_iomap(fpga_np, 0);
if (!media5200_irq.regs)
goto out;
pr_debug("%s: mapped to %p\n", __func__, media5200_irq.regs);
cascade_virq = irq_of_parse_and_map(fpga_np, 0);
if (!cascade_virq)
goto out;
pr_debug("%s: cascaded on virq=%i\n", __func__, cascade_virq);
/* Disable all FPGA IRQs */
out_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE, 0);
spin_lock_init(&media5200_irq.lock);
media5200_irq.irqhost = irq_domain_add_linear(fpga_np,
MEDIA5200_NUM_IRQS, &media5200_irq_ops, &media5200_irq);
if (!media5200_irq.irqhost)
goto out;
pr_debug("%s: allocated irqhost\n", __func__);
irq_set_handler_data(cascade_virq, &media5200_irq);
irq_set_chained_handler(cascade_virq, media5200_irq_cascade);
return;
out:
pr_err("Could not find Media5200 FPGA; PCI interrupts will not work\n");
}
/*
* Setup the architecture
*/
static void __init media5200_setup_arch(void)
{
struct device_node *np;
struct mpc52xx_gpio __iomem *gpio;
u32 port_config;
if (ppc_md.progress)
ppc_md.progress("media5200_setup_arch()", 0);
/* Map important registers from the internal memory map */
mpc52xx_map_common_devices();
/* Some mpc5200 & mpc5200b related configuration */
mpc5200_setup_xlb_arbiter();
mpc52xx_setup_pci();
np = of_find_matching_node(NULL, mpc5200_gpio_ids);
gpio = of_iomap(np, 0);
of_node_put(np);
if (!gpio) {
printk(KERN_ERR "%s() failed. expect abnormal behavior\n",
__func__);
return;
}
/* Set port config */
port_config = in_be32(&gpio->port_config);
port_config &= ~0x03000000; /* ATA CS is on csb_4/5 */
port_config |= 0x01000000;
out_be32(&gpio->port_config, port_config);
/* Unmap zone */
iounmap(gpio);
}
/* list of the supported boards */
static const char * const board[] __initconst = {
"fsl,media5200",
NULL
};
/*
* Called very early, MMU is off, device-tree isn't unflattened
*/
static int __init media5200_probe(void)
{
return of_flat_dt_match(of_get_flat_dt_root(), board);
}
define_machine(media5200_platform) {
.name = "media5200-platform",
.probe = media5200_probe,
.setup_arch = media5200_setup_arch,
.init = mpc52xx_declare_of_platform_devices,
.init_IRQ = media5200_init_irq,
.get_irq = mpc52xx_get_irq,
.restart = mpc52xx_restart,
.calibrate_decr = generic_calibrate_decr,
};
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