/*
* Broadcom specific AMBA
* Broadcom MIPS32 74K core driver
*
* Copyright 2009, Broadcom Corporation
* Copyright 2006, 2007, Michael Buesch <mb@bu3sch.de>
* Copyright 2010, Bernhard Loos <bernhardloos@googlemail.com>
* Copyright 2011, Hauke Mehrtens <hauke@hauke-m.de>
*
* Licensed under the GNU/GPL. See COPYING for details.
*/
#include "bcma_private.h"
#include <linux/bcma/bcma.h>
#include <linux/serial.h>
#include <linux/serial_core.h>
#include <linux/serial_reg.h>
#include <linux/time.h>
/* The 47162a0 hangs when reading MIPS DMP registers registers */
static inline bool bcma_core_mips_bcm47162a0_quirk(struct bcma_device *dev)
{
return dev->bus->chipinfo.id == 47162 && dev->bus->chipinfo.rev == 0 &&
dev->id.id == BCMA_CORE_MIPS_74K;
}
/* The 5357b0 hangs when reading USB20H DMP registers */
static inline bool bcma_core_mips_bcm5357b0_quirk(struct bcma_device *dev)
{
return (dev->bus->chipinfo.id == 0x5357 ||
dev->bus->chipinfo.id == 0x4749) &&
dev->bus->chipinfo.pkg == 11 &&
dev->id.id == BCMA_CORE_USB20_HOST;
}
static inline u32 mips_read32(struct bcma_drv_mips *mcore,
u16 offset)
{
return bcma_read32(mcore->core, offset);
}
static inline void mips_write32(struct bcma_drv_mips *mcore,
u16 offset,
u32 value)
{
bcma_write32(mcore->core, offset, value);
}
static const u32 ipsflag_irq_mask[] = {
0,
BCMA_MIPS_IPSFLAG_IRQ1,
BCMA_MIPS_IPSFLAG_IRQ2,
BCMA_MIPS_IPSFLAG_IRQ3,
BCMA_MIPS_IPSFLAG_IRQ4,
};
static const u32 ipsflag_irq_shift[] = {
0,
BCMA_MIPS_IPSFLAG_IRQ1_SHIFT,
BCMA_MIPS_IPSFLAG_IRQ2_SHIFT,
BCMA_MIPS_IPSFLAG_IRQ3_SHIFT,
BCMA_MIPS_IPSFLAG_IRQ4_SHIFT,
};
static u32 bcma_core_mips_irqflag(struct bcma_device *dev)
{
u32 flag;
if (bcma_core_mips_bcm47162a0_quirk(dev))
return dev->core_index;
if (bcma_core_mips_bcm5357b0_quirk(dev))
return dev->core_index;
flag = bcma_aread32(dev, BCMA_MIPS_OOBSELOUTA30);
return flag & 0x1F;
}
/* Get the MIPS IRQ assignment for a specified device.
* If unassigned, 0 is returned.
*/
unsigned int bcma_core_mips_irq(struct bcma_device *dev)
{
struct bcma_device *mdev = dev->bus->drv_mips.core;
u32 irqflag;
unsigned int irq;
irqflag = bcma_core_mips_irqflag(dev);
for (irq = 1; irq <= 4; irq++)
if (bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq)) &
(1 << irqflag))
return irq;
return 0;
}
EXPORT_SYMBOL(bcma_core_mips_irq);
static void bcma_core_mips_set_irq(struct bcma_device *dev, unsigned int irq)
{
unsigned int oldirq = bcma_core_mips_irq(dev);
struct bcma_bus *bus = dev->bus;
struct bcma_device *mdev = bus->drv_mips.core;
u32 irqflag;
irqflag = bcma_core_mips_irqflag(dev);
BUG_ON(oldirq == 6);
dev->irq = irq + 2;
/* clear the old irq */
if (oldirq == 0)
bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0),
bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0)) &
~(1 << irqflag));
else
bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq), 0);
/* assign the new one */
if (irq == 0) {
bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0),
bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0)) |
(1 << irqflag));
} else {
u32 oldirqflag = bcma_read32(mdev,
BCMA_MIPS_MIPS74K_INTMASK(irq));
if (oldirqflag) {
struct bcma_device *core;
/* backplane irq line is in use, find out who uses
* it and set user to irq 0
*/
list_for_each_entry_reverse(core, &bus->cores, list) {
if ((1 << bcma_core_mips_irqflag(core)) ==
oldirqflag) {
bcma_core_mips_set_irq(core, 0);
break;
}
}
}
bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq),
1 << irqflag);
}
pr_info("set_irq: core 0x%04x, irq %d => %d\n",
dev->id.id, oldirq + 2, irq + 2);
}
static void bcma_core_mips_print_irq(struct bcma_device *dev, unsigned int irq)
{
int i;
static const char *irq_name[] = {"2(S)", "3", "4", "5", "6", "D", "I"};
printk(KERN_INFO KBUILD_MODNAME ": core 0x%04x, irq :", dev->id.id);
for (i = 0; i <= 6; i++)
printk(" %s%s", irq_name[i], i == irq ? "*" : " ");
printk("\n");
}
static void bcma_core_mips_dump_irq(struct bcma_bus *bus)
{
struct bcma_device *core;
list_for_each_entry_reverse(core, &bus->cores, list) {
bcma_core_mips_print_irq(core, bcma_core_mips_irq(core));
}
}
u32 bcma_cpu_clock(struct bcma_drv_mips *mcore)
{
struct bcma_bus *bus = mcore->core->bus;
if (bus->drv_cc.capabilities & BCMA_CC_CAP_PMU)
return bcma_pmu_get_clockcpu(&bus->drv_cc);
pr_err("No PMU available, need this to get the cpu clock\n");
return 0;
}
EXPORT_SYMBOL(bcma_cpu_clock);
static void bcma_core_mips_flash_detect(struct bcma_drv_mips *mcore)
{
struct bcma_bus *bus = mcore->core->bus;
switch (bus->drv_cc.capabilities & BCMA_CC_CAP_FLASHT) {
case BCMA_CC_FLASHT_STSER:
case BCMA_CC_FLASHT_ATSER:
pr_err("Serial flash not supported.\n");
break;
case BCMA_CC_FLASHT_PARA:
pr_info("found parallel flash.\n");
bus->drv_cc.pflash.window = 0x1c000000;
bus->drv_cc.pflash.window_size = 0x02000000;
if ((bcma_read32(bus->drv_cc.core, BCMA_CC_FLASH_CFG) &
BCMA_CC_FLASH_CFG_DS) == 0)
bus->drv_cc.pflash.buswidth = 1;
else
bus->drv_cc.pflash.buswidth = 2;
break;
default:
pr_err("flash not supported.\n");
}
}
void bcma_core_mips_init(struct bcma_drv_mips *mcore)
{
struct bcma_bus *bus;
struct bcma_device *core;
bus = mcore->core->bus;
pr_info("Initializing MIPS core...\n");
if (!mcore->setup_done)
mcore->assigned_irqs = 1;
/* Assign IRQs to all cores on the bus */
list_for_each_entry_reverse(core, &bus->cores, list) {
int mips_irq;
if (core->irq)
continue;
mips_irq = bcma_core_mips_irq(core);
if (mips_irq > 4)
core->irq = 0;
else
core->irq = mips_irq + 2;
if (core->irq > 5)
continue;
switch (core->id.id) {
case BCMA_CORE_PCI:
case BCMA_CORE_PCIE:
case BCMA_CORE_ETHERNET:
case BCMA_CORE_ETHERNET_GBIT:
case BCMA_CORE_MAC_GBIT:
case BCMA_CORE_80211:
case BCMA_CORE_USB20_HOST:
/* These devices get their own IRQ line if available,
* the rest goes on IRQ0
*/
if (mcore->assigned_irqs <= 4)
bcma_core_mips_set_irq(core,
mcore->assigned_irqs++);
break;
}
}
pr_info("IRQ reconfiguration done\n");
bcma_core_mips_dump_irq(bus);
if (mcore->setup_done)
return;
bcma_chipco_serial_init(&bus->drv_cc);
bcma_core_mips_flash_detect(mcore);
mcore->setup_done = true;
}
