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/*
* Sonics Silicon Backplane
* Broadcom MIPS core driver
*
* Copyright 2005, Broadcom Corporation
* Copyright 2006, 2007, Michael Buesch <m@bues.ch>
*
* Licensed under the GNU/GPL. See COPYING for details.
*/
#include <linux/ssb/ssb.h>
#include <linux/serial.h>
#include <linux/serial_core.h>
#include <linux/serial_reg.h>
#include <linux/time.h>
#include "ssb_private.h"
static inline u32 mips_read32(struct ssb_mipscore *mcore,
u16 offset)
{
return ssb_read32(mcore->dev, offset);
}
static inline void mips_write32(struct ssb_mipscore *mcore,
u16 offset,
u32 value)
{
ssb_write32(mcore->dev, offset, value);
}
static const u32 ipsflag_irq_mask[] = {
0,
SSB_IPSFLAG_IRQ1,
SSB_IPSFLAG_IRQ2,
SSB_IPSFLAG_IRQ3,
SSB_IPSFLAG_IRQ4,
};
static const u32 ipsflag_irq_shift[] = {
0,
SSB_IPSFLAG_IRQ1_SHIFT,
SSB_IPSFLAG_IRQ2_SHIFT,
SSB_IPSFLAG_IRQ3_SHIFT,
SSB_IPSFLAG_IRQ4_SHIFT,
};
static inline u32 ssb_irqflag(struct ssb_device *dev)
{
u32 tpsflag = ssb_read32(dev, SSB_TPSFLAG);
if (tpsflag)
return ssb_read32(dev, SSB_TPSFLAG) & SSB_TPSFLAG_BPFLAG;
else
/* not irq supported */
return 0x3f;
}
static struct ssb_device *find_device(struct ssb_device *rdev, int irqflag)
{
struct ssb_bus *bus = rdev->bus;
int i;
for (i = 0; i < bus->nr_devices; i++) {
struct ssb_device *dev;
dev = &(bus->devices[i]);
if (ssb_irqflag(dev) == irqflag)
return dev;
}
return NULL;
}
/* Get the MIPS IRQ assignment for a specified device.
* If unassigned, 0 is returned.
* If disabled, 5 is returned.
* If not supported, 6 is returned.
*/
unsigned int ssb_mips_irq(struct ssb_device *dev)
{
struct ssb_bus *bus = dev->bus;
struct ssb_device *mdev = bus->mipscore.dev;
u32 irqflag;
u32 ipsflag;
u32 tmp;
unsigned int irq;
irqflag = ssb_irqflag(dev);
if (irqflag == 0x3f)
return 6;
ipsflag = ssb_read32(bus->mipscore.dev, SSB_IPSFLAG);
for (irq = 1; irq <= 4; irq++) {
tmp = ((ipsflag & ipsflag_irq_mask[irq]) >> ipsflag_irq_shift[irq]);
if (tmp == irqflag)
break;
}
if (irq == 5) {
if ((1 << irqflag) & ssb_read32(mdev, SSB_INTVEC))
irq = 0;
}
return irq;
}
static void clear_irq(struct ssb_bus *bus, unsigned int irq)
{
struct ssb_device *dev = bus->mipscore.dev;
/* Clear the IRQ in the MIPScore backplane registers */
if (irq == 0) {
ssb_write32(dev, SSB_INTVEC, 0);
} else {
ssb_write32(dev, SSB_IPSFLAG,
ssb_read32(dev, SSB_IPSFLAG) |
ipsflag_irq_mask[irq]);
}
}
static void set_irq(struct ssb_device *dev, unsigned int irq)
{
unsigned int oldirq = ssb_mips_irq(dev);
struct ssb_bus *bus = dev->bus;
struct ssb_device *mdev = bus->mipscore.dev;
u32 irqflag = ssb_irqflag(dev);
BUG_ON(oldirq == 6);
dev->irq = irq + 2;
/* clear the old irq */
if (oldirq == 0)
ssb_write32(mdev, SSB_INTVEC, (~(1 << irqflag) & ssb_read32(mdev, SSB_INTVEC)));
else if (oldirq != 5)
clear_irq(bus, oldirq);
/* assign the new one */
if (irq == 0) {
ssb_write32(mdev, SSB_INTVEC, ((1 << irqflag) | ssb_read32(mdev, SSB_INTVEC)));
} else {
u32 ipsflag = ssb_read32(mdev, SSB_IPSFLAG);
if ((ipsflag & ipsflag_irq_mask[irq]) != ipsflag_irq_mask[irq]) {
u32 oldipsflag = (ipsflag & ipsflag_irq_mask[irq]) >> ipsflag_irq_shift[irq];
struct ssb_device *olddev = find_device(dev, oldipsflag);
if (olddev)
set_irq(olddev, 0);
}
irqflag <<= ipsflag_irq_shift[irq];
irqflag |= (ipsflag & ~ipsflag_irq_mask[irq]);
ssb_write32(mdev, SSB_IPSFLAG, irqflag);
}
ssb_dprintk(KERN_INFO PFX
"set_irq: core 0x%04x, irq %d => %d\n",
dev->id.coreid, oldirq+2, irq+2);
}
static void print_irq(struct ssb_device *dev, unsigned int irq)
{
int i;
static const char *irq_name[] = {"2(S)", "3", "4", "5", "6", "D", "I"};
ssb_dprintk(KERN_INFO PFX
"core 0x%04x, irq :", dev->id.coreid);
for (i = 0; i <= 6; i++) {
ssb_dprintk(" %s%s", irq_name[i], i==irq?"*":" ");
}
ssb_dprintk("\n");
}
static void dump_irq(struct ssb_bus *bus)
{
int i;
for (i = 0; i < bus->nr_devices; i++) {
struct ssb_device *dev;
dev = &(bus->devices[i]);
print_irq(dev, ssb_mips_irq(dev));
}
}
static void ssb_mips_serial_init(struct ssb_mipscore *mcore)
{
struct ssb_bus *bus = mcore->dev->bus;
if (bus->extif.dev)
mcore->nr_serial_ports = ssb_extif_serial_init(&bus->extif, mcore->serial_ports);
else if (bus->chipco.dev)
mcore->nr_serial_ports = ssb_chipco_serial_init(&bus->chipco, mcore->serial_ports);
else
mcore->nr_serial_ports = 0;
}
static void ssb_mips_flash_detect(struct ssb_mipscore *mcore)
{
struct ssb_bus *bus = mcore->dev->bus;
/* When there is no chipcommon on the bus there is 4MB flash */
if (!bus->chipco.dev) {
mcore->pflash.buswidth = 2;
mcore->pflash.window = SSB_FLASH1;
mcore->pflash.window_size = SSB_FLASH1_SZ;
return;
}
/* There is ChipCommon, so use it to read info about flash */
switch (bus->chipco.capabilities & SSB_CHIPCO_CAP_FLASHT) {
case SSB_CHIPCO_FLASHT_STSER:
case SSB_CHIPCO_FLASHT_ATSER:
pr_err("Serial flash not supported\n");
break;
case SSB_CHIPCO_FLASHT_PARA:
pr_debug("Found parallel flash\n");
mcore->pflash.window = SSB_FLASH2;
mcore->pflash.window_size = SSB_FLASH2_SZ;
if ((ssb_read32(bus->chipco.dev, SSB_CHIPCO_FLASH_CFG)
& SSB_CHIPCO_CFG_DS16) == 0)
mcore->pflash.buswidth = 1;
else
mcore->pflash.buswidth = 2;
break;
}
}
u32 ssb_cpu_clock(struct ssb_mipscore *mcore)
{
struct ssb_bus *bus = mcore->dev->bus;
u32 pll_type, n, m, rate = 0;
if (bus->chipco.capabilities & SSB_CHIPCO_CAP_PMU)
return ssb_pmu_get_cpu_clock(&bus->chipco);
if (bus->extif.dev) {
ssb_extif_get_clockcontrol(&bus->extif, &pll_type, &n, &m);
} else if (bus->chipco.dev) {
ssb_chipco_get_clockcpu(&bus->chipco, &pll_type, &n, &m);
} else
return 0;
if ((pll_type == SSB_PLLTYPE_5) || (bus->chip_id == 0x5365)) {
rate = 200000000;
} else {
rate = ssb_calc_clock_rate(pll_type, n, m);
}
if (pll_type == SSB_PLLTYPE_6) {
rate *= 2;
}
return rate;
}
void ssb_mipscore_init(struct ssb_mipscore *mcore)
{
struct ssb_bus *bus;
struct ssb_device *dev;
unsigned long hz, ns;
unsigned int irq, i;
if (!mcore->dev)
return; /* We don't have a MIPS core */
ssb_dprintk(KERN_INFO PFX "Initializing MIPS core...\n");
bus = mcore->dev->bus;
hz = ssb_clockspeed(bus);
if (!hz)
hz = 100000000;
ns = 1000000000 / hz;
if (bus->extif.dev)
ssb_extif_timing_init(&bus->extif, ns);
else if (bus->chipco.dev)
ssb_chipco_timing_init(&bus->chipco, ns);
/* Assign IRQs to all cores on the bus, start with irq line 2, because serial usually takes 1 */
for (irq = 2, i = 0; i < bus->nr_devices; i++) {
int mips_irq;
dev = &(bus->devices[i]);
mips_irq = ssb_mips_irq(dev);
if (mips_irq > 4)
dev->irq = 0;
else
dev->irq = mips_irq + 2;
if (dev->irq > 5)
continue;
switch (dev->id.coreid) {
case SSB_DEV_USB11_HOST:
/* shouldn't need a separate irq line for non-4710, most of them have a proper
* external usb controller on the pci */
if ((bus->chip_id == 0x4710) && (irq <= 4)) {
set_irq(dev, irq++);
}
break;
case SSB_DEV_PCI:
case SSB_DEV_ETHERNET:
case SSB_DEV_ETHERNET_GBIT:
case SSB_DEV_80211:
case SSB_DEV_USB20_HOST:
/* These devices get their own IRQ line if available, the rest goes on IRQ0 */
if (irq <= 4) {
set_irq(dev, irq++);
break;
}
/* fallthrough */
case SSB_DEV_EXTIF:
set_irq(dev, 0);
break;
}
}
ssb_dprintk(KERN_INFO PFX "after irq reconfiguration\n");
dump_irq(bus);
ssb_mips_serial_init(mcore);
ssb_mips_flash_detect(mcore);
}
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