279 lines
7 KiB
C
279 lines
7 KiB
C
/*
|
|
* Sonics Silicon Backplane
|
|
* Broadcom MIPS core driver
|
|
*
|
|
* Copyright 2005, Broadcom Corporation
|
|
* Copyright 2006, 2007, Michael Buesch <mb@bu3sch.de>
|
|
* Copyright 2006, 2007, Felix Fietkau <nbd@openwrt.org>
|
|
*
|
|
* 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 <asm/time.h>
|
|
|
|
#include "../ssb_private.h"
|
|
|
|
#define mips_read32(mcore, offset) ssb_read32((mcore)->dev, offset)
|
|
#define mips_write32(mcore, offset, value) ssb_write32((mcore)->dev, offset, value)
|
|
#define extif_read32(extif, offset) ssb_read32((extif)->dev, offset)
|
|
#define extif_write32(extif, offset, value) ssb_write32((extif)->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)
|
|
{
|
|
return ssb_read32(dev, SSB_TPSFLAG) & SSB_TPSFLAG_BPFLAG;
|
|
}
|
|
|
|
/* Get the MIPS IRQ assignment for a specified device.
|
|
* If unassigned, 0 is returned.
|
|
*/
|
|
unsigned int ssb_mips_irq(struct ssb_device *dev)
|
|
{
|
|
struct ssb_bus *bus = dev->bus;
|
|
u32 irqflag;
|
|
u32 ipsflag;
|
|
u32 tmp;
|
|
unsigned int irq;
|
|
|
|
irqflag = ssb_irqflag(dev);
|
|
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)
|
|
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);
|
|
|
|
dev->irq = irq + 2;
|
|
|
|
ssb_dprintk(KERN_INFO PFX
|
|
"set_irq: core 0x%04x, irq %d => %d\n",
|
|
dev->id.coreid, oldirq, irq);
|
|
/* clear the old irq */
|
|
if (oldirq == 0)
|
|
ssb_write32(mdev, SSB_INTVEC, (~(1 << irqflag) & ssb_read32(mdev, SSB_INTVEC)));
|
|
else
|
|
clear_irq(bus, oldirq);
|
|
|
|
/* assign the new one */
|
|
if (irq == 0)
|
|
ssb_write32(mdev, SSB_INTVEC, ((1 << irqflag) & ssb_read32(mdev, SSB_INTVEC)));
|
|
|
|
irqflag <<= ipsflag_irq_shift[irq];
|
|
irqflag |= (ssb_read32(mdev, SSB_IPSFLAG) & ~ipsflag_irq_mask[irq]);
|
|
ssb_write32(mdev, SSB_IPSFLAG, irqflag);
|
|
}
|
|
|
|
static int ssb_extif_serial_init(struct ssb_extif *dev, struct ssb_serial_port *ports)
|
|
{
|
|
//TODO if (EXTIF available
|
|
#if 0
|
|
extifregs_t *eir = (extifregs_t *) regs;
|
|
sbconfig_t *sb;
|
|
|
|
/* Determine external UART register base */
|
|
sb = (sbconfig_t *)((ulong) eir + SBCONFIGOFF);
|
|
base = EXTIF_CFGIF_BASE(sb_base(R_REG(&sb->sbadmatch1)));
|
|
|
|
/* Determine IRQ */
|
|
irq = sb_irq(sbh);
|
|
|
|
/* Disable GPIO interrupt initially */
|
|
W_REG(&eir->gpiointpolarity, 0);
|
|
W_REG(&eir->gpiointmask, 0);
|
|
|
|
/* Search for external UARTs */
|
|
n = 2;
|
|
for (i = 0; i < 2; i++) {
|
|
regs = (void *) REG_MAP(base + (i * 8), 8);
|
|
if (BCMINIT(serial_exists)(regs)) {
|
|
/* Set GPIO 1 to be the external UART IRQ */
|
|
W_REG(&eir->gpiointmask, 2);
|
|
if (add)
|
|
add(regs, irq, 13500000, 0);
|
|
}
|
|
}
|
|
|
|
/* Add internal UART if enabled */
|
|
if (R_REG(&eir->corecontrol) & CC_UE)
|
|
if (add)
|
|
add((void *) &eir->uartdata, irq, sb_clock(sbh), 2);
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
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;
|
|
|
|
if (bus->chipco.dev) {
|
|
mcore->flash_window = 0x1c000000;
|
|
mcore->flash_window_size = 0x800000;
|
|
} else {
|
|
mcore->flash_window = 0x1fc00000;
|
|
mcore->flash_window_size = 0x400000;
|
|
}
|
|
}
|
|
|
|
static void ssb_extif_timing_init(struct ssb_extif *extif, u32 ns)
|
|
{
|
|
u32 tmp;
|
|
|
|
/* Initialize extif so we can get to the LEDs and external UART */
|
|
extif_write32(extif, SSB_EXTIF_PROG_CFG, SSB_EXTCFG_EN);
|
|
|
|
/* Set timing for the flash */
|
|
tmp = ceildiv(10, ns) << SSB_PROG_WCNT_3_SHIFT;
|
|
tmp |= ceildiv(40, ns) << SSB_PROG_WCNT_1_SHIFT;
|
|
tmp |= ceildiv(120, ns);
|
|
extif_write32(extif, SSB_EXTIF_PROG_WAITCNT, tmp);
|
|
|
|
/* Set programmable interface timing for external uart */
|
|
tmp = ceildiv(10, ns) << SSB_PROG_WCNT_3_SHIFT;
|
|
tmp |= ceildiv(20, ns) << SSB_PROG_WCNT_2_SHIFT;
|
|
tmp |= ceildiv(100, ns) << SSB_PROG_WCNT_1_SHIFT;
|
|
tmp |= ceildiv(120, ns);
|
|
extif_write32(extif, SSB_EXTIF_PROG_WAITCNT, tmp);
|
|
}
|
|
|
|
static inline void ssb_extif_get_clockcontrol(struct ssb_extif *extif,
|
|
u32 *pll_type, u32 *n, u32 *m)
|
|
{
|
|
*pll_type = SSB_PLLTYPE_1;
|
|
*n = extif_read32(extif, SSB_EXTIF_CLOCK_N);
|
|
*m = extif_read32(extif, SSB_EXTIF_CLOCK_SB);
|
|
}
|
|
|
|
u32 ssb_cpu_clock(struct ssb_mipscore *mcore)
|
|
{
|
|
struct ssb_bus *bus = mcore->dev->bus;
|
|
u32 pll_type, n, m, rate = 0;
|
|
|
|
if (bus->extif.dev) {
|
|
ssb_extif_get_clockcontrol(&bus->extif, &pll_type, &n, &m);
|
|
} else if (bus->chipco.dev) {
|
|
if (bus->chip_id == 0x5365)
|
|
/* FIXME: is this override really necessary? */
|
|
return 200000000;
|
|
|
|
ssb_chipco_get_clockcontrol(&bus->chipco, &pll_type, &n, &m);
|
|
} else
|
|
return 0;
|
|
|
|
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 = mcore->dev->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");
|
|
|
|
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++) {
|
|
dev = &(bus->devices[i]);
|
|
dev->irq = ssb_mips_irq(dev) + 2;
|
|
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_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;
|
|
}
|
|
}
|
|
}
|
|
|
|
ssb_mips_serial_init(mcore);
|
|
ssb_mips_flash_detect(mcore);
|
|
}
|
|
|
|
EXPORT_SYMBOL(ssb_mips_irq);
|