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/*
* Sonics Silicon Backplane
* Broadcom ChipCommon core driver
*
* Copyright 2005, Broadcom Corporation
* Copyright 2006, 2007, Michael Buesch <mb@bu3sch.de>
*
* Licensed under the GNU/GPL. See COPYING for details.
*/
#include <linux/ssb/ssb.h>
#include <linux/ssb/ssb_regs.h>
#include <linux/pci.h>
#include "ssb_private.h"
/* Clock sources */
enum {
/* PCI clock */
SSB_CHIPCO_CLKSRC_PCI,
/* Crystal slow clock oscillator */
SSB_CHIPCO_CLKSRC_XTALOS,
/* Low power oscillator */
SSB_CHIPCO_CLKSRC_LOPWROS,
};
static inline u32 chipco_read32(struct ssb_chipcommon *cc,
u16 offset)
{
return ssb_read32(cc->dev, offset);
}
static inline void chipco_write32(struct ssb_chipcommon *cc,
u16 offset,
u32 value)
{
ssb_write32(cc->dev, offset, value);
}
void ssb_chipco_set_clockmode(struct ssb_chipcommon *cc,
enum ssb_clkmode mode)
{
struct ssb_device *ccdev = cc->dev;
struct ssb_bus *bus;
u32 tmp;
if (!ccdev)
return;
bus = ccdev->bus;
/* chipcommon cores prior to rev6 don't support dynamic clock control */
if (ccdev->id.revision < 6)
return;
/* chipcommon cores rev10 are a whole new ball game */
if (ccdev->id.revision >= 10)
return;
if (!(cc->capabilities & SSB_CHIPCO_CAP_PCTL))
return;
switch (mode) {
case SSB_CLKMODE_SLOW:
tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
tmp |= SSB_CHIPCO_SLOWCLKCTL_FSLOW;
chipco_write32(cc, SSB_CHIPCO_SLOWCLKCTL, tmp);
break;
case SSB_CLKMODE_FAST:
ssb_pci_xtal(bus, SSB_GPIO_XTAL, 1); /* Force crystal on */
tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
tmp &= ~SSB_CHIPCO_SLOWCLKCTL_FSLOW;
tmp |= SSB_CHIPCO_SLOWCLKCTL_IPLL;
chipco_write32(cc, SSB_CHIPCO_SLOWCLKCTL, tmp);
break;
case SSB_CLKMODE_DYNAMIC:
tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
tmp &= ~SSB_CHIPCO_SLOWCLKCTL_FSLOW;
tmp &= ~SSB_CHIPCO_SLOWCLKCTL_IPLL;
tmp &= ~SSB_CHIPCO_SLOWCLKCTL_ENXTAL;
if ((tmp & SSB_CHIPCO_SLOWCLKCTL_SRC) != SSB_CHIPCO_SLOWCLKCTL_SRC_XTAL)
tmp |= SSB_CHIPCO_SLOWCLKCTL_ENXTAL;
chipco_write32(cc, SSB_CHIPCO_SLOWCLKCTL, tmp);
/* for dynamic control, we have to release our xtal_pu "force on" */
if (tmp & SSB_CHIPCO_SLOWCLKCTL_ENXTAL)
ssb_pci_xtal(bus, SSB_GPIO_XTAL, 0);
break;
default:
assert(0);
}
}
/* Get the Slow Clock Source */
static int chipco_pctl_get_slowclksrc(struct ssb_chipcommon *cc)
{
struct ssb_bus *bus = cc->dev->bus;
u32 tmp = 0;
if (cc->dev->id.revision < 6) {
if (bus->bustype == SSB_BUSTYPE_SSB ||
bus->bustype == SSB_BUSTYPE_PCMCIA)
return SSB_CHIPCO_CLKSRC_XTALOS;
if (bus->bustype == SSB_BUSTYPE_PCI) {
pci_read_config_dword(bus->host_pci, SSB_GPIO_OUT, &tmp);
if (tmp & 0x10)
return SSB_CHIPCO_CLKSRC_PCI;
return SSB_CHIPCO_CLKSRC_XTALOS;
}
}
if (cc->dev->id.revision < 10) {
tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
tmp &= 0x7;
if (tmp == 0)
return SSB_CHIPCO_CLKSRC_LOPWROS;
if (tmp == 1)
return SSB_CHIPCO_CLKSRC_XTALOS;
if (tmp == 2)
return SSB_CHIPCO_CLKSRC_PCI;
}
return SSB_CHIPCO_CLKSRC_XTALOS;
}
/* Get maximum or minimum (depending on get_max flag) slowclock frequency. */
static int chipco_pctl_clockfreqlimit(struct ssb_chipcommon *cc, int get_max)
{
int limit;
int clocksrc;
int divisor;
u32 tmp;
clocksrc = chipco_pctl_get_slowclksrc(cc);
if (cc->dev->id.revision < 6) {
switch (clocksrc) {
case SSB_CHIPCO_CLKSRC_PCI:
divisor = 64;
break;
case SSB_CHIPCO_CLKSRC_XTALOS:
divisor = 32;
break;
default:
assert(0);
divisor = 1;
}
} else if (cc->dev->id.revision < 10) {
switch (clocksrc) {
case SSB_CHIPCO_CLKSRC_LOPWROS:
divisor = 1;
break;
case SSB_CHIPCO_CLKSRC_XTALOS:
case SSB_CHIPCO_CLKSRC_PCI:
tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
divisor = (tmp >> 16) + 1;
divisor *= 4;
break;
default:
assert(0);
divisor = 1;
}
} else {
tmp = chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL);
divisor = (tmp >> 16) + 1;
divisor *= 4;
}
switch (clocksrc) {
case SSB_CHIPCO_CLKSRC_LOPWROS:
if (get_max)
limit = 43000;
else
limit = 25000;
break;
case SSB_CHIPCO_CLKSRC_XTALOS:
if (get_max)
limit = 20200000;
else
limit = 19800000;
break;
case SSB_CHIPCO_CLKSRC_PCI:
if (get_max)
limit = 34000000;
else
limit = 25000000;
break;
default:
assert(0);
limit = 0;
}
limit /= divisor;
return limit;
}
static void chipco_powercontrol_init(struct ssb_chipcommon *cc)
{
struct ssb_bus *bus = cc->dev->bus;
if (bus->chip_id == 0x4321) {
if (bus->chip_rev == 0)
chipco_write32(cc, SSB_CHIPCO_CHIPCTL, 0x3A4);
else if (bus->chip_rev == 1)
chipco_write32(cc, SSB_CHIPCO_CHIPCTL, 0xA4);
}
if (!(cc->capabilities & SSB_CHIPCO_CAP_PCTL))
return;
if (cc->dev->id.revision >= 10) {
/* Set Idle Power clock rate to 1Mhz */
chipco_write32(cc, SSB_CHIPCO_SYSCLKCTL,
(chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL) &
0x0000FFFF) | 0x00040000);
} else {
int maxfreq;
maxfreq = chipco_pctl_clockfreqlimit(cc, 1);
chipco_write32(cc, SSB_CHIPCO_PLLONDELAY,
(maxfreq * 150 + 999999) / 1000000);
chipco_write32(cc, SSB_CHIPCO_FREFSELDELAY,
(maxfreq * 15 + 999999) / 1000000);
}
}
static void calc_fast_powerup_delay(struct ssb_chipcommon *cc)
{
struct ssb_bus *bus = cc->dev->bus;
int minfreq;
unsigned int tmp;
u32 pll_on_delay;
if (bus->bustype != SSB_BUSTYPE_PCI)
return;
if (!(cc->capabilities & SSB_CHIPCO_CAP_PCTL))
return;
minfreq = chipco_pctl_clockfreqlimit(cc, 0);
pll_on_delay = chipco_read32(cc, SSB_CHIPCO_PLLONDELAY);
tmp = (((pll_on_delay + 2) * 1000000) + (minfreq - 1)) / minfreq;
assert((tmp & ~0xFFFF) == 0);
cc->fast_pwrup_delay = tmp;
}
void ssb_chipcommon_init(struct ssb_chipcommon *cc)
{
if (!cc->dev)
return; /* We don't have a ChipCommon */
chipco_powercontrol_init(cc);
ssb_chipco_set_clockmode(cc, SSB_CLKMODE_FAST);
calc_fast_powerup_delay(cc);
}
void ssb_chipco_suspend(struct ssb_chipcommon *cc, pm_message_t state)
{
if (!cc->dev)
return;
ssb_chipco_set_clockmode(cc, SSB_CLKMODE_SLOW);
}
void ssb_chipco_resume(struct ssb_chipcommon *cc)
{
if (!cc->dev)
return;
chipco_powercontrol_init(cc);
ssb_chipco_set_clockmode(cc, SSB_CLKMODE_FAST);
}
void ssb_chipco_get_clockcontrol(struct ssb_chipcommon *cc,
u32 *plltype, u32 *n, u32 *m)
{
*n = chipco_read32(cc, SSB_CHIPCO_CLOCK_N);
*plltype = (cc->capabilities & SSB_CHIPCO_CAP_PLLT);
switch (*plltype) {
case SSB_PLLTYPE_6: /* 100/200 or 120/240 only */
*m = chipco_read32(cc, SSB_CHIPCO_CLOCK_MIPS);
break;
case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
if (cc->dev->bus->chip_id != 0x5365) {
*m = chipco_read32(cc, SSB_CHIPCO_CLOCK_M2);
break;
}
/* Fallthough */
default:
*m = chipco_read32(cc, SSB_CHIPCO_CLOCK_SB);
}
}
void ssb_chipco_timing_init(struct ssb_chipcommon *cc,
unsigned long ns)
{
struct ssb_device *dev = cc->dev;
struct ssb_bus *bus = dev->bus;
u32 tmp;
/* set register for external IO to control LED. */
chipco_write32(cc, SSB_CHIPCO_PROG_CFG, 0x11);
tmp = DIV_ROUND_UP(10, ns) << SSB_PROG_WCNT_3_SHIFT; /* Waitcount-3 = 10ns */
tmp |= DIV_ROUND_UP(40, ns) << SSB_PROG_WCNT_1_SHIFT; /* Waitcount-1 = 40ns */
tmp |= DIV_ROUND_UP(240, ns); /* Waitcount-0 = 240ns */
chipco_write32(cc, SSB_CHIPCO_PROG_WAITCNT, tmp); /* 0x01020a0c for a 100Mhz clock */
/* Set timing for the flash */
tmp = DIV_ROUND_UP(10, ns) << SSB_FLASH_WCNT_3_SHIFT; /* Waitcount-3 = 10nS */
tmp |= DIV_ROUND_UP(10, ns) << SSB_FLASH_WCNT_1_SHIFT; /* Waitcount-1 = 10nS */
tmp |= DIV_ROUND_UP(120, ns); /* Waitcount-0 = 120nS */
if ((bus->chip_id == 0x5365) ||
(dev->id.revision < 9))
chipco_write32(cc, SSB_CHIPCO_FLASH_WAITCNT, tmp);
if ((bus->chip_id == 0x5365) ||
(dev->id.revision < 9) ||
((bus->chip_id == 0x5350) && (bus->chip_rev == 0)))
chipco_write32(cc, SSB_CHIPCO_PCMCIA_MEMWAIT, tmp);
if (bus->chip_id == 0x5350) {
/* Enable EXTIF */
tmp = DIV_ROUND_UP(10, ns) << SSB_PROG_WCNT_3_SHIFT; /* Waitcount-3 = 10ns */
tmp |= DIV_ROUND_UP(20, ns) << SSB_PROG_WCNT_2_SHIFT; /* Waitcount-2 = 20ns */
tmp |= DIV_ROUND_UP(100, ns) << SSB_PROG_WCNT_1_SHIFT; /* Waitcount-1 = 100ns */
tmp |= DIV_ROUND_UP(120, ns); /* Waitcount-0 = 120ns */
chipco_write32(cc, SSB_CHIPCO_PROG_WAITCNT, tmp); /* 0x01020a0c for a 100Mhz clock */
}
}
#ifdef CONFIG_SSB_SERIAL
int ssb_chipco_serial_init(struct ssb_chipcommon *cc,
struct ssb_serial_port *ports)
{
struct ssb_bus *bus = cc->dev->bus;
int nr_ports = 0;
u32 plltype;
unsigned int irq;
u32 baud_base, div;
u32 i, n;
plltype = (cc->capabilities & SSB_CHIPCO_CAP_PLLT);
irq = ssb_mips_irq(cc->dev);
if (plltype == SSB_PLLTYPE_1) {
/* PLL clock */
baud_base = ssb_calc_clock_rate(plltype,
chipco_read32(cc, SSB_CHIPCO_CLOCK_N),
chipco_read32(cc, SSB_CHIPCO_CLOCK_M2));
div = 1;
} else {
if (cc->dev->id.revision >= 11) {
/* Fixed ALP clock */
baud_base = 20000000;
div = 1;
/* Set the override bit so we don't divide it */
chipco_write32(cc, SSB_CHIPCO_CORECTL,
SSB_CHIPCO_CORECTL_UARTCLK0);
} else if (cc->dev->id.revision >= 3) {
/* Internal backplane clock */
baud_base = ssb_clockspeed(bus);
div = 2; /* Minimum divisor */
chipco_write32(cc, SSB_CHIPCO_CLKDIV,
(chipco_read32(cc, SSB_CHIPCO_CLKDIV)
& ~SSB_CHIPCO_CLKDIV_UART) | div);
} else {
/* Fixed internal backplane clock */
baud_base = 88000000;
div = 48;
}
/* Clock source depends on strapping if UartClkOverride is unset */
if ((cc->dev->id.revision > 0) &&
!(chipco_read32(cc, SSB_CHIPCO_CORECTL) & SSB_CHIPCO_CORECTL_UARTCLK0)) {
if ((cc->capabilities & SSB_CHIPCO_CAP_UARTCLK) ==
SSB_CHIPCO_CAP_UARTCLK_INT) {
/* Internal divided backplane clock */
baud_base /= div;
} else {
/* Assume external clock of 1.8432 MHz */
baud_base = 1843200;
}
}
}
/* Determine the registers of the UARTs */
n = (cc->capabilities & SSB_CHIPCO_CAP_NRUART);
for (i = 0; i < n; i++) {
void __iomem *cc_mmio;
void __iomem *uart_regs;
cc_mmio = cc->dev->bus->mmio + (cc->dev->core_index * SSB_CORE_SIZE);
uart_regs = cc_mmio + SSB_CHIPCO_UART0_DATA;
/* Offset changed at after rev 0 */
if (cc->dev->id.revision == 0)
uart_regs += (i * 8);
else
uart_regs += (i * 256);
nr_ports++;
ports[i].regs = uart_regs;
ports[i].irq = irq;
ports[i].baud_base = baud_base;
ports[i].reg_shift = 0;
}
return nr_ports;
}
#endif /* CONFIG_SSB_SERIAL */
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