diff options
Diffstat (limited to 'drivers/ssb/driver_chipcommon.c')
| -rw-r--r-- | drivers/ssb/driver_chipcommon.c | 697 |
1 files changed, 697 insertions, 0 deletions
diff --git a/drivers/ssb/driver_chipcommon.c b/drivers/ssb/driver_chipcommon.c new file mode 100644 index 000000000..7cb7d2c8f --- /dev/null +++ b/drivers/ssb/driver_chipcommon.c @@ -0,0 +1,697 @@ +/* + * Sonics Silicon Backplane + * Broadcom ChipCommon core driver + * + * Copyright 2005, Broadcom Corporation + * Copyright 2006, 2007, Michael Buesch <m@bues.ch> + * Copyright 2012, Hauke Mehrtens <hauke@hauke-m.de> + * + * Licensed under the GNU/GPL. See COPYING for details. + */ + +#include <linux/ssb/ssb.h> +#include <linux/ssb/ssb_regs.h> +#include <linux/export.h> +#include <linux/pci.h> +#include <linux/bcm47xx_wdt.h> + +#include "ssb_private.h" + + +/* Clock sources */ +enum ssb_clksrc { + /* 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_write32_masked(struct ssb_chipcommon *cc, u16 offset, + u32 mask, u32 value) +{ + value &= mask; + value |= chipco_read32(cc, offset) & ~mask; + chipco_write32(cc, offset, value); + + return 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; + + /* We support SLOW only on 6..9 */ + if (ccdev->id.revision >= 10 && mode == SSB_CLKMODE_SLOW) + mode = SSB_CLKMODE_DYNAMIC; + + if (cc->capabilities & SSB_CHIPCO_CAP_PMU) + return; /* PMU controls clockmode, separated function needed */ + SSB_WARN_ON(ccdev->id.revision >= 20); + + /* chipcommon cores prior to rev6 don't support dynamic clock control */ + if (ccdev->id.revision < 6) + return; + + /* ChipCommon cores rev10+ need testing */ + if (ccdev->id.revision >= 10) + return; + + if (!(cc->capabilities & SSB_CHIPCO_CAP_PCTL)) + return; + + switch (mode) { + case SSB_CLKMODE_SLOW: /* For revs 6..9 only */ + tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL); + tmp |= SSB_CHIPCO_SLOWCLKCTL_FSLOW; + chipco_write32(cc, SSB_CHIPCO_SLOWCLKCTL, tmp); + break; + case SSB_CLKMODE_FAST: + if (ccdev->id.revision < 10) { + 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); + } else { + chipco_write32(cc, SSB_CHIPCO_SYSCLKCTL, + (chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL) | + SSB_CHIPCO_SYSCLKCTL_FORCEHT)); + /* udelay(150); TODO: not available in early init */ + } + break; + case SSB_CLKMODE_DYNAMIC: + if (ccdev->id.revision < 10) { + 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); + } else { + chipco_write32(cc, SSB_CHIPCO_SYSCLKCTL, + (chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL) & + ~SSB_CHIPCO_SYSCLKCTL_FORCEHT)); + } + break; + default: + SSB_WARN_ON(1); + } +} + +/* Get the Slow Clock Source */ +static enum ssb_clksrc chipco_pctl_get_slowclksrc(struct ssb_chipcommon *cc) +{ + struct ssb_bus *bus = cc->dev->bus; + u32 uninitialized_var(tmp); + + 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 uninitialized_var(limit); + enum ssb_clksrc clocksrc; + int divisor = 1; + 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: + SSB_WARN_ON(1); + } + } else if (cc->dev->id.revision < 10) { + switch (clocksrc) { + case SSB_CHIPCO_CLKSRC_LOPWROS: + 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; + } + } 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; + } + 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); + } +} + +/* http://bcm-v4.sipsolutions.net/802.11/PmuFastPwrupDelay */ +static u16 pmu_fast_powerup_delay(struct ssb_chipcommon *cc) +{ + struct ssb_bus *bus = cc->dev->bus; + + switch (bus->chip_id) { + case 0x4312: + case 0x4322: + case 0x4328: + return 7000; + case 0x4325: + /* TODO: */ + default: + return 15000; + } +} + +/* http://bcm-v4.sipsolutions.net/802.11/ClkctlFastPwrupDelay */ +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_PMU) { + cc->fast_pwrup_delay = pmu_fast_powerup_delay(cc); + 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; + SSB_WARN_ON(tmp & ~0xFFFF); + + cc->fast_pwrup_delay = tmp; +} + +static u32 ssb_chipco_alp_clock(struct ssb_chipcommon *cc) +{ + if (cc->capabilities & SSB_CHIPCO_CAP_PMU) + return ssb_pmu_get_alp_clock(cc); + + return 20000000; +} + +static u32 ssb_chipco_watchdog_get_max_timer(struct ssb_chipcommon *cc) +{ + u32 nb; + + if (cc->capabilities & SSB_CHIPCO_CAP_PMU) { + if (cc->dev->id.revision < 26) + nb = 16; + else + nb = (cc->dev->id.revision >= 37) ? 32 : 24; + } else { + nb = 28; + } + if (nb == 32) + return 0xffffffff; + else + return (1 << nb) - 1; +} + +u32 ssb_chipco_watchdog_timer_set_wdt(struct bcm47xx_wdt *wdt, u32 ticks) +{ + struct ssb_chipcommon *cc = bcm47xx_wdt_get_drvdata(wdt); + + if (cc->dev->bus->bustype != SSB_BUSTYPE_SSB) + return 0; + + return ssb_chipco_watchdog_timer_set(cc, ticks); +} + +u32 ssb_chipco_watchdog_timer_set_ms(struct bcm47xx_wdt *wdt, u32 ms) +{ + struct ssb_chipcommon *cc = bcm47xx_wdt_get_drvdata(wdt); + u32 ticks; + + if (cc->dev->bus->bustype != SSB_BUSTYPE_SSB) + return 0; + + ticks = ssb_chipco_watchdog_timer_set(cc, cc->ticks_per_ms * ms); + return ticks / cc->ticks_per_ms; +} + +static int ssb_chipco_watchdog_ticks_per_ms(struct ssb_chipcommon *cc) +{ + struct ssb_bus *bus = cc->dev->bus; + + if (cc->capabilities & SSB_CHIPCO_CAP_PMU) { + /* based on 32KHz ILP clock */ + return 32; + } else { + if (cc->dev->id.revision < 18) + return ssb_clockspeed(bus) / 1000; + else + return ssb_chipco_alp_clock(cc) / 1000; + } +} + +void ssb_chipcommon_init(struct ssb_chipcommon *cc) +{ + if (!cc->dev) + return; /* We don't have a ChipCommon */ + + spin_lock_init(&cc->gpio_lock); + + if (cc->dev->id.revision >= 11) + cc->status = chipco_read32(cc, SSB_CHIPCO_CHIPSTAT); + ssb_dbg("chipcommon status is 0x%x\n", cc->status); + + if (cc->dev->id.revision >= 20) { + chipco_write32(cc, SSB_CHIPCO_GPIOPULLUP, 0); + chipco_write32(cc, SSB_CHIPCO_GPIOPULLDOWN, 0); + } + + ssb_pmu_init(cc); + chipco_powercontrol_init(cc); + ssb_chipco_set_clockmode(cc, SSB_CLKMODE_FAST); + calc_fast_powerup_delay(cc); + + if (cc->dev->bus->bustype == SSB_BUSTYPE_SSB) { + cc->ticks_per_ms = ssb_chipco_watchdog_ticks_per_ms(cc); + cc->max_timer_ms = ssb_chipco_watchdog_get_max_timer(cc) / cc->ticks_per_ms; + } +} + +void ssb_chipco_suspend(struct ssb_chipcommon *cc) +{ + 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); +} + +/* Get the processor clock */ +void ssb_chipco_get_clockcpu(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_2: + case SSB_PLLTYPE_4: + case SSB_PLLTYPE_6: + case SSB_PLLTYPE_7: + *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_MIPS); + break; + case SSB_PLLTYPE_3: + /* 5350 uses m2 to control mips */ + *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_M2); + break; + default: + *m = chipco_read32(cc, SSB_CHIPCO_CLOCK_SB); + break; + } +} + +/* Get the bus clock */ +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 */ + } +} + +/* Set chip watchdog reset timer to fire in 'ticks' backplane cycles */ +u32 ssb_chipco_watchdog_timer_set(struct ssb_chipcommon *cc, u32 ticks) +{ + u32 maxt; + enum ssb_clkmode clkmode; + + maxt = ssb_chipco_watchdog_get_max_timer(cc); + if (cc->capabilities & SSB_CHIPCO_CAP_PMU) { + if (ticks == 1) + ticks = 2; + else if (ticks > maxt) + ticks = maxt; + chipco_write32(cc, SSB_CHIPCO_PMU_WATCHDOG, ticks); + } else { + clkmode = ticks ? SSB_CLKMODE_FAST : SSB_CLKMODE_DYNAMIC; + ssb_chipco_set_clockmode(cc, clkmode); + if (ticks > maxt) + ticks = maxt; + /* instant NMI */ + chipco_write32(cc, SSB_CHIPCO_WATCHDOG, ticks); + } + return ticks; +} + +void ssb_chipco_irq_mask(struct ssb_chipcommon *cc, u32 mask, u32 value) +{ + chipco_write32_masked(cc, SSB_CHIPCO_IRQMASK, mask, value); +} + +u32 ssb_chipco_irq_status(struct ssb_chipcommon *cc, u32 mask) +{ + return chipco_read32(cc, SSB_CHIPCO_IRQSTAT) & mask; +} + +u32 ssb_chipco_gpio_in(struct ssb_chipcommon *cc, u32 mask) +{ + return chipco_read32(cc, SSB_CHIPCO_GPIOIN) & mask; +} + +u32 ssb_chipco_gpio_out(struct ssb_chipcommon *cc, u32 mask, u32 value) +{ + unsigned long flags; + u32 res = 0; + + spin_lock_irqsave(&cc->gpio_lock, flags); + res = chipco_write32_masked(cc, SSB_CHIPCO_GPIOOUT, mask, value); + spin_unlock_irqrestore(&cc->gpio_lock, flags); + + return res; +} + +u32 ssb_chipco_gpio_outen(struct ssb_chipcommon *cc, u32 mask, u32 value) +{ + unsigned long flags; + u32 res = 0; + + spin_lock_irqsave(&cc->gpio_lock, flags); + res = chipco_write32_masked(cc, SSB_CHIPCO_GPIOOUTEN, mask, value); + spin_unlock_irqrestore(&cc->gpio_lock, flags); + + return res; +} + +u32 ssb_chipco_gpio_control(struct ssb_chipcommon *cc, u32 mask, u32 value) +{ + unsigned long flags; + u32 res = 0; + + spin_lock_irqsave(&cc->gpio_lock, flags); + res = chipco_write32_masked(cc, SSB_CHIPCO_GPIOCTL, mask, value); + spin_unlock_irqrestore(&cc->gpio_lock, flags); + + return res; +} +EXPORT_SYMBOL(ssb_chipco_gpio_control); + +u32 ssb_chipco_gpio_intmask(struct ssb_chipcommon *cc, u32 mask, u32 value) +{ + unsigned long flags; + u32 res = 0; + + spin_lock_irqsave(&cc->gpio_lock, flags); + res = chipco_write32_masked(cc, SSB_CHIPCO_GPIOIRQ, mask, value); + spin_unlock_irqrestore(&cc->gpio_lock, flags); + + return res; +} + +u32 ssb_chipco_gpio_polarity(struct ssb_chipcommon *cc, u32 mask, u32 value) +{ + unsigned long flags; + u32 res = 0; + + spin_lock_irqsave(&cc->gpio_lock, flags); + res = chipco_write32_masked(cc, SSB_CHIPCO_GPIOPOL, mask, value); + spin_unlock_irqrestore(&cc->gpio_lock, flags); + + return res; +} + +u32 ssb_chipco_gpio_pullup(struct ssb_chipcommon *cc, u32 mask, u32 value) +{ + unsigned long flags; + u32 res = 0; + + if (cc->dev->id.revision < 20) + return 0xffffffff; + + spin_lock_irqsave(&cc->gpio_lock, flags); + res = chipco_write32_masked(cc, SSB_CHIPCO_GPIOPULLUP, mask, value); + spin_unlock_irqrestore(&cc->gpio_lock, flags); + + return res; +} + +u32 ssb_chipco_gpio_pulldown(struct ssb_chipcommon *cc, u32 mask, u32 value) +{ + unsigned long flags; + u32 res = 0; + + if (cc->dev->id.revision < 20) + return 0xffffffff; + + spin_lock_irqsave(&cc->gpio_lock, flags); + res = chipco_write32_masked(cc, SSB_CHIPCO_GPIOPULLDOWN, mask, value); + spin_unlock_irqrestore(&cc->gpio_lock, flags); + + return res; +} + +#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; + unsigned int ccrev = cc->dev->id.revision; + + 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 (ccrev == 20) { + /* BCM5354 uses constant 25MHz clock */ + baud_base = 25000000; + div = 48; + /* Set the override bit so we don't divide it */ + chipco_write32(cc, SSB_CHIPCO_CORECTL, + chipco_read32(cc, SSB_CHIPCO_CORECTL) + | SSB_CHIPCO_CORECTL_UARTCLK0); + } else if ((ccrev >= 11) && (ccrev != 15)) { + baud_base = ssb_chipco_alp_clock(cc); + div = 1; + if (ccrev >= 21) { + /* Turn off UART clock before switching clocksource. */ + chipco_write32(cc, SSB_CHIPCO_CORECTL, + chipco_read32(cc, SSB_CHIPCO_CORECTL) + & ~SSB_CHIPCO_CORECTL_UARTCLKEN); + } + /* Set the override bit so we don't divide it */ + chipco_write32(cc, SSB_CHIPCO_CORECTL, + chipco_read32(cc, SSB_CHIPCO_CORECTL) + | SSB_CHIPCO_CORECTL_UARTCLK0); + if (ccrev >= 21) { + /* Re-enable the UART clock. */ + chipco_write32(cc, SSB_CHIPCO_CORECTL, + chipco_read32(cc, SSB_CHIPCO_CORECTL) + | SSB_CHIPCO_CORECTL_UARTCLKEN); + } + } else if (ccrev >= 3) { + /* Internal backplane clock */ + baud_base = ssb_clockspeed(bus); + div = chipco_read32(cc, SSB_CHIPCO_CLKDIV) + & SSB_CHIPCO_CLKDIV_UART; + } else { + /* Fixed internal backplane clock */ + baud_base = 88000000; + div = 48; + } + + /* Clock source depends on strapping if UartClkOverride is unset */ + if ((ccrev > 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 (ccrev == 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 */ |