/*
* Sonics Silicon Backplane PCI-Hostbus related functions.
*
* Copyright (C) 2005-2006 Michael Buesch <mb@bu3sch.de>
* Copyright (C) 2005 Martin Langer <martin-langer@gmx.de>
* Copyright (C) 2005 Stefano Brivio <st3@riseup.net>
* Copyright (C) 2005 Danny van Dyk <kugelfang@gentoo.org>
* Copyright (C) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch>
*
* Derived from the Broadcom 4400 device driver.
* Copyright (C) 2002 David S. Miller (davem@redhat.com)
* Fixed by Pekka Pietikainen (pp@ee.oulu.fi)
* Copyright (C) 2006 Broadcom Corporation.
*
* 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 <linux/delay.h>
#include "ssb_private.h"
/* Define the following to 1 to enable a printk on each coreswitch. */
#define SSB_VERBOSE_PCICORESWITCH_DEBUG 0
/* Lowlevel coreswitching */
int ssb_pci_switch_coreidx(struct ssb_bus *bus, u8 coreidx)
{
int err;
int attempts = 0;
u32 cur_core;
while (1) {
err = pci_write_config_dword(bus->host_pci, SSB_BAR0_WIN,
(coreidx * SSB_CORE_SIZE)
+ SSB_ENUM_BASE);
if (err)
goto error;
err = pci_read_config_dword(bus->host_pci, SSB_BAR0_WIN,
&cur_core);
if (err)
goto error;
cur_core = (cur_core - SSB_ENUM_BASE)
/ SSB_CORE_SIZE;
if (cur_core == coreidx)
break;
if (attempts++ > SSB_BAR0_MAX_RETRIES)
goto error;
udelay(10);
}
return 0;
error:
ssb_printk(KERN_ERR PFX "Failed to switch to core %u\n", coreidx);
return -ENODEV;
}
int ssb_pci_switch_core(struct ssb_bus *bus,
struct ssb_device *dev)
{
int err;
unsigned long flags;
#if SSB_VERBOSE_PCICORESWITCH_DEBUG
ssb_printk(KERN_INFO PFX
"Switching to %s core, index %d\n",
ssb_core_name(dev->id.coreid),
dev->core_index);
#endif
spin_lock_irqsave(&bus->bar_lock, flags);
err = ssb_pci_switch_coreidx(bus, dev->core_index);
if (!err)
bus->mapped_device = dev;
spin_unlock_irqrestore(&bus->bar_lock, flags);
return err;
}
/* Enable/disable the on board crystal oscillator and/or PLL. */
int ssb_pci_xtal(struct ssb_bus *bus, u32 what, int turn_on)
{
int err;
u32 in, out, outenable;
u16 pci_status;
if (bus->bustype != SSB_BUSTYPE_PCI)
return 0;
err = pci_read_config_dword(bus->host_pci, SSB_GPIO_IN, &in);
if (err)
goto err_pci;
err = pci_read_config_dword(bus->host_pci, SSB_GPIO_OUT, &out);
if (err)
goto err_pci;
err = pci_read_config_dword(bus->host_pci, SSB_GPIO_OUT_ENABLE, &outenable);
if (err)
goto err_pci;
outenable |= what;
if (turn_on) {
/* Avoid glitching the clock if GPRS is already using it.
* We can't actually read the state of the PLLPD so we infer it
* by the value of XTAL_PU which *is* readable via gpioin.
*/
if (!(in & SSB_GPIO_XTAL)) {
if (what & SSB_GPIO_XTAL) {
/* Turn the crystal on */
out |= SSB_GPIO_XTAL;
if (what & SSB_GPIO_PLL)
out |= SSB_GPIO_PLL;
err = pci_write_config_dword(bus->host_pci, SSB_GPIO_OUT, out);
if (err)
goto err_pci;
err = pci_write_config_dword(bus->host_pci, SSB_GPIO_OUT_ENABLE,
outenable);
if (err)
goto err_pci;
msleep(1);
}
if (what & SSB_GPIO_PLL) {
/* Turn the PLL on */
out &= ~SSB_GPIO_PLL;
err = pci_write_config_dword(bus->host_pci, SSB_GPIO_OUT, out);
if (err)
goto err_pci;
msleep(5);
}
}
err = pci_read_config_word(bus->host_pci, PCI_STATUS, &pci_status);
if (err)
goto err_pci;
pci_status &= ~PCI_STATUS_SIG_TARGET_ABORT;
err = pci_write_config_word(bus->host_pci, PCI_STATUS, pci_status);
if (err)
goto err_pci;
} else {
if (what & SSB_GPIO_XTAL) {
/* Turn the crystal off */
out &= ~SSB_GPIO_XTAL;
}
if (what & SSB_GPIO_PLL) {
/* Turn the PLL off */
out |= SSB_GPIO_PLL;
}
err = pci_write_config_dword(bus->host_pci, SSB_GPIO_OUT, out);
if (err)
goto err_pci;
err = pci_write_config_dword(bus->host_pci, SSB_GPIO_OUT_ENABLE, outenable);
if (err)
goto err_pci;
}
out:
return err;
err_pci:
printk(KERN_ERR PFX "Error: ssb_pci_xtal() could not access PCI config space!\n");
err = -EBUSY;
goto out;
}
/* Get the word-offset for a SSB_SPROM_XXX define. */
#define SPOFF(offset) (((offset) - SSB_SPROM_BASE) / sizeof(u16))
/* Helper to extract some _offset, which is one of the SSB_SPROM_XXX defines. */
#define SPEX16(_outvar, _offset, _mask, _shift) \
out->_outvar = ((in[SPOFF(_offset)] & (_mask)) >> (_shift))
#define SPEX32(_outvar, _offset, _mask, _shift) \
out->_outvar = ((((u32)in[SPOFF((_offset)+2)] << 16 | \<