linux/drivers/ssb/main.c
Uwe Kleine-König fc7a6209d5 bus: Make remove callback return void
The driver core ignores the return value of this callback because there
is only little it can do when a device disappears.

This is the final bit of a long lasting cleanup quest where several
buses were converted to also return void from their remove callback.
Additionally some resource leaks were fixed that were caused by drivers
returning an error code in the expectation that the driver won't go
away.

With struct bus_type::remove returning void it's prevented that newly
implemented buses return an ignored error code and so don't anticipate
wrong expectations for driver authors.

Reviewed-by: Tom Rix <trix@redhat.com> (For fpga)
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Cornelia Huck <cohuck@redhat.com> (For drivers/s390 and drivers/vfio)
Acked-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> (For ARM, Amba and related parts)
Acked-by: Mark Brown <broonie@kernel.org>
Acked-by: Chen-Yu Tsai <wens@csie.org> (for sunxi-rsb)
Acked-by: Pali Rohár <pali@kernel.org>
Acked-by: Mauro Carvalho Chehab <mchehab@kernel.org> (for media)
Acked-by: Hans de Goede <hdegoede@redhat.com> (For drivers/platform)
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-By: Vinod Koul <vkoul@kernel.org>
Acked-by: Juergen Gross <jgross@suse.com> (For xen)
Acked-by: Lee Jones <lee.jones@linaro.org> (For mfd)
Acked-by: Johannes Thumshirn <jth@kernel.org> (For mcb)
Acked-by: Johan Hovold <johan@kernel.org>
Acked-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> (For slimbus)
Acked-by: Kirti Wankhede <kwankhede@nvidia.com> (For vfio)
Acked-by: Maximilian Luz <luzmaximilian@gmail.com>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> (For ulpi and typec)
Acked-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com> (For ipack)
Acked-by: Geoff Levand <geoff@infradead.org> (For ps3)
Acked-by: Yehezkel Bernat <YehezkelShB@gmail.com> (For thunderbolt)
Acked-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> (For intel_th)
Acked-by: Dominik Brodowski <linux@dominikbrodowski.net> (For pcmcia)
Acked-by: Rafael J. Wysocki <rafael@kernel.org> (For ACPI)
Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org> (rpmsg and apr)
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> (For intel-ish-hid)
Acked-by: Dan Williams <dan.j.williams@intel.com> (For CXL, DAX, and NVDIMM)
Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com> (For isa)
Acked-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (For firewire)
Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> (For hid)
Acked-by: Thorsten Scherer <t.scherer@eckelmann.de> (For siox)
Acked-by: Sven Van Asbroeck <TheSven73@gmail.com> (For anybuss)
Acked-by: Ulf Hansson <ulf.hansson@linaro.org> (For MMC)
Acked-by: Wolfram Sang <wsa@kernel.org> # for I2C
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Finn Thain <fthain@linux-m68k.org>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20210713193522.1770306-6-u.kleine-koenig@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-07-21 11:53:42 +02:00

1340 lines
30 KiB
C

/*
* Sonics Silicon Backplane
* Subsystem core
*
* Copyright 2005, Broadcom Corporation
* Copyright 2006, 2007, Michael Buesch <m@bues.ch>
*
* Licensed under the GNU/GPL. See COPYING for details.
*/
#include "ssb_private.h"
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/ssb/ssb.h>
#include <linux/ssb/ssb_regs.h>
#include <linux/ssb/ssb_driver_gige.h>
#include <linux/dma-mapping.h>
#include <linux/pci.h>
#include <linux/mmc/sdio_func.h>
#include <linux/slab.h>
#include <pcmcia/cistpl.h>
#include <pcmcia/ds.h>
MODULE_DESCRIPTION("Sonics Silicon Backplane driver");
MODULE_LICENSE("GPL");
/* Temporary list of yet-to-be-attached buses */
static LIST_HEAD(attach_queue);
/* List if running buses */
static LIST_HEAD(buses);
/* Software ID counter */
static unsigned int next_busnumber;
/* buses_mutes locks the two buslists and the next_busnumber.
* Don't lock this directly, but use ssb_buses_[un]lock() below.
*/
static DEFINE_MUTEX(buses_mutex);
/* There are differences in the codeflow, if the bus is
* initialized from early boot, as various needed services
* are not available early. This is a mechanism to delay
* these initializations to after early boot has finished.
* It's also used to avoid mutex locking, as that's not
* available and needed early.
*/
static bool ssb_is_early_boot = 1;
static void ssb_buses_lock(void);
static void ssb_buses_unlock(void);
#ifdef CONFIG_SSB_PCIHOST
struct ssb_bus *ssb_pci_dev_to_bus(struct pci_dev *pdev)
{
struct ssb_bus *bus;
ssb_buses_lock();
list_for_each_entry(bus, &buses, list) {
if (bus->bustype == SSB_BUSTYPE_PCI &&
bus->host_pci == pdev)
goto found;
}
bus = NULL;
found:
ssb_buses_unlock();
return bus;
}
#endif /* CONFIG_SSB_PCIHOST */
#ifdef CONFIG_SSB_PCMCIAHOST
struct ssb_bus *ssb_pcmcia_dev_to_bus(struct pcmcia_device *pdev)
{
struct ssb_bus *bus;
ssb_buses_lock();
list_for_each_entry(bus, &buses, list) {
if (bus->bustype == SSB_BUSTYPE_PCMCIA &&
bus->host_pcmcia == pdev)
goto found;
}
bus = NULL;
found:
ssb_buses_unlock();
return bus;
}
#endif /* CONFIG_SSB_PCMCIAHOST */
int ssb_for_each_bus_call(unsigned long data,
int (*func)(struct ssb_bus *bus, unsigned long data))
{
struct ssb_bus *bus;
int res;
ssb_buses_lock();
list_for_each_entry(bus, &buses, list) {
res = func(bus, data);
if (res >= 0) {
ssb_buses_unlock();
return res;
}
}
ssb_buses_unlock();
return -ENODEV;
}
static struct ssb_device *ssb_device_get(struct ssb_device *dev)
{
if (dev)
get_device(dev->dev);
return dev;
}
static void ssb_device_put(struct ssb_device *dev)
{
if (dev)
put_device(dev->dev);
}
static int ssb_device_resume(struct device *dev)
{
struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
struct ssb_driver *ssb_drv;
int err = 0;
if (dev->driver) {
ssb_drv = drv_to_ssb_drv(dev->driver);
if (ssb_drv && ssb_drv->resume)
err = ssb_drv->resume(ssb_dev);
if (err)
goto out;
}
out:
return err;
}
static int ssb_device_suspend(struct device *dev, pm_message_t state)
{
struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
struct ssb_driver *ssb_drv;
int err = 0;
if (dev->driver) {
ssb_drv = drv_to_ssb_drv(dev->driver);
if (ssb_drv && ssb_drv->suspend)
err = ssb_drv->suspend(ssb_dev, state);
if (err)
goto out;
}
out:
return err;
}
int ssb_bus_resume(struct ssb_bus *bus)
{
int err;
/* Reset HW state information in memory, so that HW is
* completely reinitialized.
*/
bus->mapped_device = NULL;
#ifdef CONFIG_SSB_DRIVER_PCICORE
bus->pcicore.setup_done = 0;
#endif
err = ssb_bus_powerup(bus, 0);
if (err)
return err;
err = ssb_pcmcia_hardware_setup(bus);
if (err) {
ssb_bus_may_powerdown(bus);
return err;
}
ssb_chipco_resume(&bus->chipco);
ssb_bus_may_powerdown(bus);
return 0;
}
EXPORT_SYMBOL(ssb_bus_resume);
int ssb_bus_suspend(struct ssb_bus *bus)
{
ssb_chipco_suspend(&bus->chipco);
ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 0);
return 0;
}
EXPORT_SYMBOL(ssb_bus_suspend);
#ifdef CONFIG_SSB_SPROM
/** ssb_devices_freeze - Freeze all devices on the bus.
*
* After freezing no device driver will be handling a device
* on this bus anymore. ssb_devices_thaw() must be called after
* a successful freeze to reactivate the devices.
*
* @bus: The bus.
* @ctx: Context structure. Pass this to ssb_devices_thaw().
*/
int ssb_devices_freeze(struct ssb_bus *bus, struct ssb_freeze_context *ctx)
{
struct ssb_device *sdev;
struct ssb_driver *sdrv;
unsigned int i;
memset(ctx, 0, sizeof(*ctx));
ctx->bus = bus;
WARN_ON(bus->nr_devices > ARRAY_SIZE(ctx->device_frozen));
for (i = 0; i < bus->nr_devices; i++) {
sdev = ssb_device_get(&bus->devices[i]);
if (!sdev->dev || !sdev->dev->driver ||
!device_is_registered(sdev->dev)) {
ssb_device_put(sdev);
continue;
}
sdrv = drv_to_ssb_drv(sdev->dev->driver);
if (WARN_ON(!sdrv->remove))
continue;
sdrv->remove(sdev);
ctx->device_frozen[i] = 1;
}
return 0;
}
/** ssb_devices_thaw - Unfreeze all devices on the bus.
*
* This will re-attach the device drivers and re-init the devices.
*
* @ctx: The context structure from ssb_devices_freeze()
*/
int ssb_devices_thaw(struct ssb_freeze_context *ctx)
{
struct ssb_bus *bus = ctx->bus;
struct ssb_device *sdev;
struct ssb_driver *sdrv;
unsigned int i;
int err, result = 0;
for (i = 0; i < bus->nr_devices; i++) {
if (!ctx->device_frozen[i])
continue;
sdev = &bus->devices[i];
if (WARN_ON(!sdev->dev || !sdev->dev->driver))
continue;
sdrv = drv_to_ssb_drv(sdev->dev->driver);
if (WARN_ON(!sdrv || !sdrv->probe))
continue;
err = sdrv->probe(sdev, &sdev->id);
if (err) {
dev_err(sdev->dev,
"Failed to thaw device %s\n",
dev_name(sdev->dev));
result = err;
}
ssb_device_put(sdev);
}
return result;
}
#endif /* CONFIG_SSB_SPROM */
static void ssb_device_shutdown(struct device *dev)
{
struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
struct ssb_driver *ssb_drv;
if (!dev->driver)
return;
ssb_drv = drv_to_ssb_drv(dev->driver);
if (ssb_drv && ssb_drv->shutdown)
ssb_drv->shutdown(ssb_dev);
}
static void ssb_device_remove(struct device *dev)
{
struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
struct ssb_driver *ssb_drv = drv_to_ssb_drv(dev->driver);
if (ssb_drv && ssb_drv->remove)
ssb_drv->remove(ssb_dev);
ssb_device_put(ssb_dev);
}
static int ssb_device_probe(struct device *dev)
{
struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
struct ssb_driver *ssb_drv = drv_to_ssb_drv(dev->driver);
int err = 0;
ssb_device_get(ssb_dev);
if (ssb_drv && ssb_drv->probe)
err = ssb_drv->probe(ssb_dev, &ssb_dev->id);
if (err)
ssb_device_put(ssb_dev);
return err;
}
static int ssb_match_devid(const struct ssb_device_id *tabid,
const struct ssb_device_id *devid)
{
if ((tabid->vendor != devid->vendor) &&
tabid->vendor != SSB_ANY_VENDOR)
return 0;
if ((tabid->coreid != devid->coreid) &&
tabid->coreid != SSB_ANY_ID)
return 0;
if ((tabid->revision != devid->revision) &&
tabid->revision != SSB_ANY_REV)
return 0;
return 1;
}
static int ssb_bus_match(struct device *dev, struct device_driver *drv)
{
struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
struct ssb_driver *ssb_drv = drv_to_ssb_drv(drv);
const struct ssb_device_id *id;
for (id = ssb_drv->id_table;
id->vendor || id->coreid || id->revision;
id++) {
if (ssb_match_devid(id, &ssb_dev->id))
return 1; /* found */
}
return 0;
}
static int ssb_device_uevent(struct device *dev, struct kobj_uevent_env *env)
{
struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
if (!dev)
return -ENODEV;
return add_uevent_var(env,
"MODALIAS=ssb:v%04Xid%04Xrev%02X",
ssb_dev->id.vendor, ssb_dev->id.coreid,
ssb_dev->id.revision);
}
#define ssb_config_attr(attrib, field, format_string) \
static ssize_t \
attrib##_show(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
return sprintf(buf, format_string, dev_to_ssb_dev(dev)->field); \
} \
static DEVICE_ATTR_RO(attrib);
ssb_config_attr(core_num, core_index, "%u\n")
ssb_config_attr(coreid, id.coreid, "0x%04x\n")
ssb_config_attr(vendor, id.vendor, "0x%04x\n")
ssb_config_attr(revision, id.revision, "%u\n")
ssb_config_attr(irq, irq, "%u\n")
static ssize_t
name_show(struct device *dev, struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%s\n",
ssb_core_name(dev_to_ssb_dev(dev)->id.coreid));
}
static DEVICE_ATTR_RO(name);
static struct attribute *ssb_device_attrs[] = {
&dev_attr_name.attr,
&dev_attr_core_num.attr,
&dev_attr_coreid.attr,
&dev_attr_vendor.attr,
&dev_attr_revision.attr,
&dev_attr_irq.attr,
NULL,
};
ATTRIBUTE_GROUPS(ssb_device);
static struct bus_type ssb_bustype = {
.name = "ssb",
.match = ssb_bus_match,
.probe = ssb_device_probe,
.remove = ssb_device_remove,
.shutdown = ssb_device_shutdown,
.suspend = ssb_device_suspend,
.resume = ssb_device_resume,
.uevent = ssb_device_uevent,
.dev_groups = ssb_device_groups,
};
static void ssb_buses_lock(void)
{
/* See the comment at the ssb_is_early_boot definition */
if (!ssb_is_early_boot)
mutex_lock(&buses_mutex);
}
static void ssb_buses_unlock(void)
{
/* See the comment at the ssb_is_early_boot definition */
if (!ssb_is_early_boot)
mutex_unlock(&buses_mutex);
}
static void ssb_devices_unregister(struct ssb_bus *bus)
{
struct ssb_device *sdev;
int i;
for (i = bus->nr_devices - 1; i >= 0; i--) {
sdev = &(bus->devices[i]);
if (sdev->dev)
device_unregister(sdev->dev);
}
#ifdef CONFIG_SSB_EMBEDDED
if (bus->bustype == SSB_BUSTYPE_SSB)
platform_device_unregister(bus->watchdog);
#endif
}
void ssb_bus_unregister(struct ssb_bus *bus)
{
int err;
err = ssb_gpio_unregister(bus);
if (err)
pr_debug("Can not unregister GPIO driver: %i\n", err);
ssb_buses_lock();
ssb_devices_unregister(bus);
list_del(&bus->list);
ssb_buses_unlock();
ssb_pcmcia_exit(bus);
ssb_pci_exit(bus);
ssb_iounmap(bus);
}
EXPORT_SYMBOL(ssb_bus_unregister);
static void ssb_release_dev(struct device *dev)
{
struct __ssb_dev_wrapper *devwrap;
devwrap = container_of(dev, struct __ssb_dev_wrapper, dev);
kfree(devwrap);
}
static int ssb_devices_register(struct ssb_bus *bus)
{
struct ssb_device *sdev;
struct device *dev;
struct __ssb_dev_wrapper *devwrap;
int i, err = 0;
int dev_idx = 0;
for (i = 0; i < bus->nr_devices; i++) {
sdev = &(bus->devices[i]);
/* We don't register SSB-system devices to the kernel,
* as the drivers for them are built into SSB.
*/
switch (sdev->id.coreid) {
case SSB_DEV_CHIPCOMMON:
case SSB_DEV_PCI:
case SSB_DEV_PCIE:
case SSB_DEV_PCMCIA:
case SSB_DEV_MIPS:
case SSB_DEV_MIPS_3302:
case SSB_DEV_EXTIF:
continue;
}
devwrap = kzalloc(sizeof(*devwrap), GFP_KERNEL);
if (!devwrap) {
err = -ENOMEM;
goto error;
}
dev = &devwrap->dev;
devwrap->sdev = sdev;
dev->release = ssb_release_dev;
dev->bus = &ssb_bustype;
dev_set_name(dev, "ssb%u:%d", bus->busnumber, dev_idx);
switch (bus->bustype) {
case SSB_BUSTYPE_PCI:
#ifdef CONFIG_SSB_PCIHOST
sdev->irq = bus->host_pci->irq;
dev->parent = &bus->host_pci->dev;
sdev->dma_dev = dev->parent;
#endif
break;
case SSB_BUSTYPE_PCMCIA:
#ifdef CONFIG_SSB_PCMCIAHOST
sdev->irq = bus->host_pcmcia->irq;
dev->parent = &bus->host_pcmcia->dev;
#endif
break;
case SSB_BUSTYPE_SDIO:
#ifdef CONFIG_SSB_SDIOHOST
dev->parent = &bus->host_sdio->dev;
#endif
break;
case SSB_BUSTYPE_SSB:
dev->dma_mask = &dev->coherent_dma_mask;
sdev->dma_dev = dev;
break;
}
sdev->dev = dev;
err = device_register(dev);
if (err) {
pr_err("Could not register %s\n", dev_name(dev));
/* Set dev to NULL to not unregister
* dev on error unwinding.
*/
sdev->dev = NULL;
put_device(dev);
goto error;
}
dev_idx++;
}
#ifdef CONFIG_SSB_DRIVER_MIPS
if (bus->mipscore.pflash.present) {
err = platform_device_register(&ssb_pflash_dev);
if (err)
pr_err("Error registering parallel flash\n");
}
#endif
#ifdef CONFIG_SSB_SFLASH
if (bus->mipscore.sflash.present) {
err = platform_device_register(&ssb_sflash_dev);
if (err)
pr_err("Error registering serial flash\n");
}
#endif
return 0;
error:
/* Unwind the already registered devices. */
ssb_devices_unregister(bus);
return err;
}
/* Needs ssb_buses_lock() */
static int ssb_attach_queued_buses(void)
{
struct ssb_bus *bus, *n;
int err = 0;
int drop_them_all = 0;
list_for_each_entry_safe(bus, n, &attach_queue, list) {
if (drop_them_all) {
list_del(&bus->list);
continue;
}
/* Can't init the PCIcore in ssb_bus_register(), as that
* is too early in boot for embedded systems
* (no udelay() available). So do it here in attach stage.
*/
err = ssb_bus_powerup(bus, 0);
if (err)
goto error;
ssb_pcicore_init(&bus->pcicore);
if (bus->bustype == SSB_BUSTYPE_SSB)
ssb_watchdog_register(bus);
err = ssb_gpio_init(bus);
if (err == -ENOTSUPP)
pr_debug("GPIO driver not activated\n");
else if (err)
pr_debug("Error registering GPIO driver: %i\n", err);
ssb_bus_may_powerdown(bus);
err = ssb_devices_register(bus);
error:
if (err) {
drop_them_all = 1;
list_del(&bus->list);
continue;
}
list_move_tail(&bus->list, &buses);
}
return err;
}
static int ssb_fetch_invariants(struct ssb_bus *bus,
ssb_invariants_func_t get_invariants)
{
struct ssb_init_invariants iv;
int err;
memset(&iv, 0, sizeof(iv));
err = get_invariants(bus, &iv);
if (err)
goto out;
memcpy(&bus->boardinfo, &iv.boardinfo, sizeof(iv.boardinfo));
memcpy(&bus->sprom, &iv.sprom, sizeof(iv.sprom));
bus->has_cardbus_slot = iv.has_cardbus_slot;
out:
return err;
}
static int __maybe_unused
ssb_bus_register(struct ssb_bus *bus,
ssb_invariants_func_t get_invariants,
unsigned long baseaddr)
{
int err;
spin_lock_init(&bus->bar_lock);
INIT_LIST_HEAD(&bus->list);
#ifdef CONFIG_SSB_EMBEDDED
spin_lock_init(&bus->gpio_lock);
#endif
/* Powerup the bus */
err = ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 1);
if (err)
goto out;
/* Init SDIO-host device (if any), before the scan */
err = ssb_sdio_init(bus);
if (err)
goto err_disable_xtal;
ssb_buses_lock();
bus->busnumber = next_busnumber;
/* Scan for devices (cores) */
err = ssb_bus_scan(bus, baseaddr);
if (err)
goto err_sdio_exit;
/* Init PCI-host device (if any) */
err = ssb_pci_init(bus);
if (err)
goto err_unmap;
/* Init PCMCIA-host device (if any) */
err = ssb_pcmcia_init(bus);
if (err)
goto err_pci_exit;
/* Initialize basic system devices (if available) */
err = ssb_bus_powerup(bus, 0);
if (err)
goto err_pcmcia_exit;
ssb_chipcommon_init(&bus->chipco);
ssb_extif_init(&bus->extif);
ssb_mipscore_init(&bus->mipscore);
err = ssb_fetch_invariants(bus, get_invariants);
if (err) {
ssb_bus_may_powerdown(bus);
goto err_pcmcia_exit;
}
ssb_bus_may_powerdown(bus);
/* Queue it for attach.
* See the comment at the ssb_is_early_boot definition.
*/
list_add_tail(&bus->list, &attach_queue);
if (!ssb_is_early_boot) {
/* This is not early boot, so we must attach the bus now */
err = ssb_attach_queued_buses();
if (err)
goto err_dequeue;
}
next_busnumber++;
ssb_buses_unlock();
out:
return err;
err_dequeue:
list_del(&bus->list);
err_pcmcia_exit:
ssb_pcmcia_exit(bus);
err_pci_exit:
ssb_pci_exit(bus);
err_unmap:
ssb_iounmap(bus);
err_sdio_exit:
ssb_sdio_exit(bus);
err_disable_xtal:
ssb_buses_unlock();
ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 0);
return err;
}
#ifdef CONFIG_SSB_PCIHOST
int ssb_bus_pcibus_register(struct ssb_bus *bus, struct pci_dev *host_pci)
{
int err;
bus->bustype = SSB_BUSTYPE_PCI;
bus->host_pci = host_pci;
bus->ops = &ssb_pci_ops;
err = ssb_bus_register(bus, ssb_pci_get_invariants, 0);
if (!err) {
dev_info(&host_pci->dev,
"Sonics Silicon Backplane found on PCI device %s\n",
dev_name(&host_pci->dev));
} else {
dev_err(&host_pci->dev,
"Failed to register PCI version of SSB with error %d\n",
err);
}
return err;
}
#endif /* CONFIG_SSB_PCIHOST */
#ifdef CONFIG_SSB_PCMCIAHOST
int ssb_bus_pcmciabus_register(struct ssb_bus *bus,
struct pcmcia_device *pcmcia_dev,
unsigned long baseaddr)
{
int err;
bus->bustype = SSB_BUSTYPE_PCMCIA;
bus->host_pcmcia = pcmcia_dev;
bus->ops = &ssb_pcmcia_ops;
err = ssb_bus_register(bus, ssb_pcmcia_get_invariants, baseaddr);
if (!err) {
dev_info(&pcmcia_dev->dev,
"Sonics Silicon Backplane found on PCMCIA device %s\n",
pcmcia_dev->devname);
}
return err;
}
#endif /* CONFIG_SSB_PCMCIAHOST */
#ifdef CONFIG_SSB_SDIOHOST
int ssb_bus_sdiobus_register(struct ssb_bus *bus, struct sdio_func *func,
unsigned int quirks)
{
int err;
bus->bustype = SSB_BUSTYPE_SDIO;
bus->host_sdio = func;
bus->ops = &ssb_sdio_ops;
bus->quirks = quirks;
err = ssb_bus_register(bus, ssb_sdio_get_invariants, ~0);
if (!err) {
dev_info(&func->dev,
"Sonics Silicon Backplane found on SDIO device %s\n",
sdio_func_id(func));
}
return err;
}
EXPORT_SYMBOL(ssb_bus_sdiobus_register);
#endif /* CONFIG_SSB_PCMCIAHOST */
#ifdef CONFIG_SSB_HOST_SOC
int ssb_bus_host_soc_register(struct ssb_bus *bus, unsigned long baseaddr)
{
int err;
bus->bustype = SSB_BUSTYPE_SSB;
bus->ops = &ssb_host_soc_ops;
err = ssb_bus_register(bus, ssb_host_soc_get_invariants, baseaddr);
if (!err) {
pr_info("Sonics Silicon Backplane found at address 0x%08lX\n",
baseaddr);
}
return err;
}
#endif
int __ssb_driver_register(struct ssb_driver *drv, struct module *owner)
{
drv->drv.name = drv->name;
drv->drv.bus = &ssb_bustype;
drv->drv.owner = owner;
return driver_register(&drv->drv);
}
EXPORT_SYMBOL(__ssb_driver_register);
void ssb_driver_unregister(struct ssb_driver *drv)
{
driver_unregister(&drv->drv);
}
EXPORT_SYMBOL(ssb_driver_unregister);
void ssb_set_devtypedata(struct ssb_device *dev, void *data)
{
struct ssb_bus *bus = dev->bus;
struct ssb_device *ent;
int i;
for (i = 0; i < bus->nr_devices; i++) {
ent = &(bus->devices[i]);
if (ent->id.vendor != dev->id.vendor)
continue;
if (ent->id.coreid != dev->id.coreid)
continue;
ent->devtypedata = data;
}
}
EXPORT_SYMBOL(ssb_set_devtypedata);
static u32 clkfactor_f6_resolve(u32 v)
{
/* map the magic values */
switch (v) {
case SSB_CHIPCO_CLK_F6_2:
return 2;
case SSB_CHIPCO_CLK_F6_3:
return 3;
case SSB_CHIPCO_CLK_F6_4:
return 4;
case SSB_CHIPCO_CLK_F6_5:
return 5;
case SSB_CHIPCO_CLK_F6_6:
return 6;
case SSB_CHIPCO_CLK_F6_7:
return 7;
}
return 0;
}
/* Calculate the speed the backplane would run at a given set of clockcontrol values */
u32 ssb_calc_clock_rate(u32 plltype, u32 n, u32 m)
{
u32 n1, n2, clock, m1, m2, m3, mc;
n1 = (n & SSB_CHIPCO_CLK_N1);
n2 = ((n & SSB_CHIPCO_CLK_N2) >> SSB_CHIPCO_CLK_N2_SHIFT);
switch (plltype) {
case SSB_PLLTYPE_6: /* 100/200 or 120/240 only */
if (m & SSB_CHIPCO_CLK_T6_MMASK)
return SSB_CHIPCO_CLK_T6_M1;
return SSB_CHIPCO_CLK_T6_M0;
case SSB_PLLTYPE_1: /* 48Mhz base, 3 dividers */
case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
case SSB_PLLTYPE_4: /* 48Mhz, 4 dividers */
case SSB_PLLTYPE_7: /* 25Mhz, 4 dividers */
n1 = clkfactor_f6_resolve(n1);
n2 += SSB_CHIPCO_CLK_F5_BIAS;
break;
case SSB_PLLTYPE_2: /* 48Mhz, 4 dividers */
n1 += SSB_CHIPCO_CLK_T2_BIAS;
n2 += SSB_CHIPCO_CLK_T2_BIAS;
WARN_ON(!((n1 >= 2) && (n1 <= 7)));
WARN_ON(!((n2 >= 5) && (n2 <= 23)));
break;
case SSB_PLLTYPE_5: /* 25Mhz, 4 dividers */
return 100000000;
default:
WARN_ON(1);
}
switch (plltype) {
case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
case SSB_PLLTYPE_7: /* 25Mhz, 4 dividers */
clock = SSB_CHIPCO_CLK_BASE2 * n1 * n2;
break;
default:
clock = SSB_CHIPCO_CLK_BASE1 * n1 * n2;
}
if (!clock)
return 0;
m1 = (m & SSB_CHIPCO_CLK_M1);
m2 = ((m & SSB_CHIPCO_CLK_M2) >> SSB_CHIPCO_CLK_M2_SHIFT);
m3 = ((m & SSB_CHIPCO_CLK_M3) >> SSB_CHIPCO_CLK_M3_SHIFT);
mc = ((m & SSB_CHIPCO_CLK_MC) >> SSB_CHIPCO_CLK_MC_SHIFT);
switch (plltype) {
case SSB_PLLTYPE_1: /* 48Mhz base, 3 dividers */
case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
case SSB_PLLTYPE_4: /* 48Mhz, 4 dividers */
case SSB_PLLTYPE_7: /* 25Mhz, 4 dividers */
m1 = clkfactor_f6_resolve(m1);
if ((plltype == SSB_PLLTYPE_1) ||
(plltype == SSB_PLLTYPE_3))
m2 += SSB_CHIPCO_CLK_F5_BIAS;
else
m2 = clkfactor_f6_resolve(m2);
m3 = clkfactor_f6_resolve(m3);
switch (mc) {
case SSB_CHIPCO_CLK_MC_BYPASS:
return clock;
case SSB_CHIPCO_CLK_MC_M1:
return (clock / m1);
case SSB_CHIPCO_CLK_MC_M1M2:
return (clock / (m1 * m2));
case SSB_CHIPCO_CLK_MC_M1M2M3:
return (clock / (m1 * m2 * m3));
case SSB_CHIPCO_CLK_MC_M1M3:
return (clock / (m1 * m3));
}
return 0;
case SSB_PLLTYPE_2:
m1 += SSB_CHIPCO_CLK_T2_BIAS;
m2 += SSB_CHIPCO_CLK_T2M2_BIAS;
m3 += SSB_CHIPCO_CLK_T2_BIAS;
WARN_ON(!((m1 >= 2) && (m1 <= 7)));
WARN_ON(!((m2 >= 3) && (m2 <= 10)));
WARN_ON(!((m3 >= 2) && (m3 <= 7)));
if (!(mc & SSB_CHIPCO_CLK_T2MC_M1BYP))
clock /= m1;
if (!(mc & SSB_CHIPCO_CLK_T2MC_M2BYP))
clock /= m2;
if (!(mc & SSB_CHIPCO_CLK_T2MC_M3BYP))
clock /= m3;
return clock;
default:
WARN_ON(1);
}
return 0;
}
/* Get the current speed the backplane is running at */
u32 ssb_clockspeed(struct ssb_bus *bus)
{
u32 rate;
u32 plltype;
u32 clkctl_n, clkctl_m;
if (bus->chipco.capabilities & SSB_CHIPCO_CAP_PMU)
return ssb_pmu_get_controlclock(&bus->chipco);
if (ssb_extif_available(&bus->extif))
ssb_extif_get_clockcontrol(&bus->extif, &plltype,
&clkctl_n, &clkctl_m);
else if (bus->chipco.dev)
ssb_chipco_get_clockcontrol(&bus->chipco, &plltype,
&clkctl_n, &clkctl_m);
else
return 0;
if (bus->chip_id == 0x5365) {
rate = 100000000;
} else {
rate = ssb_calc_clock_rate(plltype, clkctl_n, clkctl_m);
if (plltype == SSB_PLLTYPE_3) /* 25Mhz, 2 dividers */
rate /= 2;
}
return rate;
}
EXPORT_SYMBOL(ssb_clockspeed);
static u32 ssb_tmslow_reject_bitmask(struct ssb_device *dev)
{
u32 rev = ssb_read32(dev, SSB_IDLOW) & SSB_IDLOW_SSBREV;
/* The REJECT bit seems to be different for Backplane rev 2.3 */
switch (rev) {
case SSB_IDLOW_SSBREV_22:
case SSB_IDLOW_SSBREV_24:
case SSB_IDLOW_SSBREV_26:
return SSB_TMSLOW_REJECT;
case SSB_IDLOW_SSBREV_23:
return SSB_TMSLOW_REJECT_23;
case SSB_IDLOW_SSBREV_25: /* TODO - find the proper REJECT bit */
case SSB_IDLOW_SSBREV_27: /* same here */
return SSB_TMSLOW_REJECT; /* this is a guess */
case SSB_IDLOW_SSBREV:
break;
default:
WARN(1, KERN_INFO "ssb: Backplane Revision 0x%.8X\n", rev);
}
return (SSB_TMSLOW_REJECT | SSB_TMSLOW_REJECT_23);
}
int ssb_device_is_enabled(struct ssb_device *dev)
{
u32 val;
u32 reject;
reject = ssb_tmslow_reject_bitmask(dev);
val = ssb_read32(dev, SSB_TMSLOW);
val &= SSB_TMSLOW_CLOCK | SSB_TMSLOW_RESET | reject;
return (val == SSB_TMSLOW_CLOCK);
}
EXPORT_SYMBOL(ssb_device_is_enabled);
static void ssb_flush_tmslow(struct ssb_device *dev)
{
/* Make _really_ sure the device has finished the TMSLOW
* register write transaction, as we risk running into
* a machine check exception otherwise.
* Do this by reading the register back to commit the
* PCI write and delay an additional usec for the device
* to react to the change.
*/
ssb_read32(dev, SSB_TMSLOW);
udelay(1);
}
void ssb_device_enable(struct ssb_device *dev, u32 core_specific_flags)
{
u32 val;
ssb_device_disable(dev, core_specific_flags);
ssb_write32(dev, SSB_TMSLOW,
SSB_TMSLOW_RESET | SSB_TMSLOW_CLOCK |
SSB_TMSLOW_FGC | core_specific_flags);
ssb_flush_tmslow(dev);
/* Clear SERR if set. This is a hw bug workaround. */
if (ssb_read32(dev, SSB_TMSHIGH) & SSB_TMSHIGH_SERR)
ssb_write32(dev, SSB_TMSHIGH, 0);
val = ssb_read32(dev, SSB_IMSTATE);
if (val & (SSB_IMSTATE_IBE | SSB_IMSTATE_TO)) {
val &= ~(SSB_IMSTATE_IBE | SSB_IMSTATE_TO);
ssb_write32(dev, SSB_IMSTATE, val);
}
ssb_write32(dev, SSB_TMSLOW,
SSB_TMSLOW_CLOCK | SSB_TMSLOW_FGC |
core_specific_flags);
ssb_flush_tmslow(dev);
ssb_write32(dev, SSB_TMSLOW, SSB_TMSLOW_CLOCK |
core_specific_flags);
ssb_flush_tmslow(dev);
}
EXPORT_SYMBOL(ssb_device_enable);
/* Wait for bitmask in a register to get set or cleared.
* timeout is in units of ten-microseconds
*/
static int ssb_wait_bits(struct ssb_device *dev, u16 reg, u32 bitmask,
int timeout, int set)
{
int i;
u32 val;
for (i = 0; i < timeout; i++) {
val = ssb_read32(dev, reg);
if (set) {
if ((val & bitmask) == bitmask)
return 0;
} else {
if (!(val & bitmask))
return 0;
}
udelay(10);
}
dev_err(dev->dev,
"Timeout waiting for bitmask %08X on register %04X to %s\n",
bitmask, reg, set ? "set" : "clear");
return -ETIMEDOUT;
}
void ssb_device_disable(struct ssb_device *dev, u32 core_specific_flags)
{
u32 reject, val;
if (ssb_read32(dev, SSB_TMSLOW) & SSB_TMSLOW_RESET)
return;
reject = ssb_tmslow_reject_bitmask(dev);
if (ssb_read32(dev, SSB_TMSLOW) & SSB_TMSLOW_CLOCK) {
ssb_write32(dev, SSB_TMSLOW, reject | SSB_TMSLOW_CLOCK);
ssb_wait_bits(dev, SSB_TMSLOW, reject, 1000, 1);
ssb_wait_bits(dev, SSB_TMSHIGH, SSB_TMSHIGH_BUSY, 1000, 0);
if (ssb_read32(dev, SSB_IDLOW) & SSB_IDLOW_INITIATOR) {
val = ssb_read32(dev, SSB_IMSTATE);
val |= SSB_IMSTATE_REJECT;
ssb_write32(dev, SSB_IMSTATE, val);
ssb_wait_bits(dev, SSB_IMSTATE, SSB_IMSTATE_BUSY, 1000,
0);
}
ssb_write32(dev, SSB_TMSLOW,
SSB_TMSLOW_FGC | SSB_TMSLOW_CLOCK |
reject | SSB_TMSLOW_RESET |
core_specific_flags);
ssb_flush_tmslow(dev);
if (ssb_read32(dev, SSB_IDLOW) & SSB_IDLOW_INITIATOR) {
val = ssb_read32(dev, SSB_IMSTATE);
val &= ~SSB_IMSTATE_REJECT;
ssb_write32(dev, SSB_IMSTATE, val);
}
}
ssb_write32(dev, SSB_TMSLOW,
reject | SSB_TMSLOW_RESET |
core_specific_flags);
ssb_flush_tmslow(dev);
}
EXPORT_SYMBOL(ssb_device_disable);
/* Some chipsets need routing known for PCIe and 64-bit DMA */
static bool ssb_dma_translation_special_bit(struct ssb_device *dev)
{
u16 chip_id = dev->bus->chip_id;
if (dev->id.coreid == SSB_DEV_80211) {
return (chip_id == 0x4322 || chip_id == 43221 ||
chip_id == 43231 || chip_id == 43222);
}
return false;
}
u32 ssb_dma_translation(struct ssb_device *dev)
{
switch (dev->bus->bustype) {
case SSB_BUSTYPE_SSB:
return 0;
case SSB_BUSTYPE_PCI:
if (pci_is_pcie(dev->bus->host_pci) &&
ssb_read32(dev, SSB_TMSHIGH) & SSB_TMSHIGH_DMA64) {
return SSB_PCIE_DMA_H32;
} else {
if (ssb_dma_translation_special_bit(dev))
return SSB_PCIE_DMA_H32;
else
return SSB_PCI_DMA;
}
default:
__ssb_dma_not_implemented(dev);
}
return 0;
}
EXPORT_SYMBOL(ssb_dma_translation);
int ssb_bus_may_powerdown(struct ssb_bus *bus)
{
struct ssb_chipcommon *cc;
int err = 0;
/* On buses where more than one core may be working
* at a time, we must not powerdown stuff if there are
* still cores that may want to run.
*/
if (bus->bustype == SSB_BUSTYPE_SSB)
goto out;
cc = &bus->chipco;
if (!cc->dev)
goto out;
if (cc->dev->id.revision < 5)
goto out;
ssb_chipco_set_clockmode(cc, SSB_CLKMODE_SLOW);
err = ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 0);
if (err)
goto error;
out:
bus->powered_up = 0;
return err;
error:
pr_err("Bus powerdown failed\n");
goto out;
}
EXPORT_SYMBOL(ssb_bus_may_powerdown);
int ssb_bus_powerup(struct ssb_bus *bus, bool dynamic_pctl)
{
int err;
enum ssb_clkmode mode;
err = ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 1);
if (err)
goto error;
bus->powered_up = 1;
mode = dynamic_pctl ? SSB_CLKMODE_DYNAMIC : SSB_CLKMODE_FAST;
ssb_chipco_set_clockmode(&bus->chipco, mode);
return 0;
error:
pr_err("Bus powerup failed\n");
return err;
}
EXPORT_SYMBOL(ssb_bus_powerup);
static void ssb_broadcast_value(struct ssb_device *dev,
u32 address, u32 data)
{
#ifdef CONFIG_SSB_DRIVER_PCICORE
/* This is used for both, PCI and ChipCommon core, so be careful. */
BUILD_BUG_ON(SSB_PCICORE_BCAST_ADDR != SSB_CHIPCO_BCAST_ADDR);
BUILD_BUG_ON(SSB_PCICORE_BCAST_DATA != SSB_CHIPCO_BCAST_DATA);
#endif
ssb_write32(dev, SSB_CHIPCO_BCAST_ADDR, address);
ssb_read32(dev, SSB_CHIPCO_BCAST_ADDR); /* flush */
ssb_write32(dev, SSB_CHIPCO_BCAST_DATA, data);
ssb_read32(dev, SSB_CHIPCO_BCAST_DATA); /* flush */
}
void ssb_commit_settings(struct ssb_bus *bus)
{
struct ssb_device *dev;
#ifdef CONFIG_SSB_DRIVER_PCICORE
dev = bus->chipco.dev ? bus->chipco.dev : bus->pcicore.dev;
#else
dev = bus->chipco.dev;
#endif
if (WARN_ON(!dev))
return;
/* This forces an update of the cached registers. */
ssb_broadcast_value(dev, 0xFD8, 0);
}
EXPORT_SYMBOL(ssb_commit_settings);
u32 ssb_admatch_base(u32 adm)
{
u32 base = 0;
switch (adm & SSB_ADM_TYPE) {
case SSB_ADM_TYPE0:
base = (adm & SSB_ADM_BASE0);
break;
case SSB_ADM_TYPE1:
WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
base = (adm & SSB_ADM_BASE1);
break;
case SSB_ADM_TYPE2:
WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
base = (adm & SSB_ADM_BASE2);
break;
default:
WARN_ON(1);
}
return base;
}
EXPORT_SYMBOL(ssb_admatch_base);
u32 ssb_admatch_size(u32 adm)
{
u32 size = 0;
switch (adm & SSB_ADM_TYPE) {
case SSB_ADM_TYPE0:
size = ((adm & SSB_ADM_SZ0) >> SSB_ADM_SZ0_SHIFT);
break;
case SSB_ADM_TYPE1:
WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
size = ((adm & SSB_ADM_SZ1) >> SSB_ADM_SZ1_SHIFT);
break;
case SSB_ADM_TYPE2:
WARN_ON(adm & SSB_ADM_NEG); /* unsupported */
size = ((adm & SSB_ADM_SZ2) >> SSB_ADM_SZ2_SHIFT);
break;
default:
WARN_ON(1);
}
size = (1 << (size + 1));
return size;
}
EXPORT_SYMBOL(ssb_admatch_size);
static int __init ssb_modinit(void)
{
int err;
/* See the comment at the ssb_is_early_boot definition */
ssb_is_early_boot = 0;
err = bus_register(&ssb_bustype);
if (err)
return err;
/* Maybe we already registered some buses at early boot.
* Check for this and attach them
*/
ssb_buses_lock();
err = ssb_attach_queued_buses();
ssb_buses_unlock();
if (err) {
bus_unregister(&ssb_bustype);
goto out;
}
err = b43_pci_ssb_bridge_init();
if (err) {
pr_err("Broadcom 43xx PCI-SSB-bridge initialization failed\n");
/* don't fail SSB init because of this */
}
err = ssb_host_pcmcia_init();
if (err) {
pr_err("PCMCIA host initialization failed\n");
/* don't fail SSB init because of this */
}
err = ssb_gige_init();
if (err) {
pr_err("SSB Broadcom Gigabit Ethernet driver initialization failed\n");
/* don't fail SSB init because of this */
err = 0;
}
out:
return err;
}
/* ssb must be initialized after PCI but before the ssb drivers.
* That means we must use some initcall between subsys_initcall
* and device_initcall.
*/
fs_initcall(ssb_modinit);
static void __exit ssb_modexit(void)
{
ssb_gige_exit();
ssb_host_pcmcia_exit();
b43_pci_ssb_bridge_exit();
bus_unregister(&ssb_bustype);
}
module_exit(ssb_modexit)