Release 4.11 drivers/ssb/main.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;
}
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#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;
}
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#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;
}

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static struct ssb_device *ssb_device_get(struct ssb_device *dev)
{
	if (dev)
		get_device(dev->dev);
	return dev;
}

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static void ssb_device_put(struct ssb_device *dev)
{
	if (dev)
		put_device(dev->dev);
}

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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;
}

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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;
}

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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;
}
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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;
}
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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;
	SSB_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 (SSB_WARN_ON(!sdrv->remove))
			continue;
		sdrv->remove(sdev);
		ctx->device_frozen[i] = 1;
	}

	return 0;
}

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/** 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 (SSB_WARN_ON(!sdev->dev || !sdev->dev->driver))
			continue;
		sdrv = drv_to_ssb_drv(sdev->dev->driver);
		if (SSB_WARN_ON(!sdrv || !sdrv->probe))
			continue;

		err = sdrv->probe(sdev, &sdev->id);
		if (err) {
			ssb_err("Failed to thaw device %s\n",
				dev_name(sdev->dev));
			result = err;
		}
		ssb_device_put(sdev);
	}

	return result;
}
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#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);
}

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static int 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);

	return 0;
}

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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;
}

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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;
}

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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;
}

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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);
}

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#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));
}
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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);
}

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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);
}

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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
}

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void ssb_bus_unregister(struct ssb_bus *bus)
{
	int err;

	err = ssb_gpio_unregister(bus);
	if (err == -EBUSY)
		ssb_dbg("Some GPIOs are still in use\n");
	else if (err)
		ssb_dbg("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);
}
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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);
}

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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) {
			ssb_err("Could not allocate device\n");
			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) {
			ssb_err("Could not register %s\n", dev_name(dev));
			/* Set dev to NULL to not unregister
                         * dev on error unwinding. */
			sdev->dev = NULL;
			kfree(devwrap);
			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;
}

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/* 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)
			ssb_dbg("GPIO driver not activated\n");
		else if (err)
			ssb_dbg("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;
}

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73.96%
1
33.33%
Rafał Miłecki
31
18.34%
1
33.33%
Hauke Mehrtens
13
7.69%
1
33.33%
Total
169
100.00%
3
100.00%



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;
}

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Michael Büsch
104
100.00%
2
100.00%
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104
100.00%
2
100.00%


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;
}

Contributors
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Michael Büsch
280
89.74%
3
50.00%
Albert Herranz
23
7.37%
1
16.67%
Hauke Mehrtens
8
2.56%
1
16.67%
Arnd Bergmann
1
0.32%
1
16.67%
Total
312
100.00%
6
100.00%

#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) {
		ssb_info("Sonics Silicon Backplane found on PCI device %s\n",
			 dev_name(&host_pci->dev));
	} else {
		ssb_err("Failed to register PCI version of SSB with error %d\n",
			err);
	}

	return err;
}
Contributors
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Michael Büsch
61
75.31%
1
33.33%
Joe Perches
14
17.28%
1
33.33%
Larry Finger
6
7.41%
1
33.33%
Total
81
100.00%
3
100.00%

#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) {
		ssb_info("Sonics Silicon Backplane found on PCMCIA device %s\n",
			 pcmcia_dev->devname);
	}

	return err;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Michael Büsch
65
91.55%
1
50.00%
Joe Perches
6
8.45%
1
50.00%
Total
71
100.00%
2
100.00%

#endif /* CONFIG_SSB_PCMCIAHOST */

#ifdef CONFIG_SSB_SDIOHOST


int ssb_bus_sdiobus_register(struct ssb_bus *bus,