diff options
| -rw-r--r-- | drivers/thunderbolt/Makefile | 2 | ||||
| -rw-r--r-- | drivers/thunderbolt/nhi.c | 18 | ||||
| -rw-r--r-- | drivers/thunderbolt/tb.c | 134 | ||||
| -rw-r--r-- | drivers/thunderbolt/tb.h | 35 |
4 files changed, 186 insertions, 3 deletions
diff --git a/drivers/thunderbolt/Makefile b/drivers/thunderbolt/Makefile index 4b21c9926ea8..1f996bb96ac9 100644 --- a/drivers/thunderbolt/Makefile +++ b/drivers/thunderbolt/Makefile @@ -1,3 +1,3 @@ obj-${CONFIG_THUNDERBOLT} := thunderbolt.o -thunderbolt-objs := nhi.o ctl.o +thunderbolt-objs := nhi.o ctl.o tb.o diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c index 11070ff2cec7..d2b9ce857818 100644 --- a/drivers/thunderbolt/nhi.c +++ b/drivers/thunderbolt/nhi.c @@ -16,6 +16,7 @@ #include "nhi.h" #include "nhi_regs.h" +#include "tb.h" #define RING_TYPE(ring) ((ring)->is_tx ? "TX ring" : "RX ring") @@ -517,6 +518,7 @@ static void nhi_shutdown(struct tb_nhi *nhi) static int nhi_probe(struct pci_dev *pdev, const struct pci_device_id *id) { struct tb_nhi *nhi; + struct tb *tb; int res; res = pcim_enable_device(pdev); @@ -575,14 +577,26 @@ static int nhi_probe(struct pci_dev *pdev, const struct pci_device_id *id) /* magic value - clock related? */ iowrite32(3906250 / 10000, nhi->iobase + 0x38c00); - pci_set_drvdata(pdev, nhi); + dev_info(&nhi->pdev->dev, "NHI initialized, starting thunderbolt\n"); + tb = thunderbolt_alloc_and_start(nhi); + if (!tb) { + /* + * At this point the RX/TX rings might already have been + * activated. Do a proper shutdown. + */ + nhi_shutdown(nhi); + return -EIO; + } + pci_set_drvdata(pdev, tb); return 0; } static void nhi_remove(struct pci_dev *pdev) { - struct tb_nhi *nhi = pci_get_drvdata(pdev); + struct tb *tb = pci_get_drvdata(pdev); + struct tb_nhi *nhi = tb->nhi; + thunderbolt_shutdown_and_free(tb); nhi_shutdown(nhi); } diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c new file mode 100644 index 000000000000..6920979c5b14 --- /dev/null +++ b/drivers/thunderbolt/tb.c @@ -0,0 +1,134 @@ +/* + * Thunderbolt Cactus Ridge driver - bus logic (NHI independent) + * + * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> + */ + +#include <linux/slab.h> +#include <linux/errno.h> +#include <linux/delay.h> + +#include "tb.h" + +/* hotplug handling */ + +struct tb_hotplug_event { + struct work_struct work; + struct tb *tb; + u64 route; + u8 port; + bool unplug; +}; + +/** + * tb_handle_hotplug() - handle hotplug event + * + * Executes on tb->wq. + */ +static void tb_handle_hotplug(struct work_struct *work) +{ + struct tb_hotplug_event *ev = container_of(work, typeof(*ev), work); + struct tb *tb = ev->tb; + mutex_lock(&tb->lock); + if (!tb->hotplug_active) + goto out; /* during init, suspend or shutdown */ + + /* do nothing for now */ +out: + mutex_unlock(&tb->lock); + kfree(ev); +} + +/** + * tb_schedule_hotplug_handler() - callback function for the control channel + * + * Delegates to tb_handle_hotplug. + */ +static void tb_schedule_hotplug_handler(void *data, u64 route, u8 port, + bool unplug) +{ + struct tb *tb = data; + struct tb_hotplug_event *ev = kmalloc(sizeof(*ev), GFP_KERNEL); + if (!ev) + return; + INIT_WORK(&ev->work, tb_handle_hotplug); + ev->tb = tb; + ev->route = route; + ev->port = port; + ev->unplug = unplug; + queue_work(tb->wq, &ev->work); +} + +/** + * thunderbolt_shutdown_and_free() - shutdown everything + * + * Free all switches and the config channel. + * + * Used in the error path of thunderbolt_alloc_and_start. + */ +void thunderbolt_shutdown_and_free(struct tb *tb) +{ + mutex_lock(&tb->lock); + + if (tb->ctl) { + tb_ctl_stop(tb->ctl); + tb_ctl_free(tb->ctl); + } + tb->ctl = NULL; + tb->hotplug_active = false; /* signal tb_handle_hotplug to quit */ + + /* allow tb_handle_hotplug to acquire the lock */ + mutex_unlock(&tb->lock); + if (tb->wq) { + flush_workqueue(tb->wq); + destroy_workqueue(tb->wq); + tb->wq = NULL; + } + mutex_destroy(&tb->lock); + kfree(tb); +} + +/** + * thunderbolt_alloc_and_start() - setup the thunderbolt bus + * + * Allocates a tb_cfg control channel, initializes the root switch, enables + * plug events and activates pci devices. + * + * Return: Returns NULL on error. + */ +struct tb *thunderbolt_alloc_and_start(struct tb_nhi *nhi) +{ + struct tb *tb; + + tb = kzalloc(sizeof(*tb), GFP_KERNEL); + if (!tb) + return NULL; + + tb->nhi = nhi; + mutex_init(&tb->lock); + mutex_lock(&tb->lock); + + tb->wq = alloc_ordered_workqueue("thunderbolt", 0); + if (!tb->wq) + goto err_locked; + + tb->ctl = tb_ctl_alloc(tb->nhi, tb_schedule_hotplug_handler, tb); + if (!tb->ctl) + goto err_locked; + /* + * tb_schedule_hotplug_handler may be called as soon as the config + * channel is started. Thats why we have to hold the lock here. + */ + tb_ctl_start(tb->ctl); + + /* Allow tb_handle_hotplug to progress events */ + tb->hotplug_active = true; + mutex_unlock(&tb->lock); + return tb; + +err_locked: + mutex_unlock(&tb->lock); + thunderbolt_shutdown_and_free(tb); + return NULL; +} + diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h new file mode 100644 index 000000000000..6055dfd713fc --- /dev/null +++ b/drivers/thunderbolt/tb.h @@ -0,0 +1,35 @@ +/* + * Thunderbolt Cactus Ridge driver - bus logic (NHI independent) + * + * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> + */ + +#ifndef TB_H_ +#define TB_H_ + +#include "ctl.h" + +/** + * struct tb - main thunderbolt bus structure + */ +struct tb { + struct mutex lock; /* + * Big lock. Must be held when accessing cfg or + * any struct tb_switch / struct tb_port. + */ + struct tb_nhi *nhi; + struct tb_ctl *ctl; + struct workqueue_struct *wq; /* ordered workqueue for plug events */ + bool hotplug_active; /* + * tb_handle_hotplug will stop progressing plug + * events and exit if this is not set (it needs to + * acquire the lock one more time). Used to drain + * wq after cfg has been paused. + */ + +}; + +struct tb *thunderbolt_alloc_and_start(struct tb_nhi *nhi); +void thunderbolt_shutdown_and_free(struct tb *tb); + +#endif |