diff options
Diffstat (limited to 'drivers/ps3/ps3-vuart.c')
| -rw-r--r-- | drivers/ps3/ps3-vuart.c | 1268 |
1 files changed, 1268 insertions, 0 deletions
diff --git a/drivers/ps3/ps3-vuart.c b/drivers/ps3/ps3-vuart.c new file mode 100644 index 00000000000..90c097a7a47 --- /dev/null +++ b/drivers/ps3/ps3-vuart.c @@ -0,0 +1,1268 @@ +/* + * PS3 virtual uart + * + * Copyright (C) 2006 Sony Computer Entertainment Inc. + * Copyright 2006 Sony Corp. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/interrupt.h> +#include <linux/workqueue.h> +#include <linux/bitops.h> +#include <asm/ps3.h> + +#include <asm/firmware.h> +#include <asm/lv1call.h> + +#include "vuart.h" + +MODULE_AUTHOR("Sony Corporation"); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("PS3 vuart"); + +/** + * vuart - An inter-partition data link service. + * port 0: PS3 AV Settings. + * port 2: PS3 System Manager. + * + * The vuart provides a bi-directional byte stream data link between logical + * partitions. Its primary role is as a communications link between the guest + * OS and the system policy module. The current HV does not support any + * connections other than those listed. + */ + +enum {PORT_COUNT = 3,}; + +enum vuart_param { + PARAM_TX_TRIGGER = 0, + PARAM_RX_TRIGGER = 1, + PARAM_INTERRUPT_MASK = 2, + PARAM_RX_BUF_SIZE = 3, /* read only */ + PARAM_RX_BYTES = 4, /* read only */ + PARAM_TX_BUF_SIZE = 5, /* read only */ + PARAM_TX_BYTES = 6, /* read only */ + PARAM_INTERRUPT_STATUS = 7, /* read only */ +}; + +enum vuart_interrupt_bit { + INTERRUPT_BIT_TX = 0, + INTERRUPT_BIT_RX = 1, + INTERRUPT_BIT_DISCONNECT = 2, +}; + +enum vuart_interrupt_mask { + INTERRUPT_MASK_TX = 1, + INTERRUPT_MASK_RX = 2, + INTERRUPT_MASK_DISCONNECT = 4, +}; + +/** + * struct ps3_vuart_port_priv - private vuart device data. + */ + +struct ps3_vuart_port_priv { + u64 interrupt_mask; + + struct { + spinlock_t lock; + struct list_head head; + } tx_list; + struct { + struct ps3_vuart_work work; + unsigned long bytes_held; + spinlock_t lock; + struct list_head head; + } rx_list; + struct ps3_vuart_stats stats; +}; + +static struct ps3_vuart_port_priv *to_port_priv( + struct ps3_system_bus_device *dev) +{ + BUG_ON(!dev); + BUG_ON(!dev->driver_priv); + return (struct ps3_vuart_port_priv *)dev->driver_priv; +} + +/** + * struct ports_bmp - bitmap indicating ports needing service. + * + * A 256 bit read only bitmap indicating ports needing service. Do not write + * to these bits. Must not cross a page boundary. + */ + +struct ports_bmp { + u64 status; + u64 unused[3]; +} __attribute__((aligned(32))); + +#define dump_ports_bmp(_b) _dump_ports_bmp(_b, __func__, __LINE__) +static void __maybe_unused _dump_ports_bmp( + const struct ports_bmp *bmp, const char *func, int line) +{ + pr_debug("%s:%d: ports_bmp: %016lxh\n", func, line, bmp->status); +} + +#define dump_port_params(_b) _dump_port_params(_b, __func__, __LINE__) +static void __maybe_unused _dump_port_params(unsigned int port_number, + const char *func, int line) +{ +#if defined(DEBUG) + static const char *strings[] = { + "tx_trigger ", + "rx_trigger ", + "interrupt_mask ", + "rx_buf_size ", + "rx_bytes ", + "tx_buf_size ", + "tx_bytes ", + "interrupt_status", + }; + int result; + unsigned int i; + u64 value; + + for (i = 0; i < ARRAY_SIZE(strings); i++) { + result = lv1_get_virtual_uart_param(port_number, i, &value); + + if (result) { + pr_debug("%s:%d: port_%u: %s failed: %s\n", func, line, + port_number, strings[i], ps3_result(result)); + continue; + } + pr_debug("%s:%d: port_%u: %s = %lxh\n", + func, line, port_number, strings[i], value); + } +#endif +} + +struct vuart_triggers { + unsigned long rx; + unsigned long tx; +}; + +int ps3_vuart_get_triggers(struct ps3_system_bus_device *dev, + struct vuart_triggers *trig) +{ + int result; + unsigned long size; + unsigned long val; + + result = lv1_get_virtual_uart_param(dev->port_number, + PARAM_TX_TRIGGER, &trig->tx); + + if (result) { + dev_dbg(&dev->core, "%s:%d: tx_trigger failed: %s\n", + __func__, __LINE__, ps3_result(result)); + return result; + } + + result = lv1_get_virtual_uart_param(dev->port_number, + PARAM_RX_BUF_SIZE, &size); + + if (result) { + dev_dbg(&dev->core, "%s:%d: tx_buf_size failed: %s\n", + __func__, __LINE__, ps3_result(result)); + return result; + } + + result = lv1_get_virtual_uart_param(dev->port_number, + PARAM_RX_TRIGGER, &val); + + if (result) { + dev_dbg(&dev->core, "%s:%d: rx_trigger failed: %s\n", + __func__, __LINE__, ps3_result(result)); + return result; + } + + trig->rx = size - val; + + dev_dbg(&dev->core, "%s:%d: tx %lxh, rx %lxh\n", __func__, __LINE__, + trig->tx, trig->rx); + + return result; +} + +int ps3_vuart_set_triggers(struct ps3_system_bus_device *dev, unsigned int tx, + unsigned int rx) +{ + int result; + unsigned long size; + + result = lv1_set_virtual_uart_param(dev->port_number, + PARAM_TX_TRIGGER, tx); + + if (result) { + dev_dbg(&dev->core, "%s:%d: tx_trigger failed: %s\n", + __func__, __LINE__, ps3_result(result)); + return result; + } + + result = lv1_get_virtual_uart_param(dev->port_number, + PARAM_RX_BUF_SIZE, &size); + + if (result) { + dev_dbg(&dev->core, "%s:%d: tx_buf_size failed: %s\n", + __func__, __LINE__, ps3_result(result)); + return result; + } + + result = lv1_set_virtual_uart_param(dev->port_number, + PARAM_RX_TRIGGER, size - rx); + + if (result) { + dev_dbg(&dev->core, "%s:%d: rx_trigger failed: %s\n", + __func__, __LINE__, ps3_result(result)); + return result; + } + + dev_dbg(&dev->core, "%s:%d: tx %xh, rx %xh\n", __func__, __LINE__, + tx, rx); + + return result; +} + +static int ps3_vuart_get_rx_bytes_waiting(struct ps3_system_bus_device *dev, + u64 *bytes_waiting) +{ + int result; + + result = lv1_get_virtual_uart_param(dev->port_number, + PARAM_RX_BYTES, bytes_waiting); + + if (result) + dev_dbg(&dev->core, "%s:%d: rx_bytes failed: %s\n", + __func__, __LINE__, ps3_result(result)); + + dev_dbg(&dev->core, "%s:%d: %lxh\n", __func__, __LINE__, + *bytes_waiting); + return result; +} + +/** + * ps3_vuart_set_interrupt_mask - Enable/disable the port interrupt sources. + * @dev: The struct ps3_system_bus_device instance. + * @bmp: Logical OR of enum vuart_interrupt_mask values. A zero bit disables. + */ + +static int ps3_vuart_set_interrupt_mask(struct ps3_system_bus_device *dev, + unsigned long mask) +{ + int result; + struct ps3_vuart_port_priv *priv = to_port_priv(dev); + + dev_dbg(&dev->core, "%s:%d: %lxh\n", __func__, __LINE__, mask); + + priv->interrupt_mask = mask; + + result = lv1_set_virtual_uart_param(dev->port_number, + PARAM_INTERRUPT_MASK, priv->interrupt_mask); + + if (result) + dev_dbg(&dev->core, "%s:%d: interrupt_mask failed: %s\n", + __func__, __LINE__, ps3_result(result)); + + return result; +} + +static int ps3_vuart_get_interrupt_status(struct ps3_system_bus_device *dev, + unsigned long *status) +{ + int result; + struct ps3_vuart_port_priv *priv = to_port_priv(dev); + u64 tmp; + + result = lv1_get_virtual_uart_param(dev->port_number, + PARAM_INTERRUPT_STATUS, &tmp); + + if (result) + dev_dbg(&dev->core, "%s:%d: interrupt_status failed: %s\n", + __func__, __LINE__, ps3_result(result)); + + *status = tmp & priv->interrupt_mask; + + dev_dbg(&dev->core, "%s:%d: m %lxh, s %lxh, m&s %lxh\n", + __func__, __LINE__, priv->interrupt_mask, tmp, *status); + + return result; +} + +int ps3_vuart_enable_interrupt_tx(struct ps3_system_bus_device *dev) +{ + struct ps3_vuart_port_priv *priv = to_port_priv(dev); + + return (priv->interrupt_mask & INTERRUPT_MASK_TX) ? 0 + : ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask + | INTERRUPT_MASK_TX); +} + +int ps3_vuart_enable_interrupt_rx(struct ps3_system_bus_device *dev) +{ + struct ps3_vuart_port_priv *priv = to_port_priv(dev); + + return (priv->interrupt_mask & INTERRUPT_MASK_RX) ? 0 + : ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask + | INTERRUPT_MASK_RX); +} + +int ps3_vuart_enable_interrupt_disconnect(struct ps3_system_bus_device *dev) +{ + struct ps3_vuart_port_priv *priv = to_port_priv(dev); + + return (priv->interrupt_mask & INTERRUPT_MASK_DISCONNECT) ? 0 + : ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask + | INTERRUPT_MASK_DISCONNECT); +} + +int ps3_vuart_disable_interrupt_tx(struct ps3_system_bus_device *dev) +{ + struct ps3_vuart_port_priv *priv = to_port_priv(dev); + + return (priv->interrupt_mask & INTERRUPT_MASK_TX) + ? ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask + & ~INTERRUPT_MASK_TX) : 0; +} + +int ps3_vuart_disable_interrupt_rx(struct ps3_system_bus_device *dev) +{ + struct ps3_vuart_port_priv *priv = to_port_priv(dev); + + return (priv->interrupt_mask & INTERRUPT_MASK_RX) + ? ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask + & ~INTERRUPT_MASK_RX) : 0; +} + +int ps3_vuart_disable_interrupt_disconnect(struct ps3_system_bus_device *dev) +{ + struct ps3_vuart_port_priv *priv = to_port_priv(dev); + + return (priv->interrupt_mask & INTERRUPT_MASK_DISCONNECT) + ? ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask + & ~INTERRUPT_MASK_DISCONNECT) : 0; +} + +/** + * ps3_vuart_raw_write - Low level write helper. + * @dev: The struct ps3_system_bus_device instance. + * + * Do not call ps3_vuart_raw_write directly, use ps3_vuart_write. + */ + +static int ps3_vuart_raw_write(struct ps3_system_bus_device *dev, + const void *buf, unsigned int bytes, unsigned long *bytes_written) +{ + int result; + struct ps3_vuart_port_priv *priv = to_port_priv(dev); + + result = lv1_write_virtual_uart(dev->port_number, + ps3_mm_phys_to_lpar(__pa(buf)), bytes, bytes_written); + + if (result) { + dev_dbg(&dev->core, "%s:%d: lv1_write_virtual_uart failed: " + "%s\n", __func__, __LINE__, ps3_result(result)); + return result; + } + + priv->stats.bytes_written += *bytes_written; + + dev_dbg(&dev->core, "%s:%d: wrote %lxh/%xh=>%lxh\n", __func__, __LINE__, + *bytes_written, bytes, priv->stats.bytes_written); + + return result; +} + +/** + * ps3_vuart_raw_read - Low level read helper. + * @dev: The struct ps3_system_bus_device instance. + * + * Do not call ps3_vuart_raw_read directly, use ps3_vuart_read. + */ + +static int ps3_vuart_raw_read(struct ps3_system_bus_device *dev, void *buf, + unsigned int bytes, unsigned long *bytes_read) +{ + int result; + struct ps3_vuart_port_priv *priv = to_port_priv(dev); + + dev_dbg(&dev->core, "%s:%d: %xh\n", __func__, __LINE__, bytes); + + result = lv1_read_virtual_uart(dev->port_number, + ps3_mm_phys_to_lpar(__pa(buf)), bytes, bytes_read); + + if (result) { + dev_dbg(&dev->core, "%s:%d: lv1_read_virtual_uart failed: %s\n", + __func__, __LINE__, ps3_result(result)); + return result; + } + + priv->stats.bytes_read += *bytes_read; + + dev_dbg(&dev->core, "%s:%d: read %lxh/%xh=>%lxh\n", __func__, __LINE__, + *bytes_read, bytes, priv->stats.bytes_read); + + return result; +} + +/** + * ps3_vuart_clear_rx_bytes - Discard bytes received. + * @dev: The struct ps3_system_bus_device instance. + * @bytes: Max byte count to discard, zero = all pending. + * + * Used to clear pending rx interrupt source. Will not block. + */ + +void ps3_vuart_clear_rx_bytes(struct ps3_system_bus_device *dev, + unsigned int bytes) +{ + int result; + struct ps3_vuart_port_priv *priv = to_port_priv(dev); + u64 bytes_waiting; + void *tmp; + + result = ps3_vuart_get_rx_bytes_waiting(dev, &bytes_waiting); + + BUG_ON(result); + + bytes = bytes ? min(bytes, (unsigned int)bytes_waiting) : bytes_waiting; + + dev_dbg(&dev->core, "%s:%d: %u\n", __func__, __LINE__, bytes); + + if (!bytes) + return; + + /* Add some extra space for recently arrived data. */ + + bytes += 128; + + tmp = kmalloc(bytes, GFP_KERNEL); + + if (!tmp) + return; + + ps3_vuart_raw_read(dev, tmp, bytes, &bytes_waiting); + + kfree(tmp); + + /* Don't include these bytes in the stats. */ + + priv->stats.bytes_read -= bytes_waiting; +} +EXPORT_SYMBOL_GPL(ps3_vuart_clear_rx_bytes); + +/** + * struct list_buffer - An element for a port device fifo buffer list. + */ + +struct list_buffer { + struct list_head link; + const unsigned char *head; + const unsigned char *tail; + unsigned long dbg_number; + unsigned char data[]; +}; + +/** + * ps3_vuart_write - the entry point for writing data to a port + * @dev: The struct ps3_system_bus_device instance. + * + * If the port is idle on entry as much of the incoming data is written to + * the port as the port will accept. Otherwise a list buffer is created + * and any remaning incoming data is copied to that buffer. The buffer is + * then enqueued for transmision via the transmit interrupt. + */ + +int ps3_vuart_write(struct ps3_system_bus_device *dev, const void *buf, + unsigned int bytes) +{ + static unsigned long dbg_number; + int result; + struct ps3_vuart_port_priv *priv = to_port_priv(dev); + unsigned long flags; + struct list_buffer *lb; + + dev_dbg(&dev->core, "%s:%d: %u(%xh) bytes\n", __func__, __LINE__, + bytes, bytes); + + spin_lock_irqsave(&priv->tx_list.lock, flags); + + if (list_empty(&priv->tx_list.head)) { + unsigned long bytes_written; + + result = ps3_vuart_raw_write(dev, buf, bytes, &bytes_written); + + spin_unlock_irqrestore(&priv->tx_list.lock, flags); + + if (result) { + dev_dbg(&dev->core, + "%s:%d: ps3_vuart_raw_write failed\n", + __func__, __LINE__); + return result; + } + + if (bytes_written == bytes) { + dev_dbg(&dev->core, "%s:%d: wrote %xh bytes\n", + __func__, __LINE__, bytes); + return 0; + } + + bytes -= bytes_written; + buf += bytes_written; + } else + spin_unlock_irqrestore(&priv->tx_list.lock, flags); + + lb = kmalloc(sizeof(struct list_buffer) + bytes, GFP_KERNEL); + + if (!lb) + return -ENOMEM; + + memcpy(lb->data, buf, bytes); + lb->head = lb->data; + lb->tail = lb->data + bytes; + lb->dbg_number = ++dbg_number; + + spin_lock_irqsave(&priv->tx_list.lock, flags); + list_add_tail(&lb->link, &priv->tx_list.head); + ps3_vuart_enable_interrupt_tx(dev); + spin_unlock_irqrestore(&priv->tx_list.lock, flags); + + dev_dbg(&dev->core, "%s:%d: queued buf_%lu, %xh bytes\n", + __func__, __LINE__, lb->dbg_number, bytes); + + return 0; +} +EXPORT_SYMBOL_GPL(ps3_vuart_write); + +/** + * ps3_vuart_queue_rx_bytes - Queue waiting bytes into the buffer list. + * @dev: The struct ps3_system_bus_device instance. + * @bytes_queued: Number of bytes queued to the buffer list. + * + * Must be called with priv->rx_list.lock held. + */ + +static int ps3_vuart_queue_rx_bytes(struct ps3_system_bus_device *dev, + u64 *bytes_queued) +{ + static unsigned long dbg_number; + int result; + struct ps3_vuart_port_priv *priv = to_port_priv(dev); + struct list_buffer *lb; + u64 bytes; + + *bytes_queued = 0; + + result = ps3_vuart_get_rx_bytes_waiting(dev, &bytes); + BUG_ON(result); + + if (result) + return -EIO; + + if (!bytes) + return 0; + + /* Add some extra space for recently arrived data. */ + + bytes += 128; + + lb = kmalloc(sizeof(struct list_buffer) + bytes, GFP_ATOMIC); + + if (!lb) + return -ENOMEM; + + ps3_vuart_raw_read(dev, lb->data, bytes, &bytes); + + lb->head = lb->data; + lb->tail = lb->data + bytes; + lb->dbg_number = ++dbg_number; + + list_add_tail(&lb->link, &priv->rx_list.head); + priv->rx_list.bytes_held += bytes; + + dev_dbg(&dev->core, "%s:%d: buf_%lu: queued %lxh bytes\n", + __func__, __LINE__, lb->dbg_number, bytes); + + *bytes_queued = bytes; + + return 0; +} + +/** + * ps3_vuart_read - The entry point for reading data from a port. + * + * Queue data waiting at the port, and if enough bytes to satisfy the request + * are held in the buffer list those bytes are dequeued and copied to the + * caller's buffer. Emptied list buffers are retiered. If the request cannot + * be statified by bytes held in the list buffers -EAGAIN is returned. + */ + +int ps3_vuart_read(struct ps3_system_bus_device *dev, void *buf, + unsigned int bytes) +{ + int result; + struct ps3_vuart_port_priv *priv = to_port_priv(dev); + unsigned long flags; + struct list_buffer *lb, *n; + unsigned long bytes_read; + + dev_dbg(&dev->core, "%s:%d: %u(%xh) bytes\n", __func__, __LINE__, + bytes, bytes); + + spin_lock_irqsave(&priv->rx_list.lock, flags); + + /* Queue rx bytes here for polled reads. */ + + while (priv->rx_list.bytes_held < bytes) { + u64 tmp; + + result = ps3_vuart_queue_rx_bytes(dev, &tmp); + if (result || !tmp) { + dev_dbg(&dev->core, "%s:%d: starved for %lxh bytes\n", + __func__, __LINE__, + bytes - priv->rx_list.bytes_held); + spin_unlock_irqrestore(&priv->rx_list.lock, flags); + return -EAGAIN; + } + } + + list_for_each_entry_safe(lb, n, &priv->rx_list.head, link) { + bytes_read = min((unsigned int)(lb->tail - lb->head), bytes); + + memcpy(buf, lb->head, bytes_read); + buf += bytes_read; + bytes -= bytes_read; + priv->rx_list.bytes_held -= bytes_read; + + if (bytes_read < lb->tail - lb->head) { + lb->head += bytes_read; + dev_dbg(&dev->core, "%s:%d: buf_%lu: dequeued %lxh " + "bytes\n", __func__, __LINE__, lb->dbg_number, + bytes_read); + spin_unlock_irqrestore(&priv->rx_list.lock, flags); + return 0; + } + + dev_dbg(&dev->core, "%s:%d: buf_%lu: free, dequeued %lxh " + "bytes\n", __func__, __LINE__, lb->dbg_number, + bytes_read); + + list_del(&lb->link); + kfree(lb); + } + + spin_unlock_irqrestore(&priv->rx_list.lock, flags); + return 0; +} +EXPORT_SYMBOL_GPL(ps3_vuart_read); + +/** + * ps3_vuart_work - Asynchronous read handler. + */ + +static void ps3_vuart_work(struct work_struct *work) +{ + struct ps3_system_bus_device *dev = + ps3_vuart_work_to_system_bus_dev(work); + struct ps3_vuart_port_driver *drv = + ps3_system_bus_dev_to_vuart_drv(dev); + + BUG_ON(!drv); + drv->work(dev); +} + +int ps3_vuart_read_async(struct ps3_system_bus_device *dev, unsigned int bytes) +{ + struct ps3_vuart_port_priv *priv = to_port_priv(dev); + unsigned long flags; + + if (priv->rx_list.work.trigger) { + dev_dbg(&dev->core, "%s:%d: warning, multiple calls\n", + __func__, __LINE__); + return -EAGAIN; + } + + BUG_ON(!bytes); + + PREPARE_WORK(&priv->rx_list.work.work, ps3_vuart_work); + + spin_lock_irqsave(&priv->rx_list.lock, flags); + if (priv->rx_list.bytes_held >= bytes) { + dev_dbg(&dev->core, "%s:%d: schedule_work %xh bytes\n", + __func__, __LINE__, bytes); + schedule_work(&priv->rx_list.work.work); + spin_unlock_irqrestore(&priv->rx_list.lock, flags); + return 0; + } + + priv->rx_list.work.trigger = bytes; + spin_unlock_irqrestore(&priv->rx_list.lock, flags); + + dev_dbg(&dev->core, "%s:%d: waiting for %u(%xh) bytes\n", __func__, + __LINE__, bytes, bytes); + + return 0; +} +EXPORT_SYMBOL_GPL(ps3_vuart_read_async); + +void ps3_vuart_cancel_async(struct ps3_system_bus_device *dev) +{ + to_port_priv(dev)->rx_list.work.trigger = 0; +} +EXPORT_SYMBOL_GPL(ps3_vuart_cancel_async); + +/** + * ps3_vuart_handle_interrupt_tx - third stage transmit interrupt handler + * + * Services the transmit interrupt for the port. Writes as much data from the + * buffer list as the port will accept. Retires any emptied list buffers and + * adjusts the final list buffer state for a partial write. + */ + +static int ps3_vuart_handle_interrupt_tx(struct ps3_system_bus_device *dev) +{ + int result = 0; + struct ps3_vuart_port_priv *priv = to_port_priv(dev); + unsigned long flags; + struct list_buffer *lb, *n; + unsigned long bytes_total = 0; + + dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__); + + spin_lock_irqsave(&priv->tx_list.lock, flags); + + list_for_each_entry_safe(lb, n, &priv->tx_list.head, link) { + + unsigned long bytes_written; + + result = ps3_vuart_raw_write(dev, lb->head, lb->tail - lb->head, + &bytes_written); + + if (result) { + dev_dbg(&dev->core, + "%s:%d: ps3_vuart_raw_write failed\n", + __func__, __LINE__); + break; + } + + bytes_total += bytes_written; + + if (bytes_written < lb->tail - lb->head) { + lb->head += bytes_written; + dev_dbg(&dev->core, + "%s:%d cleared buf_%lu, %lxh bytes\n", + __func__, __LINE__, lb->dbg_number, + bytes_written); + goto port_full; + } + + dev_dbg(&dev->core, "%s:%d free buf_%lu\n", __func__, __LINE__, + lb->dbg_number); + + list_del(&lb->link); + kfree(lb); + } + + ps3_vuart_disable_interrupt_tx(dev); +port_full: + spin_unlock_irqrestore(&priv->tx_list.lock, flags); + dev_dbg(&dev->core, "%s:%d wrote %lxh bytes total\n", + __func__, __LINE__, bytes_total); + return result; +} + +/** + * ps3_vuart_handle_interrupt_rx - third stage receive interrupt handler + * + * Services the receive interrupt for the port. Creates a list buffer and + * copies all waiting port data to that buffer and enqueues the buffer in the + * buffer list. Buffer list data is dequeued via ps3_vuart_read. + */ + +static int ps3_vuart_handle_interrupt_rx(struct ps3_system_bus_device *dev) +{ + int result; + struct ps3_vuart_port_priv *priv = to_port_priv(dev); + unsigned long flags; + u64 bytes; + + dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__); + + spin_lock_irqsave(&priv->rx_list.lock, flags); + result = ps3_vuart_queue_rx_bytes(dev, &bytes); + + if (result) { + spin_unlock_irqrestore(&priv->rx_list.lock, flags); + return result; + } + + if (priv->rx_list.work.trigger && priv->rx_list.bytes_held + >= priv->rx_list.work.trigger) { + dev_dbg(&dev->core, "%s:%d: schedule_work %lxh bytes\n", + __func__, __LINE__, priv->rx_list.work.trigger); + priv->rx_list.work.trigger = 0; + schedule_work(&priv->rx_list.work.work); + } + + spin_unlock_irqrestore(&priv->rx_list.lock, flags); + return result; +} + +static int ps3_vuart_handle_interrupt_disconnect( + struct ps3_system_bus_device *dev) +{ + dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__); + BUG_ON("no support"); + return -1; +} + +/** + * ps3_vuart_handle_port_interrupt - second stage interrupt handler + * + * Services any pending interrupt types for the port. Passes control to the + * third stage type specific interrupt handler. Returns control to the first + * stage handler after one iteration. + */ + +static int ps3_vuart_handle_port_interrupt(struct ps3_system_bus_device *dev) +{ + int result; + struct ps3_vuart_port_priv *priv = to_port_priv(dev); + unsigned long status; + + result = ps3_vuart_get_interrupt_status(dev, &status); + + if (result) + return result; + + dev_dbg(&dev->core, "%s:%d: status: %lxh\n", __func__, __LINE__, + status); + + if (status & INTERRUPT_MASK_DISCONNECT) { + priv->stats.disconnect_interrupts++; + result = ps3_vuart_handle_interrupt_disconnect(dev); + if (result) + ps3_vuart_disable_interrupt_disconnect(dev); + } + + if (status & INTERRUPT_MASK_TX) { + priv->stats.tx_interrupts++; + result = ps3_vuart_handle_interrupt_tx(dev); + if (result) + ps3_vuart_disable_interrupt_tx(dev); + } + + if (status & INTERRUPT_MASK_RX) { + priv->stats.rx_interrupts++; + result = ps3_vuart_handle_interrupt_rx(dev); + if (result) + ps3_vuart_disable_interrupt_rx(dev); + } + + return 0; +} + +struct vuart_bus_priv { + struct ports_bmp *bmp; + unsigned int virq; + struct mutex probe_mutex; + int use_count; + struct ps3_system_bus_device *devices[PORT_COUNT]; +} static vuart_bus_priv; + +/** + * ps3_vuart_irq_handler - first stage interrupt handler + * + * Loops finding any interrupting port and its associated instance data. + * Passes control to the second stage port specific interrupt handler. Loops + * until all outstanding interrupts are serviced. + */ + +static irqreturn_t ps3_vuart_irq_handler(int irq, void *_private) +{ + struct vuart_bus_priv *bus_priv = _private; + + BUG_ON(!bus_priv); + + while (1) { + unsigned int port; + + dump_ports_bmp(bus_priv->bmp); + + port = (BITS_PER_LONG - 1) - __ilog2(bus_priv->bmp->status); + + if (port == BITS_PER_LONG) + break; + + BUG_ON(port >= PORT_COUNT); + BUG_ON(!bus_priv->devices[port]); + + ps3_vuart_handle_port_interrupt(bus_priv->devices[port]); + } + + return IRQ_HANDLED; +} + +static int ps3_vuart_bus_interrupt_get(void) +{ + int result; + + pr_debug(" -> %s:%d\n", __func__, __LINE__); + + vuart_bus_priv.use_count++; + + BUG_ON(vuart_bus_priv.use_count > 2); + + if (vuart_bus_priv.use_count != 1) + return 0; + + BUG_ON(vuart_bus_priv.bmp); + + vuart_bus_priv.bmp = kzalloc(sizeof(struct ports_bmp), GFP_KERNEL); + + if (!vuart_bus_priv.bmp) { + pr_debug("%s:%d: kzalloc failed.\n", __func__, __LINE__); + result = -ENOMEM; + goto fail_bmp_malloc; + } + + result = ps3_vuart_irq_setup(PS3_BINDING_CPU_ANY, vuart_bus_priv.bmp, + &vuart_bus_priv.virq); + + if (result) { + pr_debug("%s:%d: ps3_vuart_irq_setup failed (%d)\n", + __func__, __LINE__, result); + result = -EPERM; + goto fail_alloc_irq; + } + + result = request_irq(vuart_bus_priv.virq, ps3_vuart_irq_handler, + IRQF_DISABLED, "vuart", &vuart_bus_priv); + + if (result) { + pr_debug("%s:%d: request_irq failed (%d)\n", + __func__, __LINE__, result); + goto fail_request_irq; + } + + pr_debug(" <- %s:%d: ok\n", __func__, __LINE__); + return result; + +fail_request_irq: + ps3_vuart_irq_destroy(vuart_bus_priv.virq); + vuart_bus_priv.virq = NO_IRQ; +fail_alloc_irq: + kfree(vuart_bus_priv.bmp); + vuart_bus_priv.bmp = NULL; +fail_bmp_malloc: + vuart_bus_priv.use_count--; + pr_debug(" <- %s:%d: failed\n", __func__, __LINE__); + return result; +} + +static int ps3_vuart_bus_interrupt_put(void) +{ + pr_debug(" -> %s:%d\n", __func__, __LINE__); + + vuart_bus_priv.use_count--; + + BUG_ON(vuart_bus_priv.use_count < 0); + + if (vuart_bus_priv.use_count != 0) + return 0; + + free_irq(vuart_bus_priv.virq, &vuart_bus_priv); + + ps3_vuart_irq_destroy(vuart_bus_priv.virq); + vuart_bus_priv.virq = NO_IRQ; + + kfree(vuart_bus_priv.bmp); + vuart_bus_priv.bmp = NULL; + + pr_debug(" <- %s:%d\n", __func__, __LINE__); + return 0; +} + +static int ps3_vuart_probe(struct ps3_system_bus_device *dev) +{ + int result; + struct ps3_vuart_port_driver *drv; + struct ps3_vuart_port_priv *priv = NULL; + + dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__); + + drv = ps3_system_bus_dev_to_vuart_drv(dev); + + dev_dbg(&dev->core, "%s:%d: (%s)\n", __func__, __LINE__, + drv->core.core.name); + + BUG_ON(!drv); + + if (dev->port_number >= PORT_COUNT) { + BUG(); + return -EINVAL; + } + + mutex_lock(&vuart_bus_priv.probe_mutex); + + result = ps3_vuart_bus_interrupt_get(); + + if (result) + goto fail_setup_interrupt; + + if (vuart_bus_priv.devices[dev->port_number]) { + dev_dbg(&dev->core, "%s:%d: port busy (%d)\n", __func__, + __LINE__, dev->port_number); + result = -EBUSY; + goto fail_busy; + } + + vuart_bus_priv.devices[dev->port_number] = dev; + + /* Setup dev->driver_priv. */ + + dev->driver_priv = kzalloc(sizeof(struct ps3_vuart_port_priv), + GFP_KERNEL); + + if (!dev->driver_priv) { + result = -ENOMEM; + goto fail_dev_malloc; + } + + priv = to_port_priv(dev); + + INIT_LIST_HEAD(&priv->tx_list.head); + spin_lock_init(&priv->tx_list.lock); + + INIT_LIST_HEAD(&priv->rx_list.head); + spin_lock_init(&priv->rx_list.lock); + + INIT_WORK(&priv->rx_list.work.work, NULL); + priv->rx_list.work.trigger = 0; + priv->rx_list.work.dev = dev; + + /* clear stale pending interrupts */ + + ps3_vuart_clear_rx_bytes(dev, 0); + + ps3_vuart_set_interrupt_mask(dev, INTERRUPT_MASK_RX); + + ps3_vuart_set_triggers(dev, 1, 1); + + if (drv->probe) + result = drv->probe(dev); + else { + result = 0; + dev_info(&dev->core, "%s:%d: no probe method\n", __func__, + __LINE__); + } + + if (result) { + dev_dbg(&dev->core, "%s:%d: drv->probe failed\n", + __func__, __LINE__); + goto fail_probe; + } + + mutex_unlock(&vuart_bus_priv.probe_mutex); + + return result; + +fail_probe: + ps3_vuart_set_interrupt_mask(dev, 0); + kfree(dev->driver_priv); + dev->driver_priv = NULL; +fail_dev_malloc: + vuart_bus_priv.devices[dev->port_number] = NULL; +fail_busy: + ps3_vuart_bus_interrupt_put(); +fail_setup_interrupt: + mutex_unlock(&vuart_bus_priv.probe_mutex); + dev_dbg(&dev->core, "%s:%d: failed\n", __func__, __LINE__); + return result; +} + +/** + * ps3_vuart_cleanup - common cleanup helper. + * @dev: The struct ps3_system_bus_device instance. + * + * Cleans interrupts and HV resources. Must be called with + * vuart_bus_priv.probe_mutex held. Used by ps3_vuart_remove and + * ps3_vuart_shutdown. After this call, polled reading will still work. + */ + +static int ps3_vuart_cleanup(struct ps3_system_bus_device *dev) +{ + dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__); + + ps3_vuart_cancel_async(dev); + ps3_vuart_set_interrupt_mask(dev, 0); + ps3_vuart_bus_interrupt_put(); + return 0; +} + +/** + * ps3_vuart_remove - Completely clean the device instance. + * @dev: The struct ps3_system_bus_device instance. + * + * Cleans all memory, interrupts and HV resources. After this call the + * device can no longer be used. + */ + +static int ps3_vuart_remove(struct ps3_system_bus_device *dev) +{ + struct ps3_vuart_port_priv *priv = to_port_priv(dev); + struct ps3_vuart_port_driver *drv; + + BUG_ON(!dev); + + mutex_lock(&vuart_bus_priv.probe_mutex); + + dev_dbg(&dev->core, " -> %s:%d: match_id %d\n", __func__, __LINE__, + dev->match_id); + + if (!dev->core.driver) { + dev_dbg(&dev->core, "%s:%d: no driver bound\n", __func__, + __LINE__); + mutex_unlock(&vuart_bus_priv.probe_mutex); + return 0; + } + + drv = ps3_system_bus_dev_to_vuart_drv(dev); + + BUG_ON(!drv); + + if (drv->remove) { + drv->remove(dev); + } else { + dev_dbg(&dev->core, "%s:%d: no remove method\n", __func__, + __LINE__); + BUG(); + } + + ps3_vuart_cleanup(dev); + + vuart_bus_priv.devices[dev->port_number] = NULL; + kfree(priv); + priv = NULL; + + dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__); + mutex_unlock(&vuart_bus_priv.probe_mutex); + return 0; +} + +/** + * ps3_vuart_shutdown - Cleans interrupts and HV resources. + * @dev: The struct ps3_system_bus_device instance. + * + * Cleans interrupts and HV resources. After this call the + * device can still be used in polling mode. This behavior required + * by sys-manager to be able to complete the device power operation + * sequence. + */ + +static int ps3_vuart_shutdown(struct ps3_system_bus_device *dev) +{ + struct ps3_vuart_port_driver *drv; + + BUG_ON(!dev); + + mutex_lock(&vuart_bus_priv.probe_mutex); + + dev_dbg(&dev->core, " -> %s:%d: match_id %d\n", __func__, __LINE__, + dev->match_id); + + if (!dev->core.driver) { + dev_dbg(&dev->core, "%s:%d: no driver bound\n", __func__, + __LINE__); + mutex_unlock(&vuart_bus_priv.probe_mutex); + return 0; + } + + drv = ps3_system_bus_dev_to_vuart_drv(dev); + + BUG_ON(!drv); + + if (drv->shutdown) + drv->shutdown(dev); + else if (drv->remove) { + dev_dbg(&dev->core, "%s:%d: no shutdown, calling remove\n", + __func__, __LINE__); + drv->remove(dev); + } else { + dev_dbg(&dev->core, "%s:%d: no shutdown method\n", __func__, + __LINE__); + BUG(); + } + + ps3_vuart_cleanup(dev); + + dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__); + + mutex_unlock(&vuart_bus_priv.probe_mutex); + return 0; +} + +static int __init ps3_vuart_bus_init(void) +{ + pr_debug("%s:%d:\n", __func__, __LINE__); + + if (!firmware_has_feature(FW_FEATURE_PS3_LV1)) + return -ENODEV; + + mutex_init(&vuart_bus_priv.probe_mutex); + + return 0; +} + +static void __exit ps3_vuart_bus_exit(void) +{ + pr_debug("%s:%d:\n", __func__, __LINE__); +} + +core_initcall(ps3_vuart_bus_init); +module_exit(ps3_vuart_bus_exit); + +/** + * ps3_vuart_port_driver_register - Add a vuart port device driver. + */ + +int ps3_vuart_port_driver_register(struct ps3_vuart_port_driver *drv) +{ + int result; + + pr_debug("%s:%d: (%s)\n", __func__, __LINE__, drv->core.core.name); + + BUG_ON(!drv->core.match_id); + BUG_ON(!drv->core.core.name); + + drv->core.probe = ps3_vuart_probe; + drv->core.remove = ps3_vuart_remove; + drv->core.shutdown = ps3_vuart_shutdown; + + result = ps3_system_bus_driver_register(&drv->core); + return result; +} +EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_register); + +/** + * ps3_vuart_port_driver_unregister - Remove a vuart port device driver. + */ + +void ps3_vuart_port_driver_unregister(struct ps3_vuart_port_driver *drv) +{ + pr_debug("%s:%d: (%s)\n", __func__, __LINE__, drv->core.core.name); + ps3_system_bus_driver_unregister(&drv->core); +} +EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_unregister); |