![Geoff Levand](/assets/img/avatar_default.png)
PS3 vuart updates to reflect the new PS3 unified device support. - Move vuart devices to the PS3 system bus. - Replace use of ps3_vuart_port_device with ps3_system_bus_device. - Make the PS3 vuart bus driver a loadable module. - Add remove() and shutdown() routines. - Move ps3_vuart_work into ps3_vuart_port_priv.tx_list. - Remove redundant spinlock ps3_vuart_work.lock. - No longer free ps3_vuart_port_device.priv on shutdown. - Cleanup Kconfig defs. - Export symbols needed for modular port drivers. - Arrange to use port numbers found in repository. - Fix bugs in ps3_vuart_read_async() and polled reading - Cleanup handling of shared interrupt with ps3_vuart_bus_interrupt_get() and ps3_vuart_bus_interrupt_put() - Add more comments to vuart.c. Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
1272 lines
31 KiB
C
1272 lines
31 KiB
C
/*
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* PS3 virtual uart
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*
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* Copyright (C) 2006 Sony Computer Entertainment Inc.
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* Copyright 2006 Sony Corp.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/workqueue.h>
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#include <asm/ps3.h>
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#include <asm/firmware.h>
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#include <asm/lv1call.h>
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#include <asm/bitops.h>
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#include "vuart.h"
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MODULE_AUTHOR("Sony Corporation");
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("PS3 vuart");
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/**
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* vuart - An inter-partition data link service.
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* port 0: PS3 AV Settings.
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* port 2: PS3 System Manager.
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*
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* The vuart provides a bi-directional byte stream data link between logical
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* partitions. Its primary role is as a communications link between the guest
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* OS and the system policy module. The current HV does not support any
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* connections other than those listed.
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*/
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enum {PORT_COUNT = 3,};
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enum vuart_param {
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PARAM_TX_TRIGGER = 0,
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PARAM_RX_TRIGGER = 1,
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PARAM_INTERRUPT_MASK = 2,
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PARAM_RX_BUF_SIZE = 3, /* read only */
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PARAM_RX_BYTES = 4, /* read only */
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PARAM_TX_BUF_SIZE = 5, /* read only */
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PARAM_TX_BYTES = 6, /* read only */
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PARAM_INTERRUPT_STATUS = 7, /* read only */
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};
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enum vuart_interrupt_bit {
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INTERRUPT_BIT_TX = 0,
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INTERRUPT_BIT_RX = 1,
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INTERRUPT_BIT_DISCONNECT = 2,
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};
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enum vuart_interrupt_mask {
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INTERRUPT_MASK_TX = 1,
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INTERRUPT_MASK_RX = 2,
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INTERRUPT_MASK_DISCONNECT = 4,
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};
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/**
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* struct ps3_vuart_port_priv - private vuart device data.
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*/
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struct ps3_vuart_port_priv {
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u64 interrupt_mask;
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struct {
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spinlock_t lock;
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struct list_head head;
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} tx_list;
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struct {
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struct ps3_vuart_work work;
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unsigned long bytes_held;
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spinlock_t lock;
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struct list_head head;
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} rx_list;
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struct ps3_vuart_stats stats;
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};
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static struct ps3_vuart_port_priv *to_port_priv(
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struct ps3_system_bus_device *dev)
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{
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BUG_ON(!dev);
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BUG_ON(!dev->driver_priv);
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return (struct ps3_vuart_port_priv *)dev->driver_priv;
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}
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/**
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* struct ports_bmp - bitmap indicating ports needing service.
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*
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* A 256 bit read only bitmap indicating ports needing service. Do not write
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* to these bits. Must not cross a page boundary.
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*/
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struct ports_bmp {
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u64 status;
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u64 unused[3];
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} __attribute__ ((aligned (32)));
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#define dump_ports_bmp(_b) _dump_ports_bmp(_b, __func__, __LINE__)
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static void __maybe_unused _dump_ports_bmp(
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const struct ports_bmp* bmp, const char* func, int line)
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{
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pr_debug("%s:%d: ports_bmp: %016lxh\n", func, line, bmp->status);
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}
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#define dump_port_params(_b) _dump_port_params(_b, __func__, __LINE__)
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static void __maybe_unused _dump_port_params(unsigned int port_number,
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const char* func, int line)
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{
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#if defined(DEBUG)
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static const char *strings[] = {
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"tx_trigger ",
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"rx_trigger ",
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"interrupt_mask ",
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"rx_buf_size ",
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"rx_bytes ",
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"tx_buf_size ",
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"tx_bytes ",
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"interrupt_status",
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};
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int result;
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unsigned int i;
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u64 value;
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for (i = 0; i < ARRAY_SIZE(strings); i++) {
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result = lv1_get_virtual_uart_param(port_number, i, &value);
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if (result) {
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pr_debug("%s:%d: port_%u: %s failed: %s\n", func, line,
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port_number, strings[i], ps3_result(result));
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continue;
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}
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pr_debug("%s:%d: port_%u: %s = %lxh\n",
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func, line, port_number, strings[i], value);
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}
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#endif
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}
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struct vuart_triggers {
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unsigned long rx;
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unsigned long tx;
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};
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int ps3_vuart_get_triggers(struct ps3_system_bus_device *dev,
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struct vuart_triggers *trig)
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{
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int result;
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unsigned long size;
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unsigned long val;
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result = lv1_get_virtual_uart_param(dev->port_number,
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PARAM_TX_TRIGGER, &trig->tx);
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if (result) {
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dev_dbg(&dev->core, "%s:%d: tx_trigger failed: %s\n",
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__func__, __LINE__, ps3_result(result));
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return result;
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}
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result = lv1_get_virtual_uart_param(dev->port_number,
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PARAM_RX_BUF_SIZE, &size);
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if (result) {
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dev_dbg(&dev->core, "%s:%d: tx_buf_size failed: %s\n",
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__func__, __LINE__, ps3_result(result));
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return result;
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}
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result = lv1_get_virtual_uart_param(dev->port_number,
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PARAM_RX_TRIGGER, &val);
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if (result) {
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dev_dbg(&dev->core, "%s:%d: rx_trigger failed: %s\n",
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__func__, __LINE__, ps3_result(result));
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return result;
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}
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trig->rx = size - val;
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dev_dbg(&dev->core, "%s:%d: tx %lxh, rx %lxh\n", __func__, __LINE__,
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trig->tx, trig->rx);
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return result;
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}
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int ps3_vuart_set_triggers(struct ps3_system_bus_device *dev, unsigned int tx,
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unsigned int rx)
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{
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int result;
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unsigned long size;
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result = lv1_set_virtual_uart_param(dev->port_number,
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PARAM_TX_TRIGGER, tx);
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if (result) {
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dev_dbg(&dev->core, "%s:%d: tx_trigger failed: %s\n",
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__func__, __LINE__, ps3_result(result));
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return result;
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}
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result = lv1_get_virtual_uart_param(dev->port_number,
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PARAM_RX_BUF_SIZE, &size);
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if (result) {
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dev_dbg(&dev->core, "%s:%d: tx_buf_size failed: %s\n",
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__func__, __LINE__, ps3_result(result));
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return result;
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}
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result = lv1_set_virtual_uart_param(dev->port_number,
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PARAM_RX_TRIGGER, size - rx);
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if (result) {
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dev_dbg(&dev->core, "%s:%d: rx_trigger failed: %s\n",
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__func__, __LINE__, ps3_result(result));
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return result;
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}
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dev_dbg(&dev->core, "%s:%d: tx %xh, rx %xh\n", __func__, __LINE__,
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tx, rx);
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return result;
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}
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static int ps3_vuart_get_rx_bytes_waiting(struct ps3_system_bus_device *dev,
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u64 *bytes_waiting)
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{
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int result;
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result = lv1_get_virtual_uart_param(dev->port_number,
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PARAM_RX_BYTES, bytes_waiting);
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if (result)
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dev_dbg(&dev->core, "%s:%d: rx_bytes failed: %s\n",
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__func__, __LINE__, ps3_result(result));
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dev_dbg(&dev->core, "%s:%d: %lxh\n", __func__, __LINE__,
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*bytes_waiting);
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return result;
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}
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/**
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* ps3_vuart_set_interrupt_mask - Enable/disable the port interrupt sources.
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* @dev: The struct ps3_system_bus_device instance.
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* @bmp: Logical OR of enum vuart_interrupt_mask values. A zero bit disables.
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*/
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static int ps3_vuart_set_interrupt_mask(struct ps3_system_bus_device *dev,
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unsigned long mask)
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{
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int result;
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struct ps3_vuart_port_priv *priv = to_port_priv(dev);
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dev_dbg(&dev->core, "%s:%d: %lxh\n", __func__, __LINE__, mask);
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priv->interrupt_mask = mask;
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result = lv1_set_virtual_uart_param(dev->port_number,
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PARAM_INTERRUPT_MASK, priv->interrupt_mask);
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if (result)
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dev_dbg(&dev->core, "%s:%d: interrupt_mask failed: %s\n",
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__func__, __LINE__, ps3_result(result));
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return result;
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}
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static int ps3_vuart_get_interrupt_status(struct ps3_system_bus_device *dev,
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unsigned long *status)
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{
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int result;
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struct ps3_vuart_port_priv *priv = to_port_priv(dev);
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u64 tmp;
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result = lv1_get_virtual_uart_param(dev->port_number,
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PARAM_INTERRUPT_STATUS, &tmp);
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if (result)
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dev_dbg(&dev->core, "%s:%d: interrupt_status failed: %s\n",
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__func__, __LINE__, ps3_result(result));
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*status = tmp & priv->interrupt_mask;
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dev_dbg(&dev->core, "%s:%d: m %lxh, s %lxh, m&s %lxh\n",
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__func__, __LINE__, priv->interrupt_mask, tmp, *status);
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return result;
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}
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int ps3_vuart_enable_interrupt_tx(struct ps3_system_bus_device *dev)
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{
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struct ps3_vuart_port_priv *priv = to_port_priv(dev);
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return (priv->interrupt_mask & INTERRUPT_MASK_TX) ? 0
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: ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
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| INTERRUPT_MASK_TX);
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}
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int ps3_vuart_enable_interrupt_rx(struct ps3_system_bus_device *dev)
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{
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struct ps3_vuart_port_priv *priv = to_port_priv(dev);
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return (priv->interrupt_mask & INTERRUPT_MASK_RX) ? 0
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: ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
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| INTERRUPT_MASK_RX);
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}
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int ps3_vuart_enable_interrupt_disconnect(struct ps3_system_bus_device *dev)
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{
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struct ps3_vuart_port_priv *priv = to_port_priv(dev);
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return (priv->interrupt_mask & INTERRUPT_MASK_DISCONNECT) ? 0
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: ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
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| INTERRUPT_MASK_DISCONNECT);
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}
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int ps3_vuart_disable_interrupt_tx(struct ps3_system_bus_device *dev)
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{
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struct ps3_vuart_port_priv *priv = to_port_priv(dev);
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return (priv->interrupt_mask & INTERRUPT_MASK_TX)
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? ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
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& ~INTERRUPT_MASK_TX) : 0;
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}
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int ps3_vuart_disable_interrupt_rx(struct ps3_system_bus_device *dev)
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{
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struct ps3_vuart_port_priv *priv = to_port_priv(dev);
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return (priv->interrupt_mask & INTERRUPT_MASK_RX)
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? ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
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& ~INTERRUPT_MASK_RX) : 0;
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}
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int ps3_vuart_disable_interrupt_disconnect(struct ps3_system_bus_device *dev)
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{
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struct ps3_vuart_port_priv *priv = to_port_priv(dev);
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return (priv->interrupt_mask & INTERRUPT_MASK_DISCONNECT)
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? ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
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& ~INTERRUPT_MASK_DISCONNECT) : 0;
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}
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/**
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* ps3_vuart_raw_write - Low level write helper.
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* @dev: The struct ps3_system_bus_device instance.
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*
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* Do not call ps3_vuart_raw_write directly, use ps3_vuart_write.
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*/
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static int ps3_vuart_raw_write(struct ps3_system_bus_device *dev,
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const void* buf, unsigned int bytes, unsigned long *bytes_written)
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{
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int result;
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struct ps3_vuart_port_priv *priv = to_port_priv(dev);
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result = lv1_write_virtual_uart(dev->port_number,
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ps3_mm_phys_to_lpar(__pa(buf)), bytes, bytes_written);
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if (result) {
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dev_dbg(&dev->core, "%s:%d: lv1_write_virtual_uart failed: "
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"%s\n", __func__, __LINE__, ps3_result(result));
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return result;
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}
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priv->stats.bytes_written += *bytes_written;
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dev_dbg(&dev->core, "%s:%d: wrote %lxh/%xh=>%lxh\n", __func__, __LINE__,
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*bytes_written, bytes, priv->stats.bytes_written);
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return result;
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}
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/**
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* ps3_vuart_raw_read - Low level read helper.
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* @dev: The struct ps3_system_bus_device instance.
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*
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* Do not call ps3_vuart_raw_read directly, use ps3_vuart_read.
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*/
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static int ps3_vuart_raw_read(struct ps3_system_bus_device *dev, void *buf,
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unsigned int bytes, unsigned long *bytes_read)
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{
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int result;
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struct ps3_vuart_port_priv *priv = to_port_priv(dev);
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dev_dbg(&dev->core, "%s:%d: %xh\n", __func__, __LINE__, bytes);
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result = lv1_read_virtual_uart(dev->port_number,
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ps3_mm_phys_to_lpar(__pa(buf)), bytes, bytes_read);
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if (result) {
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dev_dbg(&dev->core, "%s:%d: lv1_read_virtual_uart failed: %s\n",
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__func__, __LINE__, ps3_result(result));
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return result;
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}
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priv->stats.bytes_read += *bytes_read;
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dev_dbg(&dev->core, "%s:%d: read %lxh/%xh=>%lxh\n", __func__, __LINE__,
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*bytes_read, bytes, priv->stats.bytes_read);
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return result;
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}
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/**
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* ps3_vuart_clear_rx_bytes - Discard bytes received.
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* @dev: The struct ps3_system_bus_device instance.
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* @bytes: Max byte count to discard, zero = all pending.
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*
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* Used to clear pending rx interrupt source. Will not block.
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*/
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void ps3_vuart_clear_rx_bytes(struct ps3_system_bus_device *dev,
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unsigned int bytes)
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{
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int result;
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struct ps3_vuart_port_priv *priv = to_port_priv(dev);
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u64 bytes_waiting;
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void* tmp;
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result = ps3_vuart_get_rx_bytes_waiting(dev, &bytes_waiting);
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BUG_ON(result);
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bytes = bytes ? min(bytes, (unsigned int)bytes_waiting) : bytes_waiting;
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dev_dbg(&dev->core, "%s:%d: %u\n", __func__, __LINE__, bytes);
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if (!bytes)
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return;
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/* Add some extra space for recently arrived data. */
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bytes += 128;
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tmp = kmalloc(bytes, GFP_KERNEL);
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if (!tmp)
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return;
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ps3_vuart_raw_read(dev, tmp, bytes, &bytes_waiting);
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kfree(tmp);
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/* Don't include these bytes in the stats. */
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priv->stats.bytes_read -= bytes_waiting;
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}
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EXPORT_SYMBOL_GPL(ps3_vuart_clear_rx_bytes);
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/**
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* struct list_buffer - An element for a port device fifo buffer list.
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*/
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struct list_buffer {
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struct list_head link;
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const unsigned char *head;
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const unsigned char *tail;
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unsigned long dbg_number;
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unsigned char data[];
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};
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/**
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* ps3_vuart_write - the entry point for writing data to a port
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* @dev: The struct ps3_system_bus_device instance.
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*
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* If the port is idle on entry as much of the incoming data is written to
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* the port as the port will accept. Otherwise a list buffer is created
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* and any remaning incoming data is copied to that buffer. The buffer is
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* then enqueued for transmision via the transmit interrupt.
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*/
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int ps3_vuart_write(struct ps3_system_bus_device *dev, const void *buf,
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unsigned int bytes)
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{
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static unsigned long dbg_number;
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int result;
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struct ps3_vuart_port_priv *priv = to_port_priv(dev);
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unsigned long flags;
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struct list_buffer *lb;
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dev_dbg(&dev->core, "%s:%d: %u(%xh) bytes\n", __func__, __LINE__,
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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 semaphore 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;
|
|
}
|
|
|
|
down(&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__);
|
|
down(&vuart_bus_priv.probe_mutex);
|
|
goto fail_probe;
|
|
}
|
|
|
|
up(&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:
|
|
up(&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);
|
|
|
|
down(&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__);
|
|
up(&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__);
|
|
up(&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);
|
|
|
|
down(&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__);
|
|
up(&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__);
|
|
|
|
up(&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;
|
|
|
|
init_MUTEX(&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);
|