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Date: Thu, 9 Oct 2008 09:36:02 +0300
From: "Matti Linnanvuori" <mattilinn@...il.com>
To: "David Miller" <davem@...emloft.net>,
"Jeff Garzik" <jgarzik@...ox.com>
Cc: netdev@...r.kernel.org
Subject: Re: WAN: add driver retina
From: Matti Linnanvuori <matti.linnanvuori@...om.com>
Retina G.703 and G.SHDSL driver.
Signed-off-by: Matti Linnanvuori <matti.linnanvuori@...om.com>
---
This patch is on top of linux-2.6.27-rc6-next-20080919:
http://groups.google.com/group/pcidriver/web/retina.patch
--- linux-2.6.27-rc6/MAINTAINERS 2008-10-09 09:06:54.547536585 +0300
+++ linux-2.6.27-rc6-next-20080919/MAINTAINERS 2008-10-09
09:09:28.135670455 +0300
@@ -3527,6 +3527,13 @@ REISERFS FILE SYSTEM
L: reiserfs-devel@...r.kernel.org
S: Supported
+RETINA WAN DRIVER
+P: Matti Linnanvuori
+M: matti.linnanvuori@...om.com
+L: netdev@...r.kernel.org
+L: linux-kernel@...r.kernel.org
+S: Supported
+
RFKILL
P: Ivo van Doorn
M: IvDoorn@...il.com
--- linux-2.6.27-rc6/drivers/net/wan/Kconfig 2008-10-09 09:19:00.577596411 +0300
+++ linux-2.6.27-rc6-next-20080919/drivers/net/wan/Kconfig 2008-10-09
09:13:02.829401392 +0300
@@ -492,4 +492,14 @@ config SBNI_MULTILINE
If unsure, say N.
+config RETINA
+ tristate "Retina support"
+ depends on PCI
+ help
+ Driver for Retina C5400 and E2200 network PCI cards, which
+ support G.703, G.SHDSL with Ethernet encapsulation or
+ character device for mapping raw bitstream buffers to memory.
+ To compile this driver as a module, choose M here: the
+ module will be called retina.
+
endif # WAN
--- linux-2.6.27-rc6/drivers/net/wan/Makefile 2008-10-09
09:06:55.195638433 +0300
+++ linux-2.6.27-rc6-next-20080919/drivers/net/wan/Makefile 2008-10-09
09:13:47.800466208 +0300
@@ -41,6 +41,7 @@ obj-$(CONFIG_C101) += c101.o
obj-$(CONFIG_WANXL) += wanxl.o
obj-$(CONFIG_PCI200SYN) += pci200syn.o
obj-$(CONFIG_PC300TOO) += pc300too.o
+obj-$(CONFIG_RETINA) += retina.o
clean-files := wanxlfw.inc
$(obj)/wanxl.o: $(obj)/wanxlfw.inc
--- linux-2.6.27-rc6/drivers/net/wan/retina.h 1970-01-01
02:00:00.000000000 +0200
+++ linux-2.6.27-rc6-next-20080919/drivers/net/wan/retina.h 2008-10-09
09:14:13.856559440 +0300
@@ -0,0 +1,163 @@
+/* V1.0.0 */
+
+/*
+ Copyright (C) 2002-2003 Jouni Kujala, Flexibilis Oy.
+
+ 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; either version 2
+ of the License, or (at your option) any later version.
+
+ 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.
+
+ All the drivers derived from or based on this code fall under the
+ GPL and must retain the copyright and license notice.
+*/
+
+#ifndef RETINA_H
+#define RETINA_H
+
+#include <linux/ioctl.h>
+#include <linux/types.h>
+
+/* char device related stuff: */
+
+#define FEPCI_SHARED_MEM_OFFSETT 0x8000
+#define FEPCI_IDENTIFICATION_OFFSETT (FEPCI_SHARED_MEM_OFFSETT+0x0)
+#define FEPCI_FEATURES_OFFSETT (FEPCI_SHARED_MEM_OFFSETT+0x40)
+#define FEPCI_SETTINGS_OFFSETT (FEPCI_SHARED_MEM_OFFSETT+0x80)
+#define FEPCI_STATUS_OFFSETT (FEPCI_SHARED_MEM_OFFSETT+0xE0)
+#define FEPCI_MAILBOX_OFFSETT (FEPCI_SHARED_MEM_OFFSETT+0x100)
+
+/* structures for ioctl calls: */
+struct fepci_ioctl_identification {
+ unsigned char data[0x20];
+};
+struct fepci_real_identification {
+ unsigned long int data[0x10];
+};
+
+struct fepci_ioctl_features {
+ unsigned char data[0x20];
+};
+struct fepci_real_features {
+ unsigned long int data[0x10];
+};
+
+struct fepci_ioctl_settings {
+ unsigned char data[0x30];
+};
+struct fepci_real_settings {
+ unsigned long int data[0x15];
+};
+
+struct fepci_ioctl_status {
+ unsigned char data[0x10];
+};
+struct fepci_real_status {
+ unsigned long int data[0x5];
+};
+
+struct fepci_ioctl_shared_mem {
+ unsigned long int data[0x80];
+};
+
+#define FEPCI_IOCTL_MAGIC 0xAA
+
+#define FEPCI_IOCTL_R_SHARED_MEM _IOR(FEPCI_IOCTL_MAGIC, 1, \
+struct fepci_ioctl_shared_mem)
+#define FEPCI_IOCTL_W_SHARED_MEM _IOW(FEPCI_IOCTL_MAGIC, 2, \
+struct fepci_ioctl_shared_mem)
+
+#define FEPCI_IOCTL_STREAM_BUFSIZE _IO(FEPCI_IOCTL_MAGIC, 3)
+#define FEPCI_IOCTL_STREAM_UNITSIZE _IO(FEPCI_IOCTL_MAGIC, 4)
+#define FEPCI_IOCTL_STREAM_OPEN _IO(FEPCI_IOCTL_MAGIC, 5)
+#define FEPCI_IOCTL_STREAM_START _IO(FEPCI_IOCTL_MAGIC, 6)
+#define FEPCI_IOCTL_STREAM_CLOSE _IO(FEPCI_IOCTL_MAGIC, 7)
+
+#define FEPCI_IOCTL_G_IDENTIFICATION _IOR(FEPCI_IOCTL_MAGIC, 0x81, \
+struct fepci_ioctl_identification)
+#define FEPCI_IOCTL_G_FEATURES _IOR(FEPCI_IOCTL_MAGIC, 0x82, \
+struct fepci_ioctl_features)
+#define FEPCI_IOCTL_G_SETTINGS _IOR(FEPCI_IOCTL_MAGIC, 0x83, \
+struct fepci_ioctl_settings)
+#define FEPCI_IOCTL_G_STATUS _IOR(FEPCI_IOCTL_MAGIC, 0x84, \
+struct fepci_ioctl_status)
+
+/* mailbox: */
+
+struct fepci_ioctl_mailbox {
+ unsigned char Semafore;
+ unsigned char Mail_number;
+ unsigned char Size;
+ unsigned char Command;
+ unsigned char Data[112];
+};
+
+struct fepci_real_mailbox {
+ __u32 Semafore_Mail_number;
+ __u32 Size_Command;
+ __u32 Data[112 / 2];
+};
+
+#define FEPCI_IOCTL_B_POLL _IO(FEPCI_IOCTL_MAGIC, 0x85)
+#define FEPCI_IOCTL_B_GRAB _IO(FEPCI_IOCTL_MAGIC, 0x86)
+#define FEPCI_IOCTL_B_RELEASE _IO(FEPCI_IOCTL_MAGIC, 0x87)
+#define FEPCI_IOCTL_B_S_CMAIL _IOW(FEPCI_IOCTL_MAGIC, 0x88, \
+struct fepci_ioctl_mailbox)
+#define FEPCI_IOCTL_B_S_QMAIL _IOW(FEPCI_IOCTL_MAGIC, 0x89, \
+struct fepci_ioctl_mailbox)
+#define FEPCI_IOCTL_B_G_MAIL _IOR(FEPCI_IOCTL_MAGIC, 0x90, \
+struct fepci_ioctl_mailbox)
+
+#define FEPCI_IOCTL_ALARM_MANAGER _IO(FEPCI_IOCTL_MAGIC, 0x91)
+#define FEPCI_IOCTL_STREAM_TRANSMIT_POLL _IO(FEPCI_IOCTL_MAGIC, 0x92)
+#define FEPCI_IOCTL_STREAM_RECEIVE_POLL _IO(FEPCI_IOCTL_MAGIC, 0x93)
+#define FEPCI_IOCTL_STREAM_BOTH_POLL _IO(FEPCI_IOCTL_MAGIC, 0x94)
+
+/* stream related stuff: */
+
+/* stream buffer address space:
+ * address: 0x 7 6 5 4 3 2 1 0
+ * ^ ^ ^
+ * | | |
+ * card | area(rx/tx,0==rx,1==tx)
+ * channel */
+
+#define CARD_ADDRESS_SHIFT 24u
+#define CHANNEL_ADDRESS_SHIFT 20u
+#define AREA_ADDRESS_SHIFT 16u
+
+#define STREAM_BUFFER_POINTER_AREA 0x7fff0000 /* one page reserved */
+
+/* stream buffer pointers (at pointer area):
+ * address: 0x 7 6 5 4 3 2 1 0
+ * ^ ^ ^
+ * | | |
+ * card | area(rx/tx,0==rx,4==tx)
+ * channel */
+
+#define CARD_POINTER_SHIFT 8u
+#define CHANNEL_POINTER_SHIFT 4u
+#define AREA_POINTER_SHIFT 2u
+
+/* fake pointers are for faking larger unit sizes to the user than
+ * what is the maximum internal unit size in FEPCI */
+#define USER_RX_S_FAKE_POINTER(__card, __channel, __offset) \
+((u32 *)(((__card << CARD_POINTER_SHIFT) | \
+(__channel << CHANNEL_POINTER_SHIFT) | 0x0) + __offset))
+#define USER_TX_S_FAKE_POINTER(__card, __channel, __offset) \
+((u32 *)(((__card << CARD_POINTER_SHIFT) | \
+(__channel << CHANNEL_POINTER_SHIFT) | 0x4) + __offset))
+
+#define USER_RX_S_POINTER(__card, __channel, __offset) \
+((u32 *)(((__card << CARD_POINTER_SHIFT) | \
+(__channel << CHANNEL_POINTER_SHIFT) | 0x8) + __offset))
+#define USER_TX_S_POINTER(__card, __channel, __offset) \
+((u32 *)(((__card << CARD_POINTER_SHIFT) | \
+(__channel << CHANNEL_POINTER_SHIFT) | 0xC) + __offset))
+
+#endif
--- linux-2.6.27-rc6/drivers/net/wan/retina.c 1970-01-01
02:00:00.000000000 +0200
+++ linux-2.6.27-rc6-next-20080919/drivers/net/wan/retina.c 2008-10-09
09:14:13.856559440 +0300
@@ -0,0 +1,2053 @@
+/* retina.c: */
+
+/*
+ This driver is based on:
+
+ /drivers/net/fepci.c
+ FEPCI (Frame Engine for PCI) driver for Linux operating system
+
+ Copyright (C) 2002-2003 Jouni Kujala, Flexibilis Oy.
+
+ 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; either version 2
+ of the License, or (at your option) any later version.
+
+ 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.
+
+ All the drivers derived from or based on this code fall under the
+ GPL and must retain the copyright and license notice.
+*/
+
+#define MAX_TX_UNITS 256u
+#define MAX_RX_UNITS 256u
+
+#define MAX_UNIT_SZ_ORDER 10u
+
+#define TX_RING_SIZE 8u
+#define RX_RING_SIZE 8u
+
+#define CHANNELS 4u
+
+#define RX_FIFO_THRESHOLD_PACKET_MODE 0x4
+#define TX_FIFO_THRESHOLD_PACKET_MODE 0x4
+#define TX_DESC_THRESHOLD_PACKET_MODE 0x4
+
+#define RX_FIFO_THRESHOLD_STREAM_MODE 0x4
+#define TX_FIFO_THRESHOLD_STREAM_MODE 0x7
+#define TX_DESC_THRESHOLD_STREAM_MODE 0x1
+
+#define RETINA_MRU 2000u
+#define RETINA_DMA_SIZE (RETINA_MRU + 4u)
+
+static char fepci_name[] = "retina";
+static const char fepci_alarm_manager_name[] = "retina alarm manager";
+static const char fepci_netdev_name[] = "dcpxx";
+
+static unsigned int find_cnt;
+
+/* Time in jiffies before concluding that the transmitter is hung. */
+#define TX_TIMEOUT (5 * HZ)
+
+#include "retina.h"
+#include <linux/mm.h>
+#include <linux/random.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/ethtool.h>
+#include <linux/delay.h>
+#include <linux/version.h>
+#include <linux/pfn.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+#include <linux/fs.h>
+#include <linux/rtnetlink.h>
+
+#include <asm/pgtable.h>
+
+MODULE_VERSION("1.2.36");
+
+/* PCI I/O space extent */
+enum { FEPCI_SIZE = 0x20000 };
+
+static struct pci_device_id fepci_pci_tbl[] __devinitdata = {
+ {0x1FC0, 0x0300, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+ {0x1FC0, 0x0301, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+ {0,}
+};
+
+MODULE_DESCRIPTION("Frame Engine for PCI (FEPCI)");
+MODULE_AUTHOR("Jouni Kujala");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, fepci_pci_tbl);
+
+struct retina_address {
+ struct sk_buff *skbuff;
+ DECLARE_PCI_UNMAP_ADDR(address)
+};
+
+struct fepci_ch_private {
+ struct net_device *this_dev;
+ struct tasklet_struct transmission;
+ struct fepci_desc __iomem *tx_desc; /* Transmission ring start. */
+ struct retina_address tx[TX_RING_SIZE];
+
+ unsigned int reg_txctrl;
+ unsigned char channel_number;
+ unsigned char cur_tx; /* the next filled tx_descriptor */
+ /* in stream mode the desc which is being transmitted */
+ /* rx_descriptor where next packet transferred */
+ unsigned char cur_rx;
+ /* in stream mode the desc which is being received */
+ bool in_eth_mode;
+
+ unsigned int reg_rxctrl;
+ struct fepci_desc __iomem *rx_desc; /* Reception ring start. */
+ struct retina_address rx[RX_RING_SIZE];
+
+ struct timer_list timer;
+ struct fepci_card_private *this_card_priv;
+
+/* stream mode: */
+ unsigned char bufsize_order; /* 10=1kB,11=2kB,12=4kB...16=64kB */
+ unsigned char unit_sz_order; /* 8=256B...14=16kB */
+ unsigned char fake_unit_sz_order;
+ bool in_stream_mode;
+ bool stream_on;
+ unsigned char cur_tx_unit; /* last sent tx_unit */
+ /* rx_unit where to next packet is transferred */
+ unsigned char cur_rx_unit;
+ /* char device: */
+ u32 *rx_buffer;
+ u32 *tx_buffer;
+ unsigned bufsize;
+ unsigned unit_sz;
+ unsigned units; /* 2,4,8,16,...,256 */
+ /* fake units (and pointers) are for faking larger unit sizes to
+ * the user than what is the maximum internal unit size in FEPCI */
+ unsigned fake_unit_sz;
+ unsigned fake_units;
+ u32 *tx_unit[MAX_TX_UNITS];
+ u32 *rx_unit[MAX_RX_UNITS];
+};
+
+struct fepci_card_private {
+ unsigned char card_number;
+ bool removed;
+ uint8_t __iomem *ioaddr;
+ struct mutex mutex;
+ struct pci_dev *pci_dev;
+ struct fepci_ch_private *ch_privates[CHANNELS];
+
+ wait_queue_head_t alarm_manager_wait_q;
+
+ wait_queue_head_t stream_receive_q;
+ wait_queue_head_t stream_transmit_q;
+ wait_queue_head_t stream_both_q;
+};
+
+enum retina_semaphore {
+ RETINA_IDLE = 0,
+ RETINA_IN_USE = 7,
+ RETINA_RESERVED_UCTRL = 0x80,
+ RETINA_RESERVED_PC = 0x40,
+ RETINA_READY_PC_REPLY = 0x21,
+ RETINA_READY_PC = 0x20,
+ RETINA_READY_UCTRL_REPLY = 0x11,
+ RETINA_READY_UCTRL = 0x10
+};
+
+/* Offsets to the FEPCI registers */
+enum fepci_offsets {
+ reg_custom = 0x40,
+
+ reg_first_int_mask = 0x80,
+ reg_first_int_status = 0xc0,
+
+ reg_first_rxctrl = 0x4000,
+ to_next_rxctrl = 0x80,
+
+ reg_first_txctrl = 0x6000,
+ to_next_txctrl = 0x80,
+
+ first_rx_desc = 0x10000,
+ to_next_ch_rx_desc = 0x200,
+
+ first_tx_desc = 0x18000,
+ to_next_ch_tx_desc = 0x200,
+};
+
+enum reg_custom_bits {
+ AM_interrupt_mask = 0x1,
+ AM_interrupt_status = 0x100,
+};
+
+enum reg_receive_control {
+ Rx_fifo_threshold = 0x7,
+ Receive_enable = 0x80000000,
+};
+
+enum reg_transmit_control {
+ Tx_fifo_threshold = 0x7,
+ Tx_desc_threshold = 0x700,
+ Transmit_enable = 0x80000000,
+};
+
+enum int_bits {
+ MaskFrameReceived = 0x01,
+ MaskRxFifoError = 0x02,
+ MaskRxFrameDroppedError = 0x04,
+ MaskFrameTransmitted = 0x40,
+ MaskTxFifoError = 0x80,
+ MaskAllInts = 0xc7,
+ IntrFrameReceived = 0x01,
+ IntrRxFifoError = 0x02,
+ IntrRxFrameDroppedError = 0x04,
+ IntrFrameTransmitted = 0x40,
+ IntrTxFifoError = 0x80,
+ IntrAllInts = 0xc7,
+};
+
+/**
+ * The reception and transmission buffer descriptors.
+ * Elements are written as 32 bit for endian portability.
+ **/
+
+struct fepci_desc {
+ u32 desc_a;
+ u32 desc_b;
+};
+
+enum desc_b_bits {
+ frame_length = 0xFFF,
+ fifo_error = 0x10000,
+ size_error = 0x20000,
+ crc_error = 0x40000,
+ octet_error = 0x80000,
+ line_error = 0x100000,
+ enable_transfer = 0x80000000,
+ transfer_not_done = 0x80000000,
+};
+
+/* Global variables (common to whole driver, all the cards): */
+static int major; /* character device major number */
+static struct fepci_card_private **card_privates;
+static unsigned long stream_pointers;
+
+static void set_int_mask(unsigned char channel, unsigned value,
+ struct fepci_card_private *cp)
+{
+ uint8_t __iomem *address = cp->ioaddr + reg_first_int_mask;
+ const unsigned shift = 8u * channel;
+ uint32_t oldvalue = readl(address);
+ oldvalue &= ~(0xff << shift); /* Clear bits. */
+ oldvalue |= value << shift; /* Set bits. */
+ writel(oldvalue, address);
+}
+
+static inline void clear_int(unsigned char channel, uint32_t value,
+ uint8_t __iomem *ioaddr)
+{
+ writel(~(value << (8 * channel)), ioaddr + reg_first_int_status);
+}
+
+static inline unsigned get_int_status(unsigned char channel,
+ uint8_t __iomem *ioaddr)
+{
+ const uint32_t oldvalue = readl(ioaddr + reg_first_int_status);
+ return (oldvalue >> (8 * channel)) & 0xff; /* Clear other bits. */
+}
+
+static void fillregisterswith_00(uint8_t __iomem *ioaddr)
+{
+ writel(0x0, ioaddr + reg_first_rxctrl);
+ writel(0x0, ioaddr + reg_first_txctrl);
+ writel(0x0, ioaddr + reg_first_int_mask);
+ writel(0x0, ioaddr + reg_first_int_status);
+ writel(0x0, ioaddr + first_rx_desc);
+ writel(0x0, ioaddr + first_tx_desc);
+}
+
+static int fepci_open(struct net_device *dev);
+static void fepci_timer(unsigned long data);
+static void fepci_tx_timeout(struct net_device *dev);
+static int fepci_start_xmit(struct sk_buff *skb, struct net_device *dev);
+static irqreturn_t fepci_interrupt(int irq, void *dev_instance);
+static int fepci_close(struct net_device *dev);
+static void fepci_close_down(struct net_device *dev,
+ struct fepci_ch_private *fp,
+ struct fepci_card_private *card);
+static void fepci_remove_one(struct pci_dev *pdev);
+static void retina_tx(unsigned long channel);
+
+
+static int fepci_char_open(struct inode *inode, struct file *filp);
+
+/**
+ * fepci_char_mmap() - map buffers for raw bitstreams
+ * @filp: pointer to struct file.
+ * @vma: pointer to struct vm_area_struct.
+ *
+ * Offset STREAM_BUFFER_POINTER_AREA is used to map stream buffer pointers at
+ * the pointer area defined in retina.h.
+ * Otherwise, offset specifies a stream buffer area with the interface number
+ * shifted left by CHANNEL_ADDRESS_SHIFT and reception (0) or transmission (1)
+ * area shifted left by AREA_POINTER_SHIFT.
+ **/
+
+static int fepci_char_mmap(struct file *filp, struct vm_area_struct *vma);
+static int fepci_char_ioctl(struct inode *inode, struct file *filp,
+ unsigned int cmd, unsigned long arg);
+
+static struct file_operations fepci_char_fops = {
+ .owner = THIS_MODULE,
+ .ioctl = fepci_char_ioctl,
+ .open = fepci_char_open,
+ .mmap = fepci_char_mmap
+};
+
+/**
+ * fepci_stream_open() - sets an interface to raw bitstream mode
+ * @cp: pointer to struct fepci_card_private.
+ * @fp: pointer to struct struct fepci_ch_private.
+ *
+ * Sets an interface to raw bitstream mode. Called by ioctl
+ * FEPCI_IOCTL_STREAM_OPEN. The buffer size should have been specified with
+ * ioctl FEPCI_IOCTL_STREAM_BUFSIZE and transfer unit size with
+ * ioctl FEPCI_IOCTL_STREAM_UNITSIZE.
+ **/
+static int fepci_stream_open(struct fepci_card_private *cp,
+ struct fepci_ch_private *fp);
+
+/**
+ * fepci_stream_start() - starts raw bitstream transfer of an interface
+ * @cp: pointer to struct fepci_card_private.
+ * @fp: pointer to struct struct fepci_ch_private.
+ *
+ * Starts the raw bitstream transfer of an interface. Called by ioctl
+ * FEPCI_IOCTL_STREAM_START. The interface must have been set to raw
+ * bitstream mode with ioctl FEPCI_IOCTL_STREAM_OPEN.
+ **/
+static int fepci_stream_start(struct fepci_card_private *cp,
+ struct fepci_ch_private *fp);
+
+/**
+ * fepci_stream_close() - sets an interface off of raw bitstream mode
+ * @cp: pointer to struct fepci_card_private.
+ * @fp: pointer to struct struct fepci_ch_private.
+ *
+ * Sets an interface off of raw bitstream mode. Called by ioctl
+ * FEPCI_IOCTL_STREAM_CLOSE. The interface should have been
+ * set to raw bitstream mode with ioctl FEPCI_IOCTL_STREAM_OPEN.
+ **/
+static int fepci_stream_close(struct fepci_card_private *cp,
+ struct fepci_ch_private *fp);
+static int fepci_stream_close_down(struct fepci_card_private *cp,
+ struct fepci_ch_private *fp);
+
+static inline struct fepci_card_private *retina_card(unsigned number)
+{
+ struct fepci_card_private *card;
+ rcu_read_lock();
+ card = rcu_dereference(card_privates[number]);
+ rcu_read_unlock();
+ return card;
+}
+
+static int fepci_char_open(struct inode *inode, struct file *filp)
+{
+ unsigned int minor = MINOR(inode->i_rdev);
+ struct fepci_card_private *card;
+ if (unlikely(minor >= find_cnt))
+ return -ENXIO;
+ card = retina_card(minor);
+ if (unlikely(card->removed))
+ return -ENXIO;
+ filp->private_data = card;
+ return 0;
+}
+
+static int fepci_char_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+ unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
+ unsigned long size = vma->vm_end - vma->vm_start;
+ unsigned long virtual_address;
+ unsigned long pfn;
+ struct fepci_card_private *device = filp->private_data;
+
+ if (offset == STREAM_BUFFER_POINTER_AREA) {
+ virtual_address = stream_pointers;
+ if (size > (1ul << PAGE_SHIFT)) {
+ dev_warn(&device->pci_dev->dev,
+ "mmap: area size over range\n");
+ return -EINVAL;
+ }
+ } else {
+ unsigned long channel = (offset >> CHANNEL_ADDRESS_SHIFT) & 0xf;
+ /* 0 = reception, 1 = transmission */
+ unsigned long area = (offset >> AREA_ADDRESS_SHIFT) & 0xf;
+ if (unlikely(device->removed))
+ goto INVALID;
+ if (area == 0ul) {
+ virtual_address = (unsigned long)
+ device->ch_privates[channel]->rx_buffer;
+ } else if (area == 1ul) {
+ virtual_address = (unsigned long)
+ device->ch_privates[channel]->tx_buffer;
+ } else {
+INVALID:
+ return -EINVAL;
+ }
+ if (unlikely(virtual_address == 0ul))
+ goto INVALID;
+ }
+ vma->vm_file = filp;
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ pfn = PFN_DOWN(virt_to_phys((void *)virtual_address));
+ return remap_pfn_range(vma, vma->vm_start, pfn, size,
+ vma->vm_page_prot);
+}
+
+/* mmap operations end */
+
+/* char operations start */
+
+static int fepci_copy_to_user(unsigned long to, uint8_t __iomem *from,
+ unsigned len, bool shrink)
+{
+ if (shrink) {
+ unsigned int w;
+ for (w = 0u; w < len; w += 2) {
+ uint32_t longword = readl_relaxed(from + w / 2u *
+ sizeof(u32));
+ int error = __put_user(longword,
+ (unsigned char __user *)
+ (to + w));
+ if (unlikely(error))
+ return error;
+ error = __put_user(longword >> 8,
+ (unsigned char __user *)
+ (to + w + 1));
+ if (unlikely(error))
+ return error;
+ }
+ } else {
+ unsigned int w;
+ for (w = 0u; w < len; w += 4u) {
+ uint32_t longword = readl_relaxed(from + w);
+ int error = __put_user(longword,
+ (uint32_t __user *)(to + w));
+ if (unlikely(error))
+ return error;
+ }
+ }
+ return 0;
+}
+
+static int fepci_copy_from_user(uint8_t __iomem *to, unsigned long from,
+ unsigned len, bool enlarge)
+{
+ if (enlarge) {
+ unsigned int w;
+ for (w = 0u; w < len; w += 2u) {
+ unsigned char temp1;
+ unsigned char temp2;
+ int error = __get_user(temp1,
+ (unsigned char __user *)
+ (from + w));
+ if (unlikely(error))
+ return error;
+ error = __get_user(temp2,
+ (unsigned char __user *)
+ (from + w + 1u));
+ if (unlikely(error))
+ return error;
+ writel(temp1 + (temp2 << 8), to + w * 2u);
+ }
+ } else {
+ unsigned int w;
+ for (w = 0u; w < len; w += 4u) {
+ uint32_t longword;
+ int error = __get_user(longword,
+ (u32 __user *)(from + w));
+ if (unlikely(error))
+ return error;
+ writel(longword, to + w);
+ }
+ }
+ return 0;
+}
+
+static
+enum retina_semaphore get_semafore(struct fepci_real_mailbox __iomem *mailbox)
+{
+ return readb_relaxed(&mailbox->Semafore_Mail_number);
+}
+
+static void set_semafore(struct fepci_real_mailbox __iomem *mailbox,
+ enum retina_semaphore value)
+{
+ uint32_t number = readl_relaxed(&mailbox->Semafore_Mail_number);
+ number = ((number & ~0xFF) | value) + (1u << 8);
+ writel(number, &mailbox->Semafore_Mail_number);
+}
+
+static int fepci_char_ioctl(struct inode *inode, struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ unsigned int minor = MINOR(inode->i_rdev);
+ uint8_t __iomem *ioaddr;
+ struct fepci_real_mailbox __iomem *real_mailbox;
+ int retval = 0;
+ struct fepci_card_private *card = filp->private_data;
+
+ if (unlikely(card->removed))
+ return -ENXIO;
+
+ if (_IOC_DIR(cmd) & _IOC_READ)
+ if (unlikely(!access_ok(VERIFY_WRITE, (void __user *)arg,
+ _IOC_SIZE(cmd))))
+ return -EFAULT;
+ if (_IOC_DIR(cmd) & _IOC_WRITE)
+ if (unlikely(!access_ok(VERIFY_READ, (void __user *)arg,
+ _IOC_SIZE(cmd))))
+ return -EFAULT;
+
+ ioaddr = card->ioaddr;
+ real_mailbox = (struct fepci_real_mailbox __iomem *)
+ (ioaddr + FEPCI_MAILBOX_OFFSETT);
+
+ switch (cmd) {
+ case FEPCI_IOCTL_STREAM_TRANSMIT_POLL:
+ /* Here: arg == channel number. */
+ if (unlikely(arg >= CHANNELS ||
+ !(card->ch_privates[arg]->stream_on))) {
+ return 0x2;
+ } else {
+ unsigned long pointer =
+ *USER_TX_S_FAKE_POINTER(minor, arg,
+ stream_pointers);
+ wait_event_interruptible(card->stream_transmit_q,
+ (pointer !=
+ *USER_TX_S_FAKE_POINTER
+ (minor, arg,
+ stream_pointers)));
+ return 0x1;
+ }
+ return retval;
+ case FEPCI_IOCTL_STREAM_RECEIVE_POLL:
+ /* Here: arg == channel number. */
+ if (unlikely(arg >= CHANNELS ||
+ !(card->ch_privates[arg]->stream_on))) {
+ return 0x2;
+ } else {
+ unsigned long pointer =
+ *USER_RX_S_FAKE_POINTER(minor, arg,
+ stream_pointers);
+ wait_event_interruptible(card->stream_receive_q,
+ (pointer !=
+ *USER_RX_S_FAKE_POINTER
+ (minor, arg,
+ stream_pointers)));
+ retval = 0x1;
+ }
+ return retval;
+ case FEPCI_IOCTL_STREAM_BOTH_POLL:
+ /* Here: arg == channel number. */
+ if (unlikely(arg >= CHANNELS ||
+ !(card->ch_privates[arg]->stream_on))) {
+ return 0x2;
+ } else {
+ unsigned long temp_tx_pointer =
+ *USER_TX_S_FAKE_POINTER(minor, arg,
+ stream_pointers);
+ unsigned long temp_rx_pointer =
+ *USER_RX_S_FAKE_POINTER(minor, arg,
+ stream_pointers);
+ wait_event_interruptible(card->stream_both_q,
+ (temp_tx_pointer !=
+ *USER_TX_S_FAKE_POINTER
+ (minor, arg, stream_pointers))
+ || (temp_rx_pointer !=
+ *USER_RX_S_FAKE_POINTER
+ (minor, arg,
+ stream_pointers)));
+ retval = 0x1;
+ }
+ return retval;
+ case FEPCI_IOCTL_R_SHARED_MEM:
+ retval = fepci_copy_to_user(arg,
+ ioaddr + FEPCI_SHARED_MEM_OFFSETT,
+ _IOC_SIZE(cmd), false);
+ break;
+ case FEPCI_IOCTL_W_SHARED_MEM:
+ retval = fepci_copy_from_user(ioaddr + FEPCI_SHARED_MEM_OFFSETT,
+ arg, _IOC_SIZE(cmd), false);
+ break;
+ case FEPCI_IOCTL_G_IDENTIFICATION:
+ retval = fepci_copy_to_user(arg,
+ ioaddr +
+ FEPCI_IDENTIFICATION_OFFSETT,
+ _IOC_SIZE(cmd), true);
+ break;
+ case FEPCI_IOCTL_G_FEATURES:
+ retval = fepci_copy_to_user(arg, ioaddr +
+ FEPCI_FEATURES_OFFSETT,
+ _IOC_SIZE(cmd), true);
+ break;
+ case FEPCI_IOCTL_G_SETTINGS:
+ retval = fepci_copy_to_user(arg, ioaddr +
+ FEPCI_SETTINGS_OFFSETT,
+ _IOC_SIZE(cmd), true);
+ break;
+ case FEPCI_IOCTL_G_STATUS:
+ retval = fepci_copy_to_user(arg, ioaddr + FEPCI_STATUS_OFFSETT,
+ _IOC_SIZE(cmd), true);
+ break;
+ case FEPCI_IOCTL_B_POLL:
+ mutex_lock(&card->mutex);
+ retval = get_semafore(real_mailbox);
+ mutex_unlock(&card->mutex);
+ break;
+ case FEPCI_IOCTL_B_GRAB:
+ mutex_lock(&card->mutex);
+ if (get_semafore(real_mailbox) == RETINA_IDLE) {
+ set_semafore(real_mailbox, RETINA_RESERVED_PC);
+ get_semafore(real_mailbox); /* Wait for write. */
+ msleep(1u); /* Delay at least 1 millisecond. */
+ switch (get_semafore(real_mailbox)) {
+ case RETINA_RESERVED_PC:
+ retval = 0;
+ break;
+ case RETINA_READY_UCTRL:
+ case RETINA_READY_UCTRL_REPLY:
+ case RETINA_RESERVED_UCTRL:
+ retval = 0x1;
+ break;
+ default:
+ retval = 0xff;
+ }
+ } else {
+ switch (get_semafore(real_mailbox)) {
+ case RETINA_READY_UCTRL:
+ case RETINA_READY_UCTRL_REPLY:
+ case RETINA_RESERVED_UCTRL:
+ retval = 0x1;
+ break;
+ default:
+ retval = 0xff;
+ }
+ }
+ mutex_unlock(&card->mutex);
+ break;
+ case FEPCI_IOCTL_B_RELEASE:
+ mutex_lock(&card->mutex);
+ switch (get_semafore(real_mailbox)) {
+ case RETINA_RESERVED_PC:
+ case RETINA_READY_PC:
+ retval = 0x0;
+ set_semafore(real_mailbox, RETINA_IDLE);
+ break;
+ case RETINA_READY_PC_REPLY:
+ retval = 0x04;
+ break;
+ case RETINA_READY_UCTRL:
+ case RETINA_READY_UCTRL_REPLY:
+ case RETINA_RESERVED_UCTRL:
+ retval = 0x1;
+ break;
+ default:
+ retval = 0xff;
+ }
+ mutex_unlock(&card->mutex);
+ break;
+ case FEPCI_IOCTL_B_S_CMAIL:
+ mutex_lock(&card->mutex);
+ switch (get_semafore(real_mailbox)) {
+ case RETINA_RESERVED_PC:
+ case RETINA_READY_PC_REPLY:
+ case RETINA_READY_PC:
+ if (unlikely(_IOC_SIZE(cmd) <= 2u))
+ goto DEFAULT;
+ /* Copy the mailbox. */
+ retval = fepci_copy_from_user(ioaddr +
+ FEPCI_MAILBOX_OFFSETT + 4u,
+ arg + 2ul, _IOC_SIZE(cmd) - 2u,
+ true);
+ /* Semaphore -> 10. */
+ set_semafore(real_mailbox, RETINA_READY_UCTRL);
+ break;
+ case RETINA_READY_UCTRL:
+ case RETINA_READY_UCTRL_REPLY:
+ case RETINA_RESERVED_UCTRL:
+ retval = 0x1;
+ break;
+ case RETINA_IDLE:
+ retval = 0x3;
+ break;
+ default:
+ retval = 0xff;
+ }
+ mutex_unlock(&card->mutex);
+ break;
+ case FEPCI_IOCTL_B_S_QMAIL:
+ mutex_lock(&card->mutex);
+ switch (get_semafore(real_mailbox)) {
+ case RETINA_RESERVED_PC:
+ case RETINA_READY_PC_REPLY:
+ case RETINA_READY_PC:
+ if (unlikely(_IOC_SIZE(cmd) <= 2u))
+ goto DEFAULT;
+ /* Copy the mailbox; */
+ retval = fepci_copy_from_user(ioaddr +
+ FEPCI_MAILBOX_OFFSETT + 4u,
+ arg + 2ul, _IOC_SIZE(cmd) - 2u,
+ true);
+ /* Semaphore -> 11 */
+ set_semafore(real_mailbox, RETINA_READY_UCTRL_REPLY);
+ break;
+ case RETINA_READY_UCTRL:
+ case RETINA_READY_UCTRL_REPLY:
+ case RETINA_RESERVED_UCTRL:
+ retval = 0x1;
+ break;
+ case RETINA_IDLE:
+ retval = 0x3;
+ break;
+ default:
+DEFAULT: retval = 0xff;
+ }
+ mutex_unlock(&card->mutex);
+ break;
+ case FEPCI_IOCTL_B_G_MAIL:
+ mutex_lock(&card->mutex);
+ switch (get_semafore(real_mailbox)) {
+ case RETINA_READY_UCTRL:
+ case RETINA_READY_UCTRL_REPLY:
+ case RETINA_RESERVED_UCTRL:
+ retval = 0x1;
+ break;
+ case RETINA_RESERVED_PC:
+ case RETINA_READY_PC_REPLY:
+ case RETINA_READY_PC:
+ retval = fepci_copy_to_user(arg,
+ ioaddr +
+ FEPCI_MAILBOX_OFFSETT,
+ _IOC_SIZE(cmd), true);
+ break;
+ case RETINA_IDLE:
+ retval = 0x3;
+ break;
+ default:
+ retval = 0xff;
+ }
+ if (unlikely(retval != 0)) {
+ /* copy four lowest bytes from the mailbox */
+ retval = fepci_copy_to_user(arg,
+ ioaddr + FEPCI_MAILBOX_OFFSETT,
+ 4, 1);
+ if (likely(retval == 0))
+ /* lowest byte = 0x7 */
+ retval = __put_user(0x7, (char __user *)arg);
+ }
+ mutex_unlock(&card->mutex);
+ break;
+ case FEPCI_IOCTL_ALARM_MANAGER:
+ interruptible_sleep_on(&(card->alarm_manager_wait_q));
+ return retval;
+ case FEPCI_IOCTL_STREAM_BUFSIZE:
+ mutex_lock(&card->mutex);
+ {
+ struct fepci_ch_private *fp =
+ card->ch_privates[arg & 3ul];
+ if (fp->in_stream_mode)
+ retval = -EBUSY;
+ else
+ fp->bufsize_order = arg >> 2;
+ }
+ mutex_unlock(&card->mutex);
+ break;
+ case FEPCI_IOCTL_STREAM_UNITSIZE:
+ mutex_lock(&card->mutex);
+ {
+ struct fepci_ch_private *fp =
+ card->ch_privates[arg & 3ul];
+ if (fp->in_stream_mode)
+ retval = -EBUSY;
+ else
+ fp->fake_unit_sz_order = arg >> 2;
+ }
+ mutex_unlock(&card->mutex);
+ break;
+ case FEPCI_IOCTL_STREAM_OPEN:
+ return fepci_stream_open(card, card->ch_privates[arg]);
+ case FEPCI_IOCTL_STREAM_START:
+ return fepci_stream_start(card, card->ch_privates[arg]);
+ case FEPCI_IOCTL_STREAM_CLOSE:
+ return fepci_stream_close(card, card->ch_privates[arg]);
+ default:
+ return -ENOTTY;
+ }
+ return retval;
+}
+
+static int fepci_register_char_device(void)
+{
+ int error =
+ register_chrdev(0u /* dynamic */, fepci_name, &fepci_char_fops);
+ if (unlikely(error < 0))
+ printk(KERN_WARNING
+ "%s: unable to register char device\n", fepci_name);
+ return error;
+}
+
+static void fepci_unregister_char_device(void)
+{
+ unregister_chrdev(major, fepci_name);
+}
+
+/* char operations end */
+
+/* stream operations start */
+
+static irqreturn_t fepci_stream_interrupt(int irq, void *dev_instance);
+
+static int fepci_stream_close(struct fepci_card_private *cp,
+ struct fepci_ch_private *fp)
+{
+ int error;
+ mutex_lock(&cp->mutex);
+ error = fepci_stream_close_down(cp, fp);
+ mutex_unlock(&cp->mutex);
+ return error;
+}
+
+static int fepci_stream_open(struct fepci_card_private *cp,
+ struct fepci_ch_private *fp)
+{
+ unsigned tx_pages, rx_pages, tx_order, rx_order;
+ unsigned int u;
+ mutex_lock(&cp->mutex);
+
+ if (unlikely(fp->in_eth_mode)) {
+ dev_warn(&fp->this_dev->dev,
+ "Interface is in Ethernet mode: "
+ "cannot open stream interface\n");
+ mutex_unlock(&cp->mutex);
+ return -EBUSY;
+ }
+ if (unlikely(fp->in_stream_mode)) {
+ mutex_unlock(&cp->mutex);
+ return 0;
+ }
+
+ if (unlikely(cp->removed)) {
+ mutex_unlock(&cp->mutex);
+ return -ENXIO;
+ }
+
+ fp->bufsize = 1u << fp->bufsize_order;
+
+ if (unlikely(fp->fake_unit_sz_order < 5u)) {
+ dev_warn(&fp->this_dev->dev,
+ "Unit size has to be at least 32 bytes\n");
+INVALID:
+ mutex_unlock(&cp->mutex);
+ return -EINVAL;
+ }
+
+ if (unlikely(fp->fake_unit_sz_order >= fp->bufsize_order)) {
+ dev_warn(&fp->this_dev->dev,
+ "Bufsize has to be greater than unit size\n");
+ goto INVALID;
+ }
+
+ if (fp->fake_unit_sz_order >= MAX_UNIT_SZ_ORDER)
+ fp->unit_sz_order = MAX_UNIT_SZ_ORDER;
+ else
+ fp->unit_sz_order = fp->fake_unit_sz_order;
+
+ fp->fake_unit_sz = 1u << fp->fake_unit_sz_order;
+ fp->unit_sz = 1u << fp->unit_sz_order;
+ fp->units = 1u << (fp->bufsize_order - fp->unit_sz_order);
+ fp->fake_units = 1u << (fp->bufsize_order - fp->fake_unit_sz_order);
+
+ /* Reserve memory. */
+ if (fp->bufsize_order < PAGE_SHIFT) {
+ rx_order = 0u;
+ tx_order = 0u;
+ rx_pages = 1u;
+ tx_pages = 1u;
+ } else {
+ tx_order = fp->bufsize_order - PAGE_SHIFT;
+ tx_pages = 1u << tx_order;
+ rx_order = tx_order + 1u;
+ rx_pages = 1u << rx_order;
+ }
+ fp->in_stream_mode = true;
+ fp->tx_buffer = (u32 *)__get_free_pages(GFP_KERNEL, tx_order);
+ if (unlikely(fp->tx_buffer == NULL))
+ goto NO_MEMORY;
+ fp->rx_buffer = (u32 *)__get_free_pages(GFP_KERNEL, rx_order);
+ if (unlikely(fp->rx_buffer == NULL)) {
+NO_MEMORY:
+ dev_warn(&fp->this_dev->dev,
+ "unable to allocate memory for buffers\n");
+ fepci_stream_close_down(cp, fp);
+ mutex_unlock(&cp->mutex);
+ return -ENOMEM;
+ }
+
+ for (u = 0u; u < fp->bufsize / 4u; u++)
+ fp->tx_buffer[u] = 0xffffffff;
+
+ *USER_RX_S_POINTER(cp->card_number, fp->channel_number, stream_pointers)
+ = 0ul;
+ *USER_TX_S_POINTER(cp->card_number, fp->channel_number, stream_pointers)
+ = 0ul;
+ *USER_RX_S_FAKE_POINTER(cp->card_number,
+ fp->channel_number, stream_pointers) = 0ul;
+ *USER_TX_S_FAKE_POINTER(cp->card_number,
+ fp->channel_number, stream_pointers) = 0ul;
+
+ /* Init the ring buffers. */
+ for (u = 0u; u < MAX_RX_UNITS; u++)
+ fp->rx_unit[u] = fp->rx_buffer + fp->unit_sz * u / sizeof(u32);
+ for (u = 0u; u < MAX_TX_UNITS; u++)
+ fp->tx_unit[u] = fp->tx_buffer + fp->unit_sz * u / sizeof(u32);
+
+ for (u = 0u; u < RX_RING_SIZE; u++) {
+ writel(0u, &fp->rx_desc[u].desc_a);
+ writel(0u, &fp->rx_desc[u].desc_b);
+ }
+ for (u = 0u; u < TX_RING_SIZE; u++) {
+ writel(0u, &fp->tx_desc[u].desc_a);
+ writel(0u, &fp->tx_desc[u].desc_b);
+ }
+ mutex_unlock(&cp->mutex);
+ return 0;
+}
+
+static int fepci_stream_start(struct fepci_card_private *cp,
+ struct fepci_ch_private *fp)
+{
+ unsigned i;
+ uint8_t __iomem *ioaddr = cp->ioaddr;
+ struct net_device *dev = fp->this_dev;
+ mutex_lock(&cp->mutex);
+ if (unlikely(!fp->in_stream_mode)) {
+ mutex_unlock(&cp->mutex);
+ dev_warn(&dev->dev,
+ "interface is not in stream mode: "
+ "streaming cannot be started\n");
+ return -EBUSY;
+ }
+ if (unlikely(fp->stream_on)) {
+ mutex_unlock(&cp->mutex);
+ return 0;
+ } else {
+ /* Reserve IRQ. */
+ int error = request_irq(dev->irq, &fepci_stream_interrupt,
+ IRQF_SHARED, dev->name, dev);
+ if (unlikely(error)) {
+ mutex_unlock(&cp->mutex);
+ dev_warn(&dev->dev,
+ "unable to allocate IRQ %d, error %d\n",
+ dev->irq, error);
+ return -ENOMEM;
+ }
+ }
+
+ fp->stream_on = true;
+
+ /* Sending and receiving on, start from the beginning of the buffer. */
+ fp->cur_tx_unit = 0u;
+ fp->cur_rx_unit = 0u;
+ fp->cur_tx = 0u;
+ fp->cur_rx = 0u;
+
+ /* All the descriptors ready to go: */
+ for (i = 0; i < min(RX_RING_SIZE, TX_RING_SIZE); i++) {
+ dma_addr_t address = pci_map_single(cp->pci_dev,
+ fp->
+ rx_unit[(fp->cur_rx_unit +
+ i) % fp->units],
+ fp->unit_sz,
+ PCI_DMA_FROMDEVICE);
+ if (unlikely(pci_dma_mapping_error(cp->pci_dev, address))) {
+ dev_warn(&dev->dev,
+ "failed to map reception DMA buffer\n");
+ } else {
+ unsigned next = (fp->cur_rx + i) & (RX_RING_SIZE - 1);
+ pci_unmap_addr_set(fp->rx + next, address, address);
+ writel(address, &fp->rx_desc[next].desc_a);
+ if (!(readl(&fp->rx_desc[next].desc_b) &
+ enable_transfer))
+ writel(enable_transfer,
+ &fp->rx_desc[next].desc_b);
+ }
+ address = pci_map_single(cp->pci_dev,
+ fp->tx_unit[(fp->cur_tx_unit + i) %
+ fp->units], fp->unit_sz,
+ PCI_DMA_TODEVICE);
+ if (unlikely(pci_dma_mapping_error(cp->pci_dev, address))) {
+ dev_warn(&dev->dev,
+ "failed to map transmission DMA buffer\n");
+ } else {
+ unsigned next = (fp->cur_tx + i) & (TX_RING_SIZE - 1);
+ pci_unmap_addr_set(fp->tx + next, address, address);
+ writel(address, &fp->tx_desc[next].desc_a);
+ if (!(readl_relaxed(&fp->tx_desc[next].desc_b) &
+ enable_transfer))
+ writel(enable_transfer |
+ (fp->unit_sz & frame_length),
+ &fp->tx_desc[next].desc_b);
+ }
+ }
+
+ /* irq on */
+ set_int_mask(fp->channel_number,
+ MaskFrameReceived | MaskFrameTransmitted |
+ MaskRxFifoError | MaskRxFrameDroppedError |
+ MaskTxFifoError, cp);
+ /* Start Rx and Tx channels */
+ writel(Receive_enable |
+ (Rx_fifo_threshold & RX_FIFO_THRESHOLD_STREAM_MODE),
+ ioaddr + fp->reg_rxctrl);
+ writel((Transmit_enable |
+ (Tx_desc_threshold &
+ (TX_DESC_THRESHOLD_STREAM_MODE << 8)) |
+ (Tx_fifo_threshold & TX_FIFO_THRESHOLD_STREAM_MODE)),
+ ioaddr + fp->reg_txctrl);
+ mutex_unlock(&cp->mutex);
+ return 0;
+}
+
+static inline void fepci_stream_stop(struct fepci_card_private *cp,
+ struct fepci_ch_private *fp)
+{
+ uint8_t __iomem *ioaddr = cp->ioaddr;
+ unsigned d = min(RX_RING_SIZE, TX_RING_SIZE) - 1;
+ struct net_device *dev = fp->this_dev;
+ fp->stream_on = false;
+ /* Stop Rx and Tx channels. */
+ writel(0x0, ioaddr + fp->reg_rxctrl);
+ writel(0x0, ioaddr + fp->reg_txctrl);
+
+ /* Disable interrupts by clearing the interrupt mask. */
+ set_int_mask(fp->channel_number, 0x0, cp);
+
+ /* unregister irq */
+ free_irq(dev->irq, dev);
+
+ do {
+ if (likely(!pci_dma_mapping_error(cp->pci_dev,
+ pci_unmap_addr(fp->rx + d, address))))
+ pci_unmap_single(cp->pci_dev,
+ pci_unmap_addr(fp->rx + d, address),
+ fp->unit_sz,
+ PCI_DMA_FROMDEVICE);
+ if (likely(!pci_dma_mapping_error(cp->pci_dev,
+ pci_unmap_addr(fp->tx + d, address))))
+ pci_unmap_single(cp->pci_dev,
+ pci_unmap_addr(fp->tx + d, address),
+ fp->unit_sz, PCI_DMA_TODEVICE);
+ } while (d--);
+}
+
+static int fepci_stream_close_down(struct fepci_card_private *cp,
+ struct fepci_ch_private *fp)
+{
+ unsigned rx_pages, tx_pages, rx_order, tx_order;
+ if (unlikely(!(fp->in_stream_mode)))
+ return -EBUSY;
+ fepci_stream_stop(cp, fp);
+ /* release memory */
+ if (fp->bufsize_order < PAGE_SHIFT) {
+ rx_order = 0u;
+ tx_order = 0u;
+ rx_pages = 1u;
+ tx_pages = 1u;
+ } else {
+ rx_order = fp->bufsize_order - PAGE_SHIFT + 1u;
+ rx_pages = 1u << rx_order;
+ tx_order = fp->bufsize_order - PAGE_SHIFT;
+ tx_pages = 1u << tx_order;
+ }
+ if (fp->rx_buffer) {
+ free_pages((unsigned long)fp->rx_buffer, rx_order);
+ fp->rx_buffer = NULL;
+ }
+ if (fp->tx_buffer) {
+ free_pages((unsigned long)fp->tx_buffer, tx_order);
+ fp->tx_buffer = NULL;
+ }
+ fp->in_stream_mode = false;
+ return 0;
+}
+
+static irqreturn_t fepci_stream_interrupt(int irq, void *dev_instance)
+{
+ struct net_device *dev = dev_instance;
+ struct fepci_ch_private *fp = netdev_priv(dev);
+ uint8_t __iomem *ioaddr = (uint8_t __iomem *)dev->base_addr;
+ const unsigned char channel = fp->channel_number;
+ const uint32_t intr_status = get_int_status(channel, ioaddr);
+ unsigned int temp_rx;
+ unsigned int temp_rx_unit;
+ unsigned int temp_tx;
+ unsigned int temp_tx_unit;
+ if (!intr_status)
+ return IRQ_NONE;
+ clear_int(channel, intr_status, ioaddr);
+ temp_rx = fp->cur_rx;
+ while (!(readl(&fp->rx_desc[fp->cur_rx].desc_b) & transfer_not_done)
+ /* Has been received. */ &&
+ /* Stop if made one round. */
+ temp_rx != ((fp->cur_rx + 1u) & (RX_RING_SIZE - 1u))) {
+ if (likely(!pci_dma_mapping_error(fp->this_card_priv->pci_dev,
+ pci_unmap_addr(fp->rx +
+ fp->cur_rx,
+ address))))
+ pci_unmap_single(fp->this_card_priv->pci_dev,
+ pci_unmap_addr(fp->rx + fp->cur_rx,
+ address),
+ fp->unit_sz, PCI_DMA_FROMDEVICE);
+ fp->cur_rx = (fp->cur_rx + 1u) & (RX_RING_SIZE - 1u);
+ fp->cur_rx_unit = (fp->cur_rx_unit + 1u);
+ fp->cur_rx_unit *= fp->cur_rx_unit < fp->units;
+ *USER_RX_S_POINTER(fp->this_card_priv->card_number,
+ fp->channel_number,
+ stream_pointers) = fp->cur_rx_unit;
+ *USER_RX_S_FAKE_POINTER(fp->this_card_priv->card_number,
+ fp->channel_number,
+ stream_pointers) =
+ fp->cur_rx_unit * fp->unit_sz / fp->fake_unit_sz;
+ wake_up_interruptible(&(fp->this_card_priv->stream_receive_q));
+ wake_up_interruptible(&(fp->this_card_priv->stream_both_q));
+ }
+ /* From the first uninitialized descriptor to cur_rx. */
+ temp_rx = (fp->cur_rx + 1u) & (RX_RING_SIZE - 1u);
+ temp_rx_unit = (fp->cur_rx_unit + 1);
+ temp_rx_unit *= temp_rx_unit < fp->units;
+ while (temp_rx != fp->cur_rx) {
+ uint32_t desc_b = readl(&fp->rx_desc[temp_rx].desc_b);
+ if (!(desc_b & transfer_not_done)) {
+ dma_addr_t bus_address;
+ /* Update debug counters. */
+ if (unlikely(desc_b & fifo_error)) {
+ dev->stats.rx_errors++;
+ dev->stats.rx_fifo_errors++;
+ } else if (unlikely(desc_b & size_error)) {
+ dev->stats.rx_errors++;
+ dev->stats.rx_over_errors++;
+ } else if (unlikely(desc_b & octet_error)) {
+ dev->stats.rx_errors++;
+ dev->stats.rx_length_errors++;
+ } else if (unlikely(desc_b & line_error)) {
+ dev->stats.rx_errors++;
+ dev->stats.rx_missed_errors++;
+ } else {
+ dev->stats.rx_packets++;
+ dev->stats.rx_bytes += fp->unit_sz;
+ }
+ /* Initialize the descriptor for transfer. */
+ bus_address =
+ pci_map_single(fp->this_card_priv->pci_dev,
+ fp->rx_unit[temp_rx_unit],
+ fp->unit_sz, PCI_DMA_FROMDEVICE);
+ if (likely(!pci_dma_mapping_error(fp->this_card_priv->
+ pci_dev,
+ bus_address))) {
+ pci_unmap_addr_set(fp->rx + temp_rx, address,
+ bus_address);
+ writel(bus_address,
+ &fp->rx_desc[temp_rx].desc_a);
+ writel(enable_transfer,
+ &fp->rx_desc[temp_rx].desc_b);
+ } else {
+ dev_warn(&dev->dev,
+ "failed to map DMA for reception\n");
+ }
+ }
+ temp_rx = (temp_rx + 1u) & (RX_RING_SIZE - 1u);
+ temp_rx_unit = (temp_rx_unit + 1u);
+ temp_rx_unit *= temp_rx_unit < fp->units;
+ }
+
+ temp_tx = fp->cur_tx;
+ while (!(readl_relaxed(&fp->tx_desc[fp->cur_tx].desc_b) &
+ transfer_not_done) /* Has been transmitted. */ &&
+ /* Stop if made one round. */
+ temp_tx != ((fp->cur_tx + 1u) & (TX_RING_SIZE - 1u))) {
+ if (likely(!pci_dma_mapping_error(fp->this_card_priv->pci_dev,
+ pci_unmap_addr(fp->tx +
+ fp->cur_tx,
+ address))))
+ pci_unmap_single(fp->this_card_priv->pci_dev,
+ pci_unmap_addr(fp->tx + fp->cur_tx,
+ address),
+ fp->unit_sz, PCI_DMA_TODEVICE);
+ fp->cur_tx = (fp->cur_tx + 1u) & (TX_RING_SIZE - 1u);
+ fp->cur_tx_unit = (fp->cur_tx_unit + 1u);
+ fp->cur_tx_unit *= fp->cur_tx_unit < fp->units;
+ *USER_TX_S_POINTER(fp->this_card_priv->card_number,
+ fp->channel_number,
+ stream_pointers) = fp->cur_tx_unit;
+ *USER_TX_S_FAKE_POINTER(fp->this_card_priv->
+ card_number,
+ fp->channel_number,
+ stream_pointers) =
+ fp->cur_tx_unit * fp->unit_sz / fp->fake_unit_sz;
+ wake_up_interruptible(&(fp->this_card_priv->
+ stream_transmit_q));
+ wake_up_interruptible(&(fp->this_card_priv->
+ stream_both_q));
+ }
+
+ /* From the first uninitialized descriptor to cur_tx. */
+ temp_tx = (fp->cur_tx + 1u) & (TX_RING_SIZE - 1u);
+ temp_tx_unit = (fp->cur_tx_unit + 1u);
+ temp_tx_unit *= temp_tx_unit < fp->units;
+
+ while (temp_tx != fp->cur_tx) {
+ uint32_t desc_b = readl_relaxed(&fp->tx_desc[temp_tx].desc_b);
+ if (!(desc_b & transfer_not_done)) {
+ dma_addr_t bus_address;
+ /* Update statistics. */
+ if (unlikely(desc_b & fifo_error)) {
+ dev->stats.tx_errors++;
+ dev->stats.tx_fifo_errors++;
+ } else {
+ dev->stats.tx_packets++;
+ dev->stats.tx_bytes += fp->unit_sz;
+ }
+ /* Initialize the descriptor for transfer. */
+ bus_address =
+ pci_map_single(fp->this_card_priv->pci_dev,
+ fp->tx_unit[temp_tx_unit],
+ fp->unit_sz, PCI_DMA_TODEVICE);
+ if (likely(!pci_dma_mapping_error(fp->this_card_priv->
+ pci_dev,
+ bus_address))) {
+ pci_unmap_addr_set(fp->tx + temp_tx,
+ address, bus_address);
+ writel(bus_address,
+ &fp->tx_desc[temp_tx].desc_a);
+ writel(enable_transfer |
+ (fp->unit_sz & frame_length),
+ &fp->tx_desc[temp_tx].desc_b);
+ } else {
+ dev_warn(&dev->dev,
+ "failed to map transmission DMA\n");
+ }
+ }
+ temp_tx = (temp_tx + 1u) & (TX_RING_SIZE - 1u);
+ temp_tx_unit = (temp_tx_unit + 1u);
+ temp_tx_unit *= temp_tx_unit < fp->units;
+ }
+
+ return IRQ_HANDLED;
+}
+
+/* stream operations end */
+
+static inline u16 get_common_reg_word(uint8_t __iomem *ioaddr,
unsigned offsett)
+{
+ u16 word = readw_relaxed(ioaddr + FEPCI_IDENTIFICATION_OFFSETT +
+ (offsett << 1));
+ return word;
+}
+
+static irqreturn_t alarm_manager_interrupt(int irq, void *pointer)
+{
+ struct fepci_card_private *card_private = pointer;
+ uint8_t __iomem *ioaddr_reg_custom = card_private->ioaddr + reg_custom;
+ if (readl_relaxed(ioaddr_reg_custom) & AM_interrupt_status) {
+ /* clear interrupt (zero everything but the mask bit) */
+ writel(AM_interrupt_mask, ioaddr_reg_custom);
+ /* wake queue */
+ wake_up(&(card_private->alarm_manager_wait_q));
+ return IRQ_HANDLED;
+ } else {
+ return IRQ_NONE;
+ }
+}
+
+static int __devinit fepci_init_one(struct pci_dev *pdev,
+ const struct pci_device_id *ent)
+{
+ int i;
+ unsigned j;
+ uint8_t __iomem *ioaddr;
+ unsigned position = 0u;
+ struct fepci_card_private *card_private, **cards, **old;
+ for (; position < find_cnt; position++) {
+ card_private = card_privates[position];
+ if (card_private->pci_dev == NULL) {
+ card_private->pci_dev = pdev;
+ goto FOUND;
+ }
+ }
+ if (unlikely(find_cnt == 256u))
+ return -ENOMEM;
+ cards = kmalloc((find_cnt + 1u) * sizeof(struct fepci_card_private *),
+ GFP_KERNEL);
+ if (cards == NULL)
+ return -ENOMEM;
+ card_private = kzalloc(sizeof(struct fepci_card_private), GFP_KERNEL);
+ if (card_private == NULL) {
+ kfree(cards);
+ return -ENOMEM;
+ }
+ card_private->removed = true;
+ init_waitqueue_head(&(card_private->alarm_manager_wait_q));
+ init_waitqueue_head(&(card_private->stream_transmit_q));
+ init_waitqueue_head(&(card_private->stream_receive_q));
+ init_waitqueue_head(&(card_private->stream_both_q));
+ card_private->card_number = find_cnt;
+ mutex_init(&card_private->mutex);
+ cards[find_cnt] = card_private;
+ memcpy(cards, card_privates,
+ sizeof(struct fepci_card_private *) * find_cnt);
+ old = card_privates;
+ rcu_assign_pointer(card_privates, cards);
+ synchronize_rcu();
+ kfree(old);
+ find_cnt++;
+FOUND:
+ if (PCI_FUNC(pdev->devfn) != 0u)
+ return -ENXIO;
+ i = pci_enable_device(pdev);
+ if (unlikely(i)) {
+ dev_warn(&pdev->dev, "enabling error %d\n", i);
+ return i;
+ }
+ pci_set_master(pdev);
+ i = pci_request_regions(pdev, fepci_name);
+ if (unlikely(i)) {
+ dev_warn(&pdev->dev, "requesting regions error %d\n", i);
+ pci_disable_device(pdev);
+ return i;
+ }
+ i = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
+ if (unlikely(i)) {
+ dev_warn(&pdev->dev, "no suitable DMA available\n");
+ goto ERR_1;
+ }
+ if (unlikely(pci_resource_len(pdev, 0u) < FEPCI_SIZE)) {
+ dev_warn(&pdev->dev, "resource length less than required %u\n",
+ FEPCI_SIZE);
+ i = -ENXIO;
+ goto ERR_1;
+ }
+ if (unlikely(!(pci_resource_flags(pdev, 0u) & IORESOURCE_MEM))) {
+ i = -ENXIO;
+ goto ERR_1;
+ }
+ ioaddr = pci_iomap(pdev, 0u, FEPCI_SIZE);
+ if (unlikely(!ioaddr)) {
+ dev_warn(&pdev->dev, "mapping failed\n");
+ i = -ENOMEM;
+ goto ERR_1;
+ }
+ pci_set_drvdata(pdev, card_private);
+ card_private->ioaddr = ioaddr;
+ card_private->pci_dev = pdev;
+ fillregisterswith_00(ioaddr);
+ i = request_irq(pdev->irq, &alarm_manager_interrupt,
+ IRQF_SHARED, fepci_alarm_manager_name, card_private);
+ if (unlikely(i)) {
+ dev_warn(&pdev->dev,
+ "unable to allocate alarm manager IRQ %u: %d\n",
+ pdev->irq, i);
+ goto ERR_2;
+ }
+ /* Alarm manager interrupt on: */
+ writel(AM_interrupt_mask, ioaddr + reg_custom);
+ for (j = 0; j < CHANNELS; j++) {
+ char *name;
+ struct fepci_ch_private *fp;
+ struct net_device *dev =
+ alloc_etherdev(sizeof(struct fepci_ch_private));
+ struct fepci_real_mailbox __iomem *real_mailbox =
+ (struct fepci_real_mailbox __iomem *)
+ (ioaddr + FEPCI_MAILBOX_OFFSETT);
+ unsigned long waituntil;
+ uint8_t *address = dev->dev_addr;
+ if (unlikely(!dev)) {
+ dev_warn(&pdev->dev,
+ "cannot allocate Ethernet device\n");
+ continue;
+ }
+ fp = netdev_priv(dev);
+ card_private->ch_privates[j] = fp;
+ name = dev->name;
+ /* name := xxx01..xxxnn */
+ memcpy(name, fepci_netdev_name, 6u);
+ /* dev->name[3]= j+'0'; channel number -> ascii */
+ /* minor number -> ascii */
+ name[4] = ((position * CHANNELS + j) % 10u) + '0';
+ /* minor number -> ascii */
+ name[3] = ((position * CHANNELS + j) / 10u) + '0';
+ clear_int(j, IntrAllInts, ioaddr);
+ ether_setup(dev);
+ /* HW_ADDR is got using the mailbox: */
+ set_semafore(real_mailbox, RETINA_RESERVED_PC);
+ writel(0x1 /* size */ + (0x8 << 8) /* get mac command */,
+ &real_mailbox->Size_Command);
+ set_semafore(real_mailbox, RETINA_READY_UCTRL_REPLY);
+ waituntil = jiffies + HZ;
+ while (time_before(jiffies, waituntil) &&
+ get_semafore(real_mailbox) != RETINA_READY_PC)
+ msleep(1u);
+ if (get_semafore(real_mailbox) == RETINA_READY_PC) {
+ u32 __iomem *data = real_mailbox->Data + 3u * j;
+ address[5] = readb_relaxed(data);
+ address[4] = readb_relaxed((u8 __iomem *)data + 1u);
+ address[3] = readb_relaxed(++data);
+ address[2] = readb_relaxed((u8 __iomem *)data + 1u);
+ address[1] = readb_relaxed(++data);
+ address[0] = readb_relaxed((u8 __iomem *)data + 1u);
+ if (unlikely(!is_valid_ether_addr(address)))
+ goto RANDOM;
+ } else {
+RANDOM: random_ether_addr(address);
+ }
+ set_semafore(real_mailbox, RETINA_IDLE);
+ dev->addr_len = 6u;
+ dev->base_addr = (unsigned long)ioaddr;
+ dev->irq = pdev->irq;
+ fp->rx_desc = (struct fepci_desc __iomem *)
+ (ioaddr + first_rx_desc + j * to_next_ch_rx_desc);
+ fp->tx_desc = (struct fepci_desc __iomem *)
+ (ioaddr + first_tx_desc + j * to_next_ch_tx_desc);
+ fp->channel_number = j; /* The channel in this device. */
+ fp->this_dev = dev;
+ fp->this_card_priv = card_private;
+ fp->cur_tx = 0u;
+ fp->in_stream_mode = false;
+ fp->in_eth_mode = false;
+ fp->reg_rxctrl = reg_first_rxctrl + j * to_next_rxctrl;
+ fp->reg_txctrl = reg_first_txctrl + j * to_next_txctrl;
+ /* The specific entries in the device structure. */
+ dev->open = &fepci_open;
+ dev->hard_start_xmit = &fepci_start_xmit;
+ dev->stop = &fepci_close;
+ dev->tx_timeout = fepci_tx_timeout;
+ dev->watchdog_timeo = TX_TIMEOUT;
+ tasklet_init(&fp->transmission, retina_tx, (unsigned long)fp);
+ dev->flags |= IFF_POINTOPOINT;
+ dev->flags &= ~(IFF_BROADCAST | IFF_MULTICAST);
+ SET_NETDEV_DEV(dev, &pdev->dev);
+ i = register_netdev(dev);
+ if (unlikely(i)) {
+ dev_warn(&dev->dev, "register_netdev failed: %d\n", i);
+ continue;
+ }
+ }
+ smp_wmb(); /* Set removed false after initialization. */
+ card_private->removed = false;
+ return 0;
+ERR_2:
+ iounmap(ioaddr);
+ card_private->pci_dev = NULL;
+ pci_set_drvdata(pdev, NULL);
+ERR_1:
+ pci_disable_device(pdev);
+ pci_release_regions(pdev);
+ return i;
+}
+
+/* Initialize the reception and transmission ring buffers. */
+static inline void fepci_init_ring(struct net_device *dev)
+{
+ struct fepci_ch_private *fp = netdev_priv(dev);
+ unsigned d;
+
+ for (d = 0u; d < RX_RING_SIZE; d++) {
+ struct sk_buff *skb = __netdev_alloc_skb(dev,
+ RETINA_DMA_SIZE +
+ NET_IP_ALIGN,
+ GFP_KERNEL);
+ if (unlikely(skb == NULL)) {
+ZERO:
+ writel(0u, &fp->rx_desc[d].desc_a);
+ writel(0u, &fp->rx_desc[d].desc_b);
+ } else {
+ dma_addr_t bus_address;
+ skb_reserve(skb, NET_IP_ALIGN);
+ bus_address =
+ pci_map_single(fp->this_card_priv->pci_dev,
+ skb->data, RETINA_MRU,
+ PCI_DMA_FROMDEVICE);
+ if (likely(!pci_dma_mapping_error(fp->this_card_priv->
+ pci_dev,
+ bus_address))) {
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ fp->rx[d].skbuff = skb;
+ pci_unmap_addr_set(fp->rx + d, address,
+ bus_address);
+ writel(bus_address, &fp->rx_desc[d].desc_a);
+ writel(enable_transfer, &fp->rx_desc[d].desc_b);
+ } else {
+ dev_kfree_skb(skb);
+ goto ZERO;
+ }
+ }
+ }
+
+ for (d = 0u; d < TX_RING_SIZE; d++) {
+ fp->tx[d].skbuff = NULL;
+ writel(0u, &fp->tx_desc[d].desc_a); /* No address. */
+ /* No transfer enable, no interrupt enable. */
+ writel(0u, &fp->tx_desc[d].desc_b);
+ }
+}
+
+static int fepci_open_down(struct net_device *dev, struct fepci_ch_private *fp)
+{
+ uint8_t __iomem *ioaddr = (uint8_t __iomem *)dev->base_addr;
+ struct fepci_card_private *cp = fp->this_card_priv;
+ if (unlikely(cp->removed)) {
+ return -ENXIO;
+ } else {
+ int i = request_irq(dev->irq, &fepci_interrupt,
+ IRQF_SHARED, dev->name, dev);
+ if (i) {
+ dev_warn(&dev->dev,
+ "unable to allocate IRQ %d, error 0x%x\n",
+ dev->irq, i);
+ return i;
+ }
+ }
+
+ fp->in_eth_mode = true;
+
+ fepci_init_ring(dev);
+
+ fp->cur_rx = 0u;
+ fp->cur_tx = 0u;
+
+ netif_carrier_off(dev);
+
+ /* Enable interrupts by setting the interrupt mask. */
+
+ set_int_mask(fp->channel_number,
+ MaskFrameReceived | MaskFrameTransmitted |
+ MaskRxFifoError | MaskRxFrameDroppedError |
+ MaskTxFifoError, cp);
+
+ /* Start Rx and Tx channels. */
+ writel(Receive_enable |
+ (Rx_fifo_threshold & RX_FIFO_THRESHOLD_PACKET_MODE),
+ ioaddr + fp->reg_rxctrl);
+ writel((Transmit_enable |
+ (Tx_desc_threshold &
+ (TX_DESC_THRESHOLD_PACKET_MODE << 8)) |
+ (Tx_fifo_threshold & TX_FIFO_THRESHOLD_PACKET_MODE)),
+ ioaddr + fp->reg_txctrl);
+
+ netif_start_queue(dev);
+
+ init_timer(&fp->timer);
+ fp->timer.expires = jiffies + HZ;
+ fp->timer.data = (unsigned long)dev;
+ fp->timer.function = &fepci_timer;
+ add_timer(&fp->timer);
+
+ return 0;
+}
+
+static int fepci_open(struct net_device *dev)
+{
+ struct fepci_ch_private *fp = netdev_priv(dev);
+ struct fepci_card_private *cp = fp->this_card_priv;
+ int error;
+ mutex_lock(&cp->mutex);
+ if (unlikely(fp->in_stream_mode))
+ fepci_stream_close_down(cp, fp);
+ error = fepci_open_down(dev, fp);
+ mutex_unlock(&cp->mutex);
+ return error;
+}
+
+static void fepci_timer(unsigned long data)
+{
+ struct net_device *dev = (struct net_device *)data;
+ struct fepci_ch_private *fp = netdev_priv(dev);
+
+ if ((get_common_reg_word(fp->this_card_priv->ioaddr, 0x72) >>
+ fp->channel_number) & 1u)
+ netif_carrier_off(dev);
+ else
+ netif_carrier_on(dev);
+
+ if (fp->in_eth_mode)
+ mod_timer(&fp->timer, jiffies + 5ul * HZ);
+}
+
+static void fepci_tx_timeout(struct net_device *dev)
+{
+ struct fepci_ch_private *fp = netdev_priv(dev);
+ tasklet_schedule(&fp->transmission);
+}
+
+static int fepci_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct fepci_ch_private *fp;
+ unsigned cur_tx;
+ unsigned next;
+ unsigned tx_length = skb->len;
+ dma_addr_t bus_address;
+
+ if (unlikely(tx_length < ETH_ZLEN)) {
+ if (unlikely(skb_padto(skb, ETH_ZLEN))) {
+ dev->stats.tx_dropped++;
+ return NETDEV_TX_OK;
+ }
+ tx_length = ETH_ZLEN;
+ }
+ fp = netdev_priv(dev);
+ bus_address = pci_map_single(fp->this_card_priv->pci_dev, skb->data,
+ tx_length, PCI_DMA_TODEVICE);
+ cur_tx = fp->cur_tx;
+ if (likely(!pci_dma_mapping_error(fp->this_card_priv->pci_dev,
+ bus_address))) {
+ struct fepci_desc __iomem *descriptor;
+ pci_unmap_addr_set(fp->tx + cur_tx, address, bus_address);
+ descriptor = &fp->tx_desc[cur_tx];
+ writel(bus_address, &descriptor->desc_a);
+ writel((tx_length & frame_length) | enable_transfer,
+ &descriptor->desc_b);
+ } else {
+ return NETDEV_TX_BUSY;
+ }
+
+ fp->tx[cur_tx].skbuff = skb;
+
+ /* Calculate the next transmission descriptor entry. */
+ next = (cur_tx + 1u) & (TX_RING_SIZE - 1u);
+ fp->cur_tx = next;
+ /* If the next descriptor is busy, discontinue taking new ones. */
+ if (fp->tx[next].skbuff != NULL)
+ netif_stop_queue(dev);
+ dev->trans_start = jiffies;
+
+ return NETDEV_TX_OK;
+}
+
+static void retina_tx(unsigned long channel)
+{
+ struct fepci_ch_private *fp = (struct fepci_ch_private *)channel;
+ struct net_device *dev = fp->this_dev;
+ struct fepci_desc __iomem *tx_desc = fp->tx_desc;
+ unsigned d = 0u;
+ struct netdev_queue *txq;
+ do {
+ uint32_t desc_b;
+ struct sk_buff *skb = fp->tx[d].skbuff;
+ struct fepci_desc __iomem *desc;
+ if (skb == NULL)
+ continue;
+ desc = tx_desc + d;
+ desc_b = readl_relaxed(&desc->desc_b);
+ if (!(desc_b & transfer_not_done)) { /* Has been sent. */
+ unsigned int len = skb->len;
+ pci_unmap_single(fp->this_card_priv->pci_dev,
+ pci_unmap_addr(fp->tx + d, address),
+ len, PCI_DMA_TODEVICE);
+ dev_kfree_skb(skb);
+ fp->tx[d].skbuff = NULL;
+ if (unlikely(desc_b & fifo_error)) {
+ dev->stats.tx_errors++;
+ dev->stats.tx_fifo_errors++;
+ } else {
+ dev->stats.tx_packets++;
+ dev->stats.tx_bytes += len;
+ }
+ }
+ } while (d++ < TX_RING_SIZE - 1u);
+ txq = netdev_get_tx_queue(dev, 0u);
+ if (__netif_tx_trylock(txq)) {
+ unsigned next = fp->cur_tx;
+ if (netif_queue_stopped(dev) &&
+ fp->tx[next].skbuff == NULL &&
+ fp->in_eth_mode)
+ netif_wake_queue(dev);
+ __netif_tx_unlock(txq);
+ } else {
+ tasklet_schedule(&fp->transmission);
+ }
+}
+
+static inline void fepci_rx(struct fepci_ch_private *fp, struct
net_device *dev)
+{
+ unsigned d, old_cur_rx = fp->cur_rx;
+ unsigned last = (old_cur_rx + RX_RING_SIZE - 1u) & (RX_RING_SIZE - 1u);
+ for (d = old_cur_rx; d != last; d = (d + 1u) & (RX_RING_SIZE - 1u)) {
+ uint32_t desc_b;
+ struct sk_buff **rx_skbuff = &fp->rx[d].skbuff;
+ struct sk_buff *skb = *rx_skbuff;
+ struct fepci_desc __iomem *rx_desc = fp->rx_desc + d;
+ if (unlikely(skb == NULL))
+ goto RESERVE;
+ desc_b = readl(&rx_desc->desc_b);
+ if (!(desc_b & transfer_not_done)) { /* Transfer done. */
+ uint32_t length;
+ fp->cur_rx = (d + 1u) & (RX_RING_SIZE - 1u);
+ if (unlikely(desc_b & (fifo_error | size_error |
+ crc_error | octet_error |
+ line_error))) {
+ if (desc_b & fifo_error)
+ dev->stats.rx_fifo_errors++;
+ else if (desc_b & size_error)
+ dev->stats.rx_over_errors++;
+ else if (desc_b & crc_error)
+ dev->stats.rx_crc_errors++;
+ else if (desc_b & octet_error)
+ dev->stats.rx_length_errors++;
+ else
+ dev->stats.rx_missed_errors++;
+ENABLE_TRANSFER: writel(enable_transfer, &rx_desc->desc_b);
+ dev->stats.rx_errors++;
+ continue;
+ }
+ length = (desc_b & frame_length) - 4u;
+ if (unlikely(length > RETINA_MRU)) {
+ dev->stats.rx_over_errors++;
+ goto ENABLE_TRANSFER;
+ }
+ pci_unmap_single(fp->this_card_priv->pci_dev,
+ pci_unmap_addr(fp->rx + d, address),
+ RETINA_MRU, PCI_DMA_FROMDEVICE);
+ __skb_put(skb, length);
+ skb->protocol = eth_type_trans(skb, dev);
+ if (dev->flags & IFF_POINTOPOINT) {
+ /* Everything received is for us. */
+ if (dev->flags & IFF_NOARP) {
+ /* NOARP applied ->
+ * destination MAC addresses
+ * are bogus. */
+ if (skb->pkt_type ==
+ PACKET_OTHERHOST)
+ skb->pkt_type =
+ PACKET_HOST;
+ } else {
+ /* NOARP not applied ->
+ * destination MAC addresses are
+ * broadcast. */
+ if (skb->pkt_type ==
+ PACKET_BROADCAST)
+ skb->pkt_type =
+ PACKET_HOST;
+ } /* IFF_NOARP */
+ } /* IFF_POINTOPOINT */
+ netif_rx(skb);
+ dev->stats.rx_bytes += length;
+ dev->stats.rx_packets++;
+ dev->last_rx = jiffies;
+ /* reserve a new one */
+RESERVE: skb = netdev_alloc_skb(dev, RETINA_DMA_SIZE +
+ NET_IP_ALIGN);
+ if (unlikely(skb == NULL)) {
+ *rx_skbuff = NULL;
+ continue; /* Better luck next round. */
+ } else {
+ dma_addr_t address;
+ skb_reserve(skb, NET_IP_ALIGN);
+ address = pci_map_single(fp->this_card_priv->
+ pci_dev, skb->data,
+ RETINA_MRU,
+ PCI_DMA_FROMDEVICE);
+ if (likely(!pci_dma_mapping_error(fp->
+ this_card_priv->pci_dev,
+ address))) {
+ pci_unmap_addr_set(fp->rx + d,
+ address, address);
+ *rx_skbuff = skb;
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ writel(address, &rx_desc->desc_a);
+ writel(enable_transfer,
+ &rx_desc->desc_b);
+ } else {
+ *rx_skbuff = NULL;
+ dev_kfree_skb_irq(skb);
+ dev_warn(&dev->dev,
+ "failed to map DMA\n");
+ }
+ }
+ }
+ }
+}
+
+static irqreturn_t fepci_interrupt(int irq, void *dev_instance)
+{
+ struct net_device *dev = dev_instance;
+ uint8_t __iomem *ioaddr = (uint8_t __iomem *)dev->base_addr;
+ struct fepci_ch_private *fp = netdev_priv(dev);
+ const unsigned char channel = fp->channel_number;
+ const uint32_t intr_status = get_int_status(channel, ioaddr);
+
+ if (!intr_status)
+ return IRQ_NONE;
+ clear_int(channel, intr_status, ioaddr);
+
+ if (intr_status &
+ (IntrFrameReceived | IntrRxFifoError | IntrRxFrameDroppedError))
+ fepci_rx(fp, dev);
+ if (intr_status & IntrFrameTransmitted)
+ tasklet_schedule(&fp->transmission);
+ return IRQ_HANDLED;
+}
+
+static void fepci_close_down(struct net_device *dev,
+ struct fepci_ch_private *fp,
+ struct fepci_card_private *card)
+{
+ unsigned d;
+ uint8_t __iomem *ioaddr;
+ struct pci_dev *pdev;
+ if (unlikely(!fp->in_eth_mode))
+ return;
+ /* Disable interrupts by clearing the interrupt mask. */
+ set_int_mask(fp->channel_number, 0x0, card);
+
+ /* Stop the transmission and reception processes. */
+ ioaddr = (uint8_t __iomem *)dev->base_addr;
+ writel(0x0, ioaddr + fp->reg_rxctrl);
+ writel(0x0, ioaddr + fp->reg_txctrl);
+ fp->in_eth_mode = false;
+ smp_wmb(); /* Prevent restarting the timer by setting the mode false. */
+ del_timer_sync(&fp->timer);
+
+ free_irq(dev->irq, dev);
+
+ tasklet_kill(&fp->transmission);
+ netif_tx_disable(dev);
+ pdev = card->pci_dev;
+ /* Free all the reception struct sk_buffs. */
+ for (d = 0u; d < RX_RING_SIZE; d++) {
+ struct sk_buff *skb = fp->rx[d].skbuff;
+ if (skb != NULL) {
+ pci_unmap_single(pdev,
+ pci_unmap_addr(fp->rx + d, address),
+ RETINA_MRU, PCI_DMA_FROMDEVICE);
+ dev_kfree_skb(skb);
+ fp->rx[d].skbuff = NULL;
+ }
+ }
+ /* Free all the transmission sk_buffs. */
+ for (d = 0u; d < TX_RING_SIZE; d++) {
+ struct sk_buff *skb = fp->tx[d].skbuff;
+ if (skb != NULL) {
+ pci_unmap_single(pdev,
+ pci_unmap_addr(fp->tx + d, address),
+ skb->len, PCI_DMA_TODEVICE);
+ dev_kfree_skb(skb);
+ fp->tx[d].skbuff = NULL;
+ }
+ }
+}
+
+static int fepci_close(struct net_device *dev)
+{
+ struct fepci_ch_private *fp = netdev_priv(dev);
+ struct fepci_card_private *card = fp->this_card_priv;
+ if (unlikely(!netif_device_present(dev)))
+ return -ENODEV;
+ fepci_close_down(dev, fp, card);
+ return 0;
+}
+
+static void alarm_off(uint8_t __iomem *ioaddr, unsigned int irq)
+{
+ uint8_t __iomem *ioaddr_reg_custom = ioaddr + reg_custom;
+ do {
+ /* Turn the alarm manager interrupt off. */
+ writel(0u, ioaddr_reg_custom);
+ synchronize_irq(irq);
+ } while (readl_relaxed(ioaddr_reg_custom) & AM_interrupt_mask);
+}
+
+static void fepci_remove_one(struct pci_dev *pdev)
+{
+ struct fepci_card_private *cardp = pci_get_drvdata(pdev);
+ unsigned int c;
+ uint8_t __iomem *ioaddr = cardp->ioaddr;
+ unsigned int irq = pdev->irq;
+ cardp->removed = true;
+ alarm_off(ioaddr, irq);
+
+ for (c = 0u; c < CHANNELS; c++) {
+ struct fepci_ch_private *fp = cardp->ch_privates[c];
+ struct net_device *dev = fp->this_dev;
+ if (unlikely(dev == NULL))
+ continue;
+ unregister_netdev(dev);
+ fepci_stream_close(cardp, fp);
+ free_netdev(dev);
+ cardp->ch_privates[c] = NULL;
+ }
+ free_irq(irq, cardp);
+
+ pci_set_drvdata(pdev, NULL);
+
+ cardp->pci_dev = NULL;
+
+ iounmap(ioaddr);
+
+ pci_disable_device(pdev);
+ pci_release_regions(pdev);
+}
+
+#ifdef CONFIG_PM
+static int fepci_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+ struct fepci_card_private *cardp = pci_get_drvdata(pdev);
+ unsigned channel = 0u;
+ unsigned irq = pdev->irq;
+ cardp->removed = true;
+ do {
+ struct fepci_ch_private *fp = cardp->ch_privates[channel];
+ struct net_device *dev = fp->this_dev;
+ bool in_eth_mode;
+ bool in_stream_mode;
+ bool stream_on;
+ if (unlikely(dev == NULL))
+ continue;
+ netif_device_detach(dev);
+ in_eth_mode = fp->in_eth_mode;
+ in_stream_mode = fp->in_stream_mode;
+ stream_on = fp->stream_on;
+ rtnl_lock();
+ if (in_eth_mode)
+ fepci_close_down(fp->this_dev, fp, cardp);
+ else if (in_stream_mode)
+ fepci_stream_close(cardp, fp);
+ rtnl_unlock();
+ fp->in_eth_mode = in_eth_mode;
+ fp->in_stream_mode = in_stream_mode;
+ fp->stream_on = stream_on;
+ } while (channel++ < CHANNELS - 1u);
+ alarm_off(cardp->ioaddr, irq);
+ /* Disable IRQ */
+ free_irq(irq, cardp);
+ cardp->pci_dev = NULL;
+ pci_save_state(pdev);
+ /* Disable IO/bus master/irq router */
+ pci_disable_device(pdev);
+ pci_set_power_state(pdev, pci_choose_state(pdev, state));
+ return 0;
+}
+
+static int fepci_resume(struct pci_dev *pdev)
+{
+ struct fepci_card_private *cardp = pci_get_drvdata(pdev);
+ unsigned channel;
+ int error;
+ unsigned irq;
+ pci_set_power_state(pdev, PCI_D0);
+ pci_restore_state(pdev);
+ /* Device's IRQ possibly is changed, driver should take care. */
+ error = pci_enable_device(pdev);
+ if (unlikely(error))
+ return error;
+ pci_set_master(pdev);
+ /* Driver specific operations. */
+ irq = pdev->irq;
+ cardp->pci_dev = pdev;
+ error = request_irq(pdev->irq, &alarm_manager_interrupt,
+ IRQF_SHARED, fepci_alarm_manager_name, cardp);
+ if (unlikely(error))
+ return error;
+ /* Turn alarm manager interrupt on. */
+ writel(AM_interrupt_mask, cardp->ioaddr + reg_custom);
+ channel = 0u;
+ cardp->removed = false;
+ do {
+ struct fepci_ch_private *fp = cardp->ch_privates[channel];
+ struct net_device *dev = fp->this_dev;
+ if (unlikely(dev == NULL))
+ continue;
+ dev->irq = irq;
+ rtnl_lock();
+ if (fp->in_eth_mode) {
+ int open = fepci_open_down(dev, fp);
+ if (unlikely(open))
+ error = open;
+ } else if (fp->in_stream_mode) {
+ int open;
+ fp->in_stream_mode = false;
+ open = fepci_stream_open(cardp, fp);
+ if (unlikely(open))
+ error = open;
+ if (fp->stream_on) {
+ fp->stream_on = false;
+ open = fepci_stream_start(cardp, fp);
+ if (unlikely(open))
+ error = open;
+ }
+ }
+ rtnl_unlock();
+ netif_device_attach(dev);
+ } while (channel++ < CHANNELS - 1u);
+ return error;
+}
+#endif
+
+static struct pci_driver fepci_driver = {
+ .name = fepci_name,
+ .id_table = fepci_pci_tbl,
+ .probe = fepci_init_one,
+ .remove = fepci_remove_one,
+#ifdef CONFIG_PM
+ .suspend = fepci_suspend,
+ .resume = fepci_resume
+#endif
+};
+
+static int __init fepci_init(void)
+{
+ stream_pointers = get_zeroed_page(GFP_KERNEL);
+ if (unlikely(stream_pointers == 0ul))
+ return -ENOMEM;
+ major = pci_register_driver(&fepci_driver);
+ if (unlikely(major))
+ goto FREE;
+ major = fepci_register_char_device();
+ if (unlikely(major < 0)) {
+ pci_unregister_driver(&fepci_driver);
+FREE:
+ free_page(stream_pointers);
+ return major;
+ }
+ return 0;
+}
+
+static void __exit fepci_cleanup(void)
+{
+ unsigned card;
+ pci_unregister_driver(&fepci_driver);
+ fepci_unregister_char_device();
+ free_page(stream_pointers);
+ for (card = 0u; card < find_cnt; card++)
+ kfree(card_privates[card]);
+ kfree(card_privates);
+}
+
+module_init(fepci_init);
+module_exit(fepci_cleanup);
--
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