diff options
Diffstat (limited to 'drivers/ipack/devices/ipoctal.c')
| -rw-r--r-- | drivers/ipack/devices/ipoctal.c | 227 |
1 files changed, 133 insertions, 94 deletions
diff --git a/drivers/ipack/devices/ipoctal.c b/drivers/ipack/devices/ipoctal.c index 141094e7c06e..ba2e9e52d72b 100644 --- a/drivers/ipack/devices/ipoctal.c +++ b/drivers/ipack/devices/ipoctal.c @@ -1,15 +1,10 @@ -/** - * ipoctal.c - * +// SPDX-License-Identifier: GPL-2.0-only +/* * driver for the GE IP-OCTAL boards * * Copyright (C) 2009-2012 CERN (www.cern.ch) * Author: Nicolas Serafini, EIC2 SA * Author: Samuel Iglesias Gonsalvez <siglesias@igalia.com> - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License as published by the Free - * Software Foundation; version 2 of the License. */ #include <linux/device.h> @@ -38,6 +33,7 @@ struct ipoctal_channel { unsigned int pointer_read; unsigned int pointer_write; struct tty_port tty_port; + bool tty_registered; union scc2698_channel __iomem *regs; union scc2698_block __iomem *block_regs; unsigned int board_id; @@ -55,6 +51,22 @@ struct ipoctal { u8 __iomem *int_space; }; +static inline struct ipoctal *chan_to_ipoctal(struct ipoctal_channel *chan, + unsigned int index) +{ + return container_of(chan, struct ipoctal, channel[index]); +} + +static void ipoctal_reset_channel(struct ipoctal_channel *channel) +{ + iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr); + channel->rx_enable = 0; + iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr); + iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr); + iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr); + iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr); +} + static int ipoctal_port_activate(struct tty_port *port, struct tty_struct *tty) { struct ipoctal_channel *channel; @@ -70,13 +82,33 @@ static int ipoctal_port_activate(struct tty_port *port, struct tty_struct *tty) return 0; } -static int ipoctal_open(struct tty_struct *tty, struct file *file) +static int ipoctal_install(struct tty_driver *driver, struct tty_struct *tty) { - struct ipoctal_channel *channel; + struct ipoctal_channel *channel = dev_get_drvdata(tty->dev); + struct ipoctal *ipoctal = chan_to_ipoctal(channel, tty->index); + int res; + + if (!ipack_get_carrier(ipoctal->dev)) + return -EBUSY; + + res = tty_standard_install(driver, tty); + if (res) + goto err_put_carrier; - channel = dev_get_drvdata(tty->dev); tty->driver_data = channel; + return 0; + +err_put_carrier: + ipack_put_carrier(ipoctal->dev); + + return res; +} + +static int ipoctal_open(struct tty_struct *tty, struct file *file) +{ + struct ipoctal_channel *channel = tty->driver_data; + return tty_port_open(&channel->tty_port, tty, file); } @@ -126,9 +158,7 @@ static int ipoctal_get_icount(struct tty_struct *tty, static void ipoctal_irq_rx(struct ipoctal_channel *channel, u8 sr) { struct tty_port *port = &channel->tty_port; - unsigned char value; - unsigned char flag; - u8 isr; + u8 isr, value, flag; do { value = ioread8(&channel->regs->r.rhr); @@ -151,7 +181,6 @@ static void ipoctal_irq_rx(struct ipoctal_channel *channel, u8 sr) flag = TTY_FRAME; } if (sr & SR_RECEIVED_BREAK) { - iowrite8(CR_CMD_RESET_BREAK_CHANGE, &channel->regs->w.cr); channel->stats.rcv_break++; flag = TTY_BREAK; } @@ -171,30 +200,34 @@ static void ipoctal_irq_rx(struct ipoctal_channel *channel, u8 sr) static void ipoctal_irq_tx(struct ipoctal_channel *channel) { - unsigned char value; unsigned int *pointer_write = &channel->pointer_write; + u8 value; if (channel->nb_bytes == 0) return; + spin_lock(&channel->lock); value = channel->tty_port.xmit_buf[*pointer_write]; iowrite8(value, &channel->regs->w.thr); channel->stats.tx++; (*pointer_write)++; *pointer_write = *pointer_write % PAGE_SIZE; channel->nb_bytes--; + spin_unlock(&channel->lock); } static void ipoctal_irq_channel(struct ipoctal_channel *channel) { u8 isr, sr; - spin_lock(&channel->lock); /* The HW is organized in pair of channels. See which register we need * to read from */ isr = ioread8(&channel->block_regs->r.isr); sr = ioread8(&channel->regs->r.sr); + if (isr & (IMR_DELTA_BREAK_A | IMR_DELTA_BREAK_B)) + iowrite8(CR_CMD_RESET_BREAK_CHANGE, &channel->regs->w.cr); + if ((sr & SR_TX_EMPTY) && (channel->nb_bytes == 0)) { iowrite8(CR_DISABLE_TX, &channel->regs->w.cr); /* In case of RS-485, change from TX to RX when finishing TX. @@ -213,14 +246,12 @@ static void ipoctal_irq_channel(struct ipoctal_channel *channel) /* TX of each character */ if ((isr & channel->isr_tx_rdy_mask) && (sr & SR_TX_READY)) ipoctal_irq_tx(channel); - - spin_unlock(&channel->lock); } static irqreturn_t ipoctal_irq_handler(void *arg) { unsigned int i; - struct ipoctal *ipoctal = (struct ipoctal *) arg; + struct ipoctal *ipoctal = arg; /* Clear the IPack device interrupt */ readw(ipoctal->int_space + ACK_INT_REQ0); @@ -243,8 +274,7 @@ static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr, { int res; int i; - struct tty_driver *tty; - char name[20]; + struct tty_driver *drv; struct ipoctal_channel *channel; struct ipack_region *region; void __iomem *addr; @@ -254,7 +284,7 @@ static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr, ipoctal->board_id = ipoctal->dev->id_device; region = &ipoctal->dev->region[IPACK_IO_SPACE]; - addr = devm_ioremap_nocache(&ipoctal->dev->dev, + addr = devm_ioremap(&ipoctal->dev->dev, region->start, region->size); if (!addr) { dev_err(&ipoctal->dev->dev, @@ -270,7 +300,7 @@ static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr, region = &ipoctal->dev->region[IPACK_INT_SPACE]; ipoctal->int_space = - devm_ioremap_nocache(&ipoctal->dev->dev, + devm_ioremap(&ipoctal->dev->dev, region->start, region->size); if (!ipoctal->int_space) { dev_err(&ipoctal->dev->dev, @@ -281,7 +311,7 @@ static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr, region = &ipoctal->dev->region[IPACK_MEM8_SPACE]; ipoctal->mem8_space = - devm_ioremap_nocache(&ipoctal->dev->dev, + devm_ioremap(&ipoctal->dev->dev, region->start, 0x8000); if (!ipoctal->mem8_space) { dev_err(&ipoctal->dev->dev, @@ -305,10 +335,7 @@ static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr, channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_A; } - iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr); - channel->rx_enable = 0; - iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr); - iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr); + ipoctal_reset_channel(channel); iowrite8(MR1_CHRL_8_BITS | MR1_ERROR_CHAR | MR1_RxINT_RxRDY, &channel->regs->w.mr); /* mr1 */ iowrite8(0, &channel->regs->w.mr); /* mr2 */ @@ -324,57 +351,53 @@ static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr, &block_regs[i].w.imr); } - /* - * IP-OCTAL has different addresses to copy its IRQ vector. - * Depending of the carrier these addresses are accesible or not. - * More info in the datasheet. - */ - ipoctal->dev->bus->ops->request_irq(ipoctal->dev, - ipoctal_irq_handler, ipoctal); /* Dummy write */ iowrite8(1, ipoctal->mem8_space + 1); /* Register the TTY device */ /* Each IP-OCTAL channel is a TTY port */ - tty = alloc_tty_driver(NR_CHANNELS); - - if (!tty) - return -ENOMEM; + drv = tty_alloc_driver(NR_CHANNELS, TTY_DRIVER_REAL_RAW | + TTY_DRIVER_DYNAMIC_DEV); + if (IS_ERR(drv)) + return PTR_ERR(drv); /* Fill struct tty_driver with ipoctal data */ - tty->owner = THIS_MODULE; - tty->driver_name = KBUILD_MODNAME; - sprintf(name, KBUILD_MODNAME ".%d.%d.", bus_nr, slot); - tty->name = name; - tty->major = 0; - - tty->minor_start = 0; - tty->type = TTY_DRIVER_TYPE_SERIAL; - tty->subtype = SERIAL_TYPE_NORMAL; - tty->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; - tty->init_termios = tty_std_termios; - tty->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; - tty->init_termios.c_ispeed = 9600; - tty->init_termios.c_ospeed = 9600; - - tty_set_operations(tty, &ipoctal_fops); - res = tty_register_driver(tty); + drv->owner = THIS_MODULE; + drv->driver_name = KBUILD_MODNAME; + drv->name = kasprintf(GFP_KERNEL, KBUILD_MODNAME ".%d.%d.", bus_nr, slot); + if (!drv->name) { + res = -ENOMEM; + goto err_put_driver; + } + drv->major = 0; + + drv->minor_start = 0; + drv->type = TTY_DRIVER_TYPE_SERIAL; + drv->subtype = SERIAL_TYPE_NORMAL; + drv->init_termios = tty_std_termios; + drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; + drv->init_termios.c_ispeed = 9600; + drv->init_termios.c_ospeed = 9600; + + tty_set_operations(drv, &ipoctal_fops); + res = tty_register_driver(drv); if (res) { dev_err(&ipoctal->dev->dev, "Can't register tty driver.\n"); - put_tty_driver(tty); - return res; + goto err_free_name; } /* Save struct tty_driver for use it when uninstalling the device */ - ipoctal->tty_drv = tty; + ipoctal->tty_drv = drv; for (i = 0; i < NR_CHANNELS; i++) { struct device *tty_dev; channel = &ipoctal->channel[i]; tty_port_init(&channel->tty_port); - tty_port_alloc_xmit_buf(&channel->tty_port); + res = tty_port_alloc_xmit_buf(&channel->tty_port); + if (res) + continue; channel->tty_port.ops = &ipoctal_tty_port_ops; ipoctal_reset_stats(&channel->stats); @@ -382,24 +405,40 @@ static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr, spin_lock_init(&channel->lock); channel->pointer_read = 0; channel->pointer_write = 0; - tty_dev = tty_port_register_device(&channel->tty_port, tty, i, NULL); + tty_dev = tty_port_register_device_attr(&channel->tty_port, drv, + i, NULL, channel, NULL); if (IS_ERR(tty_dev)) { dev_err(&ipoctal->dev->dev, "Failed to register tty device.\n"); + tty_port_free_xmit_buf(&channel->tty_port); tty_port_destroy(&channel->tty_port); continue; } - dev_set_drvdata(tty_dev, channel); + channel->tty_registered = true; } + /* + * IP-OCTAL has different addresses to copy its IRQ vector. + * Depending of the carrier these addresses are accesible or not. + * More info in the datasheet. + */ + ipoctal->dev->bus->ops->request_irq(ipoctal->dev, + ipoctal_irq_handler, ipoctal); + return 0; + +err_free_name: + kfree(drv->name); +err_put_driver: + tty_driver_kref_put(drv); + + return res; } -static inline int ipoctal_copy_write_buffer(struct ipoctal_channel *channel, - const unsigned char *buf, - int count) +static inline size_t ipoctal_copy_write_buffer(struct ipoctal_channel *channel, + const u8 *buf, size_t count) { unsigned long flags; - int i; + size_t i; unsigned int *pointer_read = &channel->pointer_read; /* Copy the bytes from the user buffer to the internal one */ @@ -417,11 +456,11 @@ static inline int ipoctal_copy_write_buffer(struct ipoctal_channel *channel, return i; } -static int ipoctal_write_tty(struct tty_struct *tty, - const unsigned char *buf, int count) +static ssize_t ipoctal_write_tty(struct tty_struct *tty, const u8 *buf, + size_t count) { struct ipoctal_channel *channel = tty->driver_data; - unsigned int char_copied; + size_t char_copied; char_copied = ipoctal_copy_write_buffer(channel, buf, count); @@ -440,14 +479,14 @@ static int ipoctal_write_tty(struct tty_struct *tty, return char_copied; } -static int ipoctal_write_room(struct tty_struct *tty) +static unsigned int ipoctal_write_room(struct tty_struct *tty) { struct ipoctal_channel *channel = tty->driver_data; return PAGE_SIZE - channel->nb_bytes; } -static int ipoctal_chars_in_buffer(struct tty_struct *tty) +static unsigned int ipoctal_chars_in_buffer(struct tty_struct *tty) { struct ipoctal_channel *channel = tty->driver_data; @@ -455,7 +494,7 @@ static int ipoctal_chars_in_buffer(struct tty_struct *tty) } static void ipoctal_set_termios(struct tty_struct *tty, - struct ktermios *old_termios) + const struct ktermios *old_termios) { unsigned int cflag; unsigned char mr1 = 0; @@ -467,11 +506,7 @@ static void ipoctal_set_termios(struct tty_struct *tty, cflag = tty->termios.c_cflag; /* Disable and reset everything before change the setup */ - iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr); - iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr); - iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr); - iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr); - iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr); + ipoctal_reset_channel(channel); /* Set Bits per chars */ switch (cflag & CSIZE) { @@ -528,7 +563,6 @@ static void ipoctal_set_termios(struct tty_struct *tty, break; default: return; - break; } baud = tty_get_baud_rate(tty); @@ -609,14 +643,8 @@ static void ipoctal_hangup(struct tty_struct *tty) tty_port_hangup(&channel->tty_port); - iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr); - channel->rx_enable = 0; - iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr); - iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr); - iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr); - iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr); - - clear_bit(ASYNCB_INITIALIZED, &channel->tty_port.flags); + ipoctal_reset_channel(channel); + tty_port_set_initialized(&channel->tty_port, false); wake_up_interruptible(&channel->tty_port.open_wait); } @@ -627,17 +655,22 @@ static void ipoctal_shutdown(struct tty_struct *tty) if (channel == NULL) return; - iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr); - channel->rx_enable = 0; - iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr); - iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr); - iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr); - iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr); - clear_bit(ASYNCB_INITIALIZED, &channel->tty_port.flags); + ipoctal_reset_channel(channel); + tty_port_set_initialized(&channel->tty_port, false); +} + +static void ipoctal_cleanup(struct tty_struct *tty) +{ + struct ipoctal_channel *channel = tty->driver_data; + struct ipoctal *ipoctal = chan_to_ipoctal(channel, tty->index); + + /* release the carrier driver */ + ipack_put_carrier(ipoctal->dev); } static const struct tty_operations ipoctal_fops = { .ioctl = NULL, + .install = ipoctal_install, .open = ipoctal_open, .close = ipoctal_close, .write = ipoctal_write_tty, @@ -647,6 +680,7 @@ static const struct tty_operations ipoctal_fops = { .get_icount = ipoctal_get_icount, .hangup = ipoctal_hangup, .shutdown = ipoctal_shutdown, + .cleanup = ipoctal_cleanup, }; static int ipoctal_probe(struct ipack_device *dev) @@ -679,13 +713,18 @@ static void __ipoctal_remove(struct ipoctal *ipoctal) for (i = 0; i < NR_CHANNELS; i++) { struct ipoctal_channel *channel = &ipoctal->channel[i]; + + if (!channel->tty_registered) + continue; + tty_unregister_device(ipoctal->tty_drv, i); tty_port_free_xmit_buf(&channel->tty_port); tty_port_destroy(&channel->tty_port); } tty_unregister_driver(ipoctal->tty_drv); - put_tty_driver(ipoctal->tty_drv); + kfree(ipoctal->tty_drv->name); + tty_driver_kref_put(ipoctal->tty_drv); kfree(ipoctal); } |