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Message-ID: <5dafa790-4ec9-f651-e5be-efb68e98bbe6@metux.net>
Date: Fri, 12 Apr 2019 18:10:44 +0200
From: "Enrico Weigelt, metux IT consult" <lkml@...ux.net>
To: Morris Ku <saumah@...il.com>, lee.jones@...aro.org
Cc: linux-kernel@...r.kernel.org, morris_ku@...ix.com
Subject: Re: [PATCH 4/4 V2] Add support for SUNIX Multi-IO board
On 12.04.19 15:36, Morris Ku wrote:
> This patch is a reincarnation of the first version of the
> fix which has been discussed as not a correct approach.
> diff --git a/drivers/mfd/sunix/snx_ieee1284.c b/drivers/mfd/sunix/snx_ieee1284.c
> new file mode 100644
> index 000000000000..94adf24e53e1
> --- /dev/null
> +++ b/drivers/mfd/sunix/snx_ieee1284.c
> @@ -0,0 +1,144 @@
> +// SPDX-License-Identifier: GPL-2.0
> +#include "snx_common.h"
> +
> +static void sunix_parport_ieee1284_wakeup(struct parport *port)
> +{
> + up(&port->physport->ieee1284.irq);
> +}
> +
> +static void sunix_timeout_waiting_on_port(struct timer_list *t)
> +{
> + struct parport *port = from_timer(port, t, timer);
> +
> + sunix_parport_ieee1284_wakeup(port);
> +}
> +
> +int sunix_parport_wait_event(struct parport *port, signed long timeout)
> +{
> + int ret;
> +
> + if (!port->physport->cad->timeout)
> + return 1;
> +
> + timer_setup(&port->timer, sunix_timeout_waiting_on_port, 0);
> + mod_timer(&port->timer, jiffies + timeout);
> +
> + ret = down_interruptible(&port->physport->ieee1284.irq);
> +
> + if (!del_timer(&port->timer) && !ret)
> + ret = 1;
> +
> + return ret;
> +}
> +
> +
> +int sunix_parport_poll_peripheral(struct parport *port, unsigned char mask,
> +unsigned char result, int usec)
> +{
> + int count = usec / 5 + 2;
> + int i;
> + unsigned char status;
> +
> + for (i = 0; i < count; i++) {
> + status = sunix_parport_read_status(port);
> +
> + if ((status & mask) == result)
> + return 0;
> +
> + if (signal_pending(current))
> + return -EINTR;
> +
> + if (need_resched())
> + break;
> +
> + if (i >= 2)
> + udelay(5);
> +
> + }
> +
> + return 1;
> +}
> +
> +
> +int sunix_parport_wait_peripheral(struct parport *port,
> +unsigned char mask, unsigned char result)
> +{
> + int ret;
> + int usec;
> + unsigned long deadline;
> + unsigned char status;
> +
> + usec = port->physport->spintime;
> +
> + if (!port->physport->cad->timeout)
> + usec = 35000;
> +
> + ret = sunix_parport_poll_peripheral(port, mask, result, usec);
> +
> + if (ret != 1)
> + return ret;
> +
> + if (!port->physport->cad->timeout)
> + return 1;
> +
> + deadline = jiffies + (HZ + 24) / 25;
> +
> + while (time_before(jiffies, deadline)) {
> + int ret;
> +
> + if (signal_pending(current))
> + return -EINTR;
> +
> + ret = sunix_parport_wait_event(port, (HZ + 99) / 100);
> + if (ret < 0)
> + return ret;
> +
> + status = sunix_parport_read_status(port);
> + if ((status & mask) == result)
> + return 0;
> +
> + if (!ret)
> + schedule_timeout_interruptible(msecs_to_jiffies(10));
> + }
> +
> + return 1;
> +}
> +
> +
> +int sunix_parport_negotiate(struct parport *port, int mode)
> +{
> + if (mode == IEEE1284_MODE_COMPAT)
> + return 0;
> +
> + return -1;
> +}
> +
> +
> +ssize_t sunix_parport_write(struct parport *port,
> +const void *buffer, size_t len)
> +{
> + ssize_t ret;
> +
> + ret = port->ops->compat_write_data(port, buffer, len, 0);
> +
> + return ret;
> +}
> +
> +
> +ssize_t sunix_parport_read(struct parport *port, void *buffer, size_t len)
> +{
> + return -ENODEV;
> +}
> +
> +
> +long sunix_parport_set_timeout(struct pardevice *dev, long inactivity)
> +{
> + long int old = dev->timeout;
> +
> + dev->timeout = inactivity;
> +
> + if (dev->port->physport->cad == dev)
> + sunix_parport_ieee1284_wakeup(dev->port);
> +
> + return old;
> +}
> diff --git a/drivers/mfd/sunix/snx_ieee1284_ops.c b/drivers/mfd/sunix/snx_ieee1284_ops.c
> new file mode 100644
> index 000000000000..5e0a80d36953
> --- /dev/null
> +++ b/drivers/mfd/sunix/snx_ieee1284_ops.c
> @@ -0,0 +1,228 @@
> +// SPDX-License-Identifier: GPL-2.0
> +#include "snx_common.h"
> +
> +
> +size_t sunix_parport_ieee1284_write_compat(struct parport *port,
> +const void *buffer, size_t len, int flags)
> +{
> + int no_irq = 1;
> + ssize_t count = 0;
> + const unsigned char *addr = buffer;
> + unsigned char byte;
> + struct pardevice *dev = port->physport->cad;
> + unsigned char ctl = (PARPORT_CONTROL_SELECT | PARPORT_CONTROL_INIT);
> +
> + if (port->irq != PARPORT_IRQ_NONE) {
> + sunix_parport_enable_irq(port);
> + no_irq = 0;
> + }
> +
> + port->physport->ieee1284.phase = IEEE1284_PH_FWD_DATA;
> + sunix_parport_write_control(port, ctl);
> + sunix_parport_data_forward(port);
> +
> + while (count < len) {
> + unsigned long expire = jiffies + dev->timeout;
> + long wait = (HZ + 99) / 100;
> + unsigned char mask = (PARPORT_STATUS_ERROR |
> + PARPORT_STATUS_BUSY);
> + unsigned char val = (PARPORT_STATUS_ERROR |
> + PARPORT_STATUS_BUSY);
> +
> + do {
> + if (!sunix_parport_wait_peripheral(port, mask, val))
> + goto ready;
> +
> + if ((sunix_parport_read_status(port) &
> + (PARPORT_STATUS_PAPEROUT | PARPORT_STATUS_SELECT |
> + PARPORT_STATUS_ERROR)) != (PARPORT_STATUS_SELECT |
> + PARPORT_STATUS_ERROR))
> + goto stop;
> +
> + if (!time_before(jiffies, expire))
> + break;
> +
> + if (count && no_irq) {
> + sunix_parport_release(dev);
> +
> + schedule_timeout_interruptible(wait);
> +
> + sunix_parport_claim_or_block(dev);
> + } else {
> + sunix_parport_wait_event(port, wait);
> + }
> +
> + if (signal_pending(current))
> + break;
> +
> + wait *= 2;
> + } while (time_before(jiffies, expire));
> +
> + if (signal_pending(current))
> + break;
> +
> + break;
> +
> +ready:
> + byte = *addr++;
> + sunix_parport_write_data(port, byte);
> + udelay(1);
> +
> + sunix_parport_write_control(port, ctl | PARPORT_CONTROL_STROBE);
> + udelay(1);
> +
> + sunix_parport_write_control(port, ctl);
> + udelay(1);
> +
> + count++;
> +
> + if (time_before(jiffies, expire)) {
> + if (!sunix_parport_yield_blocking(dev) &&
> + need_resched())
> + schedule();
> + }
> + }
> +stop:
> + port->physport->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
> +
> + return count;
> +}
> +
> +size_t sunix_parport_ieee1284_epp_write_data(struct parport *port,
> +const void *buffer, size_t len, int flags)
> +{
> + unsigned char *bp = (unsigned char *) buffer;
> + size_t ret = 0;
> +
> + sunix_parport_frob_control(port, PARPORT_CONTROL_STROBE |
> + PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_SELECT |
> + PARPORT_CONTROL_INIT, PARPORT_CONTROL_STROBE | PARPORT_CONTROL_INIT);
> +
> + port->ops->data_forward(port);
> +
> + for (; len > 0; len--, bp++) {
> + sunix_parport_write_data(port, *bp);
> + sunix_parport_frob_control(port, PARPORT_CONTROL_AUTOFD,
> + PARPORT_CONTROL_AUTOFD);
> +
> + if (sunix_parport_poll_peripheral(port, PARPORT_STATUS_BUSY,
> + 0, 10))
> + break;
> +
> + sunix_parport_frob_control(port, PARPORT_CONTROL_AUTOFD, 0);
> +
> + if (sunix_parport_poll_peripheral(port, PARPORT_STATUS_BUSY,
> + PARPORT_STATUS_BUSY, 5))
> + break;
> +
> + ret++;
> + }
> +
> + sunix_parport_frob_control(port, PARPORT_CONTROL_STROBE, 0);
> + return ret;
> +}
> +
> +
> +size_t sunix_parport_ieee1284_epp_read_data(struct parport *port,
> +void *buffer, size_t len, int flags)
> +{
> + unsigned char *bp = (unsigned char *) buffer;
> + unsigned int ret = 0;
> +
> + sunix_parport_frob_control(port, PARPORT_CONTROL_STROBE |
> + PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_SELECT |
> + PARPORT_CONTROL_INIT, PARPORT_CONTROL_INIT);
> +
> + port->ops->data_reverse(port);
> +
> + for (; len > 0; len--, bp++) {
> + sunix_parport_frob_control(port, PARPORT_CONTROL_AUTOFD,
> + PARPORT_CONTROL_AUTOFD);
> +
> + if (sunix_parport_wait_peripheral(port, PARPORT_STATUS_BUSY, 0))
> + break;
> +
> + *bp = sunix_parport_read_data(port);
> +
> + sunix_parport_frob_control(port, PARPORT_CONTROL_AUTOFD, 0);
> +
> + if (sunix_parport_poll_peripheral(port, PARPORT_STATUS_BUSY,
> + PARPORT_STATUS_BUSY, 5))
> + break;
> +
> + ret++;
> + }
> + port->ops->data_forward(port);
> + return ret;
> +}
> +
> +
> +size_t sunix_parport_ieee1284_epp_write_addr(struct parport *port,
> +const void *buffer, size_t len, int flags)
> +{
> + unsigned char *bp = (unsigned char *)buffer;
> + size_t ret = 0;
> +
> + sunix_parport_frob_control(port, PARPORT_CONTROL_STROBE |
> + PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_SELECT |
> + PARPORT_CONTROL_INIT, PARPORT_CONTROL_STROBE | PARPORT_CONTROL_INIT);
> +
> + port->ops->data_forward(port);
> +
> + for (; len > 0; len--, bp++) {
> + sunix_parport_write_data(port, *bp);
> + sunix_parport_frob_control(port, PARPORT_CONTROL_SELECT,
> + PARPORT_CONTROL_SELECT);
> +
> + if (sunix_parport_poll_peripheral(port, PARPORT_STATUS_BUSY,
> + 0, 10))
> + break;
> +
> + sunix_parport_frob_control(port, PARPORT_CONTROL_SELECT, 0);
> +
> + if (sunix_parport_poll_peripheral(port, PARPORT_STATUS_BUSY,
> + PARPORT_STATUS_BUSY, 5))
> + break;
> +
> + ret++;
> + }
> +
> + sunix_parport_frob_control(port, PARPORT_CONTROL_STROBE, 0);
> + return ret;
> +}
> +
> +size_t sunix_parport_ieee1284_epp_read_addr(struct parport *port,
> +void *buffer, size_t len, int flags)
> +{
> + unsigned char *bp = (unsigned char *) buffer;
> + unsigned int ret = 0;
> +
> + sunix_parport_frob_control(port, PARPORT_CONTROL_STROBE |
> + PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_SELECT |
> + PARPORT_CONTROL_INIT, PARPORT_CONTROL_INIT);
> +
> + port->ops->data_reverse(port);
> +
> + for (; len > 0; len--, bp++) {
> + sunix_parport_frob_control(port, PARPORT_CONTROL_SELECT,
> + PARPORT_CONTROL_SELECT);
> +
> + if (sunix_parport_wait_peripheral(port, PARPORT_STATUS_BUSY, 0))
> + break;
> +
> + *bp = sunix_parport_read_data(port);
> +
> + sunix_parport_frob_control(port, PARPORT_CONTROL_SELECT,
> + PARPORT_CONTROL_SELECT);
> +
> + if (sunix_parport_poll_peripheral(port, PARPORT_STATUS_BUSY,
> + PARPORT_STATUS_BUSY, 5))
> + break;
> +
> + ret++;
> + }
> +
> + port->ops->data_forward(port);
> + return ret;
> +}
> +
> diff --git a/drivers/mfd/sunix/snx_lp.c b/drivers/mfd/sunix/snx_lp.c
> new file mode 100644
> index 000000000000..da6d45db134a
> --- /dev/null
> +++ b/drivers/mfd/sunix/snx_lp.c
> @@ -0,0 +1,603 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#include "snx_common.h"
> +#include "snx_lp.h"
> +
> +static int SNX_PAL_MAJOR;
> +
> +#define SNX_LP_NO SNX_PAR_TOTAL_MAX
> +
> +static struct snx_lp_struct snx_lp_table[SNX_LP_NO];
> +static unsigned int snx_lp_count;
> +static struct class *snx_lp_class;
> +
> +#define SNX_LP_PREEMPT_REQUEST 1
> +#define SNX_LP_PARPORT_CLAIMED 2
> +
> +#ifdef CONFIG_LP_CONSOLE
> +static struct parport *console_registered;
> +#endif
Don't reimplement existing standard functions. LP already works ontop of
parport driver subsystem. You should write a parport driver instead.
> +
> +#define r_dtr(x) (sunix_parport_read_data(snx_lp_table[(x)].dev->port))
> +#define r_str(x) (sunix_parport_read_status(snx_lp_table[(x)].dev->port))
> +#define w_ctr(x, y) do { sunix_parport_write_control(snx_lp_table[(x)].dev->port, (y)); } while (0)
> +#define w_dtr(x, y) do { sunix_parport_write_data(snx_lp_table[(x)].dev->port, (y)); } while (0)
> +
> +static void snx_lp_claim_parport_or_block(struct snx_lp_struct *this_lp)
> +{
> + if (!test_and_set_bit(SNX_LP_PARPORT_CLAIMED, &this_lp->bits))
> + sunix_parport_claim_or_block(this_lp->dev);
> +}
> +static void snx_lp_release_parport(struct snx_lp_struct *this_lp)
> +{
> + if (test_and_clear_bit(SNX_LP_PARPORT_CLAIMED, &this_lp->bits))
> + sunix_parport_release(this_lp->dev);
> +}
Don't reimplement existing standard functions. LP already works ontop of
parport driver subsystem. You should write a parport driver instead.
> +static int snx_lp_preempt(void *handle)
> +{
> + struct snx_lp_struct *this_lp = (struct snx_lp_struct *)handle;
> +
> + set_bit(SNX_LP_PREEMPT_REQUEST, &this_lp->bits);
> + return 1;
> +}
Don't reimplement existing standard functions. LP already works ontop of
parport driver subsystem. You should write a parport driver instead.
> +static int snx_lp_negotiate(struct parport *port, int mode)
> +{
> + if (sunix_parport_negotiate(port, mode) != 0) {
> + mode = IEEE1284_MODE_COMPAT;
> + sunix_parport_negotiate(port, mode);
> + }
> + return (mode);
> +}
Don't reimplement existing standard functions. LP already works ontop of
parport driver subsystem. You should write a parport driver instead.
> +static int snx_lp_reset(int minor)
> +{
> + int retval;
> +
> + snx_lp_claim_parport_or_block(&snx_lp_table[minor]);
> +
> + w_ctr(minor, SNX_LP_PSELECP);
> +
> + udelay(SNX_LP_DELAY);
> +
> + w_ctr(minor, SNX_LP_PSELECP | SNX_LP_PINITP);
> +
> + retval = r_str(minor);
> +
> + snx_lp_release_parport(&snx_lp_table[minor]);
> + return retval;
> +}
Don't reimplement existing standard functions. LP already works ontop of
parport driver subsystem. You should write a parport driver instead.
> +static void snx_lp_error(int minor)
> +{
> + DEFINE_WAIT(wait);
> +
> + int polling;
> +
> + if (SNX_LP_F(minor) & SNX_LP_ABORT)
> + return;
> +
> + polling = snx_lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE;
> +
> + if (polling)
> + snx_lp_release_parport(&snx_lp_table[minor]);
> +
> + prepare_to_wait(&snx_lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
> +
> + schedule_timeout(SNX_LP_TIMEOUT_POLLED);
> + finish_wait(&snx_lp_table[minor].waitq, &wait);
> +
> + if (polling)
> + snx_lp_claim_parport_or_block(&snx_lp_table[minor]);
> + else
> + sunix_parport_yield_blocking(snx_lp_table[minor].dev);
> +
> +}
Don't reimplement existing standard functions. LP already works ontop of
parport driver subsystem. You should write a parport driver instead.
> +static int snx_lp_check_status(int minor)
> +{
> + int error = 0;
> + unsigned int last = snx_lp_table[minor].last_error;
> + unsigned char status = r_str(minor);
> +
> + if ((status & SNX_LP_PERRORP) && !(SNX_LP_F(minor) & SNX_LP_CAREFUL)) {
> + last = 0;
> + } else if ((status & SNX_LP_POUTPA)) {
> + if (last != SNX_LP_POUTPA) {
> + last = SNX_LP_POUTPA;
> + pr_info("SNX Info : lp%d port out of paper.\n", minor);
> + }
> + error = -ENOSPC;
> + } else if (!(status & SNX_LP_PSELECD)) {
> + if (last != SNX_LP_PSELECD) {
> + last = SNX_LP_PSELECD;
> + pr_info("SNX Info : lp%d port off-line.\n", minor);
> + }
> + error = -EIO;
> + } else if (!(status & SNX_LP_PERRORP)) {
> + if (last != SNX_LP_PERRORP) {
> + last = SNX_LP_PERRORP;
> + pr_info("SNX Info : lp%d port on fire.\n", minor);
> + }
> + error = -EIO;
> + } else {
> + last = 0;
> + }
> +
> + snx_lp_table[minor].last_error = last;
> +
> + if (last != 0)
> + snx_lp_error(minor);
> +
> + return error;
> +}
> +
> +
> +static int snx_lp_wait_ready(int minor, int nonblock)
> +{
> + int error = 0;
> +
> + if (snx_lp_table[minor].current_mode != IEEE1284_MODE_COMPAT)
> + return 0;
> +
> +
> + do {
> + error = snx_lp_check_status(minor);
> +
> + if (error && (nonblock || (SNX_LP_F(minor) & SNX_LP_ABORT)))
> + break;
> +
> +
> + if (signal_pending(current)) {
> + error = -EINTR;
> + break;
> + }
> + } while (error);
> +
> + return error;
> +}
Don't reimplement existing standard functions. LP already works ontop of
parport driver subsystem. You should write a parport driver instead.
> +static ssize_t snx_lp_write(struct file *file,
> +const char __user *buf, size_t count, loff_t *ppos)
> +{
> + unsigned int minor = iminor(file->f_path.dentry->d_inode);
> +
> + struct parport *port = snx_lp_table[minor].dev->port;
> + char *kbuf = snx_lp_table[minor].lp_buffer;
> +
> + ssize_t retv = 0;
> + ssize_t written;
> + size_t copy_size = count;
> + int nonblock = ((file->f_flags & O_NONBLOCK) ||
> + (SNX_LP_F(minor) & SNX_LP_ABORT));
> +
> + if (copy_size > SNX_LP_BUFFER_SIZE)
> + copy_size = SNX_LP_BUFFER_SIZE;
> +
> + if (mutex_lock_interruptible(&snx_lp_table[minor].port_mutex))
> + return -EINTR;
> +
> + if (copy_from_user(kbuf, buf, copy_size)) {
> + retv = -EFAULT;
> + goto out_unlock;
> + }
> +
> + snx_lp_claim_parport_or_block(&snx_lp_table[minor]);
> +
> + snx_lp_table[minor].current_mode = snx_lp_negotiate(
> + port, snx_lp_table[minor].best_mode);
> +
> + sunix_parport_set_timeout(snx_lp_table[minor].dev, (nonblock ?
> + SNX_PARPORT_INACTIVITY_O_NONBLOCK : snx_lp_table[minor].timeout));
> +
> + retv = snx_lp_wait_ready(minor, nonblock);
> +
> + do {
> + written = sunix_parport_write(port, kbuf, copy_size);
> + if (written > 0) {
> + copy_size -= written;
> + count -= written;
> + buf += written;
> + retv += written;
> + }
> +
> + if (signal_pending(current)) {
> + if (retv == 0)
> + retv = -EINTR;
> +
> + break;
> + }
> +
> + if (copy_size > 0) {
> + int error;
> +
> + sunix_parport_negotiate(snx_lp_table[minor].dev->port,
> + IEEE1284_MODE_COMPAT);
> + snx_lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
> +
> + error = snx_lp_wait_ready(minor, nonblock);
> +
> + if (error) {
> + if (retv == 0)
> + retv = error;
> +
> + break;
> + } else if (nonblock) {
> + if (retv == 0)
> + retv = -EAGAIN;
> +
> + break;
> + }
> +
> + sunix_parport_yield_blocking(snx_lp_table[minor].dev);
> + snx_lp_table[minor].current_mode = snx_lp_negotiate(
> + port, snx_lp_table[minor].best_mode);
> +
> + } else if (need_resched()) {
> + schedule();
> + }
> +
> + if (count) {
> + copy_size = count;
> + if (copy_size > SNX_LP_BUFFER_SIZE)
> + copy_size = SNX_LP_BUFFER_SIZE;
> +
> +
> + if (copy_from_user(kbuf, buf, copy_size)) {
> + if (retv == 0)
> + retv = -EFAULT;
> +
> + break;
> + }
> + }
> + } while (count > 0);
> +
> + if (test_and_clear_bit(SNX_LP_PREEMPT_REQUEST,
> + &snx_lp_table[minor].bits)) {
> + pr_info("SNX Info : lp%d releasing parport.\n", minor);
> + sunix_parport_negotiate(snx_lp_table[minor].dev->port,
> + IEEE1284_MODE_COMPAT);
> +
> + snx_lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
> +
> + snx_lp_release_parport(&snx_lp_table[minor]);
> + }
> +
> +out_unlock:
> +
> + mutex_unlock(&snx_lp_table[minor].port_mutex);
> +
> + return retv;
> +}
Don't reimplement existing standard functions. LP already works ontop of
parport driver subsystem. You should write a parport driver instead.
> +static int snx_lp_open(struct inode *inode, struct file *file)
> +{
> + unsigned int minor = iminor(inode);
> +
> + if (minor >= SNX_LP_NO)
> + return -ENXIO;
> +
> +
> + if ((SNX_LP_F(minor) & SNX_LP_EXIST) == 0)
> + return -ENXIO;
> +
> +
> + if (test_and_set_bit(SNX_LP_BUSY_BIT_POS, &SNX_LP_F(minor)))
> + return -EBUSY;
> +
> +
> + if ((SNX_LP_F(minor) & SNX_LP_ABORTOPEN) &&
> + !(file->f_flags & O_NONBLOCK)) {
> + int status;
> +
> + snx_lp_claim_parport_or_block(&snx_lp_table[minor]);
> + status = r_str(minor);
> + snx_lp_release_parport(&snx_lp_table[minor]);
> +
> + if (status & SNX_LP_POUTPA) {
> + pr_info("SNX Error: lp%d out of paper.\n", minor);
> + SNX_LP_F(minor) &= ~SNX_LP_BUSY;
> + return -ENOSPC;
> + } else if (!(status & SNX_LP_PSELECD)) {
> + pr_info("SNX Error: lp%d off-line.\n", minor);
> + SNX_LP_F(minor) &= ~SNX_LP_BUSY;
> + return -EIO;
> + } else if (!(status & SNX_LP_PERRORP)) {
> + pr_info("SNX Error: lp%d printer error.\n", minor);
> + SNX_LP_F(minor) &= ~SNX_LP_BUSY;
> + return -EIO;
> + }
> + }
> +
> + snx_lp_table[minor].lp_buffer = kzalloc(SNX_LP_BUFFER_SIZE, GFP_KERNEL);
> +
> + if (!snx_lp_table[minor].lp_buffer) {
> + SNX_LP_F(minor) &= ~SNX_LP_BUSY;
> + return -ENOMEM;
> + }
> +
> + snx_lp_claim_parport_or_block(&snx_lp_table[minor]);
> +
> + if ((snx_lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) &&
> + !sunix_parport_negotiate(snx_lp_table[minor].dev->port,
> + IEEE1284_MODE_ECP)) {
> + pr_info("SNX Info : lp%d ECP mode.\n", minor);
> + snx_lp_table[minor].best_mode = IEEE1284_MODE_ECP;
> + } else {
> + snx_lp_table[minor].best_mode = IEEE1284_MODE_COMPAT;
> + }
> +
> + sunix_parport_negotiate(snx_lp_table[minor].dev->port,
> + IEEE1284_MODE_COMPAT);
> +
> + snx_lp_release_parport(&snx_lp_table[minor]);
> + snx_lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
> +
> + return 0;
> +}
Don't reimplement existing standard functions. LP already works ontop of
parport driver subsystem. You should write a parport driver instead.
> +static int snx_lp_release(struct inode *inode, struct file *file)
> +{
> + unsigned int minor = iminor(inode);
> +
> + snx_lp_claim_parport_or_block(&snx_lp_table[minor]);
> + sunix_parport_negotiate(snx_lp_table[minor].dev->port,
> + IEEE1284_MODE_COMPAT);
> +
> + snx_lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
> + snx_lp_release_parport(&snx_lp_table[minor]);
> + kfree(snx_lp_table[minor].lp_buffer);
> + snx_lp_table[minor].lp_buffer = NULL;
> + SNX_LP_F(minor) &= ~SNX_LP_BUSY;
> +
> + return 0;
> +}
Don't reimplement existing standard functions. LP already works ontop of
parport driver subsystem. You should write a parport driver instead.
> +static const struct file_operations lp_fops = {
> + .owner = THIS_MODULE,
> + .write = snx_lp_write,
> + .open = snx_lp_open,
> + .release = snx_lp_release,
> +};
> +
> +#ifdef CONFIG_LP_CONSOLE
> +#define SNX_CONSOLE_LP 0
> +
> +#define SNX_CONSOLE_LP_STRICT 1
> +
> +static void snx_lp_console_write(struct console *co,
> +const char *s, unsigned int count)
> +{
> + struct snx_pardevice *dev = snx_lp_table[SNX_CONSOLE_LP].dev;
> + struct snx_parport *port = dev->port;
> + ssize_t written;
> +
> + if (sunix_parport_claim(dev))
> + return;
> +
> + sunix_parport_set_timeout(dev, 0);
> +
> + sunix_parport_negotiate(port, IEEE1284_MODE_COMPAT);
> +
> + do {
> + ssize_t canwrite = count;
> + char *lf = memchr(s, '\n', count);
> +
> + if (lf)
> + canwrite = lf - s;
> +
> + if (canwrite > 0) {
> + written = sunix_parport_write(port, s, canwrite);
> +
> + if (written <= 0)
> + continue;
> +
> + s += written;
> + count -= written;
> + canwrite -= written;
> + }
> +
> + if (lf && canwrite <= 0) {
> + const char *crlf = "\r\n";
> + int i = 2;
> +
> + s++;
> + count--;
> + do {
> + written = sunix_parport_write(port, crlf, i);
> + if (written > 0)
> + i -= written, crlf += written;
> +
> + } while (i > 0 && (SNX_CONSOLE_LP_STRICT ||
> + written > 0));
> + }
> + } while (count > 0 && (SNX_CONSOLE_LP_STRICT || written > 0));
> +
> + sunix_parport_release(dev);
> +}
> +
> +static struct console snx_lpcons = {
> + .name = "lx",
> + .write = snx_lp_consle_write,
> + .flags = CON_PRINTBUFFER,
> +};
> +
> +#endif
Don't reimplement existing standard functions. LP already works ontop of
parport driver subsystem. You should write a parport driver instead.
> +static int snx_parport_nr[SNX_LP_NO] = {0, 1, 2, 3};
> +static int reset;
> +
> +
> +static int snx_lp_register(int nr, struct parport *port)
> +{
> + snx_lp_table[nr].dev = sunix_parport_register_device(port, "lx",
> + snx_lp_preempt, NULL, NULL, 0, (void *) &snx_lp_table[nr]);
> +
> + if (snx_lp_table[nr].dev == NULL)
> + return 1;
> +
> +
> + snx_lp_table[nr].flags |= SNX_LP_EXIST;
> +
> + if (reset)
> + snx_lp_reset(nr);
> +
> +
> + device_create(snx_lp_class, NULL, MKDEV(SNX_PAL_MAJOR, nr),
> + NULL, "lp%d", nr);
> +
> + pr_info("SNX Info : lp%d port using %s (%s).\n", nr, port->name,
> + (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
> +
> +
> +#ifdef CONFIG_LP_CONSOLE
> +
> + if (!nr) {
> + if (port->modes & PARPORT_MODE_SAFEININT) {
> + register_console(&snx_lpcons);
> + console_registered = port;
> + pr_info("SNX Info : lp%d port console ready.\n",
> + CONSOLE_LP);
> + } else {
> + pr_info("SNX Info : lp%d port cannot run console on %s.\n",
> + CONSOLE_LP, port->name);
> + }
> + }
> +#endif
> +
> + return 0;
> +}
Don't reimplement existing standard functions. LP already works ontop of
parport driver subsystem. You should write a parport driver instead.
> +static void snx_lp_attach(struct parport *port)
> +{
> + unsigned int i;
> +
> + for (i = 0; i < SNX_LP_NO; i++) {
> + if (port->number == snx_parport_nr[i]) {
> + if (!snx_lp_register(i, port))
> + snx_lp_count++;
> +
> + break;
> + }
> + }
> +}
> +
> +static void snx_lp_detach(struct parport *port)
> +{
> +
> +#ifdef CONFIG_LP_CONSOLE
> + if (console_registered == port) {
> + unregister_console(&snx_lpcons);
> + console_registered = NULL;
> + }
> +#endif
> +
> +}
Don't reimplement existing standard functions. LP already works ontop of
parport driver subsystem. You should write a parport driver instead.
> +static struct parport_driver lp_driver = {
> + .name = "lx",
> + .attach = snx_lp_attach,
> + .detach = snx_lp_detach,
> +};
> +
> +
> +static int snx_lp_init(void)
> +{
> + int i, err = 0;
> +
> + for (i = 0; i < SNX_LP_NO; i++) {
> + snx_lp_table[i].dev = NULL;
> + snx_lp_table[i].flags = 0;
> + snx_lp_table[i].chars = SNX_LP_INIT_CHAR;
> + snx_lp_table[i].time = SNX_LP_INIT_TIME;
> + snx_lp_table[i].wait = SNX_LP_INIT_WAIT;
> + snx_lp_table[i].lp_buffer = NULL;
> + snx_lp_table[i].last_error = 0;
> + init_waitqueue_head(&snx_lp_table[i].waitq);
> + init_waitqueue_head(&snx_lp_table[i].dataq);
> +
> + mutex_init(&snx_lp_table[i].port_mutex);
> +
> + snx_lp_table[i].timeout = 10 * HZ;
> + }
> +
> + SNX_PAL_MAJOR = register_chrdev(0, "lx", &lp_fops);
> +
> + if (SNX_PAL_MAJOR < 0) {
> + pr_info("SNX Error: lp unable to get major\n");
> + return -EIO;
> + }
> +
> + snx_lp_class = class_create(THIS_MODULE, "sprinter");
> +
> + if (IS_ERR(snx_lp_class)) {
> + err = PTR_ERR(snx_lp_class);
> + goto out_reg;
> + }
> +
> + if (sunix_parport_register_driver(&lp_driver)) {
> + pr_info("SNX Error: lp unable to register with parport.\n");
> + err = -EIO;
> + goto out_class;
> + }
> +
> + if (!snx_lp_count)
> + pr_info("SNX Warng: lp driver loaded but no devices found.\n");
> +
> +
> + return 0;
> +
> +out_class:
> +
> + class_destroy(snx_lp_class);
> +
> +out_reg:
> +
> + unregister_chrdev(SNX_PAL_MAJOR, "lx");
> + return err;
> +}
Don't reimplement existing standard functions. LP already works ontop of
parport driver subsystem. You should write a parport driver instead.
> +int sunix_par_lp_init(void)
> +{
> + int status = 0;
> +
> + status = snx_lp_init();
> + return status;
> +}
Don't reimplement existing standard functions. LP already works ontop of
parport driver subsystem. You should write a parport driver instead.
> +void sunix_par_lp_exit(void)
> +{
> + unsigned int offset;
> +
> + sunix_parport_unregister_driver(&lp_driver);
> +
> +#ifdef CONFIG_LP_CONSOLE
> + unregister_console(&snx_lpcons);
> +#endif
> +
> + unregister_chrdev(SNX_PAL_MAJOR, "lx");
> +
> + for (offset = 0; offset < SNX_LP_NO; offset++) {
> + if (snx_lp_table[offset].dev == NULL)
> + continue;
> +
> + sunix_parport_unregister_device(snx_lp_table[offset].dev);
> +
> + device_destroy(snx_lp_class, MKDEV(SNX_PAL_MAJOR, offset));
> +
> + }
> +
> + class_destroy(snx_lp_class);
> +}
Don't reimplement existing standard functions. LP already works ontop of
parport driver subsystem. You should write a parport driver instead.
> diff --git a/drivers/mfd/sunix/snx_lp.h b/drivers/mfd/sunix/snx_lp.h
> new file mode 100644
> index 000000000000..a0929642834c
> --- /dev/null
> +++ b/drivers/mfd/sunix/snx_lp.h
> @@ -0,0 +1,94 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _LINUX_SNX_LP_H
> +#define _LINUX_SNX_LP_H
> +
> +#include <linux/mutex.h>
> +
> +#define SNX_LP_EXIST 0x0001
> +#define SNX_LP_SELEC 0x0002
> +#define SNX_LP_BUSY 0x0004
> +#define SNX_LP_BUSY_BIT_POS 2
> +#define SNX_LP_OFFL 0x0008
> +#define SNX_LP_NOPA 0x0010
> +#define SNX_LP_ERR 0x0020
> +#define SNX_LP_ABORT 0x0040
> +#define SNX_LP_CAREFUL 0x0080
> +#define SNX_LP_ABORTOPEN 0x0100
> +
> +#define SNX_LP_TRUST_IRQ_ 0x0200
> +#define SNX_LP_NO_REVERSE 0x0400
> +#define SNX_LP_DATA_AVAIL 0x0800
> +
> +#define SNX_LP_PBUSY 0x80
> +#define SNX_LP_PACK 0x40
> +#define SNX_LP_POUTPA 0x20
> +#define SNX_LP_PSELECD 0x10
> +#define SNX_LP_PERRORP 0x08
> +
> +#define SNX_LP_INIT_CHAR 1000
> +#define SNX_LP_INIT_WAIT 1
> +#define SNX_LP_INIT_TIME 2
> +
> +#define SNX_LPCHAR 0x0601
> +#define SNX_LPTIME 0x0602
> +#define SNX_LPABORT 0x0604
> +#define SNX_LPSETIRQ 0x0605
> +#define SNX_LPGETIRQ 0x0606
> +#define SNX_LPWAIT 0x0608
> +
> +#define SNX_LPCAREFUL 0x0609
> +#define SNX_LPABORTOPEN 0x060a
> +#define SNX_LPGETSTATUS 0x060b
> +#define SNX_LPRESET 0x060c
> +
> +#define SNX_LPGETFLAGS 0x060e
> +#define SNX_LPSETTIMEOUT 0x060f
> +
> +#define SNX_LP_TIMEOUT_INTERRUPT (60 * HZ)
> +#define SNX_LP_TIMEOUT_POLLED (10 * HZ)
> +
> +#define SNX_LP_PARPORT_UNSPEC -4
> +#define SNX_LP_PARPORT_AUTO -3
> +#define SNX_LP_PARPORT_OFF -2
> +#define SNX_LP_PARPORT_NONE -1
> +
> +#define SNX_LP_F(minor) snx_lp_table[(minor)].flags
> +#define SNX_LP_CHAR(minor) snx_lp_table[(minor)].chars
> +#define SNX_LP_TIME(minor) snx_lp_table[(minor)].time
> +#define SNX_LP_WAIT(minor) snx_lp_table[(minor)].wait
> +#define SNX_LP_IRQ(minor) snx_lp_table[(minor)].dev->port->irq
> +#define SNX_LP_BUFFER_SIZE PAGE_SIZE
> +#define SNX_LP_BASE(x) snx_lp_table[(x)].dev->port->base
> +
> +
> +struct snx_lp_struct {
> + struct pardevice *dev;
> + unsigned long flags;
> + unsigned int chars;
> + unsigned int time;
> + unsigned int wait;
> + char *lp_buffer;
> +
> + wait_queue_head_t waitq;
> +
> + unsigned int last_error;
> + struct mutex port_mutex;
> +
> + wait_queue_head_t dataq;
> +
> + long timeout;
> + unsigned int best_mode;
> + unsigned int current_mode;
> + unsigned long bits;
> +};
> +
Don't reimplement existing standard functions. LP already works ontop of
parport driver subsystem. You should write a parport driver instead.
> +#define SNX_LP_PINTEN 0x10
> +#define SNX_LP_PSELECP 0x08
> +#define SNX_LP_PINITP 0x04
> +#define SNX_LP_PAUTOLF 0x02
> +#define SNX_LP_PSTROBE 0x01
> +#define SNX_LP_DUMMY 0x00
> +#define SNX_LP_DELAY 50
> +
> +#endif
> diff --git a/drivers/mfd/sunix/snx_parallel.c b/drivers/mfd/sunix/snx_parallel.c
> new file mode 100644
> index 000000000000..17fdc48cd9b6
> --- /dev/null
> +++ b/drivers/mfd/sunix/snx_parallel.c
> @@ -0,0 +1,388 @@
> +// SPDX-License-Identifier: GPL-2.0
> +#include "snx_common.h"
> +
<snip>
> +static inline unsigned char sunix_parport_pc_read_control(struct parport *p)
If it's not the original PC parport, remove the misleading "pc" from the
function names.
> +static int sunix_parport_PS2_supported(struct parport *pb)
> +{
> + return 0;
> +}
> +
> +static int sunix_parport_EPP_supported(struct parport *pb)
> +{
> + return 0;
> +}
> +
> +
> +static int sunix_parport_ECPEPP_supported(struct parport *pb)
> +{
> + return 0;
> +}
> +
> +static int sunix_parport_ECPPS2_supported(struct parport *pb)
> +{
> + return 0;
> +}
do these really need to be defined, when they're just no-op anyways ?
> +struct parport *sunix_parport_pc_probe_port(struct sunix_par_port *priv)
> +{
> + struct parport_operations *ops = NULL;
> + struct parport *p = NULL;
> + struct resource *base_res;
> + struct resource *ecr_res = NULL;
> +
> + if (!priv)
> + goto out1;
> +
> + ops = kzalloc(sizeof(struct parport_operations), GFP_KERNEL);
use devm_ variant whenever possible.
> + if (!ops)
> + goto out1;
> +
> + p = sunix_parport_register_port(priv, ops);
> + if (!p)
> + goto out2;
> +
> + base_res = request_region(p->base, SNX_PAR_ADDRESS_LENGTH,
use devm_ variant whenever possible.
> + "snx_par_base");
> + if (!base_res)
> + goto out3;
> +
> + memcpy(ops, &parport_pc_ops, sizeof(struct parport_operations));
Is this dynamically allocated ops structure really needed ?
Can't see where it's actually used. And if it doesn't need to be
changes at runtime, directly take the reference to the original struct.
> +void sunix_parport_pc_unregister_port(struct parport *p)
> +{
> + struct sunix_par_port *priv = p->private_data;
> + struct parport_operations *ops = p->ops;
> +
> + sunix_parport_remove_port(p);
> +
> + spin_lock(&snx_ports_lock);
> + list_del_init(&priv->list);
> + spin_unlock(&snx_ports_lock);
Is that global list *really* necessary ?
> diff --git a/drivers/mfd/sunix/snx_ppdev.c b/drivers/mfd/sunix/snx_ppdev.c
> new file mode 100644
> index 000000000000..003839820340
> --- /dev/null
> +++ b/drivers/mfd/sunix/snx_ppdev.c
> @@ -0,0 +1,402 @@
> +// SPDX-License-Identifier: GPL-2.0
> +#include "snx_ppdev.h"
> +
> +#define SNX_PARPORT_MAX 4
> +#define SNX_CHRDEV "sppdev"
> +
> +static int SNX_PPD_MAJOR;
> +
> +struct snx_pp_struct {
> + struct pardevice *pdev;
Why not deriving from struct pardevice instead of separate structs ?
> +static ssize_t snx_pp_read(struct file *file,
> +char __user *buf, size_t count, loff_t *ppos)
Don't reimplement existing standard functions. LP already works ontop of
parport driver subsystem. You should write a parport driver instead.
> +static ssize_t snx_pp_write(struct file *file,
> +const char __user *buf, size_t count, loff_t *ppos)
Don't reimplement existing standard functions. LP already works ontop of
parport driver subsystem. You should write a parport driver instead.
> +static int snx_pp_open(struct inode *inode, struct file *file)
Don't reimplement existing standard functions. LP already works ontop of
parport driver subsystem. You should write a parport driver instead.
> +static int snx_pp_release(struct inode *inode, struct file *file)
Don't reimplement existing standard functions. LP already works ontop of
parport driver subsystem. You should write a parport driver instead.
> +static unsigned int snx_pp_poll(struct file *file, poll_table *wait)
Don't reimplement existing standard functions. LP already works ontop of
parport driver subsystem. You should write a parport driver instead.
> +static const struct file_operations pp_fops = {
> + .owner = THIS_MODULE,
> + .llseek = no_llseek,
> + .read = snx_pp_read,
> + .write = snx_pp_write,
> + .poll = snx_pp_poll,
> +
> + .open = snx_pp_open,
> + .release = snx_pp_release,
> +};
Don't reimplement existing standard functions. LP already works ontop of
parport driver subsystem. You should write a parport driver instead.
> +int sunix_par_ppdev_init(void)
> +{
> +
> + int err = 0;
> +
> + SNX_PPD_MAJOR = register_chrdev(0, SNX_CHRDEV, &pp_fops);
Don't reimplement existing standard functions. LP already works ontop of
parport driver subsystem. You should write a parport driver instead.
> diff --git a/drivers/mfd/sunix/snx_share.c b/drivers/mfd/sunix/snx_share.c
> new file mode 100644
> index 000000000000..327661b4ff50
> --- /dev/null
> +++ b/drivers/mfd/sunix/snx_share.c
> @@ -0,0 +1,634 @@
> +// SPDX-License-Identifier: GPL-2.0
> +#include "snx_common.h"
> +#define SNX_PARPORT_DEFAULT_TIMESLICE (HZ/5)
> +
> +int sunix_parport_default_spintime;
> +static struct parport *sunix_parport_get_port(struct parport *port);
> +struct parport *sunix_parport_find_base(unsigned long base);
> +
> +unsigned long sunix_parport_default_timeslice = SNX_PARPORT_DEFAULT_TIMESLICE;
> +int sunix_parport_default_spintime = DEFAULT_SPIN_TIME;
> +
> +static LIST_HEAD(snx_portlist);
> +static DEFINE_SPINLOCK(snx_full_list_lock);
> +
> +static DEFINE_SPINLOCK(snx_parportlist_lock);
> +
> +static LIST_HEAD(snx_all_ports);
> +static LIST_HEAD(snx_drivers);
> +
> +static DEFINE_SEMAPHORE(snx_registration_lock);
> +
> +static void sunix_dead_write_lines(
> +struct parport *p, unsigned char b)
> +{}
> +static unsigned char sunix_dead_read_lines(
> +struct parport *p)
> +{ return 0; }
> +static unsigned char sunix_dead_frob_lines(
> +struct parport *p, unsigned char b, unsigned char c)
> +{ return 0; }
> +static void sunix_dead_onearg(struct parport *p)
> +{}
> +static void sunix_dead_initstate(
> +struct pardevice *d, struct parport_state *s)
> +{}
> +static void sunix_dead_state(
> +struct parport *p, struct parport_state *s)
> +{}
> +static size_t sunix_dead_write(
> +struct parport *p, const void *b, size_t l, int f)
> +{ return 0; }
> +static size_t sunix_dead_read(
> +struct parport *p, void *b, size_t l, int f)
> +{ return 0; }
> +
> +
> +static struct parport_operations dead_ops = {
> + .write_data = sunix_dead_write_lines,
> + .read_data = sunix_dead_read_lines,
> + .write_control = sunix_dead_write_lines,
> + .read_control = sunix_dead_read_lines,
> + .frob_control = sunix_dead_frob_lines,
> + .read_status = sunix_dead_read_lines,
> + .enable_irq = sunix_dead_onearg,
> + .disable_irq = sunix_dead_onearg,
> + .data_forward = sunix_dead_onearg,
> + .data_reverse = sunix_dead_onearg,
> + .init_state = sunix_dead_initstate,
> + .save_state = sunix_dead_state,
> + .restore_state = sunix_dead_state,
> + .epp_write_data = sunix_dead_write,
> + .epp_read_data = sunix_dead_read,
> + .epp_write_addr = sunix_dead_write,
> + .epp_read_addr = sunix_dead_read,
> + .ecp_write_data = sunix_dead_write,
> + .ecp_read_data = sunix_dead_read,
> + .ecp_write_addr = sunix_dead_write,
> + .compat_write_data = sunix_dead_write,
> + .nibble_read_data = sunix_dead_read,
> + .byte_read_data = sunix_dead_read,
> + .owner = NULL,
> +
> +};
What exactly is "dead ops" supposed to mean ?
--mtx
--
Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
info@...ux.net -- +49-151-27565287
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