alistair23-linux/drivers/tty/serial/lantiq.c
Linus Torvalds e6b5be2be4 Driver core patches for 3.19-rc1
Here's the set of driver core patches for 3.19-rc1.
 
 They are dominated by the removal of the .owner field in platform
 drivers.  They touch a lot of files, but they are "simple" changes, just
 removing a line in a structure.
 
 Other than that, a few minor driver core and debugfs changes.  There are
 some ath9k patches coming in through this tree that have been acked by
 the wireless maintainers as they relied on the debugfs changes.
 
 Everything has been in linux-next for a while.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core update from Greg KH:
 "Here's the set of driver core patches for 3.19-rc1.

  They are dominated by the removal of the .owner field in platform
  drivers.  They touch a lot of files, but they are "simple" changes,
  just removing a line in a structure.

  Other than that, a few minor driver core and debugfs changes.  There
  are some ath9k patches coming in through this tree that have been
  acked by the wireless maintainers as they relied on the debugfs
  changes.

  Everything has been in linux-next for a while"

* tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (324 commits)
  Revert "ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries"
  fs: debugfs: add forward declaration for struct device type
  firmware class: Deletion of an unnecessary check before the function call "vunmap"
  firmware loader: fix hung task warning dump
  devcoredump: provide a one-way disable function
  device: Add dev_<level>_once variants
  ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries
  ath: use seq_file api for ath9k debugfs files
  debugfs: add helper function to create device related seq_file
  drivers/base: cacheinfo: remove noisy error boot message
  Revert "core: platform: add warning if driver has no owner"
  drivers: base: support cpu cache information interface to userspace via sysfs
  drivers: base: add cpu_device_create to support per-cpu devices
  topology: replace custom attribute macros with standard DEVICE_ATTR*
  cpumask: factor out show_cpumap into separate helper function
  driver core: Fix unbalanced device reference in drivers_probe
  driver core: fix race with userland in device_add()
  sysfs/kernfs: make read requests on pre-alloc files use the buffer.
  sysfs/kernfs: allow attributes to request write buffer be pre-allocated.
  fs: sysfs: return EGBIG on write if offset is larger than file size
  ...
2014-12-14 16:10:09 -08:00

772 lines
18 KiB
C

/*
* Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Copyright (C) 2004 Infineon IFAP DC COM CPE
* Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org>
* Copyright (C) 2007 John Crispin <blogic@openwrt.org>
* Copyright (C) 2010 Thomas Langer, <thomas.langer@lantiq.com>
*/
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/sysrq.h>
#include <linux/device.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial_core.h>
#include <linux/serial.h>
#include <linux/of_platform.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/gpio.h>
#include <lantiq_soc.h>
#define PORT_LTQ_ASC 111
#define MAXPORTS 2
#define UART_DUMMY_UER_RX 1
#define DRVNAME "lantiq,asc"
#ifdef __BIG_ENDIAN
#define LTQ_ASC_TBUF (0x0020 + 3)
#define LTQ_ASC_RBUF (0x0024 + 3)
#else
#define LTQ_ASC_TBUF 0x0020
#define LTQ_ASC_RBUF 0x0024
#endif
#define LTQ_ASC_FSTAT 0x0048
#define LTQ_ASC_WHBSTATE 0x0018
#define LTQ_ASC_STATE 0x0014
#define LTQ_ASC_IRNCR 0x00F8
#define LTQ_ASC_CLC 0x0000
#define LTQ_ASC_ID 0x0008
#define LTQ_ASC_PISEL 0x0004
#define LTQ_ASC_TXFCON 0x0044
#define LTQ_ASC_RXFCON 0x0040
#define LTQ_ASC_CON 0x0010
#define LTQ_ASC_BG 0x0050
#define LTQ_ASC_IRNREN 0x00F4
#define ASC_IRNREN_TX 0x1
#define ASC_IRNREN_RX 0x2
#define ASC_IRNREN_ERR 0x4
#define ASC_IRNREN_TX_BUF 0x8
#define ASC_IRNCR_TIR 0x1
#define ASC_IRNCR_RIR 0x2
#define ASC_IRNCR_EIR 0x4
#define ASCOPT_CSIZE 0x3
#define TXFIFO_FL 1
#define RXFIFO_FL 1
#define ASCCLC_DISS 0x2
#define ASCCLC_RMCMASK 0x0000FF00
#define ASCCLC_RMCOFFSET 8
#define ASCCON_M_8ASYNC 0x0
#define ASCCON_M_7ASYNC 0x2
#define ASCCON_ODD 0x00000020
#define ASCCON_STP 0x00000080
#define ASCCON_BRS 0x00000100
#define ASCCON_FDE 0x00000200
#define ASCCON_R 0x00008000
#define ASCCON_FEN 0x00020000
#define ASCCON_ROEN 0x00080000
#define ASCCON_TOEN 0x00100000
#define ASCSTATE_PE 0x00010000
#define ASCSTATE_FE 0x00020000
#define ASCSTATE_ROE 0x00080000
#define ASCSTATE_ANY (ASCSTATE_ROE|ASCSTATE_PE|ASCSTATE_FE)
#define ASCWHBSTATE_CLRREN 0x00000001
#define ASCWHBSTATE_SETREN 0x00000002
#define ASCWHBSTATE_CLRPE 0x00000004
#define ASCWHBSTATE_CLRFE 0x00000008
#define ASCWHBSTATE_CLRROE 0x00000020
#define ASCTXFCON_TXFEN 0x0001
#define ASCTXFCON_TXFFLU 0x0002
#define ASCTXFCON_TXFITLMASK 0x3F00
#define ASCTXFCON_TXFITLOFF 8
#define ASCRXFCON_RXFEN 0x0001
#define ASCRXFCON_RXFFLU 0x0002
#define ASCRXFCON_RXFITLMASK 0x3F00
#define ASCRXFCON_RXFITLOFF 8
#define ASCFSTAT_RXFFLMASK 0x003F
#define ASCFSTAT_TXFFLMASK 0x3F00
#define ASCFSTAT_TXFREEMASK 0x3F000000
#define ASCFSTAT_TXFREEOFF 24
static void lqasc_tx_chars(struct uart_port *port);
static struct ltq_uart_port *lqasc_port[MAXPORTS];
static struct uart_driver lqasc_reg;
static DEFINE_SPINLOCK(ltq_asc_lock);
struct ltq_uart_port {
struct uart_port port;
/* clock used to derive divider */
struct clk *fpiclk;
/* clock gating of the ASC core */
struct clk *clk;
unsigned int tx_irq;
unsigned int rx_irq;
unsigned int err_irq;
};
static inline struct
ltq_uart_port *to_ltq_uart_port(struct uart_port *port)
{
return container_of(port, struct ltq_uart_port, port);
}
static void
lqasc_stop_tx(struct uart_port *port)
{
return;
}
static void
lqasc_start_tx(struct uart_port *port)
{
unsigned long flags;
spin_lock_irqsave(&ltq_asc_lock, flags);
lqasc_tx_chars(port);
spin_unlock_irqrestore(&ltq_asc_lock, flags);
return;
}
static void
lqasc_stop_rx(struct uart_port *port)
{
ltq_w32(ASCWHBSTATE_CLRREN, port->membase + LTQ_ASC_WHBSTATE);
}
static int
lqasc_rx_chars(struct uart_port *port)
{
struct tty_port *tport = &port->state->port;
unsigned int ch = 0, rsr = 0, fifocnt;
fifocnt = ltq_r32(port->membase + LTQ_ASC_FSTAT) & ASCFSTAT_RXFFLMASK;
while (fifocnt--) {
u8 flag = TTY_NORMAL;
ch = ltq_r8(port->membase + LTQ_ASC_RBUF);
rsr = (ltq_r32(port->membase + LTQ_ASC_STATE)
& ASCSTATE_ANY) | UART_DUMMY_UER_RX;
tty_flip_buffer_push(tport);
port->icount.rx++;
/*
* Note that the error handling code is
* out of the main execution path
*/
if (rsr & ASCSTATE_ANY) {
if (rsr & ASCSTATE_PE) {
port->icount.parity++;
ltq_w32_mask(0, ASCWHBSTATE_CLRPE,
port->membase + LTQ_ASC_WHBSTATE);
} else if (rsr & ASCSTATE_FE) {
port->icount.frame++;
ltq_w32_mask(0, ASCWHBSTATE_CLRFE,
port->membase + LTQ_ASC_WHBSTATE);
}
if (rsr & ASCSTATE_ROE) {
port->icount.overrun++;
ltq_w32_mask(0, ASCWHBSTATE_CLRROE,
port->membase + LTQ_ASC_WHBSTATE);
}
rsr &= port->read_status_mask;
if (rsr & ASCSTATE_PE)
flag = TTY_PARITY;
else if (rsr & ASCSTATE_FE)
flag = TTY_FRAME;
}
if ((rsr & port->ignore_status_mask) == 0)
tty_insert_flip_char(tport, ch, flag);
if (rsr & ASCSTATE_ROE)
/*
* Overrun is special, since it's reported
* immediately, and doesn't affect the current
* character
*/
tty_insert_flip_char(tport, 0, TTY_OVERRUN);
}
if (ch != 0)
tty_flip_buffer_push(tport);
return 0;
}
static void
lqasc_tx_chars(struct uart_port *port)
{
struct circ_buf *xmit = &port->state->xmit;
if (uart_tx_stopped(port)) {
lqasc_stop_tx(port);
return;
}
while (((ltq_r32(port->membase + LTQ_ASC_FSTAT) &
ASCFSTAT_TXFREEMASK) >> ASCFSTAT_TXFREEOFF) != 0) {
if (port->x_char) {
ltq_w8(port->x_char, port->membase + LTQ_ASC_TBUF);
port->icount.tx++;
port->x_char = 0;
continue;
}
if (uart_circ_empty(xmit))
break;
ltq_w8(port->state->xmit.buf[port->state->xmit.tail],
port->membase + LTQ_ASC_TBUF);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
port->icount.tx++;
}
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
}
static irqreturn_t
lqasc_tx_int(int irq, void *_port)
{
unsigned long flags;
struct uart_port *port = (struct uart_port *)_port;
spin_lock_irqsave(&ltq_asc_lock, flags);
ltq_w32(ASC_IRNCR_TIR, port->membase + LTQ_ASC_IRNCR);
spin_unlock_irqrestore(&ltq_asc_lock, flags);
lqasc_start_tx(port);
return IRQ_HANDLED;
}
static irqreturn_t
lqasc_err_int(int irq, void *_port)
{
unsigned long flags;
struct uart_port *port = (struct uart_port *)_port;
spin_lock_irqsave(&ltq_asc_lock, flags);
/* clear any pending interrupts */
ltq_w32_mask(0, ASCWHBSTATE_CLRPE | ASCWHBSTATE_CLRFE |
ASCWHBSTATE_CLRROE, port->membase + LTQ_ASC_WHBSTATE);
spin_unlock_irqrestore(&ltq_asc_lock, flags);
return IRQ_HANDLED;
}
static irqreturn_t
lqasc_rx_int(int irq, void *_port)
{
unsigned long flags;
struct uart_port *port = (struct uart_port *)_port;
spin_lock_irqsave(&ltq_asc_lock, flags);
ltq_w32(ASC_IRNCR_RIR, port->membase + LTQ_ASC_IRNCR);
lqasc_rx_chars(port);
spin_unlock_irqrestore(&ltq_asc_lock, flags);
return IRQ_HANDLED;
}
static unsigned int
lqasc_tx_empty(struct uart_port *port)
{
int status;
status = ltq_r32(port->membase + LTQ_ASC_FSTAT) & ASCFSTAT_TXFFLMASK;
return status ? 0 : TIOCSER_TEMT;
}
static unsigned int
lqasc_get_mctrl(struct uart_port *port)
{
return TIOCM_CTS | TIOCM_CAR | TIOCM_DSR;
}
static void
lqasc_set_mctrl(struct uart_port *port, u_int mctrl)
{
}
static void
lqasc_break_ctl(struct uart_port *port, int break_state)
{
}
static int
lqasc_startup(struct uart_port *port)
{
struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
int retval;
if (!IS_ERR(ltq_port->clk))
clk_enable(ltq_port->clk);
port->uartclk = clk_get_rate(ltq_port->fpiclk);
ltq_w32_mask(ASCCLC_DISS | ASCCLC_RMCMASK, (1 << ASCCLC_RMCOFFSET),
port->membase + LTQ_ASC_CLC);
ltq_w32(0, port->membase + LTQ_ASC_PISEL);
ltq_w32(
((TXFIFO_FL << ASCTXFCON_TXFITLOFF) & ASCTXFCON_TXFITLMASK) |
ASCTXFCON_TXFEN | ASCTXFCON_TXFFLU,
port->membase + LTQ_ASC_TXFCON);
ltq_w32(
((RXFIFO_FL << ASCRXFCON_RXFITLOFF) & ASCRXFCON_RXFITLMASK)
| ASCRXFCON_RXFEN | ASCRXFCON_RXFFLU,
port->membase + LTQ_ASC_RXFCON);
/* make sure other settings are written to hardware before
* setting enable bits
*/
wmb();
ltq_w32_mask(0, ASCCON_M_8ASYNC | ASCCON_FEN | ASCCON_TOEN |
ASCCON_ROEN, port->membase + LTQ_ASC_CON);
retval = request_irq(ltq_port->tx_irq, lqasc_tx_int,
0, "asc_tx", port);
if (retval) {
pr_err("failed to request lqasc_tx_int\n");
return retval;
}
retval = request_irq(ltq_port->rx_irq, lqasc_rx_int,
0, "asc_rx", port);
if (retval) {
pr_err("failed to request lqasc_rx_int\n");
goto err1;
}
retval = request_irq(ltq_port->err_irq, lqasc_err_int,
0, "asc_err", port);
if (retval) {
pr_err("failed to request lqasc_err_int\n");
goto err2;
}
ltq_w32(ASC_IRNREN_RX | ASC_IRNREN_ERR | ASC_IRNREN_TX,
port->membase + LTQ_ASC_IRNREN);
return 0;
err2:
free_irq(ltq_port->rx_irq, port);
err1:
free_irq(ltq_port->tx_irq, port);
return retval;
}
static void
lqasc_shutdown(struct uart_port *port)
{
struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
free_irq(ltq_port->tx_irq, port);
free_irq(ltq_port->rx_irq, port);
free_irq(ltq_port->err_irq, port);
ltq_w32(0, port->membase + LTQ_ASC_CON);
ltq_w32_mask(ASCRXFCON_RXFEN, ASCRXFCON_RXFFLU,
port->membase + LTQ_ASC_RXFCON);
ltq_w32_mask(ASCTXFCON_TXFEN, ASCTXFCON_TXFFLU,
port->membase + LTQ_ASC_TXFCON);
if (!IS_ERR(ltq_port->clk))
clk_disable(ltq_port->clk);
}
static void
lqasc_set_termios(struct uart_port *port,
struct ktermios *new, struct ktermios *old)
{
unsigned int cflag;
unsigned int iflag;
unsigned int divisor;
unsigned int baud;
unsigned int con = 0;
unsigned long flags;
cflag = new->c_cflag;
iflag = new->c_iflag;
switch (cflag & CSIZE) {
case CS7:
con = ASCCON_M_7ASYNC;
break;
case CS5:
case CS6:
default:
new->c_cflag &= ~ CSIZE;
new->c_cflag |= CS8;
con = ASCCON_M_8ASYNC;
break;
}
cflag &= ~CMSPAR; /* Mark/Space parity is not supported */
if (cflag & CSTOPB)
con |= ASCCON_STP;
if (cflag & PARENB) {
if (!(cflag & PARODD))
con &= ~ASCCON_ODD;
else
con |= ASCCON_ODD;
}
port->read_status_mask = ASCSTATE_ROE;
if (iflag & INPCK)
port->read_status_mask |= ASCSTATE_FE | ASCSTATE_PE;
port->ignore_status_mask = 0;
if (iflag & IGNPAR)
port->ignore_status_mask |= ASCSTATE_FE | ASCSTATE_PE;
if (iflag & IGNBRK) {
/*
* If we're ignoring parity and break indicators,
* ignore overruns too (for real raw support).
*/
if (iflag & IGNPAR)
port->ignore_status_mask |= ASCSTATE_ROE;
}
if ((cflag & CREAD) == 0)
port->ignore_status_mask |= UART_DUMMY_UER_RX;
/* set error signals - framing, parity and overrun, enable receiver */
con |= ASCCON_FEN | ASCCON_TOEN | ASCCON_ROEN;
spin_lock_irqsave(&ltq_asc_lock, flags);
/* set up CON */
ltq_w32_mask(0, con, port->membase + LTQ_ASC_CON);
/* Set baud rate - take a divider of 2 into account */
baud = uart_get_baud_rate(port, new, old, 0, port->uartclk / 16);
divisor = uart_get_divisor(port, baud);
divisor = divisor / 2 - 1;
/* disable the baudrate generator */
ltq_w32_mask(ASCCON_R, 0, port->membase + LTQ_ASC_CON);
/* make sure the fractional divider is off */
ltq_w32_mask(ASCCON_FDE, 0, port->membase + LTQ_ASC_CON);
/* set up to use divisor of 2 */
ltq_w32_mask(ASCCON_BRS, 0, port->membase + LTQ_ASC_CON);
/* now we can write the new baudrate into the register */
ltq_w32(divisor, port->membase + LTQ_ASC_BG);
/* turn the baudrate generator back on */
ltq_w32_mask(0, ASCCON_R, port->membase + LTQ_ASC_CON);
/* enable rx */
ltq_w32(ASCWHBSTATE_SETREN, port->membase + LTQ_ASC_WHBSTATE);
spin_unlock_irqrestore(&ltq_asc_lock, flags);
/* Don't rewrite B0 */
if (tty_termios_baud_rate(new))
tty_termios_encode_baud_rate(new, baud, baud);
uart_update_timeout(port, cflag, baud);
}
static const char*
lqasc_type(struct uart_port *port)
{
if (port->type == PORT_LTQ_ASC)
return DRVNAME;
else
return NULL;
}
static void
lqasc_release_port(struct uart_port *port)
{
struct platform_device *pdev = to_platform_device(port->dev);
if (port->flags & UPF_IOREMAP) {
devm_iounmap(&pdev->dev, port->membase);
port->membase = NULL;
}
}
static int
lqasc_request_port(struct uart_port *port)
{
struct platform_device *pdev = to_platform_device(port->dev);
struct resource *res;
int size;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "cannot obtain I/O memory region");
return -ENODEV;
}
size = resource_size(res);
res = devm_request_mem_region(&pdev->dev, res->start,
size, dev_name(&pdev->dev));
if (!res) {
dev_err(&pdev->dev, "cannot request I/O memory region");
return -EBUSY;
}
if (port->flags & UPF_IOREMAP) {
port->membase = devm_ioremap_nocache(&pdev->dev,
port->mapbase, size);
if (port->membase == NULL)
return -ENOMEM;
}
return 0;
}
static void
lqasc_config_port(struct uart_port *port, int flags)
{
if (flags & UART_CONFIG_TYPE) {
port->type = PORT_LTQ_ASC;
lqasc_request_port(port);
}
}
static int
lqasc_verify_port(struct uart_port *port,
struct serial_struct *ser)
{
int ret = 0;
if (ser->type != PORT_UNKNOWN && ser->type != PORT_LTQ_ASC)
ret = -EINVAL;
if (ser->irq < 0 || ser->irq >= NR_IRQS)
ret = -EINVAL;
if (ser->baud_base < 9600)
ret = -EINVAL;
return ret;
}
static struct uart_ops lqasc_pops = {
.tx_empty = lqasc_tx_empty,
.set_mctrl = lqasc_set_mctrl,
.get_mctrl = lqasc_get_mctrl,
.stop_tx = lqasc_stop_tx,
.start_tx = lqasc_start_tx,
.stop_rx = lqasc_stop_rx,
.break_ctl = lqasc_break_ctl,
.startup = lqasc_startup,
.shutdown = lqasc_shutdown,
.set_termios = lqasc_set_termios,
.type = lqasc_type,
.release_port = lqasc_release_port,
.request_port = lqasc_request_port,
.config_port = lqasc_config_port,
.verify_port = lqasc_verify_port,
};
static void
lqasc_console_putchar(struct uart_port *port, int ch)
{
int fifofree;
if (!port->membase)
return;
do {
fifofree = (ltq_r32(port->membase + LTQ_ASC_FSTAT)
& ASCFSTAT_TXFREEMASK) >> ASCFSTAT_TXFREEOFF;
} while (fifofree == 0);
ltq_w8(ch, port->membase + LTQ_ASC_TBUF);
}
static void
lqasc_console_write(struct console *co, const char *s, u_int count)
{
struct ltq_uart_port *ltq_port;
struct uart_port *port;
unsigned long flags;
if (co->index >= MAXPORTS)
return;
ltq_port = lqasc_port[co->index];
if (!ltq_port)
return;
port = &ltq_port->port;
spin_lock_irqsave(&ltq_asc_lock, flags);
uart_console_write(port, s, count, lqasc_console_putchar);
spin_unlock_irqrestore(&ltq_asc_lock, flags);
}
static int __init
lqasc_console_setup(struct console *co, char *options)
{
struct ltq_uart_port *ltq_port;
struct uart_port *port;
int baud = 115200;
int bits = 8;
int parity = 'n';
int flow = 'n';
if (co->index >= MAXPORTS)
return -ENODEV;
ltq_port = lqasc_port[co->index];
if (!ltq_port)
return -ENODEV;
port = &ltq_port->port;
if (!IS_ERR(ltq_port->clk))
clk_enable(ltq_port->clk);
port->uartclk = clk_get_rate(ltq_port->fpiclk);
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
return uart_set_options(port, co, baud, parity, bits, flow);
}
static struct console lqasc_console = {
.name = "ttyLTQ",
.write = lqasc_console_write,
.device = uart_console_device,
.setup = lqasc_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &lqasc_reg,
};
static int __init
lqasc_console_init(void)
{
register_console(&lqasc_console);
return 0;
}
console_initcall(lqasc_console_init);
static struct uart_driver lqasc_reg = {
.owner = THIS_MODULE,
.driver_name = DRVNAME,
.dev_name = "ttyLTQ",
.major = 0,
.minor = 0,
.nr = MAXPORTS,
.cons = &lqasc_console,
};
static int __init
lqasc_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
struct ltq_uart_port *ltq_port;
struct uart_port *port;
struct resource *mmres, irqres[3];
int line = 0;
int ret;
mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
ret = of_irq_to_resource_table(node, irqres, 3);
if (!mmres || (ret != 3)) {
dev_err(&pdev->dev,
"failed to get memory/irq for serial port\n");
return -ENODEV;
}
/* check if this is the console port */
if (mmres->start != CPHYSADDR(LTQ_EARLY_ASC))
line = 1;
if (lqasc_port[line]) {
dev_err(&pdev->dev, "port %d already allocated\n", line);
return -EBUSY;
}
ltq_port = devm_kzalloc(&pdev->dev, sizeof(struct ltq_uart_port),
GFP_KERNEL);
if (!ltq_port)
return -ENOMEM;
port = &ltq_port->port;
port->iotype = SERIAL_IO_MEM;
port->flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP;
port->ops = &lqasc_pops;
port->fifosize = 16;
port->type = PORT_LTQ_ASC,
port->line = line;
port->dev = &pdev->dev;
/* unused, just to be backward-compatible */
port->irq = irqres[0].start;
port->mapbase = mmres->start;
ltq_port->fpiclk = clk_get_fpi();
if (IS_ERR(ltq_port->fpiclk)) {
pr_err("failed to get fpi clk\n");
return -ENOENT;
}
/* not all asc ports have clock gates, lets ignore the return code */
ltq_port->clk = clk_get(&pdev->dev, NULL);
ltq_port->tx_irq = irqres[0].start;
ltq_port->rx_irq = irqres[1].start;
ltq_port->err_irq = irqres[2].start;
lqasc_port[line] = ltq_port;
platform_set_drvdata(pdev, ltq_port);
ret = uart_add_one_port(&lqasc_reg, port);
return ret;
}
static const struct of_device_id ltq_asc_match[] = {
{ .compatible = DRVNAME },
{},
};
MODULE_DEVICE_TABLE(of, ltq_asc_match);
static struct platform_driver lqasc_driver = {
.driver = {
.name = DRVNAME,
.of_match_table = ltq_asc_match,
},
};
int __init
init_lqasc(void)
{
int ret;
ret = uart_register_driver(&lqasc_reg);
if (ret != 0)
return ret;
ret = platform_driver_probe(&lqasc_driver, lqasc_probe);
if (ret != 0)
uart_unregister_driver(&lqasc_reg);
return ret;
}
module_init(init_lqasc);
MODULE_DESCRIPTION("Lantiq serial port driver");
MODULE_LICENSE("GPL");