linux/drivers/tty/serial/lantiq.c
Bhumika Goyal 2331e06865 tty: serial: constify uart_ops structures
Declare uart_ops structures as const as they are only stored in the ops
field of an uart_port structure. This field is of type const, so
uart_ops structures having this property can be made const too.

File size details before and after patching.
First line of every .o file shows the file size before patching
and second line shows the size after patching.

   text	   data	    bss	    dec	    hex	filename

   2977	    456	     64	   3497	    da9	drivers/tty/serial/amba-pl010.o
   3169	    272	     64	   3505	    db1	drivers/tty/serial/amba-pl010.o

   3109	    456	      0	   3565	    ded	drivers/tty/serial/efm32-uart.o
   3301	    272	      0	   3573	    df5	drivers/tty/serial/efm32-uart.o

  10668	    753	      1	  11422	   2c9e	drivers/tty/serial/icom.o
  10860	    561	      1	  11422	   2c9e	drivers/tty/serial/icom.o

  23904	    408	      8	  24320	   5f00	drivers/tty/serial/ioc3_serial.o
  24088	    224	      8	  24320	   5f00	drivers/tty/serial/ioc3_serial.o

  10516	    560	      4	  11080	   2b48	drivers/tty/serial/ioc4_serial.o
  10709	    368	      4	  11081	   2b49	drivers/tty/serial/ioc4_serial.o

   7853	    648	   1216	   9717	   25f5	drivers/tty/serial/mpsc.o
   8037	    456	   1216	   9709	   25ed	drivers/tty/serial/mpsc.o

  10248	    456	      0	  10704	   29d0	drivers/tty/serial/omap-serial.o
  10440	    272	      0	  10712	   29d8	drivers/tty/serial/omap-serial.o

   8122	    532	   1984	  10638	   298e	drivers/tty/serial/pmac_zilog.o
   8306	    340	   1984	  10630	   2986	drivers/tty/serial/pmac_zilog.o

   3808	    456	      0	   4264	   10a8	drivers/tty/serial/pxa.o
   4000	    264	      0	   4264	   10a8	drivers/tty/serial/pxa.o

  21781	   3864	      0	  25645	   642d	drivers/tty/serial/serial-tegra.o
  22037	   3608	      0	  25645	   642d	drivers/tty/serial/serial-tegra.o

   2481	    456	     96	   3033	    bd9	drivers/tty/serial/sprd_serial.o
   2673	    272	     96	   3041	    be1	drivers/tty/serial/sprd_serial.o

   5534	    300	    512	   6346	   18ca	drivers/tty/serial/vr41xx_siu.o
   5630	    204	    512	   6346	   18ca	drivers/tty/serial/vr41xx_siu.o

   6730	   1576	    128	   8434	   20f2	drivers/tty/serial/vt8500_serial.o
   6986	   1320	    128	   8434	   20f2	drivers/tty/serial/vt8500_serial.o

Cross compiled for mips architecture.

   3005	    488	      0	   3493	    da5	drivers/tty/serial/pnx8xxx_uart.o
   3189	    304	      0	   3493	    da5	drivers/tty/serial/pnx8xxx_uart.o

   4272	    196	   1056	   5524	   1594	drivers/tty/serial/dz.o
   4368	    100	   1056	   5524	   1594	drivers/tty/serial/dz.o

   6551	    144	     16	   6711	   1a37	drivers/tty/serial/ip22zilog.o
   6647	     48	     16	   6711	   1a37	drivers/tty/serial/ip22zilog.o

   9612	    428	   1520	  11560	   2d28	drivers/tty/serial/serial_txx9.o
   9708	    332	   1520	  11560	   2d28	drivers/tty/serial/serial_txx9.o

   4156	    296	     16	   4468	   1174	drivers/tty/serial/ar933x_uart.o
   4252	    200	     16	   4468	   1174	drivers/tty/serial/ar933x_uart.o

Cross compiled for arm archiecture.

  11716	   1780	     44	  13540	   34e4	drivers/tty/serial/sirfsoc_uart.o
  11808	   1688	     44	  13540	   34e4	drivers/tty/serial/sirfsoc_uart.o

  13352	    596	     56	  14004	   36b4	drivers/tty/serial/amba-pl011.o
  13444	    504	     56	  14004	   36b4	drivers/tty/serial/amba-pl011.o

Cross compiled for sparc architecture.

   4664	    528	     32	   5224	   1468	drivers/tty/serial/sunhv.o
   4848	    344	     32	   5224	   1468	drivers/tty/serial/sunhv.o

   8080	    332	     28	   8440	   20f8	drivers/tty/serial/sunzilog.o
   8184	    228	     28	   8440	   20f8	drivers/tty/serial/sunzilog.o

Cross compiled for ia64 architecture.

  10226	    549	    472	  11247	   2bef	drivers/tty/serial/sn_console.o
  10414	    365	    472	  11251	   2bf3	drivers/tty/serial/sn_console.o

The files drivers/tty/serial/zs.o, drivers/tty/serial/lpc32xx_hs.o and
drivers/tty/serial/lantiq.o did not compile.

Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-01-27 09:23:36 +01:00

790 lines
19 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 <john@phrozen.org>
* Copyright (C) 2010 Thomas Langer, <thomas.langer@lantiq.com>
*/
#include <linux/slab.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 const 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_serial_port_write(struct uart_port *port, const char *s,
u_int count)
{
unsigned long flags;
spin_lock_irqsave(&ltq_asc_lock, flags);
uart_console_write(port, s, count, lqasc_console_putchar);
spin_unlock_irqrestore(&ltq_asc_lock, flags);
}
static void
lqasc_console_write(struct console *co, const char *s, u_int count)
{
struct ltq_uart_port *ltq_port;
if (co->index >= MAXPORTS)
return;
ltq_port = lqasc_port[co->index];
if (!ltq_port)
return;
lqasc_serial_port_write(&ltq_port->port, s, count);
}
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 void lqasc_serial_early_console_write(struct console *co,
const char *s,
u_int count)
{
struct earlycon_device *dev = co->data;
lqasc_serial_port_write(&dev->port, s, count);
}
static int __init
lqasc_serial_early_console_setup(struct earlycon_device *device,
const char *opt)
{
if (!device->port.membase)
return -ENODEV;
device->con->write = lqasc_serial_early_console_write;
return 0;
}
OF_EARLYCON_DECLARE(lantiq, DRVNAME, lqasc_serial_early_console_setup);
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 },
{},
};
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;
}
device_initcall(init_lqasc);