linux_dsm_epyc7002/drivers/tty/serial/vt8500_serial.c

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tty: add SPDX identifiers to all remaining files in drivers/tty/ It's good to have SPDX identifiers in all files to make it easier to audit the kernel tree for correct licenses. Update the drivers/tty files files with the correct SPDX license identifier based on the license text in the file itself. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This work is based on a script and data from Thomas Gleixner, Philippe Ombredanne, and Kate Stewart. Cc: Jiri Slaby <jslaby@suse.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Chris Metcalf <cmetcalf@mellanox.com> Cc: Jiri Kosina <jikos@kernel.org> Cc: David Sterba <dsterba@suse.com> Cc: James Hogan <jhogan@kernel.org> Cc: Rob Herring <robh@kernel.org> Cc: Eric Anholt <eric@anholt.net> Cc: Stefan Wahren <stefan.wahren@i2se.com> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: Ray Jui <rjui@broadcom.com> Cc: Scott Branden <sbranden@broadcom.com> Cc: bcm-kernel-feedback-list@broadcom.com Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: Helge Deller <deller@gmx.de> Cc: Joachim Eastwood <manabian@gmail.com> Cc: Matthias Brugger <matthias.bgg@gmail.com> Cc: Masahiro Yamada <yamada.masahiro@socionext.com> Cc: Tobias Klauser <tklauser@distanz.ch> Cc: Russell King <linux@armlinux.org.uk> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Richard Genoud <richard.genoud@gmail.com> Cc: Alexander Shiyan <shc_work@mail.ru> Cc: Baruch Siach <baruch@tkos.co.il> Cc: "Maciej W. Rozycki" <macro@linux-mips.org> Cc: "Uwe Kleine-König" <kernel@pengutronix.de> Cc: Pat Gefre <pfg@sgi.com> Cc: "Guilherme G. Piccoli" <gpiccoli@linux.vnet.ibm.com> Cc: Jason Wessel <jason.wessel@windriver.com> Cc: Vladimir Zapolskiy <vz@mleia.com> Cc: Sylvain Lemieux <slemieux.tyco@gmail.com> Cc: Carlo Caione <carlo@caione.org> Cc: Kevin Hilman <khilman@baylibre.com> Cc: Liviu Dudau <liviu.dudau@arm.com> Cc: Sudeep Holla <sudeep.holla@arm.com> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: Andy Gross <andy.gross@linaro.org> Cc: David Brown <david.brown@linaro.org> Cc: "Andreas Färber" <afaerber@suse.de> Cc: Kevin Cernekee <cernekee@gmail.com> Cc: Laxman Dewangan <ldewangan@nvidia.com> Cc: Thierry Reding <thierry.reding@gmail.com> Cc: Jonathan Hunter <jonathanh@nvidia.com> Cc: Barry Song <baohua@kernel.org> Cc: Patrice Chotard <patrice.chotard@st.com> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: Alexandre Torgue <alexandre.torgue@st.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Peter Korsgaard <jacmet@sunsite.dk> Cc: Timur Tabi <timur@tabi.org> Cc: Tony Prisk <linux@prisktech.co.nz> Cc: Michal Simek <michal.simek@xilinx.com> Cc: "Sören Brinkmann" <soren.brinkmann@xilinx.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Kate Stewart <kstewart@linuxfoundation.org> Cc: Philippe Ombredanne <pombredanne@nexb.com> Cc: Jiri Slaby <jslaby@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-07 00:11:51 +07:00
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
*
* Based on msm_serial.c, which is:
* Copyright (C) 2007 Google, Inc.
* Author: Robert Love <rlove@google.com>
*/
#if defined(CONFIG_SERIAL_VT8500_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
# define SUPPORT_SYSRQ
#endif
#include <linux/hrtimer.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/irq.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial_core.h>
#include <linux/serial.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/err.h>
/*
* UART Register offsets
*/
#define VT8500_URTDR 0x0000 /* Transmit data */
#define VT8500_URRDR 0x0004 /* Receive data */
#define VT8500_URDIV 0x0008 /* Clock/Baud rate divisor */
#define VT8500_URLCR 0x000C /* Line control */
#define VT8500_URICR 0x0010 /* IrDA control */
#define VT8500_URIER 0x0014 /* Interrupt enable */
#define VT8500_URISR 0x0018 /* Interrupt status */
#define VT8500_URUSR 0x001c /* UART status */
#define VT8500_URFCR 0x0020 /* FIFO control */
#define VT8500_URFIDX 0x0024 /* FIFO index */
#define VT8500_URBKR 0x0028 /* Break signal count */
#define VT8500_URTOD 0x002c /* Time out divisor */
#define VT8500_TXFIFO 0x1000 /* Transmit FIFO (16x8) */
#define VT8500_RXFIFO 0x1020 /* Receive FIFO (16x10) */
/*
* Interrupt enable and status bits
*/
#define TXDE (1 << 0) /* Tx Data empty */
#define RXDF (1 << 1) /* Rx Data full */
#define TXFAE (1 << 2) /* Tx FIFO almost empty */
#define TXFE (1 << 3) /* Tx FIFO empty */
#define RXFAF (1 << 4) /* Rx FIFO almost full */
#define RXFF (1 << 5) /* Rx FIFO full */
#define TXUDR (1 << 6) /* Tx underrun */
#define RXOVER (1 << 7) /* Rx overrun */
#define PER (1 << 8) /* Parity error */
#define FER (1 << 9) /* Frame error */
#define TCTS (1 << 10) /* Toggle of CTS */
#define RXTOUT (1 << 11) /* Rx timeout */
#define BKDONE (1 << 12) /* Break signal done */
#define ERR (1 << 13) /* AHB error response */
#define RX_FIFO_INTS (RXFAF | RXFF | RXOVER | PER | FER | RXTOUT)
#define TX_FIFO_INTS (TXFAE | TXFE | TXUDR)
/*
* Line control bits
*/
#define VT8500_TXEN (1 << 0) /* Enable transmit logic */
#define VT8500_RXEN (1 << 1) /* Enable receive logic */
#define VT8500_CS8 (1 << 2) /* 8-bit data length (vs. 7-bit) */
#define VT8500_CSTOPB (1 << 3) /* 2 stop bits (vs. 1) */
#define VT8500_PARENB (1 << 4) /* Enable parity */
#define VT8500_PARODD (1 << 5) /* Odd parity (vs. even) */
#define VT8500_RTS (1 << 6) /* Ready to send */
#define VT8500_LOOPBK (1 << 7) /* Enable internal loopback */
#define VT8500_DMA (1 << 8) /* Enable DMA mode (needs FIFO) */
#define VT8500_BREAK (1 << 9) /* Initiate break signal */
#define VT8500_PSLVERR (1 << 10) /* APB error upon empty RX FIFO read */
#define VT8500_SWRTSCTS (1 << 11) /* Software-controlled RTS/CTS */
/*
* Capability flags (driver-internal)
*/
#define VT8500_HAS_SWRTSCTS_SWITCH (1 << 1)
#define VT8500_RECOMMENDED_CLK 12000000
#define VT8500_OVERSAMPLING_DIVISOR 13
#define VT8500_MAX_PORTS 6
struct vt8500_port {
struct uart_port uart;
char name[16];
struct clk *clk;
unsigned int clk_predivisor;
unsigned int ier;
unsigned int vt8500_uart_flags;
};
/*
* we use this variable to keep track of which ports
* have been allocated as we can't use pdev->id in
* devicetree
*/
static DECLARE_BITMAP(vt8500_ports_in_use, VT8500_MAX_PORTS);
static inline void vt8500_write(struct uart_port *port, unsigned int val,
unsigned int off)
{
writel(val, port->membase + off);
}
static inline unsigned int vt8500_read(struct uart_port *port, unsigned int off)
{
return readl(port->membase + off);
}
static void vt8500_stop_tx(struct uart_port *port)
{
struct vt8500_port *vt8500_port = container_of(port,
struct vt8500_port,
uart);
vt8500_port->ier &= ~TX_FIFO_INTS;
vt8500_write(port, vt8500_port->ier, VT8500_URIER);
}
static void vt8500_stop_rx(struct uart_port *port)
{
struct vt8500_port *vt8500_port = container_of(port,
struct vt8500_port,
uart);
vt8500_port->ier &= ~RX_FIFO_INTS;
vt8500_write(port, vt8500_port->ier, VT8500_URIER);
}
static void vt8500_enable_ms(struct uart_port *port)
{
struct vt8500_port *vt8500_port = container_of(port,
struct vt8500_port,
uart);
vt8500_port->ier |= TCTS;
vt8500_write(port, vt8500_port->ier, VT8500_URIER);
}
static void handle_rx(struct uart_port *port)
{
struct tty_port *tport = &port->state->port;
/*
* Handle overrun
*/
if ((vt8500_read(port, VT8500_URISR) & RXOVER)) {
port->icount.overrun++;
tty_insert_flip_char(tport, 0, TTY_OVERRUN);
}
/* and now the main RX loop */
while (vt8500_read(port, VT8500_URFIDX) & 0x1f00) {
unsigned int c;
char flag = TTY_NORMAL;
c = readw(port->membase + VT8500_RXFIFO) & 0x3ff;
/* Mask conditions we're ignorning. */
c &= ~port->read_status_mask;
if (c & FER) {
port->icount.frame++;
flag = TTY_FRAME;
} else if (c & PER) {
port->icount.parity++;
flag = TTY_PARITY;
}
port->icount.rx++;
if (!uart_handle_sysrq_char(port, c))
tty_insert_flip_char(tport, c, flag);
}
tty: serial: vt8500: drop uart_port->lock before calling tty_flip_buffer_push() The current driver triggers a lockdep warning for if tty_flip_buffer_push() is called with uart_port->lock locked. This never shows up on UP kernels and comes up only on SMP kernels. Crash looks like this (produced with samsung.c driver): ----- [<c0014d58>] (unwind_backtrace+0x0/0xf8) from [<c0011908>] (show_stack+0x10/0x14) [<c0011908>] (show_stack+0x10/0x14) from [<c035da34>] (dump_stack+0x6c/0xac) [<c035da34>] (dump_stack+0x6c/0xac) from [<c01b59ac>] (do_raw_spin_unlock+0xc4/0xd8) [<c01b59ac>] (do_raw_spin_unlock+0xc4/0xd8) from [<c03627e4>] (_raw_spin_unlock_irqrestore+0xc/0) [<c03627e4>] (_raw_spin_unlock_irqrestore+0xc/0x38) from [<c020a1a8>] (s3c24xx_serial_rx_chars+0) [<c020a1a8>] (s3c24xx_serial_rx_chars+0x12c/0x260) from [<c020aae8>] (s3c64xx_serial_handle_irq+) [<c020aae8>] (s3c64xx_serial_handle_irq+0x48/0x60) from [<c006aaa0>] (handle_irq_event_percpu+0x) [<c006aaa0>] (handle_irq_event_percpu+0x50/0x194) from [<c006ac20>] (handle_irq_event+0x3c/0x5c) [<c006ac20>] (handle_irq_event+0x3c/0x5c) from [<c006d864>] (handle_fasteoi_irq+0x80/0x13c) [<c006d864>] (handle_fasteoi_irq+0x80/0x13c) from [<c006a4a4>] (generic_handle_irq+0x20/0x30) [<c006a4a4>] (generic_handle_irq+0x20/0x30) from [<c000f454>] (handle_IRQ+0x38/0x94) [<c000f454>] (handle_IRQ+0x38/0x94) from [<c0008538>] (gic_handle_irq+0x34/0x68) [<c0008538>] (gic_handle_irq+0x34/0x68) from [<c00123c0>] (__irq_svc+0x40/0x70) Exception stack(0xc04cdf70 to 0xc04cdfb8) df60: 00000000 00000000 0000166e 00000000 df80: c04cc000 c050278f c050278f 00000001 c04d444c 410fc0f4 c03649b0 00000000 dfa0: 00000001 c04cdfb8 c000f758 c000f75c 60070013 ffffffff [<c00123c0>] (__irq_svc+0x40/0x70) from [<c000f75c>] (arch_cpu_idle+0x28/0x30) [<c000f75c>] (arch_cpu_idle+0x28/0x30) from [<c0054888>] (cpu_startup_entry+0x5c/0x148) [<c0054888>] (cpu_startup_entry+0x5c/0x148) from [<c0497aa4>] (start_kernel+0x334/0x38c) BUG: spinlock lockup suspected on CPU#0, kworker/0:1/360 lock: s3c24xx_serial_ports+0x1d8/0x370, .magic: dead4ead, .owner: <none>/-1, .owner_cpu: -1 CPU: 0 PID: 360 Comm: kworker/0:1 Not tainted 3.11.0-rc6-next-20130819-00003-g75485f1 #2 Workqueue: events flush_to_ldisc [<c0014d58>] (unwind_backtrace+0x0/0xf8) from [<c0011908>] (show_stack+0x10/0x14) [<c0011908>] (show_stack+0x10/0x14) from [<c035da34>] (dump_stack+0x6c/0xac) [<c035da34>] (dump_stack+0x6c/0xac) from [<c01b581c>] (do_raw_spin_lock+0x100/0x17c) [<c01b581c>] (do_raw_spin_lock+0x100/0x17c) from [<c03628a0>] (_raw_spin_lock_irqsave+0x20/0x28) [<c03628a0>] (_raw_spin_lock_irqsave+0x20/0x28) from [<c0203224>] (uart_start+0x18/0x34) [<c0203224>] (uart_start+0x18/0x34) from [<c01ef890>] (__receive_buf+0x4b4/0x738) [<c01ef890>] (__receive_buf+0x4b4/0x738) from [<c01efb44>] (n_tty_receive_buf2+0x30/0x98) [<c01efb44>] (n_tty_receive_buf2+0x30/0x98) from [<c01f2ba8>] (flush_to_ldisc+0xec/0x138) [<c01f2ba8>] (flush_to_ldisc+0xec/0x138) from [<c0031af0>] (process_one_work+0xfc/0x348) [<c0031af0>] (process_one_work+0xfc/0x348) from [<c0032138>] (worker_thread+0x138/0x37c) [<c0032138>] (worker_thread+0x138/0x37c) from [<c0037a7c>] (kthread+0xa4/0xb0) [<c0037a7c>] (kthread+0xa4/0xb0) from [<c000e5f8>] (ret_from_fork+0x14/0x3c) ----- Release the port lock before calling tty_flip_buffer_push() and reacquire it after the call. Similar stuff was already done for few other drivers in the past, like: commit 2389b272168ceec056ca1d8a870a97fa9c26e11a Author: Thomas Gleixner <tglx@linutronix.de> Date: Tue May 29 21:53:50 2007 +0100 [ARM] 4417/1: Serial: Fix AMBA drivers locking Cc: Tony Prisk <linux@prisktech.co.nz> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-08-19 21:44:29 +07:00
spin_unlock(&port->lock);
tty_flip_buffer_push(tport);
tty: serial: vt8500: drop uart_port->lock before calling tty_flip_buffer_push() The current driver triggers a lockdep warning for if tty_flip_buffer_push() is called with uart_port->lock locked. This never shows up on UP kernels and comes up only on SMP kernels. Crash looks like this (produced with samsung.c driver): ----- [<c0014d58>] (unwind_backtrace+0x0/0xf8) from [<c0011908>] (show_stack+0x10/0x14) [<c0011908>] (show_stack+0x10/0x14) from [<c035da34>] (dump_stack+0x6c/0xac) [<c035da34>] (dump_stack+0x6c/0xac) from [<c01b59ac>] (do_raw_spin_unlock+0xc4/0xd8) [<c01b59ac>] (do_raw_spin_unlock+0xc4/0xd8) from [<c03627e4>] (_raw_spin_unlock_irqrestore+0xc/0) [<c03627e4>] (_raw_spin_unlock_irqrestore+0xc/0x38) from [<c020a1a8>] (s3c24xx_serial_rx_chars+0) [<c020a1a8>] (s3c24xx_serial_rx_chars+0x12c/0x260) from [<c020aae8>] (s3c64xx_serial_handle_irq+) [<c020aae8>] (s3c64xx_serial_handle_irq+0x48/0x60) from [<c006aaa0>] (handle_irq_event_percpu+0x) [<c006aaa0>] (handle_irq_event_percpu+0x50/0x194) from [<c006ac20>] (handle_irq_event+0x3c/0x5c) [<c006ac20>] (handle_irq_event+0x3c/0x5c) from [<c006d864>] (handle_fasteoi_irq+0x80/0x13c) [<c006d864>] (handle_fasteoi_irq+0x80/0x13c) from [<c006a4a4>] (generic_handle_irq+0x20/0x30) [<c006a4a4>] (generic_handle_irq+0x20/0x30) from [<c000f454>] (handle_IRQ+0x38/0x94) [<c000f454>] (handle_IRQ+0x38/0x94) from [<c0008538>] (gic_handle_irq+0x34/0x68) [<c0008538>] (gic_handle_irq+0x34/0x68) from [<c00123c0>] (__irq_svc+0x40/0x70) Exception stack(0xc04cdf70 to 0xc04cdfb8) df60: 00000000 00000000 0000166e 00000000 df80: c04cc000 c050278f c050278f 00000001 c04d444c 410fc0f4 c03649b0 00000000 dfa0: 00000001 c04cdfb8 c000f758 c000f75c 60070013 ffffffff [<c00123c0>] (__irq_svc+0x40/0x70) from [<c000f75c>] (arch_cpu_idle+0x28/0x30) [<c000f75c>] (arch_cpu_idle+0x28/0x30) from [<c0054888>] (cpu_startup_entry+0x5c/0x148) [<c0054888>] (cpu_startup_entry+0x5c/0x148) from [<c0497aa4>] (start_kernel+0x334/0x38c) BUG: spinlock lockup suspected on CPU#0, kworker/0:1/360 lock: s3c24xx_serial_ports+0x1d8/0x370, .magic: dead4ead, .owner: <none>/-1, .owner_cpu: -1 CPU: 0 PID: 360 Comm: kworker/0:1 Not tainted 3.11.0-rc6-next-20130819-00003-g75485f1 #2 Workqueue: events flush_to_ldisc [<c0014d58>] (unwind_backtrace+0x0/0xf8) from [<c0011908>] (show_stack+0x10/0x14) [<c0011908>] (show_stack+0x10/0x14) from [<c035da34>] (dump_stack+0x6c/0xac) [<c035da34>] (dump_stack+0x6c/0xac) from [<c01b581c>] (do_raw_spin_lock+0x100/0x17c) [<c01b581c>] (do_raw_spin_lock+0x100/0x17c) from [<c03628a0>] (_raw_spin_lock_irqsave+0x20/0x28) [<c03628a0>] (_raw_spin_lock_irqsave+0x20/0x28) from [<c0203224>] (uart_start+0x18/0x34) [<c0203224>] (uart_start+0x18/0x34) from [<c01ef890>] (__receive_buf+0x4b4/0x738) [<c01ef890>] (__receive_buf+0x4b4/0x738) from [<c01efb44>] (n_tty_receive_buf2+0x30/0x98) [<c01efb44>] (n_tty_receive_buf2+0x30/0x98) from [<c01f2ba8>] (flush_to_ldisc+0xec/0x138) [<c01f2ba8>] (flush_to_ldisc+0xec/0x138) from [<c0031af0>] (process_one_work+0xfc/0x348) [<c0031af0>] (process_one_work+0xfc/0x348) from [<c0032138>] (worker_thread+0x138/0x37c) [<c0032138>] (worker_thread+0x138/0x37c) from [<c0037a7c>] (kthread+0xa4/0xb0) [<c0037a7c>] (kthread+0xa4/0xb0) from [<c000e5f8>] (ret_from_fork+0x14/0x3c) ----- Release the port lock before calling tty_flip_buffer_push() and reacquire it after the call. Similar stuff was already done for few other drivers in the past, like: commit 2389b272168ceec056ca1d8a870a97fa9c26e11a Author: Thomas Gleixner <tglx@linutronix.de> Date: Tue May 29 21:53:50 2007 +0100 [ARM] 4417/1: Serial: Fix AMBA drivers locking Cc: Tony Prisk <linux@prisktech.co.nz> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-08-19 21:44:29 +07:00
spin_lock(&port->lock);
}
static void handle_tx(struct uart_port *port)
{
struct circ_buf *xmit = &port->state->xmit;
if (port->x_char) {
writeb(port->x_char, port->membase + VT8500_TXFIFO);
port->icount.tx++;
port->x_char = 0;
}
if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
vt8500_stop_tx(port);
return;
}
while ((vt8500_read(port, VT8500_URFIDX) & 0x1f) < 16) {
if (uart_circ_empty(xmit))
break;
writeb(xmit->buf[xmit->tail], port->membase + VT8500_TXFIFO);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
port->icount.tx++;
}
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
if (uart_circ_empty(xmit))
vt8500_stop_tx(port);
}
static void vt8500_start_tx(struct uart_port *port)
{
struct vt8500_port *vt8500_port = container_of(port,
struct vt8500_port,
uart);
vt8500_port->ier &= ~TX_FIFO_INTS;
vt8500_write(port, vt8500_port->ier, VT8500_URIER);
handle_tx(port);
vt8500_port->ier |= TX_FIFO_INTS;
vt8500_write(port, vt8500_port->ier, VT8500_URIER);
}
static void handle_delta_cts(struct uart_port *port)
{
port->icount.cts++;
wake_up_interruptible(&port->state->port.delta_msr_wait);
}
static irqreturn_t vt8500_irq(int irq, void *dev_id)
{
struct uart_port *port = dev_id;
unsigned long isr;
spin_lock(&port->lock);
isr = vt8500_read(port, VT8500_URISR);
/* Acknowledge active status bits */
vt8500_write(port, isr, VT8500_URISR);
if (isr & RX_FIFO_INTS)
handle_rx(port);
if (isr & TX_FIFO_INTS)
handle_tx(port);
if (isr & TCTS)
handle_delta_cts(port);
spin_unlock(&port->lock);
return IRQ_HANDLED;
}
static unsigned int vt8500_tx_empty(struct uart_port *port)
{
return (vt8500_read(port, VT8500_URFIDX) & 0x1f) < 16 ?
TIOCSER_TEMT : 0;
}
static unsigned int vt8500_get_mctrl(struct uart_port *port)
{
unsigned int usr;
usr = vt8500_read(port, VT8500_URUSR);
if (usr & (1 << 4))
return TIOCM_CTS;
else
return 0;
}
static void vt8500_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
unsigned int lcr = vt8500_read(port, VT8500_URLCR);
if (mctrl & TIOCM_RTS)
lcr |= VT8500_RTS;
else
lcr &= ~VT8500_RTS;
vt8500_write(port, lcr, VT8500_URLCR);
}
static void vt8500_break_ctl(struct uart_port *port, int break_ctl)
{
if (break_ctl)
vt8500_write(port,
vt8500_read(port, VT8500_URLCR) | VT8500_BREAK,
VT8500_URLCR);
}
static int vt8500_set_baud_rate(struct uart_port *port, unsigned int baud)
{
struct vt8500_port *vt8500_port =
container_of(port, struct vt8500_port, uart);
unsigned long div;
unsigned int loops = 1000;
div = ((vt8500_port->clk_predivisor - 1) & 0xf) << 16;
div |= (uart_get_divisor(port, baud) - 1) & 0x3ff;
/* Effective baud rate */
baud = port->uartclk / 16 / ((div & 0x3ff) + 1);
while ((vt8500_read(port, VT8500_URUSR) & (1 << 5)) && --loops)
cpu_relax();
vt8500_write(port, div, VT8500_URDIV);
/* Break signal timing depends on baud rate, update accordingly */
vt8500_write(port, mult_frac(baud, 4096, 1000000), VT8500_URBKR);
return baud;
}
static int vt8500_startup(struct uart_port *port)
{
struct vt8500_port *vt8500_port =
container_of(port, struct vt8500_port, uart);
int ret;
snprintf(vt8500_port->name, sizeof(vt8500_port->name),
"vt8500_serial%d", port->line);
ret = request_irq(port->irq, vt8500_irq, IRQF_TRIGGER_HIGH,
vt8500_port->name, port);
if (unlikely(ret))
return ret;
vt8500_write(port, 0x03, VT8500_URLCR); /* enable TX & RX */
return 0;
}
static void vt8500_shutdown(struct uart_port *port)
{
struct vt8500_port *vt8500_port =
container_of(port, struct vt8500_port, uart);
vt8500_port->ier = 0;
/* disable interrupts and FIFOs */
vt8500_write(&vt8500_port->uart, 0, VT8500_URIER);
vt8500_write(&vt8500_port->uart, 0x880, VT8500_URFCR);
free_irq(port->irq, port);
}
static void vt8500_set_termios(struct uart_port *port,
struct ktermios *termios,
struct ktermios *old)
{
struct vt8500_port *vt8500_port =
container_of(port, struct vt8500_port, uart);
unsigned long flags;
unsigned int baud, lcr;
unsigned int loops = 1000;
spin_lock_irqsave(&port->lock, flags);
/* calculate and set baud rate */
baud = uart_get_baud_rate(port, termios, old, 900, 921600);
baud = vt8500_set_baud_rate(port, baud);
if (tty_termios_baud_rate(termios))
tty_termios_encode_baud_rate(termios, baud, baud);
/* calculate parity */
lcr = vt8500_read(&vt8500_port->uart, VT8500_URLCR);
lcr &= ~(VT8500_PARENB | VT8500_PARODD);
if (termios->c_cflag & PARENB) {
lcr |= VT8500_PARENB;
termios->c_cflag &= ~CMSPAR;
if (termios->c_cflag & PARODD)
lcr |= VT8500_PARODD;
}
/* calculate bits per char */
lcr &= ~VT8500_CS8;
switch (termios->c_cflag & CSIZE) {
case CS7:
break;
case CS8:
default:
lcr |= VT8500_CS8;
termios->c_cflag &= ~CSIZE;
termios->c_cflag |= CS8;
break;
}
/* calculate stop bits */
lcr &= ~VT8500_CSTOPB;
if (termios->c_cflag & CSTOPB)
lcr |= VT8500_CSTOPB;
lcr &= ~VT8500_SWRTSCTS;
if (vt8500_port->vt8500_uart_flags & VT8500_HAS_SWRTSCTS_SWITCH)
lcr |= VT8500_SWRTSCTS;
/* set parity, bits per char, and stop bit */
vt8500_write(&vt8500_port->uart, lcr, VT8500_URLCR);
/* Configure status bits to ignore based on termio flags. */
port->read_status_mask = 0;
if (termios->c_iflag & IGNPAR)
port->read_status_mask = FER | PER;
uart_update_timeout(port, termios->c_cflag, baud);
/* Reset FIFOs */
vt8500_write(&vt8500_port->uart, 0x88c, VT8500_URFCR);
while ((vt8500_read(&vt8500_port->uart, VT8500_URFCR) & 0xc)
&& --loops)
cpu_relax();
/* Every possible FIFO-related interrupt */
vt8500_port->ier = RX_FIFO_INTS | TX_FIFO_INTS;
/*
* CTS flow control
*/
if (UART_ENABLE_MS(&vt8500_port->uart, termios->c_cflag))
vt8500_port->ier |= TCTS;
vt8500_write(&vt8500_port->uart, 0x881, VT8500_URFCR);
vt8500_write(&vt8500_port->uart, vt8500_port->ier, VT8500_URIER);
spin_unlock_irqrestore(&port->lock, flags);
}
static const char *vt8500_type(struct uart_port *port)
{
struct vt8500_port *vt8500_port =
container_of(port, struct vt8500_port, uart);
return vt8500_port->name;
}
static void vt8500_release_port(struct uart_port *port)
{
}
static int vt8500_request_port(struct uart_port *port)
{
return 0;
}
static void vt8500_config_port(struct uart_port *port, int flags)
{
port->type = PORT_VT8500;
}
static int vt8500_verify_port(struct uart_port *port,
struct serial_struct *ser)
{
if (unlikely(ser->type != PORT_UNKNOWN && ser->type != PORT_VT8500))
return -EINVAL;
if (unlikely(port->irq != ser->irq))
return -EINVAL;
return 0;
}
static struct vt8500_port *vt8500_uart_ports[VT8500_MAX_PORTS];
static struct uart_driver vt8500_uart_driver;
#ifdef CONFIG_SERIAL_VT8500_CONSOLE
static void wait_for_xmitr(struct uart_port *port)
{
unsigned int status, tmout = 10000;
/* Wait up to 10ms for the character(s) to be sent. */
do {
status = vt8500_read(port, VT8500_URFIDX);
if (--tmout == 0)
break;
udelay(1);
} while (status & 0x10);
}
static void vt8500_console_putchar(struct uart_port *port, int c)
{
wait_for_xmitr(port);
writeb(c, port->membase + VT8500_TXFIFO);
}
static void vt8500_console_write(struct console *co, const char *s,
unsigned int count)
{
struct vt8500_port *vt8500_port = vt8500_uart_ports[co->index];
unsigned long ier;
BUG_ON(co->index < 0 || co->index >= vt8500_uart_driver.nr);
ier = vt8500_read(&vt8500_port->uart, VT8500_URIER);
vt8500_write(&vt8500_port->uart, VT8500_URIER, 0);
uart_console_write(&vt8500_port->uart, s, count,
vt8500_console_putchar);
/*
* Finally, wait for transmitter to become empty
* and switch back to FIFO
*/
wait_for_xmitr(&vt8500_port->uart);
vt8500_write(&vt8500_port->uart, VT8500_URIER, ier);
}
static int __init vt8500_console_setup(struct console *co, char *options)
{
struct vt8500_port *vt8500_port;
int baud = 9600;
int bits = 8;
int parity = 'n';
int flow = 'n';
if (unlikely(co->index >= vt8500_uart_driver.nr || co->index < 0))
return -ENXIO;
vt8500_port = vt8500_uart_ports[co->index];
if (!vt8500_port)
return -ENODEV;
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
return uart_set_options(&vt8500_port->uart,
co, baud, parity, bits, flow);
}
static struct console vt8500_console = {
.name = "ttyWMT",
.write = vt8500_console_write,
.device = uart_console_device,
.setup = vt8500_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &vt8500_uart_driver,
};
#define VT8500_CONSOLE (&vt8500_console)
#else
#define VT8500_CONSOLE NULL
#endif
#ifdef CONFIG_CONSOLE_POLL
static int vt8500_get_poll_char(struct uart_port *port)
{
unsigned int status = vt8500_read(port, VT8500_URFIDX);
if (!(status & 0x1f00))
return NO_POLL_CHAR;
return vt8500_read(port, VT8500_RXFIFO) & 0xff;
}
static void vt8500_put_poll_char(struct uart_port *port, unsigned char c)
{
unsigned int status, tmout = 10000;
do {
status = vt8500_read(port, VT8500_URFIDX);
if (--tmout == 0)
break;
udelay(1);
} while (status & 0x10);
vt8500_write(port, c, VT8500_TXFIFO);
}
#endif
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>
2017-01-26 00:48:52 +07:00
static const struct uart_ops vt8500_uart_pops = {
.tx_empty = vt8500_tx_empty,
.set_mctrl = vt8500_set_mctrl,
.get_mctrl = vt8500_get_mctrl,
.stop_tx = vt8500_stop_tx,
.start_tx = vt8500_start_tx,
.stop_rx = vt8500_stop_rx,
.enable_ms = vt8500_enable_ms,
.break_ctl = vt8500_break_ctl,
.startup = vt8500_startup,
.shutdown = vt8500_shutdown,
.set_termios = vt8500_set_termios,
.type = vt8500_type,
.release_port = vt8500_release_port,
.request_port = vt8500_request_port,
.config_port = vt8500_config_port,
.verify_port = vt8500_verify_port,
#ifdef CONFIG_CONSOLE_POLL
.poll_get_char = vt8500_get_poll_char,
.poll_put_char = vt8500_put_poll_char,
#endif
};
static struct uart_driver vt8500_uart_driver = {
.owner = THIS_MODULE,
.driver_name = "vt8500_serial",
.dev_name = "ttyWMT",
.nr = 6,
.cons = VT8500_CONSOLE,
};
static unsigned int vt8500_flags; /* none required so far */
static unsigned int wm8880_flags = VT8500_HAS_SWRTSCTS_SWITCH;
static const struct of_device_id wmt_dt_ids[] = {
{ .compatible = "via,vt8500-uart", .data = &vt8500_flags},
{ .compatible = "wm,wm8880-uart", .data = &wm8880_flags},
{}
};
static int vt8500_serial_probe(struct platform_device *pdev)
{
struct vt8500_port *vt8500_port;
struct resource *mmres, *irqres;
struct device_node *np = pdev->dev.of_node;
const struct of_device_id *match;
const unsigned int *flags;
int ret;
int port;
match = of_match_device(wmt_dt_ids, &pdev->dev);
if (!match)
return -EINVAL;
flags = match->data;
mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
irqres = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (!mmres || !irqres)
return -ENODEV;
if (np) {
port = of_alias_get_id(np, "serial");
if (port >= VT8500_MAX_PORTS)
port = -1;
} else {
port = -1;
}
if (port < 0) {
/* calculate the port id */
port = find_first_zero_bit(vt8500_ports_in_use,
VT8500_MAX_PORTS);
}
if (port >= VT8500_MAX_PORTS)
return -ENODEV;
/* reserve the port id */
if (test_and_set_bit(port, vt8500_ports_in_use)) {
/* port already in use - shouldn't really happen */
return -EBUSY;
}
vt8500_port = devm_kzalloc(&pdev->dev, sizeof(struct vt8500_port),
GFP_KERNEL);
if (!vt8500_port)
return -ENOMEM;
vt8500_port->uart.membase = devm_ioremap_resource(&pdev->dev, mmres);
if (IS_ERR(vt8500_port->uart.membase))
return PTR_ERR(vt8500_port->uart.membase);
vt8500_port->clk = of_clk_get(pdev->dev.of_node, 0);
if (IS_ERR(vt8500_port->clk)) {
dev_err(&pdev->dev, "failed to get clock\n");
return -EINVAL;
}
ret = clk_prepare_enable(vt8500_port->clk);
if (ret) {
dev_err(&pdev->dev, "failed to enable clock\n");
return ret;
}
vt8500_port->vt8500_uart_flags = *flags;
vt8500_port->clk_predivisor = DIV_ROUND_CLOSEST(
clk_get_rate(vt8500_port->clk),
VT8500_RECOMMENDED_CLK
);
vt8500_port->uart.type = PORT_VT8500;
vt8500_port->uart.iotype = UPIO_MEM;
vt8500_port->uart.mapbase = mmres->start;
vt8500_port->uart.irq = irqres->start;
vt8500_port->uart.fifosize = 16;
vt8500_port->uart.ops = &vt8500_uart_pops;
vt8500_port->uart.line = port;
vt8500_port->uart.dev = &pdev->dev;
vt8500_port->uart.flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
/* Serial core uses the magic "16" everywhere - adjust for it */
vt8500_port->uart.uartclk = 16 * clk_get_rate(vt8500_port->clk) /
vt8500_port->clk_predivisor /
VT8500_OVERSAMPLING_DIVISOR;
snprintf(vt8500_port->name, sizeof(vt8500_port->name),
"VT8500 UART%d", pdev->id);
vt8500_uart_ports[port] = vt8500_port;
uart_add_one_port(&vt8500_uart_driver, &vt8500_port->uart);
platform_set_drvdata(pdev, vt8500_port);
return 0;
}
static struct platform_driver vt8500_platform_driver = {
.probe = vt8500_serial_probe,
.driver = {
.name = "vt8500_serial",
.of_match_table = wmt_dt_ids,
.suppress_bind_attrs = true,
},
};
static int __init vt8500_serial_init(void)
{
int ret;
ret = uart_register_driver(&vt8500_uart_driver);
if (unlikely(ret))
return ret;
ret = platform_driver_register(&vt8500_platform_driver);
if (unlikely(ret))
uart_unregister_driver(&vt8500_uart_driver);
return ret;
}
device_initcall(vt8500_serial_init);