OpenCloudOS-Kernel/drivers/tty/serial/lpc32xx_hs.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 01:11:51 +08:00
// SPDX-License-Identifier: GPL-2.0+
/*
* High Speed Serial Ports on NXP LPC32xx SoC
*
* Authors: Kevin Wells <kevin.wells@nxp.com>
* Roland Stigge <stigge@antcom.de>
*
* Copyright (C) 2010 NXP Semiconductors
* Copyright (C) 2012 Roland Stigge
*/
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/sysrq.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial_core.h>
#include <linux/serial.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/nmi.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <linux/of.h>
#include <mach/platform.h>
#include <mach/hardware.h>
/*
* High Speed UART register offsets
*/
#define LPC32XX_HSUART_FIFO(x) ((x) + 0x00)
#define LPC32XX_HSUART_LEVEL(x) ((x) + 0x04)
#define LPC32XX_HSUART_IIR(x) ((x) + 0x08)
#define LPC32XX_HSUART_CTRL(x) ((x) + 0x0C)
#define LPC32XX_HSUART_RATE(x) ((x) + 0x10)
#define LPC32XX_HSU_BREAK_DATA (1 << 10)
#define LPC32XX_HSU_ERROR_DATA (1 << 9)
#define LPC32XX_HSU_RX_EMPTY (1 << 8)
#define LPC32XX_HSU_TX_LEV(n) (((n) >> 8) & 0xFF)
#define LPC32XX_HSU_RX_LEV(n) ((n) & 0xFF)
#define LPC32XX_HSU_TX_INT_SET (1 << 6)
#define LPC32XX_HSU_RX_OE_INT (1 << 5)
#define LPC32XX_HSU_BRK_INT (1 << 4)
#define LPC32XX_HSU_FE_INT (1 << 3)
#define LPC32XX_HSU_RX_TIMEOUT_INT (1 << 2)
#define LPC32XX_HSU_RX_TRIG_INT (1 << 1)
#define LPC32XX_HSU_TX_INT (1 << 0)
#define LPC32XX_HSU_HRTS_INV (1 << 21)
#define LPC32XX_HSU_HRTS_TRIG_8B (0x0 << 19)
#define LPC32XX_HSU_HRTS_TRIG_16B (0x1 << 19)
#define LPC32XX_HSU_HRTS_TRIG_32B (0x2 << 19)
#define LPC32XX_HSU_HRTS_TRIG_48B (0x3 << 19)
#define LPC32XX_HSU_HRTS_EN (1 << 18)
#define LPC32XX_HSU_TMO_DISABLED (0x0 << 16)
#define LPC32XX_HSU_TMO_INACT_4B (0x1 << 16)
#define LPC32XX_HSU_TMO_INACT_8B (0x2 << 16)
#define LPC32XX_HSU_TMO_INACT_16B (0x3 << 16)
#define LPC32XX_HSU_HCTS_INV (1 << 15)
#define LPC32XX_HSU_HCTS_EN (1 << 14)
#define LPC32XX_HSU_OFFSET(n) ((n) << 9)
#define LPC32XX_HSU_BREAK (1 << 8)
#define LPC32XX_HSU_ERR_INT_EN (1 << 7)
#define LPC32XX_HSU_RX_INT_EN (1 << 6)
#define LPC32XX_HSU_TX_INT_EN (1 << 5)
#define LPC32XX_HSU_RX_TL1B (0x0 << 2)
#define LPC32XX_HSU_RX_TL4B (0x1 << 2)
#define LPC32XX_HSU_RX_TL8B (0x2 << 2)
#define LPC32XX_HSU_RX_TL16B (0x3 << 2)
#define LPC32XX_HSU_RX_TL32B (0x4 << 2)
#define LPC32XX_HSU_RX_TL48B (0x5 << 2)
#define LPC32XX_HSU_TX_TLEMPTY (0x0 << 0)
#define LPC32XX_HSU_TX_TL0B (0x0 << 0)
#define LPC32XX_HSU_TX_TL4B (0x1 << 0)
#define LPC32XX_HSU_TX_TL8B (0x2 << 0)
#define LPC32XX_HSU_TX_TL16B (0x3 << 0)
#define MODNAME "lpc32xx_hsuart"
struct lpc32xx_hsuart_port {
struct uart_port port;
};
#define FIFO_READ_LIMIT 128
#define MAX_PORTS 3
#define LPC32XX_TTY_NAME "ttyTX"
static struct lpc32xx_hsuart_port lpc32xx_hs_ports[MAX_PORTS];
#ifdef CONFIG_SERIAL_HS_LPC32XX_CONSOLE
static void wait_for_xmit_empty(struct uart_port *port)
{
unsigned int timeout = 10000;
do {
if (LPC32XX_HSU_TX_LEV(readl(LPC32XX_HSUART_LEVEL(
port->membase))) == 0)
break;
if (--timeout == 0)
break;
udelay(1);
} while (1);
}
static void wait_for_xmit_ready(struct uart_port *port)
{
unsigned int timeout = 10000;
while (1) {
if (LPC32XX_HSU_TX_LEV(readl(LPC32XX_HSUART_LEVEL(
port->membase))) < 32)
break;
if (--timeout == 0)
break;
udelay(1);
}
}
static void lpc32xx_hsuart_console_putchar(struct uart_port *port, int ch)
{
wait_for_xmit_ready(port);
writel((u32)ch, LPC32XX_HSUART_FIFO(port->membase));
}
static void lpc32xx_hsuart_console_write(struct console *co, const char *s,
unsigned int count)
{
struct lpc32xx_hsuart_port *up = &lpc32xx_hs_ports[co->index];
unsigned long flags;
int locked = 1;
touch_nmi_watchdog();
local_irq_save(flags);
if (up->port.sysrq)
locked = 0;
else if (oops_in_progress)
locked = spin_trylock(&up->port.lock);
else
spin_lock(&up->port.lock);
uart_console_write(&up->port, s, count, lpc32xx_hsuart_console_putchar);
wait_for_xmit_empty(&up->port);
if (locked)
spin_unlock(&up->port.lock);
local_irq_restore(flags);
}
static int __init lpc32xx_hsuart_console_setup(struct console *co,
char *options)
{
struct uart_port *port;
int baud = 115200;
int bits = 8;
int parity = 'n';
int flow = 'n';
if (co->index >= MAX_PORTS)
co->index = 0;
port = &lpc32xx_hs_ports[co->index].port;
if (!port->membase)
return -ENODEV;
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
return uart_set_options(port, co, baud, parity, bits, flow);
}
static struct uart_driver lpc32xx_hsuart_reg;
static struct console lpc32xx_hsuart_console = {
.name = LPC32XX_TTY_NAME,
.write = lpc32xx_hsuart_console_write,
.device = uart_console_device,
.setup = lpc32xx_hsuart_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &lpc32xx_hsuart_reg,
};
static int __init lpc32xx_hsuart_console_init(void)
{
register_console(&lpc32xx_hsuart_console);
return 0;
}
console_initcall(lpc32xx_hsuart_console_init);
#define LPC32XX_HSUART_CONSOLE (&lpc32xx_hsuart_console)
#else
#define LPC32XX_HSUART_CONSOLE NULL
#endif
static struct uart_driver lpc32xx_hs_reg = {
.owner = THIS_MODULE,
.driver_name = MODNAME,
.dev_name = LPC32XX_TTY_NAME,
.nr = MAX_PORTS,
.cons = LPC32XX_HSUART_CONSOLE,
};
static int uarts_registered;
static unsigned int __serial_get_clock_div(unsigned long uartclk,
unsigned long rate)
{
u32 div, goodrate, hsu_rate, l_hsu_rate, comprate;
u32 rate_diff;
/* Find the closest divider to get the desired clock rate */
div = uartclk / rate;
goodrate = hsu_rate = (div / 14) - 1;
if (hsu_rate != 0)
hsu_rate--;
/* Tweak divider */
l_hsu_rate = hsu_rate + 3;
rate_diff = 0xFFFFFFFF;
while (hsu_rate < l_hsu_rate) {
comprate = uartclk / ((hsu_rate + 1) * 14);
if (abs(comprate - rate) < rate_diff) {
goodrate = hsu_rate;
rate_diff = abs(comprate - rate);
}
hsu_rate++;
}
if (hsu_rate > 0xFF)
hsu_rate = 0xFF;
return goodrate;
}
static void __serial_uart_flush(struct uart_port *port)
{
u32 tmp;
int cnt = 0;
while ((readl(LPC32XX_HSUART_LEVEL(port->membase)) > 0) &&
(cnt++ < FIFO_READ_LIMIT))
tmp = readl(LPC32XX_HSUART_FIFO(port->membase));
}
static void __serial_lpc32xx_rx(struct uart_port *port)
{
struct tty_port *tport = &port->state->port;
unsigned int tmp, flag;
/* Read data from FIFO and push into terminal */
tmp = readl(LPC32XX_HSUART_FIFO(port->membase));
while (!(tmp & LPC32XX_HSU_RX_EMPTY)) {
flag = TTY_NORMAL;
port->icount.rx++;
if (tmp & LPC32XX_HSU_ERROR_DATA) {
/* Framing error */
writel(LPC32XX_HSU_FE_INT,
LPC32XX_HSUART_IIR(port->membase));
port->icount.frame++;
flag = TTY_FRAME;
tty_insert_flip_char(tport, 0, TTY_FRAME);
}
tty_insert_flip_char(tport, (tmp & 0xFF), flag);
tmp = readl(LPC32XX_HSUART_FIFO(port->membase));
}
tty: serial: lpc32xx_hs: 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 Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-08-19 22:44:15 +08:00
spin_unlock(&port->lock);
tty_flip_buffer_push(tport);
tty: serial: lpc32xx_hs: 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 Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-08-19 22:44:15 +08:00
spin_lock(&port->lock);
}
static void __serial_lpc32xx_tx(struct uart_port *port)
{
struct circ_buf *xmit = &port->state->xmit;
unsigned int tmp;
if (port->x_char) {
writel((u32)port->x_char, LPC32XX_HSUART_FIFO(port->membase));
port->icount.tx++;
port->x_char = 0;
return;
}
if (uart_circ_empty(xmit) || uart_tx_stopped(port))
goto exit_tx;
/* Transfer data */
while (LPC32XX_HSU_TX_LEV(readl(
LPC32XX_HSUART_LEVEL(port->membase))) < 64) {
writel((u32) xmit->buf[xmit->tail],
LPC32XX_HSUART_FIFO(port->membase));
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
port->icount.tx++;
if (uart_circ_empty(xmit))
break;
}
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
exit_tx:
if (uart_circ_empty(xmit)) {
tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
tmp &= ~LPC32XX_HSU_TX_INT_EN;
writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
}
}
static irqreturn_t serial_lpc32xx_interrupt(int irq, void *dev_id)
{
struct uart_port *port = dev_id;
struct tty_port *tport = &port->state->port;
u32 status;
spin_lock(&port->lock);
/* Read UART status and clear latched interrupts */
status = readl(LPC32XX_HSUART_IIR(port->membase));
if (status & LPC32XX_HSU_BRK_INT) {
/* Break received */
writel(LPC32XX_HSU_BRK_INT, LPC32XX_HSUART_IIR(port->membase));
port->icount.brk++;
uart_handle_break(port);
}
/* Framing error */
if (status & LPC32XX_HSU_FE_INT)
writel(LPC32XX_HSU_FE_INT, LPC32XX_HSUART_IIR(port->membase));
if (status & LPC32XX_HSU_RX_OE_INT) {
/* Receive FIFO overrun */
writel(LPC32XX_HSU_RX_OE_INT,
LPC32XX_HSUART_IIR(port->membase));
port->icount.overrun++;
tty_insert_flip_char(tport, 0, TTY_OVERRUN);
tty_schedule_flip(tport);
}
/* Data received? */
if (status & (LPC32XX_HSU_RX_TIMEOUT_INT | LPC32XX_HSU_RX_TRIG_INT))
__serial_lpc32xx_rx(port);
/* Transmit data request? */
if ((status & LPC32XX_HSU_TX_INT) && (!uart_tx_stopped(port))) {
writel(LPC32XX_HSU_TX_INT, LPC32XX_HSUART_IIR(port->membase));
__serial_lpc32xx_tx(port);
}
spin_unlock(&port->lock);
return IRQ_HANDLED;
}
/* port->lock is not held. */
static unsigned int serial_lpc32xx_tx_empty(struct uart_port *port)
{
unsigned int ret = 0;
if (LPC32XX_HSU_TX_LEV(readl(LPC32XX_HSUART_LEVEL(port->membase))) == 0)
ret = TIOCSER_TEMT;
return ret;
}
/* port->lock held by caller. */
static void serial_lpc32xx_set_mctrl(struct uart_port *port,
unsigned int mctrl)
{
/* No signals are supported on HS UARTs */
}
/* port->lock is held by caller and interrupts are disabled. */
static unsigned int serial_lpc32xx_get_mctrl(struct uart_port *port)
{
/* No signals are supported on HS UARTs */
return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
}
/* port->lock held by caller. */
static void serial_lpc32xx_stop_tx(struct uart_port *port)
{
u32 tmp;
tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
tmp &= ~LPC32XX_HSU_TX_INT_EN;
writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
}
/* port->lock held by caller. */
static void serial_lpc32xx_start_tx(struct uart_port *port)
{
u32 tmp;
__serial_lpc32xx_tx(port);
tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
tmp |= LPC32XX_HSU_TX_INT_EN;
writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
}
/* port->lock held by caller. */
static void serial_lpc32xx_stop_rx(struct uart_port *port)
{
u32 tmp;
tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
tmp &= ~(LPC32XX_HSU_RX_INT_EN | LPC32XX_HSU_ERR_INT_EN);
writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
writel((LPC32XX_HSU_BRK_INT | LPC32XX_HSU_RX_OE_INT |
LPC32XX_HSU_FE_INT), LPC32XX_HSUART_IIR(port->membase));
}
/* port->lock is not held. */
static void serial_lpc32xx_break_ctl(struct uart_port *port,
int break_state)
{
unsigned long flags;
u32 tmp;
spin_lock_irqsave(&port->lock, flags);
tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
if (break_state != 0)
tmp |= LPC32XX_HSU_BREAK;
else
tmp &= ~LPC32XX_HSU_BREAK;
writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
spin_unlock_irqrestore(&port->lock, flags);
}
/* LPC3250 Errata HSUART.1: Hang workaround via loopback mode on inactivity */
static void lpc32xx_loopback_set(resource_size_t mapbase, int state)
{
int bit;
u32 tmp;
switch (mapbase) {
case LPC32XX_HS_UART1_BASE:
bit = 0;
break;
case LPC32XX_HS_UART2_BASE:
bit = 1;
break;
case LPC32XX_HS_UART7_BASE:
bit = 6;
break;
default:
WARN(1, "lpc32xx_hs: Warning: Unknown port at %08x\n", mapbase);
return;
}
tmp = readl(LPC32XX_UARTCTL_CLOOP);
if (state)
tmp |= (1 << bit);
else
tmp &= ~(1 << bit);
writel(tmp, LPC32XX_UARTCTL_CLOOP);
}
/* port->lock is not held. */
static int serial_lpc32xx_startup(struct uart_port *port)
{
int retval;
unsigned long flags;
u32 tmp;
spin_lock_irqsave(&port->lock, flags);
__serial_uart_flush(port);
writel((LPC32XX_HSU_TX_INT | LPC32XX_HSU_FE_INT |
LPC32XX_HSU_BRK_INT | LPC32XX_HSU_RX_OE_INT),
LPC32XX_HSUART_IIR(port->membase));
writel(0xFF, LPC32XX_HSUART_RATE(port->membase));
/*
* Set receiver timeout, HSU offset of 20, no break, no interrupts,
* and default FIFO trigger levels
*/
tmp = LPC32XX_HSU_TX_TL8B | LPC32XX_HSU_RX_TL32B |
LPC32XX_HSU_OFFSET(20) | LPC32XX_HSU_TMO_INACT_4B;
writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
lpc32xx_loopback_set(port->mapbase, 0); /* get out of loopback mode */
spin_unlock_irqrestore(&port->lock, flags);
retval = request_irq(port->irq, serial_lpc32xx_interrupt,
0, MODNAME, port);
if (!retval)
writel((tmp | LPC32XX_HSU_RX_INT_EN | LPC32XX_HSU_ERR_INT_EN),
LPC32XX_HSUART_CTRL(port->membase));
return retval;
}
/* port->lock is not held. */
static void serial_lpc32xx_shutdown(struct uart_port *port)
{
u32 tmp;
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
tmp = LPC32XX_HSU_TX_TL8B | LPC32XX_HSU_RX_TL32B |
LPC32XX_HSU_OFFSET(20) | LPC32XX_HSU_TMO_INACT_4B;
writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
lpc32xx_loopback_set(port->mapbase, 1); /* go to loopback mode */
spin_unlock_irqrestore(&port->lock, flags);
free_irq(port->irq, port);
}
/* port->lock is not held. */
static void serial_lpc32xx_set_termios(struct uart_port *port,
struct ktermios *termios,
struct ktermios *old)
{
unsigned long flags;
unsigned int baud, quot;
u32 tmp;
/* Always 8-bit, no parity, 1 stop bit */
termios->c_cflag &= ~(CSIZE | CSTOPB | PARENB | PARODD);
termios->c_cflag |= CS8;
termios->c_cflag &= ~(HUPCL | CMSPAR | CLOCAL | CRTSCTS);
baud = uart_get_baud_rate(port, termios, old, 0,
port->uartclk / 14);
quot = __serial_get_clock_div(port->uartclk, baud);
spin_lock_irqsave(&port->lock, flags);
/* Ignore characters? */
tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
if ((termios->c_cflag & CREAD) == 0)
tmp &= ~(LPC32XX_HSU_RX_INT_EN | LPC32XX_HSU_ERR_INT_EN);
else
tmp |= LPC32XX_HSU_RX_INT_EN | LPC32XX_HSU_ERR_INT_EN;
writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
writel(quot, LPC32XX_HSUART_RATE(port->membase));
uart_update_timeout(port, termios->c_cflag, baud);
spin_unlock_irqrestore(&port->lock, flags);
/* Don't rewrite B0 */
if (tty_termios_baud_rate(termios))
tty_termios_encode_baud_rate(termios, baud, baud);
}
static const char *serial_lpc32xx_type(struct uart_port *port)
{
return MODNAME;
}
static void serial_lpc32xx_release_port(struct uart_port *port)
{
if ((port->iotype == UPIO_MEM32) && (port->mapbase)) {
if (port->flags & UPF_IOREMAP) {
iounmap(port->membase);
port->membase = NULL;
}
release_mem_region(port->mapbase, SZ_4K);
}
}
static int serial_lpc32xx_request_port(struct uart_port *port)
{
int ret = -ENODEV;
if ((port->iotype == UPIO_MEM32) && (port->mapbase)) {
ret = 0;
if (!request_mem_region(port->mapbase, SZ_4K, MODNAME))
ret = -EBUSY;
else if (port->flags & UPF_IOREMAP) {
port->membase = ioremap(port->mapbase, SZ_4K);
if (!port->membase) {
release_mem_region(port->mapbase, SZ_4K);
ret = -ENOMEM;
}
}
}
return ret;
}
static void serial_lpc32xx_config_port(struct uart_port *port, int uflags)
{
int ret;
ret = serial_lpc32xx_request_port(port);
if (ret < 0)
return;
port->type = PORT_UART00;
port->fifosize = 64;
__serial_uart_flush(port);
writel((LPC32XX_HSU_TX_INT | LPC32XX_HSU_FE_INT |
LPC32XX_HSU_BRK_INT | LPC32XX_HSU_RX_OE_INT),
LPC32XX_HSUART_IIR(port->membase));
writel(0xFF, LPC32XX_HSUART_RATE(port->membase));
/* Set receiver timeout, HSU offset of 20, no break, no interrupts,
and default FIFO trigger levels */
writel(LPC32XX_HSU_TX_TL8B | LPC32XX_HSU_RX_TL32B |
LPC32XX_HSU_OFFSET(20) | LPC32XX_HSU_TMO_INACT_4B,
LPC32XX_HSUART_CTRL(port->membase));
}
static int serial_lpc32xx_verify_port(struct uart_port *port,
struct serial_struct *ser)
{
int ret = 0;
if (ser->type != PORT_UART00)
ret = -EINVAL;
return ret;
}
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 01:48:52 +08:00
static const struct uart_ops serial_lpc32xx_pops = {
.tx_empty = serial_lpc32xx_tx_empty,
.set_mctrl = serial_lpc32xx_set_mctrl,
.get_mctrl = serial_lpc32xx_get_mctrl,
.stop_tx = serial_lpc32xx_stop_tx,
.start_tx = serial_lpc32xx_start_tx,
.stop_rx = serial_lpc32xx_stop_rx,
.break_ctl = serial_lpc32xx_break_ctl,
.startup = serial_lpc32xx_startup,
.shutdown = serial_lpc32xx_shutdown,
.set_termios = serial_lpc32xx_set_termios,
.type = serial_lpc32xx_type,
.release_port = serial_lpc32xx_release_port,
.request_port = serial_lpc32xx_request_port,
.config_port = serial_lpc32xx_config_port,
.verify_port = serial_lpc32xx_verify_port,
};
/*
* Register a set of serial devices attached to a platform device
*/
static int serial_hs_lpc32xx_probe(struct platform_device *pdev)
{
struct lpc32xx_hsuart_port *p = &lpc32xx_hs_ports[uarts_registered];
int ret = 0;
struct resource *res;
if (uarts_registered >= MAX_PORTS) {
dev_err(&pdev->dev,
"Error: Number of possible ports exceeded (%d)!\n",
uarts_registered + 1);
return -ENXIO;
}
memset(p, 0, sizeof(*p));
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev,
"Error getting mem resource for HS UART port %d\n",
uarts_registered);
return -ENXIO;
}
p->port.mapbase = res->start;
p->port.membase = NULL;
ret = platform_get_irq(pdev, 0);
if (ret < 0) {
dev_err(&pdev->dev, "Error getting irq for HS UART port %d\n",
uarts_registered);
return ret;
}
p->port.irq = ret;
p->port.iotype = UPIO_MEM32;
p->port.uartclk = LPC32XX_MAIN_OSC_FREQ;
p->port.regshift = 2;
p->port.flags = UPF_BOOT_AUTOCONF | UPF_FIXED_PORT | UPF_IOREMAP;
p->port.dev = &pdev->dev;
p->port.ops = &serial_lpc32xx_pops;
p->port.line = uarts_registered++;
spin_lock_init(&p->port.lock);
/* send port to loopback mode by default */
lpc32xx_loopback_set(p->port.mapbase, 1);
ret = uart_add_one_port(&lpc32xx_hs_reg, &p->port);
platform_set_drvdata(pdev, p);
return ret;
}
/*
* Remove serial ports registered against a platform device.
*/
static int serial_hs_lpc32xx_remove(struct platform_device *pdev)
{
struct lpc32xx_hsuart_port *p = platform_get_drvdata(pdev);
uart_remove_one_port(&lpc32xx_hs_reg, &p->port);
return 0;
}
#ifdef CONFIG_PM
static int serial_hs_lpc32xx_suspend(struct platform_device *pdev,
pm_message_t state)
{
struct lpc32xx_hsuart_port *p = platform_get_drvdata(pdev);
uart_suspend_port(&lpc32xx_hs_reg, &p->port);
return 0;
}
static int serial_hs_lpc32xx_resume(struct platform_device *pdev)
{
struct lpc32xx_hsuart_port *p = platform_get_drvdata(pdev);
uart_resume_port(&lpc32xx_hs_reg, &p->port);
return 0;
}
#else
#define serial_hs_lpc32xx_suspend NULL
#define serial_hs_lpc32xx_resume NULL
#endif
static const struct of_device_id serial_hs_lpc32xx_dt_ids[] = {
{ .compatible = "nxp,lpc3220-hsuart" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, serial_hs_lpc32xx_dt_ids);
static struct platform_driver serial_hs_lpc32xx_driver = {
.probe = serial_hs_lpc32xx_probe,
.remove = serial_hs_lpc32xx_remove,
.suspend = serial_hs_lpc32xx_suspend,
.resume = serial_hs_lpc32xx_resume,
.driver = {
.name = MODNAME,
.of_match_table = serial_hs_lpc32xx_dt_ids,
},
};
static int __init lpc32xx_hsuart_init(void)
{
int ret;
ret = uart_register_driver(&lpc32xx_hs_reg);
if (ret)
return ret;
ret = platform_driver_register(&serial_hs_lpc32xx_driver);
if (ret)
uart_unregister_driver(&lpc32xx_hs_reg);
return ret;
}
static void __exit lpc32xx_hsuart_exit(void)
{
platform_driver_unregister(&serial_hs_lpc32xx_driver);
uart_unregister_driver(&lpc32xx_hs_reg);
}
module_init(lpc32xx_hsuart_init);
module_exit(lpc32xx_hsuart_exit);
MODULE_AUTHOR("Kevin Wells <kevin.wells@nxp.com>");
MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
MODULE_DESCRIPTION("NXP LPC32XX High Speed UART driver");
MODULE_LICENSE("GPL");