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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
Now that the SPDX tag is in all tty files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. Cc: Jiri Slaby <jslaby@suse.com> 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: 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: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> 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: Chris Metcalf <cmetcalf@mellanox.com> 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
783 lines
18 KiB
C
783 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Atheros AR933X SoC built-in UART driver
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*
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* Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
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*
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* Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
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*/
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#include <linux/module.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <linux/console.h>
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#include <linux/sysrq.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/serial_core.h>
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#include <linux/serial.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/clk.h>
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#include <asm/div64.h>
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#include <asm/mach-ath79/ar933x_uart.h>
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#define DRIVER_NAME "ar933x-uart"
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#define AR933X_UART_MAX_SCALE 0xff
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#define AR933X_UART_MAX_STEP 0xffff
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#define AR933X_UART_MIN_BAUD 300
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#define AR933X_UART_MAX_BAUD 3000000
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#define AR933X_DUMMY_STATUS_RD 0x01
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static struct uart_driver ar933x_uart_driver;
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struct ar933x_uart_port {
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struct uart_port port;
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unsigned int ier; /* shadow Interrupt Enable Register */
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unsigned int min_baud;
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unsigned int max_baud;
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struct clk *clk;
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};
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static inline bool ar933x_uart_console_enabled(void)
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{
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return IS_ENABLED(CONFIG_SERIAL_AR933X_CONSOLE);
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}
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static inline unsigned int ar933x_uart_read(struct ar933x_uart_port *up,
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int offset)
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{
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return readl(up->port.membase + offset);
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}
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static inline void ar933x_uart_write(struct ar933x_uart_port *up,
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int offset, unsigned int value)
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{
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writel(value, up->port.membase + offset);
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}
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static inline void ar933x_uart_rmw(struct ar933x_uart_port *up,
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unsigned int offset,
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unsigned int mask,
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unsigned int val)
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{
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unsigned int t;
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t = ar933x_uart_read(up, offset);
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t &= ~mask;
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t |= val;
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ar933x_uart_write(up, offset, t);
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}
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static inline void ar933x_uart_rmw_set(struct ar933x_uart_port *up,
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unsigned int offset,
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unsigned int val)
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{
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ar933x_uart_rmw(up, offset, 0, val);
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}
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static inline void ar933x_uart_rmw_clear(struct ar933x_uart_port *up,
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unsigned int offset,
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unsigned int val)
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{
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ar933x_uart_rmw(up, offset, val, 0);
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}
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static inline void ar933x_uart_start_tx_interrupt(struct ar933x_uart_port *up)
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{
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up->ier |= AR933X_UART_INT_TX_EMPTY;
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ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier);
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}
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static inline void ar933x_uart_stop_tx_interrupt(struct ar933x_uart_port *up)
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{
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up->ier &= ~AR933X_UART_INT_TX_EMPTY;
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ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier);
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}
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static inline void ar933x_uart_putc(struct ar933x_uart_port *up, int ch)
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{
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unsigned int rdata;
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rdata = ch & AR933X_UART_DATA_TX_RX_MASK;
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rdata |= AR933X_UART_DATA_TX_CSR;
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ar933x_uart_write(up, AR933X_UART_DATA_REG, rdata);
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}
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static unsigned int ar933x_uart_tx_empty(struct uart_port *port)
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{
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struct ar933x_uart_port *up =
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container_of(port, struct ar933x_uart_port, port);
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unsigned long flags;
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unsigned int rdata;
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spin_lock_irqsave(&up->port.lock, flags);
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rdata = ar933x_uart_read(up, AR933X_UART_DATA_REG);
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spin_unlock_irqrestore(&up->port.lock, flags);
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return (rdata & AR933X_UART_DATA_TX_CSR) ? 0 : TIOCSER_TEMT;
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}
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static unsigned int ar933x_uart_get_mctrl(struct uart_port *port)
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{
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return TIOCM_CAR;
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}
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static void ar933x_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
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{
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}
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static void ar933x_uart_start_tx(struct uart_port *port)
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{
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struct ar933x_uart_port *up =
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container_of(port, struct ar933x_uart_port, port);
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ar933x_uart_start_tx_interrupt(up);
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}
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static void ar933x_uart_stop_tx(struct uart_port *port)
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{
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struct ar933x_uart_port *up =
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container_of(port, struct ar933x_uart_port, port);
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ar933x_uart_stop_tx_interrupt(up);
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}
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static void ar933x_uart_stop_rx(struct uart_port *port)
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{
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struct ar933x_uart_port *up =
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container_of(port, struct ar933x_uart_port, port);
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up->ier &= ~AR933X_UART_INT_RX_VALID;
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ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier);
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}
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static void ar933x_uart_break_ctl(struct uart_port *port, int break_state)
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{
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struct ar933x_uart_port *up =
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container_of(port, struct ar933x_uart_port, port);
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unsigned long flags;
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spin_lock_irqsave(&up->port.lock, flags);
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if (break_state == -1)
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ar933x_uart_rmw_set(up, AR933X_UART_CS_REG,
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AR933X_UART_CS_TX_BREAK);
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else
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ar933x_uart_rmw_clear(up, AR933X_UART_CS_REG,
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AR933X_UART_CS_TX_BREAK);
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spin_unlock_irqrestore(&up->port.lock, flags);
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}
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/*
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* baudrate = (clk / (scale + 1)) * (step * (1 / 2^17))
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*/
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static unsigned long ar933x_uart_get_baud(unsigned int clk,
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unsigned int scale,
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unsigned int step)
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{
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u64 t;
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u32 div;
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div = (2 << 16) * (scale + 1);
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t = clk;
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t *= step;
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t += (div / 2);
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do_div(t, div);
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return t;
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}
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static void ar933x_uart_get_scale_step(unsigned int clk,
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unsigned int baud,
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unsigned int *scale,
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unsigned int *step)
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{
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unsigned int tscale;
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long min_diff;
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*scale = 0;
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*step = 0;
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min_diff = baud;
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for (tscale = 0; tscale < AR933X_UART_MAX_SCALE; tscale++) {
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u64 tstep;
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int diff;
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tstep = baud * (tscale + 1);
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tstep *= (2 << 16);
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do_div(tstep, clk);
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if (tstep > AR933X_UART_MAX_STEP)
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break;
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diff = abs(ar933x_uart_get_baud(clk, tscale, tstep) - baud);
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if (diff < min_diff) {
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min_diff = diff;
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*scale = tscale;
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*step = tstep;
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}
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}
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}
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static void ar933x_uart_set_termios(struct uart_port *port,
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struct ktermios *new,
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struct ktermios *old)
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{
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struct ar933x_uart_port *up =
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container_of(port, struct ar933x_uart_port, port);
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unsigned int cs;
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unsigned long flags;
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unsigned int baud, scale, step;
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/* Only CS8 is supported */
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new->c_cflag &= ~CSIZE;
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new->c_cflag |= CS8;
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/* Only one stop bit is supported */
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new->c_cflag &= ~CSTOPB;
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cs = 0;
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if (new->c_cflag & PARENB) {
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if (!(new->c_cflag & PARODD))
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cs |= AR933X_UART_CS_PARITY_EVEN;
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else
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cs |= AR933X_UART_CS_PARITY_ODD;
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} else {
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cs |= AR933X_UART_CS_PARITY_NONE;
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}
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/* Mark/space parity is not supported */
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new->c_cflag &= ~CMSPAR;
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baud = uart_get_baud_rate(port, new, old, up->min_baud, up->max_baud);
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ar933x_uart_get_scale_step(port->uartclk, baud, &scale, &step);
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/*
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* Ok, we're now changing the port state. Do it with
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* interrupts disabled.
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*/
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spin_lock_irqsave(&up->port.lock, flags);
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/* disable the UART */
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ar933x_uart_rmw_clear(up, AR933X_UART_CS_REG,
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AR933X_UART_CS_IF_MODE_M << AR933X_UART_CS_IF_MODE_S);
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/* Update the per-port timeout. */
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uart_update_timeout(port, new->c_cflag, baud);
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up->port.ignore_status_mask = 0;
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/* ignore all characters if CREAD is not set */
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if ((new->c_cflag & CREAD) == 0)
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up->port.ignore_status_mask |= AR933X_DUMMY_STATUS_RD;
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ar933x_uart_write(up, AR933X_UART_CLOCK_REG,
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scale << AR933X_UART_CLOCK_SCALE_S | step);
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/* setup configuration register */
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ar933x_uart_rmw(up, AR933X_UART_CS_REG, AR933X_UART_CS_PARITY_M, cs);
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/* enable host interrupt */
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ar933x_uart_rmw_set(up, AR933X_UART_CS_REG,
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AR933X_UART_CS_HOST_INT_EN);
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/* reenable the UART */
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ar933x_uart_rmw(up, AR933X_UART_CS_REG,
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AR933X_UART_CS_IF_MODE_M << AR933X_UART_CS_IF_MODE_S,
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AR933X_UART_CS_IF_MODE_DCE << AR933X_UART_CS_IF_MODE_S);
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spin_unlock_irqrestore(&up->port.lock, flags);
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if (tty_termios_baud_rate(new))
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tty_termios_encode_baud_rate(new, baud, baud);
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}
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static void ar933x_uart_rx_chars(struct ar933x_uart_port *up)
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{
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struct tty_port *port = &up->port.state->port;
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int max_count = 256;
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do {
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unsigned int rdata;
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unsigned char ch;
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rdata = ar933x_uart_read(up, AR933X_UART_DATA_REG);
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if ((rdata & AR933X_UART_DATA_RX_CSR) == 0)
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break;
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/* remove the character from the FIFO */
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ar933x_uart_write(up, AR933X_UART_DATA_REG,
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AR933X_UART_DATA_RX_CSR);
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up->port.icount.rx++;
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ch = rdata & AR933X_UART_DATA_TX_RX_MASK;
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if (uart_handle_sysrq_char(&up->port, ch))
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continue;
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if ((up->port.ignore_status_mask & AR933X_DUMMY_STATUS_RD) == 0)
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tty_insert_flip_char(port, ch, TTY_NORMAL);
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} while (max_count-- > 0);
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spin_unlock(&up->port.lock);
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tty_flip_buffer_push(port);
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spin_lock(&up->port.lock);
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}
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static void ar933x_uart_tx_chars(struct ar933x_uart_port *up)
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{
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struct circ_buf *xmit = &up->port.state->xmit;
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int count;
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if (uart_tx_stopped(&up->port))
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return;
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count = up->port.fifosize;
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do {
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unsigned int rdata;
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rdata = ar933x_uart_read(up, AR933X_UART_DATA_REG);
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if ((rdata & AR933X_UART_DATA_TX_CSR) == 0)
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break;
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if (up->port.x_char) {
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ar933x_uart_putc(up, up->port.x_char);
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up->port.icount.tx++;
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up->port.x_char = 0;
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continue;
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}
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if (uart_circ_empty(xmit))
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break;
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ar933x_uart_putc(up, xmit->buf[xmit->tail]);
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xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
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up->port.icount.tx++;
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} while (--count > 0);
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if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
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uart_write_wakeup(&up->port);
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if (!uart_circ_empty(xmit))
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ar933x_uart_start_tx_interrupt(up);
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}
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static irqreturn_t ar933x_uart_interrupt(int irq, void *dev_id)
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{
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struct ar933x_uart_port *up = dev_id;
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unsigned int status;
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status = ar933x_uart_read(up, AR933X_UART_CS_REG);
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if ((status & AR933X_UART_CS_HOST_INT) == 0)
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return IRQ_NONE;
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spin_lock(&up->port.lock);
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status = ar933x_uart_read(up, AR933X_UART_INT_REG);
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status &= ar933x_uart_read(up, AR933X_UART_INT_EN_REG);
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if (status & AR933X_UART_INT_RX_VALID) {
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ar933x_uart_write(up, AR933X_UART_INT_REG,
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AR933X_UART_INT_RX_VALID);
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ar933x_uart_rx_chars(up);
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}
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if (status & AR933X_UART_INT_TX_EMPTY) {
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ar933x_uart_write(up, AR933X_UART_INT_REG,
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AR933X_UART_INT_TX_EMPTY);
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ar933x_uart_stop_tx_interrupt(up);
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ar933x_uart_tx_chars(up);
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}
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spin_unlock(&up->port.lock);
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return IRQ_HANDLED;
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}
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static int ar933x_uart_startup(struct uart_port *port)
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{
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struct ar933x_uart_port *up =
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container_of(port, struct ar933x_uart_port, port);
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unsigned long flags;
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int ret;
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ret = request_irq(up->port.irq, ar933x_uart_interrupt,
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up->port.irqflags, dev_name(up->port.dev), up);
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if (ret)
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return ret;
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spin_lock_irqsave(&up->port.lock, flags);
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/* Enable HOST interrupts */
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ar933x_uart_rmw_set(up, AR933X_UART_CS_REG,
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AR933X_UART_CS_HOST_INT_EN);
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/* Enable RX interrupts */
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up->ier = AR933X_UART_INT_RX_VALID;
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ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier);
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spin_unlock_irqrestore(&up->port.lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ar933x_uart_shutdown(struct uart_port *port)
|
|
{
|
|
struct ar933x_uart_port *up =
|
|
container_of(port, struct ar933x_uart_port, port);
|
|
|
|
/* Disable all interrupts */
|
|
up->ier = 0;
|
|
ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier);
|
|
|
|
/* Disable break condition */
|
|
ar933x_uart_rmw_clear(up, AR933X_UART_CS_REG,
|
|
AR933X_UART_CS_TX_BREAK);
|
|
|
|
free_irq(up->port.irq, up);
|
|
}
|
|
|
|
static const char *ar933x_uart_type(struct uart_port *port)
|
|
{
|
|
return (port->type == PORT_AR933X) ? "AR933X UART" : NULL;
|
|
}
|
|
|
|
static void ar933x_uart_release_port(struct uart_port *port)
|
|
{
|
|
/* Nothing to release ... */
|
|
}
|
|
|
|
static int ar933x_uart_request_port(struct uart_port *port)
|
|
{
|
|
/* UARTs always present */
|
|
return 0;
|
|
}
|
|
|
|
static void ar933x_uart_config_port(struct uart_port *port, int flags)
|
|
{
|
|
if (flags & UART_CONFIG_TYPE)
|
|
port->type = PORT_AR933X;
|
|
}
|
|
|
|
static int ar933x_uart_verify_port(struct uart_port *port,
|
|
struct serial_struct *ser)
|
|
{
|
|
struct ar933x_uart_port *up =
|
|
container_of(port, struct ar933x_uart_port, port);
|
|
|
|
if (ser->type != PORT_UNKNOWN &&
|
|
ser->type != PORT_AR933X)
|
|
return -EINVAL;
|
|
|
|
if (ser->irq < 0 || ser->irq >= NR_IRQS)
|
|
return -EINVAL;
|
|
|
|
if (ser->baud_base < up->min_baud ||
|
|
ser->baud_base > up->max_baud)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct uart_ops ar933x_uart_ops = {
|
|
.tx_empty = ar933x_uart_tx_empty,
|
|
.set_mctrl = ar933x_uart_set_mctrl,
|
|
.get_mctrl = ar933x_uart_get_mctrl,
|
|
.stop_tx = ar933x_uart_stop_tx,
|
|
.start_tx = ar933x_uart_start_tx,
|
|
.stop_rx = ar933x_uart_stop_rx,
|
|
.break_ctl = ar933x_uart_break_ctl,
|
|
.startup = ar933x_uart_startup,
|
|
.shutdown = ar933x_uart_shutdown,
|
|
.set_termios = ar933x_uart_set_termios,
|
|
.type = ar933x_uart_type,
|
|
.release_port = ar933x_uart_release_port,
|
|
.request_port = ar933x_uart_request_port,
|
|
.config_port = ar933x_uart_config_port,
|
|
.verify_port = ar933x_uart_verify_port,
|
|
};
|
|
|
|
static struct ar933x_uart_port *
|
|
ar933x_console_ports[CONFIG_SERIAL_AR933X_NR_UARTS];
|
|
|
|
static void ar933x_uart_wait_xmitr(struct ar933x_uart_port *up)
|
|
{
|
|
unsigned int status;
|
|
unsigned int timeout = 60000;
|
|
|
|
/* Wait up to 60ms for the character(s) to be sent. */
|
|
do {
|
|
status = ar933x_uart_read(up, AR933X_UART_DATA_REG);
|
|
if (--timeout == 0)
|
|
break;
|
|
udelay(1);
|
|
} while ((status & AR933X_UART_DATA_TX_CSR) == 0);
|
|
}
|
|
|
|
static void ar933x_uart_console_putchar(struct uart_port *port, int ch)
|
|
{
|
|
struct ar933x_uart_port *up =
|
|
container_of(port, struct ar933x_uart_port, port);
|
|
|
|
ar933x_uart_wait_xmitr(up);
|
|
ar933x_uart_putc(up, ch);
|
|
}
|
|
|
|
static void ar933x_uart_console_write(struct console *co, const char *s,
|
|
unsigned int count)
|
|
{
|
|
struct ar933x_uart_port *up = ar933x_console_ports[co->index];
|
|
unsigned long flags;
|
|
unsigned int int_en;
|
|
int locked = 1;
|
|
|
|
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);
|
|
|
|
/*
|
|
* First save the IER then disable the interrupts
|
|
*/
|
|
int_en = ar933x_uart_read(up, AR933X_UART_INT_EN_REG);
|
|
ar933x_uart_write(up, AR933X_UART_INT_EN_REG, 0);
|
|
|
|
uart_console_write(&up->port, s, count, ar933x_uart_console_putchar);
|
|
|
|
/*
|
|
* Finally, wait for transmitter to become empty
|
|
* and restore the IER
|
|
*/
|
|
ar933x_uart_wait_xmitr(up);
|
|
ar933x_uart_write(up, AR933X_UART_INT_EN_REG, int_en);
|
|
|
|
ar933x_uart_write(up, AR933X_UART_INT_REG, AR933X_UART_INT_ALLINTS);
|
|
|
|
if (locked)
|
|
spin_unlock(&up->port.lock);
|
|
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static int ar933x_uart_console_setup(struct console *co, char *options)
|
|
{
|
|
struct ar933x_uart_port *up;
|
|
int baud = 115200;
|
|
int bits = 8;
|
|
int parity = 'n';
|
|
int flow = 'n';
|
|
|
|
if (co->index < 0 || co->index >= CONFIG_SERIAL_AR933X_NR_UARTS)
|
|
return -EINVAL;
|
|
|
|
up = ar933x_console_ports[co->index];
|
|
if (!up)
|
|
return -ENODEV;
|
|
|
|
if (options)
|
|
uart_parse_options(options, &baud, &parity, &bits, &flow);
|
|
|
|
return uart_set_options(&up->port, co, baud, parity, bits, flow);
|
|
}
|
|
|
|
static struct console ar933x_uart_console = {
|
|
.name = "ttyATH",
|
|
.write = ar933x_uart_console_write,
|
|
.device = uart_console_device,
|
|
.setup = ar933x_uart_console_setup,
|
|
.flags = CON_PRINTBUFFER,
|
|
.index = -1,
|
|
.data = &ar933x_uart_driver,
|
|
};
|
|
|
|
static void ar933x_uart_add_console_port(struct ar933x_uart_port *up)
|
|
{
|
|
if (!ar933x_uart_console_enabled())
|
|
return;
|
|
|
|
ar933x_console_ports[up->port.line] = up;
|
|
}
|
|
|
|
static struct uart_driver ar933x_uart_driver = {
|
|
.owner = THIS_MODULE,
|
|
.driver_name = DRIVER_NAME,
|
|
.dev_name = "ttyATH",
|
|
.nr = CONFIG_SERIAL_AR933X_NR_UARTS,
|
|
.cons = NULL, /* filled in runtime */
|
|
};
|
|
|
|
static int ar933x_uart_probe(struct platform_device *pdev)
|
|
{
|
|
struct ar933x_uart_port *up;
|
|
struct uart_port *port;
|
|
struct resource *mem_res;
|
|
struct resource *irq_res;
|
|
struct device_node *np;
|
|
unsigned int baud;
|
|
int id;
|
|
int ret;
|
|
|
|
np = pdev->dev.of_node;
|
|
if (IS_ENABLED(CONFIG_OF) && np) {
|
|
id = of_alias_get_id(np, "serial");
|
|
if (id < 0) {
|
|
dev_err(&pdev->dev, "unable to get alias id, err=%d\n",
|
|
id);
|
|
return id;
|
|
}
|
|
} else {
|
|
id = pdev->id;
|
|
if (id == -1)
|
|
id = 0;
|
|
}
|
|
|
|
if (id >= CONFIG_SERIAL_AR933X_NR_UARTS)
|
|
return -EINVAL;
|
|
|
|
irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
|
|
if (!irq_res) {
|
|
dev_err(&pdev->dev, "no IRQ resource\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
up = devm_kzalloc(&pdev->dev, sizeof(struct ar933x_uart_port),
|
|
GFP_KERNEL);
|
|
if (!up)
|
|
return -ENOMEM;
|
|
|
|
up->clk = devm_clk_get(&pdev->dev, "uart");
|
|
if (IS_ERR(up->clk)) {
|
|
dev_err(&pdev->dev, "unable to get UART clock\n");
|
|
return PTR_ERR(up->clk);
|
|
}
|
|
|
|
port = &up->port;
|
|
|
|
mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
port->membase = devm_ioremap_resource(&pdev->dev, mem_res);
|
|
if (IS_ERR(port->membase))
|
|
return PTR_ERR(port->membase);
|
|
|
|
ret = clk_prepare_enable(up->clk);
|
|
if (ret)
|
|
return ret;
|
|
|
|
port->uartclk = clk_get_rate(up->clk);
|
|
if (!port->uartclk) {
|
|
ret = -EINVAL;
|
|
goto err_disable_clk;
|
|
}
|
|
|
|
port->mapbase = mem_res->start;
|
|
port->line = id;
|
|
port->irq = irq_res->start;
|
|
port->dev = &pdev->dev;
|
|
port->type = PORT_AR933X;
|
|
port->iotype = UPIO_MEM32;
|
|
|
|
port->regshift = 2;
|
|
port->fifosize = AR933X_UART_FIFO_SIZE;
|
|
port->ops = &ar933x_uart_ops;
|
|
|
|
baud = ar933x_uart_get_baud(port->uartclk, AR933X_UART_MAX_SCALE, 1);
|
|
up->min_baud = max_t(unsigned int, baud, AR933X_UART_MIN_BAUD);
|
|
|
|
baud = ar933x_uart_get_baud(port->uartclk, 0, AR933X_UART_MAX_STEP);
|
|
up->max_baud = min_t(unsigned int, baud, AR933X_UART_MAX_BAUD);
|
|
|
|
ar933x_uart_add_console_port(up);
|
|
|
|
ret = uart_add_one_port(&ar933x_uart_driver, &up->port);
|
|
if (ret)
|
|
goto err_disable_clk;
|
|
|
|
platform_set_drvdata(pdev, up);
|
|
return 0;
|
|
|
|
err_disable_clk:
|
|
clk_disable_unprepare(up->clk);
|
|
return ret;
|
|
}
|
|
|
|
static int ar933x_uart_remove(struct platform_device *pdev)
|
|
{
|
|
struct ar933x_uart_port *up;
|
|
|
|
up = platform_get_drvdata(pdev);
|
|
|
|
if (up) {
|
|
uart_remove_one_port(&ar933x_uart_driver, &up->port);
|
|
clk_disable_unprepare(up->clk);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id ar933x_uart_of_ids[] = {
|
|
{ .compatible = "qca,ar9330-uart" },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, ar933x_uart_of_ids);
|
|
#endif
|
|
|
|
static struct platform_driver ar933x_uart_platform_driver = {
|
|
.probe = ar933x_uart_probe,
|
|
.remove = ar933x_uart_remove,
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
.of_match_table = of_match_ptr(ar933x_uart_of_ids),
|
|
},
|
|
};
|
|
|
|
static int __init ar933x_uart_init(void)
|
|
{
|
|
int ret;
|
|
|
|
if (ar933x_uart_console_enabled())
|
|
ar933x_uart_driver.cons = &ar933x_uart_console;
|
|
|
|
ret = uart_register_driver(&ar933x_uart_driver);
|
|
if (ret)
|
|
goto err_out;
|
|
|
|
ret = platform_driver_register(&ar933x_uart_platform_driver);
|
|
if (ret)
|
|
goto err_unregister_uart_driver;
|
|
|
|
return 0;
|
|
|
|
err_unregister_uart_driver:
|
|
uart_unregister_driver(&ar933x_uart_driver);
|
|
err_out:
|
|
return ret;
|
|
}
|
|
|
|
static void __exit ar933x_uart_exit(void)
|
|
{
|
|
platform_driver_unregister(&ar933x_uart_platform_driver);
|
|
uart_unregister_driver(&ar933x_uart_driver);
|
|
}
|
|
|
|
module_init(ar933x_uart_init);
|
|
module_exit(ar933x_uart_exit);
|
|
|
|
MODULE_DESCRIPTION("Atheros AR933X UART driver");
|
|
MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:" DRIVER_NAME);
|