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Date: Tue, 16 Jul 2013 14:46:28 +0300
From: "Ivan T. Ivanov" <iivanov@...sol.com>
To: gregkh@...uxfoundation.org
Cc: grant.likely@...aro.org, rob.herring@...xeda.com, rob@...dley.net,
jslaby@...e.cz, devicetree-discuss@...ts.ozlabs.org,
linux-serial@...r.kernel.org, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
mrana@...eaurora.org, sambley@...eaurora.org
Subject: Re: [PATCH] tty: serial: Add initial MSM UART High Speed Lite driver
Hi Greg,
On Mon, 2013-07-01 at 12:11 +0300, Ivan T. Ivanov wrote:
> From: "Ivan T. Ivanov" <iivanov@...sol.com>
>
> This is a tty driver with console support for Qualcomm's UART
> controllers found in the MSM8974 chipsets. Driver is completely
> based on implementation found in codeaurora.org msm_serial_hs_lite
> with Android dependences removed. Other changes include, moved to
> device managed resources and few cleanups.
>
> Driver functionality was tested in LEGACY_HSUART mode.
>
Please, could you take a look at this driver. It have been
tested on these new Snapdragon 8074 based DragonBoards.
If there is something that I have to fix or improve in
the code please let me know.
Regards,
Ivan
> Signed-off-by: Ivan T. Ivanov <iivanov@...sol.com>
> ---
> .../bindings/tty/serial/msm_serial_hsl.txt | 52 +
> drivers/tty/serial/Kconfig | 18 +
> drivers/tty/serial/Makefile | 1 +
> drivers/tty/serial/msm_serial_hsl.c | 1399 ++++++++++++++++++++
> drivers/tty/serial/msm_serial_hsl.h | 294 ++++
> 5 files changed, 1764 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/tty/serial/msm_serial_hsl.txt
> create mode 100644 drivers/tty/serial/msm_serial_hsl.c
> create mode 100644 drivers/tty/serial/msm_serial_hsl.h
>
> diff --git a/Documentation/devicetree/bindings/tty/serial/msm_serial_hsl.txt b/Documentation/devicetree/bindings/tty/serial/msm_serial_hsl.txt
> new file mode 100644
> index 0000000..972552f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/tty/serial/msm_serial_hsl.txt
> @@ -0,0 +1,52 @@
> +* Qualcomm MSM HSUART Lite
> +
> +Required properties:
> +- compatible :
> + "qcom,msm-lsuart-v14" to be used for UARTDM Core v1.4
> +
> +- reg :
> + offset and length of the register set for both the device,
> + UART core and GBSI core
> +
> +- reg-names :
> + "uart_mem" to be used as name of the UART core
> + "gbsi_mem" to be used as name of the GBSI core
> +
> +The registers for the "qcom,msm-lsuart-v14" device have specify
> +UART core block. GSBI reg is optional if specified driver will use
> +GSBI specific functionality.
> +
> +- interrupts : interrupts for UART core
> +
> +- clocks : Must contain an entry for each entry in clock-names.
> +
> +- clock-names : Must include the following entries:
> + "core_clk" - mandatory
> + "iface_clk" - optional
> +
> +For details see:
> +Documentation/devicetree/bindings/clock/clock-bindings.txt
> +
> +Example:
> +
> + serial@...1e000 {
> + compatible = "qcom,msm-lsuart-v14";
> + reg = <0xf991e000 0x1000>;
> + reg-names = "uart_mem";
> + interrupts = <0 108 0>;
> + clocks = <&blsp1_uart2_apps_cxc>, <&blsp1_ahb_cxc>;
> + clock-names = "core_clk", "iface_clk";
> + };
> +
> +Aliases :
> +An alias may be optionally used to bind the UART device to a TTY device
> +(ttyHSL<alias_num>) with a given alias number. Aliases are of the form
> +uart<n> where <n> is an integer representing the alias number to use.
> +On systems with multiple UART devices present, an alias may optionally be
> +defined for such devices. The alias value should be from 0 to 255.
> +
> +Example:
> +
> + aliases {
> + uart4 = &uart7; // This device will be enumerated as ttyHSL4
> + };
> diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
> index 7e7006f..4482bc7 100644
> --- a/drivers/tty/serial/Kconfig
> +++ b/drivers/tty/serial/Kconfig
> @@ -1046,6 +1046,24 @@ config SERIAL_MSM_HS
> Choose M here to compile it as a module. The module will be
> called msm_serial_hs.
>
> +config SERIAL_MSM_HSL
> + tristate "MSM High speed serial lite mode driver"
> + depends on ARM && ARCH_MSM
> + select SERIAL_CORE
> + default n
> + help
> + Select this module to enable MSM high speed lite mode driver
> + for UART controllers found in MSM8974 SoC's
> +
> + Choose M here to compile it as a module. The module will be
> + called msm_serial_hsl.
> +
> +config SERIAL_MSM_HSL_CONSOLE
> + bool "MSM High speed serial lite mode console support"
> + depends on SERIAL_MSM_HSL=y
> + select SERIAL_CORE_CONSOLE
> + default n
> +
> config SERIAL_VT8500
> bool "VIA VT8500 on-chip serial port support"
> depends on ARCH_VT8500
> diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
> index eedfec4..86c023b 100644
> --- a/drivers/tty/serial/Makefile
> +++ b/drivers/tty/serial/Makefile
> @@ -58,6 +58,7 @@ obj-$(CONFIG_SERIAL_ATMEL) += atmel_serial.o
> obj-$(CONFIG_SERIAL_UARTLITE) += uartlite.o
> obj-$(CONFIG_SERIAL_MSM) += msm_serial.o
> obj-$(CONFIG_SERIAL_MSM_HS) += msm_serial_hs.o
> +obj-$(CONFIG_SERIAL_MSM_HSL) += msm_serial_hsl.o
> obj-$(CONFIG_SERIAL_NETX) += netx-serial.o
> obj-$(CONFIG_SERIAL_OF_PLATFORM) += of_serial.o
> obj-$(CONFIG_SERIAL_OF_PLATFORM_NWPSERIAL) += nwpserial.o
> diff --git a/drivers/tty/serial/msm_serial_hsl.c b/drivers/tty/serial/msm_serial_hsl.c
> new file mode 100644
> index 0000000..56c15a8
> --- /dev/null
> +++ b/drivers/tty/serial/msm_serial_hsl.c
> @@ -0,0 +1,1399 @@
> +/*
> + * drivers/tty/serial/msm_serial_hsl.c - driver for serial device and console
> + *
> + * Copyright (C) 2007 Google, Inc.
> + * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
> + *
> + * This software is licensed under the terms of the GNU General Public
> + * License version 2, as published by the Free Software Foundation, and
> + * may be copied, distributed, and modified under those terms.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +/* Acknowledgements:
> + * This file is based on msm_serial.c, originally
> + * Written by Robert Love <rlove@...gle.com> */
> +
> +#include <linux/clk.h>
> +#include <linux/console.h>
> +#include <linux/debugfs.h>
> +#include <linux/delay.h>
> +#include <linux/io.h>
> +#include <linux/irq.h>
> +#include <linux/module.h>
> +#include <linux/nmi.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/serial_core.h>
> +#include <linux/tty.h>
> +#include <linux/tty_flip.h>
> +
> +#include "msm_serial_hsl.h"
> +
> +/*
> + * There are 3 different kind of UART Core available on MSM.
> + * High Speed UART (i.e. Legacy HSUART), GSBI based HSUART
> + * and BSLP based HSUART.
> + */
> +enum uart_core_type {
> + LEGACY_HSUART,
> + GSBI_HSUART,
> + BLSP_HSUART,
> +};
> +
> +/*
> + * @uart: uart port instance
> + * @name: name of the port
> + * @clk: reference to core clock
> + * @pclk: reference to interface clock
> + * @imr: shadow interrupt mask register
> + * @mapped_gsbi: GSBI contol memory
> + * @old_snap_state: How many data still left in the FIFO
> + * @tx_timeout - transmit timout ~600x the character transmit time
> + * @uart_type - see enum uart_core_type
> + * @regmap - Register map based on controller version
> + * It is mainly required where same UART is used across different processor.
> + * Make sure that Clock driver for platform support setting clock rate to zero.
> + */
> +struct msm_hsl_port {
> + struct uart_port uart;
> + char name[16];
> + struct clk *clk;
> + struct clk *pclk;
> + struct dentry *loopback_dir;
> + unsigned int imr;
> + unsigned int *mapped_gsbi;
> + unsigned int old_snap_state;
> + int tx_timeout;
> + enum uart_core_type uart_type;
> + const unsigned int *regmap;
> +};
> +
> +#define UARTDM_VERSION_11_13 0
> +#define UARTDM_VERSION_14 1
> +#define UART_NR 3
> +
> +#define to_hsl_port(p) (container_of(p, struct msm_hsl_port, uart))
> +#define is_console(port) ((port)->cons && \
> + (port)->cons->index == (port)->line)
> +
> +static const unsigned int regmap[][UARTDM_LAST] = {
> + [UARTDM_VERSION_11_13] = {
> + [UARTDM_MR1] = UARTDM_MR1_ADDR,
> + [UARTDM_MR2] = UARTDM_MR2_ADDR,
> + [UARTDM_IMR] = UARTDM_IMR_ADDR,
> + [UARTDM_SR] = UARTDM_SR_ADDR,
> + [UARTDM_CR] = UARTDM_CR_ADDR,
> + [UARTDM_CSR] = UARTDM_CSR_ADDR,
> + [UARTDM_IPR] = UARTDM_IPR_ADDR,
> + [UARTDM_ISR] = UARTDM_ISR_ADDR,
> + [UARTDM_RX_TOTAL_SNAP] = UARTDM_RX_TOTAL_SNAP_ADDR,
> + [UARTDM_TFWR] = UARTDM_TFWR_ADDR,
> + [UARTDM_RFWR] = UARTDM_RFWR_ADDR,
> + [UARTDM_RF] = UARTDM_RF_ADDR,
> + [UARTDM_TF] = UARTDM_TF_ADDR,
> + [UARTDM_MISR] = UARTDM_MISR_ADDR,
> + [UARTDM_DMRX] = UARTDM_DMRX_ADDR,
> + [UARTDM_NCF_TX] = UARTDM_NCF_TX_ADDR,
> + [UARTDM_DMEN] = UARTDM_DMEN_ADDR,
> + [UARTDM_TXFS] = UARTDM_TXFS_ADDR,
> + [UARTDM_RXFS] = UARTDM_RXFS_ADDR,
> + },
> + [UARTDM_VERSION_14] = {
> + [UARTDM_MR1] = UARTDM_MR1_ADDR,
> + [UARTDM_MR2] = UARTDM_MR2_ADDR,
> + [UARTDM_IMR] = UARTDM_IMR_ADDR_V14,
> + [UARTDM_SR] = UARTDM_SR_ADDR_V14,
> + [UARTDM_CR] = UARTDM_CR_ADDR_V14,
> + [UARTDM_CSR] = UARTDM_CSR_ADDR_V14,
> + [UARTDM_IPR] = UARTDM_IPR_ADDR,
> + [UARTDM_ISR] = UARTDM_ISR_ADDR_V14,
> + [UARTDM_RX_TOTAL_SNAP] = UARTDM_RX_TOTAL_SNAP_ADDR_V14,
> + [UARTDM_TFWR] = UARTDM_TFWR_ADDR,
> + [UARTDM_RFWR] = UARTDM_RFWR_ADDR,
> + [UARTDM_RF] = UARTDM_RF_ADDR_V14,
> + [UARTDM_TF] = UARTDM_TF_ADDR_V14,
> + [UARTDM_MISR] = UARTDM_MISR_ADDR_V14,
> + [UARTDM_DMRX] = UARTDM_DMRX_ADDR,
> + [UARTDM_NCF_TX] = UARTDM_NCF_TX_ADDR,
> + [UARTDM_DMEN] = UARTDM_DMEN_ADDR,
> + [UARTDM_TXFS] = UARTDM_TXFS_ADDR,
> + [UARTDM_RXFS] = UARTDM_RXFS_ADDR,
> + },
> +};
> +
> +/*
> + * get_console_state - check the per-port serial console state.
> + * @port: uart_port structure describing the port
> + *
> + * Return the state of serial console availability on port.
> + * return 1: If serial console is enabled on particular UART port.
> + * return 0: If serial console is disabled on particular UART port.
> + */
> +static int get_console_state(struct uart_port *port)
> +{
> +#ifdef CONFIG_SERIAL_MSM_HSL_CONSOLE
> + if (is_console(port) && (port->cons->flags & CON_ENABLED))
> + return 1;
> + else
> + return 0;
> +#else
> + return -ENODEV;
> +#endif
> +}
> +
> +static inline void msm_hsl_write(struct uart_port *port,
> + unsigned int val, unsigned int off)
> +{
> + struct msm_hsl_port *hslp = to_hsl_port(port);
> +
> + iowrite32(val, port->membase + hslp->regmap[off]);
> +}
> +
> +static inline unsigned int msm_hsl_read(struct uart_port *port,
> + unsigned int off)
> +{
> + struct msm_hsl_port *hslp = to_hsl_port(port);
> +
> + return ioread32(port->membase + hslp->regmap[off]);
> +}
> +
> +static unsigned int msm_serial_hsl_has_gsbi(struct uart_port *port)
> +{
> + return (to_hsl_port(port)->uart_type == GSBI_HSUART);
> +}
> +
> +/*
> + * set_gsbi_uart_func_mode: Check the currently used GSBI UART mode
> + * and set the new required GSBI UART Mode if it is different.
> + * @port: uart port
> + */
> +static void set_gsbi_uart_func_mode(struct uart_port *port)
> +{
> + struct msm_hsl_port *hslp = to_hsl_port(port);
> + unsigned int set_mode = GSBI_PROTOCOL_I2C_UART;
> + unsigned int cur_mode;
> +
> + if (hslp->pclk)
> + clk_prepare_enable(hslp->pclk);
> +
> + /* Read current used GSBI UART Mode and set only if it is different. */
> + cur_mode = ioread32(hslp->mapped_gsbi + GSBI_CONTROL_ADDR);
> + if ((cur_mode & GSBI_PROTOCOL_CODE_MASK) != set_mode)
> + /*
> + * Programmed GSBI based UART protocol mode i.e. I2C/UART
> + * Shared Mode or UART Mode.
> + */
> + iowrite32(set_mode, hslp->mapped_gsbi + GSBI_CONTROL_ADDR);
> +
> + if (hslp->pclk)
> + clk_disable_unprepare(hslp->pclk);
> +}
> +
> +static int msm_hsl_clock_enable(struct uart_port *port, int enable)
> +{
> + struct msm_hsl_port *hslp = to_hsl_port(port);
> + int ret = 0;
> +
> + if (enable) {
> + ret = clk_prepare_enable(hslp->clk);
> + if (ret)
> + return ret;
> + if (hslp->pclk) {
> + ret = clk_prepare_enable(hslp->pclk);
> + if (ret)
> + clk_disable_unprepare(hslp->clk);
> + }
> + } else {
> + clk_disable_unprepare(hslp->clk);
> + if (hslp->pclk)
> + clk_disable_unprepare(hslp->pclk);
> + }
> +
> + return ret;
> +}
> +
> +static int msm_hsl_loopback_set(void *data, u64 val)
> +{
> + struct msm_hsl_port *hslp = data;
> + struct uart_port *port = &(hslp->uart);
> + unsigned long flags;
> + int ret = 0;
> +
> + ret = clk_set_rate(hslp->clk, port->uartclk);
> + if (!ret)
> + msm_hsl_clock_enable(port, 1);
> + else
> + return -EINVAL;
> +
> + if (val) {
> + spin_lock_irqsave(&port->lock, flags);
> + ret = msm_hsl_read(port, UARTDM_MR2);
> + ret |= UARTDM_MR2_LOOP_MODE_BMSK;
> + msm_hsl_write(port, ret, UARTDM_MR2);
> + spin_unlock_irqrestore(&port->lock, flags);
> + } else {
> + spin_lock_irqsave(&port->lock, flags);
> + ret = msm_hsl_read(port, UARTDM_MR2);
> + ret &= ~UARTDM_MR2_LOOP_MODE_BMSK;
> + msm_hsl_write(port, ret, UARTDM_MR2);
> + spin_unlock_irqrestore(&port->lock, flags);
> + }
> +
> + msm_hsl_clock_enable(port, 0);
> + return 0;
> +}
> +
> +static int msm_hsl_loopback_get(void *data, u64 *val)
> +{
> + struct msm_hsl_port *hslp = data;
> + struct uart_port *port = &hslp->uart;
> + unsigned long flags;
> + int ret = 0;
> +
> + ret = clk_set_rate(hslp->clk, port->uartclk);
> + if (!ret)
> + msm_hsl_clock_enable(port, 1);
> + else
> + return -EINVAL;
> +
> + spin_lock_irqsave(&port->lock, flags);
> + ret = msm_hsl_read(port, UARTDM_MR2);
> + spin_unlock_irqrestore(&port->lock, flags);
> + msm_hsl_clock_enable(port, 0);
> +
> + *val = (ret & UARTDM_MR2_LOOP_MODE_BMSK) ? 1 : 0;
> + return 0;
> +}
> +
> +static void msm_hsl_stop_tx(struct uart_port *port)
> +{
> + struct msm_hsl_port *hslp = to_hsl_port(port);
> +
> + hslp->imr &= ~UARTDM_ISR_TXLEV_BMSK;
> + msm_hsl_write(port, hslp->imr, UARTDM_IMR);
> +}
> +
> +static void msm_hsl_start_tx(struct uart_port *port)
> +{
> + struct msm_hsl_port *hslp = to_hsl_port(port);
> +
> + hslp->imr |= UARTDM_ISR_TXLEV_BMSK;
> + msm_hsl_write(port, hslp->imr, UARTDM_IMR);
> +}
> +
> +static void msm_hsl_stop_rx(struct uart_port *port)
> +{
> + struct msm_hsl_port *hslp = to_hsl_port(port);
> +
> + hslp->imr &= ~(UARTDM_ISR_RXLEV_BMSK | UARTDM_ISR_RXSTALE_BMSK);
> + msm_hsl_write(port, hslp->imr, UARTDM_IMR);
> +}
> +
> +static void msm_hsl_enable_ms(struct uart_port *port)
> +{
> + struct msm_hsl_port *hslp = to_hsl_port(port);
> +
> + hslp->imr |= UARTDM_ISR_DELTA_CTS_BMSK;
> + msm_hsl_write(port, hslp->imr, UARTDM_IMR);
> +}
> +
> +static void msm_hsl_handle_rx(struct uart_port *port, unsigned int misr)
> +{
> + struct msm_hsl_port *hslp = to_hsl_port(port);
> + struct tty_port *tty = &port->state->port;
> + unsigned int sr;
> + int count = 0;
> +
> + /*
> + * Handle overrun. My understanding of the hardware is that overrun
> + * is not tied to the RX buffer, so we handle the case out of band.
> + */
> + sr = msm_hsl_read(port, UARTDM_SR);
> + if (sr & UARTDM_SR_OVERRUN_BMSK) {
> + port->icount.overrun++;
> + tty_insert_flip_char(tty, 0, TTY_OVERRUN);
> + msm_hsl_write(port, RESET_ERROR_STATUS, UARTDM_CR);
> + }
> +
> + if (misr & UARTDM_ISR_RXSTALE_BMSK) {
> + count = msm_hsl_read(port, UARTDM_RX_TOTAL_SNAP) -
> + hslp->old_snap_state;
> + hslp->old_snap_state = 0;
> + } else {
> + count = 4 * (msm_hsl_read(port, UARTDM_RFWR));
> + hslp->old_snap_state += count;
> + }
> +
> + /* and now the main RX loop */
> + while (count > 0) {
> + unsigned int c;
> + char flag = TTY_NORMAL;
> +
> + sr = msm_hsl_read(port, UARTDM_SR);
> + if ((sr & UARTDM_SR_RXRDY_BMSK) == 0) {
> + hslp->old_snap_state -= count;
> + break;
> + }
> + c = msm_hsl_read(port, UARTDM_RF);
> + if (sr & UARTDM_SR_RX_BREAK_BMSK) {
> + port->icount.brk++;
> + if (uart_handle_break(port))
> + continue;
> + } else if (sr & UARTDM_SR_PAR_FRAME_BMSK) {
> + port->icount.frame++;
> + } else {
> + port->icount.rx++;
> + }
> +
> + /* Mask conditions we're ignorning. */
> + sr &= port->read_status_mask;
> + if (sr & UARTDM_SR_RX_BREAK_BMSK)
> + flag = TTY_BREAK;
> + else if (sr & UARTDM_SR_PAR_FRAME_BMSK)
> + flag = TTY_FRAME;
> +
> + /* TODO: handle sysrq */
> + /* if (!uart_handle_sysrq_char(port, c)) */
> + tty_insert_flip_string(tty, (char *)&c,
> + (count > 4) ? 4 : count);
> + count -= 4;
> + }
> +
> + tty_flip_buffer_push(tty);
> +}
> +
> +static void msm_hsl_dump_regs(struct uart_port *port)
> +{
> + struct msm_hsl_port *hslp = to_hsl_port(port);
> + unsigned int sr, isr, mr1, mr2, ncf, txfs, rxfs, con_state;
> +
> + sr = msm_hsl_read(port, UARTDM_SR);
> + isr = msm_hsl_read(port, UARTDM_ISR);
> + mr1 = msm_hsl_read(port, UARTDM_MR1);
> + mr2 = msm_hsl_read(port, UARTDM_MR2);
> + ncf = msm_hsl_read(port, UARTDM_NCF_TX);
> + txfs = msm_hsl_read(port, UARTDM_TXFS);
> + rxfs = msm_hsl_read(port, UARTDM_RXFS);
> + con_state = get_console_state(port);
> +
> + pr_info("Timeout: %d uS\n", hslp->tx_timeout);
> + pr_info("SR: %08x\n", sr);
> + pr_info("ISR: %08x\n", isr);
> + pr_info("MR1: %08x\n", mr1);
> + pr_info("MR2: %08x\n", mr2);
> + pr_info("NCF: %08x\n", ncf);
> + pr_info("TXFS: %08x\n", txfs);
> + pr_info("RXFS: %08x\n", rxfs);
> + pr_info("Console state: %d\n", con_state);
> +}
> +
> +/*
> + * Wait for transmitter & holding register to empty
> + * Derived from msm_hsl_wait_for_xmitr in 8250 serial driver by Russell King
> + */
> +static void msm_hsl_wait_for_xmitr(struct uart_port *port)
> +{
> + struct msm_hsl_port *hslp = to_hsl_port(port);
> + int count = 0;
> + int sr;
> + int isr;
> +
> + sr = msm_hsl_read(port, UARTDM_SR);
> + if (sr & UARTDM_SR_TXEMT_BMSK)
> + return;
> +
> + do {
> + isr = msm_hsl_read(port, UARTDM_ISR);
> + sr = msm_hsl_read(port, UARTDM_SR);
> +
> + if ((isr & UARTDM_ISR_TX_READY_BMSK) ||
> + (sr & UARTDM_SR_TXEMT_BMSK))
> + break;
> +
> + udelay(1);
> + touch_nmi_watchdog();
> + cpu_relax();
> +
> + if (++count == hslp->tx_timeout) {
> + msm_hsl_dump_regs(port);
> + panic("MSM HSL msm_hsl_wait_for_xmitr is stuck!");
> + }
> +
> + } while (true);
> +
> + msm_hsl_write(port, CLEAR_TX_READY, UARTDM_CR);
> +
> +}
> +
> +static void msm_hsl_handle_tx(struct uart_port *port)
> +{
> + struct circ_buf *xmit = &port->state->xmit;
> + unsigned int tf_pointer = 0;
> + int sent_tx;
> + int tx_count;
> + int x;
> + int sr;
> +
> + tx_count = uart_circ_chars_pending(xmit);
> +
> + if (tx_count > (UART_XMIT_SIZE - xmit->tail))
> + tx_count = UART_XMIT_SIZE - xmit->tail;
> + if (tx_count >= port->fifosize)
> + tx_count = port->fifosize;
> +
> + /* Handle x_char */
> + if (port->x_char) {
> + msm_hsl_wait_for_xmitr(port);
> + msm_hsl_write(port, tx_count + 1, UARTDM_NCF_TX);
> + msm_hsl_read(port, UARTDM_NCF_TX);
> + msm_hsl_write(port, port->x_char, UARTDM_TF);
> + port->icount.tx++;
> + port->x_char = 0;
> + } else if (tx_count) {
> + msm_hsl_wait_for_xmitr(port);
> + msm_hsl_write(port, tx_count, UARTDM_NCF_TX);
> + msm_hsl_read(port, UARTDM_NCF_TX);
> + }
> + if (!tx_count) {
> + msm_hsl_stop_tx(port);
> + return;
> + }
> +
> + while (tf_pointer < tx_count) {
> + sr = msm_hsl_read(port, UARTDM_SR);
> + if (!(sr & UARTDM_SR_TXRDY_BMSK))
> + continue;
> + switch (tx_count - tf_pointer) {
> + case 1:
> + x = xmit->buf[xmit->tail];
> + port->icount.tx++;
> + break;
> + case 2:
> + x = xmit->buf[xmit->tail]
> + | xmit->buf[xmit->tail + 1] << 8;
> + port->icount.tx += 2;
> + break;
> + case 3:
> + x = xmit->buf[xmit->tail]
> + | xmit->buf[xmit->tail + 1] << 8
> + | xmit->buf[xmit->tail + 2] << 16;
> + port->icount.tx += 3;
> + break;
> + default:
> + x = *((int *)&(xmit->buf[xmit->tail]));
> + port->icount.tx += 4;
> + break;
> + }
> + msm_hsl_write(port, x, UARTDM_TF);
> + xmit->tail = ((tx_count - tf_pointer < 4) ?
> + (tx_count - tf_pointer + xmit->tail) :
> + (xmit->tail + 4)) & (UART_XMIT_SIZE - 1);
> + tf_pointer += 4;
> + sent_tx = 1;
> + }
> +
> + if (uart_circ_empty(xmit))
> + msm_hsl_stop_tx(port);
> +
> + if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
> + uart_write_wakeup(port);
> +
> +}
> +
> +static void msm_hsl_handle_delta_cts(struct uart_port *port)
> +{
> + msm_hsl_write(port, RESET_CTS, UARTDM_CR);
> + port->icount.cts++;
> + wake_up_interruptible(&port->state->port.delta_msr_wait);
> +}
> +
> +static irqreturn_t msm_hsl_irq(int irq, void *dev_id)
> +{
> + struct uart_port *port = dev_id;
> + struct msm_hsl_port *hslp = to_hsl_port(port);
> + unsigned int misr;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&port->lock, flags);
> + misr = msm_hsl_read(port, UARTDM_MISR);
> + /* disable interrupt */
> + msm_hsl_write(port, 0, UARTDM_IMR);
> +
> + if (misr & (UARTDM_ISR_RXSTALE_BMSK | UARTDM_ISR_RXLEV_BMSK)) {
> + msm_hsl_handle_rx(port, misr);
> + if (misr & (UARTDM_ISR_RXSTALE_BMSK))
> + msm_hsl_write(port, RESET_STALE_INT,
> + UARTDM_CR);
> + msm_hsl_write(port, 6500, UARTDM_DMRX);
> + msm_hsl_write(port, STALE_EVENT_ENABLE, UARTDM_CR);
> + }
> + if (misr & UARTDM_ISR_TXLEV_BMSK)
> + msm_hsl_handle_tx(port);
> +
> + if (misr & UARTDM_ISR_DELTA_CTS_BMSK)
> + msm_hsl_handle_delta_cts(port);
> +
> + /* restore interrupt */
> + msm_hsl_write(port, hslp->imr, UARTDM_IMR);
> + spin_unlock_irqrestore(&port->lock, flags);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static unsigned int msm_hsl_tx_empty(struct uart_port *port)
> +{
> + unsigned int ret;
> +
> + ret = msm_hsl_read(port, UARTDM_SR);
> + ret &= UARTDM_SR_TXEMT_BMSK;
> +
> + if (ret)
> + ret = TIOCSER_TEMT;
> +
> + return ret;
> +}
> +
> +static void msm_hsl_reset(struct uart_port *port)
> +{
> + /* reset everything */
> + msm_hsl_write(port, RESET_RX, UARTDM_CR);
> + msm_hsl_write(port, RESET_TX, UARTDM_CR);
> + msm_hsl_write(port, RESET_ERROR_STATUS, UARTDM_CR);
> + msm_hsl_write(port, RESET_BREAK_INT, UARTDM_CR);
> + msm_hsl_write(port, RESET_CTS, UARTDM_CR);
> + msm_hsl_write(port, RFR_LOW, UARTDM_CR);
> +}
> +
> +static unsigned int msm_hsl_get_mctrl(struct uart_port *port)
> +{
> + return TIOCM_CAR | TIOCM_CTS | TIOCM_DSR | TIOCM_RTS;
> +}
> +
> +static void msm_hsl_set_mctrl(struct uart_port *port, unsigned int mctrl)
> +{
> + unsigned int mr;
> + unsigned int loop_mode;
> +
> + mr = msm_hsl_read(port, UARTDM_MR1);
> +
> + if (!(mctrl & TIOCM_RTS)) {
> + mr &= ~UARTDM_MR1_RX_RDY_CTL_BMSK;
> + msm_hsl_write(port, mr, UARTDM_MR1);
> + msm_hsl_write(port, RFR_HIGH, UARTDM_CR);
> + } else {
> + mr |= UARTDM_MR1_RX_RDY_CTL_BMSK;
> + msm_hsl_write(port, mr, UARTDM_MR1);
> + }
> +
> + loop_mode = TIOCM_LOOP & mctrl;
> + if (loop_mode) {
> + mr = msm_hsl_read(port, UARTDM_MR2);
> + mr |= UARTDM_MR2_LOOP_MODE_BMSK;
> + msm_hsl_write(port, mr, UARTDM_MR2);
> +
> + /* Reset TX */
> + msm_hsl_reset(port);
> +
> + /* Turn on Uart Receiver & Transmitter */
> + msm_hsl_write(port, UARTDM_CR_RX_EN_BMSK | UARTDM_CR_TX_EN_BMSK,
> + UARTDM_CR);
> + }
> +}
> +
> +static void msm_hsl_break_ctl(struct uart_port *port, int break_ctl)
> +{
> +
> + if (break_ctl)
> + msm_hsl_write(port, START_BREAK, UARTDM_CR);
> + else
> + msm_hsl_write(port, STOP_BREAK, UARTDM_CR);
> +}
> +
> +/*
> + * msm_hsl_set_baud_rate: set requested baud rate
> + * @port: uart port
> + * @baud: baud rate to set (in bps)
> + */
> +static void msm_hsl_set_baud_rate(struct uart_port *port, unsigned int baud)
> +{
> + struct msm_hsl_port *hslp = to_hsl_port(port);
> + unsigned int baud_code, rxstale, watermark;
> + unsigned int data;
> +
> + switch (baud) {
> + case 300:
> + baud_code = 0x00;
> + rxstale = 1;
> + break;
> + case 600:
> + baud_code = 0x11;
> + rxstale = 1;
> + break;
> + case 1200:
> + baud_code = 0x22;
> + rxstale = 1;
> + break;
> + case 2400:
> + baud_code = 0x33;
> + rxstale = 1;
> + break;
> + case 4800:
> + baud_code = 0x44;
> + rxstale = 1;
> + break;
> + case 9600:
> + baud_code = 0x55;
> + rxstale = 2;
> + break;
> + case 14400:
> + baud_code = 0x66;
> + rxstale = 3;
> + break;
> + case 19200:
> + baud_code = 0x77;
> + rxstale = 4;
> + break;
> + case 28800:
> + baud_code = 0x88;
> + rxstale = 6;
> + break;
> + case 38400:
> + baud_code = 0x99;
> + rxstale = 8;
> + break;
> + case 57600:
> + baud_code = 0xaa;
> + rxstale = 16;
> + break;
> + case 115200:
> + baud_code = 0xcc;
> + rxstale = 31;
> + break;
> + case 230400:
> + baud_code = 0xee;
> + rxstale = 31;
> + break;
> + case 460800:
> + baud_code = 0xff;
> + rxstale = 31;
> + break;
> + default: /*115200 baud rate */
> + baud_code = 0xcc;
> + rxstale = 31;
> + break;
> + }
> +
> + msm_hsl_write(port, baud_code, UARTDM_CSR);
> +
> + /*
> + * uart baud rate depends on CSR and MND Values
> + * we are updating CSR before and then calling
> + * clk_set_rate which updates MND Values. Hence
> + * dsb requires here.
> + */
> + mb();
> +
> + /*
> + * Check requested baud rate and for higher baud rate than 460800,
> + * calculate required uart clock frequency and set the same.
> + */
> + if (baud > 460800)
> + port->uartclk = baud * 16;
> + else
> + port->uartclk = 7372800;
> +
> + if (clk_set_rate(hslp->clk, port->uartclk)) {
> + WARN_ON(1);
> + return;
> + }
> +
> + /* Set timeout to be ~600x the character transmit time */
> + hslp->tx_timeout = (1000000000 / baud) * 6;
> +
> + /* RX stale watermark */
> + watermark = UARTDM_IPR_STALE_LSB_BMSK & rxstale;
> + watermark |= UARTDM_IPR_STALE_TIMEOUT_MSB_BMSK & (rxstale << 2);
> + msm_hsl_write(port, watermark, UARTDM_IPR);
> +
> + /* Set RX watermark
> + * Configure Rx Watermark as 3/4 size of Rx FIFO.
> + * RFWR register takes value in Words for UARTDM Core
> + * whereas it is consider to be in Bytes for UART Core.
> + * Hence configuring Rx Watermark as 48 Words.
> + */
> + watermark = (port->fifosize * 3) / 4;
> + msm_hsl_write(port, watermark, UARTDM_RFWR);
> +
> + /* set TX watermark */
> + msm_hsl_write(port, 0, UARTDM_TFWR);
> +
> + msm_hsl_write(port, CR_PROTECTION_EN, UARTDM_CR);
> + msm_hsl_reset(port);
> +
> + data = UARTDM_CR_TX_EN_BMSK;
> + data |= UARTDM_CR_RX_EN_BMSK;
> + /* enable TX & RX */
> + msm_hsl_write(port, data, UARTDM_CR);
> +
> + msm_hsl_write(port, RESET_STALE_INT, UARTDM_CR);
> + /* turn on RX and CTS interrupts */
> + hslp->imr = UARTDM_ISR_RXSTALE_BMSK | UARTDM_ISR_DELTA_CTS_BMSK |
> + UARTDM_ISR_RXLEV_BMSK;
> + msm_hsl_write(port, hslp->imr, UARTDM_IMR);
> + msm_hsl_write(port, 6500, UARTDM_DMRX);
> + msm_hsl_write(port, STALE_EVENT_ENABLE, UARTDM_CR);
> +}
> +
> +static int msm_hsl_startup(struct uart_port *port)
> +{
> + struct msm_hsl_port *hslp = to_hsl_port(port);
> + unsigned int data, rfr_level;
> + int ret;
> + unsigned long flags;
> +
> + snprintf(hslp->name, sizeof(hslp->name),
> + "msm_serial_hsl%d", port->line);
> +
> + if (!(is_console(port)) || (!port->cons) ||
> + (port->cons && (!(port->cons->flags & CON_ENABLED)))) {
> +
> + if (msm_serial_hsl_has_gsbi(port))
> + set_gsbi_uart_func_mode(port);
> + }
> +
> + /*
> + * Set RFR Level as 3/4 of UARTDM FIFO Size
> + * i.e. 48 Words = 192 bytes as Rx FIFO is 64 words ( 256 bytes).
> + */
> + if (port->fifosize > 48)
> + rfr_level = port->fifosize - 16;
> + else
> + rfr_level = port->fifosize;
> +
> + spin_lock_irqsave(&port->lock, flags);
> +
> + /* set automatic RFR level */
> + data = msm_hsl_read(port, UARTDM_MR1);
> + data &= ~UARTDM_MR1_AUTO_RFR_LEVEL1_BMSK;
> + data &= ~UARTDM_MR1_AUTO_RFR_LEVEL0_BMSK;
> + data |= UARTDM_MR1_AUTO_RFR_LEVEL1_BMSK & (rfr_level << 2);
> + data |= UARTDM_MR1_AUTO_RFR_LEVEL0_BMSK & rfr_level;
> + msm_hsl_write(port, data, UARTDM_MR1);
> + spin_unlock_irqrestore(&port->lock, flags);
> +
> + ret = request_irq(port->irq, msm_hsl_irq, IRQF_TRIGGER_HIGH,
> + hslp->name, port);
> + if (ret)
> + dev_err(port->dev, "Failed to request irq\n");
> +
> + return ret;
> +}
> +
> +static void msm_hsl_shutdown(struct uart_port *port)
> +{
> + struct msm_hsl_port *hslp = to_hsl_port(port);
> +
> + hslp->imr = 0;
> + /* disable interrupts */
> + msm_hsl_write(port, 0, UARTDM_IMR);
> +
> + free_irq(port->irq, port);
> +}
> +
> +static void msm_hsl_set_termios(struct uart_port *port,
> + struct ktermios *termios, struct ktermios *old)
> +{
> + unsigned int baud, mr;
> + unsigned long flags;
> +
> + if (!termios->c_cflag)
> + return;
> +
> + /*
> + * Calculate and set baud rate
> + * 300 is the minimum and 4 Mbps is the maximum baud rate
> + * supported by driver.
> + */
> + baud = uart_get_baud_rate(port, termios, old, 200, 4000000);
> +
> + /*
> + * Due to non-availability of 3.2 Mbps baud rate as standard baud rate
> + * with TTY/serial core. Map 200 BAUD to 3.2 Mbps
> + */
> + if (baud == 200)
> + baud = 3200000;
> +
> + spin_lock_irqsave(&port->lock, flags);
> +
> + msm_hsl_set_baud_rate(port, baud);
> +
> + /* calculate parity */
> + mr = msm_hsl_read(port, UARTDM_MR2);
> + mr &= ~UARTDM_MR2_PARITY_MODE_BMSK;
> + if (termios->c_cflag & PARENB) {
> + if (termios->c_cflag & PARODD)
> + mr |= ODD_PARITY;
> + else if (termios->c_cflag & CMSPAR)
> + mr |= SPACE_PARITY;
> + else
> + mr |= EVEN_PARITY;
> + }
> +
> + /* calculate bits per char */
> + mr &= ~UARTDM_MR2_BITS_PER_CHAR_BMSK;
> + switch (termios->c_cflag & CSIZE) {
> + case CS5:
> + mr |= FIVE_BPC;
> + break;
> + case CS6:
> + mr |= SIX_BPC;
> + break;
> + case CS7:
> + mr |= SEVEN_BPC;
> + break;
> + case CS8:
> + default:
> + mr |= EIGHT_BPC;
> + break;
> + }
> +
> + /* calculate stop bits */
> + mr &= ~(STOP_BIT_ONE | STOP_BIT_TWO);
> + if (termios->c_cflag & CSTOPB)
> + mr |= STOP_BIT_TWO;
> + else
> + mr |= STOP_BIT_ONE;
> +
> + /* set parity, bits per char, and stop bit */
> + msm_hsl_write(port, mr, UARTDM_MR2);
> +
> + /* calculate and set hardware flow control */
> + mr = msm_hsl_read(port, UARTDM_MR1);
> + mr &= ~(UARTDM_MR1_CTS_CTL_BMSK | UARTDM_MR1_RX_RDY_CTL_BMSK);
> + if (termios->c_cflag & CRTSCTS) {
> + mr |= UARTDM_MR1_CTS_CTL_BMSK;
> + mr |= UARTDM_MR1_RX_RDY_CTL_BMSK;
> + }
> + msm_hsl_write(port, mr, UARTDM_MR1);
> +
> + /* Configure status bits to ignore based on termio flags. */
> + port->read_status_mask = 0;
> + if (termios->c_iflag & INPCK)
> + port->read_status_mask |= UARTDM_SR_PAR_FRAME_BMSK;
> + if (termios->c_iflag & (BRKINT | PARMRK))
> + port->read_status_mask |= UARTDM_SR_RX_BREAK_BMSK;
> +
> + uart_update_timeout(port, termios->c_cflag, baud);
> +
> + spin_unlock_irqrestore(&port->lock, flags);
> +}
> +
> +static const char *msm_hsl_type(struct uart_port *port)
> +{
> + return "MSM";
> +}
> +
> +static void msm_hsl_release_port(struct uart_port *port)
> +{
> +}
> +
> +static int msm_hsl_request_port(struct uart_port *port)
> +{
> + return 0;
> +}
> +
> +static void msm_hsl_config_port(struct uart_port *port, int flags)
> +{
> + if (flags & UART_CONFIG_TYPE)
> + port->type = PORT_MSM;
> +
> + /* Configure required GSBI based UART protocol. */
> + if (msm_serial_hsl_has_gsbi(port))
> + set_gsbi_uart_func_mode(port);
> +}
> +
> +static int msm_hsl_verify_port(struct uart_port *port,
> + struct serial_struct *ser)
> +{
> + if (ser->type != PORT_UNKNOWN && ser->type != PORT_MSM)
> + return -EINVAL;
> + if (port->irq != ser->irq)
> + return -EINVAL;
> + return 0;
> +}
> +
> +static void msm_hsl_power(struct uart_port *port, unsigned int state,
> + unsigned int oldstate)
> +{
> + struct msm_hsl_port *hslp = to_hsl_port(port);
> + int ret;
> +
> + switch (state) {
> + case UART_PM_STATE_ON:
> + ret = clk_set_rate(hslp->clk, port->uartclk);
> + if (ret)
> + dev_err(port->dev, "Can't change rate to %u\n",
> + port->uartclk);
> + msm_hsl_clock_enable(port, 1);
> + break;
> + case UART_PM_STATE_OFF:
> + msm_hsl_clock_enable(port, 0);
> + break;
> + default:
> + dev_err(port->dev, "Unknown PM state %d\n", state);
> + }
> +}
> +
> +static struct uart_ops msm_hsl_uart_pops = {
> + .tx_empty = msm_hsl_tx_empty,
> + .set_mctrl = msm_hsl_set_mctrl,
> + .get_mctrl = msm_hsl_get_mctrl,
> + .stop_tx = msm_hsl_stop_tx,
> + .start_tx = msm_hsl_start_tx,
> + .stop_rx = msm_hsl_stop_rx,
> + .enable_ms = msm_hsl_enable_ms,
> + .break_ctl = msm_hsl_break_ctl,
> + .startup = msm_hsl_startup,
> + .shutdown = msm_hsl_shutdown,
> + .set_termios = msm_hsl_set_termios,
> + .type = msm_hsl_type,
> + .release_port = msm_hsl_release_port,
> + .request_port = msm_hsl_request_port,
> + .config_port = msm_hsl_config_port,
> + .verify_port = msm_hsl_verify_port,
> + .pm = msm_hsl_power,
> +};
> +
> +#ifdef CONFIG_SERIAL_MSM_HSL_CONSOLE
> +
> +static struct msm_hsl_port *msm_hsl_uart_ports[UART_NR];
> +
> +static void msm_hsl_console_putchar(struct uart_port *port, int ch)
> +{
> + msm_hsl_wait_for_xmitr(port);
> + msm_hsl_write(port, 1, UARTDM_NCF_TX);
> + /*
> + * Dummy read to add 1 AHB clock delay to fix UART hardware bug.
> + * Bug: Delay required on TX-transfer-init. after writing to
> + * NO_CHARS_FOR_TX register.
> + */
> + msm_hsl_read(port, UARTDM_SR);
> + msm_hsl_write(port, ch, UARTDM_TF);
> +}
> +
> +static void msm_hsl_console_write(struct console *co, const char *s,
> + unsigned int count)
> +{
> + struct uart_port *port;
> + struct msm_hsl_port *hslp;
> + int locked;
> +
> + BUG_ON(co->index < 0 || co->index >= UART_NR);
> +
> + hslp = msm_hsl_uart_ports[co->index];
> + port = &hslp->uart;
> +
> + /* not pretty, but we can end up here via various convoluted paths */
> + if (port->sysrq || oops_in_progress)
> + locked = spin_trylock(&port->lock);
> + else {
> + locked = 1;
> + spin_lock(&port->lock);
> + }
> + msm_hsl_write(port, 0, UARTDM_IMR);
> + uart_console_write(port, s, count, msm_hsl_console_putchar);
> + msm_hsl_write(port, hslp->imr, UARTDM_IMR);
> + if (locked == 1)
> + spin_unlock(&port->lock);
> +}
> +
> +static int msm_hsl_console_setup(struct console *co, char *options)
> +{
> + struct uart_port *port;
> + int baud = 0, flow, bits, parity, mr2;
> + int ret;
> +
> + if (co->index >= UART_NR || co->index < 0)
> + return -ENXIO;
> +
> + port = &msm_hsl_uart_ports[co->index]->uart;
> +
> + if (!port->membase)
> + return -ENXIO;
> +
> + port->cons = co;
> +
> + pm_runtime_get_noresume(port->dev);
> +
> +#ifndef CONFIG_PM_RUNTIME
> + msm_hsl_clock_enable(port, 1);
> +#endif
> + pm_runtime_resume(port->dev);
> +
> + if (options)
> + uart_parse_options(options, &baud, &parity, &bits, &flow);
> +
> + bits = 8;
> + parity = 'n';
> + flow = 'n';
> + msm_hsl_write(port, UARTDM_MR2_BITS_PER_CHAR_8 |
> + STOP_BIT_ONE, UARTDM_MR2); /* 8N1 */
> +
> + if (baud < 300 || baud > 115200)
> + baud = 115200;
> +
> + msm_hsl_set_baud_rate(port, baud);
> +
> + ret = uart_set_options(port, co, baud, parity, bits, flow);
> +
> + mr2 = msm_hsl_read(port, UARTDM_MR2);
> + mr2 |= UARTDM_MR2_RX_ERROR_CHAR_OFF;
> + mr2 |= UARTDM_MR2_RX_BREAK_ZERO_CHAR_OFF;
> + msm_hsl_write(port, mr2, UARTDM_MR2);
> +
> + msm_hsl_reset(port);
> + /* Enable transmitter */
> + msm_hsl_write(port, CR_PROTECTION_EN, UARTDM_CR);
> + msm_hsl_write(port, UARTDM_CR_TX_EN_BMSK, UARTDM_CR);
> +
> + msm_hsl_write(port, 1, UARTDM_NCF_TX);
> + msm_hsl_read(port, UARTDM_NCF_TX);
> +
> + dev_dbg(port->dev, "Console setup on port #%d\n", port->line);
> +
> + return ret;
> +}
> +
> +static struct uart_driver msm_hsl_uart_driver;
> +
> +static struct console msm_hsl_console = {
> + .name = "ttyHSL",
> + .write = msm_hsl_console_write,
> + .device = uart_console_device,
> + .setup = msm_hsl_console_setup,
> + .flags = CON_PRINTBUFFER,
> + .index = -1,
> + .data = &msm_hsl_uart_driver,
> +};
> +
> +#define MSM_HSL_CONSOLE (&msm_hsl_console)
> +
> +#else
> +#define MSM_HSL_CONSOLE NULL
> +#endif
> +
> +static struct uart_driver msm_hsl_uart_driver = {
> + .owner = THIS_MODULE,
> + .driver_name = "msm_serial_hsl",
> + .dev_name = "ttyHSL",
> + .nr = UART_NR,
> + .cons = MSM_HSL_CONSOLE,
> +};
> +
> +static struct dentry *debug_base;
> +
> +DEFINE_SIMPLE_ATTRIBUTE(loopback_enable_fops, msm_hsl_loopback_get,
> + msm_hsl_loopback_set, "%llu\n");
> +/*
> + * msm_serial_hsl debugfs node: <debugfs_root>/msm_serial_hsl/loopback.<id>
> + * writing 1 turns on internal loopback mode in HW. Useful for automation
> + * test scripts.
> + * writing 0 disables the internal loopback mode. Default is disabled.
> + */
> +static void msm_hsl_debugfs_init(struct msm_hsl_port *hslp, int id)
> +{
> + char node_name[15];
> +
> + snprintf(node_name, sizeof(node_name), "loopback.%d", id);
> + hslp->loopback_dir = debugfs_create_file(node_name,
> + S_IRUGO | S_IWUSR,
> + debug_base, hslp,
> + &loopback_enable_fops);
> +}
> +
> +static atomic_t msm_serial_hsl_next_id = ATOMIC_INIT(0);
> +
> +static struct of_device_id msm_hsl_match_table[] = {
> + {.compatible = "qcom,msm-lsuart-v14"},
> + { /* Sentinel */ }
> +};
> +
> +MODULE_DEVICE_TABLE(of, msm_hsl_match_table);
> +
> +static int msm_serial_hsl_probe(struct platform_device *pdev)
> +{
> + struct device_node *node = pdev->dev.of_node;
> + struct msm_hsl_port *hslp;
> + struct resource *mem;
> + struct uart_port *port;
> + const struct of_device_id *match;
> + u32 line;
> + int ret;
> +
> + if (pdev->id == -1)
> + pdev->id = atomic_inc_return(&msm_serial_hsl_next_id) - 1;
> +
> + line = pdev->id;
> +
> + /* Use line number from device tree alias if present */
> + if (!node)
> + return -EINVAL;
> +
> + ret = of_alias_get_id(node, "serial");
> + if (ret >= 0)
> + line = ret;
> +
> + if (line < 0 || line >= UART_NR)
> + return -ENXIO;
> +
> + pr_info("detected port #%d (ttyHSL%d)\n", pdev->id, line);
> +
> + hslp = devm_kzalloc(&pdev->dev, sizeof(*hslp), GFP_KERNEL);
> + if (!hslp)
> + return -ENOMEM;
> +
> + port = &hslp->uart;
> + port->dev = &pdev->dev;
> + port->uartclk = 7372800;
> + port->iotype = UPIO_MEM;
> + port->ops = &msm_hsl_uart_pops;
> + port->flags = UPF_BOOT_AUTOCONF;
> + port->fifosize = 64;
> + port->line = line;
> +
> + hslp->clk = devm_clk_get(&pdev->dev, "core_clk");
> + if (IS_ERR(hslp->clk)) {
> + ret = PTR_ERR(hslp->clk);
> + if (ret != -EPROBE_DEFER)
> + dev_err(&pdev->dev, "Error getting core clk\n");
> + return ret;
> + }
> +
> + /*
> + * Interface clock is not required by all UART configurations.
> + * GSBI UART and BLSP UART needs interface clock but Legacy UART
> + * do not require interface clock. Hence, do not fail probe with
> + * iface of_clk_get_by_name failure.
> + */
> + hslp->pclk = devm_clk_get(&pdev->dev, "iface_clk");
> + if (IS_ERR(hslp->pclk)) {
> + ret = PTR_ERR(hslp->pclk);
> + if (ret == -EPROBE_DEFER)
> + return ret;
> + else
> + hslp->pclk = NULL;
> + }
> +
> + hslp->uart_type = LEGACY_HSUART;
> +
> + match = of_match_device(msm_hsl_match_table, &pdev->dev);
> + if (!match) {
> + hslp->regmap = regmap[UARTDM_VERSION_11_13];
> + } else {
> + hslp->regmap = regmap[UARTDM_VERSION_14];
> + /*
> + * BLSP based UART configuration is available with
> + * UARTDM v14 Revision. Hence set uart_type as UART_BLSP.
> + */
> + hslp->uart_type = BLSP_HSUART;
> + }
> +
> + mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "gbsi_mem");
> + if (mem) {
> + hslp->mapped_gsbi = devm_request_and_ioremap(&pdev->dev, mem);
> + if (!hslp->mapped_gsbi)
> + dev_warn(&pdev->dev, "GSBI region already claimed\n");
> + else
> + hslp->uart_type = GSBI_HSUART;
> + }
> +
> + mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "uart_mem");
> + if (!mem) {
> + dev_err(&pdev->dev, "Getting UART mem failed\n");
> + return -ENXIO;
> + }
> +
> + port->mapbase = mem->start;
> +
> + port->irq = platform_get_irq(pdev, 0);
> + if ((int)port->irq < 0) {
> + dev_err(&pdev->dev, "Getting irq failed\n");
> + return -ENXIO;
> + }
> +
> + port->membase = devm_request_and_ioremap(&pdev->dev, mem);
> + if (!port->membase) {
> + dev_err(&pdev->dev, "UART region already claimed\n");
> + return -EADDRNOTAVAIL;
> + }
> +
> + device_set_wakeup_capable(&pdev->dev, 1);
> + platform_set_drvdata(pdev, port);
> + pm_runtime_enable(port->dev);
> +#ifdef CONFIG_SERIAL_MSM_HSL_CONSOLE
> + msm_hsl_uart_ports[line] = hslp;
> +#endif
> + msm_hsl_debugfs_init(hslp, hslp->uart.line);
> +
> + /* Temporarily increase the refcount on the GSBI clock to avoid a race
> + * condition with the earlyprintk handover mechanism.
> + */
> + if (hslp->pclk)
> + clk_prepare_enable(hslp->pclk);
> + ret = uart_add_one_port(&msm_hsl_uart_driver, port);
> + if (hslp->pclk)
> + clk_disable_unprepare(hslp->pclk);
> +
> + if (!ret)
> + platform_set_drvdata(pdev, hslp);
> +
> + return ret;
> +}
> +
> +static int msm_serial_hsl_remove(struct platform_device *pdev)
> +{
> + struct msm_hsl_port *hslp = platform_get_drvdata(pdev);
> + struct uart_port *port;
> +
> + port = &hslp->uart;
> +
> + pm_runtime_put_sync(&pdev->dev);
> + pm_runtime_disable(&pdev->dev);
> +
> + device_set_wakeup_capable(&pdev->dev, 0);
> + platform_set_drvdata(pdev, NULL);
> +
> + uart_remove_one_port(&msm_hsl_uart_driver, port);
> +
> + debugfs_remove(hslp->loopback_dir);
> + return 0;
> +}
> +
> +#ifdef CONFIG_PM
> +static int msm_serial_hsl_suspend(struct device *dev)
> +{
> + struct msm_hsl_port *hslp = dev_get_drvdata(dev);
> + struct uart_port *port;
> +
> + port = &hslp->uart;
> +
> + if (port)
> + return 0;
> +
> + if (is_console(port))
> + msm_hsl_clock_enable(port, 0);
> +
> + uart_suspend_port(&msm_hsl_uart_driver, port);
> + if (device_may_wakeup(dev))
> + enable_irq_wake(port->irq);
> +
> + return 0;
> +}
> +
> +static int msm_serial_hsl_resume(struct device *dev)
> +{
> + struct msm_hsl_port *hslp = dev_get_drvdata(dev);
> + struct uart_port *port;
> +
> + port = &hslp->uart;
> +
> + if (!port)
> + return 0;
> +
> + uart_resume_port(&msm_hsl_uart_driver, port);
> + if (device_may_wakeup(dev))
> + disable_irq_wake(port->irq);
> +
> + if (is_console(port))
> + msm_hsl_clock_enable(port, 1);
> +
> + return 0;
> +}
> +#else
> +#define msm_serial_hsl_suspend NULL
> +#define msm_serial_hsl_resume NULL
> +#endif
> +
> +static int msm_hsl_runtime_suspend(struct device *dev)
> +{
> + struct msm_hsl_port *hslp = dev_get_drvdata(dev);
> + struct uart_port *port;
> +
> + port = &hslp->uart;
> +
> + dev_dbg(dev, "pm_runtime: suspending\n");
> + msm_hsl_clock_enable(port, 0);
> + return 0;
> +}
> +
> +static int msm_hsl_runtime_resume(struct device *dev)
> +{
> + struct msm_hsl_port *hslp = dev_get_drvdata(dev);
> + struct uart_port *port;
> +
> + port = &hslp->uart;
> +
> + dev_dbg(dev, "pm_runtime: resuming\n");
> + msm_hsl_clock_enable(port, 1);
> + return 0;
> +}
> +
> +static const struct dev_pm_ops msm_hsl_dev_pm_ops = {
> + .suspend = msm_serial_hsl_suspend,
> + .resume = msm_serial_hsl_resume,
> + .runtime_suspend = msm_hsl_runtime_suspend,
> + .runtime_resume = msm_hsl_runtime_resume,
> +};
> +
> +static struct platform_driver msm_hsl_platform_driver = {
> + .probe = msm_serial_hsl_probe,
> + .remove = msm_serial_hsl_remove,
> + .driver = {
> + .name = "msm_serial_hsl",
> + .owner = THIS_MODULE,
> + .pm = &msm_hsl_dev_pm_ops,
> + .of_match_table = msm_hsl_match_table,
> + },
> +};
> +
> +static int __init msm_serial_hsl_init(void)
> +{
> + int ret;
> +
> + ret = uart_register_driver(&msm_hsl_uart_driver);
> + if (ret)
> + return ret;
> +
> + debug_base = debugfs_create_dir("msm_serial_hsl", NULL);
> + if (IS_ERR_OR_NULL(debug_base))
> + pr_err("Cannot create debugfs dir\n");
> +
> + ret = platform_driver_register(&msm_hsl_platform_driver);
> + if (ret)
> + uart_unregister_driver(&msm_hsl_uart_driver);
> +
> + pr_debug("Driver initialized\n");
> + return ret;
> +}
> +
> +static void __exit msm_serial_hsl_exit(void)
> +{
> + debugfs_remove_recursive(debug_base);
> +#ifdef CONFIG_SERIAL_MSM_HSL_CONSOLE
> + unregister_console(&msm_hsl_console);
> +#endif
> + platform_driver_unregister(&msm_hsl_platform_driver);
> + uart_unregister_driver(&msm_hsl_uart_driver);
> +}
> +
> +module_init(msm_serial_hsl_init);
> +module_exit(msm_serial_hsl_exit);
> +
> +MODULE_DESCRIPTION("Driver for MSM HSUART UART serial device");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/tty/serial/msm_serial_hsl.h b/drivers/tty/serial/msm_serial_hsl.h
> new file mode 100644
> index 0000000..beb97d4
> --- /dev/null
> +++ b/drivers/tty/serial/msm_serial_hsl.h
> @@ -0,0 +1,294 @@
> +/* drivers/tty/serial/msm_serial_hsl.h
> + *
> + * Copyright (c) 2007-2009, 2012-2013,The Linux Foundation. All rights reserved.
> + *
> + * All source code in this file is licensed under the following license
> + * except where indicated.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> + * See the GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, you can find it at http://www.fsf.org
> + */
> +
> +#ifndef MSM_SERIAL_HSL_H
> +#define MSM_SERIAL_HSL_H
> +
> +#define GSBI_CONTROL_ADDR 0x0
> +#define GSBI_PROTOCOL_CODE_MASK 0x30
> +#define GSBI_PROTOCOL_I2C_UART 0x60
> +#define GSBI_PROTOCOL_UART 0x40
> +#define GSBI_PROTOCOL_IDLE 0x0
> +
> +#define TCSR_ADM_1_A_CRCI_MUX_SEL 0x78
> +#define TCSR_ADM_1_B_CRCI_MUX_SEL 0x7c
> +#define ADM1_CRCI_GSBI6_RX_SEL 0x800
> +#define ADM1_CRCI_GSBI6_TX_SEL 0x400
> +
> +enum msm_hsl_regs {
> + UARTDM_MR1,
> + UARTDM_MR2,
> + UARTDM_IMR,
> + UARTDM_SR,
> + UARTDM_CR,
> + UARTDM_CSR,
> + UARTDM_IPR,
> + UARTDM_ISR,
> + UARTDM_RX_TOTAL_SNAP,
> + UARTDM_RFWR,
> + UARTDM_TFWR,
> + UARTDM_RF,
> + UARTDM_TF,
> + UARTDM_MISR,
> + UARTDM_DMRX,
> + UARTDM_NCF_TX,
> + UARTDM_DMEN,
> + UARTDM_BCR,
> + UARTDM_TXFS,
> + UARTDM_RXFS,
> + UARTDM_LAST,
> +};
> +
> +#define UARTDM_MR1_ADDR 0x0
> +#define UARTDM_MR2_ADDR 0x4
> +
> +/* Backward Compatability Register for UARTDM Core v1.4 */
> +#define UARTDM_BCR_ADDR 0xc8
> +
> +/*
> + * UARTDM Core v1.4 STALE_IRQ_EMPTY bit defination
> + * Stale interrupt will fire if bit is set when RX-FIFO is empty
> + */
> +#define UARTDM_BCR_STALE_IRQ_EMPTY 0x2
> +
> +/* TRANSFER_CONTROL Register for UARTDM Core v1.4 */
> +#define UARTDM_RX_TRANS_CTRL_ADDR 0xcc
> +
> +/* TRANSFER_CONTROL Register bits */
> +#define RX_STALE_AUTO_RE_EN 0x1
> +#define RX_TRANS_AUTO_RE_ACTIVATE 0x2
> +#define RX_DMRX_CYCLIC_EN 0x4
> +
> +/* write only register */
> +#define UARTDM_IPR_ADDR 0x18
> +#define UARTDM_TFWR_ADDR 0x1c
> +#define UARTDM_RFWR_ADDR 0x20
> +#define UARTDM_HCR_ADDR 0x24
> +#define UARTDM_DMRX_ADDR 0x34
> +#define UARTDM_DMEN_ADDR 0x3c
> +
> +/* UART_DM_NO_CHARS_FOR_TX */
> +#define UARTDM_NCF_TX_ADDR 0x40
> +
> +#define UARTDM_BADR_ADDR 0x44
> +
> +#define UARTDM_SIM_CFG_ADDR 0x80
> +
> +/* Read Only register */
> +#define UARTDM_TXFS_ADDR 0x4c
> +#define UARTDM_RXFS_ADDR 0x50
> +
> +/* Register field Mask Mapping */
> +#define UARTDM_SR_RX_BREAK_BMSK BIT(6)
> +#define UARTDM_SR_PAR_FRAME_BMSK BIT(5)
> +#define UARTDM_SR_OVERRUN_BMSK BIT(4)
> +#define UARTDM_SR_TXEMT_BMSK BIT(3)
> +#define UARTDM_SR_TXRDY_BMSK BIT(2)
> +#define UARTDM_SR_RXRDY_BMSK BIT(0)
> +
> +#define UARTDM_CR_TX_DISABLE_BMSK BIT(3)
> +#define UARTDM_CR_RX_DISABLE_BMSK BIT(1)
> +#define UARTDM_CR_TX_EN_BMSK BIT(2)
> +#define UARTDM_CR_RX_EN_BMSK BIT(0)
> +
> +/* UARTDM_CR channel_comman bit value (register field is bits 8:4) */
> +#define RESET_RX 0x10
> +#define RESET_TX 0x20
> +#define RESET_ERROR_STATUS 0x30
> +#define RESET_BREAK_INT 0x40
> +#define START_BREAK 0x50
> +#define STOP_BREAK 0x60
> +#define RESET_CTS 0x70
> +#define RESET_STALE_INT 0x80
> +#define RFR_LOW 0xD0
> +#define RFR_HIGH 0xE0
> +#define CR_PROTECTION_EN 0x100
> +#define STALE_EVENT_ENABLE 0x500
> +#define STALE_EVENT_DISABLE 0x600
> +#define FORCE_STALE_EVENT 0x400
> +#define CLEAR_TX_READY 0x300
> +#define RESET_TX_ERROR 0x800
> +#define RESET_TX_DONE 0x810
> +
> +/*
> + * UARTDM_CR BAM IFC comman bit value
> + * for UARTDM Core v1.4
> + */
> +#define START_RX_BAM_IFC 0x850
> +#define START_TX_BAM_IFC 0x860
> +
> +#define UARTDM_MR1_AUTO_RFR_LEVEL1_BMSK 0xffffff00
> +#define UARTDM_MR1_AUTO_RFR_LEVEL0_BMSK 0x3f
> +#define UARTDM_MR1_CTS_CTL_BMSK 0x40
> +#define UARTDM_MR1_RX_RDY_CTL_BMSK 0x80
> +
> +/*
> + * UARTDM Core v1.4 MR2_RFR_CTS_LOOP bitmask
> + * Enables internal loopback between RFR_N of
> + * RX channel and CTS_N of TX channel.
> + */
> +#define UARTDM_MR2_RFR_CTS_LOOP_MODE_BMSK 0x400
> +
> +#define UARTDM_MR2_LOOP_MODE_BMSK 0x80
> +#define UARTDM_MR2_ERROR_MODE_BMSK 0x40
> +#define UARTDM_MR2_BITS_PER_CHAR_BMSK 0x30
> +#define UARTDM_MR2_RX_ZERO_CHAR_OFF 0x100
> +#define UARTDM_MR2_RX_ERROR_CHAR_OFF 0x200
> +#define UARTDM_MR2_RX_BREAK_ZERO_CHAR_OFF 0x100
> +
> +#define UARTDM_MR2_BITS_PER_CHAR_8 (0x3 << 4)
> +
> +/* bits per character configuration */
> +#define FIVE_BPC (0 << 4)
> +#define SIX_BPC (1 << 4)
> +#define SEVEN_BPC (2 << 4)
> +#define EIGHT_BPC (3 << 4)
> +
> +#define UARTDM_MR2_STOP_BIT_LEN_BMSK 0xc
> +#define STOP_BIT_ONE (1 << 2)
> +#define STOP_BIT_TWO (3 << 2)
> +
> +#define UARTDM_MR2_PARITY_MODE_BMSK 0x3
> +
> +/* Parity configuration */
> +#define NO_PARITY 0x0
> +#define EVEN_PARITY 0x2
> +#define ODD_PARITY 0x1
> +#define SPACE_PARITY 0x3
> +
> +#define UARTDM_IPR_STALE_TIMEOUT_MSB_BMSK 0xffffff80
> +#define UARTDM_IPR_STALE_LSB_BMSK 0x1f
> +
> +/* These can be used for both ISR and IMR register */
> +#define UARTDM_ISR_TX_READY_BMSK BIT(7)
> +#define UARTDM_ISR_CURRENT_CTS_BMSK BIT(6)
> +#define UARTDM_ISR_DELTA_CTS_BMSK BIT(5)
> +#define UARTDM_ISR_RXLEV_BMSK BIT(4)
> +#define UARTDM_ISR_RXSTALE_BMSK BIT(3)
> +#define UARTDM_ISR_RXBREAK_BMSK BIT(2)
> +#define UARTDM_ISR_RXHUNT_BMSK BIT(1)
> +#define UARTDM_ISR_TXLEV_BMSK BIT(0)
> +
> +/* Field definitions for UART_DM_DMEN*/
> +#define UARTDM_TX_DM_EN_BMSK 0x1
> +#define UARTDM_RX_DM_EN_BMSK 0x2
> +
> +/*
> + * UARTDM Core v1.4 bitmask
> + * Bitmasks for enabling Rx and Tx BAM Interface
> + */
> +#define UARTDM_TX_BAM_ENABLE_BMSK 0x4
> +#define UARTDM_RX_BAM_ENABLE_BMSK 0x8
> +
> +/*
> + * Some of the BLSP Based UART Core(v14) existing register offsets
> + * are different compare to GSBI based UART Core(v13)
> + * Hence add the changed register offsets for UART Core v14
> + */
> +
> +/* write only register */
> +#define UARTDM_CSR_ADDR_V14 0xa0
> +
> +/* write only register */
> +#define UARTDM_TF_ADDR_V14 0x100
> +#define UARTDM_TF2_ADDR_V14 0x104
> +#define UARTDM_TF3_ADDR_V14 0x108
> +#define UARTDM_TF4_ADDR_V14 0x10c
> +#define UARTDM_TF5_ADDR_V14 0x110
> +#define UARTDM_TF6_ADDR_V14 0x114
> +#define UARTDM_TF7_ADDR_V14 0x118
> +#define UARTDM_TF8_ADDR_V14 0x11c
> +#define UARTDM_TF9_ADDR_V14 0x120
> +#define UARTDM_TF10_ADDR_V14 0x124
> +#define UARTDM_TF11_ADDR_V14 0x128
> +#define UARTDM_TF12_ADDR_V14 0x12c
> +#define UARTDM_TF13_ADDR_V14 0x130
> +#define UARTDM_TF14_ADDR_V14 0x134
> +#define UARTDM_TF15_ADDR_V14 0x138
> +#define UARTDM_TF16_ADDR_V14 0x13c
> +
> +/* write only register */
> +#define UARTDM_CR_ADDR_V14 0xa8
> +/* write only register */
> +#define UARTDM_IMR_ADDR_V14 0xb0
> +#define UARTDM_IRDA_ADDR_V14 0xb8
> +
> +/* Read Only register */
> +#define UARTDM_SR_ADDR_V14 0xa4
> +
> +/* Read Only register */
> +#define UARTDM_RF_ADDR_V14 0x140
> +#define UARTDM_RF2_ADDR_V14 0x144
> +#define UARTDM_RF3_ADDR_V14 0x148
> +#define UARTDM_RF4_ADDR_V14 0x14c
> +#define UARTDM_RF5_ADDR_V14 0x150
> +#define UARTDM_RF6_ADDR_V14 0x154
> +#define UARTDM_RF7_ADDR_V14 0x158
> +#define UARTDM_RF8_ADDR_V14 0x15c
> +#define UARTDM_RF9_ADDR_V14 0x160
> +#define UARTDM_RF10_ADDR_V14 0x164
> +#define UARTDM_RF11_ADDR_V14 0x168
> +#define UARTDM_RF12_ADDR_V14 0x16c
> +#define UARTDM_RF13_ADDR_V14 0x170
> +#define UARTDM_RF14_ADDR_V14 0x174
> +#define UARTDM_RF15_ADDR_V14 0x178
> +#define UARTDM_RF16_ADDR_V14 0x17c
> +
> +/* Read Only register */
> +#define UARTDM_MISR_ADDR_V14 0xac
> +
> +/* Read Only register */
> +#define UARTDM_ISR_ADDR_V14 0xb4
> +#define UARTDM_RX_TOTAL_SNAP_ADDR_V14 0xbc
> +
> +/* Register offsets for UART Core v13 */
> +
> +/* write only register */
> +#define UARTDM_CSR_ADDR 0x8
> +
> +/* write only register */
> +#define UARTDM_TF_ADDR 0x70
> +#define UARTDM_TF2_ADDR 0x74
> +#define UARTDM_TF3_ADDR 0x78
> +#define UARTDM_TF4_ADDR 0x7c
> +
> +/* write only register */
> +#define UARTDM_CR_ADDR 0x10
> +/* write only register */
> +#define UARTDM_IMR_ADDR 0x14
> +#define UARTDM_IRDA_ADDR 0x38
> +
> +/* Read Only register */
> +#define UARTDM_SR_ADDR 0x8
> +
> +/* Read Only register */
> +#define UARTDM_RF_ADDR 0x70
> +#define UARTDM_RF2_ADDR 0x74
> +#define UARTDM_RF3_ADDR 0x78
> +#define UARTDM_RF4_ADDR 0x7c
> +
> +/* Read Only register */
> +#define UARTDM_MISR_ADDR 0x10
> +
> +/* Read Only register */
> +#define UARTDM_ISR_ADDR 0x14
> +#define UARTDM_RX_TOTAL_SNAP_ADDR 0x38
> +
> +#endif /* MSM_SERIAL_HSL_H */
--
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