On Fri, Jan 12, 2018 at 06:05:47PM -0700, Karthikeyan Ramasubramanian wrote:
> This driver supports GENI based UART Controller in the Qualcomm SOCs. The
> Qualcomm Generic Interface (GENI) is a programmable module supporting a
> wide range of serial interfaces including UART. This driver support console
> operations using FIFO mode of transfer.
>
> Signed-off-by: Girish Mahadevan <girishm@xxxxxxxxxxxxxx>
> Signed-off-by: Karthikeyan Ramasubramanian <kramasub@xxxxxxxxxxxxxx>
> Signed-off-by: Sagar Dharia <sdharia@xxxxxxxxxxxxxx>
> ---
> drivers/tty/serial/Kconfig | 10 +
> drivers/tty/serial/Makefile | 1 +
> drivers/tty/serial/qcom_geni_serial.c | 1414 +++++++++++++++++++++++++++++++++
> 3 files changed, 1425 insertions(+)
> create mode 100644 drivers/tty/serial/qcom_geni_serial.c
>
> diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
> index b788fee..1be30e5 100644
> --- a/drivers/tty/serial/Kconfig
> +++ b/drivers/tty/serial/Kconfig
> @@ -1098,6 +1098,16 @@ config SERIAL_MSM_CONSOLE
> select SERIAL_CORE_CONSOLE
> select SERIAL_EARLYCON
>
> +config SERIAL_QCOM_GENI
> + tristate "QCOM on-chip GENI based serial port support"
> + depends on ARCH_QCOM
> + select SERIAL_CORE
> + select SERIAL_CORE_CONSOLE
Serial console drivers have to be bool, not tristate.
Building a console driver as module doesn't make sense
(it is needed before modules are loaded). It also results
in a build failure due to a symbol which is not exported.
> + select SERIAL_EARLYCON
> + help
> + Serial driver for Qualcomm Technologies Inc's GENI based QUP
> + hardware.
> +
> 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 842d185..64a8d82 100644
> --- a/drivers/tty/serial/Makefile
> +++ b/drivers/tty/serial/Makefile
> @@ -63,6 +63,7 @@ obj-$(CONFIG_SERIAL_SGI_IOC3) += ioc3_serial.o
> obj-$(CONFIG_SERIAL_ATMEL) += atmel_serial.o
> obj-$(CONFIG_SERIAL_UARTLITE) += uartlite.o
> obj-$(CONFIG_SERIAL_MSM) += msm_serial.o
> +obj-$(CONFIG_SERIAL_QCOM_GENI) += qcom_geni_serial.o
> obj-$(CONFIG_SERIAL_NETX) += netx-serial.o
> obj-$(CONFIG_SERIAL_KS8695) += serial_ks8695.o
> obj-$(CONFIG_SERIAL_OMAP) += omap-serial.o
> diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
> new file mode 100644
> index 0000000..0dbd329
> --- /dev/null
> +++ b/drivers/tty/serial/qcom_geni_serial.c
> @@ -0,0 +1,1414 @@
> +/*
> + * Copyright (c) 2017-2018, The Linux foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only 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.
> + */
> +
> +#include <linux/bitmap.h>
> +#include <linux/bitops.h>
> +#include <linux/delay.h>
> +#include <linux/console.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/qcom-geni-se.h>
> +#include <linux/serial.h>
> +#include <linux/serial_core.h>
> +#include <linux/slab.h>
> +#include <linux/tty.h>
> +#include <linux/tty_flip.h>
> +
> +/* UART specific GENI registers */
> +#define SE_UART_TX_TRANS_CFG (0x25C)
> +#define SE_UART_TX_WORD_LEN (0x268)
> +#define SE_UART_TX_STOP_BIT_LEN (0x26C)
> +#define SE_UART_TX_TRANS_LEN (0x270)
> +#define SE_UART_RX_TRANS_CFG (0x280)
> +#define SE_UART_RX_WORD_LEN (0x28C)
> +#define SE_UART_RX_STALE_CNT (0x294)
> +#define SE_UART_TX_PARITY_CFG (0x2A4)
> +#define SE_UART_RX_PARITY_CFG (0x2A8)
> +
> +/* SE_UART_TRANS_CFG */
> +#define UART_TX_PAR_EN (BIT(0))
> +#define UART_CTS_MASK (BIT(1))
> +
> +/* SE_UART_TX_WORD_LEN */
> +#define TX_WORD_LEN_MSK (GENMASK(9, 0))
> +
> +/* SE_UART_TX_STOP_BIT_LEN */
> +#define TX_STOP_BIT_LEN_MSK (GENMASK(23, 0))
> +#define TX_STOP_BIT_LEN_1 (0)
> +#define TX_STOP_BIT_LEN_1_5 (1)
> +#define TX_STOP_BIT_LEN_2 (2)
> +
> +/* SE_UART_TX_TRANS_LEN */
> +#define TX_TRANS_LEN_MSK (GENMASK(23, 0))
> +
> +/* SE_UART_RX_TRANS_CFG */
> +#define UART_RX_INS_STATUS_BIT (BIT(2))
> +#define UART_RX_PAR_EN (BIT(3))
> +
> +/* SE_UART_RX_WORD_LEN */
> +#define RX_WORD_LEN_MASK (GENMASK(9, 0))
> +
> +/* SE_UART_RX_STALE_CNT */
> +#define RX_STALE_CNT (GENMASK(23, 0))
> +
> +/* SE_UART_TX_PARITY_CFG/RX_PARITY_CFG */
> +#define PAR_CALC_EN (BIT(0))
> +#define PAR_MODE_MSK (GENMASK(2, 1))
> +#define PAR_MODE_SHFT (1)
> +#define PAR_EVEN (0x00)
> +#define PAR_ODD (0x01)
> +#define PAR_SPACE (0x10)
> +#define PAR_MARK (0x11)
> +
> +/* UART M_CMD OP codes */
> +#define UART_START_TX (0x1)
> +#define UART_START_BREAK (0x4)
> +#define UART_STOP_BREAK (0x5)
> +/* UART S_CMD OP codes */
> +#define UART_START_READ (0x1)
> +#define UART_PARAM (0x1)
> +
> +#define UART_OVERSAMPLING (32)
> +#define STALE_TIMEOUT (16)
> +#define DEFAULT_BITS_PER_CHAR (10)
> +#define GENI_UART_NR_PORTS (15)
> +#define GENI_UART_CONS_PORTS (1)
> +#define DEF_FIFO_DEPTH_WORDS (16)
> +#define DEF_TX_WM (2)
> +#define DEF_FIFO_WIDTH_BITS (32)
> +#define UART_CORE2X_VOTE (10000)
> +#define UART_CONSOLE_RX_WM (2)
> +
> +static int owr;
> +module_param(owr, int, 0644);
> +
> +struct qcom_geni_serial_port {
> + struct uart_port uport;
> + char name[20];
> + unsigned int tx_fifo_depth;
> + unsigned int tx_fifo_width;
> + unsigned int rx_fifo_depth;
> + unsigned int tx_wm;
> + unsigned int rx_wm;
> + unsigned int rx_rfr;
> + int xfer_mode;
> + bool port_setup;
> + unsigned int *rx_fifo;
> + int (*handle_rx)(struct uart_port *uport,
> + unsigned int rx_fifo_wc,
> + unsigned int rx_last_byte_valid,
> + unsigned int rx_last,
> + bool drop_rx);
> + struct device *wrapper_dev;
> + struct geni_se_rsc serial_rsc;
> + unsigned int xmit_size;
> + void *rx_buf;
> + unsigned int cur_baud;
> +};
> +
> +static const struct uart_ops qcom_geni_serial_pops;
> +static struct uart_driver qcom_geni_console_driver;
> +static int handle_rx_console(struct uart_port *uport,
> + unsigned int rx_fifo_wc,
> + unsigned int rx_last_byte_valid,
> + unsigned int rx_last,
> + bool drop_rx);
> +static unsigned int qcom_geni_serial_tx_empty(struct uart_port *port);
> +static int qcom_geni_serial_poll_bit(struct uart_port *uport,
> + int offset, int bit_field, bool set);
> +static void qcom_geni_serial_stop_rx(struct uart_port *uport);
> +
> +static atomic_t uart_line_id = ATOMIC_INIT(0);
> +
> +#define GET_DEV_PORT(uport) \
> + container_of(uport, struct qcom_geni_serial_port, uport)
> +
> +static struct qcom_geni_serial_port qcom_geni_console_port;
> +
> +static void qcom_geni_serial_config_port(struct uart_port *uport, int cfg_flags)
> +{
> + if (cfg_flags & UART_CONFIG_TYPE)
> + uport->type = PORT_MSM;
> +}
> +
> +static unsigned int qcom_geni_cons_get_mctrl(struct uart_port *uport)
> +{
> + return TIOCM_DSR | TIOCM_CAR | TIOCM_CTS;
> +}
> +
> +static void qcom_geni_cons_set_mctrl(struct uart_port *uport,
> + unsigned int mctrl)
> +{
> +}
> +
> +static const char *qcom_geni_serial_get_type(struct uart_port *uport)
> +{
> + return "MSM";
> +}
> +
> +static struct qcom_geni_serial_port *get_port_from_line(int line)
> +{
> + struct qcom_geni_serial_port *port = NULL;
> +
> + if ((line < 0) || (line >= GENI_UART_CONS_PORTS))
> + port = ERR_PTR(-ENXIO);
> + port = &qcom_geni_console_port;
> + return port;
> +}
> +
> +static int qcom_geni_serial_poll_bit(struct uart_port *uport,
> + int offset, int bit_field, bool set)
> +{
> + int iter = 0;
> + unsigned int reg;
> + bool met = false;
> + struct qcom_geni_serial_port *port = NULL;
> + bool cond = false;
> + unsigned int baud = 115200;
> + unsigned int fifo_bits = DEF_FIFO_DEPTH_WORDS * DEF_FIFO_WIDTH_BITS;
> + unsigned long total_iter = 2000;
> +
> +
> + if (uport->private_data) {
> + port = GET_DEV_PORT(uport);
> + baud = (port->cur_baud ? port->cur_baud : 115200);
> + fifo_bits = port->tx_fifo_depth * port->tx_fifo_width;
> + /*
> + * Total polling iterations based on FIFO worth of bytes to be
> + * sent at current baud .Add a little fluff to the wait.
> + */
> + total_iter = ((fifo_bits * USEC_PER_SEC) / baud) / 10;
> + total_iter += 50;
> + }
> +
> + while (iter < total_iter) {
> + reg = geni_read_reg_nolog(uport->membase, offset);
> + cond = reg & bit_field;
> + if (cond == set) {
> + met = true;
> + break;
> + }
> + udelay(10);
> + iter++;
> + }
> + return met;
> +}
> +
> +static void qcom_geni_serial_setup_tx(struct uart_port *uport,
> + unsigned int xmit_size)
> +{
> + u32 m_cmd = 0;
> +
> + geni_write_reg_nolog(xmit_size, uport->membase, SE_UART_TX_TRANS_LEN);
> + m_cmd |= (UART_START_TX << M_OPCODE_SHFT);
> + geni_write_reg_nolog(m_cmd, uport->membase, SE_GENI_M_CMD0);
> + /*
> + * Writes to enable the primary sequencer should go through before
> + * exiting this function.
> + */
> + mb();
> +}
> +
> +static void qcom_geni_serial_poll_cancel_tx(struct uart_port *uport)
> +{
> + int done = 0;
> + unsigned int irq_clear = M_CMD_DONE_EN;
> + unsigned int geni_status = 0;
> +
> + done = qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
> + M_CMD_DONE_EN, true);
> + if (!done) {
> + geni_write_reg_nolog(M_GENI_CMD_ABORT, uport->membase,
> + SE_GENI_M_CMD_CTRL_REG);
> + owr++;
> + irq_clear |= M_CMD_ABORT_EN;
> + qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
> + M_CMD_ABORT_EN, true);
> + }
> + geni_status = geni_read_reg_nolog(uport->membase,
> + SE_GENI_STATUS);
> + if (geni_status & M_GENI_CMD_ACTIVE)
> + owr++;
> + geni_write_reg_nolog(irq_clear, uport->membase, SE_GENI_M_IRQ_CLEAR);
> +}
> +
> +static void qcom_geni_serial_abort_rx(struct uart_port *uport)
> +{
> + unsigned int irq_clear = S_CMD_DONE_EN;
> +
> + geni_se_abort_s_cmd(uport->membase);
> + /* Ensure this goes through before polling. */
> + mb();
> + irq_clear |= S_CMD_ABORT_EN;
> + qcom_geni_serial_poll_bit(uport, SE_GENI_S_CMD_CTRL_REG,
> + S_GENI_CMD_ABORT, false);
> + geni_write_reg_nolog(irq_clear, uport->membase, SE_GENI_S_IRQ_CLEAR);
> + geni_write_reg(FORCE_DEFAULT, uport->membase, GENI_FORCE_DEFAULT_REG);
> +}
> +
> +#ifdef CONFIG_CONSOLE_POLL
> +static int qcom_geni_serial_get_char(struct uart_port *uport)
> +{
> + unsigned int rx_fifo;
> + unsigned int m_irq_status;
> + unsigned int s_irq_status;
> +
> + if (!(qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
> + M_SEC_IRQ_EN, true)))
> + return -ENXIO;
> +
> + m_irq_status = geni_read_reg_nolog(uport->membase,
> + SE_GENI_M_IRQ_STATUS);
> + s_irq_status = geni_read_reg_nolog(uport->membase,
> + SE_GENI_S_IRQ_STATUS);
> + geni_write_reg_nolog(m_irq_status, uport->membase,
> + SE_GENI_M_IRQ_CLEAR);
> + geni_write_reg_nolog(s_irq_status, uport->membase,
> + SE_GENI_S_IRQ_CLEAR);
> +
> + if (!(qcom_geni_serial_poll_bit(uport, SE_GENI_RX_FIFO_STATUS,
> + RX_FIFO_WC_MSK, true)))
> + return -ENXIO;
> +
> + /*
> + * Read the Rx FIFO only after clearing the interrupt registers and
> + * getting valid RX fifo status.
> + */
> + mb();
> + rx_fifo = geni_read_reg_nolog(uport->membase, SE_GENI_RX_FIFOn);
> + rx_fifo &= 0xFF;
> + return rx_fifo;
> +}
> +
> +static void qcom_geni_serial_poll_put_char(struct uart_port *uport,
> + unsigned char c)
> +{
> + int b = (int) c;
> + struct qcom_geni_serial_port *port = GET_DEV_PORT(uport);
> +
> + geni_write_reg_nolog(port->tx_wm, uport->membase,
> + SE_GENI_TX_WATERMARK_REG);
> + qcom_geni_serial_setup_tx(uport, 1);
> + if (!qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
> + M_TX_FIFO_WATERMARK_EN, true))
> + WARN_ON(1);
> + geni_write_reg_nolog(b, uport->membase, SE_GENI_TX_FIFOn);
> + geni_write_reg_nolog(M_TX_FIFO_WATERMARK_EN, uport->membase,
> + SE_GENI_M_IRQ_CLEAR);
> + /*
> + * Ensure FIFO write goes through before polling for status but.
> + */
> + mb();
> + qcom_geni_serial_poll_cancel_tx(uport);
> +}
> +#endif
> +
> +#if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL)
"if defined(CONFIG_SERIAL_CORE_CONSOLE)" doesn't make much sense here
since the Kconfig entry selects it. Given that, the entire conditional
is unnecessary since it will always be true.
> +static void qcom_geni_serial_wr_char(struct uart_port *uport, int ch)
> +{
> + geni_write_reg_nolog(ch, uport->membase, SE_GENI_TX_FIFOn);
> + /*
> + * Ensure FIFO write clear goes through before
> + * next iteration.
> + */
> + mb();
> +
> +}
> +
> +static void
> +__qcom_geni_serial_console_write(struct uart_port *uport, const char *s,
> + unsigned int count)
> +{
> + int new_line = 0;
> + int i;
> + int bytes_to_send = count;
> + int fifo_depth = DEF_FIFO_DEPTH_WORDS;
> + int tx_wm = DEF_TX_WM;
> +
> + for (i = 0; i < count; i++) {
> + if (s[i] == '\n')
> + new_line++;
> + }
> +
> + bytes_to_send += new_line;
> + geni_write_reg_nolog(tx_wm, uport->membase,
> + SE_GENI_TX_WATERMARK_REG);
> + qcom_geni_serial_setup_tx(uport, bytes_to_send);
> + i = 0;
> + while (i < count) {
> + u32 chars_to_write = 0;
> + u32 avail_fifo_bytes = (fifo_depth - tx_wm);
> +
> + /*
> + * If the WM bit never set, then the Tx state machine is not
> + * in a valid state, so break, cancel/abort any existing
> + * command. Unfortunately the current data being written is
> + * lost.
> + */
> + while (!qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
> + M_TX_FIFO_WATERMARK_EN, true))
> + break;
> + chars_to_write = min((unsigned int)(count - i),
> + avail_fifo_bytes);
> + if ((chars_to_write << 1) > avail_fifo_bytes)
> + chars_to_write = (avail_fifo_bytes >> 1);
> + uart_console_write(uport, (s + i), chars_to_write,
> + qcom_geni_serial_wr_char);
> + geni_write_reg_nolog(M_TX_FIFO_WATERMARK_EN, uport->membase,
> + SE_GENI_M_IRQ_CLEAR);
> + /* Ensure this goes through before polling for WM IRQ again.*/
> + mb();
> + i += chars_to_write;
> + }
> + qcom_geni_serial_poll_cancel_tx(uport);
> +}
> +
> +static void qcom_geni_serial_console_write(struct console *co, const char *s,
> + unsigned int count)
> +{
> + struct uart_port *uport;
> + struct qcom_geni_serial_port *port;
> + int locked = 1;
> + unsigned long flags;
> +
> + WARN_ON(co->index < 0 || co->index >= GENI_UART_NR_PORTS);
> +
> + port = get_port_from_line(co->index);
> + if (IS_ERR_OR_NULL(port))
> + return;
> +
> + uport = &port->uport;
> + if (oops_in_progress)
> + locked = spin_trylock_irqsave(&uport->lock, flags);
> + else
> + spin_lock_irqsave(&uport->lock, flags);
> +
> + if (locked) {
> + __qcom_geni_serial_console_write(uport, s, count);
> + spin_unlock_irqrestore(&uport->lock, flags);
> + }
> +}
> +
> +static int handle_rx_console(struct uart_port *uport,
> + unsigned int rx_fifo_wc,
> + unsigned int rx_last_byte_valid,
> + unsigned int rx_last,
> + bool drop_rx)
> +{
> + int i, c;
> + unsigned char *rx_char;
> + struct tty_port *tport;
> + struct qcom_geni_serial_port *qcom_port = GET_DEV_PORT(uport);
> +
> + tport = &uport->state->port;
> + for (i = 0; i < rx_fifo_wc; i++) {
> + int bytes = 4;
> +
> + *(qcom_port->rx_fifo) =
> + geni_read_reg_nolog(uport->membase, SE_GENI_RX_FIFOn);
> + if (drop_rx)
> + continue;
> + rx_char = (unsigned char *)qcom_port->rx_fifo;
> +
> + if (i == (rx_fifo_wc - 1)) {
> + if (rx_last && rx_last_byte_valid)
> + bytes = rx_last_byte_valid;
> + }
> + for (c = 0; c < bytes; c++) {
> + char flag = TTY_NORMAL;
> + int sysrq;
> +
> + uport->icount.rx++;
> + sysrq = uart_handle_sysrq_char(uport, rx_char[c]);
> + if (!sysrq)
> + tty_insert_flip_char(tport, rx_char[c], flag);
> + }
> + }
> + if (!drop_rx)
> + tty_flip_buffer_push(tport);
> + return 0;
> +}
> +#else
> +static int handle_rx_console(struct uart_port *uport,
> + unsigned int rx_fifo_wc,
> + unsigned int rx_last_byte_valid,
> + unsigned int rx_last,
> + bool drop_rx)
> +{
> + return -EPERM;
> +}
> +
> +#endif /* (CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL)) */
> +
> +static void qcom_geni_serial_start_tx(struct uart_port *uport)
> +{
> + unsigned int geni_m_irq_en;
> + struct qcom_geni_serial_port *qcom_port = GET_DEV_PORT(uport);
> + unsigned int geni_status;
> +
> + if (qcom_port->xfer_mode == FIFO_MODE) {
> + geni_status = geni_read_reg_nolog(uport->membase,
> + SE_GENI_STATUS);
> + if (geni_status & M_GENI_CMD_ACTIVE)
> + goto exit_start_tx;
> +
> + if (!qcom_geni_serial_tx_empty(uport))
> + goto exit_start_tx;
> +
> + geni_m_irq_en = geni_read_reg_nolog(uport->membase,
> + SE_GENI_M_IRQ_EN);
> + geni_m_irq_en |= (M_TX_FIFO_WATERMARK_EN | M_CMD_DONE_EN);
> +
> + geni_write_reg_nolog(qcom_port->tx_wm, uport->membase,
> + SE_GENI_TX_WATERMARK_REG);
> + geni_write_reg_nolog(geni_m_irq_en, uport->membase,
> + SE_GENI_M_IRQ_EN);
> + /* Geni command setup should complete before returning.*/
> + mb();
> + }
> +exit_start_tx:
> + return;
> +}
> +
> +static void stop_tx_sequencer(struct uart_port *uport)
> +{
> + unsigned int geni_m_irq_en;
> + unsigned int geni_status;
> + struct qcom_geni_serial_port *port = GET_DEV_PORT(uport);
> +
> + geni_m_irq_en = geni_read_reg_nolog(uport->membase, SE_GENI_M_IRQ_EN);
> + geni_m_irq_en &= ~M_CMD_DONE_EN;
> + if (port->xfer_mode == FIFO_MODE) {
> + geni_m_irq_en &= ~M_TX_FIFO_WATERMARK_EN;
> + geni_write_reg_nolog(0, uport->membase,
> + SE_GENI_TX_WATERMARK_REG);
> + }
> + port->xmit_size = 0;
> + geni_write_reg_nolog(geni_m_irq_en, uport->membase, SE_GENI_M_IRQ_EN);
> + geni_status = geni_read_reg_nolog(uport->membase,
> + SE_GENI_STATUS);
> + /* Possible stop tx is called multiple times. */
> + if (!(geni_status & M_GENI_CMD_ACTIVE))
> + return;
> +
> + geni_se_cancel_m_cmd(uport->membase);
> + if (!qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
> + M_CMD_CANCEL_EN, true)) {
> + geni_se_abort_m_cmd(uport->membase);
> + qcom_geni_serial_poll_bit(uport, SE_GENI_M_IRQ_STATUS,
> + M_CMD_ABORT_EN, true);
> + geni_write_reg_nolog(M_CMD_ABORT_EN, uport->membase,
> + SE_GENI_M_IRQ_CLEAR);
> + }
> + geni_write_reg_nolog(M_CMD_CANCEL_EN, uport, SE_GENI_M_IRQ_CLEAR);
> +}
> +
> +static void qcom_geni_serial_stop_tx(struct uart_port *uport)
> +{
> + stop_tx_sequencer(uport);
> +}
> +
> +static void start_rx_sequencer(struct uart_port *uport)
> +{
> + unsigned int geni_s_irq_en;
> + unsigned int geni_m_irq_en;
> + unsigned int geni_status;
> + struct qcom_geni_serial_port *port = GET_DEV_PORT(uport);
> +
> + geni_status = geni_read_reg_nolog(uport->membase, SE_GENI_STATUS);
> + if (geni_status & S_GENI_CMD_ACTIVE)
> + qcom_geni_serial_stop_rx(uport);
> +
> + geni_se_setup_s_cmd(uport->membase, UART_START_READ, 0);
> +
> + if (port->xfer_mode == FIFO_MODE) {
> + geni_s_irq_en = geni_read_reg_nolog(uport->membase,
> + SE_GENI_S_IRQ_EN);
> + geni_m_irq_en = geni_read_reg_nolog(uport->membase,
> + SE_GENI_M_IRQ_EN);
> +
> + geni_s_irq_en |= S_RX_FIFO_WATERMARK_EN | S_RX_FIFO_LAST_EN;
> + geni_m_irq_en |= M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN;
> +
> + geni_write_reg_nolog(geni_s_irq_en, uport->membase,
> + SE_GENI_S_IRQ_EN);
> + geni_write_reg_nolog(geni_m_irq_en, uport->membase,
> + SE_GENI_M_IRQ_EN);
> + }
> + /*
> + * Ensure the writes to the secondary sequencer and interrupt enables
> + * go through.
> + */
> + mb();
> + geni_status = geni_read_reg_nolog(uport->membase, SE_GENI_STATUS);
> +}
> +
> +static void qcom_geni_serial_start_rx(struct uart_port *uport)
> +{
> + start_rx_sequencer(uport);
> +}
> +
> +static void stop_rx_sequencer(struct uart_port *uport)
> +{
> + unsigned int geni_s_irq_en;
> + unsigned int geni_m_irq_en;
> + unsigned int geni_status;
> + struct qcom_geni_serial_port *port = GET_DEV_PORT(uport);
> + u32 irq_clear = S_CMD_DONE_EN;
> + bool done;
> +
> + if (port->xfer_mode == FIFO_MODE) {
> + geni_s_irq_en = geni_read_reg_nolog(uport->membase,
> + SE_GENI_S_IRQ_EN);
> + geni_m_irq_en = geni_read_reg_nolog(uport->membase,
> + SE_GENI_M_IRQ_EN);
> + geni_s_irq_en &= ~(S_RX_FIFO_WATERMARK_EN | S_RX_FIFO_LAST_EN);
> + geni_m_irq_en &= ~(M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN);
> +
> + geni_write_reg_nolog(geni_s_irq_en, uport->membase,
> + SE_GENI_S_IRQ_EN);
> + geni_write_reg_nolog(geni_m_irq_en, uport->membase,
> + SE_GENI_M_IRQ_EN);
> + }
> +
> + geni_status = geni_read_reg_nolog(uport->membase, SE_GENI_STATUS);
> + /* Possible stop rx is called multiple times. */
> + if (!(geni_status & S_GENI_CMD_ACTIVE))
> + return;
> + geni_se_cancel_s_cmd(uport->membase);
> + /*
> + * Ensure that the cancel goes through before polling for the
> + * cancel control bit.
> + */
> + mb();
> + done = qcom_geni_serial_poll_bit(uport, SE_GENI_S_CMD_CTRL_REG,
> + S_GENI_CMD_CANCEL, false);
> + geni_status = geni_read_reg_nolog(uport->membase, SE_GENI_STATUS);
> + geni_write_reg_nolog(irq_clear, uport->membase, SE_GENI_S_IRQ_CLEAR);
> + if ((geni_status & S_GENI_CMD_ACTIVE))
> + qcom_geni_serial_abort_rx(uport);
> +}
> +
> +static void qcom_geni_serial_stop_rx(struct uart_port *uport)
> +{
> + stop_rx_sequencer(uport);
> +}
> +
> +static int qcom_geni_serial_handle_rx(struct uart_port *uport, bool drop_rx)
> +{
> + int ret = 0;
> + unsigned int rx_fifo_status;
> + unsigned int rx_fifo_wc = 0;
> + unsigned int rx_last_byte_valid = 0;
> + unsigned int rx_last = 0;
> + struct tty_port *tport;
> + struct qcom_geni_serial_port *port = GET_DEV_PORT(uport);
> +
> + tport = &uport->state->port;
> + rx_fifo_status = geni_read_reg_nolog(uport->membase,
> + SE_GENI_RX_FIFO_STATUS);
> + rx_fifo_wc = rx_fifo_status & RX_FIFO_WC_MSK;
> + rx_last_byte_valid = ((rx_fifo_status & RX_LAST_BYTE_VALID_MSK) >>
> + RX_LAST_BYTE_VALID_SHFT);
> + rx_last = rx_fifo_status & RX_LAST;
> + if (rx_fifo_wc)
> + port->handle_rx(uport, rx_fifo_wc, rx_last_byte_valid,
> + rx_last, drop_rx);
> + return ret;
> +}
> +
> +static int qcom_geni_serial_handle_tx(struct uart_port *uport)
> +{
> + int ret = 0;
> + struct qcom_geni_serial_port *qcom_port = GET_DEV_PORT(uport);
> + struct circ_buf *xmit = &uport->state->xmit;
> + unsigned int avail_fifo_bytes = 0;
> + unsigned int bytes_remaining = 0;
> + int i = 0;
> + unsigned int tx_fifo_status;
> + unsigned int xmit_size;
> + unsigned int fifo_width_bytes = 1;
> + int temp_tail = 0;
> +
> + xmit_size = uart_circ_chars_pending(xmit);
> + tx_fifo_status = geni_read_reg_nolog(uport->membase,
> + SE_GENI_TX_FIFO_STATUS);
> + /* Both FIFO and framework buffer are drained */
> + if ((xmit_size == qcom_port->xmit_size) && !tx_fifo_status) {
> + qcom_port->xmit_size = 0;
> + uart_circ_clear(xmit);
> + qcom_geni_serial_stop_tx(uport);
> + goto exit_handle_tx;
> + }
> + xmit_size -= qcom_port->xmit_size;
> +
> + avail_fifo_bytes = (qcom_port->tx_fifo_depth - qcom_port->tx_wm) *
> + fifo_width_bytes;
> + temp_tail = (xmit->tail + qcom_port->xmit_size) & (UART_XMIT_SIZE - 1);
> + if (xmit_size > (UART_XMIT_SIZE - temp_tail))
> + xmit_size = (UART_XMIT_SIZE - temp_tail);
> + if (xmit_size > avail_fifo_bytes)
> + xmit_size = avail_fifo_bytes;
> +
> + if (!xmit_size)
> + goto exit_handle_tx;
> +
> + qcom_geni_serial_setup_tx(uport, xmit_size);
> +
> + bytes_remaining = xmit_size;
> + while (i < xmit_size) {
> + unsigned int tx_bytes;
> + unsigned int buf = 0;
> + int c;
> +
> + tx_bytes = ((bytes_remaining < fifo_width_bytes) ?
> + bytes_remaining : fifo_width_bytes);
> +
> + for (c = 0; c < tx_bytes ; c++)
> + buf |= (xmit->buf[temp_tail + c] << (c * 8));
> + geni_write_reg_nolog(buf, uport->membase, SE_GENI_TX_FIFOn);
> + i += tx_bytes;
> + temp_tail = (temp_tail + tx_bytes) & (UART_XMIT_SIZE - 1);
> + uport->icount.tx += tx_bytes;
> + bytes_remaining -= tx_bytes;
> + /* Ensure FIFO write goes through */
> + wmb();
> + }
> + qcom_geni_serial_poll_cancel_tx(uport);
> + qcom_port->xmit_size += xmit_size;
> +exit_handle_tx:
> + uart_write_wakeup(uport);
> + return ret;
> +}
> +
> +static irqreturn_t qcom_geni_serial_isr(int isr, void *dev)
> +{
> + unsigned int m_irq_status;
> + unsigned int s_irq_status;
> + struct uart_port *uport = dev;
> + unsigned long flags;
> + unsigned int m_irq_en;
> + bool drop_rx = false;
> + struct tty_port *tport = &uport->state->port;
> +
> + spin_lock_irqsave(&uport->lock, flags);
> + if (uport->suspended)
> + goto exit_geni_serial_isr;
> + m_irq_status = geni_read_reg_nolog(uport->membase,
> + SE_GENI_M_IRQ_STATUS);
> + s_irq_status = geni_read_reg_nolog(uport->membase,
> + SE_GENI_S_IRQ_STATUS);
> + m_irq_en = geni_read_reg_nolog(uport->membase, SE_GENI_M_IRQ_EN);
> + geni_write_reg_nolog(m_irq_status, uport->membase, SE_GENI_M_IRQ_CLEAR);
> + geni_write_reg_nolog(s_irq_status, uport->membase, SE_GENI_S_IRQ_CLEAR);
> +
> + if ((m_irq_status & M_ILLEGAL_CMD_EN)) {
> + WARN_ON(1);
> + goto exit_geni_serial_isr;
> + }
> +
> + if (s_irq_status & S_RX_FIFO_WR_ERR_EN) {
> + uport->icount.overrun++;
> + tty_insert_flip_char(tport, 0, TTY_OVERRUN);
> + }
> +
> + if ((m_irq_status & m_irq_en) &
> + (M_TX_FIFO_WATERMARK_EN | M_CMD_DONE_EN))
> + qcom_geni_serial_handle_tx(uport);
> +
> + if ((s_irq_status & S_GP_IRQ_0_EN) || (s_irq_status & S_GP_IRQ_1_EN)) {
> + if (s_irq_status & S_GP_IRQ_0_EN)
> + uport->icount.parity++;
> + drop_rx = true;
> + } else if ((s_irq_status & S_GP_IRQ_2_EN) ||
> + (s_irq_status & S_GP_IRQ_3_EN)) {
> + uport->icount.brk++;
> + }
> +
> + if ((s_irq_status & S_RX_FIFO_WATERMARK_EN) ||
> + (s_irq_status & S_RX_FIFO_LAST_EN))
> + qcom_geni_serial_handle_rx(uport, drop_rx);
> +
> +exit_geni_serial_isr:
> + spin_unlock_irqrestore(&uport->lock, flags);
> + return IRQ_HANDLED;
> +}
> +
> +static int get_tx_fifo_size(struct qcom_geni_serial_port *port)
> +{
> + struct uart_port *uport;
> +
> + if (!port)
> + return -ENODEV;
> +
> + uport = &port->uport;
> + port->tx_fifo_depth = geni_se_get_tx_fifo_depth(uport->membase);
> + if (!port->tx_fifo_depth) {
> + dev_err(uport->dev, "%s:Invalid TX FIFO depth read\n",
> + __func__);
> + return -ENXIO;
> + }
> +
> + port->tx_fifo_width = geni_se_get_tx_fifo_width(uport->membase);
> + if (!port->tx_fifo_width) {
> + dev_err(uport->dev, "%s:Invalid TX FIFO width read\n",
> + __func__);
> + return -ENXIO;
> + }
> +
> + port->rx_fifo_depth = geni_se_get_rx_fifo_depth(uport->membase);
> + if (!port->rx_fifo_depth) {
> + dev_err(uport->dev, "%s:Invalid RX FIFO depth read\n",
> + __func__);
> + return -ENXIO;
> + }
> +
> + uport->fifosize =
> + ((port->tx_fifo_depth * port->tx_fifo_width) >> 3);
> + return 0;
> +}
> +
> +static void set_rfr_wm(struct qcom_geni_serial_port *port)
> +{
> + /*
> + * Set RFR (Flow off) to FIFO_DEPTH - 2.
> + * RX WM level at 10% RX_FIFO_DEPTH.
> + * TX WM level at 10% TX_FIFO_DEPTH.
> + */
> + port->rx_rfr = port->rx_fifo_depth - 2;
> + port->rx_wm = UART_CONSOLE_RX_WM;
> + port->tx_wm = 2;
> +}
> +
> +static void qcom_geni_serial_shutdown(struct uart_port *uport)
> +{
> + unsigned long flags;
> +
> + /* Stop the console before stopping the current tx */
> + console_stop(uport->cons);
> +
> + disable_irq(uport->irq);
> + free_irq(uport->irq, uport);
> + spin_lock_irqsave(&uport->lock, flags);
> + qcom_geni_serial_stop_tx(uport);
> + qcom_geni_serial_stop_rx(uport);
> + spin_unlock_irqrestore(&uport->lock, flags);
> +}
> +
> +static int qcom_geni_serial_port_setup(struct uart_port *uport)
> +{
> + int ret = 0;
> + struct qcom_geni_serial_port *qcom_port = GET_DEV_PORT(uport);
> + unsigned long cfg0, cfg1;
> + unsigned int rxstale = DEFAULT_BITS_PER_CHAR * STALE_TIMEOUT;
> +
> + set_rfr_wm(qcom_port);
> + geni_write_reg_nolog(rxstale, uport->membase, SE_UART_RX_STALE_CNT);
> + /*
> + * Make an unconditional cancel on the main sequencer to reset
> + * it else we could end up in data loss scenarios.
> + */
> + qcom_port->xfer_mode = FIFO_MODE;
> + qcom_geni_serial_poll_cancel_tx(uport);
> + geni_se_get_packing_config(8, 1, false, &cfg0, &cfg1);
> + geni_write_reg_nolog(cfg0, uport->membase,
> + SE_GENI_TX_PACKING_CFG0);
> + geni_write_reg_nolog(cfg1, uport->membase,
> + SE_GENI_TX_PACKING_CFG1);
> + geni_se_get_packing_config(8, 4, false, &cfg0, &cfg1);
> + geni_write_reg_nolog(cfg0, uport->membase,
> + SE_GENI_RX_PACKING_CFG0);
> + geni_write_reg_nolog(cfg1, uport->membase,
> + SE_GENI_RX_PACKING_CFG1);
> + ret = geni_se_init(uport->membase, qcom_port->rx_wm, qcom_port->rx_rfr);
> + if (ret) {
> + dev_err(uport->dev, "%s: Fail\n", __func__);
> + goto exit_portsetup;
> + }
> +
> + ret = geni_se_select_mode(uport->membase, qcom_port->xfer_mode);
> + if (ret)
> + goto exit_portsetup;
> +
> + qcom_port->port_setup = true;
> + /*
> + * Ensure Port setup related IO completes before returning to
> + * framework.
> + */
> + mb();
> +exit_portsetup:
> + return ret;
> +}
> +
> +static int qcom_geni_serial_startup(struct uart_port *uport)
> +{
> + int ret = 0;
> + struct qcom_geni_serial_port *qcom_port = GET_DEV_PORT(uport);
> +
> + scnprintf(qcom_port->name, sizeof(qcom_port->name),
> + "qcom_serial_geni%d", uport->line);
> +
> + if (unlikely(geni_se_get_proto(uport->membase) != UART)) {
> + dev_err(uport->dev, "%s: Invalid FW %d loaded.\n",
> + __func__, geni_se_get_proto(uport->membase));
> + ret = -ENXIO;
> + goto exit_startup;
> + }
> +
> + get_tx_fifo_size(qcom_port);
> + if (!qcom_port->port_setup) {
> + if (qcom_geni_serial_port_setup(uport))
> + goto exit_startup;
> + }
> +
> + /*
> + * Ensure that all the port configuration writes complete
> + * before returning to the framework.
> + */
> + mb();
> + ret = request_irq(uport->irq, qcom_geni_serial_isr, IRQF_TRIGGER_HIGH,
> + qcom_port->name, uport);
> + if (unlikely(ret)) {
> + dev_err(uport->dev, "%s: Failed to get IRQ ret %d\n",
> + __func__, ret);
> + goto exit_startup;
> + }
> +
> +exit_startup:
> + return ret;
> +}
> +
> +static int get_clk_cfg(unsigned long clk_freq, unsigned long *ser_clk)
> +{
> + unsigned long root_freq[] = {7372800, 14745600, 19200000, 29491200,
> + 32000000, 48000000, 64000000, 80000000, 96000000, 100000000};
> + int i;
> + int match = -1;
> +
> + for (i = 0; i < ARRAY_SIZE(root_freq); i++) {
> + if (clk_freq > root_freq[i])
> + continue;
> +
> + if (!(root_freq[i] % clk_freq)) {
> + match = i;
> + break;
> + }
> + }
> + if (match != -1)
> + *ser_clk = root_freq[match];
> + else
> + pr_err("clk_freq %ld\n", clk_freq);
> + return match;
> +}
> +
> +static void geni_serial_write_term_regs(struct uart_port *uport,
> + u32 tx_trans_cfg, u32 tx_parity_cfg, u32 rx_trans_cfg,
> + u32 rx_parity_cfg, u32 bits_per_char, u32 stop_bit_len,
> + u32 s_clk_cfg)
> +{
> + geni_write_reg_nolog(tx_trans_cfg, uport->membase,
> + SE_UART_TX_TRANS_CFG);
> + geni_write_reg_nolog(tx_parity_cfg, uport->membase,
> + SE_UART_TX_PARITY_CFG);
> + geni_write_reg_nolog(rx_trans_cfg, uport->membase,
> + SE_UART_RX_TRANS_CFG);
> + geni_write_reg_nolog(rx_parity_cfg, uport->membase,
> + SE_UART_RX_PARITY_CFG);
> + geni_write_reg_nolog(bits_per_char, uport->membase,
> + SE_UART_TX_WORD_LEN);
> + geni_write_reg_nolog(bits_per_char, uport->membase,
> + SE_UART_RX_WORD_LEN);
> + geni_write_reg_nolog(stop_bit_len, uport->membase,
> + SE_UART_TX_STOP_BIT_LEN);
> + geni_write_reg_nolog(s_clk_cfg, uport->membase, GENI_SER_M_CLK_CFG);
> + geni_write_reg_nolog(s_clk_cfg, uport->membase, GENI_SER_S_CLK_CFG);
> +}
> +
> +static int get_clk_div_rate(unsigned int baud, unsigned long *desired_clk_rate)
> +{
> + unsigned long ser_clk;
> + int dfs_index;
> + int clk_div = 0;
> +
> + *desired_clk_rate = baud * UART_OVERSAMPLING;
> + dfs_index = get_clk_cfg(*desired_clk_rate, &ser_clk);
> + if (dfs_index < 0) {
> + pr_err("%s: Can't find matching DFS entry for baud %d\n",
> + __func__, baud);
> + clk_div = -EINVAL;
> + goto exit_get_clk_div_rate;
> + }
> +
> + clk_div = ser_clk / *desired_clk_rate;
> + *desired_clk_rate = ser_clk;
> +exit_get_clk_div_rate:
> + return clk_div;
> +}
> +
> +static void qcom_geni_serial_set_termios(struct uart_port *uport,
> + struct ktermios *termios, struct ktermios *old)
> +{
> + unsigned int baud;
> + unsigned int bits_per_char = 0;
> + unsigned int tx_trans_cfg;
> + unsigned int tx_parity_cfg;
> + unsigned int rx_trans_cfg;
> + unsigned int rx_parity_cfg;
> + unsigned int stop_bit_len;
> + unsigned int clk_div;
> + unsigned long ser_clk_cfg = 0;
> + struct qcom_geni_serial_port *port = GET_DEV_PORT(uport);
> + unsigned long clk_rate;
> +
> + qcom_geni_serial_stop_rx(uport);
> + /* baud rate */
> + baud = uart_get_baud_rate(uport, termios, old, 300, 4000000);
> + port->cur_baud = baud;
> + clk_div = get_clk_div_rate(baud, &clk_rate);
> + if (clk_div <= 0)
> + goto exit_set_termios;
> +
> + uport->uartclk = clk_rate;
> + clk_set_rate(port->serial_rsc.se_clk, clk_rate);
> + ser_clk_cfg |= SER_CLK_EN;
> + ser_clk_cfg |= (clk_div << CLK_DIV_SHFT);
> +
> + /* parity */
> + tx_trans_cfg = geni_read_reg_nolog(uport->membase,
> + SE_UART_TX_TRANS_CFG);
> + tx_parity_cfg = geni_read_reg_nolog(uport->membase,
> + SE_UART_TX_PARITY_CFG);
> + rx_trans_cfg = geni_read_reg_nolog(uport->membase,
> + SE_UART_RX_TRANS_CFG);
> + rx_parity_cfg = geni_read_reg_nolog(uport->membase,
> + SE_UART_RX_PARITY_CFG);
> + if (termios->c_cflag & PARENB) {
> + tx_trans_cfg |= UART_TX_PAR_EN;
> + rx_trans_cfg |= UART_RX_PAR_EN;
> + tx_parity_cfg |= PAR_CALC_EN;
> + rx_parity_cfg |= PAR_CALC_EN;
> + if (termios->c_cflag & PARODD) {
> + tx_parity_cfg |= PAR_ODD;
> + rx_parity_cfg |= PAR_ODD;
> + } else if (termios->c_cflag & CMSPAR) {
> + tx_parity_cfg |= PAR_SPACE;
> + rx_parity_cfg |= PAR_SPACE;
> + } else {
> + tx_parity_cfg |= PAR_EVEN;
> + rx_parity_cfg |= PAR_EVEN;
> + }
> + } else {
> + tx_trans_cfg &= ~UART_TX_PAR_EN;
> + rx_trans_cfg &= ~UART_RX_PAR_EN;
> + tx_parity_cfg &= ~PAR_CALC_EN;
> + rx_parity_cfg &= ~PAR_CALC_EN;
> + }
> +
> + /* bits per char */
> + switch (termios->c_cflag & CSIZE) {
> + case CS5:
> + bits_per_char = 5;
> + break;
> + case CS6:
> + bits_per_char = 6;
> + break;
> + case CS7:
> + bits_per_char = 7;
> + break;
> + case CS8:
> + default:
> + bits_per_char = 8;
> + break;
> + }
> +
> + /* stop bits */
> + if (termios->c_cflag & CSTOPB)
> + stop_bit_len = TX_STOP_BIT_LEN_2;
> + else
> + stop_bit_len = TX_STOP_BIT_LEN_1;
> +
> + /* flow control, clear the CTS_MASK bit if using flow control. */
> + if (termios->c_cflag & CRTSCTS)
> + tx_trans_cfg &= ~UART_CTS_MASK;
> + else
> + tx_trans_cfg |= UART_CTS_MASK;
> +
> + if (likely(baud))
> + uart_update_timeout(uport, termios->c_cflag, baud);
> +
> + geni_serial_write_term_regs(uport, tx_trans_cfg, tx_parity_cfg,
> + rx_trans_cfg, rx_parity_cfg, bits_per_char, stop_bit_len,
> + ser_clk_cfg);
> +exit_set_termios:
> + qcom_geni_serial_start_rx(uport);
> + return;
> +
> +}
> +
> +static unsigned int qcom_geni_serial_tx_empty(struct uart_port *uport)
> +{
> + unsigned int tx_fifo_status;
> + unsigned int is_tx_empty = 1;
> +
> + tx_fifo_status = geni_read_reg_nolog(uport->membase,
> + SE_GENI_TX_FIFO_STATUS);
> + if (tx_fifo_status)
> + is_tx_empty = 0;
> +
> + return is_tx_empty;
> +}
> +
> +#if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL)
> +static int __init qcom_geni_console_setup(struct console *co, char *options)
> +{
> + struct uart_port *uport;
> + struct qcom_geni_serial_port *dev_port;
> + int baud = 115200;
> + int bits = 8;
> + int parity = 'n';
> + int flow = 'n';
> + int ret = 0;
> +
> + if (unlikely(co->index >= GENI_UART_NR_PORTS || co->index < 0))
> + return -ENXIO;
> +
> + dev_port = get_port_from_line(co->index);
> + if (IS_ERR_OR_NULL(dev_port)) {
> + ret = PTR_ERR(dev_port);
> + pr_err("Invalid line %d(%d)\n", co->index, ret);
> + return ret;
> + }
> +
> + uport = &dev_port->uport;
> +
> + if (unlikely(!uport->membase))
> + return -ENXIO;
> +
> + if (geni_se_resources_on(&dev_port->serial_rsc))
> + WARN_ON(1);
> +
> + if (unlikely(geni_se_get_proto(uport->membase) != UART)) {
> + geni_se_resources_off(&dev_port->serial_rsc);
> + return -ENXIO;
> + }
> +
> + if (!dev_port->port_setup) {
> + qcom_geni_serial_stop_rx(uport);
> + qcom_geni_serial_port_setup(uport);
> + }
> +
> + if (options)
> + uart_parse_options(options, &baud, &parity, &bits, &flow);
> +
> + return uart_set_options(uport, co, baud, parity, bits, flow);
> +}
> +
> +static int console_register(struct uart_driver *drv)
> +{
> + return uart_register_driver(drv);
> +}
> +static void console_unregister(struct uart_driver *drv)
> +{
> + uart_unregister_driver(drv);
> +}
> +
> +static struct console cons_ops = {
> + .name = "ttyMSM",
> + .write = qcom_geni_serial_console_write,
> + .device = uart_console_device,
> + .setup = qcom_geni_console_setup,
> + .flags = CON_PRINTBUFFER,
> + .index = -1,
> + .data = &qcom_geni_console_driver,
> +};
> +
> +static struct uart_driver qcom_geni_console_driver = {
> + .owner = THIS_MODULE,
> + .driver_name = "qcom_geni_console",
> + .dev_name = "ttyMSM",
> + .nr = GENI_UART_NR_PORTS,
> + .cons = &cons_ops,
> +};
> +#else
> +static int console_register(struct uart_driver *drv)
> +{
> + return 0;
> +}
> +
> +static void console_unregister(struct uart_driver *drv)
> +{
> +}
> +#endif /* defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) */
> +
> +static void qcom_geni_serial_cons_pm(struct uart_port *uport,
> + unsigned int new_state, unsigned int old_state)
> +{
> + struct qcom_geni_serial_port *qcom_port = GET_DEV_PORT(uport);
> +
> + if (unlikely(!uart_console(uport)))
> + return;
> +
> + if (new_state == UART_PM_STATE_ON && old_state == UART_PM_STATE_OFF)
> + geni_se_resources_on(&qcom_port->serial_rsc);
> + else if (new_state == UART_PM_STATE_OFF &&
> + old_state == UART_PM_STATE_ON)
> + geni_se_resources_off(&qcom_port->serial_rsc);
> +}
> +
> +static const struct uart_ops qcom_geni_console_pops = {
> + .tx_empty = qcom_geni_serial_tx_empty,
> + .stop_tx = qcom_geni_serial_stop_tx,
> + .start_tx = qcom_geni_serial_start_tx,
> + .stop_rx = qcom_geni_serial_stop_rx,
> + .set_termios = qcom_geni_serial_set_termios,
> + .startup = qcom_geni_serial_startup,
> + .config_port = qcom_geni_serial_config_port,
> + .shutdown = qcom_geni_serial_shutdown,
> + .type = qcom_geni_serial_get_type,
> + .set_mctrl = qcom_geni_cons_set_mctrl,
> + .get_mctrl = qcom_geni_cons_get_mctrl,
> +#ifdef CONFIG_CONSOLE_POLL
> + .poll_get_char = qcom_geni_serial_get_char,
> + .poll_put_char = qcom_geni_serial_poll_put_char,
> +#endif
> + .pm = qcom_geni_serial_cons_pm,
> +};
> +
> +static const struct of_device_id qcom_geni_serial_match_table[] = {
> + { .compatible = "qcom,geni-debug-uart",
> + .data = (void *)&qcom_geni_console_driver},
> +};
> +
> +static int qcom_geni_serial_probe(struct platform_device *pdev)
> +{
> + int ret = 0;
> + int line = -1;
> + struct qcom_geni_serial_port *dev_port;
> + struct uart_port *uport;
> + struct resource *res;
> + struct uart_driver *drv;
> + const struct of_device_id *id;
> +
> + id = of_match_device(qcom_geni_serial_match_table, &pdev->dev);
> + if (id) {
> + dev_dbg(&pdev->dev, "%s: %s\n", __func__, id->compatible);
> + drv = (struct uart_driver *)id->data;
> + } else {
> + dev_err(&pdev->dev, "%s: No matching device found", __func__);
> + return -ENODEV;
> + }
> +
> + if (pdev->dev.of_node) {
> + if (drv->cons)
> + line = of_alias_get_id(pdev->dev.of_node, "serial");
> + } else {
> + line = pdev->id;
> + }
> +
> + if (line < 0)
> + line = atomic_inc_return(&uart_line_id) - 1;
> +
> + if ((line < 0) || (line >= GENI_UART_CONS_PORTS))
> + return -ENXIO;
> + dev_port = get_port_from_line(line);
> + if (IS_ERR_OR_NULL(dev_port)) {
> + ret = PTR_ERR(dev_port);
> + dev_err(&pdev->dev, "Invalid line %d(%d)\n",
> + line, ret);
> + goto exit_geni_serial_probe;
> + }
> +
> + uport = &dev_port->uport;
> +
> + /* Don't allow 2 drivers to access the same port */
> + if (uport->private_data) {
> + ret = -ENODEV;
> + goto exit_geni_serial_probe;
> + }
> +
> + uport->dev = &pdev->dev;
> + dev_port->wrapper_dev = pdev->dev.parent;
> + dev_port->serial_rsc.wrapper_dev = pdev->dev.parent;
> + dev_port->serial_rsc.se_clk = devm_clk_get(&pdev->dev, "se-clk");
> + if (IS_ERR(dev_port->serial_rsc.se_clk)) {
> + ret = PTR_ERR(dev_port->serial_rsc.se_clk);
> + dev_err(&pdev->dev, "Err getting SE Core clk %d\n", ret);
> + goto exit_geni_serial_probe;
> + }
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "se-phys");
> + if (!res) {
> + ret = -ENXIO;
> + dev_err(&pdev->dev, "Err getting IO region\n");
> + goto exit_geni_serial_probe;
> + }
> +
> + uport->mapbase = res->start;
> + uport->membase = devm_ioremap(&pdev->dev, res->start,
> + resource_size(res));
> + if (!uport->membase) {
> + ret = -ENOMEM;
> + dev_err(&pdev->dev, "Err IO mapping serial iomem");
> + goto exit_geni_serial_probe;
> + }
> +
> + dev_port->serial_rsc.geni_pinctrl = devm_pinctrl_get(&pdev->dev);
> + if (IS_ERR_OR_NULL(dev_port->serial_rsc.geni_pinctrl)) {
> + dev_err(&pdev->dev, "No pinctrl config specified!\n");
> + ret = PTR_ERR(dev_port->serial_rsc.geni_pinctrl);
> + goto exit_geni_serial_probe;
> + }
> + dev_port->serial_rsc.geni_gpio_active =
> + pinctrl_lookup_state(dev_port->serial_rsc.geni_pinctrl,
> + PINCTRL_DEFAULT);
> + if (IS_ERR_OR_NULL(dev_port->serial_rsc.geni_gpio_active)) {
> + dev_err(&pdev->dev, "No default config specified!\n");
> + ret = PTR_ERR(dev_port->serial_rsc.geni_gpio_active);
> + goto exit_geni_serial_probe;
> + }
> +
> + dev_port->serial_rsc.geni_gpio_sleep =
> + pinctrl_lookup_state(dev_port->serial_rsc.geni_pinctrl,
> + PINCTRL_SLEEP);
> + if (IS_ERR_OR_NULL(dev_port->serial_rsc.geni_gpio_sleep)) {
> + dev_err(&pdev->dev, "No sleep config specified!\n");
> + ret = PTR_ERR(dev_port->serial_rsc.geni_gpio_sleep);
> + goto exit_geni_serial_probe;
> + }
> +
> + dev_port->tx_fifo_depth = DEF_FIFO_DEPTH_WORDS;
> + dev_port->rx_fifo_depth = DEF_FIFO_DEPTH_WORDS;
> + dev_port->tx_fifo_width = DEF_FIFO_WIDTH_BITS;
> + uport->fifosize =
> + ((dev_port->tx_fifo_depth * dev_port->tx_fifo_width) >> 3);
> +
> + uport->irq = platform_get_irq(pdev, 0);
> + if (uport->irq < 0) {
> + ret = uport->irq;
> + dev_err(&pdev->dev, "Failed to get IRQ %d\n", ret);
> + goto exit_geni_serial_probe;
> + }
> +
> + uport->private_data = (void *)drv;
> + platform_set_drvdata(pdev, dev_port);
> + dev_port->handle_rx = handle_rx_console;
> + dev_port->rx_fifo = devm_kzalloc(uport->dev, sizeof(u32),
> + GFP_KERNEL);
> + dev_port->port_setup = false;
> + return uart_add_one_port(drv, uport);
> +
> +exit_geni_serial_probe:
> + return ret;
> +}
> +
> +static int qcom_geni_serial_remove(struct platform_device *pdev)
> +{
> + struct qcom_geni_serial_port *port = platform_get_drvdata(pdev);
> + struct uart_driver *drv =
> + (struct uart_driver *)port->uport.private_data;
> +
> + uart_remove_one_port(drv, &port->uport);
> + return 0;
> +}
> +
> +
> +#ifdef CONFIG_PM
> +static int qcom_geni_serial_sys_suspend_noirq(struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct qcom_geni_serial_port *port = platform_get_drvdata(pdev);
> + struct uart_port *uport = &port->uport;
> +
> + uart_suspend_port((struct uart_driver *)uport->private_data,
> + uport);
> + return 0;
> +}
> +
> +static int qcom_geni_serial_sys_resume_noirq(struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct qcom_geni_serial_port *port = platform_get_drvdata(pdev);
> + struct uart_port *uport = &port->uport;
> +
> + if (console_suspend_enabled && uport->suspended) {
> + uart_resume_port((struct uart_driver *)uport->private_data,
> + uport);
> + disable_irq(uport->irq);
> + }
> + return 0;
> +}
> +#else
> +static int qcom_geni_serial_sys_suspend_noirq(struct device *dev)
> +{
> + return 0;
> +}
> +
> +static int qcom_geni_serial_sys_resume_noirq(struct device *dev)
> +{
> + return 0;
> +}
> +#endif
> +
> +static const struct dev_pm_ops qcom_geni_serial_pm_ops = {
> + .suspend_noirq = qcom_geni_serial_sys_suspend_noirq,
> + .resume_noirq = qcom_geni_serial_sys_resume_noirq,
> +};
> +
> +static struct platform_driver qcom_geni_serial_platform_driver = {
> + .remove = qcom_geni_serial_remove,
> + .probe = qcom_geni_serial_probe,
> + .driver = {
> + .name = "qcom_geni_serial",
> + .of_match_table = qcom_geni_serial_match_table,
> + .pm = &qcom_geni_serial_pm_ops,
> + },
> +};
> +
> +static int __init qcom_geni_serial_init(void)
> +{
> + int ret = 0;
> + int i;
> +
> + for (i = 0; i < GENI_UART_CONS_PORTS; i++) {
> + qcom_geni_console_port.uport.iotype = UPIO_MEM;
> + qcom_geni_console_port.uport.ops = &qcom_geni_console_pops;
> + qcom_geni_console_port.uport.flags = UPF_BOOT_AUTOCONF;
> + qcom_geni_console_port.uport.line = i;
> + }
> +
> + ret = console_register(&qcom_geni_console_driver);
> + if (ret)
> + return ret;
> +
> + ret = platform_driver_register(&qcom_geni_serial_platform_driver);
> + if (ret) {
> + console_unregister(&qcom_geni_console_driver);
> + return ret;
> + }
> + return ret;
> +}
> +module_init(qcom_geni_serial_init);
> +
> +static void __exit qcom_geni_serial_exit(void)
> +{
> + platform_driver_unregister(&qcom_geni_serial_platform_driver);
> + console_unregister(&qcom_geni_console_driver);
> +}
> +module_exit(qcom_geni_serial_exit);
> +
> +MODULE_DESCRIPTION("Serial driver for GENI based QUP cores");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("tty:qcom_geni_serial");
--
To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
