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 | 1447 +++++++++++++++++++++++++++++++++
3 files changed, 1458 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
+ 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..8703fa6
--- /dev/null
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -0,0 +1,1447 @@
+/*
+ * Copyright (c) 2017, 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)
+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_device_tbl[] = {
+ { .compatible = "qcom,geni-console",
+ .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;
+ struct platform_device *wrapper_pdev;
+ struct device_node *wrapper_ph_node;
+
+ id = of_match_device(qcom_geni_device_tbl, &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;
+ wrapper_ph_node = of_parse_phandle(pdev->dev.of_node,
+ "qcom,wrapper-core", 0);
+ if (IS_ERR_OR_NULL(wrapper_ph_node)) {
+ ret = PTR_ERR(wrapper_ph_node);
+ goto exit_geni_serial_probe;
+ }
+ wrapper_pdev = of_find_device_by_node(wrapper_ph_node);
+ of_node_put(wrapper_ph_node);
+ if (IS_ERR_OR_NULL(wrapper_pdev)) {
+ ret = PTR_ERR(wrapper_pdev);
+ goto exit_geni_serial_probe;
+ }
+ dev_port->wrapper_dev = &wrapper_pdev->dev;
+ dev_port->serial_rsc.wrapper_dev = &wrapper_pdev->dev;
+ 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;
+ }
+
+ dev_port->serial_rsc.m_ahb_clk = devm_clk_get(&pdev->dev, "m-ahb");
+ if (IS_ERR(dev_port->serial_rsc.m_ahb_clk)) {
+ ret = PTR_ERR(dev_port->serial_rsc.m_ahb_clk);
+ dev_err(&pdev->dev, "Err getting M AHB clk %d\n", ret);
+ goto exit_geni_serial_probe;
+ }
+
+ dev_port->serial_rsc.s_ahb_clk = devm_clk_get(&pdev->dev, "s-ahb");
+ if (IS_ERR(dev_port->serial_rsc.s_ahb_clk)) {
+ ret = PTR_ERR(dev_port->serial_rsc.s_ahb_clk);
+ dev_err(&pdev->dev, "Err getting S AHB 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 const struct of_device_id qcom_geni_serial_match_table[] = {
+ { .compatible = "qcom,geni-uart"},
+ {},
+};
+
+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");
--
Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
