--- /dev/null
- msm_write(port, port->x_char, UART_TF);
+/*
+ * drivers/serial/msm_serial.c - driver for msm7k serial device and console
+ *
+ * Copyright (C) 2007 Google, Inc.
+ * Author: Robert Love <rlove@google.com>
++ * Copyright (c) 2011, Code Aurora Forum. 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.
+ */
+
+#if defined(CONFIG_SERIAL_MSM_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+# define SUPPORT_SYSRQ
+#endif
+
+#include <linux/hrtimer.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/irq.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/clk.h>
+#include <linux/platform_device.h>
++#include <linux/delay.h>
+
+#include "msm_serial.h"
+
+struct msm_port {
+ struct uart_port uart;
+ char name[16];
+ struct clk *clk;
++ struct clk *pclk;
+ unsigned int imr;
++ unsigned int *gsbi_base;
++ int is_uartdm;
++ unsigned int old_snap_state;
+};
+
++static inline void wait_for_xmitr(struct uart_port *port, int bits)
++{
++ if (!(msm_read(port, UART_SR) & UART_SR_TX_EMPTY))
++ while ((msm_read(port, UART_ISR) & bits) != bits)
++ cpu_relax();
++}
++
+static void msm_stop_tx(struct uart_port *port)
+{
+ struct msm_port *msm_port = UART_TO_MSM(port);
+
+ msm_port->imr &= ~UART_IMR_TXLEV;
+ msm_write(port, msm_port->imr, UART_IMR);
+}
+
+static void msm_start_tx(struct uart_port *port)
+{
+ struct msm_port *msm_port = UART_TO_MSM(port);
+
+ msm_port->imr |= UART_IMR_TXLEV;
+ msm_write(port, msm_port->imr, UART_IMR);
+}
+
+static void msm_stop_rx(struct uart_port *port)
+{
+ struct msm_port *msm_port = UART_TO_MSM(port);
+
+ msm_port->imr &= ~(UART_IMR_RXLEV | UART_IMR_RXSTALE);
+ msm_write(port, msm_port->imr, UART_IMR);
+}
+
+static void msm_enable_ms(struct uart_port *port)
+{
+ struct msm_port *msm_port = UART_TO_MSM(port);
+
+ msm_port->imr |= UART_IMR_DELTA_CTS;
+ msm_write(port, msm_port->imr, UART_IMR);
+}
+
++static void handle_rx_dm(struct uart_port *port, unsigned int misr)
++{
++ struct tty_struct *tty = port->state->port.tty;
++ unsigned int sr;
++ int count = 0;
++ struct msm_port *msm_port = UART_TO_MSM(port);
++
++ if ((msm_read(port, UART_SR) & UART_SR_OVERRUN)) {
++ port->icount.overrun++;
++ tty_insert_flip_char(tty, 0, TTY_OVERRUN);
++ msm_write(port, UART_CR_CMD_RESET_ERR, UART_CR);
++ }
++
++ if (misr & UART_IMR_RXSTALE) {
++ count = msm_read(port, UARTDM_RX_TOTAL_SNAP) -
++ msm_port->old_snap_state;
++ msm_port->old_snap_state = 0;
++ } else {
++ count = 4 * (msm_read(port, UART_RFWR));
++ msm_port->old_snap_state += count;
++ }
++
++ /* TODO: Precise error reporting */
++
++ port->icount.rx += count;
++
++ while (count > 0) {
++ unsigned int c;
++
++ sr = msm_read(port, UART_SR);
++ if ((sr & UART_SR_RX_READY) == 0) {
++ msm_port->old_snap_state -= count;
++ break;
++ }
++ c = msm_read(port, UARTDM_RF);
++ if (sr & UART_SR_RX_BREAK) {
++ port->icount.brk++;
++ if (uart_handle_break(port))
++ continue;
++ } else if (sr & UART_SR_PAR_FRAME_ERR)
++ port->icount.frame++;
++
++ /* TODO: handle sysrq */
++ tty_insert_flip_string(tty, (char *) &c,
++ (count > 4) ? 4 : count);
++ count -= 4;
++ }
++
++ tty_flip_buffer_push(tty);
++ if (misr & (UART_IMR_RXSTALE))
++ msm_write(port, UART_CR_CMD_RESET_STALE_INT, UART_CR);
++ msm_write(port, 0xFFFFFF, UARTDM_DMRX);
++ msm_write(port, UART_CR_CMD_STALE_EVENT_ENABLE, UART_CR);
++}
++
+static void handle_rx(struct uart_port *port)
+{
+ struct tty_struct *tty = port->state->port.tty;
+ unsigned int sr;
+
+ /*
+ * 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.
+ */
+ if ((msm_read(port, UART_SR) & UART_SR_OVERRUN)) {
+ port->icount.overrun++;
+ tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+ msm_write(port, UART_CR_CMD_RESET_ERR, UART_CR);
+ }
+
+ /* and now the main RX loop */
+ while ((sr = msm_read(port, UART_SR)) & UART_SR_RX_READY) {
+ unsigned int c;
+ char flag = TTY_NORMAL;
+
+ c = msm_read(port, UART_RF);
+
+ if (sr & UART_SR_RX_BREAK) {
+ port->icount.brk++;
+ if (uart_handle_break(port))
+ continue;
+ } else if (sr & UART_SR_PAR_FRAME_ERR) {
+ port->icount.frame++;
+ } else {
+ port->icount.rx++;
+ }
+
+ /* Mask conditions we're ignorning. */
+ sr &= port->read_status_mask;
+
+ if (sr & UART_SR_RX_BREAK) {
+ flag = TTY_BREAK;
+ } else if (sr & UART_SR_PAR_FRAME_ERR) {
+ flag = TTY_FRAME;
+ }
+
+ if (!uart_handle_sysrq_char(port, c))
+ tty_insert_flip_char(tty, c, flag);
+ }
+
+ tty_flip_buffer_push(tty);
+}
+
++static void reset_dm_count(struct uart_port *port)
++{
++ wait_for_xmitr(port, UART_ISR_TX_READY);
++ msm_write(port, 1, UARTDM_NCF_TX);
++}
++
+static void handle_tx(struct uart_port *port)
+{
+ struct circ_buf *xmit = &port->state->xmit;
+ struct msm_port *msm_port = UART_TO_MSM(port);
+ int sent_tx;
+
+ if (port->x_char) {
- msm_write(port, xmit->buf[xmit->tail], UART_TF);
++ if (msm_port->is_uartdm)
++ reset_dm_count(port);
++
++ msm_write(port, port->x_char,
++ msm_port->is_uartdm ? UARTDM_TF : UART_TF);
+ port->icount.tx++;
+ port->x_char = 0;
+ }
+
++ if (msm_port->is_uartdm)
++ reset_dm_count(port);
++
+ while (msm_read(port, UART_SR) & UART_SR_TX_READY) {
+ if (uart_circ_empty(xmit)) {
+ /* disable tx interrupts */
+ msm_port->imr &= ~UART_IMR_TXLEV;
+ msm_write(port, msm_port->imr, UART_IMR);
+ break;
+ }
++ msm_write(port, xmit->buf[xmit->tail],
++ msm_port->is_uartdm ? UARTDM_TF : UART_TF);
+
- if (misr & (UART_IMR_RXLEV | UART_IMR_RXSTALE))
- handle_rx(port);
++ if (msm_port->is_uartdm)
++ reset_dm_count(port);
+
+ xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+ port->icount.tx++;
+ sent_tx = 1;
+ }
+
+ if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ uart_write_wakeup(port);
+}
+
+static void handle_delta_cts(struct uart_port *port)
+{
+ msm_write(port, UART_CR_CMD_RESET_CTS, UART_CR);
+ port->icount.cts++;
+ wake_up_interruptible(&port->state->port.delta_msr_wait);
+}
+
+static irqreturn_t msm_irq(int irq, void *dev_id)
+{
+ struct uart_port *port = dev_id;
+ struct msm_port *msm_port = UART_TO_MSM(port);
+ unsigned int misr;
+
+ spin_lock(&port->lock);
+ misr = msm_read(port, UART_MISR);
+ msm_write(port, 0, UART_IMR); /* disable interrupt */
+
- static void msm_set_mctrl(struct uart_port *port, unsigned int mctrl)
++ if (misr & (UART_IMR_RXLEV | UART_IMR_RXSTALE)) {
++ if (msm_port->is_uartdm)
++ handle_rx_dm(port, misr);
++ else
++ handle_rx(port);
++ }
+ if (misr & UART_IMR_TXLEV)
+ handle_tx(port);
+ if (misr & UART_IMR_DELTA_CTS)
+ handle_delta_cts(port);
+
+ msm_write(port, msm_port->imr, UART_IMR); /* restore interrupt */
+ spin_unlock(&port->lock);
+
+ return IRQ_HANDLED;
+}
+
+static unsigned int msm_tx_empty(struct uart_port *port)
+{
+ return (msm_read(port, UART_SR) & UART_SR_TX_EMPTY) ? TIOCSER_TEMT : 0;
+}
+
+static unsigned int msm_get_mctrl(struct uart_port *port)
+{
+ return TIOCM_CAR | TIOCM_CTS | TIOCM_DSR | TIOCM_RTS;
+}
+
- unsigned int mr;
++
++static void msm_reset(struct uart_port *port)
+{
- static void msm_reset(struct uart_port *port)
- {
- /* reset everything */
- msm_write(port, UART_CR_CMD_RESET_RX, UART_CR);
- msm_write(port, UART_CR_CMD_RESET_TX, UART_CR);
- msm_write(port, UART_CR_CMD_RESET_ERR, UART_CR);
- msm_write(port, UART_CR_CMD_RESET_BREAK_INT, UART_CR);
- msm_write(port, UART_CR_CMD_RESET_CTS, UART_CR);
- msm_write(port, UART_CR_CMD_SET_RFR, UART_CR);
- }
++ /* reset everything */
++ msm_write(port, UART_CR_CMD_RESET_RX, UART_CR);
++ msm_write(port, UART_CR_CMD_RESET_TX, UART_CR);
++ msm_write(port, UART_CR_CMD_RESET_ERR, UART_CR);
++ msm_write(port, UART_CR_CMD_RESET_BREAK_INT, UART_CR);
++ msm_write(port, UART_CR_CMD_RESET_CTS, UART_CR);
++ msm_write(port, UART_CR_CMD_SET_RFR, UART_CR);
++}
+
++void msm_set_mctrl(struct uart_port *port, unsigned int mctrl)
++{
++ unsigned int mr;
+ mr = msm_read(port, UART_MR1);
+
+ if (!(mctrl & TIOCM_RTS)) {
+ mr &= ~UART_MR1_RX_RDY_CTL;
+ msm_write(port, mr, UART_MR1);
+ msm_write(port, UART_CR_CMD_RESET_RFR, UART_CR);
+ } else {
+ mr |= UART_MR1_RX_RDY_CTL;
+ msm_write(port, mr, UART_MR1);
+ }
+}
+
+static void msm_break_ctl(struct uart_port *port, int break_ctl)
+{
+ if (break_ctl)
+ msm_write(port, UART_CR_CMD_START_BREAK, UART_CR);
+ else
+ msm_write(port, UART_CR_CMD_STOP_BREAK, UART_CR);
+}
+
+static int msm_set_baud_rate(struct uart_port *port, unsigned int baud)
+{
+ unsigned int baud_code, rxstale, watermark;
++ struct msm_port *msm_port = UART_TO_MSM(port);
+
+ switch (baud) {
+ case 300:
+ baud_code = UART_CSR_300;
+ rxstale = 1;
+ break;
+ case 600:
+ baud_code = UART_CSR_600;
+ rxstale = 1;
+ break;
+ case 1200:
+ baud_code = UART_CSR_1200;
+ rxstale = 1;
+ break;
+ case 2400:
+ baud_code = UART_CSR_2400;
+ rxstale = 1;
+ break;
+ case 4800:
+ baud_code = UART_CSR_4800;
+ rxstale = 1;
+ break;
+ case 9600:
+ baud_code = UART_CSR_9600;
+ rxstale = 2;
+ break;
+ case 14400:
+ baud_code = UART_CSR_14400;
+ rxstale = 3;
+ break;
+ case 19200:
+ baud_code = UART_CSR_19200;
+ rxstale = 4;
+ break;
+ case 28800:
+ baud_code = UART_CSR_28800;
+ rxstale = 6;
+ break;
+ case 38400:
+ baud_code = UART_CSR_38400;
+ rxstale = 8;
+ break;
+ case 57600:
+ baud_code = UART_CSR_57600;
+ rxstale = 16;
+ break;
+ case 115200:
+ default:
+ baud_code = UART_CSR_115200;
+ baud = 115200;
+ rxstale = 31;
+ break;
+ }
+
++ if (msm_port->is_uartdm)
++ msm_write(port, UART_CR_CMD_RESET_RX, UART_CR);
++
+ msm_write(port, baud_code, UART_CSR);
+
+ /* RX stale watermark */
+ watermark = UART_IPR_STALE_LSB & rxstale;
+ watermark |= UART_IPR_RXSTALE_LAST;
+ watermark |= UART_IPR_STALE_TIMEOUT_MSB & (rxstale << 2);
+ msm_write(port, watermark, UART_IPR);
+
+ /* set RX watermark */
+ watermark = (port->fifosize * 3) / 4;
+ msm_write(port, watermark, UART_RFWR);
+
+ /* set TX watermark */
+ msm_write(port, 10, UART_TFWR);
+
++ if (msm_port->is_uartdm) {
++ msm_write(port, UART_CR_CMD_RESET_STALE_INT, UART_CR);
++ msm_write(port, 0xFFFFFF, UARTDM_DMRX);
++ msm_write(port, UART_CR_CMD_STALE_EVENT_ENABLE, UART_CR);
++ }
++
+ return baud;
+}
+
- msm_reset(port);
+
+static void msm_init_clock(struct uart_port *port)
+{
+ struct msm_port *msm_port = UART_TO_MSM(port);
+
+ clk_enable(msm_port->clk);
++ if (!IS_ERR(msm_port->pclk))
++ clk_enable(msm_port->pclk);
+ msm_serial_set_mnd_regs(port);
+}
+
+static int msm_startup(struct uart_port *port)
+{
+ struct msm_port *msm_port = UART_TO_MSM(port);
+ unsigned int data, rfr_level;
+ int ret;
+
+ snprintf(msm_port->name, sizeof(msm_port->name),
+ "msm_serial%d", port->line);
+
+ ret = request_irq(port->irq, msm_irq, IRQF_TRIGGER_HIGH,
+ msm_port->name, port);
+ if (unlikely(ret))
+ return ret;
+
+ msm_init_clock(port);
+
+ if (likely(port->fifosize > 12))
+ rfr_level = port->fifosize - 12;
+ else
+ rfr_level = port->fifosize;
+
+ /* set automatic RFR level */
+ data = msm_read(port, UART_MR1);
+ data &= ~UART_MR1_AUTO_RFR_LEVEL1;
+ data &= ~UART_MR1_AUTO_RFR_LEVEL0;
+ data |= UART_MR1_AUTO_RFR_LEVEL1 & (rfr_level << 2);
+ data |= UART_MR1_AUTO_RFR_LEVEL0 & rfr_level;
+ msm_write(port, data, UART_MR1);
+
+ /* make sure that RXSTALE count is non-zero */
+ data = msm_read(port, UART_IPR);
+ if (unlikely(!data)) {
+ data |= UART_IPR_RXSTALE_LAST;
+ data |= UART_IPR_STALE_LSB;
+ msm_write(port, data, UART_IPR);
+ }
+
- msm_write(port, 0x05, UART_CR); /* enable TX & RX */
++ data = 0;
++ if (!port->cons || (port->cons && !(port->cons->flags & CON_ENABLED))) {
++ msm_write(port, UART_CR_CMD_PROTECTION_EN, UART_CR);
++ msm_reset(port);
++ data = UART_CR_TX_ENABLE;
++ }
++
++ data |= UART_CR_RX_ENABLE;
++ msm_write(port, data, UART_CR); /* enable TX & RX */
+
- msm_write(port, msm_port->imr, UART_IMR);
++ /* Make sure IPR is not 0 to start with*/
++ if (msm_port->is_uartdm)
++ msm_write(port, UART_IPR_STALE_LSB, UART_IPR);
+
+ /* turn on RX and CTS interrupts */
+ msm_port->imr = UART_IMR_RXLEV | UART_IMR_RXSTALE |
+ UART_IMR_CURRENT_CTS;
-
+
++ if (msm_port->is_uartdm) {
++ msm_write(port, 0xFFFFFF, UARTDM_DMRX);
++ msm_write(port, UART_CR_CMD_RESET_STALE_INT, UART_CR);
++ msm_write(port, UART_CR_CMD_STALE_EVENT_ENABLE, UART_CR);
++ }
++
++ msm_write(port, msm_port->imr, UART_IMR);
+ return 0;
+}
+
+static void msm_shutdown(struct uart_port *port)
+{
+ struct msm_port *msm_port = UART_TO_MSM(port);
+
+ msm_port->imr = 0;
+ msm_write(port, 0, UART_IMR); /* disable interrupts */
+
+ clk_disable(msm_port->clk);
+
+ free_irq(port->irq, port);
+}
+
+static void msm_set_termios(struct uart_port *port, struct ktermios *termios,
+ struct ktermios *old)
+{
+ unsigned long flags;
+ unsigned int baud, mr;
+
+ spin_lock_irqsave(&port->lock, flags);
+
+ /* calculate and set baud rate */
+ baud = uart_get_baud_rate(port, termios, old, 300, 115200);
+ baud = msm_set_baud_rate(port, baud);
+ if (tty_termios_baud_rate(termios))
+ tty_termios_encode_baud_rate(termios, baud, baud);
- struct resource *resource;
++
+ /* calculate parity */
+ mr = msm_read(port, UART_MR2);
+ mr &= ~UART_MR2_PARITY_MODE;
+ if (termios->c_cflag & PARENB) {
+ if (termios->c_cflag & PARODD)
+ mr |= UART_MR2_PARITY_MODE_ODD;
+ else if (termios->c_cflag & CMSPAR)
+ mr |= UART_MR2_PARITY_MODE_SPACE;
+ else
+ mr |= UART_MR2_PARITY_MODE_EVEN;
+ }
+
+ /* calculate bits per char */
+ mr &= ~UART_MR2_BITS_PER_CHAR;
+ switch (termios->c_cflag & CSIZE) {
+ case CS5:
+ mr |= UART_MR2_BITS_PER_CHAR_5;
+ break;
+ case CS6:
+ mr |= UART_MR2_BITS_PER_CHAR_6;
+ break;
+ case CS7:
+ mr |= UART_MR2_BITS_PER_CHAR_7;
+ break;
+ case CS8:
+ default:
+ mr |= UART_MR2_BITS_PER_CHAR_8;
+ break;
+ }
+
+ /* calculate stop bits */
+ mr &= ~(UART_MR2_STOP_BIT_LEN_ONE | UART_MR2_STOP_BIT_LEN_TWO);
+ if (termios->c_cflag & CSTOPB)
+ mr |= UART_MR2_STOP_BIT_LEN_TWO;
+ else
+ mr |= UART_MR2_STOP_BIT_LEN_ONE;
+
+ /* set parity, bits per char, and stop bit */
+ msm_write(port, mr, UART_MR2);
+
+ /* calculate and set hardware flow control */
+ mr = msm_read(port, UART_MR1);
+ mr &= ~(UART_MR1_CTS_CTL | UART_MR1_RX_RDY_CTL);
+ if (termios->c_cflag & CRTSCTS) {
+ mr |= UART_MR1_CTS_CTL;
+ mr |= UART_MR1_RX_RDY_CTL;
+ }
+ msm_write(port, mr, UART_MR1);
+
+ /* Configure status bits to ignore based on termio flags. */
+ port->read_status_mask = 0;
+ if (termios->c_iflag & INPCK)
+ port->read_status_mask |= UART_SR_PAR_FRAME_ERR;
+ if (termios->c_iflag & (BRKINT | PARMRK))
+ port->read_status_mask |= UART_SR_RX_BREAK;
+
+ uart_update_timeout(port, termios->c_cflag, baud);
+
+ spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static const char *msm_type(struct uart_port *port)
+{
+ return "MSM";
+}
+
+static void msm_release_port(struct uart_port *port)
+{
+ struct platform_device *pdev = to_platform_device(port->dev);
- resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (unlikely(!resource))
++ struct msm_port *msm_port = UART_TO_MSM(port);
++ struct resource *uart_resource;
++ struct resource *gsbi_resource;
+ resource_size_t size;
+
- size = resource->end - resource->start + 1;
++ uart_resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++ if (unlikely(!uart_resource))
+ return;
- struct resource *resource;
++ size = resource_size(uart_resource);
+
+ release_mem_region(port->mapbase, size);
+ iounmap(port->membase);
+ port->membase = NULL;
++
++ if (msm_port->gsbi_base) {
++ iowrite32(GSBI_PROTOCOL_IDLE, msm_port->gsbi_base +
++ GSBI_CONTROL);
++
++ gsbi_resource = platform_get_resource_byname(pdev,
++ IORESOURCE_MEM,
++ "gsbi_resource");
++
++ if (unlikely(!gsbi_resource))
++ return;
++
++ size = resource_size(gsbi_resource);
++ release_mem_region(gsbi_resource->start, size);
++ iounmap(msm_port->gsbi_base);
++ msm_port->gsbi_base = NULL;
++ }
+}
+
+static int msm_request_port(struct uart_port *port)
+{
++ struct msm_port *msm_port = UART_TO_MSM(port);
+ struct platform_device *pdev = to_platform_device(port->dev);
- resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (unlikely(!resource))
++ struct resource *uart_resource;
++ struct resource *gsbi_resource;
+ resource_size_t size;
++ int ret;
+
- size = resource->end - resource->start + 1;
++ uart_resource = platform_get_resource_byname(pdev, IORESOURCE_MEM,
++ "uart_resource");
++ if (unlikely(!uart_resource))
+ return -ENXIO;
- if (unlikely(!request_mem_region(port->mapbase, size, "msm_serial")))
+
- release_mem_region(port->mapbase, size);
- return -EBUSY;
++ size = resource_size(uart_resource);
++
++ if (!request_mem_region(port->mapbase, size, "msm_serial"))
+ return -EBUSY;
+
+ port->membase = ioremap(port->mapbase, size);
+ if (!port->membase) {
- msm_request_port(port);
++ ret = -EBUSY;
++ goto fail_release_port;
++ }
++
++ gsbi_resource = platform_get_resource_byname(pdev, IORESOURCE_MEM,
++ "gsbi_resource");
++ /* Is this a GSBI-based port? */
++ if (gsbi_resource) {
++ size = resource_size(gsbi_resource);
++
++ if (!request_mem_region(gsbi_resource->start, size,
++ "msm_serial")) {
++ ret = -EBUSY;
++ goto fail_release_port;
++ }
++
++ msm_port->gsbi_base = ioremap(gsbi_resource->start, size);
++ if (!msm_port->gsbi_base) {
++ ret = -EBUSY;
++ goto fail_release_gsbi;
++ }
+ }
+
+ return 0;
++
++fail_release_gsbi:
++ release_mem_region(gsbi_resource->start, size);
++fail_release_port:
++ release_mem_region(port->mapbase, size);
++ return ret;
+}
+
+static void msm_config_port(struct uart_port *port, int flags)
+{
++ struct msm_port *msm_port = UART_TO_MSM(port);
++ int ret;
+ if (flags & UART_CONFIG_TYPE) {
+ port->type = PORT_MSM;
- .fifosize = 512,
++ ret = msm_request_port(port);
++ if (ret)
++ return;
+ }
++
++ if (msm_port->is_uartdm)
++ iowrite32(GSBI_PROTOCOL_UART, msm_port->gsbi_base +
++ GSBI_CONTROL);
+}
+
+static int msm_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+ if (unlikely(ser->type != PORT_UNKNOWN && ser->type != PORT_MSM))
+ return -EINVAL;
+ if (unlikely(port->irq != ser->irq))
+ return -EINVAL;
+ return 0;
+}
+
+static void msm_power(struct uart_port *port, unsigned int state,
+ unsigned int oldstate)
+{
+ struct msm_port *msm_port = UART_TO_MSM(port);
+
+ switch (state) {
+ case 0:
+ clk_enable(msm_port->clk);
++ if (!IS_ERR(msm_port->pclk))
++ clk_enable(msm_port->pclk);
+ break;
+ case 3:
+ clk_disable(msm_port->clk);
++ if (!IS_ERR(msm_port->pclk))
++ clk_disable(msm_port->pclk);
+ break;
+ default:
+ printk(KERN_ERR "msm_serial: Unknown PM state %d\n", state);
+ }
+}
+
+static struct uart_ops msm_uart_pops = {
+ .tx_empty = msm_tx_empty,
+ .set_mctrl = msm_set_mctrl,
+ .get_mctrl = msm_get_mctrl,
+ .stop_tx = msm_stop_tx,
+ .start_tx = msm_start_tx,
+ .stop_rx = msm_stop_rx,
+ .enable_ms = msm_enable_ms,
+ .break_ctl = msm_break_ctl,
+ .startup = msm_startup,
+ .shutdown = msm_shutdown,
+ .set_termios = msm_set_termios,
+ .type = msm_type,
+ .release_port = msm_release_port,
+ .request_port = msm_request_port,
+ .config_port = msm_config_port,
+ .verify_port = msm_verify_port,
+ .pm = msm_power,
+};
+
+static struct msm_port msm_uart_ports[] = {
+ {
+ .uart = {
+ .iotype = UPIO_MEM,
+ .ops = &msm_uart_pops,
+ .flags = UPF_BOOT_AUTOCONF,
- .fifosize = 512,
++ .fifosize = 64,
+ .line = 0,
+ },
+ },
+ {
+ .uart = {
+ .iotype = UPIO_MEM,
+ .ops = &msm_uart_pops,
+ .flags = UPF_BOOT_AUTOCONF,
- msm_write(port, c, UART_TF);
++ .fifosize = 64,
+ .line = 1,
+ },
+ },
+ {
+ .uart = {
+ .iotype = UPIO_MEM,
+ .ops = &msm_uart_pops,
+ .flags = UPF_BOOT_AUTOCONF,
+ .fifosize = 64,
+ .line = 2,
+ },
+ },
+};
+
+#define UART_NR ARRAY_SIZE(msm_uart_ports)
+
+static inline struct uart_port *get_port_from_line(unsigned int line)
+{
+ return &msm_uart_ports[line].uart;
+}
+
+#ifdef CONFIG_SERIAL_MSM_CONSOLE
+
+static void msm_console_putchar(struct uart_port *port, int c)
+{
++ struct msm_port *msm_port = UART_TO_MSM(port);
++
++ if (msm_port->is_uartdm)
++ reset_dm_count(port);
++
+ while (!(msm_read(port, UART_SR) & UART_SR_TX_READY))
+ ;
- msm_port->clk = clk_get(&pdev->dev, "uart_clk");
- if (IS_ERR(msm_port->clk))
- return PTR_ERR(msm_port->clk);
++ msm_write(port, c, msm_port->is_uartdm ? UARTDM_TF : UART_TF);
+}
+
+static void msm_console_write(struct console *co, const char *s,
+ unsigned int count)
+{
+ struct uart_port *port;
+ struct msm_port *msm_port;
+
+ BUG_ON(co->index < 0 || co->index >= UART_NR);
+
+ port = get_port_from_line(co->index);
+ msm_port = UART_TO_MSM(port);
+
+ spin_lock(&port->lock);
+ uart_console_write(port, s, count, msm_console_putchar);
+ spin_unlock(&port->lock);
+}
+
+static int __init msm_console_setup(struct console *co, char *options)
+{
+ struct uart_port *port;
++ struct msm_port *msm_port;
+ int baud, flow, bits, parity;
+
+ if (unlikely(co->index >= UART_NR || co->index < 0))
+ return -ENXIO;
+
+ port = get_port_from_line(co->index);
++ msm_port = UART_TO_MSM(port);
+
+ if (unlikely(!port->membase))
+ return -ENXIO;
+
+ port->cons = co;
+
+ msm_init_clock(port);
+
+ if (options)
+ uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+ bits = 8;
+ parity = 'n';
+ flow = 'n';
+ msm_write(port, UART_MR2_BITS_PER_CHAR_8 | UART_MR2_STOP_BIT_LEN_ONE,
+ UART_MR2); /* 8N1 */
+
+ if (baud < 300 || baud > 115200)
+ baud = 115200;
+ msm_set_baud_rate(port, baud);
+
+ msm_reset(port);
+
++ if (msm_port->is_uartdm) {
++ msm_write(port, UART_CR_CMD_PROTECTION_EN, UART_CR);
++ msm_write(port, UART_CR_TX_ENABLE, UART_CR);
++ }
++
+ printk(KERN_INFO "msm_serial: console setup on port #%d\n", port->line);
+
+ return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver msm_uart_driver;
+
+static struct console msm_console = {
+ .name = "ttyMSM",
+ .write = msm_console_write,
+ .device = uart_console_device,
+ .setup = msm_console_setup,
+ .flags = CON_PRINTBUFFER,
+ .index = -1,
+ .data = &msm_uart_driver,
+};
+
+#define MSM_CONSOLE (&msm_console)
+
+#else
+#define MSM_CONSOLE NULL
+#endif
+
+static struct uart_driver msm_uart_driver = {
+ .owner = THIS_MODULE,
+ .driver_name = "msm_serial",
+ .dev_name = "ttyMSM",
+ .nr = UART_NR,
+ .cons = MSM_CONSOLE,
+};
+
+static int __init msm_serial_probe(struct platform_device *pdev)
+{
+ struct msm_port *msm_port;
+ struct resource *resource;
+ struct uart_port *port;
+ int irq;
+
+ if (unlikely(pdev->id < 0 || pdev->id >= UART_NR))
+ return -ENXIO;
+
+ printk(KERN_INFO "msm_serial: detected port #%d\n", pdev->id);
+
+ port = get_port_from_line(pdev->id);
+ port->dev = &pdev->dev;
+ msm_port = UART_TO_MSM(port);
+
- resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++ if (platform_get_resource_byname(pdev, IORESOURCE_MEM, "gsbi_resource"))
++ msm_port->is_uartdm = 1;
++ else
++ msm_port->is_uartdm = 0;
++
++ if (msm_port->is_uartdm) {
++ msm_port->clk = clk_get(&pdev->dev, "gsbi_uart_clk");
++ msm_port->pclk = clk_get(&pdev->dev, "gsbi_pclk");
++ } else {
++ msm_port->clk = clk_get(&pdev->dev, "uart_clk");
++ msm_port->pclk = ERR_PTR(-ENOENT);
++ }
++
++ if (unlikely(IS_ERR(msm_port->clk) || (IS_ERR(msm_port->pclk) &&
++ msm_port->is_uartdm)))
++ return PTR_ERR(msm_port->clk);
++
++ if (msm_port->is_uartdm)
++ clk_set_rate(msm_port->clk, 7372800);
++
+ port->uartclk = clk_get_rate(msm_port->clk);
+ printk(KERN_INFO "uartclk = %d\n", port->uartclk);
+
+
++ resource = platform_get_resource_byname(pdev, IORESOURCE_MEM,
++ "uart_resource");
+ if (unlikely(!resource))
+ return -ENXIO;
+ port->mapbase = resource->start;
+
+ irq = platform_get_irq(pdev, 0);
+ if (unlikely(irq < 0))
+ return -ENXIO;
+ port->irq = irq;
+
+ platform_set_drvdata(pdev, port);
+
+ return uart_add_one_port(&msm_uart_driver, port);
+}
+
+static int __devexit msm_serial_remove(struct platform_device *pdev)
+{
+ struct msm_port *msm_port = platform_get_drvdata(pdev);
+
+ clk_put(msm_port->clk);
+
+ return 0;
+}
+
+static struct platform_driver msm_platform_driver = {
+ .remove = msm_serial_remove,
+ .driver = {
+ .name = "msm_serial",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init msm_serial_init(void)
+{
+ int ret;
+
+ ret = uart_register_driver(&msm_uart_driver);
+ if (unlikely(ret))
+ return ret;
+
+ ret = platform_driver_probe(&msm_platform_driver, msm_serial_probe);
+ if (unlikely(ret))
+ uart_unregister_driver(&msm_uart_driver);
+
+ printk(KERN_INFO "msm_serial: driver initialized\n");
+
+ return ret;
+}
+
+static void __exit msm_serial_exit(void)
+{
+#ifdef CONFIG_SERIAL_MSM_CONSOLE
+ unregister_console(&msm_console);
+#endif
+ platform_driver_unregister(&msm_platform_driver);
+ uart_unregister_driver(&msm_uart_driver);
+}
+
+module_init(msm_serial_init);
+module_exit(msm_serial_exit);
+
+MODULE_AUTHOR("Robert Love <rlove@google.com>");
+MODULE_DESCRIPTION("Driver for msm7x serial device");
+MODULE_LICENSE("GPL");
--- /dev/null
- #define UART_CR_TX_ENABLE (1 << 3)
- #define UART_CR_RX_DISABLE (1 << 3)
- #define UART_CR_RX_ENABLE (1 << 3)
+/*
+ * drivers/serial/msm_serial.h
+ *
+ * Copyright (C) 2007 Google, Inc.
+ * Author: Robert Love <rlove@google.com>
++ * Copyright (c) 2011, Code Aurora Forum. 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.
+ */
+
+#ifndef __DRIVERS_SERIAL_MSM_SERIAL_H
+#define __DRIVERS_SERIAL_MSM_SERIAL_H
+
+#define UART_MR1 0x0000
+
+#define UART_MR1_AUTO_RFR_LEVEL0 0x3F
+#define UART_MR1_AUTO_RFR_LEVEL1 0x3FF00
+#define UART_MR1_RX_RDY_CTL (1 << 7)
+#define UART_MR1_CTS_CTL (1 << 6)
+
+#define UART_MR2 0x0004
+#define UART_MR2_ERROR_MODE (1 << 6)
+#define UART_MR2_BITS_PER_CHAR 0x30
+#define UART_MR2_BITS_PER_CHAR_5 (0x0 << 4)
+#define UART_MR2_BITS_PER_CHAR_6 (0x1 << 4)
+#define UART_MR2_BITS_PER_CHAR_7 (0x2 << 4)
+#define UART_MR2_BITS_PER_CHAR_8 (0x3 << 4)
+#define UART_MR2_STOP_BIT_LEN_ONE (0x1 << 2)
+#define UART_MR2_STOP_BIT_LEN_TWO (0x3 << 2)
+#define UART_MR2_PARITY_MODE_NONE 0x0
+#define UART_MR2_PARITY_MODE_ODD 0x1
+#define UART_MR2_PARITY_MODE_EVEN 0x2
+#define UART_MR2_PARITY_MODE_SPACE 0x3
+#define UART_MR2_PARITY_MODE 0x3
+
+#define UART_CSR 0x0008
+#define UART_CSR_115200 0xFF
+#define UART_CSR_57600 0xEE
+#define UART_CSR_38400 0xDD
+#define UART_CSR_28800 0xCC
+#define UART_CSR_19200 0xBB
+#define UART_CSR_14400 0xAA
+#define UART_CSR_9600 0x99
+#define UART_CSR_4800 0x77
+#define UART_CSR_2400 0x55
+#define UART_CSR_1200 0x44
+#define UART_CSR_600 0x33
+#define UART_CSR_300 0x22
+
+#define UART_TF 0x000C
++#define UARTDM_TF 0x0070
+
+#define UART_CR 0x0010
+#define UART_CR_CMD_NULL (0 << 4)
+#define UART_CR_CMD_RESET_RX (1 << 4)
+#define UART_CR_CMD_RESET_TX (2 << 4)
+#define UART_CR_CMD_RESET_ERR (3 << 4)
+#define UART_CR_CMD_RESET_BREAK_INT (4 << 4)
+#define UART_CR_CMD_START_BREAK (5 << 4)
+#define UART_CR_CMD_STOP_BREAK (6 << 4)
+#define UART_CR_CMD_RESET_CTS (7 << 4)
++#define UART_CR_CMD_RESET_STALE_INT (8 << 4)
+#define UART_CR_CMD_PACKET_MODE (9 << 4)
+#define UART_CR_CMD_MODE_RESET (12 << 4)
+#define UART_CR_CMD_SET_RFR (13 << 4)
+#define UART_CR_CMD_RESET_RFR (14 << 4)
++#define UART_CR_CMD_PROTECTION_EN (16 << 4)
++#define UART_CR_CMD_STALE_EVENT_ENABLE (80 << 4)
+#define UART_CR_TX_DISABLE (1 << 3)
- #define UART_RF 0x000C
- #define UART_MISR 0x0010
- #define UART_ISR 0x0014
++#define UART_CR_TX_ENABLE (1 << 2)
++#define UART_CR_RX_DISABLE (1 << 1)
++#define UART_CR_RX_ENABLE (1 << 0)
+
+#define UART_IMR 0x0014
+#define UART_IMR_TXLEV (1 << 0)
+#define UART_IMR_RXSTALE (1 << 3)
+#define UART_IMR_RXLEV (1 << 4)
+#define UART_IMR_DELTA_CTS (1 << 5)
+#define UART_IMR_CURRENT_CTS (1 << 6)
+
+#define UART_IPR_RXSTALE_LAST 0x20
+#define UART_IPR_STALE_LSB 0x1F
+#define UART_IPR_STALE_TIMEOUT_MSB 0x3FF80
+
+#define UART_IPR 0x0018
+#define UART_TFWR 0x001C
+#define UART_RFWR 0x0020
+#define UART_HCR 0x0024
+
+#define UART_MREG 0x0028
+#define UART_NREG 0x002C
+#define UART_DREG 0x0030
+#define UART_MNDREG 0x0034
+#define UART_IRDA 0x0038
+#define UART_MISR_MODE 0x0040
+#define UART_MISR_RESET 0x0044
+#define UART_MISR_EXPORT 0x0048
+#define UART_MISR_VAL 0x004C
+#define UART_TEST_CTRL 0x0050
+
+#define UART_SR 0x0008
+#define UART_SR_HUNT_CHAR (1 << 7)
+#define UART_SR_RX_BREAK (1 << 6)
+#define UART_SR_PAR_FRAME_ERR (1 << 5)
+#define UART_SR_OVERRUN (1 << 4)
+#define UART_SR_TX_EMPTY (1 << 3)
+#define UART_SR_TX_READY (1 << 2)
+#define UART_SR_RX_FULL (1 << 1)
+#define UART_SR_RX_READY (1 << 0)
+
++#define UART_RF 0x000C
++#define UARTDM_RF 0x0070
++#define UART_MISR 0x0010
++#define UART_ISR 0x0014
++#define UART_ISR_TX_READY (1 << 7)
++
++#define GSBI_CONTROL 0x0
++#define GSBI_PROTOCOL_CODE 0x30
++#define GSBI_PROTOCOL_UART 0x40
++#define GSBI_PROTOCOL_IDLE 0x0
++
++#define UARTDM_DMRX 0x34
++#define UARTDM_NCF_TX 0x40
++#define UARTDM_RX_TOTAL_SNAP 0x38
+
+#define UART_TO_MSM(uart_port) ((struct msm_port *) uart_port)
+
+static inline
+void msm_write(struct uart_port *port, unsigned int val, unsigned int off)
+{
+ __raw_writel(val, port->membase + off);
+}
+
+static inline
+unsigned int msm_read(struct uart_port *port, unsigned int off)
+{
+ return __raw_readl(port->membase + off);
+}
+
+/*
+ * Setup the MND registers to use the TCXO clock.
+ */
+static inline void msm_serial_set_mnd_regs_tcxo(struct uart_port *port)
+{
+ msm_write(port, 0x06, UART_MREG);
+ msm_write(port, 0xF1, UART_NREG);
+ msm_write(port, 0x0F, UART_DREG);
+ msm_write(port, 0x1A, UART_MNDREG);
+}
+
+/*
+ * Setup the MND registers to use the TCXO clock divided by 4.
+ */
+static inline void msm_serial_set_mnd_regs_tcxoby4(struct uart_port *port)
+{
+ msm_write(port, 0x18, UART_MREG);
+ msm_write(port, 0xF6, UART_NREG);
+ msm_write(port, 0x0F, UART_DREG);
+ msm_write(port, 0x0A, UART_MNDREG);
+}
+
+static inline
+void msm_serial_set_mnd_regs_from_uartclk(struct uart_port *port)
+{
+ if (port->uartclk == 19200000)
+ msm_serial_set_mnd_regs_tcxo(port);
+ else
+ msm_serial_set_mnd_regs_tcxoby4(port);
+}
+
+/*
+ * TROUT has a specific defect that makes it report it's uartclk
+ * as 19.2Mhz (TCXO) when it's actually 4.8Mhz (TCXO/4). This special
+ * cases TROUT to use the right clock.
+ */
+#ifdef CONFIG_MACH_TROUT
+#define msm_serial_set_mnd_regs msm_serial_set_mnd_regs_tcxoby4
+#else
+#define msm_serial_set_mnd_regs msm_serial_set_mnd_regs_from_uartclk
+#endif
+
+#endif /* __DRIVERS_SERIAL_MSM_SERIAL_H */
projects / firefly-linux-kernel-4.4.55.git / commitdiff