Hi Stepan,
A couple of pedantic comments inline, otherwise looks good to me.
Jamie
On Tue, Jan 18, 2011 at 07:26:25PM -0800, Stepan Moskovchenko wrote:
> Add support for the next-generation version of the MSM UART
> to the msm_serial driver. This version of the hardware is
> similar to the original version, but has some DMA
> capabilities that are used in PIO mode in this driver.
>
> Signed-off-by: Stepan Moskovchenko <stepanm@xxxxxxxxxxxxxx>
> ---
> drivers/serial/msm_serial.c | 289 +++++++++++++++++++++++++++++++++++++------
> drivers/serial/msm_serial.h | 28 ++++-
> 2 files changed, 274 insertions(+), 43 deletions(-)
>
> diff --git a/drivers/serial/msm_serial.c b/drivers/serial/msm_serial.c
> index 8e43a7b..5027415 100644
> --- a/drivers/serial/msm_serial.c
> +++ b/drivers/serial/msm_serial.c
> @@ -3,6 +3,7 @@
> *
> * Copyright (C) 2007 Google, Inc.
> * Author: Robert Love <rlove@xxxxxxxxxx>
> + * 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
> @@ -31,6 +32,7 @@
> #include <linux/serial.h>
> #include <linux/clk.h>
> #include <linux/platform_device.h>
> +#include <linux/delay.h>
>
> #include "msm_serial.h"
>
> @@ -38,9 +40,20 @@ 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_dm;
> + unsigned int old_snap_state;
> };
Out of interest, what does .is_dm mean? Is that obvious to someone who
knows about msm?
>
> +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();
> +}
Is it worth adding a timeout in here?
> +
> static void msm_stop_tx(struct uart_port *port)
> {
> struct msm_port *msm_port = UART_TO_MSM(port);
> @@ -73,6 +86,68 @@ static void msm_enable_ms(struct uart_port *port)
> 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;
> + }
> +
> + while (count > 0) {
> + unsigned int c;
> + char flag = TTY_NORMAL;
> +
> + 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++;
> + } 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;
It doesn't look like the flag is used anywhere after it has been
assigned.
> +
> + /* 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;
> @@ -121,6 +196,12 @@ static void handle_rx(struct uart_port *port)
> 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;
> @@ -128,11 +209,18 @@ static void handle_tx(struct uart_port *port)
> int sent_tx;
>
> if (port->x_char) {
> - msm_write(port, port->x_char, UART_TF);
> + if (msm_port->is_dm)
> + reset_dm_count(port);
> +
> + msm_write(port, port->x_char,
> + msm_port->is_dm ? UARTDM_TF : UART_TF);
> port->icount.tx++;
> port->x_char = 0;
> }
>
> + if (msm_port->is_dm)
> + reset_dm_count(port);
> +
> while (msm_read(port, UART_SR) & UART_SR_TX_READY) {
> if (uart_circ_empty(xmit)) {
> /* disable tx interrupts */
> @@ -140,8 +228,11 @@ static void handle_tx(struct uart_port *port)
> msm_write(port, msm_port->imr, UART_IMR);
> break;
> }
> + msm_write(port, xmit->buf[xmit->tail],
> + msm_port->is_dm ? UARTDM_TF : UART_TF);
>
> - msm_write(port, xmit->buf[xmit->tail], UART_TF);
> + if (msm_port->is_dm)
> + reset_dm_count(port);
>
> xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
> port->icount.tx++;
> @@ -169,8 +260,12 @@ static irqreturn_t msm_irq(int irq, void *dev_id)
> misr = msm_read(port, UART_MISR);
> msm_write(port, 0, UART_IMR); /* disable interrupt */
>
> - if (misr & (UART_IMR_RXLEV | UART_IMR_RXSTALE))
> - handle_rx(port);
> + if (misr & (UART_IMR_RXLEV | UART_IMR_RXSTALE)) {
> + if (msm_port->is_dm)
> + handle_rx_dm(port, misr);
> + else
> + handle_rx(port);
> + }
> if (misr & UART_IMR_TXLEV)
> handle_tx(port);
> if (misr & UART_IMR_DELTA_CTS)
> @@ -192,10 +287,21 @@ static unsigned int msm_get_mctrl(struct uart_port *port)
> return TIOCM_CAR | TIOCM_CTS | TIOCM_DSR | TIOCM_RTS;
> }
>
> -static void msm_set_mctrl(struct uart_port *port, unsigned int mctrl)
> +
> +static void msm_reset(struct uart_port *port)
> {
> - unsigned int mr;
> + /* 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)) {
> @@ -219,6 +325,7 @@ static void msm_break_ctl(struct uart_port *port, int break_ctl)
> 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:
> @@ -273,6 +380,9 @@ static int msm_set_baud_rate(struct uart_port *port, unsigned int baud)
> break;
> }
>
> + if (msm_port->is_dm)
> + msm_write(port, UART_CR_CMD_RESET_RX, UART_CR);
> +
> msm_write(port, baud_code, UART_CSR);
>
> /* RX stale watermark */
> @@ -288,25 +398,23 @@ static int msm_set_baud_rate(struct uart_port *port, unsigned int baud)
> /* set TX watermark */
> msm_write(port, 10, UART_TFWR);
>
> + if (msm_port->is_dm) {
> + 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;
> }
>
> -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);
> -}
>
> static void msm_init_clock(struct uart_port *port)
> {
> struct msm_port *msm_port = UART_TO_MSM(port);
>
> clk_enable(msm_port->clk);
> + if (msm_port->pclk)
> + clk_enable(msm_port->pclk);
NULL is a valid clk, so this should really be something like
if (!IS_ERR(mem_port->pclk)
clk_enable(...);
> msm_serial_set_mnd_regs(port);
> }
>
> @@ -347,15 +455,32 @@ static int msm_startup(struct uart_port *port)
> msm_write(port, data, UART_IPR);
> }
>
> - msm_reset(port);
> + data = 0;
> + if ((!port->cons) ||
> + (port->cons && (!(port->cons->flags & CON_ENABLED)))) {
Safe to remove the extra parentheses here.
> + 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, 0x05, UART_CR); /* enable TX & RX */
> + /* Make sure IPR is not 0 to start with*/
> + if (msm_port->is_dm)
> + 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;
> - msm_write(port, msm_port->imr, UART_IMR);
>
> + if (msm_port->is_dm) {
> + 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;
> }
>
> @@ -384,7 +509,7 @@ static void msm_set_termios(struct uart_port *port, struct ktermios *termios,
> baud = msm_set_baud_rate(port, baud);
> if (tty_termios_baud_rate(termios))
> tty_termios_encode_baud_rate(termios, baud, baud);
> -
> +
> /* calculate parity */
> mr = msm_read(port, UART_MR2);
> mr &= ~UART_MR2_PARITY_MODE;
> @@ -454,48 +579,105 @@ static const char *msm_type(struct uart_port *port)
> static void msm_release_port(struct uart_port *port)
> {
> struct platform_device *pdev = to_platform_device(port->dev);
> - struct resource *resource;
> + struct msm_port *msm_port = UART_TO_MSM(port);
> + struct resource *uart_resource;
> + struct resource *gsbi_resource;
> resource_size_t size;
>
> - resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> - if (unlikely(!resource))
> + uart_resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (unlikely(!uart_resource))
> return;
> - size = resource->end - resource->start + 1;
> + size = uart_resource->end - uart_resource->start + 1;
resource_size()?
>
> 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 = gsbi_resource->end - gsbi_resource->start + 1;
resource_size()?
> + 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);
> - struct resource *resource;
> + struct resource *uart_resource;
> + struct resource *gsbi_resource;
> resource_size_t size;
> + int ret;
>
> - resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> - if (unlikely(!resource))
> + uart_resource = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> + "uart_resource");
> + if (unlikely(!uart_resource))
> return -ENXIO;
> - size = resource->end - resource->start + 1;
> +
> + size = uart_resource->end - uart_resource->start + 1;
resource_size()?
>
> if (unlikely(!request_mem_region(port->mapbase, size, "msm_serial")))
> return -EBUSY;
>
> port->membase = ioremap(port->mapbase, size);
> if (!port->membase) {
> - release_mem_region(port->mapbase, size);
> - return -EBUSY;
> + 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 = gsbi_resource->end - gsbi_resource->start + 1;
resource_size()?
> +
> + if (unlikely(!request_mem_region(gsbi_resource->start, size,
> + "msm_serial"))) {
> + ret = -EBUSY;
> + goto fail_release_port;
> + }
Is the unlikely() really worth it in this sort of path? More
particularly, why is request_mem_region() more special than the other
calls that can fail here?
> +
> + 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;
> - msm_request_port(port);
> + ret = msm_request_port(port);
> + if (ret)
> + return;
> }
> +
> + if (msm_port->is_dm)
> + iowrite32(GSBI_PROTOCOL_UART, msm_port->gsbi_base +
> + GSBI_CONTROL);
> }
>
> static int msm_verify_port(struct uart_port *port, struct serial_struct *ser)
> @@ -515,9 +697,13 @@ static void msm_power(struct uart_port *port, unsigned int state,
> switch (state) {
> case 0:
> clk_enable(msm_port->clk);
> + if (msm_port->pclk)
> + clk_enable(msm_port->pclk);
if (!IS_ERR(msm_port->pclk))
> break;
> case 3:
> clk_disable(msm_port->clk);
> + if (msm_port->pclk)
> + clk_disable(msm_port->pclk);
if (!IS_ERR(msm_port->pclk))
> break;
> default:
> printk(KERN_ERR "msm_serial: Unknown PM state %d\n", state);
> @@ -550,7 +736,7 @@ static struct msm_port msm_uart_ports[] = {
> .iotype = UPIO_MEM,
> .ops = &msm_uart_pops,
> .flags = UPF_BOOT_AUTOCONF,
> - .fifosize = 512,
> + .fifosize = 64,
> .line = 0,
> },
> },
> @@ -559,7 +745,7 @@ static struct msm_port msm_uart_ports[] = {
> .iotype = UPIO_MEM,
> .ops = &msm_uart_pops,
> .flags = UPF_BOOT_AUTOCONF,
> - .fifosize = 512,
> + .fifosize = 64,
> .line = 1,
> },
> },
> @@ -585,9 +771,14 @@ static inline struct uart_port *get_port_from_line(unsigned int line)
>
> static void msm_console_putchar(struct uart_port *port, int c)
> {
> + struct msm_port *msm_port = UART_TO_MSM(port);
> +
> + if (msm_port->is_dm)
> + reset_dm_count(port);
> +
> while (!(msm_read(port, UART_SR) & UART_SR_TX_READY))
> ;
> - msm_write(port, c, UART_TF);
> + msm_write(port, c, msm_port->is_dm ? UARTDM_TF : UART_TF);
> }
>
> static void msm_console_write(struct console *co, const char *s,
> @@ -609,12 +800,14 @@ static void msm_console_write(struct console *co, const char *s,
> 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;
> @@ -638,6 +831,11 @@ static int __init msm_console_setup(struct console *co, char *options)
>
> msm_reset(port);
>
> + if (msm_port->is_dm) {
> + 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);
> @@ -685,14 +883,31 @@ static int __init msm_serial_probe(struct platform_device *pdev)
> port->dev = &pdev->dev;
> msm_port = UART_TO_MSM(port);
>
> - msm_port->clk = clk_get(&pdev->dev, "uart_clk");
> - if (IS_ERR(msm_port->clk))
> + if (platform_get_resource_byname(pdev, IORESOURCE_MEM, "gsbi_resource"))
> + msm_port->is_dm = 1;
> + else
> + msm_port->is_dm = 0;
> +
> + if (msm_port->is_dm) {
> + 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 = NULL;
> + }
> +
> + if (unlikely(IS_ERR(msm_port->clk) || IS_ERR(msm_port->pclk)))
> return PTR_ERR(msm_port->clk);
> +
> + if (msm_port->is_dm)
> + 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(pdev, IORESOURCE_MEM, 0);
> + resource = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> + "uart_resource");
> if (unlikely(!resource))
> return -ENXIO;
> port->mapbase = resource->start;
> diff --git a/drivers/serial/msm_serial.h b/drivers/serial/msm_serial.h
> index f6ca9ca..9b8dc5d 100644
> --- a/drivers/serial/msm_serial.h
> +++ b/drivers/serial/msm_serial.h
> @@ -3,6 +3,7 @@
> *
> * Copyright (C) 2007 Google, Inc.
> * Author: Robert Love <rlove@xxxxxxxxxx>
> + * 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
> @@ -54,6 +55,7 @@
> #define UART_CSR_300 0x22
>
> #define UART_TF 0x000C
> +#define UARTDM_TF 0x0070
>
> #define UART_CR 0x0010
> #define UART_CR_CMD_NULL (0 << 4)
> @@ -64,14 +66,17 @@
> #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_CR_TX_ENABLE (1 << 3)
> -#define UART_CR_RX_DISABLE (1 << 3)
> -#define UART_CR_RX_ENABLE (1 << 3)
> +#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)
> @@ -110,9 +115,20 @@
> #define UART_SR_RX_FULL (1 << 1)
> #define UART_SR_RX_READY (1 << 0)
>
> -#define UART_RF 0x000C
> -#define UART_MISR 0x0010
> -#define UART_ISR 0x0014
> +#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)
>
> --
> Sent by an employee of the Qualcomm Innovation Center, Inc.
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
>
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