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Merge branch 'msm-uart' into for-next

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* msm-uart:
  serial: msm: Add support for UARTDM cores
  msm: Add name field to UART resources
This commit is contained in:
David Brown 2011-01-24 11:16:43 -08:00
commit c243e52843
5 changed files with 276 additions and 47 deletions
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3
arch/arm/mach-msm/devices-msm7x00.c
View File

@ -38,6 +38,7 @@ static struct resource resources_uart1[] = {
.start = MSM_UART1_PHYS,
.end = MSM_UART1_PHYS + MSM_UART1_SIZE - 1,
.flags = IORESOURCE_MEM,
.name = "uart_resource"
},
};
@ -51,6 +52,7 @@ static struct resource resources_uart2[] = {
.start = MSM_UART2_PHYS,
.end = MSM_UART2_PHYS + MSM_UART2_SIZE - 1,
.flags = IORESOURCE_MEM,
.name = "uart_resource"
},
};
@ -64,6 +66,7 @@ static struct resource resources_uart3[] = {
.start = MSM_UART3_PHYS,
.end = MSM_UART3_PHYS + MSM_UART3_SIZE - 1,
.flags = IORESOURCE_MEM,
.name = "uart_resource"
},
};

3
arch/arm/mach-msm/devices-msm7x30.c
View File

@ -1,6 +1,6 @@
/*
* Copyright (C) 2008 Google, Inc.
* Copyright (c) 2008-2010, Code Aurora Forum. All rights reserved.
* Copyright (c) 2008-2011, 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
@ -41,6 +41,7 @@ static struct resource resources_uart2[] = {
.start = MSM_UART2_PHYS,
.end = MSM_UART2_PHYS + MSM_UART2_SIZE - 1,
.flags = IORESOURCE_MEM,
.name = "uart_resource"
},
};

3
arch/arm/mach-msm/devices-qsd8x50.c
View File

@ -1,6 +1,6 @@
/*
* Copyright (C) 2008 Google, Inc.
* Copyright (c) 2008-2010, Code Aurora Forum. All rights reserved.
* Copyright (c) 2008-2011, 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
@ -38,6 +38,7 @@ static struct resource resources_uart3[] = {
.start = MSM_UART3_PHYS,
.end = MSM_UART3_PHYS + MSM_UART3_SIZE - 1,
.flags = IORESOURCE_MEM,
.name = "uart_resource"
},
};

286
drivers/tty/serial/msm_serial.c
View File

@ -3,6 +3,7 @@
*
* 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
@ -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_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);
@ -73,6 +86,61 @@ 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;
}
/* 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;
@ -121,6 +189,12 @@ 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 +202,18 @@ 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_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 */
@ -140,8 +221,11 @@ 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_uartdm ? UARTDM_TF : UART_TF);
msm_write(port, xmit->buf[xmit->tail], UART_TF);
if (msm_port->is_uartdm)
reset_dm_count(port);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
port->icount.tx++;
@ -169,8 +253,12 @@ 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_uartdm)
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 +280,21 @@ 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)
{
/* 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 +318,7 @@ 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 +373,9 @@ static int msm_set_baud_rate(struct uart_port *port, unsigned int baud)
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 */
@ -288,25 +391,23 @@ 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_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;
}
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 (!IS_ERR(msm_port->pclk))
clk_enable(msm_port->pclk);
msm_serial_set_mnd_regs(port);
}
@ -347,15 +448,31 @@ 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))) {
msm_write(port, UART_CR_CMD_PROTECTION_EN, UART_CR);
msm_reset(port);
data = UART_CR_TX_ENABLE;
}
msm_write(port, 0x05, UART_CR); /* enable TX & RX */
data |= UART_CR_RX_ENABLE;
msm_write(port, data, UART_CR); /* enable TX & RX */
/* 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;
msm_write(port, msm_port->imr, UART_IMR);
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;
}
@ -384,7 +501,7 @@ 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 +571,105 @@ 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 = 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);
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;
if (unlikely(!request_mem_region(port->mapbase, size, "msm_serial")))
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) {
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 = 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;
msm_request_port(port);
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)
@ -515,9 +689,13 @@ static void msm_power(struct uart_port *port, unsigned int state,
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);
@ -550,7 +728,7 @@ 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 +737,7 @@ 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 +763,14 @@ 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_uartdm)
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_uartdm ? UARTDM_TF : UART_TF);
}
static void msm_console_write(struct console *co, const char *s,
@ -609,12 +792,14 @@ 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 +823,11 @@ static int __init msm_console_setup(struct console *co, char *options)
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);
@ -685,14 +875,32 @@ 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))
return PTR_ERR(msm_port->clk);
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(pdev, IORESOURCE_MEM, 0);
resource = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"uart_resource");
if (unlikely(!resource))
return -ENXIO;
port->mapbase = resource->start;

28
drivers/tty/serial/msm_serial.h
View File

@ -3,6 +3,7 @@
*
* 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
@ -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)