[U-Boot] [PATCH 1/8] dm: lpuart: Add driver model support for the serial driver
Bhuvanchandra DV
bhuvanchandra.dv at toradex.com
Tue Jan 12 05:28:02 CET 2016
Convert lpuart driver to driver model and remove the legacy code.
Signed-off-by: Bhuvanchandra DV <bhuvanchandra.dv at toradex.com>
---
arch/arm/include/asm/arch-vf610/serial.h | 16 ++++
drivers/serial/Kconfig | 6 ++
drivers/serial/serial_lpuart.c | 148 ++++++++++++++++---------------
3 files changed, 97 insertions(+), 73 deletions(-)
create mode 100644 arch/arm/include/asm/arch-vf610/serial.h
diff --git a/arch/arm/include/asm/arch-vf610/serial.h b/arch/arm/include/asm/arch-vf610/serial.h
new file mode 100644
index 0000000..e9ab552
--- /dev/null
+++ b/arch/arm/include/asm/arch-vf610/serial.h
@@ -0,0 +1,16 @@
+/*
+ * Copyright (C) 2016 Toradex, Inc.
+ *
+ * Author: Bhuvanchandra DV <bhuvanchandra.dv at toradex.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef _LPUART_SERIAL_H
+#define _LPUART_SERIAL_H
+
+struct lpuart_serial_platdata {
+ uint32_t base_addr;
+};
+
+#endif
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 1fc287e..56a06a7 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -223,4 +223,10 @@ config UNIPHIER_SERIAL
If you have a UniPhier based board and want to use the on-chip
serial ports, say Y to this option. If unsure, say N.
+config FSL_LPUART
+ bool "Freescale lpuart serial port support"
+ depends on DM_SERIAL
+ help
+ Support for the on-chip lpuart on some Freescale SOCs.
+
endmenu
diff --git a/drivers/serial/serial_lpuart.c b/drivers/serial/serial_lpuart.c
index 63fc388..4724f42 100644
--- a/drivers/serial/serial_lpuart.c
+++ b/drivers/serial/serial_lpuart.c
@@ -5,12 +5,14 @@
*/
#include <common.h>
+#include <dm.h>
#include <watchdog.h>
#include <asm/io.h>
#include <serial.h>
#include <linux/compiler.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/clock.h>
+#include <asm/arch/serial.h>
#define US1_TDRE (1 << 7)
#define US1_RDRF (1 << 5)
@@ -47,26 +49,35 @@
DECLARE_GLOBAL_DATA_PTR;
-struct lpuart_fsl *base = (struct lpuart_fsl *)LPUART_BASE;
+struct lpuart_serial_priv {
+ struct lpuart_fsl *lpuart_base;
+};
#ifndef CONFIG_LPUART_32B_REG
-static void lpuart_serial_setbrg(void)
+int lpuart_serial_setbrg(struct udevice *dev, int baudrate)
{
+ struct lpuart_serial_priv *priv = dev_get_priv(dev);
+ struct lpuart_fsl *base = priv->lpuart_base;
u32 clk = mxc_get_clock(MXC_UART_CLK);
u16 sbr;
if (!gd->baudrate)
- gd->baudrate = CONFIG_BAUDRATE;
+ gd->baudrate = baudrate;
sbr = (u16)(clk / (16 * gd->baudrate));
/* place adjustment later - n/32 BRFA */
__raw_writeb(sbr >> 8, &base->ubdh);
__raw_writeb(sbr & 0xff, &base->ubdl);
+
+ return 0;
}
-static int lpuart_serial_getc(void)
+static int lpuart_serial_getc(struct udevice *dev)
{
+ struct lpuart_serial_priv *priv = dev_get_priv(dev);
+ struct lpuart_fsl *base = priv->lpuart_base;
+
while (!(__raw_readb(&base->us1) & (US1_RDRF | US1_OR)))
WATCHDOG_RESET();
@@ -75,8 +86,11 @@ static int lpuart_serial_getc(void)
return __raw_readb(&base->ud);
}
-static void lpuart_serial_putc(const char c)
+static int lpuart_serial_putc(struct udevice *dev, const char c)
{
+ struct lpuart_serial_priv *priv = dev_get_priv(dev);
+ struct lpuart_fsl *base = priv->lpuart_base;
+
if (c == '\n')
serial_putc('\r');
@@ -84,24 +98,15 @@ static void lpuart_serial_putc(const char c)
WATCHDOG_RESET();
__raw_writeb(c, &base->ud);
-}
-
-/*
- * Test whether a character is in the RX buffer
- */
-static int lpuart_serial_tstc(void)
-{
- if (__raw_readb(&base->urcfifo) == 0)
- return 0;
- return 1;
+ return 0;
}
/*
* Initialise the serial port with the given baudrate. The settings
* are always 8 data bits, no parity, 1 stop bit, no start bits.
*/
-static int lpuart_serial_init(void)
+static int lpuart_serial_init(struct lpuart_fsl *base)
{
u8 ctrl;
@@ -118,29 +123,15 @@ static int lpuart_serial_init(void)
__raw_writeb(0x0, &base->utwfifo);
__raw_writeb(0x1, &base->urwfifo);
__raw_writeb(CFIFO_TXFLUSH | CFIFO_RXFLUSH, &base->ucfifo);
-
- /* provide data bits, parity, stop bit, etc */
-
- serial_setbrg();
-
__raw_writeb(UC2_RE | UC2_TE, &base->uc2);
return 0;
}
-
-static struct serial_device lpuart_serial_drv = {
- .name = "lpuart_serial",
- .start = lpuart_serial_init,
- .stop = NULL,
- .setbrg = lpuart_serial_setbrg,
- .putc = lpuart_serial_putc,
- .puts = default_serial_puts,
- .getc = lpuart_serial_getc,
- .tstc = lpuart_serial_tstc,
-};
-#else
-static void lpuart32_serial_setbrg(void)
+#else /* CONFIG_LPUART_32B_REG */
+int lpuart32_serial_setbrg(struct udevice *dev, int baudrate)
{
+ struct lpuart_serial_priv *priv = dev_get_priv(dev);
+ struct lpuart_fsl *base = priv->lpuart_base;
u32 clk = CONFIG_SYS_CLK_FREQ;
u32 sbr;
@@ -151,10 +142,14 @@ static void lpuart32_serial_setbrg(void)
/* place adjustment later - n/32 BRFA */
out_be32(&base->baud, sbr);
+
+ return 0;
}
-static int lpuart32_serial_getc(void)
+static int lpuart32_serial_getc(struct udevice *dev)
{
+ struct lpuart_serial_priv *priv = dev_get_priv(dev);
+ struct lpuart_fsl *base = priv->lpuart_base;
u32 stat;
while (((stat = in_be32(&base->stat)) & STAT_RDRF) == 0) {
@@ -165,8 +160,11 @@ static int lpuart32_serial_getc(void)
return in_be32(&base->data) & 0x3ff;
}
-static void lpuart32_serial_putc(const char c)
+static int lpuart32_serial_putc(struct udevice *dev, const char c)
{
+ struct lpuart_serial_priv *priv = dev_get_priv(dev);
+ struct lpuart_fsl *base = priv->lpuart_base;
+
if (c == '\n')
serial_putc('\r');
@@ -174,24 +172,15 @@ static void lpuart32_serial_putc(const char c)
WATCHDOG_RESET();
out_be32(&base->data, c);
-}
-/*
- * Test whether a character is in the RX buffer
- */
-static int lpuart32_serial_tstc(void)
-{
- if ((in_be32(&base->water) >> 24) == 0)
- return 0;
-
- return 1;
+ return 0;
}
/*
* Initialise the serial port with the given baudrate. The settings
* are always 8 data bits, no parity, 1 stop bit, no start bits.
*/
-static int lpuart32_serial_init(void)
+static int lpuart32_serial_init(struct lpuart_fsl *base)
{
u8 ctrl;
@@ -204,41 +193,54 @@ static int lpuart32_serial_init(void)
out_be32(&base->fifo, ~(FIFO_TXFE | FIFO_RXFE));
out_be32(&base->match, 0);
- /* provide data bits, parity, stop bit, etc */
-
- serial_setbrg();
-
out_be32(&base->ctrl, CTRL_RE | CTRL_TE);
return 0;
}
+#endif /* CONFIG_LPUART_32B_REG */
-static struct serial_device lpuart32_serial_drv = {
- .name = "lpuart32_serial",
- .start = lpuart32_serial_init,
- .stop = NULL,
- .setbrg = lpuart32_serial_setbrg,
- .putc = lpuart32_serial_putc,
- .puts = default_serial_puts,
- .getc = lpuart32_serial_getc,
- .tstc = lpuart32_serial_tstc,
-};
-#endif
-
-void lpuart_serial_initialize(void)
+static int lpuart_serial_probe(struct udevice *dev)
{
-#ifdef CONFIG_LPUART_32B_REG
- serial_register(&lpuart32_serial_drv);
+ struct lpuart_serial_platdata *plat = dev->platdata;
+ struct lpuart_serial_priv *priv = dev_get_priv(dev);
+
+ priv->lpuart_base = (struct lpuart_fsl *)plat->base_addr;
+#ifndef CONFIG_LPUART_32B_REG
+ lpuart_serial_init(priv->lpuart_base);
#else
- serial_register(&lpuart_serial_drv);
+ lpuart32_serial_init(priv->lpuart_base);
#endif
+ return 0;
}
-__weak struct serial_device *default_serial_console(void)
-{
-#ifdef CONFIG_LPUART_32B_REG
- return &lpuart32_serial_drv;
+#ifndef CONFIG_LPUART_32B_REG
+static const struct dm_serial_ops lpuart_serial_ops = {
+ .putc = lpuart_serial_putc,
+ .getc = lpuart_serial_getc,
+ .setbrg = lpuart_serial_setbrg,
+};
+
+U_BOOT_DRIVER(serial_lpuart) = {
+ .name = "serial_lpuart",
+ .id = UCLASS_SERIAL,
+ .probe = lpuart_serial_probe,
+ .ops = &lpuart_serial_ops,
+ .flags = DM_FLAG_PRE_RELOC,
+ .priv_auto_alloc_size = sizeof(struct lpuart_serial_priv),
+};
#else
- return &lpuart_serial_drv;
+static const struct dm_serial_ops lpuart32_serial_ops = {
+ .putc = lpuart32_serial_putc,
+ .getc = lpuart32_serial_getc,
+ .setbrg = lpuart32_serial_setbrg,
+};
+
+U_BOOT_DRIVER(serial_lpuart32) = {
+ .name = "serial_lpuart32",
+ .id = UCLASS_SERIAL,
+ .probe = lpuart_serial_probe,
+ .ops = &lpuart32_serial_ops,
+ .flags = DM_FLAG_PRE_RELOC,
+ .priv_auto_alloc_size = sizeof(struct lpuart_serial_priv),
+};
#endif
-}
--
2.7.0
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