[U-Boot] [PATCH 0/5] s3c24xx serial driver cleanup patches

[U-Boot] [PATCH 0/5] s3c24xx serial driver cleanup patches

[David Müller]

This is a serie of cleanup patches:                                    

Patch 1-3 remove 3 unused config options and the related dead code from 
several drivers and U-Boot main code.

Patch 4 removes any reference for the 3 unused config options from the 
documentation.

Patch 5 removes another piece of dead, unreferenced code from the 
s3c24xx serial driver.

[U-Boot] [PATCH 1/5] Remove unused CONFIG_MODEM_SUPPORT option and associated dead code.

[David Müller]

Signed-off-by: David M?ller <d.mueller@elsoft.ch>
---
 arch/powerpc/cpu/mpc8xx/serial.c  |  22 ---------
 common/Makefile                   |   1 -
 common/board_f.c                  |   3 --
 common/main.c                     |  14 ------
 common/modem.c                    | 100 --------------------------------------
 drivers/serial/serial_s3c24x0.c   |  18 -------
 include/asm-generic/global_data.h |   4 --
 7 files changed, 162 deletions(-)
 delete mode 100644 common/modem.c

diff --git a/arch/powerpc/cpu/mpc8xx/serial.c b/arch/powerpc/cpu/mpc8xx/serial.c
index af65c96..94c785f 100644
--- a/arch/powerpc/cpu/mpc8xx/serial.c
+++ b/arch/powerpc/cpu/mpc8xx/serial.c
@@ -268,11 +268,6 @@ smc_putc(const char c)
 	volatile cpm8xx_t	*cpmp = &(im->im_cpm);
 	volatile serialbuffer_t	*rtx;
 
-#ifdef CONFIG_MODEM_SUPPORT
-	if (gd->be_quiet)
-		return;
-#endif
-
 	if (c == '\n')
 		smc_putc ('\r');
 
@@ -527,11 +522,6 @@ scc_putc(const char c)
 	volatile immap_t	*im = (immap_t *)CONFIG_SYS_IMMR;
 	volatile cpm8xx_t	*cpmp = &(im->im_cpm);
 
-#ifdef CONFIG_MODEM_SUPPORT
-	if (gd->be_quiet)
-		return;
-#endif
-
 	if (c == '\n')
 		scc_putc ('\r');
 
@@ -637,18 +627,6 @@ void mpc8xx_serial_initialize(void)
 #endif
 }
 
-#ifdef CONFIG_MODEM_SUPPORT
-void disable_putc(void)
-{
-	gd->be_quiet = 1;
-}
-
-void enable_putc(void)
-{
-	gd->be_quiet = 0;
-}
-#endif
-
 #if defined(CONFIG_CMD_KGDB)
 
 void
diff --git a/common/Makefile b/common/Makefile
index 5998411..117178a 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -82,7 +82,6 @@ obj-$(CONFIG_LCD_ROTATION) += lcd_console_rotation.o
 obj-$(CONFIG_LCD_DT_SIMPLEFB) += lcd_simplefb.o
 obj-$(CONFIG_LYNXKDI) += lynxkdi.o
 obj-$(CONFIG_MENU) += menu.o
-obj-$(CONFIG_MODEM_SUPPORT) += modem.o
 obj-$(CONFIG_UPDATE_TFTP) += update.o
 obj-$(CONFIG_DFU_TFTP) += update.o
 obj-$(CONFIG_USB_KEYBOARD) += usb_kbd.o
diff --git a/common/board_f.c b/common/board_f.c
index c470b59..a960144 100644
--- a/common/board_f.c
+++ b/common/board_f.c
@@ -162,9 +162,6 @@ static int display_text_info(void)
 		text_base, bss_start, bss_end);
 #endif
 
-#ifdef CONFIG_MODEM_SUPPORT
-	debug("Modem Support enabled\n");
-#endif
 #ifdef CONFIG_USE_IRQ
 	debug("IRQ Stack: %08lx\n", IRQ_STACK_START);
 	debug("FIQ Stack: %08lx\n", FIQ_STACK_START);
diff --git a/common/main.c b/common/main.c
index 5a03181..1a2ef39 100644
--- a/common/main.c
+++ b/common/main.c
@@ -20,19 +20,6 @@ DECLARE_GLOBAL_DATA_PTR;
  */
 __weak void show_boot_progress(int val) {}
 
-static void modem_init(void)
-{
-#ifdef CONFIG_MODEM_SUPPORT
-	debug("DEBUG: main_loop:   gd->do_mdm_init=%lu\n", gd->do_mdm_init);
-	if (gd->do_mdm_init) {
-		char *str = getenv("mdm_cmd");
-
-		setenv("preboot", str);  /* set or delete definition */
-		mdm_init(); /* wait for modem connection */
-	}
-#endif  /* CONFIG_MODEM_SUPPORT */
-}
-
 static void run_preboot_environment_command(void)
 {
 #ifdef CONFIG_PREBOOT
@@ -66,7 +53,6 @@ void main_loop(void)
 	puts("upgraded by the late 2014 may break or be removed.\n");
 #endif
 
-	modem_init();
 #ifdef CONFIG_VERSION_VARIABLE
 	setenv("ver", version_string);  /* set version variable */
 #endif /* CONFIG_VERSION_VARIABLE */
diff --git a/common/modem.c b/common/modem.c
deleted file mode 100644
index 96b1064..0000000
--- a/common/modem.c
+++ /dev/null
@@ -1,100 +0,0 @@
-/*
- * (C) Copyright 2002-2009
- * Wolfgang Denk, DENX Software Engineering, wd at denx.de.
- *
- * SPDX-License-Identifier:	GPL-2.0+
- */
-
-#include <common.h>
-
-/* 'inline' - We have to do it fast */
-static inline void mdm_readline(char *buf, int bufsiz)
-{
-	char c;
-	char *p;
-	int n;
-
-	n = 0;
-	p = buf;
-	for(;;) {
-		c = serial_getc();
-
-		debug("(%c)", c);
-
-		switch(c) {
-		case '\r':
-			break;
-		case '\n':
-			*p = '\0';
-			return;
-
-		default:
-			if(n++ > bufsiz) {
-				*p = '\0';
-				return; /* sanity check */
-			}
-			*p = c;
-			p++;
-			break;
-		}
-	}
-}
-
-int mdm_init (void)
-{
-	char env_str[16];
-	char *init_str;
-	int i;
-	extern void enable_putc(void);
-	extern int hwflow_onoff(int);
-
-	enable_putc(); /* enable serial_putc() */
-
-#ifdef CONFIG_HWFLOW
-	init_str = getenv("mdm_flow_control");
-	if (init_str && (strcmp(init_str, "rts/cts") == 0))
-		hwflow_onoff (1);
-	else
-		hwflow_onoff(-1);
-#endif
-
-	for (i = 1;;i++) {
-		sprintf(env_str, "mdm_init%d", i);
-		if ((init_str = getenv(env_str)) != NULL) {
-			serial_puts(init_str);
-			serial_puts("\n");
-			for(;;) {
-				mdm_readline(console_buffer, CONFIG_SYS_CBSIZE);
-				debug("ini%d: [%s]", i, console_buffer);
-
-				if ((strcmp(console_buffer, "OK") == 0) ||
-					(strcmp(console_buffer, "ERROR") == 0)) {
-					debug("ini%d: cmd done", i);
-					break;
-				} else /* in case we are originating call ... */
-					if (strncmp(console_buffer, "CONNECT", 7) == 0) {
-						debug("ini%d: connect", i);
-						return 0;
-					}
-			}
-		} else
-			break; /* no init string - stop modem init */
-
-		udelay(100000);
-	}
-
-	udelay(100000);
-
-	/* final stage - wait for connect */
-	for(;i > 1;) { /* if 'i' > 1 - wait for connection
-				  message from modem */
-		mdm_readline(console_buffer, CONFIG_SYS_CBSIZE);
-		debug("ini_f: [%s]", console_buffer);
-		if (strncmp(console_buffer, "CONNECT", 7) == 0) {
-			debug("ini_f: connected");
-			return 0;
-		}
-	}
-
-	return 0;
-}
diff --git a/drivers/serial/serial_s3c24x0.c b/drivers/serial/serial_s3c24x0.c
index 7afc504..4cc94d9 100644
--- a/drivers/serial/serial_s3c24x0.c
+++ b/drivers/serial/serial_s3c24x0.c
@@ -164,30 +164,12 @@ int hwflow_onoff(int on)
 }
 #endif
 
-#ifdef CONFIG_MODEM_SUPPORT
-static int be_quiet = 0;
-void disable_putc(void)
-{
-	be_quiet = 1;
-}
-
-void enable_putc(void)
-{
-	be_quiet = 0;
-}
-#endif
-
-
 /*
  * Output a single byte to the serial port.
  */
 static void _serial_putc(const char c, const int dev_index)
 {
 	struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
-#ifdef CONFIG_MODEM_SUPPORT
-	if (be_quiet)
-		return;
-#endif
 
 	while (!(readl(&uart->utrstat) & 0x2))
 		/* wait for room in the tx FIFO */ ;
diff --git a/include/asm-generic/global_data.h b/include/asm-generic/global_data.h
index a587d3c..f2810a1 100644
--- a/include/asm-generic/global_data.h
+++ b/include/asm-generic/global_data.h
@@ -48,10 +48,6 @@ typedef struct global_data {
 #ifdef CONFIG_PRE_CONSOLE_BUFFER
 	unsigned long precon_buf_idx;	/* Pre-Console buffer index */
 #endif
-#ifdef CONFIG_MODEM_SUPPORT
-	unsigned long do_mdm_init;
-	unsigned long be_quiet;
-#endif
 	unsigned long env_addr;	/* Address  of Environment struct */
 	unsigned long env_valid;	/* Checksum of Environment valid? */
 
-- 
1.8.4

[U-Boot] [PATCH 2/5] Remove unused CONFIG_CMD_HWFLOW option and associated dead code.

[David Müller]

Signed-off-by: David M?ller <d.mueller@elsoft.ch>
---
 cmd/load.c               | 30 ------------------------------
 include/config_cmd_all.h |  1 -
 2 files changed, 31 deletions(-)

diff --git a/cmd/load.c b/cmd/load.c
index 0aa7937..65557e4 100644
--- a/cmd/load.c
+++ b/cmd/load.c
@@ -1081,33 +1081,3 @@ U_BOOT_CMD(
 );
 
 #endif	/* CONFIG_CMD_LOADB */
-
-/* -------------------------------------------------------------------- */
-
-#if defined(CONFIG_CMD_HWFLOW)
-int do_hwflow(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
-{
-	extern int hwflow_onoff(int);
-
-	if (argc == 2) {
-		if (strcmp(argv[1], "off") == 0)
-			hwflow_onoff(-1);
-		else
-			if (strcmp(argv[1], "on") == 0)
-				hwflow_onoff(1);
-			else
-				return CMD_RET_USAGE;
-	}
-	printf("RTS/CTS hardware flow control: %s\n", hwflow_onoff(0) ? "on" : "off");
-	return 0;
-}
-
-/* -------------------------------------------------------------------- */
-
-U_BOOT_CMD(
-	hwflow, 2, 0,	do_hwflow,
-	"turn RTS/CTS hardware flow control in serial line on/off",
-	"[on|off]"
-);
-
-#endif	/* CONFIG_CMD_HWFLOW */
diff --git a/include/config_cmd_all.h b/include/config_cmd_all.h
index 424721b..e858e55 100644
--- a/include/config_cmd_all.h
+++ b/include/config_cmd_all.h
@@ -34,7 +34,6 @@
 #define CONFIG_CMD_FUSE		/* Device fuse support		*/
 #define CONFIG_CMD_GETTIME	/* Get time since boot         */
 #define CONFIG_CMD_HASH		/* calculate hash / digest	*/
-#define CONFIG_CMD_HWFLOW	/* RTS/CTS hw flow control	*/
 #define CONFIG_CMD_I2C		/* I2C serial bus support	*/
 #define CONFIG_CMD_IDE		/* IDE harddisk support		*/
 #define CONFIG_CMD_IMMAP	/* IMMR dump support		*/
-- 
1.8.4

[U-Boot] [PATCH 3/5] Remove unused CONFIG_HWFLOW option and associated dead code.

[David Müller]

Signed-off-by: David M?ller <d.mueller@elsoft.ch>
---
 drivers/serial/serial_imx.c     |  7 -------
 drivers/serial/serial_s3c24x0.c | 35 -----------------------------------
 2 files changed, 42 deletions(-)

diff --git a/drivers/serial/serial_imx.c b/drivers/serial/serial_imx.c
index d43a5fe..8d9166b 100644
--- a/drivers/serial/serial_imx.c
+++ b/drivers/serial/serial_imx.c
@@ -164,13 +164,6 @@ static int imx_serial_getc(void)
 	return ch;
 }
 
-#ifdef CONFIG_HWFLOW
-static int hwflow = 0; /* turned off by default */
-int hwflow_onoff(int on)
-{
-}
-#endif
-
 /*
  * Output a single byte to the serial port.
  */
diff --git a/drivers/serial/serial_s3c24x0.c b/drivers/serial/serial_s3c24x0.c
index 4cc94d9..fb895fd 100644
--- a/drivers/serial/serial_s3c24x0.c
+++ b/drivers/serial/serial_s3c24x0.c
@@ -65,10 +65,6 @@ DECLARE_GLOBAL_DATA_PTR;
 	.puts	= s3serial##port##_puts,		\
 }
 
-#ifdef CONFIG_HWFLOW
-static int hwflow;
-#endif
-
 static void _serial_setbrg(const int dev_index)
 {
 	struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
@@ -95,10 +91,6 @@ static int serial_init_dev(const int dev_index)
 {
 	struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
 
-#ifdef CONFIG_HWFLOW
-	hwflow = 0;	/* turned off by default */
-#endif
-
 	/* FIFO enable, Tx/Rx FIFO clear */
 	writel(0x07, &uart->ufcon);
 	writel(0x0, &uart->umcon);
@@ -111,10 +103,6 @@ static int serial_init_dev(const int dev_index)
 	 */
 	writel(0x245, &uart->ucon);
 
-#ifdef CONFIG_HWFLOW
-	writel(0x1, &uart->umcon);	/* rts up */
-#endif
-
 	/* FIXME: This is sooooooooooooooooooo ugly */
 #if defined(CONFIG_ARCH_GTA02_v1) || defined(CONFIG_ARCH_GTA02_v2)
 	/* we need auto hw flow control on the gsm and gps port */
@@ -146,24 +134,6 @@ static inline int serial_getc_dev(unsigned int dev_index)
 	return _serial_getc(dev_index);
 }
 
-#ifdef CONFIG_HWFLOW
-int hwflow_onoff(int on)
-{
-	switch (on) {
-	case 0:
-	default:
-		break;		/* return current */
-	case 1:
-		hwflow = 1;	/* turn on */
-		break;
-	case -1:
-		hwflow = 0;	/* turn off */
-		break;
-	}
-	return hwflow;
-}
-#endif
-
 /*
  * Output a single byte to the serial port.
  */
@@ -174,11 +144,6 @@ static void _serial_putc(const char c, const int dev_index)
 	while (!(readl(&uart->utrstat) & 0x2))
 		/* wait for room in the tx FIFO */ ;
 
-#ifdef CONFIG_HWFLOW
-	while (hwflow && !(readl(&uart->umstat) & 0x1))
-		/* Wait for CTS up */ ;
-#endif
-
 	writeb(c, &uart->utxh);
 
 	/* If \n, also do \r */
-- 
1.8.4

[U-Boot] [PATCH 4/5] doc: Remove any reference to CONFIG_MODEM_SUPPORT, CONFIG_CMD_HWFLOW, CONFIG_HWFLOW and friends from the documentation.

[David Müller]

Signed-off-by: David M?ller <d.mueller@elsoft.ch>
---
 README           | 28 ----------------------
 doc/README.Modem | 72 --------------------------------------------------------
 2 files changed, 100 deletions(-)
 delete mode 100644 doc/README.Modem

diff --git a/README b/README
index c7c9e0a..9a5be6c 100644
--- a/README
+++ b/README
@@ -1023,7 +1023,6 @@ The following options need to be configured:
 		CONFIG_CMD_GO		* the 'go' command (exec code)
 		CONFIG_CMD_GREPENV	* search environment
 		CONFIG_CMD_HASH		* calculate hash / digest
-		CONFIG_CMD_HWFLOW	* RTS/CTS hw flow control
 		CONFIG_CMD_I2C		* I2C serial bus support
 		CONFIG_CMD_IDE		* IDE harddisk support
 		CONFIG_CMD_IMI		  iminfo
@@ -3712,17 +3711,6 @@ FIT uImage format:
 		CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL
 		payload without any padding, or >= CONFIG_SPL_MAX_SIZE.
 
-Modem Support:
---------------
-
-[so far only for SMDK2400 boards]
-
-- Modem support enable:
-		CONFIG_MODEM_SUPPORT
-
-- RTS/CTS Flow control enable:
-		CONFIG_HWFLOW
-
 - Interrupt support (PPC):
 
 		There are common interrupt_init() and timer_interrupt()
@@ -3736,22 +3724,6 @@ Modem Support:
 		/ other_activity_monitor it works automatically from
 		general timer_interrupt().
 
-- General:
-
-		In the target system modem support is enabled when a
-		specific key (key combination) is pressed during
-		power-on. Otherwise U-Boot will boot normally
-		(autoboot). The key_pressed() function is called from
-		board_init(). Currently key_pressed() is a dummy
-		function, returning 1 and thus enabling modem
-		initialization.
-
-		If there are no modem init strings in the
-		environment, U-Boot proceed to autoboot; the
-		previous output (banner, info printfs) will be
-		suppressed, though.
-
-		See also: doc/README.Modem
 
 Board initialization settings:
 ------------------------------
diff --git a/doc/README.Modem b/doc/README.Modem
deleted file mode 100644
index 1613c11..0000000
--- a/doc/README.Modem
+++ /dev/null
@@ -1,72 +0,0 @@
-How to configure modem support in U-Boot :
-
-1. Define modem initialization strings:
----------------------------------------
-
-The modem initialization strings have following format:
-
-	mdm_init1=<AT-command>
-	mdm_init2=<AT-command>
-	...
-
-Turning off modem verbose responses with ATV0 or ATQ1 is not allowed;
-U-Boot analyzes only verbose (not numeric) result codes. Modem local
-command echo can be turned off (ATE0).
-
-2. RTS/CTS hardware flow control:
----------------------------------
-
-You may wish to enable RTS/CTS hardware flow control, if the board's
-UART driver supports it (see CONFIG_HWFLOW compile-time flag in
-config/<board>.h). This is controlled by the 'mdm_flow_control'
-environment variable:
-
-	'mdm_flow_control=rts/cts'  - to enable RTS/CTS flow control.
-	'mdm_flow_control=none '    - to disable.
-
-
-The following are the examples using a Rockwell OEM modem
-configuration:
-
-SAMSUNG # setenv mdm_init1 ATZ			- reset the modem to
-						  the factory defaults.
-SAMSUNG # setenv mdm_init2 ATS0=1               - set modem into
-						  answer mode.
-SAMSUNG # setenv mdm_flow_control rts/cts       - enable serial port
-						  flow control
-SAMSUNG # saveenv
-
-The example above initializes modem into answer mode to wait for the
-incoming call. RTS/CTS flow control is enabled for the serial port.
-(The RTS/CTS flow control is enabled by default on the modem).
-
-
-SAMSUNG # setenv mdm_init1 ATZ
-SAMSUNG # setenv mdm_init2 ATS39=0+IFC=0,0	- disable modem
-						  RTS/CTS flow control
-SAMSUNG # setenv mdm_init3 ATDT1643973         -  dial out the number
-SAMSUNG # setenv mdm_flow_control none
-SAMSUNG # saveenv
-
-The example above initializes modem to dial-up connection on the
-number 1643973. Flow control is disabled.
-
-Note that flow control must be turned both off or both on for the
-board serial port and for the modem.
-
-
-If the connection was set up successfully, the U-Boot prompt appears
-on the terminal console. If not (U-Boot modem was configured for
-originating the call and connection was not established) - the board
-should be reset for another dial-up try.
-
-
-Note on the SMDK2400 board:
----------------------------
-
-Since the board serial ports does not have DTR signal wired, modem
-should be told to ignore port DTR setting prior to connection to the
-SMDK board, and this setting should be stored in modem NVRAM. For the
-Rockwell OEM modem this can to be done with the following command:
-
-AT&D0&W
-- 
1.8.4

[U-Boot] [PATCH 5/5] s3c24xx: serial: Remove dead code

[David Müller]

Signed-off-by: David M?ller <d.mueller@elsoft.ch>
---
 drivers/serial/serial_s3c24x0.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/serial/serial_s3c24x0.c b/drivers/serial/serial_s3c24x0.c
index fb895fd..d4e7df2 100644
--- a/drivers/serial/serial_s3c24x0.c
+++ b/drivers/serial/serial_s3c24x0.c
@@ -103,12 +103,6 @@ static int serial_init_dev(const int dev_index)
 	 */
 	writel(0x245, &uart->ucon);
 
-	/* FIXME: This is sooooooooooooooooooo ugly */
-#if defined(CONFIG_ARCH_GTA02_v1) || defined(CONFIG_ARCH_GTA02_v2)
-	/* we need auto hw flow control on the gsm and gps port */
-	if (dev_index == 0 || dev_index == 1)
-		writel(0x10, &uart->umcon);
-#endif
 	_serial_setbrg(dev_index);
 
 	return (0);
-- 
1.8.4

[U-Boot] [U-Boot, 1/5] Remove unused CONFIG_MODEM_SUPPORT option and associated dead code.

[Tom Rini]

On Sat, Feb 06, 2016 at 07:57:25AM +0100, David M?ller (ELSOFT AG) wrote:

> Signed-off-by: David M?ller <d.mueller@elsoft.ch>

Applied to u-boot/master, thanks!

-- 
Tom
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[U-Boot] [U-Boot, 2/5] Remove unused CONFIG_CMD_HWFLOW option and associated dead code.

[Tom Rini]

On Sat, Feb 06, 2016 at 07:57:26AM +0100, David M?ller (ELSOFT AG) wrote:

> Signed-off-by: David M?ller <d.mueller@elsoft.ch>

Applied to u-boot/master, thanks!

-- 
Tom
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[U-Boot] [U-Boot, 3/5] Remove unused CONFIG_HWFLOW option and associated dead code.

[Tom Rini]

On Sat, Feb 06, 2016 at 07:57:27AM +0100, David M?ller (ELSOFT AG) wrote:

> Signed-off-by: David M?ller <d.mueller@elsoft.ch>

Applied to u-boot/master, thanks!

-- 
Tom
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[U-Boot] [U-Boot, 4/5] doc: Remove any reference to CONFIG_MODEM_SUPPORT, CONFIG_CMD_HWFLOW, CONFIG_HWFLOW and friends from the documentation.

[Tom Rini]

On Sat, Feb 06, 2016 at 07:57:28AM +0100, David M?ller (ELSOFT AG) wrote:

> Signed-off-by: David M?ller <d.mueller@elsoft.ch>

Applied to u-boot/master, thanks!

-- 
Tom
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[U-Boot] [U-Boot,5/5] s3c24xx: serial: Remove dead code

[Tom Rini]

On Sat, Feb 06, 2016 at 07:57:29AM +0100, David M?ller (ELSOFT AG) wrote:

> Signed-off-by: David M?ller <d.mueller@elsoft.ch>

Applied to u-boot/master, thanks!

-- 
Tom
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