[PATCH 009/011] sh-sci: add early platform support

From: Magnus Damm
Date: Fri Jan 23 2009 - 06:03:07 EST

From: Magnus Damm <damm@xxxxxxxxxx>

This patch removes the old duplicated early serial code and
adds early platform support to the sh-sci driver.

Signed-off-by: Magnus Damm <damm@xxxxxxxxxx>
---

arch/sh/Kconfig.debug | 27 -------
arch/sh/kernel/early_printk.c | 142 -----------------------------------------
drivers/serial/sh-sci.c | 48 +++++++++++--
3 files changed, 41 insertions(+), 176 deletions(-)

--- 0001/arch/sh/Kconfig.debug
+++ work/arch/sh/Kconfig.debug 2009-01-22 17:16:56.000000000 +0900
@@ -19,34 +19,9 @@ config SH_STANDARD_BIOS
mask ROM and no flash (WindowsCE machines fall in this category).
If unsure, say N.

-config EARLY_SCIF_CONSOLE
- bool "Use early SCIF console"
- help
- This enables an early console using a fixed SCIF port. This can
- be used by platforms that are either not running the SH
- standard BIOS, or do not wish to use the BIOS callbacks for the
- serial I/O.
-
-config EARLY_SCIF_CONSOLE_PORT
- hex
- depends on EARLY_SCIF_CONSOLE
- default "0xa4400000" if CPU_SUBTYPE_SH7712 || CPU_SUBTYPE_SH7705
- default "0xa4430000" if CPU_SUBTYPE_SH7720 || CPU_SUBTYPE_SH7721
- default "0xf8420000" if CPU_SUBTYPE_SH7619
- default "0xff804000" if CPU_SUBTYPE_MXG
- default "0xffc30000" if CPU_SUBTYPE_SHX3
- default "0xffe00000" if CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7763 || \
- CPU_SUBTYPE_SH7722 || CPU_SUBTYPE_SH7366 || \
- CPU_SUBTYPE_SH7343
- default "0xffe80000" if CPU_SH4
- default "0xffea0000" if CPU_SUBTYPE_SH7785
- default "0xfffe8000" if CPU_SUBTYPE_SH7203
- default "0xfffe9800" if CPU_SUBTYPE_SH7206 || CPU_SUBTYPE_SH7263
- default "0x00000000"
-
config EARLY_PRINTK
bool "Early printk support"
- depends on SH_STANDARD_BIOS || EARLY_SCIF_CONSOLE
+ depends on SH_STANDARD_BIOS
help
Say Y here to redirect kernel printk messages to the serial port
used by the SH-IPL bootloader, starting very early in the boot
--- 0001/arch/sh/kernel/early_printk.c
+++ work/arch/sh/kernel/early_printk.c 2009-01-22 17:16:56.000000000 +0900
@@ -59,134 +59,6 @@ static struct console bios_console = {
};
#endif

-#ifdef CONFIG_EARLY_SCIF_CONSOLE
-#include <linux/serial_core.h>
-#include "../../../drivers/serial/sh-sci.h"
-
-#if defined(CONFIG_CPU_SUBTYPE_SH7720) || \
- defined(CONFIG_CPU_SUBTYPE_SH7721)
-#define EPK_SCSMR_VALUE 0x000
-#define EPK_SCBRR_VALUE 0x00C
-#define EPK_FIFO_SIZE 64
-#define EPK_FIFO_BITS (0x7f00 >> 8)
-#else
-#define EPK_FIFO_SIZE 16
-#define EPK_FIFO_BITS (0x1f00 >> 8)
-#endif
-
-static struct uart_port scif_port = {
- .type = PORT_SCIF,
- .mapbase = CONFIG_EARLY_SCIF_CONSOLE_PORT,
- .membase = (char __iomem *)CONFIG_EARLY_SCIF_CONSOLE_PORT,
-};
-
-static void scif_sercon_putc(int c)
-{
- while (((sci_in(&scif_port, SCFDR) & EPK_FIFO_BITS) >= EPK_FIFO_SIZE))
- ;
-
- sci_in(&scif_port, SCxSR);
- sci_out(&scif_port, SCxSR, 0xf3 & ~(0x20 | 0x40));
- sci_out(&scif_port, SCxTDR, c);
-
- while ((sci_in(&scif_port, SCxSR) & 0x40) == 0)
- ;
-
- if (c == '\n')
- scif_sercon_putc('\r');
-}
-
-static void scif_sercon_write(struct console *con, const char *s,
- unsigned count)
-{
- while (count-- > 0)
- scif_sercon_putc(*s++);
-}
-
-static int __init scif_sercon_setup(struct console *con, char *options)
-{
- con->cflag = CREAD | HUPCL | CLOCAL | B115200 | CS8;
-
- return 0;
-}
-
-static struct console scif_console = {
- .name = "sercon",
- .write = scif_sercon_write,
- .setup = scif_sercon_setup,
- .flags = CON_PRINTBUFFER,
- .index = -1,
-};
-
-#if !defined(CONFIG_SH_STANDARD_BIOS)
-#if defined(CONFIG_CPU_SUBTYPE_SH7720) || \
- defined(CONFIG_CPU_SUBTYPE_SH7721)
-static void scif_sercon_init(char *s)
-{
- sci_out(&scif_port, SCSCR, 0x0000); /* clear TE and RE */
- sci_out(&scif_port, SCFCR, 0x4006); /* reset */
- sci_out(&scif_port, SCSCR, 0x0000); /* select internal clock */
- sci_out(&scif_port, SCSMR, EPK_SCSMR_VALUE);
- sci_out(&scif_port, SCBRR, EPK_SCBRR_VALUE);
-
- mdelay(1); /* wait 1-bit time */
-
- sci_out(&scif_port, SCFCR, 0x0030); /* TTRG=b'11 */
- sci_out(&scif_port, SCSCR, 0x0030); /* TE, RE */
-}
-#elif defined(CONFIG_CPU_SH4)
-#define DEFAULT_BAUD 115200
-/*
- * Simple SCIF init, primarily aimed at SH7750 and other similar SH-4
- * devices that aren't using sh-ipl+g.
- */
-static void scif_sercon_init(char *s)
-{
- struct uart_port *port = &scif_port;
- unsigned baud = DEFAULT_BAUD;
- unsigned int status;
- char *e;
-
- if (*s == ',')
- ++s;
-
- if (*s) {
- /* ignore ioport/device name */
- s += strcspn(s, ",");
- if (*s == ',')
- s++;
- }
-
- if (*s) {
- baud = simple_strtoul(s, &e, 0);
- if (baud == 0 || s == e)
- baud = DEFAULT_BAUD;
- }
-
- do {
- status = sci_in(port, SCxSR);
- } while (!(status & SCxSR_TEND(port)));
-
- sci_out(port, SCSCR, 0); /* TE=0, RE=0 */
- sci_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST);
- sci_out(port, SCSMR, 0);
-
- /* Set baud rate */
- sci_out(port, SCBRR, (CONFIG_SH_PCLK_FREQ + 16 * baud) /
- (32 * baud) - 1);
- udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */
-
- sci_out(port, SCSPTR, 0);
- sci_out(port, SCxSR, 0x60);
- sci_out(port, SCLSR, 0);
-
- sci_out(port, SCFCR, 0);
- sci_out(port, SCSCR, 0x30); /* TE=1, RE=1 */
-}
-#endif /* defined(CONFIG_CPU_SUBTYPE_SH7720) */
-#endif /* !defined(CONFIG_SH_STANDARD_BIOS) */
-#endif /* CONFIG_EARLY_SCIF_CONSOLE */
-
/*
* Setup a default console, if more than one is compiled in, rely on the
* earlyprintk= parsing to give priority.
@@ -194,8 +66,6 @@ static void scif_sercon_init(char *s)
static struct console *early_console =
#ifdef CONFIG_SH_STANDARD_BIOS
&bios_console
-#elif defined(CONFIG_EARLY_SCIF_CONSOLE)
- &scif_console
#else
NULL
#endif
@@ -215,18 +85,6 @@ static int __init setup_early_printk(cha
if (!strncmp(buf, "bios", 4))
early_console = &bios_console;
#endif
-#if defined(CONFIG_EARLY_SCIF_CONSOLE)
- if (!strncmp(buf, "serial", 6)) {
- early_console = &scif_console;
-
-#if !defined(CONFIG_SH_STANDARD_BIOS)
-#if defined(CONFIG_CPU_SH4) || defined(CONFIG_CPU_SUBTYPE_SH7720) || \
- defined(CONFIG_CPU_SUBTYPE_SH7721)
- scif_sercon_init(buf + 6);
-#endif
-#endif
- }
-#endif

if (likely(early_console)) {
if (keep_early)
--- 0009/drivers/serial/sh-sci.c
+++ work/drivers/serial/sh-sci.c 2009-01-22 17:14:27.000000000 +0900
@@ -1074,10 +1075,13 @@ static void __devinit sci_init_single(st
#endif
sci_port->port.uartclk = CONFIG_CPU_CLOCK;
#elif defined(CONFIG_HAVE_CLK)
- sci_port->iclk = p->clk ? clk_get(&dev->dev, p->clk) : NULL;
- sci_port->dclk = clk_get(&dev->dev, "module_clk");
- sci_port->enable = sci_clk_enable;
- sci_port->disable = sci_clk_disable;
+
+ if (dev) {
+ sci_port->iclk = p->clk ? clk_get(&dev->dev, p->clk) : NULL;
+ sci_port->dclk = clk_get(&dev->dev, "module_clk");
+ sci_port->enable = sci_clk_enable;
+ sci_port->disable = sci_clk_disable;
+ }
#else
#error "Need a valid uartclk"
#endif
@@ -1091,11 +1095,12 @@ static void __devinit sci_init_single(st

sci_port->port.irq = p->irqs[SCIx_TXI_IRQ];
sci_port->port.flags = p->flags;
- sci_port->port.dev = &dev->dev;
sci_port->type = sci_port->port.type = p->type;

memcpy(&sci_port->irqs, &p->irqs, sizeof(p->irqs));

+ if (dev)
+ sci_port->port.dev = &dev->dev;
}

#ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
@@ -1155,9 +1160,14 @@ static int __init serial_console_setup(s
if (co->index >= SCI_NPORTS)
co->index = 0;

- sci_port = &sci_ports[co->index];
- port = &sci_port->port;
- co->data = port;
+ if (co->data) {
+ port = co->data;
+ sci_port = to_sci_port(port);
+ } else {
+ sci_port = &sci_ports[co->index];
+ port = &sci_port->port;
+ co->data = port;
+ }

/*
* Also need to check port->type, we don't actually have any
@@ -1201,6 +1211,15 @@ static int __init sci_console_init(void)
return 0;
}
console_initcall(sci_console_init);
+
+static struct sci_port early_serial_port;
+static struct console early_serial_console = {
+ .name = "early_ttySC",
+ .write = serial_console_write,
+ .setup = serial_console_setup,
+ .flags = CON_PRINTBUFFER | CON_BOOT,
+};
+
#endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */

#if defined(CONFIG_SERIAL_SH_SCI_CONSOLE)
@@ -1289,6 +1308,19 @@ static int __devinit sci_probe(struct pl
struct sh_sci_priv *priv;
int i, ret = -EINVAL;

+ if (is_early_platform_device(dev)) {
+#ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
+ if (dev->id == -1)
+ return -ENOTSUPP;
+
+ early_serial_console.index = dev->id;
+ early_serial_console.data = &early_serial_port.port;
+ sci_init_single(NULL, &early_serial_port, dev->id, p);
+ register_console(&early_serial_console);
+#endif
+ return 0;
+ }
+
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
@@ -1388,6 +1420,7 @@ static void __exit sci_exit(void)
uart_unregister_driver(&sci_uart_driver);
}

+early_platform_init("earlyprintk", &sci_driver);
module_init(sci_init);
module_exit(sci_exit);

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