1001.earlyprintk.patch

sm86xx内核源包括补丁（ GPL ）的

diff -Naur --exclude=CVS --exclude='*.o' --exclude='*.a' --exclude='*.so' --exclude='*.elf' --exclude=System.map --exclude=Makefile.d --exclude='*log' --exclude='*log2' --exclude='*~' --exclude='.*~' --exclude='.#*' --exclude='*.bak' --exclude='*.orig' --exclude='*.rej' --exclude='core.[0-9]*' --exclude=.depend --exclude='.*.o.flags' --exclude='*.gz' --exclude=.depend --exclude='.*.o.flags' --exclude='*.gz' --exclude=vmlinux --exclude=vmlinux.bin --exclude=yamon-02.06-SIGMADESIGNS-01_el.bin linuxmips-2.4.30.ref/kernel/printk.c linuxmips-2.4.30/kernel/printk.c
--- linuxmips-2.4.30.ref/kernel/printk.c	2005-08-01 10:12:30.000000000 -0700
+++ linuxmips-2.4.30/kernel/printk.c	2005-08-01 10:46:24.000000000 -0700
@@ -29,6 +29,11 @@
 
 #include <asm/uaccess.h>
 
+#ifdef CONFIG_TANGO2
+#include <asm/tango2/tango2.h>
+#include <asm/io.h>
+#endif
+
 #if !defined(CONFIG_LOG_BUF_SHIFT) || (CONFIG_LOG_BUF_SHIFT == 0)
 #if defined(CONFIG_MULTIQUAD) || defined(CONFIG_IA64)
 #define LOG_BUF_LEN	(65536)
@@ -384,7 +389,7 @@
 	_call_console_drivers(start_print, end, msg_level);
 }
 
-static void emit_log_char(char c)
+static void emit_log_char_old(char c)
 {
 	LOG_BUF(log_end) = c;
 	log_end++;
@@ -396,6 +401,19 @@
 		logged_chars++;
 }
 
+void Uart16550Put(char byte);
+static void emit_log_char_early(char c)
+{
+	if (c == '\n') { 
+		Uart16550Put('\r'); 
+		Uart16550Put('\n'); 
+	} else { 
+		Uart16550Put(c); 
+	}
+}
+
+static void (*emit_log_char)(char c)=emit_log_char_early;
+
 /*
  * This is printk.  It can be called from any context.  We want it to work.
  * 
@@ -630,6 +648,9 @@
 	if (!(console->flags & CON_ENABLED))
 		return;
 
+	printk("now reverting to conventional printk!\n");
+	emit_log_char=emit_log_char_old;
+
 	/*
 	 *	Put this console in the list - keep the
 	 *	preferred driver at the head of the list.
@@ -700,3 +721,188 @@
 		tty->driver.write(tty, 0, msg, strlen(msg));
 	return;
 }
+
+/* -------------------------- early-printk hack ---------------------- */
+
+/* base addr of uart and clock timing */
+#define         BASE                    KSEG1ADDR(REG_BASE_cpu_block+CPU_UART0_base)
+#define         MAX_BAUD                115200
+
+/* distance in bytes between two serial registers */
+#define         REG_OFFSET              4
+
+/*
+ * 0 - we need to do serial init
+ * 1 - skip serial init
+ */
+static int serialPortInitialized = 0;
+
+/*
+ *  * the default baud rate *if* we do serial init
+ *   */
+#ifdef CONFIG_QUICKTURN
+#define         BAUD_DEFAULT            UART16550_BAUD_1200
+#elif defined(CONFIG_TANGO2_SMP863X)
+#ifndef CONFIG_TANGO2_BASE_BAUD
+#define         BAUD_DEFAULT            UART16550_BAUD_38400
+#else
+#define         BAUD_DEFAULT            CONFIG_TANGO2_BASE_BAUD
+#endif
+#else
+#error not handled yet
+#endif /* CONFIG_QUICKTURN */
+
+/* === END OF CONFIG === */
+
+/* we need uint32 uint8 */
+typedef         unsigned char uint8;
+typedef         unsigned int  uint32;
+
+#define         UART16550_BAUD_1200             1200
+#define         UART16550_BAUD_2400             2400
+#define         UART16550_BAUD_4800             4800
+#define         UART16550_BAUD_9600             9600
+#define         UART16550_BAUD_19200            19200
+#define         UART16550_BAUD_38400            38400
+#define         UART16550_BAUD_57600            57600
+#define         UART16550_BAUD_115200           115200
+
+#define         UART16550_PARITY_NONE           0
+#define         UART16550_PARITY_ODD            0x08
+#define         UART16550_PARITY_EVEN           0x18
+#define         UART16550_PARITY_MARK           0x28
+#define         UART16550_PARITY_SPACE          0x38
+
+#define         UART16550_DATA_5BIT             0x0
+#define         UART16550_DATA_6BIT             0x1
+#define         UART16550_DATA_7BIT             0x2
+#define         UART16550_DATA_8BIT             0x3
+
+#define         UART16550_STOP_1BIT             0x0
+#define         UART16550_STOP_2BIT             0x4
+
+/* register offset */
+#define         OFS_RCV_BUFFER          (0*REG_OFFSET)
+#define         OFS_TRANS_HOLD          (1*REG_OFFSET)
+#define         OFS_SEND_BUFFER         (1*REG_OFFSET)
+#define         OFS_INTR_ENABLE         (2*REG_OFFSET)
+#define         OFS_INTR_ID             (3*REG_OFFSET)
+#define         OFS_DATA_FORMAT         (5*REG_OFFSET)
+#define         OFS_LINE_CONTROL        (5*REG_OFFSET)
+#define         OFS_MODEM_CONTROL       (6*REG_OFFSET)
+#define         OFS_RS232_OUTPUT        (6*REG_OFFSET)
+#define         OFS_LINE_STATUS         (7*REG_OFFSET)
+#define         OFS_MODEM_STATUS        (8*REG_OFFSET)
+#define         OFS_RS232_INPUT         (8*REG_OFFSET)
+#define         OFS_SCRATCH_PAD         (9*REG_OFFSET)
+
+#define         OFS_DIVISOR         (10*REG_OFFSET)
+#define         OFS_CLKSEL          (11*REG_OFFSET)
+#define         OFS_GPIOMODE            (14*REG_OFFSET)
+
+/* memory-mapped read/write of the port */
+#define         UART16550_READ(y)    (*((volatile uint32*)(BASE + y)))
+#define         UART16550_WRITE(y, z)  ((*((volatile uint32*)(BASE + y))) = z)
+
+#ifdef CONFIG_TANGO2_SIG_BLOCK
+extern unsigned long em8xxx_baudrates[2];
+#endif
+
+static unsigned long baud_default = BAUD_DEFAULT;
+
+void Uart16550Init(uint32 baud, uint8 data, uint8 parity, uint8 stop)
+{
+	/* disable interrupts */
+        UART16550_WRITE(OFS_LINE_CONTROL, 0x0);
+	UART16550_WRITE(OFS_INTR_ENABLE, 0);
+
+	/* set up buad rate */
+	{ 
+		uint32 divisor;
+       
+		/* set DIAB bit */
+	        UART16550_WRITE(OFS_LINE_CONTROL, 0x80);
+        
+	        /* set divisor */
+#ifdef CONFIG_QUICKTURN
+		divisor = 0; // no warning this way
+		UART16550_WRITE(OFS_GPIOMODE,0xff00);
+		UART16550_WRITE(OFS_DIVISOR,13); // quickturn (250000 Hz / 16 / 13 = 1201 bits/s)
+#elif defined(CONFIG_TANGO2_SMP863X)
+               {
+#ifdef CONFIG_UART_USE_SYSCLK
+                unsigned long sys_clkgen_pll = gbus_read_uint32(pGBus, REG_BASE_system_block + SYS_clkgen_pll);
+                unsigned long sys_sysclk_mux = gbus_read_uint32(pGBus, REG_BASE_system_block + SYS_sysclk_mux);
+                unsigned long n = sys_clkgen_pll & 0x000003ff;
+                unsigned long m = (sys_clkgen_pll & 0x003f0000) >> 16;
+                unsigned long div_cpu, div_sys, cpu_freq, sys_freq;
+                div_cpu = ((sys_sysclk_mux & 0x300) == 0x300) ? 3 : 2;
+                div_sys = ((sys_sysclk_mux & 0x300) == 0x0) ? 2 : (((sys_sysclk_mux & 0x300) == 0x100) ? 4 : 3);
+                if (sys_sysclk_mux & 0x1) {
+                        cpu_freq = ((TANGO2_BASE_FREQUENCY / (m + 2)) * (n + 2)) / div_cpu;
+                        sys_freq = ((TANGO2_BASE_FREQUENCY / (m + 2)) * (n + 2)) / div_sys;
+                } else {
+                        cpu_freq = TANGO2_BASE_FREQUENCY / div_cpu;
+                        sys_freq = TANGO2_BASE_FREQUENCY / div_sys;
+                }
+
+		divisor = 0; // no warning this way
+		UART16550_WRITE(OFS_GPIOMODE,0x7f00);
+		UART16550_WRITE(OFS_CLKSEL,0x0);
+		UART16550_WRITE(OFS_DIVISOR,sys_freq/(16*baud));
+#else
+		divisor = 0; // no warning this way
+		UART16550_WRITE(OFS_GPIOMODE,0x7f00);
+		UART16550_WRITE(OFS_CLKSEL,0x1);
+		UART16550_WRITE(OFS_DIVISOR,TANGO2_BASE_FREQUENCY/(16*baud));
+#endif
+		}
+#else
+	        divisor = MAX_BAUD / baud;
+        	UART16550_WRITE(OFS_DIVISOR_LSB, divisor & 0xff);
+	        UART16550_WRITE(OFS_DIVISOR_MSB, (divisor & 0xff00)>>8);
+#endif /* CONFIG_QUICKTURN */
+
+        	/* clear DIAB bit */
+	        UART16550_WRITE(OFS_LINE_CONTROL, 0x0);
+	}
+
+	/* set data format */
+	UART16550_WRITE(OFS_DATA_FORMAT, data | parity | stop);
+}
+
+uint8 Uart16550GetPoll(void)
+{
+        if (!serialPortInitialized) {
+#ifdef CONFIG_TANGO2_SIG_BLOCK
+		if (em8xxx_baudrates[0] != 0)
+			baud_default = em8xxx_baudrates[0];
+#endif
+                serialPortInitialized = 1;
+                Uart16550Init(baud_default,
+                              UART16550_DATA_8BIT,
+                              UART16550_PARITY_NONE, UART16550_STOP_1BIT);
+        }
+
+	while((UART16550_READ(OFS_LINE_STATUS) & 0x1) == 0);
+	return UART16550_READ(OFS_RCV_BUFFER);
+}
+
+
+void Uart16550Put(char byte)
+{
+        if (!serialPortInitialized) {
+#ifdef CONFIG_TANGO2_SIG_BLOCK
+		if (em8xxx_baudrates[0] != 0)
+			baud_default = em8xxx_baudrates[0];
+#endif
+                serialPortInitialized = 1;
+                Uart16550Init(baud_default,
+                              UART16550_DATA_8BIT,
+                              UART16550_PARITY_NONE, UART16550_STOP_1BIT);
+        }
+
+	while ((UART16550_READ(OFS_LINE_STATUS) &0x20) == 0);
+	UART16550_WRITE(OFS_SEND_BUFFER, byte);
+}
+
diff -Naur --exclude=CVS --exclude='*.o' --exclude='*.a' --exclude='*.so' --exclude='*.elf' --exclude=System.map --exclude=Makefile.d --exclude='*log' --exclude='*log2' --exclude='*~' --exclude='.*~' --exclude='.#*' --exclude='*.bak' --exclude='*.orig' --exclude='*.rej' --exclude='core.[0-9]*' --exclude=.depend --exclude='.*.o.flags' --exclude='*.gz' --exclude=.depend --exclude='.*.o.flags' --exclude='*.gz' --exclude=vmlinux --exclude=vmlinux.bin --exclude=yamon-02.06-SIGMADESIGNS-01_el.bin linuxmips-2.4.30.ref/README.1001.earlyprintk.patch linuxmips-2.4.30/README.1001.earlyprintk.patch
--- linuxmips-2.4.30.ref/README.1001.earlyprintk.patch	1969-12-31 16:00:00.000000000 -0800
+++ linuxmips-2.4.30/README.1001.earlyprintk.patch	2005-08-01 10:47:40.000000000 -0700
@@ -0,0 +1,19 @@
+Feature:
+--------
+Provides support for printk when serial driver is not yet operational.
+
+Prerequisite patch numbers:
+---------------------------
+0000
+1000
+
+Primary author:
+---------------
+Emmanuel Michon
+
+Related to which chip version SMP863x x=?
+-----------------------------------------
+all
+
+(linux patches) which CONFIG_... are provided:
+----------------------------------------------