1 files changed, 257 insertions, 0 deletions
diff --git a/cpu/arm720t/cpu.c b/cpu/arm720t/cpu.c
new file mode 100755
index 0000000..a5b6de7
--- /dev/null
+++ b/cpu/arm720t/cpu.c
@@ -0,0 +1,257 @@
+/*
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Alex Zuepke <azu@sysgo.de>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/*
+ * CPU specific code
+ */
+
+#include <common.h>
+#include <command.h>
+#include <clps7111.h>
+#include <asm/hardware.h>
+
+int cpu_init (void)
+{
+	/*
+	 * setup up stacks if necessary
+	 */
+#ifdef CONFIG_USE_IRQ
+	IRQ_STACK_START = _armboot_start - CFG_MALLOC_LEN - CFG_GBL_DATA_SIZE - 4;
+	FIQ_STACK_START = IRQ_STACK_START - CONFIG_STACKSIZE_IRQ;
+#endif
+	return 0;
+}
+
+int cleanup_before_linux (void)
+{
+	/*
+	 * this function is called just before we call linux
+	 * it prepares the processor for linux
+	 *
+	 * we turn off caches etc ...
+	 * and we set the CPU-speed to 73 MHz - see start.S for details
+	 */
+
+#if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_ARMADILLO)
+	unsigned long i;
+
+	disable_interrupts ();
+
+	/* turn off I-cache */
+	asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));
+	i &= ~0x1000;
+	asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
+
+	/* flush I-cache */
+	asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
+#ifdef CONFIG_ARM7_REVD
+	/* go to high speed */
+	IO_SYSCON3 = (IO_SYSCON3 & ~CLKCTL) | CLKCTL_73;
+#endif
+#elif defined(CONFIG_NETARM) || defined(CONFIG_S3C4510B)
+	disable_interrupts ();
+	/* Nothing more needed */
+#elif defined(CONFIG_INTEGRATOR) && defined(CONFIG_ARCH_INTEGRATOR)
+	/* No cleanup before linux for IntegratorAP/CM720T as yet */
+#else
+#error No cleanup_before_linux() defined for this CPU type
+#endif
+	return 0;
+}
+
+int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	disable_interrupts ();
+	reset_cpu (0);
+	/*NOTREACHED*/
+	return (0);
+}
+
+/*
+ * Instruction and Data cache enable and disable functions
+ *
+ */
+
+#if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_NETARM) || defined(CONFIG_ARMADILLO)
+/* read co-processor 15, register #1 (control register) */
+static unsigned long read_p15_c1(void)
+{
+	unsigned long value;
+
+	__asm__ __volatile__(
+		"mrc     p15, 0, %0, c1, c0, 0   @ read control reg\n"
+		: "=r" (value)
+		:
+		: "memory");
+	/* printf("p15/c1 is = %08lx\n", value); */
+	return value;
+}
+
+/* write to co-processor 15, register #1 (control register) */
+static void write_p15_c1(unsigned long value)
+{
+	/* printf("write %08lx to p15/c1\n", value); */
+	__asm__ __volatile__(
+		"mcr     p15, 0, %0, c1, c0, 0   @ write it back\n"
+		:
+		: "r" (value)
+		: "memory");
+
+	read_p15_c1();
+}
+
+static void cp_delay (void)
+{
+	volatile int i;
+
+	/* copro seems to need some delay between reading and writing */
+	for (i = 0; i < 100; i++);
+}
+
+/* See also ARM Ref. Man. */
+#define C1_MMU		(1<<0)	/* mmu off/on */
+#define C1_ALIGN	(1<<1)	/* alignment faults off/on */
+#define C1_IDC		(1<<2)	/* icache and/or dcache off/on */
+#define C1_WRITE_BUFFER	(1<<3)	/* write buffer off/on */
+#define C1_BIG_ENDIAN	(1<<7)	/* big endian off/on */
+#define C1_SYS_PROT	(1<<8)	/* system protection */
+#define C1_ROM_PROT	(1<<9)	/* ROM protection */
+#define C1_HIGH_VECTORS	(1<<13)	/* location of vectors: low/high addresses */
+
+void icache_enable (void)
+{
+	ulong reg;
+
+	reg = read_p15_c1 ();
+	cp_delay ();
+	write_p15_c1 (reg | C1_IDC);
+}
+
+void icache_disable (void)
+{
+	ulong reg;
+
+	reg = read_p15_c1 ();
+	cp_delay ();
+	write_p15_c1 (reg & ~C1_IDC);
+}
+
+int icache_status (void)
+{
+	return (read_p15_c1 () & C1_IDC) != 0;
+}
+
+void dcache_enable (void)
+{
+	ulong reg;
+
+	reg = read_p15_c1 ();
+	cp_delay ();
+	write_p15_c1 (reg | C1_IDC);
+}
+
+void dcache_disable (void)
+{
+	ulong reg;
+
+	reg = read_p15_c1 ();
+	cp_delay ();
+	write_p15_c1 (reg & ~C1_IDC);
+}
+
+int dcache_status (void)
+{
+	return (read_p15_c1 () & C1_IDC) != 0;
+}
+
+#elif defined(CONFIG_S3C4510B)
+
+void icache_enable (void)
+{
+	s32 i;
+
+	/* disable all cache bits */
+	CLR_REG( REG_SYSCFG, 0x3F);
+
+	/* 8KB cache, write enable */
+	SET_REG( REG_SYSCFG, CACHE_WRITE_BUFF | CACHE_MODE_01);
+
+	/* clear TAG RAM bits */
+	for ( i = 0; i < 256; i++)
+	  PUT_REG( CACHE_TAG_RAM + 4*i, 0x00000000);
+
+	/* clear SET0 RAM */
+	for(i=0; i < 1024; i++)
+	  PUT_REG( CACHE_SET0_RAM + 4*i, 0x00000000);
+
+	/* clear SET1 RAM */
+	for(i=0; i < 1024; i++)
+	  PUT_REG( CACHE_SET1_RAM + 4*i, 0x00000000);
+
+	/* enable cache */
+	SET_REG( REG_SYSCFG, CACHE_ENABLE);
+
+}
+
+void icache_disable (void)
+{
+	/* disable all cache bits */
+	CLR_REG( REG_SYSCFG, 0x3F);
+}
+
+int icache_status (void)
+{
+	return GET_REG( REG_SYSCFG) & CACHE_ENABLE;
+}
+
+void dcache_enable (void)
+{
+	/* we don't have seperate instruction/data caches */
+	icache_enable();
+}
+
+void dcache_disable (void)
+{
+	/* we don't have seperate instruction/data caches */
+	icache_disable();
+}
+
+int dcache_status (void)
+{
+	/* we don't have seperate instruction/data caches */
+	return icache_status();
+}
+
+#elif defined(CONFIG_INTEGRATOR) && defined(CONFIG_ARCH_INTEGRATOR)
+	/* No specific cache setup for IntegratorAP/CM720T as yet */
+	void icache_enable (void)
+	{
+	}
+#else
+#error No icache/dcache enable/disable functions defined for this CPU type
+#endif