SPARC: Added support for SPARC LEON3 SOC processor.

Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>

1 files changed, 254 insertions, 0 deletions

diff --git a/cpu/leon3/cpu_init.c b/cpu/leon3/cpu_init.c
new file mode 100644
index 0000000..4fe7d4b
--- /dev/null
+++ b/cpu/leon3/cpu_init.c
@@ -0,0 +1,254 @@
+/* Initializes CPU and basic hardware such as memory
+ * controllers, IRQ controller and system timer 0.
+ *
+ * (C) Copyright 2007
+ * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com
+ *
+ * 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
+ *
+ */
+
+#include <common.h>
+#include <asm/asi.h>
+#include <asm/leon.h>
+#include <ambapp.h>
+
+#include <config.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* reset CPU (jump to 0, without reset) */
+void start(void);
+
+/* find & initialize the memory controller */
+int init_memory_ctrl(void);
+
+ambapp_dev_irqmp *irqmp = NULL;
+ambapp_dev_mctrl memctrl;
+ambapp_dev_gptimer *gptimer = NULL;
+unsigned int gptimer_irq = 0;
+int leon3_snooping_avail = 0;
+
+struct {
+	gd_t gd_area;
+	bd_t bd;
+} global_data;
+
+/*
+ * Breath some life into the CPU...
+ *
+ * Set up the memory map,
+ * initialize a bunch of registers.
+ *
+ * Run from FLASH/PROM:
+ *  - until memory controller is set up, only registers avaiable
+ *  - no global variables available for writing
+ *  - constants avaiable
+ */
+
+void cpu_init_f(void)
+{
+	/* these varaiable must not be initialized */
+	ambapp_dev_irqmp *irqmp;
+	ambapp_apbdev apbdev;
+	register unsigned int apbmst;
+
+	/* find AMBA APB Master */
+	apbmst = (unsigned int)
+	    ambapp_ahb_next_nomem(VENDOR_GAISLER, GAISLER_APBMST, 1, 0);
+	if (!apbmst) {
+		/*
+		 * no AHB/APB bridge, something is wrong
+		 * ==> jump to start (or hang)
+		 */
+		while (1) ;
+	}
+	/* Init memory controller */
+	if (init_memory_ctrl()) {
+		while (1) ;
+	}
+
+	/****************************************************
+	 * From here we can use the main memory and the stack.
+	 */
+
+	/* Find AMBA APB IRQMP Controller */
+	if (ambapp_apb_first(VENDOR_GAISLER, GAISLER_IRQMP, &apbdev) != 1) {
+		/* no IRQ controller, something is wrong
+		 * ==> jump to start (or hang)
+		 */
+		while (1) ;
+	}
+	irqmp = (ambapp_dev_irqmp *) apbdev.address;
+
+	/* initialize the IRQMP */
+	irqmp->ilevel = 0xf;	/* all IRQ off */
+	irqmp->iforce = 0;
+	irqmp->ipend = 0;
+	irqmp->iclear = 0xfffe;	/* clear all old pending interrupts */
+	irqmp->cpu_mask[0] = 0;	/* mask all IRQs on CPU 0 */
+	irqmp->cpu_force[0] = 0;	/* no force IRQ on CPU 0 */
+
+	/* cache */
+}
+
+void cpu_init_f2(void)
+{
+
+}
+
+/*
+ * initialize higher level parts of CPU like time base and timers
+ */
+int cpu_init_r(void)
+{
+	ambapp_apbdev apbdev;
+
+	/*
+	 * Find AMBA APB IRQMP Controller,
+	 * When we come so far we know there is a IRQMP available
+	 */
+	ambapp_apb_first(VENDOR_GAISLER, GAISLER_IRQMP, &apbdev);
+	irqmp = (ambapp_dev_irqmp *) apbdev.address;
+
+	/* timer */
+	if (ambapp_apb_first(VENDOR_GAISLER, GAISLER_GPTIMER, &apbdev) != 1) {
+		printf("cpu_init_r: gptimer not found!\n");
+		return 1;
+	}
+	gptimer = (ambapp_dev_gptimer *) apbdev.address;
+	gptimer_irq = apbdev.irq;
+
+	/* initialize prescaler common to all timers to 1MHz */
+	gptimer->scalar = gptimer->scalar_reload =
+	    (((CONFIG_SYS_CLK_FREQ / 1000) + 500) / 1000) - 1;
+
+	return (0);
+}
+
+/* find & setup memory controller */
+int init_memory_ctrl()
+{
+	register ambapp_dev_mctrl *mctrl;
+	register ambapp_dev_sdctrl *sdctrl;
+	register ambapp_dev_ddrspa *ddrspa;
+	register ambapp_dev_ddr2spa *ddr2spa;
+	register ahbctrl_pp_dev *ahb;
+	register unsigned int base;
+	register int not_found_mctrl = -1;
+
+	/* find ESA Memory controller */
+	base = ambapp_apb_next_nomem(VENDOR_ESA, ESA_MCTRL, 0);
+	if (base) {
+		mctrl = (ambapp_dev_mctrl *) base;
+
+		/* config MCTRL memory controller */
+		mctrl->mcfg1 = CFG_GRLIB_MEMCFG1 | (mctrl->mcfg1 & 0x300);
+		mctrl->mcfg2 = CFG_GRLIB_MEMCFG2;
+		mctrl->mcfg3 = CFG_GRLIB_MEMCFG3;
+		not_found_mctrl = 0;
+	}
+
+	/* find Gaisler Fault Tolerant Memory controller */
+	base = ambapp_apb_next_nomem(VENDOR_GAISLER, GAISLER_FTMCTRL, 0);
+	if (base) {
+		mctrl = (ambapp_dev_mctrl *) base;
+
+		/* config MCTRL memory controller */
+		mctrl->mcfg1 = CFG_GRLIB_FT_MEMCFG1 | (mctrl->mcfg1 & 0x300);
+		mctrl->mcfg2 = CFG_GRLIB_FT_MEMCFG2;
+		mctrl->mcfg3 = CFG_GRLIB_FT_MEMCFG3;
+		not_found_mctrl = 0;
+	}
+
+	/* find SDRAM controller */
+	base = ambapp_apb_next_nomem(VENDOR_GAISLER, GAISLER_SDCTRL, 0);
+	if (base) {
+		sdctrl = (ambapp_dev_sdctrl *) base;
+
+		/* config memory controller */
+		sdctrl->sdcfg = CFG_GRLIB_SDRAM;
+		not_found_mctrl = 0;
+	}
+
+	ahb = ambapp_ahb_next_nomem(VENDOR_GAISLER, GAISLER_DDR2SPA, 1, 0);
+	if (ahb) {
+		ddr2spa = (ambapp_dev_ddr2spa *) ambapp_ahb_get_info(ahb, 1);
+
+		/* Config DDR2 memory controller */
+		ddr2spa->cfg1 = CFG_GRLIB_DDR2_CFG1;
+		ddr2spa->cfg3 = CFG_GRLIB_DDR2_CFG3;
+		not_found_mctrl = 0;
+	}
+
+	ahb = ambapp_ahb_next_nomem(VENDOR_GAISLER, GAISLER_DDRSPA, 1, 0);
+	if (ahb) {
+		ddrspa = (ambapp_dev_ddrspa *) ambapp_ahb_get_info(ahb, 1);
+
+		/* Config DDR memory controller */
+		ddrspa->ctrl = CFG_GRLIB_DDR_CFG;
+		not_found_mctrl = 0;
+	}
+
+	/* failed to find any memory controller */
+	return not_found_mctrl;
+}
+
+/* Uses Timer 0 to get accurate
+ * pauses. Max 2 raised to 32 ticks
+ *
+ */
+void cpu_wait_ticks(unsigned long ticks)
+{
+	unsigned long start = get_timer(0);
+	while (get_timer(start) < ticks) ;
+}
+
+/* initiate and setup timer0 interrupt to 1MHz
+ * Return irq number for timer int or a negative number for
+ * dealing with self
+ */
+int timer_interrupt_init_cpu(void)
+{
+	/* 1ms ticks */
+	gptimer->e[0].val = 0;
+	gptimer->e[0].rld = 999;	/* (((1000000 / 100) - 1)) */
+	gptimer->e[0].ctrl =
+	    (LEON3_GPTIMER_EN |
+	     LEON3_GPTIMER_RL | LEON3_GPTIMER_LD | LEON3_GPTIMER_IRQEN);
+
+	return gptimer_irq;
+}
+
+/*
+ * This function is intended for SHORT delays only.
+ */
+unsigned long cpu_usec2ticks(unsigned long usec)
+{
+	/* timer set to 1kHz ==> 1 clk tick = 1 msec */
+	if (usec < 1000)
+		return 1;
+	return (usec / 1000);
+}
+
+unsigned long cpu_ticks2usec(unsigned long ticks)
+{
+	/* 1tick = 1usec */
+	return ticks * 1000;
+}