Blackfin arch: add new processor ADSP-BF52x arch/mach support

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

1 files changed, 456 insertions, 0 deletions

diff --git a/arch/blackfin/mach-bf527/head.S b/arch/blackfin/mach-bf527/head.S
new file mode 100644
index 00000000000..cdb00a08496
--- /dev/null
+++ b/arch/blackfin/mach-bf527/head.S
@@ -0,0 +1,456 @@
+/*
+ * File:         arch/blackfin/mach-bf527/head.S
+ * Based on:     arch/blackfin/mach-bf533/head.S
+ * Author:       Jeff Dionne <jeff@uclinux.org> COPYRIGHT 1998 D. Jeff Dionne
+ *
+ * Created:      1998
+ * Description:  Startup code for Blackfin BF537
+ *
+ * Modified:
+ *               Copyright 2004-2007 Analog Devices Inc.
+ *
+ * Bugs:         Enter bugs at http://blackfin.uclinux.org/
+ *
+ * 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <asm/blackfin.h>
+#include <asm/trace.h>
+
+#if CONFIG_BFIN_KERNEL_CLOCK
+#include <asm/mach-common/clocks.h>
+#include <asm/mach/mem_init.h>
+#endif
+
+.global __rambase
+.global __ramstart
+.global __ramend
+.extern ___bss_stop
+.extern ___bss_start
+.extern _bf53x_relocate_l1_mem
+
+#define INITIAL_STACK	0xFFB01000
+
+__INIT
+
+ENTRY(__start)
+	/* R0: argument of command line string, passed from uboot, save it */
+	R7 = R0;
+	/* Enable Cycle Counter and Nesting Of Interrupts */
+#ifdef CONFIG_BFIN_SCRATCH_REG_CYCLES
+	R0 = SYSCFG_SNEN;
+#else
+	R0 = SYSCFG_SNEN | SYSCFG_CCEN;
+#endif
+	SYSCFG = R0;
+	R0 = 0;
+
+	/* Clear Out All the data and pointer Registers */
+	R1 = R0;
+	R2 = R0;
+	R3 = R0;
+	R4 = R0;
+	R5 = R0;
+	R6 = R0;
+
+	P0 = R0;
+	P1 = R0;
+	P2 = R0;
+	P3 = R0;
+	P4 = R0;
+	P5 = R0;
+
+	LC0 = r0;
+	LC1 = r0;
+	L0 = r0;
+	L1 = r0;
+	L2 = r0;
+	L3 = r0;
+
+	/* Clear Out All the DAG Registers */
+	B0 = r0;
+	B1 = r0;
+	B2 = r0;
+	B3 = r0;
+
+	I0 = r0;
+	I1 = r0;
+	I2 = r0;
+	I3 = r0;
+
+	M0 = r0;
+	M1 = r0;
+	M2 = r0;
+	M3 = r0;
+
+	trace_buffer_init(p0,r0);
+	P0 = R1;
+	R0 = R1;
+
+	/* Turn off the icache */
+	p0.l = LO(IMEM_CONTROL);
+	p0.h = HI(IMEM_CONTROL);
+	R1 = [p0];
+	R0 = ~ENICPLB;
+	R0 = R0 & R1;
+
+	/* Anomaly 05000125 */
+#if ANOMALY_05000125
+	CLI R2;
+	SSYNC;
+#endif
+	[p0] = R0;
+	SSYNC;
+#if ANOMALY_05000125
+	STI R2;
+#endif
+
+	/* Turn off the dcache */
+	p0.l = LO(DMEM_CONTROL);
+	p0.h = HI(DMEM_CONTROL);
+	R1 = [p0];
+	R0 = ~ENDCPLB;
+	R0 = R0 & R1;
+
+	/* Anomaly 05000125 */
+#if ANOMALY_05000125
+	CLI R2;
+	SSYNC;
+#endif
+	[p0] = R0;
+	SSYNC;
+#if ANOMALY_05000125
+	STI R2;
+#endif
+
+
+#if defined(CONFIG_BF527)
+	p0.h = hi(EMAC_SYSTAT);
+	p0.l = lo(EMAC_SYSTAT);
+	R0.h = 0xFFFF; /* Clear EMAC Interrupt Status bits */
+	R0.l = 0xFFFF;
+	[P0] = R0;
+	SSYNC;
+#endif
+
+	/* Initialise UART - when booting from u-boot, the UART is not disabled
+	 * so if we dont initalize here, our serial console gets hosed */
+	p0.h = hi(UART1_LCR);
+	p0.l = lo(UART1_LCR);
+	r0 = 0x0(Z);
+	w[p0] = r0.L;	/* To enable DLL writes */
+	ssync;
+
+	p0.h = hi(UART1_DLL);
+	p0.l = lo(UART1_DLL);
+	r0 = 0x0(Z);
+	w[p0] = r0.L;
+	ssync;
+
+	p0.h = hi(UART1_DLH);
+	p0.l = lo(UART1_DLH);
+	r0 = 0x00(Z);
+	w[p0] = r0.L;
+	ssync;
+
+	p0.h = hi(UART1_GCTL);
+	p0.l = lo(UART1_GCTL);
+	r0 = 0x0(Z);
+	w[p0] = r0.L;	/* To enable UART clock */
+	ssync;
+
+	/* Initialize stack pointer */
+	sp.l = lo(INITIAL_STACK);
+	sp.h = hi(INITIAL_STACK);
+	fp = sp;
+	usp = sp;
+
+#ifdef CONFIG_EARLY_PRINTK
+	SP += -12;
+	call _init_early_exception_vectors;
+	SP += 12;
+#endif
+
+	/* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */
+	call _bf53x_relocate_l1_mem;
+#if CONFIG_BFIN_KERNEL_CLOCK
+	call _start_dma_code;
+#endif
+
+	/* Code for initializing Async memory banks */
+
+	p2.h = hi(EBIU_AMBCTL1);
+	p2.l = lo(EBIU_AMBCTL1);
+	r0.h = hi(AMBCTL1VAL);
+	r0.l = lo(AMBCTL1VAL);
+	[p2] = r0;
+	ssync;
+
+	p2.h = hi(EBIU_AMBCTL0);
+	p2.l = lo(EBIU_AMBCTL0);
+	r0.h = hi(AMBCTL0VAL);
+	r0.l = lo(AMBCTL0VAL);
+	[p2] = r0;
+	ssync;
+
+	p2.h = hi(EBIU_AMGCTL);
+	p2.l = lo(EBIU_AMGCTL);
+	r0 = AMGCTLVAL;
+	w[p2] = r0;
+	ssync;
+
+	/* This section keeps the processor in supervisor mode
+	 * during kernel boot.  Switches to user mode at end of boot.
+	 * See page 3-9 of Hardware Reference manual for documentation.
+	 */
+
+	/* EVT15 = _real_start */
+
+	p0.l = lo(EVT15);
+	p0.h = hi(EVT15);
+	p1.l = _real_start;
+	p1.h = _real_start;
+	[p0] = p1;
+	csync;
+
+	p0.l = lo(IMASK);
+	p0.h = hi(IMASK);
+	p1.l = IMASK_IVG15;
+	p1.h = 0x0;
+	[p0] = p1;
+	csync;
+
+	raise 15;
+	p0.l = .LWAIT_HERE;
+	p0.h = .LWAIT_HERE;
+	reti = p0;
+#if ANOMALY_05000281
+	nop; nop; nop;
+#endif
+	rti;
+
+.LWAIT_HERE:
+	jump .LWAIT_HERE;
+ENDPROC(__start)
+
+ENTRY(_real_start)
+	[ -- sp ] = reti;
+	p0.l = lo(WDOG_CTL);
+	p0.h = hi(WDOG_CTL);
+	r0 = 0xAD6(z);
+	w[p0] = r0;	/* watchdog off for now */
+	ssync;
+
+	/* Code update for BSS size == 0
+	 * Zero out the bss region.
+	 */
+
+	p1.l = ___bss_start;
+	p1.h = ___bss_start;
+	p2.l = ___bss_stop;
+	p2.h = ___bss_stop;
+	r0 = 0;
+	p2 -= p1;
+	lsetup (.L_clear_bss, .L_clear_bss) lc0 = p2;
+.L_clear_bss:
+	B[p1++] = r0;
+
+	/* In case there is a NULL pointer reference
+	 * Zero out region before stext
+	 */
+
+	p1.l = 0x0;
+	p1.h = 0x0;
+	r0.l = __stext;
+	r0.h = __stext;
+	r0 = r0 >> 1;
+	p2 = r0;
+	r0 = 0;
+	lsetup (.L_clear_zero, .L_clear_zero) lc0 = p2;
+.L_clear_zero:
+	W[p1++] = r0;
+
+	/* pass the uboot arguments to the global value command line */
+	R0 = R7;
+	call _cmdline_init;
+
+	p1.l = __rambase;
+	p1.h = __rambase;
+	r0.l = __sdata;
+	r0.h = __sdata;
+	[p1] = r0;
+
+	p1.l = __ramstart;
+	p1.h = __ramstart;
+	p3.l = ___bss_stop;
+	p3.h = ___bss_stop;
+
+	r1 = p3;
+	[p1] = r1;
+
+	/*
+	 * load the current thread pointer and stack
+	 */
+	r1.l = _init_thread_union;
+	r1.h = _init_thread_union;
+
+	r2.l = 0x2000;
+	r2.h = 0x0000;
+	r1 = r1 + r2;
+	sp = r1;
+	usp = sp;
+	fp = sp;
+	jump.l _start_kernel;
+ENDPROC(_real_start)
+
+__FINIT
+
+.section .l1.text
+#if CONFIG_BFIN_KERNEL_CLOCK
+ENTRY(_start_dma_code)
+
+	/* Enable PHY CLK buffer output */
+	p0.h = hi(VR_CTL);
+	p0.l = lo(VR_CTL);
+	r0.l = w[p0];
+	bitset(r0, 14);
+	w[p0] = r0.l;
+	ssync;
+
+	p0.h = hi(SIC_IWR0);
+	p0.l = lo(SIC_IWR0);
+	r0.l = 0x1;
+	r0.h = 0x0;
+	[p0] = r0;
+	SSYNC;
+
+	/*
+	 *  Set PLL_CTL
+	 *   - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors
+	 *   - [8]     = BYPASS    : BYPASS the PLL, run CLKIN into CCLK/SCLK
+	 *   - [7]     = output delay (add 200ps of delay to mem signals)
+	 *   - [6]     = input delay (add 200ps of input delay to mem signals)
+	 *   - [5]     = PDWN      : 1=All Clocks off
+	 *   - [3]     = STOPCK    : 1=Core Clock off
+	 *   - [1]     = PLL_OFF   : 1=Disable Power to PLL
+	 *   - [0]     = DF        : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL
+	 *   all other bits set to zero
+	 */
+
+	p0.h = hi(PLL_LOCKCNT);
+	p0.l = lo(PLL_LOCKCNT);
+	r0 = 0x300(Z);
+	w[p0] = r0.l;
+	ssync;
+
+	P2.H = hi(EBIU_SDGCTL);
+	P2.L = lo(EBIU_SDGCTL);
+	R0 = [P2];
+	BITSET (R0, 24);
+	[P2] = R0;
+	SSYNC;
+
+	r0 = CONFIG_VCO_MULT & 63;       /* Load the VCO multiplier         */
+	r0 = r0 << 9;                    /* Shift it over,                  */
+	r1 = CLKIN_HALF;                 /* Do we need to divide CLKIN by 2?*/
+	r0 = r1 | r0;
+	r1 = PLL_BYPASS;                 /* Bypass the PLL?                 */
+	r1 = r1 << 8;                    /* Shift it over                   */
+	r0 = r1 | r0;                    /* add them all together           */
+
+	p0.h = hi(PLL_CTL);
+	p0.l = lo(PLL_CTL);              /* Load the address                */
+	cli r2;                          /* Disable interrupts              */
+	ssync;
+	w[p0] = r0.l;                    /* Set the value                   */
+	idle;                            /* Wait for the PLL to stablize    */
+	sti r2;                          /* Enable interrupts               */
+
+.Lcheck_again:
+	p0.h = hi(PLL_STAT);
+	p0.l = lo(PLL_STAT);
+	R0 = W[P0](Z);
+	CC = BITTST(R0,5);
+	if ! CC jump .Lcheck_again;
+
+	/* Configure SCLK & CCLK Dividers */
+	r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
+	p0.h = hi(PLL_DIV);
+	p0.l = lo(PLL_DIV);
+	w[p0] = r0.l;
+	ssync;
+
+	p0.l = lo(EBIU_SDRRC);
+	p0.h = hi(EBIU_SDRRC);
+	r0 = mem_SDRRC;
+	w[p0] = r0.l;
+	ssync;
+
+	p0.l = LO(EBIU_SDBCTL);
+	p0.h = HI(EBIU_SDBCTL);     /* SDRAM Memory Bank Control Register */
+	r0 = mem_SDBCTL;
+	w[p0] = r0.l;
+	ssync;
+
+	P2.H = hi(EBIU_SDGCTL);
+	P2.L = lo(EBIU_SDGCTL);
+	R0 = [P2];
+	BITCLR (R0, 24);
+	p0.h = hi(EBIU_SDSTAT);
+	p0.l = lo(EBIU_SDSTAT);
+	r2.l = w[p0];
+	cc = bittst(r2,3);
+	if !cc jump .Lskip;
+	NOP;
+	BITSET (R0, 23);
+.Lskip:
+	[P2] = R0;
+	SSYNC;
+
+	R0.L = lo(mem_SDGCTL);
+	R0.H = hi(mem_SDGCTL);
+	R1 = [p2];
+	R1 = R1 | R0;
+	[P2] = R1;
+	SSYNC;
+
+	p0.h = hi(SIC_IWR0);
+	p0.l = lo(SIC_IWR0);
+	r0.l = lo(IWR_ENABLE_ALL);
+	r0.h = hi(IWR_ENABLE_ALL);
+	[p0] = r0;
+	SSYNC;
+
+	RTS;
+ENDPROC(_start_dma_code)
+#endif /* CONFIG_BFIN_KERNEL_CLOCK */
+
+.data
+
+/*
+ * Set up the usable of RAM stuff. Size of RAM is determined then
+ * an initial stack set up at the end.
+ */
+
+.align 4
+__rambase:
+.long   0
+__ramstart:
+.long   0
+__ramend:
+.long   0