Blackfin arch: BF538/9 Linux kernel Support

Add supporing for Blackfin BF538 and BF539 processors.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

1 files changed, 137 insertions, 0 deletions

diff --git a/arch/blackfin/mach-bf538/head.S b/arch/blackfin/mach-bf538/head.S
new file mode 100644
index 000000000000..39013ec97008
--- /dev/null
+++ b/arch/blackfin/mach-bf538/head.S
@@ -0,0 +1,137 @@
+/*
+ * File:         arch/blackfin/mach-bf538/head.S
+ * Based on:
+ * Author:       Jeff Dionne <jeff@uclinux.org> COPYRIGHT 1998 D. Jeff Dionne
+ *
+ * Created:      1998
+ * Description:  bf533 startup file
+ *
+ * Modified:
+ *               Copyright 2004-2006 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>
+#ifdef CONFIG_BFIN_KERNEL_CLOCK
+#include <asm/mach-common/clocks.h>
+#include <asm/mach/mem_init.h>
+#endif
+
+.section .l1.text
+#ifdef CONFIG_BFIN_KERNEL_CLOCK
+ENTRY(_start_dma_code)
+        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           */
+#ifdef ANOMALY_05000265
+        BITSET(r0, 15);                  /* Add 250 mV of hysteresis to SPORT input pins */
+#endif
+
+        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;
+
+        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;
+
+        RTS;
+ENDPROC(_start_dma_code)
+#endif /* CONFIG_BFIN_KERNEL_CLOCK */