summaryrefslogtreecommitdiff
path: root/arch/powerpc/boot/treeboot-walnut.c
diff options
context:
space:
mode:
authorJosh Boyer <jwboyer@linux.vnet.ibm.com>2007-09-07 16:51:44 +0400
committerJosh Boyer <jwboyer@linux.vnet.ibm.com>2007-09-07 16:51:44 +0400
commit5326152fa182b0a16e4abf913ce403e3c7ab53b7 (patch)
tree667ffb6e8436ac8db3f847ba5e019d4b4208749c /arch/powerpc/boot/treeboot-walnut.c
parent545c069ccd76a0f1f3ceacd8ba5bc8f5208eb727 (diff)
downloadlinux-5326152fa182b0a16e4abf913ce403e3c7ab53b7.tar.xz
[POWERPC] Walnut zImage wrapper
Add zImage wrapper for walnut board Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com> Acked-by: David Gibson <david@gibson.dropbear.id.au>
Diffstat (limited to 'arch/powerpc/boot/treeboot-walnut.c')
-rw-r--r--arch/powerpc/boot/treeboot-walnut.c131
1 files changed, 131 insertions, 0 deletions
diff --git a/arch/powerpc/boot/treeboot-walnut.c b/arch/powerpc/boot/treeboot-walnut.c
new file mode 100644
index 000000000000..3adf2d08a230
--- /dev/null
+++ b/arch/powerpc/boot/treeboot-walnut.c
@@ -0,0 +1,131 @@
+/*
+ * Old U-boot compatibility for Walnut
+ *
+ * Author: Josh Boyer <jwboyer@linux.vnet.ibm.com>
+ *
+ * Copyright 2007 IBM Corporation
+ * Based on cuboot-83xx.c, which is:
+ * Copyright (c) 2007 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include "ops.h"
+#include "stdio.h"
+#include "dcr.h"
+#include "4xx.h"
+#include "io.h"
+
+BSS_STACK(4096);
+
+void ibm405gp_fixup_clocks(unsigned int sysclk, unsigned int ser_clk)
+{
+ u32 pllmr = mfdcr(DCRN_CPC0_PLLMR);
+ u32 cpc0_cr0 = mfdcr(DCRN_405_CPC0_CR0);
+ u32 cpc0_cr1 = mfdcr(DCRN_405_CPC0_CR1);
+ u32 cpu, plb, opb, ebc, tb, uart0, uart1, m;
+ u32 fwdv, fbdv, cbdv, opdv, epdv, udiv;
+
+ fwdv = (8 - ((pllmr & 0xe0000000) >> 29));
+ fbdv = (pllmr & 0x1e000000) >> 25;
+ cbdv = ((pllmr & 0x00060000) >> 17) + 1;
+ opdv = ((pllmr & 0x00018000) >> 15) + 1;
+ epdv = ((pllmr & 0x00001800) >> 13) + 2;
+ udiv = ((cpc0_cr0 & 0x3e) >> 1) + 1;
+
+ m = fwdv * fbdv * cbdv;
+
+ cpu = sysclk * m / fwdv;
+ plb = cpu / cbdv;
+ opb = plb / opdv;
+ ebc = plb / epdv;
+
+ if (cpc0_cr0 & 0x80) {
+ /* uart0 uses the external clock */
+ uart0 = ser_clk;
+ } else {
+ uart0 = cpu / udiv;
+ }
+
+ if (cpc0_cr0 & 0x40) {
+ /* uart1 uses the external clock */
+ uart1 = ser_clk;
+ } else {
+ uart1 = cpu / udiv;
+ }
+
+ /* setup the timebase clock to tick at the cpu frequency */
+ cpc0_cr1 = cpc0_cr1 & ~ 0x00800000;
+ mtdcr(DCRN_CPC0_CR1, cpc0_cr1);
+ tb = cpu;
+
+ dt_fixup_cpu_clocks(cpu, tb, 0);
+ dt_fixup_clock("/plb", plb);
+ dt_fixup_clock("/plb/opb", opb);
+ dt_fixup_clock("/plb/ebc", ebc);
+ dt_fixup_clock("/plb/opb/serial@ef600300", uart0);
+ dt_fixup_clock("/plb/opb/serial@ef600400", uart1);
+}
+
+static void walnut_flashsel_fixup(void)
+{
+ void *devp, *sram;
+ u32 reg_flash[3] = {0x0, 0x0, 0x80000};
+ u32 reg_sram[3] = {0x0, 0x0, 0x80000};
+ u8 *fpga;
+ u8 fpga_brds1 = 0x0;
+
+ devp = finddevice("/plb/ebc/fpga");
+ if (!devp)
+ fatal("Couldn't locate FPGA node\n\r");
+
+ if (getprop(devp, "virtual-reg", &fpga, sizeof(fpga)) != sizeof(fpga))
+ fatal("no virtual-reg property\n\r");
+
+ fpga_brds1 = in_8(fpga);
+
+ devp = finddevice("/plb/ebc/flash");
+ if (!devp)
+ fatal("Couldn't locate flash node\n\r");
+
+ if (getprop(devp, "reg", reg_flash, sizeof(reg_flash)) != sizeof(reg_flash))
+ fatal("flash reg property has unexpected size\n\r");
+
+ sram = finddevice("/plb/ebc/sram");
+ if (!sram)
+ fatal("Couldn't locate sram node\n\r");
+
+ if (getprop(sram, "reg", reg_sram, sizeof(reg_sram)) != sizeof(reg_sram))
+ fatal("sram reg property has unexpected size\n\r");
+
+ if (fpga_brds1 & 0x1) {
+ reg_flash[1] ^= 0x80000;
+ reg_sram[1] ^= 0x80000;
+ }
+
+ setprop(devp, "reg", reg_flash, sizeof(reg_flash));
+ setprop(sram, "reg", reg_sram, sizeof(reg_sram));
+}
+
+static void walnut_fixups(void)
+{
+ ibm4xx_fixup_memsize();
+ ibm405gp_fixup_clocks(33330000, 0xa8c000);
+ ibm4xx_quiesce_eth((u32 *)0xef600800, NULL);
+ ibm4xx_fixup_ebc_ranges("/plb/ebc");
+ walnut_flashsel_fixup();
+}
+
+void platform_init(void)
+{
+ unsigned long end_of_ram = 0x2000000;
+ unsigned long avail_ram = end_of_ram - (unsigned long) _end;
+
+ simple_alloc_init(_end, avail_ram, 32, 32);
+ platform_ops.fixups = walnut_fixups;
+ platform_ops.exit = ibm40x_dbcr_reset;
+ ft_init(_dtb_start, _dtb_end - _dtb_start, 32);
+ serial_console_init();
+}