1 files changed, 300 insertions, 0 deletions
diff --git a/arch/powerpc/boot/4xx.c b/arch/powerpc/boot/4xx.c
new file mode 100644
index 00000000000..ebf9e217612
--- /dev/null
+++ b/arch/powerpc/boot/4xx.c
@@ -0,0 +1,300 @@
+/*
+ * Copyright 2007 David Gibson, IBM Corporation.
+ *
+ * Based on earlier code:
+ *   Matt Porter <mporter@kernel.crashing.org>
+ *   Copyright 2002-2005 MontaVista Software Inc.
+ *
+ *   Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
+ *   Copyright (c) 2003, 2004 Zultys Technologies
+ *
+ * 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.
+ */
+#include <stddef.h>
+#include "types.h"
+#include "string.h"
+#include "stdio.h"
+#include "ops.h"
+#include "reg.h"
+#include "dcr.h"
+
+/* Read the 4xx SDRAM controller to get size of system memory. */
+void ibm4xx_fixup_memsize(void)
+{
+	int i;
+	unsigned long memsize, bank_config;
+
+	memsize = 0;
+	for (i = 0; i < ARRAY_SIZE(sdram_bxcr); i++) {
+		mtdcr(DCRN_SDRAM0_CFGADDR, sdram_bxcr[i]);
+		bank_config = mfdcr(DCRN_SDRAM0_CFGDATA);
+
+		if (bank_config & SDRAM_CONFIG_BANK_ENABLE)
+			memsize += SDRAM_CONFIG_BANK_SIZE(bank_config);
+	}
+
+	dt_fixup_memory(0, memsize);
+}
+
+/* 4xx DDR1/2 Denali memory controller support */
+/* DDR0 registers */
+#define DDR0_02			2
+#define DDR0_08			8
+#define DDR0_10			10
+#define DDR0_14			14
+#define DDR0_42			42
+#define DDR0_43			43
+
+/* DDR0_02 */
+#define DDR_START		0x1
+#define DDR_START_SHIFT		0
+#define DDR_MAX_CS_REG		0x3
+#define DDR_MAX_CS_REG_SHIFT	24
+#define DDR_MAX_COL_REG		0xf
+#define DDR_MAX_COL_REG_SHIFT	16
+#define DDR_MAX_ROW_REG		0xf
+#define DDR_MAX_ROW_REG_SHIFT	8
+/* DDR0_08 */
+#define DDR_DDR2_MODE		0x1
+#define DDR_DDR2_MODE_SHIFT	0
+/* DDR0_10 */
+#define DDR_CS_MAP		0x3
+#define DDR_CS_MAP_SHIFT	8
+/* DDR0_14 */
+#define DDR_REDUC		0x1
+#define DDR_REDUC_SHIFT		16
+/* DDR0_42 */
+#define DDR_APIN		0x7
+#define DDR_APIN_SHIFT		24
+/* DDR0_43 */
+#define DDR_COL_SZ		0x7
+#define DDR_COL_SZ_SHIFT	8
+#define DDR_BANK8		0x1
+#define DDR_BANK8_SHIFT		0
+
+#define DDR_GET_VAL(val, mask, shift)	(((val) >> (shift)) & (mask))
+
+static inline u32 mfdcr_sdram0(u32 reg)
+{
+        mtdcr(DCRN_SDRAM0_CFGADDR, reg);
+        return mfdcr(DCRN_SDRAM0_CFGDATA);
+}
+
+void ibm4xx_denali_fixup_memsize(void)
+{
+	u32 val, max_cs, max_col, max_row;
+	u32 cs, col, row, bank, dpath;
+	unsigned long memsize;
+
+	val = mfdcr_sdram0(DDR0_02);
+	if (!DDR_GET_VAL(val, DDR_START, DDR_START_SHIFT))
+		fatal("DDR controller is not initialized\n");
+
+	/* get maximum cs col and row values */
+	max_cs  = DDR_GET_VAL(val, DDR_MAX_CS_REG, DDR_MAX_CS_REG_SHIFT);
+	max_col = DDR_GET_VAL(val, DDR_MAX_COL_REG, DDR_MAX_COL_REG_SHIFT);
+	max_row = DDR_GET_VAL(val, DDR_MAX_ROW_REG, DDR_MAX_ROW_REG_SHIFT);
+
+	/* get CS value */
+	val = mfdcr_sdram0(DDR0_10);
+
+	val = DDR_GET_VAL(val, DDR_CS_MAP, DDR_CS_MAP_SHIFT);
+	cs = 0;
+	while (val) {
+		if (val && 0x1)
+			cs++;
+		val = val >> 1;
+	}
+
+	if (!cs)
+		fatal("No memory installed\n");
+	if (cs > max_cs)
+		fatal("DDR wrong CS configuration\n");
+
+	/* get data path bytes */
+	val = mfdcr_sdram0(DDR0_14);
+
+	if (DDR_GET_VAL(val, DDR_REDUC, DDR_REDUC_SHIFT))
+		dpath = 8; /* 64 bits */
+	else
+		dpath = 4; /* 32 bits */
+
+	/* get adress pins (rows) */
+	val = mfdcr_sdram0(DDR0_42);
+
+	row = DDR_GET_VAL(val, DDR_APIN, DDR_APIN_SHIFT);
+	if (row > max_row)
+		fatal("DDR wrong APIN configuration\n");
+	row = max_row - row;
+
+	/* get collomn size and banks */
+	val = mfdcr_sdram0(DDR0_43);
+
+	col = DDR_GET_VAL(val, DDR_COL_SZ, DDR_COL_SZ_SHIFT);
+	if (col > max_col)
+		fatal("DDR wrong COL configuration\n");
+	col = max_col - col;
+
+	if (DDR_GET_VAL(val, DDR_BANK8, DDR_BANK8_SHIFT))
+		bank = 8; /* 8 banks */
+	else
+		bank = 4; /* 4 banks */
+
+	memsize = cs * (1 << (col+row)) * bank * dpath;
+	dt_fixup_memory(0, memsize);
+}
+
+#define SPRN_DBCR0_40X 0x3F2
+#define SPRN_DBCR0_44X 0x134
+#define DBCR0_RST_SYSTEM 0x30000000
+
+void ibm44x_dbcr_reset(void)
+{
+	unsigned long tmp;
+
+	asm volatile (
+		"mfspr	%0,%1\n"
+		"oris	%0,%0,%2@h\n"
+		"mtspr	%1,%0"
+		: "=&r"(tmp) : "i"(SPRN_DBCR0_44X), "i"(DBCR0_RST_SYSTEM)
+		);
+
+}
+
+void ibm40x_dbcr_reset(void)
+{
+	unsigned long tmp;
+
+	asm volatile (
+		"mfspr	%0,%1\n"
+		"oris	%0,%0,%2@h\n"
+		"mtspr	%1,%0"
+		: "=&r"(tmp) : "i"(SPRN_DBCR0_40X), "i"(DBCR0_RST_SYSTEM)
+		);
+}
+
+#define EMAC_RESET 0x20000000
+void ibm4xx_quiesce_eth(u32 *emac0, u32 *emac1)
+{
+	/* Quiesce the MAL and EMAC(s) since PIBS/OpenBIOS don't do this for us */
+	if (emac0)
+		*emac0 = EMAC_RESET;
+	if (emac1)
+		*emac1 = EMAC_RESET;
+
+	mtdcr(DCRN_MAL0_CFG, MAL_RESET);
+}
+
+/* Read 4xx EBC bus bridge registers to get mappings of the peripheral
+ * banks into the OPB address space */
+void ibm4xx_fixup_ebc_ranges(const char *ebc)
+{
+	void *devp;
+	u32 bxcr;
+	u32 ranges[EBC_NUM_BANKS*4];
+	u32 *p = ranges;
+	int i;
+
+	for (i = 0; i < EBC_NUM_BANKS; i++) {
+		mtdcr(DCRN_EBC0_CFGADDR, EBC_BXCR(i));
+		bxcr = mfdcr(DCRN_EBC0_CFGDATA);
+
+		if ((bxcr & EBC_BXCR_BU) != EBC_BXCR_BU_OFF) {
+			*p++ = i;
+			*p++ = 0;
+			*p++ = bxcr & EBC_BXCR_BAS;
+			*p++ = EBC_BXCR_BANK_SIZE(bxcr);
+		}
+	}
+
+	devp = finddevice(ebc);
+	if (! devp)
+		fatal("Couldn't locate EBC node %s\n\r", ebc);
+
+	setprop(devp, "ranges", ranges, (p - ranges) * sizeof(u32));
+}
+
+#define SPRN_CCR1 0x378
+void ibm440ep_fixup_clocks(unsigned int sysclk, unsigned int ser_clk)
+{
+	u32 cpu, plb, opb, ebc, tb, uart0, m, vco;
+	u32 reg;
+	u32 fwdva, fwdvb, fbdv, lfbdv, opbdv0, perdv0, spcid0, prbdv0, tmp;
+
+	mtdcr(DCRN_CPR0_ADDR, CPR0_PLLD0);
+	reg = mfdcr(DCRN_CPR0_DATA);
+	tmp = (reg & 0x000F0000) >> 16;
+	fwdva = tmp ? tmp : 16;
+	tmp = (reg & 0x00000700) >> 8;
+	fwdvb = tmp ? tmp : 8;
+	tmp = (reg & 0x1F000000) >> 24;
+	fbdv = tmp ? tmp : 32;
+	lfbdv = (reg & 0x0000007F);
+
+	mtdcr(DCRN_CPR0_ADDR, CPR0_OPBD0);
+	reg = mfdcr(DCRN_CPR0_DATA);
+	tmp = (reg & 0x03000000) >> 24;
+	opbdv0 = tmp ? tmp : 4;
+
+	mtdcr(DCRN_CPR0_ADDR, CPR0_PERD0);
+	reg = mfdcr(DCRN_CPR0_DATA);
+	tmp = (reg & 0x07000000) >> 24;
+	perdv0 = tmp ? tmp : 8;
+
+	mtdcr(DCRN_CPR0_ADDR, CPR0_PRIMBD0);
+	reg = mfdcr(DCRN_CPR0_DATA);
+	tmp = (reg & 0x07000000) >> 24;
+	prbdv0 = tmp ? tmp : 8;
+
+	mtdcr(DCRN_CPR0_ADDR, CPR0_SCPID);
+	reg = mfdcr(DCRN_CPR0_DATA);
+	tmp = (reg & 0x03000000) >> 24;
+	spcid0 = tmp ? tmp : 4;
+
+	/* Calculate M */
+	mtdcr(DCRN_CPR0_ADDR, CPR0_PLLC0);
+	reg = mfdcr(DCRN_CPR0_DATA);
+	tmp = (reg & 0x03000000) >> 24;
+	if (tmp == 0) { /* PLL output */
+		tmp = (reg & 0x20000000) >> 29;
+		if (!tmp) /* PLLOUTA */
+			m = fbdv * lfbdv * fwdva;
+		else
+			m = fbdv * lfbdv * fwdvb;
+	}
+	else if (tmp == 1) /* CPU output */
+		m = fbdv * fwdva;
+	else
+		m = perdv0 * opbdv0 * fwdvb;
+
+	vco = (m * sysclk) + (m >> 1);
+	cpu = vco / fwdva;
+	plb = vco / fwdvb / prbdv0;
+	opb = plb / opbdv0;
+	ebc = plb / perdv0;
+
+	/* FIXME */
+	uart0 = ser_clk;
+
+	/* Figure out timebase.  Either CPU or default TmrClk */
+	asm volatile (
+			"mfspr	%0,%1\n"
+			:
+			"=&r"(reg) : "i"(SPRN_CCR1));
+	if (reg & 0x0080)
+		tb = 25000000; /* TmrClk is 25MHz */
+	else
+		tb = cpu;
+
+	dt_fixup_cpu_clocks(cpu, tb, 0);
+	dt_fixup_clock("/plb", plb);
+	dt_fixup_clock("/plb/opb", opb);
+	dt_fixup_clock("/plb/opb/ebc", ebc);
+	dt_fixup_clock("/plb/opb/serial@ef600300", uart0);
+	dt_fixup_clock("/plb/opb/serial@ef600400", uart0);
+	dt_fixup_clock("/plb/opb/serial@ef600500", uart0);
+	dt_fixup_clock("/plb/opb/serial@ef600600", uart0);
+}