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android_kernel_motorola_sm6225/arch/powerpc/boot/4xx.c
Benjamin Herrenschmidt 619740384c [POWERPC] 4xx: EP405 boards support for arch/powerpc 
Brings EP405 support to arch/powerpc. The IRQ routing for the CPLD
comes from a device-tree property, PCI is working to the point where
I can see the video card, USB device, and south bridge.

This should work with both EP405 and EP405PC.

I've not totally figured out how IRQs are wired on this hardware
though, thus at this stage, expect only USB interrupts working,
pretty much the same as what arch/ppc did.

Also, the flash, nvram, rtc and temp control still have to be wired.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
2007-12-23 13:13:14 -06:00

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/*
* 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 address 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);
while (mfdcr(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);
}
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_405_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);
}
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