u-boot/arch/powerpc/cpu/ppc4xx/cpu_init.c

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/*
* (C) Copyright 2000-2007
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* SPDX-License-Identifier: GPL-2.0+
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*/
#include <common.h>
#include <watchdog.h>
#include <asm/ppc4xx-emac.h>
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#include <asm/processor.h>
#include <asm/ppc4xx-gpio.h>
#include <asm/ppc4xx.h>
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DECLARE_GLOBAL_DATA_PTR;
#ifndef CONFIG_SYS_PLL_RECONFIG
#define CONFIG_SYS_PLL_RECONFIG 0
#endif
#if defined(CONFIG_440EPX) || \
defined(CONFIG_460EX) || defined(CONFIG_460GT)
static void reset_with_rli(void)
{
u32 reg;
/*
* Set reload inhibit so configuration will persist across
* processor resets
*/
mfcpr(CPR0_ICFG, reg);
reg |= CPR0_ICFG_RLI_MASK;
mtcpr(CPR0_ICFG, reg);
/* Reset processor if configuration changed */
__asm__ __volatile__ ("sync; isync");
mtspr(SPRN_DBCR0, 0x20000000);
}
#endif
void reconfigure_pll(u32 new_cpu_freq)
{
#if defined(CONFIG_440EPX)
int reset_needed = 0;
u32 reg, temp;
u32 prbdv0, target_prbdv0, /* CLK_PRIMBD */
fwdva, target_fwdva, fwdvb, target_fwdvb, /* CLK_PLLD */
fbdv, target_fbdv, lfbdv, target_lfbdv,
perdv0, target_perdv0, /* CLK_PERD */
spcid0, target_spcid0; /* CLK_SPCID */
/* Reconfigure clocks if necessary.
* See PPC440EPx User's Manual, sections 8.2 and 14 */
if (new_cpu_freq == 667) {
target_prbdv0 = 2;
target_fwdva = 2;
target_fwdvb = 4;
target_fbdv = 20;
target_lfbdv = 1;
target_perdv0 = 4;
target_spcid0 = 4;
mfcpr(CPR0_PRIMBD0, reg);
temp = (reg & PRBDV_MASK) >> 24;
prbdv0 = temp ? temp : 8;
if (prbdv0 != target_prbdv0) {
reg &= ~PRBDV_MASK;
reg |= ((target_prbdv0 == 8 ? 0 : target_prbdv0) << 24);
mtcpr(CPR0_PRIMBD0, reg);
reset_needed = 1;
}
mfcpr(CPR0_PLLD, reg);
temp = (reg & PLLD_FWDVA_MASK) >> 16;
fwdva = temp ? temp : 16;
temp = (reg & PLLD_FWDVB_MASK) >> 8;
fwdvb = temp ? temp : 8;
temp = (reg & PLLD_FBDV_MASK) >> 24;
fbdv = temp ? temp : 32;
temp = (reg & PLLD_LFBDV_MASK);
lfbdv = temp ? temp : 64;
if (fwdva != target_fwdva || fbdv != target_fbdv || lfbdv != target_lfbdv) {
reg &= ~(PLLD_FWDVA_MASK | PLLD_FWDVB_MASK |
PLLD_FBDV_MASK | PLLD_LFBDV_MASK);
reg |= ((target_fwdva == 16 ? 0 : target_fwdva) << 16) |
((target_fwdvb == 8 ? 0 : target_fwdvb) << 8) |
((target_fbdv == 32 ? 0 : target_fbdv) << 24) |
(target_lfbdv == 64 ? 0 : target_lfbdv);
mtcpr(CPR0_PLLD, reg);
reset_needed = 1;
}
mfcpr(CPR0_PERD, reg);
perdv0 = (reg & CPR0_PERD_PERDV0_MASK) >> 24;
if (perdv0 != target_perdv0) {
reg &= ~CPR0_PERD_PERDV0_MASK;
reg |= (target_perdv0 << 24);
mtcpr(CPR0_PERD, reg);
reset_needed = 1;
}
mfcpr(CPR0_SPCID, reg);
temp = (reg & CPR0_SPCID_SPCIDV0_MASK) >> 24;
spcid0 = temp ? temp : 4;
if (spcid0 != target_spcid0) {
reg &= ~CPR0_SPCID_SPCIDV0_MASK;
reg |= ((target_spcid0 == 4 ? 0 : target_spcid0) << 24);
mtcpr(CPR0_SPCID, reg);
reset_needed = 1;
}
}
/* Get current value of FWDVA.*/
mfcpr(CPR0_PLLD, reg);
temp = (reg & PLLD_FWDVA_MASK) >> 16;
/*
* Check to see if FWDVA has been set to value of 1. if it has we must
* modify it.
*/
if (temp == 1) {
/*
* Load register that contains current boot strapping option.
*/
mfcpr(CPR0_ICFG, reg);
/*
* Strapping option bits (ICS) are already in correct position,
* only masking needed.
*/
reg &= CPR0_ICFG_ICS_MASK;
if ((reg == BOOT_STRAP_OPTION_A) || (reg == BOOT_STRAP_OPTION_B) ||
(reg == BOOT_STRAP_OPTION_D) || (reg == BOOT_STRAP_OPTION_E)) {
mfcpr(CPR0_PLLD, reg);
/* Get current value of fbdv. */
temp = (reg & PLLD_FBDV_MASK) >> 24;
fbdv = temp ? temp : 32;
/* Get current value of lfbdv. */
temp = (reg & PLLD_LFBDV_MASK);
lfbdv = temp ? temp : 64;
/*
* Get current value of FWDVA. Assign current FWDVA to
* new FWDVB.
*/
mfcpr(CPR0_PLLD, reg);
target_fwdvb = (reg & PLLD_FWDVA_MASK) >> 16;
fwdvb = target_fwdvb ? target_fwdvb : 8;
/*
* Get current value of FWDVB. Assign current FWDVB to
* new FWDVA.
*/
target_fwdva = (reg & PLLD_FWDVB_MASK) >> 8;
fwdva = target_fwdva ? target_fwdva : 16;
/*
* Update CPR0_PLLD with switched FWDVA and FWDVB.
*/
reg &= ~(PLLD_FWDVA_MASK | PLLD_FWDVB_MASK |
PLLD_FBDV_MASK | PLLD_LFBDV_MASK);
reg |= ((fwdva == 16 ? 0 : fwdva) << 16) |
((fwdvb == 8 ? 0 : fwdvb) << 8) |
((fbdv == 32 ? 0 : fbdv) << 24) |
(lfbdv == 64 ? 0 : lfbdv);
mtcpr(CPR0_PLLD, reg);
/* Acknowledge that a reset is required. */
reset_needed = 1;
}
}
/* Now reset the CPU if needed */
if (reset_needed)
reset_with_rli();
#endif
#if defined(CONFIG_460EX) || defined(CONFIG_460GT)
u32 reg;
/*
* See "9.2.1.1 Booting with Option E" in the 460EX/GT
* users manual
*/
mfcpr(CPR0_PLLC, reg);
if ((reg & (CPR0_PLLC_RST | CPR0_PLLC_ENG)) == CPR0_PLLC_RST) {
/*
* Set engage bit
*/
reg = (reg & ~CPR0_PLLC_RST) | CPR0_PLLC_ENG;
mtcpr(CPR0_PLLC, reg);
/* Now reset the CPU */
reset_with_rli();
}
#endif
}
#ifdef CONFIG_SYS_4xx_CHIP_21_ERRATA
void
chip_21_errata(void)
{
/*
* See rev 1.09 of the 405EX/405EXr errata. CHIP_21 says that
* sometimes reading the PVR and/or SDR0_ECID results in incorrect
* values. Since the rev-D chip uses the SDR0_ECID bits to control
* internal features, that means the second PCIe or ethernet of an EX
* variant could fail to work. Also, security features of both EX and
* EXr might be incorrectly disabled.
*
* The suggested workaround is as follows (covering rev-C and rev-D):
*
* 1.Read the PVR and SDR0_ECID3.
*
* 2.If the PVR matches an expected Revision C PVR value AND if
* SDR0_ECID3[12:15] is different from PVR[28:31], then processor is
* Revision C: continue executing the initialization code (no reset
* required). else go to step 3.
*
* 3.If the PVR matches an expected Revision D PVR value AND if
* SDR0_ECID3[10:11] matches its expected value, then continue
* executing initialization code, no reset required. else write
* DBCR0[RST] = 0b11 to generate a SysReset.
*/
u32 pvr;
u32 pvr_28_31;
u32 ecid3;
u32 ecid3_10_11;
u32 ecid3_12_15;
/* Step 1: */
pvr = get_pvr();
mfsdr(SDR0_ECID3, ecid3);
/* Step 2: */
pvr_28_31 = pvr & 0xf;
ecid3_10_11 = (ecid3 >> 20) & 0x3;
ecid3_12_15 = (ecid3 >> 16) & 0xf;
if ((pvr == CONFIG_405EX_CHIP21_PVR_REV_C) &&
(pvr_28_31 != ecid3_12_15)) {
/* No reset required. */
return;
}
/* Step 3: */
if ((pvr == CONFIG_405EX_CHIP21_PVR_REV_D) &&
(ecid3_10_11 == CONFIG_405EX_CHIP21_ECID3_REV_D)) {
/* No reset required. */
return;
}
/* Reset required. */
__asm__ __volatile__ ("sync; isync");
mtspr(SPRN_DBCR0, 0x30000000);
}
#endif
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/*
* Breath some life into the CPU...
*
* Reconfigure PLL if necessary,
* set up the memory map,
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* initialize a bunch of registers
*/
void
cpu_init_f (void)
{
#if defined(CONFIG_WATCHDOG) || defined(CONFIG_440GX) || defined(CONFIG_460EX)
u32 val;
#endif
#ifdef CONFIG_SYS_4xx_CHIP_21_ERRATA
chip_21_errata();
#endif
reconfigure_pll(CONFIG_SYS_PLL_RECONFIG);
#if (defined(CONFIG_405EP) || defined (CONFIG_405EX)) && \
!defined(CONFIG_SYS_4xx_GPIO_TABLE)
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/*
* GPIO0 setup (select GPIO or alternate function)
*/
#if defined(CONFIG_SYS_GPIO0_OR)
out32(GPIO0_OR, CONFIG_SYS_GPIO0_OR); /* set initial state of output pins */
#endif
#if defined(CONFIG_SYS_GPIO0_ODR)
out32(GPIO0_ODR, CONFIG_SYS_GPIO0_ODR); /* open-drain select */
#endif
out32(GPIO0_OSRH, CONFIG_SYS_GPIO0_OSRH); /* output select */
out32(GPIO0_OSRL, CONFIG_SYS_GPIO0_OSRL);
out32(GPIO0_ISR1H, CONFIG_SYS_GPIO0_ISR1H); /* input select */
out32(GPIO0_ISR1L, CONFIG_SYS_GPIO0_ISR1L);
out32(GPIO0_TSRH, CONFIG_SYS_GPIO0_TSRH); /* three-state select */
out32(GPIO0_TSRL, CONFIG_SYS_GPIO0_TSRL);
#if defined(CONFIG_SYS_GPIO0_ISR2H)
out32(GPIO0_ISR2H, CONFIG_SYS_GPIO0_ISR2H);
out32(GPIO0_ISR2L, CONFIG_SYS_GPIO0_ISR2L);
#endif
#if defined (CONFIG_SYS_GPIO0_TCR)
out32(GPIO0_TCR, CONFIG_SYS_GPIO0_TCR); /* enable output driver for outputs */
#endif
#endif /* CONFIG_405EP ... && !CONFIG_SYS_4xx_GPIO_TABLE */
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#if defined (CONFIG_405EP)
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/*
* Set EMAC noise filter bits
*/
mtdcr(CPC0_EPCTL, CPC0_EPCTL_E0NFE | CPC0_EPCTL_E1NFE);
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#endif /* CONFIG_405EP */
#if defined(CONFIG_SYS_4xx_GPIO_TABLE)
gpio_set_chip_configuration();
#endif /* CONFIG_SYS_4xx_GPIO_TABLE */
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/*
* External Bus Controller (EBC) Setup
*/
#if (defined(CONFIG_SYS_EBC_PB0AP) && defined(CONFIG_SYS_EBC_PB0CR))
#if (defined(CONFIG_405GP) || \
defined(CONFIG_405EP) || defined(CONFIG_405EZ) || \
defined(CONFIG_405EX) || defined(CONFIG_405))
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/*
* Move the next instructions into icache, since these modify the flash
* we are running from!
*/
asm volatile(" bl 0f" ::: "lr");
asm volatile("0: mflr 3" ::: "r3");
asm volatile(" addi 4, 0, 14" ::: "r4");
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asm volatile(" mtctr 4" ::: "ctr");
asm volatile("1: icbt 0, 3");
asm volatile(" addi 3, 3, 32" ::: "r3");
asm volatile(" bdnz 1b" ::: "ctr", "cr0");
asm volatile(" addis 3, 0, 0x0" ::: "r3");
asm volatile(" ori 3, 3, 0xA000" ::: "r3");
asm volatile(" mtctr 3" ::: "ctr");
asm volatile("2: bdnz 2b" ::: "ctr", "cr0");
#endif
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mtebc(PB0AP, CONFIG_SYS_EBC_PB0AP);
mtebc(PB0CR, CONFIG_SYS_EBC_PB0CR);
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#endif
#if (defined(CONFIG_SYS_EBC_PB1AP) && defined(CONFIG_SYS_EBC_PB1CR) && !(CONFIG_SYS_INIT_DCACHE_CS == 1))
mtebc(PB1AP, CONFIG_SYS_EBC_PB1AP);
mtebc(PB1CR, CONFIG_SYS_EBC_PB1CR);
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#endif
#if (defined(CONFIG_SYS_EBC_PB2AP) && defined(CONFIG_SYS_EBC_PB2CR) && !(CONFIG_SYS_INIT_DCACHE_CS == 2))
mtebc(PB2AP, CONFIG_SYS_EBC_PB2AP);
mtebc(PB2CR, CONFIG_SYS_EBC_PB2CR);
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#endif
#if (defined(CONFIG_SYS_EBC_PB3AP) && defined(CONFIG_SYS_EBC_PB3CR) && !(CONFIG_SYS_INIT_DCACHE_CS == 3))
mtebc(PB3AP, CONFIG_SYS_EBC_PB3AP);
mtebc(PB3CR, CONFIG_SYS_EBC_PB3CR);
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#endif
#if (defined(CONFIG_SYS_EBC_PB4AP) && defined(CONFIG_SYS_EBC_PB4CR) && !(CONFIG_SYS_INIT_DCACHE_CS == 4))
mtebc(PB4AP, CONFIG_SYS_EBC_PB4AP);
mtebc(PB4CR, CONFIG_SYS_EBC_PB4CR);
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#endif
#if (defined(CONFIG_SYS_EBC_PB5AP) && defined(CONFIG_SYS_EBC_PB5CR) && !(CONFIG_SYS_INIT_DCACHE_CS == 5))
mtebc(PB5AP, CONFIG_SYS_EBC_PB5AP);
mtebc(PB5CR, CONFIG_SYS_EBC_PB5CR);
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#endif
#if (defined(CONFIG_SYS_EBC_PB6AP) && defined(CONFIG_SYS_EBC_PB6CR) && !(CONFIG_SYS_INIT_DCACHE_CS == 6))
mtebc(PB6AP, CONFIG_SYS_EBC_PB6AP);
mtebc(PB6CR, CONFIG_SYS_EBC_PB6CR);
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#endif
#if (defined(CONFIG_SYS_EBC_PB7AP) && defined(CONFIG_SYS_EBC_PB7CR) && !(CONFIG_SYS_INIT_DCACHE_CS == 7))
mtebc(PB7AP, CONFIG_SYS_EBC_PB7AP);
mtebc(PB7CR, CONFIG_SYS_EBC_PB7CR);
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#endif
#if defined (CONFIG_SYS_EBC_CFG)
mtebc(EBC0_CFG, CONFIG_SYS_EBC_CFG);
#endif
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#if defined(CONFIG_WATCHDOG)
val = mfspr(SPRN_TCR);
#if defined(CONFIG_440EP) || defined(CONFIG_440GR)
val |= 0xb8000000; /* generate system reset after 1.34 seconds */
#elif defined(CONFIG_440EPX)
val |= 0xb0000000; /* generate system reset after 1.34 seconds */
#else
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val |= 0xf0000000; /* generate system reset after 2.684 seconds */
#endif
#if defined(CONFIG_SYS_4xx_RESET_TYPE)
val &= ~0x30000000; /* clear WRC bits */
val |= CONFIG_SYS_4xx_RESET_TYPE << 28; /* set board specific WRC type */
#endif
mtspr(SPRN_TCR, val);
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val = mfspr(SPRN_TSR);
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val |= 0x80000000; /* enable watchdog timer */
mtspr(SPRN_TSR, val);
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reset_4xx_watchdog();
#endif /* CONFIG_WATCHDOG */
#if defined(CONFIG_440GX)
/* Take the GX out of compatibility mode
* Travis Sawyer, 9 Mar 2004
* NOTE: 440gx user manual inconsistency here
* Compatibility mode and Ethernet Clock select are not
* correct in the manual
*/
mfsdr(SDR0_MFR, val);
val &= ~0x10000000;
mtsdr(SDR0_MFR,val);
#endif /* CONFIG_440GX */
#if defined(CONFIG_460EX)
/*
* Set SDR0_AHB_CFG[A2P_INCR4] (bit 24) and
* clear SDR0_AHB_CFG[A2P_PROT2] (bit 25) for a new 460EX errata
* regarding concurrent use of AHB USB OTG, USB 2.0 host and SATA
*/
mfsdr(SDR0_AHB_CFG, val);
val |= 0x80;
val &= ~0x40;
mtsdr(SDR0_AHB_CFG, val);
mfsdr(SDR0_USB2HOST_CFG, val);
val &= ~0xf00;
val |= 0x400;
mtsdr(SDR0_USB2HOST_CFG, val);
#endif /* CONFIG_460EX */
#if defined(CONFIG_405EX) || \
defined(CONFIG_440SP) || defined(CONFIG_440SPE) || \
defined(CONFIG_460EX) || defined(CONFIG_460GT) || \
defined(CONFIG_460SX)
/*
* Set PLB4 arbiter (Segment 0 and 1) to 4 deep pipeline read
*/
mtdcr(PLB4A0_ACR, (mfdcr(PLB4A0_ACR) & ~PLB4Ax_ACR_RDP_MASK) |
PLB4Ax_ACR_RDP_4DEEP);
mtdcr(PLB4A1_ACR, (mfdcr(PLB4A1_ACR) & ~PLB4Ax_ACR_RDP_MASK) |
PLB4Ax_ACR_RDP_4DEEP);
#endif /* CONFIG_440SP/SPE || CONFIG_460EX/GT || CONFIG_405EX */
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}
/*
* initialize higher level parts of CPU like time base and timers
*/
int cpu_init_r (void)
{
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#if defined(CONFIG_405GP)
uint pvr = get_pvr();
/*
* Set edge conditioning circuitry on PPC405GPr
* for compatibility to existing PPC405GP designs.
*/
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if ((pvr & 0xfffffff0) == (PVR_405GPR_RB & 0xfffffff0)) {
mtdcr(CPC0_ECR, 0x60606000);
}
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#endif /* defined(CONFIG_405GP) */
return 0;
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}
#if defined(CONFIG_PCI) && \
(defined(CONFIG_440EP) || defined(CONFIG_440EPX) || \
defined(CONFIG_440GR) || defined(CONFIG_440GRX))
/*
* 440EP(x)/GR(x) PCI async/sync clocking restriction:
*
* In asynchronous PCI mode, the synchronous PCI clock must meet
* certain requirements. The following equation describes the
* relationship that must be maintained between the asynchronous PCI
* clock and synchronous PCI clock. Select an appropriate PCI:PLB
* ratio to maintain the relationship:
*
* AsyncPCIClk - 1MHz <= SyncPCIclock <= (2 * AsyncPCIClk) - 1MHz
*/
static int ppc4xx_pci_sync_clock_ok(u32 sync, u32 async)
{
if (((async - 1000000) > sync) || (sync > ((2 * async) - 1000000)))
return 0;
else
return 1;
}
int ppc4xx_pci_sync_clock_config(u32 async)
{
sys_info_t sys_info;
u32 sync;
int div;
u32 reg;
u32 spcid_val[] = {
CPR0_SPCID_SPCIDV0_DIV1, CPR0_SPCID_SPCIDV0_DIV2,
CPR0_SPCID_SPCIDV0_DIV3, CPR0_SPCID_SPCIDV0_DIV4 };
get_sys_info(&sys_info);
sync = sys_info.freqPCI;
/*
* First check if the equation above is met
*/
if (!ppc4xx_pci_sync_clock_ok(sync, async)) {
/*
* Reconfigure PCI sync clock to meet the equation.
* Start with highest possible PCI sync frequency
* (divider 1).
*/
for (div = 1; div <= 4; div++) {
sync = sys_info.freqPLB / div;
if (ppc4xx_pci_sync_clock_ok(sync, async))
break;
}
if (div <= 4) {
mtcpr(CPR0_SPCID, spcid_val[div]);
mfcpr(CPR0_ICFG, reg);
reg |= CPR0_ICFG_RLI_MASK;
mtcpr(CPR0_ICFG, reg);
/* do chip reset */
mtspr(SPRN_DBCR0, 0x20000000);
} else {
/* Impossible to configure the PCI sync clock */
return -1;
}
}
return 0;
}
#endif