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-rw-r--r--cpu/ppc4xx/405gp_enet.c6
-rw-r--r--cpu/ppc4xx/405gp_pci.c2
-rw-r--r--cpu/ppc4xx/cpu.c40
-rw-r--r--cpu/ppc4xx/cpu_init.c27
-rw-r--r--cpu/ppc4xx/miiphy.c2
-rw-r--r--cpu/ppc4xx/spd_sdram.c46
-rw-r--r--cpu/ppc4xx/speed.c125
-rw-r--r--cpu/ppc4xx/start.S177
8 files changed, 404 insertions, 21 deletions
diff --git a/cpu/ppc4xx/405gp_enet.c b/cpu/ppc4xx/405gp_enet.c
index 49e9e42..af3c1b7 100644
--- a/cpu/ppc4xx/405gp_enet.c
+++ b/cpu/ppc4xx/405gp_enet.c
@@ -80,7 +80,7 @@
#include <malloc.h>
#include "vecnum.h"
-#if defined(CONFIG_405GP) || defined(CONFIG_440)
+#if defined(CONFIG_405GP) || defined(CONFIG_440) || defined(CONFIG_405EP)
#define EMAC_RESET_TIMEOUT 1000 /* 1000 ms reset timeout */
#define PHY_AUTONEGOTIATE_TIMEOUT 2000 /* 2000 ms autonegotiate timeout */
@@ -705,7 +705,7 @@ void mal_err (unsigned long isr, unsigned long uic, unsigned long maldef,
mtdcr (maltxdeir, 0xC0000000);
mtdcr (malrxdeir, 0x80000000);
-#if 1 /*sr */
+#ifdef INFO_405_ENET
printf ("\nMAL error occured.... ISR = %lx UIC = = %lx MAL_DEF = %lx MAL_ERR= %lx \n",
isr, uic, maldef, mal_errr);
#else
@@ -716,7 +716,7 @@ void mal_err (unsigned long isr, unsigned long uic, unsigned long maldef,
*/
printf ("M"); /* just to see something upon mal error */
#endif
-#endif /*sr */
+#endif
eth_init (bis_save); /* start again... */
}
diff --git a/cpu/ppc4xx/405gp_pci.c b/cpu/ppc4xx/405gp_pci.c
index fbd4d6d..7289523 100644
--- a/cpu/ppc4xx/405gp_pci.c
+++ b/cpu/ppc4xx/405gp_pci.c
@@ -78,7 +78,7 @@
#include <asm/processor.h>
#include <pci.h>
-#if defined(CONFIG_405GP)
+#if defined(CONFIG_405GP) || defined(CONFIG_405EP)
#ifdef CONFIG_PCI
diff --git a/cpu/ppc4xx/cpu.c b/cpu/ppc4xx/cpu.c
index 8532d28..095a0aa 100644
--- a/cpu/ppc4xx/cpu.c
+++ b/cpu/ppc4xx/cpu.c
@@ -48,17 +48,24 @@ static int do_chip_reset( unsigned long sys0, unsigned long sys1 );
int checkcpu (void)
{
-#if defined(CONFIG_405GP) || defined(CONFIG_405CR) || defined(CONFIG_IOP480) || defined(CONFIG_440)
+#if defined(CONFIG_405GP) || \
+ defined(CONFIG_405CR) || \
+ defined(CONFIG_IOP480) || \
+ defined(CONFIG_440) || \
+ defined(CONFIG_405EP)
uint pvr = get_pvr();
#endif
-#if defined(CONFIG_405GP) || defined(CONFIG_405CR) || defined(CONFIG_IOP480)
+#if defined(CONFIG_405GP) || \
+ defined(CONFIG_405CR) || \
+ defined(CONFIG_IOP480) || \
+ defined(CONFIG_405EP)
DECLARE_GLOBAL_DATA_PTR;
ulong clock = gd->cpu_clk;
char buf[32];
#endif
-#if defined(CONFIG_405GP) || defined(CONFIG_405CR)
+#if defined(CONFIG_405GP) || defined(CONFIG_405CR) || defined(CONFIG_405EP)
PPC405_SYS_INFO sys_info;
puts ("CPU: ");
@@ -75,6 +82,9 @@ int checkcpu (void)
#if CONFIG_405CR
puts("IBM PowerPC 405CR Rev. ");
#endif
+#if CONFIG_405EP
+ puts("IBM PowerPC 405EP Rev. ");
+#endif
switch (pvr) {
case PVR_405GP_RB:
case PVR_405GPR_RB:
@@ -98,6 +108,7 @@ int checkcpu (void)
putc('A');
break;
case PVR_405CR_RB:
+ case PVR_405EP_RB:
putc('B');
break;
default:
@@ -110,7 +121,7 @@ int checkcpu (void)
sys_info.freqPLB / sys_info.pllOpbDiv / 1000000,
sys_info.freqPLB / sys_info.pllExtBusDiv / 1000000);
-#if CONFIG_405GP
+#if defined(CONFIG_405GP)
if (mfdcr(strap) & PSR_PCI_ASYNC_EN)
printf(" PCI async ext clock used, ");
else
@@ -120,15 +131,27 @@ int checkcpu (void)
printf("internal PCI arbiter enabled\n");
else
printf("external PCI arbiter enabled\n");
+#elif defined(CONFIG_405EP)
+ if (mfdcr(cpc0_boot) & CPC0_BOOT_SEP)
+ printf(" IIC Boot EEPROM enabled\n");
+ else
+ printf(" IIC Boot EEPROM disabled\n");
+ printf(" PCI async ext clock used, ");
+ if (mfdcr(cpc0_pci) & CPC0_PCI_ARBIT_EN)
+ printf("internal PCI arbiter enabled\n");
+ else
+ printf("external PCI arbiter enabled\n");
#endif
+#if defined(CONFIG_405EP)
+ printf(" 16 kB I-Cache 16 kB D-Cache");
+#else
if ((pvr | 0x00000001) == PVR_405GPR_RB) {
printf(" 16 kB I-Cache 16 kB D-Cache");
} else {
printf(" 16 kB I-Cache 8 kB D-Cache");
}
-
-
+#endif
#endif /* defined(CONFIG_405GP) || defined(CONFIG_405CR) */
#ifdef CONFIG_IOP480
@@ -213,7 +236,10 @@ unsigned long get_tbclk (void)
get_sys_info(&sys_info);
return (sys_info.freqProcessor);
-#elif defined(CONFIG_405GP) || defined(CONFIG_405CR) || defined(CONFIG_405)
+#elif defined(CONFIG_405GP) || \
+ defined(CONFIG_405CR) || \
+ defined(CONFIG_405) || \
+ defined(CONFIG_405EP)
PPC405_SYS_INFO sys_info;
diff --git a/cpu/ppc4xx/cpu_init.c b/cpu/ppc4xx/cpu_init.c
index 1d149bc..ac34092 100644
--- a/cpu/ppc4xx/cpu_init.c
+++ b/cpu/ppc4xx/cpu_init.c
@@ -40,6 +40,24 @@
void
cpu_init_f (void)
{
+#if defined(CONFIG_405EP)
+ /*
+ * GPIO0 setup (select GPIO or alternate function)
+ */
+ out32(GPIO0_OSRH, CFG_GPIO0_OSRH); /* output select */
+ out32(GPIO0_OSRL, CFG_GPIO0_OSRL);
+ out32(GPIO0_ISR1H, CFG_GPIO0_ISR1H); /* input select */
+ out32(GPIO0_ISR1L, CFG_GPIO0_ISR1L);
+ out32(GPIO0_TSRH, CFG_GPIO0_TSRH); /* three-state select */
+ out32(GPIO0_TSRL, CFG_GPIO0_TSRL);
+ out32(GPIO0_TCR, CFG_GPIO0_TCR); /* enable output driver for outputs */
+
+ /*
+ * Set EMAC noise filter bits
+ */
+ mtdcr(cpc0_epctl, CPC0_EPRCSR_E0NFE | CPC0_EPRCSR_E1NFE);
+#endif /* CONFIG_405EP */
+
/*
* External Bus Controller (EBC) Setup
*/
@@ -119,12 +137,14 @@ cpu_init_f (void)
*/
int cpu_init_r (void)
{
-#ifdef CONFIG_405GP
+#if defined(CONFIG_405GP) || defined(CONFIG_405EP)
DECLARE_GLOBAL_DATA_PTR;
bd_t *bd = gd->bd;
unsigned long reg;
+#if defined(CONFIG_405GP)
uint pvr = get_pvr();
+#endif
/*
* Write Ethernetaddress into on-chip register
@@ -145,6 +165,7 @@ int cpu_init_r (void)
reg |= bd->bi_enetaddr[5];
out32 (EMAC_IAL, reg);
+#if defined(CONFIG_405GP)
/*
* Set edge conditioning circuitry on PPC405GPr
* for compatibility to existing PPC405GP designs.
@@ -152,7 +173,7 @@ int cpu_init_r (void)
if ((pvr & 0xfffffff0) == (PVR_405GPR_RB & 0xfffffff0)) {
mtdcr(ecr, 0x60606000);
}
-
-#endif /* CONFIG_405GP */
+#endif /* defined(CONFIG_405GP) */
+#endif /* defined(CONFIG_405GP) || defined(CONFIG_405EP) */
return (0);
}
diff --git a/cpu/ppc4xx/miiphy.c b/cpu/ppc4xx/miiphy.c
index 51ba471..c5a90a9 100644
--- a/cpu/ppc4xx/miiphy.c
+++ b/cpu/ppc4xx/miiphy.c
@@ -48,7 +48,7 @@
#include <405_mal.h>
#include <miiphy.h>
-#if defined(CONFIG_405GP) || defined(CONFIG_440)
+#if defined(CONFIG_405GP) || defined(CONFIG_440) || defined(CONFIG_405EP)
/***********************************************************/
diff --git a/cpu/ppc4xx/spd_sdram.c b/cpu/ppc4xx/spd_sdram.c
index 9c1cac5..76aee2e 100644
--- a/cpu/ppc4xx/spd_sdram.c
+++ b/cpu/ppc4xx/spd_sdram.c
@@ -118,9 +118,11 @@ long int spd_sdram(int(read_spd)(uint addr))
int bank_cnt;
int sdram0_pmit=0x07c00000;
+#ifndef CONFIG_405EP /* not on PPC405EP */
int sdram0_besr0=-1;
int sdram0_besr1=-1;
int sdram0_eccesr=-1;
+#endif
int sdram0_ecccfg;
int sdram0_rtr=0;
@@ -153,8 +155,46 @@ long int spd_sdram(int(read_spd)(uint addr))
* Calculate the bus period, we do it this
* way to minimize stack utilization.
*/
+#ifndef CONFIG_405EP
tmp = (mfdcr(pllmd) >> (31-6)) & 0xf; /* get FBDV bits */
tmp = CONFIG_SYS_CLK_FREQ * tmp; /* get plb freq */
+#else
+ {
+ unsigned long freqCPU;
+ unsigned long pllmr0;
+ unsigned long pllmr1;
+ unsigned long pllFbkDiv;
+ unsigned long pllPlbDiv;
+ unsigned long pllmr0_ccdv;
+
+ /*
+ * Read PLL Mode registers
+ */
+ pllmr0 = mfdcr (cpc0_pllmr0);
+ pllmr1 = mfdcr (cpc0_pllmr1);
+
+ pllFbkDiv = ((pllmr1 & PLLMR1_FBMUL_MASK) >> 20);
+ if (pllFbkDiv == 0) {
+ pllFbkDiv = 16;
+ }
+ pllPlbDiv = ((pllmr0 & PLLMR0_CPU_TO_PLB_MASK) >> 16) + 1;
+
+ /*
+ * Determine CPU clock frequency
+ */
+ pllmr0_ccdv = ((pllmr0 & PLLMR0_CPU_DIV_MASK) >> 20) + 1;
+ if (pllmr1 & PLLMR1_SSCS_MASK) {
+ freqCPU = (CONFIG_SYS_CLK_FREQ * pllFbkDiv) / pllmr0_ccdv;
+ } else {
+ freqCPU = CONFIG_SYS_CLK_FREQ / pllmr0_ccdv;
+ }
+
+ /*
+ * Determine PLB clock frequency
+ */
+ tmp = freqCPU / pllPlbDiv;
+ }
+#endif
bus_period = sdram_HZ_to_ns(tmp); /* get sdram speed */
/* Make shure we are using SDRAM */
@@ -414,8 +454,12 @@ long int spd_sdram(int(read_spd)(uint addr))
sdram0_cfg = 0;
mtsdram0( mem_mcopt1, sdram0_cfg );
+#ifndef CONFIG_405EP /* not on PPC405EP */
mtsdram0( mem_besra , sdram0_besr0 );
mtsdram0( mem_besrb , sdram0_besr1 );
+ mtsdram0( mem_ecccf , sdram0_ecccfg );
+ mtsdram0( mem_eccerr, sdram0_eccesr );
+#endif
mtsdram0( mem_rtr , sdram0_rtr );
mtsdram0( mem_pmit , sdram0_pmit );
mtsdram0( mem_mb0cf , sdram0_b0cr );
@@ -423,8 +467,6 @@ long int spd_sdram(int(read_spd)(uint addr))
mtsdram0( mem_mb2cf , sdram0_b2cr );
mtsdram0( mem_mb3cf , sdram0_b3cr );
mtsdram0( mem_sdtr1 , sdram0_tr );
- mtsdram0( mem_ecccf , sdram0_ecccfg );
- mtsdram0( mem_eccerr, sdram0_eccesr );
/* SDRAM have a power on delay, 500 micro should do */
udelay(500);
diff --git a/cpu/ppc4xx/speed.c b/cpu/ppc4xx/speed.c
index f075e3a..fdefbb6 100644
--- a/cpu/ppc4xx/speed.c
+++ b/cpu/ppc4xx/speed.c
@@ -257,11 +257,132 @@ void get_sys_info (sys_info_t * sysInfo) {
}
+#elif defined(CONFIG_405EP)
+void get_sys_info (PPC405_SYS_INFO * sysInfo)
+{
+ unsigned long pllmr0;
+ unsigned long pllmr1;
+ unsigned long sysClkPeriodPs = ONE_BILLION / (CONFIG_SYS_CLK_FREQ / 1000);
+ unsigned long m;
+ unsigned long pllmr0_ccdv;
+
+ /*
+ * Read PLL Mode registers
+ */
+ pllmr0 = mfdcr (cpc0_pllmr0);
+ pllmr1 = mfdcr (cpc0_pllmr1);
+
+ /*
+ * Determine forward divider A
+ */
+ sysInfo->pllFwdDiv = 8 - ((pllmr1 & PLLMR1_FWDVA_MASK) >> 16);
+
+ /*
+ * Determine forward divider B (should be equal to A)
+ */
+ sysInfo->pllFwdDivB = 8 - ((pllmr1 & PLLMR1_FWDVB_MASK) >> 12);
+
+ /*
+ * Determine FBK_DIV.
+ */
+ sysInfo->pllFbkDiv = ((pllmr1 & PLLMR1_FBMUL_MASK) >> 20);
+ if (sysInfo->pllFbkDiv == 0) {
+ sysInfo->pllFbkDiv = 16;
+ }
+
+ /*
+ * Determine PLB_DIV.
+ */
+ sysInfo->pllPlbDiv = ((pllmr0 & PLLMR0_CPU_TO_PLB_MASK) >> 16) + 1;
+
+ /*
+ * Determine PCI_DIV.
+ */
+ sysInfo->pllPciDiv = (pllmr0 & PLLMR0_PCI_TO_PLB_MASK) + 1;
+
+ /*
+ * Determine EXTBUS_DIV.
+ */
+ sysInfo->pllExtBusDiv = ((pllmr0 & PLLMR0_EXB_TO_PLB_MASK) >> 8) + 2;
+
+ /*
+ * Determine OPB_DIV.
+ */
+ sysInfo->pllOpbDiv = ((pllmr0 & PLLMR0_OPB_TO_PLB_MASK) >> 12) + 1;
+
+ /*
+ * Determine the M factor
+ */
+ m = sysInfo->pllFbkDiv * sysInfo->pllFwdDivB;
+
+ /*
+ * Determine VCO clock frequency
+ */
+ sysInfo->freqVCOMhz = (1000000 * m) / sysClkPeriodPs;
+
+ /*
+ * Determine CPU clock frequency
+ */
+ pllmr0_ccdv = ((pllmr0 & PLLMR0_CPU_DIV_MASK) >> 20) + 1;
+ if (pllmr1 & PLLMR1_SSCS_MASK) {
+ sysInfo->freqProcessor = (CONFIG_SYS_CLK_FREQ * sysInfo->pllFbkDiv)
+ / pllmr0_ccdv;
+ } else {
+ sysInfo->freqProcessor = CONFIG_SYS_CLK_FREQ / pllmr0_ccdv;
+ }
+
+ /*
+ * Determine PLB clock frequency
+ */
+ sysInfo->freqPLB = sysInfo->freqProcessor / sysInfo->pllPlbDiv;
+
+ if (!((sysInfo->freqVCOMhz >= VCO_MIN) && (sysInfo->freqVCOMhz <= VCO_MAX))) {
+ printf ("\nInvalid VCO frequency calculated : %ld MHz \a\n",
+ sysInfo->freqVCOMhz);
+ printf ("It must be between %d-%d MHz \a\n", VCO_MIN, VCO_MAX);
+ printf ("PLL Mode reg 0 : %8.8lx\a\n", pllmr0);
+ printf ("PLL Mode reg 1 : %8.8lx\a\n", pllmr1);
+ hang ();
+ }
+}
+
+
+/********************************************
+ * get_OPB_freq
+ * return OPB bus freq in Hz
+ *********************************************/
+ulong get_OPB_freq (void)
+{
+ ulong val = 0;
+
+ PPC405_SYS_INFO sys_info;
+
+ get_sys_info (&sys_info);
+ val = sys_info.freqPLB / sys_info.pllOpbDiv;
+
+ return val;
+}
+
+
+/********************************************
+ * get_PCI_freq
+ * return PCI bus freq in Hz
+ *********************************************/
+ulong get_PCI_freq (void)
+{
+ ulong val;
+ PPC405_SYS_INFO sys_info;
+
+ get_sys_info (&sys_info);
+ val = sys_info.freqPLB / sys_info.pllPciDiv;
+ return val;
+}
+
#endif
int get_clocks (void)
{
-#if defined(CONFIG_405GP) || defined(CONFIG_405CR) || defined(CONFIG_440) || defined(CONFIG_405)
+#if defined(CONFIG_405GP) || defined(CONFIG_405CR) || defined(CONFIG_440) || defined(CONFIG_405) || defined(CONFIG_405EP)
DECLARE_GLOBAL_DATA_PTR;
sys_info_t sys_info;
@@ -290,7 +411,7 @@ ulong get_bus_freq (ulong dummy)
{
ulong val;
-#if defined(CONFIG_405GP) || defined(CONFIG_405CR) || defined(CONFIG_405) || defined(CONFIG_440)
+#if defined(CONFIG_405GP) || defined(CONFIG_405CR) || defined(CONFIG_405) || defined(CONFIG_440) || defined(CONFIG_405EP)
sys_info_t sys_info;
get_sys_info (&sys_info);
diff --git a/cpu/ppc4xx/start.S b/cpu/ppc4xx/start.S
index c334f93..afe8635 100644
--- a/cpu/ppc4xx/start.S
+++ b/cpu/ppc4xx/start.S
@@ -297,7 +297,7 @@ _start_440:
mflr r1
mtspr srr0,r1
rfi
-#endif
+#endif /* CONFIG_440 */
/*
* r3 - 1st arg to board_init(): IMMP pointer
@@ -504,7 +504,7 @@ _start:
#endif /* CONFIG_IOP480 */
/*****************************************************************************/
-#if defined(CONFIG_405GP) || defined(CONFIG_405CR) || defined(CONFIG_405)
+#if defined(CONFIG_405GP) || defined(CONFIG_405CR) || defined(CONFIG_405) || defined(CONFIG_405EP)
/*----------------------------------------------------------------------- */
/* Clear and set up some registers. */
/*----------------------------------------------------------------------- */
@@ -551,6 +551,17 @@ _start:
bl ext_bus_cntlr_init
#endif
+#if defined(CONFIG_405EP)
+ /*----------------------------------------------------------------------- */
+ /* DMA Status, clear to come up clean */
+ /*----------------------------------------------------------------------- */
+ addis r3,r0, 0xFFFF /* Clear all existing DMA status */
+ ori r3,r3, 0xFFFF
+ mtdcr dmasr, r3
+
+ bl ppc405ep_init /* do ppc405ep specific init */
+#endif /* CONFIG_405EP */
+
#if defined(CFG_OCM_DATA_ADDR) && defined(CFG_OCM_DATA_SIZE)
/********************************************************************
* Setup OCM - On Chip Memory
@@ -693,6 +704,7 @@ _start:
#endif /* CONFIG_405GP || CONFIG_405CR */
+/*****************************************************************************/
.globl _start_of_vectors
_start_of_vectors:
@@ -1437,3 +1449,164 @@ trap_reloc:
stw r0, 4(r7)
blr
+
+
+/**************************************************************************/
+/* PPC405EP specific stuff */
+/**************************************************************************/
+#ifdef CONFIG_405EP
+ppc405ep_init:
+ /*
+ !-----------------------------------------------------------------------
+ ! Check FPGA for PCI internal/external arbitration
+ ! If board is set to internal arbitration, update cpc0_pci
+ !-----------------------------------------------------------------------
+ */
+ addi r3,0,CPC0_PCI_HOST_CFG_EN
+#ifdef CONFIG_BUBINGA405EP
+ addis r5,r0,FPGA_REG1@h /* set offset for FPGA_REG1 */
+ ori r5,r5,FPGA_REG1@l
+ lbz r5,0x0(r5) /* read to get PCI arb selection */
+ andi. r6,r5,FPGA_REG1_PCI_INT_ARB /* using internal arbiter ?*/
+ beq ..pci_cfg_set /* if not set, then bypass reg write*/
+#endif
+ ori r3,r3,CPC0_PCI_ARBIT_EN
+..pci_cfg_set:
+ mtdcr CPC0_PCI, r3 /* Enable internal arbiter*/
+
+ /*
+ !-----------------------------------------------------------------------
+ ! Check to see if chip is in bypass mode.
+ ! If so, write stored CPC0_PLLMR0 and CPC0_PLLMR1 values and perform a
+ ! CPU reset Otherwise, skip this step and keep going.
+ ! Note: Running BIOS in bypass mode is not supported since PLB speed
+ ! will not be fast enough for the SDRAM (min 66MHz)
+ !-----------------------------------------------------------------------
+ */
+ mfdcr r5, CPC0_PLLMR1
+ rlwinm r4,r5,1,0x1 /* get system clock source (SSCS) */
+ cmpi cr0,0,r4,0x1
+
+ beq pll_done /* if SSCS =b'1' then PLL has */
+ /* already been set */
+ /* and CPU has been reset */
+ /* so skip to next section */
+
+#ifdef CONFIG_BUBINGA405EP
+ /*
+ !-----------------------------------------------------------------------
+ ! Read NVRAM to get value to write in PLLMR.
+ ! If value has not been correctly saved, write default value
+ ! Default config values (assuming on-board 33MHz SYS_CLK) are above.
+ ! See CPU_DEFAULT_200 and CPU_DEFAULT_266 above.
+ !
+ ! WARNING: This code assumes the first three words in the nvram_t
+ ! structure in openbios.h. Changing the beginning of
+ ! the structure will break this code.
+ !
+ !-----------------------------------------------------------------------
+ */
+ addis r3,0,NVRAM_BASE@h
+ addi r3,r3,NVRAM_BASE@l
+
+ lwz r4, 0(r3)
+ addis r5,0,NVRVFY1@h
+ addi r5,r5,NVRVFY1@l
+ cmp cr0,0,r4,r5 /* Compare 1st NVRAM Magic number*/
+ bne ..no_pllset
+ addi r3,r3,4
+ lwz r4, 0(r3)
+ addis r5,0,NVRVFY2@h
+ addi r5,r5,NVRVFY2@l
+ cmp cr0,0,r4,r5 /* Compare 2 NVRAM Magic number */
+ bne ..no_pllset
+ addi r3,r3,8 /* Skip over conf_size */
+ lwz r4, 4(r3) /* Load PLLMR1 value from NVRAM */
+ lwz r3, 0(r3) /* Load PLLMR0 value from NVRAM */
+ rlwinm r5,r4,1,0x1 /* get system clock source (SSCS) */
+ cmpi cr0,0,r5,1 /* See if PLL is locked */
+ beq pll_write
+..no_pllset:
+#endif /* CONFIG_BUBINGA405EP */
+
+ addis r3,0,PLLMR0_DEFAULT@h /* PLLMR0 default value */
+ ori r3,r3,PLLMR0_DEFAULT@l /* */
+ addis r4,0,PLLMR1_DEFAULT@h /* PLLMR1 default value */
+ ori r4,r4,PLLMR1_DEFAULT@l /* */
+
+ b pll_write /* Write the CPC0_PLLMR with new value */
+
+pll_done:
+ /*
+ !-----------------------------------------------------------------------
+ ! Clear Soft Reset Register
+ ! This is needed to enable PCI if not booting from serial EPROM
+ !-----------------------------------------------------------------------
+ */
+ addi r3, 0, 0x0
+ mtdcr CPC0_SRR, r3
+
+ addis r3,0,0x0010
+ mtctr r3
+pci_wait:
+ bdnz pci_wait
+
+ blr /* return to main code */
+
+/*
+!-----------------------------------------------------------------------------
+! Function: pll_write
+! Description: Updates the value of the CPC0_PLLMR according to CMOS27E documentation
+! That is:
+! 1. Pll is first disabled (de-activated by putting in bypass mode)
+! 2. PLL is reset
+! 3. Clock dividers are set while PLL is held in reset and bypassed
+! 4. PLL Reset is cleared
+! 5. Wait 100us for PLL to lock
+! 6. A core reset is performed
+! Input: r3 = Value to write to CPC0_PLLMR0
+! Input: r4 = Value to write to CPC0_PLLMR1
+! Output r3 = none
+!-----------------------------------------------------------------------------
+*/
+pll_write:
+ mfdcr r5, CPC0_UCR
+ andis. r5,r5,0xFFFF
+ ori r5,r5,0x0101 /* Stop the UART clocks */
+ mtdcr CPC0_UCR,r5 /* Before changing PLL */
+
+ mfdcr r5, CPC0_PLLMR1
+ rlwinm r5,r5,0,0x7FFFFFFF /* Disable PLL */
+ mtdcr CPC0_PLLMR1,r5
+ oris r5,r5,0x4000 /* Set PLL Reset */
+ mtdcr CPC0_PLLMR1,r5
+
+ mtdcr CPC0_PLLMR0,r3 /* Set clock dividers */
+ rlwinm r5,r4,0,0x3FFFFFFF /* Reset & Bypass new PLL dividers */
+ oris r5,r5,0x4000 /* Set PLL Reset */
+ mtdcr CPC0_PLLMR1,r5 /* Set clock dividers */
+ rlwinm r5,r5,0,0xBFFFFFFF /* Clear PLL Reset */
+ mtdcr CPC0_PLLMR1,r5
+
+ /*
+ ! Wait min of 100us for PLL to lock.
+ ! See CMOS 27E databook for more info.
+ ! At 200MHz, that means waiting 20,000 instructions
+ */
+ addi r3,0,20000 /* 2000 = 0x4e20 */
+ mtctr r3
+pll_wait:
+ bdnz pll_wait
+
+ oris r5,r5,0x8000 /* Enable PLL */
+ mtdcr CPC0_PLLMR1,r5 /* Engage */
+
+ /*
+ * Reset CPU to guarantee timings are OK
+ * Not sure if this is needed...
+ */
+ addis r3,0,0x1000
+ mtspr dbcr0,r3 /* This will cause a CPU core reset, and */
+ /* execution will continue from the poweron */
+ /* vector of 0xfffffffc */
+#endif /* CONFIG_405EP */
generated by cgit v1.1 at 2024-11-14 07:05:46 +0000