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* Implement adaptive SDRAM timing configuration based on actual CPU

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clock frequency for INCA-IP; fix problem with board hanging when
  switching from 150MHz to 100MHz

* Add PCMCIA CS support for BMS2003 board
This commit is contained in:
wdenk 2004-01-29 09:22:58 +00:00
parent c178d3da6f
commit 6876609446
6 changed files with 131 additions and 48 deletions
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6
CHANGELOG
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@ -2,6 +2,12 @@
Changes since U-Boot 1.0.1:
======================================================================
* Implement adaptive SDRAM timing configuration based on actual CPU
clock frequency for INCA-IP; fix problem with board hanging when
switching from 150MHz to 100MHz
* Add PCMCIA CS support for BMS2003 board
* Add variable CPU clock for MPC859/866 systems (so far only TQM866M):
see doc/README.MPC866 for details;
implement workaround for "SIU4" and "SIU9" silicon bugs on MPC866;

141
board/incaip/memsetup.S
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@ -174,63 +174,120 @@ cgu_init:
.end cgu_init
/*
* void sdram_init(long)
*
* a0 has the clock value
*/
.globl sdram_init
.ent sdram_init
sdram_init:
li t1, MC_MODUL_BASE
/* Disable memory controller before changing any of its registers */
sw zero, MC_CTRLENA(t1)
li t2, 100000000
beq a0, t2, 1f
nop
li t2, 133000000
beq a0, t2, 2f
nop
li t2, 150000000
beq a0, t2, 3f
nop
b 5f
nop
/* 100 MHz clock */
1:
/* Set clock ratio (clkrat=1:1, rddel=3) */
li t2, 0x00000003
sw t2, MC_IOGP(t1)
/* Set sdram refresh rate (4K/64ms @ 100MHz) */
li t2, 0x0000061A
b 4f
sw t2, MC_TREFRESH(t1)
/* 133 MHz clock */
2:
/* Set clock ratio (clkrat=1:1, rddel=3) */
li t2, 0x00000003
sw t2, MC_IOGP(t1)
/* Set sdram refresh rate (4K/64ms @ 133MHz) */
li t2, 0x00000822
b 4f
sw t2, MC_TREFRESH(t1)
/* 150 MHz clock */
3:
/* Set clock ratio (clkrat=3:2, rddel=4) */
li t2, 0x00000014
sw t2, MC_IOGP(t1)
/* Set sdram refresh rate (4K/64ms @ 150MHz) */
li t2, 0x00000927
sw t2, MC_TREFRESH(t1)
4:
/* Clear Error log registers */
sw zero, MC_ERRCAUSE(t1)
sw zero, MC_ERRADDR(t1)
/* Clear Power-down registers */
sw zero, MC_SELFRFSH(t1)
/* Set CAS Latency */
li t2, 0x00000020 /* CL = 2 */
sw t2, MC_MRSCODE(t1)
/* Set word width to 16 bit */
li t2, 0x2
sw t2, MC_CFGDW(t1)
/* Set CS0 to SDRAM parameters */
li t2, 0x000014C9
sw t2, MC_CFGPB0(t1)
/* Set SDRAM latency parameters */
li t2, 0x00026325 /* BC PC100 */
sw t2, MC_LATENCY(t1)
5:
/* Finally enable the controller */
li t2, 0x00000001
sw t2, MC_CTRLENA(t1)
j ra
nop
.end sdram_init
.globl memsetup
.ent memsetup
memsetup:
/* EBU and CGU Initialization.
/* EBU, CGU and SDRAM Initialization.
*/
li a0, CPU_CLOCK_RATE
move t0, ra
/* We rely on the fact that neither ebu_init() nor cgu_init()
/* We rely on the fact that neither ebu_init() nor cgu_init() nor sdram_init()
* modify t0 and a0.
*/
bal cgu_init
nop
bal ebu_init
nop
bal cgu_init
bal sdram_init
nop
move ra, t0
/* SDRAM Initialization.
*/
li t0, MC_MODUL_BASE
/* Clear Error log registers */
sw zero, MC_ERRCAUSE(t0)
sw zero, MC_ERRADDR(t0)
/* Set clock ratio to 1:1 */
li t1, 0x03 /* clkrat=1:1, rddel=3 */
sw t1, MC_IOGP(t0)
/* Clear Power-down registers */
sw zero, MC_SELFRFSH(t0)
/* Set CAS Latency */
li t1, 0x00000020 /* CL = 2 */
sw t1, MC_MRSCODE(t0)
/* Set word width to 16 bit */
li t1, 0x2
sw t1, MC_CFGDW(t0)
/* Set CS0 to SDRAM parameters */
li t1, 0x000014C9
sw t1, MC_CFGPB0(t0)
/* Set SDRAM latency parameters */
li t1, 0x00026325 /* BC PC100 */
sw t1, MC_LATENCY(t0)
/* Set SDRAM refresh rate */
li t1, 0x00000C30 /* 4K/64ms @ 100MHz */
sw t1, MC_TREFRESH(t0)
/* Finally enable the controller */
li t1, 1
sw t1, MC_CTRLENA(t0)
j ra
nop
.end memsetup

4
cpu/mips/incaip_clock.c
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@ -101,13 +101,15 @@ int incaip_set_cpuclk (void)
{
extern void ebu_init(long);
extern void cgu_init(long);
extern void sdram_init(long);
uchar tmp[64];
ulong cpuclk;
if (getenv_r ("cpuclk", tmp, sizeof (tmp)) > 0) {
cpuclk = simple_strtoul (tmp, NULL, 10) * 1000000;
ebu_init (cpuclk);
cgu_init (cpuclk);
ebu_init (cpuclk);
sdram_init (cpuclk);
}
return 0;

19
doc/README.MPC866 Normal file
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@ -0,0 +1,19 @@
The current implementation allows the user to specify the desired CPU
clock value, in MHz, via an environment variable "cpuclk".
Three compile-time constants are used:
CFG_866_OSCCLK - input quartz clock
CFG_866_CPUCLK_MIN - minimum allowed CPU clock
CFG_866_CPUCLK_MAX - maximum allowed CPU clock
CFG_866_CPUCLK_DEFAULT - default CPU clock value
If the "cpuclk" environment variable value is within the CPUCLK_MIN /
CPUCLK_MAX limits, the specified value is used. Otherwise, the
default CPU clock value is set.
Please note that for now the new clock-handling code has been enabled
for the TQM866M board only, even though it should be pretty much
common for other MPC859 / MPC866 based boards also. Our intention
here was to move in small steps and not to break the existing code
for other boards.

8
include/configs/TQM866M.h
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@ -36,16 +36,14 @@
#define CONFIG_MPC866 1 /* This is a MPC866 CPU */
#define CONFIG_TQM866M 1 /* ...on a TQM8xxM module */
#define CFG_866_OSCCLK 10000000 /* 10 MHz - PLL input clock */
#define CFG_866_CPUCLK_MIN 40000000 /* 40 MHz - CPU minimum clock */
#define CFG_866_OSCCLK 10000000 /* 10 MHz - PLL input clock */
#define CFG_866_CPUCLK_MIN 10000000 /* 10 MHz - CPU minimum clock */
#define CFG_866_CPUCLK_MAX 133000000 /* 133 MHz - CPU maximum clock */
#define CFG_866_CPUCLK_DEFAULT 100000000 /* 100 MHz - CPU default clock */
#define CFG_866_CPUCLK_DEFAULT 50000000 /* 50 MHz - CPU default clock */
/* (it will be used if there is no */
/* 'cpuclk' variable with valid value) */
#define CONFIG_8xx_CONS_SMC1 1 /* Console is on SMC1 */
#undef CONFIG_8xx_CONS_SMC2
#undef CONFIG_8xx_CONS_NONE
#define CONFIG_BAUDRATE 115200 /* console baudrate = 115kbps */

1
include/configs/bms2003.h
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@ -346,6 +346,7 @@
#define CFG_PCMCIA_ATTRB_SIZE ( 64 << 20 )
#define CFG_PCMCIA_IO_ADDR (0xEC100000)
#define CFG_PCMCIA_IO_SIZE ( 64 << 20 )
#define PCMCIA_MEM_WIN_NO 5
#define NSCU_OE_INV 1 /* PCMCIA_GCRX_CXOE is inverted */
#endif