mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-17 02:08:38 +00:00
9973e3c614
This patch changes the return type of initdram() from long int to phys_size_t. This is required for a couple of reasons: long int limits the amount of dram to 2GB, and u-boot in general is moving over to phys_size_t to represent the size of physical memory. phys_size_t is defined as an unsigned long on almost all current platforms. This patch *only* changes the return type of the initdram function (in include/common.h, as well as in each board's implementation of initdram). It does not actually modify the code inside the function on any of the platforms; platforms which wish to support more than 2GB of DRAM will need to modify their initdram() function code. Build tested with MAKEALL for ppc, arm, mips, mips-el. Booted on powerpc MPC8641HPCN. Signed-off-by: Becky Bruce <becky.bruce@freescale.com>
92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
/*
|
||
* (C) Copyright 2007
|
||
* Stefan Roese, DENX Software Engineering, sr@denx.de.
|
||
*
|
||
* See file CREDITS for list of people who contributed to this
|
||
* project.
|
||
*
|
||
* 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.
|
||
*
|
||
* This program is distributed in the hope that it will be useful,
|
||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
* GNU General Public License for more details.
|
||
*
|
||
* You should have received a copy of the GNU General Public License
|
||
* along with this program; if not, write to the Free Software
|
||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
||
* MA 02111-1307 USA
|
||
*/
|
||
|
||
#include <common.h>
|
||
#include <ppc4xx.h>
|
||
#include <asm/processor.h>
|
||
#include <asm/io.h>
|
||
|
||
static void wait_init_complete(void)
|
||
{
|
||
u32 val;
|
||
|
||
do {
|
||
mfsdram(mem_mcsts, val);
|
||
} while (!(val & 0x80000000));
|
||
}
|
||
|
||
/*
|
||
* phys_size_t initdram(int board_type)
|
||
*
|
||
* As the name already indicates, this function is called very early
|
||
* from start.S and configures the SDRAM with fixed values. This is needed,
|
||
* since the 440EP has no internal SRAM and the 4kB NAND_SPL loader has
|
||
* not enough free space to implement the complete I2C SPD DDR autodetection
|
||
* routines. Therefore the Bamboo only supports the onboard 64MBytes of SDRAM
|
||
* when booting from NAND flash.
|
||
*
|
||
* Note:
|
||
* As found out by Eugene O'Brien <eugene.obrien@advantechamt.com>, the fixed
|
||
* DDR setup has problems (U-Boot crashes randomly upon TFTP), when the DIMM
|
||
* modules are still plugged in. So it is recommended to remove the DIMM
|
||
* modules while using the NAND booting code with the fixed SDRAM setup!
|
||
*/
|
||
phys_size_t initdram(int board_type)
|
||
{
|
||
/*
|
||
* Soft-reset SDRAM controller.
|
||
*/
|
||
mtsdr(sdr_srst, SDR0_SRST_DMC);
|
||
mtsdr(sdr_srst, 0x00000000);
|
||
|
||
/*
|
||
* Disable memory controller.
|
||
*/
|
||
mtsdram(mem_cfg0, 0x00000000);
|
||
|
||
/*
|
||
* Setup some default
|
||
*/
|
||
mtsdram(mem_uabba, 0x00000000); /* ubba=0 (default) */
|
||
mtsdram(mem_slio, 0x00000000); /* rdre=0 wrre=0 rarw=0 */
|
||
mtsdram(mem_devopt, 0x00000000); /* dll=0 ds=0 (normal) */
|
||
mtsdram(mem_wddctr, 0x00000000); /* wrcp=0 dcd=0 */
|
||
mtsdram(mem_clktr, 0x40000000); /* clkp=1 (90 deg wr) dcdt=0 */
|
||
|
||
/*
|
||
* Following for CAS Latency = 2.5 @ 133 MHz PLB
|
||
*/
|
||
mtsdram(mem_b0cr, 0x00082001);
|
||
mtsdram(mem_tr0, 0x41094012);
|
||
mtsdram(mem_tr1, 0x8080083d); /* SS=T2 SL=STAGE 3 CD=1 CT=0x00*/
|
||
mtsdram(mem_rtr, 0x04100000); /* Interval 7.8<EFBFBD>s @ 133MHz PLB */
|
||
mtsdram(mem_cfg1, 0x00000000); /* Self-refresh exit, disable PM*/
|
||
|
||
/*
|
||
* Enable the controller, then wait for DCEN to complete
|
||
*/
|
||
mtsdram(mem_cfg0, 0x80000000); /* DCEN=1, PMUD=0*/
|
||
wait_init_complete();
|
||
|
||
return CFG_MBYTES_SDRAM << 20;
|
||
}
|