/*
*
* (c) 2007 Pengutronix, Sascha Hauer <s.hauer@pengutronix.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 <mach/imx-regs.h>
#include <mach/imx-pll.h>
#include <mach/esdctl.h>
#include <asm/cache-l2x0.h>
#define writel(val, reg) \
ldr r0, =reg; \
ldr r1, =val; \
str r1, [r0];
#define writeb(val, reg) \
ldr r0, =reg; \
ldr r1, =val; \
strb r1, [r0];
/* Assuming 24MHz input clock */
#define MPCTL_PARAM_399 (IMX_PLL_PD(0) | IMX_PLL_MFD(15) | IMX_PLL_MFI(8) | IMX_PLL_MFN(5))
#define MPCTL_PARAM_532 ((1 << 31) | IMX_PLL_PD(0) | IMX_PLL_MFD(11) | IMX_PLL_MFI(11) | IMX_PLL_MFN(1))
#define PPCTL_PARAM_300 (IMX_PLL_PD(0) | IMX_PLL_MFD(3) | IMX_PLL_MFI(6) | IMX_PLL_MFN(1))
.section ".text_bare_init","ax"
ARM_PPMRR: .word 0x40000015
L2CACHE_PARAM: .word 0x00030024
CCM_CCMR_W: .word 0x003F4208
CCM_PDR0_W: .word 0x00001000
MPCTL_PARAM_399_W: .word MPCTL_PARAM_399
MPCTL_PARAM_532_W: .word MPCTL_PARAM_532
PPCTL_PARAM_W: .word PPCTL_PARAM_300
CCM_BASE_ADDR_W: .word IMX_CCM_BASE
.globl board_init_lowlevel
board_init_lowlevel:
mov r10, lr
mrc 15, 0, r1, c1, c0, 0
mrc 15, 0, r0, c1, c0, 1
orr r0, r0, #7
mcr 15, 0, r0, c1, c0, 1
orr r1, r1, #(1<<11) /* Flow prediction (Z) */
orr r1, r1, #(1<<22) /* unaligned accesses */
orr r1, r1, #(1<<21) /* Low Int Latency */
mcr 15, 0, r1, c1, c0, 0
mov r0, #0
mcr 15, 0, r0, c15, c2, 4
/*
* Branch predicition is now enabled. Flush the BTAC to ensure a valid
* starting point. Don't flush BTAC while it is disabled to avoid
* ARM1136 erratum 408023.
*/
mov r0, #0
mcr p15, 0, r0, c7, c5, 6 /* flush entire BTAC */
mov r0, #0
mcr 15, 0, r0, c7, c7, 0 /* invalidate I cache and D cache */
mcr 15, 0, r0, c8, c7, 0 /* invalidate TLBs */
mcr 15, 0, r0, c7, c10, 4 /* Drain the write buffer */
/* Also setup the Peripheral Port Remap register inside the core */
ldr r0, ARM_PPMRR /* start from AIPS 2GB region */
mcr p15, 0, r0, c15, c2, 4
/*
* End of ARM1136 init
*/
ldr r0, CCM_BASE_ADDR_W
ldr r2, CCM_CCMR_W
str r2, [r0, #CCM_CCMR]
ldr r3, MPCTL_PARAM_399_W /* consumer path*/
/*Set MPLL , arm clock and ahb clock*/
str r3, [r0, #CCM_MPCTL]
ldr r1, PPCTL_PARAM_W
str r1, [r0, #CCM_PPCTL]
ldr r1, CCM_PDR0_W
str r1, [r0, #CCM_PDR0]
ldr r1, [r0, #CCM_CGR0]
orr r1, r1, #0x00300000
str r1, [r0, #CCM_CGR0]
ldr r1, [r0, #CCM_CGR1]
orr r1, r1, #0x00000C00
orr r1, r1, #0x00000003
str r1, [r0, #CCM_CGR1]
/* Skip SDRAM initialization if we run from RAM */
cmp pc, #0x80000000
bls 1f
cmp pc, #0x90000000
bhi 1f
mov pc, r10
1:
/* Set DDR Type to SDRAM, drive strength workaround *
* 0x00000000 MDDR *
* 0x00000800 3,3V SDRAM */
#define DDRTYPE 0x00000800
ldr r0, =IMX_IOMUXC_BASE + 0x794
ldr r1, =DDRTYPE
str r1, [r0], #4 /* IMX_IOMUXC_BASE + 0x794 */
str r1, [r0], #4 /* IMX_IOMUXC_BASE + 0x798 */
str r1, [r0], #4 /* IMX_IOMUXC_BASE + 0x79c */
str r1, [r0], #4 /* IMX_IOMUXC_BASE + 0x7a0 */
str r1, [r0] /* IMX_IOMUXC_BASE + 0x7a4 */
/* MDDR init, enable mDDR*/
writel(0x00000304, ESDMISC) /* was 0x00000004 */
/* set timing paramters */
writel(0x00255417, ESDCFG0)
/* select Prechare-All mode */
writel(0x92220000, ESDCTL0)
/* Prechare-All */
writel(0x12345678, IMX_SDRAM_CS0 + 0x400)
/* select Load-Mode-Register mode */
writel(0xB8001000, ESDCTL0)
/* Load reg EMR2 */
writeb(0xda, 0x84000000)
/* Load reg EMR3 */
writeb(0xda, 0x86000000)
/* Load reg EMR1 -- enable DLL */
writeb(0xda, 0x82000400)
/* Load reg MR -- reset DLL */
writeb(0xda, 0x80000333)
/* select Prechare-All mode */
writel(0x92220000, ESDCTL0)
/* Prechare-All */
writel(0x12345678, IMX_SDRAM_CS0 + 0x400)
/* select Manual-Refresh mode */
writel(0xA2220000, ESDCTL0)
/* Manual-Refresh 2 times */
writel(0x87654321, IMX_SDRAM_CS0)
writel(0x87654321, IMX_SDRAM_CS0)
/* select Load-Mode-Register mode */
writel(0xB2220000, ESDCTL0)
/* Load reg MR -- CL3, BL8, end DLL reset */
writeb(0xda, 0x80000233)
/* Load reg EMR1 -- OCD default */
writeb(0xda, 0x82000780)
/* Load reg EMR1 -- OCD exit */
writeb(0xda, 0x82000400)
/* select normal-operation mode
* DSIZ32-bit, BL8, COL10-bit, ROW13-bit
* disable PWT & PRCT
* disable Auto-Refresh */
writel(0x82220080, ESDCTL0)
/* enable Auto-Refresh */
writel(0x82228080, ESDCTL0)
/* enable Auto-Refresh */
writel(0x00002000, ESDCTL1)
mov r0, #IMX_L2CC_BASE
ldr r1, [r0, #L2X0_AUX_CTRL]
orr r1, r1, #0x1000
str r1, [r0, #L2X0_AUX_CTRL]
#ifdef CONFIG_NAND_IMX_BOOT
ldr sp, =TEXT_BASE - 4 /* Setup a temporary stack in SDRAM */
ldr r0, =IMX_NFC_BASE /* start of NFC SRAM */
ldr r2, =IMX_NFC_BASE + 0x800 /* end of NFC SRAM */
/* skip NAND boot if not running from NFC space */
cmp pc, r0
blo ret
cmp pc, r2
bhs ret
/* Move ourselves out of NFC SRAM */
ldr r1, =TEXT_BASE
copy_loop:
ldmia r0!, {r3-r9} /* copy from source address [r0] */
stmia r1!, {r3-r9} /* copy to target address [r1] */
cmp r0, r2 /* until source end addreee [r2] */
ble copy_loop
ldr pc, =1f /* Jump to SDRAM */
1:
bl nand_boot /* Load barebox from NAND Flash */
/* rebase the return address */
ldr r1, =IMX_NFC_BASE - TEXT_BASE
sub r10, r10, r1 /* adjust return address from NFC SRAM */
ret:
#endif /* CONFIG_NAND_IMX_BOOT */
mov pc, r10
