+++ /dev/null
-/*
- * Most of this taken from Redboot hal_platform_setup.h with cleanup
- *
- * NOTE: I haven't clean this up considerably, just enough to get it
- * running. See hal_platform_setup.h for the source. See
- * board/cradle/lowlevel_init.S for another PXA250 setup that is
- * much cleaner.
- *
- * 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 <config.h>
-#include <version.h>
-#include <asm/arch/pxa-regs.h>
-
-DRAM_SIZE: .long CONFIG_SYS_DRAM_SIZE
-
-/* wait for coprocessor write complete */
- .macro CPWAIT reg
- mrc p15,0,\reg,c2,c0,0
- mov \reg,\reg
- sub pc,pc,#4
- .endm
-
-
-/*
- * Memory setup
- */
-
-.globl lowlevel_init
-lowlevel_init:
-
- mov r10, lr
-
- /* Set up GPIO pins first ----------------------------------------- */
-
- ldr r0, =GPSR0
- ldr r1, =CONFIG_SYS_GPSR0_VAL
- str r1, [r0]
-
- ldr r0, =GPSR1
- ldr r1, =CONFIG_SYS_GPSR1_VAL
- str r1, [r0]
-
- ldr r0, =GPSR2
- ldr r1, =CONFIG_SYS_GPSR2_VAL
- str r1, [r0]
-
- ldr r0, =GPCR0
- ldr r1, =CONFIG_SYS_GPCR0_VAL
- str r1, [r0]
-
- ldr r0, =GPCR1
- ldr r1, =CONFIG_SYS_GPCR1_VAL
- str r1, [r0]
-
- ldr r0, =GPCR2
- ldr r1, =CONFIG_SYS_GPCR2_VAL
- str r1, [r0]
-
- ldr r0, =GPDR0
- ldr r1, =CONFIG_SYS_GPDR0_VAL
- str r1, [r0]
-
- ldr r0, =GPDR1
- ldr r1, =CONFIG_SYS_GPDR1_VAL
- str r1, [r0]
-
- ldr r0, =GPDR2
- ldr r1, =CONFIG_SYS_GPDR2_VAL
- str r1, [r0]
-
- ldr r0, =GAFR0_L
- ldr r1, =CONFIG_SYS_GAFR0_L_VAL
- str r1, [r0]
-
- ldr r0, =GAFR0_U
- ldr r1, =CONFIG_SYS_GAFR0_U_VAL
- str r1, [r0]
-
- ldr r0, =GAFR1_L
- ldr r1, =CONFIG_SYS_GAFR1_L_VAL
- str r1, [r0]
-
- ldr r0, =GAFR1_U
- ldr r1, =CONFIG_SYS_GAFR1_U_VAL
- str r1, [r0]
-
- ldr r0, =GAFR2_L
- ldr r1, =CONFIG_SYS_GAFR2_L_VAL
- str r1, [r0]
-
- ldr r0, =GAFR2_U
- ldr r1, =CONFIG_SYS_GAFR2_U_VAL
- str r1, [r0]
-
- ldr r0, =PSSR /* enable GPIO pins */
- ldr r1, =CONFIG_SYS_PSSR_VAL
- str r1, [r0]
-
- /* ---------------------------------------------------------------- */
- /* Enable memory interface */
- /* */
- /* The sequence below is based on the recommended init steps */
- /* detailed in the Intel PXA250 Operating Systems Developers Guide, */
- /* Chapter 10. */
- /* ---------------------------------------------------------------- */
-
- /* ---------------------------------------------------------------- */
- /* Step 1: Wait for at least 200 microsedonds to allow internal */
- /* clocks to settle. Only necessary after hard reset... */
- /* FIXME: can be optimized later */
- /* ---------------------------------------------------------------- */
-
- ldr r3, =OSCR /* reset the OS Timer Count to zero */
- mov r2, #0
- str r2, [r3]
- ldr r4, =0x300 /* really 0x2E1 is about 200usec, */
- /* so 0x300 should be plenty */
-1:
- ldr r2, [r3]
- cmp r4, r2
- bgt 1b
-
-mem_init:
-
- ldr r1, =MEMC_BASE /* get memory controller base addr. */
-
- /* ---------------------------------------------------------------- */
- /* Step 2a: Initialize Asynchronous static memory controller */
- /* ---------------------------------------------------------------- */
-
- /* MSC registers: timing, bus width, mem type */
-
- /* MSC0: nCS(0,1) */
- ldr r2, =CONFIG_SYS_MSC0_VAL
- str r2, [r1, #MSC0_OFFSET]
- ldr r2, [r1, #MSC0_OFFSET] /* read back to ensure */
- /* that data latches */
- /* MSC1: nCS(2,3) */
- ldr r2, =CONFIG_SYS_MSC1_VAL
- str r2, [r1, #MSC1_OFFSET]
- ldr r2, [r1, #MSC1_OFFSET]
-
- /* MSC2: nCS(4,5) */
- ldr r2, =CONFIG_SYS_MSC2_VAL
- str r2, [r1, #MSC2_OFFSET]
- ldr r2, [r1, #MSC2_OFFSET]
-
- /* ---------------------------------------------------------------- */
- /* Step 2b: Initialize Card Interface */
- /* ---------------------------------------------------------------- */
-
- /* MECR: Memory Expansion Card Register */
- ldr r2, =CONFIG_SYS_MECR_VAL
- str r2, [r1, #MECR_OFFSET]
- ldr r2, [r1, #MECR_OFFSET]
-
- /* MCMEM0: Card Interface slot 0 timing */
- ldr r2, =CONFIG_SYS_MCMEM0_VAL
- str r2, [r1, #MCMEM0_OFFSET]
- ldr r2, [r1, #MCMEM0_OFFSET]
-
- /* MCMEM1: Card Interface slot 1 timing */
- ldr r2, =CONFIG_SYS_MCMEM1_VAL
- str r2, [r1, #MCMEM1_OFFSET]
- ldr r2, [r1, #MCMEM1_OFFSET]
-
- /* MCATT0: Card Interface Attribute Space Timing, slot 0 */
- ldr r2, =CONFIG_SYS_MCATT0_VAL
- str r2, [r1, #MCATT0_OFFSET]
- ldr r2, [r1, #MCATT0_OFFSET]
-
- /* MCATT1: Card Interface Attribute Space Timing, slot 1 */
- ldr r2, =CONFIG_SYS_MCATT1_VAL
- str r2, [r1, #MCATT1_OFFSET]
- ldr r2, [r1, #MCATT1_OFFSET]
-
- /* MCIO0: Card Interface I/O Space Timing, slot 0 */
- ldr r2, =CONFIG_SYS_MCIO0_VAL
- str r2, [r1, #MCIO0_OFFSET]
- ldr r2, [r1, #MCIO0_OFFSET]
-
- /* MCIO1: Card Interface I/O Space Timing, slot 1 */
- ldr r2, =CONFIG_SYS_MCIO1_VAL
- str r2, [r1, #MCIO1_OFFSET]
- ldr r2, [r1, #MCIO1_OFFSET]
-
- /* ---------------------------------------------------------------- */
- /* Step 2c: Write FLYCNFG FIXME: what's that??? */
- /* ---------------------------------------------------------------- */
-
-
- /* ---------------------------------------------------------------- */
- /* Step 2d: Initialize Timing for Sync Memory (SDCLK0) */
- /* ---------------------------------------------------------------- */
-
- /* Before accessing MDREFR we need a valid DRI field, so we set */
- /* this to power on defaults + DRI field. */
-
- ldr r3, =CONFIG_SYS_MDREFR_VAL
- ldr r2, =0xFFF
- and r3, r3, r2
- ldr r4, =0x03ca4000
- orr r4, r4, r3
- str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
- ldr r4, [r1, #MDREFR_OFFSET]
-
- /* Note: preserve the mdrefr value in r4 */
-
-
- /* ---------------------------------------------------------------- */
- /* Step 3: Initialize Synchronous Static Memory (Flash/Peripherals) */
- /* ---------------------------------------------------------------- */
-
- /* Initialize SXCNFG register. Assert the enable bits */
-
- /* Write SXMRS to cause an MRS command to all enabled banks of */
- /* synchronous static memory. Note that SXLCR need not be written */
- /* at this time. */
-
- /* FIXME: we use async mode for now */
-
-
- /* ---------------------------------------------------------------- */
- /* Step 4: Initialize SDRAM */
- /* ---------------------------------------------------------------- */
-
- /* set MDREFR according to user define with exception of a few bits */
-
- ldr r4, =CONFIG_SYS_MDREFR_VAL
- orr r4, r4, #(MDREFR_SLFRSH)
- bic r4, r4, #(MDREFR_E1PIN|MDREFR_E0PIN)
- str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
- ldr r4, [r1, #MDREFR_OFFSET]
-
- /* Step 4b: de-assert MDREFR:SLFRSH. */
-
- bic r4, r4, #(MDREFR_SLFRSH)
- str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
- ldr r4, [r1, #MDREFR_OFFSET]
-
-
- /* Step 4c: assert MDREFR:E1PIN and E0PIO as desired */
-
- ldr r4, =CONFIG_SYS_MDREFR_VAL
- str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
- ldr r4, [r1, #MDREFR_OFFSET]
-
-
- /* Step 4d: write MDCNFG with MDCNFG:DEx deasserted (set to 0), to */
- /* configure but not enable each SDRAM partition pair. */
-
- ldr r4, =CONFIG_SYS_MDCNFG_VAL
- bic r4, r4, #(MDCNFG_DE0|MDCNFG_DE1)
-
- str r4, [r1, #MDCNFG_OFFSET] /* write back MDCNFG */
- ldr r4, [r1, #MDCNFG_OFFSET]
-
-
- /* Step 4e: Wait for the clock to the SDRAMs to stabilize, */
- /* 100..200 µsec. */
-
- ldr r3, =OSCR /* reset the OS Timer Count to zero */
- mov r2, #0
- str r2, [r3]
- ldr r4, =0x300 /* really 0x2E1 is about 200usec, */
- /* so 0x300 should be plenty */
-1:
- ldr r2, [r3]
- cmp r4, r2
- bgt 1b
-
-
- /* Step 4f: Trigger a number (usually 8) refresh cycles by */
- /* attempting non-burst read or write accesses to disabled */
- /* SDRAM, as commonly specified in the power up sequence */
- /* documented in SDRAM data sheets. The address(es) used */
- /* for this purpose must not be cacheable. */
-
- ldr r3, =CONFIG_SYS_DRAM_BASE
- str r2, [r3]
- str r2, [r3]
- str r2, [r3]
- str r2, [r3]
- str r2, [r3]
- str r2, [r3]
- str r2, [r3]
- str r2, [r3]
-
-
- /* Step 4g: Write MDCNFG with enable bits asserted */
- /* (MDCNFG:DEx set to 1). */
-
- ldr r3, [r1, #MDCNFG_OFFSET]
- orr r3, r3, #(MDCNFG_DE0|MDCNFG_DE1)
- str r3, [r1, #MDCNFG_OFFSET]
-
- /* Step 4h: Write MDMRS. */
-
- ldr r2, =CONFIG_SYS_MDMRS_VAL
- str r2, [r1, #MDMRS_OFFSET]
-
-
- /* We are finished with Intel's memory controller initialisation */
-
-
- /* ---------------------------------------------------------------- */
- /* Disable (mask) all interrupts at interrupt controller */
- /* ---------------------------------------------------------------- */
-
-initirqs:
-
- mov r1, #0 /* clear int. level register (IRQ, not FIQ) */
- ldr r2, =ICLR
- str r1, [r2]
-
- ldr r2, =ICMR /* mask all interrupts at the controller */
- str r1, [r2]
-
-
- /* ---------------------------------------------------------------- */
- /* Clock initialisation */
- /* ---------------------------------------------------------------- */
-
-initclks:
-
- /* Disable the peripheral clocks, and set the core clock frequency */
- /* (hard-coding at 398.12MHz for now). */
-
- /* Turn Off ALL on-chip peripheral clocks for re-configuration */
- /* Note: See label 'ENABLECLKS' for the re-enabling */
- ldr r1, =CKEN
- mov r2, #0
- str r2, [r1]
-
-
- /* default value in case no valid rotary switch setting is found */
- ldr r2, =(CCCR_L27|CCCR_M2|CCCR_N10) /* DEFAULT: {200/200/100} */
-
- /* ... and write the core clock config register */
- ldr r1, =CCCR
- str r2, [r1]
-
-#ifdef RTC
- /* enable the 32Khz oscillator for RTC and PowerManager */
-
- ldr r1, =OSCC
- mov r2, #OSCC_OON
- str r2, [r1]
-
- /* NOTE: spin here until OSCC.OOK get set, meaning the PLL */
- /* has settled. */
-60:
- ldr r2, [r1]
- ands r2, r2, #1
- beq 60b
-#endif
-
- /* ---------------------------------------------------------------- */
- /* */
- /* ---------------------------------------------------------------- */
-
- /* Save SDRAM size */
- ldr r1, =DRAM_SIZE
- str r8, [r1]
-
- /* Interrupt init: Mask all interrupts */
- ldr r0, =ICMR /* enable no sources */
- mov r1, #0
- str r1, [r0]
-
- /* FIXME */
-
-#define NODEBUG
-#ifdef NODEBUG
- /*Disable software and data breakpoints */
- mov r0,#0
- mcr p15,0,r0,c14,c8,0 /* ibcr0 */
- mcr p15,0,r0,c14,c9,0 /* ibcr1 */
- mcr p15,0,r0,c14,c4,0 /* dbcon */
-
- /*Enable all debug functionality */
- mov r0,#0x80000000
- mcr p14,0,r0,c10,c0,0 /* dcsr */
-
-#endif
-
- /* ---------------------------------------------------------------- */
- /* End lowlevel_init */
- /* ---------------------------------------------------------------- */
-
-endlowlevel_init:
-
- mov pc, lr
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