| /* | |
| * 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 CFG_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 | |
| _TEXT_BASE: | |
| .word TEXT_BASE | |
| /* | |
| * Memory setup | |
| */ | |
| .globl lowlevel_init | |
| lowlevel_init: | |
| mov r10, lr | |
| /* Set up GPIO pins first ----------------------------------------- */ | |
| ldr r0, =GPSR0 | |
| ldr r1, =CFG_GPSR0_VAL | |
| str r1, [r0] | |
| ldr r0, =GPSR1 | |
| ldr r1, =CFG_GPSR1_VAL | |
| str r1, [r0] | |
| ldr r0, =GPSR2 | |
| ldr r1, =CFG_GPSR2_VAL | |
| str r1, [r0] | |
| ldr r0, =GPCR0 | |
| ldr r1, =CFG_GPCR0_VAL | |
| str r1, [r0] | |
| ldr r0, =GPCR1 | |
| ldr r1, =CFG_GPCR1_VAL | |
| str r1, [r0] | |
| ldr r0, =GPCR2 | |
| ldr r1, =CFG_GPCR2_VAL | |
| str r1, [r0] | |
| ldr r0, =GPDR0 | |
| ldr r1, =CFG_GPDR0_VAL | |
| str r1, [r0] | |
| ldr r0, =GPDR1 | |
| ldr r1, =CFG_GPDR1_VAL | |
| str r1, [r0] | |
| ldr r0, =GPDR2 | |
| ldr r1, =CFG_GPDR2_VAL | |
| str r1, [r0] | |
| ldr r0, =GAFR0_L | |
| ldr r1, =CFG_GAFR0_L_VAL | |
| str r1, [r0] | |
| ldr r0, =GAFR0_U | |
| ldr r1, =CFG_GAFR0_U_VAL | |
| str r1, [r0] | |
| ldr r0, =GAFR1_L | |
| ldr r1, =CFG_GAFR1_L_VAL | |
| str r1, [r0] | |
| ldr r0, =GAFR1_U | |
| ldr r1, =CFG_GAFR1_U_VAL | |
| str r1, [r0] | |
| ldr r0, =GAFR2_L | |
| ldr r1, =CFG_GAFR2_L_VAL | |
| str r1, [r0] | |
| ldr r0, =GAFR2_U | |
| ldr r1, =CFG_GAFR2_U_VAL | |
| str r1, [r0] | |
| ldr r0, =PSSR /* enable GPIO pins */ | |
| ldr r1, =CFG_PSSR_VAL | |
| str r1, [r0] | |
| /* ldr r3, =MSC1 / low - bank 2 Lubbock Registers / SRAM */ | |
| /* ldr r2, =CFG_MSC1_VAL / high - bank 3 Ethernet Controller */ | |
| /* str r2, [r3] / need to set MSC1 before trying to write to the HEX LEDs */ | |
| /* ldr r2, [r3] / need to read it back to make sure the value latches (see MSC section of manual) */ | |
| /* */ | |
| /* ldr r1, =LED_BLANK */ | |
| /* mov r0, #0xFF */ | |
| /* str r0, [r1] / turn on hex leds */ | |
| /* */ | |
| /*loop: */ | |
| /* */ | |
| /* ldr r0, =0xB0070001 */ | |
| /* ldr r1, =_LED */ | |
| /* str r0, [r1] / hex display */ | |
| /* ---------------------------------------------------------------- */ | |
| /* 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, =CFG_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, =CFG_MSC1_VAL | |
| str r2, [r1, #MSC1_OFFSET] | |
| ldr r2, [r1, #MSC1_OFFSET] | |
| /* MSC2: nCS(4,5) */ | |
| ldr r2, =CFG_MSC2_VAL | |
| str r2, [r1, #MSC2_OFFSET] | |
| ldr r2, [r1, #MSC2_OFFSET] | |
| /* ---------------------------------------------------------------- */ | |
| /* Step 2b: Initialize Card Interface */ | |
| /* ---------------------------------------------------------------- */ | |
| /* MECR: Memory Expansion Card Register */ | |
| ldr r2, =CFG_MECR_VAL | |
| str r2, [r1, #MECR_OFFSET] | |
| ldr r2, [r1, #MECR_OFFSET] | |
| /* MCMEM0: Card Interface slot 0 timing */ | |
| ldr r2, =CFG_MCMEM0_VAL | |
| str r2, [r1, #MCMEM0_OFFSET] | |
| ldr r2, [r1, #MCMEM0_OFFSET] | |
| /* MCMEM1: Card Interface slot 1 timing */ | |
| ldr r2, =CFG_MCMEM1_VAL | |
| str r2, [r1, #MCMEM1_OFFSET] | |
| ldr r2, [r1, #MCMEM1_OFFSET] | |
| /* MCATT0: Card Interface Attribute Space Timing, slot 0 */ | |
| ldr r2, =CFG_MCATT0_VAL | |
| str r2, [r1, #MCATT0_OFFSET] | |
| ldr r2, [r1, #MCATT0_OFFSET] | |
| /* MCATT1: Card Interface Attribute Space Timing, slot 1 */ | |
| ldr r2, =CFG_MCATT1_VAL | |
| str r2, [r1, #MCATT1_OFFSET] | |
| ldr r2, [r1, #MCATT1_OFFSET] | |
| /* MCIO0: Card Interface I/O Space Timing, slot 0 */ | |
| ldr r2, =CFG_MCIO0_VAL | |
| str r2, [r1, #MCIO0_OFFSET] | |
| ldr r2, [r1, #MCIO0_OFFSET] | |
| /* MCIO1: Card Interface I/O Space Timing, slot 1 */ | |
| ldr r2, =CFG_MCIO1_VAL | |
| str r2, [r1, #MCIO1_OFFSET] | |
| ldr r2, [r1, #MCIO1_OFFSET] | |
| /* ---------------------------------------------------------------- */ | |
| /* Step 2c: Write FLYCNFG FIXME: what's that??? */ | |
| /* ---------------------------------------------------------------- */ | |
| /* test if we run from flash or RAM - RAM/BDI: don't setup RAM */ | |
| adr r3, mem_init /* r0 <- current position of code */ | |
| ldr r2, =mem_init | |
| cmp r3, r2 /* skip init if in place */ | |
| beq initirqs | |
| /* ---------------------------------------------------------------- */ | |
| /* 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, =CFG_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] | |
| /* ---------------------------------------------------------------- */ | |
| /* 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 */ | |
| /* ---------------------------------------------------------------- */ | |
| /* Step 4a: assert MDREFR:K?RUN and configure */ | |
| /* MDREFR:K1DB2 and MDREFR:K2DB2 as desired. */ | |
| ldr r4, =CFG_MDREFR_VAL | |
| 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 */ | |
| orr r4, r4, #(MDREFR_E1PIN|MDREFR_E0PIN) | |
| 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, =CFG_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. */ | |
| /* There should 9 writes, since the first write doesn't */ | |
| /* trigger a refresh cycle on PXA250. See Intel PXA250 and */ | |
| /* PXA210 Processors Specification Update, */ | |
| /* Jan 2003, Errata #116, page 30. */ | |
| ldr r3, =CFG_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] | |
| 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, =CFG_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] | |
| /* 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 | |
| /* ---------------------------------------------------------------- */ | |
| /* */ | |
| /* ---------------------------------------------------------------- */ | |
| /* 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 */ | |
| #ifndef DEBUG | |
| /*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 |