/* * 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 .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 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) */ /* ---------------------------------------------------------------- */ @ get the mdrefr settings ldr r4,=CONFIG_SYS_MDREFR_VAL @ write back mdrefr str r4,[r1, #MDREFR_OFFSET] 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 */ /* ---------------------------------------------------------------- */ @ set K1RUN for bank 0 @ orr r4, r4, #MDREFR_K1RUN @ write back mdrefr @ str r4, [r1, #MDREFR_OFFSET] ldr r4, [r1, #MDREFR_OFFSET] @ deassert SLFRSH @ bic r4, r4, #MDREFR_SLFRSH @ write back mdrefr @ str r4, [r1, #MDREFR_OFFSET] ldr r4, [r1, #MDREFR_OFFSET] @ assert E1PIN @ if E0PIN is also used: #(MDREFR_E1PIN|MDREFR_E0PIN) orr r4, r4, #(MDREFR_E1PIN) @ write back mdrefr @ str r4, [r1, #MDREFR_OFFSET] ldr r4, [r1, #MDREFR_OFFSET] nop nop /* Step 4d: */ /* fetch platform value of mdcnfg */ @ ldr r2, =CONFIG_SYS_MDCNFG_VAL @ disable all sdram banks @ bic r2, r2, #(MDCNFG_DE0 | MDCNFG_DE1) bic r2, r2, #(MDCNFG_DE2 | MDCNFG_DE3) @ program banks 0/1 for bus width @ bic r2, r2, #MDCNFG_DWID0 @0=32-bit @ write initial value of mdcnfg, w/o enabling sdram banks @ str r2, [r1, #MDCNFG_OFFSET] /* Step 4e: Wait for the clock to the SDRAMs to stabilize, */ /* 100..200 �sec. */ 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] str r2, [r3] /* Step 4g: Write MDCNFG with enable bits asserted */ /* get memory controller base address */ ldr r1, =MEMC_BASE @fetch current mdcnfg value @ ldr r3, [r1, #MDCNFG_OFFSET] @enable sdram bank 0 if installed (must do for any populated bank) @ orr r3, r3, #MDCNFG_DE0 @write back mdcnfg, enabling the sdram bank(s) @ 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 r1, =CONFIG_SYS_ICMR_VAL /* mask all interrupts at the controller */ ldr r2, =ICMR 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 */ 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 @ Turn on needed clocks @ test: ldr r1, =CKEN ldr r2, =CONFIG_SYS_CKEN_VAL str r2, [r1] /* ---------------------------------------------------------------- */ /* */ /* ---------------------------------------------------------------- */ /* Save SDRAM size ?*/ ldr r1, =DRAM_SIZE str r8, [r1] /* 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