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+/*
+ * This was originally from the Lubbock u-boot port.
+ *
+ * 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>
+
+/* 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:
+
+ /* 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, =GPSR3
+ ldr r1, =CFG_GPSR3_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, =GPCR3
+ ldr r1, =CFG_GPCR3_VAL
+ str r1, [r0]
+
+ ldr r0, =GRER0
+ ldr r1, =CFG_GRER0_VAL
+ str r1, [r0]
+
+ ldr r0, =GRER1
+ ldr r1, =CFG_GRER1_VAL
+ str r1, [r0]
+
+ ldr r0, =GRER2
+ ldr r1, =CFG_GRER2_VAL
+ str r1, [r0]
+
+ ldr r0, =GRER3
+ ldr r1, =CFG_GRER3_VAL
+ str r1, [r0]
+
+ ldr r0, =GFER0
+ ldr r1, =CFG_GFER0_VAL
+ str r1, [r0]
+
+ ldr r0, =GFER1
+ ldr r1, =CFG_GFER1_VAL
+ str r1, [r0]
+
+ ldr r0, =GFER2
+ ldr r1, =CFG_GFER2_VAL
+ str r1, [r0]
+
+ ldr r0, =GFER3
+ ldr r1, =CFG_GFER3_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, =GPDR3
+ ldr r1, =CFG_GPDR3_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, =GAFR3_L
+ ldr r1, =CFG_GAFR3_L_VAL
+ str r1, [r0]
+
+ ldr r0, =GAFR3_U
+ ldr r1, =CFG_GAFR3_U_VAL
+ str r1, [r0]
+
+ ldr r0, =PSSR /* enable GPIO pins */
+ ldr r1, =CFG_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, =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??? */
+ /* ---------------------------------------------------------------- */
+ ldr r2, =CFG_FLYCNFG_VAL
+ str r2, [r1, #FLYCNFG_OFFSET]
+ str r2, [r1, #FLYCNFG_OFFSET]
+
+ /* ---------------------------------------------------------------- */
+ /* 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 r4, [r1, #MDREFR_OFFSET]
+ ldr r2, =0xFFF
+ bic r4, r4, r2
+
+ ldr r3, =CFG_MDREFR_VAL
+ and r3, r3, r2
+
+ orr r4, r4, r3
+ str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
+
+ orr r4, r4, #MDREFR_K0RUN
+ orr r4, r4, #MDREFR_K0DB4
+ orr r4, r4, #MDREFR_K0FREE
+ orr r4, r4, #MDREFR_K0DB2
+ orr r4, r4, #MDREFR_K1DB2
+ bic r4, r4, #MDREFR_K1FREE
+ bic r4, r4, #MDREFR_K2FREE
+
+ 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. */
+
+ ldr r2, =CFG_SXCNFG_VAL
+ str r2, [r1, #SXCNFG_OFFSET]
+
+ /* ---------------------------------------------------------------- */
+ /* Step 4: Initialize SDRAM */
+ /* ---------------------------------------------------------------- */
+
+ bic r4, r4, #(MDREFR_K2FREE |MDREFR_K1FREE | MDREFR_K0FREE)
+
+ orr r4, r4, #MDREFR_K1RUN
+ bic r4, r4, #MDREFR_K2DB2
+ str r4, [r1, #MDREFR_OFFSET]
+ ldr r4, [r1, #MDREFR_OFFSET]
+
+ bic r4, r4, #MDREFR_SLFRSH
+ str r4, [r1, #MDREFR_OFFSET]
+ ldr r4, [r1, #MDREFR_OFFSET]
+
+ orr r4, r4, #MDREFR_E1PIN
+ str r4, [r1, #MDREFR_OFFSET]
+ ldr r4, [r1, #MDREFR_OFFSET]
+
+ nop
+ nop
+
+
+ /* 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)
+ bic r4, r4, #(MDCNFG_DE2|MDCNFG_DE3)
+
+ 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, =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]
+
+
+ /* Step 4g: Write MDCNFG with enable bits asserted */
+ /* (MDCNFG:DEx set to 1). */
+
+ ldr r3, [r1, #MDCNFG_OFFSET]
+ mov r4, r3
+ orr r3, r3, #MDCNFG_DE0
+ str r3, [r1, #MDCNFG_OFFSET]
+ mov r0, r3
+
+ /* Step 4h: Write MDMRS. */
+
+ ldr r2, =CFG_MDMRS_VAL
+ str r2, [r1, #MDMRS_OFFSET]
+
+ /* enable APD */
+ ldr r3, [r1, #MDREFR_OFFSET]
+ orr r3, r3, #MDREFR_APD
+ str r3, [r1, #MDREFR_OFFSET]
+
+ /* We are finished with Intel's memory controller initialisation */
+
+
+setvoltage:
+
+ mov r10, lr
+ bl initPXAvoltage /* In case the board is rebooting with a */
+ mov lr, r10 /* low voltage raise it up to a good one. */
+
+#if 1
+ b initirqs
+#endif
+
+wakeup:
+ /* Are we waking from sleep? */
+ ldr r0, =RCSR
+ ldr r1, [r0]
+ and r1, r1, #(RCSR_GPR | RCSR_SMR | RCSR_WDR | RCSR_HWR)
+ str r1, [r0]
+ teq r1, #RCSR_SMR
+
+ bne initirqs
+
+ ldr r0, =PSSR
+ mov r1, #PSSR_PH
+ str r1, [r0]
+
+ /* if so, resume at PSPR */
+ ldr r0, =PSPR
+ ldr r1, [r0]
+ mov pc, r1
+
+ /* ---------------------------------------------------------------- */
+ /* 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 */
+
+ /* Turn Off on-chip peripheral clocks (except for memory) */
+ /* for re-configuration. */
+ ldr r1, =CKEN
+ ldr r2, =CFG_CKEN
+ str r2, [r1]
+
+ /* ... and write the core clock config register */
+ ldr r2, =CFG_CCCR
+ ldr r1, =CCCR
+ str r2, [r1]
+
+ /* Turn on turbo mode */
+ mrc p14, 0, r2, c6, c0, 0
+ orr r2, r2, #0xB /* Turbo, Fast-Bus, Freq change**/
+ mcr p14, 0, r2, c6, c0, 0
+
+ /* Re-write MDREFR */
+ ldr r1, =MEMC_BASE
+ ldr r2, [r1, #MDREFR_OFFSET]
+ str r2, [r1, #MDREFR_OFFSET]
+#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
+#else
+#error "RTC not defined"
+#endif
+
+ /* Interrupt init: Mask all interrupts */
+ ldr r0, =ICMR /* enable no sources */
+ mov r1, #0
+ str r1, [r0]
+ /* FIXME */
+
+#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