287 lines
6.3 KiB
C
287 lines
6.3 KiB
C
/*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Alex Zuepke <azu@sysgo.de>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <asm/io.h>
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#include <asm/system.h>
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#include <command.h>
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#include <common.h>
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#include <asm/arch/pxa-regs.h>
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/* Flush I/D-cache */
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static void cache_flush(void)
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{
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unsigned long i = 0;
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asm ("mcr p15, 0, %0, c7, c5, 0" : : "r" (i));
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}
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int cleanup_before_linux(void)
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{
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/*
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* This function is called just before we call Linux. It prepares
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* the processor for Linux by just disabling everything that can
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* disturb booting Linux.
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*/
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disable_interrupts();
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icache_disable();
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dcache_disable();
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cache_flush();
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return 0;
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}
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void pxa_wait_ticks(int ticks)
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{
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writel(0, OSCR);
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while (readl(OSCR) < ticks)
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asm volatile("" : : : "memory");
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}
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inline void writelrb(uint32_t val, uint32_t addr)
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{
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writel(val, addr);
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asm volatile("" : : : "memory");
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readl(addr);
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asm volatile("" : : : "memory");
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}
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void pxa2xx_dram_init(void)
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{
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uint32_t tmp;
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int i;
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/*
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* 1) Initialize Asynchronous static memory controller
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*/
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writelrb(CONFIG_SYS_MSC0_VAL, MSC0);
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writelrb(CONFIG_SYS_MSC1_VAL, MSC1);
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writelrb(CONFIG_SYS_MSC2_VAL, MSC2);
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/*
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* 2) Initialize Card Interface
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*/
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/* MECR: Memory Expansion Card Register */
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writelrb(CONFIG_SYS_MECR_VAL, MECR);
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/* MCMEM0: Card Interface slot 0 timing */
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writelrb(CONFIG_SYS_MCMEM0_VAL, MCMEM0);
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/* MCMEM1: Card Interface slot 1 timing */
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writelrb(CONFIG_SYS_MCMEM1_VAL, MCMEM1);
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/* MCATT0: Card Interface Attribute Space Timing, slot 0 */
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writelrb(CONFIG_SYS_MCATT0_VAL, MCATT0);
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/* MCATT1: Card Interface Attribute Space Timing, slot 1 */
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writelrb(CONFIG_SYS_MCATT1_VAL, MCATT1);
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/* MCIO0: Card Interface I/O Space Timing, slot 0 */
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writelrb(CONFIG_SYS_MCIO0_VAL, MCIO0);
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/* MCIO1: Card Interface I/O Space Timing, slot 1 */
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writelrb(CONFIG_SYS_MCIO1_VAL, MCIO1);
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/*
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* 3) Configure Fly-By DMA register
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*/
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writelrb(CONFIG_SYS_FLYCNFG_VAL, FLYCNFG);
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/*
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* 4) Initialize Timing for Sync Memory (SDCLK0)
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*/
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/*
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* Before accessing MDREFR we need a valid DRI field, so we set
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* this to power on defaults + DRI field.
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*/
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/* Read current MDREFR config and zero out DRI */
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tmp = readl(MDREFR) & ~0xfff;
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/* Add user-specified DRI */
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tmp |= CONFIG_SYS_MDREFR_VAL & 0xfff;
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/* Configure important bits */
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tmp |= MDREFR_K0RUN | MDREFR_SLFRSH;
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tmp &= ~(MDREFR_APD | MDREFR_E1PIN);
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/* Write MDREFR back */
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writelrb(tmp, MDREFR);
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/*
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* 5) Initialize Synchronous Static Memory (Flash/Peripherals)
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*/
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/* Initialize SXCNFG register. Assert the enable bits.
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*
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* Write SXMRS to cause an MRS command to all enabled banks of
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* synchronous static memory. Note that SXLCR need not be written
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* at this time.
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*/
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writelrb(CONFIG_SYS_SXCNFG_VAL, SXCNFG);
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/*
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* 6) Initialize SDRAM
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*/
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writelrb(CONFIG_SYS_MDREFR_VAL & ~MDREFR_SLFRSH, MDREFR);
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writelrb(CONFIG_SYS_MDREFR_VAL | MDREFR_E1PIN, MDREFR);
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/*
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* 7) Write MDCNFG with MDCNFG:DEx deasserted (set to 0), to configure
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* but not enable each SDRAM partition pair.
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*/
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writelrb(CONFIG_SYS_MDCNFG_VAL &
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~(MDCNFG_DE0 | MDCNFG_DE1 | MDCNFG_DE2 | MDCNFG_DE3), MDCNFG);
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/* Wait for the clock to the SDRAMs to stabilize, 100..200 usec. */
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pxa_wait_ticks(0x300);
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/*
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* 8) Trigger a number (usually 8) refresh cycles by attempting
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* non-burst read or write accesses to disabled SDRAM, as commonly
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* specified in the power up sequence documented in SDRAM data
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* sheets. The address(es) used for this purpose must not be
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* cacheable.
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*/
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for (i = 9; i >= 0; i--) {
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writel(i, 0xa0000000);
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asm volatile("" : : : "memory");
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}
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/*
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* 9) Write MDCNFG with enable bits asserted (MDCNFG:DEx set to 1).
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*/
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tmp = CONFIG_SYS_MDCNFG_VAL &
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(MDCNFG_DE0 | MDCNFG_DE1 | MDCNFG_DE2 | MDCNFG_DE3);
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tmp |= readl(MDCNFG);
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writelrb(tmp, MDCNFG);
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/*
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* 10) Write MDMRS.
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*/
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writelrb(CONFIG_SYS_MDMRS_VAL, MDMRS);
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/*
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* 11) Enable APD
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*/
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if (CONFIG_SYS_MDREFR_VAL & MDREFR_APD) {
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tmp = readl(MDREFR);
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tmp |= MDREFR_APD;
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writelrb(tmp, MDREFR);
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}
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}
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void pxa_gpio_setup(void)
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{
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writel(CONFIG_SYS_GPSR0_VAL, GPSR0);
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writel(CONFIG_SYS_GPSR1_VAL, GPSR1);
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writel(CONFIG_SYS_GPSR2_VAL, GPSR2);
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#if defined(CONFIG_CPU_PXA27X)
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writel(CONFIG_SYS_GPSR3_VAL, GPSR3);
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#endif
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writel(CONFIG_SYS_GPCR0_VAL, GPCR0);
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writel(CONFIG_SYS_GPCR1_VAL, GPCR1);
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writel(CONFIG_SYS_GPCR2_VAL, GPCR2);
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#if defined(CONFIG_CPU_PXA27X)
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writel(CONFIG_SYS_GPCR3_VAL, GPCR3);
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#endif
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writel(CONFIG_SYS_GPDR0_VAL, GPDR0);
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writel(CONFIG_SYS_GPDR1_VAL, GPDR1);
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writel(CONFIG_SYS_GPDR2_VAL, GPDR2);
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#if defined(CONFIG_CPU_PXA27X)
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writel(CONFIG_SYS_GPDR3_VAL, GPDR3);
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#endif
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writel(CONFIG_SYS_GAFR0_L_VAL, GAFR0_L);
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writel(CONFIG_SYS_GAFR0_U_VAL, GAFR0_U);
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writel(CONFIG_SYS_GAFR1_L_VAL, GAFR1_L);
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writel(CONFIG_SYS_GAFR1_U_VAL, GAFR1_U);
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writel(CONFIG_SYS_GAFR2_L_VAL, GAFR2_L);
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writel(CONFIG_SYS_GAFR2_U_VAL, GAFR2_U);
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#if defined(CONFIG_CPU_PXA27X)
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writel(CONFIG_SYS_GAFR3_L_VAL, GAFR3_L);
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writel(CONFIG_SYS_GAFR3_U_VAL, GAFR3_U);
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#endif
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writel(CONFIG_SYS_PSSR_VAL, PSSR);
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}
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void pxa_interrupt_setup(void)
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{
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writel(0, ICLR);
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writel(0, ICMR);
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#if defined(CONFIG_CPU_PXA27X)
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writel(0, ICLR2);
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writel(0, ICMR2);
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#endif
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}
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void pxa_clock_setup(void)
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{
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writel(CONFIG_SYS_CKEN, CKEN);
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writel(CONFIG_SYS_CCCR, CCCR);
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asm volatile("mcr p14, 0, %0, c6, c0, 0" : : "r"(0x0b));
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/* enable the 32Khz oscillator for RTC and PowerManager */
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writel(OSCC_OON, OSCC);
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while (!(readl(OSCC) & OSCC_OOK))
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asm volatile("" : : : "memory");
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}
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void pxa_wakeup(void)
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{
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uint32_t rcsr;
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rcsr = readl(RCSR);
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writel(rcsr & (RCSR_GPR | RCSR_SMR | RCSR_WDR | RCSR_HWR), RCSR);
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/* Wakeup */
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if (rcsr & RCSR_SMR) {
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writel(PSSR_PH, PSSR);
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pxa2xx_dram_init();
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icache_disable();
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dcache_disable();
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asm volatile("mov pc, %0" : : "r"(readl(PSPR)));
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}
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}
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int arch_cpu_init(void)
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{
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pxa_gpio_setup();
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pxa_wakeup();
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pxa_interrupt_setup();
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pxa_clock_setup();
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return 0;
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}
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void i2c_clk_enable(void)
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{
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/* Set the global I2C clock on */
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writel(readl(CKEN) | CKEN14_I2C, CKEN);
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}
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void __attribute__((weak)) reset_cpu(ulong ignored) __attribute__((noreturn));
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void reset_cpu(ulong ignored)
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{
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uint32_t tmp;
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setbits_le32(OWER, OWER_WME);
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tmp = readl(OSCR);
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tmp += 0x1000;
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writel(tmp, OSMR3);
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writel(MDREFR_SLFRSH, MDREFR);
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for (;;)
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;
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}
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