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