PXA: Separate PXA2xx CPU init

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>

1 files changed, 301 insertions, 0 deletions

diff --git a/arch/arm/cpu/pxa/pxa2xx.c b/arch/arm/cpu/pxa/pxa2xx.c
new file mode 100644
index 0000000000..e7b475d162
--- /dev/null
+++ b/arch/arm/cpu/pxa/pxa2xx.c
@@ -0,0 +1,301 @@
+/*
+ * (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>
+ *
+ * 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 <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 pxa_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"(2));
+
+	/* 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);
+		pxa_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 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);
+
+	for (;;)
+		;
+}