PXA: Fix reloc, Push lowlevel init into C code

Firstly, this fixes relocation issues. I had to use part of Dcache as RAM for a
while. I also moved around the lowlevel init code. It turned out so most of the
lowlevel init code ended in cpu.c (and eventually was rewritten into C).

This will also allow easier operation with FDT, multi-CPU-model support etc. in
later releases.

NOTE: This breaks most of the PXA boards (actually, the reloc stuff did already,
this only finishes the doom).

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

1 files changed, 228 insertions, 1 deletions

diff --git a/arch/arm/cpu/pxa/cpu.c b/arch/arm/cpu/pxa/cpu.c
index 330d013..3ea3458 100644
--- a/arch/arm/cpu/pxa/cpu.c
+++ b/arch/arm/cpu/pxa/cpu.c
@@ -30,11 +30,11 @@
  * CPU specific code
  */
 
-#include <asm/arch/pxa-regs.h>
 #include <asm/io.h>
 #include <asm/system.h>
 #include <command.h>
 #include <common.h>
+#include <asm/arch/pxa-regs.h>
 
 static void cache_flush(void);
 
@@ -91,3 +91,230 @@ void set_GPIO_mode(int gpio_mode)
 	writel(val, GAFR(gpio));
 }
 #endif /* CONFIG_CPU_MONAHANS */
+
+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_PXA27X) || defined(CONFIG_CPU_MONAHANS)
+	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_PXA27X) || defined(CONFIG_CPU_MONAHANS)
+	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_PXA27X) || defined(CONFIG_CPU_MONAHANS)
+	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_PXA27X) || defined(CONFIG_CPU_MONAHANS)
+	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_PXA27X) || defined(CONFIG_CPU_MONAHANS)
+	writel(0, ICLR2);
+	writel(0, ICMR2);
+#endif
+}
+
+void pxa_clock_setup(void)
+{
+#ifndef CONFIG_CPU_MONAHANS
+	writel(CONFIG_SYS_CKEN, CKEN);
+	writel(CONFIG_SYS_CCCR, CCCR);
+	asm volatile("mcr	p14, 0, %0, c6, c0, 0"::"r"(2));
+#else
+/* Set CKENA/CKENB/ACCR for MH */
+#endif
+
+	/* 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(PSSR)));
+	}
+}
+
+int arch_cpu_init(void)
+{
+	pxa_gpio_setup();
+//	pxa_wait_ticks(0x8000);
+	pxa_wakeup();
+	pxa_interrupt_setup();
+	pxa_clock_setup();
+	return 0;
+}