avionic design with actual uboot and tooling

submodule of avionic design uboot bootloader and with included tools to
get you started , read readme.md and readme-tk1-loader.md

u-boot/arch/powerpc/cpu/mpc8260/commproc.c

@@ -0,0 +1,178 @@
+/*
+ * This file is based on "arch/powerpc/8260_io/commproc.c" - here is it's
+ * copyright notice:
+ *
+ * General Purpose functions for the global management of the
+ * 8260 Communication Processor Module.
+ * Copyright (c) 1999 Dan Malek (dmalek@jlc.net)
+ * Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com)
+ *	2.3.99 Updates
+ *
+ * In addition to the individual control of the communication
+ * channels, there are a few functions that globally affect the
+ * communication processor.
+ *
+ * Buffer descriptors must be allocated from the dual ported memory
+ * space.  The allocator for that is here.  When the communication
+ * process is reset, we reclaim the memory available.  There is
+ * currently no deallocator for this memory.
+ */
+#include <common.h>
+#include <asm/cpm_8260.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+void
+m8260_cpm_reset(void)
+{
+	volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
+	volatile ulong count;
+
+	/* Reclaim the DP memory for our use.
+	*/
+	gd->arch.dp_alloc_base = CPM_DATAONLY_BASE;
+	gd->arch.dp_alloc_top = gd->arch.dp_alloc_base + CPM_DATAONLY_SIZE;
+
+	/*
+	 * Reset CPM
+	 */
+	immr->im_cpm.cp_cpcr = CPM_CR_RST;
+	count = 0;
+	do {			/* Spin until command processed		*/
+		__asm__ __volatile__ ("eieio");
+	} while ((immr->im_cpm.cp_cpcr & CPM_CR_FLG) && ++count < 1000000);
+
+#ifdef CONFIG_HARD_I2C
+	immr->im_dprambase16[PROFF_I2C_BASE / sizeof(u16)] = 0;
+#endif
+}
+
+/* Allocate some memory from the dual ported ram.
+ * To help protocols with object alignment restrictions, we do that
+ * if they ask.
+ */
+uint
+m8260_cpm_dpalloc(uint size, uint align)
+{
+	volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
+	uint	retloc;
+	uint	align_mask, off;
+	uint	savebase;
+
+	align_mask = align - 1;
+	savebase = gd->arch.dp_alloc_base;
+
+	off = gd->arch.dp_alloc_base & align_mask;
+	if (off != 0)
+		gd->arch.dp_alloc_base += (align - off);
+
+	if ((off = size & align_mask) != 0)
+		size += align - off;
+
+	if ((gd->arch.dp_alloc_base + size) >= gd->arch.dp_alloc_top) {
+		gd->arch.dp_alloc_base = savebase;
+		panic("m8260_cpm_dpalloc: ran out of dual port ram!");
+	}
+
+	retloc = gd->arch.dp_alloc_base;
+	gd->arch.dp_alloc_base += size;
+
+	memset((void *)&immr->im_dprambase[retloc], 0, size);
+
+	return(retloc);
+}
+
+/* We also own one page of host buffer space for the allocation of
+ * UART "fifos" and the like.
+ */
+uint
+m8260_cpm_hostalloc(uint size, uint align)
+{
+	/* the host might not even have RAM yet - just use dual port RAM */
+	return (m8260_cpm_dpalloc(size, align));
+}
+
+/* Set a baud rate generator.  This needs lots of work.  There are
+ * eight BRGs, which can be connected to the CPM channels or output
+ * as clocks.  The BRGs are in two different block of internal
+ * memory mapped space.
+ * The baud rate clock is the system clock divided by something.
+ * It was set up long ago during the initial boot phase and is
+ * is given to us.
+ * Baud rate clocks are zero-based in the driver code (as that maps
+ * to port numbers).  Documentation uses 1-based numbering.
+ */
+#define BRG_INT_CLK	gd->arch.brg_clk
+#define BRG_UART_CLK	(BRG_INT_CLK / 16)
+
+/* This function is used by UARTs, or anything else that uses a 16x
+ * oversampled clock.
+ */
+void
+m8260_cpm_setbrg(uint brg, uint rate)
+{
+	volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
+	volatile uint	*bp;
+	uint cd = BRG_UART_CLK / rate;
+
+	if ((BRG_UART_CLK % rate) < (rate / 2))
+		cd--;
+	if (brg < 4) {
+		bp = (uint *)&immr->im_brgc1;
+	}
+	else {
+		bp = (uint *)&immr->im_brgc5;
+		brg -= 4;
+	}
+	bp += brg;
+	*bp = (cd << 1) | CPM_BRG_EN;
+}
+
+/* This function is used to set high speed synchronous baud rate
+ * clocks.
+ */
+void
+m8260_cpm_fastbrg(uint brg, uint rate, int div16)
+{
+	volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
+	volatile uint	*bp;
+
+	/* This is good enough to get SMCs running.....
+	*/
+	if (brg < 4) {
+		bp = (uint *)&immr->im_brgc1;
+	}
+	else {
+		bp = (uint *)&immr->im_brgc5;
+		brg -= 4;
+	}
+	bp += brg;
+	*bp = (((((BRG_INT_CLK+rate-1)/rate)-1)&0xfff)<<1)|CPM_BRG_EN;
+	if (div16)
+		*bp |= CPM_BRG_DIV16;
+}
+
+/* This function is used to set baud rate generators using an external
+ * clock source and 16x oversampling.
+ */
+
+void
+m8260_cpm_extcbrg(uint brg, uint rate, uint extclk, int pinsel)
+{
+	volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
+	volatile uint	*bp;
+
+	if (brg < 4) {
+		bp = (uint *)&immr->im_brgc1;
+	}
+	else {
+		bp = (uint *)&immr->im_brgc5;
+		brg -= 4;
+	}
+	bp += brg;
+	*bp = ((((((extclk/16)+rate-1)/rate)-1)&0xfff)<<1)|CPM_BRG_EN;
+	if (pinsel == 0)
+		*bp |= CPM_BRG_EXTC_CLK3_9;
+	else
+		*bp |= CPM_BRG_EXTC_CLK5_15;
+}