added start of pci implementation

2013-08-23 07:29:02 +00:00
parent 850f6a7827
commit 6342196e2b
3 changed files with 121 additions and 1 deletions
--- a/sources/pci.c
+++ b/sources/pci.c
@@ -0,0 +1,109 @@
+/*
+ * pci.c
+ *
+ *  Created on: 08.01.2013
+ *      Author: Markus Froeschle
+ */
+
+#include <MCF5475.h>
+#include "pci.h"
+#include "stdint.h"
+
+void init_eport(void)
+{
+	/* concigure IRQ1-7 pins on EPORT falling edge triggered */
+	MCF_EPORT_EPPAR = MCF_EPORT_EPPAR_EPPA7(MCF_EPORT_EPPAR_FALLING) +
+			MCF_EPORT_EPPAR_EPPA6(MCF_EPORT_EPPAR_FALLING) +
+			MCF_EPORT_EPPAR_EPPA5(MCF_EPORT_EPPAR_FALLING) +
+			MCF_EPORT_EPPAR_EPPA4(MCF_EPORT_EPPAR_FALLING) +
+			MCF_EPORT_EPPAR_EPPA3(MCF_EPORT_EPPAR_FALLING) +
+			MCF_EPORT_EPPAR_EPPA2(MCF_EPORT_EPPAR_FALLING) +
+			MCF_EPORT_EPPAR_EPPA1(MCF_EPORT_EPPAR_FALLING);
+	MCF_EPORT_EPDDR = 0;	/* clear data direction register. All pins as input */
+	MCF_EPORT_EPFR = 0;		/* clear all EPORT interrupt flags */
+	MCF_EPORT_EPIER = 0;	/* disable all EPORT interrupts (for now) */
+}
+
+void init_xlbus_arbiter(void)
+{
+	uint8_t clock_ratio;
+
+	/* setup XL bus arbiter */
+	clock_ratio = (MCF_PCI_PCIGSCR >> 24) & 0x07;
+	if (clock_ratio == 4)
+	{
+		/* device errata 26: Flexbus hang up in 4:1 clock ratio */
+		MCF_PCI_PCIGSCR |= 0x80000000; /* disable pipeline */
+	}
+	/* FIXME: Firetos (boot2.S, l. 719) looks pretty strange at this place - is this a typo? */
+}
+
+void init_pci(void)
+{
+	/*
+	 * assert /PCIRESET (reset cards on bus). FIXME: According to documentation,
+	 * this should be done last during PCI initialization
+	 */
+	MCF_PCI_PCIGSCR = MCF_PCI_PCIGSCR_PR;
+
+	/*
+	 * setup the PCI arbiter.
+	 */
+
+	/* PCI Arbiter Control Register (PACR) */
+	MCF_PCIARB_PACR = MCF_PCIARB_PACR_INTMPRI		/* internal master priority level high */
+					+ MCF_PCIARB_PACR_EXTMPRI(0x1f) /* external master priority levels all high */
+					+ MCF_PCIARB_PACR_INTMINTEN		/* generate interrupt if internal master timeout */
+					+ MCF_PCIARB_PACR_EXTMINTEN(0x1f);	/* generate interrupt if external master timeout */
+	/* configure all 5 PCI Bus Grant pins for PCI */
+	MCF_PAD_PAR_PCIBG = 0x3ff;
+	/* configure all 5 PCI Bus Request pins for PCI */
+	MCF_PAD_PAR_PCIBR = 0x3ff;
+
+	/* PCI Status/Command Register PCISCR */
+	MCF_PCI_PCISCR = MCF_PCI_PCISCR_M	/* recognize memory accesses */
+				+ MCF_PCI_PCISCR_B			/* bus master enable for controller */
+				+ MCF_PCI_PCISCR_MW;		/* controller can generate memory write and invalidate command */
+
+	/* Configuration 1 Register PCICR1 */
+	MCF_PCI_PCICR1 = MCF_PCI_PCICR1_CACHELINESIZE(8)	/* cache line size in units of DWORDs */
+				+ MCF_PCI_PCICR1_LATTIMER(32);			/* 256 PCI clocks (?) latency */
+	/* Configuration 2 Register PCICR2 */
+	MCF_PCI_PCICR2 = MCF_PCI_PCICR2_MINGNT(1)	/* specifies how long the Coldfire processor retains bus ownership as master */
+			+ MCF_PCI_PCICR2_MAXLAT(1);			/* specifies (in units of 1/4 microseconds) how often the Coldfire */
+												/* processor needs access to the bus as PCI master */
+	/* Initiator Control Register: turn on error signaling */
+	MCF_PCI_PCIICR = MCF_PCI_PCIICR_TAE +				/* target abort enable: CPU generates an interrupt if target terminates a transaction */
+			MCF_PCI_PCIICR_IAE 							/* the same for the initiator */
+		/* + MCF_PCI_PCIICR_REE */ ;					/* the same for retry errors */
+	/* Global Status/Control Register */
+	MCF_PCI_PCIGSCR |= MCF_PCI_PCIGSCR_SEE;				/* generate interrupt if /PCISERR is asserted (PCI system error) */
+
+	/* configure initiator windows */
+
+
+	/* Initiator Window 0 Base / Translation Address Register */
+#ifdef SAME_CPU_PCI_MEM_ADDR
+	MCF_PCI_PCIIW0BTAR = (PCI_MEMORY_OFFSET + ((PCI_MEMORY_SIZE - 1) >> 8) & 0xFFFF0000) | (PCI_MEMORY_OFFSET >> 16 & 0xFFFF)
+#else
+	MCF_PCI_PCIIW0BTAR = PCI_MEMORY_OFFSET + ((PCI_MEMORY_SIZE - 1) >> 8)	& 0xFFFF0000;
+#endif /* SAME_CPU_PCI_MEM_ADDR */
+
+	/* Initiator Window 1 Base / Translation Address Register */
+	MCF_PCI_PCIIW1BTAR = (PCI_IO_OFFSET + ((PCI_IO_SIZE - 1) >> 8)) & 0xFFFF0000;
+
+	/* Initiator Window 2 Base / Translation Address Register */
+	MCF_PCI_PCIIW2BTAR = 0L;	/* not used */
+
+	MCF_PCI_PCIIWCR = MCF_PCI_PCIIWCR_WINCTRL0_MEMRDLINE
+			+ MCF_PCI_PCIIWCR_WINCTRL1_IO;
+
+	/* target zones */
+}
+
+void init(void)
+{
+	init_eport();
+	init_xlbus_arbiter();
+	init_pci();
+}