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List:       linuxppc-embedded
Subject:    [PATCH NEXT 1/4] powerpc/pasemi: Add PCI initialisation for Nemo board.
From:       Darren Stevens <darren () stevens-zone ! net>
Date:       2017-12-31 22:00:14
Message-ID: 4b3d1ee02c7.3de0aa2c () auth ! smtp ! 1and1 ! co ! uk
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    The A-Eon Amigaone X1000's Nemo motherboard has an AMD SB600
    connected to one of the PCI-e root ports on its PaSemi
    Pwrficient 1628M SoC. Normally the SB600 southbridge would be
    connected to a hidden PCI-e port on the system's northbridge,
    and as a result doesn't fully comply with the PCI-e spec.
    
    Add code to relax the PCI-e detection in both the root port
    and the Linux kernel allowing on board devices to be detected.
    
    Signed-off-by: Darren Stevens <Darren@stevens-zone.net>

---

["pci.patch" (text/plain)]

diff --git a/arch/powerpc/platforms/pasemi/pasemi.h b/arch/powerpc/platforms/pasemi/pasemi.h
index 329d2a6..8900dee 100644
--- a/arch/powerpc/platforms/pasemi/pasemi.h
+++ b/arch/powerpc/platforms/pasemi/pasemi.h
@@ -3,6 +3,9 @@
 #define _PASEMI_PASEMI_H
 
 extern unsigned long pas_get_boot_time(void);
+#ifdef CONFIG_PPC_PASEMI_NEMO
+extern void nemo_pci_init(void);
+#endif
 extern void pas_pci_init(void);
 extern void pas_pci_irq_fixup(struct pci_dev *dev);
 extern void pas_pci_dma_dev_setup(struct pci_dev *dev);
diff --git a/arch/powerpc/platforms/pasemi/pci.c b/arch/powerpc/platforms/pasemi/pci.c
index 5ff6108..cb0ac87 100644
--- a/arch/powerpc/platforms/pasemi/pci.c
+++ b/arch/powerpc/platforms/pasemi/pci.c
@@ -27,6 +27,7 @@
 #include <linux/pci.h>
 
 #include <asm/pci-bridge.h>
+#include <asm/isa-bridge.h>
 #include <asm/machdep.h>
 
 #include <asm/ppc-pci.h>
@@ -108,6 +109,92 @@ static int workaround_5945(struct pci_bus *bus, unsigned int devfn,
 	return 1;
 }
 
+#ifdef CONFIG_PPC_PASEMI_NEMO
+static int sb600_bus = 5;
+static void __iomem *iob_mapbase = NULL;
+
+static void sb600_set_flag(int bus)
+{
+	struct resource res;
+	struct device_node *dn;
+	int err;
+
+	if (iob_mapbase == NULL) {
+		dn = of_find_compatible_node(NULL, "isa", "pasemi,1682m-iob");
+		if (!dn) {
+			printk(KERN_CRIT "NEMO SB600 missing iob node\n");
+			return;
+		}
+
+		err = of_address_to_resource(dn, 0, &res);
+		of_node_put(dn);
+
+		if (err) {
+			printk(KERN_CRIT "NEMO SB600 missing resource\n");
+			return;
+		}
+
+		printk(KERN_CRIT "NEMO SB600 IOB base %08lx\n",res.start);
+
+		iob_mapbase = ioremap(res.start + 0x100, 0x94);
+	}
+
+	if (iob_mapbase != NULL) {
+		if (bus == sb600_bus) {
+			/*
+			 * This is the SB600's bus, tell the PCI-e root port
+			 * to allow non-zero devices to enumerate.
+			 */
+			out_le32(iob_mapbase + 4, in_le32(iob_mapbase + 4) | 0x800);
+		} else {
+			/*
+			 * Only scan device 0 on other busses
+			 */
+			out_le32(iob_mapbase + 4, in_le32(iob_mapbase + 4) & ~0x800);
+		}
+	}
+}
+
+static int nemo_pxp_read_config(struct pci_bus *bus, unsigned int devfn,
+			      int offset, int len, u32 *val)
+{
+	struct pci_controller *hose;
+	void volatile __iomem *addr;
+
+	hose = pci_bus_to_host(bus);
+	if (!hose)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	if (!pa_pxp_offset_valid(bus->number, devfn, offset))
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	if (workaround_5945(bus, devfn, offset, len, val))
+		return PCIBIOS_SUCCESSFUL;
+
+	addr = pa_pxp_cfg_addr(hose, bus->number, devfn, offset);
+
+	sb600_set_flag(bus->number);
+
+	/*
+	 * Note: the caller has already checked that offset is
+	 * suitably aligned and that len is 1, 2 or 4.
+	 */
+	switch (len) {
+	case 1:
+		*val = in_8(addr);
+		break;
+	case 2:
+		*val = in_le16(addr);
+		break;
+	default:
+		*val = in_le32(addr);
+		break;
+	}
+
+	return PCIBIOS_SUCCESSFUL;
+}
+#endif
+
 static int pa_pxp_read_config(struct pci_bus *bus, unsigned int devfn,
 			      int offset, int len, u32 *val)
 {
@@ -178,6 +265,20 @@ static int pa_pxp_write_config(struct pci_bus *bus, unsigned int devfn,
 	return PCIBIOS_SUCCESSFUL;
 }
 
+#ifdef CONFIG_PPC_PASEMI_NEMO
+static struct pci_ops nemo_pxp_ops = {
+	.read = nemo_pxp_read_config,
+	.write = pa_pxp_write_config,
+};
+
+static void __init setup_nemo_pxp(struct pci_controller *hose)
+{
+	hose->ops = &nemo_pxp_ops;
+	hose->cfg_data = ioremap(0xe0000000, 0x10000000);
+}
+
+#endif
+
 static struct pci_ops pa_pxp_ops = {
 	.read = pa_pxp_read_config,
 	.write = pa_pxp_write_config,
@@ -189,6 +290,35 @@ static void __init setup_pa_pxp(struct pci_controller *hose)
 	hose->cfg_data = ioremap(0xe0000000, 0x10000000);
 }
 
+#ifdef CONFIG_PPC_PASEMI_NEMO
+static int __init nemo_add_bridge(struct device_node *dev)
+{
+	struct pci_controller *hose;
+
+	pr_debug("Adding PCI host bridge %pOF\n", dev);
+
+	hose = pcibios_alloc_controller(dev);
+	if (!hose)
+		return -ENOMEM;
+
+	hose->first_busno = 0;
+	hose->last_busno = 0xff;
+	hose->controller_ops = pasemi_pci_controller_ops;
+
+	setup_nemo_pxp(hose);
+
+	printk(KERN_INFO "Found PA-PXP PCI host bridge.\n");
+
+	/* Interpret the "ranges" property */
+	pci_process_bridge_OF_ranges(hose, dev, 1);
+
+	/* Scan for an isa bridge. */
+	isa_bridge_find_early(hose);
+
+	return 0;
+}
+#endif
+
 static int __init pas_add_bridge(struct device_node *dev)
 {
 	struct pci_controller *hose;
@@ -213,6 +343,28 @@ static int __init pas_add_bridge(struct device_node *dev)
 	return 0;
 }
 
+#ifdef CONFIG_PPC_PASEMI_NEMO
+void __init nemo_pci_init(void)
+{
+	struct device_node *np, *root;
+
+	root = of_find_node_by_path("/");
+	if (!root) {
+		printk(KERN_CRIT "pas_pci_init: can't find root "
+			"of device tree\n");
+		return;
+	}
+
+	pci_set_flags(PCI_SCAN_ALL_PCIE_DEVS);
+
+	for (np = NULL; (np = of_get_next_child(root, np)) != NULL;)
+		if (np->name && !strcmp(np->name, "pxp") && !nemo_add_bridge(np))
+			of_node_get(np);
+
+	of_node_put(root);
+}
+#endif
+
 void __init pas_pci_init(void)
 {
 	struct device_node *np, *root;


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