1 files changed, 242 insertions, 0 deletions

diff --git a/arch/mips/sgi-ip27/ip27-xtalk.c b/arch/mips/sgi-ip27/ip27-xtalk.c
new file mode 100644
index 000000000..5143d1cf8
--- /dev/null
+++ b/arch/mips/sgi-ip27/ip27-xtalk.c
@@ -0,0 +1,242 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 1999, 2000 Ralf Baechle (ralf@gnu.org)
+ * Copyright (C) 1999, 2000 Silcon Graphics, Inc.
+ * Copyright (C) 2004 Christoph Hellwig.
+ *
+ * Generic XTALK initialization code
+ */
+
+#include <linux/kernel.h>
+#include <linux/smp.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/sgi-w1.h>
+#include <linux/platform_data/xtalk-bridge.h>
+#include <asm/sn/addrs.h>
+#include <asm/sn/types.h>
+#include <asm/sn/klconfig.h>
+#include <asm/pci/bridge.h>
+#include <asm/xtalk/xtalk.h>
+
+
+#define XBOW_WIDGET_PART_NUM	0x0
+#define XXBOW_WIDGET_PART_NUM	0xd000	/* Xbow in Xbridge */
+#define BASE_XBOW_PORT		8     /* Lowest external port */
+
+static void bridge_platform_create(nasid_t nasid, int widget, int masterwid)
+{
+	struct xtalk_bridge_platform_data *bd;
+	struct sgi_w1_platform_data *wd;
+	struct platform_device *pdev_wd;
+	struct platform_device *pdev_bd;
+	struct resource w1_res;
+	unsigned long offset;
+
+	offset = NODE_OFFSET(nasid);
+
+	wd = kzalloc(sizeof(*wd), GFP_KERNEL);
+	if (!wd) {
+		pr_warn("xtalk:n%d/%x bridge create out of memory\n", nasid, widget);
+		return;
+	}
+
+	snprintf(wd->dev_id, sizeof(wd->dev_id), "bridge-%012lx",
+		 offset + (widget << SWIN_SIZE_BITS));
+
+	memset(&w1_res, 0, sizeof(w1_res));
+	w1_res.start = offset + (widget << SWIN_SIZE_BITS) +
+				offsetof(struct bridge_regs, b_nic);
+	w1_res.end = w1_res.start + 3;
+	w1_res.flags = IORESOURCE_MEM;
+
+	pdev_wd = platform_device_alloc("sgi_w1", PLATFORM_DEVID_AUTO);
+	if (!pdev_wd) {
+		pr_warn("xtalk:n%d/%x bridge create out of memory\n", nasid, widget);
+		goto err_kfree_wd;
+	}
+	if (platform_device_add_resources(pdev_wd, &w1_res, 1)) {
+		pr_warn("xtalk:n%d/%x bridge failed to add platform resources.\n", nasid, widget);
+		goto err_put_pdev_wd;
+	}
+	if (platform_device_add_data(pdev_wd, wd, sizeof(*wd))) {
+		pr_warn("xtalk:n%d/%x bridge failed to add platform data.\n", nasid, widget);
+		goto err_put_pdev_wd;
+	}
+	if (platform_device_add(pdev_wd)) {
+		pr_warn("xtalk:n%d/%x bridge failed to add platform device.\n", nasid, widget);
+		goto err_put_pdev_wd;
+	}
+	/* platform_device_add_data() duplicates the data */
+	kfree(wd);
+
+	bd = kzalloc(sizeof(*bd), GFP_KERNEL);
+	if (!bd) {
+		pr_warn("xtalk:n%d/%x bridge create out of memory\n", nasid, widget);
+		goto err_unregister_pdev_wd;
+	}
+	pdev_bd = platform_device_alloc("xtalk-bridge", PLATFORM_DEVID_AUTO);
+	if (!pdev_bd) {
+		pr_warn("xtalk:n%d/%x bridge create out of memory\n", nasid, widget);
+		goto err_kfree_bd;
+	}
+
+
+	bd->bridge_addr = RAW_NODE_SWIN_BASE(nasid, widget);
+	bd->intr_addr	= BIT_ULL(47) + 0x01800000 + PI_INT_PEND_MOD;
+	bd->nasid	= nasid;
+	bd->masterwid	= masterwid;
+
+	bd->mem.name	= "Bridge PCI MEM";
+	bd->mem.start	= offset + (widget << SWIN_SIZE_BITS) + BRIDGE_DEVIO0;
+	bd->mem.end	= offset + (widget << SWIN_SIZE_BITS) + SWIN_SIZE - 1;
+	bd->mem.flags	= IORESOURCE_MEM;
+	bd->mem_offset	= offset;
+
+	bd->io.name	= "Bridge PCI IO";
+	bd->io.start	= offset + (widget << SWIN_SIZE_BITS) + BRIDGE_DEVIO0;
+	bd->io.end	= offset + (widget << SWIN_SIZE_BITS) + SWIN_SIZE - 1;
+	bd->io.flags	= IORESOURCE_IO;
+	bd->io_offset	= offset;
+
+	if (platform_device_add_data(pdev_bd, bd, sizeof(*bd))) {
+		pr_warn("xtalk:n%d/%x bridge failed to add platform data.\n", nasid, widget);
+		goto err_put_pdev_bd;
+	}
+	if (platform_device_add(pdev_bd)) {
+		pr_warn("xtalk:n%d/%x bridge failed to add platform device.\n", nasid, widget);
+		goto err_put_pdev_bd;
+	}
+	/* platform_device_add_data() duplicates the data */
+	kfree(bd);
+	pr_info("xtalk:n%d/%x bridge widget\n", nasid, widget);
+	return;
+
+err_put_pdev_bd:
+	platform_device_put(pdev_bd);
+err_kfree_bd:
+	kfree(bd);
+err_unregister_pdev_wd:
+	platform_device_unregister(pdev_wd);
+	return;
+err_put_pdev_wd:
+	platform_device_put(pdev_wd);
+err_kfree_wd:
+	kfree(wd);
+	return;
+}
+
+static int probe_one_port(nasid_t nasid, int widget, int masterwid)
+{
+	widgetreg_t		widget_id;
+	xwidget_part_num_t	partnum;
+
+	widget_id = *(volatile widgetreg_t *)
+		(RAW_NODE_SWIN_BASE(nasid, widget) + WIDGET_ID);
+	partnum = XWIDGET_PART_NUM(widget_id);
+
+	switch (partnum) {
+	case BRIDGE_WIDGET_PART_NUM:
+	case XBRIDGE_WIDGET_PART_NUM:
+		bridge_platform_create(nasid, widget, masterwid);
+		break;
+	default:
+		pr_info("xtalk:n%d/%d unknown widget (0x%x)\n",
+			nasid, widget, partnum);
+		break;
+	}
+
+	return 0;
+}
+
+static int xbow_probe(nasid_t nasid)
+{
+	lboard_t *brd;
+	klxbow_t *xbow_p;
+	unsigned masterwid, i;
+
+	/*
+	 * found xbow, so may have multiple bridges
+	 * need to probe xbow
+	 */
+	brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_MIDPLANE8);
+	if (!brd)
+		return -ENODEV;
+
+	xbow_p = (klxbow_t *)find_component(brd, NULL, KLSTRUCT_XBOW);
+	if (!xbow_p)
+		return -ENODEV;
+
+	/*
+	 * Okay, here's a xbow. Let's arbitrate and find
+	 * out if we should initialize it. Set enabled
+	 * hub connected at highest or lowest widget as
+	 * master.
+	 */
+#ifdef WIDGET_A
+	i = HUB_WIDGET_ID_MAX + 1;
+	do {
+		i--;
+	} while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) ||
+		 (!XBOW_PORT_IS_ENABLED(xbow_p, i)));
+#else
+	i = HUB_WIDGET_ID_MIN - 1;
+	do {
+		i++;
+	} while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) ||
+		 (!XBOW_PORT_IS_ENABLED(xbow_p, i)));
+#endif
+
+	masterwid = i;
+	if (nasid != XBOW_PORT_NASID(xbow_p, i))
+		return 1;
+
+	for (i = HUB_WIDGET_ID_MIN; i <= HUB_WIDGET_ID_MAX; i++) {
+		if (XBOW_PORT_IS_ENABLED(xbow_p, i) &&
+		    XBOW_PORT_TYPE_IO(xbow_p, i))
+			probe_one_port(nasid, i, masterwid);
+	}
+
+	return 0;
+}
+
+static void xtalk_probe_node(nasid_t nasid)
+{
+	volatile u64		hubreg;
+	xwidget_part_num_t	partnum;
+	widgetreg_t		widget_id;
+
+	hubreg = REMOTE_HUB_L(nasid, IIO_LLP_CSR);
+
+	/* check whether the link is up */
+	if (!(hubreg & IIO_LLP_CSR_IS_UP))
+		return;
+
+	widget_id = *(volatile widgetreg_t *)
+		       (RAW_NODE_SWIN_BASE(nasid, 0x0) + WIDGET_ID);
+	partnum = XWIDGET_PART_NUM(widget_id);
+
+	switch (partnum) {
+	case BRIDGE_WIDGET_PART_NUM:
+		bridge_platform_create(nasid, 0x8, 0xa);
+		break;
+	case XBOW_WIDGET_PART_NUM:
+	case XXBOW_WIDGET_PART_NUM:
+		pr_info("xtalk:n%d/0 xbow widget\n", nasid);
+		xbow_probe(nasid);
+		break;
+	default:
+		pr_info("xtalk:n%d/0 unknown widget (0x%x)\n", nasid, partnum);
+		break;
+	}
+}
+
+static int __init xtalk_init(void)
+{
+	nasid_t nasid;
+
+	for_each_online_node(nasid)
+		xtalk_probe_node(nasid);
+
+	return 0;
+}
+arch_initcall(xtalk_init);