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-rw-r--r--arch/mips/sgi-ip27/ip27-xtalk.c242
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 0000000000..5143d1cf89
--- /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);