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// 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/sn/hub.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;
struct resource w1_res;
unsigned long offset;
offset = NODE_OFFSET(nasid);
wd = kzalloc(sizeof(*wd), GFP_KERNEL);
if (!wd)
goto no_mem;
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 = platform_device_alloc("sgi_w1", PLATFORM_DEVID_AUTO);
if (!pdev) {
kfree(wd);
goto no_mem;
}
platform_device_add_resources(pdev, &w1_res, 1);
platform_device_add_data(pdev, wd, sizeof(*wd));
platform_device_add(pdev);
bd = kzalloc(sizeof(*bd), GFP_KERNEL);
if (!bd)
goto no_mem;
pdev = platform_device_alloc("xtalk-bridge", PLATFORM_DEVID_AUTO);
if (!pdev) {
kfree(bd);
goto no_mem;
}
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;
platform_device_add_data(pdev, bd, sizeof(*bd));
platform_device_add(pdev);
pr_info("xtalk:n%d/%x bridge widget\n", nasid, widget);
return;
no_mem:
pr_warn("xtalk:n%d/%x bridge create out of memory\n", nasid, widget);
}
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);
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