arch/mips/sgi-ip30/ip30-xtalk.c

Source file repositories/reference/linux-study-clean/arch/mips/sgi-ip30/ip30-xtalk.c

File Facts

System
Linux kernel
Corpus path
arch/mips/sgi-ip30/ip30-xtalk.c
Extension
.c
Size
5125 bytes
Lines
187
Domain
Architecture Layer
Bucket
arch/mips
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/*
 * ip30-xtalk.c - Very basic Crosstalk (XIO) detection support.
 *   Copyright (C) 2004-2007 Stanislaw Skowronek <skylark@unaligned.org>
 *   Copyright (C) 2009 Johannes Dickgreber <tanzy@gmx.de>
 *   Copyright (C) 2007, 2014-2016 Joshua Kinard <linux@kumba.dev>
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/platform_data/sgi-w1.h>
#include <linux/platform_data/xtalk-bridge.h>

#include <asm/xtalk/xwidget.h>
#include <asm/pci/bridge.h>

#define IP30_SWIN_BASE(widget) \
		(0x0000000010000000 | (((unsigned long)(widget)) << 24))

#define IP30_RAW_SWIN_BASE(widget)	(IO_BASE + IP30_SWIN_BASE(widget))

#define IP30_SWIN_SIZE		(1 << 24)

#define IP30_WIDGET_XBOW        _AC(0x0, UL)    /* XBow is always 0 */
#define IP30_WIDGET_HEART       _AC(0x8, UL)    /* HEART is always 8 */
#define IP30_WIDGET_PCI_BASE    _AC(0xf, UL)    /* BaseIO PCI is always 15 */

#define XTALK_NODEV             0xffffffff

#define XBOW_REG_LINK_STAT_0    0x114
#define XBOW_REG_LINK_BLK_SIZE  0x40
#define XBOW_REG_LINK_ALIVE     0x80000000

#define HEART_INTR_ADDR		0x00000080

#define xtalk_read	__raw_readl

static void bridge_platform_create(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;

	wd = kzalloc_obj(*wd);
	if (!wd) {
		pr_warn("xtalk:%x bridge create out of memory\n", widget);
		return;
	}

	snprintf(wd->dev_id, sizeof(wd->dev_id), "bridge-%012lx",
		 IP30_SWIN_BASE(widget));

	memset(&w1_res, 0, sizeof(w1_res));
	w1_res.start = IP30_SWIN_BASE(widget) +
				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:%x bridge create out of memory\n", widget);
		goto err_kfree_wd;
	}
	if (platform_device_add_resources(pdev_wd, &w1_res, 1)) {
		pr_warn("xtalk:%x bridge failed to add platform resources.\n", widget);
		goto err_put_pdev_wd;
	}
	if (platform_device_add_data(pdev_wd, wd, sizeof(*wd))) {
		pr_warn("xtalk:%x bridge failed to add platform data.\n", widget);
		goto err_put_pdev_wd;
	}
	if (platform_device_add(pdev_wd)) {
		pr_warn("xtalk:%x bridge failed to add platform device.\n", widget);
		goto err_put_pdev_wd;
	}
	/* platform_device_add_data() duplicates the data */
	kfree(wd);

	bd = kzalloc_obj(*bd);
	if (!bd) {
		pr_warn("xtalk:%x bridge create out of memory\n", widget);
		goto err_unregister_pdev_wd;
	}
	pdev_bd = platform_device_alloc("xtalk-bridge", PLATFORM_DEVID_AUTO);
	if (!pdev_bd) {
		pr_warn("xtalk:%x bridge create out of memory\n", widget);
		goto err_kfree_bd;

Annotation

Implementation Notes