Busses
======
-SuperHyway
-----------
-
-.. kernel-doc:: drivers/sh/superhyway/superhyway.c
- :export:
-
Maple
-----
menu "Bus options"
-config SUPERHYWAY
- tristate "SuperHyway Bus support"
- depends on CPU_SUBTYPE_SH4_202
-
config MAPLE
bool "Maple Bus support"
depends on SH_DREAMCAST
obj-y += dma/ platform_early.o
obj-$(CONFIG_PCI) += pci/
-obj-$(CONFIG_SUPERHYWAY) += superhyway/
obj-$(CONFIG_PUSH_SWITCH) += push-switch.o
obj-$(CONFIG_HEARTBEAT) += heartbeat.o
+++ /dev/null
-# SPDX-License-Identifier: GPL-2.0
-#
-# Makefile for the SuperHyway specific kernel interface routines under Linux.
-#
-
-obj-$(CONFIG_CPU_SUBTYPE_SH4_202) += ops-sh4-202.o
-
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * arch/sh/drivers/superhyway/ops-sh4-202.c
- *
- * SuperHyway bus support for SH4-202
- *
- * Copyright (C) 2005 Paul Mundt
- */
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/superhyway.h>
-#include <linux/string.h>
-#include <asm/addrspace.h>
-#include <asm/io.h>
-
-#define PHYS_EMI_CBLOCK P4SEGADDR(0x1ec00000)
-#define PHYS_EMI_DBLOCK P4SEGADDR(0x08000000)
-#define PHYS_FEMI_CBLOCK P4SEGADDR(0x1f800000)
-#define PHYS_FEMI_DBLOCK P4SEGADDR(0x00000000)
-
-#define PHYS_EPBR_BLOCK P4SEGADDR(0x1de00000)
-#define PHYS_DMAC_BLOCK P4SEGADDR(0x1fa00000)
-#define PHYS_PBR_BLOCK P4SEGADDR(0x1fc00000)
-
-static struct resource emi_resources[] = {
- [0] = {
- .start = PHYS_EMI_CBLOCK,
- .end = PHYS_EMI_CBLOCK + 0x00300000 - 1,
- .flags = IORESOURCE_MEM,
- },
- [1] = {
- .start = PHYS_EMI_DBLOCK,
- .end = PHYS_EMI_DBLOCK + 0x08000000 - 1,
- .flags = IORESOURCE_MEM,
- },
-};
-
-static struct superhyway_device emi_device = {
- .name = "emi",
- .num_resources = ARRAY_SIZE(emi_resources),
- .resource = emi_resources,
-};
-
-static struct resource femi_resources[] = {
- [0] = {
- .start = PHYS_FEMI_CBLOCK,
- .end = PHYS_FEMI_CBLOCK + 0x00100000 - 1,
- .flags = IORESOURCE_MEM,
- },
- [1] = {
- .start = PHYS_FEMI_DBLOCK,
- .end = PHYS_FEMI_DBLOCK + 0x08000000 - 1,
- .flags = IORESOURCE_MEM,
- },
-};
-
-static struct superhyway_device femi_device = {
- .name = "femi",
- .num_resources = ARRAY_SIZE(femi_resources),
- .resource = femi_resources,
-};
-
-static struct resource epbr_resources[] = {
- [0] = {
- .start = P4SEGADDR(0x1e7ffff8),
- .end = P4SEGADDR(0x1e7ffff8 + (sizeof(u32) * 2) - 1),
- .flags = IORESOURCE_MEM,
- },
- [1] = {
- .start = PHYS_EPBR_BLOCK,
- .end = PHYS_EPBR_BLOCK + 0x00a00000 - 1,
- .flags = IORESOURCE_MEM,
- },
-};
-
-static struct superhyway_device epbr_device = {
- .name = "epbr",
- .num_resources = ARRAY_SIZE(epbr_resources),
- .resource = epbr_resources,
-};
-
-static struct resource dmac_resource = {
- .start = PHYS_DMAC_BLOCK,
- .end = PHYS_DMAC_BLOCK + 0x00100000 - 1,
- .flags = IORESOURCE_MEM,
-};
-
-static struct superhyway_device dmac_device = {
- .name = "dmac",
- .num_resources = 1,
- .resource = &dmac_resource,
-};
-
-static struct resource pbr_resources[] = {
- [0] = {
- .start = P4SEGADDR(0x1ffffff8),
- .end = P4SEGADDR(0x1ffffff8 + (sizeof(u32) * 2) - 1),
- .flags = IORESOURCE_MEM,
- },
- [1] = {
- .start = PHYS_PBR_BLOCK,
- .end = PHYS_PBR_BLOCK + 0x00400000 - (sizeof(u32) * 2) - 1,
- .flags = IORESOURCE_MEM,
- },
-};
-
-static struct superhyway_device pbr_device = {
- .name = "pbr",
- .num_resources = ARRAY_SIZE(pbr_resources),
- .resource = pbr_resources,
-};
-
-static struct superhyway_device *sh4202_devices[] __initdata = {
- &emi_device, &femi_device, &epbr_device, &dmac_device, &pbr_device,
-};
-
-static int sh4202_read_vcr(unsigned long base, struct superhyway_vcr_info *vcr)
-{
- u32 vcrh, vcrl;
- u64 tmp;
-
- /*
- * XXX: Even though the SH4-202 Evaluation Device documentation
- * indicates that VCRL is mapped first with VCRH at a + 0x04
- * offset, the opposite seems to be true.
- *
- * Some modules (PBR and ePBR for instance) also appear to have
- * VCRL/VCRH flipped in the documentation, but on the SH4-202
- * itself it appears that these are all consistently mapped with
- * VCRH preceding VCRL.
- *
- * Do not trust the documentation, for it is evil.
- */
- vcrh = __raw_readl(base);
- vcrl = __raw_readl(base + sizeof(u32));
-
- tmp = ((u64)vcrh << 32) | vcrl;
- memcpy(vcr, &tmp, sizeof(u64));
-
- return 0;
-}
-
-static int sh4202_write_vcr(unsigned long base, struct superhyway_vcr_info vcr)
-{
- u64 tmp = *(u64 *)&vcr;
-
- __raw_writel((tmp >> 32) & 0xffffffff, base);
- __raw_writel(tmp & 0xffffffff, base + sizeof(u32));
-
- return 0;
-}
-
-static struct superhyway_ops sh4202_superhyway_ops = {
- .read_vcr = sh4202_read_vcr,
- .write_vcr = sh4202_write_vcr,
-};
-
-struct superhyway_bus superhyway_channels[] = {
- { &sh4202_superhyway_ops, },
- { 0, },
-};
-
-int __init superhyway_scan_bus(struct superhyway_bus *bus)
-{
- return superhyway_add_devices(bus, sh4202_devices,
- ARRAY_SIZE(sh4202_devices));
-}
-
obj-$(CONFIG_HAVE_CLK) += clk/
endif
obj-$(CONFIG_MAPLE) += maple/
-obj-$(CONFIG_SUPERHYWAY) += superhyway/
obj-y += pm_runtime.o
+++ /dev/null
-# SPDX-License-Identifier: GPL-2.0-only
-#
-# Makefile for the SuperHyway bus drivers.
-#
-
-obj-$(CONFIG_SUPERHYWAY) += superhyway.o
-obj-$(CONFIG_SYSFS) += superhyway-sysfs.o
-
+++ /dev/null
-/*
- * drivers/sh/superhyway/superhyway-sysfs.c
- *
- * SuperHyway Bus sysfs interface
- *
- * Copyright (C) 2004, 2005 Paul Mundt <lethal@linux-sh.org>
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- */
-#include <linux/kernel.h>
-#include <linux/device.h>
-#include <linux/types.h>
-#include <linux/superhyway.h>
-
-#define superhyway_ro_attr(name, fmt, field) \
-static ssize_t name##_show(struct device *dev, struct device_attribute *attr, char *buf) \
-{ \
- struct superhyway_device *s = to_superhyway_device(dev); \
- return sprintf(buf, fmt, s->field); \
-} \
-static DEVICE_ATTR_RO(name);
-
-/* VCR flags */
-superhyway_ro_attr(perr_flags, "0x%02x\n", vcr.perr_flags);
-superhyway_ro_attr(merr_flags, "0x%02x\n", vcr.merr_flags);
-superhyway_ro_attr(mod_vers, "0x%04x\n", vcr.mod_vers);
-superhyway_ro_attr(mod_id, "0x%04x\n", vcr.mod_id);
-superhyway_ro_attr(bot_mb, "0x%02x\n", vcr.bot_mb);
-superhyway_ro_attr(top_mb, "0x%02x\n", vcr.top_mb);
-
-/* Misc */
-superhyway_ro_attr(resource, "0x%08lx\n", resource[0].start);
-
-static struct attribute *superhyway_dev_attrs[] = {
- &dev_attr_perr_flags.attr,
- &dev_attr_merr_flags.attr,
- &dev_attr_mod_vers.attr,
- &dev_attr_mod_id.attr,
- &dev_attr_bot_mb.attr,
- &dev_attr_top_mb.attr,
- &dev_attr_resource.attr,
- NULL,
-};
-
-static const struct attribute_group superhyway_dev_group = {
- .attrs = superhyway_dev_attrs,
-};
-
-const struct attribute_group *superhyway_dev_groups[] = {
- &superhyway_dev_group,
- NULL,
-};
+++ /dev/null
-/*
- * drivers/sh/superhyway/superhyway.c
- *
- * SuperHyway Bus Driver
- *
- * Copyright (C) 2004, 2005 Paul Mundt <lethal@linux-sh.org>
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- */
-#include <linux/kernel.h>
-#include <linux/device.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/list.h>
-#include <linux/superhyway.h>
-#include <linux/string.h>
-#include <linux/slab.h>
-
-static int superhyway_devices;
-
-static struct device superhyway_bus_device = {
- .init_name = "superhyway",
-};
-
-static void superhyway_device_release(struct device *dev)
-{
- struct superhyway_device *sdev = to_superhyway_device(dev);
-
- kfree(sdev->resource);
- kfree(sdev);
-}
-
-/**
- * superhyway_add_device - Add a SuperHyway module
- * @base: Physical address where module is mapped.
- * @sdev: SuperHyway device to add, or NULL to allocate a new one.
- * @bus: Bus where SuperHyway module resides.
- *
- * This is responsible for adding a new SuperHyway module. This sets up a new
- * struct superhyway_device for the module being added if @sdev == NULL.
- *
- * Devices are initially added in the order that they are scanned (from the
- * top-down of the memory map), and are assigned an ID based on the order that
- * they are added. Any manual addition of a module will thus get the ID after
- * the devices already discovered regardless of where it resides in memory.
- *
- * Further work can and should be done in superhyway_scan_bus(), to be sure
- * that any new modules are properly discovered and subsequently registered.
- */
-int superhyway_add_device(unsigned long base, struct superhyway_device *sdev,
- struct superhyway_bus *bus)
-{
- struct superhyway_device *dev = sdev;
-
- if (!dev) {
- dev = kzalloc(sizeof(struct superhyway_device), GFP_KERNEL);
- if (!dev)
- return -ENOMEM;
-
- }
-
- dev->bus = bus;
- superhyway_read_vcr(dev, base, &dev->vcr);
-
- if (!dev->resource) {
- dev->resource = kzalloc(sizeof(struct resource), GFP_KERNEL);
- if (!dev->resource) {
- kfree(dev);
- return -ENOMEM;
- }
-
- dev->resource->name = dev->name;
- dev->resource->start = base;
- dev->resource->end = dev->resource->start + 0x01000000;
- }
-
- dev->dev.parent = &superhyway_bus_device;
- dev->dev.bus = &superhyway_bus_type;
- dev->dev.release = superhyway_device_release;
- dev->id.id = dev->vcr.mod_id;
-
- sprintf(dev->name, "SuperHyway device %04x", dev->id.id);
- dev_set_name(&dev->dev, "%02x", superhyway_devices);
-
- superhyway_devices++;
-
- return device_register(&dev->dev);
-}
-
-int superhyway_add_devices(struct superhyway_bus *bus,
- struct superhyway_device **devices,
- int nr_devices)
-{
- int i, ret = 0;
-
- for (i = 0; i < nr_devices; i++) {
- struct superhyway_device *dev = devices[i];
- ret |= superhyway_add_device(dev->resource[0].start, dev, bus);
- }
-
- return ret;
-}
-
-static int __init superhyway_init(void)
-{
- struct superhyway_bus *bus;
- int ret;
-
- ret = device_register(&superhyway_bus_device);
- if (unlikely(ret))
- return ret;
-
- for (bus = superhyway_channels; bus->ops; bus++)
- ret |= superhyway_scan_bus(bus);
-
- return ret;
-}
-postcore_initcall(superhyway_init);
-
-static const struct superhyway_device_id *
-superhyway_match_id(const struct superhyway_device_id *ids,
- struct superhyway_device *dev)
-{
- while (ids->id) {
- if (ids->id == dev->id.id)
- return ids;
-
- ids++;
- }
-
- return NULL;
-}
-
-static int superhyway_device_probe(struct device *dev)
-{
- struct superhyway_device *shyway_dev = to_superhyway_device(dev);
- struct superhyway_driver *shyway_drv = to_superhyway_driver(dev->driver);
-
- if (shyway_drv && shyway_drv->probe) {
- const struct superhyway_device_id *id;
-
- id = superhyway_match_id(shyway_drv->id_table, shyway_dev);
- if (id)
- return shyway_drv->probe(shyway_dev, id);
- }
-
- return -ENODEV;
-}
-
-static void superhyway_device_remove(struct device *dev)
-{
- struct superhyway_device *shyway_dev = to_superhyway_device(dev);
- struct superhyway_driver *shyway_drv = to_superhyway_driver(dev->driver);
-
- if (shyway_drv->remove)
- shyway_drv->remove(shyway_dev);
-}
-
-/**
- * superhyway_register_driver - Register a new SuperHyway driver
- * @drv: SuperHyway driver to register.
- *
- * This registers the passed in @drv. Any devices matching the id table will
- * automatically be populated and handed off to the driver's specified probe
- * routine.
- */
-int superhyway_register_driver(struct superhyway_driver *drv)
-{
- drv->drv.name = drv->name;
- drv->drv.bus = &superhyway_bus_type;
-
- return driver_register(&drv->drv);
-}
-
-/**
- * superhyway_unregister_driver - Unregister a SuperHyway driver
- * @drv: SuperHyway driver to unregister.
- *
- * This cleans up after superhyway_register_driver(), and should be invoked in
- * the exit path of any module drivers.
- */
-void superhyway_unregister_driver(struct superhyway_driver *drv)
-{
- driver_unregister(&drv->drv);
-}
-
-static int superhyway_bus_match(struct device *dev, struct device_driver *drv)
-{
- struct superhyway_device *shyway_dev = to_superhyway_device(dev);
- struct superhyway_driver *shyway_drv = to_superhyway_driver(drv);
- const struct superhyway_device_id *ids = shyway_drv->id_table;
-
- if (!ids)
- return -EINVAL;
- if (superhyway_match_id(ids, shyway_dev))
- return 1;
-
- return -ENODEV;
-}
-
-struct bus_type superhyway_bus_type = {
- .name = "superhyway",
- .match = superhyway_bus_match,
-#ifdef CONFIG_SYSFS
- .dev_groups = superhyway_dev_groups,
-#endif
- .probe = superhyway_device_probe,
- .remove = superhyway_device_remove,
-};
-
-static int __init superhyway_bus_init(void)
-{
- return bus_register(&superhyway_bus_type);
-}
-
-static void __exit superhyway_bus_exit(void)
-{
- device_unregister(&superhyway_bus_device);
- bus_unregister(&superhyway_bus_type);
-}
-
-core_initcall(superhyway_bus_init);
-module_exit(superhyway_bus_exit);
-
-EXPORT_SYMBOL(superhyway_bus_type);
-EXPORT_SYMBOL(superhyway_add_device);
-EXPORT_SYMBOL(superhyway_add_devices);
-EXPORT_SYMBOL(superhyway_register_driver);
-EXPORT_SYMBOL(superhyway_unregister_driver);
-
-MODULE_LICENSE("GPL");
+++ /dev/null
-/*
- * include/linux/superhyway.h
- *
- * SuperHyway Bus definitions
- *
- * Copyright (C) 2004, 2005 Paul Mundt <lethal@linux-sh.org>
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- */
-#ifndef __LINUX_SUPERHYWAY_H
-#define __LINUX_SUPERHYWAY_H
-
-#include <linux/device.h>
-
-/*
- * SuperHyway IDs
- */
-#define SUPERHYWAY_DEVICE_ID_SH5_DMAC 0x0183
-
-struct superhyway_vcr_info {
- u8 perr_flags; /* P-port Error flags */
- u8 merr_flags; /* Module Error flags */
- u16 mod_vers; /* Module Version */
- u16 mod_id; /* Module ID */
- u8 bot_mb; /* Bottom Memory block */
- u8 top_mb; /* Top Memory block */
-};
-
-struct superhyway_ops {
- int (*read_vcr)(unsigned long base, struct superhyway_vcr_info *vcr);
- int (*write_vcr)(unsigned long base, struct superhyway_vcr_info vcr);
-};
-
-struct superhyway_bus {
- struct superhyway_ops *ops;
-};
-
-extern struct superhyway_bus superhyway_channels[];
-
-struct superhyway_device_id {
- unsigned int id;
- unsigned long driver_data;
-};
-
-struct superhyway_device;
-extern struct bus_type superhyway_bus_type;
-
-struct superhyway_driver {
- char *name;
-
- const struct superhyway_device_id *id_table;
- struct device_driver drv;
-
- int (*probe)(struct superhyway_device *dev, const struct superhyway_device_id *id);
- void (*remove)(struct superhyway_device *dev);
-};
-
-#define to_superhyway_driver(d) container_of((d), struct superhyway_driver, drv)
-
-struct superhyway_device {
- char name[32];
-
- struct device dev;
-
- struct superhyway_device_id id;
- struct superhyway_driver *drv;
- struct superhyway_bus *bus;
-
- int num_resources;
- struct resource *resource;
- struct superhyway_vcr_info vcr;
-};
-
-#define to_superhyway_device(d) container_of((d), struct superhyway_device, dev)
-
-#define superhyway_get_drvdata(d) dev_get_drvdata(&(d)->dev)
-#define superhyway_set_drvdata(d,p) dev_set_drvdata(&(d)->dev, (p))
-
-static inline int
-superhyway_read_vcr(struct superhyway_device *dev, unsigned long base,
- struct superhyway_vcr_info *vcr)
-{
- return dev->bus->ops->read_vcr(base, vcr);
-}
-
-static inline int
-superhyway_write_vcr(struct superhyway_device *dev, unsigned long base,
- struct superhyway_vcr_info vcr)
-{
- return dev->bus->ops->write_vcr(base, vcr);
-}
-
-extern int superhyway_scan_bus(struct superhyway_bus *);
-
-/* drivers/sh/superhyway/superhyway.c */
-int superhyway_register_driver(struct superhyway_driver *);
-void superhyway_unregister_driver(struct superhyway_driver *);
-int superhyway_add_device(unsigned long base, struct superhyway_device *, struct superhyway_bus *);
-int superhyway_add_devices(struct superhyway_bus *bus, struct superhyway_device **devices, int nr_devices);
-
-/* drivers/sh/superhyway/superhyway-sysfs.c */
-extern const struct attribute_group *superhyway_dev_groups[];
-
-#endif /* __LINUX_SUPERHYWAY_H */
-
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