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![Rafał Miłecki](/assets/img/avatar_default.png)
Accessing struct device is pretty useful/common so having a direct pointer: 1) Simplifies some code 2) Makes bcma_bus_get_host_dev() unneeded 3) Allows further improvements like using dev_* printing helpers Signed-off-by: Rafał Miłecki <rafal@milecki.pl> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
698 lines
16 KiB
C
698 lines
16 KiB
C
/*
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* Broadcom specific AMBA
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* Bus subsystem
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*
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* Licensed under the GNU/GPL. See COPYING for details.
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*/
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#include "bcma_private.h"
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#include <linux/module.h>
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#include <linux/mmc/sdio_func.h>
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#include <linux/platform_device.h>
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#include <linux/pci.h>
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#include <linux/bcma/bcma.h>
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#include <linux/slab.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/of_platform.h>
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MODULE_DESCRIPTION("Broadcom's specific AMBA driver");
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MODULE_LICENSE("GPL");
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/* contains the number the next bus should get. */
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static unsigned int bcma_bus_next_num = 0;
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/* bcma_buses_mutex locks the bcma_bus_next_num */
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static DEFINE_MUTEX(bcma_buses_mutex);
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static int bcma_bus_match(struct device *dev, struct device_driver *drv);
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static int bcma_device_probe(struct device *dev);
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static int bcma_device_remove(struct device *dev);
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static int bcma_device_uevent(struct device *dev, struct kobj_uevent_env *env);
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static ssize_t manuf_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct bcma_device *core = container_of(dev, struct bcma_device, dev);
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return sprintf(buf, "0x%03X\n", core->id.manuf);
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}
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static DEVICE_ATTR_RO(manuf);
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static ssize_t id_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct bcma_device *core = container_of(dev, struct bcma_device, dev);
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return sprintf(buf, "0x%03X\n", core->id.id);
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}
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static DEVICE_ATTR_RO(id);
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static ssize_t rev_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct bcma_device *core = container_of(dev, struct bcma_device, dev);
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return sprintf(buf, "0x%02X\n", core->id.rev);
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}
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static DEVICE_ATTR_RO(rev);
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static ssize_t class_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct bcma_device *core = container_of(dev, struct bcma_device, dev);
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return sprintf(buf, "0x%X\n", core->id.class);
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}
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static DEVICE_ATTR_RO(class);
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static struct attribute *bcma_device_attrs[] = {
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&dev_attr_manuf.attr,
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&dev_attr_id.attr,
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&dev_attr_rev.attr,
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&dev_attr_class.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(bcma_device);
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static struct bus_type bcma_bus_type = {
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.name = "bcma",
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.match = bcma_bus_match,
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.probe = bcma_device_probe,
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.remove = bcma_device_remove,
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.uevent = bcma_device_uevent,
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.dev_groups = bcma_device_groups,
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};
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static u16 bcma_cc_core_id(struct bcma_bus *bus)
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{
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if (bus->chipinfo.id == BCMA_CHIP_ID_BCM4706)
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return BCMA_CORE_4706_CHIPCOMMON;
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return BCMA_CORE_CHIPCOMMON;
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}
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struct bcma_device *bcma_find_core_unit(struct bcma_bus *bus, u16 coreid,
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u8 unit)
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{
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struct bcma_device *core;
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list_for_each_entry(core, &bus->cores, list) {
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if (core->id.id == coreid && core->core_unit == unit)
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return core;
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(bcma_find_core_unit);
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bool bcma_wait_value(struct bcma_device *core, u16 reg, u32 mask, u32 value,
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int timeout)
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{
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unsigned long deadline = jiffies + timeout;
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u32 val;
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do {
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val = bcma_read32(core, reg);
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if ((val & mask) == value)
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return true;
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cpu_relax();
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udelay(10);
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} while (!time_after_eq(jiffies, deadline));
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bcma_warn(core->bus, "Timeout waiting for register 0x%04X!\n", reg);
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return false;
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}
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static void bcma_release_core_dev(struct device *dev)
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{
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struct bcma_device *core = container_of(dev, struct bcma_device, dev);
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if (core->io_addr)
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iounmap(core->io_addr);
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if (core->io_wrap)
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iounmap(core->io_wrap);
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kfree(core);
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}
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static bool bcma_is_core_needed_early(u16 core_id)
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{
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switch (core_id) {
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case BCMA_CORE_NS_NAND:
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case BCMA_CORE_NS_QSPI:
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return true;
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}
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return false;
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}
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static struct device_node *bcma_of_find_child_device(struct device *parent,
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struct bcma_device *core)
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{
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struct device_node *node;
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u64 size;
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const __be32 *reg;
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if (!parent->of_node)
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return NULL;
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for_each_child_of_node(parent->of_node, node) {
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reg = of_get_address(node, 0, &size, NULL);
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if (!reg)
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continue;
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if (of_translate_address(node, reg) == core->addr)
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return node;
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}
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return NULL;
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}
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static int bcma_of_irq_parse(struct device *parent,
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struct bcma_device *core,
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struct of_phandle_args *out_irq, int num)
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{
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__be32 laddr[1];
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int rc;
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if (core->dev.of_node) {
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rc = of_irq_parse_one(core->dev.of_node, num, out_irq);
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if (!rc)
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return rc;
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}
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out_irq->np = parent->of_node;
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out_irq->args_count = 1;
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out_irq->args[0] = num;
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laddr[0] = cpu_to_be32(core->addr);
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return of_irq_parse_raw(laddr, out_irq);
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}
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static unsigned int bcma_of_get_irq(struct device *parent,
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struct bcma_device *core, int num)
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{
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struct of_phandle_args out_irq;
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int ret;
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if (!IS_ENABLED(CONFIG_OF_IRQ) || !parent->of_node)
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return 0;
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ret = bcma_of_irq_parse(parent, core, &out_irq, num);
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if (ret) {
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bcma_debug(core->bus, "bcma_of_get_irq() failed with rc=%d\n",
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ret);
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return 0;
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}
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return irq_create_of_mapping(&out_irq);
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}
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static void bcma_of_fill_device(struct device *parent,
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struct bcma_device *core)
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{
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struct device_node *node;
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node = bcma_of_find_child_device(parent, core);
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if (node)
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core->dev.of_node = node;
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core->irq = bcma_of_get_irq(parent, core, 0);
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of_dma_configure(&core->dev, node, false);
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}
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unsigned int bcma_core_irq(struct bcma_device *core, int num)
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{
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struct bcma_bus *bus = core->bus;
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unsigned int mips_irq;
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switch (bus->hosttype) {
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case BCMA_HOSTTYPE_PCI:
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return bus->host_pci->irq;
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case BCMA_HOSTTYPE_SOC:
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if (bus->drv_mips.core && num == 0) {
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mips_irq = bcma_core_mips_irq(core);
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return mips_irq <= 4 ? mips_irq + 2 : 0;
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}
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if (bus->dev)
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return bcma_of_get_irq(bus->dev, core, num);
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return 0;
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case BCMA_HOSTTYPE_SDIO:
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return 0;
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}
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return 0;
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}
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EXPORT_SYMBOL(bcma_core_irq);
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void bcma_prepare_core(struct bcma_bus *bus, struct bcma_device *core)
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{
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core->dev.release = bcma_release_core_dev;
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core->dev.bus = &bcma_bus_type;
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dev_set_name(&core->dev, "bcma%d:%d", bus->num, core->core_index);
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core->dev.parent = bus->dev;
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if (bus->dev)
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bcma_of_fill_device(bus->dev, core);
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switch (bus->hosttype) {
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case BCMA_HOSTTYPE_PCI:
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core->dma_dev = bus->dev;
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core->irq = bus->host_pci->irq;
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break;
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case BCMA_HOSTTYPE_SOC:
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if (IS_ENABLED(CONFIG_OF) && bus->dev) {
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core->dma_dev = bus->dev;
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} else {
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core->dev.dma_mask = &core->dev.coherent_dma_mask;
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core->dma_dev = &core->dev;
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}
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break;
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case BCMA_HOSTTYPE_SDIO:
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break;
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}
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}
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void bcma_init_bus(struct bcma_bus *bus)
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{
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mutex_lock(&bcma_buses_mutex);
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bus->num = bcma_bus_next_num++;
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mutex_unlock(&bcma_buses_mutex);
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INIT_LIST_HEAD(&bus->cores);
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bus->nr_cores = 0;
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bcma_detect_chip(bus);
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}
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static void bcma_register_core(struct bcma_bus *bus, struct bcma_device *core)
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{
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int err;
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err = device_register(&core->dev);
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if (err) {
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bcma_err(bus, "Could not register dev for core 0x%03X\n",
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core->id.id);
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put_device(&core->dev);
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return;
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}
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core->dev_registered = true;
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}
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static int bcma_register_devices(struct bcma_bus *bus)
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{
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struct bcma_device *core;
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int err;
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list_for_each_entry(core, &bus->cores, list) {
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/* We support that cores ourself */
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switch (core->id.id) {
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case BCMA_CORE_4706_CHIPCOMMON:
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case BCMA_CORE_CHIPCOMMON:
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case BCMA_CORE_NS_CHIPCOMMON_B:
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case BCMA_CORE_PCI:
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case BCMA_CORE_PCIE:
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case BCMA_CORE_PCIE2:
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case BCMA_CORE_MIPS_74K:
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case BCMA_CORE_4706_MAC_GBIT_COMMON:
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continue;
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}
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/* Early cores were already registered */
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if (bcma_is_core_needed_early(core->id.id))
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continue;
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/* Only first GMAC core on BCM4706 is connected and working */
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if (core->id.id == BCMA_CORE_4706_MAC_GBIT &&
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core->core_unit > 0)
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continue;
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bcma_register_core(bus, core);
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}
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#ifdef CONFIG_BCMA_PFLASH
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if (bus->drv_cc.pflash.present) {
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err = platform_device_register(&bcma_pflash_dev);
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if (err)
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bcma_err(bus, "Error registering parallel flash\n");
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}
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#endif
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#ifdef CONFIG_BCMA_SFLASH
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if (bus->drv_cc.sflash.present) {
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err = platform_device_register(&bcma_sflash_dev);
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if (err)
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bcma_err(bus, "Error registering serial flash\n");
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}
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#endif
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#ifdef CONFIG_BCMA_NFLASH
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if (bus->drv_cc.nflash.present) {
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err = platform_device_register(&bcma_nflash_dev);
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if (err)
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bcma_err(bus, "Error registering NAND flash\n");
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}
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#endif
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err = bcma_gpio_init(&bus->drv_cc);
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if (err == -ENOTSUPP)
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bcma_debug(bus, "GPIO driver not activated\n");
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else if (err)
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bcma_err(bus, "Error registering GPIO driver: %i\n", err);
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if (bus->hosttype == BCMA_HOSTTYPE_SOC) {
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err = bcma_chipco_watchdog_register(&bus->drv_cc);
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if (err)
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bcma_err(bus, "Error registering watchdog driver\n");
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}
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return 0;
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}
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void bcma_unregister_cores(struct bcma_bus *bus)
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{
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struct bcma_device *core, *tmp;
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list_for_each_entry_safe(core, tmp, &bus->cores, list) {
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if (!core->dev_registered)
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continue;
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list_del(&core->list);
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device_unregister(&core->dev);
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}
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if (bus->hosttype == BCMA_HOSTTYPE_SOC)
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platform_device_unregister(bus->drv_cc.watchdog);
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/* Now noone uses internally-handled cores, we can free them */
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list_for_each_entry_safe(core, tmp, &bus->cores, list) {
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list_del(&core->list);
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kfree(core);
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}
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}
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int bcma_bus_register(struct bcma_bus *bus)
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{
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int err;
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struct bcma_device *core;
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/* Scan for devices (cores) */
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err = bcma_bus_scan(bus);
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if (err) {
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bcma_err(bus, "Failed to scan: %d\n", err);
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return err;
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}
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/* Early init CC core */
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core = bcma_find_core(bus, bcma_cc_core_id(bus));
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if (core) {
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bus->drv_cc.core = core;
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bcma_core_chipcommon_early_init(&bus->drv_cc);
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}
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/* Early init PCIE core */
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core = bcma_find_core(bus, BCMA_CORE_PCIE);
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if (core) {
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bus->drv_pci[0].core = core;
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bcma_core_pci_early_init(&bus->drv_pci[0]);
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}
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if (bus->dev)
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of_platform_default_populate(bus->dev->of_node, NULL, bus->dev);
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/* Cores providing flash access go before SPROM init */
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list_for_each_entry(core, &bus->cores, list) {
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if (bcma_is_core_needed_early(core->id.id))
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bcma_register_core(bus, core);
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}
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/* Try to get SPROM */
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err = bcma_sprom_get(bus);
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if (err == -ENOENT) {
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bcma_err(bus, "No SPROM available\n");
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} else if (err)
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bcma_err(bus, "Failed to get SPROM: %d\n", err);
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/* Init CC core */
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core = bcma_find_core(bus, bcma_cc_core_id(bus));
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if (core) {
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bus->drv_cc.core = core;
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bcma_core_chipcommon_init(&bus->drv_cc);
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}
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/* Init CC core */
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core = bcma_find_core(bus, BCMA_CORE_NS_CHIPCOMMON_B);
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if (core) {
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bus->drv_cc_b.core = core;
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bcma_core_chipcommon_b_init(&bus->drv_cc_b);
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}
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/* Init MIPS core */
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core = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
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if (core) {
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bus->drv_mips.core = core;
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bcma_core_mips_init(&bus->drv_mips);
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}
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/* Init PCIE core */
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core = bcma_find_core_unit(bus, BCMA_CORE_PCIE, 0);
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if (core) {
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bus->drv_pci[0].core = core;
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bcma_core_pci_init(&bus->drv_pci[0]);
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}
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/* Init PCIE core */
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core = bcma_find_core_unit(bus, BCMA_CORE_PCIE, 1);
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if (core) {
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bus->drv_pci[1].core = core;
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bcma_core_pci_init(&bus->drv_pci[1]);
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}
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/* Init PCIe Gen 2 core */
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core = bcma_find_core_unit(bus, BCMA_CORE_PCIE2, 0);
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if (core) {
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bus->drv_pcie2.core = core;
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bcma_core_pcie2_init(&bus->drv_pcie2);
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}
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/* Init GBIT MAC COMMON core */
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core = bcma_find_core(bus, BCMA_CORE_4706_MAC_GBIT_COMMON);
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if (core) {
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bus->drv_gmac_cmn.core = core;
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bcma_core_gmac_cmn_init(&bus->drv_gmac_cmn);
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}
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/* Register found cores */
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bcma_register_devices(bus);
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bcma_info(bus, "Bus registered\n");
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return 0;
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}
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void bcma_bus_unregister(struct bcma_bus *bus)
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{
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int err;
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err = bcma_gpio_unregister(&bus->drv_cc);
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if (err == -EBUSY)
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bcma_err(bus, "Some GPIOs are still in use.\n");
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else if (err)
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bcma_err(bus, "Can not unregister GPIO driver: %i\n", err);
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bcma_core_chipcommon_b_free(&bus->drv_cc_b);
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bcma_unregister_cores(bus);
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}
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/*
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* This is a special version of bus registration function designed for SoCs.
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* It scans bus and performs basic initialization of main cores only.
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* Please note it requires memory allocation, however it won't try to sleep.
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*/
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int __init bcma_bus_early_register(struct bcma_bus *bus)
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{
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int err;
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struct bcma_device *core;
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/* Scan for devices (cores) */
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err = bcma_bus_scan(bus);
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if (err) {
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bcma_err(bus, "Failed to scan bus: %d\n", err);
|
|
return -1;
|
|
}
|
|
|
|
/* Early init CC core */
|
|
core = bcma_find_core(bus, bcma_cc_core_id(bus));
|
|
if (core) {
|
|
bus->drv_cc.core = core;
|
|
bcma_core_chipcommon_early_init(&bus->drv_cc);
|
|
}
|
|
|
|
/* Early init MIPS core */
|
|
core = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
|
|
if (core) {
|
|
bus->drv_mips.core = core;
|
|
bcma_core_mips_early_init(&bus->drv_mips);
|
|
}
|
|
|
|
bcma_info(bus, "Early bus registered\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
int bcma_bus_suspend(struct bcma_bus *bus)
|
|
{
|
|
struct bcma_device *core;
|
|
|
|
list_for_each_entry(core, &bus->cores, list) {
|
|
struct device_driver *drv = core->dev.driver;
|
|
if (drv) {
|
|
struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
|
|
if (adrv->suspend)
|
|
adrv->suspend(core);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int bcma_bus_resume(struct bcma_bus *bus)
|
|
{
|
|
struct bcma_device *core;
|
|
|
|
/* Init CC core */
|
|
if (bus->drv_cc.core) {
|
|
bus->drv_cc.setup_done = false;
|
|
bcma_core_chipcommon_init(&bus->drv_cc);
|
|
}
|
|
|
|
list_for_each_entry(core, &bus->cores, list) {
|
|
struct device_driver *drv = core->dev.driver;
|
|
if (drv) {
|
|
struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
|
|
if (adrv->resume)
|
|
adrv->resume(core);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
int __bcma_driver_register(struct bcma_driver *drv, struct module *owner)
|
|
{
|
|
drv->drv.name = drv->name;
|
|
drv->drv.bus = &bcma_bus_type;
|
|
drv->drv.owner = owner;
|
|
|
|
return driver_register(&drv->drv);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__bcma_driver_register);
|
|
|
|
void bcma_driver_unregister(struct bcma_driver *drv)
|
|
{
|
|
driver_unregister(&drv->drv);
|
|
}
|
|
EXPORT_SYMBOL_GPL(bcma_driver_unregister);
|
|
|
|
static int bcma_bus_match(struct device *dev, struct device_driver *drv)
|
|
{
|
|
struct bcma_device *core = container_of(dev, struct bcma_device, dev);
|
|
struct bcma_driver *adrv = container_of(drv, struct bcma_driver, drv);
|
|
const struct bcma_device_id *cid = &core->id;
|
|
const struct bcma_device_id *did;
|
|
|
|
for (did = adrv->id_table; did->manuf || did->id || did->rev; did++) {
|
|
if ((did->manuf == cid->manuf || did->manuf == BCMA_ANY_MANUF) &&
|
|
(did->id == cid->id || did->id == BCMA_ANY_ID) &&
|
|
(did->rev == cid->rev || did->rev == BCMA_ANY_REV) &&
|
|
(did->class == cid->class || did->class == BCMA_ANY_CLASS))
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int bcma_device_probe(struct device *dev)
|
|
{
|
|
struct bcma_device *core = container_of(dev, struct bcma_device, dev);
|
|
struct bcma_driver *adrv = container_of(dev->driver, struct bcma_driver,
|
|
drv);
|
|
int err = 0;
|
|
|
|
get_device(dev);
|
|
if (adrv->probe)
|
|
err = adrv->probe(core);
|
|
if (err)
|
|
put_device(dev);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int bcma_device_remove(struct device *dev)
|
|
{
|
|
struct bcma_device *core = container_of(dev, struct bcma_device, dev);
|
|
struct bcma_driver *adrv = container_of(dev->driver, struct bcma_driver,
|
|
drv);
|
|
|
|
if (adrv->remove)
|
|
adrv->remove(core);
|
|
put_device(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bcma_device_uevent(struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
struct bcma_device *core = container_of(dev, struct bcma_device, dev);
|
|
|
|
return add_uevent_var(env,
|
|
"MODALIAS=bcma:m%04Xid%04Xrev%02Xcl%02X",
|
|
core->id.manuf, core->id.id,
|
|
core->id.rev, core->id.class);
|
|
}
|
|
|
|
static unsigned int bcma_bus_registered;
|
|
|
|
/*
|
|
* If built-in, bus has to be registered early, before any driver calls
|
|
* bcma_driver_register.
|
|
* Otherwise registering driver would trigger BUG in driver_register.
|
|
*/
|
|
static int __init bcma_init_bus_register(void)
|
|
{
|
|
int err;
|
|
|
|
if (bcma_bus_registered)
|
|
return 0;
|
|
|
|
err = bus_register(&bcma_bus_type);
|
|
if (!err)
|
|
bcma_bus_registered = 1;
|
|
|
|
return err;
|
|
}
|
|
#ifndef MODULE
|
|
fs_initcall(bcma_init_bus_register);
|
|
#endif
|
|
|
|
/* Main initialization has to be done with SPI/mtd/NAND/SPROM available */
|
|
static int __init bcma_modinit(void)
|
|
{
|
|
int err;
|
|
|
|
err = bcma_init_bus_register();
|
|
if (err)
|
|
return err;
|
|
|
|
err = bcma_host_soc_register_driver();
|
|
if (err) {
|
|
pr_err("SoC host initialization failed\n");
|
|
err = 0;
|
|
}
|
|
#ifdef CONFIG_BCMA_HOST_PCI
|
|
err = bcma_host_pci_init();
|
|
if (err) {
|
|
pr_err("PCI host initialization failed\n");
|
|
err = 0;
|
|
}
|
|
#endif
|
|
|
|
return err;
|
|
}
|
|
module_init(bcma_modinit);
|
|
|
|
static void __exit bcma_modexit(void)
|
|
{
|
|
#ifdef CONFIG_BCMA_HOST_PCI
|
|
bcma_host_pci_exit();
|
|
#endif
|
|
bcma_host_soc_unregister_driver();
|
|
bus_unregister(&bcma_bus_type);
|
|
}
|
|
module_exit(bcma_modexit)
|