//drivers/net/gianfar.c
static int gfar_parse_group(struct device_node *np,
struct gfar_private *priv, const char *model)
{
u32 *queue_mask;
#ifdef CONFIG_GFAR_SW_PKT_STEERING
int i;
int cpus = num_online_cpus();
#endif
priv->gfargrp[priv->num_grps].regs = of_iomap(np, 0);
if (!priv->gfargrp[priv->num_grps].regs)
return -ENOMEM;
priv->gfargrp[priv->num_grps].interruptTransmit =
irq_of_parse_and_map(np, 0);//解释与映射发送中断
/* If we aren't the FEC we have multiple interrupts */
if (model && strcasecmp(model, "FEC")) {
priv->gfargrp[priv->num_grps].interruptReceive =
irq_of_parse_and_map(np, 1);
priv->gfargrp[priv->num_grps].interruptError =
irq_of_parse_and_map(np,2);
if (priv->gfargrp[priv->num_grps].interruptTransmit < 0 ||
priv->gfargrp[priv->num_grps].interruptReceive < 0 ||
priv->gfargrp[priv->num_grps].interruptError < 0) {
return -EINVAL;
}
}
priv->gfargrp[priv->num_grps].grp_id = priv->num_grps;
priv->gfargrp[priv->num_grps].priv = priv;
spin_lock_init(&priv->gfargrp[priv->num_grps].grplock);
if(priv->mode == MQ_MG_MODE) {
queue_mask = (u32 *)of_get_property(np,
"rx-bit-map", NULL);
priv->gfargrp[priv->num_grps].rx_bit_map =
queue_mask ? *queue_mask :(DEFAULT_MAPPING >> priv->num_grps);
queue_mask = (u32 *)of_get_property(np,
"tx-bit-map", NULL);
priv->gfargrp[priv->num_grps].tx_bit_map =
queue_mask ? *queue_mask : (DEFAULT_MAPPING >> priv->num_grps);
} else {
priv->gfargrp[priv->num_grps].rx_bit_map = 0xFF;
priv->gfargrp[priv->num_grps].tx_bit_map = 0xFF;
}
#ifdef CONFIG_GFAR_SW_PKT_STEERING
if (priv->sps) {
/* register msg unit for virtual tx interrupt for each cpu */
for (i = 0; i < cpus; i++) { /* for each cpu */
priv->gfargrp[priv->num_grps].msg_virtual_tx[i]
= fsl_get_msg_unit();
if (IS_ERR
(priv->gfargrp[priv->num_grps].msg_virtual_tx[i])) {
priv->sps = 0;
printk(KERN_WARNING
"%s: unable to allocate msg interrupt for pkt"
"steering, error = %ld!\n", __func__,
PTR_ERR(priv->gfargrp[priv->num_grps].
msg_virtual_tx[i]));
}
}
}
#endif
priv->num_grps++;
return 0;
}
//arch/powerpc/kernel/irq.c
unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
{
struct of_irq oirq;
if (of_irq_map_one(dev, index, &oirq))
return NO_IRQ;
return irq_create_of_mapping(oirq.controller, oirq.specifier,
oirq.size);
}
//arch/powerpc/kernel/prom_parse.c
int of_irq_map_one(struct device_node *device, int index, struct of_irq *out_irq)
{
struct device_node *p;
const u32 *intspec, *tmp, *addr;
u32 intsize, intlen;
int res = -EINVAL;
DBG("of_irq_map_one: dev=%s, index=%d\n", device->full_name, index);//iindex对发送，接收，错误分别是0,1,2.对于发送中断打印of_irq_map_one: dev=/soc@ffe00000/ethernet@b1000/queue-group@0, index=0
/* OldWorld mac stuff is "special", handle out of line */
if (of_irq_workarounds & OF_IMAP_OLDWORLD_MAC)//假
return of_irq_map_oldworld(device, index, out_irq);
/* Get the interrupts property */
intspec = of_get_property(device, "interrupts", &intlen);//intspec指向6个元素的数组，intspec[0]=29,intspec[1]=2,intspec[2]=30,intspec[3]=2,intspec[4]=34,intspec[5]=2,
if (intspec == NULL)
return -EINVAL;
intlen /= sizeof(u32);
/* Get the reg property (if any) */
addr = of_get_property(device, "reg", NULL);
/* Look for the interrupt parent. */
p = of_irq_find_parent(device);//查找设备中断最终父节点，其实就是pic节点 ,在dts文件中 mpic: pic@40000 { interrupt-controller; #address-cells = <0>; #interrupt-cells = <2>; reg = <0x40000 0x40000>; compatible = "chrp,open-pic"; device_type = "open-pic"; };
if (p == NULL)
return -EINVAL;
/* Get size of interrupt specifier */
tmp = of_get_property(p, "#interrupt-cells", NULL);
if (tmp == NULL)
goto out;
intsize = *tmp;//intsize为2
DBG(" intsize=%d intlen=%d\n", intsize, intlen);// intsize=2 intlen=6
/* Check index */
if ((index + 1) * intsize > intlen)//对于发送，接收，错误都是假
goto out;
/* Get new specifier and map it */
res = of_irq_map_raw(p, intspec + index * intsize, intsize,
addr, out_irq);
out:
of_node_put(p);
return res;
}
int of_irq_map_raw(struct device_node *parent, const u32 *intspec, u32 ointsize,
const u32 *addr, struct of_irq *out_irq)
{
struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL;
const u32 *tmp, *imap, *imask;
u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0;
int imaplen, match, i;
DBG("of_irq_map_raw: par=%s,intspec=[0x%08x 0x%08x...],ointsize=%d\n",
parent->full_name, intspec[0], intspec[1], ointsize);//对于发送中断of_irq_map_raw: par=/soc@ffe00000/pic@40000,intspec=[0x0000001d 0x00000002...],ointsize=2
ipar = of_node_get(parent);
/* First get the #interrupt-cells property of the current cursor
* that tells us how to interpret the passed-in intspec. If there
* is none, we are nice and just walk up the tree
*/
do {
tmp = of_get_property(ipar, "#interrupt-cells", NULL);//因为ipar已经是pic，所以有此属性
if (tmp != NULL) {
intsize = *tmp;
break;
}
tnode = ipar;
ipar = of_irq_find_parent(ipar);
of_node_put(tnode);
} while (ipar);
if (ipar == NULL) {
DBG(" -> no parent found !\n");
goto fail;
}
DBG("of_irq_map_raw: ipar=%s, size=%d\n", ipar->full_name, intsize);//of_irq_map_raw: ipar=/soc@ffe00000/pic@40000, size=2
if (ointsize != intsize)//假
return -EINVAL;
/* Look for this #address-cells. We have to implement the old linux
* trick of looking for the parent here as some device-trees rely on it
*/
old = of_node_get(ipar);
do {
tmp = of_get_property(old, "#address-cells", NULL);//有此属性值为0，所以*tmp值为0
tnode = of_get_parent(old);
of_node_put(old);
old = tnode;
} while(old && tmp == NULL);
of_node_put(old);
old = NULL;
addrsize = (tmp == NULL) ? 2 : *tmp;
DBG(" -> addrsize=%d\n", addrsize);// -> addrsize=0
/* Now start the actual "proper" walk of the interrupt tree */
while (ipar != NULL) {
/* Now check if cursor is an interrupt-controller and if it is
* then we are done
*/
if (of_get_property(ipar, "interrupt-controller", NULL) != //有此属性
NULL) {
DBG(" -> got it !\n");
memcpy(out_irq->specifier, intspec,
intsize * sizeof(u32));//把中断向量和中断触发方式拷贝到specifier，对于发送其值分别为29,2，表示中断向量为29，高电平触发
out_irq->size = intsize;
out_irq->controller = ipar;
of_node_put(old);
return 0;
}
/* Now look for an interrupt-map */
imap = of_get_property(ipar, "interrupt-map", &imaplen);
/* No interrupt map, check for an interrupt parent */
if (imap == NULL) {
DBG(" -> no map, getting parent\n");
newpar = of_irq_find_parent(ipar);
goto skiplevel;
}
imaplen /= sizeof(u32);
/* Look for a mask */
imask = of_get_property(ipar, "interrupt-map-mask", NULL);
/* If we were passed no "reg" property and we attempt to parse
* an interrupt-map, then #address-cells must be 0.
* Fail if it's not.
*/
if (addr == NULL && addrsize != 0) {
DBG(" -> no reg passed in when needed !\n");
goto fail;
}
/* Parse interrupt-map */
match = 0;
while (imaplen > (addrsize + intsize + 1) && !match) {
/* Compare specifiers */
match = 1;
for (i = 0; i < addrsize && match; ++i) {
u32 mask = imask ? imask[i] : 0xffffffffu;
match = ((addr[i] ^ imap[i]) & mask) == 0;
}
for (; i < (addrsize + intsize) && match; ++i) {
u32 mask = imask ? imask[i] : 0xffffffffu;
match =
((intspec[i-addrsize] ^ imap[i]) & mask) == 0;
}
imap += addrsize + intsize;
imaplen -= addrsize + intsize;
DBG(" -> match=%d (imaplen=%d)\n", match, imaplen);
/* Get the interrupt parent */
if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
newpar = of_node_get(of_irq_dflt_pic);
else
newpar = of_find_node_by_phandle((phandle)*imap);
imap++;
--imaplen;
/* Check if not found */
if (newpar == NULL) {
DBG(" -> imap parent not found !\n");
goto fail;
}
/* Get #interrupt-cells and #address-cells of new
* parent
*/
tmp = of_get_property(newpar, "#interrupt-cells", NULL);
if (tmp == NULL) {
DBG(" -> parent lacks #interrupt-cells !\n");
goto fail;
}
newintsize = *tmp;
tmp = of_get_property(newpar, "#address-cells", NULL);
newaddrsize = (tmp == NULL) ? 0 : *tmp;
DBG(" -> newintsize=%d, newaddrsize=%d\n",
newintsize, newaddrsize);
/* Check for malformed properties */
if (imaplen < (newaddrsize + newintsize))
goto fail;
imap += newaddrsize + newintsize;
imaplen -= newaddrsize + newintsize;
DBG(" -> imaplen=%d\n", imaplen);
}
if (!match)
goto fail;
of_node_put(old);
old = of_node_get(newpar);
addrsize = newaddrsize;
intsize = newintsize;
intspec = imap - intsize;
addr = intspec - addrsize;
skiplevel:
/* Iterate again with new parent */
DBG(" -> new parent: %s\n", newpar ? newpar->full_name : "<>");
of_node_put(ipar);
ipar = newpar;
newpar = NULL;
}
fail:
of_node_put(ipar);
of_node_put(old);
of_node_put(newpar);
return -EINVAL;
}
unsigned int irq_create_of_mapping(struct device_node *controller,
const u32 *intspec, unsigned int intsize)
{
struct irq_host *host;
irq_hw_number_t hwirq;
unsigned int type = IRQ_TYPE_NONE;
unsigned int virq;
if (controller == NULL)
host = irq_default_host;
else
host = irq_find_host(controller);//查找得到就是mpic->irqhost
if (host == NULL) {
printk(KERN_WARNING "irq: no irq host found for %s !\n",
controller->full_name);
return NO_IRQ;
}
/* If host has no translation, then we assume interrupt line */
if (host->ops->xlate == NULL)
hwirq = intspec[0];
else {
if (host->ops->xlate(host, controller, intspec, intsize,
&hwirq, &type))//调用mpic_host_ops中的函数mpic_host_xlate
return NO_IRQ;
}
/* Create mapping */
virq = irq_create_mapping(host, hwirq);
if (virq == NO_IRQ)
return virq;
/* Set type if specified and different than the current one */
if (type != IRQ_TYPE_NONE &&
type != (irq_to_desc(virq)->status & IRQF_TRIGGER_MASK))
set_irq_type(virq, type);
return virq;
}
//arch/powerpc/sysdev/mpic.c
static int mpic_host_xlate(struct irq_host *h, struct device_node *ct,
const u32 *intspec, unsigned int intsize,
irq_hw_number_t *out_hwirq, unsigned int *out_flags)
{
static unsigned char map_mpic_senses[4] = {
IRQ_TYPE_EDGE_RISING,
IRQ_TYPE_LEVEL_LOW,
IRQ_TYPE_LEVEL_HIGH,
IRQ_TYPE_EDGE_FALLING,
};
*out_hwirq = intspec[0];//中断向量号
if (intsize > 1) {//intsize为2
u32 mask = 0x3;
/* Apple invented a new race of encoding on machines with
* an HT APIC. They encode, among others, the index within
* the HT APIC. We don't care about it here since thankfully,
* it appears that they have the APIC already properly
* configured, and thus our current fixup code that reads the
* APIC config works fine. However, we still need to mask out
* bits in the specifier to make sure we only get bit 0 which
* is the level/edge bit (the only sense bit exposed by Apple),
* as their bit 1 means something else.
*/
if (machine_is(powermac))
mask = 0x1;
*out_flags = map_mpic_senses[intspec[1] & mask];//intspec[1]为2，所以*out_flags为4表示高电平触发
} else
*out_flags = IRQ_TYPE_NONE;
DBG("mpic: xlate (%d cells: 0x%08x 0x%08x) to line 0x%lx sense 0x%x\n",
intsize, intspec[0], intspec[1], *out_hwirq, *out_flags);//mpic: xlate (2 cells: 0x0000001d 0x00000002) to line 0x1d sense 0x4
return 0;
}
unsigned int irq_create_mapping(struct irq_host *host,
irq_hw_number_t hwirq)
{
unsigned int virq, hint;
pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq);
/* Look for default host if nececssary */
if (host == NULL)
host = irq_default_host;
if (host == NULL) {
printk(KERN_WARNING "irq_create_mapping called for"
" NULL host, hwirq=%lx\n", hwirq);
WARN_ON(1);
return NO_IRQ;
}
pr_debug("irq: -> using host @%p\n", host);
/* Check if mapping already exist, if it does, call
* host->ops->map() to update the flags
*/
virq = irq_find_mapping(host, hwirq);//查找hwirq硬件IRQ号对应的虚拟IRQ号，因为么第一次所以找不到
if (virq != NO_IRQ) {//第一次肯定找不到
if (host->ops->remap)
host->ops->remap(host, virq, hwirq);
pr_debug("irq: -> existing mapping on virq %d\n", virq);
return virq;
}
/* Get a virtual interrupt number */
if (host->revmap_type == IRQ_HOST_MAP_LEGACY) {//false
/* Handle legacy */
virq = (unsigned int)hwirq;
if (virq == 0 || virq >= NUM_ISA_INTERRUPTS)
return NO_IRQ;
return virq;
} else {
/* Allocate a virtual interrupt number */
hint = hwirq % irq_virq_count;
virq = irq_alloc_virt(host, 1, hint);//分配一个虚拟的virq
if (virq == NO_IRQ) {
pr_debug("irq: -> virq allocation failed\n");
return NO_IRQ;
}
}
if (irq_setup_virq(host, virq, hwirq))
return NO_IRQ;
printk(KERN_DEBUG "irq: irq %lu on host %s mapped to virtual irq %u\n",
hwirq, host->of_node ? host->of_node->full_name : "null", virq);
return virq;
}
unsigned int irq_find_mapping(struct irq_host *host,
irq_hw_number_t hwirq)
{
unsigned int i;
unsigned int hint = hwirq % irq_virq_count;//irq_virq_count为512，所以29%512=29
/* Look for default host if nececssary */
if (host == NULL)
host = irq_default_host;
if (host == NULL)
return NO_IRQ;
/* legacy -> bail early */
if (host->revmap_type == IRQ_HOST_MAP_LEGACY)//false
return hwirq;
/* Slow path does a linear search of the map */
if (hint < NUM_ISA_INTERRUPTS)//NUM_ISA_INTERRUPTS为16
hint = NUM_ISA_INTERRUPTS;
i = hint;
do {
if (irq_map[i].host == host &&
irq_map[i].hwirq == hwirq)//查找是否有hwirq
return i;
i++;
if (i >= irq_virq_count)
i = NUM_ISA_INTERRUPTS;
} while(i != hint);
return NO_IRQ;
}
unsigned int irq_alloc_virt(struct irq_host *host,
unsigned int count,
unsigned int hint)
{
unsigned long flags;
unsigned int i, j, found = NO_IRQ;
if (count == 0 || count > (irq_virq_count - NUM_ISA_INTERRUPTS))
return NO_IRQ;
raw_spin_lock_irqsave(&irq_big_lock, flags);
/* Use hint for 1 interrupt if any */
if (count == 1 && hint >= NUM_ISA_INTERRUPTS &&
hint < irq_virq_count && irq_map[hint].host == NULL) {//hint是否可以，第一次，所以查找成功
found = hint;／／虚拟ｉｒｑ等于ｈｉｎｔ
goto hint_found;
}
/* Look for count consecutive numbers in the allocatable
* (non-legacy) space
*/
for (i = NUM_ISA_INTERRUPTS, j = 0; i < irq_virq_count; i++) {
if (irq_map[i].host != NULL)
j = 0;
else
j++;
if (j == count) {
found = i - count + 1;
break;
}
}
if (found == NO_IRQ) {
raw_spin_unlock_irqrestore(&irq_big_lock, flags);
return NO_IRQ;
}
hint_found:
for (i = found; i < (found + count); i++) {
irq_map[i].hwirq = host->inval_irq;
smp_wmb();
irq_map[i].host = host;//保存ｈｏｓｔ
}
raw_spin_unlock_irqrestore(&irq_big_lock, flags);
return found;
}
static int irq_setup_virq(struct irq_host *host, unsigned int virq,
irq_hw_number_t hwirq)
{
struct irq_desc *desc;
desc = irq_to_desc_alloc_node(virq, 0);／／分配给ｖｉｒｑ使用的desc
if (!desc) {
pr_debug("irq: -> allocating desc failed\n");
goto error;
}
/* Clear IRQ_NOREQUEST flag */
desc->status &= ~IRQ_NOREQUEST;
/* map it */
smp_wmb();
irq_map[virq].hwirq = hwirq;//记录下来
smp_mb();
if (host->ops->map(host, virq, hwirq)) {//其实是调用mpic_host_ops中的mpic_host_map
pr_debug("irq: -> mapping failed, freeing\n");
goto error;
}
return 0;
error:
irq_free_virt(virq, 1);
return -1;
}
static int mpic_host_map(struct irq_host *h, unsigned int virq,
irq_hw_number_t hw)
{
struct mpic *mpic = h->host_data;
struct irq_chip *chip;
DBG("mpic: map virq %d, hwirq 0x%lx\n", virq, hw);
if (hw == mpic->spurious_vec)
return -EINVAL;
if (mpic->protected && test_bit(hw, mpic->protected))
return -EINVAL;
else if (hw >= mpic->timer_vecs[0] && hw <= mpic->timer_vecs[3]) {
WARN_ON(!(mpic->flags & MPIC_PRIMARY));
DBG("mpic: mapping as timer\n");
set_irq_chip_data(virq, mpic);
set_irq_chip_and_handler(virq, &mpic->hc_tm,
handle_fasteoi_irq);
return 0;
}
#ifdef CONFIG_SMP
else if (hw >= mpic->ipi_vecs[0]) {
WARN_ON(!(mpic->flags & MPIC_PRIMARY));
DBG("mpic: mapping as IPI\n");
set_irq_chip_data(virq, mpic);
set_irq_chip_and_handler(virq, &mpic->hc_ipi,
handle_percpu_irq);
return 0;
}
#endif /* CONFIG_SMP */
if (hw >= mpic->irq_count)
return -EINVAL;
mpic_msi_reserve_hwirq(mpic, hw);
/* Default chip */
chip = &mpic->hc_irq;//其实就是mpic_irq_chip
#ifdef CONFIG_MPIC_U3_HT_IRQS
/* Check for HT interrupts, override vecpri */
if (mpic_is_ht_interrupt(mpic, hw))
chip = &mpic->hc_ht_irq;
#endif /* CONFIG_MPIC_U3_HT_IRQS */
DBG("mpic: mapping to irq chip @%p\n", chip);
set_irq_chip_data(virq, mpic);//把mpic保存到virq对于的desc中
set_irq_chip_and_handler(virq, chip, handle_fasteoi_irq);;//把chip，handle_fasteoi_irq保存到virq对于的desc中
/* Set default irq type */
set_irq_type(virq, IRQ_TYPE_NONE);
return 0;
}
void
set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
irq_flow_handler_t handle)
{
set_irq_chip(irq, chip);//保存chip到irq对于的desc
__set_irq_handler(irq, handle, 0, NULL);//保存handle到irq对于desc的 handle_irq
}
int set_irq_type(unsigned int irq, unsigned int type)
{
struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
int ret = -ENXIO;
if (!desc) {
printk(KERN_ERR "Trying to set irq type for IRQ%d\n", irq);
return -ENODEV;
}
type &= IRQ_TYPE_SENSE_MASK;
if (type == IRQ_TYPE_NONE)
return 0;
raw_spin_lock_irqsave(&desc->lock, flags);
ret = __irq_set_trigger(desc, irq, type);
raw_spin_unlock_irqrestore(&desc->lock, flags);
return ret;
}
int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
unsigned long flags)
{
int ret;
struct irq_chip *chip = desc->chip;
if (!chip || !chip->set_type) {
/*
* IRQF_TRIGGER_* but the PIC does not support multiple
* flow-types?
*/
pr_debug("No set_type function for IRQ %d (%s)\n", irq,
chip ? (chip->name ? : "unknown") : "unknown");
return 0;
}
/* caller masked out all except trigger mode flags */
ret = chip->set_type(irq, flags);//调用mpic_irq_chip的mpic_set_irq_type
if (ret)
pr_err("setting trigger mode %d for irq %u failed (%pF)\n",
(int)flags, irq, chip->set_type);
else {
if (flags & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
flags |= IRQ_LEVEL;
/* note that IRQF_TRIGGER_MASK == IRQ_TYPE_SENSE_MASK */
desc->status &= ~(IRQ_LEVEL | IRQ_TYPE_SENSE_MASK);
desc->status |= flags;
if (chip != desc->chip)
irq_chip_set_defaults(desc->chip);
}
return ret;
}
int mpic_set_irq_type(unsigned int virq, unsigned int flow_type)
{
struct mpic *mpic = mpic_from_irq(virq);
unsigned int src = mpic_irq_to_hw(virq);
struct irq_desc *desc = irq_to_desc(virq);
unsigned int vecpri, vold, vnew;
DBG("mpic: set_irq_type(mpic:@%p,virq:%d,src:0x%x,type:0x%x)\n",
mpic, virq, src, flow_type);//打印mpic: set_irq_type(mpic:@ee402000,virq:29,src:0x1d,type:0x4)
if (src >= mpic->irq_count)
return -EINVAL;
if (flow_type == IRQ_TYPE_NONE)
if (mpic->senses && src < mpic->senses_count)
flow_type = mpic->senses[src];
if (flow_type == IRQ_TYPE_NONE)
flow_type = IRQ_TYPE_LEVEL_LOW;
desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL);
desc->status |= flow_type & IRQ_TYPE_SENSE_MASK;
if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
desc->status |= IRQ_LEVEL;
if (mpic_is_ht_interrupt(mpic, src))
vecpri = MPIC_VECPRI_POLARITY_POSITIVE |
MPIC_VECPRI_SENSE_EDGE;
else
vecpri = mpic_type_to_vecpri(mpic, flow_type);//把flow_type转换为具体的触发方式
vold = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));//读取向量/优先级寄存器
vnew = vold & ~(MPIC_INFO(VECPRI_POLARITY_MASK) |
MPIC_INFO(VECPRI_SENSE_MASK));
vnew |= vecpri;
if (vold != vnew)
mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vnew);
return 0;
}
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