mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-04 01:49:36 +00:00
[POWERPC] Improve MPIC driver auto-configuration from DT
This patch applies on top of the MPIC DCR support. It makes the MPIC driver capable of a lot more auto-configuration based on the device-tree, for example, it can retreive it's own physical address if not passed as an argument, find out if it's DCR or MMIO mapped, and set the BIG_ENDIAN flag automatically in the presence of a "big-endian" property in the device-tree node. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
parent
fbf0274e43
commit
a959ff56bb
2 changed files with 39 additions and 15 deletions
|
@ -894,7 +894,7 @@ static struct irq_host_ops mpic_host_ops = {
|
|||
*/
|
||||
|
||||
struct mpic * __init mpic_alloc(struct device_node *node,
|
||||
unsigned long phys_addr,
|
||||
phys_addr_t phys_addr,
|
||||
unsigned int flags,
|
||||
unsigned int isu_size,
|
||||
unsigned int irq_count,
|
||||
|
@ -904,6 +904,7 @@ struct mpic * __init mpic_alloc(struct device_node *node,
|
|||
u32 reg;
|
||||
const char *vers;
|
||||
int i;
|
||||
u64 paddr = phys_addr;
|
||||
|
||||
mpic = alloc_bootmem(sizeof(struct mpic));
|
||||
if (mpic == NULL)
|
||||
|
@ -943,6 +944,11 @@ struct mpic * __init mpic_alloc(struct device_node *node,
|
|||
mpic->irq_count = irq_count;
|
||||
mpic->num_sources = 0; /* so far */
|
||||
|
||||
/* Check for "big-endian" in device-tree */
|
||||
if (node && get_property(node, "big-endian", NULL) != NULL)
|
||||
mpic->flags |= MPIC_BIG_ENDIAN;
|
||||
|
||||
|
||||
#ifdef CONFIG_MPIC_WEIRD
|
||||
mpic->hw_set = mpic_infos[MPIC_GET_REGSET(flags)];
|
||||
#endif
|
||||
|
@ -951,11 +957,17 @@ struct mpic * __init mpic_alloc(struct device_node *node,
|
|||
mpic->reg_type = (flags & MPIC_BIG_ENDIAN) ?
|
||||
mpic_access_mmio_be : mpic_access_mmio_le;
|
||||
|
||||
/* If no physical address is passed in, a device-node is mandatory */
|
||||
BUG_ON(paddr == 0 && node == NULL);
|
||||
|
||||
/* If no physical address passed in, check if it's dcr based */
|
||||
if (paddr == 0 && get_property(node, "dcr-reg", NULL) != NULL)
|
||||
mpic->flags |= MPIC_USES_DCR;
|
||||
|
||||
#ifdef CONFIG_PPC_DCR
|
||||
if (mpic->flags & MPIC_USES_DCR) {
|
||||
const u32 *dbasep;
|
||||
BUG_ON(mpic->of_node == NULL);
|
||||
dbasep = get_property(mpic->of_node, "dcr-reg", NULL);
|
||||
dbasep = get_property(node, "dcr-reg", NULL);
|
||||
BUG_ON(dbasep == NULL);
|
||||
mpic->dcr_base = *dbasep;
|
||||
mpic->reg_type = mpic_access_dcr;
|
||||
|
@ -964,9 +976,20 @@ struct mpic * __init mpic_alloc(struct device_node *node,
|
|||
BUG_ON (mpic->flags & MPIC_USES_DCR);
|
||||
#endif /* CONFIG_PPC_DCR */
|
||||
|
||||
/* If the MPIC is not DCR based, and no physical address was passed
|
||||
* in, try to obtain one
|
||||
*/
|
||||
if (paddr == 0 && !(mpic->flags & MPIC_USES_DCR)) {
|
||||
const u32 *reg;
|
||||
reg = get_property(node, "reg", NULL);
|
||||
BUG_ON(reg == NULL);
|
||||
paddr = of_translate_address(node, reg);
|
||||
BUG_ON(paddr == OF_BAD_ADDR);
|
||||
}
|
||||
|
||||
/* Map the global registers */
|
||||
mpic_map(mpic, phys_addr, &mpic->gregs, MPIC_INFO(GREG_BASE), 0x1000);
|
||||
mpic_map(mpic, phys_addr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000);
|
||||
mpic_map(mpic, paddr, &mpic->gregs, MPIC_INFO(GREG_BASE), 0x1000);
|
||||
mpic_map(mpic, paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000);
|
||||
|
||||
/* Reset */
|
||||
if (flags & MPIC_WANTS_RESET) {
|
||||
|
@ -991,7 +1014,7 @@ struct mpic * __init mpic_alloc(struct device_node *node,
|
|||
|
||||
/* Map the per-CPU registers */
|
||||
for (i = 0; i < mpic->num_cpus; i++) {
|
||||
mpic_map(mpic, phys_addr, &mpic->cpuregs[i],
|
||||
mpic_map(mpic, paddr, &mpic->cpuregs[i],
|
||||
MPIC_INFO(CPU_BASE) + i * MPIC_INFO(CPU_STRIDE),
|
||||
0x1000);
|
||||
}
|
||||
|
@ -999,7 +1022,7 @@ struct mpic * __init mpic_alloc(struct device_node *node,
|
|||
/* Initialize main ISU if none provided */
|
||||
if (mpic->isu_size == 0) {
|
||||
mpic->isu_size = mpic->num_sources;
|
||||
mpic_map(mpic, phys_addr, &mpic->isus[0],
|
||||
mpic_map(mpic, paddr, &mpic->isus[0],
|
||||
MPIC_INFO(IRQ_BASE), MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
|
||||
}
|
||||
mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
|
||||
|
@ -1020,10 +1043,11 @@ struct mpic * __init mpic_alloc(struct device_node *node,
|
|||
vers = "<unknown>";
|
||||
break;
|
||||
}
|
||||
printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %lx, max %d CPUs\n",
|
||||
name, vers, phys_addr, mpic->num_cpus);
|
||||
printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n", mpic->isu_size,
|
||||
mpic->isu_shift, mpic->isu_mask);
|
||||
printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %llx,"
|
||||
" max %d CPUs\n",
|
||||
name, vers, (unsigned long long)paddr, mpic->num_cpus);
|
||||
printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n",
|
||||
mpic->isu_size, mpic->isu_shift, mpic->isu_mask);
|
||||
|
||||
mpic->next = mpics;
|
||||
mpics = mpic;
|
||||
|
@ -1037,13 +1061,13 @@ struct mpic * __init mpic_alloc(struct device_node *node,
|
|||
}
|
||||
|
||||
void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
|
||||
unsigned long phys_addr)
|
||||
phys_addr_t paddr)
|
||||
{
|
||||
unsigned int isu_first = isu_num * mpic->isu_size;
|
||||
|
||||
BUG_ON(isu_num >= MPIC_MAX_ISU);
|
||||
|
||||
mpic_map(mpic, phys_addr, &mpic->isus[isu_num], 0,
|
||||
mpic_map(mpic, paddr, &mpic->isus[isu_num], 0,
|
||||
MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
|
||||
if ((isu_first + mpic->isu_size) > mpic->num_sources)
|
||||
mpic->num_sources = isu_first + mpic->isu_size;
|
||||
|
|
|
@ -364,7 +364,7 @@ struct mpic
|
|||
* that is senses[0] correspond to linux irq "irq_offset".
|
||||
*/
|
||||
extern struct mpic *mpic_alloc(struct device_node *node,
|
||||
unsigned long phys_addr,
|
||||
phys_addr_t phys_addr,
|
||||
unsigned int flags,
|
||||
unsigned int isu_size,
|
||||
unsigned int irq_count,
|
||||
|
@ -377,7 +377,7 @@ extern struct mpic *mpic_alloc(struct device_node *node,
|
|||
* @phys_addr: physical address of the ISU
|
||||
*/
|
||||
extern void mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
|
||||
unsigned long phys_addr);
|
||||
phys_addr_t phys_addr);
|
||||
|
||||
/* Set default sense codes
|
||||
*
|
||||
|
|
Loading…
Reference in a new issue