sparc32, leon: code cleanup of timer/IRQ controller initialization

Cleaned up leon_init_timers() by removing unnecessary double checking
and one indentation level. Changed LEON_IMASK to LEON_IMASK(cpu).

Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 72 insertions, 84 deletions

diff --git a/arch/sparc/kernel/leon_kernel.c b/arch/sparc/kernel/leon_kernel.c
index 5d7e41c1936..d8fafeacb49 100644
--- a/arch/sparc/kernel/leon_kernel.c
+++ b/arch/sparc/kernel/leon_kernel.c
@@ -37,7 +37,7 @@ unsigned long leon3_gptimer_irq; /* interrupt controller irq number */
 unsigned long leon3_gptimer_idx; /* Timer Index (0..6) within Timer Core */
 int leon3_ticker_irq; /* Timer ticker IRQ */
 unsigned int sparc_leon_eirq;
-#define LEON_IMASK (&leon3_irqctrl_regs->mask[0])
+#define LEON_IMASK(cpu) (&leon3_irqctrl_regs->mask[cpu])
 #define LEON_IACK (&leon3_irqctrl_regs->iclear)
 #define LEON_DO_ACK_HW 1
 
@@ -79,8 +79,8 @@ void leon_eirq_setup(unsigned int eirq)
          */
         irq_link(veirq);
         mask = 1 << eirq;
-        oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK);
-        LEON3_BYPASS_STORE_PA(LEON_IMASK, (oldmask | mask));
+        oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(0));
+        LEON3_BYPASS_STORE_PA(LEON_IMASK(0), (oldmask | mask));
         sparc_leon_eirq = eirq;
 }
 
@@ -101,23 +101,23 @@ static inline unsigned long get_irqmask(unsigned int irq)
 
 static void leon_unmask_irq(struct irq_data *data)
 {
-        unsigned long mask, flags;
+        unsigned long mask, oldmask, flags;
 
         mask = (unsigned long)data->chip_data;
         spin_lock_irqsave(&leon_irq_lock, flags);
-        LEON3_BYPASS_STORE_PA(LEON_IMASK,
-                              (LEON3_BYPASS_LOAD_PA(LEON_IMASK) | (mask)));
+        oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(0));
+        LEON3_BYPASS_STORE_PA(LEON_IMASK(0), (oldmask | mask));
         spin_unlock_irqrestore(&leon_irq_lock, flags);
 }
 
 static void leon_mask_irq(struct irq_data *data)
 {
-        unsigned long mask, flags;
+        unsigned long mask, oldmask, flags;
 
         mask = (unsigned long)data->chip_data;
         spin_lock_irqsave(&leon_irq_lock, flags);
-        LEON3_BYPASS_STORE_PA(LEON_IMASK,
-                              (LEON3_BYPASS_LOAD_PA(LEON_IMASK) & ~(mask)));
+        oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(0));
+        LEON3_BYPASS_STORE_PA(LEON_IMASK(0), (oldmask & ~mask));
         spin_unlock_irqrestore(&leon_irq_lock, flags);
 }
 
@@ -261,92 +261,83 @@ void __init leon_init_timers(irq_handler_t counter_fn)
                         leon3_gptimer_irq = *(unsigned int *)pp->value;
         } while (0);
 
-        if (leon3_gptimer_regs && leon3_irqctrl_regs && leon3_gptimer_irq) {
-                LEON3_BYPASS_STORE_PA(
-                        &leon3_gptimer_regs->e[leon3_gptimer_idx].val, 0);
-                LEON3_BYPASS_STORE_PA(
-                        &leon3_gptimer_regs->e[leon3_gptimer_idx].rld,
-                        (((1000000 / HZ) - 1)));
-                LEON3_BYPASS_STORE_PA(
+        if (!(leon3_gptimer_regs && leon3_irqctrl_regs && leon3_gptimer_irq))
+                goto bad;
+
+        LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val, 0);
+        LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld,
+                                (((1000000 / HZ) - 1)));
+        LEON3_BYPASS_STORE_PA(
                         &leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl, 0);
 
 #ifdef CONFIG_SMP
-                leon3_ticker_irq = leon3_gptimer_irq + 1 + leon3_gptimer_idx;
-
-                if (!(LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config) &
-                      (1<<LEON3_GPTIMER_SEPIRQ))) {
-                        prom_printf("irq timer not configured with separate irqs\n");
-                        BUG();
-                }
+        leon3_ticker_irq = leon3_gptimer_irq + 1 + leon3_gptimer_idx;
 
-                LEON3_BYPASS_STORE_PA(
-                        &leon3_gptimer_regs->e[leon3_gptimer_idx+1].val, 0);
-                LEON3_BYPASS_STORE_PA(
-                        &leon3_gptimer_regs->e[leon3_gptimer_idx+1].rld,
-                        (((1000000/HZ) - 1)));
-                LEON3_BYPASS_STORE_PA(
-                        &leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl, 0);
-# endif
-
-                /*
-                 * The IRQ controller may (if implemented) consist of multiple
-                 * IRQ controllers, each mapped on a 4Kb boundary.
-                 * Each CPU may be routed to different IRQCTRLs, however
-                 * we assume that all CPUs (in SMP system) is routed to the
-                 * same IRQ Controller, and for non-SMP only one IRQCTRL is
-                 * accessed anyway.
-                 * In AMP systems, Linux must run on CPU0 for the time being.
-                 */
-                cpu = sparc_leon3_cpuid();
-                icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[cpu/8]);
-                icsel = (icsel >> ((7 - (cpu&0x7)) * 4)) & 0xf;
-                leon3_irqctrl_regs += icsel;
-
-                /* Probe extended IRQ controller */
-                eirq = (LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->mpstatus)
-                        >> 16) & 0xf;
-                if (eirq != 0)
-                        leon_eirq_setup(eirq);
-        } else {
-                goto bad;
+        if (!(LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config) &
+              (1<<LEON3_GPTIMER_SEPIRQ))) {
+                printk(KERN_ERR "timer not configured with separate irqs\n");
+                BUG();
         }
 
+        LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].val,
+                                0);
+        LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].rld,
+                                (((1000000/HZ) - 1)));
+        LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
+                                0);
+#endif
+
+        /*
+         * The IRQ controller may (if implemented) consist of multiple
+         * IRQ controllers, each mapped on a 4Kb boundary.
+         * Each CPU may be routed to different IRQCTRLs, however
+         * we assume that all CPUs (in SMP system) is routed to the
+         * same IRQ Controller, and for non-SMP only one IRQCTRL is
+         * accessed anyway.
+         * In AMP systems, Linux must run on CPU0 for the time being.
+         */
+        cpu = sparc_leon3_cpuid();
+        icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[cpu/8]);
+        icsel = (icsel >> ((7 - (cpu&0x7)) * 4)) & 0xf;
+        leon3_irqctrl_regs += icsel;
+
+        /* Probe extended IRQ controller */
+        eirq = (LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->mpstatus)
+                >> 16) & 0xf;
+        if (eirq != 0)
+                leon_eirq_setup(eirq);
+
         irq = _leon_build_device_irq(NULL, leon3_gptimer_irq+leon3_gptimer_idx);
         err = request_irq(irq, counter_fn, IRQF_TIMER, "timer", NULL);
-
         if (err) {
-                printk(KERN_ERR "leon_time_init: unable to attach IRQ%d\n",
-                       irq);
+                printk(KERN_ERR "unable to attach timer IRQ%d\n", irq);
                 prom_halt();
         }
 
-        if (leon3_gptimer_regs) {
-                LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,
-                                      LEON3_GPTIMER_EN |
-                                      LEON3_GPTIMER_RL |
-                                      LEON3_GPTIMER_LD | LEON3_GPTIMER_IRQEN);
+        LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,
+                              LEON3_GPTIMER_EN |
+                              LEON3_GPTIMER_RL |
+                              LEON3_GPTIMER_LD |
+                              LEON3_GPTIMER_IRQEN);
 
 #ifdef CONFIG_SMP
-                /* Install per-cpu IRQ handler for broadcasted ticker */
-                irq = leon_build_device_irq(leon3_ticker_irq,
-                                                handle_percpu_irq, "per-cpu",
-                                                0);
-                err = request_irq(irq, leon_percpu_timer_interrupt,
-                                        IRQF_PERCPU | IRQF_TIMER, "ticker",
-                                        NULL);
-                if (err) {
-                        printk(KERN_ERR "unable to attach ticker IRQ%d\n", irq);
-                        prom_halt();
-                }
+        /* Install per-cpu IRQ handler for broadcasted ticker */
+        irq = leon_build_device_irq(leon3_ticker_irq, handle_percpu_irq,
+                                    "per-cpu", 0);
+        err = request_irq(irq, leon_percpu_timer_interrupt,
+                          IRQF_PERCPU | IRQF_TIMER, "ticker",
+                          NULL);
+        if (err) {
+                printk(KERN_ERR "unable to attach ticker IRQ%d\n", irq);
+                prom_halt();
+        }
 
-                LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
-                                      LEON3_GPTIMER_EN |
-                                      LEON3_GPTIMER_RL |
-                                      LEON3_GPTIMER_LD |
-                                      LEON3_GPTIMER_IRQEN);
+        LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
+                              LEON3_GPTIMER_EN |
+                              LEON3_GPTIMER_RL |
+                              LEON3_GPTIMER_LD |
+                              LEON3_GPTIMER_IRQEN);
 #endif
-
-        }
         return;
 bad:
         printk(KERN_ERR "No Timer/irqctrl found\n");
@@ -363,9 +354,6 @@ void leon_load_profile_irq(int cpu, unsigned int limit)
         BUG();
 }
 
-
-
-
 void __init leon_trans_init(struct device_node *dp)
 {
         if (strcmp(dp->type, "cpu") == 0 && strcmp(dp->name, "<NULL>") == 0) {
@@ -420,8 +408,8 @@ void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu)
         unsigned long mask, flags, *addr;
         mask = get_irqmask(irq_nr);
         spin_lock_irqsave(&leon_irq_lock, flags);
-        addr = (unsigned long *)&(leon3_irqctrl_regs->mask[cpu]);
-        LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | (mask)));
+        addr = (unsigned long *)LEON_IMASK(cpu);
+        LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | mask));
         spin_unlock_irqrestore(&leon_irq_lock, flags);
 }