Merge branch 'x86/geode' into x86/urgent
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529d0e402e
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@ -33,6 +33,8 @@
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#include <linux/module.h>
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#include <asm/geode.h>
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#define MFGPT_DEFAULT_IRQ 7
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static struct mfgpt_timer_t {
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unsigned int avail:1;
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} mfgpt_timers[MFGPT_MAX_TIMERS];
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@ -157,29 +159,48 @@ int geode_mfgpt_toggle_event(int timer, int cmp, int event, int enable)
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}
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EXPORT_SYMBOL_GPL(geode_mfgpt_toggle_event);
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int geode_mfgpt_set_irq(int timer, int cmp, int irq, int enable)
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int geode_mfgpt_set_irq(int timer, int cmp, int *irq, int enable)
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{
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u32 val, dummy;
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int offset;
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u32 zsel, lpc, dummy;
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int shift;
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if (timer < 0 || timer >= MFGPT_MAX_TIMERS)
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return -EIO;
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if (geode_mfgpt_toggle_event(timer, cmp, MFGPT_EVENT_IRQ, enable))
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/*
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* Unfortunately, MFGPTs come in pairs sharing their IRQ lines. If VSA
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* is using the same CMP of the timer's Siamese twin, the IRQ is set to
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* 2, and we mustn't use nor change it.
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* XXX: Likewise, 2 Linux drivers might clash if the 2nd overwrites the
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* IRQ of the 1st. This can only happen if forcing an IRQ, calling this
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* with *irq==0 is safe. Currently there _are_ no 2 drivers.
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*/
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rdmsr(MSR_PIC_ZSEL_LOW, zsel, dummy);
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shift = ((cmp == MFGPT_CMP1 ? 0 : 4) + timer % 4) * 4;
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if (((zsel >> shift) & 0xF) == 2)
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return -EIO;
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rdmsr(MSR_PIC_ZSEL_LOW, val, dummy);
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/* Choose IRQ: if none supplied, keep IRQ already set or use default */
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if (!*irq)
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*irq = (zsel >> shift) & 0xF;
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if (!*irq)
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*irq = MFGPT_DEFAULT_IRQ;
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offset = (timer % 4) * 4;
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val &= ~((0xF << offset) | (0xF << (offset + 16)));
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/* Can't use IRQ if it's 0 (=disabled), 2, or routed to LPC */
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if (*irq < 1 || *irq == 2 || *irq > 15)
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return -EIO;
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rdmsr(MSR_PIC_IRQM_LPC, lpc, dummy);
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if (lpc & (1 << *irq))
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return -EIO;
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/* All chosen and checked - go for it */
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if (geode_mfgpt_toggle_event(timer, cmp, MFGPT_EVENT_IRQ, enable))
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return -EIO;
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if (enable) {
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val |= (irq & 0x0F) << (offset);
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val |= (irq & 0x0F) << (offset + 16);
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zsel = (zsel & ~(0xF << shift)) | (*irq << shift);
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wrmsr(MSR_PIC_ZSEL_LOW, zsel, dummy);
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}
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wrmsr(MSR_PIC_ZSEL_LOW, val, dummy);
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return 0;
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}
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@ -242,7 +263,7 @@ EXPORT_SYMBOL_GPL(geode_mfgpt_alloc_timer);
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static unsigned int mfgpt_tick_mode = CLOCK_EVT_MODE_SHUTDOWN;
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static u16 mfgpt_event_clock;
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static int irq = 7;
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static int irq;
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static int __init mfgpt_setup(char *str)
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{
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get_option(&str, &irq);
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@ -346,7 +367,7 @@ int __init mfgpt_timer_setup(void)
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mfgpt_event_clock = timer;
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/* Set up the IRQ on the MFGPT side */
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if (geode_mfgpt_setup_irq(mfgpt_event_clock, MFGPT_CMP2, irq)) {
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if (geode_mfgpt_setup_irq(mfgpt_event_clock, MFGPT_CMP2, &irq)) {
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printk(KERN_ERR "mfgpt-timer: Could not set up IRQ %d\n", irq);
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return -EIO;
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}
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@ -374,13 +395,14 @@ int __init mfgpt_timer_setup(void)
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&mfgpt_clockevent);
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printk(KERN_INFO
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"mfgpt-timer: registering the MFGPT timer as a clock event.\n");
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"mfgpt-timer: Registering MFGPT timer %d as a clock event, using IRQ %d\n",
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timer, irq);
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clockevents_register_device(&mfgpt_clockevent);
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return 0;
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err:
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geode_mfgpt_release_irq(mfgpt_event_clock, MFGPT_CMP2, irq);
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geode_mfgpt_release_irq(mfgpt_event_clock, MFGPT_CMP2, &irq);
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printk(KERN_ERR
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"mfgpt-timer: Unable to set up the MFGPT clock source\n");
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return -EIO;
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@ -50,6 +50,7 @@ extern int geode_get_dev_base(unsigned int dev);
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#define MSR_PIC_YSEL_HIGH 0x51400021
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#define MSR_PIC_ZSEL_LOW 0x51400022
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#define MSR_PIC_ZSEL_HIGH 0x51400023
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#define MSR_PIC_IRQM_LPC 0x51400025
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#define MSR_MFGPT_IRQ 0x51400028
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#define MSR_MFGPT_NR 0x51400029
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@ -237,7 +238,7 @@ static inline u16 geode_mfgpt_read(int timer, u16 reg)
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}
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extern int geode_mfgpt_toggle_event(int timer, int cmp, int event, int enable);
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extern int geode_mfgpt_set_irq(int timer, int cmp, int irq, int enable);
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extern int geode_mfgpt_set_irq(int timer, int cmp, int *irq, int enable);
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extern int geode_mfgpt_alloc_timer(int timer, int domain);
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#define geode_mfgpt_setup_irq(t, c, i) geode_mfgpt_set_irq((t), (c), (i), 1)
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