arch/x86/Kconfig

@@ -462,6 +462,14 @@ config X86_NUMACHIP
 	  enable more than ~168 cores.
 	  If you don't have one of these, you should say N here.
 
+config X86_PS4
+	bool "Sony PlayStation 4"
+	depends on X86_64
+	depends on X86_EXTENDED_PLATFORM
+	depends on PCI
+	---help---
+	  Select to include support for the Sony PlayStation 4 game console.
+
 config X86_VSMP
 	bool "ScaleMP vSMP"
 	select HYPERVISOR_GUEST

arch/x86/include/asm/msi.h

@@ -9,5 +9,6 @@ int pci_msi_prepare(struct irq_domain *domain, struct device *dev, int nvec,
 		    msi_alloc_info_t *arg);
 
 void pci_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc);
+void irq_msi_compose_msg(struct irq_data *data, struct msi_msg *msg);
 
 #endif /* _ASM_X86_MSI_H */

arch/x86/include/asm/ps4.h

@@ -0,0 +1,60 @@
+/*
+ * ps4.h: Sony PS4 platform setup code
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; version 2
+ * of the License.
+ */
+#ifndef _ASM_X86_PS4_H
+#define _ASM_X86_PS4_H
+
+#ifdef CONFIG_X86_PS4
+
+#include <linux/irqdomain.h>
+
+#define PS4_DEFAULT_TSC_FREQ 1594000000
+
+#define EMC_TIMER_BASE 0xd0281000
+#define EMC_TIMER_VALUE 0x28
+
+extern unsigned long ps4_calibrate_tsc(void);
+
+/*
+ * The PS4 Aeolia southbridge device is a composite device containing some
+ * standard-ish, some not-so-standard, and some completely custom functions,
+ * all using special MSI handling. This function does the equivalent of
+ * pci_enable_msi_range and friends, for those devices. Only works after the
+ * Aeolia MSR routing function device (function 4) has been probed.
+ * Returns 1 or count, depending on IRQ allocation constraints, or negative on
+ * error. Assigned IRQ(s) start at dev->irq.
+ */
+extern int apcie_assign_irqs(struct pci_dev *dev, int nvec);
+extern void apcie_free_irqs(unsigned int virq, unsigned int nr_irqs);
+
+extern int apcie_status(void);
+extern int apcie_icc_cmd(u8 major, u16 minor, const void *data,
+			 u16 length, void *reply, u16 reply_length);
+
+
+#else
+
+static inline int apcie_assign_irqs(struct pci_dev *dev, int nvec)
+{
+	return -ENODEV;
+}
+static inline void apcie_free_irqs(unsigned int virq, unsigned int nvec)
+{
+}
+static inline int apcie_status(void)
+{
+	return -ENODEV;
+}
+static inline int apcie_icc_cmd(u8 major, u16 minor, const void *data,
+				u16 length, void *reply, u16 reply_length)
+{
+	return -ENODEV;
+}
+
+#endif
+#endif

arch/x86/include/asm/setup.h

@@ -58,6 +58,12 @@ extern void x86_ce4100_early_setup(void);
 static inline void x86_ce4100_early_setup(void) { }
 #endif
 
+#ifdef CONFIG_X86_PS4
+extern void x86_ps4_early_setup(void);
+#else
+static inline void x86_ps4_early_setup(void) { }
+#endif
+
 #ifndef _SETUP
 
 #include <asm/espfix.h>

arch/x86/include/uapi/asm/bootparam.h

@@ -202,6 +202,7 @@ enum x86_hardware_subarch {
 	X86_SUBARCH_XEN,
 	X86_SUBARCH_INTEL_MID,
 	X86_SUBARCH_CE4100,
+	X86_SUBARCH_PS4,
 	X86_NR_SUBARCHS,
 };
 

arch/x86/kernel/apic/msi.c

@@ -25,7 +25,7 @@
 
 static struct irq_domain *msi_default_domain;
 
-static void irq_msi_compose_msg(struct irq_data *data, struct msi_msg *msg)
+void irq_msi_compose_msg(struct irq_data *data, struct msi_msg *msg)
 {
 	struct irq_cfg *cfg = irqd_cfg(data);
 

arch/x86/kernel/head64.c

@@ -192,5 +192,12 @@ void __init x86_64_start_reservations(char *real_mode_data)
 		break;
 	}
 
+	/* Call the subarch specific early setup function */
+	switch (boot_params.hdr.hardware_subarch) {
+	case X86_SUBARCH_PS4:
+		x86_ps4_early_setup();
+		break;
+	}
+
 	start_kernel();
 }

arch/x86/platform/Makefile

@@ -10,6 +10,7 @@ obj-y	+= intel-mid/
 obj-y	+= intel-quark/
 obj-y	+= mellanox/
 obj-y	+= olpc/
+obj-y	+= ps4/
 obj-y	+= scx200/
 obj-y	+= sfi/
 obj-y	+= ts5500/

arch/x86/platform/ps4/Makefile

@@ -0,0 +1 @@
+obj-$(CONFIG_X86_PS4) += ps4.o calibrate.o

arch/x86/platform/ps4/calibrate.c

@@ -0,0 +1,116 @@
+/*
+ * calibrate.c: Sony PS4 TSC/LAPIC calibration
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; version 2
+ * of the License.
+ */
+
+#define pr_fmt(fmt) "ps4: " fmt
+
+#include <linux/jiffies.h>
+#include <asm/io.h>
+#include <asm/msr.h>
+#include <asm/ps4.h>
+#include <asm/delay.h>
+#include <asm/apic.h>
+
+/* The PS4 southbridge (Aeolia) has an EMC timer that ticks at 32.768kHz,
+ * which seems to be an appropriate clock reference for calibration. Both TSC
+ * and the LAPIC timer are based on the core clock frequency and thus can be
+ * calibrated together. */
+static void __iomem *emc_timer = NULL;
+
+static __init inline u32 emctimer_read32(unsigned int reg)
+{
+	return ioread32(emc_timer + reg);
+}
+
+static __init inline void emctimer_write32(unsigned int reg, u32 val)
+{
+	iowrite32(val, emc_timer + reg);
+}
+
+static __init inline u32 emctimer_read(void)
+{
+	u32 t1, t2;
+	t1 = emctimer_read32(EMC_TIMER_VALUE);
+	while (1) {
+		t2 = emctimer_read32(EMC_TIMER_VALUE);
+		if (t1 == t2)
+			return t1;
+		t1 = t2;
+	}
+}
+
+static __init unsigned long ps4_measure_tsc_freq(void)
+{
+	unsigned long ret = 0;
+	u32 t1, t2;
+	u64 tsc1, tsc2;
+
+	// This is part of the Aeolia pcie device, but it's too early to
+	// do this in a driver.
+	emc_timer = ioremap(EMC_TIMER_BASE, 0x100);
+	if (!emc_timer)
+		goto fail;
+
+	// reset/start the timer
+	emctimer_write32(0x84, emctimer_read32(0x84) & (~0x01));
+	// udelay is not calibrated yet, so this is likely wildly off, but good
+	// enough to work.
+	udelay(300);
+	emctimer_write32(0x00, emctimer_read32(0x00) | 0x01);
+	emctimer_write32(0x84, emctimer_read32(0x84) | 0x01);
+
+	t1 = emctimer_read();
+	tsc1 = tsc2 = rdtsc();
+
+	while (emctimer_read() == t1) {
+		// 0.1s timeout should be enough
+		tsc2 = rdtsc();
+		if ((tsc2 - tsc1) > (PS4_DEFAULT_TSC_FREQ/10)) {
+			pr_warn("EMC timer is broken.\n");
+			goto fail;
+		}
+	}
+	pr_info("EMC timer started in %lld TSC ticks\n", tsc2 - tsc1);
+
+	// Wait for a tick boundary
+	t1 = emctimer_read();
+	while ((t2 = emctimer_read()) == t1);
+	tsc1 = rdtsc();
+
+	// Wait for 1024 ticks to elapse (31.25ms)
+	// We don't need to wait very long, as we are looking for transitions.
+	// At this value, a TSC uncertainty of ~50 ticks corresponds to 1ppm of
+	// clock accuracy.
+	while ((emctimer_read() - t2) < 1024);
+	tsc2 = rdtsc();
+
+	// TSC rate is 32 times the elapsed time
+	ret = (tsc2 - tsc1) * 32;
+
+	pr_info("Calibrated TSC frequency: %ld kHz\n", ret);
+fail:
+	if (emc_timer) {
+		iounmap(emc_timer);
+		emc_timer = NULL;
+	}
+	return ret;
+}
+
+unsigned long __init ps4_calibrate_tsc(void)
+{
+	unsigned long tsc_freq = ps4_measure_tsc_freq();
+
+	if (!tsc_freq) {
+		pr_warn("Unable to measure TSC frequency, assuming default.\n");
+		tsc_freq = PS4_DEFAULT_TSC_FREQ;
+	}
+
+	lapic_timer_frequency = (tsc_freq + 8 * HZ) / (16 * HZ);
+
+	return (tsc_freq + 500) / 1000;
+}

arch/x86/platform/ps4/ps4.c

@@ -0,0 +1,76 @@
+/*
+ * ps4.c: Sony PS4 platform setup code
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; version 2
+ * of the License.
+ */
+
+#define pr_fmt(fmt) "ps4: " fmt
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/scatterlist.h>
+#include <linux/sfi.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+
+#include <asm/setup.h>
+#include <asm/mpspec_def.h>
+#include <asm/hw_irq.h>
+#include <asm/apic.h>
+#include <asm/io_apic.h>
+#include <asm/io.h>
+#include <asm/i8259.h>
+#include <asm/apb_timer.h>
+#include <asm/reboot.h>
+#include <asm/msr.h>
+#include <asm/ps4.h>
+
+static bool is_ps4;
+bool apcie_initialized;
+
+/*
+ * The RTC is part of the Aeolia PCI device and will be implemented there as
+ * an RTC class device; stub these out.
+ */
+static void dummy_get_wallclock(struct timespec *now)
+{
+	now->tv_sec = now->tv_nsec = 0;
+}
+static int dummy_set_wallclock(const struct timespec *now)
+{
+	return -ENODEV;
+}
+
+/*
+ * Provide a way for generic drivers to query for the availability of the
+ * PS4 apcie driver/device, which is a dependency for them.
+ */
+int apcie_status(void)
+{
+	if (!is_ps4)
+		return -ENODEV;
+	return apcie_initialized;
+}
+EXPORT_SYMBOL_GPL(apcie_status);
+
+void icc_reboot(void);
+
+/*
+ * PS4 specific x86_init function overrides and early setup calls.
+ */
+void __init x86_ps4_early_setup(void)
+{
+	pr_info("x86_ps4_early_setup: PS4 early setup\n");
+	is_ps4 = true;
+	x86_platform.calibrate_tsc = ps4_calibrate_tsc;
+	x86_platform.get_wallclock = dummy_get_wallclock;
+	x86_platform.set_wallclock = dummy_set_wallclock;
+
+	legacy_pic = &null_legacy_pic;
+	machine_ops.emergency_restart = icc_reboot;
+}

drivers/Makefile

@@ -81,6 +81,7 @@ obj-$(CONFIG_MTD)		+= mtd/
 obj-$(CONFIG_SPI)		+= spi/
 obj-$(CONFIG_SPMI)		+= spmi/
 obj-$(CONFIG_HSI)		+= hsi/
+obj-$(CONFIG_X86_PS4)		+= ps4/
 obj-y				+= net/
 obj-$(CONFIG_ATM)		+= atm/
 obj-$(CONFIG_FUSION)		+= message/