MIPS: add support for SGI Octane (IP30)

This changeset adds support for SGI Octane/Octane2 workstations.

Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Signed-off-by: Paul Burton <paulburton@kernel.org>
Cc: Paul Burton <paul.burton@mips.com>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org

arch/mips/Kbuild.platforms

@@ -31,6 +31,7 @@ platforms += ralink
 platforms += rb532
 platforms += sgi-ip22
 platforms += sgi-ip27
+platforms += sgi-ip30
 platforms += sgi-ip32
 platforms += sibyte
 platforms += sni

arch/mips/Kconfig

@@ -755,6 +755,33 @@ config SGI_IP28
 	  This is the SGI Indigo2 with R10000 processor.  To compile a Linux
 	  kernel that runs on these, say Y here.
 
+config SGI_IP30
+	bool "SGI IP30 (Octane/Octane2)"
+	select ARCH_HAS_PHYS_TO_DMA
+	select FW_ARC
+	select FW_ARC64
+	select BOOT_ELF64
+	select CEVT_R4K
+	select CSRC_R4K
+	select SYNC_R4K if SMP
+	select ZONE_DMA32
+	select HAVE_PCI
+	select IRQ_MIPS_CPU
+	select IRQ_DOMAIN_HIERARCHY
+	select NR_CPUS_DEFAULT_2
+	select PCI_DRIVERS_GENERIC
+	select PCI_XTALK_BRIDGE
+	select SYS_HAS_EARLY_PRINTK
+	select SYS_HAS_CPU_R10000
+	select SYS_SUPPORTS_64BIT_KERNEL
+	select SYS_SUPPORTS_BIG_ENDIAN
+	select SYS_SUPPORTS_SMP
+	select MIPS_L1_CACHE_SHIFT_7
+	select ARC_MEMORY
+	help
+	  These are the SGI Octane and Octane2 graphics workstations.  To
+	  compile a Linux kernel that runs on these, say Y here.
+
 config SGI_IP32
 	bool "SGI IP32 (O2)"
 	select ARC_MEMORY

arch/mips/include/asm/mach-ip30/cpu-feature-overrides.h

@@ -0,0 +1,83 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * IP30/Octane cpu-features overrides.
+ *
+ * Copyright (C) 2003 Ralf Baechle <ralf@linux-mips.org>
+ *		 2004-2007 Stanislaw Skowronek <skylark@unaligned.org>
+ *		 2009 Johannes Dickgreber <tanzy@gmx.de>
+ *		 2015 Joshua Kinard <kumba@gentoo.org>
+ *
+ */
+#ifndef __ASM_MACH_IP30_CPU_FEATURE_OVERRIDES_H
+#define __ASM_MACH_IP30_CPU_FEATURE_OVERRIDES_H
+
+#include <asm/cpu.h>
+
+/*
+ * IP30 only supports R1[024]000 processors, all using the same config
+ */
+#define cpu_has_tlb			1
+#define cpu_has_tlbinv			0
+#define cpu_has_segments		0
+#define cpu_has_eva			0
+#define cpu_has_htw			0
+#define cpu_has_rixiex			0
+#define cpu_has_maar			0
+#define cpu_has_rw_llb			0
+#define cpu_has_3kex			0
+#define cpu_has_4kex			1
+#define cpu_has_3k_cache		0
+#define cpu_has_4k_cache		1
+#define cpu_has_6k_cache		0
+#define cpu_has_8k_cache		0
+#define cpu_has_tx39_cache		0
+#define cpu_has_fpu			1
+#define cpu_has_nofpuex			0
+#define cpu_has_32fpr			1
+#define cpu_has_counter			1
+#define cpu_has_watch			1
+#define cpu_has_64bits			1
+#define cpu_has_divec			0
+#define cpu_has_vce			0
+#define cpu_has_cache_cdex_p		0
+#define cpu_has_cache_cdex_s		0
+#define cpu_has_prefetch		1
+#define cpu_has_mcheck			0
+#define cpu_has_ejtag			0
+#define cpu_has_llsc			1
+#define cpu_has_mips16			0
+#define cpu_has_mdmx			0
+#define cpu_has_mips3d			0
+#define cpu_has_smartmips		0
+#define cpu_has_rixi			0
+#define cpu_has_xpa			0
+#define cpu_has_vtag_icache		0
+#define cpu_has_dc_aliases		0
+#define cpu_has_ic_fills_f_dc		0
+
+#define cpu_icache_snoops_remote_store	1
+
+#define cpu_has_mips32r1		0
+#define cpu_has_mips32r2		0
+#define cpu_has_mips64r1		0
+#define cpu_has_mips64r2		0
+#define cpu_has_mips32r6		0
+#define cpu_has_mips64r6		0
+
+#define cpu_has_dsp			0
+#define cpu_has_dsp2			0
+#define cpu_has_mipsmt			0
+#define cpu_has_userlocal		0
+#define cpu_has_inclusive_pcaches	1
+#define cpu_hwrena_impl_bits		0
+#define cpu_has_perf_cntr_intr_bit	0
+#define cpu_has_vz			0
+#define cpu_has_fre			0
+#define cpu_has_cdmm			0
+
+#define cpu_dcache_line_size()		32
+#define cpu_icache_line_size()		64
+#define cpu_scache_line_size()		128
+
+#endif /* __ASM_MACH_IP30_CPU_FEATURE_OVERRIDES_H */
+

arch/mips/include/asm/mach-ip30/irq.h

@@ -0,0 +1,87 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * HEART IRQ defines
+ *
+ * Copyright (C) 2009 Johannes Dickgreber <tanzy@gmx.de>
+ *		 2014-2016 Joshua Kinard <kumba@gentoo.org>
+ *
+ */
+
+#ifndef __ASM_MACH_IP30_IRQ_H
+#define __ASM_MACH_IP30_IRQ_H
+
+/*
+ * HEART has 64 hardware interrupts, but use 128 to leave room for a few
+ * software interrupts as well (such as the CPU timer interrupt.
+ */
+#define NR_IRQS				128
+
+extern void __init ip30_install_ipi(void);
+
+/*
+ * HEART has 64 interrupt vectors available to it, subdivided into five
+ * priority levels.  They are numbered 0 to 63.
+ */
+#define HEART_NUM_IRQS			64
+
+/*
+ * These are the five interrupt priority levels and their corresponding
+ * CPU IPx interrupt pins.
+ *
+ * Level 4 - Error Interrupts.
+ * Level 3 - HEART timer interrupt.
+ * Level 2 - CPU IPI, CPU debug, power putton, general device interrupts.
+ * Level 1 - General device interrupts.
+ * Level 0 - General device GFX flow control interrupts.
+ */
+#define HEART_L4_INT_MASK		0xfff8000000000000ULL	/* IP6 */
+#define HEART_L3_INT_MASK		0x0004000000000000ULL	/* IP5 */
+#define HEART_L2_INT_MASK		0x0003ffff00000000ULL	/* IP4 */
+#define HEART_L1_INT_MASK		0x00000000ffff0000ULL	/* IP3 */
+#define HEART_L0_INT_MASK		0x000000000000ffffULL	/* IP2 */
+
+/* HEART L0 Interrupts (Low Priority) */
+#define HEART_L0_INT_GENERIC		 0
+#define HEART_L0_INT_FLOW_CTRL_HWTR_0	 1
+#define HEART_L0_INT_FLOW_CTRL_HWTR_1	 2
+
+/* HEART L2 Interrupts (High Priority) */
+#define HEART_L2_INT_RESCHED_CPU_0	46
+#define HEART_L2_INT_RESCHED_CPU_1	47
+#define HEART_L2_INT_CALL_CPU_0		48
+#define HEART_L2_INT_CALL_CPU_1		49
+
+/* HEART L3 Interrupts (Compare/Counter Timer) */
+#define HEART_L3_INT_TIMER		50
+
+/* HEART L4 Interrupts (Errors) */
+#define HEART_L4_INT_XWID_ERR_9		51
+#define HEART_L4_INT_XWID_ERR_A		52
+#define HEART_L4_INT_XWID_ERR_B		53
+#define HEART_L4_INT_XWID_ERR_C		54
+#define HEART_L4_INT_XWID_ERR_D		55
+#define HEART_L4_INT_XWID_ERR_E		56
+#define HEART_L4_INT_XWID_ERR_F		57
+#define HEART_L4_INT_XWID_ERR_XBOW	58
+#define HEART_L4_INT_CPU_BUS_ERR_0	59
+#define HEART_L4_INT_CPU_BUS_ERR_1	60
+#define HEART_L4_INT_CPU_BUS_ERR_2	61
+#define HEART_L4_INT_CPU_BUS_ERR_3	62
+#define HEART_L4_INT_HEART_EXCP		63
+
+/*
+ * Power Switch is wired via BaseIO BRIDGE slot #6.
+ *
+ * ACFail is wired via BaseIO BRIDGE slot #7.
+ */
+#define IP30_POWER_IRQ		HEART_L2_INT_POWER_BTN
+
+#include_next <irq.h>
+
+#define IP30_HEART_L0_IRQ	(MIPS_CPU_IRQ_BASE + 2)
+#define IP30_HEART_L1_IRQ	(MIPS_CPU_IRQ_BASE + 3)
+#define IP30_HEART_L2_IRQ	(MIPS_CPU_IRQ_BASE + 4)
+#define IP30_HEART_TIMER_IRQ	(MIPS_CPU_IRQ_BASE + 5)
+#define IP30_HEART_ERR_IRQ	(MIPS_CPU_IRQ_BASE + 6)
+
+#endif /* __ASM_MACH_IP30_IRQ_H */

arch/mips/include/asm/mach-ip30/kernel-entry-init.h

@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __ASM_MACH_IP30_KERNEL_ENTRY_H
+#define __ASM_MACH_IP30_KERNEL_ENTRY_H
+
+	.macro  kernel_entry_setup
+	.endm
+
+	.macro	smp_slave_setup
+	move	gp, a0
+	.endm
+
+#endif /* __ASM_MACH_IP30_KERNEL_ENTRY_H */

arch/mips/include/asm/mach-ip30/mangle-port.h

@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2003, 2004 Ralf Baechle
+ */
+#ifndef __ASM_MACH_IP30_MANGLE_PORT_H
+#define __ASM_MACH_IP30_MANGLE_PORT_H
+
+#define __swizzle_addr_b(port)	((port)^3)
+#define __swizzle_addr_w(port)	((port)^2)
+#define __swizzle_addr_l(port)	(port)
+#define __swizzle_addr_q(port)	(port)
+
+#define ioswabb(a, x)		(x)
+#define __mem_ioswabb(a, x)	(x)
+#define ioswabw(a, x)		(x)
+#define __mem_ioswabw(a, x)	cpu_to_le16(x)
+#define ioswabl(a, x)		(x)
+#define __mem_ioswabl(a, x)	cpu_to_le32(x)
+#define ioswabq(a, x)		(x)
+#define __mem_ioswabq(a, x)	cpu_to_le64(x)
+
+#endif /* __ASM_MACH_IP30_MANGLE_PORT_H */

arch/mips/include/asm/mach-ip30/spaces.h

@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2016 Joshua Kinard <kumba@gentoo.org>
+ *
+ */
+#ifndef _ASM_MACH_IP30_SPACES_H
+#define _ASM_MACH_IP30_SPACES_H
+
+/*
+ * Memory in IP30/Octane is offset 512MB in the physical address space.
+ */
+#define PHYS_OFFSET	_AC(0x20000000, UL)
+
+#ifdef CONFIG_64BIT
+#define CAC_BASE	_AC(0xA800000000000000, UL)
+#endif
+
+#include <asm/mach-generic/spaces.h>
+
+#endif /* _ASM_MACH_IP30_SPACES_H */

arch/mips/include/asm/mach-ip30/war.h

@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2002, 2004, 2007 by Ralf Baechle <ralf@linux-mips.org>
+ */
+#ifndef __ASM_MIPS_MACH_IP30_WAR_H
+#define __ASM_MIPS_MACH_IP30_WAR_H
+
+#define R4600_V1_INDEX_ICACHEOP_WAR	0
+#define R4600_V1_HIT_CACHEOP_WAR	0
+#define R4600_V2_HIT_CACHEOP_WAR	0
+#define MIPS_CACHE_SYNC_WAR		0
+#define BCM1250_M3_WAR			0
+#define SIBYTE_1956_WAR			0
+#define MIPS4K_ICACHE_REFILL_WAR	0
+#define MIPS34K_MISSED_ITLB_WAR		0
+#define R5432_CP0_INTERRUPT_WAR		0
+#define TX49XX_ICACHE_INDEX_INV_WAR	0
+#define ICACHE_REFILLS_WORKAROUND_WAR	0
+
+#ifdef CONFIG_CPU_R10000
+#define R10000_LLSC_WAR			1
+#else
+#define R10000_LLSC_WAR			0
+#endif
+
+#endif /* __ASM_MIPS_MACH_IP30_WAR_H */