diff mbox series

[v2,10/12] mips: octeon: Initial minimal support for the Marvell Octeon SoC

Message ID 20200514095912.14428-11-sr@denx.de
State New
Headers show
Series mips: Add initial Octeon MIPS64 base support | expand

Commit Message

Stefan Roese May 14, 2020, 9:59 a.m. UTC
From: Aaron Williams <awilliams at marvell.com>

This patch adds very basic support for the Octeon III SoCs. Only
CFI parallel NOR flash and UART is supported for now.

Please note that the basic Octeon port does not include the DDR3/4
initialization yet. This will be added in some follow-up patches
later. To still use U-Boot on with this port, the L2 cache (4MiB on
Octeon III CN73xx) is used as RAM. This way, U-Boot can boot to the
prompt on such boards.

Signed-off-by: Aaron Williams <awilliams at marvell.com>
Signed-off-by: Stefan Roese <sr at denx.de>

---

Changes in v2:
- Remove custom start.S and use common start.S. Minimal custom lowlevel
  init code is currently added in the custom lowlevel_init.S. This needs
  to be extended with necessary code, like errata handling etc. But for
  a very first basic port, this seems to be all thats needed to boot on
  the EBB7304 to the prompt.
- Removed select CREATE_ARCH_SYMLINK
- Removed Octeon II support, as its currently no added in this patchset
- Added cache.c to add the platform specific cache functions as no-ops
  for Octeon as the platform is cache coherent
- Removed CONFIG_MIPS_CACHE_COHERENT
- Added CONFIG_CPU_CAVIUM_OCTEON to Kconfig and selected it for Octeon
  to enable better sync with the Linux files in the future
- Add get_tbclk() -> no need to define CONFIG_SYS_MIPS_TIMER_FREQ any more

 MAINTAINERS                                   |  6 ++
 arch/mips/Kconfig                             | 43 +++++++++++
 arch/mips/Makefile                            |  3 +
 arch/mips/mach-octeon/Kconfig                 | 53 +++++++++++++
 arch/mips/mach-octeon/Makefile                | 10 +++
 arch/mips/mach-octeon/cache.c                 | 20 +++++
 arch/mips/mach-octeon/clock.c                 | 27 +++++++
 arch/mips/mach-octeon/cpu.c                   | 55 ++++++++++++++
 arch/mips/mach-octeon/dram.c                  | 27 +++++++
 arch/mips/mach-octeon/include/ioremap.h       | 30 ++++++++
 arch/mips/mach-octeon/include/mach/cavm-reg.h | 42 +++++++++++
 arch/mips/mach-octeon/include/mach/clock.h    | 24 ++++++
 arch/mips/mach-octeon/lowlevel_init.S         | 75 +++++++++++++++++++
 scripts/config_whitelist.txt                  |  1 -
 14 files changed, 415 insertions(+), 1 deletion(-)
 create mode 100644 arch/mips/mach-octeon/Kconfig
 create mode 100644 arch/mips/mach-octeon/Makefile
 create mode 100644 arch/mips/mach-octeon/cache.c
 create mode 100644 arch/mips/mach-octeon/clock.c
 create mode 100644 arch/mips/mach-octeon/cpu.c
 create mode 100644 arch/mips/mach-octeon/dram.c
 create mode 100644 arch/mips/mach-octeon/include/ioremap.h
 create mode 100644 arch/mips/mach-octeon/include/mach/cavm-reg.h
 create mode 100644 arch/mips/mach-octeon/include/mach/clock.h
 create mode 100644 arch/mips/mach-octeon/lowlevel_init.S
diff mbox series

Patch

diff --git a/MAINTAINERS b/MAINTAINERS
index ec59ce8b88..7f4c325df4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -752,6 +752,12 @@  M:	Ezequiel Garcia <ezequiel at collabora.com>
 S:	Maintained
 F:	arch/mips/mach-jz47xx/
 
+MIPS Octeon
+M:	Aaron Williams <awilliams at marvell.com>
+S:	Maintained
+F:	arch/mips/mach-octeon/
+F:	arch/mips/include/asm/arch-octeon/
+
 MMC
 M:	Peng Fan <peng.fan at nxp.com>
 S:	Maintained
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 48e754cc46..bc5ad0c3ff 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -106,6 +106,25 @@  config ARCH_JZ47XX
 	select OF_CONTROL
 	select DM
 
+config ARCH_OCTEON
+	bool "Support Marvell Octeon CN7xxx platforms"
+	select CPU_CAVIUM_OCTEON
+	select DISPLAY_CPUINFO
+	select DMA_ADDR_T_64BIT
+	select DM
+	select DM_SERIAL
+	select MIPS_INIT_STACK_IN_SRAM
+	select MIPS_L2_CACHE
+	select MIPS_TUNE_OCTEON3
+	select MIPS_SRAM_INIT
+	select ROM_EXCEPTION_VECTORS
+	select SUPPORTS_BIG_ENDIAN
+	select SUPPORTS_CPU_MIPS64_OCTEON
+	select PHYS_64BIT
+	select OF_CONTROL
+	select OF_LIVE
+	imply CMD_DM
+
 config MACH_PIC32
 	bool "Support Microchip PIC32"
 	select DM
@@ -160,6 +179,7 @@  source "arch/mips/mach-bmips/Kconfig"
 source "arch/mips/mach-jz47xx/Kconfig"
 source "arch/mips/mach-pic32/Kconfig"
 source "arch/mips/mach-mtmips/Kconfig"
+source "arch/mips/mach-octeon/Kconfig"
 
 if MIPS
 
@@ -233,6 +253,14 @@  config CPU_MIPS64_R6
 	  Choose this option to build a kernel for release 6 or later of the
 	  MIPS64 architecture.
 
+config CPU_MIPS64_OCTEON
+	bool "Marvell Octeon series of CPUs"
+	depends on SUPPORTS_CPU_MIPS64_OCTEON
+	select 64BIT
+	help
+	 Choose this option for Marvell Octeon CPUs.  These CPUs are between
+	 MIPS64 R5 and R6 with other extensions.
+
 endchoice
 
 menu "General setup"
@@ -398,6 +426,12 @@  config SUPPORTS_CPU_MIPS64_R2
 config SUPPORTS_CPU_MIPS64_R6
 	bool
 
+config SUPPORTS_CPU_MIPS64_OCTEON
+	bool
+
+config CPU_CAVIUM_OCTEON
+	bool
+
 config CPU_MIPS32
 	bool
 	default y if CPU_MIPS32_R1 || CPU_MIPS32_R2 || CPU_MIPS32_R6
@@ -405,6 +439,7 @@  config CPU_MIPS32
 config CPU_MIPS64
 	bool
 	default y if CPU_MIPS64_R1 || CPU_MIPS64_R2 || CPU_MIPS64_R6
+	default y if CPU_MIPS64_OCTEON
 
 config MIPS_TUNE_4KC
 	bool
@@ -421,6 +456,9 @@  config MIPS_TUNE_34KC
 config MIPS_TUNE_74KC
 	bool
 
+config MIPS_TUNE_OCTEON3
+	bool
+
 config 32BIT
 	bool
 
@@ -453,6 +491,11 @@  config MIPS_SRAM_INIT
 	  before it can be used. If enabled, a function mips_sram_init() will
 	  be called just before setup_stack_gd.
 
+config DMA_ADDR_T_64BIT
+	bool
+	help
+	 Select this to enable 64-bit DMA addressing
+
 config SYS_DCACHE_SIZE
 	int
 	default 0
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index af3f227436..6502aebd29 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -17,6 +17,7 @@  machine-$(CONFIG_ARCH_JZ47XX) += jz47xx
 machine-$(CONFIG_MACH_PIC32) += pic32
 machine-$(CONFIG_ARCH_MTMIPS) += mtmips
 machine-$(CONFIG_ARCH_MSCC) += mscc
+machine-${CONFIG_ARCH_OCTEON} += octeon
 
 machdirs := $(patsubst %,arch/mips/mach-%/,$(machine-y))
 libs-y += $(machdirs)
@@ -30,6 +31,7 @@  arch-$(CONFIG_CPU_MIPS32_R6) += -march=mips32r6 -Wa,-mips32r6
 arch-$(CONFIG_CPU_MIPS64_R1) += -march=mips64 -Wa,-mips64
 arch-$(CONFIG_CPU_MIPS64_R2) += -march=mips64r2 -Wa,-mips64r2
 arch-$(CONFIG_CPU_MIPS64_R6) += -march=mips64r6 -Wa,-mips64r6
+arch-${CONFIG_CPU_MIPS64_OCTEON} += -march=octeon2
 
 # Allow extra optimization for specific CPUs/SoCs
 tune-$(CONFIG_MIPS_TUNE_4KC) += -mtune=4kc
@@ -37,6 +39,7 @@  tune-$(CONFIG_MIPS_TUNE_14KC) += -mtune=14kc
 tune-$(CONFIG_MIPS_TUNE_24KC) += -mtune=24kc
 tune-$(CONFIG_MIPS_TUNE_34KC) += -mtune=34kc
 tune-$(CONFIG_MIPS_TUNE_74KC) += -mtune=74kc
+tune-${CONFIG_MIPS_TUNE_OCTEON3} += -mtune=octeon2
 
 # Include default header files
 cflags-y += -I$(srctree)/arch/mips/include/asm/mach-generic
diff --git a/arch/mips/mach-octeon/Kconfig b/arch/mips/mach-octeon/Kconfig
new file mode 100644
index 0000000000..9fd4c6cb0a
--- /dev/null
+++ b/arch/mips/mach-octeon/Kconfig
@@ -0,0 +1,53 @@ 
+menu "Octeon platforms"
+	depends on ARCH_OCTEON
+
+config SYS_SOC
+	string
+	default "octeon"
+
+config OCTEON_CN7XXX
+	bool "Octeon CN7XXX SoC"
+
+config OCTEON_CN70XX
+	bool "Octeon CN70XX SoC"
+	select OCTEON_CN7XXX
+
+config OCTEON_CN73XX
+	bool "Octeon CN73XX SoC"
+	select OCTEON_CN7XXX
+
+config OCTEON_CN78XX
+	bool "Octeon CN78XX SoC"
+	select OCTEON_CN7XXX
+
+choice
+	prompt "Octeon MIPS family select"
+
+config SOC_OCTEON3
+	bool "Octeon III family"
+	help
+	 This selects the Octeon III SoC family CN70xx, CN73XX, CN78xx
+	 and CNF75XX.
+
+endchoice
+
+config SYS_DCACHE_SIZE
+	default 32768
+
+config SYS_DCACHE_LINE_SIZE
+	default 128
+
+config SYS_ICACHE_SIZE
+	default	79872
+
+config SYS_ICACHE_LINE_SIZE
+	default 128
+
+config MIPS_INIT_JUMP_OFFSET
+	hex
+	default 0xffffffffbfc00000
+	help
+	 This specifies the address where U-Boot starts exceution.
+	 In this case its the flash base address of the bootbus.
+
+endmenu
diff --git a/arch/mips/mach-octeon/Makefile b/arch/mips/mach-octeon/Makefile
new file mode 100644
index 0000000000..2e37ca572c
--- /dev/null
+++ b/arch/mips/mach-octeon/Makefile
@@ -0,0 +1,10 @@ 
+# (C) Copyright 2019 Marvell, Inc.
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-y += lowlevel_init.o
+obj-y += cache.o
+obj-y += clock.o
+obj-y += cpu.o
+obj-y += dram.o
diff --git a/arch/mips/mach-octeon/cache.c b/arch/mips/mach-octeon/cache.c
new file mode 100644
index 0000000000..481da3a27a
--- /dev/null
+++ b/arch/mips/mach-octeon/cache.c
@@ -0,0 +1,20 @@ 
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2020 Marvell International Ltd.
+ */
+
+#include <common.h>
+
+/*
+ * The Octeon platform is cache coherent and cache flushes and invalidates
+ * are not needed. Define some platform specific empty flush_foo()
+ * functions here to overwrite the _weak common function as a no-op.
+ * This effectively disables all cache operations.
+ */
+void flush_dcache_range(ulong start_addr, ulong stop)
+{
+}
+
+void flush_cache(ulong start_addr, ulong size)
+{
+}
diff --git a/arch/mips/mach-octeon/clock.c b/arch/mips/mach-octeon/clock.c
new file mode 100644
index 0000000000..2d90c4cbe1
--- /dev/null
+++ b/arch/mips/mach-octeon/clock.c
@@ -0,0 +1,27 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018, 2019 Marvell International Ltd.
+ */
+
+#include <common.h>
+#include <mach/clock.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+ulong notrace get_tbclk(void)
+{
+	return gd->cpu_clk;
+}
+
+int octeon_get_timer_freq(void)
+{
+	return gd->cpu_clk;
+}
+
+/**
+ * Returns the I/O clock speed in Hz
+ */
+u64 octeon_get_io_clock(void)
+{
+	return gd->bus_clk;
+}
diff --git a/arch/mips/mach-octeon/cpu.c b/arch/mips/mach-octeon/cpu.c
new file mode 100644
index 0000000000..15c6769695
--- /dev/null
+++ b/arch/mips/mach-octeon/cpu.c
@@ -0,0 +1,55 @@ 
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2020 Marvell International Ltd.
+ */
+
+#include <common.h>
+#include <linux/io.h>
+#include <mach/clock.h>
+#include <mach/cavm-reg.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int get_clocks(void)
+{
+	const u64 ref_clock = PLL_REF_CLK;
+	union cavm_rst_boot rst_boot;
+
+	rst_boot.u = ioread64(CAVM_RST_BOOT);
+	gd->cpu_clk = ref_clock * rst_boot.s.c_mul;
+	gd->bus_clk = ref_clock * rst_boot.s.pnr_mul;
+
+	debug("%s: cpu: %lu, bus: %lu\n", __func__, gd->cpu_clk, gd->bus_clk);
+
+	return 0;
+}
+
+/* Early mach init code run from flash */
+int mach_cpu_init(void)
+{
+	/* Remap boot-bus 0x1fc0.0000 -> 0x1f40.0000 */
+	/* ToDo: Move this to an early running bus (bootbus) DM driver */
+	clrsetbits_be64(CAVM_MIO_BOOT_REG_CFG0, 0xffff, 0x1f40);
+
+	/* Get clocks and store them in GD */
+	get_clocks();
+
+	return 0;
+}
+
+/**
+ * Returns number of cores
+ *
+ * @return	number of CPU cores for the specified node
+ */
+static int cavm_octeon_num_cores(void)
+{
+	return fls64(ioread64(CAVM_CIU_FUSE) & 0xffffffffffff);
+}
+
+int print_cpuinfo(void)
+{
+	printf("SoC:   Octeon CN73xx (%d cores)\n", cavm_octeon_num_cores());
+
+	return 0;
+}
diff --git a/arch/mips/mach-octeon/dram.c b/arch/mips/mach-octeon/dram.c
new file mode 100644
index 0000000000..2cb8a81a30
--- /dev/null
+++ b/arch/mips/mach-octeon/dram.c
@@ -0,0 +1,27 @@ 
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2020 Marvell International Ltd.
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <ram.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int dram_init(void)
+{
+	/*
+	 * No DDR init yet -> run in L2 cache
+	 */
+	gd->ram_size = (4 << 20);
+	gd->bd->bi_dram[0].size = gd->ram_size;
+	gd->bd->bi_dram[1].size = 0;
+
+	return 0;
+}
+
+ulong board_get_usable_ram_top(ulong total_size)
+{
+	return gd->ram_top;
+}
diff --git a/arch/mips/mach-octeon/include/ioremap.h b/arch/mips/mach-octeon/include/ioremap.h
new file mode 100644
index 0000000000..59b75008a2
--- /dev/null
+++ b/arch/mips/mach-octeon/include/ioremap.h
@@ -0,0 +1,30 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_MACH_OCTEON_IOREMAP_H
+#define __ASM_MACH_OCTEON_IOREMAP_H
+
+#include <linux/types.h>
+
+/*
+ * Allow physical addresses to be fixed up to help peripherals located
+ * outside the low 32-bit range -- generic pass-through version.
+ */
+static inline phys_addr_t fixup_bigphys_addr(phys_addr_t phys_addr,
+					     phys_addr_t size)
+{
+	return phys_addr;
+}
+
+static inline void __iomem *plat_ioremap(phys_addr_t offset, unsigned long size,
+					 unsigned long flags)
+{
+	return (void __iomem *)(XKPHYS | offset);
+}
+
+static inline int plat_iounmap(const volatile void __iomem *addr)
+{
+	return 0;
+}
+
+#define _page_cachable_default	_CACHE_CACHABLE_NONCOHERENT
+
+#endif /* __ASM_MACH_OCTEON_IOREMAP_H */
diff --git a/arch/mips/mach-octeon/include/mach/cavm-reg.h b/arch/mips/mach-octeon/include/mach/cavm-reg.h
new file mode 100644
index 0000000000..b961e54956
--- /dev/null
+++ b/arch/mips/mach-octeon/include/mach/cavm-reg.h
@@ -0,0 +1,42 @@ 
+/* SPDX-License-Identifier:    GPL-2.0 */
+/*
+ * Copyright (C) 2020 Marvell International Ltd.
+ */
+
+#ifndef __CAVM_REG_H__
+
+/* Register offsets */
+#define CAVM_CIU_FUSE			((u64 *)0x80010100000001a0)
+#define CAVM_MIO_BOOT_REG_CFG0		((u64 *)0x8001180000000000)
+#define CAVM_RST_BOOT			((u64 *)0x8001180006001600)
+
+/* Register structs */
+
+/**
+ * Register (RSL) rst_boot
+ *
+ * RST Boot Register
+ */
+union cavm_rst_boot {
+	u64 u;
+	struct cavm_rst_boot_s {
+		u64 chipkill                         : 1;
+		u64 jtcsrdis                         : 1;
+		u64 ejtagdis                         : 1;
+		u64 romen                            : 1;
+		u64 ckill_ppdis                      : 1;
+		u64 jt_tstmode                       : 1;
+		u64 vrm_err                          : 1;
+		u64 reserved_37_56                   : 20;
+		u64 c_mul                            : 7;
+		u64 pnr_mul                          : 6;
+		u64 reserved_21_23                   : 3;
+		u64 lboot_oci                        : 3;
+		u64 lboot_ext                        : 6;
+		u64 lboot                            : 10;
+		u64 rboot                            : 1;
+		u64 rboot_pin                        : 1;
+	} s;
+};
+
+#endif /* __CAVM_REG_H__ */
diff --git a/arch/mips/mach-octeon/include/mach/clock.h b/arch/mips/mach-octeon/include/mach/clock.h
new file mode 100644
index 0000000000..a844a222c9
--- /dev/null
+++ b/arch/mips/mach-octeon/include/mach/clock.h
@@ -0,0 +1,24 @@ 
+/* SPDX-License-Identifier:    GPL-2.0 */
+/*
+ * Copyright (C) 2018, 2019 Marvell International Ltd.
+ *
+ * https://spdx.org/licenses
+ */
+
+#ifndef __CLOCK_H__
+
+/** System PLL reference clock */
+#define PLL_REF_CLK                     50000000        /* 50 MHz */
+#define NS_PER_REF_CLK_TICK             (1000000000 / PLL_REF_CLK)
+
+/**
+ * Returns the I/O clock speed in Hz
+ */
+u64 octeon_get_io_clock(void);
+
+/**
+ * Returns the core clock speed in Hz
+ */
+u64 octeon_get_core_clock(void);
+
+#endif /* __CLOCK_H__ */
diff --git a/arch/mips/mach-octeon/lowlevel_init.S b/arch/mips/mach-octeon/lowlevel_init.S
new file mode 100644
index 0000000000..ea90e6b8d6
--- /dev/null
+++ b/arch/mips/mach-octeon/lowlevel_init.S
@@ -0,0 +1,75 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020 Marvell International Ltd.
+ */
+
+#include <config.h>
+#include <asm-offsets.h>
+#include <asm/cacheops.h>
+#include <asm/regdef.h>
+#include <asm/mipsregs.h>
+#include <asm/addrspace.h>
+#include <asm/asm.h>
+
+	.set noreorder
+
+LEAF(mips_sram_init)
+
+        move    s0, ra
+
+	bal	__dummy
+	 nop
+
+__dummy:
+	/* Get the actual address that we are running at */
+	PTR_LA	a6, _start		/* Linked address of _start */
+	PTR_LA	a7, __dummy
+	dsubu	t1, a7, a6		/* offset of __dummy label from _start*/
+	dsubu	t0, ra, t1		/* t0 now has actual address of _start*/
+
+	PTR_LI	t1, CONFIG_SYS_TEXT_BASE
+
+	/* Calculate end address of copy loop */
+	PTR_LI	s5, CONFIG_BOARD_SIZE_LIMIT
+	daddu	t2, s5, t0	/* t2 = end address */
+	daddiu	t2, t2, 127
+	ins	t2, zero, 0, 7	/* Round up to cache line for memcpy */
+
+	/* Copy ourself to the L2 cache from flash, 32 bytes at a time */
+1:
+	ld	a0, 0(t0)
+	ld	a1, 8(t0)
+	ld	a2, 16(t0)
+	ld	a3, 24(t0)
+	sd	a0, 0(t1)
+	sd	a1, 8(t1)
+	sd	a2, 16(t1)
+	sd	a3, 24(t1)
+	addiu	t0, 32
+	bne	t0, t2, 1b
+	addiu	t1, 32
+
+	sync
+	synci	0(zero)
+
+	PTR_LA	t9, uboot_in_cache
+	j	t9
+	 nop
+
+uboot_in_cache:
+
+	/*
+	 * Return to start.S now running from TEXT_BASE, which points
+	 * to DRAM address space, which effectively is L2 cache now.
+	 * This speeds up the init process extremely, especially the
+	 * DDR init code.
+	 */
+	jr	s0
+	 nop
+
+	END(mips_sram_init)
+
+LEAF(lowlevel_init)
+	jr	ra
+	 nop
+	END(lowlevel_init)
diff --git a/scripts/config_whitelist.txt b/scripts/config_whitelist.txt
index 253c46159b..e254c11d66 100644
--- a/scripts/config_whitelist.txt
+++ b/scripts/config_whitelist.txt
@@ -234,7 +234,6 @@  CONFIG_CPLD_BR_PRELIM
 CONFIG_CPLD_OR_PRELIM
 CONFIG_CPM2
 CONFIG_CPU_ARMV8
-CONFIG_CPU_CAVIUM_OCTEON
 CONFIG_CPU_FREQ_HZ
 CONFIG_CPU_HAS_LLSC
 CONFIG_CPU_HAS_PREFETCH