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[PATCH 4/5] MIPS: Add support for the IMG Pistachio SoC

To: Ralf Baechle <ralf@linux-mips.org>
Subject: [PATCH 4/5] MIPS: Add support for the IMG Pistachio SoC
From: Andrew Bresticker <abrestic@chromium.org>
Date: Mon, 23 Feb 2015 17:31:46 -0800
Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mips@linux-mips.org, Andrew Bresticker <abrestic@chromium.org>, Ezequiel Garcia <ezequiel.garcia@imgtec.com>, James Hartley <james.hartley@imgtec.com>, James Hogan <james.hogan@imgtec.com>
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Add initial support for boards based on the Imagination Pistachio SoC.
Pistachio is based on a dual-core MIPS interAptiv CPU and will boot
using device-tree.

Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
---
 arch/mips/Kbuild.platforms                  |   1 +
 arch/mips/Kconfig                           |  27 ++++++
 arch/mips/include/asm/mach-pistachio/gpio.h |  21 +++++
 arch/mips/include/asm/mach-pistachio/irq.h  |  18 ++++
 arch/mips/pistachio/Makefile                |   1 +
 arch/mips/pistachio/Platform                |   8 ++
 arch/mips/pistachio/init.c                  | 131 ++++++++++++++++++++++++++++
 arch/mips/pistachio/irq.c                   |  28 ++++++
 arch/mips/pistachio/time.c                  |  52 +++++++++++
 9 files changed, 287 insertions(+)
 create mode 100644 arch/mips/include/asm/mach-pistachio/gpio.h
 create mode 100644 arch/mips/include/asm/mach-pistachio/irq.h
 create mode 100644 arch/mips/pistachio/Makefile
 create mode 100644 arch/mips/pistachio/Platform
 create mode 100644 arch/mips/pistachio/init.c
 create mode 100644 arch/mips/pistachio/irq.c
 create mode 100644 arch/mips/pistachio/time.c

diff --git a/arch/mips/Kbuild.platforms b/arch/mips/Kbuild.platforms
index e5fc463..2298baa 100644
--- a/arch/mips/Kbuild.platforms
+++ b/arch/mips/Kbuild.platforms
@@ -23,6 +23,7 @@ platforms += netlogic
 platforms += paravirt
 platforms += pmcs-msp71xx
 platforms += pnx833x
+platforms += pistachio
 platforms += ralink
 platforms += rb532
 platforms += sgi-ip22
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index c7a1690..343b238 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -352,6 +352,33 @@ config MACH_LOONGSON1
          the ICT (Institute of Computing Technology) and the Chinese Academy
          of Sciences.
 
+config MACH_PISTACHIO
+       bool "IMG Pistachio SoC based boards"
+       select ARCH_REQUIRE_GPIOLIB
+       select BOOT_ELF32
+       select BOOT_RAW
+       select CEVT_R4K
+       select CLKSRC_MIPS_GIC
+       select COMMON_CLK
+       select CSRC_R4K
+       select DMA_MAYBE_COHERENT
+       select IRQ_CPU
+       select LIBFDT
+       select MFD_SYSCON
+       select MIPS_CPU_SCACHE
+       select MIPS_GIC
+       select PINCTRL
+       select REGULATOR
+       select SYS_HAS_CPU_MIPS32_R2
+       select SYS_SUPPORTS_32BIT_KERNEL
+       select SYS_SUPPORTS_LITTLE_ENDIAN
+       select SYS_SUPPORTS_MIPS_CPS
+       select SYS_SUPPORTS_MULTITHREADING
+       select SYS_SUPPORTS_ZBOOT
+       select USE_OF
+       help
+         This enables support for the IMG Pistachio SoC platform.
+
 config MIPS_MALTA
        bool "MIPS Malta board"
        select ARCH_MAY_HAVE_PC_FDC
diff --git a/arch/mips/include/asm/mach-pistachio/gpio.h 
b/arch/mips/include/asm/mach-pistachio/gpio.h
new file mode 100644
index 0000000..6c1649c
--- /dev/null
+++ b/arch/mips/include/asm/mach-pistachio/gpio.h
@@ -0,0 +1,21 @@
+/*
+ * Pistachio IRQ setup
+ *
+ * Copyright (C) 2014 Google, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+
+#ifndef __ASM_MACH_PISTACHIO_GPIO_H
+#define __ASM_MACH_PISTACHIO_GPIO_H
+
+#include <asm-generic/gpio.h>
+
+#define gpio_get_value __gpio_get_value
+#define gpio_set_value __gpio_set_value
+#define gpio_cansleep  __gpio_cansleep
+#define gpio_to_irq    __gpio_to_irq
+
+#endif /* __ASM_MACH_PISTACHIO_GPIO_H */
diff --git a/arch/mips/include/asm/mach-pistachio/irq.h 
b/arch/mips/include/asm/mach-pistachio/irq.h
new file mode 100644
index 0000000..b94a09a
--- /dev/null
+++ b/arch/mips/include/asm/mach-pistachio/irq.h
@@ -0,0 +1,18 @@
+/*
+ * Pistachio IRQ setup
+ *
+ * Copyright (C) 2014 Google, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+
+#ifndef __ASM_MACH_PISTACHIO_IRQ_H
+#define __ASM_MACH_PISTACHIO_IRQ_H
+
+#define NR_IRQS 256
+
+#include_next <irq.h>
+
+#endif /* __ASM_MACH_PISTACHIO_IRQ_H */
diff --git a/arch/mips/pistachio/Makefile b/arch/mips/pistachio/Makefile
new file mode 100644
index 0000000..32189c6
--- /dev/null
+++ b/arch/mips/pistachio/Makefile
@@ -0,0 +1 @@
+obj-y  += init.o irq.o time.o
diff --git a/arch/mips/pistachio/Platform b/arch/mips/pistachio/Platform
new file mode 100644
index 0000000..d80cd61
--- /dev/null
+++ b/arch/mips/pistachio/Platform
@@ -0,0 +1,8 @@
+#
+# IMG Pistachio SoC
+#
+platform-$(CONFIG_MACH_PISTACHIO)      += pistachio/
+cflags-$(CONFIG_MACH_PISTACHIO)                +=                              
\
+               -I$(srctree)/arch/mips/include/asm/mach-pistachio
+load-$(CONFIG_MACH_PISTACHIO)          += 0xffffffff80400000
+zload-$(CONFIG_MACH_PISTACHIO)         += 0xffffffff81000000
diff --git a/arch/mips/pistachio/init.c b/arch/mips/pistachio/init.c
new file mode 100644
index 0000000..0c3bd72
--- /dev/null
+++ b/arch/mips/pistachio/init.c
@@ -0,0 +1,131 @@
+/*
+ * Pistachio platform setup
+ *
+ * Copyright (C) 2014 Google, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/of_address.h>
+#include <linux/of_fdt.h>
+#include <linux/of_platform.h>
+
+#include <asm/cacheflush.h>
+#include <asm/dma-coherence.h>
+#include <asm/fw/fw.h>
+#include <asm/mips-boards/generic.h>
+#include <asm/mips-cm.h>
+#include <asm/mips-cpc.h>
+#include <asm/prom.h>
+#include <asm/smp-ops.h>
+#include <asm/traps.h>
+
+const char *get_system_type(void)
+{
+       return "IMG Pistachio SoC";
+}
+
+static void __init plat_setup_iocoherency(void)
+{
+       /*
+        * Kernel has been configured with software coherency
+        * but we might choose to turn it off and use hardware
+        * coherency instead.
+        */
+       if (mips_cm_numiocu() != 0) {
+               /* Nothing special needs to be done to enable coherency */
+               pr_info("CMP IOCU detected\n");
+               hw_coherentio = 1;
+               if (coherentio == 0)
+                       pr_info("Hardware DMA cache coherency disabled\n");
+               else
+                       pr_info("Hardware DMA cache coherency enabled\n");
+       } else {
+               if (coherentio == 1)
+                       pr_info("Hardware DMA cache coherency unsupported, but 
enabled from command line!\n");
+               else
+                       pr_info("Software DMA cache coherency enabled\n");
+       }
+}
+
+void __init plat_mem_setup(void)
+{
+       if (fw_arg0 != 0 || fw_arg1 != 0xffffffff)
+               panic("Device-tree not present");
+
+       __dt_setup_arch(phys_to_virt(fw_arg2));
+       strlcpy(arcs_cmdline, boot_command_line, COMMAND_LINE_SIZE);
+
+       plat_setup_iocoherency();
+}
+
+#define DEFAULT_CPC_BASE_ADDR 0x1bde0000
+
+phys_addr_t mips_cpc_default_phys_base(void)
+{
+       return DEFAULT_CPC_BASE_ADDR;
+}
+
+static void __init mips_nmi_setup(void)
+{
+       void *base;
+       extern char except_vec_nmi;
+
+       base = cpu_has_veic ?
+               (void *)(CAC_BASE + 0xa80) :
+               (void *)(CAC_BASE + 0x380);
+       memcpy(base, &except_vec_nmi, 0x80);
+       flush_icache_range((unsigned long)base,
+                          (unsigned long)base + 0x80);
+}
+
+static void __init mips_ejtag_setup(void)
+{
+       void *base;
+       extern char except_vec_ejtag_debug;
+
+       base = cpu_has_veic ?
+               (void *)(CAC_BASE + 0xa00) :
+               (void *)(CAC_BASE + 0x300);
+       memcpy(base, &except_vec_ejtag_debug, 0x80);
+       flush_icache_range((unsigned long)base,
+                          (unsigned long)base + 0x80);
+}
+
+void __init prom_init(void)
+{
+       board_nmi_handler_setup = mips_nmi_setup;
+       board_ejtag_handler_setup = mips_ejtag_setup;
+
+       mips_cm_probe();
+       mips_cpc_probe();
+       register_cps_smp_ops();
+}
+
+void __init prom_free_prom_memory(void)
+{
+}
+
+void __init device_tree_init(void)
+{
+       if (!initial_boot_params)
+               return;
+
+       unflatten_and_copy_device_tree();
+}
+
+static int __init plat_of_setup(void)
+{
+       if (!of_have_populated_dt())
+               panic("Device tree not present");
+
+       if (of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL))
+               panic("Failed to populate DT\n");
+
+       return 0;
+}
+arch_initcall(plat_of_setup);
diff --git a/arch/mips/pistachio/irq.c b/arch/mips/pistachio/irq.c
new file mode 100644
index 0000000..0a6b24c
--- /dev/null
+++ b/arch/mips/pistachio/irq.c
@@ -0,0 +1,28 @@
+/*
+ * Pistachio IRQ setup
+ *
+ * Copyright (C) 2014 Google, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <linux/irqchip.h>
+#include <linux/irqchip/mips-gic.h>
+#include <linux/kernel.h>
+
+#include <asm/cpu-features.h>
+#include <asm/irq_cpu.h>
+
+void __init arch_init_irq(void)
+{
+       pr_info("EIC is %s\n", cpu_has_veic ? "on" : "off");
+       pr_info("VINT is %s\n", cpu_has_vint ? "on" : "off");
+
+       if (!cpu_has_veic)
+               mips_cpu_irq_init();
+
+       irqchip_init();
+}
diff --git a/arch/mips/pistachio/time.c b/arch/mips/pistachio/time.c
new file mode 100644
index 0000000..67889fc
--- /dev/null
+++ b/arch/mips/pistachio/time.c
@@ -0,0 +1,52 @@
+/*
+ * Pistachio clocksource/timer setup
+ *
+ * Copyright (C) 2014 Google, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/clocksource.h>
+#include <linux/init.h>
+#include <linux/irqchip/mips-gic.h>
+#include <linux/of.h>
+
+#include <asm/time.h>
+
+unsigned int get_c0_compare_int(void)
+{
+       return gic_get_c0_compare_int();
+}
+
+int get_c0_perfcount_int(void)
+{
+       return gic_get_c0_perfcount_int();
+}
+
+void __init plat_time_init(void)
+{
+       struct device_node *np;
+       struct clk *clk;
+
+       of_clk_init(NULL);
+       clocksource_of_init();
+
+       np = of_get_cpu_node(0, NULL);
+       if (!np) {
+               pr_err("Failed to get CPU node\n");
+               return;
+       }
+
+       clk = of_clk_get(np, 0);
+       if (IS_ERR(clk)) {
+               pr_err("Failed to get CPU clock: %ld\n", PTR_ERR(clk));
+               return;
+       }
+
+       mips_hpt_frequency = clk_get_rate(clk) / 2;
+       clk_put(clk);
+}
-- 
2.2.0.rc0.207.ga3a616c


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