Add generic-nios2 machine to meta-altera

Add support for the Altera NIOS2 architecture and a generic machine config.
Also add Linux kernel defconfig for linux-yocto 4.1 package.

Heavily based on work by Walter Goossens <waltergoossens@home.nl>

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Khem Raj <raj.khem@gmail.com>
Cc: Ley Foon Tan <lftan@altera.com>
Cc: Thomas Chou <thomas@wytron.com.tw>
Cc: Walter Goossens <waltergoossens@home.nl>
Cc: Yves Vandervennet <yvanderv@opensource.altera.com>

4 files changed, 49 insertions, 0 deletions

diff --git a/conf/machine/include/nios2/feature-nios2-divide.inc b/conf/machine/include/nios2/feature-nios2-divide.inc
new file mode 100644
index 0000000..5a29570
--- /dev/null
+++ b/conf/machine/include/nios2/feature-nios2-divide.inc
@@ -0,0 +1,4 @@
+TUNEVALID[hw-div] = "Enable Nios2 hardware divider."
+NIOS2CCARGSDIV = "${@bb.utils.contains("TUNE_FEATURES", "hw-div", "-mhw-div", "" ,d)}"
+NIOS2PKGDIV = "${@bb.utils.contains("TUNE_FEATURES", "hw-div", "-div", "" ,d)}"
+
diff --git a/conf/machine/include/nios2/feature-nios2-fpu.inc b/conf/machine/include/nios2/feature-nios2-fpu.inc
new file mode 100644
index 0000000..5baeb40
--- /dev/null
+++ b/conf/machine/include/nios2/feature-nios2-fpu.inc
@@ -0,0 +1,15 @@
+TARGET_FPU = "fpu-other"
+
+TUNEVALID[fpu-soft] = "Use Nios2 software FPU"
+TUNEVALID[fpu-custom] = "Enable Nios2 hardware FPU"
+TUNEVALID[fpu-customdiv] = "Enable Nios2 hardware FPU with divider"
+
+# Establish which fpu is configured in TUNE_FEATURES. Soft is the default for gcc.
+NIOS2CCARGSFPU_BASIC = "${@bb.utils.contains("TUNE_FEATURES", "fpu-custom", "-mcustom-fpu-cfg=60-1", "", d)}"
+NIOS2CCARGSFPU = "${@bb.utils.contains("TUNE_FEATURES", "fpu-customdiv", "-mcustom-fpu-cfg=60-2", "${NIOS2CCARGSFPU_BASIC}", d)}"
+
+NIOS2PKGFPU_BASIC = "${@bb.utils.contains("TUNE_FEATURES", "fpu-custom", "-fpu", "", d)}"
+NIOS2PKGFPU = "${@bb.utils.contains("TUNE_FEATURES", "fpu-customdiv", "-fpudiv", "${NIOS2PKGFPU_BASIC}", d)}"
+
+TUNECONFLICTS[fpu-custom] = "fpu-soft fpu-customdiv"
+TUNECONFLICTS[fpu-customdiv] = "fpu-soft fpu-custom"
diff --git a/conf/machine/include/nios2/feature-nios2-multiply.inc b/conf/machine/include/nios2/feature-nios2-multiply.inc
new file mode 100644
index 0000000..3dc2ccb
--- /dev/null
+++ b/conf/machine/include/nios2/feature-nios2-multiply.inc
@@ -0,0 +1,10 @@
+TUNEVALID[hw-mul] = "Enable Nios2 Hardware Multiply"
+TUNEVALID[hw-mulx] = "Enable Nios2 Extended Hardware Multiply"
+
+# Establish which Multiply output result size to use
+NIOS2CCARGSMUL = "${@bb.utils.contains("TUNE_FEATURES", "hw-mul", "-mhw-mul", "" ,d)}"
+NIOS2CCARGSMUL += "${@bb.utils.contains("TUNE_FEATURES", "hw-mulx", "-mhw-mulx", "" ,d)}"
+
+NIOS2PKGMUL_BASIC = "${@bb.utils.contains("TUNE_FEATURES", "hw-mul", "-mul", "" ,d)}"
+NIOS2PKGMUL = "${@bb.utils.contains("TUNE_FEATURES", "hw-mulx", "-mulx", "${NIOS2PKGMUL_BASIC}" ,d)}"
+
diff --git a/conf/machine/include/tune-nios2.inc b/conf/machine/include/tune-nios2.inc
new file mode 100644
index 0000000..4a132a4
--- /dev/null
+++ b/conf/machine/include/tune-nios2.inc
@@ -0,0 +1,20 @@
+#@TYPE: Machine configuration
+#@NAME: nios2
+
+DEFAULTTUNE ?= "nios2"
+
+TUNE_ARCH = "nios2el"
+
+require conf/machine/include/nios2/feature-nios2-multiply.inc
+require conf/machine/include/nios2/feature-nios2-divide.inc
+require conf/machine/include/nios2/feature-nios2-fpu.inc
+
+AVAILTUNES += "nios2"
+TUNEVALID[nios2] = "nios2"
+TUNE_FEATURES_tune-nios2 += "nios2"
+
+TUNE_CCARGS += "-mel ${NIOS2CCARGSDIV} ${NIOS2CCARGSFPU} ${NIOS2CCARGSMUL}"
+TUNE_PKGARCH = "nios2${NIOS2PKGMUL}${NIOS2PKGDIV}${NIOS2PKGFPU}"
+PACKAGE_EXTRA_ARCHS_tune-nios2 = "${TUNE_PKGARCH}"
+
+CSL_TARGET_SYS_nios2 = "nios2-linux-gnu"