C6X: add basic support for TMS320C6678 SoC

This patch adds support for the TMS320C6678 SoC on an EVMC6678LE
evaluation board. The 6678 is a C66x family CPU which is very similar
to the already supported C64x CPUs with the addition of floating point
instructions.

Signed-off-by: Ken Cox <[e-mail]>
Signed-off-by: Mark Salter <[e-mail]>
CC: Aurelien Jacquiot <[e-mail]>
CC: [e-mail]

arch/c6x/boot/dts/evmc6678.dts

···
+/*
+ * arch/c6x/boot/dts/evmc6678.dts
+ *
+ * EVMC6678 Evaluation Platform For TMS320C6678
+ *
+ * Copyright (C) 2012 Texas Instruments Incorporated
+ *
+ * Author: Ken Cox <[e-mail]>
+ *
+ * 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; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ */
+
+/dts-v1/;
+
+/include/ "tms320c6678.dtsi"
+
+/ {
+	model = "Advantech EVMC6678";
+	compatible = "advantech,evmc6678";
+
+	chosen {
+		bootargs = "root=/dev/nfs ip=dhcp rw";
+	};
+
+	memory {
+		device_type = "memory";
+		reg = <0x80000000 0x20000000>;
+	};
+
+	soc {
+		megamod_pic: interrupt-controller@1800000 {
+		       interrupts = < 12 13 14 15 >;
+		};
+
+		timer8: timer@2280000 {
+			interrupt-parent = <&megamod_pic>;
+			interrupts = < 66 >;
+		};
+
+		timer9: timer@2290000 {
+			interrupt-parent = <&megamod_pic>;
+			interrupts = < 68 >;
+		};
+
+		timer10: timer@22A0000 {
+			interrupt-parent = <&megamod_pic>;
+			interrupts = < 70 >;
+		};
+
+		timer11: timer@22B0000 {
+			interrupt-parent = <&megamod_pic>;
+			interrupts = < 72 >;
+		};
+
+		timer12: timer@22C0000 {
+			interrupt-parent = <&megamod_pic>;
+			interrupts = < 74 >;
+		};
+
+		timer13: timer@22D0000 {
+			interrupt-parent = <&megamod_pic>;
+			interrupts = < 76 >;
+		};
+
+		timer14: timer@22E0000 {
+			interrupt-parent = <&megamod_pic>;
+			interrupts = < 78 >;
+		};
+
+		timer15: timer@22F0000 {
+			interrupt-parent = <&megamod_pic>;
+			interrupts = < 80 >;
+		};
+
+		clock-controller@2310000 {
+			clock-frequency = <100000000>;
+		};
+	};
+};

arch/c6x/boot/dts/tms320c6678.dtsi

···
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu@0 {
+			device_type = "cpu";
+			reg = <0>;
+			model = "ti,c66x";
+		};
+		cpu@1 {
+			device_type = "cpu";
+			reg = <1>;
+			model = "ti,c66x";
+		};
+		cpu@2 {
+			device_type = "cpu";
+			reg = <2>;
+			model = "ti,c66x";
+		};
+		cpu@3 {
+			device_type = "cpu";
+			reg = <3>;
+			model = "ti,c66x";
+		};
+		cpu@4 {
+			device_type = "cpu";
+			reg = <4>;
+			model = "ti,c66x";
+		};
+		cpu@5 {
+			device_type = "cpu";
+			reg = <5>;
+			model = "ti,c66x";
+		};
+		cpu@6 {
+			device_type = "cpu";
+			reg = <6>;
+			model = "ti,c66x";
+		};
+		cpu@7 {
+			device_type = "cpu";
+			reg = <7>;
+			model = "ti,c66x";
+		};
+	};
+
+	soc {
+		compatible = "simple-bus";
+		model = "tms320c6678";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		core_pic: interrupt-controller {
+			compatible = "ti,c64x+core-pic";
+			interrupt-controller;
+			#interrupt-cells = <1>;
+		};
+
+		megamod_pic: interrupt-controller@1800000 {
+		       compatible = "ti,c64x+megamod-pic";
+		       interrupt-controller;
+		       #interrupt-cells = <1>;
+		       reg = <0x1800000 0x1000>;
+		       interrupt-parent = <&core_pic>;
+		};
+
+		cache-controller@1840000 {
+			compatible = "ti,c64x+cache";
+			reg = <0x01840000 0x8400>;
+		};
+
+		timer8: timer@2280000 {
+			compatible = "ti,c64x+timer64";
+			ti,core-mask = < 0x01 >;
+			reg = <0x2280000 0x40>;
+		};
+
+		timer9: timer@2290000 {
+			compatible = "ti,c64x+timer64";
+			ti,core-mask = < 0x02 >;
+			reg = <0x2290000 0x40>;
+		};
+
+		timer10: timer@22A0000 {
+			compatible = "ti,c64x+timer64";
+			ti,core-mask = < 0x04 >;
+			reg = <0x22A0000 0x40>;
+		};
+
+		timer11: timer@22B0000 {
+			compatible = "ti,c64x+timer64";
+			ti,core-mask = < 0x08 >;
+			reg = <0x22B0000 0x40>;
+		};
+
+		timer12: timer@22C0000 {
+			compatible = "ti,c64x+timer64";
+			ti,core-mask = < 0x10 >;
+			reg = <0x22C0000 0x40>;
+		};
+
+		timer13: timer@22D0000 {
+			compatible = "ti,c64x+timer64";
+			ti,core-mask = < 0x20 >;
+			reg = <0x22D0000 0x40>;
+		};
+
+		timer14: timer@22E0000 {
+			compatible = "ti,c64x+timer64";
+			ti,core-mask = < 0x40 >;
+			reg = <0x22E0000 0x40>;
+		};
+
+		timer15: timer@22F0000 {
+			compatible = "ti,c64x+timer64";
+			ti,core-mask = < 0x80 >;
+			reg = <0x22F0000 0x40>;
+		};
+
+		clock-controller@2310000 {
+			compatible = "ti,c6678-pll", "ti,c64x+pll";
+			reg = <0x02310000 0x200>;
+			ti,c64x+pll-bypass-delay = <200>;
+			ti,c64x+pll-reset-delay = <12000>;
+			ti,c64x+pll-lock-delay = <80000>;
+		};
+
+		device-state-controller@2620000 {
+			compatible = "ti,c64x+dscr";
+			reg = <0x02620000 0x1000>;
+
+			ti,dscr-devstat = <0x20>;
+			ti,dscr-silicon-rev = <0x18 28 0xf>;
+
+			ti,dscr-mac-fuse-regs = <0x110 1 2 3 4
+						 0x114 5 6 0 0>;
+
+		};
+	};
+};

arch/c6x/configs/evmc6678_defconfig

···
+CONFIG_SOC_TMS320C6678=y
+CONFIG_EXPERIMENTAL=y
+# CONFIG_LOCALVERSION_AUTO is not set
+CONFIG_SYSVIPC=y
+CONFIG_SPARSE_IRQ=y
+CONFIG_LOG_BUF_SHIFT=14
+CONFIG_NAMESPACES=y
+# CONFIG_UTS_NS is not set
+# CONFIG_USER_NS is not set
+# CONFIG_PID_NS is not set
+CONFIG_BLK_DEV_INITRD=y
+CONFIG_CC_OPTIMIZE_FOR_SIZE=y
+CONFIG_EXPERT=y
+# CONFIG_FUTEX is not set
+# CONFIG_SLUB_DEBUG is not set
+CONFIG_MODULES=y
+CONFIG_MODULE_FORCE_LOAD=y
+CONFIG_MODULE_UNLOAD=y
+CONFIG_MODULE_FORCE_UNLOAD=y
+CONFIG_CMDLINE_BOOL=y
+CONFIG_CMDLINE=""
+# CONFIG_CMDLINE_FORCE is not set
+CONFIG_BOARD_EVM6678=y
+CONFIG_NO_HZ=y
+CONFIG_HIGH_RES_TIMERS=y
+CONFIG_BLK_DEV_LOOP=y
+CONFIG_BLK_DEV_RAM=y
+CONFIG_BLK_DEV_RAM_COUNT=2
+CONFIG_BLK_DEV_RAM_SIZE=17000
+CONFIG_MISC_DEVICES=y
+# CONFIG_INPUT is not set
+# CONFIG_SERIO is not set
+# CONFIG_VT is not set
+# CONFIG_HW_RANDOM is not set
+# CONFIG_HWMON is not set
+# CONFIG_USB_SUPPORT is not set
+# CONFIG_IOMMU_SUPPORT is not set
+# CONFIG_MISC_FILESYSTEMS is not set
+CONFIG_CRC16=y
+# CONFIG_ENABLE_MUST_CHECK is not set
+# CONFIG_SCHED_DEBUG is not set
+# CONFIG_DEBUG_BUGVERBOSE is not set

arch/c6x/kernel/setup.c

···
 		p->cpu_name = "C64x+";
 		p->cpu_voltage = "1.2";
 		break;
+	case 21:
+		p->cpu_name = "C66X";
+		p->cpu_voltage = "1.2";
+		break;
 	default:
 		p->cpu_name = "unknown";
 		break;

arch/c6x/platforms/Kconfig

···
 config SOC_TMS320C6474
 	bool "TMS320C6474"
 	default n
+
+config SOC_TMS320C6678
+	bool "TMS320C6678"
+	default n

arch/c6x/platforms/plldata.c

···
 }
 #endif /* CONFIG_SOC_TMS320C6474 */
 
+#ifdef CONFIG_SOC_TMS320C6678
+static struct clk_lookup c6678_clks[] = {
+	CLK(NULL, "pll1", &c6x_soc_pll1.sysclks[0]),
+	CLK(NULL, "pll1_refclk", &c6x_soc_pll1.sysclks[1]),
+	CLK(NULL, "pll1_sysclk2", &c6x_soc_pll1.sysclks[2]),
+	CLK(NULL, "pll1_sysclk3", &c6x_soc_pll1.sysclks[3]),
+	CLK(NULL, "pll1_sysclk4", &c6x_soc_pll1.sysclks[4]),
+	CLK(NULL, "pll1_sysclk5", &c6x_soc_pll1.sysclks[5]),
+	CLK(NULL, "pll1_sysclk6", &c6x_soc_pll1.sysclks[6]),
+	CLK(NULL, "pll1_sysclk7", &c6x_soc_pll1.sysclks[7]),
+	CLK(NULL, "pll1_sysclk8", &c6x_soc_pll1.sysclks[8]),
+	CLK(NULL, "pll1_sysclk9", &c6x_soc_pll1.sysclks[9]),
+	CLK(NULL, "pll1_sysclk10", &c6x_soc_pll1.sysclks[10]),
+	CLK(NULL, "pll1_sysclk11", &c6x_soc_pll1.sysclks[11]),
+	CLK(NULL, "core", &c6x_core_clk),
+	CLK("", NULL, NULL)
+};
+
+static void __init c6678_setup_clocks(struct device_node *node)
+{
+	struct pll_data *pll = &c6x_soc_pll1;
+	struct clk *sysclks = pll->sysclks;
+
+	pll->flags = PLL_HAS_MUL;
+
+	sysclks[1].flags |= FIXED_DIV_PLL;
+	sysclks[1].div = 1;
+
+	sysclks[2].div = PLLDIV2;
+
+	sysclks[3].flags |= FIXED_DIV_PLL;
+	sysclks[3].div = 2;
+
+	sysclks[4].flags |= FIXED_DIV_PLL;
+	sysclks[4].div = 3;
+
+	sysclks[5].div = PLLDIV5;
+
+	sysclks[6].flags |= FIXED_DIV_PLL;
+	sysclks[6].div = 64;
+
+	sysclks[7].flags |= FIXED_DIV_PLL;
+	sysclks[7].div = 6;
+
+	sysclks[8].div = PLLDIV8;
+
+	sysclks[9].flags |= FIXED_DIV_PLL;
+	sysclks[9].div = 12;
+
+	sysclks[10].flags |= FIXED_DIV_PLL;
+	sysclks[10].div = 3;
+
+	sysclks[11].flags |= FIXED_DIV_PLL;
+	sysclks[11].div = 6;
+
+	c6x_core_clk.parent = &sysclks[0];
+	c6x_i2c_clk.parent = &sysclks[7];
+
+	c6x_clks_init(c6678_clks);
+}
+#endif /* CONFIG_SOC_TMS320C6678 */
+
 static struct of_device_id c6x_clkc_match[] __initdata = {
 #ifdef CONFIG_SOC_TMS320C6455
 	{ .compatible = "ti,c6455-pll", .data = c6455_setup_clocks },
···
 #endif
 #ifdef CONFIG_SOC_TMS320C6474
 	{ .compatible = "ti,c6474-pll", .data = c6474_setup_clocks },
+#endif
+#ifdef CONFIG_SOC_TMS320C6678
+	{ .compatible = "ti,c6678-pll", .data = c6678_setup_clocks },
 #endif
 	{ .compatible = "ti,c64x+pll" },
 	{}