cpu: Add MPC83xx CPU driver

Add a CPU driver for the MPC83xx architecture.

Signed-off-by: Mario Six <mario.six@gdsys.cc>

Documentation/devicetree/bindings/cpu/fsl,mpc83xx.txt

@@ -0,0 +1,34 @@
+MPC83xx CPU devices
+
+MPC83xx SoCs contain a e300 core as their main processor.
+
+Required properties:
+- compatible: must be one of "fsl,mpc83xx",
+                             "fsl,mpc8308",
+                             "fsl,mpc8309",
+                             "fsl,mpc8313",
+                             "fsl,mpc8315",
+                             "fsl,mpc832x",
+                             "fsl,mpc8349",
+                             "fsl,mpc8360",
+                             "fsl,mpc8379"
+- clocks: has to have two entries, which must be the core clock at index 0 and
+  the CSB (Coherent System Bus) clock at index 1. Both are given by a suitable
+  "fsl,mpc83xx-clk" device
+
+Example:
+
+socclocks: clocks {
+	compatible = "fsl,mpc8315-clk";
+	#clock-cells = <1>;
+};
+
+cpus {
+	compatible = "cpu_bus";
+
+	PowerPC,8315@0 {
+		compatible = "fsl,mpc8315";
+		clocks = <&socclocks MPC83XX_CLK_CORE
+		          &socclocks MPC83XX_CLK_CSB>;
+	};
+};

MAINTAINERS

@@ -527,6 +527,8 @@ F:	drivers/clk/mpc83xx_clk.c
 F:	drivers/clk/mpc83xx_clk.h
 F:	include/dt-bindings/clk/mpc83xx-clk.h
 F:	drivers/timer/mpc83xx_timer.c
+F:	drivers/cpu/mpc83xx_cpu.c
+F:	drivers/cpu/mpc83xx_cpu.h
 F:	arch/powerpc/cpu/mpc83xx/
 F:	arch/powerpc/include/asm/arch-mpc83xx/
 

arch/powerpc/cpu/mpc83xx/cpu.c

@@ -25,6 +25,7 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+#ifndef CONFIG_CPU_MPC83XX
 int checkcpu(void)
 {
 	volatile immap_t *immr;
@@ -114,6 +115,7 @@ int checkcpu(void)
 
 	return 0;
 }
+#endif
 
 #ifndef CONFIG_SYSRESET
 int

arch/powerpc/cpu/mpc83xx/cpu_init.c

@@ -464,6 +464,7 @@ static int print_83xx_arb_event(int force)
 }
 #endif /* CONFIG_DISPLAY_AER_xxxx */
 
+#ifndef CONFIG_CPU_MPC83XX
 /*
  * Figure out the cause of the reset
  */
@@ -505,3 +506,4 @@ int prt_83xx_rsr(void)
 
 	return 0;
 }
+#endif

arch/powerpc/include/asm/processor.h

@@ -1325,7 +1325,9 @@ void ll_puts(const char *);
 /* In misc.c */
 void _nmask_and_or_msr(unsigned long nmask, unsigned long or_val);
 
+#ifndef CONFIG_CPU_MPC83XX
 int prt_83xx_rsr(void);
+#endif
 
 #endif /* ndef ASSEMBLY*/
 

drivers/cpu/Kconfig

@@ -6,3 +6,10 @@ config CPU
 	  multiple CPUs, then normally have to be set up in U-Boot so that
 	  they can work correctly in the OS. This provides a framework for
 	  finding out information about available CPUs and making changes.
+
+config CPU_MPC83XX
+	bool "Enable MPC83xx CPU driver"
+	depends on CPU
+	select CLK_MPC83XX
+	help
+	  Support CPU cores for SoCs of the MPC83xx series.

drivers/cpu/Makefile

@@ -7,4 +7,5 @@
 obj-$(CONFIG_CPU) += cpu-uclass.o
 
 obj-$(CONFIG_ARCH_BMIPS) += bmips_cpu.o
+obj-$(CONFIG_CPU_MPC83XX) += mpc83xx_cpu.o
 obj-$(CONFIG_SANDBOX) += cpu_sandbox.o

drivers/cpu/mpc83xx_cpu.c

@@ -0,0 +1,349 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2018
+ * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
+ */
+
+#include <common.h>
+#include <bitfield.h>
+#include <clk.h>
+#include <cpu.h>
+#include <dm.h>
+
+#include "mpc83xx_cpu.h"
+
+/**
+ * struct mpc83xx_cpu_priv - Private data for MPC83xx CPUs
+ * @e300_type:      The e300 core type of the MPC83xx CPU
+ * @family:         The MPC83xx family the CPU belongs to
+ * @type:           The MPC83xx type of the CPU
+ * @is_e_processor: Flag indicating whether the CPU is a E processor or not
+ * @is_a_variant:   Flag indicating whtther the CPU is a A variant or not
+ * @revid:          The revision ID of the CPU
+ * @revid.major:    The major part of the CPU's revision ID
+ * @revid.minor:    The minor part of the CPU's revision ID
+ */
+struct mpc83xx_cpu_priv {
+	enum e300_type e300_type;
+	enum mpc83xx_cpu_family family;
+	enum mpc83xx_cpu_type type;
+	bool is_e_processor;
+	bool is_a_variant;
+	struct {
+		uint major;
+		uint minor;
+	} revid;
+};
+
+int checkcpu(void)
+{
+	/* Activate all CPUs  from board_f.c */
+	return cpu_probe_all();
+}
+
+/**
+ * get_spridr() - Read SPRIDR (System Part and Revision ID Register) of CPU
+ *
+ * Return: The SPRIDR value
+ */
+static inline u32 get_spridr(void)
+{
+	immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
+
+	return in_be32(&immr->sysconf.spridr);
+}
+
+/**
+ * determine_type() - Determine CPU family of MPC83xx device
+ * @dev: CPU device from which to read CPU family from
+ */
+static inline void determine_family(struct udevice *dev)
+{
+	struct mpc83xx_cpu_priv *priv = dev_get_priv(dev);
+	/* Upper 12 bits of PARTID field (bits 0-23 in SPRIDR) */
+	const u32 PARTID_FAMILY_MASK = 0xFFF00000;
+
+	switch (bitfield_extract_by_mask(get_spridr(), PARTID_FAMILY_MASK)) {
+	case 0x810:
+	case 0x811:
+		priv->family = FAMILY_830X;
+		break;
+	case 0x80B:
+		priv->family = FAMILY_831X;
+		break;
+	case 0x806:
+		priv->family = FAMILY_832X;
+		break;
+	case 0x803:
+		priv->family = FAMILY_834X;
+		break;
+	case 0x804:
+		priv->family = FAMILY_836X;
+		break;
+	case 0x80C:
+		priv->family = FAMILY_837X;
+		break;
+	default:
+		priv->family = FAMILY_UNKNOWN;
+	}
+}
+
+/**
+ * determine_type() - Determine CPU type of MPC83xx device
+ * @dev: CPU device from which to read CPU type from
+ */
+static inline void determine_type(struct udevice *dev)
+{
+	struct mpc83xx_cpu_priv *priv = dev_get_priv(dev);
+	/* Upper 16 bits of PVR (Processor Version Register) */
+	const u32 PCR_UPPER_MASK = 0xFFFF0000;
+	u32 val;
+
+	val = bitfield_extract_by_mask(get_spridr(), PCR_UPPER_MASK);
+
+	/* Mask out E-variant bit */
+	switch (val & 0xFFFE) {
+	case 0x8100:
+		priv->type = TYPE_8308;
+		break;
+	case 0x8110:
+		priv->type = TYPE_8309;
+		break;
+	case 0x80B2:
+		priv->type = TYPE_8311;
+		break;
+	case 0x80B0:
+		priv->type = TYPE_8313;
+		break;
+	case 0x80B6:
+		priv->type = TYPE_8314;
+		break;
+	case 0x80B4:
+		priv->type = TYPE_8315;
+		break;
+	case 0x8066:
+		priv->type = TYPE_8321;
+		break;
+	case 0x8062:
+		priv->type = TYPE_8323;
+		break;
+	case 0x8036:
+		priv->type = TYPE_8343;
+		break;
+	case 0x8032:
+		priv->type = TYPE_8347_TBGA;
+		break;
+	case 0x8034:
+		priv->type = TYPE_8347_PBGA;
+		break;
+	case 0x8030:
+		priv->type = TYPE_8349;
+		break;
+	case 0x804A:
+		priv->type = TYPE_8358_TBGA;
+		break;
+	case 0x804E:
+		priv->type = TYPE_8358_PBGA;
+		break;
+	case 0x8048:
+		priv->type = TYPE_8360;
+		break;
+	case 0x80C6:
+		priv->type = TYPE_8377;
+		break;
+	case 0x80C4:
+		priv->type = TYPE_8378;
+		break;
+	case 0x80C2:
+		priv->type = TYPE_8379;
+		break;
+	default:
+		priv->type = TYPE_UNKNOWN;
+	}
+}
+
+/**
+ * determine_e300_type() - Determine e300 core type of MPC83xx device
+ * @dev: CPU device from which to read e300 core type from
+ */
+static inline void determine_e300_type(struct udevice *dev)
+{
+	struct mpc83xx_cpu_priv *priv = dev_get_priv(dev);
+	/* Upper 16 bits of PVR (Processor Version Register) */
+	const u32 PCR_UPPER_MASK = 0xFFFF0000;
+	u32 pvr = get_pvr();
+
+	switch ((pvr & PCR_UPPER_MASK) >> 16) {
+	case 0x8083:
+		priv->e300_type = E300C1;
+		break;
+	case 0x8084:
+		priv->e300_type = E300C2;
+		break;
+	case 0x8085:
+		priv->e300_type = E300C3;
+		break;
+	case 0x8086:
+		priv->e300_type = E300C4;
+		break;
+	default:
+		priv->e300_type = E300_UNKNOWN;
+	}
+}
+
+/**
+ * determine_revid() - Determine revision ID of CPU device
+ * @dev: CPU device from which to read revision ID
+ */
+static inline void determine_revid(struct udevice *dev)
+{
+	struct mpc83xx_cpu_priv *priv = dev_get_priv(dev);
+	u32 REVID_MAJOR_MASK;
+	u32 REVID_MINOR_MASK;
+	u32 spridr = get_spridr();
+
+	if (priv->family == FAMILY_834X) {
+		REVID_MAJOR_MASK = 0x0000FF00;
+		REVID_MINOR_MASK = 0x000000FF;
+	} else {
+		REVID_MAJOR_MASK = 0x000000F0;
+		REVID_MINOR_MASK = 0x0000000F;
+	}
+
+	priv->revid.major = bitfield_extract_by_mask(spridr, REVID_MAJOR_MASK);
+	priv->revid.minor = bitfield_extract_by_mask(spridr, REVID_MINOR_MASK);
+}
+
+/**
+ * determine_cpu_data() - Determine CPU information from hardware
+ * @dev: CPU device from which to read information
+ */
+static void determine_cpu_data(struct udevice *dev)
+{
+	struct mpc83xx_cpu_priv *priv = dev_get_priv(dev);
+	const u32 E_FLAG_MASK = 0x00010000;
+	u32 spridr = get_spridr();
+
+	determine_family(dev);
+	determine_type(dev);
+	determine_e300_type(dev);
+	determine_revid(dev);
+
+	if ((priv->family == FAMILY_834X ||
+	     priv->family == FAMILY_836X) && priv->revid.major >= 2)
+		priv->is_a_variant = true;
+
+	priv->is_e_processor = !bitfield_extract_by_mask(spridr, E_FLAG_MASK);
+}
+
+static int mpc83xx_cpu_get_desc(struct udevice *dev, char *buf, int size)
+{
+	struct mpc83xx_cpu_priv *priv = dev_get_priv(dev);
+	struct clk core_clk;
+	struct clk csb_clk;
+	char core_freq[32];
+	char csb_freq[32];
+	int ret;
+
+	ret = clk_get_by_index(dev, 0, &core_clk);
+	if (ret) {
+		debug("%s: Failed to get core clock (err = %d)\n",
+		      dev->name, ret);
+		return ret;
+	}
+
+	ret = clk_get_by_index(dev, 1, &csb_clk);
+	if (ret) {
+		debug("%s: Failed to get CSB clock (err = %d)\n",
+		      dev->name, ret);
+		return ret;
+	}
+
+	determine_cpu_data(dev);
+
+	snprintf(buf, size,
+		 "CPU:   %s, MPC%s%s%s, Rev: %d.%d at %s MHz, CSB: %s MHz\n",
+		 e300_names[priv->e300_type],
+		 cpu_type_names[priv->type],
+		 priv->is_e_processor ? "E" : "",
+		 priv->is_a_variant ? "A" : "",
+		 priv->revid.major,
+		 priv->revid.minor,
+		 strmhz(core_freq, clk_get_rate(&core_clk)),
+		 strmhz(csb_freq, clk_get_rate(&csb_clk)));
+
+	return 0;
+}
+
+static int mpc83xx_cpu_get_info(struct udevice *dev, struct cpu_info *info)
+{
+	struct clk clock;
+	int ret;
+	ulong freq;
+
+	ret = clk_get_by_index(dev, 0, &clock);
+	if (ret) {
+		debug("%s: Failed to get core clock (err = %d)\n",
+		      dev->name, ret);
+		return ret;
+	}
+
+	freq = clk_get_rate(&clock);
+	if (!freq) {
+		debug("%s: Core clock speed is zero\n", dev->name);
+		return -EINVAL;
+	}
+
+	info->cpu_freq = freq;
+	info->features = BIT(CPU_FEAT_L1_CACHE) | BIT(CPU_FEAT_MMU);
+
+	return 0;
+}
+
+static int mpc83xx_cpu_get_count(struct udevice *dev)
+{
+	/* We have one e300cX core */
+	return 1;
+}
+
+static int mpc83xx_cpu_get_vendor(struct udevice *dev, char *buf, int size)
+{
+	snprintf(buf, size, "NXP");
+
+	return 0;
+}
+
+static const struct cpu_ops mpc83xx_cpu_ops = {
+	.get_desc = mpc83xx_cpu_get_desc,
+	.get_info = mpc83xx_cpu_get_info,
+	.get_count = mpc83xx_cpu_get_count,
+	.get_vendor = mpc83xx_cpu_get_vendor,
+};
+
+static int mpc83xx_cpu_probe(struct udevice *dev)
+{
+	return 0;
+}
+
+static const struct udevice_id mpc83xx_cpu_ids[] = {
+	{ .compatible = "fsl,mpc83xx", },
+	{ .compatible = "fsl,mpc8308", },
+	{ .compatible = "fsl,mpc8309", },
+	{ .compatible = "fsl,mpc8313", },
+	{ .compatible = "fsl,mpc8315", },
+	{ .compatible = "fsl,mpc832x", },
+	{ .compatible = "fsl,mpc8349", },
+	{ .compatible = "fsl,mpc8360", },
+	{ .compatible = "fsl,mpc8379", },
+	{ /* sentinel */ }
+};
+
+U_BOOT_DRIVER(mpc83xx_cpu) = {
+	.name = "mpc83xx_cpu",
+	.id = UCLASS_CPU,
+	.of_match = mpc83xx_cpu_ids,
+	.probe = mpc83xx_cpu_probe,
+	.priv_auto_alloc_size = sizeof(struct mpc83xx_cpu_priv),
+	.ops = &mpc83xx_cpu_ops,
+	.flags = DM_FLAG_PRE_RELOC,
+};

drivers/cpu/mpc83xx_cpu.h

@@ -0,0 +1,126 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * (C) Copyright 2018
+ * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
+ */
+
+#ifndef _MPC83XX_CPU_H_
+#define _MPC83XX_CPU_H_
+
+/**
+ * enum e300_type - Identifiers for e300 cores
+ * @E300C1:       Identifier for e300c1 cores
+ * @E300C2:       Identifier for e300c2 cores
+ * @E300C3:       Identifier for e300c3 cores
+ * @E300C4:       Identifier for e300c4 cores
+ * @E300_UNKNOWN: Identifier for unknown e300 cores
+ */
+enum e300_type {
+	E300C1,
+	E300C2,
+	E300C3,
+	E300C4,
+	E300_UNKNOWN,
+};
+
+/* Array mapping the e300 core types to their human-readable names */
+static const char * const e300_names[] = {
+	[E300C1] = "e300c1",
+	[E300C2] = "e300c2",
+	[E300C3] = "e300c3",
+	[E300C4] = "e300c4",
+	[E300_UNKNOWN] = "Unknown e300",
+};
+
+/**
+ * enum mpc83xx_cpu_family - Identifiers for MPC83xx CPU families
+ * @FAMILY_830X:    Identifier for the MPC830x CPU family
+ * @FAMILY_831X:    Identifier for the MPC831x CPU family
+ * @FAMILY_832X:    Identifier for the MPC832x CPU family
+ * @FAMILY_834X:    Identifier for the MPC834x CPU family
+ * @FAMILY_836X:    Identifier for the MPC836x CPU family
+ * @FAMILY_837X:    Identifier for the MPC837x CPU family
+ * @FAMILY_UNKNOWN: Identifier for an unknown MPC83xx CPU family
+ */
+enum mpc83xx_cpu_family {
+	FAMILY_830X,
+	FAMILY_831X,
+	FAMILY_832X,
+	FAMILY_834X,
+	FAMILY_836X,
+	FAMILY_837X,
+	FAMILY_UNKNOWN,
+};
+
+/**
+ * enum mpc83xx_cpu_type - Identifiers for MPC83xx CPU types
+ * @TYPE_8308:      Identifier for the MPC8308 CPU type
+ * @TYPE_8309:      Identifier for the MPC8309 CPU type
+ * @TYPE_8311:      Identifier for the MPC8311 CPU type
+ * @TYPE_8313:      Identifier for the MPC8313 CPU type
+ * @TYPE_8314:      Identifier for the MPC8314 CPU type
+ * @TYPE_8315:      Identifier for the MPC8315 CPU type
+ * @TYPE_8321:      Identifier for the MPC8321 CPU type
+ * @TYPE_8323:      Identifier for the MPC8323 CPU type
+ * @TYPE_8343:      Identifier for the MPC8343 CPU type
+ * @TYPE_8347_TBGA: Identifier for the MPC8347 CPU type (Tape Ball Grid Array
+ *		    version)
+ * @TYPE_8347_PBGA: Identifier for the MPC8347 CPU type (Plastic Ball Grid Array
+ *		    version)
+ * @TYPE_8349:      Identifier for the MPC8349 CPU type
+ * @TYPE_8358_TBGA: Identifier for the MPC8358 CPU type (Tape Ball Grid Array
+ *		    version)
+ * @TYPE_8358_PBGA: Identifier for the MPC8358 CPU type (Plastic Ball Grid Array
+ *		    version)
+ * @TYPE_8360:      Identifier for the MPC8360 CPU type
+ * @TYPE_8377:      Identifier for the MPC8377 CPU type
+ * @TYPE_8378:      Identifier for the MPC8378 CPU type
+ * @TYPE_8379:      Identifier for the MPC8379 CPU type
+ * @TYPE_UNKNOWN:   Identifier for an unknown MPC83xx CPU type
+ */
+enum mpc83xx_cpu_type {
+	TYPE_8308,
+	TYPE_8309,
+	TYPE_8311,
+	TYPE_8313,
+	TYPE_8314,
+	TYPE_8315,
+	TYPE_8321,
+	TYPE_8323,
+	TYPE_8343,
+	TYPE_8347_TBGA,
+	TYPE_8347_PBGA,
+	TYPE_8349,
+	TYPE_8358_TBGA,
+	TYPE_8358_PBGA,
+	TYPE_8360,
+	TYPE_8377,
+	TYPE_8378,
+	TYPE_8379,
+	TYPE_UNKNOWN,
+};
+
+/* Array mapping the MCP83xx CPUs to their human-readable names */
+static const char * const cpu_type_names[] = {
+	[TYPE_8308] = "8308",
+	[TYPE_8309] = "8309",
+	[TYPE_8311] = "8311",
+	[TYPE_8313] = "8313",
+	[TYPE_8314] = "8314",
+	[TYPE_8315] = "8315",
+	[TYPE_8321] = "8321",
+	[TYPE_8323] = "8323",
+	[TYPE_8343] = "8343",
+	[TYPE_8347_TBGA] = "8347_TBGA",
+	[TYPE_8347_PBGA] = "8347_PBGA",
+	[TYPE_8349] = "8349",
+	[TYPE_8358_TBGA] = "8358_TBGA",
+	[TYPE_8358_PBGA] = "8358_PBGA",
+	[TYPE_8360] = "8360",
+	[TYPE_8377] = "8377",
+	[TYPE_8378] = "8378",
+	[TYPE_8379] = "8379",
+	[TYPE_UNKNOWN] = "Unknown CPU",
+};
+
+#endif /* !_MPC83XX_CPU_H_ */