crypto: ccree - add CID and PID support

The new HW uses a new standard product and component ID registers
replacing the old ad-hoc version and signature gister schemes.
Update the driver to support the new HW ID registers.

Signed-off-by: Gilad Ben-Yossef <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

drivers/crypto/ccree/cc_debugfs.c

···
 // SPDX-License-Identifier: GPL-2.0
-/* Copyright (C) 2012-2018 ARM Limited or its affiliates. */
+/* Copyright (C) 2012-2019 ARM Limited or its affiliates. */
 
 #include <linux/kernel.h>
 #include <linux/debugfs.h>
···
  */
 static struct dentry *cc_debugfs_dir;
 
-static struct debugfs_reg32 debug_regs[] = {
+static struct debugfs_reg32 ver_sig_regs[] = {
 	{ .name = "SIGNATURE" }, /* Must be 0th */
 	{ .name = "VERSION" }, /* Must be 1st */
+};
+
+static struct debugfs_reg32 pid_cid_regs[] = {
+	CC_DEBUG_REG(PERIPHERAL_ID_0),
+	CC_DEBUG_REG(PERIPHERAL_ID_1),
+	CC_DEBUG_REG(PERIPHERAL_ID_2),
+	CC_DEBUG_REG(PERIPHERAL_ID_3),
+	CC_DEBUG_REG(PERIPHERAL_ID_4),
+	CC_DEBUG_REG(COMPONENT_ID_0),
+	CC_DEBUG_REG(COMPONENT_ID_1),
+	CC_DEBUG_REG(COMPONENT_ID_2),
+	CC_DEBUG_REG(COMPONENT_ID_3),
+};
+
+static struct debugfs_reg32 debug_regs[] = {
 	CC_DEBUG_REG(HOST_IRR),
 	CC_DEBUG_REG(HOST_POWER_DOWN_EN),
 	CC_DEBUG_REG(AXIM_MON_ERR),
···
 {
 	struct device *dev = drvdata_to_dev(drvdata);
 	struct cc_debugfs_ctx *ctx;
-	struct debugfs_regset32 *regset;
-
-	debug_regs[0].offset = drvdata->sig_offset;
-	debug_regs[1].offset = drvdata->ver_offset;
+	struct debugfs_regset32 *regset, *verset;
 
 	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
 	if (!ctx)
···
 	debugfs_create_regset32("regs", 0400, ctx->dir, regset);
 	debugfs_create_bool("coherent", 0400, ctx->dir, &drvdata->coherent);
 
-	drvdata->debugfs = ctx;
+	verset = devm_kzalloc(dev, sizeof(*verset), GFP_KERNEL);
+	/* Failing here is not important enough to fail the module load */
+	if (!regset)
+		goto out;
 
+	if (drvdata->hw_rev <= CC_HW_REV_712) {
+		ver_sig_regs[0].offset = drvdata->sig_offset;
+		ver_sig_regs[1].offset = drvdata->ver_offset;
+		verset->regs = ver_sig_regs;
+		verset->nregs = ARRAY_SIZE(ver_sig_regs);
+	} else {
+		verset->regs = pid_cid_regs;
+		verset->nregs = ARRAY_SIZE(pid_cid_regs);
+	}
+	verset->base = drvdata->cc_base;
+
+	debugfs_create_regset32("version", 0400, ctx->dir, verset);
+
+out:
+	drvdata->debugfs = ctx;
 	return 0;
 }
 

drivers/crypto/ccree/cc_driver.c

···
 // SPDX-License-Identifier: GPL-2.0
-/* Copyright (C) 2012-2018 ARM Limited or its affiliates. */
+/* Copyright (C) 2012-2019 ARM Limited or its affiliates. */
 
 #include <linux/kernel.h>
 #include <linux/module.h>
···
 bool cc_dump_desc;
 module_param_named(dump_desc, cc_dump_desc, bool, 0600);
 MODULE_PARM_DESC(cc_dump_desc, "Dump descriptors to kernel log as debugging aid");
-
 bool cc_dump_bytes;
 module_param_named(dump_bytes, cc_dump_bytes, bool, 0600);
 MODULE_PARM_DESC(cc_dump_bytes, "Dump buffers to kernel log as debugging aid");
···
 	char *name;
 	enum cc_hw_rev rev;
 	u32 sig;
+	u32 cidr_0123;
+	u32 pidr_0124;
 	int std_bodies;
+};
+
+#define CC_NUM_IDRS 4
+
+/* Note: PIDR3 holds CMOD/Rev so ignored for HW identification purposes */
+static const u32 pidr_0124_offsets[CC_NUM_IDRS] = {
+	CC_REG(PERIPHERAL_ID_0), CC_REG(PERIPHERAL_ID_1),
+	CC_REG(PERIPHERAL_ID_2), CC_REG(PERIPHERAL_ID_4)
+};
+
+static const u32 cidr_0123_offsets[CC_NUM_IDRS] = {
+	CC_REG(COMPONENT_ID_0), CC_REG(COMPONENT_ID_1),
+	CC_REG(COMPONENT_ID_2), CC_REG(COMPONENT_ID_3)
 };
 
 /* Hardware revisions defs. */
 
 /* The 703 is a OSCCA only variant of the 713 */
 static const struct cc_hw_data cc703_hw = {
-	.name = "703", .rev = CC_HW_REV_713, .std_bodies = CC_STD_OSCCA
+	.name = "703", .rev = CC_HW_REV_713, .cidr_0123 = 0xB105F00DU,
+	.pidr_0124 = 0x040BB0D0U, .std_bodies = CC_STD_OSCCA
 };
 
 static const struct cc_hw_data cc713_hw = {
-	.name = "713", .rev = CC_HW_REV_713, .std_bodies = CC_STD_ALL
+	.name = "713", .rev = CC_HW_REV_713, .cidr_0123 = 0xB105F00DU,
+	.pidr_0124 = 0x040BB0D0U, .std_bodies = CC_STD_ALL
 };
 
 static const struct cc_hw_data cc712_hw = {
···
 	{}
 };
 MODULE_DEVICE_TABLE(of, arm_ccree_dev_of_match);
+
+static u32 cc_read_idr(struct cc_drvdata *drvdata, const u32 *idr_offsets)
+{
+	int i;
+	union {
+		u8 regs[CC_NUM_IDRS];
+		u32 val;
+	} idr;
+
+	for (i = 0; i < CC_NUM_IDRS; ++i)
+		idr.regs[i] = cc_ioread(drvdata, idr_offsets[i]);
+
+	return le32_to_cpu(idr.val);
+}
 
 void __dump_byte_array(const char *name, const u8 *buf, size_t len)
 {
···
 	struct cc_drvdata *new_drvdata;
 	struct device *dev = &plat_dev->dev;
 	struct device_node *np = dev->of_node;
-	u32 val;
+	u32 val, hw_rev_pidr, sig_cidr;
 	u64 dma_mask;
 	const struct cc_hw_data *hw_rev;
 	const struct of_device_id *dev_id;
···
 			rc = -EINVAL;
 			goto post_clk_err;
 		}
-		dev_dbg(dev, "CC SIGNATURE=0x%08X\n", val);
+		sig_cidr = val;
+		hw_rev_pidr = cc_ioread(new_drvdata, new_drvdata->ver_offset);
 	} else {
+		/* Verify correct mapping */
+		val = cc_read_idr(new_drvdata, pidr_0124_offsets);
+		if (val != hw_rev->pidr_0124) {
+			dev_err(dev, "Invalid CC PIDR: PIDR0124=0x%08X != expected=0x%08X\n",
+				val,  hw_rev->pidr_0124);
+			rc = -EINVAL;
+			goto post_clk_err;
+		}
+		hw_rev_pidr = val;
+
+		val = cc_read_idr(new_drvdata, cidr_0123_offsets);
+		if (val != hw_rev->cidr_0123) {
+			dev_err(dev, "Invalid CC CIDR: CIDR0123=0x%08X != expected=0x%08X\n",
+			val,  hw_rev->cidr_0123);
+			rc = -EINVAL;
+			goto post_clk_err;
+		}
+		sig_cidr = val;
+
+		/* Check security disable state */
 		val = cc_ioread(new_drvdata, CC_REG(SECURITY_DISABLED));
 		val &= CC_SECURITY_DISABLED_MASK;
 		new_drvdata->sec_disabled |= !!val;
···
 		dev_info(dev, "Security Disabled mode is in effect. Security functions disabled.\n");
 
 	/* Display HW versions */
-	dev_info(dev, "ARM CryptoCell %s Driver: HW version 0x%08X, Driver version %s\n",
-		 hw_rev->name, cc_ioread(new_drvdata, new_drvdata->ver_offset),
-		 DRV_MODULE_VERSION);
+	dev_info(dev, "ARM CryptoCell %s Driver: HW version 0x%08X/0x%8X, Driver version %s\n",
+		 hw_rev->name, hw_rev_pidr, sig_cidr, DRV_MODULE_VERSION);
 
 	rc = init_cc_regs(new_drvdata, true);
 	if (rc) {

drivers/crypto/ccree/cc_host_regs.h

···
 /* SPDX-License-Identifier: GPL-2.0 */
-/* Copyright (C) 2012-2018 ARM Limited or its affiliates. */
+/* Copyright (C) 2012-2019 ARM Limited or its affiliates. */
 
 #ifndef __CC_HOST_H__
 #define __CC_HOST_H__
···
 #define CC_HOST_POWER_DOWN_EN_REG_OFFSET	0xA78UL
 #define CC_HOST_POWER_DOWN_EN_VALUE_BIT_SHIFT	0x0UL
 #define CC_HOST_POWER_DOWN_EN_VALUE_BIT_SIZE	0x1UL
+// --------------------------------------
+// BLOCK: ID_REGISTERS
+// --------------------------------------
+#define CC_PERIPHERAL_ID_4_REG_OFFSET	0x0FD0UL
+#define CC_PERIPHERAL_ID_4_VALUE_BIT_SHIFT	0x0UL
+#define CC_PERIPHERAL_ID_4_VALUE_BIT_SIZE	0x4UL
+#define CC_PIDRESERVED0_REG_OFFSET	0x0FD4UL
+#define CC_PIDRESERVED1_REG_OFFSET	0x0FD8UL
+#define CC_PIDRESERVED2_REG_OFFSET	0x0FDCUL
+#define CC_PERIPHERAL_ID_0_REG_OFFSET	0x0FE0UL
+#define CC_PERIPHERAL_ID_0_VALUE_BIT_SHIFT	0x0UL
+#define CC_PERIPHERAL_ID_0_VALUE_BIT_SIZE	0x8UL
+#define CC_PERIPHERAL_ID_1_REG_OFFSET	0x0FE4UL
+#define CC_PERIPHERAL_ID_1_PART_1_BIT_SHIFT	0x0UL
+#define CC_PERIPHERAL_ID_1_PART_1_BIT_SIZE	0x4UL
+#define CC_PERIPHERAL_ID_1_DES_0_JEP106_BIT_SHIFT	0x4UL
+#define CC_PERIPHERAL_ID_1_DES_0_JEP106_BIT_SIZE	0x4UL
+#define CC_PERIPHERAL_ID_2_REG_OFFSET	0x0FE8UL
+#define CC_PERIPHERAL_ID_2_DES_1_JEP106_BIT_SHIFT	0x0UL
+#define CC_PERIPHERAL_ID_2_DES_1_JEP106_BIT_SIZE	0x3UL
+#define CC_PERIPHERAL_ID_2_JEDEC_BIT_SHIFT	0x3UL
+#define CC_PERIPHERAL_ID_2_JEDEC_BIT_SIZE	0x1UL
+#define CC_PERIPHERAL_ID_2_REVISION_BIT_SHIFT	0x4UL
+#define CC_PERIPHERAL_ID_2_REVISION_BIT_SIZE	0x4UL
+#define CC_PERIPHERAL_ID_3_REG_OFFSET	0x0FECUL
+#define CC_PERIPHERAL_ID_3_CMOD_BIT_SHIFT	0x0UL
+#define CC_PERIPHERAL_ID_3_CMOD_BIT_SIZE	0x4UL
+#define CC_PERIPHERAL_ID_3_REVAND_BIT_SHIFT	0x4UL
+#define CC_PERIPHERAL_ID_3_REVAND_BIT_SIZE	0x4UL
+#define CC_COMPONENT_ID_0_REG_OFFSET	0x0FF0UL
+#define CC_COMPONENT_ID_0_VALUE_BIT_SHIFT	0x0UL
+#define CC_COMPONENT_ID_0_VALUE_BIT_SIZE	0x8UL
+#define CC_COMPONENT_ID_1_REG_OFFSET	0x0FF4UL
+#define CC_COMPONENT_ID_1_PRMBL_1_BIT_SHIFT	0x0UL
+#define CC_COMPONENT_ID_1_PRMBL_1_BIT_SIZE	0x4UL
+#define CC_COMPONENT_ID_1_CLASS_BIT_SHIFT	0x4UL
+#define CC_COMPONENT_ID_1_CLASS_BIT_SIZE	0x4UL
+#define CC_COMPONENT_ID_2_REG_OFFSET	0x0FF8UL
+#define CC_COMPONENT_ID_2_VALUE_BIT_SHIFT	0x0UL
+#define CC_COMPONENT_ID_2_VALUE_BIT_SIZE	0x8UL
+#define CC_COMPONENT_ID_3_REG_OFFSET	0x0FFCUL
+#define CC_COMPONENT_ID_3_VALUE_BIT_SHIFT	0x0UL
+#define CC_COMPONENT_ID_3_VALUE_BIT_SIZE	0x8UL
 // --------------------------------------
 // BLOCK: HOST_SRAM
 // --------------------------------------