tpmdd updates for Linux v5.10

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Merge tag 'tpmdd-next-v5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/jarkko/linux-tpmdd

Pull tpm updates from Jarkko Sakkinen:
 "Support for a new TPM device and fixes and Git URL change (infraded ->
  korg)"

* tag 'tpmdd-next-v5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/jarkko/linux-tpmdd:
  MAINTAINERS: TPM DEVICE DRIVER: Update GIT
  tpm_tis: Add a check for invalid status
  tpm: use %*ph to print small buffer
  dt-bindings: Add SynQucer TPM MMIO as a trivial device
  tpm: tis: add support for MMIO TPM on SynQuacer

Documentation/devicetree/bindings/trivial-devices.yaml

@@ -326,6 +326,8 @@ properties:
           - silabs,si7020
             # Skyworks SKY81452: Six-Channel White LED Driver with Touch Panel Bias Supply
           - skyworks,sky81452
+            # Socionext SynQuacer TPM MMIO module
+          - socionext,synquacer-tpm-mmio
             # i2c serial eeprom  (24cxx)
           - st,24c256
             # Ambient Light Sensor with SMBUS/Two Wire Serial Interface

MAINTAINERS

@@ -17605,7 +17605,7 @@ L:	linux-integrity@vger.kernel.org
 S:	Maintained
 W:	https://kernsec.org/wiki/index.php/Linux_Kernel_Integrity
 Q:	https://patchwork.kernel.org/project/linux-integrity/list/
-T:	git git://git.infradead.org/users/jjs/linux-tpmdd.git
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/jarkko/linux-tpmdd.git
 F:	drivers/char/tpm/
 
 TRACING

drivers/char/tpm/Kconfig

@@ -74,6 +74,18 @@ config TCG_TIS_SPI_CR50
 	  If you have a H1 secure module running Cr50 firmware on SPI bus,
 	  say Yes and it will be accessible from within Linux.
 
+config TCG_TIS_SYNQUACER
+	tristate "TPM Interface Specification 1.2 Interface / TPM 2.0 FIFO Interface (MMIO - SynQuacer)"
+	depends on ARCH_SYNQUACER
+	select TCG_TIS_CORE
+	help
+	  If you have a TPM security chip that is compliant with the
+	  TCG TIS 1.2 TPM specification (TPM1.2) or the TCG PTP FIFO
+	  specification (TPM2.0) say Yes and it will be accessible from
+	  within Linux on Socionext SynQuacer platform.
+	  To compile this driver as a module, choose  M here;
+	  the module will be called tpm_tis_synquacer.
+
 config TCG_TIS_I2C_ATMEL
 	tristate "TPM Interface Specification 1.2 Interface (I2C - Atmel)"
 	depends on I2C

drivers/char/tpm/Makefile

@@ -21,6 +21,7 @@ tpm-$(CONFIG_EFI) += eventlog/efi.o
 tpm-$(CONFIG_OF) += eventlog/of.o
 obj-$(CONFIG_TCG_TIS_CORE) += tpm_tis_core.o
 obj-$(CONFIG_TCG_TIS) += tpm_tis.o
+obj-$(CONFIG_TCG_TIS_SYNQUACER) += tpm_tis_synquacer.o
 
 obj-$(CONFIG_TCG_TIS_SPI) += tpm_tis_spi.o
 tpm_tis_spi-y := tpm_tis_spi_main.o

drivers/char/tpm/tpm-sysfs.c

@@ -56,31 +56,20 @@ static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
 	out = (struct tpm_readpubek_out *)&tpm_buf.data[10];
 	str +=
 	    sprintf(str,
-		    "Algorithm: %02X %02X %02X %02X\n"
-		    "Encscheme: %02X %02X\n"
-		    "Sigscheme: %02X %02X\n"
-		    "Parameters: %02X %02X %02X %02X "
-		    "%02X %02X %02X %02X "
-		    "%02X %02X %02X %02X\n"
+		    "Algorithm: %4ph\n"
+		    "Encscheme: %2ph\n"
+		    "Sigscheme: %2ph\n"
+		    "Parameters: %12ph\n"
 		    "Modulus length: %d\n"
 		    "Modulus:\n",
-		    out->algorithm[0], out->algorithm[1], out->algorithm[2],
-		    out->algorithm[3],
-		    out->encscheme[0], out->encscheme[1],
-		    out->sigscheme[0], out->sigscheme[1],
-		    out->parameters[0], out->parameters[1],
-		    out->parameters[2], out->parameters[3],
-		    out->parameters[4], out->parameters[5],
-		    out->parameters[6], out->parameters[7],
-		    out->parameters[8], out->parameters[9],
-		    out->parameters[10], out->parameters[11],
+		    out->algorithm,
+		    out->encscheme,
+		    out->sigscheme,
+		    out->parameters,
 		    be32_to_cpu(out->keysize));
 
-	for (i = 0; i < 256; i++) {
-		str += sprintf(str, "%02X ", out->modulus[i]);
-		if ((i + 1) % 16 == 0)
-			str += sprintf(str, "\n");
-	}
+	for (i = 0; i < 256; i += 16)
+		str += sprintf(str, "%16ph\n", &out->modulus[i]);
 
 out_buf:
 	tpm_buf_destroy(&tpm_buf);

drivers/char/tpm/tpm_tis_core.c

@@ -239,6 +239,17 @@ static u8 tpm_tis_status(struct tpm_chip *chip)
 	if (rc < 0)
 		return 0;
 
+	if (unlikely((status & TPM_STS_READ_ZERO) != 0)) {
+		/*
+		 * If this trips, the chances are the read is
+		 * returning 0xff because the locality hasn't been
+		 * acquired.  Usually because tpm_try_get_ops() hasn't
+		 * been called before doing a TPM operation.
+		 */
+		WARN_ONCE(1, "TPM returned invalid status\n");
+		return 0;
+	}
+
 	return status;
 }
 

drivers/char/tpm/tpm_tis_core.h

@@ -34,6 +34,7 @@ enum tis_status {
 	TPM_STS_GO = 0x20,
 	TPM_STS_DATA_AVAIL = 0x10,
 	TPM_STS_DATA_EXPECT = 0x08,
+	TPM_STS_READ_ZERO = 0x23, /* bits that must be zero on read */
 };
 
 enum tis_int_flags {

drivers/char/tpm/tpm_tis_synquacer.c

@@ -0,0 +1,208 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 Linaro Ltd.
+ *
+ * This device driver implements MMIO TPM on SynQuacer Platform.
+ */
+#include <linux/acpi.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/kernel.h>
+#include "tpm.h"
+#include "tpm_tis_core.h"
+
+/*
+ * irq > 0 means: use irq $irq;
+ * irq = 0 means: autoprobe for an irq;
+ * irq = -1 means: no irq support
+ */
+struct tpm_tis_synquacer_info {
+	struct resource res;
+	int irq;
+};
+
+struct tpm_tis_synquacer_phy {
+	struct tpm_tis_data priv;
+	void __iomem *iobase;
+};
+
+static inline struct tpm_tis_synquacer_phy *to_tpm_tis_tcg_phy(struct tpm_tis_data *data)
+{
+	return container_of(data, struct tpm_tis_synquacer_phy, priv);
+}
+
+static int tpm_tis_synquacer_read_bytes(struct tpm_tis_data *data, u32 addr,
+					u16 len, u8 *result)
+{
+	struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data);
+
+	while (len--)
+		*result++ = ioread8(phy->iobase + addr);
+
+	return 0;
+}
+
+static int tpm_tis_synquacer_write_bytes(struct tpm_tis_data *data, u32 addr,
+					 u16 len, const u8 *value)
+{
+	struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data);
+
+	while (len--)
+		iowrite8(*value++, phy->iobase + addr);
+
+	return 0;
+}
+
+static int tpm_tis_synquacer_read16_bw(struct tpm_tis_data *data,
+				       u32 addr, u16 *result)
+{
+	struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data);
+
+	/*
+	 * Due to the limitation of SPI controller on SynQuacer,
+	 * 16/32 bits access must be done in byte-wise and descending order.
+	 */
+	*result = (ioread8(phy->iobase + addr + 1) << 8) |
+		  (ioread8(phy->iobase + addr));
+
+	return 0;
+}
+
+static int tpm_tis_synquacer_read32_bw(struct tpm_tis_data *data,
+				       u32 addr, u32 *result)
+{
+	struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data);
+
+	/*
+	 * Due to the limitation of SPI controller on SynQuacer,
+	 * 16/32 bits access must be done in byte-wise and descending order.
+	 */
+	*result = (ioread8(phy->iobase + addr + 3) << 24) |
+		  (ioread8(phy->iobase + addr + 2) << 16) |
+		  (ioread8(phy->iobase + addr + 1) << 8) |
+		  (ioread8(phy->iobase + addr));
+
+	return 0;
+}
+
+static int tpm_tis_synquacer_write32_bw(struct tpm_tis_data *data,
+					u32 addr, u32 value)
+{
+	struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data);
+
+	/*
+	 * Due to the limitation of SPI controller on SynQuacer,
+	 * 16/32 bits access must be done in byte-wise and descending order.
+	 */
+	iowrite8(value >> 24, phy->iobase + addr + 3);
+	iowrite8(value >> 16, phy->iobase + addr + 2);
+	iowrite8(value >> 8, phy->iobase + addr + 1);
+	iowrite8(value, phy->iobase + addr);
+
+	return 0;
+}
+
+static const struct tpm_tis_phy_ops tpm_tcg_bw = {
+	.read_bytes	= tpm_tis_synquacer_read_bytes,
+	.write_bytes	= tpm_tis_synquacer_write_bytes,
+	.read16		= tpm_tis_synquacer_read16_bw,
+	.read32		= tpm_tis_synquacer_read32_bw,
+	.write32	= tpm_tis_synquacer_write32_bw,
+};
+
+static int tpm_tis_synquacer_init(struct device *dev,
+				  struct tpm_tis_synquacer_info *tpm_info)
+{
+	struct tpm_tis_synquacer_phy *phy;
+
+	phy = devm_kzalloc(dev, sizeof(struct tpm_tis_synquacer_phy), GFP_KERNEL);
+	if (phy == NULL)
+		return -ENOMEM;
+
+	phy->iobase = devm_ioremap_resource(dev, &tpm_info->res);
+	if (IS_ERR(phy->iobase))
+		return PTR_ERR(phy->iobase);
+
+	return tpm_tis_core_init(dev, &phy->priv, tpm_info->irq, &tpm_tcg_bw,
+				 ACPI_HANDLE(dev));
+}
+
+static SIMPLE_DEV_PM_OPS(tpm_tis_synquacer_pm, tpm_pm_suspend, tpm_tis_resume);
+
+static int tpm_tis_synquacer_probe(struct platform_device *pdev)
+{
+	struct tpm_tis_synquacer_info tpm_info = {};
+	struct resource *res;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (res == NULL) {
+		dev_err(&pdev->dev, "no memory resource defined\n");
+		return -ENODEV;
+	}
+	tpm_info.res = *res;
+
+	tpm_info.irq = -1;
+
+	return tpm_tis_synquacer_init(&pdev->dev, &tpm_info);
+}
+
+static int tpm_tis_synquacer_remove(struct platform_device *pdev)
+{
+	struct tpm_chip *chip = dev_get_drvdata(&pdev->dev);
+
+	tpm_chip_unregister(chip);
+	tpm_tis_remove(chip);
+
+	return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id tis_synquacer_of_platform_match[] = {
+	{.compatible = "socionext,synquacer-tpm-mmio"},
+	{},
+};
+MODULE_DEVICE_TABLE(of, tis_synquacer_of_platform_match);
+#endif
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id tpm_synquacer_acpi_tbl[] = {
+	{ "SCX0009" },
+	{},
+};
+MODULE_DEVICE_TABLE(acpi, tpm_synquacer_acpi_tbl);
+#endif
+
+static struct platform_driver tis_synquacer_drv = {
+	.probe = tpm_tis_synquacer_probe,
+	.remove = tpm_tis_synquacer_remove,
+	.driver = {
+		.name		= "tpm_tis_synquacer",
+		.pm		= &tpm_tis_synquacer_pm,
+		.of_match_table = of_match_ptr(tis_synquacer_of_platform_match),
+		.acpi_match_table = ACPI_PTR(tpm_synquacer_acpi_tbl),
+	},
+};
+
+static int __init tpm_tis_synquacer_module_init(void)
+{
+	int rc;
+
+	rc = platform_driver_register(&tis_synquacer_drv);
+	if (rc)
+		return rc;
+
+	return 0;
+}
+
+static void __exit tpm_tis_synquacer_module_exit(void)
+{
+	platform_driver_unregister(&tis_synquacer_drv);
+}
+
+module_init(tpm_tis_synquacer_module_init);
+module_exit(tpm_tis_synquacer_module_exit);
+MODULE_DESCRIPTION("TPM MMIO Driver for Socionext SynQuacer platform");
+MODULE_LICENSE("GPL");