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path: root/drivers/char/tpm/tpm_tis_synquacer.c
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Diffstat (limited to 'drivers/char/tpm/tpm_tis_synquacer.c')
-rw-r--r--drivers/char/tpm/tpm_tis_synquacer.c186
1 files changed, 186 insertions, 0 deletions
diff --git a/drivers/char/tpm/tpm_tis_synquacer.c b/drivers/char/tpm/tpm_tis_synquacer.c
new file mode 100644
index 000000000..679196c61
--- /dev/null
+++ b/drivers/char/tpm/tpm_tis_synquacer.c
@@ -0,0 +1,186 @@
+// 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,
+ enum tpm_tis_io_mode io_mode)
+{
+ struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data);
+ switch (io_mode) {
+ case TPM_TIS_PHYS_8:
+ while (len--)
+ *result++ = ioread8(phy->iobase + addr);
+ break;
+ case TPM_TIS_PHYS_16:
+ result[1] = ioread8(phy->iobase + addr + 1);
+ result[0] = ioread8(phy->iobase + addr);
+ break;
+ case TPM_TIS_PHYS_32:
+ result[3] = ioread8(phy->iobase + addr + 3);
+ result[2] = ioread8(phy->iobase + addr + 2);
+ result[1] = ioread8(phy->iobase + addr + 1);
+ result[0] = ioread8(phy->iobase + addr);
+ break;
+ }
+
+ return 0;
+}
+
+static int tpm_tis_synquacer_write_bytes(struct tpm_tis_data *data, u32 addr,
+ u16 len, const u8 *value,
+ enum tpm_tis_io_mode io_mode)
+{
+ struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data);
+ switch (io_mode) {
+ case TPM_TIS_PHYS_8:
+ while (len--)
+ iowrite8(*value++, phy->iobase + addr);
+ break;
+ case TPM_TIS_PHYS_16:
+ return -EINVAL;
+ case TPM_TIS_PHYS_32:
+ /*
+ * Due to the limitation of SPI controller on SynQuacer,
+ * 16/32 bits access must be done in byte-wise and descending order.
+ */
+ iowrite8(value[3], phy->iobase + addr + 3);
+ iowrite8(value[2], phy->iobase + addr + 2);
+ iowrite8(value[1], phy->iobase + addr + 1);
+ iowrite8(value[0], phy->iobase + addr);
+ break;
+ }
+
+ 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,
+};
+
+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");