1 files changed, 417 insertions, 0 deletions
diff --git a/drivers/crypto/ccree/cc_driver.c b/drivers/crypto/ccree/cc_driver.c
new file mode 100644
index 000000000000..62b902acb5aa
--- /dev/null
+++ b/drivers/crypto/ccree/cc_driver.c
@@ -0,0 +1,417 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2012-2018 ARM Limited or its affiliates. */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include <linux/crypto.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/of.h>
+#include <linux/clk.h>
+#include <linux/of_address.h>
+
+#include "cc_driver.h"
+#include "cc_request_mgr.h"
+#include "cc_buffer_mgr.h"
+#include "cc_debugfs.h"
+#include "cc_ivgen.h"
+#include "cc_sram_mgr.h"
+#include "cc_pm.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");
+
+void __dump_byte_array(const char *name, const u8 *buf, size_t len)
+{
+	char prefix[64];
+
+	if (!buf)
+		return;
+
+	snprintf(prefix, sizeof(prefix), "%s[%zu]: ", name, len);
+
+	print_hex_dump(KERN_DEBUG, prefix, DUMP_PREFIX_ADDRESS, 16, 1, buf,
+		       len, false);
+}
+
+static irqreturn_t cc_isr(int irq, void *dev_id)
+{
+	struct cc_drvdata *drvdata = (struct cc_drvdata *)dev_id;
+	struct device *dev = drvdata_to_dev(drvdata);
+	u32 irr;
+	u32 imr;
+
+	/* STAT_OP_TYPE_GENERIC STAT_PHASE_0: Interrupt */
+
+	/* read the interrupt status */
+	irr = cc_ioread(drvdata, CC_REG(HOST_IRR));
+	dev_dbg(dev, "Got IRR=0x%08X\n", irr);
+	if (irr == 0) { /* Probably shared interrupt line */
+		dev_err(dev, "Got interrupt with empty IRR\n");
+		return IRQ_NONE;
+	}
+	imr = cc_ioread(drvdata, CC_REG(HOST_IMR));
+
+	/* clear interrupt - must be before processing events */
+	cc_iowrite(drvdata, CC_REG(HOST_ICR), irr);
+
+	drvdata->irq = irr;
+	/* Completion interrupt - most probable */
+	if (irr & CC_COMP_IRQ_MASK) {
+		/* Mask AXI completion interrupt - will be unmasked in
+		 * Deferred service handler
+		 */
+		cc_iowrite(drvdata, CC_REG(HOST_IMR), imr | CC_COMP_IRQ_MASK);
+		irr &= ~CC_COMP_IRQ_MASK;
+		complete_request(drvdata);
+	}
+
+	/* AXI error interrupt */
+	if (irr & CC_AXI_ERR_IRQ_MASK) {
+		u32 axi_err;
+
+		/* Read the AXI error ID */
+		axi_err = cc_ioread(drvdata, CC_REG(AXIM_MON_ERR));
+		dev_dbg(dev, "AXI completion error: axim_mon_err=0x%08X\n",
+			axi_err);
+
+		irr &= ~CC_AXI_ERR_IRQ_MASK;
+	}
+
+	if (irr) {
+		dev_dbg(dev, "IRR includes unknown cause bits (0x%08X)\n",
+			irr);
+		/* Just warning */
+	}
+
+	return IRQ_HANDLED;
+}
+
+int init_cc_regs(struct cc_drvdata *drvdata, bool is_probe)
+{
+	unsigned int val, cache_params;
+	struct device *dev = drvdata_to_dev(drvdata);
+
+	/* Unmask all AXI interrupt sources AXI_CFG1 register */
+	val = cc_ioread(drvdata, CC_REG(AXIM_CFG));
+	cc_iowrite(drvdata, CC_REG(AXIM_CFG), val & ~CC_AXI_IRQ_MASK);
+	dev_dbg(dev, "AXIM_CFG=0x%08X\n",
+		cc_ioread(drvdata, CC_REG(AXIM_CFG)));
+
+	/* Clear all pending interrupts */
+	val = cc_ioread(drvdata, CC_REG(HOST_IRR));
+	dev_dbg(dev, "IRR=0x%08X\n", val);
+	cc_iowrite(drvdata, CC_REG(HOST_ICR), val);
+
+	/* Unmask relevant interrupt cause */
+	val = (unsigned int)(~(CC_COMP_IRQ_MASK | CC_AXI_ERR_IRQ_MASK |
+			       CC_GPR0_IRQ_MASK));
+	cc_iowrite(drvdata, CC_REG(HOST_IMR), val);
+
+	cache_params = (drvdata->coherent ? CC_COHERENT_CACHE_PARAMS : 0x0);
+
+	val = cc_ioread(drvdata, CC_REG(AXIM_CACHE_PARAMS));
+
+	if (is_probe)
+		dev_info(dev, "Cache params previous: 0x%08X\n", val);
+
+	cc_iowrite(drvdata, CC_REG(AXIM_CACHE_PARAMS), cache_params);
+	val = cc_ioread(drvdata, CC_REG(AXIM_CACHE_PARAMS));
+
+	if (is_probe)
+		dev_info(dev, "Cache params current: 0x%08X (expect: 0x%08X)\n",
+			 val, cache_params);
+
+	return 0;
+}
+
+static int init_cc_resources(struct platform_device *plat_dev)
+{
+	struct resource *req_mem_cc_regs = NULL;
+	struct cc_drvdata *new_drvdata;
+	struct device *dev = &plat_dev->dev;
+	struct device_node *np = dev->of_node;
+	u32 signature_val;
+	u64 dma_mask;
+	int rc = 0;
+
+	new_drvdata = devm_kzalloc(dev, sizeof(*new_drvdata), GFP_KERNEL);
+	if (!new_drvdata)
+		return -ENOMEM;
+
+	platform_set_drvdata(plat_dev, new_drvdata);
+	new_drvdata->plat_dev = plat_dev;
+
+	new_drvdata->clk = of_clk_get(np, 0);
+	new_drvdata->coherent = of_dma_is_coherent(np);
+
+	/* Get device resources */
+	/* First CC registers space */
+	req_mem_cc_regs = platform_get_resource(plat_dev, IORESOURCE_MEM, 0);
+	/* Map registers space */
+	new_drvdata->cc_base = devm_ioremap_resource(dev, req_mem_cc_regs);
+	if (IS_ERR(new_drvdata->cc_base)) {
+		dev_err(dev, "Failed to ioremap registers");
+		return PTR_ERR(new_drvdata->cc_base);
+	}
+
+	dev_dbg(dev, "Got MEM resource (%s): %pR\n", req_mem_cc_regs->name,
+		req_mem_cc_regs);
+	dev_dbg(dev, "CC registers mapped from %pa to 0x%p\n",
+		&req_mem_cc_regs->start, new_drvdata->cc_base);
+
+	/* Then IRQ */
+	new_drvdata->irq = platform_get_irq(plat_dev, 0);
+	if (new_drvdata->irq < 0) {
+		dev_err(dev, "Failed getting IRQ resource\n");
+		return new_drvdata->irq;
+	}
+
+	rc = devm_request_irq(dev, new_drvdata->irq, cc_isr,
+			      IRQF_SHARED, "ccree", new_drvdata);
+	if (rc) {
+		dev_err(dev, "Could not register to interrupt %d\n",
+			new_drvdata->irq);
+		return rc;
+	}
+	dev_dbg(dev, "Registered to IRQ: %d\n", new_drvdata->irq);
+
+	init_completion(&new_drvdata->hw_queue_avail);
+
+	if (!plat_dev->dev.dma_mask)
+		plat_dev->dev.dma_mask = &plat_dev->dev.coherent_dma_mask;
+
+	dma_mask = DMA_BIT_MASK(DMA_BIT_MASK_LEN);
+	while (dma_mask > 0x7fffffffUL) {
+		if (dma_supported(&plat_dev->dev, dma_mask)) {
+			rc = dma_set_coherent_mask(&plat_dev->dev, dma_mask);
+			if (!rc)
+				break;
+		}
+		dma_mask >>= 1;
+	}
+
+	if (rc) {
+		dev_err(dev, "Failed in dma_set_mask, mask=%pad\n", &dma_mask);
+		return rc;
+	}
+
+	rc = cc_clk_on(new_drvdata);
+	if (rc) {
+		dev_err(dev, "Failed to enable clock");
+		return rc;
+	}
+
+	/* Verify correct mapping */
+	signature_val = cc_ioread(new_drvdata, CC_REG(HOST_SIGNATURE));
+	if (signature_val != CC_DEV_SIGNATURE) {
+		dev_err(dev, "Invalid CC signature: SIGNATURE=0x%08X != expected=0x%08X\n",
+			signature_val, (u32)CC_DEV_SIGNATURE);
+		rc = -EINVAL;
+		goto post_clk_err;
+	}
+	dev_dbg(dev, "CC SIGNATURE=0x%08X\n", signature_val);
+
+	/* Display HW versions */
+	dev_info(dev, "ARM CryptoCell %s Driver: HW version 0x%08X, Driver version %s\n",
+		 CC_DEV_NAME_STR,
+		 cc_ioread(new_drvdata, CC_REG(HOST_VERSION)),
+		 DRV_MODULE_VERSION);
+
+	rc = init_cc_regs(new_drvdata, true);
+	if (rc) {
+		dev_err(dev, "init_cc_regs failed\n");
+		goto post_clk_err;
+	}
+
+	rc = cc_debugfs_init(new_drvdata);
+	if (rc) {
+		dev_err(dev, "Failed registering debugfs interface\n");
+		goto post_regs_err;
+	}
+
+	rc = cc_sram_mgr_init(new_drvdata);
+	if (rc) {
+		dev_err(dev, "cc_sram_mgr_init failed\n");
+		goto post_debugfs_err;
+	}
+
+	new_drvdata->mlli_sram_addr =
+		cc_sram_alloc(new_drvdata, MAX_MLLI_BUFF_SIZE);
+	if (new_drvdata->mlli_sram_addr == NULL_SRAM_ADDR) {
+		dev_err(dev, "Failed to alloc MLLI Sram buffer\n");
+		rc = -ENOMEM;
+		goto post_sram_mgr_err;
+	}
+
+	rc = cc_req_mgr_init(new_drvdata);
+	if (rc) {
+		dev_err(dev, "cc_req_mgr_init failed\n");
+		goto post_sram_mgr_err;
+	}
+
+	rc = cc_buffer_mgr_init(new_drvdata);
+	if (rc) {
+		dev_err(dev, "buffer_mgr_init failed\n");
+		goto post_req_mgr_err;
+	}
+
+	rc = cc_pm_init(new_drvdata);
+	if (rc) {
+		dev_err(dev, "ssi_power_mgr_init failed\n");
+		goto post_buf_mgr_err;
+	}
+
+	rc = cc_ivgen_init(new_drvdata);
+	if (rc) {
+		dev_err(dev, "cc_ivgen_init failed\n");
+		goto post_power_mgr_err;
+	}
+
+	return 0;
+
+post_power_mgr_err:
+	cc_pm_fini(new_drvdata);
+post_buf_mgr_err:
+	 cc_buffer_mgr_fini(new_drvdata);
+post_req_mgr_err:
+	cc_req_mgr_fini(new_drvdata);
+post_sram_mgr_err:
+	cc_sram_mgr_fini(new_drvdata);
+post_debugfs_err:
+	cc_debugfs_fini(new_drvdata);
+post_regs_err:
+	fini_cc_regs(new_drvdata);
+post_clk_err:
+	cc_clk_off(new_drvdata);
+	return rc;
+}
+
+void fini_cc_regs(struct cc_drvdata *drvdata)
+{
+	/* Mask all interrupts */
+	cc_iowrite(drvdata, CC_REG(HOST_IMR), 0xFFFFFFFF);
+}
+
+static void cleanup_cc_resources(struct platform_device *plat_dev)
+{
+	struct cc_drvdata *drvdata =
+		(struct cc_drvdata *)platform_get_drvdata(plat_dev);
+
+	cc_ivgen_fini(drvdata);
+	cc_pm_fini(drvdata);
+	cc_buffer_mgr_fini(drvdata);
+	cc_req_mgr_fini(drvdata);
+	cc_sram_mgr_fini(drvdata);
+	cc_debugfs_fini(drvdata);
+	fini_cc_regs(drvdata);
+	cc_clk_off(drvdata);
+}
+
+int cc_clk_on(struct cc_drvdata *drvdata)
+{
+	struct clk *clk = drvdata->clk;
+	int rc;
+
+	if (IS_ERR(clk))
+		/* Not all devices have a clock associated with CCREE  */
+		return 0;
+
+	rc = clk_prepare_enable(clk);
+	if (rc)
+		return rc;
+
+	return 0;
+}
+
+void cc_clk_off(struct cc_drvdata *drvdata)
+{
+	struct clk *clk = drvdata->clk;
+
+	if (IS_ERR(clk))
+		/* Not all devices have a clock associated with CCREE */
+		return;
+
+	clk_disable_unprepare(clk);
+}
+
+static int ccree_probe(struct platform_device *plat_dev)
+{
+	int rc;
+	struct device *dev = &plat_dev->dev;
+
+	/* Map registers space */
+	rc = init_cc_resources(plat_dev);
+	if (rc)
+		return rc;
+
+	dev_info(dev, "ARM ccree device initialized\n");
+
+	return 0;
+}
+
+static int ccree_remove(struct platform_device *plat_dev)
+{
+	struct device *dev = &plat_dev->dev;
+
+	dev_dbg(dev, "Releasing ccree resources...\n");
+
+	cleanup_cc_resources(plat_dev);
+
+	dev_info(dev, "ARM ccree device terminated\n");
+
+	return 0;
+}
+
+static const struct of_device_id arm_ccree_dev_of_match[] = {
+	{.compatible = "arm,cryptocell-712-ree"},
+	{}
+};
+MODULE_DEVICE_TABLE(of, arm_ccree_dev_of_match);
+
+static struct platform_driver ccree_driver = {
+	.driver = {
+		   .name = "ccree",
+		   .of_match_table = arm_ccree_dev_of_match,
+#ifdef CONFIG_PM
+		   .pm = &ccree_pm,
+#endif
+	},
+	.probe = ccree_probe,
+	.remove = ccree_remove,
+};
+
+static int __init ccree_init(void)
+{
+	int ret;
+
+	ret = cc_debugfs_global_init();
+	if (ret)
+		return ret;
+
+	return platform_driver_register(&ccree_driver);
+}
+module_init(ccree_init);
+
+static void __exit ccree_exit(void)
+{
+	platform_driver_unregister(&ccree_driver);
+	cc_debugfs_global_fini();
+}
+module_exit(ccree_exit);
+
+/* Module description */
+MODULE_DESCRIPTION("ARM TrustZone CryptoCell REE Driver");
+MODULE_VERSION(DRV_MODULE_VERSION);
+MODULE_AUTHOR("ARM");
+MODULE_LICENSE("GPL v2");