diff options
Diffstat (limited to 'drivers/crypto/ccp/sp-platform.c')
| -rw-r--r-- | drivers/crypto/ccp/sp-platform.c | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/drivers/crypto/ccp/sp-platform.c b/drivers/crypto/ccp/sp-platform.c new file mode 100644 index 000000000000..71734f254fd1 --- /dev/null +++ b/drivers/crypto/ccp/sp-platform.c @@ -0,0 +1,256 @@ +/* + * AMD Secure Processor device driver + * + * Copyright (C) 2014,2016 Advanced Micro Devices, Inc. + * + * Author: Tom Lendacky <thomas.lendacky@amd.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/device.h> +#include <linux/platform_device.h> +#include <linux/ioport.h> +#include <linux/dma-mapping.h> +#include <linux/kthread.h> +#include <linux/sched.h> +#include <linux/interrupt.h> +#include <linux/spinlock.h> +#include <linux/delay.h> +#include <linux/ccp.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/acpi.h> + +#include "ccp-dev.h" + +struct sp_platform { + int coherent; + unsigned int irq_count; +}; + +static const struct acpi_device_id sp_acpi_match[]; +static const struct of_device_id sp_of_match[]; + +static struct sp_dev_vdata *sp_get_of_version(struct platform_device *pdev) +{ +#ifdef CONFIG_OF + const struct of_device_id *match; + + match = of_match_node(sp_of_match, pdev->dev.of_node); + if (match && match->data) + return (struct sp_dev_vdata *)match->data; +#endif + return NULL; +} + +static struct sp_dev_vdata *sp_get_acpi_version(struct platform_device *pdev) +{ +#ifdef CONFIG_ACPI + const struct acpi_device_id *match; + + match = acpi_match_device(sp_acpi_match, &pdev->dev); + if (match && match->driver_data) + return (struct sp_dev_vdata *)match->driver_data; +#endif + return NULL; +} + +static int sp_get_irqs(struct sp_device *sp) +{ + struct sp_platform *sp_platform = sp->dev_specific; + struct device *dev = sp->dev; + struct platform_device *pdev = to_platform_device(dev); + unsigned int i, count; + int ret; + + for (i = 0, count = 0; i < pdev->num_resources; i++) { + struct resource *res = &pdev->resource[i]; + + if (resource_type(res) == IORESOURCE_IRQ) + count++; + } + + sp_platform->irq_count = count; + + ret = platform_get_irq(pdev, 0); + if (ret < 0) { + dev_notice(dev, "unable to get IRQ (%d)\n", ret); + return ret; + } + + sp->psp_irq = ret; + if (count == 1) { + sp->ccp_irq = ret; + } else { + ret = platform_get_irq(pdev, 1); + if (ret < 0) { + dev_notice(dev, "unable to get IRQ (%d)\n", ret); + return ret; + } + + sp->ccp_irq = ret; + } + + return 0; +} + +static int sp_platform_probe(struct platform_device *pdev) +{ + struct sp_device *sp; + struct sp_platform *sp_platform; + struct device *dev = &pdev->dev; + enum dev_dma_attr attr; + struct resource *ior; + int ret; + + ret = -ENOMEM; + sp = sp_alloc_struct(dev); + if (!sp) + goto e_err; + + sp_platform = devm_kzalloc(dev, sizeof(*sp_platform), GFP_KERNEL); + if (!sp_platform) + goto e_err; + + sp->dev_specific = sp_platform; + sp->dev_vdata = pdev->dev.of_node ? sp_get_of_version(pdev) + : sp_get_acpi_version(pdev); + if (!sp->dev_vdata) { + ret = -ENODEV; + dev_err(dev, "missing driver data\n"); + goto e_err; + } + + ior = platform_get_resource(pdev, IORESOURCE_MEM, 0); + sp->io_map = devm_ioremap_resource(dev, ior); + if (IS_ERR(sp->io_map)) { + ret = PTR_ERR(sp->io_map); + goto e_err; + } + + attr = device_get_dma_attr(dev); + if (attr == DEV_DMA_NOT_SUPPORTED) { + dev_err(dev, "DMA is not supported"); + goto e_err; + } + + sp_platform->coherent = (attr == DEV_DMA_COHERENT); + if (sp_platform->coherent) + sp->axcache = CACHE_WB_NO_ALLOC; + else + sp->axcache = CACHE_NONE; + + ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48)); + if (ret) { + dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", ret); + goto e_err; + } + + ret = sp_get_irqs(sp); + if (ret) + goto e_err; + + dev_set_drvdata(dev, sp); + + ret = sp_init(sp); + if (ret) + goto e_err; + + dev_notice(dev, "enabled\n"); + + return 0; + +e_err: + dev_notice(dev, "initialization failed\n"); + return ret; +} + +static int sp_platform_remove(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct sp_device *sp = dev_get_drvdata(dev); + + sp_destroy(sp); + + dev_notice(dev, "disabled\n"); + + return 0; +} + +#ifdef CONFIG_PM +static int sp_platform_suspend(struct platform_device *pdev, + pm_message_t state) +{ + struct device *dev = &pdev->dev; + struct sp_device *sp = dev_get_drvdata(dev); + + return sp_suspend(sp, state); +} + +static int sp_platform_resume(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct sp_device *sp = dev_get_drvdata(dev); + + return sp_resume(sp); +} +#endif + +static const struct sp_dev_vdata dev_vdata[] = { + { + .bar = 0, +#ifdef CONFIG_CRYPTO_DEV_SP_CCP + .ccp_vdata = &ccpv3_platform, +#endif + }, +}; + +#ifdef CONFIG_ACPI +static const struct acpi_device_id sp_acpi_match[] = { + { "AMDI0C00", (kernel_ulong_t)&dev_vdata[0] }, + { }, +}; +MODULE_DEVICE_TABLE(acpi, sp_acpi_match); +#endif + +#ifdef CONFIG_OF +static const struct of_device_id sp_of_match[] = { + { .compatible = "amd,ccp-seattle-v1a", + .data = (const void *)&dev_vdata[0] }, + { }, +}; +MODULE_DEVICE_TABLE(of, sp_of_match); +#endif + +static struct platform_driver sp_platform_driver = { + .driver = { + .name = "ccp", +#ifdef CONFIG_ACPI + .acpi_match_table = sp_acpi_match, +#endif +#ifdef CONFIG_OF + .of_match_table = sp_of_match, +#endif + }, + .probe = sp_platform_probe, + .remove = sp_platform_remove, +#ifdef CONFIG_PM + .suspend = sp_platform_suspend, + .resume = sp_platform_resume, +#endif +}; + +int sp_platform_init(void) +{ + return platform_driver_register(&sp_platform_driver); +} + +void sp_platform_exit(void) +{ + platform_driver_unregister(&sp_platform_driver); +} |