diff options
Diffstat (limited to 'drivers/crypto/pka_4xx_access.c')
| -rw-r--r-- | drivers/crypto/pka_4xx_access.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/drivers/crypto/pka_4xx_access.c b/drivers/crypto/pka_4xx_access.c new file mode 100644 index 00000000000..c2452bdc749 --- /dev/null +++ b/drivers/crypto/pka_4xx_access.c @@ -0,0 +1,201 @@ +/******************************************************************************* + * + * Copyright (c) 2008 Loc Ho <lho@amcc.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * + * Detail Description: + * This file defines ioctl structures for the Linux CryptoAPI interface. It + * provides user space applications accesss into the Linux CryptoAPI + * functionalities. + * + * @file pka4xx_acccess.c + * + * This file provides access and implementation of the PKA hardware + * under Linux. + * + ******************************************************************************* + */ +#include <linux/version.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/platform_device.h> +#include <linux/of_platform.h> +#include <linux/interrupt.h> +#include <asm/io.h> +#include <crypto/pka_4xx.h> +#include "pka_4xx_access.h" + +#define PKA4XX_VER_STR "0.1" + +struct pka4xx_dev { + struct pka4xx_ctx ctx; + struct resource csr_res; + struct resource pka_ram_res; +}; + +struct hal_config { + struct of_device *ofdev; +}; + +static struct pka4xx_dev pka_dev = { + .ctx = { + 0, + { { 1, PKA4XX_RAM_FREE_SIZE/4, 0 }, + { 0, 0, 0 } }, + 0, 0 + } +}; + +struct pka4xx_ctx *pka_get_ctx(void) +{ + return &pka_dev.ctx; +} + +int pka4xx_config_set(struct hal_config *cfg) +{ + struct device_node *pka_np = cfg->ofdev->node; + int rc = 0; + + rc = of_address_to_resource(pka_np, 0, &pka_dev.csr_res); + if (rc) { + LPRINTF(LL_INFO, "error getting address to resource"); + return -ENODEV; + } + pka_dev.ctx.csr_paddr = pka_dev.csr_res.start; + pka_dev.ctx.csr = ioremap(pka_dev.csr_res.start, + pka_dev.csr_res.end - pka_dev.csr_res.start + 1); + + if (pka_dev.ctx.csr == NULL) { + LPRINTF(LL_ERR, + "unable to ioremap 0x%02X_%08X size %d", + (u32) (pka_dev.csr_res.start >> 32), + (u32) pka_dev.csr_res.start, + (u32) (pka_dev.csr_res.end - pka_dev.csr_res.start + 1)); + return -ENOMEM; + } + + pka_dev.ctx.irq = of_irq_to_resource(pka_np, 0, NULL); + + if (pka_dev.ctx.irq == NO_IRQ) { + /* Un-map CSR */ + iounmap(pka_dev.ctx.csr); + pka_dev.ctx.csr = NULL; + LPRINTF(LL_ERR, "no irq"); + return -EINVAL; + } + + return 0; +} + +int pka4xx_config_clear(void) +{ + iounmap(pka_dev.ctx.csr); + return 0; +} + +int pka4xx_csr_hw_read32(u32 reg_addr, u32 *data_val) +{ + *data_val = in_le32((volatile unsigned __iomem *) + (pka_dev.ctx.csr + reg_addr)); + return 0; +} + +int pka4xx_csr_hw_write32(u32 reg_addr, u32 data_val) +{ + out_le32((volatile unsigned __iomem *) (pka_dev.ctx.csr + reg_addr), + data_val); + return 0; +} + +/** + * Setup Driver with platform registration + */ +static int __devinit pka4xx_probe(struct of_device *ofdev, + const struct of_device_id *match) +{ + struct hal_config hw_cfg; + int rc; + + hw_cfg.ofdev = ofdev; + rc = pka4xx_config_set(&hw_cfg); + if (rc != 0) + return rc; + + printk(KERN_INFO "AMCC 4xx PKA v%s @0x%02X_%08X size %d IRQ %d\n", + PKA4XX_VER_STR, + (u32) (pka_dev.csr_res.start >> 32), + (u32) pka_dev.csr_res.start, + (u32) (pka_dev.csr_res.end - pka_dev.csr_res.start + 1), + pka_dev.ctx.irq); + + rc = pka4xx_hw_init(); + if (rc < 0) { + LPRINTF(LL_ERR, "failed to initialize PKA"); + goto err; + } + printk(KERN_INFO "PKA Driver Successfully Initialized\n"); + return rc; + +err: + pka4xx_config_clear(); + return rc; +} + +static int __devexit pka4xx_remove(struct of_device *dev) +{ + pka4xx_hw_deinit(); + pka4xx_config_clear(); + return 0; +} + +static struct of_device_id pka4xx_match[] = { + { .compatible = "ppc4xx-pka", }, + { .compatible = "amcc,ppc4xx-pka", }, + { }, +}; + +static struct of_platform_driver pka4xx_driver = { + .name = "ppc4xx-pka", + .match_table = pka4xx_match, + .probe = pka4xx_probe, + .remove = pka4xx_remove, +}; + +static int __init mod_init(void) +{ + return of_register_platform_driver(&pka4xx_driver); +} + +static void __exit mod_exit(void) +{ + of_unregister_platform_driver(&pka4xx_driver); +} + +module_init(mod_init); +module_exit(mod_exit); + +MODULE_DESCRIPTION("AMCC 4xx Public Key Accelerator"); +MODULE_LICENSE("GPL"); + +EXPORT_SYMBOL_GPL(pka4xx_mul); +EXPORT_SYMBOL_GPL(pka4xx_div); +EXPORT_SYMBOL_GPL(pka4xx_mod); +EXPORT_SYMBOL_GPL(pka4xx_add); +EXPORT_SYMBOL_GPL(pka4xx_sub); +EXPORT_SYMBOL_GPL(pka4xx_addsub); +EXPORT_SYMBOL_GPL(pka4xx_rshift); +EXPORT_SYMBOL_GPL(pka4xx_lshift); +EXPORT_SYMBOL_GPL(pka4xx_compare); +EXPORT_SYMBOL_GPL(pka4xx_expmod); +EXPORT_SYMBOL_GPL(pka4xx_expmod_crt); + |