183 lines
5 KiB
C
183 lines
5 KiB
C
/*
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* Copyright (C) 2013 Broadcom Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <stdarg.h>
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#include <linux/smp.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <asm/cacheflush.h>
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#include <linux/of_address.h>
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#include "bcm_kona_smc.h"
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static u32 bcm_smc_buffer_phys; /* physical address */
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static void __iomem *bcm_smc_buffer; /* virtual address */
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struct bcm_kona_smc_data {
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unsigned service_id;
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unsigned arg0;
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unsigned arg1;
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unsigned arg2;
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unsigned arg3;
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unsigned result;
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};
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static const struct of_device_id bcm_kona_smc_ids[] __initconst = {
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{.compatible = "brcm,kona-smc"},
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{.compatible = "bcm,kona-smc"}, /* deprecated name */
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{},
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};
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/* Map in the args buffer area */
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int __init bcm_kona_smc_init(void)
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{
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struct device_node *node;
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const __be32 *prop_val;
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u64 prop_size = 0;
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unsigned long buffer_size;
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u32 buffer_phys;
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/* Read buffer addr and size from the device tree node */
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node = of_find_matching_node(NULL, bcm_kona_smc_ids);
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if (!node)
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return -ENODEV;
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prop_val = of_get_address(node, 0, &prop_size, NULL);
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if (!prop_val)
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return -EINVAL;
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/* We assume space for four 32-bit arguments */
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if (prop_size < 4 * sizeof(u32) || prop_size > (u64)ULONG_MAX)
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return -EINVAL;
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buffer_size = (unsigned long)prop_size;
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buffer_phys = be32_to_cpup(prop_val);
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if (!buffer_phys)
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return -EINVAL;
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bcm_smc_buffer = ioremap(buffer_phys, buffer_size);
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if (!bcm_smc_buffer)
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return -ENOMEM;
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bcm_smc_buffer_phys = buffer_phys;
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pr_info("Kona Secure API initialized\n");
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return 0;
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}
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/*
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* int bcm_kona_do_smc(u32 service_id, u32 buffer_addr)
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*
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* Only core 0 can run the secure monitor code. If an "smc" request
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* is initiated on a different core it must be redirected to core 0
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* for execution. We rely on the caller to handle this.
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*
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* Each "smc" request supplies a service id and the address of a
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* buffer containing parameters related to the service to be
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* performed. A flags value defines the behavior of the level 2
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* cache and interrupt handling while the secure monitor executes.
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*
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* Parameters to the "smc" request are passed in r4-r6 as follows:
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* r4 service id
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* r5 flags (SEC_ROM_*)
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* r6 physical address of buffer with other parameters
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*
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* Execution of an "smc" request produces two distinct results.
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*
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* First, the secure monitor call itself (regardless of the specific
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* service request) can succeed, or can produce an error. When an
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* "smc" request completes this value is found in r12; it should
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* always be SEC_EXIT_NORMAL.
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*
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* In addition, the particular service performed produces a result.
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* The values that should be expected depend on the service. We
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* therefore return this value to the caller, so it can handle the
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* request result appropriately. This result value is found in r0
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* when the "smc" request completes.
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*/
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static int bcm_kona_do_smc(u32 service_id, u32 buffer_phys)
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{
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register u32 ip asm("ip"); /* Also called r12 */
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register u32 r0 asm("r0");
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register u32 r4 asm("r4");
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register u32 r5 asm("r5");
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register u32 r6 asm("r6");
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r4 = service_id;
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r5 = 0x3; /* Keep IRQ and FIQ off in SM */
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r6 = buffer_phys;
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asm volatile (
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/* Make sure we got the registers we want */
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__asmeq("%0", "ip")
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__asmeq("%1", "r0")
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__asmeq("%2", "r4")
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__asmeq("%3", "r5")
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__asmeq("%4", "r6")
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#ifdef REQUIRES_SEC
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".arch_extension sec\n"
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#endif
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" smc #0\n"
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: "=r" (ip), "=r" (r0)
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: "r" (r4), "r" (r5), "r" (r6)
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: "r1", "r2", "r3", "r7", "lr");
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BUG_ON(ip != SEC_EXIT_NORMAL);
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return r0;
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}
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/* __bcm_kona_smc() should only run on CPU 0, with pre-emption disabled */
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static void __bcm_kona_smc(void *info)
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{
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struct bcm_kona_smc_data *data = info;
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u32 *args = bcm_smc_buffer;
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BUG_ON(smp_processor_id() != 0);
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BUG_ON(!args);
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/* Copy the four 32 bit argument values into the bounce area */
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writel_relaxed(data->arg0, args++);
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writel_relaxed(data->arg1, args++);
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writel_relaxed(data->arg2, args++);
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writel(data->arg3, args);
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/* Flush caches for input data passed to Secure Monitor */
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flush_cache_all();
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/* Trap into Secure Monitor and record the request result */
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data->result = bcm_kona_do_smc(data->service_id, bcm_smc_buffer_phys);
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}
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unsigned bcm_kona_smc(unsigned service_id, unsigned arg0, unsigned arg1,
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unsigned arg2, unsigned arg3)
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{
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struct bcm_kona_smc_data data;
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data.service_id = service_id;
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data.arg0 = arg0;
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data.arg1 = arg1;
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data.arg2 = arg2;
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data.arg3 = arg3;
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data.result = 0;
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/*
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* Due to a limitation of the secure monitor, we must use the SMP
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* infrastructure to forward all secure monitor calls to Core 0.
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*/
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smp_call_function_single(0, __bcm_kona_smc, &data, 1);
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return data.result;
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}
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