123 lines
2.9 KiB
C
123 lines
2.9 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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struct secure_bridge_data {
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void __iomem *bounce; /* virtual address */
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u32 __iomem buffer_addr; /* physical address */
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int initialized;
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} bridge_data;
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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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};
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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 bounce 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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/* 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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/* Don't care about size or flags of the DT node */
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bridge_data.buffer_addr =
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be32_to_cpu(*of_get_address(node, 0, NULL, NULL));
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BUG_ON(!bridge_data.buffer_addr);
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bridge_data.bounce = of_iomap(node, 0);
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BUG_ON(!bridge_data.bounce);
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bridge_data.initialized = 1;
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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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/* __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 = bridge_data.bounce;
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int rc = 0;
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/* Must run on CPU 0 */
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BUG_ON(smp_processor_id() != 0);
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/* Check map in the bounce area */
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BUG_ON(!bridge_data.initialized);
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/* Copy one 32 bit word into the bounce area */
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args[0] = data->arg0;
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args[1] = data->arg1;
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args[2] = data->arg2;
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args[3] = data->arg3;
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/* Flush caches for input data passed to Secure Monitor */
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if (data->service_id != SSAPI_BRCM_START_VC_CORE)
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flush_cache_all();
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/* Trap into Secure Monitor */
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rc = bcm_kona_smc_asm(data->service_id, bridge_data.buffer_addr);
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if (rc != SEC_ROM_RET_OK)
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pr_err("Secure Monitor call failed (0x%x)!\n", rc);
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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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/*
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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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if (get_cpu() != 0)
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smp_call_function_single(0, __bcm_kona_smc, (void *)&data, 1);
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else
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__bcm_kona_smc(&data);
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put_cpu();
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return 0;
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}
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