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3a76b35186
The current bcm_kona_smc_init function throws a BUG_ON if there's no SMC device node defined in the device tree. Since secure API access is optional depending the chip configuration, fix this by allowing the rest of the code to run even if there's no SMC device node defined Signed-off-by: Christian Daudt <csd@broadcom.com> Reviewed-by: Markus Mayer <markus.mayer@linaro.org>
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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