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Baikal-T1 Boot Controller provides an access to a RO storages, which are physically mapped into the SoC MMIO space. In particularly there are Internal ROM embedded into the SoC with a pre-installed firmware, externally attached SPI flash (also accessed in the read-only mode) and a memory region, which mirrors one of them in accordance with the currently enabled system boot mode (also called Boot ROM). This commit adds the Internal ROM support to the physmap driver of the MTD kernel subsystem. The driver will create the Internal ROM MTD as long as it is defined in the system dts file. The physically mapped SPI flash region will be used to implement the SPI-mem interface. The mirroring memory region won't be accessible directly since it's redundant due to both bootable regions being exposed anyway. Note we had to create a dedicated code for the ROMs since read from the corresponding memory regions must be done via the dword-aligned addresses. Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru> Cc: Pavel Parkhomenko <Pavel.Parkhomenko@baikalelectronics.ru> Cc: Lee Jones <lee.jones@linaro.org> Cc: linux-mips@vger.kernel.org Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/linux-mtd/20200920111445.21816-1-Sergey.Semin@baikalelectronics.ru
18 lines
401 B
C
18 lines
401 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#include <linux/mtd/map.h>
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#include <linux/of.h>
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#ifdef CONFIG_MTD_PHYSMAP_BT1_ROM
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int of_flash_probe_bt1_rom(struct platform_device *pdev,
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struct device_node *np,
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struct map_info *map);
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#else
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static inline
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int of_flash_probe_bt1_rom(struct platform_device *pdev,
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struct device_node *np,
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struct map_info *map)
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{
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return 0;
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}
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#endif
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