arm/mach-sunxi/spl_spi_sunxi.c

1 // SPDX-License-Identifier: GPL-2.0+
17  * This is a very simple U-Boot image loading implementation, trying to
19  * know the exact pins where the SPI Flash is connected and also know
22  * of the SPI framework. Moreover, we rely on the default settings of
23  * the SPI controler hardware registers and only adjust what needs to
27  * There are two variants of the SPI controller in Allwinner SoCs:
28  * A10/A13/A20 (sun4i variant) and everything else (sun6i variant).
31  * The pin mixing part is SoC specific and only A10/A13/A20/H3/A64 are
36 /* SUN4I variant of the SPI controller                                       */
54 /* SUN6I variant of the SPI controller                                       */
87  * Allwinner A10/A20 SoCs were using pins PC0,PC1,PC2,PC23 for booting
88  * from SPI Flash, everything else is using pins PC0,PC1,PC2,PC3.
123 		/* Enable SPI in the master mode and do a soft reset */  in spi0_enable_clock()
131 		/* Enable SPI in the master mode and reset FIFO */  in spi0_enable_clock()
219 	while (bufsize-- > 0)  in sunxi_spi0_read_data()
222 	/* tSHSL time is up to 100 ns in various SPI flash datasheets */  in sunxi_spi0_read_data()
258 		len  -= chunk_len;  in spi0_read_data()
302 		spi0_read_data((void *)spl_image->load_addr,  in spl_spi_load_image()
303 			       CONFIG_SYS_SPI_U_BOOT_OFFS, spl_image->size);  in spl_spi_load_image()
311 SPL_LOAD_IMAGE_METHOD("sunxi SPI", 0, BOOT_DEVICE_SPI, spl_spi_load_image);