// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2016 Siarhei Siamashka */ #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_SPL_OS_BOOT #error CONFIG_SPL_OS_BOOT is not supported yet #endif /* * This is a very simple U-Boot image loading implementation, trying to * replicate what the boot ROM is doing when loading the SPL. Because we * know the exact pins where the SPI Flash is connected and also know * that the Read Data Bytes (03h) command is supported, the hardware * configuration is very simple and we don't need the extra flexibility * of the SPI framework. Moreover, we rely on the default settings of * the SPI controler hardware registers and only adjust what needs to * be changed. This is good for the code size and this implementation * adds less than 400 bytes to the SPL. * * There are two variants of the SPI controller in Allwinner SoCs: * A10/A13/A20 (sun4i variant) and everything else (sun6i variant). * Both of them are supported. * * The pin mixing part is SoC specific and only A10/A13/A20/H3/A64 are * supported at the moment. */ /*****************************************************************************/ /* SUN4I variant of the SPI controller */ /*****************************************************************************/ #define SUN4I_SPI0_CCTL 0x1C #define SUN4I_SPI0_CTL 0x08 #define SUN4I_SPI0_RX 0x00 #define SUN4I_SPI0_TX 0x04 #define SUN4I_SPI0_FIFO_STA 0x28 #define SUN4I_SPI0_BC 0x20 #define SUN4I_SPI0_TC 0x24 #define SUN4I_CTL_ENABLE BIT(0) #define SUN4I_CTL_MASTER BIT(1) #define SUN4I_CTL_TF_RST BIT(8) #define SUN4I_CTL_RF_RST BIT(9) #define SUN4I_CTL_XCH BIT(10) /*****************************************************************************/ /* SUN6I variant of the SPI controller */ /*****************************************************************************/ #define SUN6I_SPI0_CCTL 0x24 #define SUN6I_SPI0_GCR 0x04 #define SUN6I_SPI0_TCR 0x08 #define SUN6I_SPI0_FIFO_STA 0x1C #define SUN6I_SPI0_MBC 0x30 #define SUN6I_SPI0_MTC 0x34 #define SUN6I_SPI0_BCC 0x38 #define SUN6I_SPI0_TXD 0x200 #define SUN6I_SPI0_RXD 0x300 #define SUN6I_CTL_ENABLE BIT(0) #define SUN6I_CTL_MASTER BIT(1) #define SUN6I_CTL_SRST BIT(31) #define SUN6I_TCR_XCH BIT(31) /*****************************************************************************/ #define CCM_AHB_GATING0 (0x01C20000 + 0x60) #define CCM_H6_SPI_BGR_REG (0x03001000 + 0x96c) #ifdef CONFIG_MACH_SUN50I_H6 #define CCM_SPI0_CLK (0x03001000 + 0x940) #else #define CCM_SPI0_CLK (0x01C20000 + 0xA0) #endif #define SUN6I_BUS_SOFT_RST_REG0 (0x01C20000 + 0x2C0) #define AHB_RESET_SPI0_SHIFT 20 #define AHB_GATE_OFFSET_SPI0 20 #define SPI0_CLK_DIV_BY_2 0x1000 #define SPI0_CLK_DIV_BY_4 0x1001 /*****************************************************************************/ /* * Allwinner A10/A20 SoCs were using pins PC0,PC1,PC2,PC23 for booting * from SPI Flash, everything else is using pins PC0,PC1,PC2,PC3. * The H6 uses PC0, PC2, PC3, PC5. */ static void spi0_pinmux_setup(unsigned int pin_function) { /* All chips use PC0 and PC2. */ sunxi_gpio_set_cfgpin(SUNXI_GPC(0), pin_function); sunxi_gpio_set_cfgpin(SUNXI_GPC(2), pin_function); /* All chips except H6 use PC1, and only H6 uses PC5. */ if (!IS_ENABLED(CONFIG_MACH_SUN50I_H6)) sunxi_gpio_set_cfgpin(SUNXI_GPC(1), pin_function); else sunxi_gpio_set_cfgpin(SUNXI_GPC(5), pin_function); /* Older generations use PC23 for CS, newer ones use PC3. */ if (IS_ENABLED(CONFIG_MACH_SUN4I) || IS_ENABLED(CONFIG_MACH_SUN7I) || IS_ENABLED(CONFIG_MACH_SUN8I_R40)) sunxi_gpio_set_cfgpin(SUNXI_GPC(23), pin_function); else sunxi_gpio_set_cfgpin(SUNXI_GPC(3), pin_function); } static bool is_sun6i_gen_spi(void) { return IS_ENABLED(CONFIG_SUNXI_GEN_SUN6I) || IS_ENABLED(CONFIG_MACH_SUN50I_H6); } static uintptr_t spi0_base_address(void) { if (IS_ENABLED(CONFIG_MACH_SUN8I_R40)) return 0x01C05000; if (IS_ENABLED(CONFIG_MACH_SUN50I_H6)) return 0x05010000; if (!is_sun6i_gen_spi()) return 0x01C05000; return 0x01C68000; } /* * Setup 6 MHz from OSC24M (because the BROM is doing the same). */ static void spi0_enable_clock(void) { uintptr_t base = spi0_base_address(); /* Deassert SPI0 reset on SUN6I */ if (IS_ENABLED(CONFIG_MACH_SUN50I_H6)) setbits_le32(CCM_H6_SPI_BGR_REG, (1U << 16) | 0x1); else if (is_sun6i_gen_spi()) setbits_le32(SUN6I_BUS_SOFT_RST_REG0, (1 << AHB_RESET_SPI0_SHIFT)); /* Open the SPI0 gate */ if (!IS_ENABLED(CONFIG_MACH_SUN50I_H6)) setbits_le32(CCM_AHB_GATING0, (1 << AHB_GATE_OFFSET_SPI0)); /* Divide by 4 */ writel(SPI0_CLK_DIV_BY_4, base + (is_sun6i_gen_spi() ? SUN6I_SPI0_CCTL : SUN4I_SPI0_CCTL)); /* 24MHz from OSC24M */ writel((1 << 31), CCM_SPI0_CLK); if (is_sun6i_gen_spi()) { /* Enable SPI in the master mode and do a soft reset */ setbits_le32(base + SUN6I_SPI0_GCR, SUN6I_CTL_MASTER | SUN6I_CTL_ENABLE | SUN6I_CTL_SRST); /* Wait for completion */ while (readl(base + SUN6I_SPI0_GCR) & SUN6I_CTL_SRST) ; } else { /* Enable SPI in the master mode and reset FIFO */ setbits_le32(base + SUN4I_SPI0_CTL, SUN4I_CTL_MASTER | SUN4I_CTL_ENABLE | SUN4I_CTL_TF_RST | SUN4I_CTL_RF_RST); } } static void spi0_disable_clock(void) { uintptr_t base = spi0_base_address(); /* Disable the SPI0 controller */ if (is_sun6i_gen_spi()) clrbits_le32(base + SUN6I_SPI0_GCR, SUN6I_CTL_MASTER | SUN6I_CTL_ENABLE); else clrbits_le32(base + SUN4I_SPI0_CTL, SUN4I_CTL_MASTER | SUN4I_CTL_ENABLE); /* Disable the SPI0 clock */ writel(0, CCM_SPI0_CLK); /* Close the SPI0 gate */ if (!IS_ENABLED(CONFIG_MACH_SUN50I_H6)) clrbits_le32(CCM_AHB_GATING0, (1 << AHB_GATE_OFFSET_SPI0)); /* Assert SPI0 reset on SUN6I */ if (IS_ENABLED(CONFIG_MACH_SUN50I_H6)) clrbits_le32(CCM_H6_SPI_BGR_REG, (1U << 16) | 0x1); else if (is_sun6i_gen_spi()) clrbits_le32(SUN6I_BUS_SOFT_RST_REG0, (1 << AHB_RESET_SPI0_SHIFT)); } static void spi0_init(void) { unsigned int pin_function = SUNXI_GPC_SPI0; if (IS_ENABLED(CONFIG_MACH_SUN50I) || IS_ENABLED(CONFIG_MACH_SUN50I_H6)) pin_function = SUN50I_GPC_SPI0; spi0_pinmux_setup(pin_function); spi0_enable_clock(); } static void spi0_deinit(void) { /* New SoCs can disable pins, older could only set them as input */ unsigned int pin_function = SUNXI_GPIO_INPUT; if (is_sun6i_gen_spi()) pin_function = SUNXI_GPIO_DISABLE; spi0_disable_clock(); spi0_pinmux_setup(pin_function); } /*****************************************************************************/ #define SPI_READ_MAX_SIZE 60 /* FIFO size, minus 4 bytes of the header */ static void sunxi_spi0_read_data(u8 *buf, u32 addr, u32 bufsize, ulong spi_ctl_reg, ulong spi_ctl_xch_bitmask, ulong spi_fifo_reg, ulong spi_tx_reg, ulong spi_rx_reg, ulong spi_bc_reg, ulong spi_tc_reg, ulong spi_bcc_reg) { writel(4 + bufsize, spi_bc_reg); /* Burst counter (total bytes) */ writel(4, spi_tc_reg); /* Transfer counter (bytes to send) */ if (spi_bcc_reg) writel(4, spi_bcc_reg); /* SUN6I also needs this */ /* Send the Read Data Bytes (03h) command header */ writeb(0x03, spi_tx_reg); writeb((u8)(addr >> 16), spi_tx_reg); writeb((u8)(addr >> 8), spi_tx_reg); writeb((u8)(addr), spi_tx_reg); /* Start the data transfer */ setbits_le32(spi_ctl_reg, spi_ctl_xch_bitmask); /* Wait until everything is received in the RX FIFO */ while ((readl(spi_fifo_reg) & 0x7F) < 4 + bufsize) ; /* Skip 4 bytes */ readl(spi_rx_reg); /* Read the data */ while (bufsize-- > 0) *buf++ = readb(spi_rx_reg); /* tSHSL time is up to 100 ns in various SPI flash datasheets */ udelay(1); } static void spi0_read_data(void *buf, u32 addr, u32 len) { u8 *buf8 = buf; u32 chunk_len; uintptr_t base = spi0_base_address(); while (len > 0) { chunk_len = len; if (chunk_len > SPI_READ_MAX_SIZE) chunk_len = SPI_READ_MAX_SIZE; if (is_sun6i_gen_spi()) { sunxi_spi0_read_data(buf8, addr, chunk_len, base + SUN6I_SPI0_TCR, SUN6I_TCR_XCH, base + SUN6I_SPI0_FIFO_STA, base + SUN6I_SPI0_TXD, base + SUN6I_SPI0_RXD, base + SUN6I_SPI0_MBC, base + SUN6I_SPI0_MTC, base + SUN6I_SPI0_BCC); } else { sunxi_spi0_read_data(buf8, addr, chunk_len, base + SUN4I_SPI0_CTL, SUN4I_CTL_XCH, base + SUN4I_SPI0_FIFO_STA, base + SUN4I_SPI0_TX, base + SUN4I_SPI0_RX, base + SUN4I_SPI0_BC, base + SUN4I_SPI0_TC, 0); } len -= chunk_len; buf8 += chunk_len; addr += chunk_len; } } static ulong spi_load_read(struct spl_load_info *load, ulong sector, ulong count, void *buf) { spi0_read_data(buf, sector, count); return count; } /*****************************************************************************/ static int spl_spi_load_image(struct spl_image_info *spl_image, struct spl_boot_device *bootdev) { int ret = 0; struct image_header *header; header = (struct image_header *)(CONFIG_SYS_TEXT_BASE); int load_offset = readl(SPL_ADDR + 0x10); load_offset = max(load_offset, CONFIG_SYS_SPI_U_BOOT_OFFS); spi0_init(); spi0_read_data((void *)header, load_offset, 0x40); if (IS_ENABLED(CONFIG_SPL_LOAD_FIT) && image_get_magic(header) == FDT_MAGIC) { struct spl_load_info load; debug("Found FIT image\n"); load.dev = NULL; load.priv = NULL; load.filename = NULL; load.bl_len = 1; load.read = spi_load_read; ret = spl_load_simple_fit(spl_image, &load, load_offset, header); } else { ret = spl_parse_image_header(spl_image, bootdev, header); if (ret) return ret; spi0_read_data((void *)spl_image->load_addr, load_offset, spl_image->size); } spi0_deinit(); return ret; } /* Use priorty 0 to override the default if it happens to be linked in */ SPL_LOAD_IMAGE_METHOD("sunxi SPI", 0, BOOT_DEVICE_SPI, spl_spi_load_image);