sunxi/nand: Add support to the SPL for loading u-boot from internal NAND memory
This commit adds support to the sunxi SPL to load u-boot from the internal
NAND. Note this only adds support to access the boot partitions to load
u-boot, full NAND support to load the kernel, etc. from the nand data
partition will come later.
Signed-off-by: Roy Spliet <r.spliet@ultimaker.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
diff --git a/drivers/mtd/nand/sunxi_nand_spl.c b/drivers/mtd/nand/sunxi_nand_spl.c
new file mode 100644
index 0000000..75982f5
--- /dev/null
+++ b/drivers/mtd/nand/sunxi_nand_spl.c
@@ -0,0 +1,273 @@
+/*
+ * Copyright (c) 2014, Antmicro Ltd <www.antmicro.com>
+ * Copyright (c) 2015, Turtle Solutions <www.turtle-solutions.eu>
+ * Copyright (c) 2015, Roy Spliet <rspliet@ultimaker.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ *
+ * \todo Detect chip parameters (page size, ECC mode, randomisation...)
+ */
+
+#include <common.h>
+#include <config.h>
+#include <asm/io.h>
+#include <nand.h>
+#include <asm/arch/cpu.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/dma.h>
+#include <asm/arch/nand.h>
+
+void
+nand_init(void)
+{
+ struct sunxi_ccm_reg * const ccm =
+ (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
+ struct sunxi_nand * const nand = (struct sunxi_nand *)SUNXI_NFC_BASE;
+ u32 val;
+
+ board_nand_init();
+
+ /* "un-gate" NAND clock and clock source
+ * This assumes that the clock was already correctly configured by
+ * BootROM */
+ setbits_le32(&ccm->ahb_gate0, (1 << AHB_GATE_OFFSET_NAND0));
+#ifdef CONFIG_MACH_SUN9I
+ setbits_le32(&ccm->ahb_gate1, (1 << AHB_GATE_OFFSET_DMA));
+#else
+ setbits_le32(&ccm->ahb_gate0, (1 << AHB_GATE_OFFSET_DMA));
+#endif
+ setbits_le32(&ccm->nand0_clk_cfg, 0x80000000);
+
+ val = readl(&nand->ctl);
+ val |= SUNXI_NAND_CTL_RST;
+ writel(val, &nand->ctl);
+
+ /* Wait until reset pin is deasserted */
+ do {
+ val = readl(&nand->ctl);
+ if (!(val & SUNXI_NAND_CTL_RST))
+ break;
+ } while (1);
+
+ /** \todo Chip select, currently kind of static */
+ val = readl(&nand->ctl);
+ val &= 0xf0fff0f2;
+ val |= SUNXI_NAND_CTL_EN;
+ val |= SUNXI_NAND_CTL_PAGE_SIZE(CONFIG_NAND_SUNXI_PAGE_SIZE);
+ writel(val, &nand->ctl);
+
+ writel(0x100, &nand->timing_ctl);
+ writel(0x7ff, &nand->timing_cfg);
+
+ /* reset CMD */
+ val = SUNXI_NAND_CMD_SEND_CMD1 | SUNXI_NAND_CMD_WAIT_FLAG |
+ NAND_CMD_RESET;
+ writel(val, &nand->cmd);
+ do {
+ val = readl(&nand->st);
+ if (val & (1<<1))
+ break;
+ udelay(1000);
+ } while (1);
+
+ printf("Nand initialised\n");
+}
+
+int
+nand_wait_timeout(u32 *reg, u32 mask, u32 val)
+{
+ unsigned long tmo = timer_get_us() + 1000000; /* 1s */
+
+ while ((readl(reg) & mask) != val) {
+ if (timer_get_us() > tmo)
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
+/* random seed */
+static const uint16_t random_seed[128] = {
+ 0x2b75, 0x0bd0, 0x5ca3, 0x62d1, 0x1c93, 0x07e9, 0x2162, 0x3a72,
+ 0x0d67, 0x67f9, 0x1be7, 0x077d, 0x032f, 0x0dac, 0x2716, 0x2436,
+ 0x7922, 0x1510, 0x3860, 0x5287, 0x480f, 0x4252, 0x1789, 0x5a2d,
+ 0x2a49, 0x5e10, 0x437f, 0x4b4e, 0x2f45, 0x216e, 0x5cb7, 0x7130,
+ 0x2a3f, 0x60e4, 0x4dc9, 0x0ef0, 0x0f52, 0x1bb9, 0x6211, 0x7a56,
+ 0x226d, 0x4ea7, 0x6f36, 0x3692, 0x38bf, 0x0c62, 0x05eb, 0x4c55,
+ 0x60f4, 0x728c, 0x3b6f, 0x2037, 0x7f69, 0x0936, 0x651a, 0x4ceb,
+ 0x6218, 0x79f3, 0x383f, 0x18d9, 0x4f05, 0x5c82, 0x2912, 0x6f17,
+ 0x6856, 0x5938, 0x1007, 0x61ab, 0x3e7f, 0x57c2, 0x542f, 0x4f62,
+ 0x7454, 0x2eac, 0x7739, 0x42d4, 0x2f90, 0x435a, 0x2e52, 0x2064,
+ 0x637c, 0x66ad, 0x2c90, 0x0bad, 0x759c, 0x0029, 0x0986, 0x7126,
+ 0x1ca7, 0x1605, 0x386a, 0x27f5, 0x1380, 0x6d75, 0x24c3, 0x0f8e,
+ 0x2b7a, 0x1418, 0x1fd1, 0x7dc1, 0x2d8e, 0x43af, 0x2267, 0x7da3,
+ 0x4e3d, 0x1338, 0x50db, 0x454d, 0x764d, 0x40a3, 0x42e6, 0x262b,
+ 0x2d2e, 0x1aea, 0x2e17, 0x173d, 0x3a6e, 0x71bf, 0x25f9, 0x0a5d,
+ 0x7c57, 0x0fbe, 0x46ce, 0x4939, 0x6b17, 0x37bb, 0x3e91, 0x76db,
+};
+
+uint32_t ecc_errors = 0;
+
+static void
+nand_config_ecc(struct sunxi_nand *nand, uint32_t page, int syndrome)
+{
+ static u8 strength[] = {16, 24, 28, 32, 40, 48, 56, 60, 64};
+ int i;
+ uint32_t ecc_mode;
+ u32 ecc;
+ u16 seed = 0;
+
+ for (i = 0; i < ARRAY_SIZE(strength); i++) {
+ if (CONFIG_NAND_SUNXI_ECC_STRENGTH == strength[i]) {
+ ecc_mode = i;
+ break;
+ }
+ }
+
+ if (i == ARRAY_SIZE(strength)) {
+ printf("ECC strength unsupported\n");
+ return;
+ }
+
+ ecc = SUNXI_NAND_ECC_CTL_ECC_EN |
+ SUNXI_NAND_ECC_CTL_PIPELINE |
+ SUNXI_NAND_ECC_CTL_RND_EN |
+ SUNXI_NAND_ECC_CTL_MODE(ecc_mode);
+
+ if (CONFIG_NAND_SUNXI_ECC_STEP == 512)
+ ecc |= SUNXI_NAND_ECC_CTL_BS_512B;
+
+ if (syndrome)
+ seed = 0x4A80;
+ else
+ seed = random_seed[page % ARRAY_SIZE(random_seed)];
+
+ ecc |= SUNXI_NAND_ECC_CTL_RND_SEED(seed);
+
+ writel(ecc, &nand->ecc_ctl);
+}
+
+/* read CONFIG_NAND_SUNXI_ECC_STEP bytes from real_addr to temp_buf */
+void
+nand_read_block(struct sunxi_nand *nand, phys_addr_t src, dma_addr_t dst,
+ int syndrome)
+{
+ struct sunxi_dma * const dma = (struct sunxi_dma *)SUNXI_DMA_BASE;
+ struct sunxi_dma_cfg * const dma_cfg = &dma->ddma[0];
+
+ uint32_t shift;
+ uint32_t page;
+ uint32_t addr;
+ uint32_t oob_offset;
+ uint32_t ecc_bytes;
+ u32 val;
+ u32 cmd;
+
+ page = src / CONFIG_NAND_SUNXI_PAGE_SIZE;
+ if (page > 0xFFFF) {
+ /* TODO: currently this is not supported */
+ printf("Reading from address >= %08X is not allowed.\n",
+ 0xFFFF * CONFIG_NAND_SUNXI_PAGE_SIZE);
+ return;
+ }
+
+ shift = src % CONFIG_NAND_SUNXI_PAGE_SIZE;
+ writel(0, &nand->ecc_st);
+
+ /* ECC_CTL, randomization */
+ ecc_bytes = CONFIG_NAND_SUNXI_ECC_STRENGTH *
+ fls(CONFIG_NAND_SUNXI_ECC_STEP * 8);
+ ecc_bytes = DIV_ROUND_UP(ecc_bytes, 8);
+ ecc_bytes += (ecc_bytes & 1); /* Align to 2-bytes */
+ ecc_bytes += 4;
+
+ nand_config_ecc(nand, page, syndrome);
+ if (syndrome) {
+ /* shift every 1kB in syndrome */
+ shift += (shift / CONFIG_NAND_SUNXI_ECC_STEP) * ecc_bytes;
+ oob_offset = CONFIG_NAND_SUNXI_ECC_STEP + shift;
+ } else {
+ oob_offset = CONFIG_NAND_SUNXI_PAGE_SIZE +
+ (shift / CONFIG_NAND_SUNXI_ECC_STEP) * ecc_bytes;
+ }
+
+ addr = (page << 16) | shift;
+
+ /* DMA */
+ val = readl(&nand->ctl);
+ writel(val | SUNXI_NAND_CTL_RAM_METHOD_DMA, &nand->ctl);
+
+ writel(oob_offset, &nand->spare_area);
+
+ /* DMAC
+ * \todo Separate this into a tidy driver */
+ writel(0x0, &dma->irq_en); /* clear dma interrupts */
+ writel((uint32_t) &nand->io_data , &dma_cfg->src_addr);
+ writel(dst , &dma_cfg->dst_addr);
+ writel(0x00007F0F , &dma_cfg->ddma_para);
+ writel(CONFIG_NAND_SUNXI_ECC_STEP, &dma_cfg->bc);
+
+ val = SUNXI_DMA_CTL_SRC_DRQ(DDMA_SRC_DRQ_NAND) |
+ SUNXI_DMA_CTL_MODE_IO |
+ SUNXI_DMA_CTL_SRC_DATA_WIDTH_32 |
+ SUNXI_DMA_CTL_DST_DRQ(DDMA_DST_DRQ_SDRAM) |
+ SUNXI_DMA_CTL_DST_DATA_WIDTH_32 |
+ SUNXI_DMA_CTL_TRIGGER;
+ writel(val, &dma_cfg->ctl);
+
+ writel(0x00E00530, &nand->rcmd_set);
+ nand_wait_timeout(&nand->st, SUNXI_NAND_ST_FIFO_FULL, 0);
+
+ writel(1 , &nand->block_num);
+ writel(addr, &nand->addr_low);
+ writel(0 , &nand->addr_high);
+
+ /* CMD (PAGE READ) */
+ cmd = 0x85E80000;
+ cmd |= SUNXI_NAND_CMD_ADDR_CYCLES(CONFIG_NAND_SUNXI_ADDR_CYCLES);
+ cmd |= (syndrome ? SUNXI_NAND_CMD_ORDER_SEQ :
+ SUNXI_NAND_CMD_ORDER_INTERLEAVE);
+ writel(cmd, &nand->cmd);
+
+ if(nand_wait_timeout(&nand->st, SUNXI_NAND_ST_DMA_INT,
+ SUNXI_NAND_ST_DMA_INT)) {
+ printf("NAND timeout reading data\n");
+ return;
+ }
+
+ if(nand_wait_timeout(&dma_cfg->ctl, SUNXI_DMA_CTL_TRIGGER, 0)) {
+ printf("NAND timeout reading data\n");
+ return;
+ }
+
+ if (readl(&nand->ecc_st))
+ ecc_errors++;
+}
+
+int
+nand_spl_load_image(uint32_t offs, unsigned int size, void *dest)
+{
+ struct sunxi_nand * const nand = (struct sunxi_nand *)SUNXI_NFC_BASE;
+ dma_addr_t dst_block;
+ dma_addr_t dst_end;
+ phys_addr_t addr = offs;
+
+ dst_end = ((dma_addr_t) dest) + size;
+
+ memset((void *)dest, 0x0, size);
+ ecc_errors = 0;
+ for (dst_block = (dma_addr_t) dest; dst_block < dst_end;
+ dst_block += CONFIG_NAND_SUNXI_ECC_STEP,
+ addr += CONFIG_NAND_SUNXI_ECC_STEP) {
+ /* syndrome read first 4MiB to match Allwinner BootROM */
+ nand_read_block(nand, addr, dst_block, addr < 0x400000);
+ }
+
+ if (ecc_errors)
+ printf("Error: %d ECC failures detected\n", ecc_errors);
+ return ecc_errors == 0;
+}
+
+void
+nand_deselect(void)
+{}