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u-boot/drivers/mtd/nand/sunxi_nand_spl.c
Hans de Goede 5d65c67bf1 sunxi_nand_spl: Turn off clocks when we're done with the nand 
Turn off the nand and dma clocks when we're done with the nand, this
puts the nand and dma controllers back into a clean state for when the
kernel boots.

Without this the kernel will not boot properly when it is built with
dma-controller support.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
2015-08-31 08:43:41 +02:00

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/*
* Copyright (c) 2014-2015, Antmicro Ltd <www.antmicro.com>
* Copyright (c) 2015, AW-SOM Technologies <www.aw-som.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <asm/arch/clock.h>
#include <asm/io.h>
#include <common.h>
#include <config.h>
#include <nand.h>
/* registers */
#define NFC_CTL 0x00000000
#define NFC_ST 0x00000004
#define NFC_INT 0x00000008
#define NFC_TIMING_CTL 0x0000000C
#define NFC_TIMING_CFG 0x00000010
#define NFC_ADDR_LOW 0x00000014
#define NFC_ADDR_HIGH 0x00000018
#define NFC_SECTOR_NUM 0x0000001C
#define NFC_CNT 0x00000020
#define NFC_CMD 0x00000024
#define NFC_RCMD_SET 0x00000028
#define NFC_WCMD_SET 0x0000002C
#define NFC_IO_DATA 0x00000030
#define NFC_ECC_CTL 0x00000034
#define NFC_ECC_ST 0x00000038
#define NFC_DEBUG 0x0000003C
#define NFC_ECC_CNT0 0x00000040
#define NFC_ECC_CNT1 0x00000044
#define NFC_ECC_CNT2 0x00000048
#define NFC_ECC_CNT3 0x0000004C
#define NFC_USER_DATA_BASE 0x00000050
#define NFC_EFNAND_STATUS 0x00000090
#define NFC_SPARE_AREA 0x000000A0
#define NFC_PATTERN_ID 0x000000A4
#define NFC_RAM0_BASE 0x00000400
#define NFC_RAM1_BASE 0x00000800
#define NFC_CTL_EN (1 << 0)
#define NFC_CTL_RESET (1 << 1)
#define NFC_CTL_RAM_METHOD (1 << 14)
#define NFC_ECC_EN (1 << 0)
#define NFC_ECC_PIPELINE (1 << 3)
#define NFC_ECC_EXCEPTION (1 << 4)
#define NFC_ECC_BLOCK_SIZE (1 << 5)
#define NFC_ECC_RANDOM_EN (1 << 9)
#define NFC_ECC_RANDOM_DIRECTION (1 << 10)
#define NFC_ADDR_NUM_OFFSET 16
#define NFC_SEND_ADR (1 << 19)
#define NFC_ACCESS_DIR (1 << 20)
#define NFC_DATA_TRANS (1 << 21)
#define NFC_SEND_CMD1 (1 << 22)
#define NFC_WAIT_FLAG (1 << 23)
#define NFC_SEND_CMD2 (1 << 24)
#define NFC_SEQ (1 << 25)
#define NFC_DATA_SWAP_METHOD (1 << 26)
#define NFC_ROW_AUTO_INC (1 << 27)
#define NFC_SEND_CMD3 (1 << 28)
#define NFC_SEND_CMD4 (1 << 29)
#define NFC_CMD_INT_FLAG (1 << 1)
#define NFC_READ_CMD_OFFSET 0
#define NFC_RANDOM_READ_CMD0_OFFSET 8
#define NFC_RANDOM_READ_CMD1_OFFSET 16
#define NFC_CMD_RNDOUTSTART 0xE0
#define NFC_CMD_RNDOUT 0x05
#define NFC_CMD_READSTART 0x30
#define NFC_PAGE_CMD (2 << 30)
#define SUNXI_DMA_CFG_REG0 0x300
#define SUNXI_DMA_SRC_START_ADDR_REG0 0x304
#define SUNXI_DMA_DEST_START_ADDRR_REG0 0x308
#define SUNXI_DMA_DDMA_BC_REG0 0x30C
#define SUNXI_DMA_DDMA_PARA_REG0 0x318
#define SUNXI_DMA_DDMA_CFG_REG_LOADING (1 << 31)
#define SUNXI_DMA_DDMA_CFG_REG_DMA_DEST_DATA_WIDTH_32 (2 << 25)
#define SUNXI_DMA_DDMA_CFG_REG_DDMA_DST_DRQ_TYPE_DRAM (1 << 16)
#define SUNXI_DMA_DDMA_CFG_REG_DMA_SRC_DATA_WIDTH_32 (2 << 9)
#define SUNXI_DMA_DDMA_CFG_REG_DMA_SRC_ADDR_MODE_IO (1 << 5)
#define SUNXI_DMA_DDMA_CFG_REG_DDMA_SRC_DRQ_TYPE_NFC (3 << 0)
#define SUNXI_DMA_DDMA_PARA_REG_SRC_WAIT_CYC (0x0F << 0)
#define SUNXI_DMA_DDMA_PARA_REG_SRC_BLK_SIZE (0x7F << 8)
/* minimal "boot0" style NAND support for Allwinner A20 */
/* random seed used by linux */
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,
};
/* random seed used for syndrome calls */
const uint16_t random_seed_syndrome = 0x4a80;
#define MAX_RETRIES 10
static int check_value_inner(int offset, int expected_bits,
int max_number_of_retries, int negation)
{
int retries = 0;
do {
int val = readl(offset) & expected_bits;
if (negation ? !val : val)
return 1;
mdelay(1);
retries++;
} while (retries < max_number_of_retries);
return 0;
}
static inline int check_value(int offset, int expected_bits,
int max_number_of_retries)
{
return check_value_inner(offset, expected_bits,
max_number_of_retries, 0);
}
static inline int check_value_negated(int offset, int unexpected_bits,
int max_number_of_retries)
{
return check_value_inner(offset, unexpected_bits,
max_number_of_retries, 1);
}
void nand_init(void)
{
uint32_t val;
board_nand_init();
val = readl(SUNXI_NFC_BASE + NFC_CTL);
/* enable and reset CTL */
writel(val | NFC_CTL_EN | NFC_CTL_RESET,
SUNXI_NFC_BASE + NFC_CTL);
if (!check_value_negated(SUNXI_NFC_BASE + NFC_CTL,
NFC_CTL_RESET, MAX_RETRIES)) {
printf("Couldn't initialize nand\n");
}
/* reset NAND */
writel(NFC_SEND_CMD1 | NFC_WAIT_FLAG | NAND_CMD_RESET,
SUNXI_NFC_BASE + NFC_CMD);
if (!check_value(SUNXI_NFC_BASE + NFC_ST, NFC_CMD_INT_FLAG,
MAX_RETRIES)) {
printf("Error timeout waiting for nand reset\n");
return;
}
}
static void nand_read_page(unsigned int real_addr, dma_addr_t dst,
int syndrome, uint32_t *ecc_errors)
{
uint32_t val;
int ecc_off = 0;
uint16_t ecc_mode = 0;
uint16_t rand_seed;
uint32_t page;
uint16_t column;
uint32_t oob_offset;
switch (CONFIG_NAND_SUNXI_SPL_ECC_STRENGTH) {
case 16:
ecc_mode = 0;
ecc_off = 0x20;
break;
case 24:
ecc_mode = 1;
ecc_off = 0x2e;
break;
case 28:
ecc_mode = 2;
ecc_off = 0x32;
break;
case 32:
ecc_mode = 3;
ecc_off = 0x3c;
break;
case 40:
ecc_mode = 4;
ecc_off = 0x4a;
break;
case 48:
ecc_mode = 4;
ecc_off = 0x52;
break;
case 56:
ecc_mode = 4;
ecc_off = 0x60;
break;
case 60:
ecc_mode = 4;
ecc_off = 0x0;
break;
case 64:
ecc_mode = 4;
ecc_off = 0x0;
break;
default:
ecc_mode = 0;
ecc_off = 0;
}
if (ecc_off == 0) {
printf("Unsupported ECC strength (%d)!\n",
CONFIG_NAND_SUNXI_SPL_ECC_STRENGTH);
return;
}
page = real_addr / CONFIG_NAND_SUNXI_SPL_PAGE_SIZE;
column = real_addr % CONFIG_NAND_SUNXI_SPL_PAGE_SIZE;
if (syndrome)
column += (column / CONFIG_NAND_SUNXI_SPL_ECC_PAGE_SIZE)
* ecc_off;
/* clear ecc status */
writel(0, SUNXI_NFC_BASE + NFC_ECC_ST);
/* Choose correct seed */
if (syndrome)
rand_seed = random_seed_syndrome;
else
rand_seed = random_seed[page % 128];
writel((rand_seed << 16) | NFC_ECC_RANDOM_EN | NFC_ECC_EN
| NFC_ECC_PIPELINE | (ecc_mode << 12),
SUNXI_NFC_BASE + NFC_ECC_CTL);
val = readl(SUNXI_NFC_BASE + NFC_CTL);
writel(val | NFC_CTL_RAM_METHOD, SUNXI_NFC_BASE + NFC_CTL);
if (!syndrome) {
oob_offset = CONFIG_NAND_SUNXI_SPL_PAGE_SIZE
+ (column / CONFIG_NAND_SUNXI_SPL_ECC_PAGE_SIZE)
* ecc_off;
writel(oob_offset, SUNXI_NFC_BASE + NFC_SPARE_AREA);
}
/* SUNXI_DMA */
writel(0x0, SUNXI_DMA_BASE + SUNXI_DMA_CFG_REG0); /* clr dma cmd */
/* read from REG_IO_DATA */
writel(SUNXI_NFC_BASE + NFC_IO_DATA,
SUNXI_DMA_BASE + SUNXI_DMA_SRC_START_ADDR_REG0);
/* read to RAM */
writel(dst, SUNXI_DMA_BASE + SUNXI_DMA_DEST_START_ADDRR_REG0);
writel(SUNXI_DMA_DDMA_PARA_REG_SRC_WAIT_CYC
| SUNXI_DMA_DDMA_PARA_REG_SRC_BLK_SIZE,
SUNXI_DMA_BASE + SUNXI_DMA_DDMA_PARA_REG0);
writel(CONFIG_NAND_SUNXI_SPL_ECC_PAGE_SIZE,
SUNXI_DMA_BASE + SUNXI_DMA_DDMA_BC_REG0); /* 1kB */
writel(SUNXI_DMA_DDMA_CFG_REG_LOADING
| SUNXI_DMA_DDMA_CFG_REG_DMA_DEST_DATA_WIDTH_32
| SUNXI_DMA_DDMA_CFG_REG_DDMA_DST_DRQ_TYPE_DRAM
| SUNXI_DMA_DDMA_CFG_REG_DMA_SRC_DATA_WIDTH_32
| SUNXI_DMA_DDMA_CFG_REG_DMA_SRC_ADDR_MODE_IO
| SUNXI_DMA_DDMA_CFG_REG_DDMA_SRC_DRQ_TYPE_NFC,
SUNXI_DMA_BASE + SUNXI_DMA_CFG_REG0);
writel((NFC_CMD_RNDOUTSTART << NFC_RANDOM_READ_CMD1_OFFSET)
| (NFC_CMD_RNDOUT << NFC_RANDOM_READ_CMD0_OFFSET)
| (NFC_CMD_READSTART | NFC_READ_CMD_OFFSET), SUNXI_NFC_BASE
+ NFC_RCMD_SET);
writel(1, SUNXI_NFC_BASE + NFC_SECTOR_NUM);
writel(((page & 0xFFFF) << 16) | column,
SUNXI_NFC_BASE + NFC_ADDR_LOW);
writel((page >> 16) & 0xFF, SUNXI_NFC_BASE + NFC_ADDR_HIGH);
writel(NFC_SEND_CMD1 | NFC_SEND_CMD2 | NFC_DATA_TRANS |
NFC_PAGE_CMD | NFC_WAIT_FLAG | (4 << NFC_ADDR_NUM_OFFSET) |
NFC_SEND_ADR | NFC_DATA_SWAP_METHOD | (syndrome ? NFC_SEQ : 0),
SUNXI_NFC_BASE + NFC_CMD);
if (!check_value(SUNXI_NFC_BASE + NFC_ST, (1 << 2),
MAX_RETRIES)) {
printf("Error while initializing dma interrupt\n");
return;
}
if (!check_value_negated(SUNXI_DMA_BASE + SUNXI_DMA_CFG_REG0,
SUNXI_DMA_DDMA_CFG_REG_LOADING, MAX_RETRIES)) {
printf("Error while waiting for dma transfer to finish\n");
return;
}
if (readl(SUNXI_NFC_BASE + NFC_ECC_ST))
(*ecc_errors)++;
}
int nand_spl_load_image(uint32_t offs, unsigned int size, void *dest)
{
void *current_dest;
uint32_t ecc_errors = 0;
for (current_dest = dest;
current_dest < (dest + size);
current_dest += CONFIG_NAND_SUNXI_SPL_ECC_PAGE_SIZE) {
nand_read_page(offs, (dma_addr_t)current_dest,
offs < CONFIG_NAND_SUNXI_SPL_SYNDROME_PARTITIONS_END,
&ecc_errors);
offs += CONFIG_NAND_SUNXI_SPL_ECC_PAGE_SIZE;
}
return ecc_errors ? -1 : 0;
}
void nand_deselect(void)
{
struct sunxi_ccm_reg *const ccm =
(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
clrbits_le32(&ccm->ahb_gate0, (CLK_GATE_OPEN << AHB_GATE_OFFSET_NAND0));
#ifdef CONFIG_MACH_SUN9I
clrbits_le32(&ccm->ahb_gate1, (1 << AHB_GATE_OFFSET_DMA));
#else
clrbits_le32(&ccm->ahb_gate0, (1 << AHB_GATE_OFFSET_DMA));
#endif
clrbits_le32(&ccm->nand0_clk_cfg, CCM_NAND_CTRL_ENABLE | AHB_DIV_1);
}
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