diff options
Diffstat (limited to 'plat/socionext/uniphier/uniphier_emmc.c')
| -rw-r--r-- | plat/socionext/uniphier/uniphier_emmc.c | 308 |
1 files changed, 308 insertions, 0 deletions
diff --git a/plat/socionext/uniphier/uniphier_emmc.c b/plat/socionext/uniphier/uniphier_emmc.c new file mode 100644 index 0000000..b3d23cb --- /dev/null +++ b/plat/socionext/uniphier/uniphier_emmc.c @@ -0,0 +1,308 @@ +/* + * Copyright (c) 2017-2020, ARM Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <assert.h> +#include <stdint.h> + +#include <platform_def.h> + +#include <arch_helpers.h> +#include <drivers/io/io_block.h> +#include <lib/mmio.h> +#include <lib/utils_def.h> + +#include "uniphier.h" + +#define MMC_CMD_SWITCH 6 +#define MMC_CMD_SELECT_CARD 7 +#define MMC_CMD_SEND_CSD 9 +#define MMC_CMD_READ_MULTIPLE_BLOCK 18 + +#define EXT_CSD_PART_CONF 179 /* R/W */ + +#define MMC_RSP_PRESENT BIT(0) +#define MMC_RSP_136 BIT(1) /* 136 bit response */ +#define MMC_RSP_CRC BIT(2) /* expect valid crc */ +#define MMC_RSP_BUSY BIT(3) /* card may send busy */ +#define MMC_RSP_OPCODE BIT(4) /* response contains opcode */ + +#define MMC_RSP_NONE (0) +#define MMC_RSP_R1 (MMC_RSP_PRESENT | MMC_RSP_CRC | MMC_RSP_OPCODE) +#define MMC_RSP_R1b (MMC_RSP_PRESENT | MMC_RSP_CRC | MMC_RSP_OPCODE | \ + MMC_RSP_BUSY) +#define MMC_RSP_R2 (MMC_RSP_PRESENT | MMC_RSP_136 | MMC_RSP_CRC) +#define MMC_RSP_R3 (MMC_RSP_PRESENT) +#define MMC_RSP_R4 (MMC_RSP_PRESENT) +#define MMC_RSP_R5 (MMC_RSP_PRESENT | MMC_RSP_CRC | MMC_RSP_OPCODE) +#define MMC_RSP_R6 (MMC_RSP_PRESENT | MMC_RSP_CRC | MMC_RSP_OPCODE) +#define MMC_RSP_R7 (MMC_RSP_PRESENT | MMC_RSP_CRC | MMC_RSP_OPCODE) + +#define SDHCI_DMA_ADDRESS 0x00 +#define SDHCI_BLOCK_SIZE 0x04 +#define SDHCI_MAKE_BLKSZ(dma, blksz) ((((dma) & 0x7) << 12) | ((blksz) & 0xFFF)) +#define SDHCI_BLOCK_COUNT 0x06 +#define SDHCI_ARGUMENT 0x08 +#define SDHCI_TRANSFER_MODE 0x0C +#define SDHCI_TRNS_DMA BIT(0) +#define SDHCI_TRNS_BLK_CNT_EN BIT(1) +#define SDHCI_TRNS_ACMD12 BIT(2) +#define SDHCI_TRNS_READ BIT(4) +#define SDHCI_TRNS_MULTI BIT(5) +#define SDHCI_COMMAND 0x0E +#define SDHCI_CMD_RESP_MASK 0x03 +#define SDHCI_CMD_CRC 0x08 +#define SDHCI_CMD_INDEX 0x10 +#define SDHCI_CMD_DATA 0x20 +#define SDHCI_CMD_ABORTCMD 0xC0 +#define SDHCI_CMD_RESP_NONE 0x00 +#define SDHCI_CMD_RESP_LONG 0x01 +#define SDHCI_CMD_RESP_SHORT 0x02 +#define SDHCI_CMD_RESP_SHORT_BUSY 0x03 +#define SDHCI_MAKE_CMD(c, f) ((((c) & 0xff) << 8) | ((f) & 0xff)) +#define SDHCI_RESPONSE 0x10 +#define SDHCI_HOST_CONTROL 0x28 +#define SDHCI_CTRL_DMA_MASK 0x18 +#define SDHCI_CTRL_SDMA 0x00 +#define SDHCI_BLOCK_GAP_CONTROL 0x2A +#define SDHCI_SOFTWARE_RESET 0x2F +#define SDHCI_RESET_CMD 0x02 +#define SDHCI_RESET_DATA 0x04 +#define SDHCI_INT_STATUS 0x30 +#define SDHCI_INT_RESPONSE BIT(0) +#define SDHCI_INT_DATA_END BIT(1) +#define SDHCI_INT_DMA_END BIT(3) +#define SDHCI_INT_ERROR BIT(15) +#define SDHCI_SIGNAL_ENABLE 0x38 + +/* RCA assigned by Boot ROM */ +#define UNIPHIER_EMMC_RCA 0x1000 + +struct uniphier_mmc_cmd { + unsigned int cmdidx; + unsigned int resp_type; + unsigned int cmdarg; + unsigned int is_data; +}; + +struct uniphier_emmc_host { + uintptr_t base; + bool is_block_addressing; +}; + +static struct uniphier_emmc_host uniphier_emmc_host; + +static int uniphier_emmc_send_cmd(uintptr_t host_base, + struct uniphier_mmc_cmd *cmd) +{ + uint32_t mode = 0; + uint32_t end_bit; + uint32_t stat, flags, dma_addr; + + mmio_write_32(host_base + SDHCI_INT_STATUS, -1); + mmio_write_32(host_base + SDHCI_SIGNAL_ENABLE, 0); + mmio_write_32(host_base + SDHCI_ARGUMENT, cmd->cmdarg); + + if (cmd->is_data) + mode = SDHCI_TRNS_DMA | SDHCI_TRNS_BLK_CNT_EN | + SDHCI_TRNS_ACMD12 | SDHCI_TRNS_READ | + SDHCI_TRNS_MULTI; + + mmio_write_16(host_base + SDHCI_TRANSFER_MODE, mode); + + if (!(cmd->resp_type & MMC_RSP_PRESENT)) + flags = SDHCI_CMD_RESP_NONE; + else if (cmd->resp_type & MMC_RSP_136) + flags = SDHCI_CMD_RESP_LONG; + else if (cmd->resp_type & MMC_RSP_BUSY) + flags = SDHCI_CMD_RESP_SHORT_BUSY; + else + flags = SDHCI_CMD_RESP_SHORT; + + if (cmd->resp_type & MMC_RSP_CRC) + flags |= SDHCI_CMD_CRC; + if (cmd->resp_type & MMC_RSP_OPCODE) + flags |= SDHCI_CMD_INDEX; + if (cmd->is_data) + flags |= SDHCI_CMD_DATA; + + if (cmd->resp_type & MMC_RSP_BUSY || cmd->is_data) + end_bit = SDHCI_INT_DATA_END; + else + end_bit = SDHCI_INT_RESPONSE; + + mmio_write_16(host_base + SDHCI_COMMAND, + SDHCI_MAKE_CMD(cmd->cmdidx, flags)); + + do { + stat = mmio_read_32(host_base + SDHCI_INT_STATUS); + if (stat & SDHCI_INT_ERROR) + return -EIO; + + if (stat & SDHCI_INT_DMA_END) { + mmio_write_32(host_base + SDHCI_INT_STATUS, stat); + dma_addr = mmio_read_32(host_base + SDHCI_DMA_ADDRESS); + mmio_write_32(host_base + SDHCI_DMA_ADDRESS, dma_addr); + } + } while (!(stat & end_bit)); + + return 0; +} + +static int uniphier_emmc_switch_part(uintptr_t host_base, int part_num) +{ + struct uniphier_mmc_cmd cmd = {0}; + + cmd.cmdidx = MMC_CMD_SWITCH; + cmd.resp_type = MMC_RSP_R1b; + cmd.cmdarg = (EXT_CSD_PART_CONF << 16) | (part_num << 8) | (3 << 24); + + return uniphier_emmc_send_cmd(host_base, &cmd); +} + +static int uniphier_emmc_check_device_size(uintptr_t host_base, + bool *is_block_addressing) +{ + struct uniphier_mmc_cmd cmd = {0}; + uint32_t csd40, csd72; /* CSD[71:40], CSD[103:72] */ + int ret; + + cmd.cmdidx = MMC_CMD_SEND_CSD; + cmd.resp_type = MMC_RSP_R2; + cmd.cmdarg = UNIPHIER_EMMC_RCA << 16; + + ret = uniphier_emmc_send_cmd(host_base, &cmd); + if (ret) + return ret; + + csd40 = mmio_read_32(host_base + SDHCI_RESPONSE + 4); + csd72 = mmio_read_32(host_base + SDHCI_RESPONSE + 8); + + /* C_SIZE == 0xfff && C_SIZE_MULT == 0x7 ? */ + *is_block_addressing = !(~csd40 & 0xffc00380) && !(~csd72 & 0x3); + + return 0; +} + +static int uniphier_emmc_load_image(uintptr_t host_base, + uint32_t dev_addr, + unsigned long load_addr, + uint32_t block_cnt) +{ + struct uniphier_mmc_cmd cmd = {0}; + uint8_t tmp; + + assert((load_addr >> 32) == 0); + + mmio_write_32(host_base + SDHCI_DMA_ADDRESS, load_addr); + mmio_write_16(host_base + SDHCI_BLOCK_SIZE, SDHCI_MAKE_BLKSZ(7, 512)); + mmio_write_16(host_base + SDHCI_BLOCK_COUNT, block_cnt); + + tmp = mmio_read_8(host_base + SDHCI_HOST_CONTROL); + tmp &= ~SDHCI_CTRL_DMA_MASK; + tmp |= SDHCI_CTRL_SDMA; + mmio_write_8(host_base + SDHCI_HOST_CONTROL, tmp); + + tmp = mmio_read_8(host_base + SDHCI_BLOCK_GAP_CONTROL); + tmp &= ~1; /* clear Stop At Block Gap Request */ + mmio_write_8(host_base + SDHCI_BLOCK_GAP_CONTROL, tmp); + + cmd.cmdidx = MMC_CMD_READ_MULTIPLE_BLOCK; + cmd.resp_type = MMC_RSP_R1; + cmd.cmdarg = dev_addr; + cmd.is_data = 1; + + return uniphier_emmc_send_cmd(host_base, &cmd); +} + +static size_t uniphier_emmc_read(int lba, uintptr_t buf, size_t size) +{ + int ret; + + inv_dcache_range(buf, size); + + if (!uniphier_emmc_host.is_block_addressing) + lba *= 512; + + ret = uniphier_emmc_load_image(uniphier_emmc_host.base, + lba, buf, size / 512); + + inv_dcache_range(buf, size); + + return ret ? 0 : size; +} + +static struct io_block_dev_spec uniphier_emmc_dev_spec = { + .ops = { + .read = uniphier_emmc_read, + }, + .block_size = 512, +}; + +static int uniphier_emmc_hw_init(struct uniphier_emmc_host *host) +{ + struct uniphier_mmc_cmd cmd = {0}; + uintptr_t host_base = uniphier_emmc_host.base; + int ret; + + /* + * deselect card before SEND_CSD command. + * Do not check the return code. It fails, but it is OK. + */ + cmd.cmdidx = MMC_CMD_SELECT_CARD; + cmd.resp_type = MMC_RSP_R1; + + uniphier_emmc_send_cmd(host_base, &cmd); /* CMD7 (arg=0) */ + + /* reset CMD Line */ + mmio_write_8(host_base + SDHCI_SOFTWARE_RESET, + SDHCI_RESET_CMD | SDHCI_RESET_DATA); + while (mmio_read_8(host_base + SDHCI_SOFTWARE_RESET)) + ; + + ret = uniphier_emmc_check_device_size(host_base, + &uniphier_emmc_host.is_block_addressing); + if (ret) + return ret; + + cmd.cmdarg = UNIPHIER_EMMC_RCA << 16; + + /* select card again */ + ret = uniphier_emmc_send_cmd(host_base, &cmd); + if (ret) + return ret; + + /* switch to Boot Partition 1 */ + ret = uniphier_emmc_switch_part(host_base, 1); + if (ret) + return ret; + + return 0; +} + +static const uintptr_t uniphier_emmc_base[] = { + [UNIPHIER_SOC_LD11] = 0x5a000200, + [UNIPHIER_SOC_LD20] = 0x5a000200, + [UNIPHIER_SOC_PXS3] = 0x5a000200, +}; + +int uniphier_emmc_init(unsigned int soc, + struct io_block_dev_spec **block_dev_spec) +{ + int ret; + + assert(soc < ARRAY_SIZE(uniphier_emmc_base)); + uniphier_emmc_host.base = uniphier_emmc_base[soc]; + if (uniphier_emmc_host.base == 0UL) + return -ENOTSUP; + + ret = uniphier_emmc_hw_init(&uniphier_emmc_host); + if (ret) + return ret; + + *block_dev_spec = &uniphier_emmc_dev_spec; + + return 0; +} |