| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Lee Jones | 8480 | 94.43% | 40 | 72.73% |
| Angus Clark | 389 | 4.33% | 6 | 10.91% |
| Brian Norris | 65 | 0.72% | 4 | 7.27% |
| Arvind Yadav | 30 | 0.33% | 1 | 1.82% |
| Cyrille Pitchen | 14 | 0.16% | 2 | 3.64% |
| Antonio Cardace | 1 | 0.01% | 1 | 1.82% |
| Jingoo Han | 1 | 0.01% | 1 | 1.82% |
| Total | 8980 | 55 |
/* * st_spi_fsm.c - ST Fast Sequence Mode (FSM) Serial Flash Controller * * Author: Angus Clark <angus.clark@st.com> * * Copyright (C) 2010-2014 STMicroelectronics Limited * * JEDEC probe based on drivers/mtd/devices/m25p80.c * * This code is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/regmap.h> #include <linux/platform_device.h> #include <linux/mfd/syscon.h> #include <linux/mtd/mtd.h> #include <linux/mtd/partitions.h> #include <linux/mtd/spi-nor.h> #include <linux/sched.h> #include <linux/delay.h> #include <linux/io.h> #include <linux/of.h> #include <linux/clk.h> #include "serial_flash_cmds.h" /* * FSM SPI Controller Registers */ #define SPI_CLOCKDIV 0x0010 #define SPI_MODESELECT 0x0018 #define SPI_CONFIGDATA 0x0020 #define SPI_STA_MODE_CHANGE 0x0028 #define SPI_FAST_SEQ_TRANSFER_SIZE 0x0100 #define SPI_FAST_SEQ_ADD1 0x0104 #define SPI_FAST_SEQ_ADD2 0x0108 #define SPI_FAST_SEQ_ADD_CFG 0x010c #define SPI_FAST_SEQ_OPC1 0x0110 #define SPI_FAST_SEQ_OPC2 0x0114 #define SPI_FAST_SEQ_OPC3 0x0118 #define SPI_FAST_SEQ_OPC4 0x011c #define SPI_FAST_SEQ_OPC5 0x0120 #define SPI_MODE_BITS 0x0124 #define SPI_DUMMY_BITS 0x0128 #define SPI_FAST_SEQ_FLASH_STA_DATA 0x012c #define SPI_FAST_SEQ_1 0x0130 #define SPI_FAST_SEQ_2 0x0134 #define SPI_FAST_SEQ_3 0x0138 #define SPI_FAST_SEQ_4 0x013c #define SPI_FAST_SEQ_CFG 0x0140 #define SPI_FAST_SEQ_STA 0x0144 #define SPI_QUAD_BOOT_SEQ_INIT_1 0x0148 #define SPI_QUAD_BOOT_SEQ_INIT_2 0x014c #define SPI_QUAD_BOOT_READ_SEQ_1 0x0150 #define SPI_QUAD_BOOT_READ_SEQ_2 0x0154 #define SPI_PROGRAM_ERASE_TIME 0x0158 #define SPI_MULT_PAGE_REPEAT_SEQ_1 0x015c #define SPI_MULT_PAGE_REPEAT_SEQ_2 0x0160 #define SPI_STATUS_WR_TIME_REG 0x0164 #define SPI_FAST_SEQ_DATA_REG 0x0300 /* * Register: SPI_MODESELECT */ #define SPI_MODESELECT_CONTIG 0x01 #define SPI_MODESELECT_FASTREAD 0x02 #define SPI_MODESELECT_DUALIO 0x04 #define SPI_MODESELECT_FSM 0x08 #define SPI_MODESELECT_QUADBOOT 0x10 /* * Register: SPI_CONFIGDATA */ #define SPI_CFG_DEVICE_ST 0x1 #define SPI_CFG_DEVICE_ATMEL 0x4 #define SPI_CFG_MIN_CS_HIGH(x) (((x) & 0xfff) << 4) #define SPI_CFG_CS_SETUPHOLD(x) (((x) & 0xff) << 16) #define SPI_CFG_DATA_HOLD(x) (((x) & 0xff) << 24) #define SPI_CFG_DEFAULT_MIN_CS_HIGH SPI_CFG_MIN_CS_HIGH(0x0AA) #define SPI_CFG_DEFAULT_CS_SETUPHOLD SPI_CFG_CS_SETUPHOLD(0xA0) #define SPI_CFG_DEFAULT_DATA_HOLD SPI_CFG_DATA_HOLD(0x00) /* * Register: SPI_FAST_SEQ_TRANSFER_SIZE */ #define TRANSFER_SIZE(x) ((x) * 8) /* * Register: SPI_FAST_SEQ_ADD_CFG */ #define ADR_CFG_CYCLES_ADD1(x) ((x) << 0) #define ADR_CFG_PADS_1_ADD1 (0x0 << 6) #define ADR_CFG_PADS_2_ADD1 (0x1 << 6) #define ADR_CFG_PADS_4_ADD1 (0x3 << 6) #define ADR_CFG_CSDEASSERT_ADD1 (1 << 8) #define ADR_CFG_CYCLES_ADD2(x) ((x) << (0+16)) #define ADR_CFG_PADS_1_ADD2 (0x0 << (6+16)) #define ADR_CFG_PADS_2_ADD2 (0x1 << (6+16)) #define ADR_CFG_PADS_4_ADD2 (0x3 << (6+16)) #define ADR_CFG_CSDEASSERT_ADD2 (1 << (8+16)) /* * Register: SPI_FAST_SEQ_n */ #define SEQ_OPC_OPCODE(x) ((x) << 0) #define SEQ_OPC_CYCLES(x) ((x) << 8) #define SEQ_OPC_PADS_1 (0x0 << 14) #define SEQ_OPC_PADS_2 (0x1 << 14) #define SEQ_OPC_PADS_4 (0x3 << 14) #define SEQ_OPC_CSDEASSERT (1 << 16) /* * Register: SPI_FAST_SEQ_CFG */ #define SEQ_CFG_STARTSEQ (1 << 0) #define SEQ_CFG_SWRESET (1 << 5) #define SEQ_CFG_CSDEASSERT (1 << 6) #define SEQ_CFG_READNOTWRITE (1 << 7) #define SEQ_CFG_ERASE (1 << 8) #define SEQ_CFG_PADS_1 (0x0 << 16) #define SEQ_CFG_PADS_2 (0x1 << 16) #define SEQ_CFG_PADS_4 (0x3 << 16) /* * Register: SPI_MODE_BITS */ #define MODE_DATA(x) (x & 0xff) #define MODE_CYCLES(x) ((x & 0x3f) << 16) #define MODE_PADS_1 (0x0 << 22) #define MODE_PADS_2 (0x1 << 22) #define MODE_PADS_4 (0x3 << 22) #define DUMMY_CSDEASSERT (1 << 24) /* * Register: SPI_DUMMY_BITS */ #define DUMMY_CYCLES(x) ((x & 0x3f) << 16) #define DUMMY_PADS_1 (0x0 << 22) #define DUMMY_PADS_2 (0x1 << 22) #define DUMMY_PADS_4 (0x3 << 22) #define DUMMY_CSDEASSERT (1 << 24) /* * Register: SPI_FAST_SEQ_FLASH_STA_DATA */ #define STA_DATA_BYTE1(x) ((x & 0xff) << 0) #define STA_DATA_BYTE2(x) ((x & 0xff) << 8) #define STA_PADS_1 (0x0 << 16) #define STA_PADS_2 (0x1 << 16) #define STA_PADS_4 (0x3 << 16) #define STA_CSDEASSERT (0x1 << 20) #define STA_RDNOTWR (0x1 << 21) /* * FSM SPI Instruction Opcodes */ #define STFSM_OPC_CMD 0x1 #define STFSM_OPC_ADD 0x2 #define STFSM_OPC_STA 0x3 #define STFSM_OPC_MODE 0x4 #define STFSM_OPC_DUMMY 0x5 #define STFSM_OPC_DATA 0x6 #define STFSM_OPC_WAIT 0x7 #define STFSM_OPC_JUMP 0x8 #define STFSM_OPC_GOTO 0x9 #define STFSM_OPC_STOP 0xF /* * FSM SPI Instructions (== opcode + operand). */ #define STFSM_INSTR(cmd, op) ((cmd) | ((op) << 4)) #define STFSM_INST_CMD1 STFSM_INSTR(STFSM_OPC_CMD, 1) #define STFSM_INST_CMD2 STFSM_INSTR(STFSM_OPC_CMD, 2) #define STFSM_INST_CMD3 STFSM_INSTR(STFSM_OPC_CMD, 3) #define STFSM_INST_CMD4 STFSM_INSTR(STFSM_OPC_CMD, 4) #define STFSM_INST_CMD5 STFSM_INSTR(STFSM_OPC_CMD, 5) #define STFSM_INST_ADD1 STFSM_INSTR(STFSM_OPC_ADD, 1) #define STFSM_INST_ADD2 STFSM_INSTR(STFSM_OPC_ADD, 2) #define STFSM_INST_DATA_WRITE STFSM_INSTR(STFSM_OPC_DATA, 1) #define STFSM_INST_DATA_READ STFSM_INSTR(STFSM_OPC_DATA, 2) #define STFSM_INST_STA_RD1 STFSM_INSTR(STFSM_OPC_STA, 0x1) #define STFSM_INST_STA_WR1 STFSM_INSTR(STFSM_OPC_STA, 0x1) #define STFSM_INST_STA_RD2 STFSM_INSTR(STFSM_OPC_STA, 0x2) #define STFSM_INST_STA_WR1_2 STFSM_INSTR(STFSM_OPC_STA, 0x3) #define STFSM_INST_MODE STFSM_INSTR(STFSM_OPC_MODE, 0) #define STFSM_INST_DUMMY STFSM_INSTR(STFSM_OPC_DUMMY, 0) #define STFSM_INST_WAIT STFSM_INSTR(STFSM_OPC_WAIT, 0) #define STFSM_INST_STOP STFSM_INSTR(STFSM_OPC_STOP, 0) #define STFSM_DEFAULT_EMI_FREQ 100000000UL /* 100 MHz */ #define STFSM_DEFAULT_WR_TIME (STFSM_DEFAULT_EMI_FREQ * (15/1000)) /* 15ms */ #define STFSM_FLASH_SAFE_FREQ 10000000UL /* 10 MHz */ #define STFSM_MAX_WAIT_SEQ_MS 1000 /* FSM execution time */ /* S25FLxxxS commands */ #define S25FL_CMD_WRITE4_1_1_4 0x34 #define S25FL_CMD_SE4 0xdc #define S25FL_CMD_CLSR 0x30 #define S25FL_CMD_DYBWR 0xe1 #define S25FL_CMD_DYBRD 0xe0 #define S25FL_CMD_WRITE4 0x12 /* Note, opcode clashes with * 'SPINOR_OP_WRITE_1_4_4' * as found on N25Qxxx devices! */ /* Status register */ #define FLASH_STATUS_BUSY 0x01 #define FLASH_STATUS_WEL 0x02 #define FLASH_STATUS_BP0 0x04 #define FLASH_STATUS_BP1 0x08 #define FLASH_STATUS_BP2 0x10 #define FLASH_STATUS_SRWP0 0x80 #define FLASH_STATUS_TIMEOUT 0xff /* S25FL Error Flags */ #define S25FL_STATUS_E_ERR 0x20 #define S25FL_STATUS_P_ERR 0x40 #define N25Q_CMD_WRVCR 0x81 #define N25Q_CMD_RDVCR 0x85 #define N25Q_CMD_RDVECR 0x65 #define N25Q_CMD_RDNVCR 0xb5 #define N25Q_CMD_WRNVCR 0xb1 #define FLASH_PAGESIZE 256 /* In Bytes */ #define FLASH_PAGESIZE_32 (FLASH_PAGESIZE / 4) /* In uint32_t */ #define FLASH_MAX_BUSY_WAIT (300 * HZ) /* Maximum 'CHIPERASE' time */ /* * Flags to tweak operation of default read/write/erase routines */ #define CFG_READ_TOGGLE_32BIT_ADDR 0x00000001 #define CFG_WRITE_TOGGLE_32BIT_ADDR 0x00000002 #define CFG_ERASESEC_TOGGLE_32BIT_ADDR 0x00000008 #define CFG_S25FL_CHECK_ERROR_FLAGS 0x00000010 struct stfsm_seq { uint32_t data_size; uint32_t addr1; uint32_t addr2; uint32_t addr_cfg; uint32_t seq_opc[5]; uint32_t mode; uint32_t dummy; uint32_t status; uint8_t seq[16]; uint32_t seq_cfg; } __packed __aligned(4); struct stfsm { struct device *dev; void __iomem *base; struct resource *region; struct mtd_info mtd; struct mutex lock; struct flash_info *info; struct clk *clk; uint32_t configuration; uint32_t fifo_dir_delay; bool booted_from_spi; bool reset_signal; bool reset_por; struct stfsm_seq stfsm_seq_read; struct stfsm_seq stfsm_seq_write; struct stfsm_seq stfsm_seq_en_32bit_addr; }; /* Parameters to configure a READ or WRITE FSM sequence */ struct seq_rw_config { uint32_t flags; /* flags to support config */ uint8_t cmd; /* FLASH command */ int write; /* Write Sequence */ uint8_t addr_pads; /* No. of addr pads (MODE & DUMMY) */ uint8_t data_pads; /* No. of data pads */ uint8_t mode_data; /* MODE data */ uint8_t mode_cycles; /* No. of MODE cycles */ uint8_t dummy_cycles; /* No. of DUMMY cycles */ }; /* SPI Flash Device Table */ struct flash_info { char *name; /* * JEDEC id zero means "no ID" (most older chips); otherwise it has * a high byte of zero plus three data bytes: the manufacturer id, * then a two byte device id. */ u32 jedec_id; u16 ext_id; /* * The size listed here is what works with SPINOR_OP_SE, which isn't * necessarily called a "sector" by the vendor. */ unsigned sector_size; u16 n_sectors; u32 flags; /* * Note, where FAST_READ is supported, freq_max specifies the * FAST_READ frequency, not the READ frequency. */ u32 max_freq; int (*config)(struct stfsm *); }; static int stfsm_n25q_config(struct stfsm *fsm); static int stfsm_mx25_config(struct stfsm *fsm); static int stfsm_s25fl_config(struct stfsm *fsm); static int stfsm_w25q_config(struct stfsm *fsm); static struct flash_info flash_types[] = { /* * ST Microelectronics/Numonyx -- * (newer production versions may have feature updates * (eg faster operating frequency) */ #define M25P_FLAG (FLASH_FLAG_READ_WRITE | FLASH_FLAG_READ_FAST) { "m25p40", 0x202013, 0, 64 * 1024, 8, M25P_FLAG, 25, NULL }, { "m25p80", 0x202014, 0, 64 * 1024, 16, M25P_FLAG, 25, NULL }, { "m25p16", 0x202015, 0, 64 * 1024, 32, M25P_FLAG, 25, NULL }, { "m25p32", 0x202016, 0, 64 * 1024, 64, M25P_FLAG, 50, NULL }, { "m25p64", 0x202017, 0, 64 * 1024, 128, M25P_FLAG, 50, NULL }, { "m25p128", 0x202018, 0, 256 * 1024, 64, M25P_FLAG, 50, NULL }, #define M25PX_FLAG (FLASH_FLAG_READ_WRITE | \ FLASH_FLAG_READ_FAST | \ FLASH_FLAG_READ_1_1_2 | \ FLASH_FLAG_WRITE_1_1_2) { "m25px32", 0x207116, 0, 64 * 1024, 64, M25PX_FLAG, 75, NULL }, { "m25px64", 0x207117, 0, 64 * 1024, 128, M25PX_FLAG, 75, NULL }, /* Macronix MX25xxx * - Support for 'FLASH_FLAG_WRITE_1_4_4' is omitted for devices * where operating frequency must be reduced. */ #define MX25_FLAG (FLASH_FLAG_READ_WRITE | \ FLASH_FLAG_READ_FAST | \ FLASH_FLAG_READ_1_1_2 | \ FLASH_FLAG_READ_1_2_2 | \ FLASH_FLAG_READ_1_1_4 | \ FLASH_FLAG_SE_4K | \ FLASH_FLAG_SE_32K) { "mx25l3255e", 0xc29e16, 0, 64 * 1024, 64, (MX25_FLAG | FLASH_FLAG_WRITE_1_4_4), 86, stfsm_mx25_config}, { "mx25l25635e", 0xc22019, 0, 64*1024, 512, (MX25_FLAG | FLASH_FLAG_32BIT_ADDR | FLASH_FLAG_RESET), 70, stfsm_mx25_config }, { "mx25l25655e", 0xc22619, 0, 64*1024, 512, (MX25_FLAG | FLASH_FLAG_32BIT_ADDR | FLASH_FLAG_RESET), 70, stfsm_mx25_config}, #define N25Q_FLAG (FLASH_FLAG_READ_WRITE | \ FLASH_FLAG_READ_FAST | \ FLASH_FLAG_READ_1_1_2 | \ FLASH_FLAG_READ_1_2_2 | \ FLASH_FLAG_READ_1_1_4 | \ FLASH_FLAG_READ_1_4_4 | \ FLASH_FLAG_WRITE_1_1_2 | \ FLASH_FLAG_WRITE_1_2_2 | \ FLASH_FLAG_WRITE_1_1_4 | \ FLASH_FLAG_WRITE_1_4_4) { "n25q128", 0x20ba18, 0, 64 * 1024, 256, N25Q_FLAG, 108, stfsm_n25q_config }, { "n25q256", 0x20ba19, 0, 64 * 1024, 512, N25Q_FLAG | FLASH_FLAG_32BIT_ADDR, 108, stfsm_n25q_config }, /* * Spansion S25FLxxxP * - 256KiB and 64KiB sector variants (identified by ext. JEDEC) */ #define S25FLXXXP_FLAG (FLASH_FLAG_READ_WRITE | \ FLASH_FLAG_READ_1_1_2 | \ FLASH_FLAG_READ_1_2_2 | \ FLASH_FLAG_READ_1_1_4 | \ FLASH_FLAG_READ_1_4_4 | \ FLASH_FLAG_WRITE_1_1_4 | \ FLASH_FLAG_READ_FAST) { "s25fl032p", 0x010215, 0x4d00, 64 * 1024, 64, S25FLXXXP_FLAG, 80, stfsm_s25fl_config}, { "s25fl129p0", 0x012018, 0x4d00, 256 * 1024, 64, S25FLXXXP_FLAG, 80, stfsm_s25fl_config }, { "s25fl129p1", 0x012018, 0x4d01, 64 * 1024, 256, S25FLXXXP_FLAG, 80, stfsm_s25fl_config }, /* * Spansion S25FLxxxS * - 256KiB and 64KiB sector variants (identified by ext. JEDEC) * - RESET# signal supported by die but not bristled out on all * package types. The package type is a function of board design, * so this information is captured in the board's flags. * - Supports 'DYB' sector protection. Depending on variant, sectors * may default to locked state on power-on. */ #define S25FLXXXS_FLAG (S25FLXXXP_FLAG | \ FLASH_FLAG_RESET | \ FLASH_FLAG_DYB_LOCKING) { "s25fl128s0", 0x012018, 0x0300, 256 * 1024, 64, S25FLXXXS_FLAG, 80, stfsm_s25fl_config }, { "s25fl128s1", 0x012018, 0x0301, 64 * 1024, 256, S25FLXXXS_FLAG, 80, stfsm_s25fl_config }, { "s25fl256s0", 0x010219, 0x4d00, 256 * 1024, 128, S25FLXXXS_FLAG | FLASH_FLAG_32BIT_ADDR, 80, stfsm_s25fl_config }, { "s25fl256s1", 0x010219, 0x4d01, 64 * 1024, 512, S25FLXXXS_FLAG | FLASH_FLAG_32BIT_ADDR, 80, stfsm_s25fl_config }, /* Winbond -- w25x "blocks" are 64K, "sectors" are 4KiB */ #define W25X_FLAG (FLASH_FLAG_READ_WRITE | \ FLASH_FLAG_READ_FAST | \ FLASH_FLAG_READ_1_1_2 | \ FLASH_FLAG_WRITE_1_1_2) { "w25x40", 0xef3013, 0, 64 * 1024, 8, W25X_FLAG, 75, NULL }, { "w25x80", 0xef3014, 0, 64 * 1024, 16, W25X_FLAG, 75, NULL }, { "w25x16", 0xef3015, 0, 64 * 1024, 32, W25X_FLAG, 75, NULL }, { "w25x32", 0xef3016, 0, 64 * 1024, 64, W25X_FLAG, 75, NULL }, { "w25x64", 0xef3017, 0, 64 * 1024, 128, W25X_FLAG, 75, NULL }, /* Winbond -- w25q "blocks" are 64K, "sectors" are 4KiB */ #define W25Q_FLAG (FLASH_FLAG_READ_WRITE | \ FLASH_FLAG_READ_FAST | \ FLASH_FLAG_READ_1_1_2 | \ FLASH_FLAG_READ_1_2_2 | \ FLASH_FLAG_READ_1_1_4 | \ FLASH_FLAG_READ_1_4_4 | \ FLASH_FLAG_WRITE_1_1_4) { "w25q80", 0xef4014, 0, 64 * 1024, 16, W25Q_FLAG, 80, stfsm_w25q_config }, { "w25q16", 0xef4015, 0, 64 * 1024, 32, W25Q_FLAG, 80, stfsm_w25q_config }, { "w25q32", 0xef4016, 0, 64 * 1024, 64, W25Q_FLAG, 80, stfsm_w25q_config }, { "w25q64", 0xef4017, 0, 64 * 1024, 128, W25Q_FLAG, 80, stfsm_w25q_config }, /* Sentinel */ { NULL, 0x000000, 0, 0, 0, 0, 0, NULL }, }; /* * FSM message sequence configurations: * * All configs are presented in order of preference */ /* Default READ configurations, in order of preference */ static struct seq_rw_config default_read_configs[] = { {FLASH_FLAG_READ_1_4_4, SPINOR_OP_READ_1_4_4, 0, 4, 4, 0x00, 2, 4}, {FLASH_FLAG_READ_1_1_4, SPINOR_OP_READ_1_1_4, 0, 1, 4, 0x00, 4, 0}, {FLASH_FLAG_READ_1_2_2, SPINOR_OP_READ_1_2_2, 0, 2, 2, 0x00, 4, 0}, {FLASH_FLAG_READ_1_1_2, SPINOR_OP_READ_1_1_2, 0, 1, 2, 0x00, 0, 8}, {FLASH_FLAG_READ_FAST, SPINOR_OP_READ_FAST, 0, 1, 1, 0x00, 0, 8}, {FLASH_FLAG_READ_WRITE, SPINOR_OP_READ, 0, 1, 1, 0x00, 0, 0}, {0x00, 0, 0, 0, 0, 0x00, 0, 0}, }; /* Default WRITE configurations */ static struct seq_rw_config default_write_configs[] = { {FLASH_FLAG_WRITE_1_4_4, SPINOR_OP_WRITE_1_4_4, 1, 4, 4, 0x00, 0, 0}, {FLASH_FLAG_WRITE_1_1_4, SPINOR_OP_WRITE_1_1_4, 1, 1, 4, 0x00, 0, 0}, {FLASH_FLAG_WRITE_1_2_2, SPINOR_OP_WRITE_1_2_2, 1, 2, 2, 0x00, 0, 0}, {FLASH_FLAG_WRITE_1_1_2, SPINOR_OP_WRITE_1_1_2, 1, 1, 2, 0x00, 0, 0}, {FLASH_FLAG_READ_WRITE, SPINOR_OP_WRITE, 1, 1, 1, 0x00, 0, 0}, {0x00, 0, 0, 0, 0, 0x00, 0, 0}, }; /* * [N25Qxxx] Configuration */ #define N25Q_VCR_DUMMY_CYCLES(x) (((x) & 0xf) << 4) #define N25Q_VCR_XIP_DISABLED ((uint8_t)0x1 << 3) #define N25Q_VCR_WRAP_CONT 0x3 /* N25Q 3-byte Address READ configurations * - 'FAST' variants configured for 8 dummy cycles. * * Note, the number of dummy cycles used for 'FAST' READ operations is * configurable and would normally be tuned according to the READ command and * operating frequency. However, this applies universally to all 'FAST' READ * commands, including those used by the SPIBoot controller, and remains in * force until the device is power-cycled. Since the SPIBoot controller is * hard-wired to use 8 dummy cycles, we must configure the device to also use 8 * cycles. */ static struct seq_rw_config n25q_read3_configs[] = { {FLASH_FLAG_READ_1_4_4, SPINOR_OP_READ_1_4_4, 0, 4, 4, 0x00, 0, 8}, {FLASH_FLAG_READ_1_1_4, SPINOR_OP_READ_1_1_4, 0, 1, 4, 0x00, 0, 8}, {FLASH_FLAG_READ_1_2_2, SPINOR_OP_READ_1_2_2, 0, 2, 2, 0x00, 0, 8}, {FLASH_FLAG_READ_1_1_2, SPINOR_OP_READ_1_1_2, 0, 1, 2, 0x00, 0, 8}, {FLASH_FLAG_READ_FAST, SPINOR_OP_READ_FAST, 0, 1, 1, 0x00, 0, 8}, {FLASH_FLAG_READ_WRITE, SPINOR_OP_READ, 0, 1, 1, 0x00, 0, 0}, {0x00, 0, 0, 0, 0, 0x00, 0, 0}, }; /* N25Q 4-byte Address READ configurations * - use special 4-byte address READ commands (reduces overheads, and * reduces risk of hitting watchdog reset issues). * - 'FAST' variants configured for 8 dummy cycles (see note above.) */ static struct seq_rw_config n25q_read4_configs[] = { {FLASH_FLAG_READ_1_4_4, SPINOR_OP_READ_1_4_4_4B, 0, 4, 4, 0x00, 0, 8}, {FLASH_FLAG_READ_1_1_4, SPINOR_OP_READ_1_1_4_4B, 0, 1, 4, 0x00, 0, 8}, {FLASH_FLAG_READ_1_2_2, SPINOR_OP_READ_1_2_2_4B, 0, 2, 2, 0x00, 0, 8}, {FLASH_FLAG_READ_1_1_2, SPINOR_OP_READ_1_1_2_4B, 0, 1, 2, 0x00, 0, 8}, {FLASH_FLAG_READ_FAST, SPINOR_OP_READ_FAST_4B, 0, 1, 1, 0x00, 0, 8}, {FLASH_FLAG_READ_WRITE, SPINOR_OP_READ_4B, 0, 1, 1, 0x00, 0, 0}, {0x00, 0, 0, 0, 0, 0x00, 0, 0}, }; /* * [MX25xxx] Configuration */ #define MX25_STATUS_QE (0x1 << 6) static int stfsm_mx25_en_32bit_addr_seq(struct stfsm_seq *seq) { seq->seq_opc[0] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | SEQ_OPC_OPCODE(SPINOR_OP_EN4B) | SEQ_OPC_CSDEASSERT); seq->seq[0] = STFSM_INST_CMD1; seq->seq[1] = STFSM_INST_WAIT; seq->seq[2] = STFSM_INST_STOP; seq->seq_cfg = (SEQ_CFG_PADS_1 | SEQ_CFG_ERASE | SEQ_CFG_READNOTWRITE | SEQ_CFG_CSDEASSERT | SEQ_CFG_STARTSEQ); return 0; } /* * [S25FLxxx] Configuration */ #define STFSM_S25FL_CONFIG_QE (0x1 << 1) /* * S25FLxxxS devices provide three ways of supporting 32-bit addressing: Bank * Register, Extended Address Modes, and a 32-bit address command set. The * 32-bit address command set is used here, since it avoids any problems with * entering a state that is incompatible with the SPIBoot Controller. */ static struct seq_rw_config stfsm_s25fl_read4_configs[] = { {FLASH_FLAG_READ_1_4_4, SPINOR_OP_READ_1_4_4_4B, 0, 4, 4, 0x00, 2, 4}, {FLASH_FLAG_READ_1_1_4, SPINOR_OP_READ_1_1_4_4B, 0, 1, 4, 0x00, 0, 8}, {FLASH_FLAG_READ_1_2_2, SPINOR_OP_READ_1_2_2_4B, 0, 2, 2, 0x00, 4, 0}, {FLASH_FLAG_READ_1_1_2, SPINOR_OP_READ_1_1_2_4B, 0, 1, 2, 0x00, 0, 8}, {FLASH_FLAG_READ_FAST, SPINOR_OP_READ_FAST_4B, 0, 1, 1, 0x00, 0, 8}, {FLASH_FLAG_READ_WRITE, SPINOR_OP_READ_4B, 0, 1, 1, 0x00, 0, 0}, {0x00, 0, 0, 0, 0, 0x00, 0, 0}, }; static struct seq_rw_config stfsm_s25fl_write4_configs[] = { {FLASH_FLAG_WRITE_1_1_4, S25FL_CMD_WRITE4_1_1_4, 1, 1, 4, 0x00, 0, 0}, {FLASH_FLAG_READ_WRITE, S25FL_CMD_WRITE4, 1, 1, 1, 0x00, 0, 0}, {0x00, 0, 0, 0, 0, 0x00, 0, 0}, }; /* * [W25Qxxx] Configuration */ #define W25Q_STATUS_QE (0x1 << 1) static struct stfsm_seq stfsm_seq_read_jedec = { .data_size = TRANSFER_SIZE(8), .seq_opc[0] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | SEQ_OPC_OPCODE(SPINOR_OP_RDID)), .seq = { STFSM_INST_CMD1, STFSM_INST_DATA_READ, STFSM_INST_STOP, }, .seq_cfg = (SEQ_CFG_PADS_1 | SEQ_CFG_READNOTWRITE | SEQ_CFG_CSDEASSERT | SEQ_CFG_STARTSEQ), }; static struct stfsm_seq stfsm_seq_read_status_fifo = { .data_size = TRANSFER_SIZE(4), .seq_opc[0] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | SEQ_OPC_OPCODE(SPINOR_OP_RDSR)), .seq = { STFSM_INST_CMD1, STFSM_INST_DATA_READ, STFSM_INST_STOP, }, .seq_cfg = (SEQ_CFG_PADS_1 | SEQ_CFG_READNOTWRITE | SEQ_CFG_CSDEASSERT | SEQ_CFG_STARTSEQ), }; static struct stfsm_seq stfsm_seq_erase_sector = { /* 'addr_cfg' configured during initialisation */ .seq_opc = { (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | SEQ_OPC_OPCODE(SPINOR_OP_WREN) | SEQ_OPC_CSDEASSERT), (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | SEQ_OPC_OPCODE(SPINOR_OP_SE)), }, .seq = { STFSM_INST_CMD1, STFSM_INST_CMD2, STFSM_INST_ADD1, STFSM_INST_ADD2, STFSM_INST_STOP, }, .seq_cfg = (SEQ_CFG_PADS_1 | SEQ_CFG_READNOTWRITE | SEQ_CFG_CSDEASSERT | SEQ_CFG_STARTSEQ), }; static struct stfsm_seq stfsm_seq_erase_chip = { .seq_opc = { (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | SEQ_OPC_OPCODE(SPINOR_OP_WREN) | SEQ_OPC_CSDEASSERT), (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | SEQ_OPC_OPCODE(SPINOR_OP_CHIP_ERASE) | SEQ_OPC_CSDEASSERT), }, .seq = { STFSM_INST_CMD1, STFSM_INST_CMD2, STFSM_INST_WAIT, STFSM_INST_STOP, }, .seq_cfg = (SEQ_CFG_PADS_1 | SEQ_CFG_ERASE | SEQ_CFG_READNOTWRITE | SEQ_CFG_CSDEASSERT | SEQ_CFG_STARTSEQ), }; static struct stfsm_seq stfsm_seq_write_status = { .seq_opc[0] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | SEQ_OPC_OPCODE(SPINOR_OP_WREN) | SEQ_OPC_CSDEASSERT), .seq_opc[1] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | SEQ_OPC_OPCODE(SPINOR_OP_WRSR)), .seq = { STFSM_INST_CMD1, STFSM_INST_CMD2, STFSM_INST_STA_WR1, STFSM_INST_STOP, }, .seq_cfg = (SEQ_CFG_PADS_1 | SEQ_CFG_READNOTWRITE | SEQ_CFG_CSDEASSERT | SEQ_CFG_STARTSEQ), }; /* Dummy sequence to read one byte of data from flash into the FIFO */ static const struct stfsm_seq stfsm_seq_load_fifo_byte = { .data_size = TRANSFER_SIZE(1), .seq_opc[0] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | SEQ_OPC_OPCODE(SPINOR_OP_RDID)), .seq = { STFSM_INST_CMD1, STFSM_INST_DATA_READ, STFSM_INST_STOP, }, .seq_cfg = (SEQ_CFG_PADS_1 | SEQ_CFG_READNOTWRITE | SEQ_CFG_CSDEASSERT | SEQ_CFG_STARTSEQ), }; static int stfsm_n25q_en_32bit_addr_seq(struct stfsm_seq *seq) { seq->seq_opc[0] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | SEQ_OPC_OPCODE(SPINOR_OP_EN4B)); seq->seq_opc[1] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | SEQ_OPC_OPCODE(SPINOR_OP_WREN) | SEQ_OPC_CSDEASSERT); seq->seq[0] = STFSM_INST_CMD2; seq->seq[1] = STFSM_INST_CMD1; seq->seq[2] = STFSM_INST_WAIT; seq->seq[3] = STFSM_INST_STOP; seq->seq_cfg = (SEQ_CFG_PADS_1 | SEQ_CFG_ERASE | SEQ_CFG_READNOTWRITE | SEQ_CFG_CSDEASSERT | SEQ_CFG_STARTSEQ); return 0; } static inline int stfsm_is_idle(struct stfsm *fsm) { return readl(fsm->base + SPI_FAST_SEQ_STA) & 0x10; } static inline uint32_t stfsm_fifo_available(struct stfsm *fsm) { return (readl(fsm->base + SPI_FAST_SEQ_STA) >> 5) & 0x7f; } static inline void stfsm_load_seq(struct stfsm *fsm, const struct stfsm_seq *seq) { void __iomem *dst = fsm->base + SPI_FAST_SEQ_TRANSFER_SIZE; const uint32_t *src = (const uint32_t *)seq; int words = sizeof(*seq) / sizeof(*src); BUG_ON(!stfsm_is_idle(fsm)); while (words--) { writel(*src, dst); src++; dst += 4; } } static void stfsm_wait_seq(struct stfsm *fsm) { unsigned long deadline; int timeout = 0; deadline = jiffies + msecs_to_jiffies(STFSM_MAX_WAIT_SEQ_MS); while (!timeout) { if (time_after_eq(jiffies, deadline)) timeout = 1; if (stfsm_is_idle(fsm)) return; cond_resched(); } dev_err(fsm->dev, "timeout on sequence completion\n"); } static void stfsm_read_fifo(struct stfsm *fsm, uint32_t *buf, uint32_t size) { uint32_t remaining = size >> 2; uint32_t avail; uint32_t words; dev_dbg(fsm->dev, "Reading %d bytes from FIFO\n", size); BUG_ON((((uintptr_t)buf) & 0x3) || (size & 0x3)); while (remaining) { for (;;) { avail = stfsm_fifo_available(fsm); if (avail) break; udelay(1); } words = min(avail, remaining); remaining -= words; readsl(fsm->base + SPI_FAST_SEQ_DATA_REG, buf, words); buf += words; } } /* * Clear the data FIFO * * Typically, this is only required during driver initialisation, where no * assumptions can be made regarding the state of the FIFO. * * The process of clearing the FIFO is complicated by fact that while it is * possible for the FIFO to contain an arbitrary number of bytes [1], the * SPI_FAST_SEQ_STA register only reports the number of complete 32-bit words * present. Furthermore, data can only be drained from the FIFO by reading * complete 32-bit words. * * With this in mind, a two stage process is used to the clear the FIFO: * * 1. Read any complete 32-bit words from the FIFO, as reported by the * SPI_FAST_SEQ_STA register. * * 2. Mop up any remaining bytes. At this point, it is not known if there * are 0, 1, 2, or 3 bytes in the FIFO. To handle all cases, a dummy FSM * sequence is used to load one byte at a time, until a complete 32-bit * word is formed; at most, 4 bytes will need to be loaded. * * [1] It is theoretically possible for the FIFO to contain an arbitrary number * of bits. However, since there are no known use-cases that leave * incomplete bytes in the FIFO, only words and bytes are considered here. */ static void stfsm_clear_fifo(struct stfsm *fsm) { const struct stfsm_seq *seq = &stfsm_seq_load_fifo_byte; uint32_t words, i; /* 1. Clear any 32-bit words */ words = stfsm_fifo_available(fsm); if (words) { for (i = 0; i < words; i++) readl(fsm->base + SPI_FAST_SEQ_DATA_REG); dev_dbg(fsm->dev, "cleared %d words from FIFO\n", words); } /* * 2. Clear any remaining bytes * - Load the FIFO, one byte at a time, until a complete 32-bit word * is available. */ for (i = 0, words = 0; i < 4 && !words; i++) { stfsm_load_seq(fsm, seq); stfsm_wait_seq(fsm); words = stfsm_fifo_available(fsm); } /* - A single word must be available now */ if (words != 1) { dev_err(fsm->dev, "failed to clear bytes from the data FIFO\n"); return; } /* - Read the 32-bit word */ readl(fsm->base + SPI_FAST_SEQ_DATA_REG); dev_dbg(fsm->dev, "cleared %d byte(s) from the data FIFO\n", 4 - i); } static int stfsm_write_fifo(struct stfsm *fsm, const uint32_t *buf, uint32_t size) { uint32_t words = size >> 2; dev_dbg(fsm->dev, "writing %d bytes to FIFO\n", size); BUG_ON((((uintptr_t)buf) & 0x3) || (size & 0x3)); writesl(fsm->base + SPI_FAST_SEQ_DATA_REG, buf, words); return size; } static int stfsm_enter_32bit_addr(struct stfsm *fsm, int enter) { struct stfsm_seq *seq = &fsm->stfsm_seq_en_32bit_addr; uint32_t cmd = enter ? SPINOR_OP_EN4B : SPINOR_OP_EX4B; seq->seq_opc[0] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | SEQ_OPC_OPCODE(cmd) | SEQ_OPC_CSDEASSERT); stfsm_load_seq(fsm, seq); stfsm_wait_seq(fsm); return 0; } static uint8_t stfsm_wait_busy(struct stfsm *fsm) { struct stfsm_seq *seq = &stfsm_seq_read_status_fifo; unsigned long deadline; uint32_t status; int timeout = 0; /* Use RDRS1 */ seq->seq_opc[0] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | SEQ_OPC_OPCODE(SPINOR_OP_RDSR)); /* Load read_status sequence */ stfsm_load_seq(fsm, seq); /* * Repeat until busy bit is deasserted, or timeout, or error (S25FLxxxS) */ deadline = jiffies + FLASH_MAX_BUSY_WAIT; while (!timeout) { if (time_after_eq(jiffies, deadline)) timeout = 1; stfsm_wait_seq(fsm); stfsm_read_fifo(fsm, &status, 4); if ((status & FLASH_STATUS_BUSY) == 0) return 0; if ((fsm->configuration & CFG_S25FL_CHECK_ERROR_FLAGS) && ((status & S25FL_STATUS_P_ERR) || (status & S25FL_STATUS_E_ERR))) return (uint8_t)(status & 0xff); if (!timeout) /* Restart */ writel(seq->seq_cfg, fsm->base + SPI_FAST_SEQ_CFG); cond_resched(); } dev_err(fsm->dev, "timeout on wait_busy\n"); return FLASH_STATUS_TIMEOUT; } static int stfsm_read_status(struct stfsm *fsm, uint8_t cmd, uint8_t *data, int bytes) { struct stfsm_seq *seq = &stfsm_seq_read_status_fifo; uint32_t tmp; uint8_t *t = (uint8_t *)&tmp; int i; dev_dbg(fsm->dev, "read 'status' register [0x%02x], %d byte(s)\n", cmd, bytes); BUG_ON(bytes != 1 && bytes != 2); seq->seq_opc[0] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | SEQ_OPC_OPCODE(cmd)), stfsm_load_seq(fsm, seq); stfsm_read_fifo(fsm, &tmp, 4); for (i = 0; i < bytes; i++) data[i] = t[i]; stfsm_wait_seq(fsm); return 0; } static int stfsm_write_status(struct stfsm *fsm, uint8_t cmd, uint16_t data, int bytes, int wait_busy) { struct stfsm_seq *seq = &stfsm_seq_write_status; dev_dbg(fsm->dev, "write 'status' register [0x%02x], %d byte(s), 0x%04x\n" " %s wait-busy\n", cmd, bytes, data, wait_busy ? "with" : "no"); BUG_ON(bytes != 1 && bytes != 2); seq->seq_opc[1] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | SEQ_OPC_OPCODE(cmd)); seq->status = (uint32_t)data | STA_PADS_1 | STA_CSDEASSERT; seq->seq[2] = (bytes == 1) ? STFSM_INST_STA_WR1 : STFSM_INST_STA_WR1_2; stfsm_load_seq(fsm, seq); stfsm_wait_seq(fsm); if (wait_busy) stfsm_wait_busy(fsm); return 0; } /* * SoC reset on 'boot-from-spi' systems * * Certain modes of operation cause the Flash device to enter a particular state * for a period of time (e.g. 'Erase Sector', 'Quad Enable', and 'Enter 32-bit * Addr' commands). On boot-from-spi systems, it is important to consider what * happens if a warm reset occurs during this period. The SPIBoot controller * assumes that Flash device is in its default reset state, 24-bit address mode, * and ready to accept commands. This can be achieved using some form of * on-board logic/controller to force a device POR in response to a SoC-level * reset or by making use of the device reset signal if available (limited * number of devices only). * * Failure to take such precautions can cause problems following a warm reset. * For some operations (e.g. ERASE), there is little that can be done. For * other modes of operation (e.g. 32-bit addressing), options are often * available that can help minimise the window in which a reset could cause a * problem. * */ static bool stfsm_can_handle_soc_reset(struct stfsm *fsm) { /* Reset signal is available on the board and supported by the device */ if (fsm->reset_signal && fsm->info->flags & FLASH_FLAG_RESET) return true; /* Board-level logic forces a power-on-reset */ if (fsm->reset_por) return true; /* Reset is not properly handled and may result in failure to reboot */ return false; } /* Configure 'addr_cfg' according to addressing mode */ static void stfsm_prepare_erasesec_seq(struct stfsm *fsm, struct stfsm_seq *seq) { int addr1_cycles = fsm->info->flags & FLASH_FLAG_32BIT_ADDR ? 16 : 8; seq->addr_cfg = (ADR_CFG_CYCLES_ADD1(addr1_cycles) | ADR_CFG_PADS_1_ADD1 | ADR_CFG_CYCLES_ADD2(16) | ADR_CFG_PADS_1_ADD2 | ADR_CFG_CSDEASSERT_ADD2); } /* Search for preferred configuration based on available flags */ static struct seq_rw_config * stfsm_search_seq_rw_configs(struct stfsm *fsm, struct seq_rw_config cfgs[]) { struct seq_rw_config *config; int flags = fsm->info->flags; for (config = cfgs; config->cmd != 0; config++) if ((config->flags & flags) == config->flags) return config; return NULL; } /* Prepare a READ/WRITE sequence according to configuration parameters */ static void stfsm_prepare_rw_seq(struct stfsm *fsm, struct stfsm_seq *seq, struct seq_rw_config *cfg) { int addr1_cycles, addr2_cycles; int i = 0; memset(seq, 0, sizeof(*seq)); /* Add READ/WRITE OPC */ seq->seq_opc[i++] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | SEQ_OPC_OPCODE(cfg->cmd)); /* Add WREN OPC for a WRITE sequence */ if (cfg->write) seq->seq_opc[i++] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | SEQ_OPC_OPCODE(SPINOR_OP_WREN) | SEQ_OPC_CSDEASSERT); /* Address configuration (24 or 32-bit addresses) */ addr1_cycles = (fsm->info->flags & FLASH_FLAG_32BIT_ADDR) ? 16 : 8; addr1_cycles /= cfg->addr_pads; addr2_cycles = 16 / cfg->addr_pads; seq->addr_cfg = ((addr1_cycles & 0x3f) << 0 | /* ADD1 cycles */ (cfg->addr_pads - 1) << 6 | /* ADD1 pads */ (addr2_cycles & 0x3f) << 16 | /* ADD2 cycles */ ((cfg->addr_pads - 1) << 22)); /* ADD2 pads */ /* Data/Sequence configuration */ seq->seq_cfg = ((cfg->data_pads - 1) << 16 | SEQ_CFG_STARTSEQ | SEQ_CFG_CSDEASSERT); if (!cfg->write) seq->seq_cfg |= SEQ_CFG_READNOTWRITE; /* Mode configuration (no. of pads taken from addr cfg) */ seq->mode = ((cfg->mode_data & 0xff) << 0 | /* data */ (cfg->mode_cycles & 0x3f) << 16 | /* cycles */ (cfg->addr_pads - 1) << 22); /* pads */ /* Dummy configuration (no. of pads taken from addr cfg) */ seq->dummy = ((cfg->dummy_cycles & 0x3f) << 16 | /* cycles */ (cfg->addr_pads - 1) << 22); /* pads */ /* Instruction sequence */ i = 0; if (cfg->write) seq->seq[i++] = STFSM_INST_CMD2; seq->seq[i++] = STFSM_INST_CMD1; seq->seq[i++] = STFSM_INST_ADD1; seq->seq[i++] = STFSM_INST_ADD2; if (cfg->mode_cycles) seq->seq[i++] = STFSM_INST_MODE; if (cfg->dummy_cycles) seq->seq[i++] = STFSM_INST_DUMMY; seq->seq[i++] = cfg->write ? STFSM_INST_DATA_WRITE : STFSM_INST_DATA_READ; seq->seq[i++] = STFSM_INST_STOP; } static int stfsm_search_prepare_rw_seq(struct stfsm *fsm, struct stfsm_seq *seq, struct seq_rw_config *cfgs) { struct seq_rw_config *config; config = stfsm_search_seq_rw_configs(fsm, cfgs); if (!config) { dev_err(fsm->dev, "failed to find suitable config\n"); return -EINVAL; } stfsm_prepare_rw_seq(fsm, seq, config); return 0; } /* Prepare a READ/WRITE/ERASE 'default' sequences */ static int stfsm_prepare_rwe_seqs_default(struct stfsm *fsm) { uint32_t flags = fsm->info->flags; int ret; /* Configure 'READ' sequence */ ret = stfsm_search_prepare_rw_seq(fsm, &fsm->stfsm_seq_read, default_read_configs); if (ret) { dev_err(fsm->dev, "failed to prep READ sequence with flags [0x%08x]\n", flags); return ret; } /* Configure 'WRITE' sequence */ ret = stfsm_search_prepare_rw_seq(fsm, &fsm->stfsm_seq_write, default_write_configs); if (ret) { dev_err(fsm->dev, "failed to prep WRITE sequence with flags [0x%08x]\n", flags); return ret; } /* Configure 'ERASE_SECTOR' sequence */ stfsm_prepare_erasesec_seq(fsm, &stfsm_seq_erase_sector); return 0; } static int stfsm_mx25_config(struct stfsm *fsm) { uint32_t flags = fsm->info->flags; uint32_t data_pads; uint8_t sta; int ret; bool soc_reset; /* * Use default READ/WRITE sequences */ ret = stfsm_prepare_rwe_seqs_default(fsm); if (ret) return ret; /* * Configure 32-bit Address Support */ if (flags & FLASH_FLAG_32BIT_ADDR) { /* Configure 'enter_32bitaddr' FSM sequence */ stfsm_mx25_en_32bit_addr_seq(&fsm->stfsm_seq_en_32bit_addr); soc_reset = stfsm_can_handle_soc_reset(fsm); if (soc_reset || !fsm->booted_from_spi) /* If we can handle SoC resets, we enable 32-bit address * mode pervasively */ stfsm_enter_32bit_addr(fsm, 1); else /* Else, enable/disable 32-bit addressing before/after * each operation */ fsm->configuration = (CFG_READ_TOGGLE_32BIT_ADDR | CFG_WRITE_TOGGLE_32BIT_ADDR | CFG_ERASESEC_TOGGLE_32BIT_ADDR); } /* Check status of 'QE' bit, update if required. */ stfsm_read_status(fsm, SPINOR_OP_RDSR, &sta, 1); data_pads = ((fsm->stfsm_seq_read.seq_cfg >> 16) & 0x3) + 1; if (data_pads == 4) { if (!(sta & MX25_STATUS_QE)) { /* Set 'QE' */ sta |= MX25_STATUS_QE; stfsm_write_status(fsm, SPINOR_OP_WRSR, sta, 1, 1); } } else { if (sta & MX25_STATUS_QE) { /* Clear 'QE' */ sta &= ~MX25_STATUS_QE; stfsm_write_status(fsm, SPINOR_OP_WRSR, sta, 1, 1); } } return 0; } static int stfsm_n25q_config(struct stfsm *fsm) { uint32_t flags = fsm->info->flags; uint8_t vcr; int ret = 0; bool soc_reset; /* Configure 'READ' sequence */ if (flags & FLASH_FLAG_32BIT_ADDR) ret = stfsm_search_prepare_rw_seq(fsm, &fsm->stfsm_seq_read, n25q_read4_configs); else ret = stfsm_search_prepare_rw_seq(fsm, &fsm->stfsm_seq_read, n25q_read3_configs); if (ret) { dev_err(fsm->dev, "failed to prepare READ sequence with flags [0x%08x]\n", flags); return ret; } /* Configure 'WRITE' sequence (default configs) */ ret = stfsm_search_prepare_rw_seq(fsm, &fsm->stfsm_seq_write, default_write_configs); if (ret) { dev_err(fsm->dev, "preparing WRITE sequence using flags [0x%08x] failed\n", flags); return ret; } /* * Configure 'ERASE_SECTOR' sequence */ stfsm_prepare_erasesec_seq(fsm, &stfsm_seq_erase_sector); /* Configure 32-bit address support */ if (flags & FLASH_FLAG_32BIT_ADDR) { stfsm_n25q_en_32bit_addr_seq(&fsm->stfsm_seq_en_32bit_addr); soc_reset = stfsm_can_handle_soc_reset(fsm); if (soc_reset || !fsm->booted_from_spi) { /* * If we can handle SoC resets, we enable 32-bit * address mode pervasively */ stfsm_enter_32bit_addr(fsm, 1); } else { /* * If not, enable/disable for WRITE and ERASE * operations (READ uses special commands) */ fsm->configuration = (CFG_WRITE_TOGGLE_32BIT_ADDR | CFG_ERASESEC_TOGGLE_32BIT_ADDR); } } /* * Configure device to use 8 dummy cycles */ vcr = (N25Q_VCR_DUMMY_CYCLES(8) | N25Q_VCR_XIP_DISABLED | N25Q_VCR_WRAP_CONT); stfsm_write_status(fsm, N25Q_CMD_WRVCR, vcr, 1, 0); return 0; } static void stfsm_s25fl_prepare_erasesec_seq_32(struct stfsm_seq *seq) { seq->seq_opc[1] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | SEQ_OPC_OPCODE(S25FL_CMD_SE4)); seq->addr_cfg = (ADR_CFG_CYCLES_ADD1(16) | ADR_CFG_PADS_1_ADD1 | ADR_CFG_CYCLES_ADD2(16) | ADR_CFG_PADS_1_ADD2 | ADR_CFG_CSDEASSERT_ADD2); } static void stfsm_s25fl_read_dyb(struct stfsm *fsm, uint32_t offs, uint8_t *dby) { uint32_t tmp; struct stfsm_seq seq = { .data_size = TRANSFER_SIZE(4), .seq_opc[0] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | SEQ_OPC_OPCODE(S25FL_CMD_DYBRD)), .addr_cfg = (ADR_CFG_CYCLES_ADD1(16) | ADR_CFG_PADS_1_ADD1 | ADR_CFG_CYCLES_ADD2(16) | ADR_CFG_PADS_1_ADD2), .addr1 = (offs >> 16) & 0xffff, .addr2 = offs & 0xffff, .seq = { STFSM_INST_CMD1, STFSM_INST_ADD1, STFSM_INST_ADD2, STFSM_INST_DATA_READ, STFSM_INST_STOP, }, .seq_cfg = (SEQ_CFG_PADS_1 | SEQ_CFG_READNOTWRITE | SEQ_CFG_CSDEASSERT | SEQ_CFG_STARTSEQ), }; stfsm_load_seq(fsm, &seq); stfsm_read_fifo(fsm, &tmp, 4); *dby = (uint8_t)(tmp >> 24); stfsm_wait_seq(fsm); } static void stfsm_s25fl_write_dyb(struct stfsm *fsm, uint32_t offs, uint8_t dby) { struct stfsm_seq seq = { .seq_opc[0] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | SEQ_OPC_OPCODE(SPINOR_OP_WREN) | SEQ_OPC_CSDEASSERT), .seq_opc[1] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | SEQ_OPC_OPCODE(S25FL_CMD_DYBWR)), .addr_cfg = (ADR_CFG_CYCLES_ADD1(16) | ADR_CFG_PADS_1_ADD1 | ADR_CFG_CYCLES_ADD2(16) | ADR_CFG_PADS_1_ADD2), .status = (uint32_t)dby | STA_PADS_1 | STA_CSDEASSERT, .addr1 = (offs >> 16) & 0xffff, .addr2 = offs & 0xffff, .seq = { STFSM_INST_CMD1, STFSM_INST_CMD2, STFSM_INST_ADD1, STFSM_INST_ADD2, STFSM_INST_STA_WR1, STFSM_INST_STOP, }, .seq_cfg = (SEQ_CFG_PADS_1 | SEQ_CFG_READNOTWRITE | SEQ_CFG_CSDEASSERT | SEQ_CFG_STARTSEQ), }; stfsm_load_seq(fsm, &seq); stfsm_wait_seq(fsm); stfsm_wait_busy(fsm); } static int stfsm_s25fl_clear_status_reg(struct stfsm *fsm) { struct stfsm_seq seq = { .seq_opc[0] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | SEQ_OPC_OPCODE(S25FL_CMD_CLSR) | SEQ_OPC_CSDEASSERT), .seq_opc[1] = (SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) | SEQ_OPC_OPCODE(SPINOR_OP_WRDI) | SEQ_OPC_CSDEASSERT), .seq = { STFSM_INST_CMD1, STFSM_INST_CMD2, STFSM_INST_WAIT, STFSM_INST_STOP, }, .seq_cfg = (SEQ_CFG_PADS_1 | SEQ_CFG_ERASE | SEQ_CFG_READNOTWRITE | SEQ_CFG_CSDEASSERT | SEQ_CFG_STARTSEQ), }; stfsm_load_seq(fsm, &seq); stfsm_wait_seq(fsm); return 0; } static int stfsm_s25fl_config(struct stfsm *fsm) { struct flash_info *info = fsm->info; uint32_t flags = info->flags; uint32_t data_pads; uint32_t offs; uint16_t sta_wr; uint8_t sr1, cr1, dyb; int update_sr = 0; int ret; if (flags & FLASH_FLAG_32BIT_ADDR) { /* * Prepare Read/Write/Erase sequences according to S25FLxxx * 32-bit address command set */ ret = stfsm_search_prepare_rw_seq(fsm, &fsm->stfsm_seq_read, stfsm_s25fl_read4_configs); if (ret) return ret; ret = stfsm_search_prepare_rw_seq(fsm, &fsm->stfsm_seq_write, stfsm_s25fl_write4_configs); if (ret) return ret; stfsm_s25fl_prepare_erasesec_seq_32(&stfsm_seq_erase_sector); } else { /* Use default configurations for 24-bit addressing */ ret = stfsm_prepare_rwe_seqs_default(fsm); if (ret) return ret; } /* * For devices that support 'DYB' sector locking, check lock status and * unlock sectors if necessary (some variants power-on with sectors * locked by default) */ if (flags & FLASH_FLAG_DYB_LOCKING) { offs = 0; for (offs = 0; offs < info->sector_size * info->n_sectors;) { stfsm_s25fl_read_dyb(fsm, offs, &dyb); if (dyb == 0x00) stfsm_s25fl_write_dyb(fsm, offs, 0xff); /* Handle bottom/top 4KiB parameter sectors */ if ((offs < info->sector_size * 2) || (offs >= (info->sector_size - info->n_sectors * 4))) offs += 0x1000; else offs += 0x10000; } } /* Check status of 'QE' bit, update if required. */ stfsm_read_status(fsm, SPINOR_OP_RDCR, &cr1, 1); data_pads = ((fsm->stfsm_seq_read.seq_cfg >> 16) & 0x3) + 1; if (data_pads == 4) { if (!(cr1 & STFSM_S25FL_CONFIG_QE)) { /* Set 'QE' */ cr1 |= STFSM_S25FL_CONFIG_QE; update_sr = 1; } } else { if (cr1 & STFSM_S25FL_CONFIG_QE) { /* Clear 'QE' */ cr1 &= ~STFSM_S25FL_CONFIG_QE; update_sr = 1; } } if (update_sr) { stfsm_read_status(fsm, SPINOR_OP_RDSR, &sr1, 1); sta_wr = ((uint16_t)cr1 << 8) | sr1; stfsm_write_status(fsm, SPINOR_OP_WRSR, sta_wr, 2, 1); } /* * S25FLxxx devices support Program and Error error flags. * Configure driver to check flags and clear if necessary. */ fsm->configuration |= CFG_S25FL_CHECK_ERROR_FLAGS; return 0; } static int stfsm_w25q_config(struct stfsm *fsm) { uint32_t data_pads; uint8_t sr1, sr2; uint16_t sr_wr; int update_sr = 0; int ret; ret = stfsm_prepare_rwe_seqs_default(fsm); if (ret) return ret; /* Check status of 'QE' bit, update if required. */ stfsm_read_status(fsm, SPINOR_OP_RDCR, &sr2, 1); data_pads = ((fsm->stfsm_seq_read.seq_cfg >> 16) & 0x3) + 1; if (data_pads == 4) { if (!(sr2 & W25Q_STATUS_QE)) { /* Set 'QE' */ sr2 |= W25Q_STATUS_QE; update_sr = 1; } } else { if (sr2 & W25Q_STATUS_QE) { /* Clear 'QE' */ sr2 &= ~W25Q_STATUS_QE; update_sr = 1; } } if (update_sr) { /* Write status register */ stfsm_read_status(fsm, SPINOR_OP_RDSR, &sr1, 1); sr_wr = ((uint16_t)sr2 << 8) | sr1; stfsm_write_status(fsm, SPINOR_OP_WRSR, sr_wr, 2, 1); } return 0; } static int stfsm_read(struct stfsm *fsm, uint8_t *buf, uint32_t size, uint32_t offset) { struct stfsm_seq *seq = &fsm->stfsm_seq_read; uint32_t data_pads; uint32_t read_mask; uint32_t size_ub; uint32_t size_lb; uint32_t size_mop; uint32_t tmp[4]; uint32_t page_buf[FLASH_PAGESIZE_32]; uint8_t *p; dev_dbg(fsm->dev, "reading %d bytes from 0x%08x\n", size, offset); /* Enter 32-bit address mode, if required */ if (fsm->configuration & CFG_READ_TOGGLE_32BIT_ADDR) stfsm_enter_32bit_addr(fsm, 1); /* Must read in multiples of 32 cycles (or 32*pads/8 Bytes) */ data_pads = ((seq->seq_cfg >> 16) & 0x3) + 1; read_mask = (data_pads << 2) - 1; /* Handle non-aligned buf */ p = ((uintptr_t)buf & 0x3) ? (uint8_t *)page_buf : buf; /* Handle non-aligned size */ size_ub = (size + read_mask) & ~read_mask; size_lb = size & ~read_mask; size_mop = size & read_mask; seq->data_size = TRANSFER_SIZE(size_ub); seq->addr1 = (offset >> 16) & 0xffff; seq->addr2 = offset & 0xffff; stfsm_load_seq(fsm, seq); if (size_lb) stfsm_read_fifo(fsm, (uint32_t *)p, size_lb); if (size_mop) { stfsm_read_fifo(fsm, tmp, read_mask + 1); memcpy(p + size_lb, &tmp, size_mop); } /* Handle non-aligned buf */ if ((uintptr_t)buf & 0x3) memcpy(buf, page_buf, size); /* Wait for sequence to finish */ stfsm_wait_seq(fsm); stfsm_clear_fifo(fsm); /* Exit 32-bit address mode, if required */ if (fsm->configuration & CFG_READ_TOGGLE_32BIT_ADDR) stfsm_enter_32bit_addr(fsm, 0); return 0; } static int stfsm_write(struct stfsm *fsm, const uint8_t *buf, uint32_t size, uint32_t offset) { struct stfsm_seq *seq = &fsm->stfsm_seq_write; uint32_t data_pads; uint32_t write_mask; uint32_t size_ub; uint32_t size_lb; uint32_t size_mop; uint32_t tmp[4]; uint32_t i; uint32_t page_buf[FLASH_PAGESIZE_32]; uint8_t *t = (uint8_t *)&tmp; const uint8_t *p; int ret; dev_dbg(fsm->dev, "writing %d bytes to 0x%08x\n", size, offset); /* Enter 32-bit address mode, if required */ if (fsm->configuration & CFG_WRITE_TOGGLE_32BIT_ADDR) stfsm_enter_32bit_addr(fsm, 1); /* Must write in multiples of 32 cycles (or 32*pads/8 bytes) */ data_pads = ((seq->seq_cfg >> 16) & 0x3) + 1; write_mask = (data_pads << 2) - 1; /* Handle non-aligned buf */ if ((uintptr_t)buf & 0x3) { memcpy(page_buf, buf, size); p = (uint8_t *)page_buf; } else { p = buf; } /* Handle non-aligned size */ size_ub = (size + write_mask) & ~write_mask; size_lb = size & ~write_mask; size_mop = size & write_mask; seq->data_size = TRANSFER_SIZE(size_ub); seq->addr1 = (offset >> 16) & 0xffff; seq->addr2 = offset & 0xffff; /* Need to set FIFO to write mode, before writing data to FIFO (see * GNBvb79594) */ writel(0x00040000, fsm->base + SPI_FAST_SEQ_CFG); /* * Before writing data to the FIFO, apply a small delay to allow a * potential change of FIFO direction to complete. */ if (fsm->fifo_dir_delay == 0) readl(fsm->base + SPI_FAST_SEQ_CFG); else udelay(fsm->fifo_dir_delay); /* Write data to FIFO, before starting sequence (see GNBvd79593) */ if (size_lb) { stfsm_write_fifo(fsm, (uint32_t *)p, size_lb); p += size_lb; } /* Handle non-aligned size */ if (size_mop) { memset(t, 0xff, write_mask + 1); /* fill with 0xff's */ for (i = 0; i < size_mop; i++) t[i] = *p++; stfsm_write_fifo(fsm, tmp, write_mask + 1); } /* Start sequence */ stfsm_load_seq(fsm, seq); /* Wait for sequence to finish */ stfsm_wait_seq(fsm); /* Wait for completion */ ret = stfsm_wait_busy(fsm); if (ret && fsm->configuration & CFG_S25FL_CHECK_ERROR_FLAGS) stfsm_s25fl_clear_status_reg(fsm); /* Exit 32-bit address mode, if required */ if (fsm->configuration & CFG_WRITE_TOGGLE_32BIT_ADDR) stfsm_enter_32bit_addr(fsm, 0); return 0; } /* * Read an address range from the flash chip. The address range * may be any size provided it is within the physical boundaries. */ static int stfsm_mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf) { struct stfsm *fsm = dev_get_drvdata(mtd->dev.parent); uint32_t bytes; dev_dbg(fsm->dev, "%s from 0x%08x, len %zd\n", __func__, (u32)from, len); mutex_lock(&fsm->lock); while (len > 0) { bytes = min_t(size_t, len, FLASH_PAGESIZE); stfsm_read(fsm, buf, bytes, from); buf += bytes; from += bytes; len -= bytes; *retlen += bytes; } mutex_unlock(&fsm->lock); return 0; } static int stfsm_erase_sector(struct stfsm *fsm, uint32_t offset) { struct stfsm_seq *seq = &stfsm_seq_erase_sector; int ret; dev_dbg(fsm->dev, "erasing sector at 0x%08x\n", offset); /* Enter 32-bit address mode, if required */ if (fsm->configuration & CFG_ERASESEC_TOGGLE_32BIT_ADDR) stfsm_enter_32bit_addr(fsm, 1); seq->addr1 = (offset >> 16) & 0xffff; seq->addr2 = offset & 0xffff; stfsm_load_seq(fsm, seq); stfsm_wait_seq(fsm); /* Wait for completion */ ret = stfsm_wait_busy(fsm); if (ret && fsm->configuration & CFG_S25FL_CHECK_ERROR_FLAGS) stfsm_s25fl_clear_status_reg(fsm); /* Exit 32-bit address mode, if required */ if (fsm->configuration & CFG_ERASESEC_TOGGLE_32BIT_ADDR) stfsm_enter_32bit_addr(fsm, 0); return ret; } static int stfsm_erase_chip(struct stfsm *fsm) { const struct stfsm_seq *seq = &stfsm_seq_erase_chip; dev_dbg(fsm->dev, "erasing chip\n"); stfsm_load_seq(fsm, seq); stfsm_wait_seq(fsm); return stfsm_wait_busy(fsm); } /* * Write an address range to the flash chip. Data must be written in * FLASH_PAGESIZE chunks. The address range may be any size provided * it is within the physical boundaries. */ static int stfsm_mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf) { struct stfsm *fsm = dev_get_drvdata(mtd->dev.parent); u32 page_offs; u32 bytes; uint8_t *b = (uint8_t *)buf; int ret = 0; dev_dbg(fsm->dev, "%s to 0x%08x, len %zd\n", __func__, (u32)to, len); /* Offset within page */ page_offs = to % FLASH_PAGESIZE; mutex_lock(&fsm->lock); while (len) { /* Write up to page boundary */ bytes = min_t(size_t, FLASH_PAGESIZE - page_offs, len); ret = stfsm_write(fsm, b, bytes, to); if (ret) goto out1; b += bytes; len -= bytes; to += bytes; /* We are now page-aligned */ page_offs = 0; *retlen += bytes; } out1: mutex_unlock(&fsm->lock); return ret; } /* * Erase an address range on the flash chip. The address range may extend * one or more erase sectors. Return an error is there is a problem erasing. */ static int stfsm_mtd_erase(struct mtd_info *mtd, struct erase_info *instr) { struct stfsm *fsm = dev_get_drvdata(mtd->dev.parent); u32 addr, len; int ret; dev_dbg(fsm->dev, "%s at 0x%llx, len %lld\n", __func__, (long long)instr->addr, (long long)instr->len); addr = instr->addr; len = instr->len; mutex_lock(&fsm->lock); /* Whole-chip erase? */ if (len == mtd->size) { ret = stfsm_erase_chip(fsm); if (ret) goto out1; } else { while (len) { ret = stfsm_erase_sector(fsm, addr); if (ret) goto out1; addr += mtd->erasesize; len -= mtd->erasesize; } } mutex_unlock(&fsm->lock); return 0; out1: mutex_unlock(&fsm->lock); return ret; } static void stfsm_read_jedec(struct stfsm *fsm, uint8_t *jedec) { const struct stfsm_seq *seq = &stfsm_seq_read_jedec; uint32_t tmp[2]; stfsm_load_seq(fsm, seq); stfsm_read_fifo(fsm, tmp, 8); memcpy(jedec, tmp, 5); stfsm_wait_seq(fsm); } static struct flash_info *stfsm_jedec_probe(struct stfsm *fsm) { struct flash_info *info; u16 ext_jedec; u32 jedec; u8 id[5]; stfsm_read_jedec(fsm, id); jedec = id[0] << 16 | id[1] << 8 | id[2]; /* * JEDEC also defines an optional "extended device information" * string for after vendor-specific data, after the three bytes * we use here. Supporting some chips might require using it. */ ext_jedec = id[3] << 8 | id[4]; dev_dbg(fsm->dev, "JEDEC = 0x%08x [%5ph]\n", jedec, id); for (info = flash_types; info->name; info++) { if (info->jedec_id == jedec) { if (info->ext_id && info->ext_id != ext_jedec) continue; return info; } } dev_err(fsm->dev, "Unrecognized JEDEC id %06x\n", jedec); return NULL; } static int stfsm_set_mode(struct stfsm *fsm, uint32_t mode) { int ret, timeout = 10; /* Wait for controller to accept mode change */ while (--timeout) { ret = readl(fsm->base + SPI_STA_MODE_CHANGE); if (ret & 0x1) break; udelay(1); } if (!timeout) return -EBUSY; writel(mode, fsm->base + SPI_MODESELECT); return 0; } static void stfsm_set_freq(struct stfsm *fsm, uint32_t spi_freq) { uint32_t emi_freq; uint32_t clk_div; emi_freq = clk_get_rate(fsm->clk); /* * Calculate clk_div - values between 2 and 128 * Multiple of 2, rounded up */ clk_div = 2 * DIV_ROUND_UP(emi_freq, 2 * spi_freq); if (clk_div < 2) clk_div = 2; else if (clk_div > 128) clk_div = 128; /* * Determine a suitable delay for the IP to complete a change of * direction of the FIFO. The required delay is related to the clock * divider used. The following heuristics are based on empirical tests, * using a 100MHz EMI clock. */ if (clk_div <= 4) fsm->fifo_dir_delay = 0; else if (clk_div <= 10) fsm->fifo_dir_delay = 1; else fsm->fifo_dir_delay = DIV_ROUND_UP(clk_div, 10); dev_dbg(fsm->dev, "emi_clk = %uHZ, spi_freq = %uHZ, clk_div = %u\n", emi_freq, spi_freq, clk_div); writel(clk_div, fsm->base + SPI_CLOCKDIV); } static int stfsm_init(struct stfsm *fsm) { int ret; /* Perform a soft reset of the FSM controller */ writel(SEQ_CFG_SWRESET, fsm->base + SPI_FAST_SEQ_CFG); udelay(1); writel(0, fsm->base + SPI_FAST_SEQ_CFG); /* Set clock to 'safe' frequency initially */ stfsm_set_freq(fsm, STFSM_FLASH_SAFE_FREQ); /* Switch to FSM */ ret = stfsm_set_mode(fsm, SPI_MODESELECT_FSM); if (ret) return ret; /* Set timing parameters */ writel(SPI_CFG_DEVICE_ST | SPI_CFG_DEFAULT_MIN_CS_HIGH | SPI_CFG_DEFAULT_CS_SETUPHOLD | SPI_CFG_DEFAULT_DATA_HOLD, fsm->base + SPI_CONFIGDATA); writel(STFSM_DEFAULT_WR_TIME, fsm->base + SPI_STATUS_WR_TIME_REG); /* * Set the FSM 'WAIT' delay to the minimum workable value. Note, for * our purposes, the WAIT instruction is used purely to achieve * "sequence validity" rather than actually implement a delay. */ writel(0x00000001, fsm->base + SPI_PROGRAM_ERASE_TIME); /* Clear FIFO, just in case */ stfsm_clear_fifo(fsm); return 0; } static void stfsm_fetch_platform_configs(struct platform_device *pdev) { struct stfsm *fsm = platform_get_drvdata(pdev); struct device_node *np = pdev->dev.of_node; struct regmap *regmap; uint32_t boot_device_reg; uint32_t boot_device_spi; uint32_t boot_device; /* Value we read from *boot_device_reg */ int ret; /* Booting from SPI NOR Flash is the default */ fsm->booted_from_spi = true; regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg"); if (IS_ERR(regmap)) goto boot_device_fail; fsm->reset_signal = of_property_read_bool(np, "st,reset-signal"); fsm->reset_por = of_property_read_bool(np, "st,reset-por"); /* Where in the syscon the boot device information lives */ ret = of_property_read_u32(np, "st,boot-device-reg", &boot_device_reg); if (ret) goto boot_device_fail; /* Boot device value when booted from SPI NOR */ ret = of_property_read_u32(np, "st,boot-device-spi", &boot_device_spi); if (ret) goto boot_device_fail; ret = regmap_read(regmap, boot_device_reg, &boot_device); if (ret) goto boot_device_fail; if (boot_device != boot_device_spi) fsm->booted_from_spi = false; return; boot_device_fail: dev_warn(&pdev->dev, "failed to fetch boot device, assuming boot from SPI\n"); } static int stfsm_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; struct flash_info *info; struct resource *res; struct stfsm *fsm; int ret; if (!np) { dev_err(&pdev->dev, "No DT found\n"); return -EINVAL; } fsm = devm_kzalloc(&pdev->dev, sizeof(*fsm), GFP_KERNEL); if (!fsm) return -ENOMEM; fsm->dev = &pdev->dev; platform_set_drvdata(pdev, fsm); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { dev_err(&pdev->dev, "Resource not found\n"); return -ENODEV; } fsm->base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(fsm->base)) { dev_err(&pdev->dev, "Failed to reserve memory region %pR\n", res); return PTR_ERR(fsm->base); } fsm->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(fsm->clk)) { dev_err(fsm->dev, "Couldn't find EMI clock.\n"); return PTR_ERR(fsm->clk); } ret = clk_prepare_enable(fsm->clk); if (ret) { dev_err(fsm->dev, "Failed to enable EMI clock.\n"); return ret; } mutex_init(&fsm->lock); ret = stfsm_init(fsm); if (ret) { dev_err(&pdev->dev, "Failed to initialise FSM Controller\n"); goto err_clk_unprepare; } stfsm_fetch_platform_configs(pdev); /* Detect SPI FLASH device */ info = stfsm_jedec_probe(fsm); if (!info) { ret = -ENODEV; goto err_clk_unprepare; } fsm->info = info; /* Use device size to determine address width */ if (info->sector_size * info->n_sectors > 0x1000000) info->flags |= FLASH_FLAG_32BIT_ADDR; /* * Configure READ/WRITE/ERASE sequences according to platform and * device flags. */ if (info->config) { ret = info->config(fsm); if (ret) goto err_clk_unprepare; } else { ret = stfsm_prepare_rwe_seqs_default(fsm); if (ret) goto err_clk_unprepare; } fsm->mtd.name = info->name; fsm->mtd.dev.parent = &pdev->dev; mtd_set_of_node(&fsm->mtd, np); fsm->mtd.type = MTD_NORFLASH; fsm->mtd.writesize = 4; fsm->mtd.writebufsize = fsm->mtd.writesize; fsm->mtd.flags = MTD_CAP_NORFLASH; fsm->mtd.size = info->sector_size * info->n_sectors; fsm->mtd.erasesize = info->sector_size; fsm->mtd._read = stfsm_mtd_read; fsm->mtd._write = stfsm_mtd_write; fsm->mtd._erase = stfsm_mtd_erase; dev_info(&pdev->dev, "Found serial flash device: %s\n" " size = %llx (%lldMiB) erasesize = 0x%08x (%uKiB)\n", info->name, (long long)fsm->mtd.size, (long long)(fsm->mtd.size >> 20), fsm->mtd.erasesize, (fsm->mtd.erasesize >> 10)); return mtd_device_register(&fsm->mtd, NULL, 0); err_clk_unprepare: clk_disable_unprepare(fsm->clk); return ret; } static int stfsm_remove(struct platform_device *pdev) { struct stfsm *fsm = platform_get_drvdata(pdev); return mtd_device_unregister(&fsm->mtd); } #ifdef CONFIG_PM_SLEEP static int stfsmfsm_suspend(struct device *dev) { struct stfsm *fsm = dev_get_drvdata(dev); clk_disable_unprepare(fsm->clk); return 0; } static int stfsmfsm_resume(struct device *dev) { struct stfsm *fsm = dev_get_drvdata(dev); return clk_prepare_enable(fsm->clk); } #endif static SIMPLE_DEV_PM_OPS(stfsm_pm_ops, stfsmfsm_suspend, stfsmfsm_resume); static const struct of_device_id stfsm_match[] = { { .compatible = "st,spi-fsm", }, {}, }; MODULE_DEVICE_TABLE(of, stfsm_match); static struct platform_driver stfsm_driver = { .probe = stfsm_probe, .remove = stfsm_remove, .driver = { .name = "st-spi-fsm", .of_match_table = stfsm_match, .pm = &stfsm_pm_ops, }, }; module_platform_driver(stfsm_driver); MODULE_AUTHOR("Angus Clark <angus.clark@st.com>"); MODULE_DESCRIPTION("ST SPI FSM driver"); MODULE_LICENSE("GPL");
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