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Commit fa5ba3af authored by Lee Jones's avatar Lee Jones Committed by Brian Norris
Browse files

mtd: st_spi_fsm: Provide the erase one sector sequence 



The FSM Serial Flash Controller is driven by issuing a standard set of
register writes we call a message sequence. This patch supplies a method
to prepare the message sequence responsible for erasing a single sector.

Acked-by Angus Clark <angus.clark@st.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
Signed-off-by: default avatarBrian Norris <computersforpeace@gmail.com>
parent a63984c1

drivers/mtd/devices/st_spi_fsm.c

+35 −0
Original line number Diff line number Diff line
@@ -389,6 +389,28 @@ static struct stfsm_seq stfsm_seq_read_jedec = { 
		    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(FLASH_CMD_WREN) | SEQ_OPC_CSDEASSERT),



		(SEQ_OPC_PADS_1 | SEQ_OPC_CYCLES(8) |

		 SEQ_OPC_OPCODE(FLASH_CMD_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 inline int stfsm_is_idle(struct stfsm *fsm)

{

	return readl(fsm->base + SPI_FAST_SEQ_STA) & 0x10;
@@ -477,6 +499,19 @@ static void stfsm_read_fifo(struct stfsm *fsm, uint32_t *buf, 
	}

}



/* 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,