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[92.233.57.238]) by mx.google.com with ESMTPSA id j9sm48125217wjx.18.2014.01.08.05.49.18 for (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 08 Jan 2014 05:49:19 -0800 (PST) From: Lee Jones To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: computersforpeace@gmail.com, angus.clark@st.com, Lee Jones Subject: [PATCH v4 36/37] mtd: st_spi_fsm: Move runtime configurable msg sequences into device's struct Date: Wed, 8 Jan 2014 13:47:19 +0000 Message-Id: <1389188840-14306-37-git-send-email-lee.jones@linaro.org> X-Mailer: git-send-email 1.8.3.2 In-Reply-To: <1389188840-14306-1-git-send-email-lee.jones@linaro.org> References: <1389188840-14306-1-git-send-email-lee.jones@linaro.org> X-Removed-Original-Auth: Dkim didn't pass. X-Original-Sender: lee.jones@linaro.org X-Original-Authentication-Results: mx.google.com; spf=neutral (google.com: 209.85.128.182 is neither permitted nor denied by best guess record for domain of patch+caf_=patchwork-forward=linaro.org@linaro.org) smtp.mail=patch+caf_=patchwork-forward=linaro.org@linaro.org Precedence: list Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org List-ID: X-Google-Group-Id: 836684582541 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , Until now the dynamically configurable message sequences for read, write and enable 32bit addressing have been global. Brian makes a good point why this should not be the case. If there are ever two FSM's located on the same platform, we could be potentially introducing a race condition on "needlessly shared data". Suggested-by: Brian Norris Signed-off-by: Lee Jones --- drivers/mtd/devices/st_spi_fsm.c | 64 ++++++++++++++++++++-------------------- 1 file changed, 32 insertions(+), 32 deletions(-) diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c index ddfff35..541e867 100644 --- a/drivers/mtd/devices/st_spi_fsm.c +++ b/drivers/mtd/devices/st_spi_fsm.c @@ -271,6 +271,19 @@ #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; @@ -284,20 +297,11 @@ struct stfsm { bool booted_from_spi; bool reset_signal; bool reset_por; -}; -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_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 { @@ -585,10 +589,6 @@ static struct seq_rw_config stfsm_s25fl_write4_configs[] = { */ #define W25Q_STATUS_QE (0x1 << 9) -static struct stfsm_seq stfsm_seq_read; /* Dynamically populated */ -static struct stfsm_seq stfsm_seq_write; /* Dynamically populated */ -static struct stfsm_seq stfsm_seq_en_32bit_addr;/* Dynamically populated */ - static struct stfsm_seq stfsm_seq_read_jedec = { .data_size = TRANSFER_SIZE(8), .seq_opc[0] = (SEQ_OPC_PADS_1 | @@ -819,7 +819,7 @@ static int stfsm_write_fifo(struct stfsm *fsm, static int stfsm_enter_32bit_addr(struct stfsm *fsm, int enter) { - struct stfsm_seq *seq = &stfsm_seq_en_32bit_addr; + struct stfsm_seq *seq = &fsm->stfsm_seq_en_32bit_addr; uint32_t cmd = enter ? FLASH_CMD_EN4B_ADDR : FLASH_CMD_EX4B_ADDR; seq->seq_opc[0] = (SEQ_OPC_PADS_1 | @@ -1091,7 +1091,7 @@ static int stfsm_prepare_rwe_seqs_default(struct stfsm *fsm) int ret; /* Configure 'READ' sequence */ - ret = stfsm_search_prepare_rw_seq(fsm, &stfsm_seq_read, + ret = stfsm_search_prepare_rw_seq(fsm, &fsm->stfsm_seq_read, default_read_configs); if (ret) { dev_err(fsm->dev, @@ -1101,7 +1101,7 @@ static int stfsm_prepare_rwe_seqs_default(struct stfsm *fsm) } /* Configure 'WRITE' sequence */ - ret = stfsm_search_prepare_rw_seq(fsm, &stfsm_seq_write, + ret = stfsm_search_prepare_rw_seq(fsm, &fsm->stfsm_seq_write, default_write_configs); if (ret) { dev_err(fsm->dev, @@ -1136,7 +1136,7 @@ static int stfsm_mx25_config(struct stfsm *fsm) */ if (flags & FLASH_FLAG_32BIT_ADDR) { /* Configure 'enter_32bitaddr' FSM sequence */ - stfsm_mx25_en_32bit_addr_seq(&stfsm_seq_en_32bit_addr); + 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) { @@ -1159,7 +1159,7 @@ static int stfsm_mx25_config(struct stfsm *fsm) } /* For QUAD mode, set 'QE' STATUS bit */ - data_pads = ((stfsm_seq_read.seq_cfg >> 16) & 0x3) + 1; + data_pads = ((fsm->stfsm_seq_read.seq_cfg >> 16) & 0x3) + 1; if (data_pads == 4) { stfsm_read_status(fsm, FLASH_CMD_RDSR, &sta); sta |= MX25_STATUS_QE; @@ -1178,10 +1178,10 @@ static int stfsm_n25q_config(struct stfsm *fsm) /* Configure 'READ' sequence */ if (flags & FLASH_FLAG_32BIT_ADDR) - ret = stfsm_search_prepare_rw_seq(fsm, &stfsm_seq_read, + ret = stfsm_search_prepare_rw_seq(fsm, &fsm->stfsm_seq_read, n25q_read4_configs); else - ret = stfsm_search_prepare_rw_seq(fsm, &stfsm_seq_read, + ret = stfsm_search_prepare_rw_seq(fsm, &fsm->stfsm_seq_read, n25q_read3_configs); if (ret) { dev_err(fsm->dev, @@ -1191,7 +1191,7 @@ static int stfsm_n25q_config(struct stfsm *fsm) } /* Configure 'WRITE' sequence (default configs) */ - ret = stfsm_search_prepare_rw_seq(fsm, &stfsm_seq_write, + ret = stfsm_search_prepare_rw_seq(fsm, &fsm->stfsm_seq_write, default_write_configs); if (ret) { dev_err(fsm->dev, @@ -1205,7 +1205,7 @@ static int stfsm_n25q_config(struct stfsm *fsm) /* Configure 32-bit address support */ if (flags & FLASH_FLAG_32BIT_ADDR) { - stfsm_n25q_en_32bit_addr_seq(&stfsm_seq_en_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) { @@ -1364,12 +1364,12 @@ static int stfsm_s25fl_config(struct stfsm *fsm) * Prepare Read/Write/Erase sequences according to S25FLxxx * 32-bit address command set */ - ret = stfsm_search_prepare_rw_seq(fsm, &stfsm_seq_read, + 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, &stfsm_seq_write, + ret = stfsm_search_prepare_rw_seq(fsm, &fsm->stfsm_seq_write, stfsm_s25fl_write4_configs); if (ret) return ret; @@ -1405,7 +1405,7 @@ static int stfsm_s25fl_config(struct stfsm *fsm) } /* Check status of 'QE' bit */ - data_pads = ((stfsm_seq_read.seq_cfg >> 16) & 0x3) + 1; + data_pads = ((fsm->stfsm_seq_read.seq_cfg >> 16) & 0x3) + 1; stfsm_read_status(fsm, FLASH_CMD_RDSR2, &cr1); if (data_pads == 4) { if (!(cr1 & STFSM_S25FL_CONFIG_QE)) { @@ -1455,7 +1455,7 @@ static int stfsm_w25q_config(struct stfsm *fsm) return ret; /* If using QUAD mode, set QE STATUS bit */ - data_pads = ((stfsm_seq_read.seq_cfg >> 16) & 0x3) + 1; + data_pads = ((fsm->stfsm_seq_read.seq_cfg >> 16) & 0x3) + 1; if (data_pads == 4) { stfsm_read_status(fsm, FLASH_CMD_RDSR, &sta1); stfsm_read_status(fsm, FLASH_CMD_RDSR2, &sta2); @@ -1475,7 +1475,7 @@ static int stfsm_w25q_config(struct stfsm *fsm) static int stfsm_read(struct stfsm *fsm, uint8_t *buf, uint32_t size, uint32_t offset) { - struct stfsm_seq *seq = &stfsm_seq_read; + struct stfsm_seq *seq = &fsm->stfsm_seq_read; uint32_t data_pads; uint32_t read_mask; uint32_t size_ub; @@ -1536,7 +1536,7 @@ static int stfsm_read(struct stfsm *fsm, uint8_t *buf, uint32_t size, static int stfsm_write(struct stfsm *fsm, const uint8_t *const buf, const uint32_t size, const uint32_t offset) { - struct stfsm_seq *seq = &stfsm_seq_write; + struct stfsm_seq *seq = &fsm->stfsm_seq_write; uint32_t data_pads; uint32_t write_mask; uint32_t size_ub;