From: Tudor Ambarus <tudor.ambarus@microchip.com>
To: <p.yadav@ti.com>, <michael@walle.cc>
Cc: <miquel.raynal@bootlin.com>, <richard@nod.at>, <vigneshr@ti.com>,
<linux-mtd@lists.infradead.org>, <linux-kernel@vger.kernel.org>,
<Takahiro.Kuwano@infineon.com>,
Tudor Ambarus <tudor.ambarus@microchip.com>
Subject: [PATCH v4 08/11] mtd: spi-nor: spansion: Rework spi_nor_cypress_octal_dtr_enable()
Date: Wed, 20 Apr 2022 13:34:24 +0300 [thread overview]
Message-ID: <20220420103427.47867-9-tudor.ambarus@microchip.com> (raw)
In-Reply-To: <20220420103427.47867-1-tudor.ambarus@microchip.com>
Introduce template operation to remove code duplication.
Split spi_nor_cypress_octal_dtr_enable() in
spi_nor_cypress_octal_dtr_ena() spi_nor_cypress_octal_dtr_dis() as it no
longer made sense to try to keep everything alltogether: too many
"if (enable)" throughout the code, which made the code difficult to read.
Add debug messages in case spi_nor_read_id() fails.
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: Pratyush Yadav <p.yadav@ti.com>
Reviewed-by: Michael Walle <michael@walle.cc>
---
drivers/mtd/spi-nor/spansion.c | 128 ++++++++++++++++++---------------
1 file changed, 69 insertions(+), 59 deletions(-)
diff --git a/drivers/mtd/spi-nor/spansion.c b/drivers/mtd/spi-nor/spansion.c
index c5988312cc91..56b43074ef17 100644
--- a/drivers/mtd/spi-nor/spansion.c
+++ b/drivers/mtd/spi-nor/spansion.c
@@ -23,87 +23,81 @@
#define SPINOR_REG_CYPRESS_CFR5V_OCT_DTR_DS 0
#define SPINOR_OP_CYPRESS_RD_FAST 0xee
-/**
- * cypress_nor_octal_dtr_enable() - Enable octal DTR on Cypress flashes.
- * @nor: pointer to a 'struct spi_nor'
- * @enable: whether to enable or disable Octal DTR
- *
- * This also sets the memory access latency cycles to 24 to allow the flash to
- * run at up to 200MHz.
- *
- * Return: 0 on success, -errno otherwise.
- */
-static int cypress_nor_octal_dtr_enable(struct spi_nor *nor, bool enable)
+/* Cypress SPI NOR flash operations. */
+#define CYPRESS_NOR_WR_ANY_REG_OP(naddr, addr, ndata, buf) \
+ SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_WR_ANY_REG, 0), \
+ SPI_MEM_OP_ADDR(naddr, addr, 0), \
+ SPI_MEM_OP_NO_DUMMY, \
+ SPI_MEM_OP_DATA_OUT(ndata, buf, 0))
+
+static int cypress_nor_octal_dtr_en(struct spi_nor *nor)
{
struct spi_mem_op op;
u8 *buf = nor->bouncebuf;
int ret;
- if (enable) {
- /* Use 24 dummy cycles for memory array reads. */
- ret = spi_nor_write_enable(nor);
- if (ret)
- return ret;
+ /* Use 24 dummy cycles for memory array reads. */
+ *buf = SPINOR_REG_CYPRESS_CFR2V_MEMLAT_11_24;
+ op = (struct spi_mem_op)
+ CYPRESS_NOR_WR_ANY_REG_OP(3, SPINOR_REG_CYPRESS_CFR2V, 1, buf);
- *buf = SPINOR_REG_CYPRESS_CFR2V_MEMLAT_11_24;
- op = (struct spi_mem_op)
- SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_WR_ANY_REG, 1),
- SPI_MEM_OP_ADDR(3, SPINOR_REG_CYPRESS_CFR2V,
- 1),
- SPI_MEM_OP_NO_DUMMY,
- SPI_MEM_OP_DATA_OUT(1, buf, 1));
+ ret = spi_nor_write_any_volatile_reg(nor, &op, nor->reg_proto);
+ if (ret)
+ return ret;
- ret = spi_mem_exec_op(nor->spimem, &op);
- if (ret)
- return ret;
+ ret = spi_nor_wait_till_ready(nor);
+ if (ret)
+ return ret;
- ret = spi_nor_wait_till_ready(nor);
- if (ret)
- return ret;
+ nor->read_dummy = 24;
- nor->read_dummy = 24;
- }
+ /* Set the octal and DTR enable bits. */
+ buf[0] = SPINOR_REG_CYPRESS_CFR5V_OCT_DTR_EN;
+ op = (struct spi_mem_op)
+ CYPRESS_NOR_WR_ANY_REG_OP(3, SPINOR_REG_CYPRESS_CFR5V, 1, buf);
- /* Set/unset the octal and DTR enable bits. */
- ret = spi_nor_write_enable(nor);
+ ret = spi_nor_write_any_volatile_reg(nor, &op, nor->reg_proto);
if (ret)
return ret;
- if (enable) {
- buf[0] = SPINOR_REG_CYPRESS_CFR5V_OCT_DTR_EN;
- } else {
- /*
- * The register is 1-byte wide, but 1-byte transactions are not
- * allowed in 8D-8D-8D mode. Since there is no register at the
- * next location, just initialize the value to 0 and let the
- * transaction go on.
- */
- buf[0] = SPINOR_REG_CYPRESS_CFR5V_OCT_DTR_DS;
- buf[1] = 0;
+ /* Read flash ID to make sure the switch was successful. */
+ ret = spi_nor_read_id(nor, 4, 3, buf, SNOR_PROTO_8_8_8_DTR);
+ if (ret) {
+ dev_dbg(nor->dev, "error %d reading JEDEC ID after enabling 8D-8D-8D mode\n", ret);
+ return ret;
}
- op = (struct spi_mem_op)
- SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_WR_ANY_REG, 1),
- SPI_MEM_OP_ADDR(enable ? 3 : 4,
- SPINOR_REG_CYPRESS_CFR5V,
- 1),
- SPI_MEM_OP_NO_DUMMY,
- SPI_MEM_OP_DATA_OUT(enable ? 1 : 2, buf, 1));
+ if (memcmp(buf, nor->info->id, nor->info->id_len))
+ return -EINVAL;
- if (!enable)
- spi_nor_spimem_setup_op(nor, &op, SNOR_PROTO_8_8_8_DTR);
+ return 0;
+}
- ret = spi_mem_exec_op(nor->spimem, &op);
+static int cypress_nor_octal_dtr_dis(struct spi_nor *nor)
+{
+ struct spi_mem_op op;
+ u8 *buf = nor->bouncebuf;
+ int ret;
+
+ /*
+ * The register is 1-byte wide, but 1-byte transactions are not allowed
+ * in 8D-8D-8D mode. Since there is no register at the next location,
+ * just initialize the value to 0 and let the transaction go on.
+ */
+ buf[0] = SPINOR_REG_CYPRESS_CFR5V_OCT_DTR_DS;
+ buf[1] = 0;
+ op = (struct spi_mem_op)
+ CYPRESS_NOR_WR_ANY_REG_OP(4, SPINOR_REG_CYPRESS_CFR5V, 2, buf);
+ ret = spi_nor_write_any_volatile_reg(nor, &op, SNOR_PROTO_8_8_8_DTR);
if (ret)
return ret;
/* Read flash ID to make sure the switch was successful. */
- if (enable)
- ret = spi_nor_read_id(nor, 4, 3, buf, SNOR_PROTO_8_8_8_DTR);
- else
- ret = spi_nor_read_id(nor, 0, 0, buf, SNOR_PROTO_1_1_1);
- if (ret)
+ ret = spi_nor_read_id(nor, 0, 0, buf, SNOR_PROTO_1_1_1);
+ if (ret) {
+ dev_dbg(nor->dev, "error %d reading JEDEC ID after disabling 8D-8D-8D mode\n", ret);
return ret;
+ }
if (memcmp(buf, nor->info->id, nor->info->id_len))
return -EINVAL;
@@ -111,6 +105,22 @@ static int cypress_nor_octal_dtr_enable(struct spi_nor *nor, bool enable)
return 0;
}
+/**
+ * cypress_nor_octal_dtr_enable() - Enable octal DTR on Cypress flashes.
+ * @nor: pointer to a 'struct spi_nor'
+ * @enable: whether to enable or disable Octal DTR
+ *
+ * This also sets the memory access latency cycles to 24 to allow the flash to
+ * run at up to 200MHz.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
+static int cypress_nor_octal_dtr_enable(struct spi_nor *nor, bool enable)
+{
+ return enable ? cypress_nor_octal_dtr_en(nor) :
+ cypress_nor_octal_dtr_dis(nor);
+}
+
static void s28hs512t_default_init(struct spi_nor *nor)
{
nor->params->octal_dtr_enable = cypress_nor_octal_dtr_enable;
--
2.25.1
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next prev parent reply other threads:[~2022-04-20 10:36 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-20 10:34 [PATCH v4 00/11] mtd: spi-nor: Rework Octal DTR methods Tudor Ambarus
2022-04-20 10:34 ` [PATCH v4 01/11] mtd: spi-nor: Rename method, s/spi_nor_match_id/spi_nor_match_name Tudor Ambarus
2022-04-20 10:34 ` [PATCH v4 02/11] mtd: spi-nor: Introduce spi_nor_match_id() Tudor Ambarus
2022-04-20 10:34 ` [PATCH v4 03/11] mtd: spi-nor: core: Use auto-detection only once Tudor Ambarus
2022-04-21 7:18 ` Tudor.Ambarus
2022-04-21 13:16 ` Pratyush Yadav
2022-04-21 13:41 ` Tudor.Ambarus
2022-04-27 5:20 ` Pratyush Yadav
2022-04-27 7:13 ` Tudor.Ambarus
2022-04-20 10:34 ` [PATCH v4 04/11] mtd: spi-nor: core: Introduce method for RDID op Tudor Ambarus
2022-04-20 10:34 ` [PATCH v4 05/11] mtd: spi-nor: manufacturers: Use spi_nor_read_id() core method Tudor Ambarus
2022-04-20 10:34 ` [PATCH v4 06/11] mtd: spi-nor: core: Add helpers to read/write any register Tudor Ambarus
2022-04-20 10:34 ` [PATCH v4 07/11] mtd: spi-nor: micron-st: Rework spi_nor_micron_octal_dtr_enable() Tudor Ambarus
2022-04-20 10:34 ` Tudor Ambarus [this message]
2022-04-20 10:34 ` [PATCH v4 09/11] mtd: spi-nor: Introduce templates for SPI NOR operations Tudor Ambarus
2022-04-20 10:34 ` [PATCH v4 10/11] mtd: spi-nor: spansion: Remove status polling on volatile registers write Tudor Ambarus
2022-04-20 20:04 ` Michael Walle
2022-04-20 10:34 ` [PATCH v4 11/11] mtd: spi-nor: micron-st: " Tudor Ambarus
2022-04-20 20:05 ` Michael Walle
2022-04-27 9:31 ` [PATCH v4 00/11] mtd: spi-nor: Rework Octal DTR methods Pratyush Yadav
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