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spi: stm32-qspi: Add dirmap support 

Add stm32_qspi_dirmap_read() and stm32_qspi_dirmap_create()
to get dirmap support.

Update the exec_op callback which doens't allow anymore memory map
access. Memory map access are only available through the dirmap_read
callback.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Link: https://lore.kernel.org/r/20210419121541.11617-4-patrice.chotard@foss.st.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Patrice Chotard 2021-04-19 14:15:41 +02:00 committed by Mark Brown
parent f3530f26f8
commit 18674dee3c
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 67 additions and 16 deletions
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81
drivers/spi/spi-stm32-qspi.c
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@ -331,7 +331,7 @@ static int stm32_qspi_send(struct spi_mem *mem, const struct spi_mem_op *op)
{
struct stm32_qspi *qspi = spi_controller_get_devdata(mem->spi->master);
struct stm32_qspi_flash *flash = &qspi->flash[mem->spi->chip_select];
u32 ccr, cr, addr_max;
u32 ccr, cr;
int timeout, err = 0;
dev_dbg(qspi->dev, "cmd:%#x mode:%d.%d.%d.%d addr:%#llx len:%#x\n",
@ -343,18 +343,6 @@ static int stm32_qspi_send(struct spi_mem *mem, const struct spi_mem_op *op)
if (err)
goto abort;
addr_max = op->addr.val + op->data.nbytes + 1;
if (op->data.dir == SPI_MEM_DATA_IN) {
if (addr_max < qspi->mm_size &&
op->addr.buswidth)
qspi->fmode = CCR_FMODE_MM;
else
qspi->fmode = CCR_FMODE_INDR;
} else {
qspi->fmode = CCR_FMODE_INDW;
}
cr = readl_relaxed(qspi->io_base + QSPI_CR);
cr &= ~CR_PRESC_MASK & ~CR_FSEL;
cr |= FIELD_PREP(CR_PRESC_MASK, flash->presc);
@ -364,8 +352,6 @@ static int stm32_qspi_send(struct spi_mem *mem, const struct spi_mem_op *op)
if (op->data.nbytes)
writel_relaxed(op->data.nbytes - 1,
qspi->io_base + QSPI_DLR);
else
qspi->fmode = CCR_FMODE_INDW;
ccr = qspi->fmode;
ccr |= FIELD_PREP(CCR_INST_MASK, op->cmd.opcode);
@ -441,6 +427,11 @@ static int stm32_qspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
}
mutex_lock(&qspi->lock);
if (op->data.dir == SPI_MEM_DATA_IN && op->data.nbytes)
qspi->fmode = CCR_FMODE_INDR;
else
qspi->fmode = CCR_FMODE_INDW;
ret = stm32_qspi_send(mem, op);
mutex_unlock(&qspi->lock);
@ -450,6 +441,64 @@ static int stm32_qspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
return ret;
}
static int stm32_qspi_dirmap_create(struct spi_mem_dirmap_desc *desc)
{
struct stm32_qspi *qspi = spi_controller_get_devdata(desc->mem->spi->master);
if (desc->info.op_tmpl.data.dir == SPI_MEM_DATA_OUT)
return -EOPNOTSUPP;
/* should never happen, as mm_base == null is an error probe exit condition */
if (!qspi->mm_base && desc->info.op_tmpl.data.dir == SPI_MEM_DATA_IN)
return -EOPNOTSUPP;
if (!qspi->mm_size)
return -EOPNOTSUPP;
return 0;
}
static ssize_t stm32_qspi_dirmap_read(struct spi_mem_dirmap_desc *desc,
u64 offs, size_t len, void *buf)
{
struct stm32_qspi *qspi = spi_controller_get_devdata(desc->mem->spi->master);
struct spi_mem_op op;
u32 addr_max;
int ret;
ret = pm_runtime_get_sync(qspi->dev);
if (ret < 0) {
pm_runtime_put_noidle(qspi->dev);
return ret;
}
mutex_lock(&qspi->lock);
/* make a local copy of desc op_tmpl and complete dirmap rdesc
* spi_mem_op template with offs, len and *buf in order to get
* all needed transfer information into struct spi_mem_op
*/
memcpy(&op, &desc->info.op_tmpl, sizeof(struct spi_mem_op));
dev_dbg(qspi->dev, "%s len = 0x%x offs = 0x%llx buf = 0x%p\n", __func__, len, offs, buf);
op.data.nbytes = len;
op.addr.val = desc->info.offset + offs;
op.data.buf.in = buf;
addr_max = op.addr.val + op.data.nbytes + 1;
if (addr_max < qspi->mm_size && op.addr.buswidth)
qspi->fmode = CCR_FMODE_MM;
else
qspi->fmode = CCR_FMODE_INDR;
ret = stm32_qspi_send(desc->mem, &op);
mutex_unlock(&qspi->lock);
pm_runtime_mark_last_busy(qspi->dev);
pm_runtime_put_autosuspend(qspi->dev);
return ret ?: len;
}
static int stm32_qspi_setup(struct spi_device *spi)
{
struct spi_controller *ctrl = spi->master;
@ -556,6 +605,8 @@ static void stm32_qspi_dma_free(struct stm32_qspi *qspi)
*/
static const struct spi_controller_mem_ops stm32_qspi_mem_ops = {
.exec_op = stm32_qspi_exec_op,
.dirmap_create = stm32_qspi_dirmap_create,
.dirmap_read = stm32_qspi_dirmap_read,
};
static int stm32_qspi_probe(struct platform_device *pdev)