Skip to content

L
linux
Commit 5f195ee7 authored by Boris Brezillon's avatar Boris Brezillon Committed by Mark Brown
Browse files
Options

spi: bcm-qspi: Implement the spi_mem interface 

The spi_mem interface is meant to replace the ->spi_flash_read() one.
Implement the ->exec_op() method to ease removal of the old interface.

Not that ->spi_flash_read() is now implemented as a wrapper around the
new bcm_qspi_exec_mem_op() function so that we can easily get rid of
it when ->spi_flash_read() is removed.
Signed-off-by: default avatarBoris Brezillon <boris.brezillon@bootlin.com>
Reviewed-by: default avatarKamal Dasu <kdasu.kdev@gmail.com>
Tested-by: default avatarKamal Dasu <kdasu.kdev@gmail.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent b5932f5c
Hide whitespace changes
Inline Side-by-side
Showing with 111 additions and 79 deletions
drivers/spi/spi-bcm-qspi.c
View file @ 5f195ee7
......@@ -30,6 +30,7 @@
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <linux/spi/spi-mem.h>
#include <linux/sysfs.h>
#include <linux/types.h>
#include "spi-bcm-qspi.h"
......@@ -215,10 +216,10 @@ struct bcm_qspi {
int bspi_maj_rev;
int bspi_min_rev;
int bspi_enabled;
struct spi_flash_read_message *bspi_rf_msg;
u32 bspi_rf_msg_idx;
u32 bspi_rf_msg_len;
u32 bspi_rf_msg_status;
const struct spi_mem_op *bspi_rf_op;
u32 bspi_rf_op_idx;
u32 bspi_rf_op_len;
u32 bspi_rf_op_status;
struct bcm_xfer_mode xfer_mode;
u32 s3_strap_override_ctrl;
bool bspi_mode;
......@@ -313,26 +314,26 @@ static inline void bcm_qspi_bspi_lr_clear(struct bcm_qspi *qspi)
static void bcm_qspi_bspi_lr_data_read(struct bcm_qspi *qspi)
{
u32 *buf = (u32 *)qspi->bspi_rf_msg->buf;
u32 *buf = (u32 *)qspi->bspi_rf_op->data.buf.in;
u32 data = 0;
dev_dbg(&qspi->pdev->dev, "xfer %p rx %p rxlen %d\n", qspi->bspi_rf_msg,
qspi->bspi_rf_msg->buf, qspi->bspi_rf_msg_len);
dev_dbg(&qspi->pdev->dev, "xfer %p rx %p rxlen %d\n", qspi->bspi_rf_op,
qspi->bspi_rf_op->data.buf.in, qspi->bspi_rf_op_len);
while (!bcm_qspi_bspi_lr_is_fifo_empty(qspi)) {
data = bcm_qspi_bspi_lr_read_fifo(qspi);
if (likely(qspi->bspi_rf_msg_len >= 4) &&
if (likely(qspi->bspi_rf_op_len >= 4) &&
IS_ALIGNED((uintptr_t)buf, 4)) {
buf[qspi->bspi_rf_msg_idx++] = data;
qspi->bspi_rf_msg_len -= 4;
buf[qspi->bspi_rf_op_idx++] = data;
qspi->bspi_rf_op_len -= 4;
} else {
/* Read out remaining bytes, make sure*/
u8 *cbuf = (u8 *)&buf[qspi->bspi_rf_msg_idx];
u8 *cbuf = (u8 *)&buf[qspi->bspi_rf_op_idx];
data = cpu_to_le32(data);
while (qspi->bspi_rf_msg_len) {
while (qspi->bspi_rf_op_len) {
*cbuf++ = (u8)data;
data >>= 8;
qspi->bspi_rf_msg_len--;
qspi->bspi_rf_op_len--;
}
}
}
......@@ -349,14 +350,12 @@ static void bcm_qspi_bspi_set_xfer_params(struct bcm_qspi *qspi, u8 cmd_byte,
}
static int bcm_qspi_bspi_set_flex_mode(struct bcm_qspi *qspi,
struct spi_flash_read_message *msg,
int hp)
const struct spi_mem_op *op, int hp)
{
int bpc = 0, bpp = 0;
u8 command = msg->read_opcode;
int width = msg->data_nbits ? msg->data_nbits : SPI_NBITS_SINGLE;
int addrlen = msg->addr_width;
int addr_nbits = msg->addr_nbits ? msg->addr_nbits : SPI_NBITS_SINGLE;
u8 command = op->cmd.opcode;
int width = op->cmd.buswidth ? op->cmd.buswidth : SPI_NBITS_SINGLE;
int addrlen = op->addr.nbytes * 8;
int flex_mode = 1;
dev_dbg(&qspi->pdev->dev, "set flex mode w %x addrlen %x hp %d\n",
......@@ -365,7 +364,7 @@ static int bcm_qspi_bspi_set_flex_mode(struct bcm_qspi *qspi,
if (addrlen == BSPI_ADDRLEN_4BYTES)
bpp = BSPI_BPP_ADDR_SELECT_MASK;
bpp |= msg->dummy_bytes * (8/addr_nbits);
bpp |= (op->dummy.nbytes * 8) / op->dummy.buswidth;
switch (width) {
case SPI_NBITS_SINGLE:
......@@ -397,11 +396,10 @@ static int bcm_qspi_bspi_set_flex_mode(struct bcm_qspi *qspi,
}
static int bcm_qspi_bspi_set_override(struct bcm_qspi *qspi,
struct spi_flash_read_message *msg,
int hp)
const struct spi_mem_op *op, int hp)
{
int width = msg->data_nbits ? msg->data_nbits : SPI_NBITS_SINGLE;
int addrlen = msg->addr_width;
int width = op->data.buswidth ? op->data.buswidth : SPI_NBITS_SINGLE;
int addrlen = op->addr.nbytes;
u32 data = bcm_qspi_read(qspi, BSPI, BSPI_STRAP_OVERRIDE_CTRL);
dev_dbg(&qspi->pdev->dev, "set override mode w %x addrlen %x hp %d\n",
......@@ -437,17 +435,17 @@ static int bcm_qspi_bspi_set_override(struct bcm_qspi *qspi,
/* set the override mode */
data |= BSPI_STRAP_OVERRIDE_CTRL_OVERRIDE;
bcm_qspi_write(qspi, BSPI, BSPI_STRAP_OVERRIDE_CTRL, data);
bcm_qspi_bspi_set_xfer_params(qspi, msg->read_opcode, 0, 0, 0);
bcm_qspi_bspi_set_xfer_params(qspi, op->cmd.opcode, 0, 0, 0);
return 0;
}
static int bcm_qspi_bspi_set_mode(struct bcm_qspi *qspi,
struct spi_flash_read_message *msg, int hp)
const struct spi_mem_op *op, int hp)
{
int error = 0;
int width = msg->data_nbits ? msg->data_nbits : SPI_NBITS_SINGLE;
int addrlen = msg->addr_width;
int width = op->data.buswidth ? op->data.buswidth : SPI_NBITS_SINGLE;
int addrlen = op->addr.nbytes;
/* default mode */
qspi->xfer_mode.flex_mode = true;
......@@ -460,12 +458,12 @@ static int bcm_qspi_bspi_set_mode(struct bcm_qspi *qspi,
if (val & mask || qspi->s3_strap_override_ctrl & mask) {
qspi->xfer_mode.flex_mode = false;
bcm_qspi_write(qspi, BSPI, BSPI_FLEX_MODE_ENABLE, 0);
error = bcm_qspi_bspi_set_override(qspi, msg, hp);
error = bcm_qspi_bspi_set_override(qspi, op, hp);
}
}
if (qspi->xfer_mode.flex_mode)
error = bcm_qspi_bspi_set_flex_mode(qspi, msg, hp);
error = bcm_qspi_bspi_set_flex_mode(qspi, op, hp);
if (error) {
dev_warn(&qspi->pdev->dev,
......@@ -794,19 +792,20 @@ static int write_to_hw(struct bcm_qspi *qspi, struct spi_device *spi)
return slot;
}
static int bcm_qspi_bspi_flash_read(struct spi_device *spi,
struct spi_flash_read_message *msg)
static int bcm_qspi_bspi_exec_mem_op(struct spi_device *spi,
const struct spi_mem_op *op)
{
struct bcm_qspi *qspi = spi_master_get_devdata(spi->master);
u32 addr = 0, len, rdlen, len_words;
u32 addr = 0, len, rdlen, len_words, from = 0;
int ret = 0;
unsigned long timeo = msecs_to_jiffies(100);
struct bcm_qspi_soc_intc *soc_intc = qspi->soc_intc;
if (bcm_qspi_bspi_ver_three(qspi))
if (msg->addr_width == BSPI_ADDRLEN_4BYTES)
if (op->addr.nbytes == BSPI_ADDRLEN_4BYTES)
return -EIO;
from = op->addr.val;
bcm_qspi_chip_select(qspi, spi->chip_select);
bcm_qspi_write(qspi, MSPI, MSPI_WRITE_LOCK, 0);
......@@ -815,15 +814,15 @@ static int bcm_qspi_bspi_flash_read(struct spi_device *spi,
* the upper address byte to bspi
*/
if (bcm_qspi_bspi_ver_three(qspi) == false) {
addr = msg->from & 0xff000000;
addr = from & 0xff000000;
bcm_qspi_write(qspi, BSPI,
BSPI_BSPI_FLASH_UPPER_ADDR_BYTE, addr);
}
if (!qspi->xfer_mode.flex_mode)
addr = msg->from;
addr = from;
else
addr = msg->from & 0x00ffffff;
addr = from & 0x00ffffff;
if (bcm_qspi_bspi_ver_three(qspi) == true)
addr = (addr + 0xc00000) & 0xffffff;
......@@ -832,8 +831,8 @@ static int bcm_qspi_bspi_flash_read(struct spi_device *spi,
* read into the entire buffer by breaking the reads
* into RAF buffer read lengths
*/
len = msg->len;
qspi->bspi_rf_msg_idx = 0;
len = op->data.nbytes;
qspi->bspi_rf_op_idx = 0;
do {
if (len > BSPI_READ_LENGTH)
......@@ -844,9 +843,9 @@ static int bcm_qspi_bspi_flash_read(struct spi_device *spi,
reinit_completion(&qspi->bspi_done);
bcm_qspi_enable_bspi(qspi);
len_words = (rdlen + 3) >> 2;
qspi->bspi_rf_msg = msg;
qspi->bspi_rf_msg_status = 0;
qspi->bspi_rf_msg_len = rdlen;
qspi->bspi_rf_op = op;
qspi->bspi_rf_op_status = 0;
qspi->bspi_rf_op_len = rdlen;
dev_dbg(&qspi->pdev->dev,
"bspi xfr addr 0x%x len 0x%x", addr, rdlen);
bcm_qspi_write(qspi, BSPI, BSPI_RAF_START_ADDR, addr);
......@@ -871,7 +870,6 @@ static int bcm_qspi_bspi_flash_read(struct spi_device *spi,
}
/* set msg return length */
msg->retlen += rdlen;
addr += rdlen;
len -= rdlen;
} while (len);
......@@ -906,61 +904,62 @@ static int bcm_qspi_transfer_one(struct spi_master *master,
return 0;
}
static int bcm_qspi_mspi_flash_read(struct spi_device *spi,
struct spi_flash_read_message *msg)
static int bcm_qspi_mspi_exec_mem_op(struct spi_device *spi,
const struct spi_mem_op *op)
{
struct bcm_qspi *qspi = spi_master_get_devdata(spi->master);
struct spi_master *master = spi->master;
struct bcm_qspi *qspi = spi_master_get_devdata(master);
struct spi_transfer t[2];
u8 cmd[6];
int ret;
u8 cmd[6] = { };
int ret, i;
memset(cmd, 0, sizeof(cmd));
memset(t, 0, sizeof(t));
/* tx */
/* opcode is in cmd[0] */
cmd[0] = msg->read_opcode;
cmd[1] = msg->from >> (msg->addr_width * 8 - 8);
cmd[2] = msg->from >> (msg->addr_width * 8 - 16);
cmd[3] = msg->from >> (msg->addr_width * 8 - 24);
cmd[4] = msg->from >> (msg->addr_width * 8 - 32);
cmd[0] = op->cmd.opcode;
for (i = 0; i < op->addr.nbytes; i++)
cmd[1 + i] = op->addr.val >> (8 * (op->addr.nbytes - i - 1));
t[0].tx_buf = cmd;
t[0].len = msg->addr_width + msg->dummy_bytes + 1;
t[0].len = op->addr.nbytes + op->dummy.nbytes + 1;
t[0].bits_per_word = spi->bits_per_word;
t[0].tx_nbits = msg->opcode_nbits;
t[0].tx_nbits = op->cmd.buswidth;
/* lets mspi know that this is not last transfer */
qspi->trans_pos.mspi_last_trans = false;
ret = bcm_qspi_transfer_one(spi->master, spi, &t[0]);
ret = bcm_qspi_transfer_one(master, spi, &t[0]);
/* rx */
qspi->trans_pos.mspi_last_trans = true;
if (!ret) {
/* rx */
t[1].rx_buf = msg->buf;
t[1].len = msg->len;
t[1].rx_nbits = msg->data_nbits;
t[1].rx_buf = op->data.buf.in;
t[1].len = op->data.nbytes;
t[1].rx_nbits = op->data.buswidth;
t[1].bits_per_word = spi->bits_per_word;
ret = bcm_qspi_transfer_one(spi->master, spi, &t[1]);
ret = bcm_qspi_transfer_one(master, spi, &t[1]);
}
if (!ret)
msg->retlen = msg->len;
return ret;
}
static int bcm_qspi_flash_read(struct spi_device *spi,
struct spi_flash_read_message *msg)
static int bcm_qspi_exec_mem_op(struct spi_device *spi,
const struct spi_mem_op *op)
{
struct bcm_qspi *qspi = spi_master_get_devdata(spi->master);
int ret = 0;
bool mspi_read = false;
u32 addr, len;
u32 addr = 0, len;
u_char *buf;
buf = msg->buf;
addr = msg->from;
len = msg->len;
if (!op->data.nbytes || !op->addr.nbytes || op->addr.nbytes > 4 ||
op->data.dir != SPI_MEM_DATA_IN)
return -ENOTSUPP;
buf = op->data.buf.in;
addr = op->addr.val;
len = op->data.nbytes;
if (bcm_qspi_bspi_ver_three(qspi) == true) {
/*
......@@ -982,12 +981,40 @@ static int bcm_qspi_flash_read(struct spi_device *spi,
mspi_read = true;
if (mspi_read)
return bcm_qspi_mspi_flash_read(spi, msg);
return bcm_qspi_mspi_exec_mem_op(spi, op);
ret = bcm_qspi_bspi_set_mode(qspi, msg, -1);
ret = bcm_qspi_bspi_set_mode(qspi, op, -1);
if (!ret)
ret = bcm_qspi_bspi_flash_read(spi, msg);
ret = bcm_qspi_bspi_exec_mem_op(spi, op);
return ret;
}
static int bcm_qspi_exec_mem_op_wrapper(struct spi_mem *mem,
const struct spi_mem_op *op)
{
return bcm_qspi_exec_mem_op(mem->spi, op);
}
static int bcm_qspi_flash_read_wrapper(struct spi_device *spi,
struct spi_flash_read_message *msg)
{
int ret;
struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(msg->read_opcode, 1),
SPI_MEM_OP_ADDR(msg->addr_width,
msg->from,
msg->addr_nbits),
SPI_MEM_OP_DUMMY(msg->dummy_bytes,
msg->addr_nbits),
SPI_MEM_OP_DATA_IN(msg->len,
msg->buf,
msg->data_nbits));
msg->retlen = 0;
ret = bcm_qspi_exec_mem_op(spi, &op);
if (!ret)
msg->retlen = msg->len;
return ret;
}
......@@ -1026,10 +1053,10 @@ static irqreturn_t bcm_qspi_bspi_lr_l2_isr(int irq, void *dev_id)
struct bcm_qspi_soc_intc *soc_intc = qspi->soc_intc;
u32 status = qspi_dev_id->irqp->mask;
if (qspi->bspi_enabled && qspi->bspi_rf_msg) {
if (qspi->bspi_enabled && qspi->bspi_rf_op) {
bcm_qspi_bspi_lr_data_read(qspi);
if (qspi->bspi_rf_msg_len == 0) {
qspi->bspi_rf_msg = NULL;
if (qspi->bspi_rf_op_len == 0) {
qspi->bspi_rf_op = NULL;
if (qspi->soc_intc) {
/* disable soc BSPI interrupt */
soc_intc->bcm_qspi_int_set(soc_intc, BSPI_DONE,
......@@ -1038,7 +1065,7 @@ static irqreturn_t bcm_qspi_bspi_lr_l2_isr(int irq, void *dev_id)
status = INTR_BSPI_LR_SESSION_DONE_MASK;
}
if (qspi->bspi_rf_msg_status)
if (qspi->bspi_rf_op_status)
bcm_qspi_bspi_lr_clear(qspi);
else
bcm_qspi_bspi_flush_prefetch_buffers(qspi);
......@@ -1050,7 +1077,7 @@ static irqreturn_t bcm_qspi_bspi_lr_l2_isr(int irq, void *dev_id)
}
status &= INTR_BSPI_LR_SESSION_DONE_MASK;
if (qspi->bspi_enabled && status && qspi->bspi_rf_msg_len == 0)
if (qspi->bspi_enabled && status && qspi->bspi_rf_op_len == 0)
complete(&qspi->bspi_done);
return IRQ_HANDLED;
......@@ -1063,7 +1090,7 @@ static irqreturn_t bcm_qspi_bspi_lr_err_l2_isr(int irq, void *dev_id)
struct bcm_qspi_soc_intc *soc_intc = qspi->soc_intc;
dev_err(&qspi->pdev->dev, "BSPI INT error\n");
qspi->bspi_rf_msg_status = -EIO;
qspi->bspi_rf_op_status = -EIO;
if (qspi->soc_intc)
/* clear soc interrupt */
soc_intc->bcm_qspi_int_ack(soc_intc, BSPI_ERR);
......@@ -1186,6 +1213,10 @@ static void bcm_qspi_hw_uninit(struct bcm_qspi *qspi)
}
static const struct spi_controller_mem_ops bcm_qspi_mem_ops = {
.exec_op = bcm_qspi_exec_mem_op_wrapper,
};
static const struct of_device_id bcm_qspi_of_match[] = {
{ .compatible = "brcm,spi-bcm-qspi" },
{},
......@@ -1228,7 +1259,8 @@ int bcm_qspi_probe(struct platform_device *pdev,
master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_RX_DUAL | SPI_RX_QUAD;
master->setup = bcm_qspi_setup;
master->transfer_one = bcm_qspi_transfer_one;
master->spi_flash_read = bcm_qspi_flash_read;
master->spi_flash_read = bcm_qspi_flash_read_wrapper;
master->mem_ops = &bcm_qspi_mem_ops;
master->cleanup = bcm_qspi_cleanup;
master->dev.of_node = dev->of_node;
master->num_chipselect = NUM_CHIPSELECT;
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7