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realtek: add serdes mapping for rtl930x

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On the RTL930x series the serdes #3 is backed by serdes #10 when pages
0, 1, 2 or 3 are accessed [1]. This changeset modifies the sds mapping
function from a single implementation for the 3 families to one
implementation per chip family. In particular it implements the mapping
required for the rtl930x one.

[1] https://github.com/ddejean/dms-1250-oss-release/blob/main/sdk/sdk_rtk_switch/rtk-sdk/src/dal/longan/dal_longan_sds.c#L624

Signed-off-by: Damien Dejean <dam.dejean@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/20472
Signed-off-by: Robert Marko <robimarko@gmail.com>
This commit is contained in:
Damien Dejean
2025-10-18 17:01:24 +02:00
committed by Robert Marko
parent 93f86627c4
commit d76b97bd71
1 changed files with 76 additions and 58 deletions
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134
target/linux/realtek/files-6.12/drivers/net/mdio/mdio-realtek-otto-serdes.c
View File

@ -52,6 +52,7 @@ struct rtsds_config {
int sds_cnt;
int page_cnt;
int base;
int (*get_backing_sds)(struct rtsds_ctrl *ctrl, int sds, int page);
int (*read)(struct rtsds_ctrl *ctrl, int sds, int page, int regnum);
int (*write)(struct rtsds_ctrl *ctrl, int sds, int page, int regnum, u16 value);
};
@ -68,24 +69,6 @@ static bool rtsds_mmd_to_sds(struct rtsds_ctrl *ctrl, int addr, int devad, int m
devad != MDIO_MMD_VEND1);
}
static int rtsds_get_backing_sds(struct rtsds_ctrl *ctrl, int sds, int page)
{
int map[] = { 0, 1, 2, 3, 6, 7, 10, 11, 14, 15, 18, 19, 22, 23 };
int backsds;
/* non-RTL931x and first two RTL931x SerDes have 1:1 frontend/backend mapping */
if (ctrl->cfg->base != RTSDS_931X_BASE || sds < 2)
return sds;
backsds = map[sds];
if (sds & 1)
backsds += (page >> 6); /* distribute "odd" to 3 background SerDes */
else
backsds += (page >> 7); /* distribute "even" to 2 background SerDes */
return backsds;
}
#ifdef CONFIG_DEBUG_FS
/*
@ -137,7 +120,7 @@ static int rtsds_dbg_registers_show(struct seq_file *seqf, void *unused)
do {
subpage = RTSDS_SUBPAGE(page);
if (!subpage) {
seq_printf(seqf, "Back SDS %02d:", rtsds_get_backing_sds(ctrl, sds, page));
seq_printf(seqf, "Back SDS %02d:", ctrl->cfg->get_backing_sds(ctrl, sds, page));
for (regnum = 0; regnum < RTSDS_REG_CNT; regnum++)
seq_printf(seqf, " %02X", regnum);
seq_puts(seqf, "\n");
@ -302,6 +285,32 @@ static int rtsds_839x_write(struct rtsds_ctrl *ctrl, int sds, int page, int regn
return regmap_write(ctrl->map, ctrl->cfg->base + offset, write_value);
}
static int rtsds_83xx_get_backing_sds(struct rtsds_ctrl *ctrl, int sds, int page)
{
return sds;
}
static int rtsds_rt93xx_io(struct rtsds_ctrl *ctrl, int sds, int page, int regnum, int cmd)
{
int ret, op, value;
op = FIELD_PREP(RTSDS_93XX_CMD_SDS_MASK, sds) |
FIELD_PREP(RTSDS_93XX_CMD_PAGE_MASK, page) |
FIELD_PREP(RTSDS_93XX_CMD_REG_MASK, regnum) |
RTSDS_93XX_CMD_BUSY | cmd;
regmap_write(ctrl->map, ctrl->cfg->base, op);
ret = regmap_read_poll_timeout(ctrl->map, ctrl->cfg->base, value,
!(value & RTSDS_93XX_CMD_BUSY), 30, 1000000);
if (ret < 0) {
dev_err(ctrl->dev, "SerDes I/O timed out\n");
return -ETIMEDOUT;
}
return 0;
}
/*
* RTL93xx targets use a shared implementation. Their SerDes data is accessed through two IO
* registers which simulate commands to an internal MDIO bus.
@ -311,7 +320,16 @@ static int rtsds_839x_write(struct rtsds_ctrl *ctrl, int sds, int page, int regn
* - SerDes 0-1 exist on the RTL9301 and 9302B and are QSGMII capable
* - SerDes 2-9 are USXGMII capabable with either quad or single configuration
* - SerDes 10-11 are 10GBase-R capable
*
*/
static int rtsds_930x_get_backing_sds(struct rtsds_ctrl *ctrl, int sds, int page)
{
if (sds == 3 && page < 4)
return 10;
return sds;
}
/*
* The RTL931x family has 14 "frontend" SerDes that are cascaded. All operations (e.g. reset) work
* on this frontend view while their registers are distributed over a total of least 26 background
* SerDes with 64 pages and 32 registers. Three types of SerDes exist:
@ -342,26 +360,22 @@ static int rtsds_839x_write(struct rtsds_ctrl *ctrl, int sds, int page, int regn
* page 0x40-0x7f (digi 1): page 0x00-0x3f back SDS page 0x00-0x3f back SDS+1
* page 0x80-0xbf (digi 2): page 0x00-0x3f back SDS+1 page 0x00-0x3f back SDS+2
*/
static int rtsds_rt93xx_io(struct rtsds_ctrl *ctrl, int sds, int page, int regnum, int cmd)
static int rtsds_931x_get_backing_sds(struct rtsds_ctrl *ctrl, int sds, int page)
{
int ret, op, value;
int map[] = { 0, 1, 2, 3, 6, 7, 10, 11, 14, 15, 18, 19, 22, 23 };
int backsds;
op = FIELD_PREP(RTSDS_93XX_CMD_SDS_MASK, sds) |
FIELD_PREP(RTSDS_93XX_CMD_PAGE_MASK, page) |
FIELD_PREP(RTSDS_93XX_CMD_REG_MASK, regnum) |
RTSDS_93XX_CMD_BUSY | cmd;
/* First two RTL931x SerDes have 1:1 frontend/backend mapping */
if (sds < 2)
return sds;
regmap_write(ctrl->map, ctrl->cfg->base, op);
ret = regmap_read_poll_timeout(ctrl->map, ctrl->cfg->base, value,
!(value & RTSDS_93XX_CMD_BUSY), 30, 1000000);
backsds = map[sds];
if (sds & 1)
backsds += (page >> 6); /* distribute "odd" to 3 background SerDes */
else
backsds += (page >> 7); /* distribute "even" to 2 background SerDes */
if (ret < 0) {
dev_err(ctrl->dev, "SerDes I/O timed out\n");
return -ETIMEDOUT;
}
return 0;
return backsds;
}
static int rtsds_93xx_read(struct rtsds_ctrl *ctrl, int sds, int page, int regnum)
@ -369,7 +383,7 @@ static int rtsds_93xx_read(struct rtsds_ctrl *ctrl, int sds, int page, int regnu
int subpage = RTSDS_SUBPAGE(page);
int ret, backsds, value;
backsds = rtsds_get_backing_sds(ctrl, sds, page);
backsds = ctrl->cfg->get_backing_sds(ctrl, sds, page);
ret = rtsds_rt93xx_io(ctrl, backsds, subpage, regnum, RTSDS_93XX_CMD_READ);
if (ret)
return ret;
@ -384,7 +398,7 @@ static int rtsds_93xx_write(struct rtsds_ctrl *ctrl, int sds, int page, int regn
int subpage = RTSDS_SUBPAGE(page);
int ret, backsds;
backsds = rtsds_get_backing_sds(ctrl, sds, page);
backsds = ctrl->cfg->get_backing_sds(ctrl, sds, page);
ret = regmap_write(ctrl->map, ctrl->cfg->base + 4, value);
if (ret)
return ret;
@ -458,35 +472,39 @@ static int rtsds_probe(struct platform_device *pdev)
}
static const struct rtsds_config rtsds_838x_cfg = {
.sds_cnt = RTSDS_838X_SDS_CNT,
.page_cnt = RTSDS_838X_PAGE_CNT,
.base = RTSDS_838X_BASE,
.read = rtsds_838x_read,
.write = rtsds_838x_write,
.sds_cnt = RTSDS_838X_SDS_CNT,
.page_cnt = RTSDS_838X_PAGE_CNT,
.base = RTSDS_838X_BASE,
.get_backing_sds = rtsds_83xx_get_backing_sds,
.read = rtsds_838x_read,
.write = rtsds_838x_write,
};
static const struct rtsds_config rtsds_839x_cfg = {
.sds_cnt = RTSDS_839X_SDS_CNT,
.page_cnt = RTSDS_839X_PAGE_CNT,
.base = RTSDS_839X_BASE,
.read = rtsds_839x_read,
.write = rtsds_839x_write,
.sds_cnt = RTSDS_839X_SDS_CNT,
.page_cnt = RTSDS_839X_PAGE_CNT,
.base = RTSDS_839X_BASE,
.get_backing_sds = rtsds_83xx_get_backing_sds,
.read = rtsds_839x_read,
.write = rtsds_839x_write,
};
static const struct rtsds_config rtsds_930x_cfg = {
.sds_cnt = RTSDS_930X_SDS_CNT,
.page_cnt = RTSDS_930X_PAGE_CNT,
.base = RTSDS_930X_BASE,
.read = rtsds_93xx_read,
.write = rtsds_93xx_write,
.sds_cnt = RTSDS_930X_SDS_CNT,
.page_cnt = RTSDS_930X_PAGE_CNT,
.base = RTSDS_930X_BASE,
.get_backing_sds = rtsds_930x_get_backing_sds,
.read = rtsds_93xx_read,
.write = rtsds_93xx_write,
};
static const struct rtsds_config rtsds_931x_cfg = {
.sds_cnt = RTSDS_931X_SDS_CNT,
.page_cnt = RTSDS_931X_PAGE_CNT,
.base = RTSDS_931X_BASE,
.read = rtsds_93xx_read,
.write = rtsds_93xx_write,
.sds_cnt = RTSDS_931X_SDS_CNT,
.page_cnt = RTSDS_931X_PAGE_CNT,
.base = RTSDS_931X_BASE,
.get_backing_sds = rtsds_931x_get_backing_sds,
.read = rtsds_93xx_read,
.write = rtsds_93xx_write,
};
static const struct of_device_id rtsds_of_match[] = {