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phy: cadence-torrent: Add wrapper for DPTX register access 

Add wrapper functions to read, write DisplayPort specific PHY registers to
improve code readability.

Signed-off-by: Swapnil Jakhade <sjakhade@cadence.com>
Signed-off-by: Yuti Amonkar <yamonkar@cadence.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
This commit is contained in:
Swapnil Jakhade 2020-02-06 07:10:54 +01:00 committed by Kishon Vijay Abraham I
parent ccb1b89de3
commit f61b3aed20
1 changed files with 50 additions and 21 deletions
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71
drivers/phy/cadence/phy-cadence-torrent.c
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@ -140,13 +140,31 @@ static void cdns_torrent_phy_write(struct cdns_torrent_phy *cdns_phy,
writel(val, cdns_phy->sd_base + offset);
}
/* DPTX mmr access functions */
static void cdns_torrent_dp_write(struct cdns_torrent_phy *cdns_phy,
u32 offset, u32 val)
{
writel(val, cdns_phy->base + offset);
}
static u32 cdns_torrent_dp_read(struct cdns_torrent_phy *cdns_phy, u32 offset)
{
return readl(cdns_phy->base + offset);
}
#define cdns_torrent_dp_read_poll_timeout(cdns_phy, offset, val, cond, \
delay_us, timeout_us) \
readl_poll_timeout((cdns_phy)->base + (offset), \
val, cond, delay_us, timeout_us)
static int cdns_torrent_dp_init(struct phy *phy)
{
unsigned char lane_bits;
struct cdns_torrent_phy *cdns_phy = phy_get_drvdata(phy);
writel(0x0003, cdns_phy->base + PHY_AUX_CTRL); /* enable AUX */
cdns_torrent_dp_write(cdns_phy, PHY_AUX_CTRL, 0x0003); /* enable AUX */
/* PHY PMA registers configuration function */
cdns_torrent_dp_pma_cfg(cdns_phy);
@ -195,11 +213,11 @@ static int cdns_torrent_dp_init(struct phy *phy)
* used lanes
*/
lane_bits = (1 << cdns_phy->num_lanes) - 1;
writel(((0xF & ~lane_bits) << 4) | (0xF & lane_bits),
cdns_phy->base + PHY_RESET);
cdns_torrent_dp_write(cdns_phy, PHY_RESET,
((0xF & ~lane_bits) << 4) | (0xF & lane_bits));
/* release pma_xcvr_pllclk_en_ln_*, only for the master lane */
writel(0x0001, cdns_phy->base + PHY_PMA_XCVR_PLLCLK_EN);
cdns_torrent_dp_write(cdns_phy, PHY_PMA_XCVR_PLLCLK_EN, 0x0001);
/* PHY PMA registers configuration functions */
cdns_torrent_dp_pma_cmn_vco_cfg_25mhz(cdns_phy);
@ -219,8 +237,8 @@ void cdns_torrent_dp_wait_pma_cmn_ready(struct cdns_torrent_phy *cdns_phy)
unsigned int reg;
int ret;
ret = readl_poll_timeout(cdns_phy->base + PHY_PMA_CMN_READY, reg,
reg & 1, 0, 500);
ret = cdns_torrent_dp_read_poll_timeout(cdns_phy, PHY_PMA_CMN_READY,
reg, reg & 1, 0, 500);
if (ret == -ETIMEDOUT)
dev_err(cdns_phy->dev,
"timeout waiting for PMA common ready\n");
@ -391,8 +409,10 @@ static void cdns_torrent_dp_run(struct cdns_torrent_phy *cdns_phy)
* waiting for ACK of pma_xcvr_pllclk_en_ln_*, only for the
* master lane
*/
ret = readl_poll_timeout(cdns_phy->base + PHY_PMA_XCVR_PLLCLK_EN_ACK,
read_val, read_val & 1, 0, POLL_TIMEOUT_US);
ret = cdns_torrent_dp_read_poll_timeout(cdns_phy,
PHY_PMA_XCVR_PLLCLK_EN_ACK,
read_val, read_val & 1, 0,
POLL_TIMEOUT_US);
if (ret == -ETIMEDOUT)
dev_err(cdns_phy->dev,
"timeout waiting for link PLL clock enable ack\n");
@ -417,28 +437,35 @@ static void cdns_torrent_dp_run(struct cdns_torrent_phy *cdns_phy)
break;
}
writel(write_val1, cdns_phy->base + PHY_PMA_XCVR_POWER_STATE_REQ);
cdns_torrent_dp_write(cdns_phy,
PHY_PMA_XCVR_POWER_STATE_REQ, write_val1);
ret = cdns_torrent_dp_read_poll_timeout(cdns_phy,
PHY_PMA_XCVR_POWER_STATE_ACK,
read_val,
(read_val & mask) == write_val1,
0, POLL_TIMEOUT_US);
ret = readl_poll_timeout(cdns_phy->base + PHY_PMA_XCVR_POWER_STATE_ACK,
read_val, (read_val & mask) == write_val1, 0,
POLL_TIMEOUT_US);
if (ret == -ETIMEDOUT)
dev_err(cdns_phy->dev,
"timeout waiting for link power state ack\n");
writel(0, cdns_phy->base + PHY_PMA_XCVR_POWER_STATE_REQ);
cdns_torrent_dp_write(cdns_phy, PHY_PMA_XCVR_POWER_STATE_REQ, 0);
ndelay(100);
writel(write_val2, cdns_phy->base + PHY_PMA_XCVR_POWER_STATE_REQ);
cdns_torrent_dp_write(cdns_phy,
PHY_PMA_XCVR_POWER_STATE_REQ, write_val2);
ret = readl_poll_timeout(cdns_phy->base + PHY_PMA_XCVR_POWER_STATE_ACK,
read_val, (read_val & mask) == write_val2, 0,
POLL_TIMEOUT_US);
ret = cdns_torrent_dp_read_poll_timeout(cdns_phy,
PHY_PMA_XCVR_POWER_STATE_ACK,
read_val,
(read_val & mask) == write_val2,
0, POLL_TIMEOUT_US);
if (ret == -ETIMEDOUT)
dev_err(cdns_phy->dev,
"timeout waiting for link power state ack\n");
writel(0, cdns_phy->base + PHY_PMA_XCVR_POWER_STATE_REQ);
cdns_torrent_dp_write(cdns_phy, PHY_PMA_XCVR_POWER_STATE_REQ, 0);
ndelay(100);
}
@ -450,9 +477,11 @@ static void cdns_dp_phy_write_field(struct cdns_torrent_phy *cdns_phy,
{
unsigned int read_val;
read_val = readl(cdns_phy->base + offset);
writel(((val << start_bit) | (read_val & ~(((1 << num_bits) - 1) <<
start_bit))), cdns_phy->base + offset);
read_val = cdns_torrent_dp_read(cdns_phy, offset);
cdns_torrent_dp_write(cdns_phy, offset,
((val << start_bit) |
(read_val & ~(((1 << num_bits) - 1) <<
start_bit))));
}
static int cdns_torrent_phy_probe(struct platform_device *pdev)