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net: ethernet: arc: Keep emac compatibility for more Rockchip SoCs 

On the RK3066/RK3188, there was fixed GRF offset configuration to set emac
and fixed DIV2 mac TX/RX clock. So, we need to easily set and fit to other
SoCs (RK3036) which maybe have different GRF offset, and need adjust mac
TX/RX clock.

Signed-off-by: Xing Zheng <zhengxing@rock-chips.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xing Zheng 2016-01-08 09:35:01 +08:00 committed by David S. Miller
parent c9bca2fe3c
commit f4c9d3ee03
1 changed files with 45 additions and 24 deletions
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69
drivers/net/ethernet/arc/emac_rockchip.c
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@ -25,17 +25,13 @@
#include "emac.h"
#define DRV_NAME "rockchip_emac"
#define DRV_VERSION "1.0"
#define GRF_MODE_MII (1UL << 0)
#define GRF_MODE_RMII (0UL << 0)
#define GRF_SPEED_10M (0UL << 1)
#define GRF_SPEED_100M (1UL << 1)
#define GRF_SPEED_ENABLE_BIT (1UL << 17)
#define GRF_MODE_ENABLE_BIT (1UL << 16)
#define DRV_VERSION "1.1"
struct emac_rockchip_soc_data {
int grf_offset;
unsigned int grf_offset;
unsigned int grf_mode_offset;
unsigned int grf_speed_offset;
bool need_div_macclk;
};
struct rockchip_priv_data {
@ -44,23 +40,22 @@ struct rockchip_priv_data {
const struct emac_rockchip_soc_data *soc_data;
struct regulator *regulator;
struct clk *refclk;
struct clk *macclk;
};
static void emac_rockchip_set_mac_speed(void *priv, unsigned int speed)
{
struct rockchip_priv_data *emac = priv;
u32 speed_offset = emac->soc_data->grf_speed_offset;
u32 data;
int err = 0;
/* write-enable bits */
data = GRF_SPEED_ENABLE_BIT;
switch(speed) {
case 10:
data |= GRF_SPEED_10M;
data = (1 << (speed_offset + 16)) | (0 << speed_offset);
break;
case 100:
data |= GRF_SPEED_100M;
data = (1 << (speed_offset + 16)) | (1 << speed_offset);
break;
default:
pr_err("speed %u not supported\n", speed);
@ -72,14 +67,19 @@ static void emac_rockchip_set_mac_speed(void *priv, unsigned int speed)
pr_err("unable to apply speed %u to grf (%d)\n", speed, err);
}
static const struct emac_rockchip_soc_data emac_rockchip_dt_data[] = {
{ .grf_offset = 0x154 }, /* rk3066 */
{ .grf_offset = 0x0a4 }, /* rk3188 */
static const struct emac_rockchip_soc_data emac_rk3066_emac_data = {
.grf_offset = 0x154, .grf_mode_offset = 0,
.grf_speed_offset = 1, .need_div_macclk = 0,
};
static const struct emac_rockchip_soc_data emac_rk3188_emac_data = {
.grf_offset = 0x0a4, .grf_mode_offset = 0,
.grf_speed_offset = 1, .need_div_macclk = 0,
};
static const struct of_device_id emac_rockchip_dt_ids[] = {
{ .compatible = "rockchip,rk3066-emac", .data = &emac_rockchip_dt_data[0] },
{ .compatible = "rockchip,rk3188-emac", .data = &emac_rockchip_dt_data[1] },
{ .compatible = "rockchip,rk3066-emac", .data = &emac_rk3066_emac_data },
{ .compatible = "rockchip,rk3188-emac", .data = &emac_rk3188_emac_data },
{ /* Sentinel */ }
};
@ -164,11 +164,12 @@ static int emac_rockchip_probe(struct platform_device *pdev)
}
}
/* write-enable bits */
data = GRF_MODE_ENABLE_BIT | GRF_SPEED_ENABLE_BIT;
data |= GRF_SPEED_100M;
data |= GRF_MODE_RMII;
/* Set speed 100M */
data = (1 << (priv->soc_data->grf_speed_offset + 16)) |
(1 << priv->soc_data->grf_speed_offset);
/* Set RMII mode */
data |= (1 << (priv->soc_data->grf_mode_offset + 16)) |
(0 << priv->soc_data->grf_mode_offset);
err = regmap_write(priv->grf, priv->soc_data->grf_offset, data);
if (err) {
@ -181,6 +182,26 @@ static int emac_rockchip_probe(struct platform_device *pdev)
if (err)
dev_err(dev, "failed to change reference clock rate (%d)\n", err);
if (priv->soc_data->need_div_macclk) {
priv->macclk = devm_clk_get(dev, "macclk");
if (IS_ERR(priv->macclk)) {
dev_err(dev, "failed to retrieve mac clock (%ld)\n", PTR_ERR(priv->macclk));
err = PTR_ERR(priv->macclk);
goto out_regulator_disable;
}
err = clk_prepare_enable(priv->macclk);
if (err) {
dev_err(dev, "failed to enable mac clock (%d)\n", err);
goto out_regulator_disable;
}
/* RMII TX/RX needs always a rate of 25MHz */
err = clk_set_rate(priv->macclk, 25000000);
if (err)
dev_err(dev, "failed to change mac clock rate (%d)\n", err);
}
err = arc_emac_probe(ndev, interface);
if (err) {
dev_err(dev, "failed to probe arc emac (%d)\n", err);