[PATCH 3/4] phy: Add Amlogic AXG MIPI D-PHY driver
Neil Armstrong
narmstrong at baylibre.com
Tue Dec 29 14:59:00 CET 2020
The Amlogic AXG SoCs embeds a MIPI D-PHY used to communicate with DSI
panels.
This D-PHY depends on a separate analog PHY.
Signed-off-by:Neil Armstrong <narmstrong at baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong at baylibre.com>
---
drivers/phy/Kconfig | 9 +
drivers/phy/Makefile | 1 +
drivers/phy/meson-axg-mipi-dphy.c | 393 ++++++++++++++++++++++++++++++
3 files changed, 403 insertions(+)
create mode 100644 drivers/phy/meson-axg-mipi-dphy.c
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 8d9da17b53..00d77eef08 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -196,6 +196,15 @@ config MESON_G12A_USB_PHY
This is the generic phy driver for the Amlogic Meson G12A
USB2 and USB3 PHYS.
+config MESON_AXG_MIPI_DPHY
+ bool "Amlogic Meson AXG MIPI D-PHY"
+ depends on PHY && ARCH_MESON && MESON_AXG
+ select MIPI_DPHY_HELPERS
+ imply REGMAP
+ help
+ This is the generic phy driver for the Amlogic Meson AXG
+ MIPI D-PHY.
+
config MSM8916_USB_PHY
bool "Qualcomm MSM8916 USB PHY support"
depends on PHY
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index 9024002822..b2fd2d06f6 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -22,6 +22,7 @@ obj-$(CONFIG_PHY_STM32_USBPHYC) += phy-stm32-usbphyc.o
obj-$(CONFIG_MESON_GXBB_USB_PHY) += meson-gxbb-usb2.o
obj-$(CONFIG_MESON_GXL_USB_PHY) += meson-gxl-usb2.o
obj-$(CONFIG_MESON_G12A_USB_PHY) += meson-g12a-usb2.o meson-g12a-usb3-pcie.o
+obj-$(CONFIG_MESON_AXG_MIPI_DPHY) += meson-axg-mipi-dphy.o
obj-$(CONFIG_MSM8916_USB_PHY) += msm8916-usbh-phy.o
obj-$(CONFIG_OMAP_USB2_PHY) += omap-usb2-phy.o
obj-$(CONFIG_KEYSTONE_USB_PHY) += keystone-usb-phy.o
diff --git a/drivers/phy/meson-axg-mipi-dphy.c b/drivers/phy/meson-axg-mipi-dphy.c
new file mode 100644
index 0000000000..8b2469793d
--- /dev/null
+++ b/drivers/phy/meson-axg-mipi-dphy.c
@@ -0,0 +1,393 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Meson AXG MIPI DPHY driver
+ *
+ * Copyright (C) 2018 Amlogic, Inc. All rights reserved
+ * Copyright (C) 2020 BayLibre, SAS
+ * Author: Neil Armstrong <narmstrong at baylibre.com>
+ */
+
+#include <common.h>
+#include <log.h>
+#include <malloc.h>
+#include <asm/io.h>
+#include <bitfield.h>
+#include <dm.h>
+#include <errno.h>
+#include <generic-phy.h>
+#include <regmap.h>
+#include <linux/delay.h>
+#include <power/regulator.h>
+#include <reset.h>
+#include <clk.h>
+#include <phy-mipi-dphy.h>
+
+#include <linux/bitops.h>
+#include <linux/compat.h>
+#include <linux/bitfield.h>
+
+/* [31] soft reset for the phy.
+ * 1: reset. 0: dessert the reset.
+ * [30] clock lane soft reset.
+ * [29] data byte lane 3 soft reset.
+ * [28] data byte lane 2 soft reset.
+ * [27] data byte lane 1 soft reset.
+ * [26] data byte lane 0 soft reset.
+ * [25] mipi dsi pll clock selection.
+ * 1: clock from fixed 850Mhz clock source. 0: from VID2 PLL.
+ * [12] mipi HSbyteclk enable.
+ * [11] mipi divider clk selection.
+ * 1: select the mipi DDRCLKHS from clock divider.
+ * 0: from PLL clock.
+ * [10] mipi clock divider control.
+ * 1: /4. 0: /2.
+ * [9] mipi divider output enable.
+ * [8] mipi divider counter enable.
+ * [7] PLL clock enable.
+ * [5] LPDT data endian.
+ * 1 = transfer the high bit first. 0 : transfer the low bit first.
+ * [4] HS data endian.
+ * [3] force data byte lane in stop mode.
+ * [2] force data byte lane 0 in receiver mode.
+ * [1] write 1 to sync the txclkesc input. the internal logic have to
+ * use txclkesc to decide Txvalid and Txready.
+ * [0] enalbe the MIPI DPHY TxDDRClk.
+ */
+#define MIPI_DSI_PHY_CTRL 0x0
+
+/* [31] clk lane tx_hs_en control selection.
+ * 1: from register. 0: use clk lane state machine.
+ * [30] register bit for clock lane tx_hs_en.
+ * [29] clk lane tx_lp_en contrl selection.
+ * 1: from register. 0: from clk lane state machine.
+ * [28] register bit for clock lane tx_lp_en.
+ * [27] chan0 tx_hs_en control selection.
+ * 1: from register. 0: from chan0 state machine.
+ * [26] register bit for chan0 tx_hs_en.
+ * [25] chan0 tx_lp_en control selection.
+ * 1: from register. 0: from chan0 state machine.
+ * [24] register bit from chan0 tx_lp_en.
+ * [23] chan0 rx_lp_en control selection.
+ * 1: from register. 0: from chan0 state machine.
+ * [22] register bit from chan0 rx_lp_en.
+ * [21] chan0 contention detection enable control selection.
+ * 1: from register. 0: from chan0 state machine.
+ * [20] register bit from chan0 contention dectection enable.
+ * [19] chan1 tx_hs_en control selection.
+ * 1: from register. 0: from chan0 state machine.
+ * [18] register bit for chan1 tx_hs_en.
+ * [17] chan1 tx_lp_en control selection.
+ * 1: from register. 0: from chan0 state machine.
+ * [16] register bit from chan1 tx_lp_en.
+ * [15] chan2 tx_hs_en control selection.
+ * 1: from register. 0: from chan0 state machine.
+ * [14] register bit for chan2 tx_hs_en.
+ * [13] chan2 tx_lp_en control selection.
+ * 1: from register. 0: from chan0 state machine.
+ * [12] register bit from chan2 tx_lp_en.
+ * [11] chan3 tx_hs_en control selection.
+ * 1: from register. 0: from chan0 state machine.
+ * [10] register bit for chan3 tx_hs_en.
+ * [9] chan3 tx_lp_en control selection.
+ * 1: from register. 0: from chan0 state machine.
+ * [8] register bit from chan3 tx_lp_en.
+ * [4] clk chan power down. this bit is also used as the power down
+ * of the whole MIPI_DSI_PHY.
+ * [3] chan3 power down.
+ * [2] chan2 power down.
+ * [1] chan1 power down.
+ * [0] chan0 power down.
+ */
+#define MIPI_DSI_CHAN_CTRL 0x4
+
+/* [24] rx turn watch dog triggered.
+ * [23] rx esc watchdog triggered.
+ * [22] mbias ready.
+ * [21] txclkesc synced and ready.
+ * [20:17] clk lane state. {mbias_ready, tx_stop, tx_ulps, tx_hs_active}
+ * [16:13] chan3 state{0, tx_stop, tx_ulps, tx_hs_active}
+ * [12:9] chan2 state.{0, tx_stop, tx_ulps, tx_hs_active}
+ * [8:5] chan1 state. {0, tx_stop, tx_ulps, tx_hs_active}
+ * [4:0] chan0 state. {TX_STOP, tx_ULPS, hs_active, direction, rxulpsesc}
+ */
+#define MIPI_DSI_CHAN_STS 0x8
+
+/* [31:24] TCLK_PREPARE.
+ * [23:16] TCLK_ZERO.
+ * [15:8] TCLK_POST.
+ * [7:0] TCLK_TRAIL.
+ */
+#define MIPI_DSI_CLK_TIM 0xc
+
+/* [31:24] THS_PREPARE.
+ * [23:16] THS_ZERO.
+ * [15:8] THS_TRAIL.
+ * [7:0] THS_EXIT.
+ */
+#define MIPI_DSI_HS_TIM 0x10
+
+/* [31:24] tTA_GET.
+ * [23:16] tTA_GO.
+ * [15:8] tTA_SURE.
+ * [7:0] tLPX.
+ */
+#define MIPI_DSI_LP_TIM 0x14
+
+/* wait time to MIPI DIS analog ready. */
+#define MIPI_DSI_ANA_UP_TIM 0x18
+
+/* TINIT. */
+#define MIPI_DSI_INIT_TIM 0x1c
+
+/* TWAKEUP. */
+#define MIPI_DSI_WAKEUP_TIM 0x20
+
+/* when in RxULPS check state, after the the logic enable the analog,
+ * how long we should wait to check the lP state .
+ */
+#define MIPI_DSI_LPOK_TIM 0x24
+
+/* Watchdog for RX low power state no finished. */
+#define MIPI_DSI_LP_WCHDOG 0x28
+
+/* tMBIAS, after send power up signals to analog,
+ * how long we should wait for analog powered up.
+ */
+#define MIPI_DSI_ANA_CTRL 0x2c
+
+/* [31:8] reserved for future.
+ * [7:0] tCLK_PRE.
+ */
+#define MIPI_DSI_CLK_TIM1 0x30
+
+/* watchdog for turn around waiting time. */
+#define MIPI_DSI_TURN_WCHDOG 0x34
+
+/* When in RxULPS state, how frequency we should to check
+ * if the TX side out of ULPS state.
+ */
+#define MIPI_DSI_ULPS_CHECK 0x38
+#define MIPI_DSI_TEST_CTRL0 0x3c
+#define MIPI_DSI_TEST_CTRL1 0x40
+
+#define NSEC_PER_MSEC 1000000L
+
+struct phy_meson_axg_mipi_dphy_priv {
+ struct regmap *regmap;
+#if CONFIG_IS_ENABLED(CLK)
+ struct clk clk;
+#endif
+ struct reset_ctl reset;
+ struct phy analog;
+ struct phy_configure_opts_mipi_dphy config;
+};
+
+static int phy_meson_axg_mipi_dphy_configure(struct phy *phy, void *params)
+{
+ struct udevice *dev = phy->dev;
+ struct phy_meson_axg_mipi_dphy_priv *priv = dev_get_priv(dev);
+ struct phy_configure_opts_mipi_dphy *config = params;
+ int ret;
+
+ ret = phy_mipi_dphy_config_validate(config);
+ if (ret)
+ return ret;
+
+ ret = generic_phy_configure(&priv->analog, config);
+ if (ret)
+ return ret;
+
+ memcpy(&priv->config, config, sizeof(priv->config));
+
+ return 0;
+}
+
+static int phy_meson_axg_mipi_dphy_power_on(struct phy *phy)
+{
+ struct udevice *dev = phy->dev;
+ struct phy_meson_axg_mipi_dphy_priv *priv = dev_get_priv(dev);
+ unsigned long temp;
+ int ret;
+
+ ret = generic_phy_power_on(&priv->analog);
+ if (ret)
+ return ret;
+
+ /* enable phy clock */
+ regmap_write(priv->regmap, MIPI_DSI_PHY_CTRL, 0x1);
+ regmap_write(priv->regmap, MIPI_DSI_PHY_CTRL,
+ BIT(0) | /* enable the DSI PLL clock . */
+ BIT(7) | /* enable pll clock which connected to DDR clock path */
+ BIT(8)); /* enable the clock divider counter */
+
+ /* enable the divider clock out */
+ regmap_update_bits(priv->regmap, MIPI_DSI_PHY_CTRL, BIT(9), BIT(9));
+
+ /* enable the byte clock generation. */
+ regmap_update_bits(priv->regmap, MIPI_DSI_PHY_CTRL, BIT(12), BIT(12));
+ regmap_update_bits(priv->regmap, MIPI_DSI_PHY_CTRL, BIT(31), BIT(31));
+ regmap_update_bits(priv->regmap, MIPI_DSI_PHY_CTRL, BIT(31), 0);
+
+ /* Calculate lanebyteclk period in ps */
+ temp = (1000000 * 100) / (priv->config.hs_clk_rate / 1000);
+ temp = temp * 8 * 10;
+
+ regmap_write(priv->regmap, MIPI_DSI_CLK_TIM,
+ DIV_ROUND_UP(priv->config.clk_trail, temp) |
+ (DIV_ROUND_UP(priv->config.clk_post +
+ priv->config.hs_trail, temp) << 8) |
+ (DIV_ROUND_UP(priv->config.clk_zero, temp) << 16) |
+ (DIV_ROUND_UP(priv->config.clk_prepare, temp) << 24));
+ regmap_write(priv->regmap, MIPI_DSI_CLK_TIM1,
+ DIV_ROUND_UP(priv->config.clk_pre, temp));
+
+ regmap_write(priv->regmap, MIPI_DSI_HS_TIM,
+ DIV_ROUND_UP(priv->config.hs_exit, temp) |
+ (DIV_ROUND_UP(priv->config.hs_trail, temp) << 8) |
+ (DIV_ROUND_UP(priv->config.hs_zero, temp) << 16) |
+ (DIV_ROUND_UP(priv->config.hs_prepare, temp) << 24));
+
+ regmap_write(priv->regmap, MIPI_DSI_LP_TIM,
+ DIV_ROUND_UP(priv->config.lpx, temp) |
+ (DIV_ROUND_UP(priv->config.ta_sure, temp) << 8) |
+ (DIV_ROUND_UP(priv->config.ta_go, temp) << 16) |
+ (DIV_ROUND_UP(priv->config.ta_get, temp) << 24));
+
+ regmap_write(priv->regmap, MIPI_DSI_ANA_UP_TIM, 0x0100);
+ regmap_write(priv->regmap, MIPI_DSI_INIT_TIM,
+ DIV_ROUND_UP(priv->config.init * NSEC_PER_MSEC, temp));
+ regmap_write(priv->regmap, MIPI_DSI_WAKEUP_TIM,
+ DIV_ROUND_UP(priv->config.wakeup * NSEC_PER_MSEC, temp));
+ regmap_write(priv->regmap, MIPI_DSI_LPOK_TIM, 0x7C);
+ regmap_write(priv->regmap, MIPI_DSI_ULPS_CHECK, 0x927C);
+ regmap_write(priv->regmap, MIPI_DSI_LP_WCHDOG, 0x1000);
+ regmap_write(priv->regmap, MIPI_DSI_TURN_WCHDOG, 0x1000);
+
+ /* Powerup the analog circuit */
+ switch (priv->config.lanes) {
+ case 1:
+ regmap_write(priv->regmap, MIPI_DSI_CHAN_CTRL, 0xe);
+ break;
+ case 2:
+ regmap_write(priv->regmap, MIPI_DSI_CHAN_CTRL, 0xc);
+ break;
+ case 3:
+ regmap_write(priv->regmap, MIPI_DSI_CHAN_CTRL, 0x8);
+ break;
+ case 4:
+ default:
+ regmap_write(priv->regmap, MIPI_DSI_CHAN_CTRL, 0);
+ break;
+ }
+
+ /* Trigger a sync active for esc_clk */
+ regmap_update_bits(priv->regmap, MIPI_DSI_PHY_CTRL, BIT(1), BIT(1));
+
+ return 0;
+}
+
+static int phy_meson_axg_mipi_dphy_power_off(struct phy *phy)
+{
+ struct udevice *dev = phy->dev;
+ struct phy_meson_axg_mipi_dphy_priv *priv = dev_get_priv(dev);
+
+ regmap_write(priv->regmap, MIPI_DSI_CHAN_CTRL, 0xf);
+ regmap_write(priv->regmap, MIPI_DSI_PHY_CTRL, BIT(31));
+
+ return generic_phy_power_off(&priv->analog);
+}
+
+static int phy_meson_axg_mipi_dphy_init(struct phy *phy)
+{
+ struct udevice *dev = phy->dev;
+ struct phy_meson_axg_mipi_dphy_priv *priv = dev_get_priv(dev);
+ int ret;
+
+ ret = generic_phy_init(&priv->analog);
+ if (ret)
+ return ret;
+
+ ret = reset_assert(&priv->reset);
+ udelay(1);
+ ret |= reset_deassert(&priv->reset);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int phy_meson_axg_mipi_dphy_exit(struct phy *phy)
+{
+ struct udevice *dev = phy->dev;
+ struct phy_meson_axg_mipi_dphy_priv *priv = dev_get_priv(dev);
+ int ret;
+
+ ret = generic_phy_exit(&priv->analog);
+ if (ret)
+ return ret;
+
+ return reset_assert(&priv->reset);
+}
+
+struct phy_ops meson_axg_mipi_dphy_ops = {
+ .init = phy_meson_axg_mipi_dphy_init,
+ .exit = phy_meson_axg_mipi_dphy_exit,
+ .power_on = phy_meson_axg_mipi_dphy_power_on,
+ .power_off = phy_meson_axg_mipi_dphy_power_off,
+ .configure = phy_meson_axg_mipi_dphy_configure,
+};
+
+int meson_axg_mipi_dphy_probe(struct udevice *dev)
+{
+ struct phy_meson_axg_mipi_dphy_priv *priv = dev_get_priv(dev);
+ int ret;
+
+ ret = regmap_init_mem(dev_ofnode(dev), &priv->regmap);
+ if (ret)
+ return ret;
+
+ ret = generic_phy_get_by_index(dev, 0, &priv->analog);
+ if (ret)
+ return ret;
+
+ ret = reset_get_by_index(dev, 0, &priv->reset);
+ if (ret == -ENOTSUPP)
+ return 0;
+ else if (ret)
+ return ret;
+
+ ret = reset_deassert(&priv->reset);
+ if (ret) {
+ reset_release_all(&priv->reset, 1);
+ return ret;
+ }
+
+#if CONFIG_IS_ENABLED(CLK)
+ ret = clk_get_by_index(dev, 0, &priv->clk);
+ if (ret < 0)
+ return ret;
+
+ ret = clk_enable(&priv->clk);
+ if (ret && ret != -ENOSYS && ret != -ENOTSUPP) {
+ pr_err("failed to enable PHY clock\n");
+ clk_free(&priv->clk);
+ return ret;
+ }
+#endif
+
+ return 0;
+}
+
+static const struct udevice_id meson_axg_mipi_dphy_ids[] = {
+ { .compatible = "amlogic,axg-mipi-dphy" },
+ { }
+};
+
+U_BOOT_DRIVER(meson_axg_mipi_dphy) = {
+ .name = "meson_axg_mipi_dphy",
+ .id = UCLASS_PHY,
+ .of_match = meson_axg_mipi_dphy_ids,
+ .probe = meson_axg_mipi_dphy_probe,
+ .ops = &meson_axg_mipi_dphy_ops,
+ .priv_auto_alloc_size = sizeof(struct phy_meson_axg_mipi_dphy_priv),
+};
--
2.25.1
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