These function will be required for the Rockchip MIPI-DSI support.
Signed-off-by: Ahmad Fatoum <[email protected]>
---
drivers/phy/Kconfig | 8 +
drivers/phy/Makefile | 1 +
drivers/phy/phy-core-mipi-dphy.c | 187 +++++++++++++++++++
include/linux/phy/phy-mipi-dphy.h | 287 ++++++++++++++++++++++++++++++
include/linux/phy/phy.h | 1 +
include/linux/time64.h | 17 ++
6 files changed, 501 insertions(+)
create mode 100644 drivers/phy/phy-core-mipi-dphy.c
create mode 100644 include/linux/phy/phy-mipi-dphy.h
create mode 100644 include/linux/time64.h
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 52c792914909..6b3364808825 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -16,6 +16,14 @@ menuconfig GENERIC_PHY
if GENERIC_PHY
+config GENERIC_PHY_MIPI_DPHY
+ bool
+ help
+ Generic MIPI D-PHY support.
+
+ Provides a number of helpers a core functions for MIPI D-PHY
+ drivers to us.
+
config USB_NOP_XCEIV
bool "Generic USB nop phy"
help
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index 37e5f32d6a15..0f903c28f4da 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -8,3 +8,4 @@ obj-$(CONFIG_USB_NOP_XCEIV) += usb-nop-xceiv.o
obj-y += freescale/
obj-$(CONFIG_PHY_STM32_USBPHYC) += phy-stm32-usbphyc.o
obj-y += rockchip/
+obj-$(CONFIG_GENERIC_PHY_MIPI_DPHY) += phy-core-mipi-dphy.o
diff --git a/drivers/phy/phy-core-mipi-dphy.c b/drivers/phy/phy-core-mipi-dphy.c
new file mode 100644
index 000000000000..f4956a417a47
--- /dev/null
+++ b/drivers/phy/phy-core-mipi-dphy.c
@@ -0,0 +1,187 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2013 NVIDIA Corporation
+ * Copyright (C) 2018 Cadence Design Systems Inc.
+ */
+
+#include <linux/errno.h>
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include <linux/time64.h>
+
+#include <linux/phy/phy.h>
+#include <linux/phy/phy-mipi-dphy.h>
+
+/*
+ * Minimum D-PHY timings based on MIPI D-PHY specification. Derived
+ * from the valid ranges specified in Section 6.9, Table 14, Page 41
+ * of the D-PHY specification (v1.2).
+ */
+static int phy_mipi_dphy_calc_config(unsigned long pixel_clock,
+ unsigned int bpp,
+ unsigned int lanes,
+ unsigned long long hs_clk_rate,
+ struct phy_configure_opts_mipi_dphy *cfg)
+{
+ unsigned long long ui;
+
+ if (!cfg)
+ return -EINVAL;
+
+ if (!hs_clk_rate) {
+ hs_clk_rate = pixel_clock * bpp;
+ do_div(hs_clk_rate, lanes);
+ }
+
+ ui = ALIGN(PSEC_PER_SEC, hs_clk_rate);
+ do_div(ui, hs_clk_rate);
+
+ cfg->clk_miss = 0;
+ cfg->clk_post = 60000 + 52 * ui;
+ cfg->clk_pre = 8;
+ cfg->clk_prepare = 38000;
+ cfg->clk_settle = 95000;
+ cfg->clk_term_en = 0;
+ cfg->clk_trail = 60000;
+ cfg->clk_zero = 262000;
+ cfg->d_term_en = 0;
+ cfg->eot = 0;
+ cfg->hs_exit = 100000;
+ cfg->hs_prepare = 40000 + 4 * ui;
+ cfg->hs_zero = 105000 + 6 * ui;
+ cfg->hs_settle = 85000 + 6 * ui;
+ cfg->hs_skip = 40000;
+
+ /*
+ * The MIPI D-PHY specification (Section 6.9, v1.2, Table 14, Page 40)
+ * contains this formula as:
+ *
+ * T_HS-TRAIL = max(n * 8 * ui, 60 + n * 4 * ui)
+ *
+ * where n = 1 for forward-direction HS mode and n = 4 for reverse-
+ * direction HS mode. There's only one setting and this function does
+ * not parameterize on anything other that ui, so this code will
+ * assumes that reverse-direction HS mode is supported and uses n = 4.
+ */
+ cfg->hs_trail = max(4 * 8 * ui, 60000 + 4 * 4 * ui);
+
+ cfg->init = 100;
+ cfg->lpx = 50000;
+ cfg->ta_get = 5 * cfg->lpx;
+ cfg->ta_go = 4 * cfg->lpx;
+ cfg->ta_sure = cfg->lpx;
+ cfg->wakeup = 1000;
+
+ cfg->hs_clk_rate = hs_clk_rate;
+ cfg->lanes = lanes;
+
+ return 0;
+}
+
+int phy_mipi_dphy_get_default_config(unsigned long pixel_clock,
+ unsigned int bpp,
+ unsigned int lanes,
+ struct phy_configure_opts_mipi_dphy *cfg)
+{
+ return phy_mipi_dphy_calc_config(pixel_clock, bpp, lanes, 0, cfg);
+
+}
+EXPORT_SYMBOL(phy_mipi_dphy_get_default_config);
+
+int phy_mipi_dphy_get_default_config_for_hsclk(unsigned long long hs_clk_rate,
+ unsigned int lanes,
+ struct
phy_configure_opts_mipi_dphy *cfg)
+{
+ if (!hs_clk_rate)
+ return -EINVAL;
+
+ return phy_mipi_dphy_calc_config(0, 0, lanes, hs_clk_rate, cfg);
+
+}
+EXPORT_SYMBOL(phy_mipi_dphy_get_default_config_for_hsclk);
+
+/*
+ * Validate D-PHY configuration according to MIPI D-PHY specification
+ * (v1.2, Section Section 6.9 "Global Operation Timing Parameters").
+ */
+int phy_mipi_dphy_config_validate(struct phy_configure_opts_mipi_dphy *cfg)
+{
+ unsigned long long ui;
+
+ if (!cfg)
+ return -EINVAL;
+
+ ui = ALIGN(PSEC_PER_SEC, cfg->hs_clk_rate);
+ do_div(ui, cfg->hs_clk_rate);
+
+ if (cfg->clk_miss > 60000)
+ return -EINVAL;
+
+ if (cfg->clk_post < (60000 + 52 * ui))
+ return -EINVAL;
+
+ if (cfg->clk_pre < 8)
+ return -EINVAL;
+
+ if (cfg->clk_prepare < 38000 || cfg->clk_prepare > 95000)
+ return -EINVAL;
+
+ if (cfg->clk_settle < 95000 || cfg->clk_settle > 300000)
+ return -EINVAL;
+
+ if (cfg->clk_term_en > 38000)
+ return -EINVAL;
+
+ if (cfg->clk_trail < 60000)
+ return -EINVAL;
+
+ if ((cfg->clk_prepare + cfg->clk_zero) < 300000)
+ return -EINVAL;
+
+ if (cfg->d_term_en > (35000 + 4 * ui))
+ return -EINVAL;
+
+ if (cfg->eot > (105000 + 12 * ui))
+ return -EINVAL;
+
+ if (cfg->hs_exit < 100000)
+ return -EINVAL;
+
+ if (cfg->hs_prepare < (40000 + 4 * ui) ||
+ cfg->hs_prepare > (85000 + 6 * ui))
+ return -EINVAL;
+
+ if ((cfg->hs_prepare + cfg->hs_zero) < (145000 + 10 * ui))
+ return -EINVAL;
+
+ if ((cfg->hs_settle < (85000 + 6 * ui)) ||
+ (cfg->hs_settle > (145000 + 10 * ui)))
+ return -EINVAL;
+
+ if (cfg->hs_skip < 40000 || cfg->hs_skip > (55000 + 4 * ui))
+ return -EINVAL;
+
+ if (cfg->hs_trail < max(8 * ui, 60000 + 4 * ui))
+ return -EINVAL;
+
+ if (cfg->init < 100)
+ return -EINVAL;
+
+ if (cfg->lpx < 50000)
+ return -EINVAL;
+
+ if (cfg->ta_get != (5 * cfg->lpx))
+ return -EINVAL;
+
+ if (cfg->ta_go != (4 * cfg->lpx))
+ return -EINVAL;
+
+ if (cfg->ta_sure < cfg->lpx || cfg->ta_sure > (2 * cfg->lpx))
+ return -EINVAL;
+
+ if (cfg->wakeup < 1000)
+ return -EINVAL;
+
+ return 0;
+}
+EXPORT_SYMBOL(phy_mipi_dphy_config_validate);
diff --git a/include/linux/phy/phy-mipi-dphy.h
b/include/linux/phy/phy-mipi-dphy.h
new file mode 100644
index 000000000000..1ac128d78dfe
--- /dev/null
+++ b/include/linux/phy/phy-mipi-dphy.h
@@ -0,0 +1,287 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2018 Cadence Design Systems Inc.
+ */
+
+#ifndef __PHY_MIPI_DPHY_H_
+#define __PHY_MIPI_DPHY_H_
+
+/**
+ * struct phy_configure_opts_mipi_dphy - MIPI D-PHY configuration set
+ *
+ * This structure is used to represent the configuration state of a
+ * MIPI D-PHY phy.
+ */
+struct phy_configure_opts_mipi_dphy {
+ /**
+ * @clk_miss:
+ *
+ * Timeout, in picoseconds, for receiver to detect absence of
+ * Clock transitions and disable the Clock Lane HS-RX.
+ *
+ * Maximum value: 60000 ps
+ */
+ unsigned int clk_miss;
+
+ /**
+ * @clk_post:
+ *
+ * Time, in picoseconds, that the transmitter continues to
+ * send HS clock after the last associated Data Lane has
+ * transitioned to LP Mode. Interval is defined as the period
+ * from the end of @hs_trail to the beginning of @clk_trail.
+ *
+ * Minimum value: 60000 ps + 52 * @hs_clk_rate period in ps
+ */
+ unsigned int clk_post;
+
+ /**
+ * @clk_pre:
+ *
+ * Time, in UI, that the HS clock shall be driven by
+ * the transmitter prior to any associated Data Lane beginning
+ * the transition from LP to HS mode.
+ *
+ * Minimum value: 8 UI
+ */
+ unsigned int clk_pre;
+
+ /**
+ * @clk_prepare:
+ *
+ * Time, in picoseconds, that the transmitter drives the Clock
+ * Lane LP-00 Line state immediately before the HS-0 Line
+ * state starting the HS transmission.
+ *
+ * Minimum value: 38000 ps
+ * Maximum value: 95000 ps
+ */
+ unsigned int clk_prepare;
+
+ /**
+ * @clk_settle:
+ *
+ * Time interval, in picoseconds, during which the HS receiver
+ * should ignore any Clock Lane HS transitions, starting from
+ * the beginning of @clk_prepare.
+ *
+ * Minimum value: 95000 ps
+ * Maximum value: 300000 ps
+ */
+ unsigned int clk_settle;
+
+ /**
+ * @clk_term_en:
+ *
+ * Time, in picoseconds, for the Clock Lane receiver to enable
+ * the HS line termination.
+ *
+ * Maximum value: 38000 ps
+ */
+ unsigned int clk_term_en;
+
+ /**
+ * @clk_trail:
+ *
+ * Time, in picoseconds, that the transmitter drives the HS-0
+ * state after the last payload clock bit of a HS transmission
+ * burst.
+ *
+ * Minimum value: 60000 ps
+ */
+ unsigned int clk_trail;
+
+ /**
+ * @clk_zero:
+ *
+ * Time, in picoseconds, that the transmitter drives the HS-0
+ * state prior to starting the Clock.
+ */
+ unsigned int clk_zero;
+
+ /**
+ * @d_term_en:
+ *
+ * Time, in picoseconds, for the Data Lane receiver to enable
+ * the HS line termination.
+ *
+ * Maximum value: 35000 ps + 4 * @hs_clk_rate period in ps
+ */
+ unsigned int d_term_en;
+
+ /**
+ * @eot:
+ *
+ * Transmitted time interval, in picoseconds, from the start
+ * of @hs_trail or @clk_trail, to the start of the LP- 11
+ * state following a HS burst.
+ *
+ * Maximum value: 105000 ps + 12 * @hs_clk_rate period in ps
+ */
+ unsigned int eot;
+
+ /**
+ * @hs_exit:
+ *
+ * Time, in picoseconds, that the transmitter drives LP-11
+ * following a HS burst.
+ *
+ * Minimum value: 100000 ps
+ */
+ unsigned int hs_exit;
+
+ /**
+ * @hs_prepare:
+ *
+ * Time, in picoseconds, that the transmitter drives the Data
+ * Lane LP-00 Line state immediately before the HS-0 Line
+ * state starting the HS transmission.
+ *
+ * Minimum value: 40000 ps + 4 * @hs_clk_rate period in ps
+ * Maximum value: 85000 ps + 6 * @hs_clk_rate period in ps
+ */
+ unsigned int hs_prepare;
+
+ /**
+ * @hs_settle:
+ *
+ * Time interval, in picoseconds, during which the HS receiver
+ * shall ignore any Data Lane HS transitions, starting from
+ * the beginning of @hs_prepare.
+ *
+ * Minimum value: 85000 ps + 6 * @hs_clk_rate period in ps
+ * Maximum value: 145000 ps + 10 * @hs_clk_rate period in ps
+ */
+ unsigned int hs_settle;
+
+ /**
+ * @hs_skip:
+ *
+ * Time interval, in picoseconds, during which the HS-RX
+ * should ignore any transitions on the Data Lane, following a
+ * HS burst. The end point of the interval is defined as the
+ * beginning of the LP-11 state following the HS burst.
+ *
+ * Minimum value: 40000 ps
+ * Maximum value: 55000 ps + 4 * @hs_clk_rate period in ps
+ */
+ unsigned int hs_skip;
+
+ /**
+ * @hs_trail:
+ *
+ * Time, in picoseconds, that the transmitter drives the
+ * flipped differential state after last payload data bit of a
+ * HS transmission burst
+ *
+ * Minimum value: max(8 * @hs_clk_rate period in ps,
+ * 60000 ps + 4 * @hs_clk_rate period in ps)
+ */
+ unsigned int hs_trail;
+
+ /**
+ * @hs_zero:
+ *
+ * Time, in picoseconds, that the transmitter drives the HS-0
+ * state prior to transmitting the Sync sequence.
+ */
+ unsigned int hs_zero;
+
+ /**
+ * @init:
+ *
+ * Time, in microseconds for the initialization period to
+ * complete.
+ *
+ * Minimum value: 100 us
+ */
+ unsigned int init;
+
+ /**
+ * @lpx:
+ *
+ * Transmitted length, in picoseconds, of any Low-Power state
+ * period.
+ *
+ * Minimum value: 50000 ps
+ */
+ unsigned int lpx;
+
+ /**
+ * @ta_get:
+ *
+ * Time, in picoseconds, that the new transmitter drives the
+ * Bridge state (LP-00) after accepting control during a Link
+ * Turnaround.
+ *
+ * Value: 5 * @lpx
+ */
+ unsigned int ta_get;
+
+ /**
+ * @ta_go:
+ *
+ * Time, in picoseconds, that the transmitter drives the
+ * Bridge state (LP-00) before releasing control during a Link
+ * Turnaround.
+ *
+ * Value: 4 * @lpx
+ */
+ unsigned int ta_go;
+
+ /**
+ * @ta_sure:
+ *
+ * Time, in picoseconds, that the new transmitter waits after
+ * the LP-10 state before transmitting the Bridge state
+ * (LP-00) during a Link Turnaround.
+ *
+ * Minimum value: @lpx
+ * Maximum value: 2 * @lpx
+ */
+ unsigned int ta_sure;
+
+ /**
+ * @wakeup:
+ *
+ * Time, in microseconds, that a transmitter drives a Mark-1
+ * state prior to a Stop state in order to initiate an exit
+ * from ULPS.
+ *
+ * Minimum value: 1000 us
+ */
+ unsigned int wakeup;
+
+ /**
+ * @hs_clk_rate:
+ *
+ * Clock rate, in Hertz, of the high-speed clock.
+ */
+ unsigned long hs_clk_rate;
+
+ /**
+ * @lp_clk_rate:
+ *
+ * Clock rate, in Hertz, of the low-power clock.
+ */
+ unsigned long lp_clk_rate;
+
+ /**
+ * @lanes:
+ *
+ * Number of active, consecutive, data lanes, starting from
+ * lane 0, used for the transmissions.
+ */
+ unsigned char lanes;
+};
+
+int phy_mipi_dphy_get_default_config(unsigned long pixel_clock,
+ unsigned int bpp,
+ unsigned int lanes,
+ struct phy_configure_opts_mipi_dphy *cfg);
+int phy_mipi_dphy_get_default_config_for_hsclk(unsigned long long hs_clk_rate,
+ unsigned int lanes,
+ struct
phy_configure_opts_mipi_dphy *cfg);
+int phy_mipi_dphy_config_validate(struct phy_configure_opts_mipi_dphy *cfg);
+
+#endif /* __PHY_MIPI_DPHY_H_ */
diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
index dd28c6eeefc1..b4a99c9c7037 100644
--- a/include/linux/phy/phy.h
+++ b/include/linux/phy/phy.h
@@ -17,6 +17,7 @@
#include <linux/err.h>
#include <of.h>
#include <regulator.h>
+#include <linux/phy/phy-mipi-dphy.h>
struct phy;
diff --git a/include/linux/time64.h b/include/linux/time64.h
new file mode 100644
index 000000000000..720a7eb9d761
--- /dev/null
+++ b/include/linux/time64.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LINUX_TIME64_H
+#define __LINUX_TIME64_H
+
+#define PSEC_PER_NSEC 1000L
+
+/* Parameters used to convert the timespec values: */
+#define MSEC_PER_SEC 1000L
+#define USEC_PER_MSEC 1000L
+#define NSEC_PER_USEC 1000L
+#define NSEC_PER_MSEC 1000000L
+#define USEC_PER_SEC 1000000L
+#define NSEC_PER_SEC 1000000000L
+#define PSEC_PER_SEC 1000000000000LL
+#define FSEC_PER_SEC 1000000000000000LL
+
+#endif /* __LINUX_TIME64_H */
--
2.47.3
