--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com
+ * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_of.h>
+#include <drm/drm_panel.h>
+#include <video/mipi_display.h>
+#include <video/videomode.h>
+
+/* Global (16-bit addressable) */
+#define TC358768_CHIPID 0x0000
+#define TC358768_SYSCTL 0x0002
+#define TC358768_CONFCTL 0x0004
+#define TC358768_VSDLY 0x0006
+#define TC358768_DATAFMT 0x0008
+#define TC358768_GPIOEN 0x000E
+#define TC358768_GPIODIR 0x0010
+#define TC358768_GPIOIN 0x0012
+#define TC358768_GPIOOUT 0x0014
+#define TC358768_PLLCTL0 0x0016
+#define TC358768_PLLCTL1 0x0018
+#define TC358768_CMDBYTE 0x0022
+#define TC358768_PP_MISC 0x0032
+#define TC358768_DSITX_DT 0x0050
+#define TC358768_FIFOSTATUS 0x00F8
+
+/* Debug (16-bit addressable) */
+#define TC358768_VBUFCTRL 0x00E0
+#define TC358768_DBG_WIDTH 0x00E2
+#define TC358768_DBG_VBLANK 0x00E4
+#define TC358768_DBG_DATA 0x00E8
+
+/* TX PHY (32-bit addressable) */
+#define TC358768_CLW_DPHYCONTTX 0x0100
+#define TC358768_D0W_DPHYCONTTX 0x0104
+#define TC358768_D1W_DPHYCONTTX 0x0108
+#define TC358768_D2W_DPHYCONTTX 0x010C
+#define TC358768_D3W_DPHYCONTTX 0x0110
+#define TC358768_CLW_CNTRL 0x0140
+#define TC358768_D0W_CNTRL 0x0144
+#define TC358768_D1W_CNTRL 0x0148
+#define TC358768_D2W_CNTRL 0x014C
+#define TC358768_D3W_CNTRL 0x0150
+
+/* TX PPI (32-bit addressable) */
+#define TC358768_STARTCNTRL 0x0204
+#define TC358768_DSITXSTATUS 0x0208
+#define TC358768_LINEINITCNT 0x0210
+#define TC358768_LPTXTIMECNT 0x0214
+#define TC358768_TCLK_HEADERCNT 0x0218
+#define TC358768_TCLK_TRAILCNT 0x021C
+#define TC358768_THS_HEADERCNT 0x0220
+#define TC358768_TWAKEUP 0x0224
+#define TC358768_TCLK_POSTCNT 0x0228
+#define TC358768_THS_TRAILCNT 0x022C
+#define TC358768_HSTXVREGCNT 0x0230
+#define TC358768_HSTXVREGEN 0x0234
+#define TC358768_TXOPTIONCNTRL 0x0238
+#define TC358768_BTACNTRL1 0x023C
+
+/* TX CTRL (32-bit addressable) */
+#define TC358768_DSI_CONTROL 0x040C
+#define TC358768_DSI_STATUS 0x0410
+#define TC358768_DSI_INT 0x0414
+#define TC358768_DSI_INT_ENA 0x0418
+#define TC358768_DSICMD_RDFIFO 0x0430
+#define TC358768_DSI_ACKERR 0x0434
+#define TC358768_DSI_ACKERR_INTENA 0x0438
+#define TC358768_DSI_ACKERR_HALT 0x043c
+#define TC358768_DSI_RXERR 0x0440
+#define TC358768_DSI_RXERR_INTENA 0x0444
+#define TC358768_DSI_RXERR_HALT 0x0448
+#define TC358768_DSI_ERR 0x044C
+#define TC358768_DSI_ERR_INTENA 0x0450
+#define TC358768_DSI_ERR_HALT 0x0454
+#define TC358768_DSI_CONFW 0x0500
+#define TC358768_DSI_LPCMD 0x0500
+#define TC358768_DSI_RESET 0x0504
+#define TC358768_DSI_INT_CLR 0x050C
+#define TC358768_DSI_START 0x0518
+
+/* DSITX CTRL (16-bit addressable) */
+#define TC358768_DSICMD_TX 0x0600
+#define TC358768_DSICMD_TYPE 0x0602
+#define TC358768_DSICMD_WC 0x0604
+#define TC358768_DSICMD_WD0 0x0610
+#define TC358768_DSICMD_WD1 0x0612
+#define TC358768_DSICMD_WD2 0x0614
+#define TC358768_DSICMD_WD3 0x0616
+#define TC358768_DSI_EVENT 0x0620
+#define TC358768_DSI_VSW 0x0622
+#define TC358768_DSI_VBPR 0x0624
+#define TC358768_DSI_VACT 0x0626
+#define TC358768_DSI_HSW 0x0628
+#define TC358768_DSI_HBPR 0x062A
+#define TC358768_DSI_HACT 0x062C
+
+/* TC358768_DSI_CONTROL (0x040C) register */
+#define TC358768_DSI_CONTROL_DIS_MODE BIT(15)
+#define TC358768_DSI_CONTROL_TXMD BIT(7)
+#define TC358768_DSI_CONTROL_HSCKMD BIT(5)
+#define TC358768_DSI_CONTROL_EOTDIS BIT(0)
+
+/* TC358768_DSI_CONFW (0x0500) register */
+#define TC358768_DSI_CONFW_MODE_SET (5 << 29)
+#define TC358768_DSI_CONFW_MODE_CLR (6 << 29)
+#define TC358768_DSI_CONFW_ADDR_DSI_CONTROL (0x3 << 24)
+
+static const char * const tc358768_supplies[] = {
+ "vddc", "vddmipi", "vddio"
+};
+
+struct tc358768_dsi_output {
+ struct mipi_dsi_device *dev;
+ struct drm_panel *panel;
+ struct drm_bridge *bridge;
+};
+
+struct tc358768_priv {
+ struct device *dev;
+ struct regmap *regmap;
+ struct gpio_desc *reset_gpio;
+ struct regulator_bulk_data supplies[ARRAY_SIZE(tc358768_supplies)];
+ struct clk *refclk;
+ int enabled;
+ int error;
+
+ struct mipi_dsi_host dsi_host;
+ struct drm_bridge bridge;
+ struct tc358768_dsi_output output;
+
+ u32 pd_lines; /* number of Parallel Port Input Data Lines */
+ u32 dsi_lanes; /* number of DSI Lanes */
+
+ /* Parameters for PLL programming */
+ u32 fbd; /* PLL feedback divider */
+ u32 prd; /* PLL input divider */
+ u32 frs; /* PLL Freqency range for HSCK (post divider) */
+
+ u32 dsiclk; /* pll_clk / 2 */
+};
+
+static inline struct tc358768_priv *dsi_host_to_tc358768(struct mipi_dsi_host
+ *host)
+{
+ return container_of(host, struct tc358768_priv, dsi_host);
+}
+
+static inline struct tc358768_priv *bridge_to_tc358768(struct drm_bridge
+ *bridge)
+{
+ return container_of(bridge, struct tc358768_priv, bridge);
+}
+
+static int tc358768_clear_error(struct tc358768_priv *priv)
+{
+ int ret = priv->error;
+
+ priv->error = 0;
+ return ret;
+}
+
+static void tc358768_write(struct tc358768_priv *priv, u32 reg, u32 val)
+{
+ size_t count = 2;
+
+ if (priv->error)
+ return;
+
+ /* 16-bit register? */
+ if (reg < 0x100 || reg >= 0x600)
+ count = 1;
+
+ priv->error = regmap_bulk_write(priv->regmap, reg, &val, count);
+}
+
+static void tc358768_read(struct tc358768_priv *priv, u32 reg, u32 *val)
+{
+ size_t count = 2;
+
+ if (priv->error)
+ return;
+
+ /* 16-bit register? */
+ if (reg < 0x100 || reg >= 0x600) {
+ *val = 0;
+ count = 1;
+ }
+
+ priv->error = regmap_bulk_read(priv->regmap, reg, val, count);
+}
+
+static void tc358768_update_bits(struct tc358768_priv *priv, u32 reg, u32 mask,
+ u32 val)
+{
+ u32 tmp, orig;
+
+ tc358768_read(priv, reg, &orig);
+ tmp = orig & ~mask;
+ tmp |= val & mask;
+ if (tmp != orig)
+ tc358768_write(priv, reg, tmp);
+}
+
+static int tc358768_sw_reset(struct tc358768_priv *priv)
+{
+ /* Assert Reset */
+ tc358768_write(priv, TC358768_SYSCTL, 1);
+ /* Release Reset, Exit Sleep */
+ tc358768_write(priv, TC358768_SYSCTL, 0);
+
+ return tc358768_clear_error(priv);
+}
+
+static void tc358768_hw_enable(struct tc358768_priv *priv)
+{
+ int ret;
+
+ if (priv->enabled)
+ return;
+
+ ret = regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies);
+ if (ret < 0)
+ dev_err(priv->dev, "error enabling regulators (%d)\n", ret);
+
+ if (priv->reset_gpio)
+ usleep_range(200, 300);
+
+ /*
+ * The RESX is active low (GPIO_ACTIVE_LOW).
+ * DEASSERT (value = 0) the reset_gpio to enable the chip
+ */
+ gpiod_set_value_cansleep(priv->reset_gpio, 0);
+
+ /* wait for encoder clocks to stabilize */
+ usleep_range(1000, 2000);
+
+ priv->enabled = true;
+}
+
+static void tc358768_hw_disable(struct tc358768_priv *priv)
+{
+ int ret;
+
+ if (!priv->enabled)
+ return;
+
+ /*
+ * The RESX is active low (GPIO_ACTIVE_LOW).
+ * ASSERT (value = 1) the reset_gpio to disable the chip
+ */
+ gpiod_set_value_cansleep(priv->reset_gpio, 1);
+
+ ret = regulator_bulk_disable(ARRAY_SIZE(priv->supplies),
+ priv->supplies);
+ if (ret < 0)
+ dev_err(priv->dev, "error disabling regulators (%d)\n", ret);
+
+ priv->enabled = false;
+}
+
+static u32 tc358768_pll_to_pclk(struct tc358768_priv *priv, u32 pll_clk)
+{
+ return (u32)div_u64((u64)pll_clk * priv->dsi_lanes, priv->pd_lines);
+}
+
+static u32 tc358768_pclk_to_pll(struct tc358768_priv *priv, u32 pclk)
+{
+ return (u32)div_u64((u64)pclk * priv->pd_lines, priv->dsi_lanes);
+}
+
+static int tc358768_calc_pll(struct tc358768_priv *priv,
+ const struct drm_display_mode *mode,
+ bool verify_only)
+{
+ const u32 frs_limits[] = {
+ 1000000000,
+ 500000000,
+ 250000000,
+ 125000000,
+ 62500000
+ };
+ unsigned long refclk;
+ u32 prd, target_pll, i, max_pll, min_pll;
+ u32 frs, best_diff, best_pll, best_prd, best_fbd;
+
+ target_pll = tc358768_pclk_to_pll(priv, mode->clock * 1000);
+
+ /* pll_clk = RefClk * [(FBD + 1)/ (PRD + 1)] * [1 / (2^FRS)] */
+
+ for (i = 0; i < ARRAY_SIZE(frs_limits); i++)
+ if (target_pll >= frs_limits[i])
+ break;
+
+ if (i == ARRAY_SIZE(frs_limits) || i == 0)
+ return -EINVAL;
+
+ frs = i - 1;
+ max_pll = frs_limits[i - 1];
+ min_pll = frs_limits[i];
+
+ refclk = clk_get_rate(priv->refclk);
+
+ best_diff = UINT_MAX;
+ best_pll = 0;
+ best_prd = 0;
+ best_fbd = 0;
+
+ for (prd = 0; prd < 16; ++prd) {
+ u32 divisor = (prd + 1) * (1 << frs);
+ u32 fbd;
+
+ for (fbd = 0; fbd < 512; ++fbd) {
+ u32 pll, diff;
+
+ pll = (u32)div_u64((u64)refclk * (fbd + 1), divisor);
+
+ if (pll >= max_pll || pll < min_pll)
+ continue;
+
+ diff = max(pll, target_pll) - min(pll, target_pll);
+
+ if (diff < best_diff) {
+ best_diff = diff;
+ best_pll = pll;
+ best_prd = prd;
+ best_fbd = fbd;
+
+ if (best_diff == 0)
+ goto found;
+ }
+ }
+ }
+
+ if (best_diff == UINT_MAX) {
+ dev_err(priv->dev, "could not find suitable PLL setup\n");
+ return -EINVAL;
+ }
+
+found:
+ if (verify_only)
+ return 0;
+
+ priv->fbd = best_fbd;
+ priv->prd = best_prd;
+ priv->frs = frs;
+ priv->dsiclk = best_pll / 2;
+
+ return 0;
+}
+
+static int tc358768_dsi_host_attach(struct mipi_dsi_host *host,
+ struct mipi_dsi_device *dev)
+{
+ struct tc358768_priv *priv = dsi_host_to_tc358768(host);
+ struct drm_bridge *bridge;
+ struct drm_panel *panel;
+ struct device_node *ep;
+ int ret;
+
+ if (dev->lanes > 4) {
+ dev_err(priv->dev, "unsupported number of data lanes(%u)\n",
+ dev->lanes);
+ return -EINVAL;
+ }
+
+ /*
+ * tc358768 supports both Video and Pulse mode, but the driver only
+ * implements Video (event) mode currently
+ */
+ if (!(dev->mode_flags & MIPI_DSI_MODE_VIDEO)) {
+ dev_err(priv->dev, "Only MIPI_DSI_MODE_VIDEO is supported\n");
+ return -ENOTSUPP;
+ }
+
+ /*
+ * tc358768 supports RGB888, RGB666, RGB666_PACKED and RGB565, but only
+ * RGB888 is verified.
+ */
+ if (dev->format != MIPI_DSI_FMT_RGB888) {
+ dev_warn(priv->dev, "Only MIPI_DSI_FMT_RGB888 tested!\n");
+ return -ENOTSUPP;
+ }
+
+ ret = drm_of_find_panel_or_bridge(host->dev->of_node, 1, 0, &panel,
+ &bridge);
+ if (ret)
+ return ret;
+
+ if (panel) {
+ bridge = drm_panel_bridge_add_typed(panel,
+ DRM_MODE_CONNECTOR_DSI);
+ if (IS_ERR(bridge))
+ return PTR_ERR(bridge);
+ }
+
+ priv->output.dev = dev;
+ priv->output.bridge = bridge;
+ priv->output.panel = panel;
+
+ priv->dsi_lanes = dev->lanes;
+
+ /* get input ep (port0/endpoint0) */
+ ret = -EINVAL;
+ ep = of_graph_get_endpoint_by_regs(host->dev->of_node, 0, 0);
+ if (ep) {
+ ret = of_property_read_u32(ep, "data-lines", &priv->pd_lines);
+
+ of_node_put(ep);
+ }
+
+ if (ret)
+ priv->pd_lines = mipi_dsi_pixel_format_to_bpp(dev->format);
+
+ drm_bridge_add(&priv->bridge);
+
+ return 0;
+}
+
+static int tc358768_dsi_host_detach(struct mipi_dsi_host *host,
+ struct mipi_dsi_device *dev)
+{
+ struct tc358768_priv *priv = dsi_host_to_tc358768(host);
+
+ drm_bridge_remove(&priv->bridge);
+ if (priv->output.panel)
+ drm_panel_bridge_remove(priv->output.bridge);
+
+ return 0;
+}
+
+static ssize_t tc358768_dsi_host_transfer(struct mipi_dsi_host *host,
+ const struct mipi_dsi_msg *msg)
+{
+ struct tc358768_priv *priv = dsi_host_to_tc358768(host);
+ struct mipi_dsi_packet packet;
+ int ret;
+
+ if (!priv->enabled) {
+ dev_err(priv->dev, "Bridge is not enabled\n");
+ return -ENODEV;
+ }
+
+ if (msg->rx_len) {
+ dev_warn(priv->dev, "MIPI rx is not supported\n");
+ return -ENOTSUPP;
+ }
+
+ if (msg->tx_len > 8) {
+ dev_warn(priv->dev, "Maximum 8 byte MIPI tx is supported\n");
+ return -ENOTSUPP;
+ }
+
+ ret = mipi_dsi_create_packet(&packet, msg);
+ if (ret)
+ return ret;
+
+ if (mipi_dsi_packet_format_is_short(msg->type)) {
+ tc358768_write(priv, TC358768_DSICMD_TYPE,
+ (0x10 << 8) | (packet.header[0] & 0x3f));
+ tc358768_write(priv, TC358768_DSICMD_WC, 0);
+ tc358768_write(priv, TC358768_DSICMD_WD0,
+ (packet.header[2] << 8) | packet.header[1]);
+ } else {
+ int i;
+
+ tc358768_write(priv, TC358768_DSICMD_TYPE,
+ (0x40 << 8) | (packet.header[0] & 0x3f));
+ tc358768_write(priv, TC358768_DSICMD_WC, packet.payload_length);
+ for (i = 0; i < packet.payload_length; i += 2) {
+ u16 val = packet.payload[i];
+
+ if (i + 1 < packet.payload_length)
+ val |= packet.payload[i + 1] << 8;
+
+ tc358768_write(priv, TC358768_DSICMD_WD0 + i, val);
+ }
+ }
+
+ /* start transfer */
+ tc358768_write(priv, TC358768_DSICMD_TX, 1);
+
+ ret = tc358768_clear_error(priv);
+ if (ret)
+ dev_warn(priv->dev, "Software disable failed: %d\n", ret);
+ else
+ ret = packet.size;
+
+ return ret;
+}
+
+static const struct mipi_dsi_host_ops tc358768_dsi_host_ops = {
+ .attach = tc358768_dsi_host_attach,
+ .detach = tc358768_dsi_host_detach,
+ .transfer = tc358768_dsi_host_transfer,
+};
+
+static int tc358768_bridge_attach(struct drm_bridge *bridge)
+{
+ struct tc358768_priv *priv = bridge_to_tc358768(bridge);
+
+ if (!drm_core_check_feature(bridge->dev, DRIVER_ATOMIC)) {
+ dev_err(priv->dev, "needs atomic updates support\n");
+ return -ENOTSUPP;
+ }
+
+ return drm_bridge_attach(bridge->encoder, priv->output.bridge, bridge);
+}
+
+static enum drm_mode_status
+tc358768_bridge_mode_valid(struct drm_bridge *bridge,
+ const struct drm_display_mode *mode)
+{
+ struct tc358768_priv *priv = bridge_to_tc358768(bridge);
+
+ if (tc358768_calc_pll(priv, mode, true))
+ return MODE_CLOCK_RANGE;
+
+ return MODE_OK;
+}
+
+static void tc358768_bridge_disable(struct drm_bridge *bridge)
+{
+ struct tc358768_priv *priv = bridge_to_tc358768(bridge);
+ int ret;
+
+ /* set FrmStop */
+ tc358768_update_bits(priv, TC358768_PP_MISC, BIT(15), BIT(15));
+
+ /* wait at least for one frame */
+ msleep(50);
+
+ /* clear PP_en */
+ tc358768_update_bits(priv, TC358768_CONFCTL, BIT(6), 0);
+
+ /* set RstPtr */
+ tc358768_update_bits(priv, TC358768_PP_MISC, BIT(14), BIT(14));
+
+ ret = tc358768_clear_error(priv);
+ if (ret)
+ dev_warn(priv->dev, "Software disable failed: %d\n", ret);
+}
+
+static void tc358768_bridge_post_disable(struct drm_bridge *bridge)
+{
+ struct tc358768_priv *priv = bridge_to_tc358768(bridge);
+
+ tc358768_hw_disable(priv);
+}
+
+static int tc358768_setup_pll(struct tc358768_priv *priv,
+ const struct drm_display_mode *mode)
+{
+ u32 fbd, prd, frs;
+ int ret;
+
+ ret = tc358768_calc_pll(priv, mode, false);
+ if (ret) {
+ dev_err(priv->dev, "PLL calculation failed: %d\n", ret);
+ return ret;
+ }
+
+ fbd = priv->fbd;
+ prd = priv->prd;
+ frs = priv->frs;
+
+ dev_dbg(priv->dev, "PLL: refclk %lu, fbd %u, prd %u, frs %u\n",
+ clk_get_rate(priv->refclk), fbd, prd, frs);
+ dev_dbg(priv->dev, "PLL: pll_clk: %u, DSIClk %u, DSIByteClk %u\n",
+ priv->dsiclk * 2, priv->dsiclk, priv->dsiclk / 4);
+ dev_dbg(priv->dev, "PLL: pclk %u (panel: %u)\n",
+ tc358768_pll_to_pclk(priv, priv->dsiclk * 2),
+ mode->clock * 1000);
+
+ /* PRD[15:12] FBD[8:0] */
+ tc358768_write(priv, TC358768_PLLCTL0, (prd << 12) | fbd);
+
+ /* FRS[11:10] LBWS[9:8] CKEN[4] RESETB[1] EN[0] */
+ tc358768_write(priv, TC358768_PLLCTL1,
+ (frs << 10) | (0x2 << 8) | BIT(1) | BIT(0));
+
+ /* wait for lock */
+ usleep_range(1000, 2000);
+
+ /* FRS[11:10] LBWS[9:8] CKEN[4] PLL_CKEN[4] RESETB[1] EN[0] */
+ tc358768_write(priv, TC358768_PLLCTL1,
+ (frs << 10) | (0x2 << 8) | BIT(4) | BIT(1) | BIT(0));
+
+ return tc358768_clear_error(priv);
+}
+
+#define TC358768_PRECISION 1000
+static u32 tc358768_ns_to_cnt(u32 ns, u32 period_nsk)
+{
+ return (ns * TC358768_PRECISION + period_nsk) / period_nsk;
+}
+
+static u32 tc358768_to_ns(u32 nsk)
+{
+ return (nsk / TC358768_PRECISION);
+}
+
+static void tc358768_bridge_pre_enable(struct drm_bridge *bridge)
+{
+ struct tc358768_priv *priv = bridge_to_tc358768(bridge);
+ struct mipi_dsi_device *dsi_dev = priv->output.dev;
+ u32 val, val2, lptxcnt, hact, data_type;
+ const struct drm_display_mode *mode;
+ u32 dsibclk_nsk, dsiclk_nsk, ui_nsk, phy_delay_nsk;
+ u32 dsiclk, dsibclk;
+ int ret, i;
+
+ tc358768_hw_enable(priv);
+
+ ret = tc358768_sw_reset(priv);
+ if (ret) {
+ dev_err(priv->dev, "Software reset failed: %d\n", ret);
+ tc358768_hw_disable(priv);
+ return;
+ }
+
+ mode = &bridge->encoder->crtc->state->adjusted_mode;
+ ret = tc358768_setup_pll(priv, mode);
+ if (ret) {
+ dev_err(priv->dev, "PLL setup failed: %d\n", ret);
+ tc358768_hw_disable(priv);
+ return;
+ }
+
+ dsiclk = priv->dsiclk;
+ dsibclk = dsiclk / 4;
+
+ /* Data Format Control Register */
+ val = BIT(2) | BIT(1) | BIT(0); /* rdswap_en | dsitx_en | txdt_en */
+ switch (dsi_dev->format) {
+ case MIPI_DSI_FMT_RGB888:
+ val |= (0x3 << 4);
+ hact = mode->hdisplay * 3;
+ data_type = MIPI_DSI_PACKED_PIXEL_STREAM_24;
+ break;
+ case MIPI_DSI_FMT_RGB666:
+ val |= (0x4 << 4);
+ hact = mode->hdisplay * 3;
+ data_type = MIPI_DSI_PACKED_PIXEL_STREAM_18;
+ break;
+
+ case MIPI_DSI_FMT_RGB666_PACKED:
+ val |= (0x4 << 4) | BIT(3);
+ hact = mode->hdisplay * 18 / 8;
+ data_type = MIPI_DSI_PIXEL_STREAM_3BYTE_18;
+ break;
+
+ case MIPI_DSI_FMT_RGB565:
+ val |= (0x5 << 4);
+ hact = mode->hdisplay * 2;
+ data_type = MIPI_DSI_PACKED_PIXEL_STREAM_16;
+ break;
+ default:
+ dev_err(priv->dev, "Invalid data format (%u)\n",
+ dsi_dev->format);
+ tc358768_hw_disable(priv);
+ return;
+ }
+
+ /* VSDly[9:0] */
+ tc358768_write(priv, TC358768_VSDLY, 1);
+
+ tc358768_write(priv, TC358768_DATAFMT, val);
+ tc358768_write(priv, TC358768_DSITX_DT, data_type);
+
+ /* Enable D-PHY (HiZ->LP11) */
+ tc358768_write(priv, TC358768_CLW_CNTRL, 0x0000);
+ /* Enable lanes */
+ for (i = 0; i < dsi_dev->lanes; i++)
+ tc358768_write(priv, TC358768_D0W_CNTRL + i * 4, 0x0000);
+
+ /* DSI Timings */
+ dsibclk_nsk = (u32)div_u64((u64)1000000000 * TC358768_PRECISION,
+ dsibclk);
+ dsiclk_nsk = (u32)div_u64((u64)1000000000 * TC358768_PRECISION, dsiclk);
+ ui_nsk = dsiclk_nsk / 2;
+ phy_delay_nsk = dsibclk_nsk + 2 * dsiclk_nsk;
+ dev_dbg(priv->dev, "dsiclk_nsk: %u\n", dsiclk_nsk);
+ dev_dbg(priv->dev, "ui_nsk: %u\n", ui_nsk);
+ dev_dbg(priv->dev, "dsibclk_nsk: %u\n", dsibclk_nsk);
+ dev_dbg(priv->dev, "phy_delay_nsk: %u\n", phy_delay_nsk);
+
+ /* LP11 > 100us for D-PHY Rx Init */
+ val = tc358768_ns_to_cnt(100 * 1000, dsibclk_nsk) - 1;
+ dev_dbg(priv->dev, "LINEINITCNT: 0x%x\n", val);
+ tc358768_write(priv, TC358768_LINEINITCNT, val);
+
+ /* LPTimeCnt > 50ns */
+ val = tc358768_ns_to_cnt(50, dsibclk_nsk) - 1;
+ lptxcnt = val;
+ dev_dbg(priv->dev, "LPTXTIMECNT: 0x%x\n", val);
+ tc358768_write(priv, TC358768_LPTXTIMECNT, val);
+
+ /* 38ns < TCLK_PREPARE < 95ns */
+ val = tc358768_ns_to_cnt(65, dsibclk_nsk) - 1;
+ /* TCLK_PREPARE > 300ns */
+ val2 = tc358768_ns_to_cnt(300 + tc358768_to_ns(3 * ui_nsk),
+ dsibclk_nsk);
+ val |= (val2 - tc358768_to_ns(phy_delay_nsk - dsibclk_nsk)) << 8;
+ dev_dbg(priv->dev, "TCLK_HEADERCNT: 0x%x\n", val);
+ tc358768_write(priv, TC358768_TCLK_HEADERCNT, val);
+
+ /* TCLK_TRAIL > 60ns + 3*UI */
+ val = 60 + tc358768_to_ns(3 * ui_nsk);
+ val = tc358768_ns_to_cnt(val, dsibclk_nsk) - 5;
+ dev_dbg(priv->dev, "TCLK_TRAILCNT: 0x%x\n", val);
+ tc358768_write(priv, TC358768_TCLK_TRAILCNT, val);
+
+ /* 40ns + 4*UI < THS_PREPARE < 85ns + 6*UI */
+ val = 50 + tc358768_to_ns(4 * ui_nsk);
+ val = tc358768_ns_to_cnt(val, dsibclk_nsk) - 1;
+ /* THS_ZERO > 145ns + 10*UI */
+ val2 = tc358768_ns_to_cnt(145 - tc358768_to_ns(ui_nsk), dsibclk_nsk);
+ val |= (val2 - tc358768_to_ns(phy_delay_nsk)) << 8;
+ dev_dbg(priv->dev, "THS_HEADERCNT: 0x%x\n", val);
+ tc358768_write(priv, TC358768_THS_HEADERCNT, val);
+
+ /* TWAKEUP > 1ms in lptxcnt steps */
+ val = tc358768_ns_to_cnt(1020000, dsibclk_nsk);
+ val = val / (lptxcnt + 1) - 1;
+ dev_dbg(priv->dev, "TWAKEUP: 0x%x\n", val);
+ tc358768_write(priv, TC358768_TWAKEUP, val);
+
+ /* TCLK_POSTCNT > 60ns + 52*UI */
+ val = tc358768_ns_to_cnt(60 + tc358768_to_ns(52 * ui_nsk),
+ dsibclk_nsk) - 3;
+ dev_dbg(priv->dev, "TCLK_POSTCNT: 0x%x\n", val);
+ tc358768_write(priv, TC358768_TCLK_POSTCNT, val);
+
+ /* 60ns + 4*UI < THS_PREPARE < 105ns + 12*UI */
+ val = tc358768_ns_to_cnt(60 + tc358768_to_ns(15 * ui_nsk),
+ dsibclk_nsk) - 5;
+ dev_dbg(priv->dev, "THS_TRAILCNT: 0x%x\n", val);
+ tc358768_write(priv, TC358768_THS_TRAILCNT, val);
+
+ val = BIT(0);
+ for (i = 0; i < dsi_dev->lanes; i++)
+ val |= BIT(i + 1);
+ tc358768_write(priv, TC358768_HSTXVREGEN, val);
+
+ if (!(dsi_dev->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS))
+ tc358768_write(priv, TC358768_TXOPTIONCNTRL, 0x1);
+
+ /* TXTAGOCNT[26:16] RXTASURECNT[10:0] */
+ val = tc358768_to_ns((lptxcnt + 1) * dsibclk_nsk * 4);
+ val = tc358768_ns_to_cnt(val, dsibclk_nsk) - 1;
+ val2 = tc358768_ns_to_cnt(tc358768_to_ns((lptxcnt + 1) * dsibclk_nsk),
+ dsibclk_nsk) - 2;
+ val |= val2 << 16;
+ dev_dbg(priv->dev, "BTACNTRL1: 0x%x\n", val);
+ tc358768_write(priv, TC358768_BTACNTRL1, val);
+
+ /* START[0] */
+ tc358768_write(priv, TC358768_STARTCNTRL, 1);
+
+ /* Set event mode */
+ tc358768_write(priv, TC358768_DSI_EVENT, 1);
+
+ /* vsw (+ vbp) */
+ tc358768_write(priv, TC358768_DSI_VSW,
+ mode->vtotal - mode->vsync_start);
+ /* vbp (not used in event mode) */
+ tc358768_write(priv, TC358768_DSI_VBPR, 0);
+ /* vact */
+ tc358768_write(priv, TC358768_DSI_VACT, mode->vdisplay);
+
+ /* (hsw + hbp) * byteclk * ndl / pclk */
+ val = (u32)div_u64((mode->htotal - mode->hsync_start) *
+ ((u64)priv->dsiclk / 4) * priv->dsi_lanes,
+ mode->clock * 1000);
+ tc358768_write(priv, TC358768_DSI_HSW, val);
+ /* hbp (not used in event mode) */
+ tc358768_write(priv, TC358768_DSI_HBPR, 0);
+ /* hact (bytes) */
+ tc358768_write(priv, TC358768_DSI_HACT, hact);
+
+ /* VSYNC polarity */
+ if (!(mode->flags & DRM_MODE_FLAG_NVSYNC))
+ tc358768_update_bits(priv, TC358768_CONFCTL, BIT(5), BIT(5));
+ /* HSYNC polarity */
+ if (mode->flags & DRM_MODE_FLAG_PHSYNC)
+ tc358768_update_bits(priv, TC358768_PP_MISC, BIT(0), BIT(0));
+
+ /* Start DSI Tx */
+ tc358768_write(priv, TC358768_DSI_START, 0x1);
+
+ /* Configure DSI_Control register */
+ val = TC358768_DSI_CONFW_MODE_CLR | TC358768_DSI_CONFW_ADDR_DSI_CONTROL;
+ val |= TC358768_DSI_CONTROL_TXMD | TC358768_DSI_CONTROL_HSCKMD |
+ 0x3 << 1 | TC358768_DSI_CONTROL_EOTDIS;
+ tc358768_write(priv, TC358768_DSI_CONFW, val);
+
+ val = TC358768_DSI_CONFW_MODE_SET | TC358768_DSI_CONFW_ADDR_DSI_CONTROL;
+ val |= (dsi_dev->lanes - 1) << 1;
+
+ if (!(dsi_dev->mode_flags & MIPI_DSI_MODE_LPM))
+ val |= TC358768_DSI_CONTROL_TXMD;
+
+ if (!(dsi_dev->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS))
+ val |= TC358768_DSI_CONTROL_HSCKMD;
+
+ if (dsi_dev->mode_flags & MIPI_DSI_MODE_EOT_PACKET)
+ val |= TC358768_DSI_CONTROL_EOTDIS;
+
+ tc358768_write(priv, TC358768_DSI_CONFW, val);
+
+ val = TC358768_DSI_CONFW_MODE_CLR | TC358768_DSI_CONFW_ADDR_DSI_CONTROL;
+ val |= TC358768_DSI_CONTROL_DIS_MODE; /* DSI mode */
+ tc358768_write(priv, TC358768_DSI_CONFW, val);
+
+ ret = tc358768_clear_error(priv);
+ if (ret) {
+ dev_err(priv->dev, "Bridge pre_enable failed: %d\n", ret);
+ tc358768_bridge_disable(bridge);
+ tc358768_bridge_post_disable(bridge);
+ }
+}
+
+static void tc358768_bridge_enable(struct drm_bridge *bridge)
+{
+ struct tc358768_priv *priv = bridge_to_tc358768(bridge);
+ int ret;
+
+ if (!priv->enabled) {
+ dev_err(priv->dev, "Bridge is not enabled\n");
+ return;
+ }
+
+ /* clear FrmStop and RstPtr */
+ tc358768_update_bits(priv, TC358768_PP_MISC, 0x3 << 14, 0);
+
+ /* set PP_en */
+ tc358768_update_bits(priv, TC358768_CONFCTL, BIT(6), BIT(6));
+
+ ret = tc358768_clear_error(priv);
+ if (ret) {
+ dev_err(priv->dev, "Bridge enable failed: %d\n", ret);
+ tc358768_bridge_disable(bridge);
+ tc358768_bridge_post_disable(bridge);
+ }
+}
+
+static const struct drm_bridge_funcs tc358768_bridge_funcs = {
+ .attach = tc358768_bridge_attach,
+ .mode_valid = tc358768_bridge_mode_valid,
+ .pre_enable = tc358768_bridge_pre_enable,
+ .enable = tc358768_bridge_enable,
+ .disable = tc358768_bridge_disable,
+ .post_disable = tc358768_bridge_post_disable,
+};
+
+static const struct drm_bridge_timings default_tc358768_timings = {
+ .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE
+ | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE
+ | DRM_BUS_FLAG_DE_HIGH,
+};
+
+static bool tc358768_is_reserved_reg(unsigned int reg)
+{
+ switch (reg) {
+ case 0x114 ... 0x13f:
+ case 0x200:
+ case 0x20c:
+ case 0x400 ... 0x408:
+ case 0x41c ... 0x42f:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool tc358768_writeable_reg(struct device *dev, unsigned int reg)
+{
+ if (tc358768_is_reserved_reg(reg))
+ return false;
+
+ switch (reg) {
+ case TC358768_CHIPID:
+ case TC358768_FIFOSTATUS:
+ case TC358768_DSITXSTATUS ... (TC358768_DSITXSTATUS + 2):
+ case TC358768_DSI_CONTROL ... (TC358768_DSI_INT_ENA + 2):
+ case TC358768_DSICMD_RDFIFO ... (TC358768_DSI_ERR_HALT + 2):
+ return false;
+ default:
+ return true;
+ }
+}
+
+static bool tc358768_readable_reg(struct device *dev, unsigned int reg)
+{
+ if (tc358768_is_reserved_reg(reg))
+ return false;
+
+ switch (reg) {
+ case TC358768_STARTCNTRL:
+ case TC358768_DSI_CONFW ... (TC358768_DSI_CONFW + 2):
+ case TC358768_DSI_INT_CLR ... (TC358768_DSI_INT_CLR + 2):
+ case TC358768_DSI_START ... (TC358768_DSI_START + 2):
+ case TC358768_DBG_DATA:
+ return false;
+ default:
+ return true;
+ }
+}
+
+static const struct regmap_config tc358768_regmap_config = {
+ .name = "tc358768",
+ .reg_bits = 16,
+ .val_bits = 16,
+ .max_register = TC358768_DSI_HACT,
+ .cache_type = REGCACHE_NONE,
+ .writeable_reg = tc358768_writeable_reg,
+ .readable_reg = tc358768_readable_reg,
+ .reg_format_endian = REGMAP_ENDIAN_BIG,
+ .val_format_endian = REGMAP_ENDIAN_BIG,
+};
+
+static const struct i2c_device_id tc358768_i2c_ids[] = {
+ { "tc358768", 0 },
+ { "tc358778", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, tc358768_i2c_ids);
+
+static const struct of_device_id tc358768_of_ids[] = {
+ { .compatible = "toshiba,tc358768", },
+ { .compatible = "toshiba,tc358778", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, tc358768_of_ids);
+
+static int tc358768_get_regulators(struct tc358768_priv *priv)
+{
+ int i, ret;
+
+ for (i = 0; i < ARRAY_SIZE(priv->supplies); ++i)
+ priv->supplies[i].supply = tc358768_supplies[i];
+
+ ret = devm_regulator_bulk_get(priv->dev, ARRAY_SIZE(priv->supplies),
+ priv->supplies);
+ if (ret < 0)
+ dev_err(priv->dev, "failed to get regulators: %d\n", ret);
+
+ return ret;
+}
+
+static int tc358768_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct tc358768_priv *priv;
+ struct device *dev = &client->dev;
+ struct device_node *np = dev->of_node;
+ int ret;
+
+ if (!np)
+ return -ENODEV;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ dev_set_drvdata(dev, priv);
+ priv->dev = dev;
+
+ ret = tc358768_get_regulators(priv);
+ if (ret)
+ return ret;
+
+ priv->refclk = devm_clk_get(dev, "refclk");
+ if (IS_ERR(priv->refclk))
+ return PTR_ERR(priv->refclk);
+
+ /*
+ * RESX is low active, to disable tc358768 initially (keep in reset)
+ * the gpio line must be LOW. This is the ASSERTED state of
+ * GPIO_ACTIVE_LOW (GPIOD_OUT_HIGH == ASSERTED).
+ */
+ priv->reset_gpio = devm_gpiod_get_optional(dev, "reset",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(priv->reset_gpio))
+ return PTR_ERR(priv->reset_gpio);
+
+ priv->regmap = devm_regmap_init_i2c(client, &tc358768_regmap_config);
+ if (IS_ERR(priv->regmap)) {
+ dev_err(dev, "Failed to init regmap\n");
+ return PTR_ERR(priv->regmap);
+ }
+
+ priv->dsi_host.dev = dev;
+ priv->dsi_host.ops = &tc358768_dsi_host_ops;
+
+ priv->bridge.funcs = &tc358768_bridge_funcs;
+ priv->bridge.timings = &default_tc358768_timings;
+ priv->bridge.of_node = np;
+
+ i2c_set_clientdata(client, priv);
+
+ return mipi_dsi_host_register(&priv->dsi_host);
+}
+
+static int tc358768_i2c_remove(struct i2c_client *client)
+{
+ struct tc358768_priv *priv = i2c_get_clientdata(client);
+
+ mipi_dsi_host_unregister(&priv->dsi_host);
+
+ return 0;
+}
+
+static struct i2c_driver tc358768_driver = {
+ .driver = {
+ .name = "tc358768",
+ .of_match_table = tc358768_of_ids,
+ },
+ .id_table = tc358768_i2c_ids,
+ .probe = tc358768_i2c_probe,
+ .remove = tc358768_i2c_remove,
+};
+module_i2c_driver(tc358768_driver);
+
+MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
+MODULE_DESCRIPTION("TC358768AXBG/TC358778XBG DSI bridge");
+MODULE_LICENSE("GPL v2");
projects / platform / kernel / linux-rpi.git / commitdiff