--- /dev/null
+/*
+ * Copyright (C) 2017 Sanechips Technology Co., Ltd.
+ * Copyright 2017 Linaro Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drmP.h>
+
+#include "zx_drm_drv.h"
+#include "zx_vga_regs.h"
+#include "zx_vou.h"
+
+struct zx_vga_pwrctrl {
+ struct regmap *regmap;
+ u32 reg;
+ u32 mask;
+};
+
+struct zx_vga_i2c {
+ struct i2c_adapter adap;
+ struct mutex lock;
+};
+
+struct zx_vga {
+ struct drm_connector connector;
+ struct drm_encoder encoder;
+ struct zx_vga_i2c *ddc;
+ struct device *dev;
+ void __iomem *mmio;
+ struct clk *i2c_wclk;
+ struct zx_vga_pwrctrl pwrctrl;
+ struct completion complete;
+ bool connected;
+};
+
+#define to_zx_vga(x) container_of(x, struct zx_vga, x)
+
+static void zx_vga_encoder_enable(struct drm_encoder *encoder)
+{
+ struct zx_vga *vga = to_zx_vga(encoder);
+ struct zx_vga_pwrctrl *pwrctrl = &vga->pwrctrl;
+
+ /* Set bit to power up VGA DACs */
+ regmap_update_bits(pwrctrl->regmap, pwrctrl->reg, pwrctrl->mask,
+ pwrctrl->mask);
+
+ vou_inf_enable(VOU_VGA, encoder->crtc);
+}
+
+static void zx_vga_encoder_disable(struct drm_encoder *encoder)
+{
+ struct zx_vga *vga = to_zx_vga(encoder);
+ struct zx_vga_pwrctrl *pwrctrl = &vga->pwrctrl;
+
+ vou_inf_disable(VOU_VGA, encoder->crtc);
+
+ /* Clear bit to power down VGA DACs */
+ regmap_update_bits(pwrctrl->regmap, pwrctrl->reg, pwrctrl->mask, 0);
+}
+
+static const struct drm_encoder_helper_funcs zx_vga_encoder_helper_funcs = {
+ .enable = zx_vga_encoder_enable,
+ .disable = zx_vga_encoder_disable,
+};
+
+static const struct drm_encoder_funcs zx_vga_encoder_funcs = {
+ .destroy = drm_encoder_cleanup,
+};
+
+static int zx_vga_connector_get_modes(struct drm_connector *connector)
+{
+ struct zx_vga *vga = to_zx_vga(connector);
+ struct edid *edid;
+ int ret;
+
+ /*
+ * Clear both detection bits to switch I2C bus from device
+ * detecting to EDID reading.
+ */
+ zx_writel(vga->mmio + VGA_AUTO_DETECT_SEL, 0);
+
+ edid = drm_get_edid(connector, &vga->ddc->adap);
+ if (!edid) {
+ /*
+ * If EDID reading fails, we set the device state into
+ * disconnected. Locking is not required here, since the
+ * VGA_AUTO_DETECT_SEL register write in irq handler cannot
+ * be triggered when both detection bits are cleared as above.
+ */
+ zx_writel(vga->mmio + VGA_AUTO_DETECT_SEL,
+ VGA_DETECT_SEL_NO_DEVICE);
+ vga->connected = false;
+ return 0;
+ }
+
+ /*
+ * As edid reading succeeds, device must be connected, so we set
+ * up detection bit for unplug interrupt here.
+ */
+ zx_writel(vga->mmio + VGA_AUTO_DETECT_SEL, VGA_DETECT_SEL_HAS_DEVICE);
+
+ drm_mode_connector_update_edid_property(connector, edid);
+ ret = drm_add_edid_modes(connector, edid);
+ kfree(edid);
+
+ return ret;
+}
+
+static enum drm_mode_status
+zx_vga_connector_mode_valid(struct drm_connector *connector,
+ struct drm_display_mode *mode)
+{
+ return MODE_OK;
+}
+
+static struct drm_connector_helper_funcs zx_vga_connector_helper_funcs = {
+ .get_modes = zx_vga_connector_get_modes,
+ .mode_valid = zx_vga_connector_mode_valid,
+};
+
+static enum drm_connector_status
+zx_vga_connector_detect(struct drm_connector *connector, bool force)
+{
+ struct zx_vga *vga = to_zx_vga(connector);
+
+ return vga->connected ? connector_status_connected :
+ connector_status_disconnected;
+}
+
+static const struct drm_connector_funcs zx_vga_connector_funcs = {
+ .dpms = drm_atomic_helper_connector_dpms,
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .detect = zx_vga_connector_detect,
+ .destroy = drm_connector_cleanup,
+ .reset = drm_atomic_helper_connector_reset,
+ .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static int zx_vga_register(struct drm_device *drm, struct zx_vga *vga)
+{
+ struct drm_encoder *encoder = &vga->encoder;
+ struct drm_connector *connector = &vga->connector;
+ struct device *dev = vga->dev;
+ int ret;
+
+ encoder->possible_crtcs = VOU_CRTC_MASK;
+
+ ret = drm_encoder_init(drm, encoder, &zx_vga_encoder_funcs,
+ DRM_MODE_ENCODER_DAC, NULL);
+ if (ret) {
+ DRM_DEV_ERROR(dev, "failed to init encoder: %d\n", ret);
+ return ret;
+ };
+
+ drm_encoder_helper_add(encoder, &zx_vga_encoder_helper_funcs);
+
+ vga->connector.polled = DRM_CONNECTOR_POLL_HPD;
+
+ ret = drm_connector_init(drm, connector, &zx_vga_connector_funcs,
+ DRM_MODE_CONNECTOR_VGA);
+ if (ret) {
+ DRM_DEV_ERROR(dev, "failed to init connector: %d\n", ret);
+ goto clean_encoder;
+ };
+
+ drm_connector_helper_add(connector, &zx_vga_connector_helper_funcs);
+
+ ret = drm_mode_connector_attach_encoder(connector, encoder);
+ if (ret) {
+ DRM_DEV_ERROR(dev, "failed to attach encoder: %d\n", ret);
+ goto clean_connector;
+ };
+
+ return 0;
+
+clean_connector:
+ drm_connector_cleanup(connector);
+clean_encoder:
+ drm_encoder_cleanup(encoder);
+ return ret;
+}
+
+static int zx_vga_pwrctrl_init(struct zx_vga *vga)
+{
+ struct zx_vga_pwrctrl *pwrctrl = &vga->pwrctrl;
+ struct device *dev = vga->dev;
+ struct of_phandle_args out_args;
+ struct regmap *regmap;
+ int ret;
+
+ ret = of_parse_phandle_with_fixed_args(dev->of_node,
+ "zte,vga-power-control", 2, 0, &out_args);
+ if (ret)
+ return ret;
+
+ regmap = syscon_node_to_regmap(out_args.np);
+ if (IS_ERR(regmap)) {
+ ret = PTR_ERR(regmap);
+ goto out;
+ }
+
+ pwrctrl->regmap = regmap;
+ pwrctrl->reg = out_args.args[0];
+ pwrctrl->mask = out_args.args[1];
+
+out:
+ of_node_put(out_args.np);
+ return ret;
+}
+
+static int zx_vga_i2c_read(struct zx_vga *vga, struct i2c_msg *msg)
+{
+ int len = msg->len;
+ u8 *buf = msg->buf;
+ u32 offset = 0;
+ int i;
+
+ reinit_completion(&vga->complete);
+
+ /* Select combo write */
+ zx_writel_mask(vga->mmio + VGA_CMD_CFG, VGA_CMD_COMBO, VGA_CMD_COMBO);
+ zx_writel_mask(vga->mmio + VGA_CMD_CFG, VGA_CMD_RW, 0);
+
+ while (len > 0) {
+ u32 cnt;
+
+ /* Clear RX FIFO */
+ zx_writel_mask(vga->mmio + VGA_RXF_CTRL, VGA_RX_FIFO_CLEAR,
+ VGA_RX_FIFO_CLEAR);
+
+ /* Data offset to read from */
+ zx_writel(vga->mmio + VGA_SUB_ADDR, offset);
+
+ /* Kick off the transfer */
+ zx_writel_mask(vga->mmio + VGA_CMD_CFG, VGA_CMD_TRANS,
+ VGA_CMD_TRANS);
+
+ if (!wait_for_completion_timeout(&vga->complete,
+ msecs_to_jiffies(1000))) {
+ DRM_DEV_ERROR(vga->dev, "transfer timeout\n");
+ return -ETIMEDOUT;
+ }
+
+ cnt = zx_readl(vga->mmio + VGA_RXF_STATUS);
+ cnt = (cnt & VGA_RXF_COUNT_MASK) >> VGA_RXF_COUNT_SHIFT;
+ /* FIFO status may report more data than we need to read */
+ cnt = min_t(u32, len, cnt);
+
+ for (i = 0; i < cnt; i++)
+ *buf++ = zx_readl(vga->mmio + VGA_DATA);
+
+ len -= cnt;
+ offset += cnt;
+ }
+
+ return 0;
+}
+
+static int zx_vga_i2c_write(struct zx_vga *vga, struct i2c_msg *msg)
+{
+ /*
+ * The DDC I2C adapter is only for reading EDID data, so we assume
+ * that the write to this adapter must be the EDID data offset.
+ */
+ if ((msg->len != 1) || ((msg->addr != DDC_ADDR)))
+ return -EINVAL;
+
+ /* Hardware will take care of the slave address shifting */
+ zx_writel(vga->mmio + VGA_DEVICE_ADDR, msg->addr);
+
+ return 0;
+}
+
+static int zx_vga_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
+ int num)
+{
+ struct zx_vga *vga = i2c_get_adapdata(adap);
+ struct zx_vga_i2c *ddc = vga->ddc;
+ int ret = 0;
+ int i;
+
+ mutex_lock(&ddc->lock);
+
+ for (i = 0; i < num; i++) {
+ if (msgs[i].flags & I2C_M_RD)
+ ret = zx_vga_i2c_read(vga, &msgs[i]);
+ else
+ ret = zx_vga_i2c_write(vga, &msgs[i]);
+
+ if (ret < 0)
+ break;
+ }
+
+ if (!ret)
+ ret = num;
+
+ mutex_unlock(&ddc->lock);
+
+ return ret;
+}
+
+static u32 zx_vga_i2c_func(struct i2c_adapter *adapter)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm zx_vga_algorithm = {
+ .master_xfer = zx_vga_i2c_xfer,
+ .functionality = zx_vga_i2c_func,
+};
+
+static int zx_vga_ddc_register(struct zx_vga *vga)
+{
+ struct device *dev = vga->dev;
+ struct i2c_adapter *adap;
+ struct zx_vga_i2c *ddc;
+ int ret;
+
+ ddc = devm_kzalloc(dev, sizeof(*ddc), GFP_KERNEL);
+ if (!ddc)
+ return -ENOMEM;
+
+ vga->ddc = ddc;
+ mutex_init(&ddc->lock);
+
+ adap = &ddc->adap;
+ adap->owner = THIS_MODULE;
+ adap->class = I2C_CLASS_DDC;
+ adap->dev.parent = dev;
+ adap->algo = &zx_vga_algorithm;
+ snprintf(adap->name, sizeof(adap->name), "zx vga i2c");
+
+ ret = i2c_add_adapter(adap);
+ if (ret) {
+ DRM_DEV_ERROR(dev, "failed to add I2C adapter: %d\n", ret);
+ return ret;
+ }
+
+ i2c_set_adapdata(adap, vga);
+
+ return 0;
+}
+
+static irqreturn_t zx_vga_irq_thread(int irq, void *dev_id)
+{
+ struct zx_vga *vga = dev_id;
+
+ drm_helper_hpd_irq_event(vga->connector.dev);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t zx_vga_irq_handler(int irq, void *dev_id)
+{
+ struct zx_vga *vga = dev_id;
+ u32 status;
+
+ status = zx_readl(vga->mmio + VGA_I2C_STATUS);
+
+ /* Clear interrupt status */
+ zx_writel_mask(vga->mmio + VGA_I2C_STATUS, VGA_CLEAR_IRQ,
+ VGA_CLEAR_IRQ);
+
+ if (status & VGA_DEVICE_CONNECTED) {
+ /*
+ * Since VGA_DETECT_SEL bits need to be reset for switching DDC
+ * bus from device detection to EDID read, rather than setting
+ * up HAS_DEVICE bit here, we need to do that in .get_modes
+ * hook for unplug detecting after EDID read succeeds.
+ */
+ vga->connected = true;
+ return IRQ_WAKE_THREAD;
+ }
+
+ if (status & VGA_DEVICE_DISCONNECTED) {
+ zx_writel(vga->mmio + VGA_AUTO_DETECT_SEL,
+ VGA_DETECT_SEL_NO_DEVICE);
+ vga->connected = false;
+ return IRQ_WAKE_THREAD;
+ }
+
+ if (status & VGA_TRANS_DONE) {
+ complete(&vga->complete);
+ return IRQ_HANDLED;
+ }
+
+ return IRQ_NONE;
+}
+
+static void zx_vga_hw_init(struct zx_vga *vga)
+{
+ unsigned long ref = clk_get_rate(vga->i2c_wclk);
+ int div;
+
+ /*
+ * Set up I2C fast speed divider per formula below to get 400kHz.
+ * scl = ref / ((div + 1) * 4)
+ */
+ div = DIV_ROUND_UP(ref / 1000, 400 * 4) - 1;
+ zx_writel(vga->mmio + VGA_CLK_DIV_FS, div);
+
+ /* Set up device detection */
+ zx_writel(vga->mmio + VGA_AUTO_DETECT_PARA, 0x80);
+ zx_writel(vga->mmio + VGA_AUTO_DETECT_SEL, VGA_DETECT_SEL_NO_DEVICE);
+
+ /*
+ * We need to poke monitor via DDC bus to get connection irq
+ * start working.
+ */
+ zx_writel(vga->mmio + VGA_DEVICE_ADDR, DDC_ADDR);
+ zx_writel_mask(vga->mmio + VGA_CMD_CFG, VGA_CMD_TRANS, VGA_CMD_TRANS);
+}
+
+static int zx_vga_bind(struct device *dev, struct device *master, void *data)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct drm_device *drm = data;
+ struct resource *res;
+ struct zx_vga *vga;
+ int irq;
+ int ret;
+
+ vga = devm_kzalloc(dev, sizeof(*vga), GFP_KERNEL);
+ if (!vga)
+ return -ENOMEM;
+
+ vga->dev = dev;
+ dev_set_drvdata(dev, vga);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ vga->mmio = devm_ioremap_resource(dev, res);
+ if (IS_ERR(vga->mmio))
+ return PTR_ERR(vga->mmio);
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ return irq;
+
+ vga->i2c_wclk = devm_clk_get(dev, "i2c_wclk");
+ if (IS_ERR(vga->i2c_wclk)) {
+ ret = PTR_ERR(vga->i2c_wclk);
+ DRM_DEV_ERROR(dev, "failed to get i2c_wclk: %d\n", ret);
+ return ret;
+ }
+
+ ret = zx_vga_pwrctrl_init(vga);
+ if (ret) {
+ DRM_DEV_ERROR(dev, "failed to init power control: %d\n", ret);
+ return ret;
+ }
+
+ ret = zx_vga_ddc_register(vga);
+ if (ret) {
+ DRM_DEV_ERROR(dev, "failed to register ddc: %d\n", ret);
+ return ret;
+ }
+
+ ret = zx_vga_register(drm, vga);
+ if (ret) {
+ DRM_DEV_ERROR(dev, "failed to register vga: %d\n", ret);
+ return ret;
+ }
+
+ init_completion(&vga->complete);
+
+ ret = devm_request_threaded_irq(dev, irq, zx_vga_irq_handler,
+ zx_vga_irq_thread, IRQF_SHARED,
+ dev_name(dev), vga);
+ if (ret) {
+ DRM_DEV_ERROR(dev, "failed to request threaded irq: %d\n", ret);
+ return ret;
+ }
+
+ ret = clk_prepare_enable(vga->i2c_wclk);
+ if (ret)
+ return ret;
+
+ zx_vga_hw_init(vga);
+
+ return 0;
+}
+
+static void zx_vga_unbind(struct device *dev, struct device *master,
+ void *data)
+{
+ struct zx_vga *vga = dev_get_drvdata(dev);
+
+ clk_disable_unprepare(vga->i2c_wclk);
+}
+
+static const struct component_ops zx_vga_component_ops = {
+ .bind = zx_vga_bind,
+ .unbind = zx_vga_unbind,
+};
+
+static int zx_vga_probe(struct platform_device *pdev)
+{
+ return component_add(&pdev->dev, &zx_vga_component_ops);
+}
+
+static int zx_vga_remove(struct platform_device *pdev)
+{
+ component_del(&pdev->dev, &zx_vga_component_ops);
+ return 0;
+}
+
+static const struct of_device_id zx_vga_of_match[] = {
+ { .compatible = "zte,zx296718-vga", },
+ { /* end */ },
+};
+MODULE_DEVICE_TABLE(of, zx_vga_of_match);
+
+struct platform_driver zx_vga_driver = {
+ .probe = zx_vga_probe,
+ .remove = zx_vga_remove,
+ .driver = {
+ .name = "zx-vga",
+ .of_match_table = zx_vga_of_match,
+ },
+};
#include <drm/drm_plane_helper.h>
#include <drm/drmP.h>
+#include "zx_common_regs.h"
#include "zx_drm_drv.h"
#include "zx_plane.h"
#include "zx_vou.h"
struct drm_plane *primary;
struct zx_vou_hw *vou;
void __iomem *chnreg;
+ void __iomem *chncsc;
+ void __iomem *dither;
const struct zx_crtc_regs *regs;
const struct zx_crtc_bits *bits;
enum vou_chn_type chn_type;
.clocks_en_bits = BIT(15),
.clocks_sel_bits = BIT(11) | BIT(0),
},
+ [VOU_VGA] = {
+ .data_sel = VOU_RGB_888,
+ .clocks_en_bits = BIT(1),
+ .clocks_sel_bits = BIT(10),
+ },
};
static inline struct zx_vou_hw *crtc_to_vou(struct drm_crtc *crtc)
struct zx_crtc *zcrtc = to_zx_crtc(crtc);
struct zx_vou_hw *vou = zcrtc->vou;
struct vou_inf *inf = &vou_infs[id];
+ void __iomem *dither = zcrtc->dither;
+ void __iomem *csc = zcrtc->chncsc;
bool is_main = zcrtc->chn_type == VOU_CHN_MAIN;
u32 data_sel_shift = id << 1;
+ if (inf->data_sel != VOU_YUV444) {
+ /* Enable channel CSC for RGB output */
+ zx_writel_mask(csc + CSC_CTRL0, CSC_COV_MODE_MASK,
+ CSC_BT709_IMAGE_YCBCR2RGB << CSC_COV_MODE_SHIFT);
+ zx_writel_mask(csc + CSC_CTRL0, CSC_WORK_ENABLE,
+ CSC_WORK_ENABLE);
+
+ /* Bypass Dither block for RGB output */
+ zx_writel_mask(dither + OSD_DITHER_CTRL0, DITHER_BYSPASS,
+ DITHER_BYSPASS);
+ } else {
+ zx_writel_mask(csc + CSC_CTRL0, CSC_WORK_ENABLE, 0);
+ zx_writel_mask(dither + OSD_DITHER_CTRL0, DITHER_BYSPASS, 0);
+ }
+
/* Select data format */
zx_writel_mask(vou->vouctl + VOU_INF_DATA_SEL, 0x3 << data_sel_shift,
inf->data_sel << data_sel_shift);
if (chn_type == VOU_CHN_MAIN) {
zplane->layer = vou->osd + MAIN_GL_OFFSET;
- zplane->csc = vou->osd + MAIN_CSC_OFFSET;
+ zplane->csc = vou->osd + MAIN_GL_CSC_OFFSET;
zplane->hbsc = vou->osd + MAIN_HBSC_OFFSET;
zplane->rsz = vou->otfppu + MAIN_RSZ_OFFSET;
zplane->bits = &zx_gl_bits[0];
zcrtc->chnreg = vou->osd + OSD_MAIN_CHN;
+ zcrtc->chncsc = vou->osd + MAIN_CHN_CSC_OFFSET;
+ zcrtc->dither = vou->osd + MAIN_DITHER_OFFSET;
zcrtc->regs = &main_crtc_regs;
zcrtc->bits = &main_crtc_bits;
} else {
zplane->layer = vou->osd + AUX_GL_OFFSET;
- zplane->csc = vou->osd + AUX_CSC_OFFSET;
+ zplane->csc = vou->osd + AUX_GL_CSC_OFFSET;
zplane->hbsc = vou->osd + AUX_HBSC_OFFSET;
zplane->rsz = vou->otfppu + AUX_RSZ_OFFSET;
zplane->bits = &zx_gl_bits[1];
zcrtc->chnreg = vou->osd + OSD_AUX_CHN;
+ zcrtc->chncsc = vou->osd + AUX_CHN_CSC_OFFSET;
+ zcrtc->dither = vou->osd + AUX_DITHER_OFFSET;
zcrtc->regs = &aux_crtc_regs;
zcrtc->bits = &aux_crtc_bits;
}
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