/*
* Copyright (c) 2015 MediaTek Inc.
* Authors:
* YT Shen <yt.shen@mediatek.com>
* CK Hu <ck.hu@mediatek.com>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/clk.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <drm/drmP.h>
#include "mtk_drm_drv.h"
#include "mtk_drm_plane.h"
#include "mtk_drm_ddp_comp.h"
#include "mtk_drm_crtc.h"
#define DISP_OD_EN 0x0000
#define DISP_OD_INTEN 0x0008
#define DISP_OD_INTSTA 0x000c
#define DISP_OD_CFG 0x0020
#define DISP_OD_SIZE 0x0030
#define DISP_DITHER_5 0x0114
#define DISP_DITHER_7 0x011c
#define DISP_DITHER_15 0x013c
#define DISP_DITHER_16 0x0140
#define DISP_REG_UFO_START 0x0000
#define DISP_AAL_EN 0x0000
#define DISP_AAL_SIZE 0x0030
#define DISP_GAMMA_EN 0x0000
#define DISP_GAMMA_CFG 0x0020
#define DISP_GAMMA_SIZE 0x0030
#define DISP_GAMMA_LUT 0x0700
#define LUT_10BIT_MASK 0x03ff
#define OD_RELAYMODE BIT(0)
#define UFO_BYPASS BIT(2)
#define AAL_EN BIT(0)
#define GAMMA_EN BIT(0)
#define GAMMA_LUT_EN BIT(1)
#define DISP_DITHERING BIT(2)
#define DITHER_LSB_ERR_SHIFT_R(x) (((x) & 0x7) << 28)
#define DITHER_OVFLW_BIT_R(x) (((x) & 0x7) << 24)
#define DITHER_ADD_LSHIFT_R(x) (((x) & 0x7) << 20)
#define DITHER_ADD_RSHIFT_R(x) (((x) & 0x7) << 16)
#define DITHER_NEW_BIT_MODE BIT(0)
#define DITHER_LSB_ERR_SHIFT_B(x) (((x) & 0x7) << 28)
#define DITHER_OVFLW_BIT_B(x) (((x) & 0x7) << 24)
#define DITHER_ADD_LSHIFT_B(x) (((x) & 0x7) << 20)
#define DITHER_ADD_RSHIFT_B(x) (((x) & 0x7) << 16)
#define DITHER_LSB_ERR_SHIFT_G(x) (((x) & 0x7) << 12)
#define DITHER_OVFLW_BIT_G(x) (((x) & 0x7) << 8)
#define DITHER_ADD_LSHIFT_G(x) (((x) & 0x7) << 4)
#define DITHER_ADD_RSHIFT_G(x) (((x) & 0x7) << 0)
void mtk_dither_set(struct mtk_ddp_comp *comp, unsigned int bpc,
unsigned int CFG)
{
/* If bpc equal to 0, the dithering function didn't be enabled */
if (bpc == 0)
return;
if (bpc >= MTK_MIN_BPC) {
writel(0, comp->regs + DISP_DITHER_5);
writel(0, comp->regs + DISP_DITHER_7);
writel(DITHER_LSB_ERR_SHIFT_R(MTK_MAX_BPC - bpc) |
DITHER_ADD_LSHIFT_R(MTK_MAX_BPC - bpc) |
DITHER_NEW_BIT_MODE,
comp->regs + DISP_DITHER_15);
writel(DITHER_LSB_ERR_SHIFT_B(MTK_MAX_BPC - bpc) |
DITHER_ADD_LSHIFT_B(MTK_MAX_BPC - bpc) |
DITHER_LSB_ERR_SHIFT_G(MTK_MAX_BPC - bpc) |
DITHER_ADD_LSHIFT_G(MTK_MAX_BPC - bpc),
comp->regs + DISP_DITHER_16);
writel(DISP_DITHERING, comp->regs + CFG);
}
}
static void mtk_od_config(struct mtk_ddp_comp *comp, unsigned int w,
unsigned int h, unsigned int vrefresh,
unsigned int bpc)
{
writel(w << 16 | h, comp->regs + DISP_OD_SIZE);
writel(OD_RELAYMODE, comp->regs + DISP_OD_CFG);
mtk_dither_set(comp, bpc, DISP_OD_CFG);
}
static void mtk_od_start(struct mtk_ddp_comp *comp)
{
writel(1, comp->regs + DISP_OD_EN);
}
static void mtk_ufoe_start(struct mtk_ddp_comp *comp)
{
writel(UFO_BYPASS, comp->regs + DISP_REG_UFO_START);
}
static void mtk_aal_config(struct mtk_ddp_comp *comp, unsigned int w,
unsigned int h, unsigned int vrefresh,
unsigned int bpc)
{
writel(h << 16 | w, comp->regs + DISP_AAL_SIZE);
}
static void mtk_aal_start(struct mtk_ddp_comp *comp)
{
writel(AAL_EN, comp->regs + DISP_AAL_EN);
}
static void mtk_aal_stop(struct mtk_ddp_comp *comp)
{
writel_relaxed(0x0, comp->regs + DISP_AAL_EN);
}
static void mtk_gamma_config(struct mtk_ddp_comp *comp, unsigned int w,
unsigned int h, unsigned int vrefresh,
unsigned int bpc)
{
writel(h << 16 | w, comp->regs + DISP_GAMMA_SIZE);
mtk_dither_set(comp, bpc, DISP_GAMMA_CFG);
}
static void mtk_gamma_start(struct mtk_ddp_comp *comp)
{
writel(GAMMA_EN, comp->regs + DISP_GAMMA_EN);
}
static void mtk_gamma_stop(struct mtk_ddp_comp *comp)
{
writel_relaxed(0x0, comp->regs + DISP_GAMMA_EN);
}
static void mtk_gamma_set(struct mtk_ddp_comp *comp,
struct drm_crtc_state *state)
{
unsigned int i, reg;
struct drm_color_lut *lut;
void __iomem *lut_base;
u32 word;
if (state->gamma_lut) {
reg = readl(comp->regs + DISP_GAMMA_CFG);
reg = reg | GAMMA_LUT_EN;
writel(reg, comp->regs + DISP_GAMMA_CFG);
lut_base = comp->regs + DISP_GAMMA_LUT;
lut = (struct drm_color_lut *)state->gamma_lut->data;
for (i = 0; i < MTK_LUT_SIZE; i++) {
word = (((lut[i].red >> 6) & LUT_10BIT_MASK) << 20) +
(((lut[i].green >> 6) & LUT_10BIT_MASK) << 10) +
((lut[i].blue >> 6) & LUT_10BIT_MASK);
writel(word, (lut_base + i * 4));
}
}
}
static const struct mtk_ddp_comp_funcs ddp_aal = {
.gamma_set = mtk_gamma_set,
.config = mtk_aal_config,
.start = mtk_aal_start,
.stop = mtk_aal_stop,
};
static const struct mtk_ddp_comp_funcs ddp_gamma = {
.gamma_set = mtk_gamma_set,
.config = mtk_gamma_config,
.start = mtk_gamma_start,
.stop = mtk_gamma_stop,
};
static const struct mtk_ddp_comp_funcs ddp_od = {
.config = mtk_od_config,
.start = mtk_od_start,
};
static const struct mtk_ddp_comp_funcs ddp_ufoe = {
.start = mtk_ufoe_start,
};
static const char * const mtk_ddp_comp_stem[MTK_DDP_COMP_TYPE_MAX] = {
[MTK_DISP_OVL] = "ovl",
[MTK_DISP_RDMA] = "rdma",
[MTK_DISP_WDMA] = "wdma",
[MTK_DISP_COLOR] = "color",
[MTK_DISP_AAL] = "aal",
[MTK_DISP_GAMMA] = "gamma",
[MTK_DISP_UFOE] = "ufoe",
[MTK_DSI] = "dsi",
[MTK_DPI] = "dpi",
[MTK_DISP_PWM] = "pwm",
[MTK_DISP_MUTEX] = "mutex",
[MTK_DISP_OD] = "od",
[MTK_DISP_BLS] = "bls",
};
struct mtk_ddp_comp_match {
enum mtk_ddp_comp_type type;
int alias_id;
const struct mtk_ddp_comp_funcs *funcs;
};
static const struct mtk_ddp_comp_match mtk_ddp_matches[DDP_COMPONENT_ID_MAX] = {
[DDP_COMPONENT_AAL] = { MTK_DISP_AAL, 0, &ddp_aal },
[DDP_COMPONENT_BLS] = { MTK_DISP_BLS, 0, NULL },
[DDP_COMPONENT_COLOR0] = { MTK_DISP_COLOR, 0, NULL },
[DDP_COMPONENT_COLOR1] = { MTK_DISP_COLOR, 1, NULL },
[DDP_COMPONENT_DPI0] = { MTK_DPI, 0, NULL },
[DDP_COMPONENT_DSI0] = { MTK_DSI, 0, NULL },
[DDP_COMPONENT_DSI1] = { MTK_DSI, 1, NULL },
[DDP_COMPONENT_GAMMA] = { MTK_DISP_GAMMA, 0, &ddp_gamma },
[DDP_COMPONENT_OD] = { MTK_DISP_OD, 0, &ddp_od },
[DDP_COMPONENT_OVL0] = { MTK_DISP_OVL, 0, NULL },
[DDP_COMPONENT_OVL1] = { MTK_DISP_OVL, 1, NULL },
[DDP_COMPONENT_PWM0] = { MTK_DISP_PWM, 0, NULL },
[DDP_COMPONENT_RDMA0] = { MTK_DISP_RDMA, 0, NULL },
[DDP_COMPONENT_RDMA1] = { MTK_DISP_RDMA, 1, NULL },
[DDP_COMPONENT_RDMA2] = { MTK_DISP_RDMA, 2, NULL },
[DDP_COMPONENT_UFOE] = { MTK_DISP_UFOE, 0, &ddp_ufoe },
[DDP_COMPONENT_WDMA0] = { MTK_DISP_WDMA, 0, NULL },
[DDP_COMPONENT_WDMA1] = { MTK_DISP_WDMA, 1, NULL },
};
int mtk_ddp_comp_get_id(struct device_node *node,
enum mtk_ddp_comp_type comp_type)
{
int id = of_alias_get_id(node, mtk_ddp_comp_stem[comp_type]);
int i;
for (i = 0; i < ARRAY_SIZE(mtk_ddp_matches); i++) {
if (comp_type == mtk_ddp_matches[i].type &&
(id < 0 || id == mtk_ddp_matches[i].alias_id))
return i;
}
return -EINVAL;
}
int mtk_ddp_comp_init(struct device *dev, struct device_node *node,
struct mtk_ddp_comp *comp, enum mtk_ddp_comp_id comp_id,
const struct mtk_ddp_comp_funcs *funcs)
{
enum mtk_ddp_comp_type type;
struct device_node *larb_node;
struct platform_device *larb_pdev;
if (comp_id < 0 || comp_id >= DDP_COMPONENT_ID_MAX)
return -EINVAL;
type = mtk_ddp_matches[comp_id].type;
comp->id = comp_id;
comp->funcs = funcs ?: mtk_ddp_matches[comp_id].funcs;
if (comp_id == DDP_COMPONENT_BLS ||
comp_id == DDP_COMPONENT_DPI0 ||
comp_id == DDP_COMPONENT_DSI0 ||
comp_id == DDP_COMPONENT_PWM0) {
comp->regs = NULL;
comp->clk = NULL;
comp->irq = 0;
return 0;
}
comp->regs = of_iomap(node, 0);
comp->irq = of_irq_get(node, 0);
comp->clk = of_clk_get(node, 0);
if (IS_ERR(comp->clk))
comp->clk = NULL;
/* Only DMA capable components need the LARB property */
comp->larb_dev = NULL;
if (type != MTK_DISP_OVL &&
type != MTK_DISP_RDMA &&
type != MTK_DISP_WDMA)
return 0;
larb_node = of_parse_phandle(node, "mediatek,larb", 0);
if (!larb_node) {
dev_err(dev,
"Missing mediadek,larb phandle in %pOF node\n", node);
return -EINVAL;
}
larb_pdev = of_find_device_by_node(larb_node);
if (!larb_pdev) {
dev_warn(dev, "Waiting for larb device %pOF\n", larb_node);
of_node_put(larb_node);
return -EPROBE_DEFER;
}
of_node_put(larb_node);
comp->larb_dev = &larb_pdev->dev;
return 0;
}
int mtk_ddp_comp_register(struct drm_device *drm, struct mtk_ddp_comp *comp)
{
struct mtk_drm_private *private = drm->dev_private;
if (private->ddp_comp[comp->id])
return -EBUSY;
private->ddp_comp[comp->id] = comp;
return 0;
}
void mtk_ddp_comp_unregister(struct drm_device *drm, struct mtk_ddp_comp *comp)
{
struct mtk_drm_private *private = drm->dev_private;
private->ddp_comp[comp->id] = NULL;
}