/*
* Copyright (c) 2014 MediaTek Inc.
* Author: Jie Qiu <jie.qiu@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/clk-provider.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/types.h>
#define HDMI_CON0 0x00
#define RG_HDMITX_PLL_EN BIT(31)
#define RG_HDMITX_PLL_FBKDIV (0x7f << 24)
#define PLL_FBKDIV_SHIFT 24
#define RG_HDMITX_PLL_FBKSEL (0x3 << 22)
#define PLL_FBKSEL_SHIFT 22
#define RG_HDMITX_PLL_PREDIV (0x3 << 20)
#define PREDIV_SHIFT 20
#define RG_HDMITX_PLL_POSDIV (0x3 << 18)
#define POSDIV_SHIFT 18
#define RG_HDMITX_PLL_RST_DLY (0x3 << 16)
#define RG_HDMITX_PLL_IR (0xf << 12)
#define PLL_IR_SHIFT 12
#define RG_HDMITX_PLL_IC (0xf << 8)
#define PLL_IC_SHIFT 8
#define RG_HDMITX_PLL_BP (0xf << 4)
#define PLL_BP_SHIFT 4
#define RG_HDMITX_PLL_BR (0x3 << 2)
#define PLL_BR_SHIFT 2
#define RG_HDMITX_PLL_BC (0x3 << 0)
#define PLL_BC_SHIFT 0
#define HDMI_CON1 0x04
#define RG_HDMITX_PLL_DIVEN (0x7 << 29)
#define PLL_DIVEN_SHIFT 29
#define RG_HDMITX_PLL_AUTOK_EN BIT(28)
#define RG_HDMITX_PLL_AUTOK_KF (0x3 << 26)
#define RG_HDMITX_PLL_AUTOK_KS (0x3 << 24)
#define RG_HDMITX_PLL_AUTOK_LOAD BIT(23)
#define RG_HDMITX_PLL_BAND (0x3f << 16)
#define RG_HDMITX_PLL_REF_SEL BIT(15)
#define RG_HDMITX_PLL_BIAS_EN BIT(14)
#define RG_HDMITX_PLL_BIAS_LPF_EN BIT(13)
#define RG_HDMITX_PLL_TXDIV_EN BIT(12)
#define RG_HDMITX_PLL_TXDIV (0x3 << 10)
#define PLL_TXDIV_SHIFT 10
#define RG_HDMITX_PLL_LVROD_EN BIT(9)
#define RG_HDMITX_PLL_MONVC_EN BIT(8)
#define RG_HDMITX_PLL_MONCK_EN BIT(7)
#define RG_HDMITX_PLL_MONREF_EN BIT(6)
#define RG_HDMITX_PLL_TST_EN BIT(5)
#define RG_HDMITX_PLL_TST_CK_EN BIT(4)
#define RG_HDMITX_PLL_TST_SEL (0xf << 0)
#define HDMI_CON2 0x08
#define RGS_HDMITX_PLL_AUTOK_BAND (0x7f << 8)
#define RGS_HDMITX_PLL_AUTOK_FAIL BIT(1)
#define RG_HDMITX_EN_TX_CKLDO BIT(0)
#define HDMI_CON3 0x0c
#define RG_HDMITX_SER_EN (0xf << 28)
#define RG_HDMITX_PRD_EN (0xf << 24)
#define RG_HDMITX_PRD_IMP_EN (0xf << 20)
#define RG_HDMITX_DRV_EN (0xf << 16)
#define RG_HDMITX_DRV_IMP_EN (0xf << 12)
#define DRV_IMP_EN_SHIFT 12
#define RG_HDMITX_MHLCK_FORCE BIT(10)
#define RG_HDMITX_MHLCK_PPIX_EN BIT(9)
#define RG_HDMITX_MHLCK_EN BIT(8)
#define RG_HDMITX_SER_DIN_SEL (0xf << 4)
#define RG_HDMITX_SER_5T1_BIST_EN BIT(3)
#define RG_HDMITX_SER_BIST_TOG BIT(2)
#define RG_HDMITX_SER_DIN_TOG BIT(1)
#define RG_HDMITX_SER_CLKDIG_INV BIT(0)
#define HDMI_CON4 0x10
#define RG_HDMITX_PRD_IBIAS_CLK (0xf << 24)
#define RG_HDMITX_PRD_IBIAS_D2 (0xf << 16)
#define RG_HDMITX_PRD_IBIAS_D1 (0xf << 8)
#define RG_HDMITX_PRD_IBIAS_D0 (0xf << 0)
#define PRD_IBIAS_CLK_SHIFT 24
#define PRD_IBIAS_D2_SHIFT 16
#define PRD_IBIAS_D1_SHIFT 8
#define PRD_IBIAS_D0_SHIFT 0
#define HDMI_CON5 0x14
#define RG_HDMITX_DRV_IBIAS_CLK (0x3f << 24)
#define RG_HDMITX_DRV_IBIAS_D2 (0x3f << 16)
#define RG_HDMITX_DRV_IBIAS_D1 (0x3f << 8)
#define RG_HDMITX_DRV_IBIAS_D0 (0x3f << 0)
#define DRV_IBIAS_CLK_SHIFT 24
#define DRV_IBIAS_D2_SHIFT 16
#define DRV_IBIAS_D1_SHIFT 8
#define DRV_IBIAS_D0_SHIFT 0
#define HDMI_CON6 0x18
#define RG_HDMITX_DRV_IMP_CLK (0x3f << 24)
#define RG_HDMITX_DRV_IMP_D2 (0x3f << 16)
#define RG_HDMITX_DRV_IMP_D1 (0x3f << 8)
#define RG_HDMITX_DRV_IMP_D0 (0x3f << 0)
#define DRV_IMP_CLK_SHIFT 24
#define DRV_IMP_D2_SHIFT 16
#define DRV_IMP_D1_SHIFT 8
#define DRV_IMP_D0_SHIFT 0
#define HDMI_CON7 0x1c
#define RG_HDMITX_MHLCK_DRV_IBIAS (0x1f << 27)
#define RG_HDMITX_SER_DIN (0x3ff << 16)
#define RG_HDMITX_CHLDC_TST (0xf << 12)
#define RG_HDMITX_CHLCK_TST (0xf << 8)
#define RG_HDMITX_RESERVE (0xff << 0)
#define HDMI_CON8 0x20
#define RGS_HDMITX_2T1_LEV (0xf << 16)
#define RGS_HDMITX_2T1_EDG (0xf << 12)
#define RGS_HDMITX_5T1_LEV (0xf << 8)
#define RGS_HDMITX_5T1_EDG (0xf << 4)
#define RGS_HDMITX_PLUG_TST BIT(0)
struct mtk_hdmi_phy {
void __iomem *regs;
struct device *dev;
struct clk *pll;
struct clk_hw pll_hw;
unsigned long pll_rate;
u8 drv_imp_clk;
u8 drv_imp_d2;
u8 drv_imp_d1;
u8 drv_imp_d0;
u32 ibias;
u32 ibias_up;
};
static const u8 PREDIV[3][4] = {
{0x0, 0x0, 0x0, 0x0}, /* 27Mhz */
{0x1, 0x1, 0x1, 0x1}, /* 74Mhz */
{0x1, 0x1, 0x1, 0x1} /* 148Mhz */
};
static const u8 TXDIV[3][4] = {
{0x3, 0x3, 0x3, 0x2}, /* 27Mhz */
{0x2, 0x1, 0x1, 0x1}, /* 74Mhz */
{0x1, 0x0, 0x0, 0x0} /* 148Mhz */
};
static const u8 FBKSEL[3][4] = {
{0x1, 0x1, 0x1, 0x1}, /* 27Mhz */
{0x1, 0x0, 0x1, 0x1}, /* 74Mhz */
{0x1, 0x0, 0x1, 0x1} /* 148Mhz */
};
static const u8 FBKDIV[3][4] = {
{19, 24, 29, 19}, /* 27Mhz */
{19, 24, 14, 19}, /* 74Mhz */
{19, 24, 14, 19} /* 148Mhz */
};
static const u8 DIVEN[3][4] = {
{0x2, 0x1, 0x1, 0x2}, /* 27Mhz */
{0x2, 0x2, 0x2, 0x2}, /* 74Mhz */
{0x2, 0x2, 0x2, 0x2} /* 148Mhz */
};
static const u8 HTPLLBP[3][4] = {
{0xc, 0xc, 0x8, 0xc}, /* 27Mhz */
{0xc, 0xf, 0xf, 0xc}, /* 74Mhz */
{0xc, 0xf, 0xf, 0xc} /* 148Mhz */
};
static const u8 HTPLLBC[3][4] = {
{0x2, 0x3, 0x3, 0x2}, /* 27Mhz */
{0x2, 0x3, 0x3, 0x2}, /* 74Mhz */
{0x2, 0x3, 0x3, 0x2} /* 148Mhz */
};
static const u8 HTPLLBR[3][4] = {
{0x1, 0x1, 0x0, 0x1}, /* 27Mhz */
{0x1, 0x2, 0x2, 0x1}, /* 74Mhz */
{0x1, 0x2, 0x2, 0x1} /* 148Mhz */
};
static void mtk_hdmi_phy_clear_bits(struct mtk_hdmi_phy *hdmi_phy, u32 offset,
u32 bits)
{
void __iomem *reg = hdmi_phy->regs + offset;
u32 tmp;
tmp = readl(reg);
tmp &= ~bits;
writel(tmp, reg);
}
static void mtk_hdmi_phy_set_bits(struct mtk_hdmi_phy *hdmi_phy, u32 offset,
u32 bits)
{
void __iomem *reg = hdmi_phy->regs + offset;
u32 tmp;
tmp = readl(reg);
tmp |= bits;
writel(tmp, reg);
}
static void mtk_hdmi_phy_mask(struct mtk_hdmi_phy *hdmi_phy, u32 offset,
u32 val, u32 mask)
{
void __iomem *reg = hdmi_phy->regs + offset;
u32 tmp;
tmp = readl(reg);
tmp = (tmp & ~mask) | (val & mask);
writel(tmp, reg);
}
static inline struct mtk_hdmi_phy *to_mtk_hdmi_phy(struct clk_hw *hw)
{
return container_of(hw, struct mtk_hdmi_phy, pll_hw);
}
static int mtk_hdmi_pll_prepare(struct clk_hw *hw)
{
struct mtk_hdmi_phy *hdmi_phy = to_mtk_hdmi_phy(hw);
dev_dbg(hdmi_phy->dev, "%s\n", __func__);
mtk_hdmi_phy_set_bits(hdmi_phy, HDMI_CON1, RG_HDMITX_PLL_AUTOK_EN);
mtk_hdmi_phy_set_bits(hdmi_phy, HDMI_CON0, RG_HDMITX_PLL_POSDIV);
mtk_hdmi_phy_clear_bits(hdmi_phy, HDMI_CON3, RG_HDMITX_MHLCK_EN);
mtk_hdmi_phy_set_bits(hdmi_phy, HDMI_CON1, RG_HDMITX_PLL_BIAS_EN);
usleep_range(100, 150);
mtk_hdmi_phy_set_bits(hdmi_phy, HDMI_CON0, RG_HDMITX_PLL_EN);
usleep_range(100, 150);
mtk_hdmi_phy_set_bits(hdmi_phy, HDMI_CON1, RG_HDMITX_PLL_BIAS_LPF_EN);
mtk_hdmi_phy_set_bits(hdmi_phy, HDMI_CON1, RG_HDMITX_PLL_TXDIV_EN);
return 0;
}
static void mtk_hdmi_pll_unprepare(struct clk_hw *hw)
{
struct mtk_hdmi_phy *hdmi_phy = to_mtk_hdmi_phy(hw);
dev_dbg(hdmi_phy->dev, "%s\n", __func__);
mtk_hdmi_phy_clear_bits(hdmi_phy, HDMI_CON1, RG_HDMITX_PLL_TXDIV_EN);
mtk_hdmi_phy_clear_bits(hdmi_phy, HDMI_CON1, RG_HDMITX_PLL_BIAS_LPF_EN);
usleep_range(100, 150);
mtk_hdmi_phy_clear_bits(hdmi_phy, HDMI_CON0, RG_HDMITX_PLL_EN);
usleep_range(100, 150);
mtk_hdmi_phy_clear_bits(hdmi_phy, HDMI_CON1, RG_HDMITX_PLL_BIAS_EN);
mtk_hdmi_phy_clear_bits(hdmi_phy, HDMI_CON0, RG_HDMITX_PLL_POSDIV);
mtk_hdmi_phy_clear_bits(hdmi_phy, HDMI_CON1, RG_HDMITX_PLL_AUTOK_EN);
usleep_range(100, 150);
}
static int mtk_hdmi_pll_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct mtk_hdmi_phy *hdmi_phy = to_mtk_hdmi_phy(hw);
unsigned int pre_div;
unsigned int div;
unsigned int pre_ibias;
unsigned int hdmi_ibias;
unsigned int imp_en;
dev_dbg(hdmi_phy->dev, "%s: %lu Hz, parent: %lu Hz\n", __func__,
rate, parent_rate);
if (rate <= 27000000) {
pre_div = 0;
div = 3;
} else if (rate <= 74250000) {
pre_div = 1;
div = 2;
} else {
pre_div = 1;
div = 1;
}
mtk_hdmi_phy_mask(hdmi_phy, HDMI_CON0,
(pre_div << PREDIV_SHIFT), RG_HDMITX_PLL_PREDIV);
mtk_hdmi_phy_set_bits(hdmi_phy, HDMI_CON0, RG_HDMITX_PLL_POSDIV);
mtk_hdmi_phy_mask(hdmi_phy, HDMI_CON0,
(0x1 << PLL_IC_SHIFT) | (0x1 << PLL_IR_SHIFT),
RG_HDMITX_PLL_IC | RG_HDMITX_PLL_IR);
mtk_hdmi_phy_mask(hdmi_phy, HDMI_CON1,
(div << PLL_TXDIV_SHIFT), RG_HDMITX_PLL_TXDIV);
mtk_hdmi_phy_mask(hdmi_phy, HDMI_CON0,
(0x1 << PLL_FBKSEL_SHIFT) | (19 << PLL_FBKDIV_SHIFT),
RG_HDMITX_PLL_FBKSEL | RG_HDMITX_PLL_FBKDIV);
mtk_hdmi_phy_mask(hdmi_phy, HDMI_CON1,
(0x2 << PLL_DIVEN_SHIFT), RG_HDMITX_PLL_DIVEN);
mtk_hdmi_phy_mask(hdmi_phy, HDMI_CON0,
(0xc << PLL_BP_SHIFT) | (0x2 << PLL_BC_SHIFT) |
(0x1 << PLL_BR_SHIFT),
RG_HDMITX_PLL_BP | RG_HDMITX_PLL_BC |
RG_HDMITX_PLL_BR);
if (rate < 165000000) {
mtk_hdmi_phy_clear_bits(hdmi_phy, HDMI_CON3,
RG_HDMITX_PRD_IMP_EN);
pre_ibias = 0x3;
imp_en = 0x0;
hdmi_ibias = hdmi_phy->ibias;
} else {
mtk_hdmi_phy_set_bits(hdmi_phy, HDMI_CON3,
RG_HDMITX_PRD_IMP_EN);
pre_ibias = 0x6;
imp_en = 0xf;
hdmi_ibias = hdmi_phy->ibias_up;
}
mtk_hdmi_phy_mask(hdmi_phy, HDMI_CON4,
(pre_ibias << PRD_IBIAS_CLK_SHIFT) |
(pre_ibias << PRD_IBIAS_D2_SHIFT) |
(pre_ibias << PRD_IBIAS_D1_SHIFT) |
(pre_ibias << PRD_IBIAS_D0_SHIFT),
RG_HDMITX_PRD_IBIAS_CLK |
RG_HDMITX_PRD_IBIAS_D2 |
RG_HDMITX_PRD_IBIAS_D1 |
RG_HDMITX_PRD_IBIAS_D0);
mtk_hdmi_phy_mask(hdmi_phy, HDMI_CON3,
(imp_en << DRV_IMP_EN_SHIFT),
RG_HDMITX_DRV_IMP_EN);
mtk_hdmi_phy_mask(hdmi_phy, HDMI_CON6,
(hdmi_phy->drv_imp_clk << DRV_IMP_CLK_SHIFT) |
(hdmi_phy->drv_imp_d2 << DRV_IMP_D2_SHIFT) |
(hdmi_phy->drv_imp_d1 << DRV_IMP_D1_SHIFT) |
(hdmi_phy->drv_imp_d0 << DRV_IMP_D0_SHIFT),
RG_HDMITX_DRV_IMP_CLK | RG_HDMITX_DRV_IMP_D2 |
RG_HDMITX_DRV_IMP_D1 | RG_HDMITX_DRV_IMP_D0);
mtk_hdmi_phy_mask(hdmi_phy, HDMI_CON5,
(hdmi_ibias << DRV_IBIAS_CLK_SHIFT) |
(hdmi_ibias << DRV_IBIAS_D2_SHIFT) |
(hdmi_ibias << DRV_IBIAS_D1_SHIFT) |
(hdmi_ibias << DRV_IBIAS_D0_SHIFT),
RG_HDMITX_DRV_IBIAS_CLK |
RG_HDMITX_DRV_IBIAS_D2 |
RG_HDMITX_DRV_IBIAS_D1 |
RG_HDMITX_DRV_IBIAS_D0);
return 0;
}
static long mtk_hdmi_pll_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *parent_rate)
{
struct mtk_hdmi_phy *hdmi_phy = to_mtk_hdmi_phy(hw);
hdmi_phy->pll_rate = rate;
if (rate <= 74250000)
*parent_rate = rate;
else
*parent_rate = rate / 2;
return rate;
}
static unsigned long mtk_hdmi_pll_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct mtk_hdmi_phy *hdmi_phy = to_mtk_hdmi_phy(hw);
return hdmi_phy->pll_rate;
}
static const struct clk_ops mtk_hdmi_pll_ops = {
.prepare = mtk_hdmi_pll_prepare,
.unprepare = mtk_hdmi_pll_unprepare,
.set_rate = mtk_hdmi_pll_set_rate,
.round_rate = mtk_hdmi_pll_round_rate,
.recalc_rate = mtk_hdmi_pll_recalc_rate,
};
static void mtk_hdmi_phy_enable_tmds(struct mtk_hdmi_phy *hdmi_phy)
{
mtk_hdmi_phy_set_bits(hdmi_phy, HDMI_CON3,
RG_HDMITX_SER_EN | RG_HDMITX_PRD_EN |
RG_HDMITX_DRV_EN);
usleep_range(100, 150);
}
static void mtk_hdmi_phy_disable_tmds(struct mtk_hdmi_phy *hdmi_phy)
{
mtk_hdmi_phy_clear_bits(hdmi_phy, HDMI_CON3,
RG_HDMITX_DRV_EN | RG_HDMITX_PRD_EN |
RG_HDMITX_SER_EN);
}
static int mtk_hdmi_phy_power_on(struct phy *phy)
{
struct mtk_hdmi_phy *hdmi_phy = phy_get_drvdata(phy);
int ret;
ret = clk_prepare_enable(hdmi_phy->pll);
if (ret < 0)
return ret;
mtk_hdmi_phy_enable_tmds(hdmi_phy);
return 0;
}
static int mtk_hdmi_phy_power_off(struct phy *phy)
{
struct mtk_hdmi_phy *hdmi_phy = phy_get_drvdata(phy);
mtk_hdmi_phy_disable_tmds(hdmi_phy);
clk_disable_unprepare(hdmi_phy->pll);
return 0;
}
static const struct phy_ops mtk_hdmi_phy_ops = {
.power_on = mtk_hdmi_phy_power_on,
.power_off = mtk_hdmi_phy_power_off,
.owner = THIS_MODULE,
};
static int mtk_hdmi_phy_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct mtk_hdmi_phy *hdmi_phy;
struct resource *mem;
struct clk *ref_clk;
const char *ref_clk_name;
struct clk_init_data clk_init = {
.ops = &mtk_hdmi_pll_ops,
.num_parents = 1,
.parent_names = (const char * const *)&ref_clk_name,
.flags = CLK_SET_RATE_PARENT | CLK_SET_RATE_GATE,
};
struct phy *phy;
struct phy_provider *phy_provider;
int ret;
hdmi_phy = devm_kzalloc(dev, sizeof(*hdmi_phy), GFP_KERNEL);
if (!hdmi_phy)
return -ENOMEM;
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
hdmi_phy->regs = devm_ioremap_resource(dev, mem);
if (IS_ERR(hdmi_phy->regs)) {
ret = PTR_ERR(hdmi_phy->regs);
dev_err(dev, "Failed to get memory resource: %d\n", ret);
return ret;
}
ref_clk = devm_clk_get(dev, "pll_ref");
if (IS_ERR(ref_clk)) {
ret = PTR_ERR(ref_clk);
dev_err(&pdev->dev, "Failed to get PLL reference clock: %d\n",
ret);
return ret;
}
ref_clk_name = __clk_get_name(ref_clk);
ret = of_property_read_string(dev->of_node, "clock-output-names",
&clk_init.name);
if (ret < 0) {
dev_err(dev, "Failed to read clock-output-names: %d\n", ret);
return ret;
}
hdmi_phy->pll_hw.init = &clk_init;
hdmi_phy->pll = devm_clk_register(dev, &hdmi_phy->pll_hw);
if (IS_ERR(hdmi_phy->pll)) {
ret = PTR_ERR(hdmi_phy->pll);
dev_err(dev, "Failed to register PLL: %d\n", ret);
return ret;
}
ret = of_property_read_u32(dev->of_node, "mediatek,ibias",
&hdmi_phy->ibias);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to get ibias: %d\n", ret);
return ret;
}
ret = of_property_read_u32(dev->of_node, "mediatek,ibias_up",
&hdmi_phy->ibias_up);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to get ibias up: %d\n", ret);
return ret;
}
dev_info(dev, "Using default TX DRV impedance: 4.2k/36\n");
hdmi_phy->drv_imp_clk = 0x30;
hdmi_phy->drv_imp_d2 = 0x30;
hdmi_phy->drv_imp_d1 = 0x30;
hdmi_phy->drv_imp_d0 = 0x30;
phy = devm_phy_create(dev, NULL, &mtk_hdmi_phy_ops);
if (IS_ERR(phy)) {
dev_err(dev, "Failed to create HDMI PHY\n");
return PTR_ERR(phy);
}
phy_set_drvdata(phy, hdmi_phy);
phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
if (IS_ERR(phy_provider))
return PTR_ERR(phy_provider);
hdmi_phy->dev = dev;
return of_clk_add_provider(dev->of_node, of_clk_src_simple_get,
hdmi_phy->pll);
}
static int mtk_hdmi_phy_remove(struct platform_device *pdev)
{
return 0;
}
static const struct of_device_id mtk_hdmi_phy_match[] = {
{ .compatible = "mediatek,mt8173-hdmi-phy", },
{},
};
struct platform_driver mtk_hdmi_phy_driver = {
.probe = mtk_hdmi_phy_probe,
.remove = mtk_hdmi_phy_remove,
.driver = {
.name = "mediatek-hdmi-phy",
.of_match_table = mtk_hdmi_phy_match,
},
};
MODULE_AUTHOR("Jie Qiu <jie.qiu@mediatek.com>");
MODULE_DESCRIPTION("MediaTek MT8173 HDMI PHY Driver");
MODULE_LICENSE("GPL v2");
