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133add5b5a
Most of the Allwinner SoCs since the A31 share the same MIPI-DSI controller. While that controller is mostly undocumented, the code is out there and has been cleaned up in order to be integrated into DRM. However, there's still some dark areas that are a bit unclear about how the block exactly operates. Reviewed-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com> Link: https://patchwork.freedesktop.org/patch/msgid/ad9e6224fced87c0889ddd2765d1942610061f72.1522835818.git-series.maxime.ripard@bootlin.com
292 lines
8.3 KiB
C
292 lines
8.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2016 Allwinnertech Co., Ltd.
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* Copyright (C) 2017-2018 Bootlin
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*
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* Maxime Ripard <maxime.ripard@free-electrons.com>
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*/
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#include <linux/bitops.h>
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#include <linux/clk.h>
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#include <linux/of_address.h>
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#include <linux/regmap.h>
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#include <linux/reset.h>
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#include "sun6i_mipi_dsi.h"
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#define SUN6I_DPHY_GCTL_REG 0x00
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#define SUN6I_DPHY_GCTL_LANE_NUM(n) ((((n) - 1) & 3) << 4)
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#define SUN6I_DPHY_GCTL_EN BIT(0)
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#define SUN6I_DPHY_TX_CTL_REG 0x04
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#define SUN6I_DPHY_TX_CTL_HS_TX_CLK_CONT BIT(28)
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#define SUN6I_DPHY_TX_TIME0_REG 0x10
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#define SUN6I_DPHY_TX_TIME0_HS_TRAIL(n) (((n) & 0xff) << 24)
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#define SUN6I_DPHY_TX_TIME0_HS_PREPARE(n) (((n) & 0xff) << 16)
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#define SUN6I_DPHY_TX_TIME0_LP_CLK_DIV(n) ((n) & 0xff)
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#define SUN6I_DPHY_TX_TIME1_REG 0x14
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#define SUN6I_DPHY_TX_TIME1_CLK_POST(n) (((n) & 0xff) << 24)
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#define SUN6I_DPHY_TX_TIME1_CLK_PRE(n) (((n) & 0xff) << 16)
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#define SUN6I_DPHY_TX_TIME1_CLK_ZERO(n) (((n) & 0xff) << 8)
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#define SUN6I_DPHY_TX_TIME1_CLK_PREPARE(n) ((n) & 0xff)
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#define SUN6I_DPHY_TX_TIME2_REG 0x18
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#define SUN6I_DPHY_TX_TIME2_CLK_TRAIL(n) ((n) & 0xff)
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#define SUN6I_DPHY_TX_TIME3_REG 0x1c
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#define SUN6I_DPHY_TX_TIME4_REG 0x20
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#define SUN6I_DPHY_TX_TIME4_HS_TX_ANA1(n) (((n) & 0xff) << 8)
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#define SUN6I_DPHY_TX_TIME4_HS_TX_ANA0(n) ((n) & 0xff)
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#define SUN6I_DPHY_ANA0_REG 0x4c
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#define SUN6I_DPHY_ANA0_REG_PWS BIT(31)
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#define SUN6I_DPHY_ANA0_REG_DMPC BIT(28)
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#define SUN6I_DPHY_ANA0_REG_DMPD(n) (((n) & 0xf) << 24)
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#define SUN6I_DPHY_ANA0_REG_SLV(n) (((n) & 7) << 12)
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#define SUN6I_DPHY_ANA0_REG_DEN(n) (((n) & 0xf) << 8)
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#define SUN6I_DPHY_ANA1_REG 0x50
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#define SUN6I_DPHY_ANA1_REG_VTTMODE BIT(31)
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#define SUN6I_DPHY_ANA1_REG_CSMPS(n) (((n) & 3) << 28)
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#define SUN6I_DPHY_ANA1_REG_SVTT(n) (((n) & 0xf) << 24)
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#define SUN6I_DPHY_ANA2_REG 0x54
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#define SUN6I_DPHY_ANA2_EN_P2S_CPU(n) (((n) & 0xf) << 24)
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#define SUN6I_DPHY_ANA2_EN_P2S_CPU_MASK GENMASK(27, 24)
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#define SUN6I_DPHY_ANA2_EN_CK_CPU BIT(4)
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#define SUN6I_DPHY_ANA2_REG_ENIB BIT(1)
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#define SUN6I_DPHY_ANA3_REG 0x58
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#define SUN6I_DPHY_ANA3_EN_VTTD(n) (((n) & 0xf) << 28)
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#define SUN6I_DPHY_ANA3_EN_VTTD_MASK GENMASK(31, 28)
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#define SUN6I_DPHY_ANA3_EN_VTTC BIT(27)
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#define SUN6I_DPHY_ANA3_EN_DIV BIT(26)
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#define SUN6I_DPHY_ANA3_EN_LDOC BIT(25)
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#define SUN6I_DPHY_ANA3_EN_LDOD BIT(24)
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#define SUN6I_DPHY_ANA3_EN_LDOR BIT(18)
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#define SUN6I_DPHY_ANA4_REG 0x5c
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#define SUN6I_DPHY_ANA4_REG_DMPLVC BIT(24)
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#define SUN6I_DPHY_ANA4_REG_DMPLVD(n) (((n) & 0xf) << 20)
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#define SUN6I_DPHY_ANA4_REG_CKDV(n) (((n) & 0x1f) << 12)
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#define SUN6I_DPHY_ANA4_REG_TMSC(n) (((n) & 3) << 10)
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#define SUN6I_DPHY_ANA4_REG_TMSD(n) (((n) & 3) << 8)
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#define SUN6I_DPHY_ANA4_REG_TXDNSC(n) (((n) & 3) << 6)
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#define SUN6I_DPHY_ANA4_REG_TXDNSD(n) (((n) & 3) << 4)
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#define SUN6I_DPHY_ANA4_REG_TXPUSC(n) (((n) & 3) << 2)
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#define SUN6I_DPHY_ANA4_REG_TXPUSD(n) ((n) & 3)
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#define SUN6I_DPHY_DBG5_REG 0xf4
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int sun6i_dphy_init(struct sun6i_dphy *dphy, unsigned int lanes)
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{
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reset_control_deassert(dphy->reset);
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clk_prepare_enable(dphy->mod_clk);
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clk_set_rate_exclusive(dphy->mod_clk, 150000000);
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regmap_write(dphy->regs, SUN6I_DPHY_TX_CTL_REG,
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SUN6I_DPHY_TX_CTL_HS_TX_CLK_CONT);
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regmap_write(dphy->regs, SUN6I_DPHY_TX_TIME0_REG,
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SUN6I_DPHY_TX_TIME0_LP_CLK_DIV(14) |
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SUN6I_DPHY_TX_TIME0_HS_PREPARE(6) |
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SUN6I_DPHY_TX_TIME0_HS_TRAIL(10));
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regmap_write(dphy->regs, SUN6I_DPHY_TX_TIME1_REG,
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SUN6I_DPHY_TX_TIME1_CLK_PREPARE(7) |
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SUN6I_DPHY_TX_TIME1_CLK_ZERO(50) |
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SUN6I_DPHY_TX_TIME1_CLK_PRE(3) |
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SUN6I_DPHY_TX_TIME1_CLK_POST(10));
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regmap_write(dphy->regs, SUN6I_DPHY_TX_TIME2_REG,
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SUN6I_DPHY_TX_TIME2_CLK_TRAIL(30));
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regmap_write(dphy->regs, SUN6I_DPHY_TX_TIME3_REG, 0);
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regmap_write(dphy->regs, SUN6I_DPHY_TX_TIME4_REG,
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SUN6I_DPHY_TX_TIME4_HS_TX_ANA0(3) |
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SUN6I_DPHY_TX_TIME4_HS_TX_ANA1(3));
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regmap_write(dphy->regs, SUN6I_DPHY_GCTL_REG,
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SUN6I_DPHY_GCTL_LANE_NUM(lanes) |
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SUN6I_DPHY_GCTL_EN);
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return 0;
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}
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int sun6i_dphy_power_on(struct sun6i_dphy *dphy, unsigned int lanes)
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{
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u8 lanes_mask = GENMASK(lanes - 1, 0);
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regmap_write(dphy->regs, SUN6I_DPHY_ANA0_REG,
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SUN6I_DPHY_ANA0_REG_PWS |
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SUN6I_DPHY_ANA0_REG_DMPC |
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SUN6I_DPHY_ANA0_REG_SLV(7) |
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SUN6I_DPHY_ANA0_REG_DMPD(lanes_mask) |
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SUN6I_DPHY_ANA0_REG_DEN(lanes_mask));
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regmap_write(dphy->regs, SUN6I_DPHY_ANA1_REG,
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SUN6I_DPHY_ANA1_REG_CSMPS(1) |
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SUN6I_DPHY_ANA1_REG_SVTT(7));
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regmap_write(dphy->regs, SUN6I_DPHY_ANA4_REG,
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SUN6I_DPHY_ANA4_REG_CKDV(1) |
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SUN6I_DPHY_ANA4_REG_TMSC(1) |
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SUN6I_DPHY_ANA4_REG_TMSD(1) |
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SUN6I_DPHY_ANA4_REG_TXDNSC(1) |
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SUN6I_DPHY_ANA4_REG_TXDNSD(1) |
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SUN6I_DPHY_ANA4_REG_TXPUSC(1) |
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SUN6I_DPHY_ANA4_REG_TXPUSD(1) |
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SUN6I_DPHY_ANA4_REG_DMPLVC |
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SUN6I_DPHY_ANA4_REG_DMPLVD(lanes_mask));
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regmap_write(dphy->regs, SUN6I_DPHY_ANA2_REG,
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SUN6I_DPHY_ANA2_REG_ENIB);
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udelay(5);
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regmap_write(dphy->regs, SUN6I_DPHY_ANA3_REG,
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SUN6I_DPHY_ANA3_EN_LDOR |
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SUN6I_DPHY_ANA3_EN_LDOC |
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SUN6I_DPHY_ANA3_EN_LDOD);
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udelay(1);
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regmap_update_bits(dphy->regs, SUN6I_DPHY_ANA3_REG,
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SUN6I_DPHY_ANA3_EN_VTTC |
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SUN6I_DPHY_ANA3_EN_VTTD_MASK,
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SUN6I_DPHY_ANA3_EN_VTTC |
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SUN6I_DPHY_ANA3_EN_VTTD(lanes_mask));
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udelay(1);
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regmap_update_bits(dphy->regs, SUN6I_DPHY_ANA3_REG,
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SUN6I_DPHY_ANA3_EN_DIV,
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SUN6I_DPHY_ANA3_EN_DIV);
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udelay(1);
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regmap_update_bits(dphy->regs, SUN6I_DPHY_ANA2_REG,
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SUN6I_DPHY_ANA2_EN_CK_CPU,
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SUN6I_DPHY_ANA2_EN_CK_CPU);
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udelay(1);
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regmap_update_bits(dphy->regs, SUN6I_DPHY_ANA1_REG,
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SUN6I_DPHY_ANA1_REG_VTTMODE,
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SUN6I_DPHY_ANA1_REG_VTTMODE);
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regmap_update_bits(dphy->regs, SUN6I_DPHY_ANA2_REG,
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SUN6I_DPHY_ANA2_EN_P2S_CPU_MASK,
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SUN6I_DPHY_ANA2_EN_P2S_CPU(lanes_mask));
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return 0;
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}
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int sun6i_dphy_power_off(struct sun6i_dphy *dphy)
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{
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regmap_update_bits(dphy->regs, SUN6I_DPHY_ANA1_REG,
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SUN6I_DPHY_ANA1_REG_VTTMODE, 0);
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return 0;
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}
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int sun6i_dphy_exit(struct sun6i_dphy *dphy)
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{
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clk_rate_exclusive_put(dphy->mod_clk);
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clk_disable_unprepare(dphy->mod_clk);
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reset_control_assert(dphy->reset);
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return 0;
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}
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static struct regmap_config sun6i_dphy_regmap_config = {
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.reg_bits = 32,
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.val_bits = 32,
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.reg_stride = 4,
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.max_register = SUN6I_DPHY_DBG5_REG,
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.name = "mipi-dphy",
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};
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static const struct of_device_id sun6i_dphy_of_table[] = {
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{ .compatible = "allwinner,sun6i-a31-mipi-dphy" },
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{ }
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};
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int sun6i_dphy_probe(struct sun6i_dsi *dsi, struct device_node *node)
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{
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struct sun6i_dphy *dphy;
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struct resource res;
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void __iomem *regs;
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int ret;
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if (!of_match_node(sun6i_dphy_of_table, node)) {
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dev_err(dsi->dev, "Incompatible D-PHY\n");
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return -EINVAL;
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}
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dphy = devm_kzalloc(dsi->dev, sizeof(*dphy), GFP_KERNEL);
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if (!dphy)
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return -ENOMEM;
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ret = of_address_to_resource(node, 0, &res);
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if (ret) {
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dev_err(dsi->dev, "phy: Couldn't get our resources\n");
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return ret;
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}
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regs = devm_ioremap_resource(dsi->dev, &res);
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if (IS_ERR(regs)) {
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dev_err(dsi->dev, "Couldn't map the DPHY encoder registers\n");
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return PTR_ERR(regs);
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}
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dphy->regs = devm_regmap_init_mmio(dsi->dev, regs,
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&sun6i_dphy_regmap_config);
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if (IS_ERR(dphy->regs)) {
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dev_err(dsi->dev, "Couldn't create the DPHY encoder regmap\n");
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return PTR_ERR(dphy->regs);
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}
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dphy->reset = of_reset_control_get_shared(node, NULL);
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if (IS_ERR(dphy->reset)) {
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dev_err(dsi->dev, "Couldn't get our reset line\n");
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return PTR_ERR(dphy->reset);
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}
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dphy->bus_clk = of_clk_get_by_name(node, "bus");
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if (IS_ERR(dphy->bus_clk)) {
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dev_err(dsi->dev, "Couldn't get the DPHY bus clock\n");
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ret = PTR_ERR(dphy->bus_clk);
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goto err_free_reset;
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}
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regmap_mmio_attach_clk(dphy->regs, dphy->bus_clk);
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dphy->mod_clk = of_clk_get_by_name(node, "mod");
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if (IS_ERR(dphy->mod_clk)) {
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dev_err(dsi->dev, "Couldn't get the DPHY mod clock\n");
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ret = PTR_ERR(dphy->mod_clk);
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goto err_free_bus;
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}
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dsi->dphy = dphy;
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return 0;
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err_free_bus:
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regmap_mmio_detach_clk(dphy->regs);
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clk_put(dphy->bus_clk);
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err_free_reset:
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reset_control_put(dphy->reset);
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return ret;
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}
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int sun6i_dphy_remove(struct sun6i_dsi *dsi)
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{
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struct sun6i_dphy *dphy = dsi->dphy;
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regmap_mmio_detach_clk(dphy->regs);
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clk_put(dphy->mod_clk);
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clk_put(dphy->bus_clk);
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reset_control_put(dphy->reset);
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return 0;
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}
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