drivers/gpu/drm/meson/meson_vclk.c

   1 /*
   2  * Copyright (C) 2016 BayLibre, SAS
   3  * Author: Neil Armstrong <narmstrong@baylibre.com>
   4  * Copyright (C) 2015 Amlogic, Inc. All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation; either version 2 of the
   9  * License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <drm/drmP.h>
  23 #include "meson_drv.h"
  24 #include "meson_vclk.h"
  25
  26 /*
  27  * VCLK is the "Pixel Clock" frequency generator from a dedicated PLL.
  28  * We handle the following encodings :
  29  * - CVBS 27MHz generator via the VCLK2 to the VENCI and VDAC blocks
  30  *
  31  * What is missing :
  32  * - HDMI Pixel Clocks generation
  33  */
  34
  35 /* HHI Registers */
  36 #define HHI_VID_PLL_CLK_DIV     0x1a0 /* 0x68 offset in data sheet */
  37 #define VID_PLL_EN              BIT(19)
  38 #define VID_PLL_BYPASS          BIT(18)
  39 #define VID_PLL_PRESET          BIT(15)
  40 #define HHI_VIID_CLK_DIV        0x128 /* 0x4a offset in data sheet */
  41 #define VCLK2_DIV_MASK          0xff
  42 #define VCLK2_DIV_EN            BIT(16)
  43 #define VCLK2_DIV_RESET         BIT(17)
  44 #define CTS_VDAC_SEL_MASK       (0xf << 28)
  45 #define CTS_VDAC_SEL_SHIFT      28
  46 #define HHI_VIID_CLK_CNTL       0x12c /* 0x4b offset in data sheet */
  47 #define VCLK2_EN                BIT(19)
  48 #define VCLK2_SEL_MASK          (0x7 << 16)
  49 #define VCLK2_SEL_SHIFT         16
  50 #define VCLK2_SOFT_RESET        BIT(15)
  51 #define VCLK2_DIV1_EN           BIT(0)
  52 #define HHI_VID_CLK_DIV         0x164 /* 0x59 offset in data sheet */
  53 #define CTS_ENCI_SEL_MASK       (0xf << 28)
  54 #define CTS_ENCI_SEL_SHIFT      28
  55 #define HHI_VID_CLK_CNTL2       0x194 /* 0x65 offset in data sheet */
  56 #define CTS_ENCI_EN             BIT(0)
  57 #define CTS_VDAC_EN             BIT(4)
  58
  59 #define HHI_VDAC_CNTL0          0x2F4 /* 0xbd offset in data sheet */
  60 #define HHI_VDAC_CNTL1          0x2F8 /* 0xbe offset in data sheet */
  61
  62 #define HHI_HDMI_PLL_CNTL       0x320 /* 0xc8 offset in data sheet */
  63 #define HHI_HDMI_PLL_CNTL2      0x324 /* 0xc9 offset in data sheet */
  64 #define HHI_HDMI_PLL_CNTL3      0x328 /* 0xca offset in data sheet */
  65 #define HHI_HDMI_PLL_CNTL4      0x32C /* 0xcb offset in data sheet */
  66 #define HHI_HDMI_PLL_CNTL5      0x330 /* 0xcc offset in data sheet */
  67 #define HHI_HDMI_PLL_CNTL6      0x334 /* 0xcd offset in data sheet */
  68
  69 #define HDMI_PLL_RESET          BIT(28)
  70 #define HDMI_PLL_LOCK           BIT(31)
  71
  72 /*
  73  * Setup VCLK2 for 27MHz, and enable clocks for ENCI and VDAC
  74  *
  75  * TOFIX: Refactor into table to also handle HDMI frequency and paths
  76  */
  77 static void meson_venci_cvbs_clock_config(struct meson_drm *priv)
  78 {
  79         unsigned int val;
  80
  81         /* Setup PLL to output 1.485GHz */
  82         if (meson_vpu_is_compatible(priv, "amlogic,meson-gxbb-vpu")) {
  83                 regmap_write(priv->hhi, HHI_HDMI_PLL_CNTL, 0x5800023d);
  84                 regmap_write(priv->hhi, HHI_HDMI_PLL_CNTL2, 0x00404e00);
  85                 regmap_write(priv->hhi, HHI_HDMI_PLL_CNTL3, 0x0d5c5091);
  86                 regmap_write(priv->hhi, HHI_HDMI_PLL_CNTL4, 0x801da72c);
  87                 regmap_write(priv->hhi, HHI_HDMI_PLL_CNTL5, 0x71486980);
  88                 regmap_write(priv->hhi, HHI_HDMI_PLL_CNTL6, 0x00000e55);
  89                 regmap_write(priv->hhi, HHI_HDMI_PLL_CNTL, 0x4800023d);
  90         } else if (meson_vpu_is_compatible(priv, "amlogic,meson-gxm-vpu") ||
  91                    meson_vpu_is_compatible(priv, "amlogic,meson-gxl-vpu")) {
  92                 regmap_write(priv->hhi, HHI_HDMI_PLL_CNTL, 0x4000027b);
  93                 regmap_write(priv->hhi, HHI_HDMI_PLL_CNTL2, 0x800cb300);
  94                 regmap_write(priv->hhi, HHI_HDMI_PLL_CNTL3, 0xa6212844);
  95                 regmap_write(priv->hhi, HHI_HDMI_PLL_CNTL4, 0x0c4d000c);
  96                 regmap_write(priv->hhi, HHI_HDMI_PLL_CNTL5, 0x001fa729);
  97                 regmap_write(priv->hhi, HHI_HDMI_PLL_CNTL6, 0x01a31500);
  98
  99                 /* Reset PLL */
 100                 regmap_update_bits(priv->hhi, HHI_HDMI_PLL_CNTL,
 101                                         HDMI_PLL_RESET, HDMI_PLL_RESET);
 102                 regmap_update_bits(priv->hhi, HHI_HDMI_PLL_CNTL,
 103                                         HDMI_PLL_RESET, 0);
 104         }
 105
 106         /* Poll for lock bit */
 107         regmap_read_poll_timeout(priv->hhi, HHI_HDMI_PLL_CNTL, val,
 108                                  (val & HDMI_PLL_LOCK), 10, 0);
 109
 110         /* Disable VCLK2 */
 111         regmap_update_bits(priv->hhi, HHI_VIID_CLK_CNTL, VCLK2_EN, 0);
 112
 113         /* Disable vid_pll output clock */
 114         regmap_update_bits(priv->hhi, HHI_VID_PLL_CLK_DIV, VID_PLL_EN, 0);
 115         regmap_update_bits(priv->hhi, HHI_VID_PLL_CLK_DIV, VID_PLL_PRESET, 0);
 116         /* Enable vid_pll bypass to HDMI pll */
 117         regmap_update_bits(priv->hhi, HHI_VID_PLL_CLK_DIV,
 118                                 VID_PLL_BYPASS, VID_PLL_BYPASS);
 119         /* Enable the vid_pll output clock */
 120         regmap_update_bits(priv->hhi, HHI_VID_PLL_CLK_DIV,
 121                                 VID_PLL_EN, VID_PLL_EN);
 122
 123         /* Setup the VCLK2 divider value to achieve 27MHz */
 124         regmap_update_bits(priv->hhi, HHI_VIID_CLK_DIV,
 125                                 VCLK2_DIV_MASK, (55 - 1));
 126
 127         /* select vid_pll for vclk2 */
 128         regmap_update_bits(priv->hhi, HHI_VIID_CLK_CNTL,
 129                                 VCLK2_SEL_MASK, (4 << VCLK2_SEL_SHIFT));
 130         /* enable vclk2 gate */
 131         regmap_update_bits(priv->hhi, HHI_VIID_CLK_CNTL, VCLK2_EN, VCLK2_EN);
 132
 133         /* select vclk_div1 for enci */
 134         regmap_update_bits(priv->hhi, HHI_VID_CLK_DIV,
 135                                 CTS_ENCI_SEL_MASK, (8 << CTS_ENCI_SEL_SHIFT));
 136         /* select vclk_div1 for vdac */
 137         regmap_update_bits(priv->hhi, HHI_VIID_CLK_DIV,
 138                                 CTS_VDAC_SEL_MASK, (8 << CTS_VDAC_SEL_SHIFT));
 139
 140         /* release vclk2_div_reset and enable vclk2_div */
 141         regmap_update_bits(priv->hhi, HHI_VIID_CLK_DIV,
 142                                 VCLK2_DIV_EN | VCLK2_DIV_RESET, VCLK2_DIV_EN);
 143
 144         /* enable vclk2_div1 gate */
 145         regmap_update_bits(priv->hhi, HHI_VIID_CLK_CNTL,
 146                                 VCLK2_DIV1_EN, VCLK2_DIV1_EN);
 147
 148         /* reset vclk2 */
 149         regmap_update_bits(priv->hhi, HHI_VIID_CLK_CNTL,
 150                                 VCLK2_SOFT_RESET, VCLK2_SOFT_RESET);
 151         regmap_update_bits(priv->hhi, HHI_VIID_CLK_CNTL,
 152                                 VCLK2_SOFT_RESET, 0);
 153
 154         /* enable enci_clk */
 155         regmap_update_bits(priv->hhi, HHI_VID_CLK_CNTL2,
 156                                 CTS_ENCI_EN, CTS_ENCI_EN);
 157         /* enable vdac_clk */
 158         regmap_update_bits(priv->hhi, HHI_VID_CLK_CNTL2,
 159                                 CTS_VDAC_EN, CTS_VDAC_EN);
 160 }
 161
 162 void meson_vclk_setup(struct meson_drm *priv, unsigned int target,
 163                       unsigned int freq)
 164 {
 165         if (target == MESON_VCLK_TARGET_CVBS && freq == MESON_VCLK_CVBS)
 166                 meson_venci_cvbs_clock_config(priv);
 167 }