drivers/media/platform/s5p-cec/exynos_hdmi_cecctrl.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* drivers/media/platform/s5p-cec/exynos_hdmi_cecctrl.c
   3  *
   4  * Copyright (c) 2009, 2014 Samsung Electronics
   5  *              http://www.samsung.com/
   6  *
   7  * cec ftn file for Samsung TVOUT driver
   8  */
   9
  10 #include <linux/io.h>
  11 #include <linux/device.h>
  12
  13 #include "exynos_hdmi_cec.h"
  14 #include "regs-cec.h"
  15
  16 #define S5P_HDMI_FIN                    24000000
  17 #define CEC_DIV_RATIO                   320000
  18
  19 #define CEC_MESSAGE_BROADCAST_MASK      0x0F
  20 #define CEC_MESSAGE_BROADCAST           0x0F
  21 #define CEC_FILTER_THRESHOLD            0x15
  22
  23 void s5p_cec_set_divider(struct s5p_cec_dev *cec)
  24 {
  25         u32 div_ratio, div_val;
  26         unsigned int reg;
  27
  28         div_ratio  = S5P_HDMI_FIN / CEC_DIV_RATIO - 1;
  29
  30         if (regmap_read(cec->pmu, EXYNOS_HDMI_PHY_CONTROL, &reg)) {
  31                 dev_err(cec->dev, "failed to read phy control\n");
  32                 return;
  33         }
  34
  35         reg = (reg & ~(0x3FF << 16)) | (div_ratio << 16);
  36
  37         if (regmap_write(cec->pmu, EXYNOS_HDMI_PHY_CONTROL, reg)) {
  38                 dev_err(cec->dev, "failed to write phy control\n");
  39                 return;
  40         }
  41
  42         div_val = CEC_DIV_RATIO * 0.00005 - 1;
  43
  44         writeb(0x0, cec->reg + S5P_CEC_DIVISOR_3);
  45         writeb(0x0, cec->reg + S5P_CEC_DIVISOR_2);
  46         writeb(0x0, cec->reg + S5P_CEC_DIVISOR_1);
  47         writeb(div_val, cec->reg + S5P_CEC_DIVISOR_0);
  48 }
  49
  50 void s5p_cec_enable_rx(struct s5p_cec_dev *cec)
  51 {
  52         u8 reg;
  53
  54         reg = readb(cec->reg + S5P_CEC_RX_CTRL);
  55         reg |= S5P_CEC_RX_CTRL_ENABLE;
  56         writeb(reg, cec->reg + S5P_CEC_RX_CTRL);
  57 }
  58
  59 void s5p_cec_mask_rx_interrupts(struct s5p_cec_dev *cec)
  60 {
  61         u8 reg;
  62
  63         reg = readb(cec->reg + S5P_CEC_IRQ_MASK);
  64         reg |= S5P_CEC_IRQ_RX_DONE;
  65         reg |= S5P_CEC_IRQ_RX_ERROR;
  66         writeb(reg, cec->reg + S5P_CEC_IRQ_MASK);
  67 }
  68
  69 void s5p_cec_unmask_rx_interrupts(struct s5p_cec_dev *cec)
  70 {
  71         u8 reg;
  72
  73         reg = readb(cec->reg + S5P_CEC_IRQ_MASK);
  74         reg &= ~S5P_CEC_IRQ_RX_DONE;
  75         reg &= ~S5P_CEC_IRQ_RX_ERROR;
  76         writeb(reg, cec->reg + S5P_CEC_IRQ_MASK);
  77 }
  78
  79 void s5p_cec_mask_tx_interrupts(struct s5p_cec_dev *cec)
  80 {
  81         u8 reg;
  82
  83         reg = readb(cec->reg + S5P_CEC_IRQ_MASK);
  84         reg |= S5P_CEC_IRQ_TX_DONE;
  85         reg |= S5P_CEC_IRQ_TX_ERROR;
  86         writeb(reg, cec->reg + S5P_CEC_IRQ_MASK);
  87 }
  88
  89 void s5p_cec_unmask_tx_interrupts(struct s5p_cec_dev *cec)
  90 {
  91         u8 reg;
  92
  93         reg = readb(cec->reg + S5P_CEC_IRQ_MASK);
  94         reg &= ~S5P_CEC_IRQ_TX_DONE;
  95         reg &= ~S5P_CEC_IRQ_TX_ERROR;
  96         writeb(reg, cec->reg + S5P_CEC_IRQ_MASK);
  97 }
  98
  99 void s5p_cec_reset(struct s5p_cec_dev *cec)
 100 {
 101         u8 reg;
 102
 103         writeb(S5P_CEC_RX_CTRL_RESET, cec->reg + S5P_CEC_RX_CTRL);
 104         writeb(S5P_CEC_TX_CTRL_RESET, cec->reg + S5P_CEC_TX_CTRL);
 105
 106         reg = readb(cec->reg + 0xc4);
 107         reg &= ~0x1;
 108         writeb(reg, cec->reg + 0xc4);
 109 }
 110
 111 void s5p_cec_tx_reset(struct s5p_cec_dev *cec)
 112 {
 113         writeb(S5P_CEC_TX_CTRL_RESET, cec->reg + S5P_CEC_TX_CTRL);
 114 }
 115
 116 void s5p_cec_rx_reset(struct s5p_cec_dev *cec)
 117 {
 118         u8 reg;
 119
 120         writeb(S5P_CEC_RX_CTRL_RESET, cec->reg + S5P_CEC_RX_CTRL);
 121
 122         reg = readb(cec->reg + 0xc4);
 123         reg &= ~0x1;
 124         writeb(reg, cec->reg + 0xc4);
 125 }
 126
 127 void s5p_cec_threshold(struct s5p_cec_dev *cec)
 128 {
 129         writeb(CEC_FILTER_THRESHOLD, cec->reg + S5P_CEC_RX_FILTER_TH);
 130         writeb(0, cec->reg + S5P_CEC_RX_FILTER_CTRL);
 131 }
 132
 133 void s5p_cec_copy_packet(struct s5p_cec_dev *cec, char *data,
 134                          size_t count, u8 retries)
 135 {
 136         int i = 0;
 137         u8 reg;
 138
 139         while (i < count) {
 140                 writeb(data[i], cec->reg + (S5P_CEC_TX_BUFF0 + (i * 4)));
 141                 i++;
 142         }
 143
 144         writeb(count, cec->reg + S5P_CEC_TX_BYTES);
 145         reg = readb(cec->reg + S5P_CEC_TX_CTRL);
 146         reg |= S5P_CEC_TX_CTRL_START;
 147         reg &= ~0x70;
 148         reg |= retries << 4;
 149
 150         if ((data[0] & CEC_MESSAGE_BROADCAST_MASK) == CEC_MESSAGE_BROADCAST) {
 151                 dev_dbg(cec->dev, "Broadcast");
 152                 reg |= S5P_CEC_TX_CTRL_BCAST;
 153         } else {
 154                 dev_dbg(cec->dev, "No Broadcast");
 155                 reg &= ~S5P_CEC_TX_CTRL_BCAST;
 156         }
 157
 158         writeb(reg, cec->reg + S5P_CEC_TX_CTRL);
 159         dev_dbg(cec->dev, "cec-tx: cec count (%zu): %*ph", count,
 160                 (int)count, data);
 161 }
 162
 163 void s5p_cec_set_addr(struct s5p_cec_dev *cec, u32 addr)
 164 {
 165         writeb(addr & 0x0F, cec->reg + S5P_CEC_LOGIC_ADDR);
 166 }
 167
 168 u32 s5p_cec_get_status(struct s5p_cec_dev *cec)
 169 {
 170         u32 status = 0;
 171
 172         status = readb(cec->reg + S5P_CEC_STATUS_0) & 0xf;
 173         status |= (readb(cec->reg + S5P_CEC_TX_STAT1) & 0xf) << 4;
 174         status |= readb(cec->reg + S5P_CEC_STATUS_1) << 8;
 175         status |= readb(cec->reg + S5P_CEC_STATUS_2) << 16;
 176         status |= readb(cec->reg + S5P_CEC_STATUS_3) << 24;
 177
 178         dev_dbg(cec->dev, "status = 0x%x!\n", status);
 179
 180         return status;
 181 }
 182
 183 void s5p_clr_pending_tx(struct s5p_cec_dev *cec)
 184 {
 185         writeb(S5P_CEC_IRQ_TX_DONE | S5P_CEC_IRQ_TX_ERROR,
 186                cec->reg + S5P_CEC_IRQ_CLEAR);
 187 }
 188
 189 void s5p_clr_pending_rx(struct s5p_cec_dev *cec)
 190 {
 191         writeb(S5P_CEC_IRQ_RX_DONE | S5P_CEC_IRQ_RX_ERROR,
 192                cec->reg + S5P_CEC_IRQ_CLEAR);
 193 }
 194
 195 void s5p_cec_get_rx_buf(struct s5p_cec_dev *cec, u32 size, u8 *buffer)
 196 {
 197         u32 i = 0;
 198         char debug[40];
 199
 200         while (i < size) {
 201                 buffer[i] = readb(cec->reg + S5P_CEC_RX_BUFF0 + (i * 4));
 202                 sprintf(debug + i * 2, "%02x ", buffer[i]);
 203                 i++;
 204         }
 205         dev_dbg(cec->dev, "cec-rx: cec size(%d): %s", size, debug);
 206 }