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
s5p_cec_set_divider(struct s5p_cec_dev * cec)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, ®)) {
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
s5p_cec_enable_rx(struct s5p_cec_dev * cec)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
s5p_cec_mask_rx_interrupts(struct s5p_cec_dev * cec)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
s5p_cec_unmask_rx_interrupts(struct s5p_cec_dev * cec)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
s5p_cec_mask_tx_interrupts(struct s5p_cec_dev * cec)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
s5p_cec_unmask_tx_interrupts(struct s5p_cec_dev * cec)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
s5p_cec_reset(struct s5p_cec_dev * cec)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
s5p_cec_tx_reset(struct s5p_cec_dev * cec)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
s5p_cec_rx_reset(struct s5p_cec_dev * cec)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
s5p_cec_threshold(struct s5p_cec_dev * cec)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
s5p_cec_copy_packet(struct s5p_cec_dev * cec,char * data,size_t count,u8 retries)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
s5p_cec_set_addr(struct s5p_cec_dev * cec,u32 addr)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
s5p_cec_get_status(struct s5p_cec_dev * cec)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
s5p_clr_pending_tx(struct s5p_cec_dev * cec)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
s5p_clr_pending_rx(struct s5p_cec_dev * cec)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
s5p_cec_get_rx_buf(struct s5p_cec_dev * cec,u32 size,u8 * buffer)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 }
207