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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
23void 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
50void 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
59void 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
69void 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
79void 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
89void 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
99void 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
111void 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
116void 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
127void 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
133void 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
163void s5p_cec_set_addr(struct s5p_cec_dev *cec, u32 addr)
164{
165 writeb(addr & 0x0F, cec->reg + S5P_CEC_LOGIC_ADDR);
166}
167
168u32 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
183void 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
189void 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
195void 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
