1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * camss-csiphy-2ph-1-0.c
4 *
5 * Qualcomm MSM Camera Subsystem - CSIPHY Module 2phase v1.0
6 *
7 * Copyright (c) 2011-2015, The Linux Foundation. All rights reserved.
8 * Copyright (C) 2016-2018 Linaro Ltd.
9 */
10
11 #include "camss-csiphy.h"
12
13 #include <linux/delay.h>
14 #include <linux/interrupt.h>
15 #include <linux/io.h>
16
17 #define CAMSS_CSI_PHY_LNn_CFG2(n) (0x004 + 0x40 * (n))
18 #define CAMSS_CSI_PHY_LNn_CFG3(n) (0x008 + 0x40 * (n))
19 #define CAMSS_CSI_PHY_GLBL_RESET 0x140
20 #define CAMSS_CSI_PHY_GLBL_PWR_CFG 0x144
21 #define CAMSS_CSI_PHY_GLBL_IRQ_CMD 0x164
22 #define CAMSS_CSI_PHY_HW_VERSION 0x188
23 #define CAMSS_CSI_PHY_INTERRUPT_STATUSn(n) (0x18c + 0x4 * (n))
24 #define CAMSS_CSI_PHY_INTERRUPT_MASKn(n) (0x1ac + 0x4 * (n))
25 #define CAMSS_CSI_PHY_INTERRUPT_CLEARn(n) (0x1cc + 0x4 * (n))
26 #define CAMSS_CSI_PHY_GLBL_T_INIT_CFG0 0x1ec
27 #define CAMSS_CSI_PHY_T_WAKEUP_CFG0 0x1f4
28
csiphy_hw_version_read(struct csiphy_device * csiphy,struct device * dev)29 static void csiphy_hw_version_read(struct csiphy_device *csiphy,
30 struct device *dev)
31 {
32 u8 hw_version = readl_relaxed(csiphy->base +
33 CAMSS_CSI_PHY_HW_VERSION);
34
35 dev_dbg(dev, "CSIPHY HW Version = 0x%02x\n", hw_version);
36 }
37
38 /*
39 * csiphy_reset - Perform software reset on CSIPHY module
40 * @csiphy: CSIPHY device
41 */
csiphy_reset(struct csiphy_device * csiphy)42 static void csiphy_reset(struct csiphy_device *csiphy)
43 {
44 writel_relaxed(0x1, csiphy->base + CAMSS_CSI_PHY_GLBL_RESET);
45 usleep_range(5000, 8000);
46 writel_relaxed(0x0, csiphy->base + CAMSS_CSI_PHY_GLBL_RESET);
47 }
48
49 /*
50 * csiphy_settle_cnt_calc - Calculate settle count value
51 *
52 * Helper function to calculate settle count value. This is
53 * based on the CSI2 T_hs_settle parameter which in turn
54 * is calculated based on the CSI2 transmitter link frequency.
55 *
56 * Return settle count value or 0 if the CSI2 link frequency
57 * is not available
58 */
csiphy_settle_cnt_calc(s64 link_freq,u32 timer_clk_rate)59 static u8 csiphy_settle_cnt_calc(s64 link_freq, u32 timer_clk_rate)
60 {
61 u32 ui; /* ps */
62 u32 timer_period; /* ps */
63 u32 t_hs_prepare_max; /* ps */
64 u32 t_hs_prepare_zero_min; /* ps */
65 u32 t_hs_settle; /* ps */
66 u8 settle_cnt;
67
68 if (link_freq <= 0)
69 return 0;
70
71 ui = div_u64(1000000000000LL, link_freq);
72 ui /= 2;
73 t_hs_prepare_max = 85000 + 6 * ui;
74 t_hs_prepare_zero_min = 145000 + 10 * ui;
75 t_hs_settle = (t_hs_prepare_max + t_hs_prepare_zero_min) / 2;
76
77 timer_period = div_u64(1000000000000LL, timer_clk_rate);
78 settle_cnt = t_hs_settle / timer_period - 1;
79
80 return settle_cnt;
81 }
82
csiphy_lanes_enable(struct csiphy_device * csiphy,struct csiphy_config * cfg,s64 link_freq,u8 lane_mask)83 static void csiphy_lanes_enable(struct csiphy_device *csiphy,
84 struct csiphy_config *cfg,
85 s64 link_freq, u8 lane_mask)
86 {
87 struct csiphy_lanes_cfg *c = &cfg->csi2->lane_cfg;
88 u8 settle_cnt;
89 u8 val, l = 0;
90 int i = 0;
91
92 settle_cnt = csiphy_settle_cnt_calc(link_freq, csiphy->timer_clk_rate);
93
94 writel_relaxed(0x1, csiphy->base +
95 CAMSS_CSI_PHY_GLBL_T_INIT_CFG0);
96 writel_relaxed(0x1, csiphy->base +
97 CAMSS_CSI_PHY_T_WAKEUP_CFG0);
98
99 val = 0x1;
100 val |= lane_mask << 1;
101 writel_relaxed(val, csiphy->base + CAMSS_CSI_PHY_GLBL_PWR_CFG);
102
103 val = cfg->combo_mode << 4;
104 writel_relaxed(val, csiphy->base + CAMSS_CSI_PHY_GLBL_RESET);
105
106 for (i = 0; i <= c->num_data; i++) {
107 if (i == c->num_data)
108 l = c->clk.pos;
109 else
110 l = c->data[i].pos;
111
112 writel_relaxed(0x10, csiphy->base +
113 CAMSS_CSI_PHY_LNn_CFG2(l));
114 writel_relaxed(settle_cnt, csiphy->base +
115 CAMSS_CSI_PHY_LNn_CFG3(l));
116 writel_relaxed(0x3f, csiphy->base +
117 CAMSS_CSI_PHY_INTERRUPT_MASKn(l));
118 writel_relaxed(0x3f, csiphy->base +
119 CAMSS_CSI_PHY_INTERRUPT_CLEARn(l));
120 }
121 }
122
csiphy_lanes_disable(struct csiphy_device * csiphy,struct csiphy_config * cfg)123 static void csiphy_lanes_disable(struct csiphy_device *csiphy,
124 struct csiphy_config *cfg)
125 {
126 struct csiphy_lanes_cfg *c = &cfg->csi2->lane_cfg;
127 u8 l = 0;
128 int i = 0;
129
130 for (i = 0; i <= c->num_data; i++) {
131 if (i == c->num_data)
132 l = c->clk.pos;
133 else
134 l = c->data[i].pos;
135
136 writel_relaxed(0x0, csiphy->base +
137 CAMSS_CSI_PHY_LNn_CFG2(l));
138 }
139
140 writel_relaxed(0x0, csiphy->base + CAMSS_CSI_PHY_GLBL_PWR_CFG);
141 }
142
143 /*
144 * csiphy_isr - CSIPHY module interrupt handler
145 * @irq: Interrupt line
146 * @dev: CSIPHY device
147 *
148 * Return IRQ_HANDLED on success
149 */
csiphy_isr(int irq,void * dev)150 static irqreturn_t csiphy_isr(int irq, void *dev)
151 {
152 struct csiphy_device *csiphy = dev;
153 u8 i;
154
155 for (i = 0; i < 8; i++) {
156 u8 val = readl_relaxed(csiphy->base +
157 CAMSS_CSI_PHY_INTERRUPT_STATUSn(i));
158 writel_relaxed(val, csiphy->base +
159 CAMSS_CSI_PHY_INTERRUPT_CLEARn(i));
160 writel_relaxed(0x1, csiphy->base + CAMSS_CSI_PHY_GLBL_IRQ_CMD);
161 writel_relaxed(0x0, csiphy->base + CAMSS_CSI_PHY_GLBL_IRQ_CMD);
162 writel_relaxed(0x0, csiphy->base +
163 CAMSS_CSI_PHY_INTERRUPT_CLEARn(i));
164 }
165
166 return IRQ_HANDLED;
167 }
168
169 const struct csiphy_hw_ops csiphy_ops_2ph_1_0 = {
170 .hw_version_read = csiphy_hw_version_read,
171 .reset = csiphy_reset,
172 .lanes_enable = csiphy_lanes_enable,
173 .lanes_disable = csiphy_lanes_disable,
174 .isr = csiphy_isr,
175 };
176