1 // SPDX-License-Identifier: GPL-2.0
3 * camss-csiphy-2ph-1-0.c
5 * Qualcomm MSM Camera Subsystem - CSIPHY Module 2phase v1.0
7 * Copyright (c) 2011-2015, The Linux Foundation. All rights reserved.
8 * Copyright (C) 2016-2018 Linaro Ltd.
11 #include "camss-csiphy.h"
13 #include <linux/delay.h>
14 #include <linux/interrupt.h>
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
29 static void csiphy_hw_version_read(struct csiphy_device *csiphy,
32 u8 hw_version = readl_relaxed(csiphy->base +
33 CAMSS_CSI_PHY_HW_VERSION);
35 dev_dbg(dev, "CSIPHY HW Version = 0x%02x\n", hw_version);
39 * csiphy_reset - Perform software reset on CSIPHY module
40 * @csiphy: CSIPHY device
42 static void csiphy_reset(struct csiphy_device *csiphy)
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);
50 * csiphy_settle_cnt_calc - Calculate settle count value
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 pixel clock
57 * Return settle count value or 0 if the CSI2 pixel clock
58 * frequency is not available
60 static u8 csiphy_settle_cnt_calc(u32 pixel_clock, u8 bpp, u8 num_lanes,
63 u32 mipi_clock; /* Hz */
65 u32 timer_period; /* ps */
66 u32 t_hs_prepare_max; /* ps */
67 u32 t_hs_prepare_zero_min; /* ps */
68 u32 t_hs_settle; /* ps */
71 mipi_clock = pixel_clock * bpp / (2 * num_lanes);
72 ui = div_u64(1000000000000LL, mipi_clock);
74 t_hs_prepare_max = 85000 + 6 * ui;
75 t_hs_prepare_zero_min = 145000 + 10 * ui;
76 t_hs_settle = (t_hs_prepare_max + t_hs_prepare_zero_min) / 2;
78 timer_period = div_u64(1000000000000LL, timer_clk_rate);
79 settle_cnt = t_hs_settle / timer_period - 1;
84 static void csiphy_lanes_enable(struct csiphy_device *csiphy,
85 struct csiphy_config *cfg,
86 u32 pixel_clock, u8 bpp, u8 lane_mask)
88 struct csiphy_lanes_cfg *c = &cfg->csi2->lane_cfg;
93 settle_cnt = csiphy_settle_cnt_calc(pixel_clock, bpp, c->num_data,
94 csiphy->timer_clk_rate);
96 writel_relaxed(0x1, csiphy->base +
97 CAMSS_CSI_PHY_GLBL_T_INIT_CFG0);
98 writel_relaxed(0x1, csiphy->base +
99 CAMSS_CSI_PHY_T_WAKEUP_CFG0);
102 val |= lane_mask << 1;
103 writel_relaxed(val, csiphy->base + CAMSS_CSI_PHY_GLBL_PWR_CFG);
105 val = cfg->combo_mode << 4;
106 writel_relaxed(val, csiphy->base + CAMSS_CSI_PHY_GLBL_RESET);
108 for (i = 0; i <= c->num_data; i++) {
109 if (i == c->num_data)
114 writel_relaxed(0x10, csiphy->base +
115 CAMSS_CSI_PHY_LNn_CFG2(l));
116 writel_relaxed(settle_cnt, csiphy->base +
117 CAMSS_CSI_PHY_LNn_CFG3(l));
118 writel_relaxed(0x3f, csiphy->base +
119 CAMSS_CSI_PHY_INTERRUPT_MASKn(l));
120 writel_relaxed(0x3f, csiphy->base +
121 CAMSS_CSI_PHY_INTERRUPT_CLEARn(l));
125 static void csiphy_lanes_disable(struct csiphy_device *csiphy,
126 struct csiphy_config *cfg)
128 struct csiphy_lanes_cfg *c = &cfg->csi2->lane_cfg;
132 for (i = 0; i <= c->num_data; i++) {
133 if (i == c->num_data)
138 writel_relaxed(0x0, csiphy->base +
139 CAMSS_CSI_PHY_LNn_CFG2(l));
142 writel_relaxed(0x0, csiphy->base + CAMSS_CSI_PHY_GLBL_PWR_CFG);
146 * csiphy_isr - CSIPHY module interrupt handler
147 * @irq: Interrupt line
148 * @dev: CSIPHY device
150 * Return IRQ_HANDLED on success
152 static irqreturn_t csiphy_isr(int irq, void *dev)
154 struct csiphy_device *csiphy = dev;
157 for (i = 0; i < 8; i++) {
158 u8 val = readl_relaxed(csiphy->base +
159 CAMSS_CSI_PHY_INTERRUPT_STATUSn(i));
160 writel_relaxed(val, csiphy->base +
161 CAMSS_CSI_PHY_INTERRUPT_CLEARn(i));
162 writel_relaxed(0x1, csiphy->base + CAMSS_CSI_PHY_GLBL_IRQ_CMD);
163 writel_relaxed(0x0, csiphy->base + CAMSS_CSI_PHY_GLBL_IRQ_CMD);
164 writel_relaxed(0x0, csiphy->base +
165 CAMSS_CSI_PHY_INTERRUPT_CLEARn(i));
171 const struct csiphy_hw_ops csiphy_ops_2ph_1_0 = {
172 .hw_version_read = csiphy_hw_version_read,
173 .reset = csiphy_reset,
174 .lanes_enable = csiphy_lanes_enable,
175 .lanes_disable = csiphy_lanes_disable,