LXR linux/drivers/media/platform/qcom/camss/camss-csiphy-2ph-1-0.c

   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
  29static 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 */
  42static 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 */
  59static 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
  83static 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
 123static 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 */
 150static 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
 169const 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