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- /*
- * Copyright (C) 2013 NVIDIA Corporation
- *
- * Permission to use, copy, modify, distribute, and sell this software and its
- * documentation for any purpose is hereby granted without fee, provided that
- * the above copyright notice appear in all copies and that both that copyright
- * notice and this permission notice appear in supporting documentation, and
- * that the name of the copyright holders not be used in advertising or
- * publicity pertaining to distribution of the software without specific,
- * written prior permission. The copyright holders make no representations
- * about the suitability of this software for any purpose. It is provided "as
- * is" without express or implied warranty.
- *
- * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
- * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
- * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
- * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
- * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
- * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
- * OF THIS SOFTWARE.
- */
- #include <linux/clk.h>
- #include <linux/delay.h>
- #include <linux/host1x.h>
- #include <linux/io.h>
- #include <linux/of_platform.h>
- #include <linux/platform_device.h>
- #include <linux/slab.h>
- #include "dev.h"
- #define MIPI_CAL_CTRL 0x00
- #define MIPI_CAL_CTRL_NOISE_FILTER(x) (((x) & 0xf) << 26)
- #define MIPI_CAL_CTRL_PRESCALE(x) (((x) & 0x3) << 24)
- #define MIPI_CAL_CTRL_CLKEN_OVR (1 << 4)
- #define MIPI_CAL_CTRL_START (1 << 0)
- #define MIPI_CAL_AUTOCAL_CTRL 0x01
- #define MIPI_CAL_STATUS 0x02
- #define MIPI_CAL_STATUS_DONE (1 << 16)
- #define MIPI_CAL_STATUS_ACTIVE (1 << 0)
- #define MIPI_CAL_CONFIG_CSIA 0x05
- #define MIPI_CAL_CONFIG_CSIB 0x06
- #define MIPI_CAL_CONFIG_CSIC 0x07
- #define MIPI_CAL_CONFIG_CSID 0x08
- #define MIPI_CAL_CONFIG_CSIE 0x09
- #define MIPI_CAL_CONFIG_CSIF 0x0a
- #define MIPI_CAL_CONFIG_DSIA 0x0e
- #define MIPI_CAL_CONFIG_DSIB 0x0f
- #define MIPI_CAL_CONFIG_DSIC 0x10
- #define MIPI_CAL_CONFIG_DSID 0x11
- #define MIPI_CAL_CONFIG_DSIA_CLK 0x19
- #define MIPI_CAL_CONFIG_DSIB_CLK 0x1a
- #define MIPI_CAL_CONFIG_CSIAB_CLK 0x1b
- #define MIPI_CAL_CONFIG_DSIC_CLK 0x1c
- #define MIPI_CAL_CONFIG_CSICD_CLK 0x1c
- #define MIPI_CAL_CONFIG_DSID_CLK 0x1d
- #define MIPI_CAL_CONFIG_CSIE_CLK 0x1d
- /* for data and clock lanes */
- #define MIPI_CAL_CONFIG_SELECT (1 << 21)
- /* for data lanes */
- #define MIPI_CAL_CONFIG_HSPDOS(x) (((x) & 0x1f) << 16)
- #define MIPI_CAL_CONFIG_HSPUOS(x) (((x) & 0x1f) << 8)
- #define MIPI_CAL_CONFIG_TERMOS(x) (((x) & 0x1f) << 0)
- /* for clock lanes */
- #define MIPI_CAL_CONFIG_HSCLKPDOSD(x) (((x) & 0x1f) << 8)
- #define MIPI_CAL_CONFIG_HSCLKPUOSD(x) (((x) & 0x1f) << 0)
- #define MIPI_CAL_BIAS_PAD_CFG0 0x16
- #define MIPI_CAL_BIAS_PAD_PDVCLAMP (1 << 1)
- #define MIPI_CAL_BIAS_PAD_E_VCLAMP_REF (1 << 0)
- #define MIPI_CAL_BIAS_PAD_CFG1 0x17
- #define MIPI_CAL_BIAS_PAD_DRV_DN_REF(x) (((x) & 0x7) << 16)
- #define MIPI_CAL_BIAS_PAD_DRV_UP_REF(x) (((x) & 0x7) << 8)
- #define MIPI_CAL_BIAS_PAD_CFG2 0x18
- #define MIPI_CAL_BIAS_PAD_VCLAMP(x) (((x) & 0x7) << 16)
- #define MIPI_CAL_BIAS_PAD_VAUXP(x) (((x) & 0x7) << 4)
- #define MIPI_CAL_BIAS_PAD_PDVREG (1 << 1)
- struct tegra_mipi_pad {
- unsigned long data;
- unsigned long clk;
- };
- struct tegra_mipi_soc {
- bool has_clk_lane;
- const struct tegra_mipi_pad *pads;
- unsigned int num_pads;
- bool clock_enable_override;
- bool needs_vclamp_ref;
- /* bias pad configuration settings */
- u8 pad_drive_down_ref;
- u8 pad_drive_up_ref;
- u8 pad_vclamp_level;
- u8 pad_vauxp_level;
- /* calibration settings for data lanes */
- u8 hspdos;
- u8 hspuos;
- u8 termos;
- /* calibration settings for clock lanes */
- u8 hsclkpdos;
- u8 hsclkpuos;
- };
- struct tegra_mipi {
- const struct tegra_mipi_soc *soc;
- struct device *dev;
- void __iomem *regs;
- struct mutex lock;
- struct clk *clk;
- unsigned long usage_count;
- };
- struct tegra_mipi_device {
- struct platform_device *pdev;
- struct tegra_mipi *mipi;
- struct device *device;
- unsigned long pads;
- };
- static inline u32 tegra_mipi_readl(struct tegra_mipi *mipi,
- unsigned long offset)
- {
- return readl(mipi->regs + (offset << 2));
- }
- static inline void tegra_mipi_writel(struct tegra_mipi *mipi, u32 value,
- unsigned long offset)
- {
- writel(value, mipi->regs + (offset << 2));
- }
- static int tegra_mipi_power_up(struct tegra_mipi *mipi)
- {
- u32 value;
- int err;
- err = clk_enable(mipi->clk);
- if (err < 0)
- return err;
- value = tegra_mipi_readl(mipi, MIPI_CAL_BIAS_PAD_CFG0);
- value &= ~MIPI_CAL_BIAS_PAD_PDVCLAMP;
- if (mipi->soc->needs_vclamp_ref)
- value |= MIPI_CAL_BIAS_PAD_E_VCLAMP_REF;
- tegra_mipi_writel(mipi, value, MIPI_CAL_BIAS_PAD_CFG0);
- value = tegra_mipi_readl(mipi, MIPI_CAL_BIAS_PAD_CFG2);
- value &= ~MIPI_CAL_BIAS_PAD_PDVREG;
- tegra_mipi_writel(mipi, value, MIPI_CAL_BIAS_PAD_CFG2);
- clk_disable(mipi->clk);
- return 0;
- }
- static int tegra_mipi_power_down(struct tegra_mipi *mipi)
- {
- u32 value;
- int err;
- err = clk_enable(mipi->clk);
- if (err < 0)
- return err;
- /*
- * The MIPI_CAL_BIAS_PAD_PDVREG controls a voltage regulator that
- * supplies the DSI pads. This must be kept enabled until none of the
- * DSI lanes are used anymore.
- */
- value = tegra_mipi_readl(mipi, MIPI_CAL_BIAS_PAD_CFG2);
- value |= MIPI_CAL_BIAS_PAD_PDVREG;
- tegra_mipi_writel(mipi, value, MIPI_CAL_BIAS_PAD_CFG2);
- /*
- * MIPI_CAL_BIAS_PAD_PDVCLAMP and MIPI_CAL_BIAS_PAD_E_VCLAMP_REF
- * control a regulator that supplies current to the pre-driver logic.
- * Powering down this regulator causes DSI to fail, so it must remain
- * powered on until none of the DSI lanes are used anymore.
- */
- value = tegra_mipi_readl(mipi, MIPI_CAL_BIAS_PAD_CFG0);
- if (mipi->soc->needs_vclamp_ref)
- value &= ~MIPI_CAL_BIAS_PAD_E_VCLAMP_REF;
- value |= MIPI_CAL_BIAS_PAD_PDVCLAMP;
- tegra_mipi_writel(mipi, value, MIPI_CAL_BIAS_PAD_CFG0);
- return 0;
- }
- struct tegra_mipi_device *tegra_mipi_request(struct device *device)
- {
- struct device_node *np = device->of_node;
- struct tegra_mipi_device *dev;
- struct of_phandle_args args;
- int err;
- err = of_parse_phandle_with_args(np, "nvidia,mipi-calibrate",
- "#nvidia,mipi-calibrate-cells", 0,
- &args);
- if (err < 0)
- return ERR_PTR(err);
- dev = kzalloc(sizeof(*dev), GFP_KERNEL);
- if (!dev) {
- err = -ENOMEM;
- goto out;
- }
- dev->pdev = of_find_device_by_node(args.np);
- if (!dev->pdev) {
- err = -ENODEV;
- goto free;
- }
- dev->mipi = platform_get_drvdata(dev->pdev);
- if (!dev->mipi) {
- err = -EPROBE_DEFER;
- goto put;
- }
- of_node_put(args.np);
- dev->pads = args.args[0];
- dev->device = device;
- return dev;
- put:
- platform_device_put(dev->pdev);
- free:
- kfree(dev);
- out:
- of_node_put(args.np);
- return ERR_PTR(err);
- }
- EXPORT_SYMBOL(tegra_mipi_request);
- void tegra_mipi_free(struct tegra_mipi_device *device)
- {
- platform_device_put(device->pdev);
- kfree(device);
- }
- EXPORT_SYMBOL(tegra_mipi_free);
- int tegra_mipi_enable(struct tegra_mipi_device *dev)
- {
- int err = 0;
- mutex_lock(&dev->mipi->lock);
- if (dev->mipi->usage_count++ == 0)
- err = tegra_mipi_power_up(dev->mipi);
- mutex_unlock(&dev->mipi->lock);
- return err;
- }
- EXPORT_SYMBOL(tegra_mipi_enable);
- int tegra_mipi_disable(struct tegra_mipi_device *dev)
- {
- int err = 0;
- mutex_lock(&dev->mipi->lock);
- if (--dev->mipi->usage_count == 0)
- err = tegra_mipi_power_down(dev->mipi);
- mutex_unlock(&dev->mipi->lock);
- return err;
- }
- EXPORT_SYMBOL(tegra_mipi_disable);
- static int tegra_mipi_wait(struct tegra_mipi *mipi)
- {
- unsigned long timeout = jiffies + msecs_to_jiffies(250);
- u32 value;
- while (time_before(jiffies, timeout)) {
- value = tegra_mipi_readl(mipi, MIPI_CAL_STATUS);
- if ((value & MIPI_CAL_STATUS_ACTIVE) == 0 &&
- (value & MIPI_CAL_STATUS_DONE) != 0)
- return 0;
- usleep_range(10, 50);
- }
- return -ETIMEDOUT;
- }
- int tegra_mipi_calibrate(struct tegra_mipi_device *device)
- {
- const struct tegra_mipi_soc *soc = device->mipi->soc;
- unsigned int i;
- u32 value;
- int err;
- err = clk_enable(device->mipi->clk);
- if (err < 0)
- return err;
- mutex_lock(&device->mipi->lock);
- value = MIPI_CAL_BIAS_PAD_DRV_DN_REF(soc->pad_drive_down_ref) |
- MIPI_CAL_BIAS_PAD_DRV_UP_REF(soc->pad_drive_up_ref);
- tegra_mipi_writel(device->mipi, value, MIPI_CAL_BIAS_PAD_CFG1);
- value = tegra_mipi_readl(device->mipi, MIPI_CAL_BIAS_PAD_CFG2);
- value &= ~MIPI_CAL_BIAS_PAD_VCLAMP(0x7);
- value &= ~MIPI_CAL_BIAS_PAD_VAUXP(0x7);
- value |= MIPI_CAL_BIAS_PAD_VCLAMP(soc->pad_vclamp_level);
- value |= MIPI_CAL_BIAS_PAD_VAUXP(soc->pad_vauxp_level);
- tegra_mipi_writel(device->mipi, value, MIPI_CAL_BIAS_PAD_CFG2);
- for (i = 0; i < soc->num_pads; i++) {
- u32 clk = 0, data = 0;
- if (device->pads & BIT(i)) {
- data = MIPI_CAL_CONFIG_SELECT |
- MIPI_CAL_CONFIG_HSPDOS(soc->hspdos) |
- MIPI_CAL_CONFIG_HSPUOS(soc->hspuos) |
- MIPI_CAL_CONFIG_TERMOS(soc->termos);
- clk = MIPI_CAL_CONFIG_SELECT |
- MIPI_CAL_CONFIG_HSCLKPDOSD(soc->hsclkpdos) |
- MIPI_CAL_CONFIG_HSCLKPUOSD(soc->hsclkpuos);
- }
- tegra_mipi_writel(device->mipi, data, soc->pads[i].data);
- if (soc->has_clk_lane && soc->pads[i].clk != 0)
- tegra_mipi_writel(device->mipi, clk, soc->pads[i].clk);
- }
- value = tegra_mipi_readl(device->mipi, MIPI_CAL_CTRL);
- value &= ~MIPI_CAL_CTRL_NOISE_FILTER(0xf);
- value &= ~MIPI_CAL_CTRL_PRESCALE(0x3);
- value |= MIPI_CAL_CTRL_NOISE_FILTER(0xa);
- value |= MIPI_CAL_CTRL_PRESCALE(0x2);
- if (!soc->clock_enable_override)
- value &= ~MIPI_CAL_CTRL_CLKEN_OVR;
- else
- value |= MIPI_CAL_CTRL_CLKEN_OVR;
- tegra_mipi_writel(device->mipi, value, MIPI_CAL_CTRL);
- /* clear any pending status bits */
- value = tegra_mipi_readl(device->mipi, MIPI_CAL_STATUS);
- tegra_mipi_writel(device->mipi, value, MIPI_CAL_STATUS);
- value = tegra_mipi_readl(device->mipi, MIPI_CAL_CTRL);
- value |= MIPI_CAL_CTRL_START;
- tegra_mipi_writel(device->mipi, value, MIPI_CAL_CTRL);
- err = tegra_mipi_wait(device->mipi);
- mutex_unlock(&device->mipi->lock);
- clk_disable(device->mipi->clk);
- return err;
- }
- EXPORT_SYMBOL(tegra_mipi_calibrate);
- static const struct tegra_mipi_pad tegra114_mipi_pads[] = {
- { .data = MIPI_CAL_CONFIG_CSIA },
- { .data = MIPI_CAL_CONFIG_CSIB },
- { .data = MIPI_CAL_CONFIG_CSIC },
- { .data = MIPI_CAL_CONFIG_CSID },
- { .data = MIPI_CAL_CONFIG_CSIE },
- { .data = MIPI_CAL_CONFIG_DSIA },
- { .data = MIPI_CAL_CONFIG_DSIB },
- { .data = MIPI_CAL_CONFIG_DSIC },
- { .data = MIPI_CAL_CONFIG_DSID },
- };
- static const struct tegra_mipi_soc tegra114_mipi_soc = {
- .has_clk_lane = false,
- .pads = tegra114_mipi_pads,
- .num_pads = ARRAY_SIZE(tegra114_mipi_pads),
- .clock_enable_override = true,
- .needs_vclamp_ref = true,
- .pad_drive_down_ref = 0x2,
- .pad_drive_up_ref = 0x0,
- .pad_vclamp_level = 0x0,
- .pad_vauxp_level = 0x0,
- .hspdos = 0x0,
- .hspuos = 0x4,
- .termos = 0x5,
- .hsclkpdos = 0x0,
- .hsclkpuos = 0x4,
- };
- static const struct tegra_mipi_pad tegra124_mipi_pads[] = {
- { .data = MIPI_CAL_CONFIG_CSIA, .clk = MIPI_CAL_CONFIG_CSIAB_CLK },
- { .data = MIPI_CAL_CONFIG_CSIB, .clk = MIPI_CAL_CONFIG_CSIAB_CLK },
- { .data = MIPI_CAL_CONFIG_CSIC, .clk = MIPI_CAL_CONFIG_CSICD_CLK },
- { .data = MIPI_CAL_CONFIG_CSID, .clk = MIPI_CAL_CONFIG_CSICD_CLK },
- { .data = MIPI_CAL_CONFIG_CSIE, .clk = MIPI_CAL_CONFIG_CSIE_CLK },
- { .data = MIPI_CAL_CONFIG_DSIA, .clk = MIPI_CAL_CONFIG_DSIA_CLK },
- { .data = MIPI_CAL_CONFIG_DSIB, .clk = MIPI_CAL_CONFIG_DSIB_CLK },
- };
- static const struct tegra_mipi_soc tegra124_mipi_soc = {
- .has_clk_lane = true,
- .pads = tegra124_mipi_pads,
- .num_pads = ARRAY_SIZE(tegra124_mipi_pads),
- .clock_enable_override = true,
- .needs_vclamp_ref = true,
- .pad_drive_down_ref = 0x2,
- .pad_drive_up_ref = 0x0,
- .pad_vclamp_level = 0x0,
- .pad_vauxp_level = 0x0,
- .hspdos = 0x0,
- .hspuos = 0x0,
- .termos = 0x0,
- .hsclkpdos = 0x1,
- .hsclkpuos = 0x2,
- };
- static const struct tegra_mipi_soc tegra132_mipi_soc = {
- .has_clk_lane = true,
- .pads = tegra124_mipi_pads,
- .num_pads = ARRAY_SIZE(tegra124_mipi_pads),
- .clock_enable_override = false,
- .needs_vclamp_ref = false,
- .pad_drive_down_ref = 0x0,
- .pad_drive_up_ref = 0x3,
- .pad_vclamp_level = 0x0,
- .pad_vauxp_level = 0x0,
- .hspdos = 0x0,
- .hspuos = 0x0,
- .termos = 0x0,
- .hsclkpdos = 0x3,
- .hsclkpuos = 0x2,
- };
- static const struct tegra_mipi_pad tegra210_mipi_pads[] = {
- { .data = MIPI_CAL_CONFIG_CSIA, .clk = 0 },
- { .data = MIPI_CAL_CONFIG_CSIB, .clk = 0 },
- { .data = MIPI_CAL_CONFIG_CSIC, .clk = 0 },
- { .data = MIPI_CAL_CONFIG_CSID, .clk = 0 },
- { .data = MIPI_CAL_CONFIG_CSIE, .clk = 0 },
- { .data = MIPI_CAL_CONFIG_CSIF, .clk = 0 },
- { .data = MIPI_CAL_CONFIG_DSIA, .clk = MIPI_CAL_CONFIG_DSIA_CLK },
- { .data = MIPI_CAL_CONFIG_DSIB, .clk = MIPI_CAL_CONFIG_DSIB_CLK },
- { .data = MIPI_CAL_CONFIG_DSIC, .clk = MIPI_CAL_CONFIG_DSIC_CLK },
- { .data = MIPI_CAL_CONFIG_DSID, .clk = MIPI_CAL_CONFIG_DSID_CLK },
- };
- static const struct tegra_mipi_soc tegra210_mipi_soc = {
- .has_clk_lane = true,
- .pads = tegra210_mipi_pads,
- .num_pads = ARRAY_SIZE(tegra210_mipi_pads),
- .clock_enable_override = true,
- .needs_vclamp_ref = false,
- .pad_drive_down_ref = 0x0,
- .pad_drive_up_ref = 0x3,
- .pad_vclamp_level = 0x1,
- .pad_vauxp_level = 0x1,
- .hspdos = 0x0,
- .hspuos = 0x2,
- .termos = 0x0,
- .hsclkpdos = 0x0,
- .hsclkpuos = 0x2,
- };
- static const struct of_device_id tegra_mipi_of_match[] = {
- { .compatible = "nvidia,tegra114-mipi", .data = &tegra114_mipi_soc },
- { .compatible = "nvidia,tegra124-mipi", .data = &tegra124_mipi_soc },
- { .compatible = "nvidia,tegra132-mipi", .data = &tegra132_mipi_soc },
- { .compatible = "nvidia,tegra210-mipi", .data = &tegra210_mipi_soc },
- { },
- };
- static int tegra_mipi_probe(struct platform_device *pdev)
- {
- const struct of_device_id *match;
- struct tegra_mipi *mipi;
- struct resource *res;
- int err;
- match = of_match_node(tegra_mipi_of_match, pdev->dev.of_node);
- if (!match)
- return -ENODEV;
- mipi = devm_kzalloc(&pdev->dev, sizeof(*mipi), GFP_KERNEL);
- if (!mipi)
- return -ENOMEM;
- mipi->soc = match->data;
- mipi->dev = &pdev->dev;
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- mipi->regs = devm_ioremap_resource(&pdev->dev, res);
- if (IS_ERR(mipi->regs))
- return PTR_ERR(mipi->regs);
- mutex_init(&mipi->lock);
- mipi->clk = devm_clk_get(&pdev->dev, NULL);
- if (IS_ERR(mipi->clk)) {
- dev_err(&pdev->dev, "failed to get clock\n");
- return PTR_ERR(mipi->clk);
- }
- err = clk_prepare(mipi->clk);
- if (err < 0)
- return err;
- platform_set_drvdata(pdev, mipi);
- return 0;
- }
- static int tegra_mipi_remove(struct platform_device *pdev)
- {
- struct tegra_mipi *mipi = platform_get_drvdata(pdev);
- clk_unprepare(mipi->clk);
- return 0;
- }
- struct platform_driver tegra_mipi_driver = {
- .driver = {
- .name = "tegra-mipi",
- .of_match_table = tegra_mipi_of_match,
- },
- .probe = tegra_mipi_probe,
- .remove = tegra_mipi_remove,
- };
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