--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2021-2022 NVIDIA Corporation
+ *
+ * Author: Dipen Patel <dipenp@nvidia.com>
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+#include <linux/interrupt.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/hte.h>
+#include <linux/uaccess.h>
+#include <linux/gpio/driver.h>
+#include <linux/gpio/consumer.h>
+
+#define HTE_SUSPEND 0
+
+/* HTE source clock TSC is 31.25MHz */
+#define HTE_TS_CLK_RATE_HZ 31250000ULL
+#define HTE_CLK_RATE_NS 32
+#define HTE_TS_NS_SHIFT __builtin_ctz(HTE_CLK_RATE_NS)
+
+#define NV_AON_SLICE_INVALID -1
+#define NV_LINES_IN_SLICE 32
+
+/* AON HTE line map For slice 1 */
+#define NV_AON_HTE_SLICE1_IRQ_GPIO_28 12
+#define NV_AON_HTE_SLICE1_IRQ_GPIO_29 13
+
+/* AON HTE line map For slice 2 */
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_0 0
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_1 1
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_2 2
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_3 3
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_4 4
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_5 5
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_6 6
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_7 7
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_8 8
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_9 9
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_10 10
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_11 11
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_12 12
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_13 13
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_14 14
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_15 15
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_16 16
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_17 17
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_18 18
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_19 19
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_20 20
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_21 21
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_22 22
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_23 23
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_24 24
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_25 25
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_26 26
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_27 27
+
+#define HTE_TECTRL 0x0
+#define HTE_TETSCH 0x4
+#define HTE_TETSCL 0x8
+#define HTE_TESRC 0xC
+#define HTE_TECCV 0x10
+#define HTE_TEPCV 0x14
+#define HTE_TECMD 0x1C
+#define HTE_TESTATUS 0x20
+#define HTE_SLICE0_TETEN 0x40
+#define HTE_SLICE1_TETEN 0x60
+
+#define HTE_SLICE_SIZE (HTE_SLICE1_TETEN - HTE_SLICE0_TETEN)
+
+#define HTE_TECTRL_ENABLE_ENABLE 0x1
+
+#define HTE_TECTRL_OCCU_SHIFT 0x8
+#define HTE_TECTRL_INTR_SHIFT 0x1
+#define HTE_TECTRL_INTR_ENABLE 0x1
+
+#define HTE_TESRC_SLICE_SHIFT 16
+#define HTE_TESRC_SLICE_DEFAULT_MASK 0xFF
+
+#define HTE_TECMD_CMD_POP 0x1
+
+#define HTE_TESTATUS_OCCUPANCY_SHIFT 8
+#define HTE_TESTATUS_OCCUPANCY_MASK 0xFF
+
+enum tegra_hte_type {
+ HTE_TEGRA_TYPE_GPIO = 1U << 0,
+ HTE_TEGRA_TYPE_LIC = 1U << 1,
+};
+
+struct hte_slices {
+ u32 r_val;
+ unsigned long flags;
+ /* to prevent lines mapped to same slice updating its register */
+ spinlock_t s_lock;
+};
+
+struct tegra_hte_line_mapped {
+ int slice;
+ u32 bit_index;
+};
+
+struct tegra_hte_line_data {
+ unsigned long flags;
+ void *data;
+};
+
+struct tegra_hte_data {
+ enum tegra_hte_type type;
+ u32 map_sz;
+ u32 sec_map_sz;
+ const struct tegra_hte_line_mapped *map;
+ const struct tegra_hte_line_mapped *sec_map;
+};
+
+struct tegra_hte_soc {
+ int hte_irq;
+ u32 itr_thrshld;
+ u32 conf_rval;
+ struct hte_slices *sl;
+ const struct tegra_hte_data *prov_data;
+ struct tegra_hte_line_data *line_data;
+ struct hte_chip *chip;
+ struct gpio_chip *c;
+ void __iomem *regs;
+};
+
+static const struct tegra_hte_line_mapped tegra194_aon_gpio_map[] = {
+ /* gpio, slice, bit_index */
+ /* AA port */
+ [0] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_11},
+ [1] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_10},
+ [2] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_9},
+ [3] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_8},
+ [4] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_7},
+ [5] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_6},
+ [6] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_5},
+ [7] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_4},
+ /* BB port */
+ [8] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_3},
+ [9] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_2},
+ [10] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_1},
+ [11] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_0},
+ /* CC port */
+ [12] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_22},
+ [13] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_21},
+ [14] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_20},
+ [15] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_19},
+ [16] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_18},
+ [17] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_17},
+ [18] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_16},
+ [19] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_15},
+ /* DD port */
+ [20] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_14},
+ [21] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_13},
+ [22] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_12},
+ /* EE port */
+ [23] = {1, NV_AON_HTE_SLICE1_IRQ_GPIO_29},
+ [24] = {1, NV_AON_HTE_SLICE1_IRQ_GPIO_28},
+ [25] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_27},
+ [26] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_26},
+ [27] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_25},
+ [28] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_24},
+ [29] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_23},
+};
+
+static const struct tegra_hte_line_mapped tegra194_aon_gpio_sec_map[] = {
+ /* gpio, slice, bit_index */
+ /* AA port */
+ [0] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_11},
+ [1] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_10},
+ [2] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_9},
+ [3] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_8},
+ [4] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_7},
+ [5] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_6},
+ [6] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_5},
+ [7] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_4},
+ /* BB port */
+ [8] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_3},
+ [9] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_2},
+ [10] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_1},
+ [11] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_0},
+ [12] = {NV_AON_SLICE_INVALID, 0},
+ [13] = {NV_AON_SLICE_INVALID, 0},
+ [14] = {NV_AON_SLICE_INVALID, 0},
+ [15] = {NV_AON_SLICE_INVALID, 0},
+ /* CC port */
+ [16] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_22},
+ [17] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_21},
+ [18] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_20},
+ [19] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_19},
+ [20] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_18},
+ [21] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_17},
+ [22] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_16},
+ [23] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_15},
+ /* DD port */
+ [24] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_14},
+ [25] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_13},
+ [26] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_12},
+ [27] = {NV_AON_SLICE_INVALID, 0},
+ [28] = {NV_AON_SLICE_INVALID, 0},
+ [29] = {NV_AON_SLICE_INVALID, 0},
+ [30] = {NV_AON_SLICE_INVALID, 0},
+ [31] = {NV_AON_SLICE_INVALID, 0},
+ /* EE port */
+ [32] = {1, NV_AON_HTE_SLICE1_IRQ_GPIO_29},
+ [33] = {1, NV_AON_HTE_SLICE1_IRQ_GPIO_28},
+ [34] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_27},
+ [35] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_26},
+ [36] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_25},
+ [37] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_24},
+ [38] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_23},
+ [39] = {NV_AON_SLICE_INVALID, 0},
+};
+
+static const struct tegra_hte_data aon_hte = {
+ .map_sz = ARRAY_SIZE(tegra194_aon_gpio_map),
+ .map = tegra194_aon_gpio_map,
+ .sec_map_sz = ARRAY_SIZE(tegra194_aon_gpio_sec_map),
+ .sec_map = tegra194_aon_gpio_sec_map,
+ .type = HTE_TEGRA_TYPE_GPIO,
+};
+
+static const struct tegra_hte_data lic_hte = {
+ .map_sz = 0,
+ .map = NULL,
+ .type = HTE_TEGRA_TYPE_LIC,
+};
+
+static inline u32 tegra_hte_readl(struct tegra_hte_soc *hte, u32 reg)
+{
+ return readl(hte->regs + reg);
+}
+
+static inline void tegra_hte_writel(struct tegra_hte_soc *hte, u32 reg,
+ u32 val)
+{
+ writel(val, hte->regs + reg);
+}
+
+static int tegra_hte_map_to_line_id(u32 eid,
+ const struct tegra_hte_line_mapped *m,
+ u32 map_sz, u32 *mapped)
+{
+
+ if (m) {
+ if (eid > map_sz)
+ return -EINVAL;
+ if (m[eid].slice == NV_AON_SLICE_INVALID)
+ return -EINVAL;
+
+ *mapped = (m[eid].slice << 5) + m[eid].bit_index;
+ } else {
+ *mapped = eid;
+ }
+
+ return 0;
+}
+
+static int tegra_hte_line_xlate(struct hte_chip *gc,
+ const struct of_phandle_args *args,
+ struct hte_ts_desc *desc, u32 *xlated_id)
+{
+ int ret = 0;
+ u32 line_id;
+ struct tegra_hte_soc *gs;
+ const struct tegra_hte_line_mapped *map = NULL;
+ u32 map_sz = 0;
+
+ if (!gc || !desc || !xlated_id)
+ return -EINVAL;
+
+ if (args) {
+ if (gc->of_hte_n_cells < 1)
+ return -EINVAL;
+
+ if (args->args_count != gc->of_hte_n_cells)
+ return -EINVAL;
+
+ desc->attr.line_id = args->args[0];
+ }
+
+ gs = gc->data;
+ if (!gs || !gs->prov_data)
+ return -EINVAL;
+
+ /*
+ *
+ * There are two paths GPIO consumers can take as follows:
+ * 1) The consumer (gpiolib-cdev for example) which uses GPIO global
+ * number which gets assigned run time.
+ * 2) The consumer passing GPIO from the DT which is assigned
+ * statically for example by using TEGRA194_AON_GPIO gpio DT binding.
+ *
+ * The code below addresses both the consumer use cases and maps into
+ * HTE/GTE namespace.
+ */
+ if (gs->prov_data->type == HTE_TEGRA_TYPE_GPIO && !args) {
+ line_id = desc->attr.line_id - gs->c->base;
+ map = gs->prov_data->map;
+ map_sz = gs->prov_data->map_sz;
+ } else if (gs->prov_data->type == HTE_TEGRA_TYPE_GPIO && args) {
+ line_id = desc->attr.line_id;
+ map = gs->prov_data->sec_map;
+ map_sz = gs->prov_data->sec_map_sz;
+ } else {
+ line_id = desc->attr.line_id;
+ }
+
+ ret = tegra_hte_map_to_line_id(line_id, map, map_sz, xlated_id);
+ if (ret < 0) {
+ dev_err(gc->dev, "line_id:%u mapping failed\n",
+ desc->attr.line_id);
+ return ret;
+ }
+
+ if (*xlated_id > gc->nlines)
+ return -EINVAL;
+
+ dev_dbg(gc->dev, "requested id:%u, xlated id:%u\n",
+ desc->attr.line_id, *xlated_id);
+
+ return 0;
+}
+
+static int tegra_hte_line_xlate_plat(struct hte_chip *gc,
+ struct hte_ts_desc *desc, u32 *xlated_id)
+{
+ return tegra_hte_line_xlate(gc, NULL, desc, xlated_id);
+}
+
+static int tegra_hte_en_dis_common(struct hte_chip *chip, u32 line_id, bool en)
+{
+ u32 slice, sl_bit_shift, line_bit, val, reg;
+ struct tegra_hte_soc *gs;
+
+ sl_bit_shift = __builtin_ctz(HTE_SLICE_SIZE);
+
+ if (!chip)
+ return -EINVAL;
+
+ gs = chip->data;
+
+ if (line_id > chip->nlines) {
+ dev_err(chip->dev,
+ "line id: %u is not supported by this controller\n",
+ line_id);
+ return -EINVAL;
+ }
+
+ slice = line_id >> sl_bit_shift;
+ line_bit = line_id & (HTE_SLICE_SIZE - 1);
+ reg = (slice << sl_bit_shift) + HTE_SLICE0_TETEN;
+
+ spin_lock(&gs->sl[slice].s_lock);
+
+ if (test_bit(HTE_SUSPEND, &gs->sl[slice].flags)) {
+ spin_unlock(&gs->sl[slice].s_lock);
+ dev_dbg(chip->dev, "device suspended");
+ return -EBUSY;
+ }
+
+ val = tegra_hte_readl(gs, reg);
+ if (en)
+ val = val | (1 << line_bit);
+ else
+ val = val & (~(1 << line_bit));
+ tegra_hte_writel(gs, reg, val);
+
+ spin_unlock(&gs->sl[slice].s_lock);
+
+ dev_dbg(chip->dev, "line: %u, slice %u, line_bit %u, reg:0x%x\n",
+ line_id, slice, line_bit, reg);
+
+ return 0;
+}
+
+static int tegra_hte_enable(struct hte_chip *chip, u32 line_id)
+{
+ if (!chip)
+ return -EINVAL;
+
+ return tegra_hte_en_dis_common(chip, line_id, true);
+}
+
+static int tegra_hte_disable(struct hte_chip *chip, u32 line_id)
+{
+ if (!chip)
+ return -EINVAL;
+
+ return tegra_hte_en_dis_common(chip, line_id, false);
+}
+
+static int tegra_hte_request(struct hte_chip *chip, struct hte_ts_desc *desc,
+ u32 line_id)
+{
+ int ret;
+ struct tegra_hte_soc *gs;
+ struct hte_line_attr *attr;
+
+ if (!chip || !chip->data || !desc)
+ return -EINVAL;
+
+ gs = chip->data;
+ attr = &desc->attr;
+
+ if (gs->prov_data->type == HTE_TEGRA_TYPE_GPIO) {
+ if (!attr->line_data)
+ return -EINVAL;
+
+ ret = gpiod_enable_hw_timestamp_ns(attr->line_data,
+ attr->edge_flags);
+ if (ret)
+ return ret;
+
+ gs->line_data[line_id].data = attr->line_data;
+ gs->line_data[line_id].flags = attr->edge_flags;
+ }
+
+ return tegra_hte_en_dis_common(chip, line_id, true);
+}
+
+static int tegra_hte_release(struct hte_chip *chip, struct hte_ts_desc *desc,
+ u32 line_id)
+{
+ struct tegra_hte_soc *gs;
+ struct hte_line_attr *attr;
+ int ret;
+
+ if (!chip || !chip->data || !desc)
+ return -EINVAL;
+
+ gs = chip->data;
+ attr = &desc->attr;
+
+ if (gs->prov_data->type == HTE_TEGRA_TYPE_GPIO) {
+ ret = gpiod_disable_hw_timestamp_ns(attr->line_data,
+ gs->line_data[line_id].flags);
+ if (ret)
+ return ret;
+
+ gs->line_data[line_id].data = NULL;
+ gs->line_data[line_id].flags = 0;
+ }
+
+ return tegra_hte_en_dis_common(chip, line_id, false);
+}
+
+static int tegra_hte_clk_src_info(struct hte_chip *chip,
+ struct hte_clk_info *ci)
+{
+ (void)chip;
+
+ if (!ci)
+ return -EINVAL;
+
+ ci->hz = HTE_TS_CLK_RATE_HZ;
+ ci->type = CLOCK_MONOTONIC;
+
+ return 0;
+}
+
+static int tegra_hte_get_level(struct tegra_hte_soc *gs, u32 line_id)
+{
+ struct gpio_desc *desc;
+
+ if (gs->prov_data->type == HTE_TEGRA_TYPE_GPIO) {
+ desc = gs->line_data[line_id].data;
+ if (desc)
+ return gpiod_get_raw_value(desc);
+ }
+
+ return -1;
+}
+
+static void tegra_hte_read_fifo(struct tegra_hte_soc *gs)
+{
+ u32 tsh, tsl, src, pv, cv, acv, slice, bit_index, line_id;
+ u64 tsc;
+ struct hte_ts_data el;
+
+ while ((tegra_hte_readl(gs, HTE_TESTATUS) >>
+ HTE_TESTATUS_OCCUPANCY_SHIFT) &
+ HTE_TESTATUS_OCCUPANCY_MASK) {
+ tsh = tegra_hte_readl(gs, HTE_TETSCH);
+ tsl = tegra_hte_readl(gs, HTE_TETSCL);
+ tsc = (((u64)tsh << 32) | tsl);
+
+ src = tegra_hte_readl(gs, HTE_TESRC);
+ slice = (src >> HTE_TESRC_SLICE_SHIFT) &
+ HTE_TESRC_SLICE_DEFAULT_MASK;
+
+ pv = tegra_hte_readl(gs, HTE_TEPCV);
+ cv = tegra_hte_readl(gs, HTE_TECCV);
+ acv = pv ^ cv;
+ while (acv) {
+ bit_index = __builtin_ctz(acv);
+ line_id = bit_index + (slice << 5);
+ el.tsc = tsc << HTE_TS_NS_SHIFT;
+ el.raw_level = tegra_hte_get_level(gs, line_id);
+ hte_push_ts_ns(gs->chip, line_id, &el);
+ acv &= ~BIT(bit_index);
+ }
+ tegra_hte_writel(gs, HTE_TECMD, HTE_TECMD_CMD_POP);
+ }
+}
+
+static irqreturn_t tegra_hte_isr(int irq, void *dev_id)
+{
+ struct tegra_hte_soc *gs = dev_id;
+ (void)irq;
+
+ tegra_hte_read_fifo(gs);
+
+ return IRQ_HANDLED;
+}
+
+static bool tegra_hte_match_from_linedata(const struct hte_chip *chip,
+ const struct hte_ts_desc *hdesc)
+{
+ struct tegra_hte_soc *hte_dev = chip->data;
+
+ if (!hte_dev || (hte_dev->prov_data->type != HTE_TEGRA_TYPE_GPIO))
+ return false;
+
+ return hte_dev->c == gpiod_to_chip(hdesc->attr.line_data);
+}
+
+static const struct of_device_id tegra_hte_of_match[] = {
+ { .compatible = "nvidia,tegra194-gte-lic", .data = &lic_hte},
+ { .compatible = "nvidia,tegra194-gte-aon", .data = &aon_hte},
+ { }
+};
+MODULE_DEVICE_TABLE(of, tegra_hte_of_match);
+
+static const struct hte_ops g_ops = {
+ .request = tegra_hte_request,
+ .release = tegra_hte_release,
+ .enable = tegra_hte_enable,
+ .disable = tegra_hte_disable,
+ .get_clk_src_info = tegra_hte_clk_src_info,
+};
+
+static void tegra_gte_disable(void *data)
+{
+ struct platform_device *pdev = data;
+ struct tegra_hte_soc *gs = dev_get_drvdata(&pdev->dev);
+
+ tegra_hte_writel(gs, HTE_TECTRL, 0);
+}
+
+static int tegra_get_gpiochip_from_name(struct gpio_chip *chip, void *data)
+{
+ return !strcmp(chip->label, data);
+}
+
+static int tegra_hte_probe(struct platform_device *pdev)
+{
+ int ret;
+ u32 i, slices, val = 0;
+ u32 nlines;
+ struct device *dev;
+ struct tegra_hte_soc *hte_dev;
+ struct hte_chip *gc;
+
+ dev = &pdev->dev;
+
+ ret = of_property_read_u32(dev->of_node, "nvidia,slices", &slices);
+ if (ret != 0) {
+ dev_err(dev, "Could not read slices\n");
+ return -EINVAL;
+ }
+ nlines = slices << 5;
+
+ hte_dev = devm_kzalloc(dev, sizeof(*hte_dev), GFP_KERNEL);
+ if (!hte_dev)
+ return -ENOMEM;
+
+ gc = devm_kzalloc(dev, sizeof(*gc), GFP_KERNEL);
+ if (!gc)
+ return -ENOMEM;
+
+ dev_set_drvdata(&pdev->dev, hte_dev);
+ hte_dev->prov_data = of_device_get_match_data(&pdev->dev);
+
+ hte_dev->regs = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(hte_dev->regs))
+ return PTR_ERR(hte_dev->regs);
+
+ ret = of_property_read_u32(dev->of_node, "nvidia,int-threshold",
+ &hte_dev->itr_thrshld);
+ if (ret != 0)
+ hte_dev->itr_thrshld = 1;
+
+ hte_dev->sl = devm_kcalloc(dev, slices, sizeof(*hte_dev->sl),
+ GFP_KERNEL);
+ if (!hte_dev->sl)
+ return -ENOMEM;
+
+ ret = platform_get_irq(pdev, 0);
+ if (ret < 0) {
+ dev_err_probe(dev, ret, "failed to get irq\n");
+ return ret;
+ }
+ hte_dev->hte_irq = ret;
+ ret = devm_request_irq(dev, hte_dev->hte_irq, tegra_hte_isr, 0,
+ dev_name(dev), hte_dev);
+ if (ret < 0) {
+ dev_err(dev, "request irq failed.\n");
+ return ret;
+ }
+
+ gc->nlines = nlines;
+ gc->ops = &g_ops;
+ gc->dev = dev;
+ gc->data = hte_dev;
+ gc->xlate_of = tegra_hte_line_xlate;
+ gc->xlate_plat = tegra_hte_line_xlate_plat;
+ gc->of_hte_n_cells = 1;
+
+ if (hte_dev->prov_data &&
+ hte_dev->prov_data->type == HTE_TEGRA_TYPE_GPIO) {
+ hte_dev->line_data = devm_kcalloc(dev, nlines,
+ sizeof(*hte_dev->line_data),
+ GFP_KERNEL);
+ if (!hte_dev->line_data)
+ return -ENOMEM;
+
+ gc->match_from_linedata = tegra_hte_match_from_linedata;
+
+ hte_dev->c = gpiochip_find("tegra194-gpio-aon",
+ tegra_get_gpiochip_from_name);
+ if (!hte_dev->c)
+ return dev_err_probe(dev, -EPROBE_DEFER,
+ "wait for gpio controller\n");
+ }
+
+ hte_dev->chip = gc;
+
+ ret = devm_hte_register_chip(hte_dev->chip);
+ if (ret) {
+ dev_err(gc->dev, "hte chip register failed");
+ return ret;
+ }
+
+ for (i = 0; i < slices; i++) {
+ hte_dev->sl[i].flags = 0;
+ spin_lock_init(&hte_dev->sl[i].s_lock);
+ }
+
+ val = HTE_TECTRL_ENABLE_ENABLE |
+ (HTE_TECTRL_INTR_ENABLE << HTE_TECTRL_INTR_SHIFT) |
+ (hte_dev->itr_thrshld << HTE_TECTRL_OCCU_SHIFT);
+ tegra_hte_writel(hte_dev, HTE_TECTRL, val);
+
+ ret = devm_add_action_or_reset(&pdev->dev, tegra_gte_disable, pdev);
+ if (ret)
+ return ret;
+
+ dev_dbg(gc->dev, "lines: %d, slices:%d", gc->nlines, slices);
+
+ return 0;
+}
+
+static int __maybe_unused tegra_hte_resume_early(struct device *dev)
+{
+ u32 i;
+ struct tegra_hte_soc *gs = dev_get_drvdata(dev);
+ u32 slices = gs->chip->nlines / NV_LINES_IN_SLICE;
+ u32 sl_bit_shift = __builtin_ctz(HTE_SLICE_SIZE);
+
+ tegra_hte_writel(gs, HTE_TECTRL, gs->conf_rval);
+
+ for (i = 0; i < slices; i++) {
+ spin_lock(&gs->sl[i].s_lock);
+ tegra_hte_writel(gs,
+ ((i << sl_bit_shift) + HTE_SLICE0_TETEN),
+ gs->sl[i].r_val);
+ clear_bit(HTE_SUSPEND, &gs->sl[i].flags);
+ spin_unlock(&gs->sl[i].s_lock);
+ }
+
+ return 0;
+}
+
+static int __maybe_unused tegra_hte_suspend_late(struct device *dev)
+{
+ u32 i;
+ struct tegra_hte_soc *gs = dev_get_drvdata(dev);
+ u32 slices = gs->chip->nlines / NV_LINES_IN_SLICE;
+ u32 sl_bit_shift = __builtin_ctz(HTE_SLICE_SIZE);
+
+ gs->conf_rval = tegra_hte_readl(gs, HTE_TECTRL);
+ for (i = 0; i < slices; i++) {
+ spin_lock(&gs->sl[i].s_lock);
+ gs->sl[i].r_val = tegra_hte_readl(gs,
+ ((i << sl_bit_shift) + HTE_SLICE0_TETEN));
+ set_bit(HTE_SUSPEND, &gs->sl[i].flags);
+ spin_unlock(&gs->sl[i].s_lock);
+ }
+
+ return 0;
+}
+
+static const struct dev_pm_ops tegra_hte_pm = {
+ SET_LATE_SYSTEM_SLEEP_PM_OPS(tegra_hte_suspend_late,
+ tegra_hte_resume_early)
+};
+
+static struct platform_driver tegra_hte_driver = {
+ .probe = tegra_hte_probe,
+ .driver = {
+ .name = "tegra_hte",
+ .pm = &tegra_hte_pm,
+ .of_match_table = tegra_hte_of_match,
+ },
+};
+
+module_platform_driver(tegra_hte_driver);
+
+MODULE_AUTHOR("Dipen Patel <dipenp@nvidia.com>");
+MODULE_DESCRIPTION("NVIDIA Tegra HTE (Hardware Timestamping Engine) driver");
+MODULE_LICENSE("GPL");
projects / platform / kernel / linux-rpi.git / commitdiff