diff options
| -rw-r--r-- | Documentation/hte/index.rst | 22 | ||||
| -rw-r--r-- | Documentation/hte/tegra194-hte.rst | 49 | ||||
| -rw-r--r-- | Documentation/index.rst | 1 | ||||
| -rw-r--r-- | drivers/hte/Kconfig | 12 | ||||
| -rw-r--r-- | drivers/hte/Makefile | 1 | ||||
| -rw-r--r-- | drivers/hte/hte-tegra194.c | 730 |
6 files changed, 815 insertions, 0 deletions
diff --git a/Documentation/hte/index.rst b/Documentation/hte/index.rst new file mode 100644 index 000000000000..9f43301c05dc --- /dev/null +++ b/Documentation/hte/index.rst @@ -0,0 +1,22 @@ +.. SPDX-License-Identifier: GPL-2.0 + +============================================ +The Linux Hardware Timestamping Engine (HTE) +============================================ + +The HTE Subsystem +================= + +.. toctree:: + :maxdepth: 1 + + hte + +HTE Tegra Provider +================== + +.. toctree:: + :maxdepth: 1 + + tegra194-hte + diff --git a/Documentation/hte/tegra194-hte.rst b/Documentation/hte/tegra194-hte.rst new file mode 100644 index 000000000000..41983e04d2a0 --- /dev/null +++ b/Documentation/hte/tegra194-hte.rst @@ -0,0 +1,49 @@ +.. SPDX-License-Identifier: GPL-2.0+ + +HTE Kernel provider driver +========================== + +Description +----------- +The Nvidia tegra194 HTE provider driver implements two GTE +(Generic Timestamping Engine) instances: 1) GPIO GTE and 2) LIC +(Legacy Interrupt Controller) IRQ GTE. Both GTE instances get the +timestamp from the system counter TSC which has 31.25MHz clock rate, and the +driver converts clock tick rate to nanoseconds before storing it as timestamp +value. + +GPIO GTE +-------- + +This GTE instance timestamps GPIO in real time. For that to happen GPIO +needs to be configured as input. The always on (AON) GPIO controller instance +supports timestamping GPIOs in real time and it has 39 GPIO lines. The GPIO GTE +and AON GPIO controller are tightly coupled as it requires very specific bits +to be set in GPIO config register before GPIO GTE can be used, for that GPIOLIB +adds two optional APIs as below. The GPIO GTE code supports both kernel +and userspace consumers. The kernel space consumers can directly talk to HTE +subsystem while userspace consumers timestamp requests go through GPIOLIB CDEV +framework to HTE subsystem. + +.. kernel-doc:: drivers/gpio/gpiolib.c + :functions: gpiod_enable_hw_timestamp_ns gpiod_disable_hw_timestamp_ns + +For userspace consumers, GPIO_V2_LINE_FLAG_EVENT_CLOCK_HTE flag must be +specified during IOCTL calls. Refer to ``tools/gpio/gpio-event-mon.c``, which +returns the timestamp in nanoseconds. + +LIC (Legacy Interrupt Controller) IRQ GTE +----------------------------------------- + +This GTE instance timestamps LIC IRQ lines in real time. There are 352 IRQ +lines which this instance can add timestamps to in real time. The hte +devicetree binding described at ``Documentation/devicetree/bindings/hte/`` +provides an example of how a consumer can request an IRQ line. Since it is a +one-to-one mapping with IRQ GTE provider, consumers can simply specify the IRQ +number that they are interested in. There is no userspace consumer support for +this GTE instance in the HTE framework. + +The provider source code of both IRQ and GPIO GTE instances is located at +``drivers/hte/hte-tegra194.c``. The test driver +``drivers/hte/hte-tegra194-test.c`` demonstrates HTE API usage for both IRQ +and GPIO GTE. diff --git a/Documentation/index.rst b/Documentation/index.rst index 1988c19d9daf..1987481866e1 100644 --- a/Documentation/index.rst +++ b/Documentation/index.rst @@ -139,6 +139,7 @@ needed). mhi/index tty/index peci/index + hte/index Architecture-agnostic documentation ----------------------------------- diff --git a/drivers/hte/Kconfig b/drivers/hte/Kconfig index 478a80a2f384..3bd0fa367e84 100644 --- a/drivers/hte/Kconfig +++ b/drivers/hte/Kconfig @@ -12,3 +12,15 @@ menuconfig HTE If unsure, say no. +if HTE + +config HTE_TEGRA194 + tristate "NVIDIA Tegra194 HTE Support" + depends on ARCH_TEGRA_194_SOC + help + Enable this option for integrated hardware timestamping engine also + known as generic timestamping engine (GTE) support on NVIDIA Tegra194 + systems-on-chip. The driver supports 352 LIC IRQs and 39 AON GPIOs + lines for timestamping in realtime. + +endif diff --git a/drivers/hte/Makefile b/drivers/hte/Makefile index fc03bdf44427..3ae7c4029991 100644 --- a/drivers/hte/Makefile +++ b/drivers/hte/Makefile @@ -1,2 +1,3 @@ obj-$(CONFIG_HTE) += hte.o +obj-$(CONFIG_HTE_TEGRA194) += hte-tegra194.o diff --git a/drivers/hte/hte-tegra194.c b/drivers/hte/hte-tegra194.c new file mode 100644 index 000000000000..49a27af22742 --- /dev/null +++ b/drivers/hte/hte-tegra194.c @@ -0,0 +1,730 @@ +// 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"); |