diff options
author | Olof Johansson <olof@lixom.net> | 2020-01-16 21:41:47 +0300 |
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committer | Olof Johansson <olof@lixom.net> | 2020-01-16 21:41:48 +0300 |
commit | 083b4db857310ad269fc49e0019dd0f8fee305d3 (patch) | |
tree | 787492e698db0267e69eb97a9c428f562de84c88 /drivers/memory | |
parent | 0d241c3f9519f3858aef126d72a728f37b935dac (diff) | |
parent | 5e5eca6644873da93f5a32904f43220380f34e88 (diff) | |
download | linux-083b4db857310ad269fc49e0019dd0f8fee305d3.tar.xz |
Merge tag 'tegra-for-5.6-memory' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux into arm/drivers
memory: tegra: Changes for v5.6-rc1
This adds a couple of fixes for the Tegra30 EMC frequency scaling code
and adds support for EMC frequency scaling on Tegra186 and later.
* tag 'tegra-for-5.6-memory' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux:
memory: tegra30-emc: Correct error message for timed out auto calibration
memory: tegra30-emc: Firm up hardware programming sequence
memory: tegra30-emc: Firm up suspend/resume sequence
memory: tegra: Correct reset value of xusb_hostr
memory: tegra: Add support for the Tegra194 memory controller
memory: tegra: Only include support for enabled SoCs
memory: tegra: Support DVFS on Tegra186 and later
memory: tegra: Add system sleep support
memory: tegra: Extract memory client SID programming
memory: tegra: Add per-SoC data for Tegra186
memory: tegra: Rename tegra_mc to tegra186_mc on Tegra186
memory: tegra: Implement EMC debugfs interface on Tegra30
memory: tegra: Implement EMC debugfs interface on Tegra20
memory: tegra: Refashion EMC debugfs interface on Tegra124
Link: https://lore.kernel.org/r/20200111003553.2411874-3-thierry.reding@gmail.com
Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'drivers/memory')
-rw-r--r-- | drivers/memory/tegra/Makefile | 3 | ||||
-rw-r--r-- | drivers/memory/tegra/tegra124-emc.c | 185 | ||||
-rw-r--r-- | drivers/memory/tegra/tegra186-emc.c | 293 | ||||
-rw-r--r-- | drivers/memory/tegra/tegra186.c | 1067 | ||||
-rw-r--r-- | drivers/memory/tegra/tegra20-emc.c | 175 | ||||
-rw-r--r-- | drivers/memory/tegra/tegra210.c | 2 | ||||
-rw-r--r-- | drivers/memory/tegra/tegra30-emc.c | 352 |
7 files changed, 1928 insertions, 149 deletions
diff --git a/drivers/memory/tegra/Makefile b/drivers/memory/tegra/Makefile index 3d23c4261104..529d10bc5650 100644 --- a/drivers/memory/tegra/Makefile +++ b/drivers/memory/tegra/Makefile @@ -13,4 +13,5 @@ obj-$(CONFIG_TEGRA_MC) += tegra-mc.o obj-$(CONFIG_TEGRA20_EMC) += tegra20-emc.o obj-$(CONFIG_TEGRA30_EMC) += tegra30-emc.o obj-$(CONFIG_TEGRA124_EMC) += tegra124-emc.o -obj-$(CONFIG_ARCH_TEGRA_186_SOC) += tegra186.o +obj-$(CONFIG_ARCH_TEGRA_186_SOC) += tegra186.o tegra186-emc.o +obj-$(CONFIG_ARCH_TEGRA_194_SOC) += tegra186.o tegra186-emc.o diff --git a/drivers/memory/tegra/tegra124-emc.c b/drivers/memory/tegra/tegra124-emc.c index 464f0ceaee63..21f05240682b 100644 --- a/drivers/memory/tegra/tegra124-emc.c +++ b/drivers/memory/tegra/tegra124-emc.c @@ -467,12 +467,20 @@ struct tegra_emc { void __iomem *regs; + struct clk *clk; + enum emc_dram_type dram_type; unsigned int dram_num; struct emc_timing last_timing; struct emc_timing *timings; unsigned int num_timings; + + struct { + struct dentry *root; + unsigned long min_rate; + unsigned long max_rate; + } debugfs; }; /* Timing change sequence functions */ @@ -998,38 +1006,51 @@ tegra_emc_find_node_by_ram_code(struct device_node *node, u32 ram_code) return NULL; } -/* Debugfs entry */ +/* + * debugfs interface + * + * The memory controller driver exposes some files in debugfs that can be used + * to control the EMC frequency. The top-level directory can be found here: + * + * /sys/kernel/debug/emc + * + * It contains the following files: + * + * - available_rates: This file contains a list of valid, space-separated + * EMC frequencies. + * + * - min_rate: Writing a value to this file sets the given frequency as the + * floor of the permitted range. If this is higher than the currently + * configured EMC frequency, this will cause the frequency to be + * increased so that it stays within the valid range. + * + * - max_rate: Similarily to the min_rate file, writing a value to this file + * sets the given frequency as the ceiling of the permitted range. If + * the value is lower than the currently configured EMC frequency, this + * will cause the frequency to be decreased so that it stays within the + * valid range. + */ -static int emc_debug_rate_get(void *data, u64 *rate) +static bool tegra_emc_validate_rate(struct tegra_emc *emc, unsigned long rate) { - struct clk *c = data; - - *rate = clk_get_rate(c); - - return 0; -} + unsigned int i; -static int emc_debug_rate_set(void *data, u64 rate) -{ - struct clk *c = data; + for (i = 0; i < emc->num_timings; i++) + if (rate == emc->timings[i].rate) + return true; - return clk_set_rate(c, rate); + return false; } -DEFINE_SIMPLE_ATTRIBUTE(emc_debug_rate_fops, emc_debug_rate_get, - emc_debug_rate_set, "%lld\n"); - -static int emc_debug_supported_rates_show(struct seq_file *s, void *data) +static int tegra_emc_debug_available_rates_show(struct seq_file *s, + void *data) { struct tegra_emc *emc = s->private; const char *prefix = ""; unsigned int i; for (i = 0; i < emc->num_timings; i++) { - struct emc_timing *timing = &emc->timings[i]; - - seq_printf(s, "%s%lu", prefix, timing->rate); - + seq_printf(s, "%s%lu", prefix, emc->timings[i].rate); prefix = " "; } @@ -1038,46 +1059,126 @@ static int emc_debug_supported_rates_show(struct seq_file *s, void *data) return 0; } -static int emc_debug_supported_rates_open(struct inode *inode, - struct file *file) +static int tegra_emc_debug_available_rates_open(struct inode *inode, + struct file *file) { - return single_open(file, emc_debug_supported_rates_show, + return single_open(file, tegra_emc_debug_available_rates_show, inode->i_private); } -static const struct file_operations emc_debug_supported_rates_fops = { - .open = emc_debug_supported_rates_open, +static const struct file_operations tegra_emc_debug_available_rates_fops = { + .open = tegra_emc_debug_available_rates_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; +static int tegra_emc_debug_min_rate_get(void *data, u64 *rate) +{ + struct tegra_emc *emc = data; + + *rate = emc->debugfs.min_rate; + + return 0; +} + +static int tegra_emc_debug_min_rate_set(void *data, u64 rate) +{ + struct tegra_emc *emc = data; + int err; + + if (!tegra_emc_validate_rate(emc, rate)) + return -EINVAL; + + err = clk_set_min_rate(emc->clk, rate); + if (err < 0) + return err; + + emc->debugfs.min_rate = rate; + + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(tegra_emc_debug_min_rate_fops, + tegra_emc_debug_min_rate_get, + tegra_emc_debug_min_rate_set, "%llu\n"); + +static int tegra_emc_debug_max_rate_get(void *data, u64 *rate) +{ + struct tegra_emc *emc = data; + + *rate = emc->debugfs.max_rate; + + return 0; +} + +static int tegra_emc_debug_max_rate_set(void *data, u64 rate) +{ + struct tegra_emc *emc = data; + int err; + + if (!tegra_emc_validate_rate(emc, rate)) + return -EINVAL; + + err = clk_set_max_rate(emc->clk, rate); + if (err < 0) + return err; + + emc->debugfs.max_rate = rate; + + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(tegra_emc_debug_max_rate_fops, + tegra_emc_debug_max_rate_get, + tegra_emc_debug_max_rate_set, "%llu\n"); + static void emc_debugfs_init(struct device *dev, struct tegra_emc *emc) { - struct dentry *root, *file; - struct clk *clk; + unsigned int i; + int err; - root = debugfs_create_dir("emc", NULL); - if (!root) { - dev_err(dev, "failed to create debugfs directory\n"); - return; + emc->clk = devm_clk_get(dev, "emc"); + if (IS_ERR(emc->clk)) { + if (PTR_ERR(emc->clk) != -ENODEV) { + dev_err(dev, "failed to get EMC clock: %ld\n", + PTR_ERR(emc->clk)); + return; + } } - clk = clk_get_sys("tegra-clk-debug", "emc"); - if (IS_ERR(clk)) { - dev_err(dev, "failed to get debug clock: %ld\n", PTR_ERR(clk)); + emc->debugfs.min_rate = ULONG_MAX; + emc->debugfs.max_rate = 0; + + for (i = 0; i < emc->num_timings; i++) { + if (emc->timings[i].rate < emc->debugfs.min_rate) + emc->debugfs.min_rate = emc->timings[i].rate; + + if (emc->timings[i].rate > emc->debugfs.max_rate) + emc->debugfs.max_rate = emc->timings[i].rate; + } + + err = clk_set_rate_range(emc->clk, emc->debugfs.min_rate, + emc->debugfs.max_rate); + if (err < 0) { + dev_err(dev, "failed to set rate range [%lu-%lu] for %pC\n", + emc->debugfs.min_rate, emc->debugfs.max_rate, + emc->clk); return; } - file = debugfs_create_file("rate", S_IRUGO | S_IWUSR, root, clk, - &emc_debug_rate_fops); - if (!file) - dev_err(dev, "failed to create debugfs entry\n"); + emc->debugfs.root = debugfs_create_dir("emc", NULL); + if (!emc->debugfs.root) { + dev_err(dev, "failed to create debugfs directory\n"); + return; + } - file = debugfs_create_file("supported_rates", S_IRUGO, root, emc, - &emc_debug_supported_rates_fops); - if (!file) - dev_err(dev, "failed to create debugfs entry\n"); + debugfs_create_file("available_rates", S_IRUGO, emc->debugfs.root, emc, + &tegra_emc_debug_available_rates_fops); + debugfs_create_file("min_rate", S_IRUGO | S_IWUSR, emc->debugfs.root, + emc, &tegra_emc_debug_min_rate_fops); + debugfs_create_file("max_rate", S_IRUGO | S_IWUSR, emc->debugfs.root, + emc, &tegra_emc_debug_max_rate_fops); } static int tegra_emc_probe(struct platform_device *pdev) diff --git a/drivers/memory/tegra/tegra186-emc.c b/drivers/memory/tegra/tegra186-emc.c new file mode 100644 index 000000000000..97f26bc77ad4 --- /dev/null +++ b/drivers/memory/tegra/tegra186-emc.c @@ -0,0 +1,293 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2019 NVIDIA CORPORATION. All rights reserved. + */ + +#include <linux/clk.h> +#include <linux/debugfs.h> +#include <linux/module.h> +#include <linux/mod_devicetable.h> +#include <linux/platform_device.h> + +#include <soc/tegra/bpmp.h> + +struct tegra186_emc_dvfs { + unsigned long latency; + unsigned long rate; +}; + +struct tegra186_emc { + struct tegra_bpmp *bpmp; + struct device *dev; + struct clk *clk; + + struct tegra186_emc_dvfs *dvfs; + unsigned int num_dvfs; + + struct { + struct dentry *root; + unsigned long min_rate; + unsigned long max_rate; + } debugfs; +}; + +/* + * debugfs interface + * + * The memory controller driver exposes some files in debugfs that can be used + * to control the EMC frequency. The top-level directory can be found here: + * + * /sys/kernel/debug/emc + * + * It contains the following files: + * + * - available_rates: This file contains a list of valid, space-separated + * EMC frequencies. + * + * - min_rate: Writing a value to this file sets the given frequency as the + * floor of the permitted range. If this is higher than the currently + * configured EMC frequency, this will cause the frequency to be + * increased so that it stays within the valid range. + * + * - max_rate: Similarily to the min_rate file, writing a value to this file + * sets the given frequency as the ceiling of the permitted range. If + * the value is lower than the currently configured EMC frequency, this + * will cause the frequency to be decreased so that it stays within the + * valid range. + */ + +static bool tegra186_emc_validate_rate(struct tegra186_emc *emc, + unsigned long rate) +{ + unsigned int i; + + for (i = 0; i < emc->num_dvfs; i++) + if (rate == emc->dvfs[i].rate) + return true; + + return false; +} + +static int tegra186_emc_debug_available_rates_show(struct seq_file *s, + void *data) +{ + struct tegra186_emc *emc = s->private; + const char *prefix = ""; + unsigned int i; + + for (i = 0; i < emc->num_dvfs; i++) { + seq_printf(s, "%s%lu", prefix, emc->dvfs[i].rate); + prefix = " "; + } + + seq_puts(s, "\n"); + + return 0; +} + +static int tegra186_emc_debug_available_rates_open(struct inode *inode, + struct file *file) +{ + return single_open(file, tegra186_emc_debug_available_rates_show, + inode->i_private); +} + +static const struct file_operations tegra186_emc_debug_available_rates_fops = { + .open = tegra186_emc_debug_available_rates_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int tegra186_emc_debug_min_rate_get(void *data, u64 *rate) +{ + struct tegra186_emc *emc = data; + + *rate = emc->debugfs.min_rate; + + return 0; +} + +static int tegra186_emc_debug_min_rate_set(void *data, u64 rate) +{ + struct tegra186_emc *emc = data; + int err; + + if (!tegra186_emc_validate_rate(emc, rate)) + return -EINVAL; + + err = clk_set_min_rate(emc->clk, rate); + if (err < 0) + return err; + + emc->debugfs.min_rate = rate; + + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(tegra186_emc_debug_min_rate_fops, + tegra186_emc_debug_min_rate_get, + tegra186_emc_debug_min_rate_set, "%llu\n"); + +static int tegra186_emc_debug_max_rate_get(void *data, u64 *rate) +{ + struct tegra186_emc *emc = data; + + *rate = emc->debugfs.max_rate; + + return 0; +} + +static int tegra186_emc_debug_max_rate_set(void *data, u64 rate) +{ + struct tegra186_emc *emc = data; + int err; + + if (!tegra186_emc_validate_rate(emc, rate)) + return -EINVAL; + + err = clk_set_max_rate(emc->clk, rate); + if (err < 0) + return err; + + emc->debugfs.max_rate = rate; + + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(tegra186_emc_debug_max_rate_fops, + tegra186_emc_debug_max_rate_get, + tegra186_emc_debug_max_rate_set, "%llu\n"); + +static int tegra186_emc_probe(struct platform_device *pdev) +{ + struct mrq_emc_dvfs_latency_response response; + struct tegra_bpmp_message msg; + struct tegra186_emc *emc; + unsigned int i; + int err; + + emc = devm_kzalloc(&pdev->dev, sizeof(*emc), GFP_KERNEL); + if (!emc) + return -ENOMEM; + + emc->bpmp = tegra_bpmp_get(&pdev->dev); + if (IS_ERR(emc->bpmp)) { + err = PTR_ERR(emc->bpmp); + + if (err != -EPROBE_DEFER) + dev_err(&pdev->dev, "failed to get BPMP: %d\n", err); + + return err; + } + + emc->clk = devm_clk_get(&pdev->dev, "emc"); + if (IS_ERR(emc->clk)) { + err = PTR_ERR(emc->clk); + dev_err(&pdev->dev, "failed to get EMC clock: %d\n", err); + return err; + } + + platform_set_drvdata(pdev, emc); + emc->dev = &pdev->dev; + + memset(&msg, 0, sizeof(msg)); + msg.mrq = MRQ_EMC_DVFS_LATENCY; + msg.tx.data = NULL; + msg.tx.size = 0; + msg.rx.data = &response; + msg.rx.size = sizeof(response); + + err = tegra_bpmp_transfer(emc->bpmp, &msg); + if (err < 0) { + dev_err(&pdev->dev, "failed to EMC DVFS pairs: %d\n", err); + return err; + } + + emc->debugfs.min_rate = ULONG_MAX; + emc->debugfs.max_rate = 0; + + emc->num_dvfs = response.num_pairs; + + emc->dvfs = devm_kmalloc_array(&pdev->dev, emc->num_dvfs, + sizeof(*emc->dvfs), GFP_KERNEL); + if (!emc->dvfs) + return -ENOMEM; + + dev_dbg(&pdev->dev, "%u DVFS pairs:\n", emc->num_dvfs); + + for (i = 0; i < emc->num_dvfs; i++) { + emc->dvfs[i].rate = response.pairs[i].freq * 1000; + emc->dvfs[i].latency = response.pairs[i].latency; + + if (emc->dvfs[i].rate < emc->debugfs.min_rate) + emc->debugfs.min_rate = emc->dvfs[i].rate; + + if (emc->dvfs[i].rate > emc->debugfs.max_rate) + emc->debugfs.max_rate = emc->dvfs[i].rate; + + dev_dbg(&pdev->dev, " %2u: %lu Hz -> %lu us\n", i, + emc->dvfs[i].rate, emc->dvfs[i].latency); + } + + err = clk_set_rate_range(emc->clk, emc->debugfs.min_rate, + emc->debugfs.max_rate); + if (err < 0) { + dev_err(&pdev->dev, + "failed to set rate range [%lu-%lu] for %pC\n", + emc->debugfs.min_rate, emc->debugfs.max_rate, + emc->clk); + return err; + } + + emc->debugfs.root = debugfs_create_dir("emc", NULL); + if (!emc->debugfs.root) { + dev_err(&pdev->dev, "failed to create debugfs directory\n"); + return 0; + } + + debugfs_create_file("available_rates", S_IRUGO, emc->debugfs.root, + emc, &tegra186_emc_debug_available_rates_fops); + debugfs_create_file("min_rate", S_IRUGO | S_IWUSR, emc->debugfs.root, + emc, &tegra186_emc_debug_min_rate_fops); + debugfs_create_file("max_rate", S_IRUGO | S_IWUSR, emc->debugfs.root, + emc, &tegra186_emc_debug_max_rate_fops); + + return 0; +} + +static int tegra186_emc_remove(struct platform_device *pdev) +{ + struct tegra186_emc *emc = platform_get_drvdata(pdev); + + debugfs_remove_recursive(emc->debugfs.root); + tegra_bpmp_put(emc->bpmp); + + return 0; +} + +static const struct of_device_id tegra186_emc_of_match[] = { +#if defined(CONFIG_ARCH_TEGRA186_SOC) + { .compatible = "nvidia,tegra186-emc" }, +#endif +#if defined(CONFIG_ARCH_TEGRA194_SOC) + { .compatible = "nvidia,tegra194-emc" }, +#endif + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, tegra186_emc_of_match); + +static struct platform_driver tegra186_emc_driver = { + .driver = { + .name = "tegra186-emc", + .of_match_table = tegra186_emc_of_match, + .suppress_bind_attrs = true, + }, + .probe = tegra186_emc_probe, + .remove = tegra186_emc_remove, +}; +module_platform_driver(tegra186_emc_driver); + +MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>"); +MODULE_DESCRIPTION("NVIDIA Tegra186 External Memory Controller driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/memory/tegra/tegra186.c b/drivers/memory/tegra/tegra186.c index 441213a35930..5d53f11ca7b6 100644 --- a/drivers/memory/tegra/tegra186.c +++ b/drivers/memory/tegra/tegra186.c @@ -6,16 +6,18 @@ #include <linux/io.h> #include <linux/module.h> #include <linux/mod_devicetable.h> +#include <linux/of_device.h> #include <linux/platform_device.h> +#if defined(CONFIG_ARCH_TEGRA_186_SOC) #include <dt-bindings/memory/tegra186-mc.h> +#endif -struct tegra_mc { - struct device *dev; - void __iomem *regs; -}; +#if defined(CONFIG_ARCH_TEGRA_194_SOC) +#include <dt-bindings/memory/tegra194-mc.h> +#endif -struct tegra_mc_client { +struct tegra186_mc_client { const char *name; unsigned int sid; struct { @@ -24,7 +26,46 @@ struct tegra_mc_client { } regs; }; -static const struct tegra_mc_client tegra186_mc_clients[] = { +struct tegra186_mc_soc { + const struct tegra186_mc_client *clients; + unsigned int num_clients; +}; + +struct tegra186_mc { + struct device *dev; + void __iomem *regs; + + const struct tegra186_mc_soc *soc; +}; + +static void tegra186_mc_program_sid(struct tegra186_mc *mc) +{ + unsigned int i; + + for (i = 0; i < mc->soc->num_clients; i++) { + const struct tegra186_mc_client *client = &mc->soc->clients[i]; + u32 override, security; + + override = readl(mc->regs + client->regs.override); + security = readl(mc->regs + client->regs.security); + + dev_dbg(mc->dev, "client %s: override: %x security: %x\n", + client->name, override, security); + + dev_dbg(mc->dev, "setting SID %u for %s\n", client->sid, + client->name); + writel(client->sid, mc->regs + client->regs.override); + + override = readl(mc->regs + client->regs.override); + security = readl(mc->regs + client->regs.security); + + dev_dbg(mc->dev, "client %s: override: %x security: %x\n", + client->name, override, security); + } +} + +#if defined(CONFIG_ARCH_TEGRA_186_SOC) +static const struct tegra186_mc_client tegra186_mc_clients[] = { { .name = "ptcr", .sid = TEGRA186_SID_PASSTHROUGH, @@ -532,17 +573,966 @@ static const struct tegra_mc_client tegra186_mc_clients[] = { }, }; +static const struct tegra186_mc_soc tegra186_mc_soc = { + .num_clients = ARRAY_SIZE(tegra186_mc_clients), + .clients = tegra186_mc_clients, +}; +#endif + +#if defined(CONFIG_ARCH_TEGRA_194_SOC) +static const struct tegra186_mc_client tegra194_mc_clients[] = { + { + .name = "ptcr", + .sid = TEGRA194_SID_PASSTHROUGH, + .regs = { + .override = 0x000, + .security = 0x004, + }, + }, { + .name = "miu7r", + .sid = TEGRA194_SID_MIU, + .regs = { + .override = 0x008, + .security = 0x00c, + }, + }, { + .name = "miu7w", + .sid = TEGRA194_SID_MIU, + .regs = { + .override = 0x010, + .security = 0x014, + }, + }, { + .name = "hdar", + .sid = TEGRA194_SID_HDA, + .regs = { + .override = 0x0a8, + .security = 0x0ac, + }, + }, { + .name = "host1xdmar", + .sid = TEGRA194_SID_HOST1X, + .regs = { + .override = 0x0b0, + .security = 0x0b4, + }, + }, { + .name = "nvencsrd", + .sid = TEGRA194_SID_NVENC, + .regs = { + .override = 0x0e0, + .security = 0x0e4, + }, + }, { + .name = "satar", + .sid = TEGRA194_SID_SATA, + .regs = { + .override = 0x0f8, + .security = 0x0fc, + }, + }, { + .name = "mpcorer", + .sid = TEGRA194_SID_PASSTHROUGH, + .regs = { + .override = 0x138, + .security = 0x13c, + }, + }, { + .name = "nvencswr", + .sid = TEGRA194_SID_NVENC, + .regs = { + .override = 0x158, + .security = 0x15c, + }, + }, { + .name = "hdaw", + .sid = TEGRA194_SID_HDA, + .regs = { + .override = 0x1a8, + .security = 0x1ac, + }, + }, { + .name = "mpcorew", + .sid = TEGRA194_SID_PASSTHROUGH, + .regs = { + .override = 0x1c8, + .security = 0x1cc, + }, + }, { + .name = "sataw", + .sid = TEGRA194_SID_SATA, + .regs = { + .override = 0x1e8, + .security = 0x1ec, + }, + }, { + .name = "ispra", + .sid = TEGRA194_SID_ISP, + .regs = { + .override = 0x220, + .security = 0x224, + }, + }, { + .name = "ispfalr", + .sid = TEGRA194_SID_ISP_FALCON, + .regs = { + .override = 0x228, + .security = 0x22c, + }, + }, { + .name = "ispwa", + .sid = TEGRA194_SID_ISP, + .regs = { + .override = 0x230, + .security = 0x234, + }, + }, { + .name = "ispwb", + .sid = TEGRA194_SID_ISP, + .regs = { + .override = 0x238, + .security = 0x23c, + }, + }, { + .name = "xusb_hostr", + .sid = TEGRA194_SID_XUSB_HOST, + .regs = { + .override = 0x250, + .security = 0x254, + }, + }, { + .name = "xusb_hostw", + .sid = TEGRA194_SID_XUSB_HOST, + .regs = { + .override = 0x258, + .security = 0x25c, + }, + }, { + .name = "xusb_devr", + .sid = TEGRA194_SID_XUSB_DEV, + .regs = { + .override = 0x260, + .security = 0x264, + }, + }, { + .name = "xusb_devw", + .sid = TEGRA194_SID_XUSB_DEV, + .regs = { + .override = 0x268, + .security = 0x26c, + }, + }, { + .name = "sdmmcra", + .sid = TEGRA194_SID_SDMMC1, + .regs = { + .override = 0x300, + .security = 0x304, + }, + }, { + .name = "sdmmcr", + .sid = TEGRA194_SID_SDMMC3, + .regs = { + .override = 0x310, + .security = 0x314, + }, + }, { + .name = "sdmmcrab", + .sid = TEGRA194_SID_SDMMC4, + .regs = { + .override = 0x318, + .security = 0x31c, + }, + }, { + .name = "sdmmcwa", + .sid = TEGRA194_SID_SDMMC1, + .regs = { + .override = 0x320, + .security = 0x324, + }, + }, { + .name = "sdmmcw", + .sid = TEGRA194_SID_SDMMC3, + .regs = { + .override = 0x330, + .security = 0x334, + }, + }, { + .name = "sdmmcwab", + .sid = TEGRA194_SID_SDMMC4, + .regs = { + .override = 0x338, + .security = 0x33c, + }, + }, { + .name = "vicsrd", + .sid = TEGRA194_SID_VIC, + .regs = { + .override = 0x360, + .security = 0x364, + }, + }, { + .name = "vicswr", + .sid = TEGRA194_SID_VIC, + .regs = { + .override = 0x368, + .security = 0x36c, + }, + }, { + .name = "viw", + .sid = TEGRA194_SID_VI, + .regs = { + .override = 0x390, + .security = 0x394, + }, + }, { + .name = "nvdecsrd", + .sid = TEGRA194_SID_NVDEC, + .regs = { + .override = 0x3c0, + .security = 0x3c4, + }, + }, { + .name = "nvdecswr", + .sid = TEGRA194_SID_NVDEC, + .regs = { + .override = 0x3c8, + .security = 0x3cc, + }, + }, { + .name = "aper", + .sid = TEGRA194_SID_APE, + .regs = { + .override = 0x3c0, + .security = 0x3c4, + }, + }, { + .name = "apew", + .sid = TEGRA194_SID_APE, + .regs = { + .override = 0x3d0, + .security = 0x3d4, + }, + }, { + .name = "nvjpgsrd", + .sid = TEGRA194_SID_NVJPG, + .regs = { + .override = 0x3f0, + .security = 0x3f4, + }, + }, { + .name = "nvjpgswr", + .sid = TEGRA194_SID_NVJPG, + .regs = { + .override = 0x3f0, + .security = 0x3f4, + }, + }, { + .name = "axiapr", + .sid = TEGRA194_SID_PASSTHROUGH, + .regs = { + .override = 0x410, + .security = 0x414, + }, + }, { + .name = "axiapw", + .sid = TEGRA194_SID_PASSTHROUGH, + .regs = { + .override = 0x418, + .security = 0x41c, + }, + }, { + .name = "etrr", + .sid = TEGRA194_SID_ETR, + .regs = { + .override = 0x420, + .security = 0x424, + }, + }, { + .name = "etrw", + .sid = TEGRA194_SID_ETR, + .regs = { + .override = 0x428, + .security = 0x42c, + }, + }, { + .name = "axisr", + .sid = TEGRA194_SID_PASSTHROUGH, + .regs = { + .override = 0x460, + .security = 0x464, + }, + }, { + .name = "axisw", + .sid = TEGRA194_SID_PASSTHROUGH, + .regs = { + .override = 0x468, + .security = 0x46c, + }, + }, { + .name = "eqosr", + .sid = TEGRA194_SID_EQOS, + .regs = { + .override = 0x470, + .security = 0x474, + }, + }, { + .name = "eqosw", + .sid = TEGRA194_SID_EQOS, + .regs = { + .override = 0x478, + .security = 0x47c, + }, + }, { + .name = "ufshcr", + .sid = TEGRA194_SID_UFSHC, + .regs = { + .override = 0x480, + .security = 0x484, + }, + }, { + .name = "ufshcw", + .sid = TEGRA194_SID_UFSHC, + .regs = { + .override = 0x488, + .security = 0x48c, + }, + }, { + .name = "nvdisplayr", + .sid = TEGRA194_SID_NVDISPLAY, + .regs = { + .override = 0x490, + .security = 0x494, + }, + }, { + .name = "bpmpr", + .sid = TEGRA194_SID_BPMP, + .regs = { + .override = 0x498, + .security = 0x49c, + }, + }, { + .name = "bpmpw", + .sid = TEGRA194_SID_BPMP, + .regs = { + .override = 0x4a0, + .security = 0x4a4, + }, + }, { + .name = "bpmpdmar", + .sid = TEGRA194_SID_BPMP, + .regs = { + .override = 0x4a8, + .security = 0x4ac, + }, + }, { + .name = "bpmpdmaw", + .sid = TEGRA194_SID_BPMP, + .regs = { + .override = 0x4b0, + .security = 0x4b4, + }, + }, { + .name = "aonr", + .sid = TEGRA194_SID_AON, + .regs = { + .override = 0x4b8, + .security = 0x4bc, + }, + }, { + .name = "aonw", + .sid = TEGRA194_SID_AON, + .regs = { + .override = 0x4c0, + .security = 0x4c4, + }, + }, { + .name = "aondmar", + .sid = TEGRA194_SID_AON, + .regs = { + .override = 0x4c8, + .security = 0x4cc, + }, + }, { + .name = "aondmaw", + .sid = TEGRA194_SID_AON, + .regs = { + .override = 0x4d0, + .security = 0x4d4, + }, + }, { + .name = "scer", + .sid = TEGRA194_SID_SCE, + .regs = { + .override = 0x4d8, + .security = 0x4dc, + }, + }, { + .name = "scew", + .sid = TEGRA194_SID_SCE, + .regs = { + .override = 0x4e0, + .security = 0x4e4, + }, + }, { + .name = "scedmar", + .sid = TEGRA194_SID_SCE, + .regs = { + .override = 0x4e8, + .security = 0x4ec, + }, + }, { + .name = "scedmaw", + .sid = TEGRA194_SID_SCE, + .regs = { + .override = 0x4f0, + .security = 0x4f4, + }, + }, { + .name = "apedmar", + .sid = TEGRA194_SID_APE, + .regs = { + .override = 0x4f8, + .security = 0x4fc, + }, + }, { + .name = "apedmaw", + .sid = TEGRA194_SID_APE, + .regs = { + .override = 0x500, + .security = 0x504, + }, + }, { + .name = "nvdisplayr1", + .sid = TEGRA194_SID_NVDISPLAY, + .regs = { + .override = 0x508, + .security = 0x50c, + }, + }, { + .name = "vicsrd1", + .sid = TEGRA194_SID_VIC, + .regs = { + .override = 0x510, + .security = 0x514, + }, + }, { + .name = "nvdecsrd1", + .sid = TEGRA194_SID_NVDEC, + .regs = { + .override = 0x518, + .security = 0x51c, + }, + }, { + .name = "miu0r", + .sid = TEGRA194_SID_MIU, + .regs = { + .override = 0x530, + .security = 0x534, + }, + }, { + .name = "miu0w", + .sid = TEGRA194_SID_MIU, + .regs = { + .override = 0x538, + .security = 0x53c, + }, + }, { + .name = "miu1r", + .sid = TEGRA194_SID_MIU, + .regs = { + .override = 0x540, + .security = 0x544, + }, + }, { + .name = "miu1w", + .sid = TEGRA194_SID_MIU, + .regs = { + .override = 0x548, + .security = 0x54c, + }, + }, { + .name = "miu2r", + .sid = TEGRA194_SID_MIU, + .regs = { + .override = 0x570, + .security = 0x574, + }, + }, { + .name = "miu2w", + .sid = TEGRA194_SID_MIU, + .regs = { + .override = 0x578, + .security = 0x57c, + }, + }, { + .name = "miu3r", + .sid = TEGRA194_SID_MIU, + .regs = { + .override = 0x580, + .security = 0x584, + }, + }, { + .name = "miu3w", + .sid = TEGRA194_SID_MIU, + .regs = { + .override = 0x588, + .security = 0x58c, + }, + }, { + .name = "miu4r", + .sid = TEGRA194_SID_MIU, + .regs = { + .override = 0x590, + .security = 0x594, + }, + }, { + .name = "miu4w", + .sid = TEGRA194_SID_MIU, + .regs = { + .override = 0x598, + .security = 0x59c, + }, + }, { + .name = "dpmur", + .sid = TEGRA194_SID_PASSTHROUGH, + .regs = { + .override = 0x598, + .security = 0x59c, + }, + }, { + .name = "vifalr", + .sid = TEGRA194_SID_VI_FALCON, + .regs = { + .override = 0x5e0, + .security = 0x5e4, + }, + }, { + .name = "vifalw", + .sid = TEGRA194_SID_VI_FALCON, + .regs = { + .override = 0x5e8, + .security = 0x5ec, + }, + }, { + .name = "dla0rda", + .sid = TEGRA194_SID_NVDLA0, + .regs = { + .override = 0x5f0, + .security = 0x5f4, + }, + }, { + .name = "dla0falrdb", + .sid = TEGRA194_SID_NVDLA0, + .regs = { + .override = 0x5f8, + .security = 0x5fc, + }, + }, { + .name = "dla0wra", + .sid = TEGRA194_SID_NVDLA0, + .regs = { + .override = 0x600, + .security = 0x604, + }, + }, { + .name = "dla0falwrb", + .sid = TEGRA194_SID_NVDLA0, + .regs = { + .override = 0x608, + .security = 0x60c, + }, + }, { + .name = "dla1rda", + .sid = TEGRA194_SID_NVDLA1, + .regs = { + .override = 0x610, + .security = 0x614, + }, + }, { + .name = "dla1falrdb", + .sid = TEGRA194_SID_NVDLA1, + .regs = { + .override = 0x618, + .security = 0x61c, + }, + }, { + .name = "dla1wra", + .sid = TEGRA194_SID_NVDLA1, + .regs = { + .override = 0x620, + .security = 0x624, + }, + }, { + .name = "dla1falwrb", + .sid = TEGRA194_SID_NVDLA1, + .regs = { + .override = 0x628, + .security = 0x62c, + }, + }, { + .name = "pva0rda", + .sid = TEGRA194_SID_PVA0, + .regs = { + .override = 0x630, + .security = 0x634, + }, + }, { + .name = "pva0rdb", + .sid = TEGRA194_SID_PVA0, + .regs = { + .override = 0x638, + .security = 0x63c, + }, + }, { + .name = "pva0rdc", + .sid = TEGRA194_SID_PVA0, + .regs = { + .override = 0x640, + .security = 0x644, + }, + }, { + .name = "pva0wra", + .sid = TEGRA194_SID_PVA0, + .regs = { + .override = 0x648, + .security = 0x64c, + }, + }, { + .name = "pva0wrb", + .sid = TEGRA194_SID_PVA0, + .regs = { + .override = 0x650, + .security = 0x654, + }, + }, { + .name = "pva0wrc", + .sid = TEGRA194_SID_PVA0, + .regs = { + .override = 0x658, + .security = 0x65c, + }, + }, { + .name = "pva1rda", + .sid = TEGRA194_SID_PVA1, + .regs = { + .override = 0x660, + .security = 0x664, + }, + }, { + .name = "pva1rdb", + .sid = TEGRA194_SID_PVA1, + .regs = { + .override = 0x668, + .security = 0x66c, + }, + }, { + .name = "pva1rdc", + .sid = TEGRA194_SID_PVA1, + .regs = { + .override = 0x670, + .security = 0x674, + }, + }, { + .name = "pva1wra", + .sid = TEGRA194_SID_PVA1, + .regs = { + .override = 0x678, + .security = 0x67c, + }, + }, { + .name = "pva1wrb", + .sid = TEGRA194_SID_PVA1, + .regs = { + .override = 0x680, + .security = 0x684, + }, + }, { + .name = "pva1wrc", + .sid = TEGRA194_SID_PVA1, + .regs = { + .override = 0x688, + .security = 0x68c, + }, + }, { + .name = "rcer", + .sid = TEGRA194_SID_RCE, + .regs = { + .override = 0x690, + .security = 0x694, + }, + }, { + .name = "rcew", + .sid = TEGRA194_SID_RCE, + .regs = { + .override = 0x698, + .security = 0x69c, + }, + }, { + .name = "rcedmar", + .sid = TEGRA194_SID_RCE, + .regs = { + .override = 0x6a0, + .security = 0x6a4, + }, + }, { + .name = "rcedmaw", + .sid = TEGRA194_SID_RCE, + .regs = { + .override = 0x6a8, + .security = 0x6ac, + }, + }, { + .name = "nvenc1srd", + .sid = TEGRA194_SID_NVENC1, + .regs = { + .override = 0x6b0, + .security = 0x6b4, + }, + }, { + .name = "nvenc1swr", + .sid = TEGRA194_SID_NVENC1, + .regs = { + .override = 0x6b8, + .security = 0x6bc, + }, + }, { + .name = "pcie0r", + .sid = TEGRA194_SID_PCIE0, + .regs = { + .override = 0x6c0, + .security = 0x6c4, + }, + }, { + .name = "pcie0w", + .sid = TEGRA194_SID_PCIE0, + .regs = { + .override = 0x6c8, + .security = 0x6cc, + }, + }, { + .name = "pcie1r", + .sid = TEGRA194_SID_PCIE1, + .regs = { + .override = 0x6d0, + .security = 0x6d4, + }, + }, { + .name = "pcie1w", + .sid = TEGRA194_SID_PCIE1, + .regs = { + .override = 0x6d8, + .security = 0x6dc, + }, + }, { + .name = "pcie2ar", + .sid = TEGRA194_SID_PCIE2, + .regs = { + .override = 0x6e0, + .security = 0x6e4, + }, + }, { + .name = "pcie2aw", + .sid = TEGRA194_SID_PCIE2, + .regs = { + .override = 0x6e8, + .security = 0x6ec, + }, + }, { + .name = "pcie3r", + .sid = TEGRA194_SID_PCIE3, + .regs = { + .override = 0x6f0, + .security = 0x6f4, + }, + }, { + .name = "pcie3w", + .sid = TEGRA194_SID_PCIE3, + .regs = { + .override = 0x6f8, + .security = 0x6fc, + }, + }, { + .name = "pcie4r", + .sid = TEGRA194_SID_PCIE4, + .regs = { + .override = 0x700, + .security = 0x704, + }, + }, { + .name = "pcie4w", + .sid = TEGRA194_SID_PCIE4, + .regs = { + .override = 0x708, + .security = 0x70c, + }, + }, { + .name = "pcie5r", + .sid = TEGRA194_SID_PCIE5, + .regs = { + .override = 0x710, + .security = 0x714, + }, + }, { + .name = "pcie5w", + .sid = TEGRA194_SID_PCIE5, + .regs = { + .override = 0x718, + .security = 0x71c, + }, + }, { + .name = "ispfalw", + .sid = TEGRA194_SID_ISP_FALCON, + .regs = { + .override = 0x720, + .security = 0x724, + }, + }, { + .name = "dla0rda1", + .sid = TEGRA194_SID_NVDLA0, + .regs = { + .override = 0x748, + .security = 0x74c, + }, + }, { + .name = "dla1rda1", + .sid = TEGRA194_SID_NVDLA1, + .regs = { + .override = 0x750, + .security = 0x754, + }, + }, { + .name = "pva0rda1", + .sid = TEGRA194_SID_PVA0, + .regs = { + .override = 0x758, + .security = 0x75c, + }, + }, { + .name = "pva0rdb1", + .sid = TEGRA194_SID_PVA0, + .regs = { + .override = 0x760, + .security = 0x764, + }, + }, { + .name = "pva1rda1", + .sid = TEGRA194_SID_PVA1, + .regs = { + .override = 0x768, + .security = 0x76c, + }, + }, { + .name = "pva1rdb1", + .sid = TEGRA194_SID_PVA1, + .regs = { + .override = 0x770, + .security = 0x774, + }, + }, { + .name = "pcie5r1", + .sid = TEGRA194_SID_PCIE5, + .regs = { + .override = 0x778, + .security = 0x77c, + }, + }, { + .name = "nvencsrd1", + .sid = TEGRA194_SID_NVENC, + .regs = { + .override = 0x780, + .security = 0x784, + }, + }, { + .name = "nvenc1srd1", + .sid = TEGRA194_SID_NVENC1, + .regs = { + .override = 0x788, + .security = 0x78c, + }, + }, { + .name = "ispra1", + .sid = TEGRA194_SID_ISP, + .regs = { + .override = 0x790, + .security = 0x794, + }, + }, { + .name = "pcie0r1", + .sid = TEGRA194_SID_PCIE0, + .regs = { + .override = 0x798, + .security = 0x79c, + }, + }, { + .name = "nvdec1srd", + .sid = TEGRA194_SID_NVDEC1, + .regs = { + .override = 0x7c8, + .security = 0x7cc, + }, + }, { + .name = "nvdec1srd1", + .sid = TEGRA194_SID_NVDEC1, + .regs = { + .override = 0x7d0, + .security = 0x7d4, + }, + }, { + .name = "nvdec1swr", + .sid = TEGRA194_SID_NVDEC1, + .regs = { + .override = 0x7d8, + .security = 0x7dc, + }, + }, { + .name = "miu5r", + .sid = TEGRA194_SID_MIU, + .regs = { + .override = 0x7e0, + .security = 0x7e4, + }, + }, { + .name = "miu5w", + .sid = TEGRA194_SID_MIU, + .regs = { + .override = 0x7e8, + .security = 0x7ec, + }, + }, { + .name = "miu6r", + .sid = TEGRA194_SID_MIU, + .regs = { + .override = 0x7f0, + .security = 0x7f4, + }, + }, { + .name = "miu6w", + .sid = TEGRA194_SID_MIU, + .regs = { + .override = 0x7f8, + .security = 0x7fc, + }, + }, +}; + +static const struct tegra186_mc_soc tegra194_mc_soc = { + .num_clients = ARRAY_SIZE(tegra194_mc_clients), + .clients = tegra194_mc_clients, +}; +#endif + static int tegra186_mc_probe(struct platform_device *pdev) { + struct tegra186_mc *mc; struct resource *res; - struct tegra_mc *mc; - unsigned int i; - int err = 0; + int err; mc = devm_kzalloc(&pdev->dev, sizeof(*mc), GFP_KERNEL); if (!mc) return -ENOMEM; + mc->soc = of_device_get_match_data(&pdev->dev); + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); mc->regs = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(mc->regs)) @@ -550,46 +1540,63 @@ static int tegra186_mc_probe(struct platform_device *pdev) mc->dev = &pdev->dev; - for (i = 0; i < ARRAY_SIZE(tegra186_mc_clients); i++) { - const struct tegra_mc_client *client = &tegra186_mc_clients[i]; - u32 override, security; - - override = readl(mc->regs + client->regs.override); - security = readl(mc->regs + client->regs.security); + err = of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev); + if (err < 0) + return err; - dev_dbg(&pdev->dev, "client %s: override: %x security: %x\n", - client->name, override, security); - - dev_dbg(&pdev->dev, "setting SID %u for %s\n", client->sid, - client->name); - writel(client->sid, mc->regs + client->regs.override); + platform_set_drvdata(pdev, mc); + tegra186_mc_program_sid(mc); - override = readl(mc->regs + client->regs.override); - security = readl(mc->regs + client->regs.security); + return 0; +} - dev_dbg(&pdev->dev, "client %s: override: %x security: %x\n", - client->name, override, security); - } +static int tegra186_mc_remove(struct platform_device *pdev) +{ + struct tegra186_mc *mc = platform_get_drvdata(pdev); - platform_set_drvdata(pdev, mc); + of_platform_depopulate(mc->dev); - return err; + return 0; } static const struct of_device_id tegra186_mc_of_match[] = { - { .compatible = "nvidia,tegra186-mc", }, +#if defined(CONFIG_ARCH_TEGRA_186_SOC) + { .compatible = "nvidia,tegra186-mc", .data = &tegra186_mc_soc }, +#endif +#if defined(CONFIG_ARCH_TEGRA_194_SOC) + { .compatible = "nvidia,tegra194-mc", .data = &tegra194_mc_soc }, +#endif { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, tegra186_mc_of_match); +static int tegra186_mc_suspend(struct device *dev) +{ + return 0; +} + +static int tegra186_mc_resume(struct device *dev) +{ + struct tegra186_mc *mc = dev_get_drvdata(dev); + + tegra186_mc_program_sid(mc); + + return 0; +} + +static const struct dev_pm_ops tegra186_mc_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(tegra186_mc_suspend, tegra186_mc_resume) +}; + static struct platform_driver tegra186_mc_driver = { .driver = { .name = "tegra186-mc", .of_match_table = tegra186_mc_of_match, + .pm = &tegra186_mc_pm_ops, .suppress_bind_attrs = true, }, - .prevent_deferred_probe = true, .probe = tegra186_mc_probe, + .remove = tegra186_mc_remove, }; module_platform_driver(tegra186_mc_driver); diff --git a/drivers/memory/tegra/tegra20-emc.c b/drivers/memory/tegra/tegra20-emc.c index 1b23b1c34476..8ae474d9bfb9 100644 --- a/drivers/memory/tegra/tegra20-emc.c +++ b/drivers/memory/tegra/tegra20-emc.c @@ -8,6 +8,7 @@ #include <linux/clk.h> #include <linux/clk/tegra.h> #include <linux/completion.h> +#include <linux/debugfs.h> #include <linux/err.h> #include <linux/interrupt.h> #include <linux/io.h> @@ -150,6 +151,12 @@ struct tegra_emc { struct emc_timing *timings; unsigned int num_timings; + + struct { + struct dentry *root; + unsigned long min_rate; + unsigned long max_rate; + } debugfs; }; static irqreturn_t tegra_emc_isr(int irq, void *data) @@ -478,6 +485,171 @@ static long emc_round_rate(unsigned long rate, return timing->rate; } +/* + * debugfs interface + * + * The memory controller driver exposes some files in debugfs that can be used + * to control the EMC frequency. The top-level directory can be found here: + * + * /sys/kernel/debug/emc + * + * It contains the following files: + * + * - available_rates: This file contains a list of valid, space-separated + * EMC frequencies. + * + * - min_rate: Writing a value to this file sets the given frequency as the + * floor of the permitted range. If this is higher than the currently + * configured EMC frequency, this will cause the frequency to be + * increased so that it stays within the valid range. + * + * - max_rate: Similarily to the min_rate file, writing a value to this file + * sets the given frequency as the ceiling of the permitted range. If + * the value is lower than the currently configured EMC frequency, this + * will cause the frequency to be decreased so that it stays within the + * valid range. + */ + +static bool tegra_emc_validate_rate(struct tegra_emc *emc, unsigned long rate) +{ + unsigned int i; + + for (i = 0; i < emc->num_timings; i++) + if (rate == emc->timings[i].rate) + return true; + + return false; +} + +static int tegra_emc_debug_available_rates_show(struct seq_file *s, void *data) +{ + struct tegra_emc *emc = s->private; + const char *prefix = ""; + unsigned int i; + + for (i = 0; i < emc->num_timings; i++) { + seq_printf(s, "%s%lu", prefix, emc->timings[i].rate); + prefix = " "; + } + + seq_puts(s, "\n"); + + return 0; +} + +static int tegra_emc_debug_available_rates_open(struct inode *inode, + struct file *file) +{ + return single_open(file, tegra_emc_debug_available_rates_show, + inode->i_private); +} + +static const struct file_operations tegra_emc_debug_available_rates_fops = { + .open = tegra_emc_debug_available_rates_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int tegra_emc_debug_min_rate_get(void *data, u64 *rate) +{ + struct tegra_emc *emc = data; + + *rate = emc->debugfs.min_rate; + + return 0; +} + +static int tegra_emc_debug_min_rate_set(void *data, u64 rate) +{ + struct tegra_emc *emc = data; + int err; + + if (!tegra_emc_validate_rate(emc, rate)) + return -EINVAL; + + err = clk_set_min_rate(emc->clk, rate); + if (err < 0) + return err; + + emc->debugfs.min_rate = rate; + + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(tegra_emc_debug_min_rate_fops, + tegra_emc_debug_min_rate_get, + tegra_emc_debug_min_rate_set, "%llu\n"); + +static int tegra_emc_debug_max_rate_get(void *data, u64 *rate) +{ + struct tegra_emc *emc = data; + + *rate = emc->debugfs.max_rate; + + return 0; +} + +static int tegra_emc_debug_max_rate_set(void *data, u64 rate) +{ + struct tegra_emc *emc = data; + int err; + + if (!tegra_emc_validate_rate(emc, rate)) + return -EINVAL; + + err = clk_set_max_rate(emc->clk, rate); + if (err < 0) + return err; + + emc->debugfs.max_rate = rate; + + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(tegra_emc_debug_max_rate_fops, + tegra_emc_debug_max_rate_get, + tegra_emc_debug_max_rate_set, "%llu\n"); + +static void tegra_emc_debugfs_init(struct tegra_emc *emc) +{ + struct device *dev = emc->dev; + unsigned int i; + int err; + + emc->debugfs.min_rate = ULONG_MAX; + emc->debugfs.max_rate = 0; + + for (i = 0; i < emc->num_timings; i++) { + if (emc->timings[i].rate < emc->debugfs.min_rate) + emc->debugfs.min_rate = emc->timings[i].rate; + + if (emc->timings[i].rate > emc->debugfs.max_rate) + emc->debugfs.max_rate = emc->timings[i].rate; + } + + err = clk_set_rate_range(emc->clk, emc->debugfs.min_rate, + emc->debugfs.max_rate); + if (err < 0) { + dev_err(dev, "failed to set rate range [%lu-%lu] for %pC\n", + emc->debugfs.min_rate, emc->debugfs.max_rate, + emc->clk); + } + + emc->debugfs.root = debugfs_create_dir("emc", NULL); + if (!emc->debugfs.root) { + dev_err(emc->dev, "failed to create debugfs directory\n"); + return; + } + + debugfs_create_file("available_rates", S_IRUGO, emc->debugfs.root, + emc, &tegra_emc_debug_available_rates_fops); + debugfs_create_file("min_rate", S_IRUGO | S_IWUSR, emc->debugfs.root, + emc, &tegra_emc_debug_min_rate_fops); + debugfs_create_file("max_rate", S_IRUGO | S_IWUSR, emc->debugfs.root, + emc, &tegra_emc_debug_max_rate_fops); +} + static int tegra_emc_probe(struct platform_device *pdev) { struct device_node *np; @@ -550,6 +722,9 @@ static int tegra_emc_probe(struct platform_device *pdev) goto unset_cb; } + platform_set_drvdata(pdev, emc); + tegra_emc_debugfs_init(emc); + return 0; unset_cb: diff --git a/drivers/memory/tegra/tegra210.c b/drivers/memory/tegra/tegra210.c index b420268173fc..cc0482434c75 100644 --- a/drivers/memory/tegra/tegra210.c +++ b/drivers/memory/tegra/tegra210.c @@ -436,7 +436,7 @@ static const struct tegra_mc_client tegra210_mc_clients[] = { .reg = 0x37c, .shift = 0, .mask = 0xff, - .def = 0x39, + .def = 0x7a, }, }, { .id = 0x4b, diff --git a/drivers/memory/tegra/tegra30-emc.c b/drivers/memory/tegra/tegra30-emc.c index 0b6a5e451ea3..e3efd9529506 100644 --- a/drivers/memory/tegra/tegra30-emc.c +++ b/drivers/memory/tegra/tegra30-emc.c @@ -12,6 +12,7 @@ #include <linux/clk.h> #include <linux/clk/tegra.h> #include <linux/completion.h> +#include <linux/debugfs.h> #include <linux/delay.h> #include <linux/err.h> #include <linux/interrupt.h> @@ -331,7 +332,9 @@ struct tegra_emc { struct clk *clk; void __iomem *regs; unsigned int irq; + bool bad_state; + struct emc_timing *new_timing; struct emc_timing *timings; unsigned int num_timings; @@ -345,10 +348,74 @@ struct tegra_emc { bool vref_cal_toggle : 1; bool zcal_long : 1; bool dll_on : 1; - bool prepared : 1; - bool bad_state : 1; + + struct { + struct dentry *root; + unsigned long min_rate; + unsigned long max_rate; + } debugfs; }; +static int emc_seq_update_timing(struct tegra_emc *emc) +{ + u32 val; + int err; + + writel_relaxed(EMC_TIMING_UPDATE, emc->regs + EMC_TIMING_CONTROL); + + err = readl_relaxed_poll_timeout_atomic(emc->regs + EMC_STATUS, val, + !(val & EMC_STATUS_TIMING_UPDATE_STALLED), + 1, 200); + if (err) { + dev_err(emc->dev, "failed to update timing: %d\n", err); + return err; + } + + return 0; +} + +static void emc_complete_clk_change(struct tegra_emc *emc) +{ + struct emc_timing *timing = emc->new_timing; + unsigned int dram_num; + bool failed = false; + int err; + + /* re-enable auto-refresh */ + dram_num = tegra_mc_get_emem_device_count(emc->mc); + writel_relaxed(EMC_REFCTRL_ENABLE_ALL(dram_num), + emc->regs + EMC_REFCTRL); + + /* restore auto-calibration */ + if (emc->vref_cal_toggle) + writel_relaxed(timing->emc_auto_cal_interval, + emc->regs + EMC_AUTO_CAL_INTERVAL); + + /* restore dynamic self-refresh */ + if (timing->emc_cfg_dyn_self_ref) { + emc->emc_cfg |= EMC_CFG_DYN_SREF_ENABLE; + writel_relaxed(emc->emc_cfg, emc->regs + EMC_CFG); + } + + /* set number of clocks to wait after each ZQ command */ + if (emc->zcal_long) + writel_relaxed(timing->emc_zcal_cnt_long, + emc->regs + EMC_ZCAL_WAIT_CNT); + + /* wait for writes to settle */ + udelay(2); + + /* update restored timing */ + err = emc_seq_update_timing(emc); + if (err) + failed = true; + + /* restore early ACK */ + mc_writel(emc->mc, emc->mc_override, MC_EMEM_ARB_OVERRIDE); + + WRITE_ONCE(emc->bad_state, failed); +} + static irqreturn_t tegra_emc_isr(int irq, void *data) { struct tegra_emc *emc = data; @@ -359,10 +426,6 @@ static irqreturn_t tegra_emc_isr(int irq, void *data) if (!status) return IRQ_NONE; - /* notify about EMC-CAR handshake completion */ - if (status & EMC_CLKCHANGE_COMPLETE_INT) - complete(&emc->clk_handshake_complete); - /* notify about HW problem */ if (status & EMC_REFRESH_OVERFLOW_INT) dev_err_ratelimited(emc->dev, @@ -371,6 +434,18 @@ static irqreturn_t tegra_emc_isr(int irq, void *data) /* clear interrupts */ writel_relaxed(status, emc->regs + EMC_INTSTATUS); + /* notify about EMC-CAR handshake completion */ + if (status & EMC_CLKCHANGE_COMPLETE_INT) { + if (completion_done(&emc->clk_handshake_complete)) { + dev_err_ratelimited(emc->dev, + "bogus handshake interrupt\n"); + return IRQ_NONE; + } + + emc_complete_clk_change(emc); + complete(&emc->clk_handshake_complete); + } + return IRQ_HANDLED; } @@ -438,24 +513,6 @@ static bool emc_dqs_preset(struct tegra_emc *emc, struct emc_timing *timing, return preset; } -static int emc_seq_update_timing(struct tegra_emc *emc) -{ - u32 val; - int err; - - writel_relaxed(EMC_TIMING_UPDATE, emc->regs + EMC_TIMING_CONTROL); - - err = readl_relaxed_poll_timeout_atomic(emc->regs + EMC_STATUS, val, - !(val & EMC_STATUS_TIMING_UPDATE_STALLED), - 1, 200); - if (err) { - dev_err(emc->dev, "failed to update timing: %d\n", err); - return err; - } - - return 0; -} - static int emc_prepare_mc_clk_cfg(struct tegra_emc *emc, unsigned long rate) { struct tegra_mc *mc = emc->mc; @@ -582,8 +639,7 @@ static int emc_prepare_timing_change(struct tegra_emc *emc, unsigned long rate) !(val & EMC_AUTO_CAL_STATUS_ACTIVE), 1, 300); if (err) { dev_err(emc->dev, - "failed to disable auto-cal: %d\n", - err); + "auto-cal finish timeout: %d\n", err); return err; } @@ -621,9 +677,6 @@ static int emc_prepare_timing_change(struct tegra_emc *emc, unsigned long rate) writel_relaxed(val, emc->regs + EMC_MRS_WAIT_CNT); } - /* disable interrupt since read access is prohibited after stalling */ - disable_irq(emc->irq); - /* this read also completes the writes */ val = readl_relaxed(emc->regs + EMC_SEL_DPD_CTRL); @@ -739,20 +792,18 @@ static int emc_prepare_timing_change(struct tegra_emc *emc, unsigned long rate) emc->regs + EMC_ZQ_CAL); } - /* re-enable auto-refresh */ - writel_relaxed(EMC_REFCTRL_ENABLE_ALL(dram_num), - emc->regs + EMC_REFCTRL); - /* flow control marker 3 */ writel_relaxed(0x1, emc->regs + EMC_UNSTALL_RW_AFTER_CLKCHANGE); - reinit_completion(&emc->clk_handshake_complete); + /* + * Read and discard an arbitrary MC register (Note: EMC registers + * can't be used) to ensure the register writes are completed. + */ + mc_readl(emc->mc, MC_EMEM_ARB_OVERRIDE); - /* interrupt can be re-enabled now */ - enable_irq(emc->irq); + reinit_completion(&emc->clk_handshake_complete); - emc->bad_state = false; - emc->prepared = true; + emc->new_timing = timing; return 0; } @@ -760,52 +811,25 @@ static int emc_prepare_timing_change(struct tegra_emc *emc, unsigned long rate) static int emc_complete_timing_change(struct tegra_emc *emc, unsigned long rate) { - struct emc_timing *timing = emc_find_timing(emc, rate); unsigned long timeout; - int ret; timeout = wait_for_completion_timeout(&emc->clk_handshake_complete, msecs_to_jiffies(100)); if (timeout == 0) { dev_err(emc->dev, "emc-car handshake failed\n"); - emc->bad_state = true; return -EIO; } - /* restore auto-calibration */ - if (emc->vref_cal_toggle) - writel_relaxed(timing->emc_auto_cal_interval, - emc->regs + EMC_AUTO_CAL_INTERVAL); - - /* restore dynamic self-refresh */ - if (timing->emc_cfg_dyn_self_ref) { - emc->emc_cfg |= EMC_CFG_DYN_SREF_ENABLE; - writel_relaxed(emc->emc_cfg, emc->regs + EMC_CFG); - } - - /* set number of clocks to wait after each ZQ command */ - if (emc->zcal_long) - writel_relaxed(timing->emc_zcal_cnt_long, - emc->regs + EMC_ZCAL_WAIT_CNT); - - udelay(2); - /* update restored timing */ - ret = emc_seq_update_timing(emc); - if (ret) - emc->bad_state = true; - - /* restore early ACK */ - mc_writel(emc->mc, emc->mc_override, MC_EMEM_ARB_OVERRIDE); - - emc->prepared = false; + if (READ_ONCE(emc->bad_state)) + return -EIO; - return ret; + return 0; } static int emc_unprepare_timing_change(struct tegra_emc *emc, unsigned long rate) { - if (emc->prepared && !emc->bad_state) { + if (!emc->bad_state) { /* shouldn't ever happen in practice */ dev_err(emc->dev, "timing configuration can't be reverted\n"); emc->bad_state = true; @@ -823,7 +847,13 @@ static int emc_clk_change_notify(struct notifier_block *nb, switch (msg) { case PRE_RATE_CHANGE: + /* + * Disable interrupt since read accesses are prohibited after + * stalling. + */ + disable_irq(emc->irq); err = emc_prepare_timing_change(emc, cnd->new_rate); + enable_irq(emc->irq); break; case ABORT_RATE_CHANGE: @@ -1083,6 +1113,171 @@ static long emc_round_rate(unsigned long rate, return timing->rate; } +/* + * debugfs interface + * + * The memory controller driver exposes some files in debugfs that can be used + * to control the EMC frequency. The top-level directory can be found here: + * + * /sys/kernel/debug/emc + * + * It contains the following files: + * + * - available_rates: This file contains a list of valid, space-separated + * EMC frequencies. + * + * - min_rate: Writing a value to this file sets the given frequency as the + * floor of the permitted range. If this is higher than the currently + * configured EMC frequency, this will cause the frequency to be + * increased so that it stays within the valid range. + * + * - max_rate: Similarily to the min_rate file, writing a value to this file + * sets the given frequency as the ceiling of the permitted range. If + * the value is lower than the currently configured EMC frequency, this + * will cause the frequency to be decreased so that it stays within the + * valid range. + */ + +static bool tegra_emc_validate_rate(struct tegra_emc *emc, unsigned long rate) +{ + unsigned int i; + + for (i = 0; i < emc->num_timings; i++) + if (rate == emc->timings[i].rate) + return true; + + return false; +} + +static int tegra_emc_debug_available_rates_show(struct seq_file *s, void *data) +{ + struct tegra_emc *emc = s->private; + const char *prefix = ""; + unsigned int i; + + for (i = 0; i < emc->num_timings; i++) { + seq_printf(s, "%s%lu", prefix, emc->timings[i].rate); + prefix = " "; + } + + seq_puts(s, "\n"); + + return 0; +} + +static int tegra_emc_debug_available_rates_open(struct inode *inode, + struct file *file) +{ + return single_open(file, tegra_emc_debug_available_rates_show, + inode->i_private); +} + +static const struct file_operations tegra_emc_debug_available_rates_fops = { + .open = tegra_emc_debug_available_rates_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int tegra_emc_debug_min_rate_get(void *data, u64 *rate) +{ + struct tegra_emc *emc = data; + + *rate = emc->debugfs.min_rate; + + return 0; +} + +static int tegra_emc_debug_min_rate_set(void *data, u64 rate) +{ + struct tegra_emc *emc = data; + int err; + + if (!tegra_emc_validate_rate(emc, rate)) + return -EINVAL; + + err = clk_set_min_rate(emc->clk, rate); + if (err < 0) + return err; + + emc->debugfs.min_rate = rate; + + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(tegra_emc_debug_min_rate_fops, + tegra_emc_debug_min_rate_get, + tegra_emc_debug_min_rate_set, "%llu\n"); + +static int tegra_emc_debug_max_rate_get(void *data, u64 *rate) +{ + struct tegra_emc *emc = data; + + *rate = emc->debugfs.max_rate; + + return 0; +} + +static int tegra_emc_debug_max_rate_set(void *data, u64 rate) +{ + struct tegra_emc *emc = data; + int err; + + if (!tegra_emc_validate_rate(emc, rate)) + return -EINVAL; + + err = clk_set_max_rate(emc->clk, rate); + if (err < 0) + return err; + + emc->debugfs.max_rate = rate; + + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(tegra_emc_debug_max_rate_fops, + tegra_emc_debug_max_rate_get, + tegra_emc_debug_max_rate_set, "%llu\n"); + +static void tegra_emc_debugfs_init(struct tegra_emc *emc) +{ + struct device *dev = emc->dev; + unsigned int i; + int err; + + emc->debugfs.min_rate = ULONG_MAX; + emc->debugfs.max_rate = 0; + + for (i = 0; i < emc->num_timings; i++) { + if (emc->timings[i].rate < emc->debugfs.min_rate) + emc->debugfs.min_rate = emc->timings[i].rate; + + if (emc->timings[i].rate > emc->debugfs.max_rate) + emc->debugfs.max_rate = emc->timings[i].rate; + } + + err = clk_set_rate_range(emc->clk, emc->debugfs.min_rate, + emc->debugfs.max_rate); + if (err < 0) { + dev_err(dev, "failed to set rate range [%lu-%lu] for %pC\n", + emc->debugfs.min_rate, emc->debugfs.max_rate, + emc->clk); + } + + emc->debugfs.root = debugfs_create_dir("emc", NULL); + if (!emc->debugfs.root) { + dev_err(emc->dev, "failed to create debugfs directory\n"); + return; + } + + debugfs_create_file("available_rates", S_IRUGO, emc->debugfs.root, + emc, &tegra_emc_debug_available_rates_fops); + debugfs_create_file("min_rate", S_IRUGO | S_IWUSR, emc->debugfs.root, + emc, &tegra_emc_debug_min_rate_fops); + debugfs_create_file("max_rate", S_IRUGO | S_IWUSR, emc->debugfs.root, + emc, &tegra_emc_debug_max_rate_fops); +} + static int tegra_emc_probe(struct platform_device *pdev) { struct platform_device *mc; @@ -1169,6 +1364,7 @@ static int tegra_emc_probe(struct platform_device *pdev) } platform_set_drvdata(pdev, emc); + tegra_emc_debugfs_init(emc); return 0; @@ -1181,13 +1377,17 @@ unset_cb: static int tegra_emc_suspend(struct device *dev) { struct tegra_emc *emc = dev_get_drvdata(dev); + int err; - /* - * Suspending in a bad state will hang machine. The "prepared" var - * shall be always false here unless it's a kernel bug that caused - * suspending in a wrong order. - */ - if (WARN_ON(emc->prepared) || emc->bad_state) + /* take exclusive control over the clock's rate */ + err = clk_rate_exclusive_get(emc->clk); + if (err) { + dev_err(emc->dev, "failed to acquire clk: %d\n", err); + return err; + } + + /* suspending in a bad state will hang machine */ + if (WARN(emc->bad_state, "hardware in a bad state\n")) return -EINVAL; emc->bad_state = true; @@ -1202,6 +1402,8 @@ static int tegra_emc_resume(struct device *dev) emc_setup_hw(emc); emc->bad_state = false; + clk_rate_exclusive_put(emc->clk); + return 0; } |