| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright (c) 2015-2016, The Linux Foundation. All rights reserved. |
| * |
| * Description: CoreSight System Trace Macrocell driver |
| * |
| * Initial implementation by Pratik Patel |
| * (C) 2014-2015 Pratik Patel <pratikp@codeaurora.org> |
| * |
| * Serious refactoring, code cleanup and upgrading to the Coresight upstream |
| * framework by Mathieu Poirier |
| * (C) 2015-2016 Mathieu Poirier <mathieu.poirier@linaro.org> |
| * |
| * Guaranteed timing and support for various packet type coming from the |
| * generic STM API by Chunyan Zhang |
| * (C) 2015-2016 Chunyan Zhang <zhang.chunyan@linaro.org> |
| */ |
| #include <asm/local.h> |
| #include <linux/amba/bus.h> |
| #include <linux/bitmap.h> |
| #include <linux/clk.h> |
| #include <linux/coresight.h> |
| #include <linux/coresight-stm.h> |
| #include <linux/err.h> |
| #include <linux/kernel.h> |
| #include <linux/moduleparam.h> |
| #include <linux/of_address.h> |
| #include <linux/perf_event.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/stm.h> |
| |
| #include "coresight-priv.h" |
| |
| #define STMDMASTARTR 0xc04 |
| #define STMDMASTOPR 0xc08 |
| #define STMDMASTATR 0xc0c |
| #define STMDMACTLR 0xc10 |
| #define STMDMAIDR 0xcfc |
| #define STMHEER 0xd00 |
| #define STMHETER 0xd20 |
| #define STMHEBSR 0xd60 |
| #define STMHEMCR 0xd64 |
| #define STMHEMASTR 0xdf4 |
| #define STMHEFEAT1R 0xdf8 |
| #define STMHEIDR 0xdfc |
| #define STMSPER 0xe00 |
| #define STMSPTER 0xe20 |
| #define STMPRIVMASKR 0xe40 |
| #define STMSPSCR 0xe60 |
| #define STMSPMSCR 0xe64 |
| #define STMSPOVERRIDER 0xe68 |
| #define STMSPMOVERRIDER 0xe6c |
| #define STMSPTRIGCSR 0xe70 |
| #define STMTCSR 0xe80 |
| #define STMTSSTIMR 0xe84 |
| #define STMTSFREQR 0xe8c |
| #define STMSYNCR 0xe90 |
| #define STMAUXCR 0xe94 |
| #define STMSPFEAT1R 0xea0 |
| #define STMSPFEAT2R 0xea4 |
| #define STMSPFEAT3R 0xea8 |
| #define STMITTRIGGER 0xee8 |
| #define STMITATBDATA0 0xeec |
| #define STMITATBCTR2 0xef0 |
| #define STMITATBID 0xef4 |
| #define STMITATBCTR0 0xef8 |
| |
| #define STM_32_CHANNEL 32 |
| #define BYTES_PER_CHANNEL 256 |
| #define STM_TRACE_BUF_SIZE 4096 |
| #define STM_SW_MASTER_END 127 |
| |
| /* Register bit definition */ |
| #define STMTCSR_BUSY_BIT 23 |
| /* Reserve the first 10 channels for kernel usage */ |
| #define STM_CHANNEL_OFFSET 0 |
| |
| enum stm_pkt_type { |
| STM_PKT_TYPE_DATA = 0x98, |
| STM_PKT_TYPE_FLAG = 0xE8, |
| STM_PKT_TYPE_TRIG = 0xF8, |
| }; |
| |
| #define stm_channel_addr(drvdata, ch) (drvdata->chs.base + \ |
| (ch * BYTES_PER_CHANNEL)) |
| #define stm_channel_off(type, opts) (type & ~opts) |
| |
| static int boot_nr_channel; |
| |
| /* |
| * Not really modular but using module_param is the easiest way to |
| * remain consistent with existing use cases for now. |
| */ |
| module_param_named( |
| boot_nr_channel, boot_nr_channel, int, S_IRUGO |
| ); |
| |
| /** |
| * struct channel_space - central management entity for extended ports |
| * @base: memory mapped base address where channels start. |
| * @phys: physical base address of channel region. |
| * @guaraneed: is the channel delivery guaranteed. |
| */ |
| struct channel_space { |
| void __iomem *base; |
| phys_addr_t phys; |
| unsigned long *guaranteed; |
| }; |
| |
| /** |
| * struct stm_drvdata - specifics associated to an STM component |
| * @base: memory mapped base address for this component. |
| * @dev: the device entity associated to this component. |
| * @atclk: optional clock for the core parts of the STM. |
| * @csdev: component vitals needed by the framework. |
| * @spinlock: only one at a time pls. |
| * @chs: the channels accociated to this STM. |
| * @stm: structure associated to the generic STM interface. |
| * @mode: this tracer's mode, i.e sysFS, or disabled. |
| * @traceid: value of the current ID for this component. |
| * @write_bytes: Maximus bytes this STM can write at a time. |
| * @stmsper: settings for register STMSPER. |
| * @stmspscr: settings for register STMSPSCR. |
| * @numsp: the total number of stimulus port support by this STM. |
| * @stmheer: settings for register STMHEER. |
| * @stmheter: settings for register STMHETER. |
| * @stmhebsr: settings for register STMHEBSR. |
| */ |
| struct stm_drvdata { |
| void __iomem *base; |
| struct device *dev; |
| struct clk *atclk; |
| struct coresight_device *csdev; |
| spinlock_t spinlock; |
| struct channel_space chs; |
| struct stm_data stm; |
| local_t mode; |
| u8 traceid; |
| u32 write_bytes; |
| u32 stmsper; |
| u32 stmspscr; |
| u32 numsp; |
| u32 stmheer; |
| u32 stmheter; |
| u32 stmhebsr; |
| }; |
| |
| static void stm_hwevent_enable_hw(struct stm_drvdata *drvdata) |
| { |
| CS_UNLOCK(drvdata->base); |
| |
| writel_relaxed(drvdata->stmhebsr, drvdata->base + STMHEBSR); |
| writel_relaxed(drvdata->stmheter, drvdata->base + STMHETER); |
| writel_relaxed(drvdata->stmheer, drvdata->base + STMHEER); |
| writel_relaxed(0x01 | /* Enable HW event tracing */ |
| 0x04, /* Error detection on event tracing */ |
| drvdata->base + STMHEMCR); |
| |
| CS_LOCK(drvdata->base); |
| } |
| |
| static void stm_port_enable_hw(struct stm_drvdata *drvdata) |
| { |
| CS_UNLOCK(drvdata->base); |
| /* ATB trigger enable on direct writes to TRIG locations */ |
| writel_relaxed(0x10, |
| drvdata->base + STMSPTRIGCSR); |
| writel_relaxed(drvdata->stmspscr, drvdata->base + STMSPSCR); |
| writel_relaxed(drvdata->stmsper, drvdata->base + STMSPER); |
| |
| CS_LOCK(drvdata->base); |
| } |
| |
| static void stm_enable_hw(struct stm_drvdata *drvdata) |
| { |
| if (drvdata->stmheer) |
| stm_hwevent_enable_hw(drvdata); |
| |
| stm_port_enable_hw(drvdata); |
| |
| CS_UNLOCK(drvdata->base); |
| |
| /* 4096 byte between synchronisation packets */ |
| writel_relaxed(0xFFF, drvdata->base + STMSYNCR); |
| writel_relaxed((drvdata->traceid << 16 | /* trace id */ |
| 0x02 | /* timestamp enable */ |
| 0x01), /* global STM enable */ |
| drvdata->base + STMTCSR); |
| |
| CS_LOCK(drvdata->base); |
| } |
| |
| static int stm_enable(struct coresight_device *csdev, |
| struct perf_event *event, u32 mode) |
| { |
| u32 val; |
| struct stm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
| |
| if (mode != CS_MODE_SYSFS) |
| return -EINVAL; |
| |
| val = local_cmpxchg(&drvdata->mode, CS_MODE_DISABLED, mode); |
| |
| /* Someone is already using the tracer */ |
| if (val) |
| return -EBUSY; |
| |
| pm_runtime_get_sync(drvdata->dev); |
| |
| spin_lock(&drvdata->spinlock); |
| stm_enable_hw(drvdata); |
| spin_unlock(&drvdata->spinlock); |
| |
| dev_dbg(drvdata->dev, "STM tracing enabled\n"); |
| return 0; |
| } |
| |
| static void stm_hwevent_disable_hw(struct stm_drvdata *drvdata) |
| { |
| CS_UNLOCK(drvdata->base); |
| |
| writel_relaxed(0x0, drvdata->base + STMHEMCR); |
| writel_relaxed(0x0, drvdata->base + STMHEER); |
| writel_relaxed(0x0, drvdata->base + STMHETER); |
| |
| CS_LOCK(drvdata->base); |
| } |
| |
| static void stm_port_disable_hw(struct stm_drvdata *drvdata) |
| { |
| CS_UNLOCK(drvdata->base); |
| |
| writel_relaxed(0x0, drvdata->base + STMSPER); |
| writel_relaxed(0x0, drvdata->base + STMSPTRIGCSR); |
| |
| CS_LOCK(drvdata->base); |
| } |
| |
| static void stm_disable_hw(struct stm_drvdata *drvdata) |
| { |
| u32 val; |
| |
| CS_UNLOCK(drvdata->base); |
| |
| val = readl_relaxed(drvdata->base + STMTCSR); |
| val &= ~0x1; /* clear global STM enable [0] */ |
| writel_relaxed(val, drvdata->base + STMTCSR); |
| |
| CS_LOCK(drvdata->base); |
| |
| stm_port_disable_hw(drvdata); |
| if (drvdata->stmheer) |
| stm_hwevent_disable_hw(drvdata); |
| } |
| |
| static void stm_disable(struct coresight_device *csdev, |
| struct perf_event *event) |
| { |
| struct stm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
| |
| /* |
| * For as long as the tracer isn't disabled another entity can't |
| * change its status. As such we can read the status here without |
| * fearing it will change under us. |
| */ |
| if (local_read(&drvdata->mode) == CS_MODE_SYSFS) { |
| spin_lock(&drvdata->spinlock); |
| stm_disable_hw(drvdata); |
| spin_unlock(&drvdata->spinlock); |
| |
| /* Wait until the engine has completely stopped */ |
| coresight_timeout(drvdata->base, STMTCSR, STMTCSR_BUSY_BIT, 0); |
| |
| pm_runtime_put(drvdata->dev); |
| |
| local_set(&drvdata->mode, CS_MODE_DISABLED); |
| dev_dbg(drvdata->dev, "STM tracing disabled\n"); |
| } |
| } |
| |
| static int stm_trace_id(struct coresight_device *csdev) |
| { |
| struct stm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
| |
| return drvdata->traceid; |
| } |
| |
| static const struct coresight_ops_source stm_source_ops = { |
| .trace_id = stm_trace_id, |
| .enable = stm_enable, |
| .disable = stm_disable, |
| }; |
| |
| static const struct coresight_ops stm_cs_ops = { |
| .source_ops = &stm_source_ops, |
| }; |
| |
| static inline bool stm_addr_unaligned(const void *addr, u8 write_bytes) |
| { |
| return ((unsigned long)addr & (write_bytes - 1)); |
| } |
| |
| static void stm_send(void __iomem *addr, const void *data, |
| u32 size, u8 write_bytes) |
| { |
| u8 paload[8]; |
| |
| if (stm_addr_unaligned(data, write_bytes)) { |
| memcpy(paload, data, size); |
| data = paload; |
| } |
| |
| /* now we are 64bit/32bit aligned */ |
| switch (size) { |
| #ifdef CONFIG_64BIT |
| case 8: |
| writeq_relaxed(*(u64 *)data, addr); |
| break; |
| #endif |
| case 4: |
| writel_relaxed(*(u32 *)data, addr); |
| break; |
| case 2: |
| writew_relaxed(*(u16 *)data, addr); |
| break; |
| case 1: |
| writeb_relaxed(*(u8 *)data, addr); |
| break; |
| default: |
| break; |
| } |
| } |
| |
| static int stm_generic_link(struct stm_data *stm_data, |
| unsigned int master, unsigned int channel) |
| { |
| struct stm_drvdata *drvdata = container_of(stm_data, |
| struct stm_drvdata, stm); |
| if (!drvdata || !drvdata->csdev) |
| return -EINVAL; |
| |
| return coresight_enable(drvdata->csdev); |
| } |
| |
| static void stm_generic_unlink(struct stm_data *stm_data, |
| unsigned int master, unsigned int channel) |
| { |
| struct stm_drvdata *drvdata = container_of(stm_data, |
| struct stm_drvdata, stm); |
| if (!drvdata || !drvdata->csdev) |
| return; |
| |
| coresight_disable(drvdata->csdev); |
| } |
| |
| static phys_addr_t |
| stm_mmio_addr(struct stm_data *stm_data, unsigned int master, |
| unsigned int channel, unsigned int nr_chans) |
| { |
| struct stm_drvdata *drvdata = container_of(stm_data, |
| struct stm_drvdata, stm); |
| phys_addr_t addr; |
| |
| addr = drvdata->chs.phys + channel * BYTES_PER_CHANNEL; |
| |
| if (offset_in_page(addr) || |
| offset_in_page(nr_chans * BYTES_PER_CHANNEL)) |
| return 0; |
| |
| return addr; |
| } |
| |
| static long stm_generic_set_options(struct stm_data *stm_data, |
| unsigned int master, |
| unsigned int channel, |
| unsigned int nr_chans, |
| unsigned long options) |
| { |
| struct stm_drvdata *drvdata = container_of(stm_data, |
| struct stm_drvdata, stm); |
| if (!(drvdata && local_read(&drvdata->mode))) |
| return -EINVAL; |
| |
| if (channel >= drvdata->numsp) |
| return -EINVAL; |
| |
| switch (options) { |
| case STM_OPTION_GUARANTEED: |
| set_bit(channel, drvdata->chs.guaranteed); |
| break; |
| |
| case STM_OPTION_INVARIANT: |
| clear_bit(channel, drvdata->chs.guaranteed); |
| break; |
| |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static ssize_t notrace stm_generic_packet(struct stm_data *stm_data, |
| unsigned int master, |
| unsigned int channel, |
| unsigned int packet, |
| unsigned int flags, |
| unsigned int size, |
| const unsigned char *payload) |
| { |
| void __iomem *ch_addr; |
| struct stm_drvdata *drvdata = container_of(stm_data, |
| struct stm_drvdata, stm); |
| |
| if (!(drvdata && local_read(&drvdata->mode))) |
| return -EACCES; |
| |
| if (channel >= drvdata->numsp) |
| return -EINVAL; |
| |
| ch_addr = stm_channel_addr(drvdata, channel); |
| |
| flags = (flags == STP_PACKET_TIMESTAMPED) ? STM_FLAG_TIMESTAMPED : 0; |
| flags |= test_bit(channel, drvdata->chs.guaranteed) ? |
| STM_FLAG_GUARANTEED : 0; |
| |
| if (size > drvdata->write_bytes) |
| size = drvdata->write_bytes; |
| else |
| size = rounddown_pow_of_two(size); |
| |
| switch (packet) { |
| case STP_PACKET_FLAG: |
| ch_addr += stm_channel_off(STM_PKT_TYPE_FLAG, flags); |
| |
| /* |
| * The generic STM core sets a size of '0' on flag packets. |
| * As such send a flag packet of size '1' and tell the |
| * core we did so. |
| */ |
| stm_send(ch_addr, payload, 1, drvdata->write_bytes); |
| size = 1; |
| break; |
| |
| case STP_PACKET_DATA: |
| ch_addr += stm_channel_off(STM_PKT_TYPE_DATA, flags); |
| stm_send(ch_addr, payload, size, |
| drvdata->write_bytes); |
| break; |
| |
| default: |
| return -ENOTSUPP; |
| } |
| |
| return size; |
| } |
| |
| static ssize_t hwevent_enable_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct stm_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| unsigned long val = drvdata->stmheer; |
| |
| return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); |
| } |
| |
| static ssize_t hwevent_enable_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t size) |
| { |
| struct stm_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| unsigned long val; |
| int ret = 0; |
| |
| ret = kstrtoul(buf, 16, &val); |
| if (ret) |
| return -EINVAL; |
| |
| drvdata->stmheer = val; |
| /* HW event enable and trigger go hand in hand */ |
| drvdata->stmheter = val; |
| |
| return size; |
| } |
| static DEVICE_ATTR_RW(hwevent_enable); |
| |
| static ssize_t hwevent_select_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct stm_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| unsigned long val = drvdata->stmhebsr; |
| |
| return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); |
| } |
| |
| static ssize_t hwevent_select_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t size) |
| { |
| struct stm_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| unsigned long val; |
| int ret = 0; |
| |
| ret = kstrtoul(buf, 16, &val); |
| if (ret) |
| return -EINVAL; |
| |
| drvdata->stmhebsr = val; |
| |
| return size; |
| } |
| static DEVICE_ATTR_RW(hwevent_select); |
| |
| static ssize_t port_select_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct stm_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| unsigned long val; |
| |
| if (!local_read(&drvdata->mode)) { |
| val = drvdata->stmspscr; |
| } else { |
| spin_lock(&drvdata->spinlock); |
| val = readl_relaxed(drvdata->base + STMSPSCR); |
| spin_unlock(&drvdata->spinlock); |
| } |
| |
| return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); |
| } |
| |
| static ssize_t port_select_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t size) |
| { |
| struct stm_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| unsigned long val, stmsper; |
| int ret = 0; |
| |
| ret = kstrtoul(buf, 16, &val); |
| if (ret) |
| return ret; |
| |
| spin_lock(&drvdata->spinlock); |
| drvdata->stmspscr = val; |
| |
| if (local_read(&drvdata->mode)) { |
| CS_UNLOCK(drvdata->base); |
| /* Process as per ARM's TRM recommendation */ |
| stmsper = readl_relaxed(drvdata->base + STMSPER); |
| writel_relaxed(0x0, drvdata->base + STMSPER); |
| writel_relaxed(drvdata->stmspscr, drvdata->base + STMSPSCR); |
| writel_relaxed(stmsper, drvdata->base + STMSPER); |
| CS_LOCK(drvdata->base); |
| } |
| spin_unlock(&drvdata->spinlock); |
| |
| return size; |
| } |
| static DEVICE_ATTR_RW(port_select); |
| |
| static ssize_t port_enable_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct stm_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| unsigned long val; |
| |
| if (!local_read(&drvdata->mode)) { |
| val = drvdata->stmsper; |
| } else { |
| spin_lock(&drvdata->spinlock); |
| val = readl_relaxed(drvdata->base + STMSPER); |
| spin_unlock(&drvdata->spinlock); |
| } |
| |
| return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); |
| } |
| |
| static ssize_t port_enable_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t size) |
| { |
| struct stm_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| unsigned long val; |
| int ret = 0; |
| |
| ret = kstrtoul(buf, 16, &val); |
| if (ret) |
| return ret; |
| |
| spin_lock(&drvdata->spinlock); |
| drvdata->stmsper = val; |
| |
| if (local_read(&drvdata->mode)) { |
| CS_UNLOCK(drvdata->base); |
| writel_relaxed(drvdata->stmsper, drvdata->base + STMSPER); |
| CS_LOCK(drvdata->base); |
| } |
| spin_unlock(&drvdata->spinlock); |
| |
| return size; |
| } |
| static DEVICE_ATTR_RW(port_enable); |
| |
| static ssize_t traceid_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| unsigned long val; |
| struct stm_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| |
| val = drvdata->traceid; |
| return sprintf(buf, "%#lx\n", val); |
| } |
| |
| static ssize_t traceid_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t size) |
| { |
| int ret; |
| unsigned long val; |
| struct stm_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| |
| ret = kstrtoul(buf, 16, &val); |
| if (ret) |
| return ret; |
| |
| /* traceid field is 7bit wide on STM32 */ |
| drvdata->traceid = val & 0x7f; |
| return size; |
| } |
| static DEVICE_ATTR_RW(traceid); |
| |
| #define coresight_stm_reg(name, offset) \ |
| coresight_simple_reg32(struct stm_drvdata, name, offset) |
| |
| coresight_stm_reg(tcsr, STMTCSR); |
| coresight_stm_reg(tsfreqr, STMTSFREQR); |
| coresight_stm_reg(syncr, STMSYNCR); |
| coresight_stm_reg(sper, STMSPER); |
| coresight_stm_reg(spter, STMSPTER); |
| coresight_stm_reg(privmaskr, STMPRIVMASKR); |
| coresight_stm_reg(spscr, STMSPSCR); |
| coresight_stm_reg(spmscr, STMSPMSCR); |
| coresight_stm_reg(spfeat1r, STMSPFEAT1R); |
| coresight_stm_reg(spfeat2r, STMSPFEAT2R); |
| coresight_stm_reg(spfeat3r, STMSPFEAT3R); |
| coresight_stm_reg(devid, CORESIGHT_DEVID); |
| |
| static struct attribute *coresight_stm_attrs[] = { |
| &dev_attr_hwevent_enable.attr, |
| &dev_attr_hwevent_select.attr, |
| &dev_attr_port_enable.attr, |
| &dev_attr_port_select.attr, |
| &dev_attr_traceid.attr, |
| NULL, |
| }; |
| |
| static struct attribute *coresight_stm_mgmt_attrs[] = { |
| &dev_attr_tcsr.attr, |
| &dev_attr_tsfreqr.attr, |
| &dev_attr_syncr.attr, |
| &dev_attr_sper.attr, |
| &dev_attr_spter.attr, |
| &dev_attr_privmaskr.attr, |
| &dev_attr_spscr.attr, |
| &dev_attr_spmscr.attr, |
| &dev_attr_spfeat1r.attr, |
| &dev_attr_spfeat2r.attr, |
| &dev_attr_spfeat3r.attr, |
| &dev_attr_devid.attr, |
| NULL, |
| }; |
| |
| static const struct attribute_group coresight_stm_group = { |
| .attrs = coresight_stm_attrs, |
| }; |
| |
| static const struct attribute_group coresight_stm_mgmt_group = { |
| .attrs = coresight_stm_mgmt_attrs, |
| .name = "mgmt", |
| }; |
| |
| static const struct attribute_group *coresight_stm_groups[] = { |
| &coresight_stm_group, |
| &coresight_stm_mgmt_group, |
| NULL, |
| }; |
| |
| static int stm_get_resource_byname(struct device_node *np, |
| char *ch_base, struct resource *res) |
| { |
| const char *name = NULL; |
| int index = 0, found = 0; |
| |
| while (!of_property_read_string_index(np, "reg-names", index, &name)) { |
| if (strcmp(ch_base, name)) { |
| index++; |
| continue; |
| } |
| |
| /* We have a match and @index is where it's at */ |
| found = 1; |
| break; |
| } |
| |
| if (!found) |
| return -EINVAL; |
| |
| return of_address_to_resource(np, index, res); |
| } |
| |
| static u32 stm_fundamental_data_size(struct stm_drvdata *drvdata) |
| { |
| u32 stmspfeat2r; |
| |
| if (!IS_ENABLED(CONFIG_64BIT)) |
| return 4; |
| |
| stmspfeat2r = readl_relaxed(drvdata->base + STMSPFEAT2R); |
| |
| /* |
| * bit[15:12] represents the fundamental data size |
| * 0 - 32-bit data |
| * 1 - 64-bit data |
| */ |
| return BMVAL(stmspfeat2r, 12, 15) ? 8 : 4; |
| } |
| |
| static u32 stm_num_stimulus_port(struct stm_drvdata *drvdata) |
| { |
| u32 numsp; |
| |
| numsp = readl_relaxed(drvdata->base + CORESIGHT_DEVID); |
| /* |
| * NUMPS in STMDEVID is 17 bit long and if equal to 0x0, |
| * 32 stimulus ports are supported. |
| */ |
| numsp &= 0x1ffff; |
| if (!numsp) |
| numsp = STM_32_CHANNEL; |
| return numsp; |
| } |
| |
| static void stm_init_default_data(struct stm_drvdata *drvdata) |
| { |
| /* Don't use port selection */ |
| drvdata->stmspscr = 0x0; |
| /* |
| * Enable all channel regardless of their number. When port |
| * selection isn't used (see above) STMSPER applies to all |
| * 32 channel group available, hence setting all 32 bits to 1 |
| */ |
| drvdata->stmsper = ~0x0; |
| |
| /* |
| * The trace ID value for *ETM* tracers start at CPU_ID * 2 + 0x10 and |
| * anything equal to or higher than 0x70 is reserved. Since 0x00 is |
| * also reserved the STM trace ID needs to be higher than 0x00 and |
| * lowner than 0x10. |
| */ |
| drvdata->traceid = 0x1; |
| |
| /* Set invariant transaction timing on all channels */ |
| bitmap_clear(drvdata->chs.guaranteed, 0, drvdata->numsp); |
| } |
| |
| static void stm_init_generic_data(struct stm_drvdata *drvdata) |
| { |
| drvdata->stm.name = dev_name(drvdata->dev); |
| |
| /* |
| * MasterIDs are assigned at HW design phase. As such the core is |
| * using a single master for interaction with this device. |
| */ |
| drvdata->stm.sw_start = 1; |
| drvdata->stm.sw_end = 1; |
| drvdata->stm.hw_override = true; |
| drvdata->stm.sw_nchannels = drvdata->numsp; |
| drvdata->stm.sw_mmiosz = BYTES_PER_CHANNEL; |
| drvdata->stm.packet = stm_generic_packet; |
| drvdata->stm.mmio_addr = stm_mmio_addr; |
| drvdata->stm.link = stm_generic_link; |
| drvdata->stm.unlink = stm_generic_unlink; |
| drvdata->stm.set_options = stm_generic_set_options; |
| } |
| |
| static int stm_probe(struct amba_device *adev, const struct amba_id *id) |
| { |
| int ret; |
| void __iomem *base; |
| unsigned long *guaranteed; |
| struct device *dev = &adev->dev; |
| struct coresight_platform_data *pdata = NULL; |
| struct stm_drvdata *drvdata; |
| struct resource *res = &adev->res; |
| struct resource ch_res; |
| size_t bitmap_size; |
| struct coresight_desc desc = { 0 }; |
| struct device_node *np = adev->dev.of_node; |
| |
| if (np) { |
| pdata = of_get_coresight_platform_data(dev, np); |
| if (IS_ERR(pdata)) |
| return PTR_ERR(pdata); |
| adev->dev.platform_data = pdata; |
| } |
| drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); |
| if (!drvdata) |
| return -ENOMEM; |
| |
| drvdata->dev = &adev->dev; |
| drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */ |
| if (!IS_ERR(drvdata->atclk)) { |
| ret = clk_prepare_enable(drvdata->atclk); |
| if (ret) |
| return ret; |
| } |
| dev_set_drvdata(dev, drvdata); |
| |
| base = devm_ioremap_resource(dev, res); |
| if (IS_ERR(base)) |
| return PTR_ERR(base); |
| drvdata->base = base; |
| |
| ret = stm_get_resource_byname(np, "stm-stimulus-base", &ch_res); |
| if (ret) |
| return ret; |
| drvdata->chs.phys = ch_res.start; |
| |
| base = devm_ioremap_resource(dev, &ch_res); |
| if (IS_ERR(base)) |
| return PTR_ERR(base); |
| drvdata->chs.base = base; |
| |
| drvdata->write_bytes = stm_fundamental_data_size(drvdata); |
| |
| if (boot_nr_channel) |
| drvdata->numsp = boot_nr_channel; |
| else |
| drvdata->numsp = stm_num_stimulus_port(drvdata); |
| |
| bitmap_size = BITS_TO_LONGS(drvdata->numsp) * sizeof(long); |
| |
| guaranteed = devm_kzalloc(dev, bitmap_size, GFP_KERNEL); |
| if (!guaranteed) |
| return -ENOMEM; |
| drvdata->chs.guaranteed = guaranteed; |
| |
| spin_lock_init(&drvdata->spinlock); |
| |
| stm_init_default_data(drvdata); |
| stm_init_generic_data(drvdata); |
| |
| if (stm_register_device(dev, &drvdata->stm, THIS_MODULE)) { |
| dev_info(dev, |
| "stm_register_device failed, probing deferred\n"); |
| return -EPROBE_DEFER; |
| } |
| |
| desc.type = CORESIGHT_DEV_TYPE_SOURCE; |
| desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE; |
| desc.ops = &stm_cs_ops; |
| desc.pdata = pdata; |
| desc.dev = dev; |
| desc.groups = coresight_stm_groups; |
| drvdata->csdev = coresight_register(&desc); |
| if (IS_ERR(drvdata->csdev)) { |
| ret = PTR_ERR(drvdata->csdev); |
| goto stm_unregister; |
| } |
| |
| pm_runtime_put(&adev->dev); |
| |
| dev_info(dev, "%s initialized\n", (char *)coresight_get_uci_data(id)); |
| return 0; |
| |
| stm_unregister: |
| stm_unregister_device(&drvdata->stm); |
| return ret; |
| } |
| |
| #ifdef CONFIG_PM |
| static int stm_runtime_suspend(struct device *dev) |
| { |
| struct stm_drvdata *drvdata = dev_get_drvdata(dev); |
| |
| if (drvdata && !IS_ERR(drvdata->atclk)) |
| clk_disable_unprepare(drvdata->atclk); |
| |
| return 0; |
| } |
| |
| static int stm_runtime_resume(struct device *dev) |
| { |
| struct stm_drvdata *drvdata = dev_get_drvdata(dev); |
| |
| if (drvdata && !IS_ERR(drvdata->atclk)) |
| clk_prepare_enable(drvdata->atclk); |
| |
| return 0; |
| } |
| #endif |
| |
| static const struct dev_pm_ops stm_dev_pm_ops = { |
| SET_RUNTIME_PM_OPS(stm_runtime_suspend, stm_runtime_resume, NULL) |
| }; |
| |
| static const struct amba_id stm_ids[] = { |
| CS_AMBA_ID_DATA(0x000bb962, "STM32"), |
| CS_AMBA_ID_DATA(0x000bb963, "STM500"), |
| { 0, 0}, |
| }; |
| |
| static struct amba_driver stm_driver = { |
| .drv = { |
| .name = "coresight-stm", |
| .owner = THIS_MODULE, |
| .pm = &stm_dev_pm_ops, |
| .suppress_bind_attrs = true, |
| }, |
| .probe = stm_probe, |
| .id_table = stm_ids, |
| }; |
| |
| builtin_amba_driver(stm_driver); |