| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Sudeep Holla | 3554 | 75.91% | 14 | 35.00% |
| Neil Armstrong | 510 | 10.89% | 3 | 7.50% |
| Punit Agrawal | 211 | 4.51% | 1 | 2.50% |
| Heiner Kallweit | 207 | 4.42% | 12 | 30.00% |
| Olof Johansson | 148 | 3.16% | 1 | 2.50% |
| Martin Blumenstingl | 11 | 0.23% | 1 | 2.50% |
| Alexey Klimov | 11 | 0.23% | 1 | 2.50% |
| Peter Chen | 11 | 0.23% | 1 | 2.50% |
| Dan Carpenter | 7 | 0.15% | 1 | 2.50% |
| Greg Kroah-Hartman | 5 | 0.11% | 1 | 2.50% |
| Kees Cook | 2 | 0.04% | 1 | 2.50% |
| Thomas Gleixner | 2 | 0.04% | 1 | 2.50% |
| Gustavo A. R. Silva | 2 | 0.04% | 1 | 2.50% |
| Rob Herring | 1 | 0.02% | 1 | 2.50% |
| Total | 4682 | 40 |
// SPDX-License-Identifier: GPL-2.0-only /* * System Control and Power Interface (SCPI) Message Protocol driver * * SCPI Message Protocol is used between the System Control Processor(SCP) * and the Application Processors(AP). The Message Handling Unit(MHU) * provides a mechanism for inter-processor communication between SCP's * Cortex M3 and AP. * * SCP offers control and management of the core/cluster power states, * various power domain DVFS including the core/cluster, certain system * clocks configuration, thermal sensors and many others. * * Copyright (C) 2015 ARM Ltd. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/bitmap.h> #include <linux/bitfield.h> #include <linux/device.h> #include <linux/err.h> #include <linux/export.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/list.h> #include <linux/mailbox_client.h> #include <linux/module.h> #include <linux/of_address.h> #include <linux/of_platform.h> #include <linux/printk.h> #include <linux/pm_opp.h> #include <linux/scpi_protocol.h> #include <linux/slab.h> #include <linux/sort.h> #include <linux/spinlock.h> #define CMD_ID_MASK GENMASK(6, 0) #define CMD_TOKEN_ID_MASK GENMASK(15, 8) #define CMD_DATA_SIZE_MASK GENMASK(24, 16) #define CMD_LEGACY_DATA_SIZE_MASK GENMASK(28, 20) #define PACK_SCPI_CMD(cmd_id, tx_sz) \ (FIELD_PREP(CMD_ID_MASK, cmd_id) | \ FIELD_PREP(CMD_DATA_SIZE_MASK, tx_sz)) #define PACK_LEGACY_SCPI_CMD(cmd_id, tx_sz) \ (FIELD_PREP(CMD_ID_MASK, cmd_id) | \ FIELD_PREP(CMD_LEGACY_DATA_SIZE_MASK, tx_sz)) #define CMD_SIZE(cmd) FIELD_GET(CMD_DATA_SIZE_MASK, cmd) #define CMD_UNIQ_MASK (CMD_TOKEN_ID_MASK | CMD_ID_MASK) #define CMD_XTRACT_UNIQ(cmd) ((cmd) & CMD_UNIQ_MASK) #define SCPI_SLOT 0 #define MAX_DVFS_DOMAINS 8 #define MAX_DVFS_OPPS 16 #define PROTO_REV_MAJOR_MASK GENMASK(31, 16) #define PROTO_REV_MINOR_MASK GENMASK(15, 0) #define FW_REV_MAJOR_MASK GENMASK(31, 24) #define FW_REV_MINOR_MASK GENMASK(23, 16) #define FW_REV_PATCH_MASK GENMASK(15, 0) #define MAX_RX_TIMEOUT (msecs_to_jiffies(30)) enum scpi_error_codes { SCPI_SUCCESS = 0, /* Success */ SCPI_ERR_PARAM = 1, /* Invalid parameter(s) */ SCPI_ERR_ALIGN = 2, /* Invalid alignment */ SCPI_ERR_SIZE = 3, /* Invalid size */ SCPI_ERR_HANDLER = 4, /* Invalid handler/callback */ SCPI_ERR_ACCESS = 5, /* Invalid access/permission denied */ SCPI_ERR_RANGE = 6, /* Value out of range */ SCPI_ERR_TIMEOUT = 7, /* Timeout has occurred */ SCPI_ERR_NOMEM = 8, /* Invalid memory area or pointer */ SCPI_ERR_PWRSTATE = 9, /* Invalid power state */ SCPI_ERR_SUPPORT = 10, /* Not supported or disabled */ SCPI_ERR_DEVICE = 11, /* Device error */ SCPI_ERR_BUSY = 12, /* Device busy */ SCPI_ERR_MAX }; /* SCPI Standard commands */ enum scpi_std_cmd { SCPI_CMD_INVALID = 0x00, SCPI_CMD_SCPI_READY = 0x01, SCPI_CMD_SCPI_CAPABILITIES = 0x02, SCPI_CMD_SET_CSS_PWR_STATE = 0x03, SCPI_CMD_GET_CSS_PWR_STATE = 0x04, SCPI_CMD_SET_SYS_PWR_STATE = 0x05, SCPI_CMD_SET_CPU_TIMER = 0x06, SCPI_CMD_CANCEL_CPU_TIMER = 0x07, SCPI_CMD_DVFS_CAPABILITIES = 0x08, SCPI_CMD_GET_DVFS_INFO = 0x09, SCPI_CMD_SET_DVFS = 0x0a, SCPI_CMD_GET_DVFS = 0x0b, SCPI_CMD_GET_DVFS_STAT = 0x0c, SCPI_CMD_CLOCK_CAPABILITIES = 0x0d, SCPI_CMD_GET_CLOCK_INFO = 0x0e, SCPI_CMD_SET_CLOCK_VALUE = 0x0f, SCPI_CMD_GET_CLOCK_VALUE = 0x10, SCPI_CMD_PSU_CAPABILITIES = 0x11, SCPI_CMD_GET_PSU_INFO = 0x12, SCPI_CMD_SET_PSU = 0x13, SCPI_CMD_GET_PSU = 0x14, SCPI_CMD_SENSOR_CAPABILITIES = 0x15, SCPI_CMD_SENSOR_INFO = 0x16, SCPI_CMD_SENSOR_VALUE = 0x17, SCPI_CMD_SENSOR_CFG_PERIODIC = 0x18, SCPI_CMD_SENSOR_CFG_BOUNDS = 0x19, SCPI_CMD_SENSOR_ASYNC_VALUE = 0x1a, SCPI_CMD_SET_DEVICE_PWR_STATE = 0x1b, SCPI_CMD_GET_DEVICE_PWR_STATE = 0x1c, SCPI_CMD_COUNT }; /* SCPI Legacy Commands */ enum legacy_scpi_std_cmd { LEGACY_SCPI_CMD_INVALID = 0x00, LEGACY_SCPI_CMD_SCPI_READY = 0x01, LEGACY_SCPI_CMD_SCPI_CAPABILITIES = 0x02, LEGACY_SCPI_CMD_EVENT = 0x03, LEGACY_SCPI_CMD_SET_CSS_PWR_STATE = 0x04, LEGACY_SCPI_CMD_GET_CSS_PWR_STATE = 0x05, LEGACY_SCPI_CMD_CFG_PWR_STATE_STAT = 0x06, LEGACY_SCPI_CMD_GET_PWR_STATE_STAT = 0x07, LEGACY_SCPI_CMD_SYS_PWR_STATE = 0x08, LEGACY_SCPI_CMD_L2_READY = 0x09, LEGACY_SCPI_CMD_SET_AP_TIMER = 0x0a, LEGACY_SCPI_CMD_CANCEL_AP_TIME = 0x0b, LEGACY_SCPI_CMD_DVFS_CAPABILITIES = 0x0c, LEGACY_SCPI_CMD_GET_DVFS_INFO = 0x0d, LEGACY_SCPI_CMD_SET_DVFS = 0x0e, LEGACY_SCPI_CMD_GET_DVFS = 0x0f, LEGACY_SCPI_CMD_GET_DVFS_STAT = 0x10, LEGACY_SCPI_CMD_SET_RTC = 0x11, LEGACY_SCPI_CMD_GET_RTC = 0x12, LEGACY_SCPI_CMD_CLOCK_CAPABILITIES = 0x13, LEGACY_SCPI_CMD_SET_CLOCK_INDEX = 0x14, LEGACY_SCPI_CMD_SET_CLOCK_VALUE = 0x15, LEGACY_SCPI_CMD_GET_CLOCK_VALUE = 0x16, LEGACY_SCPI_CMD_PSU_CAPABILITIES = 0x17, LEGACY_SCPI_CMD_SET_PSU = 0x18, LEGACY_SCPI_CMD_GET_PSU = 0x19, LEGACY_SCPI_CMD_SENSOR_CAPABILITIES = 0x1a, LEGACY_SCPI_CMD_SENSOR_INFO = 0x1b, LEGACY_SCPI_CMD_SENSOR_VALUE = 0x1c, LEGACY_SCPI_CMD_SENSOR_CFG_PERIODIC = 0x1d, LEGACY_SCPI_CMD_SENSOR_CFG_BOUNDS = 0x1e, LEGACY_SCPI_CMD_SENSOR_ASYNC_VALUE = 0x1f, LEGACY_SCPI_CMD_COUNT }; /* List all commands that are required to go through the high priority link */ static int legacy_hpriority_cmds[] = { LEGACY_SCPI_CMD_GET_CSS_PWR_STATE, LEGACY_SCPI_CMD_CFG_PWR_STATE_STAT, LEGACY_SCPI_CMD_GET_PWR_STATE_STAT, LEGACY_SCPI_CMD_SET_DVFS, LEGACY_SCPI_CMD_GET_DVFS, LEGACY_SCPI_CMD_SET_RTC, LEGACY_SCPI_CMD_GET_RTC, LEGACY_SCPI_CMD_SET_CLOCK_INDEX, LEGACY_SCPI_CMD_SET_CLOCK_VALUE, LEGACY_SCPI_CMD_GET_CLOCK_VALUE, LEGACY_SCPI_CMD_SET_PSU, LEGACY_SCPI_CMD_GET_PSU, LEGACY_SCPI_CMD_SENSOR_CFG_PERIODIC, LEGACY_SCPI_CMD_SENSOR_CFG_BOUNDS, }; /* List all commands used by this driver, used as indexes */ enum scpi_drv_cmds { CMD_SCPI_CAPABILITIES = 0, CMD_GET_CLOCK_INFO, CMD_GET_CLOCK_VALUE, CMD_SET_CLOCK_VALUE, CMD_GET_DVFS, CMD_SET_DVFS, CMD_GET_DVFS_INFO, CMD_SENSOR_CAPABILITIES, CMD_SENSOR_INFO, CMD_SENSOR_VALUE, CMD_SET_DEVICE_PWR_STATE, CMD_GET_DEVICE_PWR_STATE, CMD_MAX_COUNT, }; static int scpi_std_commands[CMD_MAX_COUNT] = { SCPI_CMD_SCPI_CAPABILITIES, SCPI_CMD_GET_CLOCK_INFO, SCPI_CMD_GET_CLOCK_VALUE, SCPI_CMD_SET_CLOCK_VALUE, SCPI_CMD_GET_DVFS, SCPI_CMD_SET_DVFS, SCPI_CMD_GET_DVFS_INFO, SCPI_CMD_SENSOR_CAPABILITIES, SCPI_CMD_SENSOR_INFO, SCPI_CMD_SENSOR_VALUE, SCPI_CMD_SET_DEVICE_PWR_STATE, SCPI_CMD_GET_DEVICE_PWR_STATE, }; static int scpi_legacy_commands[CMD_MAX_COUNT] = { LEGACY_SCPI_CMD_SCPI_CAPABILITIES, -1, /* GET_CLOCK_INFO */ LEGACY_SCPI_CMD_GET_CLOCK_VALUE, LEGACY_SCPI_CMD_SET_CLOCK_VALUE, LEGACY_SCPI_CMD_GET_DVFS, LEGACY_SCPI_CMD_SET_DVFS, LEGACY_SCPI_CMD_GET_DVFS_INFO, LEGACY_SCPI_CMD_SENSOR_CAPABILITIES, LEGACY_SCPI_CMD_SENSOR_INFO, LEGACY_SCPI_CMD_SENSOR_VALUE, -1, /* SET_DEVICE_PWR_STATE */ -1, /* GET_DEVICE_PWR_STATE */ }; struct scpi_xfer { u32 slot; /* has to be first element */ u32 cmd; u32 status; const void *tx_buf; void *rx_buf; unsigned int tx_len; unsigned int rx_len; struct list_head node; struct completion done; }; struct scpi_chan { struct mbox_client cl; struct mbox_chan *chan; void __iomem *tx_payload; void __iomem *rx_payload; struct list_head rx_pending; struct list_head xfers_list; struct scpi_xfer *xfers; spinlock_t rx_lock; /* locking for the rx pending list */ struct mutex xfers_lock; u8 token; }; struct scpi_drvinfo { u32 protocol_version; u32 firmware_version; bool is_legacy; int num_chans; int *commands; DECLARE_BITMAP(cmd_priority, LEGACY_SCPI_CMD_COUNT); atomic_t next_chan; struct scpi_ops *scpi_ops; struct scpi_chan *channels; struct scpi_dvfs_info *dvfs[MAX_DVFS_DOMAINS]; }; /* * The SCP firmware only executes in little-endian mode, so any buffers * shared through SCPI should have their contents converted to little-endian */ struct scpi_shared_mem { __le32 command; __le32 status; u8 payload[]; } __packed; struct legacy_scpi_shared_mem { __le32 status; u8 payload[]; } __packed; struct scp_capabilities { __le32 protocol_version; __le32 event_version; __le32 platform_version; __le32 commands[4]; } __packed; struct clk_get_info { __le16 id; __le16 flags; __le32 min_rate; __le32 max_rate; u8 name[20]; } __packed; struct clk_set_value { __le16 id; __le16 reserved; __le32 rate; } __packed; struct legacy_clk_set_value { __le32 rate; __le16 id; __le16 reserved; } __packed; struct dvfs_info { u8 domain; u8 opp_count; __le16 latency; struct { __le32 freq; __le32 m_volt; } opps[MAX_DVFS_OPPS]; } __packed; struct dvfs_set { u8 domain; u8 index; } __packed; struct _scpi_sensor_info { __le16 sensor_id; u8 class; u8 trigger_type; char name[20]; }; struct dev_pstate_set { __le16 dev_id; u8 pstate; } __packed; static struct scpi_drvinfo *scpi_info; static int scpi_linux_errmap[SCPI_ERR_MAX] = { /* better than switch case as long as return value is continuous */ 0, /* SCPI_SUCCESS */ -EINVAL, /* SCPI_ERR_PARAM */ -ENOEXEC, /* SCPI_ERR_ALIGN */ -EMSGSIZE, /* SCPI_ERR_SIZE */ -EINVAL, /* SCPI_ERR_HANDLER */ -EACCES, /* SCPI_ERR_ACCESS */ -ERANGE, /* SCPI_ERR_RANGE */ -ETIMEDOUT, /* SCPI_ERR_TIMEOUT */ -ENOMEM, /* SCPI_ERR_NOMEM */ -EINVAL, /* SCPI_ERR_PWRSTATE */ -EOPNOTSUPP, /* SCPI_ERR_SUPPORT */ -EIO, /* SCPI_ERR_DEVICE */ -EBUSY, /* SCPI_ERR_BUSY */ }; static inline int scpi_to_linux_errno(int errno) { if (errno >= SCPI_SUCCESS && errno < SCPI_ERR_MAX) return scpi_linux_errmap[errno]; return -EIO; } static void scpi_process_cmd(struct scpi_chan *ch, u32 cmd) { unsigned long flags; struct scpi_xfer *t, *match = NULL; spin_lock_irqsave(&ch->rx_lock, flags); if (list_empty(&ch->rx_pending)) { spin_unlock_irqrestore(&ch->rx_lock, flags); return; } /* Command type is not replied by the SCP Firmware in legacy Mode * We should consider that command is the head of pending RX commands * if the list is not empty. In TX only mode, the list would be empty. */ if (scpi_info->is_legacy) { match = list_first_entry(&ch->rx_pending, struct scpi_xfer, node); list_del(&match->node); } else { list_for_each_entry(t, &ch->rx_pending, node) if (CMD_XTRACT_UNIQ(t->cmd) == CMD_XTRACT_UNIQ(cmd)) { list_del(&t->node); match = t; break; } } /* check if wait_for_completion is in progress or timed-out */ if (match && !completion_done(&match->done)) { unsigned int len; if (scpi_info->is_legacy) { struct legacy_scpi_shared_mem __iomem *mem = ch->rx_payload; /* RX Length is not replied by the legacy Firmware */ len = match->rx_len; match->status = ioread32(&mem->status); memcpy_fromio(match->rx_buf, mem->payload, len); } else { struct scpi_shared_mem __iomem *mem = ch->rx_payload; len = min_t(unsigned int, match->rx_len, CMD_SIZE(cmd)); match->status = ioread32(&mem->status); memcpy_fromio(match->rx_buf, mem->payload, len); } if (match->rx_len > len) memset(match->rx_buf + len, 0, match->rx_len - len); complete(&match->done); } spin_unlock_irqrestore(&ch->rx_lock, flags); } static void scpi_handle_remote_msg(struct mbox_client *c, void *msg) { struct scpi_chan *ch = container_of(c, struct scpi_chan, cl); struct scpi_shared_mem __iomem *mem = ch->rx_payload; u32 cmd = 0; if (!scpi_info->is_legacy) cmd = ioread32(&mem->command); scpi_process_cmd(ch, cmd); } static void scpi_tx_prepare(struct mbox_client *c, void *msg) { unsigned long flags; struct scpi_xfer *t = msg; struct scpi_chan *ch = container_of(c, struct scpi_chan, cl); struct scpi_shared_mem __iomem *mem = ch->tx_payload; if (t->tx_buf) { if (scpi_info->is_legacy) memcpy_toio(ch->tx_payload, t->tx_buf, t->tx_len); else memcpy_toio(mem->payload, t->tx_buf, t->tx_len); } if (t->rx_buf) { if (!(++ch->token)) ++ch->token; t->cmd |= FIELD_PREP(CMD_TOKEN_ID_MASK, ch->token); spin_lock_irqsave(&ch->rx_lock, flags); list_add_tail(&t->node, &ch->rx_pending); spin_unlock_irqrestore(&ch->rx_lock, flags); } if (!scpi_info->is_legacy) iowrite32(t->cmd, &mem->command); } static struct scpi_xfer *get_scpi_xfer(struct scpi_chan *ch) { struct scpi_xfer *t; mutex_lock(&ch->xfers_lock); if (list_empty(&ch->xfers_list)) { mutex_unlock(&ch->xfers_lock); return NULL; } t = list_first_entry(&ch->xfers_list, struct scpi_xfer, node); list_del(&t->node); mutex_unlock(&ch->xfers_lock); return t; } static void put_scpi_xfer(struct scpi_xfer *t, struct scpi_chan *ch) { mutex_lock(&ch->xfers_lock); list_add_tail(&t->node, &ch->xfers_list); mutex_unlock(&ch->xfers_lock); } static int scpi_send_message(u8 idx, void *tx_buf, unsigned int tx_len, void *rx_buf, unsigned int rx_len) { int ret; u8 chan; u8 cmd; struct scpi_xfer *msg; struct scpi_chan *scpi_chan; if (scpi_info->commands[idx] < 0) return -EOPNOTSUPP; cmd = scpi_info->commands[idx]; if (scpi_info->is_legacy) chan = test_bit(cmd, scpi_info->cmd_priority) ? 1 : 0; else chan = atomic_inc_return(&scpi_info->next_chan) % scpi_info->num_chans; scpi_chan = scpi_info->channels + chan; msg = get_scpi_xfer(scpi_chan); if (!msg) return -ENOMEM; if (scpi_info->is_legacy) { msg->cmd = PACK_LEGACY_SCPI_CMD(cmd, tx_len); msg->slot = msg->cmd; } else { msg->slot = BIT(SCPI_SLOT); msg->cmd = PACK_SCPI_CMD(cmd, tx_len); } msg->tx_buf = tx_buf; msg->tx_len = tx_len; msg->rx_buf = rx_buf; msg->rx_len = rx_len; reinit_completion(&msg->done); ret = mbox_send_message(scpi_chan->chan, msg); if (ret < 0 || !rx_buf) goto out; if (!wait_for_completion_timeout(&msg->done, MAX_RX_TIMEOUT)) ret = -ETIMEDOUT; else /* first status word */ ret = msg->status; out: if (ret < 0 && rx_buf) /* remove entry from the list if timed-out */ scpi_process_cmd(scpi_chan, msg->cmd); put_scpi_xfer(msg, scpi_chan); /* SCPI error codes > 0, translate them to Linux scale*/ return ret > 0 ? scpi_to_linux_errno(ret) : ret; } static u32 scpi_get_version(void) { return scpi_info->protocol_version; } static int scpi_clk_get_range(u16 clk_id, unsigned long *min, unsigned long *max) { int ret; struct clk_get_info clk; __le16 le_clk_id = cpu_to_le16(clk_id); ret = scpi_send_message(CMD_GET_CLOCK_INFO, &le_clk_id, sizeof(le_clk_id), &clk, sizeof(clk)); if (!ret) { *min = le32_to_cpu(clk.min_rate); *max = le32_to_cpu(clk.max_rate); } return ret; } static unsigned long scpi_clk_get_val(u16 clk_id) { int ret; __le32 rate; __le16 le_clk_id = cpu_to_le16(clk_id); ret = scpi_send_message(CMD_GET_CLOCK_VALUE, &le_clk_id, sizeof(le_clk_id), &rate, sizeof(rate)); if (ret) return 0; return le32_to_cpu(rate); } static int scpi_clk_set_val(u16 clk_id, unsigned long rate) { int stat; struct clk_set_value clk = { .id = cpu_to_le16(clk_id), .rate = cpu_to_le32(rate) }; return scpi_send_message(CMD_SET_CLOCK_VALUE, &clk, sizeof(clk), &stat, sizeof(stat)); } static int legacy_scpi_clk_set_val(u16 clk_id, unsigned long rate) { int stat; struct legacy_clk_set_value clk = { .id = cpu_to_le16(clk_id), .rate = cpu_to_le32(rate) }; return scpi_send_message(CMD_SET_CLOCK_VALUE, &clk, sizeof(clk), &stat, sizeof(stat)); } static int scpi_dvfs_get_idx(u8 domain) { int ret; u8 dvfs_idx; ret = scpi_send_message(CMD_GET_DVFS, &domain, sizeof(domain), &dvfs_idx, sizeof(dvfs_idx)); return ret ? ret : dvfs_idx; } static int scpi_dvfs_set_idx(u8 domain, u8 index) { int stat; struct dvfs_set dvfs = {domain, index}; return scpi_send_message(CMD_SET_DVFS, &dvfs, sizeof(dvfs), &stat, sizeof(stat)); } static int opp_cmp_func(const void *opp1, const void *opp2) { const struct scpi_opp *t1 = opp1, *t2 = opp2; return t1->freq - t2->freq; } static struct scpi_dvfs_info *scpi_dvfs_get_info(u8 domain) { struct scpi_dvfs_info *info; struct scpi_opp *opp; struct dvfs_info buf; int ret, i; if (domain >= MAX_DVFS_DOMAINS) return ERR_PTR(-EINVAL); if (scpi_info->dvfs[domain]) /* data already populated */ return scpi_info->dvfs[domain]; ret = scpi_send_message(CMD_GET_DVFS_INFO, &domain, sizeof(domain), &buf, sizeof(buf)); if (ret) return ERR_PTR(ret); info = kmalloc(sizeof(*info), GFP_KERNEL); if (!info) return ERR_PTR(-ENOMEM); info->count = buf.opp_count; info->latency = le16_to_cpu(buf.latency) * 1000; /* uS to nS */ info->opps = kcalloc(info->count, sizeof(*opp), GFP_KERNEL); if (!info->opps) { kfree(info); return ERR_PTR(-ENOMEM); } for (i = 0, opp = info->opps; i < info->count; i++, opp++) { opp->freq = le32_to_cpu(buf.opps[i].freq); opp->m_volt = le32_to_cpu(buf.opps[i].m_volt); } sort(info->opps, info->count, sizeof(*opp), opp_cmp_func, NULL); scpi_info->dvfs[domain] = info; return info; } static int scpi_dev_domain_id(struct device *dev) { struct of_phandle_args clkspec; if (of_parse_phandle_with_args(dev->of_node, "clocks", "#clock-cells", 0, &clkspec)) return -EINVAL; return clkspec.args[0]; } static struct scpi_dvfs_info *scpi_dvfs_info(struct device *dev) { int domain = scpi_dev_domain_id(dev); if (domain < 0) return ERR_PTR(domain); return scpi_dvfs_get_info(domain); } static int scpi_dvfs_get_transition_latency(struct device *dev) { struct scpi_dvfs_info *info = scpi_dvfs_info(dev); if (IS_ERR(info)) return PTR_ERR(info); return info->latency; } static int scpi_dvfs_add_opps_to_device(struct device *dev) { int idx, ret; struct scpi_opp *opp; struct scpi_dvfs_info *info = scpi_dvfs_info(dev); if (IS_ERR(info)) return PTR_ERR(info); if (!info->opps) return -EIO; for (opp = info->opps, idx = 0; idx < info->count; idx++, opp++) { ret = dev_pm_opp_add(dev, opp->freq, opp->m_volt * 1000); if (ret) { dev_warn(dev, "failed to add opp %uHz %umV\n", opp->freq, opp->m_volt); while (idx-- > 0) dev_pm_opp_remove(dev, (--opp)->freq); return ret; } } return 0; } static int scpi_sensor_get_capability(u16 *sensors) { __le16 cap; int ret; ret = scpi_send_message(CMD_SENSOR_CAPABILITIES, NULL, 0, &cap, sizeof(cap)); if (!ret) *sensors = le16_to_cpu(cap); return ret; } static int scpi_sensor_get_info(u16 sensor_id, struct scpi_sensor_info *info) { __le16 id = cpu_to_le16(sensor_id); struct _scpi_sensor_info _info; int ret; ret = scpi_send_message(CMD_SENSOR_INFO, &id, sizeof(id), &_info, sizeof(_info)); if (!ret) { memcpy(info, &_info, sizeof(*info)); info->sensor_id = le16_to_cpu(_info.sensor_id); } return ret; } static int scpi_sensor_get_value(u16 sensor, u64 *val) { __le16 id = cpu_to_le16(sensor); __le64 value; int ret; ret = scpi_send_message(CMD_SENSOR_VALUE, &id, sizeof(id), &value, sizeof(value)); if (ret) return ret; if (scpi_info->is_legacy) /* only 32-bits supported, upper 32 bits can be junk */ *val = le32_to_cpup((__le32 *)&value); else *val = le64_to_cpu(value); return 0; } static int scpi_device_get_power_state(u16 dev_id) { int ret; u8 pstate; __le16 id = cpu_to_le16(dev_id); ret = scpi_send_message(CMD_GET_DEVICE_PWR_STATE, &id, sizeof(id), &pstate, sizeof(pstate)); return ret ? ret : pstate; } static int scpi_device_set_power_state(u16 dev_id, u8 pstate) { int stat; struct dev_pstate_set dev_set = { .dev_id = cpu_to_le16(dev_id), .pstate = pstate, }; return scpi_send_message(CMD_SET_DEVICE_PWR_STATE, &dev_set, sizeof(dev_set), &stat, sizeof(stat)); } static struct scpi_ops scpi_ops = { .get_version = scpi_get_version, .clk_get_range = scpi_clk_get_range, .clk_get_val = scpi_clk_get_val, .clk_set_val = scpi_clk_set_val, .dvfs_get_idx = scpi_dvfs_get_idx, .dvfs_set_idx = scpi_dvfs_set_idx, .dvfs_get_info = scpi_dvfs_get_info, .device_domain_id = scpi_dev_domain_id, .get_transition_latency = scpi_dvfs_get_transition_latency, .add_opps_to_device = scpi_dvfs_add_opps_to_device, .sensor_get_capability = scpi_sensor_get_capability, .sensor_get_info = scpi_sensor_get_info, .sensor_get_value = scpi_sensor_get_value, .device_get_power_state = scpi_device_get_power_state, .device_set_power_state = scpi_device_set_power_state, }; struct scpi_ops *get_scpi_ops(void) { return scpi_info ? scpi_info->scpi_ops : NULL; } EXPORT_SYMBOL_GPL(get_scpi_ops); static int scpi_init_versions(struct scpi_drvinfo *info) { int ret; struct scp_capabilities caps; ret = scpi_send_message(CMD_SCPI_CAPABILITIES, NULL, 0, &caps, sizeof(caps)); if (!ret) { info->protocol_version = le32_to_cpu(caps.protocol_version); info->firmware_version = le32_to_cpu(caps.platform_version); } /* Ignore error if not implemented */ if (info->is_legacy && ret == -EOPNOTSUPP) return 0; return ret; } static ssize_t protocol_version_show(struct device *dev, struct device_attribute *attr, char *buf) { struct scpi_drvinfo *scpi_info = dev_get_drvdata(dev); return sprintf(buf, "%lu.%lu\n", FIELD_GET(PROTO_REV_MAJOR_MASK, scpi_info->protocol_version), FIELD_GET(PROTO_REV_MINOR_MASK, scpi_info->protocol_version)); } static DEVICE_ATTR_RO(protocol_version); static ssize_t firmware_version_show(struct device *dev, struct device_attribute *attr, char *buf) { struct scpi_drvinfo *scpi_info = dev_get_drvdata(dev); return sprintf(buf, "%lu.%lu.%lu\n", FIELD_GET(FW_REV_MAJOR_MASK, scpi_info->firmware_version), FIELD_GET(FW_REV_MINOR_MASK, scpi_info->firmware_version), FIELD_GET(FW_REV_PATCH_MASK, scpi_info->firmware_version)); } static DEVICE_ATTR_RO(firmware_version); static struct attribute *versions_attrs[] = { &dev_attr_firmware_version.attr, &dev_attr_protocol_version.attr, NULL, }; ATTRIBUTE_GROUPS(versions); static void scpi_free_channels(void *data) { struct scpi_drvinfo *info = data; int i; for (i = 0; i < info->num_chans; i++) mbox_free_channel(info->channels[i].chan); } static int scpi_remove(struct platform_device *pdev) { int i; struct scpi_drvinfo *info = platform_get_drvdata(pdev); scpi_info = NULL; /* stop exporting SCPI ops through get_scpi_ops */ for (i = 0; i < MAX_DVFS_DOMAINS && info->dvfs[i]; i++) { kfree(info->dvfs[i]->opps); kfree(info->dvfs[i]); } return 0; } #define MAX_SCPI_XFERS 10 static int scpi_alloc_xfer_list(struct device *dev, struct scpi_chan *ch) { int i; struct scpi_xfer *xfers; xfers = devm_kcalloc(dev, MAX_SCPI_XFERS, sizeof(*xfers), GFP_KERNEL); if (!xfers) return -ENOMEM; ch->xfers = xfers; for (i = 0; i < MAX_SCPI_XFERS; i++, xfers++) { init_completion(&xfers->done); list_add_tail(&xfers->node, &ch->xfers_list); } return 0; } static const struct of_device_id legacy_scpi_of_match[] = { {.compatible = "arm,scpi-pre-1.0"}, {}, }; static const struct of_device_id shmem_of_match[] __maybe_unused = { { .compatible = "amlogic,meson-gxbb-scp-shmem", }, { .compatible = "amlogic,meson-axg-scp-shmem", }, { .compatible = "arm,juno-scp-shmem", }, { .compatible = "arm,scp-shmem", }, { } }; static int scpi_probe(struct platform_device *pdev) { int count, idx, ret; struct resource res; struct device *dev = &pdev->dev; struct device_node *np = dev->of_node; struct scpi_drvinfo *scpi_drvinfo; scpi_drvinfo = devm_kzalloc(dev, sizeof(*scpi_drvinfo), GFP_KERNEL); if (!scpi_drvinfo) return -ENOMEM; if (of_match_device(legacy_scpi_of_match, &pdev->dev)) scpi_drvinfo->is_legacy = true; count = of_count_phandle_with_args(np, "mboxes", "#mbox-cells"); if (count < 0) { dev_err(dev, "no mboxes property in '%pOF'\n", np); return -ENODEV; } scpi_drvinfo->channels = devm_kcalloc(dev, count, sizeof(struct scpi_chan), GFP_KERNEL); if (!scpi_drvinfo->channels) return -ENOMEM; ret = devm_add_action(dev, scpi_free_channels, scpi_drvinfo); if (ret) return ret; for (; scpi_drvinfo->num_chans < count; scpi_drvinfo->num_chans++) { resource_size_t size; int idx = scpi_drvinfo->num_chans; struct scpi_chan *pchan = scpi_drvinfo->channels + idx; struct mbox_client *cl = &pchan->cl; struct device_node *shmem = of_parse_phandle(np, "shmem", idx); if (!of_match_node(shmem_of_match, shmem)) return -ENXIO; ret = of_address_to_resource(shmem, 0, &res); of_node_put(shmem); if (ret) { dev_err(dev, "failed to get SCPI payload mem resource\n"); return ret; } size = resource_size(&res); pchan->rx_payload = devm_ioremap(dev, res.start, size); if (!pchan->rx_payload) { dev_err(dev, "failed to ioremap SCPI payload\n"); return -EADDRNOTAVAIL; } pchan->tx_payload = pchan->rx_payload + (size >> 1); cl->dev = dev; cl->rx_callback = scpi_handle_remote_msg; cl->tx_prepare = scpi_tx_prepare; cl->tx_block = true; cl->tx_tout = 20; cl->knows_txdone = false; /* controller can't ack */ INIT_LIST_HEAD(&pchan->rx_pending); INIT_LIST_HEAD(&pchan->xfers_list); spin_lock_init(&pchan->rx_lock); mutex_init(&pchan->xfers_lock); ret = scpi_alloc_xfer_list(dev, pchan); if (!ret) { pchan->chan = mbox_request_channel(cl, idx); if (!IS_ERR(pchan->chan)) continue; ret = PTR_ERR(pchan->chan); if (ret != -EPROBE_DEFER) dev_err(dev, "failed to get channel%d err %d\n", idx, ret); } return ret; } scpi_drvinfo->commands = scpi_std_commands; platform_set_drvdata(pdev, scpi_drvinfo); if (scpi_drvinfo->is_legacy) { /* Replace with legacy variants */ scpi_ops.clk_set_val = legacy_scpi_clk_set_val; scpi_drvinfo->commands = scpi_legacy_commands; /* Fill priority bitmap */ for (idx = 0; idx < ARRAY_SIZE(legacy_hpriority_cmds); idx++) set_bit(legacy_hpriority_cmds[idx], scpi_drvinfo->cmd_priority); } scpi_info = scpi_drvinfo; ret = scpi_init_versions(scpi_drvinfo); if (ret) { dev_err(dev, "incorrect or no SCP firmware found\n"); scpi_info = NULL; return ret; } if (scpi_drvinfo->is_legacy && !scpi_drvinfo->protocol_version && !scpi_drvinfo->firmware_version) dev_info(dev, "SCP Protocol legacy pre-1.0 firmware\n"); else dev_info(dev, "SCP Protocol %lu.%lu Firmware %lu.%lu.%lu version\n", FIELD_GET(PROTO_REV_MAJOR_MASK, scpi_drvinfo->protocol_version), FIELD_GET(PROTO_REV_MINOR_MASK, scpi_drvinfo->protocol_version), FIELD_GET(FW_REV_MAJOR_MASK, scpi_drvinfo->firmware_version), FIELD_GET(FW_REV_MINOR_MASK, scpi_drvinfo->firmware_version), FIELD_GET(FW_REV_PATCH_MASK, scpi_drvinfo->firmware_version)); scpi_drvinfo->scpi_ops = &scpi_ops; ret = devm_of_platform_populate(dev); if (ret) scpi_info = NULL; return ret; } static const struct of_device_id scpi_of_match[] = { {.compatible = "arm,scpi"}, {.compatible = "arm,scpi-pre-1.0"}, {}, }; MODULE_DEVICE_TABLE(of, scpi_of_match); static struct platform_driver scpi_driver = { .driver = { .name = "scpi_protocol", .of_match_table = scpi_of_match, .dev_groups = versions_groups, }, .probe = scpi_probe, .remove = scpi_remove, }; module_platform_driver(scpi_driver); MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>"); MODULE_DESCRIPTION("ARM SCPI mailbox protocol driver"); MODULE_LICENSE("GPL v2");
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