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ARM SCMI fixes for v5.4 

Couple of fixes: one in scmi reset driver initialising missed scmi handle
 and an other in scmi reset API implementation fixing the assignment of
 reset state
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Merge tag 'scmi-fixes-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux into arm/fixes

ARM SCMI fixes for v5.4

Couple of fixes: one in scmi reset driver initialising missed scmi handle
and an other in scmi reset API implementation fixing the assignment of
reset state

* tag 'scmi-fixes-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux:
  reset: reset-scmi: add missing handle initialisation
  firmware: arm_scmi: reset: fix reset_state assignment in scmi_domain_reset

Link: https://lore.kernel.org/r/20190918142139.GA4370@bogus
Signed-off-by: Olof Johansson <olof@lixom.net>
alistair/sunxi64-5.4-dsi
Olof Johansson 2019-09-29 11:19:18 -07:00
parent b74d957f63 61423712db
commit a4207a1c5e
17 changed files with 1083 additions and 303 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
Documentation/devicetree/bindings/arm/arm,scmi.txt
View File

@ -73,6 +73,16 @@ Required properties:
as used by the firmware. Refer to platform details
for your implementation for the IDs to use.
Reset signal bindings for the reset domains based on SCMI Message Protocol
------------------------------------------------------------
This binding for the SCMI reset domain providers uses the generic reset
signal binding[5].
Required properties:
- #reset-cells : Should be 1. Contains the reset domain ID value used
by SCMI commands.
SRAM and Shared Memory for SCMI
-------------------------------
@ -93,6 +103,7 @@ Required sub-node properties:
[2] Documentation/devicetree/bindings/power/power_domain.txt
[3] Documentation/devicetree/bindings/thermal/thermal.txt
[4] Documentation/devicetree/bindings/sram/sram.txt
[5] Documentation/devicetree/bindings/reset/reset.txt
Example:
@ -152,6 +163,11 @@ firmware {
reg = <0x15>;
#thermal-sensor-cells = <1>;
};
scmi_reset: protocol@16 {
reg = <0x16>;
#reset-cells = <1>;
};
};
};
@ -166,6 +182,7 @@ hdlcd@7ff60000 {
reg = <0 0x7ff60000 0 0x1000>;
clocks = <&scmi_clk 4>;
power-domains = <&scmi_devpd 1>;
resets = <&scmi_reset 10>;
};
thermal-zones {

1
MAINTAINERS
View File

@ -15575,6 +15575,7 @@ F: drivers/clk/clk-sc[mp]i.c
F: drivers/cpufreq/sc[mp]i-cpufreq.c
F: drivers/firmware/arm_scpi.c
F: drivers/firmware/arm_scmi/
F: drivers/reset/reset-scmi.c
F: include/linux/sc[mp]i_protocol.h
SYSTEM RESET/SHUTDOWN DRIVERS

2
drivers/clk/clk-scmi.c
View File

@ -69,7 +69,7 @@ static int scmi_clk_set_rate(struct clk_hw *hw, unsigned long rate,
{
struct scmi_clk *clk = to_scmi_clk(hw);
return clk->handle->clk_ops->rate_set(clk->handle, clk->id, 0, rate);
return clk->handle->clk_ops->rate_set(clk->handle, clk->id, rate);
}
static int scmi_clk_enable(struct clk_hw *hw)

2
drivers/firmware/arm_scmi/Makefile
View File

@ -2,5 +2,5 @@
obj-y = scmi-bus.o scmi-driver.o scmi-protocols.o
scmi-bus-y = bus.o
scmi-driver-y = driver.o
scmi-protocols-y = base.o clock.o perf.o power.o sensors.o
scmi-protocols-y = base.o clock.o perf.o power.o reset.o sensors.o
obj-$(CONFIG_ARM_SCMI_POWER_DOMAIN) += scmi_pm_domain.o

2
drivers/firmware/arm_scmi/base.c
View File

@ -204,7 +204,7 @@ static int scmi_base_discover_agent_get(const struct scmi_handle *handle,
if (ret)
return ret;
*(__le32 *)t->tx.buf = cpu_to_le32(id);
put_unaligned_le32(id, t->tx.buf);
ret = scmi_do_xfer(handle, t);
if (!ret)

33
drivers/firmware/arm_scmi/clock.c
View File

@ -56,7 +56,7 @@ struct scmi_msg_resp_clock_describe_rates {
struct scmi_clock_set_rate {
__le32 flags;
#define CLOCK_SET_ASYNC BIT(0)
#define CLOCK_SET_DELAYED BIT(1)
#define CLOCK_SET_IGNORE_RESP BIT(1)
#define CLOCK_SET_ROUND_UP BIT(2)
#define CLOCK_SET_ROUND_AUTO BIT(3)
__le32 id;
@ -67,6 +67,7 @@ struct scmi_clock_set_rate {
struct clock_info {
int num_clocks;
int max_async_req;
atomic_t cur_async_req;
struct scmi_clock_info *clk;
};
@ -106,7 +107,7 @@ static int scmi_clock_attributes_get(const struct scmi_handle *handle,
if (ret)
return ret;
*(__le32 *)t->tx.buf = cpu_to_le32(clk_id);
put_unaligned_le32(clk_id, t->tx.buf);
attr = t->rx.buf;
ret = scmi_do_xfer(handle, t);
@ -203,39 +204,47 @@ scmi_clock_rate_get(const struct scmi_handle *handle, u32 clk_id, u64 *value)
if (ret)
return ret;
*(__le32 *)t->tx.buf = cpu_to_le32(clk_id);
put_unaligned_le32(clk_id, t->tx.buf);
ret = scmi_do_xfer(handle, t);
if (!ret) {
__le32 *pval = t->rx.buf;
*value = le32_to_cpu(*pval);
*value |= (u64)le32_to_cpu(*(pval + 1)) << 32;
}
if (!ret)
*value = get_unaligned_le64(t->rx.buf);
scmi_xfer_put(handle, t);
return ret;
}
static int scmi_clock_rate_set(const struct scmi_handle *handle, u32 clk_id,
u32 config, u64 rate)
u64 rate)
{
int ret;
u32 flags = 0;
struct scmi_xfer *t;
struct scmi_clock_set_rate *cfg;
struct clock_info *ci = handle->clk_priv;
ret = scmi_xfer_get_init(handle, CLOCK_RATE_SET, SCMI_PROTOCOL_CLOCK,
sizeof(*cfg), 0, &t);
if (ret)
return ret;
if (ci->max_async_req &&
atomic_inc_return(&ci->cur_async_req) < ci->max_async_req)
flags |= CLOCK_SET_ASYNC;
cfg = t->tx.buf;
cfg->flags = cpu_to_le32(config);
cfg->flags = cpu_to_le32(flags);
cfg->id = cpu_to_le32(clk_id);
cfg->value_low = cpu_to_le32(rate & 0xffffffff);
cfg->value_high = cpu_to_le32(rate >> 32);
ret = scmi_do_xfer(handle, t);
if (flags & CLOCK_SET_ASYNC)
ret = scmi_do_xfer_with_response(handle, t);
else
ret = scmi_do_xfer(handle, t);
if (ci->max_async_req)
atomic_dec(&ci->cur_async_req);
scmi_xfer_put(handle, t);
return ret;

18
drivers/firmware/arm_scmi/common.h
View File

@ -15,6 +15,8 @@
#include <linux/scmi_protocol.h>
#include <linux/types.h>
#include <asm/unaligned.h>
#define PROTOCOL_REV_MINOR_MASK GENMASK(15, 0)
#define PROTOCOL_REV_MAJOR_MASK GENMASK(31, 16)
#define PROTOCOL_REV_MAJOR(x) (u16)(FIELD_GET(PROTOCOL_REV_MAJOR_MASK, (x)))
@ -48,11 +50,11 @@ struct scmi_msg_resp_prot_version {
/**
* struct scmi_msg_hdr - Message(Tx/Rx) header
*
* @id: The identifier of the command being sent
* @protocol_id: The identifier of the protocol used to send @id command
* @seq: The token to identify the message. when a message/command returns,
* the platform returns the whole message header unmodified including
* the token
* @id: The identifier of the message being sent
* @protocol_id: The identifier of the protocol used to send @id message
* @seq: The token to identify the message. When a message returns, the
* platform returns the whole message header unmodified including the
* token
* @status: Status of the transfer once it's complete
* @poll_completion: Indicate if the transfer needs to be polled for
* completion or interrupt mode is used
@ -84,17 +86,21 @@ struct scmi_msg {
* @rx: Receive message, the buffer should be pre-allocated to store
* message. If request-ACK protocol is used, we can reuse the same
* buffer for the rx path as we use for the tx path.
* @done: completion event
* @done: command message transmit completion event
* @async: pointer to delayed response message received event completion
*/
struct scmi_xfer {
struct scmi_msg_hdr hdr;
struct scmi_msg tx;
struct scmi_msg rx;
struct completion done;
struct completion *async_done;
};
void scmi_xfer_put(const struct scmi_handle *h, struct scmi_xfer *xfer);
int scmi_do_xfer(const struct scmi_handle *h, struct scmi_xfer *xfer);
int scmi_do_xfer_with_response(const struct scmi_handle *h,
struct scmi_xfer *xfer);
int scmi_xfer_get_init(const struct scmi_handle *h, u8 msg_id, u8 prot_id,
size_t tx_size, size_t rx_size, struct scmi_xfer **p);
int scmi_handle_put(const struct scmi_handle *handle);

568
drivers/firmware/arm_scmi/driver.c
View File

@ -30,8 +30,14 @@
#include "common.h"
#define MSG_ID_MASK GENMASK(7, 0)
#define MSG_XTRACT_ID(hdr) FIELD_GET(MSG_ID_MASK, (hdr))
#define MSG_TYPE_MASK GENMASK(9, 8)
#define MSG_XTRACT_TYPE(hdr) FIELD_GET(MSG_TYPE_MASK, (hdr))
#define MSG_TYPE_COMMAND 0
#define MSG_TYPE_DELAYED_RESP 2
#define MSG_TYPE_NOTIFICATION 3
#define MSG_PROTOCOL_ID_MASK GENMASK(17, 10)
#define MSG_XTRACT_PROT_ID(hdr) FIELD_GET(MSG_PROTOCOL_ID_MASK, (hdr))
#define MSG_TOKEN_ID_MASK GENMASK(27, 18)
#define MSG_XTRACT_TOKEN(hdr) FIELD_GET(MSG_TOKEN_ID_MASK, (hdr))
#define MSG_TOKEN_MAX (MSG_XTRACT_TOKEN(MSG_TOKEN_ID_MASK) + 1)
@ -86,7 +92,7 @@ struct scmi_desc {
};
/**
* struct scmi_chan_info - Structure representing a SCMI channel informfation
* struct scmi_chan_info - Structure representing a SCMI channel information
*
* @cl: Mailbox Client
* @chan: Transmit/Receive mailbox channel
@ -111,8 +117,9 @@ struct scmi_chan_info {
* @handle: Instance of SCMI handle to send to clients
* @version: SCMI revision information containing protocol version,
* implementation version and (sub-)vendor identification.
* @minfo: Message info
* @tx_idr: IDR object to map protocol id to channel info pointer
* @tx_minfo: Universal Transmit Message management info
* @tx_idr: IDR object to map protocol id to Tx channel info pointer
* @rx_idr: IDR object to map protocol id to Rx channel info pointer
* @protocols_imp: List of protocols implemented, currently maximum of
* MAX_PROTOCOLS_IMP elements allocated by the base protocol
* @node: List head
@ -123,8 +130,9 @@ struct scmi_info {
const struct scmi_desc *desc;
struct scmi_revision_info version;
struct scmi_handle handle;
struct scmi_xfers_info minfo;
struct scmi_xfers_info tx_minfo;
struct idr tx_idr;
struct idr rx_idr;
u8 *protocols_imp;
struct list_head node;
int users;
@ -182,7 +190,7 @@ static inline int scmi_to_linux_errno(int errno)
static inline void scmi_dump_header_dbg(struct device *dev,
struct scmi_msg_hdr *hdr)
{
dev_dbg(dev, "Command ID: %x Sequence ID: %x Protocol: %x\n",
dev_dbg(dev, "Message ID: %x Sequence ID: %x Protocol: %x\n",
hdr->id, hdr->seq, hdr->protocol_id);
}
@ -190,64 +198,20 @@ static void scmi_fetch_response(struct scmi_xfer *xfer,
struct scmi_shared_mem __iomem *mem)
{
xfer->hdr.status = ioread32(mem->msg_payload);
/* Skip the length of header and statues in payload area i.e 8 bytes*/
/* Skip the length of header and status in payload area i.e 8 bytes */
xfer->rx.len = min_t(size_t, xfer->rx.len, ioread32(&mem->length) - 8);
/* Take a copy to the rx buffer.. */
memcpy_fromio(xfer->rx.buf, mem->msg_payload + 4, xfer->rx.len);
}
/**
* scmi_rx_callback() - mailbox client callback for receive messages
*
* @cl: client pointer
* @m: mailbox message
*
* Processes one received message to appropriate transfer information and
* signals completion of the transfer.
*
* NOTE: This function will be invoked in IRQ context, hence should be
* as optimal as possible.
*/
static void scmi_rx_callback(struct mbox_client *cl, void *m)
{
u16 xfer_id;
struct scmi_xfer *xfer;
struct scmi_chan_info *cinfo = client_to_scmi_chan_info(cl);
struct device *dev = cinfo->dev;
struct scmi_info *info = handle_to_scmi_info(cinfo->handle);
struct scmi_xfers_info *minfo = &info->minfo;
struct scmi_shared_mem __iomem *mem = cinfo->payload;
xfer_id = MSG_XTRACT_TOKEN(ioread32(&mem->msg_header));
/* Are we even expecting this? */
if (!test_bit(xfer_id, minfo->xfer_alloc_table)) {
dev_err(dev, "message for %d is not expected!\n", xfer_id);
return;
}
xfer = &minfo->xfer_block[xfer_id];
scmi_dump_header_dbg(dev, &xfer->hdr);
/* Is the message of valid length? */
if (xfer->rx.len > info->desc->max_msg_size) {
dev_err(dev, "unable to handle %zu xfer(max %d)\n",
xfer->rx.len, info->desc->max_msg_size);
return;
}
scmi_fetch_response(xfer, mem);
complete(&xfer->done);
}
/**
* pack_scmi_header() - packs and returns 32-bit header
*
* @hdr: pointer to header containing all the information on message id,
* protocol id and sequence id.
*
* Return: 32-bit packed command header to be sent to the platform.
* Return: 32-bit packed message header to be sent to the platform.
*/
static inline u32 pack_scmi_header(struct scmi_msg_hdr *hdr)
{
@ -256,6 +220,18 @@ static inline u32 pack_scmi_header(struct scmi_msg_hdr *hdr)
FIELD_PREP(MSG_PROTOCOL_ID_MASK, hdr->protocol_id);
}
/**
* unpack_scmi_header() - unpacks and records message and protocol id
*
* @msg_hdr: 32-bit packed message header sent from the platform
* @hdr: pointer to header to fetch message and protocol id.
*/
static inline void unpack_scmi_header(u32 msg_hdr, struct scmi_msg_hdr *hdr)
{
hdr->id = MSG_XTRACT_ID(msg_hdr);
hdr->protocol_id = MSG_XTRACT_PROT_ID(msg_hdr);
}
/**
* scmi_tx_prepare() - mailbox client callback to prepare for the transfer
*
@ -271,6 +247,14 @@ static void scmi_tx_prepare(struct mbox_client *cl, void *m)
struct scmi_chan_info *cinfo = client_to_scmi_chan_info(cl);
struct scmi_shared_mem __iomem *mem = cinfo->payload;
/*
* Ideally channel must be free by now unless OS timeout last
* request and platform continued to process the same, wait
* until it releases the shared memory, otherwise we may endup
* overwriting its response with new message payload or vice-versa
*/
spin_until_cond(ioread32(&mem->channel_status) &
SCMI_SHMEM_CHAN_STAT_CHANNEL_FREE);
/* Mark channel busy + clear error */
iowrite32(0x0, &mem->channel_status);
iowrite32(t->hdr.poll_completion ? 0 : SCMI_SHMEM_FLAG_INTR_ENABLED,
@ -285,8 +269,9 @@ static void scmi_tx_prepare(struct mbox_client *cl, void *m)
* scmi_xfer_get() - Allocate one message
*
* @handle: Pointer to SCMI entity handle
* @minfo: Pointer to Tx/Rx Message management info based on channel type
*
* Helper function which is used by various command functions that are
* Helper function which is used by various message functions that are
* exposed to clients of this driver for allocating a message traffic event.
*
* This function can sleep depending on pending requests already in the system
@ -295,13 +280,13 @@ static void scmi_tx_prepare(struct mbox_client *cl, void *m)
*
* Return: 0 if all went fine, else corresponding error.
*/
static struct scmi_xfer *scmi_xfer_get(const struct scmi_handle *handle)
static struct scmi_xfer *scmi_xfer_get(const struct scmi_handle *handle,
struct scmi_xfers_info *minfo)
{
u16 xfer_id;
struct scmi_xfer *xfer;
unsigned long flags, bit_pos;
struct scmi_info *info = handle_to_scmi_info(handle);
struct scmi_xfers_info *minfo = &info->minfo;
/* Keep the locked section as small as possible */
spin_lock_irqsave(&minfo->xfer_lock, flags);
@ -324,18 +309,17 @@ static struct scmi_xfer *scmi_xfer_get(const struct scmi_handle *handle)
}
/**
* scmi_xfer_put() - Release a message
* __scmi_xfer_put() - Release a message
*
* @handle: Pointer to SCMI entity handle
* @minfo: Pointer to Tx/Rx Message management info based on channel type
* @xfer: message that was reserved by scmi_xfer_get
*
* This holds a spinlock to maintain integrity of internal data structures.
*/
void scmi_xfer_put(const struct scmi_handle *handle, struct scmi_xfer *xfer)
static void
__scmi_xfer_put(struct scmi_xfers_info *minfo, struct scmi_xfer *xfer)
{
unsigned long flags;
struct scmi_info *info = handle_to_scmi_info(handle);
struct scmi_xfers_info *minfo = &info->minfo;
/*
* Keep the locked section as small as possible
@ -347,6 +331,68 @@ void scmi_xfer_put(const struct scmi_handle *handle, struct scmi_xfer *xfer)
spin_unlock_irqrestore(&minfo->xfer_lock, flags);
}
/**
* scmi_rx_callback() - mailbox client callback for receive messages
*
* @cl: client pointer
* @m: mailbox message
*
* Processes one received message to appropriate transfer information and
* signals completion of the transfer.
*
* NOTE: This function will be invoked in IRQ context, hence should be
* as optimal as possible.
*/
static void scmi_rx_callback(struct mbox_client *cl, void *m)
{
u8 msg_type;
u32 msg_hdr;
u16 xfer_id;
struct scmi_xfer *xfer;
struct scmi_chan_info *cinfo = client_to_scmi_chan_info(cl);
struct device *dev = cinfo->dev;
struct scmi_info *info = handle_to_scmi_info(cinfo->handle);
struct scmi_xfers_info *minfo = &info->tx_minfo;
struct scmi_shared_mem __iomem *mem = cinfo->payload;
msg_hdr = ioread32(&mem->msg_header);
msg_type = MSG_XTRACT_TYPE(msg_hdr);
xfer_id = MSG_XTRACT_TOKEN(msg_hdr);
if (msg_type == MSG_TYPE_NOTIFICATION)
return; /* Notifications not yet supported */
/* Are we even expecting this? */
if (!test_bit(xfer_id, minfo->xfer_alloc_table)) {
dev_err(dev, "message for %d is not expected!\n", xfer_id);
return;
}
xfer = &minfo->xfer_block[xfer_id];
scmi_dump_header_dbg(dev, &xfer->hdr);
scmi_fetch_response(xfer, mem);
if (msg_type == MSG_TYPE_DELAYED_RESP)
complete(xfer->async_done);
else
complete(&xfer->done);
}
/**
* scmi_xfer_put() - Release a transmit message
*
* @handle: Pointer to SCMI entity handle
* @xfer: message that was reserved by scmi_xfer_get
*/
void scmi_xfer_put(const struct scmi_handle *handle, struct scmi_xfer *xfer)
{
struct scmi_info *info = handle_to_scmi_info(handle);
__scmi_xfer_put(&info->tx_minfo, xfer);
}
static bool
scmi_xfer_poll_done(const struct scmi_chan_info *cinfo, struct scmi_xfer *xfer)
{
@ -435,8 +481,36 @@ int scmi_do_xfer(const struct scmi_handle *handle, struct scmi_xfer *xfer)
return ret;
}
#define SCMI_MAX_RESPONSE_TIMEOUT (2 * MSEC_PER_SEC)
/**
* scmi_xfer_get_init() - Allocate and initialise one message
* scmi_do_xfer_with_response() - Do one transfer and wait until the delayed
* response is received
*
* @handle: Pointer to SCMI entity handle
* @xfer: Transfer to initiate and wait for response
*
* Return: -ETIMEDOUT in case of no delayed response, if transmit error,
* return corresponding error, else if all goes well, return 0.
*/
int scmi_do_xfer_with_response(const struct scmi_handle *handle,
struct scmi_xfer *xfer)
{
int ret, timeout = msecs_to_jiffies(SCMI_MAX_RESPONSE_TIMEOUT);
DECLARE_COMPLETION_ONSTACK(async_response);
xfer->async_done = &async_response;
ret = scmi_do_xfer(handle, xfer);
if (!ret && !wait_for_completion_timeout(xfer->async_done, timeout))
ret = -ETIMEDOUT;
xfer->async_done = NULL;
return ret;
}
/**
* scmi_xfer_get_init() - Allocate and initialise one message for transmit
*
* @handle: Pointer to SCMI entity handle
* @msg_id: Message identifier
@ -457,6 +531,7 @@ int scmi_xfer_get_init(const struct scmi_handle *handle, u8 msg_id, u8 prot_id,
int ret;
struct scmi_xfer *xfer;
struct scmi_info *info = handle_to_scmi_info(handle);
struct scmi_xfers_info *minfo = &info->tx_minfo;
struct device *dev = info->dev;
/* Ensure we have sane transfer sizes */
@ -464,7 +539,7 @@ int scmi_xfer_get_init(const struct scmi_handle *handle, u8 msg_id, u8 prot_id,
tx_size > info->desc->max_msg_size)
return -ERANGE;
xfer = scmi_xfer_get(handle);
xfer = scmi_xfer_get(handle, minfo);
if (IS_ERR(xfer)) {
ret = PTR_ERR(xfer);
dev_err(dev, "failed to get free message slot(%d)\n", ret);
@ -597,27 +672,13 @@ int scmi_handle_put(const struct scmi_handle *handle)
return 0;
}
static const struct scmi_desc scmi_generic_desc = {
.max_rx_timeout_ms = 30, /* We may increase this if required */
.max_msg = 20, /* Limited by MBOX_TX_QUEUE_LEN */
.max_msg_size = 128,
};
/* Each compatible listed below must have descriptor associated with it */
static const struct of_device_id scmi_of_match[] = {
{ .compatible = "arm,scmi", .data = &scmi_generic_desc },
{ /* Sentinel */ },
};
MODULE_DEVICE_TABLE(of, scmi_of_match);
static int scmi_xfer_info_init(struct scmi_info *sinfo)
{
int i;
struct scmi_xfer *xfer;
struct device *dev = sinfo->dev;
const struct scmi_desc *desc = sinfo->desc;
struct scmi_xfers_info *info = &sinfo->minfo;
struct scmi_xfers_info *info = &sinfo->tx_minfo;
/* Pre-allocated messages, no more than what hdr.seq can support */
if (WARN_ON(desc->max_msg >= MSG_TOKEN_MAX)) {
@ -652,9 +713,189 @@ static int scmi_xfer_info_init(struct scmi_info *sinfo)
return 0;
}
static int scmi_mailbox_check(struct device_node *np)
static int scmi_mailbox_check(struct device_node *np, int idx)
{
return of_parse_phandle_with_args(np, "mboxes", "#mbox-cells", 0, NULL);
return of_parse_phandle_with_args(np, "mboxes", "#mbox-cells",
idx, NULL);
}
static int scmi_mbox_chan_setup(struct scmi_info *info, struct device *dev,
int prot_id, bool tx)
{
int ret, idx;
struct resource res;
resource_size_t size;
struct device_node *shmem, *np = dev->of_node;
struct scmi_chan_info *cinfo;
struct mbox_client *cl;
struct idr *idr;
const char *desc = tx ? "Tx" : "Rx";
/* Transmit channel is first entry i.e. index 0 */
idx = tx ? 0 : 1;
idr = tx ? &info->tx_idr : &info->rx_idr;
if (scmi_mailbox_check(np, idx)) {
cinfo = idr_find(idr, SCMI_PROTOCOL_BASE);
if (unlikely(!cinfo)) /* Possible only if platform has no Rx */
return -EINVAL;
goto idr_alloc;
}
cinfo = devm_kzalloc(info->dev, sizeof(*cinfo), GFP_KERNEL);
if (!cinfo)
return -ENOMEM;
cinfo->dev = dev;
cl = &cinfo->cl;
cl->dev = dev;
cl->rx_callback = scmi_rx_callback;
cl->tx_prepare = tx ? scmi_tx_prepare : NULL;
cl->tx_block = false;
cl->knows_txdone = tx;
shmem = of_parse_phandle(np, "shmem", idx);
ret = of_address_to_resource(shmem, 0, &res);
of_node_put(shmem);
if (ret) {
dev_err(dev, "failed to get SCMI %s payload memory\n", desc);
return ret;
}
size = resource_size(&res);
cinfo->payload = devm_ioremap(info->dev, res.start, size);
if (!cinfo->payload) {
dev_err(dev, "failed to ioremap SCMI %s payload\n", desc);
return -EADDRNOTAVAIL;
}
cinfo->chan = mbox_request_channel(cl, idx);
if (IS_ERR(cinfo->chan)) {
ret = PTR_ERR(cinfo->chan);
if (ret != -EPROBE_DEFER)
dev_err(dev, "failed to request SCMI %s mailbox\n",
desc);
return ret;
}
idr_alloc:
ret = idr_alloc(idr, cinfo, prot_id, prot_id + 1, GFP_KERNEL);
if (ret != prot_id) {
dev_err(dev, "unable to allocate SCMI idr slot err %d\n", ret);
return ret;
}
cinfo->handle = &info->handle;
return 0;
}
static inline int
scmi_mbox_txrx_setup(struct scmi_info *info, struct device *dev, int prot_id)
{
int ret = scmi_mbox_chan_setup(info, dev, prot_id, true);
if (!ret) /* Rx is optional, hence no error check */
scmi_mbox_chan_setup(info, dev, prot_id, false);
return ret;
}
static inline void
scmi_create_protocol_device(struct device_node *np, struct scmi_info *info,
int prot_id)
{
struct scmi_device *sdev;
sdev = scmi_device_create(np, info->dev, prot_id);
if (!sdev) {
dev_err(info->dev, "failed to create %d protocol device\n",
prot_id);
return;
}
if (scmi_mbox_txrx_setup(info, &sdev->dev, prot_id)) {
dev_err(&sdev->dev, "failed to setup transport\n");
scmi_device_destroy(sdev);
return;
}
/* setup handle now as the transport is ready */
scmi_set_handle(sdev);
}
static int scmi_probe(struct platform_device *pdev)
{
int ret;
struct scmi_handle *handle;
const struct scmi_desc *desc;
struct scmi_info *info;
struct device *dev = &pdev->dev;
struct device_node *child, *np = dev->of_node;
/* Only mailbox method supported, check for the presence of one */
if (scmi_mailbox_check(np, 0)) {
dev_err(dev, "no mailbox found in %pOF\n", np);
return -EINVAL;
}
desc = of_device_get_match_data(dev);
if (!desc)
return -EINVAL;
info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
info->dev = dev;
info->desc = desc;
INIT_LIST_HEAD(&info->node);
ret = scmi_xfer_info_init(info);
if (ret)
return ret;
platform_set_drvdata(pdev, info);
idr_init(&info->tx_idr);
idr_init(&info->rx_idr);
handle = &info->handle;
handle->dev = info->dev;
handle->version = &info->version;
ret = scmi_mbox_txrx_setup(info, dev, SCMI_PROTOCOL_BASE);
if (ret)
return ret;
ret = scmi_base_protocol_init(handle);
if (ret) {
dev_err(dev, "unable to communicate with SCMI(%d)\n", ret);
return ret;
}
mutex_lock(&scmi_list_mutex);
list_add_tail(&info->node, &scmi_list);
mutex_unlock(&scmi_list_mutex);
for_each_available_child_of_node(np, child) {
u32 prot_id;
if (of_property_read_u32(child, "reg", &prot_id))
continue;
if (!FIELD_FIT(MSG_PROTOCOL_ID_MASK, prot_id))
dev_err(dev, "Out of range protocol %d\n", prot_id);
if (!scmi_is_protocol_implemented(handle, prot_id)) {
dev_err(dev, "SCMI protocol %d not implemented\n",
prot_id);
continue;
}
scmi_create_protocol_device(child, info, prot_id);
}
return 0;
}
static int scmi_mbox_free_channel(int id, void *p, void *data)
@ -692,167 +933,26 @@ static int scmi_remove(struct platform_device *pdev)
ret = idr_for_each(idr, scmi_mbox_free_channel, idr);
idr_destroy(&info->tx_idr);
idr = &info->rx_idr;
ret = idr_for_each(idr, scmi_mbox_free_channel, idr);
idr_destroy(&info->rx_idr);
return ret;
}
static inline int
scmi_mbox_chan_setup(struct scmi_info *info, struct device *dev, int prot_id)
{
int ret;
struct resource res;
resource_size_t size;
struct device_node *shmem, *np = dev->of_node;
struct scmi_chan_info *cinfo;
struct mbox_client *cl;
static const struct scmi_desc scmi_generic_desc = {
.max_rx_timeout_ms = 30, /* We may increase this if required */
.max_msg = 20, /* Limited by MBOX_TX_QUEUE_LEN */
.max_msg_size = 128,
};
if (scmi_mailbox_check(np)) {
cinfo = idr_find(&info->tx_idr, SCMI_PROTOCOL_BASE);
goto idr_alloc;
}
/* Each compatible listed below must have descriptor associated with it */
static const struct of_device_id scmi_of_match[] = {
{ .compatible = "arm,scmi", .data = &scmi_generic_desc },
{ /* Sentinel */ },
};
cinfo = devm_kzalloc(info->dev, sizeof(*cinfo), GFP_KERNEL);
if (!cinfo)
return -ENOMEM;
cinfo->dev = dev;
cl = &cinfo->cl;
cl->dev = dev;
cl->rx_callback = scmi_rx_callback;
cl->tx_prepare = scmi_tx_prepare;
cl->tx_block = false;
cl->knows_txdone = true;
shmem = of_parse_phandle(np, "shmem", 0);
ret = of_address_to_resource(shmem, 0, &res);
of_node_put(shmem);
if (ret) {
dev_err(dev, "failed to get SCMI Tx payload mem resource\n");
return ret;
}
size = resource_size(&res);
cinfo->payload = devm_ioremap(info->dev, res.start, size);
if (!cinfo->payload) {
dev_err(dev, "failed to ioremap SCMI Tx payload\n");
return -EADDRNOTAVAIL;
}
/* Transmit channel is first entry i.e. index 0 */
cinfo->chan = mbox_request_channel(cl, 0);
if (IS_ERR(cinfo->chan)) {
ret = PTR_ERR(cinfo->chan);
if (ret != -EPROBE_DEFER)
dev_err(dev, "failed to request SCMI Tx mailbox\n");
return ret;
}
idr_alloc:
ret = idr_alloc(&info->tx_idr, cinfo, prot_id, prot_id + 1, GFP_KERNEL);
if (ret != prot_id) {
dev_err(dev, "unable to allocate SCMI idr slot err %d\n", ret);
return ret;
}
cinfo->handle = &info->handle;
return 0;
}
static inline void
scmi_create_protocol_device(struct device_node *np, struct scmi_info *info,
int prot_id)
{
struct scmi_device *sdev;
sdev = scmi_device_create(np, info->dev, prot_id);
if (!sdev) {
dev_err(info->dev, "failed to create %d protocol device\n",
prot_id);
return;
}
if (scmi_mbox_chan_setup(info, &sdev->dev, prot_id)) {
dev_err(&sdev->dev, "failed to setup transport\n");
scmi_device_destroy(sdev);
return;
}
/* setup handle now as the transport is ready */
scmi_set_handle(sdev);
}
static int scmi_probe(struct platform_device *pdev)
{
int ret;
struct scmi_handle *handle;
const struct scmi_desc *desc;
struct scmi_info *info;
struct device *dev = &pdev->dev;
struct device_node *child, *np = dev->of_node;
/* Only mailbox method supported, check for the presence of one */
if (scmi_mailbox_check(np)) {
dev_err(dev, "no mailbox found in %pOF\n", np);
return -EINVAL;
}
desc = of_device_get_match_data(dev);
if (!desc)
return -EINVAL;
info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
info->dev = dev;
info->desc = desc;
INIT_LIST_HEAD(&info->node);
ret = scmi_xfer_info_init(info);
if (ret)
return ret;
platform_set_drvdata(pdev, info);
idr_init(&info->tx_idr);
handle = &info->handle;
handle->dev = info->dev;
handle->version = &info->version;
ret = scmi_mbox_chan_setup(info, dev, SCMI_PROTOCOL_BASE);
if (ret)
return ret;
ret = scmi_base_protocol_init(handle);
if (ret) {
dev_err(dev, "unable to communicate with SCMI(%d)\n", ret);
return ret;
}
mutex_lock(&scmi_list_mutex);
list_add_tail(&info->node, &scmi_list);
mutex_unlock(&scmi_list_mutex);
for_each_available_child_of_node(np, child) {
u32 prot_id;
if (of_property_read_u32(child, "reg", &prot_id))
continue;
if (!FIELD_FIT(MSG_PROTOCOL_ID_MASK, prot_id))
dev_err(dev, "Out of range protocol %d\n", prot_id);
if (!scmi_is_protocol_implemented(handle, prot_id)) {
dev_err(dev, "SCMI protocol %d not implemented\n",
prot_id);
continue;
}
scmi_create_protocol_device(child, info, prot_id);
}
return 0;
}
MODULE_DEVICE_TABLE(of, scmi_of_match);
static struct platform_driver scmi_driver = {
.driver = {

264
drivers/firmware/arm_scmi/perf.c
View File

@ -5,7 +5,10 @@
* Copyright (C) 2018 ARM Ltd.
*/
#include <linux/bits.h>
#include <linux/of.h>
#include <linux/io.h>
#include <linux/io-64-nonatomic-hi-lo.h>
#include <linux/platform_device.h>
#include <linux/pm_opp.h>
#include <linux/sort.h>
@ -21,6 +24,7 @@ enum scmi_performance_protocol_cmd {
PERF_LEVEL_GET = 0x8,
PERF_NOTIFY_LIMITS = 0x9,
PERF_NOTIFY_LEVEL = 0xa,
PERF_DESCRIBE_FASTCHANNEL = 0xb,
};
struct scmi_opp {
@ -44,6 +48,7 @@ struct scmi_msg_resp_perf_domain_attributes {
#define SUPPORTS_SET_PERF_LVL(x) ((x) & BIT(30))
#define SUPPORTS_PERF_LIMIT_NOTIFY(x) ((x) & BIT(29))
#define SUPPORTS_PERF_LEVEL_NOTIFY(x) ((x) & BIT(28))
#define SUPPORTS_PERF_FASTCHANNELS(x) ((x) & BIT(27))
__le32 rate_limit_us;
__le32 sustained_freq_khz;
__le32 sustained_perf_level;
@ -87,17 +92,56 @@ struct scmi_msg_resp_perf_describe_levels {
} opp[0];
};
struct scmi_perf_get_fc_info {
__le32 domain;
__le32 message_id;
};
struct scmi_msg_resp_perf_desc_fc {
__le32 attr;
#define SUPPORTS_DOORBELL(x) ((x) & BIT(0))
#define DOORBELL_REG_WIDTH(x) FIELD_GET(GENMASK(2, 1), (x))
__le32 rate_limit;
__le32 chan_addr_low;
__le32 chan_addr_high;
__le32 chan_size;
__le32 db_addr_low;
__le32 db_addr_high;
__le32 db_set_lmask;
__le32 db_set_hmask;
__le32 db_preserve_lmask;
__le32 db_preserve_hmask;
};
struct scmi_fc_db_info {
int width;
u64 set;
u64 mask;
void __iomem *addr;
};
struct scmi_fc_info {
void __iomem *level_set_addr;
void __iomem *limit_set_addr;
void __iomem *level_get_addr;
void __iomem *limit_get_addr;
struct scmi_fc_db_info *level_set_db;
struct scmi_fc_db_info *limit_set_db;
};
struct perf_dom_info {
bool set_limits;
bool set_perf;
bool perf_limit_notify;
bool perf_level_notify;
bool perf_fastchannels;
u32 opp_count;
u32 sustained_freq_khz;
u32 sustained_perf_level;
u32 mult_factor;
char name[SCMI_MAX_STR_SIZE];
struct scmi_opp opp[MAX_OPPS];
struct scmi_fc_info *fc_info;
};
struct scmi_perf_info {
@ -151,7 +195,7 @@ scmi_perf_domain_attributes_get(const struct scmi_handle *handle, u32 domain,
if (ret)
return ret;
*(__le32 *)t->tx.buf = cpu_to_le32(domain);
put_unaligned_le32(domain, t->tx.buf);
attr = t->rx.buf;
ret = scmi_do_xfer(handle, t);
@ -162,6 +206,7 @@ scmi_perf_domain_attributes_get(const struct scmi_handle *handle, u32 domain,
dom_info->set_perf = SUPPORTS_SET_PERF_LVL(flags);
dom_info->perf_limit_notify = SUPPORTS_PERF_LIMIT_NOTIFY(flags);
dom_info->perf_level_notify = SUPPORTS_PERF_LEVEL_NOTIFY(flags);
dom_info->perf_fastchannels = SUPPORTS_PERF_FASTCHANNELS(flags);
dom_info->sustained_freq_khz =
le32_to_cpu(attr->sustained_freq_khz);
dom_info->sustained_perf_level =
@ -249,8 +294,42 @@ scmi_perf_describe_levels_get(const struct scmi_handle *handle, u32 domain,
return ret;
}
static int scmi_perf_limits_set(const struct scmi_handle *handle, u32 domain,
u32 max_perf, u32 min_perf)
#define SCMI_PERF_FC_RING_DB(w) \
do { \
u##w val = 0; \
\
if (db->mask) \
val = ioread##w(db->addr) & db->mask; \
iowrite##w((u##w)db->set | val, db->addr); \
} while (0)
static void scmi_perf_fc_ring_db(struct scmi_fc_db_info *db)
{
if (!db || !db->addr)
return;
if (db->width == 1)
SCMI_PERF_FC_RING_DB(8);
else if (db->width == 2)
SCMI_PERF_FC_RING_DB(16);
else if (db->width == 4)
SCMI_PERF_FC_RING_DB(32);
else /* db->width == 8 */
#ifdef CONFIG_64BIT
SCMI_PERF_FC_RING_DB(64);
#else
{
u64 val = 0;
if (db->mask)
val = ioread64_hi_lo(db->addr) & db->mask;
iowrite64_hi_lo(db->set, db->addr);
}
#endif
}
static int scmi_perf_mb_limits_set(const struct scmi_handle *handle, u32 domain,
u32 max_perf, u32 min_perf)
{
int ret;
struct scmi_xfer *t;
@ -272,8 +351,24 @@ static int scmi_perf_limits_set(const struct scmi_handle *handle, u32 domain,
return ret;
}
static int scmi_perf_limits_get(const struct scmi_handle *handle, u32 domain,
u32 *max_perf, u32 *min_perf)
static int scmi_perf_limits_set(const struct scmi_handle *handle, u32 domain,
u32 max_perf, u32 min_perf)
{
struct scmi_perf_info *pi = handle->perf_priv;
struct perf_dom_info *dom = pi->dom_info + domain;
if (dom->fc_info && dom->fc_info->limit_set_addr) {
iowrite32(max_perf, dom->fc_info->limit_set_addr);
iowrite32(min_perf, dom->fc_info->limit_set_addr + 4);
scmi_perf_fc_ring_db(dom->fc_info->limit_set_db);
return 0;
}
return scmi_perf_mb_limits_set(handle, domain, max_perf, min_perf);
}
static int scmi_perf_mb_limits_get(const struct scmi_handle *handle, u32 domain,
u32 *max_perf, u32 *min_perf)
{
int ret;
struct scmi_xfer *t;
@ -284,7 +379,7 @@ static int scmi_perf_limits_get(const struct scmi_handle *handle, u32 domain,
if (ret)
return ret;
*(__le32 *)t->tx.buf = cpu_to_le32(domain);
put_unaligned_le32(domain, t->tx.buf);
ret = scmi_do_xfer(handle, t);
if (!ret) {
@ -298,8 +393,23 @@ static int scmi_perf_limits_get(const struct scmi_handle *handle, u32 domain,
return ret;
}
static int scmi_perf_level_set(const struct scmi_handle *handle, u32 domain,
u32 level, bool poll)
static int scmi_perf_limits_get(const struct scmi_handle *handle, u32 domain,
u32 *max_perf, u32 *min_perf)
{
struct scmi_perf_info *pi = handle->perf_priv;
struct perf_dom_info *dom = pi->dom_info + domain;
if (dom->fc_info && dom->fc_info->limit_get_addr) {
*max_perf = ioread32(dom->fc_info->limit_get_addr);
*min_perf = ioread32(dom->fc_info->limit_get_addr + 4);
return 0;
}
return scmi_perf_mb_limits_get(handle, domain, max_perf, min_perf);
}
static int scmi_perf_mb_level_set(const struct scmi_handle *handle, u32 domain,
u32 level, bool poll)
{
int ret;
struct scmi_xfer *t;
@ -321,8 +431,23 @@ static int scmi_perf_level_set(const struct scmi_handle *handle, u32 domain,
return ret;
}
static int scmi_perf_level_get(const struct scmi_handle *handle, u32 domain,
u32 *level, bool poll)
static int scmi_perf_level_set(const struct scmi_handle *handle, u32 domain,
u32 level, bool poll)
{
struct scmi_perf_info *pi = handle->perf_priv;
struct perf_dom_info *dom = pi->dom_info + domain;
if (dom->fc_info && dom->fc_info->level_set_addr) {
iowrite32(level, dom->fc_info->level_set_addr);
scmi_perf_fc_ring_db(dom->fc_info->level_set_db);
return 0;
}
return scmi_perf_mb_level_set(handle, domain, level, poll);
}
static int scmi_perf_mb_level_get(const struct scmi_handle *handle, u32 domain,
u32 *level, bool poll)
{
int ret;
struct scmi_xfer *t;
@ -333,16 +458,128 @@ static int scmi_perf_level_get(const struct scmi_handle *handle, u32 domain,
return ret;
t->hdr.poll_completion = poll;
*(__le32 *)t->tx.buf = cpu_to_le32(domain);
put_unaligned_le32(domain, t->tx.buf);
ret = scmi_do_xfer(handle, t);
if (!ret)
*level = le32_to_cpu(*(__le32 *)t->rx.buf);
*level = get_unaligned_le32(t->rx.buf);
scmi_xfer_put(handle, t);
return ret;
}
static int scmi_perf_level_get(const struct scmi_handle *handle, u32 domain,
u32 *level, bool poll)
{
struct scmi_perf_info *pi = handle->perf_priv;
struct perf_dom_info *dom = pi->dom_info + domain;
if (dom->fc_info && dom->fc_info->level_get_addr) {
*level = ioread32(dom->fc_info->level_get_addr);
return 0;
}
return scmi_perf_mb_level_get(handle, domain, level, poll);
}
static bool scmi_perf_fc_size_is_valid(u32 msg, u32 size)
{
if ((msg == PERF_LEVEL_GET || msg == PERF_LEVEL_SET) && size == 4)
return true;
if ((msg == PERF_LIMITS_GET || msg == PERF_LIMITS_SET) && size == 8)
return true;
return false;
}
static void
scmi_perf_domain_desc_fc(const struct scmi_handle *handle, u32 domain,
u32 message_id, void __iomem **p_addr,
struct scmi_fc_db_info **p_db)
{
int ret;
u32 flags;
u64 phys_addr;
u8 size;
void __iomem *addr;
struct scmi_xfer *t;
struct scmi_fc_db_info *db;
struct scmi_perf_get_fc_info *info;
struct scmi_msg_resp_perf_desc_fc *resp;
if (!p_addr)
return;
ret = scmi_xfer_get_init(handle, PERF_DESCRIBE_FASTCHANNEL,
SCMI_PROTOCOL_PERF,
sizeof(*info), sizeof(*resp), &t);
if (ret)
return;
info = t->tx.buf;
info->domain = cpu_to_le32(domain);
info->message_id = cpu_to_le32(message_id);
ret = scmi_do_xfer(handle, t);
if (ret)
goto err_xfer;
resp = t->rx.buf;
flags = le32_to_cpu(resp->attr);
size = le32_to_cpu(resp->chan_size);
if (!scmi_perf_fc_size_is_valid(message_id, size))
goto err_xfer;
phys_addr = le32_to_cpu(resp->chan_addr_low);
phys_addr |= (u64)le32_to_cpu(resp->chan_addr_high) << 32;
addr = devm_ioremap(handle->dev, phys_addr, size);
if (!addr)
goto err_xfer;
*p_addr = addr;
if (p_db && SUPPORTS_DOORBELL(flags)) {
db = devm_kzalloc(handle->dev, sizeof(*db), GFP_KERNEL);
if (!db)
goto err_xfer;
size = 1 << DOORBELL_REG_WIDTH(flags);
phys_addr = le32_to_cpu(resp->db_addr_low);
phys_addr |= (u64)le32_to_cpu(resp->db_addr_high) << 32;
addr = devm_ioremap(handle->dev, phys_addr, size);
if (!addr)
goto err_xfer;
db->addr = addr;
db->width = size;
db->set = le32_to_cpu(resp->db_set_lmask);
db->set |= (u64)le32_to_cpu(resp->db_set_hmask) << 32;
db->mask = le32_to_cpu(resp->db_preserve_lmask);
db->mask |= (u64)le32_to_cpu(resp->db_preserve_hmask) << 32;
*p_db = db;
}
err_xfer:
scmi_xfer_put(handle, t);
}
static void scmi_perf_domain_init_fc(const struct scmi_handle *handle,
u32 domain, struct scmi_fc_info **p_fc)
{
struct scmi_fc_info *fc;
fc = devm_kzalloc(handle->dev, sizeof(*fc), GFP_KERNEL);
if (!fc)
return;
scmi_perf_domain_desc_fc(handle, domain, PERF_LEVEL_SET,
&fc->level_set_addr, &fc->level_set_db);
scmi_perf_domain_desc_fc(handle, domain, PERF_LEVEL_GET,
&fc->level_get_addr, NULL);
scmi_perf_domain_desc_fc(handle, domain, PERF_LIMITS_SET,
&fc->limit_set_addr, &fc->limit_set_db);
scmi_perf_domain_desc_fc(handle, domain, PERF_LIMITS_GET,
&fc->limit_get_addr, NULL);
*p_fc = fc;
}
/* Device specific ops */
static int scmi_dev_domain_id(struct device *dev)
{
@ -494,6 +731,9 @@ static int scmi_perf_protocol_init(struct scmi_handle *handle)
scmi_perf_domain_attributes_get(handle, domain, dom);
scmi_perf_describe_levels_get(handle, domain, dom);
if (dom->perf_fastchannels)
scmi_perf_domain_init_fc(handle, domain, &dom->fc_info);
}
handle->perf_ops = &perf_ops;

6
drivers/firmware/arm_scmi/power.c
View File

@ -96,7 +96,7 @@ scmi_power_domain_attributes_get(const struct scmi_handle *handle, u32 domain,
if (ret)
return ret;
*(__le32 *)t->tx.buf = cpu_to_le32(domain);
put_unaligned_le32(domain, t->tx.buf);
attr = t->rx.buf;
ret = scmi_do_xfer(handle, t);
@ -147,11 +147,11 @@ scmi_power_state_get(const struct scmi_handle *handle, u32 domain, u32 *state)
if (ret)
return ret;
*(__le32 *)t->tx.buf = cpu_to_le32(domain);
put_unaligned_le32(domain, t->tx.buf);
ret = scmi_do_xfer(handle, t);
if (!ret)
*state = le32_to_cpu(*(__le32 *)t->rx.buf);
*state = get_unaligned_le32(t->rx.buf);
scmi_xfer_put(handle, t);
return ret;

231
drivers/firmware/arm_scmi/reset.c 100644
View File

@ -0,0 +1,231 @@
// SPDX-License-Identifier: GPL-2.0
/*
* System Control and Management Interface (SCMI) Reset Protocol
*
* Copyright (C) 2019 ARM Ltd.
*/
#include "common.h"
enum scmi_reset_protocol_cmd {
RESET_DOMAIN_ATTRIBUTES = 0x3,
RESET = 0x4,
RESET_NOTIFY = 0x5,
};
enum scmi_reset_protocol_notify {
RESET_ISSUED = 0x0,
};
#define NUM_RESET_DOMAIN_MASK 0xffff
#define RESET_NOTIFY_ENABLE BIT(0)
struct scmi_msg_resp_reset_domain_attributes {
__le32 attributes;
#define SUPPORTS_ASYNC_RESET(x) ((x) & BIT(31))
#define SUPPORTS_NOTIFY_RESET(x) ((x) & BIT(30))
__le32 latency;
u8 name[SCMI_MAX_STR_SIZE];
};
struct scmi_msg_reset_domain_reset {
__le32 domain_id;
__le32 flags;
#define AUTONOMOUS_RESET BIT(0)
#define EXPLICIT_RESET_ASSERT BIT(1)
#define ASYNCHRONOUS_RESET BIT(2)
__le32 reset_state;
#define ARCH_RESET_TYPE BIT(31)
#define COLD_RESET_STATE BIT(0)
#define ARCH_COLD_RESET (ARCH_RESET_TYPE | COLD_RESET_STATE)
};
struct reset_dom_info {
bool async_reset;
bool reset_notify;
u32 latency_us;
char name[SCMI_MAX_STR_SIZE];
};
struct scmi_reset_info {
int num_domains;
struct reset_dom_info *dom_info;
};
static int scmi_reset_attributes_get(const struct scmi_handle *handle,
struct scmi_reset_info *pi)
{
int ret;
struct scmi_xfer *t;
u32 attr;
ret = scmi_xfer_get_init(handle, PROTOCOL_ATTRIBUTES,
SCMI_PROTOCOL_RESET, 0, sizeof(attr), &t);
if (ret)
return ret;
ret = scmi_do_xfer(handle, t);
if (!ret) {
attr = get_unaligned_le32(t->rx.buf);
pi->num_domains = attr & NUM_RESET_DOMAIN_MASK;
}
scmi_xfer_put(handle, t);
return ret;
}
static int
scmi_reset_domain_attributes_get(const struct scmi_handle *handle, u32 domain,
struct reset_dom_info *dom_info)
{
int ret;
struct scmi_xfer *t;
struct scmi_msg_resp_reset_domain_attributes *attr;
ret = scmi_xfer_get_init(handle, RESET_DOMAIN_ATTRIBUTES,
SCMI_PROTOCOL_RESET, sizeof(domain),
sizeof(*attr), &t);
if (ret)
return ret;
put_unaligned_le32(domain, t->tx.buf);
attr = t->rx.buf;
ret = scmi_do_xfer(handle, t);
if (!ret) {
u32 attributes = le32_to_cpu(attr->attributes);
dom_info->async_reset = SUPPORTS_ASYNC_RESET(attributes);
dom_info->reset_notify = SUPPORTS_NOTIFY_RESET(attributes);
dom_info->latency_us = le32_to_cpu(attr->latency);
if (dom_info->latency_us == U32_MAX)
dom_info->latency_us = 0;
strlcpy(dom_info->name, attr->name, SCMI_MAX_STR_SIZE);
}
scmi_xfer_put(handle, t);
return ret;
}
static int scmi_reset_num_domains_get(const struct scmi_handle *handle)
{
struct scmi_reset_info *pi = handle->reset_priv;
return pi->num_domains;
}
static char *scmi_reset_name_get(const struct scmi_handle *handle, u32 domain)
{
struct scmi_reset_info *pi = handle->reset_priv;
struct reset_dom_info *dom = pi->dom_info + domain;
return dom->name;
}
static int scmi_reset_latency_get(const struct scmi_handle *handle, u32 domain)
{
struct scmi_reset_info *pi = handle->reset_priv;
struct reset_dom_info *dom = pi->dom_info + domain;
return dom->latency_us;
}
static int scmi_domain_reset(const struct scmi_handle *handle, u32 domain,
u32 flags, u32 state)
{
int ret;
struct scmi_xfer *t;
struct scmi_msg_reset_domain_reset *dom;
struct scmi_reset_info *pi = handle->reset_priv;
struct reset_dom_info *rdom = pi->dom_info + domain;
if (rdom->async_reset)
flags |= ASYNCHRONOUS_RESET;
ret = scmi_xfer_get_init(handle, RESET, SCMI_PROTOCOL_RESET,
sizeof(*dom), 0, &t);
if (ret)
return ret;
dom = t->tx.buf;
dom->domain_id = cpu_to_le32(domain);
dom->flags = cpu_to_le32(flags);
dom->reset_state = cpu_to_le32(state);
if (rdom->async_reset)
ret = scmi_do_xfer_with_response(handle, t);
else
ret = scmi_do_xfer(handle, t);
scmi_xfer_put(handle, t);
return ret;
}
static int scmi_reset_domain_reset(const struct scmi_handle *handle, u32 domain)
{
return scmi_domain_reset(handle, domain, AUTONOMOUS_RESET,
ARCH_COLD_RESET);
}
static int
scmi_reset_domain_assert(const struct scmi_handle *handle, u32 domain)
{
return scmi_domain_reset(handle, domain, EXPLICIT_RESET_ASSERT,
ARCH_COLD_RESET);
}
static int
scmi_reset_domain_deassert(const struct scmi_handle *handle, u32 domain)
{
return scmi_domain_reset(handle, domain, 0, ARCH_COLD_RESET);
}
static struct scmi_reset_ops reset_ops = {
.num_domains_get = scmi_reset_num_domains_get,
.name_get = scmi_reset_name_get,
.latency_get = scmi_reset_latency_get,
.reset = scmi_reset_domain_reset,
.assert = scmi_reset_domain_assert,
.deassert = scmi_reset_domain_deassert,
};
static int scmi_reset_protocol_init(struct scmi_handle *handle)
{
int domain;
u32 version;
struct scmi_reset_info *pinfo;
scmi_version_get(handle, SCMI_PROTOCOL_RESET, &version);
dev_dbg(handle->dev, "Reset Version %d.%d\n",
PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
pinfo = devm_kzalloc(handle->dev, sizeof(*pinfo), GFP_KERNEL);
if (!pinfo)
return -ENOMEM;
scmi_reset_attributes_get(handle, pinfo);
pinfo->dom_info = devm_kcalloc(handle->dev, pinfo->num_domains,
sizeof(*pinfo->dom_info), GFP_KERNEL);
if (!pinfo->dom_info)
return -ENOMEM;
for (domain = 0; domain < pinfo->num_domains; domain++) {
struct reset_dom_info *dom = pinfo->dom_info + domain;
scmi_reset_domain_attributes_get(handle, domain, dom);
}
handle->reset_ops = &reset_ops;
handle->reset_priv = pinfo;
return 0;
}
static int __init scmi_reset_init(void)
{
return scmi_protocol_register(SCMI_PROTOCOL_RESET,
&scmi_reset_protocol_init);
}
subsys_initcall(scmi_reset_init);

57
drivers/firmware/arm_scmi/sensors.c
View File

@ -9,8 +9,8 @@
enum scmi_sensor_protocol_cmd {
SENSOR_DESCRIPTION_GET = 0x3,
SENSOR_CONFIG_SET = 0x4,
SENSOR_TRIP_POINT_SET = 0x5,
SENSOR_TRIP_POINT_NOTIFY = 0x4,
SENSOR_TRIP_POINT_CONFIG = 0x5,
SENSOR_READING_GET = 0x6,
};
@ -42,9 +42,10 @@ struct scmi_msg_resp_sensor_description {
} desc[0];
};
struct scmi_msg_set_sensor_config {
struct scmi_msg_sensor_trip_point_notify {
__le32 id;
__le32 event_control;
#define SENSOR_TP_NOTIFY_ALL BIT(0)
};
struct scmi_msg_set_sensor_trip_point {
@ -119,7 +120,7 @@ static int scmi_sensor_description_get(const struct scmi_handle *handle,
do {
/* Set the number of sensors to be skipped/already read */
*(__le32 *)t->tx.buf = cpu_to_le32(desc_index);
put_unaligned_le32(desc_index, t->tx.buf);
ret = scmi_do_xfer(handle, t);
if (ret)
@ -135,9 +136,10 @@ static int scmi_sensor_description_get(const struct scmi_handle *handle,
}
for (cnt = 0; cnt < num_returned; cnt++) {
u32 attrh;
u32 attrh, attrl;
struct scmi_sensor_info *s;
attrl = le32_to_cpu(buf->desc[cnt].attributes_low);
attrh = le32_to_cpu(buf->desc[cnt].attributes_high);
s = &si->sensors[desc_index + cnt];
s->id = le32_to_cpu(buf->desc[cnt].id);
@ -146,6 +148,8 @@ static int scmi_sensor_description_get(const struct scmi_handle *handle,
/* Sign extend to a full s8 */
if (s->scale & SENSOR_SCALE_SIGN)
s->scale |= SENSOR_SCALE_EXTEND;
s->async = SUPPORTS_ASYNC_READ(attrl);
s->num_trip_points = NUM_TRIP_POINTS(attrl);
strlcpy(s->name, buf->desc[cnt].name, SCMI_MAX_STR_SIZE);
}
@ -160,15 +164,15 @@ static int scmi_sensor_description_get(const struct scmi_handle *handle,
return ret;
}
static int
scmi_sensor_configuration_set(const struct scmi_handle *handle, u32 sensor_id)
static int scmi_sensor_trip_point_notify(const struct scmi_handle *handle,
u32 sensor_id, bool enable)
{
int ret;
u32 evt_cntl = BIT(0);
u32 evt_cntl = enable ? SENSOR_TP_NOTIFY_ALL : 0;
struct scmi_xfer *t;
struct scmi_msg_set_sensor_config *cfg;
struct scmi_msg_sensor_trip_point_notify *cfg;
ret = scmi_xfer_get_init(handle, SENSOR_CONFIG_SET,
ret = scmi_xfer_get_init(handle, SENSOR_TRIP_POINT_NOTIFY,
SCMI_PROTOCOL_SENSOR, sizeof(*cfg), 0, &t);
if (ret)
return ret;
@ -183,15 +187,16 @@ scmi_sensor_configuration_set(const struct scmi_handle *handle, u32 sensor_id)
return ret;
}
static int scmi_sensor_trip_point_set(const struct scmi_handle *handle,
u32 sensor_id, u8 trip_id, u64 trip_value)
static int
scmi_sensor_trip_point_config(const struct scmi_handle *handle, u32 sensor_id,
u8 trip_id, u64 trip_value)
{
int ret;
u32 evt_cntl = SENSOR_TP_BOTH;
struct scmi_xfer *t;
struct scmi_msg_set_sensor_trip_point *trip;
ret = scmi_xfer_get_init(handle, SENSOR_TRIP_POINT_SET,
ret = scmi_xfer_get_init(handle, SENSOR_TRIP_POINT_CONFIG,
SCMI_PROTOCOL_SENSOR, sizeof(*trip), 0, &t);
if (ret)
return ret;
@ -209,11 +214,13 @@ static int scmi_sensor_trip_point_set(const struct scmi_handle *handle,
}
static int scmi_sensor_reading_get(const struct scmi_handle *handle,
u32 sensor_id, bool async, u64 *value)
u32 sensor_id, u64 *value)
{
int ret;
struct scmi_xfer *t;
struct scmi_msg_sensor_reading_get *sensor;
struct sensors_info *si = handle->sensor_priv;
struct scmi_sensor_info *s = si->sensors + sensor_id;
ret = scmi_xfer_get_init(handle, SENSOR_READING_GET,
SCMI_PROTOCOL_SENSOR, sizeof(*sensor),
@ -223,14 +230,18 @@ static int scmi_sensor_reading_get(const struct scmi_handle *handle,
sensor = t->tx.buf;
sensor->id = cpu_to_le32(sensor_id);
sensor->flags = cpu_to_le32(async ? SENSOR_READ_ASYNC : 0);
ret = scmi_do_xfer(handle, t);
if (!ret) {
__le32 *pval = t->rx.buf;
*value = le32_to_cpu(*pval);
*value |= (u64)le32_to_cpu(*(pval + 1)) << 32;
if (s->async) {
sensor->flags = cpu_to_le32(SENSOR_READ_ASYNC);
ret = scmi_do_xfer_with_response(handle, t);
if (!ret)
*value = get_unaligned_le64((void *)
((__le32 *)t->rx.buf + 1));
} else {
sensor->flags = cpu_to_le32(0);
ret = scmi_do_xfer(handle, t);
if (!ret)
*value = get_unaligned_le64(t->rx.buf);
}
scmi_xfer_put(handle, t);
@ -255,8 +266,8 @@ static int scmi_sensor_count_get(const struct scmi_handle *handle)
static struct scmi_sensor_ops sensor_ops = {
.count_get = scmi_sensor_count_get,
.info_get = scmi_sensor_info_get,
.configuration_set = scmi_sensor_configuration_set,
.trip_point_set = scmi_sensor_trip_point_set,
.trip_point_notify = scmi_sensor_trip_point_notify,
.trip_point_config = scmi_sensor_trip_point_config,
.reading_get = scmi_sensor_reading_get,
};

2
drivers/hwmon/scmi-hwmon.c
View File

@ -72,7 +72,7 @@ static int scmi_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
const struct scmi_handle *h = scmi_sensors->handle;
sensor = *(scmi_sensors->info[type] + channel);
ret = h->sensor_ops->reading_get(h, sensor->id, false, &value);
ret = h->sensor_ops->reading_get(h, sensor->id, &value);
if (ret)
return ret;

11
drivers/reset/Kconfig
View File

@ -116,6 +116,17 @@ config RESET_QCOM_PDC
to control reset signals provided by PDC for Modem, Compute,
Display, GPU, Debug, AOP, Sensors, Audio, SP and APPS.
config RESET_SCMI
tristate "Reset driver controlled via ARM SCMI interface"
depends on ARM_SCMI_PROTOCOL || COMPILE_TEST
default ARM_SCMI_PROTOCOL
help
This driver provides support for reset signal/domains that are
controlled by firmware that implements the SCMI interface.
This driver uses SCMI Message Protocol to interact with the
firmware controlling all the reset signals.
config RESET_SIMPLE
bool "Simple Reset Controller Driver" if COMPILE_TEST
default ARCH_STM32 || ARCH_STRATIX10 || ARCH_SUNXI || ARCH_ZX || ARCH_ASPEED || ARCH_BITMAIN

1
drivers/reset/Makefile
View File

@ -18,6 +18,7 @@ obj-$(CONFIG_RESET_OXNAS) += reset-oxnas.o
obj-$(CONFIG_RESET_PISTACHIO) += reset-pistachio.o
obj-$(CONFIG_RESET_QCOM_AOSS) += reset-qcom-aoss.o
obj-$(CONFIG_RESET_QCOM_PDC) += reset-qcom-pdc.o
obj-$(CONFIG_RESET_SCMI) += reset-scmi.o
obj-$(CONFIG_RESET_SIMPLE) += reset-simple.o
obj-$(CONFIG_RESET_STM32MP157) += reset-stm32mp1.o
obj-$(CONFIG_RESET_SOCFPGA) += reset-socfpga.o

125
drivers/reset/reset-scmi.c 100644
View File

@ -0,0 +1,125 @@
// SPDX-License-Identifier: GPL-2.0
/*
* ARM System Control and Management Interface (ARM SCMI) reset driver
*
* Copyright (C) 2019 ARM Ltd.
*/
#include <linux/module.h>
#include <linux/of.h>
#include <linux/device.h>
#include <linux/reset-controller.h>
#include <linux/scmi_protocol.h>
/**
* struct scmi_reset_data - reset controller information structure
* @rcdev: reset controller entity
* @handle: ARM SCMI handle used for communication with system controller
*/
struct scmi_reset_data {
struct reset_controller_dev rcdev;
const struct scmi_handle *handle;
};
#define to_scmi_reset_data(p) container_of((p), struct scmi_reset_data, rcdev)
#define to_scmi_handle(p) (to_scmi_reset_data(p)->handle)
/**
* scmi_reset_assert() - assert device reset
* @rcdev: reset controller entity
* @id: ID of the reset to be asserted
*
* This function implements the reset driver op to assert a device's reset
* using the ARM SCMI protocol.
*
* Return: 0 for successful request, else a corresponding error value
*/
static int
scmi_reset_assert(struct reset_controller_dev *rcdev, unsigned long id)
{
const struct scmi_handle *handle = to_scmi_handle(rcdev);
return handle->reset_ops->assert(handle, id);
}
/**
* scmi_reset_deassert() - deassert device reset
* @rcdev: reset controller entity
* @id: ID of the reset to be deasserted
*
* This function implements the reset driver op to deassert a device's reset
* using the ARM SCMI protocol.
*
* Return: 0 for successful request, else a corresponding error value
*/
static int
scmi_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id)
{
const struct scmi_handle *handle = to_scmi_handle(rcdev);
return handle->reset_ops->deassert(handle, id);
}
/**
* scmi_reset_reset() - reset the device
* @rcdev: reset controller entity
* @id: ID of the reset signal to be reset(assert + deassert)
*
* This function implements the reset driver op to trigger a device's
* reset signal using the ARM SCMI protocol.
*
* Return: 0 for successful request, else a corresponding error value
*/
static int
scmi_reset_reset(struct reset_controller_dev *rcdev, unsigned long id)
{
const struct scmi_handle *handle = to_scmi_handle(rcdev);
return handle->reset_ops->reset(handle, id);
}
static const struct reset_control_ops scmi_reset_ops = {
.assert = scmi_reset_assert,
.deassert = scmi_reset_deassert,
.reset = scmi_reset_reset,
};
static int scmi_reset_probe(struct scmi_device *sdev)
{
struct scmi_reset_data *data;
struct device *dev = &sdev->dev;
struct device_node *np = dev->of_node;
const struct scmi_handle *handle = sdev->handle;
if (!handle || !handle->reset_ops)
return -ENODEV;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->rcdev.ops = &scmi_reset_ops;
data->rcdev.owner = THIS_MODULE;
data->rcdev.of_node = np;
data->rcdev.nr_resets = handle->reset_ops->num_domains_get(handle);
data->handle = handle;
return devm_reset_controller_register(dev, &data->rcdev);
}
static const struct scmi_device_id scmi_id_table[] = {
{ SCMI_PROTOCOL_RESET },
{ },
};
MODULE_DEVICE_TABLE(scmi, scmi_id_table);
static struct scmi_driver scmi_reset_driver = {
.name = "scmi-reset",
.probe = scmi_reset_probe,
.id_table = scmi_id_table,
};
module_scmi_driver(scmi_reset_driver);
MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
MODULE_DESCRIPTION("ARM SCMI reset controller driver");
MODULE_LICENSE("GPL v2");

46
include/linux/scmi_protocol.h
View File

@ -1,4 +1,4 @@
// SPDX-License-Identifier: GPL-2.0
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* SCMI Message Protocol driver header
*
@ -71,7 +71,7 @@ struct scmi_clk_ops {
int (*rate_get)(const struct scmi_handle *handle, u32 clk_id,
u64 *rate);
int (*rate_set)(const struct scmi_handle *handle, u32 clk_id,
u32 config, u64 rate);
u64 rate);
int (*enable)(const struct scmi_handle *handle, u32 clk_id);
int (*disable)(const struct scmi_handle *handle, u32 clk_id);
};
@ -145,6 +145,8 @@ struct scmi_sensor_info {
u32 id;
u8 type;
s8 scale;
u8 num_trip_points;
bool async;
char name[SCMI_MAX_STR_SIZE];
};
@ -167,9 +169,9 @@ enum scmi_sensor_class {
*
* @count_get: get the count of sensors provided by SCMI
* @info_get: get the information of the specified sensor
* @configuration_set: control notifications on cross-over events for
* @trip_point_notify: control notifications on cross-over events for
* the trip-points
* @trip_point_set: selects and configures a trip-point of interest
* @trip_point_config: selects and configures a trip-point of interest
* @reading_get: gets the current value of the sensor
*/
struct scmi_sensor_ops {
@ -177,12 +179,32 @@ struct scmi_sensor_ops {
const struct scmi_sensor_info *(*info_get)
(const struct scmi_handle *handle, u32 sensor_id);
int (*configuration_set)(const struct scmi_handle *handle,
u32 sensor_id);
int (*trip_point_set)(const struct scmi_handle *handle, u32 sensor_id,
u8 trip_id, u64 trip_value);
int (*trip_point_notify)(const struct scmi_handle *handle,
u32 sensor_id, bool enable);
int (*trip_point_config)(const struct scmi_handle *handle,
u32 sensor_id, u8 trip_id, u64 trip_value);
int (*reading_get)(const struct scmi_handle *handle, u32 sensor_id,
bool async, u64 *value);
u64 *value);
};
/**
* struct scmi_reset_ops - represents the various operations provided
* by SCMI Reset Protocol
*
* @num_domains_get: get the count of reset domains provided by SCMI
* @name_get: gets the name of a reset domain
* @latency_get: gets the reset latency for the specified reset domain
* @reset: resets the specified reset domain
* @assert: explicitly assert reset signal of the specified reset domain
* @deassert: explicitly deassert reset signal of the specified reset domain
*/
struct scmi_reset_ops {
int (*num_domains_get)(const struct scmi_handle *handle);
char *(*name_get)(const struct scmi_handle *handle, u32 domain);
int (*latency_get)(const struct scmi_handle *handle, u32 domain);
int (*reset)(const struct scmi_handle *handle, u32 domain);
int (*assert)(const struct scmi_handle *handle, u32 domain);
int (*deassert)(const struct scmi_handle *handle, u32 domain);
};
/**
@ -194,6 +216,7 @@ struct scmi_sensor_ops {
* @perf_ops: pointer to set of performance protocol operations
* @clk_ops: pointer to set of clock protocol operations
* @sensor_ops: pointer to set of sensor protocol operations
* @reset_ops: pointer to set of reset protocol operations
* @perf_priv: pointer to private data structure specific to performance
* protocol(for internal use only)
* @clk_priv: pointer to private data structure specific to clock
@ -202,6 +225,8 @@ struct scmi_sensor_ops {
* protocol(for internal use only)
* @sensor_priv: pointer to private data structure specific to sensors
* protocol(for internal use only)
* @reset_priv: pointer to private data structure specific to reset
* protocol(for internal use only)
*/
struct scmi_handle {
struct device *dev;
@ -210,11 +235,13 @@ struct scmi_handle {
struct scmi_clk_ops *clk_ops;
struct scmi_power_ops *power_ops;
struct scmi_sensor_ops *sensor_ops;
struct scmi_reset_ops *reset_ops;
/* for protocol internal use */
void *perf_priv;
void *clk_priv;
void *power_priv;
void *sensor_priv;
void *reset_priv;
};
enum scmi_std_protocol {
@ -224,6 +251,7 @@ enum scmi_std_protocol {
SCMI_PROTOCOL_PERF = 0x13,
SCMI_PROTOCOL_CLOCK = 0x14,
SCMI_PROTOCOL_SENSOR = 0x15,
SCMI_PROTOCOL_RESET = 0x16,
};
struct scmi_device {