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Message-ID: <ed4ec39d-2b3a-1223-00c3-67d0494e99e6@arm.com>
Date: Thu, 25 Aug 2016 17:40:10 +0100
From: Sudeep Holla <sudeep.holla@....com>
To: Neil Armstrong <narmstrong@...libre.com>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc: Sudeep Holla <sudeep.holla@....com>,
linux-amlogic@...ts.infradead.org, khilman@...libre.com,
heiko@...ech.de, wxt@...k-chips.com, frank.wang@...k-chips.com
Subject: Re: [PATCH v2 0/7] scpi: Add support for legacy SCPI protocol
On 25/08/16 14:45, Sudeep Holla wrote:
>
>
> On 25/08/16 14:18, Neil Armstrong wrote:
[...]
>> Here I used if(is_legacy) to stop duplicating functions, is this ok
>> for you ?
>>
>
> I am still thinking if it can be abstracted well, some kind of mapping
> but haven't thought too much about that yet. Also I was thinking about
> bitmap for high priority commands. I remember doing something before but
> seem to have lost that copy. I will try to dig it out..
>
OK how about something like:
1. in struct scpi_drvinfo
DECLARE_BITMAP(cmd_priority, SCPI_CMD_COUNT);
2. scpi_send_message
scpi_chan = test_bit(cmd, scpi_info->cmd_priority) ?
scpi_info->channels + 1 : scpi_info->channels;
3. probe
for (idx = 0; idx < ARRAY_SIZE(hpriority_cmds); idx++)
set_bit(hpriority_cmds[idx], scpi_info->cmd_priority);
For commands, I am thinking some kind of indirection like the below
patch. See if that helps, I will add the description later, but you can
build your patches on top of it if you think that works and keeps code
simple.
Regards,
Sudeep
-->8
From afde0d2f1d3381d443445301ab5ec111276934e5 Mon Sep 17 00:00:00 2001
From: Sudeep Holla <sudeep.holla@....com>
Date: Thu, 25 Aug 2016 17:21:49 +0100
Subject: [PATCH] firmware: arm_scpi: create command indirection to support
legacy commands
Signed-off-by: Sudeep Holla <sudeep.holla@....com>
---
drivers/firmware/arm_scpi.c | 68
+++++++++++++++++++++++++++++++++------------
1 file changed, 51 insertions(+), 17 deletions(-)
diff --git a/drivers/firmware/arm_scpi.c b/drivers/firmware/arm_scpi.c
index 438893762076..c2063cb76b08 100644
--- a/drivers/firmware/arm_scpi.c
+++ b/drivers/firmware/arm_scpi.c
@@ -129,7 +129,39 @@ enum scpi_std_cmd {
SCPI_CMD_SENSOR_ASYNC_VALUE = 0x1a,
SCPI_CMD_SET_DEVICE_PWR_STATE = 0x1b,
SCPI_CMD_GET_DEVICE_PWR_STATE = 0x1c,
- SCPI_CMD_COUNT
+};
+
+enum scpi_drv_cmd {
+ SCPI_CAPABILITIES = 0,
+ GET_DVFS_INFO = 1,
+ SET_DVFS = 2,
+ GET_DVFS = 3,
+ GET_CLOCK_INFO = 4,
+ SET_CLOCK_VALUE = 5,
+ GET_CLOCK_VALUE = 6,
+ PSU_CAPABILITIES = 7,
+ SENSOR_CAPABILITIES = 8,
+ SENSOR_INFO = 9,
+ SENSOR_VALUE = 10,
+ SET_DEV_PWR_STATE = 11,
+ GET_DEV_PWR_STATE = 12,
+ CMD_MAX_COUNT
+};
+
+static int scpi_std_commands[CMD_MAX_COUNT] = {
+ SCPI_CMD_SCPI_CAPABILITIES,
+ SCPI_CMD_GET_DVFS_INFO,
+ SCPI_CMD_SET_DVFS,
+ SCPI_CMD_GET_DVFS,
+ SCPI_CMD_GET_CLOCK_INFO,
+ SCPI_CMD_SET_CLOCK_VALUE,
+ SCPI_CMD_GET_CLOCK_VALUE,
+ SCPI_CMD_PSU_CAPABILITIES,
+ SCPI_CMD_SENSOR_CAPABILITIES,
+ SCPI_CMD_SENSOR_INFO,
+ SCPI_CMD_SENSOR_VALUE,
+ SCPI_CMD_SET_DEVICE_PWR_STATE,
+ SCPI_CMD_GET_DEVICE_PWR_STATE,
};
struct scpi_xfer {
@@ -161,6 +193,7 @@ struct scpi_drvinfo {
u32 protocol_version;
u32 firmware_version;
int num_chans;
+ int *cmds;
atomic_t next_chan;
struct scpi_ops *scpi_ops;
struct scpi_chan *channels;
@@ -397,7 +430,7 @@ scpi_clk_get_range(u16 clk_id, unsigned long *min,
unsigned long *max)
struct clk_get_info clk;
__le16 le_clk_id = cpu_to_le16(clk_id);
- ret = scpi_send_message(SCPI_CMD_GET_CLOCK_INFO, &le_clk_id,
+ ret = scpi_send_message(scpi_info->cmds[GET_CLOCK_INFO], &le_clk_id,
sizeof(le_clk_id), &clk, sizeof(clk));
if (!ret) {
*min = le32_to_cpu(clk.min_rate);
@@ -412,7 +445,7 @@ static unsigned long scpi_clk_get_val(u16 clk_id)
struct clk_get_value clk;
__le16 le_clk_id = cpu_to_le16(clk_id);
- ret = scpi_send_message(SCPI_CMD_GET_CLOCK_VALUE, &le_clk_id,
+ ret = scpi_send_message(scpi_info->cmds[GET_CLOCK_VALUE], &le_clk_id,
sizeof(le_clk_id), &clk, sizeof(clk));
return ret ? ret : le32_to_cpu(clk.rate);
}
@@ -425,8 +458,8 @@ static int scpi_clk_set_val(u16 clk_id, unsigned
long rate)
.rate = cpu_to_le32(rate)
};
- return scpi_send_message(SCPI_CMD_SET_CLOCK_VALUE, &clk, sizeof(clk),
- &stat, sizeof(stat));
+ return scpi_send_message(scpi_info->cmds[SET_CLOCK_VALUE], &clk,
+ sizeof(clk), &stat, sizeof(stat));
}
static int scpi_dvfs_get_idx(u8 domain)
@@ -434,8 +467,8 @@ static int scpi_dvfs_get_idx(u8 domain)
int ret;
u8 dvfs_idx;
- ret = scpi_send_message(SCPI_CMD_GET_DVFS, &domain, sizeof(domain),
- &dvfs_idx, sizeof(dvfs_idx));
+ ret = scpi_send_message(scpi_info->cmds[GET_DVFS], &domain,
+ sizeof(domain), &dvfs_idx, sizeof(dvfs_idx));
return ret ? ret : dvfs_idx;
}
@@ -444,7 +477,7 @@ static int scpi_dvfs_set_idx(u8 domain, u8 index)
int stat;
struct dvfs_set dvfs = {domain, index};
- return scpi_send_message(SCPI_CMD_SET_DVFS, &dvfs, sizeof(dvfs),
+ return scpi_send_message(scpi_info->cmds[SET_DVFS], &dvfs, sizeof(dvfs),
&stat, sizeof(stat));
}
@@ -468,8 +501,8 @@ static struct scpi_dvfs_info
*scpi_dvfs_get_info(u8 domain)
if (scpi_info->dvfs[domain]) /* data already populated */
return scpi_info->dvfs[domain];
- ret = scpi_send_message(SCPI_CMD_GET_DVFS_INFO, &domain, sizeof(domain),
- &buf, sizeof(buf));
+ ret = scpi_send_message(scpi_info->cmds[GET_DVFS_INFO], &domain,
+ sizeof(domain), &buf, sizeof(buf));
if (ret)
return ERR_PTR(ret);
@@ -503,8 +536,8 @@ static int scpi_sensor_get_capability(u16 *sensors)
struct sensor_capabilities cap_buf;
int ret;
- ret = scpi_send_message(SCPI_CMD_SENSOR_CAPABILITIES, NULL, 0, &cap_buf,
- sizeof(cap_buf));
+ ret = scpi_send_message(scpi_info->cmds[SENSOR_CAPABILITIES], NULL, 0,
+ &cap_buf, sizeof(cap_buf));
if (!ret)
*sensors = le16_to_cpu(cap_buf.sensors);
@@ -517,7 +550,7 @@ static int scpi_sensor_get_info(u16 sensor_id,
struct scpi_sensor_info *info)
struct _scpi_sensor_info _info;
int ret;
- ret = scpi_send_message(SCPI_CMD_SENSOR_INFO, &id, sizeof(id),
+ ret = scpi_send_message(scpi_info->cmds[SENSOR_INFO], &id, sizeof(id),
&_info, sizeof(_info));
if (!ret) {
memcpy(info, &_info, sizeof(*info));
@@ -533,7 +566,7 @@ static int scpi_sensor_get_value(u16 sensor, u64 *val)
struct sensor_value buf;
int ret;
- ret = scpi_send_message(SCPI_CMD_SENSOR_VALUE, &id, sizeof(id),
+ ret = scpi_send_message(scpi_info->cmds[SENSOR_VALUE], &id, sizeof(id),
&buf, sizeof(buf));
if (!ret)
*val = (u64)le32_to_cpu(buf.hi_val) << 32 |
@@ -548,7 +581,7 @@ static int scpi_device_get_power_state(u16 dev_id)
u8 pstate;
__le16 id = cpu_to_le16(dev_id);
- ret = scpi_send_message(SCPI_CMD_GET_DEVICE_PWR_STATE, &id,
+ ret = scpi_send_message(scpi_info->cmds[GET_DEV_PWR_STATE], &id,
sizeof(id), &pstate, sizeof(pstate));
return ret ? ret : pstate;
}
@@ -561,7 +594,7 @@ static int scpi_device_set_power_state(u16 dev_id,
u8 pstate)
.pstate = pstate,
};
- return scpi_send_message(SCPI_CMD_SET_DEVICE_PWR_STATE, &dev_set,
+ return scpi_send_message(scpi_info->cmds[SET_DEV_PWR_STATE], &dev_set,
sizeof(dev_set), &stat, sizeof(stat));
}
@@ -591,7 +624,7 @@ static int scpi_init_versions(struct scpi_drvinfo
*info)
int ret;
struct scp_capabilities caps;
- ret = scpi_send_message(SCPI_CMD_SCPI_CAPABILITIES, NULL, 0,
+ ret = scpi_send_message(info->cmds[SCPI_CAPABILITIES], NULL, 0,
&caps, sizeof(caps));
if (!ret) {
info->protocol_version = le32_to_cpu(caps.protocol_version);
@@ -754,6 +787,7 @@ static int scpi_probe(struct platform_device *pdev)
scpi_info->channels = scpi_chan;
scpi_info->num_chans = count;
+ scpi_info->cmds = scpi_std_commands;
platform_set_drvdata(pdev, scpi_info);
ret = scpi_init_versions(scpi_info);
--
2.7.4
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