Add legacy SCPI driver based on the latest SCPI driver but modified to behave
like an earlier technology preview SCPI implementation that at least the
Amlogic GXBB ARMv8 based platform uses in it's SCP firmware implementation.
The main differences between the mainline, public and recommended SCPI
implementation are :
- virtual channels is not implemented
- command word is passed by the MHU instead of the virtual channel ID
- uses "sender id" in the command word for each commands groups
- payload size shift in command word is different
- command word is not in SRAM, so command queuing is not possible
- command indexes are different
- command data structures differs
- commands are redirected to low or high priority channels by their indexes,
so round-robin redirection is not possible
A clear disclaimer is added to make it clear this implementation should not
be used for new products and is only here to support already released SoCs.
Signed-off-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
---
drivers/firmware/Kconfig | 20 ++
drivers/firmware/Makefile | 1 +
drivers/firmware/legacy_scpi.c | 644 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 665 insertions(+)
create mode 100644 drivers/firmware/legacy_scpi.c
diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index 95b01f4..b9c2a33 100644
--- a/drivers/firmware/Kconfig
+++ b/drivers/firmware/Kconfig
@@ -31,6 +31,26 @@ config ARM_SCPI_PROTOCOL
This protocol library provides interface for all the client drivers
making use of the features offered by the SCP.
+config LEGACY_SCPI_PROTOCOL
+ bool "Legacy System Control and Power Interface (SCPI) Message Protocol"
+ default y if ARCH_MESON
+ select ARM_SCPI_FW
+ help
+ System Control and Power Interface (SCPI) Message Protocol is
+ defined for the purpose of communication between the Application
+ Cores(AP) and the System Control Processor(SCP). The MHU peripheral
+ provides a mechanism for inter-processor communication between SCP
+ and AP.
diff --git a/drivers/firmware/legacy_scpi.c b/drivers/firmware/legacy_scpi.c
new file mode 100644
index 0000000..4bd3ff7
--- /dev/null
+++ b/drivers/firmware/legacy_scpi.c
@@ -0,0 +1,644 @@
+
+#define CMD_ID_SHIFT 0
+#define CMD_ID_MASK 0x7f
+#define CMD_SENDER_ID_SHIFT 8
+#define CMD_SENDER_ID_MASK 0xff
+#define CMD_DATA_SIZE_SHIFT 20
+#define CMD_DATA_SIZE_MASK 0x1ff
+#define PACK_SCPI_CMD(cmd_id, sender, tx_sz) \
+ ((((cmd_id) & CMD_ID_MASK) << CMD_ID_SHIFT) | \
+ (((sender) & CMD_SENDER_ID_MASK) << CMD_SENDER_ID_SHIFT) | \
+ (((tx_sz) & CMD_DATA_SIZE_MASK) << CMD_DATA_SIZE_SHIFT))
+
+#define CMD_SIZE(cmd) (((cmd) >> CMD_DATA_SIZE_SHIFT) & CMD_DATA_SIZE_MASK)
+#define CMD_UNIQ_MASK (CMD_TOKEN_ID_MASK << CMD_TOKEN_ID_SHIFT | CMD_ID_MASK)
+#define CMD_XTRACT_UNIQ(cmd) ((cmd) & CMD_UNIQ_MASK)
+
+#define MAX_DVFS_DOMAINS 3
+#define MAX_DVFS_OPPS 16
+#define DVFS_LATENCY(hdr) (le32_to_cpu(hdr) >> 16)
+#define DVFS_OPP_COUNT(hdr) ((le32_to_cpu(hdr) >> 8) & 0xff)
+
+#define MAX_RX_TIMEOUT (msecs_to_jiffies(30))
+
+enum legacy_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
+};
+
+enum legacy_scpi_client_id {
+ SCPI_CL_NONE,
+ SCPI_CL_CLOCKS,
+ SCPI_CL_DVFS,
+ SCPI_CL_POWER,
+ SCPI_CL_THERMAL,
+ SCPI_CL_REMOTE,
+ SCPI_CL_LED_TIMER,
+ SCPI_MAX,
+};
+
+enum legacy_scpi_std_cmd {
+ SCPI_CMD_INVALID = 0x00,
+ SCPI_CMD_SCPI_READY = 0x01,
+ SCPI_CMD_SCPI_CAPABILITIES = 0x02,
+ SCPI_CMD_EVENT = 0x03,
+ SCPI_CMD_SET_CSS_PWR_STATE = 0x04,
+ SCPI_CMD_GET_CSS_PWR_STATE = 0x05,
+ SCPI_CMD_CFG_PWR_STATE_STAT = 0x06,
+ SCPI_CMD_GET_PWR_STATE_STAT = 0x07,
+ SCPI_CMD_SYS_PWR_STATE = 0x08,
+ SCPI_CMD_L2_READY = 0x09,
+ SCPI_CMD_SET_AP_TIMER = 0x0a,
+ SCPI_CMD_CANCEL_AP_TIME = 0x0b,
+ SCPI_CMD_DVFS_CAPABILITIES = 0x0c,
+ SCPI_CMD_GET_DVFS_INFO = 0x0d,
+ SCPI_CMD_SET_DVFS = 0x0e,
+ SCPI_CMD_GET_DVFS = 0x0f,
+ SCPI_CMD_GET_DVFS_STAT = 0x10,
+ SCPI_CMD_SET_RTC = 0x11,
+ SCPI_CMD_GET_RTC = 0x12,
+ SCPI_CMD_CLOCK_CAPABILITIES = 0x13,
+ SCPI_CMD_SET_CLOCK_INDEX = 0x14,
+ SCPI_CMD_SET_CLOCK_VALUE = 0x15,
+ SCPI_CMD_GET_CLOCK_VALUE = 0x16,
+ SCPI_CMD_PSU_CAPABILITIES = 0x17,
+ SCPI_CMD_SET_PSU = 0x18,
+ SCPI_CMD_GET_PSU = 0x19,
+ SCPI_CMD_SENSOR_CAPABILITIES = 0x1a,
+ SCPI_CMD_SENSOR_INFO = 0x1b,
+ SCPI_CMD_SENSOR_VALUE = 0x1c,
+ SCPI_CMD_SENSOR_CFG_PERIODIC = 0x1d,
+ SCPI_CMD_SENSOR_CFG_BOUNDS = 0x1e,
+ SCPI_CMD_SENSOR_ASYNC_VALUE = 0x1f,
+ SCPI_CMD_COUNT
+};
+
+struct legacy_scpi_xfer {
+ u32 cmd;
+ u32 status;
+ const void *tx_buf;
+ void *rx_buf;
+ unsigned int tx_len;
+ unsigned int rx_len;
+ struct completion done;
+};
+
+struct legacy_scpi_chan {
+ struct mbox_client cl;
+ struct mbox_chan *chan;
+ void __iomem *tx_payload;
+ void __iomem *rx_payload;
+ spinlock_t rx_lock; /* locking for the rx pending list */
+ struct mutex xfers_lock;
+ struct legacy_scpi_xfer t;
+};
+
+struct legacy_scpi_drvinfo {
+ int num_chans;
+ struct legacy_scpi_chan *channels;
+ struct scpi_dvfs_info *dvfs[MAX_DVFS_DOMAINS];
+};
+
+ legacy_scpi_info->channels = legacy_scpi_chan;
+ legacy_scpi_info->num_chans = count;
+ platform_set_drvdata(pdev, legacy_scpi_info);
+
+ ret = devm_scpi_ops_register(dev, &legacy_scpi_ops);