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soc: qcom: rpmh-rsc: Document the register layout better 

Perhaps it's just me, it took a really long time to understand what
the register layout of rpmh-rsc was just from the #defines.  Let's add
a bunch of comments describing which blocks are part of other blocks.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Maulik Shah <mkshah@codeaurora.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20200413100321.v4.2.Iaddc29b72772e6ea381238a0ee85b82d3903e5f2@changeid
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Douglas Anderson 2020-04-13 10:04:07 -07:00 committed by Bjorn Andersson
parent 3b5e3d50f8
commit 1f7dbeb51a
1 changed files with 74 additions and 5 deletions
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79
drivers/soc/qcom/rpmh-rsc.c
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@ -43,14 +43,29 @@
#define DRV_NCPT_MASK 0x1F
#define DRV_NCPT_SHIFT 27
/* Register offsets */
/* Offsets for common TCS Registers, one bit per TCS */
#define RSC_DRV_IRQ_ENABLE 0x00
#define RSC_DRV_IRQ_STATUS 0x04
#define RSC_DRV_IRQ_CLEAR 0x08
#define RSC_DRV_CMD_WAIT_FOR_CMPL 0x10
#define RSC_DRV_IRQ_CLEAR 0x08 /* w/o; write 1 to clear */
/*
* Offsets for per TCS Registers.
*
* TCSes start at 0x10 from tcs_base and are stored one after another.
* Multiply tcs_id by RSC_DRV_TCS_OFFSET to find a given TCS and add one
* of the below to find a register.
*/
#define RSC_DRV_CMD_WAIT_FOR_CMPL 0x10 /* 1 bit per command */
#define RSC_DRV_CONTROL 0x14
#define RSC_DRV_STATUS 0x18
#define RSC_DRV_CMD_ENABLE 0x1C
#define RSC_DRV_STATUS 0x18 /* zero if tcs is busy */
#define RSC_DRV_CMD_ENABLE 0x1C /* 1 bit per command */
/*
* Offsets for per command in a TCS.
*
* Commands (up to 16) start at 0x30 in a TCS; multiply command index
* by RSC_DRV_CMD_OFFSET and add one of the below to find a register.
*/
#define RSC_DRV_CMD_MSGID 0x30
#define RSC_DRV_CMD_ADDR 0x34
#define RSC_DRV_CMD_DATA 0x38
@ -67,6 +82,60 @@
#define CMD_STATUS_ISSUED BIT(8)
#define CMD_STATUS_COMPL BIT(16)
/*
* Here's a high level overview of how all the registers in RPMH work
* together:
*
* - The main rpmh-rsc address is the base of a register space that can
* be used to find overall configuration of the hardware
* (DRV_PRNT_CHLD_CONFIG). Also found within the rpmh-rsc register
* space are all the TCS blocks. The offset of the TCS blocks is
* specified in the device tree by "qcom,tcs-offset" and used to
* compute tcs_base.
* - TCS blocks come one after another. Type, count, and order are
* specified by the device tree as "qcom,tcs-config".
* - Each TCS block has some registers, then space for up to 16 commands.
* Note that though address space is reserved for 16 commands, fewer
* might be present. See ncpt (num cmds per TCS).
*
* Here's a picture:
*
* +---------------------------------------------------+
* |RSC |
* | ctrl |
* | |
* | Drvs: |
* | +-----------------------------------------------+ |
* | |DRV0 | |
* | | ctrl/config | |
* | | IRQ | |
* | | | |
* | | TCSes: | |
* | | +------------------------------------------+ | |
* | | |TCS0 | | | | | | | | | | | | | | |
* | | | ctrl | 0| 1| 2| 3| 4| 5| .| .| .| .|14|15| | |
* | | | | | | | | | | | | | | | | | |
* | | +------------------------------------------+ | |
* | | +------------------------------------------+ | |
* | | |TCS1 | | | | | | | | | | | | | | |
* | | | ctrl | 0| 1| 2| 3| 4| 5| .| .| .| .|14|15| | |
* | | | | | | | | | | | | | | | | | |
* | | +------------------------------------------+ | |
* | | +------------------------------------------+ | |
* | | |TCS2 | | | | | | | | | | | | | | |
* | | | ctrl | 0| 1| 2| 3| 4| 5| .| .| .| .|14|15| | |
* | | | | | | | | | | | | | | | | | |
* | | +------------------------------------------+ | |
* | | ...... | |
* | +-----------------------------------------------+ |
* | +-----------------------------------------------+ |
* | |DRV1 | |
* | | (same as DRV0) | |
* | +-----------------------------------------------+ |
* | ...... |
* +---------------------------------------------------+
*/
static u32 read_tcs_cmd(struct rsc_drv *drv, int reg, int tcs_id, int cmd_id)
{
return readl_relaxed(drv->tcs_base + RSC_DRV_TCS_OFFSET * tcs_id + reg +