Minor adjustments to fix building with U-Boot and work correctly as a synchronous driver without interrupts. RPMh is fast enough that we can get away with just firing off requests and assuming they complete.
U-Boot behaviour changes are annotated with a "U-Boot:" comment.
Signed-off-by: Caleb Connolly caleb.connolly@linaro.org --- drivers/soc/qcom/rpmh-rsc.c | 78 +++++++++++++++++---------------------------- 1 file changed, 29 insertions(+), 49 deletions(-)
diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c index d4ef88dda184..566fa16baba9 100644 --- a/drivers/soc/qcom/rpmh-rsc.c +++ b/drivers/soc/qcom/rpmh-rsc.c @@ -134,16 +134,8 @@ enum { * | ...... | * +---------------------------------------------------+ */
-#define USECS_TO_CYCLES(time_usecs) \ - xloops_to_cycles((time_usecs) * 0x10C7UL) - -static inline unsigned long xloops_to_cycles(u64 xloops) -{ - return (xloops * loops_per_jiffy * HZ) >> 32; -} - static u32 rpmh_rsc_reg_offset_ver_2_7[] = { [RSC_DRV_TCS_OFFSET] = 672, [RSC_DRV_CMD_OFFSET] = 20, [DRV_SOLVER_CONFIG] = 0x04, @@ -248,37 +240,18 @@ static void write_tcs_reg_sync(const struct rsc_drv *drv, int reg, int tcs_id, */ static struct tcs_group *get_tcs_for_msg(struct rsc_drv *drv, const struct tcs_request *msg) { - int type; - struct tcs_group *tcs; - - switch (msg->state) { - case RPMH_ACTIVE_ONLY_STATE: - type = ACTIVE_TCS; - break; - case RPMH_WAKE_ONLY_STATE: - type = WAKE_TCS; - break; - case RPMH_SLEEP_STATE: - type = SLEEP_TCS; - break; - default: + /* + * U-Boot: since we're single threaded and running synchronously we can + * just always used the first active TCS. + */ + if (msg->state != RPMH_ACTIVE_ONLY_STATE) { + log_err("WARN: only ACTIVE_ONLY state supported\n"); return ERR_PTR(-EINVAL); }
- /* - * If we are making an active request on a RSC that does not have a - * dedicated TCS for active state use, then re-purpose a wake TCS to - * send active votes. This is safe because we ensure any active-only - * transfers have finished before we use it (maybe by running from - * the last CPU in PM code). - */ - tcs = &drv->tcs[type]; - if (msg->state == RPMH_ACTIVE_ONLY_STATE && !tcs->num_tcs) - tcs = &drv->tcs[WAKE_TCS]; - - return tcs; + return &drv->tcs[ACTIVE_TCS]; }
/** * __tcs_buffer_write() - Write to TCS hardware from a request; don't trigger. @@ -298,11 +271,8 @@ static void __tcs_buffer_write(struct rsc_drv *drv, int tcs_id, int cmd_id, u32 cmd_enable = 0; struct tcs_cmd *cmd; int i, j;
- /* Convert all commands to RR when the request has wait_for_compl set */ - cmd_msgid |= msg->wait_for_compl ? CMD_MSGID_RESP_REQ : 0; - for (i = 0, j = cmd_id; i < msg->num_cmds; i++, j++) { cmd = &msg->cmds[i]; cmd_enable |= BIT(j); msgid = cmd_msgid; @@ -314,9 +284,11 @@ static void __tcs_buffer_write(struct rsc_drv *drv, int tcs_id, int cmd_id,
write_tcs_cmd(drv, drv->regs[RSC_DRV_CMD_MSGID], tcs_id, j, msgid); write_tcs_cmd(drv, drv->regs[RSC_DRV_CMD_ADDR], tcs_id, j, cmd->addr); write_tcs_cmd(drv, drv->regs[RSC_DRV_CMD_DATA], tcs_id, j, cmd->data); - trace_rpmh_send_msg(drv, tcs_id, msg->state, j, msgid, cmd); + debug("tcs(m): %d [%s] cmd(n): %d msgid: %#x addr: %#x data: %#x complete: %d\n", + tcs_id, msg->state == RPMH_ACTIVE_ONLY_STATE ? "active" : "?", j, msgid, + cmd->addr, cmd->data, cmd->wait); }
cmd_enable |= read_tcs_reg(drv, drv->regs[RSC_DRV_CMD_ENABLE], tcs_id); write_tcs_reg(drv, drv->regs[RSC_DRV_CMD_ENABLE], tcs_id, cmd_enable); @@ -346,34 +318,28 @@ static void __tcs_buffer_write(struct rsc_drv *drv, int tcs_id, int cmd_id, */ int rpmh_rsc_send_data(struct rsc_drv *drv, const struct tcs_request *msg) { struct tcs_group *tcs; - int tcs_id; - - might_sleep(); + int tcs_id, i; + u32 addr;
tcs = get_tcs_for_msg(drv, msg); if (IS_ERR(tcs)) return PTR_ERR(tcs);
- spin_lock_irq(&drv->lock); - - /* Wait forever for a free tcs. It better be there eventually! */ - wait_event_lock_irq(drv->tcs_wait, - (tcs_id = claim_tcs_for_req(drv, tcs, msg)) >= 0, - drv->lock); + /* u-boot is single-threaded, always use the first TCS as we'll never conflict */ + tcs_id = tcs->offset;
tcs->req[tcs_id - tcs->offset] = msg; - set_bit(tcs_id, drv->tcs_in_use); + generic_set_bit(tcs_id, drv->tcs_in_use); if (msg->state == RPMH_ACTIVE_ONLY_STATE && tcs->type != ACTIVE_TCS) { /* * Clear previously programmed WAKE commands in selected * repurposed TCS to avoid triggering them. tcs->slots will be * cleaned from rpmh_flush() by invoking rpmh_rsc_invalidate() */ write_tcs_reg_sync(drv, drv->regs[RSC_DRV_CMD_ENABLE], tcs_id, 0); } - spin_unlock_irq(&drv->lock);
/* * These two can be done after the lock is released because: * - We marked "tcs_in_use" under lock. @@ -383,8 +349,22 @@ int rpmh_rsc_send_data(struct rsc_drv *drv, const struct tcs_request *msg) * of __tcs_set_trigger() below. */ __tcs_buffer_write(drv, tcs_id, 0, msg);
+ /* U-Boot: Now wait for the TCS to be cleared, indicating that we're done */ + for (i = 0; i < USEC_PER_SEC; i++) { + addr = read_tcs_cmd(drv, drv->regs[RSC_DRV_CMD_ADDR], i, 0); + if (addr != msg->cmds[0].addr) + break; + udelay(1); + } + + if (i == USEC_PER_SEC) { + log_err("%s: error writing %#x to %d:%#x\n", drv->name, + msg->cmds[0].addr, tcs_id, drv->regs[RSC_DRV_CMD_ADDR]); + return -EINVAL; + } + return 0; }
static int rpmh_probe_tcs_config(struct udevice *dev, struct rsc_drv *drv)