Add IPA clock support by extending the current clk rpmh driver to support clocks that are managed by a different type of RPMh resource known as Bus Clock Manager(BCM). Signed-off-by: David Dai <daidavid1@xxxxxxxxxxxxxx> --- drivers/clk/qcom/clk-rpmh.c | 142 ++++++++++++++++++++++++++++++++++ include/dt-bindings/clock/qcom,rpmh.h | 1 + 2 files changed, 143 insertions(+) diff --git a/drivers/clk/qcom/clk-rpmh.c b/drivers/clk/qcom/clk-rpmh.c index 9f4fc77..42e2cd2 100644 --- a/drivers/clk/qcom/clk-rpmh.c +++ b/drivers/clk/qcom/clk-rpmh.c @@ -18,6 +18,32 @@ #define CLK_RPMH_ARC_EN_OFFSET 0 #define CLK_RPMH_VRM_EN_OFFSET 4 +#define BCM_TCS_CMD_COMMIT_MASK 0x40000000 +#define BCM_TCS_CMD_VALID_SHIFT 29 +#define BCM_TCS_CMD_VOTE_MASK 0x3fff +#define BCM_TCS_CMD_VOTE_SHIFT 0 + +#define BCM_TCS_CMD(valid, vote) \ + (BCM_TCS_CMD_COMMIT_MASK |\ + ((valid) << BCM_TCS_CMD_VALID_SHIFT) |\ + ((cpu_to_le32(vote) &\ + BCM_TCS_CMD_VOTE_MASK) << BCM_TCS_CMD_VOTE_SHIFT)) + +/** + * struct bcm_db - Auxiliary data pertaining to each Bus Clock Manager(BCM) + * @unit: divisor used to convert Hz value to an RPMh msg + * @width: multiplier used to convert Hz value to an RPMh msg + * @vcd: virtual clock domain that this bcm belongs to + * @reserved: reserved to pad the struct + */ + +struct bcm_db { + u32 unit; + u16 width; + u8 vcd; + u8 reserved; +}; + /** * struct clk_rpmh - individual rpmh clock data structure * @hw: handle between common and hardware-specific interfaces @@ -29,6 +55,7 @@ * @aggr_state: rpmh clock aggregated state * @last_sent_aggr_state: rpmh clock last aggr state sent to RPMh * @valid_state_mask: mask to determine the state of the rpmh clock + * @aux_data: data specific to the bcm rpmh resource * @dev: device to which it is attached * @peer: pointer to the clock rpmh sibling */ @@ -42,6 +69,7 @@ struct clk_rpmh { u32 aggr_state; u32 last_sent_aggr_state; u32 valid_state_mask; + struct bcm_db aux_data; struct device *dev; struct clk_rpmh *peer; }; @@ -98,6 +126,17 @@ struct clk_rpmh_desc { __DEFINE_CLK_RPMH(_platform, _name, _name_active, _res_name, \ CLK_RPMH_VRM_EN_OFFSET, 1, _div) +#define DEFINE_CLK_RPMH_BCM(_platform, _name, _res_name) \ + static struct clk_rpmh _platform##_##_name = { \ + .res_name = _res_name, \ + .valid_state_mask = BIT(RPMH_ACTIVE_ONLY_STATE), \ + .div = 1, \ + .hw.init = &(struct clk_init_data){ \ + .ops = &clk_rpmh_bcm_ops, \ + .name = #_name, \ + }, \ + } + static inline struct clk_rpmh *to_clk_rpmh(struct clk_hw *_hw) { return container_of(_hw, struct clk_rpmh, hw); @@ -210,6 +249,91 @@ static unsigned long clk_rpmh_recalc_rate(struct clk_hw *hw, .recalc_rate = clk_rpmh_recalc_rate, }; +static int clk_rpmh_bcm_send_cmd(struct clk_rpmh *c, bool enable) +{ + struct tcs_cmd cmd = { 0 }; + u32 cmd_state; + int ret; + + cmd_state = enable ? (c->aggr_state ? c->aggr_state : 1) : 0; + + if (c->last_sent_aggr_state == cmd_state) + return 0; + + cmd.addr = c->res_addr; + cmd.data = BCM_TCS_CMD(enable, cmd_state); + + ret = rpmh_write_async(c->dev, RPMH_ACTIVE_ONLY_STATE, &cmd, 1); + if (ret) { + dev_err(c->dev, "set active state of %s failed: (%d)\n", + c->res_name, ret); + return ret; + } + + c->last_sent_aggr_state = cmd_state; + + return 0; +} + +static int clk_rpmh_bcm_prepare(struct clk_hw *hw) +{ + struct clk_rpmh *c = to_clk_rpmh(hw); + int ret = 0; + + mutex_lock(&rpmh_clk_lock); + ret = clk_rpmh_bcm_send_cmd(c, true); + mutex_unlock(&rpmh_clk_lock); + + return ret; +}; + +static void clk_rpmh_bcm_unprepare(struct clk_hw *hw) +{ + struct clk_rpmh *c = to_clk_rpmh(hw); + + mutex_lock(&rpmh_clk_lock); + clk_rpmh_bcm_send_cmd(c, false); + mutex_unlock(&rpmh_clk_lock); +}; + +static int clk_rpmh_bcm_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct clk_rpmh *c = to_clk_rpmh(hw); + + c->aggr_state = rate / (c->aux_data.unit * 1000); + + if (clk_hw_is_prepared(hw)) { + mutex_lock(&rpmh_clk_lock); + clk_rpmh_bcm_send_cmd(c, true); + mutex_unlock(&rpmh_clk_lock); + } + + return 0; +}; + +static long clk_rpmh_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *parent_rate) +{ + return rate; +} + +static unsigned long clk_rpmh_bcm_recalc_rate(struct clk_hw *hw, + unsigned long prate) +{ + struct clk_rpmh *c = to_clk_rpmh(hw); + + return c->aggr_state * c->aux_data.unit * 1000; +} + +static const struct clk_ops clk_rpmh_bcm_ops = { + .prepare = clk_rpmh_bcm_prepare, + .unprepare = clk_rpmh_bcm_unprepare, + .set_rate = clk_rpmh_bcm_set_rate, + .round_rate = clk_rpmh_round_rate, + .recalc_rate = clk_rpmh_bcm_recalc_rate, +}; + /* Resource name must match resource id present in cmd-db. */ DEFINE_CLK_RPMH_ARC(sdm845, bi_tcxo, bi_tcxo_ao, "xo.lvl", 0x3, 2); DEFINE_CLK_RPMH_VRM(sdm845, ln_bb_clk2, ln_bb_clk2_ao, "lnbclka2", 2); @@ -217,6 +341,7 @@ static unsigned long clk_rpmh_recalc_rate(struct clk_hw *hw, DEFINE_CLK_RPMH_VRM(sdm845, rf_clk1, rf_clk1_ao, "rfclka1", 1); DEFINE_CLK_RPMH_VRM(sdm845, rf_clk2, rf_clk2_ao, "rfclka2", 1); DEFINE_CLK_RPMH_VRM(sdm845, rf_clk3, rf_clk3_ao, "rfclka3", 1); +DEFINE_CLK_RPMH_BCM(sdm845, ipa, "IP0"); static struct clk_hw *sdm845_rpmh_clocks[] = { [RPMH_CXO_CLK] = &sdm845_bi_tcxo.hw, @@ -231,6 +356,7 @@ static unsigned long clk_rpmh_recalc_rate(struct clk_hw *hw, [RPMH_RF_CLK2_A] = &sdm845_rf_clk2_ao.hw, [RPMH_RF_CLK3] = &sdm845_rf_clk3.hw, [RPMH_RF_CLK3_A] = &sdm845_rf_clk3_ao.hw, + [RPMH_IPA_CLK] = &sdm845_ipa.hw, }; static const struct clk_rpmh_desc clk_rpmh_sdm845 = { @@ -267,6 +393,7 @@ static int clk_rpmh_probe(struct platform_device *pdev) for (i = 0; i < desc->num_clks; i++) { u32 res_addr; + u32 aux_data_len; rpmh_clk = to_clk_rpmh(hw_clks[i]); res_addr = cmd_db_read_addr(rpmh_clk->res_name); @@ -275,6 +402,21 @@ static int clk_rpmh_probe(struct platform_device *pdev) rpmh_clk->res_name); return -ENODEV; } + aux_data_len = cmd_db_read_aux_data_len(rpmh_clk->res_name); + if (aux_data_len == sizeof(struct bcm_db)) { + ret = cmd_db_read_aux_data(rpmh_clk->res_name, + (u8 *)&rpmh_clk->aux_data, + sizeof(struct bcm_db)); + if (ret < 0) { + dev_err(&pdev->dev, "aux data read failure for %s (%d)\n", + rpmh_clk->res_name, ret); + return ret; + } + rpmh_clk->aux_data.unit = + le32_to_cpu(rpmh_clk->aux_data.unit); + rpmh_clk->aux_data.width = + le16_to_cpu(rpmh_clk->aux_data.width); + } rpmh_clk->res_addr += res_addr; rpmh_clk->dev = &pdev->dev; diff --git a/include/dt-bindings/clock/qcom,rpmh.h b/include/dt-bindings/clock/qcom,rpmh.h index f48fbd6..edcab3f 100644 --- a/include/dt-bindings/clock/qcom,rpmh.h +++ b/include/dt-bindings/clock/qcom,rpmh.h @@ -18,5 +18,6 @@ #define RPMH_RF_CLK2_A 9 #define RPMH_RF_CLK3 10 #define RPMH_RF_CLK3_A 11 +#define RPMH_IPA_CLK 12 #endif -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project