diff mbox series

[3/8] devfreq: rk3399_dmc: Pass ODT and auto power down parameters to TF-A.

Message ID 20180730081124.30698-4-enric.balletbo@collabora.com (mailing list archive)
State Not Applicable, archived
Headers show
Series Add support for drm/rockchip to dynamically control the DDR frequency. | expand

Commit Message

Enric Balletbo i Serra July 30, 2018, 8:11 a.m. UTC 
Trusted Firmware-A (TF-A) for rk3399 implements a SiP call to get the
on-die termination (ODT) and auto power down parameters from kernel,
this patch adds the functionality to do this. Also, if DDR clock
frequency is lower than the on-die termination (ODT) disable frequency
this driver should disable the DDR ODT.

Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
---

Changes in v1:
- [RFC 3/10] Add an explanation for platform SIP calls.
- [RFC 3/10] Change if statement for a switch.
- [RFC 3/10] Rename ddr_flag to odt_enable to be more clear.

 drivers/devfreq/rk3399_dmc.c        | 74 ++++++++++++++++++++++++++++-
 include/soc/rockchip/rockchip_sip.h |  1 +
 2 files changed, 74 insertions(+), 1 deletion(-)

Comments

Chanwoo Choi Aug. 1, 2018, 9:08 a.m. UTC | #1 
Hi Enric,

On 2018년 07월 30일 17:11, Enric Balletbo i Serra wrote:
> Trusted Firmware-A (TF-A) for rk3399 implements a SiP call to get the
> on-die termination (ODT) and auto power down parameters from kernel,
> this patch adds the functionality to do this. Also, if DDR clock
> frequency is lower than the on-die termination (ODT) disable frequency
> this driver should disable the DDR ODT.
> 
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>

Looks good to me.
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>

> ---
> 
> Changes in v1:
> - [RFC 3/10] Add an explanation for platform SIP calls.
> - [RFC 3/10] Change if statement for a switch.
> - [RFC 3/10] Rename ddr_flag to odt_enable to be more clear.
> 
>  drivers/devfreq/rk3399_dmc.c        | 74 ++++++++++++++++++++++++++++-
>  include/soc/rockchip/rockchip_sip.h |  1 +
>  2 files changed, 74 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c
> index e795ad2b3f6b..c619dc4ac620 100644
> --- a/drivers/devfreq/rk3399_dmc.c
> +++ b/drivers/devfreq/rk3399_dmc.c
> @@ -18,14 +18,17 @@
>  #include <linux/devfreq.h>
>  #include <linux/devfreq-event.h>
>  #include <linux/interrupt.h>
> +#include <linux/mfd/syscon.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/platform_device.h>
>  #include <linux/pm_opp.h>
> +#include <linux/regmap.h>
>  #include <linux/regulator/consumer.h>
>  #include <linux/rwsem.h>
>  #include <linux/suspend.h>
>  
> +#include <soc/rockchip/rk3399_grf.h>
>  #include <soc/rockchip/rockchip_sip.h>
>  
>  struct dram_timing {
> @@ -69,8 +72,11 @@ struct rk3399_dmcfreq {
>  	struct mutex lock;
>  	struct dram_timing timing;
>  	struct regulator *vdd_center;
> +	struct regmap *regmap_pmu;
>  	unsigned long rate, target_rate;
>  	unsigned long volt, target_volt;
> +	unsigned int odt_dis_freq;
> +	int odt_pd_arg0, odt_pd_arg1;
>  };
>  
>  static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
> @@ -80,6 +86,8 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
>  	struct dev_pm_opp *opp;
>  	unsigned long old_clk_rate = dmcfreq->rate;
>  	unsigned long target_volt, target_rate;
> +	struct arm_smccc_res res;
> +	bool odt_enable = false;
>  	int err;
>  
>  	opp = devfreq_recommended_opp(dev, freq, flags);
> @@ -95,6 +103,19 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
>  
>  	mutex_lock(&dmcfreq->lock);
>  
> +	if (target_rate >= dmcfreq->odt_dis_freq)
> +		odt_enable = true;
> +
> +	/*
> +	 * This makes a SMC call to the TF-A to set the DDR PD (power-down)
> +	 * timings and to enable or disable the ODT (on-die termination)
> +	 * resistors.
> +	 */
> +	arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, dmcfreq->odt_pd_arg0,
> +		      dmcfreq->odt_pd_arg1,
> +		      ROCKCHIP_SIP_CONFIG_DRAM_SET_ODT_PD,
> +		      odt_enable, 0, 0, 0, &res);
> +
>  	/*
>  	 * If frequency scaling from low to high, adjust voltage first.
>  	 * If frequency scaling from high to low, adjust frequency first.
> @@ -294,11 +315,13 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
>  {
>  	struct arm_smccc_res res;
>  	struct device *dev = &pdev->dev;
> -	struct device_node *np = pdev->dev.of_node;
> +	struct device_node *np = pdev->dev.of_node, *node;
>  	struct rk3399_dmcfreq *data;
>  	int ret, index, size;
>  	uint32_t *timing;
>  	struct dev_pm_opp *opp;
> +	u32 ddr_type;
> +	u32 val;
>  
>  	data = devm_kzalloc(dev, sizeof(struct rk3399_dmcfreq), GFP_KERNEL);
>  	if (!data)
> @@ -334,6 +357,34 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>  
> +	/* Try to find the optional reference to the pmu syscon */
> +	node = of_parse_phandle(np, "rockchip,pmu", 0);
> +	if (node) {
> +		data->regmap_pmu = syscon_node_to_regmap(node);
> +		if (IS_ERR(data->regmap_pmu))
> +			return PTR_ERR(data->regmap_pmu);
> +	}
> +
> +	/* Get DDR type */
> +	regmap_read(data->regmap_pmu, RK3399_PMUGRF_OS_REG2, &val);
> +	ddr_type = (val >> RK3399_PMUGRF_DDRTYPE_SHIFT) &
> +		    RK3399_PMUGRF_DDRTYPE_MASK;
> +
> +	/* Get the odt_dis_freq parameter in function of the DDR type */
> +	switch (ddr_type) {
> +	case RK3399_PMUGRF_DDRTYPE_DDR3:
> +		data->odt_dis_freq = data->timing.ddr3_odt_dis_freq;
> +		break;
> +	case RK3399_PMUGRF_DDRTYPE_LPDDR3:
> +		data->odt_dis_freq = data->timing.lpddr3_odt_dis_freq;
> +		break;
> +	case RK3399_PMUGRF_DDRTYPE_LPDDR4:
> +		data->odt_dis_freq = data->timing.lpddr4_odt_dis_freq;
> +		break;
> +	default:
> +		return -EINVAL;
> +	};
> +
>  	/*
>  	 * Get dram timing and pass it to arm trust firmware,
>  	 * the dram drvier in arm trust firmware will get these
> @@ -358,6 +409,27 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
>  		      ROCKCHIP_SIP_CONFIG_DRAM_INIT,
>  		      0, 0, 0, 0, &res);
>  
> +	/*
> +	 * In TF-A there is a platform SIP call to set the PD (power-down)
> +	 * timings and to enable or disable the ODT (on-die termination).
> +	 * This call needs three arguments as follows:
> +	 *
> +	 * arg0:
> +	 *     bit[0-7]   : sr_idle
> +	 *     bit[8-15]  : sr_mc_gate_idle
> +	 *     bit[16-31] : standby idle
> +	 * arg1:
> +	 *     bit[0-11]  : pd_idle
> +	 *     bit[16-27] : srpd_lite_idle
> +	 * arg2:
> +	 *     bit[0]     : odt enable
> +	 */
> +	data->odt_pd_arg0 = (data->timing.sr_idle & 0xff) |
> +			    ((data->timing.sr_mc_gate_idle & 0xff) << 8) |
> +			    ((data->timing.standby_idle & 0xffff) << 16);
> +	data->odt_pd_arg1 = (data->timing.pd_idle & 0xfff) |
> +			    ((data->timing.srpd_lite_idle & 0xfff) << 16);
> +
>  	/*
>  	 * We add a devfreq driver to our parent since it has a device tree node
>  	 * with operating points.
> diff --git a/include/soc/rockchip/rockchip_sip.h b/include/soc/rockchip/rockchip_sip.h
> index 7e28092c4d3d..ad9482c56797 100644
> --- a/include/soc/rockchip/rockchip_sip.h
> +++ b/include/soc/rockchip/rockchip_sip.h
> @@ -23,5 +23,6 @@
>  #define ROCKCHIP_SIP_CONFIG_DRAM_GET_RATE	0x05
>  #define ROCKCHIP_SIP_CONFIG_DRAM_CLR_IRQ	0x06
>  #define ROCKCHIP_SIP_CONFIG_DRAM_SET_PARAM	0x07
> +#define ROCKCHIP_SIP_CONFIG_DRAM_SET_ODT_PD	0x08
>  
>  #endif
>
diff mbox series

Patch

diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c
index e795ad2b3f6b..c619dc4ac620 100644
--- a/drivers/devfreq/rk3399_dmc.c
+++ b/drivers/devfreq/rk3399_dmc.c
@@ -18,14 +18,17 @@ 
 #include <linux/devfreq.h>
 #include <linux/devfreq-event.h>
 #include <linux/interrupt.h>
+#include <linux/mfd/syscon.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/pm_opp.h>
+#include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
 #include <linux/rwsem.h>
 #include <linux/suspend.h>
 
+#include <soc/rockchip/rk3399_grf.h>
 #include <soc/rockchip/rockchip_sip.h>
 
 struct dram_timing {
@@ -69,8 +72,11 @@  struct rk3399_dmcfreq {
 	struct mutex lock;
 	struct dram_timing timing;
 	struct regulator *vdd_center;
+	struct regmap *regmap_pmu;
 	unsigned long rate, target_rate;
 	unsigned long volt, target_volt;
+	unsigned int odt_dis_freq;
+	int odt_pd_arg0, odt_pd_arg1;
 };
 
 static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
@@ -80,6 +86,8 @@  static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
 	struct dev_pm_opp *opp;
 	unsigned long old_clk_rate = dmcfreq->rate;
 	unsigned long target_volt, target_rate;
+	struct arm_smccc_res res;
+	bool odt_enable = false;
 	int err;
 
 	opp = devfreq_recommended_opp(dev, freq, flags);
@@ -95,6 +103,19 @@  static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
 
 	mutex_lock(&dmcfreq->lock);
 
+	if (target_rate >= dmcfreq->odt_dis_freq)
+		odt_enable = true;
+
+	/*
+	 * This makes a SMC call to the TF-A to set the DDR PD (power-down)
+	 * timings and to enable or disable the ODT (on-die termination)
+	 * resistors.
+	 */
+	arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, dmcfreq->odt_pd_arg0,
+		      dmcfreq->odt_pd_arg1,
+		      ROCKCHIP_SIP_CONFIG_DRAM_SET_ODT_PD,
+		      odt_enable, 0, 0, 0, &res);
+
 	/*
 	 * If frequency scaling from low to high, adjust voltage first.
 	 * If frequency scaling from high to low, adjust frequency first.
@@ -294,11 +315,13 @@  static int rk3399_dmcfreq_probe(struct platform_device *pdev)
 {
 	struct arm_smccc_res res;
 	struct device *dev = &pdev->dev;
-	struct device_node *np = pdev->dev.of_node;
+	struct device_node *np = pdev->dev.of_node, *node;
 	struct rk3399_dmcfreq *data;
 	int ret, index, size;
 	uint32_t *timing;
 	struct dev_pm_opp *opp;
+	u32 ddr_type;
+	u32 val;
 
 	data = devm_kzalloc(dev, sizeof(struct rk3399_dmcfreq), GFP_KERNEL);
 	if (!data)
@@ -334,6 +357,34 @@  static int rk3399_dmcfreq_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	/* Try to find the optional reference to the pmu syscon */
+	node = of_parse_phandle(np, "rockchip,pmu", 0);
+	if (node) {
+		data->regmap_pmu = syscon_node_to_regmap(node);
+		if (IS_ERR(data->regmap_pmu))
+			return PTR_ERR(data->regmap_pmu);
+	}
+
+	/* Get DDR type */
+	regmap_read(data->regmap_pmu, RK3399_PMUGRF_OS_REG2, &val);
+	ddr_type = (val >> RK3399_PMUGRF_DDRTYPE_SHIFT) &
+		    RK3399_PMUGRF_DDRTYPE_MASK;
+
+	/* Get the odt_dis_freq parameter in function of the DDR type */
+	switch (ddr_type) {
+	case RK3399_PMUGRF_DDRTYPE_DDR3:
+		data->odt_dis_freq = data->timing.ddr3_odt_dis_freq;
+		break;
+	case RK3399_PMUGRF_DDRTYPE_LPDDR3:
+		data->odt_dis_freq = data->timing.lpddr3_odt_dis_freq;
+		break;
+	case RK3399_PMUGRF_DDRTYPE_LPDDR4:
+		data->odt_dis_freq = data->timing.lpddr4_odt_dis_freq;
+		break;
+	default:
+		return -EINVAL;
+	};
+
 	/*
 	 * Get dram timing and pass it to arm trust firmware,
 	 * the dram drvier in arm trust firmware will get these
@@ -358,6 +409,27 @@  static int rk3399_dmcfreq_probe(struct platform_device *pdev)
 		      ROCKCHIP_SIP_CONFIG_DRAM_INIT,
 		      0, 0, 0, 0, &res);
 
+	/*
+	 * In TF-A there is a platform SIP call to set the PD (power-down)
+	 * timings and to enable or disable the ODT (on-die termination).
+	 * This call needs three arguments as follows:
+	 *
+	 * arg0:
+	 *     bit[0-7]   : sr_idle
+	 *     bit[8-15]  : sr_mc_gate_idle
+	 *     bit[16-31] : standby idle
+	 * arg1:
+	 *     bit[0-11]  : pd_idle
+	 *     bit[16-27] : srpd_lite_idle
+	 * arg2:
+	 *     bit[0]     : odt enable
+	 */
+	data->odt_pd_arg0 = (data->timing.sr_idle & 0xff) |
+			    ((data->timing.sr_mc_gate_idle & 0xff) << 8) |
+			    ((data->timing.standby_idle & 0xffff) << 16);
+	data->odt_pd_arg1 = (data->timing.pd_idle & 0xfff) |
+			    ((data->timing.srpd_lite_idle & 0xfff) << 16);
+
 	/*
 	 * We add a devfreq driver to our parent since it has a device tree node
 	 * with operating points.
diff --git a/include/soc/rockchip/rockchip_sip.h b/include/soc/rockchip/rockchip_sip.h
index 7e28092c4d3d..ad9482c56797 100644
--- a/include/soc/rockchip/rockchip_sip.h
+++ b/include/soc/rockchip/rockchip_sip.h
@@ -23,5 +23,6 @@ 
 #define ROCKCHIP_SIP_CONFIG_DRAM_GET_RATE	0x05
 #define ROCKCHIP_SIP_CONFIG_DRAM_CLR_IRQ	0x06
 #define ROCKCHIP_SIP_CONFIG_DRAM_SET_PARAM	0x07
+#define ROCKCHIP_SIP_CONFIG_DRAM_SET_ODT_PD	0x08
 
 #endif