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Subject[PATCH v8 08/12] thermal: qoriq: Convert driver to use regmap API
Date
Convert driver to use regmap API, drop custom LE/BE IO helpers and
simplify bit manipulation using regmap_update_bits(). This also allows
us to convert some register initialization to use loops and adds
convenient debug access to TMU registers via debugfs.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Tested-by: Lucas Stach <l.stach@pengutronix.de>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Eduardo Valentin <edubezval@gmail.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Angus Ainslie (Purism) <angus@akkea.ca>
Cc: linux-imx@nxp.com
Cc: linux-pm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---

Yuantian, Anson:

I don't have access to Layerscape HW that has v2 register layout, so
if you could give this patch a try and verify that I got the
'qoriq_yes_ranges' right, I'd really appreciate it.

Thanks,
Andrey Smirnov

drivers/thermal/qoriq_thermal.c | 228 ++++++++++++++------------------
1 file changed, 98 insertions(+), 130 deletions(-)

diff --git a/drivers/thermal/qoriq_thermal.c b/drivers/thermal/qoriq_thermal.c
index 11749c673b3b..6227c940b9b0 100644
--- a/drivers/thermal/qoriq_thermal.c
+++ b/drivers/thermal/qoriq_thermal.c
@@ -9,6 +9,7 @@
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
+#include <linux/regmap.h>
#include <linux/thermal.h>

#include "thermal_core.h"
@@ -24,85 +25,35 @@
#define TMU_VER1 0x1
#define TMU_VER2 0x2

-/*
- * QorIQ TMU Registers
- */
-struct qoriq_tmu_site_regs {
- u32 tritsr; /* Immediate Temperature Site Register */
- u32 tratsr; /* Average Temperature Site Register */
- u8 res0[0x8];
-};
+#define REGS_TMR 0x000 /* Mode Register */
+#define TMR_DISABLE 0x0
+#define TMR_ME 0x80000000
+#define TMR_ALPF 0x0c000000

-struct qoriq_tmu_regs_v1 {
- u32 tmr; /* Mode Register */
- u32 tsr; /* Status Register */
- u32 tmtmir; /* Temperature measurement interval Register */
- u8 res0[0x14];
- u32 tier; /* Interrupt Enable Register */
- u32 tidr; /* Interrupt Detect Register */
- u32 tiscr; /* Interrupt Site Capture Register */
- u32 ticscr; /* Interrupt Critical Site Capture Register */
- u8 res1[0x10];
- u32 tmhtcrh; /* High Temperature Capture Register */
- u32 tmhtcrl; /* Low Temperature Capture Register */
- u8 res2[0x8];
- u32 tmhtitr; /* High Temperature Immediate Threshold */
- u32 tmhtatr; /* High Temperature Average Threshold */
- u32 tmhtactr; /* High Temperature Average Crit Threshold */
- u8 res3[0x24];
- u32 ttcfgr; /* Temperature Configuration Register */
- u32 tscfgr; /* Sensor Configuration Register */
- u8 res4[0x78];
- struct qoriq_tmu_site_regs site[SITES_MAX];
- u8 res5[0x9f8];
- u32 ipbrr0; /* IP Block Revision Register 0 */
- u32 ipbrr1; /* IP Block Revision Register 1 */
- u8 res6[0x310];
- u32 ttrcr[4]; /* Temperature Range Control Register */
-};
+#define REGS_TMTMIR 0x008 /* Temperature measurement interval Register */
+#define TMTMIR_DEFAULT 0x0000000f

-struct qoriq_tmu_regs_v2 {
- u32 tmr; /* Mode Register */
- u32 tsr; /* Status Register */
- u32 tmsr; /* monitor site register */
- u32 tmtmir; /* Temperature measurement interval Register */
- u8 res0[0x10];
- u32 tier; /* Interrupt Enable Register */
- u32 tidr; /* Interrupt Detect Register */
- u8 res1[0x8];
- u32 tiiscr; /* interrupt immediate site capture register */
- u32 tiascr; /* interrupt average site capture register */
- u32 ticscr; /* Interrupt Critical Site Capture Register */
- u32 res2;
- u32 tmhtcr; /* monitor high temperature capture register */
- u32 tmltcr; /* monitor low temperature capture register */
- u32 tmrtrcr; /* monitor rising temperature rate capture register */
- u32 tmftrcr; /* monitor falling temperature rate capture register */
- u32 tmhtitr; /* High Temperature Immediate Threshold */
- u32 tmhtatr; /* High Temperature Average Threshold */
- u32 tmhtactr; /* High Temperature Average Crit Threshold */
- u32 res3;
- u32 tmltitr; /* monitor low temperature immediate threshold */
- u32 tmltatr; /* monitor low temperature average threshold register */
- u32 tmltactr; /* monitor low temperature average critical threshold */
- u32 res4;
- u32 tmrtrctr; /* monitor rising temperature rate critical threshold */
- u32 tmftrctr; /* monitor falling temperature rate critical threshold*/
- u8 res5[0x8];
- u32 ttcfgr; /* Temperature Configuration Register */
- u32 tscfgr; /* Sensor Configuration Register */
- u8 res6[0x78];
- struct qoriq_tmu_site_regs site[SITES_MAX];
- u8 res7[0x9f8];
- u32 ipbrr0; /* IP Block Revision Register 0 */
- u32 ipbrr1; /* IP Block Revision Register 1 */
- u8 res8[0x300];
- u32 teumr0;
- u32 teumr1;
- u32 teumr2;
- u32 res9;
- u32 ttrcr[4]; /* Temperature Range Control Register */
-};
+#define REGS_V2_TMSR 0x008 /* monitor site register */
+
+#define REGS_V2_TMTMIR 0x00c /* Temperature measurement interval Register */
+
+#define REGS_TIER 0x020 /* Interrupt Enable Register */
+#define TIER_DISABLE 0x0
+
+
+#define REGS_TTCFGR 0x080 /* Temperature Configuration Register */
+#define REGS_TSCFGR 0x084 /* Sensor Configuration Register */
+
+#define REGS_TRITSR(n) (0x100 + 16 * (n)) /* Immediate Temperature
+ * Site Register
+ */
+#define REGS_TTRnCR(n) (0xf10 + 4 * (n)) /* Temperature Range n
+ * Control Register
+ */
+#define REGS_IPBRR(n) (0xbf8 + 4 * (n)) /* IP Block Revision
+ * Register n
+ */
+#define REGS_V2_TEUMR(n) (0xf00 + 4 * (n))

/*
* Thermal zone data
@@ -113,10 +64,8 @@ struct qoriq_sensor {

struct qoriq_tmu_data {
int ver;
- struct qoriq_tmu_regs_v1 __iomem *regs;
- struct qoriq_tmu_regs_v2 __iomem *regs_v2;
+ struct regmap *regmap;
struct clk *clk;
- bool little_endian;
struct qoriq_sensor sensor[SITES_MAX];
};

@@ -125,29 +74,13 @@ static struct qoriq_tmu_data *qoriq_sensor_to_data(struct qoriq_sensor *s)
return container_of(s, struct qoriq_tmu_data, sensor[s->id]);
}

-static void tmu_write(struct qoriq_tmu_data *p, u32 val, void __iomem *addr)
-{
- if (p->little_endian)
- iowrite32(val, addr);
- else
- iowrite32be(val, addr);
-}
-
-static u32 tmu_read(struct qoriq_tmu_data *p, void __iomem *addr)
-{
- if (p->little_endian)
- return ioread32(addr);
- else
- return ioread32be(addr);
-}
-
static int tmu_get_temp(void *p, int *temp)
{
struct qoriq_sensor *qsensor = p;
struct qoriq_tmu_data *qdata = qoriq_sensor_to_data(qsensor);
u32 val;

- val = tmu_read(qdata, &qdata->regs->site[qsensor->id].tritsr);
+ regmap_read(qdata->regmap, REGS_TRITSR(qsensor->id), &val);
*temp = (val & 0xff) * 1000;

return 0;
@@ -189,12 +122,12 @@ static int qoriq_tmu_register_tmu_zone(struct device *dev,
/* Enable monitoring */
if (sites != 0) {
if (qdata->ver == TMU_VER1) {
- tmu_write(qdata, sites | TMR_ME | TMR_ALPF,
- &qdata->regs->tmr);
+ regmap_write(qdata->regmap, REGS_TMR,
+ sites | TMR_ME | TMR_ALPF);
} else {
- tmu_write(qdata, sites, &qdata->regs_v2->tmsr);
- tmu_write(qdata, TMR_ME | TMR_ALPF_V2,
- &qdata->regs_v2->tmr);
+ regmap_write(qdata->regmap, REGS_V2_TMSR, sites);
+ regmap_write(qdata->regmap, REGS_TMR,
+ TMR_ME | TMR_ALPF_V2);
}
}

@@ -223,7 +156,7 @@ static int qoriq_tmu_calibration(struct device *dev,

/* Init temperature range registers */
for (i = 0; i < len; i++)
- tmu_write(data, range[i], &data->regs->ttrcr[i]);
+ regmap_write(data->regmap, REGS_TTRnCR(i), range[i]);

calibration = of_get_property(np, "fsl,tmu-calibration", &len);
if (calibration == NULL || len % 8) {
@@ -233,9 +166,9 @@ static int qoriq_tmu_calibration(struct device *dev,

for (i = 0; i < len; i += 8, calibration += 2) {
val = of_read_number(calibration, 1);
- tmu_write(data, val, &data->regs->ttcfgr);
+ regmap_write(data->regmap, REGS_TTCFGR, val);
val = of_read_number(calibration + 1, 1);
- tmu_write(data, val, &data->regs->tscfgr);
+ regmap_write(data->regmap, REGS_TSCFGR, val);
}

return 0;
@@ -244,20 +177,40 @@ static int qoriq_tmu_calibration(struct device *dev,
static void qoriq_tmu_init_device(struct qoriq_tmu_data *data)
{
/* Disable interrupt, using polling instead */
- tmu_write(data, TIER_DISABLE, &data->regs->tier);
+ regmap_write(data->regmap, REGS_TIER, TIER_DISABLE);

/* Set update_interval */
+
if (data->ver == TMU_VER1) {
- tmu_write(data, TMTMIR_DEFAULT, &data->regs->tmtmir);
+ regmap_write(data->regmap, REGS_TMTMIR, TMTMIR_DEFAULT);
} else {
- tmu_write(data, TMTMIR_DEFAULT, &data->regs_v2->tmtmir);
- tmu_write(data, TEUMR0_V2, &data->regs_v2->teumr0);
+ regmap_write(data->regmap, REGS_V2_TMTMIR, TMTMIR_DEFAULT);
+ regmap_write(data->regmap, REGS_V2_TEUMR(0), TEUMR0_V2);
}

/* Disable monitoring */
- tmu_write(data, TMR_DISABLE, &data->regs->tmr);
+ regmap_write(data->regmap, REGS_TMR, TMR_DISABLE);
}

+static const struct regmap_range qoriq_yes_ranges[] = {
+ regmap_reg_range(REGS_TMR, REGS_TSCFGR),
+ regmap_reg_range(REGS_TTRnCR(0), REGS_TTRnCR(3)),
+ regmap_reg_range(REGS_V2_TEUMR(0), REGS_V2_TEUMR(2)),
+ regmap_reg_range(REGS_IPBRR(0), REGS_IPBRR(1)),
+ /* Read only registers below */
+ regmap_reg_range(REGS_TRITSR(0), REGS_TRITSR(15)),
+};
+
+static const struct regmap_access_table qoriq_wr_table = {
+ .yes_ranges = qoriq_yes_ranges,
+ .n_yes_ranges = ARRAY_SIZE(qoriq_yes_ranges) - 1,
+};
+
+static const struct regmap_access_table qoriq_rd_table = {
+ .yes_ranges = qoriq_yes_ranges,
+ .n_yes_ranges = ARRAY_SIZE(qoriq_yes_ranges),
+};
+
static int qoriq_tmu_probe(struct platform_device *pdev)
{
int ret;
@@ -265,18 +218,37 @@ static int qoriq_tmu_probe(struct platform_device *pdev)
struct qoriq_tmu_data *data;
struct device_node *np = pdev->dev.of_node;
struct device *dev = &pdev->dev;
+ const bool little_endian = of_property_read_bool(np, "little-endian");
+ const enum regmap_endian format_endian =
+ little_endian ? REGMAP_ENDIAN_LITTLE : REGMAP_ENDIAN_BIG;
+ const struct regmap_config regmap_config = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = 4,
+ .rd_table = &qoriq_rd_table,
+ .wr_table = &qoriq_wr_table,
+ .val_format_endian = format_endian,
+ .max_register = SZ_4K,
+ };
+ void __iomem *base;

data = devm_kzalloc(dev, sizeof(struct qoriq_tmu_data),
GFP_KERNEL);
if (!data)
return -ENOMEM;

- data->little_endian = of_property_read_bool(np, "little-endian");
-
- data->regs = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(data->regs)) {
+ base = devm_platform_ioremap_resource(pdev, 0);
+ ret = PTR_ERR_OR_ZERO(base);
+ if (ret) {
dev_err(dev, "Failed to get memory region\n");
- return PTR_ERR(data->regs);
+ return ret;
+ }
+
+ data->regmap = devm_regmap_init_mmio(dev, base, &regmap_config);
+ ret = PTR_ERR_OR_ZERO(data->regmap);
+ if (ret) {
+ dev_err(dev, "Failed to init regmap (%d)\n", ret);
+ return ret;
}

data->clk = devm_clk_get_optional(dev, NULL);
@@ -290,10 +262,12 @@ static int qoriq_tmu_probe(struct platform_device *pdev)
}

/* version register offset at: 0xbf8 on both v1 and v2 */
- ver = tmu_read(data, &data->regs->ipbrr0);
+ ret = regmap_read(data->regmap, REGS_IPBRR(0), &ver);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to read IP block version\n");
+ return ret;
+ }
data->ver = (ver >> 8) & 0xff;
- if (data->ver == TMU_VER2)
- data->regs_v2 = (void __iomem *)data->regs;

qoriq_tmu_init_device(data); /* TMU initialization */

@@ -323,7 +297,7 @@ static int qoriq_tmu_remove(struct platform_device *pdev)
struct qoriq_tmu_data *data = platform_get_drvdata(pdev);

/* Disable monitoring */
- tmu_write(data, TMR_DISABLE, &data->regs->tmr);
+ regmap_write(data->regmap, REGS_TMR, TMR_DISABLE);

clk_disable_unprepare(data->clk);

@@ -332,13 +306,12 @@ static int qoriq_tmu_remove(struct platform_device *pdev)

static int __maybe_unused qoriq_tmu_suspend(struct device *dev)
{
- u32 tmr;
struct qoriq_tmu_data *data = dev_get_drvdata(dev);
+ int ret;

- /* Disable monitoring */
- tmr = tmu_read(data, &data->regs->tmr);
- tmr &= ~TMR_ME;
- tmu_write(data, tmr, &data->regs->tmr);
+ ret = regmap_update_bits(data->regmap, REGS_TMR, TMR_ME, 0);
+ if (ret)
+ return ret;

clk_disable_unprepare(data->clk);

@@ -347,7 +320,6 @@ static int __maybe_unused qoriq_tmu_suspend(struct device *dev)

static int __maybe_unused qoriq_tmu_resume(struct device *dev)
{
- u32 tmr;
int ret;
struct qoriq_tmu_data *data = dev_get_drvdata(dev);

@@ -356,11 +328,7 @@ static int __maybe_unused qoriq_tmu_resume(struct device *dev)
return ret;

/* Enable monitoring */
- tmr = tmu_read(data, &data->regs->tmr);
- tmr |= TMR_ME;
- tmu_write(data, tmr, &data->regs->tmr);
-
- return 0;
+ return regmap_update_bits(data->regmap, REGS_TMR, TMR_ME, TMR_ME);
}

static SIMPLE_DEV_PM_OPS(qoriq_tmu_pm_ops,
--
2.21.0
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