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Subject[PATCH v7 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
---
drivers/thermal/qoriq_thermal.c | 153 +++++++++++++++-----------------
1 file changed, 72 insertions(+), 81 deletions(-)

diff --git a/drivers/thermal/qoriq_thermal.c b/drivers/thermal/qoriq_thermal.c
index 8a28a4433d44..32bf5ed57f5c 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"
@@ -18,48 +19,27 @@
/*
* QorIQ TMU Registers
*/
-struct qoriq_tmu_site_regs {
- u32 tritsr; /* Immediate Temperature Site Register */
- u32 tratsr; /* Average Temperature Site Register */
- u8 res0[0x8];
-};

-struct qoriq_tmu_regs {
- u32 tmr; /* Mode Register */
+#define REGS_TMR 0x000 /* Mode Register */
#define TMR_DISABLE 0x0
#define TMR_ME 0x80000000
#define TMR_ALPF 0x0c000000
- u32 tsr; /* Status Register */
- u32 tmtmir; /* Temperature measurement interval Register */
+
+#define REGS_TMTMIR 0x008 /* Temperature measurement interval Register */
#define TMTMIR_DEFAULT 0x0000000f
- u8 res0[0x14];
- u32 tier; /* Interrupt Enable Register */
+
+#define REGS_TIER 0x020 /* Interrupt Enable Register */
#define TIER_DISABLE 0x0
- 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 ttr0cr; /* Temperature Range 0 Control Register */
- u32 ttr1cr; /* Temperature Range 1 Control Register */
- u32 ttr2cr; /* Temperature Range 2 Control Register */
- u32 ttr3cr; /* Temperature Range 3 Control Register */
-};

+#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
+ */
/*
* Thermal zone data
*/
@@ -68,9 +48,8 @@ struct qoriq_sensor {
};

struct qoriq_tmu_data {
- struct qoriq_tmu_regs __iomem *regs;
+ struct regmap *regmap;
struct clk *clk;
- bool little_endian;
struct qoriq_sensor sensor[SITES_MAX];
};

@@ -79,29 +58,13 @@ 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;
@@ -139,7 +102,8 @@ static int qoriq_tmu_register_tmu_zone(struct device *dev,

/* Enable monitoring */
if (sites != 0)
- tmu_write(qdata, sites | TMR_ME | TMR_ALPF, &qdata->regs->tmr);
+ regmap_write(qdata->regmap, REGS_TMR,
+ sites | TMR_ME | TMR_ALPF);

return 0;
}
@@ -158,10 +122,8 @@ static int qoriq_tmu_calibration(struct device *dev,
}

/* Init temperature range registers */
- tmu_write(data, range[0], &data->regs->ttr0cr);
- tmu_write(data, range[1], &data->regs->ttr1cr);
- tmu_write(data, range[2], &data->regs->ttr2cr);
- tmu_write(data, range[3], &data->regs->ttr3cr);
+ for (i = 0; i < ARRAY_SIZE(range); i++)
+ regmap_write(data->regmap, REGS_TTRnCR(i), range[i]);

calibration = of_get_property(np, "fsl,tmu-calibration", &len);
if (calibration == NULL || len % 8) {
@@ -171,9 +133,9 @@ 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;
@@ -182,33 +144,68 @@ 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 */
- tmu_write(data, TMTMIR_DEFAULT, &data->regs->tmtmir);
+ regmap_write(data->regmap, REGS_TMTMIR, TMTMIR_DEFAULT);

/* 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)),
+ /* 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;
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);
+ if (IS_ERR(base)) {
dev_err(dev, "Failed to get memory region\n");
- return PTR_ERR(data->regs);
+ return PTR_ERR(base);
+ }
+
+ 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);
@@ -249,7 +246,7 @@ 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);

@@ -258,13 +255,12 @@ 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);

@@ -273,7 +269,6 @@ 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);

@@ -282,11 +277,7 @@ 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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