[PATCH 3/4] spi: fsl-espi: align register access with other drivers

[Heiner Kallweit <hkallweit1@xxxxxxxxx>]

Change register access to the method used in other drivers too.
- use register names as in the chip spec for constants
- avoid hard to read statements like
  __be32 __iomem *espi_mode = &reg_base->mode
- get rid of old powerpc-specific functions like in_8

In addition annotate reg_base in struct mpc8xxx_spi as __iomem.

Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
---
 drivers/spi/spi-fsl-espi.c | 135 ++++++++++++++++++++++++---------------------
 drivers/spi/spi-fsl-lib.h  |   2 +-
 2 files changed, 73 insertions(+), 64 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 032bf3a..328b04a 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -26,16 +26,15 @@
 #include "spi-fsl-lib.h"
 
 /* eSPI Controller registers */
-struct fsl_espi_reg {
-	__be32 mode;		/* 0x000 - eSPI mode register */
-	__be32 event;		/* 0x004 - eSPI event register */
-	__be32 mask;		/* 0x008 - eSPI mask register */
-	__be32 command;		/* 0x00c - eSPI command register */
-	__be32 transmit;	/* 0x010 - eSPI transmit FIFO access register*/
-	__be32 receive;		/* 0x014 - eSPI receive FIFO access register*/
-	u8 res[8];		/* 0x018 - 0x01c reserved */
-	__be32 csmode[4];	/* 0x020 - 0x02c eSPI cs mode register */
-};
+#define ESPI_SPMODE	0x00	/* eSPI mode register */
+#define ESPI_SPIE	0x04	/* eSPI event register */
+#define ESPI_SPIM	0x08	/* eSPI mask register */
+#define ESPI_SPCOM	0x0c	/* eSPI command register */
+#define ESPI_SPITF	0x10	/* eSPI transmit FIFO access register*/
+#define ESPI_SPIRF	0x14	/* eSPI receive FIFO access register*/
+#define ESPI_SPMODE0	0x20	/* eSPI cs0 mode register */
+
+#define ESPI_SPMODEx(x)	(ESPI_SPMODE0 + (x) * 4)
 
 /* eSPI Controller mode register definitions */
 #define SPMODE_ENABLE		(1 << 31)
@@ -77,6 +76,28 @@ struct fsl_espi_reg {
 
 #define AUTOSUSPEND_TIMEOUT 2000
 
+static inline u32 fsl_espi_read_reg(struct mpc8xxx_spi *mspi, int offset)
+{
+	return ioread32be(mspi->reg_base + offset);
+}
+
+static inline u8 fsl_espi_read_reg8(struct mpc8xxx_spi *mspi, int offset)
+{
+	return ioread8(mspi->reg_base + offset);
+}
+
+static inline void fsl_espi_write_reg(struct mpc8xxx_spi *mspi, int offset,
+				      u32 val)
+{
+	iowrite32be(val, mspi->reg_base + offset);
+}
+
+static inline void fsl_espi_write_reg8(struct mpc8xxx_spi *mspi, int offset,
+				       u8 val)
+{
+	iowrite8(val, mspi->reg_base + offset);
+}
+
 static void fsl_espi_copy_to_buf(struct spi_message *m,
 				 struct mpc8xxx_spi *mspi)
 {
@@ -133,9 +154,6 @@ static void fsl_espi_change_mode(struct spi_device *spi)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
 	struct spi_mpc8xxx_cs *cs = spi->controller_state;
-	struct fsl_espi_reg *reg_base = mspi->reg_base;
-	__be32 __iomem *mode = &reg_base->csmode[spi->chip_select];
-	__be32 __iomem *espi_mode = &reg_base->mode;
 	u32 tmp;
 	unsigned long flags;
 
@@ -143,10 +161,11 @@ static void fsl_espi_change_mode(struct spi_device *spi)
 	local_irq_save(flags);
 
 	/* Turn off SPI unit prior changing mode */
-	tmp = mpc8xxx_spi_read_reg(espi_mode);
-	mpc8xxx_spi_write_reg(espi_mode, tmp & ~SPMODE_ENABLE);
-	mpc8xxx_spi_write_reg(mode, cs->hw_mode);
-	mpc8xxx_spi_write_reg(espi_mode, tmp);
+	tmp = fsl_espi_read_reg(mspi, ESPI_SPMODE);
+	fsl_espi_write_reg(mspi, ESPI_SPMODE, tmp & ~SPMODE_ENABLE);
+	fsl_espi_write_reg(mspi, ESPI_SPMODEx(spi->chip_select),
+			      cs->hw_mode);
+	fsl_espi_write_reg(mspi, ESPI_SPMODE, tmp);
 
 	local_irq_restore(flags);
 }
@@ -228,7 +247,6 @@ static void fsl_espi_setup_transfer(struct spi_device *spi,
 static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 {
 	struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
-	struct fsl_espi_reg *reg_base = mpc8xxx_spi->reg_base;
 	u32 word;
 	int ret;
 
@@ -241,15 +259,15 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	reinit_completion(&mpc8xxx_spi->done);
 
 	/* Set SPCOM[CS] and SPCOM[TRANLEN] field */
-	mpc8xxx_spi_write_reg(&reg_base->command,
+	fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPCOM,
 		(SPCOM_CS(spi->chip_select) | SPCOM_TRANLEN(t->len - 1)));
 
 	/* enable rx ints */
-	mpc8xxx_spi_write_reg(&reg_base->mask, SPIM_NE);
+	fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPIM, SPIM_NE);
 
 	/* transmit word */
 	word = mpc8xxx_spi->get_tx(mpc8xxx_spi);
-	mpc8xxx_spi_write_reg(&reg_base->transmit, word);
+	fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPITF, word);
 
 	/* Won't hang up forever, SPI bus sometimes got lost interrupts... */
 	ret = wait_for_completion_timeout(&mpc8xxx_spi->done, 2 * HZ);
@@ -259,7 +277,7 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 			mpc8xxx_spi->count);
 
 	/* disable rx ints */
-	mpc8xxx_spi_write_reg(&reg_base->mask, 0);
+	fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPIM, 0);
 
 	return mpc8xxx_spi->count > 0 ? -EMSGSIZE : 0;
 }
@@ -329,7 +347,6 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 static int fsl_espi_setup(struct spi_device *spi)
 {
 	struct mpc8xxx_spi *mpc8xxx_spi;
-	struct fsl_espi_reg *reg_base;
 	u32 hw_mode;
 	u32 loop_mode;
 	struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi);
@@ -345,13 +362,12 @@ static int fsl_espi_setup(struct spi_device *spi)
 	}
 
 	mpc8xxx_spi = spi_master_get_devdata(spi->master);
-	reg_base = mpc8xxx_spi->reg_base;
 
 	pm_runtime_get_sync(mpc8xxx_spi->dev);
 
 	hw_mode = cs->hw_mode; /* Save original settings */
-	cs->hw_mode = mpc8xxx_spi_read_reg(
-			&reg_base->csmode[spi->chip_select]);
+	cs->hw_mode = fsl_espi_read_reg(mpc8xxx_spi,
+					   ESPI_SPMODEx(spi->chip_select));
 	/* mask out bits we are going to set */
 	cs->hw_mode &= ~(CSMODE_CP_BEGIN_EDGECLK | CSMODE_CI_INACTIVEHIGH
 			 | CSMODE_REV);
@@ -364,11 +380,11 @@ static int fsl_espi_setup(struct spi_device *spi)
 		cs->hw_mode |= CSMODE_REV;
 
 	/* Handle the loop mode */
-	loop_mode = mpc8xxx_spi_read_reg(&reg_base->mode);
+	loop_mode = fsl_espi_read_reg(mpc8xxx_spi, ESPI_SPMODE);
 	loop_mode &= ~SPMODE_LOOP;
 	if (spi->mode & SPI_LOOP)
 		loop_mode |= SPMODE_LOOP;
-	mpc8xxx_spi_write_reg(&reg_base->mode, loop_mode);
+	fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPMODE, loop_mode);
 
 	fsl_espi_setup_transfer(spi, NULL);
 
@@ -388,8 +404,6 @@ static void fsl_espi_cleanup(struct spi_device *spi)
 
 static void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
 {
-	struct fsl_espi_reg *reg_base = mspi->reg_base;
-
 	/* We need handle RX first */
 	if (events & SPIE_NE) {
 		u32 rx_data, tmp;
@@ -401,7 +415,7 @@ static void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
 		if (SPIE_RXCNT(events) < min(4, mspi->len)) {
 			ret = spin_event_timeout(
 				!(SPIE_RXCNT(events =
-				mpc8xxx_spi_read_reg(&reg_base->event)) <
+				fsl_espi_read_reg(mspi, ESPI_SPIE)) <
 						min(4, mspi->len)),
 						10000, 0); /* 10 msec */
 			if (!ret)
@@ -410,7 +424,7 @@ static void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
 		}
 
 		if (mspi->len >= 4) {
-			rx_data = mpc8xxx_spi_read_reg(&reg_base->receive);
+			rx_data = fsl_espi_read_reg(mspi, ESPI_SPIRF);
 		} else if (mspi->len <= 0) {
 			dev_err(mspi->dev,
 				"unexpected RX(SPIE_NE) interrupt occurred,\n"
@@ -422,7 +436,8 @@ static void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
 			tmp = mspi->len;
 			rx_data = 0;
 			while (tmp--) {
-				rx_data_8 = in_8((u8 *)&reg_base->receive);
+				rx_data_8 = fsl_espi_read_reg8(mspi,
+							       ESPI_SPIRF);
 				rx_data |= (rx_data_8 << (tmp * 8));
 			}
 
@@ -439,8 +454,8 @@ static void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
 		int ret;
 
 		/* spin until TX is done */
-		ret = spin_event_timeout(((events = mpc8xxx_spi_read_reg(
-				&reg_base->event)) & SPIE_NF), 1000, 0);
+		ret = spin_event_timeout(((events = fsl_espi_read_reg(
+				mspi, ESPI_SPIE)) & SPIE_NF), 1000, 0);
 		if (!ret) {
 			dev_err(mspi->dev, "tired waiting for SPIE_NF\n");
 			complete(&mspi->done);
@@ -452,7 +467,7 @@ static void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
 	if (mspi->count) {
 		u32 word = mspi->get_tx(mspi);
 
-		mpc8xxx_spi_write_reg(&reg_base->transmit, word);
+		fsl_espi_write_reg(mspi, ESPI_SPITF, word);
 	} else {
 		complete(&mspi->done);
 	}
@@ -461,11 +476,10 @@ static void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
 static irqreturn_t fsl_espi_irq(s32 irq, void *context_data)
 {
 	struct mpc8xxx_spi *mspi = context_data;
-	struct fsl_espi_reg *reg_base = mspi->reg_base;
 	u32 events;
 
 	/* Get interrupt events(tx/rx) */
-	events = mpc8xxx_spi_read_reg(&reg_base->event);
+	events = fsl_espi_read_reg(mspi, ESPI_SPIE);
 	if (!events)
 		return IRQ_NONE;
 
@@ -474,7 +488,7 @@ static irqreturn_t fsl_espi_irq(s32 irq, void *context_data)
 	fsl_espi_cpu_irq(mspi, events);
 
 	/* Clear the events */
-	mpc8xxx_spi_write_reg(&reg_base->event, events);
+	fsl_espi_write_reg(mspi, ESPI_SPIE, events);
 
 	return IRQ_HANDLED;
 }
@@ -484,12 +498,11 @@ static int fsl_espi_runtime_suspend(struct device *dev)
 {
 	struct spi_master *master = dev_get_drvdata(dev);
 	struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master);
-	struct fsl_espi_reg *reg_base = mpc8xxx_spi->reg_base;
 	u32 regval;
 
-	regval = mpc8xxx_spi_read_reg(&reg_base->mode);
+	regval = fsl_espi_read_reg(mpc8xxx_spi, ESPI_SPMODE);
 	regval &= ~SPMODE_ENABLE;
-	mpc8xxx_spi_write_reg(&reg_base->mode, regval);
+	fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPMODE, regval);
 
 	return 0;
 }
@@ -498,12 +511,11 @@ static int fsl_espi_runtime_resume(struct device *dev)
 {
 	struct spi_master *master = dev_get_drvdata(dev);
 	struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master);
-	struct fsl_espi_reg *reg_base = mpc8xxx_spi->reg_base;
 	u32 regval;
 
-	regval = mpc8xxx_spi_read_reg(&reg_base->mode);
+	regval = fsl_espi_read_reg(mpc8xxx_spi, ESPI_SPMODE);
 	regval |= SPMODE_ENABLE;
-	mpc8xxx_spi_write_reg(&reg_base->mode, regval);
+	fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPMODE, regval);
 
 	return 0;
 }
@@ -520,7 +532,6 @@ static struct spi_master * fsl_espi_probe(struct device *dev,
 	struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
 	struct spi_master *master;
 	struct mpc8xxx_spi *mpc8xxx_spi;
-	struct fsl_espi_reg *reg_base;
 	struct device_node *nc;
 	const __be32 *prop;
 	u32 regval, csmode;
@@ -558,8 +569,6 @@ static struct spi_master * fsl_espi_probe(struct device *dev,
 		goto err_probe;
 	}
 
-	reg_base = mpc8xxx_spi->reg_base;
-
 	/* Register for SPI Interrupt */
 	ret = devm_request_irq(dev, mpc8xxx_spi->irq, fsl_espi_irq,
 			  0, "fsl_espi", mpc8xxx_spi);
@@ -572,10 +581,10 @@ static struct spi_master * fsl_espi_probe(struct device *dev,
 	}
 
 	/* SPI controller initializations */
-	mpc8xxx_spi_write_reg(&reg_base->mode, 0);
-	mpc8xxx_spi_write_reg(&reg_base->mask, 0);
-	mpc8xxx_spi_write_reg(&reg_base->command, 0);
-	mpc8xxx_spi_write_reg(&reg_base->event, 0xffffffff);
+	fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPMODE, 0);
+	fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPIM, 0);
+	fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPCOM, 0);
+	fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPIE, 0xffffffff);
 
 	/* Init eSPI CS mode register */
 	for_each_available_child_of_node(master->dev.of_node, nc) {
@@ -600,7 +609,7 @@ static struct spi_master * fsl_espi_probe(struct device *dev,
 			csmode &= ~(CSMODE_AFT(0xf));
 			csmode |= CSMODE_AFT(be32_to_cpup(prop));
 		}
-		mpc8xxx_spi_write_reg(&reg_base->csmode[i], csmode);
+		fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPMODEx(i), csmode);
 
 		dev_info(dev, "cs=%d, init_csmode=0x%x\n", i, csmode);
 	}
@@ -608,7 +617,7 @@ static struct spi_master * fsl_espi_probe(struct device *dev,
 	/* Enable SPI interface */
 	regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE;
 
-	mpc8xxx_spi_write_reg(&reg_base->mode, regval);
+	fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPMODE, regval);
 
 	pm_runtime_set_autosuspend_delay(dev, AUTOSUSPEND_TIMEOUT);
 	pm_runtime_use_autosuspend(dev);
@@ -620,7 +629,8 @@ static struct spi_master * fsl_espi_probe(struct device *dev,
 	if (ret < 0)
 		goto err_pm;
 
-	dev_info(dev, "at 0x%p (irq = %d)\n", reg_base, mpc8xxx_spi->irq);
+	dev_info(dev, "at 0x%p (irq = %d)\n", mpc8xxx_spi->reg_base,
+		 mpc8xxx_spi->irq);
 
 	pm_runtime_mark_last_busy(dev);
 	pm_runtime_put_autosuspend(dev);
@@ -726,27 +736,26 @@ static int of_fsl_espi_resume(struct device *dev)
 	struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
 	struct spi_master *master = dev_get_drvdata(dev);
 	struct mpc8xxx_spi *mpc8xxx_spi;
-	struct fsl_espi_reg *reg_base;
 	u32 regval;
 	int i, ret;
 
 	mpc8xxx_spi = spi_master_get_devdata(master);
-	reg_base = mpc8xxx_spi->reg_base;
 
 	/* SPI controller initializations */
-	mpc8xxx_spi_write_reg(&reg_base->mode, 0);
-	mpc8xxx_spi_write_reg(&reg_base->mask, 0);
-	mpc8xxx_spi_write_reg(&reg_base->command, 0);
-	mpc8xxx_spi_write_reg(&reg_base->event, 0xffffffff);
+	fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPMODE, 0);
+	fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPIM, 0);
+	fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPCOM, 0);
+	fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPIE, 0xffffffff);
 
 	/* Init eSPI CS mode register */
 	for (i = 0; i < pdata->max_chipselect; i++)
-		mpc8xxx_spi_write_reg(&reg_base->csmode[i], CSMODE_INIT_VAL);
+		fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPMODEx(i),
+				      CSMODE_INIT_VAL);
 
 	/* Enable SPI interface */
 	regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE;
 
-	mpc8xxx_spi_write_reg(&reg_base->mode, regval);
+	fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPMODE, regval);
 
 	ret = pm_runtime_force_resume(dev);
 	if (ret < 0)
diff --git a/drivers/spi/spi-fsl-lib.h b/drivers/spi/spi-fsl-lib.h
index 065b9db..2925c80 100644
--- a/drivers/spi/spi-fsl-lib.h
+++ b/drivers/spi/spi-fsl-lib.h
@@ -23,7 +23,7 @@
 /* SPI/eSPI Controller driver's private data. */
 struct mpc8xxx_spi {
 	struct device *dev;
-	void *reg_base;
+	void __iomem *reg_base;
 
 	/* rx & tx bufs from the spi_transfer */
 	const void *tx;
-- 
2.9.2


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