Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 351 insertions, 0 deletions

diff --git a/drivers/mfd/atmel-smc.c b/drivers/mfd/atmel-smc.c
new file mode 100644
index 000000000..f3bad2b52
--- /dev/null
+++ b/drivers/mfd/atmel-smc.c
@@ -0,0 +1,351 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Atmel SMC (Static Memory Controller) helper functions.
+ *
+ * Copyright (C) 2017 Atmel
+ * Copyright (C) 2017 Free Electrons
+ *
+ * Author: Boris Brezillon <boris.brezillon@free-electrons.com>
+ */
+
+#include <linux/mfd/syscon/atmel-smc.h>
+#include <linux/string.h>
+
+/**
+ * atmel_smc_cs_conf_init - initialize a SMC CS conf
+ * @conf: the SMC CS conf to initialize
+ *
+ * Set all fields to 0 so that one can start defining a new config.
+ */
+void atmel_smc_cs_conf_init(struct atmel_smc_cs_conf *conf)
+{
+	memset(conf, 0, sizeof(*conf));
+}
+EXPORT_SYMBOL_GPL(atmel_smc_cs_conf_init);
+
+/**
+ * atmel_smc_cs_encode_ncycles - encode a number of MCK clk cycles in the
+ *				 format expected by the SMC engine
+ * @ncycles: number of MCK clk cycles
+ * @msbpos: position of the MSB part of the timing field
+ * @msbwidth: width of the MSB part of the timing field
+ * @msbfactor: factor applied to the MSB
+ * @encodedval: param used to store the encoding result
+ *
+ * This function encodes the @ncycles value as described in the datasheet
+ * (section "SMC Setup/Pulse/Cycle/Timings Register"). This is a generic
+ * helper which called with different parameter depending on the encoding
+ * scheme.
+ *
+ * If the @ncycles value is too big to be encoded, -ERANGE is returned and
+ * the encodedval is contains the maximum val. Otherwise, 0 is returned.
+ */
+static int atmel_smc_cs_encode_ncycles(unsigned int ncycles,
+				       unsigned int msbpos,
+				       unsigned int msbwidth,
+				       unsigned int msbfactor,
+				       unsigned int *encodedval)
+{
+	unsigned int lsbmask = GENMASK(msbpos - 1, 0);
+	unsigned int msbmask = GENMASK(msbwidth - 1, 0);
+	unsigned int msb, lsb;
+	int ret = 0;
+
+	msb = ncycles / msbfactor;
+	lsb = ncycles % msbfactor;
+
+	if (lsb > lsbmask) {
+		lsb = 0;
+		msb++;
+	}
+
+	/*
+	 * Let's just put the maximum we can if the requested setting does
+	 * not fit in the register field.
+	 * We still return -ERANGE in case the caller cares.
+	 */
+	if (msb > msbmask) {
+		msb = msbmask;
+		lsb = lsbmask;
+		ret = -ERANGE;
+	}
+
+	*encodedval = (msb << msbpos) | lsb;
+
+	return ret;
+}
+
+/**
+ * atmel_smc_cs_conf_set_timing - set the SMC CS conf Txx parameter to a
+ *				  specific value
+ * @conf: SMC CS conf descriptor
+ * @shift: the position of the Txx field in the TIMINGS register
+ * @ncycles: value (expressed in MCK clk cycles) to assign to this Txx
+ *	     parameter
+ *
+ * This function encodes the @ncycles value as described in the datasheet
+ * (section "SMC Timings Register"), and then stores the result in the
+ * @conf->timings field at @shift position.
+ *
+ * Returns -EINVAL if shift is invalid, -ERANGE if ncycles does not fit in
+ * the field, and 0 otherwise.
+ */
+int atmel_smc_cs_conf_set_timing(struct atmel_smc_cs_conf *conf,
+				 unsigned int shift, unsigned int ncycles)
+{
+	unsigned int val;
+	int ret;
+
+	if (shift != ATMEL_HSMC_TIMINGS_TCLR_SHIFT &&
+	    shift != ATMEL_HSMC_TIMINGS_TADL_SHIFT &&
+	    shift != ATMEL_HSMC_TIMINGS_TAR_SHIFT &&
+	    shift != ATMEL_HSMC_TIMINGS_TRR_SHIFT &&
+	    shift != ATMEL_HSMC_TIMINGS_TWB_SHIFT)
+		return -EINVAL;
+
+	/*
+	 * The formula described in atmel datasheets (section "HSMC Timings
+	 * Register"):
+	 *
+	 * ncycles = (Txx[3] * 64) + Txx[2:0]
+	 */
+	ret = atmel_smc_cs_encode_ncycles(ncycles, 3, 1, 64, &val);
+	conf->timings &= ~GENMASK(shift + 3, shift);
+	conf->timings |= val << shift;
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(atmel_smc_cs_conf_set_timing);
+
+/**
+ * atmel_smc_cs_conf_set_setup - set the SMC CS conf xx_SETUP parameter to a
+ *				 specific value
+ * @conf: SMC CS conf descriptor
+ * @shift: the position of the xx_SETUP field in the SETUP register
+ * @ncycles: value (expressed in MCK clk cycles) to assign to this xx_SETUP
+ *	     parameter
+ *
+ * This function encodes the @ncycles value as described in the datasheet
+ * (section "SMC Setup Register"), and then stores the result in the
+ * @conf->setup field at @shift position.
+ *
+ * Returns -EINVAL if @shift is invalid, -ERANGE if @ncycles does not fit in
+ * the field, and 0 otherwise.
+ */
+int atmel_smc_cs_conf_set_setup(struct atmel_smc_cs_conf *conf,
+				unsigned int shift, unsigned int ncycles)
+{
+	unsigned int val;
+	int ret;
+
+	if (shift != ATMEL_SMC_NWE_SHIFT && shift != ATMEL_SMC_NCS_WR_SHIFT &&
+	    shift != ATMEL_SMC_NRD_SHIFT && shift != ATMEL_SMC_NCS_RD_SHIFT)
+		return -EINVAL;
+
+	/*
+	 * The formula described in atmel datasheets (section "SMC Setup
+	 * Register"):
+	 *
+	 * ncycles = (128 * xx_SETUP[5]) + xx_SETUP[4:0]
+	 */
+	ret = atmel_smc_cs_encode_ncycles(ncycles, 5, 1, 128, &val);
+	conf->setup &= ~GENMASK(shift + 7, shift);
+	conf->setup |= val << shift;
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(atmel_smc_cs_conf_set_setup);
+
+/**
+ * atmel_smc_cs_conf_set_pulse - set the SMC CS conf xx_PULSE parameter to a
+ *				 specific value
+ * @conf: SMC CS conf descriptor
+ * @shift: the position of the xx_PULSE field in the PULSE register
+ * @ncycles: value (expressed in MCK clk cycles) to assign to this xx_PULSE
+ *	     parameter
+ *
+ * This function encodes the @ncycles value as described in the datasheet
+ * (section "SMC Pulse Register"), and then stores the result in the
+ * @conf->setup field at @shift position.
+ *
+ * Returns -EINVAL if @shift is invalid, -ERANGE if @ncycles does not fit in
+ * the field, and 0 otherwise.
+ */
+int atmel_smc_cs_conf_set_pulse(struct atmel_smc_cs_conf *conf,
+				unsigned int shift, unsigned int ncycles)
+{
+	unsigned int val;
+	int ret;
+
+	if (shift != ATMEL_SMC_NWE_SHIFT && shift != ATMEL_SMC_NCS_WR_SHIFT &&
+	    shift != ATMEL_SMC_NRD_SHIFT && shift != ATMEL_SMC_NCS_RD_SHIFT)
+		return -EINVAL;
+
+	/*
+	 * The formula described in atmel datasheets (section "SMC Pulse
+	 * Register"):
+	 *
+	 * ncycles = (256 * xx_PULSE[6]) + xx_PULSE[5:0]
+	 */
+	ret = atmel_smc_cs_encode_ncycles(ncycles, 6, 1, 256, &val);
+	conf->pulse &= ~GENMASK(shift + 7, shift);
+	conf->pulse |= val << shift;
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(atmel_smc_cs_conf_set_pulse);
+
+/**
+ * atmel_smc_cs_conf_set_cycle - set the SMC CS conf xx_CYCLE parameter to a
+ *				 specific value
+ * @conf: SMC CS conf descriptor
+ * @shift: the position of the xx_CYCLE field in the CYCLE register
+ * @ncycles: value (expressed in MCK clk cycles) to assign to this xx_CYCLE
+ *	     parameter
+ *
+ * This function encodes the @ncycles value as described in the datasheet
+ * (section "SMC Cycle Register"), and then stores the result in the
+ * @conf->setup field at @shift position.
+ *
+ * Returns -EINVAL if @shift is invalid, -ERANGE if @ncycles does not fit in
+ * the field, and 0 otherwise.
+ */
+int atmel_smc_cs_conf_set_cycle(struct atmel_smc_cs_conf *conf,
+				unsigned int shift, unsigned int ncycles)
+{
+	unsigned int val;
+	int ret;
+
+	if (shift != ATMEL_SMC_NWE_SHIFT && shift != ATMEL_SMC_NRD_SHIFT)
+		return -EINVAL;
+
+	/*
+	 * The formula described in atmel datasheets (section "SMC Cycle
+	 * Register"):
+	 *
+	 * ncycles = (xx_CYCLE[8:7] * 256) + xx_CYCLE[6:0]
+	 */
+	ret = atmel_smc_cs_encode_ncycles(ncycles, 7, 2, 256, &val);
+	conf->cycle &= ~GENMASK(shift + 15, shift);
+	conf->cycle |= val << shift;
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(atmel_smc_cs_conf_set_cycle);
+
+/**
+ * atmel_smc_cs_conf_apply - apply an SMC CS conf
+ * @regmap: the SMC regmap
+ * @cs: the CS id
+ * @conf: the SMC CS conf to apply
+ *
+ * Applies an SMC CS configuration.
+ * Only valid on at91sam9 SoCs.
+ */
+void atmel_smc_cs_conf_apply(struct regmap *regmap, int cs,
+			     const struct atmel_smc_cs_conf *conf)
+{
+	regmap_write(regmap, ATMEL_SMC_SETUP(cs), conf->setup);
+	regmap_write(regmap, ATMEL_SMC_PULSE(cs), conf->pulse);
+	regmap_write(regmap, ATMEL_SMC_CYCLE(cs), conf->cycle);
+	regmap_write(regmap, ATMEL_SMC_MODE(cs), conf->mode);
+}
+EXPORT_SYMBOL_GPL(atmel_smc_cs_conf_apply);
+
+/**
+ * atmel_hsmc_cs_conf_apply - apply an SMC CS conf
+ * @regmap: the HSMC regmap
+ * @cs: the CS id
+ * @layout: the layout of registers
+ * @conf: the SMC CS conf to apply
+ *
+ * Applies an SMC CS configuration.
+ * Only valid on post-sama5 SoCs.
+ */
+void atmel_hsmc_cs_conf_apply(struct regmap *regmap,
+			      const struct atmel_hsmc_reg_layout *layout,
+			      int cs, const struct atmel_smc_cs_conf *conf)
+{
+	regmap_write(regmap, ATMEL_HSMC_SETUP(layout, cs), conf->setup);
+	regmap_write(regmap, ATMEL_HSMC_PULSE(layout, cs), conf->pulse);
+	regmap_write(regmap, ATMEL_HSMC_CYCLE(layout, cs), conf->cycle);
+	regmap_write(regmap, ATMEL_HSMC_TIMINGS(layout, cs), conf->timings);
+	regmap_write(regmap, ATMEL_HSMC_MODE(layout, cs), conf->mode);
+}
+EXPORT_SYMBOL_GPL(atmel_hsmc_cs_conf_apply);
+
+/**
+ * atmel_smc_cs_conf_get - retrieve the current SMC CS conf
+ * @regmap: the SMC regmap
+ * @cs: the CS id
+ * @conf: the SMC CS conf object to store the current conf
+ *
+ * Retrieve the SMC CS configuration.
+ * Only valid on at91sam9 SoCs.
+ */
+void atmel_smc_cs_conf_get(struct regmap *regmap, int cs,
+			   struct atmel_smc_cs_conf *conf)
+{
+	regmap_read(regmap, ATMEL_SMC_SETUP(cs), &conf->setup);
+	regmap_read(regmap, ATMEL_SMC_PULSE(cs), &conf->pulse);
+	regmap_read(regmap, ATMEL_SMC_CYCLE(cs), &conf->cycle);
+	regmap_read(regmap, ATMEL_SMC_MODE(cs), &conf->mode);
+}
+EXPORT_SYMBOL_GPL(atmel_smc_cs_conf_get);
+
+/**
+ * atmel_hsmc_cs_conf_get - retrieve the current SMC CS conf
+ * @regmap: the HSMC regmap
+ * @cs: the CS id
+ * @layout: the layout of registers
+ * @conf: the SMC CS conf object to store the current conf
+ *
+ * Retrieve the SMC CS configuration.
+ * Only valid on post-sama5 SoCs.
+ */
+void atmel_hsmc_cs_conf_get(struct regmap *regmap,
+			    const struct atmel_hsmc_reg_layout *layout,
+			    int cs, struct atmel_smc_cs_conf *conf)
+{
+	regmap_read(regmap, ATMEL_HSMC_SETUP(layout, cs), &conf->setup);
+	regmap_read(regmap, ATMEL_HSMC_PULSE(layout, cs), &conf->pulse);
+	regmap_read(regmap, ATMEL_HSMC_CYCLE(layout, cs), &conf->cycle);
+	regmap_read(regmap, ATMEL_HSMC_TIMINGS(layout, cs), &conf->timings);
+	regmap_read(regmap, ATMEL_HSMC_MODE(layout, cs), &conf->mode);
+}
+EXPORT_SYMBOL_GPL(atmel_hsmc_cs_conf_get);
+
+static const struct atmel_hsmc_reg_layout sama5d3_reg_layout = {
+	.timing_regs_offset = 0x600,
+};
+
+static const struct atmel_hsmc_reg_layout sama5d2_reg_layout = {
+	.timing_regs_offset = 0x700,
+};
+
+static const struct of_device_id atmel_smc_ids[] = {
+	{ .compatible = "atmel,at91sam9260-smc", .data = NULL },
+	{ .compatible = "atmel,sama5d3-smc", .data = &sama5d3_reg_layout },
+	{ .compatible = "atmel,sama5d2-smc", .data = &sama5d2_reg_layout },
+	{ /* sentinel */ },
+};
+
+/**
+ * atmel_hsmc_get_reg_layout - retrieve the layout of HSMC registers
+ * @np: the HSMC regmap
+ *
+ * Retrieve the layout of HSMC registers.
+ *
+ * Returns NULL in case of SMC, a struct atmel_hsmc_reg_layout pointer
+ * in HSMC case, otherwise ERR_PTR(-EINVAL).
+ */
+const struct atmel_hsmc_reg_layout *
+atmel_hsmc_get_reg_layout(struct device_node *np)
+{
+	const struct of_device_id *match;
+
+	match = of_match_node(atmel_smc_ids, np);
+
+	return match ? match->data : ERR_PTR(-EINVAL);
+}
+EXPORT_SYMBOL_GPL(atmel_hsmc_get_reg_layout);