drivers/mfd/atmel-smc.c

1 // SPDX-License-Identifier: GPL-2.0-only
8  * Author: Boris Brezillon <boris.brezillon@free-electrons.com>
11 #include <linux/mfd/syscon/atmel-smc.h>
15  * atmel_smc_cs_conf_init - initialize a SMC CS conf
16  * @conf: the SMC CS conf to initialize
18  * Set all fields to 0 so that one can start defining a new config.
22 	memset(conf, 0, sizeof(*conf));  in atmel_smc_cs_conf_init()
27  * atmel_smc_cs_encode_ncycles - encode a number of MCK clk cycles in the
40  * If the @ncycles value is too big to be encoded, -ERANGE is returned and
41  * the encodedval is contains the maximum val. Otherwise, 0 is returned.
49 	unsigned int lsbmask = GENMASK(msbpos - 1, 0);  in atmel_smc_cs_encode_ncycles()
50 	unsigned int msbmask = GENMASK(msbwidth - 1, 0);  in atmel_smc_cs_encode_ncycles()
52 	int ret = 0;  in atmel_smc_cs_encode_ncycles()
58 		lsb = 0;  in atmel_smc_cs_encode_ncycles()
65 	 * We still return -ERANGE in case the caller cares.  in atmel_smc_cs_encode_ncycles()
70 		ret = -ERANGE;  in atmel_smc_cs_encode_ncycles()
79  * atmel_smc_cs_conf_set_timing - set the SMC CS conf Txx parameter to a
81  * @conf: SMC CS conf descriptor
88  * @conf->timings field at @shift position.
90  * Returns -EINVAL if shift is invalid, -ERANGE if ncycles does not fit in
91  * the field, and 0 otherwise.
104 		return -EINVAL;  in atmel_smc_cs_conf_set_timing()
110 	 * ncycles = (Txx[3] * 64) + Txx[2:0]  in atmel_smc_cs_conf_set_timing()
113 	conf->timings &= ~GENMASK(shift + 3, shift);  in atmel_smc_cs_conf_set_timing()
114 	conf->timings |= val << shift;  in atmel_smc_cs_conf_set_timing()
121  * atmel_smc_cs_conf_set_setup - set the SMC CS conf xx_SETUP parameter to a
123  * @conf: SMC CS conf descriptor
130  * @conf->setup field at @shift position.
132  * Returns -EINVAL if @shift is invalid, -ERANGE if @ncycles does not fit in
133  * the field, and 0 otherwise.
143 		return -EINVAL;  in atmel_smc_cs_conf_set_setup()
149 	 * ncycles = (128 * xx_SETUP[5]) + xx_SETUP[4:0]  in atmel_smc_cs_conf_set_setup()
152 	conf->setup &= ~GENMASK(shift + 7, shift);  in atmel_smc_cs_conf_set_setup()
153 	conf->setup |= val << shift;  in atmel_smc_cs_conf_set_setup()
160  * atmel_smc_cs_conf_set_pulse - set the SMC CS conf xx_PULSE parameter to a
162  * @conf: SMC CS conf descriptor
169  * @conf->setup field at @shift position.
171  * Returns -EINVAL if @shift is invalid, -ERANGE if @ncycles does not fit in
172  * the field, and 0 otherwise.
182 		return -EINVAL;  in atmel_smc_cs_conf_set_pulse()
188 	 * ncycles = (256 * xx_PULSE[6]) + xx_PULSE[5:0]  in atmel_smc_cs_conf_set_pulse()
191 	conf->pulse &= ~GENMASK(shift + 7, shift);  in atmel_smc_cs_conf_set_pulse()
192 	conf->pulse |= val << shift;  in atmel_smc_cs_conf_set_pulse()
199  * atmel_smc_cs_conf_set_cycle - set the SMC CS conf xx_CYCLE parameter to a
201  * @conf: SMC CS conf descriptor
208  * @conf->setup field at @shift position.
210  * Returns -EINVAL if @shift is invalid, -ERANGE if @ncycles does not fit in
211  * the field, and 0 otherwise.
220 		return -EINVAL;  in atmel_smc_cs_conf_set_cycle()
226 	 * ncycles = (xx_CYCLE[8:7] * 256) + xx_CYCLE[6:0]  in atmel_smc_cs_conf_set_cycle()
229 	conf->cycle &= ~GENMASK(shift + 15, shift);  in atmel_smc_cs_conf_set_cycle()
230 	conf->cycle |= val << shift;  in atmel_smc_cs_conf_set_cycle()
237  * atmel_smc_cs_conf_apply - apply an SMC CS conf
239  * @cs: the CS id
240  * @conf: the SMC CS conf to apply
242  * Applies an SMC CS configuration.
245 void atmel_smc_cs_conf_apply(struct regmap *regmap, int cs,  in atmel_smc_cs_conf_apply()  argument
248 	regmap_write(regmap, ATMEL_SMC_SETUP(cs), conf->setup);  in atmel_smc_cs_conf_apply()
249 	regmap_write(regmap, ATMEL_SMC_PULSE(cs), conf->pulse);  in atmel_smc_cs_conf_apply()
250 	regmap_write(regmap, ATMEL_SMC_CYCLE(cs), conf->cycle);  in atmel_smc_cs_conf_apply()
251 	regmap_write(regmap, ATMEL_SMC_MODE(cs), conf->mode);  in atmel_smc_cs_conf_apply()
256  * atmel_hsmc_cs_conf_apply - apply an SMC CS conf
258  * @cs: the CS id
260  * @conf: the SMC CS conf to apply
262  * Applies an SMC CS configuration.
263  * Only valid on post-sama5 SoCs.
267 			      int cs, const struct atmel_smc_cs_conf *conf)  in atmel_hsmc_cs_conf_apply()  argument
269 	regmap_write(regmap, ATMEL_HSMC_SETUP(layout, cs), conf->setup);  in atmel_hsmc_cs_conf_apply()
270 	regmap_write(regmap, ATMEL_HSMC_PULSE(layout, cs), conf->pulse);  in atmel_hsmc_cs_conf_apply()
271 	regmap_write(regmap, ATMEL_HSMC_CYCLE(layout, cs), conf->cycle);  in atmel_hsmc_cs_conf_apply()
272 	regmap_write(regmap, ATMEL_HSMC_TIMINGS(layout, cs), conf->timings);  in atmel_hsmc_cs_conf_apply()
273 	regmap_write(regmap, ATMEL_HSMC_MODE(layout, cs), conf->mode);  in atmel_hsmc_cs_conf_apply()
278  * atmel_smc_cs_conf_get - retrieve the current SMC CS conf
280  * @cs: the CS id
281  * @conf: the SMC CS conf object to store the current conf
283  * Retrieve the SMC CS configuration.
286 void atmel_smc_cs_conf_get(struct regmap *regmap, int cs,  in atmel_smc_cs_conf_get()  argument
289 	regmap_read(regmap, ATMEL_SMC_SETUP(cs), &conf->setup);  in atmel_smc_cs_conf_get()
290 	regmap_read(regmap, ATMEL_SMC_PULSE(cs), &conf->pulse);  in atmel_smc_cs_conf_get()
291 	regmap_read(regmap, ATMEL_SMC_CYCLE(cs), &conf->cycle);  in atmel_smc_cs_conf_get()
292 	regmap_read(regmap, ATMEL_SMC_MODE(cs), &conf->mode);  in atmel_smc_cs_conf_get()
297  * atmel_hsmc_cs_conf_get - retrieve the current SMC CS conf
299  * @cs: the CS id
301  * @conf: the SMC CS conf object to store the current conf
303  * Retrieve the SMC CS configuration.
304  * Only valid on post-sama5 SoCs.
308 			    int cs, struct atmel_smc_cs_conf *conf)  in atmel_hsmc_cs_conf_get()  argument
310 	regmap_read(regmap, ATMEL_HSMC_SETUP(layout, cs), &conf->setup);  in atmel_hsmc_cs_conf_get()
311 	regmap_read(regmap, ATMEL_HSMC_PULSE(layout, cs), &conf->pulse);  in atmel_hsmc_cs_conf_get()
312 	regmap_read(regmap, ATMEL_HSMC_CYCLE(layout, cs), &conf->cycle);  in atmel_hsmc_cs_conf_get()
313 	regmap_read(regmap, ATMEL_HSMC_TIMINGS(layout, cs), &conf->timings);  in atmel_hsmc_cs_conf_get()
314 	regmap_read(regmap, ATMEL_HSMC_MODE(layout, cs), &conf->mode);  in atmel_hsmc_cs_conf_get()
319 	.timing_regs_offset = 0x600,
323 	.timing_regs_offset = 0x700,
327 	{ .compatible = "atmel,at91sam9260-smc", .data = NULL },
328 	{ .compatible = "atmel,sama5d3-smc", .data = &sama5d3_reg_layout },
329 	{ .compatible = "atmel,sama5d2-smc", .data = &sama5d2_reg_layout },
334  * atmel_hsmc_get_reg_layout - retrieve the layout of HSMC registers
340  * in HSMC case, otherwise ERR_PTR(-EINVAL).
349 	return match ? match->data : ERR_PTR(-EINVAL);  in atmel_hsmc_get_reg_layout()