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
27  * atmel_smc_cs_encode_ncycles - encode a number of MCK clk cycles in the
36  * (section "SMC Setup/Pulse/Cycle/Timings Register"). This is a generic
40  * If the @ncycles value is too big to be encoded, -ERANGE is returned and
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()
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
88  * @conf->timings field at @shift position.
90  * Returns -EINVAL if shift is invalid, -ERANGE if ncycles does not fit in
104 		return -EINVAL;  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
130  * @conf->setup field at @shift position.
132  * Returns -EINVAL if @shift is invalid, -ERANGE if @ncycles does not fit in
143 		return -EINVAL;  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
169  * @conf->setup field at @shift position.
171  * Returns -EINVAL if @shift is invalid, -ERANGE if @ncycles does not fit in
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()
190 	ret = atmel_smc_cs_encode_ncycles(ncycles, 6, 1, 256, &val);  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
202  * @shift: the position of the xx_CYCLE field in the CYCLE register
207  * (section "SMC Cycle Register"), and then stores the result in the
208  * @conf->setup field at @shift position.
210  * Returns -EINVAL if @shift is invalid, -ERANGE if @ncycles does not fit in
220 		return -EINVAL;  in atmel_smc_cs_conf_set_cycle()
223 	 * The formula described in atmel datasheets (section "SMC Cycle  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
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
263  * Only valid on post-sama5 SoCs.
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
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
304  * Only valid on post-sama5 SoCs.
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()
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()