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/* $OpenBSD: amlpwm.c,v 1.1 2019/09/30 20:42:45 kettenis Exp $ */
/*
* Copyright (c) 2019 Mark Kettenis <kettenis@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <machine/intr.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_clock.h>
#include <dev/ofw/ofw_misc.h>
#include <dev/ofw/fdt.h>
#define PWM_PWM_A 0x00
#define PWM_PWM_B 0x01
#define PWM_PWM_HIGH(x) ((x) >> 16)
#define PWM_PWM_HIGH_SHIFT 16
#define PWM_PWM_LOW(x) ((x) & 0xffff)
#define PWM_PWM_LOW_SHIFT 0
#define PWM_MISC_REG_AB 0x02
#define PWM_B_CLK_EN (1 << 23)
#define PWM_B_CLK_DIV_MASK (0x7f << 16)
#define PWM_B_CLK_DIV_SHIFT 16
#define PWM_B_CLK_DIV(x) ((((x) >> 16) & 0x7f) + 1)
#define PWM_A_CLK_EN (1 << 15)
#define PWM_A_CLK_DIV_MASK (0x7f << 8)
#define PWM_A_CLK_DIV_SHIFT 8
#define PWM_A_CLK_DIV(x) ((((x) >> 8) & 0x7f) + 1)
#define PWM_B_EN (1 << 1)
#define PWM_A_EN (1 << 0)
#define HREAD4(sc, reg) \
(bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg) << 2))
#define HWRITE4(sc, reg, val) \
bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg) << 2, (val))
#define HSET4(sc, reg, bits) \
HWRITE4((sc), (reg), HREAD4((sc), (reg)) | (bits))
#define HCLR4(sc, reg, bits) \
HWRITE4((sc), (reg), HREAD4((sc), (reg)) & ~(bits))
struct amlpwm_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
uint32_t sc_clkin[2];
struct pwm_device sc_pd;
};
int amlpwm_match(struct device *, void *, void *);
void amlpwm_attach(struct device *, struct device *, void *);
struct cfattach amlpwm_ca = {
sizeof (struct amlpwm_softc), amlpwm_match, amlpwm_attach
};
struct cfdriver amlpwm_cd = {
NULL, "amlpwm", DV_DULL
};
int amlpwm_get_state(void *, uint32_t *, struct pwm_state *);
int amlpwm_set_state(void *, uint32_t *, struct pwm_state *);
int
amlpwm_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
int node = faa->fa_node;
return (OF_is_compatible(node, "amlogic,meson-g12a-ao-pwm-cd") ||
OF_is_compatible(node, "amlogic,meson-g12a-ee-pwm"));
}
void
amlpwm_attach(struct device *parent, struct device *self, void *aux)
{
struct amlpwm_softc *sc = (struct amlpwm_softc *)self;
struct fdt_attach_args *faa = aux;
if (faa->fa_nreg < 1) {
printf(": no registers\n");
return;
}
sc->sc_iot = faa->fa_iot;
if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr,
faa->fa_reg[0].size, 0, &sc->sc_ioh)) {
printf(": can't map registers\n");
return;
}
sc->sc_clkin[0] = clock_get_frequency(faa->fa_node, "clkin0");
sc->sc_clkin[1] = clock_get_frequency(faa->fa_node, "clkin1");
printf("\n");
sc->sc_pd.pd_node = faa->fa_node;
sc->sc_pd.pd_cookie = sc;
sc->sc_pd.pd_get_state = amlpwm_get_state;
sc->sc_pd.pd_set_state = amlpwm_set_state;
pwm_register(&sc->sc_pd);
}
static inline uint32_t
cycles_to_ns(uint64_t clk_freq, uint32_t clk_div, uint32_t cycles)
{
return cycles * clk_div * 1000000000ULL / clk_freq;
}
static inline uint32_t
ns_to_cycles(uint64_t clk_freq, uint32_t clk_div, uint32_t ns)
{
return ns * clk_freq / (clk_div * 1000000000ULL);
}
int
amlpwm_get_state(void *cookie, uint32_t *cells, struct pwm_state *ps)
{
struct amlpwm_softc *sc = cookie;
uint32_t idx = cells[0];
uint32_t pwm, misc;
uint32_t total, high;
uint32_t clk_div;
int enabled = 0;
if (idx > 1 || sc->sc_clkin[idx] == 0)
return EINVAL;
pwm = HREAD4(sc, idx == 0 ? PWM_PWM_A : PWM_PWM_B);
misc = HREAD4(sc, PWM_MISC_REG_AB);
if (idx == 0) {
if ((misc & PWM_A_CLK_EN) && (misc & PWM_A_EN))
enabled = 1;
clk_div = PWM_A_CLK_DIV(misc);
} else {
if ((misc & PWM_B_CLK_EN) && (misc & PWM_B_EN))
enabled = 1;
clk_div = PWM_B_CLK_DIV(misc);
}
total = PWM_PWM_LOW(pwm) + PWM_PWM_HIGH(pwm);
high = PWM_PWM_HIGH(pwm);
memset(ps, 0, sizeof(struct pwm_state));
ps->ps_period = cycles_to_ns(sc->sc_clkin[idx], clk_div, total);
ps->ps_pulse_width = cycles_to_ns(sc->sc_clkin[idx], clk_div, high);
ps->ps_enabled = enabled;
return 0;
}
int
amlpwm_set_state(void *cookie, uint32_t *cells, struct pwm_state *ps)
{
struct amlpwm_softc *sc = cookie;
uint32_t idx = cells[0];
uint32_t pwm, misc;
uint32_t total, high, low;
uint32_t clk_div = 1;
if (idx > 1 || sc->sc_clkin[idx] == 0)
return EINVAL;
/* Hardware doesn't support polarity inversion. */
if (ps->ps_flags & PWM_POLARITY_INVERTED)
return EINVAL;
if (!ps->ps_enabled) {
HCLR4(sc, PWM_MISC_REG_AB, (idx == 0) ? PWM_A_EN : PWM_B_EN);
return 0;
}
total = ns_to_cycles(sc->sc_clkin[idx], clk_div, ps->ps_period);
while ((total / clk_div) > 0xffff)
clk_div++;
if (clk_div > 128)
return EINVAL;
total = ns_to_cycles(sc->sc_clkin[idx], clk_div, ps->ps_period);
high = ns_to_cycles(sc->sc_clkin[idx], clk_div, ps->ps_pulse_width);
low = total - high;
pwm = (high << PWM_PWM_HIGH_SHIFT) | (low << PWM_PWM_LOW_SHIFT);
misc = HREAD4(sc, PWM_MISC_REG_AB);
if (idx == 0) {
misc &= ~PWM_A_CLK_DIV_MASK;
misc |= (clk_div - 1) << PWM_A_CLK_DIV_SHIFT;
misc |= PWM_A_CLK_EN;
} else {
misc &= ~PWM_B_CLK_DIV_MASK;
misc |= (clk_div - 1) << PWM_B_CLK_DIV_SHIFT;
misc |= PWM_B_CLK_EN;
}
HWRITE4(sc, PWM_MISC_REG_AB, misc);
HWRITE4(sc, (idx == 0) ? PWM_PWM_A : PWM_PWM_B, pwm);
HSET4(sc, PWM_MISC_REG_AB, (idx == 0) ? PWM_A_EN : PWM_B_EN);
return 0;
}
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