rockchip/rk3288: refactor pwm driver

3288 and 3399 use the same pwm controller.

With this patch in place it is easy to add support for 3399.

BRANCH=none
BUG=none
TEST=booted veyron_jerry to kernel login prompt

Change-Id: If8f5697b4003d078b46de3fa3cebad6c8310a688
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: acf6132619167743c0c991b75f0f49c8d0e51ca7
Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Change-Id: I79428f9ec71017ad8f3ad67dac1468178ccc3a1e
Original-Reviewed-on: https://chromium-review.googlesource.com/338019
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/14336
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/soc/rockchip/common/pwm.c

@@ -0,0 +1,86 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Rockchip Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <arch/io.h>
+#include <assert.h>
+#include <console/console.h>
+#include <delay.h>
+#include <soc/addressmap.h>
+#include <soc/grf.h>
+#include <soc/soc.h>
+#include <soc/pwm.h>
+#include <soc/clock.h>
+#include <stdlib.h>
+#include <timer.h>
+
+struct pwm_ctl {
+	u32	pwm_cnt;
+	u32	pwm_period_hpr;
+	u32	pwm_duty_lpr;
+	u32	pwm_ctrl;
+};
+
+struct rk_pwm_regs {
+	struct pwm_ctl pwm[4];
+	u32	intsts;
+	u32	int_en;
+};
+check_member(rk_pwm_regs, int_en, 0x44);
+
+#define RK_PWM_DISABLE                  (0 << 0)
+#define RK_PWM_ENABLE                   (1 << 0)
+
+
+#define PWM_ONE_SHOT                    (0 << 1)
+#define PWM_CONTINUOUS                  (1 << 1)
+#define RK_PWM_CAPTURE                  (1 << 2)
+
+#define PWM_DUTY_POSTIVE                (1 << 3)
+#define PWM_DUTY_NEGATIVE               (0 << 3)
+
+#define PWM_INACTIVE_POSTIVE            (1 << 4)
+#define PWM_INACTIVE_NEGATIVE           (0 << 4)
+
+#define PWM_OUTPUT_LEFT                 (0 << 5)
+#define PWM_OUTPUT_CENTER               (1 << 5)
+
+#define PWM_LP_ENABLE                   (1 << 8)
+#define PWM_LP_DISABLE                  (0 << 8)
+
+#define PWM_SEL_SCALE_CLK			(1 << 9)
+#define PWM_SEL_SRC_CLK				(0 << 9)
+
+struct rk_pwm_regs *rk_pwm = (void *)RK_PWM_BASE;
+
+void pwm_init(u32 id, u32 period_ns, u32 duty_ns)
+{
+	unsigned long period, duty;
+
+#if IS_ENABLED(CONFIG_SOC_ROCKCHIP_RK3288)
+	/*use rk pwm*/
+	write32(&rk3288_grf->soc_con2, RK_SETBITS(1 << 0));
+#endif
+
+	write32(&rk_pwm->pwm[id].pwm_ctrl, PWM_SEL_SRC_CLK |
+		PWM_OUTPUT_LEFT | PWM_LP_DISABLE | PWM_CONTINUOUS |
+		PWM_DUTY_POSTIVE | PWM_INACTIVE_POSTIVE | RK_PWM_DISABLE);
+
+	period = (PWM_CLOCK_HZ / 1000) * period_ns / USECS_PER_SEC;
+	duty = (PWM_CLOCK_HZ / 1000) * duty_ns / USECS_PER_SEC;
+
+	write32(&rk_pwm->pwm[id].pwm_period_hpr, period);
+	write32(&rk_pwm->pwm[id].pwm_duty_lpr, duty);
+	setbits_le32(&rk_pwm->pwm[id].pwm_ctrl, RK_PWM_ENABLE);
+}