[U-Boot] [V3 04/15] S3C64XX: add pwm for s3c64xx support
Zhong Hongbo
bocui107 at gmail.com
Sat Jul 28 11:35:37 CEST 2012
From: Zhong Hongbo <bocui107 at gmail.com>
Signed-off-by: Zhong Hongbo <bocui107 at gmail.com>
---
Change for V3:
- None.
Change for V2:
- Change the type of the return value from unsinged int
to unsinged long for s3c64xx_get_base_nand function.
---
arch/arm/cpu/arm1176/s3c64xx/Makefile | 1 +
arch/arm/cpu/arm1176/s3c64xx/pwm.c | 189 +++++++++++++++++++++++++++
arch/arm/include/asm/arch-s3c64xx/pwm.h | 70 ++++++++++
arch/arm/include/asm/arch-s3c64xx/s3c6400.h | 56 ++-------
arch/arm/include/asm/arch-s3c64xx/s3c64x0.h | 59 ---------
include/configs/smdk6400.h | 3 +
6 files changed, 272 insertions(+), 106 deletions(-)
create mode 100644 arch/arm/cpu/arm1176/s3c64xx/pwm.c
create mode 100644 arch/arm/include/asm/arch-s3c64xx/pwm.h
delete mode 100644 arch/arm/include/asm/arch-s3c64xx/s3c64x0.h
diff --git a/arch/arm/cpu/arm1176/s3c64xx/Makefile b/arch/arm/cpu/arm1176/s3c64xx/Makefile
index 0785b19..966663f 100644
--- a/arch/arm/cpu/arm1176/s3c64xx/Makefile
+++ b/arch/arm/cpu/arm1176/s3c64xx/Makefile
@@ -32,6 +32,7 @@ SOBJS = reset.o
COBJS-$(CONFIG_S3C6400) += cpu_init.o speed.o
COBJS-y += timer.o
+COBJS-$(CONFIG_PWM) += pwm.o
OBJS := $(addprefix $(obj),$(SOBJS) $(COBJS-y))
diff --git a/arch/arm/cpu/arm1176/s3c64xx/pwm.c b/arch/arm/cpu/arm1176/s3c64xx/pwm.c
new file mode 100644
index 0000000..d46470a
--- /dev/null
+++ b/arch/arm/cpu/arm1176/s3c64xx/pwm.c
@@ -0,0 +1,189 @@
+/*
+ * Copyright (C) 2012
+ *
+ * Zhong Hongbo <bocui107 at gmail.com>
+ *
+ * based on arch/arm/cpu/armv7/s5p-common/sromc.c
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <pwm.h>
+#include <asm/io.h>
+#include <asm/arch/s3c6400.h>
+#include <asm/arch/pwm.h>
+
+int pwm_enable(int pwm_id)
+{
+ const struct s3c_timer *pwm =
+ (struct s3c_timer *)s3c64xx_get_base_timer();
+ unsigned long tcon;
+
+ tcon = readl(&pwm->tcon);
+ tcon |= TCON_START(pwm_id);
+
+ writel(tcon, &pwm->tcon);
+
+ return 0;
+}
+
+void pwm_disable(int pwm_id)
+{
+ const struct s3c_timer *pwm =
+ (struct s3c_timer *)s3c64xx_get_base_timer();
+ unsigned long tcon;
+
+ tcon = readl(&pwm->tcon);
+ tcon &= ~TCON_START(pwm_id);
+
+ writel(tcon, &pwm->tcon);
+}
+
+static unsigned long pwm_calc_tin(int pwm_id, unsigned long freq)
+{
+ unsigned long tin_parent_rate;
+ unsigned int div;
+
+ tin_parent_rate = get_PCLK();
+
+ for (div = 2; div <= 16; div *= 2) {
+ if ((tin_parent_rate / (div << 16)) < freq)
+ return tin_parent_rate / div;
+ }
+
+ return tin_parent_rate / 16;
+}
+
+#define NS_IN_HZ (1000000000UL)
+
+int pwm_config(int pwm_id, int duty_ns, int period_ns)
+{
+ const struct s3c_timer *pwm =
+ (struct s3c_timer *)s3c64xx_get_base_timer();
+ unsigned int offset;
+ unsigned long tin_rate;
+ unsigned long tin_ns;
+ unsigned long period;
+ unsigned long tcon;
+ unsigned long tcnt;
+ unsigned long tcmp;
+
+ /*
+ * We currently avoid using 64bit arithmetic by using the
+ * fact that anything faster than 1GHz is easily representable
+ * by 32bits.
+ */
+ if (period_ns > NS_IN_HZ || duty_ns > NS_IN_HZ)
+ return -ERANGE;
+
+ if (duty_ns > period_ns)
+ return -EINVAL;
+
+ period = NS_IN_HZ / period_ns;
+
+ /* Check to see if we are changing the clock rate of the PWM */
+ tin_rate = pwm_calc_tin(pwm_id, period);
+
+ tin_ns = NS_IN_HZ / tin_rate;
+ tcnt = period_ns / tin_ns;
+
+ /* Note, counters count down */
+ tcmp = duty_ns / tin_ns;
+ tcmp = tcnt - tcmp;
+
+ /*
+ * the pwm hw only checks the compare register after a decrement,
+ * so the pin never toggles if tcmp = tcnt
+ */
+ if (tcmp == tcnt)
+ tcmp--;
+
+ if (tcmp < 0)
+ tcmp = 0;
+
+ /* Update the PWM register block. */
+ offset = pwm_id * 3;
+ if (pwm_id < 4) {
+ writel(tcnt, &pwm->tcntb0 + offset);
+ writel(tcmp, &pwm->tcmpb0 + offset);
+ }
+
+ tcon = readl(&pwm->tcon);
+ tcon |= TCON_UPDATE(pwm_id);
+ if (pwm_id < 4)
+ tcon |= TCON_AUTO_RELOAD(pwm_id);
+ else
+ tcon |= TCON4_AUTO_RELOAD;
+ writel(tcon, &pwm->tcon);
+
+ tcon &= ~TCON_UPDATE(pwm_id);
+ writel(tcon, &pwm->tcon);
+
+ return 0;
+}
+
+int pwm_init(int pwm_id, int div, int invert)
+{
+ u32 val;
+ const struct s3c_timer *pwm =
+ (struct s3c_timer *)s3c64xx_get_base_timer();
+ unsigned long timer_rate_hz;
+ unsigned int offset, prescaler;
+
+ /*
+ * Timer Freq(HZ) =
+ * PWM_CLK / { (prescaler_value + 1) * (divider_value) }
+ */
+
+ val = readl(&pwm->tcfg0);
+ if (pwm_id < 2) {
+ prescaler = PRESCALER_0;
+ val &= ~0xff;
+ val |= (prescaler & 0xff);
+ } else {
+ prescaler = PRESCALER_1;
+ val &= ~(0xff << 8);
+ val |= (prescaler & 0xff) << 8;
+ }
+ writel(val, &pwm->tcfg0);
+ val = readl(&pwm->tcfg1);
+ val &= ~(0xf << MUX_DIV_SHIFT(pwm_id));
+ val |= (div & 0xf) << MUX_DIV_SHIFT(pwm_id);
+ writel(val, &pwm->tcfg1);
+
+ timer_rate_hz = get_PCLK() / ((prescaler + 1) *
+ (div + 1));
+
+ timer_rate_hz = timer_rate_hz / CONFIG_SYS_HZ;
+
+ /* set count value */
+ offset = pwm_id * 3;
+ writel(timer_rate_hz, &pwm->tcntb0 + offset);
+
+ val = readl(&pwm->tcon) & ~(0xf << TCON_OFFSET(pwm_id));
+ if (invert && (pwm_id < 4))
+ val |= TCON_INVERTER(pwm_id);
+ writel(val, &pwm->tcon);
+
+ pwm_enable(pwm_id);
+
+ return 0;
+}
diff --git a/arch/arm/include/asm/arch-s3c64xx/pwm.h b/arch/arm/include/asm/arch-s3c64xx/pwm.h
new file mode 100644
index 0000000..1e18f8c
--- /dev/null
+++ b/arch/arm/include/asm/arch-s3c64xx/pwm.h
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2012
+ * Zhong Hongbo <bocui107 at gmail.com>
+ *
+ * based on arch/arm/include/asm/arch-s5pc1xx/pwm.h
+ *
+ * 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; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef __ASM_ARM_ARCH_PWM_H_
+#define __ASM_ARM_ARCH_PWM_H_
+
+#define PRESCALER_0 (8 - 1) /* prescaler of timer 0, 1 */
+#define PRESCALER_1 (16 - 1) /* prescaler of timer 2, 3, 4 */
+
+/* Divider MUX */
+#define MUX_DIV_1 0 /* 1/1 period */
+#define MUX_DIV_2 1 /* 1/2 period */
+#define MUX_DIV_4 2 /* 1/4 period */
+#define MUX_DIV_8 3 /* 1/8 period */
+#define MUX_DIV_16 4 /* 1/16 period */
+
+#define MUX_DIV_SHIFT(x) (x * 4)
+
+#define TCON_OFFSET(x) ((x + 1) * (!!x) << 2)
+
+#define TCON_START(x) (1 << TCON_OFFSET(x))
+#define TCON_UPDATE(x) (1 << (TCON_OFFSET(x) + 1))
+#define TCON_INVERTER(x) (1 << (TCON_OFFSET(x) + 2))
+#define TCON_AUTO_RELOAD(x) (1 << (TCON_OFFSET(x) + 3))
+#define TCON4_AUTO_RELOAD (1 << 22)
+
+#define TCFG1_DMA(x) (x << 20)
+
+#ifndef __ASSEMBLY__
+struct s3c_timer {
+ unsigned int tcfg0;
+ unsigned int tcfg1;
+ unsigned int tcon;
+ unsigned int tcntb0;
+ unsigned int tcmpb0;
+ unsigned int tcnto0;
+ unsigned int tcntb1;
+ unsigned int tcmpb1;
+ unsigned int tcnto1;
+ unsigned int tcntb2;
+ unsigned int res1;
+ unsigned int tcnto2;
+ unsigned int tcntb3;
+ unsigned int res2;
+ unsigned int tcnto3;
+ unsigned int tcntb4;
+ unsigned int tcnto4;
+ unsigned int tint_cstat;
+};
+#endif
+#endif
diff --git a/arch/arm/include/asm/arch-s3c64xx/s3c6400.h b/arch/arm/include/asm/arch-s3c64xx/s3c6400.h
index 77b9509..b884763 100644
--- a/arch/arm/include/asm/arch-s3c64xx/s3c6400.h
+++ b/arch/arm/include/asm/arch-s3c64xx/s3c6400.h
@@ -31,6 +31,10 @@
#ifndef __S3C6400_H__
#define __S3C6400_H__
+#if defined(CONFIG_SYNC_MODE) && defined(CONFIG_S3C6400)
+#error CONFIG_SYNC_MODE unavailable on S3C6400, please, fix your configuration!
+#endif
+
#define S3C64XX_UART_CHANNELS 3
#define S3C64XX_SPI_CHANNELS 2
@@ -587,51 +591,6 @@
*/
#define ELFIN_TIMER_BASE 0x7F006000
-#define TCFG0_REG __REG(0x7F006000)
-#define TCFG1_REG __REG(0x7F006004)
-#define TCON_REG __REG(0x7F006008)
-#define TCNTB0_REG __REG(0x7F00600c)
-#define TCMPB0_REG __REG(0x7F006010)
-#define TCNTO0_REG __REG(0x7F006014)
-#define TCNTB1_REG __REG(0x7F006018)
-#define TCMPB1_REG __REG(0x7F00601c)
-#define TCNTO1_REG __REG(0x7F006020)
-#define TCNTB2_REG __REG(0x7F006024)
-#define TCMPB2_REG __REG(0x7F006028)
-#define TCNTO2_REG __REG(0x7F00602c)
-#define TCNTB3_REG __REG(0x7F006030)
-#define TCMPB3_REG __REG(0x7F006034)
-#define TCNTO3_REG __REG(0x7F006038)
-#define TCNTB4_REG __REG(0x7F00603c)
-#define TCNTO4_REG __REG(0x7F006040)
-
-/* Fields */
-#define fTCFG0_DZONE Fld(8, 16) /* the dead zone length (=timer 0) */
-#define fTCFG0_PRE1 Fld(8, 8) /* prescaler value for time 2,3,4 */
-#define fTCFG0_PRE0 Fld(8, 0) /* prescaler value for time 0,1 */
-#define fTCFG1_MUX4 Fld(4, 16)
-/* bits */
-#define TCFG0_DZONE(x) FInsrt((x), fTCFG0_DZONE)
-#define TCFG0_PRE1(x) FInsrt((x), fTCFG0_PRE1)
-#define TCFG0_PRE0(x) FInsrt((x), fTCFG0_PRE0)
-#define TCON_4_AUTO (1 << 22) /* auto reload on/off for Timer 4 */
-#define TCON_4_UPDATE (1 << 21) /* manual Update TCNTB4 */
-#define TCON_4_ONOFF (1 << 20) /* 0: Stop, 1: start Timer 4 */
-#define COUNT_4_ON (TCON_4_ONOFF * 1)
-#define COUNT_4_OFF (TCON_4_ONOFF * 0)
-#define TCON_3_AUTO (1 << 19) /* auto reload on/off for Timer 3 */
-#define TIMER3_ATLOAD_ON (TCON_3_AUTO * 1)
-#define TIMER3_ATLAOD_OFF FClrBit(TCON, TCON_3_AUTO)
-#define TCON_3_INVERT (1 << 18) /* 1: Inverter on for TOUT3 */
-#define TIMER3_IVT_ON (TCON_3_INVERT * 1)
-#define TIMER3_IVT_OFF (FClrBit(TCON, TCON_3_INVERT))
-#define TCON_3_MAN (1 << 17) /* manual Update TCNTB3,TCMPB3 */
-#define TIMER3_MANUP (TCON_3_MAN*1)
-#define TIMER3_NOP (FClrBit(TCON, TCON_3_MAN))
-#define TCON_3_ONOFF (1 << 16) /* 0: Stop, 1: start Timer 3 */
-#define TIMER3_ON (TCON_3_ONOFF * 1)
-#define TIMER3_OFF (FClrBit(TCON, TCON_3_ONOFF))
-
#if defined(CONFIG_CLK_400_100_50)
#define STARTUP_AMDIV 400
#define STARTUP_MDIV 400
@@ -749,8 +708,6 @@
#ifndef __ASSEMBLY__
-#include "s3c64x0.h"
-
static inline unsigned long s3c64xx_get_base_uart(void)
{
return ELFIN_UART_BASE;
@@ -760,6 +717,11 @@ static inline unsigned long s3c64xx_get_base_nand(void)
{
return ELFIN_NAND_BASE;
}
+
+static inline unsigned long s3c64xx_get_base_timer(void)
+{
+ return ELFIN_TIMER_BASE;
+}
#endif
#endif /*__S3C6400_H__*/
diff --git a/arch/arm/include/asm/arch-s3c64xx/s3c64x0.h b/arch/arm/include/asm/arch-s3c64xx/s3c64x0.h
deleted file mode 100644
index 7add68c..0000000
--- a/arch/arm/include/asm/arch-s3c64xx/s3c64x0.h
+++ /dev/null
@@ -1,59 +0,0 @@
-/*
- * (C) Copyright 2003
- * David MÃŒller ELSOFT AG Switzerland. d.mueller at elsoft.ch
- *
- * (C) Copyright 2008
- * Guennadi Liakhovetki, DENX Software Engineering, <lg at denx.de>
- *
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * 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; either version 2 of
- * the License, or (at your option) any later version.
- *
- * 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.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
- */
-
-/************************************************
- * NAME : S3C64XX.h
- * Version : 31.3.2003
- *
- * common stuff for SAMSUNG S3C64XX SoC
- ************************************************/
-
-#ifndef __S3C64XX_H__
-#define __S3C64XX_H__
-
-#if defined(CONFIG_SYNC_MODE) && defined(CONFIG_S3C6400)
-#error CONFIG_SYNC_MODE unavailable on S3C6400, please, fix your configuration!
-#endif
-
-#include <asm/types.h>
-
-/* PWM TIMER (see manual chapter 10) */
-typedef struct {
- volatile u32 TCNTB;
- volatile u32 TCMPB;
- volatile u32 TCNTO;
-} s3c64xx_timer;
-
-typedef struct {
- volatile u32 TCFG0;
- volatile u32 TCFG1;
- volatile u32 TCON;
- s3c64xx_timer ch[4];
- volatile u32 TCNTB4;
- volatile u32 TCNTO4;
-} s3c64xx_timers;
-
-#endif /*__S3C64XX_H__*/
diff --git a/include/configs/smdk6400.h b/include/configs/smdk6400.h
index 47326d6..3642a5c 100644
--- a/include/configs/smdk6400.h
+++ b/include/configs/smdk6400.h
@@ -141,6 +141,9 @@
#define CONFIG_SYS_HZ 1000
+/* PWM */
+#define CONFIG_PWM 1
+
/*-----------------------------------------------------------------------
* Stack sizes
*
--
1.7.5.4
More information about the U-Boot
mailing list