[PATCH] sh: SH-3 On-Chip ADC support

From: Paul Mundt <lethal@Linux-SH.ORG>

This adds support for the SH-3's on-chip ADC (which is needed by things like
the touchscreen, etc.).
Signed-off-by: Andriy Skulysh <askulysh@image.kiev.ua>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/sh/kernel/cpu/Makefile

@@ -10,6 +10,7 @@ obj-$(CONFIG_CPU_SH4)		+= sh4/
 
 obj-$(CONFIG_SH_RTC)            += rtc.o
 obj-$(CONFIG_UBC_WAKEUP)	+= ubc.o
+obj-$(CONFIG_SH_ADC)            += adc.o
 
 USE_STANDARD_AS_RULE := true
 

arch/sh/kernel/cpu/adc.c

+/*
+ * linux/arch/sh/kernel/adc.c -- SH3 on-chip ADC support
+ *
+ *  Copyright (C) 2004  Andriy Skulysh <askulysh@image.kiev.ua>
+ */
+
+#include <linux/module.h>
+#include <asm/adc.h>
+#include <asm/io.h>
+
+
+int adc_single(unsigned int channel)
+{
+	int off;
+	unsigned char csr;
+
+	if (channel >= 8) return -1;
+
+	off = (channel & 0x03) << 2;
+
+	csr = ctrl_inb(ADCSR);
+	csr = channel | ADCSR_ADST | ADCSR_CKS;
+	ctrl_outb(csr, ADCSR);
+
+	do {
+		csr = ctrl_inb(ADCSR);
+	} while ((csr & ADCSR_ADF) == 0);
+
+	csr &= ~(ADCSR_ADF | ADCSR_ADST);
+	ctrl_outb(csr, ADCSR);
+
+	return (((ctrl_inb(ADDRAH + off) << 8) |
+		ctrl_inb(ADDRAL + off)) >> 6);
+}
+
+EXPORT_SYMBOL(adc_single);

include/asm-sh/adc.h

+#ifndef __ASM_ADC_H
+#define __ASM_ADC_H
+
+/*
+ * Copyright (C) 2004  Andriy Skulysh
+ */
+
+#include <asm/cpu/adc.h>
+
+int adc_single(unsigned int channel);
+
+#endif /* __ASM_ADC_H */

include/asm-sh/cpu-sh3/adc.h

+#ifndef __ASM_CPU_SH3_ADC_H
+#define __ASM_CPU_SH3_ADC_H
+
+/*
+ * Copyright (C) 2004  Andriy Skulysh
+ */
+
+
+#define ADDRAH	0xa4000080
+#define ADDRAL	0xa4000082
+#define ADDRBH	0xa4000084
+#define ADDRBL	0xa4000086
+#define ADDRCH	0xa4000088
+#define ADDRCL	0xa400008a
+#define ADDRDH	0xa400008c
+#define ADDRDL	0xa400008e
+#define ADCSR	0xa4000090
+
+#define ADCSR_ADF	0x80
+#define ADCSR_ADIE	0x40
+#define ADCSR_ADST	0x20
+#define ADCSR_MULTI	0x10
+#define ADCSR_CKS	0x08
+#define ADCSR_CH_MASK	0x07
+
+#define ADCR	0xa4000092
+
+#endif /* __ASM_CPU_SH3_ADC_H */

include/asm-sh/hp6xx/hp6xx.h

@@ -5,9 +5,22 @@
  * Copyright (C) 2003  Andriy Skulysh
  */
 
+#define HP680_TS_IRQ IRQ3_IRQ
 
-#define DAC_LCD_BRIGHTNESS		0
-#define DAC_SPEAKER_VOLUME		1
+#define DAC_LCD_BRIGHTNESS	0
+#define DAC_SPEAKER_VOLUME	1
+
+#define PHDR_TS_PEN_DOWN	0x08
+
+#define SCPDR_TS_SCAN_ENABLE	0x20
+#define SCPDR_TS_SCAN_Y		0x02
+#define SCPDR_TS_SCAN_X		0x01
+
+#define SCPCR_TS_ENABLE		0x405
+#define SCPCR_TS_MASK		0xc0f
+
+#define ADC_CHANNEL_TS_Y	1
+#define ADC_CHANNEL_TS_X	2
 
 #define HD64461_GPADR_SPEAKER	0x01
 #define HD64461_GPADR_PCMCIA0	(0x02|0x08)
@@ -16,4 +29,3 @@
 
 
 #endif /* __ASM_SH_HP6XX_H */
-