init commit via android 4.4 uboot

1 files changed, 362 insertions, 0 deletions

diff --git a/board/trab/tsc2000.c b/board/trab/tsc2000.c
new file mode 100755
index 0000000..ca68682
--- /dev/null
+++ b/board/trab/tsc2000.c
@@ -0,0 +1,362 @@
+/*
+ * Functions to access the TSC2000 controller on TRAB board (used for scanning
+ * thermo sensors)
+ *
+ * Copyright (C) 2003 Martin Krause, TQ-Systems GmbH, martin.krause@tqs.de
+ *
+ * Copyright (C) 2002 DENX Software Engineering, Wolfgang Denk, wd@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
+ */
+
+#include <common.h>
+#include <s3c2400.h>
+#include "tsc2000.h"
+
+#include "Pt1000_temp_data.h"
+
+/* helper function */
+#define abs(value) (((value) < 0) ? ((value)*-1) : (value))
+
+/*
+ * Maximal allowed deviation between two immediate meassurments of an analog
+ * thermo channel. 1 DIGIT = 0.0276 °C. This is used to filter sporadic
+ * "jumps" in measurment.
+ */
+#define MAX_DEVIATION	18	/* unit: DIGITs of adc; 18 DIGIT = 0.5 °C */
+
+void spi_init(void)
+{
+	S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();
+	S3C24X0_SPI * const spi = S3C24X0_GetBase_SPI();
+	int i;
+
+	/* Configure I/O ports. */
+	gpio->PDCON = (gpio->PDCON & 0xF3FFFF) | 0x040000;
+	gpio->PGCON = (gpio->PGCON & 0x0F3FFF) | 0x008000;
+	gpio->PGCON = (gpio->PGCON & 0x0CFFFF) | 0x020000;
+	gpio->PGCON = (gpio->PGCON & 0x03FFFF) | 0x080000;
+
+	CLR_CS_TOUCH();
+
+	spi->ch[0].SPPRE = 0x1F; /* Baud-rate ca. 514kHz */
+	spi->ch[0].SPPIN = 0x01; /* SPI-MOSI holds Level after last bit */
+	spi->ch[0].SPCON = 0x1A; /* Polling, Prescaler, Master, CPOL=0,
+				    CPHA=1 */
+
+	/* Dummy byte ensures clock to be low. */
+	for (i = 0; i < 10; i++) {
+		spi->ch[0].SPTDAT = 0xFF;
+	}
+	spi_wait_transmit_done();
+}
+
+
+void spi_wait_transmit_done(void)
+{
+	S3C24X0_SPI * const spi = S3C24X0_GetBase_SPI();
+
+	while (!(spi->ch[0].SPSTA & 0x01)); /* wait until transfer is done */
+}
+
+
+void tsc2000_write(unsigned short reg, unsigned short data)
+{
+	S3C24X0_SPI * const spi = S3C24X0_GetBase_SPI();
+	unsigned int command;
+
+	SET_CS_TOUCH();
+	command = reg;
+	spi->ch[0].SPTDAT = (command & 0xFF00) >> 8;
+	spi_wait_transmit_done();
+	spi->ch[0].SPTDAT = (command & 0x00FF);
+	spi_wait_transmit_done();
+	spi->ch[0].SPTDAT = (data & 0xFF00) >> 8;
+	spi_wait_transmit_done();
+	spi->ch[0].SPTDAT = (data & 0x00FF);
+	spi_wait_transmit_done();
+
+	CLR_CS_TOUCH();
+}
+
+
+unsigned short tsc2000_read (unsigned short reg)
+{
+	unsigned short command, data;
+	S3C24X0_SPI * const spi = S3C24X0_GetBase_SPI();
+
+	SET_CS_TOUCH();
+	command = 0x8000 | reg;
+
+	spi->ch[0].SPTDAT = (command & 0xFF00) >> 8;
+	spi_wait_transmit_done();
+	spi->ch[0].SPTDAT = (command & 0x00FF);
+	spi_wait_transmit_done();
+
+	spi->ch[0].SPTDAT = 0xFF;
+	spi_wait_transmit_done();
+	data = spi->ch[0].SPRDAT;
+	spi->ch[0].SPTDAT = 0xFF;
+	spi_wait_transmit_done();
+
+	CLR_CS_TOUCH();
+	return (spi->ch[0].SPRDAT & 0x0FF) | (data << 8);
+}
+
+
+void tsc2000_set_mux (unsigned int channel)
+{
+	S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();
+
+	CLR_MUX1_ENABLE; CLR_MUX2_ENABLE;
+	CLR_MUX3_ENABLE; CLR_MUX4_ENABLE;
+	switch (channel) {
+	case 0:
+		CLR_MUX0; CLR_MUX1;
+		SET_MUX1_ENABLE;
+		break;
+	case 1:
+		SET_MUX0; CLR_MUX1;
+		SET_MUX1_ENABLE;
+		break;
+	case 2:
+		CLR_MUX0; SET_MUX1;
+		SET_MUX1_ENABLE;
+		break;
+	case 3:
+		SET_MUX0; SET_MUX1;
+		SET_MUX1_ENABLE;
+		break;
+	case 4:
+		CLR_MUX0; CLR_MUX1;
+		SET_MUX2_ENABLE;
+		break;
+	case 5:
+		SET_MUX0; CLR_MUX1;
+		SET_MUX2_ENABLE;
+		break;
+	case 6:
+		CLR_MUX0; SET_MUX1;
+		SET_MUX2_ENABLE;
+		break;
+	case 7:
+		SET_MUX0; SET_MUX1;
+		SET_MUX2_ENABLE;
+		break;
+	case 8:
+		CLR_MUX0; CLR_MUX1;
+		SET_MUX3_ENABLE;
+		break;
+	case 9:
+		SET_MUX0; CLR_MUX1;
+		SET_MUX3_ENABLE;
+		break;
+	case 10:
+		CLR_MUX0; SET_MUX1;
+		SET_MUX3_ENABLE;
+		break;
+	case 11:
+		SET_MUX0; SET_MUX1;
+		SET_MUX3_ENABLE;
+		break;
+	case 12:
+		CLR_MUX0; CLR_MUX1;
+		SET_MUX4_ENABLE;
+		break;
+	case 13:
+		SET_MUX0; CLR_MUX1;
+		SET_MUX4_ENABLE;
+		break;
+	case 14:
+		CLR_MUX0; SET_MUX1;
+		SET_MUX4_ENABLE;
+		break;
+	case 15:
+		SET_MUX0; SET_MUX1;
+		SET_MUX4_ENABLE;
+		break;
+	default:
+		CLR_MUX0; CLR_MUX1;
+	}
+}
+
+
+void tsc2000_set_range (unsigned int range)
+{
+	S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();
+
+	switch (range) {
+	case 1:
+		CLR_SEL_TEMP_V_0; SET_SEL_TEMP_V_1;
+		CLR_SEL_TEMP_V_2; CLR_SEL_TEMP_V_3;
+		break;
+	case 2:
+		CLR_SEL_TEMP_V_0; CLR_SEL_TEMP_V_1;
+		CLR_SEL_TEMP_V_2; SET_SEL_TEMP_V_3;
+		break;
+	case 3:
+		SET_SEL_TEMP_V_0; CLR_SEL_TEMP_V_1;
+		SET_SEL_TEMP_V_2; CLR_SEL_TEMP_V_3;
+		break;
+	}
+}
+
+
+u16 tsc2000_read_channel (unsigned int channel)
+{
+	u16 res;
+
+	tsc2000_set_mux(channel);
+	udelay(3 * TSC2000_DELAY_BASE);
+
+	tsc2000_write(TSC2000_REG_ADC, 0x2036);
+	adc_wait_conversion_done ();
+	res = tsc2000_read(TSC2000_REG_AUX1);
+	return res;
+}
+
+
+s32 tsc2000_contact_temp (void)
+{
+	long adc_pt1000, offset;
+	long u_pt1000;
+	long contact_temp;
+	long temp1, temp2;
+
+	tsc2000_reg_init ();
+	tsc2000_set_range (3);
+
+	/*
+	 * Because of sporadic "jumps" in the measured adc values every
+	 * channel is read two times. If there is a significant difference
+	 * between the two measurements, then print an error and do a third
+	 * measurement, because it is very unlikely that a successive third
+	 * measurement goes also wrong.
+	 */
+	temp1 = tsc2000_read_channel (14);
+	temp2 = tsc2000_read_channel (14);
+	if (abs(temp2 - temp1) < MAX_DEVIATION)
+		adc_pt1000 = temp2;
+	else {
+		printf ("%s: read adc value (channel 14) exceeded max allowed "
+			"deviation: %d * 0.0276 °C\n",
+			__FUNCTION__, MAX_DEVIATION);
+		printf ("adc value 1: %ld DIGITs\nadc value 2: %ld DIGITs\n",
+			temp1, temp2);
+		adc_pt1000 = tsc2000_read_channel (14);
+		printf ("use (third read) adc value: adc_pt1000 = "
+			"%ld DIGITs\n",	adc_pt1000);
+	}
+	debug ("read channel 14 (pt1000 adc value): %ld\n", adc_pt1000);
+
+	temp1 = tsc2000_read_channel (15);
+	temp2 = tsc2000_read_channel (15);
+	if (abs(temp2 - temp1) < MAX_DEVIATION)
+		offset = temp2;
+	else {
+		printf ("%s: read adc value (channel 15) exceeded max allowed "
+			"deviation: %d * 0.0276 °C\n",
+			__FUNCTION__, MAX_DEVIATION);
+		printf ("adc value 1: %ld DIGITs\nadc value 2: %ld DIGITs\n",
+			temp1, temp2);
+		offset = tsc2000_read_channel (15);
+		printf ("use (third read) adc value: offset = %ld DIGITs\n",
+			offset);
+	}
+	debug ("read channel 15 (offset): %ld\n", offset);
+
+	/*
+	 * Formula for calculating voltage drop on PT1000 resistor: u_pt1000 =
+	 * x_range3 * (adc_raw - offset) / 10. Formula to calculate x_range3:
+	 * x_range3 = (2500 * (1000000 + err_vref + err_amp3)) / (4095*6). The
+	 * error correction Values err_vref and err_amp3 are assumed as 0 in
+	 * u-boot, because this could cause only a very small error (< 1%).
+	 */
+	u_pt1000 = (101750 * (adc_pt1000 - offset)) / 10;
+	debug ("u_pt1000: %ld\n", u_pt1000);
+
+	if (tsc2000_interpolate(u_pt1000, Pt1000_temp_table,
+				&contact_temp) == -1) {
+		printf ("%s: error interpolating PT1000 vlaue\n",
+			 __FUNCTION__);
+		return (-1000);
+	}
+	debug ("contact_temp: %ld\n", contact_temp);
+
+	return contact_temp;
+}
+
+
+void tsc2000_reg_init (void)
+{
+	S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();
+
+	tsc2000_write(TSC2000_REG_ADC, 0x2036);
+	tsc2000_write(TSC2000_REG_REF, 0x0011);
+	tsc2000_write(TSC2000_REG_DACCTL, 0x0000);
+
+	CON_MUX0;
+	CON_MUX1;
+
+	CON_MUX1_ENABLE;
+	CON_MUX2_ENABLE;
+	CON_MUX3_ENABLE;
+	CON_MUX4_ENABLE;
+
+	CON_SEL_TEMP_V_0;
+	CON_SEL_TEMP_V_1;
+	CON_SEL_TEMP_V_2;
+	CON_SEL_TEMP_V_3;
+
+	tsc2000_set_mux(0);
+	tsc2000_set_range(0);
+}
+
+
+int tsc2000_interpolate(long value, long data[][2], long *result)
+{
+	int i;
+
+	/* the data is sorted and the first element is upper
+	 * limit so we can easily check for out-of-band values
+	 */
+	if (data[0][0] < value || data[1][0] > value)
+		return -1;
+
+	i = 1;
+	while (data[i][0] < value)
+		i++;
+
+	/* To prevent overflow we have to store the intermediate
+	   result in 'long long'.
+	*/
+
+	*result = data[i-1][1] +
+		((unsigned long long)(data[i][1] - data[i-1][1])
+		 * (unsigned long long)(value - data[i-1][0]))
+		/ (data[i][0] - data[i-1][0]);
+
+	return 0;
+}
+
+
+void adc_wait_conversion_done(void)
+{
+	while (!(tsc2000_read(TSC2000_REG_ADC) & (1 << 14)));
+}