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BeagleBone configuration from Cape EEPROM #2

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BeagleBone configuration from Cape EEPROM #2

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bf2dd84
Fixed compiletime warnings.
modmaker May 13, 2012
1d90f9c
Fixed size of pinmux data array in EEPROM data struct.
modmaker May 13, 2012
27fc03f
Fixed debugfs mux output (always reporting pins as output)
modmaker May 13, 2012
0633a3a
Implemented Bone Cape configuration from EEPROM. Only used for BEBOPR…
modmaker May 13, 2012
6c177da
Adding many of the missing signals to the mux table.
modmaker May 13, 2012
2ca7fff
Added missing termination record to bone_pin_mux data.
modmaker May 13, 2012
41cb169
Changed conditional code into runtime check to allow for multi-omap k…
modmaker May 14, 2012
a5ddb28
Replaced conditional debug code by pr_debug statements for cleaner code.
modmaker May 14, 2012
4fbb580
Workaround for boards with (mistaken) ASCII interpretation for the nu…
modmaker May 14, 2012
3701130
Use OMAP_ prefix instead of AM33XX_ for debugfs output to preserve co…
modmaker May 14, 2012
c49bbe8
Workaround for EEPROM contents blocking further I2C bus access.
modmaker May 14, 2012
8b461c5
Fixed reversed part of LCD bus. Added even more missing entries (TBC).
modmaker May 14, 2012
781d028
Added check on EEPROM revision to prevent interpreting unknown formats.
modmaker May 15, 2012
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311 changes: 308 additions & 3 deletions arch/arm/mach-omap2/board-am335xevm.c
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,7 @@
#include <linux/pwm/pwm.h>
#include <linux/w1-gpio.h>
#include <linux/can/platform/mcp251x.h>
#include <linux/input/ti_tscadc.h>

/* LCD controller is similar to DA850 */
#include <video/da8xx-fb.h>
Expand Down Expand Up @@ -298,7 +299,6 @@ struct da8xx_lcdc_platform_data dvi_pdata = {
};

/* TSc controller */
#include <linux/input/ti_tscadc.h>
#include <linux/lis3lv02d.h>

/* TSc controller */
Expand Down Expand Up @@ -481,7 +481,7 @@ struct beaglebone_cape_eeprom_config {
char partnumber[16];
u16 numpins;
char serial[12];
u8 muxdata[170];
u16 muxdata[74];
u16 current_3v3;
u16 current_vdd5v;
u16 current_sys5v;
Expand Down Expand Up @@ -1428,6 +1428,7 @@ static struct pinmux_config bone_pin_mux[] = {
{"gpmc_a8.rgmii2_rd3", OMAP_MUX_MODE7 | AM33XX_PIN_OUTPUT},
/* Grounding gpio1_6 (pin 3 Conn A) signals bone tester to start diag tests */
{"gpmc_ad6.gpio1_6", OMAP_MUX_MODE7 | AM33XX_PIN_INPUT_PULLUP},
{NULL, 0},
};

/* Module pin mux for eCAP0 */
Expand Down Expand Up @@ -2180,15 +2181,313 @@ static void tt3201_init(int evm_id, int profile)

am33xx_d_can_init(1);
}

static const char* cape_pins[] = {
/*
From SRM RevA5.0.1:
*/
/* offset 88 - P9-22 */ "uart2_rxd",
/* offset 90 - P9-21 */ "uart2_txd",
/* offset 92 - P9-18 */ "spi0_d1",
/* offset 94 - P9-17 */ "spi0_cs0",
/* offset 96 - P9-42 */ "ecap0_in_pwm0_out",
/* offset 98 - P8-35 */ "lcd_data12",
/* offset 100 - P8-33 */ "lcd_data13",
/* offset 102 - P8-31 */ "lcd_data14",
/* offset 104 - P8-32 */ "lcd_data15",
/* offset 106 - P9-19 */ "uart1_rtsn",
/* offset 108 - P9-20 */ "uart1_ctsn",
/* offset 110 - P9-26 */ "uart1_rxd",
/* offset 112 - P9-24 */ "uart1_txd",
/* offset 114 - P9-41 */ "xdma_event_intr1",
/* offset 116 - P8-19 */ "gpmc_ad8",
/* offset 118 - P8-13 */ "gpmc_ad9",
/* offset 120 - P8-14 */ "gpmc_ad10",
/* offset 122 - P8-17 */ "gpmc_ad12",
/* offset 124 - P9-11 */ "gpmc_wait0",
/* offset 126 - P9-13 */ "gpmc_wpn",
/* offset 128 - P8-25 */ "gpmc_ad0",
/* offset 130 - P8-24 */ "gpmc_ad1",
/* offset 132 - P8- 5 */ "gpmc_ad2",
/* offset 134 - P8- 6 */ "gpmc_ad3",
/* offset 136 - P8-23 */ "gpmc_ad4",
/* offset 138 - P8-22 */ "gpmc_ad5",
/* offset 140 - P8- 3 */ "gpmc_ad6",
/* offset 142 - P8- 4 */ "gpmc_ad7",
/* offset 144 - P8-12 */ "gpmc_ad12",
/* offset 146 - P8-11 */ "gpmc_ad13",
/* offset 148 - P8-16 */ "gpmc_ad14",
/* offset 150 - P8-15 */ "gpmc_ad15",
/* offset 152 - P9-15 */ "gpmc_a0",
/* offset 154 - P9-23 */ "gpmc_a1",
/* offset 156 - P9-14 */ "gpmc_a2",
/* offset 158 - P9-16 */ "gpmc_a3",
/* offset 160 - P9-12 */ "gpmc_be1n",
/* offset 162 - P8-26 */ "gpmc_csn0",
/* offset 164 - P8-21 */ "gpmc_csn1",
/* offset 166 - P8-20 */ "gpmc_csn2",
/* offset 168 - P8-18 */ "gpmc_clk",
/* offset 170 - P8-7 */ "gpmc_advn_ale",
/* offset 172 - P8-9 */ "gpmc_ben0_cle",
/* offset 174 - P8-10 */ "gpmc_wen",
/* offset 176 - P8-8 */ "gpmc_csn3",
/* offset 178 - P8-45 */ "lcd_data0",
/* offset 180 - P8-46 */ "lcd_data1",
/* offset 182 - P8-43 */ "lcd_data2",
/* offset 184 - P8-44 */ "lcd_data3",
/* offset 186 - P8-41 */ "lcd_data4",
/* offset 188 - P8-42 */ "lcd_data5",
/* offset 190 - P8-39 */ "lcd_data6",
/* offset 192 - P8-40 */ "lcd_data7",
/* offset 194 - P8-37 */ "lcd_data8",
/* offset 196 - P8-38 */ "lcd_data9",
/* offset 198 - P8-36 */ "lcd_data10",
/* offset 200 - P8-34 */ "lcd_data11",
/* offset 202 - P8-27 */ "lcd_vsync",
/* offset 204 - P8-29 */ "lcd_hsync",
/* offset 206 - P8-28 */ "lcd_pclk",
/* offset 208 - P8-30 */ "lcd_ac_bias_en",
/* offset 210 - P9-29 */ "mcasp0_fsx",
/* offset 212 - P9-30 */ "mcasp0_axr0",
/* offset 214 - P9-28 */ "mcasp0_ahclkr",
/* offset 216 - P9-27 */ "mcasp0_fsr",
/* offset 218 - P9-31 */ "mcasp0_aclkx",
/* offset 220 - P9-25 */ "mcasp0_ahclkx",
/* offset 222 - P9-39 */ "ain0",
/* offset 224 - P9-40 */ "ain1",
/* offset 226 - P9-37 */ "ain2",
/* offset 228 - P9-38 */ "ain3",
/* offset 230 - P9-33 */ "ain4",
/* offset 232 - P9-36 */ "ain5",
/* offset 234 - P9-35 */ "ain6",
};

#define BIG_ENDIAN_16( i) ( ((i & 255) << 8) | ((i >> 8) & 255) )
#define NR_ITEMS( x) (sizeof( (x)) / sizeof( *(x)))

extern int am33xx_mux_get_entry( int index, struct omap_mux** mux);

typedef union {
/*
From SRM RevA5.0.1:
Bit 15 Pin is used or not: 0=Unused by Cape 1=Used by Cape
Bit 14-13 Pin Direction: 10=Output 01=Input 11=BDIR
Bit 12-7 Reserved
Bit 6 Slew Rate: 0=Fast 1=Slow
Bit 5 Rx Enable: 0=Disabled 1=Enabled
Bit 4 Pull Up/Dn Select: 0=Pulldown 1=PullUp
Bit 3 Pull Up/DN enabled: 0=Enabled 1=Disabled
Bit 2-0 Mux Mode Selection: Mode 0-7
*/
struct {
uint16_t mux : 3;
uint16_t pull_enable : 1;
uint16_t pull_up : 1;
uint16_t rx_enable : 1;
uint16_t slew_rate : 1;
uint16_t reserved : 6;
uint16_t direction : 2;
uint16_t used : 1;
};
uint16_t value;
} pin_def;

#define DEBUG_EEPROM_CONFIG 0

static int bone_io_get_mux_setting( pin_def setting)
{
int pin_setting;

switch (setting.direction) {
case 1:
/* input */
if (setting.pull_enable) {
if (setting.pull_up) {
pin_setting = AM33XX_PIN_INPUT_PULLUP;
} else {
pin_setting = AM33XX_PIN_INPUT_PULLDOWN;
}
} else {
pin_setting = AM33XX_PIN_INPUT;
}
if (!setting.rx_enable) {
pr_debug( " pin is set as input but the receiver is not enabled!\n");
}
break;
case 2:
/* output */
pin_setting = AM33XX_PIN_OUTPUT;
break;
case 3:
/* bi-dir */
default:
/* reserved */
pr_debug( " pin ignored because it uses an unsupported mode: 0x%04x\n",
setting.direction);
return -1;
}
pr_debug(" pin is configured as %s\n",
(pin_setting & AM33XX_PIN_INPUT) ? "input" : "output");
switch (setting.mux) {
case 0: pin_setting |= OMAP_MUX_MODE0; break;
case 1: pin_setting |= OMAP_MUX_MODE1; break;
case 2: pin_setting |= OMAP_MUX_MODE2; break;
case 3: pin_setting |= OMAP_MUX_MODE3; break;
case 4: pin_setting |= OMAP_MUX_MODE4; break;
case 5: pin_setting |= OMAP_MUX_MODE5; break;
case 6: pin_setting |= OMAP_MUX_MODE6; break;
case 7: pin_setting |= OMAP_MUX_MODE7; break;
}
return pin_setting;
}

static struct omap_mux* bone_io_pin_lookup( const char* pin_name)
{
int index = 0;
struct omap_mux* mux;

for (;;) {
if (am33xx_mux_get_entry( index, &mux) < 0) {
/* no more entries */
pr_debug( " configuration error, pin '%s' not found in mux database\n",
pin_name);
return NULL;
}
if (mux != NULL &&
mux->muxnames[ 0] != NULL &&
strcmp( mux->muxnames[ 0], pin_name) == 0)
{
/* entry found */
pr_debug( " found pin '%s' at index %d in mux database'\n",
pin_name, index);
return mux;
}
++index;
}
}

static int bone_io_config_pin( const char* pin_name, pin_def eeprom_setting)
{
struct omap_mux* mux;
char* signal_name;
int pin_setting = bone_io_get_mux_setting( eeprom_setting);
int l1, l2;
char full_name[ 50];

if (pin_setting < 0) {
return -1;
}

mux = bone_io_pin_lookup( pin_name);

if (mux == NULL) {
return -1;
}

signal_name = mux->muxnames[ eeprom_setting.mux];

if (signal_name == NULL) {
pr_debug( " Configuration error, no signal found for pin '%s' in mode %d\n",
pin_name, eeprom_setting.mux);
return -1;
}
pr_debug( " setting pin '%s' to signal '%s'\n",
pin_name, signal_name);
l1 = strlen( pin_name);
l2 = strlen( signal_name);

if (l1 + 1 + l2 + 1 > sizeof( full_name)) {
pr_debug( " Internal error, combined signal name too long\n");
return -1;
} else {
memcpy( full_name, pin_name, l1);
full_name[ l1] = '.';
memcpy( full_name + l1 + 1, signal_name, l2);
full_name[ l1 + 1 + l2] = '\0';
if (omap_mux_init_signal( full_name, pin_setting) < 0) {
return -1;
}
pr_debug( " mux '%s' was set to mode 0x%04x\n",
full_name, pin_setting);
}
// return 0 for input, 1 for output
return (pin_setting & AM33XX_PIN_INPUT) ? 0 : 1;
}

#define RULER( x) \
do { \
char* p = status; \
int i = 0; \
int cnt = x; \
status[ cnt] = '\0'; \
while (cnt--) { \
if (++i == 10) { \
*p++ = '+'; \
i = 0; \
} else { \
*p++ = '-'; \
} \
} \
pr_info( "+%s+\n", status); \
} while (0)

static int bone_io_config_from_cape_eeprom( void)
{
int i;
int cnt = BIG_ENDIAN_16( cape_config.numpins);
u16* pmuxdata;
char status[ NR_ITEMS( cape_config.muxdata) + 1];
char revision[ NR_ITEMS( cape_config.format_revision) + 1];

strncpy( revision, cape_config.format_revision, NR_ITEMS( revision) - 1);
revision[ NR_ITEMS( revision) - 1] = '\0';
if (strcmp( revision, "A0") != 0) {
pr_warn( "BeagleBone cape: configuration revision '%s' is not supported\n",
revision);
return -1;
}

// Workaround for capes that have encoded this as ASCII
if (cnt > 256) {
pr_info( "BeagleBone cape: workaround for bad 'numpins' setting\n");
cnt = (cape_config.numpins & 255) - '0';
cnt = 10 * cnt + ((cape_config.numpins >> 8) & 255) - '0';
}
pr_info( "BeagleBone cape: revision %s format, configuring %2d out of %2d signals:\n",
revision, cnt, NR_ITEMS( cape_config.muxdata));
RULER( NR_ITEMS( cape_config.muxdata));
for (i = 0, pmuxdata = cape_config.muxdata ; i < NR_ITEMS( cape_config.muxdata) ; ++i, ++pmuxdata) {
const char* pin_name = cape_pins[ i];
pin_def pin_setting = { .value = BIG_ENDIAN_16( *pmuxdata) };

// Detect broken I2C configuration to prevent bus hangup!
if (i >= 9 && i <= 10) {
status[ i] = '-';
} else if (pin_setting.used) {
switch (bone_io_config_pin( pin_name, pin_setting)) {
case 0: status[ i] = 'i'; break;
case 1: status[ i] = 'o'; break;
default: status[ i] = '#'; break;
}
} else {
status[ i] = ' ';
}
}
status[ NR_ITEMS( cape_config.muxdata)] = '\0';
pr_info( "|%s|\n", status);
RULER( NR_ITEMS( cape_config.muxdata));
return 0;
}

static void beaglebone_cape_setup(struct memory_accessor *mem_acc, void *context)
{
capecount++;
int ret;
char tmp[32];
char name[32];
char version[4];
char manufacturer[32];

capecount++;
/* get cape specific data */
ret = mem_acc->read(mem_acc, (char *)&cape_config, 0, sizeof(cape_config));
if (ret != sizeof(cape_config)) {
Expand All @@ -2215,6 +2514,12 @@ static void beaglebone_cape_setup(struct memory_accessor *mem_acc, void *context
snprintf(tmp, sizeof(cape_config.partnumber) + 1, "%s", cape_config.partnumber);
pr_info("BeagleBone cape partnumber: %s\n", tmp);

if (!strncmp( "BEBOPR", cape_config.name, 6)) {
pr_info( "BeagleBone cape: initializing BEBOPR cape\n");
bone_io_config_from_cape_eeprom();
return; // if configured from eeprom, skip all other initialization
}

if (!strncmp("BB-BONE-DVID-01", cape_config.partnumber, 15)) {
pr_info("BeagleBone cape: initializing DVI cape\n");
dvi_init(0,0);
Expand Down
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