Difference between revisions of "Enabling SPI1 on Linux (Diva)"

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=== Pin Mux Option ===
 
=== Pin Mux Option ===
  
−
SPI1 signals are available at different Diva pins. The following configurations can be used:
+
SPI1 signals are available at different Diva pins. We chose the following configuration:
  
−
==== Option 1 ====
 
 
{|class="wikitable" style="text-align:right"  
 
{|class="wikitable" style="text-align:right"  
 
!| Signal
 
!| Signal
Line 37: Line 36:
 
|J1.69
 
|J1.69
 
|A15
 
|A15
−
|}
 
−
 
−
==== Option 2 ====
 
−
 
−
{{ImportantMessage|text=This configuration can be implemented on the DivaEVB-Lite using the on-board expansion connectors.}}
 
−
 
−
{|class="wikitable" style="text-align:right"
 
−
!| Signal
 
−
!Diva Connector Phisical Pin
 
−
!CPU Ball
 
−
!DivaEVB-Lite signal
 
−
|-
 
−
|SPI1_SCLK
 
−
|J1.150
 
−
|A13
 
−
|J10.7
 
−
|-
 
−
|SPI1_D0
 
−
|J1.140
 
−
|B13
 
−
|J9.15
 
−
|-
 
−
|SPI1_D1
 
−
|J1.142
 
−
|D12
 
−
|J9.17
 
−
|-
 
−
|SPI1_CS0
 
−
|J1.144
 
−
|C12
 
−
|J9.19
 
−
|-
 
−
|SPI1_CS1
 
−
|J1.69
 
−
|A15
 
−
|J11.19
 
 
|}
 
|}
  
Line 78: Line 41:
  
 
{{ImportantMessage|text=The patches below applies to DIVELK 1.0.0 Linux source tree.}}
 
{{ImportantMessage|text=The patches below applies to DIVELK 1.0.0 Linux source tree.}}
−
 
−
==== Option 1 ====
 
  
 
The files <code>arch/arm/mach-omap2/board-diva.c</code> and <code>arch/arm/mach-omap2/diva_pinmux_table.h</code> must be modified according to the following patches:
 
The files <code>arch/arm/mach-omap2/board-diva.c</code> and <code>arch/arm/mach-omap2/diva_pinmux_table.h</code> must be modified according to the following patches:
  
−
<pre>
+
<diff>
 
diff --git a/arch/arm/mach-omap2/board-diva.c b/arch/arm/mach-omap2/board-diva.c
 
diff --git a/arch/arm/mach-omap2/board-diva.c b/arch/arm/mach-omap2/board-diva.c
 
index f6b77fc..a8b3996 100644
 
index f6b77fc..a8b3996 100644
Line 126: Line 87:
 
  {usb0_init, DEV_ON_BASEBOARD, PROFILE_NONE},
 
  {usb0_init, DEV_ON_BASEBOARD, PROFILE_NONE},
 
  {usb1_init, DEV_ON_BASEBOARD, PROFILE_NONE},
 
  {usb1_init, DEV_ON_BASEBOARD, PROFILE_NONE},
−
</pre>
+
</diff>
  
−
<pre>
+
<diff>
 
diff --git a/arch/arm/mach-omap2/diva_pinmux_table.h b/arch/arm/mach-omap2/diva_pinmux_table.h
 
diff --git a/arch/arm/mach-omap2/diva_pinmux_table.h b/arch/arm/mach-omap2/diva_pinmux_table.h
 
index 5a2646a..9509b46 100644
 
index 5a2646a..9509b46 100644
Line 155: Line 116:
 
   * the following mux configurations are un-tested but are left here for
 
   * the following mux configurations are un-tested but are left here for
 
   * reference. They are all comment-out to avoid "defined but not used" warning
 
   * reference. They are all comment-out to avoid "defined but not used" warning
−
</pre>
+
</diff>
−
 
 
−
The kernel must be rebuilt to make these modifications effective.
 
−
 
 
−
 
 
−
==== Option 2 ====
 
−
 
 
−
The files <code>arch/arm/mach-omap2/board-diva.c</code> and <code>arch/arm/mach-omap2/diva_pinmux_table.h</code> must be modified according to the following patches:
 
−
 
 
−
<pre>
 
−
diff --git a/arch/arm/mach-omap2/board-diva.c b/arch/arm/mach-omap2/board-diva.c
 
−
index 42898e9..8f7810d 100644
 
−
--- a/arch/arm/mach-omap2/board-diva.c
 
−
+++ b/arch/arm/mach-omap2/board-diva.c
 
−
@@ -356,6 +356,30 @@ static void spi0_init(int evm_id, int profile)
 
−
ARRAY_SIZE(diva_spi0_slave_info));
 
−
}
 
−
 
−
+/* -------------- SPI 1 Platform Data -----------------------------*/
 
−
+struct spi_board_info __initdata diva_spi1_slave_info[] = {
 
−
+ {
 
−
+ .modalias = "spidev",
 
−
+ .max_speed_hz = 2000000,    /* max spi clock (SCK) speed in HZ */
 
−
+ .bus_num = 2,
 
−
+ .chip_select = 0,
 
−
+ },
 
−
+ {
 
−
+ .modalias = "spidev",
 
−
+ .max_speed_hz = 2000000,    /* max spi clock (SCK) speed in HZ */
 
−
+ .bus_num = 2,
 
−
+ .chip_select = 1,
 
−
+ },
 
−
+};
 
−
+
 
−
+/* setup spi1 */
 
−
+
 
−
+static void spi1_init(int evm_id, int profile)
 
−
+{
 
−
+ setup_pin_mux(spi1_pin_mux);
 
−
+ spi_register_board_info(diva_spi1_slave_info,
 
−
+ ARRAY_SIZE(diva_spi1_slave_info));
 
−
+}
 
−
 
−
/* ----------- NAND Init ---------------------------------------*/
 
−
 
−
@@ -872,11 +896,12 @@ static struct evm_dev_cfg diva_dev_cfg[] = {
 
−
{mmc0_init, DEV_ON_BASEBOARD, PROFILE_NONE},
 
−
{rmii1_init, DEV_ON_BASEBOARD, PROFILE_NONE},
 
−
{spi0_init, DEV_ON_BASEBOARD, PROFILE_NONE},
 
−
+ {spi1_init, DEV_ON_BASEBOARD, PROFILE_NONE},
 
−
{usb0_init, DEV_ON_BASEBOARD, PROFILE_NONE},
 
−
{usb1_init, DEV_ON_BASEBOARD, PROFILE_NONE},
 
−
 
−
{mfd_tscadc_init, DEV_ON_BASEBOARD, PROFILE_NONE},
 
−
- {mcasp0_init,  DEV_ON_BASEBOARD, PROFILE_NONE},
 
−
+ //{mcasp0_init,  DEV_ON_BASEBOARD, PROFILE_NONE},
 
−
 
−
{w1_init, DEV_ON_BASEBOARD, PROFILE_NONE},
 
−
</pre>
 
−
 
 
−
{{ImportantMessage|text=With this pinmux configuration, the SPI1 signals are shared with the McASP0 signals. Thus, for a proper setup, the MCASP0 interface initialization must be disabled in <code>evm_dev_cfg diva_dev_cfg[]</code> (please see the patch above).}}
 
−
 
 
−
<pre>
 
−
diff --git a/arch/arm/mach-omap2/diva_pinmux_table.h b/arch/arm/mach-omap2/diva_pinmux_table.h
 
−
index f6647b0..d2722a3 100644
 
−
--- a/arch/arm/mach-omap2/diva_pinmux_table.h
 
−
+++ b/arch/arm/mach-omap2/diva_pinmux_table.h
 
−
@@ -179,6 +179,19 @@ static struct pinmux_config w1_gpio_pin_mux[] = {
 
−
{NULL, 0},
 
−
};
 
−
 
−
+/* Module pin mux for SPI1 */
 
−
+
 
−
+
 
−
+static struct pinmux_config spi1_pin_mux[] = {
 
−
+ {"mcasp0_aclkx.spi1_sclk", OMAP_MUX_MODE3 | AM33XX_PULL_ENBL | AM33XX_INPUT_EN}, // clock
 
−
+ {"mcasp0_fsx.spi1_d0", OMAP_MUX_MODE3 | AM33XX_PULL_ENBL | AM33XX_PULL_UP | AM33XX_INPUT_EN}, // d0
 
−
+ {"mcasp0_axr0.spi1_d1", OMAP_MUX_MODE3 | AM33XX_PULL_ENBL | AM33XX_INPUT_EN}, // d1
 
−
+ {"mcasp0_ahclkr.spi1_cs0", OMAP_MUX_MODE3 | AM33XX_PULL_ENBL | AM33XX_PULL_UP | AM33XX_INPUT_EN}, // cs0
 
−
+ {"xdma_event_intr0.spi1_cs1", OMAP_MUX_MODE4 | AM33XX_PULL_ENBL | AM33XX_PULL_UP | AM33XX_INPUT_EN}, // cs1
 
−
+ {NULL, 0},
 
−
+};
 
−
+
 
−
+
 
−
/*
 
−
  * the following mux configurations are un-tested but are left here for
 
−
  * reference. They are all comment-out to avoid "defined but not used" warning
 
−
@@ -187,7 +200,7 @@ static struct pinmux_config w1_gpio_pin_mux[] = {
 
−
#ifdef UNUSED_DIVA_PINMUX
 
−
 
−
/* Module pin mux for SPI flash */
 
−
-static struct pinmux_config spi1_pin_mux[] = {
 
−
+/*static struct pinmux_config spi1_pin_mux[] = {
 
−
{"mcasp0_aclkx.spi1_sclk", OMAP_MUX_MODE3 | AM33XX_PULL_ENBL
 
−
| AM33XX_INPUT_EN},
 
−
{"mcasp0_fsx.spi1_d0", OMAP_MUX_MODE3 | AM33XX_PULL_ENBL
 
−
@@ -197,7 +210,7 @@ static struct pinmux_config spi1_pin_mux[] = {
 
−
{"mcasp0_ahclkr.spi1_cs0", OMAP_MUX_MODE3 | AM33XX_PULL_ENBL
 
−
| AM33XX_PULL_UP | AM33XX_INPUT_EN},
 
−
{NULL, 0},
 
−
-};
 
−
+};*/
 
−
 
−
/* Module pin mux for rgmii1 */
 
−
static struct pinmux_config rgmii1_pin_mux[] = {
 
−
</pre>
 
  
 
The kernel must be rebuilt to make these modifications effective.
 
The kernel must be rebuilt to make these modifications effective.
Line 271: Line 127:
 
* https://www.kernel.org/doc/Documentation/spi/spidev_test.c
 
* https://www.kernel.org/doc/Documentation/spi/spidev_test.c
  
−
=== Patch download ===
+
=== Download patch ===
−
 
 
−
* Option 1: [[File:Divelk-spi1-enable.patch.zip]]
 
−
* Option 2: [[File:Divelk-spi1-enable-divaevb-lite.patch.zip]]
 

Revision as of 10:30, 21 June 2013

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Info Box
Diva-am335x-overview.png Applies to Diva
Tux.png Applies to Linux

Introduction[edit | edit source]

This article shows how to enable the SPI1 interface (with CS0 and CS1 chip selects) which can be used in a standard Linux application.

Pin Mux Option[edit | edit source]

SPI1 signals are available at different Diva pins. We chose the following configuration:

Signal Diva Connector Phisical Pin CPU Ball
SPI1_SCLK J1.109 C18
SPI1_D0 J1.31 E18
SPI1_D1 J1.29 E17
SPI1_CS0 J1.144 C12
SPI1_CS1 J1.69 A15

Linux kernel patches[edit | edit source]

200px-Emblem-important.svg.png

The patches below applies to DIVELK 1.0.0 Linux source tree.

The files arch/arm/mach-omap2/board-diva.c and arch/arm/mach-omap2/diva_pinmux_table.h must be modified according to the following patches: 

diff --git a/arch/arm/mach-omap2/board-diva.c b/arch/arm/mach-omap2/board-diva.c
index f6b77fc..a8b3996 100644
--- a/arch/arm/mach-omap2/board-diva.c
+++ b/arch/arm/mach-omap2/board-diva.c
@@ -356,6 +356,30 @@ static void spi0_init(int evm_id, int profile)
 			ARRAY_SIZE(diva_spi0_slave_info));
 }
 
+/* -------------- SPI 1 Platform Data -----------------------------*/
+struct spi_board_info __initdata diva_spi1_slave_info[] = {
+	{
+		.modalias = "spidev",
+		.max_speed_hz = 2000000,     /* max spi clock (SCK) speed in HZ */
+		.bus_num = 2,
+		.chip_select = 0,
+	},
+	{
+		.modalias = "spidev",
+		.max_speed_hz = 2000000,     /* max spi clock (SCK) speed in HZ */
+		.bus_num = 2,
+		.chip_select = 1,
+	},
+};
+
+/* setup spi0 */
+
+static void spi1_init(int evm_id, int profile)
+{
+	setup_pin_mux(spi1_pin_mux);
+	spi_register_board_info(diva_spi1_slave_info,
+			ARRAY_SIZE(diva_spi1_slave_info));
+}
 
 /* ----------- NAND Init ---------------------------------------*/
 
@@ -878,6 +902,7 @@ static struct evm_dev_cfg diva_dev_cfg[] = {
 	{mmc0_init,	DEV_ON_BASEBOARD, PROFILE_NONE},
 	{rmii1_init,	DEV_ON_BASEBOARD, PROFILE_NONE},
 	{spi0_init,	DEV_ON_BASEBOARD, PROFILE_NONE},
+	{spi1_init,	DEV_ON_BASEBOARD, PROFILE_NONE},
 	{usb0_init,	DEV_ON_BASEBOARD, PROFILE_NONE},
 	{usb1_init,	DEV_ON_BASEBOARD, PROFILE_NONE},

diff --git a/arch/arm/mach-omap2/diva_pinmux_table.h b/arch/arm/mach-omap2/diva_pinmux_table.h
index 5a2646a..9509b46 100644
--- a/arch/arm/mach-omap2/diva_pinmux_table.h
+++ b/arch/arm/mach-omap2/diva_pinmux_table.h
@@ -180,6 +180,21 @@ static struct pinmux_config w1_gpio_pin_mux[] = {
 	{NULL, 0},
 };
 
+/* Module pin mux for SPI fash */
+static struct pinmux_config spi1_pin_mux[] = {
+	{"ecap0_in_pwm0_out.spi1_sclk", OMAP_MUX_MODE0 | AM33XX_PULL_ENBL
+							| AM33XX_INPUT_EN},
+	{"uart0_ctsn.spi1_d0", OMAP_MUX_MODE0 | AM33XX_PULL_ENBL | AM33XX_PULL_UP
+							| AM33XX_INPUT_EN},
+	{"uart0_rtsn.spi1_d1", OMAP_MUX_MODE0 | AM33XX_PULL_ENBL
+							| AM33XX_INPUT_EN},
+	{"mcasp0_ahclkr.spi1_cs0", OMAP_MUX_MODE0 | AM33XX_PULL_ENBL | AM33XX_PULL_UP
+							| AM33XX_INPUT_EN},
+	{"xdma_event_intr0.spi1_cs1", OMAP_MUX_MODE0 | AM33XX_PULL_ENBL | AM33XX_PULL_UP
+							| AM33XX_INPUT_EN},
+	{NULL, 0},
+};
+
 /*
  * the following mux configurations are un-tested but are left here for
  * reference. They are all comment-out to avoid "defined but not used" warning

The kernel must be rebuilt to make these modifications effective.

Using the interface[edit | edit source]

Users can access the peripherals connected to the SP1 bus through the spidev interface. For further information, please refer to

Download patch[edit | edit source]

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