drivers: Add Atmel SAM I2S (SSC) driver

Added Inter-IC Sound driver (based on SSC module) for Atmel
SAM MCU family.

Tested on Atmel SMART SAM E70 Xplained board

Origin: Original

Jira: ZEP-2509
Signed-off-by: Piotr Mienkowski <piotr.mienkowski@gmail.com>

arch/arm/soc/atmel_sam/same70/soc_pinmap.h

@@ -100,6 +100,24 @@
 #define PINS_USART2 {PIN_USART2_RXD, PIN_USART2_TXD, PIN_USART2_CTS, \
 	  PIN_USART2_RTS, PIN_USART2_SCK}
 
+/* Synchronous Serial Controller (SSC) */
+
+#define PIN_SSC0_RD {PIO_PA10C_SSC_RD, PIOA, ID_PIOA, SOC_GPIO_FUNC_C}
+#define PIN_SSC0_RF {PIO_PD24B_SSC_RF, PIOD, ID_PIOD, SOC_GPIO_FUNC_B}
+#define PIN_SSC0_RK {PIO_PA22A_SSC_RK, PIOA, ID_PIOA, SOC_GPIO_FUNC_A}
+#ifdef CONFIG_I2S_SAM_SSC_0_PIN_TD_PB5
+#define PIN_SSC0_TD {PIO_PB5D_SSC_TD,  PIOB, ID_PIOB, SOC_GPIO_FUNC_D}
+#elif CONFIG_I2S_SAM_SSC_0_PIN_TD_PD10
+#define PIN_SSC0_TD {PIO_PD10C_SSC_TD, PIOD, ID_PIOD, SOC_GPIO_FUNC_C}
+#elif CONFIG_I2S_SAM_SSC_0_PIN_TD_PD26
+#define PIN_SSC0_TD {PIO_PD26B_SSC_TD, PIOD, ID_PIOD, SOC_GPIO_FUNC_B}
+#endif
+#define PIN_SSC0_TF {PIO_PB0D_SSC_TF,  PIOB, ID_PIOB, SOC_GPIO_FUNC_D}
+#define PIN_SSC0_TK {PIO_PB1D_SSC_TK,  PIOB, ID_PIOB, SOC_GPIO_FUNC_D}
+
+#define PINS_SSC0 {PIN_SSC0_RD, PIN_SSC0_RF, PIN_SSC0_RK, PIN_SSC0_TD, \
+	  PIN_SSC0_TF, PIN_SSC0_TK}
+
 /* Two-wire Interface (TWIHS) */
 
 #define PIN_TWIHS0_TWCK {PIO_PA4A_TWIHS0_TWCK0, PIOA, ID_PIOA, SOC_GPIO_FUNC_A}

boards/arm/sam_e70_xplained/Kconfig.defconfig

@@ -10,6 +10,17 @@ config BOARD
 	string
 	default sam_e70_xplained
 
+if I2S
+config I2S_SAM_SSC
+	default y
+
+config I2S_SAM_SSC_0_DMA_RX_CHANNEL
+	default 22
+
+config I2S_SAM_SSC_0_DMA_TX_CHANNEL
+	default 23
+endif # I2S
+
 if ETH_SAM_GMAC
 
 # Read MAC address from AT24MAC402 EEPROM

drivers/i2s/CMakeLists.txt

@@ -0,0 +1 @@
+zephyr_sources_ifdef(CONFIG_I2S_SAM_SSC		i2s_sam_ssc.c)

drivers/i2s/Kconfig.sam_ssc

@@ -0,0 +1,88 @@
+# Kconfig - Atmel SAM I2S bus driver configuration options
+#
+# Copyright (c) 2017 Piotr Mienkowski
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+menuconfig I2S_SAM_SSC
+	bool "Atmel SAM MCU family I2S (SSC) Bus Driver"
+	depends on SOC_FAMILY_SAM
+	select DMA
+	default n
+	help
+	Enable Inter Sound (I2S) bus driver for Atmel SAM MCU family based on
+	Synchronous Serial Controller (SSC) module.
+
+if I2S_SAM_SSC
+
+config I2S_SAM_SSC_RX_BLOCK_COUNT
+	int "RX queue length"
+	default 4
+
+config I2S_SAM_SSC_TX_BLOCK_COUNT
+	int "TX queue length"
+	default 4
+
+config I2S_SAM_SSC_0_NAME
+	string "I2S 0 device name"
+	default "I2S_0"
+
+config I2S_SAM_SSC_0_IRQ_PRI
+	int "Interrupt priority"
+	default 0
+
+config I2S_SAM_SSC_DMA_NAME
+	string "DMA device name"
+	default "DMA_0"
+	help
+	  Name of the DMA device this device driver can use.
+
+config I2S_SAM_SSC_0_DMA_RX_CHANNEL
+	int "DMA RX channel"
+	help
+	  DMA channel number to use for RX transfers.
+
+config I2S_SAM_SSC_0_DMA_TX_CHANNEL
+	int "DMA TX channel"
+	help
+	  DMA channel number to use for TX transfers.
+
+choice I2S_SAM_SSC_0_PIN_TD_SELECT
+	prompt "TD pin"
+	depends on SOC_SERIES_SAME70
+
+	config I2S_SAM_SSC_0_PIN_TD_PB5
+		bool "PB5"
+
+	config I2S_SAM_SSC_0_PIN_TD_PD10
+		bool "PD10"
+
+	config I2S_SAM_SSC_0_PIN_TD_PD26
+		bool "PD26"
+
+endchoice # I2S_SAM_SSC_0_PIN_TD_SELECT
+
+config I2S_SAM_SSC_0_PIN_RF_EN
+	bool "RF pin enabled"
+	default y
+	help
+	  If enabled RF signal is connected to RF pin. It will be configured as
+	  an output or an input depending on whether the receiver is working
+	  in master or slave mode.
+
+	  If disabled RF signal is disconnected from RF pin and connected
+	  internally to TF (Transmitter Frame Synchro signal).
+
+config I2S_SAM_SSC_0_PIN_RK_EN
+	bool "RK pin enabled"
+	default y
+	help
+	  If enabled RK signal is connected to RK pin. It will be configured as
+	  an output or an input depending on whether the receiver is working
+	  in master or slave mode.
+
+	  If disabled RK signal is disconnected from RK pin and connected
+	  internally to TK (Transmitter Clock signal).
+
+endif # I2S_SAM_SSC