[Xen-devel] [PATCH V5 2/4] xen/arm: drivers: scif: Add support for SCIFA compatible UARTs

[Oleksandr Tyshchenko <olekstysh@xxxxxxxxx>]

From: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>

For the driver to be able to handle SCIFA interface as well,
this patch just adds the following:
- SCIFA related macros
- New element in "port_params" array to keep SCIFA specific things
- SCIFA compatible string

This patch makes possible to use existing driver for Renesas "Stout"
board based on R-Car H2 SoC (SCIFA).

Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
Acked-by: Julien Grall <julien.grall@xxxxxxx>

---
    Changes in v3:
        - This patch is a result of splitting an initial patch
          "xen/arm: drivers: scif: Add support for SCIFA compatible UARTs"
          and only adds SCIFA support

    Changes in v4:
        - Remove overrun_bit (SCASSR_ORER) from error_mask

    Changes in v5:
        - Add Julien's A-b
---
 xen/drivers/char/scif-uart.c    | 17 ++++++++++++++++-
 xen/include/asm-arm/scif-uart.h | 40 ++++++++++++++++++++++++++++++++++++++--
 2 files changed, 54 insertions(+), 3 deletions(-)

diff --git a/xen/drivers/char/scif-uart.c b/xen/drivers/char/scif-uart.c
index 85483ee..fa0b827 100644
--- a/xen/drivers/char/scif-uart.c
+++ b/xen/drivers/char/scif-uart.c
@@ -1,7 +1,7 @@
 /*
  * xen/drivers/char/scif-uart.c
  *
- * Driver for SCIF (Serial communication interface with FIFO)
+ * Driver for SCIF(A) (Serial communication interface with FIFO (A))
  * compatible UART.
  *
  * Oleksandr Tyshchenko <oleksandr.tyshchenko@xxxxxxxxxxxxxxx>
@@ -46,6 +46,7 @@ static struct scif_uart {
 enum port_types
 {
     SCIF_PORT,
+    SCIFA_PORT,
     NR_PORTS,
 };
 
@@ -74,6 +75,19 @@ static const struct port_params port_params[NR_PORTS] =
         .irq_flags    = SCSCR_RIE | SCSCR_TIE | SCSCR_REIE,
         .fifo_size    = 16,
     },
+
+    [SCIFA_PORT] =
+    {
+        .status_reg   = SCIFA_SCASSR,
+        .tx_fifo_reg  = SCIFA_SCAFTDR,
+        .rx_fifo_reg  = SCIFA_SCAFRDR,
+        .overrun_reg  = SCIFA_SCASSR,
+        .overrun_mask = SCASSR_ORER,
+        .error_mask   = SCASSR_PER | SCASSR_FER | SCASSR_BRK | SCASSR_ER,
+        .irq_flags    = SCASCR_RIE | SCASCR_TIE | SCASCR_DRIE | SCASCR_ERIE |
+                        SCASCR_BRIE,
+        .fifo_size    = 64,
+    },
 };
 
 static void scif_uart_interrupt(int irq, void *data, struct cpu_user_regs 
*regs)
@@ -273,6 +287,7 @@ static struct uart_driver __read_mostly scif_uart_driver = {
 static const struct dt_device_match scif_uart_dt_match[] __initconst =
 {
     { .compatible = "renesas,scif",  .data = (void *)SCIF_PORT },
+    { .compatible = "renesas,scifa", .data = (void *)SCIFA_PORT },
     { /* sentinel */ },
 };
 
diff --git a/xen/include/asm-arm/scif-uart.h b/xen/include/asm-arm/scif-uart.h
index c343f2f..bce3404 100644
--- a/xen/include/asm-arm/scif-uart.h
+++ b/xen/include/asm-arm/scif-uart.h
@@ -2,7 +2,7 @@
  * xen/include/asm-arm/scif-uart.h
  *
  * Common constant definition between early printk and the UART driver
- * for the SCIF compatible UART.
+ * for the SCIF(A) compatible UART.
  *
  * Oleksandr Tyshchenko <oleksandr.tyshchenko@xxxxxxxxxxxxxxx>
  * Copyright (C) 2014, Globallogic.
@@ -21,7 +21,7 @@
 #ifndef __ASM_ARM_SCIF_UART_H
 #define __ASM_ARM_SCIF_UART_H
 
-/* Register offsets */
+/* Register offsets (SCIF) */
 #define SCIF_SCSMR     (0x00)    /* Serial mode register           */
 #define SCIF_SCBRR     (0x04)    /* Bit rate register              */
 #define SCIF_SCSCR     (0x08)    /* Serial control register        */
@@ -79,6 +79,42 @@
 #define SCFCR_TTRG10    (SCFCR_TTRG1)
 #define SCFCR_TTRG11    (SCFCR_TTRG1 | SCFCR_TTRG0)
 
+/* Register offsets (SCIFA) */
+#define SCIFA_SCASMR     (0x00)    /* Serial mode register           */
+#define SCIFA_SCABRR     (0x04)    /* Bit rate register              */
+#define SCIFA_SCASCR     (0x08)    /* Serial control register        */
+#define SCIFA_SCATDSR    (0x0C)    /* Transmit data stop register    */
+#define SCIFA_SCAFER     (0x10)    /* FIFO error count register      */
+#define SCIFA_SCASSR     (0x14)    /* Serial status register         */
+#define SCIFA_SCAFCR     (0x18)    /* FIFO control register          */
+#define SCIFA_SCAFDR     (0x1C)    /* FIFO data count register       */
+#define SCIFA_SCAFTDR    (0x20)    /* Transmit FIFO data register    */
+#define SCIFA_SCAFRDR    (0x24)    /* Receive FIFO data register     */
+#define SCIFA_SCAPCR     (0x30)    /* Serial port control register   */
+#define SCIFA_SCAPDR     (0x34)    /* Serial port data register      */
+
+/* Serial Control Register (SCASCR) */
+#define SCASCR_ERIE     (1 << 10)    /* Receive Error Interrupt Enable */
+#define SCASCR_BRIE     (1 << 9)     /* Break Interrupt Enable */
+#define SCASCR_DRIE     (1 << 8)     /* Receive Data Ready Interrupt Enable */
+#define SCASCR_TIE      (1 << 7)     /* Transmit Interrupt Enable */
+#define SCASCR_RIE      (1 << 6)     /* Receive Interrupt Enable */
+#define SCASCR_TE       (1 << 5)     /* Transmit Enable */
+#define SCASCR_RE       (1 << 4)     /* Receive Enable */
+#define SCASCR_CKE0     (1 << 0)     /* Clock Enable 0 */
+
+/* Serial Status Register (SCASSR) */
+#define SCASSR_ORER    (1 << 9)    /* Overrun Error */
+#define SCASSR_TSF     (1 << 8)    /* Transmit Data Stop */
+#define SCASSR_ER      (1 << 7)    /* Receive Error */
+#define SCASSR_TEND    (1 << 6)    /* Transmission End */
+#define SCASSR_TDFE    (1 << 5)    /* Transmit FIFO Data Empty */
+#define SCASSR_BRK     (1 << 4)    /* Break Detect */
+#define SCASSR_FER     (1 << 3)    /* Framing Error */
+#define SCASSR_PER     (1 << 2)    /* Parity Error */
+#define SCASSR_RDF     (1 << 1)    /* Receive FIFO Data Full */
+#define SCASSR_DR      (1 << 0)    /* Receive Data Ready */
+
 #endif /* __ASM_ARM_SCIF_UART_H */
 
 /*
-- 
2.7.4


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