[PATCH 6/6] Serial:8250: New Port Type PORT_AMD_8250
From: Wang Hongcheng
Date: Mon Jan 04 2016 - 00:33:59 EST
Set a new port type for AMD Carrizo. Add has_pl330_dma to 8250_dw's
private data and init fcr,ier as well as dma rx size.
Signed-off-by: Wang Hongcheng <annie.wang@xxxxxxx>
---
drivers/acpi/acpi_apd.c | 11 +++++++++++
drivers/tty/serial/8250/8250_dw.c | 15 +++++++++++++++
drivers/tty/serial/8250/8250_port.c | 9 +++++++++
include/linux/platform_data/8250-dw.h | 8 ++++++++
include/uapi/linux/serial_core.h | 3 ++-
include/uapi/linux/serial_reg.h | 1 +
6 files changed, 46 insertions(+), 1 deletion(-)
create mode 100644 include/linux/platform_data/8250-dw.h
diff --git a/drivers/acpi/acpi_apd.c b/drivers/acpi/acpi_apd.c
index 1f16cca..e8e43fb 100644
--- a/drivers/acpi/acpi_apd.c
+++ b/drivers/acpi/acpi_apd.c
@@ -23,6 +23,7 @@
#include <linux/dmaengine.h>
#include <linux/interrupt.h>
#include <linux/amba/pl330.h>
+#include <linux/platform_data/8250-dw.h>
#include "internal.h"
@@ -56,6 +57,11 @@ static struct dma_pl330_platdata amd_pl330[] = {
.num = 0,
}
};
+
+static struct plat_dw8250_data amd_dw8250 = {
+ .has_pl330_dma = 1,
+};
+
/**
* struct apd_device_desc - a descriptor for apd device
* @flags: device flags like %ACPI_APD_SYSFS, %ACPI_APD_PM
@@ -115,6 +121,11 @@ static int acpi_apd_setup_quirks(struct apd_private_data *pdata)
char amba_devname[100];
int devnum;
+ ret = platform_device_add_data(pdev, &amd_dw8250,
+ sizeof(amd_dw8250));
+ if (ret)
+ goto resource_alloc_err;
+
resource = kzalloc(sizeof(*resource), GFP_KERNEL);
if (!resource)
goto resource_alloc_err;
diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index a5d319e..e7d9f01 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -27,6 +27,7 @@
#include <linux/clk.h>
#include <linux/reset.h>
#include <linux/pm_runtime.h>
+#include <linux/platform_data/8250-dw.h>
#include <asm/byteorder.h>
@@ -66,6 +67,7 @@ struct dw8250_data {
unsigned int skip_autocfg:1;
unsigned int uart_16550_compatible:1;
+ unsigned int has_pl330_dma:1;
};
#define BYT_PRV_CLK 0x800
@@ -303,6 +305,7 @@ static void dw8250_quirks(struct uart_port *p, struct dw8250_data *data)
static void dw8250_setup_port(struct uart_port *p)
{
struct uart_8250_port *up = up_to_u8250p(p);
+ struct dw8250_data *data = p->private_data;
u32 reg;
/*
@@ -326,6 +329,14 @@ static void dw8250_setup_port(struct uart_port *p)
p->flags |= UPF_FIXED_TYPE;
p->fifosize = DW_UART_CPR_FIFO_SIZE(reg);
up->capabilities = UART_CAP_FIFO;
+ if (data->has_pl330_dma) {
+ p->type = PORT_AMD_8250;
+
+ up->ier |= UART_IER_PTIME | UART_IER_THRI |
+ UART_IER_RLSI | UART_IER_RDI;
+ up->fcr |= UART_FCR_R_TRIG_10 | UART_FCR_T_TRIG_11;
+ up->tx_loadsz = p->fifosize / 2;
+ }
}
if (reg & DW_UART_CPR_AFCE_MODE)
@@ -339,6 +350,7 @@ static int dw8250_probe(struct platform_device *pdev)
int irq = platform_get_irq(pdev, 0);
struct uart_port *p = &uart.port;
struct dw8250_data *data;
+ struct plat_dw8250_data *pdata = dev_get_platdata(&pdev->dev);
int err;
u32 val;
@@ -468,6 +480,7 @@ static int dw8250_probe(struct platform_device *pdev)
p->handle_irq = NULL;
}
+ data->has_pl330_dma = pdata ? pdata->has_pl330_dma : 0;
if (!data->skip_autocfg)
dw8250_setup_port(p);
@@ -475,6 +488,8 @@ static int dw8250_probe(struct platform_device *pdev)
if (p->fifosize) {
data->dma.rxconf.src_maxburst = p->fifosize / 4;
data->dma.txconf.dst_maxburst = p->fifosize / 4;
+ data->dma.rx_size
+ = data->has_pl330_dma ? (p->fifosize / 2 + 2) : 0;
uart.dma = &data->dma;
}
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 52d82d2..b89a326 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -269,6 +269,15 @@ configured less than Maximum supported fifo bytes */
.rxtrig_bytes = {1, 4, 8, 14},
.flags = UART_CAP_FIFO,
},
+ [PORT_AMD_8250] = {
+ .name = "AMD_8250",
+ .fifo_size = 256,
+ .tx_loadsz = 128,
+ .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10 |
+ UART_FCR_T_TRIG_11,
+ .rxtrig_bytes = {1, 4, 8},
+ .flags = UART_CAP_FIFO,
+ },
};
/* Uart divisor latch read */
diff --git a/include/linux/platform_data/8250-dw.h b/include/linux/platform_data/8250-dw.h
new file mode 100644
index 0000000..97cdb9d
--- /dev/null
+++ b/include/linux/platform_data/8250-dw.h
@@ -0,0 +1,8 @@
+#ifndef _PLATFORM_DATA_8250_DW_H
+#define _PLATFORM_DATA_8250_DW_H
+
+struct plat_dw8250_data {
+ unsigned int has_pl330_dma:1;
+};
+
+#endif
diff --git a/include/uapi/linux/serial_core.h b/include/uapi/linux/serial_core.h
index 93ba148..89d44b0 100644
--- a/include/uapi/linux/serial_core.h
+++ b/include/uapi/linux/serial_core.h
@@ -56,7 +56,8 @@
#define PORT_ALTR_16550_F128 28 /* Altera 16550 UART with 128 FIFOs */
#define PORT_RT2880 29 /* Ralink RT2880 internal UART */
#define PORT_16550A_FSL64 30 /* Freescale 16550 UART with 64 FIFOs */
-#define PORT_MAX_8250 30 /* max port ID */
+#define PORT_AMD_8250 31
+#define PORT_MAX_8250 32 /* max port ID */
/*
* ARM specific type numbers. These are not currently guaranteed
diff --git a/include/uapi/linux/serial_reg.h b/include/uapi/linux/serial_reg.h
index 1e5ac4e7..66686b9 100644
--- a/include/uapi/linux/serial_reg.h
+++ b/include/uapi/linux/serial_reg.h
@@ -20,6 +20,7 @@
#define UART_RX 0 /* In: Receive buffer */
#define UART_TX 0 /* Out: Transmit buffer */
+#define UART_IER_PTIME 0x80 /* Enable Programmable Transmitter holding register int. */
#define UART_IER 1 /* Out: Interrupt Enable Register */
#define UART_IER_MSI 0x08 /* Enable Modem status interrupt */
#define UART_IER_RLSI 0x04 /* Enable receiver line status interrupt */
--
1.9.1
--
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