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Subject[PATCH 7/9] Serial:8250: New Port Type PORT_AMD_8250
Date
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@amd.com>
---
drivers/acpi/acpi_apd.c | 10 ++++++++++
drivers/tty/serial/8250/8250_dw.c | 16 ++++++++++++++++
drivers/tty/serial/8250/8250_port.c | 9 +++++++++
include/linux/serial_8250.h | 4 ++++
include/uapi/linux/serial_core.h | 3 ++-
include/uapi/linux/serial_reg.h | 2 ++
6 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/acpi_apd.c b/drivers/acpi/acpi_apd.c
index 906a20f..787f477 100644
--- a/drivers/acpi/acpi_apd.c
+++ b/drivers/acpi/acpi_apd.c
@@ -23,6 +23,7 @@
#include <linux/sizes.h>
#include <linux/amba/pl330.h>
#include <linux/interrupt.h>
+#include <linux/serial_8250.h>

#include "internal.h"

@@ -49,6 +50,10 @@ static struct dma_pl330_platdata amd_pl330 = {
.acpi_xlate_filter = apd_acpi_xlate_filter,
};

+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;
@@ -164,6 +169,11 @@ static int acpi_apd_create_device(struct acpi_device *adev,
goto err_out;

if (!strncmp(pdev->name, "AMD0020", 7)) {
+ ret = platform_device_add_data(pdev, &amd_dw8250,
+ sizeof(amd_dw8250));
+ if (ret)
+ goto err_out;
+
memset(&amba_quirks, 0, sizeof(amba_quirks));
setup_quirks(pdev, &amba_quirks);

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index a5d319e..a5ae9b6 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -66,6 +66,8 @@ struct dw8250_data {

unsigned int skip_autocfg:1;
unsigned int uart_16550_compatible:1;
+
+ unsigned has_pl330_dma:1;
};

#define BYT_PRV_CLK 0x800
@@ -304,6 +306,7 @@ static void dw8250_setup_port(struct uart_port *p)
{
struct uart_8250_port *up = up_to_u8250p(p);
u32 reg;
+ struct dw8250_data *d = p->private_data;

/*
* If the Component Version Register returns zero, we know that
@@ -326,6 +329,16 @@ 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 (d->has_pl330_dma) {
+ p->type = PORT_AMD_8250;
+ p->flags |= UPF_SHARE_IRQ;
+
+ 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 |
+ UART_FCR_DMA_SELECT;
+ up->tx_loadsz = p->fifosize / 2;
+ }
}

if (reg & DW_UART_CPR_AFCE_MODE)
@@ -339,6 +352,7 @@ 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 +482,7 @@ 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 +490,7 @@ 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..b258edc 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 | UART_FCR_DMA_SELECT,
+ .rxtrig_bytes = {1, 4, 8},
+ .flags = UART_CAP_FIFO,
+ },
};

/* Uart divisor latch read */
diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h
index faa0e03..4652783 100644
--- a/include/linux/serial_8250.h
+++ b/include/linux/serial_8250.h
@@ -42,6 +42,10 @@ struct plat_serial8250_port {
void (*handle_break)(struct uart_port *);
};

+struct plat_dw8250_data {
+ unsigned has_pl330_dma:1;
+};
+
/*
* Allocate 8250 platform device IDs. Nothing is implied by
* the numbering here, except for the legacy entry being -1.
diff --git a/include/uapi/linux/serial_core.h b/include/uapi/linux/serial_core.h
index 93ba148..6a06651 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..13e8294 100644
--- a/include/uapi/linux/serial_reg.h
+++ b/include/uapi/linux/serial_reg.h
@@ -25,6 +25,8 @@
#define UART_IER_RLSI 0x04 /* Enable receiver line status interrupt */
#define UART_IER_THRI 0x02 /* Enable Transmitter holding register int. */
#define UART_IER_RDI 0x01 /* Enable receiver data interrupt */
+/* Enable Programmable Transmitter holding register int. */
+#define UART_IER_PTIME 0x80
/*
* Sleep mode for ST16650 and TI16750. For the ST16650, EFR[4]=1
*/
--
1.9.1


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