[PATCH 3/3] amba-pl011: add st specific init
Jean-Christophe PLAGNIOL-VILLARD
plagnioj at jcrosoft.com
Tue Sep 11 00:51:09 EDT 2012
This is need on the new IP for ux500
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
---
drivers/serial/amba-pl011.c | 40 ++++++++++++++++++++++++++++++++++++++--
include/linux/amba/serial.h | 29 +++++++++++++++++++++++++++++
2 files changed, 67 insertions(+), 2 deletions(-)
diff --git a/drivers/serial/amba-pl011.c b/drivers/serial/amba-pl011.c
index 77f8c8a..b62dc9f 100644
--- a/drivers/serial/amba-pl011.c
+++ b/drivers/serial/amba-pl011.c
@@ -45,6 +45,23 @@ struct amba_uart_port {
struct console_device uart; /* uart */
struct clk *clk; /* uart clock */
u32 uartclk;
+ struct vendor_data *vendor;
+};
+
+/* There is by now at least one vendor with differing details, so handle it */
+struct vendor_data {
+ unsigned int lcrh_tx;
+ unsigned int lcrh_rx;
+};
+
+static struct vendor_data vendor_arm = {
+ .lcrh_tx = UART011_LCRH,
+ .lcrh_rx = UART011_LCRH,
+};
+
+static struct vendor_data vendor_st = {
+ .lcrh_tx = ST_UART011_LCRH_TX,
+ .lcrh_rx = ST_UART011_LCRH_RX,
};
static inline struct amba_uart_port *
@@ -117,6 +134,23 @@ static int pl011_tstc(struct console_device *cdev)
return !(readl(uart->base + UART01x_FR) & UART01x_FR_RXFE);
}
+static void pl011_rlcr(struct amba_uart_port *uart, u32 lcr)
+{
+ struct vendor_data *vendor = uart->vendor;
+
+ writew(lcr, uart->base + vendor->lcrh_rx);
+ if (vendor->lcrh_tx != vendor->lcrh_rx) {
+ int i;
+ /*
+ * Wait 10 PCLKs before writing LCRH_TX register,
+ * to get this delay write read only register 10 times
+ */
+ for (i = 0; i < 10; ++i)
+ writew(0xff, uart->base + UART011_MIS);
+ writew(lcr, uart->base + vendor->lcrh_tx);
+ }
+}
+
int pl011_init_port (struct console_device *cdev)
{
struct amba_uart_port *uart = to_amba_uart_port(cdev);
@@ -140,8 +174,7 @@ int pl011_init_port (struct console_device *cdev)
/*
** Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled.
*/
- writel((UART01x_LCRH_WLEN_8 | UART01x_LCRH_FEN),
- uart->base + UART011_LCRH);
+ pl011_rlcr(uart, UART01x_LCRH_WLEN_8 | UART01x_LCRH_FEN);
/*
** Finally, enable the UART
@@ -160,6 +193,7 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id)
uart = xzalloc(sizeof(struct amba_uart_port));
uart->clk = clk_get(&dev->dev, NULL);
uart->base = amba_get_mem_region(dev);
+ uart->vendor = (void*)id->data;
if (IS_ERR(uart->clk))
return PTR_ERR(uart->clk);
@@ -185,10 +219,12 @@ static struct amba_id pl011_ids[] = {
{
.id = 0x00041011,
.mask = 0x000fffff,
+ .data = &vendor_arm,
},
{
.id = 0x00380802,
.mask = 0x00ffffff,
+ .data = &vendor_st,
},
{ 0, 0 },
};
diff --git a/include/linux/amba/serial.h b/include/linux/amba/serial.h
index f4d7bf8..6670f1f 100644
--- a/include/linux/amba/serial.h
+++ b/include/linux/amba/serial.h
@@ -32,16 +32,20 @@
#define UART01x_RSR 0x04 /* Receive status register (Read). */
#define UART01x_ECR 0x04 /* Error clear register (Write). */
#define UART010_LCRH 0x08 /* Line control register, high byte. */
+#define ST_UART011_DMAWM 0x08 /* DMA watermark configure register. */
#define UART010_LCRM 0x0C /* Line control register, middle byte. */
+#define ST_UART011_TIMEOUT 0x0C /* Timeout period register. */
#define UART010_LCRL 0x10 /* Line control register, low byte. */
#define UART010_CR 0x14 /* Control register. */
#define UART01x_FR 0x18 /* Flag register (Read only). */
#define UART010_IIR 0x1C /* Interrupt indentification register (Read). */
#define UART010_ICR 0x1C /* Interrupt clear register (Write). */
+#define ST_UART011_LCRH_RX 0x1C /* Rx line control register. */
#define UART01x_ILPR 0x20 /* IrDA low power counter register. */
#define UART011_IBRD 0x24 /* Integer baud rate divisor register. */
#define UART011_FBRD 0x28 /* Fractional baud rate divisor register. */
#define UART011_LCRH 0x2c /* Line control register. */
+#define ST_UART011_LCRH_TX 0x2c /* Tx Line control register. */
#define UART011_CR 0x30 /* Control register. */
#define UART011_IFLS 0x34 /* Interrupt fifo level select. */
#define UART011_IMSC 0x38 /* Interrupt mask. */
@@ -49,6 +53,15 @@
#define UART011_MIS 0x40 /* Masked interrupt status. */
#define UART011_ICR 0x44 /* Interrupt clear register. */
#define UART011_DMACR 0x48 /* DMA control register. */
+#define ST_UART011_XFCR 0x50 /* XON/XOFF control register. */
+#define ST_UART011_XON1 0x54 /* XON1 register. */
+#define ST_UART011_XON2 0x58 /* XON2 register. */
+#define ST_UART011_XOFF1 0x5C /* XON1 register. */
+#define ST_UART011_XOFF2 0x60 /* XON2 register. */
+#define ST_UART011_ITCR 0x80 /* Integration test control register. */
+#define ST_UART011_ITIP 0x84 /* Integration test input register. */
+#define ST_UART011_ABCR 0x100 /* Autobaud control register. */
+#define ST_UART011_ABIMSC 0x15C /* Autobaud interrupt mask/clear register. */
#define UART011_DR_OE (1 << 11)
#define UART011_DR_BE (1 << 10)
@@ -84,6 +97,7 @@
#define UART010_CR_TIE 0x0020
#define UART010_CR_RIE 0x0010
#define UART010_CR_MSIE 0x0008
+#define ST_UART011_CR_OVSFACT 0x0008 /* Oversampling factor */
#define UART01x_CR_IIRLP 0x0004 /* SIR low power mode */
#define UART01x_CR_SIREN 0x0002 /* SIR enable */
#define UART01x_CR_UARTEN 0x0001 /* UART enable */
@@ -99,6 +113,21 @@
#define UART01x_LCRH_PEN 0x02
#define UART01x_LCRH_BRK 0x01
+#define ST_UART011_DMAWM_RX_1 (0 << 3)
+#define ST_UART011_DMAWM_RX_2 (1 << 3)
+#define ST_UART011_DMAWM_RX_4 (2 << 3)
+#define ST_UART011_DMAWM_RX_8 (3 << 3)
+#define ST_UART011_DMAWM_RX_16 (4 << 3)
+#define ST_UART011_DMAWM_RX_32 (5 << 3)
+#define ST_UART011_DMAWM_RX_48 (6 << 3)
+#define ST_UART011_DMAWM_TX_1 0
+#define ST_UART011_DMAWM_TX_2 1
+#define ST_UART011_DMAWM_TX_4 2
+#define ST_UART011_DMAWM_TX_8 3
+#define ST_UART011_DMAWM_TX_16 4
+#define ST_UART011_DMAWM_TX_32 5
+#define ST_UART011_DMAWM_TX_48 6
+
#define UART010_IIR_RTIS 0x08
#define UART010_IIR_TIS 0x04
#define UART010_IIR_RIS 0x02
--
1.7.10.4
More information about the barebox
mailing list