From 716ca530e1c4515d8683c9d5be3d56b301758b66 Mon Sep 17 00:00:00 2001
From: James <>
Date: Wed, 4 Nov 2015 11:49:21 +0000
Subject: trunk-47381

---
 .../ixp4xx/patches-3.18/160-delayed_uart_io.patch  | 121 +++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 target/linux/ixp4xx/patches-3.18/160-delayed_uart_io.patch

(limited to 'target/linux/ixp4xx/patches-3.18/160-delayed_uart_io.patch')

diff --git a/target/linux/ixp4xx/patches-3.18/160-delayed_uart_io.patch b/target/linux/ixp4xx/patches-3.18/160-delayed_uart_io.patch
new file mode 100644
index 0000000..54dc905
--- /dev/null
+++ b/target/linux/ixp4xx/patches-3.18/160-delayed_uart_io.patch
@@ -0,0 +1,121 @@
+--- a/drivers/tty/serial/8250/8250_core.c
++++ b/drivers/tty/serial/8250/8250_core.c
+@@ -416,6 +416,20 @@ static void mem_serial_out(struct uart_p
+ 	writeb(value, p->membase + offset);
+ }
+ 
++static unsigned int memdelay_serial_in(struct uart_port *p, int offset)
++{
++	struct uart_8250_port *up = (struct uart_8250_port *)p;
++	udelay(up->port.rw_delay);
++	return mem_serial_in(p, offset);
++}
++
++static void memdelay_serial_out(struct uart_port *p, int offset, int value)
++{
++	struct uart_8250_port *up = (struct uart_8250_port *)p;
++	udelay(up->port.rw_delay);
++	mem_serial_out(p, offset, value);
++}
++
+ static void mem32_serial_out(struct uart_port *p, int offset, int value)
+ {
+ 	offset = offset << p->regshift;
+@@ -466,6 +480,11 @@ static void set_io_from_upio(struct uart
+ 		p->serial_out = mem32_serial_out;
+ 		break;
+ 
++	case UPIO_MEM_DELAY:
++		p->serial_in = memdelay_serial_in;
++		p->serial_out = memdelay_serial_out;
++		break;
++
+ #if defined(CONFIG_MIPS_ALCHEMY) || defined(CONFIG_SERIAL_8250_RT288X)
+ 	case UPIO_AU:
+ 		p->serial_in = au_serial_in;
+@@ -491,6 +510,7 @@ serial_port_out_sync(struct uart_port *p
+ 	switch (p->iotype) {
+ 	case UPIO_MEM:
+ 	case UPIO_MEM32:
++	case UPIO_MEM_DELAY:
+ 	case UPIO_AU:
+ 		p->serial_out(p, offset, value);
+ 		p->serial_in(p, UART_LCR);	/* safe, no side-effects */
+@@ -2655,6 +2675,7 @@ static int serial8250_request_std_resour
+ 	case UPIO_TSI:
+ 	case UPIO_MEM32:
+ 	case UPIO_MEM:
++	case UPIO_MEM_DELAY:
+ 		if (!port->mapbase)
+ 			break;
+ 
+@@ -2691,6 +2712,7 @@ static void serial8250_release_std_resou
+ 	case UPIO_TSI:
+ 	case UPIO_MEM32:
+ 	case UPIO_MEM:
++	case UPIO_MEM_DELAY:
+ 		if (!port->mapbase)
+ 			break;
+ 
+@@ -3424,6 +3446,7 @@ static int serial8250_probe(struct platf
+ 		uart.port.set_termios	= p->set_termios;
+ 		uart.port.pm		= p->pm;
+ 		uart.port.dev		= &dev->dev;
++		uart.port.rw_delay	= p->rw_delay;
+ 		uart.port.irqflags	|= irqflag;
+ 		ret = serial8250_register_8250_port(&uart);
+ 		if (ret < 0) {
+@@ -3580,6 +3603,7 @@ int serial8250_register_8250_port(struct
+ 		uart->port.flags        = up->port.flags | UPF_BOOT_AUTOCONF;
+ 		uart->bugs		= up->bugs;
+ 		uart->port.mapbase      = up->port.mapbase;
++		uart->port.rw_delay	= up->port.rw_delay;
+ 		uart->port.private_data = up->port.private_data;
+ 		uart->port.fifosize	= up->port.fifosize;
+ 		uart->tx_loadsz		= up->tx_loadsz;
+--- a/drivers/tty/serial/serial_core.c
++++ b/drivers/tty/serial/serial_core.c
+@@ -2090,6 +2090,7 @@ uart_report_port(struct uart_driver *drv
+ 		snprintf(address, sizeof(address),
+ 			 "I/O 0x%lx offset 0x%x", port->iobase, port->hub6);
+ 		break;
++	case UPIO_MEM_DELAY:
+ 	case UPIO_MEM:
+ 	case UPIO_MEM32:
+ 	case UPIO_AU:
+@@ -2736,6 +2737,7 @@ int uart_match_port(struct uart_port *po
+ 	case UPIO_HUB6:
+ 		return (port1->iobase == port2->iobase) &&
+ 		       (port1->hub6   == port2->hub6);
++	case UPIO_MEM_DELAY:
+ 	case UPIO_MEM:
+ 	case UPIO_MEM32:
+ 	case UPIO_AU:
+--- a/include/linux/serial_8250.h
++++ b/include/linux/serial_8250.h
+@@ -27,6 +27,7 @@ struct plat_serial8250_port {
+ 	void            *private_data;
+ 	unsigned char	regshift;	/* register shift */
+ 	unsigned char	iotype;		/* UPIO_* */
++	unsigned int rw_delay;	/* udelay for slower busses IXP4XX Expansion Bus */
+ 	unsigned char	hub6;
+ 	upf_t		flags;		/* UPF_* flags */
+ 	unsigned int	type;		/* If UPF_FIXED_TYPE */
+--- a/include/linux/serial_core.h
++++ b/include/linux/serial_core.h
+@@ -146,6 +146,7 @@ struct uart_port {
+ #define UPIO_MEM32		(3)
+ #define UPIO_AU			(4)			/* Au1x00 and RT288x type IO */
+ #define UPIO_TSI		(5)			/* Tsi108/109 type IO */
++#define UPIO_MEM_DELAY		(6)
+ 
+ 	unsigned int		read_status_mask;	/* driver specific */
+ 	unsigned int		ignore_status_mask;	/* driver specific */
+@@ -202,6 +203,7 @@ struct uart_port {
+ 	int			hw_stopped;		/* sw-assisted CTS flow state */
+ 	unsigned int		mctrl;			/* current modem ctrl settings */
+ 	unsigned int		timeout;		/* character-based timeout */
++	unsigned int		rw_delay;		/* udelay for slow busses, IXP4XX Expansion Bus */
+ 	unsigned int		type;			/* port type */
+ 	const struct uart_ops	*ops;
+ 	unsigned int		custom_divisor;
-- 
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