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122 lines
4.0 KiB
Diff
122 lines
4.0 KiB
Diff
--- a/drivers/tty/serial/8250/8250_core.c
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+++ b/drivers/tty/serial/8250/8250_core.c
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@@ -416,6 +416,20 @@ static void mem_serial_out(struct uart_p
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writeb(value, p->membase + offset);
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}
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+static unsigned int memdelay_serial_in(struct uart_port *p, int offset)
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+{
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+ struct uart_8250_port *up = (struct uart_8250_port *)p;
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+ udelay(up->port.rw_delay);
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+ return mem_serial_in(p, offset);
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+}
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+
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+static void memdelay_serial_out(struct uart_port *p, int offset, int value)
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+{
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+ struct uart_8250_port *up = (struct uart_8250_port *)p;
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+ udelay(up->port.rw_delay);
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+ mem_serial_out(p, offset, value);
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+}
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+
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static void mem32_serial_out(struct uart_port *p, int offset, int value)
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{
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offset = offset << p->regshift;
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@@ -466,6 +480,11 @@ static void set_io_from_upio(struct uart
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p->serial_out = mem32_serial_out;
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break;
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+ case UPIO_MEM_DELAY:
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+ p->serial_in = memdelay_serial_in;
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+ p->serial_out = memdelay_serial_out;
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+ break;
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+
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#if defined(CONFIG_MIPS_ALCHEMY) || defined(CONFIG_SERIAL_8250_RT288X)
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case UPIO_AU:
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p->serial_in = au_serial_in;
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@@ -491,6 +510,7 @@ serial_port_out_sync(struct uart_port *p
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switch (p->iotype) {
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case UPIO_MEM:
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case UPIO_MEM32:
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+ case UPIO_MEM_DELAY:
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case UPIO_AU:
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p->serial_out(p, offset, value);
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p->serial_in(p, UART_LCR); /* safe, no side-effects */
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@@ -2649,6 +2669,7 @@ static int serial8250_request_std_resour
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case UPIO_TSI:
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case UPIO_MEM32:
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case UPIO_MEM:
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+ case UPIO_MEM_DELAY:
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if (!port->mapbase)
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break;
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@@ -2685,6 +2706,7 @@ static void serial8250_release_std_resou
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case UPIO_TSI:
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case UPIO_MEM32:
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case UPIO_MEM:
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+ case UPIO_MEM_DELAY:
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if (!port->mapbase)
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break;
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@@ -3418,6 +3440,7 @@ static int serial8250_probe(struct platf
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uart.port.set_termios = p->set_termios;
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uart.port.pm = p->pm;
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uart.port.dev = &dev->dev;
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+ uart.port.rw_delay = p->rw_delay;
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uart.port.irqflags |= irqflag;
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ret = serial8250_register_8250_port(&uart);
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if (ret < 0) {
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@@ -3574,6 +3597,7 @@ int serial8250_register_8250_port(struct
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uart->port.flags = up->port.flags | UPF_BOOT_AUTOCONF;
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uart->bugs = up->bugs;
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uart->port.mapbase = up->port.mapbase;
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+ uart->port.rw_delay = up->port.rw_delay;
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uart->port.private_data = up->port.private_data;
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uart->port.fifosize = up->port.fifosize;
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uart->tx_loadsz = up->tx_loadsz;
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--- a/drivers/tty/serial/serial_core.c
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+++ b/drivers/tty/serial/serial_core.c
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@@ -2090,6 +2090,7 @@ uart_report_port(struct uart_driver *drv
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snprintf(address, sizeof(address),
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"I/O 0x%lx offset 0x%x", port->iobase, port->hub6);
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break;
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+ case UPIO_MEM_DELAY:
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case UPIO_MEM:
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case UPIO_MEM32:
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case UPIO_AU:
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@@ -2736,6 +2737,7 @@ int uart_match_port(struct uart_port *po
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case UPIO_HUB6:
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return (port1->iobase == port2->iobase) &&
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(port1->hub6 == port2->hub6);
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+ case UPIO_MEM_DELAY:
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case UPIO_MEM:
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case UPIO_MEM32:
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case UPIO_AU:
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--- a/include/linux/serial_8250.h
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+++ b/include/linux/serial_8250.h
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@@ -27,6 +27,7 @@ struct plat_serial8250_port {
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void *private_data;
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unsigned char regshift; /* register shift */
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unsigned char iotype; /* UPIO_* */
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+ unsigned int rw_delay; /* udelay for slower busses IXP4XX Expansion Bus */
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unsigned char hub6;
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upf_t flags; /* UPF_* flags */
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unsigned int type; /* If UPF_FIXED_TYPE */
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--- a/include/linux/serial_core.h
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+++ b/include/linux/serial_core.h
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@@ -146,6 +146,7 @@ struct uart_port {
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#define UPIO_MEM32 (3)
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#define UPIO_AU (4) /* Au1x00 and RT288x type IO */
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#define UPIO_TSI (5) /* Tsi108/109 type IO */
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+#define UPIO_MEM_DELAY (6)
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unsigned int read_status_mask; /* driver specific */
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unsigned int ignore_status_mask; /* driver specific */
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@@ -202,6 +203,7 @@ struct uart_port {
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int hw_stopped; /* sw-assisted CTS flow state */
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unsigned int mctrl; /* current modem ctrl settings */
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unsigned int timeout; /* character-based timeout */
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+ unsigned int rw_delay; /* udelay for slow busses, IXP4XX Expansion Bus */
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unsigned int type; /* port type */
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const struct uart_ops *ops;
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unsigned int custom_divisor;
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