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123 lines
4.0 KiB
Diff
123 lines
4.0 KiB
Diff
Add a new UART I/O type for slow busses such as the ixp4xx expansion bus
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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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@@ -324,6 +324,7 @@ struct uart_port {
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#define UPIO_AU (4) /* Au1x00 type IO */
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#define UPIO_TSI (5) /* Tsi108/109 type IO */
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#define UPIO_RM9000 (6) /* RM9000 type IO */
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+#define UPIO_MEM_DELAY (7)
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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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@@ -368,6 +369,7 @@ struct uart_port {
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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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--- a/drivers/tty/serial/8250/8250.c
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+++ b/drivers/tty/serial/8250/8250.c
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@@ -400,6 +400,20 @@ 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 = map_8250_out_reg(p, offset) << p->regshift;
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@@ -459,6 +473,11 @@ 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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case UPIO_AU:
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p->serial_in = au_serial_in;
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p->serial_out = au_serial_out;
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@@ -481,6 +500,7 @@ serial_out_sync(struct uart_8250_port *u
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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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@@ -2498,6 +2518,7 @@ 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 (!up->port.mapbase)
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break;
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@@ -2534,6 +2555,7 @@ 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 (!up->port.mapbase)
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break;
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@@ -3050,6 +3072,7 @@ static int __devinit serial8250_probe(st
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port.set_termios = p->set_termios;
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port.pm = p->pm;
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port.dev = &dev->dev;
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+ port.rw_delay = p->rw_delay;
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port.irqflags |= irqflag;
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ret = serial8250_register_port(&port);
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if (ret < 0) {
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@@ -3199,6 +3222,7 @@ int serial8250_register_port(struct uart
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uart->port.iotype = port->iotype;
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uart->port.flags = port->flags | UPF_BOOT_AUTOCONF;
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uart->port.mapbase = port->mapbase;
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+ uart->port.rw_delay = port->rw_delay;
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uart->port.private_data = port->private_data;
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if (port->dev)
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uart->port.dev = port->dev;
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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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@@ -2021,6 +2021,7 @@ 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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@@ -2436,6 +2437,7 @@ 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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