133 lines
4.4 KiB
Diff
133 lines
4.4 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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@@ -833,6 +833,7 @@ static int serial8250_probe(struct platf
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uart.port.get_mctrl = p->get_mctrl;
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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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@@ -989,6 +990,7 @@ int serial8250_register_8250_port(struct
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uart->bugs = up->bugs;
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uart->port.mapbase = up->port.mapbase;
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uart->port.mapsize = up->port.mapsize;
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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->tx_loadsz = up->tx_loadsz;
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uart->capabilities = up->capabilities;
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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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@@ -2229,6 +2229,7 @@ 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_MEM16:
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case UPIO_MEM32:
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@@ -2893,6 +2894,7 @@ 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_MEM16:
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case UPIO_MEM32:
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--- a/include/linux/serial_8250.h
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+++ b/include/linux/serial_8250.h
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@@ -28,6 +28,7 @@ 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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@@ -152,6 +152,7 @@ struct uart_port {
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#define UPIO_TSI (SERIAL_IO_TSI) /* Tsi108/109 type IO */
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#define UPIO_MEM32BE (SERIAL_IO_MEM32BE) /* 32b big endian */
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#define UPIO_MEM16 (SERIAL_IO_MEM16) /* 16b little endian */
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+#define UPIO_MEM_DELAY (SERIAL_IO_MEM_DELAY)
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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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@@ -233,6 +234,7 @@ 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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--- a/drivers/tty/serial/8250/8250_port.c
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+++ b/drivers/tty/serial/8250/8250_port.c
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@@ -384,6 +384,20 @@ static unsigned int mem16_serial_in(stru
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return readw(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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@@ -456,6 +470,11 @@ static void set_io_from_upio(struct uart
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p->serial_out = mem32be_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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#ifdef 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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@@ -483,6 +502,7 @@ serial_port_out_sync(struct uart_port *p
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case UPIO_MEM16:
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case UPIO_MEM32:
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case UPIO_MEM32BE:
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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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@@ -2759,6 +2779,7 @@ static int serial8250_request_std_resour
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case UPIO_MEM32BE:
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case UPIO_MEM16:
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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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@@ -2797,6 +2818,7 @@ static void serial8250_release_std_resou
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case UPIO_MEM32BE:
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case UPIO_MEM16:
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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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--- a/include/uapi/linux/serial.h
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+++ b/include/uapi/linux/serial.h
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@@ -70,6 +70,7 @@ struct serial_struct {
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#define SERIAL_IO_TSI 5
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#define SERIAL_IO_MEM32BE 6
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#define SERIAL_IO_MEM16 7
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+#define SERIAL_IO_MEM_DELAY 10
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#define UART_CLEAR_FIFO 0x01
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#define UART_USE_FIFO 0x02
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