ixp4xx: split out new UART I/O to its own patch

[openwrt.git] / target / linux / ixp4xx / patches-3.3 / 160-delayed_uart_io.patch

diff --git a/target/linux/ixp4xx/patches-3.3/160-delayed_uart_io.patch b/target/linux/ixp4xx/patches-3.3/160-delayed_uart_io.patch
new file mode 100644 (file)
index 0000000..a3b1f25
--- /dev/null
+++ b/target/linux/ixp4xx/patches-3.3/160-delayed_uart_io.patch
@@ -0,0 +1,122 @@
+Add a new UART I/O type for slow busses such as the ixp4xx expansion bus
+--- 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
+@@ -324,6 +324,7 @@ struct uart_port {
+ #define UPIO_AU                       (4)                     /* Au1x00 type IO */
+ #define UPIO_TSI              (5)                     /* Tsi108/109 type IO */
+ #define UPIO_RM9000           (6)                     /* RM9000 type IO */
++#define UPIO_MEM_DELAY                (7)
+ 
+       unsigned int            read_status_mask;       /* driver specific */
+       unsigned int            ignore_status_mask;     /* driver specific */
+@@ -368,6 +369,7 @@ struct uart_port {
+ 
+       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;
+--- a/drivers/tty/serial/8250/8250.c
++++ b/drivers/tty/serial/8250/8250.c
+@@ -400,6 +400,20 @@ 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 = map_8250_out_reg(p, offset) << p->regshift;
+@@ -459,6 +473,11 @@ 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;
++
+       case UPIO_AU:
+               p->serial_in = au_serial_in;
+               p->serial_out = au_serial_out;
+@@ -481,6 +500,7 @@ serial_out_sync(struct uart_8250_port *u
+       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 */
+@@ -2498,6 +2518,7 @@ static int serial8250_request_std_resour
+       case UPIO_TSI:
+       case UPIO_MEM32:
+       case UPIO_MEM:
++      case UPIO_MEM_DELAY:
+               if (!up->port.mapbase)
+                       break;
+ 
+@@ -2534,6 +2555,7 @@ static void serial8250_release_std_resou
+       case UPIO_TSI:
+       case UPIO_MEM32:
+       case UPIO_MEM:
++      case UPIO_MEM_DELAY:
+               if (!up->port.mapbase)
+                       break;
+ 
+@@ -3050,6 +3072,7 @@ static int __devinit serial8250_probe(st
+               port.set_termios        = p->set_termios;
+               port.pm                 = p->pm;
+               port.dev                = &dev->dev;
++              port.rw_delay           = p->rw_delay;
+               port.irqflags           |= irqflag;
+               ret = serial8250_register_port(&port);
+               if (ret < 0) {
+@@ -3199,6 +3222,7 @@ int serial8250_register_port(struct uart
+               uart->port.iotype       = port->iotype;
+               uart->port.flags        = port->flags | UPF_BOOT_AUTOCONF;
+               uart->port.mapbase      = port->mapbase;
++              uart->port.rw_delay                     = port->rw_delay;
+               uart->port.private_data = port->private_data;
+               if (port->dev)
+                       uart->port.dev = port->dev;
+--- a/drivers/tty/serial/serial_core.c
++++ b/drivers/tty/serial/serial_core.c
+@@ -2021,6 +2021,7 @@ 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:
+@@ -2435,6 +2436,7 @@ 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: