diff options
Diffstat (limited to 'target/linux/ixp4xx/patches-3.3/160-delayed_uart_io.patch')
| -rw-r--r-- | target/linux/ixp4xx/patches-3.3/160-delayed_uart_io.patch | 122 |
1 files changed, 122 insertions, 0 deletions
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 index 000000000..a3b1f25e5 --- /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: |