diff options
Diffstat (limited to 'target/linux/ixp4xx/patches-4.9/160-delayed_uart_io.patch')
| -rw-r--r-- | target/linux/ixp4xx/patches-4.9/160-delayed_uart_io.patch | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/target/linux/ixp4xx/patches-4.9/160-delayed_uart_io.patch b/target/linux/ixp4xx/patches-4.9/160-delayed_uart_io.patch new file mode 100644 index 0000000000..c64596ae98 --- /dev/null +++ b/target/linux/ixp4xx/patches-4.9/160-delayed_uart_io.patch @@ -0,0 +1,133 @@ +--- a/drivers/tty/serial/8250/8250_core.c ++++ b/drivers/tty/serial/8250/8250_core.c +@@ -833,6 +833,7 @@ static int serial8250_probe(struct platf + uart.port.get_mctrl = p->get_mctrl; + uart.port.pm = p->pm; + uart.port.dev = &dev->dev; ++ uart.port.rw_delay = p->rw_delay; + uart.port.irqflags |= irqflag; + ret = serial8250_register_8250_port(&uart); + if (ret < 0) { +@@ -989,6 +990,7 @@ int serial8250_register_8250_port(struct + uart->bugs = up->bugs; + uart->port.mapbase = up->port.mapbase; + uart->port.mapsize = up->port.mapsize; ++ uart->port.rw_delay = up->port.rw_delay; + uart->port.private_data = up->port.private_data; + uart->tx_loadsz = up->tx_loadsz; + uart->capabilities = up->capabilities; +--- a/drivers/tty/serial/serial_core.c ++++ b/drivers/tty/serial/serial_core.c +@@ -2229,6 +2229,7 @@ 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_MEM16: + case UPIO_MEM32: +@@ -2893,6 +2894,7 @@ 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_MEM16: + case UPIO_MEM32: +--- a/include/linux/serial_8250.h ++++ b/include/linux/serial_8250.h +@@ -28,6 +28,7 @@ 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 +@@ -152,6 +152,7 @@ struct uart_port { + #define UPIO_TSI (SERIAL_IO_TSI) /* Tsi108/109 type IO */ + #define UPIO_MEM32BE (SERIAL_IO_MEM32BE) /* 32b big endian */ + #define UPIO_MEM16 (SERIAL_IO_MEM16) /* 16b little endian */ ++#define UPIO_MEM_DELAY (SERIAL_IO_MEM_DELAY) + + unsigned int read_status_mask; /* driver specific */ + unsigned int ignore_status_mask; /* driver specific */ +@@ -233,6 +234,7 @@ struct uart_port { + int hw_stopped; /* sw-assisted CTS flow state */ + 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_port.c ++++ b/drivers/tty/serial/8250/8250_port.c +@@ -384,6 +384,20 @@ static unsigned int mem16_serial_in(stru + return readw(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 = offset << p->regshift; +@@ -456,6 +470,11 @@ static void set_io_from_upio(struct uart + p->serial_out = mem32be_serial_out; + break; + ++ case UPIO_MEM_DELAY: ++ p->serial_in = memdelay_serial_in; ++ p->serial_out = memdelay_serial_out; ++ break; ++ + #ifdef CONFIG_SERIAL_8250_RT288X + case UPIO_AU: + p->serial_in = au_serial_in; +@@ -483,6 +502,7 @@ serial_port_out_sync(struct uart_port *p + case UPIO_MEM16: + case UPIO_MEM32: + case UPIO_MEM32BE: ++ case UPIO_MEM_DELAY: + case UPIO_AU: + p->serial_out(p, offset, value); + p->serial_in(p, UART_LCR); /* safe, no side-effects */ +@@ -2756,6 +2776,7 @@ static int serial8250_request_std_resour + case UPIO_MEM32BE: + case UPIO_MEM16: + case UPIO_MEM: ++ case UPIO_MEM_DELAY: + if (!port->mapbase) + break; + +@@ -2794,6 +2815,7 @@ static void serial8250_release_std_resou + case UPIO_MEM32BE: + case UPIO_MEM16: + case UPIO_MEM: ++ case UPIO_MEM_DELAY: + if (!port->mapbase) + break; + +--- a/include/uapi/linux/serial.h ++++ b/include/uapi/linux/serial.h +@@ -70,6 +70,7 @@ struct serial_struct { + #define SERIAL_IO_TSI 5 + #define SERIAL_IO_MEM32BE 6 + #define SERIAL_IO_MEM16 7 ++#define SERIAL_IO_MEM_DELAY 10 + + #define UART_CLEAR_FIFO 0x01 + #define UART_USE_FIFO 0x02 |