1 files changed, 111 insertions, 12 deletions

diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 90621c3312bc..c9832d963f1e 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -251,9 +251,16 @@ static const struct serial8250_config uart_config[] = {
                 .fcr            = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
                 .flags          = UART_CAP_FIFO | UART_CAP_UUE,
         },
+        [PORT_RM9000] = {
+                .name           = "RM9000",
+                .fifo_size      = 16,
+                .tx_loadsz      = 16,
+                .fcr            = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
+                .flags          = UART_CAP_FIFO,
+        },
 };
 
-#ifdef CONFIG_SERIAL_8250_AU1X00
+#if defined (CONFIG_SERIAL_8250_AU1X00)
 
 /* Au1x00 UART hardware has a weird register layout */
 static const u8 au_io_in_map[] = {
@@ -289,6 +296,44 @@ static inline int map_8250_out_reg(struct uart_8250_port *up, int offset)
         return au_io_out_map[offset];
 }
 
+#elif defined (CONFIG_SERIAL_8250_RM9K)
+
+static const u8
+        regmap_in[8] = {
+                [UART_RX]       = 0x00,
+                [UART_IER]      = 0x0c,
+                [UART_IIR]      = 0x14,
+                [UART_LCR]      = 0x1c,
+                [UART_MCR]      = 0x20,
+                [UART_LSR]      = 0x24,
+                [UART_MSR]      = 0x28,
+                [UART_SCR]      = 0x2c
+        },
+        regmap_out[8] = {
+                [UART_TX]       = 0x04,
+                [UART_IER]      = 0x0c,
+                [UART_FCR]      = 0x18,
+                [UART_LCR]      = 0x1c,
+                [UART_MCR]      = 0x20,
+                [UART_LSR]      = 0x24,
+                [UART_MSR]      = 0x28,
+                [UART_SCR]      = 0x2c
+        };
+
+static inline int map_8250_in_reg(struct uart_8250_port *up, int offset)
+{
+        if (up->port.iotype != UPIO_RM9000)
+                return offset;
+        return regmap_in[offset];
+}
+
+static inline int map_8250_out_reg(struct uart_8250_port *up, int offset)
+{
+        if (up->port.iotype != UPIO_RM9000)
+                return offset;
+        return regmap_out[offset];
+}
+
 #else
 
 /* sane hardware needs no mapping */
@@ -308,8 +353,10 @@ static unsigned int serial_in(struct uart_8250_port *up, int offset)
                 return inb(up->port.iobase + 1);
 
         case UPIO_MEM:
+        case UPIO_DWAPB:
                 return readb(up->port.membase + offset);
 
+        case UPIO_RM9000:
         case UPIO_MEM32:
                 return readl(up->port.membase + offset);
 
@@ -333,6 +380,8 @@ static unsigned int serial_in(struct uart_8250_port *up, int offset)
 static void
 serial_out(struct uart_8250_port *up, int offset, int value)
 {
+        /* Save the offset before it's remapped */
+        int save_offset = offset;
         offset = map_8250_out_reg(up, offset) << up->port.regshift;
 
         switch (up->port.iotype) {
@@ -345,6 +394,7 @@ serial_out(struct uart_8250_port *up, int offset, int value)
                 writeb(value, up->port.membase + offset);
                 break;
 
+        case UPIO_RM9000:
         case UPIO_MEM32:
                 writel(value, up->port.membase + offset);
                 break;
@@ -359,6 +409,18 @@ serial_out(struct uart_8250_port *up, int offset, int value)
                         writeb(value, up->port.membase + offset);
                 break;
 
+        case UPIO_DWAPB:
+                /* Save the LCR value so it can be re-written when a
+                 * Busy Detect interrupt occurs. */
+                if (save_offset == UART_LCR)
+                        up->lcr = value;
+                writeb(value, up->port.membase + offset);
+                /* Read the IER to ensure any interrupt is cleared before
+                 * returning from ISR. */
+                if (save_offset == UART_TX || save_offset == UART_IER)
+                        value = serial_in(up, UART_IER);
+                break;
+
         default:
                 outb(value, up->port.iobase + offset);
         }
@@ -373,6 +435,7 @@ serial_out_sync(struct uart_8250_port *up, int offset, int value)
 #ifdef CONFIG_SERIAL_8250_AU1X00
         case UPIO_AU:
 #endif
+        case UPIO_DWAPB:
                 serial_out(up, offset, value);
                 serial_in(up, UART_LCR);        /* safe, no side-effects */
                 break;
@@ -403,7 +466,7 @@ static inline void _serial_dl_write(struct uart_8250_port *up, int value)
         serial_outp(up, UART_DLM, value >> 8 & 0xff);
 }
 
-#ifdef CONFIG_SERIAL_8250_AU1X00
+#if defined (CONFIG_SERIAL_8250_AU1X00)
 /* Au1x00 haven't got a standard divisor latch */
 static int serial_dl_read(struct uart_8250_port *up)
 {
@@ -420,6 +483,24 @@ static void serial_dl_write(struct uart_8250_port *up, int value)
         else
                 _serial_dl_write(up, value);
 }
+#elif defined (CONFIG_SERIAL_8250_RM9K)
+static int serial_dl_read(struct uart_8250_port *up)
+{
+        return  (up->port.iotype == UPIO_RM9000) ?
+                (((__raw_readl(up->port.membase + 0x10) << 8) |
+                (__raw_readl(up->port.membase + 0x08) & 0xff)) & 0xffff) :
+                _serial_dl_read(up);
+}
+
+static void serial_dl_write(struct uart_8250_port *up, int value)
+{
+        if (up->port.iotype == UPIO_RM9000) {
+                __raw_writel(value, up->port.membase + 0x08);
+                __raw_writel(value >> 8, up->port.membase + 0x10);
+        } else {
+                _serial_dl_write(up, value);
+        }
+}
 #else
 #define serial_dl_read(up) _serial_dl_read(up)
 #define serial_dl_write(up, value) _serial_dl_write(up, value)
@@ -621,7 +702,7 @@ static unsigned int autoconfig_read_divisor_id(struct uart_8250_port *p)
  * its clones.  (We treat the broken original StarTech 16650 V1 as a
  * 16550, and why not?  Startech doesn't seem to even acknowledge its
  * existence.)
- * 
+ *
  * What evil have men's minds wrought...
  */
 static void autoconfig_has_efr(struct uart_8250_port *up)
@@ -674,7 +755,7 @@ static void autoconfig_has_efr(struct uart_8250_port *up)
                         up->bugs |= UART_BUG_QUOT;
                 return;
         }
-        
+
         /*
          * We check for a XR16C850 by setting DLL and DLM to 0, and then
          * reading back DLL and DLM.  The chip type depends on the DLM
@@ -817,7 +898,7 @@ static void autoconfig_16550a(struct uart_8250_port *up)
                         status1 &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */
                         status1 |= 0x10;  /* 1.625 divisor for baud_base --> 921600 */
                         serial_outp(up, 0x04, status1);
-                        
+
                         serial_dl_write(up, quot);
 
                         serial_outp(up, UART_LCR, 0);
@@ -922,7 +1003,7 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
                 /*
                  * Do a simple existence test first; if we fail this,
                  * there's no point trying anything else.
-                 * 
+                 *
                  * 0x80 is used as a nonsense port to prevent against
                  * false positives due to ISA bus float.  The
                  * assumption is that 0x80 is a non-existent port;
@@ -961,7 +1042,7 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
         save_mcr = serial_in(up, UART_MCR);
         save_lcr = serial_in(up, UART_LCR);
 
-        /* 
+        /*
          * Check to see if a UART is really there.  Certain broken
          * internal modems based on the Rockwell chipset fail this
          * test, because they apparently don't implement the loopback
@@ -1068,7 +1149,7 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
         else
                 serial_outp(up, UART_IER, 0);
 
- out:   
+ out:
         spin_unlock_irqrestore(&up->port.lock, flags);
 //      restore_flags(flags);
         DEBUG_AUTOCONF("type=%s\n", uart_config[up->port.type].name);
@@ -1094,7 +1175,7 @@ static void autoconfig_irq(struct uart_8250_port *up)
         save_mcr = serial_inp(up, UART_MCR);
         save_ier = serial_inp(up, UART_IER);
         serial_outp(up, UART_MCR, UART_MCR_OUT1 | UART_MCR_OUT2);
-        
+
         irqs = probe_irq_on();
         serial_outp(up, UART_MCR, 0);
         udelay (10);
@@ -1159,8 +1240,11 @@ static void serial8250_start_tx(struct uart_port *port)
                 if (up->bugs & UART_BUG_TXEN) {
                         unsigned char lsr, iir;
                         lsr = serial_in(up, UART_LSR);
-                        iir = serial_in(up, UART_IIR);
-                        if (lsr & UART_LSR_TEMT && iir & UART_IIR_NO_INT)
+                        iir = serial_in(up, UART_IIR) & 0x0f;
+                        if ((up->port.type == PORT_RM9000) ?
+                                (lsr & UART_LSR_THRE &&
+                                (iir == UART_IIR_NO_INT || iir == UART_IIR_THRI)) :
+                                (lsr & UART_LSR_TEMT && iir & UART_IIR_NO_INT))
                                 transmit_chars(up);
                 }
         }
@@ -1389,6 +1473,19 @@ static irqreturn_t serial8250_interrupt(int irq, void *dev_id)
                         handled = 1;
 
                         end = NULL;
+                } else if (up->port.iotype == UPIO_DWAPB &&
+                          (iir & UART_IIR_BUSY) == UART_IIR_BUSY) {
+                        /* The DesignWare APB UART has an Busy Detect (0x07)
+                         * interrupt meaning an LCR write attempt occured while the
+                         * UART was busy. The interrupt must be cleared by reading
+                         * the UART status register (USR) and the LCR re-written. */
+                        unsigned int status;
+                        status = *(volatile u32 *)up->port.private_data;
+                        serial_out(up, UART_LCR, up->lcr);
+
+                        handled = 1;
+
+                        end = NULL;
                 } else if (end == NULL)
                         end = l;
 
@@ -1928,7 +2025,7 @@ serial8250_set_termios(struct uart_port *port, struct ktermios *termios,
         /*
          * Ask the core to calculate the divisor for us.
          */
-        baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); 
+        baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
         quot = serial8250_get_divisor(port, baud);
 
         /*
@@ -2090,6 +2187,7 @@ static int serial8250_request_std_resource(struct uart_8250_port *up)
         case UPIO_TSI:
         case UPIO_MEM32:
         case UPIO_MEM:
+        case UPIO_DWAPB:
                 if (!up->port.mapbase)
                         break;
 
@@ -2127,6 +2225,7 @@ static void serial8250_release_std_resource(struct uart_8250_port *up)
         case UPIO_TSI:
         case UPIO_MEM32:
         case UPIO_MEM:
+        case UPIO_DWAPB:
                 if (!up->port.mapbase)
                         break;