1 files changed, 278 insertions, 0 deletions

diff --git a/include/asm-v850/v850e_uarta.h b/include/asm-v850/v850e_uarta.h
new file mode 100644
index 000000000000..e483e0950725
--- /dev/null
+++ b/include/asm-v850/v850e_uarta.h
@@ -0,0 +1,278 @@
+/*
+ * include/asm-v850/v850e_uarta.h -- original V850E on-chip UART
+ *
+ *  Copyright (C) 2001,02,03  NEC Electronics Corporation
+ *  Copyright (C) 2001,02,03  Miles Bader <miles@gnu.org>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License.  See the file COPYING in the main directory of this
+ * archive for more details.
+ *
+ * Written by Miles Bader <miles@gnu.org>
+ */
+
+/* This is the original V850E UART implementation is called just `UART' in
+   the docs, but we name this header file <asm/v850e_uarta.h> because the
+   name <asm/v850e_uart.h> is used for the common driver that handles both
+   `UART' and `UARTB' implementations.  */
+
+#ifndef __V850_V850E_UARTA_H__
+#define __V850_V850E_UARTA_H__
+
+
+/* Raw hardware interface.  */
+
+/* The base address of the UART control registers for channel N.
+   The default is the address used on the V850E/MA1.  */
+#ifndef V850E_UART_BASE_ADDR
+#define V850E_UART_BASE_ADDR(n)         (0xFFFFFA00 + 0x10 * (n))
+#endif 
+
+/* Addresses of specific UART control registers for channel N.
+   The defaults are the addresses used on the V850E/MA1; if a platform
+   wants to redefine any of these, it must redefine them all.  */
+#ifndef V850E_UART_ASIM_ADDR
+#define V850E_UART_ASIM_ADDR(n)         (V850E_UART_BASE_ADDR(n) + 0x0)
+#define V850E_UART_RXB_ADDR(n)          (V850E_UART_BASE_ADDR(n) + 0x2)
+#define V850E_UART_ASIS_ADDR(n)         (V850E_UART_BASE_ADDR(n) + 0x3)
+#define V850E_UART_TXB_ADDR(n)          (V850E_UART_BASE_ADDR(n) + 0x4)
+#define V850E_UART_ASIF_ADDR(n)         (V850E_UART_BASE_ADDR(n) + 0x5)
+#define V850E_UART_CKSR_ADDR(n)         (V850E_UART_BASE_ADDR(n) + 0x6)
+#define V850E_UART_BRGC_ADDR(n)         (V850E_UART_BASE_ADDR(n) + 0x7)
+#endif
+
+/* UART config registers.  */
+#define V850E_UART_ASIM(n)      (*(volatile u8 *)V850E_UART_ASIM_ADDR(n))
+/* Control bits for config registers.  */
+#define V850E_UART_ASIM_CAE     0x80 /* clock enable */
+#define V850E_UART_ASIM_TXE     0x40 /* transmit enable */
+#define V850E_UART_ASIM_RXE     0x20 /* receive enable */
+#define V850E_UART_ASIM_PS_MASK 0x18 /* mask covering parity-select bits */
+#define V850E_UART_ASIM_PS_NONE 0x00 /* no parity */
+#define V850E_UART_ASIM_PS_ZERO 0x08 /* zero parity */
+#define V850E_UART_ASIM_PS_ODD  0x10 /* odd parity */
+#define V850E_UART_ASIM_PS_EVEN 0x18 /* even parity */
+#define V850E_UART_ASIM_CL_8    0x04 /* char len is 8 bits (otherwise, 7) */
+#define V850E_UART_ASIM_SL_2    0x02 /* 2 stop bits (otherwise, 1) */
+#define V850E_UART_ASIM_ISRM    0x01 /* generate INTSR interrupt on errors
+                                        (otherwise, generate INTSER) */
+
+/* UART serial interface status registers.  */
+#define V850E_UART_ASIS(n)      (*(volatile u8 *)V850E_UART_ASIS_ADDR(n))
+/* Control bits for status registers.  */
+#define V850E_UART_ASIS_PE      0x04 /* parity error */
+#define V850E_UART_ASIS_FE      0x02 /* framing error */
+#define V850E_UART_ASIS_OVE     0x01 /* overrun error */
+
+/* UART serial interface transmission status registers.  */
+#define V850E_UART_ASIF(n)      (*(volatile u8 *)V850E_UART_ASIF_ADDR(n))
+#define V850E_UART_ASIF_TXBF    0x02 /* transmit buffer flag (data in TXB) */
+#define V850E_UART_ASIF_TXSF    0x01 /* transmit shift flag (sending data) */
+
+/* UART receive buffer register.  */
+#define V850E_UART_RXB(n)       (*(volatile u8 *)V850E_UART_RXB_ADDR(n))
+
+/* UART transmit buffer register.  */
+#define V850E_UART_TXB(n)       (*(volatile u8 *)V850E_UART_TXB_ADDR(n))
+
+/* UART baud-rate generator control registers.  */
+#define V850E_UART_CKSR(n)      (*(volatile u8 *)V850E_UART_CKSR_ADDR(n))
+#define V850E_UART_CKSR_MAX     11
+#define V850E_UART_BRGC(n)      (*(volatile u8 *)V850E_UART_BRGC_ADDR(n))
+#define V850E_UART_BRGC_MIN     8
+
+
+#ifndef V850E_UART_CKSR_MAX_FREQ
+#define V850E_UART_CKSR_MAX_FREQ (25*1000*1000)
+#endif
+
+/* Calculate the minimum value for CKSR on this processor.  */
+static inline unsigned v850e_uart_cksr_min (void)
+{
+        int min = 0;
+        unsigned freq = V850E_UART_BASE_FREQ;
+        while (freq > V850E_UART_CKSR_MAX_FREQ) {
+                freq >>= 1;
+                min++;
+        }
+        return min;
+}
+
+
+/* Slightly abstract interface used by driver.  */
+
+
+/* Interrupts used by the UART.  */
+
+/* Received when the most recently transmitted character has been sent.  */
+#define V850E_UART_TX_IRQ(chan)         IRQ_INTST (chan)
+/* Received when a new character has been received.  */
+#define V850E_UART_RX_IRQ(chan)         IRQ_INTSR (chan)
+
+
+/* UART clock generator interface.  */
+
+/* This type encapsulates a particular uart frequency.  */
+typedef struct {
+        unsigned clk_divlog2;
+        unsigned brgen_count;
+} v850e_uart_speed_t;
+
+/* Calculate a uart speed from BAUD for this uart.  */
+static inline v850e_uart_speed_t v850e_uart_calc_speed (unsigned baud)
+{
+        v850e_uart_speed_t speed;
+
+        /* Calculate the log2 clock divider and baud-rate counter values
+           (note that the UART divides the resulting clock by 2, so
+           multiply BAUD by 2 here to compensate).  */
+        calc_counter_params (V850E_UART_BASE_FREQ, baud * 2,
+                             v850e_uart_cksr_min(),
+                             V850E_UART_CKSR_MAX, 8/*bits*/,
+                             &speed.clk_divlog2, &speed.brgen_count);
+
+        return speed;
+}
+
+/* Return the current speed of uart channel CHAN.  */
+static inline v850e_uart_speed_t v850e_uart_speed (unsigned chan)
+{
+        v850e_uart_speed_t speed;
+        speed.clk_divlog2 = V850E_UART_CKSR (chan);
+        speed.brgen_count = V850E_UART_BRGC (chan);
+        return speed;
+}
+
+/* Set the current speed of uart channel CHAN.  */
+static inline void v850e_uart_set_speed(unsigned chan,v850e_uart_speed_t speed)
+{
+        V850E_UART_CKSR (chan) = speed.clk_divlog2;
+        V850E_UART_BRGC (chan) = speed.brgen_count;
+}
+
+static inline int
+v850e_uart_speed_eq (v850e_uart_speed_t speed1, v850e_uart_speed_t speed2)
+{
+        return speed1.clk_divlog2 == speed2.clk_divlog2
+                && speed1.brgen_count == speed2.brgen_count;
+}
+
+/* Minimum baud rate possible.  */
+#define v850e_uart_min_baud() \
+   ((V850E_UART_BASE_FREQ >> V850E_UART_CKSR_MAX) / (2 * 255) + 1)
+
+/* Maximum baud rate possible.  The error is quite high at max, though.  */
+#define v850e_uart_max_baud() \
+   ((V850E_UART_BASE_FREQ >> v850e_uart_cksr_min()) / (2 *V850E_UART_BRGC_MIN))
+
+/* The `maximum' clock rate the uart can used, which is wanted (though not
+   really used in any useful way) by the serial framework.  */
+#define v850e_uart_max_clock() \
+   ((V850E_UART_BASE_FREQ >> v850e_uart_cksr_min()) / 2)
+
+
+/* UART configuration interface.  */
+
+/* Type of the uart config register; must be a scalar.  */
+typedef u16 v850e_uart_config_t;
+
+/* The uart hardware config register for channel CHAN.  */
+#define V850E_UART_CONFIG(chan)         V850E_UART_ASIM (chan)
+
+/* This config bit set if the uart is enabled.  */
+#define V850E_UART_CONFIG_ENABLED       V850E_UART_ASIM_CAE
+/* If the uart _isn't_ enabled, store this value to it to do so.  */
+#define V850E_UART_CONFIG_INIT          V850E_UART_ASIM_CAE
+/* Store this config value to disable the uart channel completely.  */
+#define V850E_UART_CONFIG_FINI          0
+
+/* Setting/clearing these bits enable/disable TX/RX, respectively (but
+   otherwise generally leave things running).  */
+#define V850E_UART_CONFIG_RX_ENABLE     V850E_UART_ASIM_RXE
+#define V850E_UART_CONFIG_TX_ENABLE     V850E_UART_ASIM_TXE
+
+/* These masks define which config bits affect TX/RX modes, respectively.  */
+#define V850E_UART_CONFIG_RX_BITS \
+  (V850E_UART_ASIM_PS_MASK | V850E_UART_ASIM_CL_8 | V850E_UART_ASIM_ISRM)
+#define V850E_UART_CONFIG_TX_BITS \
+  (V850E_UART_ASIM_PS_MASK | V850E_UART_ASIM_CL_8 | V850E_UART_ASIM_SL_2)
+
+static inline v850e_uart_config_t v850e_uart_calc_config (unsigned cflags)
+{
+        v850e_uart_config_t config = 0;
+
+        /* Figure out new configuration of control register.  */
+        if (cflags & CSTOPB)
+                /* Number of stop bits, 1 or 2.  */
+                config |= V850E_UART_ASIM_SL_2;
+        if ((cflags & CSIZE) == CS8)
+                /* Number of data bits, 7 or 8.  */
+                config |= V850E_UART_ASIM_CL_8;
+        if (! (cflags & PARENB))
+                /* No parity check/generation.  */
+                config |= V850E_UART_ASIM_PS_NONE;
+        else if (cflags & PARODD)
+                /* Odd parity check/generation.  */
+                config |= V850E_UART_ASIM_PS_ODD;
+        else
+                /* Even parity check/generation.  */
+                config |= V850E_UART_ASIM_PS_EVEN;
+        if (cflags & CREAD)
+                /* Reading enabled.  */
+                config |= V850E_UART_ASIM_RXE;
+
+        config |= V850E_UART_ASIM_CAE;
+        config |= V850E_UART_ASIM_TXE; /* Writing is always enabled.  */
+        config |= V850E_UART_ASIM_ISRM; /* Errors generate a read-irq.  */
+
+        return config;
+}
+
+/* This should delay as long as necessary for a recently written config
+   setting to settle, before we turn the uart back on.  */
+static inline void
+v850e_uart_config_delay (v850e_uart_config_t config, v850e_uart_speed_t speed)
+{
+        /* The UART may not be reset properly unless we wait at least 2
+           `basic-clocks' until turning on the TXE/RXE bits again.
+           A `basic clock' is the clock used by the baud-rate generator,
+           i.e., the cpu clock divided by the 2^new_clk_divlog2.
+           The loop takes 2 insns, so loop CYCLES / 2 times.  */
+        register unsigned count = 1 << speed.clk_divlog2;
+        while (--count != 0)
+                /* nothing */;
+}
+
+
+/* RX/TX interface.  */
+
+/* Return true if all characters awaiting transmission on uart channel N
+   have been transmitted.  */
+#define v850e_uart_xmit_done(n)                                               \
+   (! (V850E_UART_ASIF(n) & V850E_UART_ASIF_TXBF))
+/* Wait for this to be true.  */
+#define v850e_uart_wait_for_xmit_done(n)                                      \
+   do { } while (! v850e_uart_xmit_done (n))
+
+/* Return true if uart channel N is ready to transmit a character.  */
+#define v850e_uart_xmit_ok(n)                                                 \
+   (v850e_uart_xmit_done(n) && v850e_uart_cts(n))
+/* Wait for this to be true.  */
+#define v850e_uart_wait_for_xmit_ok(n)                                        \
+   do { } while (! v850e_uart_xmit_ok (n))
+
+/* Write character CH to uart channel CHAN.  */
+#define v850e_uart_putc(chan, ch)       (V850E_UART_TXB(chan) = (ch))
+
+/* Return latest character read on channel CHAN.  */
+#define v850e_uart_getc(chan)           V850E_UART_RXB (chan)
+
+/* Return bit-mask of uart error status.  */
+#define v850e_uart_err(chan)            V850E_UART_ASIS (chan)
+/* Various error bits set in the error result.  */
+#define V850E_UART_ERR_OVERRUN          V850E_UART_ASIS_OVE
+#define V850E_UART_ERR_FRAME            V850E_UART_ASIS_FE
+#define V850E_UART_ERR_PARITY           V850E_UART_ASIS_PE
+
+
+#endif /* __V850_V850E_UARTA_H__ */