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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-v850/v850e_uartb.h
downloadop-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip
op-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'include/asm-v850/v850e_uartb.h')
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diff --git a/include/asm-v850/v850e_uartb.h b/include/asm-v850/v850e_uartb.h
new file mode 100644
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+++ b/include/asm-v850/v850e_uartb.h
@@ -0,0 +1,262 @@
+/*
+ * include/asm-v850/v850e_uartb.h -- V850E on-chip `UARTB' 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>
+ */
+
+/* The V850E UARTB is basically a superset of the original V850E UART, but
+ even where it's the same, the names and details have changed a bit.
+ It's similar enough to use the same driver (v850e_uart.c), but the
+ details have been abstracted slightly to do so. */
+
+#ifndef __V850_V850E_UARTB_H__
+#define __V850_V850E_UARTB_H__
+
+
+/* Raw hardware interface. */
+
+#define V850E_UARTB_BASE_ADDR(n) (0xFFFFFA00 + 0x10 * (n))
+
+/* Addresses of specific UART control registers for channel N. */
+#define V850E_UARTB_CTL0_ADDR(n) (V850E_UARTB_BASE_ADDR(n) + 0x0)
+#define V850E_UARTB_CTL2_ADDR(n) (V850E_UARTB_BASE_ADDR(n) + 0x2)
+#define V850E_UARTB_STR_ADDR(n) (V850E_UARTB_BASE_ADDR(n) + 0x4)
+#define V850E_UARTB_RX_ADDR(n) (V850E_UARTB_BASE_ADDR(n) + 0x6)
+#define V850E_UARTB_RXAP_ADDR(n) (V850E_UARTB_BASE_ADDR(n) + 0x6)
+#define V850E_UARTB_TX_ADDR(n) (V850E_UARTB_BASE_ADDR(n) + 0x8)
+#define V850E_UARTB_FIC0_ADDR(n) (V850E_UARTB_BASE_ADDR(n) + 0xA)
+#define V850E_UARTB_FIC1_ADDR(n) (V850E_UARTB_BASE_ADDR(n) + 0xB)
+#define V850E_UARTB_FIC2_ADDR(n) (V850E_UARTB_BASE_ADDR(n) + 0xC)
+#define V850E_UARTB_FIS0_ADDR(n) (V850E_UARTB_BASE_ADDR(n) + 0xE)
+#define V850E_UARTB_FIS1_ADDR(n) (V850E_UARTB_BASE_ADDR(n) + 0xF)
+
+/* UARTB control register 0 (general config). */
+#define V850E_UARTB_CTL0(n) (*(volatile u8 *)V850E_UARTB_CTL0_ADDR(n))
+/* Control bits for config registers. */
+#define V850E_UARTB_CTL0_PWR 0x80 /* clock enable */
+#define V850E_UARTB_CTL0_TXE 0x40 /* transmit enable */
+#define V850E_UARTB_CTL0_RXE 0x20 /* receive enable */
+#define V850E_UARTB_CTL0_DIR 0x10 /* */
+#define V850E_UARTB_CTL0_PS1 0x08 /* parity */
+#define V850E_UARTB_CTL0_PS0 0x04 /* parity */
+#define V850E_UARTB_CTL0_CL 0x02 /* char len 1:8bit, 0:7bit */
+#define V850E_UARTB_CTL0_SL 0x01 /* stop bit 1:2bit, 0:1bit */
+#define V850E_UARTB_CTL0_PS_MASK 0x0C /* mask covering parity bits */
+#define V850E_UARTB_CTL0_PS_NONE 0x00 /* no parity */
+#define V850E_UARTB_CTL0_PS_ZERO 0x04 /* zero parity */
+#define V850E_UARTB_CTL0_PS_ODD 0x08 /* odd parity */
+#define V850E_UARTB_CTL0_PS_EVEN 0x0C /* even parity */
+#define V850E_UARTB_CTL0_CL_8 0x02 /* char len 1:8bit, 0:7bit */
+#define V850E_UARTB_CTL0_SL_2 0x01 /* stop bit 1:2bit, 0:1bit */
+
+/* UARTB control register 2 (clock divider). */
+#define V850E_UARTB_CTL2(n) (*(volatile u16 *)V850E_UARTB_CTL2_ADDR(n))
+#define V850E_UARTB_CTL2_MIN 4
+#define V850E_UARTB_CTL2_MAX 0xFFFF
+
+/* UARTB serial interface status register. */
+#define V850E_UARTB_STR(n) (*(volatile u8 *)V850E_UARTB_STR_ADDR(n))
+/* Control bits for status registers. */
+#define V850E_UARTB_STR_TSF 0x80 /* UBTX or FIFO exist data */
+#define V850E_UARTB_STR_OVF 0x08 /* overflow error */
+#define V850E_UARTB_STR_PE 0x04 /* parity error */
+#define V850E_UARTB_STR_FE 0x02 /* framing error */
+#define V850E_UARTB_STR_OVE 0x01 /* overrun error */
+
+/* UARTB receive data register. */
+#define V850E_UARTB_RX(n) (*(volatile u8 *)V850E_UARTB_RX_ADDR(n))
+#define V850E_UARTB_RXAP(n) (*(volatile u16 *)V850E_UARTB_RXAP_ADDR(n))
+/* Control bits for status registers. */
+#define V850E_UARTB_RXAP_PEF 0x0200 /* parity error */
+#define V850E_UARTB_RXAP_FEF 0x0100 /* framing error */
+
+/* UARTB transmit data register. */
+#define V850E_UARTB_TX(n) (*(volatile u8 *)V850E_UARTB_TX_ADDR(n))
+
+/* UARTB FIFO control register 0. */
+#define V850E_UARTB_FIC0(n) (*(volatile u8 *)V850E_UARTB_FIC0_ADDR(n))
+
+/* UARTB FIFO control register 1. */
+#define V850E_UARTB_FIC1(n) (*(volatile u8 *)V850E_UARTB_FIC1_ADDR(n))
+
+/* UARTB FIFO control register 2. */
+#define V850E_UARTB_FIC2(n) (*(volatile u16 *)V850E_UARTB_FIC2_ADDR(n))
+
+/* UARTB FIFO status register 0. */
+#define V850E_UARTB_FIS0(n) (*(volatile u8 *)V850E_UARTB_FIS0_ADDR(n))
+
+/* UARTB FIFO status register 1. */
+#define V850E_UARTB_FIS1(n) (*(volatile u8 *)V850E_UARTB_FIS1_ADDR(n))
+
+
+/* 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_INTUBTIT (chan)
+/* Received when a new character has been received. */
+#define V850E_UART_RX_IRQ(chan) IRQ_INTUBTIR (chan)
+
+/* Use by serial driver for information purposes. */
+#define V850E_UART_BASE_ADDR(chan) V850E_UARTB_BASE_ADDR(chan)
+
+
+/* UART clock generator interface. */
+
+/* This type encapsulates a particular uart frequency. */
+typedef u16 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;
+
+ /*
+ * V850E/ME2 UARTB baud rate is determined by the value of UBCTL2
+ * fx = V850E_UARTB_BASE_FREQ = CPU_CLOCK_FREQ/4
+ * baud = fx / 2*speed [ speed >= 4 ]
+ */
+ speed = V850E_UARTB_CTL2_MIN;
+ while (((V850E_UARTB_BASE_FREQ / 2) / speed ) > baud)
+ speed++;
+
+ return speed;
+}
+
+/* Return the current speed of uart channel CHAN. */
+#define v850e_uart_speed(chan) V850E_UARTB_CTL2 (chan)
+
+/* Set the current speed of uart channel CHAN. */
+#define v850e_uart_set_speed(chan, speed) (V850E_UARTB_CTL2 (chan) = (speed))
+
+/* Return true if SPEED1 and SPEED2 are the same. */
+#define v850e_uart_speed_eq(speed1, speed2) ((speed1) == (speed2))
+
+/* Minimum baud rate possible. */
+#define v850e_uart_min_baud() \
+ ((V850E_UARTB_BASE_FREQ / 2) / V850E_UARTB_CTL2_MAX)
+
+/* Maximum baud rate possible. The error is quite high at max, though. */
+#define v850e_uart_max_baud() \
+ ((V850E_UARTB_BASE_FREQ / 2) / V850E_UARTB_CTL2_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_UARTB_BASE_FREQ / 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_UARTB_CTL0 (chan)
+
+/* This config bit set if the uart is enabled. */
+#define V850E_UART_CONFIG_ENABLED V850E_UARTB_CTL0_PWR
+/* If the uart _isn't_ enabled, store this value to it to do so. */
+#define V850E_UART_CONFIG_INIT V850E_UARTB_CTL0_PWR
+/* 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_UARTB_CTL0_RXE
+#define V850E_UART_CONFIG_TX_ENABLE V850E_UARTB_CTL0_TXE
+
+/* These masks define which config bits affect TX/RX modes, respectively. */
+#define V850E_UART_CONFIG_RX_BITS \
+ (V850E_UARTB_CTL0_PS_MASK | V850E_UARTB_CTL0_CL_8)
+#define V850E_UART_CONFIG_TX_BITS \
+ (V850E_UARTB_CTL0_PS_MASK | V850E_UARTB_CTL0_CL_8 | V850E_UARTB_CTL0_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_UARTB_CTL0_SL_2;
+ if ((cflags & CSIZE) == CS8)
+ /* Number of data bits, 7 or 8. */
+ config |= V850E_UARTB_CTL0_CL_8;
+ if (! (cflags & PARENB))
+ /* No parity check/generation. */
+ config |= V850E_UARTB_CTL0_PS_NONE;
+ else if (cflags & PARODD)
+ /* Odd parity check/generation. */
+ config |= V850E_UARTB_CTL0_PS_ODD;
+ else
+ /* Even parity check/generation. */
+ config |= V850E_UARTB_CTL0_PS_EVEN;
+ if (cflags & CREAD)
+ /* Reading enabled. */
+ config |= V850E_UARTB_CTL0_RXE;
+
+ config |= V850E_UARTB_CTL0_PWR;
+ config |= V850E_UARTB_CTL0_TXE; /* Writing is always enabled. */
+ config |= V850E_UARTB_CTL0_DIR; /* LSB first. */
+
+ 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;
+ 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_UARTB_STR(n) & V850E_UARTB_STR_TSF))
+/* 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_UARTB_TX(chan) = (ch))
+
+/* Return latest character read on channel CHAN. */
+#define v850e_uart_getc(chan) V850E_UARTB_RX (chan)
+
+/* Return bit-mask of uart error status. */
+#define v850e_uart_err(chan) V850E_UARTB_STR (chan)
+/* Various error bits set in the error result. */
+#define V850E_UART_ERR_OVERRUN V850E_UARTB_STR_OVE
+#define V850E_UART_ERR_FRAME V850E_UARTB_STR_FE
+#define V850E_UART_ERR_PARITY V850E_UARTB_STR_PE
+
+
+#endif /* __V850_V850E_UARTB_H__ */
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