blackfin architecture

This adds support for the Analog Devices Blackfin processor architecture, and
currently supports the BF533, BF532, BF531, BF537, BF536, BF534, and BF561
(Dual Core) devices, with a variety of development platforms including those
avaliable from Analog Devices (BF533-EZKit, BF533-STAMP, BF537-STAMP,
BF561-EZKIT), and Bluetechnix!  Tinyboards.

The Blackfin architecture was jointly developed by Intel and Analog Devices
Inc.  (ADI) as the Micro Signal Architecture (MSA) core and introduced it in
December of 2000.  Since then ADI has put this core into its Blackfin
processor family of devices.  The Blackfin core has the advantages of a clean,
orthogonal,RISC-like microprocessor instruction set.  It combines a dual-MAC
(Multiply/Accumulate), state-of-the-art signal processing engine and
single-instruction, multiple-data (SIMD) multimedia capabilities into a single
instruction-set architecture.

The Blackfin architecture, including the instruction set, is described by the
ADSP-BF53x/BF56x Blackfin Processor Programming Reference
http://blackfin.uclinux.org/gf/download/frsrelease/29/2549/Blackfin_PRM.pdf

The Blackfin processor is already supported by major releases of gcc, and
there are binary and source rpms/tarballs for many architectures at:
http://blackfin.uclinux.org/gf/project/toolchain/frs There is complete
documentation, including "getting started" guides available at:
http://docs.blackfin.uclinux.org/ which provides links to the sources and
patches you will need in order to set up a cross-compiling environment for
bfin-linux-uclibc

This patch, as well as the other patches (toolchain, distribution,
uClibc) are actively supported by Analog Devices Inc, at:
http://blackfin.uclinux.org/

We have tested this on LTP, and our test plan (including pass/fails) can
be found at:
http://docs.blackfin.uclinux.org/doku.php?id=testing_the_linux_kernel

[m.kozlowski@tuxland.pl: balance parenthesis in blackfin header files]
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Signed-off-by: Mariusz Kozlowski <m.kozlowski@tuxland.pl>
Signed-off-by: Aubrey Li <aubrey.li@analog.com>
Signed-off-by: Jie Zhang <jie.zhang@analog.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 147 insertions, 0 deletions

diff --git a/include/asm-blackfin/mach-bf537/bfin_serial_5xx.h b/include/asm-blackfin/mach-bf537/bfin_serial_5xx.h
new file mode 100644
index 000000000000..8f5d9c4d8d5b
--- /dev/null
+++ b/include/asm-blackfin/mach-bf537/bfin_serial_5xx.h
@@ -0,0 +1,147 @@
+#include <linux/serial.h>
+#include <asm/dma.h>
+
+#define NR_PORTS                2
+
+#define OFFSET_THR              0x00    /* Transmit Holding register            */
+#define OFFSET_RBR              0x00    /* Receive Buffer register              */
+#define OFFSET_DLL              0x00    /* Divisor Latch (Low-Byte)             */
+#define OFFSET_IER              0x04    /* Interrupt Enable Register            */
+#define OFFSET_DLH              0x04    /* Divisor Latch (High-Byte)            */
+#define OFFSET_IIR              0x08    /* Interrupt Identification Register    */
+#define OFFSET_LCR              0x0C    /* Line Control Register                */
+#define OFFSET_MCR              0x10    /* Modem Control Register               */
+#define OFFSET_LSR              0x14    /* Line Status Register                 */
+#define OFFSET_MSR              0x18    /* Modem Status Register                */
+#define OFFSET_SCR              0x1C    /* SCR Scratch Register                 */
+#define OFFSET_GCTL             0x24    /* Global Control Register              */
+
+#define UART_GET_CHAR(uart)     bfin_read16(((uart)->port.membase + OFFSET_RBR))
+#define UART_GET_DLL(uart)      bfin_read16(((uart)->port.membase + OFFSET_DLL))
+#define UART_GET_IER(uart)      bfin_read16(((uart)->port.membase + OFFSET_IER))
+#define UART_GET_DLH(uart)      bfin_read16(((uart)->port.membase + OFFSET_DLH))
+#define UART_GET_IIR(uart)      bfin_read16(((uart)->port.membase + OFFSET_IIR))
+#define UART_GET_LCR(uart)      bfin_read16(((uart)->port.membase + OFFSET_LCR))
+#define UART_GET_LSR(uart)      bfin_read16(((uart)->port.membase + OFFSET_LSR))
+#define UART_GET_GCTL(uart)     bfin_read16(((uart)->port.membase + OFFSET_GCTL))
+
+#define UART_PUT_CHAR(uart,v)   bfin_write16(((uart)->port.membase + OFFSET_THR),v)
+#define UART_PUT_DLL(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_DLL),v)
+#define UART_PUT_IER(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_IER),v)
+#define UART_PUT_DLH(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_DLH),v)
+#define UART_PUT_LCR(uart,v)    bfin_write16(((uart)->port.membase + OFFSET_LCR),v)
+#define UART_PUT_GCTL(uart,v)   bfin_write16(((uart)->port.membase + OFFSET_GCTL),v)
+
+#if defined(CONFIG_BFIN_UART0_CTSRTS) || defined(CONFIG_BFIN_UART1_CTSRTS)
+# define CONFIG_SERIAL_BFIN_CTSRTS
+
+# ifndef CONFIG_UART0_CTS_PIN
+#  define CONFIG_UART0_CTS_PIN -1
+# endif
+
+# ifndef CONFIG_UART0_RTS_PIN
+#  define CONFIG_UART0_RTS_PIN -1
+# endif
+
+# ifndef CONFIG_UART1_CTS_PIN
+#  define CONFIG_UART1_CTS_PIN -1
+# endif
+
+# ifndef CONFIG_UART1_RTS_PIN
+#  define CONFIG_UART1_RTS_PIN -1
+# endif
+#endif
+/*
+ * The pin configuration is different from schematic
+ */
+struct bfin_serial_port {
+        struct uart_port        port;
+        unsigned int            old_status;
+#ifdef CONFIG_SERIAL_BFIN_DMA
+        int                     tx_done;
+        int                     tx_count;
+        struct circ_buf         rx_dma_buf;
+        struct timer_list       rx_dma_timer;
+        int                     rx_dma_nrows;
+        unsigned int            tx_dma_channel;
+        unsigned int            rx_dma_channel;
+        struct work_struct      tx_dma_workqueue;
+#else
+        struct work_struct      cts_workqueue;
+#endif
+#ifdef CONFIG_SERIAL_BFIN_CTSRTS
+        int             cts_pin;
+        int             rts_pin;
+#endif
+};
+
+struct bfin_serial_port bfin_serial_ports[NR_PORTS];
+struct bfin_serial_res {
+        unsigned long   uart_base_addr;
+        int             uart_irq;
+#ifdef CONFIG_SERIAL_BFIN_DMA
+        unsigned int    uart_tx_dma_channel;
+        unsigned int    uart_rx_dma_channel;
+#endif
+#ifdef CONFIG_SERIAL_BFIN_CTSRTS
+        int     uart_cts_pin;
+        int     uart_rts_pin;
+#endif
+};
+
+struct bfin_serial_res bfin_serial_resource[] = {
+#ifdef CONFIG_SERIAL_BFIN_UART0
+        {
+        0xFFC00400,
+        IRQ_UART0_RX,
+#ifdef CONFIG_SERIAL_BFIN_DMA
+        CH_UART0_TX,
+        CH_UART0_RX,
+#endif
+#ifdef CONFIG_BFIN_UART0_CTSRTS
+        CONFIG_UART0_CTS_PIN,
+        CONFIG_UART0_RTS_PIN,
+#endif
+        },
+#endif
+#ifdef CONFIG_SERIAL_BFIN_UART1
+        {
+        0xFFC02000,
+        IRQ_UART1_RX,
+#ifdef CONFIG_SERIAL_BFIN_DMA
+        CH_UART1_TX,
+        CH_UART1_RX,
+#endif
+#ifdef CONFIG_BFIN_UART1_CTSRTS
+        CONFIG_UART1_CTS_PIN,
+        CONFIG_UART1_RTS_PIN,
+#endif
+        },
+#endif
+};
+
+int nr_ports = ARRAY_SIZE(bfin_serial_resource);
+
+static void bfin_serial_hw_init(struct bfin_serial_port *uart)
+{
+        unsigned short val;
+        val = bfin_read16(BFIN_PORT_MUX);
+        val &= ~(PFDE | PFTE);
+        bfin_write16(BFIN_PORT_MUX, val);
+
+        val = bfin_read16(PORTF_FER);
+        val |= 0xF;
+        bfin_write16(PORTF_FER, val);
+
+#ifdef CONFIG_SERIAL_BFIN_CTSRTS
+        if (uart->cts_pin >= 0) {
+                gpio_request(uart->cts_pin, NULL);
+                gpio_direction_input(uart->cts_pin);
+        }
+
+        if (uart->rts_pin >= 0) {
+                gpio_request(uart->rts_pin, NULL);
+                gpio_direction_output(uart->rts_pin);
+        }
+#endif
+}