UART: add CSR SiRFprimaII SoC on-chip uart drivers

SiRFprimaII is the latest generation application processor from CSR’s
multi-function SoC product family.
The SoC support codes are in arch/arm/mach-prima2 from Linux mainline
3.0.

There are three dedicated UARTs in system. This patch adds basic driver
support for them.

It has used the newest pinmux subsystem from Linus Walleij.

Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Rong Wang <Rong.Wang@csr.com>
Signed-off-by: Bin Shi <Bin.Shi@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 185 insertions, 0 deletions

diff --git a/drivers/tty/serial/sirfsoc_uart.h b/drivers/tty/serial/sirfsoc_uart.h
new file mode 100644
index 000000000000..fc64260fa93c
--- /dev/null
+++ b/drivers/tty/serial/sirfsoc_uart.h
@@ -0,0 +1,185 @@
+/*
+ * Drivers for CSR SiRFprimaII onboard UARTs.
+ *
+ * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
+ *
+ * Licensed under GPLv2 or later.
+ */
+#include <linux/bitops.h>
+
+/* UART Register Offset Define */
+#define SIRFUART_LINE_CTRL                      0x0040
+#define SIRFUART_TX_RX_EN                       0x004c
+#define SIRFUART_DIVISOR                        0x0050
+#define SIRFUART_INT_EN                         0x0054
+#define SIRFUART_INT_STATUS                     0x0058
+#define SIRFUART_TX_DMA_IO_CTRL                 0x0100
+#define SIRFUART_TX_DMA_IO_LEN                  0x0104
+#define SIRFUART_TX_FIFO_CTRL                   0x0108
+#define SIRFUART_TX_FIFO_LEVEL_CHK              0x010C
+#define SIRFUART_TX_FIFO_OP                     0x0110
+#define SIRFUART_TX_FIFO_STATUS                 0x0114
+#define SIRFUART_TX_FIFO_DATA                   0x0118
+#define SIRFUART_RX_DMA_IO_CTRL                 0x0120
+#define SIRFUART_RX_DMA_IO_LEN                  0x0124
+#define SIRFUART_RX_FIFO_CTRL                   0x0128
+#define SIRFUART_RX_FIFO_LEVEL_CHK              0x012C
+#define SIRFUART_RX_FIFO_OP                     0x0130
+#define SIRFUART_RX_FIFO_STATUS                 0x0134
+#define SIRFUART_RX_FIFO_DATA                   0x0138
+#define SIRFUART_AFC_CTRL                       0x0140
+#define SIRFUART_SWH_DMA_IO                     0x0148
+
+/* UART Line Control Register */
+#define SIRFUART_DATA_BIT_LEN_MASK              0x3
+#define SIRFUART_DATA_BIT_LEN_5                 BIT(0)
+#define SIRFUART_DATA_BIT_LEN_6                 1
+#define SIRFUART_DATA_BIT_LEN_7                 2
+#define SIRFUART_DATA_BIT_LEN_8                 3
+#define SIRFUART_STOP_BIT_LEN_1                 0
+#define SIRFUART_STOP_BIT_LEN_2                 BIT(2)
+#define SIRFUART_PARITY_EN                      BIT(3)
+#define SIRFUART_EVEN_BIT                       BIT(4)
+#define SIRFUART_STICK_BIT_MASK                 (7 << 3)
+#define SIRFUART_STICK_BIT_NONE                 (0 << 3)
+#define SIRFUART_STICK_BIT_EVEN                 BIT(3)
+#define SIRFUART_STICK_BIT_ODD                  (3 << 3)
+#define SIRFUART_STICK_BIT_MARK                 (5 << 3)
+#define SIRFUART_STICK_BIT_SPACE                (7 << 3)
+#define SIRFUART_SET_BREAK                      BIT(6)
+#define SIRFUART_LOOP_BACK                      BIT(7)
+#define SIRFUART_PARITY_MASK                    (7 << 3)
+#define SIRFUART_DUMMY_READ                     BIT(16)
+
+#define SIRFSOC_UART_RX_TIMEOUT(br, to) (((br) * (((to) + 999) / 1000)) / 1000)
+#define SIRFUART_RECV_TIMEOUT_MASK      (0xFFFF << 16)
+#define SIRFUART_RECV_TIMEOUT(x)        (((x) & 0xFFFF) << 16)
+
+/* UART Auto Flow Control */
+#define SIRFUART_AFC_RX_THD_MASK                0x000000FF
+#define SIRFUART_AFC_RX_EN                      BIT(8)
+#define SIRFUART_AFC_TX_EN                      BIT(9)
+#define SIRFUART_CTS_CTRL                       BIT(10)
+#define SIRFUART_RTS_CTRL                       BIT(11)
+#define SIRFUART_CTS_IN_STATUS                  BIT(12)
+#define SIRFUART_RTS_OUT_STATUS                 BIT(13)
+
+/* UART Interrupt Enable Register */
+#define SIRFUART_RX_DONE_INT                    BIT(0)
+#define SIRFUART_TX_DONE_INT                    BIT(1)
+#define SIRFUART_RX_OFLOW_INT                   BIT(2)
+#define SIRFUART_TX_ALLOUT_INT                  BIT(3)
+#define SIRFUART_RX_IO_DMA_INT                  BIT(4)
+#define SIRFUART_TX_IO_DMA_INT                  BIT(5)
+#define SIRFUART_RXFIFO_FULL_INT                BIT(6)
+#define SIRFUART_TXFIFO_EMPTY_INT               BIT(7)
+#define SIRFUART_RXFIFO_THD_INT                 BIT(8)
+#define SIRFUART_TXFIFO_THD_INT                 BIT(9)
+#define SIRFUART_FRM_ERR_INT                    BIT(10)
+#define SIRFUART_RXD_BREAK_INT                  BIT(11)
+#define SIRFUART_RX_TIMEOUT_INT                 BIT(12)
+#define SIRFUART_PARITY_ERR_INT                 BIT(13)
+#define SIRFUART_CTS_INT_EN                     BIT(14)
+#define SIRFUART_RTS_INT_EN                     BIT(15)
+
+/* UART Interrupt Status Register */
+#define SIRFUART_RX_DONE                        BIT(0)
+#define SIRFUART_TX_DONE                        BIT(1)
+#define SIRFUART_RX_OFLOW                       BIT(2)
+#define SIRFUART_TX_ALL_EMPTY                   BIT(3)
+#define SIRFUART_DMA_IO_RX_DONE                 BIT(4)
+#define SIRFUART_DMA_IO_TX_DONE                 BIT(5)
+#define SIRFUART_RXFIFO_FULL                    BIT(6)
+#define SIRFUART_TXFIFO_EMPTY                   BIT(7)
+#define SIRFUART_RXFIFO_THD_REACH               BIT(8)
+#define SIRFUART_TXFIFO_THD_REACH               BIT(9)
+#define SIRFUART_FRM_ERR                        BIT(10)
+#define SIRFUART_RXD_BREAK                      BIT(11)
+#define SIRFUART_RX_TIMEOUT                     BIT(12)
+#define SIRFUART_PARITY_ERR                     BIT(13)
+#define SIRFUART_CTS_CHANGE                     BIT(14)
+#define SIRFUART_RTS_CHANGE                     BIT(15)
+#define SIRFUART_PLUG_IN                        BIT(16)
+
+#define SIRFUART_ERR_INT_STAT                                   \
+                                (SIRFUART_RX_OFLOW |            \
+                                SIRFUART_FRM_ERR |              \
+                                SIRFUART_RXD_BREAK |            \
+                                SIRFUART_PARITY_ERR)
+#define SIRFUART_ERR_INT_EN                                     \
+                                (SIRFUART_RX_OFLOW_INT |        \
+                                SIRFUART_FRM_ERR_INT |          \
+                                SIRFUART_RXD_BREAK_INT |        \
+                                SIRFUART_PARITY_ERR_INT)
+#define SIRFUART_TX_INT_EN      SIRFUART_TXFIFO_EMPTY_INT
+#define SIRFUART_RX_IO_INT_EN                                   \
+                                (SIRFUART_RX_TIMEOUT_INT |      \
+                                SIRFUART_RXFIFO_THD_INT |       \
+                                SIRFUART_RXFIFO_FULL_INT |      \
+                                SIRFUART_ERR_INT_EN)
+
+/* UART FIFO Register */
+#define SIRFUART_TX_FIFO_STOP                   0x0
+#define SIRFUART_TX_FIFO_RESET                  0x1
+#define SIRFUART_TX_FIFO_START                  0x2
+#define SIRFUART_RX_FIFO_STOP                   0x0
+#define SIRFUART_RX_FIFO_RESET                  0x1
+#define SIRFUART_RX_FIFO_START                  0x2
+#define SIRFUART_TX_MODE_DMA                    0
+#define SIRFUART_TX_MODE_IO                     1
+#define SIRFUART_RX_MODE_DMA                    0
+#define SIRFUART_RX_MODE_IO                     1
+
+#define SIRFUART_RX_EN                          0x1
+#define SIRFUART_TX_EN                          0x2
+
+/* Generic Definitions */
+#define SIRFSOC_UART_NAME                       "ttySiRF"
+#define SIRFSOC_UART_MAJOR                      0
+#define SIRFSOC_UART_MINOR                      0
+#define SIRFUART_PORT_NAME                      "sirfsoc-uart"
+#define SIRFUART_MAP_SIZE                       0x200
+#define SIRFSOC_UART_NR                         3
+#define SIRFSOC_PORT_TYPE                       0xa5
+
+/* Baud Rate Calculation */
+#define SIRF_MIN_SAMPLE_DIV                     0xf
+#define SIRF_MAX_SAMPLE_DIV                     0x3f
+#define SIRF_IOCLK_DIV_MAX                      0xffff
+#define SIRF_SAMPLE_DIV_SHIFT                   16
+#define SIRF_IOCLK_DIV_MASK                     0xffff
+#define SIRF_SAMPLE_DIV_MASK                    0x3f0000
+#define SIRF_BAUD_RATE_SUPPORT_NR               18
+
+/* For Fast Baud Rate Calculation */
+struct sirfsoc_baudrate_to_regv {
+        unsigned int baud_rate;
+        unsigned int reg_val;
+};
+
+struct sirfsoc_uart_port {
+        unsigned char                   hw_flow_ctrl;
+        unsigned char                   ms_enabled;
+
+        struct uart_port                port;
+        struct pinmux                   *pmx;
+};
+
+/* Hardware Flow Control */
+#define SIRFUART_AFC_CTRL_RX_THD        0x70
+
+/* Register Access Control */
+#define portaddr(port, reg)             ((port)->membase + (reg))
+#define rd_regb(port, reg)              (__raw_readb(portaddr(port, reg)))
+#define rd_regl(port, reg)              (__raw_readl(portaddr(port, reg)))
+#define wr_regb(port, reg, val)         __raw_writeb(val, portaddr(port, reg))
+#define wr_regl(port, reg, val)         __raw_writel(val, portaddr(port, reg))
+
+/* UART Port Mask */
+#define SIRFUART_FIFOLEVEL_MASK(port)   ((port->line == 1) ? (0x1f) : (0x7f))
+#define SIRFUART_FIFOFULL_MASK(port)    ((port->line == 1) ? (0x20) : (0x80))
+#define SIRFUART_FIFOEMPTY_MASK(port)   ((port->line == 1) ? (0x40) : (0x100))
+
+/* I/O Mode */
+#define SIRFSOC_UART_IO_RX_MAX_CNT              256
+#define SIRFSOC_UART_IO_TX_REASONABLE_CNT       6