Alphascale ASM9260 uart IP has some common registers with Freescale STMP37XX. This patch provide changes which allow to reuse mxs-auart.c code for ASM9260. Signed-off-by: Oleksij Rempel <linux@xxxxxxxxxxxxxxxx> --- .../devicetree/bindings/serial/fsl-mxs-auart.txt | 14 +- drivers/tty/serial/Kconfig | 5 +- drivers/tty/serial/mxs-auart.c | 536 +++++++++++++++++---- 3 files changed, 449 insertions(+), 106 deletions(-) diff --git a/Documentation/devicetree/bindings/serial/fsl-mxs-auart.txt b/Documentation/devicetree/bindings/serial/fsl-mxs-auart.txt index 7c408c8..81e35cd 100644 --- a/Documentation/devicetree/bindings/serial/fsl-mxs-auart.txt +++ b/Documentation/devicetree/bindings/serial/fsl-mxs-auart.txt @@ -1,8 +1,10 @@ * Freescale MXS Application UART (AUART) -Required properties: -- compatible : Should be "fsl,<soc>-auart". The supported SoCs include - imx23 and imx28. +Required properties for all SoCs: +- compatible : Should be one of fallowing variants: + "fsl,imx23-auart" - Freescale i.MX23 + "fsl,imx28-auart" - Freescale i.MX28 + "alphascale,asm9260-auart" - Alphascale ASM9260 - reg : Address and length of the register set for the device - interrupts : Should contain the auart interrupt numbers - dmas: DMA specifier, consisting of a phandle to DMA controller node @@ -10,6 +12,12 @@ Required properties: Refer to dma.txt and fsl-mxs-dma.txt for details. - dma-names: "rx" for RX channel, "tx" for TX channel. +Required properties for "alphascale,asm9260-auart": +- clocks : the clocks feeding the watchdog timer. See clock-bindings.txt +- clock-names : should be set to + "mod" - source for tick counter. + "ahb" - ahb gate. + Optional properties: - fsl,uart-has-rtscts : Indicate the UART has RTS and CTS lines for hardware flow control, diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index 39721ec..d6120ca 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -1387,11 +1387,12 @@ config SERIAL_PCH_UART_CONSOLE config SERIAL_MXS_AUART tristate "MXS AUART support" depends on HAS_DMA - depends on ARCH_MXS || COMPILE_TEST + depends on ARCH_MXS || MACH_ASM9260 || COMPILE_TEST select SERIAL_CORE select SERIAL_MCTRL_GPIO if GPIOLIB help - This driver supports the MXS Application UART (AUART) port. + This driver supports the MXS and Alphascale ASM9260 Application + UART (AUART) port. config SERIAL_MXS_AUART_CONSOLE bool "MXS AUART console support" diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c index cd0414b..10a7a31 100644 --- a/drivers/tty/serial/mxs-auart.c +++ b/drivers/tty/serial/mxs-auart.c @@ -1,17 +1,18 @@ /* - * Freescale STMP37XX/STMP378X Application UART driver + * Application UART driver for: + * Freescale STMP37XX/STMP378X + * Alphascale ASM9260 * * Author: dmitry pervushin <dimka@xxxxxxxxxxxxxxxxx> * + * Copyright 2014 Oleksij Rempel <linux@xxxxxxxxxxxxxxxx> + * Provide Alphascale ASM9260 support. * Copyright 2008-2010 Freescale Semiconductor, Inc. * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved. * * The code contained herein is licensed under the GNU General Public * License. You may obtain a copy of the GNU General Public License * Version 2 or later at the following locations: - * - * http://www.opensource.org/licenses/gpl-license.html - * http://www.gnu.org/copyleft/gpl.html */ #if defined(CONFIG_SERIAL_MXS_AUART_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) @@ -51,30 +52,16 @@ #define MXS_AUART_PORTS 5 #define MXS_AUART_FIFO_SIZE 16 +#define SET_REG 0x4 +#define CLR_REG 0x8 +#define TOG_REG 0xc + #define AUART_CTRL0 0x00000000 -#define AUART_CTRL0_SET 0x00000004 -#define AUART_CTRL0_CLR 0x00000008 -#define AUART_CTRL0_TOG 0x0000000c #define AUART_CTRL1 0x00000010 -#define AUART_CTRL1_SET 0x00000014 -#define AUART_CTRL1_CLR 0x00000018 -#define AUART_CTRL1_TOG 0x0000001c #define AUART_CTRL2 0x00000020 -#define AUART_CTRL2_SET 0x00000024 -#define AUART_CTRL2_CLR 0x00000028 -#define AUART_CTRL2_TOG 0x0000002c #define AUART_LINECTRL 0x00000030 -#define AUART_LINECTRL_SET 0x00000034 -#define AUART_LINECTRL_CLR 0x00000038 -#define AUART_LINECTRL_TOG 0x0000003c #define AUART_LINECTRL2 0x00000040 -#define AUART_LINECTRL2_SET 0x00000044 -#define AUART_LINECTRL2_CLR 0x00000048 -#define AUART_LINECTRL2_TOG 0x0000004c #define AUART_INTR 0x00000050 -#define AUART_INTR_SET 0x00000054 -#define AUART_INTR_CLR 0x00000058 -#define AUART_INTR_TOG 0x0000005c #define AUART_DATA 0x00000060 #define AUART_STAT 0x00000070 #define AUART_DEBUG 0x00000080 @@ -136,11 +123,256 @@ #define AUART_STAT_FERR (1 << 16) #define AUART_STAT_RXCOUNT_MASK 0xffff +/* + * Start of Alphascale asm9260 defines + * This list contains only differences of existing bits + * between imx2x and asm9260 + */ +#define ASM9260_HW_CTRL0 0x0000 +/* + * RW. Tell the UART to execute the RX DMA Command. The + * UART will clear this bit at the end of receive execution. + */ +#define ASM9260_BM_CTRL0_RXDMA_RUN BIT(28) +/* RW. 0 use FIFO for status register; 1 use DMA */ +#define ASM9260_BM_CTRL0_RXTO_SOURCE_STATUS BIT(25) +/* + * RW. RX TIMEOUT Enable. Valid for FIFO and DMA. + * Warning: If this bit is set to 0, the RX timeout will not affect receive DMA + * operation. If this bit is set to 1, a receive timeout will cause the receive + * DMA logic to terminate by filling the remaining DMA bytes with garbage data. + */ +#define ASM9260_BM_CTRL0_RXTO_ENABLE BIT(24) +/* + * RW. Receive Timeout Counter Value: number of 8-bit-time to wait before + * asserting timeout on the RX input. If the RXFIFO is not empty and the RX + * input is idle, then the watchdog counter will decrement each bit-time. Note + * 7-bit-time is added to the programmed value, so a value of zero will set + * the counter to 7-bit-time, a value of 0x1 gives 15-bit-time and so on. Also + * note that the counter is reloaded at the end of each frame, so if the frame + * is 10 bits long and the timeout counter value is zero, then timeout will + * occur (when FIFO is not empty) even if the RX input is not idle. The default + * value is 0x3 (31 bit-time). + */ +#define ASM9260_BM_CTRL0_RXTO_MASK (0xff << 16) +/* TIMEOUT = (100*7+1)*(1/BAUD) */ +#define ASM9260_BM_CTRL0_DEFAULT_RXTIMEOUT (20 << 16) + +/* TX ctrl register */ +#define ASM9260_HW_CTRL1 0x0010 +/* + * RW. Tell the UART to execute the TX DMA Command. The + * UART will clear this bit at the end of transmit execution. + */ +#define ASM9260_BM_CTRL1_TXDMA_RUN BIT(28) + +#define ASM9260_HW_CTRL2 0x0020 +/* + * RW. Receive Interrupt FIFO Level Select. + * The trigger points for the receive interrupt are as follows: + * ONE_EIGHTHS = 0x0 Trigger on FIFO full to at least 2 of 16 entries. + * ONE_QUARTER = 0x1 Trigger on FIFO full to at least 4 of 16 entries. + * ONE_HALF = 0x2 Trigger on FIFO full to at least 8 of 16 entries. + * THREE_QUARTERS = 0x3 Trigger on FIFO full to at least 12 of 16 entries. + * SEVEN_EIGHTHS = 0x4 Trigger on FIFO full to at least 14 of 16 entries. + */ +#define ASM9260_BM_CTRL2_RXIFLSEL (7 << 20) +#define ASM9260_BM_CTRL2_DEFAULT_RXIFLSEL (3 << 20) +/* RW. Same as RXIFLSEL */ +#define ASM9260_BM_CTRL2_TXIFLSEL (7 << 16) +#define ASM9260_BM_CTRL2_DEFAULT_TXIFLSEL (2 << 16) +/* RW. Set DTR. When this bit is 1, the output is 0. */ +#define ASM9260_BM_CTRL2_DTR BIT(10) +/* RW. Loop Back Enable */ +#define ASM9260_BM_CTRL2_LBE BIT(7) +#define ASM9260_BM_CTRL2_PORT_ENABLE BIT(0) + +#define ASM9260_HW_LINECTRL 0x0030 +/* + * RW. Stick Parity Select. When bits 1, 2, and 7 of this register are set, the + * parity bit is transmitted and checked as a 0. When bits 1 and 7 are set, + * and bit 2 is 0, the parity bit is transmitted and checked as a 1. When this + * bit is cleared stick parity is disabled. + */ +#define ASM9260_BM_LCTRL_SPS BIT(7) +/* RW. Word length */ +#define ASM9260_BM_LCTRL_WLEN (3 << 5) +#define ASM9260_BM_LCTRL_CHRL_5 (0 << 5) +#define ASM9260_BM_LCTRL_CHRL_6 (1 << 5) +#define ASM9260_BM_LCTRL_CHRL_7 (2 << 5) +#define ASM9260_BM_LCTRL_CHRL_8 (3 << 5) + +/* + * Interrupt register. + * contains the interrupt enables and the interrupt status bits + */ +#define ASM9260_HW_INTR 0x0040 +/* Tx FIFO EMPTY Raw Interrupt enable */ +#define ASM9260_BM_INTR_TFEIEN BIT(27) +/* Overrun Error Interrupt Enable. */ +#define ASM9260_BM_INTR_OEIEN BIT(26) +/* Break Error Interrupt Enable. */ +#define ASM9260_BM_INTR_BEIEN BIT(25) +/* Parity Error Interrupt Enable. */ +#define ASM9260_BM_INTR_PEIEN BIT(24) +/* Framing Error Interrupt Enable. */ +#define ASM9260_BM_INTR_FEIEN BIT(23) + +/* nUARTDSR Modem Interrupt Enable. */ +#define ASM9260_BM_INTR_DSRMIEN BIT(19) +/* nUARTDCD Modem Interrupt Enable. */ +#define ASM9260_BM_INTR_DCDMIEN BIT(18) +/* nUARTRI Modem Interrupt Enable. */ +#define ASM9260_BM_INTR_RIMIEN BIT(16) +/* Auto-Boud Timeout */ +#define ASM9260_BM_INTR_ABTO BIT(13) +#define ASM9260_BM_INTR_ABEO BIT(12) +/* Tx FIFO EMPTY Raw Interrupt state */ +#define ASM9260_BM_INTR_TFEIS BIT(11) +/* Overrun Error */ +#define ASM9260_BM_INTR_OEIS BIT(10) +/* Break Error */ +#define ASM9260_BM_INTR_BEIS BIT(9) +/* Parity Error */ +#define ASM9260_BM_INTR_PEIS BIT(8) +/* Framing Error */ +#define ASM9260_BM_INTR_FEIS BIT(7) +#define ASM9260_BM_INTR_DSRMIS BIT(3) +#define ASM9260_BM_INTR_DCDMIS BIT(2) +#define ASM9260_BM_INTR_RIMIS BIT(0) + +/* + * RW. In DMA mode, up to 4 Received/Transmit characters can be accessed at a + * time. In PIO mode, only one character can be accessed at a time. The status + * register contains the receive data flags and valid bits. + */ +#define ASM9260_HW_DATA 0x0050 + +#define ASM9260_HW_STAT 0x0060 +/* RO. If 1, UARTAPP is present in this product. */ +#define ASM9260_BM_STAT_PRESENT BIT(31) +/* RO. If 1, HISPEED is present in this product. */ +#define ASM9260_BM_STAT_HISPEED BIT(30) +/* RO. Receive FIFO Full. */ +#define ASM9260_BM_STAT_RXFULL BIT(26) + +/* RO. The UART Debug Register contains the state of the DMA signals. */ +#define ASM9260_HW_DEBUG 0x0070 +/* DMA Command Run Status */ +#define ASM9260_BM_DEBUG_TXDMARUN BIT(5) +#define ASM9260_BM_DEBUG_RXDMARUN BIT(4) +/* DMA Command End Status */ +#define ASM9260_BM_DEBUG_TXCMDEND BIT(3) +#define ASM9260_BM_DEBUG_RXCMDEND BIT(2) +/* DMA Request Status */ +#define ASM9260_BM_DEBUG_TXDMARQ BIT(1) +#define ASM9260_BM_DEBUG_RXDMARQ BIT(0) + +#define ASM9260_HW_ILPR 0x0080 + +#define ASM9260_HW_RS485CTRL 0x0090 +/* + * RW. This bit reverses the polarity of the direction control signal on the RTS + * (or DTR) pin. + * If 0, The direction control pin will be driven to logic ‘0’ when the + * transmitter has data to be sent. It will be driven to logic ‘1’ after the + * last bit of data has been transmitted. + */ +#define ASM9260_BM_RS485CTRL_ONIV BIT(5) +/* RW. Enable Auto Direction Control. */ +#define ASM9260_BM_RS485CTRL_DIR_CTRL BIT(4) +/* + * RW. If 0 and DIR_CTRL = 1, pin RTS is used for direction control. + * If 1 and DIR_CTRL = 1, pin DTR is used for direction control. + */ +#define ASM9260_BM_RS485CTRL_PINSEL BIT(3) +/* RW. Enable Auto Address Detect (AAD). */ +#define ASM9260_BM_RS485CTRL_AADEN BIT(2) +/* RW. Disable receiver. */ +#define ASM9260_BM_RS485CTRL_RXDIS BIT(1) +/* RW. Enable RS-485/EIA-485 Normal Multidrop Mode (NMM) */ +#define ASM9260_BM_RS485CTRL_RS485EN BIT(0) + +#define ASM9260_HW_RS485ADRMATCH 0x00a0 +/* Contains the address match value. */ +#define ASM9260_BM_RS485ADRMATCH_MASK (0xff << 0) + +#define ASM9260_HW_RS485DLY 0x00b0 +/* + * RW. Contains the direction control (RTS or DTR) delay value. This delay time + * is in periods of the baud clock. + */ +#define ASM9260_BM_RS485DLY_MASK (0xff << 0) + +#define ASM9260_HW_AUTOBAUD 0x00c0 +/* WO. Auto-baud time-out interrupt clear bit. */ +#define ASM9260_BM_AUTOBAUD_TO_INT_CLR BIT(9) +/* WO. End of auto-baud interrupt clear bit. */ +#define ASM9260_BM_AUTOBAUD_EO_INT_CLR BIT(8) +/* Restart in case of timeout (counter restarts at next UART Rx falling edge) */ +#define ASM9260_BM_AUTOBAUD_AUTORESTART BIT(2) +/* Auto-baud mode select bit. 0 - Mode 0, 1 - Mode 1. */ +#define ASM9260_BM_AUTOBAUD_MODE BIT(1) +/* + * Auto-baud start (auto-baud is running). Auto-baud run bit. This bit is + * automatically cleared after auto-baud completion. + */ +#define ASM9260_BM_AUTOBAUD_START BIT(0) + +#define ASM9260_HW_CTRL3 0x00d0 +#define ASM9260_BM_CTRL3_OUTCLK_DIV_MASK (0xffff << 16) +/* + * RW. Provide clk over OUTCLK pin. In case of asm9260 it can be configured on + * pins 137 and 144. + */ +#define ASM9260_BM_CTRL3_MASTERMODE BIT(6) +/* RW. Baud Rate Mode: 1 - Enable sync mode. 0 - async mode. */ +#define ASM9260_BM_CTRL3_SYNCMODE BIT(4) +/* RW. 1 - MSB bit send frist; 0 - LSB bit frist. */ +#define ASM9260_BM_CTRL3_MSBF BIT(2) +/* RW. 1 - sample rate = 8 x Baudrate; 0 - sample rate = 16 x Baudrate. */ +#define ASM9260_BM_CTRL3_BAUD8 BIT(1) +/* RW. 1 - Set word length to 9bit. 0 - use ASM9260_BM_LCTRL_WLEN */ +#define ASM9260_BM_CTRL3_9BIT BIT(0) + +#define ASM9260_HW_ISO7816_CTRL 0x00e0 +/* RW. Enable High Speed mode. */ +#define ASM9260_BM_ISO7816CTRL_HS BIT(12) +/* Disable Successive Receive NACK */ +#define ASM9260_BM_ISO7816CTRL_DS_NACK BIT(8) +#define ASM9260_BM_ISO7816CTRL_MAX_ITER_MASK (0xff << 4) +/* Receive NACK Inhibit */ +#define ASM9260_BM_ISO7816CTRL_INACK BIT(3) +#define ASM9260_BM_ISO7816CTRL_NEG_DATA BIT(2) +/* RW. 1 - ISO7816 mode; 0 - USART mode */ +#define ASM9260_BM_ISO7816CTRL_ENABLE BIT(0) + +#define ASM9260_HW_ISO7816_ERRCNT 0x00f0 +/* Parity error counter. Will be cleared after reading */ +#define ASM9260_BM_ISO7816_NB_ERRORS_MASK (0xff << 0) + +#define ASM9260_HW_ISO7816_STATUS 0x0100 +/* Max number of Repetitions Reached */ +#define ASM9260_BM_ISO7816_STAT_ITERATION BIT(0) + +/* End of Alphascale asm9260 defines */ + static struct uart_driver auart_driver; enum mxs_auart_type { IMX23_AUART, IMX28_AUART, + ASM9260_AUART, +}; + +struct mxs_auart_regs { + void __iomem *ctrl0; + void __iomem *ctrl1; + void __iomem *ctrl2; + void __iomem *linectrl; + void __iomem *intr; + void __iomem *data; + void __iomem *stat; }; struct mxs_auart_port { @@ -154,7 +386,10 @@ struct mxs_auart_port { unsigned int mctrl_prev; enum mxs_auart_type devtype; + struct mxs_auart_regs regs; + struct clk *clk; + struct clk *clk_ahb; struct device *dev; /* for DMA */ @@ -174,6 +409,7 @@ struct mxs_auart_port { static const struct platform_device_id mxs_auart_devtype[] = { { .name = "mxs-auart-imx23", .driver_data = IMX23_AUART }, { .name = "mxs-auart-imx28", .driver_data = IMX28_AUART }, + { .name = "as-auart-asm9260", .driver_data = ASM9260_AUART }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(platform, mxs_auart_devtype); @@ -185,6 +421,9 @@ static const struct of_device_id mxs_auart_dt_ids[] = { }, { .compatible = "fsl,imx23-auart", .data = &mxs_auart_devtype[IMX23_AUART] + }, { + .compatible = "alphascale,asm9260-auart", + .data = &mxs_auart_devtype[ASM9260_AUART] }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, mxs_auart_dt_ids); @@ -194,6 +433,11 @@ static inline int is_imx28_auart(struct mxs_auart_port *s) return s->devtype == IMX28_AUART; } +static inline int is_asm9260_auart(struct mxs_auart_port *s) +{ + return s->devtype == ASM9260_AUART; +} + static inline bool auart_dma_enabled(struct mxs_auart_port *s) { return s->flags & MXS_AUART_DMA_ENABLED; @@ -295,19 +539,19 @@ static void mxs_auart_tx_chars(struct mxs_auart_port *s) } - while (!(readl(s->port.membase + AUART_STAT) & + while (!(readl(s->regs.stat) & AUART_STAT_TXFF)) { if (s->port.x_char) { s->port.icount.tx++; writel(s->port.x_char, - s->port.membase + AUART_DATA); + s->regs.data); s->port.x_char = 0; continue; } if (!uart_circ_empty(xmit) && !uart_tx_stopped(&s->port)) { s->port.icount.tx++; writel(xmit->buf[xmit->tail], - s->port.membase + AUART_DATA); + s->regs.data); xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); } else break; @@ -317,10 +561,10 @@ static void mxs_auart_tx_chars(struct mxs_auart_port *s) if (uart_circ_empty(&(s->port.state->xmit))) writel(AUART_INTR_TXIEN, - s->port.membase + AUART_INTR_CLR); + s->regs.intr + CLR_REG); else writel(AUART_INTR_TXIEN, - s->port.membase + AUART_INTR_SET); + s->regs.intr + SET_REG); if (uart_tx_stopped(&s->port)) mxs_auart_stop_tx(&s->port); @@ -332,8 +576,8 @@ static void mxs_auart_rx_char(struct mxs_auart_port *s) u32 stat; u8 c; - c = readl(s->port.membase + AUART_DATA); - stat = readl(s->port.membase + AUART_STAT); + c = readl(s->regs.data); + stat = readl(s->regs.stat); flag = TTY_NORMAL; s->port.icount.rx++; @@ -368,7 +612,7 @@ static void mxs_auart_rx_char(struct mxs_auart_port *s) uart_insert_char(&s->port, stat, AUART_STAT_OERR, c, flag); out: - writel(stat, s->port.membase + AUART_STAT); + writel(stat, s->regs.stat); } static void mxs_auart_rx_chars(struct mxs_auart_port *s) @@ -376,13 +620,13 @@ static void mxs_auart_rx_chars(struct mxs_auart_port *s) u32 stat = 0; for (;;) { - stat = readl(s->port.membase + AUART_STAT); + stat = readl(s->regs.stat); if (stat & AUART_STAT_RXFE) break; mxs_auart_rx_char(s); } - writel(stat, s->port.membase + AUART_STAT); + writel(stat, s->regs.stat); tty_flip_buffer_push(&s->port.state->port); } @@ -418,7 +662,7 @@ static void mxs_auart_set_mctrl(struct uart_port *u, unsigned mctrl) { struct mxs_auart_port *s = to_auart_port(u); - u32 ctrl = readl(u->membase + AUART_CTRL2); + u32 ctrl = readl(s->regs.ctrl2); ctrl &= ~(AUART_CTRL2_RTSEN | AUART_CTRL2_RTS); if (mctrl & TIOCM_RTS) { @@ -428,7 +672,7 @@ static void mxs_auart_set_mctrl(struct uart_port *u, unsigned mctrl) ctrl |= AUART_CTRL2_RTS; } - writel(ctrl, u->membase + AUART_CTRL2); + writel(ctrl, s->regs.ctrl2); mctrl_gpio_set(s->gpios, mctrl); } @@ -459,7 +703,7 @@ static u32 mxs_auart_modem_status(struct mxs_auart_port *s, u32 mctrl) static u32 mxs_auart_get_mctrl(struct uart_port *u) { struct mxs_auart_port *s = to_auart_port(u); - u32 stat = readl(u->membase + AUART_STAT); + u32 stat = readl(s->regs.stat); u32 mctrl = 0; if (stat & AUART_STAT_CTS) @@ -536,14 +780,14 @@ static void dma_rx_callback(void *arg) dma_unmap_sg(s->dev, &s->rx_sgl, 1, DMA_FROM_DEVICE); - stat = readl(s->port.membase + AUART_STAT); + stat = readl(s->regs.stat); stat &= ~(AUART_STAT_OERR | AUART_STAT_BERR | AUART_STAT_PERR | AUART_STAT_FERR); count = stat & AUART_STAT_RXCOUNT_MASK; tty_insert_flip_string(port, s->rx_dma_buf, count); - writel(stat, s->port.membase + AUART_STAT); + writel(stat, s->regs.stat); tty_flip_buffer_push(port); /* start the next DMA for RX. */ @@ -607,7 +851,7 @@ static void mxs_auart_dma_exit(struct mxs_auart_port *s) { writel(AUART_CTRL2_TXDMAE | AUART_CTRL2_RXDMAE | AUART_CTRL2_DMAONERR, - s->port.membase + AUART_CTRL2_CLR); + s->regs.ctrl2 + CLR_REG); mxs_auart_dma_exit_channel(s); s->flags &= ~MXS_AUART_DMA_ENABLED; @@ -666,7 +910,7 @@ static void mxs_auart_settermios(struct uart_port *u, cflag = termios->c_cflag; ctrl = AUART_LINECTRL_FEN; - ctrl2 = readl(u->membase + AUART_CTRL2); + ctrl2 = readl(s->regs.ctrl2); /* byte size */ switch (cflag & CSIZE) { @@ -754,15 +998,24 @@ static void mxs_auart_settermios(struct uart_port *u, } /* set baud rate */ - baud_min = DIV_ROUND_UP(u->uartclk * 32, AUART_LINECTRL_BAUD_DIV_MAX); - baud_max = u->uartclk * 32 / AUART_LINECTRL_BAUD_DIV_MIN; - baud = uart_get_baud_rate(u, termios, old, baud_min, baud_max); - div = u->uartclk * 32 / baud; + if (is_asm9260_auart(s)) { + baud = uart_get_baud_rate(u, termios, old, + u->uartclk * 4 / 0x3FFFFF, + u->uartclk / 16); + div = u->uartclk * 4 / baud; + } else { + baud_min = DIV_ROUND_UP(u->uartclk * 32, + AUART_LINECTRL_BAUD_DIV_MAX); + baud_max = u->uartclk * 32 / AUART_LINECTRL_BAUD_DIV_MIN; + baud = uart_get_baud_rate(u, termios, old, baud_min, baud_max); + div = u->uartclk * 32 / baud; + } + ctrl |= AUART_LINECTRL_BAUD_DIVFRAC(div & 0x3F); ctrl |= AUART_LINECTRL_BAUD_DIVINT(div >> 6); + writel(ctrl, s->regs.linectrl); - writel(ctrl, u->membase + AUART_LINECTRL); - writel(ctrl2, u->membase + AUART_CTRL2); + writel(ctrl2, s->regs.ctrl2); uart_update_timeout(u, termios->c_cflag, baud); @@ -772,7 +1025,7 @@ static void mxs_auart_settermios(struct uart_port *u, if (!mxs_auart_dma_prep_rx(s)) { /* Disable the normal RX interrupt. */ writel(AUART_INTR_RXIEN | AUART_INTR_RTIEN, - u->membase + AUART_INTR_CLR); + s->regs.intr + CLR_REG); } else { mxs_auart_dma_exit(s); dev_err(s->dev, "We can not start up the DMA.\n"); @@ -802,16 +1055,16 @@ static irqreturn_t mxs_auart_irq_handle(int irq, void *context) u32 istat; struct mxs_auart_port *s = context; u32 mctrl_temp = s->mctrl_prev; - u32 stat = readl(s->port.membase + AUART_STAT); + u32 stat = readl(s->regs.stat); - istat = readl(s->port.membase + AUART_INTR); + istat = readl(s->regs.intr); /* ack irq */ writel(istat & (AUART_INTR_RTIS | AUART_INTR_TXIS | AUART_INTR_RXIS | AUART_INTR_CTSMIS), - s->port.membase + AUART_INTR_CLR); + s->regs.intr + CLR_REG); /* * Dealing with GPIO interrupt @@ -828,7 +1081,7 @@ static irqreturn_t mxs_auart_irq_handle(int irq, void *context) uart_handle_cts_change(&s->port, stat & AUART_STAT_CTS); writel(AUART_INTR_CTSMIS, - s->port.membase + AUART_INTR_CLR); + s->regs.intr + CLR_REG); istat &= ~AUART_INTR_CTSMIS; } @@ -846,44 +1099,44 @@ static irqreturn_t mxs_auart_irq_handle(int irq, void *context) return IRQ_HANDLED; } -static void mxs_auart_reset_deassert(struct uart_port *u) +static void mxs_auart_reset_deassert(struct mxs_auart_port *s) { int i; unsigned int reg; - writel(AUART_CTRL0_SFTRST, u->membase + AUART_CTRL0_CLR); + writel(AUART_CTRL0_SFTRST, s->regs.ctrl0 + CLR_REG); for (i = 0; i < 10000; i++) { - reg = readl(u->membase + AUART_CTRL0); + reg = readl(s->regs.ctrl0); if (!(reg & AUART_CTRL0_SFTRST)) break; udelay(3); } - writel(AUART_CTRL0_CLKGATE, u->membase + AUART_CTRL0_CLR); + writel(AUART_CTRL0_CLKGATE, s->regs.ctrl0 + CLR_REG); } -static void mxs_auart_reset_assert(struct uart_port *u) +static void mxs_auart_reset_assert(struct mxs_auart_port *s) { int i; u32 reg; - reg = readl(u->membase + AUART_CTRL0); + reg = readl(s->regs.ctrl0); /* if already in reset state, keep it untouched */ if (reg & AUART_CTRL0_SFTRST) return; - writel(AUART_CTRL0_CLKGATE, u->membase + AUART_CTRL0_CLR); - writel(AUART_CTRL0_SFTRST, u->membase + AUART_CTRL0_SET); + writel(AUART_CTRL0_CLKGATE, s->regs.ctrl0 + CLR_REG); + writel(AUART_CTRL0_SFTRST, s->regs.ctrl0 + SET_REG); for (i = 0; i < 1000; i++) { - reg = readl(u->membase + AUART_CTRL0); + reg = readl(s->regs.ctrl0); /* reset is finished when the clock is gated */ if (reg & AUART_CTRL0_CLKGATE) return; udelay(10); } - dev_err(u->dev, "Failed to reset the unit."); + dev_err(s->dev, "Failed to reset the unit."); } static int mxs_auart_startup(struct uart_port *u) @@ -896,17 +1149,17 @@ static int mxs_auart_startup(struct uart_port *u) return ret; if (uart_console(u)) { - writel(AUART_CTRL0_CLKGATE, u->membase + AUART_CTRL0_CLR); + writel(AUART_CTRL0_CLKGATE, s->regs.ctrl0 + CLR_REG); } else { /* reset the unit to a well known state */ - mxs_auart_reset_assert(u); - mxs_auart_reset_deassert(u); + mxs_auart_reset_assert(s); + mxs_auart_reset_deassert(s); } - writel(AUART_CTRL2_UARTEN, u->membase + AUART_CTRL2_SET); + writel(AUART_CTRL2_UARTEN, s->regs.ctrl2 + SET_REG); writel(AUART_INTR_RXIEN | AUART_INTR_RTIEN | AUART_INTR_CTSMIEN, - u->membase + AUART_INTR); + s->regs.intr); /* Reset FIFO size (it could have changed if DMA was enabled) */ u->fifosize = MXS_AUART_FIFO_SIZE; @@ -915,7 +1168,7 @@ static int mxs_auart_startup(struct uart_port *u) * Enable fifo so all four bytes of a DMA word are written to * output (otherwise, only the LSB is written, ie. 1 in 4 bytes) */ - writel(AUART_LINECTRL_FEN, u->membase + AUART_LINECTRL_SET); + writel(AUART_LINECTRL_FEN, s->regs.linectrl + SET_REG); /* get initial status of modem lines */ mctrl_gpio_get(s->gpios, &s->mctrl_prev); @@ -934,12 +1187,13 @@ static void mxs_auart_shutdown(struct uart_port *u) mxs_auart_dma_exit(s); if (uart_console(u)) { - writel(AUART_CTRL2_UARTEN, u->membase + AUART_CTRL2_CLR); + writel(AUART_CTRL2_UARTEN, s->regs.ctrl2 + CLR_REG); + writel(AUART_INTR_RXIEN | AUART_INTR_RTIEN | AUART_INTR_CTSMIEN, - u->membase + AUART_INTR_CLR); - writel(AUART_CTRL0_CLKGATE, u->membase + AUART_CTRL0_SET); + s->regs.intr + CLR_REG); + writel(AUART_CTRL0_CLKGATE, s->regs.ctrl0 + SET_REG); } else { - mxs_auart_reset_assert(u); + mxs_auart_reset_assert(s); } clk_disable_unprepare(s->clk); @@ -947,7 +1201,9 @@ static void mxs_auart_shutdown(struct uart_port *u) static unsigned int mxs_auart_tx_empty(struct uart_port *u) { - if ((readl(u->membase + AUART_STAT) & + struct mxs_auart_port *s = to_auart_port(u); + + if ((readl(s->regs.stat) & (AUART_STAT_TXFE | AUART_STAT_BUSY)) == AUART_STAT_TXFE) return TIOCSER_TEMT; @@ -959,29 +1215,35 @@ static void mxs_auart_start_tx(struct uart_port *u) struct mxs_auart_port *s = to_auart_port(u); /* enable transmitter */ - writel(AUART_CTRL2_TXE, u->membase + AUART_CTRL2_SET); + writel(AUART_CTRL2_TXE, s->regs.ctrl2 + SET_REG); mxs_auart_tx_chars(s); } static void mxs_auart_stop_tx(struct uart_port *u) { - writel(AUART_CTRL2_TXE, u->membase + AUART_CTRL2_CLR); + struct mxs_auart_port *s = to_auart_port(u); + + writel(AUART_CTRL2_TXE, s->regs.ctrl2 + CLR_REG); } static void mxs_auart_stop_rx(struct uart_port *u) { - writel(AUART_CTRL2_RXE, u->membase + AUART_CTRL2_CLR); + struct mxs_auart_port *s = to_auart_port(u); + + writel(AUART_CTRL2_RXE, s->regs.ctrl2 + CLR_REG); } static void mxs_auart_break_ctl(struct uart_port *u, int ctl) { + struct mxs_auart_port *s = to_auart_port(u); + if (ctl) writel(AUART_LINECTRL_BRK, - u->membase + AUART_LINECTRL_SET); + s->regs.linectrl + SET_REG); else writel(AUART_LINECTRL_BRK, - u->membase + AUART_LINECTRL_CLR); + s->regs.linectrl + CLR_REG); } static struct uart_ops mxs_auart_ops = { @@ -1009,15 +1271,16 @@ static struct mxs_auart_port *auart_port[MXS_AUART_PORTS]; #ifdef CONFIG_SERIAL_MXS_AUART_CONSOLE static void mxs_auart_console_putchar(struct uart_port *port, int ch) { + struct mxs_auart_port *s = to_auart_port(port); unsigned int to = 1000; - while (readl(port->membase + AUART_STAT) & AUART_STAT_TXFF) { + while (readl(s->regs.stat) & AUART_STAT_TXFF) { if (!to--) break; udelay(1); } - writel(ch, port->membase + AUART_DATA); + writel(ch, s->regs.data); } static void @@ -1037,18 +1300,18 @@ auart_console_write(struct console *co, const char *str, unsigned int count) clk_enable(s->clk); /* First save the CR then disable the interrupts */ - old_ctrl2 = readl(port->membase + AUART_CTRL2); - old_ctrl0 = readl(port->membase + AUART_CTRL0); + old_ctrl2 = readl(s->regs.ctrl2); + old_ctrl0 = readl(s->regs.ctrl0); writel(AUART_CTRL0_CLKGATE, - port->membase + AUART_CTRL0_CLR); + s->regs.ctrl0 + CLR_REG); writel(AUART_CTRL2_UARTEN | AUART_CTRL2_TXE, - port->membase + AUART_CTRL2_SET); + s->regs.ctrl2 + SET_REG); uart_console_write(port, str, count, mxs_auart_console_putchar); /* Finally, wait for transmitter to become empty ... */ - while (readl(port->membase + AUART_STAT) & AUART_STAT_BUSY) { + while (readl(s->regs.stat) & AUART_STAT_BUSY) { udelay(1); if (!to--) break; @@ -1060,24 +1323,25 @@ auart_console_write(struct console *co, const char *str, unsigned int count) * unused, but that is better than to disable it while it is still * transmitting. */ - if (!(readl(port->membase + AUART_STAT) & AUART_STAT_BUSY)) { - writel(old_ctrl0, port->membase + AUART_CTRL0); - writel(old_ctrl2, port->membase + AUART_CTRL2); + if (!(readl(s->regs.stat) & AUART_STAT_BUSY)) { + writel(old_ctrl0, s->regs.ctrl0); + writel(old_ctrl2, s->regs.ctrl2); } clk_disable(s->clk); } static void __init -auart_console_get_options(struct uart_port *port, int *baud, +auart_console_get_options(struct mxs_auart_port *s, int *baud, int *parity, int *bits) { + struct uart_port *port = &s->port; unsigned int lcr_h, quot; - if (!(readl(port->membase + AUART_CTRL2) & AUART_CTRL2_UARTEN)) + if (!(readl(s->regs.ctrl2) & AUART_CTRL2_UARTEN)) return; - lcr_h = readl(port->membase + AUART_LINECTRL); + lcr_h = readl(s->regs.linectrl); *parity = 'n'; if (lcr_h & AUART_LINECTRL_PEN) { @@ -1092,10 +1356,10 @@ auart_console_get_options(struct uart_port *port, int *baud, else *bits = 8; - quot = ((readl(port->membase + AUART_LINECTRL) + quot = ((readl(s->regs.linectrl) & AUART_LINECTRL_BAUD_DIVINT_MASK)) >> (AUART_LINECTRL_BAUD_DIVINT_SHIFT - 6); - quot |= ((readl(port->membase + AUART_LINECTRL) + quot |= ((readl(s->regs.linectrl) & AUART_LINECTRL_BAUD_DIVFRAC_MASK)) >> AUART_LINECTRL_BAUD_DIVFRAC_SHIFT; if (quot == 0) @@ -1132,7 +1396,7 @@ auart_console_setup(struct console *co, char *options) if (options) uart_parse_options(options, &baud, &parity, &bits, &flow); else - auart_console_get_options(&s->port, &baud, &parity, &bits); + auart_console_get_options(s, &baud, &parity, &bits); ret = uart_set_options(&s->port, co, baud, parity, bits, flow); @@ -1164,6 +1428,62 @@ static struct uart_driver auart_driver = { #endif }; +static void mxs_init_regs(struct mxs_auart_port *s) +{ + s->regs.ctrl0 = s->port.membase + AUART_CTRL0; + s->regs.ctrl1 = s->port.membase + AUART_CTRL1; + s->regs.ctrl2 = s->port.membase + AUART_CTRL2; + s->regs.linectrl = s->port.membase + AUART_LINECTRL; + + if (is_asm9260_auart(s)) { + s->regs.intr = s->port.membase + ASM9260_HW_INTR; + s->regs.data = s->port.membase + ASM9260_HW_DATA; + s->regs.stat = s->port.membase + ASM9260_HW_STAT; + } else { + s->regs.intr = s->port.membase + AUART_INTR; + s->regs.data = s->port.membase + AUART_DATA; + s->regs.stat = s->port.membase + AUART_STAT; + } +} + +static int mxs_get_dt_clks(struct mxs_auart_port *s, + struct platform_device *pdev) +{ + int err; + + s->clk = devm_clk_get(s->dev, "mod"); + if (IS_ERR(s->clk)) { + dev_err(s->dev, "Failed to get \"mod\" clk\n"); + return PTR_ERR(s->clk); + } + + s->clk_ahb = devm_clk_get(s->dev, "ahb"); + if (IS_ERR(s->clk_ahb)) { + dev_err(s->dev, "Failed to get \"ahb\" clk\n"); + return PTR_ERR(s->clk_ahb); + } + + err = clk_prepare_enable(s->clk_ahb); + if (err) { + dev_err(s->dev, "Failed to enable ahb_clk!\n"); + return err; + } + + err = clk_set_rate(s->clk, clk_get_rate(s->clk_ahb)); + if (err) { + dev_err(s->dev, "Failed to set rate!\n"); + return err; + } + + err = clk_prepare_enable(s->clk); + if (err) { + dev_err(s->dev, "Failed to enable clk!\n"); + return err; + } + + return 0; +} + /* * This function returns 1 if pdev isn't a device instatiated by dt, 0 if it * could successfully get all information from dt or a negative errno. @@ -1269,6 +1589,9 @@ static int mxs_auart_probe(struct platform_device *pdev) if (!s) return -ENOMEM; + s->port.dev = &pdev->dev; + s->dev = &pdev->dev; + ret = serial_mxs_probe_dt(s, pdev); if (ret > 0) s->port.line = pdev->id < 0 ? 0 : pdev->id; @@ -1280,9 +1603,14 @@ static int mxs_auart_probe(struct platform_device *pdev) s->devtype = pdev->id_entry->driver_data; } - s->clk = devm_clk_get(&pdev->dev, NULL); - if (IS_ERR(s->clk)) - return PTR_ERR(s->clk); + if (is_asm9260_auart(s)) { + if (mxs_get_dt_clks(s, pdev)) + return -ENODEV; + } else { + s->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(s->clk)) + return PTR_ERR(s->clk); + } r = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!r) @@ -1296,7 +1624,8 @@ static int mxs_auart_probe(struct platform_device *pdev) s->port.fifosize = MXS_AUART_FIFO_SIZE; s->port.uartclk = clk_get_rate(s->clk); s->port.type = PORT_IMX; - s->port.dev = s->dev = &pdev->dev; + + mxs_init_regs(s); s->mctrl_prev = 0; @@ -1327,16 +1656,21 @@ static int mxs_auart_probe(struct platform_device *pdev) auart_port[s->port.line] = s; - mxs_auart_reset_deassert(&s->port); + mxs_auart_reset_deassert(s); ret = uart_add_one_port(&auart_driver, &s->port); if (ret) goto out_free_gpio_irq; - version = readl(s->port.membase + AUART_VERSION); - dev_info(&pdev->dev, "Found APPUART %d.%d.%d\n", - (version >> 24) & 0xff, - (version >> 16) & 0xff, version & 0xffff); + /* ASM9260 don't have version reg */ + if (is_asm9260_auart(s)) { + dev_info(&pdev->dev, "Found APPUART ASM9260\n"); + } else { + version = readl(s->port.membase + AUART_VERSION); + dev_info(&pdev->dev, "Found APPUART %d.%d.%d\n", + (version >> 24) & 0xff, + (version >> 16) & 0xff, version & 0xffff); + } return 0; -- 2.5.0 -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
