1e3b3d0f5SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 2ab4382d2SGreg Kroah-Hartman /* 3ab4382d2SGreg Kroah-Hartman * uartlite.c: Serial driver for Xilinx uartlite serial controller 4ab4382d2SGreg Kroah-Hartman * 5ab4382d2SGreg Kroah-Hartman * Copyright (C) 2006 Peter Korsgaard <jacmet@sunsite.dk> 6ab4382d2SGreg Kroah-Hartman * Copyright (C) 2007 Secret Lab Technologies Ltd. 7ab4382d2SGreg Kroah-Hartman */ 8ab4382d2SGreg Kroah-Hartman 9ab4382d2SGreg Kroah-Hartman #include <linux/platform_device.h> 10ab4382d2SGreg Kroah-Hartman #include <linux/module.h> 11ab4382d2SGreg Kroah-Hartman #include <linux/console.h> 12ab4382d2SGreg Kroah-Hartman #include <linux/serial.h> 13ab4382d2SGreg Kroah-Hartman #include <linux/serial_core.h> 14ab4382d2SGreg Kroah-Hartman #include <linux/tty.h> 15ee160a38SJiri Slaby #include <linux/tty_flip.h> 16ab4382d2SGreg Kroah-Hartman #include <linux/delay.h> 17ab4382d2SGreg Kroah-Hartman #include <linux/interrupt.h> 18ab4382d2SGreg Kroah-Hartman #include <linux/init.h> 193240b48dSMichal Simek #include <linux/io.h> 20ab4382d2SGreg Kroah-Hartman #include <linux/of.h> 21ab4382d2SGreg Kroah-Hartman #include <linux/of_address.h> 22ab4382d2SGreg Kroah-Hartman #include <linux/of_device.h> 23ab4382d2SGreg Kroah-Hartman #include <linux/of_platform.h> 2414288befSShubhrajyoti Datta #include <linux/clk.h> 25ab4382d2SGreg Kroah-Hartman 26ab4382d2SGreg Kroah-Hartman #define ULITE_NAME "ttyUL" 27ab4382d2SGreg Kroah-Hartman #define ULITE_MAJOR 204 28ab4382d2SGreg Kroah-Hartman #define ULITE_MINOR 187 29b44b96a0SSam Povilus #define ULITE_NR_UARTS CONFIG_SERIAL_UARTLITE_NR_UARTS 30ab4382d2SGreg Kroah-Hartman 31ab4382d2SGreg Kroah-Hartman /* --------------------------------------------------------------------- 32ab4382d2SGreg Kroah-Hartman * Register definitions 33ab4382d2SGreg Kroah-Hartman * 34ab4382d2SGreg Kroah-Hartman * For register details see datasheet: 3582ee0b14SAlexander A. Klimov * https://www.xilinx.com/support/documentation/ip_documentation/opb_uartlite.pdf 36ab4382d2SGreg Kroah-Hartman */ 37ab4382d2SGreg Kroah-Hartman 38ab4382d2SGreg Kroah-Hartman #define ULITE_RX 0x00 39ab4382d2SGreg Kroah-Hartman #define ULITE_TX 0x04 40ab4382d2SGreg Kroah-Hartman #define ULITE_STATUS 0x08 41ab4382d2SGreg Kroah-Hartman #define ULITE_CONTROL 0x0c 42ab4382d2SGreg Kroah-Hartman 43ab4382d2SGreg Kroah-Hartman #define ULITE_REGION 16 44ab4382d2SGreg Kroah-Hartman 45ab4382d2SGreg Kroah-Hartman #define ULITE_STATUS_RXVALID 0x01 46ab4382d2SGreg Kroah-Hartman #define ULITE_STATUS_RXFULL 0x02 47ab4382d2SGreg Kroah-Hartman #define ULITE_STATUS_TXEMPTY 0x04 48ab4382d2SGreg Kroah-Hartman #define ULITE_STATUS_TXFULL 0x08 49ab4382d2SGreg Kroah-Hartman #define ULITE_STATUS_IE 0x10 50ab4382d2SGreg Kroah-Hartman #define ULITE_STATUS_OVERRUN 0x20 51ab4382d2SGreg Kroah-Hartman #define ULITE_STATUS_FRAME 0x40 52ab4382d2SGreg Kroah-Hartman #define ULITE_STATUS_PARITY 0x80 53ab4382d2SGreg Kroah-Hartman 54ab4382d2SGreg Kroah-Hartman #define ULITE_CONTROL_RST_TX 0x01 55ab4382d2SGreg Kroah-Hartman #define ULITE_CONTROL_RST_RX 0x02 56ab4382d2SGreg Kroah-Hartman #define ULITE_CONTROL_IE 0x10 57ab4382d2SGreg Kroah-Hartman 58deeb33e8SShubhrajyoti Datta /* Static pointer to console port */ 59deeb33e8SShubhrajyoti Datta #ifdef CONFIG_SERIAL_UARTLITE_CONSOLE 60deeb33e8SShubhrajyoti Datta static struct uart_port *console_port; 61deeb33e8SShubhrajyoti Datta #endif 62deeb33e8SShubhrajyoti Datta 63da7bf20eSShubhrajyoti Datta struct uartlite_data { 64da7bf20eSShubhrajyoti Datta const struct uartlite_reg_ops *reg_ops; 6514288befSShubhrajyoti Datta struct clk *clk; 66da7bf20eSShubhrajyoti Datta }; 67da7bf20eSShubhrajyoti Datta 686d53c3b7SMichal Simek struct uartlite_reg_ops { 696d53c3b7SMichal Simek u32 (*in)(void __iomem *addr); 706d53c3b7SMichal Simek void (*out)(u32 val, void __iomem *addr); 716d53c3b7SMichal Simek }; 726d53c3b7SMichal Simek 736d53c3b7SMichal Simek static u32 uartlite_inbe32(void __iomem *addr) 746d53c3b7SMichal Simek { 756d53c3b7SMichal Simek return ioread32be(addr); 766d53c3b7SMichal Simek } 776d53c3b7SMichal Simek 786d53c3b7SMichal Simek static void uartlite_outbe32(u32 val, void __iomem *addr) 796d53c3b7SMichal Simek { 806d53c3b7SMichal Simek iowrite32be(val, addr); 816d53c3b7SMichal Simek } 826d53c3b7SMichal Simek 83973ea59eSMaarten Brock static const struct uartlite_reg_ops uartlite_be = { 846d53c3b7SMichal Simek .in = uartlite_inbe32, 856d53c3b7SMichal Simek .out = uartlite_outbe32, 866d53c3b7SMichal Simek }; 876d53c3b7SMichal Simek 886d53c3b7SMichal Simek static u32 uartlite_inle32(void __iomem *addr) 896d53c3b7SMichal Simek { 906d53c3b7SMichal Simek return ioread32(addr); 916d53c3b7SMichal Simek } 926d53c3b7SMichal Simek 936d53c3b7SMichal Simek static void uartlite_outle32(u32 val, void __iomem *addr) 946d53c3b7SMichal Simek { 956d53c3b7SMichal Simek iowrite32(val, addr); 966d53c3b7SMichal Simek } 976d53c3b7SMichal Simek 98973ea59eSMaarten Brock static const struct uartlite_reg_ops uartlite_le = { 996d53c3b7SMichal Simek .in = uartlite_inle32, 1006d53c3b7SMichal Simek .out = uartlite_outle32, 1016d53c3b7SMichal Simek }; 1026d53c3b7SMichal Simek 1036d53c3b7SMichal Simek static inline u32 uart_in32(u32 offset, struct uart_port *port) 1046d53c3b7SMichal Simek { 105da7bf20eSShubhrajyoti Datta struct uartlite_data *pdata = port->private_data; 1066d53c3b7SMichal Simek 107da7bf20eSShubhrajyoti Datta return pdata->reg_ops->in(port->membase + offset); 1086d53c3b7SMichal Simek } 1096d53c3b7SMichal Simek 1106d53c3b7SMichal Simek static inline void uart_out32(u32 val, u32 offset, struct uart_port *port) 1116d53c3b7SMichal Simek { 112da7bf20eSShubhrajyoti Datta struct uartlite_data *pdata = port->private_data; 1136d53c3b7SMichal Simek 114da7bf20eSShubhrajyoti Datta pdata->reg_ops->out(val, port->membase + offset); 1156d53c3b7SMichal Simek } 116ab4382d2SGreg Kroah-Hartman 117ab4382d2SGreg Kroah-Hartman static struct uart_port ulite_ports[ULITE_NR_UARTS]; 118ab4382d2SGreg Kroah-Hartman 119ab4382d2SGreg Kroah-Hartman /* --------------------------------------------------------------------- 120ab4382d2SGreg Kroah-Hartman * Core UART driver operations 121ab4382d2SGreg Kroah-Hartman */ 122ab4382d2SGreg Kroah-Hartman 123ab4382d2SGreg Kroah-Hartman static int ulite_receive(struct uart_port *port, int stat) 124ab4382d2SGreg Kroah-Hartman { 12592a19f9cSJiri Slaby struct tty_port *tport = &port->state->port; 126ab4382d2SGreg Kroah-Hartman unsigned char ch = 0; 127ab4382d2SGreg Kroah-Hartman char flag = TTY_NORMAL; 128ab4382d2SGreg Kroah-Hartman 129ab4382d2SGreg Kroah-Hartman if ((stat & (ULITE_STATUS_RXVALID | ULITE_STATUS_OVERRUN 130ab4382d2SGreg Kroah-Hartman | ULITE_STATUS_FRAME)) == 0) 131ab4382d2SGreg Kroah-Hartman return 0; 132ab4382d2SGreg Kroah-Hartman 133ab4382d2SGreg Kroah-Hartman /* stats */ 134ab4382d2SGreg Kroah-Hartman if (stat & ULITE_STATUS_RXVALID) { 135ab4382d2SGreg Kroah-Hartman port->icount.rx++; 1366d53c3b7SMichal Simek ch = uart_in32(ULITE_RX, port); 137ab4382d2SGreg Kroah-Hartman 138ab4382d2SGreg Kroah-Hartman if (stat & ULITE_STATUS_PARITY) 139ab4382d2SGreg Kroah-Hartman port->icount.parity++; 140ab4382d2SGreg Kroah-Hartman } 141ab4382d2SGreg Kroah-Hartman 142ab4382d2SGreg Kroah-Hartman if (stat & ULITE_STATUS_OVERRUN) 143ab4382d2SGreg Kroah-Hartman port->icount.overrun++; 144ab4382d2SGreg Kroah-Hartman 145ab4382d2SGreg Kroah-Hartman if (stat & ULITE_STATUS_FRAME) 146ab4382d2SGreg Kroah-Hartman port->icount.frame++; 147ab4382d2SGreg Kroah-Hartman 148ab4382d2SGreg Kroah-Hartman 149ab4382d2SGreg Kroah-Hartman /* drop byte with parity error if IGNPAR specificed */ 150ab4382d2SGreg Kroah-Hartman if (stat & port->ignore_status_mask & ULITE_STATUS_PARITY) 151ab4382d2SGreg Kroah-Hartman stat &= ~ULITE_STATUS_RXVALID; 152ab4382d2SGreg Kroah-Hartman 153ab4382d2SGreg Kroah-Hartman stat &= port->read_status_mask; 154ab4382d2SGreg Kroah-Hartman 155ab4382d2SGreg Kroah-Hartman if (stat & ULITE_STATUS_PARITY) 156ab4382d2SGreg Kroah-Hartman flag = TTY_PARITY; 157ab4382d2SGreg Kroah-Hartman 158ab4382d2SGreg Kroah-Hartman 159ab4382d2SGreg Kroah-Hartman stat &= ~port->ignore_status_mask; 160ab4382d2SGreg Kroah-Hartman 161ab4382d2SGreg Kroah-Hartman if (stat & ULITE_STATUS_RXVALID) 16292a19f9cSJiri Slaby tty_insert_flip_char(tport, ch, flag); 163ab4382d2SGreg Kroah-Hartman 164ab4382d2SGreg Kroah-Hartman if (stat & ULITE_STATUS_FRAME) 16592a19f9cSJiri Slaby tty_insert_flip_char(tport, 0, TTY_FRAME); 166ab4382d2SGreg Kroah-Hartman 167ab4382d2SGreg Kroah-Hartman if (stat & ULITE_STATUS_OVERRUN) 16892a19f9cSJiri Slaby tty_insert_flip_char(tport, 0, TTY_OVERRUN); 169ab4382d2SGreg Kroah-Hartman 170ab4382d2SGreg Kroah-Hartman return 1; 171ab4382d2SGreg Kroah-Hartman } 172ab4382d2SGreg Kroah-Hartman 173ab4382d2SGreg Kroah-Hartman static int ulite_transmit(struct uart_port *port, int stat) 174ab4382d2SGreg Kroah-Hartman { 175ab4382d2SGreg Kroah-Hartman struct circ_buf *xmit = &port->state->xmit; 176ab4382d2SGreg Kroah-Hartman 177ab4382d2SGreg Kroah-Hartman if (stat & ULITE_STATUS_TXFULL) 178ab4382d2SGreg Kroah-Hartman return 0; 179ab4382d2SGreg Kroah-Hartman 180ab4382d2SGreg Kroah-Hartman if (port->x_char) { 1816d53c3b7SMichal Simek uart_out32(port->x_char, ULITE_TX, port); 182ab4382d2SGreg Kroah-Hartman port->x_char = 0; 183ab4382d2SGreg Kroah-Hartman port->icount.tx++; 184ab4382d2SGreg Kroah-Hartman return 1; 185ab4382d2SGreg Kroah-Hartman } 186ab4382d2SGreg Kroah-Hartman 187ab4382d2SGreg Kroah-Hartman if (uart_circ_empty(xmit) || uart_tx_stopped(port)) 188ab4382d2SGreg Kroah-Hartman return 0; 189ab4382d2SGreg Kroah-Hartman 1906d53c3b7SMichal Simek uart_out32(xmit->buf[xmit->tail], ULITE_TX, port); 191ab4382d2SGreg Kroah-Hartman xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE-1); 192ab4382d2SGreg Kroah-Hartman port->icount.tx++; 193ab4382d2SGreg Kroah-Hartman 194ab4382d2SGreg Kroah-Hartman /* wake up */ 195ab4382d2SGreg Kroah-Hartman if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 196ab4382d2SGreg Kroah-Hartman uart_write_wakeup(port); 197ab4382d2SGreg Kroah-Hartman 198ab4382d2SGreg Kroah-Hartman return 1; 199ab4382d2SGreg Kroah-Hartman } 200ab4382d2SGreg Kroah-Hartman 201ab4382d2SGreg Kroah-Hartman static irqreturn_t ulite_isr(int irq, void *dev_id) 202ab4382d2SGreg Kroah-Hartman { 203ab4382d2SGreg Kroah-Hartman struct uart_port *port = dev_id; 20419606eafSMaarten Brock int stat, busy, n = 0; 2059e370d2cSRich Felker unsigned long flags; 206ab4382d2SGreg Kroah-Hartman 207ab4382d2SGreg Kroah-Hartman do { 20819606eafSMaarten Brock spin_lock_irqsave(&port->lock, flags); 20919606eafSMaarten Brock stat = uart_in32(ULITE_STATUS, port); 210ab4382d2SGreg Kroah-Hartman busy = ulite_receive(port, stat); 211ab4382d2SGreg Kroah-Hartman busy |= ulite_transmit(port, stat); 21219606eafSMaarten Brock spin_unlock_irqrestore(&port->lock, flags); 213ab4382d2SGreg Kroah-Hartman n++; 214ab4382d2SGreg Kroah-Hartman } while (busy); 215ab4382d2SGreg Kroah-Hartman 216ab4382d2SGreg Kroah-Hartman /* work done? */ 217ab4382d2SGreg Kroah-Hartman if (n > 1) { 2182e124b4aSJiri Slaby tty_flip_buffer_push(&port->state->port); 219ab4382d2SGreg Kroah-Hartman return IRQ_HANDLED; 220ab4382d2SGreg Kroah-Hartman } else { 221ab4382d2SGreg Kroah-Hartman return IRQ_NONE; 222ab4382d2SGreg Kroah-Hartman } 223ab4382d2SGreg Kroah-Hartman } 224ab4382d2SGreg Kroah-Hartman 225ab4382d2SGreg Kroah-Hartman static unsigned int ulite_tx_empty(struct uart_port *port) 226ab4382d2SGreg Kroah-Hartman { 227ab4382d2SGreg Kroah-Hartman unsigned long flags; 228ab4382d2SGreg Kroah-Hartman unsigned int ret; 229ab4382d2SGreg Kroah-Hartman 230ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 2316d53c3b7SMichal Simek ret = uart_in32(ULITE_STATUS, port); 232ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 233ab4382d2SGreg Kroah-Hartman 234ab4382d2SGreg Kroah-Hartman return ret & ULITE_STATUS_TXEMPTY ? TIOCSER_TEMT : 0; 235ab4382d2SGreg Kroah-Hartman } 236ab4382d2SGreg Kroah-Hartman 237ab4382d2SGreg Kroah-Hartman static unsigned int ulite_get_mctrl(struct uart_port *port) 238ab4382d2SGreg Kroah-Hartman { 239ab4382d2SGreg Kroah-Hartman return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; 240ab4382d2SGreg Kroah-Hartman } 241ab4382d2SGreg Kroah-Hartman 242ab4382d2SGreg Kroah-Hartman static void ulite_set_mctrl(struct uart_port *port, unsigned int mctrl) 243ab4382d2SGreg Kroah-Hartman { 244ab4382d2SGreg Kroah-Hartman /* N/A */ 245ab4382d2SGreg Kroah-Hartman } 246ab4382d2SGreg Kroah-Hartman 247ab4382d2SGreg Kroah-Hartman static void ulite_stop_tx(struct uart_port *port) 248ab4382d2SGreg Kroah-Hartman { 249ab4382d2SGreg Kroah-Hartman /* N/A */ 250ab4382d2SGreg Kroah-Hartman } 251ab4382d2SGreg Kroah-Hartman 252ab4382d2SGreg Kroah-Hartman static void ulite_start_tx(struct uart_port *port) 253ab4382d2SGreg Kroah-Hartman { 2546d53c3b7SMichal Simek ulite_transmit(port, uart_in32(ULITE_STATUS, port)); 255ab4382d2SGreg Kroah-Hartman } 256ab4382d2SGreg Kroah-Hartman 257ab4382d2SGreg Kroah-Hartman static void ulite_stop_rx(struct uart_port *port) 258ab4382d2SGreg Kroah-Hartman { 259ab4382d2SGreg Kroah-Hartman /* don't forward any more data (like !CREAD) */ 260ab4382d2SGreg Kroah-Hartman port->ignore_status_mask = ULITE_STATUS_RXVALID | ULITE_STATUS_PARITY 261ab4382d2SGreg Kroah-Hartman | ULITE_STATUS_FRAME | ULITE_STATUS_OVERRUN; 262ab4382d2SGreg Kroah-Hartman } 263ab4382d2SGreg Kroah-Hartman 264ab4382d2SGreg Kroah-Hartman static void ulite_break_ctl(struct uart_port *port, int ctl) 265ab4382d2SGreg Kroah-Hartman { 266ab4382d2SGreg Kroah-Hartman /* N/A */ 267ab4382d2SGreg Kroah-Hartman } 268ab4382d2SGreg Kroah-Hartman 269ab4382d2SGreg Kroah-Hartman static int ulite_startup(struct uart_port *port) 270ab4382d2SGreg Kroah-Hartman { 27114288befSShubhrajyoti Datta struct uartlite_data *pdata = port->private_data; 272ab4382d2SGreg Kroah-Hartman int ret; 273ab4382d2SGreg Kroah-Hartman 27414288befSShubhrajyoti Datta ret = clk_enable(pdata->clk); 27514288befSShubhrajyoti Datta if (ret) { 27614288befSShubhrajyoti Datta dev_err(port->dev, "Failed to enable clock\n"); 27714288befSShubhrajyoti Datta return ret; 27814288befSShubhrajyoti Datta } 27914288befSShubhrajyoti Datta 280106020ccSMaarten Brock ret = request_irq(port->irq, ulite_isr, IRQF_SHARED | IRQF_TRIGGER_RISING, 281106020ccSMaarten Brock "uartlite", port); 282ab4382d2SGreg Kroah-Hartman if (ret) 283ab4382d2SGreg Kroah-Hartman return ret; 284ab4382d2SGreg Kroah-Hartman 2856d53c3b7SMichal Simek uart_out32(ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX, 2866d53c3b7SMichal Simek ULITE_CONTROL, port); 2876d53c3b7SMichal Simek uart_out32(ULITE_CONTROL_IE, ULITE_CONTROL, port); 288ab4382d2SGreg Kroah-Hartman 289ab4382d2SGreg Kroah-Hartman return 0; 290ab4382d2SGreg Kroah-Hartman } 291ab4382d2SGreg Kroah-Hartman 292ab4382d2SGreg Kroah-Hartman static void ulite_shutdown(struct uart_port *port) 293ab4382d2SGreg Kroah-Hartman { 29414288befSShubhrajyoti Datta struct uartlite_data *pdata = port->private_data; 29514288befSShubhrajyoti Datta 2966d53c3b7SMichal Simek uart_out32(0, ULITE_CONTROL, port); 2976d53c3b7SMichal Simek uart_in32(ULITE_CONTROL, port); /* dummy */ 298ab4382d2SGreg Kroah-Hartman free_irq(port->irq, port); 29914288befSShubhrajyoti Datta clk_disable(pdata->clk); 300ab4382d2SGreg Kroah-Hartman } 301ab4382d2SGreg Kroah-Hartman 302ab4382d2SGreg Kroah-Hartman static void ulite_set_termios(struct uart_port *port, struct ktermios *termios, 303ab4382d2SGreg Kroah-Hartman struct ktermios *old) 304ab4382d2SGreg Kroah-Hartman { 305ab4382d2SGreg Kroah-Hartman unsigned long flags; 306ab4382d2SGreg Kroah-Hartman unsigned int baud; 307ab4382d2SGreg Kroah-Hartman 308ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 309ab4382d2SGreg Kroah-Hartman 310ab4382d2SGreg Kroah-Hartman port->read_status_mask = ULITE_STATUS_RXVALID | ULITE_STATUS_OVERRUN 311ab4382d2SGreg Kroah-Hartman | ULITE_STATUS_TXFULL; 312ab4382d2SGreg Kroah-Hartman 313ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & INPCK) 314ab4382d2SGreg Kroah-Hartman port->read_status_mask |= 315ab4382d2SGreg Kroah-Hartman ULITE_STATUS_PARITY | ULITE_STATUS_FRAME; 316ab4382d2SGreg Kroah-Hartman 317ab4382d2SGreg Kroah-Hartman port->ignore_status_mask = 0; 318ab4382d2SGreg Kroah-Hartman if (termios->c_iflag & IGNPAR) 319ab4382d2SGreg Kroah-Hartman port->ignore_status_mask |= ULITE_STATUS_PARITY 320ab4382d2SGreg Kroah-Hartman | ULITE_STATUS_FRAME | ULITE_STATUS_OVERRUN; 321ab4382d2SGreg Kroah-Hartman 322ab4382d2SGreg Kroah-Hartman /* ignore all characters if CREAD is not set */ 323ab4382d2SGreg Kroah-Hartman if ((termios->c_cflag & CREAD) == 0) 324ab4382d2SGreg Kroah-Hartman port->ignore_status_mask |= 325ab4382d2SGreg Kroah-Hartman ULITE_STATUS_RXVALID | ULITE_STATUS_PARITY 326ab4382d2SGreg Kroah-Hartman | ULITE_STATUS_FRAME | ULITE_STATUS_OVERRUN; 327ab4382d2SGreg Kroah-Hartman 328ab4382d2SGreg Kroah-Hartman /* update timeout */ 329ab4382d2SGreg Kroah-Hartman baud = uart_get_baud_rate(port, termios, old, 0, 460800); 330ab4382d2SGreg Kroah-Hartman uart_update_timeout(port, termios->c_cflag, baud); 331ab4382d2SGreg Kroah-Hartman 332ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 333ab4382d2SGreg Kroah-Hartman } 334ab4382d2SGreg Kroah-Hartman 335ab4382d2SGreg Kroah-Hartman static const char *ulite_type(struct uart_port *port) 336ab4382d2SGreg Kroah-Hartman { 337ab4382d2SGreg Kroah-Hartman return port->type == PORT_UARTLITE ? "uartlite" : NULL; 338ab4382d2SGreg Kroah-Hartman } 339ab4382d2SGreg Kroah-Hartman 340ab4382d2SGreg Kroah-Hartman static void ulite_release_port(struct uart_port *port) 341ab4382d2SGreg Kroah-Hartman { 342ab4382d2SGreg Kroah-Hartman release_mem_region(port->mapbase, ULITE_REGION); 343ab4382d2SGreg Kroah-Hartman iounmap(port->membase); 344ab4382d2SGreg Kroah-Hartman port->membase = NULL; 345ab4382d2SGreg Kroah-Hartman } 346ab4382d2SGreg Kroah-Hartman 347ab4382d2SGreg Kroah-Hartman static int ulite_request_port(struct uart_port *port) 348ab4382d2SGreg Kroah-Hartman { 349da7bf20eSShubhrajyoti Datta struct uartlite_data *pdata = port->private_data; 3506d53c3b7SMichal Simek int ret; 3516d53c3b7SMichal Simek 352ab4382d2SGreg Kroah-Hartman pr_debug("ulite console: port=%p; port->mapbase=%llx\n", 353ab4382d2SGreg Kroah-Hartman port, (unsigned long long) port->mapbase); 354ab4382d2SGreg Kroah-Hartman 355ab4382d2SGreg Kroah-Hartman if (!request_mem_region(port->mapbase, ULITE_REGION, "uartlite")) { 356ab4382d2SGreg Kroah-Hartman dev_err(port->dev, "Memory region busy\n"); 357ab4382d2SGreg Kroah-Hartman return -EBUSY; 358ab4382d2SGreg Kroah-Hartman } 359ab4382d2SGreg Kroah-Hartman 360ab4382d2SGreg Kroah-Hartman port->membase = ioremap(port->mapbase, ULITE_REGION); 361ab4382d2SGreg Kroah-Hartman if (!port->membase) { 362ab4382d2SGreg Kroah-Hartman dev_err(port->dev, "Unable to map registers\n"); 363ab4382d2SGreg Kroah-Hartman release_mem_region(port->mapbase, ULITE_REGION); 364ab4382d2SGreg Kroah-Hartman return -EBUSY; 365ab4382d2SGreg Kroah-Hartman } 366ab4382d2SGreg Kroah-Hartman 367da7bf20eSShubhrajyoti Datta pdata->reg_ops = &uartlite_be; 3686d53c3b7SMichal Simek ret = uart_in32(ULITE_CONTROL, port); 3696d53c3b7SMichal Simek uart_out32(ULITE_CONTROL_RST_TX, ULITE_CONTROL, port); 3706d53c3b7SMichal Simek ret = uart_in32(ULITE_STATUS, port); 3716d53c3b7SMichal Simek /* Endianess detection */ 3726d53c3b7SMichal Simek if ((ret & ULITE_STATUS_TXEMPTY) != ULITE_STATUS_TXEMPTY) 373da7bf20eSShubhrajyoti Datta pdata->reg_ops = &uartlite_le; 3746d53c3b7SMichal Simek 375ab4382d2SGreg Kroah-Hartman return 0; 376ab4382d2SGreg Kroah-Hartman } 377ab4382d2SGreg Kroah-Hartman 378ab4382d2SGreg Kroah-Hartman static void ulite_config_port(struct uart_port *port, int flags) 379ab4382d2SGreg Kroah-Hartman { 380ab4382d2SGreg Kroah-Hartman if (!ulite_request_port(port)) 381ab4382d2SGreg Kroah-Hartman port->type = PORT_UARTLITE; 382ab4382d2SGreg Kroah-Hartman } 383ab4382d2SGreg Kroah-Hartman 384ab4382d2SGreg Kroah-Hartman static int ulite_verify_port(struct uart_port *port, struct serial_struct *ser) 385ab4382d2SGreg Kroah-Hartman { 386ab4382d2SGreg Kroah-Hartman /* we don't want the core code to modify any port params */ 387ab4382d2SGreg Kroah-Hartman return -EINVAL; 388ab4382d2SGreg Kroah-Hartman } 389ab4382d2SGreg Kroah-Hartman 39014288befSShubhrajyoti Datta static void ulite_pm(struct uart_port *port, unsigned int state, 39114288befSShubhrajyoti Datta unsigned int oldstate) 39214288befSShubhrajyoti Datta { 39307e5d4ffSGreg Kroah-Hartman struct uartlite_data *pdata = port->private_data; 39407e5d4ffSGreg Kroah-Hartman 39507e5d4ffSGreg Kroah-Hartman if (!state) 39607e5d4ffSGreg Kroah-Hartman clk_enable(pdata->clk); 39707e5d4ffSGreg Kroah-Hartman else 39807e5d4ffSGreg Kroah-Hartman clk_disable(pdata->clk); 39914288befSShubhrajyoti Datta } 40014288befSShubhrajyoti Datta 401ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 402ab4382d2SGreg Kroah-Hartman static int ulite_get_poll_char(struct uart_port *port) 403ab4382d2SGreg Kroah-Hartman { 4046d53c3b7SMichal Simek if (!(uart_in32(ULITE_STATUS, port) & ULITE_STATUS_RXVALID)) 405ab4382d2SGreg Kroah-Hartman return NO_POLL_CHAR; 406ab4382d2SGreg Kroah-Hartman 4076d53c3b7SMichal Simek return uart_in32(ULITE_RX, port); 408ab4382d2SGreg Kroah-Hartman } 409ab4382d2SGreg Kroah-Hartman 410ab4382d2SGreg Kroah-Hartman static void ulite_put_poll_char(struct uart_port *port, unsigned char ch) 411ab4382d2SGreg Kroah-Hartman { 4126d53c3b7SMichal Simek while (uart_in32(ULITE_STATUS, port) & ULITE_STATUS_TXFULL) 413ab4382d2SGreg Kroah-Hartman cpu_relax(); 414ab4382d2SGreg Kroah-Hartman 415ab4382d2SGreg Kroah-Hartman /* write char to device */ 4166d53c3b7SMichal Simek uart_out32(ch, ULITE_TX, port); 417ab4382d2SGreg Kroah-Hartman } 418ab4382d2SGreg Kroah-Hartman #endif 419ab4382d2SGreg Kroah-Hartman 42031d054dcSJulia Lawall static const struct uart_ops ulite_ops = { 421ab4382d2SGreg Kroah-Hartman .tx_empty = ulite_tx_empty, 422ab4382d2SGreg Kroah-Hartman .set_mctrl = ulite_set_mctrl, 423ab4382d2SGreg Kroah-Hartman .get_mctrl = ulite_get_mctrl, 424ab4382d2SGreg Kroah-Hartman .stop_tx = ulite_stop_tx, 425ab4382d2SGreg Kroah-Hartman .start_tx = ulite_start_tx, 426ab4382d2SGreg Kroah-Hartman .stop_rx = ulite_stop_rx, 427ab4382d2SGreg Kroah-Hartman .break_ctl = ulite_break_ctl, 428ab4382d2SGreg Kroah-Hartman .startup = ulite_startup, 429ab4382d2SGreg Kroah-Hartman .shutdown = ulite_shutdown, 430ab4382d2SGreg Kroah-Hartman .set_termios = ulite_set_termios, 431ab4382d2SGreg Kroah-Hartman .type = ulite_type, 432ab4382d2SGreg Kroah-Hartman .release_port = ulite_release_port, 433ab4382d2SGreg Kroah-Hartman .request_port = ulite_request_port, 434ab4382d2SGreg Kroah-Hartman .config_port = ulite_config_port, 435ab4382d2SGreg Kroah-Hartman .verify_port = ulite_verify_port, 43614288befSShubhrajyoti Datta .pm = ulite_pm, 437ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 438ab4382d2SGreg Kroah-Hartman .poll_get_char = ulite_get_poll_char, 439ab4382d2SGreg Kroah-Hartman .poll_put_char = ulite_put_poll_char, 440ab4382d2SGreg Kroah-Hartman #endif 441ab4382d2SGreg Kroah-Hartman }; 442ab4382d2SGreg Kroah-Hartman 443ab4382d2SGreg Kroah-Hartman /* --------------------------------------------------------------------- 444ab4382d2SGreg Kroah-Hartman * Console driver operations 445ab4382d2SGreg Kroah-Hartman */ 446ab4382d2SGreg Kroah-Hartman 447ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_SERIAL_UARTLITE_CONSOLE 448ab4382d2SGreg Kroah-Hartman static void ulite_console_wait_tx(struct uart_port *port) 449ab4382d2SGreg Kroah-Hartman { 450ab4382d2SGreg Kroah-Hartman u8 val; 451d3352154SMichal Simek unsigned long timeout; 452ab4382d2SGreg Kroah-Hartman 453d3352154SMichal Simek /* 454d3352154SMichal Simek * Spin waiting for TX fifo to have space available. 455d3352154SMichal Simek * When using the Microblaze Debug Module this can take up to 1s 456d3352154SMichal Simek */ 457d3352154SMichal Simek timeout = jiffies + msecs_to_jiffies(1000); 458d3352154SMichal Simek while (1) { 4596d53c3b7SMichal Simek val = uart_in32(ULITE_STATUS, port); 460ab4382d2SGreg Kroah-Hartman if ((val & ULITE_STATUS_TXFULL) == 0) 461ab4382d2SGreg Kroah-Hartman break; 462d3352154SMichal Simek if (time_after(jiffies, timeout)) { 463d3352154SMichal Simek dev_warn(port->dev, 464d3352154SMichal Simek "timeout waiting for TX buffer empty\n"); 465d3352154SMichal Simek break; 466d3352154SMichal Simek } 467ab4382d2SGreg Kroah-Hartman cpu_relax(); 468ab4382d2SGreg Kroah-Hartman } 469ab4382d2SGreg Kroah-Hartman } 470ab4382d2SGreg Kroah-Hartman 471ab4382d2SGreg Kroah-Hartman static void ulite_console_putchar(struct uart_port *port, int ch) 472ab4382d2SGreg Kroah-Hartman { 473ab4382d2SGreg Kroah-Hartman ulite_console_wait_tx(port); 4746d53c3b7SMichal Simek uart_out32(ch, ULITE_TX, port); 475ab4382d2SGreg Kroah-Hartman } 476ab4382d2SGreg Kroah-Hartman 477ab4382d2SGreg Kroah-Hartman static void ulite_console_write(struct console *co, const char *s, 478ab4382d2SGreg Kroah-Hartman unsigned int count) 479ab4382d2SGreg Kroah-Hartman { 480deeb33e8SShubhrajyoti Datta struct uart_port *port = console_port; 481ab4382d2SGreg Kroah-Hartman unsigned long flags; 482ab4382d2SGreg Kroah-Hartman unsigned int ier; 483ab4382d2SGreg Kroah-Hartman int locked = 1; 484ab4382d2SGreg Kroah-Hartman 485ab4382d2SGreg Kroah-Hartman if (oops_in_progress) { 486ab4382d2SGreg Kroah-Hartman locked = spin_trylock_irqsave(&port->lock, flags); 487ab4382d2SGreg Kroah-Hartman } else 488ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 489ab4382d2SGreg Kroah-Hartman 490ab4382d2SGreg Kroah-Hartman /* save and disable interrupt */ 4916d53c3b7SMichal Simek ier = uart_in32(ULITE_STATUS, port) & ULITE_STATUS_IE; 4926d53c3b7SMichal Simek uart_out32(0, ULITE_CONTROL, port); 493ab4382d2SGreg Kroah-Hartman 494ab4382d2SGreg Kroah-Hartman uart_console_write(port, s, count, ulite_console_putchar); 495ab4382d2SGreg Kroah-Hartman 496ab4382d2SGreg Kroah-Hartman ulite_console_wait_tx(port); 497ab4382d2SGreg Kroah-Hartman 498ab4382d2SGreg Kroah-Hartman /* restore interrupt state */ 499ab4382d2SGreg Kroah-Hartman if (ier) 5006d53c3b7SMichal Simek uart_out32(ULITE_CONTROL_IE, ULITE_CONTROL, port); 501ab4382d2SGreg Kroah-Hartman 502ab4382d2SGreg Kroah-Hartman if (locked) 503ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 504ab4382d2SGreg Kroah-Hartman } 505ab4382d2SGreg Kroah-Hartman 5069671f099SBill Pemberton static int ulite_console_setup(struct console *co, char *options) 507ab4382d2SGreg Kroah-Hartman { 508ab4382d2SGreg Kroah-Hartman struct uart_port *port; 509ab4382d2SGreg Kroah-Hartman int baud = 9600; 510ab4382d2SGreg Kroah-Hartman int bits = 8; 511ab4382d2SGreg Kroah-Hartman int parity = 'n'; 512ab4382d2SGreg Kroah-Hartman int flow = 'n'; 513ab4382d2SGreg Kroah-Hartman 514ab4382d2SGreg Kroah-Hartman 515deeb33e8SShubhrajyoti Datta port = console_port; 516ab4382d2SGreg Kroah-Hartman 517ab4382d2SGreg Kroah-Hartman /* Has the device been initialized yet? */ 518ab4382d2SGreg Kroah-Hartman if (!port->mapbase) { 519ab4382d2SGreg Kroah-Hartman pr_debug("console on ttyUL%i not present\n", co->index); 520ab4382d2SGreg Kroah-Hartman return -ENODEV; 521ab4382d2SGreg Kroah-Hartman } 522ab4382d2SGreg Kroah-Hartman 523ab4382d2SGreg Kroah-Hartman /* not initialized yet? */ 524ab4382d2SGreg Kroah-Hartman if (!port->membase) { 525ab4382d2SGreg Kroah-Hartman if (ulite_request_port(port)) 526ab4382d2SGreg Kroah-Hartman return -ENODEV; 527ab4382d2SGreg Kroah-Hartman } 528ab4382d2SGreg Kroah-Hartman 529ab4382d2SGreg Kroah-Hartman if (options) 530ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 531ab4382d2SGreg Kroah-Hartman 532ab4382d2SGreg Kroah-Hartman return uart_set_options(port, co, baud, parity, bits, flow); 533ab4382d2SGreg Kroah-Hartman } 534ab4382d2SGreg Kroah-Hartman 535ab4382d2SGreg Kroah-Hartman static struct uart_driver ulite_uart_driver; 536ab4382d2SGreg Kroah-Hartman 537ab4382d2SGreg Kroah-Hartman static struct console ulite_console = { 538ab4382d2SGreg Kroah-Hartman .name = ULITE_NAME, 539ab4382d2SGreg Kroah-Hartman .write = ulite_console_write, 540ab4382d2SGreg Kroah-Hartman .device = uart_console_device, 541ab4382d2SGreg Kroah-Hartman .setup = ulite_console_setup, 542ab4382d2SGreg Kroah-Hartman .flags = CON_PRINTBUFFER, 543ab4382d2SGreg Kroah-Hartman .index = -1, /* Specified on the cmdline (e.g. console=ttyUL0 ) */ 544ab4382d2SGreg Kroah-Hartman .data = &ulite_uart_driver, 545ab4382d2SGreg Kroah-Hartman }; 546ab4382d2SGreg Kroah-Hartman 5477cdcc29eSRich Felker static void early_uartlite_putc(struct uart_port *port, int c) 5487cdcc29eSRich Felker { 5497cdcc29eSRich Felker /* 5507cdcc29eSRich Felker * Limit how many times we'll spin waiting for TX FIFO status. 5517cdcc29eSRich Felker * This will prevent lockups if the base address is incorrectly 5527cdcc29eSRich Felker * set, or any other issue on the UARTLITE. 5537cdcc29eSRich Felker * This limit is pretty arbitrary, unless we are at about 10 baud 5547cdcc29eSRich Felker * we'll never timeout on a working UART. 5557cdcc29eSRich Felker */ 5567cdcc29eSRich Felker 5577cdcc29eSRich Felker unsigned retries = 1000000; 5587cdcc29eSRich Felker /* read status bit - 0x8 offset */ 5597cdcc29eSRich Felker while (--retries && (readl(port->membase + 8) & (1 << 3))) 5607cdcc29eSRich Felker ; 5617cdcc29eSRich Felker 5627cdcc29eSRich Felker /* Only attempt the iowrite if we didn't timeout */ 5637cdcc29eSRich Felker /* write to TX_FIFO - 0x4 offset */ 5647cdcc29eSRich Felker if (retries) 5657cdcc29eSRich Felker writel(c & 0xff, port->membase + 4); 5667cdcc29eSRich Felker } 5677cdcc29eSRich Felker 5687cdcc29eSRich Felker static void early_uartlite_write(struct console *console, 5697cdcc29eSRich Felker const char *s, unsigned n) 5707cdcc29eSRich Felker { 5717cdcc29eSRich Felker struct earlycon_device *device = console->data; 5727cdcc29eSRich Felker uart_console_write(&device->port, s, n, early_uartlite_putc); 5737cdcc29eSRich Felker } 5747cdcc29eSRich Felker 5757cdcc29eSRich Felker static int __init early_uartlite_setup(struct earlycon_device *device, 5767cdcc29eSRich Felker const char *options) 5777cdcc29eSRich Felker { 5787cdcc29eSRich Felker if (!device->port.membase) 5797cdcc29eSRich Felker return -ENODEV; 5807cdcc29eSRich Felker 5817cdcc29eSRich Felker device->con->write = early_uartlite_write; 5827cdcc29eSRich Felker return 0; 5837cdcc29eSRich Felker } 5847cdcc29eSRich Felker EARLYCON_DECLARE(uartlite, early_uartlite_setup); 5857cdcc29eSRich Felker OF_EARLYCON_DECLARE(uartlite_b, "xlnx,opb-uartlite-1.00.b", early_uartlite_setup); 5867cdcc29eSRich Felker OF_EARLYCON_DECLARE(uartlite_a, "xlnx,xps-uartlite-1.00.a", early_uartlite_setup); 5877cdcc29eSRich Felker 588ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_SERIAL_UARTLITE_CONSOLE */ 589ab4382d2SGreg Kroah-Hartman 590ab4382d2SGreg Kroah-Hartman static struct uart_driver ulite_uart_driver = { 591ab4382d2SGreg Kroah-Hartman .owner = THIS_MODULE, 592ab4382d2SGreg Kroah-Hartman .driver_name = "uartlite", 593ab4382d2SGreg Kroah-Hartman .dev_name = ULITE_NAME, 594ab4382d2SGreg Kroah-Hartman .major = ULITE_MAJOR, 595ab4382d2SGreg Kroah-Hartman .minor = ULITE_MINOR, 596ab4382d2SGreg Kroah-Hartman .nr = ULITE_NR_UARTS, 597ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_SERIAL_UARTLITE_CONSOLE 598ab4382d2SGreg Kroah-Hartman .cons = &ulite_console, 599ab4382d2SGreg Kroah-Hartman #endif 600ab4382d2SGreg Kroah-Hartman }; 601ab4382d2SGreg Kroah-Hartman 602ab4382d2SGreg Kroah-Hartman /* --------------------------------------------------------------------- 603ab4382d2SGreg Kroah-Hartman * Port assignment functions (mapping devices to uart_port structures) 604ab4382d2SGreg Kroah-Hartman */ 605ab4382d2SGreg Kroah-Hartman 606ab4382d2SGreg Kroah-Hartman /** ulite_assign: register a uartlite device with the driver 607ab4382d2SGreg Kroah-Hartman * 608ab4382d2SGreg Kroah-Hartman * @dev: pointer to device structure 609ab4382d2SGreg Kroah-Hartman * @id: requested id number. Pass -1 for automatic port assignment 610ab4382d2SGreg Kroah-Hartman * @base: base address of uartlite registers 611ab4382d2SGreg Kroah-Hartman * @irq: irq number for uartlite 612da7bf20eSShubhrajyoti Datta * @pdata: private data for uartlite 613ab4382d2SGreg Kroah-Hartman * 614ab4382d2SGreg Kroah-Hartman * Returns: 0 on success, <0 otherwise 615ab4382d2SGreg Kroah-Hartman */ 616da7bf20eSShubhrajyoti Datta static int ulite_assign(struct device *dev, int id, u32 base, int irq, 617da7bf20eSShubhrajyoti Datta struct uartlite_data *pdata) 618ab4382d2SGreg Kroah-Hartman { 619ab4382d2SGreg Kroah-Hartman struct uart_port *port; 620ab4382d2SGreg Kroah-Hartman int rc; 621ab4382d2SGreg Kroah-Hartman 622ab4382d2SGreg Kroah-Hartman /* if id = -1; then scan for a free id and use that */ 623ab4382d2SGreg Kroah-Hartman if (id < 0) { 624ab4382d2SGreg Kroah-Hartman for (id = 0; id < ULITE_NR_UARTS; id++) 625ab4382d2SGreg Kroah-Hartman if (ulite_ports[id].mapbase == 0) 626ab4382d2SGreg Kroah-Hartman break; 627ab4382d2SGreg Kroah-Hartman } 628ab4382d2SGreg Kroah-Hartman if (id < 0 || id >= ULITE_NR_UARTS) { 629ab4382d2SGreg Kroah-Hartman dev_err(dev, "%s%i too large\n", ULITE_NAME, id); 630ab4382d2SGreg Kroah-Hartman return -EINVAL; 631ab4382d2SGreg Kroah-Hartman } 632ab4382d2SGreg Kroah-Hartman 633ab4382d2SGreg Kroah-Hartman if ((ulite_ports[id].mapbase) && (ulite_ports[id].mapbase != base)) { 634ab4382d2SGreg Kroah-Hartman dev_err(dev, "cannot assign to %s%i; it is already in use\n", 635ab4382d2SGreg Kroah-Hartman ULITE_NAME, id); 636ab4382d2SGreg Kroah-Hartman return -EBUSY; 637ab4382d2SGreg Kroah-Hartman } 638ab4382d2SGreg Kroah-Hartman 639ab4382d2SGreg Kroah-Hartman port = &ulite_ports[id]; 640ab4382d2SGreg Kroah-Hartman 641ab4382d2SGreg Kroah-Hartman spin_lock_init(&port->lock); 642ab4382d2SGreg Kroah-Hartman port->fifosize = 16; 643ab4382d2SGreg Kroah-Hartman port->regshift = 2; 644ab4382d2SGreg Kroah-Hartman port->iotype = UPIO_MEM; 645ab4382d2SGreg Kroah-Hartman port->iobase = 1; /* mark port in use */ 646ab4382d2SGreg Kroah-Hartman port->mapbase = base; 647ab4382d2SGreg Kroah-Hartman port->membase = NULL; 648ab4382d2SGreg Kroah-Hartman port->ops = &ulite_ops; 649ab4382d2SGreg Kroah-Hartman port->irq = irq; 650ab4382d2SGreg Kroah-Hartman port->flags = UPF_BOOT_AUTOCONF; 651ab4382d2SGreg Kroah-Hartman port->dev = dev; 652ab4382d2SGreg Kroah-Hartman port->type = PORT_UNKNOWN; 653ab4382d2SGreg Kroah-Hartman port->line = id; 654da7bf20eSShubhrajyoti Datta port->private_data = pdata; 655ab4382d2SGreg Kroah-Hartman 656ab4382d2SGreg Kroah-Hartman dev_set_drvdata(dev, port); 657ab4382d2SGreg Kroah-Hartman 658deeb33e8SShubhrajyoti Datta #ifdef CONFIG_SERIAL_UARTLITE_CONSOLE 659deeb33e8SShubhrajyoti Datta /* 660deeb33e8SShubhrajyoti Datta * If console hasn't been found yet try to assign this port 661deeb33e8SShubhrajyoti Datta * because it is required to be assigned for console setup function. 662deeb33e8SShubhrajyoti Datta * If register_console() don't assign value, then console_port pointer 663deeb33e8SShubhrajyoti Datta * is cleanup. 664deeb33e8SShubhrajyoti Datta */ 6655042ffbcSGreg Kroah-Hartman if (ulite_uart_driver.cons->index == -1) 666deeb33e8SShubhrajyoti Datta console_port = port; 667deeb33e8SShubhrajyoti Datta #endif 668deeb33e8SShubhrajyoti Datta 669ab4382d2SGreg Kroah-Hartman /* Register the port */ 67061ad2a02SGreg Kroah-Hartman rc = uart_add_one_port(&ulite_uart_driver, port); 671ab4382d2SGreg Kroah-Hartman if (rc) { 672ab4382d2SGreg Kroah-Hartman dev_err(dev, "uart_add_one_port() failed; err=%i\n", rc); 673ab4382d2SGreg Kroah-Hartman port->mapbase = 0; 674ab4382d2SGreg Kroah-Hartman dev_set_drvdata(dev, NULL); 675ab4382d2SGreg Kroah-Hartman return rc; 676ab4382d2SGreg Kroah-Hartman } 677ab4382d2SGreg Kroah-Hartman 678deeb33e8SShubhrajyoti Datta #ifdef CONFIG_SERIAL_UARTLITE_CONSOLE 679deeb33e8SShubhrajyoti Datta /* This is not port which is used for console that's why clean it up */ 6805042ffbcSGreg Kroah-Hartman if (ulite_uart_driver.cons->index == -1) 681deeb33e8SShubhrajyoti Datta console_port = NULL; 682deeb33e8SShubhrajyoti Datta #endif 683deeb33e8SShubhrajyoti Datta 684ab4382d2SGreg Kroah-Hartman return 0; 685ab4382d2SGreg Kroah-Hartman } 686ab4382d2SGreg Kroah-Hartman 687ab4382d2SGreg Kroah-Hartman /** ulite_release: register a uartlite device with the driver 688ab4382d2SGreg Kroah-Hartman * 689ab4382d2SGreg Kroah-Hartman * @dev: pointer to device structure 690ab4382d2SGreg Kroah-Hartman */ 691ae8d8a14SBill Pemberton static int ulite_release(struct device *dev) 692ab4382d2SGreg Kroah-Hartman { 693ab4382d2SGreg Kroah-Hartman struct uart_port *port = dev_get_drvdata(dev); 694ab4382d2SGreg Kroah-Hartman int rc = 0; 695ab4382d2SGreg Kroah-Hartman 696ab4382d2SGreg Kroah-Hartman if (port) { 6975d8508aaSGreg Kroah-Hartman rc = uart_remove_one_port(&ulite_uart_driver, port); 698ab4382d2SGreg Kroah-Hartman dev_set_drvdata(dev, NULL); 699ab4382d2SGreg Kroah-Hartman port->mapbase = 0; 700ab4382d2SGreg Kroah-Hartman } 701ab4382d2SGreg Kroah-Hartman 702ab4382d2SGreg Kroah-Hartman return rc; 703ab4382d2SGreg Kroah-Hartman } 704ab4382d2SGreg Kroah-Hartman 705a3a10614SShubhrajyoti Datta /** 706a3a10614SShubhrajyoti Datta * ulite_suspend - Stop the device. 707a3a10614SShubhrajyoti Datta * 708a3a10614SShubhrajyoti Datta * @dev: handle to the device structure. 709a3a10614SShubhrajyoti Datta * Return: 0 always. 710a3a10614SShubhrajyoti Datta */ 711a3a10614SShubhrajyoti Datta static int __maybe_unused ulite_suspend(struct device *dev) 712a3a10614SShubhrajyoti Datta { 713a3a10614SShubhrajyoti Datta struct uart_port *port = dev_get_drvdata(dev); 714ee0a29baSColin Ian King 7155d8508aaSGreg Kroah-Hartman if (port) 7165d8508aaSGreg Kroah-Hartman uart_suspend_port(&ulite_uart_driver, port); 717a3a10614SShubhrajyoti Datta 718a3a10614SShubhrajyoti Datta return 0; 719a3a10614SShubhrajyoti Datta } 720a3a10614SShubhrajyoti Datta 721a3a10614SShubhrajyoti Datta /** 722a3a10614SShubhrajyoti Datta * ulite_resume - Resume the device. 723a3a10614SShubhrajyoti Datta * 724a3a10614SShubhrajyoti Datta * @dev: handle to the device structure. 725a3a10614SShubhrajyoti Datta * Return: 0 on success, errno otherwise. 726a3a10614SShubhrajyoti Datta */ 727a3a10614SShubhrajyoti Datta static int __maybe_unused ulite_resume(struct device *dev) 728a3a10614SShubhrajyoti Datta { 729a3a10614SShubhrajyoti Datta struct uart_port *port = dev_get_drvdata(dev); 730ee0a29baSColin Ian King 7315d8508aaSGreg Kroah-Hartman if (port) 7325d8508aaSGreg Kroah-Hartman uart_resume_port(&ulite_uart_driver, port); 733a3a10614SShubhrajyoti Datta 734a3a10614SShubhrajyoti Datta return 0; 735a3a10614SShubhrajyoti Datta } 736a3a10614SShubhrajyoti Datta 737ab4382d2SGreg Kroah-Hartman /* --------------------------------------------------------------------- 738ab4382d2SGreg Kroah-Hartman * Platform bus binding 739ab4382d2SGreg Kroah-Hartman */ 740a3a10614SShubhrajyoti Datta 74107e5d4ffSGreg Kroah-Hartman static SIMPLE_DEV_PM_OPS(ulite_pm_ops, ulite_suspend, ulite_resume); 742a3a10614SShubhrajyoti Datta 743e5263a51SGrant Likely #if defined(CONFIG_OF) 744e5263a51SGrant Likely /* Match table for of_platform binding */ 745ed0bb232SFabian Frederick static const struct of_device_id ulite_of_match[] = { 746e5263a51SGrant Likely { .compatible = "xlnx,opb-uartlite-1.00.b", }, 747e5263a51SGrant Likely { .compatible = "xlnx,xps-uartlite-1.00.a", }, 748e5263a51SGrant Likely {} 749e5263a51SGrant Likely }; 750e5263a51SGrant Likely MODULE_DEVICE_TABLE(of, ulite_of_match); 751e5263a51SGrant Likely #endif /* CONFIG_OF */ 752e5263a51SGrant Likely 7539671f099SBill Pemberton static int ulite_probe(struct platform_device *pdev) 754ab4382d2SGreg Kroah-Hartman { 7555c90c07bSMichal Simek struct resource *res; 756da7bf20eSShubhrajyoti Datta struct uartlite_data *pdata; 75714288befSShubhrajyoti Datta int irq, ret; 758e5263a51SGrant Likely int id = pdev->id; 759e5263a51SGrant Likely #ifdef CONFIG_OF 760e5263a51SGrant Likely const __be32 *prop; 761e5263a51SGrant Likely 762e5263a51SGrant Likely prop = of_get_property(pdev->dev.of_node, "port-number", NULL); 763e5263a51SGrant Likely if (prop) 764e5263a51SGrant Likely id = be32_to_cpup(prop); 765e5263a51SGrant Likely #endif 766da7bf20eSShubhrajyoti Datta pdata = devm_kzalloc(&pdev->dev, sizeof(struct uartlite_data), 767da7bf20eSShubhrajyoti Datta GFP_KERNEL); 768da7bf20eSShubhrajyoti Datta if (!pdata) 769da7bf20eSShubhrajyoti Datta return -ENOMEM; 770ab4382d2SGreg Kroah-Hartman 771ab4382d2SGreg Kroah-Hartman res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 772ab4382d2SGreg Kroah-Hartman if (!res) 773ab4382d2SGreg Kroah-Hartman return -ENODEV; 774ab4382d2SGreg Kroah-Hartman 7755c90c07bSMichal Simek irq = platform_get_irq(pdev, 0); 776*0b60525bSAlexander Sverdlin if (irq < 0) 777*0b60525bSAlexander Sverdlin return irq; 778ab4382d2SGreg Kroah-Hartman 77914288befSShubhrajyoti Datta pdata->clk = devm_clk_get(&pdev->dev, "s_axi_aclk"); 78014288befSShubhrajyoti Datta if (IS_ERR(pdata->clk)) { 78114288befSShubhrajyoti Datta if (PTR_ERR(pdata->clk) != -ENOENT) 78214288befSShubhrajyoti Datta return PTR_ERR(pdata->clk); 78314288befSShubhrajyoti Datta 78414288befSShubhrajyoti Datta /* 78514288befSShubhrajyoti Datta * Clock framework support is optional, continue on 78614288befSShubhrajyoti Datta * anyways if we don't find a matching clock. 78714288befSShubhrajyoti Datta */ 78814288befSShubhrajyoti Datta pdata->clk = NULL; 78914288befSShubhrajyoti Datta } 79014288befSShubhrajyoti Datta 791ea42d7a6SShubhrajyoti Datta ret = clk_prepare_enable(pdata->clk); 79214288befSShubhrajyoti Datta if (ret) { 79314288befSShubhrajyoti Datta dev_err(&pdev->dev, "Failed to prepare clock\n"); 79414288befSShubhrajyoti Datta return ret; 79514288befSShubhrajyoti Datta } 79614288befSShubhrajyoti Datta 797f4c47547SGreg Kroah-Hartman if (!ulite_uart_driver.state) { 798f4c47547SGreg Kroah-Hartman dev_dbg(&pdev->dev, "uartlite: calling uart_register_driver()\n"); 799f4c47547SGreg Kroah-Hartman ret = uart_register_driver(&ulite_uart_driver); 800f4c47547SGreg Kroah-Hartman if (ret < 0) { 801f4c47547SGreg Kroah-Hartman dev_err(&pdev->dev, "Failed to register driver\n"); 802f4c47547SGreg Kroah-Hartman return ret; 803f4c47547SGreg Kroah-Hartman } 804f4c47547SGreg Kroah-Hartman } 805f4c47547SGreg Kroah-Hartman 806ea42d7a6SShubhrajyoti Datta ret = ulite_assign(&pdev->dev, id, res->start, irq, pdata); 807ea42d7a6SShubhrajyoti Datta 80807e5d4ffSGreg Kroah-Hartman clk_disable(pdata->clk); 809ea42d7a6SShubhrajyoti Datta 810ea42d7a6SShubhrajyoti Datta return ret; 811ab4382d2SGreg Kroah-Hartman } 812ab4382d2SGreg Kroah-Hartman 813ae8d8a14SBill Pemberton static int ulite_remove(struct platform_device *pdev) 814ab4382d2SGreg Kroah-Hartman { 81514288befSShubhrajyoti Datta struct uart_port *port = dev_get_drvdata(&pdev->dev); 81614288befSShubhrajyoti Datta struct uartlite_data *pdata = port->private_data; 81714288befSShubhrajyoti Datta 8186a7ce07dSChuhong Yuan clk_disable_unprepare(pdata->clk); 81907e5d4ffSGreg Kroah-Hartman return ulite_release(&pdev->dev); 820ab4382d2SGreg Kroah-Hartman } 821ab4382d2SGreg Kroah-Hartman 822ab4382d2SGreg Kroah-Hartman /* work with hotplug and coldplug */ 823ab4382d2SGreg Kroah-Hartman MODULE_ALIAS("platform:uartlite"); 824ab4382d2SGreg Kroah-Hartman 825ab4382d2SGreg Kroah-Hartman static struct platform_driver ulite_platform_driver = { 826ab4382d2SGreg Kroah-Hartman .probe = ulite_probe, 8272d47b716SBill Pemberton .remove = ulite_remove, 828ab4382d2SGreg Kroah-Hartman .driver = { 829ab4382d2SGreg Kroah-Hartman .name = "uartlite", 83085888069SBen Dooks .of_match_table = of_match_ptr(ulite_of_match), 831a3a10614SShubhrajyoti Datta .pm = &ulite_pm_ops, 832ab4382d2SGreg Kroah-Hartman }, 833ab4382d2SGreg Kroah-Hartman }; 834ab4382d2SGreg Kroah-Hartman 835ab4382d2SGreg Kroah-Hartman /* --------------------------------------------------------------------- 836ab4382d2SGreg Kroah-Hartman * Module setup/teardown 837ab4382d2SGreg Kroah-Hartman */ 838ab4382d2SGreg Kroah-Hartman 8393240b48dSMichal Simek static int __init ulite_init(void) 840ab4382d2SGreg Kroah-Hartman { 841ab4382d2SGreg Kroah-Hartman 842ab4382d2SGreg Kroah-Hartman pr_debug("uartlite: calling platform_driver_register()\n"); 843415b43bdSShubhrajyoti Datta return platform_driver_register(&ulite_platform_driver); 844ab4382d2SGreg Kroah-Hartman } 845ab4382d2SGreg Kroah-Hartman 8463240b48dSMichal Simek static void __exit ulite_exit(void) 847ab4382d2SGreg Kroah-Hartman { 848ab4382d2SGreg Kroah-Hartman platform_driver_unregister(&ulite_platform_driver); 849a553add0SRandy Dunlap if (ulite_uart_driver.state) 850ab4382d2SGreg Kroah-Hartman uart_unregister_driver(&ulite_uart_driver); 851ab4382d2SGreg Kroah-Hartman } 852ab4382d2SGreg Kroah-Hartman 853ab4382d2SGreg Kroah-Hartman module_init(ulite_init); 854ab4382d2SGreg Kroah-Hartman module_exit(ulite_exit); 855ab4382d2SGreg Kroah-Hartman 856ab4382d2SGreg Kroah-Hartman MODULE_AUTHOR("Peter Korsgaard <jacmet@sunsite.dk>"); 857ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("Xilinx uartlite serial driver"); 858ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 859