diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/tty/serial/efm32-uart.c | 855 |
1 files changed, 855 insertions, 0 deletions
diff --git a/drivers/tty/serial/efm32-uart.c b/drivers/tty/serial/efm32-uart.c new file mode 100644 index 000000000..d6b5e5463 --- /dev/null +++ b/drivers/tty/serial/efm32-uart.c @@ -0,0 +1,855 @@ +// SPDX-License-Identifier: GPL-2.0 +#if defined(CONFIG_SERIAL_EFM32_UART_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) +#define SUPPORT_SYSRQ +#endif + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/io.h> +#include <linux/platform_device.h> +#include <linux/console.h> +#include <linux/sysrq.h> +#include <linux/serial_core.h> +#include <linux/tty_flip.h> +#include <linux/slab.h> +#include <linux/clk.h> +#include <linux/of.h> +#include <linux/of_device.h> + +#include <linux/platform_data/efm32-uart.h> + +#define DRIVER_NAME "efm32-uart" +#define DEV_NAME "ttyefm" + +#define UARTn_CTRL 0x00 +#define UARTn_CTRL_SYNC 0x0001 +#define UARTn_CTRL_TXBIL 0x1000 + +#define UARTn_FRAME 0x04 +#define UARTn_FRAME_DATABITS__MASK 0x000f +#define UARTn_FRAME_DATABITS(n) ((n) - 3) +#define UARTn_FRAME_PARITY__MASK 0x0300 +#define UARTn_FRAME_PARITY_NONE 0x0000 +#define UARTn_FRAME_PARITY_EVEN 0x0200 +#define UARTn_FRAME_PARITY_ODD 0x0300 +#define UARTn_FRAME_STOPBITS_HALF 0x0000 +#define UARTn_FRAME_STOPBITS_ONE 0x1000 +#define UARTn_FRAME_STOPBITS_TWO 0x3000 + +#define UARTn_CMD 0x0c +#define UARTn_CMD_RXEN 0x0001 +#define UARTn_CMD_RXDIS 0x0002 +#define UARTn_CMD_TXEN 0x0004 +#define UARTn_CMD_TXDIS 0x0008 + +#define UARTn_STATUS 0x10 +#define UARTn_STATUS_TXENS 0x0002 +#define UARTn_STATUS_TXC 0x0020 +#define UARTn_STATUS_TXBL 0x0040 +#define UARTn_STATUS_RXDATAV 0x0080 + +#define UARTn_CLKDIV 0x14 + +#define UARTn_RXDATAX 0x18 +#define UARTn_RXDATAX_RXDATA__MASK 0x01ff +#define UARTn_RXDATAX_PERR 0x4000 +#define UARTn_RXDATAX_FERR 0x8000 +/* + * This is a software only flag used for ignore_status_mask and + * read_status_mask! It's used for breaks that the hardware doesn't report + * explicitly. + */ +#define SW_UARTn_RXDATAX_BERR 0x2000 + +#define UARTn_TXDATA 0x34 + +#define UARTn_IF 0x40 +#define UARTn_IF_TXC 0x0001 +#define UARTn_IF_TXBL 0x0002 +#define UARTn_IF_RXDATAV 0x0004 +#define UARTn_IF_RXOF 0x0010 + +#define UARTn_IFS 0x44 +#define UARTn_IFC 0x48 +#define UARTn_IEN 0x4c + +#define UARTn_ROUTE 0x54 +#define UARTn_ROUTE_LOCATION__MASK 0x0700 +#define UARTn_ROUTE_LOCATION(n) (((n) << 8) & UARTn_ROUTE_LOCATION__MASK) +#define UARTn_ROUTE_RXPEN 0x0001 +#define UARTn_ROUTE_TXPEN 0x0002 + +struct efm32_uart_port { + struct uart_port port; + unsigned int txirq; + struct clk *clk; + struct efm32_uart_pdata pdata; +}; +#define to_efm_port(_port) container_of(_port, struct efm32_uart_port, port) +#define efm_debug(efm_port, format, arg...) \ + dev_dbg(efm_port->port.dev, format, ##arg) + +static void efm32_uart_write32(struct efm32_uart_port *efm_port, + u32 value, unsigned offset) +{ + writel_relaxed(value, efm_port->port.membase + offset); +} + +static u32 efm32_uart_read32(struct efm32_uart_port *efm_port, + unsigned offset) +{ + return readl_relaxed(efm_port->port.membase + offset); +} + +static unsigned int efm32_uart_tx_empty(struct uart_port *port) +{ + struct efm32_uart_port *efm_port = to_efm_port(port); + u32 status = efm32_uart_read32(efm_port, UARTn_STATUS); + + if (status & UARTn_STATUS_TXC) + return TIOCSER_TEMT; + else + return 0; +} + +static void efm32_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) +{ + /* sorry, neither handshaking lines nor loop functionallity */ +} + +static unsigned int efm32_uart_get_mctrl(struct uart_port *port) +{ + /* sorry, no handshaking lines available */ + return TIOCM_CAR | TIOCM_CTS | TIOCM_DSR; +} + +static void efm32_uart_stop_tx(struct uart_port *port) +{ + struct efm32_uart_port *efm_port = to_efm_port(port); + u32 ien = efm32_uart_read32(efm_port, UARTn_IEN); + + efm32_uart_write32(efm_port, UARTn_CMD_TXDIS, UARTn_CMD); + ien &= ~(UARTn_IF_TXC | UARTn_IF_TXBL); + efm32_uart_write32(efm_port, ien, UARTn_IEN); +} + +static void efm32_uart_tx_chars(struct efm32_uart_port *efm_port) +{ + struct uart_port *port = &efm_port->port; + struct circ_buf *xmit = &port->state->xmit; + + while (efm32_uart_read32(efm_port, UARTn_STATUS) & + UARTn_STATUS_TXBL) { + if (port->x_char) { + port->icount.tx++; + efm32_uart_write32(efm_port, port->x_char, + UARTn_TXDATA); + port->x_char = 0; + continue; + } + if (!uart_circ_empty(xmit) && !uart_tx_stopped(port)) { + port->icount.tx++; + efm32_uart_write32(efm_port, xmit->buf[xmit->tail], + UARTn_TXDATA); + xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); + } else + break; + } + + if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + uart_write_wakeup(port); + + if (!port->x_char && uart_circ_empty(xmit) && + efm32_uart_read32(efm_port, UARTn_STATUS) & + UARTn_STATUS_TXC) + efm32_uart_stop_tx(port); +} + +static void efm32_uart_start_tx(struct uart_port *port) +{ + struct efm32_uart_port *efm_port = to_efm_port(port); + u32 ien; + + efm32_uart_write32(efm_port, + UARTn_IF_TXBL | UARTn_IF_TXC, UARTn_IFC); + ien = efm32_uart_read32(efm_port, UARTn_IEN); + efm32_uart_write32(efm_port, + ien | UARTn_IF_TXBL | UARTn_IF_TXC, UARTn_IEN); + efm32_uart_write32(efm_port, UARTn_CMD_TXEN, UARTn_CMD); + + efm32_uart_tx_chars(efm_port); +} + +static void efm32_uart_stop_rx(struct uart_port *port) +{ + struct efm32_uart_port *efm_port = to_efm_port(port); + + efm32_uart_write32(efm_port, UARTn_CMD_RXDIS, UARTn_CMD); +} + +static void efm32_uart_break_ctl(struct uart_port *port, int ctl) +{ + /* not possible without fiddling with gpios */ +} + +static void efm32_uart_rx_chars(struct efm32_uart_port *efm_port) +{ + struct uart_port *port = &efm_port->port; + + while (efm32_uart_read32(efm_port, UARTn_STATUS) & + UARTn_STATUS_RXDATAV) { + u32 rxdata = efm32_uart_read32(efm_port, UARTn_RXDATAX); + int flag = 0; + + /* + * This is a reserved bit and I only saw it read as 0. But to be + * sure not to be confused too much by new devices adhere to the + * warning in the reference manual that reserverd bits might + * read as 1 in the future. + */ + rxdata &= ~SW_UARTn_RXDATAX_BERR; + + port->icount.rx++; + + if ((rxdata & UARTn_RXDATAX_FERR) && + !(rxdata & UARTn_RXDATAX_RXDATA__MASK)) { + rxdata |= SW_UARTn_RXDATAX_BERR; + port->icount.brk++; + if (uart_handle_break(port)) + continue; + } else if (rxdata & UARTn_RXDATAX_PERR) + port->icount.parity++; + else if (rxdata & UARTn_RXDATAX_FERR) + port->icount.frame++; + + rxdata &= port->read_status_mask; + + if (rxdata & SW_UARTn_RXDATAX_BERR) + flag = TTY_BREAK; + else if (rxdata & UARTn_RXDATAX_PERR) + flag = TTY_PARITY; + else if (rxdata & UARTn_RXDATAX_FERR) + flag = TTY_FRAME; + else if (uart_handle_sysrq_char(port, + rxdata & UARTn_RXDATAX_RXDATA__MASK)) + continue; + + if ((rxdata & port->ignore_status_mask) == 0) + tty_insert_flip_char(&port->state->port, + rxdata & UARTn_RXDATAX_RXDATA__MASK, flag); + } +} + +static irqreturn_t efm32_uart_rxirq(int irq, void *data) +{ + struct efm32_uart_port *efm_port = data; + u32 irqflag = efm32_uart_read32(efm_port, UARTn_IF); + int handled = IRQ_NONE; + struct uart_port *port = &efm_port->port; + struct tty_port *tport = &port->state->port; + + spin_lock(&port->lock); + + if (irqflag & UARTn_IF_RXDATAV) { + efm32_uart_write32(efm_port, UARTn_IF_RXDATAV, UARTn_IFC); + efm32_uart_rx_chars(efm_port); + + handled = IRQ_HANDLED; + } + + if (irqflag & UARTn_IF_RXOF) { + efm32_uart_write32(efm_port, UARTn_IF_RXOF, UARTn_IFC); + port->icount.overrun++; + tty_insert_flip_char(tport, 0, TTY_OVERRUN); + + handled = IRQ_HANDLED; + } + + spin_unlock(&port->lock); + + tty_flip_buffer_push(tport); + + return handled; +} + +static irqreturn_t efm32_uart_txirq(int irq, void *data) +{ + struct efm32_uart_port *efm_port = data; + u32 irqflag = efm32_uart_read32(efm_port, UARTn_IF); + + /* TXBL doesn't need to be cleared */ + if (irqflag & UARTn_IF_TXC) + efm32_uart_write32(efm_port, UARTn_IF_TXC, UARTn_IFC); + + if (irqflag & (UARTn_IF_TXC | UARTn_IF_TXBL)) { + efm32_uart_tx_chars(efm_port); + return IRQ_HANDLED; + } else + return IRQ_NONE; +} + +static int efm32_uart_startup(struct uart_port *port) +{ + struct efm32_uart_port *efm_port = to_efm_port(port); + int ret; + + ret = clk_enable(efm_port->clk); + if (ret) { + efm_debug(efm_port, "failed to enable clk\n"); + goto err_clk_enable; + } + port->uartclk = clk_get_rate(efm_port->clk); + + /* Enable pins at configured location */ + efm32_uart_write32(efm_port, + UARTn_ROUTE_LOCATION(efm_port->pdata.location) | + UARTn_ROUTE_RXPEN | UARTn_ROUTE_TXPEN, + UARTn_ROUTE); + + ret = request_irq(port->irq, efm32_uart_rxirq, 0, + DRIVER_NAME, efm_port); + if (ret) { + efm_debug(efm_port, "failed to register rxirq\n"); + goto err_request_irq_rx; + } + + /* disable all irqs */ + efm32_uart_write32(efm_port, 0, UARTn_IEN); + + ret = request_irq(efm_port->txirq, efm32_uart_txirq, 0, + DRIVER_NAME, efm_port); + if (ret) { + efm_debug(efm_port, "failed to register txirq\n"); + free_irq(port->irq, efm_port); +err_request_irq_rx: + + clk_disable(efm_port->clk); + } else { + efm32_uart_write32(efm_port, + UARTn_IF_RXDATAV | UARTn_IF_RXOF, UARTn_IEN); + efm32_uart_write32(efm_port, UARTn_CMD_RXEN, UARTn_CMD); + } + +err_clk_enable: + return ret; +} + +static void efm32_uart_shutdown(struct uart_port *port) +{ + struct efm32_uart_port *efm_port = to_efm_port(port); + + efm32_uart_write32(efm_port, 0, UARTn_IEN); + free_irq(port->irq, efm_port); + + clk_disable(efm_port->clk); +} + +static void efm32_uart_set_termios(struct uart_port *port, + struct ktermios *new, struct ktermios *old) +{ + struct efm32_uart_port *efm_port = to_efm_port(port); + unsigned long flags; + unsigned baud; + u32 clkdiv; + u32 frame = 0; + + /* no modem control lines */ + new->c_cflag &= ~(CRTSCTS | CMSPAR); + + baud = uart_get_baud_rate(port, new, old, + DIV_ROUND_CLOSEST(port->uartclk, 16 * 8192), + DIV_ROUND_CLOSEST(port->uartclk, 16)); + + switch (new->c_cflag & CSIZE) { + case CS5: + frame |= UARTn_FRAME_DATABITS(5); + break; + case CS6: + frame |= UARTn_FRAME_DATABITS(6); + break; + case CS7: + frame |= UARTn_FRAME_DATABITS(7); + break; + case CS8: + frame |= UARTn_FRAME_DATABITS(8); + break; + } + + if (new->c_cflag & CSTOPB) + /* the receiver only verifies the first stop bit */ + frame |= UARTn_FRAME_STOPBITS_TWO; + else + frame |= UARTn_FRAME_STOPBITS_ONE; + + if (new->c_cflag & PARENB) { + if (new->c_cflag & PARODD) + frame |= UARTn_FRAME_PARITY_ODD; + else + frame |= UARTn_FRAME_PARITY_EVEN; + } else + frame |= UARTn_FRAME_PARITY_NONE; + + /* + * the 6 lowest bits of CLKDIV are dc, bit 6 has value 0.25. + * port->uartclk <= 14e6, so 4 * port->uartclk doesn't overflow. + */ + clkdiv = (DIV_ROUND_CLOSEST(4 * port->uartclk, 16 * baud) - 4) << 6; + + spin_lock_irqsave(&port->lock, flags); + + efm32_uart_write32(efm_port, + UARTn_CMD_TXDIS | UARTn_CMD_RXDIS, UARTn_CMD); + + port->read_status_mask = UARTn_RXDATAX_RXDATA__MASK; + if (new->c_iflag & INPCK) + port->read_status_mask |= + UARTn_RXDATAX_FERR | UARTn_RXDATAX_PERR; + if (new->c_iflag & (IGNBRK | BRKINT | PARMRK)) + port->read_status_mask |= SW_UARTn_RXDATAX_BERR; + + port->ignore_status_mask = 0; + if (new->c_iflag & IGNPAR) + port->ignore_status_mask |= + UARTn_RXDATAX_FERR | UARTn_RXDATAX_PERR; + if (new->c_iflag & IGNBRK) + port->ignore_status_mask |= SW_UARTn_RXDATAX_BERR; + + uart_update_timeout(port, new->c_cflag, baud); + + efm32_uart_write32(efm_port, UARTn_CTRL_TXBIL, UARTn_CTRL); + efm32_uart_write32(efm_port, frame, UARTn_FRAME); + efm32_uart_write32(efm_port, clkdiv, UARTn_CLKDIV); + + efm32_uart_write32(efm_port, UARTn_CMD_TXEN | UARTn_CMD_RXEN, + UARTn_CMD); + + spin_unlock_irqrestore(&port->lock, flags); +} + +static const char *efm32_uart_type(struct uart_port *port) +{ + return port->type == PORT_EFMUART ? "efm32-uart" : NULL; +} + +static void efm32_uart_release_port(struct uart_port *port) +{ + struct efm32_uart_port *efm_port = to_efm_port(port); + + clk_unprepare(efm_port->clk); + clk_put(efm_port->clk); + iounmap(port->membase); +} + +static int efm32_uart_request_port(struct uart_port *port) +{ + struct efm32_uart_port *efm_port = to_efm_port(port); + int ret; + + port->membase = ioremap(port->mapbase, 60); + if (!efm_port->port.membase) { + ret = -ENOMEM; + efm_debug(efm_port, "failed to remap\n"); + goto err_ioremap; + } + + efm_port->clk = clk_get(port->dev, NULL); + if (IS_ERR(efm_port->clk)) { + ret = PTR_ERR(efm_port->clk); + efm_debug(efm_port, "failed to get clock\n"); + goto err_clk_get; + } + + ret = clk_prepare(efm_port->clk); + if (ret) { + clk_put(efm_port->clk); +err_clk_get: + + iounmap(port->membase); +err_ioremap: + return ret; + } + return 0; +} + +static void efm32_uart_config_port(struct uart_port *port, int type) +{ + if (type & UART_CONFIG_TYPE && + !efm32_uart_request_port(port)) + port->type = PORT_EFMUART; +} + +static int efm32_uart_verify_port(struct uart_port *port, + struct serial_struct *serinfo) +{ + int ret = 0; + + if (serinfo->type != PORT_UNKNOWN && serinfo->type != PORT_EFMUART) + ret = -EINVAL; + + return ret; +} + +static const struct uart_ops efm32_uart_pops = { + .tx_empty = efm32_uart_tx_empty, + .set_mctrl = efm32_uart_set_mctrl, + .get_mctrl = efm32_uart_get_mctrl, + .stop_tx = efm32_uart_stop_tx, + .start_tx = efm32_uart_start_tx, + .stop_rx = efm32_uart_stop_rx, + .break_ctl = efm32_uart_break_ctl, + .startup = efm32_uart_startup, + .shutdown = efm32_uart_shutdown, + .set_termios = efm32_uart_set_termios, + .type = efm32_uart_type, + .release_port = efm32_uart_release_port, + .request_port = efm32_uart_request_port, + .config_port = efm32_uart_config_port, + .verify_port = efm32_uart_verify_port, +}; + +static struct efm32_uart_port *efm32_uart_ports[5]; + +#ifdef CONFIG_SERIAL_EFM32_UART_CONSOLE +static void efm32_uart_console_putchar(struct uart_port *port, int ch) +{ + struct efm32_uart_port *efm_port = to_efm_port(port); + unsigned int timeout = 0x400; + u32 status; + + while (1) { + status = efm32_uart_read32(efm_port, UARTn_STATUS); + + if (status & UARTn_STATUS_TXBL) + break; + if (!timeout--) + return; + } + efm32_uart_write32(efm_port, ch, UARTn_TXDATA); +} + +static void efm32_uart_console_write(struct console *co, const char *s, + unsigned int count) +{ + struct efm32_uart_port *efm_port = efm32_uart_ports[co->index]; + u32 status = efm32_uart_read32(efm_port, UARTn_STATUS); + unsigned int timeout = 0x400; + + if (!(status & UARTn_STATUS_TXENS)) + efm32_uart_write32(efm_port, UARTn_CMD_TXEN, UARTn_CMD); + + uart_console_write(&efm_port->port, s, count, + efm32_uart_console_putchar); + + /* Wait for the transmitter to become empty */ + while (1) { + u32 status = efm32_uart_read32(efm_port, UARTn_STATUS); + if (status & UARTn_STATUS_TXC) + break; + if (!timeout--) + break; + } + + if (!(status & UARTn_STATUS_TXENS)) + efm32_uart_write32(efm_port, UARTn_CMD_TXDIS, UARTn_CMD); +} + +static void efm32_uart_console_get_options(struct efm32_uart_port *efm_port, + int *baud, int *parity, int *bits) +{ + u32 ctrl = efm32_uart_read32(efm_port, UARTn_CTRL); + u32 route, clkdiv, frame; + + if (ctrl & UARTn_CTRL_SYNC) + /* not operating in async mode */ + return; + + route = efm32_uart_read32(efm_port, UARTn_ROUTE); + if (!(route & UARTn_ROUTE_TXPEN)) + /* tx pin not routed */ + return; + + clkdiv = efm32_uart_read32(efm_port, UARTn_CLKDIV); + + *baud = DIV_ROUND_CLOSEST(4 * efm_port->port.uartclk, + 16 * (4 + (clkdiv >> 6))); + + frame = efm32_uart_read32(efm_port, UARTn_FRAME); + switch (frame & UARTn_FRAME_PARITY__MASK) { + case UARTn_FRAME_PARITY_ODD: + *parity = 'o'; + break; + case UARTn_FRAME_PARITY_EVEN: + *parity = 'e'; + break; + default: + *parity = 'n'; + } + + *bits = (frame & UARTn_FRAME_DATABITS__MASK) - + UARTn_FRAME_DATABITS(4) + 4; + + efm_debug(efm_port, "get_opts: options=%d%c%d\n", + *baud, *parity, *bits); +} + +static int efm32_uart_console_setup(struct console *co, char *options) +{ + struct efm32_uart_port *efm_port; + int baud = 115200; + int bits = 8; + int parity = 'n'; + int flow = 'n'; + int ret; + + if (co->index < 0 || co->index >= ARRAY_SIZE(efm32_uart_ports)) { + unsigned i; + for (i = 0; i < ARRAY_SIZE(efm32_uart_ports); ++i) { + if (efm32_uart_ports[i]) { + pr_warn("efm32-console: fall back to console index %u (from %hhi)\n", + i, co->index); + co->index = i; + break; + } + } + } + + efm_port = efm32_uart_ports[co->index]; + if (!efm_port) { + pr_warn("efm32-console: No port at %d\n", co->index); + return -ENODEV; + } + + ret = clk_prepare(efm_port->clk); + if (ret) { + dev_warn(efm_port->port.dev, + "console: clk_prepare failed: %d\n", ret); + return ret; + } + + efm_port->port.uartclk = clk_get_rate(efm_port->clk); + + if (options) + uart_parse_options(options, &baud, &parity, &bits, &flow); + else + efm32_uart_console_get_options(efm_port, + &baud, &parity, &bits); + + return uart_set_options(&efm_port->port, co, baud, parity, bits, flow); +} + +static struct uart_driver efm32_uart_reg; + +static struct console efm32_uart_console = { + .name = DEV_NAME, + .write = efm32_uart_console_write, + .device = uart_console_device, + .setup = efm32_uart_console_setup, + .flags = CON_PRINTBUFFER, + .index = -1, + .data = &efm32_uart_reg, +}; + +#else +#define efm32_uart_console (*(struct console *)NULL) +#endif /* ifdef CONFIG_SERIAL_EFM32_UART_CONSOLE / else */ + +static struct uart_driver efm32_uart_reg = { + .owner = THIS_MODULE, + .driver_name = DRIVER_NAME, + .dev_name = DEV_NAME, + .nr = ARRAY_SIZE(efm32_uart_ports), + .cons = &efm32_uart_console, +}; + +static int efm32_uart_probe_dt(struct platform_device *pdev, + struct efm32_uart_port *efm_port) +{ + struct device_node *np = pdev->dev.of_node; + u32 location; + int ret; + + if (!np) + return 1; + + ret = of_property_read_u32(np, "energymicro,location", &location); + + if (ret) + /* fall back to wrongly namespaced property */ + ret = of_property_read_u32(np, "efm32,location", &location); + + if (ret) + /* fall back to old and (wrongly) generic property "location" */ + ret = of_property_read_u32(np, "location", &location); + + if (!ret) { + if (location > 5) { + dev_err(&pdev->dev, "invalid location\n"); + return -EINVAL; + } + efm_debug(efm_port, "using location %u\n", location); + efm_port->pdata.location = location; + } else { + efm_debug(efm_port, "fall back to location 0\n"); + } + + ret = of_alias_get_id(np, "serial"); + if (ret < 0) { + dev_err(&pdev->dev, "failed to get alias id: %d\n", ret); + return ret; + } else { + efm_port->port.line = ret; + return 0; + } + +} + +static int efm32_uart_probe(struct platform_device *pdev) +{ + struct efm32_uart_port *efm_port; + struct resource *res; + unsigned int line; + int ret; + + efm_port = kzalloc(sizeof(*efm_port), GFP_KERNEL); + if (!efm_port) { + dev_dbg(&pdev->dev, "failed to allocate private data\n"); + return -ENOMEM; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + ret = -ENODEV; + dev_dbg(&pdev->dev, "failed to determine base address\n"); + goto err_get_base; + } + + if (resource_size(res) < 60) { + ret = -EINVAL; + dev_dbg(&pdev->dev, "memory resource too small\n"); + goto err_too_small; + } + + ret = platform_get_irq(pdev, 0); + if (ret <= 0) { + dev_dbg(&pdev->dev, "failed to get rx irq\n"); + goto err_get_rxirq; + } + + efm_port->port.irq = ret; + + ret = platform_get_irq(pdev, 1); + if (ret <= 0) + ret = efm_port->port.irq + 1; + + efm_port->txirq = ret; + + efm_port->port.dev = &pdev->dev; + efm_port->port.mapbase = res->start; + efm_port->port.type = PORT_EFMUART; + efm_port->port.iotype = UPIO_MEM32; + efm_port->port.fifosize = 2; + efm_port->port.ops = &efm32_uart_pops; + efm_port->port.flags = UPF_BOOT_AUTOCONF; + + ret = efm32_uart_probe_dt(pdev, efm_port); + if (ret > 0) { + /* not created by device tree */ + const struct efm32_uart_pdata *pdata = dev_get_platdata(&pdev->dev); + + efm_port->port.line = pdev->id; + + if (pdata) + efm_port->pdata = *pdata; + } else if (ret < 0) + goto err_probe_dt; + + line = efm_port->port.line; + + if (line >= 0 && line < ARRAY_SIZE(efm32_uart_ports)) + efm32_uart_ports[line] = efm_port; + + ret = uart_add_one_port(&efm32_uart_reg, &efm_port->port); + if (ret) { + dev_dbg(&pdev->dev, "failed to add port: %d\n", ret); + + if (line >= 0 && line < ARRAY_SIZE(efm32_uart_ports)) + efm32_uart_ports[line] = NULL; +err_probe_dt: +err_get_rxirq: +err_too_small: +err_get_base: + kfree(efm_port); + } else { + platform_set_drvdata(pdev, efm_port); + dev_dbg(&pdev->dev, "\\o/\n"); + } + + return ret; +} + +static int efm32_uart_remove(struct platform_device *pdev) +{ + struct efm32_uart_port *efm_port = platform_get_drvdata(pdev); + unsigned int line = efm_port->port.line; + + uart_remove_one_port(&efm32_uart_reg, &efm_port->port); + + if (line >= 0 && line < ARRAY_SIZE(efm32_uart_ports)) + efm32_uart_ports[line] = NULL; + + kfree(efm_port); + + return 0; +} + +static const struct of_device_id efm32_uart_dt_ids[] = { + { + .compatible = "energymicro,efm32-uart", + }, { + /* doesn't follow the "vendor,device" scheme, don't use */ + .compatible = "efm32,uart", + }, { + /* sentinel */ + } +}; +MODULE_DEVICE_TABLE(of, efm32_uart_dt_ids); + +static struct platform_driver efm32_uart_driver = { + .probe = efm32_uart_probe, + .remove = efm32_uart_remove, + + .driver = { + .name = DRIVER_NAME, + .of_match_table = efm32_uart_dt_ids, + }, +}; + +static int __init efm32_uart_init(void) +{ + int ret; + + ret = uart_register_driver(&efm32_uart_reg); + if (ret) + return ret; + + ret = platform_driver_register(&efm32_uart_driver); + if (ret) + uart_unregister_driver(&efm32_uart_reg); + + pr_info("EFM32 UART/USART driver\n"); + + return ret; +} +module_init(efm32_uart_init); + +static void __exit efm32_uart_exit(void) +{ + platform_driver_unregister(&efm32_uart_driver); + uart_unregister_driver(&efm32_uart_reg); +} +module_exit(efm32_uart_exit); + +MODULE_AUTHOR("Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>"); +MODULE_DESCRIPTION("EFM32 UART/USART driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:" DRIVER_NAME); |