diff options
Diffstat (limited to 'drivers/tty/serial/pic32_uart.c')
| -rw-r--r-- | drivers/tty/serial/pic32_uart.c | 159 |
1 files changed, 116 insertions, 43 deletions
diff --git a/drivers/tty/serial/pic32_uart.c b/drivers/tty/serial/pic32_uart.c index b7a3a1b959b1..b399aac530fe 100644 --- a/drivers/tty/serial/pic32_uart.c +++ b/drivers/tty/serial/pic32_uart.c @@ -25,38 +25,114 @@ #include <linux/delay.h> #include <asm/mach-pic32/pic32.h> -#include "pic32_uart.h" /* UART name and device definitions */ #define PIC32_DEV_NAME "pic32-uart" #define PIC32_MAX_UARTS 6 #define PIC32_SDEV_NAME "ttyPIC" -/* pic32_sport pointer for console use */ -static struct pic32_sport *pic32_sports[PIC32_MAX_UARTS]; +#define PIC32_UART_DFLT_BRATE 9600 +#define PIC32_UART_TX_FIFO_DEPTH 8 +#define PIC32_UART_RX_FIFO_DEPTH 8 + +#define PIC32_UART_MODE 0x00 +#define PIC32_UART_STA 0x10 +#define PIC32_UART_TX 0x20 +#define PIC32_UART_RX 0x30 +#define PIC32_UART_BRG 0x40 + +/* struct pic32_sport - pic32 serial port descriptor + * @port: uart port descriptor + * @idx: port index + * @irq_fault: virtual fault interrupt number + * @irq_fault_name: irq fault name + * @irq_rx: virtual rx interrupt number + * @irq_rx_name: irq rx name + * @irq_tx: virtual tx interrupt number + * @irq_tx_name: irq tx name + * @cts_gpio: clear to send gpio + * @dev: device descriptor + **/ +struct pic32_sport { + struct uart_port port; + int idx; + + int irq_fault; + const char *irq_fault_name; + int irq_rx; + const char *irq_rx_name; + int irq_tx; + const char *irq_tx_name; + bool enable_tx_irq; + + bool hw_flow_ctrl; + int cts_gpio; + + struct clk *clk; + + struct device *dev; +}; -static inline void pic32_wait_deplete_txbuf(struct pic32_sport *sport) +static inline struct pic32_sport *to_pic32_sport(struct uart_port *port) { - /* wait for tx empty, otherwise chars will be lost or corrupted */ - while (!(pic32_uart_readl(sport, PIC32_UART_STA) & PIC32_UART_STA_TRMT)) - udelay(1); + return container_of(port, struct pic32_sport, port); } -static inline int pic32_enable_clock(struct pic32_sport *sport) +static inline void pic32_uart_writel(struct pic32_sport *sport, + u32 reg, u32 val) { - int ret = clk_prepare_enable(sport->clk); - - if (ret) - return ret; + __raw_writel(val, sport->port.membase + reg); +} - sport->ref_clk++; - return 0; +static inline u32 pic32_uart_readl(struct pic32_sport *sport, u32 reg) +{ + return __raw_readl(sport->port.membase + reg); } -static inline void pic32_disable_clock(struct pic32_sport *sport) +/* pic32 uart mode register bits */ +#define PIC32_UART_MODE_ON BIT(15) +#define PIC32_UART_MODE_FRZ BIT(14) +#define PIC32_UART_MODE_SIDL BIT(13) +#define PIC32_UART_MODE_IREN BIT(12) +#define PIC32_UART_MODE_RTSMD BIT(11) +#define PIC32_UART_MODE_RESV1 BIT(10) +#define PIC32_UART_MODE_UEN1 BIT(9) +#define PIC32_UART_MODE_UEN0 BIT(8) +#define PIC32_UART_MODE_WAKE BIT(7) +#define PIC32_UART_MODE_LPBK BIT(6) +#define PIC32_UART_MODE_ABAUD BIT(5) +#define PIC32_UART_MODE_RXINV BIT(4) +#define PIC32_UART_MODE_BRGH BIT(3) +#define PIC32_UART_MODE_PDSEL1 BIT(2) +#define PIC32_UART_MODE_PDSEL0 BIT(1) +#define PIC32_UART_MODE_STSEL BIT(0) + +/* pic32 uart status register bits */ +#define PIC32_UART_STA_UTXISEL1 BIT(15) +#define PIC32_UART_STA_UTXISEL0 BIT(14) +#define PIC32_UART_STA_UTXINV BIT(13) +#define PIC32_UART_STA_URXEN BIT(12) +#define PIC32_UART_STA_UTXBRK BIT(11) +#define PIC32_UART_STA_UTXEN BIT(10) +#define PIC32_UART_STA_UTXBF BIT(9) +#define PIC32_UART_STA_TRMT BIT(8) +#define PIC32_UART_STA_URXISEL1 BIT(7) +#define PIC32_UART_STA_URXISEL0 BIT(6) +#define PIC32_UART_STA_ADDEN BIT(5) +#define PIC32_UART_STA_RIDLE BIT(4) +#define PIC32_UART_STA_PERR BIT(3) +#define PIC32_UART_STA_FERR BIT(2) +#define PIC32_UART_STA_OERR BIT(1) +#define PIC32_UART_STA_URXDA BIT(0) + +/* pic32_sport pointer for console use */ +static struct pic32_sport *pic32_sports[PIC32_MAX_UARTS]; + +static inline void pic32_wait_deplete_txbuf(struct pic32_sport *sport) { - sport->ref_clk--; - clk_disable_unprepare(sport->clk); + /* wait for tx empty, otherwise chars will be lost or corrupted */ + while (!(pic32_uart_readl(sport, PIC32_UART_STA) & PIC32_UART_STA_TRMT)) + udelay(1); } /* serial core request to check if uart tx buffer is empty */ @@ -117,16 +193,16 @@ static unsigned int pic32_uart_get_mctrl(struct uart_port *port) */ static inline void pic32_uart_irqtxen(struct pic32_sport *sport, u8 en) { - if (en && !tx_irq_enabled(sport)) { + if (en && !sport->enable_tx_irq) { enable_irq(sport->irq_tx); - tx_irq_enabled(sport) = 1; - } else if (!en && tx_irq_enabled(sport)) { + sport->enable_tx_irq = true; + } else if (!en && sport->enable_tx_irq) { /* use disable_irq_nosync() and not disable_irq() to avoid self * imposed deadlock by not waiting for irq handler to end, * since this callback is called from interrupt context. */ disable_irq_nosync(sport->irq_tx); - tx_irq_enabled(sport) = 0; + sport->enable_tx_irq = false; } } @@ -395,7 +471,7 @@ static int pic32_uart_startup(struct uart_port *port) local_irq_save(flags); - ret = pic32_enable_clock(sport); + ret = clk_prepare_enable(sport->clk); if (ret) { local_irq_restore(flags); goto out_done; @@ -419,7 +495,7 @@ static int pic32_uart_startup(struct uart_port *port) * For each irq request_irq() is called with interrupt disabled. * And the irq is enabled as soon as we are ready to handle them. */ - tx_irq_enabled(sport) = 0; + sport->enable_tx_irq = false; sport->irq_fault_name = kasprintf(GFP_KERNEL, "%s%d-fault", pic32_uart_type(port), @@ -431,7 +507,7 @@ static int pic32_uart_startup(struct uart_port *port) } irq_set_status_flags(sport->irq_fault, IRQ_NOAUTOEN); ret = request_irq(sport->irq_fault, pic32_uart_fault_interrupt, - sport->irqflags_fault, sport->irq_fault_name, port); + IRQF_NO_THREAD, sport->irq_fault_name, port); if (ret) { dev_err(port->dev, "%s: request irq(%d) err! ret:%d name:%s\n", __func__, sport->irq_fault, ret, @@ -449,7 +525,7 @@ static int pic32_uart_startup(struct uart_port *port) } irq_set_status_flags(sport->irq_rx, IRQ_NOAUTOEN); ret = request_irq(sport->irq_rx, pic32_uart_rx_interrupt, - sport->irqflags_rx, sport->irq_rx_name, port); + IRQF_NO_THREAD, sport->irq_rx_name, port); if (ret) { dev_err(port->dev, "%s: request irq(%d) err! ret:%d name:%s\n", __func__, sport->irq_rx, ret, @@ -467,7 +543,7 @@ static int pic32_uart_startup(struct uart_port *port) } irq_set_status_flags(sport->irq_tx, IRQ_NOAUTOEN); ret = request_irq(sport->irq_tx, pic32_uart_tx_interrupt, - sport->irqflags_tx, sport->irq_tx_name, port); + IRQF_NO_THREAD, sport->irq_tx_name, port); if (ret) { dev_err(port->dev, "%s: request irq(%d) err! ret:%d name:%s\n", __func__, sport->irq_tx, ret, @@ -488,19 +564,21 @@ static int pic32_uart_startup(struct uart_port *port) /* enable all interrupts and eanable uart */ pic32_uart_en_and_unmask(port); + local_irq_restore(flags); + enable_irq(sport->irq_rx); return 0; out_t: - kfree(sport->irq_tx_name); free_irq(sport->irq_tx, port); + kfree(sport->irq_tx_name); out_r: - kfree(sport->irq_rx_name); free_irq(sport->irq_rx, port); + kfree(sport->irq_rx_name); out_f: - kfree(sport->irq_fault_name); free_irq(sport->irq_fault, port); + kfree(sport->irq_fault_name); out_done: return ret; } @@ -515,12 +593,15 @@ static void pic32_uart_shutdown(struct uart_port *port) spin_lock_irqsave(&port->lock, flags); pic32_uart_dsbl_and_mask(port); spin_unlock_irqrestore(&port->lock, flags); - pic32_disable_clock(sport); + clk_disable_unprepare(sport->clk); /* free all 3 interrupts for this UART */ free_irq(sport->irq_fault, port); + kfree(sport->irq_fault_name); free_irq(sport->irq_tx, port); + kfree(sport->irq_tx_name); free_irq(sport->irq_rx, port); + kfree(sport->irq_rx_name); } /* serial core request to change current uart setting */ @@ -712,10 +793,9 @@ static void pic32_console_write(struct console *co, const char *s, unsigned int count) { struct pic32_sport *sport = pic32_sports[co->index]; - struct uart_port *port = pic32_get_port(sport); /* call uart helper to deal with \r\n */ - uart_console_write(port, s, count, pic32_console_putchar); + uart_console_write(&sport->port, s, count, pic32_console_putchar); } /* console core request to setup given console, find matching uart @@ -724,7 +804,6 @@ static void pic32_console_write(struct console *co, const char *s, static int pic32_console_setup(struct console *co, char *options) { struct pic32_sport *sport; - struct uart_port *port = NULL; int baud = 115200; int bits = 8; int parity = 'n'; @@ -737,16 +816,15 @@ static int pic32_console_setup(struct console *co, char *options) sport = pic32_sports[co->index]; if (!sport) return -ENODEV; - port = pic32_get_port(sport); - ret = pic32_enable_clock(sport); + ret = clk_prepare_enable(sport->clk); if (ret) return ret; if (options) uart_parse_options(options, &baud, &parity, &bits, &flow); - return uart_set_options(port, co, baud, parity, bits, flow); + return uart_set_options(&sport->port, co, baud, parity, bits, flow); } static struct uart_driver pic32_uart_driver; @@ -816,13 +894,9 @@ static int pic32_uart_probe(struct platform_device *pdev) sport->idx = uart_idx; sport->irq_fault = irq_of_parse_and_map(np, 0); - sport->irqflags_fault = IRQF_NO_THREAD; sport->irq_rx = irq_of_parse_and_map(np, 1); - sport->irqflags_rx = IRQF_NO_THREAD; sport->irq_tx = irq_of_parse_and_map(np, 2); - sport->irqflags_tx = IRQF_NO_THREAD; sport->clk = devm_clk_get(&pdev->dev, NULL); - sport->cts_gpio = -EINVAL; sport->dev = &pdev->dev; /* Hardware flow control: gpios @@ -850,7 +924,6 @@ static int pic32_uart_probe(struct platform_device *pdev) pic32_sports[uart_idx] = sport; port = &sport->port; - memset(port, 0, sizeof(*port)); port->iotype = UPIO_MEM; port->mapbase = res_mem->start; port->ops = &pic32_uart_ops; @@ -872,7 +945,7 @@ static int pic32_uart_probe(struct platform_device *pdev) /* The peripheral clock has been enabled by console_setup, * so disable it till the port is used. */ - pic32_disable_clock(sport); + clk_disable_unprepare(sport->clk); } #endif @@ -893,7 +966,7 @@ static int pic32_uart_remove(struct platform_device *pdev) struct pic32_sport *sport = to_pic32_sport(port); uart_remove_one_port(&pic32_uart_driver, port); - pic32_disable_clock(sport); + clk_disable_unprepare(sport->clk); platform_set_drvdata(pdev, NULL); pic32_sports[sport->idx] = NULL; |