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author | Marek Vasut <marek.vasut@gmail.com> | 2011-08-28 03:35:13 +0200 |
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committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2011-11-15 22:24:50 +0100 |
commit | 237ce0fe97f9d4206011fcb9f509e50fef4ef2f0 (patch) | |
tree | 4f6435c5725ce0504d7ecd3096c65784a1b57039 /drivers/serial/serial_pxa.c | |
parent | dd36d806fe549f40e059dd9d5072f8e017ed30dd (diff) | |
download | u-boot-imx-237ce0fe97f9d4206011fcb9f509e50fef4ef2f0.zip u-boot-imx-237ce0fe97f9d4206011fcb9f509e50fef4ef2f0.tar.gz u-boot-imx-237ce0fe97f9d4206011fcb9f509e50fef4ef2f0.tar.bz2 |
PXA: Cleanup serial_pxa
* Cleanup register definitions by introducing new regs-uart.h, compliant with
rest of U-Boot.
* Remove old register definitions from pxa-regs.h
* Convert serial_pxa to new regs-uart.h
* Cleanup serial_pxa
Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Diffstat (limited to 'drivers/serial/serial_pxa.c')
-rw-r--r-- | drivers/serial/serial_pxa.c | 464 |
1 files changed, 188 insertions, 276 deletions
diff --git a/drivers/serial/serial_pxa.c b/drivers/serial/serial_pxa.c index 68469a4..84bb17c 100644 --- a/drivers/serial/serial_pxa.c +++ b/drivers/serial/serial_pxa.c @@ -1,4 +1,6 @@ /* + * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com> + * * (C) Copyright 2002 * Wolfgang Denk, DENX Software Engineering, <wd@denx.de> * @@ -32,148 +34,161 @@ #include <watchdog.h> #include <serial.h> #include <asm/arch/pxa-regs.h> +#include <asm/arch/regs-uart.h> #include <asm/io.h> DECLARE_GLOBAL_DATA_PTR; -#define FFUART_INDEX 0 -#define BTUART_INDEX 1 -#define STUART_INDEX 2 +/* + * The numbering scheme differs here for PXA25x, PXA27x and PXA3xx so we can + * easily handle enabling of clock. + */ +#ifdef CONFIG_CPU_MONAHANS +#define UART_CLK_BASE CKENA_21_BTUART +#define UART_CLK_REG CKENA +#define BTUART_INDEX 0 +#define FFUART_INDEX 1 +#define STUART_INDEX 2 +#elif CONFIG_PXA250 +#define UART_CLK_BASE (1 << 4) /* HWUART */ +#define UART_CLK_REG CKEN +#define HWUART_INDEX 0 +#define STUART_INDEX 1 +#define FFUART_INDEX 2 +#define BTUART_INDEX 3 +#else /* PXA27x */ +#define UART_CLK_BASE CKEN5_STUART +#define UART_CLK_REG CKEN +#define STUART_INDEX 0 +#define FFUART_INDEX 1 +#define BTUART_INDEX 2 +#endif + +/* + * Only PXA250 has HWUART, to avoid poluting the code with more macros, + * artificially introduce this. + */ +#ifndef CONFIG_PXA250 +#define HWUART_INDEX 0xff +#endif #ifndef CONFIG_SERIAL_MULTI -#if defined (CONFIG_FFUART) +#if defined(CONFIG_FFUART) #define UART_INDEX FFUART_INDEX -#elif defined (CONFIG_BTUART) +#elif defined(CONFIG_BTUART) #define UART_INDEX BTUART_INDEX -#elif defined (CONFIG_STUART) +#elif defined(CONFIG_STUART) #define UART_INDEX STUART_INDEX +#elif defined(CONFIG_HWUART) +#define UART_INDEX HWUART_INDEX #else -#error "Bad: you didn't configure serial ..." +#error "Please select CONFIG_(FF|BT|ST|HW)UART in board config file." #endif #endif -void pxa_setbrg_dev (unsigned int uart_index) +uint32_t pxa_uart_get_baud_divider(void) { - unsigned int quot = 0; - if (gd->baudrate == 1200) - quot = 768; + return 768; else if (gd->baudrate == 9600) - quot = 96; + return 96; else if (gd->baudrate == 19200) - quot = 48; + return 48; else if (gd->baudrate == 38400) - quot = 24; + return 24; else if (gd->baudrate == 57600) - quot = 16; + return 16; else if (gd->baudrate == 115200) - quot = 8; - else - hang (); + return 8; + else /* Unsupported baudrate */ + return 0; +} +struct pxa_uart_regs *pxa_uart_index_to_regs(uint32_t uart_index) +{ switch (uart_index) { - case FFUART_INDEX: -#ifdef CONFIG_CPU_MONAHANS - writel(readl(CKENA) | CKENA_22_FFUART, CKENA); -#else - writel(readl(CKEN) | CKEN6_FFUART, CKEN); -#endif /* CONFIG_CPU_MONAHANS */ - - writel(0, FFIER); /* Disable for now */ - writel(0, FFFCR); /* No fifos enabled */ + case FFUART_INDEX: return (struct pxa_uart_regs *)FFUART_BASE; + case BTUART_INDEX: return (struct pxa_uart_regs *)BTUART_BASE; + case STUART_INDEX: return (struct pxa_uart_regs *)STUART_BASE; + case HWUART_INDEX: return (struct pxa_uart_regs *)HWUART_BASE; + default: + return NULL; + } +} - /* set baud rate */ - writel(LCR_WLS0 | LCR_WLS1 | LCR_DLAB, FFLCR); - writel(quot & 0xff, FFDLL); - writel(quot >> 8, FFDLH); - writel(LCR_WLS0 | LCR_WLS1, FFLCR); +void pxa_uart_toggle_clock(uint32_t uart_index, int enable) +{ + uint32_t clk_reg, clk_offset, reg; - writel(IER_UUE, FFIER); /* Enable FFUART */ - break; + clk_reg = UART_CLK_REG; + clk_offset = UART_CLK_BASE << uart_index; - case BTUART_INDEX: -#ifdef CONFIG_CPU_MONAHANS - writel(readl(CKENA) | CKENA_21_BTUART, CKENA); -#else - writel(readl(CKEN) | CKEN7_BTUART, CKEN); -#endif /* CONFIG_CPU_MONAHANS */ + reg = readl(clk_reg); - writel(0, BTIER); - writel(0, BTFCR); + if (enable) + reg |= clk_offset; + else + reg &= ~clk_offset; - /* set baud rate */ - writel(LCR_DLAB, BTLCR); - writel(quot & 0xff, BTDLL); - writel(quot >> 8, BTDLH); - writel(LCR_WLS0 | LCR_WLS1, BTLCR); + writel(reg, clk_reg); +} - writel(IER_UUE, BTIER); /* Enable BFUART */ +/* + * Enable clock and set baud rate, parity etc. + */ +void pxa_setbrg_dev(uint32_t uart_index) +{ + uint32_t divider = 0; + struct pxa_uart_regs *uart_regs; - break; + divider = pxa_uart_get_baud_divider(); + if (!divider) + hang(); - case STUART_INDEX: -#ifdef CONFIG_CPU_MONAHANS - writel(readl(CKENA) | CKENA_23_STUART, CKENA); -#else - writel(readl(CKEN) | CKEN5_STUART, CKEN); -#endif /* CONFIG_CPU_MONAHANS */ + uart_regs = pxa_uart_index_to_regs(uart_index); + if (!uart_regs) + hang(); - writel(0, STIER); - writel(0, STFCR); + pxa_uart_toggle_clock(uart_index, 1); - /* set baud rate */ - writel(LCR_DLAB, STLCR); - writel(quot & 0xff, STDLL); - writel(quot >> 8, STDLH); - writel(LCR_WLS0 | LCR_WLS1, STLCR); + /* Disable interrupts and FIFOs */ + writel(0, &uart_regs->ier); + writel(0, &uart_regs->fcr); - writel(IER_UUE, STIER); /* Enable STUART */ - break; + /* Set baud rate */ + writel(LCR_WLS0 | LCR_WLS1 | LCR_DLAB, &uart_regs->lcr); + writel(divider & 0xff, &uart_regs->dll); + writel(divider >> 8, &uart_regs->dlh); + writel(LCR_WLS0 | LCR_WLS1, &uart_regs->lcr); - default: - hang(); - } + /* Enable UART */ + writel(IER_UUE, &uart_regs->ier); } - /* * Initialise the serial port with the given baudrate. The settings * are always 8 data bits, no parity, 1 stop bit, no start bits. - * */ -int pxa_init_dev (unsigned int uart_index) +int pxa_init_dev(unsigned int uart_index) { pxa_setbrg_dev (uart_index); - - return (0); + return 0; } - /* * Output a single byte to the serial port. */ -void pxa_putc_dev (unsigned int uart_index,const char c) +void pxa_putc_dev(unsigned int uart_index, const char c) { - switch (uart_index) { - case FFUART_INDEX: - /* wait for room in the tx FIFO on FFUART */ - while ((readl(FFLSR) & LSR_TEMT) == 0) - WATCHDOG_RESET (); /* Reset HW Watchdog, if needed */ - writel(c, FFTHR); - break; - - case BTUART_INDEX: - while ((readl(BTLSR) & LSR_TEMT) == 0) - WATCHDOG_RESET (); /* Reset HW Watchdog, if needed */ - writel(c, BTTHR); - break; - - case STUART_INDEX: - while ((readl(STLSR) & LSR_TEMT) == 0) - WATCHDOG_RESET (); /* Reset HW Watchdog, if needed */ - writel(c, STTHR); - break; - } + struct pxa_uart_regs *uart_regs; + + uart_regs = pxa_uart_index_to_regs(uart_index); + if (!uart_regs) + hang(); + + while (!(readl(&uart_regs->lsr) & LSR_TEMT)) + WATCHDOG_RESET(); + writel(c, &uart_regs->thr); /* If \n, also do \r */ if (c == '\n') @@ -185,17 +200,15 @@ void pxa_putc_dev (unsigned int uart_index,const char c) * otherwise. When the function is succesfull, the character read is * written into its argument c. */ -int pxa_tstc_dev (unsigned int uart_index) +int pxa_tstc_dev(unsigned int uart_index) { - switch (uart_index) { - case FFUART_INDEX: - return readl(FFLSR) & LSR_DR; - case BTUART_INDEX: - return readl(BTLSR) & LSR_DR; - case STUART_INDEX: - return readl(STLSR) & LSR_DR; - } - return -1; + struct pxa_uart_regs *uart_regs; + + uart_regs = pxa_uart_index_to_regs(uart_index); + if (!uart_regs) + return -1; + + return readl(&uart_regs->lsr) & LSR_DR; } /* @@ -203,187 +216,86 @@ int pxa_tstc_dev (unsigned int uart_index) * otherwise. When the function is succesfull, the character read is * written into its argument c. */ -int pxa_getc_dev (unsigned int uart_index) +int pxa_getc_dev(unsigned int uart_index) { - switch (uart_index) { - case FFUART_INDEX: - while (!(readl(FFLSR) & LSR_DR)) - /* Reset HW Watchdog, if needed */ - WATCHDOG_RESET(); - return (char) readl(FFRBR) & 0xff; - - case BTUART_INDEX: - while (!(readl(BTLSR) & LSR_DR)) - /* Reset HW Watchdog, if needed */ - WATCHDOG_RESET(); - return (char) readl(BTRBR) & 0xff; - case STUART_INDEX: - while (!(readl(STLSR) & LSR_DR)) - /* Reset HW Watchdog, if needed */ - WATCHDOG_RESET(); - return (char) readl(STRBR) & 0xff; - } - return -1; -} + struct pxa_uart_regs *uart_regs; -void -pxa_puts_dev (unsigned int uart_index,const char *s) -{ - while (*s) { - pxa_putc_dev (uart_index,*s++); - } -} + uart_regs = pxa_uart_index_to_regs(uart_index); + if (!uart_regs) + return -1; -#if defined (CONFIG_FFUART) -static int ffuart_init(void) -{ - return pxa_init_dev(FFUART_INDEX); + while (!(readl(&uart_regs->lsr) & LSR_DR)) + WATCHDOG_RESET(); + return readl(&uart_regs->rbr) & 0xff; } -static void ffuart_setbrg(void) +void pxa_puts_dev(unsigned int uart_index, const char *s) { - return pxa_setbrg_dev(FFUART_INDEX); + while (*s) + pxa_putc_dev(uart_index, *s++); } -static void ffuart_putc(const char c) -{ - return pxa_putc_dev(FFUART_INDEX,c); -} - -static void ffuart_puts(const char *s) -{ - return pxa_puts_dev(FFUART_INDEX,s); -} - -static int ffuart_getc(void) -{ - return pxa_getc_dev(FFUART_INDEX); -} - -static int ffuart_tstc(void) -{ - return pxa_tstc_dev(FFUART_INDEX); -} - -struct serial_device serial_ffuart_device = -{ - "serial_ffuart", - ffuart_init, - NULL, - ffuart_setbrg, - ffuart_getc, - ffuart_tstc, - ffuart_putc, - ffuart_puts, -}; +#define pxa_uart(uart, UART) \ + int uart##_init(void) \ + { \ + return pxa_init_dev(UART##_INDEX); \ + } \ + \ + void uart##_setbrg(void) \ + { \ + return pxa_setbrg_dev(UART##_INDEX); \ + } \ + \ + void uart##_putc(const char c) \ + { \ + return pxa_putc_dev(UART##_INDEX, c); \ + } \ + \ + void uart##_puts(const char *s) \ + { \ + return pxa_puts_dev(UART##_INDEX, s); \ + } \ + \ + int uart##_getc(void) \ + { \ + return pxa_getc_dev(UART##_INDEX); \ + } \ + \ + int uart##_tstc(void) \ + { \ + return pxa_tstc_dev(UART##_INDEX); \ + } \ + +#define pxa_uart_desc(uart) \ + struct serial_device serial_##uart##_device = \ + { \ + "serial_"#uart, \ + uart##_init, \ + NULL, \ + uart##_setbrg, \ + uart##_getc, \ + uart##_tstc, \ + uart##_putc, \ + uart##_puts, \ + }; + +#define pxa_uart_multi(uart, UART) \ + pxa_uart(uart, UART) \ + pxa_uart_desc(uart) + +#if defined(CONFIG_HWUART) + pxa_uart_multi(hwuart, HWUART) #endif - -#if defined (CONFIG_BTUART) -static int btuart_init(void) -{ - return pxa_init_dev(BTUART_INDEX); -} - -static void btuart_setbrg(void) -{ - return pxa_setbrg_dev(BTUART_INDEX); -} - -static void btuart_putc(const char c) -{ - return pxa_putc_dev(BTUART_INDEX,c); -} - -static void btuart_puts(const char *s) -{ - return pxa_puts_dev(BTUART_INDEX,s); -} - -static int btuart_getc(void) -{ - return pxa_getc_dev(BTUART_INDEX); -} - -static int btuart_tstc(void) -{ - return pxa_tstc_dev(BTUART_INDEX); -} - -struct serial_device serial_btuart_device = -{ - "serial_btuart", - btuart_init, - NULL, - btuart_setbrg, - btuart_getc, - btuart_tstc, - btuart_putc, - btuart_puts, -}; +#if defined(CONFIG_STUART) + pxa_uart_multi(stuart, STUART) #endif - -#if defined (CONFIG_STUART) -static int stuart_init(void) -{ - return pxa_init_dev(STUART_INDEX); -} - -static void stuart_setbrg(void) -{ - return pxa_setbrg_dev(STUART_INDEX); -} - -static void stuart_putc(const char c) -{ - return pxa_putc_dev(STUART_INDEX,c); -} - -static void stuart_puts(const char *s) -{ - return pxa_puts_dev(STUART_INDEX,s); -} - -static int stuart_getc(void) -{ - return pxa_getc_dev(STUART_INDEX); -} - -static int stuart_tstc(void) -{ - return pxa_tstc_dev(STUART_INDEX); -} - -struct serial_device serial_stuart_device = -{ - "serial_stuart", - stuart_init, - NULL, - stuart_setbrg, - stuart_getc, - stuart_tstc, - stuart_putc, - stuart_puts, -}; +#if defined(CONFIG_FFUART) + pxa_uart_multi(ffuart, FFUART) +#endif +#if defined(CONFIG_BTUART) + pxa_uart_multi(btuart, BTUART) #endif - -#ifndef CONFIG_SERIAL_MULTI -inline int serial_init(void) { - return (pxa_init_dev(UART_INDEX)); -} -void serial_setbrg(void) { - pxa_setbrg_dev(UART_INDEX); -} -int serial_getc(void) { - return(pxa_getc_dev(UART_INDEX)); -} -int serial_tstc(void) { - return(pxa_tstc_dev(UART_INDEX)); -} -void serial_putc(const char c) { - pxa_putc_dev(UART_INDEX,c); -} -void serial_puts(const char *s) { - pxa_puts_dev(UART_INDEX,s); -} -#endif /* CONFIG_SERIAL_MULTI */ +#ifndef CONFIG_SERIAL_MULTI + pxa_uart(serial, UART) +#endif |