From a50adb7b4d86b924789dbe437ae92006d2f654f8 Mon Sep 17 00:00:00 2001 From: Francois Retief Date: Wed, 28 Oct 2015 10:35:12 +0200 Subject: sparc: Update LEON serial drivers to use readl/writel macros Update the LEON2/3 serial driver to make use of the readl and writel macros as well as the WATCHDOG_RESET() macro. Add readl/writel and friends to the asm/io.h file. Introduce the gd->arch.uart variable to store register address. Lastly, remove baudrate scaler macro variables from board config. It is now calculated in the serial driver using the global data variable. Signed-off-by: Francois Retief --- arch/sparc/cpu/leon2/serial.c | 125 +++++++++++++++++------------------ arch/sparc/cpu/leon3/prom.c | 5 +- arch/sparc/cpu/leon3/serial.c | 100 ++++++++++++++++------------ arch/sparc/include/asm/global_data.h | 1 + arch/sparc/include/asm/io.h | 64 ++++++++++-------- 5 files changed, 157 insertions(+), 138 deletions(-) (limited to 'arch/sparc') diff --git a/arch/sparc/cpu/leon2/serial.c b/arch/sparc/cpu/leon2/serial.c index 5cfbb9ed15..603364ee0b 100644 --- a/arch/sparc/cpu/leon2/serial.c +++ b/arch/sparc/cpu/leon2/serial.c @@ -1,72 +1,78 @@ /* GRLIB APBUART Serial controller driver * - * (C) Copyright 2008 - * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com. + * (C) Copyright 2008, 2015 + * Daniel Hellstrom, Cobham Gaisler, daniel@gaisler.com. * * SPDX-License-Identifier: GPL-2.0+ */ #include -#include -#include +#include #include -#include +#include DECLARE_GLOBAL_DATA_PTR; +static unsigned leon2_serial_calc_scaler(unsigned freq, unsigned baud) +{ + return (((freq*10) / (baud*8)) - 5) / 10; +} + static int leon2_serial_init(void) { - LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS; + LEON2_regs *leon2 = (LEON2_regs *)LEON2_PREGS; LEON2_Uart_regs *regs; unsigned int tmp; - /* Init LEON2 UART - * - * Set scaler / baud rate - * - * Receiver & transmitter enable - */ #if LEON2_CONSOLE_SELECT == LEON_CONSOLE_UART1 - regs = (LEON2_Uart_regs *) & leon2->UART_Channel_1; + regs = (LEON2_Uart_regs *)&leon2->UART_Channel_1; #else - regs = (LEON2_Uart_regs *) & leon2->UART_Channel_2; + regs = (LEON2_Uart_regs *)&leon2->UART_Channel_2; #endif - regs->UART_Scaler = CONFIG_SYS_LEON2_UART1_SCALER; + /* Set scaler / baud rate */ + tmp = leon2_serial_calc_scaler(CONFIG_SYS_CLK_FREQ, CONFIG_BAUDRATE); + writel(tmp, ®s->UART_Scaler); /* Let bit 11 be unchanged (debug bit for GRMON) */ - tmp = READ_WORD(regs->UART_Control); + tmp = readl(®s->UART_Control) & LEON2_UART_CTRL_DBG; + tmp |= (LEON2_UART1_LOOPBACK_ENABLE << 7); + tmp |= (LEON2_UART1_FLOWCTRL_ENABLE << 6); + tmp |= (LEON2_UART1_PARITY_ENABLE << 5); + tmp |= (LEON2_UART1_ODDPAR_ENABLE << 4); + /* Receiver & transmitter enable */ + tmp |= (LEON2_UART_CTRL_RE | LEON2_UART_CTRL_TE); + writel(tmp, ®s->UART_Control); + + gd->arch.uart = regs; + return 0; +} - regs->UART_Control = ((tmp & LEON2_UART_CTRL_DBG) | - (LEON2_UART1_LOOPBACK_ENABLE << 7) | - (LEON2_UART1_FLOWCTRL_ENABLE << 6) | - (LEON2_UART1_PARITY_ENABLE << 5) | - (LEON2_UART1_ODDPAR_ENABLE << 4) | - LEON2_UART_CTRL_RE | LEON2_UART_CTRL_TE); +static inline LEON2_Uart_regs *leon2_get_uart_regs(void) +{ + LEON2_Uart_regs *uart = gd->arch.uart; - return 0; + return uart; } static void leon2_serial_putc_raw(const char c) { - LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS; - LEON2_Uart_regs *regs; + LEON2_Uart_regs *uart = leon2_get_uart_regs(); -#if LEON2_CONSOLE_SELECT == LEON_CONSOLE_UART1 - regs = (LEON2_Uart_regs *) & leon2->UART_Channel_1; -#else - regs = (LEON2_Uart_regs *) & leon2->UART_Channel_2; -#endif + if (!uart) + return; /* Wait for last character to go. */ - while (!(READ_WORD(regs->UART_Status) & LEON2_UART_STAT_THE)) ; + while (!(readl(&uart->UART_Status) & LEON2_UART_STAT_THE)) + WATCHDOG_RESET(); /* Send data */ - regs->UART_Channel = c; + writel(c, &uart->UART_Channel); #ifdef LEON_DEBUG /* Wait for data to be sent */ - while (!(READ_WORD(regs->UART_Status) & LEON2_UART_STAT_TSE)) ; + while (!(readl(&uart->UART_Status) & LEON2_UART_STAT_TSE)) + WATCHDOG_RESET(); #endif } @@ -80,56 +86,43 @@ static void leon2_serial_putc(const char c) static int leon2_serial_getc(void) { - LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS; - LEON2_Uart_regs *regs; + LEON2_Uart_regs *uart = leon2_get_uart_regs(); -#if LEON2_CONSOLE_SELECT == LEON_CONSOLE_UART1 - regs = (LEON2_Uart_regs *) & leon2->UART_Channel_1; -#else - regs = (LEON2_Uart_regs *) & leon2->UART_Channel_2; -#endif + if (!uart) + return 0; /* Wait for a character to arrive. */ - while (!(READ_WORD(regs->UART_Status) & LEON2_UART_STAT_DR)) ; + while (!(readl(&uart->UART_Status) & LEON2_UART_STAT_DR)) + WATCHDOG_RESET(); - /* read data */ - return READ_WORD(regs->UART_Channel); + /* Read character data */ + return readl(&uart->UART_Channel); } static int leon2_serial_tstc(void) { - LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS; - LEON2_Uart_regs *regs; + LEON2_Uart_regs *uart = leon2_get_uart_regs(); -#if LEON2_CONSOLE_SELECT == LEON_CONSOLE_UART1 - regs = (LEON2_Uart_regs *) & leon2->UART_Channel_1; -#else - regs = (LEON2_Uart_regs *) & leon2->UART_Channel_2; -#endif + if (!uart) + return 0; - return (READ_WORD(regs->UART_Status) & LEON2_UART_STAT_DR); + return readl(&uart->UART_Status) & LEON2_UART_STAT_DR; } -/* set baud rate for uart */ static void leon2_serial_setbrg(void) { - /* update baud rate settings, read it from gd->baudrate */ + LEON2_Uart_regs *uart = leon2_get_uart_regs(); unsigned int scaler; - LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS; - LEON2_Uart_regs *regs; -#if LEON2_CONSOLE_SELECT == LEON_CONSOLE_UART1 - regs = (LEON2_Uart_regs *) & leon2->UART_Channel_1; -#else - regs = (LEON2_Uart_regs *) & leon2->UART_Channel_2; -#endif + if (!uart) + return; + + if (!gd->baudrate) + gd->baudrate = CONFIG_BAUDRATE; + + scaler = leon2_serial_calc_scaler(CONFIG_SYS_CLK_FREQ, CONFIG_BAUDRATE); - if (gd->baudrate > 0) { - scaler = - (((CONFIG_SYS_CLK_FREQ * 10) / (gd->baudrate * 8)) - - 5) / 10; - regs->UART_Scaler = scaler; - } + writel(scaler, &uart->UART_Scaler); } static struct serial_device leon2_serial_drv = { diff --git a/arch/sparc/cpu/leon3/prom.c b/arch/sparc/cpu/leon3/prom.c index b83776bc06..d0f18603a1 100644 --- a/arch/sparc/cpu/leon3/prom.c +++ b/arch/sparc/cpu/leon3/prom.c @@ -21,7 +21,8 @@ #define PRINT_ROM_VEC */ extern struct linux_romvec *kernel_arg_promvec; -extern ambapp_dev_apbuart *leon3_apbuart; + +DECLARE_GLOBAL_DATA_PTR; #define PROM_PGT __attribute__ ((__section__ (".prom.pgt"))) #define PROM_TEXT __attribute__ ((__section__ (".prom.text"))) @@ -909,7 +910,7 @@ void leon_prom_init(struct leon_prom_info *pspi) pspi->avail.num_bytes = pspi->totphys.num_bytes; /* Set the pointer to the Console UART in romvec */ - pspi->reloc_funcs.leon3_apbuart = leon3_apbuart; + pspi->reloc_funcs.leon3_apbuart = gd->arch.uart; { int j = 1; diff --git a/arch/sparc/cpu/leon3/serial.c b/arch/sparc/cpu/leon3/serial.c index bca6b6548b..f1dcab3377 100644 --- a/arch/sparc/cpu/leon3/serial.c +++ b/arch/sparc/cpu/leon3/serial.c @@ -1,66 +1,70 @@ /* GRLIB APBUART Serial controller driver * - * (C) Copyright 2007 - * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com. + * (C) Copyright 2007, 2015 + * Daniel Hellstrom, Cobham Gaisler, daniel@gaisler.com. * * SPDX-License-Identifier: GPL-2.0+ */ #include -#include -#include +#include #include #include -#include +#include DECLARE_GLOBAL_DATA_PTR; -ambapp_dev_apbuart *leon3_apbuart = NULL; - static int leon3_serial_init(void) { + ambapp_dev_apbuart *uart; ambapp_apbdev apbdev; unsigned int tmp; /* find UART */ - if (ambapp_apb_first(VENDOR_GAISLER, GAISLER_APBUART, &apbdev) == 1) { + if (ambapp_apb_first(VENDOR_GAISLER, GAISLER_APBUART, &apbdev) != 1) + return -1; /* didn't find hardware */ - leon3_apbuart = (ambapp_dev_apbuart *) apbdev.address; + /* found apbuart, let's init .. */ + uart = (ambapp_dev_apbuart *) apbdev.address; - /* found apbuart, let's init... - * - * Set scaler / baud rate - * - * Receiver & transmitter enable - */ - leon3_apbuart->scaler = CONFIG_SYS_GRLIB_APBUART_SCALER; + /* Set scaler / baud rate */ + tmp = (((CONFIG_SYS_CLK_FREQ*10) / (CONFIG_BAUDRATE*8)) - 5)/10; + writel(tmp, &uart->scaler); - /* Let bit 11 be unchanged (debug bit for GRMON) */ - tmp = READ_WORD(leon3_apbuart->ctrl); + /* Let bit 11 be unchanged (debug bit for GRMON) */ + tmp = readl(&uart->ctrl) & LEON_REG_UART_CTRL_DBG; + /* Receiver & transmitter enable */ + tmp |= LEON_REG_UART_CTRL_RE | LEON_REG_UART_CTRL_TE; + writel(tmp, &uart->ctrl); - leon3_apbuart->ctrl = ((tmp & LEON_REG_UART_CTRL_DBG) | - LEON_REG_UART_CTRL_RE | - LEON_REG_UART_CTRL_TE); + gd->arch.uart = uart; + return 0; +} - return 0; - } - return -1; /* didn't find hardware */ +static inline ambapp_dev_apbuart *leon3_get_uart_regs(void) +{ + ambapp_dev_apbuart *uart = gd->arch.uart; + return uart; } static void leon3_serial_putc_raw(const char c) { - if (!leon3_apbuart) + ambapp_dev_apbuart * const uart = leon3_get_uart_regs(); + + if (!uart) return; /* Wait for last character to go. */ - while (!(READ_WORD(leon3_apbuart->status) & LEON_REG_UART_STATUS_THE)) ; + while (!(readl(&uart->status) & LEON_REG_UART_STATUS_THE)) + WATCHDOG_RESET(); /* Send data */ - leon3_apbuart->data = c; + writel(c, &uart->data); #ifdef LEON_DEBUG /* Wait for data to be sent */ - while (!(READ_WORD(leon3_apbuart->status) & LEON_REG_UART_STATUS_TSE)) ; + while (!(readl(&uart->status) & LEON_REG_UART_STATUS_TSE)) + WATCHDOG_RESET(); #endif } @@ -74,36 +78,44 @@ static void leon3_serial_putc(const char c) static int leon3_serial_getc(void) { - if (!leon3_apbuart) + ambapp_dev_apbuart * const uart = leon3_get_uart_regs(); + + if (!uart) return 0; /* Wait for a character to arrive. */ - while (!(READ_WORD(leon3_apbuart->status) & LEON_REG_UART_STATUS_DR)) ; + while (!(readl(&uart->status) & LEON_REG_UART_STATUS_DR)) + WATCHDOG_RESET(); - /* read data */ - return READ_WORD(leon3_apbuart->data); + /* Read character data */ + return readl(&uart->data); } static int leon3_serial_tstc(void) { - if (leon3_apbuart) - return (READ_WORD(leon3_apbuart->status) & - LEON_REG_UART_STATUS_DR); - return 0; + ambapp_dev_apbuart * const uart = leon3_get_uart_regs(); + + if (!uart) + return 0; + + return readl(&uart->status) & LEON_REG_UART_STATUS_DR; } /* set baud rate for uart */ static void leon3_serial_setbrg(void) { - /* update baud rate settings, read it from gd->baudrate */ + ambapp_dev_apbuart * const uart = leon3_get_uart_regs(); unsigned int scaler; - if (leon3_apbuart && (gd->baudrate > 0)) { - scaler = - (((CONFIG_SYS_CLK_FREQ * 10) / (gd->baudrate * 8)) - - 5) / 10; - leon3_apbuart->scaler = scaler; - } - return; + + if (!uart) + return; + + if (!gd->baudrate) + gd->baudrate = CONFIG_BAUDRATE; + + scaler = (((CONFIG_SYS_CLK_FREQ*10) / (gd->baudrate*8)) - 5)/10; + + writel(scaler, &uart->scaler); } static struct serial_device leon3_serial_drv = { diff --git a/arch/sparc/include/asm/global_data.h b/arch/sparc/include/asm/global_data.h index 667e7d6d3b..0680a56758 100644 --- a/arch/sparc/include/asm/global_data.h +++ b/arch/sparc/include/asm/global_data.h @@ -15,6 +15,7 @@ /* Architecture-specific global data */ struct arch_global_data { + void *uart; }; #include diff --git a/arch/sparc/include/asm/io.h b/arch/sparc/include/asm/io.h index f7b89c890f..a317d132be 100644 --- a/arch/sparc/include/asm/io.h +++ b/arch/sparc/include/asm/io.h @@ -1,7 +1,7 @@ /* SPARC I/O definitions * - * (C) Copyright 2007 - * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com. + * (C) Copyright 2007, 2015 + * Daniel Hellstrom, Cobham Gaisler, daniel@gaisler.com. * * SPDX-License-Identifier: GPL-2.0+ */ @@ -12,45 +12,57 @@ /* Nothing to sync, total store ordering (TSO)... */ #define sync() +/* + * Generic virtual read/write. + */ + +#ifndef CONFIG_SYS_HAS_NO_CACHE + /* Forces a cache miss on read/load. * On some architectures we need to bypass the cache when reading * I/O registers so that we are not reading the same status word * over and over again resulting in a hang (until an IRQ if lucky) - * */ -#ifndef CONFIG_SYS_HAS_NO_CACHE -#define READ_BYTE(var) SPARC_NOCACHE_READ_BYTE((unsigned int)(var)) -#define READ_HWORD(var) SPARC_NOCACHE_READ_HWORD((unsigned int)(var)) -#define READ_WORD(var) SPARC_NOCACHE_READ((unsigned int)(var)) -#define READ_DWORD(var) SPARC_NOCACHE_READ_DWORD((unsigned int)(var)) + +#define __arch_getb(a) SPARC_NOCACHE_READ_BYTE((unsigned int)(a)) +#define __arch_getw(a) SPARC_NOCACHE_READ_HWORD((unsigned int)(a)) +#define __arch_getl(a) SPARC_NOCACHE_READ((unsigned int)(a)) +#define __arch_getq(a) SPARC_NOCACHE_READ_DWORD((unsigned int)(a)) + #else -#define READ_BYTE(var) (var) -#define READ_HWORD(var) (var) -#define READ_WORD(var) (var) -#define READ_DWORD(var) (var) -#endif -/* - * Generic virtual read/write. - */ -#define __arch_getb(a) (READ_BYTE(a)) -#define __arch_getw(a) (READ_HWORD(a)) -#define __arch_getl(a) (READ_WORD(a)) -#define __arch_getq(a) (READ_DWORD(a)) +#define __arch_getb(a) (*(volatile unsigned char *)(a)) +#define __arch_getw(a) (*(volatile unsigned short *)(a)) +#define __arch_getl(a) (*(volatile unsigned int *)(a)) +#define __arch_getq(a) (*(volatile unsigned long long *)(a)) + +#endif /* CONFIG_SYS_HAS_NO_CACHE */ -#define __arch_putb(v,a) (*(volatile unsigned char *)(a) = (v)) -#define __arch_putw(v,a) (*(volatile unsigned short *)(a) = (v)) -#define __arch_putl(v,a) (*(volatile unsigned int *)(a) = (v)) +#define __arch_putb(v, a) (*(volatile unsigned char *)(a) = (v)) +#define __arch_putw(v, a) (*(volatile unsigned short *)(a) = (v)) +#define __arch_putl(v, a) (*(volatile unsigned int *)(a) = (v)) +#define __arch_putq(v, a) (*(volatile unsigned long long *)(a) = (v)) -#define __raw_writeb(v,a) __arch_putb(v,a) -#define __raw_writew(v,a) __arch_putw(v,a) -#define __raw_writel(v,a) __arch_putl(v,a) +#define __raw_writeb(v, a) __arch_putb(v, a) +#define __raw_writew(v, a) __arch_putw(v, a) +#define __raw_writel(v, a) __arch_putl(v, a) +#define __raw_writeq(v, a) __arch_putq(v, a) #define __raw_readb(a) __arch_getb(a) #define __raw_readw(a) __arch_getw(a) #define __raw_readl(a) __arch_getl(a) #define __raw_readq(a) __arch_getq(a) +#define writeb __raw_writeb +#define writew __raw_writew +#define writel __raw_writel +#define writeq __raw_writeq + +#define readb __raw_readb +#define readw __raw_readw +#define readl __raw_readl +#define readq __raw_readq + /* * Given a physical address and a length, return a virtual address * that can be used to access the memory range with the caching -- cgit v1.2.1