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sparc: Update LEON serial drivers to use readl/writel macros

Browse Source 
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 <fgretief@spaceteq.co.za>
This commit is contained in:
Francois Retief 2015-10-28 10:35:12 +02:00
parent c33759aebd
commit a50adb7b4d
10 changed files with 157 additions and 158 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

125
arch/sparc/cpu/leon2/serial.c
View File

@ -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 <common.h>
#include <asm/processor.h>
#include <asm/leon.h>
#include <asm/io.h>
#include <serial.h>
#include <linux/compiler.h>
#include <watchdog.h>
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, &regs->UART_Scaler);
/* Let bit 11 be unchanged (debug bit for GRMON) */
tmp = READ_WORD(regs->UART_Control);
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);
tmp = readl(&regs->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, &regs->UART_Control);
gd->arch.uart = regs;
return 0;
}
static inline LEON2_Uart_regs *leon2_get_uart_regs(void)
{
LEON2_Uart_regs *uart = gd->arch.uart;
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 > 0) {
scaler =
(((CONFIG_SYS_CLK_FREQ * 10) / (gd->baudrate * 8)) -
5) / 10;
regs->UART_Scaler = scaler;
}
if (!gd->baudrate)
gd->baudrate = CONFIG_BAUDRATE;
scaler = leon2_serial_calc_scaler(CONFIG_SYS_CLK_FREQ, CONFIG_BAUDRATE);
writel(scaler, &uart->UART_Scaler);
}
static struct serial_device leon2_serial_drv = {

5
arch/sparc/cpu/leon3/prom.c
View File

@ -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;

100
arch/sparc/cpu/leon3/serial.c
View File

@ -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 <common.h>
#include <asm/processor.h>
#include <asm/leon.h>
#include <asm/io.h>
#include <ambapp.h>
#include <serial.h>
#include <linux/compiler.h>
#include <watchdog.h>
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 = {

1
arch/sparc/include/asm/global_data.h
View File

@ -15,6 +15,7 @@
/* Architecture-specific global data */
struct arch_global_data {
void *uart;
};
#include <asm-generic/global_data.h>

64
arch/sparc/include/asm/io.h
View File

@ -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))
#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))
#endif /* CONFIG_SYS_HAS_NO_CACHE */
#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 __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_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

4
include/configs/gr_cpci_ax2000.h
View File

@ -342,10 +342,6 @@
#define CONFIG_SYS_GRLIB_DDR2_CFG1 0x00000000
#define CONFIG_SYS_GRLIB_DDR2_CFG3 0x00000000
/* Calculate scaler register value from default baudrate */
#define CONFIG_SYS_GRLIB_APBUART_SCALER \
((((CONFIG_SYS_CLK_FREQ*10)/(CONFIG_BAUDRATE*8))-5)/10)
/* Identification string */
#define CONFIG_IDENT_STRING "GAISLER LEON3 GR-CPCI-AX2000"

4
include/configs/gr_ep2s60.h
View File

@ -309,10 +309,6 @@
#define CONFIG_SYS_GRLIB_DDR2_CFG1 0x00000000
#define CONFIG_SYS_GRLIB_DDR2_CFG3 0x00000000
/* Calculate scaler register value from default baudrate */
#define CONFIG_SYS_GRLIB_APBUART_SCALER \
((((CONFIG_SYS_CLK_FREQ*10)/(CONFIG_BAUDRATE*8))-5)/10)
/* Identification string */
#define CONFIG_IDENT_STRING "GAISLER LEON3 EP2S60"

4
include/configs/gr_xc3s_1500.h
View File

@ -274,10 +274,6 @@
#define CONFIG_SYS_GRLIB_DDR2_CFG1 0x00000000
#define CONFIG_SYS_GRLIB_DDR2_CFG3 0x00000000
/* Calculate scaler register value from default baudrate */
#define CONFIG_SYS_GRLIB_APBUART_SCALER \
((((CONFIG_SYS_CLK_FREQ*10)/(CONFIG_BAUDRATE*8))-5)/10)
/* Identification string */
#define CONFIG_IDENT_STRING "GAISLER LEON3 GR-XC3S-1500"

3
include/configs/grsim.h
View File

@ -280,9 +280,6 @@
#define CONFIG_SYS_GRLIB_DDR2_CFG1 0x00000000
#define CONFIG_SYS_GRLIB_DDR2_CFG3 0x00000000
#define CONFIG_SYS_GRLIB_APBUART_SCALER \
((((CONFIG_SYS_CLK_FREQ*10)/(CONFIG_BAUDRATE*8))-5)/10)
/* default kernel command line */
#define CONFIG_DEFAULT_KERNEL_COMMAND_LINE "console=ttyS0,38400\0\0"

5
include/configs/grsim_leon2.h
View File

@ -264,8 +264,6 @@
#define CONFIG_SYS_GRLIB_MEMCFG3 0x00136000
/*** LEON2 UART 1 ***/
#define CONFIG_SYS_LEON2_UART1_SCALER \
((((CONFIG_SYS_CLK_FREQ*10)/(CONFIG_BAUDRATE*8))-5)/10)
/* UART1 Define to 1 or 0 */
#define LEON2_UART1_LOOPBACK_ENABLE 0
@ -275,9 +273,6 @@
/*** LEON2 UART 2 ***/
#define CONFIG_SYS_LEON2_UART2_SCALER \
((((CONFIG_SYS_CLK_FREQ*10)/(CONFIG_BAUDRATE*8))-5)/10)
/* UART2 Define to 1 or 0 */
#define LEON2_UART2_LOOPBACK_ENABLE 0
#define LEON2_UART2_FLOWCTRL_ENABLE 0