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[adm8668] get rid of the specific UART driver and use AMBA PL010

Browse Source 
Signed-off-by: Florian Fainelli <florian@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@34548 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
florian
2012-12-06 22:39:43 +00:00
parent dd2f766913
commit aa9eec732f
13 changed files with 566 additions and 712 deletions
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2
target/linux/adm8668/files/arch/mips/adm8668/Kconfig Normal file
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@@ -0,0 +1,2 @@
config ARM_AMBA
def_bool y

4
target/linux/adm8668/files/arch/mips/adm8668/Makefile
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@@ -2,6 +2,6 @@
# something witty --neutronscott
#
obj-y := irq.o pci.o prom.o platform.o serial.o proc.o \
setup.o time.o early_printk.o \
obj-y := irq.o pci.o prom.o platform.o proc.o \
setup.o time.o early_printk.o clock.o \
net_core.o net_intr.o

56
target/linux/adm8668/files/arch/mips/adm8668/clock.c Normal file
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@@ -0,0 +1,56 @@
/*
* ADM8668 minimal clock support
*
* Copyright (C) 2012, Florian Fainelli <florian@openwrt.org>
*
* Licensed under the terms of the GPLv2
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <adm8668.h>
struct clk {
unsigned long rate;
};
static struct clk uart_clk = {
.rate = ADM8668_UARTCLK_FREQ,
};
struct clk *clk_get(struct device *dev, const char *id)
{
const char *name = dev_name(dev);
if (!strcmp(name, "apb:uart0"))
return &uart_clk;
return ERR_PTR(-ENOENT);
}
EXPORT_SYMBOL(clk_get);
int clk_enable(struct clk *clk)
{
return 0;
}
EXPORT_SYMBOL(clk_enable);
void clk_disable(struct clk *clk)
{
}
EXPORT_SYMBOL(clk_disable);
unsigned long clk_get_rate(struct clk *clk)
{
return clk->rate;
}
EXPORT_SYMBOL(clk_get_rate);
void clk_put(struct clk *clk)
{
}
EXPORT_SYMBOL(clk_put);

43
target/linux/adm8668/files/arch/mips/adm8668/platform.c
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@@ -1,5 +1,6 @@
/*
* Copyright (C) 2010 Scott Nicholas <neutronscott@scottn.us>
* Copyright (C) 2012 Florian Fainelli <florian@openwrt.org>
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
@@ -13,6 +14,9 @@
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/amba/bus.h>
#include <linux/amba/serial.h>
#include <asm/reboot.h>
#include <asm/time.h>
#include <asm/addrspace.h>
@@ -20,23 +24,31 @@
#include <asm/io.h>
#include <adm8668.h>
static struct resource uart_resources[] = {
{
static void adm8668_uart_set_mctrl(struct amba_device *dev,
void __iomem *base,
unsigned int mcrtl)
{
}
static struct amba_pl010_data adm8668_uart0_data = {
.set_mctrl = adm8668_uart_set_mctrl,
};
static struct amba_device adm8668_uart0_device = {
.dev = {
.init_name = "apb:uart0",
.platform_data = &adm8668_uart0_data,
},
.res = {
.start = ADM8668_UART0_BASE,
.end = ADM8668_UART0_BASE + 0xF,
.flags = IORESOURCE_MEM,
},
{
.start = INT_LVL_UART0,
.flags = IORESOURCE_IRQ,
.irq = {
INT_LVL_UART0,
-1
},
};
static struct platform_device adm8668_uart_device = {
.name = "adm8668_uart",
.id = 0,
.resource = uart_resources,
.num_resources = ARRAY_SIZE(uart_resources),
.periphid = 0x0041010,
};
static struct resource eth0_resources[] = {
@@ -78,13 +90,18 @@ static struct platform_device adm8668_eth1_device = {
};
static struct platform_device *adm8668_devs[] = {
&adm8668_uart_device,
&adm8668_eth0_device,
&adm8668_eth1_device,
};
int __devinit adm8668_devs_register(void)
{
int ret;
ret = amba_device_register(&adm8668_uart0_device, &iomem_resource);
if (ret)
panic("failed to register AMBA UART");
return platform_add_devices(adm8668_devs, ARRAY_SIZE(adm8668_devs));
}
arch_initcall(adm8668_devs_register);

638
target/linux/adm8668/files/arch/mips/adm8668/serial.c
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@@ -1,638 +0,0 @@
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* ADM8668 serial driver, totally ripped the source from BCM63xx and changed
* all the registers to fit our hardware, and removed all the features that
* I didn't know because our GPL'd serial driver was way lame.
*
* Copyright (C) 2010 Scott Nicholas <neutronscott@scottn.us>
* Derived directly from bcm63xx_uart
* Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
*
*/
#if defined(CONFIG_SERIAL_ADM8668_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/console.h>
#include <linux/clk.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/sysrq.h>
#include <linux/serial.h>
#include <linux/serial_core.h>
#include <adm8668.h>
#define ADM8668_NR_UARTS 1
static struct uart_port ports[ADM8668_NR_UARTS];
/*
* handy uart register accessor
*/
static inline unsigned int adm_uart_readl(struct uart_port *port,
unsigned int offset)
{
return (*(volatile unsigned int *)(port->membase + offset));
}
static inline void adm_uart_writel(struct uart_port *port,
unsigned int value, unsigned int offset)
{
(*((volatile unsigned int *)(port->membase + offset))) = value;
}
/*
* serial core request to check if uart tx fifo is empty
*/
static unsigned int adm_uart_tx_empty(struct uart_port *port)
{
/* we always wait for completion, no buffer is made... */
return 1;
}
/*
* serial core request to set RTS and DTR pin state and loopback mode
*/
static void adm_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
}
/*
* serial core request to return RI, CTS, DCD and DSR pin state
*/
static unsigned int adm_uart_get_mctrl(struct uart_port *port)
{
return 0;
}
/*
* serial core request to disable tx ASAP (used for flow control)
*/
static void adm_uart_stop_tx(struct uart_port *port)
{
unsigned int val;
val = adm_uart_readl(port, UART_CR_REG);
val &= ~(UART_TX_INT_EN);
adm_uart_writel(port, val, UART_CR_REG);
}
/*
* serial core request to (re)enable tx
*/
static void adm_uart_start_tx(struct uart_port *port)
{
unsigned int val;
val = adm_uart_readl(port, UART_CR_REG);
val |= UART_TX_INT_EN;
adm_uart_writel(port, val, UART_CR_REG);
}
/*
* serial core request to stop rx, called before port shutdown
*/
static void adm_uart_stop_rx(struct uart_port *port)
{
unsigned int val;
val = adm_uart_readl(port, UART_CR_REG);
val &= ~UART_RX_INT_EN;
adm_uart_writel(port, val, UART_CR_REG);
}
/*
* serial core request to enable modem status interrupt reporting
*/
static void adm_uart_enable_ms(struct uart_port *port)
{
}
/*
* serial core request to start/stop emitting break char
*/
static void adm_uart_break_ctl(struct uart_port *port, int ctl)
{
}
/*
* return port type in string format
*/
static const char *adm_uart_type(struct uart_port *port)
{
return (port->type == PORT_ADM8668) ? "adm8668_uart" : NULL;
}
/*
* read all chars in rx fifo and send them to core
*/
static void adm_uart_do_rx(struct uart_port *port)
{
struct tty_struct *tty;
unsigned int max_count;
/* limit number of char read in interrupt, should not be
* higher than fifo size anyway since we're much faster than
* serial port */
max_count = 32;
tty = port->state->port.tty;
do {
unsigned int iestat, c, cstat;
char flag;
/* get overrun/fifo empty information from ier
* register */
iestat = adm_uart_readl(port, UART_FR_REG);
if (iestat & UART_RX_FIFO_EMPTY)
break;
/* recieve status */
cstat = adm_uart_readl(port, UART_RSR_REG);
/* clear errors */
adm_uart_writel(port, cstat, UART_RSR_REG);
c = adm_uart_readl(port, UART_DR_REG);
port->icount.rx++;
flag = TTY_NORMAL;
if (unlikely((cstat & UART_RX_STATUS_MASK))) {
/* do stats first */
if (cstat & UART_BREAK_ERR) {
port->icount.brk++;
if (uart_handle_break(port))
continue;
}
if (cstat & UART_PARITY_ERR)
port->icount.parity++;
if (cstat & UART_FRAMING_ERR)
port->icount.frame++;
if (cstat & UART_OVERRUN_ERR) {
port->icount.overrun++;
tty_insert_flip_char(tty, 0, TTY_OVERRUN);
}
/* update flag wrt read_status_mask */
cstat &= port->read_status_mask;
if (cstat & UART_BREAK_ERR)
flag = TTY_BREAK;
if (cstat & UART_FRAMING_ERR)
flag = TTY_FRAME;
if (cstat & UART_PARITY_ERR)
flag = TTY_PARITY;
}
if (uart_handle_sysrq_char(port, c))
continue;
/* fixthis */
if ((cstat & port->ignore_status_mask) == 0)
tty_insert_flip_char(tty, c, flag);
} while (max_count--);
tty_flip_buffer_push(tty);
}
/*
* fill tx fifo with chars to send, stop when fifo is about to be full
* or when all chars have been sent.
*/
static void adm_uart_do_tx(struct uart_port *port)
{
struct circ_buf *xmit;
if (port->x_char) {
adm_uart_writel(port, port->x_char, UART_DR_REG);
port->icount.tx++;
port->x_char = 0;
return;
}
if (uart_tx_stopped(port))
adm_uart_stop_tx(port);
xmit = &port->state->xmit;
if (uart_circ_empty(xmit))
goto txq_empty;
do
{
while ((adm_uart_readl(port, UART_FR_REG) & UART_TX_FIFO_FULL) != 0)
;
adm_uart_writel(port, xmit->buf[xmit->tail], UART_DR_REG);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
port->icount.tx++;
if (uart_circ_empty(xmit))
break;
} while (1);
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
if (uart_circ_empty(xmit))
goto txq_empty;
return;
txq_empty:
adm_uart_stop_tx(port);
}
/*
* process uart interrupt
*/
static irqreturn_t adm_uart_interrupt(int irq, void *dev_id)
{
struct uart_port *port;
unsigned int irqstat;
port = dev_id;
spin_lock(&port->lock);
irqstat = adm_uart_readl(port, UART_IIR_REG);
if (irqstat & (UART_RX_INT|UART_RX_TIMEOUT_INT)) {
adm_uart_do_rx(port);
}
if (irqstat & UART_TX_INT) {
adm_uart_do_tx(port);
}
spin_unlock(&port->lock);
return IRQ_HANDLED;
}
/*
* enable rx & tx operation on uart
*/
static void adm_uart_enable(struct uart_port *port)
{
unsigned int val;
val = adm_uart_readl(port, UART_CR_REG);
// BREAK_INT too
val |= (UART_RX_INT_EN | UART_RX_TIMEOUT_INT_EN);
adm_uart_writel(port, val, UART_CR_REG);
}
/*
* disable rx & tx operation on uart
*/
static void adm_uart_disable(struct uart_port *port)
{
unsigned int val;
val = adm_uart_readl(port, UART_CR_REG);
val &= ~(UART_TX_INT_EN | UART_RX_INT_EN | UART_RX_TIMEOUT_INT_EN);
adm_uart_writel(port, val, UART_CR_REG);
}
/*
* clear all unread data in rx fifo and unsent data in tx fifo
*/
static void adm_uart_flush(struct uart_port *port)
{
/* read any pending char to make sure all irq status are
* cleared */
(void)adm_uart_readl(port, UART_DR_REG);
}
/*
* serial core request to initialize uart and start rx operation
*/
static int adm_uart_startup(struct uart_port *port)
{
int ret;
/* clear any pending external input interrupt */
(void)adm_uart_readl(port, UART_IIR_REG);
/* register irq and enable rx interrupts */
ret = request_irq(port->irq, adm_uart_interrupt, 0,
adm_uart_type(port), port);
if (ret)
return ret;
adm_uart_enable(port);
return 0;
}
/*
* serial core request to flush & disable uart
*/
static void adm_uart_shutdown(struct uart_port *port)
{
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
// adm_uart_writel(port, 0, UART_CR_REG);
spin_unlock_irqrestore(&port->lock, flags);
adm_uart_disable(port);
adm_uart_flush(port);
free_irq(port->irq, port);
}
/*
* serial core request to change current uart setting
*/
static void adm_uart_set_termios(struct uart_port *port,
struct ktermios *new,
struct ktermios *old)
{
port->ignore_status_mask = 0;
uart_update_timeout(port, new->c_cflag, 115200);
}
/*
* serial core request to claim uart iomem
*/
static int adm_uart_request_port(struct uart_port *port)
{
unsigned int size = 0xf;
if (!request_mem_region(port->mapbase, size, "adm8668")) {
dev_err(port->dev, "Memory region busy\n");
return -EBUSY;
}
port->membase = ioremap(port->mapbase, size);
if (!port->membase) {
dev_err(port->dev, "Unable to map registers\n");
release_mem_region(port->mapbase, size);
return -EBUSY;
}
return 0;
}
/*
* serial core request to release uart iomem
*/
static void adm_uart_release_port(struct uart_port *port)
{
release_mem_region(port->mapbase, 0xf);
iounmap(port->membase);
}
/*
* serial core request to do any port required autoconfiguration
*/
static void adm_uart_config_port(struct uart_port *port, int flags)
{
if (flags & UART_CONFIG_TYPE) {
if (adm_uart_request_port(port))
return;
port->type = PORT_ADM8668;
}
}
/*
* serial core request to check that port information in serinfo are
* suitable
*/
static int adm_uart_verify_port(struct uart_port *port,
struct serial_struct *serinfo)
{
if (port->type != PORT_ADM8668)
return -EINVAL;
if (port->irq != serinfo->irq)
return -EINVAL;
if (port->iotype != serinfo->io_type)
return -EINVAL;
if (port->mapbase != (unsigned long)serinfo->iomem_base)
return -EINVAL;
return 0;
}
/* serial core callbacks */
static struct uart_ops adm_uart_ops = {
.tx_empty = adm_uart_tx_empty,
.get_mctrl = adm_uart_get_mctrl,
.set_mctrl = adm_uart_set_mctrl,
.start_tx = adm_uart_start_tx,
.stop_tx = adm_uart_stop_tx,
.stop_rx = adm_uart_stop_rx,
.enable_ms = adm_uart_enable_ms,
.break_ctl = adm_uart_break_ctl,
.startup = adm_uart_startup,
.shutdown = adm_uart_shutdown,
.set_termios = adm_uart_set_termios,
.type = adm_uart_type,
.release_port = adm_uart_release_port,
.request_port = adm_uart_request_port,
.config_port = adm_uart_config_port,
.verify_port = adm_uart_verify_port,
};
#ifdef CONFIG_SERIAL_ADM8668_CONSOLE
static inline void wait_for_xmitr(struct uart_port *port)
{
while ((adm_uart_readl(port, UART_FR_REG) & UART_TX_FIFO_FULL) != 0)
;
}
/*
* output given char
*/
static void adm_console_putchar(struct uart_port *port, int ch)
{
wait_for_xmitr(port);
adm_uart_writel(port, ch, UART_DR_REG);
}
/*
* console core request to output given string
*/
static void adm_console_write(struct console *co, const char *s,
unsigned int count)
{
struct uart_port *port;
unsigned long flags;
int locked;
port = &ports[co->index];
local_irq_save(flags);
if (port->sysrq) {
/* adm_uart_interrupt() already took the lock */
locked = 0;
} else if (oops_in_progress) {
locked = spin_trylock(&port->lock);
} else {
spin_lock(&port->lock);
locked = 1;
}
/* call helper to deal with \r\n */
uart_console_write(port, s, count, adm_console_putchar);
/* and wait for char to be transmitted */
wait_for_xmitr(port);
if (locked)
spin_unlock(&port->lock);
local_irq_restore(flags);
}
/*
* console core request to setup given console, find matching uart
* port and setup it.
*/
static int adm_console_setup(struct console *co, char *options)
{
struct uart_port *port;
int baud = 115200;
int bits = 8;
int parity = 'n';
int flow = 'n';
if (co->index < 0 || co->index >= ADM8668_NR_UARTS)
return -EINVAL;
port = &ports[co->index];
if (!port->membase)
return -ENODEV;
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
return uart_set_options(port, co, baud, parity, bits, flow);
}
static struct uart_driver adm_uart_driver;
static struct console adm8668_console = {
.name = "ttyS",
.write = adm_console_write,
.device = uart_console_device,
.setup = adm_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &adm_uart_driver,
};
static int __init adm8668_console_init(void)
{
register_console(&adm8668_console);
return 0;
}
console_initcall(adm8668_console_init);
#define ADM8668_CONSOLE (&adm8668_console)
#else
#define ADM8668_CONSOLE NULL
#endif /* CONFIG_SERIAL_ADM8668_CONSOLE */
static struct uart_driver adm_uart_driver = {
.owner = THIS_MODULE,
.driver_name = "adm8668_uart",
.dev_name = "ttyS",
.major = TTY_MAJOR,
.minor = 64,
.nr = 1,
.cons = ADM8668_CONSOLE,
};
/*
* platform driver probe/remove callback
*/
static int __devinit adm_uart_probe(struct platform_device *pdev)
{
struct resource *res_mem, *res_irq;
struct uart_port *port;
int ret;
if (pdev->id < 0 || pdev->id >= ADM8668_NR_UARTS)
return -EINVAL;
if (ports[pdev->id].membase)
return -EBUSY;
res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res_mem)
return -ENODEV;
res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (!res_irq)
return -ENODEV;
port = &ports[pdev->id];
memset(port, 0, sizeof(*port));
port->iotype = UPIO_MEM;
port->mapbase = res_mem->start;
port->irq = res_irq->start;
port->ops = &adm_uart_ops;
port->flags = UPF_BOOT_AUTOCONF;
port->dev = &pdev->dev;
port->fifosize = 8;
port->uartclk = ADM8668_UARTCLK_FREQ;
ret = uart_add_one_port(&adm_uart_driver, port);
if (ret) {
ports[pdev->id].membase = 0;
return ret;
}
platform_set_drvdata(pdev, port);
return 0;
}
static int __devexit adm_uart_remove(struct platform_device *pdev)
{
struct uart_port *port;
port = platform_get_drvdata(pdev);
uart_remove_one_port(&adm_uart_driver, port);
platform_set_drvdata(pdev, NULL);
/* mark port as free */
ports[pdev->id].membase = 0;
return 0;
}
/*
* platform driver stuff
*/
static struct platform_driver adm_uart_platform_driver = {
.probe = adm_uart_probe,
.remove = __devexit_p(adm_uart_remove),
.driver = {
.owner = THIS_MODULE,
.name = "adm8668_uart",
},
};
static int __init adm_uart_init(void)
{
int ret;
ret = uart_register_driver(&adm_uart_driver);
if (ret)
return ret;
ret = platform_driver_register(&adm_uart_platform_driver);
if (ret)
uart_unregister_driver(&adm_uart_driver);
return ret;
}
static void __exit adm_uart_exit(void)
{
platform_driver_unregister(&adm_uart_platform_driver);
uart_unregister_driver(&adm_uart_driver);
}
module_init(adm_uart_init);
module_exit(adm_uart_exit);
MODULE_AUTHOR("Scott Nicholas <neutronscott@scottn.us>");
MODULE_DESCRIPTION("ADM8668 integrated uart driver");
MODULE_LICENSE("GPL");

56
target/linux/adm8668/files/arch/mips/include/asm/mach-adm8668/asm/sizes.h Normal file
View File

@@ -0,0 +1,56 @@
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* DO NOT EDIT!! - this file automatically generated
* from .s file by awk -f s2h.awk
*/
/* Size definitions
* Copyright (C) ARM Limited 1998. All rights reserved.
*/
#ifndef __sizes_h
#define __sizes_h 1
/* handy sizes */
#define SZ_16 0x00000010
#define SZ_256 0x00000100
#define SZ_512 0x00000200
#define SZ_1K 0x00000400
#define SZ_4K 0x00001000
#define SZ_8K 0x00002000
#define SZ_16K 0x00004000
#define SZ_64K 0x00010000
#define SZ_128K 0x00020000
#define SZ_256K 0x00040000
#define SZ_512K 0x00080000
#define SZ_1M 0x00100000
#define SZ_2M 0x00200000
#define SZ_4M 0x00400000
#define SZ_8M 0x00800000
#define SZ_16M 0x01000000
#define SZ_32M 0x02000000
#define SZ_64M 0x04000000
#define SZ_128M 0x08000000
#define SZ_256M 0x10000000
#define SZ_512M 0x20000000
#define SZ_1G 0x40000000
#define SZ_2G 0x80000000
#endif
/* END */