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/*
* arch/arm/mach-tegra/fiq_debugger.c
*
* Serial Debugger Interface for Tegra
*
* Copyright (C) 2008 Google, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*/
#include <stdarg.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/irq.h>
#include <linux/serial_reg.h>
#include <linux/slab.h>
#include <linux/stacktrace.h>
#include <asm/fiq_debugger.h>
#include <mach/tegra_fiq_debugger.h>
#include <mach/system.h>
#include <mach/fiq.h>
#include <linux/uaccess.h>
#include <mach/legacy_irq.h>
struct tegra_fiq_debugger {
struct fiq_debugger_pdata pdata;
void __iomem *debug_port_base;
bool break_seen;
};
static inline void tegra_write(struct tegra_fiq_debugger *t,
unsigned int val, unsigned int off)
{
__raw_writeb(val, t->debug_port_base + off * 4);
}
static inline unsigned int tegra_read(struct tegra_fiq_debugger *t,
unsigned int off)
{
return __raw_readb(t->debug_port_base + off * 4);
}
static inline unsigned int tegra_read_lsr(struct tegra_fiq_debugger *t)
{
unsigned int lsr;
lsr = tegra_read(t, UART_LSR);
if (lsr & UART_LSR_BI)
t->break_seen = true;
return lsr;
}
static int debug_port_init(struct platform_device *pdev)
{
struct tegra_fiq_debugger *t;
t = container_of(dev_get_platdata(&pdev->dev), typeof(*t), pdata);
if (tegra_read(t, UART_LSR) & UART_LSR_DR)
(void)tegra_read(t, UART_RX);
/* enable rx and lsr interrupt */
tegra_write(t, UART_IER_RLSI | UART_IER_RDI, UART_IER);
/* interrupt on every character */
tegra_write(t, 0, UART_IIR);
return 0;
}
static int debug_getc(struct platform_device *pdev)
{
unsigned int lsr;
struct tegra_fiq_debugger *t;
t = container_of(dev_get_platdata(&pdev->dev), typeof(*t), pdata);
lsr = tegra_read_lsr(t);
if (lsr & UART_LSR_BI || t->break_seen) {
t->break_seen = false;
return FIQ_DEBUGGER_BREAK;
}
if (lsr & UART_LSR_DR)
return tegra_read(t, UART_RX);
return FIQ_DEBUGGER_NO_CHAR;
}
static void debug_putc(struct platform_device *pdev, unsigned int c)
{
struct tegra_fiq_debugger *t;
t = container_of(dev_get_platdata(&pdev->dev), typeof(*t), pdata);
while (!(tegra_read_lsr(t) & UART_LSR_THRE))
cpu_relax();
tegra_write(t, c, UART_TX);
}
static void debug_flush(struct platform_device *pdev)
{
struct tegra_fiq_debugger *t;
t = container_of(dev_get_platdata(&pdev->dev), typeof(*t), pdata);
while (!(tegra_read_lsr(t) & UART_LSR_TEMT))
cpu_relax();
}
static void fiq_enable(struct platform_device *pdev, unsigned int irq, bool on)
{
if (on)
tegra_fiq_enable(irq);
else
tegra_fiq_disable(irq);
}
static int tegra_fiq_debugger_id;
void tegra_serial_debug_init(unsigned int base, int irq,
struct clk *clk, int signal_irq, int wakeup_irq)
{
struct tegra_fiq_debugger *t;
struct platform_device *pdev;
struct resource *res;
int res_count;
t = kzalloc(sizeof(struct tegra_fiq_debugger), GFP_KERNEL);
if (!t) {
pr_err("Failed to allocate for fiq debugger\n");
return;
}
t->pdata.uart_init = debug_port_init;
t->pdata.uart_getc = debug_getc;
t->pdata.uart_putc = debug_putc;
t->pdata.uart_flush = debug_flush;
t->pdata.fiq_enable = fiq_enable;
t->debug_port_base = ioremap(base, PAGE_SIZE);
if (!t->debug_port_base) {
pr_err("Failed to ioremap for fiq debugger\n");
goto out1;
}
res = kzalloc(sizeof(struct resource) * 3, GFP_KERNEL);
if (!res) {
pr_err("Failed to alloc fiq debugger resources\n");
goto out2;
}
pdev = kzalloc(sizeof(struct platform_device), GFP_KERNEL);
if (!pdev) {
pr_err("Failed to alloc fiq debugger platform device\n");
goto out3;
};
res[0].flags = IORESOURCE_IRQ;
res[0].start = irq;
res[0].end = irq;
res[0].name = "fiq";
res[1].flags = IORESOURCE_IRQ;
res[1].start = signal_irq;
res[1].end = signal_irq;
res[1].name = "signal";
res_count = 2;
if (wakeup_irq >= 0) {
res[2].flags = IORESOURCE_IRQ;
res[2].start = wakeup_irq;
res[2].end = wakeup_irq;
res[2].name = "wakeup";
res_count++;
}
pdev->name = "fiq_debugger";
pdev->id = tegra_fiq_debugger_id++;
pdev->dev.platform_data = &t->pdata;
pdev->resource = res;
pdev->num_resources = res_count;
if (platform_device_register(pdev)) {
pr_err("Failed to register fiq debugger\n");
goto out4;
}
return;
out4:
kfree(pdev);
out3:
kfree(res);
out2:
iounmap(t->debug_port_base);
out1:
kfree(t);
}
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