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/*
* 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.
*
* Copyright (C) 2003 Atheros Communications, Inc., All Rights Reserved.
* Copyright (C) 2006 FON Technology, SL.
* Copyright (C) 2006 Imre Kaloz <kaloz@openwrt.org>
* Copyright (C) 2006-2009 Felix Fietkau <nbd@openwrt.org>
* Copyright (C) 2012 Alexandros C. Couloumbis <alex@ozo.com>
*/
/*
* Platform devices for Atheros AR5312 SoCs
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/bitops.h>
#include <linux/irqdomain.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/mtd/physmap.h>
#include <linux/reboot.h>
#include <asm/bootinfo.h>
#include <asm/reboot.h>
#include <asm/time.h>
#include <ath25_platform.h>
#include "devices.h"
#include "ar5312.h"
#include "ar5312_regs.h"
static void __iomem *ar5312_rst_base;
static struct irq_domain *ar5312_misc_irq_domain;
static inline u32 ar5312_rst_reg_read(u32 reg)
{
return __raw_readl(ar5312_rst_base + reg);
}
static inline void ar5312_rst_reg_write(u32 reg, u32 val)
{
__raw_writel(val, ar5312_rst_base + reg);
}
static inline void ar5312_rst_reg_mask(u32 reg, u32 mask, u32 val)
{
u32 ret = ar5312_rst_reg_read(reg);
ret &= ~mask;
ret |= val;
ar5312_rst_reg_write(reg, ret);
}
static irqreturn_t ar5312_ahb_err_handler(int cpl, void *dev_id)
{
u32 proc1 = ar5312_rst_reg_read(AR5312_PROC1);
u32 proc_addr = ar5312_rst_reg_read(AR5312_PROCADDR); /* clears error */
u32 dma1 = ar5312_rst_reg_read(AR5312_DMA1);
u32 dma_addr = ar5312_rst_reg_read(AR5312_DMAADDR); /* clears error */
pr_emerg("AHB interrupt: PROCADDR=0x%8.8x PROC1=0x%8.8x DMAADDR=0x%8.8x DMA1=0x%8.8x\n",
proc_addr, proc1, dma_addr, dma1);
machine_restart("AHB error"); /* Catastrophic failure */
return IRQ_HANDLED;
}
static struct irqaction ar5312_ahb_err_interrupt = {
.handler = ar5312_ahb_err_handler,
.name = "ar5312-ahb-error",
};
static void ar5312_misc_irq_handler(unsigned irq, struct irq_desc *desc)
{
u32 pending = ar5312_rst_reg_read(AR5312_ISR) &
ar5312_rst_reg_read(AR5312_IMR);
unsigned nr, misc_irq = 0;
if (pending) {
struct irq_domain *domain = irq_desc_get_handler_data(desc);
nr = __ffs(pending);
misc_irq = irq_find_mapping(domain, nr);
}
if (misc_irq) {
generic_handle_irq(misc_irq);
if (nr == AR5312_MISC_IRQ_TIMER)
ar5312_rst_reg_read(AR5312_TIMER);
} else {
spurious_interrupt();
}
}
/* Enable the specified AR5312_MISC_IRQ interrupt */
static void ar5312_misc_irq_unmask(struct irq_data *d)
{
ar5312_rst_reg_mask(AR5312_IMR, 0, BIT(d->hwirq));
}
/* Disable the specified AR5312_MISC_IRQ interrupt */
static void ar5312_misc_irq_mask(struct irq_data *d)
{
ar5312_rst_reg_mask(AR5312_IMR, BIT(d->hwirq), 0);
ar5312_rst_reg_read(AR5312_IMR); /* flush write buffer */
}
static struct irq_chip ar5312_misc_irq_chip = {
.name = "ar5312-misc",
.irq_unmask = ar5312_misc_irq_unmask,
.irq_mask = ar5312_misc_irq_mask,
};
static int ar5312_misc_irq_map(struct irq_domain *d, unsigned irq,
irq_hw_number_t hw)
{
irq_set_chip_and_handler(irq, &ar5312_misc_irq_chip, handle_level_irq);
return 0;
}
static struct irq_domain_ops ar5312_misc_irq_domain_ops = {
.map = ar5312_misc_irq_map,
};
static void ar5312_irq_dispatch(void)
{
u32 pending = read_c0_status() & read_c0_cause();
if (pending & CAUSEF_IP2)
do_IRQ(AR5312_IRQ_WLAN0);
else if (pending & CAUSEF_IP5)
do_IRQ(AR5312_IRQ_WLAN1);
else if (pending & CAUSEF_IP6)
do_IRQ(AR5312_IRQ_MISC);
else if (pending & CAUSEF_IP7)
do_IRQ(ATH25_IRQ_CPU_CLOCK);
else
spurious_interrupt();
}
void __init ar5312_arch_init_irq(void)
{
struct irq_domain *domain;
unsigned irq;
ath25_irq_dispatch = ar5312_irq_dispatch;
domain = irq_domain_add_linear(NULL, AR5312_MISC_IRQ_COUNT,
&ar5312_misc_irq_domain_ops, NULL);
if (!domain)
panic("Failed to add IRQ domain");
irq = irq_create_mapping(domain, AR5312_MISC_IRQ_AHB_PROC);
setup_irq(irq, &ar5312_ahb_err_interrupt);
irq_set_chained_handler_and_data(AR5312_IRQ_MISC,
ar5312_misc_irq_handler, domain);
ar5312_misc_irq_domain = domain;
}
static struct physmap_flash_data ar5312_flash_data = {
.width = 2,
};
static struct resource ar5312_flash_resource = {
.start = AR5312_FLASH_BASE,
.end = AR5312_FLASH_BASE + AR5312_FLASH_SIZE - 1,
.flags = IORESOURCE_MEM,
};
static struct platform_device ar5312_physmap_flash = {
.name = "physmap-flash",
.id = 0,
.dev.platform_data = &ar5312_flash_data,
.resource = &ar5312_flash_resource,
.num_resources = 1,
};
static void __init ar5312_flash_init(void)
{
void __iomem *flashctl_base;
u32 ctl;
flashctl_base = ioremap_nocache(AR5312_FLASHCTL_BASE,
AR5312_FLASHCTL_SIZE);
ctl = __raw_readl(flashctl_base + AR5312_FLASHCTL0);
ctl &= AR5312_FLASHCTL_MW;
/* fixup flash width */
switch (ctl) {
case AR5312_FLASHCTL_MW16:
ar5312_flash_data.width = 2;
break;
case AR5312_FLASHCTL_MW8:
default:
ar5312_flash_data.width = 1;
break;
}
/*
* Configure flash bank 0.
* Assume 8M window size. Flash will be aliased if it's smaller
*/
ctl |= AR5312_FLASHCTL_E | AR5312_FLASHCTL_AC_8M | AR5312_FLASHCTL_RBLE;
ctl |= 0x01 << AR5312_FLASHCTL_IDCY_S;
ctl |= 0x07 << AR5312_FLASHCTL_WST1_S;
ctl |= 0x07 << AR5312_FLASHCTL_WST2_S;
__raw_writel(ctl, flashctl_base + AR5312_FLASHCTL0);
/* Disable other flash banks */
ctl = __raw_readl(flashctl_base + AR5312_FLASHCTL1);
ctl &= ~(AR5312_FLASHCTL_E | AR5312_FLASHCTL_AC);
__raw_writel(ctl, flashctl_base + AR5312_FLASHCTL1);
ctl = __raw_readl(flashctl_base + AR5312_FLASHCTL2);
ctl &= ~(AR5312_FLASHCTL_E | AR5312_FLASHCTL_AC);
__raw_writel(ctl, flashctl_base + AR5312_FLASHCTL2);
iounmap(flashctl_base);
}
void __init ar5312_init_devices(void)
{
struct ath25_boarddata *config;
ar5312_flash_init();
/* Locate board/radio config data */
ath25_find_config(AR5312_FLASH_BASE, AR5312_FLASH_SIZE);
config = ath25_board.config;
/* AR2313 has CPU minor rev. 10 */
if ((current_cpu_data.processor_id & 0xff) == 0x0a)
ath25_soc = ATH25_SOC_AR2313;
/* AR2312 shares the same Silicon ID as AR5312 */
else if (config->flags & BD_ISCASPER)
ath25_soc = ATH25_SOC_AR2312;
/* Everything else is probably AR5312 or compatible */
else
ath25_soc = ATH25_SOC_AR5312;
platform_device_register(&ar5312_physmap_flash);
switch (ath25_soc) {
case ATH25_SOC_AR5312:
if (!ath25_board.radio)
return;
if (!(config->flags & BD_WLAN0))
break;
ath25_add_wmac(0, AR5312_WLAN0_BASE, AR5312_IRQ_WLAN0);
break;
case ATH25_SOC_AR2312:
case ATH25_SOC_AR2313:
if (!ath25_board.radio)
return;
break;
default:
break;
}
if (config->flags & BD_WLAN1)
ath25_add_wmac(1, AR5312_WLAN1_BASE, AR5312_IRQ_WLAN1);
}
static void ar5312_restart(char *command)
{
/* reset the system */
local_irq_disable();
while (1)
ar5312_rst_reg_write(AR5312_RESET, AR5312_RESET_SYSTEM);
}
/*
* This table is indexed by bits 5..4 of the CLOCKCTL1 register
* to determine the predevisor value.
*/
static unsigned clockctl1_predivide_table[4] __initdata = { 1, 2, 4, 5 };
static unsigned __init ar5312_cpu_frequency(void)
{
u32 scratch, devid, clock_ctl1;
u32 predivide_mask, multiplier_mask, doubler_mask;
unsigned predivide_shift, multiplier_shift;
unsigned predivide_select, predivisor, multiplier;
/* Trust the bootrom's idea of cpu frequency. */
scratch = ar5312_rst_reg_read(AR5312_SCRATCH);
if (scratch)
return scratch;
devid =
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