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linux-next/drivers/bcma/driver_mips.c
Rafał Miłecki 7195439d1d Revert "bcma: init serial console directly from ChipCommon code" 
This reverts commit 4c81acab38 ("bcma: init serial console directly
from ChipCommon code") as it broke IRQ assignment. Getting IRQ with
bcma_core_irq helper on SoC requires MIPS core to be set. It happens
*after* ChipCommon initialization so we can't do this so early.

This fixes a user reported regression. It wasn't critical as serial was
still somehow working but lack of IRQs was making in unreliable.

Fixes: 4c81acab38 ("bcma: init serial console directly from ChipCommon code")
Reported-by: Felix Fietkau <nbd@nbd.name>
Cc: stable@vger.kernel.org # 4.6+
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
2017-01-17 14:23:44 +02:00

380 lines
9.9 KiB
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/*
* Broadcom specific AMBA
* Broadcom MIPS32 74K core driver
*
* Copyright 2009, Broadcom Corporation
* Copyright 2006, 2007, Michael Buesch <mb@bu3sch.de>
* Copyright 2010, Bernhard Loos <bernhardloos@googlemail.com>
* Copyright 2011, Hauke Mehrtens <hauke@hauke-m.de>
*
* Licensed under the GNU/GPL. See COPYING for details.
*/
#include "bcma_private.h"
#include <linux/bcma/bcma.h>
#include <linux/serial.h>
#include <linux/serial_core.h>
#include <linux/serial_reg.h>
#include <linux/time.h>
#ifdef CONFIG_BCM47XX
#include <linux/bcm47xx_nvram.h>
#endif
enum bcma_boot_dev {
BCMA_BOOT_DEV_UNK = 0,
BCMA_BOOT_DEV_ROM,
BCMA_BOOT_DEV_PARALLEL,
BCMA_BOOT_DEV_SERIAL,
BCMA_BOOT_DEV_NAND,
};
/* The 47162a0 hangs when reading MIPS DMP registers registers */
static inline bool bcma_core_mips_bcm47162a0_quirk(struct bcma_device *dev)
{
return dev->bus->chipinfo.id == BCMA_CHIP_ID_BCM47162 &&
dev->bus->chipinfo.rev == 0 && dev->id.id == BCMA_CORE_MIPS_74K;
}
/* The 5357b0 hangs when reading USB20H DMP registers */
static inline bool bcma_core_mips_bcm5357b0_quirk(struct bcma_device *dev)
{
return (dev->bus->chipinfo.id == BCMA_CHIP_ID_BCM5357 ||
dev->bus->chipinfo.id == BCMA_CHIP_ID_BCM4749) &&
dev->bus->chipinfo.pkg == 11 &&
dev->id.id == BCMA_CORE_USB20_HOST;
}
static inline u32 mips_read32(struct bcma_drv_mips *mcore,
u16 offset)
{
return bcma_read32(mcore->core, offset);
}
static inline void mips_write32(struct bcma_drv_mips *mcore,
u16 offset,
u32 value)
{
bcma_write32(mcore->core, offset, value);
}
static const u32 ipsflag_irq_mask[] = {
0,
BCMA_MIPS_IPSFLAG_IRQ1,
BCMA_MIPS_IPSFLAG_IRQ2,
BCMA_MIPS_IPSFLAG_IRQ3,
BCMA_MIPS_IPSFLAG_IRQ4,
};
static const u32 ipsflag_irq_shift[] = {
0,
BCMA_MIPS_IPSFLAG_IRQ1_SHIFT,
BCMA_MIPS_IPSFLAG_IRQ2_SHIFT,
BCMA_MIPS_IPSFLAG_IRQ3_SHIFT,
BCMA_MIPS_IPSFLAG_IRQ4_SHIFT,
};
static u32 bcma_core_mips_irqflag(struct bcma_device *dev)
{
u32 flag;
if (bcma_core_mips_bcm47162a0_quirk(dev))
return dev->core_index;
if (bcma_core_mips_bcm5357b0_quirk(dev))
return dev->core_index;
flag = bcma_aread32(dev, BCMA_MIPS_OOBSELOUTA30);
if (flag)
return flag & 0x1F;
else
return 0x3f;
}
/* Get the MIPS IRQ assignment for a specified device.
* If unassigned, 0 is returned.
* If disabled, 5 is returned.
* If not supported, 6 is returned.
*/
unsigned int bcma_core_mips_irq(struct bcma_device *dev)
{
struct bcma_device *mdev = dev->bus->drv_mips.core;
u32 irqflag;
unsigned int irq;
irqflag = bcma_core_mips_irqflag(dev);
if (irqflag == 0x3f)
return 6;
for (irq = 0; irq <= 4; irq++)
if (bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq)) &
(1 << irqflag))
return irq;
return 5;
}
static void bcma_core_mips_set_irq(struct bcma_device *dev, unsigned int irq)
{
unsigned int oldirq = bcma_core_mips_irq(dev);
struct bcma_bus *bus = dev->bus;
struct bcma_device *mdev = bus->drv_mips.core;
u32 irqflag;
irqflag = bcma_core_mips_irqflag(dev);
BUG_ON(oldirq == 6);
dev->irq = irq + 2;
/* clear the old irq */
if (oldirq == 0)
bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0),
bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0)) &
~(1 << irqflag));
else if (oldirq != 5)
bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(oldirq), 0);
/* assign the new one */
if (irq == 0) {
bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0),
bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0)) |
(1 << irqflag));
} else {
u32 irqinitmask = bcma_read32(mdev,
BCMA_MIPS_MIPS74K_INTMASK(irq));
if (irqinitmask) {
struct bcma_device *core;
/* backplane irq line is in use, find out who uses
* it and set user to irq 0
*/
list_for_each_entry(core, &bus->cores, list) {
if ((1 << bcma_core_mips_irqflag(core)) ==
irqinitmask) {
bcma_core_mips_set_irq(core, 0);
break;
}
}
}
bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq),
1 << irqflag);
}
bcma_debug(bus, "set_irq: core 0x%04x, irq %d => %d\n",
dev->id.id, oldirq <= 4 ? oldirq + 2 : 0, irq + 2);
}
static void bcma_core_mips_set_irq_name(struct bcma_bus *bus, unsigned int irq,
u16 coreid, u8 unit)
{
struct bcma_device *core;
core = bcma_find_core_unit(bus, coreid, unit);
if (!core) {
bcma_warn(bus,
"Can not find core (id: 0x%x, unit %i) for IRQ configuration.\n",
coreid, unit);
return;
}
bcma_core_mips_set_irq(core, irq);
}
static void bcma_core_mips_print_irq(struct bcma_device *dev, unsigned int irq)
{
int i;
static const char *irq_name[] = {"2(S)", "3", "4", "5", "6", "D", "I"};
printk(KERN_DEBUG KBUILD_MODNAME ": core 0x%04x, irq :", dev->id.id);
for (i = 0; i <= 6; i++)
printk(" %s%s", irq_name[i], i == irq ? "*" : " ");
printk("\n");
}
static void bcma_core_mips_dump_irq(struct bcma_bus *bus)
{
struct bcma_device *core;
list_for_each_entry(core, &bus->cores, list) {
bcma_core_mips_print_irq(core, bcma_core_mips_irq(core));
}
}
u32 bcma_cpu_clock(struct bcma_drv_mips *mcore)
{
struct bcma_bus *bus = mcore->core->bus;
if (bus->drv_cc.capabilities & BCMA_CC_CAP_PMU)
return bcma_pmu_get_cpu_clock(&bus->drv_cc);
bcma_err(bus, "No PMU available, need this to get the cpu clock\n");
return 0;
}
EXPORT_SYMBOL(bcma_cpu_clock);
static enum bcma_boot_dev bcma_boot_dev(struct bcma_bus *bus)
{
struct bcma_drv_cc *cc = &bus->drv_cc;
u8 cc_rev = cc->core->id.rev;
if (cc_rev == 42) {
struct bcma_device *core;
core = bcma_find_core(bus, BCMA_CORE_NS_ROM);
if (core) {
switch (bcma_aread32(core, BCMA_IOST) &
BCMA_NS_ROM_IOST_BOOT_DEV_MASK) {
case BCMA_NS_ROM_IOST_BOOT_DEV_NOR:
return BCMA_BOOT_DEV_SERIAL;
case BCMA_NS_ROM_IOST_BOOT_DEV_NAND:
return BCMA_BOOT_DEV_NAND;
case BCMA_NS_ROM_IOST_BOOT_DEV_ROM:
default:
return BCMA_BOOT_DEV_ROM;
}
}
} else {
if (cc_rev == 38) {
if (cc->status & BCMA_CC_CHIPST_5357_NAND_BOOT)
return BCMA_BOOT_DEV_NAND;
else if (cc->status & BIT(5))
return BCMA_BOOT_DEV_ROM;
}
if ((cc->capabilities & BCMA_CC_CAP_FLASHT) ==
BCMA_CC_FLASHT_PARA)
return BCMA_BOOT_DEV_PARALLEL;
else
return BCMA_BOOT_DEV_SERIAL;
}
return BCMA_BOOT_DEV_SERIAL;
}
static void bcma_core_mips_nvram_init(struct bcma_drv_mips *mcore)
{
struct bcma_bus *bus = mcore->core->bus;
enum bcma_boot_dev boot_dev;
/* Determine flash type this SoC boots from */
boot_dev = bcma_boot_dev(bus);
switch (boot_dev) {
case BCMA_BOOT_DEV_PARALLEL:
case BCMA_BOOT_DEV_SERIAL:
#ifdef CONFIG_BCM47XX
bcm47xx_nvram_init_from_mem(BCMA_SOC_FLASH2,
BCMA_SOC_FLASH2_SZ);
#endif
break;
case BCMA_BOOT_DEV_NAND:
#ifdef CONFIG_BCM47XX
bcm47xx_nvram_init_from_mem(BCMA_SOC_FLASH1,
BCMA_SOC_FLASH1_SZ);
#endif
break;
default:
break;
}
}
void bcma_core_mips_early_init(struct bcma_drv_mips *mcore)
{
struct bcma_bus *bus = mcore->core->bus;
if (mcore->early_setup_done)
return;
bcma_chipco_serial_init(&bus->drv_cc);
bcma_core_mips_nvram_init(mcore);
mcore->early_setup_done = true;
}
static void bcma_fix_i2s_irqflag(struct bcma_bus *bus)
{
struct bcma_device *cpu, *pcie, *i2s;
/* Fixup the interrupts in 4716/4748 for i2s core (2010 Broadcom SDK)
* (IRQ flags > 7 are ignored when setting the interrupt masks)
*/
if (bus->chipinfo.id != BCMA_CHIP_ID_BCM4716 &&
bus->chipinfo.id != BCMA_CHIP_ID_BCM4748)
return;
cpu = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
pcie = bcma_find_core(bus, BCMA_CORE_PCIE);
i2s = bcma_find_core(bus, BCMA_CORE_I2S);
if (cpu && pcie && i2s &&
bcma_aread32(cpu, BCMA_MIPS_OOBSELINA74) == 0x08060504 &&
bcma_aread32(pcie, BCMA_MIPS_OOBSELINA74) == 0x08060504 &&
bcma_aread32(i2s, BCMA_MIPS_OOBSELOUTA30) == 0x88) {
bcma_awrite32(cpu, BCMA_MIPS_OOBSELINA74, 0x07060504);
bcma_awrite32(pcie, BCMA_MIPS_OOBSELINA74, 0x07060504);
bcma_awrite32(i2s, BCMA_MIPS_OOBSELOUTA30, 0x87);
bcma_debug(bus,
"Moved i2s interrupt to oob line 7 instead of 8\n");
}
}
void bcma_core_mips_init(struct bcma_drv_mips *mcore)
{
struct bcma_bus *bus;
struct bcma_device *core;
bus = mcore->core->bus;
if (mcore->setup_done)
return;
bcma_debug(bus, "Initializing MIPS core...\n");
bcma_core_mips_early_init(mcore);
bcma_fix_i2s_irqflag(bus);
switch (bus->chipinfo.id) {
case BCMA_CHIP_ID_BCM4716:
case BCMA_CHIP_ID_BCM4748:
bcma_core_mips_set_irq_name(bus, 1, BCMA_CORE_80211, 0);
bcma_core_mips_set_irq_name(bus, 2, BCMA_CORE_MAC_GBIT, 0);
bcma_core_mips_set_irq_name(bus, 3, BCMA_CORE_USB20_HOST, 0);
bcma_core_mips_set_irq_name(bus, 4, BCMA_CORE_PCIE, 0);
bcma_core_mips_set_irq_name(bus, 0, BCMA_CORE_CHIPCOMMON, 0);
bcma_core_mips_set_irq_name(bus, 0, BCMA_CORE_I2S, 0);
break;
case BCMA_CHIP_ID_BCM5356:
case BCMA_CHIP_ID_BCM47162:
case BCMA_CHIP_ID_BCM53572:
bcma_core_mips_set_irq_name(bus, 1, BCMA_CORE_80211, 0);
bcma_core_mips_set_irq_name(bus, 2, BCMA_CORE_MAC_GBIT, 0);
bcma_core_mips_set_irq_name(bus, 0, BCMA_CORE_CHIPCOMMON, 0);
break;
case BCMA_CHIP_ID_BCM5357:
case BCMA_CHIP_ID_BCM4749:
bcma_core_mips_set_irq_name(bus, 1, BCMA_CORE_80211, 0);
bcma_core_mips_set_irq_name(bus, 2, BCMA_CORE_MAC_GBIT, 0);
bcma_core_mips_set_irq_name(bus, 3, BCMA_CORE_USB20_HOST, 0);
bcma_core_mips_set_irq_name(bus, 0, BCMA_CORE_CHIPCOMMON, 0);
bcma_core_mips_set_irq_name(bus, 0, BCMA_CORE_I2S, 0);
break;
case BCMA_CHIP_ID_BCM4706:
bcma_core_mips_set_irq_name(bus, 1, BCMA_CORE_PCIE, 0);
bcma_core_mips_set_irq_name(bus, 2, BCMA_CORE_4706_MAC_GBIT,
0);
bcma_core_mips_set_irq_name(bus, 3, BCMA_CORE_PCIE, 1);
bcma_core_mips_set_irq_name(bus, 4, BCMA_CORE_USB20_HOST, 0);
bcma_core_mips_set_irq_name(bus, 0, BCMA_CORE_4706_CHIPCOMMON,
0);
break;
default:
list_for_each_entry(core, &bus->cores, list) {
core->irq = bcma_core_irq(core, 0);
}
bcma_err(bus,
"Unknown device (0x%x) found, can not configure IRQs\n",
bus->chipinfo.id);
}
bcma_debug(bus, "IRQ reconfiguration done\n");
bcma_core_mips_dump_irq(bus);
mcore->setup_done = true;
}
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