257 lines
6.2 KiB
C
257 lines
6.2 KiB
C
/*
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* Broadcom specific AMBA
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* Broadcom MIPS32 74K core driver
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*
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* Copyright 2009, Broadcom Corporation
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* Copyright 2006, 2007, Michael Buesch <mb@bu3sch.de>
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* Copyright 2010, Bernhard Loos <bernhardloos@googlemail.com>
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* Copyright 2011, Hauke Mehrtens <hauke@hauke-m.de>
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*
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* Licensed under the GNU/GPL. See COPYING for details.
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*/
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#include "bcma_private.h"
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#include <linux/bcma/bcma.h>
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#include <linux/serial.h>
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#include <linux/serial_core.h>
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#include <linux/serial_reg.h>
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#include <linux/time.h>
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/* The 47162a0 hangs when reading MIPS DMP registers registers */
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static inline bool bcma_core_mips_bcm47162a0_quirk(struct bcma_device *dev)
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{
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return dev->bus->chipinfo.id == 47162 && dev->bus->chipinfo.rev == 0 &&
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dev->id.id == BCMA_CORE_MIPS_74K;
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}
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/* The 5357b0 hangs when reading USB20H DMP registers */
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static inline bool bcma_core_mips_bcm5357b0_quirk(struct bcma_device *dev)
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{
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return (dev->bus->chipinfo.id == 0x5357 ||
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dev->bus->chipinfo.id == 0x4749) &&
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dev->bus->chipinfo.pkg == 11 &&
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dev->id.id == BCMA_CORE_USB20_HOST;
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}
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static inline u32 mips_read32(struct bcma_drv_mips *mcore,
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u16 offset)
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{
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return bcma_read32(mcore->core, offset);
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}
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static inline void mips_write32(struct bcma_drv_mips *mcore,
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u16 offset,
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u32 value)
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{
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bcma_write32(mcore->core, offset, value);
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}
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static const u32 ipsflag_irq_mask[] = {
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0,
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BCMA_MIPS_IPSFLAG_IRQ1,
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BCMA_MIPS_IPSFLAG_IRQ2,
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BCMA_MIPS_IPSFLAG_IRQ3,
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BCMA_MIPS_IPSFLAG_IRQ4,
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};
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static const u32 ipsflag_irq_shift[] = {
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0,
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BCMA_MIPS_IPSFLAG_IRQ1_SHIFT,
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BCMA_MIPS_IPSFLAG_IRQ2_SHIFT,
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BCMA_MIPS_IPSFLAG_IRQ3_SHIFT,
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BCMA_MIPS_IPSFLAG_IRQ4_SHIFT,
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};
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static u32 bcma_core_mips_irqflag(struct bcma_device *dev)
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{
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u32 flag;
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if (bcma_core_mips_bcm47162a0_quirk(dev))
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return dev->core_index;
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if (bcma_core_mips_bcm5357b0_quirk(dev))
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return dev->core_index;
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flag = bcma_aread32(dev, BCMA_MIPS_OOBSELOUTA30);
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return flag & 0x1F;
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}
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/* Get the MIPS IRQ assignment for a specified device.
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* If unassigned, 0 is returned.
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*/
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unsigned int bcma_core_mips_irq(struct bcma_device *dev)
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{
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struct bcma_device *mdev = dev->bus->drv_mips.core;
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u32 irqflag;
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unsigned int irq;
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irqflag = bcma_core_mips_irqflag(dev);
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for (irq = 1; irq <= 4; irq++)
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if (bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq)) &
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(1 << irqflag))
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return irq;
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return 0;
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}
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EXPORT_SYMBOL(bcma_core_mips_irq);
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static void bcma_core_mips_set_irq(struct bcma_device *dev, unsigned int irq)
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{
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unsigned int oldirq = bcma_core_mips_irq(dev);
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struct bcma_bus *bus = dev->bus;
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struct bcma_device *mdev = bus->drv_mips.core;
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u32 irqflag;
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irqflag = bcma_core_mips_irqflag(dev);
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BUG_ON(oldirq == 6);
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dev->irq = irq + 2;
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/* clear the old irq */
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if (oldirq == 0)
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bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0),
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bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0)) &
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~(1 << irqflag));
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else
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bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq), 0);
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/* assign the new one */
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if (irq == 0) {
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bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0),
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bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0)) |
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(1 << irqflag));
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} else {
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u32 oldirqflag = bcma_read32(mdev,
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BCMA_MIPS_MIPS74K_INTMASK(irq));
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if (oldirqflag) {
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struct bcma_device *core;
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/* backplane irq line is in use, find out who uses
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* it and set user to irq 0
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*/
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list_for_each_entry_reverse(core, &bus->cores, list) {
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if ((1 << bcma_core_mips_irqflag(core)) ==
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oldirqflag) {
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bcma_core_mips_set_irq(core, 0);
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break;
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}
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}
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}
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bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq),
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1 << irqflag);
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}
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pr_info("set_irq: core 0x%04x, irq %d => %d\n",
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dev->id.id, oldirq + 2, irq + 2);
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}
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static void bcma_core_mips_print_irq(struct bcma_device *dev, unsigned int irq)
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{
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int i;
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static const char *irq_name[] = {"2(S)", "3", "4", "5", "6", "D", "I"};
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printk(KERN_INFO KBUILD_MODNAME ": core 0x%04x, irq :", dev->id.id);
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for (i = 0; i <= 6; i++)
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printk(" %s%s", irq_name[i], i == irq ? "*" : " ");
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printk("\n");
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}
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static void bcma_core_mips_dump_irq(struct bcma_bus *bus)
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{
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struct bcma_device *core;
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list_for_each_entry_reverse(core, &bus->cores, list) {
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bcma_core_mips_print_irq(core, bcma_core_mips_irq(core));
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}
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}
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u32 bcma_cpu_clock(struct bcma_drv_mips *mcore)
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{
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struct bcma_bus *bus = mcore->core->bus;
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if (bus->drv_cc.capabilities & BCMA_CC_CAP_PMU)
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return bcma_pmu_get_clockcpu(&bus->drv_cc);
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pr_err("No PMU available, need this to get the cpu clock\n");
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return 0;
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}
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EXPORT_SYMBOL(bcma_cpu_clock);
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static void bcma_core_mips_flash_detect(struct bcma_drv_mips *mcore)
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{
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struct bcma_bus *bus = mcore->core->bus;
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switch (bus->drv_cc.capabilities & BCMA_CC_CAP_FLASHT) {
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case BCMA_CC_FLASHT_STSER:
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case BCMA_CC_FLASHT_ATSER:
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pr_err("Serial flash not supported.\n");
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break;
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case BCMA_CC_FLASHT_PARA:
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pr_info("found parallel flash.\n");
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bus->drv_cc.pflash.window = 0x1c000000;
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bus->drv_cc.pflash.window_size = 0x02000000;
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if ((bcma_read32(bus->drv_cc.core, BCMA_CC_FLASH_CFG) &
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BCMA_CC_FLASH_CFG_DS) == 0)
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bus->drv_cc.pflash.buswidth = 1;
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else
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bus->drv_cc.pflash.buswidth = 2;
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break;
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default:
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pr_err("flash not supported.\n");
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}
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}
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void bcma_core_mips_init(struct bcma_drv_mips *mcore)
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{
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struct bcma_bus *bus;
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struct bcma_device *core;
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bus = mcore->core->bus;
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pr_info("Initializing MIPS core...\n");
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if (!mcore->setup_done)
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mcore->assigned_irqs = 1;
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/* Assign IRQs to all cores on the bus */
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list_for_each_entry_reverse(core, &bus->cores, list) {
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int mips_irq;
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if (core->irq)
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continue;
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mips_irq = bcma_core_mips_irq(core);
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if (mips_irq > 4)
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core->irq = 0;
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else
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core->irq = mips_irq + 2;
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if (core->irq > 5)
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continue;
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switch (core->id.id) {
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case BCMA_CORE_PCI:
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case BCMA_CORE_PCIE:
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case BCMA_CORE_ETHERNET:
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case BCMA_CORE_ETHERNET_GBIT:
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case BCMA_CORE_MAC_GBIT:
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case BCMA_CORE_80211:
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case BCMA_CORE_USB20_HOST:
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/* These devices get their own IRQ line if available,
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* the rest goes on IRQ0
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*/
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if (mcore->assigned_irqs <= 4)
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bcma_core_mips_set_irq(core,
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mcore->assigned_irqs++);
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break;
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}
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}
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pr_info("IRQ reconfiguration done\n");
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bcma_core_mips_dump_irq(bus);
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if (mcore->setup_done)
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return;
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bcma_chipco_serial_init(&bus->drv_cc);
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bcma_core_mips_flash_detect(mcore);
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mcore->setup_done = true;
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}
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