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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) 2008 Maxime Bizon <mbizon@freebox.fr>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/cpu.h>
#include <bcm63xx_cpu.h>
#include <bcm63xx_regs.h>
#include <bcm63xx_io.h>
#include <bcm63xx_irq.h>
const unsigned long *bcm63xx_regs_base;
EXPORT_SYMBOL(bcm63xx_regs_base);
const int *bcm63xx_irqs;
EXPORT_SYMBOL(bcm63xx_irqs);
static u16 bcm63xx_cpu_id;
static u16 bcm63xx_cpu_rev;
static unsigned int bcm63xx_cpu_freq;
static unsigned int bcm63xx_memory_size;
/*
* 6348 register sets and irqs
*/
static const unsigned long bcm96348_regs_base[] = {
[RSET_DSL_LMEM] = BCM_6348_DSL_LMEM_BASE,
[RSET_PERF] = BCM_6348_PERF_BASE,
[RSET_TIMER] = BCM_6348_TIMER_BASE,
[RSET_WDT] = BCM_6348_WDT_BASE,
[RSET_UART0] = BCM_6348_UART0_BASE,
[RSET_GPIO] = BCM_6348_GPIO_BASE,
[RSET_SPI] = BCM_6348_SPI_BASE,
[RSET_OHCI0] = BCM_6348_OHCI0_BASE,
[RSET_OHCI_PRIV] = BCM_6348_OHCI_PRIV_BASE,
[RSET_USBH_PRIV] = BCM_6348_USBH_PRIV_BASE,
[RSET_MPI] = BCM_6348_MPI_BASE,
[RSET_PCMCIA] = BCM_6348_PCMCIA_BASE,
[RSET_SDRAM] = BCM_6348_SDRAM_BASE,
[RSET_DSL] = BCM_6348_DSL_BASE,
[RSET_ENET0] = BCM_6348_ENET0_BASE,
[RSET_ENET1] = BCM_6348_ENET1_BASE,
[RSET_ENETDMA] = BCM_6348_ENETDMA_BASE,
[RSET_MEMC] = BCM_6348_MEMC_BASE,
[RSET_DDR] = BCM_6348_DDR_BASE,
};
static const int bcm96348_irqs[] = {
[IRQ_TIMER] = BCM_6348_TIMER_IRQ,
[IRQ_UART0] = BCM_6348_UART0_IRQ,
[IRQ_DSL] = BCM_6348_DSL_IRQ,
[IRQ_ENET0] = BCM_6348_ENET0_IRQ,
[IRQ_ENET1] = BCM_6348_ENET1_IRQ,
[IRQ_ENET_PHY] = BCM_6348_ENET_PHY_IRQ,
[IRQ_OHCI0] = BCM_6348_OHCI0_IRQ,
[IRQ_PCMCIA] = BCM_6348_PCMCIA_IRQ,
[IRQ_ENET0_RXDMA] = BCM_6348_ENET0_RXDMA_IRQ,
[IRQ_ENET0_TXDMA] = BCM_6348_ENET0_TXDMA_IRQ,
[IRQ_ENET1_RXDMA] = BCM_6348_ENET1_RXDMA_IRQ,
[IRQ_ENET1_TXDMA] = BCM_6348_ENET1_TXDMA_IRQ,
[IRQ_PCI] = BCM_6348_PCI_IRQ,
};
/*
* 6358 register sets and irqs
*/
static const unsigned long bcm96358_regs_base[] = {
[RSET_DSL_LMEM] = BCM_6358_DSL_LMEM_BASE,
[RSET_PERF] = BCM_6358_PERF_BASE,
[RSET_TIMER] = BCM_6358_TIMER_BASE,
[RSET_WDT] = BCM_6358_WDT_BASE,
[RSET_UART0] = BCM_6358_UART0_BASE,
[RSET_GPIO] = BCM_6358_GPIO_BASE,
[RSET_SPI] = BCM_6358_SPI_BASE,
[RSET_OHCI0] = BCM_6358_OHCI0_BASE,
[RSET_EHCI0] = BCM_6358_EHCI0_BASE,
[RSET_OHCI_PRIV] = BCM_6358_OHCI_PRIV_BASE,
[RSET_USBH_PRIV] = BCM_6358_USBH_PRIV_BASE,
[RSET_MPI] = BCM_6358_MPI_BASE,
[RSET_PCMCIA] = BCM_6358_PCMCIA_BASE,
[RSET_SDRAM] = BCM_6358_SDRAM_BASE,
[RSET_DSL] = BCM_6358_DSL_BASE,
[RSET_ENET0] = BCM_6358_ENET0_BASE,
[RSET_ENET1] = BCM_6358_ENET1_BASE,
[RSET_ENETDMA] = BCM_6358_ENETDMA_BASE,
[RSET_MEMC] = BCM_6358_MEMC_BASE,
[RSET_DDR] = BCM_6358_DDR_BASE,
};
static const int bcm96358_irqs[] = {
[IRQ_TIMER] = BCM_6358_TIMER_IRQ,
[IRQ_UART0] = BCM_6358_UART0_IRQ,
[IRQ_DSL] = BCM_6358_DSL_IRQ,
[IRQ_ENET0] = BCM_6358_ENET0_IRQ,
[IRQ_ENET1] = BCM_6358_ENET1_IRQ,
[IRQ_ENET_PHY] = BCM_6358_ENET_PHY_IRQ,
[IRQ_OHCI0] = BCM_6358_OHCI0_IRQ,
[IRQ_EHCI0] = BCM_6358_EHCI0_IRQ,
[IRQ_PCMCIA] = BCM_6358_PCMCIA_IRQ,
[IRQ_ENET0_RXDMA] = BCM_6358_ENET0_RXDMA_IRQ,
[IRQ_ENET0_TXDMA] = BCM_6358_ENET0_TXDMA_IRQ,
[IRQ_ENET1_RXDMA] = BCM_6358_ENET1_RXDMA_IRQ,
[IRQ_ENET1_TXDMA] = BCM_6358_ENET1_TXDMA_IRQ,
[IRQ_PCI] = BCM_6358_PCI_IRQ,
};
u16 __bcm63xx_get_cpu_id(void)
{
return bcm63xx_cpu_id;
}
EXPORT_SYMBOL(__bcm63xx_get_cpu_id);
u16 bcm63xx_get_cpu_rev(void)
{
return bcm63xx_cpu_rev;
}
EXPORT_SYMBOL(bcm63xx_get_cpu_rev);
unsigned int bcm63xx_get_cpu_freq(void)
{
return bcm63xx_cpu_freq;
}
unsigned int bcm63xx_get_memory_size(void)
{
return bcm63xx_memory_size;
}
static unsigned int detect_cpu_clock(void)
{
unsigned int tmp, n1 = 0, n2 = 0, m1 = 0;
/*
* frequency depends on PLL configuration:
*/
if (BCMCPU_IS_6348()) {
/* 16MHz * (N1 + 1) * (N2 + 2) / (M1_CPU + 1) */
tmp = bcm_perf_readl(PERF_MIPSPLLCTL_REG);
n1 = (tmp & MIPSPLLCTL_N1_MASK) >> MIPSPLLCTL_N1_SHIFT;
n2 = (tmp & MIPSPLLCTL_N2_MASK) >> MIPSPLLCTL_N2_SHIFT;
m1 = (tmp & MIPSPLLCTL_M1CPU_MASK) >> MIPSPLLCTL_M1CPU_SHIFT;
n1 += 1;
n2 += 2;
m1 += 1;
}
if (BCMCPU_IS_6358()) {
/* 16MHz * N1 * N2 / M1_CPU */
tmp = bcm_ddr_readl(DDR_DMIPSPLLCFG_REG);
n1 = (tmp & DMIPSPLLCFG_N1_MASK) >> DMIPSPLLCFG_N1_SHIFT;
n2 = (tmp & DMIPSPLLCFG_N2_MASK) >> DMIPSPLLCFG_N2_SHIFT;
m1 = (tmp & DMIPSPLLCFG_M1_MASK) >> DMIPSPLLCFG_M1_SHIFT;
}
return (16 * 1000000 * n1 * n2) / m1;
}
/*
* attempt to detect the amount of memory installed
*/
static unsigned int detect_memory_size(void)
{
unsigned int cols = 0, rows = 0, is_32bits = 0, banks = 0;
u32 val;
if (BCMCPU_IS_6348()) {
val = bcm_sdram_readl(SDRAM_CFG_REG);
rows = (val & SDRAM_CFG_ROW_MASK) >> SDRAM_CFG_ROW_SHIFT;
cols = (val & SDRAM_CFG_COL_MASK) >> SDRAM_CFG_COL_SHIFT;
is_32bits = (val & SDRAM_CFG_32B_MASK) ? 1 : 0;
banks = (val & SDRAM_CFG_BANK_MASK) ? 2 : 1;
}
if (BCMCPU_IS_6358()) {
val = bcm_memc_readl(MEMC_CFG_REG);
rows = (val & MEMC_CFG_ROW_MASK) >> MEMC_CFG_ROW_SHIFT;
cols = (val & MEMC_CFG_COL_MASK) >> MEMC_CFG_COL_SHIFT;
is_32bits = (val & MEMC_CFG_32B_MASK) ? 0 : 1;
banks = 2;
}
/* 0 => 11 address bits ... 2 => 13 address bits */
rows += 11;
/* 0 => 8 address bits ... 2 => 10 address bits */
cols += 8;
return 1 << (cols + rows + (is_32bits + 1) + banks);
}
void __init bcm63xx_cpu_init(void)
{
unsigned int tmp, expected_cpu_id;
struct cpuinfo_mips *c = ¤t_cpu_data;
/* soc registers location depends on cpu type */
expected_cpu_id = 0;
switch (c->cputype) {
case CPU_BCM6348:
expected_cpu_id = BCM6348_CPU_ID;
bcm63xx_regs_base = bcm96348_regs_base;
bcm63xx_irqs = bcm96348_irqs;
break;
case CPU_BCM6358:
expected_cpu_id = BCM6358_CPU_ID;
bcm63xx_regs_base = bcm96358_regs_base;
bcm63xx_irqs = bcm96358_irqs;
break;
}
/* really early to panic, but delaying panic would not help
* since we will never get any working console */
if (!expected_cpu_id)
panic("unsupported Broadcom CPU");
/*
* bcm63xx_regs_base is set, we can access soc registers
*/
/* double check CPU type */
tmp = bcm_perf_readl(PERF_REV_REG);
bcm63xx_cpu_id = (tmp & REV_CHIPID_MASK) >> REV_CHIPID_SHIFT;
bcm63xx_cpu_rev = (tmp & REV_REVID_MASK) >> REV_REVID_SHIFT;
if (bcm63xx_cpu_id != expected_cpu_id)
panic("bcm63xx CPU id mismatch");
bcm63xx_cpu_freq = detect_cpu_clock();
bcm63xx_memory_size = detect_memory_size();
printk(KERN_INFO "Detected Broadcom 0x%04x CPU revision %02x\n",
bcm63xx_cpu_id, bcm63xx_cpu_rev);
printk(KERN_INFO "CPU frequency is %u MHz\n",
bcm63xx_cpu_freq);
printk(KERN_INFO "%uMB of RAM installed\n",
bcm63xx_memory_size >> 20);
}
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