/*
* arch/ppc/kernel/ibm440gx_common.c
*
* PPC440GX system library
*
* Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
* Copyright (c) 2003, 2004 Zultys Technologies
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <asm/ibm44x.h>
#include <asm/mmu.h>
#include <asm/processor.h>
#include <syslib/ibm440gx_common.h>
/*
* Calculate 440GX clocks
*/
static inline u32 __fix_zero(u32 v, u32 def){
return v ? v : def;
}
void __init ibm440gx_get_clocks(struct ibm44x_clocks* p, unsigned int sys_clk,
unsigned int ser_clk)
{
u32 pllc = CPR_READ(DCRN_CPR_PLLC);
u32 plld = CPR_READ(DCRN_CPR_PLLD);
u32 uart0 = SDR_READ(DCRN_SDR_UART0);
u32 uart1 = SDR_READ(DCRN_SDR_UART1);
/* Dividers */
u32 fbdv = __fix_zero((plld >> 24) & 0x1f, 32);
u32 fwdva = __fix_zero((plld >> 16) & 0xf, 16);
u32 fwdvb = __fix_zero((plld >> 8) & 7, 8);
u32 lfbdv = __fix_zero(plld & 0x3f, 64);
u32 pradv0 = __fix_zero((CPR_READ(DCRN_CPR_PRIMAD) >> 24) & 7, 8);
u32 prbdv0 = __fix_zero((CPR_READ(DCRN_CPR_PRIMBD) >> 24) & 7, 8);
u32 opbdv0 = __fix_zero((CPR_READ(DCRN_CPR_OPBD) >> 24) & 3, 4);
u32 perdv0 = __fix_zero((CPR_READ(DCRN_CPR_PERD) >> 24) & 3, 4);
/* Input clocks for primary dividers */
u32 clk_a, clk_b;
if (pllc & 0x40000000){
u32 m;
/* Feedback path */
switch ((pllc >> 24) & 7){
case 0:
/* PLLOUTx */
m = ((pllc & 0x20000000) ? fwdvb : fwdva) * lfbdv;
break;
case 1:
/* CPU */
m = fwdva * pradv0;
break;
case 5:
/* PERClk */
m = fwdvb * prbdv0 * opbdv0 * perdv0;
break;
default:
printk(KERN_EMERG "invalid PLL feedback source\n");
goto bypass;
}
m *= fbdv;
p->vco = sys_clk * m;
clk_a = p->vco / fwdva;
clk_b = p->vco / fwdvb;
}
else {
bypass:
/* Bypass system PLL */
p->vco = 0;
clk_a = clk_b = sys_clk;
}
p->cpu = clk_a / pradv0;
p->plb = clk_b / prbdv0;
p->opb = p->plb / opbdv0;
p->ebc = p->opb / perdv0;
/* UARTs clock */
if (uart0 & 0x00800000)
p->uart0 = ser_clk;
else
p->uart0 = p->plb / __fix_zero(uart0 & 0xff, 256);
if (uart1 & 0x00800000)
p->uart1 = ser_clk;
else
p->uart1 = p->plb / __fix_zero(uart1 & 0xff, 256);
}
/* Issue L2C diagnostic command */
static inline u32 l2c_diag(u32 addr)
{
mtdcr(DCRN_L2C0_ADDR, addr);
mtdcr(DCRN_L2C0_CMD, L2C_CMD_DIAG);
while (!(mfdcr(DCRN_L2C0_SR) & L2C_SR_CC)) ;
return mfdcr(DCRN_L2C0_DATA);
}
static irqreturn_t l2c_error_handler(int irq, void* dev, struct pt_regs* regs)
{
u32 sr = mfdcr(DCRN_L2C0_SR);
if (sr & L2C_SR_CPE){
/* Read cache trapped address */
u32 addr = l2c_diag(0x42000000);
printk(KERN_EMERG "L2C: Cache Parity Error, addr[16:26] = 0x%08x\n", addr);
}
if (sr & L2C_SR_TPE){
/* Read tag trapped address */
u32 addr = l2c_diag(0x82000000) >> 16;
printk(KERN_EMERG "L2C: Tag Parity Error, addr[16:26] = 0x%08x\n", addr);
}
/* Clear parity errors */
if (sr & (L2C_SR_CPE | L2C_SR_TPE)){
mtdcr(DCRN_L2C0_ADDR, 0);
mtdcr(DCRN_L2C0_CMD, L2C_CMD_CCP | L2C_CMD_CTE);
} else
printk(KERN_EMERG "L2C: LRU error\n");
return IRQ_HANDLED;
}
/* Enable L2 cache */
void __init ibm440gx_l2c_enable(void){
u32 r;
unsigned long flags;
/* Install error handler */
if (request_irq(87, l2c_error_handler, SA_INTERRUPT, "L2C", 0) < 0){
printk(KERN_ERR "Cannot install L2C error handler, cache is not enabled\n");
return;
}
local_irq_save(flags);
asm volatile ("sync" ::: "memory");
/* Disable SRAM */
mtdcr(DCRN_SRAM0_DPC, mfdcr(DCRN_SRAM0_DPC) & ~SRAM_DPC_ENABLE);
mtdcr(DCRN_SRAM0_SB0CR, mfdcr(DCRN_SRAM0_SB0CR) & ~SRAM_SBCR_BU_MASK);
mtdcr(DCRN_SRAM0_SB1CR, mfdcr(DCRN_SRAM0_SB1CR) & ~SRAM_SBCR_BU_MASK);
mtdcr(DCRN_SRAM0_SB2CR, mfdcr(DCRN_SRAM0_SB2CR) & ~SRAM_SBCR_BU_MASK);
mtdcr(DCRN_SRAM0_SB3CR, mfdcr(DCRN_SRAM0_SB3CR) & ~SRAM_SBCR_BU_MASK);
/* Enable L2_MODE without ICU/DCU */
r = mfdcr(DCRN_L2C0_CFG) & ~(L2C_CFG_ICU | L2C_CFG_DCU | L2C_CFG_SS_MASK);
r |= L2C_CFG_L2M | L2C_CFG_SS_256;
mtdcr(DCRN_L2C0_CFG, r);
mtdcr(DCRN_L2C0_ADDR, 0);
/* Hardware Clear Command */
mtdcr(DCRN_L2C0_CMD, L2C_CMD_HCC);
while (!(mfdcr(DCRN_L2C0_SR) & L2C_SR_CC)) ;
/* Clear Cache Parity and Tag Errors */
mtdcr(DCRN_L2C0_CMD, L2C_CMD_CCP | L2C_CMD_CTE);
/* Enable 64G snoop region starting at 0 */
r = mfdcr(DCRN_L2C0_SNP0) & ~(L2C_SNP_BA_MASK | L2C_SNP_SSR_MASK);
r |= L2C_SNP_SSR_32G | L2C_SNP_ESR;
mtdcr(DCRN_L2C0_SNP0, r);
r = mfdcr(DCRN_L2C0_SNP1) & ~(L2C_SNP_BA_MASK | L2C_SNP_SSR_MASK);
r |= 0x80000000 | L2C_SNP_SSR_32G | L2C_SNP_ESR;
mtdcr(DCRN_L2C0_SNP1, r);
asm volatile ("sync" ::: "memory");
/* Enable ICU/DCU ports */
r = mfdcr(DCRN_L2C0_CFG);
r &= ~(L2C_CFG_DCW_MASK | L2C_CFG_PMUX_MASK | L2C_CFG_PMIM | L2C_CFG_TPEI
| L2C_CFG_CPEI | L2C_CFG_NAM | L2C_CFG_NBRM);
r |= L2C_CFG_ICU | L2C_CFG_DCU | L2C_CFG_TPC | L2C_CFG_CPC | L2C_CFG_FRAN
| L2C_CFG_CPIM | L2C_CFG_TPIM | L2C_CFG_LIM | L2C_CFG_SMCM;
mtdcr(DCRN_L2C0_CFG, r);
asm volatile ("sync; isync" ::: "memory");
local_irq_restore(flags);
}
/* Disable L2 cache */
void __init ibm440gx_l2c_disable(void){
u32 r;
unsigned long flags;
local_irq_save(flags);
asm volatile ("sync" ::: "memory");
/* Disable L2C mode */
r = mfdcr(DCRN_L2C0_CFG) & ~(L2C_CFG_L2M | L2C_CFG_ICU | L2C_CFG_DCU);
mtdcr(DCRN_L2C0_CFG, r);
/* Enable SRAM */
mtdcr(DCRN_SRAM0_DPC, mfdcr(DCRN_SRAM0_DPC) | SRAM_DPC_ENABLE);
mtdcr(DCRN_SRAM0_SB0CR,
SRAM_SBCR_BAS0 | SRAM_SBCR_BS_64KB | SRAM_SBCR_BU_RW);
mtdcr(DCRN_SRAM0_SB1CR,
SRAM_SBCR_BAS1 | SRAM_SBCR_BS_64KB | SRAM_SBCR_BU_RW);
mtdcr(DCRN_SRAM0_SB2CR,
SRAM_SBCR_BAS2 | SRAM_SBCR_BS_64KB | SRAM_SBCR_BU_RW);
mtdcr(DCRN_SRAM0_SB3CR,
SRAM_SBCR_BAS3 | SRAM_SBCR_BS_64KB | SRAM_SBCR_BU_RW);
asm volatile ("sync; isync" ::: "memory");
local_irq_restore(flags);
}
void __init ibm440gx_l2c_setup(struct ibm44x_clocks* p)
{
/* Disable L2C on rev.A, rev.B and 800MHz version of rev.C,
enable it on all other revisions
*/
u32 pvr = mfspr(SPRN_PVR);
if (pvr == PVR_440GX_RA || pvr == PVR_440GX_RB ||
(pvr == PVR_440GX_RC && p->cpu > 667000000))
ibm440gx_l2c_disable();
else
ibm440gx_l2c_enable();
}
int __init ibm440gx_get_eth_grp(void)
{
return (SDR_READ(DCRN_SDR_PFC1) & DCRN_SDR_PFC1_EPS) >> DCRN_SDR_PFC1_EPS_SHIFT;
}
void __init ibm440gx_set_eth_grp(int group)
{
SDR_WRITE(DCRN_SDR_PFC1, (SDR_READ(DCRN_SDR_PFC1) & ~DCRN_SDR_PFC1_EPS) | (group << DCRN_SDR_PFC1_EPS_SHIFT));
}
void __init ibm440gx_tah_enable(void)
{
/* Enable TAH0 and TAH1 */
SDR_WRITE(DCRN_SDR_MFR,SDR_READ(DCRN_SDR_MFR) &
~DCRN_SDR_MFR_TAH0);
SDR_WRITE(DCRN_SDR_MFR,SDR_READ(DCRN_SDR_MFR) &
~DCRN_SDR_MFR_TAH1);
}
int ibm440gx_show_cpuinfo(struct seq_file *m){
u32 l2c_cfg = mfdcr(DCRN_L2C0_CFG);
const char* s;
if (l2c_cfg & L2C_CFG_L2M){
switch (l2c_cfg & (L2C_CFG_ICU | L2C_CFG_DCU)){
case L2C_CFG_ICU: s = "I-Cache only"; break;
case L2C_CFG_DCU: s = "D-Cache only"; break;
default: s = "I-Cache/D-Cache"; break;
}
}
else
s = "disabled";
seq_printf(m, "L2-Cache\t: %s (0x%08x 0x%08x)\n", s,
l2c_cfg, mfdcr(DCRN_L2C0_SR));
return 0;
}
