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-rw-r--r--arch/ppc/syslib/ibm440gx_common.c270
1 files changed, 270 insertions, 0 deletions
diff --git a/arch/ppc/syslib/ibm440gx_common.c b/arch/ppc/syslib/ibm440gx_common.c
new file mode 100644
index 00000000000..4ad85e0e023
--- /dev/null
+++ b/arch/ppc/syslib/ibm440gx_common.c
@@ -0,0 +1,270 @@
+/*
+ * 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;
+}
+
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