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-rw-r--r--arch/powerpc/sysdev/ppc4xx_soc.c222
1 files changed, 222 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/ppc4xx_soc.c b/arch/powerpc/sysdev/ppc4xx_soc.c
new file mode 100644
index 000000000..5c77c9ba3
--- /dev/null
+++ b/arch/powerpc/sysdev/ppc4xx_soc.c
@@ -0,0 +1,222 @@
+/*
+ * IBM/AMCC PPC4xx SoC setup code
+ *
+ * Copyright 2008 DENX Software Engineering, Stefan Roese <sr@denx.de>
+ *
+ * L2 cache routines cloned from arch/ppc/syslib/ibm440gx_common.c which is:
+ * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
+ * Copyright (c) 2003 - 2006 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/stddef.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+
+#include <asm/dcr.h>
+#include <asm/dcr-regs.h>
+#include <asm/reg.h>
+
+static u32 dcrbase_l2c;
+
+/*
+ * L2-cache
+ */
+
+/* Issue L2C diagnostic command */
+static inline u32 l2c_diag(u32 addr)
+{
+ mtdcr(dcrbase_l2c + DCRN_L2C0_ADDR, addr);
+ mtdcr(dcrbase_l2c + DCRN_L2C0_CMD, L2C_CMD_DIAG);
+ while (!(mfdcr(dcrbase_l2c + DCRN_L2C0_SR) & L2C_SR_CC))
+ ;
+
+ return mfdcr(dcrbase_l2c + DCRN_L2C0_DATA);
+}
+
+static irqreturn_t l2c_error_handler(int irq, void *dev)
+{
+ u32 sr = mfdcr(dcrbase_l2c + 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(dcrbase_l2c + DCRN_L2C0_ADDR, 0);
+ mtdcr(dcrbase_l2c + DCRN_L2C0_CMD, L2C_CMD_CCP | L2C_CMD_CTE);
+ } else {
+ printk(KERN_EMERG "L2C: LRU error\n");
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int __init ppc4xx_l2c_probe(void)
+{
+ struct device_node *np;
+ u32 r;
+ unsigned long flags;
+ int irq;
+ const u32 *dcrreg;
+ u32 dcrbase_isram;
+ int len;
+ const u32 *prop;
+ u32 l2_size;
+
+ np = of_find_compatible_node(NULL, NULL, "ibm,l2-cache");
+ if (!np)
+ return 0;
+
+ /* Get l2 cache size */
+ prop = of_get_property(np, "cache-size", NULL);
+ if (prop == NULL) {
+ printk(KERN_ERR "%s: Can't get cache-size!\n", np->full_name);
+ of_node_put(np);
+ return -ENODEV;
+ }
+ l2_size = prop[0];
+
+ /* Map DCRs */
+ dcrreg = of_get_property(np, "dcr-reg", &len);
+ if (!dcrreg || (len != 4 * sizeof(u32))) {
+ printk(KERN_ERR "%s: Can't get DCR register base !",
+ np->full_name);
+ of_node_put(np);
+ return -ENODEV;
+ }
+ dcrbase_isram = dcrreg[0];
+ dcrbase_l2c = dcrreg[2];
+
+ /* Get and map irq number from device tree */
+ irq = irq_of_parse_and_map(np, 0);
+ if (irq == NO_IRQ) {
+ printk(KERN_ERR "irq_of_parse_and_map failed\n");
+ of_node_put(np);
+ return -ENODEV;
+ }
+
+ /* Install error handler */
+ if (request_irq(irq, l2c_error_handler, 0, "L2C", 0) < 0) {
+ printk(KERN_ERR "Cannot install L2C error handler"
+ ", cache is not enabled\n");
+ of_node_put(np);
+ return -ENODEV;
+ }
+
+ local_irq_save(flags);
+ asm volatile ("sync" ::: "memory");
+
+ /* Disable SRAM */
+ mtdcr(dcrbase_isram + DCRN_SRAM0_DPC,
+ mfdcr(dcrbase_isram + DCRN_SRAM0_DPC) & ~SRAM_DPC_ENABLE);
+ mtdcr(dcrbase_isram + DCRN_SRAM0_SB0CR,
+ mfdcr(dcrbase_isram + DCRN_SRAM0_SB0CR) & ~SRAM_SBCR_BU_MASK);
+ mtdcr(dcrbase_isram + DCRN_SRAM0_SB1CR,
+ mfdcr(dcrbase_isram + DCRN_SRAM0_SB1CR) & ~SRAM_SBCR_BU_MASK);
+ mtdcr(dcrbase_isram + DCRN_SRAM0_SB2CR,
+ mfdcr(dcrbase_isram + DCRN_SRAM0_SB2CR) & ~SRAM_SBCR_BU_MASK);
+ mtdcr(dcrbase_isram + DCRN_SRAM0_SB3CR,
+ mfdcr(dcrbase_isram + DCRN_SRAM0_SB3CR) & ~SRAM_SBCR_BU_MASK);
+
+ /* Enable L2_MODE without ICU/DCU */
+ r = mfdcr(dcrbase_l2c + DCRN_L2C0_CFG) &
+ ~(L2C_CFG_ICU | L2C_CFG_DCU | L2C_CFG_SS_MASK);
+ r |= L2C_CFG_L2M | L2C_CFG_SS_256;
+ mtdcr(dcrbase_l2c + DCRN_L2C0_CFG, r);
+
+ mtdcr(dcrbase_l2c + DCRN_L2C0_ADDR, 0);
+
+ /* Hardware Clear Command */
+ mtdcr(dcrbase_l2c + DCRN_L2C0_CMD, L2C_CMD_HCC);
+ while (!(mfdcr(dcrbase_l2c + DCRN_L2C0_SR) & L2C_SR_CC))
+ ;
+
+ /* Clear Cache Parity and Tag Errors */
+ mtdcr(dcrbase_l2c + DCRN_L2C0_CMD, L2C_CMD_CCP | L2C_CMD_CTE);
+
+ /* Enable 64G snoop region starting at 0 */
+ r = mfdcr(dcrbase_l2c + DCRN_L2C0_SNP0) &
+ ~(L2C_SNP_BA_MASK | L2C_SNP_SSR_MASK);
+ r |= L2C_SNP_SSR_32G | L2C_SNP_ESR;
+ mtdcr(dcrbase_l2c + DCRN_L2C0_SNP0, r);
+
+ r = mfdcr(dcrbase_l2c + DCRN_L2C0_SNP1) &
+ ~(L2C_SNP_BA_MASK | L2C_SNP_SSR_MASK);
+ r |= 0x80000000 | L2C_SNP_SSR_32G | L2C_SNP_ESR;
+ mtdcr(dcrbase_l2c + DCRN_L2C0_SNP1, r);
+
+ asm volatile ("sync" ::: "memory");
+
+ /* Enable ICU/DCU ports */
+ r = mfdcr(dcrbase_l2c + 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;
+
+ /* Check for 460EX/GT special handling */
+ if (of_device_is_compatible(np, "ibm,l2-cache-460ex") ||
+ of_device_is_compatible(np, "ibm,l2-cache-460gt"))
+ r |= L2C_CFG_RDBW;
+
+ mtdcr(dcrbase_l2c + DCRN_L2C0_CFG, r);
+
+ asm volatile ("sync; isync" ::: "memory");
+ local_irq_restore(flags);
+
+ printk(KERN_INFO "%dk L2-cache enabled\n", l2_size >> 10);
+
+ of_node_put(np);
+ return 0;
+}
+arch_initcall(ppc4xx_l2c_probe);
+
+/*
+ * Apply a system reset. Alternatively a board specific value may be
+ * provided via the "reset-type" property in the cpu node.
+ */
+void ppc4xx_reset_system(char *cmd)
+{
+ struct device_node *np;
+ u32 reset_type = DBCR0_RST_SYSTEM;
+ const u32 *prop;
+
+ np = of_find_node_by_type(NULL, "cpu");
+ if (np) {
+ prop = of_get_property(np, "reset-type", NULL);
+
+ /*
+ * Check if property exists and if it is in range:
+ * 1 - PPC4xx core reset
+ * 2 - PPC4xx chip reset
+ * 3 - PPC4xx system reset (default)
+ */
+ if ((prop) && ((prop[0] >= 1) && (prop[0] <= 3)))
+ reset_type = prop[0] << 28;
+ }
+
+ mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | reset_type);
+
+ while (1)
+ ; /* Just in case the reset doesn't work */
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-05 21:53:45 +0000