[POWERPC] 4xx: Add 405GPr and 405EP support in boot wrapper

This patch adds support for 405GPr processors with optional
new mode strapping. ibm405gp_fixup_clocks() can now be used
for 405GP and 405GPr CPUs.

This is in preparation of porting the cpci405 platform support
from arch/ppc to arch/powerpc.

This patch also adds ibm405ep_fixup_clocks() to support
405EP CPUs from the boot wrapper.

Signed-off-by: Matthias Fuchs <matthias.fuchs@esd-electronics.com>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>

3 files changed, 80 insertions, 7 deletions

diff --git a/arch/powerpc/boot/4xx.c b/arch/powerpc/boot/4xx.c
index 33f25b671340..61a4045324cb 100644
--- a/arch/powerpc/boot/4xx.c
+++ b/arch/powerpc/boot/4xx.c
@@ -499,20 +499,45 @@ void ibm405gp_fixup_clocks(unsigned int sys_clk, unsigned int ser_clk)
         u32 pllmr = mfdcr(DCRN_CPC0_PLLMR);
         u32 cpc0_cr0 = mfdcr(DCRN_405_CPC0_CR0);
         u32 cpc0_cr1 = mfdcr(DCRN_405_CPC0_CR1);
+        u32 psr = mfdcr(DCRN_405_CPC0_PSR);
         u32 cpu, plb, opb, ebc, tb, uart0, uart1, m;
-        u32 fwdv, fbdv, cbdv, opdv, epdv, udiv;
+        u32 fwdv, fwdvb, fbdv, cbdv, opdv, epdv, ppdv, udiv;
 
         fwdv = (8 - ((pllmr & 0xe0000000) >> 29));
         fbdv = (pllmr & 0x1e000000) >> 25;
-        cbdv = ((pllmr & 0x00060000) >> 17) + 1;
-        opdv = ((pllmr & 0x00018000) >> 15) + 1;
-        epdv = ((pllmr & 0x00001800) >> 13) + 2;
+        if (fbdv == 0)
+                fbdv = 16;
+        cbdv = ((pllmr & 0x00060000) >> 17) + 1; /* CPU:PLB */
+        opdv = ((pllmr & 0x00018000) >> 15) + 1; /* PLB:OPB */
+        ppdv = ((pllmr & 0x00001800) >> 13) + 1; /* PLB:PCI */
+        epdv = ((pllmr & 0x00001800) >> 11) + 2; /* PLB:EBC */
         udiv = ((cpc0_cr0 & 0x3e) >> 1) + 1;
 
-        m = fwdv * fbdv * cbdv;
+        /* check for 405GPr */
+        if ((mfpvr() & 0xfffffff0) == (0x50910951 & 0xfffffff0)) {
+                fwdvb = 8 - (pllmr & 0x00000007);
+                if (!(psr & 0x00001000)) /* PCI async mode enable == 0 */
+                        if (psr & 0x00000020) /* New mode enable */
+                                m = fwdvb * 2 * ppdv;
+                        else
+                                m = fwdvb * cbdv * ppdv;
+                else if (psr & 0x00000020) /* New mode enable */
+                        if (psr & 0x00000800) /* PerClk synch mode */
+                                m = fwdvb * 2 * epdv;
+                        else
+                                m = fbdv * fwdv;
+                else if (epdv == fbdv)
+                        m = fbdv * cbdv * epdv;
+                else
+                        m = fbdv * fwdvb * cbdv;
 
-        cpu = sys_clk * m / fwdv;
-        plb = cpu / cbdv;
+                cpu = sys_clk * m / fwdv;
+                plb = sys_clk * m / (fwdvb * cbdv);
+        } else {
+                m = fwdv * fbdv * cbdv;
+                cpu = sys_clk * m / fwdv;
+                plb = cpu / cbdv;
+        }
         opb = plb / opdv;
         ebc = plb / epdv;
 
@@ -541,3 +566,45 @@ void ibm405gp_fixup_clocks(unsigned int sys_clk, unsigned int ser_clk)
         dt_fixup_clock("/plb/opb/serial@ef600400", uart1);
 }
 
+
+void ibm405ep_fixup_clocks(unsigned int sys_clk)
+{
+        u32 pllmr0 = mfdcr(DCRN_CPC0_PLLMR0);
+        u32 pllmr1 = mfdcr(DCRN_CPC0_PLLMR1);
+        u32 cpc0_ucr = mfdcr(DCRN_CPC0_UCR);
+        u32 cpu, plb, opb, ebc, uart0, uart1;
+        u32 fwdva, fwdvb, fbdv, cbdv, opdv, epdv;
+        u32 pllmr0_ccdv, tb, m;
+
+        fwdva = 8 - ((pllmr1 & 0x00070000) >> 16);
+        fwdvb = 8 - ((pllmr1 & 0x00007000) >> 12);
+        fbdv = (pllmr1 & 0x00f00000) >> 20;
+        if (fbdv == 0)
+                fbdv = 16;
+
+        cbdv = ((pllmr0 & 0x00030000) >> 16) + 1; /* CPU:PLB */
+        epdv = ((pllmr0 & 0x00000300) >> 8) + 2;  /* PLB:EBC */
+        opdv = ((pllmr0 & 0x00003000) >> 12) + 1; /* PLB:OPB */
+
+        m = fbdv * fwdvb;
+
+        pllmr0_ccdv = ((pllmr0 & 0x00300000) >> 20) + 1;
+        if (pllmr1 & 0x80000000)
+                cpu = sys_clk * m / (fwdva * pllmr0_ccdv);
+        else
+                cpu = sys_clk / pllmr0_ccdv;
+
+        plb = cpu / cbdv;
+        opb = plb / opdv;
+        ebc = plb / epdv;
+        tb = cpu;
+        uart0 = cpu / (cpc0_ucr & 0x0000007f);
+        uart1 = cpu / ((cpc0_ucr & 0x00007f00) >> 8);
+
+        dt_fixup_cpu_clocks(cpu, tb, 0);
+        dt_fixup_clock("/plb", plb);
+        dt_fixup_clock("/plb/opb", opb);
+        dt_fixup_clock("/plb/ebc", ebc);
+        dt_fixup_clock("/plb/opb/serial@ef600300", uart0);
+        dt_fixup_clock("/plb/opb/serial@ef600400", uart1);
+}
diff --git a/arch/powerpc/boot/4xx.h b/arch/powerpc/boot/4xx.h
index fbe0632621ca..2606e64f0c4b 100644
--- a/arch/powerpc/boot/4xx.h
+++ b/arch/powerpc/boot/4xx.h
@@ -20,6 +20,7 @@ void ibm4xx_quiesce_eth(u32 *emac0, u32 *emac1);
 void ibm4xx_fixup_ebc_ranges(const char *ebc);
 
 void ibm405gp_fixup_clocks(unsigned int sys_clk, unsigned int ser_clk);
+void ibm405ep_fixup_clocks(unsigned int sys_clk);
 void ibm440gp_fixup_clocks(unsigned int sys_clk, unsigned int ser_clk);
 void ibm440ep_fixup_clocks(unsigned int sys_clk, unsigned int ser_clk,
                            unsigned int tmr_clk);
diff --git a/arch/powerpc/boot/dcr.h b/arch/powerpc/boot/dcr.h
index 55655f78505a..95b9f5344016 100644
--- a/arch/powerpc/boot/dcr.h
+++ b/arch/powerpc/boot/dcr.h
@@ -146,7 +146,12 @@ static const unsigned long sdram_bxcr[] = { SDRAM0_B0CR, SDRAM0_B1CR,
 #define DCRN_CPC0_PLLMR 0xb0
 #define DCRN_405_CPC0_CR0 0xb1
 #define DCRN_405_CPC0_CR1 0xb2
+#define DCRN_405_CPC0_PSR 0xb4
 
+/* 405EP Clocking/Power Management/Chip Control regs */
+#define DCRN_CPC0_PLLMR0  0xf0
+#define DCRN_CPC0_PLLMR1  0xf4
+#define DCRN_CPC0_UCR     0xf5
 
 /* 440GX Clock control etc */