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Subject[PATCH 3/4] Various arch/powerpc changes to support the 750GX cpufreq driver
This patch includes various changes necessary to support the cpufreq driver for
the PowerPC 750GX. Highlights include adding entries to recognize the 750GX to
the cputable (This includes the ... unfortunate pvr that the 750GX used in the
PowerLogix PowerForce 750GX => 0x0008 0203). The PLL switch in idle_6xx.S
during sleep (or nap) was also removed (I tried to add ability to disable this
but the result would not boot?).

My name is Kevin Diggs and I approve this patch.

Signed-off-by: Kevin Diggs <kevdig@hypersurf.com>
Index: arch/powerpc/kernel/Makefile
===================================================================
--- arch/powerpc/kernel/Makefile.orig 2008-08-13 02:19:18.000000000 -0700
+++ arch/powerpc/kernel/Makefile 2008-08-14 02:50:18.000000000 -0700
@@ -17,6 +17,7 @@ obj-y := cputable.o ptrace.o syscalls
init_task.o process.o systbl.o idle.o \
signal.o
obj-y += vdso32/
+obj-y += cpu/
obj-$(CONFIG_PPC64) += setup_64.o sys_ppc32.o \
signal_64.o ptrace32.o \
paca.o cpu_setup_ppc970.o \
Index: arch/powerpc/kernel/cputable.c
===================================================================
--- arch/powerpc/kernel/cputable.c.orig 2008-08-13 02:19:19.000000000 -0700
+++ arch/powerpc/kernel/cputable.c 2008-08-14 03:00:51.000000000 -0700
@@ -42,9 +42,11 @@ extern void __setup_cpu_604(unsigned lon
extern void __setup_cpu_750(unsigned long offset, struct cpu_spec* spec);
extern void __setup_cpu_750cx(unsigned long offset, struct cpu_spec* spec);
extern void __setup_cpu_750fx(unsigned long offset, struct cpu_spec* spec);
+extern void __setup_cpu_750gx(unsigned long offset, struct cpu_spec* spec);
extern void __setup_cpu_7400(unsigned long offset, struct cpu_spec* spec);
extern void __setup_cpu_7410(unsigned long offset, struct cpu_spec* spec);
extern void __setup_cpu_745x(unsigned long offset, struct cpu_spec* spec);
+
#endif /* CONFIG_PPC32 */
#ifdef CONFIG_PPC64
extern void __setup_cpu_ppc970(unsigned long offset, struct cpu_spec* spec);
@@ -660,7 +662,7 @@ static struct cpu_spec __initdata cpu_sp
.machine_check = machine_check_generic,
.platform = "ppc750",
},
- { /* 750GX */
+ { /* 750GX rev 1.x */
.pvr_mask = 0xffff0000,
.pvr_value = 0x70020000,
.cpu_name = "750GX",
@@ -669,7 +671,33 @@ static struct cpu_spec __initdata cpu_sp
.icache_bsize = 32,
.dcache_bsize = 32,
.num_pmcs = 4,
- .cpu_setup = __setup_cpu_750fx,
+ .cpu_setup = __setup_cpu_750gx,
+ .machine_check = machine_check_generic,
+ .platform = "ppc750",
+ },
+ { /* 750GX (rev 2.3, as used on PowerLogix 750GX upgrade card */
+ .pvr_mask = 0xffffffff,
+ .pvr_value = 0x00080203,
+ .cpu_name = "750GX",
+ .cpu_features = CPU_FTRS_750GX,
+ .cpu_user_features = COMMON_USER | PPC_FEATURE_PPC_LE,
+ .icache_bsize = 32,
+ .dcache_bsize = 32,
+ .num_pmcs = 4,
+ .cpu_setup = __setup_cpu_750gx,
+ .machine_check = machine_check_generic,
+ .platform = "ppc750",
+ },
+ { /* 750GX (All revs >= 2.0) */
+ .pvr_mask = 0xffffff00,
+ .pvr_value = 0x70020200,
+ .cpu_name = "750GX",
+ .cpu_features = CPU_FTRS_750GX,
+ .cpu_user_features = COMMON_USER | PPC_FEATURE_PPC_LE,
+ .icache_bsize = 32,
+ .dcache_bsize = 32,
+ .num_pmcs = 4,
+ .cpu_setup = __setup_cpu_750gx,
.machine_check = machine_check_generic,
.platform = "ppc750",
},
Index: arch/powerpc/kernel/cpu_setup_6xx.S
===================================================================
--- arch/powerpc/kernel/cpu_setup_6xx.S.orig 2008-08-13 02:19:19.000000000 -0700
+++ arch/powerpc/kernel/cpu_setup_6xx.S 2008-08-14 02:44:30.000000000 -0700
@@ -53,6 +53,14 @@ _GLOBAL(__setup_cpu_750fx)
bl setup_750fx
mtlr r4
blr
+_GLOBAL(__setup_cpu_750gx)
+ mflr r4
+ bl __init_fpu_registers
+ bl setup_common_caches
+ bl setup_750_7400_hid0
+ bl setup_750gx
+ mtlr r4
+ blr
_GLOBAL(__setup_cpu_7400)
mflr r4
bl __init_fpu_registers
@@ -200,6 +208,11 @@ setup_750cx:
setup_750fx:
blr

+/* 750gx specific
+ */
+setup_750gx:
+ blr
+
/* MPC 745x
* Enable Store Gathering (SGE), Branch Folding (FOLD)
* Branch History Table (BHTE), Branch Target ICache (BTIC)
Index: arch/powerpc/kernel/idle_6xx.S
===================================================================
--- arch/powerpc/kernel/idle_6xx.S.orig 2008-02-25 18:10:30.000000000 -0800
+++ arch/powerpc/kernel/idle_6xx.S 2008-08-14 02:44:30.000000000 -0700
@@ -45,11 +45,6 @@ BEGIN_FTR_SECTION
addis r6,r5, nap_save_msscr0@ha
stw r4,nap_save_msscr0@l(r6)
END_FTR_SECTION_IFSET(CPU_FTR_NAP_DISABLE_L2_PR)
-BEGIN_FTR_SECTION
- mfspr r4,SPRN_HID1
- addis r6,r5,nap_save_hid1@ha
- stw r4,nap_save_hid1@l(r6)
-END_FTR_SECTION_IFSET(CPU_FTR_DUAL_PLL_750FX)
blr

/*
@@ -107,18 +102,6 @@ BEGIN_FTR_SECTION
dcbf 0,r4
END_FTR_SECTION_IFSET(CPU_FTR_NAP_DISABLE_L2_PR)
2:
-BEGIN_FTR_SECTION
- /* Go to low speed mode on some 750FX */
- lis r4,powersave_lowspeed@ha
- lwz r4,powersave_lowspeed@l(r4)
- cmpwi 0,r4,0
- beq 1f
- mfspr r4,SPRN_HID1
- oris r4,r4,0x0001
- mtspr SPRN_HID1,r4
-1:
-END_FTR_SECTION_IFSET(CPU_FTR_DUAL_PLL_750FX)
-
/* Go to NAP or DOZE now */
mfspr r4,SPRN_HID0
lis r5,(HID0_NAP|HID0_SLEEP)@h
@@ -178,20 +161,9 @@ BEGIN_FTR_SECTION
isync
1:
END_FTR_SECTION_IFSET(CPU_FTR_NAP_DISABLE_L2_PR)
-BEGIN_FTR_SECTION
- addis r9,r11,(nap_save_hid1-KERNELBASE)@ha
- lwz r9,nap_save_hid1@l(r9)
- mtspr SPRN_HID1, r9
-END_FTR_SECTION_IFSET(CPU_FTR_DUAL_PLL_750FX)
b transfer_to_handler_cont

.data

_GLOBAL(nap_save_msscr0)
.space 4*NR_CPUS
-
-_GLOBAL(nap_save_hid1)
- .space 4*NR_CPUS
-
-_GLOBAL(powersave_lowspeed)
- .long 0
Index: arch/powerpc/platforms/powermac/feature.c
===================================================================
--- arch/powerpc/platforms/powermac/feature.c.orig 2008-08-13 00:54:02.000000000 -0700
+++ arch/powerpc/platforms/powermac/feature.c 2008-08-14 02:44:30.000000000 -0700
@@ -48,10 +48,6 @@
#define DBG(fmt...)
#endif

-#ifdef CONFIG_6xx
-extern int powersave_lowspeed;
-#endif
-
extern int powersave_nap;
extern struct device_node *k2_skiplist[2];

@@ -2534,11 +2530,6 @@ found:
break;
}

- /* On CPUs that support it (750FX), lowspeed by default during
- * NAP mode
- */
- powersave_lowspeed = 1;
-
#else /* CONFIG_POWER4 */
powersave_nap = 1;
#endif /* CONFIG_POWER4 */
Index: arch/powerpc/platforms/Kconfig
===================================================================
--- arch/powerpc/platforms/Kconfig.orig 2008-08-13 02:19:26.000000000 -0700
+++ arch/powerpc/platforms/Kconfig 2008-08-14 02:44:30.000000000 -0700
@@ -174,7 +174,7 @@ config GENERIC_IOMAP
bool
default n

-source "drivers/cpufreq/Kconfig"
+source "arch/powerpc/kernel/cpu/cpufreq/Kconfig"

menu "CPU Frequency drivers"
depends on CPU_FREQ
Index: arch/powerpc/platforms/Kconfig.cputype
===================================================================
--- arch/powerpc/platforms/Kconfig.cputype.orig 2008-08-13 02:19:26.000000000 -0700
+++ arch/powerpc/platforms/Kconfig.cputype 2008-08-14 02:44:30.000000000 -0700
@@ -234,4 +234,34 @@ config NOT_COHERENT_CACHE
config CHECK_CACHE_COHERENCY
bool

+config PPC_750GX_DUAL_PLL_IF
+ tristate 'Add interface for 750GX PLL' if 6xx
+ ---help---
+ This adds code to provide control of the pll config register in IBM
+ 750GX (and FX?). This is also needed by the cpufreq driver for the
+ 750GX. At least one of the interfaces below must be selected.
+
+ If in doubt, say N here.
+
+config PPC_750GX_DUAL_PLL_IF_HRTIMER
+ bool "Use HRtimer for PLL lock delay"
+ depends on PPC_750GX_DUAL_PLL_IF
+ default n
+ help
+ Uses HRtimers for lower latency on PLL locks.
+
+config PPC_750GX_DUAL_PLL_IF_CPU_FREQ
+ bool "Include CPUFreq interface"
+ depends on PPC_750GX_DUAL_PLL_IF
+ default n
+ help
+ Include code to provide CPUFreq driver API.
+
+config PPC_750GX_DUAL_PLL_IF_SYSFS
+ bool "Include sysfs interface"
+ depends on PPC_750GX_DUAL_PLL_IF
+ default n
+ help
+ Include code to provide sysfs interface.
+
endmenu
Index: include/asm-powerpc/cputable.h
===================================================================
--- include/asm-powerpc/cputable.h.orig 2008-08-13 00:56:46.000000000 -0700
+++ include/asm-powerpc/cputable.h 2008-08-14 02:44:30.000000000 -0700
@@ -263,7 +263,8 @@ extern void do_feature_fixups(unsigned l
#define CPU_FTRS_750FX2 (CPU_FTRS_750 | CPU_FTR_NO_DPM)
#define CPU_FTRS_750FX (CPU_FTRS_750 | CPU_FTR_DUAL_PLL_750FX | \
CPU_FTR_HAS_HIGH_BATS)
-#define CPU_FTRS_750GX (CPU_FTRS_750FX)
+#define CPU_FTRS_750GX (CPU_FTRS_750 | CPU_FTR_DUAL_PLL_750FX | \
+ CPU_FTR_HAS_HIGH_BATS)
#define CPU_FTRS_7400_NOTAU (CPU_FTR_COMMON | \
CPU_FTR_MAYBE_CAN_DOZE | CPU_FTR_USE_TB | CPU_FTR_L2CR | \
CPU_FTR_ALTIVEC_COMP | CPU_FTR_HPTE_TABLE | \

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