powerpc/32s: Make support for 603 and 604+ selectable

book3s/32 has two main families:
- CPU with 603 cores that don't have HASH PTE table and
perform SW TLB loading.
- Other CPUs based on 604+ cores that have HASH PTE table.

This leads to some complex logic and additionnal code to
support both. This makes sense for distribution kernels
that aim at running on any CPU, but when you are fine
tuning a kernel for an embedded 603 based board you
don't need all the HASH logic.

Allow selection of support for each family, in order to opt
out unneeded parts of code. At least one must be selected.

Note that some of the CPU supporting HASH also support SW TLB
loading, however it is not supported by Linux kernel at the
time being, because they do not have alternate registers in
the TLB miss exception handlers.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/8dde0cdb629a71abc29b0d85a52a86e920376cb6.1603348103.git.christophe.leroy@csgroup.eu

diff --git a/arch/powerpc/include/asm/cputable.h b/arch/powerpc/include/asm/cputable.h
index b088c34..5f21a5b 100644 (file)
--- a/arch/powerpc/include/asm/cputable.h
+++ b/arch/powerpc/include/asm/cputable.h
@@ -502,7 +502,7 @@ static inline void cpu_feature_keys_init(void) { }
 #else
 enum {
        CPU_FTRS_POSSIBLE =
-#ifdef CONFIG_PPC_BOOK3S_32
+#ifdef CONFIG_PPC_BOOK3S_604
            CPU_FTRS_604 | CPU_FTRS_740_NOTAU |
            CPU_FTRS_740 | CPU_FTRS_750 | CPU_FTRS_750FX1 |
            CPU_FTRS_750FX2 | CPU_FTRS_750FX | CPU_FTRS_750GX |
@@ -511,6 +511,8 @@ enum {
            CPU_FTRS_7455_20 | CPU_FTRS_7455 | CPU_FTRS_7447_10 |
            CPU_FTRS_7447 | CPU_FTRS_7447A |
            CPU_FTRS_CLASSIC32 |
+#endif
+#ifdef CONFIG_PPC_BOOK3S_603
            CPU_FTRS_603 | CPU_FTRS_82XX |
            CPU_FTRS_G2_LE | CPU_FTRS_E300 | CPU_FTRS_E300C2 |
 #endif
@@ -572,7 +574,7 @@ enum {
 #else
 enum {
        CPU_FTRS_ALWAYS =
-#ifdef CONFIG_PPC_BOOK3S_32
+#ifdef CONFIG_PPC_BOOK3S_604
            CPU_FTRS_604 & CPU_FTRS_740_NOTAU &
            CPU_FTRS_740 & CPU_FTRS_750 & CPU_FTRS_750FX1 &
            CPU_FTRS_750FX2 & CPU_FTRS_750FX & CPU_FTRS_750GX &
@@ -581,6 +583,8 @@ enum {
            CPU_FTRS_7455_20 & CPU_FTRS_7455 & CPU_FTRS_7447_10 &
            CPU_FTRS_7447 & CPU_FTRS_7447A &
            CPU_FTRS_CLASSIC32 &
+#endif
+#ifdef CONFIG_PPC_BOOK3S_603
            CPU_FTRS_603 & CPU_FTRS_82XX &
            CPU_FTRS_G2_LE & CPU_FTRS_E300 & CPU_FTRS_E300C2 &
 #endif

diff --git a/arch/powerpc/include/asm/mmu.h b/arch/powerpc/include/asm/mmu.h
index ebf5028..80b27f5 100644 (file)
--- a/arch/powerpc/include/asm/mmu.h
+++ b/arch/powerpc/include/asm/mmu.h
@@ -157,7 +157,7 @@ DECLARE_PER_CPU(int, next_tlbcam_idx);
 
 enum {
        MMU_FTRS_POSSIBLE =
-#ifdef CONFIG_PPC_BOOK3S
+#if defined(CONFIG_PPC_BOOK3S_64) || defined(CONFIG_PPC_BOOK3S_604)
                MMU_FTR_HPTE_TABLE |
 #endif
 #ifdef CONFIG_PPC_8xx
@@ -206,6 +206,9 @@ enum {
                0,
 };
 
+#if defined(CONFIG_PPC_BOOK3S_604) && !defined(CONFIG_PPC_BOOK3S_603)
+#define MMU_FTRS_ALWAYS                MMU_FTR_HPTE_TABLE
+#endif
 #ifdef CONFIG_PPC_8xx
 #define MMU_FTRS_ALWAYS                MMU_FTR_TYPE_8xx
 #endif

diff --git a/arch/powerpc/kernel/cputable.c b/arch/powerpc/kernel/cputable.c
index 5bf971f..65f35ec 100644 (file)
--- a/arch/powerpc/kernel/cputable.c
+++ b/arch/powerpc/kernel/cputable.c
@@ -612,6 +612,7 @@ static struct cpu_spec __initdata cpu_specs[] = {
 
 #ifdef CONFIG_PPC32
 #ifdef CONFIG_PPC_BOOK3S_32
+#ifdef CONFIG_PPC_BOOK3S_604
        {       /* 604 */
                .pvr_mask               = 0xffff0000,
                .pvr_value              = 0x00040000,
@@ -1101,6 +1102,8 @@ static struct cpu_spec __initdata cpu_specs[] = {
                .machine_check          = machine_check_generic,
                .platform               = "ppc7450",
        },
+#endif /* CONFIG_PPC_BOOK3S_604 */
+#ifdef CONFIG_PPC_BOOK3S_603
        {       /* 603 */
                .pvr_mask               = 0xffff0000,
                .pvr_value              = 0x00030000,
@@ -1229,6 +1232,8 @@ static struct cpu_spec __initdata cpu_specs[] = {
                .platform               = "ppc603",
        },
 #endif
+#endif /* CONFIG_PPC_BOOK3S_603 */
+#ifdef CONFIG_PPC_BOOK3S_604
        {       /* default match, we assume split I/D cache & TB (non-601)... */
                .pvr_mask               = 0x00000000,
                .pvr_value              = 0x00000000,
@@ -1241,6 +1246,7 @@ static struct cpu_spec __initdata cpu_specs[] = {
                .machine_check          = machine_check_generic,
                .platform               = "ppc603",
        },
+#endif /* CONFIG_PPC_BOOK3S_604 */
 #endif /* CONFIG_PPC_BOOK3S_32 */
 #ifdef CONFIG_PPC_8xx
        {       /* 8xx */

diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index 14a8481..3ce9075 100644 (file)
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -64,6 +64,22 @@ config 44x
 
 endchoice
 
+config PPC_BOOK3S_603
+       bool "Support for 603 SW loaded TLB"
+       depends on PPC_BOOK3S_32
+       default y
+       help
+         Provide support for processors based on the 603 cores. Those
+         processors don't have a HASH MMU and provide SW TLB loading.
+
+config PPC_BOOK3S_604
+       bool "Support for 604+ HASH MMU" if PPC_BOOK3S_603
+       depends on PPC_BOOK3S_32
+       default y
+       help
+         Provide support for processors not based on the 603 cores.
+         Those processors have a HASH MMU.
+
 choice
        prompt "Processor Type"
        depends on PPC64