[PATCH v3] powerpc: remove dead 440SP code
From: Julian Braha
Date: Tue Sep 01 2026 - 13:08:10 EST
The 440SP config option can never be enabled, making all references to it
dead code.
The only board using CONFIG_440SP was IBM LUAN, which was commented out by
commit f65573314e4e ("[POWERPC] Re-organize Kconfig code for 4xx in
arch/powerpc") then removed by commit ff5f483f3091 ("powerpc: 4xx: remove
commented out Kconfig entries").
Let's remove support for 440SP, since nobody can be using it anyway.
This dead code was found by kconfirm, a static analysis tool for Kconfig.
Signed-off-by: Julian Braha <julianbraha@xxxxxxxxx>
---
Changes since v2:
- cleaned up preprocessor condition
Link to v2:
https://lore.kernel.org/all/20260901150645.1199097-1-julianbraha@xxxxxxxxx/
Changes since v1:
- added historic details to description
Link to v1:
https://lore.kernel.org/all/20260816125615.985387-1-julianbraha@xxxxxxxxx/
---
arch/powerpc/boot/cuboot-katmai.c | 2 +-
arch/powerpc/include/asm/async_tx.h | 2 +-
arch/powerpc/include/asm/dcr-regs.h | 10 +++++-----
arch/powerpc/kernel/cpu_specs_44x.h | 12 ------------
arch/powerpc/platforms/44x/Kconfig | 3 ---
drivers/dma/Kconfig | 2 +-
drivers/dma/ppc4xx/adma.c | 9 ---------
drivers/dma/ppc4xx/adma.h | 2 +-
drivers/dma/ppc4xx/dma.h | 9 ---------
drivers/net/ethernet/ibm/emac/mal.h | 2 +-
10 files changed, 10 insertions(+), 43 deletions(-)
diff --git a/arch/powerpc/boot/cuboot-katmai.c b/arch/powerpc/boot/cuboot-katmai.c
index 034a748fde24..fcd71e76309f 100644
--- a/arch/powerpc/boot/cuboot-katmai.c
+++ b/arch/powerpc/boot/cuboot-katmai.c
@@ -31,7 +31,7 @@ static void katmai_fixups(void)
{
unsigned long sysclk = 33333000;
- /* 440SP Clock logic is all but identical to 440GX
+ /* 440SPe Clock logic is all but identical to 440GX
* so we just use that code for now at least
*/
ibm440spe_fixup_clocks(sysclk, 6 * 1843200, 0);
diff --git a/arch/powerpc/include/asm/async_tx.h b/arch/powerpc/include/asm/async_tx.h
index a14758426dd5..1ff5b2ca3ed1 100644
--- a/arch/powerpc/include/asm/async_tx.h
+++ b/arch/powerpc/include/asm/async_tx.h
@@ -7,7 +7,7 @@
#ifndef _ASM_POWERPC_ASYNC_TX_H_
#define _ASM_POWERPC_ASYNC_TX_H_
-#if defined(CONFIG_440SPe) || defined(CONFIG_440SP)
+#ifdef CONFIG_440SPe
extern struct dma_chan *
ppc440spe_async_tx_find_best_channel(enum dma_transaction_type cap,
struct page **dst_lst, int dst_cnt, struct page **src_lst,
diff --git a/arch/powerpc/include/asm/dcr-regs.h b/arch/powerpc/include/asm/dcr-regs.h
index 5c1a4973f46a..e39a55e527da 100644
--- a/arch/powerpc/include/asm/dcr-regs.h
+++ b/arch/powerpc/include/asm/dcr-regs.h
@@ -25,11 +25,11 @@
* of the driver main register set
*/
-/* CPRs (440GX and 440SP/440SPe) */
+/* CPRs (440GX and 440SPe) */
#define DCRN_CPR0_CONFIG_ADDR 0xc
#define DCRN_CPR0_CONFIG_DATA 0xd
-/* SDRs (440GX and 440SP/440SPe) */
+/* SDRs (440GX and 440SPe) */
#define DCRN_SDR0_CONFIG_ADDR 0xe
#define DCRN_SDR0_CONFIG_DATA 0xf
@@ -159,18 +159,18 @@
#define L2C_SNP_ESR 0x00000800
/*
- * DCR register offsets for 440SP/440SPe I2O/DMA controller.
+ * DCR register offsets for 440SPe I2O/DMA controller.
* The base address is configured in the device tree.
*/
#define DCRN_I2O0_IBAL 0x006
#define DCRN_I2O0_IBAH 0x007
#define I2O_REG_ENABLE 0x00000001 /* Enable I2O/DMA access */
-/* 440SP/440SPe Software Reset DCR */
+/* 440SPe Software Reset DCR */
#define DCRN_SDR0_SRST 0x0200
#define DCRN_SDR0_SRST_I2ODMA (0x80000000 >> 15) /* Reset I2O/DMA */
-/* 440SP/440SPe Memory Queue DCR offsets */
+/* 440SPe Memory Queue DCR offsets */
#define DCRN_MQ0_XORBA 0x04
#define DCRN_MQ0_CF2H 0x06
#define DCRN_MQ0_CFBHL 0x0f
diff --git a/arch/powerpc/kernel/cpu_specs_44x.h b/arch/powerpc/kernel/cpu_specs_44x.h
index 69c4cdc0cdee..41ed2c16d8cc 100644
--- a/arch/powerpc/kernel/cpu_specs_44x.h
+++ b/arch/powerpc/kernel/cpu_specs_44x.h
@@ -172,18 +172,6 @@ static struct cpu_spec cpu_specs[] __initdata = {
.machine_check = machine_check_440A,
.platform = "ppc440",
},
- { /* 440SP Rev. A */
- .pvr_mask = 0xfff00fff,
- .pvr_value = 0x53200891,
- .cpu_name = "440SP Rev. A",
- .cpu_features = CPU_FTRS_44X,
- .cpu_user_features = COMMON_USER_BOOKE,
- .mmu_features = MMU_FTR_TYPE_44x,
- .icache_bsize = 32,
- .dcache_bsize = 32,
- .machine_check = machine_check_4xx,
- .platform = "ppc440",
- },
{ /* 440SPe Rev. A */
.pvr_mask = 0xfff00fff,
.pvr_value = 0x53400890,
diff --git a/arch/powerpc/platforms/44x/Kconfig b/arch/powerpc/platforms/44x/Kconfig
index 150813cea945..b481ef2b0f4c 100644
--- a/arch/powerpc/platforms/44x/Kconfig
+++ b/arch/powerpc/platforms/44x/Kconfig
@@ -260,9 +260,6 @@ config 440GX
select IBM_EMAC_ZMII if IBM_EMAC #test only
select IBM_EMAC_TAH if IBM_EMAC #test only
-config 440SP
- bool
-
config 440SPe
bool
select IBM_EMAC_EMAC4 if IBM_EMAC
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index ae6a682c9f76..f0f61b4932f5 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -77,7 +77,7 @@ config AMBA_PL08X
config AMCC_PPC440SPE_ADMA
tristate "AMCC PPC440SPe ADMA support"
- depends on 440SPe || 440SP
+ depends on 440SPe
select DMA_ENGINE
select DMA_ENGINE_RAID
select ARCH_HAS_ASYNC_TX_FIND_CHANNEL
diff --git a/drivers/dma/ppc4xx/adma.c b/drivers/dma/ppc4xx/adma.c
index 279a431ccae3..ecbf4c84a318 100644
--- a/drivers/dma/ppc4xx/adma.c
+++ b/drivers/dma/ppc4xx/adma.c
@@ -4349,14 +4349,9 @@ static ssize_t poly_show(struct device_driver *dev, char *buf)
ssize_t size = 0;
u32 reg;
-#ifdef CONFIG_440SP
- /* 440SP has fixed polynomial */
- reg = 0x4d;
-#else
reg = dcr_read(ppc440spe_mq_dcr_host, DCRN_MQ0_CFBHL);
reg >>= MQ0_CFBHL_POLY;
reg &= 0xFF;
-#endif
size = sysfs_emit(buf, "PPC440SP(e) RAID-6 driver "
"uses 0x1%02x polynomial.\n", reg);
@@ -4368,10 +4363,6 @@ static ssize_t poly_store(struct device_driver *dev, const char *buf,
{
unsigned long reg, val;
int err;
-#ifdef CONFIG_440SP
- /* 440SP uses default 0x14D polynomial only */
- return -EINVAL;
-#endif
if (!count || count > 6)
return -EINVAL;
diff --git a/drivers/dma/ppc4xx/adma.h b/drivers/dma/ppc4xx/adma.h
index f8a5d7c1fb40..0ec35382d274 100644
--- a/drivers/dma/ppc4xx/adma.h
+++ b/drivers/dma/ppc4xx/adma.h
@@ -19,7 +19,7 @@
#define tx_to_ppc440spe_adma_slot(tx) \
container_of(tx, struct ppc440spe_adma_desc_slot, async_tx)
-/* Default polynomial (for 440SP is only available) */
+/* Default polynomial */
#define PPC440SPE_DEFAULT_POLY 0x4d
#define PPC440SPE_ADMA_ENGINES_NUM (XOR_ENGINES_NUM + DMA_ENGINES_NUM)
diff --git a/drivers/dma/ppc4xx/dma.h b/drivers/dma/ppc4xx/dma.h
index b5725481bfa6..17cbb2d1ee1c 100644
--- a/drivers/dma/ppc4xx/dma.h
+++ b/drivers/dma/ppc4xx/dma.h
@@ -70,20 +70,11 @@
#define DMA_CUED_XOR_BASE (0x10000000)
#define DMA_CUED_XOR_HB (0x00000008)
-
-#ifdef CONFIG_440SP
-#define DMA_CUED_MULT1_OFF 0
-#define DMA_CUED_MULT2_OFF 8
-#define DMA_CUED_MULT3_OFF 16
-#define DMA_CUED_REGION_OFF 24
-#define DMA_CUED_XOR_WIN_MSK (0xFC000000)
-#else
#define DMA_CUED_MULT1_OFF 2
#define DMA_CUED_MULT2_OFF 10
#define DMA_CUED_MULT3_OFF 18
#define DMA_CUED_REGION_OFF 26
#define DMA_CUED_XOR_WIN_MSK (0xF0000000)
-#endif
#define DMA_CUED_REGION_MSK 0x3
#define DMA_RXOR123 0x0
diff --git a/drivers/net/ethernet/ibm/emac/mal.h b/drivers/net/ethernet/ibm/emac/mal.h
index e0ddc41186a2..6cdd40bca2cd 100644
--- a/drivers/net/ethernet/ibm/emac/mal.h
+++ b/drivers/net/ethernet/ibm/emac/mal.h
@@ -26,7 +26,7 @@
* We call MAL 1 the version in 405GP, 405GPR, 405EP, 440EP, 440GR and
* NP405H.
*
- * We call MAL 2 the version in 440GP, 440GX, 440SP, 440SPE and Axon
+ * We call MAL 2 the version in 440GP, 440GX, 440SPE and Axon
*
* The driver expects a "version" property in the emac node containing
* a number 1 or 2. New device-trees for EMAC capable platforms are thus
--
2.55.0