[PATCH 10/10] aspeed/smc: Introduce an addr_width() class handler

[Cédric Le Goater]

The AST2400 SPI controller has a transitional HW interface and it
stores the address width currently in use in a different register than
all the other SMC controllers. It needs special handling when working
in 4B mode.

Make it clear through a class handler. This also removes another use
of the segments array.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 include/hw/ssi/aspeed_smc.h |  1 +
 hw/ssi/aspeed_smc.c         | 19 ++++++++++++-------
 2 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/include/hw/ssi/aspeed_smc.h b/include/hw/ssi/aspeed_smc.h
index a1ca0e65c405..8dc81294988e 100644
--- a/include/hw/ssi/aspeed_smc.h
+++ b/include/hw/ssi/aspeed_smc.h
@@ -111,6 +111,7 @@ struct AspeedSMCClass {
     void (*reg_to_segment)(const AspeedSMCState *s, uint32_t reg,
                            AspeedSegments *seg);
     void (*dma_ctrl)(AspeedSMCState *s, uint32_t value);
+    int (*addr_width)(const AspeedSMCState *s);
 };
 
 #endif /* ASPEED_SMC_H */
diff --git a/hw/ssi/aspeed_smc.c b/hw/ssi/aspeed_smc.c
index 59b62987db21..da4222b96dc4 100644
--- a/hw/ssi/aspeed_smc.c
+++ b/hw/ssi/aspeed_smc.c
@@ -196,7 +196,6 @@
  * controller. These can be changed when board is initialized with the
  * Segment Address Registers.
  */
-static const AspeedSegments aspeed_2400_spi1_segments[];
 static const AspeedSegments aspeed_2500_spi1_segments[];
 static const AspeedSegments aspeed_2500_spi2_segments[];
 
@@ -382,15 +381,15 @@ static inline int aspeed_smc_flash_cmd(const 
AspeedSMCFlash *fl)
     return cmd;
 }
 
-static inline int aspeed_smc_flash_is_4byte(const AspeedSMCFlash *fl)
+static inline int aspeed_smc_flash_addr_width(const AspeedSMCFlash *fl)
 {
     const AspeedSMCState *s = fl->controller;
     AspeedSMCClass *asc = ASPEED_SMC_GET_CLASS(s);
 
-    if (asc->segments == aspeed_2400_spi1_segments) {
-        return s->regs[s->r_ctrl0] & CTRL_AST2400_SPI_4BYTE;
+    if (asc->addr_width) {
+        return asc->addr_width(s);
     } else {
-        return s->regs[s->r_ce_ctrl] & (1 << (CTRL_EXTENDED0 + fl->cs));
+        return s->regs[s->r_ce_ctrl] & (1 << (CTRL_EXTENDED0 + fl->cs)) ? 4 : 
3;
     }
 }
 
@@ -450,7 +449,7 @@ static void aspeed_smc_flash_setup(AspeedSMCFlash *fl, 
uint32_t addr)
 {
     const AspeedSMCState *s = fl->controller;
     uint8_t cmd = aspeed_smc_flash_cmd(fl);
-    int i = aspeed_smc_flash_is_4byte(fl) ? 4 : 3;
+    int i = aspeed_smc_flash_addr_width(fl);
 
     /* Flash access can not exceed CS segment */
     addr = aspeed_smc_check_segment_addr(fl, addr);
@@ -558,7 +557,7 @@ static bool aspeed_smc_do_snoop(AspeedSMCFlash *fl,  
uint64_t data,
                                 unsigned size)
 {
     AspeedSMCState *s = fl->controller;
-    uint8_t addr_width = aspeed_smc_flash_is_4byte(fl) ? 4 : 3;
+    uint8_t addr_width = aspeed_smc_flash_addr_width(fl);
 
     trace_aspeed_smc_do_snoop(fl->cs, s->snoop_index, s->snoop_dummies,
                               (uint8_t) data & 0xff);
@@ -1386,6 +1385,11 @@ static const AspeedSegments aspeed_2400_spi1_segments[] 
= {
     { 0x30000000, 64 * MiB },
 };
 
+static int aspeed_2400_spi1_addr_width(const AspeedSMCState *s)
+{
+    return s->regs[R_SPI_CTRL0] & CTRL_AST2400_SPI_4BYTE ? 4 : 3;
+}
+
 static void aspeed_2400_spi1_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
@@ -1407,6 +1411,7 @@ static void aspeed_2400_spi1_class_init(ObjectClass 
*klass, void *data)
     asc->segment_to_reg    = aspeed_smc_segment_to_reg;
     asc->reg_to_segment    = aspeed_smc_reg_to_segment;
     asc->dma_ctrl          = aspeed_smc_dma_ctrl;
+    asc->addr_width        = aspeed_2400_spi1_addr_width;
 }
 
 static const TypeInfo aspeed_2400_spi1_info = {
-- 
2.31.1