sunxi: SPL SPI: Split off SPI0 base address

So far on all supported Allwinner SoCs we find the old generation SPI
controller always at address 0x1c05000, and the new generation one at
0x1c68000. However the Allwinner R40 SoC has a new generation SPI at
the old address, and the H6 uses a completely different address.

So split off the base address from the respective SPI registers, by
changing the #defines to just contain offsets.
The base address is provided by a function, so it can easily be extended
later when support for those SoCs materialises.

This does not change the code size (since the toolchain is clever enough
to optimise this properly), also does not bring any functional change at
this point.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>

diff --git a/arch/arm/mach-sunxi/spl_spi_sunxi.c b/arch/arm/mach-sunxi/spl_spi_sunxi.c
index 043d9f6eade33ac00d7165e63df1ed6cfd8e2f8f..5b4598a25b38a7aac99b01b53d5a49fcaf880cab 100644 (file)
--- a/arch/arm/mach-sunxi/spl_spi_sunxi.c
+++ b/arch/arm/mach-sunxi/spl_spi_sunxi.c
@@ -36,13 +36,13 @@
 /* SUN4I variant of the SPI controller                                       */
 /*****************************************************************************/
 
-#define SUN4I_SPI0_CCTL             (0x01C05000 + 0x1C)
-#define SUN4I_SPI0_CTL              (0x01C05000 + 0x08)
-#define SUN4I_SPI0_RX               (0x01C05000 + 0x00)
-#define SUN4I_SPI0_TX               (0x01C05000 + 0x04)
-#define SUN4I_SPI0_FIFO_STA         (0x01C05000 + 0x28)
-#define SUN4I_SPI0_BC               (0x01C05000 + 0x20)
-#define SUN4I_SPI0_TC               (0x01C05000 + 0x24)
+#define SUN4I_SPI0_CCTL             0x1C
+#define SUN4I_SPI0_CTL              0x08
+#define SUN4I_SPI0_RX               0x00
+#define SUN4I_SPI0_TX               0x04
+#define SUN4I_SPI0_FIFO_STA         0x28
+#define SUN4I_SPI0_BC               0x20
+#define SUN4I_SPI0_TC               0x24
 
 #define SUN4I_CTL_ENABLE            BIT(0)
 #define SUN4I_CTL_MASTER            BIT(1)
@@ -54,15 +54,15 @@
 /* SUN6I variant of the SPI controller                                       */
 /*****************************************************************************/
 
-#define SUN6I_SPI0_CCTL             (0x01C68000 + 0x24)
-#define SUN6I_SPI0_GCR              (0x01C68000 + 0x04)
-#define SUN6I_SPI0_TCR              (0x01C68000 + 0x08)
-#define SUN6I_SPI0_FIFO_STA         (0x01C68000 + 0x1C)
-#define SUN6I_SPI0_MBC              (0x01C68000 + 0x30)
-#define SUN6I_SPI0_MTC              (0x01C68000 + 0x34)
-#define SUN6I_SPI0_BCC              (0x01C68000 + 0x38)
-#define SUN6I_SPI0_TXD              (0x01C68000 + 0x200)
-#define SUN6I_SPI0_RXD              (0x01C68000 + 0x300)
+#define SUN6I_SPI0_CCTL             0x24
+#define SUN6I_SPI0_GCR              0x04
+#define SUN6I_SPI0_TCR              0x08
+#define SUN6I_SPI0_FIFO_STA         0x1C
+#define SUN6I_SPI0_MBC              0x30
+#define SUN6I_SPI0_MTC              0x34
+#define SUN6I_SPI0_BCC              0x38
+#define SUN6I_SPI0_TXD              0x200
+#define SUN6I_SPI0_RXD              0x300
 
 #define SUN6I_CTL_ENABLE            BIT(0)
 #define SUN6I_CTL_MASTER            BIT(1)
@@ -100,11 +100,21 @@ static void spi0_pinmux_setup(unsigned int pin_function)
                sunxi_gpio_set_cfgpin(SUNXI_GPC(3), pin_function);
 }
 
+static uintptr_t spi0_base_address(void)
+{
+       if (!IS_ENABLED(CONFIG_SUNXI_GEN_SUN6I))
+               return 0x01C05000;
+
+       return 0x01C68000;
+}
+
 /*
  * Setup 6 MHz from OSC24M (because the BROM is doing the same).
  */
 static void spi0_enable_clock(void)
 {
+       uintptr_t base = spi0_base_address();
+
        /* Deassert SPI0 reset on SUN6I */
        if (IS_ENABLED(CONFIG_SUNXI_GEN_SUN6I))
                setbits_le32(SUN6I_BUS_SOFT_RST_REG0,
@@ -114,36 +124,37 @@ static void spi0_enable_clock(void)
        setbits_le32(CCM_AHB_GATING0, (1 << AHB_GATE_OFFSET_SPI0));
 
        /* Divide by 4 */
-       writel(SPI0_CLK_DIV_BY_4, IS_ENABLED(CONFIG_SUNXI_GEN_SUN6I) ?
-                                 SUN6I_SPI0_CCTL : SUN4I_SPI0_CCTL);
+       writel(SPI0_CLK_DIV_BY_4, base + (IS_ENABLED(CONFIG_SUNXI_GEN_SUN6I) ?
+                                 SUN6I_SPI0_CCTL : SUN4I_SPI0_CCTL));
        /* 24MHz from OSC24M */
        writel((1 << 31), CCM_SPI0_CLK);
 
        if (IS_ENABLED(CONFIG_SUNXI_GEN_SUN6I)) {
                /* Enable SPI in the master mode and do a soft reset */
-               setbits_le32(SUN6I_SPI0_GCR, SUN6I_CTL_MASTER |
-                                            SUN6I_CTL_ENABLE |
-                                            SUN6I_CTL_SRST);
+               setbits_le32(base + SUN6I_SPI0_GCR, SUN6I_CTL_MASTER |
+                            SUN6I_CTL_ENABLE | SUN6I_CTL_SRST);
                /* Wait for completion */
-               while (readl(SUN6I_SPI0_GCR) & SUN6I_CTL_SRST)
+               while (readl(base + SUN6I_SPI0_GCR) & SUN6I_CTL_SRST)
                        ;
        } else {
                /* Enable SPI in the master mode and reset FIFO */
-               setbits_le32(SUN4I_SPI0_CTL, SUN4I_CTL_MASTER |
-                                            SUN4I_CTL_ENABLE |
-                                            SUN4I_CTL_TF_RST |
-                                            SUN4I_CTL_RF_RST);
+               setbits_le32(base + SUN4I_SPI0_CTL, SUN4I_CTL_MASTER |
+                                                   SUN4I_CTL_ENABLE |
+                                                   SUN4I_CTL_TF_RST |
+                                                   SUN4I_CTL_RF_RST);
        }
 }
 
 static void spi0_disable_clock(void)
 {
+       uintptr_t base = spi0_base_address();
+
        /* Disable the SPI0 controller */
        if (IS_ENABLED(CONFIG_SUNXI_GEN_SUN6I))
-               clrbits_le32(SUN6I_SPI0_GCR, SUN6I_CTL_MASTER |
+               clrbits_le32(base + SUN6I_SPI0_GCR, SUN6I_CTL_MASTER |
                                             SUN6I_CTL_ENABLE);
        else
-               clrbits_le32(SUN4I_SPI0_CTL, SUN4I_CTL_MASTER |
+               clrbits_le32(base + SUN4I_SPI0_CTL, SUN4I_CTL_MASTER |
                                             SUN4I_CTL_ENABLE);
 
        /* Disable the SPI0 clock */
@@ -227,6 +238,7 @@ static void spi0_read_data(void *buf, u32 addr, u32 len)
 {
        u8 *buf8 = buf;
        u32 chunk_len;
+       uintptr_t base = spi0_base_address();
 
        while (len > 0) {
                chunk_len = len;
@@ -235,23 +247,23 @@ static void spi0_read_data(void *buf, u32 addr, u32 len)
 
                if (IS_ENABLED(CONFIG_SUNXI_GEN_SUN6I)) {
                        sunxi_spi0_read_data(buf8, addr, chunk_len,
-                                            SUN6I_SPI0_TCR,
+                                            base + SUN6I_SPI0_TCR,
                                             SUN6I_TCR_XCH,
-                                            SUN6I_SPI0_FIFO_STA,
-                                            SUN6I_SPI0_TXD,
-                                            SUN6I_SPI0_RXD,
-                                            SUN6I_SPI0_MBC,
-                                            SUN6I_SPI0_MTC,
-                                            SUN6I_SPI0_BCC);
+                                            base + SUN6I_SPI0_FIFO_STA,
+                                            base + SUN6I_SPI0_TXD,
+                                            base + SUN6I_SPI0_RXD,
+                                            base + SUN6I_SPI0_MBC,
+                                            base + SUN6I_SPI0_MTC,
+                                            base + SUN6I_SPI0_BCC);
                } else {
                        sunxi_spi0_read_data(buf8, addr, chunk_len,
-                                            SUN4I_SPI0_CTL,
+                                            base + SUN4I_SPI0_CTL,
                                             SUN4I_CTL_XCH,
-                                            SUN4I_SPI0_FIFO_STA,
-                                            SUN4I_SPI0_TX,
-                                            SUN4I_SPI0_RX,
-                                            SUN4I_SPI0_BC,
-                                            SUN4I_SPI0_TC,
+                                            base + SUN4I_SPI0_FIFO_STA,
+                                            base + SUN4I_SPI0_TX,
+                                            base + SUN4I_SPI0_RX,
+                                            base + SUN4I_SPI0_BC,
+                                            base + SUN4I_SPI0_TC,
                                             0);
                }