ARM: rmobile: Convert PRR to DM and OF control

Implement DM driver for the Renesas PRR into RCar cpu info and convert
all users with DM and OF enabled to this new driver. This means all of
the boards with DM and OF enabled can fetch PRR address from DT, which
is useful on ie. V3M which has different PRR address than the rest of
Gen3 SoCs.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

diff --git a/arch/arm/mach-rmobile/cpu_info-rcar.c b/arch/arm/mach-rmobile/cpu_info-rcar.c
index c373eef73d46244b6f8ecb2898af809f4a1e457d..b443611cbb33181530ca3ff4aa86f5730c0ba0bd 100644 (file)
--- a/arch/arm/mach-rmobile/cpu_info-rcar.c
+++ b/arch/arm/mach-rmobile/cpu_info-rcar.c
@@ -8,19 +8,20 @@
 #include <common.h>
 #include <asm/io.h>
 
-#define PRR                    0xFF000044
 #define PRR_MASK               0x7fff
 #define R8A7796_REV_1_0                0x5200
 #define R8A7796_REV_1_1                0x5210
 
+static u32 rmobile_get_prr(void);
+
 u32 rmobile_get_cpu_type(void)
 {
-       return (readl(PRR) & 0x00007F00) >> 8;
+       return (rmobile_get_prr() & 0x00007F00) >> 8;
 }
 
 u32 rmobile_get_cpu_rev_integer(void)
 {
-       const u32 prr = readl(PRR);
+       const u32 prr = rmobile_get_prr();
 
        if ((prr & PRR_MASK) == R8A7796_REV_1_1)
                return 1;
@@ -30,10 +31,62 @@ u32 rmobile_get_cpu_rev_integer(void)
 
 u32 rmobile_get_cpu_rev_fraction(void)
 {
-       const u32 prr = readl(PRR);
+       const u32 prr = rmobile_get_prr();
 
        if ((prr & PRR_MASK) == R8A7796_REV_1_1)
                return 1;
        else
                return prr & 0x0000000F;
 }
+
+#if !CONFIG_IS_ENABLED(DM) || !CONFIG_IS_ENABLED(SYSCON)
+static u32 rmobile_get_prr(void)
+{
+       /*
+        * On RCar/RMobile Gen2 and older systems, the PRR is always
+        * located at the address below. On newer systems, the PRR
+        * may be located at different address, but that information
+        * is obtained from DT. This code will be removed when all
+        * of the older systems get converted to DM and OF control.
+        */
+       return readl(0xFF000044);
+}
+#else
+
+#include <dm.h>
+#include <syscon.h>
+#include <regmap.h>
+
+struct renesas_prr_priv {
+       fdt_addr_t      regs;
+};
+
+enum {
+       PRR_RCAR,
+};
+
+static u32 rmobile_get_prr(void)
+{
+       struct regmap *map;
+
+       map = syscon_get_regmap_by_driver_data(PRR_RCAR);
+       if (!map) {
+               printf("PRR regmap failed!\n");
+               hang();
+       }
+
+       return readl(map->base);
+}
+
+static const struct udevice_id renesas_prr_ids[] = {
+       { .compatible = "renesas,prr", .data = PRR_RCAR },
+       { }
+};
+
+U_BOOT_DRIVER(renesas_prr) = {
+       .name   = "renesas_prr",
+       .id     = UCLASS_SYSCON,
+       .of_match = renesas_prr_ids,
+       .flags  = DM_FLAG_PRE_RELOC,
+};
+#endif