board: sifive: unmatched: refine GEMGXL initialized function in SPL

Create a new function spl_reset_device_by_gpio to reset the device
whose reset pin is connected to the GPIO. Then, using this function
to initialize GEMGXL.

Signed-off-by: Vincent Chen <vincent.chen@sifive.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>

diff --git a/board/sifive/unmatched/spl.c b/board/sifive/unmatched/spl.c
index 5e1333b..b598f9f 100644 (file)
--- a/board/sifive/unmatched/spl.c
+++ b/board/sifive/unmatched/spl.c
@@ -22,43 +22,63 @@
 #define MODE_SELECT_SD         0xb
 #define MODE_SELECT_MASK       GENMASK(3, 0)
 
-int spl_board_init_f(void)
+static inline int spl_reset_device_by_gpio(const char *label, int pin, int low_width)
 {
        int ret;
 
-       ret = spl_soc_init();
+       ret = gpio_request(pin, label);
        if (ret) {
-               debug("HiFive Unmatched FU740 SPL init failed: %d\n", ret);
+               debug("%s gpio request failed: %d\n", label, ret);
+               return ret;
+       }
+
+       ret = gpio_direction_output(pin, 1);
+       if (ret) {
+               debug("%s gpio direction set failed: %d\n", label, ret);
                return ret;
        }
 
+       udelay(1);
+
+       gpio_set_value(pin, 0);
+       udelay(low_width);
+       gpio_set_value(pin, 1);
+
+       return ret;
+}
+
+static inline int spl_gemgxl_init(void)
+{
+       int ret;
        /*
         * GEMGXL init VSC8541 PHY reset sequence;
         * leave pull-down active for 2ms
         */
        udelay(2000);
-       ret = gpio_request(GEM_PHY_RESET, "gem_phy_reset");
+       ret = spl_reset_device_by_gpio("gem_phy_reset", GEM_PHY_RESET, 1);
+       mdelay(15);
+
+       return ret;
+}
+
+int spl_board_init_f(void)
+{
+       int ret;
+
+       ret = spl_soc_init();
        if (ret) {
-               debug("gem_phy_reset gpio request failed: %d\n", ret);
-               return ret;
+               debug("HiFive Unmatched FU740 SPL init failed: %d\n", ret);
+               goto end;
        }
 
-       /* Set GPIO 12 (PHY NRESET) */
-       ret = gpio_direction_output(GEM_PHY_RESET, 1);
+       ret = spl_gemgxl_init();
        if (ret) {
-               debug("gem_phy_reset gpio direction set failed: %d\n", ret);
-               return ret;
+               debug("Gigabit ethernet PHY (VSC8541) init failed: %d\n", ret);
+               goto end;
        }
 
-       udelay(1);
-
-       /* Reset PHY again to enter unmanaged mode */
-       gpio_set_value(GEM_PHY_RESET, 0);
-       udelay(1);
-       gpio_set_value(GEM_PHY_RESET, 1);
-       mdelay(15);
-
-       return 0;
+end:
+       return ret;
 }
 
 u32 spl_boot_device(void)