Merge branch 'master' of https://gitlab.denx.de/u-boot/custodians/u-boot-spi

[oweals/u-boot.git] / drivers / serial / serial_uniphier.c

diff --git a/drivers/serial/serial_uniphier.c b/drivers/serial/serial_uniphier.c
index a6bd27facffd91f7356f89077df1ad9a6ecbf95c..c7f46e5598116db68188eb7a925f87786db913bb 100644 (file)
--- a/drivers/serial/serial_uniphier.c
+++ b/drivers/serial/serial_uniphier.c
@@ -1,15 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2012-2015 Panasonic Corporation
- *   Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
- *
- * SPDX-License-Identifier:    GPL-2.0+
+ * Copyright (C) 2015-2016 Socionext Inc.
+ *   Author: Masahiro Yamada <yamada.masahiro@socionext.com>
  */
 
+#include <common.h>
+#include <dm.h>
+#include <linux/bug.h>
+#include <linux/io.h>
 #include <linux/serial_reg.h>
-#include <asm/io.h>
-#include <asm/errno.h>
-#include <dm/device.h>
-#include <dm/platform_data/serial-uniphier.h>
+#include <linux/sizes.h>
+#include <linux/errno.h>
 #include <serial.h>
 #include <fdtdec.h>
 
@@ -32,21 +34,22 @@ struct uniphier_serial {
        u32 dlr;                /* Divisor Latch Register */
 };
 
-struct uniphier_serial_private_data {
+struct uniphier_serial_priv {
        struct uniphier_serial __iomem *membase;
+       unsigned int uartclk;
 };
 
 #define uniphier_serial_port(dev)      \
-       ((struct uniphier_serial_private_data *)dev_get_priv(dev))->membase
+       ((struct uniphier_serial_priv *)dev_get_priv(dev))->membase
 
 static int uniphier_serial_setbrg(struct udevice *dev, int baudrate)
 {
-       struct uniphier_serial_platform_data *plat = dev_get_platdata(dev);
+       struct uniphier_serial_priv *priv = dev_get_priv(dev);
        struct uniphier_serial __iomem *port = uniphier_serial_port(dev);
        const unsigned int mode_x_div = 16;
        unsigned int divisor;
 
-       divisor = DIV_ROUND_CLOSEST(plat->uartclk, mode_x_div * baudrate);
+       divisor = DIV_ROUND_CLOSEST(priv->uartclk, mode_x_div * baudrate);
 
        writel(divisor, &port->dlr);
 
@@ -85,19 +88,61 @@ static int uniphier_serial_pending(struct udevice *dev, bool input)
                return !(readl(&port->lsr) & UART_LSR_THRE);
 }
 
+/*
+ * SPL does not have enough memory footprint for the clock driver.
+ * Hardcode clock frequency for each SoC.
+ */
+struct uniphier_serial_clk_data {
+       const char *compatible;
+       unsigned int clk_rate;
+};
+
+static const struct uniphier_serial_clk_data uniphier_serial_clk_data[] = {
+       { .compatible = "socionext,uniphier-ld4",  .clk_rate = 36864000 },
+       { .compatible = "socionext,uniphier-pro4", .clk_rate = 73728000 },
+       { .compatible = "socionext,uniphier-sld8", .clk_rate = 80000000 },
+       { .compatible = "socionext,uniphier-pro5", .clk_rate = 73728000 },
+       { .compatible = "socionext,uniphier-pxs2", .clk_rate = 88888888 },
+       { .compatible = "socionext,uniphier-ld6b", .clk_rate = 88888888 },
+       { .compatible = "socionext,uniphier-ld11", .clk_rate = 58823529 },
+       { .compatible = "socionext,uniphier-ld20", .clk_rate = 58823529 },
+       { .compatible = "socionext,uniphier-pxs3", .clk_rate = 58823529 },
+       { /* sentinel */ },
+};
+
 static int uniphier_serial_probe(struct udevice *dev)
 {
-       u32 tmp;
-       struct uniphier_serial_private_data *priv = dev_get_priv(dev);
-       struct uniphier_serial_platform_data *plat = dev_get_platdata(dev);
+       struct uniphier_serial_priv *priv = dev_get_priv(dev);
        struct uniphier_serial __iomem *port;
+       const struct uniphier_serial_clk_data *clk_data;
+       ofnode root_node;
+       fdt_addr_t base;
+       u32 tmp;
+
+       base = devfdt_get_addr(dev);
+       if (base == FDT_ADDR_T_NONE)
+               return -EINVAL;
 
-       port = map_sysmem(plat->base, sizeof(struct uniphier_serial));
+       port = devm_ioremap(dev, base, SZ_64);
        if (!port)
                return -ENOMEM;
 
        priv->membase = port;
 
+       root_node = ofnode_path("/");
+       clk_data = uniphier_serial_clk_data;
+       while (clk_data->compatible) {
+               if (ofnode_device_is_compatible(root_node,
+                                               clk_data->compatible))
+                       break;
+               clk_data++;
+       }
+
+       if (WARN_ON(!clk_data->compatible))
+               return -ENOTSUPP;
+
+       priv->uartclk = clk_data->clk_rate;
+
        tmp = readl(&port->lcr_mcr);
        tmp &= ~LCR_MASK;
        tmp |= UART_LCR_WLEN8 << LCR_SHIFT;
@@ -106,32 +151,11 @@ static int uniphier_serial_probe(struct udevice *dev)
        return 0;
 }
 
-static int uniphier_serial_remove(struct udevice *dev)
-{
-       unmap_sysmem(uniphier_serial_port(dev));
-
-       return 0;
-}
-
-#ifdef CONFIG_OF_CONTROL
 static const struct udevice_id uniphier_uart_of_match[] = {
-       { .compatible = "panasonic,uniphier-uart" },
-       {},
+       { .compatible = "socionext,uniphier-uart" },
+       { /* sentinel */ }
 };
 
-static int uniphier_serial_ofdata_to_platdata(struct udevice *dev)
-{
-       struct uniphier_serial_platform_data *plat = dev_get_platdata(dev);
-       DECLARE_GLOBAL_DATA_PTR;
-
-       plat->base = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
-       plat->uartclk = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
-                                      "clock-frequency", 0);
-
-       return 0;
-}
-#endif
-
 static const struct dm_serial_ops uniphier_serial_ops = {
        .setbrg = uniphier_serial_setbrg,
        .getc = uniphier_serial_getc,
@@ -140,15 +164,10 @@ static const struct dm_serial_ops uniphier_serial_ops = {
 };
 
 U_BOOT_DRIVER(uniphier_serial) = {
-       .name = DRIVER_NAME,
+       .name = "uniphier-uart",
        .id = UCLASS_SERIAL,
-       .of_match = of_match_ptr(uniphier_uart_of_match),
-       .ofdata_to_platdata = of_match_ptr(uniphier_serial_ofdata_to_platdata),
+       .of_match = uniphier_uart_of_match,
        .probe = uniphier_serial_probe,
-       .remove = uniphier_serial_remove,
-       .priv_auto_alloc_size = sizeof(struct uniphier_serial_private_data),
-       .platdata_auto_alloc_size =
-                               sizeof(struct uniphier_serial_platform_data),
+       .priv_auto_alloc_size = sizeof(struct uniphier_serial_priv),
        .ops = &uniphier_serial_ops,
-       .flags = DM_FLAG_PRE_RELOC,
 };