drivers/clk/sunxi-ng/ccu-sun9i-a80-usb.c

   1 /*
   2  * Copyright (c) 2016 Chen-Yu Tsai. All rights reserved.
   3  *
   4  * This software is licensed under the terms of the GNU General Public
   5  * License version 2, as published by the Free Software Foundation, and
   6  * may be copied, distributed, and modified under those terms.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <linux/clk.h>
  15 #include <linux/clk-provider.h>
  16 #include <linux/of_address.h>
  17 #include <linux/platform_device.h>
  18
  19 #include "ccu_common.h"
  20 #include "ccu_gate.h"
  21 #include "ccu_reset.h"
  22
  23 #include "ccu-sun9i-a80-usb.h"
  24
  25 static SUNXI_CCU_GATE(bus_hci0_clk, "bus-hci0", "bus-usb", 0x0, BIT(1), 0);
  26 static SUNXI_CCU_GATE(usb_ohci0_clk, "usb-ohci0", "osc24M", 0x0, BIT(2), 0);
  27 static SUNXI_CCU_GATE(bus_hci1_clk, "bus-hci1", "bus-usb", 0x0, BIT(3), 0);
  28 static SUNXI_CCU_GATE(bus_hci2_clk, "bus-hci2", "bus-usb", 0x0, BIT(5), 0);
  29 static SUNXI_CCU_GATE(usb_ohci2_clk, "usb-ohci2", "osc24M", 0x0, BIT(6), 0);
  30
  31 static SUNXI_CCU_GATE(usb0_phy_clk, "usb0-phy", "osc24M", 0x4, BIT(1), 0);
  32 static SUNXI_CCU_GATE(usb1_hsic_clk, "usb1-hsic", "osc24M", 0x4, BIT(2), 0);
  33 static SUNXI_CCU_GATE(usb1_phy_clk, "usb1-phy", "osc24M", 0x4, BIT(3), 0);
  34 static SUNXI_CCU_GATE(usb2_hsic_clk, "usb2-hsic", "osc24M", 0x4, BIT(4), 0);
  35 static SUNXI_CCU_GATE(usb2_phy_clk, "usb2-phy", "osc24M", 0x4, BIT(5), 0);
  36 static SUNXI_CCU_GATE(usb_hsic_clk, "usb-hsic", "osc24M", 0x4, BIT(10), 0);
  37
  38 static struct ccu_common *sun9i_a80_usb_clks[] = {
  39         &bus_hci0_clk.common,
  40         &usb_ohci0_clk.common,
  41         &bus_hci1_clk.common,
  42         &bus_hci2_clk.common,
  43         &usb_ohci2_clk.common,
  44
  45         &usb0_phy_clk.common,
  46         &usb1_hsic_clk.common,
  47         &usb1_phy_clk.common,
  48         &usb2_hsic_clk.common,
  49         &usb2_phy_clk.common,
  50         &usb_hsic_clk.common,
  51 };
  52
  53 static struct clk_hw_onecell_data sun9i_a80_usb_hw_clks = {
  54         .hws    = {
  55                 [CLK_BUS_HCI0]  = &bus_hci0_clk.common.hw,
  56                 [CLK_USB_OHCI0] = &usb_ohci0_clk.common.hw,
  57                 [CLK_BUS_HCI1]  = &bus_hci1_clk.common.hw,
  58                 [CLK_BUS_HCI2]  = &bus_hci2_clk.common.hw,
  59                 [CLK_USB_OHCI2] = &usb_ohci2_clk.common.hw,
  60
  61                 [CLK_USB0_PHY]  = &usb0_phy_clk.common.hw,
  62                 [CLK_USB1_HSIC] = &usb1_hsic_clk.common.hw,
  63                 [CLK_USB1_PHY]  = &usb1_phy_clk.common.hw,
  64                 [CLK_USB2_HSIC] = &usb2_hsic_clk.common.hw,
  65                 [CLK_USB2_PHY]  = &usb2_phy_clk.common.hw,
  66                 [CLK_USB_HSIC]  = &usb_hsic_clk.common.hw,
  67         },
  68         .num    = CLK_NUMBER,
  69 };
  70
  71 static struct ccu_reset_map sun9i_a80_usb_resets[] = {
  72         [RST_USB0_HCI]          = { 0x0, BIT(17) },
  73         [RST_USB1_HCI]          = { 0x0, BIT(18) },
  74         [RST_USB2_HCI]          = { 0x0, BIT(19) },
  75
  76         [RST_USB0_PHY]          = { 0x4, BIT(17) },
  77         [RST_USB1_HSIC]         = { 0x4, BIT(18) },
  78         [RST_USB1_PHY]          = { 0x4, BIT(19) },
  79         [RST_USB2_HSIC]         = { 0x4, BIT(20) },
  80         [RST_USB2_PHY]          = { 0x4, BIT(21) },
  81 };
  82
  83 static const struct sunxi_ccu_desc sun9i_a80_usb_clk_desc = {
  84         .ccu_clks       = sun9i_a80_usb_clks,
  85         .num_ccu_clks   = ARRAY_SIZE(sun9i_a80_usb_clks),
  86
  87         .hw_clks        = &sun9i_a80_usb_hw_clks,
  88
  89         .resets         = sun9i_a80_usb_resets,
  90         .num_resets     = ARRAY_SIZE(sun9i_a80_usb_resets),
  91 };
  92
  93 static int sun9i_a80_usb_clk_probe(struct platform_device *pdev)
  94 {
  95         struct resource *res;
  96         struct clk *bus_clk;
  97         void __iomem *reg;
  98         int ret;
  99
 100         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 101         reg = devm_ioremap_resource(&pdev->dev, res);
 102         if (IS_ERR(reg))
 103                 return PTR_ERR(reg);
 104
 105         bus_clk = devm_clk_get(&pdev->dev, "bus");
 106         if (IS_ERR(bus_clk)) {
 107                 ret = PTR_ERR(bus_clk);
 108                 if (ret != -EPROBE_DEFER)
 109                         dev_err(&pdev->dev, "Couldn't get bus clk: %d\n", ret);
 110                 return ret;
 111         }
 112
 113         /* The bus clock needs to be enabled for us to access the registers */
 114         ret = clk_prepare_enable(bus_clk);
 115         if (ret) {
 116                 dev_err(&pdev->dev, "Couldn't enable bus clk: %d\n", ret);
 117                 return ret;
 118         }
 119
 120         ret = sunxi_ccu_probe(pdev->dev.of_node, reg,
 121                               &sun9i_a80_usb_clk_desc);
 122         if (ret)
 123                 goto err_disable_clk;
 124
 125         return 0;
 126
 127 err_disable_clk:
 128         clk_disable_unprepare(bus_clk);
 129         return ret;
 130 }
 131
 132 static const struct of_device_id sun9i_a80_usb_clk_ids[] = {
 133         { .compatible = "allwinner,sun9i-a80-usb-clks" },
 134         { }
 135 };
 136
 137 static struct platform_driver sun9i_a80_usb_clk_driver = {
 138         .probe  = sun9i_a80_usb_clk_probe,
 139         .driver = {
 140                 .name   = "sun9i-a80-usb-clks",
 141                 .of_match_table = sun9i_a80_usb_clk_ids,
 142         },
 143 };
 144 builtin_platform_driver(sun9i_a80_usb_clk_driver);