clk: aspeed: Add platform driver and register PLLs

This registers a platform driver to set up all of the non-core clocks.

The clocks that have configurable rates are now registered.

Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

diff --git a/drivers/clk/clk-aspeed.c b/drivers/clk/clk-aspeed.c
index 5adedda82d26d0a246a83aeb27cec11d3864d6df..cf5ea63feb31309ca735ec817e8236a9fc9529ca 100644 (file)
--- a/drivers/clk/clk-aspeed.c
+++ b/drivers/clk/clk-aspeed.c
@@ -5,6 +5,8 @@
 #include <linux/clk-provider.h>
 #include <linux/mfd/syscon.h>
 #include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
@@ -107,6 +109,18 @@ static const struct aspeed_gate_data aspeed_gates[] = {
        [ASPEED_CLK_GATE_LHCCLK] =      { 28, -1, "lhclk-gate",         "lhclk", 0 }, /* LPC master/LPC+ */
 };
 
+static const struct clk_div_table ast2500_mac_div_table[] = {
+       { 0x0, 4 }, /* Yep, really. Aspeed confirmed this is correct */
+       { 0x1, 4 },
+       { 0x2, 6 },
+       { 0x3, 8 },
+       { 0x4, 10 },
+       { 0x5, 12 },
+       { 0x6, 14 },
+       { 0x7, 16 },
+       { 0 }
+};
+
 static const struct clk_div_table ast2400_div_table[] = {
        { 0x0, 2 },
        { 0x1, 4 },
@@ -172,6 +186,122 @@ static struct clk_hw *aspeed_ast2500_calc_pll(const char *name, u32 val)
                        mult, div);
 }
 
+struct aspeed_clk_soc_data {
+       const struct clk_div_table *div_table;
+       const struct clk_div_table *mac_div_table;
+       struct clk_hw *(*calc_pll)(const char *name, u32 val);
+};
+
+static const struct aspeed_clk_soc_data ast2500_data = {
+       .div_table = ast2500_div_table,
+       .mac_div_table = ast2500_mac_div_table,
+       .calc_pll = aspeed_ast2500_calc_pll,
+};
+
+static const struct aspeed_clk_soc_data ast2400_data = {
+       .div_table = ast2400_div_table,
+       .mac_div_table = ast2400_div_table,
+       .calc_pll = aspeed_ast2400_calc_pll,
+};
+
+static int aspeed_clk_probe(struct platform_device *pdev)
+{
+       const struct aspeed_clk_soc_data *soc_data;
+       struct device *dev = &pdev->dev;
+       struct regmap *map;
+       struct clk_hw *hw;
+       u32 val, rate;
+
+       map = syscon_node_to_regmap(dev->of_node);
+       if (IS_ERR(map)) {
+               dev_err(dev, "no syscon regmap\n");
+               return PTR_ERR(map);
+       }
+
+       /* SoC generations share common layouts but have different divisors */
+       soc_data = of_device_get_match_data(dev);
+       if (!soc_data) {
+               dev_err(dev, "no match data for platform\n");
+               return -EINVAL;
+       }
+
+       /* UART clock div13 setting */
+       regmap_read(map, ASPEED_MISC_CTRL, &val);
+       if (val & UART_DIV13_EN)
+               rate = 24000000 / 13;
+       else
+               rate = 24000000;
+       /* TODO: Find the parent data for the uart clock */
+       hw = clk_hw_register_fixed_rate(dev, "uart", NULL, 0, rate);
+       if (IS_ERR(hw))
+               return PTR_ERR(hw);
+       aspeed_clk_data->hws[ASPEED_CLK_UART] = hw;
+
+       /*
+        * Memory controller (M-PLL) PLL. This clock is configured by the
+        * bootloader, and is exposed to Linux as a read-only clock rate.
+        */
+       regmap_read(map, ASPEED_MPLL_PARAM, &val);
+       hw = soc_data->calc_pll("mpll", val);
+       if (IS_ERR(hw))
+               return PTR_ERR(hw);
+       aspeed_clk_data->hws[ASPEED_CLK_MPLL] = hw;
+
+       /* SD/SDIO clock divider (TODO: There's a gate too) */
+       hw = clk_hw_register_divider_table(dev, "sdio", "hpll", 0,
+                       scu_base + ASPEED_CLK_SELECTION, 12, 3, 0,
+                       soc_data->div_table,
+                       &aspeed_clk_lock);
+       if (IS_ERR(hw))
+               return PTR_ERR(hw);
+       aspeed_clk_data->hws[ASPEED_CLK_SDIO] = hw;
+
+       /* MAC AHB bus clock divider */
+       hw = clk_hw_register_divider_table(dev, "mac", "hpll", 0,
+                       scu_base + ASPEED_CLK_SELECTION, 16, 3, 0,
+                       soc_data->mac_div_table,
+                       &aspeed_clk_lock);
+       if (IS_ERR(hw))
+               return PTR_ERR(hw);
+       aspeed_clk_data->hws[ASPEED_CLK_MAC] = hw;
+
+       /* LPC Host (LHCLK) clock divider */
+       hw = clk_hw_register_divider_table(dev, "lhclk", "hpll", 0,
+                       scu_base + ASPEED_CLK_SELECTION, 20, 3, 0,
+                       soc_data->div_table,
+                       &aspeed_clk_lock);
+       if (IS_ERR(hw))
+               return PTR_ERR(hw);
+       aspeed_clk_data->hws[ASPEED_CLK_LHCLK] = hw;
+
+       /* P-Bus (BCLK) clock divider */
+       hw = clk_hw_register_divider_table(dev, "bclk", "hpll", 0,
+                       scu_base + ASPEED_CLK_SELECTION_2, 0, 2, 0,
+                       soc_data->div_table,
+                       &aspeed_clk_lock);
+       if (IS_ERR(hw))
+               return PTR_ERR(hw);
+       aspeed_clk_data->hws[ASPEED_CLK_BCLK] = hw;
+
+       return 0;
+};
+
+static const struct of_device_id aspeed_clk_dt_ids[] = {
+       { .compatible = "aspeed,ast2400-scu", .data = &ast2400_data },
+       { .compatible = "aspeed,ast2500-scu", .data = &ast2500_data },
+       { }
+};
+
+static struct platform_driver aspeed_clk_driver = {
+       .probe  = aspeed_clk_probe,
+       .driver = {
+               .name = "aspeed-clk",
+               .of_match_table = aspeed_clk_dt_ids,
+               .suppress_bind_attrs = true,
+       },
+};
+builtin_platform_driver(aspeed_clk_driver);
+
 static void __init aspeed_ast2400_cc(struct regmap *map)
 {
        struct clk_hw *hw;