diff options
Diffstat (limited to 'drivers/clk/clk-ast2600.c')
| -rw-r--r-- | drivers/clk/clk-ast2600.c | 704 |
1 files changed, 704 insertions, 0 deletions
diff --git a/drivers/clk/clk-ast2600.c b/drivers/clk/clk-ast2600.c new file mode 100644 index 000000000000..1c1bb39bb04e --- /dev/null +++ b/drivers/clk/clk-ast2600.c @@ -0,0 +1,704 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +// Copyright IBM Corp +// Copyright ASPEED Technology + +#define pr_fmt(fmt) "clk-ast2600: " fmt + +#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 <dt-bindings/clock/ast2600-clock.h> + +#include "clk-aspeed.h" + +#define ASPEED_G6_NUM_CLKS 67 + +#define ASPEED_G6_SILICON_REV 0x004 + +#define ASPEED_G6_RESET_CTRL 0x040 +#define ASPEED_G6_RESET_CTRL2 0x050 + +#define ASPEED_G6_CLK_STOP_CTRL 0x080 +#define ASPEED_G6_CLK_STOP_CTRL2 0x090 + +#define ASPEED_G6_MISC_CTRL 0x0C0 +#define UART_DIV13_EN BIT(12) + +#define ASPEED_G6_CLK_SELECTION1 0x300 +#define ASPEED_G6_CLK_SELECTION2 0x304 +#define ASPEED_G6_CLK_SELECTION4 0x310 + +#define ASPEED_HPLL_PARAM 0x200 +#define ASPEED_APLL_PARAM 0x210 +#define ASPEED_MPLL_PARAM 0x220 +#define ASPEED_EPLL_PARAM 0x240 +#define ASPEED_DPLL_PARAM 0x260 + +#define ASPEED_G6_STRAP1 0x500 + +/* Globally visible clocks */ +static DEFINE_SPINLOCK(aspeed_g6_clk_lock); + +/* Keeps track of all clocks */ +static struct clk_hw_onecell_data *aspeed_g6_clk_data; + +static void __iomem *scu_g6_base; + +/* + * Clocks marked with CLK_IS_CRITICAL: + * + * ref0 and ref1 are essential for the SoC to operate + * mpll is required if SDRAM is used + */ +static const struct aspeed_gate_data aspeed_g6_gates[] = { + /* clk rst name parent flags */ + [ASPEED_CLK_GATE_MCLK] = { 0, -1, "mclk-gate", "mpll", CLK_IS_CRITICAL }, /* SDRAM */ + [ASPEED_CLK_GATE_ECLK] = { 1, -1, "eclk-gate", "eclk", 0 }, /* Video Engine */ + [ASPEED_CLK_GATE_GCLK] = { 2, 7, "gclk-gate", NULL, 0 }, /* 2D engine */ + /* vclk parent - dclk/d1clk/hclk/mclk */ + [ASPEED_CLK_GATE_VCLK] = { 3, 6, "vclk-gate", NULL, 0 }, /* Video Capture */ + [ASPEED_CLK_GATE_BCLK] = { 4, 8, "bclk-gate", "bclk", 0 }, /* PCIe/PCI */ + /* From dpll */ + [ASPEED_CLK_GATE_DCLK] = { 5, -1, "dclk-gate", NULL, CLK_IS_CRITICAL }, /* DAC */ + [ASPEED_CLK_GATE_REF0CLK] = { 6, -1, "ref0clk-gate", "clkin", CLK_IS_CRITICAL }, + [ASPEED_CLK_GATE_USBPORT2CLK] = { 7, 3, "usb-port2-gate", NULL, 0 }, /* USB2.0 Host port 2 */ + /* Reserved 8 */ + [ASPEED_CLK_GATE_USBUHCICLK] = { 9, 15, "usb-uhci-gate", NULL, 0 }, /* USB1.1 (requires port 2 enabled) */ + /* From dpll/epll/40mhz usb p1 phy/gpioc6/dp phy pll */ + [ASPEED_CLK_GATE_D1CLK] = { 10, 13, "d1clk-gate", "d1clk", 0 }, /* GFX CRT */ + /* Reserved 11/12 */ + [ASPEED_CLK_GATE_YCLK] = { 13, 4, "yclk-gate", NULL, 0 }, /* HAC */ + [ASPEED_CLK_GATE_USBPORT1CLK] = { 14, 14, "usb-port1-gate", NULL, 0 }, /* USB2 hub/USB2 host port 1/USB1.1 dev */ + [ASPEED_CLK_GATE_UART5CLK] = { 15, -1, "uart5clk-gate", "uart", 0 }, /* UART5 */ + /* Reserved 16/19 */ + [ASPEED_CLK_GATE_MAC1CLK] = { 20, 11, "mac1clk-gate", "mac12", 0 }, /* MAC1 */ + [ASPEED_CLK_GATE_MAC2CLK] = { 21, 12, "mac2clk-gate", "mac12", 0 }, /* MAC2 */ + /* Reserved 22/23 */ + [ASPEED_CLK_GATE_RSACLK] = { 24, 4, "rsaclk-gate", NULL, 0 }, /* HAC */ + [ASPEED_CLK_GATE_RVASCLK] = { 25, 9, "rvasclk-gate", NULL, 0 }, /* RVAS */ + /* Reserved 26 */ + [ASPEED_CLK_GATE_EMMCCLK] = { 27, 16, "emmcclk-gate", NULL, 0 }, /* For card clk */ + /* Reserved 28/29/30 */ + [ASPEED_CLK_GATE_LCLK] = { 32, 32, "lclk-gate", NULL, 0 }, /* LPC */ + [ASPEED_CLK_GATE_ESPICLK] = { 33, -1, "espiclk-gate", NULL, 0 }, /* eSPI */ + [ASPEED_CLK_GATE_REF1CLK] = { 34, -1, "ref1clk-gate", "clkin", CLK_IS_CRITICAL }, + /* Reserved 35 */ + [ASPEED_CLK_GATE_SDCLK] = { 36, 56, "sdclk-gate", NULL, 0 }, /* SDIO/SD */ + [ASPEED_CLK_GATE_LHCCLK] = { 37, -1, "lhclk-gate", "lhclk", 0 }, /* LPC master/LPC+ */ + /* Reserved 38 RSA: no longer used */ + /* Reserved 39 */ + [ASPEED_CLK_GATE_I3C0CLK] = { 40, 40, "i3c0clk-gate", NULL, 0 }, /* I3C0 */ + [ASPEED_CLK_GATE_I3C1CLK] = { 41, 41, "i3c1clk-gate", NULL, 0 }, /* I3C1 */ + [ASPEED_CLK_GATE_I3C2CLK] = { 42, 42, "i3c2clk-gate", NULL, 0 }, /* I3C2 */ + [ASPEED_CLK_GATE_I3C3CLK] = { 43, 43, "i3c3clk-gate", NULL, 0 }, /* I3C3 */ + [ASPEED_CLK_GATE_I3C4CLK] = { 44, 44, "i3c4clk-gate", NULL, 0 }, /* I3C4 */ + [ASPEED_CLK_GATE_I3C5CLK] = { 45, 45, "i3c5clk-gate", NULL, 0 }, /* I3C5 */ + [ASPEED_CLK_GATE_I3C6CLK] = { 46, 46, "i3c6clk-gate", NULL, 0 }, /* I3C6 */ + [ASPEED_CLK_GATE_I3C7CLK] = { 47, 47, "i3c7clk-gate", NULL, 0 }, /* I3C7 */ + [ASPEED_CLK_GATE_UART1CLK] = { 48, -1, "uart1clk-gate", "uart", 0 }, /* UART1 */ + [ASPEED_CLK_GATE_UART2CLK] = { 49, -1, "uart2clk-gate", "uart", 0 }, /* UART2 */ + [ASPEED_CLK_GATE_UART3CLK] = { 50, -1, "uart3clk-gate", "uart", 0 }, /* UART3 */ + [ASPEED_CLK_GATE_UART4CLK] = { 51, -1, "uart4clk-gate", "uart", 0 }, /* UART4 */ + [ASPEED_CLK_GATE_MAC3CLK] = { 52, 52, "mac3clk-gate", "mac34", 0 }, /* MAC3 */ + [ASPEED_CLK_GATE_MAC4CLK] = { 53, 53, "mac4clk-gate", "mac34", 0 }, /* MAC4 */ + [ASPEED_CLK_GATE_UART6CLK] = { 54, -1, "uart6clk-gate", "uartx", 0 }, /* UART6 */ + [ASPEED_CLK_GATE_UART7CLK] = { 55, -1, "uart7clk-gate", "uartx", 0 }, /* UART7 */ + [ASPEED_CLK_GATE_UART8CLK] = { 56, -1, "uart8clk-gate", "uartx", 0 }, /* UART8 */ + [ASPEED_CLK_GATE_UART9CLK] = { 57, -1, "uart9clk-gate", "uartx", 0 }, /* UART9 */ + [ASPEED_CLK_GATE_UART10CLK] = { 58, -1, "uart10clk-gate", "uartx", 0 }, /* UART10 */ + [ASPEED_CLK_GATE_UART11CLK] = { 59, -1, "uart11clk-gate", "uartx", 0 }, /* UART11 */ + [ASPEED_CLK_GATE_UART12CLK] = { 60, -1, "uart12clk-gate", "uartx", 0 }, /* UART12 */ + [ASPEED_CLK_GATE_UART13CLK] = { 61, -1, "uart13clk-gate", "uartx", 0 }, /* UART13 */ + [ASPEED_CLK_GATE_FSICLK] = { 62, 59, "fsiclk-gate", NULL, 0 }, /* FSI */ +}; + +static const char * const eclk_parent_names[] = { "mpll", "hpll", "dpll" }; + +static const struct clk_div_table ast2600_eclk_div_table[] = { + { 0x0, 2 }, + { 0x1, 2 }, + { 0x2, 3 }, + { 0x3, 4 }, + { 0x4, 5 }, + { 0x5, 6 }, + { 0x6, 7 }, + { 0x7, 8 }, + { 0 } +}; + +static const struct clk_div_table ast2600_mac_div_table[] = { + { 0x0, 4 }, + { 0x1, 4 }, + { 0x2, 6 }, + { 0x3, 8 }, + { 0x4, 10 }, + { 0x5, 12 }, + { 0x6, 14 }, + { 0x7, 16 }, + { 0 } +}; + +static const struct clk_div_table ast2600_div_table[] = { + { 0x0, 4 }, + { 0x1, 8 }, + { 0x2, 12 }, + { 0x3, 16 }, + { 0x4, 20 }, + { 0x5, 24 }, + { 0x6, 28 }, + { 0x7, 32 }, + { 0 } +}; + +/* For hpll/dpll/epll/mpll */ +static struct clk_hw *ast2600_calc_pll(const char *name, u32 val) +{ + unsigned int mult, div; + + if (val & BIT(24)) { + /* Pass through mode */ + mult = div = 1; + } else { + /* F = 25Mhz * [(M + 2) / (n + 1)] / (p + 1) */ + u32 m = val & 0x1fff; + u32 n = (val >> 13) & 0x3f; + u32 p = (val >> 19) & 0xf; + mult = (m + 1) / (n + 1); + div = (p + 1); + } + return clk_hw_register_fixed_factor(NULL, name, "clkin", 0, + mult, div); +}; + +static struct clk_hw *ast2600_calc_apll(const char *name, u32 val) +{ + unsigned int mult, div; + + if (val & BIT(20)) { + /* Pass through mode */ + mult = div = 1; + } else { + /* F = 25Mhz * (2-od) * [(m + 2) / (n + 1)] */ + u32 m = (val >> 5) & 0x3f; + u32 od = (val >> 4) & 0x1; + u32 n = val & 0xf; + + mult = (2 - od) * (m + 2); + div = n + 1; + } + return clk_hw_register_fixed_factor(NULL, name, "clkin", 0, + mult, div); +}; + +static u32 get_bit(u8 idx) +{ + return BIT(idx % 32); +} + +static u32 get_reset_reg(struct aspeed_clk_gate *gate) +{ + if (gate->reset_idx < 32) + return ASPEED_G6_RESET_CTRL; + + return ASPEED_G6_RESET_CTRL2; +} + +static u32 get_clock_reg(struct aspeed_clk_gate *gate) +{ + if (gate->clock_idx < 32) + return ASPEED_G6_CLK_STOP_CTRL; + + return ASPEED_G6_CLK_STOP_CTRL2; +} + +static int aspeed_g6_clk_is_enabled(struct clk_hw *hw) +{ + struct aspeed_clk_gate *gate = to_aspeed_clk_gate(hw); + u32 clk = get_bit(gate->clock_idx); + u32 rst = get_bit(gate->reset_idx); + u32 reg; + u32 enval; + + /* + * If the IP is in reset, treat the clock as not enabled, + * this happens with some clocks such as the USB one when + * coming from cold reset. Without this, aspeed_clk_enable() + * will fail to lift the reset. + */ + if (gate->reset_idx >= 0) { + regmap_read(gate->map, get_reset_reg(gate), ®); + + if (reg & rst) + return 0; + } + + regmap_read(gate->map, get_clock_reg(gate), ®); + + enval = (gate->flags & CLK_GATE_SET_TO_DISABLE) ? 0 : clk; + + return ((reg & clk) == enval) ? 1 : 0; +} + +static int aspeed_g6_clk_enable(struct clk_hw *hw) +{ + struct aspeed_clk_gate *gate = to_aspeed_clk_gate(hw); + unsigned long flags; + u32 clk = get_bit(gate->clock_idx); + u32 rst = get_bit(gate->reset_idx); + + spin_lock_irqsave(gate->lock, flags); + + if (aspeed_g6_clk_is_enabled(hw)) { + spin_unlock_irqrestore(gate->lock, flags); + return 0; + } + + if (gate->reset_idx >= 0) { + /* Put IP in reset */ + regmap_write(gate->map, get_reset_reg(gate), rst); + /* Delay 100us */ + udelay(100); + } + + /* Enable clock */ + if (gate->flags & CLK_GATE_SET_TO_DISABLE) { + regmap_write(gate->map, get_clock_reg(gate), clk); + } else { + /* Use set to clear register */ + regmap_write(gate->map, get_clock_reg(gate) + 0x04, clk); + } + + if (gate->reset_idx >= 0) { + /* A delay of 10ms is specified by the ASPEED docs */ + mdelay(10); + /* Take IP out of reset */ + regmap_write(gate->map, get_reset_reg(gate) + 0x4, rst); + } + + spin_unlock_irqrestore(gate->lock, flags); + + return 0; +} + +static void aspeed_g6_clk_disable(struct clk_hw *hw) +{ + struct aspeed_clk_gate *gate = to_aspeed_clk_gate(hw); + unsigned long flags; + u32 clk = get_bit(gate->clock_idx); + + spin_lock_irqsave(gate->lock, flags); + + if (gate->flags & CLK_GATE_SET_TO_DISABLE) { + regmap_write(gate->map, get_clock_reg(gate), clk); + } else { + /* Use set to clear register */ + regmap_write(gate->map, get_clock_reg(gate) + 0x4, clk); + } + + spin_unlock_irqrestore(gate->lock, flags); +} + +static const struct clk_ops aspeed_g6_clk_gate_ops = { + .enable = aspeed_g6_clk_enable, + .disable = aspeed_g6_clk_disable, + .is_enabled = aspeed_g6_clk_is_enabled, +}; + +static int aspeed_g6_reset_deassert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct aspeed_reset *ar = to_aspeed_reset(rcdev); + u32 rst = get_bit(id); + u32 reg = id >= 32 ? ASPEED_G6_RESET_CTRL2 : ASPEED_G6_RESET_CTRL; + + /* Use set to clear register */ + return regmap_write(ar->map, reg + 0x04, rst); +} + +static int aspeed_g6_reset_assert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct aspeed_reset *ar = to_aspeed_reset(rcdev); + u32 rst = get_bit(id); + u32 reg = id >= 32 ? ASPEED_G6_RESET_CTRL2 : ASPEED_G6_RESET_CTRL; + + return regmap_write(ar->map, reg, rst); +} + +static int aspeed_g6_reset_status(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct aspeed_reset *ar = to_aspeed_reset(rcdev); + int ret; + u32 val; + u32 rst = get_bit(id); + u32 reg = id >= 32 ? ASPEED_G6_RESET_CTRL2 : ASPEED_G6_RESET_CTRL; + + ret = regmap_read(ar->map, reg, &val); + if (ret) + return ret; + + return !!(val & rst); +} + +static const struct reset_control_ops aspeed_g6_reset_ops = { + .assert = aspeed_g6_reset_assert, + .deassert = aspeed_g6_reset_deassert, + .status = aspeed_g6_reset_status, +}; + +static struct clk_hw *aspeed_g6_clk_hw_register_gate(struct device *dev, + const char *name, const char *parent_name, unsigned long flags, + struct regmap *map, u8 clock_idx, u8 reset_idx, + u8 clk_gate_flags, spinlock_t *lock) +{ + struct aspeed_clk_gate *gate; + struct clk_init_data init; + struct clk_hw *hw; + int ret; + + gate = kzalloc(sizeof(*gate), GFP_KERNEL); + if (!gate) + return ERR_PTR(-ENOMEM); + + init.name = name; + init.ops = &aspeed_g6_clk_gate_ops; + init.flags = flags; + init.parent_names = parent_name ? &parent_name : NULL; + init.num_parents = parent_name ? 1 : 0; + + gate->map = map; + gate->clock_idx = clock_idx; + gate->reset_idx = reset_idx; + gate->flags = clk_gate_flags; + gate->lock = lock; + gate->hw.init = &init; + + hw = &gate->hw; + ret = clk_hw_register(dev, hw); + if (ret) { + kfree(gate); + hw = ERR_PTR(ret); + } + + return hw; +} + +static const char * const vclk_parent_names[] = { + "dpll", + "d1pll", + "hclk", + "mclk", +}; + +static const char * const d1clk_parent_names[] = { + "dpll", + "epll", + "usb-phy-40m", + "gpioc6_clkin", + "dp_phy_pll", +}; + +static int aspeed_g6_clk_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct aspeed_reset *ar; + struct regmap *map; + struct clk_hw *hw; + u32 val, rate; + int i, ret; + + map = syscon_node_to_regmap(dev->of_node); + if (IS_ERR(map)) { + dev_err(dev, "no syscon regmap\n"); + return PTR_ERR(map); + } + + ar = devm_kzalloc(dev, sizeof(*ar), GFP_KERNEL); + if (!ar) + return -ENOMEM; + + ar->map = map; + + ar->rcdev.owner = THIS_MODULE; + ar->rcdev.nr_resets = 64; + ar->rcdev.ops = &aspeed_g6_reset_ops; + ar->rcdev.of_node = dev->of_node; + + ret = devm_reset_controller_register(dev, &ar->rcdev); + if (ret) { + dev_err(dev, "could not register reset controller\n"); + return ret; + } + + /* UART clock div13 setting */ + regmap_read(map, ASPEED_G6_MISC_CTRL, &val); + if (val & UART_DIV13_EN) + rate = 24000000 / 13; + else + rate = 24000000; + hw = clk_hw_register_fixed_rate(dev, "uart", NULL, 0, rate); + if (IS_ERR(hw)) + return PTR_ERR(hw); + aspeed_g6_clk_data->hws[ASPEED_CLK_UART] = hw; + + /* UART6~13 clock div13 setting */ + regmap_read(map, 0x80, &val); + if (val & BIT(31)) + rate = 24000000 / 13; + else + rate = 24000000; + hw = clk_hw_register_fixed_rate(dev, "uartx", NULL, 0, rate); + if (IS_ERR(hw)) + return PTR_ERR(hw); + aspeed_g6_clk_data->hws[ASPEED_CLK_UARTX] = hw; + + /* EMMC ext clock divider */ + hw = clk_hw_register_gate(dev, "emmc_extclk_gate", "hpll", 0, + scu_g6_base + ASPEED_G6_CLK_SELECTION1, 15, 0, + &aspeed_g6_clk_lock); + if (IS_ERR(hw)) + return PTR_ERR(hw); + hw = clk_hw_register_divider_table(dev, "emmc_extclk", "emmc_extclk_gate", 0, + scu_g6_base + ASPEED_G6_CLK_SELECTION1, 12, 3, 0, + ast2600_div_table, + &aspeed_g6_clk_lock); + if (IS_ERR(hw)) + return PTR_ERR(hw); + aspeed_g6_clk_data->hws[ASPEED_CLK_EMMC] = hw; + + /* SD/SDIO clock divider and gate */ + hw = clk_hw_register_gate(dev, "sd_extclk_gate", "hpll", 0, + scu_g6_base + ASPEED_G6_CLK_SELECTION4, 31, 0, + &aspeed_g6_clk_lock); + if (IS_ERR(hw)) + return PTR_ERR(hw); + hw = clk_hw_register_divider_table(dev, "sd_extclk", "sd_extclk_gate", + 0, scu_g6_base + ASPEED_G6_CLK_SELECTION4, 28, 3, 0, + ast2600_div_table, + &aspeed_g6_clk_lock); + if (IS_ERR(hw)) + return PTR_ERR(hw); + aspeed_g6_clk_data->hws[ASPEED_CLK_SDIO] = hw; + + /* MAC1/2 AHB bus clock divider */ + hw = clk_hw_register_divider_table(dev, "mac12", "hpll", 0, + scu_g6_base + ASPEED_G6_CLK_SELECTION1, 16, 3, 0, + ast2600_mac_div_table, + &aspeed_g6_clk_lock); + if (IS_ERR(hw)) + return PTR_ERR(hw); + aspeed_g6_clk_data->hws[ASPEED_CLK_MAC12] = hw; + + /* MAC3/4 AHB bus clock divider */ + hw = clk_hw_register_divider_table(dev, "mac34", "hpll", 0, + scu_g6_base + 0x310, 24, 3, 0, + ast2600_mac_div_table, + &aspeed_g6_clk_lock); + if (IS_ERR(hw)) + return PTR_ERR(hw); + aspeed_g6_clk_data->hws[ASPEED_CLK_MAC34] = hw; + + /* LPC Host (LHCLK) clock divider */ + hw = clk_hw_register_divider_table(dev, "lhclk", "hpll", 0, + scu_g6_base + ASPEED_G6_CLK_SELECTION1, 20, 3, 0, + ast2600_div_table, + &aspeed_g6_clk_lock); + if (IS_ERR(hw)) + return PTR_ERR(hw); + aspeed_g6_clk_data->hws[ASPEED_CLK_LHCLK] = hw; + + /* gfx d1clk : use dp clk */ + regmap_update_bits(map, ASPEED_G6_CLK_SELECTION1, GENMASK(10, 8), BIT(10)); + /* SoC Display clock selection */ + hw = clk_hw_register_mux(dev, "d1clk", d1clk_parent_names, + ARRAY_SIZE(d1clk_parent_names), 0, + scu_g6_base + ASPEED_G6_CLK_SELECTION1, 8, 3, 0, + &aspeed_g6_clk_lock); + if (IS_ERR(hw)) + return PTR_ERR(hw); + aspeed_g6_clk_data->hws[ASPEED_CLK_D1CLK] = hw; + + /* d1 clk div 0x308[17:15] x [14:12] - 8,7,6,5,4,3,2,1 */ + regmap_write(map, 0x308, 0x12000); /* 3x3 = 9 */ + + /* P-Bus (BCLK) clock divider */ + hw = clk_hw_register_divider_table(dev, "bclk", "hpll", 0, + scu_g6_base + ASPEED_G6_CLK_SELECTION1, 20, 3, 0, + ast2600_div_table, + &aspeed_g6_clk_lock); + if (IS_ERR(hw)) + return PTR_ERR(hw); + aspeed_g6_clk_data->hws[ASPEED_CLK_BCLK] = hw; + + /* Video Capture clock selection */ + hw = clk_hw_register_mux(dev, "vclk", vclk_parent_names, + ARRAY_SIZE(vclk_parent_names), 0, + scu_g6_base + ASPEED_G6_CLK_SELECTION2, 12, 3, 0, + &aspeed_g6_clk_lock); + if (IS_ERR(hw)) + return PTR_ERR(hw); + aspeed_g6_clk_data->hws[ASPEED_CLK_VCLK] = hw; + + /* Video Engine clock divider */ + hw = clk_hw_register_divider_table(dev, "eclk", NULL, 0, + scu_g6_base + ASPEED_G6_CLK_SELECTION1, 28, 3, 0, + ast2600_eclk_div_table, + &aspeed_g6_clk_lock); + if (IS_ERR(hw)) + return PTR_ERR(hw); + aspeed_g6_clk_data->hws[ASPEED_CLK_ECLK] = hw; + + for (i = 0; i < ARRAY_SIZE(aspeed_g6_gates); i++) { + const struct aspeed_gate_data *gd = &aspeed_g6_gates[i]; + u32 gate_flags; + + /* + * Special case: the USB port 1 clock (bit 14) is always + * working the opposite way from the other ones. + */ + gate_flags = (gd->clock_idx == 14) ? 0 : CLK_GATE_SET_TO_DISABLE; + hw = aspeed_g6_clk_hw_register_gate(dev, + gd->name, + gd->parent_name, + gd->flags, + map, + gd->clock_idx, + gd->reset_idx, + gate_flags, + &aspeed_g6_clk_lock); + if (IS_ERR(hw)) + return PTR_ERR(hw); + aspeed_g6_clk_data->hws[i] = hw; + } + + return 0; +}; + +static const struct of_device_id aspeed_g6_clk_dt_ids[] = { + { .compatible = "aspeed,ast2600-scu" }, + { } +}; + +static struct platform_driver aspeed_g6_clk_driver = { + .probe = aspeed_g6_clk_probe, + .driver = { + .name = "ast2600-clk", + .of_match_table = aspeed_g6_clk_dt_ids, + .suppress_bind_attrs = true, + }, +}; +builtin_platform_driver(aspeed_g6_clk_driver); + +static const u32 ast2600_a0_axi_ahb_div_table[] = { + 2, 2, 3, 5, +}; + +static const u32 ast2600_a1_axi_ahb_div_table[] = { + 4, 6, 2, 4, +}; + +static void __init aspeed_g6_cc(struct regmap *map) +{ + struct clk_hw *hw; + u32 val, div, chip_id, axi_div, ahb_div; + + clk_hw_register_fixed_rate(NULL, "clkin", NULL, 0, 25000000); + + /* + * High-speed PLL clock derived from the crystal. This the CPU clock, + * and we assume that it is enabled + */ + regmap_read(map, ASPEED_HPLL_PARAM, &val); + aspeed_g6_clk_data->hws[ASPEED_CLK_HPLL] = ast2600_calc_pll("hpll", val); + + regmap_read(map, ASPEED_MPLL_PARAM, &val); + aspeed_g6_clk_data->hws[ASPEED_CLK_MPLL] = ast2600_calc_pll("mpll", val); + + regmap_read(map, ASPEED_DPLL_PARAM, &val); + aspeed_g6_clk_data->hws[ASPEED_CLK_DPLL] = ast2600_calc_pll("dpll", val); + + regmap_read(map, ASPEED_EPLL_PARAM, &val); + aspeed_g6_clk_data->hws[ASPEED_CLK_EPLL] = ast2600_calc_pll("epll", val); + + regmap_read(map, ASPEED_APLL_PARAM, &val); + aspeed_g6_clk_data->hws[ASPEED_CLK_APLL] = ast2600_calc_apll("apll", val); + + /* Strap bits 12:11 define the AXI/AHB clock frequency ratio (aka HCLK)*/ + regmap_read(map, ASPEED_G6_STRAP1, &val); + if (val & BIT(16)) + axi_div = 1; + else + axi_div = 2; + + regmap_read(map, ASPEED_G6_SILICON_REV, &chip_id); + if (chip_id & BIT(16)) + ahb_div = ast2600_a1_axi_ahb_div_table[(val >> 11) & 0x3]; + else + ahb_div = ast2600_a0_axi_ahb_div_table[(val >> 11) & 0x3]; + + hw = clk_hw_register_fixed_factor(NULL, "ahb", "hpll", 0, 1, axi_div * ahb_div); + aspeed_g6_clk_data->hws[ASPEED_CLK_AHB] = hw; + + regmap_read(map, ASPEED_G6_CLK_SELECTION1, &val); + val = (val >> 23) & 0x7; + div = 4 * (val + 1); + hw = clk_hw_register_fixed_factor(NULL, "apb1", "hpll", 0, 1, div); + aspeed_g6_clk_data->hws[ASPEED_CLK_APB1] = hw; + + regmap_read(map, ASPEED_G6_CLK_SELECTION4, &val); + val = (val >> 9) & 0x7; + div = 2 * (val + 1); + hw = clk_hw_register_fixed_factor(NULL, "apb2", "ahb", 0, 1, div); + aspeed_g6_clk_data->hws[ASPEED_CLK_APB2] = hw; + + /* USB 2.0 port1 phy 40MHz clock */ + hw = clk_hw_register_fixed_rate(NULL, "usb-phy-40m", NULL, 0, 40000000); + aspeed_g6_clk_data->hws[ASPEED_CLK_USBPHY_40M] = hw; +}; + +static void __init aspeed_g6_cc_init(struct device_node *np) +{ + struct regmap *map; + int ret; + int i; + + scu_g6_base = of_iomap(np, 0); + if (!scu_g6_base) + return; + + aspeed_g6_clk_data = kzalloc(struct_size(aspeed_g6_clk_data, hws, + ASPEED_G6_NUM_CLKS), GFP_KERNEL); + if (!aspeed_g6_clk_data) + return; + + /* + * This way all clocks fetched before the platform device probes, + * except those we assign here for early use, will be deferred. + */ + for (i = 0; i < ASPEED_G6_NUM_CLKS; i++) + aspeed_g6_clk_data->hws[i] = ERR_PTR(-EPROBE_DEFER); + + /* + * We check that the regmap works on this very first access, + * but as this is an MMIO-backed regmap, subsequent regmap + * access is not going to fail and we skip error checks from + * this point. + */ + map = syscon_node_to_regmap(np); + if (IS_ERR(map)) { + pr_err("no syscon regmap\n"); + return; + } + + aspeed_g6_cc(map); + aspeed_g6_clk_data->num = ASPEED_G6_NUM_CLKS; + ret = of_clk_add_hw_provider(np, of_clk_hw_onecell_get, aspeed_g6_clk_data); + if (ret) + pr_err("failed to add DT provider: %d\n", ret); +}; +CLK_OF_DECLARE_DRIVER(aspeed_cc_g6, "aspeed,ast2600-scu", aspeed_g6_cc_init); |