diff options
Diffstat (limited to 'drivers/clk/microchip/mpfs_clk_periph.c')
| -rw-r--r-- | drivers/clk/microchip/mpfs_clk_periph.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/drivers/clk/microchip/mpfs_clk_periph.c b/drivers/clk/microchip/mpfs_clk_periph.c new file mode 100644 index 00000000000..41c6df4fb97 --- /dev/null +++ b/drivers/clk/microchip/mpfs_clk_periph.c @@ -0,0 +1,198 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2020 Microchip Technology Inc. + * Padmarao Begari <padmarao.begari@microchip.com> + */ +#include <clk.h> +#include <clk-uclass.h> +#include <asm/io.h> +#include <dm/device.h> +#include <dm/devres.h> +#include <dm/uclass.h> +#include <dt-bindings/clock/microchip-mpfs-clock.h> +#include <linux/err.h> + +#include "mpfs_clk.h" + +#define MPFS_PERIPH_CLOCK "mpfs_periph_clock" + +#define REG_CLOCK_CONFIG_CR 0x08 +#define REG_SUBBLK_CLOCK_CR 0x84 +#define REG_SUBBLK_RESET_CR 0x88 + +#define CFG_CPU_SHIFT 0x0 +#define CFG_AXI_SHIFT 0x2 +#define CFG_AHB_SHIFT 0x4 +#define CFG_WIDTH 0x2 + +/** + * struct mpfs_periph_clock - per instance of peripheral clock + * @id: index of a peripheral clock + * @parent_id: index of the parent clock + * @name: name of a peripheral clock + * @shift: shift to a peripheral clock bit field + * @flags: common clock framework flags + */ +struct mpfs_periph_clock { + unsigned int id; + unsigned int parent_id; + const char *name; + u8 shift; + unsigned long flags; +}; + +/** + * struct mpfs_periph_hw_clock - hardware peripheral clock + * @periph: peripheral clock instance + * @sys_base: base address of the mpfs system register + * @prate: the pll clock rate + * @hw: clock instance + */ +struct mpfs_periph_hw_clock { + struct mpfs_periph_clock periph; + void __iomem *sys_base; + u32 prate; + struct clk hw; +}; + +#define to_mpfs_periph_clk(_hw) container_of(_hw, struct mpfs_periph_hw_clock, hw) + +static int mpfs_periph_clk_enable(struct clk *hw) +{ + struct mpfs_periph_hw_clock *periph_hw = to_mpfs_periph_clk(hw); + struct mpfs_periph_clock *periph = &periph_hw->periph; + void __iomem *base_addr = periph_hw->sys_base; + u32 reg, val; + + if (periph->flags != CLK_IS_CRITICAL) { + reg = readl(base_addr + REG_SUBBLK_RESET_CR); + val = reg & ~(1u << periph->shift); + writel(val, base_addr + REG_SUBBLK_RESET_CR); + + reg = readl(base_addr + REG_SUBBLK_CLOCK_CR); + val = reg | (1u << periph->shift); + writel(val, base_addr + REG_SUBBLK_CLOCK_CR); + } + + return 0; +} + +static int mpfs_periph_clk_disable(struct clk *hw) +{ + struct mpfs_periph_hw_clock *periph_hw = to_mpfs_periph_clk(hw); + struct mpfs_periph_clock *periph = &periph_hw->periph; + void __iomem *base_addr = periph_hw->sys_base; + u32 reg, val; + + if (periph->flags != CLK_IS_CRITICAL) { + reg = readl(base_addr + REG_SUBBLK_RESET_CR); + val = reg | (1u << periph->shift); + writel(val, base_addr + REG_SUBBLK_RESET_CR); + + reg = readl(base_addr + REG_SUBBLK_CLOCK_CR); + val = reg & ~(1u << periph->shift); + writel(val, base_addr + REG_SUBBLK_CLOCK_CR); + } + + return 0; +} + +static ulong mpfs_periph_clk_recalc_rate(struct clk *hw) +{ + struct mpfs_periph_hw_clock *periph_hw = to_mpfs_periph_clk(hw); + + return periph_hw->prate; + +} + +#define CLK_PERIPH(_id, _name, _parent_id, _shift, _flags) { \ + .periph.id = _id, \ + .periph.parent_id = _parent_id, \ + .periph.name = _name, \ + .periph.shift = _shift, \ + .periph.flags = _flags, \ + } + +/* + * Critical clocks: + * - CLK_ENVM: reserved by hart software services (hss) superloop monitor/m mode interrupt + * trap handler + * - CLK_MMUART0: reserved by the hss + * - CLK_DDRC: provides clock to the ddr subsystem + * - CLK_RTC: the onboard RTC's AHB bus clock must be kept running as the rtc will stop + * if the AHB interface clock is disabled + * - CLK_FICx: these provide the processor side clocks to the "FIC" (Fabric InterConnect) + * clock domain crossers which provide the interface to the FPGA fabric. Disabling them + * causes the FPGA fabric to go into reset. + * - CLK_ATHENA: The athena clock is FIC4, which is reserved for the Athena TeraFire. + */ + +static struct mpfs_periph_hw_clock mpfs_periph_clks[] = { + CLK_PERIPH(CLK_ENVM, "clk_periph_envm", CLK_AHB, 0, CLK_IS_CRITICAL), + CLK_PERIPH(CLK_MAC0, "clk_periph_mac0", CLK_AHB, 1, 0), + CLK_PERIPH(CLK_MAC1, "clk_periph_mac1", CLK_AHB, 2, 0), + CLK_PERIPH(CLK_MMC, "clk_periph_mmc", CLK_AHB, 3, 0), + CLK_PERIPH(CLK_TIMER, "clk_periph_timer", CLK_RTCREF, 4, 0), + CLK_PERIPH(CLK_MMUART0, "clk_periph_mmuart0", CLK_AHB, 5, CLK_IS_CRITICAL), + CLK_PERIPH(CLK_MMUART1, "clk_periph_mmuart1", CLK_AHB, 6, 0), + CLK_PERIPH(CLK_MMUART2, "clk_periph_mmuart2", CLK_AHB, 7, 0), + CLK_PERIPH(CLK_MMUART3, "clk_periph_mmuart3", CLK_AHB, 8, 0), + CLK_PERIPH(CLK_MMUART4, "clk_periph_mmuart4", CLK_AHB, 9, 0), + CLK_PERIPH(CLK_SPI0, "clk_periph_spi0", CLK_AHB, 10, 0), + CLK_PERIPH(CLK_SPI1, "clk_periph_spi1", CLK_AHB, 11, 0), + CLK_PERIPH(CLK_I2C0, "clk_periph_i2c0", CLK_AHB, 12, 0), + CLK_PERIPH(CLK_I2C1, "clk_periph_i2c1", CLK_AHB, 13, 0), + CLK_PERIPH(CLK_CAN0, "clk_periph_can0", CLK_AHB, 14, 0), + CLK_PERIPH(CLK_CAN1, "clk_periph_can1", CLK_AHB, 15, 0), + CLK_PERIPH(CLK_USB, "clk_periph_usb", CLK_AHB, 16, 0), + CLK_PERIPH(CLK_RTC, "clk_periph_rtc", CLK_AHB, 18, CLK_IS_CRITICAL), + CLK_PERIPH(CLK_QSPI, "clk_periph_qspi", CLK_AHB, 19, 0), + CLK_PERIPH(CLK_GPIO0, "clk_periph_gpio0", CLK_AHB, 20, 0), + CLK_PERIPH(CLK_GPIO1, "clk_periph_gpio1", CLK_AHB, 21, 0), + CLK_PERIPH(CLK_GPIO2, "clk_periph_gpio2", CLK_AHB, 22, 0), + CLK_PERIPH(CLK_DDRC, "clk_periph_ddrc", CLK_AHB, 23, CLK_IS_CRITICAL), + CLK_PERIPH(CLK_FIC0, "clk_periph_fic0", CLK_AXI, 24, CLK_IS_CRITICAL), + CLK_PERIPH(CLK_FIC1, "clk_periph_fic1", CLK_AXI, 25, CLK_IS_CRITICAL), + CLK_PERIPH(CLK_FIC2, "clk_periph_fic2", CLK_AXI, 26, CLK_IS_CRITICAL), + CLK_PERIPH(CLK_FIC3, "clk_periph_fic3", CLK_AXI, 27, CLK_IS_CRITICAL), + CLK_PERIPH(CLK_ATHENA, "clk_periph_athena", CLK_AXI, 28, CLK_IS_CRITICAL), + CLK_PERIPH(CLK_CFM, "clk_periph_cfm", CLK_AHB, 29, 0), +}; + +int mpfs_clk_register_periphs(void __iomem *base, struct udevice *dev) +{ + int ret; + int i, id, num_clks; + const char *name; + struct clk *hw; + + num_clks = ARRAY_SIZE(mpfs_periph_clks); + for (i = 0; i < num_clks; i++) { + struct clk parent = { .id = mpfs_periph_clks[i].periph.parent_id }; + + clk_request(dev, &parent); + hw = &mpfs_periph_clks[i].hw; + mpfs_periph_clks[i].sys_base = base; + mpfs_periph_clks[i].prate = clk_get_rate(&parent); + name = mpfs_periph_clks[i].periph.name; + ret = clk_register(hw, MPFS_PERIPH_CLOCK, name, parent.dev->name); + if (ret) + ERR_PTR(ret); + id = mpfs_periph_clks[i].periph.id; + clk_dm(id, hw); + } + + return 0; +} + +const struct clk_ops mpfs_periph_clk_ops = { + .enable = mpfs_periph_clk_enable, + .disable = mpfs_periph_clk_disable, + .get_rate = mpfs_periph_clk_recalc_rate, +}; + +U_BOOT_DRIVER(mpfs_periph_clock) = { + .name = MPFS_PERIPH_CLOCK, + .id = UCLASS_CLK, + .ops = &mpfs_periph_clk_ops, +}; |