linux-next/drivers/clk/qcom/gpucc-sc7180.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2019, The Linux Foundation. All rights reserved.
 */

#include <linux/clk-provider.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>

#include <dt-bindings/clock/qcom,gpucc-sc7180.h>

#include "clk-alpha-pll.h"
#include "clk-branch.h"
#include "clk-rcg.h"
#include "clk-regmap.h"
#include "common.h"
#include "gdsc.h"

#define CX_GMU_CBCR_SLEEP_MASK		0xF
#define CX_GMU_CBCR_SLEEP_SHIFT		4
#define CX_GMU_CBCR_WAKE_MASK		0xF
#define CX_GMU_CBCR_WAKE_SHIFT		8
#define CLK_DIS_WAIT_SHIFT		12
#define CLK_DIS_WAIT_MASK		(0xf << CLK_DIS_WAIT_SHIFT)

enum {
	P_BI_TCXO,
	P_CORE_BI_PLL_TEST_SE,
	P_GPLL0_OUT_MAIN,
	P_GPLL0_OUT_MAIN_DIV,
	P_GPU_CC_PLL1_OUT_EVEN,
	P_GPU_CC_PLL1_OUT_MAIN,
	P_GPU_CC_PLL1_OUT_ODD,
};

static const struct pll_vco fabia_vco[] = {
	{ 249600000, 2000000000, 0 },
};

static struct clk_alpha_pll gpu_cc_pll1 = {
	.offset = 0x100,
	.vco_table = fabia_vco,
	.num_vco = ARRAY_SIZE(fabia_vco),
	.regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_FABIA],
	.clkr = {
		.hw.init = &(struct clk_init_data){
			.name = "gpu_cc_pll1",
			.parent_data =  &(const struct clk_parent_data){
				.fw_name = "bi_tcxo",
			},
			.num_parents = 1,
			.ops = &clk_alpha_pll_fabia_ops,
		},
	},
};

static const struct parent_map gpu_cc_parent_map_0[] = {
	{ P_BI_TCXO, 0 },
	{ P_GPU_CC_PLL1_OUT_MAIN, 3 },
	{ P_GPLL0_OUT_MAIN, 5 },
	{ P_GPLL0_OUT_MAIN_DIV, 6 },
};

static const struct clk_parent_data gpu_cc_parent_data_0[] = {
	{ .fw_name = "bi_tcxo" },
	{ .hw = &gpu_cc_pll1.clkr.hw },
	{ .fw_name = "gcc_gpu_gpll0_clk_src" },
	{ .fw_name = "gcc_gpu_gpll0_div_clk_src" },
};

static const struct freq_tbl ftbl_gpu_cc_gmu_clk_src[] = {
	F(19200000, P_BI_TCXO, 1, 0, 0),
	F(200000000, P_GPLL0_OUT_MAIN_DIV, 1.5, 0, 0),
	{ }
};

static struct clk_rcg2 gpu_cc_gmu_clk_src = {
	.cmd_rcgr = 0x1120,
	.mnd_width = 0,
	.hid_width = 5,
	.parent_map = gpu_cc_parent_map_0,
	.freq_tbl = ftbl_gpu_cc_gmu_clk_src,
	.clkr.hw.init = &(struct clk_init_data){
		.name = "gpu_cc_gmu_clk_src",
		.parent_data = gpu_cc_parent_data_0,
		.num_parents = ARRAY_SIZE(gpu_cc_parent_data_0),
		.flags = CLK_SET_RATE_PARENT,
		.ops = &clk_rcg2_shared_ops,
	},
};

static struct clk_branch gpu_cc_crc_ahb_clk = {
	.halt_reg = 0x107c,
	.halt_check = BRANCH_HALT_DELAY,
	.clkr = {
		.enable_reg = 0x107c,
		.enable_mask = BIT(0),
		.hw.init = &(struct clk_init_data){
			.name = "gpu_cc_crc_ahb_clk",
			.ops = &clk_branch2_ops,
		},
	},
};

static struct clk_branch gpu_cc_cx_gmu_clk = {
	.halt_reg = 0x1098,
	.halt_check = BRANCH_HALT,
	.clkr = {
		.enable_reg = 0x1098,
		.enable_mask = BIT(0),
		.hw.init = &(struct clk_init_data){
			.name = "gpu_cc_cx_gmu_clk",
			.parent_data =  &(const struct clk_parent_data){
				.hw = &gpu_cc_gmu_clk_src.clkr.hw,
			},
			.num_parents = 1,
			.flags = CLK_SET_RATE_PARENT,
			.ops = &clk_branch2_ops,
		},
	},
};

static struct clk_branch gpu_cc_cx_snoc_dvm_clk = {
	.halt_reg = 0x108c,
	.halt_check = BRANCH_HALT_DELAY,
	.clkr = {
		.enable_reg = 0x108c,
		.enable_mask = BIT(0),
		.hw.init = &(struct clk_init_data){
			.name = "gpu_cc_cx_snoc_dvm_clk",
			.ops = &clk_branch2_ops,
		},
	},
};

static struct clk_branch gpu_cc_cxo_aon_clk = {
	.halt_reg = 0x1004,
	.halt_check = BRANCH_HALT_DELAY,
	.clkr = {
		.enable_reg = 0x1004,
		.enable_mask = BIT(0),
		.hw.init = &(struct clk_init_data){
			.name = "gpu_cc_cxo_aon_clk",
			.ops = &clk_branch2_ops,
		},
	},
};

static struct clk_branch gpu_cc_cxo_clk = {
	.halt_reg = 0x109c,
	.halt_check = BRANCH_HALT,
	.clkr = {
		.enable_reg = 0x109c,
		.enable_mask = BIT(0),
		.hw.init = &(struct clk_init_data){
			.name = "gpu_cc_cxo_clk",
			.ops = &clk_branch2_ops,
		},
	},
};

static struct gdsc cx_gdsc = {
	.gdscr = 0x106c,
	.gds_hw_ctrl = 0x1540,
	.pd = {
		.name = "cx_gdsc",
	},
	.pwrsts = PWRSTS_OFF_ON,
	.flags = VOTABLE,
};

/*
 * On SC7180 the GPU GX domain is *almost* entirely controlled by the GMU
 * running in the CX domain so the CPU doesn't need to know anything about the
 * GX domain EXCEPT....
 *
 * Hardware constraints dictate that the GX be powered down before the CX. If
 * the GMU crashes it could leave the GX on. In order to successfully bring back
 * the device the CPU needs to disable the GX headswitch. There being no sane
 * way to reach in and touch that register from deep inside the GPU driver we
 * need to set up the infrastructure to be able to ensure that the GPU can
 * ensure that the GX is off during this super special case. We do this by
 * defining a GX gdsc with a dummy enable function and a "default" disable
 * function.
 *
 * This allows us to attach with genpd_dev_pm_attach_by_name() in the GPU
 * driver. During power up, nothing will happen from the CPU (and the GMU will
 * power up normally but during power down this will ensure that the GX domain
 * is *really* off - this gives us a semi standard way of doing what we need.
 */
static int gx_gdsc_enable(struct generic_pm_domain *domain)
{
	/* Do nothing but give genpd the impression that we were successful */
	return 0;
}

static struct gdsc gx_gdsc = {
	.gdscr = 0x100c,
	.clamp_io_ctrl = 0x1508,
	.pd = {
		.name = "gx_gdsc",
		.power_on = gx_gdsc_enable,
	},
	.pwrsts = PWRSTS_OFF_ON,
	.flags = CLAMP_IO,
};

static struct gdsc *gpu_cc_sc7180_gdscs[] = {
	[CX_GDSC] = &cx_gdsc,
	[GX_GDSC] = &gx_gdsc,
};

static struct clk_regmap *gpu_cc_sc7180_clocks[] = {
	[GPU_CC_CXO_CLK] = &gpu_cc_cxo_clk.clkr,
	[GPU_CC_CRC_AHB_CLK] = &gpu_cc_crc_ahb_clk.clkr,
	[GPU_CC_CX_GMU_CLK] = &gpu_cc_cx_gmu_clk.clkr,
	[GPU_CC_CX_SNOC_DVM_CLK] = &gpu_cc_cx_snoc_dvm_clk.clkr,
	[GPU_CC_CXO_AON_CLK] = &gpu_cc_cxo_aon_clk.clkr,
	[GPU_CC_GMU_CLK_SRC] = &gpu_cc_gmu_clk_src.clkr,
	[GPU_CC_PLL1] = &gpu_cc_pll1.clkr,
};

static const struct regmap_config gpu_cc_sc7180_regmap_config = {
	.reg_bits =	32,
	.reg_stride =	4,
	.val_bits =	32,
	.max_register =	0x8008,
	.fast_io =	true,
};

static const struct qcom_cc_desc gpu_cc_sc7180_desc = {
	.config = &gpu_cc_sc7180_regmap_config,
	.clks = gpu_cc_sc7180_clocks,
	.num_clks = ARRAY_SIZE(gpu_cc_sc7180_clocks),
	.gdscs = gpu_cc_sc7180_gdscs,
	.num_gdscs = ARRAY_SIZE(gpu_cc_sc7180_gdscs),
};

static const struct of_device_id gpu_cc_sc7180_match_table[] = {
	{ .compatible = "qcom,sc7180-gpucc" },
	{ }
};
MODULE_DEVICE_TABLE(of, gpu_cc_sc7180_match_table);

static int gpu_cc_sc7180_probe(struct platform_device *pdev)
{
	struct regmap *regmap;
	struct alpha_pll_config gpu_cc_pll_config = {};
	unsigned int value, mask;

	regmap = qcom_cc_map(pdev, &gpu_cc_sc7180_desc);
	if (IS_ERR(regmap))
		return PTR_ERR(regmap);

	/* 360MHz Configuration */
	gpu_cc_pll_config.l = 0x12;
	gpu_cc_pll_config.alpha = 0xc000;
	gpu_cc_pll_config.config_ctl_val = 0x20485699;
	gpu_cc_pll_config.config_ctl_hi_val = 0x00002067;
	gpu_cc_pll_config.user_ctl_val = 0x00000001;
	gpu_cc_pll_config.user_ctl_hi_val = 0x00004805;
	gpu_cc_pll_config.test_ctl_hi_val = 0x40000000;

	clk_fabia_pll_configure(&gpu_cc_pll1, regmap, &gpu_cc_pll_config);

	/* Recommended WAKEUP/SLEEP settings for the gpu_cc_cx_gmu_clk */
	mask = CX_GMU_CBCR_WAKE_MASK << CX_GMU_CBCR_WAKE_SHIFT;
	mask |= CX_GMU_CBCR_SLEEP_MASK << CX_GMU_CBCR_SLEEP_SHIFT;
	value = 0xF << CX_GMU_CBCR_WAKE_SHIFT | 0xF << CX_GMU_CBCR_SLEEP_SHIFT;
	regmap_update_bits(regmap, 0x1098, mask, value);

	/* Configure clk_dis_wait for gpu_cx_gdsc */
	regmap_update_bits(regmap, 0x106c, CLK_DIS_WAIT_MASK,
						8 << CLK_DIS_WAIT_SHIFT);

	return qcom_cc_really_probe(pdev, &gpu_cc_sc7180_desc, regmap);
}

static struct platform_driver gpu_cc_sc7180_driver = {
	.probe = gpu_cc_sc7180_probe,
	.driver = {
		.name = "sc7180-gpucc",
		.of_match_table = gpu_cc_sc7180_match_table,
	},
};

static int __init gpu_cc_sc7180_init(void)
{
	return platform_driver_register(&gpu_cc_sc7180_driver);
}
subsys_initcall(gpu_cc_sc7180_init);

static void __exit gpu_cc_sc7180_exit(void)
{
	platform_driver_unregister(&gpu_cc_sc7180_driver);
}
module_exit(gpu_cc_sc7180_exit);

MODULE_DESCRIPTION("QTI GPU_CC SC7180 Driver");
MODULE_LICENSE("GPL v2");