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2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/drivers/clk/clk-aspeed.c
....@@ -1,20 +1,20 @@
11 // SPDX-License-Identifier: GPL-2.0+
2
+// Copyright IBM Corp
23 
34 #define pr_fmt(fmt) "clk-aspeed: " fmt
45 
5
-#include <linux/clk-provider.h>
66 #include <linux/mfd/syscon.h>
77 #include <linux/of_address.h>
88 #include <linux/of_device.h>
99 #include <linux/platform_device.h>
1010 #include <linux/regmap.h>
11
-#include <linux/reset-controller.h>
1211 #include <linux/slab.h>
13
-#include <linux/spinlock.h>
1412 
1513 #include <dt-bindings/clock/aspeed-clock.h>
1614 
17
-#define ASPEED_NUM_CLKS		36
15
+#include "clk-aspeed.h"
16
+
17
+#define ASPEED_NUM_CLKS		38
1818 
1919 #define ASPEED_RESET2_OFFSET	32
2020 
....@@ -28,6 +28,7 @@
2828 #define  AST2400_HPLL_BYPASS_EN	BIT(17)
2929 #define ASPEED_MISC_CTRL	0x2c
3030 #define  UART_DIV13_EN		BIT(12)
31
+#define ASPEED_MAC_CLK_DLY	0x48
3132 #define ASPEED_STRAP		0x70
3233 #define  CLKIN_25MHZ_EN		BIT(23)
3334 #define  AST2400_CLK_SOURCE_SEL	BIT(18)
....@@ -42,55 +43,13 @@
4243 
4344 static void __iomem *scu_base;
4445 
45
-/**
46
- * struct aspeed_gate_data - Aspeed gated clocks
47
- * @clock_idx: bit used to gate this clock in the clock register
48
- * @reset_idx: bit used to reset this IP in the reset register. -1 if no
49
- *             reset is required when enabling the clock
50
- * @name: the clock name
51
- * @parent_name: the name of the parent clock
52
- * @flags: standard clock framework flags
53
- */
54
-struct aspeed_gate_data {
55
-	u8		clock_idx;
56
-	s8		reset_idx;
57
-	const char	*name;
58
-	const char	*parent_name;
59
-	unsigned long	flags;
60
-};
61
-
62
-/**
63
- * struct aspeed_clk_gate - Aspeed specific clk_gate structure
64
- * @hw:		handle between common and hardware-specific interfaces
65
- * @reg:	register controlling gate
66
- * @clock_idx:	bit used to gate this clock in the clock register
67
- * @reset_idx:	bit used to reset this IP in the reset register. -1 if no
68
- *		reset is required when enabling the clock
69
- * @flags:	hardware-specific flags
70
- * @lock:	register lock
71
- *
72
- * Some of the clocks in the Aspeed SoC must be put in reset before enabling.
73
- * This modified version of clk_gate allows an optional reset bit to be
74
- * specified.
75
- */
76
-struct aspeed_clk_gate {
77
-	struct clk_hw	hw;
78
-	struct regmap	*map;
79
-	u8		clock_idx;
80
-	s8		reset_idx;
81
-	u8		flags;
82
-	spinlock_t	*lock;
83
-};
84
-
85
-#define to_aspeed_clk_gate(_hw) container_of(_hw, struct aspeed_clk_gate, hw)
86
-
8746 /* TODO: ask Aspeed about the actual parent data */
8847 static const struct aspeed_gate_data aspeed_gates[] = {
8948 	/*				 clk rst   name			parent	flags */
90
-	[ASPEED_CLK_GATE_ECLK] =	{  0, -1, "eclk-gate",		"eclk",	0 }, /* Video Engine */
49
+	[ASPEED_CLK_GATE_ECLK] =	{  0,  6, "eclk-gate",		"eclk",	0 }, /* Video Engine */
9150 	[ASPEED_CLK_GATE_GCLK] =	{  1,  7, "gclk-gate",		NULL,	0 }, /* 2D engine */
9251 	[ASPEED_CLK_GATE_MCLK] =	{  2, -1, "mclk-gate",		"mpll",	CLK_IS_CRITICAL }, /* SDRAM */
93
-	[ASPEED_CLK_GATE_VCLK] =	{  3,  6, "vclk-gate",		NULL,	0 }, /* Video Capture */
52
+	[ASPEED_CLK_GATE_VCLK] =	{  3, -1, "vclk-gate",		NULL,	0 }, /* Video Capture */
9453 	[ASPEED_CLK_GATE_BCLK] =	{  4,  8, "bclk-gate",		"bclk",	CLK_IS_CRITICAL }, /* PCIe/PCI */
9554 	[ASPEED_CLK_GATE_DCLK] =	{  5, -1, "dclk-gate",		NULL,	CLK_IS_CRITICAL }, /* DAC */
9655 	[ASPEED_CLK_GATE_REFCLK] =	{  6, -1, "refclk-gate",	"clkin", CLK_IS_CRITICAL },
....@@ -111,6 +70,24 @@
11170 	[ASPEED_CLK_GATE_UART4CLK] =	{ 26, -1, "uart4clk-gate",	"uart",	0 }, /* UART4 */
11271 	[ASPEED_CLK_GATE_SDCLK] =	{ 27, 16, "sdclk-gate",		NULL,	0 }, /* SDIO/SD */
11372 	[ASPEED_CLK_GATE_LHCCLK] =	{ 28, -1, "lhclk-gate",		"lhclk", 0 }, /* LPC master/LPC+ */
73
+};
74
+
75
+static const char * const eclk_parent_names[] = {
76
+	"mpll",
77
+	"hpll",
78
+	"dpll",
79
+};
80
+
81
+static const struct clk_div_table ast2500_eclk_div_table[] = {
82
+	{ 0x0, 2 },
83
+	{ 0x1, 2 },
84
+	{ 0x2, 3 },
85
+	{ 0x3, 4 },
86
+	{ 0x4, 5 },
87
+	{ 0x5, 6 },
88
+	{ 0x6, 7 },
89
+	{ 0x7, 8 },
90
+	{ 0 }
11491 };
11592 
11693 static const struct clk_div_table ast2500_mac_div_table[] = {
....@@ -190,20 +167,16 @@
190167 			mult, div);
191168 }
192169 
193
-struct aspeed_clk_soc_data {
194
-	const struct clk_div_table *div_table;
195
-	const struct clk_div_table *mac_div_table;
196
-	struct clk_hw *(*calc_pll)(const char *name, u32 val);
197
-};
198
-
199170 static const struct aspeed_clk_soc_data ast2500_data = {
200171 	.div_table = ast2500_div_table,
172
+	.eclk_div_table = ast2500_eclk_div_table,
201173 	.mac_div_table = ast2500_mac_div_table,
202174 	.calc_pll = aspeed_ast2500_calc_pll,
203175 };
204176 
205177 static const struct aspeed_clk_soc_data ast2400_data = {
206178 	.div_table = ast2400_div_table,
179
+	.eclk_div_table = ast2400_div_table,
207180 	.mac_div_table = ast2400_div_table,
208181 	.calc_pll = aspeed_ast2400_calc_pll,
209182 };
....@@ -294,18 +267,6 @@
294267 	.is_enabled = aspeed_clk_is_enabled,
295268 };
296269 
297
-/**
298
- * struct aspeed_reset - Aspeed reset controller
299
- * @map: regmap to access the containing system controller
300
- * @rcdev: reset controller device
301
- */
302
-struct aspeed_reset {
303
-	struct regmap			*map;
304
-	struct reset_controller_dev	rcdev;
305
-};
306
-
307
-#define to_aspeed_reset(p) container_of((p), struct aspeed_reset, rcdev)
308
-
309270 static const u8 aspeed_resets[] = {
310271 	/* SCU04 resets */
311272 	[ASPEED_RESET_XDMA]	= 25,
....@@ -387,7 +348,7 @@
387348 		u8 clk_gate_flags, spinlock_t *lock)
388349 {
389350 	struct aspeed_clk_gate *gate;
390
-	struct clk_init_data init = {};
351
+	struct clk_init_data init;
391352 	struct clk_hw *hw;
392353 	int ret;
393354 
....@@ -479,9 +440,14 @@
479440 		return PTR_ERR(hw);
480441 	aspeed_clk_data->hws[ASPEED_CLK_MPLL] =	hw;
481442 
482
-	/* SD/SDIO clock divider (TODO: There's a gate too) */
483
-	hw = clk_hw_register_divider_table(dev, "sdio", "hpll", 0,
484
-			scu_base + ASPEED_CLK_SELECTION, 12, 3, 0,
443
+	/* SD/SDIO clock divider and gate */
444
+	hw = clk_hw_register_gate(dev, "sd_extclk_gate", "hpll", 0,
445
+				  scu_base + ASPEED_CLK_SELECTION, 15, 0,
446
+				  &aspeed_clk_lock);
447
+	if (IS_ERR(hw))
448
+		return PTR_ERR(hw);
449
+	hw = clk_hw_register_divider_table(dev, "sd_extclk", "sd_extclk_gate",
450
+			0, scu_base + ASPEED_CLK_SELECTION, 12, 3, 0,
485451 			soc_data->div_table,
486452 			&aspeed_clk_lock);
487453 	if (IS_ERR(hw))
....@@ -496,6 +462,30 @@
496462 	if (IS_ERR(hw))
497463 		return PTR_ERR(hw);
498464 	aspeed_clk_data->hws[ASPEED_CLK_MAC] = hw;
465
+
466
+	if (of_device_is_compatible(pdev->dev.of_node, "aspeed,ast2500-scu")) {
467
+		/* RMII 50MHz RCLK */
468
+		hw = clk_hw_register_fixed_rate(dev, "mac12rclk", "hpll", 0,
469
+						50000000);
470
+		if (IS_ERR(hw))
471
+			return PTR_ERR(hw);
472
+
473
+		/* RMII1 50MHz (RCLK) output enable */
474
+		hw = clk_hw_register_gate(dev, "mac1rclk", "mac12rclk", 0,
475
+				scu_base + ASPEED_MAC_CLK_DLY, 29, 0,
476
+				&aspeed_clk_lock);
477
+		if (IS_ERR(hw))
478
+			return PTR_ERR(hw);
479
+		aspeed_clk_data->hws[ASPEED_CLK_MAC1RCLK] = hw;
480
+
481
+		/* RMII2 50MHz (RCLK) output enable */
482
+		hw = clk_hw_register_gate(dev, "mac2rclk", "mac12rclk", 0,
483
+				scu_base + ASPEED_MAC_CLK_DLY, 30, 0,
484
+				&aspeed_clk_lock);
485
+		if (IS_ERR(hw))
486
+			return PTR_ERR(hw);
487
+		aspeed_clk_data->hws[ASPEED_CLK_MAC2RCLK] = hw;
488
+	}
499489 
500490 	/* LPC Host (LHCLK) clock divider */
501491 	hw = clk_hw_register_divider_table(dev, "lhclk", "hpll", 0,
....@@ -522,6 +512,22 @@
522512 		return PTR_ERR(hw);
523513 	aspeed_clk_data->hws[ASPEED_CLK_24M] = hw;
524514 
515
+	hw = clk_hw_register_mux(dev, "eclk-mux", eclk_parent_names,
516
+				 ARRAY_SIZE(eclk_parent_names), 0,
517
+				 scu_base + ASPEED_CLK_SELECTION, 2, 0x3, 0,
518
+				 &aspeed_clk_lock);
519
+	if (IS_ERR(hw))
520
+		return PTR_ERR(hw);
521
+	aspeed_clk_data->hws[ASPEED_CLK_ECLK_MUX] = hw;
522
+
523
+	hw = clk_hw_register_divider_table(dev, "eclk", "eclk-mux", 0,
524
+					   scu_base + ASPEED_CLK_SELECTION, 28,
525
+					   3, 0, soc_data->eclk_div_table,
526
+					   &aspeed_clk_lock);
527
+	if (IS_ERR(hw))
528
+		return PTR_ERR(hw);
529
+	aspeed_clk_data->hws[ASPEED_CLK_ECLK] = hw;
530
+
525531 	/*
526532 	 * TODO: There are a number of clocks that not included in this driver
527533 	 * as more information is required:
....@@ -531,7 +537,6 @@
531537 	 *   RGMII
532538 	 *   RMII
533539 	 *   UART[1..5] clock source mux
534
-	 *   Video Engine (ECLK) mux and clock divider
535540 	 */
536541 
537542 	for (i = 0; i < ARRAY_SIZE(aspeed_gates); i++) {