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linux_dsm_epyc7002/drivers/clk/clk-qoriq.c
Scott Wood 7c1c5413a7 clk: qoriq: Don't allow CPU clocks higher than starting value 
The boot-time frequency of a CPU is considered its rated maximum, as we
have no other source of such information.  However, this was previously
only used for chips with 80% restrictions on secondary PLLs.  This
usually wasn't a problem because most chips/configs boot with a divider
of /1, with other dividers being used only for dynamic frequency
reduction.  However, at least one config (LS1021A at less than 1 GHz)
uses a different divider for top speed.  This was causing cpufreq to set
a frequency beyond the chip's rated speed.

This is fixed by applying a 100%-of-initial-speed limit to all CPU PLLs,
similar to the existing 80% limit that only applied to some.

Signed-off-by: Scott Wood <oss@buserror.net>
Cc: stable@vger.kernel.org
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
2016-11-01 17:26:15 -07:00

1289 lines
29 KiB
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/*
* Copyright 2013 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* clock driver for Freescale QorIQ SoCs.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/fsl/guts.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/of.h>
#include <linux/slab.h>
#define PLL_DIV1 0
#define PLL_DIV2 1
#define PLL_DIV3 2
#define PLL_DIV4 3
#define PLATFORM_PLL 0
#define CGA_PLL1 1
#define CGA_PLL2 2
#define CGA_PLL3 3
#define CGA_PLL4 4 /* only on clockgen-1.0, which lacks CGB */
#define CGB_PLL1 4
#define CGB_PLL2 5
struct clockgen_pll_div {
struct clk *clk;
char name[32];
};
struct clockgen_pll {
struct clockgen_pll_div div[4];
};
#define CLKSEL_VALID 1
#define CLKSEL_80PCT 2 /* Only allowed if PLL <= 80% of max cpu freq */
struct clockgen_sourceinfo {
u32 flags; /* CLKSEL_xxx */
int pll; /* CGx_PLLn */
int div; /* PLL_DIVn */
};
#define NUM_MUX_PARENTS 16
struct clockgen_muxinfo {
struct clockgen_sourceinfo clksel[NUM_MUX_PARENTS];
};
#define NUM_HWACCEL 5
#define NUM_CMUX 8
struct clockgen;
/*
* cmux freq must be >= platform pll.
* If not set, cmux freq must be >= platform pll/2
*/
#define CG_CMUX_GE_PLAT 1
#define CG_PLL_8BIT 2 /* PLLCnGSR[CFG] is 8 bits, not 6 */
#define CG_VER3 4 /* version 3 cg: reg layout different */
#define CG_LITTLE_ENDIAN 8
struct clockgen_chipinfo {
const char *compat, *guts_compat;
const struct clockgen_muxinfo *cmux_groups[2];
const struct clockgen_muxinfo *hwaccel[NUM_HWACCEL];
void (*init_periph)(struct clockgen *cg);
int cmux_to_group[NUM_CMUX]; /* -1 terminates if fewer than NUM_CMUX */
u32 pll_mask; /* 1 << n bit set if PLL n is valid */
u32 flags; /* CG_xxx */
};
struct clockgen {
struct device_node *node;
void __iomem *regs;
struct clockgen_chipinfo info; /* mutable copy */
struct clk *sysclk;
struct clockgen_pll pll[6];
struct clk *cmux[NUM_CMUX];
struct clk *hwaccel[NUM_HWACCEL];
struct clk *fman[2];
struct ccsr_guts __iomem *guts;
};
static struct clockgen clockgen;
static void cg_out(struct clockgen *cg, u32 val, u32 __iomem *reg)
{
if (cg->info.flags & CG_LITTLE_ENDIAN)
iowrite32(val, reg);
else
iowrite32be(val, reg);
}
static u32 cg_in(struct clockgen *cg, u32 __iomem *reg)
{
u32 val;
if (cg->info.flags & CG_LITTLE_ENDIAN)
val = ioread32(reg);
else
val = ioread32be(reg);
return val;
}
static const struct clockgen_muxinfo p2041_cmux_grp1 = {
{
[0] = { CLKSEL_VALID, CGA_PLL1, PLL_DIV1 },
[1] = { CLKSEL_VALID, CGA_PLL1, PLL_DIV2 },
[4] = { CLKSEL_VALID, CGA_PLL2, PLL_DIV1 },
}
};
static const struct clockgen_muxinfo p2041_cmux_grp2 = {
{
[0] = { CLKSEL_VALID, CGA_PLL1, PLL_DIV1 },
[4] = { CLKSEL_VALID, CGA_PLL2, PLL_DIV1 },
[5] = { CLKSEL_VALID, CGA_PLL2, PLL_DIV2 },
}
};
static const struct clockgen_muxinfo p5020_cmux_grp1 = {
{
[0] = { CLKSEL_VALID, CGA_PLL1, PLL_DIV1 },
[1] = { CLKSEL_VALID, CGA_PLL1, PLL_DIV2 },
[4] = { CLKSEL_VALID | CLKSEL_80PCT, CGA_PLL2, PLL_DIV1 },
}
};
static const struct clockgen_muxinfo p5020_cmux_grp2 = {
{
[0] = { CLKSEL_VALID | CLKSEL_80PCT, CGA_PLL1, PLL_DIV1 },
[4] = { CLKSEL_VALID, CGA_PLL2, PLL_DIV1 },
[5] = { CLKSEL_VALID, CGA_PLL2, PLL_DIV2 },
}
};
static const struct clockgen_muxinfo p5040_cmux_grp1 = {
{
[0] = { CLKSEL_VALID, CGA_PLL1, PLL_DIV1 },
[1] = { CLKSEL_VALID, CGA_PLL1, PLL_DIV2 },
[4] = { CLKSEL_VALID | CLKSEL_80PCT, CGA_PLL2, PLL_DIV1 },
[5] = { CLKSEL_VALID | CLKSEL_80PCT, CGA_PLL2, PLL_DIV2 },
}
};
static const struct clockgen_muxinfo p5040_cmux_grp2 = {
{
[0] = { CLKSEL_VALID | CLKSEL_80PCT, CGA_PLL1, PLL_DIV1 },
[1] = { CLKSEL_VALID | CLKSEL_80PCT, CGA_PLL1, PLL_DIV2 },
[4] = { CLKSEL_VALID, CGA_PLL2, PLL_DIV1 },
[5] = { CLKSEL_VALID, CGA_PLL2, PLL_DIV2 },
}
};
static const struct clockgen_muxinfo p4080_cmux_grp1 = {
{
[0] = { CLKSEL_VALID, CGA_PLL1, PLL_DIV1 },
[1] = { CLKSEL_VALID, CGA_PLL1, PLL_DIV2 },
[4] = { CLKSEL_VALID, CGA_PLL2, PLL_DIV1 },
[5] = { CLKSEL_VALID, CGA_PLL2, PLL_DIV2 },
[8] = { CLKSEL_VALID | CLKSEL_80PCT, CGA_PLL3, PLL_DIV1 },
}
};
static const struct clockgen_muxinfo p4080_cmux_grp2 = {
{
[0] = { CLKSEL_VALID | CLKSEL_80PCT, CGA_PLL1, PLL_DIV1 },
[8] = { CLKSEL_VALID, CGA_PLL3, PLL_DIV1 },
[9] = { CLKSEL_VALID, CGA_PLL3, PLL_DIV2 },
[12] = { CLKSEL_VALID, CGA_PLL4, PLL_DIV1 },
[13] = { CLKSEL_VALID, CGA_PLL4, PLL_DIV2 },
}
};
static const struct clockgen_muxinfo t1023_cmux = {
{
[0] = { CLKSEL_VALID, CGA_PLL1, PLL_DIV1 },
[1] = { CLKSEL_VALID, CGA_PLL1, PLL_DIV2 },
}
};
static const struct clockgen_muxinfo t1040_cmux = {
{
[0] = { CLKSEL_VALID, CGA_PLL1, PLL_DIV1 },
[1] = { CLKSEL_VALID, CGA_PLL1, PLL_DIV2 },
[4] = { CLKSEL_VALID, CGA_PLL2, PLL_DIV1 },
[5] = { CLKSEL_VALID, CGA_PLL2, PLL_DIV2 },
}
};
static const struct clockgen_muxinfo clockgen2_cmux_cga = {
{
{ CLKSEL_VALID, CGA_PLL1, PLL_DIV1 },
{ CLKSEL_VALID, CGA_PLL1, PLL_DIV2 },
{ CLKSEL_VALID, CGA_PLL1, PLL_DIV4 },
{},
{ CLKSEL_VALID, CGA_PLL2, PLL_DIV1 },
{ CLKSEL_VALID, CGA_PLL2, PLL_DIV2 },
{ CLKSEL_VALID, CGA_PLL2, PLL_DIV4 },
{},
{ CLKSEL_VALID, CGA_PLL3, PLL_DIV1 },
{ CLKSEL_VALID, CGA_PLL3, PLL_DIV2 },
{ CLKSEL_VALID, CGA_PLL3, PLL_DIV4 },
},
};
static const struct clockgen_muxinfo clockgen2_cmux_cga12 = {
{
{ CLKSEL_VALID, CGA_PLL1, PLL_DIV1 },
{ CLKSEL_VALID, CGA_PLL1, PLL_DIV2 },
{ CLKSEL_VALID, CGA_PLL1, PLL_DIV4 },
{},
{ CLKSEL_VALID, CGA_PLL2, PLL_DIV1 },
{ CLKSEL_VALID, CGA_PLL2, PLL_DIV2 },
{ CLKSEL_VALID, CGA_PLL2, PLL_DIV4 },
},
};
static const struct clockgen_muxinfo clockgen2_cmux_cgb = {
{
{ CLKSEL_VALID, CGB_PLL1, PLL_DIV1 },
{ CLKSEL_VALID, CGB_PLL1, PLL_DIV2 },
{ CLKSEL_VALID, CGB_PLL1, PLL_DIV4 },
{},
{ CLKSEL_VALID, CGB_PLL2, PLL_DIV1 },
{ CLKSEL_VALID, CGB_PLL2, PLL_DIV2 },
{ CLKSEL_VALID, CGB_PLL2, PLL_DIV4 },
},
};
static const struct clockgen_muxinfo ls1043a_hwa1 = {
{
{},
{},
{ CLKSEL_VALID, CGA_PLL1, PLL_DIV2 },
{ CLKSEL_VALID, CGA_PLL1, PLL_DIV3 },
{},
{},
{ CLKSEL_VALID, CGA_PLL2, PLL_DIV2 },
{ CLKSEL_VALID, CGA_PLL2, PLL_DIV3 },
},
};
static const struct clockgen_muxinfo ls1043a_hwa2 = {
{
{},
{ CLKSEL_VALID, CGA_PLL2, PLL_DIV1 },
{},
{ CLKSEL_VALID, CGA_PLL2, PLL_DIV3 },
},
};
static const struct clockgen_muxinfo t1023_hwa1 = {
{
{},
{ CLKSEL_VALID, CGA_PLL1, PLL_DIV1 },
{ CLKSEL_VALID, CGA_PLL1, PLL_DIV2 },
{ CLKSEL_VALID, CGA_PLL1, PLL_DIV3 },
},
};
static const struct clockgen_muxinfo t1023_hwa2 = {
{
[6] = { CLKSEL_VALID, CGA_PLL1, PLL_DIV2 },
},
};
static const struct clockgen_muxinfo t2080_hwa1 = {
{
{},
{ CLKSEL_VALID, CGA_PLL1, PLL_DIV1 },
{ CLKSEL_VALID, CGA_PLL1, PLL_DIV2 },
{ CLKSEL_VALID, CGA_PLL1, PLL_DIV3 },
{ CLKSEL_VALID, CGA_PLL1, PLL_DIV4 },
{ CLKSEL_VALID, PLATFORM_PLL, PLL_DIV1 },
{ CLKSEL_VALID, CGA_PLL2, PLL_DIV2 },
{ CLKSEL_VALID, CGA_PLL2, PLL_DIV3 },
},
};
static const struct clockgen_muxinfo t2080_hwa2 = {
{
{},
{ CLKSEL_VALID, CGA_PLL2, PLL_DIV1 },
{ CLKSEL_VALID, CGA_PLL2, PLL_DIV2 },
{ CLKSEL_VALID, CGA_PLL2, PLL_DIV3 },
{ CLKSEL_VALID, CGA_PLL2, PLL_DIV4 },
{ CLKSEL_VALID, PLATFORM_PLL, PLL_DIV1 },
{ CLKSEL_VALID, CGA_PLL1, PLL_DIV2 },
{ CLKSEL_VALID, CGA_PLL1, PLL_DIV3 },
},
};
static const struct clockgen_muxinfo t4240_hwa1 = {
{
{ CLKSEL_VALID, PLATFORM_PLL, PLL_DIV2 },
{ CLKSEL_VALID, CGA_PLL1, PLL_DIV1 },
{ CLKSEL_VALID, CGA_PLL1, PLL_DIV2 },
{ CLKSEL_VALID, CGA_PLL1, PLL_DIV3 },
{ CLKSEL_VALID, CGA_PLL1, PLL_DIV4 },
{},
{ CLKSEL_VALID, CGA_PLL2, PLL_DIV2 },
{ CLKSEL_VALID, CGA_PLL2, PLL_DIV3 },
},
};
static const struct clockgen_muxinfo t4240_hwa4 = {
{
[2] = { CLKSEL_VALID, CGB_PLL1, PLL_DIV2 },
[3] = { CLKSEL_VALID, CGB_PLL1, PLL_DIV3 },
[4] = { CLKSEL_VALID, CGB_PLL1, PLL_DIV4 },
[5] = { CLKSEL_VALID, PLATFORM_PLL, PLL_DIV1 },
[6] = { CLKSEL_VALID, CGB_PLL2, PLL_DIV2 },
},
};
static const struct clockgen_muxinfo t4240_hwa5 = {
{
[2] = { CLKSEL_VALID, CGB_PLL2, PLL_DIV2 },
[3] = { CLKSEL_VALID, CGB_PLL2, PLL_DIV3 },
[4] = { CLKSEL_VALID, CGB_PLL2, PLL_DIV4 },
[5] = { CLKSEL_VALID, PLATFORM_PLL, PLL_DIV1 },
[6] = { CLKSEL_VALID, CGB_PLL1, PLL_DIV2 },
[7] = { CLKSEL_VALID, CGB_PLL1, PLL_DIV3 },
},
};
#define RCWSR7_FM1_CLK_SEL 0x40000000
#define RCWSR7_FM2_CLK_SEL 0x20000000
#define RCWSR7_HWA_ASYNC_DIV 0x04000000
static void __init p2041_init_periph(struct clockgen *cg)
{
u32 reg;
reg = ioread32be(&cg->guts->rcwsr[7]);
if (reg & RCWSR7_FM1_CLK_SEL)
cg->fman[0] = cg->pll[CGA_PLL2].div[PLL_DIV2].clk;
else
cg->fman[0] = cg->pll[PLATFORM_PLL].div[PLL_DIV2].clk;
}
static void __init p4080_init_periph(struct clockgen *cg)
{
u32 reg;
reg = ioread32be(&cg->guts->rcwsr[7]);
if (reg & RCWSR7_FM1_CLK_SEL)
cg->fman[0] = cg->pll[CGA_PLL3].div[PLL_DIV2].clk;
else
cg->fman[0] = cg->pll[PLATFORM_PLL].div[PLL_DIV2].clk;
if (reg & RCWSR7_FM2_CLK_SEL)
cg->fman[1] = cg->pll[CGA_PLL3].div[PLL_DIV2].clk;
else
cg->fman[1] = cg->pll[PLATFORM_PLL].div[PLL_DIV2].clk;
}
static void __init p5020_init_periph(struct clockgen *cg)
{
u32 reg;
int div = PLL_DIV2;
reg = ioread32be(&cg->guts->rcwsr[7]);
if (reg & RCWSR7_HWA_ASYNC_DIV)
div = PLL_DIV4;
if (reg & RCWSR7_FM1_CLK_SEL)
cg->fman[0] = cg->pll[CGA_PLL2].div[div].clk;
else
cg->fman[0] = cg->pll[PLATFORM_PLL].div[PLL_DIV2].clk;
}
static void __init p5040_init_periph(struct clockgen *cg)
{
u32 reg;
int div = PLL_DIV2;
reg = ioread32be(&cg->guts->rcwsr[7]);
if (reg & RCWSR7_HWA_ASYNC_DIV)
div = PLL_DIV4;
if (reg & RCWSR7_FM1_CLK_SEL)
cg->fman[0] = cg->pll[CGA_PLL3].div[div].clk;
else
cg->fman[0] = cg->pll[PLATFORM_PLL].div[PLL_DIV2].clk;
if (reg & RCWSR7_FM2_CLK_SEL)
cg->fman[1] = cg->pll[CGA_PLL3].div[div].clk;
else
cg->fman[1] = cg->pll[PLATFORM_PLL].div[PLL_DIV2].clk;
}
static void __init t1023_init_periph(struct clockgen *cg)
{
cg->fman[0] = cg->hwaccel[1];
}
static void __init t1040_init_periph(struct clockgen *cg)
{
cg->fman[0] = cg->pll[PLATFORM_PLL].div[PLL_DIV1].clk;
}
static void __init t2080_init_periph(struct clockgen *cg)
{
cg->fman[0] = cg->hwaccel[0];
}
static void __init t4240_init_periph(struct clockgen *cg)
{
cg->fman[0] = cg->hwaccel[3];
cg->fman[1] = cg->hwaccel[4];
}
static const struct clockgen_chipinfo chipinfo[] = {
{
.compat = "fsl,b4420-clockgen",
.guts_compat = "fsl,b4860-device-config",
.init_periph = t2080_init_periph,
.cmux_groups = {
&clockgen2_cmux_cga12, &clockgen2_cmux_cgb
},
.hwaccel = {
&t2080_hwa1
},
.cmux_to_group = {
0, 1, 1, 1, -1
},
.pll_mask = 0x3f,
.flags = CG_PLL_8BIT,
},
{
.compat = "fsl,b4860-clockgen",
.guts_compat = "fsl,b4860-device-config",
.init_periph = t2080_init_periph,
.cmux_groups = {
&clockgen2_cmux_cga12, &clockgen2_cmux_cgb
},
.hwaccel = {
&t2080_hwa1
},
.cmux_to_group = {
0, 1, 1, 1, -1
},
.pll_mask = 0x3f,
.flags = CG_PLL_8BIT,
},
{
.compat = "fsl,ls1021a-clockgen",
.cmux_groups = {
&t1023_cmux
},
.cmux_to_group = {
0, -1
},
.pll_mask = 0x03,
},
{
.compat = "fsl,ls1043a-clockgen",
.init_periph = t2080_init_periph,
.cmux_groups = {
&t1040_cmux
},
.hwaccel = {
&ls1043a_hwa1, &ls1043a_hwa2
},
.cmux_to_group = {
0, -1
},
.pll_mask = 0x07,
.flags = CG_PLL_8BIT,
},
{
.compat = "fsl,ls2080a-clockgen",
.cmux_groups = {
&clockgen2_cmux_cga12, &clockgen2_cmux_cgb
},
.cmux_to_group = {
0, 0, 1, 1, -1
},
.pll_mask = 0x37,
.flags = CG_VER3 | CG_LITTLE_ENDIAN,
},
{
.compat = "fsl,p2041-clockgen",
.guts_compat = "fsl,qoriq-device-config-1.0",
.init_periph = p2041_init_periph,
.cmux_groups = {
&p2041_cmux_grp1, &p2041_cmux_grp2
},
.cmux_to_group = {
0, 0, 1, 1, -1
},
.pll_mask = 0x07,
},
{
.compat = "fsl,p3041-clockgen",
.guts_compat = "fsl,qoriq-device-config-1.0",
.init_periph = p2041_init_periph,
.cmux_groups = {
&p2041_cmux_grp1, &p2041_cmux_grp2
},
.cmux_to_group = {
0, 0, 1, 1, -1
},
.pll_mask = 0x07,
},
{
.compat = "fsl,p4080-clockgen",
.guts_compat = "fsl,qoriq-device-config-1.0",
.init_periph = p4080_init_periph,
.cmux_groups = {
&p4080_cmux_grp1, &p4080_cmux_grp2
},
.cmux_to_group = {
0, 0, 0, 0, 1, 1, 1, 1
},
.pll_mask = 0x1f,
},
{
.compat = "fsl,p5020-clockgen",
.guts_compat = "fsl,qoriq-device-config-1.0",
.init_periph = p5020_init_periph,
.cmux_groups = {
&p2041_cmux_grp1, &p2041_cmux_grp2
},
.cmux_to_group = {
0, 1, -1
},
.pll_mask = 0x07,
},
{
.compat = "fsl,p5040-clockgen",
.guts_compat = "fsl,p5040-device-config",
.init_periph = p5040_init_periph,
.cmux_groups = {
&p5040_cmux_grp1, &p5040_cmux_grp2
},
.cmux_to_group = {
0, 0, 1, 1, -1
},
.pll_mask = 0x0f,
},
{
.compat = "fsl,t1023-clockgen",
.guts_compat = "fsl,t1023-device-config",
.init_periph = t1023_init_periph,
.cmux_groups = {
&t1023_cmux
},
.hwaccel = {
&t1023_hwa1, &t1023_hwa2
},
.cmux_to_group = {
0, 0, -1
},
.pll_mask = 0x03,
.flags = CG_PLL_8BIT,
},
{
.compat = "fsl,t1040-clockgen",
.guts_compat = "fsl,t1040-device-config",
.init_periph = t1040_init_periph,
.cmux_groups = {
&t1040_cmux
},
.cmux_to_group = {
0, 0, 0, 0, -1
},
.pll_mask = 0x07,
.flags = CG_PLL_8BIT,
},
{
.compat = "fsl,t2080-clockgen",
.guts_compat = "fsl,t2080-device-config",
.init_periph = t2080_init_periph,
.cmux_groups = {
&clockgen2_cmux_cga12
},
.hwaccel = {
&t2080_hwa1, &t2080_hwa2
},
.cmux_to_group = {
0, -1
},
.pll_mask = 0x07,
.flags = CG_PLL_8BIT,
},
{
.compat = "fsl,t4240-clockgen",
.guts_compat = "fsl,t4240-device-config",
.init_periph = t4240_init_periph,
.cmux_groups = {
&clockgen2_cmux_cga, &clockgen2_cmux_cgb
},
.hwaccel = {
&t4240_hwa1, NULL, NULL, &t4240_hwa4, &t4240_hwa5
},
.cmux_to_group = {
0, 0, 1, -1
},
.pll_mask = 0x3f,
.flags = CG_PLL_8BIT,
},
{},
};
struct mux_hwclock {
struct clk_hw hw;
struct clockgen *cg;
const struct clockgen_muxinfo *info;
u32 __iomem *reg;
u8 parent_to_clksel[NUM_MUX_PARENTS];
s8 clksel_to_parent[NUM_MUX_PARENTS];
int num_parents;
};
#define to_mux_hwclock(p) container_of(p, struct mux_hwclock, hw)
#define CLKSEL_MASK 0x78000000
#define CLKSEL_SHIFT 27
static int mux_set_parent(struct clk_hw *hw, u8 idx)
{
struct mux_hwclock *hwc = to_mux_hwclock(hw);
u32 clksel;
if (idx >= hwc->num_parents)
return -EINVAL;
clksel = hwc->parent_to_clksel[idx];
cg_out(hwc->cg, (clksel << CLKSEL_SHIFT) & CLKSEL_MASK, hwc->reg);
return 0;
}
static u8 mux_get_parent(struct clk_hw *hw)
{
struct mux_hwclock *hwc = to_mux_hwclock(hw);
u32 clksel;
s8 ret;
clksel = (cg_in(hwc->cg, hwc->reg) & CLKSEL_MASK) >> CLKSEL_SHIFT;
ret = hwc->clksel_to_parent[clksel];
if (ret < 0) {
pr_err("%s: mux at %p has bad clksel\n", __func__, hwc->reg);
return 0;
}
return ret;
}
static const struct clk_ops cmux_ops = {
.get_parent = mux_get_parent,
.set_parent = mux_set_parent,
};
/*
* Don't allow setting for now, as the clock options haven't been
* sanitized for additional restrictions.
*/
static const struct clk_ops hwaccel_ops = {
.get_parent = mux_get_parent,
};
static const struct clockgen_pll_div *get_pll_div(struct clockgen *cg,
struct mux_hwclock *hwc,
int idx)
{
int pll, div;
if (!(hwc->info->clksel[idx].flags & CLKSEL_VALID))
return NULL;
pll = hwc->info->clksel[idx].pll;
div = hwc->info->clksel[idx].div;
return &cg->pll[pll].div[div];
}
static struct clk * __init create_mux_common(struct clockgen *cg,
struct mux_hwclock *hwc,
const struct clk_ops *ops,
unsigned long min_rate,
unsigned long max_rate,
unsigned long pct80_rate,
const char *fmt, int idx)
{
struct clk_init_data init = {};
struct clk *clk;
const struct clockgen_pll_div *div;
const char *parent_names[NUM_MUX_PARENTS];
char name[32];
int i, j;
snprintf(name, sizeof(name), fmt, idx);
for (i = 0, j = 0; i < NUM_MUX_PARENTS; i++) {
unsigned long rate;
hwc->clksel_to_parent[i] = -1;
div = get_pll_div(cg, hwc, i);
if (!div)
continue;
rate = clk_get_rate(div->clk);
if (hwc->info->clksel[i].flags & CLKSEL_80PCT &&
rate > pct80_rate)
continue;
if (rate < min_rate)
continue;
if (rate > max_rate)
continue;
parent_names[j] = div->name;
hwc->parent_to_clksel[j] = i;
hwc->clksel_to_parent[i] = j;
j++;
}
init.name = name;
init.ops = ops;
init.parent_names = parent_names;
init.num_parents = hwc->num_parents = j;
init.flags = 0;
hwc->hw.init = &init;
hwc->cg = cg;
clk = clk_register(NULL, &hwc->hw);
if (IS_ERR(clk)) {
pr_err("%s: Couldn't register %s: %ld\n", __func__, name,
PTR_ERR(clk));
kfree(hwc);
return NULL;
}
return clk;
}
static struct clk * __init create_one_cmux(struct clockgen *cg, int idx)
{
struct mux_hwclock *hwc;
const struct clockgen_pll_div *div;
unsigned long plat_rate, min_rate;
u64 max_rate, pct80_rate;
u32 clksel;
hwc = kzalloc(sizeof(*hwc), GFP_KERNEL);
if (!hwc)
return NULL;
if (cg->info.flags & CG_VER3)
hwc->reg = cg->regs + 0x70000 + 0x20 * idx;
else
hwc->reg = cg->regs + 0x20 * idx;
hwc->info = cg->info.cmux_groups[cg->info.cmux_to_group[idx]];
/*
* Find the rate for the default clksel, and treat it as the
* maximum rated core frequency. If this is an incorrect
* assumption, certain clock options (possibly including the
* default clksel) may be inappropriately excluded on certain
* chips.
*/
clksel = (cg_in(cg, hwc->reg) & CLKSEL_MASK) >> CLKSEL_SHIFT;
div = get_pll_div(cg, hwc, clksel);
if (!div) {
kfree(hwc);
return NULL;
}
max_rate = clk_get_rate(div->clk);
pct80_rate = max_rate * 8;
do_div(pct80_rate, 10);
plat_rate = clk_get_rate(cg->pll[PLATFORM_PLL].div[PLL_DIV1].clk);
if (cg->info.flags & CG_CMUX_GE_PLAT)
min_rate = plat_rate;
else
min_rate = plat_rate / 2;
return create_mux_common(cg, hwc, &cmux_ops, min_rate, max_rate,
pct80_rate, "cg-cmux%d", idx);
}
static struct clk * __init create_one_hwaccel(struct clockgen *cg, int idx)
{
struct mux_hwclock *hwc;
hwc = kzalloc(sizeof(*hwc), GFP_KERNEL);
if (!hwc)
return NULL;
hwc->reg = cg->regs + 0x20 * idx + 0x10;
hwc->info = cg->info.hwaccel[idx];
return create_mux_common(cg, hwc, &hwaccel_ops, 0, ULONG_MAX, 0,
"cg-hwaccel%d", idx);
}
static void __init create_muxes(struct clockgen *cg)
{
int i;
for (i = 0; i < ARRAY_SIZE(cg->cmux); i++) {
if (cg->info.cmux_to_group[i] < 0)
break;
if (cg->info.cmux_to_group[i] >=
ARRAY_SIZE(cg->info.cmux_groups)) {
WARN_ON_ONCE(1);
continue;
}
cg->cmux[i] = create_one_cmux(cg, i);
}
for (i = 0; i < ARRAY_SIZE(cg->hwaccel); i++) {
if (!cg->info.hwaccel[i])
continue;
cg->hwaccel[i] = create_one_hwaccel(cg, i);
}
}
static void __init clockgen_init(struct device_node *np);
/* Legacy nodes may get probed before the parent clockgen node */
static void __init legacy_init_clockgen(struct device_node *np)
{
if (!clockgen.node)
clockgen_init(of_get_parent(np));
}
/* Legacy node */
static void __init core_mux_init(struct device_node *np)
{
struct clk *clk;
struct resource res;
int idx, rc;
legacy_init_clockgen(np);
if (of_address_to_resource(np, 0, &res))
return;
idx = (res.start & 0xf0) >> 5;
clk = clockgen.cmux[idx];
rc = of_clk_add_provider(np, of_clk_src_simple_get, clk);
if (rc) {
pr_err("%s: Couldn't register clk provider for node %s: %d\n",
__func__, np->name, rc);
return;
}
}
static struct clk __init
*sysclk_from_fixed(struct device_node *node, const char *name)
{
u32 rate;
if (of_property_read_u32(node, "clock-frequency", &rate))
return ERR_PTR(-ENODEV);
return clk_register_fixed_rate(NULL, name, NULL, 0, rate);
}
static struct clk *sysclk_from_parent(const char *name)
{
struct clk *clk;
const char *parent_name;
clk = of_clk_get(clockgen.node, 0);
if (IS_ERR(clk))
return clk;
/* Register the input clock under the desired name. */
parent_name = __clk_get_name(clk);
clk = clk_register_fixed_factor(NULL, name, parent_name,
0, 1, 1);
if (IS_ERR(clk))
pr_err("%s: Couldn't register %s: %ld\n", __func__, name,
PTR_ERR(clk));
return clk;
}
static struct clk * __init create_sysclk(const char *name)
{
struct device_node *sysclk;
struct clk *clk;
clk = sysclk_from_fixed(clockgen.node, name);
if (!IS_ERR(clk))
return clk;
clk = sysclk_from_parent(name);
if (!IS_ERR(clk))
return clk;
sysclk = of_get_child_by_name(clockgen.node, "sysclk");
if (sysclk) {
clk = sysclk_from_fixed(sysclk, name);
if (!IS_ERR(clk))
return clk;
}
pr_err("%s: No input clock\n", __func__);
return NULL;
}
/* Legacy node */
static void __init sysclk_init(struct device_node *node)
{
struct clk *clk;
legacy_init_clockgen(node);
clk = clockgen.sysclk;
if (clk)
of_clk_add_provider(node, of_clk_src_simple_get, clk);
}
#define PLL_KILL BIT(31)
static void __init create_one_pll(struct clockgen *cg, int idx)
{
u32 __iomem *reg;
u32 mult;
struct clockgen_pll *pll = &cg->pll[idx];
int i;
if (!(cg->info.pll_mask & (1 << idx)))
return;
if (cg->info.flags & CG_VER3) {
switch (idx) {
case PLATFORM_PLL:
reg = cg->regs + 0x60080;
break;
case CGA_PLL1:
reg = cg->regs + 0x80;
break;
case CGA_PLL2:
reg = cg->regs + 0xa0;
break;
case CGB_PLL1:
reg = cg->regs + 0x10080;
break;
case CGB_PLL2:
reg = cg->regs + 0x100a0;
break;
default:
WARN_ONCE(1, "index %d\n", idx);
return;
}
} else {
if (idx == PLATFORM_PLL)
reg = cg->regs + 0xc00;
else
reg = cg->regs + 0x800 + 0x20 * (idx - 1);
}
/* Get the multiple of PLL */
mult = cg_in(cg, reg);
/* Check if this PLL is disabled */
if (mult & PLL_KILL) {
pr_debug("%s(): pll %p disabled\n", __func__, reg);
return;
}
if ((cg->info.flags & CG_VER3) ||
((cg->info.flags & CG_PLL_8BIT) && idx != PLATFORM_PLL))
mult = (mult & GENMASK(8, 1)) >> 1;
else
mult = (mult & GENMASK(6, 1)) >> 1;
for (i = 0; i < ARRAY_SIZE(pll->div); i++) {
struct clk *clk;
snprintf(pll->div[i].name, sizeof(pll->div[i].name),
"cg-pll%d-div%d", idx, i + 1);
clk = clk_register_fixed_factor(NULL,
pll->div[i].name, "cg-sysclk", 0, mult, i + 1);
if (IS_ERR(clk)) {
pr_err("%s: %s: register failed %ld\n",
__func__, pll->div[i].name, PTR_ERR(clk));
continue;
}
pll->div[i].clk = clk;
}
}
static void __init create_plls(struct clockgen *cg)
{
int i;
for (i = 0; i < ARRAY_SIZE(cg->pll); i++)
create_one_pll(cg, i);
}
static void __init legacy_pll_init(struct device_node *np, int idx)
{
struct clockgen_pll *pll;
struct clk_onecell_data *onecell_data;
struct clk **subclks;
int count, rc;
legacy_init_clockgen(np);
pll = &clockgen.pll[idx];
count = of_property_count_strings(np, "clock-output-names");
BUILD_BUG_ON(ARRAY_SIZE(pll->div) < 4);
subclks = kcalloc(4, sizeof(struct clk *), GFP_KERNEL);
if (!subclks)
return;
onecell_data = kmalloc(sizeof(*onecell_data), GFP_KERNEL);
if (!onecell_data)
goto err_clks;
if (count <= 3) {
subclks[0] = pll->div[0].clk;
subclks[1] = pll->div[1].clk;
subclks[2] = pll->div[3].clk;
} else {
subclks[0] = pll->div[0].clk;
subclks[1] = pll->div[1].clk;
subclks[2] = pll->div[2].clk;
subclks[3] = pll->div[3].clk;
}
onecell_data->clks = subclks;
onecell_data->clk_num = count;
rc = of_clk_add_provider(np, of_clk_src_onecell_get, onecell_data);
if (rc) {
pr_err("%s: Couldn't register clk provider for node %s: %d\n",
__func__, np->name, rc);
goto err_cell;
}
return;
err_cell:
kfree(onecell_data);
err_clks:
kfree(subclks);
}
/* Legacy node */
static void __init pltfrm_pll_init(struct device_node *np)
{
legacy_pll_init(np, PLATFORM_PLL);
}
/* Legacy node */
static void __init core_pll_init(struct device_node *np)
{
struct resource res;
int idx;
if (of_address_to_resource(np, 0, &res))
return;
if ((res.start & 0xfff) == 0xc00) {
/*
* ls1021a devtree labels the platform PLL
* with the core PLL compatible
*/
pltfrm_pll_init(np);
} else {
idx = (res.start & 0xf0) >> 5;
legacy_pll_init(np, CGA_PLL1 + idx);
}
}
static struct clk *clockgen_clk_get(struct of_phandle_args *clkspec, void *data)
{
struct clockgen *cg = data;
struct clk *clk;
struct clockgen_pll *pll;
u32 type, idx;
if (clkspec->args_count < 2) {
pr_err("%s: insufficient phandle args\n", __func__);
return ERR_PTR(-EINVAL);
}
type = clkspec->args[0];
idx = clkspec->args[1];
switch (type) {
case 0:
if (idx != 0)
goto bad_args;
clk = cg->sysclk;
break;
case 1:
if (idx >= ARRAY_SIZE(cg->cmux))
goto bad_args;
clk = cg->cmux[idx];
break;
case 2:
if (idx >= ARRAY_SIZE(cg->hwaccel))
goto bad_args;
clk = cg->hwaccel[idx];
break;
case 3:
if (idx >= ARRAY_SIZE(cg->fman))
goto bad_args;
clk = cg->fman[idx];
break;
case 4:
pll = &cg->pll[PLATFORM_PLL];
if (idx >= ARRAY_SIZE(pll->div))
goto bad_args;
clk = pll->div[idx].clk;
break;
default:
goto bad_args;
}
if (!clk)
return ERR_PTR(-ENOENT);
return clk;
bad_args:
pr_err("%s: Bad phandle args %u %u\n", __func__, type, idx);
return ERR_PTR(-EINVAL);
}
#ifdef CONFIG_PPC
#include <asm/mpc85xx.h>
static const u32 a4510_svrs[] __initconst = {
(SVR_P2040 << 8) | 0x10, /* P2040 1.0 */
(SVR_P2040 << 8) | 0x11, /* P2040 1.1 */
(SVR_P2041 << 8) | 0x10, /* P2041 1.0 */
(SVR_P2041 << 8) | 0x11, /* P2041 1.1 */
(SVR_P3041 << 8) | 0x10, /* P3041 1.0 */
(SVR_P3041 << 8) | 0x11, /* P3041 1.1 */
(SVR_P4040 << 8) | 0x20, /* P4040 2.0 */
(SVR_P4080 << 8) | 0x20, /* P4080 2.0 */
(SVR_P5010 << 8) | 0x10, /* P5010 1.0 */
(SVR_P5010 << 8) | 0x20, /* P5010 2.0 */
(SVR_P5020 << 8) | 0x10, /* P5020 1.0 */
(SVR_P5021 << 8) | 0x10, /* P5021 1.0 */
(SVR_P5040 << 8) | 0x10, /* P5040 1.0 */
};
#define SVR_SECURITY 0x80000 /* The Security (E) bit */
static bool __init has_erratum_a4510(void)
{
u32 svr = mfspr(SPRN_SVR);
int i;
svr &= ~SVR_SECURITY;
for (i = 0; i < ARRAY_SIZE(a4510_svrs); i++) {
if (svr == a4510_svrs[i])
return true;
}
return false;
}
#else
static bool __init has_erratum_a4510(void)
{
return false;
}
#endif
static void __init clockgen_init(struct device_node *np)
{
int i, ret;
bool is_old_ls1021a = false;
/* May have already been called by a legacy probe */
if (clockgen.node)
return;
clockgen.node = np;
clockgen.regs = of_iomap(np, 0);
if (!clockgen.regs &&
of_device_is_compatible(of_root, "fsl,ls1021a")) {
/* Compatibility hack for old, broken device trees */
clockgen.regs = ioremap(0x1ee1000, 0x1000);
is_old_ls1021a = true;
}
if (!clockgen.regs) {
pr_err("%s(): %s: of_iomap() failed\n", __func__, np->name);
return;
}
for (i = 0; i < ARRAY_SIZE(chipinfo); i++) {
if (of_device_is_compatible(np, chipinfo[i].compat))
break;
if (is_old_ls1021a &&
!strcmp(chipinfo[i].compat, "fsl,ls1021a-clockgen"))
break;
}
if (i == ARRAY_SIZE(chipinfo)) {
pr_err("%s: unknown clockgen node %s\n", __func__,
np->full_name);
goto err;
}
clockgen.info = chipinfo[i];
if (clockgen.info.guts_compat) {
struct device_node *guts;
guts = of_find_compatible_node(NULL, NULL,
clockgen.info.guts_compat);
if (guts) {
clockgen.guts = of_iomap(guts, 0);
if (!clockgen.guts) {
pr_err("%s: Couldn't map %s regs\n", __func__,
guts->full_name);
}
}
}
if (has_erratum_a4510())
clockgen.info.flags |= CG_CMUX_GE_PLAT;
clockgen.sysclk = create_sysclk("cg-sysclk");
create_plls(&clockgen);
create_muxes(&clockgen);
if (clockgen.info.init_periph)
clockgen.info.init_periph(&clockgen);
ret = of_clk_add_provider(np, clockgen_clk_get, &clockgen);
if (ret) {
pr_err("%s: Couldn't register clk provider for node %s: %d\n",
__func__, np->name, ret);
}
return;
err:
iounmap(clockgen.regs);
clockgen.regs = NULL;
}
CLK_OF_DECLARE(qoriq_clockgen_1, "fsl,qoriq-clockgen-1.0", clockgen_init);
CLK_OF_DECLARE(qoriq_clockgen_2, "fsl,qoriq-clockgen-2.0", clockgen_init);
CLK_OF_DECLARE(qoriq_clockgen_ls1021a, "fsl,ls1021a-clockgen", clockgen_init);
CLK_OF_DECLARE(qoriq_clockgen_ls1043a, "fsl,ls1043a-clockgen", clockgen_init);
CLK_OF_DECLARE(qoriq_clockgen_ls2080a, "fsl,ls2080a-clockgen", clockgen_init);
/* Legacy nodes */
CLK_OF_DECLARE(qoriq_sysclk_1, "fsl,qoriq-sysclk-1.0", sysclk_init);
CLK_OF_DECLARE(qoriq_sysclk_2, "fsl,qoriq-sysclk-2.0", sysclk_init);
CLK_OF_DECLARE(qoriq_core_pll_1, "fsl,qoriq-core-pll-1.0", core_pll_init);
CLK_OF_DECLARE(qoriq_core_pll_2, "fsl,qoriq-core-pll-2.0", core_pll_init);
CLK_OF_DECLARE(qoriq_core_mux_1, "fsl,qoriq-core-mux-1.0", core_mux_init);
CLK_OF_DECLARE(qoriq_core_mux_2, "fsl,qoriq-core-mux-2.0", core_mux_init);
CLK_OF_DECLARE(qoriq_pltfrm_pll_1, "fsl,qoriq-platform-pll-1.0", pltfrm_pll_init);
CLK_OF_DECLARE(qoriq_pltfrm_pll_2, "fsl,qoriq-platform-pll-2.0", pltfrm_pll_init);
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