u-boot/arch/arm/mach-imx/mx7ulp/pcc.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

283 lines
7.4 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2016 Freescale Semiconductor, Inc.
*/
#include <common.h>
#include <div64.h>
#include <asm/io.h>
#include <errno.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/pcc.h>
#include <asm/arch/sys_proto.h>
#define PCC_CLKSRC_TYPES 2
#define PCC_CLKSRC_NUM 7
static enum scg_clk pcc_clksrc[PCC_CLKSRC_TYPES][PCC_CLKSRC_NUM] = {
{ SCG_NIC1_BUS_CLK,
SCG_NIC1_CLK,
SCG_DDR_CLK,
SCG_APLL_PFD2_CLK,
SCG_APLL_PFD1_CLK,
SCG_APLL_PFD0_CLK,
USB_PLL_OUT,
},
{ SCG_SOSC_DIV2_CLK, /* SOSC BUS clock */
MIPI_PLL_OUT,
SCG_FIRC_DIV2_CLK, /* FIRC BUS clock */
SCG_ROSC_CLK,
SCG_NIC1_BUS_CLK,
SCG_NIC1_CLK,
SCG_APLL_PFD3_CLK,
},
};
static struct pcc_entry pcc_arrays[] = {
{PCC2_RBASE, DMA1_PCC2_SLOT, CLKSRC_NO_PCS, PCC_NO_DIV},
{PCC2_RBASE, RGPIO1_PCC2_SLOT, CLKSRC_NO_PCS, PCC_NO_DIV},
{PCC2_RBASE, FLEXBUS0_PCC2_SLOT, CLKSRC_NO_PCS, PCC_NO_DIV},
{PCC2_RBASE, SEMA42_1_PCC2_SLOT, CLKSRC_NO_PCS, PCC_NO_DIV},
{PCC2_RBASE, DMA1_CH_MUX0_PCC2_SLOT, CLKSRC_NO_PCS, PCC_NO_DIV},
{PCC2_RBASE, SNVS_PCC2_SLOT, CLKSRC_NO_PCS, PCC_NO_DIV},
{PCC2_RBASE, CAAM_PCC2_SLOT, CLKSRC_NO_PCS, PCC_NO_DIV},
{PCC2_RBASE, LPTPM4_PCC2_SLOT, CLKSRC_PER_BUS, PCC_NO_DIV},
{PCC2_RBASE, LPTPM5_PCC2_SLOT, CLKSRC_PER_BUS, PCC_NO_DIV},
{PCC2_RBASE, LPIT1_PCC2_SLOT, CLKSRC_PER_BUS, PCC_NO_DIV},
{PCC2_RBASE, LPSPI2_PCC2_SLOT, CLKSRC_PER_BUS, PCC_NO_DIV},
{PCC2_RBASE, LPSPI3_PCC2_SLOT, CLKSRC_PER_BUS, PCC_NO_DIV},
{PCC2_RBASE, LPI2C4_PCC2_SLOT, CLKSRC_PER_BUS, PCC_NO_DIV},
{PCC2_RBASE, LPI2C5_PCC2_SLOT, CLKSRC_PER_BUS, PCC_NO_DIV},
{PCC2_RBASE, LPUART4_PCC2_SLOT, CLKSRC_PER_BUS, PCC_NO_DIV},
{PCC2_RBASE, LPUART5_PCC2_SLOT, CLKSRC_PER_BUS, PCC_NO_DIV},
{PCC2_RBASE, FLEXIO1_PCC2_SLOT, CLKSRC_PER_BUS, PCC_NO_DIV},
{PCC2_RBASE, USBOTG0_PCC2_SLOT, CLKSRC_PER_PLAT, PCC_HAS_DIV},
{PCC2_RBASE, USBOTG1_PCC2_SLOT, CLKSRC_PER_PLAT, PCC_HAS_DIV},
{PCC2_RBASE, USBPHY_PCC2_SLOT, CLKSRC_NO_PCS, PCC_NO_DIV},
{PCC2_RBASE, USB_PL301_PCC2_SLOT, CLKSRC_NO_PCS, PCC_NO_DIV},
{PCC2_RBASE, USDHC0_PCC2_SLOT, CLKSRC_PER_PLAT, PCC_HAS_DIV},
{PCC2_RBASE, USDHC1_PCC2_SLOT, CLKSRC_PER_PLAT, PCC_HAS_DIV},
{PCC2_RBASE, WDG1_PCC2_SLOT, CLKSRC_PER_BUS, PCC_HAS_DIV},
{PCC2_RBASE, WDG2_PCC2_SLOT, CLKSRC_PER_BUS, PCC_HAS_DIV},
{PCC3_RBASE, LPTPM6_PCC3_SLOT, CLKSRC_PER_BUS, PCC_NO_DIV},
{PCC3_RBASE, LPTPM7_PCC3_SLOT, CLKSRC_PER_BUS, PCC_NO_DIV},
{PCC3_RBASE, LPI2C6_PCC3_SLOT, CLKSRC_PER_BUS, PCC_NO_DIV},
{PCC3_RBASE, LPI2C7_PCC3_SLOT, CLKSRC_PER_BUS, PCC_NO_DIV},
{PCC3_RBASE, LPUART6_PCC3_SLOT, CLKSRC_PER_BUS, PCC_NO_DIV},
{PCC3_RBASE, LPUART7_PCC3_SLOT, CLKSRC_PER_BUS, PCC_NO_DIV},
{PCC3_RBASE, VIU0_PCC3_SLOT, CLKSRC_NO_PCS, PCC_NO_DIV},
{PCC3_RBASE, DSI0_PCC3_SLOT, CLKSRC_PER_BUS, PCC_HAS_DIV},
{PCC3_RBASE, LCDIF0_PCC3_SLOT, CLKSRC_PER_PLAT, PCC_HAS_DIV},
{PCC3_RBASE, MMDC0_PCC3_SLOT, CLKSRC_NO_PCS, PCC_NO_DIV},
{PCC3_RBASE, PORTC_PCC3_SLOT, CLKSRC_NO_PCS, PCC_NO_DIV},
{PCC3_RBASE, PORTD_PCC3_SLOT, CLKSRC_NO_PCS, PCC_NO_DIV},
{PCC3_RBASE, PORTE_PCC3_SLOT, CLKSRC_NO_PCS, PCC_NO_DIV},
{PCC3_RBASE, PORTF_PCC3_SLOT, CLKSRC_NO_PCS, PCC_NO_DIV},
{PCC3_RBASE, GPU3D_PCC3_SLOT, CLKSRC_PER_PLAT, PCC_NO_DIV},
{PCC3_RBASE, GPU2D_PCC3_SLOT, CLKSRC_PER_PLAT, PCC_NO_DIV},
};
int pcc_clock_enable(enum pcc_clk clk, bool enable)
{
u32 reg, val;
if (clk >= ARRAY_SIZE(pcc_arrays))
return -EINVAL;
reg = pcc_arrays[clk].pcc_base + pcc_arrays[clk].pcc_slot * 4;
val = readl(reg);
clk_debug("pcc_clock_enable: clk %d, reg 0x%x, val 0x%x, enable %d\n",
clk, reg, val, enable);
if (!(val & PCC_PR_MASK) || (val & PCC_INUSE_MASK))
return -EPERM;
if (enable)
val |= PCC_CGC_MASK;
else
val &= ~PCC_CGC_MASK;
writel(val, reg);
clk_debug("pcc_clock_enable: val 0x%x\n", val);
return 0;
}
/* The clock source select needs clock is disabled */
int pcc_clock_sel(enum pcc_clk clk, enum scg_clk src)
{
u32 reg, val, i, clksrc_type;
if (clk >= ARRAY_SIZE(pcc_arrays))
return -EINVAL;
clksrc_type = pcc_arrays[clk].clksrc;
if (clksrc_type >= CLKSRC_NO_PCS) {
printf("No PCS field for the PCC %d, clksrc type %d\n",
clk, clksrc_type);
return -EPERM;
}
for (i = 0; i < PCC_CLKSRC_NUM; i++) {
if (pcc_clksrc[clksrc_type][i] == src) {
/* Find the clock src, then set it to PCS */
break;
}
}
if (i == PCC_CLKSRC_NUM) {
printf("Not find the parent scg_clk in PCS of PCC %d, invalid scg_clk %d\n", clk, src);
return -EINVAL;
}
reg = pcc_arrays[clk].pcc_base + pcc_arrays[clk].pcc_slot * 4;
val = readl(reg);
clk_debug("pcc_clock_sel: clk %d, reg 0x%x, val 0x%x, clksrc_type %d\n",
clk, reg, val, clksrc_type);
if (!(val & PCC_PR_MASK) || (val & PCC_INUSE_MASK) ||
(val & PCC_CGC_MASK)) {
printf("Not permit to select clock source val = 0x%x\n", val);
return -EPERM;
}
val &= ~PCC_PCS_MASK;
val |= ((i + 1) << PCC_PCS_OFFSET);
writel(val, reg);
clk_debug("pcc_clock_sel: val 0x%x\n", val);
return 0;
}
int pcc_clock_div_config(enum pcc_clk clk, bool frac, u8 div)
{
u32 reg, val;
if (clk >= ARRAY_SIZE(pcc_arrays) || div > 8 ||
(div == 1 && frac != 0))
return -EINVAL;
if (pcc_arrays[clk].div >= PCC_NO_DIV) {
printf("No DIV/FRAC field for the PCC %d\n", clk);
return -EPERM;
}
reg = pcc_arrays[clk].pcc_base + pcc_arrays[clk].pcc_slot * 4;
val = readl(reg);
if (!(val & PCC_PR_MASK) || (val & PCC_INUSE_MASK) ||
(val & PCC_CGC_MASK)) {
printf("Not permit to set div/frac val = 0x%x\n", val);
return -EPERM;
}
if (frac)
val |= PCC_FRAC_MASK;
else
val &= ~PCC_FRAC_MASK;
val &= ~PCC_PCD_MASK;
val |= (div - 1) & PCC_PCD_MASK;
writel(val, reg);
return 0;
}
bool pcc_clock_is_enable(enum pcc_clk clk)
{
u32 reg, val;
if (clk >= ARRAY_SIZE(pcc_arrays))
return -EINVAL;
reg = pcc_arrays[clk].pcc_base + pcc_arrays[clk].pcc_slot * 4;
val = readl(reg);
if ((val & PCC_INUSE_MASK) || (val & PCC_CGC_MASK))
return true;
return false;
}
int pcc_clock_get_clksrc(enum pcc_clk clk, enum scg_clk *src)
{
u32 reg, val, clksrc_type;
if (clk >= ARRAY_SIZE(pcc_arrays))
return -EINVAL;
clksrc_type = pcc_arrays[clk].clksrc;
if (clksrc_type >= CLKSRC_NO_PCS) {
printf("No PCS field for the PCC %d, clksrc type %d\n",
clk, clksrc_type);
return -EPERM;
}
reg = pcc_arrays[clk].pcc_base + pcc_arrays[clk].pcc_slot * 4;
val = readl(reg);
clk_debug("pcc_clock_get_clksrc: clk %d, reg 0x%x, val 0x%x, type %d\n",
clk, reg, val, clksrc_type);
if (!(val & PCC_PR_MASK)) {
printf("This pcc slot is not present = 0x%x\n", val);
return -EPERM;
}
val &= PCC_PCS_MASK;
val = (val >> PCC_PCS_OFFSET);
if (!val) {
printf("Clock source is off\n");
return -EIO;
}
*src = pcc_clksrc[clksrc_type][val - 1];
clk_debug("pcc_clock_get_clksrc: parent scg clk %d\n", *src);
return 0;
}
u32 pcc_clock_get_rate(enum pcc_clk clk)
{
u32 reg, val, rate, frac, div;
enum scg_clk parent;
int ret;
ret = pcc_clock_get_clksrc(clk, &parent);
if (ret)
return 0;
rate = scg_clk_get_rate(parent);
clk_debug("pcc_clock_get_rate: parent rate %u\n", rate);
if (pcc_arrays[clk].div == PCC_HAS_DIV) {
reg = pcc_arrays[clk].pcc_base + pcc_arrays[clk].pcc_slot * 4;
val = readl(reg);
frac = (val & PCC_FRAC_MASK) >> PCC_FRAC_OFFSET;
div = (val & PCC_PCD_MASK) >> PCC_PCD_OFFSET;
/*
* Theoretically don't have overflow in the calc,
* the rate won't exceed 2G
*/
rate = rate * (frac + 1) / (div + 1);
}
clk_debug("pcc_clock_get_rate: rate %u\n", rate);
return rate;
}