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u-boot/drivers/clk/clk_pic32.c
Stephen Warren 135aa95002 clk: convert API to match reset/mailbox style 
The following changes are made to the clock API:
* The concept of "clocks" and "peripheral clocks" are unified; each clock
  provider now implements a single set of clocks. This provides a simpler
  conceptual interface to clients, and better aligns with device tree
  clock bindings.
* Clocks are now identified with a single "struct clk", rather than
  requiring clients to store the clock provider device and clock identity
  values separately. For simple clock consumers, this isolates clients
  from internal details of the clock API.
* clk.h is split so it only contains the client/consumer API, whereas
  clk-uclass.h contains the provider API. This aligns with the recently
  added reset and mailbox APIs.
* clk_ops .of_xlate(), .request(), and .free() are added so providers
  can customize these operations if needed. This also aligns with the
  recently added reset and mailbox APIs.
* clk_disable() is added.
* All users of the current clock APIs are updated.
* Sandbox clock tests are updated to exercise clock lookup via DT, and
  clock enable/disable.
* rkclk_get_clk() is removed and replaced with standard APIs.

Buildman shows no clock-related errors for any board for which buildman
can download a toolchain.

test/py passes for sandbox (which invokes the dm clk test amongst
others).

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
2016-06-19 17:05:55 -06:00

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/*
* Copyright (C) 2015 Purna Chandra Mandal <purna.mandal@microchip.com>
*
* SPDX-License-Identifier: GPL-2.0+
*
*/
#include <common.h>
#include <clk-uclass.h>
#include <dm.h>
#include <div64.h>
#include <wait_bit.h>
#include <dm/lists.h>
#include <asm/io.h>
#include <mach/pic32.h>
#include <dt-bindings/clock/microchip,clock.h>
DECLARE_GLOBAL_DATA_PTR;
/* Primary oscillator */
#define SYS_POSC_CLK_HZ 24000000
/* FRC clk rate */
#define SYS_FRC_CLK_HZ 8000000
/* Clock Registers */
#define OSCCON 0x0000
#define OSCTUNE 0x0010
#define SPLLCON 0x0020
#define REFO1CON 0x0080
#define REFO1TRIM 0x0090
#define PB1DIV 0x0140
/* SPLL */
#define ICLK_MASK 0x00000080
#define PLLIDIV_MASK 0x00000007
#define PLLODIV_MASK 0x00000007
#define CUROSC_MASK 0x00000007
#define PLLMUL_MASK 0x0000007F
#define FRCDIV_MASK 0x00000007
/* PBCLK */
#define PBDIV_MASK 0x00000007
/* SYSCLK MUX */
#define SCLK_SRC_FRC1 0
#define SCLK_SRC_SPLL 1
#define SCLK_SRC_POSC 2
#define SCLK_SRC_FRC2 7
/* Reference Oscillator Control Reg fields */
#define REFO_SEL_MASK 0x0f
#define REFO_SEL_SHIFT 0
#define REFO_ACTIVE BIT(8)
#define REFO_DIVSW_EN BIT(9)
#define REFO_OE BIT(12)
#define REFO_ON BIT(15)
#define REFO_DIV_SHIFT 16
#define REFO_DIV_MASK 0x7fff
/* Reference Oscillator Trim Register Fields */
#define REFO_TRIM_REG 0x10
#define REFO_TRIM_MASK 0x1ff
#define REFO_TRIM_SHIFT 23
#define REFO_TRIM_MAX 511
#define ROCLK_SRC_SCLK 0x0
#define ROCLK_SRC_SPLL 0x7
#define ROCLK_SRC_ROCLKI 0x8
/* Memory PLL */
#define MPLL_IDIV 0x3f
#define MPLL_MULT 0xff
#define MPLL_ODIV1 0x7
#define MPLL_ODIV2 0x7
#define MPLL_VREG_RDY BIT(23)
#define MPLL_RDY BIT(31)
#define MPLL_IDIV_SHIFT 0
#define MPLL_MULT_SHIFT 8
#define MPLL_ODIV1_SHIFT 24
#define MPLL_ODIV2_SHIFT 27
#define MPLL_IDIV_INIT 0x03
#define MPLL_MULT_INIT 0x32
#define MPLL_ODIV1_INIT 0x02
#define MPLL_ODIV2_INIT 0x01
struct pic32_clk_priv {
void __iomem *iobase;
void __iomem *syscfg_base;
};
static ulong pic32_get_pll_rate(struct pic32_clk_priv *priv)
{
u32 iclk, idiv, odiv, mult;
ulong plliclk, v;
v = readl(priv->iobase + SPLLCON);
iclk = (v & ICLK_MASK);
idiv = ((v >> 8) & PLLIDIV_MASK) + 1;
odiv = ((v >> 24) & PLLODIV_MASK);
mult = ((v >> 16) & PLLMUL_MASK) + 1;
plliclk = iclk ? SYS_FRC_CLK_HZ : SYS_POSC_CLK_HZ;
if (odiv < 2)
odiv = 2;
else if (odiv < 5)
odiv = (1 << odiv);
else
odiv = 32;
return ((plliclk / idiv) * mult) / odiv;
}
static ulong pic32_get_sysclk(struct pic32_clk_priv *priv)
{
ulong v;
ulong hz;
ulong div, frcdiv;
ulong curr_osc;
/* get clk source */
v = readl(priv->iobase + OSCCON);
curr_osc = (v >> 12) & CUROSC_MASK;
switch (curr_osc) {
case SCLK_SRC_FRC1:
case SCLK_SRC_FRC2:
frcdiv = ((v >> 24) & FRCDIV_MASK);
div = ((1 << frcdiv) + 1) + (128 * (frcdiv == 7));
hz = SYS_FRC_CLK_HZ / div;
break;
case SCLK_SRC_SPLL:
hz = pic32_get_pll_rate(priv);
break;
case SCLK_SRC_POSC:
hz = SYS_POSC_CLK_HZ;
break;
default:
hz = 0;
printf("clk: unknown sclk_src.\n");
break;
}
return hz;
}
static ulong pic32_get_pbclk(struct pic32_clk_priv *priv, int periph)
{
void __iomem *reg;
ulong div, clk_freq;
WARN_ON((periph < PB1CLK) || (periph > PB7CLK));
clk_freq = pic32_get_sysclk(priv);
reg = priv->iobase + PB1DIV + (periph - PB1CLK) * 0x10;
div = (readl(reg) & PBDIV_MASK) + 1;
return clk_freq / div;
}
static ulong pic32_get_cpuclk(struct pic32_clk_priv *priv)
{
return pic32_get_pbclk(priv, PB7CLK);
}
static ulong pic32_set_refclk(struct pic32_clk_priv *priv, int periph,
int parent_rate, int rate, int parent_id)
{
void __iomem *reg;
u32 div, trim, v;
u64 frac;
WARN_ON((periph < REF1CLK) || (periph > REF5CLK));
/* calculate dividers,
* rate = parent_rate / [2 * (div + (trim / 512))]
*/
if (parent_rate <= rate) {
div = 0;
trim = 0;
} else {
div = parent_rate / (rate << 1);
frac = parent_rate;
frac <<= 8;
do_div(frac, rate);
frac -= (u64)(div << 9);
trim = (frac >= REFO_TRIM_MAX) ? REFO_TRIM_MAX : (u32)frac;
}
reg = priv->iobase + REFO1CON + (periph - REF1CLK) * 0x20;
/* disable clk */
writel(REFO_ON | REFO_OE, reg + _CLR_OFFSET);
/* wait till previous src change is active */
wait_for_bit(__func__, reg, REFO_DIVSW_EN | REFO_ACTIVE,
false, CONFIG_SYS_HZ, false);
/* parent_id */
v = readl(reg);
v &= ~(REFO_SEL_MASK << REFO_SEL_SHIFT);
v |= (parent_id << REFO_SEL_SHIFT);
/* apply rodiv */
v &= ~(REFO_DIV_MASK << REFO_DIV_SHIFT);
v |= (div << REFO_DIV_SHIFT);
writel(v, reg);
/* apply trim */
v = readl(reg + REFO_TRIM_REG);
v &= ~(REFO_TRIM_MASK << REFO_TRIM_SHIFT);
v |= (trim << REFO_TRIM_SHIFT);
writel(v, reg + REFO_TRIM_REG);
/* enable clk */
writel(REFO_ON | REFO_OE, reg + _SET_OFFSET);
/* switch divider */
writel(REFO_DIVSW_EN, reg + _SET_OFFSET);
/* wait for divider switching to complete */
return wait_for_bit(__func__, reg, REFO_DIVSW_EN, false,
CONFIG_SYS_HZ, false);
}
static ulong pic32_get_refclk(struct pic32_clk_priv *priv, int periph)
{
u32 rodiv, rotrim, rosel, v, parent_rate;
void __iomem *reg;
u64 rate64;
WARN_ON((periph < REF1CLK) || (periph > REF5CLK));
reg = priv->iobase + REFO1CON + (periph - REF1CLK) * 0x20;
v = readl(reg);
/* get rosel */
rosel = (v >> REFO_SEL_SHIFT) & REFO_SEL_MASK;
/* get div */
rodiv = (v >> REFO_DIV_SHIFT) & REFO_DIV_MASK;
/* get trim */
v = readl(reg + REFO_TRIM_REG);
rotrim = (v >> REFO_TRIM_SHIFT) & REFO_TRIM_MASK;
if (!rodiv)
return 0;
/* get parent rate */
switch (rosel) {
case ROCLK_SRC_SCLK:
parent_rate = pic32_get_cpuclk(priv);
break;
case ROCLK_SRC_SPLL:
parent_rate = pic32_get_pll_rate(priv);
break;
default:
parent_rate = 0;
break;
}
/* Calculation
* rate = parent_rate / [2 * (div + (trim / 512))]
*/
if (rotrim) {
rodiv <<= 9;
rodiv += rotrim;
rate64 = parent_rate;
rate64 <<= 8;
do_div(rate64, rodiv);
v = (u32)rate64;
} else {
v = parent_rate / (rodiv << 1);
}
return v;
}
static ulong pic32_get_mpll_rate(struct pic32_clk_priv *priv)
{
u32 v, idiv, mul;
u32 odiv1, odiv2;
u64 rate;
v = readl(priv->syscfg_base + CFGMPLL);
idiv = v & MPLL_IDIV;
mul = (v >> MPLL_MULT_SHIFT) & MPLL_MULT;
odiv1 = (v >> MPLL_ODIV1_SHIFT) & MPLL_ODIV1;
odiv2 = (v >> MPLL_ODIV2_SHIFT) & MPLL_ODIV2;
rate = (SYS_POSC_CLK_HZ / idiv) * mul;
do_div(rate, odiv1);
do_div(rate, odiv2);
return (ulong)rate;
}
static int pic32_mpll_init(struct pic32_clk_priv *priv)
{
u32 v, mask;
/* initialize */
v = (MPLL_IDIV_INIT << MPLL_IDIV_SHIFT) |
(MPLL_MULT_INIT << MPLL_MULT_SHIFT) |
(MPLL_ODIV1_INIT << MPLL_ODIV1_SHIFT) |
(MPLL_ODIV2_INIT << MPLL_ODIV2_SHIFT);
writel(v, priv->syscfg_base + CFGMPLL);
/* Wait for ready */
mask = MPLL_RDY | MPLL_VREG_RDY;
return wait_for_bit(__func__, priv->syscfg_base + CFGMPLL, mask,
true, get_tbclk(), false);
}
static void pic32_clk_init(struct udevice *dev)
{
const void *blob = gd->fdt_blob;
struct pic32_clk_priv *priv;
ulong rate, pll_hz;
char propname[50];
int i;
priv = dev_get_priv(dev);
pll_hz = pic32_get_pll_rate(priv);
/* Initialize REFOs as not initialized and enabled on reset. */
for (i = REF1CLK; i <= REF5CLK; i++) {
snprintf(propname, sizeof(propname),
"microchip,refo%d-frequency", i - REF1CLK + 1);
rate = fdtdec_get_int(blob, dev->of_offset, propname, 0);
if (rate)
pic32_set_refclk(priv, i, pll_hz, rate, ROCLK_SRC_SPLL);
}
/* Memory PLL */
pic32_mpll_init(priv);
}
static ulong pic32_get_rate(struct clk *clk)
{
struct pic32_clk_priv *priv = dev_get_priv(clk->dev);
ulong rate;
switch (clk->id) {
case PB1CLK ... PB7CLK:
rate = pic32_get_pbclk(priv, clk->id);
break;
case REF1CLK ... REF5CLK:
rate = pic32_get_refclk(priv, clk->id);
break;
case PLLCLK:
rate = pic32_get_pll_rate(priv);
break;
case MPLL:
rate = pic32_get_mpll_rate(priv);
break;
default:
rate = 0;
break;
}
return rate;
}
static ulong pic32_set_rate(struct clk *clk, ulong rate)
{
struct pic32_clk_priv *priv = dev_get_priv(clk->dev);
ulong pll_hz;
switch (clk->id) {
case REF1CLK ... REF5CLK:
pll_hz = pic32_get_pll_rate(priv);
pic32_set_refclk(priv, clk->id, pll_hz, rate, ROCLK_SRC_SPLL);
break;
default:
break;
}
return rate;
}
static struct clk_ops pic32_pic32_clk_ops = {
.set_rate = pic32_set_rate,
.get_rate = pic32_get_rate,
};
static int pic32_clk_probe(struct udevice *dev)
{
struct pic32_clk_priv *priv = dev_get_priv(dev);
fdt_addr_t addr;
fdt_size_t size;
addr = fdtdec_get_addr_size(gd->fdt_blob, dev->of_offset, "reg", &size);
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
priv->iobase = ioremap(addr, size);
if (!priv->iobase)
return -EINVAL;
priv->syscfg_base = pic32_get_syscfg_base();
/* initialize clocks */
pic32_clk_init(dev);
return 0;
}
static const struct udevice_id pic32_clk_ids[] = {
{ .compatible = "microchip,pic32mzda-clk"},
{}
};
U_BOOT_DRIVER(pic32_clk) = {
.name = "pic32_clk",
.id = UCLASS_CLK,
.of_match = pic32_clk_ids,
.flags = DM_FLAG_PRE_RELOC,
.ops = &pic32_pic32_clk_ops,
.probe = pic32_clk_probe,
.priv_auto_alloc_size = sizeof(struct pic32_clk_priv),
};
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