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clk: add lpc18xx cgu clk driver

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Add driver for NXP LPC18xx/43xx Clock Generation Unit (CGU). The CGU
contains several clock generators and output stages that route the
clocks either directly to peripherals or to a Clock Control Unit
(CCU).

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
Signed-off-by: Michael Turquette <mturquette@baylibre.com>
This commit is contained in:
Joachim Eastwood 2015-05-28 22:31:43 +02:00 committed by Michael Turquette
parent 02fdfd708f
commit b04e0b8fd5
4 changed files with 678 additions and 0 deletions
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1
drivers/clk/Makefile
View file

@ -57,6 +57,7 @@ endif
obj-$(CONFIG_PLAT_ORION) += mvebu/
obj-$(CONFIG_ARCH_MESON) += meson/
obj-$(CONFIG_ARCH_MXS) += mxs/
obj-$(CONFIG_ARCH_LPC18XX) += nxp/
obj-$(CONFIG_MACH_PISTACHIO) += pistachio/
obj-$(CONFIG_COMMON_CLK_PXA) += pxa/
obj-$(CONFIG_COMMON_CLK_QCOM) += qcom/

1
drivers/clk/nxp/Makefile Normal file
View file

@ -0,0 +1 @@
obj-$(CONFIG_ARCH_LPC18XX) += clk-lpc18xx-cgu.o

635
drivers/clk/nxp/clk-lpc18xx-cgu.c Normal file
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@ -0,0 +1,635 @@
/*
* Clk driver for NXP LPC18xx/LPC43xx Clock Generation Unit (CGU)
*
* Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <dt-bindings/clock/lpc18xx-cgu.h>
/* Clock Generation Unit (CGU) registers */
#define LPC18XX_CGU_XTAL_OSC_CTRL 0x018
#define LPC18XX_CGU_PLL0USB_STAT 0x01c
#define LPC18XX_CGU_PLL0USB_CTRL 0x020
#define LPC18XX_CGU_PLL0USB_MDIV 0x024
#define LPC18XX_CGU_PLL0USB_NP_DIV 0x028
#define LPC18XX_CGU_PLL0AUDIO_STAT 0x02c
#define LPC18XX_CGU_PLL0AUDIO_CTRL 0x030
#define LPC18XX_CGU_PLL0AUDIO_MDIV 0x034
#define LPC18XX_CGU_PLL0AUDIO_NP_DIV 0x038
#define LPC18XX_CGU_PLL0AUDIO_FRAC 0x03c
#define LPC18XX_CGU_PLL1_STAT 0x040
#define LPC18XX_CGU_PLL1_CTRL 0x044
#define LPC18XX_PLL1_CTRL_FBSEL BIT(6)
#define LPC18XX_PLL1_CTRL_DIRECT BIT(7)
#define LPC18XX_CGU_IDIV_CTRL(n) (0x048 + (n) * sizeof(u32))
#define LPC18XX_CGU_BASE_CLK(id) (0x05c + (id) * sizeof(u32))
#define LPC18XX_CGU_PLL_CTRL_OFFSET 0x4
/* PLL0 bits common to both audio and USB PLL */
#define LPC18XX_PLL0_STAT_LOCK BIT(0)
#define LPC18XX_PLL0_CTRL_PD BIT(0)
#define LPC18XX_PLL0_CTRL_BYPASS BIT(1)
#define LPC18XX_PLL0_CTRL_DIRECTI BIT(2)
#define LPC18XX_PLL0_CTRL_DIRECTO BIT(3)
#define LPC18XX_PLL0_CTRL_CLKEN BIT(4)
#define LPC18XX_PLL0_MDIV_MDEC_MASK 0x1ffff
#define LPC18XX_PLL0_MDIV_SELP_SHIFT 17
#define LPC18XX_PLL0_MDIV_SELI_SHIFT 22
#define LPC18XX_PLL0_MSEL_MAX BIT(15)
/* Register value that gives PLL0 post/pre dividers equal to 1 */
#define LPC18XX_PLL0_NP_DIVS_1 0x00302062
enum {
CLK_SRC_OSC32,
CLK_SRC_IRC,
CLK_SRC_ENET_RX_CLK,
CLK_SRC_ENET_TX_CLK,
CLK_SRC_GP_CLKIN,
CLK_SRC_RESERVED1,
CLK_SRC_OSC,
CLK_SRC_PLL0USB,
CLK_SRC_PLL0AUDIO,
CLK_SRC_PLL1,
CLK_SRC_RESERVED2,
CLK_SRC_RESERVED3,
CLK_SRC_IDIVA,
CLK_SRC_IDIVB,
CLK_SRC_IDIVC,
CLK_SRC_IDIVD,
CLK_SRC_IDIVE,
CLK_SRC_MAX
};
static const char *clk_src_names[CLK_SRC_MAX] = {
[CLK_SRC_OSC32] = "osc32",
[CLK_SRC_IRC] = "irc",
[CLK_SRC_ENET_RX_CLK] = "enet_rx_clk",
[CLK_SRC_ENET_TX_CLK] = "enet_tx_clk",
[CLK_SRC_GP_CLKIN] = "gp_clkin",
[CLK_SRC_OSC] = "osc",
[CLK_SRC_PLL0USB] = "pll0usb",
[CLK_SRC_PLL0AUDIO] = "pll0audio",
[CLK_SRC_PLL1] = "pll1",
[CLK_SRC_IDIVA] = "idiva",
[CLK_SRC_IDIVB] = "idivb",
[CLK_SRC_IDIVC] = "idivc",
[CLK_SRC_IDIVD] = "idivd",
[CLK_SRC_IDIVE] = "idive",
};
static const char *clk_base_names[BASE_CLK_MAX] = {
[BASE_SAFE_CLK] = "base_safe_clk",
[BASE_USB0_CLK] = "base_usb0_clk",
[BASE_PERIPH_CLK] = "base_periph_clk",
[BASE_USB1_CLK] = "base_usb1_clk",
[BASE_CPU_CLK] = "base_cpu_clk",
[BASE_SPIFI_CLK] = "base_spifi_clk",
[BASE_SPI_CLK] = "base_spi_clk",
[BASE_PHY_RX_CLK] = "base_phy_rx_clk",
[BASE_PHY_TX_CLK] = "base_phy_tx_clk",
[BASE_APB1_CLK] = "base_apb1_clk",
[BASE_APB3_CLK] = "base_apb3_clk",
[BASE_LCD_CLK] = "base_lcd_clk",
[BASE_ADCHS_CLK] = "base_adchs_clk",
[BASE_SDIO_CLK] = "base_sdio_clk",
[BASE_SSP0_CLK] = "base_ssp0_clk",
[BASE_SSP1_CLK] = "base_ssp1_clk",
[BASE_UART0_CLK] = "base_uart0_clk",
[BASE_UART1_CLK] = "base_uart1_clk",
[BASE_UART2_CLK] = "base_uart2_clk",
[BASE_UART3_CLK] = "base_uart3_clk",
[BASE_OUT_CLK] = "base_out_clk",
[BASE_AUDIO_CLK] = "base_audio_clk",
[BASE_CGU_OUT0_CLK] = "base_cgu_out0_clk",
[BASE_CGU_OUT1_CLK] = "base_cgu_out1_clk",
};
static u32 lpc18xx_cgu_pll0_src_ids[] = {
CLK_SRC_OSC32, CLK_SRC_IRC, CLK_SRC_ENET_RX_CLK,
CLK_SRC_ENET_TX_CLK, CLK_SRC_GP_CLKIN, CLK_SRC_OSC,
CLK_SRC_PLL1, CLK_SRC_IDIVA, CLK_SRC_IDIVB, CLK_SRC_IDIVC,
CLK_SRC_IDIVD, CLK_SRC_IDIVE,
};
static u32 lpc18xx_cgu_pll1_src_ids[] = {
CLK_SRC_OSC32, CLK_SRC_IRC, CLK_SRC_ENET_RX_CLK,
CLK_SRC_ENET_TX_CLK, CLK_SRC_GP_CLKIN, CLK_SRC_OSC,
CLK_SRC_PLL0USB, CLK_SRC_PLL0AUDIO, CLK_SRC_IDIVA,
CLK_SRC_IDIVB, CLK_SRC_IDIVC, CLK_SRC_IDIVD, CLK_SRC_IDIVE,
};
static u32 lpc18xx_cgu_idiva_src_ids[] = {
CLK_SRC_OSC32, CLK_SRC_IRC, CLK_SRC_ENET_RX_CLK,
CLK_SRC_ENET_TX_CLK, CLK_SRC_GP_CLKIN, CLK_SRC_OSC,
CLK_SRC_PLL0USB, CLK_SRC_PLL0AUDIO, CLK_SRC_PLL1
};
static u32 lpc18xx_cgu_idivbcde_src_ids[] = {
CLK_SRC_OSC32, CLK_SRC_IRC, CLK_SRC_ENET_RX_CLK,
CLK_SRC_ENET_TX_CLK, CLK_SRC_GP_CLKIN, CLK_SRC_OSC,
CLK_SRC_PLL0AUDIO, CLK_SRC_PLL1, CLK_SRC_IDIVA,
};
static u32 lpc18xx_cgu_base_irc_src_ids[] = {CLK_SRC_IRC};
static u32 lpc18xx_cgu_base_usb0_src_ids[] = {CLK_SRC_PLL0USB};
static u32 lpc18xx_cgu_base_common_src_ids[] = {
CLK_SRC_OSC32, CLK_SRC_IRC, CLK_SRC_ENET_RX_CLK,
CLK_SRC_ENET_TX_CLK, CLK_SRC_GP_CLKIN, CLK_SRC_OSC,
CLK_SRC_PLL0AUDIO, CLK_SRC_PLL1, CLK_SRC_IDIVA,
CLK_SRC_IDIVB, CLK_SRC_IDIVC, CLK_SRC_IDIVD, CLK_SRC_IDIVE,
};
static u32 lpc18xx_cgu_base_all_src_ids[] = {
CLK_SRC_OSC32, CLK_SRC_IRC, CLK_SRC_ENET_RX_CLK,
CLK_SRC_ENET_TX_CLK, CLK_SRC_GP_CLKIN, CLK_SRC_OSC,
CLK_SRC_PLL0USB, CLK_SRC_PLL0AUDIO, CLK_SRC_PLL1,
CLK_SRC_IDIVA, CLK_SRC_IDIVB, CLK_SRC_IDIVC,
CLK_SRC_IDIVD, CLK_SRC_IDIVE,
};
struct lpc18xx_cgu_src_clk_div {
u8 clk_id;
u8 n_parents;
struct clk_divider div;
struct clk_mux mux;
struct clk_gate gate;
};
#define LPC1XX_CGU_SRC_CLK_DIV(_id, _width, _table) \
{ \
.clk_id = CLK_SRC_ ##_id, \
.n_parents = ARRAY_SIZE(lpc18xx_cgu_ ##_table), \
.div = { \
.shift = 2, \
.width = _width, \
}, \
.mux = { \
.mask = 0x1f, \
.shift = 24, \
.table = lpc18xx_cgu_ ##_table, \
}, \
.gate = { \
.bit_idx = 0, \
.flags = CLK_GATE_SET_TO_DISABLE, \
}, \
}
static struct lpc18xx_cgu_src_clk_div lpc18xx_cgu_src_clk_divs[] = {
LPC1XX_CGU_SRC_CLK_DIV(IDIVA, 2, idiva_src_ids),
LPC1XX_CGU_SRC_CLK_DIV(IDIVB, 4, idivbcde_src_ids),
LPC1XX_CGU_SRC_CLK_DIV(IDIVC, 4, idivbcde_src_ids),
LPC1XX_CGU_SRC_CLK_DIV(IDIVD, 4, idivbcde_src_ids),
LPC1XX_CGU_SRC_CLK_DIV(IDIVE, 8, idivbcde_src_ids),
};
struct lpc18xx_cgu_base_clk {
u8 clk_id;
u8 n_parents;
struct clk_mux mux;
struct clk_gate gate;
};
#define LPC1XX_CGU_BASE_CLK(_id, _table, _flags) \
{ \
.clk_id = BASE_ ##_id ##_CLK, \
.n_parents = ARRAY_SIZE(lpc18xx_cgu_ ##_table), \
.mux = { \
.mask = 0x1f, \
.shift = 24, \
.table = lpc18xx_cgu_ ##_table, \
.flags = _flags, \
}, \
.gate = { \
.bit_idx = 0, \
.flags = CLK_GATE_SET_TO_DISABLE, \
}, \
}
static struct lpc18xx_cgu_base_clk lpc18xx_cgu_base_clks[] = {
LPC1XX_CGU_BASE_CLK(SAFE, base_irc_src_ids, CLK_MUX_READ_ONLY),
LPC1XX_CGU_BASE_CLK(USB0, base_usb0_src_ids, 0),
LPC1XX_CGU_BASE_CLK(PERIPH, base_common_src_ids, 0),
LPC1XX_CGU_BASE_CLK(USB1, base_all_src_ids, 0),
LPC1XX_CGU_BASE_CLK(CPU, base_common_src_ids, 0),
LPC1XX_CGU_BASE_CLK(SPIFI, base_common_src_ids, 0),
LPC1XX_CGU_BASE_CLK(SPI, base_common_src_ids, 0),
LPC1XX_CGU_BASE_CLK(PHY_RX, base_common_src_ids, 0),
LPC1XX_CGU_BASE_CLK(PHY_TX, base_common_src_ids, 0),
LPC1XX_CGU_BASE_CLK(APB1, base_common_src_ids, 0),
LPC1XX_CGU_BASE_CLK(APB3, base_common_src_ids, 0),
LPC1XX_CGU_BASE_CLK(LCD, base_common_src_ids, 0),
LPC1XX_CGU_BASE_CLK(ADCHS, base_common_src_ids, 0),
LPC1XX_CGU_BASE_CLK(SDIO, base_common_src_ids, 0),
LPC1XX_CGU_BASE_CLK(SSP0, base_common_src_ids, 0),
LPC1XX_CGU_BASE_CLK(SSP1, base_common_src_ids, 0),
LPC1XX_CGU_BASE_CLK(UART0, base_common_src_ids, 0),
LPC1XX_CGU_BASE_CLK(UART1, base_common_src_ids, 0),
LPC1XX_CGU_BASE_CLK(UART2, base_common_src_ids, 0),
LPC1XX_CGU_BASE_CLK(UART3, base_common_src_ids, 0),
LPC1XX_CGU_BASE_CLK(OUT, base_all_src_ids, 0),
{ /* 21 reserved */ },
{ /* 22 reserved */ },
{ /* 23 reserved */ },
{ /* 24 reserved */ },
LPC1XX_CGU_BASE_CLK(AUDIO, base_common_src_ids, 0),
LPC1XX_CGU_BASE_CLK(CGU_OUT0, base_all_src_ids, 0),
LPC1XX_CGU_BASE_CLK(CGU_OUT1, base_all_src_ids, 0),
};
struct lpc18xx_pll {
struct clk_hw hw;
void __iomem *reg;
spinlock_t *lock;
u8 flags;
};
#define to_lpc_pll(hw) container_of(hw, struct lpc18xx_pll, hw)
struct lpc18xx_cgu_pll_clk {
u8 clk_id;
u8 n_parents;
u8 reg_offset;
struct clk_mux mux;
struct clk_gate gate;
struct lpc18xx_pll pll;
const struct clk_ops *pll_ops;
};
#define LPC1XX_CGU_CLK_PLL(_id, _table, _pll_ops) \
{ \
.clk_id = CLK_SRC_ ##_id, \
.n_parents = ARRAY_SIZE(lpc18xx_cgu_ ##_table), \
.reg_offset = LPC18XX_CGU_ ##_id ##_STAT, \
.mux = { \
.mask = 0x1f, \
.shift = 24, \
.table = lpc18xx_cgu_ ##_table, \
}, \
.gate = { \
.bit_idx = 0, \
.flags = CLK_GATE_SET_TO_DISABLE, \
}, \
.pll_ops = &lpc18xx_ ##_pll_ops, \
}
/*
* PLL0 uses a special register value encoding. The compute functions below
* are taken or derived from the LPC1850 user manual (section 12.6.3.3).
*/
/* Compute PLL0 multiplier from decoded version */
static u32 lpc18xx_pll0_mdec2msel(u32 x)
{
int i;
switch (x) {
case 0x18003: return 1;
case 0x10003: return 2;
default:
for (i = LPC18XX_PLL0_MSEL_MAX + 1; x != 0x4000 && i > 0; i--)
x = ((x ^ x >> 14) & 1) | (x << 1 & 0x7fff);
return i;
}
}
/* Compute PLL0 decoded multiplier from binary version */
static u32 lpc18xx_pll0_msel2mdec(u32 msel)
{
u32 i, x = 0x4000;
switch (msel) {
case 0: return 0;
case 1: return 0x18003;
case 2: return 0x10003;
default:
for (i = msel; i <= LPC18XX_PLL0_MSEL_MAX; i++)
x = ((x ^ x >> 1) & 1) << 14 | (x >> 1 & 0xffff);
return x;
}
}
/* Compute PLL0 bandwidth SELI reg from multiplier */
static u32 lpc18xx_pll0_msel2seli(u32 msel)
{
u32 tmp;
if (msel > 16384) return 1;
if (msel > 8192) return 2;
if (msel > 2048) return 4;
if (msel >= 501) return 8;
if (msel >= 60) {
tmp = 1024 / (msel + 9);
return ((1024 == (tmp * (msel + 9))) == 0) ? tmp * 4 : (tmp + 1) * 4;
}
return (msel & 0x3c) + 4;
}
/* Compute PLL0 bandwidth SELP reg from multiplier */
static u32 lpc18xx_pll0_msel2selp(u32 msel)
{
if (msel < 60)
return (msel >> 1) + 1;
return 31;
}
static unsigned long lpc18xx_pll0_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct lpc18xx_pll *pll = to_lpc_pll(hw);
u32 ctrl, mdiv, msel, npdiv;
ctrl = clk_readl(pll->reg + LPC18XX_CGU_PLL0USB_CTRL);
mdiv = clk_readl(pll->reg + LPC18XX_CGU_PLL0USB_MDIV);
npdiv = clk_readl(pll->reg + LPC18XX_CGU_PLL0USB_NP_DIV);
if (ctrl & LPC18XX_PLL0_CTRL_BYPASS)
return parent_rate;
if (npdiv != LPC18XX_PLL0_NP_DIVS_1) {
pr_warn("%s: pre/post dividers not supported\n", __func__);
return 0;
}
msel = lpc18xx_pll0_mdec2msel(mdiv & LPC18XX_PLL0_MDIV_MDEC_MASK);
if (msel)
return 2 * msel * parent_rate;
pr_warn("%s: unable to calculate rate\n", __func__);
return 0;
}
static long lpc18xx_pll0_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *prate)
{
unsigned long m;
if (*prate < rate) {
pr_warn("%s: pll dividers not supported\n", __func__);
return -EINVAL;
}
m = DIV_ROUND_UP_ULL(*prate, rate * 2);
if (m <= 0 && m > LPC18XX_PLL0_MSEL_MAX) {
pr_warn("%s: unable to support rate %lu\n", __func__, rate);
return -EINVAL;
}
return 2 * *prate * m;
}
static int lpc18xx_pll0_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct lpc18xx_pll *pll = to_lpc_pll(hw);
u32 ctrl, stat, m;
int retry = 3;
if (parent_rate < rate) {
pr_warn("%s: pll dividers not supported\n", __func__);
return -EINVAL;
}
m = DIV_ROUND_UP_ULL(parent_rate, rate * 2);
if (m <= 0 && m > LPC18XX_PLL0_MSEL_MAX) {
pr_warn("%s: unable to support rate %lu\n", __func__, rate);
return -EINVAL;
}
m = lpc18xx_pll0_msel2mdec(m);
m |= lpc18xx_pll0_msel2selp(m) << LPC18XX_PLL0_MDIV_SELP_SHIFT;
m |= lpc18xx_pll0_msel2seli(m) << LPC18XX_PLL0_MDIV_SELI_SHIFT;
/* Power down PLL, disable clk output and dividers */
ctrl = clk_readl(pll->reg + LPC18XX_CGU_PLL0USB_CTRL);
ctrl |= LPC18XX_PLL0_CTRL_PD;
ctrl &= ~(LPC18XX_PLL0_CTRL_BYPASS | LPC18XX_PLL0_CTRL_DIRECTI |
LPC18XX_PLL0_CTRL_DIRECTO | LPC18XX_PLL0_CTRL_CLKEN);
clk_writel(ctrl, pll->reg + LPC18XX_CGU_PLL0USB_CTRL);
/* Configure new PLL settings */
clk_writel(m, pll->reg + LPC18XX_CGU_PLL0USB_MDIV);
clk_writel(LPC18XX_PLL0_NP_DIVS_1, pll->reg + LPC18XX_CGU_PLL0USB_NP_DIV);
/* Power up PLL and wait for lock */
ctrl &= ~LPC18XX_PLL0_CTRL_PD;
clk_writel(ctrl, pll->reg + LPC18XX_CGU_PLL0USB_CTRL);
do {
udelay(10);
stat = clk_readl(pll->reg + LPC18XX_CGU_PLL0USB_STAT);
if (stat & LPC18XX_PLL0_STAT_LOCK) {
ctrl |= LPC18XX_PLL0_CTRL_CLKEN;
clk_writel(ctrl, pll->reg + LPC18XX_CGU_PLL0USB_CTRL);
return 0;
}
} while (retry--);
pr_warn("%s: unable to lock pll\n", __func__);
return -EINVAL;
}
static const struct clk_ops lpc18xx_pll0_ops = {
.recalc_rate = lpc18xx_pll0_recalc_rate,
.round_rate = lpc18xx_pll0_round_rate,
.set_rate = lpc18xx_pll0_set_rate,
};
static unsigned long lpc18xx_pll1_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct lpc18xx_pll *pll = to_lpc_pll(hw);
u16 msel, nsel, psel;
bool direct, fbsel;
u32 stat, ctrl;
stat = clk_readl(pll->reg + LPC18XX_CGU_PLL1_STAT);
ctrl = clk_readl(pll->reg + LPC18XX_CGU_PLL1_CTRL);
direct = (ctrl & LPC18XX_PLL1_CTRL_DIRECT) ? true : false;
fbsel = (ctrl & LPC18XX_PLL1_CTRL_FBSEL) ? true : false;
msel = ((ctrl >> 16) & 0xff) + 1;
nsel = ((ctrl >> 12) & 0x3) + 1;
if (direct || fbsel)
return msel * (parent_rate / nsel);
psel = (ctrl >> 8) & 0x3;
psel = 1 << psel;
return (msel / (2 * psel)) * (parent_rate / nsel);
}
static const struct clk_ops lpc18xx_pll1_ops = {
.recalc_rate = lpc18xx_pll1_recalc_rate,
};
static struct lpc18xx_cgu_pll_clk lpc18xx_cgu_src_clk_plls[] = {
LPC1XX_CGU_CLK_PLL(PLL0USB, pll0_src_ids, pll0_ops),
LPC1XX_CGU_CLK_PLL(PLL0AUDIO, pll0_src_ids, pll0_ops),
LPC1XX_CGU_CLK_PLL(PLL1, pll1_src_ids, pll1_ops),
};
static void lpc18xx_fill_parent_names(const char **parent, u32 *id, int size)
{
int i;
for (i = 0; i < size; i++)
parent[i] = clk_src_names[id[i]];
}
static struct clk *lpc18xx_cgu_register_div(struct lpc18xx_cgu_src_clk_div *clk,
void __iomem *base, int n)
{
void __iomem *reg = base + LPC18XX_CGU_IDIV_CTRL(n);
const char *name = clk_src_names[clk->clk_id];
const char *parents[CLK_SRC_MAX];
clk->div.reg = reg;
clk->mux.reg = reg;
clk->gate.reg = reg;
lpc18xx_fill_parent_names(parents, clk->mux.table, clk->n_parents);
return clk_register_composite(NULL, name, parents, clk->n_parents,
&clk->mux.hw, &clk_mux_ops,
&clk->div.hw, &clk_divider_ops,
&clk->gate.hw, &clk_gate_ops, 0);
}
static struct clk *lpc18xx_register_base_clk(struct lpc18xx_cgu_base_clk *clk,
void __iomem *reg_base, int n)
{
void __iomem *reg = reg_base + LPC18XX_CGU_BASE_CLK(n);
const char *name = clk_base_names[clk->clk_id];
const char *parents[CLK_SRC_MAX];
if (clk->n_parents == 0)
return ERR_PTR(-ENOENT);
clk->mux.reg = reg;
clk->gate.reg = reg;
lpc18xx_fill_parent_names(parents, clk->mux.table, clk->n_parents);
/* SAFE_CLK can not be turned off */
if (n == BASE_SAFE_CLK)
return clk_register_composite(NULL, name, parents, clk->n_parents,
&clk->mux.hw, &clk_mux_ops,
NULL, NULL, NULL, NULL, 0);
return clk_register_composite(NULL, name, parents, clk->n_parents,
&clk->mux.hw, &clk_mux_ops,
NULL, NULL,
&clk->gate.hw, &clk_gate_ops, 0);
}
static struct clk *lpc18xx_cgu_register_pll(struct lpc18xx_cgu_pll_clk *clk,
void __iomem *base)
{
const char *name = clk_src_names[clk->clk_id];
const char *parents[CLK_SRC_MAX];
clk->pll.reg = base;
clk->mux.reg = base + clk->reg_offset + LPC18XX_CGU_PLL_CTRL_OFFSET;
clk->gate.reg = base + clk->reg_offset + LPC18XX_CGU_PLL_CTRL_OFFSET;
lpc18xx_fill_parent_names(parents, clk->mux.table, clk->n_parents);
return clk_register_composite(NULL, name, parents, clk->n_parents,
&clk->mux.hw, &clk_mux_ops,
&clk->pll.hw, clk->pll_ops,
&clk->gate.hw, &clk_gate_ops, 0);
}
static void __init lpc18xx_cgu_register_source_clks(struct device_node *np,
void __iomem *base)
{
const char *parents[CLK_SRC_MAX];
struct clk *clk;
int i;
/* Register the internal 12 MHz RC oscillator (IRC) */
clk = clk_register_fixed_rate(NULL, clk_src_names[CLK_SRC_IRC],
NULL, CLK_IS_ROOT, 12000000);
if (IS_ERR(clk))
pr_warn("%s: failed to register irc clk\n", __func__);
/* Register crystal oscillator controlller */
parents[0] = of_clk_get_parent_name(np, 0);
clk = clk_register_gate(NULL, clk_src_names[CLK_SRC_OSC], parents[0],
0, base + LPC18XX_CGU_XTAL_OSC_CTRL,
0, CLK_GATE_SET_TO_DISABLE, NULL);
if (IS_ERR(clk))
pr_warn("%s: failed to register osc clk\n", __func__);
/* Register all PLLs */
for (i = 0; i < ARRAY_SIZE(lpc18xx_cgu_src_clk_plls); i++) {
clk = lpc18xx_cgu_register_pll(&lpc18xx_cgu_src_clk_plls[i],
base);
if (IS_ERR(clk))
pr_warn("%s: failed to register pll (%d)\n", __func__, i);
}
/* Register all clock dividers A-E */
for (i = 0; i < ARRAY_SIZE(lpc18xx_cgu_src_clk_divs); i++) {
clk = lpc18xx_cgu_register_div(&lpc18xx_cgu_src_clk_divs[i],
base, i);
if (IS_ERR(clk))
pr_warn("%s: failed to register div %d\n", __func__, i);
}
}
static struct clk *clk_base[BASE_CLK_MAX];
static struct clk_onecell_data clk_base_data = {
.clks = clk_base,
.clk_num = BASE_CLK_MAX,
};
static void __init lpc18xx_cgu_register_base_clks(void __iomem *reg_base)
{
int i;
for (i = BASE_SAFE_CLK; i < BASE_CLK_MAX; i++) {
clk_base[i] = lpc18xx_register_base_clk(&lpc18xx_cgu_base_clks[i],
reg_base, i);
if (IS_ERR(clk_base[i]) && PTR_ERR(clk_base[i]) != -ENOENT)
pr_warn("%s: register base clk %d failed\n", __func__, i);
}
}
static void __init lpc18xx_cgu_init(struct device_node *np)
{
void __iomem *reg_base;
reg_base = of_iomap(np, 0);
if (!reg_base) {
pr_warn("%s: failed to map address range\n", __func__);
return;
}
lpc18xx_cgu_register_source_clks(np, reg_base);
lpc18xx_cgu_register_base_clks(reg_base);
of_clk_add_provider(np, of_clk_src_onecell_get, &clk_base_data);
}
CLK_OF_DECLARE(lpc18xx_cgu, "nxp,lpc1850-cgu", lpc18xx_cgu_init);

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include/dt-bindings/clock/lpc18xx-cgu.h Normal file
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/*
* Copyright (c) 2015 Joachim Eastwood <manabian@gmail.com>
*
* This code is released using a dual license strategy: BSD/GPL
* You can choose the licence that better fits your requirements.
*
* Released under the terms of 3-clause BSD License
* Released under the terms of GNU General Public License Version 2.0
*
*/
/* LPC18xx/43xx base clock ids */
#define BASE_SAFE_CLK 0
#define BASE_USB0_CLK 1
#define BASE_PERIPH_CLK 2
#define BASE_USB1_CLK 3
#define BASE_CPU_CLK 4
#define BASE_SPIFI_CLK 5
#define BASE_SPI_CLK 6
#define BASE_PHY_RX_CLK 7
#define BASE_PHY_TX_CLK 8
#define BASE_APB1_CLK 9
#define BASE_APB3_CLK 10
#define BASE_LCD_CLK 11
#define BASE_ADCHS_CLK 12
#define BASE_SDIO_CLK 13
#define BASE_SSP0_CLK 14
#define BASE_SSP1_CLK 15
#define BASE_UART0_CLK 16
#define BASE_UART1_CLK 17
#define BASE_UART2_CLK 18
#define BASE_UART3_CLK 19
#define BASE_OUT_CLK 20
#define BASE_RES1_CLK 21
#define BASE_RES2_CLK 22
#define BASE_RES3_CLK 23
#define BASE_RES4_CLK 24
#define BASE_AUDIO_CLK 25
#define BASE_CGU_OUT0_CLK 26
#define BASE_CGU_OUT1_CLK 27
#define BASE_CLK_MAX (BASE_CGU_OUT1_CLK + 1)