summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
Diffstat
-rw-r--r--drivers/clk/Makefile1
-rw-r--r--drivers/clk/nxp/Makefile1
-rw-r--r--drivers/clk/nxp/clk-lpc18xx-cgu.c635
-rw-r--r--include/dt-bindings/clock/lpc18xx-cgu.h41
4 files changed, 678 insertions, 0 deletions
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index d4bc8ed..256977e 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -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-$(CONFIG_COMMON_CLK_QCOM) += qcom/
diff --git a/drivers/clk/nxp/Makefile b/drivers/clk/nxp/Makefile
new file mode 100644
index 0000000..aca9d3e
--- /dev/null
+++ b/drivers/clk/nxp/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_ARCH_LPC18XX) += clk-lpc18xx-cgu.o
diff --git a/drivers/clk/nxp/clk-lpc18xx-cgu.c b/drivers/clk/nxp/clk-lpc18xx-cgu.c
new file mode 100644
index 0000000..81e9e1c
--- /dev/null
+++ b/drivers/clk/nxp/clk-lpc18xx-cgu.c
@@ -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);
diff --git a/include/dt-bindings/clock/lpc18xx-cgu.h b/include/dt-bindings/clock/lpc18xx-cgu.h
new file mode 100644
index 0000000..6e57c6d
--- /dev/null
+++ b/include/dt-bindings/clock/lpc18xx-cgu.h
@@ -0,0 +1,41 @@
+/*
+ * 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)
OpenPOWER on IntegriCloud