ARM: 6014/1: ST SPEAr: Added clock framework for SPEAr platform and machines

Clock framework for SPEAr is based upon clkdev framework for ARM

Reviewed-by: Linus Walleij <linux.walleij@stericsson.com>
Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

3 files changed, 408 insertions, 0 deletions

diff --git a/arch/arm/mach-spear3xx/clock.c b/arch/arm/mach-spear3xx/clock.c
new file mode 100644
index 000000000000..39f6ccf22294
--- /dev/null
+++ b/arch/arm/mach-spear3xx/clock.c
@@ -0,0 +1,389 @@
+/*
+ * arch/arm/mach-spear3xx/clock.c
+ *
+ * SPEAr3xx machines clock framework source file
+ *
+ * Copyright (C) 2009 ST Microelectronics
+ * Viresh Kumar<viresh.kumar@st.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/init.h>
+#include <linux/kernel.h>
+#include <mach/misc_regs.h>
+#include <plat/clock.h>
+
+/* root clks */
+/* 32 KHz oscillator clock */
+static struct clk osc_32k_clk = {
+        .flags = ALWAYS_ENABLED,
+        .rate = 32000,
+};
+
+/* 24 MHz oscillator clock */
+static struct clk osc_24m_clk = {
+        .flags = ALWAYS_ENABLED,
+        .rate = 24000000,
+};
+
+/* clock derived from 32 KHz osc clk */
+/* rtc clock */
+static struct clk rtc_clk = {
+        .pclk = &osc_32k_clk,
+        .en_reg = PERIP1_CLK_ENB,
+        .en_reg_bit = RTC_CLK_ENB,
+        .recalc = &follow_parent,
+};
+
+/* clock derived from 24 MHz osc clk */
+/* pll1 configuration structure */
+static struct pll_clk_config pll1_config = {
+        .mode_reg = PLL1_CTR,
+        .cfg_reg = PLL1_FRQ,
+};
+
+/* PLL1 clock */
+static struct clk pll1_clk = {
+        .pclk = &osc_24m_clk,
+        .en_reg = PLL1_CTR,
+        .en_reg_bit = PLL_ENABLE,
+        .recalc = &pll1_clk_recalc,
+        .private_data = &pll1_config,
+};
+
+/* PLL3 48 MHz clock */
+static struct clk pll3_48m_clk = {
+        .flags = ALWAYS_ENABLED,
+        .pclk = &osc_24m_clk,
+        .rate = 48000000,
+};
+
+/* watch dog timer clock */
+static struct clk wdt_clk = {
+        .flags = ALWAYS_ENABLED,
+        .pclk = &osc_24m_clk,
+        .recalc = &follow_parent,
+};
+
+/* clock derived from pll1 clk */
+/* cpu clock */
+static struct clk cpu_clk = {
+        .flags = ALWAYS_ENABLED,
+        .pclk = &pll1_clk,
+        .recalc = &follow_parent,
+};
+
+/* ahb configuration structure */
+static struct bus_clk_config ahb_config = {
+        .reg = CORE_CLK_CFG,
+        .mask = PLL_HCLK_RATIO_MASK,
+        .shift = PLL_HCLK_RATIO_SHIFT,
+};
+
+/* ahb clock */
+static struct clk ahb_clk = {
+        .flags = ALWAYS_ENABLED,
+        .pclk = &pll1_clk,
+        .recalc = &bus_clk_recalc,
+        .private_data = &ahb_config,
+};
+
+/* uart configurations */
+static struct aux_clk_config uart_config = {
+        .synth_reg = UART_CLK_SYNT,
+};
+
+/* uart parents */
+static struct pclk_info uart_pclk_info[] = {
+        {
+                .pclk = &pll1_clk,
+                .pclk_mask = AUX_CLK_PLL1_MASK,
+                .scalable = 1,
+        }, {
+                .pclk = &pll3_48m_clk,
+                .pclk_mask = AUX_CLK_PLL3_MASK,
+                .scalable = 0,
+        },
+};
+
+/* uart parent select structure */
+static struct pclk_sel uart_pclk_sel = {
+        .pclk_info = uart_pclk_info,
+        .pclk_count = ARRAY_SIZE(uart_pclk_info),
+        .pclk_sel_reg = PERIP_CLK_CFG,
+        .pclk_sel_mask = UART_CLK_MASK,
+};
+
+/* uart clock */
+static struct clk uart_clk = {
+        .en_reg = PERIP1_CLK_ENB,
+        .en_reg_bit = UART_CLK_ENB,
+        .pclk_sel = &uart_pclk_sel,
+        .pclk_sel_shift = UART_CLK_SHIFT,
+        .recalc = &aux_clk_recalc,
+        .private_data = &uart_config,
+};
+
+/* firda configurations */
+static struct aux_clk_config firda_config = {
+        .synth_reg = FIRDA_CLK_SYNT,
+};
+
+/* firda parents */
+static struct pclk_info firda_pclk_info[] = {
+        {
+                .pclk = &pll1_clk,
+                .pclk_mask = AUX_CLK_PLL1_MASK,
+                .scalable = 1,
+        }, {
+                .pclk = &pll3_48m_clk,
+                .pclk_mask = AUX_CLK_PLL3_MASK,
+                .scalable = 0,
+        },
+};
+
+/* firda parent select structure */
+static struct pclk_sel firda_pclk_sel = {
+        .pclk_info = firda_pclk_info,
+        .pclk_count = ARRAY_SIZE(firda_pclk_info),
+        .pclk_sel_reg = PERIP_CLK_CFG,
+        .pclk_sel_mask = FIRDA_CLK_MASK,
+};
+
+/* firda clock */
+static struct clk firda_clk = {
+        .en_reg = PERIP1_CLK_ENB,
+        .en_reg_bit = FIRDA_CLK_ENB,
+        .pclk_sel = &firda_pclk_sel,
+        .pclk_sel_shift = FIRDA_CLK_SHIFT,
+        .recalc = &aux_clk_recalc,
+        .private_data = &firda_config,
+};
+
+/* gpt parents */
+static struct pclk_info gpt_pclk_info[] = {
+        {
+                .pclk = &pll1_clk,
+                .pclk_mask = AUX_CLK_PLL1_MASK,
+                .scalable = 1,
+        }, {
+                .pclk = &pll3_48m_clk,
+                .pclk_mask = AUX_CLK_PLL3_MASK,
+                .scalable = 0,
+        },
+};
+
+/* gpt parent select structure */
+static struct pclk_sel gpt_pclk_sel = {
+        .pclk_info = gpt_pclk_info,
+        .pclk_count = ARRAY_SIZE(gpt_pclk_info),
+        .pclk_sel_reg = PERIP_CLK_CFG,
+        .pclk_sel_mask = GPT_CLK_MASK,
+};
+
+/* gpt0 configurations */
+static struct aux_clk_config gpt0_config = {
+        .synth_reg = PRSC1_CLK_CFG,
+};
+
+/* gpt0 timer clock */
+static struct clk gpt0_clk = {
+        .flags = ALWAYS_ENABLED,
+        .pclk_sel = &gpt_pclk_sel,
+        .pclk_sel_shift = GPT0_CLK_SHIFT,
+        .recalc = &gpt_clk_recalc,
+        .private_data = &gpt0_config,
+};
+
+/* gpt1 configurations */
+static struct aux_clk_config gpt1_config = {
+        .synth_reg = PRSC2_CLK_CFG,
+};
+
+/* gpt1 timer clock */
+static struct clk gpt1_clk = {
+        .en_reg = PERIP1_CLK_ENB,
+        .en_reg_bit = GPT1_CLK_ENB,
+        .pclk_sel = &gpt_pclk_sel,
+        .pclk_sel_shift = GPT1_CLK_SHIFT,
+        .recalc = &gpt_clk_recalc,
+        .private_data = &gpt1_config,
+};
+
+/* gpt2 configurations */
+static struct aux_clk_config gpt2_config = {
+        .synth_reg = PRSC3_CLK_CFG,
+};
+
+/* gpt2 timer clock */
+static struct clk gpt2_clk = {
+        .en_reg = PERIP1_CLK_ENB,
+        .en_reg_bit = GPT2_CLK_ENB,
+        .pclk_sel = &gpt_pclk_sel,
+        .pclk_sel_shift = GPT2_CLK_SHIFT,
+        .recalc = &gpt_clk_recalc,
+        .private_data = &gpt2_config,
+};
+
+/* clock derived from pll3 clk */
+/* usbh clock */
+static struct clk usbh_clk = {
+        .pclk = &pll3_48m_clk,
+        .en_reg = PERIP1_CLK_ENB,
+        .en_reg_bit = USBH_CLK_ENB,
+        .recalc = &follow_parent,
+};
+
+/* usbd clock */
+static struct clk usbd_clk = {
+        .pclk = &pll3_48m_clk,
+        .en_reg = PERIP1_CLK_ENB,
+        .en_reg_bit = USBD_CLK_ENB,
+        .recalc = &follow_parent,
+};
+
+/* clcd clock */
+static struct clk clcd_clk = {
+        .flags = ALWAYS_ENABLED,
+        .pclk = &pll3_48m_clk,
+        .recalc = &follow_parent,
+};
+
+/* clock derived from ahb clk */
+/* apb configuration structure */
+static struct bus_clk_config apb_config = {
+        .reg = CORE_CLK_CFG,
+        .mask = HCLK_PCLK_RATIO_MASK,
+        .shift = HCLK_PCLK_RATIO_SHIFT,
+};
+
+/* apb clock */
+static struct clk apb_clk = {
+        .flags = ALWAYS_ENABLED,
+        .pclk = &ahb_clk,
+        .recalc = &bus_clk_recalc,
+        .private_data = &apb_config,
+};
+
+/* i2c clock */
+static struct clk i2c_clk = {
+        .pclk = &ahb_clk,
+        .en_reg = PERIP1_CLK_ENB,
+        .en_reg_bit = I2C_CLK_ENB,
+        .recalc = &follow_parent,
+};
+
+/* dma clock */
+static struct clk dma_clk = {
+        .pclk = &ahb_clk,
+        .en_reg = PERIP1_CLK_ENB,
+        .en_reg_bit = DMA_CLK_ENB,
+        .recalc = &follow_parent,
+};
+
+/* jpeg clock */
+static struct clk jpeg_clk = {
+        .pclk = &ahb_clk,
+        .en_reg = PERIP1_CLK_ENB,
+        .en_reg_bit = JPEG_CLK_ENB,
+        .recalc = &follow_parent,
+};
+
+/* gmac clock */
+static struct clk gmac_clk = {
+        .pclk = &ahb_clk,
+        .en_reg = PERIP1_CLK_ENB,
+        .en_reg_bit = GMAC_CLK_ENB,
+        .recalc = &follow_parent,
+};
+
+/* smi clock */
+static struct clk smi_clk = {
+        .pclk = &ahb_clk,
+        .en_reg = PERIP1_CLK_ENB,
+        .en_reg_bit = SMI_CLK_ENB,
+        .recalc = &follow_parent,
+};
+
+/* c3 clock */
+static struct clk c3_clk = {
+        .pclk = &ahb_clk,
+        .en_reg = PERIP1_CLK_ENB,
+        .en_reg_bit = C3_CLK_ENB,
+        .recalc = &follow_parent,
+};
+
+/* clock derived from apb clk */
+/* adc clock */
+static struct clk adc_clk = {
+        .pclk = &apb_clk,
+        .en_reg = PERIP1_CLK_ENB,
+        .en_reg_bit = ADC_CLK_ENB,
+        .recalc = &follow_parent,
+};
+
+/* ssp clock */
+static struct clk ssp_clk = {
+        .pclk = &apb_clk,
+        .en_reg = PERIP1_CLK_ENB,
+        .en_reg_bit = SSP_CLK_ENB,
+        .recalc = &follow_parent,
+};
+
+/* gpio clock */
+static struct clk gpio_clk = {
+        .pclk = &apb_clk,
+        .en_reg = PERIP1_CLK_ENB,
+        .en_reg_bit = GPIO_CLK_ENB,
+        .recalc = &follow_parent,
+};
+
+/* array of all spear 3xx clock lookups */
+static struct clk_lookup spear_clk_lookups[] = {
+        /* root clks */
+        { .con_id = "osc_32k_clk",      .clk = &osc_32k_clk},
+        { .con_id = "osc_24m_clk",      .clk = &osc_24m_clk},
+        /* clock derived from 32 KHz osc clk */
+        { .dev_id = "rtc",              .clk = &rtc_clk},
+        /* clock derived from 24 MHz osc clk */
+        { .con_id = "pll1_clk",         .clk = &pll1_clk},
+        { .con_id = "pll3_48m_clk",     .clk = &pll3_48m_clk},
+        { .dev_id = "wdt",              .clk = &wdt_clk},
+        /* clock derived from pll1 clk */
+        { .con_id = "cpu_clk",          .clk = &cpu_clk},
+        { .con_id = "ahb_clk",          .clk = &ahb_clk},
+        { .dev_id = "uart",             .clk = &uart_clk},
+        { .dev_id = "firda",            .clk = &firda_clk},
+        { .dev_id = "gpt0",             .clk = &gpt0_clk},
+        { .dev_id = "gpt1",             .clk = &gpt1_clk},
+        { .dev_id = "gpt2",             .clk = &gpt2_clk},
+        /* clock derived from pll3 clk */
+        { .dev_id = "usbh",             .clk = &usbh_clk},
+        { .dev_id = "usbd",             .clk = &usbd_clk},
+        { .dev_id = "clcd",             .clk = &clcd_clk},
+        /* clock derived from ahb clk */
+        { .con_id = "apb_clk",          .clk = &apb_clk},
+        { .dev_id = "i2c",              .clk = &i2c_clk},
+        { .dev_id = "dma",              .clk = &dma_clk},
+        { .dev_id = "jpeg",             .clk = &jpeg_clk},
+        { .dev_id = "gmac",             .clk = &gmac_clk},
+        { .dev_id = "smi",              .clk = &smi_clk},
+        { .dev_id = "c3",               .clk = &c3_clk},
+        /* clock derived from apb clk */
+        { .dev_id = "adc",              .clk = &adc_clk},
+        { .dev_id = "ssp",              .clk = &ssp_clk},
+        { .dev_id = "gpio",             .clk = &gpio_clk},
+};
+
+void __init clk_init(void)
+{
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(spear_clk_lookups); i++)
+                clk_register(&spear_clk_lookups[i]);
+
+        recalc_root_clocks();
+}
diff --git a/arch/arm/mach-spear3xx/include/mach/clkdev.h b/arch/arm/mach-spear3xx/include/mach/clkdev.h
new file mode 100644
index 000000000000..a3d07339d9f1
--- /dev/null
+++ b/arch/arm/mach-spear3xx/include/mach/clkdev.h
@@ -0,0 +1,19 @@
+/*
+ * arch/arm/mach-spear3xx/include/mach/clkdev.h
+ *
+ * Clock Dev framework definitions for SPEAr3xx machine family
+ *
+ * Copyright (C) 2009 ST Microelectronics
+ * Viresh Kumar<viresh.kumar@st.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.
+ */
+
+#ifndef __MACH_CLKDEV_H
+#define __MACH_CLKDEV_H
+
+#include <plat/clkdev.h>
+
+#endif /* __MACH_CLKDEV_H */
diff --git a/arch/arm/mach-spear3xx/include/mach/misc_regs.h b/arch/arm/mach-spear3xx/include/mach/misc_regs.h
index 38d767a1aba0..38d767a1aba0 100755..100644
--- a/arch/arm/mach-spear3xx/include/mach/misc_regs.h
+++ b/arch/arm/mach-spear3xx/include/mach/misc_regs.h