clk: add pxa27x clock drivers

Move pxa27x clock drivers from arch/arm/mach-pxa to driver/clk.
In the move :
 - convert to new clock framework legacy clocks
 - provide clocks as before for platform data based boards
 - provide clocks through devicetree

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

1 files changed, 370 insertions, 0 deletions

diff --git a/drivers/clk/pxa/clk-pxa27x.c b/drivers/clk/pxa/clk-pxa27x.c
new file mode 100644
index 000000000000..b345cc791e5d
--- /dev/null
+++ b/drivers/clk/pxa/clk-pxa27x.c
@@ -0,0 +1,370 @@
+/*
+ * Marvell PXA27x family clocks
+ *
+ * Copyright (C) 2014 Robert Jarzmik
+ *
+ * Heavily inspired from former arch/arm/mach-pxa/clock.c.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ */
+#include <linux/clk-provider.h>
+#include <mach/pxa2xx-regs.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/of.h>
+
+#include <dt-bindings/clock/pxa-clock.h>
+#include "clk-pxa.h"
+
+#define KHz 1000
+#define MHz (1000 * 1000)
+
+enum {
+        PXA_CORE_13Mhz = 0,
+        PXA_CORE_RUN,
+        PXA_CORE_TURBO,
+};
+
+enum {
+        PXA_BUS_13Mhz = 0,
+        PXA_BUS_RUN,
+};
+
+enum {
+        PXA_LCD_13Mhz = 0,
+        PXA_LCD_RUN,
+};
+
+enum {
+        PXA_MEM_13Mhz = 0,
+        PXA_MEM_SYSTEM_BUS,
+        PXA_MEM_RUN,
+};
+
+static const char * const get_freq_khz[] = {
+        "core", "run", "cpll", "memory",
+        "system_bus"
+};
+
+/*
+ * Get the clock frequency as reflected by CCSR and the turbo flag.
+ * We assume these values have been applied via a fcs.
+ * If info is not 0 we also display the current settings.
+ */
+unsigned int pxa27x_get_clk_frequency_khz(int info)
+{
+        struct clk *clk;
+        unsigned long clks[5];
+        int i;
+
+        for (i = 0; i < 5; i++) {
+                clk = clk_get(NULL, get_freq_khz[i]);
+                if (IS_ERR(clk)) {
+                        clks[i] = 0;
+                } else {
+                        clks[i] = clk_get_rate(clk);
+                        clk_put(clk);
+                }
+        }
+        if (info) {
+                pr_info("Run Mode clock: %ld.%02ldMHz\n",
+                        clks[1] / 1000000, (clks[1] % 1000000) / 10000);
+                pr_info("Turbo Mode clock: %ld.%02ldMHz\n",
+                        clks[2] / 1000000, (clks[2] % 1000000) / 10000);
+                pr_info("Memory clock: %ld.%02ldMHz\n",
+                        clks[3] / 1000000, (clks[3] % 1000000) / 10000);
+                pr_info("System bus clock: %ld.%02ldMHz\n",
+                        clks[4] / 1000000, (clks[4] % 1000000) / 10000);
+        }
+        return (unsigned int)clks[0];
+}
+
+bool pxa27x_is_ppll_disabled(void)
+{
+        unsigned long ccsr = CCSR;
+
+        return ccsr & (1 << CCCR_PPDIS_BIT);
+}
+
+#define PXA27X_CKEN(dev_id, con_id, parents, mult_hp, div_hp,           \
+                    bit, is_lp, flags)                                  \
+        PXA_CKEN(dev_id, con_id, bit, parents, 1, 1, mult_hp, div_hp,   \
+                 is_lp,  &CKEN, CKEN_ ## bit, flags)
+#define PXA27X_PBUS_CKEN(dev_id, con_id, bit, mult_hp, div_hp, delay)   \
+        PXA27X_CKEN(dev_id, con_id, pxa27x_pbus_parents, mult_hp,       \
+                    div_hp, bit, pxa27x_is_ppll_disabled, 0)
+
+PARENTS(pxa27x_pbus) = { "osc_13mhz", "ppll_312mhz" };
+PARENTS(pxa27x_sbus) = { "system_bus", "system_bus" };
+PARENTS(pxa27x_32Mhz_bus) = { "osc_32_768khz", "osc_32_768khz" };
+PARENTS(pxa27x_lcd_bus) = { "lcd_base", "lcd_base" };
+PARENTS(pxa27x_membus) = { "lcd_base", "lcd_base" };
+
+#define PXA27X_CKEN_1RATE(dev_id, con_id, bit, parents, delay)          \
+        PXA_CKEN_1RATE(dev_id, con_id, bit, parents,                    \
+                       &CKEN, CKEN_ ## bit, 0)
+#define PXA27X_CKEN_1RATE_AO(dev_id, con_id, bit, parents, delay)       \
+        PXA_CKEN_1RATE(dev_id, con_id, bit, parents,                    \
+                       &CKEN, CKEN_ ## bit, CLK_IGNORE_UNUSED)
+
+static struct pxa_clk_cken pxa27x_clocks[] = {
+        PXA27X_PBUS_CKEN("pxa2xx-uart.0", NULL, FFUART, 2, 42, 1),
+        PXA27X_PBUS_CKEN("pxa2xx-uart.1", NULL, BTUART, 2, 42, 1),
+        PXA27X_PBUS_CKEN("pxa2xx-uart.2", NULL, STUART, 2, 42, 1),
+        PXA27X_PBUS_CKEN("pxa2xx-i2s", NULL, I2S, 2, 51, 0),
+        PXA27X_PBUS_CKEN("pxa2xx-i2c.0", NULL, I2C, 2, 19, 0),
+        PXA27X_PBUS_CKEN("pxa27x-udc", NULL, USB, 2, 13, 5),
+        PXA27X_PBUS_CKEN("pxa2xx-mci.0", NULL, MMC, 2, 32, 0),
+        PXA27X_PBUS_CKEN("pxa2xx-ir", "FICPCLK", FICP, 2, 13, 0),
+        PXA27X_PBUS_CKEN("pxa27x-ohci", NULL, USBHOST, 2, 13, 0),
+        PXA27X_PBUS_CKEN("pxa2xx-i2c.1", NULL, PWRI2C, 1, 24, 0),
+        PXA27X_PBUS_CKEN("pxa27x-ssp.0", NULL, SSP1, 1, 24, 0),
+        PXA27X_PBUS_CKEN("pxa27x-ssp.1", NULL, SSP2, 1, 24, 0),
+        PXA27X_PBUS_CKEN("pxa27x-ssp.2", NULL, SSP3, 1, 24, 0),
+        PXA27X_PBUS_CKEN("pxa27x-pwm.0", NULL, PWM0, 1, 24, 0),
+        PXA27X_PBUS_CKEN("pxa27x-pwm.1", NULL, PWM1, 1, 24, 0),
+        PXA27X_PBUS_CKEN(NULL, "MSLCLK", MSL, 2, 13, 0),
+        PXA27X_PBUS_CKEN(NULL, "USIMCLK", USIM, 2, 13, 0),
+        PXA27X_PBUS_CKEN(NULL, "MSTKCLK", MEMSTK, 2, 32, 0),
+        PXA27X_PBUS_CKEN(NULL, "AC97CLK", AC97, 1, 1, 0),
+        PXA27X_PBUS_CKEN(NULL, "AC97CONFCLK", AC97CONF, 1, 1, 0),
+        PXA27X_PBUS_CKEN(NULL, "OSTIMER0", OSTIMER, 1, 96, 0),
+
+        PXA27X_CKEN_1RATE("pxa27x-keypad", NULL, KEYPAD,
+                          pxa27x_32Mhz_bus_parents, 0),
+        PXA27X_CKEN_1RATE(NULL, "IMCLK", IM, pxa27x_sbus_parents, 0),
+        PXA27X_CKEN_1RATE("pxa2xx-fb", NULL, LCD, pxa27x_lcd_bus_parents, 0),
+        PXA27X_CKEN_1RATE("pxa27x-camera.0", NULL, CAMERA,
+                          pxa27x_lcd_bus_parents, 0),
+        PXA27X_CKEN_1RATE_AO("pxa2xx-pcmcia", NULL, MEMC,
+                             pxa27x_membus_parents, 0),
+
+};
+
+static unsigned long clk_pxa27x_cpll_get_rate(struct clk_hw *hw,
+        unsigned long parent_rate)
+{
+        unsigned long clkcfg;
+        unsigned int t, ht;
+        unsigned int l, L, n2, N;
+        unsigned long ccsr = CCSR;
+
+        asm("mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg));
+        t  = clkcfg & (1 << 0);
+        ht = clkcfg & (1 << 2);
+
+        l  = ccsr & CCSR_L_MASK;
+        n2 = (ccsr & CCSR_N2_MASK) >> CCSR_N2_SHIFT;
+        L  = l * parent_rate;
+        N  = (L * n2) / 2;
+
+        return t ? N : L;
+}
+PARENTS(clk_pxa27x_cpll) = { "osc_13mhz" };
+RATE_RO_OPS(clk_pxa27x_cpll, "cpll");
+
+static unsigned long clk_pxa27x_lcd_base_get_rate(struct clk_hw *hw,
+                                                  unsigned long parent_rate)
+{
+        unsigned int l, osc_forced;
+        unsigned long ccsr = CCSR;
+        unsigned long cccr = CCCR;
+
+        l  = ccsr & CCSR_L_MASK;
+        osc_forced = ccsr & (1 << CCCR_CPDIS_BIT);
+        if (osc_forced) {
+                if (cccr & (1 << CCCR_LCD_26_BIT))
+                        return parent_rate * 2;
+                else
+                        return parent_rate;
+        }
+
+        if (l <= 7)
+                return parent_rate;
+        if (l <= 16)
+                return parent_rate / 2;
+        return parent_rate / 4;
+}
+
+static u8 clk_pxa27x_lcd_base_get_parent(struct clk_hw *hw)
+{
+        unsigned int osc_forced;
+        unsigned long ccsr = CCSR;
+
+        osc_forced = ccsr & (1 << CCCR_CPDIS_BIT);
+        if (osc_forced)
+                return PXA_LCD_13Mhz;
+        else
+                return PXA_LCD_RUN;
+}
+
+PARENTS(clk_pxa27x_lcd_base) = { "osc_13mhz", "run" };
+MUX_RO_RATE_RO_OPS(clk_pxa27x_lcd_base, "lcd_base");
+
+static void __init pxa27x_register_plls(void)
+{
+        clk_register_fixed_rate(NULL, "osc_13mhz", NULL,
+                                CLK_GET_RATE_NOCACHE | CLK_IS_ROOT,
+                                13 * MHz);
+        clk_register_fixed_rate(NULL, "osc_32_768khz", NULL,
+                                CLK_GET_RATE_NOCACHE | CLK_IS_ROOT,
+                                32768 * KHz);
+        clk_register_fixed_rate(NULL, "clk_dummy", NULL, CLK_IS_ROOT, 0);
+        clk_register_fixed_factor(NULL, "ppll_312mhz", "osc_13mhz", 0, 24, 1);
+}
+
+static unsigned long clk_pxa27x_core_get_rate(struct clk_hw *hw,
+                                              unsigned long parent_rate)
+{
+        unsigned long clkcfg;
+        unsigned int t, ht, b, osc_forced;
+        unsigned long ccsr = CCSR;
+
+        osc_forced = ccsr & (1 << CCCR_CPDIS_BIT);
+        asm("mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg));
+        t  = clkcfg & (1 << 0);
+        ht = clkcfg & (1 << 2);
+        b  = clkcfg & (1 << 3);
+
+        if (osc_forced)
+                return parent_rate;
+        if (ht)
+                return parent_rate / 2;
+        else
+                return parent_rate;
+}
+
+static u8 clk_pxa27x_core_get_parent(struct clk_hw *hw)
+{
+        unsigned long clkcfg;
+        unsigned int t, ht, b, osc_forced;
+        unsigned long ccsr = CCSR;
+
+        osc_forced = ccsr & (1 << CCCR_CPDIS_BIT);
+        if (osc_forced)
+                return PXA_CORE_13Mhz;
+
+        asm("mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg));
+        t  = clkcfg & (1 << 0);
+        ht = clkcfg & (1 << 2);
+        b  = clkcfg & (1 << 3);
+
+        if (ht || t)
+                return PXA_CORE_TURBO;
+        return PXA_CORE_RUN;
+}
+PARENTS(clk_pxa27x_core) = { "osc_13mhz", "run", "cpll" };
+MUX_RO_RATE_RO_OPS(clk_pxa27x_core, "core");
+
+static unsigned long clk_pxa27x_run_get_rate(struct clk_hw *hw,
+                                             unsigned long parent_rate)
+{
+        unsigned long ccsr = CCSR;
+        unsigned int n2 = (ccsr & CCSR_N2_MASK) >> CCSR_N2_SHIFT;
+
+        return (parent_rate / n2) * 2;
+}
+PARENTS(clk_pxa27x_run) = { "cpll" };
+RATE_RO_OPS(clk_pxa27x_run, "run");
+
+static void __init pxa27x_register_core(void)
+{
+        clk_register_clk_pxa27x_cpll();
+        clk_register_clk_pxa27x_run();
+
+        clkdev_pxa_register(CLK_CORE, "core", NULL,
+                            clk_register_clk_pxa27x_core());
+}
+
+static unsigned long clk_pxa27x_system_bus_get_rate(struct clk_hw *hw,
+                                                    unsigned long parent_rate)
+{
+        unsigned long clkcfg;
+        unsigned int b, osc_forced;
+        unsigned long ccsr = CCSR;
+
+        osc_forced = ccsr & (1 << CCCR_CPDIS_BIT);
+        asm("mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg));
+        b  = clkcfg & (1 << 3);
+
+        if (osc_forced)
+                return parent_rate;
+        if (b)
+                return parent_rate / 2;
+        else
+                return parent_rate;
+}
+
+static u8 clk_pxa27x_system_bus_get_parent(struct clk_hw *hw)
+{
+        unsigned int osc_forced;
+        unsigned long ccsr = CCSR;
+
+        osc_forced = ccsr & (1 << CCCR_CPDIS_BIT);
+        if (osc_forced)
+                return PXA_BUS_13Mhz;
+        else
+                return PXA_BUS_RUN;
+}
+
+PARENTS(clk_pxa27x_system_bus) = { "osc_13mhz", "run" };
+MUX_RO_RATE_RO_OPS(clk_pxa27x_system_bus, "system_bus");
+
+static unsigned long clk_pxa27x_memory_get_rate(struct clk_hw *hw,
+                                                unsigned long parent_rate)
+{
+        unsigned int a, l, osc_forced;
+        unsigned long cccr = CCCR;
+        unsigned long ccsr = CCSR;
+
+        osc_forced = ccsr & (1 << CCCR_CPDIS_BIT);
+        a = cccr & CCCR_A_BIT;
+        l  = ccsr & CCSR_L_MASK;
+
+        if (osc_forced || a)
+                return parent_rate;
+        if (l <= 10)
+                return parent_rate;
+        if (l <= 20)
+                return parent_rate / 2;
+        return parent_rate / 4;
+}
+
+static u8 clk_pxa27x_memory_get_parent(struct clk_hw *hw)
+{
+        unsigned int osc_forced, a;
+        unsigned long cccr = CCCR;
+        unsigned long ccsr = CCSR;
+
+        osc_forced = ccsr & (1 << CCCR_CPDIS_BIT);
+        a = cccr & CCCR_A_BIT;
+        if (osc_forced)
+                return PXA_MEM_13Mhz;
+        if (a)
+                return PXA_MEM_SYSTEM_BUS;
+        else
+                return PXA_MEM_RUN;
+}
+
+PARENTS(clk_pxa27x_memory) = { "osc_13mhz", "system_bus", "run" };
+MUX_RO_RATE_RO_OPS(clk_pxa27x_memory, "memory");
+
+static void __init pxa27x_base_clocks_init(void)
+{
+        pxa27x_register_plls();
+        pxa27x_register_core();
+        clk_register_clk_pxa27x_system_bus();
+        clk_register_clk_pxa27x_memory();
+        clk_register_clk_pxa27x_lcd_base();
+}
+
+static int __init pxa27x_clocks_init(void)
+{
+        pxa27x_base_clocks_init();
+        return clk_pxa_cken_init(pxa27x_clocks, ARRAY_SIZE(pxa27x_clocks));
+}
+postcore_initcall(pxa27x_clocks_init);