MXC: add basic MXC91231 support

Signed-off-by: Dmitriy Taychenachev <dimichxp@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 642 insertions, 0 deletions

diff --git a/arch/arm/mach-mxc91231/clock.c b/arch/arm/mach-mxc91231/clock.c
new file mode 100644
index 000000000000..ecfa37fef8ad
--- /dev/null
+++ b/arch/arm/mach-mxc91231/clock.c
@@ -0,0 +1,642 @@
+#include <linux/clk.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+
+#include <mach/clock.h>
+#include <mach/hardware.h>
+#include <mach/common.h>
+
+#include <asm/clkdev.h>
+#include <asm/bug.h>
+#include <asm/div64.h>
+
+#include "crm_regs.h"
+
+#define CRM_SMALL_DIVIDER(base, name) \
+        crm_small_divider(base, \
+                          base ## _ ## name ## _OFFSET, \
+                          base ## _ ## name ## _MASK)
+#define CRM_1DIVIDER(base, name) \
+        crm_divider(base, \
+                    base ## _ ## name ## _OFFSET, \
+                    base ## _ ## name ## _MASK, 1)
+#define CRM_16DIVIDER(base, name) \
+        crm_divider(base, \
+                    base ## _ ## name ## _OFFSET, \
+                    base ## _ ## name ## _MASK, 16)
+
+static u32 crm_small_divider(void __iomem *reg, u8 offset, u32 mask)
+{
+        static const u32 crm_small_dividers[] = {
+                2, 3, 4, 5, 6, 8, 10, 12
+        };
+        u8 idx;
+
+        idx = (__raw_readl(reg) & mask) >> offset;
+        if (idx > 7)
+                return 1;
+
+        return crm_small_dividers[idx];
+}
+
+static u32 crm_divider(void __iomem *reg, u8 offset, u32 mask, u32 z)
+{
+        u32 div;
+        div = (__raw_readl(reg) & mask) >> offset;
+        return div ? div : z;
+}
+
+static int _clk_1bit_enable(struct clk *clk)
+{
+        u32 reg;
+
+        reg = __raw_readl(clk->enable_reg);
+        reg |= 1 << clk->enable_shift;
+        __raw_writel(reg, clk->enable_reg);
+
+        return 0;
+}
+
+static void _clk_1bit_disable(struct clk *clk)
+{
+        u32 reg;
+
+        reg = __raw_readl(clk->enable_reg);
+        reg &= ~(1 << clk->enable_shift);
+        __raw_writel(reg, clk->enable_reg);
+}
+
+static int _clk_3bit_enable(struct clk *clk)
+{
+        u32 reg;
+
+        reg = __raw_readl(clk->enable_reg);
+        reg |= 0x7 << clk->enable_shift;
+        __raw_writel(reg, clk->enable_reg);
+
+        return 0;
+}
+
+static void _clk_3bit_disable(struct clk *clk)
+{
+        u32 reg;
+
+        reg = __raw_readl(clk->enable_reg);
+        reg &= ~(0x7 << clk->enable_shift);
+        __raw_writel(reg, clk->enable_reg);
+}
+
+static unsigned long ckih_rate;
+
+static unsigned long clk_ckih_get_rate(struct clk *clk)
+{
+        return ckih_rate;
+}
+
+static struct clk ckih_clk = {
+        .get_rate = clk_ckih_get_rate,
+};
+
+static unsigned long clk_ckih_x2_get_rate(struct clk *clk)
+{
+        return 2 * clk_get_rate(clk->parent);
+}
+
+static struct clk ckih_x2_clk = {
+        .parent = &ckih_clk,
+        .get_rate = clk_ckih_x2_get_rate,
+};
+
+static unsigned long clk_ckil_get_rate(struct clk *clk)
+{
+        return CKIL_CLK_FREQ;
+}
+
+static struct clk ckil_clk = {
+        .get_rate = clk_ckil_get_rate,
+};
+
+/* plls stuff */
+static struct clk mcu_pll_clk;
+static struct clk dsp_pll_clk;
+static struct clk usb_pll_clk;
+
+static struct clk *pll_clk(u8 sel)
+{
+        switch (sel) {
+        case 0:
+                return &mcu_pll_clk;
+        case 1:
+                return &dsp_pll_clk;
+        case 2:
+                return &usb_pll_clk;
+        }
+        BUG();
+}
+
+static void __iomem *pll_base(struct clk *clk)
+{
+        if (clk == &mcu_pll_clk)
+                return MXC_PLL0_BASE;
+        else if (clk == &dsp_pll_clk)
+                return MXC_PLL1_BASE;
+        else if (clk == &usb_pll_clk)
+                return MXC_PLL2_BASE;
+        BUG();
+}
+
+static unsigned long clk_pll_get_rate(struct clk *clk)
+{
+        const void __iomem *pllbase;
+        unsigned long dp_op, dp_mfd, dp_mfn, pll_hfsm, ref_clk, mfi;
+        long mfn, mfn_abs, mfd, pdf;
+        s64 temp;
+        pllbase = pll_base(clk);
+
+        pll_hfsm = __raw_readl(pllbase + MXC_PLL_DP_CTL) & MXC_PLL_DP_CTL_HFSM;
+        if (pll_hfsm == 0) {
+                dp_op = __raw_readl(pllbase + MXC_PLL_DP_OP);
+                dp_mfd = __raw_readl(pllbase + MXC_PLL_DP_MFD);
+                dp_mfn = __raw_readl(pllbase + MXC_PLL_DP_MFN);
+        } else {
+                dp_op = __raw_readl(pllbase + MXC_PLL_DP_HFS_OP);
+                dp_mfd = __raw_readl(pllbase + MXC_PLL_DP_HFS_MFD);
+                dp_mfn = __raw_readl(pllbase + MXC_PLL_DP_HFS_MFN);
+        }
+
+        pdf = dp_op & MXC_PLL_DP_OP_PDF_MASK;
+        mfi = (dp_op >> MXC_PLL_DP_OP_MFI_OFFSET) & MXC_PLL_DP_OP_PDF_MASK;
+        mfi = (mfi <= 5) ? 5 : mfi;
+        mfd = dp_mfd & MXC_PLL_DP_MFD_MASK;
+        mfn = dp_mfn & MXC_PLL_DP_MFN_MASK;
+        mfn = (mfn <= 0x4000000) ? mfn : (mfn - 0x10000000);
+
+        if (mfn < 0)
+                mfn_abs = -mfn;
+        else
+                mfn_abs = mfn;
+
+/* XXX: actually this asumes that ckih is fed to pll, but spec says
+ * that ckih_x2 is also possible. need to check this out.
+ */
+        ref_clk = clk_get_rate(&ckih_clk);
+
+        ref_clk *= 2;
+        ref_clk /= pdf + 1;
+
+        temp = (u64) ref_clk * mfn_abs;
+        do_div(temp, mfd);
+        if (mfn < 0)
+                temp = -temp;
+        temp += ref_clk * mfi;
+
+        return temp;
+}
+
+static int clk_pll_enable(struct clk *clk)
+{
+        void __iomem *ctl;
+        u32 reg;
+
+        ctl = pll_base(clk);
+        reg = __raw_readl(ctl);
+        reg |= (MXC_PLL_DP_CTL_RST | MXC_PLL_DP_CTL_UPEN);
+        __raw_writel(reg, ctl);
+        do {
+                reg = __raw_readl(ctl);
+        } while ((reg & MXC_PLL_DP_CTL_LRF) != MXC_PLL_DP_CTL_LRF);
+        return 0;
+}
+
+static void clk_pll_disable(struct clk *clk)
+{
+        void __iomem *ctl;
+        u32 reg;
+
+        ctl = pll_base(clk);
+        reg = __raw_readl(ctl);
+        reg &= ~(MXC_PLL_DP_CTL_RST | MXC_PLL_DP_CTL_UPEN);
+        __raw_writel(reg, ctl);
+}
+
+static struct clk mcu_pll_clk = {
+        .parent = &ckih_clk,
+        .get_rate = clk_pll_get_rate,
+        .enable = clk_pll_enable,
+        .disable = clk_pll_disable,
+};
+
+static struct clk dsp_pll_clk = {
+        .parent = &ckih_clk,
+        .get_rate = clk_pll_get_rate,
+        .enable = clk_pll_enable,
+        .disable = clk_pll_disable,
+};
+
+static struct clk usb_pll_clk = {
+        .parent = &ckih_clk,
+        .get_rate = clk_pll_get_rate,
+        .enable = clk_pll_enable,
+        .disable = clk_pll_disable,
+};
+/* plls stuff end */
+
+/* ap_ref_clk stuff */
+static struct clk ap_ref_clk;
+
+static unsigned long clk_ap_ref_get_rate(struct clk *clk)
+{
+        u32 ascsr, acsr;
+        u8 ap_pat_ref_div_2, ap_isel, acs, ads;
+
+        ascsr = __raw_readl(MXC_CRMAP_ASCSR);
+        acsr = __raw_readl(MXC_CRMAP_ACSR);
+
+        /* 0 for ckih, 1 for ckih*2 */
+        ap_isel = ascsr & MXC_CRMAP_ASCSR_APISEL;
+        /* reg divider */
+        ap_pat_ref_div_2 = (ascsr >> MXC_CRMAP_ASCSR_AP_PATDIV2_OFFSET) & 0x1;
+        /* undocumented, 1 for disabling divider */
+        ads = (acsr >> MXC_CRMAP_ACSR_ADS_OFFSET) & 0x1;
+        /* 0 for pat_ref, 1 for divider out */
+        acs = acsr & MXC_CRMAP_ACSR_ACS;
+
+        if (acs & !ads)
+                /* use divided clock */
+                return clk_get_rate(clk->parent) / (ap_pat_ref_div_2 ? 2 : 1);
+
+        return clk_get_rate(clk->parent) * (ap_isel ? 2 : 1);
+}
+
+static struct clk ap_ref_clk = {
+        .parent = &ckih_clk,
+        .get_rate = clk_ap_ref_get_rate,
+};
+/* ap_ref_clk stuff end */
+
+/* ap_pre_dfs_clk stuff */
+static struct clk ap_pre_dfs_clk;
+
+static unsigned long clk_ap_pre_dfs_get_rate(struct clk *clk)
+{
+        u32 acsr, ascsr;
+
+        acsr = __raw_readl(MXC_CRMAP_ACSR);
+        ascsr = __raw_readl(MXC_CRMAP_ASCSR);
+
+        if (acsr & MXC_CRMAP_ACSR_ACS) {
+                u8 sel;
+                sel = (ascsr & MXC_CRMAP_ASCSR_APSEL_MASK) >>
+                        MXC_CRMAP_ASCSR_APSEL_OFFSET;
+                return clk_get_rate(pll_clk(sel)) /
+                        CRM_SMALL_DIVIDER(MXC_CRMAP_ACDR, ARMDIV);
+        }
+        return clk_get_rate(&ap_ref_clk);
+}
+
+static struct clk ap_pre_dfs_clk = {
+        .get_rate = clk_ap_pre_dfs_get_rate,
+};
+/* ap_pre_dfs_clk stuff end */
+
+/* usb_clk stuff */
+static struct clk usb_clk;
+
+static struct clk *clk_usb_parent(struct clk *clk)
+{
+        u32 acsr, ascsr;
+
+        acsr = __raw_readl(MXC_CRMAP_ACSR);
+        ascsr = __raw_readl(MXC_CRMAP_ASCSR);
+
+        if (acsr & MXC_CRMAP_ACSR_ACS) {
+                u8 sel;
+                sel = (ascsr & MXC_CRMAP_ASCSR_USBSEL_MASK) >>
+                        MXC_CRMAP_ASCSR_USBSEL_OFFSET;
+                return pll_clk(sel);
+        }
+        return &ap_ref_clk;
+}
+
+static unsigned long clk_usb_get_rate(struct clk *clk)
+{
+        return clk_get_rate(clk->parent) /
+                CRM_SMALL_DIVIDER(MXC_CRMAP_ACDER2, USBDIV);
+}
+
+static struct clk usb_clk = {
+        .enable_reg = MXC_CRMAP_ACDER2,
+        .enable_shift = MXC_CRMAP_ACDER2_USBEN_OFFSET,
+        .get_rate = clk_usb_get_rate,
+        .enable = _clk_1bit_enable,
+        .disable = _clk_1bit_disable,
+};
+/* usb_clk stuff end */
+
+static unsigned long clk_ipg_get_rate(struct clk *clk)
+{
+        return clk_get_rate(clk->parent) / CRM_16DIVIDER(MXC_CRMAP_ACDR, IPDIV);
+}
+
+static unsigned long clk_ahb_get_rate(struct clk *clk)
+{
+        return clk_get_rate(clk->parent) /
+                CRM_16DIVIDER(MXC_CRMAP_ACDR, AHBDIV);
+}
+
+static struct clk ipg_clk = {
+        .parent = &ap_pre_dfs_clk,
+        .get_rate = clk_ipg_get_rate,
+};
+
+static struct clk ahb_clk = {
+        .parent = &ap_pre_dfs_clk,
+        .get_rate = clk_ahb_get_rate,
+};
+
+/* perclk_clk stuff */
+static struct clk perclk_clk;
+
+static unsigned long clk_perclk_get_rate(struct clk *clk)
+{
+        u32 acder2;
+
+        acder2 = __raw_readl(MXC_CRMAP_ACDER2);
+        if (acder2 & MXC_CRMAP_ACDER2_BAUD_ISEL_MASK)
+                return 2 * clk_get_rate(clk->parent);
+
+        return clk_get_rate(clk->parent);
+}
+
+static struct clk perclk_clk = {
+        .parent = &ckih_clk,
+        .get_rate = clk_perclk_get_rate,
+};
+/* perclk_clk stuff end */
+
+/* uart_clk stuff */
+static struct clk uart_clk[];
+
+static unsigned long clk_uart_get_rate(struct clk *clk)
+{
+        u32 div;
+
+        switch (clk->id) {
+        case 0:
+        case 1:
+                div = CRM_SMALL_DIVIDER(MXC_CRMAP_ACDER2, BAUDDIV);
+                break;
+        case 2:
+                div = CRM_SMALL_DIVIDER(MXC_CRMAP_APRA, UART3DIV);
+                break;
+        default:
+                BUG();
+        }
+        return clk_get_rate(clk->parent) / div;
+}
+
+static struct clk uart_clk[] = {
+        {
+                .id = 0,
+                .parent = &perclk_clk,
+                .enable_reg = MXC_CRMAP_APRA,
+                .enable_shift = MXC_CRMAP_APRA_UART1EN_OFFSET,
+                .get_rate = clk_uart_get_rate,
+                .enable = _clk_1bit_enable,
+                .disable = _clk_1bit_disable,
+        }, {
+                .id = 1,
+                .parent = &perclk_clk,
+                .enable_reg = MXC_CRMAP_APRA,
+                .enable_shift = MXC_CRMAP_APRA_UART2EN_OFFSET,
+                .get_rate = clk_uart_get_rate,
+                .enable = _clk_1bit_enable,
+                .disable = _clk_1bit_disable,
+        }, {
+                .id = 2,
+                .parent = &perclk_clk,
+                .enable_reg = MXC_CRMAP_APRA,
+                .enable_shift = MXC_CRMAP_APRA_UART3EN_OFFSET,
+                .get_rate = clk_uart_get_rate,
+                .enable = _clk_1bit_enable,
+                .disable = _clk_1bit_disable,
+        },
+};
+/* uart_clk stuff end */
+
+/* sdhc_clk stuff */
+static struct clk nfc_clk;
+
+static unsigned long clk_nfc_get_rate(struct clk *clk)
+{
+        return clk_get_rate(clk->parent) /
+                CRM_1DIVIDER(MXC_CRMAP_ACDER2, NFCDIV);
+}
+
+static struct clk nfc_clk = {
+        .parent = &ahb_clk,
+        .enable_reg = MXC_CRMAP_ACDER2,
+        .enable_shift = MXC_CRMAP_ACDER2_NFCEN_OFFSET,
+        .get_rate = clk_nfc_get_rate,
+        .enable = _clk_1bit_enable,
+        .disable = _clk_1bit_disable,
+};
+/* sdhc_clk stuff end */
+
+/* sdhc_clk stuff */
+static struct clk sdhc_clk[];
+
+static struct clk *clk_sdhc_parent(struct clk *clk)
+{
+        u32 aprb;
+        u8 sel;
+        u32 mask;
+        int offset;
+
+        aprb = __raw_readl(MXC_CRMAP_APRB);
+
+        switch (clk->id) {
+        case 0:
+                mask = MXC_CRMAP_APRB_SDHC1_ISEL_MASK;
+                offset = MXC_CRMAP_APRB_SDHC1_ISEL_OFFSET;
+                break;
+        case 1:
+                mask = MXC_CRMAP_APRB_SDHC2_ISEL_MASK;
+                offset = MXC_CRMAP_APRB_SDHC2_ISEL_OFFSET;
+                break;
+        default:
+                BUG();
+        }
+        sel = (aprb & mask) >> offset;
+
+        switch (sel) {
+        case 0:
+                return &ckih_clk;
+        case 1:
+                return &ckih_x2_clk;
+        }
+        return &usb_clk;
+}
+
+static unsigned long clk_sdhc_get_rate(struct clk *clk)
+{
+        u32 div;
+
+        switch (clk->id) {
+        case 0:
+                div = CRM_SMALL_DIVIDER(MXC_CRMAP_APRB, SDHC1_DIV);
+                break;
+        case 1:
+                div = CRM_SMALL_DIVIDER(MXC_CRMAP_APRB, SDHC2_DIV);
+                break;
+        default:
+                BUG();
+        }
+
+        return clk_get_rate(clk->parent) / div;
+}
+
+static int clk_sdhc_enable(struct clk *clk)
+{
+        u32 amlpmre1, aprb;
+
+        amlpmre1 = __raw_readl(MXC_CRMAP_AMLPMRE1);
+        aprb = __raw_readl(MXC_CRMAP_APRB);
+        switch (clk->id) {
+        case 0:
+                amlpmre1 |= (0x7 << MXC_CRMAP_AMLPMRE1_MLPME4_OFFSET);
+                aprb |= (0x1 << MXC_CRMAP_APRB_SDHC1EN_OFFSET);
+                break;
+        case 1:
+                amlpmre1 |= (0x7 << MXC_CRMAP_AMLPMRE1_MLPME5_OFFSET);
+                aprb |= (0x1 << MXC_CRMAP_APRB_SDHC2EN_OFFSET);
+                break;
+        }
+        __raw_writel(amlpmre1, MXC_CRMAP_AMLPMRE1);
+        __raw_writel(aprb, MXC_CRMAP_APRB);
+        return 0;
+}
+
+static void clk_sdhc_disable(struct clk *clk)
+{
+        u32 amlpmre1, aprb;
+
+        amlpmre1 = __raw_readl(MXC_CRMAP_AMLPMRE1);
+        aprb = __raw_readl(MXC_CRMAP_APRB);
+        switch (clk->id) {
+        case 0:
+                amlpmre1 &= ~(0x7 << MXC_CRMAP_AMLPMRE1_MLPME4_OFFSET);
+                aprb &= ~(0x1 << MXC_CRMAP_APRB_SDHC1EN_OFFSET);
+                break;
+        case 1:
+                amlpmre1 &= ~(0x7 << MXC_CRMAP_AMLPMRE1_MLPME5_OFFSET);
+                aprb &= ~(0x1 << MXC_CRMAP_APRB_SDHC2EN_OFFSET);
+                break;
+        }
+        __raw_writel(amlpmre1, MXC_CRMAP_AMLPMRE1);
+        __raw_writel(aprb, MXC_CRMAP_APRB);
+}
+
+static struct clk sdhc_clk[] = {
+        {
+                .id = 0,
+                .get_rate = clk_sdhc_get_rate,
+                .enable = clk_sdhc_enable,
+                .disable = clk_sdhc_disable,
+        }, {
+                .id = 1,
+                .get_rate = clk_sdhc_get_rate,
+                .enable = clk_sdhc_enable,
+                .disable = clk_sdhc_disable,
+        },
+};
+/* sdhc_clk stuff end */
+
+/* wdog_clk stuff */
+static struct clk wdog_clk[] = {
+        {
+                .id = 0,
+                .parent = &ipg_clk,
+                .enable_reg = MXC_CRMAP_AMLPMRD,
+                .enable_shift = MXC_CRMAP_AMLPMRD_MLPMD7_OFFSET,
+                .enable = _clk_3bit_enable,
+                .disable = _clk_3bit_disable,
+        }, {
+                .id = 1,
+                .parent = &ipg_clk,
+                .enable_reg = MXC_CRMAP_AMLPMRD,
+                .enable_shift = MXC_CRMAP_AMLPMRD_MLPMD3_OFFSET,
+                .enable = _clk_3bit_enable,
+                .disable = _clk_3bit_disable,
+        },
+};
+/* wdog_clk stuff end */
+
+/* gpt_clk stuff */
+static struct clk gpt_clk = {
+        .parent = &ipg_clk,
+        .enable_reg = MXC_CRMAP_AMLPMRC,
+        .enable_shift = MXC_CRMAP_AMLPMRC_MLPMC4_OFFSET,
+        .enable = _clk_3bit_enable,
+        .disable = _clk_3bit_disable,
+};
+/* gpt_clk stuff end */
+
+/* cspi_clk stuff */
+static struct clk cspi_clk[] = {
+        {
+                .id = 0,
+                .parent = &ipg_clk,
+                .enable_reg = MXC_CRMAP_AMLPMRE2,
+                .enable_shift = MXC_CRMAP_AMLPMRE2_MLPME0_OFFSET,
+                .enable = _clk_3bit_enable,
+                .disable = _clk_3bit_disable,
+        }, {
+                .id = 1,
+                .parent = &ipg_clk,
+                .enable_reg = MXC_CRMAP_AMLPMRE1,
+                .enable_shift = MXC_CRMAP_AMLPMRE1_MLPME6_OFFSET,
+                .enable = _clk_3bit_enable,
+                .disable = _clk_3bit_disable,
+        },
+};
+/* cspi_clk stuff end */
+
+#define _REGISTER_CLOCK(d, n, c) \
+        { \
+                .dev_id = d, \
+                .con_id = n, \
+                .clk = &c, \
+        },
+
+static struct clk_lookup lookups[] = {
+        _REGISTER_CLOCK("imx-uart.0", NULL, uart_clk[0])
+        _REGISTER_CLOCK("imx-uart.1", NULL, uart_clk[1])
+        _REGISTER_CLOCK("imx-uart.2", NULL, uart_clk[2])
+        _REGISTER_CLOCK("mxc-mmc.0", NULL, sdhc_clk[0])
+        _REGISTER_CLOCK("mxc-mmc.1", NULL, sdhc_clk[1])
+        _REGISTER_CLOCK("mxc-wdt.0", NULL, wdog_clk[0])
+        _REGISTER_CLOCK("spi_imx.0", NULL, cspi_clk[0])
+        _REGISTER_CLOCK("spi_imx.1", NULL, cspi_clk[1])
+};
+
+int __init mxc91231_clocks_init(unsigned long fref)
+{
+        void __iomem *gpt_base;
+        int i;
+
+        ckih_rate = fref;
+
+        usb_clk.parent = clk_usb_parent(&usb_clk);
+        sdhc_clk[0].parent = clk_sdhc_parent(&sdhc_clk[0]);
+        sdhc_clk[1].parent = clk_sdhc_parent(&sdhc_clk[1]);
+
+        for (i = 0; i < ARRAY_SIZE(lookups); i++)
+                clkdev_add(&lookups[i]);
+
+        gpt_base = MXC91231_IO_ADDRESS(MXC91231_GPT1_BASE_ADDR);
+        mxc_timer_init(&gpt_clk, gpt_base, MXC91231_INT_GPT);
+
+        return 0;
+}