--- /dev/null
+/*
+ * r8a7791 clock framework support
+ *
+ * Copyright (C) 2013 Renesas Electronics Corporation
+ * Copyright (C) 2013 Renesas Solutions Corp.
+ * Copyright (C) 2013 Magnus Damm
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/sh_clk.h>
+#include <linux/clkdev.h>
+#include <mach/clock.h>
+#include <mach/common.h>
+
+/*
+ * MD EXTAL PLL0 PLL1 PLL3
+ * 14 13 19 (MHz) *1 *1
+ *---------------------------------------------------
+ * 0 0 0 15 x 1 x172/2 x208/2 x106
+ * 0 0 1 15 x 1 x172/2 x208/2 x88
+ * 0 1 0 20 x 1 x130/2 x156/2 x80
+ * 0 1 1 20 x 1 x130/2 x156/2 x66
+ * 1 0 0 26 / 2 x200/2 x240/2 x122
+ * 1 0 1 26 / 2 x200/2 x240/2 x102
+ * 1 1 0 30 / 2 x172/2 x208/2 x106
+ * 1 1 1 30 / 2 x172/2 x208/2 x88
+ *
+ * *1 : Table 7.6 indicates VCO ouput (PLLx = VCO/2)
+ * see "p1 / 2" on R8A7791_CLOCK_ROOT() below
+ */
+
+#define MD(nr) (1 << nr)
+
+#define CPG_BASE 0xe6150000
+#define CPG_LEN 0x1000
+
+#define SMSTPCR1 0xE6150134
+#define SMSTPCR2 0xe6150138
+#define SMSTPCR3 0xE615013C
+#define SMSTPCR5 0xE6150144
+#define SMSTPCR7 0xe615014c
+#define SMSTPCR8 0xE6150990
+#define SMSTPCR9 0xE6150994
+#define SMSTPCR10 0xE6150998
+
+#define MODEMR 0xE6160060
+#define SDCKCR 0xE6150074
+#define SD2CKCR 0xE6150078
+#define SD3CKCR 0xE615007C
+#define MMC0CKCR 0xE6150240
+#define MMC1CKCR 0xE6150244
+#define SSPCKCR 0xE6150248
+#define SSPRSCKCR 0xE615024C
+
+static struct clk_mapping cpg_mapping = {
+ .phys = CPG_BASE,
+ .len = CPG_LEN,
+};
+
+static struct clk extal_clk = {
+ /* .rate will be updated on r8a7791_clock_init() */
+ .mapping = &cpg_mapping,
+};
+
+static struct sh_clk_ops followparent_clk_ops = {
+ .recalc = followparent_recalc,
+};
+
+static struct clk main_clk = {
+ /* .parent will be set r8a73a4_clock_init */
+ .ops = &followparent_clk_ops,
+};
+
+/*
+ * clock ratio of these clock will be updated
+ * on r8a7791_clock_init()
+ */
+SH_FIXED_RATIO_CLK_SET(pll1_clk, main_clk, 1, 1);
+SH_FIXED_RATIO_CLK_SET(pll3_clk, main_clk, 1, 1);
+
+/* fixed ratio clock */
+SH_FIXED_RATIO_CLK_SET(extal_div2_clk, extal_clk, 1, 2);
+SH_FIXED_RATIO_CLK_SET(cp_clk, extal_clk, 1, 2);
+
+SH_FIXED_RATIO_CLK_SET(pll1_div2_clk, pll1_clk, 1, 2);
+SH_FIXED_RATIO_CLK_SET(hp_clk, pll1_clk, 1, 12);
+SH_FIXED_RATIO_CLK_SET(p_clk, pll1_clk, 1, 24);
+
+SH_FIXED_RATIO_CLK_SET(mp_clk, pll1_div2_clk, 1, 15);
+
+static struct clk *main_clks[] = {
+ &extal_clk,
+ &extal_div2_clk,
+ &main_clk,
+ &pll1_clk,
+ &pll1_div2_clk,
+ &pll3_clk,
+ &hp_clk,
+ &p_clk,
+ &mp_clk,
+ &cp_clk,
+};
+
+/* MSTP */
+enum {
+ MSTP721, MSTP720,
+/* MSTP216, MSTP207, MSTP206, MSTP204, MSTP203, MSTP202,*/
+ MSTP_NR
+};
+
+static struct clk mstp_clks[MSTP_NR] = {
+ [MSTP721] = SH_CLK_MSTP32(&p_clk, SMSTPCR7, 21, 0), /* SCIF0 */
+ [MSTP720] = SH_CLK_MSTP32(&p_clk, SMSTPCR7, 20, 0), /* SCIF1 */
+};
+
+static struct clk_lookup lookups[] = {
+
+ /* main clocks */
+ CLKDEV_CON_ID("extal", &extal_clk),
+ CLKDEV_CON_ID("extal_div2", &extal_div2_clk),
+ CLKDEV_CON_ID("main", &main_clk),
+ CLKDEV_CON_ID("pll1", &pll1_clk),
+ CLKDEV_CON_ID("pll1_div2", &pll1_div2_clk),
+ CLKDEV_CON_ID("pll3", &pll3_clk),
+ CLKDEV_CON_ID("hp", &hp_clk),
+ CLKDEV_CON_ID("p", &p_clk),
+ CLKDEV_CON_ID("mp", &mp_clk),
+ CLKDEV_CON_ID("cp", &cp_clk),
+ CLKDEV_CON_ID("peripheral_clk", &hp_clk),
+};
+
+#define R8A7791_CLOCK_ROOT(e, m, p0, p1, p30, p31) \
+ extal_clk.rate = e * 1000 * 1000; \
+ main_clk.parent = m; \
+ SH_CLK_SET_RATIO(&pll1_clk_ratio, p1 / 2, 1); \
+ if (mode & MD(19)) \
+ SH_CLK_SET_RATIO(&pll3_clk_ratio, p31, 1); \
+ else \
+ SH_CLK_SET_RATIO(&pll3_clk_ratio, p30, 1)
+
+
+void __init r8a7791_clock_init(void)
+{
+ void __iomem *modemr = ioremap_nocache(MODEMR, PAGE_SIZE);
+ u32 mode;
+ int k, ret = 0;
+
+ BUG_ON(!modemr);
+ mode = ioread32(modemr);
+ iounmap(modemr);
+
+ switch (mode & (MD(14) | MD(13))) {
+ case 0:
+ R8A7791_CLOCK_ROOT(15, &extal_clk, 172, 208, 106, 88);
+ break;
+ case MD(13):
+ R8A7791_CLOCK_ROOT(20, &extal_clk, 130, 156, 80, 66);
+ break;
+ case MD(14):
+ R8A7791_CLOCK_ROOT(26, &extal_div2_clk, 200, 240, 122, 102);
+ break;
+ case MD(13) | MD(14):
+ R8A7791_CLOCK_ROOT(30, &extal_div2_clk, 172, 208, 106, 88);
+ break;
+ }
+
+ for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++)
+ ret = clk_register(main_clks[k]);
+
+ if (!ret)
+ ret = sh_clk_mstp_register(mstp_clks, MSTP_NR);
+
+ clkdev_add_table(lookups, ARRAY_SIZE(lookups));
+
+ if (!ret)
+ shmobile_clk_init();
+ else
+ goto epanic;
+
+ return;
+
+epanic:
+ panic("failed to setup r8a7791 clocks\n");
+}
projects / karo-tx-linux.git / commitdiff