4 * DSP-BIOS Bridge driver support functions for TI OMAP processors.
6 * Clock and Timer services.
8 * Copyright (C) 2005-2006 Texas Instruments, Inc.
10 * This package is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
14 * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
16 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
19 #define L4_34XX_BASE 0x48000000
21 #include <linux/types.h>
23 /* ----------------------------------- Host OS */
24 #include <dspbridge/host_os.h>
25 #include <plat/dmtimer.h>
26 #include <linux/platform_data/asoc-ti-mcbsp.h>
28 /* ----------------------------------- DSP/BIOS Bridge */
29 #include <dspbridge/dbdefs.h>
30 #include <dspbridge/drv.h>
31 #include <dspbridge/dev.h>
34 /* ----------------------------------- This */
35 #include <dspbridge/clk.h>
37 /* ----------------------------------- Defines, Data Structures, Typedefs */
39 #define OMAP_SSI_OFFSET 0x58000
40 #define OMAP_SSI_SIZE 0x1000
41 #define OMAP_SSI_SYSCONFIG_OFFSET 0x10
43 #define SSI_AUTOIDLE (1 << 0)
44 #define SSI_SIDLE_SMARTIDLE (2 << 3)
45 #define SSI_MIDLE_NOIDLE (1 << 12)
47 /* Clk types requested by the dsp */
54 /* Bridge GPT id (1 - 4), DM Timer id (5 - 8) */
55 #define DMT_ID(id) ((id) + 4)
56 #define DM_TIMER_CLOCKS 4
58 /* Bridge MCBSP id (6 - 10), OMAP Mcbsp id (0 - 4) */
59 #define MCBSP_ID(id) ((id) - 6)
61 static struct omap_dm_timer *timer[4];
71 static struct dsp_ssi ssi;
73 static u32 dsp_clocks;
75 static inline u32 is_dsp_clk_active(u32 clk, u8 id)
77 return clk & (1 << id);
80 static inline void set_dsp_clk_active(u32 *clk, u8 id)
85 static inline void set_dsp_clk_inactive(u32 *clk, u8 id)
90 static s8 get_clk_type(u8 id)
94 if (id == DSP_CLK_IVA2)
96 else if (id <= DSP_CLK_GPT8)
98 else if (id == DSP_CLK_WDT3)
100 else if (id <= DSP_CLK_MCBSP5)
102 else if (id == DSP_CLK_SSI)
111 * ======== dsp_clk_exit ========
113 * Cleanup CLK module.
115 void dsp_clk_exit(void)
119 dsp_clock_disable_all(dsp_clocks);
121 for (i = 0; i < DM_TIMER_CLOCKS; i++)
122 omap_dm_timer_free(timer[i]);
125 clk_put(ssi.sst_fck);
126 clk_put(ssi.ssr_fck);
131 * ======== dsp_clk_init ========
133 * Initialize CLK module.
135 void dsp_clk_init(void)
137 static struct platform_device dspbridge_device;
140 dspbridge_device.dev.bus = &platform_bus_type;
142 for (i = 0, id = 5; i < DM_TIMER_CLOCKS; i++, id++)
143 timer[i] = omap_dm_timer_request_specific(id);
145 iva2_clk = clk_get(&dspbridge_device.dev, "iva2_ck");
146 if (IS_ERR(iva2_clk))
147 dev_err(bridge, "failed to get iva2 clock %p\n", iva2_clk);
149 ssi.sst_fck = clk_get(&dspbridge_device.dev, "ssi_sst_fck");
150 ssi.ssr_fck = clk_get(&dspbridge_device.dev, "ssi_ssr_fck");
151 ssi.ick = clk_get(&dspbridge_device.dev, "ssi_ick");
153 if (IS_ERR(ssi.sst_fck) || IS_ERR(ssi.ssr_fck) || IS_ERR(ssi.ick))
154 dev_err(bridge, "failed to get ssi: sst %p, ssr %p, ick %p\n",
155 ssi.sst_fck, ssi.ssr_fck, ssi.ick);
159 * dsp_gpt_wait_overflow - set gpt overflow and wait for fixed timeout
160 * @clk_id: GP Timer clock id.
161 * @load: Overflow value.
163 * Sets an overflow interrupt for the desired GPT waiting for a timeout
164 * of 5 msecs for the interrupt to occur.
166 void dsp_gpt_wait_overflow(short int clk_id, unsigned int load)
168 struct omap_dm_timer *gpt = timer[clk_id - 1];
169 unsigned long timeout;
174 /* Enable overflow interrupt */
175 omap_dm_timer_set_int_enable(gpt, OMAP_TIMER_INT_OVERFLOW);
178 * Set counter value to overflow counter after
179 * one tick and start timer.
181 omap_dm_timer_set_load_start(gpt, 0, load);
183 /* Wait 80us for timer to overflow */
186 timeout = msecs_to_jiffies(5);
187 /* Check interrupt status and wait for interrupt */
188 while (!(omap_dm_timer_read_status(gpt) & OMAP_TIMER_INT_OVERFLOW)) {
189 if (time_is_after_jiffies(timeout)) {
190 pr_err("%s: GPTimer interrupt failed\n", __func__);
197 * ======== dsp_clk_enable ========
202 int dsp_clk_enable(enum dsp_clk_id clk_id)
206 if (is_dsp_clk_active(dsp_clocks, clk_id)) {
207 dev_err(bridge, "WARN: clock id %d already enabled\n", clk_id);
211 switch (get_clk_type(clk_id)) {
213 clk_enable(iva2_clk);
216 status = omap_dm_timer_start(timer[clk_id - 1]);
218 #ifdef CONFIG_OMAP_MCBSP
220 omap_mcbsp_request(MCBSP_ID(clk_id));
221 omap2_mcbsp_set_clks_src(MCBSP_ID(clk_id), MCBSP_CLKS_PAD_SRC);
225 dev_err(bridge, "ERROR: DSP requested to enable WDT3 clk\n");
228 clk_enable(ssi.sst_fck);
229 clk_enable(ssi.ssr_fck);
233 * The SSI module need to configured not to have the Forced
234 * idle for master interface. If it is set to forced idle,
235 * the SSI module is transitioning to standby thereby causing
236 * the client in the DSP hang waiting for the SSI module to
237 * be active after enabling the clocks
239 ssi_clk_prepare(true);
242 dev_err(bridge, "Invalid clock id for enable\n");
247 set_dsp_clk_active(&dsp_clocks, clk_id);
254 * dsp_clock_enable_all - Enable clocks used by the DSP
255 * @dev_context Driver's device context strucure
257 * This function enables all the peripheral clocks that were requested by DSP.
259 u32 dsp_clock_enable_all(u32 dsp_per_clocks)
264 for (clk_id = 0; clk_id < DSP_CLK_NOT_DEFINED; clk_id++) {
265 if (is_dsp_clk_active(dsp_per_clocks, clk_id))
266 status = dsp_clk_enable(clk_id);
273 * ======== dsp_clk_disable ========
278 int dsp_clk_disable(enum dsp_clk_id clk_id)
282 if (!is_dsp_clk_active(dsp_clocks, clk_id)) {
283 dev_err(bridge, "ERR: clock id %d already disabled\n", clk_id);
287 switch (get_clk_type(clk_id)) {
289 clk_disable(iva2_clk);
292 status = omap_dm_timer_stop(timer[clk_id - 1]);
294 #ifdef CONFIG_OMAP_MCBSP
296 omap2_mcbsp_set_clks_src(MCBSP_ID(clk_id), MCBSP_CLKS_PRCM_SRC);
297 omap_mcbsp_free(MCBSP_ID(clk_id));
301 dev_err(bridge, "ERROR: DSP requested to disable WDT3 clk\n");
304 ssi_clk_prepare(false);
305 ssi_clk_prepare(false);
306 clk_disable(ssi.sst_fck);
307 clk_disable(ssi.ssr_fck);
308 clk_disable(ssi.ick);
311 dev_err(bridge, "Invalid clock id for disable\n");
316 set_dsp_clk_inactive(&dsp_clocks, clk_id);
323 * dsp_clock_disable_all - Disable all active clocks
324 * @dev_context Driver's device context structure
326 * This function disables all the peripheral clocks that were enabled by DSP.
327 * It is meant to be called only when DSP is entering hibernation or when DSP
330 u32 dsp_clock_disable_all(u32 dsp_per_clocks)
335 for (clk_id = 0; clk_id < DSP_CLK_NOT_DEFINED; clk_id++) {
336 if (is_dsp_clk_active(dsp_per_clocks, clk_id))
337 status = dsp_clk_disable(clk_id);
343 u32 dsp_clk_get_iva2_rate(void)
347 clk_speed_khz = clk_get_rate(iva2_clk);
348 clk_speed_khz /= 1000;
349 dev_dbg(bridge, "%s: clk speed Khz = %d\n", __func__, clk_speed_khz);
351 return clk_speed_khz;
354 void ssi_clk_prepare(bool FLAG)
356 void __iomem *ssi_base;
359 ssi_base = ioremap(L4_34XX_BASE + OMAP_SSI_OFFSET, OMAP_SSI_SIZE);
361 pr_err("%s: error, SSI not configured\n", __func__);
366 /* Set Autoidle, SIDLEMode to smart idle, and MIDLEmode to
369 value = SSI_AUTOIDLE | SSI_SIDLE_SMARTIDLE | SSI_MIDLE_NOIDLE;
371 /* Set Autoidle, SIDLEMode to forced idle, and MIDLEmode to
374 value = SSI_AUTOIDLE;
377 __raw_writel(value, ssi_base + OMAP_SSI_SYSCONFIG_OFFSET);